JP2008190289A - Insertion method of filter member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insertion method of filter members and to make it easy to construct a drainage line. <P>SOLUTION: This is an insertion method of filter members to form filter layers 6 with a plurality of filter members 7 in a tunnel 2 by inserting the plurality of filter members 7 in the tunnel 2 excavated on the ground. A rope 21 is inserted in the plurality of filter members 7, each filter member 7 is formed in series by connecting to the rope 21, and in this condition, the rope 21 and the plurality of filter members 7 is inserted together in the tunnel, the plurality of filter members 7 is arranged over the total length of the tunnel 2 and a series of filter layers 6 is constituted of the plurality of filter members 7 in the tunnel 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for inserting a filter member, and in particular, a filter applied when a plurality of filter members are inserted into a tunnel drilled in the ground to construct a filter layer composed of a plurality of filter members in the tunnel. The present invention relates to a member insertion method.

  In recent years, in order to prevent flooding of rivers, a drain pipe that connects the inside and outside of a river dike is provided, and the water in the river dike is discharged to the drainage channel via this drain pipe. The inside is kept at a predetermined water level.

  When a drain pipe having such a configuration is provided, a groove communicating with the inside of the river bank is provided, and a filter layer is formed by laying gravel, sand, etc. in the groove, and the excavated soil is grooved. By burying it inside, a drain pipe that communicates with the embankment inland is constructed.

  By the way, when constructing a drain pipe by the above-mentioned method, it is necessary to provide a groove communicating with the inland side of the embankment, so if there are buildings such as roads or private houses, temporarily Relocation and detouring have to be provided, and the construction requires a lot of labor and time, and the construction period becomes longer and the construction cost increases.

  The present invention has been made in view of the conventional problems as described above, and can greatly reduce the time and labor required for construction, shorten the construction period, and greatly reduce the construction cost. An object of the present invention is to provide a filter member insertion method that can be reduced.

The present invention operates the following means in order to solve the above problems.
That is, the invention according to claim 1 is a method of inserting a filter member for inserting a plurality of filter members into a tunnel drilled in the ground and forming a filter layer by the plurality of filter members in the tunnel. Then, a rope is inserted into the inside of the plurality of filter members, each filter member is connected to the rope to form a bead shape, and in this state, the rope and the plurality of filter members are inserted together in the tunnel, A plurality of filter members are arranged over the entire length, and a series of filter layers composed of the plurality of filter members are constructed in the tunnel.

  According to the method for inserting filter members according to the present invention, the plurality of filter members having low strength are each formed into a bead shape by being connected to a rope that passes through the inside of the filter member. A series of filter layers are constructed which are inserted and arranged over the entire length of the tunnel and which comprise a plurality of filter members within the tunnel. Therefore, the filter member can be inserted into the tunnel excavated in the ground without moving the upper structure, and the construction can be performed even if the filter member has a low tensile strength or compressive strength.

  The invention according to claim 2 is the method for inserting a filter member according to claim 1, wherein the filter member is a resin tubular member having a mesh-like tube wall.

  According to the filter member insertion method of the present invention, soil, sand or the like having a particle size equal to or greater than a predetermined particle size is captured by the mesh-like tube wall of the filter member and prevented from entering the filter member. Water such as soil, sand and the like having a particle size or less, and groundwater pass through the tube wall of the filter member and are collected in the filter member. For this reason, unlike a general filter, fine-grained soil does not stick to the surface and cause clogging, and the filter effect can be exhibited semipermanently. Further, since the resin tubular member has a specific gravity substantially the same as that of water, it becomes the same as a drifting state in groundwater, and the frictional resistance with the inner peripheral surface of the tunnel can be reduced.

  The invention according to claim 3 is the method for inserting the filter member according to claim 1 or 2, wherein a plurality of spacers projecting radially outward are integrally provided on the outer peripheral surface of the filter member, By bringing the spacer into contact with the inner wall surface of the tunnel, the filter member is positioned substantially at the center of the tunnel.

  According to the method for inserting a filter member according to the present invention, the resin filter member drifting in the groundwater in the tunnel is positioned and fixed at a substantially central portion in the tunnel by the spacer. The function as a filter can be exhibited reliably.

  The invention according to claim 4 is the method for inserting a filter member according to any one of claims 1 to 3, wherein a joint for integrally joining adjacent filter members between the adjacent filter members is provided. Is interposed, and the rope is connected to the joint.

