WO2017217290A1

WO2017217290A1 - Drain pipe and manufacturing method for same

Info

Publication number: WO2017217290A1
Application number: PCT/JP2017/021071
Authority: WO
Inventors: 敏孝清水
Original assignee: メインマーク・アクアテック株式会社
Priority date: 2016-06-15
Filing date: 2017-06-07
Publication date: 2017-12-21
Also published as: CN109415881A; JP2017223050A; JP6162290B1

Abstract

A water permeable drain pipe comprising a three-dimensional mesh structure, a filter material that covers the outer circumferential face of the three-dimensional mesh structure, and netting that covers the outer circumferential face of the filter material, wherein the drain pipe comprises a first bonded portion where the outer circumferential face of the filter material and the inner circumferential face of the netting are bonded by thermofusion, and a second bonded portion where the outer circumferential face of the three-dimensional mesh structure and the inner circumferential face of the filter material are bonded by thermofusion.

Description

Drain tube and manufacturing method thereof

The present invention relates to a drain pipe used in a non-open-drain drain pipe burying method that can be used in a ground water level lowering method that prevents ground liquefaction by draining ground water in a shallow portion of the ground and lowering the ground water level, and a method for manufacturing the drain pipe.

When a large earthquake occurs, liquefaction occurs in the sandy ground, and as a result, the lifeline may be interrupted, structures may be sunk and collapsed.
In recent years, in order to prevent this liquefaction, the groundwater level is reduced by lowering the groundwater in the shallow part of the ground, the thickness of the non-liquefied layer is increased, and the restraint pressure on the liquefied layer deeper than the groundwater level is increased to increase the liquidity. The groundwater level lowering method that suppresses the conversion is attracting attention.
In order to lower the groundwater level, a porous drain pipe is generally buried in the ground, and underground rainwater and spring water are collected in the drain pipe and discharged.

As a method of burying a drain pipe in the ground, there is a construction method in which a drain pipe is inserted into a sheath pipe buried by a propulsion method or the like, and then the sheath pipe is pulled out to leave the drain pipe. As this drain pipe, there is one in which a three-dimensional network structure of a thermoplastic resin such as polypropylene is formed on a cylindrical wall. By using such a drain pipe, it is possible to withstand a pressure due to a considerable covering thickness.

In this drain pipe, the outer peripheral surface of the three-dimensional network structure is covered with a filter material, and the outer peripheral surface is further covered with a net. The filter material is employed in order to prevent the water permeability from being impeded by sand clogging immediately into the drain pipe buried in the ground and clogging.
The mesh body is employed to prevent the filter material from being turned up and compressed by friction with the inner surface of the sheath tube when the drain tube is inserted into the sheath tube.

In order to cover the filter material and the mesh body, the filter material and the mesh body must be fixed to the three-dimensional network structure. For this fixing, a filter material and a mesh body are wound around the outer peripheral surface of the three-dimensional network structure in order, and then a method of winding and fastening a vinyl tape or the like or a method of winding and tightening a band or string (a method using a fixing member). Done. Moreover, the method of fixing with an adhesive agent is also performed.
In addition, after fixing both the filter material and the net | network material, the method of fixing a net | network material after fixing a filter material is also performed suitably.

JP 2017-2641 A

In the fixing method using vinyl tape or band, there is a convex part with vinyl tape or band on the surface, and it may be caught by the sheath tube, and the adhesive part may stick to the sheath tube with vinyl tape. . When these portions are inserted into the sheath tube or pulled out of the sheath tube, they become hooking resistance and workability is lowered. When it is caught, it is unfixed, and the covered mesh or filter material is turned over. In addition, the mesh body and the filter material may be loosened between the convex portions and the convex portions, and may be caught. These are also caught by resistance when inserted into the sheath tube or pulled out of the sheath tube, and workability is lowered. Further, when the number of fixing points is increased, the opening area is reduced by that amount, and the water permeability is lowered. Furthermore, not only the work related to the sheath tube, but also during transportation, it may be caught by the convex part or slack.

A connecting member is attached to both ends of the drain pipe. The mesh body and the filter material are provided between the connecting members at both ends, but the mesh body and the filter material are particularly easily turned around and easily caught by the sheath tube or the like near the boundary with the connecting member.

In the fixing method in which the entire outer periphery is bonded with an adhesive, the adhesive protrudes into the openings of the three-dimensional network structure, the net, and the filter material, resulting in clogging and reduced water permeability.
Further, when the fixing method as described above is performed on site, the work load increases and the accuracy also decreases.

Accordingly, an object of the present invention is to provide a drain pipe that has high workability, ensures water permeability, and does not turn over a coated mesh body or filter material in view of the above-described problems of the prior art, and a method for manufacturing the same. .

The present invention includes a three-dimensional network structure, a three-dimensional network structure, a filter material that covers the outer peripheral surface of the three-dimensional network structure, and a network body that covers the outer peripheral surface of the filter material. A water-permeable drain pipe, wherein a first adhesive portion in which an outer peripheral surface of the filter material and an inner peripheral surface of the mesh body are bonded by thermal melting, an outer peripheral surface of the three-dimensional network structure, and the filter A second adhesive portion bonded to the inner peripheral surface of the material by heat melting, and provided at both ends of the drain tube are annular grooves to which a connecting member is attached to the outer peripheral surface of the three-dimensional network structure The filter material covers the outer peripheral surface of the three-dimensional network structure between the annular grooves, and the network member covers the outer peripheral surface of the filter material between the annular grooves. Features.

The present invention includes a three-dimensional network structure that is inserted into a pre-embedded sheath tube and is pulled out to cover the outer peripheral surface of the three-dimensional network structure, and the filter A water-permeable drain pipe having a net covering the outer peripheral surface of the material, wherein the outer peripheral surface of the filter material and the inner peripheral surface of the net are bonded by heat melting And a second adhesive portion in which the outer peripheral surface of the three-dimensional network structure and the inner peripheral surface of the filter material are bonded together by heat melting.

The present invention provides a three-dimensional network structure, a filter material covering the outer peripheral surface of the three-dimensional network structure and having an opening size smaller than the three-dimensional network structure, and covering an outer peripheral surface of the filter material and having an opening size. A method of manufacturing a water-permeable drain pipe having a mesh body larger than the filter material, wherein an adhesion step between the outer peripheral surface of the filter material and the inner peripheral surface of the mesh body is performed by heat melting. The bonding step between the outer peripheral surface of the three-dimensional network structure and the inner peripheral surface of the filter material is performed by heat melting, and the bonding step between the outer peripheral surface of the filter material and the inner peripheral surface of the net member is The inner peripheral surface of the mesh body is thermally melted, and the bonding step between the outer peripheral surface of the three-dimensional network structure and the inner peripheral surface of the filter material is performed on the outer peripheral surface of the three-dimensional network structure. It is performed by heat melting.

The present invention provides a water-permeable drain pipe comprising a three-dimensional network structure, a filter material that covers the outer peripheral surface of the three-dimensional network structure, and a net that covers the outer peripheral surface of the filter material. In the method, the bonding step between the outer peripheral surface of the filter material and the inner peripheral surface of the mesh body is performed by heat melting, and the outer peripheral surface of the three-dimensional network structure and the inner peripheral surface of the filter material The bonding step is performed by heat melting, and the bonding step between the outer peripheral surface of the filter material and the inner peripheral surface of the mesh body is performed by thermally melting the inner peripheral surface of the mesh body and It is performed by flattening the cross section.

According to the present invention, when the drain tube is inserted into the sheath tube or the sheath tube is pulled out, it becomes a catching resistance and can prevent the workability from being lowered. It is possible to prevent the net body and the filter material from coming off. Since it is based on heat welding, the adhesive does not protrude and an opening area can be secured, so that the water permeability due to coating does not decrease. Even in the vicinity of the boundary with the connecting member, it is possible to prevent the mesh body and the filter material from coming off.

FIG. 1A is a perspective view of a drain tube. FIG. 1B is a front view of the drain tube. FIG. 2A is a perspective view of connecting drain tubes. FIG. 2B is a cross-sectional view of connecting drain tubes. FIG. 2C is a perspective view of the connecting member. FIG. 3A is an overall view of the coating apparatus. FIG. 3B is a cross-sectional view of a wire rod of a net material flattened by a coating apparatus. FIG. 4 is a front view of the processing apparatus. FIG. 5A is a side view of the processing apparatus. FIG. 5B is a perspective view of the thermoforming roller. FIG. 6A is an explanatory diagram of construction of drain pipe installation. FIG. 6B is a cross-sectional view of the connecting member. FIG. 6C is a sectional view in which a tight pipe is attached to the drain pipe. FIG. 7A is an explanatory diagram of construction of drain pipe installation. FIG. 7B is a cross-sectional view of a tight pipe with a push rod inserted therein. FIG. 7C is a diagram showing a state in which the sheath tube is pulled out from the drain tube. FIG. 8A is a diagram for explaining the installation of the drain pipe. FIG. 8B is a view showing a state in which the tip of the push rod and the tip of the tight pipe are connected. FIG. 8C is a cross-sectional view of a tight pipe with a push rod inserted therein.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. All the specific numerical values are those in this embodiment, and actually depend on various conditions.
A drain tube 1 according to the present invention is shown in FIG.
The drain pipe 1 is formed by molding a three-dimensional network structure 2 made of polypropylene thermoplastic resin into a cylindrical wall having an outer diameter of 400 mm and an inner diameter of 220 mm, and has a length of 1 m. A plurality of drain pipes 1 are connected to form an underground drainage work.
The three-dimensional network structure 2 is a structure in which strands (strands) having a diameter of about 2 mm made of the resin are entangled and the contacts of the strands are joined. A tube having this structure has a high pressure resistance and can withstand a pressure of about 7 m in thickness.

