650-1 01
NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 Item No. Item Pay Unit 649.01 Milled -In Audible Roadway Delineators (MIARDs) Linear Foot 649.11 Centerline Audible Roadway Delineators (CARDs) Linear Foot 649.21 Secondary Highway Audible Roadway Delineators (SHARDs) Linear Foot SECTION 650 - TRENCHLESS INSTALLATION OF CASING
650-1 DESCRIPTION. Under this work the Contractor shall furnish and install a casing by trenchless
installation methods in accordance with the contract documents and as directed by the Engineer. T he casing length, type, and size shall be as indicated in the contract documents. Acceptable methods of trenchless installation include Auger Boring, Slurry Boring, Pipe Jacking, Microtunneling, or Horizontal Directional Drilling. Pipe Ramming or Soil Compaction methods will not be allowed. For an installation under a railroad, methods which leave an uncased bore hole t hrough the embankment will not be allowed.
650-1.01 Definitions. The following definitions were obtained from the NCHRP Synthesis 242
Trenchless Installation of Conduits Beneath Roadways.
A.Auger Boring (AB). A technique that forms a bore hole from a drive shaft to a reception shaft by means of a rotating cutting head. Spoil is transported back to the drive shaft by helical -wound auger flights rotating inside a steel casing that is being jacked in place simulta neously. AB may provide limited tracking and steering capability. It does not provide continuous support to the excavation face. AB is typically a 2 -stage process (i.e., casing installation and product pipe installation).
B.Slurry Boring (SB). A technique that forms a bore hole from a drive shaft to a reception shaft by means of a drill bit and drill tubing (stem). A drilling fluid (i.e., bentonite slurry, water, or air pressure) is used to facilitate the drilling process by keeping the drill bi t clean and aiding with spoil removal. It is a 2 -stage process. Typically, an unsupported horizontal hole is produced in the first stage. The pipe is installed in the second stage.
C.Pipe Jacking (PJ). A technique for installing a prefabricated pipe through the ground from a drive shaft to a reception shaft. The pipe is propelled by jacks located in the drive shaft. The jacking force is transmitted through the pipe to the face of the PJ excavation. The e xcavation is accomplished, and the spoil is transported out of the jacking pipe and shaft manually or mechanically. Both the excavation and spoil removal processes require workers to be inside the pipe during the jacking operation.
D.Microtunneling (MT). A remotely controlled, guided pipe -jacking process that provides continuous support to the excavation face. The guidance system usually consists of a laser mounted in the drive shaft communicating a reference line to a target mounted inside the MT machine’ s articulated steering head. The MT process provides ability to control excavation face stability by applying mechanical or fluid pressure to counterbalance the earth and hydrostatic pressures.
E.Horizontal Directional Drilling (HDD). A 2-stage process that consists of drilling a small diameter pilot directional hole along a predetermined path and then developing the pilot hole into a suitable bore hole that will accommodate the desired utility and then pulling the utility into place. T he HDD process provides the ability to track the location of the drill bit and steer it during the drilling process. The vertical profile of the bore hole is typically in the shape of an arc entrapping drilling fluid to form a slurry pathway rather than an open hole. This entrapped slurry provides continuous support to the bore hole.
650-2 01
NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 F. Utility Tunneling (UT). A 2-stage process in which a temporary ground support system is constructed to permit the installation of a utility. The temporary tunnel liner is installed as the tunnel is constructed. Workers are required inside the tunnel to perform the excavation and/ or spoil removal. The excavation can be accomplished manually or mechanically.
650-2 Materials .
650-2.01 Casing.
A.General. Casing shall be of sufficient length and type and size as indicated on the contract documents.
B.Pipe Jacking or Utility Tunneling Cutting Shield. For a Pipe Jacking or Utility Tunneling operation, provide a steel cutting shield or poling plates designed to support the anticipated loading. The design shall allow for the attachment of temporary louvers in case collapsible soil conditions are encounter ed.
