CN209741884U

CN209741884U - foundation ditch slope buried pipe in advance cuts and oozes structure

Info

Publication number: CN209741884U
Application number: CN201920244488.0U
Authority: CN
Inventors: 齐善忠; 付春梅; 王娟玲
Original assignee: Yellow River Conservancy Technical Institute
Current assignee: Yellow River Conservancy Technical Institute
Priority date: 2019-02-27
Filing date: 2019-02-27
Publication date: 2019-12-06
Anticipated expiration: 2029-02-27

Abstract

The utility model discloses a foundation ditch side slope pre-buried pipe cuts oozes structure, foundation ditch side slope lower part is provided with a plurality of pre-buried pipe slot, the infiltration pipe that a plurality of sections connected gradually has been laid to pre-buried pipe slot bottom, the infiltration pipe wraps up in proper order outward has filter cloth and filter material, all communicate on every section infiltration pipe has the stand-off, the stand-off upper end upwards extends and stretches out the side slope domatic, the upper end that is located the stand-off of same row is connected with a house steward that draws water, the stand-off that draws water upwards extends along the side slope and is connected with the vacuum pump, the soil body has still been filled in the pre-buried. The utility model discloses the pipe is carried out in advance to layering, segmentation, and the foundation ditch side slope of adaptable different degree of depth like this also is applicable to the sand drift layer of different positions, cuts and oozes the in-process and need not form the precipitation funnel, can cut the level to the water source that permeates into for the advantage is more obvious when the water barrier is higher need the precipitation aquifer than thin, effectively prevents to produce the sand drift phenomenon among the foundation ditch excavation process, has avoided phenomenons such as ground structures deformation, fracture, has reduced the engineering cost.

Description

Foundation ditch slope buried pipe in advance cuts and oozes structure

Technical Field

The invention belongs to the technical field of foundation pit dewatering, and particularly relates to a seepage intercepting structure for a foundation pit slope embedded pipe.

Background

At present, along with the development of economy, the requirement on the stability and reliability of a foundation pit supporting structure is higher and higher due to the increase of the underground excavation depth, and factors influencing the stability of a foundation pit side slope are many, such as the excavation depth of the foundation pit, the soil quality of a side wall, the surrounding environment, the distribution of underground water, the supporting type and the like, wherein the influence of the underground water on the stability of the foundation pit side slope is particularly prominent. In the prior engineering case, when the excavation depth of a foundation pit exceeds the underground water level and the underground water permeates into the pit, the foundation pit accidents caused by the fact that corresponding measures are not taken timely for treatment account for the majority.

In the process of excavation of a foundation pit, if underground water is encountered, excavation is generally carried out after the underground water level is lowered. When the foundation pit is not large and the underground water level is not deep, light well point dewatering is generally adopted; when the foundation pit is large and the underground water level needs to be lowered deeply, a pipe well is generally adopted for lowering water, and waterproof curtains are arranged around the foundation pit by adopting cement soil mixing piles and the like; when the area of the foundation pit is large and the underground water level precipitation is not too deep, light well points can be arranged on the periphery of the foundation pit, and the underground water level is reduced by adopting a mixed pipe well in the foundation pit.

When the light well points are adopted to reduce the underground water level or only the light well points are arranged at the periphery of the foundation pit, if the hole forming construction of the well points meets drift sand, the water and soil loss of the side slope is usually caused, the slope top of the foundation pit deforms too much, and the risk of cracking and damaging the peripheral structures is increased. In addition, when a thin aquifer is arranged at the upper part of the waterproof layer and needs to be dewatered, the light well point is easily inserted into the waterproof layer or below the waterproof layer, so that the dewatering cannot form a funnel, and the dewatering effect cannot be achieved or the dewatering is ineffective. When the pipe well is adopted to reduce the underground water level, the cement soil mixing piles are generally arranged around the foundation pit for waterproof curtain in order to reduce the influence on the surrounding environment, and further the engineering cost is increased.

Disclosure of Invention

Based on the defects of the prior art, the invention aims to provide the foundation pit slope embedded pipe seepage intercepting structure, which reduces the engineering cost and the deformation of the foundation pit slope top.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a foundation ditch side slope pre-buried pipe cuts oozing structure, foundation ditch side slope lower part are provided with a plurality of pre-buried pipe slot, and the infiltration pipe that a plurality of sections connected gradually has been laid to pre-buried pipe slot bottom, and the infiltration outside of tubes wraps up in proper order has filter cloth and filter material, all communicates on every section of infiltration pipe to have the stand-off, the upper end of stand-off upwards extends and stretches out the side slope domatic, and the upper end that is located the stand-off of same row is connected with a house steward that draws water, the house steward upwards extends along the side slope, and the upper end of house steward that draws water is connected with the vacuum pump, and the soil body has still been filled outside.

