CN220013741U - Anti-floating blind drain system applied to deep foundation pit - Google Patents

Abstract

The utility model discloses an anti-floating blind ditch drainage system applied to a deep foundation pit, which comprises a basement outer wall, a drainage system and a blind ditch structure, wherein the blind ditch structure comprises a bottom plate blind ditch and an outer wall blind ditch, the bottom plate blind ditch is arranged below a basement bottom plate, the outer wall blind ditch is arranged outside the basement outer wall, the bottom plate blind ditch and the outer wall blind ditch are connected with the drainage system, and the bottom plate blind ditch is arranged below the outer wall blind ditch. According to the utility model, the drainage system of the underground water is formed by mutually communicating the blind ditch of the bottom plate, the blind ditch of the outer wall and the drainage system, the water level of the underground water is controlled to be a certain depth below the bottom plate, a permanent self-flowing blind ditch drainage system is formed, the underground water level is effectively reduced, the construction environment of an underground building and the use environment of an underground structural engineering are optimized, the anti-floating capacity of the underground building is improved, the traditional anti-floating design and water stopping design are avoided, and the effects of shortening the construction period and reducing the construction cost are achieved.

Description

Anti-floating blind drain system applied to deep foundation pit

Technical Field

The utility model relates to the technical field of anti-floating drainage of deep foundation pits, in particular to an anti-floating blind ditch drainage system applied to a deep foundation pit.

Background

The underground building structure is equivalent to a closed box body, and can be subjected to upward water buoyancy under the action of water pressure due to the existence of underground water. In the anti-floating design of underground buildings, the anti-floating design of the whole and the anti-floating design of the local structural members are generally required.

At present, in the anti-floating design of the underground building structure, the adopted design method and measures mainly comprise an anti-floating anchor rod method, an anti-floating pile method and a structure dead weight increasing method. The anti-floating anchor rod is widely used because of the advantages of low cost, convenient construction, reasonable stress and the like. However, no special current standard can be followed for the design, construction and detection of the existing anti-floating anchor, so the design must be based on tests, the selection is performed after theoretical calculation, and the design of the anti-floating anchor is adjusted according to the actual bearing capacity after the corresponding field data is obtained by the test pile. The uplift pile method is an anti-floating design method for resisting the water buoyancy of the underground building by utilizing the uplift bearing capacity of the pile; the anti-pulling pile plays a role in resisting pulling by utilizing pile side resistance, the pulling resistance of the anti-pulling pile is related to pile type, pile diameter, pile length and surrounding geological conditions, and the pulling resistance bearing capacity of the anti-pulling pile is determined by a field pulling resistance static load test; the uplift pile is greatly influenced by the environment and the construction condition in the construction and use processes, and the construction cost is relatively high. The method of increasing the dead weight of the structure is generally an anti-floating method adopted by the fact that the weight of the structure is smaller than the water buoyancy of groundwater to the underground building structure, and the anti-floating capability of the structure is insufficient, namely, the weight of the structure is increased or a counterweight is arranged at the upper part of the structure.

The anti-floating design method mainly increases the bearing capacity of the structural member or increases the weight of the structure to passively resist the water buoyancy of the underground water to the basement structure, the general design parameters need to be subjected to repeated test and calculation, the problems of low construction efficiency, large forming effect deviation, high engineering cost and the like exist, and the construction projects with high requirements on construction period and quality cannot be met, so that anti-floating blind ditches such as CN115928808A and CN214090013U appear, the defect that anti-floating measures need repeated tests is overcome, and the problems of poor forming effect and frequent maintenance exist in practical application. The utility model provides an anti-floating blind drain system applied to a deep foundation pit, which solves the problems.