1.Full Tunnel Shield. The advancing face shall be provided with a hood extending not more than 20” beyond the face and extending around no less than the upper two -thirds of the circumference. It shall be of sufficient length to permit the installation of at least one complete ring of liner plates within the shield before it is advanced for the installation of the next ring of liner plates. It shall conform to and not exceed the outside dimensions of the pipe being installed by more than 1” at any point on the periphery, unless otherwise approved. It shall be adequately braced and provided with necessary appurtenances for completely bulkheading the face.
2.Partial Tunnel Shield. The advancing face shall be provided with a hood extending not more than 20” beyond the face and extending around no less than the upper one -third of the circumference. It shall conform to and not exceed the outside dimensions of the pipe being installed by more than 1” at any point on the periphery, unless otherwise approved.
3.Poling Plates. Poling plates shall be designed to support the ground outside the bounds of the tunnel through beam action. The beam action shall be capable of extending not more than 20” beyond the face and extending around no less than the upper one -third of the circum ference. The poling plates shall conform to the configuration of the pipe being installed.
C.Utility Tunneling Liner Plates. For a Utility Tunneling operation, provide tunnel liner plates designed to support the anticipated loading. When a shield is used, the tunnel lining shall be designed to withstand the thrust from jacking the shield.
1.Steel Tunnel Liner Plates. Provide tunnel liner plates manufactured from steel meeting the metallurgic requirements of ASTM A569 with the following mechanical properties before cold forming: ● Minimum tensile strength: 42,000 psi. ● Minimum yield strength: 28,000 psi. ● Elongation, 2”: 30%. Tunnel liner plates shall be 2 -flange with a minimum 0.209” thickness or 4 -flange with a minimum 0.239” thickness. The nominal diameter shall be as indicated in the contract documents. Actual liner plate thickness shall be determined by the Contractor. All tunnel liner plates shall be formed to provide circumferential flanged joints. Longitudinal joints may be flanged or offset lap seam type. All plates shall be punched for bolting on both longitudinal and circumferential seams or joints. Bolt spacing in circumferential flanges shall be
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 in accordance with the manufacturer’s standard spacing and shall be a multiple of the plate length so the plates having the same curvatures will be interchangeable and will permit staggering of the longitudinal seams. Bolt spacing at flanged longitudinal s eams shall be in accordance with the manufacturer’s standard spacing. For lapped longitudinal seams, bolt size and spacing shall be in accordance with the manufacturer’s standard but not less than the required to meet the longitudinal seam strength require ments of AASHTO Standard Specifications for Highway Bridges, Section 15 Steel Tunnel Liner Plates. All liner plates in the tunnel shall be the same type, and shall be interchangeable. Liner plates shall be hot -dip galvanized in accordance with ASTM A123. Bolts and nuts shall be not less than 5/8” in diameter. The bolts and nuts shall conform to ASTM A307 Grade A with rolled threads on bolts. Circumferential seam bolts shall conform to ASTM A307 or better. Grout holes shall be 2” minimum diameter tapped couplings welded into place over holes cut in the liner plate. Provide a minimum of three grout holes, one every ring alternating 10, 12 and 2 o’clock position. Grout holes shall be provided with steel or ir on threaded plugs.
2.Precast Concrete Tunnel Liner Plates. Precast concrete tunnel liner plates shall conform to the details shown in the contract documents and requirements of AASHTO Standard Specifications for Highway Bridges, Section 8 Concrete Structures. If such details are not provided, the Contractor may el ect to propose the use of precast concrete liner plates.
650-2.02 Filler Material.
A.Controlled Low Strength Material (CLSM). Fill any abandoned borings with controlled low strength material (CLSM) (no fly ash) meeting the requirements of Section 204.
B.Grout. Fill any voids/ annular space between the casing and excavated boring with grout meeting the following requirements: Material Subsection Portland Cement, Type 1 or 2 701-01 Grout Sand 703-04 Water 712-01 Bentonite (Optional) Bentonite Additives There are no material requirements for bentonite, except that it shall be supplied in powdered form.
