CN217378963U

CN217378963U - Pressure reducing pipe device for underground structure construction

Info

Publication number: CN217378963U
Application number: CN202220004111.XU
Authority: CN
Inventors: 李聪; 廖正根; 屈天葵; 马加志; 裴国强; 许昆
Original assignee: Cccc Nanjing Construction Co ltd
Current assignee: Cccc Nanjing Construction Co ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-09-06
Anticipated expiration: 2032-01-04

Abstract

The invention provides a pressure reducing pipe device for underground structure construction, which comprises: the steel pipe is arranged in a hollow mode, and a pipe body of the steel pipe is provided with a water inlet hole; the filter pipe is arranged in the steel pipe; the steel pipe is used for being partially inserted into the stratum so as to lead out liquid in the stratum from the steel pipe, and the filter pipe is used for filtering the liquid passing through. The pressure reducing pipe device for underground structure construction can reduce the formation pressure.

Description

Pressure reducing pipe device for underground structure construction

Technical Field

The invention relates to the field of underground construction, in particular to a pressure reducing pipe device for underground structure construction.

Background

At present in the underground construction field, if when deep basal pit is under construction, for ensureing excavation safety, prevent the foundation ditch seepage and gush water, generally adopt the precipitation reduction stratum flood peak height outside the foundation ditch, reduce soil and water pressure, the precipitation device that often uses is the tube well.

Traditional tube well precipitation is through boring at the peripheral ground of foundation ditch perpendicularly, draws water in the well behind the installation tube well, reduces the peripheral flood peak height of well and soil and water pressure. There is the limitation when traditional tube well device is under construction, and is first, and drilling and installation tube well require great to the construction site area, and if the peripheral construction site of foundation ditch is narrow and small, then be difficult to carry out ground precipitation construction. Secondly, the pipe well precipitation conflicts with grouting reinforcement, and if grouting reinforcement is still needed outside the pit after the pipe well construction is completed, the pipe well is easily blocked and loses efficacy by cement slurry. Third, the tube well is typically constructed vertically from the surface, and if there is an underground structure, it is not possible to depressurize the ground below the structure. Fourth, the construction cost of the pipe well is relatively high.

Disclosure of Invention

The embodiment of the invention provides a pressure reducing pipe device for underground structure construction, which at least solves the problem caused by pipe well precipitation in the related art.

According to an embodiment of the present invention, there is provided a pressure reducing pipe apparatus for underground structure construction, including:

the steel pipe is arranged in a hollow mode, and a pipe body of the steel pipe is provided with a water inlet hole; and

the filter pipe is arranged in the steel pipe;

the steel pipe is used for being partially inserted into the stratum so as to lead out liquid in the stratum from the steel pipe, and the filter pipe is used for filtering the liquid passing through.

Further, the pressure reducing pipe device for underground structure construction further comprises a valve, and the valve is installed at one end, located outside the stratum, of the steel pipe.

Furthermore, the steel pipe is circular, the end of the steel pipe entering the stratum is conical, and the exposed end of the steel pipe is a threaded screw head and is used for installing a valve.

Furthermore, a plurality of inlet openings evenly set up in the steel pipe shaft.

Furthermore, a plurality of inlet openings divide into the multiunit and arrange in the steel pipe shaft, and every group inlet opening is evenly distributed about from top to bottom along the pipe shaft respectively.

Furthermore, the filter pipe is a steel cylindrical pipe network, the outer diameter of the filter pipe is matched with the inner diameter of the steel pipe, and the filter pipe can be inserted into and pulled out of the steel pipe.

Has the advantages that: the pressure reducing pipe device for underground structure construction solves the problems that the traditional pipe well precipitation construction site is high in requirement, incompatible with stratum grouting reinforcement, incapable of reducing the precipitation below an underground structure and relatively high in cost, and can also solve the problem that the sealed stratum grouting pressure is too high.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a sectional view of a pressure reducing pipe apparatus for underground structure construction according to an embodiment of the present invention;

FIG. 2 is a schematic view of a construction for widening reconstruction;

fig. 3 is used for the construction purpose of the air shaft.

