Foundation pit top waterproof structure for construction

Abstract

The utility model relates to the technical field of foundation pit waterproofing, in particular to a construction foundation pit top waterproof structure which comprises a foundation trench, a water blocking groove, a water blocking wall body, an inclined table, a cushion layer, a stiffening pipe and an anchoring structure. A circle of foundation trench with the depth being 30 cm is formed in the inner edge of the top of the foundation pit, the water retaining wall is installed in the foundation trench, the height of the top face of the water retaining wall is 50-80 cm higher than that of the top face of the foundation pit, a stiffening pipe of a V-shaped structure is horizontally inserted into the corner of the water retaining wall, and an anchoring structure for tying the water retaining wall is arranged between the stiffening pipe and the top of the foundation pit. According to the utility model, the stiffening pipe with the V-shaped structure is arranged on the original water retaining wall body and is matched with the anchoring structure carried on the stiffening pipe, so that a tying effect is formed between each corner of the water retaining wall body and the soil layer far away from the top of the foundation pit, and the stability of the water retaining wall body is improved; and fracture and instability of the water retaining wall caused by landslide and collapse of a soil layer around the top of the foundation pit are prevented, and the lasting waterproof and water retaining effects are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit waterproofing, in particular to a waterproof structure for a construction foundation pit top. Background Art

[0002] In the field of construction, large-scale foundation pit construction sub-projects are the most common. After the foundation pit is excavated, the foundation structure of the building structure must be constructed in the foundation pit. For places with high groundwater levels, pressure reduction and drainage facilities must be installed. Therefore, the foundation pit is exposed for a long time and waterproofing measures need to be taken on the top of the pit. In addition to setting up rainproof structures above the foundation pit, it is also necessary to prevent ground rainwater from flowing into the foundation pit from the top of the pit, causing the soil layer in the foundation pit to be soaked and disturbed by water, affecting construction operations.

[0003] The current waterproofing measures for the top of the foundation pit generally adopt the method of setting up a retaining wall around the top of the foundation pit to block the surrounding water flow. However, this retaining wall is a structure independent of the top surface of the foundation pit, has low weight, and has no stable connection with the foundation pit support structure. It is easy to collapse and break with the displacement and settlement of the soil layer around the foundation pit, affecting the water retaining and waterproofing effect.

[0004] Therefore, in view of the fact that the existing foundation pit top waterproof wall is easily deformed and cracked due to the settlement and displacement of the foundation pit top soil layer, which affects the waterproof and water-retaining effect, a foundation pit top water retaining wall can be designed that can be anchored deep into the soil layer to improve the stability of the water retaining wall. Utility Model Content

[0005] In order to overcome the problem that the existing foundation pit top waterproof wall is easily deformed and cracked due to the settlement and displacement of the foundation pit top soil layer, which affects the waterproof and water-blocking effect.

[0006] The technical solution of the utility model is: a waterproof structure for the top of a construction foundation pit, comprising a foundation trench, a water retaining trench and a water retaining wall, an inclined platform, a cushion layer, a stiffening pipe and an anchoring structure; a foundation trench with a depth of 30 cm is opened at the inner edge of the foundation pit top, a water retaining trench with a depth of 50 cm is arranged along the outer circumference of the foundation trench, the water retaining wall is installed in the foundation trench and the top surface of the water retaining wall is 50-80 cm higher than the top surface of the foundation pit, the outer wall of the water retaining wall is an inclined platform with a slope of 60 degrees, the bottom surface of the inclined platform falls on the top surface of the foundation pit, a stiffening pipe with a V-shaped structure is horizontally inserted into the corner of the water retaining wall, and an anchoring structure for connecting the water retaining wall is arranged between the stiffening pipe and the top of the foundation pit.

[0007] Preferably, after the foundation pit is excavated, a foundation trench with a depth of 30 cm and a width of more than 50 cm and a water retaining ditch with a depth of 50 cm are constructed on the top surface of the foundation pit. The reinforcing pipes are pre-installed at the corners of the foundation trench through brackets, and then the water retaining wall is cast into the foundation trench as a whole. After the concrete wraps the reinforcing pipes, the anchoring structure is used to fix the reinforcing pipes to the soil layer outside the foundation pit, so that a pulling effect is formed between the corners of the water retaining wall and the soil layer away from the top of the foundation pit, thereby improving the stability of the water retaining wall. When surface rainwater flows into the foundation pit, it will first enter the water retaining ditch and finally be discharged from the lower part of the water retaining ditch. When the water volume is large, the inclined platform and the water retaining wall will also isolate the water outside the top surface of the foundation pit, ensuring lasting waterproofing and water retaining effects.

