Drainage structure at the bottom of foundation pit caisson

Abstract

The utility model provides a drainage structure at the bottom of a foundation pit caisson, including a foundation pit body, a vertical shaft is opened in the middle of the foundation pit body, a protective tube is sleeved in the vertical shaft, the outer peripheral wall of the protective tube is opened with evenly distributed water seepage holes, the outer peripheral wall of the protective tube is provided with a plurality of drainage pipes evenly distributed in the circumferential direction, the drainage pipe is arranged near the top of the protective tube, the bottom of the protective tube is open and a filter plate near the bottom is detachably connected therein, and a drainage pump is arranged in the protective tube. In the utility model, a vertical shaft is stuck in the middle of the foundation pit, and then a protective tube is arranged in the vertical shaft, and a plurality of drainage pipes are arranged on the outer periphery of the protective tube, the drainage pipes drain the water in the foundation pit into the protective tube, this arrangement does not require the excavation of drainage grooves located on the inner wall of the foundation pit, and thus does not cause the problem of the inner wall of the foundation pit sliding due to the excavation of the drainage grooves, thereby improving the efficiency of the support and installation of the inner wall of the foundation pit.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit construction, in particular to a drainage structure at the bottom of a foundation pit caisson. Background Art

[0002] The open drainage method is one of the commonly used methods for foundation pit drainage. A water collection well is set at the bottom of the foundation pit, and a drainage ditch is excavated around or in the center of the bottom of the pit to allow water to flow into the water collection well, and then pumped away with a water pump. In view of the above-mentioned related technologies, the inventor believes that the relevant foundation pit drainage has high requirements for the compactness of the soil wall around the foundation pit. If the soil wall around the foundation pit is loose, it is easy to slide into the drainage ditch under the erosion of water flow, affecting the foundation pit drainage effect.

[0003] The utility model with the publication number CN214784090U proposes a deep foundation pit drainage structure, which belongs to the field of foundation pit construction, including a foundation pit body and a drainage component arranged in the foundation pit body, wherein the inner walls around the foundation pit body are set as foundation pit slopes, and also includes a support component, wherein the bottom surface of the foundation pit body is provided with a drainage groove near the foundation pit slope, wherein the drainage component includes a water pump and a drainage pipe laid on the foundation pit slope, wherein the water pump is connected with the drainage groove through the drainage pipe, wherein the support component includes a plurality of support plates, wherein the support plates are laid on the foundation pit slope, wherein the plurality of support plates are arranged along the height direction of the foundation pit slope, wherein the support plates are located between the drainage pipe and the foundation pit slope, and wherein the drainage pipe is connected with the foundation pit slope through the support plates. The present application strengthens the supporting and stabilizing effect on the foundation pit slope during drainage, thereby making the soil of the foundation pit slope more compact and less likely to slide under the erosion of water flow, thereby ensuring the stability of drainage of the foundation pit body.

[0004] However, the above drainage structure still has the following deficiencies when in use: 1. The drainage ditch is close to the inner wall of the foundation pit body, and there is a problem that the side wall of the foundation pit may collapse easily when the drainage ditch is excavated. In other words, the position of the drainage ditch is unreasonable, which may not only cause the side wall of the foundation pit to collapse, but also affect the support treatment of the side wall of the foundation pit; 2. After the drainage ditch is excavated, it is easy to be eroded by water flow, which may cause the drainage ditch to be easily buried by soil, reduce the efficiency of rainwater flowing to the water pump position, and thus affect the drainage effect.

[0005] To this end, the utility model provides a drainage structure at the bottom of a foundation pit caisson. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a drainage structure at the bottom of a foundation pit caisson to solve the problems raised in the above-mentioned background technology. The utility model has the advantages of more convenient installation of the inner wall support of the foundation pit, and also has the advantages of smoother water diversion and drainage.

[0007] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a drainage structure at the bottom of a foundation pit caisson, including a foundation pit body, a vertical shaft is opened in the middle of the foundation pit body, a protective tube is arranged in the vertical shaft, the outer peripheral wall of the protective tube is opened with evenly distributed seepage holes, the outer peripheral wall of the protective tube is provided with a plurality of drainage pipes evenly distributed in the circumferential direction, the drainage pipes are arranged near the top of the protective tube, the bottom of the protective tube is open and a filter plate near the bottom is detachably connected therein, and a drainage pump is arranged in the protective tube.

[0008] Furthermore, a groove adapted to the drainage pipe is provided at the bottom of the foundation pit body, and water holes evenly distributed in the circumferential direction are provided on the outer peripheral wall of the drainage pipe.

[0009] Furthermore, an annular positioning plate is sleeved on the outer periphery of the filter plate, and a hanging frame connected to the top of the protective tube is arranged on the top of the annular positioning plate.

[0010] Furthermore, the suspension frame includes a supporting ring and a suspension rod, the outer diameter of the supporting ring is larger than the inner diameter of the protective tube, and the bottom of the supporting ring is welded to the suspension rod and the annular positioning plate.

[0011] Furthermore, the protective tube is conical with the small end facing downward, and the outer edge of the annular positioning plate abuts against the inner conical wall of the protective tube.

