CN218816524U - Horizontal precipitation device for water-rich sand layer tunnel construction - Google Patents

Abstract

The utility model discloses a rich water sand bed tunnel construction level precipitation device, include from tunnel just prop up structural layer (1) squeeze into well coarse sand layer (2) and along a plurality of preceding dive collecting pipe (3) that tunnel length direction interval set up, respectively with every a plurality of lateral drainage pipe (5), water inlet and a plurality of that the outer end of preceding dive collecting pipe (3) is connected drain house steward (8), the import that drain house steward (5) all communicate with water pump (9) that the delivery port of drain house steward (8) is connected, with water catch bowl (10) of the exit linkage of water pump (9), the pipe wall of preceding dive collecting pipe (3) is in a plurality of holes (31) of permeating water have been seted up in the position at well coarse sand layer (2) place, preceding dive collecting pipe (3) are provided with filter screen (32) in hole (31) department of permeating water. This horizontal dewatering device of rich water sand bed tunnel construction once only solves the water leakage hidden danger, has both guaranteed later stage construction safety and quality, has saved the time limit for a project again.

Description

Horizontal precipitation device for water-rich sand layer tunnel construction

Technical Field

The utility model relates to a drainage device technical field especially relates to a rich water sand bed tunnel construction level precipitation device.

Background

When the urban rail transit engineering is constructed in underground excavation, no accumulated water in the pilot tunnel needs to be ensured in the construction process. The tunnel is crossing rich water sand bed construction for the reason that the sand bed water permeability is strong for conventional well casing precipitation can't be with secret runoff water pump drainage to municipal administration rainwater pipe network completely, and inside the partly stagnant water can be leaked to the undercut structure through the primary support structure who has formed, made it can't guarantee the anhydrous operating condition of later stage secondary lining work progress. Meanwhile, the primary support leaks water for a long time, and the high sand-containing water flow can cause cavities to appear on the outer side of the primary support, so that the ground and pipelines are further settled, and even the road surface collapses and other safety risks.

The conventional solution is to carry out cement-water glass slurry deep hole grouting and plugging outside the primary support along the inner edge of the tunnel, and has the advantages that a closed shell can be formed on the underground excavated section, underground water cannot flow in, and sand fixation and water stop are carried out quickly. The method has the defects that once the deep hole grouting is carried out on a sand layer, the permeability coefficient of the sand layer is large, slurry flows into the well casing dewatering well along with underground water before being coagulated, the dewatering well fails completely before the formation of the second lining, and the primary support floats upwards due to the buoyancy effect of water. Meanwhile, if leakage occurs again after grouting in the initial support, the ground and the pipeline can be raised by multiple times of grouting, and irreversible damage is caused to surrounding structures. Thirdly, the grouting reinforcement and the multiple grouting can cause the waste of capital and can not permanently cure the symptom.

In summary, how to effectively solve the problems of water leakage hidden danger and the like is a problem which needs to be solved urgently by technical personnel in the field at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a rich water sand bed tunnel construction level precipitation device, this rich water sand bed tunnel construction level precipitation device once only solve the percolating water hidden danger, have both guaranteed later stage construction safety and quality, have saved the time limit for a project again.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model provides a rich water sand layer tunnel construction level precipitation device, includes from the tunnel just prop up a structural layer and squeeze into in the coarse sand layer and along a plurality of advanced dive collecting pipe that tunnel length direction interval set up, respectively with every a plurality of branch drain pipe, water inlet and a plurality of that advanced dive collecting pipe's outer end is connected the drain main, the import and the water pump that the delivery port of drain main is connected, with water pump's exit linkage's water catch bowl, advanced dive collecting pipe's pipe wall is in a plurality of holes of permeating water have been seted up to the position that the coarse sand layer was located, advanced dive collecting pipe is provided with the filter screen in the hole department of permeating water.

Preferably, the axial direction of the advanced dive collection pipe is along the horizontal direction;

preferably, a set distance is reserved between an outer end water permeable hole in the advanced diving collecting pipe and the inner wall of the tunnel primary support structure layer;

the depth of the advanced submersible collecting pipe driven into the medium coarse sand layer is greater than the set depth.

Preferably, the advanced submersible collecting pipe is internally plugged with a steel wire mesh at the position of the permeable hole.

Preferably, the water permeable holes have set intervals on the pipe wall of the advanced diving collection pipe;

the water permeable holes are arranged on the pipe wall of the advanced diving collecting pipe in a quincunx shape.

Preferably, the front end of the advanced diving collection pipe is in a pointed cone shape;

the front end of the advanced diving collecting pipe is closed.

Preferably, the advanced dive collection pipe and the drain branch pipe are connected through a 90-degree elbow.

Preferably, the branch drain pipe and the main drain pipe are PPR pipes, and the branch drain pipe and the main drain pipe are connected by a three-way joint.

Preferably, the main drainage pipe is arranged at the bottom of the primary support structure layer of the tunnel, the main drainage pipe is arranged along the horizontal direction, and the branch drainage pipe is arranged along the vertical direction.

Preferably, the outer wall of the tunnel primary support structure layer is provided with a holding tank, and the drainage branch pipes and the drainage main pipe are placed in the holding tank.

The utility model provides a rich water sand bed tunnel construction level precipitation device, including a plurality of preceding dive collecting pipe, a plurality of branch drain pipe, main drain pipe, water pump, water catch bowl. The advanced diving collecting pipe is arranged at intervals along the length direction of the tunnel, the number of the advanced diving collecting pipe is multiple, the advanced diving collecting pipe is arranged on the medium coarse sand layer, and the medium coarse sand layer is driven into the medium coarse sand layer from the primary support structure layer of the tunnel. Simultaneously, seted up a plurality of holes of permeating water on the pipe wall of advanced dive collecting pipe, a plurality of holes of permeating water specifically set up the position at well coarse sand layer place, and well coarse sand layer ponding gets into advanced dive collecting pipe through the hole of permeating water, and the working face is in anhydrous work state when guaranteeing tunnel construction, ensures construction safety. In order to prevent silt from blocking the advanced submersible collecting pipe, a filter screen is arranged at the position of the water permeable hole to block the silt outside the advanced submersible collecting pipe.

The outer end of the advanced diving collection pipe leaks outwards to form a primary support structure layer in the tunnel, the outer end of the advanced diving collection pipe is connected with the drainage branch pipes in a one-to-one correspondence mode, namely, each advanced diving collection pipe is connected with the corresponding drainage branch pipe, and accumulated water entering the advanced diving collection pipe is drained to the drainage branch pipes. The number of the branch drain pipes is multiple, the branch drain pipes are connected to a main drain main pipe, and accumulated water in each branch drain pipe is collected into the main drain main pipe. The water outlet of the main drainage pipe is connected with a water pump, and the water pump provides the main power of horizontal precipitation in the tunnel and discharges accumulated water in the main drainage pipe. The outlet of the water pump corresponds to the water collecting tank, accumulated water pumped by the water pump is discharged to the water collecting tank, water entering the water collecting tank is precipitated, and the precipitated accumulated water is pumped and discharged to the municipal rainwater pipe network at regular time.

The utility model provides a rich water sand bed tunnel construction level dewatering device is applicable to urban rail transit construction, in the underground excavation just prop up the structure work progress, increase horizontal dewatering device, take well head dewatering as the owner, horizontal dewatering device is assisted, finally reach the equilibrium point of supply and sluicing, drainage, groundwater control when realizing tunnel and passing rich water sand bed construction, reach the anhydrous operating condition in the underground excavation tunnel, be convenient for later stage waterproof and secondary lining construction, guaranteed construction quality, reduce the safety risk; the symptom of water leakage can be solved by one-time investment, and the investment of measure cost is greatly reduced; the hidden danger of water leakage is solved at one time by using the least investment of manpower and material resources, thereby not only ensuring the safety and the quality of later construction, but also improving the construction period of shallow-buried underground excavation construction.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a horizontal precipitation device for tunnel construction of a water-rich sand layer according to an embodiment of the present invention;

FIG. 2 is a working diagram of a horizontal precipitation device for the water-rich sand layer tunnel construction;

FIG. 3 is an enlarged view of FIG. 1 at A;

FIG. 4 is a schematic view of a forward dive collection tube;

fig. 5 is a sectional view of B-B in fig. 4.

The drawings are numbered as follows:

the tunnel early-supported structure layer 1, the medium-coarse sand layer 2, the advanced diving collecting pipe 3, the 90-degree elbow 4, the drainage branch pipe 5, the three-way joint 6, the hot melting point 7, the drainage main pipe 8, the water pump 9, the water collecting tank 10, the silty clay 11, the water permeable holes 31 and the filter screen 32.

