JP2007177488A - Permeable tube embedding method and work machine for use therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permeable tube embedding method which is applicable to a rainwater draining system, for embedding permeable tube safely and at a low cost, and to provide a work machine for use in the method. <P>SOLUTION: According to the permeable tube embedding method, after embedding a casing 10, a permeable sheet 20a is wound in the casing 10, and the permeable tube 20 is inserted into the casing, as shown in Fig. 1. Next, a core is inserted into a hollow portion in the permeable tube, and then sand is charged into a gap between the permeable tube and the casing 10. Further, after charging of the sand, the casing 10 is pulled up, and then the core is pulled up. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of burying a permeable pipe in a rainwater drainage system and a construction apparatus used therefor.

Conventionally, a vertical hole is dug to improve the ground by collecting rainwater and draining it underground or conversely draining groundwater from ground containing groundwater, and a porous permeation pipe is inserted into the vertical hole. Have been buried.
As a method of burying, for example, an excavator having a cutter is disposed inside the perforated pipe, the perforated pipe and the excavator are propelled by a main pushing device while excavating a natural ground, and the other part of the propelled perforated pipe is placed behind When the length of the propelled perforated pipe reaches the preset length, it is disposed inside. A method of burying a water distribution pipe is known in which a perforated pipe is left in the ground by pulling back an excavator and a sheath pipe, and a water permeable pipe is laid (see Patent Document 1).
However, in this burying method, since the permeable pipe is buried in direct contact with the natural ground, there is a risk of clogging or breakage during propulsion.

In addition, as another method, when embedding a permeation pipe wound with a permeation sheet, excavating the earth and sand with a backhoe, etc., and examining the embedding width and slope slope according to the self-supporting situation of the earth and sand is also known. However, in this burying method, when the permeation pipe becomes longer, the underground depth increases and the earth and sand collapse easily.
Therefore, it is necessary to widen the excavation width or make the slope of the slope gentle. However, in order to widen the excavation width or make the slope slope gentle, the site site must be large, and a large amount of excavated earth and sand is backfilled and used. In addition, a transportation means is also required. In this case, there may be an existing structure on the site, or the site may not be used in the first place.
Therefore, when there are restrictions on the work site, a method of installing earth retaining sheet piles or the like is employed.

  The earth retaining method has traditionally been a wooden sheet pile method, a simple construction method, a lightweight steel sheet pile method, a steel sheet pile method, an H steel sheet pile method, etc. First of all, the earth retaining sheet pile etc. is installed and then excavated, a permeation pipe (permeability pipe) is buried in the excavation hole, sand is poured around the permeation pipe, and then the earth retaining sheet pile etc. is pulled out. Has been implemented. However, in this process, it is necessary to pay close attention to the introduction of sand so that the permeation pipe is not eccentric or inclined after the permeation pipe is installed in the excavation hole.

In addition, the method of installing earth retaining sheet piles, etc. to embed a permeated pipe not only restricts the actions of workers because the drilling hole is narrow, but the work in the drilling hole is deficient in oxygen or There is a problem that poisonous gas is generated or stays and is very dangerous.
In this way, in the construction method in which earth retaining sheet piles etc. are installed to embed the permeated pipe, not only the installation of the earth retaining sheet pile etc. and pulling out and removal are necessary, but also the eccentricity and inclination of the permeated pipe. However, there is a problem that construction management for eliminating the cost is time consuming and labor intensive, and costs for the sheet piles and mechanical loss are associated with the installation and extraction of the retaining sheet piles.
JP-A-5-287726

  The present invention has been made in view of the above-mentioned problems associated with the conventional embedding of water-permeable pipes, and its purpose is to require installation of earth retaining sheet piles or the like as in the past even when the work site is limited. In addition, the eccentricity and inclination of the water permeable pipe are suppressed, and the water permeable pipe can be embedded at a safer and lower cost than in the past.

