WO2021196657A1

WO2021196657A1 - Novel fabricated anchorage structure serving as both dewatering well and support, and construction method

Info

Publication number: WO2021196657A1
Application number: PCT/CN2020/130264
Authority: WO
Inventors: 武科; 郑扬; 孙杰; 韩宇聪; 罗浩天
Original assignee: 山东大学
Priority date: 2020-04-03
Filing date: 2020-11-20
Publication date: 2021-10-07
Also published as: CN111350202A

Abstract

A novel fabricated anchorage structure serving as both a dewatering well and a support, and a construction method, relating to the technical field of geotechnical engineering. The fabricated anchorage structure comprises a plurality of prefabricated general purpose tube segments (1) which are assembled in sequence; anchor rod notches (1.1) are reserved on the general purpose tube segments (1) in the front-back direction; anchor rod holes (9) can be formed after the adjacent general purpose tube segments (1) are assembled; bolt holes are reserved on the general purpose tube segments (1) in the left-right direction; dewatering well holes (1.2) are reserved on the general purpose tube segments (1) in the up-down direction; anchor rods (7) are driven into the wall of a foundation pit from the anchor rod holes (9) to form an anchor rod support, and bolts are mounted in the bolt holes to connect the adjacent general purpose tube segments (1) in the left-right direction; water pumping steel tubes (3) penetrate through the dewatering well holes (1.2); the lower ends of the water pumping steel tubes (3) stretch into a water layer, and the upper ends of the water pumping steel tubes (3) are connected to a water collecting main pipe; the water collecting main pipe is connected to a water pump; elastic sealing pads (8) are provided between the adjacent general purpose tube segments (1) in the up-down direction, and elastic sealing pads (8) are provided between the adjacent general purpose tube segments (1) in the left-right direction.

Description

A new type of prefabricated anchoring structure that doubles as dewatering well and support and construction method

Technical field

The technical field of the geotechnical engineering of the present invention is specifically a novel assembly type anchoring structure and construction method that also serves as a dewatering well and a support.

Background technique

Before the excavation of the foundation pit, a certain number of dewatering wells are excavated in advance based on calculations around the foundation pit, and the groundwater is continuously pumped by the pump before excavation, so that the groundwater level is lowered below the foundation pit, and the soil is consolidated. Improve the strength of the foundation. However, the well point method needs to drill first, and at the same time, it is necessary to use a protective tube to protect the orifice. When lifting the drilling, it should be carried out slowly to prevent the orifice from collapsing and clogging. Secondly, it is necessary to place the well pipe, backfill the stone and wash the hole. It is more complicated and cumbersome, and it is easy to cause project delays.

There are many forms of foundation pit support, such as soil nail wall, underground continuous wall, cast-in-place pile support and so on. The underground diaphragm wall has high rigidity and good water-stop effect, so it is the strongest supporting form in the supporting structure, but it has higher requirements on the construction site, and special equipment is required during the construction process. The temperature and humidity of the construction can easily lead to the cracking of the wall, which can not achieve the water-stop effect, so it is often treated with a water-stop curtain. This is the shortcoming of the prior art.

Summary of the invention

The technical problem to be solved by the present invention is to address the shortcomings of the prior art. The present invention proposes a new type of prefabricated anchoring structure and construction method that also serves as a dewatering well and a support, which is used in a foundation pit dewatering and support system. With the help of the construction and anchoring support method of the prefabricated building, it can not only play the role of well-point method for precipitation, but also play the role of water interception, seepage prevention, load bearing and water retaining as a new type of underground continuous wall, and overcome the temperature Limitation and disposal of waste mud.

This solution is achieved through the following technical measures: a new type of prefabricated anchoring structure that doubles as a dewatering well and a support includes a plurality of prefabricated general segments assembled in sequence, and the general segment is reserved in the front and rear directions Anchor rod groove, after assembling adjacent common segments, an anchor hole can be formed. The anchor rod is driven into the foundation pit wall in the anchor rod hole to form the anchor rod support, and the bolt is installed in the bolt hole to connect the adjacent common pipe segments in the left and right directions; The lower end of the pumping steel pipe extends into the water layer, and the upper end of the pumping steel pipe is connected to the water collection header, and the water collection header is connected to a pump; an elastic sealing gasket is arranged between adjacent general-purpose segments in the up and down direction. Elastic sealing gaskets are arranged between adjacent general-purpose tube segments in the left-right direction.

