Precast concrete jacking pipes, Civil Engineering

Assignment Help:

Question

While precast concrete jacking pipes, from time to time grout holes are calculated inside these precast pipes. Give specific and key reasons?


Answer


Grout holes are there in precast jacking pipes for following reasons-

(i) They serve as locations for inoculation of bentonite or other lubricant. Lubricant is used for together granular top soils and cohesive soils to trim down frictional resistance. For cohesive soils, soils cannot get onto pipes by presence of lubricant and the shearing plane lies within lubricant. On other hand, for granular soils, lubricant mixes with soils with a considerably reduced friction. With use of lubricant, longer pipe lengths are able to be jacked without use of intermediate jacking station.

(ii) They give inlet locations for subsequent grouting works after completion of pipe jacking to fill totally the void space b/w pipes and surrounding soils.

(iii)They are used as lifting holes while placing precast jacking pipes into rails within jacking pits.

 

 


Related Discussions:- Precast concrete jacking pipes

Verify the total active thrust on the wall per lineal metre, A smooth backe...

A smooth backed vertical wall is 6.3 m high and retains a soil with a bulk unit weight of 18 kN/m 3 and φ = 18°. The top of the soil is level with the top of the wall and is horiz

Traverse surveying, How to calculate the whole circle bearing from the incl...

How to calculate the whole circle bearing from the included angles?

What is the cost of phoenix activity, Q. What is the cost of phoenix activi...

Q. What is the cost of phoenix activity? Phoenix activity has a range of impacts on the Australian economy. Employees lose entitlements when phoenix activity has occurred and w

Explain ductile iron pipes and mild steel pipes, Ductile iron pipes vs. mil...

Ductile iron pipes vs. mild steel pipes as pressurized pipelines For water main pipe size less than 600mm, ductile iron is generally used since internal welding for steel pipe

What is the sludge volume index, What is the Sludge Volume Index? Two 1...

What is the Sludge Volume Index? Two 1 L samples of mixed liquor are taken from a lagoon. After settling for 30 min in a graduated cylinder, 250 mL of solids have settled out i

Casing has to be left in for mini-piles, Question What are thought in d...

Question What are thought in determining whether casings have to be left in for mini-piles ? Answer Contrary to most of pile design, design of min-piles is controlled

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd