An anti-blocking drainage device and method for seepage water in foundation pit support

Abstract

The present invention discloses a device and method for preventing and draining water seepage in foundation pit support, comprising a support plate with a cavity, a plurality of guide components are arranged on the front end surface of the support plate in a horizontal direction, and a groove is provided at a portion of the front end surface of the support plate between two adjacent guide components, and a plurality of water permeable holes are provided on the side wall of each groove, and the water permeable holes are connected with the cavity, and the guide components can guide water seeping from the soil surface to flow into the groove, and enter the cavity through the water permeable holes for collection; a water diversion device is arranged on the front end surface of the support plate, and the water diversion device is used to be inserted into the soil, so that the water in the soil enters the water diversion device under the action of pressure difference, and flows into the cavity for collection, the support plate and the bored pile of the present invention work together, can stably support the foundation pit and prevent it from collapsing, and the support plate adopts a porous structure and a reasonable flow channel layout, can effectively guide the water to flow in quickly, and improve the drainage speed.

Description

Technical Field

[0001] The invention relates to the technical field of foundation construction, and in particular to a device and method for preventing and draining water from seepage in foundation pit support. Background Art

[0002] Foundation pit support plays a vital role in modern construction projects, especially in the development of urban underground space. The main purpose of foundation pit support is to ensure the stability and safety of the foundation pit during the excavation process, and to prevent the collapse of the foundation pit and the damage to the surrounding environment. However, groundwater leakage is a common problem in the process of foundation pit support, which not only increases the difficulty of foundation pit support, but also may cause deformation and damage to the support structure.

[0003] At present, the support methods of foundation pit are usually cast-in-place piles or steel structure supports. The seepage water from the side walls of the foundation pit will flow to the bottom of the foundation pit, which has the defect of increasing the pressure on the overall drainage system of the foundation pit. Summary of the invention

[0004] The object of the present invention is to provide a device and method for preventing water seepage in foundation pit support, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a drainage device for preventing water seepage in foundation pit support, comprising a support plate with a cavity, a plurality of guide components are arranged on the front end surface of the support plate in the horizontal direction, and a groove is provided at a portion of the front end surface of the support plate located between two adjacent guide components, and a plurality of water-permeable holes are provided on the side wall of each of the grooves, and the water-permeable holes are connected with the cavity, the guide components can guide the water seeping from the soil surface to flow into the grooves, and enter the cavity through the water-permeable holes for collection; a water diversion device is arranged on the front end surface of the support plate, and the water diversion device is used to be inserted into the soil, so that the water in the soil enters the water diversion device under the action of the pressure difference, and flows into the cavity for collection.

[0006] Furthermore, the water diversion device includes a water diversion cylinder, a driving assembly and a plurality of water diversion pipes. One end of the water diversion cylinder is fixedly installed on the front end surface of the support plate, and the outer peripheral surface of the other end of the water diversion cylinder is provided with a plurality of through holes at equal intervals, and the water diversion pipe is movably assembled in each of the through holes. The driving assembly is connected to each water diversion pipe to control the water diversion pipe to extend or retract from the water diversion cylinder. A cone head is provided at the outer end of the water diversion pipe, and a plurality of water inlet holes are provided on the outer peripheral wall of the water diversion pipe.

[0007] Further, the driving component includes a support base, a lead screw, and a holding part. The support base is fixedly installed on the inner wall of the front end of the water diversion cylinder. A number of support columns corresponding to the respective through holes are provided on the support base. Each water diversion pipe is slidably assembled within a corresponding support column. The holding part is rotatably assembled on the rear end face of the support plate. One end of the lead screw is rotatably provided on the support base, and the other end passes through the front end face of the support plate and extends to the rear of the support plate and is connected to the holding part. A driving block is threadedly connected to the part of the lead screw located within the water diversion cylinder. A number of connecting rods corresponding to the respective water diversion pipes are hingedly connected to the driving block. Through openings are provided on each of the support columns. The other end of the connecting rod passes through the through opening and is hingedly connected to the water diversion pipe.

[0008] Further, a number of water diversion grooves are provided on the outer peripheral surface of the water diversion cylinder along the length direction. The water diversion grooves communicate with the cavity. The diversion component includes a plurality of diversion blocks arranged vertically along the support plate, and the diversion blocks are in a V-shaped structure.

[0009] Further, connecting pipes are provided at the lower parts of the left and right sides of the rear end face of the support plate. The connecting pipes communicate with the cavity. The connecting pipes between two adjacent support plates can be connected through a water pipe.