650-2.03 Equipment. Furnish equipment of adequate capacity and power to install the casing by
trenchless installation methods. Supplement each rig with the necessary auxiliaries, appurtenances, tools, and other equipment required for proper operation. Tunnels may be excavated manually or by the use of tunnel boring machines (TBM's or "moles").
A.Safety Equipment for Tunnel Entry. For safe personnel entry to the confined space :
1.Provide a four gas meter atmospheric testing device, including oxygen, explosive gases, hydrogen sulfide and carbon monoxide. Testing equipment shall be calibrated as required by manufacturer and be in proper working condition.
2.Provide mechanical ventilation (portable blower with flexible duct work) to purge the confined space and provide continuous ventilation.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3
3.Provide body harness, life line, and mechanical retrieval equipment. If the confined space working environment has obstructions or turns such that mechanical retrieval equipment is not practical or creates more of a hazard, on -site rescue shall be immediat ely available prior to entry.
650-3 Construction Details
650-3.01 Approval . Construction drawings, showing the proposed method and procedure of trenchless
installation, construction of entrance and exit pits, and schedule of activities required to perform all trenchless installations indicated in the contract documents shall be submitted to the Engineer for approval before work on the trenchless installation operation is started. Approval of construction drawings shall not relieve the Contractor’s responsibility to perform the work without damage to existing facilities. Field con ditions may require changes in the approved drawings and such changes shall be subject to the approval of the Engineer. Approval will remain in force only as long as all conditions set forth in the approval are met and satisfactory results are obtained. In the event that unsatisfactory results and/or damage occurs, the Contractor shall stabilize the area and stop work, modi fy the methods of installation, and submit them for review and approval. Clear all drill hole(s) and path locations in accordance with 16 NYCRR 753 Protection of Underground Facilities . For an installation under a railroad, additionally contact the railroad company to identify the location of railroad underground facilities and the company’s additional requirements pertaining to the method of installation. Install casing of the length(s), size(s), and type(s) specified in the contract documents to the alignment(s) and profile(s) shown on the plans. For an installation under a railroad, work shall be carried out under the joint supervision of the Department a nd the railroad company, in accordance with §105 -09 Work Affecting Railroads.
A.Trenchless Installation Under Railroad. Construction drawings, methods, work and necessary precautions related to trenchless installation under a railroad shall be submitted to, meet the requirements of, and have the approval of the Chief Engineer of the railroad company. No work shall commence until such approval has been received from the railroad company.
B.Submittal. Do not start work prior to receiving the Engineer’s written approval. Approval will be based on the decision of the Deputy Chief Engineer for Technical Services (DCETS) as to the acceptability of the proposed work plan and any variations to provide satisfactory installation of the casing and avoid damage to the surrounding area and/or structure(s)/utilities. Installation of casing under railroads shall be jointly approve d by the Department and the railroad company. Information in this work plan shall include, but not be limited to, the following:
1.General.
a.Qualifications of the Contractor showing that all trenchless installation operations will be performed by a competent driller who has successfully installed casing on two projects in the past five (5) years, of similar size and type shown on the plans, via the proposed trenchless method. Completed projects with details of the types of installations, owner contact names, and telephone numbers shall be included.
b.Designed drill path indicating compliance with the contract documents. Unless otherwise indicated in the contract documents or directed by the Engineer, the minimum separation below the existing road surface and the top of casing shall be 5 f eet. The minimum separation between the final ground surface and the top of pipe outside the pavement area shall be 3 f eet.
650-3 01
NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 c. Equipment list including make and model number and specifications (catalog cuts) of all major equipment proposed for use. The Contractor is responsible for the final determination of the drill rig size based on the length and depth of the actual runs, the subsurface conditions expected, etc.
d.Monitoring plan for the proposed path of the casing installation, including location of monitoring points and surveying intervals.
e.Method for CLSM placement, including CLSM mix design, used for abandoning a boring.
f.Method for grouting (e.g. grout hole locations, attachment of grout tube to outer circumference of casing, grid pattern for ground surface approach, etc.), including grout mix design, used for filling voids/ annular space between the casing and excavated boring.
g.For instances where a utility is to be installed in the casing, method of installation and identification of the material to be placed between the casing and the utility carrier pipe. The material shall be nonconductive and retain its insulating propertie s during long -term submergence in water.
