By American Society of Civil Engineers
This common covers layout and prompt set up approaches for precast concrete pipe for jacking in trenchless building meant for the conveyance of sewage, business wastes, typhoon water and drainage and for utilities and entry methods. The structural layout of concrete pipe is predicated on a limits country layout technique that money owed for power and serviceability standards and is in step with the systems in part 17 of the ''''AASHTO ordinary necessities for street Bridges''''. The layout standards contain: structural points, comparable to circumferential flexure, thrust, shear and radial stress strengths; crack width keep watch over; longitudinal thrust produced by means of jacking; and necessities for dealing with and deploy
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Extra info for Standard practice for direct design of precast concrete pipe for jacking in trenchless construction
3-mm) cracks (see Reference [COM 14]). The crack control equations were developed from tests on pipe with approximately 1 in. (25 mm) of cover on the tension reinforcement. Therefore, pipe designed with more than 1 in. 01-in. 3-mm) crack approximately 1 in. (25 mm) from the tension steel and a wider crack at the surface of the concrete. For pipe with more than 1 in. (25 mm) of cover over the tension reinforcement, the crack width limit at the surface of the concrete may be estimated relative to the calculated crack width limit at 1 in.
The number of rams, ram diameter, and stroke length will vary according to the size and length of the pipe to be jacked, and contractor's equipment and technique. 5 The jacking force is transmitted from the rams to the pipe by means of a thrust ring, jacking collar, or beam. 0 SHIELDS may need to be of a watertight design depending on subsurface conditions. 3 The amount of overbore is the difference between the maximum allowable dimension of the outside diameter of the shield and the outside diameter of the pipe being jacked.
15-1). The maximum end cover on the last circumferential shall be 1 1/2 in. (38 mm). COMMENTARY PART I. 0 SCOPE The ASCE Standard Practice for Direct Design of Precast Concrete Pipe for Jacking in Trenchless Construction, hereinafter referred to as the Practice, provides for the direct design of precast concrete pipe of circular shape for jacking in trenchless construction. Direct design requires determining the earth loads and pressure distributions on the pipe, based on soil properties and installation type, analysis to determine circumferential moments, thrusts and shears, and design to determine circumferential reinforcement; and requires determining axial longitudinal forces on the pipe and the resulting stresses in the joint, and, if necessary, design of longitudinal reinforcement.