CN114541445A

CN114541445A - Construction method of drain hole

Info

Publication number: CN114541445A
Application number: CN202210166720.XA
Authority: CN
Inventors: 葛寨辉; 陈占; 俞添; 彭志鹏; 陈侃; 赵海粟; 何新辉; 郭睿; 朱江江; 房军
Original assignee: China Railway Siyuan Survey and Design Group Co Ltd; China Railway Siyuan Group Engineering Construction Co Ltd
Current assignee: China Railway Siyuan Survey and Design Group Co Ltd; China Railway Siyuan Group Engineering Construction Co Ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-05-27

Abstract

The invention provides a construction method of a drain hole, which comprises the following steps: lofting the slope surface, and obtaining a drainage space with a preset depth through a drilling machine; inserting a first pipe with water seepage holes into the drainage space to form a drainage pipeline; and inserting a second pipe filled with filler into the drainage pipeline to obtain the drainage hole, wherein the second pipe is a water-permeable hose, and the filler can permeate water. The first pipe and the second pipe are arranged to prevent the drain hole from collapsing, and drainage efficiency is improved.

Description

Construction method of drain hole

Technical Field

The invention relates to the field of drainage construction, in particular to a construction method of a drain hole.

Background

In order to effectively drain underground water of a slope body, reduce the water pressure and the water content of the slope body, improve the effective stress of the slope body, promote drainage consolidation of the slope body and the like, the inclined drain holes are common underground water drainage engineering measures in engineering, the inclined drain holes can quickly drain the underground water, improve the shear strength of a rock body, prevent side slope instability, reduce excavation of the rock body, accelerate engineering progress and reduce manufacturing cost, and the related inclined drain holes are easy to collapse, so that the problems of short service life and poor drainage effect of the drain holes are caused.

Disclosure of Invention

The invention provides a construction method of a drain hole, which aims to solve the problems of short service life and poor drainage effect caused by the collapse of the drain hole.

The embodiment of the invention provides a construction method of a drain hole, which comprises the following steps: lofting the slope surface, and obtaining a drainage space with a preset depth through a drilling machine; inserting a first pipe with water seepage holes into the drainage space to form a drainage pipeline; and inserting a second pipe filled with filler into the drainage pipeline to obtain the drainage hole, wherein the second pipe is a water-permeable hose, and the filler can permeate water.

Further, the inserting the second pipe filled with the filler into the drainage pipe to obtain the drainage hole includes: and inserting a second pipe filled with filler into the drainage pipeline to form clearance fit between the second pipe and the first pipe.

Further, the construction method includes the steps of inserting a first pipe with water seepage holes into the drainage space to form a drainage pipeline and inserting a second pipe filled with filler into the drainage pipeline to form clearance fit between the second pipe and the first pipe, and the construction method further includes: and wrapping the outer wall of the second pipe with geotextile.

Further, said inserting a second pipe filled with a filler into said drain pipe, obtaining a drain hole comprises: and inserting the second pipe filled with coarse sand into the drainage pipeline to obtain the drainage hole.

Further, lofting the slope surface, and obtaining a drainage space with a preset depth through a drilling machine comprise: and drilling by adopting an auger to obtain a drainage space with a preset depth.

Further, the inserting the first pipe having the water seepage hole into the drain space to form the drain pipe includes: and attaching the first pipe to a wall surface of the drainage space.

Furthermore, a connecting sleeve is arranged between every two adjacent first pipes; said inserting a first pipe having a weep hole into said drain space to form a drain pipe comprising: and attaching the inner wall of the connecting sleeve to the first pipe.

Further, the construction method further includes the steps of inserting a first pipe with water seepage holes into the drainage space to form a drainage pipe and inserting a second pipe filled with filler into the drainage pipe to obtain a space between the drainage holes: and (4) extending the air pipe into the drainage pipeline to discharge soil in the drainage pipeline out of the drainage pipeline.

Further, after the second pipe filled with the filler is inserted into the drainage pipe to obtain a drainage hole, the construction method further includes: and a one-way valve is arranged at the orifice of the drain hole.

Further, the inserting the first pipe having the water seepage hole into the drain space to form the drain pipe includes: extending a portion of the first tube beyond the ramp.

