Arched prestressed supporting beam system for supporting deep foundation pit

Abstract

The utility model discloses an arched prestressed support beam system for supporting a deep foundation pit, relates to the technical field of civil engineering, and can solve the problems that the conventional fish-bellied prestressed support beam system at present is generally of a single-layer structure, the stress of a retaining wall is linear, and the stress is not uniform and stable enough. The arched prestressed supporting beam system for supporting the deep foundation pit comprises at least two layers of girders arranged on a retaining wall, an arched supporting beam structure and a supporting column, and the arched supporting beam structure comprises an arched frame and a string assembly used for driving the arched frame to extrude a supporting beam assembly towards one side of the retaining wall; one end of the string assembly is connected to the arched frame, and the other end is arranged on the girth; the supporting beam assembly is horizontally arranged and placed on the supporting columns, one end of the supporting beam assembly abuts against the retaining wall, and the other end of the supporting beam assembly is connected to the arch-shaped supporting beam structure.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering, in particular to an arched prestressed support beam system for deep foundation pit support. Background Art

[0002] There are many types of foundation pit support, and the specific support type is usually selected based on the surrounding construction environment, geological conditions, and hydrological conditions. In order to improve the safety of the foundation pit support retaining wall and prevent the surrounding strata from squeezing the foundation pit support, resulting in lateral displacement of the foundation pit support, a support beam structure is usually constructed after the foundation pit support construction is completed to improve the stability of the foundation pit support.

[0003] At present, in order to improve the safety of foundation pit support retaining walls, concrete cast support beams are usually used. The construction and disassembly process is cumbersome, and the abandoned walls after dismantling are difficult to reuse, and the construction cost is high. In order to solve the problems of high construction cost and inconvenient disassembly, the industry has proposed a solution of using pure steel structure support, which can solve the problems of inconvenient disassembly, high construction cost, and difficult material reuse. However, the support beams of pure steel structure are prone to stress deformation during the support process. In scenarios where the safety level of foundation pit support is high, the support beams of pure steel structure are difficult to meet the use requirements.

[0004] The industry has designed a fish-belly prestressed support beam based on the technical route of pure steel support beam structure to improve its support effect and reduce the lateral displacement of the retaining wall. The prestress provided by the chord beam is used to provide continuous internal pressure for the retaining wall to improve the support effect. However, the existing fish-belly prestressed support beam structure is usually a layered structure. For deep foundation pits with deep depths, the force on the retaining wall is linear, and the force is not uniform and stable. Utility Model Content

[0005] The purpose of this application is to provide an arched prestressed support beam system for deep foundation pit support, which solves the problem that the current conventional fish-belly prestressed support beam system is usually a layered structure, the retaining wall is subjected to linear force, and the force is not uniform and stable enough.

[0006] In order to solve the above technical problems, the utility model adopts the following solutions:

[0007] The present application provides an arched prestressed support beam system for deep foundation pit support, comprising at least two layers of surrounding beams arranged on a retaining wall, an arched support beam structure and support columns, wherein:

[0008] The arched support beam structure includes a radial arch frame and a string assembly for driving the arch frame to squeeze the support beam assembly toward one side of the retaining wall;

[0009] One end of the string assembly is connected to the arch frame, and the other end is arranged on the surrounding beam;

[0010] It also includes a support beam assembly which is horizontally arranged and placed on a support column, one end of which is butted against the retaining wall, and the other end of which is connected to the arched support beam structure.

[0011] Optionally, the support beam assembly includes a horizontally arranged support main beam, and a main beam expansion base arranged at the end of the support main beam;

[0012] The cross-sectional area of ​​the main beam expansion base is larger than the cross-sectional area of ​​the supporting main beam, and the main beam expansion base is arranged on one end of the supporting main beam close to the retaining wall;

[0013] One end of the supporting main beam away from the main beam expansion base is connected to the arch frame.

[0014] Optionally, the cross section of the supporting main beam is I-shaped;

[0015] The shape of the main beam expansion base is any one of a rectangle, a circle, an ellipse, and a regular polygon.

[0016] Optionally, the support beam assembly further includes a support beam and a support beam expansion base, and the support beam expansion base is fixedly connected to one end of the support beam close to the retaining wall;

[0017] One end of the supporting beam away from the retaining wall abuts against the string assembly.

[0018] Optionally, a bracket for supporting the supporting main beam and the supporting side beam is provided on the top of the supporting column, and the bracket is fixedly connected to the top of the supporting column and is slidably connected to the supporting main beam.