Disclosure of Invention

The utility model provides an anti-floating blind drain system applied to a deep foundation pit, which forms a permanent self-flowing blind drain system, realizes the drainage of underground water and has good anti-floating effect.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the anti-floating blind ditch drainage system comprises a basement outer wall, a drainage system and a blind ditch structure, wherein the blind ditch structure comprises a bottom plate blind ditch and an outer wall blind ditch, the bottom plate blind ditch is arranged below a basement bottom plate, the outer wall blind ditch is arranged outside the basement outer wall, the bottom plate blind ditch and the outer wall blind ditch are connected with the drainage system, and the bottom plate blind ditch is arranged below the outer wall blind ditch;

the blind ditch of the bottom plate and the blind ditch of the outer wall comprise a reverse filtering layer, an outer filtering layer, a filter material, an inner filtering layer and a blind pipe, wherein the blind pipe, the inner filtering layer, the filter material, the outer filtering layer and the reverse filtering layer are arranged layer by layer from inside to outside;

the outer wall blind drain still includes the drain pipe, the drain pipe is established in the below of blind pipe, all establishes in the inner filter layer, blind pipe and drain pipe all communicate with drainage system.

Further, drainage system includes sump pit, inspection shaft and municipal drainage pipe, the inspection shaft is established in the basement outer wall outside, outer wall french drain passes through inspection shaft and municipal drainage pipe 23 intercommunication, the sump pit is established in the bottom plate below, communicates with the bottom plate french drain, sump pit and municipal drainage pipe and inspection shaft intercommunication.

Further, the filter material is arranged on the periphery of the blind pipe, and the outer filter layer is arranged on the periphery of the filter material.

Further, the water collecting well comprises a well body and a well cover, and the blind pipe and the municipal drain pipe of the blind ditch of the bottom plate are connected to the well body.

Further, a drainage branch pipe is arranged below the blind ditch of the bottom plate and is positioned between the water collecting well and the municipal drainage pipe and between the inspection well and the water collecting well.

Further, an isolation layer and a cushion layer are arranged at the top of the blind ditch of the bottom plate.

Further, the bottom plate blind drain and the outer wall blind drain are mutually perpendicular.

Preferably, the size of the blind drain of the bottom plate is 500×500mm, and the size of the blind drain of the outer wall is 1000×1000mm.

Preferably, the reverse filtering layer is a middle sand reverse filtering layer, the outer filtering layer and the inner filtering layer are geotechnical cloth, the filter material is crushed stone with the particle size of 15-30mm, the isolation layer is an oil felt layer, and the cushion layer is a reinforced concrete layer.

The utility model has the following beneficial effects:

the drainage system is formed by mutually communicating the bottom plate blind ditch, the outer wall blind ditch and the drainage system, the water level of the underground water is controlled to be a certain depth below the bottom plate, a permanent self-flowing blind ditch drainage system is formed, the underground water level is effectively reduced, the construction environment of an underground building and the use environment of an underground structural engineering are optimized, the anti-floating capacity of the underground building is improved, the traditional anti-floating design and water stopping design are avoided, and the effects of shortening the construction period and reducing the construction cost are achieved;

the utility model has the advantages of low construction material cost, convenient construction and reliable drainage effect, does not generate corrosion, siltation and failure of drainage section, collects the discharged groundwater for recycling through the water collecting well and the inspection well, reduces water cost and saves water resources.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic diagram of a blind drain structure of a base plate according to the present utility model;

FIG. 3 is a schematic view of the blind ditch structure of the outer wall of the present utility model;

FIG. 4 is a schematic view of the structure of a water collection well according to the present utility model;

fig. 5 is a schematic view of the manhole structure of the present utility model.

Reference numerals: 1-basement outer wall, 2-drainage system, 21-collecting well, 22-inspection well, 23-municipal drain pipe, 3-bottom plate blind ditch, 31-back filter layer, 32-outer filter layer, 33-filter material, 34-inner filter layer, 35-blind pipe, 36-drain pipe, 4-outer wall blind ditch.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the 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 this patent, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the patent and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and are therefore not to be construed as limiting the patent.

