Support structure and system for actively controlling displacement of foundation pit

Abstract

The utility model discloses a kind of active control foundation pit displacement's change support structure and system.The change support structure and system include bracket (51), diagonal bracing (52) and elongation force adding device (53);The bracket is based on floor slab;One end of the diagonal bracing is base end, and the other end of diagonal bracing is top support end;The base end of the diagonal bracing is connected with bracket assembly by elongation force adding device, and the top support end of the diagonal bracing is assembled and connected with enclosure structure (1) obliquely upwards;Numerous change support structures are evenly dispersed along enclosure structure.In the construction of change support structure and system is completed, the force degree of top support of elongation force adding device output can be controlled to accurately control the force degree of pre-stress applied to enclosure structure, so as to achieve the effect of dynamically adjusting "pre-stress applied to enclosure structure".In this way, pre-stress can be actively adjusted according to foundation pit deformation, so as to effectively intervene when displacement deformation occurs in enclosure structure.

Description

Technical Field

[0001] This utility model relates to an internal support technology for foundation pits, and more particularly to a replacement support structure and system for actively controlling the displacement of foundation pits. Background Technology

[0002] Excavation of a foundation pit can cause settlement and displacement of the surrounding strata, thus affecting the safety of nearby subway tunnels and buildings. Conventional techniques use bracing to control foundation pit deformation, but these bracings need to be removed during the backfilling of the underground structure. To control the displacement of the retaining structure during the removal of bracing, conventional techniques use methods such as installing inclined bracing, but when deformation occurs, they cannot actively adjust the axial force according to the deformation of the foundation pit, resulting in poor effectiveness.

[0003] In summary, the current problem is:

[0004] 1) Existing support technologies for retaining structures cannot actively adjust prestress according to the deformation of the foundation pit, thus failing to provide effective intervention when the retaining structure undergoes displacement and deformation.

[0005] 2) Currently, there is no device or technology that can actively adjust the prestress according to the deformation of the foundation pit during the dismantling of the supports. Summary of the Invention

[0006] The purpose of this invention is to provide a replacement support structure and system for actively controlling the displacement of a foundation pit. By using this replacement support structure and system to apply dynamically adjustable prestress to the retaining structure, the prestress can be actively adjusted according to the deformation of the foundation pit, thereby effectively intervening when the retaining structure undergoes displacement deformation.

[0007] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0008] A replacement support structure for actively controlling the displacement of a foundation pit includes a floor slab constructed within the pit. The replacement support structure comprises a corbel, diagonal braces, and an extension force-enhancing device. The corbel is based on the floor slab. One end of the diagonal brace is a base end, and the other end is a top support end. The base end of the diagonal brace is connected to the corbel via the extension force-enhancing device, and the top support end of the diagonal brace is connected to the retaining structure at an upward angle.

[0009] Furthermore, the elongation force-adding device is a jack device or an electric telescopic cylinder device.

[0010] Furthermore, an assembly connection base plate is pre-embedded in the enclosure structure, and the top support end of the diagonal brace is assembled and connected to the assembly connection base plate.

[0011] Furthermore, the assembly connection between the extension force-adding device and the corbel, the assembly connection between the diagonal brace and the extension force-adding device, and the assembly connection between the diagonal brace and the enclosure structure adopts flange connection or welding connection.

[0012] Furthermore, the retaining structure is a ground wall, cast-in-place piles, interlocking piles, SMW method piles, or PC method piles.

[0013] Furthermore, the corbel is made of concrete or steel.

[0014] Furthermore, the corbel is made of concrete and is cast together with the floor slab.

[0015] A support replacement system for actively controlling the displacement of a foundation pit, the support replacement system comprising numerous support replacement structures as described above, which are evenly and discretely distributed along the retaining structure.

[0016] Furthermore, the replacement support system also includes a clinometer, which is installed in the retaining structure or in the soil outside the retaining structure.

[0017] Compared with existing technologies, the advantages of the active control foundation pit displacement replacement structure and system of this utility model are as follows:

[0018] After the construction of the replacement support structure and system is completed, the force of the prestress applied to the retaining structure can be precisely controlled by adjusting the supporting force output of the extension force device, thereby achieving the effect of dynamically adjusting the prestress applied to the retaining structure. In this way, the prestress can be actively adjusted according to the deformation of the foundation pit, thus enabling effective intervention when the retaining structure undergoes displacement and deformation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the active control structure and system for foundation pit displacement according to this utility model;

[0020] Figure 2 for Figure 1 A top view at any floor slab in the middle;

[0021] Figure 3 This is a first schematic diagram illustrating the construction process of the replacement support structure and system of this utility model;

