CN219690568U - Water seepage prevention structure for bottom plate of deep foundation pit - Google Patents

Abstract

The utility model provides a deep foundation pit bottom plate water seepage prevention structure, which comprises a plurality of mutually communicated blind ditches and dewatering wells, wherein the blind ditches are arranged on a foundation pit bottom plate, each blind ditch comprises a plurality of mutually communicated grooves, blind pipes embedded in the grooves and a gravel layer filled in the grooves, the blind pipes are arranged in the middle of the gravel layer, and the blind pipes in the grooves are mutually communicated and lead to the dewatering wells; geotechnical cloth is arranged on the top surface of the crushed stone layer. According to the utility model, grooves and water collecting wells are arranged at the periphery of the bottom and the excavation surface of the foundation pit, blind pipes are buried through broken stones, underground water permeated through a slope body is guided into the water collecting well at the bottom of the foundation pit by the blind ditches, and then the underground water is discharged out of the foundation pit by a sewage pump; the problems of water seepage, water burst, collapse and the like in the foundation pit excavation construction are prevented, so that the safety of the foundation pit construction and surrounding building (construction) is affected.

Description

Water seepage prevention structure for bottom plate of deep foundation pit

Technical Field

The utility model relates to the field of foundation pit construction, in particular to a deep foundation pit bottom plate water seepage prevention structure.

Background

When the foundation pit is constructed by adopting an open cut method, partial ground water in the field section is confined water, medium and slight weathered rock aquifers can be encountered in the construction process, the foundation pit substrate is positioned in the rock stratum, and the problem of sudden gushing of confined water of the bedrock exists; moreover, the excavation work and deep well dewatering are synchronously carried out, the daily water yield of the deep well around the excavation part is obviously reduced, the gravity action of water enables the crevice water to flow to the excavation surface, the excavation operation is affected, when the foundation pit is excavated to the bottom of the foundation pit, the crevice water and the rainwater of other non-excavated side wall rock sand layers can flow to the foundation pit, the water seepage is serious in the foundation pit, the foundation pit construction is affected, and the effective water stop is carried out in response to the excavation range and the periphery of the foundation pit.

Especially, aiming at the conditions that sand layers are widely distributed in the foundation pit range, the sand layers are distributed in a layered mode, the thickness is large, and the water quantity is rich, and because the sand layers are good in water-rich property, medium-strong in water permeability and large in water quantity in the construction process, foundation pit groundwater control is required to be paid attention to in the construction process, emergency and protection measures of local sudden large water and sand flowing in the excavation process are required to be made, and water flowing and collapse in the foundation pit excavation construction are prevented so as to influence the safety of the foundation pit and surrounding building (structure).

Disclosure of Invention

Aiming at the problem of larger water seepage amount in the existing foundation pit excavation, the utility model provides the deep foundation pit bottom plate water seepage prevention structure, which guides the groundwater permeated by the slope body into a water collecting well at the bottom of the foundation pit, and then discharges the groundwater into the outside of the foundation pit by a sewage pump, so as to prevent the problems of water seepage, water burst and the like in the foundation pit excavation construction.

In order to achieve the technical aim, the utility model provides a water seepage prevention structure of a deep foundation pit bottom plate, which comprises a plurality of mutually communicated blind ditches and precipitation wells, wherein the blind ditches are arranged on the foundation pit bottom plate, each blind ditch comprises a plurality of mutually communicated grooves, blind pipes embedded in the grooves and a gravel layer filled in the grooves, the blind pipes are arranged in the middle of the gravel layer, and the blind pipes in the grooves are mutually communicated and lead to the precipitation wells; geotechnical cloth is arranged on the top surface of the crushed stone layer.

The utility model has the preferable technical scheme that: the groove comprises an annular groove dug along the edge of the foundation pit bottom plate, and a plurality of vertical and horizontal grooves which are distributed in the annular groove and are communicated with the annular groove, wherein at least two dewatering wells are symmetrically distributed on the horizontal middle branching line of the foundation pit bottom plate, the dewatering wells are positioned in the groove, the well heads of the dewatering wells are arranged at the bottom of the groove, and a sewage pump is arranged in the dewatering wells; and a gravel layer and a blind pipe are not arranged in the groove at the wellhead part of the dewatering well.

The utility model has the preferable technical scheme that: the depth of the groove is 0.4-0.6 m.

The utility model has the preferable technical scheme that: the crushed stone layer is filled to the equal-height position of the foundation pit bottom plate by crushed stone with the diameter of 30-50 mm.

The utility model has the preferable technical scheme that: the blind pipe is a permeable pipe provided with a plurality of permeable holes, and a synthetic resin permeable pipe or a plastic blind pipe is adopted.

According to the utility model, grooves and water collecting wells are arranged at the periphery of the bottom and the excavation surface of the foundation pit, blind pipes are buried through broken stones, underground water permeated through a slope body is guided into the water collecting well at the bottom of the foundation pit by the blind ditches, and then the underground water is discharged out of the foundation pit by a sewage pump; the problems of water seepage, water burst, collapse and the like in the foundation pit excavation construction are prevented, so that the safety of the foundation pit construction and surrounding building (construction) is affected.

Drawings

FIG. 1 is a schematic plan view of the present utility model;

FIG. 2 is a cross-sectional view of the blind drain of the present utility model;

FIG. 3 is a cross-sectional view of a dewatering well location according to the present utility model.

In the figure: 1-blind ditch, 100-groove, 101-blind pipe, 102-gravel layer, 2-dewatering well, 3-foundation pit bottom plate, 4-sewage pump and 5-geotechnical cloth.

