A method for connecting a shaft and an open excavation foundation pit node

Abstract

The application relates to a shaft and open excavation foundation pit joint connecting method, and belongs to the technical field of foundation pit construction, which comprises the following steps: S1, excavating soil of a shaft to the bottom of the shaft, and connecting a plurality of grid assemblies with the shaft; S2, constructing a foundation pit retaining structure, excavating soil to a foundation bottom, and connecting the plurality of grid assemblies with the foundation pit retaining pile steel bars together during excavation; and S3, hanging a mesh, and spraying concrete to close one end of the grid assembly close to the foundation pit retaining pile steel bar. The application has the effect of reducing construction difficulty.

Description

Technical Field

[0001] This application relates to the technical field of foundation pit construction, and in particular to a method for connecting vertical shafts and open-cut foundation pit nodes. Background Technology

[0002] As people's lives develop faster and faster, cities are also developing faster and faster. Urban construction requires the construction of a large number of subways to improve urban development. Subway construction usually includes two important parts: shafts and foundation pits. There is a certain distance between the shafts and the foundation pits. Construction requires connecting the shafts and the foundation pits to facilitate train and personnel passage, and the foundation pits also need to be supported.

[0003] The usual support method is to drive piles between the shaft and the foundation pit to support the foundation pit. However, the construction space for pile driving is small, and the construction is difficult and inconvenient. Then, excavation is carried out from the shaft towards the foundation pit to connect the shaft and the foundation pit.

[0004] Regarding the aforementioned technologies, the inventors believe that the piling equipment is large and difficult to fix, and the distance between the shaft and the foundation pit is small, making piling difficult and construction challenging. Summary of the Invention

[0005] In order to reduce the difficulty of construction, this application provides a method for connecting vertical shafts and open-cut foundation pits.

[0006] The present application provides a method for connecting vertical shafts and open-cut foundation pits using the following technical solution:

[0007] A method for connecting vertical shafts and open-cut foundation pits includes the following steps:

[0008] S1. Excavate the soil to the bottom of the shaft and connect multiple grid components to the shaft;

[0009] S2, Construction pit retaining structure, excavate the soil to the foundation, and connect multiple grid components with the reinforcement of the pit retaining piles during excavation;

[0010] S3, hanging mesh, the end of the shotcrete closed grid assembly near the reinforcing bars of the foundation pit retaining pile.

[0011] By adopting the above technical solution, when it is necessary to support the foundation pit and connect the shaft and the foundation pit, multiple grid components are used to connect the steel bars of the shaft and the foundation pit retaining piles. After the connection is completed, concrete is poured, which completes the support of the foundation pit and the connection of the shaft and the foundation pit, avoiding pile driving, thereby greatly reducing the construction difficulty and achieving the effect of reducing construction difficulty.

[0012] Optionally, in step S1, a steel plate is embedded on the side of the shaft near the grid assembly, and multiple grid assemblies are connected to the steel plate.

[0013] By adopting the above technical solution, the steel plate is set up so that when connecting the grid assembly and the shaft, the grid assembly and the steel plate are connected, making the connection more solid and connecting the grid assembly to the shaft, thus achieving the effect of connecting the grid assembly and the shaft.

[0014] Optionally, in step S1, the grid assembly includes two horizontal bars and multiple connecting rods. The two horizontal bars are arranged in parallel, and the multiple connecting rods are installed between the two horizontal bars. One horizontal bar is installed on a steel plate, and the other horizontal bar is installed on the reinforcing steel of the foundation pit retaining pile.

[0015] By adopting the above technical solution, multiple connecting rods are installed between two horizontal bars, thereby connecting the two horizontal bars. One horizontal bar is connected to the shaft, and the other horizontal bar is connected to the reinforcing steel of the foundation pit retaining pile, thus connecting the shaft and the foundation pit, and simultaneously completing the support of the foundation pit, reducing the construction difficulty and achieving the effect of reducing construction difficulty.

[0016] Optionally, one end of the connecting rod is fixedly connected to a crossbar near the reinforcing bars of the foundation pit retaining pile, and an extension rod is provided at the end of the connecting rod away from the reinforcing bars of the foundation pit retaining pile. One end of the extension rod is embedded in the connecting rod, and the extension rod and the connecting rod are slidably connected. The sliding direction is perpendicular to the length direction of the crossbar.

[0017] By adopting the above technical solution, when the distance between the shaft and the foundation pit is different, the sliding extension rod and connecting rod can be used to adjust the distance between the two horizontal bars to match the distance between the shaft and the foundation pit. Then, the horizontal bars can be connected to the shaft and the reinforcing steel of the foundation pit retaining piles to complete the connection between the shaft and the foundation pit, thus achieving the effect of being applicable to different shafts and foundation pits.