As shown in fig. 1, 2 and 3, an anti-floating blind drain system applied to a deep foundation pit comprises a basement outer wall 1, a drain system 2 and a blind drain structure, wherein the blind drain structure comprises a bottom plate blind drain 3 and an outer wall blind drain 4, the bottom plate blind drain 3 and the outer wall blind drain 4 are arranged in a crisscross manner, underground water in the foundation pit is discharged, the bottom plate blind drain 3 is arranged below a basement bottom plate at intervals, the outer wall blind drain 4 is arranged outside the basement outer wall 1, the bottom plate blind drain 3 and the outer wall blind drain 4 are connected with the drain system 2 to form a communicated drain system, the elevation of the bottom plate blind drain 3 is lower than that of the outer wall blind drain 4, the outer wall blind drain 4 is conveniently drained, and then the underground water is discharged into a municipal pipe network.

As shown in fig. 1, an outer wall blind ditch 4 is communicated with a bottom plate blind ditch 3 through an inspection well 22, underground water is collected by the outer wall blind ditch 4 and then discharged into a municipal pipe network through the inspection well 22, the collected underground water is discharged into a water collecting well 21 by the bottom plate blind ditch 3, the water collecting well 21 is communicated with a municipal water discharge pipe 23, meanwhile, the water collecting well 21 is also communicated with the inspection well 22, the inspection wells 22 at other positions are communicated with the municipal pipe network, and then the water collection is uniformly discharged to the municipal pipe network, so that the underground water level of the bottom plate area is controlled below the ground of the bottom plate, and a permanent self-flowing blind ditch drainage system is formed.

As shown in fig. 2 and 3, the bottom plate blind drain 3 and the outer wall blind drain 4 comprise a reverse filtering layer 31, an outer filtering layer 32, a filtering material 33, an inner filtering layer 34 and a blind pipe 35, wherein the blind pipe 35, the inner filtering layer 34, the filtering material 33, the outer filtering layer 32 and the reverse filtering layer 31 are arranged layer by layer from inside to outside, and the outermost side is backfilled with cohesive soil and backfilled to the ground at the top of a pit; the outer wall blind drain 4 further comprises a drain pipe 36, the drain pipes 36 are arranged below the blind pipes 35 and are arranged in the inner filtering layer 34, and the blind pipes 35 and the drain pipes 36 are communicated with the drainage system 2. The inner filter layer 34 is wrapped up in the periphery of the blind pipe 35 of the bottom plate blind drain 3 and the periphery of the drain pipe 36 and the blind pipe 35 of the outer wall blind drain 4, and is positioned in the middle of the filter material 33, the outer filter layer 32 is wrapped up in the outside of the filter material 33 and is positioned in the middle of the reverse filter layer 31, and four layers of filters are formed for screening out sediment in a layered classification mode, so that the blocking of the blind pipe 35 and the drain pipe 36 is avoided.

Preferably, the blind pipe 35 and the drain pipe 36 are arranged in parallel in pairs.

As shown in fig. 1, 4 and 5, further, the drainage system 2 comprises a water collecting well 21, an inspection well 22 and a municipal drainage pipe 23, wherein the inspection well 22 is arranged at the outer side of the basement outer wall 1 at intervals, the outer wall blind drain 4 is communicated with the municipal drainage pipe 23 through the inspection well 22, the water collecting well 21 is arranged below the bottom plate and communicated with the bottom plate blind drain 3, and the water collecting well 21 is communicated with the municipal drainage pipe 23 and the inspection well 22.

Further, the filter material 33 is disposed at the outer periphery of the blind pipe 35, and the outer filter layer 32 is disposed at the outer periphery of the filter material 33.

Further, the water collection well 21 comprises a well body and a well cover, and the blind pipe 35 of the blind drain 3 of the bottom plate and the municipal drain pipe 23 are connected to the well body.

Further, a drainage branch pipe is arranged below the blind drain 3 of the bottom plate, and is positioned between the water collecting well 21 and the municipal drainage pipe 23 and between the inspection well 22 and the water collecting well 21, and is used for communicating the drainage pipes to form a drainage system.

