Subway station foundation pit layered excavation supporting structure

Abstract

The utility model belongs to the technical field of foundation pit excavation, and discloses a subway station foundation pit layered excavation supporting structure which comprises a plurality of supporting assemblies and connecting assemblies, and the adjacent supporting assemblies are connected through the connecting assemblies. The supporting assembly comprises supporting plates, a locking rod and a sliding limiting rod, the locking rod comprises a middle threaded sleeve and end screws, the two ends of the middle threaded sleeve are in threaded connection with the end screws, and the ends, away from each other, of the two end screws are rotationally connected with the supporting plates correspondingly; the two end screws are used for controlling the two supporting plates to abut against the two sides of the foundation pit correspondingly; the sliding limiting rod is of a telescopic rod structure, and the two ends of the sliding limiting rod are connected with the two supporting plates respectively. The stability of the foundation pit structure can be enhanced, garbage cannot be generated, follow-up disassembly is facilitated, and later treatment cost is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of foundation pit excavation, and particularly relates to a layered excavation supporting structure for a subway station foundation pit. BACKGROUND

[0002] A foundation pit is a soil pit excavated at a foundation design position according to a foundation elevation and a foundation plan size. With the continuous development of underground space, super-large foundation pit projects are increasingly applied. The open cut method is a commonly used construction method.

[0003] In the process of excavating a foundation pit by the open cut method, in order to ensure the stability of the foundation pit, supporting work needs to be performed on the foundation pit. The supporting structure of the foundation pit mainly includes a retaining structure + internal support system, a retaining structure + anchor cable, and a slope + soil nailing support. The slope + soil nailing support is suitable for engineering projects with a relatively open site. For urban municipal projects, due to the relatively narrow site, the retaining structure + internal support system and the retaining structure + anchor cable are commonly used. The retaining structure is a temporary structure, and after the project is completed, the retaining piles, anchor cables, and the like are permanently left in the soil, becoming construction waste and causing waste of resources. In particular, the anchor cable left in the soil layer may affect the layered excavation of the foundation pit, and a greater cost needs to be spent to handle it. SUMMARY

[0004] The utility model aims to provide a layered excavation supporting structure for a subway station foundation pit, so as to solve the above problems in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A layered excavation supporting structure for a subway station foundation pit includes supporting assemblies and connecting assemblies. The supporting assemblies are provided in plurality, and adjacent supporting assemblies are connected through connecting assemblies. The supporting assembly includes a supporting plate, a locking rod, and a sliding limiting rod. The locking rod includes a middle threaded sleeve and an end screw rod. The ends of the middle threaded sleeve are threadedly connected with the end screw rods. The ends of the two end screw rods, which are away from each other, are respectively rotatably connected with a supporting plate, so as to control the two supporting plates to abut against the two sides of the foundation pit through the two end screw rods. The sliding limiting rod is a telescopic rod structure, and the two ends of the sliding limiting rod are respectively connected with the two supporting plates.

[0007] As a preferred technical solution in the utility model, an annular groove is formed in the inner side of the supporting plate, a first bearing is installed in the annular groove, the outer ring of the first bearing is connected with the inner wall of the annular groove, and one end of the end screw rod is inserted into the inner ring of the first bearing.

[0008] As one preferred technical scheme in the utility model, the first bearing inner ring corresponds to the middle part of the supporting plate, and a first through hole is formed in the middle part of the supporting plate, the inner diameter of the first through hole is smaller than the inner diameter of the inner ring of the first bearing, and one end of the end screw rod is coaxially connected with a plug-in rod, the diameter of the plug-in rod is smaller than the diameter of the end screw rod, the plug-in rod is matched with the first through hole and is plugged into the side wall of the foundation pit, and the end of the plug-in rod away from the end screw rod is a conical structure.

[0009] As one preferred technical scheme in the utility model, the middle part of the middle screw sleeve is provided with a partition plate, both sides of the partition plate are provided with end screw holes which are threadedly connected with the end screw rod, and the thread directions of the two end screw holes are opposite.

[0010] As one preferred technical scheme in the utility model, the sliding limiting rod comprises a middle movable rod and an end sleeve, the two ends of the middle movable rod are slidably connected with one end sleeve respectively, and the ends of the two end sleeves away from each other are clamped with the two supporting plates respectively.