  According to the filter member insertion method of the present invention, the adjacent filter members are not separated from each other, so that a series of filter layers composed of a plurality of filter members can continue to function as a filter over a long period of time. Further, since the rope is connected to the joint, when inserting the filter member into the tunnel, the load due to the insertion does not act on the filter member, and the strength of the filter member can be reduced. It is possible to prevent the member from being deformed. Furthermore, the fine particles sucked into the filter member by the joint are dammed up for each filter member and accumulate on a part of each filter member, so that the drainage cross section is reduced. There is no.

  The invention according to claim 5 is the method for inserting a filter member according to any one of claims 1 to 4, wherein a flange portion projecting radially outward is interposed between the adjacent filter members. The flange formed between the plurality of filter members and the inner wall surface of the tunnel is partitioned into a plurality of longitudinal directions of the tunnel by bringing the outer peripheral end of the flange portion into contact with the inner wall surface of the tunnel. It is characterized by.

  According to the filter member insertion method of the present invention, the gap formed between the filter member and the inner wall surface of the tunnel is partitioned into a plurality of chambers by the partition walls. Does not move between adjacent rooms.

  The invention according to claim 6 is the filter member insertion method according to claim 5, wherein a bent portion that is bent in one axial direction of the filter member is provided at an outer peripheral end portion of the flange portion. The movement of the filter member in the tunnel is prevented by bringing the bent portion into contact with the inner wall surface of the tunnel.

  According to the filter member insertion method of the present invention, the filter member is prevented from moving in the tunnel by bringing the bent portion of the flange portion into contact with the inner wall surface of the tunnel. Moreover, it can prevent that an excessive force is applied to a rope at the time of installation of a filter member by manufacturing a flange part with the water-proof sheet | seat etc. which are rich in a flexibility.

  The invention according to claim 7 is the method for inserting a filter member according to any one of claims 1 to 6, wherein the outer peripheral surface of each filter member is provided with a recess extending over the entire length of each filter member, An injection tube for filling a granular material in a gap between the filter member and the tunnel is inserted into the recess.

  According to the method for inserting a filter member according to the present invention, the granular material is filled between the filter member and the inner wall surface of the tunnel via the injection pipe, whereby the layer formed by the granular material and the tube wall of the filter member are used. A double filter is formed. By making the granular material have the same specific gravity as the injection liquid (mainly water), the pressure-feeding resistance can be reduced at the time of injection, so that it can be injected into the compartment while drifting to the injection liquid. Moreover, the injection liquid can be used repeatedly.

As described above, according to the filter member insertion method of the present invention, when a plurality of filter members are inserted into a tunnel in which the ground is drilled, a plurality of filter members are inserted together with a rope. Since a plurality of filter members can be arranged in series over the entire length of the tunnel, the time and labor required to insert the filter member can be greatly reduced, the construction period can be shortened, and the construction cost can be reduced. You can also.
In addition, since the filter member is made of resin, it can be inserted into the tunnel in a floating state when groundwater penetrates into the tunnel, so that the insertion resistance can be greatly reduced, and insertion work can be performed. Can be easily.
Furthermore, since the gap formed between the filter member and the inner wall surface of the tunnel by the partition wall can be partitioned into a plurality of chambers, the deposits deposited at the bottom of each chamber may flow downstream. Therefore, the clogging of the partition wall of the filter member can be prevented, and the filter function can be obtained for a long time.
Further, since the gap between the filter member and the inner wall surface of the tunnel is filled with the granular material, a double layer of the layer formed by the granular material and the layer formed by the tube wall of the filter member functions as a filter. become. In addition, the soil around the outer periphery of the granular material also functions as a filter by the soil on the outer periphery when fine-grained soil enters the filter member, so that a multiple filter layer can be formed.

Hereinafter, embodiments of the present invention shown in the drawings will be described.
1 to 4 show an embodiment of a filter member insertion method according to the present invention. This filter member insertion method is a drain pipe line 1 provided for adjusting the water level of a river 25. And is effective for inserting the filter member 7 into the drain pipe line 1.

  In the drain pipe 1, for example, a tunnel 2 having a predetermined slope communicating with the inland side of the dike 26 of the river 25 is drilled by a mini shield method or the like, and the filter member according to the present embodiment is inserted into the tunnel 2. It is constructed by inserting a plurality of filter members 7 using a method. In the present embodiment, the inner diameter of the tunnel 2 is about 300 mm.

  The filter member 7 is a tubular member made of a synthetic resin having a mesh-structured tube wall 8, and a function as a filter is obtained by the mesh structure of the tube wall 8, such as ground water and soil or sand having a predetermined particle size or less. It allows entry into the interior and prevents entry of soil, sand, etc. of a predetermined particle size or more. Since the filter member 7 has a characteristic excellent in impact resistance, the filter member 7 is not crushed by earth pressure, and can exhibit a predetermined filter function over a long period of time.

  In the present embodiment, a filter member 7 having a specific gravity of about 1.0, a length of 4 m to 6 m, an inner diameter of about 200 mm, and an outer diameter of about 250 mm is used.

  Spacers 9 projecting radially outward are integrally provided at a plurality of locations on the outer peripheral surface of the filter member 7, and the tip of the spacer 9 is brought into contact with the inner wall surface 3 of the tunnel 2 so that the filter member 7 is It is positioned at the approximate center of the tunnel 2.

  The spacer 9 is formed by bending a synthetic resin wire into a substantially V shape, and joining both ends thereof to the tube wall of the filter member 7 by heat fusion, bonding with an adhesive, or the like. In the embodiment, the filter member 7 is provided at three locations on the outer peripheral surface of the filter member 7 at equal intervals in the circumferential direction. The spacers 9 are not limited to three locations, and may be provided at four or more locations. The shape of the spacer 9 is not particularly limited, and may be any shape that can position the filter member 7 at a substantially central portion of the tunnel 2. The spacer 9 may be made of metal.

  A part of the outer peripheral surface of the tube wall 8 of the filter member 7 is provided with a recess 10 having a semicircular or arcuate recess that is recessed inward in the radial direction, and an injection tube 11 to be described later is provided in the recess 10. Inserted into the gap 4 formed between the fill member 7 and the inner wall surface 3 of the tunnel 2 through the injection tube 11 is filled with a granular material 20 to be described later.

  When the plurality of filter members 7 are inserted into the tunnel 2, the adjacent filter members 7 and 7 are integrally connected via a joint 12 as shown in FIG. 4. The joint 12 includes a cylindrical main body portion 13 formed of a synthetic resin and an annular flange portion 14 that is integrally provided at the center of the outer peripheral surface of the main body portion 13, and the main body portion 13 is formed by the flange portion 14. Is divided into two halves, one half 15 and the other half 16.

  One half 15 of the main body 13 of the joint 12 is inserted into one adjacent filter member 7, and the other half 16 is inserted into the other adjacent filter member 7, By inserting the halves 15 and 16 of the main body 13 into the filter members 7 and 7 until the end surfaces of the abutments 7 come into contact with both surfaces of the flange portion 14 of the joint 12, the adjacent filter members 7 and 7 are connected to the joint. 12 are connected together.

  The outer peripheral surfaces of one half 15 and the other half 16 of the main body 13 of the joint 12 are respectively formed as tapered surfaces having a predetermined angle, and the one half 15 and the other half of the main body 13 are formed by the tapered surfaces. The insertion of the portion 16 into each filter member 7 is facilitated.

  Further, on the outer peripheral surface of one half portion 15 and the other half portion 16 of the main body portion 13 of the joint 12, a retaining projection 17 is integrally provided at a plurality of locations, and the retaining projection 17 is attached to each of the peripheral portions. By engaging the inner wall surface of the filter member 7, the joint 12 is prevented from coming out between the adjacent filter members 7, 7.

  Note that the joint 12 is not limited to the one having the above-described configuration, and may have any configuration that can connect the adjacent filter members 7 and 7 together.

  A disc-shaped resin partition wall 18 is mounted on the outer peripheral surface of the other half portion 16 of the body portion 13 of the joint 12, and the outer peripheral end portion of the partition wall 18 is brought into contact with the inner wall surface 3 of the tunnel 2. Thus, a plurality of gaps 4 formed between the inner wall surface 3 of the tunnel 2 and the outer peripheral surface of the filter member 7 between the adjacent partition walls 18 and 18 are partitioned in the longitudinal direction of the tunnel 2.