[0008] Preferably, a cushion layer covering the inner wall of the retaining trough is integrally cast at the foot of the slope at the lower end of the ramp. The cushion layer is composed of a lower layer of graded crushed stone and an upper layer of C20 plain concrete. Before casting the retaining wall, graded crushed stone with a thickness of 5-10 cm is laid in the retaining trough. Then, when pouring the concrete of the retaining wall or making the retaining wall by brickwork, the upper layer of C20 plain concrete in the cushion layer is poured simultaneously to cover the inner wall soil layer of the retaining trough to prevent rainwater from seeping into the soil layer in the drainage trough.

[0009] Preferably, the corner of the reinforcing pipe is opposite to the inner corner of the inner wall of the retaining wall, the outer wall of the straight pipe of the reinforcing pipe is coated with an isolation agent and penetrates from the inner wall of the retaining wall and exits from the outer wall. The length of the straight pipe of the reinforcing pipe passing through the water retaining wall is 1m, and the straight pipe of the reinforcing pipe is completely covered and fixed by the concrete of the water retaining wall. In actual application, a circle of water stop plates can be provided on the straight pipe of the reinforcing pipe to prevent the straight pipe of the reinforcing pipe from moving in the water retaining wall, and to prevent water from flowing into the foundation pit from the gap between the straight pipe of the reinforcing pipe and the water retaining wall. When constructing the support structure inside the foundation pit, the corner of the reinforcing pipe can be welded to the supporting steel pipe and steel frame to support the reinforcing pipe and the water retaining wall from the inside to the outside.

[0010] Preferably, the anchoring structure includes a socket and a No. 1 anchor rod; 2-5 sockets are equidistantly provided on the straight tube portion of the stiffening pipe, a steel No. 1 anchor rod is inserted into the sockets and the No. 1 anchor rod is inserted into the soil layer outside the foundation pit and penetrates 1.5-2m into the soil layer, the straight tube portion of the stiffening pipe extends 2-3m out of the inclined platform, the spacing between each socket is 50cm, the No. 1 anchor rod is inserted into the socket and the soil layer below, and with the help of the gripping force of the soil layer and the horizontal limiting effect between the No. 1 anchor rod and the No. 1 anchor rod, the stability of the stiffening pipe and the retaining wall fixed by the No. 1 anchor rod is improved.

[0011] Preferably, the anchoring structure includes a buckle, a No. 2 anchor rod and an anchor cable; a buckle is welded and fixed on the straight tube portion of the stiffening tube, the No. 2 anchor rod is inserted into the soil layer 5-10m away from the edge of the foundation pit top and penetrates 1.5-2m into the soil layer, and a taut anchor cable is fastened between the upper end of the No. 2 anchor rod and the corresponding buckle. The straight tube portion of the stiffening tube extends 1m out of the inclined platform, one end of the anchor cable is fastened to the buckle, and is tightened outward until the other end of the anchor cable is sufficiently away from the unstable soil layer area at the top of the foundation pit, and then the No. 2 anchor rod is fixed to the anchor cable at the other end of the anchor cable and inserted into the soil layer below. With the help of the gripping force of the soil layer and the horizontal limiting effect between the No. 2 anchor rod and the No. 2 anchor rod, the stability of the stiffening tube and the retaining wall fixed by the No. 2 anchor rod is improved.

[0012] Preferably, a water-drawing channel is integrally cast at the lower end of the retaining wall. The water-drawing channel is located in the soil layer below the foundation pit and is 50 cm from the bottom of the foundation pit. A water-drawing hole communicating with the water-drawing channel is provided on the upper surface of the retaining wall. An external pumping device connects the pumping pipe to the water-drawing hole to pump groundwater outwards, so that the top surface of the groundwater is 50 cm lower than the bottom of the foundation pit, thereby preventing the bottom of the foundation pit from being soaked.

[0013] Preferably, a stainless steel pipe extending upward into the retaining wall is implanted in the water-drawing channel, and the spacing between the connected water-drawing channels is 0.8-1.2m. The upper end of the retaining wall is covered with a cover plate to block the water-drawing hole. The water-drawing channel uses a stainless steel pipe and an outer concrete layer structure, which has a certain strength and is not easy to deform. The 0.8-1.2m spacing design ensures that when the groundwater is pumped out, the groundwater in each area drops evenly. When not pumping water, the water-drawing hole is covered with a cover plate to prevent rainwater or debris from entering the water-drawing hole.

[0014] Beneficial effects of the utility model:

[0015] 1. By installing a V-shaped stiffening pipe on the original retaining wall and cooperating with the anchoring structure on it, a tie effect is formed between the corners of the retaining wall and the soil layer away from the top of the foundation pit, thereby improving the stability of the retaining wall, preventing the soil layer around the top of the foundation pit from sliding and collapsing, which may cause the retaining wall to break and become unstable, and ensuring long-lasting waterproof and water-retaining effects;

[0016] 2. The V-shaped reinforcing pipes installed at the corners of the retaining wall can further strengthen the structural strength of the weak corners, and can be connected to the supporting structure in the foundation pit through welding or other means to further enhance the stability of the retaining wall.

[0017] 3. The water-drawing channel set on the retaining wall and penetrating into the soil layer below the foundation pit can not only drain the groundwater, but also form an anchor with the soil layer in the foundation pit, which has a stabilizing effect on the soil layer in the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the overall assembly of the three-dimensional structure of the construction pit top waterproof structure of the utility model;

[0019] Figure 2 Shown is a schematic diagram of the planar structure of the waterproof structure on the top of the foundation pit of the utility model;

[0020] Figure 3 Shown is a schematic diagram of the three-dimensional structure of the waterproof structure on the top of the foundation pit of the utility model;

[0021] Figure 4 Shown is a schematic diagram of the overall assembly three-dimensional structure of the construction foundation pit top waterproof structure of the utility model in another state;

[0022] Figure 5 Shown is a schematic diagram of the planar structure of the construction pit top waterproof structure of the utility model in another state;

[0023] Figure 6 Shown is a schematic diagram of the three-dimensional structure of the construction pit top waterproof structure of the utility model in another state;

[0024] Figure 7 Shown is a schematic diagram of the three-dimensional structure of the foundation pit top of the construction foundation pit waterproof structure of the utility model;

[0025] Figure 8 Shown is a partially enlarged three-dimensional structural schematic diagram of location A of the waterproof structure on the top of the foundation pit of the present invention;

[0026] Figure 9 Shown is a schematic diagram of the three-dimensional structure of the water-drawing channel of the construction foundation pit top waterproof structure of the present utility model.

[0027] Explanation of the accompanying reference numerals: 1. foundation trench; 2. water retaining trough; 3. water retaining wall; 4. inclined platform; 5. cushion layer; 6. reinforcing pipe; 8. water drawing channel; 9. water drawing hole; 701. socket; 702. anchor rod No. 1; 703. buckle; 704. anchor rod No. 2; 705. anchor cable. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] See also Figures 1-9The utility model provides a waterproof structure for the top of a foundation pit, including a foundation trench 1, a water retaining trench 2 and a water retaining wall 3, an inclined platform 4, a cushion layer 5, a stiffening pipe 6 and an anchoring structure; a foundation trench 1 with a depth of 30 cm is opened at the inner edge of the foundation pit top, a water retaining trench 2 with a depth of 50 cm is arranged along the outer circumference of the foundation trench 1, the water retaining wall 3 is installed in the foundation trench 1 and the top surface of the water retaining wall is 50-80 cm higher than the top surface of the foundation pit, the outer wall of the water retaining wall 3 is an inclined platform 4 with a slope of 60 degrees, the bottom surface of the inclined platform 4 falls on the top surface of the foundation pit, a V-shaped stiffening pipe 6 is horizontally inserted into the corner of the water retaining wall 3, and an anchoring structure for connecting the water retaining wall 3 is arranged between the stiffening pipe 6 and the top of the foundation pit. After the foundation pit is excavated, , a foundation trench 1 with a depth of 30 cm and a width of more than 50 cm and a retaining trench 2 with a depth of 50 cm are constructed on the top surface of the foundation pit. The stiffening pipes 6 are pre-installed at the corners of the foundation trench 1 through brackets, and then the retaining wall 3 is cast into the foundation trench 1 as a whole. After the concrete wraps the stiffening pipes 6, the anchoring structure is used to fix the stiffening pipes 6 to the soil layer outside the foundation pit, so that a pulling effect is formed between the corners of the retaining wall 3 and the soil layer away from the top of the foundation pit, thereby improving the stability of the retaining wall 3. When the rainwater on the surface flows into the foundation pit, it will first enter the retaining trench 2 and finally be discharged from the lower part of the retaining trench 2. When the water volume is large, the inclined platform 4 and the retaining wall 3 will also isolate the water outside the top surface of the foundation pit, ensuring lasting waterproofing and water-retaining effects.

[0030] See also Figures 1-6 、 Figure 7-Figure 8 , the slope foot at the lower end of the inclined platform 4 is integrally cast with a cushion layer 5 covering the inner wall of the water retaining trough 2. The cushion layer 5 is composed of a lower layer of graded crushed stone and an upper layer of C20 plain concrete. Before pouring the retaining wall 3, a graded crushed stone with a thickness of 5-10 cm is laid in the water retaining trough 2. Then, when pouring the concrete of the retaining wall 3 or making the retaining wall 3 by brickwork, the upper layer of C20 plain concrete in the cushion layer 5 is poured simultaneously to cover the inner wall soil layer of the water retaining trough 2 to prevent rainwater from seeping from the soil layer in the drainage trough. The corner point of the stiffening pipe 6 is opposite to the inner wall negative corner of the water retaining wall 3, and the outer wall of the straight pipe portion of the stiffening pipe 6 is coated with The isolation agent penetrates into the inner wall of the retaining wall 3 and exits from the outer wall. The straight pipe portion of the reinforcing pipe 6 that penetrates the water retaining wall 3 is 1m long. The straight pipe portion of the reinforcing pipe 6 is completely covered and fixed by the concrete of the water retaining wall 3. In actual application, a circle of water stop plates can be set on the straight pipe portion of the reinforcing pipe 6 to prevent the straight pipe portion of the reinforcing pipe 6 from moving in the water retaining wall 3, and to prevent water from flowing into the foundation pit from the gap between the straight pipe portion of the reinforcing pipe 6 and the water retaining wall 3. When constructing the support structure inside the foundation pit, the corner points of the reinforcing pipe 6 can be welded to the supporting steel pipes and steel frames to support the reinforcing pipe 6 and the water retaining wall 3 from the inside to the outside.

[0031] See also Figures 1-6 、 Figure 9The lower end of the retaining wall 3 is integrally cast with a water drawing channel 8. The water drawing channel 8 is in the soil layer below the foundation trench 1 and enters 50 cm from the bottom of the foundation pit. The upper surface of the retaining wall 3 is provided with a water drawing hole 9 that passes through the water drawing channel 8. An external pumping equipment connects the pumping pipe to the water drawing hole 9 to pump groundwater outward, so that the top surface of the groundwater is 50 cm lower than the bottom of the foundation pit to prevent the bottom of the foundation pit from being soaked. A stainless steel pipe extending upward into the retaining wall 3 is implanted in the water drawing channel 8. The spacing between the connected water drawing channels 8 is 0.8-1.2 m, and the upper end of the retaining wall 3 is covered with a cover plate for blocking the water drawing hole 9. The water drawing channel 8 uses a stainless steel pipe and an outer concrete layer structure, which has a certain strength and is not easy to deform. The 0.8-1.2 m spacing design ensures that when pumping groundwater, the groundwater in each area drops evenly. When not pumping water, the cover plate is used to cover the water drawing hole 9 to prevent rainwater or debris from entering the water drawing hole 9.

[0032] Example 1: Please refer to Figure 1-Figure 3 、 Figure 7-Figure 8 In this embodiment, the anchoring structure includes a socket 701 and a No. 1 anchor rod 702; 2-5 sockets 701 are equidistantly provided on the straight tube portion of the stiffening tube 6, and a steel No. 1 anchor rod 702 is inserted into the socket 701 and the No. 1 anchor rod 702 is inserted into the soil layer outside the foundation pit and penetrates 1.5-2m into the soil layer. The straight tube portion of the stiffening tube 6 extends out of the inclined platform 42-3m, and the spacing between each socket 701 is 50cm. The No. 1 anchor rod 702 is inserted into the socket 701 and the soil layer below. With the help of the gripping force of the soil layer and the horizontal limiting effect between the No. 1 anchor rod 702 and the No. 1 anchor rod 702, the stability of the stiffening tube 6 and the retaining wall 3 fixed by the No. 1 anchor rod 702 is improved.

[0033] Example 2: Please refer to Figure 4-Figure 8 In this embodiment, the anchoring structure includes a buckle 703, a second anchor rod 704 and an anchor cable 705; a buckle 703 is welded and fixed on the straight tube portion of the stiffening tube 6, the second anchor rod 704 is inserted into the soil layer 5-10m away from the top edge of the foundation pit and penetrates 1.5-2m into the soil layer, and a taut anchor cable 705 is fastened between the upper end of the second anchor rod 704 and the corresponding buckle 703. The straight tube portion of the stiffening tube 6 extends out of the inclined platform 41 m, tie one end of the anchor cable 705 to the buckle 703, and pull it outward until the other end of the anchor cable 705 is sufficiently away from the unstable soil layer area at the top of the foundation pit, then fix the No. 2 anchor rod 704 and the anchor cable 705 at the other end of the anchor cable 705 and insert them into the soil layer below. With the help of the gripping force of the soil layer and the horizontal limiting effect between the No. 2 anchor rod 704 and the anchor cable 705, the stability of the reinforcing pipe 6 and the retaining wall 3 fixed by the No. 2 anchor rod 704 is improved.

