Local dewatering structure of foundation pit

Abstract

The utility model relates to a local dewatering structure of a foundation pit, which structurally comprises a water collecting pit positioned at the bottom of the foundation pit, a lower pre-embedded dewatering pipe positioned at the bottom of the water collecting pit and downwards inserted into a soil layer below, and an upper pre-embedded dewatering pipe detachably connected with the upper end of the lower pre-embedded dewatering pipe. The upper pre-embedded downcast pipe penetrates through the foundation cushion layer and the primary pouring foundation above the foundation cushion layer, a secondary pouring groove is formed in the primary pouring foundation, the upper end of the upper pre-embedded downcast pipe is located in the secondary pouring groove, a plugging cover is arranged at the top of the upper pre-embedded downcast pipe, and a waterproof layer is arranged between the foundation cushion layer and the primary pouring foundation. The waterproof layer wraps the upper portion of the upper pre-buried downcast pipe and the plugging cover, and a secondary pouring foundation is poured in the secondary pouring groove. The device is simple in structure, low in manufacturing cost, high in construction speed, high in dewatering speed, good in effect and capable of effectively preventing underground water from leaking.

Description

TECHNICAL FIELD

[0001] The utility model relates to a precipitation device, concretely to a local precipitation structure of foundation pit. BACKGROUND

[0002] In the process of carrying out the precipitation construction to the foundation pit, in the conventional method, one is to expand excavation at the bottom of the foundation pit, to make local precipitation well, and to set up drainage ditch to collect water and to mark, to reduce the water level to a certain height, and then to carry out the concrete cushion layer pouring construction, and then to make waterproof treatment, but the depth of the drainage ditch of the water collection and marking does not satisfy the local precipitation requirement of the elevator shaft and the water collecting pit, and the precipitation effect is poor, another method is to use well pipe to carry out precipitation, to arrange the precipitation well around the foundation pit to reduce the underground water level through the water pump, although the depth of the well pipe can satisfy the local precipitation requirement of the elevator shaft and the water collecting pit, but the cost is high, and the construction period is long. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a local precipitation structure of foundation pit to solve the problems of poor precipitation effect or high cost and long construction period of the existing local precipitation method of foundation pit.

[0004] The utility model is realized as follows: a local precipitation structure of foundation pit, including water collecting pit, lower pre-buried precipitation pipe, upper pre-buried precipitation pipe, blocking cover, foundation cushion layer, waterproof layer, primary pouring foundation, secondary pouring groove and secondary pouring foundation, the water collecting pit is located at the bottom of the foundation pit, the lower pre-buried precipitation pipe is located at the bottom of the water collecting pit and is inserted into the soil layer below, the upper end of the lower pre-buried precipitation pipe is detachably connected with the upper pre-buried precipitation pipe, the upper pre-buried precipitation pipe passes through the foundation cushion layer and the primary pouring foundation above the foundation cushion layer, the secondary pouring groove is arranged on the primary pouring foundation, the upper end of the upper pre-buried precipitation pipe is located in the secondary pouring groove, the blocking cover is arranged on the top of the upper pre-buried precipitation pipe, the waterproof layer is arranged between the foundation cushion layer and the primary pouring foundation, and the waterproof layer covers the upper part of the upper pre-buried precipitation pipe and the blocking cover, and the secondary pouring foundation is poured in the secondary pouring groove.

[0005] As a further improvement of the local precipitation structure of foundation pit of the utility model, a circle of water stop wing plates is arranged on the outer wall of the lower end of the upper pre-buried precipitation pipe, and the water stop wing plates are located in the foundation cushion layer.

[0006] As a further improvement of the local precipitation structure of foundation pit of the utility model, uniform water permeable holes are arranged on the outer wall of the lower pre-buried precipitation pipe.

[0007] As a further improvement of the local precipitation structure of foundation pit of the utility model, the lower end of the upper pre-buried precipitation pipe is connected with the upper end of the lower pre-buried precipitation pipe through threads.

[0008] As a further improvement to the local dewatering structure of the foundation pit of this utility model, the sealing cover is threadedly connected to the outer wall of the upper end of the pre-embedded dewatering pipe, and a water-stop rubber ring is provided inside the sealing cover.

[0009] As a further improvement to the local dewatering structure of the foundation pit of this utility model, the secondary pouring trough is a cup-shaped trough structure.

[0010] As a further improvement to the local dewatering structure of the foundation pit of this utility model, the lower end of the pre-embedded dewatering pipe is tapered.

[0011] This utility model can perform dewatering operations on foundation pits through pre-embedded dewatering pipes at the bottom, meeting the local dewatering depth requirements of elevator shafts and sump pits. It has a simple structure, low cost, fast construction speed, and fast and effective dewatering speed. At the same time, the top of the dewatering pipe can be effectively sealed by the sealing cover, waterproof layer and secondary pouring foundation in the secondary pouring trench to prevent groundwater leakage. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the present invention.