[0011] As one preferred technical scheme in the utility model, one side of the polygonal protrusion is provided with a T-shaped sliding groove, a T-shaped sliding block is slidably connected in the T-shaped sliding groove, and a spring is arranged between the T-shaped sliding block and the inner bottom surface of the T-shaped sliding groove; the end of the T-shaped sliding block extending out of the T-shaped sliding groove is a spherical head, a spherical clamping groove is formed in the side wall of the polygonal recess, the spherical head is matched and plugged into the spherical clamping groove, and the depth of the spherical clamping groove is not greater than the radius of the spherical clamping groove.

[0012] As one preferred technical scheme in the utility model, the connecting assembly comprises a movable ring and a connecting sleeve rod, the outer wall of the middle screw sleeve of each adjacent two supporting assemblies is sleeved with a movable ring, and the two movable rings are connected through the connecting sleeve rod.

[0013] As one preferred technical scheme in the utility model, the movable ring is an annular structure provided with a mounting hole in the middle part, at least one movable ball group is arranged on the inner wall of the mounting hole, each movable ball group comprises a plurality of movable balls which are uniformly embedded in the circumferential direction of the movable ring, and the movable ball is in contact with the outer wall of the middle screw sleeve; the outer wall of the movable ring is protrudingly provided with a connecting block, a threaded connection groove is formed in the connecting block, and the two ends of the connecting sleeve rod are threadedly connected with the two threaded connection grooves respectively.

[0014] As one preferred technical scheme in the utility model, the two ends of the mounting hole are both tapered holes which are gradually reduced from the outside to the inside.

[0015] As one preferred technical scheme in the utility model, the connecting sleeve rod comprises a middle sleeve and end connecting rods connected to both ends of the middle sleeve, a circular sliding cavity is arranged in the middle sleeve, circular holes communicating with the outside are formed at both ends of the circular sliding cavity, the inner diameter of the circular hole is smaller than the inner diameter of the circular sliding cavity; one end of the end connecting rod is a T-shaped cylindrical head matched and inserted into the circular sliding cavity, and the other end of the end connecting rod is provided with an external thread matched and connected with a threaded connecting groove.

[0016] Beneficial effects: when the utility model is used for excavating a foundation pit, the supporting assembly can be installed between the excavated foundation pits, the two supporting plates are abutted against the two sides of the foundation pit, the two supporting plates are connected by the sliding limiting rods, the supporting plates are prevented from rotating, then the length of the locking rod is adjusted, the middle threaded sleeve and the end screw rod are relatively rotated, the length of the locking rod is gradually increased, the two supporting plates can be tightly abutted against the surface of the foundation pit, and the stability of the foundation pit structure is ensured; during further layer-by-layer excavation, a plurality of supporting assemblies can be installed, then the connecting assemblies are selectively connected by the connecting assembly, and the overall stability is further improved, the process does not produce garbage, and the subsequent disassembly is convenient, and the treatment cost in the later period is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view when two supporting assemblies are connected in the utility model.

[0018] Figure 2 It is Figure 1 It is an enlarged schematic view of part A.

[0019] In the figure: 1 - supporting plate; 101 - annular groove; 102 - polygonal protrusion; 103 - T-shaped sliding block; 104 - spring; 2 - locking rod; 201 - middle threaded sleeve; 202 - end screw rod; 203 - insertion rod; 3 - sliding limiting rod; 301 - middle movable rod; 302 - end sleeve; 4 - first bearing; 5 - movable ring; 501 - movable ball; 502 - connecting block; 6 - connecting sleeve rod; 601 - middle sleeve; 602 - end connecting rod. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the utility model will be briefly introduced in combination with the drawings and the description of the embodiments or the prior art, and obviously, the following description of the structure of the drawings is only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor. It should be noted that the description of these embodiment modes is used to help understand the utility model, but does not constitute a limitation on the utility model.