[0010] Further, a filter plate is provided within the cavity for filtering impurities in the seepage water, and the filter plate is assembled within the cavity in a state of gradually inclining forward from top to bottom.

[0011] Further, a number of connecting seats are provided on the left and right sides of the rear end face of the support plate. A number of mounting holes are provided on the connecting seats, and the connecting seats are used for detachably connecting with bolts on the cast-in-place pile through the mounting holes.

[0012] Further, a number of ventilation openings are provided in the upper part of the rear end face of the support plate. The ventilation openings communicate with the cavity.

[0013] Further, the water permeable holes are arranged in a downwardly inclined manner.

[0014] Further, the filter plate is detachably installed within the support plate. A dirt outlet is provided on the upper end face of the support plate. A sealing door is hingedly installed on the dirt outlet. The dirt outlet is used for taking out the filter plate to clean the impurities thereon.

[0015] A support method for the above anti-blocking drainage device includes the following steps:

[0016] S1. Excavate a number of pile holes at the construction site; lower steel reinforcement cages into each pile hole and pour concrete. After the concrete solidifies, cast-in-place piles are formed.

[0017] S3. Excavate a foundation pit at the construction site and implant a plurality of expansion bolts on the exposed surface of the cast-in-place pile.

[0018] S4. Drill holes in the pit wall between every two adjacent cast-in-place piles, and install a support plate between every two adjacent cast-in-place piles. Among them, the water diversion cylinder abuts against the hole in the pit wall, and then control the water diversion pipe to extend and insert into the surrounding soil.

[0019] S5. After the mounting hole of the connection seat is sleeved on the expansion bolt, screw in the nut to fix and complete the installation of the support plate.

[0020] S6. Connect the two adjacent connecting pipes on every two adjacent support plates through a water pipe.

[0021] Further, the method for implanting the expansion bolt in step S3 is as follows: Drill a hole in the cast-in-place pile, insert the expansion bolt into the drilled hole, and gently tap the bolt head with a hammer to make the expansion part completely enter the wall.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. The support plate and the cast-in-place pile of the present invention work together to stably support the foundation pit, avoid its collapse, and the support plate adopts a porous structure and a reasonable flow channel layout, which can effectively guide the water flow to flow in quickly. It not only improves the drainage speed, but also can evenly distribute the water flow, avoiding the occurrence of local water accumulation on the pit wall. It can quickly block and drain water at the first time when the pit wall seeps water to prevent disasters.

[0024] By setting a water diversion device that can be embedded in the pit wall, the present invention can quickly form the ability of seepage water confluence, and at the same time can quickly drain the seepage water collected on the side wall of the foundation pit, and make the support plate and the soil form a whole, thereby increasing the stability of the support of the support plate on the pit wall and improving the overall support effect of the support structure.

[0025] 3. The support plates of the present invention can be connected through water pipes, and only one water pump is needed to complete the drainage work of multiple support plates, saving the procurement cost of the water pump, and at the same time can quickly drain the water collected in the support plates, reducing the overall drainage pressure of the foundation pit. Description of the Drawings

[0026] Figure 1 It is the front view of the assembled state of the present invention;

[0027] Figure 2 It is the rear view of the assembled state of the present invention;

[0028] Figure 3 It is the exploded view of the assembly of the present invention;

[0029] Figure 4Schematic structural diagram of the water diversion device of the anti-blocking drainage device of the present invention;

[0030] Figure 5 Internal schematic diagram of the support plate of the anti-blocking drainage device of the present invention;

[0031] Figure 6 Schematic diagram of the retracted state of the water diversion pipe of the anti-blocking drainage device of the present invention;

[0032] Figure 7 is Figure 6 Partial enlarged view at position A in

[0033] In the figure, support plate - 1, groove - 2, permeable hole - 3, water diversion cylinder - 4, water diversion pipe - 5, through hole - 6, cone head - 7, water inlet hole - 8, support seat - 9, lead screw - 10, holding part - 11, drive block - 12, connecting rod - 13, water diversion groove - 14, connecting pipe - 15, filter plate - 16, connecting seat - 17, mounting hole - 18, ventilation opening - 19, cast-in-place pile - 20, diversion block - 21, support column - 22. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] As Figures 1 to 7 shown, it includes a support plate 1 with a cavity. A number of diversion components are arranged on the front end face of the support plate 1 along the horizontal direction. Grooves 2 are opened at the positions between two adjacent diversion components on the front end face of the support plate 1. A number of permeable holes 3 are opened on the side walls of each groove 2, and the permeable holes 3 are communicated with the cavity. The diversion components can guide the water seeping out from the soil surface into the grooves 2 and collect it into the cavity through the permeable holes 3; an water diversion device is arranged on the front end face of the support plate 1, and the water diversion device is used to be inserted into the soil, so that the water in the soil enters the water diversion device under the action of the pressure difference and flows into the cavity for collection.