The invention of claim 1 is a method of burying a water permeable pipe, the step of burying a casing,
Discharging the earth and sand in the buried casing, inserting the water permeable sheet winding permeation pipe into the casing, and inserting a water permeable filler between the permeation pipe and the casing;
And a step of pulling out the casing after the water-permeable filler is charged.
According to a second aspect of the present invention, in the embedding method for a water permeable tube according to the first aspect, the step of pulling out the casing is pulled out by pulling up while swinging the casing.
The invention of claim 3 is the method of burying a permeable pipe according to claim 1 or 2, wherein after the osmotic pipe is buried, the permeable filler is prevented from entering the permeable pipe and the level of the permeable pipe is adjusted. Therefore, after inserting the core material having rigidity capable of applying pressure input to the bottom of the water permeable tube into the hollow portion of the osmotic tube, and inserting the water permeable filler, the core material is press-fitted and the water permeable tube is inserted. The method further comprises a step of adjusting the level of the step and a step of pulling up the core material.
According to a fourth aspect of the present invention, in the method of embedding a water permeable tube according to the third aspect, the core member covers a head portion of the permeation tube and a skirt-like cloth or the like is attached in the vicinity of the head portion to prevent sand from entering. It is characterized by that.
According to a fifth aspect of the present invention, in the method of embedding a water permeable tube according to any one of the first to fourth aspects, the water permeable tube is provided with a bottom positioning member that prevents eccentricity of the bottom when installed in the casing. It is characterized by having.
According to a sixth aspect of the present invention, in the method of burying a water permeable tube according to any one of the first to fifth aspects, the osmotic tube is a positioning member that prevents inclination of the osmotic tube and bending when the filler is charged. At an appropriate position in the longitudinal direction.
The invention of claim 7 is characterized in that the positioning member of the osmotic tube described in claim 5 or 6 is formed of a rib-like member having a pointed end with a tapered tip.
The invention of claim 8 is characterized in that in the method of burying a water permeable tube according to any one of claims 1 to 7, the water permeable filler is sand.
The invention of claim 9 is a self-propelled construction device used in the method of burying a water permeable tube according to any one of claims 1 to 8, and is a construction device for implementing the method of burying the water permeable tube. Excavating means, means for burying the casing while rotating the casing, means for lowering the permeation pipe in the buried casing, and inserting the core material into the lower permeation pipe and inserting the core material from the permeation pipe It has a means for pulling out and a means for pulling out the casing from the ground.

According to the present invention, a water permeable pipe can be embedded without using a soil retaining (Yamadome) sheet pile, a liner plate, or the like, and an operator can work without getting down into a digging hole. Therefore, there is no danger associated with oxygen deficiency or spring water in the excavation hole, collapse of the sheet pile due to earth pressure, and generation of underground gas, and work can be performed safely.
Since the permeable pipe is provided with a positioning guide, it prevents the permeable pipe from being offset, decentered, or tilted, and prevents sand from bending or tilting due to earth pressure during and after sand injection. it can.
Since the structure of each member required for construction is simplified, the permeable pipe can be embedded at low cost.

Before explaining the permeable tube embedding method of the present invention, first, the casing and the permeable tube will be described.
FIG. 1A is a sectional view of a casing, and FIG. 1B is a sectional view of a water permeable tube.
As shown in FIG. 1A, the casing 10 is a hollow circular pipe that is sufficiently longer than a buried permeation pipe made of concrete, iron-based material, or the like, and when the permeation pipe is buried, the permeation pipe is positioned and an excavation hole is provided. It functions as a retaining wall that supports the ground around.
As shown in FIG. 1B, the permeable pipe 20 is a synthetic resin pipe body having a mesh of a predetermined length, and is formed as a necessary length permeable pipe by connecting with a synthetic resin pipe joint such as vinyl chloride. Has been. Further, the water permeable sheet 20a is obtained by cutting a necessary size from a synthetic resin sheet such as a polyester long fiber nonwoven fabric, and is wound around the water permeable pipe with a packing tape or the like. Furthermore, the bottom cover provided with the bottom part positioning member is attached to the lower end of the water-permeable sheet winding water-permeable tube formed in this way. Only the positioning member can be attached to the lower end of the water permeable tube.

FIG. 2 shows a bottom cover attached to the lower end of the water permeable tube, FIG. 2A is a plan view thereof, and FIG. 2B is a side view thereof. The bottom cover 26 is a disk-shaped member made of, for example, an iron-based material having a circular water-permeable hole 27 in the center as shown in the figure, and has four arc-shaped members on its peripheral surface at regular intervals, here 90 ° intervals. A notch portion 28 is provided, and a rib-like bottom positioning member 24 having positioning guide portions projecting radially at 90 ° intervals is provided on the upper surface of the disk. A pair of support pieces 23 with bolt holes for bolting the lower end of the water permeable tube 20 wound with the water permeable sheet are provided with four pairs protruding at equal intervals around the water permeable holes 27, here at 90 ° intervals. Yes.
Here, the distal end portion of the positioning guide portion of the bottom positioning member can be easily inserted into the casing 10 to reduce resistance when the casing 10 rotates or swings in the forward / reverse direction and when it is pulled up. It is formed at an angled tip so that it can be prevented from rising.
The bottom lid 26 is tapered downward toward the water permeable hole 27 of the bottom lid, and the notch portion 28 is provided around the bottom lid to improve its penetration capability.

  FIG. 3 is a cross-sectional view showing a state in which the permeable tube 20 is attached to the bottom lid 26. As shown in the drawing, the lower end of the water permeable tube 20 around which the sheet 20a is wound is inserted between a pair of support pieces 23 each provided with a bolt grooved hole 23a. The bolt B is inserted and integrated with the bolt through hole 23b.