[0021] Embodiment:

[0022] As Figure 1 and Figure 2 shown, the embodiment provides a subway station foundation pit layered excavation supporting structure, comprising supporting components and connecting components, the supporting components are provided with multiple, arranged according to actual conditions, such as transverse arrangement and longitudinal arrangement according to actual conditions, adjacent supporting components are connected through connecting components, so that multiple supporting components cooperate with each other, or all supporting components cooperate with each other, giving better support in the process of layered excavation of the subway station foundation pit;The supporting component comprises a supporting plate 1, a locking rod 2 and a sliding limiting rod 3, the locking rod 2 comprises a middle threaded sleeve 201 and an end screw 202, both ends of the middle threaded sleeve 201 are threadedly connected with the end screw 202, one end of each of the two end screws 202 away from each other is rotatably connected with a supporting plate 1, so as to control the two supporting plates 1 to abut against the two sides of the foundation pit through the two end screws 202, the length of the locking rod 2 can be adjusted through the threaded adjustment of the middle threaded sleeve 201 and the end screw 202, so as to tension the two supporting plates 1, and the two sides of the foundation pit are abutted by the supporting plate 1, thereby enhancing the stability of the foundation pit;The sliding limiting rod 3 is a telescopic rod structure, both ends of the sliding limiting rod 3 are connected with two supporting plates 1 respectively, so as to ensure that the two supporting plates 1 will not rotate, and the locking rod 2 will not be affected by the friction between the supporting plate 1 and the foundation pit surface when adjusting the length.

[0023] The utility model discloses when carrying out foundation pit excavation, can install supporting component between dug foundation pit, through two supporting plate 1 abut against the two sides of the foundation pit, utilize the sliding limiting rod 3 between two supporting plate 1 and connect, prevent supporting plate 1 rotate, then adjust the length of locking rod 2, make middle threaded sleeve 201 and end screw 202 relative rotation, and then make the length of locking rod 2 step by step side length, guarantee two supporting plate 1 can tightly abut on the foundation pit surface, guarantee the stability of foundation pit structure, in the process of further layered excavation, can install multiple supporting components, then utilize connecting component and selectivity connect connecting component, further strengthen the stability of whole, this process will not produce garbage, and convenient subsequent dismounting, avoid the processing cost of later period.

[0024] As a preferred embodiment in the present embodiment, it needs to be further explained that the inner side of the support plate 1 is provided with an annular groove 101, and the first bearing 4 is installed in the annular groove 101. The outer ring of the first bearing 4 is connected with the inner wall of the annular groove 101, and one end of the end screw rod 202 is inserted into the inner ring of the first bearing 4. Through the first bearing 4, the end screw rod 202 and the support plate 1 can be better connected in rotation, and the friction between them is reduced, thereby reducing the resistance of the support plate 1 when the end screw rod 202 rotates spirally.

[0025] As a preferred embodiment in the present embodiment, it needs to be further explained that the first bearing 4 inner ring corresponds to the middle part of the support plate 1, which is provided with a first through hole. The inner diameter of the first through hole is smaller than the inner diameter of the inner ring of the first bearing 4, so that the end screw rod 202 cannot pass through the support plate 1, and the adjustment of the end screw rod 202 can still tension the support plate 1; one end of the end screw rod 202 is coaxially connected with a plug-in rod 203, the diameter of the plug-in rod 203 is smaller than the diameter of the end screw rod 202, the plug-in rod 203 matches the first through hole and is inserted into the side wall of the foundation pit, and the end of the plug-in rod 203 away from the end screw rod 202 is a tapered structure, which facilitates the insertion of the plug-in rod 203 into the side of the foundation pit, and further ensures the stability of the structure.

[0026] As a preferred embodiment in the present embodiment, it needs to be further explained that the middle part of the middle threaded sleeve 201 is provided with a partition plate, and the two sides of the partition plate are provided with end threaded holes which are threadedly connected with the end screw rod 202. The screw directions of the two end threaded holes are opposite, so that by rotating the middle threaded sleeve 201, the two end screw rods 202 can be adjusted at the same time, and the two end screw rods 202 can move spirally towards each other or away from each other, saving adjustment time. It needs to be explained that in actual use, adjustment holes can be formed on the outer wall of the middle threaded sleeve 201, so that adjustment members can be inserted into the adjustment holes, and the middle threaded sleeve 201 can be rotated more easily by holding the adjustment members.

[0027] As a preferred embodiment in the present embodiment, it needs to be further explained that the sliding limiting rod 3 includes a middle movable rod 301 and an end sleeve 302. The two ends of the middle movable rod 301 are respectively connected with an end sleeve 302 in sliding connection, and the ends of the two end sleeves 302 away from each other are respectively connected with the two support plates 1, so that the sliding limiting rod 3 can be adjusted in extension and contraction according to the change of the distance between the two support plates 1, and the support plates 1 can also be limited by the sliding limiting rod 3 to prevent the support plates 1 from rotating.

