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Construction method of foundation pit cover plate and support system

A construction method and a cover technology, which are applied in basic structure engineering, excavation, construction, etc., can solve the problems of low mechanical operation rate, high construction cost, long construction period, etc., achieve short construction period and improve resistance to earthwork extrusion Ability, effect of high degree of mechanization

Pending Publication Date: 2021-04-16
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a foundation pit cover plate support for the existing large-span cover plate construction using manual erection, involving high-altitude operations, high risk, low mechanical operation rate, high construction cost, and long construction period. Protection system construction method

Method used

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  • Construction method of foundation pit cover plate and support system
  • Construction method of foundation pit cover plate and support system
  • Construction method of foundation pit cover plate and support system

Examples

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Embodiment 1

[0039] as attached figure 1 , attached figure 2 And attached image 3 This embodiment shows a construction method for foundation pit cover and support system. As an important auxiliary construction component in the construction process of a subway station, the cover has high quality requirements. The main uses of the cover are stacking materials, traffic passage, Cranes, pump trucks, and earthwork trucks are parked. For foundation pits with a length greater than 535.5m and a width of 71.4m to 80m, the construction load is considered to be a uniform load of 20kPa, and the thickness of the reinforced concrete cover 1 is 350mm. Double-layer two-way C25@150 Main tendon.

[0040] Under the action of a uniformly distributed load of 20kpa, the maximum bending moment and shear force of the first reinforced concrete support 2 under the reinforced concrete cover plate 1 reach 1248 kN m at the mid-span, and 2475 kN at the support m, the maximum shear force value reaches 684 kN. Acco...

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Abstract

The invention relates to the technical field of building equipment, and particularly relates to a construction method of a foundation pit cover plate and a support system. The construction method comprises the following steps that 1) surveying and setting out and earth excavation are conducted; 2) supporting frame binding and formwork mounting are conducted; 3) earth backfilling is conducted; 4) cover plate cushion layer pouring is conducted; 5) cover plate support body binding is conducted; and 6) supporting frame body and cover plate support body pouring is conducted, a construction operation plane made by manually erecting a support formwork system is replaced, and finally cover plate support body binding and supporting frame body and cover plate support body pouring are conducted on a cover plate cushion layer. During whole construction, construction machinery can be used for backfilling earth to serve as the construction operation plane to replace manual support erecting to act on a construction bearing body, the whole process is high in mechanization degree, the construction period is short, and the problems that during existing large-span cover plate construction, manual support erecting is adopted, high-altitude operation is involved, the risk is large, the mechanical operation rate is low, the construction cost is high, and the construction period is long are solved.

Description

technical field [0001] The invention relates to the technical field of subway construction, in particular to a construction method for a foundation pit cover plate and a support system. Background technique [0002] The length of the foundation pit of an ordinary subway station is 200-300m, the width is 18-22m, and the depth is 16-20m. Because the span is small, there is no requirement for heavy stacking materials and traffic, so the enclosure structure only adopts concrete support and steel The support can be combined, and there is no need to set a cover plate on the concrete support and steel support. However, for the subway station with a foundation pit length greater than 400m and a width greater than 50m, because of the large span, the enclosure structure is supported by three reinforced concrete trusses and placed in the Covers are set in the first support part for stacking heavier materials and for traffic. [0003] Conventionally, the construction of the full hall s...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D17/04E02D15/02
Inventor 刘家驹熊开勇徐天良李林栖刘成谢磊谢超
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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