CN217231908U - Prevent foundation ditch curtain of sand and soil loss - Google Patents

Abstract

The utility model discloses a prevent foundation ditch curtain of sand and soil loss, including the curtain body, pressure balance pipe and anchor rope, through setting up the pressure balance pipe, set up the slope of pressure balance pipe, the one end tip inserts in the external soil body of curtain, the other end sets up in the foundation ditch space, and the tip highly is higher than the one end that is located the soil body, make the in-process that the inherent drilling of soil body and anchor rope were packed into, inside water pressure and the soil body of taking out can be kept in the pressure balance intraductal, prevent that the soil body and the water of curtain body side from spilling over and losing, improve the stability that the curtain body supported the soil body.

Description

Prevent foundation ditch curtain of sand and soil loss

Technical Field

The application relates to a foundation pit curtain technical field, concretely relates to prevent foundation pit curtain of sand and soil loss.

Background

At present in the middle of the excavation supporting use, under the geological conditions of strong water permeability such as sand bed, often use the excavation supporting system of supporting construction, curtain structure and anchor rope, this excavation supporting system can have following problem when the difference of water level is great inside and outside the foundation ditch:

referring to fig. 1, when the water level inside and outside the foundation pit is different, the water level outside the foundation pit is higher than the water level inside the foundation pit, and if anchor cable construction is performed under the condition, in the middle of the construction process, due to the difference between the water level inside and outside, groundwater in anchor cable drill holes becomes pressure water, and along with the drilling process of a drilling rig, the pressure water flows out from the anchor cable drill holes, and thin soil layers and sand layers on the side walls of the drill holes are taken away, so that anchor cable drilling collapse is caused, anchor cable hole forming is influenced, and anchor cable construction difficulty is caused.

At present, the method for solving the problems in engineering is as follows: and pumping water to the outside of the foundation pit, and eliminating the pressure in the drilled hole when the water level outside the foundation pit is balanced with the water level inside the foundation pit, and then performing anchor cable drilling construction.

The method is effective at present aiming at the engineering problems, but has some disadvantages, and strong precipitation outside the foundation pit is disadvantageous in several points:

the ground surrounding the foundation pit is settled by strong precipitation outside the foundation pit, particularly the positions of buildings or underground pipelines around the foundation pit are increased, the engineering risk is increased, the number of precipitation wells is increased in the strong precipitation process, precipitation machine shifts are increased, and the engineering cost is increased.

SUMMERY OF THE UTILITY MODEL

In view of above-mentioned problem, this application provides a prevent foundation ditch curtain of sand and soil loss to the groundwater that solves among the prior art in the anchor rope drilling becomes to have pressure water, and pressure water can flow out from the anchor rope drilling, takes away the fine soil layer and the sand bed of drilling lateral wall, causes the anchor rope drilling hole that collapses, and then influences the anchor rope pore-forming, causes the problem of anchor rope construction difficulty

In order to achieve the aim, the inventor provides a foundation pit curtain for preventing sand loss, which comprises a curtain body, a pressure balance pipe and an anchor cable;

the curtain body is inserted into the soil body, one side of the curtain body faces the foundation pit, and the other side of the curtain body faces the soil body;

the pressure balance pipe is obliquely arranged, one end of the pressure balance pipe is connected into the curtain body and extends into the soil body on the other side of the curtain body, and the other end of the pressure balance pipe is arranged in the direction of one side of the curtain body towards the foundation pit and is higher than the height of one end of the pressure balance pipe in the soil body;

the anchor cable penetrates through the pressure balance pipe, one end of the anchor cable is located in the soil body, and the other end of the anchor cable is connected to the pressure balance pipe or the curtain body.