[0028] As a preferred embodiment in the embodiment, it needs to be explained further that one side of each of the two supporting plates 1 facing each other is provided with a polygonal protrusion 102, one end of the end sleeve 302 is provided with a polygonal groove, the polygonal protrusion 102 is matched and inserted into the polygonal groove, and quick assembly and disassembly can be achieved; one side of the polygonal protrusion 102 is provided with a T-shaped sliding groove, a T-shaped sliding block 103 is slidably connected in the T-shaped sliding groove, a spring 104 is installed between the T-shaped sliding block 103 and the inner bottom surface of the T-shaped sliding groove, forming a resilient polygonal protrusion 102; one end of the T-shaped sliding block 103 extending out of the T-shaped sliding groove is a spherical head, a spherical clamping groove is formed in the side wall of the polygonal groove, the spherical head is matched and inserted into the spherical clamping groove, and the depth of the spherical clamping groove is not greater than the radius of the spherical clamping groove, the stability of the connection between the end sleeve 302 and the supporting plate 1 can be further enhanced by using the polygonal protrusion 102, and when disassembling, the polygonal groove only needs to be squeezed to make the spherical head retract into the T-shaped sliding groove, so that the sliding limiting rod 3 can be disassembled.

[0029] As a preferred embodiment in the embodiment, it needs to be explained further that the connecting assembly includes a movable ring 5 and a connecting sleeve rod 6, the movable ring 5 is sleeved outside the middle threaded sleeve 201 of each of the two adjacent supporting assemblies, the number of the movable ring 5 can be installed according to actual conditions, and the two movable rings 5 are connected by the connecting sleeve rod 6, so that the relative movement of the single supporting assembly between the two adjacent supporting assemblies does not occur, and the stability of the whole is enhanced.

[0030] As a preferred embodiment in the embodiment, it needs to be explained further that the movable ring 5 is an annular structure provided with a mounting hole in the middle, at least one movable ball group is installed on the inner wall of the mounting hole, each movable ball group includes a plurality of movable balls 501 uniformly embedded in the circumferential direction of the movable ring 5, the movable balls 501 are in contact with the outer wall of the middle threaded sleeve 201, so that the installation and movement of the movable ring 5 are more relaxed, and the friction is reduced, and in actual use, the movable ring 5 can also be rotated and adjusted in position, so that the two movable rings 5 can be more easily connected by the connecting sleeve rod 6; the outer wall of the movable ring 5 is protrudingly provided with a connecting block 502, the connecting block 502 is provided with a threaded connection groove, and the two ends of the connecting sleeve rod 6 are respectively threadedly connected with the two threaded connection grooves, so that the connection is simple and stable.

[0031] As a preferred embodiment in the embodiment, it needs to be explained further that the two ends of the mounting hole are both tapered holes that are gradually smaller from the outside to the inside, so that the movable ring 5 can be more easily installed outside the middle threaded sleeve 201.

[0032] As a preferred embodiment in the embodiment, it needs to be further explained that the connecting sleeve rod 6 comprises a middle sleeve 601 and end connecting rods 602 connected to both ends of the middle sleeve 601, the middle sleeve 601 is internally provided with a circular sliding cavity, both ends of the circular sliding cavity are provided with circular holes communicating with the outside, the inner diameter of the circular hole is smaller than the inner diameter of the circular sliding cavity; one end of the end connecting rod 602 is a T-shaped cylindrical head matched and inserted into the circular sliding cavity, the other end of the end connecting rod 602 is provided with an external thread matched and connected with a threaded connecting groove, so that the middle sleeve 601 and the end connecting rod 602 can realize relative sliding and rotation, the overall length is adjusted through relative sliding, and the threaded connection with the connecting block 502 is facilitated through relative rotation.

[0033] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A subway station foundation pit layered excavation supporting structure, characterized in that, The utility model provides a support assembly and connecting assembly, support assembly sets up multiple, and the support assembly is connected through connecting assembly between adjacent support assembly, support assembly includes support board (1), locking lever (2) and slide limiting lever (3), locking lever (2) includes middle part threaded sleeve (201) and end screw rod (202), both ends of middle part threaded sleeve (201) are all threadedly connected with end screw rod (202), and the end away from each other of two end screw rods (202) is respectively rotatably connected with a support board (1), and two support boards (1) are controlled through two end screw rods (202) and are respectively pressed against the both sides of foundation pit, slide limiting lever (3) is telescopic link structure, and both ends of slide limiting lever (3) are connected with two support boards (1) respectively.