[0036] Please refer to Figure 1 、 Figure 3 、 Figure 4 and Figure 6As shown, the water diversion device includes a water diversion cylinder 4, a drive assembly, and a plurality of water diversion pipes 5. One end of the water diversion cylinder 4 is fixedly installed on the front end face of the support plate 1. A plurality of through holes 6 are equidistantly arranged on the outer peripheral surface of the other end of the water diversion cylinder 4, and a water diversion pipe 5 is movably assembled in each through hole 6. The drive assembly is connected to each water diversion pipe 5 to control the water diversion pipe 5 to extend or retract from the water diversion cylinder 4. A conical head 7 is arranged at the outer end of the water diversion pipe 5, and a plurality of water inlet holes 8 are formed on the outer peripheral wall of the water diversion pipe 5;

[0037] When the support plate 1 is installed, a hole adapted to the water diversion cylinder 4 needs to be drilled in the pit wall so that the water diversion cylinder 4 can extend into the hole during installation. Drilling the hole will change the pressure distribution inside the soil, and the formation of the hole will cause a pressure difference between the inside of the hole and the surrounding soil. This pressure difference will cause the soil moisture to flow from the area with higher pressure to the area with lower pressure, that is, from the surrounding soil to the hole, to balance the pressure difference. Thus, when there is moisture in the inner wall of the foundation pit, the water flow will converge to the water diversion cylinder 4 for the first time and flow into the cavity through the water diversion cylinder 4. The moisture contained in the soil can be diverted and drained to prevent soil erosion caused by excessive moisture in the soil; moreover, the design of the water diversion cylinder 4 can also increase the friction force with the soil, making the support plate 1 fixed more firmly.

[0038] Please refer to Figures 1 and Figure 4 As shown, the drive assembly includes a support seat 9, a lead screw 10, and a gripping portion 11. The support seat 9 is fixedly installed on the inner wall of the front end of the water diversion cylinder 4. A plurality of support columns 22 corresponding to the through holes 6 are arranged on the support seat 9. Each water diversion pipe 5 is slidably assembled in the corresponding support column 22. The gripping portion 11 is rotatably assembled on the rear end face of the support plate 1; One end of the lead screw 10 is rotatably arranged on the support seat 9, and the other end passes through the front end face of the support plate 1 and extends to the rear end of the support plate 1 and is connected to the gripping portion 11. A drive block 12 is threadedly connected to the part of the lead screw 10 located inside the water diversion cylinder 4. A plurality of connecting rods 13 corresponding to the water diversion pipes 5 are hingedly connected to the drive block 12. Through holes are formed on each support column 22, and the other end of the connecting rod 13 passes through the through hole and is hingedly connected to the water diversion pipe 5.

[0039] When encountering an environment with relatively loose soil, the staff can rotate the holding part 11 to control the rotation of the lead screw 10 to drive the driving block 12 to move forward, so as to push the water diversion pipe 5 out of the water diversion cylinder 4 through the connecting rod 13 and insert it into the surrounding soil; after the water diversion pipe 5 is inserted into the soil, it will form an "interlocking" state with the soil mass, so that a relatively stable area is formed near the support plate 1. The soil mass in this area is restricted by the water diversion pipe 5 and supported by the support plate 1, so its overall stability is improved, it can better resist the action of external loads, prevent the foundation pit from collapsing, and play a role similar to "anchoring", which can effectively improve the uplift resistance of the support plate 1. When the support plate 1 is subjected to tensile force or the soil mass slips, it can provide additional uplift resistance to prevent the support plate 1 from being pulled out or displaced; and the water diversion pipe 5 is provided to assist the water diversion of the water diversion pipe 5 and expand the confluence range of the water diversion pipe 5.