The construction method of the drain hole provided by the embodiment of the invention is characterized in that a first pipe with a water seepage hole and a second pipe filled with filler are arranged, the second pipe is placed in the first pipe, the second pipe and the filler in the second pipe can realize the water seepage function, the second pipe is a hose, when a roadbed slope body extrudes the first pipe, the first pipe can be effectively supported through the second pipe filled with the filler, so that the collapse of the drain hole is prevented, the problem of short service life of the drain hole is solved, meanwhile, water of the roadbed slope body can flow into a drainage pipeline through the water seepage hole of the first pipe, under the action of the second pipe filled with the filler, the problem of blockage caused by the fact that muck enters the drainage pipeline along with the water can be prevented, and therefore, the second pipe filled with the filler can play a role of filtering, the problem of poor drainage effect is solved, and the drainage efficiency is improved.

Drawings

Fig. 1 is a schematic flow chart of a construction method of a drain hole according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart illustrating a method for constructing a drain hole according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart illustrating a method for constructing a drain hole according to an embodiment of the present invention;

FIG. 4 is a schematic flow chart illustrating a method for constructing a drain hole according to an embodiment of the present invention;

FIG. 5 is a schematic flow chart illustrating a method for constructing a drain hole according to an embodiment of the present invention;

FIG. 6 is a schematic view of a hole drilled in a drain hole according to an embodiment of the present invention;

FIG. 7 is a schematic flow chart illustrating a method for constructing a drain hole according to an embodiment of the present invention;

FIG. 8 is a schematic flow chart illustrating a method for constructing a drain hole according to an embodiment of the present invention;

FIG. 9 is a schematic flow chart illustrating a method for constructing a drain hole according to an embodiment of the present invention;

FIG. 10 is a schematic flow chart illustrating a method for constructing a drain hole according to an embodiment of the present invention;

FIG. 11 is a schematic cross-sectional view of a check valve of a drain hole according to an embodiment of the present invention;

FIG. 12 is a schematic view of a check valve of a drain hole according to an embodiment of the present invention;

FIG. 13 is a schematic flow chart illustrating a method for constructing a drain hole according to an embodiment of the present invention;

fig. 14 is a schematic cross-sectional view of a drainage hole according to an embodiment of the present invention.

Description of the reference numerals

10. PVC pipes; 11. PVC pipe water seepage holes; 20. geotextile; 30. RCP network management; 40. coarse sand; 50. a one-way valve; 51. an outer tube of the one-way valve; 52. a one-way valve fixing baffle; 53. a one-way valve movable baffle; 54. a movable baffle rotating shaft; 55. a water outlet of the one-way valve; 60. a screw drill; 70. and (5) a roadbed slope body.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The individual features described in the embodiments can be combined in any suitable manner without departing from the scope, for example different embodiments and aspects can be formed by combining different features. In order to avoid unnecessary repetition, various possible combinations of the specific features of the invention will not be described further.

In the following description, the term "first/second/so" is used merely to distinguish different objects and does not mean that there is a common or relationship between the objects. It should be understood that the description of the "upper", "lower", "outer" and "inner" directions as related to the orientation in the normal use state, and the "left" and "right" directions indicate the left and right directions indicated in the corresponding schematic drawings, and may or may not be the left and right directions in the normal use state.

It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The term "coupled", where not otherwise specified, includes both direct and indirect connections.

The construction method of the drain hole provided in the concrete real-time mode is suitable for the construction of the drain hole on any roadbed and a slope near the roadbed, and is also suitable for the construction of the drain hole on the roadbed of an operation railway. Illustratively, the construction method of the drain hole is suitable for constructing the drain hole on the surface of the highway subgrade; illustratively, the construction method of the drain hole is suitable for constructing the drain hole on the surface of a side slope near a railway roadbed; illustratively, the construction method of the drain hole is suitable for constructing the drain hole on the surface of the operation railway roadbed. For convenience of explanation, the construction method is used for constructing the drainage hole on the surface of the operation railway roadbed.

Referring to fig. 1, fig. 1 is a schematic flow chart of a construction method of a drainage hole according to an embodiment of the present invention, as shown in fig. 1, the flow chart of the construction method includes:

and step S1, lofting the slope surface, and obtaining a drainage space with a preset depth through a drilling machine.

Firstly, measurement lofting is carried out in the skylight period of an operating railway, and the construction position should avoid railway equipment such as pipes, lines and the like. And (4) measuring the position of the drain hole on the slope of the operation railway subgrade according to a drawing by constructors, and marking by using a wooden pile for example.

And secondly, a drilling machine operation platform is built, so that the drilling machine is convenient for constructors to operate. The drilling machine is installed on the drilling machine operation platform, the working angle of the drilling machine is adjusted, in the construction of the inclined drain hole, the inclination angle range of the drilling hole of the related embodiment is between 4 degrees and 12 degrees, the specific inclined angle can be determined according to the actual situation on site, the specific inclination angle is not limited, after the inclination angle of the drilling machine is adjusted, the drilling machine is fixed on the drilling machine operation platform, and the drilling machine is prevented from shaking, so that the inclination angle is prevented from being changed. The drilling machine includes a down-the-hole drilling machine and an auger drilling machine, and in this embodiment, an auger drilling machine may be preferred, and specific details will be described in detail below.

Finally, drilling is started after the inclination angle of the drilling machine is fixed, in the construction of the inclined drain hole, the diameter range of the drill hole of the related embodiment is between 80 millimeters and 120 millimeters, the specific diameter of the drill hole can be determined according to the actual situation on site, in order to prevent great disturbance to the roadbed in the drilling process, the drill hole can be slowly drilled, the drilling speed is related to the quality of the roadbed soil body, the specific drilling speed can be determined according to the actual soil body situation, and the muck in the hole can be timely removed in the drilling process. The specific drilling depth is determined according to the local actual water-bearing stratum depth, the specific depth is not limited, the preset depth can be understood as the drilling depth of the drilling machine determined according to the local actual water-bearing stratum depth and the roadbed width, and when the drilling of the drilling machine reaches the preset depth, the drainage space is obtained.

And step S2, inserting the first pipe with the water seepage holes into the drainage space to form a drainage pipeline.

Specifically, a first pipe with a water seepage hole is inserted into a drainage space to form a drainage pipeline, the first pipe does not need to be spliced under the condition that the length of a single first pipe meets the depth of the drainage space, and the diameter of the first pipe is the same as that of a drilled hole; under the condition that the length of single first pipe can not satisfy drainage space degree of depth, first pipe need splice, for the convenience of subsequent installation second pipe, then first pipe adopts the mode of outside of tubes concatenation, link together many first union couplings through the outer adapter sleeve, the outer adapter sleeve can transition fit with first pipe, the diameter of first pipe at this moment slightly is lighter than drilling diameter, for example the diameter of first pipe can be less than between drilling diameter 5 millimeters to 10 millimeters, concrete numerical value can be according to actual conditions, here is reference value only. The first pipe is a rigid pipe, and can be understood as a pipe which cannot be deformed or can be deformed only slightly, such as a steel pipe and a PVC pipe (polyvinyl chloride pipes, hereinafter, PVC pipes are all polyvinyl chloride pipes). Illustratively, the first pipe is a PVC pipe, and in order to ensure a certain supporting force of the PVC pipe, the wall thickness of the PVC pipe may be selected to be greater than 3 mm, and the specific wall thickness may be determined according to actual conditions. In order to realize the function of drainage, a water seepage hole needs to be arranged on the first pipe, the water seepage hole can be arranged on the upper portion of the first pipe, the diameter size data and the position of the water seepage hole are used as references of the embodiment, the arrangement of the specific water seepage hole can be set according to actual conditions, for example, 4 rows of water seepage holes are arranged in a 240-degree range on the upper portion of the first pipe, the aperture of the water seepage hole can be between 4 millimeters and 8 millimeters, in the circumferential direction of the first pipe, the included angle between two adjacent water seepage holes is 80 degrees, the water seepage hole is not arranged in a 120-degree range on the lower portion of the first pipe, so that the water is smoothly discharged from the water drainage hole, the first pipe can be flush with the slope surface of the roadbed relative to the slope surface of the roadbed, and can also exceed the slope surface of the roadbed, so that the drainage is convenient.

And step S3, inserting a second pipe filled with filler into the drainage pipeline to obtain the drainage hole, wherein the second pipe is a water-permeable hose, and the filler can permeate water.