The drain tube 1 is formed with two annular grooves 5 on the outer periphery of both ends, and a portion other than a connecting member (a connecting outer cylinder 8) described later between the annular grooves 5 at both ends. The outer peripheral surface is covered with a water-permeable filter material 3, and the outer peripheral surface is further covered with a net body 4 made of hard resin.
The filter material 3 prevents sand and the like from entering the drain pipe 1 buried in the ground and clogging immediately and impairing water permeability. When the drain tube 1 is inserted into a sheath tube 200 (to be described later) or the sheath tube 200 is pulled out by the mesh body 4, the tip portion of the filter material 3 is turned up by the friction with the inner surface of the sheath tube 200 and is compressed. Is prevented.
The filter material 3 is a polypropylene non-woven fabric, and its thickness is about 1.0 mm in a coated state. The net body 4 is a polypropylene thermoplastic resin, and its thickness is about 1 mm in a coated state. Further, the opening of the mesh body 4 is about 5 mm, and the opening ratio is larger than that of the filter material 3. The filter material 3 has a smaller opening size (fine eyes) than the three-dimensional network structure 2 and the network body 4.

The filter material 3 covers and fixes the outer peripheral surface of the three-dimensional network structure 2, and the mesh body 4 covers and fixes the outer peripheral surface. This fixing is performed by heat welding of each contact surface. Specifically, the portion (first adhesive portion) where the outer peripheral surface of the filter material 3 and the inner peripheral surface of the net body 4 are bonded is obtained by melting the inner peripheral surface side of the net body 4 with heat. And is glued. About the part (2nd adhesion part) which the inner peripheral surface of the filter material 3 and the outer peripheral surface of the three-dimensional network structure 2 adhere | attach, a filter material is made by melting the outer peripheral surface side of the three-dimensional network structure 2 with heat. 3 is bonded. Thus, since the filter material 3 having a small opening size (fine eyes) is avoided in the portion to be melted at the time of bonding, the water permeability of the drain pipe 1 can be ensured without the filter material 3 being clogged.

Since it is an adhesive part by heat welding rather than using an adhesive, there is no harmful substance contained in the adhesive, and the adhesive does not protrude from the opening, and water permeability can be secured in this respect as well. .
Since there is an adhesive portion by heat welding on the inner peripheral surfaces of the filter material 3 and the net body 4, no convex portion is generated on the outer periphery of the drain tube 1 as in the fixing method using a vinyl tape, a band or the like. Absent.

The ends of the drain pipe 1 that are not covered with the filter material 3 and the mesh body 4 are joined together using a connecting member, as shown in FIGS. 2A and 2B. The connecting member includes a connecting outer cylinder 8 and a connecting inner cylinder 7.
The connecting outer cylinder 8 is made of hard synthetic resin which is difficult to deform, and four connecting member annular protrusions 8d having a square cross section are formed on the inner peripheral surface in this embodiment. As shown in FIG. It consists of a pair of

halves

8a and 8b which are divided into two.
The

halves

8a and 8b of the connecting outer cylinder 8 are put between the end portions of the drain pipes 1 that are butted together, and the connecting member annular protrusion 8d is inserted into the annular groove 5 formed in the three-dimensional network structure 2 of the drain pipe 1. In addition, the band 9 is wound around the connecting member annular groove 8c on the outer surface side of the connecting member annular protrusion 8d, and the connecting outer cylinder 8 is attached.

The connecting outer cylinder 8 can be easily put on the outer peripheral surface of the butted portion of the drain pipe 1 from the outside in the radial direction, and the operation is simple. Further, since the drain tube 1 is connected by covering the outer peripheral surface of the butted portion with the connecting outer cylinder 8, the butted portion of the drain tube 1 is not easily displaced even if a shearing force is applied in the event of an earthquake or the like. Furthermore, since the connecting member annular protrusion 8d having a quadrangular cross section is fitted and attached to the annular groove 5 having a quadrangular cross section, the tensile strength is high. And the connection outer cylinder 8 made into the half halves 8a and 8b is easy to attach and mold.
The connecting outer cylinder 8 is not split in half, but is attached so that the side surface is cut in one axial direction and the end of the drain tube 1 is sandwiched with the cut ends opened to both sides. You can also.

As shown in FIG. 2B, the connecting inner cylinder 7 may be used together with the connecting outer cylinder 8 as a connecting member, and is an auxiliary connecting member. The connecting inner cylinder 7 is made of a hard synthetic resin that is thin and high in strength, and as shown in FIG. 1B, a plurality of locking claws 7a are formed at both ends thereof. The locking claw 7 a is inclined and raised outward so that the tip is directed toward the axial center, and when the end of the connecting inner cylinder 7 is inserted into the inner peripheral surface of the three-dimensional network structure 2 of the drain tube 1. Even if the connecting inner cylinder 7 is pulled out from the drain tube 1, the locking claw 7 a cannot bite into the inner peripheral surface of the three-dimensional network structure 2 of the drain tube 1 and is prevented from being pulled out. The inner diameter of the connecting inner cylinder 7 is larger than the outer diameter of the tight pipe 6. The joint strength is further increased by the combined use of the connecting inner cylinder 7.

As shown in FIG. 1, the tightening pipe 6 is inserted into the inner peripheral surface of the three-dimensional network structure 2 of the drain pipe 1 and inserted into the sheath pipe 200, and is pulled out later. The outer diameter corresponds to the inner diameter of the three-dimensional network structure 2 and is set so as to ensure a gap when the connecting inner cylinder 7 is employed. It is desirable that the tight pipe 6 and the drain pipe 1 can be inserted into the sheath pipe 200 and are appropriately fixed so as not to hinder the withdrawal of the tight pipe 6.

A method of manufacturing the drain pipe 1 by coating the three-dimensional network structure 2 with the filter material 3 and the network body 4 by heat welding will be described with reference to FIG. 3A.
As a whole flow, the filter material 3 and the mesh body 4 are thermally welded, cut to a required length, and the filter material 3 to which the mesh body 4 is bonded and the three-dimensional network structure 2 are thermally welded. The manufacturing apparatus used in this process includes a first heating roller 10a, a second heating roller 10b,

first pressure rollers

11a and 11b, a second pressure roller 11c, tension rollers 12a to 12c, guide rollers 13a to 13g, a

cover

14a, 14b.

The rolled filter material 3 and net material 4 are set. The filter material 3 pulled out from the roll is adjusted in tension by the tension roller 12c and sent to the

first pressure rollers

11a and 11b.
The tension | tensile_strength is adjusted with the tension |

tensile_strength rollers

12a and 12b, and the net | network material 4 pulled out from the roll is heated with the 1st heating roller 10a, and is fuse | melted. The lower side in FIG. 3A is melted from the inner side surface of the drain tube 1. The first heating roller 10a is heated to about 200 to 230 ° C. in the case of polypropylene (the melting point of the mesh material 4 is assumed to be about 180 to 200 ° C.). The melted net 4 is sent to the

first pressure rollers

11a and 11b.

The filter material 3 and the mesh material 4 are pressure-bonded by the

first pressure rollers

11a and 11b. The

first pressure roller

11a, 11b can adjust the gap. In addition to simply crimping, the melted mesh material 4 can be adhered to the filter material 3 while making the thickness of the molten mesh material 4 thinner than the original thickness. If it does in this way, as shown to FIG. 3B, since the cross section of the wire 4a which comprises the net | network material 4 can be flattened, the frictional resistance with the sheath tube 200 can further be reduced. 3B shows the case where the cross section of the wire 4a is circular, and the lower figure shows the case where the cross section of the wire 4a is rectangular. In the figure, 4 b is an opening of the net 4. When flattened, the area of the opening 4b is reduced. Therefore, when the net member 4 is thinned by pressure bonding, it is set in consideration thereof.
The part to be bonded may be all or may be a part. The slack will be less if you use it as a whole. In the case of bonding a part, the width and heating area of the first heating roller 10a are adjusted. Moreover, if it is heat-welded to the end part which becomes a boundary part with the connection outer cylinder 8 (connection member), it is possible to reduce the catch and turn by this part, but it is not necessarily necessary to heat-weld to this part. Absent.

The welded and integrated filter material 3 and net 4 are sent out by

guide rollers

13a and 13b and cut. The cutting is performed according to the length of the outer periphery of the three-dimensional network structure 2.
The cut filter material 3 and the net 4 are sent to the second pressure roller 11c by the

guide rollers

13c and 13d.

