Tunnel foundation pit supporting structure for tunnel construction

Abstract

The utility model discloses a tunnel foundation pit supporting structure for tunnel construction, which belongs to the technical field of tunnel construction and comprises a supporting unit and a frame unit, the supporting unit is composed of a top supporting plate and side supporting plates, the side supporting plates are hinged to two ends of the top supporting plate, and the frame unit is composed of a portal frame. A hydraulic cylinder is arranged on the portal frame and used for driving the side supporting plates to rotate relative to the top supporting plate so as to adjust the size of the supporting structure, in addition, an adjusting mechanism is connected to the bottom of the portal frame and comprises a supporting frame and a jacking air cylinder, the jacking air cylinder works to adjust the height of the supporting structure, and a jacking roller is connected to the top of the jacking air cylinder; and an arc-shaped groove is formed in the top of the supporting frame and used for limiting the top roller, so that the problem that the jacking air cylinder swings and collides in the supporting frame is avoided, and the using effect of the tunnel foundation pit supporting structure is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel construction, and in particular relates to a tunnel foundation pit supporting structure for tunnel construction. Background Art

[0002] During the tunnel construction process, the excavated foundation pit needs to be supported and protected to avoid the risk of soil collapse in the foundation pit. Therefore, the support structure of the tunnel foundation pit is an indispensable protective component in tunnel construction. During the construction process, the inner wall of the tunnel is supported by the support structure to avoid soil collapse, so as to facilitate further construction and complete the tunnel construction work by a construction and support operation method.

[0003] There are various types of supporting structures for existing tunnel foundation pits. For example, Chinese invention patent CN116240901A discloses an anti-deformation supporting mechanism for deep foundation pits in tunnel construction, wherein the supporting mechanism comprises an inner supporting plate, a plunger is provided at the lower end of the inner supporting plate, and the inner supporting plate is fixed by inserting the plunger into the foundation of the tunnel; a supporting plate is connected to the inner side of the inner supporting plate, and an inclined plate is welded on the supporting plate to improve the stability of the supporting plate; buffer mechanisms are symmetrically distributed on the sides of the inner supporting plate, and an outer supporting plate is connected through the buffer mechanism; a supporting platform is welded on the side of the outer supporting plate, a movable groove is provided on the supporting platform, and an adjusting plate is connected to the supporting platform, a limiting plate is connected to the adjusting plate, and a convex groove is provided on the limiting plate, a convex sliding block is installed in the convex groove, and an adjusting mechanism is provided on the convex sliding block, and the angle of the adjusting plate is adjusted by the adjusting mechanism, thereby supporting and protecting the foundation pit of the tunnel.

[0004] Although the above-mentioned supporting mechanism can support and protect the side walls of the tunnel foundation pit, and can also adjust the angle of the adjustment plate to achieve the purpose of support, since the inner wall of the existing tunnel foundation pit is an arc-shaped structure and the adjustment plate is a plane structure, it is difficult to achieve a uniform force effect when supporting the inner wall of the arc-shaped structure through the plane adjustment plate. Therefore, the supporting and protecting effect is not ideal, which causes certain inconveniences to the tunnel construction work. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] A tunnel foundation pit support structure for tunnel construction, comprising a support unit and a frame unit, wherein the support unit is arranged on the frame unit, and the support unit is used to support and protect the inner wall of the tunnel foundation pit, wherein the support unit is composed of a top support plate and a side support plate, wherein the top support plate and the side support plate are arc-shaped structures, and the top support plate and the side support plate cooperate with each other to support the inner wall of the tunnel foundation pit, and the end of the side support plate is hinged to the end of the top support plate, and a driving mechanism is also arranged on the frame unit, and the driving mechanism is used to drive the side support plate to rotate relative to the top support plate, and after the driving mechanism stops working, the side support plate is fixed relative to the top support plate.

[0008] Preferably, in the above-mentioned supporting structure, a plurality of reinforcing ribs are distributed on the inner walls of the top support plate and the side support plates, the reinforcing ribs are hollow structures, and the cross-section of the reinforcing ribs is trapezoidal in shape.