As a preferred embodiment of this application, still include water level observation well, water level observation well sets up in the one side of curtain body towards the soil body for hold the internal water of soil, and the tip height that pressure balance pipe is located one side direction of foundation ditch is higher than the height of the internal water of water level observation well. Through setting up water level observation well for the one side internal water memory space of curtain body towards the soil body can be surveyd through water level observation well, and according to the height of the water in the water level observation well, the one end that the pressure balance pipe is located the foundation ditch direction during the adjustment construction sets up the height, makes the intraductal material of pressure balance provide sufficient pressure balance when can laying for drilling and anchor rope, avoids spilling over of hole department soil body and water to run off.

As a preferred embodiment of the application, the height of the end part of the pressure balance pipe in the direction of one side of the foundation pit is 0.5m-1m higher than the height of the water body in the water level observation well. The height of the pressure balance pipe is 0.5 to 1m higher than the height of the water body in water immersion, so that the pressure balance pipe has enough length and height to cope with the pressure change in the soil body under different weathers.

As a preferred embodiment of the application, the pressure balance pipe is a steel pipe. The strength of the pressure balance pipe can be ensured by selecting the steel pipe.

As a preferred embodiment of the present application, the anchor line is fixedly connected to the curtain body or the pressure balance pipe toward one end of the curtain body. The anchor cable is fixedly connected to the curtain body or the pressure balance pipe toward one end of the curtain body, so that the anchor cable can support the curtain body.

As a preferred embodiment of the present application, the pressure balance pipe is disposed in parallel with the anchor cable. Through parallel arrangement of the pressure balance pipe and the anchor cable, in the process of installing the anchor cable into the locking part, the pipe body of the pressure balance pipe is prevented from rubbing the anchor cable or interfering with the anchor cable in the using process, and the service life of the anchor cable is prolonged.

As a preferred embodiment of the present application, the curtain body is arranged around the foundation pit. The curtain body is arranged around the foundation pit, so that the soil body can be stably drilled around the foundation pit structure and the anchor cable can be stably fixed.

As a preferred embodiment of the present application, the bottom of the curtain body is lower than the bottom of the foundation pit. The bottom height of the curtain body is lower than the height of the bottom surface of the foundation pit, so that the curtain body can stably support the soil body structure on the side edge of the foundation pit.

Different from the prior art, the technical scheme has the following advantages: through setting up the pressure balance pipe, set up the slope of pressure balance pipe, in the soil body outside the curtain body was inserted to one end tip, the other end set up in the foundation ditch space, and the tip height is higher than the one end that is located the soil body for the inherent drilling of soil body and the in-process of anchor rope packing into, inside water pressure and the soil body of taking out can be remain in the pressure balance intraductal, prevent that the soil body and the water of curtain body side from spilling over and losing, improve the stability that the curtain body supported the soil body.

The above description of the present invention is only an outline of the present invention, and in order to make the technical solution of the present invention more clearly understood by those skilled in the art, the present invention may be implemented based on the content described in the text and drawings of the present specification, and in order to make the above object, other objects, features, and advantages of the present invention more easily understood, the following description will be made in conjunction with the embodiments of the present application and the drawings.

Drawings

The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of particular embodiments of the present application, as well as others related thereto, and are not to be construed as limiting the application.

In the drawings of the specification:

FIG. 1 is a schematic diagram of a prior art foundation pit curtain;

FIG. 2 is a schematic view of the whole structure of a foundation pit curtain for preventing sand loss according to an embodiment of the present invention;

fig. 3 is a detailed structure diagram of the foundation pit curtain anchor cable for preventing sand loss in the embodiment of the present invention.

The reference numerals referred to in the above figures are explained below:

10. a curtain body;

20. a pressure balance tube;

30. an anchor cable;

40. soil mass;

50. a foundation pit;

60. a body of water;

70. and a water level observation well.

Detailed Description

In order to explain in detail possible application scenarios, technical principles, practical embodiments, and the like of the present application, the following detailed description is given with reference to the accompanying drawings in conjunction with the listed embodiments. The embodiments described herein are merely for more clearly illustrating the technical solutions of the present application, and therefore, the embodiments are only used as examples, and the scope of the present application is not limited thereby.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or related to other embodiments specifically defined. In principle, in the present application, the technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution as long as there is no technical contradiction or conflict.

Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the use of relational terms herein is intended only to describe particular embodiments and is not intended to limit the present application.

In the description of the present application, the term "and/or" is a expression for describing a logical relationship between objects, meaning that three relationships may exist, for example a and/or B, meaning: there are three cases of A, B, and both A and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in a logical relationship of "or".

In this application, terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Without further limitation, in this application, the use of "including," "comprising," "having," or other similar expressions in phrases and expressions of "including," "comprising," or "having," is intended to cover a non-exclusive inclusion, and such expressions do not exclude the presence of additional elements in a process, method, or article that includes the recited elements, such that a process, method, or article that includes a list of elements may include not only those elements but also other elements not expressly listed or inherent to such process, method, or article.

As is understood in the examination of the guidelines, the terms "greater than", "less than", "more than" and the like in this application are to be understood as excluding the number; the expressions "above", "below", "within" and the like are understood to include the present numbers. In addition, in the description of the embodiments of the present application, "a plurality" means two or more (including two), and expressions related to "a plurality" similar thereto are also understood, for example, "a plurality of groups", "a plurality of times", and the like, unless specifically defined otherwise.

In the description of the embodiments of the present application, spatially relative expressions such as "central," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used, and the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the specific embodiments or drawings and are only for convenience of describing the specific embodiments of the present application or for the convenience of the reader, and do not indicate or imply that the device or component in question must have a specific position, a specific orientation, or be constructed or operated in a specific orientation and therefore should not be construed as limiting the embodiments of the present application.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and "disposed" used in the description of the embodiments of the present application are to be construed broadly. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; they may be directly connected or indirectly connected through an intermediate; which may be communication within two elements or an interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains in accordance with specific situations.

Referring to fig. 2 and 3, the present embodiment discloses a foundation pit curtain for preventing sand loss, which includes a curtain body 10, a pressure balance pipe 20 and an anchor cable 30. The number of the curtain bodies 10 is one or more than two, the bottom of a single curtain body 10 is directly inserted into the soil 40 on one side of the foundation pit 50, and when the number of the curtain bodies 10 is more than two, the sides of the curtain bodies 10 are overlapped with each other and inserted into the soil 40 on one side of the foundation pit 50. The curtain body 10 is oriented with one side toward the excavation 50 and the other side toward the soil 40. The pressure balance pipe 20 is obliquely disposed, one end of the pressure balance pipe 20 is inserted into the curtain body 10 and extends into the soil 40 on the other side of the curtain body 10 (in some preferred embodiments, the end of the pressure balance pipe may extend into the soil on the other side of the curtain body for a certain length, for example, more than 0.1m, specifically, 0.1m, 0.2m, 0.5m, 1m, the longer the length of the pressure balance pipe extending into the soil is, the soil near the curtain body is not easily brought away from the side of the curtain body by the flow and the gush of the water 60, so that the curtain body can stably support the soil structure to avoid the problem of the soil on the contact surface being brought out by the water to cause loose curtain, the other end of the pressure balance pipe 20 is disposed in the direction of the curtain body 10 toward the one side of the foundation pit 50, and the end of the pressure balance pipe 20 toward the foundation pit 50 is disposed at a height higher than the end of the pressure balance pipe 20 within the soil 40 (specifically, may be disposed in the space of the foundation pit 50, and in other embodiments, if the height of the soil body is higher than the curtain body, the end of the pressure balance pipe may be disposed above the space of the foundation pit to realize the adaptation to the water pressure). The anchor cable 30 passes through the pressure balance pipe 20, one end of the anchor cable is positioned in the soil body 40, and the other end of the anchor cable is connected to the pressure balance pipe 20 or the curtain body 10.