Detailed Description

The core of the utility model is to provide a rich water sand bed tunnel construction level precipitation device, this rich water sand bed tunnel construction level precipitation device once only solves the percolating water hidden danger, has both guaranteed later stage construction safety and quality, has saved the time limit for a project again.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 5, fig. 1 is a schematic structural view of a horizontal precipitation device for water-rich sand tunnel construction according to an embodiment of the present invention; FIG. 2 is a working diagram of a horizontal precipitation device for the water-rich sand layer tunnel construction; FIG. 3 is an enlarged view of FIG. 1 at A; FIG. 4 is a schematic view of a forward dive collection tube; fig. 5 is a sectional view of B-B in fig. 4.

In a specific embodiment, the utility model provides a rich water sand bed tunnel construction level precipitation device, include from the tunnel just prop up structural layer 1 squeeze into in the gross sand layer 2 and along a plurality of preceding dive collecting pipe 3 that tunnel length direction interval set up, a plurality of branch drain 5 of being connected with every outer end of preceding dive collecting pipe 3 respectively, the drain 8 that water inlet and a plurality of branch drain 5 all communicate, the water pump 9 that the delivery port of import and drain 8 is connected, water catch bowl 10 with the exit linkage of water pump 9, a plurality of holes 31 of permeating water have been seted up to the pipe wall of preceding dive collecting pipe 3 in the position at the 2 places of gross sand layer, preceding dive collecting pipe 3 is provided with filter screen 32 in hole 31 department of permeating water.

In the structure, the horizontal precipitation device for the water-rich sand layer tunnel construction comprises a plurality of advanced diving collecting pipes 3, a plurality of drainage branch pipes 5, a drainage main pipe 8, a water pump 9 and a water collecting tank 10.

The preceding dive collecting pipe 3 sets up along tunnel length direction interval, and quantity is a plurality of, sets up the interval and confirms according to the condition of rich water sand bed water content, sets up to 5m for example the interval, and the quantity of arranging is confirmed according to tunnel length. The advanced diving collecting pipe 3 is arranged towards the medium coarse sand layer 2, the medium coarse sand layer 2 is driven into the tunnel primary support structure layer 1, and the powdery clay 11 is arranged on the medium coarse sand layer 2. Preferably, the advanced diving collecting pipe 3 is arranged towards the medium-coarse sand layer 2 perpendicular to the side wall of the tunnel primary support structure layer 1. Simultaneously, seted up a plurality of holes 31 of permeating water on the pipe wall of preceding dive collecting pipe 3, a plurality of holes 31 of permeating water specifically set up the position at middle coarse sand layer 2 place, and middle coarse sand layer 2 ponding gets into preceding dive collecting pipe 3 through the hole 31 of permeating water, and the working face is in anhydrous work state when guaranteeing tunnel construction, ensures construction safety.

In order to prevent silt from blocking the advanced submersible collecting pipe 3, a filter screen 32 is arranged at the position of the permeable hole 31 to block silt outside the advanced submersible collecting pipe 3.

The outer end of the advanced submersible collecting pipe 3 is externally leaked to the primary support structure layer 1 of the tunnel, the outer end of the advanced submersible collecting pipe 3 is connected with the drainage branch pipes 5 in a one-to-one correspondence mode, namely, each advanced submersible collecting pipe 3 is connected with the corresponding drainage branch pipe 5, and accumulated water entering the advanced submersible collecting pipe 3 is drained to the drainage branch pipe 5.

The number of the branch drain pipes 5 is plural, and the plural branch drain pipes 5 are connected to a common drain main 8, and the accumulated water in the respective branch drain pipes 5 is collected into the common drain main 8. The water outlet of the main drainage pipe 8 is connected with a water pump 9, and the water pump 9 provides the main power of horizontal precipitation in the tunnel to drain accumulated water in the main drainage pipe 8. It should be noted that the water pump 9 is a common component on the market.

The outlet of the water pump 9 corresponds to the water collecting tank 10, accumulated water pumped by the water pump 9 is discharged to the water collecting tank 10, enters the water in the water collecting tank 10 for precipitation, and the precipitated accumulated water is pumped and discharged to the municipal rainwater pipe network at regular time. In a specific embodiment, the water collection tank 10 may be formed by welding steel plates with a thickness of 20mm, the external dimension is 1.5m × 1.5m, the top of the water collection tank is open, and the outlet of the water pump 9 is arranged at the opening of the water collection tank 10.

