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Subway covered top-down excavation structure and construction method thereof

A cover-excavation and subway technology, which is applied in the direction of foundation structure engineering, underwater structures, artificial islands, etc., and can solve problems affecting the strength of the roof

Pending Publication Date: 2020-10-20
CHINA RAILWAY FIRST GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The cover-and-excavation method is to build the enclosure structure and intermediate piles of the foundation pit downward on the ground surface. Like the cover-excavation method, the enclosure structure of the foundation pit mostly adopts underground diaphragm walls or curtain piles, and the intermediate support mostly uses the main structure itself. The middle column can be used to reduce the project cost, and then the surface soil can be excavated to the ground level of the roof of the main structure, and the unexcavated soil can be used as a soil mold to pour the roof. The roof can be used as a strong horizontal brace to prevent The structure is deformed into the foundation pit. After backfilling, the road will be restored to restore traffic. To transport the excavated soil and sand, it is necessary to set up temporary holes in many places on the roof. If there are too many temporary holes, it will affect the strength of the roof.

Method used

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  • Subway covered top-down excavation structure and construction method thereof
  • Subway covered top-down excavation structure and construction method thereof
  • Subway covered top-down excavation structure and construction method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] see Figure 1-5 , a subway cover excavation reverse structure, including support piles 1, the number of support piles 1 is four, and the number of support piles 1 is distributed around the sand outlet 6 at equal intervals, and the material of the support piles 1 is I-beam, through the set support Pile 1 increases the support point of the top plate 5, thereby increasing the strength of the top plate 5, the top of the support pile 1 is fixedly connected with the support plate 2, the surface of the support plate 2 is provided with fixing holes 3, and the number of the fixing holes 3 is four, and Distributed at equal intervals on the surface of the support plate 2, the support pile 1 is located at the center of the bottom of the support plate 2, the inner wall of the fixing hole 3 is threaded with a connector 4, and the connection between the support pile 1 and the top plate 5 is more stable through the provided connector 4 , so that the support pile 1 does not tilt during ...

Embodiment 2

[0036] A construction method for an excavated and inverted structure of a subway cover: specifically comprising the following steps:

[0037] First, if Figure 1-Figure 5 As shown, prepare 4 support piles, install the chassis 10 at the bottom of the support pile 1, install the base 11 at the bottom of the chassis 10, install the fixed pile 26 at the bottom of the base 11, and install and connect the active bearing on the surface of the fixed pile 26 near the top. Gear 12, wherein the inner ring of driving gear 12 is installed and connected with fixed block 13, and the inner wall of fixed block 13 is installed with positioning stud 14, on the surface of driving gear 12, it is connected with rotating toothed disc 15 through meshing, wherein the inner ring of rotating toothed disc 15 Engage and install the rotating screw mandrel 16, install the rotating pile 17 at the bottom of the rotating screw mandrel 16, install the anti-off pile 18 at the top of the rotating screw mandrel 16...

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Abstract

The invention discloses a subway covered top-down excavation structure and a construction method thereof. The subway covered top-down excavation structure comprises a supporting pile, wherein the topof the supporting pile is fixedly connected with a supporting plate, a fixing hole is formed in the surface of the supporting plate, the inner wall of the fixing hole is in threaded connection with aconnecting piece, the surface of the connecting piece is in threaded connection with an inner cavity of a roof, a sand outlet is formed in the surface of the roof, the top of the roof is fixedly connected with a guardrail, and the surface of the supporting pile is in bolted connection with a first connecting plate. According to the subway covered top-down excavation structure, by arrangement of the connecting piece, the supporting pile and the roof are connected more stably, and thus, the supporting pile is not inclined or staggered during use; and the supporting contact area of the roof is increased, so that the supporting load of the roof is increased, the load capacity of the whole reinforcing system is enhanced, even if large machinery operates above the roof, enough supporting force can be provided, and the construction safety is guaranteed.

Description

technical field [0001] The invention relates to the technical field of subway cover excavation, in particular to a subway cover excavation inversion structure and a construction method thereof. Background technique [0002] The cover-and-excavation method is to build the enclosure structure and intermediate piles of the foundation pit downward on the ground surface. Like the cover-excavation method, the enclosure structure of the foundation pit mostly adopts underground diaphragm walls or curtain piles, and the intermediate support mostly uses the main structure itself. The middle column can be used to reduce the project cost, and then the surface soil can be excavated to the ground level of the roof of the main structure, and the unexcavated soil can be used as a soil mold to pour the roof. The roof can be used as a strong horizontal brace to prevent The structure is deformed into the foundation pit. After backfilling, the road will be restored to restore traffic. To transp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/055
CPCE02D29/055E02D2600/20
Inventor 李群平田建伟王宁波邹超吴鑫李龙伟安慧郭肖飞安欢欢郭世豪胡鹏举高勇强
Owner CHINA RAILWAY FIRST GRP CO LTD
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