[0009] Preferably, in the above-mentioned supporting structure, an opening portion is provided at the connection between the top support plate and the side support plate to cooperate with the rotation of the side support plate relative to the top support plate, and the connection between the top support plate and the side support plate is connected through an elastic mechanism, one end of the elastic mechanism is hinged on the top support plate, and the other end is hinged on the side support plate.

[0010] Preferably, in the above-mentioned supporting structure, the frame unit is composed of relatively arranged gantries, and support beams are connected between the relatively arranged gantries. The driving mechanism is a hydraulic cylinder, one end of the hydraulic cylinder is hinged on the frame unit, and the other end is hinged on the side support plate. The hydraulic cylinder is used to drive the side support plate to rotate relative to the top support plate.

[0011] Preferably, in the above-mentioned supporting structure, the frame unit further comprises a fixing frame, the fixing frame is fixed on the top of the frame unit, and the top support plate is installed on the fixing frame.

[0012] Preferably, in the above-mentioned supporting structure, the bottom sliding part of the gantry is equipped with an adjustment mechanism, which includes a track wheel, which is arranged on a track laid in the track pit, and the supporting structure is driven to move on the track by the track wheel, and the track wheel also has a self-locking structure for fixing the supporting structure relative to the track.

[0013] Preferably, in the above-mentioned supporting structure, the gantry includes a horizontal beam and a vertical beam, the adjusting mechanism includes a supporting frame, the supporting frame is slidably assembled in the vertical beam, and a lifting cylinder is also installed inside the supporting frame. After the lifting cylinder abuts against the vertical beam and continues to work, it can drive the vertical beam to move upward relative to the supporting frame to adjust the height of the supporting structure.

[0014] Preferably, in the above-mentioned supporting structure, a supporting plate is also installed on the top of the lifting cylinder. When the lifting cylinder works to drive the supporting plate to abut against the vertical beam, it can continue to work to drive the vertical beam to move upward relative to the supporting frame to adjust the height of the supporting structure.

[0015] Preferably, in the above-mentioned supporting structure, one end of the jacking cylinder is hinged in the supporting frame, and the other end of the jacking cylinder is rotatably installed with a jacking roller. The jacking cylinder drives the jacking roller to roll along the inner wall of the supporting frame. When the jacking roller abuts against the vertical beam, the jacking cylinder drives the jacking roller to move and lift the vertical beam.

[0016] Preferably, in the above-mentioned support structure, an arc groove is opened on the top of the support frame, and the lifting cylinder drives the top roller to descend until the rotating shaft of the top roller falls into the arc groove so that the top roller is stabilized in the arc groove, which is used to limit the swing of the lifting cylinder.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The support structure in the utility model is provided with an arc-shaped top support plate and side support plates, so that the top support plate and the side support plates can be supported on the arc-shaped inner wall of the tunnel foundation pit, thereby achieving full protection and full support for the inner wall of the tunnel foundation pit and ensuring the support effect. In addition, the side support plates can rotate relative to the top support plates to adjust the size of the support structure, so that the support structure can adapt to the size of the tunnel foundation pit and facilitate operation. In addition, a plurality of reinforcing ribs are distributed on the inner walls of the top support plates and the side support plates to improve the support and protection effect.

[0019] The supporting structure in the utility model also includes an adjusting mechanism, which includes a supporting frame and a lifting cylinder. The lifting cylinder is used to adjust the height of the supporting structure, and a lifting roller is installed on the lifting cylinder to reduce noise during the height adjustment process. In addition, an arc groove is also provided on the top of the supporting frame to limit the lifting roller, thereby avoiding the problem of swinging of the lifting cylinder and ensuring the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the tunnel foundation pit support structure of the utility model;

[0021] Figure 2 for Figure 1 A front view of

[0022] Figure 3 It is a structural schematic diagram of the support unit in the utility model;