Preferably, the width of the embedded pipe groove is 0.2-0.4 m, and the depth of the embedded pipe groove is 0.4-0.8 m.

preferably, the diameter of the permeation tube is 30-50 millimeters, the length of each section of the permeation tube is 15-20 meters, a plurality of water seepage holes are uniformly arranged on the circumferential wall of the permeation tube at intervals, the diameter of each water seepage hole is 10-15 millimeters, and the distance between every two adjacent water seepage holes is 80-150 millimeters.

Further, the penetration pipe is one of a plastic pipe, a steel pipe and a galvanized pipe.

Preferably, the diameter of the outlet pipe is 30-50 mm, and the upper end of the outlet pipe is 0.2-0.5 m higher than the surface of the foundation pit slope.

Further, the outlet pipe is one of a plastic pipe, a steel pipe and a galvanized pipe.

Preferably, the filter material adopts the millstone or gravel with the particle size of 2-15 millimeters, and the thickness of the filter material wrapping the permeation tube is not less than 100 millimeters.

Preferably, the diameter of the pumping main pipe is 40-80 mm.

The invention provides a foundation pit side slope embedded pipe seepage interception structure, wherein a seepage interception permeation pipe is embedded in advance on a slope body of a foundation pit side slope, and when groundwater permeates into the foundation pit, the seepage interception permeation pipe can directly pump away permeated water through a vacuum pump, so that the aims of intercepting seepage and reducing the water level in the foundation pit are fulfilled.

The foundation pit slope embedded pipe seepage interception structure can replace the distribution of common light well points along the periphery of a foundation pit, and avoids the phenomenon that the common light well points are deformed due to flowing sand or a dewatering funnel is not formed during hole forming construction, so that the dewatering effect is poor; the waterproof curtain can also replace a pipe well arranged at the periphery of the foundation pit, and a waterproof curtain does not need to be arranged, so that the construction cost is reduced.

The invention has simple structure, can be constructed in a layered and sectional way, is convenient and safe, can effectively reduce the deformation of the foundation pit and reduce the engineering cost, and has wide practicability.

Drawings

FIG. 1 is a schematic cross-sectional view of a pre-buried pipe seepage intercepting structure of a foundation pit slope according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

Fig. 3 is a front view of fig. 2.

Detailed Description

As shown in fig. 1 to 3, in a foundation pit side slope buried pipe seepage intercepting structure, 3 buried pipe grooves 4 are uniformly arranged at intervals at the lower part of a foundation pit side slope 8, and the buried pipe groove 4 at the lowest part is positioned at the bottom of the side slope 8; a plurality of sections of permeation tubes 1 connected in sequence are laid at the bottom of a pre-buried tube groove 4, filter cloth and filter materials 2 are wrapped outside the permeation tubes 1 in sequence, an extraction tube 5 is communicated with each section of permeation tube 1, the upper end of the extraction tube 5 extends upwards and extends out of a slope 8, the upper end of the extraction tube 5 located on the same column is connected with a water pumping header pipe 6, the water pumping header pipe 6 extends upwards along the slope 8, the upper end of the water pumping header pipe 6 is connected with a vacuum pump 7, the vacuum pump 7 is located on the ground naturally, and an inviscid soil body 3 is filled in the pre-buried tube groove 4 except the laid permeation tubes 1 and the extraction tubes 5.

in order to ensure the effects of seepage interception and water pumping, the diameter of each permeation tube 1 is 30-50 mm, the length of each section of the permeation tube 1 is 15-20 m, a plurality of seepage holes (which can be used for making flower holes on a non-porous tube wall by imitating a seepage part of a common light well point) are uniformly arranged on the circumferential wall of each permeation tube 1 at intervals, the diameter of each seepage hole is 10-15 mm, and the distance between every two adjacent seepage holes is 80-150 mm; the diameter of the eduction tube 5 is 30-50 mm, and the permeation tube 1 and the eduction tube 5 can be made of the same material (plastic tube or steel tube or galvanized tube). Filter material 2 adopts the particle size to be 2~15 mm's beige stone or gravel, filter material 2 buries the thickness of infiltration pipe 1 and is not less than 100 mm. The diameter of the water pumping main pipe 6 is 40-80 mm. The specific dimensions of the permeation tube 1, the outlet tube 5, the filter material 2 and the water pumping main pipe 6 can be selected within the ranges given above according to the actual engineering conditions.

