Soft soil foundation deep foundation pit supporting structure

Abstract

The utility model relates to the technical field of foundation pit supporting, in particular to a soft soil foundation deep foundation pit supporting structure which comprises a plurality of soil retaining plates, a plurality of connecting pieces, a plurality of fixing bases and a plurality of supporting beams, the soil retaining plates are arranged adjacent to the side wall of a foundation pit, one end of the first soil retaining plate is connected with one end of the connecting piece, and the other end of the first soil retaining plate is connected with the other end of the connecting piece. One end of the connecting piece is connected with one end of the first breast board, the other end of the connecting piece is connected with one end of the second breast board, the bottom of the connecting piece is connected with the fixed base, the fixed base is fixed in a foundation, and the supporting beam is connected with the two breast boards which are arranged in parallel. The supporting structure overcomes the defects in the prior art, the fixing base is connected with the connecting piece, the fixing base is fixed in the foundation, the bottom of the connecting piece is fixed more stably, and the situation that the bottom of the connecting piece topples over and the supporting structure is damaged when soft soil on the side wall of the foundation pit outside the soil retaining plate collapses is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit support, in particular to a deep foundation pit support structure for soft soil foundation. Background Technique

[0002] Deep foundation pit support refers to the measures of retaining, strengthening and protecting the side wall of a deep foundation pit and the surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. Deep foundation pit support is an important structure to ensure the safety of deep foundation pit operation, which is directly related to the project safety and the personal safety of relevant operators. The deep foundation pit support in the prior art can be divided into cast-in-situ support that requires on-site casting of pile drivers, retaining walls, etc., or a retaining structure combined with piles, plates, etc. For soft soil foundations, due to the high process difficulty, high cost and long construction period of cast-in-situ pile and wall construction, the method of directly erecting a retaining structure is generally selected. However, in the prior art, in order to ensure the connection stability, a complex fastening structure is mostly used to connect adjacent two retaining plates, which results in that the adjacent two retaining plates can only be inserted into each other from the top, and a crane is required for on-site splicing, and workers need to accurately guide the lifted retaining plate through a towing rope to complete the top-down splicing, and it is impossible to install from the front inside the foundation pit, resulting in low connection efficiency and very slow project progress.

[0003] Chinese Patent: CN210216457U discloses a deep foundation pit support structure for soft soil foundation, which includes a number of soil retaining devices sequentially distributed on the side wall of the foundation pit. The soil retaining device includes a soil retaining plate and side plates fixed at both ends of the soil retaining plate, and the side plates are perpendicular to the soil retaining plate; adjacent two soil retaining devices are connected by a connecting piece, and two grooves with open sides are arranged on the connecting piece, and two opposite side plates on adjacent two soil retaining devices are respectively inserted into the two grooves; the connecting piece is located on the side of the soil retaining plate facing the side wall of the foundation pit, and a number of horizontally distributed convex platforms are fixed on the side of the soil retaining plate facing the center of the foundation pit, and a stiffening beam is fixed on the convex platform. However, with such a setting, the bottom area of the soil retaining device is relatively large, and it cannot be fixed and inserted below the ground, and the overall structural stability is insufficient. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a deep foundation pit support structure for soft soil foundation, which overcomes the deficiencies of the prior art and aims to solve the problems that the assembled soil retaining device in the prior art has a relatively large bottom area, cannot be fixed and inserted below the ground, and the overall structural stability is insufficient.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a deep foundation pit support structure on a soft soil foundation, comprising a retaining plate, a connecting member, a fixed base and a support beam, wherein the retaining plate, the connecting member and the fixed base are each provided in plurality, the retaining plate is provided adjacent to the side wall of the foundation pit, one end of the first retaining plate is connected to one end of the connecting member, the other end of the connecting member is connected to one end of the second retaining plate, the bottom of the connecting member is connected to the fixed base, the fixed base is fixed in the foundation, and the support beam connects the two retaining plates provided in parallel.

[0006] During operation, the fixed base is first installed in the foundation according to the drawing to ensure that the upper surface of the fixed base is flush with the foundation surface, and then the connecting parts are placed on the fixed base, and the retaining plates are installed in sequence to connect the connecting parts, and finally the support beam is connected to the two retaining plates arranged in parallel.

[0007] As a preferred technical solution of the present utility model, the cross-section of the retaining plate is an I-shape, and the retaining plate includes a first flange and a second flange. The first flange of the first retaining plate is connected to the first slot of the connecting member, the second slot of the connecting member is connected to the second flange of the second retaining plate, and the bottom of the connecting member is connected to the limiting slot of the fixed base.