As already described, only the positioning member may be provided without providing the bottom cover 26 at the lower end of the permeable pipe.
FIG. 4 shows this embodiment about the structure of the lower end part of the water permeable tube 20, FIG. 4A is the sectional side view, FIG. 4B is the top view seen from the AA arrow of FIG. 4A.
In the present embodiment, the bottom positioning member 24 ′ is formed in a cross shape in plan view made of, for example, an iron-based material as shown in FIG. 4B, and the bottom positioning member 24 ′ is formed on the bottom positioning member 24 ′ as shown in FIG. 4A. A cross-sectional concave member 23 ′ that fits the lower end of the water-permeable tube 20 wound with a water-permeable sheet is welded and integrated, and the bottom cover is not used.

5 shows the intermediate positioning member 22 of the water permeable tube 20, FIG. 5A is a plan view thereof, and FIG. 5B is a side view thereof.
The intermediate positioning member 22 is made of, for example, an iron-based material, and has an annular portion that is inserted by a known means such as inserting the water permeable tube 20 and tightening the peripheral surface of the water permeable tube 20 as shown in the figure, and the radius from the annular portion It consists of a positioning guide portion 22a projecting outward in the direction. The tip of the positioning guide portion 22a is formed at an angled tip for preventing the sand from rising together, as in the bottom positioning member. Here, since the guide portion 22a of the intermediate positioning member 22 and the positioning guide portion 24a of the bottom lid 22 are both formed in a reinforcing plate shape, that is, in a rib shape, the structure is simple and the permeable tube 20 by the pressure of the rod is reduced. In addition to being able to withstand the pressurization at the time of level adjustment, a space between the outer periphery of the water permeable tube 12 and the inner periphery of the casing can be increased, and the permeation ability can be improved.

Next, the embedding method of the permeable tube 20 described above will be described.
FIG. 6A is a diagram illustrating a process of burying the casing 10 performed prior to burying the water permeable pipe 20.
First, an auger screw 12 and a casing auger are attached to a construction machine, for example, a pile driving machine, and the auger screw is inserted into the ground by the attached rotary drive device to perform pre-boring, and then the casing device. The casing 10 held in the above is stood on the ground, an auger screw 12 is inserted into the casing 10, and the casing 10 and the auger screw 12 are rotated in opposite directions by the rotary drive device attached to the pile driving machine. Start drilling. At that time, the lower end of the casing 10 enters the ground while excavating around the hole excavated by the auger screw 12, and the excavated earth and sand in the casing 10 is discharged by the auger screw 12. In addition, it is preferable that the lower end of the casing 10 is formed in the sawtooth-shaped uneven surface so that it may be convenient for excavation.

  FIG. 6B shows a state where excavation of the auger screw 12 and the casing 10 is completed. The casing 10 is checked by measuring the depth in the casing 10 to determine whether it has reached a predetermined depth for embedding the water permeable pipe. When the depth reaches the design value as a result of the confirmation, the excavation is stopped.

  Subsequently, the auger screw 12 is pulled up as shown in FIG. 6C. The auger screw 12 is pulled up while rotating in the direction opposite to the excavation direction as shown in the figure, and as a result, only the casing 10 is left in the ground with the inside being hollow as shown in FIG. 6D.

Subsequently, as shown in FIG. 7A, crushed stone C serving as the foundation of the permeable pipe is put into a casing 10 erected in the ground. The crushed stone C is scooped up with a bucket of a construction machine, for example, and accumulated in the casing 10 to a predetermined thickness.
FIG. 7B shows a process of suspending and inserting the bottom lid 26 and the permeation pipe 20 with the intermediate positioning member 22 into the casing 10 shown in FIG. 7A with a crane.
FIG. 8 shows a state where the water permeable tube 20 is installed in the casing 10. In the casing 10, the permeation hole 26 a of the bottom lid 26 is placed on the crushed stone C in the casing 10, and the bottom portion and the middle portion are substantially concentric with the casing 10 by the intermediate positioning member 22 and the bottom portion positioning member 24. Positioned.
Accordingly, the water permeable tube 20 is arranged upright with respect to the ground in the casing 10.

FIG. 9 shows a step of inserting the rod 30 serving as the core material into the inside from the upper opening of the water permeable tube 20 positioned in the casing 10 in this way.
Here, the rod 30 is a pipe made of, for example, an iron-based material, and is inserted into the water permeable tube 20 as illustrated. The rod 30 is covered with a shell-shaped cap 32a so that the sand does not enter the rod 30 when a water-permeable filler such as sand is introduced into the casing 10.
For example, a cloth skirt-like member 32b is attached to a boundary portion between the rod 30 and the water permeable tube 20, that is, in the vicinity of the rod head. When the rod 30 is inserted into the water permeable tube 20, the skirt-like member 32b When the sand is introduced from above, the sand is prevented from entering the water-permeable tube 20 through the gap between the water-permeable tube 20 and the rod 30.
Since the skirt-like portion 32b is made of cloth, even if the skirt-like portion 32b is detached by a strong wind or the like when the rod is suspended, no personal injury is caused.