[0034] Through the above steps, by arranging a V-shaped reinforcing tube 6 on the original retaining wall 3 and cooperating with the anchoring structure carried thereon, a pulling effect is formed between the corners of the retaining wall 3 and the soil layer away from the top of the foundation pit, thereby improving the stability of the retaining wall 3, preventing the soil layer around the top of the foundation pit from sliding and collapsing, causing the retaining wall 3 to break and become unstable, and ensuring lasting waterproof and water-blocking effects, so as to solve the problem that the existing waterproof wall on the top of the foundation pit is easily deformed and cracked due to the settlement and displacement of the soil layer on the top of the foundation pit, thereby affecting the waterproof and water-blocking effects.

Claims

1. A construction foundation pit top waterproof structure, comprising a foundation trench (1), a water retaining trench (2) and a water retaining wall (3); characterized in that: The invention also comprises an inclined platform (4), a cushion layer (5), a stiffening pipe (6) and an anchoring structure; a foundation trench (1) with a depth of 30 cm is provided at the inner edge of the foundation pit top, a water retaining ditch (2) with a depth of 50 cm is provided along the outer circumference of the foundation trench (1), a water retaining wall (3) is installed in the foundation trench (1) and the top surface of the water retaining wall is 50-80 cm higher than the top surface of the foundation pit; the outer wall of the water retaining wall (3) is an inclined platform (4) with a slope of 60 degrees, the bottom surface of the inclined platform (4) falls on the top surface of the foundation pit, a V-shaped stiffening pipe (6) is horizontally inserted into the corner of the water retaining wall (3), and an anchoring structure for connecting the water retaining wall (3) is provided between the stiffening pipe (6) and the foundation pit top.

2. The construction pit top waterproof structure according to claim 1, characterized in that: A cushion layer (5) covering the inner wall of the water retaining channel (2) is integrally cast at the foot of the slope at the lower end of the inclined platform (4). The cushion layer (5) is composed of graded crushed stone in the lower layer and C20 plain concrete in the upper layer.

3. The construction pit top waterproof structure according to claim 1, characterized in that: The corner point of the reinforcing pipe (6) is opposite to the inner wall inner corner of the water retaining wall (3); the outer wall of the straight pipe portion of the reinforcing pipe (6) is coated with an isolation agent and penetrates through the inner wall of the water retaining wall (3) and exits through the outer wall; the length of the straight pipe portion of the reinforcing pipe (6) that penetrates the water retaining wall (3) is 1m.

4. The construction pit top waterproof structure according to claim 3, characterized in that: The anchoring structure comprises a socket (701) and a No. 1 anchor rod (702); 2-5 sockets (701) are equidistantly provided on the straight pipe portion of the stiffening pipe (6); a No. 1 steel anchor rod (702) is inserted into the socket (701), and the No. 1 anchor rod (702) is inserted into the soil layer outside the foundation pit and penetrates 1.5-2 meters into the soil layer.

5. The construction foundation pit top waterproof structure according to claim 3, characterized in that: The anchoring structure comprises a buckle (703), a second anchor rod (704) and an anchor cable (705); a buckle (703) is welded and fixed on the straight pipe portion of the stiffening pipe (6); the second anchor rod (704) is inserted into the soil layer 5-10m away from the top edge of the foundation pit and penetrates 1.5-2m into the soil layer; a taut anchor cable (705) is fastened between the upper end of the second anchor rod (704) and the corresponding buckle (703).

6. The construction pit top waterproof structure according to claim 1, characterized in that: The lower end of the retaining wall (3) is integrally cast with a water-drawing channel (8), which is located in the soil layer below the foundation trench (1) and extends 50 cm into the bottom of the foundation pit. The upper surface of the retaining wall (3) is provided with a water-drawing hole (9) that is in communication with the water-drawing channel (8).

7. The construction pit top waterproof structure according to claim 6, characterized in that: A stainless steel pipe extending upward into the water retaining wall (3) is implanted in the water drawing channel (8), the spacing between the connected water drawing channels (8) is 0.8-1.2m, and the upper end of the water retaining wall (3) is covered with a cover plate member that blocks the water drawing hole (9).

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