[0019] Optionally, the arch frame includes a frame support located in the center, and a plurality of arc-shaped frame rods distributed along the circumference of the frame support;

[0020] The arch frame is installed on the support beam assembly through the frame support;

[0021] The centers of the circles where the arc-shaped poles are located coincide with each other;

[0022] The number of the arc-shaped rack poles is at least four, and the number of the arc-shaped rack poles is an even number;

[0023] The number of the string-tensioning assemblies is the same as the number of the arc-shaped rack rods.

[0024] Optionally, the string tensioning assembly includes a tensioning string and a string tightening device for driving the tensioning string to be tightened, wherein:

[0025] The string tightener is installed on the surrounding beam, one end of the tensioning string is connected to the string tightener, and the other end is fixed to the arc-shaped frame rod of the arch frame.

[0026] Optionally, the arched support beam structure further comprises a plurality of support chord beams, the number of the support chord beams is the same as the number of the arc-shaped frame rods, and the support chord beams are movably connected to one end of the arc-shaped frame rod away from the frame support;

[0027] One end of the support beam assembly away from the retaining wall is connected to the support string beam, and the tensioning string is pressed on the support string beam.

[0028] Optionally, the supporting chord beam is rotatably connected to an end of the arc-shaped frame rod away from the frame support;

[0029] A plurality of notches for installing tensioning strings are arranged on the wall surface of the supporting string beam away from the retaining wall.

[0030] Beneficial effects of the utility model:

[0031] 1. The present application sets a perimeter beam, an arched support beam structure and a support column, as well as a support beam assembly. The arch frame and the string assembly of the arched support beam structure can be used to press the support beam assembly, so that the support beam assembly can press the retaining wall. Since the arch frame is radial, the support beam assembly can be arranged in a star-shaped shape by the radial arch frame, which can avoid the problem of serious faults in the stress area of ​​the retaining wall and improve the uniformity of the stress of the retaining wall, thereby solving the problem that the support beam system is usually a layered structure, the stress on the retaining wall is linear, and the stress is not uniform and stable enough. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the main structure of Example 1 of the present application.

[0033] Figure 2 This is a schematic diagram of the main structure of Example 2 of the present application.

[0034] Figure 3 This is a left-view structural schematic diagram of Example 2 of the present application.

[0035] Explanation of the reference numerals: 1-retaining wall, 2-surrounding beam, 3-supporting column, 31-bracket, 4-arch frame, 41-arc-shaped frame rod, 42-arch center cross knot, 5-string assembly, 51-tensioning string, 52-string tightener, 6-supporting beam assembly, 61-supporting main beam, 62-main beam expansion base, 63-supporting support beam, 64-support beam expansion base, 7-supporting chord beam. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0037] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] Embodiment 1:

[0041] like Figure 1 As shown, this embodiment provides an arched prestressed support beam system for deep foundation pit support, comprising at least two layers of surrounding beams 2 arranged on a retaining wall 1, an arched support beam structure and support columns 3, wherein:

[0042] The arched support beam structure includes an arch frame 4 and a string assembly 5 for driving the arch frame 4 to squeeze the support beam assembly 6 toward one side of the retaining wall 1;

[0043] One end of the string assembly 5 is connected to the arch frame 4, and the other end is arranged on the surrounding beam 2;

[0044] It also includes a support beam assembly 6 which is horizontally arranged and distributed in a star-shaped pattern. The support beam assembly 6 is placed on the support column 3, one end of which abuts against the retaining wall 1, and the other end is connected to the arched support beam structure.

[0045] This embodiment provides a surrounding beam 2, an arched support beam structure and a support column 3, as well as a support beam assembly 6. The arched frame 4 and the string assembly 5 of the arched support beam structure can be used to press the support beam assembly 6, so that the support beam assembly 6 can press the retaining wall 1. Since the arched frame 4 is radial, the support beam assembly 6 can be arranged into a star-shaped shape by the radial arched frame 4, which can avoid the problem of serious faults in the stress-bearing area of ​​the retaining wall 1 and improve the uniformity of the stress on the retaining wall 1, thereby solving the problem that the support beam system is usually a layered structure, the stress on the retaining wall 1 is linear, and the stress is not uniform and stable enough.