[0040] Please refer to Figure 6 and Figure 7 As shown, a plurality of water diversion grooves 14 arranged along the length direction are formed on the outer peripheral surface of the water diversion cylinder 4, and the water diversion grooves 14 communicate with the cavity. The diversion assembly includes a plurality of diversion blocks 21 arranged along the vertical direction of the support plate 1, and the diversion blocks 21 are of a V-shaped structure;

[0041] The formation of the water diversion grooves 14 creates a gap between the outer wall of the water diversion cylinder 4 and the hole in the pit wall, which can guide the water flowing to the surface of the water diversion cylinder 4 into the cavity, accelerating the inflow of water;

[0042] The design of the diversion blocks 21 and the grooves 2 can, on the one hand, increase the contact area between the support plate 1 and the soil mass through the concave-convex structure, thereby increasing the friction force between the two; the friction force is an important factor for the support structure to resist the lateral pressure of the soil mass. The greater the friction force, the better the stability of the support plate 1, and it can more effectively resist the lateral thrust of the soil mass to prevent the support plate 1 from shifting or overturning, and this structure can exert a certain lateral restraint force on the pit wall. When the soil mass is restricted by the support plate 1, its lateral deformation will be restricted, thereby reducing the displacement and settlement of the soil mass; on the other hand, the diversion blocks 21 can well guide the water seeping out from the surface of the pit wall into the grooves 2 and flow into the cavity through the water permeable holes 3 on the side walls of the grooves 2. The reason for not allowing the water permeable holes 3 to be in direct contact with the surface of the pit wall is to prevent water from carrying sediment and directly flowing into the water permeable holes 3. The water permeable holes 3 are arranged on the side to avoid direct impact of sediment-laden water to prevent the water permeable holes 3 from being blocked.

[0043] Please refer to Figure 2 and Figure 3As shown in the figure, connecting pipes 15 are provided at the lower parts on both the left and right sides of the rear end face of the support plate 1. The connecting pipes 15 communicate with the cavity. The connecting pipes 15 between two adjacent support plates 1 can be connected through water pipes, and the cavities in each support plate 1 are connected through the water pipes, so that the accumulated water in them will keep the liquid level the same under the principle of the connecting pipe. Therefore, only by connecting the connecting pipe 15 of one of the support plates 1 to the water pump, all the accumulated water in the support plates 1 can be pumped away and discharged by one water pump, without the need to match too many water pumps.

[0044] Please refer to Figure 2 and Figure 3 As shown in the figure, a filter plate 16 is arranged in the cavity to filter impurities in the seepage water, and the filter plate 16 is assembled in the cavity in a state of gradually inclining forward from top to bottom; the filter plate 16 can effectively block the sediment in the water, thus preventing the sediment from blocking the connecting pipe 15. The advantage of the inclined design is that the sediment blocked on the filter plate 16 will slide down to the bottom under the action of gravity, thus preventing the sediment from adhering to the filter plate 16 and affecting the filtering effect. At the same time, even if the sediment accumulates at the bottom of the cavity, the subsequent infiltrating water can still be filtered from the upper part of the inclined filter plate 16 to the other side.

[0045] Please refer to Figure 2 and Figure 3 As shown in the figure, a number of connecting seats 17 are provided on both the left and right sides of the rear end face of the support plate 1. A number of mounting holes 18 are opened on the connecting seats 17, and the connecting seats 17 are used to detachably connect to the bolts on the cast-in-place pile 20 through the mounting holes 18. This mounting method is convenient for recycling the support plate 1 during the demolition process after the project is completed for reuse.

[0046] Please refer to Figure 2 As shown in the figure, a number of ventilation openings 19 are opened at the upper part of the rear end face of the support plate 1. The ventilation openings 19 communicate with the cavity. By opening the ventilation openings 19 to communicate with the inside of the cavity, the air in the cavity can be exchanged with the outside. The moisture on the pit wall can be discharged into the cavity through the water permeable holes 3, and the water vapor in the cavity is then discharged through the ventilation openings 19, thus accelerating the drying of the seepage pit wall. Moreover, the outside hot air can also enter the cavity through the ventilation openings 19 and contact the pit wall along the air permeable holes and the water diversion device to assist in drying.

[0047] A support method applying the anti-blocking drainage device described above includes the following steps:

[0048] S1. Excavate a number of pile holes at the construction site; lower the steel reinforcement cages into each pile hole and pour concrete. After the concrete solidifies, form the cast-in-place piles 20;

[0049] S3. Excavate the foundation pit at the construction site and implant a number of expansion bolts on the exposed surface of the cast-in-place pile 20;

[0050] S4. Drill holes in the pit wall between every two adjacent cast-in-place piles 20, and install the support plate 1 between every two adjacent cast-in-place piles 20. Among them, the water diversion cylinder 4 abuts against the hole in the pit wall. The worker rotates the holding part 11 to drive the driving block 12 to move forward through the screw rod 10, so as to push the water diversion pipe 5 out of the water diversion cylinder 4 through the connecting rod 13 and insert it into the surrounding soil;

[0051] S5. After the expansion bolt is inserted into the installation hole 18 of the connecting seat 17, screw in the nut to fix it, and complete the installation of the support plate 1.

