What is ASTM C478?

Table of Contents

The ASTM C478 standard contains the requirements for the manufacture and purchase requirements of products used for the assembly and construction of circular, vertical precast concrete manholes and structures. The scope of C478 includes structures used in precast sewer, drainage and water works.

Are precast manholes reinforced?

Welded wire reinforcing or hoop steel is commonly used in precast concrete manholes. The minimum total wall reinforcing area required is 0.0025 times the internal diameter in inches per vertical foot as noted in ASTM C478.

What is ASTM C913?

ASTM C913-02. February 10, 2002. Standard Specification for Precast Concrete Water and Wastewater Structures. 1.1 This specification covers the recommended design requirements and manufacturing practices for monolithic or sectional precast concrete water and wastewater structures with the exception of…

Is code for precast manholes?

Cement used for the manufacture ofprecast concrete manhole covers shall conform to IS 269 or IS 455 or IS 1489(part 1) or IS 1489(Part 2)or IS6909or IS8041 orIS 8043 orIS 81120rlS 123300rIS 12269.

How thick is a manhole?

b) Manholes 4 feet (1219 mm) in diameter shall have a bottom at least 6 inches (152 mm) thick and a wall at least 5 inches (127 mm) thick. c) Manholes 5 feet (1524 mm) in diameter shall have a bottom at least 8 inches (203 mm) thick and a wall at least 6 inches (152 mm) thick.

Is code for precast concrete?

IS 15916
IS 15916: Building Design and Erection Using Prefabricated Concrete – Code of Practice.

What is FRC cover?

Fibre Reinforced Concrete (FRC) Manhole Covers are replacement for iron manhole cover.FRC manhole covers for light, medium and heavy- duty applications having a circular shape.

What is the minimum depth of manhole?

(ii) Normal Manholes: Normal manholes (or medium manholes) are those which have depth more than 0.9 m and up to 2 m. These manholes may be of square or rectangular shape with minimum internal size 1 m x 1 m or 1.2 m x 0.9 m, or of circular shape with minimum internal diameter 0.9 m.

What is a standard manhole diameter?

Precast 4-ft (48-in) diameter manholes are commonly used for both sanitary and stormwater access points.

Is code for precast structures?

IS 15916: Building Design and Erection Using Prefabricated Concrete – Code of Practice.

What are the different precast elements?

Elements of Precast Concrete Building

Precast Footings. Precast footings are foundations that are easy to install and use as soon as they arrive on site.
Beams. Precast concrete beams are an integral feature of many buildings today.
Columns.
Shear Walls.
Partition Walls.

What is the maximum depth of a plastic manhole?

The deeper pre-formed plastic inspection chambers will be 450mm diameter but the opening must be restricted to a maximum of 350mm diameter to help prevent people falling down them. This will allows them to be used at depths up to three metres for foul or surface water drainage.

How do you choose a manhole size?

As a general rule, the minimum concrete leg between openings for adjacent pipes in manholes is 6 in. (150 mm), based on the outside diameter of the intersecting pipe. Blockout or cutout diameters are based on the outside diameter of the pipe plus a distance not to exceed 4 in. (100 mm).

How do you calculate a manhole?

Example: If the manhole invert elevations are 101.00 for one manhole and 99.00 for the other, then the difference between the two manhole inverts will be 2.0 feet. Take the invert difference (2.0 feet) and divide it by the pipe distance (300 feet). The pipe slope will be 0.0067 feet per hundred feet or 0.67%.

What is manhole coring?

A cored hole is created by cutting a precision opening in a hardened concrete manhole using diamond-tipped core bits. The diameter of cored openings can be as large as 48 inches. Perhaps the biggest benefit of coring holes is the reduction in production lead times of manhole sections having unique hole placements.

What is ASTM c478?

What is the scope of c478?

The scope of C478 includes structures used in precast sewer, drainage and water works. ASTM C478 is an important standard under the jurisdiction of ASTM C13, the technical committee on concrete pipe, established in 1931.

Is there a metric equivalent to specification C 478m?

Note 1—Future products will to be included in Part II in a future revision of this specification. 1.4 A complete metric companion to this specification has been developed, Specification C 478M; therefore, no metric equivalents are presented in this specification.