[0023] Figure 4 It is a cross-sectional view of the reinforcing rib in the utility model;

[0024] Figure 5 It is a front view of the support unit in the utility model;

[0025] Figure 6 for Figure 5 A magnified view of the structure at C in the middle;

[0026] Figure 7 It is a structural schematic diagram of the frame unit in the utility model;

[0027] Figure 8 for Figure 7 A front view of

[0028] Fig. 9 It is a structural schematic diagram of the gantry in the utility model;

[0029] Fig.10 for Fig. 9 Schematic diagram of the local structure after the middle gantry is disassembled;

[0030] Fig.11 for Fig.10 A front view of

[0031] Fig.12 It is a structural schematic diagram of the working state of the regulating mechanism in the utility model;

[0032] Fig.13 It is a structural schematic diagram of the regulating mechanism in the utility model when it is not in operation.

[0033] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0034] A. Support unit; B. Frame unit;

[0035] 100, top support plate; 200, side support plate; 300, gantry; 400, adjustment mechanism;

[0036] 101. reinforcing rib; 102. elastic mechanism; 103. opening;

[0037] 301, fixed frame; 302, hydraulic cylinder; 303, cross beam; 304, vertical beam; 305, buffer mechanism;

[0038] 401, track wheel; 402, support frame; 403, lifting cylinder; 404, top roller;

[0039] 402a, arc groove. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0043] like Figure 1~2 As shown, it is a structural schematic diagram of the tunnel foundation pit support structure of the tunnel construction in this embodiment. The support structure in this embodiment is used in the field of tunnel construction technology to support and protect the foundation pit formed by the tunnel construction, thereby avoiding the risk of collapse of the inner wall of the tunnel.

[0044] like Figure 1 As shown, the tunnel foundation pit support structure in this embodiment is arranged on the track laid in the tunnel foundation pit, and can move along the length direction of the track, so as to support and protect the inner wall of the tunnel foundation pit, as shown in 1 and Figure 2 As shown, the tunnel foundation pit support structure in this embodiment includes a support unit A and a frame unit B. The support unit A is arranged on the frame unit B. The frame unit B moves along the track in the tunnel foundation pit. The support unit A is used to protect the inner wall of the tunnel foundation pit.

[0045] The support unit A in this embodiment includes a top support plate 100 and a side support plate 200. The top support plate 100 and the side support plate 200 are arc-shaped structures. Therefore, the top support plate 100 and the side support plate 200 can be attached to the inner wall of the tunnel foundation pit, thereby supporting the inner wall of the tunnel. Figure 2 As shown, the top support plate 100 in this embodiment is supported on the inner wall of the top of the tunnel foundation pit, and the side support plate 200 is used to support the inner wall of the tunnel, thereby achieving full protection and full support for the inner wall of the tunnel foundation pit and realizing the safety guarantee purpose of tunnel construction.

[0046] In addition, if Figure 5 as well as Figure 6 As shown, it is a schematic diagram of the assembly structure of the top support plate 100 and the side support plate 200 in this embodiment. The two ends of the top support plate 100 in this embodiment are hinged with the side support plates 200, so that the side support plates 200 can rotate relative to the top support plate 100, so that the angle of the side support plates 200 can be adjusted according to the size of the tunnel to ensure the supporting effect. In this embodiment, the ends of the top support plate 100 and the ends of the side support plates 200 are both provided with openings 103. The provision of the openings 103 facilitates the side support plates 200 to rotate relative to the top support plate 100, so that the angle of the side support plates 200 relative to the top support plate 100 can be adjusted.

