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601276 CORRUGATED POLYPROPYLENE PIPE , TYPE S , 36" LF

DE · 2025 Standard SpecificationsBook pages 184–186View official source ↗

PIPE CULVERTS SECTION 601 174 ITEM DESCRIPTION UNIT 601276 CORRUGATED POLYPROPYLENE PIPE , TYPES , 36" LF 601277 CORRUGATED POLYPROPYLENE PIPE , TYPES , 42" LF 601278 CORRUGATED POLYPROPYLENE PIPE, TYPES, 48" LF 601279 CORRUGATED POLYPROPYLENE PIPE , TYPES , 60" LF 601280 PERSONNEL SAFETY GRATE FOR PIPE INLET EACH

DRAINAGE STRUCTURES SECTION 602 175 SECTION 602 — DRAINAGE STRUCTURES

602.1Description.

This work consists of constructing, providing, replacing, adjusting, and repairing drainage inlets, drainage inlet frames and grates, manholes, manhole frames and covers, and junction boxes.

602.2Materials.

A.GABC Section 1005

B.PCC, Class A or B Section 1022

C.Expansion Joint Material Section 1042 .2.A

D.Bar Reinforcement Section 611 and Section 1037

E.Liquid Membrane -Forming Compounds fo r Curing Section 1022

F.Welding AASHTO / AWS D1.1 Welding Code

G.Castings Section 1039.7

H.Steps AASHTO M199 and ASTM C478

I.Borrow, Type C Section 1001

J.Rectangular Precast Structures ASTM C913

K.Round Precast Structures AASHTO M199

L.Joint Sealant Section 1042.2.B

M.Non -Shrink Grout Section 1047.2

N.Mortar Section 1047.6

O.Silan e-Based Concrete Sealer Section 104 5.3

P.Precast Flexible Joint Sealant Section 1042.5

602.3Construction.

A.Shop Drawings

1.Submit shop drawings that include quantities and locations for installations not meeting

Standard Construction Details before fabrication for:

a.Drainage inlets, manholes, and junction boxes. Include design calculations ensuring the

proposed structure can handle all loads including the HS -20 live load.

b.Drainage inlet frames and grates, and manhole frames and covers.

c.Drainage inlet frames , manhole frames , and junction boxes that require adjustments or repair.

2.For locations that require repair, adjustments, or replacement, include field measurements to

determine the exact sizes of the drainage inlet frames and grates, and manhole frames and covers before placing the order. DRAINAGE STRUCTURES SECTION 602 176 3. For locations that require the repair of existing junction boxes, include field measurements to determine the exact sizes of the top cover slab and hinge. Also include all parts and fittings for installation.

4.Use drainage inlet frames and grates, and manhole frames and covers capable of meeting or

exceeding HS -25 load rating requirements in accordance with AASHTO M306.

5.Use PCC, Class A for drainage inlets, manholes, and junction boxes that do not conform to the

requirements of the Standard Construction Details;

B.Constructing Drainage Inlets, Manholes, and Junction Boxes

1.Refer to shop drawings, contract documents, or Standard Construction Details for dimension

and structure requirements.

2.Excavate and backfill in accordance with Section 207.3. Compact the structure foundation to a

firm, even surface, to the acceptance of the engineer.

3.Use cast -in-place construction for drainage structures that tie into existing pipes and structures

unless otherwise specified in the contract. The contractor may request use of precast structures subject to the engineer’s approval. Use precast structures for new construction unless otherwise specified in the contract.

4.Construct cast -in-place reinforced concrete structures in accordance with Section 610.

5.Construct precast reinforced concrete structures in accordance with Section 612.

6.Provide precast reinforced concrete round manhole riser sections and appurtenances in

accordance with AASHTO M199.

7.Set the frames of castings in concrete.

8.For drainage inlets, manholes, and junction boxes that use a removable top slab or are 4 -feet or

deeper when measured from the top of grate or cover to the invert of the lowest pipe , install steps at an accessible location . Ensure that the steps have a minimum embedment of 3 -inches into the wall and protrude out 6 inches from the wall. Begin steps within 24 -inches of the top of grate or lid and place the last step no more than 12 -inches above the lowest invert except where a pipe is in the same wall as t he steps in which case the last step must be placed such that the last step is no more than 12 -inches from the top of the pipe . Place steps vertically 12 - inches apart.

9.Ensure inlet and outlet pipes are the same size and type as the connecting pipes shown in the

contract and that pipes extend through, and are flush with, the inside of the wall. When cutting off the end of a reinforced concrete pipe, finish with mortar so that no reinforcement steel remains exposed. Fill any space between the pipe and the walls of the drainage inlet with non - shrink grout conforming to the requirements of Section 1047, with a minimum strength of 5,000-PSI. Ensure that the pipe opening in the drainage inlet is no more than 4 -inches larger than the pipe diameter measured from the outside wall of the pipe.

10.Construct , finish, and cure cast-in-place structures other than top units in accordance with

11.Construct , finish, and cure the structure top units in accordance with Sections 501.3 or 503.3.

12.Pour the flow channel to provide positive flow. Cure the flow channel with materials in

accordance with Section 1022.6 except water curing will not be permitted.

Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 184–186 of 779.

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