Preferably, the well wall of the inspection well 22 is provided with a water inlet and a water outlet, the blind pipe 35 and the water outlet 36 of the blind ditch 4 of the outer wall are connected to the water inlet of the inspection well 22, and the water outlet of the inspection well 22 is communicated to the water outlet branch pipe or the municipal water outlet pipe 23.

Preferably, the water collecting well 21 is provided with a water outlet of the blind pipe 35 and a water inlet of the water discharging branch pipe.

Further, the top of the bottom plate blind drain 3 is provided with an isolation layer and a cushion layer, and the isolation layer is arranged to prevent slurry from blocking filter materials during cushion layer construction.

Further, the bottom plate blind drain 3 and the outer wall blind drain 4 are arranged at intervals and are perpendicular to each other.

Preferably, the size of the blind drain 3 of the bottom plate is 500×500mm, and the size of the blind drain 4 of the outer wall is 1000×1000mm.

Preferably, the reverse filtering layer 31 is a middle sand reverse filtering layer, and the middle sand grading requirement should be d15=0.2 mm; the outer filter layer 32 and the inner filter layer 34 are needle-punched geotextile, the puncture strength is not less than 400N, the bursting strength is more than 1.5kN, the tearing strength is more than 400N, the mass per unit area is not less than 300g/m < 2 >, the permeability coefficient is not less than 0.01cm/s, the equivalent pore diameter of the geotextile is 3d15< = 095< = 1.8d85, wherein d15 is the soil mass less than the particle size in the soil and accounts for 15% of the total mass of the soil particles, and d85 is the soil mass less than the particle size in the soil and accounts for 85% of the total mass of the soil particles; the filter material 33 is crushed stone with the grain size of 15-30mm, the total content of mud, clay blocks and organic matters in the filter material is not more than 1%, the tamping degree of the filter material layer, namely the ratio of the tamped thickness to the virtual paving thickness is not more than 0.9, the isolation layer is an oil felt layer, and the cushion layer is a reinforced concrete layer.

Preferably, the blind pipe 35 is a finished plastic blind pipe, the blind pipe 35 is circular and hollow, and the outer diameter is 150mm and 200mm; the void ratio is more than 85 percent, and the single drainage rate is more than 200m3/d under the condition of i=0.2; the compressive strength satisfies a deformation of less than 10% at a pressure of 0.2 MPa.

Preferably, the drain pipe adopts a PE pipe with the diameter of D300 and is connected by adopting an elastic sealing ring.

Preferably, the municipal drain pipe 23 is a D400 diameter cast iron pipe.

Preferably, the inspection well 22 is arranged outside the basement, the interval 50m is arranged at the corner of the drainage channel, the diameter is 1200mm, the shaft bottom elevation is lower than the blind pipe bottom 0.5-1.0m of the outer wall blind ditch 4, the water collecting well is arranged at the water flow converging position of the node of the drainage pipe network, the masonry structure is adopted, the inner diameter of a well is 800mm, the well wall is provided with a water inlet and a drainage outlet, the water inlet is communicated with the blind pipe 35 of the bottom plate blind ditch 3, and the drainage outlet is communicated with the municipal drainage pipe 23.

The construction method of the utility model comprises the following steps: firstly marking and positioning, then cutting blind grooves of a bottom plate according to blind groove positioning lines, leveling the groove bottom and paving a layer of reverse filtering layer 31 after finishing, then paving an outer filtering layer 32 along the edges of the blind grooves and the groove bottom, paving a filtering material 33 and tamping, then paving a blind pipe 7 wrapped with an inner filtering layer 34, then paving the filtering material 33 and tamping, wrapping the filtering material 33 by using the paved outer filtering layer 32, backfilling the reverse filtering layer 31 to the bottom surface of a foundation pit on the outer side, then paving a Fang Pushe isolation layer on the blind groove of the bottom plate, and finally backfilling cohesive soil 16 to the top surface of the foundation pit;

after the construction of the blind ditch of the bottom plate is completed, the construction of the blind ditch 4 of the outer wall is carried out according to the operation, and then the construction of a subsequent building structure is carried out;

before the construction of the reverse filtering layer 31 of the blind ditch of the bottom plate, the drainage branch pipe is buried first, and the reserved interface is communicated with the inspection well for subsequent construction.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (9)