[0047] In addition, if Figure 3as well as Figure 4 As shown, in order to improve the supporting strength of the top support plate 100 and the side support plate 200 and avoid the problem of deformation and rupture caused by excessive pressure on the local area, a plurality of reinforcing ribs 101 are evenly distributed on the inner walls of the top support plate 100 and the side support plate 200 in this embodiment, as shown in FIG. Figure 4 As shown, the cross-section of the reinforcing rib 101 in this embodiment is a trapezoidal structure, and the reinforcing rib 101 is a hollow structure. By distributing the reinforcing rib 101 on the inner walls of the top support plate 100 and the side support plate 200, the compressive strength of the top support plate 100 and the side support plate 200 can be improved to ensure the supporting effect. In addition, the hollow structure of the reinforcing rib 101 reduces the weight of the top support plate 100 and the side support plate 200, thereby facilitating the processing and transportation of the top support plate 100 and the side support plate 200.

[0048] And, if Figure 5 As shown, in the present embodiment, the connection between the top support plate 100 and the side support plate 200 is also connected by an elastic mechanism 102, one end of the elastic mechanism 102 is hinged on the top support plate 100, and the other end of the elastic mechanism 102 is hinged on the side support plate 200. Therefore, when the side support plate 200 rotates relative to the top support plate 100, the elastic mechanism 102 rotates and its length changes to cooperate with the rotation of the side support plate 200 relative to the top support plate 100.

[0049] like Figure 7 as well as Figure 8 As shown, it is a schematic diagram of the structure of the frame unit B in this embodiment, which consists of Figure 1 , Figure 2 as well as Figure 5It can be seen that the frame unit B in this embodiment is composed of relatively arranged gantry frames 300, and a support beam is connected between the relatively arranged gantry frames 300, so that the relatively arranged gantry frames 300 form an integral frame unit B. A fixing frame 301 is fixedly installed on the top of the frame unit B, and the fixing frame 301 is connected to the top support plate 100, so that the top support plate 100 is fixed relative to the frame unit B. In addition, a hydraulic cylinder 302 is also hinged on the frame unit B, one end of the hydraulic cylinder 302 is hinged to the frame unit B, and the other end of the hydraulic cylinder 302 is hinged to the side support plate 200. When the side support plate 200 is adjusted to rotate in order to match the size of the tunnel foundation pit, the side support can be driven by the operation of the hydraulic cylinder 302. The plate 200 rotates relative to the top support plate 100. At the same time, the elastic mechanism 102 at the connection between the top support plate 100 and the side support plate 200 is deformed synchronously to cooperate with the rotation of the side support plate 200 relative to the top support plate 100, thereby changing the size of the support unit A to cooperate with the support of the tunnel foundation pit and support and protect the inner wall of the tunnel foundation pit. It is worth noting that the hydraulic cylinder 302 in this embodiment is used as a driving mechanism to drive the side support plate 200 to rotate relative to the top support plate 100. Other structures can be used in this embodiment as long as they can drive the side support plate 200 to rotate relative to the top support plate 100 and have a self-locking function to fix the side support plate 200 relative to the top support plate 100.

[0050] In addition, if Fig. 9 as well as Fig.10 As shown, the frame unit B in this embodiment further includes an adjustment mechanism 400 disposed below the gantry 300, and the adjustment mechanism 400 is slidably assembled with the gantry 300, as shown in FIG. Figures 7-9 As shown, the gantry 300 in this embodiment includes a horizontal beam 303 and a vertical beam 304. The vertical beam 304 is fixedly installed at both ends of the horizontal beam 303, and the vertical beam 304 is slidably assembled with the adjustment mechanism 400. A track wheel 401 is installed at the bottom of the adjustment mechanism 400, and the track wheel 401 is rollingly assembled on the track of the tunnel foundation pit. It is worth noting that the track wheel 401 in this embodiment also has a self-locking structure. The track wheel 401 can move along the track of the foundation pit so as to drive the supporting structure in this embodiment to move in the tunnel foundation pit. When the tunnel foundation pit needs to be supported and protected, the self-locking structure can lock the track wheel 401 on the track, thereby ensuring the stability of the supporting structure.