Preferably, the cross section of the universal tube segment is a right-angled trapezoidal structure, the slopes of two adjacent universal tube segments in the left and right direction are spliced into a universal tube segment group, and two adjacent groups of universal tube segment groups are adjacent in the up and down direction. The staggered setting of the splicing seams effectively ensures the stability of the general segment assembly.

Preferably, a filter screen is provided at the lower end of the water pumping steel pipe, and the upper end of the water pumping steel pipe is connected to the water collecting header through a rubber tube. The filter screen can play a filtering role, and the rubber tube is arranged to facilitate the connection of the pumping steel pipe and the water collecting main pipe. The rubber tube ensures good air tightness between the pumping steel pipe and the water collecting main pipe.

Preferably, the height of the universal segment is 3m, the upper short side is 2m, the lower short side is 3m, and the thickness is 1.2m. The diameter of the bolt hole is 120mm, and the diameter of the dewatering well is 300mm. The outer diameter of the steel pipe is 300mm. The outer diameter of the pumping steel pipe is the same as the diameter of the dewatering well hole, which effectively ensures the stability of the pumping steel pipe installed in the dewatering well hole. Only one clamp is required to be installed on the pumping steel pipe. The clamp is located at the highest position. The upper end of the pipe segment can effectively locate the pumping steel pipe. In conventional designs, the outer diameter of the pumping steel pipe is generally smaller than the diameter of the dewatering well hole. The concrete slurry is poured between the outer wall and the dewatering well hole, so that it is not convenient to place pumping steel pipes in the dewatering well hole multiple times, and it is difficult to meet the demand for multiple dewatering.

Preferably, after the assembling of the anchoring structure is completed, the concrete slurry is poured into the hole of the dewatering well to form a pouring pile, which further ensures the stability of the connection of the universal segment.

Preferably, the upper end surface, the lower end surface, the left end surface and the right end surface of the universal tube piece are provided with a sealing groove, and the elastic sealing gasket is arranged in the sealing groove.

A new type of construction method of a prefabricated anchoring structure that doubles as a dewatering well and a support: It includes the following steps:

(1) The factory prefabricates general-purpose segments and transports them to the construction site;

(2) Excavate the foundation pit according to the construction drawings. In order to ensure the quality of the construction, carry out the measurement in advance on the flat site and mark the line of the foundation pit to be excavated, clean the mud in the foundation pit, and ensure the flatness of the foundation pit wall;

(3) Use the hoisting machine to place the universal pipe segments in the foundation pit and close to the wall of the foundation pit vertically. Place elastic gaskets between adjacent universal pipe segments, and connect adjacent universal pipe segments to form anchor rod holes. , Adjacent universal pipe segments in the left and right direction are fixedly connected by bolts, the dewatering well holes of the adjacent universal pipe segments are aligned in the up and down direction, and the anchor rod is driven into the anchor rod hole in the front and rear direction to make the anchor rod extend Into the wall of the foundation pit;

(4) Put the pumping steel pipe into the dewatering well hole and fix it, the lower end of the pumping steel pipe extends into the water layer, and the upper part of the pumping steel pipe is connected with the water collection main pipe, and the water pump connected with the water collection main pipe is started to perform the well point precipitation;

(5) When the safety height for the next excavation of the foundation pit is reached by dewatering through the well point, the pumped steel pipe is drawn out, the depth of the foundation pit is pre-excavated according to the construction drawings, and the general-purpose segments are installed in sequence downwards. One of the adjacent general-purpose segments Place elastic sealing gaskets between them, and the adjacent common pipe segments are spliced to form anchor rod holes. The adjacent common pipe segments in the left and right directions are fixedly connected by bolts, and the adjacent dewatering well holes are aligned in the up and down direction, Drive the anchor rod from the anchor rod hole to make the anchor rod go deep into the wall of the foundation pit. According to the excavation depth of the foundation pit, reasonably select the number of pieces of general-purpose segment to be installed downward;

(6) According to the excavation depth of the foundation pit, reasonably arrange the number of well point precipitation, repeat steps (4) and (5) until the underground continuous wall of the foundation pit is formed;

(7) Finally, pour concrete slurry into the dewatering well hole to form a pouring pile.