[0013] Figure 2 This is a reference drawing of this utility model.

[0014] Figure 3 This is a structural diagram of the lower pre-embedded dewatering pipe, the upper pre-embedded dewatering pipe, the sealing cover, and the water-stop wing plate of this utility model.

[0015] Figures 4-8 This is a construction process diagram of the foundation pit local dewatering structure of this utility model.

[0016] Figure 9 This is a cross-sectional view of the upper steel pipe of this utility model.

[0017] In the diagram: 1. Foundation pit; 2. Sump pit; 3. Lower embedded dewatering pipe; 4. Upper embedded dewatering pipe; 5. Water-stop wing plate; 6. Sealing cap; 7. Foundation cushion layer; 8. Waterproof layer; 9. Primary pouring foundation; 10. Secondary pouring trench; 11. Secondary pouring foundation; 12. Water-permeable hole; 13. Upper steel pipe. Detailed Implementation

[0018] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.

[0019] like Figure 1 , Figure 2 As shown, the partial dewatering structure of the foundation pit 1 of this utility model mainly includes a water collection pit 2, a lower pre-embedded dewatering pipe 3, an upper pre-embedded dewatering pipe 4, a sealing cover 6, a foundation pad 7, a waterproof layer 8, a primary pouring foundation 9, a secondary pouring trench 10, and a secondary pouring foundation 11.

[0020] Wherein, the water collecting pit 2 is located at the bottom of the foundation pit 1, the lower pre-buried dewatering pipe 3 is located at the bottom of the water collecting pit 2 and is inserted into the soil below, the depth of the lower pre-buried dewatering pipe 3 can be determined according to the dewatering requirement, and the upper pre-buried dewatering pipe 4 is located above the lower pre-buried dewatering pipe 3 and is connected with the lower pre-buried dewatering pipe 3.

[0021] The foundation cushion 7 and the primary pouring foundation 9 located above the foundation cushion 7 are located at the bottom of the water collecting pit 2 and serve as the foundation of the water collecting pit 2, the secondary pouring groove 10 is provided on the primary pouring foundation 9 and the position of the secondary pouring groove 10 corresponds to the position of the dewatering pipe, the upper pre-buried dewatering pipe 4 penetrates through the foundation cushion 7 and the primary pouring foundation 9 upwards and the upper end of the upper pre-buried dewatering pipe 4 extends into the secondary pouring groove 10, the height of the upper pre-buried dewatering pipe 4 is lower than the top surface of the primary pouring foundation 9, and the blocking cover 6 is provided at the top of the upper pre-buried dewatering pipe 4 to block the upper end of the upper pre-buried dewatering pipe 4, so that the upper end can be quickly closed to prevent the underground water from surging upwards.

[0022] The waterproof layer 8 is provided between the foundation cushion 7 and the primary pouring foundation 9 and covers the upper part of the upper pre-buried dewatering pipe 4 and the blocking cover 6, so that the entire dewatering pipe is sealed below by the waterproof layer 8 to effectively prevent the underground water from seeping.

[0023] Meanwhile, the secondary pouring foundation 11 is poured in the secondary pouring groove 10 and is made of micro-expansion concrete to completely seal the dewatering pipe in the foundation of the water collecting pit 2 and further prevent the underground water from seeping.

[0024] The lower end of the upper pre-buried dewatering pipe 4 is detachably connected with the upper end of the lower pre-buried dewatering pipe 3, and specifically, the lower end of the upper pre-buried dewatering pipe 4 is threadedly connected with the upper end of the lower pre-buried dewatering pipe 3.

[0025] A circle of water stopping wing plates 5 are provided on the outer wall of the lower end of the upper pre-buried dewatering pipe 4, and the water stopping wing plates 5 are poured in the foundation cushion 7 when the foundation cushion 7 is constructed, and preferably, the water stopping wing plates 5 are located in the middle of the thickness direction of the foundation cushion 7 to block the underground water from seeping upwards along the outer wall of the upper pre-buried dewatering pipe 4.

[0026] The blocking cover 6 is threadedly connected with the outer wall of the upper end of the upper pre-buried dewatering pipe 4, so that the blocking cover 6 can be quickly connected with the upper end of the upper pre-buried dewatering pipe 4 and sealed by the thread connection, and a water stopping rubber ring is provided in the blocking cover 6 to ensure the sealing between the blocking cover 6 and the upper pre-buried dewatering pipe 4.

[0027] The secondary pouring groove 10 is specifically a cup-shaped groove structure.

[0028] In order to facilitate the lower embedded precipitation pipe 3 to be inserted into the soil layer, the lower end of the lower embedded precipitation pipe 3 is tapered.