1. The utility model provides an anti-floating blind drain system for deep basal pit, its characterized in that includes basement outer wall (1), drainage system (2) and blind drain structure, the blind drain structure includes bottom plate blind drain (3) and outer wall blind drain (4), bottom plate blind drain (3) set up in the below of basement bottom plate, outer wall blind drain (4) set up in basement outer wall (1) outside, bottom plate blind drain (3) and outer wall blind drain (4) are connected with drainage system (2), bottom plate blind drain (3) are located the below of outer wall blind drain (4);

the bottom plate blind drain (3) and the outer wall blind drain (4) comprise a reverse filtering layer (31), an outer filtering layer (32), a filter material (33), an inner filtering layer (34) and a blind pipe (35), wherein the blind pipe (35), the inner filtering layer (34), the filter material (33), the outer filtering layer (32) and the reverse filtering layer (31) are arranged layer by layer from inside to outside;

the outer wall blind ditch (4) further comprises a drain pipe (36), the drain pipe (36) is arranged below the blind pipe (35) and in the inner filter layer (34), and the blind pipe (35) and the drain pipe (36) are communicated with the drainage system (2).

2. The anti-floating blind drain system applied to a deep foundation pit according to claim 1, wherein the anti-floating blind drain system is characterized in that: drainage system (2) are including sump pit (21), inspection shaft (22) and municipal drainage pipe (23), inspection shaft (22) are established in basement outer wall (1) outside, outer wall french drain (4) are through inspection shaft (22) and municipal drainage pipe (23) intercommunication, sump pit (21) are established in the bottom plate below, with bottom plate french drain (3) intercommunication, sump pit (21) are with municipal drainage pipe (23) and inspection shaft (22) intercommunication.

3. The anti-floating blind drain system applied to a deep foundation pit according to claim 1, wherein the anti-floating blind drain system is characterized in that: the filter material (33) is arranged on the periphery of the blind pipe (35), and the outer filter layer (32) is arranged on the periphery of the filter material (33).

4. The anti-floating blind drain system applied to the deep foundation pit according to claim 2, wherein the anti-floating blind drain system is characterized in that: the water collecting well (21) comprises a well body and a well cover, and a blind pipe (35) of the bottom plate blind drain (3) and the municipal drainage pipe (23) are connected to the well body.

5. The anti-floating blind drain system applied to the deep foundation pit, according to claim 4, is characterized in that: the drainage branch pipes are arranged below the bottom plate blind ditches (3) and are positioned between the water collecting well (21) and the municipal drainage pipe (23) and between the inspection well (22) and the water collecting well (21).

6. The anti-floating blind drain system applied to a deep foundation pit according to claim 1, wherein the anti-floating blind drain system is characterized in that: the top of the bottom plate blind ditch (3) is provided with an isolation layer and a cushion layer.

7. The anti-floating blind drain system applied to a deep foundation pit according to claim 1, wherein the anti-floating blind drain system is characterized in that: the bottom plate blind drain (3) and the outer wall blind drain (4) are mutually perpendicular.

8. The anti-floating blind drain system applied to a deep foundation pit according to claim 1, wherein the anti-floating blind drain system is characterized in that: the size of the bottom plate blind drain (3) is 500mm, and the size of the outer wall blind drain (4) is 1000mm.

9. The anti-floating blind drain system applied to the deep foundation pit, according to claim 6, is characterized in that: the filter material is characterized in that the reverse filtering layer (31) is a middle sand reverse filtering layer, the outer filtering layer (32) and the inner filtering layer (34) are geotechnical cloth, the filter material (33) is crushed stone with the particle size of 15-30mm, the isolating layer is a felt layer, and the cushion layer is a reinforced concrete layer.