The three-dimensional network structure 2 is rotatably supported, and the second heating roller 10b can be rotated in accordance with the rotation. The outer peripheral surface of the three-dimensional network structure 2 is heated and melted by the second heating roller 10b. The filter material 3 and the net 4 integrated on the melted outer peripheral surface are pressure-bonded by the second pressure roller 11c. The second heating roller 10b is heated to about 200 to 230 ° C. in the case of polypropylene (the melting point of the three-dimensional network structure 2 is assumed to be about 180 to 200 ° C.).
The filter material 3 and the mesh body 4 that have been pressure-bonded are guided along the outer peripheral surface of the three-dimensional network structure 2 by

guide rollers

13e, 13f, and 13g. If the filter material 3 and the mesh body 4 are pressure-bonded to the entire outer peripheral surface of the three-dimensional network structure 2, the rotation is stopped and the drain pipe which is the three-dimensional network structure 2 covered with the filter material 3 and the mesh body 4. Take 1 out.
The part to be bonded may be all or may be a part. The slack can be reduced by making the whole. In the case of bonding a part, the width and the heating area of the second heating roller 10b are adjusted. Further, when the boundary portion covered by the connecting outer cylinder 8 (connecting member) is thermally welded, it is possible to reduce catching and turning by this portion, but it is not always necessary to thermally weld to this portion. At the time of crimping, care is taken so that the openings of the three-dimensional network structure 2 do not decrease more than necessary.

In this embodiment, the materials of the three-dimensional network structure 2, the filter material 3, and the network 4 are unified with polypropylene. If it does in this way, since the raw material is the same when performing heat welding, adhesive strength can also be made high. However, the material may be different if the strength is not required.

The annular groove 5 formed in the three-dimensional network structure 2 of the drain tube 1 is formed by thermally melting the outer peripheral surface of the three-dimensional network structure 2 constituting the wall of the drain tube 1.
In order to form the annular groove 5, a processing apparatus 100 shown in FIGS. 4 and 5 is used.
The processing apparatus 100 includes a front support table 101 and a rear support table 102 that are erected in opposition to each other, a tube receiving table 103 that is installed between the front support table 101 and the rear support table 102, and a front support table. A heating roller 104 is provided between 101 and the tube receiving base 103 so as to be swingable up and down above the vicinity of the front support base 101.

The rear support table 102 can be moved in the distance from the front support table 101, and a rotating disk 105 is provided on each of the opposing surfaces of the front support table 101 and the rear support table 102. A plurality of support claws 106 protrude from opposing surfaces of the front and rear rotating plates 105, and the rotating plate 105 of the front support base 101 is driven to rotate by a motor 107.
As shown in FIG. 5A, a receiving part 108 having a semicircular cross section is provided at the upper end of the tube receiving base 103, and a plurality of support rollers 109 are installed at equal intervals in the circumferential direction on the upper surface of the receiving part 108.

The heating roller 104 has a hollow cylindrical shape, and two flanges 113 having a square cross section are formed on the outer periphery (FIG. 5B).
The heating roller 104 is attached to the tip of a swing arm 111 projecting from the support column 110 so as to swing up and down. The heating roller 104 rises by winding up the chain 112 connected to the swing arm 111, and when the chain 112 is rewound, It comes to descend at. A stopper 114 that restricts the lower limit position of the heating roller 104 is provided below the heating roller 104 (FIG. 5A). The position of the stopper 114 can be adjusted up and down.
A heater 115 is mounted inside the heating roller 104 so that the entire heating roller 104 can be heated to a temperature equal to or higher than the melting point of the thermoplastic resin that is the material of the three-dimensional network structure 2 (FIG. 5B). .

In order to form the annular groove 5 by the processing apparatus 100, first, the rear support base 102 is moved backward and away from the front support base 101, and as shown in FIG. 4 and FIG. A three-dimensional network structure 2 (the drain pipe 1 not covered with the filter material 3 and the network body 4) is placed on 109.
Next, the rear support base 102 is advanced to sandwich the three-dimensional network structure 2 between the front support base 101 and the rear support base 102, and the support claws 106 of the front support base 101 and the rear support base 102 are connected to the three-dimensional network structure. Bit into both end faces of 2.
When the turntable 105 of the front support base 101 is rotated in this state, the turntable 105 of the three-dimensional network structure 2 and the rear support base 102 is rotated.