The construction method of the foundation pit slope pre-buried pipe seepage intercepting structure comprises the following steps:

(1) Wrapping the permeation tube 1 with filter cloth, and then fastening with lead wires; when the filter cloth is wrapped, a connector connected with the eduction tubes 5 is reserved in the middle of the permeation tube 1 (the distance between the eduction tubes 5 positioned on the same path is 15-20 m because the length of each section of the permeation tube 1 is 15-20 m);

(2) Adopting machinery to excavate a foundation pit, stopping the machinery excavation when the foundation pit approaches the underground water level, and adopting manual excavation to dig the pre-buried pipe groove 4 on the foundation pit side slope 8, wherein the width of the pre-buried pipe groove 4 is 0.2-0.4 m and the depth is 0.4-0.8 m according to the condition of the side slope 8; after the pre-buried pipe groove 4 is dug, the permeation pipe 1 wrapped with the filter cloth is placed in the groove, the permeation pipe 1 is connected with the extraction pipe 5, then the filter material 2 is buried outside the filter cloth, the pre-buried pipe groove 4 is backfilled with the non-adhesive soil body 3 until the filter material is filled, and the upper end of the extraction pipe 5 is 0.2-0.5 m higher than the surface of the foundation pit side slope 8;

(3) The upper end of the outlet pipe 5 is connected with a pumping main pipe 6, and the upper end of the pumping main pipe 6 is connected with a vacuum pump 7.

When the foundation pit is not deeply excavated, only one pre-buried pipe groove 4 is excavated, and a permeation tube 1 and an eduction tube 5 are arranged; when the foundation pit needs to be dug to be deeper below the underground water level, one seepage intercepting structure can not meet the seepage intercepting requirement certainly, a plurality of pre-buried pipe grooves 4 need to be dug, and a permeation pipe 1 and an eduction pipe 5 are correspondingly arranged. When a plurality of pre-buried pipe grooves 4 are excavated along the side slope 8, the bottom of the previous pre-buried pipe groove 4 and the top of the next pre-buried pipe groove 4 are overlapped at a certain height (namely, the upper end of the next pre-buried pipe groove 4 is higher than the bottom of the previous pre-buried pipe groove 4), and the pre-buried pipe groove 4 at the lowest part needs to be excavated downwards from the bottom surface of the foundation pit to cut off water permeating from the bottom of the foundation pit.

Because the permeability of the inviscid soil body 3 in the embedded pipe groove 4 is strong, when underground water outside the foundation pit permeates into the embedded pipe groove 4, the permeated underground water can be discharged by the vacuum pump 7 through the permeation pipe 1, the eduction pipe 5 and the pumping header 6, thereby achieving the purpose of intercepting the permeation.

The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the present invention as claimed.

Claims

1. The utility model provides a structure is oozed to foundation ditch slope pre-buried pipe section which characterized in that: foundation ditch side slope lower part is provided with a plurality of pre-buried pipe slots, and a plurality of sections of the permeability tube that connects gradually have been laid to pre-buried pipe slot bottom, and the permeability tube parcel has filter cloth and filter material in proper order outward, all communicates on every section permeability tube to have the stand-off, the upper end of stand-off upwards extends and stretches out the side slope domatic, and the upper end that is located the stand-off is connected with a total water pipe, the total water pipe upwards extends along the side slope, and the upper end of total water pipe is connected with the vacuum pump, and the pre-buried pipe slot interior except that the permeability tube of laying and the stand-off outside of tubes has still been.

2. The foundation pit slope buried pipe seepage intercepting structure of claim 1, wherein: the width of the embedded pipe groove is 0.2-0.4 m, and the depth of the embedded pipe groove is 0.4-0.8 m.

3. The foundation pit slope buried pipe seepage intercepting structure of claim 1, wherein: the diameter of infiltration pipe is 30~50 millimeters, and the length of every section infiltration pipe is 15~20 meters, and even interval is equipped with a plurality of infiltration holes on the circumference wall of infiltration pipe, the diameter in infiltration hole is 10~15 millimeters, and the interval between two adjacent infiltration holes is 80~150 millimeters.

4. The foundation pit slope buried pipe seepage intercepting structure of claim 3, wherein: the penetration pipe is one of a plastic pipe, a steel pipe and a galvanized pipe.

5. the foundation pit slope buried pipe seepage intercepting structure of claim 1, wherein: the diameter of the outlet pipe is 30-50 millimeters, and the upper end of the outlet pipe is 0.2-0.5 meter higher than the surface of the foundation pit slope.

6. The foundation pit slope buried pipe seepage intercepting structure of claim 5, wherein: the eduction tube adopts one of a plastic tube, a steel tube and a galvanized tube.

7. The foundation pit slope buried pipe seepage intercepting structure of claim 1, wherein: the filter material adopts the beige or gravel that the particle size is 2~15 millimeters, the thickness of filter material parcel infiltration pipe is not less than 100 millimeters.

8. The foundation pit slope buried pipe seepage intercepting structure of claim 1, wherein: the diameter of the water pumping main pipe is 40-80 mm.