  A bent portion 19 that bends at a predetermined angle in the axial direction of the joint 12 is provided at the outer peripheral end portion of the partition wall 18, and the outer peripheral end of the bent portion 19 is brought into contact with the inner wall surface 3 of the tunnel 2, thereby The member 7 is prevented from moving in the direction opposite to the insertion direction.

  A later-described rope 21 is inserted into the filter member 7, and by fixing the filter member 7 to the rope 21, the filter member 7 is inserted into the tunnel 2 together with the rope 21. A filter layer 6 by the filter member 7 is constructed.

  In order to insert the filter member 7 into the tunnel 2, a resin or steel rope 21 is inserted from the entrance to the exit of the tunnel 2, and a plurality of filter members 7 are inserted into the tunnel 2 together with the rope 21. The plurality of filter members 7 are arranged in series over the entire length in the tunnel 2.

  Specifically, a resin-made or steel-made rope 21 longer than the entire length of the tunnel 2 is prepared, and this rope 21 is passed through the inside of the plurality of filter members 7 and is interposed between adjacent filter members 7, 7. The rope 21 is welded to the joint 12 and fixed by a fixing means such as a band, and the plurality of filter members 7 are connected in a bead shape through the rope 21.

  Then, using the mini shield or the like used when drilling the tunnel 2, the tip of the rope 21 is fixed to the mini shield or the like, and the mini shield or the like is advanced from the entrance to the exit in the tunnel 2, or from the exit The plurality of filter members 7 are inserted into the tunnel 2 together with the rope 21 by retracting toward the entrance.

  In this case, since the filter member 7 is made of a resin having a specific gravity of about 1.0, the filter member 7 can be floated in the tunnel 2 when the groundwater penetrates into the tunnel 2. Therefore, the resistance at the time of insertion of the filter member 7 can be made very small, and the insertion work of the filter member 7 into the tunnel 2 can be facilitated.

  When the filter member 7 is inserted into the tunnel 2, the injection tube 11 is previously inserted into the recess 10 on the outer peripheral surface of the tube wall 8 of the filter member 7, and the injection tube 11 is connected to the tunnel 2 together with the filter member 7. After the insertion of the filter member 7 is completed, the granular material 20 described later is filled into the gap 4 between the inner wall surface 3 of the tunnel 2 and the outer peripheral surface of the filter member 7 through the injection pipe 11. .

  In this way, by inserting the plurality of filter members 7 together with the ropes 21 into the tunnel 2, the plurality of filter members 7 can be arranged in series over the entire length in the tunnel 2. A series of filter layers 6 composed of a plurality of filter members 7 can be constructed.

  In this case, the outer peripheral end of the partition wall 18 interposed between the adjacent filter members 7, 7 contacts the inner wall surface 3 of the tunnel 2, so that the outer peripheral surface of the filter member 7 and the inner wall surface 3 of the tunnel 2 are The gaps 4 formed therebetween are partitioned into a plurality in the longitudinal direction of the tunnel 2, and annular chambers 5 are formed between the adjacent partition walls 18 and 18, respectively.

  Then, after inserting the plurality of filter members 7 into the tunnel 2, the injection tube 11 provided in the recess 10 on the outer peripheral surface of the tube wall 8 of the plurality of filter members 7 is used, Each chamber 5 between the filter member 7 and the inner wall surface 3 of the tunnel 2 is filled with resin beads 20 that are granular, and each chamber 5 is filled with a predetermined amount of resin beads 20.

  In this way, the drain line 1 that communicates with the bank 25 on the bank side is constructed, and the water level of the river 25 is maintained at a predetermined water level via the drain line 1. Further, the groundwater penetrating from the river 25 to the embankment 26 passes through the pipe wall 8 of each filter member 7 of the filter layer 6 of the drain pipe 1 and is collected inside the filter layer 6, and passes through the drain pipe 1. Through the drainage channel 27. Further, the fine soil having a predetermined particle size or less passes through each filter member 7 of the filter layer 6, enters the inside of the filter member 7, and is pumped to the drainage channel 27 together with the water flowing inside the filter member 7. The Deposits deposited at the bottom of the tunnel 2 are prevented from moving downstream from that portion by the partition 18.