[0029] Uniform water-permeable holes 11 are arranged on the outer wall of the lower embedded precipitation pipe 3, and underground water can enter the lower embedded precipitation pipe 3 through the water-permeable holes 11; the underground water can be effectively dewatered by placing the water pumping equipment in the lower embedded precipitation pipe 3; and after the dewatering is completed, the blocking cover 6 at the top of the upper embedded precipitation pipe 4 is installed.

[0030] As shown in Figures 4-8 , the construction process of the partial dewatering structure of the foundation pit 1 of the utility model is as follows:

[0031] The first step, as shown in Figure 4 , the water level is observed through the observation well, the partial dewatering depth of the elevator shaft and the sump 2 is determined, the interface height of the device is calculated and determined, the lower embedded precipitation pipe 3 is lowered to the predetermined depth in sections, the water pumping equipment is installed in the lower embedded precipitation pipe 3, and the dewatering is started.

[0032] The second step, as shown in Figure 5 , after the dewatering reaches the corresponding elevation, the earthwork excavation of the sump 2 is carried out, the upper steel pipe 13 is removed after the excavation reaches the slot bottom elevation, and the structural diagram of the upper steel pipe 13 is shown in Figure 9 .

[0033] The third step, as shown in Figure 6 , the upper embedded precipitation pipe 4 with the water stop wing plate 5 is installed.

[0034] The fourth step, as shown in Figure 7 , the concrete pouring construction of the foundation cushion 7 is carried out, and the water stop wing plate 5 is closed in the middle of the foundation cushion 7.

[0035] The fifth step, the waterproof layer 8 is laid to 110mm below the pipe opening, and the secondary pouring groove 10 is reserved for the concrete pouring construction of the primary pouring foundation 9.

[0036] The sixth step, as shown in Figure 8 , after the water pumping is stopped, the water pumping equipment is taken out, the blocking cover 6 is screwed to the top of the upper embedded precipitation pipe 4, and the upper embedded precipitation pipe 4 and the blocking cover 6 exposed outside are completely wrapped with the waterproof layer 8.

[0037] The seventh step, the micro-expansive concrete is used to pour the reserved secondary pouring groove 10.

[0038] The utility model discloses can carry out dewatering operation to foundation pit 1 through lower pre -buried dewatering pipe 3, satisfy elevator shaft, sump 2 local dewatering depth requirement, simple structure, low cost, construction speed is fast, dewatering speed is fast and effectual, simultaneously, through the water stop wing board 5, the plugging cover 6, the waterproof layer 8 and the secondary pouring foundation 11 in the secondary pouring groove 10 can carry out effective sealing to the top of dewatering pipe, prevent groundwater seepage.

Claims

1. A foundation pit partial dewatering structure, characterized by, It includes a water collecting pit, a lower pre-buried dewatering pipe, an upper pre-buried dewatering pipe, a blocking cover, a foundation cushion, a waterproof layer, a primary pouring foundation, a secondary pouring groove and a secondary pouring foundation; the water collecting pit is located at the bottom of the foundation pit, the lower pre-buried dewatering pipe is located at the bottom of the water collecting pit and is inserted into the soil layer below, the upper end of the lower pre-buried dewatering pipe is detachably connected with the upper pre-buried dewatering pipe, the upper pre-buried dewatering pipe penetrates the foundation cushion and the primary pouring foundation above the foundation cushion, the secondary pouring groove is arranged on the primary pouring foundation, the upper end of the upper pre-buried dewatering pipe is located in the secondary pouring groove, the blocking cover is arranged on the top of the upper pre-buried dewatering pipe, the waterproof layer is arranged between the foundation cushion and the primary pouring foundation, and the waterproof layer covers the upper part of the upper pre-buried dewatering pipe and the blocking cover, and the secondary pouring foundation is poured in the secondary pouring groove.

2. The foundation pit partial dewatering structure according to claim 1, characterized in that, A water stop wing plate is arranged on the outer wall of the lower end of the upper pre-buried dewatering pipe, and the water stop wing plate is located in the foundation cushion.

3. The foundation pit local dewatering structure according to claim 1, characterized in that, Uniform water permeable holes are arranged on the outer wall of the lower pre-buried dewatering pipe.

4. The foundation pit local dewatering structure according to claim 1, characterized in that, The lower end of the upper pre-buried dewatering pipe is threadedly connected with the upper end of the lower pre-buried dewatering pipe.

5. The foundation pit local dewatering structure according to claim 1, characterized in that, The blocking cover is threadedly connected with the outer wall of the upper end of the upper pre-buried dewatering pipe, and a water stop rubber ring is arranged in the blocking cover.

6. The foundation pit local dewatering structure according to claim 1, characterized in that, The secondary pouring groove is a cup-shaped groove structure.

7. The foundation pit local dewatering structure according to claim 1, characterized in that, The lower end of the lower pre-buried dewatering pipe is conical.

Images