Specifically, insert the first pipe that has the infiltration hole in the drainage space, form drainage pipe, when installing first pipe, first pipe and the wall contact in drainage space, there is the condition that the dregs of wall fall into first intraductal, need get out of the pipe with the dregs in first pipe, insert the drainage pipe with the second pipe that is full of the filler, obtain the wash port, wherein, the second pipe is the hose that can permeate water. The filler is understood here to mean any substance which can act as a support for the pipe to filter out water, for example a fine sand mixture, coarse sand. The term "filling" is understood to mean that the filler is filled into the second pipe until the second pipe can no longer contain the filler, and the second pipe is filled with the sand-stone mixture until the second pipe can no longer contain the sand-stone mixture, and the second pipe filled with the sand-stone mixture is inserted into the drainage pipeline, so that the second pipe can be easily installed and replaced, and the second pipe can support the first pipe when the first pipe is slightly deformed, and is provided as a hose, so that the second pipe can be a water permeable hose, such as a plastic hose with a water seepage hole, an RCP net pipe (plastic pipes made of polypropylene and composites thereof, and hereinafter, the RCP net pipe is a plastic pipe made of polypropylene and composites thereof), exemplarily, the second pipe is an RCP net pipe, the RCP net pipe is filled with coarse sand, both ends of the RCP net pipe are fastened, and the RCP net pipe filled with the coarse sand is inserted into the drainage pipeline, a drain hole is obtained.

In some embodiments, as shown in fig. 2, fig. 2 is a schematic flow chart of a construction method of a drainage hole according to an embodiment of the present invention, and based on fig. 1, step S3 in fig. 2 includes:

and step S31, inserting the second pipe filled with the filler into the drainage pipeline to form clearance fit between the second pipe and the first pipe.

In some embodiments, after the drain hole is operated for a period of time, there is a situation that the second pipe is blocked due to the fact that the muck is adsorbed on the pipe wall of the second pipe through the water seepage hole of the first pipe, so that the drainage efficiency of the second pipe is reduced, and the second pipe needs to be replaced in time in order to enable the second pipe to be in a good drainage state. In order to facilitate installation and replacement of the second pipe, clearance fit can be formed between the second pipe and the first pipe, a clearance is reserved between the first pipe and the second pipe under temporary support of the first pipe, friction force between the first pipe and the second pipe is small, and even if the condition of residue soil blockage exists, the clearance between the first pipe and the second pipe can facilitate replacement of the second pipe. The gap between the first pipe and the second pipe is not easy to be too large, the first pipe can deform under the pressure action of a roadbed soil body, the inner wall surface of the first pipe is in contact with the second pipe, the second pipe supports the first pipe to prevent the first pipe from further deforming to cause damage, case data are only used as reference, no body data are given, the specific data are subject to actual field conditions, illustratively, the first pipe is a PVC pipe, the second pipe is an RCP pipe network, the diameter of the RCP pipe network is 6-10 mm smaller than the inner diameter of the PVC pipe, the RCP pipe network can be quickly replaced under temporary support of the PVC pipe, the PVC pipe deforms under extrusion of the roadbed soil body, the RCP can support the PVC pipe network, and the PVC pipe is prevented from exceeding elastic deformation to cause damage, so that a drain hole is collapsed.

In some embodiments, as shown in fig. 3, fig. 3 is a schematic flow chart of a construction method of a drainage hole according to an embodiment of the present invention, and based on fig. 2, the steps in fig. 3 further include:

and step S4, wrapping the outer wall of the second pipe with geotextile.

In some embodiments, in order to prolong the service life of the second pipe and reduce the replacement frequency of the second pipe, thereby reducing the maintenance cost in the later construction period of the drain hole, a construction step of wrapping a layer of geotextile on the outer wall of the second pipe is added in which the first pipe with a water seepage hole is inserted into the drain space to form a drain pipe and the second pipe filled with filler is inserted into the drain pipe to form a clearance fit between the second pipe and the first pipe, the geotextile can effectively prevent muck of roadbed soil from blocking the water seepage hole of the second pipe, thereby affecting the drainage efficiency of the second pipe, in order to prevent the geotextile from moving on the outer wall of the second pipe, the geotextile can be tied on the second pipe by using tying wires, the number of the tying wires and the density of the tying wires can be determined according to the actual situation, reference is provided only in the following cases, exemplarily, the second pipe is an RCP pipe, and the geotextile is tied on the RCP pipe by using tying wires, the spacing distance of the binding wires is 0.5-1 m, and two ends of the RCP net pipe are wrapped by the geotextile and are tightly bound by the binding wires, so that the geotextile is prevented from moving in the drainage channel.