According to the structure, in the concrete assembling process of the foundation pit curtain for preventing sand loss, the curtain body is driven into the side edge of the foundation pit to be excavated, excavation of the foundation pit is carried out on one surface of the curtain body, and the other surface of the curtain body supports the soil body. After the excavation of the foundation pit is completed, the end part of the pressure balance pipe is inserted into a preset assembly opening on the curtain body, or an opening is excavated on the curtain body, the pressure balance pipe is installed, the pressure balance pipe is obliquely arranged and fixed on the curtain body by adopting welding, buckling connection and other modes, the stability of the pressure balance pipe in the assembly process of the anchor cable is ensured, and after the pressure balance pipe is assembled, the displacement of a water body and a soil body flowing in the soil body cannot influence the assembly angle of the pressure balance pipe. After the installation of accomplishing pressure balance pipe, pass through drilling equipment along pressure balance pipe's direction, to opening in the soil body and establish the anchor rope pilot hole, at the drilling in-process, the barrel that the pressurized was gushed is piled up in pressure balance pipe, avoids it to lack storage space, leads to overflowing the problem. One end of the anchor cable is provided with a positioning structure, one end of the anchor cable is arranged in the anchor cable assembling hole for fixing, and the other end of the anchor cable is assembled on the curtain body. And after the fixation is finished, performing construction work such as subsequent excavation of the foundation pit.

Specifically, the assembly positioning structure at one end of the anchor cable is a pressure dispersion type anchor cable, and the tail ends of unbonded steel stranded wires with different lengths are sleeved with a bearing body and an extrusion sleeve. After an anchoring section (namely an anchor cable assembly hole drilled by equipment in a soil body) is grouted (namely cement mortar) and consolidated, the anchor cable corresponding to the bearing bodies is tensioned by a certain load, and the plurality of bearing bodies arranged at different depth positions transmit compressive stress to the reinforced body through slurry. In this way, a distributed anchoring force is provided to the reinforced body over the entire anchoring section. Compared with the common tension anchor and pressure anchor, the anchor range of the pressure dispersion type anchor cable and the provided anchor force are obviously increased, the application range of the rock stratum is further expanded, the hole expanding work in the broken rock body is reduced, the excavation slope brushing of the broken section can be reduced to the maximum extent, and the anchor has the advantages of simplified construction procedures and good anti-seismic performance.

In other embodiments, the anchor cable is located in a fixed area in the soil body, or a variable structure with a plurality of annularly arranged deformation plates and an independently arranged extrusion part is adopted, when the anchor cable is fixed in the soil body, the extrusion part is controlled by a rope or a steel bar, the extrusion part connected with the rope or the steel bar extends into the space between the plurality of deformation plates, so that the deformation plates deform towards the outer side direction of the annular structure and contact the hole wall in the soil body, and the fixation of the anchor cable to the soil body is realized.

Referring to fig. 2 and fig. 3, the waterproof curtain includes a waterproof curtain body 10, a waterproof curtain body 70, and a waterproof curtain body 70, wherein the waterproof curtain body 70 is disposed on a side of the waterproof curtain body 10 facing the soil 40 and is used for accommodating the water 60 in the soil 40, and the height of the end of the waterproof curtain body 20 in the direction of the side of the foundation pit 50 is higher than the height of the water in the waterproof curtain body 70. Through setting up water level observation well for the one side internal water memory space of curtain body towards the soil body can be surveyd through water level observation well, and according to the height of the water in the water level observation well, the one end that the pressure balance pipe is located the foundation ditch direction during the adjustment construction sets up the height, makes the intraductal material of pressure balance provide sufficient pressure balance when can laying for drilling and anchor rope, avoids spilling over of hole department soil body and water to run off.

Referring to fig. 2 and 3, the height of the end of the pressure balance pipe 20 in one side direction of the foundation pit is 0.5m-1m higher than the height of the water body in the water level observation well 70. The height of the pressure balance pipe is 0.5 to 1m higher than the height of the water body in water immersion, so that the pressure balance pipe has enough length and height to cope with the pressure change in the soil body under different weathers.

Referring to fig. 2 and 3, the pressure balance pipe 20 is a steel pipe. The strength of the pressure balance pipe can be ensured by selecting the steel pipe.