The names of the parts represented by numbers or letters in the drawings are as follows:

1. a concrete structure; 2. a steel pipe; 3. a filter tube; 4. spinning heads; 5. a water inlet hole; 100. a pressure reducing pipe device for underground structure construction; A. the original structure; B. widening area C and grouting holes.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Referring to fig. 1, an embodiment of the present invention provides a pressure reducing pipe device for underground structure construction, including:

the steel pipe 2 is hollow, and a pipe body of the steel pipe 2 is provided with a water inlet hole 5; and

the filter pipe 3 is arranged in the steel pipe 2;

the steel pipe 2 is used for being partially inserted into the stratum so as to lead out liquid in the stratum from the steel pipe 2, and the filter pipe 3 is used for filtering the liquid passing through. In the figure, the concrete structure 1 is shown outside the ground formation, and a steel pipe 2 is inserted through the concrete structure 1 and into the ground formation.

Further, the pressure reducing pipe device for underground structure construction further comprises a valve (not shown), and the valve is installed at one end of the steel pipe 2, which is located outside the ground.

Furthermore, the steel pipe 2 is circular, the end of the steel pipe entering the stratum is conical, and the exposed end of the steel pipe is a threaded screw head 4 for installing a valve.

Further, a plurality of inlet openings 5 evenly set up in 2 pipe shafts of steel pipe.

Further, a plurality of inlet openings 5 divide into the multiunit and arrange 2 pipe shafts of steel pipe, and every inlet opening 5 of group is evenly distributed about upper and lower respectively along the pipe shaft.

Further, the filter pipe 3 is a steel cylindrical pipe network, the outer diameter of the filter pipe is matched with the inner diameter of the steel pipe 2, and the filter pipe can be inserted into and pulled out of the steel pipe 2.

The utility model discloses a work flow:

1. and determining the installation position of the pressure reducing pipe device.

2. And (4) forming holes in the stratum, wherein the hole forming depth is the thickness of the structural layer minus the thickness of the protective layer on the soil facing side of the structure.

3. The steel pipe 2 is rammed into the formation to a specified depth using a pipe rammer.

4. The steel pipe 2 is internally provided with a built-in filter pipe 3.

5. And installing a valve at the exposed end of the steel pipe 2 to complete the installation of the pressure reducing pipe device.

6. And opening the valve, observing the drainage speed and the silt content in water, and adjusting the filter pipe according to actual conditions.

7. After the pressure reducing pipe device is used, the pressure reducing pipe device can be directly used as a grouting pipe, and after the internal filter pipe 3 is taken out and grouting filling is carried out, subsequent device cutting and structure recovery work are carried out.

Specifically, the method comprises the following steps:

1) the diameter of the stratum opening is 1-2mm larger than that of the steel pipe 2, and the opening depth is the thickness of the structural layer minus the thickness of the protective layer on the soil facing side of the structure.

2) After the tapping is completed, the steel pipe 2 is immediately rammed into the hole and a ball valve is installed on the steel pipe stub 4 and closed. The depth of the steel pipe 2 into the stratum is determined according to the requirement, and is generally 1-2 m. And winding hemp threads in the contact area of the steel pipe 2 and the concrete structure 1, filling the gap between the steel pipe 2 and the concrete structure 1, and plugging the periphery of the steel pipe 2 exposed out of the concrete structure 1 by using quick-hardening cement.

3) The ball valve is opened, and the steel dense-mesh filter pipe 3 which can be drawn out is arranged in the steel pipe 2. When the pressure is reduced, the drainage flow is controlled by the ball valve.

4) And after the pressure reducing pipe device is used, grouting and sealing are performed by using the pressure reducing pipe device.

Specifically, the valve is opened, the filter pipe 3 in the steel pipe 2 is drawn out, then the valve is closed, and grouting can be started after the valve is connected with a grouting pipe. And after grouting is finished, cutting off the steel pipe 2 until the distance between the steel pipe 2 and the inner surface of the concrete 1 is not less than 60mm, drilling an expansion bolt in the hole for limiting, and plugging the hole by using quick cement.

For traditional ground pipe well precipitation device, this utility model has following advantage:

1. the construction is convenient, the use is flexible, and in the area where the ground pipe well precipitation can not be implemented, the horizontal pressure reducing pipe can be applied in the underground structure to drain water and reduce pressure in the stratum of the area.