[0022] Figure 4 This is a second schematic diagram illustrating the construction process of the replacement support structure and system of this utility model;

[0023] Figure 5 This is the third schematic diagram of the construction process of the replacement support structure and system of this utility model;

[0024] Figure 6This is the fourth schematic diagram of the construction process of the replacement support structure and system of this utility model;

[0025] Figure 7 This is the fifth schematic diagram of the construction process of the replacement support structure and system of this utility model;

[0026] Figure 8 This is the sixth schematic diagram of the construction process of the replacement support structure and system of this utility model;

[0027] Figure 9 The seventh schematic diagram shows the construction process of the replacement support structure and system of this utility model;

[0028] Figure 10 This is the eighth schematic diagram of the construction process of the replacement support structure and system of this utility model;

[0029] Figure 11 This is the ninth schematic diagram illustrating the construction process of the replacement support structure and system of this utility model. Detailed Implementation

[0030] The specific embodiments of this utility model are further described below:

[0031] This embodiment provides a replacement support structure for actively controlling the displacement of the foundation pit. The replacement support structure is set up based on the already constructed bottom plate 3 and floor slab 4 in the foundation pit. The replacement support structure applies prestress to the retaining structure 1 based on the bottom plate 3 and floor slab 4 to achieve the purpose of "avoiding deformation of the foundation pit".

[0032] For ease of description, the base plate 3 and the floor slab 4 are collectively referred to as floor slabs.

[0033] See Figure 1 and Figure 2 The support structure in this embodiment mainly includes a corbel 51, a diagonal brace 52, and an extension force-adding device 53.

[0034] The bracket 51 is a prior art building engineering device.

[0035] One end of the diagonal brace 52 is the base end, and the other end is the top support end. In this embodiment, the diagonal brace 52 is made of structural steel.

[0036] The extension force-adding device 53 is a prior art telescopic drive device with two telescopic ends. These two telescopic ends can move closer or further apart under driving action, thereby outputting a spreading force. Furthermore, the extension force-adding device 53 used in this embodiment is essentially a jack device, while in other embodiments, an electric telescopic cylinder device can also be used to achieve the same effect.

[0037] In this embodiment, the assembly structure of the support replacement structure is as follows:

[0038] The bracket 51 is installed based on the base plate 3 or the floor slab 4, and the bracket 51 is located near the enclosure structure 1.

[0039] The base end of the diagonal brace 52 is connected to the corbel 51 via an extension force-adding device 53.

[0040] More specifically, the base end of the diagonal brace 52 is assembled and connected to one telescopic end of the extension force-adding device 53, and the other telescopic end of the extension force-adding device 53 is assembled and connected to the corbel 51.

[0041] The top end of the diagonal brace 52 is inclined upward against the enclosure structure 1 on the side where the enclosure structure 1 is located, and is assembled and connected with the enclosure structure 1.

[0042] More specifically, for the diagonal brace 52, an assembly connection base plate 54 (essentially a steel plate) is pre-embedded in the enclosure structure 1. The top support end of the diagonal brace 52 is assembled and connected to the assembly connection base plate 54 by welding, thereby achieving the effect of "assembling and connecting with the enclosure structure 1".

[0043] It should be noted that the "assembly connection between the extension force-adding device 53 and the corbel 51", the "assembly connection between the diagonal brace 52 and the extension force-adding device 53" and the "assembly connection between the diagonal brace 52 and the enclosure structure 1" can adopt "flange connection", "welded connection" or other mechanical connection forms.

[0044] It should be noted that the retaining structure 1 mentioned in this embodiment can be a ground wall or cast-in-place piles.

[0045] It should be noted that, in this embodiment, numerous replacement support structures are installed on the base slab 3 and each floor slab 4. These replacement support structures are evenly and discretely distributed along the enclosure structure 1 to "apply prestress to the enclosure structure 1 based on the base slab 3 or floor slab 4, thereby achieving the purpose of controlling the deformation of the foundation pit and preventing displacement deformation of the foundation pit structure." These numerous replacement support structures, combined together, essentially constitute a replacement support system.

[0046] In addition, in order to facilitate the measurement of displacement and deformation data of the foundation pit, an inclinometer tube 6 of the prior art is also installed for the foundation pit. The inclinometer tube 6 is installed in the soil outside the retaining structure 1.

[0047] During the process of applying force by controlling the elongation force-applying device 53, the force output of the elongation force-applying device 53 can be dynamically adjusted according to the deformation measured by the inclinometer 6 to precisely control the prestress. The inclinometer 6 can be regarded as a component of the support replacement system.

[0048] In other embodiments, the inclinometer tube 6 may also be installed in the enclosure structure 1.

