Prestressed PC construction method combined steel pipe pile foundation pit supporting structure and construction method thereof

A technology of combining steel pipes and supporting structures, which can be used in basic structure engineering, excavation, sheet pile walls, etc., and can solve problems such as extending the construction period and increasing the project cost.

Pending Publication Date: 2021-10-26
SHANGHAI CONSTRUCTION GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the existing PC construction method combined steel pipe pile support structure needs a combined support system to ensure the safety and stability of deep foundation pit engineering construction, which not only increases the project cost, but also prolongs the construction period.

Method used

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  • Prestressed PC construction method combined steel pipe pile foundation pit supporting structure and construction method thereof
  • Prestressed PC construction method combined steel pipe pile foundation pit supporting structure and construction method thereof
  • Prestressed PC construction method combined steel pipe pile foundation pit supporting structure and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] combine Figure 1 to Figure 6 Illustrate the prestressed PC engineering method combined steel pipe pile foundation pit support structure of the present embodiment, it comprises:

[0044] A row of steel pipe piles 10 is composed of a plurality of steel pipe piles 10 arranged at intervals along the excavation surface of the foundation pit, and a fixed end anchor is arranged at the bottom of the row of steel pipe piles 10 near the excavation surface of the foundation pit. Tool 12;

[0045] Multiple Larsen steel sheet piles 20, two adjacent steel pipe piles 10 are locked and connected by a Larsen steel sheet pile 20, that is, the steel pipe piles 10 and Larsen steel sheet piles 20 are connected alternately in turn to form a whole steel continuous wall body;

[0046] The top beam 40 is horizontally arranged on the top of a row of steel pipe piles 10;

[0047] A plurality of prestressed steel strands 30, one end of the prestressed steel strands 30 is anchored to the fixed-...

Embodiment 2

[0054] Different from Example 1, as Figure 1 to Figure 4 As shown, the prestressed PC construction method combined steel pipe pile foundation pit support structure also includes a groove 11 vertically arranged in the steel pipe pile 10 on the side close to the excavation surface of the foundation pit, and the cross section of the groove 11 is "C" It is fixed on the inner wall of the steel pipe pile 10 and together constitutes the vertical channel of the prestressed steel strand 30, the top of the groove 11 is against the top beam 40, the bottom of the groove 11 is against the fixed end anchorage 12, and the prestressed steel strand 30 penetrates into the groove 11, which can avoid the adverse effect of the soil on the prestressed steel strand 30 during the construction of the steel pipe pile 10.

[0055] Please continue to refer figure 1 with Figure 4 , the fixed end anchor 12 is a steel plate set at an angle with the inner wall of the steel pipe pile 10, the thickness of ...

Embodiment 3

[0058] combine Figure 7 to Figure 9 Illustrate the prestressed PC construction method combined steel pipe pile foundation pit support structure of this embodiment, which is different from Embodiments 1 and 2 in that it includes:

[0059] Two rows of steel pipe piles 10 arranged in parallel and at intervals are the first row of steel pipe piles close to the excavation surface of the foundation pit, and the second row of steel pipe piles away from the excavation surface of the foundation pit;

[0060] A plurality of Larsen steel sheet piles 20, two adjacent steel pipe piles 10 in the first row of steel pipe piles are locked and connected by at least one Larsen steel sheet pile 20, that is, the steel pipe piles 10 and Larsen steel sheet piles 20 are connected alternately in sequence. An integral steel continuous wall, each steel pipe pile 10 is provided with a fixed end anchor 12 at the bottom of the inner wall on the side close to the foundation pit;

[0061] Two capping beams...

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Abstract

The invention discloses a prestressed PC construction method combined steel pipe pile foundation pit supporting structure and a construction method thereof, relates to the technical field of geotechnical engineering foundation pit supporting, and aims at the problems that an existing PC construction method combined steel pipe pile supporting structure needs to be combined with a supporting system to be used, the construction cost is increased, and the construction period is prolonged. The structure comprises at least one row of steel pipe piles which are arranged in parallel at intervals; fixed end anchorage devices are arranged at the bottoms of the inner walls of the row of steel pipe piles close to the excavation surface of a foundation pit; every two adjacent steel pipe piles are connected through at least one Larsen steel sheet pile in a buckled mode; capping beams are arranged at the tops of each row of steel pipe piles; and one end of a prestressed steel strand is anchored to the fixed end anchorage device, and the other end is anchored to the coping beam. According to the construction method, the adjacent steel pipe piles are connected through the Larsen steel sheet piles in a buckled mode, the capping beams are constructed at the tops of the steel pipe piles, sleeves are pre-buried, the prestressed steel strands are tensioned, the top ends of the steel pipe piles are anchored to the soil facing side of the capping beam, after construction of the underground structure is completed, the steel pipe piles and the Larsen steel sheet piles are pulled out, and gaps are filled through grouting.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering foundation pit support, in particular to a foundation pit support structure combined with a prestressed PC construction method and a construction method thereof. Background technique [0002] In recent years, with the acceleration of urbanization and the increasing development and utilization of underground space, land use has become increasingly tight, the depth of foundation pits has become deeper and deeper, and the construction space of foundation pit support structures has become more and more limited. The construction requirements for the foundation pit support structure are getting higher and higher, not only to meet the safety during the excavation of deep foundation pits, but also to shorten the construction period and realize green construction. [0003] At present, the commonly used foundation pit support structures include steel sheet piles, engineering piles, bored pi...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D5/28E02D5/58E02D5/06E02D5/08E02D19/18
CPCE02D17/04E02D5/285E02D5/58E02D5/06E02D5/08E02D19/18E02D2250/0046
Inventor 颜超钟铮张竹庭林杰史苏清
Owner SHANGHAI CONSTRUCTION GROUP
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