[0008] As a preferred technical solution of the present utility model, the connecting member is a mountain-shaped structure, the bottom of the connecting member cooperates with the limiting groove to limit the displacement of the connecting member, the fixed base includes a first limiting plate, a second limiting plate and a base body, the first limiting plate and the second limiting plate are arranged parallel to the upper surface of the base body, the first limiting plate is connected to the first slot, the second limiting plate is connected to the second slot, and the base body is arranged in the foundation.

[0009] As a preferred technical solution of the present utility model, the cross-section of the base body is a triangle, and the first limiting plate and the second limiting plate are welded to the bottom surface of the base body.

[0010] As a preferred technical solution of the utility model, the web of the first retaining plate is connected to a group of support rods, a stiffening beam is placed on the support rods, the stiffening beam is connected to one end of the support beam, and the other end of the support beam is connected to the web of the third retaining plate, and the third retaining plate is arranged parallel to the first retaining plate.

[0011] As a preferred technical solution of the utility model, the stiffening beam is an I-beam, the web of the stiffening beam is placed on the support rod perpendicular to the web of the first retaining plate, and the flange of the stiffening beam is connected to the connecting part of the support beam.

[0012] As a preferred technical solution of the present utility model, the connecting part is clamped and connected with the flange of the stiffening beam.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The fixed base provided by the present utility model is connected with the connecting piece, and the fixed base is fixed in the foundation, so that the bottom of the connecting piece is fixed more firmly, avoiding the bottom of the connecting piece from toppling when the soft soil on the side wall of the foundation pit outside the retaining plate collapses, and the supporting structure is damaged. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0016] Figure 2 is a cross-sectional view of the present utility model;

[0017] Figure 3 is a right view of the present utility model;

[0018] Figure 4 is a schematic diagram of the structure of the placement seat of the present utility model;

[0019] Figure 5 is a schematic diagram of the structure of the cover of the present utility model;

[0020] In the figure: 1, retaining plate; 101, first retaining plate; 102, second retaining plate; 103, first flange; 104, second flange; 105, third retaining plate; 2, connecting piece; 201, first card slot; 202, second card slot; 3, fixed base; 301, limiting slot; 302, first limiting plate; 303, second limiting plate; 304, base body; 4, support beam; 401, connecting part; 5, support rod; 6, stiffening beam. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figures 1-5The utility model provides the following technical solutions: a deep foundation pit support structure on a soft soil foundation, comprising: a retaining plate 1, a connecting member 2, a fixed base 3 and a support beam 4. The retaining plate 1, the connecting member 2 and the fixed base 3 are all provided in plurality. The retaining plate 1 is provided adjacent to the side wall of the foundation pit. One end of the first retaining plate 101 is connected to one end of the connecting member 2, and the other end of the connecting member 2 is connected to one end of the second retaining plate 102. The bottom of the connecting member 2 is connected to the fixed base 3, and the fixed base 3 is fixed in the foundation. The support beam 4 connects two retaining plates 1 provided in parallel.

[0023] During operation, first install the fixed base 3 in the foundation according to the drawing, ensure that the upper surface of the fixed base 3 is flush with the foundation surface, then place the connecting piece 2 on the fixed base 3, install the retaining plates 1 in sequence to connect each connecting piece 2, and finally connect the support beam 4 to the two retaining plates 1 arranged in parallel.

[0024] The fixed base 3 is connected to the connecting member 2 and fixed in the foundation, so that the bottom of the connecting member 2 is more firmly fixed, thereby preventing the bottom of the connecting member 2 from tipping over when the soft soil on the side wall of the foundation pit outside the retaining plate 1 collapses, thereby damaging the supporting structure.

[0025] Specifically, the retaining plate 1 has an I-shaped cross section, and includes a first flange 103 and a second flange 104. The first flange 103 of the first retaining plate 101 is connected to the first clamping groove 201 of the connecting member 2, the second clamping groove 202 of the connecting member 2 is connected to the second flange 104 of the second retaining plate 102, and the bottom of the connecting member 2 is connected to the limiting groove 301 of the fixed base 3. The retaining plate 1 is arranged in this way so that the structure is simple and easy to process. The connection between the retaining plate 1 and the connecting member 2 adopts a clamping structure, which is convenient for disassembly and installation, and helps to improve the installation efficiency of the support structure.

[0026] Specifically, the connecting member 2 is a mountain-shaped structure, the bottom of the connecting member 2 cooperates with the limiting groove 301 to limit the displacement of the connecting member 2, and the fixed base 3 includes a first limiting plate 302, a second limiting plate 303 and a base body 304. The first limiting plate 302 and the second limiting plate 303 are arranged in parallel on the upper surface of the base body 304, the first limiting plate 302 is connected to the first clamping groove 201, the second limiting plate 303 is connected to the second clamping groove 202, and the base body 304 is arranged in the foundation. The connecting member 2 and the fixed base 3 are arranged in this way, so that the connection is reliable, the overall stability of the support structure is improved, it is helpful to reduce the difficulty of parts processing, improve the interchangeability of parts, and reduce production costs.