2. The layered excavation support structure for a subway station pit according to claim 1, wherein The inner side of the support plate (1) is provided with an annular groove (101), and the annular groove (101) is provided with a first bearing (4). The outer ring of the first bearing (4) is connected with the inner wall of the annular groove (101), and one end of the end screw rod (202) is inserted into the inner ring of the first bearing (4).

3. The layered excavation support structure for a subway station pit according to claim 2, wherein The first bearing (4) corresponds to the first through hole in the middle of the support plate (1), and the inner diameter of the first through hole is smaller than the inner diameter of the inner ring of the first bearing (4). One end of the end screw rod (202) is coaxially connected with a plug-in rod (203), and the diameter of the plug-in rod (203) is smaller than the diameter of the end screw rod (202). The plug-in rod (203) matches the first through hole and is inserted into the side wall of the foundation pit. The end of the plug-in rod (203) away from the end screw rod (202) is a tapered structure.

4. The layered excavation support structure for a subway station foundation pit according to any one of claims 1-3, characterized in that, The middle part of the middle part threaded sleeve (201) is provided with a partition plate, and the two sides of the partition plate are provided with end threaded holes threadedly connected with the end screw rod (202). The thread directions of the two end threaded holes are opposite.

5. The layered excavation support structure for a subway station pit according to claim 1, wherein The slide limiting lever (3) includes a middle movable rod (301) and an end sleeve (302). The two ends of the middle movable rod (301) are slidably connected with one end sleeve (302) respectively. The ends of the two end sleeves (302) away from each other are respectively clamped with two support plates (1).

6. The layered excavation support structure for a subway station pit according to claim 5, wherein The side of the polygonal protrusion (102) is provided with a T-shaped sliding groove, and the T-shaped sliding groove is slidably connected with a T-shaped sliding block (103). The spring (104) is arranged between the T-shaped sliding block (103) and the inner bottom surface of the T-shaped sliding groove. The end of the T-shaped sliding block (103) extending out of the T-shaped sliding groove is a spherical head. The side wall of the polygonal recess is provided with a spherical clamping groove. The spherical head is matched and inserted into the spherical clamping groove, and the depth of the spherical clamping groove is not greater than the radius of the spherical clamping groove.

7. The layered excavation support structure of a subway station pit according to claim 1, 2, 3, 5 or 6, characterized in that, The connecting assembly includes a movable ring (5) and a connecting sleeve rod (6). The outer surface of the middle part threaded sleeve (201) of the adjacent two support assemblies is sleeved with a movable ring (5). The two movable rings (5) are connected through the connecting sleeve rod (6).

8. The layered excavation support structure for a subway station pit according to claim 7, wherein The active ring (5) is an annular structure with a mounting hole in the middle, at least one active ball group is mounted on the inner wall of the mounting hole, each active ball group includes a plurality of active balls (501) uniformly embedded in the circumferential direction of the active ring (5), the active balls (501) are in contact with the outer wall of the middle threaded sleeve (201); the outer wall of the active ring (5) is provided with a connecting block (502), the connecting block (502) is provided with a threaded connection groove, and the two ends of the connecting sleeve rod (6) are respectively screwed with the two threaded connection grooves.

9. The layered excavation support structure for a subway station pit according to claim 8, wherein Both ends of the mounting hole are tapered holes that are open from the outside to the inside and gradually become smaller.

10. The layered excavation support structure for a subway station pit according to claim 8, wherein The connecting sleeve rod (6) includes a middle sleeve (601) and an end connecting rod (602) connected to both ends of the middle sleeve (601), the middle sleeve (601) is internally provided with a circular sliding cavity, both ends of the circular sliding cavity are provided with circular holes communicating with the outside, and the inner diameter of the circular hole is smaller than the inner diameter of the circular sliding cavity; one end of the end connecting rod (602) is a T-shaped cylindrical head matched and inserted into the circular sliding cavity, and the other end of the end connecting rod (602) is provided with an external thread matched and connected with the threaded connection groove.

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