2.Auger Boring.
a.Plan showing the work zone equipment configuration at the ends of the bore(s), staging areas, storage areas, cuttings and pit spoil -handling areas, and final placement areas.
b.Boring procedure, thrust block design, tooling for drilling. Include details on the mechanical device that will prevent the cutting head from protruding ahead of casing and the need for a cutting shield at the head of casing.
c.Design of entrance and exit pits including shoring elements, type, depth, bracing size, etc. All flexible wall -system designs that are part of the construction submittal shall be stamped by a licensed and currently registered New York State Professional En gineer and shall be done in accordance with the procedures contained in the appropriate Departmental publication, Geotechnical Design Procedure for Flexible Wall Systems (GDP -11). This publication is available upon request to the Regional Director or th e Director, Geotechnical Engineering Bureau (DGEB).
d.Steering (e.g. articulated steering head) and tracking equipment (e.g. sonde transmitter & receiver, water level line, etc.), procedures, and proposed locations requiring surface or subsurface access.
3.Slurry Boring.
a.Plan showing the work zone equipment configuration at the ends of the bore(s), staging areas, storage areas, location of slurry, cuttings and pit spoil -handling areas, and final placement areas.
b.Boring procedure, tooling for drilling, water source for drilling operations, method to control slurry.
c.If pit launched, design of entrance and exit pits including shoring elements, type, depth, bracing size, etc. All flexible wall -system designs that are part of the construction submittal
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 shall be stamped by a licensed and currently registered New York State Professional Engineer and shall be done in accordance with the procedures contained in the appropriate Departmental publication, Geotechnical Design Procedure for Flexible Wall Systems (GDP - 11). This publication is available upon request to the Regional Director or the DGEB.
d.Materials list including bentonite and bentonite additives proposed for use on the project, along with material safety data sheets for all other materials used in the trenchless installation method.
e.Steering (e.g. articulated steering head) and tracking equipment (e.g. sonde transmitter & receiver, water level line, electromagnetic down -hole navigational system, etc.), procedures and proposed locations requiring surface or subsurface access.
4.Pipe Jacking.
a.Plan showing the work zone equipment configuration at the ends of the bore(s), staging areas, storage areas, location of slurry for pipe lubrication, cuttings and pit spoil -handling areas, and final placement areas.
b.Boring procedure, thrust block design, tooling for drilling, verification that size and type of casing can withstand installation stresses and method to verify that installed casing is acceptable. Include details on the cutting shield at the head of casi ng and type of soil conveyance system to be utilized (e.g. wheeled carts, belt conveyor, slurry system, auger system, vacuum extraction system).
c.Design of entrance and exit pits including shoring elements, type, depth, bracing size, etc. All flexible wall -system designs that are part of the construction submittal shall be stamped by a licensed and currently registered New York State Professional E ngineer and shall be done in accordance with the procedures contained in the appropriate Departmental publication, Geotechnical Design Procedure for Flexible Wall Systems (GDP -11). This publication is available upon request to the Regional Director or th e DGEB.
d.Materials list including bentonite and bentonite additives proposed for pipe lubrication, along with material safety data sheets for all other materials used in the trenchless installation method.
e.Steering and tracking equipment (e.g. laser & survey tools), procedures and proposed locations requiring surface or subsurface access.
f.Outline of work in accordance with §107.05 Safety and Health Requirements, R. Confined Spaces and a written confined space plan (addresses prevention of unauthorized entry, type of hazard, work practices, monitoring, provision for attendant, duties of employees, rescue and emergency medical services, multi -employer operations, and provisions for review procedures).
