Large-opening inverse trenching technology

A reverse method and large opening technology, which is applied in excavation, building construction, construction, etc., can solve the problems of small number of borrow holes, prolong the construction period, increase the amount of secondary lightering, etc., and achieve shortened structural construction time, Effect of increasing efficiency and speed, reducing underground transfer volume

Inactive Publication Date: 2007-06-13
SHANGHAI NO 7 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the structural form of the first floor of the building, the excavation openings of the reverse construction method are arranged. Generally, the area of ​​the borrowing openings is small. When excavating, a special ventilation system must be erected, which brings many difficulties to the construction; the number of borrowing openings It is also less, resulting in a longer distance between the soil intakes, which increases the engineering volume of the second lightering and directly increases the project cost; and the first floor is generally not allowed to use large-scale construction transport vehicles and machinery, and the transportation must be carried out in various places. The operation surface is carried out, which greatly prolongs the construction period
[0004] Therefore, for projects with large foundation pit area and deep depth, high requirements on deformation control and structural quality, large layer height changes, fast excavation speed, and tight construction progress, the traditional reverse excavation construction technology cannot be applied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A project has a large foundation pit area of ​​40,000m 2 , with a depth of 12.6m, involving a micro-confined water layer, and the surrounding environmental conditions are complex.

[0020] The calculation of the distribution of the borrow hole takes into account the needs of ventilation and lighting, and also takes into account the maximum turning radius of the excavator when excavating the earthwork below, so as to minimize the transportation volume of the underground earthwork, and transfer the transportation to the roof as much as possible, so that the transportation can be facilitated by using the roof Advantages to speed up construction. Fully mechanized construction methods were also used during the excavation.

[0021] According to the total volume of earthwork excavation, construction period and construction conditions, the number and location of the soil-borrowing holes of the whole project are determined. The number of soil-borrowing holes on each floor is ab...

Embodiment 2

[0023] A certain project has a large foundation pit area, up to 15000m 2 , with a depth of 13m, and the surrounding environmental conditions are complex.

[0024] According to the total volume of earthwork excavation, construction period and construction conditions, the number and location of the soil-borrowing holes of the whole project are determined. The number of soil-borrowing holes on each floor is about 10, and the area of ​​each hole is about 600-600 square meters. 700m 2 , the distance between two adjacent openings is 30m. A large hydraulic excavator (R=20m) is equipped around the entrance of the cave, and a certain number of small hydraulic excavators (R=6~8m) are equipped in the pit. The earthwork assembly line, the small machine relay combination transfer, the method of transporting the earth to the excavation hole. The excavation and transportation of the earthwork all adopt mechanical devices, which improves the work efficiency and shortens the construction pe...

Embodiment 3

[0026] A project has a large foundation pit area of ​​33000m 2 , with a depth of 12m, and the surrounding environmental conditions are complex.

[0027] According to the total volume of earthwork excavation, construction period and construction conditions, the number and location of the soil-borrowing holes of the whole project are determined. The number of soil-borrowing holes on each floor is about 15, and the area of ​​each hole is about 600~ 700m 2 , the distance between two adjacent openings is 40m. A large hydraulic excavator (R=20m) is equipped around the entrance of the cave, and a certain number of small hydraulic excavators (R=6~8m) are equipped in the pit. The earthwork assembly line, the small machine relay combination transfer, the method of transporting the earth to the excavation hole.

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Abstract

The invention supplies big opening backward practicing excavating technique. It includes the following steps: selecting unearthed cave mouth on the structure top plate; excavating. Its features are that the distance of the adjacent two borrow cave mouths is 20-40m; and their area is 600-700m2. The technique can increase excavating efficiency and speed, avoid earthwork transportation inconvenience caused by dark excavating plane, and shorten structure construction time for each construction block.

Description

technical field [0001] The invention relates to an upside-down method construction technology in current construction, in particular to a large-opening upside-down method excavation technology. Background technique [0002] Most of the unearthed and transported by the conventional upside-down method have the following characteristics: the total area of ​​the building foundation pit and the corresponding earthwork volume of the general upside-down method are not large. , combined with mechanical excavation and manual excavation, the purpose of engineering requirements can be achieved. [0003] According to the structural form of the first floor of the building, the excavation openings of the reverse construction method are arranged. Generally, the area of ​​the borrowing openings is small. When excavating, a special ventilation system must be erected, which brings many difficulties to the construction; the number of borrowing openings It is also less, resulting in a longer d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E04B1/35
Inventor 王美华粱其家季方王卫东吴杏第宋文俊尤雪春
Owner SHANGHAI NO 7 CONSTR
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