[0018] Optionally, the connecting rod has a through hole, the extension rod has multiple fixing slots, and the connecting rod is provided with a positioning rod, which passes through the through hole and is embedded in any one of the fixing slots.

[0019] By adopting the above technical solution, when it is necessary to slide the extension rod and connecting rod, the positioning rod is pulled out, and the extension rod and connecting rod are slid to adjust the overall length of the extension rod and connecting rod. When the extension rod and connecting rod are adjusted to the required length, the positioning rod is re-passed through the through hole and embedded in the fixing groove to fix the extension rod and connecting rod, thereby achieving the effect of fixing the extension rod and connecting rod.

[0020] Optionally, a spring is fixed to the positioning rod with a ring, and the spring, positioning rod and connecting rod are all fixedly connected. When the positioning rod passes through the through hole and is embedded in any of the fixed slots, the spring is in its natural state.

[0021] By adopting the above technical solution, when it is necessary to adjust the distance between the crossbars, the positioning rod is pulled out, and the extension rod and connecting rod are slid to adjust the overall distance between the extension rod and the connecting rod, thereby adjusting the distance between the crossbars. When the distance between the crossbars is adjusted to the required distance, the positioning rod is released, and under the action of the spring, the positioning rod springs back into the fixing groove, achieving a convenient and quick effect.

[0022] Optionally, a starting rod is provided at one end of the external fixing groove of the positioning rod, and the starting rod and one end of the external fixing groove of all positioning rods are fixedly connected.

[0023] By adopting the above technical solution, when it is necessary to adjust the distance between the crossbars, all the positioning rods need to be pulled out at the same time before adjustment. Then, the starting rod is pulled out, thereby pulling out all the positioning rods at the same time, achieving a convenient and quick effect.

[0024] Optionally, two connecting plates are slidably installed on the crossbar near the reinforcing bars of the foundation pit retaining pile. When the grid assembly is installed, the reinforcing bars of the foundation pit retaining pile are embedded between the two connecting plates.

[0025] By adopting the above technical solution, the connecting plate connects the grid assembly and the reinforcing steel of the foundation pit retaining pile, thus achieving the effect of connecting the shaft and the foundation pit.

[0026] Optionally, a groove is provided on the crossbar near the reinforcing bars of the foundation pit retaining pile. Both connecting plates are embedded in the groove and slide in the groove. Threaded rods are provided on the two connecting plates. The threaded rods pass through the two connecting plates and are threadedly connected to the two connecting plates. The threads at both ends of the threaded rods turn in opposite directions. A limit plate is fixed at one end of the crossbar. The threaded rods pass through the limit plate and are rotatably connected to the limit plate.

[0027] By adopting the above technical solution, when it is necessary to connect the grid assembly and the foundation pit retaining pile reinforcement, the foundation pit retaining pile reinforcement is placed between two connecting plates. By rotating the threaded rod, the two connecting plates will move closer to each other until the two connecting plates clamp the foundation pit retaining pile reinforcement, thus completing the connection between the grid assembly and the foundation pit retaining pile reinforcement and achieving the effect of connecting the grid assembly and the foundation pit retaining pile reinforcement.

[0028] Optionally, the crossbar near the steel plate is fixed to the steel plate.

[0029] By adopting the above technical solution, the crossbar is fixed on the steel plate, and the steel plate is pre-embedded in the vertical shaft, thus achieving the effect of connecting the vertical shaft and the foundation pit.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. The installation of grille components, crossbars, and connecting rods reduces the difficulty of construction;

[0032] 2. The extension rods are designed to adapt to different shafts and foundation pits;

[0033] 3. The extension rod and connecting rod are fixed by means of holes, fixing slots and positioning rods;

[0034] 4. The spring and starter lever are designed for convenience and speed;

[0035] 5. The connection plate, slide, threaded rod, and limit plate are designed to connect the shaft and the foundation pit. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0037] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0038] In the diagram, 1 is the grille assembly; 11 is the crossbar; 12 is the connecting rod; 13 is the through hole; 14 is the positioning rod; 2 is the extension rod; 21 is the fixing groove; 3 is the spring; 4 is the starting rod; 5 is the connecting plate; 6 is the slide groove; 7 is the threaded rod; and 8 is the limiting plate. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0040] This application discloses a method for connecting vertical shafts and open-cut foundation pit nodes.