5.Microtunneling.
a.Plan showing the work zone equipment configuration at the ends of the bore(s), staging areas, storage areas, location of slurry for pipe lubrication, cuttings and pit spoil -handling areas, and final placement areas.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 b. Boring procedure, thrust block design, tooling for drilling, verification that size and type of casing can withstand installation stresses and method to verify that installed casing is acceptable. Include details on spoil removal system and controlling g round conditions via earth pressure balance at the face of the microtunneling boring machine (MTBM) (i.e. slurry or auger).
c.Design of entrance and exit pits including shoring elements, type, depth, bracing size, etc. All flexible wall -system designs that are part of the construction submittal shall be stamped by a licensed and currently registered New York State Professional E ngineer and shall be done in accordance with the procedures contained in the appropriate Departmental publication, Geotechnical Design Procedure for Flexible Wall Systems (GDP -11). This publication is available upon request to the Regional Director or th e DGEB.
d.Materials list including bentonite and bentonite additives proposed for use on the project, along with material safety data sheets for all other materials used in the trenchless installation method.
e.Steering and tracking equipment (e.g. laser & survey tools), procedures and proposed locations requiring surface or subsurface access.
6.Horizontal Directional Drilling.
a.Plan showing the work zone equipment configuration at the ends of the bore(s), staging areas, storage areas, location of slurry, cuttings and pit spoil -handling areas, and final placement areas.
b.Boring procedure, tooling for drilling, water source for drilling operations, method to control slurry.
c.If pit launched, design of entrance and exit pits including shoring elements, type, depth, bracing size, etc. All flexible wall -system designs that are part of the construction submittal shall be stamped by a licensed and currently registered New York Sta te Professional Engineer and shall be done in accordance with the procedures contained in the appropriate Departmental publication, Geotechnical Design Procedure for Flexible Wall Systems (GDP - 11). This publication is available upon request to the Region al Director or the DGEB.
d.Materials list including bentonite and bentonite additives proposed for use on the project, along with material safety data sheets for all other materials used in the trenchless installation method.
e.Steering (e.g. offset jets incorporated into a direction sensing and steering head) and tracking equipment (e.g. sonde transmitter & receiver, electromagnetic down -hole navigational system, etc.), procedures and proposed locations requiring surface or sub surface access.
7.Utility Tunneling.
a.Plan showing the work zone equipment configuration at the ends of the bore(s), staging areas, storage areas, cuttings and pit spoil -handling areas, and final placement areas.
b.Boring procedure and tooling for tunneling. Include details on how to control the tunnel face (i.e. design calculations for a full tunnel shield or poling plates) and type of soil
650-3 02
NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 conveyance system to be utilized (e.g. wheeled carts, belt conveyor, auger system, vacuum extraction system).
c.Design of entrance and exit pits including shoring elements, type, depth, bracing size, etc. All flexible wall -system designs that are part of the construction submittal shall be stamped by a licensed and currently registered New York State Professional Engineer and shall be done in accordance with the procedures contained in the appropriate Departmental publication, Geotechnical Design Procedure for Flexible Wall Systems (GDP -11). This publication is available upon request to the Regional Director or the DGEB.
d.Steering and tracking equipment (e.g. laser & survey tools), procedures and proposed locations requiring surface or subsurface access.
e.Outline of work in accordance with §107.05 Safety and Health Requirements, R. Confined Spaces and a written confined space plan (addresses prevention of unauthorized entry, type of hazard, work practices, monitoring, provision for attendant, duties of employees, rescue and emergency medical services, multi -employer operations, and provisions for review procedures).
f.Engage the services of a professional engineer currently registered in the State of New York to provide the design of the Utility Tunnel.
1.Steel tunnel liner plate(s) shall be designed in accordance with AASHTO Standard Specifications for Highway Bridges, Section 15 Steel Tunnel Liner Plates. The design of the tunnel shall incorporate the combined effects of live and dead loads, hydrostatic loads, and loads, both temporary and permanent caused by the Contractor’s methods of construction. The design shall meet the following minimum criteria:
a.Tunnel liner design shall meet the following minimum factors of safety:
b.Minimum Stiffness: 3.0.
c.Critical Buckling: 2.0.
d.Seam Strength: 3.0.