Referring to fig. 2 and 3, the anchor cable 30 is fixedly connected to the curtain body 10 or the pressure balance pipe 20 toward one end of the curtain body 10. (specifically, the anchor cable may be supported by the curtain body by fixedly attaching the anchor cable to the curtain body or the pressure balance tube at a position facing an end of the curtain body) by cutting the pressure balance tube after the assembly is completed so that the end of the anchor cable is fixed to the curtain body by welding, bolting or tying, or by directly attaching the anchor cable to the pressure balance tube).

Referring to fig. 2 and 3, the pressure balance tube 20 is disposed parallel to the anchor cable 30. Through parallel arrangement of the pressure balance pipe and the anchor cable, in the process of installing the anchor cable into the locking part, the pipe body of the pressure balance pipe is prevented from rubbing the anchor cable or interfering with the anchor cable in the using process, and the service life of the anchor cable is prolonged.

In certain preferred embodiments, the curtain body 10 is positioned around a foundation pit. The curtain body is arranged around the foundation pit, so that the soil body can be stably drilled around the foundation pit structure and the anchor cable can be stably fixed.

Referring to fig. 2 and 3, the bottom of the curtain body 10 is lower than the bottom of the foundation pit 50. The bottom height of the curtain body is lower than the height of the bottom surface of the foundation pit, so that the curtain body can stably support the soil body structure on the side edge of the foundation pit.

In the above embodiment, the curtain body may adopt a foundation pit supporting and protecting plate, specifically, a metal plate with a planar structure, or a wave plate.

Finally, it should be noted that, although the above embodiments have been described in the text and drawings of the present application, the scope of the patent protection of the present application is not limited thereby. All technical solutions which are generated by replacing or modifying the equivalent structure or the equivalent flow according to the contents described in the text and the drawings of the present application, and which are directly or indirectly implemented in other related technical fields, are included in the scope of protection of the present application.

Claims (8)

1. A foundation pit curtain for preventing sand loss is characterized by comprising a curtain body, a pressure balance pipe and an anchor cable;

the curtain body is inserted into the soil body, one side of the curtain body faces the foundation pit, and the other side of the curtain body faces the soil body;

the pressure balance pipe is obliquely arranged, one end of the pressure balance pipe is connected into the curtain body and extends into the soil body on the other side of the curtain body, and the other end of the pressure balance pipe is arranged in the direction of one side, facing the foundation pit, of the curtain body and is higher than the height of one end, located in the soil body, of the pressure balance pipe;

the anchor cable penetrates through the pressure balance pipe, one end of the anchor cable is located in the soil body, and the other end of the anchor cable is connected to the pressure balance pipe or the curtain body.

2. The foundation pit curtain for preventing sand loss according to claim 1, further comprising a water level observation well, wherein the water level observation well is arranged on one side of the curtain body facing the soil body and is used for accommodating a water body in the soil body, and the end of the pressure balance pipe in the direction of one side of the foundation pit is higher than the water body in the water level observation well.

3. The curtain for foundation pit with sand loss prevention according to claim 2, wherein the height of the end of the pressure balance pipe in the direction of one surface of the foundation pit is 0.5m-1m higher than the height of the water in the water level observation well.

4. The curtain of foundation pit for preventing sand loss according to claim 1, wherein the pressure balance pipe is steel pipe.

5. The curtain for foundation pit for preventing sand loss of claim 1, wherein the anchor cable is fixedly connected to the curtain body or the pressure balance pipe at an end of the anchor cable facing the curtain body.

6. The curtain of foundation pits for preventing sand loss according to claim 1, wherein the pressure balance pipe is disposed in parallel with the anchor line.

7. The curtain for a foundation pit for preventing sand loss as claimed in claim 1, wherein said curtain body is disposed around the foundation pit.

8. The curtain for a foundation pit for preventing sand loss as claimed in claim 1, wherein the bottom of the curtain body is lower than the bottom of the foundation pit.

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