Anti-blocking drainage device and method for foundation pit support water seepage

Abstract

The anti-blocking drainage device comprises a supporting plate with a cavity, a plurality of flow guide assemblies are arranged on the front end face of the supporting plate in the horizontal direction, and grooves are formed in the positions, between every two adjacent flow guide assemblies, of the front end face of the supporting plate; a plurality of water permeable holes are formed in the side wall of each groove, the water permeable holes communicate with the cavity, and the flow guide assembly can guide water seeping out of the soil surface into the grooves, and the water enters the cavity through the water permeable holes to be collected; a water diversion device is arranged on the front end face of the supporting plate and used for being inserted into soil, so that water in the soil enters the water diversion device under the action of pressure difference and flows into the cavity to be collected, the supporting plate and the cast-in-place piles work cooperatively, a foundation pit can be stably supported, the collapse phenomenon of the foundation pit is avoided, and the supporting effect is good. And the supporting plate adopts a porous structure and a reasonable flow channel layout, so that water flow can be effectively guided to quickly flow in, and the drainage speed is increased.

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] Furthermore, 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 respective through holes are provided 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 penetrates through the front end face of the support plate and extends to the rear end 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 passes through the through opening and is hingedly connected to the water diversion pipe.

[0008] Furthermore, the outer circumferential surface of the water diversion cylinder is provided with a plurality of water diversion grooves arranged along the length direction, the water diversion grooves are connected with the cavity, and the diversion assembly includes a plurality of diversion blocks arranged along the vertical direction of the support plate, and the diversion blocks are in a V-shaped structure.

[0009] Furthermore, connecting pipes are provided at the lower parts of the left and right sides of the rear end surface of the supporting plate, and the connecting pipes are connected to the cavity. The connecting pipes between two adjacent supporting plates can be connected by a water pipe.

[0010] Furthermore, 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.

[0011] Furthermore, a plurality of connection seats are provided on both sides of the rear end surface of the support plate, and a plurality of mounting holes are opened on the connection seats, through which the connection seats are used to realize detachable connection with the bolts on the cast-in-place piles.

[0012] Furthermore, 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 connected to the cavity.

[0013] Furthermore, the water permeable holes are arranged to be inclined downward.

[0014] Furthermore, the filter plate is detachably installed in the support plate, the upper end surface of the support plate is provided with a sewage outlet, a sealing door is hingedly installed on the sewage outlet, and the sewage outlet is used to take out the filter plate to clean the impurities thereon.

[0015] A method for supporting the above-mentioned anti-blocking drainage device comprises the following steps: 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 connecting seat is inserted into the expansion bolt, screw in the nut to fix it, and complete the installation of the support plate.

[0016] S6. Connect two adjacent connecting pipes on every two adjacent supporting plates through a water pipe.

[0017] Furthermore, the expansion bolt implantation method in step S3 is: drilling a hole on the cast-in-place pile, inserting the expansion bolt into the drilled hole, and gently tapping the bolt head with a hammer so that the expanded part thereof completely enters the wall.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The support plate and the bored piles of the present invention work together to provide stable support for the foundation pit and prevent it from collapsing. The support plate adopts a porous structure and a reasonable flow channel layout, which can effectively guide the rapid inflow of water, not only improving the drainage speed, but also evenly distributing the water flow to avoid the occurrence of local water accumulation on the pit wall. It can quickly block water and drain water as soon as water seepage occurs on the pit wall to prevent disasters.

[0019] The present invention can quickly form the seepage and convergence capacity by arranging a water diversion device that can be embedded in the pit wall, and can quickly discharge the seepage and collection of 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 plate supporting the pit wall and improving the overall support effect of the support structure. 3. The various 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 cost of purchasing water pumps. At the same time, the water collected in the support plates can be quickly discharged, reducing the overall drainage pressure of the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the present invention in an assembled state; Figure 2 It is a rear view of the present invention in an assembled state; Figure 3 It is the assembly split diagram of the present invention; Figure 4 It is a schematic structural diagram of a water diversion device of the anti-blocking drainage device of the present invention; Figure 5 It is a schematic diagram of the interior of the support plate of the anti-blocking drainage device of the present invention; Figure 6 It is a schematic diagram of the retracted state of the water diversion pipe of the anti-blocking drainage device of the present invention; Figure 7 for Figure 6 A partial enlarged view of point A in the middle.