[0049] It should be noted that the corbel 51 can be made of concrete or steel. If the corbel 51 is made of concrete, it can be cast together with the base slab 3 or the floor slab 4.

[0050] The following describes the construction process of the entire support replacement system:

[0051] 1) See Figure 3 Construction includes retaining structure 1, horizontal support 2, and inclinometer 6. Excavation is carried out to the bottom elevation of the foundation pit, and assembly connection base plate 54 is pre-embedded on retaining structure 1.

[0052] 2) See Figure 4 Construction base plate 3 and corresponding corbel 51;

[0053] 3) See Figure 5 A diagonal brace 52 and an extension force-enhancing device 53 are installed between the assembly connection base plate 54 and the bracket 51. The diagonal brace 52 and the assembly connection base plate 54 are connected by welding, the diagonal brace 52 and the extension force-enhancing device 53 are connected by flange, and the extension force-enhancing device 53 and the bracket 51 are connected by welding or flange.

[0054] 4) See Figure 6 Remove the third horizontal support 2;

[0055] 5) See Figure 7 Construction floor slab 4 and corresponding corbel 51;

[0056] 6) See Figure 8 A diagonal brace 52 and an extension force-enhancing device 53 are installed between the assembly connection base plate 54 and the bracket 51. The diagonal brace 52 and the assembly connection base plate 54 are connected by welding, the diagonal brace 52 and the extension force-enhancing device 53 are connected by flange, and the extension force-enhancing device 53 and the bracket 51 are connected by welding or flange.

[0057] 7) See Figure 9 Remove the second horizontal support 2;

[0058] 8) See Figure 10 Construction floor slab 4 and corresponding corbel 51;

[0059] 9) See Figure 11 A diagonal brace 52 and an extension force-enhancing device 53 are installed between the assembly connection base plate 54 and the bracket 51. The diagonal brace 52 and the assembly connection base plate 54 are connected by welding, and the diagonal brace 52 and the extension force-enhancing device 53 are connected by flange. The extension force-enhancing device 53 and the bracket 51 are connected by welding or flange.

[0060] After the construction of the replacement support structure and system is completed, the force of the top support output by the extension force-adding device 53 can be controlled precisely to control the force of the prestress applied to the retaining structure 1, thereby achieving the effect of dynamically adjusting the "application of prestress to the retaining structure 1". In this way, the prestress can be actively adjusted according to the deformation of the foundation pit, so as to effectively intervene when the retaining structure undergoes displacement deformation.

[0061] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A replacement support structure for actively controlling the displacement of a foundation pit, wherein floor slabs are constructed in the foundation pit; Its features are: The support structure includes a corbel (51), a diagonal brace (52), and an extension force-adding device (53); The corbel (51) is based on a floor slab; One end of the diagonal brace (52) is the base end, and the other end of the diagonal brace (52) is the top support end; the base end of the diagonal brace (52) is assembled and connected to the corbel (51) through the extension force-adding device (53), and the top support end of the diagonal brace (52) is assembled and connected to the enclosure structure (1) obliquely upward.

2. The active control foundation pit displacement replacement structure according to claim 1, characterized in that: The elongation force-adding device (53) is a jack device or an electric telescopic cylinder device.

3. The replacement support structure for actively controlling the displacement of the foundation pit according to claim 1, characterized in that: An assembly connection base plate (54) is pre-embedded on the enclosure structure (1), and the top support end of the diagonal brace (52) is assembled and connected to the assembly connection base plate (54).

4. The active control foundation pit displacement replacement structure according to claim 1, characterized in that: The assembly connection between the extension force-adding device (53) and the corbel (51), the assembly connection between the diagonal brace (52) and the extension force-adding device (53), and the assembly connection between the diagonal brace (52) and the enclosure structure (1) shall be in the form of flange connection or welding connection.

5. The replacement support structure for actively controlling the displacement of the foundation pit according to claim 1, characterized in that: The retaining structure (1) is a ground wall, cast-in-place piles, interlocking piles, SMW method piles or PC method piles.

6. The replacement support structure for actively controlling the displacement of the foundation pit according to claim 1, characterized in that: The corbel (51) is made of concrete or steel.

7. The active control foundation pit displacement replacement structure according to claim 1, characterized in that: The corbel (51) is made of concrete and is cast together with the floor slab.

8. A support replacement system for actively controlling the displacement of a foundation pit, characterized in that: The support system includes a plurality of support structures as described in any one of claims 1 to 7, which are uniformly and discretely distributed along the enclosure structure (1).

9. The active control foundation pit displacement replacement system according to claim 8, characterized in that: The replacement support system also includes a clinometer (6), which is installed in the retaining structure (1) or in the soil outside the retaining structure (1).

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