Next, the heating roller 104 is lowered and the flange 113 of the heating roller 104 is pressed against the outer peripheral surface of the three-dimensional network structure 2. The portion of the outer peripheral surface of the three-dimensional network structure 2 where the heating roller 104 hits is melted by the heat of the heating roller 104 (for example, about 200 to 230 ° C. in the case of polypropylene), and the heating roller 104 gradually descends. .
At this time, since the three-dimensional network structure 2 is rotating, grooves are formed on the outer periphery of the three-dimensional network structure 2 along the circumferential direction. When the resin strand melted by the contact with the heating roller 104 adheres to the heating roller 104, a thin heat resistant film or aluminum foil is wound and then pressed.
The lower side of the heating roller 104 is restricted by the stopper 114 at a height at which the portion inside the flange 113 does not contact the three-dimensional network structure 2, and the same shape as the cross section of the flange 113 is formed at one end of the three-dimensional network structure 2. Two annular grooves 5 are formed. The depth of the annular groove 5 can be adjusted by adjusting the height of the stopper 114. Further, the present invention can be applied when the tube diameter of the three-dimensional network structure 2 is changed.
The speed at which the annular groove 5 is formed depends on the thickness and density of the string-like strands and the temperature.

After forming the annular groove 5 at one end of the three-dimensional network structure 2, the heating roller 104 is raised, the rear support base 102 is retracted to release the three-dimensional network structure 2, and the three-dimensional network structure The body 2 is set upside down in the processing apparatus 100, and two annular grooves 5 are formed in the other end of the three-dimensional network structure 2 in the same manner. If the heating roller 104 is disposed at a position corresponding to both ends of the three-dimensional network structure 2, it is not necessary to replace the three-dimensional network structure 2 in the front-rear direction.
Thus, since the annular groove 5 is formed by heat melting, cutting waste does not come out and the strength of the portion where the annular groove 5 is formed does not decrease. Rather, resin strands melt on the inner surface of the annular groove 5 and the end surfaces of the strands exposed on the groove surface are joined together to improve the strength. Further, the groove surface is flat, and the connecting member annular protrusion 8d of the connecting outer cylinder 8 can be firmly fitted.
For this reason, the connection location between the drain pipes 1 is firmly connected.
In the present embodiment, the annular groove 5 is formed before the filter material 3 and the mesh body 4 cover the three-dimensional network structure 2. However, the present invention is not limited to this, and the three-dimensional network structure 2 may be covered with the filter material 3 and the net body 4 after the annular groove 5 is formed.

Next, a method for installing the drain pipe 1 will be described with reference to FIGS. The drain pipe 1 is installed by being pulled out after being inserted into the sheath pipe 200 embedded in advance.
As shown in FIG. 6, the drain pipe 1 is inserted into the sheath pipe 200 embedded by the propulsion unit 203 from the start vertical shaft 201 side between the start vertical shaft 201 and the arrival vertical shaft 202. 201a and 202a in the figure are wellhead equipments attached to the start well of the start shaft 201 and the reach well of the reach shaft 202, respectively.

The drain pipe 1 and the tight pipe 6 are prepared, and the tight pipe 6 is inserted and attached inside the drain pipe 1. The tight pipe 6 has a male screw portion 6a protruding from one end of the drain pipe 1 so as to be screwed into the female screw portion 6b of the tight pipe 6 to be connected (FIG. 6C).
The drain pipe 1 including the tight pipe 6 is pushed into the sheath pipe 200 from the start shaft 201 while sequentially connecting the end portions of the drain pipe 1 and the end portions of the tight pipe 6. The drain pipe 1 and the tightening pipe 6 are inserted between them. The ends of the drain pipe 1 are connected to each other using the connecting members (the connecting outer cylinder 8 and the connecting inner cylinder 7) described above.
At this time, since the mesh body 4, the filter material 3, and the three-dimensional network structure 2 are heat-welded, the outer peripheral surface has neither protrusions nor slack, so that the resistance to the sheath tube 200 is small. In addition, the net body 4 and the filter material 3 are not turned over. Therefore, working efficiency is improved.

When the drain tube 1 is pushed into the sheath tube 200, a biodegradable lubricant (grease made of plastic) may be provided around the outer periphery of the distal end side of the drain tube 1. The grease strikes the inner surface of the sheath tube 200 when the drain tube 1 is pushed into the sheath tube 200 and is applied to the entire outer peripheral surface of the drain tube 1. As a result, muddy water can be prevented from entering the drain pipe 1 during construction, and the sliding of the drain pipe 1 with respect to the sheath pipe 200 is further improved.
Since this grease is decomposed and disappeared by living organisms in the soil after the drain pipe 1 is buried in the ground, there is no fear that the water collecting function of the drain pipe 1 will be hindered by the grease, and the environment will be polluted. There is no worry.

