Reinforcing support for foundation pit of soft soil foundation building

Abstract

The utility model relates to the technical field of soft soil foundations, in particular to a reinforcing support for a foundation pit of a soft soil foundation building. The device comprises a bottom plate, a supporting plate hinged to the end of the bottom plate and a supporting rod arranged between the supporting plate and the bottom plate, a plurality of anchoring rods are arranged on the bottom plate and the supporting plate in a penetrating mode, grout outlet holes are formed in the middles of the anchoring rods, grouting channels communicated with the grout outlet holes are formed in the axis directions of the anchoring rods, and the grouting channels are communicated with the grout outlet holes. The upper part of the anchoring rod is fixedly connected with a barrier plate; an expansion assembly used for increasing the contact area with soil is arranged on the outer side of the anchoring rod. According to the device, lime powder or cement paste is sprayed into soft soil through the grouting channel, and the materials are mixed with the soft soil to form a reinforced composite foundation, so that the connection strength between the device and the soil is improved, the stability of the device is improved, and the sinking probability is reduced; the device is convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of soft soil foundation, and specifically relates to a reinforcement and support for a building foundation pit in soft soil foundation. Background Technique

[0002] Soft soil refers to fine-grained soil deposited in coastal areas, lakes, valleys, and river beaches, with high natural water content, large void ratio, high compressibility, and low shear strength. Soft soil has characteristics such as small consolidation coefficient, long consolidation time, high sensitivity, large disturbance, poor water permeability, complex layered distribution of soil layers, and significant differences in physical and mechanical properties between layers. A foundation pit refers to the underground space excavated for the construction of the foundation and basement of a building (including structures). The foundation pit is a temporary project, and its function is to provide a space for the masonry operation of the foundation to be carried out at the designated position according to the design.

[0003] During the excavation process of the foundation pit, it will inevitably cause the deformation of the surrounding soil mass and affect the underground pipelines of the surrounding buildings. Therefore, generally after the foundation pit is excavated, a support structure is required to support the inside of the foundation pit, and the side wall of the foundation pit and the surrounding environment are reinforced and protected to prevent the foundation pit from collapsing and stabilize the safety of the foundation pit.

[0004] Chinese Patent CN202322990194.1 discloses "A Double-Layer Inner Thrown Oblique Brace Foundation Pit Support Structure for Soft Soil Foundation", with the publication number CN221545632U. The device includes a foundation pit, a support plate, a protective frame, a plurality of long inner thrown oblique brace members, and a plurality of short inner thrown oblique brace members. The support plate is fixedly installed on the inner wall of the foundation pit, and a plurality of support rods are arranged on the support plate. However, this device has some defects: due to the relatively soft soil quality of the soft soil foundation, the structural stability of this device is not high enough, the connection strength between the support plate and the soft soil is not high enough, and this device is prone to subsidence, resulting in the instability of the entire support structure. Content of the Utility Model

[0005] In order to solve the problems of the above-mentioned prior art, the utility model provides a reinforcement and support for a building foundation pit in soft soil foundation, which can increase the connection strength between the device and the soil, and further increase the stability of the device.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A reinforcement and support for a building foundation pit in soft soil foundation, including a bottom plate, a support plate hinged at the end of the bottom plate, and a support rod arranged between the support plate and the bottom plate. A plurality of anchor rods are penetrated through both the bottom plate and the support plate. A slurry outlet hole is opened in the middle of the anchor rod, and a slurry injection channel communicating with the slurry outlet hole is opened along the axial direction of the anchor rod. A blocking plate is fixedly connected to the upper part of the anchor rod; an expansion assembly for increasing the contact area with the soil is arranged outside the anchor rod.

[0007] With the above structural design, lime powder or cement slurry is sprayed into the soft soil through the grouting channel. After these materials are mixed with the soft soil, a reinforced composite foundation is formed, thereby increasing the connection strength between the device and the soil and further enhancing the stability of the device.

[0008] Preferably, the expansion assembly includes an expansion cylinder sleeved on the anchor rod, a first expansion rod hinged on the outer wall of the expansion cylinder, a second expansion rod hinged at the lower end of the first expansion rod, and a lifting sleeve hinged at the lower end of the second expansion rod. The lifting sleeve is threadedly sleeved at the lower end of the anchor rod.

[0009] With the above structural design, when the anchor rod is rotated and inserted downward into the soft soil, at the same time the lifting sleeve moves upward, the first expansion rod and the second expansion rod open to form a triangular shape, increasing the resistance to the subsidence of the device. After the lime powder or cement slurry is consolidated on the expansion assembly, the stability of the device is greatly enhanced.