In some embodiments, as shown in fig. 4, fig. 4 is a schematic flow chart of a construction method of a drainage hole according to an embodiment of the present invention, and based on fig. 1, step S3 in fig. 4 further includes:

and step S32, inserting the second pipe filled with the coarse sand into a drainage pipeline to obtain a drainage hole.

In some embodiments, coarse sand is preferred as the filler, the coarse sand particles have a larger volume than fine sand, and if fine sand is selected as the filler, although the fine sand can be effectively prevented from flowing out of the second pipe under the action of water in the drainage channel by adding geotextile to wrap the outer wall of the second pipe, the fine sand has poor permeability and slow water permeability, and when the drainage requirement is large, the permeability and filtration efficiency of the fine sand cannot meet the requirement of the drainage hole. (ii) a If chooseing for use the pebble as the filler, the pebble can not flow from the infiltration hole of second pipe along with water, nevertheless can have the space between the pebble, and the subgrade takes place slight vibration at the railway operation in-process and leads to the pebble to take place to rock in the second pipe, and the space between the pebble can reduce to lead to the change of the volume of whole second pipe, for example, the pebble can be inseparabler, and the second pipe can not give the effectual support of first pipe with the clearance grow of first pipe, second pipe. Meanwhile, the small stones have sharp ends, so that the structure of the second pipe is easily damaged when the small stones are filled, and therefore, relatively speaking, coarse sand is preferably used as the filler.

In some embodiments, as shown in fig. 5, fig. 5 is a schematic flow chart of a construction method of a drainage hole according to an embodiment of the present invention, and based on fig. 1, step S1 in fig. 5 includes:

and step S11, drilling by adopting an auger to obtain a drainage space with a preset depth.

In some embodiments, the drainage space with the preset depth drilled by the drilling machine can be preferably drilled by adopting an auger drill, and the disturbance of the drilled hole to the roadbed filling material can be reduced by the auger drill in the drilling process, so that the danger of operating railways caused by settlement of the roadbed of the operating railways in the drilling process is avoided. The related construction method utilizes a down-the-hole drill to adopt high-pressure wind as drilling power, the down-the-hole drill impacts surrounding rocks through a down-the-hole drill bit during drilling, rock and soil mass fragments are blown out of the drilled holes, the high-pressure wind can generate large disturbance on roadbed filling materials, particularly roadbed with gaps can be influenced, roadbed settlement is easy to cause, and the construction of an operation railway is not suitable.

In which an auger is used to drill a hole, and an embodiment of the present invention further provides a drilling view of a drain hole, as shown in fig. 6, the auger 60 is installed on a roadbed slope body 70, a slant angle is set, the auger 60 is fixed, and the auger 60 is manually operated to drill a hole.

In some embodiments, as shown in fig. 7, fig. 7 is a schematic flowchart of a construction method of a drainage hole according to an embodiment of the present invention, and based on fig. 5, step S2 in fig. 7 includes:

in step S21, the first pipe is attached to the wall surface of the drainage space.

In some embodiments, the first pipe is attached to the wall surface of the drainage space, which can be understood as that the first pipe is closely attached to the roadbed filling material, no gap exists between the first pipe and the roadbed filling material, and the first pipe forms an effective support for the roadbed filling material, so that the later deformation of the roadbed and the first pipe is avoided. Exemplarily, the first pipe is a PVC pipe, after the auger drills to obtain a drainage space with a preset depth, the PVC pipe with the same diameter as the drilled hole is inserted into the drainage space, the PVC pipe is attached to the wall surface of the drainage space, no gap exists between the PVC pipe and the wall surface of the drainage space, the PVC pipe can effectively support a roadbed soil body, and the roadbed is not prone to settlement.

In some embodiments, as shown in fig. 8, fig. 8 is a schematic flow chart of a construction method of a drainage hole according to an embodiment of the present invention, and based on fig. 1, step S2 in fig. 8 further includes:

and step S22, attaching the inner wall of the connecting sleeve to the first pipe.

