Box Pushing Technique – Sas Infratech

Basic Procedures Involved InBox Pushing Technique

Box pushing is a technique that is being used to make underpass and subways below the road where open cut system is not possible. The purpose of pushing of Box is to form a horizontal opening below ground or through embankments, can say a tunnel, by providing precast box units underground or an embankment, without disturbing the overhead amenities, like traffic & structures. Box Pushing Technique is developed; where in R.C.C. Boxes in segments are cast outside on thrust bed and pushed through the heavy embankments of Rail or Road by Jacking

This technique is very suitable when the intensity of traffic at location of construction is very heavy and it cannot be disturbed so instead of open cut system this technology is being used.

S.No.	Description
01.	Piles are installed on the periphery of the area to be excavated.
02.	Excavation is carried out in steps. Soil is supported with wooden planking and steel reaction frames are fixed.
03.	Excavation is then completed up to the bottom of the thrust bed. After leveling, PCC of mix M-15 is poured in the required thickness to achieve the correct level for laying the thrust bed.
04.	Reinforcement is fixed in position, pockets are made, and the required shuttering is provided for concreting of the thrust bed. The reaction wall is constructed.
05.	After the thrust bed is cast, a 50mm screed layer is laid above it. Screed is placed over ISMC 100, fixed on top of the thrust bed.
06.	Boxes are cast on the thrust bed starting with the placement of a polythene sheet, cutting edge in the first box, and guide sheets, followed by fixing of reinforcement. Shuttering is completed along with the framework for jacking pockets. Concreting is completed and drag sheets are fixed in the first box.
07.	After the boxes are cast, eye openings are made before the start of pushing.
08.	When the box is ready for pushing, pockets are cleaned and pushing pins are fixed in them, followed by fixing of jacks. Thereafter, pushing is carried out in increments.
09.	Once a box is completely pushed from the thrust bed, another box is placed behind it and pushing is continued along with excavation of soil.
10.	The process is continued until all boxes are pushed.
11.	The first box enters the opening at the other end.
12.	Finally, jacks between the boxes are removed one by one and the gap is closed successively.
13.	Joints are sealed to prevent the ingress of water into the opening.

01.

First h piles are installed on the periphery of are to be excavated.

02.

Excavation is carried out in steps. Soil is supported with wooden planking and steel reaction frames are fixed.

03.

Excavation is then completed upto bottom of thrust bed. After leveling PCC of mix m-15 is poured in provided thickness so as to achieve the correct level to lay the thrust bed.

04.

Reinforcement is fixed in position followed by pockets and required shuttering is being provided for concreting of the thurst bed and reaction wall is carried out.

05.

After thrust bed is casted, a layer of 50mm screed is to be laid above the bed. Screed is being lays over ismc 100, fixed on top of thurst bed.

06.

Boxes are cast on thurst bed starting from placement of polythene sheet, cutting edge in first box and guide sheets followed by fixing of reinforcement. Shuttering is completed along with framework for jacking pockets. Finally concreting is completed and drag sheet are fixed in first box.

07.

After boxes are casted eye opening is made before start of pushing.

08.

When box is ready for pushing, pockets are cleaned and pushing pins are fixed in them followed by fixing of jacks. Thereafter, pushing is carried out in increments.

09.

Once a box is completely pushed from thrust bed, another box is placed behind it and pushing is continued along with excavation of soil.

10.

The process is continued until all boxes are pushed.

11.

And First Box Enters The Opening At Other End.

12.

Finally, jacks betw en the boxes are removed one by one and gap is closed successively.

13.

Joints are sealed to prevent ingress of water in the opening.

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