Preferably, in step (2), the trenching machine excavates with grab buckets in different trench sections and batches according to the foundation pit line measured on the ground and the geological conditions of the site. The machine excavates the trough section between the two holes to make it through, and completes the excavation of the trough section. After the excavation of each section of the trough section is completed, the construction personnel need to carry out the cement slurry surface treatment, and the cement slurry is mixed in the high-speed mixer. , The material is charged strictly according to the construction mix ratio. The cement-water glass double-liquid grouting parameters are: water glass modulus M=2.8～3.1, water glass solution concentration Be′=35～40, cement slurry water-cement ratio is 0.75:1 ～1.0:1, the volume ratio of cement slurry to water glass is 1:0.5～1:1.0. After the excavation of the groove section is completed, the grout is applied to the surface and then the general segment is installed.

Preferably, a filter screen is provided at the lower end of the water pumping steel pipe, and the upper end of the water pumping steel pipe is connected to the water collecting header through a rubber tube.

Preferably, the cross section of the universal tube segment is a right-angled trapezoidal structure, the cross section of the universal tube segment is a right-angled trapezoidal structure, and the inclined surfaces of two adjacent universal tube segments in the left-right direction are spliced into a universal tube segment group, The splicing seams between adjacent two sets of general segment groups are arranged staggered in the up and down direction.

Compared with the prior art, the beneficial effects of the present invention are:

(1) In terms of processing: Prefabrication of general-purpose segments in the factory omits on-site engineering measures such as drilling of dewatering wells, clearing holes, and backfilling sand, which greatly shortens the construction period and reduces engineering costs. It is suitable for a variety of weak formations and shallow The geological conditions such as buried stratum and low groundwater level are adjustable.

(2) In terms of dewatering wells: pumping steel pipes are installed as vacuum dewatering wells through the dewatering well holes reserved on the general segment. Not only the air tightness of the dewatering wells is good, but also a series of measures such as drilling, clearing and backfilling are omitted. , Shorten the construction period and reduce costs.

(3) Foundation pit support: After the anchoring structure is assembled, concrete slurry can be injected into the dewatering well hole reserved on the general segment to form a cast-in-place pile, which further enhances the stability of the connection of the universal segment.

(4) Construction: In the construction process, it can be divided into multiple precipitations, multiple excavations, and multiple downward installation of general-purpose segments. During the excavation process, the anchor rod can be used to support the general purpose of the position. Tube piece.

It can be seen that, compared with the prior art, the present invention has outstanding substantive features and significant progress, and the beneficial effects of its implementation are also obvious.

Description of the drawings

In order to explain the technical solution of the present invention more clearly, the following will briefly introduce the drawings that need to be used in the description. Obviously, the drawings in the following description are only some embodiments of the present invention. As far as personnel are concerned, they can also obtain other drawings based on these drawings without creative work.

Figure 1 is a front view of a new type of prefabricated anchoring structure that doubles as a dewatering well and support;

Figure 2 is a top view of the new fabricated anchoring structure that doubles as a dewatering well and support.

Figure 3 is a side view of the new assembled anchoring structure that doubles as a dewatering well and support.

Figure 4 is the overall effect diagram of the new fabricated anchoring structure that doubles as a dewatering well and support.

Figure 5 is a new type of bolt diagram of the assembled anchoring structure that doubles as a dewatering well and support.

In the picture: 1-universal segment, 1.1-anchor groove, 1.2-dewatering well hole, 2-splicing joint, 3-pumping steel pipe, 4-filter mesh, 5-rubber tube, 6-pressure plate, 7- Anchor rod, 8-elastic gasket, 9-bolt hole.

Detailed ways

In order to make the objectives, features, and advantages of the present invention more obvious and understandable, specific embodiments and drawings will be used below to clearly and completely describe the technical solutions protected by the present invention. Obviously, the implementation described below The examples are only a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments in this patent, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the scope of protection of this patent.