[0046] Specifically, in this embodiment, the support beam assembly 6 includes a horizontally arranged support main beam 61, and a main beam expansion base 62 arranged at the end of the support main beam 61;

[0047] The cross-sectional area of ​​the main beam expansion base 62 is larger than the cross-sectional area of ​​the supporting main beam 61, and the main beam expansion base 62 is arranged on one end of the supporting main beam 61 close to the retaining wall 1;

[0048] One end of the supporting main beam 61 away from the main beam expansion base 62 is connected to the arch frame 4. By providing the main beam expansion base 62, the force bearing area of ​​the retaining wall 1 can be increased, and the force uniformity and stability of the retaining wall 1 can be improved. In this embodiment, the supporting main beam 61 and the main beam expansion base 62 are detachably fixedly connected by bolts, and the supporting main beam 61 and the main beam expansion base 62 are both made of steel.

[0049] Specifically, in this embodiment, the cross section of the supporting main beam 61 is I-shaped;

[0050] The shape of the main beam expansion base 62 is any one of a rectangle, a circle, an ellipse, and a regular polygon. In this embodiment, the supporting main beam 61 is made of I-beam, and the shape of the main beam expansion base 62 is a rectangle. The technician can set reinforcing ribs on the supporting main beam 61 and the main beam expansion base 62 as needed. In this embodiment, the shape of the main beam expansion base 62 is a rectangle, and the technician can set it to other shapes such as a circle as needed.

[0051] Specifically, in this embodiment, the support beam assembly 6 further includes a support beam 63 and a support beam expansion base 64, and the support beam expansion base 64 is fixedly connected to one end of the support beam 63 close to the retaining wall 1;

[0052] One end of the support beam 63 away from the retaining wall 1 abuts against the string assembly 5. In this embodiment, the support main beam 61 is arranged at the center, and a plurality of support beams 63 are arranged along the circumference of the support main beam 61. In this embodiment, the support beam 63 and the beam expansion base 64 are made of steel.

[0053] Specifically, in this embodiment, a bracket 31 for supporting the supporting main beam 61 and the supporting supporting beam 63 is provided at the top of the supporting column 3, and the bracket 31 is fixedly connected to the top of the supporting column 3 and is slidably connected to the supporting main beam 61. By providing the bracket 31, the movement resistance of the supporting main beam 61 and the supporting supporting beam 63 after being squeezed by the arched supporting beam structure can be reduced, thereby avoiding reducing the supporting force effect of the supporting main beam 61 and the supporting supporting beam 63 on the surrounding beam 2 due to friction or resistance.

[0054] Specifically, in this embodiment, the arch frame 4 includes a frame support located in the center, and a plurality of arc-shaped frame rods 41 distributed along the circumference of the frame support;

[0055] The arch frame 4 is installed on the support beam assembly 6 through the frame support;

[0056] The centers of the circles where the arc-shaped rack rods 41 are located coincide with each other;

[0057] The number of the arc-shaped rack rods 41 is at least four, and the number of the arc-shaped rack rods 41 is an even number;

[0058] The number of the string tensioning components 5 is the same as the number of the arc-shaped rack rods 41. In this embodiment, the supporting main beam 61 is rotatably connected to the frame support, and the axis of the rotating shaft is horizontally arranged. In this embodiment, the number of the arc-shaped rack rods 41 is four, and the technicians can also set it to six, eight, etc. according to the needs.

[0059] When the number of the arc-shaped poles 41 is six, the surrounding beams 2 are arranged in three layers, and when the number of the arc-shaped poles 41 is eight, the surrounding beams 2 are arranged in four layers.

[0060] Specifically, in this embodiment, the string tensioning assembly 5 includes a tensioning string 51 and a string tightening device 52 for driving the tensioning string 51 to tighten, wherein:

[0061] The string tightener 52 is installed on the surrounding beam 2, one end of the tension string 51 is connected to the string tightener 52, and the other end is fixed to the arc-shaped frame rod 41 of the arch frame 4. In this embodiment, by providing the tension string 51 and the string tightener 52, the string tightener 52 can be used to adjust the tensioning force of the tension string 51, thereby adjusting the squeezing force of the tension string 51 on the arc-shaped frame rod 41, thereby improving the supporting effect on the retaining wall 1.

[0062] Embodiment 2:

[0063] like Figure 2 and Figure 3 As shown, in this embodiment, the arched support beam structure further includes a plurality of support chord beams 7, the number of the support chord beams 7 is the same as the number of the arc-shaped frame rods 41, and the support chord beams 7 are movably connected to one end of the arc-shaped frame rod 41 away from the frame support;

[0064] One end of the support beam assembly 6 away from the retaining wall 1 is connected to the support string beam 7, and the tension string 51 is pressed on the support string beam 7. By providing the support string beam 7, the arc-shaped frame rod 41 of the arch frame 4 can be extended, so that the end of the support beam 63 away from the retaining wall 1 is connected to the support string beam 7, thereby improving the support effect and stability.