In some embodiments, the width of the aquifer of the roadbed soil body is large, so that the first pipes need to be spliced and extended, and the splicing number of the first pipes is determined according to the actual depth of the aquifer of the roadbed soil body. In order to be convenient for subsequently replacing the second pipe, an outside-pipe splicing mode is preferably adopted, the plurality of first pipes are connected together through the outside connecting sleeve, in order to prevent water from permeating into a roadbed soil body from the splicing position of the first pipes, the inner wall of the connecting sleeve is attached to the first pipes, and the attachment of the connecting sleeve can be understood that the outer diameter of the first pipes is equal to the inner diameter of the connecting sleeve. Illustratively, the first pipe is a PVC pipe, two ends of the connection sleeve are respectively connected with the two PVC pipes, the diameter of the PVC pipe is 100 mm, the inner diameter of the connection sleeve is 100 mm, and the PVC pipe is tightly attached to the connection sleeve.

In some embodiments, as shown in fig. 9, fig. 9 is a schematic flow chart of a construction method of a drainage hole according to an embodiment of the present invention, and based on fig. 1, the steps in fig. 9 further include:

and step S5, the air pipe is extended into the drainage pipeline to discharge the mud in the drainage pipeline.

In some embodiments, in order to install the second pipe conveniently, the first pipe needs to be cleaned after the first pipe is installed, the second pipe is prevented from being installed due to the fact that the first pipe with the water seepage holes is inserted into the drainage space, the drainage pipeline is formed, the second pipe filled with the filler is inserted into the drainage pipeline, the space between the drainage holes is obtained, the air pipe extends into the drainage pipeline, and soil in the drainage pipeline is drained. Here, the air pipe is any pipe capable of blowing air, illustratively, the first pipe is a PVC pipe, the second pipe is an RCP net pipe, after the PVC pipe is inserted into the drainage space to form the drainage pipe, the air pipe is infiltrated into the PVC pipe, the soil in the pipe is removed from the pipe, and then the RCP net pipe is inserted into the PVC pipe.

In some embodiments, as shown in fig. 10, fig. 10 is a schematic flow chart of a construction method of a drainage hole according to an embodiment of the present invention, and based on fig. 1, the steps in fig. 10 further include:

step S6, a check valve is installed at the orifice of the drain hole.

In some embodiments, when the operation railway roadbed is at a low-lying place or near a river, rainwater or river water is easy to flow back into the drain hole in rainy season, after the second pipe filled with the filler is inserted into the drainage pipeline to obtain the drain hole, a one-way valve is installed at the orifice of the drain hole to prevent rainwater or river water from flowing into the drain hole, any one-way valve capable of preventing backflow meets the requirements of the case, for example, the one-way valve can be a metal one-way grout stopping device, or a PPR pipe (polypropylene pipe, hereinafter, all the PPR pipes are polypropylene pipes) can be used as the one-way valve, different selection methods are provided according to different actual environments, for example, in a humid environment, the metal one-way grout stopping device is easy to corrode to influence the construction effect, preferably the PPR pipe is used as the one-way valve, and is corrosion-resistant, low in cost and convenient to construct, can effectively avoid rainwater from flowing backwards and keep the roadbed stable.

Wherein, a PPR pipe is used as the check valve, and an embodiment of the present invention further provides a structural schematic diagram of the check valve, as shown in fig. 11 and 12, the check valve 50 includes: the check valve comprises a check valve outer pipe 51, a check valve fixed baffle 52, a check valve movable baffle 53, a movable baffle rotating shaft 54 and a check valve water outlet 55. The one-way valve outer tube 51 is sleeved on the PVC tube 10, a one-way valve fixed baffle 52, a one-way valve movable baffle 53 and a movable baffle rotating shaft 54 are arranged in the tube, the one-way valve movable baffle 53 rotates around the movable baffle rotating shaft 54 and is blocked by the one-way valve fixed baffle 52, the one-way valve movable baffle 53 can only rotate towards the outer part of the drain hole, and one-way water outlet of the PVC tube 10 through the one-way valve water outlet hole 55 is realized.

In some embodiments, as shown in fig. 13, fig. 13 is a schematic flowchart of a construction method of a drainage hole according to an embodiment of the present invention, and based on fig. 1, step S2 in fig. 13 further includes:

step S23, extending a portion of the first tube out of the ramp.