[0010] Preferably, one or more blocks are fixedly connected to the upper end of the expansion cylinder, and slots matching the blocks are provided on both the bottom plate and the support plate.

[0011] With the above structural design, it is prevented that the expansion cylinder rotates along with the anchor rod.

[0012] Preferably, the support rod includes a first support rod, a second support cylinder threadedly sleeved on the upper end of the first support rod, and a third support cylinder threadedly sleeved on the lower end of the first support rod. The second support cylinder is hinged on the support plate, the third support cylinder is hinged on the bottom plate, an auxiliary rod is fixedly connected to the middle of the first support rod, and the threads at the upper end and the lower end of the first support rod have opposite helix directions.

[0013] With the above structural design, the inclination angle of the support plate can be adjusted to be suitable for foundation pits of different standards.

[0014] Preferably, first hinge plates are fixedly connected to the ends of the second support cylinder and the third support cylinder, second hinge plates are fixedly connected to both the bottom plate and the support plate, and hinge bolts penetrate through the first hinge plates and the second hinge plates.

[0015] With the above structural design, the support rod can be detachably installed on the support plate and the bottom plate, which is convenient for disassembly and installation.

[0016] Preferably, a plug plate is fixedly connected to the right end of the support plate, a jack matching the plug plate is provided at the left end of the support plate, and mounting holes are provided on both the plug plate and the left end of the support plate.

[0017] With the above structural design, adjacent support plates can be connected together to increase the overall stability of the device.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] 1) The device sprays lime powder or cement slurry into the soft soil through the grouting channels. After these materials are mixed with the soft soil, a reinforced composite foundation is formed, thereby increasing the connection strength between the device and the soil, further increasing the stability of the device, and further reducing the probability of subsidence.

[0020] 2) The device is convenient for disassembly and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural view of the left side of the present utility model;

[0022] Figure 2 It is a schematic structural view of the front of the present utility model;

[0023] Figure 3 It is a schematic structural view of the expansion assembly of the present utility model; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Please refer to Figure 1 、 Figure 2 、 Figure 3 The present utility model provides a technical solution: a reinforcement and support for a foundation pit of a building on soft soil ground, including a bottom plate 1, a support plate 2 hinged to the end of the bottom plate 1, and a support rod 3 arranged between the support plate 2 and the bottom plate 1. A plurality of anchor rods 4 are penetrated through both the bottom plate 1 and the support plate 2. A slurry outlet hole 41 is opened in the middle of the anchor rod 4, and a grouting channel communicating with the slurry outlet hole 41 is opened along the axial direction of the anchor rod 4. A blocking plate 42 is fixedly connected to the upper part of the anchor rod 4, and the blocking plate 42 is in a disc shape; an expansion assembly for increasing the contact area with the soil is arranged outside the anchor rod 4.

[0025] The expansion assembly includes an expansion cylinder 51 sleeved on the anchor rod 4, a first expansion rod 52 hinged to the outer wall of the expansion cylinder 51, a second expansion rod 54 hinged to the lower end of the first expansion rod 52, and a lifting sleeve 53 hinged to the lower end of the second expansion rod 54. The lifting sleeve 53 is threadedly sleeved on the lower end of the anchor rod 4. A plurality of groups of the first expansion rod 52 and the second expansion rod 54 are arranged and are arranged in a ring outside the anchor rod 4.

[0026] One or more clamping blocks 59 are fixedly connected to the upper end of the expansion cylinder 51, and clamping grooves matching the clamping blocks 59 are opened on both the bottom plate 1 and the support plate 2.

[0027] The support rod 3 includes a first support rod 21, a second support cylinder 22 threadedly sleeved on the upper end of the first support rod, and a third support cylinder 23 threadedly sleeved on the lower end of the first support rod. The second support cylinder 22 is hinged to the support plate 2, and the third support cylinder 23 is hinged to the bottom plate 1. An auxiliary rod 24 is fixedly connected to the middle of the first support rod 21, and the thread directions of the upper end thread and the lower end thread of the first support rod 21 are opposite.

[0028] Both ends of the second support cylinder 22 and the third support cylinder 23 are fixedly connected with a first hinge plate 61, and second hinge plates 62 are fixedly connected to both the bottom plate 1 and the support plate 2. A hinge bolt 63 penetrates through the first hinge plate 61 and the second hinge plate 62.

[0029] Receiving grooves 8 matching the second hinge plates 62 are provided on both the support plate 2 and the bottom plate 1.

[0030] A plug plate 71 is fixedly connected to the right end of the support plate 2, a jack 72 matching the plug plate 71 is provided at the left end of the support plate 2, and mounting holes 73 are provided on both the plug plate 71 and the left end of the support plate 2.