The utility model provides a rich water sand bed tunnel construction level dewatering device is applicable to urban rail transit construction, in the underground excavation just prop up the structure work progress, increase horizontal dewatering device, take well head dewatering as the owner, horizontal dewatering device is assisted, finally reach the equilibrium point of supply and sluicing, drainage, groundwater control when realizing tunnel and passing rich water sand bed construction, reach the anhydrous operating condition in the underground excavation tunnel, be convenient for later stage waterproof and secondary lining construction, guaranteed construction quality, reduce the safety risk; the symptom of water leakage can be solved by one-time investment, and the investment of measure cost is greatly reduced; the hidden danger of water leakage is solved at one time by using the least investment of manpower and material resources, so that the later construction safety and quality are ensured, and the construction period of shallow-buried underground excavation construction is prolonged.

In addition to the above embodiment, the axial direction of the front submersible collecting pipe 3 is along the horizontal direction;

in the height direction, the advanced dive collection pipe 3 is provided with a plurality of layers.

In practical application, the installation setting direction of the advanced submersible collecting pipe 3 is horizontal to the axis direction, so that accumulated water can uniformly enter the advanced submersible collecting pipe 3.

Of course, the axial direction of the advanced submersible collecting pipe 3 is only a preferred embodiment along the horizontal direction, and is not exclusive, and the advanced submersible collecting pipe can also be slightly inclined upwards, and the angle is usually not more than 5 degrees, so that the water source is discharged outwards along the pipeline by means of the self gravity.

When the tunnel height is higher, when the ponding volume is great, set up the advanced dive collecting pipe 3 of multilayer along tunnel direction of height, for example the direction of height sets up 2 layers, and interval 1m sets up the one deck upwards from the tunnel bottom surface, and the direction of height interval sets up advanced dive collecting pipe 3, and 3 increase in quantity of advanced dive collecting pipe have increased displacement, more do benefit to the drainage, improve drainage efficiency.

In another more reliable embodiment, on the basis of any one of the above embodiments, a set distance is provided between the outer end water permeable holes 31 on the advanced submersible collecting pipes 3 and the inner wall of the tunnel primary support structure layer 1;

the depth of the advanced submersible collecting pipe 3 driven into the medium coarse sand layer 2 is greater than the set depth.

In practical application, have certain distance between preceding dive collecting pipe 3's outer end hole 31 of permeating water and the tunnel just props up the inner wall of structural layer 1, make outer end hole 31 of permeating water stretch into in the coarse sand layer 2 completely like this to prevent that outer end hole 31 of permeating water leaks gas and loses efficacy at the vacuum water absorption in-process, guarantee that outer end hole 31 of permeating water normally works.

For example, the distance between the outer end water permeable hole 31 of the advanced diving collecting pipe 3 and the inner wall of the primary support structure layer 1 of the tunnel can be set to 0.15m, the outer end water permeable hole 31 and the primary support structure layer 1 of the tunnel are ensured to have a certain distance, and the outer end air holes do not enter the primary support structure layer 1 of the tunnel and generate air leakage.

Furthermore, the depth of the advanced submersible collecting pipe 3 driven into the medium coarse sand layer 2 is greater than the set depth, so that accumulated water in the medium coarse sand layer 2 is discharged as far as possible. In the specific embodiment, the advanced diving collecting pipe 3 is made of a DN32 steel pipe with an outer diameter of 42.3mm, the total length of the advanced diving collecting pipe 3 is 2m, the hole position of the permeable hole 31 is 1.5m at the front end of the advanced diving collecting pipe 3, no hole is punched at 0.5m at the rear end of the advanced diving collecting pipe 3, vacuum water absorption and air leakage failure are prevented, the depth of the advanced diving collecting pipe 3 extending into the medium coarse sand layer 2 is 1.65m, and the tail end of the advanced diving collecting pipe 3 is 0.35m located in the tunnel primary support structure layer 1.

In another more reliable embodiment, on the basis of any one of the above embodiments, the advanced submersible collecting pipe 3 is internally plugged with a steel wire mesh at the position of the permeable hole 31.

In practical application, for preventing that silt from getting into leading dive collecting pipe 3 through the hole 31 of permeating water and then producing and blockking up, set up the wire net in hole 31 department of permeating water, wire net aperture size can filter silt and guarantee to permeate water normally simultaneously, for example choose for use wire net aperture size to be 800 meshes, can guarantee to permeate water hole 31 and normally work, prevents simultaneously that silt from getting into, and protection leading dive collecting pipe 3 can long-time unblocked operation.