In some embodiments, in order to prevent the water flowing out through the drainage channel from flowing into the roadbed soil again, a part of the first pipe may extend out of the slope surface, where it is described that the part of the first pipe extends out of the slope surface is on the premise of affecting drainage of the drainage hole, it may be understood that one end of the first pipe extends into the bottom of the drainage space, and the other end of the first pipe extends out of the slope surface, and when the length of a single first pipe does not meet the requirement, the first pipe may be spliced by a connection sleeve, the first pipes are connected to form a long pipe, and at this time, one end of the long pipe extends into the bottom of the drainage space, and the other end of the long pipe extends out of the slope surface. The specific actual length of the extending slope surface is related to the angle of the roadbed slope surface, and can be determined according to actual conditions, and only an exemplary reference is given here, illustratively, the first pipe is a PVC pipe, one end of the PVC pipe extends into the bottom of the drainage space, the other end of the PVC pipe extends out of the roadbed slope surface, and the length of the extending slope surface of the roadbed can be 5 cm-10 cm.

In some embodiments, the present invention further provides a schematic cross-sectional view of an oblique drainage hole, as shown in fig. 14, the drainage hole includes: PVC pipe 10, PVC pipe infiltration hole 11, geotechnical cloth 20, RCP net pipe 30, coarse sand 40.

Specifically, PVC pipe 10 closely laminates with the road bed soil body, the diameter of PVC pipe 10 is 100 millimeters, the wall thickness of PVC pipe 10 is 5 millimeters, PVC pipe 10 upper portion 240 degrees scope is provided with 4 rows of PVC pipe infiltration holes 11, every PVC pipe infiltration hole 11 aperture is 6 millimeters, the contained angle between two adjacent infiltration holes is 80 degrees, the diameter of RCP network management 30 is 80 millimeters, RCP network management 30's outer wall parcel has geotechnological cloth 20, RCP network management 30's inside is full of coarse sand 40.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A construction method of a drain hole is characterized by comprising the following steps:

lofting the slope surface, and obtaining a drainage space with a preset depth through a drilling machine;

inserting a first pipe with water seepage holes into the drainage space to form a drainage pipeline;

and inserting a second pipe filled with filler into the drainage pipeline to obtain the drainage hole, wherein the second pipe is a water-permeable hose, and the filler can permeate water.

2. The construction method according to claim 1, wherein said inserting a second pipe filled with a filler into said drainage pipe to obtain a drainage hole comprises:

and inserting a second pipe filled with filler into the drainage pipeline to form clearance fit between the second pipe and the first pipe.

3. The construction method according to claim 2, wherein the construction method further comprises, after the first pipe having the water penetration hole is inserted into the drainage space to form a drainage pipe and the second pipe filled with the filler is inserted into the drainage pipe so that a clearance fit is formed between the second pipe and the first pipe:

and wrapping the outer wall of the second pipe with geotextile.

4. The construction method according to claim 1, wherein said inserting a second pipe filled with a filler into said drainage pipe to obtain a drainage hole comprises:

and inserting the second pipe filled with coarse sand into the drainage pipeline to obtain the drainage hole.

5. The construction method according to claim 1, wherein the lofting of the slope surface to obtain the drainage space with a preset depth by a drilling machine comprises:

and drilling by adopting an auger to obtain a drainage space with a preset depth.

6. The construction method according to claim 1 or 5, wherein the inserting the first pipe having the water seepage hole into the drainage space to form a drainage pipeline comprises:

and attaching the first pipe to a wall surface of the drainage space.

7. The construction method according to claim 1, wherein a connecting sleeve is arranged between two adjacent first pipes;

said inserting a first pipe having a weep hole into said drain space to form a drain pipe comprising:

and attaching the inner wall of the connecting sleeve to the first pipe.

8. The construction method according to claim 1, wherein the construction method further comprises, after the first pipe having the weep holes is inserted into the drain space to form a drain pipe and the second pipe filled with the filler is inserted into the drain pipe to obtain the drain holes:

and (4) extending the air pipe into the drainage pipeline to discharge soil in the drainage pipeline out of the drainage pipeline.

9. The construction method according to claim 1, wherein after said inserting the second pipe filled with the filler into the drainage pipeline to obtain the drainage hole, the construction method further comprises:

and a one-way valve is arranged at the orifice of the drain hole.

10. The construction method according to claim 1, wherein the inserting the first pipe having the weep hole into the drain space to form a drain pipe comprises:

extending a portion of the first tube beyond the ramp.