2. Ground precipitation well often leads to the tube well to become invalid because of the slip casting is consolidated, perhaps because of the stratum is kept apart the precipitation effect by the grout poor, and the construction of ground horizontal pressure-reducing pipe is nimble, can use in the inside corresponding position of underground structure and carry out pertinence drainage step-down.

3. The adjustable dense-mesh filter screen is flexibly applicable to various stratums by adjusting the opening of the steel pipe and adjusting the internal dense-mesh filter screen.

4. If only need local when stepping down in underground structure construction or transformation process, can preferentially use the device, construction cost is low, and is fast.

5. The device can be used for the second time after use and is used as a grouting floral tube.

6. The device can be used in a matched manner when grouting is carried out on the closed stratum at the periphery of the underground structure, so that the larger stratum pressure generated by construction is effectively eliminated, injected slurry reaches the position to be injected by the device in a guiding manner, and the device can be used as a construction matching device for deep foundation pit excavation surge plugging, underground structure grouting plugging and the like.

The following is the practical use case of the present invention, as shown in fig. 2, the widening reconstruction is performed as an example, in the figure, a is the original structure, B is the widening area, and 100 is the step-down pipe device for underground structure construction. When reforming transform regional foundation ditch excavation, need reduce stratum water and soil pressure to the stratum precipitation, because this region of current situation can't carry out ground tube well precipitation, there is great risk of gushing water new and old structure juncture when reforming transform regional foundation ditch excavation, and the on-the-spot step-down pipe of executing on existing structure carries out the drainage step-down, reduces the stratum pressure of the department of plugging into, has guaranteed the safety of excavation, has finally accomplished the excavation and the structure construction of reforming transform the foundation ditch smoothly.

Another example is wind shaft construction, as shown in fig. 3, C is a grouting hole, and 100 is a pressure reducing pipe device for underground structure construction. The air shaft adopts a first-tunnel and second-well construction method, a larger water inrush risk exists in a circular seam between a shield tunnel segment and an air shaft foundation pit support structure, and a foundation pit end stratum must be treated before excavation. Because a large amount of cement paste is injected into the end head reinforcing area on the outer side of the foundation pit before, the grouting pressure of the airtight stratum outside the tunnel is higher when grouting is performed in the tunnel subsequently, and the grouting pressure reaches 2 mpa. In order to reduce the grouting pressure and ensure that the subsequent grouting is smoothly carried out, a horizontal pressure reducing pipe device (also used as a right line grouting hole) is installed in advance on the right line of the tunnel before the left line grouting of the tunnel on site, and when the left line grouting is carried out, the pressure reducing pipe device on the corresponding right line pipe piece is opened to carry out controlled drainage and pressure reduction.

After the device is adopted for reducing the pressure, the grouting pressure in the tunnel is found to be remarkably reduced, the grouting pressure is maintained at 0.4-0.8 mpa, the grouting can be continuously carried out, and about 60t of cement is additionally injected in a single cavity. After grouting is finished, detecting the probe holes 70cm after the probe holes extend into the pipe piece, finding that no water flows out of all the probe holes, successfully grouting, and plugging and compacting the water seepage channels, thereby indicating that the pressure reducing pipe device is successfully applied to grouting of a closed stratum.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.

Claims

1. A step-down pipe device for underground structure construction, comprising:

the filter pipe is arranged in the steel pipe;

2. The pressure reducing pipe device for underground structure construction as claimed in claim 1, further comprising a valve installed at one end of the steel pipe located outside the ground.

3. The pressure reducing pipe apparatus for underground structure construction as claimed in claim 2, wherein the steel pipe is round, and has a conical end entering the ground and a screw thread end exposed outside for installing a valve.

4. The pressure reducing pipe apparatus for underground structure construction as claimed in claim 1, wherein a plurality of water inlet holes are uniformly provided in the steel pipe body.

5. The pressure reducing pipe device for underground structure construction as claimed in claim 1, wherein the plurality of water inlet holes are divided into a plurality of groups and arranged on the steel pipe body, and the water inlet holes of each group are uniformly distributed up, down, left and right along the pipe body, respectively.

6. A pressure reducing pipe apparatus as claimed in claim 1, wherein the filtering pipe is a cylindrical steel pipe network, the outer diameter of which matches the inner diameter of the steel pipe and can be inserted into and pulled out of the steel pipe.