[0052] S6. Connect the two adjacent connecting pipes 15 on every two adjacent support plates 1 through a water pipe, and then connect the connecting pipe of a certain support plate in each group of support plates to the water pump. A liquid level sensor can be installed in the cavity of this support plate to monitor the water level condition in real time.

[0053] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A drainage device for preventing water seepage in foundation pit support, characterized in that: It comprises a support plate with a cavity, wherein the front end surface of the support plate is provided with a plurality of guide components in the horizontal direction, and the portion of the front end surface of the support plate between two adjacent guide components is provided with a groove, and the side wall of each groove is provided with a plurality of water permeable holes, and the water permeable holes are connected with the cavity, and the guide component can guide the water seeping from the soil surface to flow into the groove, and enter the cavity through the water permeable holes for collection; the front end surface of the support plate is provided with a water diversion device, and the water diversion device is used to be inserted into the soil, so that the water in the soil enters the water diversion device under the action of the pressure difference, and flows into the cavity for collection; The water diversion device includes a water diversion cylinder, a driving assembly and a plurality of water diversion pipes, one end of the water diversion cylinder is fixedly installed on the front end surface of the support plate, and a plurality of through holes are evenly spaced on the outer peripheral surface of the other end of the water diversion cylinder, and the water diversion pipe is movably assembled in each of the through holes, the driving assembly is connected with each water diversion pipe, so as to control the water diversion pipe to extend or retract from the water diversion cylinder, a cone head is provided at the outer end of the water diversion pipe, and a plurality of water inlet holes are provided on the outer peripheral wall of the water diversion pipe; a plurality of water diversion grooves are provided on the outer peripheral surface of the water diversion cylinder along the length direction, and the water diversion grooves are connected with the cavity, the guide assembly includes a plurality of guide blocks arranged in a vertical direction of the support plate, and the guide blocks are in a V-shaped structure, and connecting pipes are provided on the lower parts of the left and right sides of the rear end surface of the support plate, and the connecting pipes are connected with the cavity, and the connecting pipes between two adjacent support plates are connected by water pipes.

2. The anti-blocking and drainage device for foundation pit support water seepage according to claim 1 is characterized by: The driving assembly includes a support seat, a screw rod and a holding portion, the support seat is fixedly installed on the front end inner wall of the water diversion cylinder, and a plurality of support columns corresponding to the through holes are arranged on the support seat, and each of the water diversion pipes is slidably assembled in the corresponding support column, and the holding portion is rotatably assembled on the rear end face of the support plate; one end of the screw rod is rotatably arranged on the support seat, and the other end extends to the rear end of the support plate after passing through the front end face of the support plate and is connected to the holding portion, and the part of the screw rod located in the water diversion cylinder is threadedly connected to a driving block, and a plurality of connecting rods corresponding to each of the water diversion pipes are hingedly connected to the driving block, and a through opening is opened on each of the support columns, and the other end of the connecting rod is hingedly connected to the water diversion pipe after passing through the through opening.

3. The anti-blocking and drainage device for foundation pit support water seepage according to claim 1, characterized in that: A filter plate is arranged in the cavity for filtering impurities in the seepage water, and the filter plate is assembled in the cavity in a state of gradually tilting forward from top to bottom.

4. The anti-blocking and drainage device for foundation pit support water seepage according to claim 1, characterized in that: A plurality of connection seats are arranged on both sides of the rear end surface of the support plate. A plurality of mounting holes are opened on the connection seats. The connection seats are used to realize detachable connection with the bolts on the cast-in-place piles through the mounting holes.

5. The anti-blocking and drainage device for foundation pit support water seepage according to claim 1, characterized in that: A plurality of ventilation holes are provided on the upper portion of the rear end surface of the support plate, and the ventilation holes are communicated with the cavity.

6. The method for supporting an anti-blocking drainage device according to claim 1, characterized in that: The steps include: S1. Excavate multiple pile holes at the construction site; place a steel cage in each pile hole and pour concrete, and form a cast-in-place pile after the concrete solidifies; S3. Excavate a foundation pit at the construction site and implant multiple expansion bolts on the exposed surface of the cast-in-place piles; S4, drilling holes on the pit wall between every two adjacent cast-in-place piles, and installing a supporting plate between every two adjacent cast-in-place piles, wherein the water diversion tube abuts against the hole in the pit wall, and then controlling the water diversion tube to extend and insert into the surrounding soil; S5. After the installation hole of the connection seat is inserted into the expansion bolt, screw in the nut to fix it, and the installation of the support plate is completed; S6. Connect two adjacent connecting pipes on every two adjacent supporting plates through a water pipe.

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