Detailed Description

The utility model is further described below with reference to the drawings and examples. Figures 1 to 3 are drawings of embodiments, drawn in a simplified manner, for the purpose of clearly and concisely illustrating embodiments of the present utility model. The following technical solutions presented in the drawings are specific to embodiments of the present utility model and are not intended to limit the scope of the claimed utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the inventive product is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present utility model.

The embodiment provides a deep foundation pit bottom plate water seepage prevention structure, as shown in fig. 1 to 2, the water seepage prevention structure comprises a plurality of mutually communicated blind ditches 1 and precipitation wells 2 communicated with the blind ditches, wherein the blind ditches 1 comprise a plurality of mutually communicated grooves 100 formed in the foundation pit bottom plate, blind pipes 101 buried in the grooves 100 and gravel layers 102 filled in the grooves, the depth of the grooves 100 is 0.4-0.6 m, the water seepage prevention structure comprises an annular groove dug along the edge of the foundation pit bottom plate 3, a plurality of vertical and transverse grooves which are distributed in the annular groove and are communicated with the annular groove, the precipitation wells 2 are symmetrically distributed on the transverse middle branching lines of the foundation pit bottom plate 3, the precipitation wells 2 are positioned in the grooves 100, the wellheads of the precipitation wells are positioned at the bottoms of the grooves 100, and a sewage pump is arranged in the precipitation wells 2; the groove 100 at the wellhead part of the dewatering well 2 is not provided with the gravel layer 102 and the blind pipe 101. The blind pipe 101 is a permeable pipe provided with a plurality of permeable holes, a synthetic resin permeable pipe or a plastic blind pipe is adopted, the blind pipe 101 is arranged in the middle of the gravel layer 102, and the blind pipes 101 in the grooves 100 are mutually communicated and led to the dewatering well 2. The crushed stone layer 102 is filled to the equal height position of the foundation pit bottom plate 3 by crushed stone with the diameter of 30-50 mm, and geotechnical cloth 5 is distributed on the top surface of the crushed stone layer 102.

The construction process of the utility model is as follows: firstly, measuring and lofting is carried out on a foundation pit bottom plate 3 to determine the position of the groove 100, a measurer carries out construction measurement and lofting, and the excavation boundary and depth of the groove 100 are determined on the ground; then, excavating the groove 100, after the excavation is completed, arranging two dewatering wells 2 at the intersection position of the groove 100, excavating the dewatering wells 2 from the bottom surface of the groove 100, arranging a sewage pump 4 in the dewatering wells 2, and leading a control line of the sewage pump 4 out of the groove 100; then, paving a part of broken stone with the diameter of 30-50 mm in the groove 100 as a cushion layer, arranging a blind pipe 101, fully burying the blind pipe 101 through the broken stone, backfilling the broken stone to the position of the foundation pit bottom plate 3 at the same level, and finally paving geotechnical cloth 5 on the top surface of the broken stone cushion layer, and fully covering the blind ditch through the geotechnical cloth 5; note that the blind pipe 101 and the broken stone are not arranged in the groove 100 of the dewatering well 2 during the backfilling of broken stone and the arrangement of the blind pipe 101.

According to the utility model, underground water permeated by the slope body is guided into a water collecting well at the bottom of the foundation pit by using a blind ditch, and then is discharged out of the foundation pit by using a sewage pump; the problems of water seepage, water burst, collapse and the like in the foundation pit excavation construction are prevented, so that the safety of the foundation pit construction and surrounding building (construction) is affected.

The foregoing description is of one embodiment of the utility model and is thus not to be taken as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.

Claims (5)

1. The utility model provides a deep basal pit bottom plate infiltration prevention structure which characterized in that: the anti-seepage structure comprises a plurality of mutually communicated blind ditches (1) arranged on a foundation pit bottom plate (3) and a dewatering well (2) communicated with the blind ditches, wherein the blind ditches (1) comprise a plurality of mutually communicated grooves (100) formed in the foundation pit bottom plate, blind pipes (101) buried in the grooves (100) and a gravel layer (102) filled in the grooves, the blind pipes (101) are arranged in the middle of the gravel layer (102), and the blind pipes (101) in the grooves (100) are mutually communicated and lead to the dewatering well (2); geotechnical cloth (5) is arranged on the top surface of the crushed stone layer (102).

2. The deep foundation pit bottom plate water seepage prevention structure according to claim 1, wherein: the groove (100) comprises an annular groove dug along the edge of the foundation pit bottom plate (3), and a plurality of vertical and horizontal grooves which are distributed in the annular groove and are communicated with the annular groove, two dewatering wells (2) are symmetrically distributed on the horizontal middle branching line of the foundation pit bottom plate (3), the dewatering wells (2) are positioned in the groove (100), the well heads of the dewatering wells are arranged at the bottom of the groove (100), and a sewage pump (4) is arranged in the dewatering wells (2); the groove (100) at the wellhead part of the dewatering well (2) is not provided with the gravel layer (102) and the blind pipe (101).

3. The deep foundation pit floor water seepage prevention structure according to claim 1 or 2, wherein: the depth of the groove (100) is 0.4-0.6 m.

4. The deep foundation pit floor water seepage prevention structure according to claim 1 or 2, wherein: the crushed stone layer (102) is filled to the equal-height position of the foundation pit bottom plate (3) by crushed stones with the diameter of 30-50 mm.

5. The deep foundation pit floor water seepage prevention structure according to claim 1 or 2, wherein: the blind pipe (101) is a permeable pipe provided with a plurality of permeable holes, and is a synthetic resin permeable pipe or a plastic blind pipe.