2.Precast concrete tunnel liner plate(s) shall be designed in accordance with AASHTO Standard Specifications for Highway Bridges, Section 8 Concrete Structures. The design of the tunnel shall incorporate the combined effects of live and dead loads, hydrostat ic loads, and loads, both temporary and permanent caused by the Contractor’s methods of construction. Submit working drawings and design calculations including descriptions of materials to be used, plate dimensions, reinforcement details, connecting de tails, and erection procedures.
650-3.02 Trenchless Installation Procedures. Shore entrance and exit pits in accordance with the
approved design. Adequately protect any utilities located within the thrust block’s zone of influence. Survey the existing ground surface along the proposed path of casing installation prior to the start of work to set baseline data. Establish survey points in accordance with the approved design to determine presence/extent of ground movements.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 A. Installation. Install the casing as follows:
1.The alignment of the casing shall conform to the following requirements:
a.Choose the ground entry and exit angles such that the casing can be installed along the alignment and profile indicated on the contract plans.
b.The entrance point(s) and exit point(s) shall be approved by the Engineer and physically located in the field by the Contractor.
c.The exit point shall be no more than ±1% of the bore length left or right of the location marked in the field.
d.The vertical depth, as specified in the contract documents, is the depth to which the casing shall be installed.
2.Direct all drilling operations using steering and tracking systems capable of producing the required alignment within an allowable accuracy of ±1% of the bore length. Maintain the grade within 2 inches throughout the bore length. The steering control system shall provide an angle of inclination reading and the direction in which the cutting tool is pointing. Provide access to the Engineer at all times to all measuring or gauging devices used for the dri lling operations, including drilling logs maintained by the Contractor.
3.Closely monitor the trenchless installation process to eliminate ground movements. If ground movements occur, stop work and immediately stabilize the area of concern. If it is determined during the installation process that the proposed lines and grades fo r the casing cannot be achieved, stop work. The Contractor shall then modify the methods of installation and submit them for review and approval as stated in §650 -3.01.Approval. Corrective stabilization actions are at the Contractor’s expense.
4.In the event that the drill hole must be abandoned before completion of the installation or the installation is out of tolerance, fill the abandoned drill hole with CLSM to prevent subsidence. Start pumping from the farthest point of progression of the abandoned drill hole back to the surface to eliminate encapsulating voids. The progression and restoration of the abandoned drill hole by CLSM placement will be at the Contractor’s expense. The location of the new drill hole shall be approved by the DCETS prior to progression of the operation as per §650 -3.01. Approval.
5.For larger diameter casings, several passes with progressively larger cutting tools is allowable for producing the appropriate bore hole diameter.
6.For entry into casing by personnel:
a.Provide confined space training prior to entry, when there is a change in operations, or when deviation in policy occurs.
b.Entry Supervisor shall verify the requirements of the Entry Permit, ensure means of rescue are readily available, cancels or terminates entry as required, removes unauthorized personnel, and periodically monitors the Pipe Jacking operation for conformance.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 c. Attendant shall maintain accurate account of authorized entrants, remains at entry site until relieved by another attendant or until work is complete, monitors conditions around space and maintains communication with entrant(s), and performs non -entry resc ue or summons rescue and medical services, as needed.
d.Entrant(s) shall properly use required equipment, maintain communication with Attendant, and evacuate if emergency occurs.
e.Confined spaces shall be monitored for oxygen, carbon monoxide, and explosive gases before and during entry. When organic material is present, hydrogen sulfide levels will be tested. Testing shall be conducted from top down as space allows at various level s. Test results shall be recorded on the permit. Entry shall not be made or the space shall be vacated when:
1.Oxygen levels are less than 19% or greater than 23%; or
2.Explosive gases are greater than 10% of lower explosion limit; or
3.Toxic gases greater than permissible exposure limits; or
4.Carbon Monoxide levels are greater than 35 ppm; or
5.Hydrogen Sulfide levels are greater than 10 ppm.
f.Excavation shall not be advanced beyond the edge of the hood, except in rock, or with extreme care, to remove obstructions.
