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Prestressed system fabricated underground structure and construction method thereof

An underground structure and prefabricated technology, used in underwater structures, infrastructure engineering, structural elements, etc., can solve the problem that the bolt connection cannot effectively transmit the bending moment, the number of sleeve connection sleeves is large, and the sleeve pre-embedding accuracy requirements High-level problems, to solve the problem of labor shortage, significant social and economic benefits, and reduce on-site labor intensity

Pending Publication Date: 2021-07-09
瀚阳国际工程咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The bolted connection cannot effectively transmit the bending moment, and the joints are easy to crack and leak
[0004] 2. Sleeve connection The number of sleeves is large, the hole is small, the precision of the sleeve embedded is high, and the connection is difficult
[0005] 3. Post-cast concrete connection requires on-site welding of steel bars or steel plates between components, and post-cast strips are poured on-site. The working environment of the underground structure is poor, and the welding quality is difficult to guarantee. Post-cast concrete is difficult to vibrate, difficult to compact, and easy to crack and leak
Its main disadvantage is that it needs to be poured on site, and its economic applicability is low

Method used

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  • Prestressed system fabricated underground structure and construction method thereof
  • Prestressed system fabricated underground structure and construction method thereof
  • Prestressed system fabricated underground structure and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] An assembled underground structure of a prestressed system includes an underground enclosure structure and an assembled underground main structure. see figure 1 As shown, the underground enclosure structure includes the underground diaphragm wall 1 on both sides of the foundation pit bottom, the first concrete support 2 supported on the top of the underground diaphragm wall 1 on both sides, and the second concrete support 2 supported on the middle part of the underground diaphragm wall 1 on both sides. The steel support 3 and the third steel support 4 supported on the lower part of the underground diaphragm wall 1 on both sides, wherein the first concrete support 2, the second steel support 3 and the third steel support 4 are temporary support members, the The prefabricated underground main structure is installed and constructed in the underground diaphragm walls 1 on both sides with the support of temporary supporting components. After the construction of the prefabric...

Embodiment 2

[0065] A construction method for an assembled underground structure of a prestressed system comprises the following construction steps.

[0066] S1, construction of underground enclosure structure, using the open cut method to construct the foundation pit, the enclosure structure adopts an underground diaphragm wall 1 with a thickness of 800mm, and the wall width is 6.75m; the first internal support adopts the first concrete support 2 of 900×1000mm, The support spacing is 9m; the second and third lines adopt φ800, t=16mm second steel support 3 and third steel support 4, and the steel support spacing is 4.5m and 2.25m intervals. The foundation pit is excavated and supported as it is excavated layer by layer to the bottom of the foundation pit, and the concrete cushion layer 5, waterproof layer 6, protective layer 7, and elevation fine-tuning layer 8 are constructed.

[0067] S2, assembling the assembled underground main structure in the circumferential direction to form the ann...

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Abstract

The invention discloses a prestressed system fabricated underground structure and a construction method thereof. The prestressed system fabricated underground structure comprises an underground enclosure structure and a fabricated underground main body structure, the underground enclosure structure comprises a temporary supporting component used for supporting an underground diaphragm wall, and the fabricated underground main body structure comprises an annular component formed by connecting prestressed steel beams; and a support changing block is arranged between the annular component and the underground diaphragm wall, and is used for supporting the underground diaphragm wall through the annular component so as to remove the temporary supporting component. According to the prestressed system fabricated underground structure, an innovative vertical support changing system is adopted to solve the conflict problem of assembly and lowering of assembly parts and support in a foundation pit, a main body structure is firstly looped and then is debraced, the looped main body structure can effectively form a rigid hinge, the overall stability and safety of the foundation pit are enhanced, the total section of a component joint is pressed through prestress, bending moment and shearing force can be effectively transmitted, joint sealing and waterproofness are ensured, the integrity is good, and safety and reliability are achieved.

Description

technical field [0001] The invention relates to an assembled underground structure, in particular to the design and construction method of an assembled underground structure with a prestressed system. Background technique [0002] 1. The existing prefabricated underground structure adopts ordinary reinforced concrete structure, and there are three main connection methods: bolt connection, grouting sleeve connection and post-cast concrete connection. [0003] 1. The bolt connection cannot effectively transmit the bending moment, and the joints are easy to crack and leak. [0004] 2. Sleeve connection The number of sleeves is large, the hole is small, the precision of the sleeve embedded is high, and the connection is difficult. [0005] 3. For post-cast concrete connection, on-site welding of steel bars or steel plates is required between components, and post-cast strips are poured on-site. The working environment of the underground structure is poor, and the welding quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/045E02D5/00E04C5/08
CPCE02D5/00E02D29/045E04C5/08
Inventor 孙峻岭魏良甲雷文斌芮斯瑜阳发金徐建根成志勇潘伟光谢文斌邹岩
Owner 瀚阳国际工程咨询有限公司
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