[0041] A method for connecting vertical shafts and open-cut foundation pits includes the following steps:

[0042] S1. Reference Figure 1 Excavate the shaft to the bottom, and pre-embed a steel plate on the side of the shaft near the foundation pit. The length of the steel plate is the same as the length of the shaft and the steel plate is perpendicular to the ground. Install the grid assembly 1 on the steel plate, and the grid assembly 1 is parallel to the ground.

[0043] Reference Figure 1 and Figure 2 The grid assembly 1 includes two horizontal bars 11 and multiple connecting rods 12. The two horizontal bars 11 are arranged in parallel and are parallel to the ground and the steel plate. One of the horizontal bars 11 is fixedly connected to the steel plate. The multiple connecting rods 12 are arranged in parallel and are perpendicular to the horizontal bars 11. One end of each connecting rod 12 is fixedly connected to a horizontal bar 11 away from the steel plate. The multiple connecting rods 12 are placed between two horizontal bars 11, and the spacing between the multiple connecting rods 12 is the same.

[0044] An extension rod 2 is provided at the end of the connecting rod 12 away from the crossbar 11. The length direction of the extension rod 2 is the same as that of the connecting rod 12. One end of the extension rod 2 is embedded in the connecting rod 12. The end of the extension rod 2 that is exposed outside the connecting rod 12 is fixedly connected to the crossbar 11 near the steel plate. The extension rod 2 and the connecting rod 12 are slidably connected, and the sliding direction is set along the length direction of the connecting rod 12.

[0045] The connecting rod 12 has a through hole 13 at the end away from the crossbar 11. The extension rod 2 has multiple fixing slots 21. The length direction of the fixing slots 21 is perpendicular to the length direction of the extension rod 2. The multiple fixing slots 21 are equally spaced along the length direction of the extension rod 2. The connecting rod 12 is provided with a positioning rod 14. The positioning rod 14 passes through the through hole 13 and is embedded in any one of the fixing slots 21. At this time, the length direction of the positioning rod 14 is the same as the length direction of the fixing slot 21. The positioning rod 14, the connecting rod 12, and the extension rod 2 are all slidably connected. The sliding direction is set along the length direction of the fixing slot 21.

[0046] A spring 3 is provided on the positioning rod 14. The length direction of the spring 3 is the same as that of the positioning rod 14. One end of the spring 3 is fixedly connected to one end of the external connecting rod 12 of the positioning rod 14, and the other end of the spring 3 is fixedly connected to the outer wall of the connecting rod 12. When the positioning rod 14 passes through the through hole 13 and is embedded in any of the fixing slots 21, the spring 3 is in its natural state. A starting rod 4 is provided at one end of the external fixing slot 21 of the positioning rod 14. The starting rod 4 is fixedly connected to one end of the external fixing slot 21 of all the positioning rods 14. The starting rod 4 is parallel to the crossbar 11.

[0047] When it is necessary to connect the grid assembly 1 and the shaft, the crossbar 11 is fixed on the steel plate, the starting rod 4 is pulled to pull out the positioning rod 14, the extension rod 2 is slid to adjust the distance between the two crossbars 11, and when the required distance is reached, the starting rod 4 is released and all the positioning rods 14 spring back, thereby fixing the extension rod 2 and the connecting rod 12, and the adjustment is completed.

[0048] S2, Reference Figure 1 The construction pit retaining structure connects the grid assembly 1 with the reinforcing bars of the pit retaining piles.

[0049] Reference Figure 1 Two connecting plates 5 are provided on the crossbar 11 away from the steel plate. The two connecting plates 5 are arranged in parallel and are perpendicular to the crossbar 11. A sliding groove 6 is provided on the crossbar 11 away from the steel plate. The length direction of the sliding groove 6 is the same as the length direction of the crossbar 11. The two connecting plates 5 are embedded in the sliding groove 6 and slide in the sliding groove 6.

[0050] One end of the crossbar 11 is fixed with a limiting plate 8. The limiting plate 8 and the connecting plate 5 are parallel. A threaded rod 7 is provided on the limiting plate 8. The threaded rod 7 passes through both the limiting plate 8 and the two connecting plates 5. The length direction of the threaded rod 7 is the same as the length direction of the crossbar 11. The threaded rod 7 and the limiting plate 8 are rotatably connected. The rotation axis is set along the length direction of the threaded rod 7. The threaded rod 7 and the two connecting plates 5 are threadedly connected. The threads at both ends of the threaded rod 7 have opposite directions. The two connecting plates 5 are always located at different threads on the threaded rod 7. When the threaded rod 7 is rotated, the two connecting plates 5 move closer or further away from each other. The reinforcing bars of the foundation pit retaining pile are embedded between the two connecting plates 5.