7.Grout voids/ annular space between the casing and excavated boring in accordance with the methods approved in the submittal process as stated in §650 -3.01.Approval.
8.For instances where a utility is to be installed in the casing, place the utility carrier pipe within the casing such that they are electrically insulated from each other.
B.Trenchless Installation Records. After completion of the casing installation(s), submit to the Engineer the installation records detailing the As -Built location of the casing(s).
C.Trenchless Installation Under Railroad. Rail hangers shall be installed in accordance with the Temporary Track Support System item prior to the trenchless installation operation if required by the railroad company. In instances where unforeseen ground movements have occurred as a result of the trenchless installation operation, the rail hangers will not be removed by railroad forces until all ground movements of the embankment have been stabilized by the Contractor to the satisfaction of the railroad co mpany.
650-3.03 Subsidence. The Contractor shall be held responsible for surface subsidence and damage or
disturbance to adjacent property and facilities that may result from the construction methods. In case loose material is encountered and cave -ins occur or are anticipated, all t renchless installations shall be discontinued, approved shoring shall be provided and all voids filled either by pressure grouting or other approved methods before installations is continued. Field conditions may require that the actual trenchless installation operations be continued without interruption in order to prevent undermining the roadway or the railroad roadbed and tracks. Should the
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 202 4 VOLUME 3 Engineer permit interruption of trenchless installation operations in these instances, the Contractor shall provide bulkheads and dewatering measures as approved by the Engineer.
650-3.04 Railroad Responsibility. Any settlement or upheaval of the railroad tracks resulting from the
casing installation and occurring within one year from the date the work is completed, will be corrected by the railroad company.
650-4 METHOD OF MEASUREMENT. The quantity to be paid for under this work will be the
number of feet of casing, measured to the nearest foot, satisfactorily installed to the required length, grade, and alignment in accordance with the contract documents and as directed by the Engineer.
650-5 Basis of Payment
650-5.01 General. The unit price bid per linear f oot shall include the cost of furnishing all labor,
materials, and equipment (including dewatering if required) necessary to satisfactorily complete the work. Rail hangers (if required) shall be furnished, installed, and removed as called for in the Temporary Track Support System item included in the contract documents. This work will be paid for separately. Costs incurred by the railroad company to correct settlement or upheaval of the railroad tracks resulting from the casing installation and occurring within one year from the date of work is completed, will be reimbursed to the railroad company directly by the State at no cost to the Contractor. Surveying for the presence/extent of ground movements during the trenchless installation shall be paid for separately. Payment will be made under: Item No. Item Pay Unit 650.10XX Trenchless Installation of Casing Under Highway Foot with a diameter less than or equal to 24”. 650.11XX Trenchless Installation of Casing Under Highway Foot with a diameter greater than 24” and less than or equal to 42”. 650.12XX Trenchless Installation of Casing Under Highway Foot with a diameter greater than 42”. 650.20XX Trenchless Installation of Casing Under Railroad Foot with a diameter less than or equal to 24”. 650.21XX Trenchless Installation of Casing Under Railroad Foot with diameter greater than 24” and less than or equal to 42”. 650.22XX Trenchless Installation of Casing Under Railroad Foot with a diameter greater than 42”. NOTE : XX denotes casing diameter size . SECTION 651 - COMMUNICATION FACILITIES
651-1 DESCRIPTION. The work in this section shall include special construction of communication
facilities which are required for outside agencies such as police and fire departments. The construction details for this work will be covered by special provisions in the contract documents. SECTION 652 - FURNISHING AND APPLYING SALTS
652-1 DESCRIPTION. Under this work the Contractor shall furnish and apply salt for soil
stabilization, as a dust palliative or for other purposes as specified.
Source: New York Standard Specifications, 2024 Edition. Pages 724–733 of 1,264.