[0051] like Figures 10-12As shown, in this embodiment, the adjustment mechanism 400 also includes a support frame 402 and a lifting cylinder 403 arranged inside the support frame 402. The support frame 402 is slidably inserted in the vertical beam 304 of the gantry 300. Therefore, when it is necessary to adjust the height of the support structure, the frame unit B slides relative to the support frame 402 through the vertical beam 304 to adjust the height of the support structure, so that the supporting plate 100 can be supported on the top wall of the tunnel foundation pit to support and protect the inner top wall of the tunnel foundation pit. The specific adjustment method is: the height of the support structure can be adjusted by pushing the vertical beam 304 to slide relative to the support frame 402 through the lifting cylinder 403.

[0052] In addition, since the pressure received during the process of lifting the vertical beam 304 by the lifting cylinder 403 in the prior art is relatively large, in order to increase the force-bearing area during the lifting process, a support plate is connected to the top of the lifting cylinder 403. When the lifting cylinder 403 works, it pushes the support plate to move in the support frame 402 so that the support plate abuts against the vertical beam 304. The lifting cylinder 403 continues to push the support plate to move to lift the vertical beam 304. However, when the support plate moves in the support frame 402, it is easy to rub against the inner wall of the support frame 402, thereby generating a large noise. In order to avoid this problem, Fig.10 As shown in Figure 12, the end of the lifting cylinder 403 in this embodiment is connected to a top roller 404. When the lifting cylinder 403 works to drive the top roller 404 to rise, the top roller 404 rolls on the inner wall of the support frame 402, thereby avoiding the occurrence of noise and ensuring a bass environment during the support and protection process. When the lifting cylinder 403 works to drive the top roller 404 to move upward so that the top roller 404 abuts against the vertical beam 304, the lifting cylinder 403 works to drive the top roller 404 to rise, thereby moving the vertical beam 304 upward, thereby moving the vertical beam 304 relative to the support frame 402 to adjust the overall height of the support structure so that the top support plate 100 can be supported on the top wall of the tunnel foundation pit.

[0053] It is worth noting that the lifting cylinder 403 in this embodiment can be fixedly installed in the support frame 402, but when the lifting cylinder 403 is fixedly installed in the support frame 402, it is necessary to ensure that the lifting cylinder 403 is accurately installed vertically to avoid the problem that the lifting cylinder 403 is installed tilted and its power end cannot abut the vertical beam 304 when extended. Therefore, the lifting cylinder 403 needs to be accurately installed in the support frame 402, which causes certain inconveniences to the processing operation. In order to avoid the occurrence of this problem, the lifting cylinder 403 in this embodiment can be hinged in the support frame 402. When the lifting cylinder 403 is operating, the top roller 404 moves upward until it supports the vertical beam 304 and then lifts the vertical beam 304. Since the lifting cylinder 403 is hinged in the support frame 402, when the support structure is not in use, the lifting cylinder 403 is easy to swing in the support frame 402, causing the lifting cylinder 403 and the top roller 404 to collide with the inner wall of the support frame 402. In order to solve this problem, the stability of the top roller 404 in the support frame 402 is ensured. Fig.12 as well as Fig.13 As shown, an arc groove 402a is provided at the top of the support frame 402 in this embodiment, and the lifting cylinder 403 drives the top roller 404 to descend until the rotating shaft of the top roller 404 lands in the arc groove 402a, and the top roller 404 can be stably in the arc groove 402a, thereby limiting the swing of the lifting cylinder 403 and ensuring the stability of the lifting cylinder 403 and the top roller 404 in the support frame 402.

[0054] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A tunnel foundation pit support structure for tunnel construction, comprising a support unit (A) and a frame unit (B), wherein the support unit (A) is arranged on the frame unit (B), and the support unit (A) is used to support and protect the inner wall of the tunnel foundation pit, characterized in that: The support unit (A) is composed of a top support plate (100) and a side support plate (200), the top support plate (100) and the side support plate (200) are arc-shaped structures, the top support plate (100) and the side support plate (200) cooperate with each other to support the inner wall of the tunnel foundation pit, and the end of the side support plate (200) is hinged to the end of the top support plate (100), and the frame unit (B) is also provided with a driving mechanism, the driving mechanism is used to drive the side support plate (200) to rotate relative to the top support plate (100), and after the driving mechanism stops working, the side support plate (200) is fixed relative to the top support plate (100).