[0027] Specifically, the cross section of the base body 304 is triangular, and the first limiting plate 302 and the second limiting plate 303 are welded to the bottom surface of the base body 304. Such a configuration of the base body 304 helps to reduce the workload of foundation digging, improve the installation efficiency of the support structure, and improve the stability of the device.

[0028] Specifically, the web of the first retaining plate 101 is connected to a group of support rods 5. A stiffening beam 6 is placed on the support rods 5. One end of the stiffening beam 6 is connected to the support beam 4, and the other end of the support beam 4 is connected to the web of the third retaining plate 105. The third retaining plate 105 is arranged parallel to the first retaining plate 101. By setting the connection mode of the stiffening beam 6 and the first retaining plate 101 in this way, the connection and installation of the stiffening beam 6 and the baffle 1 are fast, improving the installation speed.

[0029] Specifically, the stiffening beam 6 is an I-beam. The web of the stiffening beam 6 is placed perpendicular to the web of the first retaining plate 101 on the support rods 5, and the flange of the stiffening beam 6 is connected to the connecting part 401 of the support beam 4. By setting the structure of the stiffening beam 6 in this way, it is easy to process, the materials are convenient to obtain, and the stiffness of the support rods 5 is improved, which helps to improve the overall stability and reliability of the support structure.

[0030] Specifically, the connecting part 401 is clamped and connected to the flange of the stiffening beam 6. By setting the connecting part 401 in this way, the support beam 4 and the stiffening beam 6 are convenient to disassemble, reducing the installation and disassembly time, improving the installation speed, and helping to reduce the production cost.

[0031] Working principle: During operation, first install the fixed base 3 in the foundation according to the drawing, ensure that the upper surface of the fixed base 3 is flush with the foundation surface, then place the connecting piece 2 on the fixed base 3, install the retaining plates 1 in sequence to connect the respective connecting pieces 2, and finally connect the support beam 4 to the two parallel retaining plates 1.

[0032] Finally, it should be noted that in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Deep foundation pit support structure for soft soil foundation, characterized by: A retaining plate (1), a connecting member (2), a fixed base (3) and a support beam (4), wherein the retaining plate (1), the connecting member (2) and the fixed base (3) are all provided in plurality, the retaining plate (1) is provided adjacent to the side wall of the foundation pit, one end of the first retaining plate (101) is connected to one end of the connecting member (2), the other end of the connecting member (2) is connected to one end of the second retaining plate (102), the bottom of the connecting member (2) is connected to the fixed base (3), the fixed base (3) is fixed in the foundation, and the support beam (4) connects the two retaining plates (1) provided in parallel; The retaining plate (1) has an I-shaped cross section and comprises a first flange (103) and a second flange (104); the first flange (103) of the first retaining plate (101) is connected to a first clamping groove (201) of the connecting member (2); the second clamping groove (202) of the connecting member (2) is connected to the second flange (104) of the second retaining plate (102); and the bottom of the connecting member (2) is connected to a limiting groove (301) of the fixed base (3).

2. The deep foundation pit support structure for soft soil foundation according to claim 1 is characterized in that: The connecting member (2) is a mountain-shaped structure, the bottom of the connecting member (2) cooperates with the limiting groove (301) to limit the displacement of the connecting member (2), the fixed base (3) comprises a first limiting plate (302), a second limiting plate (303) and a base body (304), the first limiting plate (302) and the second limiting plate (303) are arranged in parallel on the upper surface of the base body (304), the first limiting plate (302) is connected to the first clamping groove (201), the second limiting plate (303) is connected to the second clamping groove (202), and the base body (304) is arranged in the foundation.

3. The deep foundation pit support structure for soft soil foundation according to claim 2 is characterized in that: The cross section of the base body (304) is triangular, and the first limiting plate (302) and the second limiting plate (303) are welded to the bottom surface of the base body (304).

4. The deep foundation pit support structure for soft soil foundation according to claim 3 is characterized in that: The web of the first retaining plate (101) is connected to a group of support rods (5), a stiffening beam (6) is placed on the support rod (5), the stiffening beam (6) is connected to one end of the support beam (4), the other end of the support beam (4) is connected to the web of the third retaining plate (105), and the third retaining plate (105) is arranged parallel to the first retaining plate (101).

5. The deep foundation pit support structure for soft soil foundation according to claim 4 is characterized in that: The stiffening beam (6) is an I-beam, the web of the stiffening beam (6) is placed on the support rod (5) perpendicular to the web of the first retaining plate (101), and the flange of the stiffening beam (6) is connected to the connecting portion (401) of the support beam (4).

6. The deep foundation pit support structure for soft soil foundation according to claim 5 is characterized in that: The connecting portion (401) is snap-connected to the flange of the stiffening beam (6).

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