[0051] When it is necessary to connect the grid assembly 1 and the foundation pit retaining pile reinforcement, tighten the threaded rod 7 so that the two connecting plates 5 are far apart and placed outside the foundation pit retaining pile reinforcement. Then tighten the threaded rod 7 again so that the two connecting plates 5 are close to each other until they clamp the foundation pit retaining pile reinforcement, thus completing the connection of the grid assembly 1 to the foundation pit retaining pile reinforcement.

[0052] S3. Reference Figure 1 Hang the wire mesh, spray concrete to close the end of the grid assembly 1 near the reinforcing steel of the foundation pit retaining pile, continue to excavate the soil for 1-2m, and repeatedly install the grid assembly. Multiple grid assemblies 1 are set at equal intervals along the length of the steel plate until the foundation pit is excavated to the base, thus completing the support of the foundation pit and connecting the shaft and the foundation pit.

[0053] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for connecting vertical shafts and open-cut foundation pits, characterized in that: Includes the following steps: S1. Excavate the soil in the vertical shaft to the bottom of the shaft and connect multiple grid components (1) to the vertical shaft; S2, Construction of foundation pit retaining structure, excavation of soil to the foundation, during excavation, multiple grid components (1) are connected together with the foundation pit retaining pile reinforcement; S3, wire mesh, shotcrete closed grid assembly (1) near the end of the foundation pit retaining pile reinforcement; In step S1, a steel plate is embedded on the side of the vertical shaft near the grid assembly (1), and multiple grid assemblies (1) are connected to the steel plate; In step S1, the grid assembly (1) includes two horizontal bars (11) and multiple connecting rods (12). The two horizontal bars (11) are arranged in parallel, and the multiple connecting rods (12) are installed between the two horizontal bars (11). One horizontal bar (11) is installed on the steel plate, and the other horizontal bar (11) is installed on the reinforcing steel of the foundation pit retaining pile. One end of the connecting rod (12) is fixedly connected to the crossbar (11) near the reinforcing bar of the foundation pit retaining pile. An extension rod (2) is provided at the end of the connecting rod (12) away from the reinforcing bar of the foundation pit. One end of the extension rod (2) is embedded in the connecting rod (12). The extension rod (2) and the connecting rod (12) are slidably connected. The sliding direction is perpendicular to the length direction of the crossbar (11). Two connecting plates (5) are slidably installed on the crossbar (11) near the reinforcing bars of the foundation pit retaining pile. When the grid assembly (1) is installed, the reinforcing bars of the foundation pit retaining pile are embedded between the two connecting plates (5).

2. The method for connecting vertical shafts and open-cut foundation pits according to claim 1, characterized in that: The connecting rod (12) has a through hole (13), the extension rod (2) has multiple fixing slots (21), and the connecting rod (12) is provided with a positioning rod (14). The positioning rod (14) passes through the through hole (13) and is embedded in any one of the fixing slots (21).

3. The method for connecting vertical shafts and open-cut foundation pits according to claim 2, characterized in that: A spring (3) is fixed on the positioning rod (14). The spring (3), positioning rod (14), and connecting rod (12) are all fixedly connected. When the positioning rod (14) passes through the through hole (13) and is embedded in any fixed groove (21), the spring (3) is in its natural state.

4. The method for connecting vertical shafts and open-cut foundation pits according to claim 3, characterized in that: A starting rod (4) is provided at one end of the external fixing groove (21) of the positioning rod (14), and the starting rod (4) and one end of the external fixing groove (21) of all positioning rods (14) are fixedly connected.

5. The method for connecting vertical shafts and open-cut foundation pits according to claim 1, characterized in that: A groove (6) is provided on the horizontal bar (11) near the reinforcing pile of the foundation pit. Two connecting plates (5) are embedded in the groove (6) and slide in the groove (6). Threaded rods (7) are provided on the two connecting plates (5). The threaded rods (7) pass through the two connecting plates (5) and are threadedly connected to the two connecting plates (5). The threads at both ends of the threaded rods (7) are turned in opposite directions. A limiting plate (8) is fixed at one end of the horizontal bar (11). The threaded rods (7) pass through the limiting plate (8) and are rotatably connected to the limiting plate (8).

6. The method for connecting vertical shafts and open-cut foundation pits according to claim 1, characterized in that: The crossbar (11) near the steel plate is fixed to the steel plate.

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