Hereinafter, refer to FIG. The start side tightening nut 206 is screwed into the end portion of the disposed tightening pipe 6 that protrudes from the start shaft, and is brought into contact with the wellhead equipment 201a. In addition, a seal head 207 is attached to an end of the binding pipe 6 on the arrival shaft 202 side, is brought into contact with the surface of the drain pipe 1 on the arrival shaft 202 side, and is screwed into the fastening pipe 6 to reach an arrival side tightening nut 208. Secure with. As a result, the drain pipe 1 is prevented from moving in the sheath pipe 200 to the start shaft 201 side and the arrival shaft 202 side.

The tail seal 205 is attached to the periphery of the end of the vertical shaft 201 (the last part) of the sheath pipe 200 using screws and a metal band. The tail seal 205 is made of a soft synthetic resin having flexibility and stretchability, and has a tapered cylindrical shape that gradually decreases in diameter toward the rear end. The inner diameter of the end portion of the tail seal 205 is smaller than the outer diameter of the drain tube 1 and is in contact with the outer peripheral surface of the drain tube 1.

The push rod 209 is pushed in and inserted from the starting shaft 201 into the tight pipe 6 in order, and the push rod 209 reaches the reaching shaft 202. As shown in FIG. 7B, the push rod 209 has a spacer 210 that moves in contact with the inner surface of the binding pipe 6.
On the reach shaft 202 side, the tip of the sheath tube 200 and the tip of the push rod 209 are connected to the sheath tube push-out fitting 204.

When the push rod 209 is pushed by the propulsion unit 203, the sheath tube 200 is pulled out to the reaching shaft 202. At this time, since the drain pipe 1 cannot be moved to the reaching shaft 202 side together with the tight pipe 6, the drain pipe 1 is not dragged to the reaching shaft 202 side with the movement of the sheath pipe 200.
Even when the sheath tube 200 is pulled out, the mesh body 4, the filter material 3, and the three-dimensional network structure 2 are thermally welded. Therefore, the outer peripheral surface has neither convex portions nor slack. There is little resistance to 200. In addition, the net body 4 and the filter material 3 are not turned over. Therefore, working efficiency is improved.

Further, as shown in FIG. 7C, the tail seal 205 moves at the rear portion of the sheath tube 200 while contacting the peripheral surface of the drain tube 1 at the rear edge portion. That is, as the sheath tube 200 is pulled out, soil and sand together with the spring water are prevented from entering between the drain tube 1 and the sheath tube 200. Thereby, the friction at the time of extraction is increased by the earth and sand that has entered between the drain pipe 1 and the sheath pipe 200, and an excessive load is applied to the propulsion unit 203 that pushes the push rod 209, or the sheath pipe 200 is moved. It is possible to prevent things from becoming impossible.
In the drain pipe 1 of the present invention, the net body 4, the filter material 3, and the three-dimensional network structure 2 are thermally welded. The tail seal 205 is caught and resistance is reduced.

The sheath tube 200 and the push rod 209 pulled out into the reaching shaft 202 are disassembled and collected while the sheath tube push-out fitting 204 is replaced. Then, the last sheath tube 200 is recovered together with the tail seal 205.
As a result, the drain pipe 1 provided with the tight pipe 6 is left.

Hereinafter, reference will be made to FIG. The start side tightening nut 206, the reaching side tightening nut 208 and the seal head 207 are removed, and the restraint between the tightening pipe 6 and the drain pipe 1 is released.
The distal end of the push rod 209 and the distal end of the tightening pipe 6 are connected by the tightening pipe pull-out fitting 211 and pulled by the propulsion unit 203. Then, the push rod 209 is pulled out to the start shaft 201 side, and the binding pipe 6 and the push rod 209 are pulled out from the drain pipe 1 to the start shaft 201. Then, the fastening pipe 6 and the push rod 209 are disassembled and collected on the start shaft 201 side.
The process is repeated to leave only the drain pipe 1 between the starting shaft 201 and the reaching shaft 202. In this way, the drain pipe 1 is buried.

The present invention is not limited to the above embodiments.
In the present embodiment, the drain tube 1 is inserted into the buried sheath tube 200, and the sheath tube 200 is pulled out so that the drain tube 1 is buried in the ground. However, the present invention can be applied even when the drain pipe 1 is directly embedded by excavation without providing the sheath pipe 200.
In that case, since the drain tube 1 of the present invention is thermally welded to the net body 4, the filter material 3, and the three-dimensional network structure 2 even after being embedded, the water permeability is also lowered due to the protruding adhesive. It does not occur and can be applied by paying attention to the effect that a sufficient drainage function can be secured.
Further, the mesh body 4 has a function of protecting the filter material 3 from the sheath tube 200. However, when used in the excavation, pay attention to the effect of protection during transportation to ensure the strength of the drain tube 1. Can be applied.
For example, the net body 4 may be formed of a biodegradable material. Then, like the previous grease, the drain pipe 1 is buried in the ground and then decomposed and disappeared by living organisms in the soil, so that the water collecting function of the drain pipe 1 is ensured, and the environment There is no worry of contamination.