[0012] Furthermore, a reinforcement ring is provided on the top fixing sleeve outside the protective tube, a plurality of main anchor rods uniformly distributed circumferentially are welded to the bottom of the reinforcement ring, and a row of secondary anchor rods is welded to the bottom of the drainage tube.

[0013] Furthermore, a transfer tube close to the top is welded to the outer peripheral wall of the protective tube, and one end of the drainage tube is plug-connected to the transfer tube.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. In the utility model, a vertical shaft is arranged in the middle of the foundation pit, and then a protective cylinder is arranged in the vertical shaft. A plurality of drainage pipes are arranged on the outer periphery of the protective cylinder. The drainage pipes drain the water in the foundation pit into the protective cylinder. This arrangement does not require the excavation of drainage grooves on the inner wall of the foundation pit, and thus does not cause the problem of the inner wall of the foundation pit sliding due to the excavation of drainage grooves, thereby improving the efficiency of the support installation of the inner wall of the foundation pit.

[0016] 2. In the utility model, evenly distributed seepage holes are opened on the outer peripheral wall of the protective tube. The water flow between the soil outside the vertical shaft will enter the protective tube through the seepage holes. The drainage pipe will drain the water at the bottom of the foundation pit into the protective tube. The drainage pump in the protective tube will discharge the collected water to the outside to realize the drainage function. This arrangement can improve the efficiency of water collection and drainage.

[0017] 3. In the utility model, a groove adapted to the drainage pipe is opened at the bottom of the foundation pit body, and water holes evenly distributed circumferentially are opened on the outer wall of the drainage pipe. The water in the foundation pit enters the drainage pipe through the water holes and then gathers into the protective tube. This arrangement can realize the transmission and collection of water without digging drainage grooves, which greatly improves the smoothness of drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the protective tube, drainage pipe and filter plate of the bottom drainage structure of the foundation pit caisson of the utility model after explosion and expansion;

[0019] Figure 2 for Figure 1 The structural diagram at the bottom;

[0020] Figure 3 for Figure 1 Schematic diagram after assembly and separation of the foundation pit body.

[0021] In the figure: 1. foundation pit body; 11. groove; 2. vertical shaft; 3. protective tube; 31. reinforcement ring; 311. main anchor rod; 33. transfer pipe; 4. seepage hole; 5. drainage pipe; 51. water hole; 52. auxiliary anchor rod; 7. filter plate; 71. annular positioning plate; 711. suspension bracket; 7111. support ring; 7112. suspension rod; 8. drainage pump. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] See also Figures 1 to 3 The utility model provides a technical solution: a drainage structure at the bottom of a foundation pit caisson, including a foundation pit body 1, a vertical shaft 2 is opened in the middle of the foundation pit body 1, and a protective tube 3 is arranged inside the vertical shaft 2. When in use, the outer wall of the protective tube 3 and the inner wall of the vertical shaft 2 are fitted together to reinforce the vertical shaft 2. The outer peripheral wall of the protective tube 3 is provided with evenly distributed seepage holes 4. Part of the water flow between the soil layers will enter the protective tube 3 through the seepage holes 4, thereby realizing the collection of part of the water body.

[0024] Furthermore, the outer wall of the protective tube 3 is provided with a plurality of drainage pipes 5 evenly distributed in the circumferential direction. The drainage pipes 5 are arranged near the top of the protective tube 3 and are installed at the bottom of the foundation pit body 1 when in use. The function of the drainage pipes 5 is to drain water far away from the shaft 2 into the protective tube 3.

[0025] Therefore, the drainage structure composed of the drainage pipe 5 and the protective tube 3 for transmitting and collecting water does not affect the installation of the foundation pit side wall support, thereby improving the efficiency of the installation of the foundation pit side wall support.

[0026] The bottom of the protective cylinder 3 is open and a filter plate 7 near the bottom is detachably connected therein. The filter plate 7 is used to filter the sludge at the bottom of the protective cylinder 3. A drainage pump 8 is placed inside the protective cylinder 3. The drainage pump 8 is located above the filter plate 7. When in use, the water outlet of the drainage pump 8 is connected to a drainage pipe. When the drainage pump 8 is started, the water can be discharged to the outside of the foundation pit.

[0027] Specifically, an annular positioning plate 71 is provided on the outer periphery of the filter plate 7, and a hanging bracket 711 connected to the top of the protective tube 3 is provided on the top of the annular positioning plate 71. That is to say, the filter plate 7 is connected to the protective tube 3 through the hanging bracket 711. When the filter plate 7 needs to be removed, it is only necessary to lift the hanging bracket 711.

[0028] In this embodiment, a groove 11 adapted to the drainage pipe 5 is provided at the bottom of the foundation pit body 1, and water holes 51 evenly distributed circumferentially are provided on the outer wall of the drainage pipe 5. The drainage pipe 5 collects water in the foundation pit through the water holes 51 thereon, and the groove 11 is used to support the drainage pipe 5. This arrangement does not require the excavation of a drainage ditch, and thus there will be no problem of drainage ditch collapse affecting water transmission.