[0021] In the figure, supporting plate-1, groove-2, water permeable hole-3, water diversion cylinder-4, water diversion pipe-5, through hole-6, cone head-7, water inlet hole-8, support seat-9, screw rod-10, gripping part-11, driving block-12, connecting rod-13, water diversion groove-14, connecting pipe-15, filter plate-16, connecting seat-17, mounting hole-18, vent-19, cast-in-place pile-20, guide block-21, support column-22. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figures 1 to 7 As shown, it includes a supporting plate 1 with a cavity, and a plurality of guide components are arranged on the front end surface of the supporting plate 1 in the horizontal direction, and a groove 2 is opened at the position between two adjacent guide components on the front end surface of the supporting plate 1, and a plurality of water-permeable holes 3 are opened on the side wall of each groove 2, and the water-permeable holes 3 are connected with the cavity, and the guide component can guide the water seeping from the soil surface to flow into the groove 2, and enter the cavity through the water-permeable holes 3 for collection; the front end surface of the supporting plate 1 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.

[0024] See also Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, the water diversion device includes a water diversion cylinder 4, a driving assembly and a plurality of water diversion pipes 5. One end of the water diversion cylinder 4 is fixedly mounted on the front end surface of the support plate 1. The outer peripheral surface of the other end of the water diversion cylinder 4 is provided with a plurality of through holes 6 at equal intervals, and each through hole 6 is movably equipped with a water diversion pipe 5. The driving assembly is connected to each water diversion pipe 5, so as to control the water diversion pipe 5 to extend or retract from the water diversion cylinder 4. A cone head 7 is provided at the outer end of the water diversion pipe 5, and a plurality of water inlet holes 8 are provided on the outer peripheral wall of the water diversion pipe 5. When installing the support plate 1, a hole that is compatible with the water diversion tube 4 needs to be opened on the pit wall, so that the water diversion tube 4 can be extended into the hole during installation. Digging the hole will change the pressure distribution inside the soil. The formation of the hole will cause a pressure difference between the hole and the surrounding soil. This pressure difference will prompt the soil moisture to flow from the higher pressure area to the lower pressure area, that is, from the surrounding soil to the hole, to balance the pressure difference. When there is moisture on the inner wall of the foundation pit, the water flow will flow to the water diversion tube 4 at the first time and flow into the cavity through the water diversion tube 4, which can draw out the moisture contained in the soil to prevent excessive moisture in the soil from causing soil erosion; and the design of the water diversion tube 4 can also increase the friction between it and the soil, making the support plate 1 more firmly fixed.

[0025] See 1 and Figure 4 As shown, the driving assembly includes a support seat 9, a screw rod 10 and a gripping portion 11. The support seat 9 is fixedly mounted on the front end inner wall of the water diversion cylinder 4. A plurality of support columns 22 corresponding to the respective through holes 6 are arranged on the support seat 9. The respective water diversion pipes 5 are slidably assembled in the corresponding support columns 22, and the gripping portion 11 is rotationally assembled on the rear end face of the support plate 1; one end of the screw rod 10 is rotationally arranged on the support seat 9, and the other end extends to the rear end of the support plate 1 after passing through the front end face of the support plate 1, and is connected to the gripping portion 11. The portion of the screw rod 10 located in the water diversion cylinder 4 is threadedly connected to a driving block 12, and a plurality of connecting rods 13 corresponding to the respective water diversion pipes 5 are hingedly connected to the driving block 12. A through opening is opened on each support column 22, and the other end of the connecting rod 13 is hingedly connected to the water diversion pipe 5 after passing through the through opening.