In another more reliable embodiment, on the basis of any of the above embodiments, the water permeable holes 31 have a set spacing in the wall of the submersible collecting pipe 3;

the water permeable holes 31 are arranged in a quincunx shape on the pipe wall of the advanced submersible collecting pipe 3.

In practical application, the water permeable holes 31 on the pipe wall of the advanced diving collecting pipe 3 are arranged at intervals, and the pipe wall is usually perforated to form two water permeable holes 31, so that the water permeable holes 31 are easy to operate and process, and the manufacturing cost is low; the water permeable holes 31 on the pipe wall of the advanced submersible collecting pipe 3 are arranged in a quincunx shape, so that the water permeability of the pipe wall in all directions is increased, and the drainage efficiency is higher.

The interval of the permeable holes 31 on the pipe wall can be set to a specific value, for example, the length of the advanced submersible collecting pipe 3 is 2m, the interval distance of the permeable holes 31 is set to 0.1m, the interval density is moderate, and the drainage effect is good; the advanced diving collecting pipe 3 adopts the steel pipe that the external diameter is DN32, and 8mm can be chooseed for use to the diameter in the hole 31 of permeating water, and the hole 31 diameter of permeating water matches with 3 external diameters of advanced diving collecting pipe, guarantees that advanced diving collecting pipe 3 still has certain rigidity intensity structure behind the processing hole 31 of permeating water.

On the basis of the above embodiments, the front end of the advanced submersible collecting pipe 3 is in a sharp cone shape;

the front end of the advanced diving collecting pipe 3 is closed.

In practical application, in order to facilitate the advanced diving collecting pipe 3 to stretch into the medium-coarse sand layer 2, the front end of the advanced diving collecting pipe 3 is set into a pointed cone shape, the resistance of the front end of the advanced diving collecting pipe in the process of stretching into the medium-coarse sand layer 2 is smaller, and the operation of personnel is facilitated. Preferably, the advanced submersible collecting pipe 3 is a flower steel pipe, so that the processing is convenient, and the manufacturing cost is low.

The front end point awl links together through the welded mode with the steel pipe to form advanced dive collecting pipe 3's body structure, the weld forming is easy and simple to handle, and firm in connection cost is lower, and the form that adopts the full weld can guarantee that the front end of advanced dive collecting pipe 3 is the encapsulated situation, prevents that silt seepage from blockking up the pipeline drainage function.

In another more reliable embodiment, the advanced dive collection pipe 3 is connected to the branch drain pipe 5 by a 90-degree bend 4, in addition to any of the above-described embodiments.

In practical application, leading dive collecting pipe 3 is connected with drain branch 5 through 90 degrees elbows 4, and specifically speaking is 90 degrees elbows 4 and is connected with drain branch 5 down along the tunnel direction of height, and leading dive collecting pipe 3 passes through welded mode with 90 degrees elbows 4 to be connected, and the sound construction is easily operated.

The branch drain pipe 5 can be a steel pipe and is connected with the 90-degree elbow 4 in a welding mode; the branch drain pipe 5 can also be a PPR pipe, has light weight and low cost, is connected with the 90-degree elbow 4 in a hot melting mode at a hot melting point 7, and is easier to realize connection and manufacture in a tunnel.

On the basis of the above-described embodiments, the branch drain pipe 5 and the header drain pipe 8 are PPR pipes, and the branch drain pipe 5 and the header drain pipe 8 are connected by the three-way joint 6.

In practical application, the branch drain pipes 5 and the main drain pipe 8 are usually PPR pipes, and have the advantages of light weight, good strength, good corrosion resistance, long service life and low cost.

The branch drain pipe 5 is connected with the main drain pipe 8 through the three-way joint 6, the three-way joint 6 is a common structure and is generally used for the joint of the branch drain pipe 5 and the main drain pipe 8, the joint is sealed and fixed in a hot melting connection mode, the operation is simple and convenient, the connection is firm, the service life is long, and the maintenance cost is low.

On the basis of the above embodiments, the main drainage pipe 8 is disposed at the bottom of the primary support structure layer 1 of the tunnel, the main drainage pipe 8 is disposed along the horizontal direction, and the branch drainage pipe 5 is disposed along the vertical direction.