[0031] When the device is in use, in the first step, the staff first unfolds the support plate 2 and the bottom plate 1, and then the staff uses the hinge bolt 63 to install the second support cylinder 22 on the second hinge plate on the support plate 1 and install the third support cylinder 23 on the bottom plate 1.

[0032] In the second step, the staff holds the auxiliary rod 24 and rotates the auxiliary rod 24. The first support rod 21 rotates accordingly, and the second support cylinder 22 and the third support cylinder 23 move relatively away. Finally, the support plate 2 is attached to the side wall of the foundation pit, the plug plate 71 is inserted into the adjacent support plate, and then ground nails are driven into the mounting holes.

[0033] In the third step, the staff first inserts the anchoring rod 4 into the expansion assembly, and then inserts the expansion assembly into the support plate 2 and the bottom plate 1. After inserting the anchoring rod 4 and the expansion assembly into the soft soil, the staff rotates the blocking plate 42 on the anchoring rod 4. The anchoring rod 4 rotates, and the lifting sleeve 53 threadedly sleeved on the lower end of the anchoring rod 4 moves upward. The hinge points of the first expansion rod 52 and the second expansion rod 54 open outward, and the first expansion rod 52 and the second expansion rod 54 form a triangular shape.

[0034] In the fourth step, the staff uses the spraying device to connect the grouting channel on the anchoring rod 4, and the cement slurry is sprayed into the soft soil from the slurry outlet hole 41. After the cement slurry is mixed and consolidated with the soft soil, a reinforced composite foundation is formed, thereby increasing the connection strength between the device and the soil and further increasing the stability of the device.

[0035] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the conditions for the implementation of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model.

[0036] The present utility model has been described with reference to the preferred embodiments, but the protection scope of the present utility model is not limited thereto. All technical solutions falling within the scope of the claims are within the protection scope of the present utility model. Without departing from the scope of the present utility model, various improvements can be made to it and components therein can be replaced with equivalents. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A reinforcement and support for a building foundation pit on soft soil ground, comprising a bottom plate (1), a support plate (2) hinged to the end of the bottom plate (1), and a support rod (3) arranged between the support plate (2) and the bottom plate (1), characterized in that: A plurality of anchor rods (4) are passed through both the bottom plate (1) and the support plate (2). A slurry outlet hole (41) is formed in the middle of the anchor rod (4), and a grouting channel communicating with the slurry outlet hole (41) is formed along the axial direction of the anchor rod (4). A blocking plate (42) is fixedly connected to the upper part of the anchor rod (4); an expansion assembly for increasing the contact area with the soil is arranged outside the anchor rod (4).

2. The reinforcement and support for a building foundation pit on soft soil foundation according to claim 1, characterized in that: The expansion assembly includes an expansion cylinder (51) sleeved on the anchor rod (4), a first expansion rod (52) hinged on the outer wall of the expansion cylinder (51), a second expansion rod (54) hinged at the lower end of the first expansion rod (52), and a lifting sleeve (53) hinged to the lower end of the second expansion rod (54). The lifting sleeve (53) is threadedly sleeved on the lower end of the anchor rod (4).

3. The reinforcement and support for the foundation pit of a building on soft soil foundation according to claim 2, characterized in that: One or more clamping blocks (59) are fixedly connected to the upper end of the expansion cylinder (51), and clamping grooves matching the clamping blocks (59) are formed on both the bottom plate (1) and the support plate (2).

4. A reinforcement and support for a building foundation pit on soft soil foundation according to claim 1, characterized in that: The support rod (3) includes a first support rod (21), a second support cylinder (22) threadedly sleeved on the upper end of the first support rod, and a third support cylinder (23) threadedly sleeved on the lower end of the first support rod (21). The second support cylinder (22) is hinged on the support plate (2), the third support cylinder (23) is hinged on the bottom plate (1), an auxiliary rod (24) is fixedly connected to the middle of the first support rod (21), and the threads at the upper end and the lower end of the first support rod (21) have opposite helix directions.

5. The reinforcement and support for a building foundation pit on soft soil foundation according to claim 4, characterized in that: First hinge plates (61) are fixedly connected to the ends of the second support cylinder (22) and the third support cylinder (23), second hinge plates (62) are fixedly connected to both the bottom plate (1) and the support plate (2), and hinge bolts (63) penetrate through the first hinge plates (61) and the second hinge plates (62).

6. A reinforcement and support for a building foundation pit on soft soil foundation according to any one of claims 1 to 5, characterized in that: A plug plate (71) is fixedly connected to the right end of the support plate (2), a jack (72) matching the plug plate (71) is formed at the left end of the support plate (2), and mounting holes (73) are formed in both the plug plate (71) and the left end of the support plate (2).

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