2. The tunnel foundation pit support structure for tunnel construction according to claim 1, characterized in that: A plurality of reinforcing ribs (101) are distributed on the inner walls of the top support plate (100) and the side support plate (200); the reinforcing ribs (101) are hollow structures, and the cross-section of the reinforcing ribs (101) is in a trapezoidal shape.

3. The tunnel foundation pit support structure for tunnel construction according to claim 1, characterized in that: An opening (103) is provided at the connection between the top support plate (100) and the side support plate (200) for cooperating with the rotation of the side support plate (200) relative to the top support plate (100), and the connection between the top support plate (100) and the side support plate (200) is connected via an elastic mechanism (102), one end of the elastic mechanism (102) is hinged on the top support plate (100), and the other end is hinged on the side support plate (200).

4. The tunnel foundation pit support structure for tunnel construction according to claim 1, characterized in that: The frame unit (B) is composed of relatively arranged gantries (300), and a support beam is connected between the relatively arranged gantries (300). The driving mechanism is a hydraulic cylinder (302), one end of the hydraulic cylinder (302) is hinged on the frame unit (B), and the other end is hinged on the side support plate (200). The hydraulic cylinder (302) is used to drive the side support plate (200) to rotate relative to the top support plate (100).

5. The tunnel foundation pit support structure for tunnel construction according to claim 4, characterized in that: The frame unit (B) further comprises a fixing frame (301), the fixing frame (301) is fixed on the top of the frame unit (B), and the top support plate (100) is mounted on the fixing frame (301).

6. The tunnel foundation pit support structure for tunnel construction according to claim 4 or 5, characterized in that: The bottom of the gantry (300) is slidably equipped with an adjustment mechanism (400), the adjustment mechanism (400) comprising a track wheel (401), the track wheel (401) being arranged on a track laid in a track foundation pit, and being used to drive the support structure to move on the track, and the track wheel (401) also has a self-locking structure for fixing the support structure relative to the track.

7. The tunnel foundation pit support structure for tunnel construction according to claim 6, characterized in that: The gantry (300) comprises a horizontal beam (303) and a vertical beam (304), and the adjustment mechanism (400) comprises a support frame (402), the support frame (402) is slidably assembled in the vertical beam (304), and a lifting cylinder (403) is also installed inside the support frame (402), and the lifting cylinder (403) abuts against the vertical beam (304) and continues to work to drive the vertical beam (304) to move upward relative to the support frame (402) to adjust the height of the support structure.

8. The tunnel foundation pit support structure for tunnel construction according to claim 7, characterized in that: A support plate is also installed on the top of the lifting cylinder (403). When the lifting cylinder (403) works, the support plate is driven to abut against the vertical beam (304). Then, the lifting cylinder (403) continues to work and can drive the vertical beam (304) to move upward relative to the support frame (402) to adjust the height of the support structure.

9. The tunnel foundation pit support structure for tunnel construction according to claim 7, characterized in that: One end of the lifting cylinder (403) is hinged in the support frame (402), and the other end of the lifting cylinder (403) is rotatably mounted with a lifting roller (404). The lifting cylinder (403) drives the lifting roller (404) to roll along the inner wall of the support frame (402). When the lifting roller (404) abuts against the vertical beam (304), the lifting cylinder (403) drives the lifting roller (404) to move and lift the vertical beam (304).

10. The tunnel foundation pit support structure for tunnel construction according to claim 9, characterized in that: An arc groove (402a) is provided at the top of the support frame (402), and the lifting cylinder (403) drives the top roller (404) to descend when working until the rotating shaft of the top roller (404) falls into the arc groove (402a), so that the top roller (404) is stabilized in the arc groove (402a), which is used to limit the swing of the lifting cylinder (403).

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