Support-free vertical prestress foundation pit support

Abstract

The utility model discloses a support-free vertical prestress foundation pit support, and relates to the technical field of deep foundation pit support construction, the foundation pit support comprises a plurality of groups of first support piles and foundation pit slope earthwork, the first support piles are vertically arranged at the edge part of the foundation pit slope earthwork; a pre-stressed anchor cable used for improving the bending resistance and the bearing capacity of the first supporting pile is arranged in the first supporting pile. The first support pile extends into the grouting solidification soil through the bottom end of the pre-stressed anchor cable, so that the pre-stressed anchor cable penetrates into the bottom of the foundation pit slope earthwork, and the pre-stressed anchor cable penetrates into the foundation pit slope earthwork to be anchored and then applies vertical pre-stress. And therefore, the bending resistance and the bearing capacity of the support pile are improved, and the support pile can better resist the soil pressure on one side of the foundation pit.

Description

Technical Field

[0001] The utility model relates to the technical field of deep foundation pit support construction, in particular to a support-free vertical prestressed foundation pit support. Background Art

[0002] With the increasing development of high-rise buildings and underground structures, the depth and scale of deep foundation pits are also constantly developing, and the urban development environment is becoming increasingly complex, with higher and higher requirements for the surrounding environment. At present, the main support forms for deep foundation pits include gravity retaining walls, soil nail wall support, pile support, underground continuous wall support, internal support support, anchor pile support and other common support forms. Among them, the pile support has a wider adaptability in deep foundation pit support, but the pile support has weak control over the horizontal displacement of the foundation pit and poor force distribution.

[0003] Based on this, a support-free vertical prestressed foundation pit support is now provided, which can eliminate the disadvantages of the existing devices. Utility Model Content

[0004] The utility model aims to provide a support-free vertical prestressed foundation pit support to solve the problem that the pile row support in the background technology has weak control over the horizontal displacement of the foundation pit and poor force distribution.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A support-free vertical prestressed foundation pit support includes first support piles and foundation pit slope earthwork, multiple groups of the first support piles are vertically arranged at the edge of the foundation pit slope earthwork, and prestressed anchor cables are arranged inside the first support piles to increase their bending resistance and bearing capacity.

[0007] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In an optional solution: a connecting column is fixedly connected to one side of the first supporting pile.

[0009] In an optional solution, the connecting column is composed of a group of 6 cement mixing piles.

[0010] In an optional solution: a second supporting pile is fixedly connected to one side of the connecting column.

[0011] In an optional solution: the second supporting piles are composed of steel sections and cement mixing piles.

[0012] In an optional solution: the steel sections are arranged on the second supporting piles at intervals.

[0013] In an optional solution: grouting solidified soil is provided on one side of the bottom of the foundation pit slope earthwork.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] The utility model extends the first supporting pile into the grouting solidified soil through the bottom end of the prestressed anchor cable, so that the prestressed anchor cable penetrates into the bottom of the foundation pit slope earthwork, and the prestressed anchor cable penetrates into the foundation pit slope earthwork and is anchored and applies vertical prestress. By applying prestress to the anchor cable, the bending resistance and bearing capacity of the supporting pile are increased, so that the supporting pile can better resist the soil pressure on one side of the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the structure of the first supporting pile and the prestressed anchor cable matching each other in the utility model.

[0018] Figure 3 It is a schematic diagram of the structure of the first supporting pile and the connecting column of the utility model.

[0019] Figure 4 It is a schematic diagram of the structure of the cooperation between the foundation pit slope earthwork and the grouting solidified soil of the utility model.

[0020] Notes on the accompanying figures: 1. The first supporting pile; 2. The earthwork of the foundation pit slope; 3. The prestressed anchor cable; 4. The connecting column; 5. The second supporting pile; 6. The steel section; 7. The grouting to solidify the soil. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] In one embodiment, Figure 1-Figure 4 As shown, a support-free vertical prestressed foundation pit support includes a first supporting pile 1 and foundation pit slope earth 2. Multiple groups of the first supporting piles 1 are vertically arranged on the edge of the foundation pit slope earth 2. The interior of the first supporting pile 1 is provided with a prestressed anchor cable 3 for increasing its bending resistance and bearing capacity. The first supporting pile 1 composed of a cement mixing pile and a prestressed anchor cable 3 can better resist the soil pressure on one side of the foundation pit.

[0023] In one embodiment, Figure 1 As shown, a connecting column 4 is fixedly connected to one side of the first supporting pile 1 .

[0024] In one embodiment, Figure 3 As shown, the connecting column 4 is composed of a group of 6 cement mixing piles, which are used to connect the first supporting pile 1 and the second supporting pile 5 into one.

[0025] In one embodiment, Figure 2 As shown, a second supporting pile 5 is fixedly connected to one side of the connecting column 4 .

[0026] In one embodiment, Figure 2 As shown, the second supporting pile 5 is composed of a steel section 6 and a cement mixing pile, and is used to enhance the strength of the second supporting pile 5 .

[0027] In one embodiment, Figure 2 As shown, the steel sections 6 are arranged one by one on the second supporting piles 5, which can save materials.

[0028] In one embodiment, Figure 4 As shown, a grouting solidified soil 7 is provided on one side of the bottom of the foundation pit slope earthwork 2. The grouting solidified soil 7 refers to grouting downwards through a steel pipe on the basis of natural soil to achieve the effect of compacting and solidifying the soil, making the soil at the bottom of the foundation pit slope earthwork 2 harder.

[0029] Working principle: The above embodiment discloses a support-free vertical prestressed foundation pit support, wherein, when in use, a first supporting pile 1 is formed by a cement mixing pile and a prestressed anchor cable 3, and then a second supporting pile 5 is formed by a cement mixing pile and a steel section 6. The first supporting pile 1 and the second supporting pile 5 are connected together through a connecting column 4, and then the first supporting pile 1 is extended into the grouting solidified soil 7 through the bottom end of the prestressed anchor cable 3, so that the prestressed anchor cable 3 penetrates into the bottom of the foundation pit slope earthwork 2. After the prestressed anchor cable 3 penetrates into the foundation pit slope earthwork 2 and is anchored, vertical prestress is applied. By applying prestress to the anchor cable, the bending resistance and bearing capacity of the supporting pile are increased, so that it can better resist the soil pressure on one side of the foundation pit.

[0030] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A support-free vertical prestressed foundation pit support, comprising a first support pile (1) and foundation pit slope earthwork (2), wherein a plurality of groups of the first support piles (1) are vertically arranged at the edge of the foundation pit slope earthwork (2), characterized in that: The first support pile (1) is provided with a prestressed anchor cable (3) inside for increasing its bending resistance and bearing capacity.

2. The support-free vertical prestressed foundation pit support according to claim 1 is characterized in that: A connecting column (4) is fixedly connected to one side of the first supporting pile (1).

3. The support-free vertical prestressed foundation pit support according to claim 2 is characterized in that: The connecting column (4) is composed of 6 cement mixing piles.

4. The support-free vertical prestressed foundation pit support according to claim 2 is characterized in that: A second supporting pile (5) is fixedly connected to one side of the connecting column (4).

5. The support-free vertical prestressed foundation pit support according to claim 4 is characterized in that: The second supporting pile (5) is composed of a steel section (6) and a cement mixing pile.

6. The support-free vertical prestressed foundation pit support according to claim 5 is characterized in that: The steel sections (6) are arranged one by one on the second supporting pile (5).

7. The support-free vertical prestressed foundation pit support according to claim 1 is characterized in that: Grouting solidified soil (7) is provided on one side of the bottom of the foundation pit slope earthwork (2).

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