[0026] When encountering a loose soil environment, the staff can rotate the grip 11 to control the rotation of the screw 10 to drive the drive block 12 to move forward, thereby pushing the water pipe 5 out of the water cylinder 4 through the connecting rod 13 and inserting it into the surrounding soil; after the water pipe 5 is inserted into the soil, it will form an "interlocking" state with the soil, so that the soil forms a relatively stable area near the support plate 1. The soil in this area is constrained by the water pipe 5 and supported by the support plate 1, and its overall stability is improved. It can better resist the effects of external loads and prevent the foundation pit from collapsing. It also plays a role similar to "anchoring", which can effectively improve the pull-out resistance of the support plate 1. When the support plate 1 is subjected to tension or the soil slips, it can provide additional pull-out resistance to prevent the support plate 1 from being pulled out or displaced; and the water pipe 5 is set to assist the water pipe 5 in diverting water and expand the confluence range of the water pipe 5.

[0027] See also Figure 6 and Figure 7As shown, the outer circumference of the water guide cylinder 4 is provided with a plurality of water guide grooves 14 arranged along the length direction, the water guide grooves 14 are connected to the cavity, and the guide assembly includes a plurality of guide blocks 21 arranged in a vertical direction along the support plate 1, and the guide blocks 21 are in a V-shaped structure; The water diversion groove 14 is provided so that a gap is formed between the outer wall of the water diversion cylinder 4 and the hole in the pit wall, so that the water flowing to the surface of the water diversion cylinder 4 can be guided into the cavity, thereby accelerating the inflow of water. On the one hand, the design of the guide block 21 and the groove 2 can increase the contact area between the support plate 1 and the soil through the concave-convex structure, thereby increasing the friction between the two; friction is an important factor for the support structure to resist the lateral pressure of the soil. The greater the friction, the better the stability of the support plate 1, which can more effectively resist the lateral thrust of the soil and prevent the support plate 1 from displacement or overturning, and the structure can exert a certain lateral constraint on the pit wall. When the soil is constrained by the support plate 1, its lateral deformation will be limited, thereby reducing the displacement and settlement of the soil; on the other hand, the guide block 21 can well guide the water seeping from the pit wall surface into the groove 2, and flow into the cavity through the water permeable hole 3 on the side wall of the groove 2. The reason why the water permeable hole 3 is not allowed to directly contact the pit wall surface is to prevent water from carrying mud and sand directly into the water permeable hole 3. The water permeable hole 3 is set on the side to avoid direct impact of mud and sand water to prevent the water permeable hole 3 from being blocked.

[0028] See also Figure 2 and Figure 3 As shown, connecting pipes 15 are provided at the lower parts of the left and right sides of the rear end surface of the support plate 1, and the connecting pipes 15 are connected to the cavity. The connecting pipes 15 between two adjacent support plates 1 can be connected by a water pipe, and the cavities in each support plate 1 are connected by the water pipe, so that the accumulated water therein will maintain the same liquid level under the principle of the connecting pipe. Therefore, it only needs to connect the connecting pipe 15 of one of the support plates 1 to the water pump, and the accumulated water in all the support plates 1 can be pumped out by one water pump, without the need to use too many water pumps.

[0029] See also Figure 2 and Figure 3 As shown, a filter plate 16 is provided in the cavity for filtering impurities in the seepage water, and the filter plate 16 is assembled in the cavity in a state of being gradually tilted forward from top to bottom; the filter plate 16 can effectively block the silt in the water, thereby preventing the silt from clogging the connecting pipe 15, and the advantage of the inclined design is that the silt blocked on the filter plate 16 will slide to the bottom under the action of gravity, thereby preventing the silt from adhering to the filter plate 16 and affecting the filtering effect, and at the same time, even if the silt accumulates at the bottom of the cavity, the subsequent infiltrated water can also be filtered from the upper part of the inclined filter plate 16 to the other side.