[0029] Furthermore, the suspension frame 711 includes a supporting ring 7111 and a hanging rod 7112. The outer diameter of the supporting ring 7111 is larger than the inner diameter of the protective tube 3. The bottom of the supporting ring 7111 is welded and connected to the annular positioning plate 71 through the hanging rod 7112. When in use, the annular positioning plate 71 is placed on the top of the protective tube 3, and the hanging rod 7112 serves to suspend the annular positioning plate 71.

[0030] In this embodiment, the protective tube 3 is conical with the small end facing downward, and the outer edge of the annular positioning plate 71 abuts against the inner cone wall of the protective tube 3. This arrangement can improve the sealing degree of the contact between the annular positioning plate 71 and the protective tube 3, so that the filter plate 7 can fully play the role of filtering the water.

[0031] In this embodiment, a reinforcement ring 31 is provided on the top fixed sleeve outside the protective tube 3, and a plurality of main anchor rods 311 uniformly distributed circumferentially are welded to the bottom of the reinforcement ring 31. After the protective tube 3 is installed in the vertical shaft 2, the main anchor rods 311 will be inserted into the soil, thereby improving the tightness of the connection between the protective tube 3 and the vertical shaft 2. A row of secondary anchor rods 52 are welded to the bottom of the drainage tube 5. When in use, the row of secondary anchor rods 52 will be inserted into the bottom of the groove 11, thereby improving the tightness of the installation between the drainage tube 5 and the bottom of the foundation pit, and can also solidify the soil in the foundation pit.

[0032] Furthermore, the outer wall of the protective tube 3 is welded with a transfer tube 33 near the top, and one end of the drainage tube 5 is plugged into the transfer tube 33. The purpose of this arrangement is to facilitate the separate installation of the protective tube 3 and the drainage tube 5. That is to say, during installation, the protective tube 3 is first inserted into the shaft 2 and is in a fastened connection state, and then the drainage tube 5 is inserted into the transfer tube 33, and finally the secondary anchor rod 52 and the main anchor rod 311 are inserted into the soil by knocking the drainage tube 5 and the protective tube 3 alternately.

[0033] Working principle: Before use, the drainage pipe 5 and the protective cylinder 3 are prefabricated, the shaft 2 and the groove 11 are excavated in the foundation pit body 1, and then the protective cylinder 3 and the drainage pipe 5 are installed. When it is used, the water formed by the seepage at the bottom of the foundation pit will enter the drainage pipe 5 through the water hole 51, and then flow into the protective cylinder 3. The water between the soil layers will enter the protective cylinder 3 through the seepage hole 4. The drainage pump 8 is started, and the water in the protective cylinder 3 is pumped out to the outside of the foundation pit body 1 to achieve the drainage function.

[0034] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A drainage structure at the bottom of a foundation pit caisson, comprising a foundation pit body (1), characterized in that: A vertical shaft (2) is provided in the middle of the foundation pit body (1), a protective tube (3) is provided in the vertical shaft (2), the outer peripheral wall of the protective tube (3) is provided with evenly distributed water seepage holes (4), the outer peripheral wall of the protective tube (3) is provided with a plurality of drainage pipes (5) evenly distributed in the circumferential direction, the drainage pipes (5) are provided near the top of the protective tube (3), the bottom of the protective tube (3) is open and a filter plate (7) near the bottom is detachably connected therein, and a drainage pump (8) is provided in the protective tube (3).

2. The bottom drainage structure of the foundation pit caisson according to claim 1 is characterized by: A groove (11) adapted to the drainage pipe (5) is provided at the bottom of the foundation pit body (1), and water holes (51) evenly distributed in the circumferential direction are provided on the outer peripheral wall of the drainage pipe (5).

3. The bottom drainage structure of the foundation pit caisson according to claim 1 is characterized by: An annular positioning plate (71) is sleeved on the outer periphery of the filter plate (7), and a hanging frame (711) connected to the top of the protective tube (3) is provided on the top of the annular positioning plate (71).

4. The bottom drainage structure of the foundation pit caisson according to claim 3 is characterized by: The suspension frame (711) comprises a support ring (7111) and a suspension rod (7112); the outer diameter of the support ring (7111) is larger than the inner diameter of the protective tube (3); and the bottom of the support ring (7111) is welded to the annular positioning plate (71) via the suspension rod (7112).

5. The bottom drainage structure of the foundation pit caisson according to claim 3 is characterized by: The protective tube (3) is conical in shape with its small end facing downwards, and the outer edge of the annular positioning plate (71) abuts against the inner conical wall of the protective tube (3).

6. The bottom drainage structure of the foundation pit caisson according to claim 2 is characterized by: A reinforcing ring (31) is provided on the top fixed sleeve outside the protective tube (3), a plurality of main anchor rods (311) uniformly distributed in the circumferential direction are welded to the bottom of the reinforcing ring (31), and a row of auxiliary anchor rods (52) are welded to the bottom of the drainage tube (5).

7. The bottom drainage structure of the foundation pit caisson according to claim 6 is characterized by: A transfer tube (33) close to the top is welded to the outer peripheral wall of the protective tube (3), and one end of the drainage tube (5) is plug-connected to the transfer tube (33).

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