[0065] Specifically, in this embodiment, the supporting string beam 7 is rotatably connected to one end of the arc-shaped frame rod 41 away from the frame support;

[0066] A plurality of notches for installing the tensioning chord 51 are provided on the wall surface of the support chord beam 7 away from the retaining wall 1. The notches are provided to facilitate the disassembly and assembly of the tensioning chord 51. In some embodiments, a guide ring for placing the tensioning chord 51 may also be provided.

[0067] The rest of the structure of this embodiment is the same as that of the above-mentioned embodiment 1 and will not be described again here.

[0068] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An arched prestressed support beam system for deep foundation pit support, characterized in that: It comprises at least two layers of surrounding beams (2) arranged on a retaining wall (1), an arched support beam structure and support columns (3), wherein: The arched support beam structure comprises a radially shaped arch frame (4) and a string assembly (5) for driving the arch frame (4) to press the support beam assembly (6) toward one side of the retaining wall (1); One end of the string assembly (5) is connected to the arch frame (4), and the other end is arranged on the surrounding beam (2); It also includes a support beam assembly (6) which is horizontally arranged and placed on the support column (3), one end of which is abutted against the retaining wall (1) and the other end of which is connected to the arched support beam structure.

2. The arched prestressed support beam system for deep foundation pit support according to claim 1, characterized in that: The support beam assembly (6) comprises a horizontally arranged support main beam (61), and a main beam expansion base (62) arranged at the end of the support main beam (61); The cross-sectional area of ​​the main beam expansion base (62) is greater than the cross-sectional area of ​​the supporting main beam (61), and the main beam expansion base (62) is arranged on one end of the supporting main beam (61) close to the retaining wall (1); One end of the supporting main beam (61) away from the main beam expansion base (62) is connected to the arch frame (4).

3. The arched prestressed support beam system for deep foundation pit support according to claim 2, characterized in that: The cross section of the supporting main beam (61) is in an I-shape; The main beam expansion base (62) is in any one of a rectangular, circular, elliptical and regular polygonal shape.

4. The arched prestressed support beam system for deep foundation pit support according to claim 2, characterized in that: The support beam assembly (6) further comprises a support beam (63) and a support beam expansion base (64), wherein the support beam expansion base (64) is fixedly connected to one end of the support beam (63) close to the retaining wall (1); One end of the supporting beam (63) away from the retaining wall (1) abuts against the string assembly (5).

5. The arched prestressed support beam system for deep foundation pit support according to claim 4, characterized in that: A bracket (31) for supporting the supporting main beam (61) and the supporting side beam (63) is provided at the top of the supporting column (3); the bracket (31) is fixedly connected to the top of the supporting column (3) and is slidably connected to the supporting main beam (61).

6. The arched prestressed support beam system for deep foundation pit support according to claim 1, characterized in that: The arch frame (4) comprises a frame support located in the center, and a plurality of arc-shaped frame rods (41) distributed along the circumference of the frame support; The arch frame (4) is installed on the support beam assembly (6) through a frame support; The centers of the circles where the multiple arc-shaped rack rods (41) are located coincide with each other; The number of the arc-shaped rack rods (41) is at least four, and the number of the arc-shaped rack rods (41) is an even number; The number of the string tensioning assemblies (5) is the same as the number of the arc-shaped rack rods (41).

7. The arched prestressed support beam system for deep foundation pit support according to claim 6, characterized in that: The string tensioning assembly (5) comprises a tensioning string (51) and a string tightening device (52) for driving the tensioning string (51) to tighten, wherein: The string tightener (52) is installed on the surrounding beam (2), one end of the tensioning string (51) is connected to the string tightener (52), and the other end is fixed to the arc-shaped frame rod (41) of the arch frame (4).

8. The arched prestressed support beam system for deep foundation pit support according to claim 7, characterized in that: The arched support beam structure further comprises a plurality of support chord beams (7), the number of the support chord beams (7) being the same as the number of the arc-shaped frame rods (41), and the support chord beams (7) being movably connected to one end of the arc-shaped frame rod (41) away from the frame support; One end of the support beam assembly (6) away from the retaining wall (1) is connected to the support string beam (7), and the tensioning string (51) is pressed onto the support string beam (7).

9. The arched prestressed support beam system for deep foundation pit support according to claim 8, characterized in that: The supporting string beam (7) is rotatably connected to an end of the arc-shaped frame rod (41) away from the frame support; A plurality of notches for installing tensioning strings (51) are arranged on the wall surface of the supporting string beam (7) away from the retaining wall (1).

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