Example 1

As shown in the figure, a new type of prefabricated anchoring structure that doubles as a dewatering well and a support includes a plurality of prefabricated general segments 1 assembled in sequence. The general segment 1 is reserved with bolt grooves 1.1 in the front and rear directions. After assembling, adjacent general-purpose segments 1 can form bolt holes 9. The general-purpose segment 1 is reserved with bolt holes in the left and right directions, and the general segment 1 is reserved with dewatering well holes 1.2 in the up and down direction. , Drive the anchor rod 7 into the foundation pit wall from the anchor rod hole 9 to form the anchor rod support, install the bolt in the bolt hole to connect the adjacent common pipe segments 1 in the left and right directions, and can be installed through the dewatering well hole 1.2 There is a pumping steel pipe 3, the lower end of the pumping steel pipe 3 extends into the water layer, the upper end of the pumping steel pipe 3 is connected with a water collection header, the water collection header is connected with a water pump, and the general-purpose tube segments adjacent in the up and down direction An elastic sealing gasket 8 is arranged between 1 and an elastic sealing gasket 8 is arranged between adjacent general-purpose tube pieces 1 in the left-right direction. The elastic sealing gasket 8 is an EPDM rubber gasket.

The cross section of the universal tube piece 1 is a right-angled trapezoidal structure, and the inclined surfaces of two adjacent two universal tube pieces 1 in the left and right direction are spliced into a universal tube piece group. The stitching seams between 2 are staggered.

The lower end of the pumping steel pipe 3 is provided with a filter screen 4, and the upper end of the pumping steel pipe 3 is connected to the water collecting header through a rubber tube 5.

The height of the universal segment 1 is 3m, the upper short side is 2m, the lower short side is 3m, and the thickness is 1.2m. The diameter of the bolt hole 9 is 120mm, and the diameter of the dewatering well hole 1.2 is 300mm. The outer diameter of the steel pipe 3 is 300 mm.

After the anchoring structure is assembled, pour concrete slurry into the dewatering well hole 1.2 to form a pouring pile.

The upper end surface, the lower end surface, the left end surface and the right end surface of the universal tube piece 1 are provided with sealing grooves, and the elastic sealing gasket 8 is arranged in the sealing groove.

Example 2

(1) The factory prefabricates general segment 1 and transports it to the construction site;

(3) Use the hoisting machine to place the universal segment 1 in the foundation pit and place it close to the wall of the foundation pit vertically. Place an elastic gasket 8 between the adjacent universal segments 1, and the adjacent universal segments 1 are spliced to form an anchor The rod hole 9 is fixedly connected by bolts to the adjacent universal tube segments 1 in the left and right direction. The dewatering well holes 1.2 of the adjacent universal tube segments 1 are aligned in the up and down direction, and the anchor rod hole 9 is drilled in the front and back direction. The anchor rod 7 is inserted so that the anchor rod 7 extends into the wall of the foundation pit; in order to ensure the safety of the construction site and prevent the collapse of the general segment 1, the hoisting machine needs to be hoisted until the construction personnel connect the bolts firmly and drive the anchor rod 7 into In the wall of the foundation pit;

(4) Put the pumping steel pipe 3 into the dewatering well hole 1.2 and fix it. The lower end of the pumping steel pipe 3 extends into the water layer. Water pump for well point precipitation;

(5) When the safety height of the next excavation of the foundation pit is reached through the well point, the pumping steel pipe 3 is drawn out, and the depth of the foundation pit is pre-excavated according to the construction drawings. An elastic gasket 8 is placed between the sheets 1, and the adjacent general-purpose tube sheets 1 are butt-connected to form an anchor rod hole 9. The adjacent general-purpose tube sheets 1 are fixedly connected by bolts in the vertical direction Align the hole 1.2 of the dewatering well, and drive the anchor rod 7 from the anchor rod hole 9 in the front and back direction to make the anchor rod 7 penetrate into the wall of the foundation pit. According to the excavation depth of the foundation pit, choose the piece of universal segment 1 to be installed downward. number;

(7) Finally, pour concrete slurry into the dewatering well hole 1.2 to form a pouring pile.

Example 3

The difference from Example 2 is that in step (2), the trenching machine excavates different trench sections and batches with grab buckets according to the foundation pit line measured on the ground and on-site geological conditions, and the rotary drilling rig excavates in turn After the two guide holes, the excavator digs the groove section between the two holes to make it through, and completes the excavation of the groove section. After the excavation of each section of the groove section is completed, the construction personnel need to carry out the cement slurry surface treatment. The mixing is carried out in a high-speed mixer, and the materials are charged in strict accordance with the construction mix ratio. The cement-water glass two-fluid grouting parameters are: water glass modulus M=2.8～3.1, water glass solution concentration Be′=35～40, cement slurry The water-cement ratio is 0.75:1～1.0:1, and the volume ratio of cement slurry to water glass is 1:0.5～1:1.0. After the excavation of the trough section is completed, the grout surface treatment is performed and the general segment 1 is installed. Preferably, the water glass modulus M=2.8, the water glass solution concentration Be'=35, the cement slurry water cement ratio is 0.75:1, and the volume ratio of cement slurry to water glass is 1:0.5.