In the method of inserting the filter member according to the present embodiment configured as described above, the plurality of filter members 7 are fixed to the rope 21 inserted through them, and the plurality of filter members together with the rope 21 are attached. 7 is configured to be inserted into the tunnel 2, it is not necessary to form a groove in the ground when constructing the drain conduit 1.
Therefore, even when there is a building such as a private house in the bank of the dike 26, there is no need to drill the tunnel 2 around the building, so that the construction period can be shortened and the construction cost can be reduced. .

  Further, since the filter member 7 is made of a resin having a specific gravity of about 1.0, it can be inserted into the tunnel 2 in a floating state when groundwater penetrates into the tunnel 2, and resistance during insertion Can be made very small, and the insertion operation can be facilitated.

  Furthermore, since the resin beads 20 are filled in the gaps 4 between the filter member 7 and the inner wall surface 3 of the tunnel 2, the layer of the beads 20 can also function as a filter. It can be a double layer with the layer by the tube wall 8 of the member 7.

  Further, since the gaps 4 between the filter member 7 and the inner wall surface 3 of the tunnel 2 are partitioned into a plurality of chambers 5 by the partition walls 18, the resin beads 20 filled in each chamber 5 are provided in the downstream chambers. 5 and the sediment deposited on the bottom of each chamber 5 does not flow into the downstream chamber 5, and the filter member 7 is clogged by the deposit. There is nothing to wake up.

  Furthermore, since the pipe wall 8 of the filter member 7 slightly passes or includes the surrounding fine-grained soil, it can prevent clogging in the long term, and even in the ground where algae etc. are easy to grow. There is no clogging, and the filter function can be exhibited for a long time.

It is explanatory drawing which showed one Embodiment of the insertion method of the filter member by this invention, Comprising: It is explanatory drawing which showed the state after inserting a filter member in a drain pipe line. It is a partial expanded longitudinal cross-sectional view of a drain pipe line. It is a partial expanded cross-sectional view of a drain pipe line. It is a perspective view of a joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drain pipe line 2 Tunnel 3 Inner wall surface 4 Space | gap 5 Chamber 6 Filter layer 7 Filter member 8 Tube wall 9 Spacer 10 Concave part 11 Injection pipe 12 Joint 13 Main body part 14 Flange part 15 One half part 16 Other half part 17 Protrusion 18 Bulkhead 19 Bent part 20 Granular body 21 Rope 25 River 26 Embankment 27 Drainage channel

Claims (7)

A filter member insertion method for inserting a plurality of filter members into a tunnel drilled in the ground, and forming a filter layer with the plurality of filter members in the tunnel,
A rope is inserted inside the plurality of filter members, and each filter member is connected to the rope to form a bead shape. In this state, the rope and the plurality of filter members are inserted together in the tunnel, A method for inserting a filter member, comprising arranging a plurality of filter members over the entire length and constructing a series of filter layers comprising a plurality of filter members in a tunnel.   The method for inserting a filter member according to claim 1, wherein the filter member is a resin tubular member having a mesh-like tube wall.   A plurality of spacers projecting radially outward are integrally provided on the outer peripheral surface of the filter member, and the filter member is brought into contact with the inner wall surface of the tunnel so that the filter member is substantially in the center of the tunnel. The filter member insertion method according to claim 1, wherein the filter member is inserted into the filter member.   4. The joint according to claim 1, wherein a joint for integrally joining the adjacent filter members is interposed between the adjacent filter members, and the rope is connected to the joint. The method for inserting the filter member according to claim 1.   Between the adjacent filter members, a flange portion projecting annularly outward in the radial direction is interposed, and the outer peripheral end of the flange portion is brought into contact with the inner wall surface of the tunnel, so that the plurality of filter members and the tunnel are arranged. The method for inserting a filter member according to any one of 1 to 4, wherein a plurality of gaps formed between the inner wall surface and the inner wall surface of the filter member are partitioned in a longitudinal direction of the tunnel.   A bent portion that bends in one axial direction of the filter member is provided at an outer peripheral end portion of the flange portion, and the bent portion is brought into contact with an inner wall surface of the tunnel so that the inside of the tunnel of the filter member is 6. The method of inserting a filter member according to claim 5, wherein the movement of the filter member is prevented.   A concave portion is provided on the outer peripheral surface of each filter member over the entire length of each filter member, and an injection pipe for filling a granular material in a gap between the filter member and the tunnel is inserted into the concave portion. The filter member insertion method according to claim 1, wherein the filter member is inserted.

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