In practical application, the main drainage pipe 8 is placed at the bottom of the primary support structure layer 1 of the tunnel and is placed horizontally along the length direction of the tunnel, so that accumulated water can be conveniently led out of the tunnel along the main drainage pipe 8; the drain branch pipe 5 is placed along the vertical direction of the tunnel height direction, plays the role of connecting the advanced diving collection pipe 3 with the drain main pipe 8, and the accumulated water in the advanced diving collection pipe 3 flows into the drain main pipe 8 through the drain branch pipe 5 under the action of self gravity, thereby playing the role of automatic drainage.

In another more reliable embodiment, on the basis of any one of the above embodiments, a holding groove is formed in the outer wall of the tunnel primary support structure layer 1, and the drainage branch pipes 5 and the drainage header pipe 8 are placed in the holding groove.

In practical application, drainage branch pipe 5 and drain main 8 accessible are buried the form and are placed, set up the holding tank in the outer wall of tunnel primary structure layer 1 and tunnel bottom, place drainage branch pipe 5 and drain main 8 and lay in the holding tank, set up like this and can increase the tunnel inner space, play the effect of protection to drainage branch pipe 5 and drain main 8 simultaneously.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

It is right above the utility model provides a rich water sand bed tunnel construction level precipitation device has carried out the detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the scope of the appended claims. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a rich water sand layer tunnel construction level precipitation device, its characterized in that includes from tunnel just a structural layer (1) squeeze into coarse sand layer (2) and along a plurality of advanced dive collecting pipe (3) that tunnel length direction interval set up, respectively with every a plurality of drainage branch pipe (5), water inlet and a plurality of that the outer end of advanced dive collecting pipe (3) is connected drainage main (8), import that drainage branch pipe (5) all communicate with water pump (9) that the delivery port of drainage main (8) is connected, with exit linkage's of water pump (9) catch bowl (10), the pipe wall of advanced dive collecting pipe (3) is in a plurality of holes (31) of permeating water have been seted up in the position at coarse sand layer (2) place, advanced dive collecting pipe (3) are provided with filter screen (32) in hole (31) department of permeating water.

2. The horizontal precipitation device for the water-rich sand layer tunnel construction according to claim 1, wherein the axial direction of the advanced submerged collecting pipe (3) is along the horizontal direction;

in the height direction, the advanced diving collection pipe (3) is provided with a plurality of layers.

3. The horizontal precipitation device for the tunnel construction of the water-rich sand layer according to claim 1, wherein a set distance is reserved between an outer end water permeable hole (31) on the advanced diving collecting pipe (3) and the inner wall of the primary support structure layer (1) of the tunnel;

the depth of the advanced submersible collecting pipe (3) driven into the medium coarse sand layer (2) is greater than the set depth.

4. The horizontal precipitation device for the water-rich sand layer tunnel construction according to claim 1, wherein the advanced submersible collecting pipe (3) is internally plugged with a steel wire mesh at the position of the permeable hole (31).

5. The horizontal precipitation device for the water-rich sand layer tunnel construction according to claim 1, wherein the water permeable holes (31) have set intervals on the pipe wall of the advanced submerged collecting pipe (3);

the water permeable holes (31) are arranged on the pipe wall of the advanced diving collecting pipe (3) in a quincunx shape.

6. The horizontal precipitation device for the water-rich sand layer tunnel construction according to claim 1, wherein the front end of the advanced submersible collecting pipe (3) is in a pointed cone shape;

the front end of the advanced diving collecting pipe (3) is closed.

7. The horizontal precipitation device for the water-rich sand layer tunnel construction according to claim 1, wherein the advanced diving collection pipe (3) is connected with the branch drainage pipe (5) through a 90-degree elbow (4).

8. The horizontal dewatering device for the water-rich sand layer tunnel construction according to claim 7, characterized in that the branch drain pipe (5) and the main drain pipe (8) are PPR pipes, and the branch drain pipe (5) and the main drain pipe (8) are connected through a tee joint (6).

9. The horizontal precipitation device for the water-rich sand layer tunnel construction according to claim 8, wherein the main drainage pipe (8) is arranged at the bottom of the primary support structure layer (1) of the tunnel, the main drainage pipe (8) is arranged in the horizontal direction, and the branch drainage pipe (5) is arranged in the vertical direction.

10. The horizontal precipitation device for the water-rich sand layer tunnel construction according to any one of claims 1 to 9, wherein a holding tank is formed on the outer wall of the primary support structure layer (1) of the tunnel, and the branch drain pipes (5) and the main drain pipe (8) are placed in the holding tank.

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