Industrial application fields

It can be used for a drain pipe used in a non-open-drain drain pipe embedding method applied to a ground water level lowering method that prevents ground liquefaction by draining groundwater and lowering the groundwater level, and a manufacturing method thereof.

DESCRIPTION OF SYMBOLS 1 Drain pipe 2 3D network structure 3 Filter material 4 Net body 5 Annular groove 6 Tightening pipe 6a Male thread part 6b Female thread part 7 Connection inner cylinder 7a Locking claw 8 Connection outer cylinder 8c Connection outer cylinder annular protrusion 8d Connection Outer cylinder annular groove 9 Band 10a First heating roller 10b

Second heating roller

11a, 11b First pressure roller 11c Second pressure roller 12 Tension roller 13 Guide roller 14 Cover 100 Processing device 101 Front support table 102 Rear support table 103 Tube Receiving base 104 Heating roller 105 Turntable 106 Supporting claw 107 Motor 108 Receiving portion 109 Supporting roller 110 Post 111 Swing arm 112 Chain 113 Flange 114 115 heater 200 sheath pipe 201 starting pit 202 arrival pit 203 propulsion unit 204 sheath pipe extrusion bracket 205 tail seal 206 starting side Tightened nut 207 seals the head 208 reaches the side Tightened nut 209 push rod 210 spacer

Claims

A water-permeable drain pipe comprising a three-dimensional network structure, a filter material covering the outer peripheral surface of the three-dimensional network structure, and a net body covering the outer peripheral surface of the filter material,
A first adhesive part in which the outer peripheral surface of the filter material and the inner peripheral surface of the mesh body are bonded by heat melting;
A second adhesive portion in which an outer peripheral surface of the three-dimensional network structure and an inner peripheral surface of the filter material are bonded by heat melting;
At both ends of the drain pipe, an annular groove is provided to which a connecting member is attached to the outer circumferential surface of the three-dimensional network structure, and the filter material is disposed between the annular grooves and the outer circumferential surface of the three-dimensional network structure. The drain pipe is characterized by covering the outer peripheral surface of the filter material between the annular grooves.
A three-dimensional network structure that is inserted into a pre-embedded sheath tube and pulled out of the sheath tube, covers the outer peripheral surface of the three-dimensional network structure, and the outer peripheral surface of the filter material A water-permeable drain pipe comprising
A first adhesive part in which the outer peripheral surface of the filter material and the inner peripheral surface of the mesh body are bonded by heat melting;
A second adhesive portion in which the outer peripheral surface of the three-dimensional network structure and the inner peripheral surface of the filter material are bonded by heat melting;
A drain tube comprising:
A three-dimensional network structure, a filter material covering an outer peripheral surface of the three-dimensional network structure and having an opening size smaller than the three-dimensional network structure, and an outer peripheral surface of the filter material covering an outer diameter of the filter material. A method for producing a water permeable drain pipe comprising a large mesh body,
The bonding process between the outer peripheral surface of the filter material and the inner peripheral surface of the mesh body is performed by heat melting,
The bonding step between the outer peripheral surface of the three-dimensional network structure and the inner peripheral surface of the filter material is performed by heat melting,
The bonding step between the outer peripheral surface of the filter material and the inner peripheral surface of the mesh body is performed by thermally melting the inner peripheral surface of the mesh body,
The method for manufacturing a drain tube, wherein the bonding step between the outer peripheral surface of the three-dimensional network structure and the inner peripheral surface of the filter material is performed by thermally melting the outer peripheral surface of the three-dimensional network structure. .
A method for producing a water-permeable drain pipe comprising: a three-dimensional network structure; a filter material that covers an outer peripheral surface of the three-dimensional network structure; and a network body that covers the outer peripheral surface of the filter material. ,
The bonding process between the outer peripheral surface of the filter material and the inner peripheral surface of the mesh body is performed by heat melting,
The bonding step between the outer peripheral surface of the three-dimensional network structure and the inner peripheral surface of the filter material is performed by heat melting,
The bonding step between the outer peripheral surface of the filter material and the inner peripheral surface of the mesh body is performed by thermally melting the inner peripheral surface of the mesh body and flattening a cross section of the wire material of the mesh body. A method for manufacturing a drain pipe.