[0030] See also Figure 2 and Figure 3As shown, a plurality of connection seats 17 are provided on both sides of the rear end surface of the support plate 1, and a plurality of mounting holes 18 are opened on the connection seats 17. The connection seats 17 are used to be detachably connected with the bolts on the cast-in-place piles 20 through the mounting holes 18. This installation method is convenient for recycling the support plate 1 for reuse during the demolition process after the project is completed.

[0031] See also Figure 2 As shown, a plurality of ventilation holes 19 are provided on the upper portion of the rear end surface of the support plate 1, and the ventilation holes 19 are connected with the cavity. By providing the ventilation holes 19 to connect with the cavity, the air in the cavity can be exchanged with the outside world, and 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 holes 19, thereby accelerating the drying of the seepage pit wall, and the outside hot air can also enter the cavity through the ventilation holes 19, and contact the pit wall along the air-permeable holes and the water diversion device to assist in drying.

[0032] A supporting method using the above-mentioned anti-blocking drainage device comprises the following steps: S1, excavating a plurality of pile holes at the construction site; placing a steel cage in each pile hole and pouring concrete, and forming a cast-in-place pile 20 after the concrete solidifies; S3, excavating a foundation pit at the construction site, and implanting a plurality of expansion bolts on the exposed surface of the cast-in-place pile 20; S4. Drill holes on the pit wall between every two adjacent cast-in-place piles 20, and install a support plate 1 between every two adjacent cast-in-place piles 20, wherein the water diversion cylinder 4 abuts against the hole in the pit wall. The staff rotates the gripping part 11 to drive the driving block 12 to move forward through the screw rod 10, thereby pushing the water diversion pipe 5 out of the water diversion cylinder 4 through the connecting rod 13 and inserting it into the surrounding soil; S5. After the mounting hole 18 of the connecting seat 17 is inserted into the expansion bolt, the nut is screwed in to fix it, and the installation of the supporting plate 1 is completed.

[0033] S6. Connect two adjacent connecting pipes 15 on every two adjacent supporting plates 1 through a water pipe, and then connect the connecting pipe of a supporting plate in each group of supporting plates to a water pump, and a liquid level sensor can be installed in the cavity of the supporting plate to monitor the water level condition in real time.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in 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 supporting plate with a cavity, wherein a plurality of flow guide components are arranged on the front end surface of the supporting plate in the horizontal direction, and a groove is provided at a position between two adjacent flow guide components on the front end surface of the supporting plate, 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, and the flow 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; a water diversion device is arranged on the front end surface of the supporting 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.

2. The anti-blocking and drainage device for foundation pit support water seepage according to claim 1 is characterized by: 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 installed 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.

3. The anti-blocking and drainage device for foundation pit support water seepage according to claim 2 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.

4. The anti-blocking and drainage device for foundation pit support water seepage according to claim 2, characterized in that: The outer circumferential surface of the water diversion cylinder is provided with a plurality of water diversion grooves arranged along the length direction, and the water diversion grooves are connected with the cavity. The diversion assembly includes a plurality of diversion blocks arranged in a vertical direction along the supporting plate, and the diversion blocks are in a V-shaped structure.

5. The anti-blocking and drainage device for foundation pit support water seepage according to claim 2, characterized in that: Connecting pipes are provided at the lower parts of the left and right sides of the rear end surface of the supporting plate. The connecting pipes are communicated with the cavity. The connecting pipes between two adjacent supporting plates can be connected by a water pipe.

6. A device for preventing and draining water from seepage in foundation pit support according to claim 1 or 5, 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.

7. 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.

8. 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.

9. The method for supporting an anti-blocking drainage device according to claim 5, 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 connecting seat is inserted into the expansion bolt, screw in the nut to fix it, and complete the installation of the support plate.

10. The method for supporting a blocking and drainage device according to claim 9, characterized in that: Also includes: S6. Connect two adjacent connecting pipes on every two adjacent supporting plates through a water pipe.

Images