The lower end of the pumping steel pipe 3 is provided with a filter screen 4, and the upper end of the pumping steel pipe 3 is connected to the water collecting header through a rubber tube 5. The cross section of the universal tube segment 1 is a right-angle trapezoidal structure, the cross-section of the universal tube segment 1 is a right-angle trapezoidal structure, and the bevels of two adjacent universal tube segments 1 in the left-right direction are spliced into a universal tube segment group. The splicing seams 2 between the adjacent two sets of general segment groups in the up and down direction are arranged in a staggered manner.

Compared with the prior art, this embodiment has the following advantages:

(1) In terms of processing: Prefabricated general segment 1 in the factory omitted the on-site engineering measures such as drilling, clearing, and sand backfilling of dewatering wells, which greatly shortened the construction period and reduced the engineering cost. It is suitable for a variety of weak formations, The geological conditions such as shallow stratum and low groundwater level are adjustable.

(2) In terms of dewatering wells: In the dewatering well hole 1.2 reserved on the general segment 1, a pumping steel pipe 3 is installed as a vacuum dewatering well, which not only has good airtightness of the dewatering well, but also omits drilling, clearing and backfilling. A series of measures to shorten the construction period and reduce costs.

(3) Foundation pit support: After the anchoring structure is assembled, concrete slurry can be injected into the dewatering well hole 1.2 reserved on the general segment 1 to form a cast-in-place pile, which further enhances the stability of the connection of the general segment 1 .

(4) Construction: During the construction process, it can be divided into multiple precipitations, multiple excavations, and multiple downward installation of the general segment 1. During the excavation process, the anchor rod 7 can be used to support the upper position. The universal tube piece 1.

The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this text, but should conform to the widest scope consistent with the principles, novel features, and creative features disclosed in this text.

Claims

A new type of prefabricated anchoring structure that doubles as a dewatering well and a support is characterized in that it includes a plurality of prefabricated general segments assembled in sequence, and the general segment is reserved with anchor grooves in the front and rear directions, and adjacent Anchor rod holes can be formed after assembly of the universal segment, the universal segment is reserved with bolt holes in the left and right directions, and the universal segment is reserved with dewatering well holes in the up and down direction. Driven into the wall of the foundation pit to form anchor rod support, install bolts from the bolt holes to connect the adjacent common pipe segments in the left and right directions; pumping steel pipes can be installed through the dewatering well holes, and the lower end of the pumping steel pipes is inserted into the water Layer, the upper end of the water pumping steel pipe is connected with the water collecting main pipe, and the water collecting main pipe is connected with a water pump; an elastic sealing gasket is arranged between the adjacent common pipe segments in the up and down direction, and the adjacent common pipe in the left and right directions An elastic sealing gasket is arranged between the tube segments.
The new fabricated anchoring structure for both dewatering wells and support according to claim 1, characterized in that: the cross section of the general segment is a right-angle trapezoidal structure, and two adjacent general segments are arranged in the left and right directions. The inclined planes of the two groups are spliced into a common segment group, and the splicing seams of two adjacent groups of the common segment group are arranged in a staggered manner in the up and down direction.
The new fabricated anchoring structure for both dewatering wells and support according to claim 1, characterized in that: the lower end of the pumping steel pipe is provided with a filter screen, and the upper end of the pumping steel pipe is connected to the header pipe through a rubber pipe.
The new fabricated anchoring structure for both dewatering wells and support according to claim 2, characterized in that: the height of the general segment is 3m, the upper short side is 2m, the lower short side is 3m, and the thickness is 1.2m The diameter of the bolt hole is 120mm, the diameter of the dewatering well hole is 300mm, and the outer diameter of the pumping steel pipe is 300mm.
According to claim 1, the new fabricated anchoring structure for both dewatering well and support is characterized in that: after the anchoring structure is assembled, concrete slurry is poured into the dewatering well hole to form a pouring pile.
The new fabricated anchoring structure for both dewatering wells and support according to claim 2, characterized in that: the upper end surface, the lower end surface, the left end surface and the right end surface of the universal segment are all provided with sealing grooves, the The elastic sealing gasket is arranged in the sealing groove.
A new type of construction method of a prefabricated anchoring structure that doubles as a dewatering well and a support: It is characterized in that it includes the following steps:

(1) The factory prefabricates general-purpose segments and transports them to the construction site;

(2) Excavate the foundation pit according to the construction drawings. In order to ensure the quality of the construction, carry out the measurement in advance on the flat site and mark the line of the foundation pit to be excavated, clean the mud in the foundation pit, and ensure the flatness of the foundation pit wall;

(3) Use the hoisting machine to place the universal pipe segments in the foundation pit and close to the wall of the foundation pit vertically. Place elastic gaskets between adjacent universal pipe segments, and connect adjacent universal pipe segments to form anchor rod holes. , Adjacent universal pipe segments in the left and right direction are fixedly connected by bolts, the dewatering well holes of the adjacent universal pipe segments are aligned in the up and down direction, and the anchor rod is driven into the anchor rod hole in the front and rear direction to make the anchor rod extend Into the wall of the foundation pit;

(4) Put the pumping steel pipe into the dewatering well hole and fix it, the lower end of the pumping steel pipe extends into the water layer, and the upper part of the pumping steel pipe is connected with the water collection main pipe, and the water pump connected with the water collection main pipe is started to perform the well point precipitation;

(5) When the safety height for the next excavation of the foundation pit is reached by dewatering through the well point, the pumped steel pipe is drawn out, the depth of the foundation pit is pre-excavated according to the construction drawings, and the general-purpose segments are installed in sequence downwards. One of the adjacent general-purpose segments Place elastic sealing gaskets between them, and the adjacent common pipe segments are spliced to form anchor rod holes. The adjacent common pipe segments in the left and right directions are fixedly connected by bolts, and the adjacent dewatering well holes are aligned in the up and down direction, Drive the anchor rod from the anchor rod hole to make the anchor rod go deep into the wall of the foundation pit. According to the excavation depth of the foundation pit, reasonably select the number of pieces of general-purpose segment to be installed downward;

(6) According to the excavation depth of the foundation pit, reasonably arrange the number of well point precipitation, repeat steps (4) and (5) until the underground continuous wall of the foundation pit is formed;

(7) Finally, pour concrete slurry into the dewatering well hole to form a pouring pile.
The construction method of a new type of prefabricated anchoring structure that doubles as a dewatering well and a support according to claim 7, characterized in that: in step (2), the trenching machine is divided according to the foundation pit line measured on the ground and the geological conditions of the site. Different groove sections are excavated in batches with grab buckets. After the rotary drilling rig digs two pilot holes in turn, the excavator digs the groove section between the two holes to make it through to complete the excavation of the groove section. After the excavation of the section is completed, the construction personnel need to carry out the cement slurry surface treatment. The cement slurry is stirred in a high-speed mixer, and the materials are charged in strict accordance with the construction ratio. The cement-water glass double-liquid grouting parameter is: water glass modulus M = 2.8～3.1, the concentration of water glass solution Be'=35～40, the water-cement ratio of cement slurry is 0.75:1～1.0:1, the volume ratio of cement slurry and water glass is 1:0.5～1:1.0, the excavation of the trench section After the completion of the cement grout surface treatment, the general-purpose segment is installed.
The construction method of a new type of assembly anchoring structure that doubles as a dewatering well and a support according to claim 7, characterized in that: the lower end of the pumping steel pipe is provided with a filter screen, and the upper end of the pumping steel pipe is connected to the water collecting pipe through a rubber pipe. Header connection.
The construction method of a novel assembly anchoring structure that also serves as a dewatering well and a support according to claim 7, wherein the cross section of the general segment is a right-angle trapezoidal structure, and the cross-section of the universal segment is a right-angle trapezoidal structure , In the left and right directions, the bevels of two adjacent general tube segments are spliced into a general tube segment group, and the splicing seams between the two adjacent groups of general tube segment groups in the up and down direction are arranged in a staggered manner.