FIG. 10 shows a step of throwing sand between the water permeable tube 20 and the casing 10 with the rod 30 inserted into the water permeable tube 20.
For example, when sand accumulated in the bucket 14 is scooped up and put into the casing 10, the sand falls into the casing 10 from around the cap 32 a at the head of the rod 30. At this time, the sand around the rod 30 does not enter the water permeable tube 20 by the skirt-like portion 32b.

FIG. 11 shows a process in which sand is poured into the casing 10 and then pulled out by applying forward / reverse rotation to the casing 10.
In this case, when the casing 10 is pulled out at random, a moving force acts on the sand on the outer periphery of the water permeable tube 20 along with the pulling out, so that a so-called co-up phenomenon occurs in which the sand is pulled up together with the water permeable tube 20. Therefore, in the present embodiment, the casing 10 is gradually swung in the forward / reverse rotation direction and pulled out.

FIG. 12 shows a construction machine for this purpose. As shown in the drawing, the construction machine 40 includes a casing 10 tightening 44a, a left / right swinging jack 44, and a lifting jack 44b that constitute a swinging device 44 for pulling out the casing in front and below.
The casing 10 is pulled out by tightening the casing 10 with a fastening jack 44a of a swinging device 44 attached to the construction machine 40, and further gradually rotating the casing 10 forward and backward with a left and right swinging jack 44c and a lifting jack 44b. Perform while swinging in the direction. Thereby, the circumferential frictional force of the outer periphery of the casing 10 and the inner periphery of the casing can be temporarily cut to prevent the sand from rising together.
It is preferable that the construction machine 40 is small and has a low height so as not to disturb the electric wire and the telephone line, and can be self-propelled by mounting an auger screw or a casing auger.

FIG. 13 shows the arrangement of the water permeable tubes 20 in a state where the casing 10 is pulled out.
In this state, the rod 30 is still left in the water permeable tube 20.
In this state, when the head of the rod 30 protruding from the water permeable tube 20 is pressed, the lower end of the rod 30 pushes the upper surface of the bottom lid 26 of the water permeable tube 20 and the level of the water permeable tube 20 can be adjusted. In this case, since the water permeable pipe 20 itself is generally a synthetic resin pipe, the pipe may be crushed when directly pressurized, but in this embodiment, the rod 30 made of a rigid iron-based material is press-fitted. Since the pressure is applied to the bottom cover 26 made of, for example, an iron-based material, the water-permeable tube 20 is not broken.
The rod 30 inserted into the hollow portion of the osmotic tube 10 is not only used to press-fit from the head of the rod 30 in this way to accurately adjust the osmotic tube level (top end), but also at the tip of the osmotic tube. It also serves to confirm the depth position of the part and prevent lifting due to buoyancy.

FIG. 14A shows a process of pulling up the rod 30 after adjusting the level of the water permeable tube 20. FIG. 14B shows a state in which the water permeable tube 20 is correctly arranged in the ground in this way.
As described above, according to the method for embedding a water permeable tube according to the present invention, the water permeable tube can be safely and securely embedded while positioning the water permeable tube in a limited construction area with a simple configuration. Therefore, it is possible to embed a large number of water permeable pipes quickly and accurately at low cost.
In the above description, the permeation pipe provided with the bottom cover has been described as an example. However, a structure in which the bottom cover is not attached to the bottom of the permeation pipe can be embedded similarly.

It is a longitudinal cross-sectional view of the casing which concerns on embodiment of this invention, and a water permeable tube. The bottom cover attached to the lower end of a permeable pipe is shown, FIG. 2A is the top view, and FIG. 2B is a side view. It is sectional drawing which shows the state which attached the water permeable pipe to the bottom cover with a position control guide. FIG. 4A is a sectional side view thereof, and FIG. 4B is a plan view as viewed in the direction of arrows AA in FIG. 4A. FIG. 5A is a plan view and FIG. 5B is a side view of the intermediate positioning member of the water permeable tube. FIG. 6A to FIG. 6D are views showing a casing embedding process performed prior to embedding the water permeable pipe. FIG. 7A shows a step of throwing crushed stone into a casing embedded in the ground, and FIG. 7B shows a step of inserting a permeation tube into the casing. The state which installed the said permeable pipe in the casing is shown. The process which inserts a rod from the upper opening of the water permeable pipe in a casing is shown. The process of throwing sand between the water permeable tube and the casing with the rod inserted into the water permeable tube is shown. The figure shows a step of drawing the sand by putting forward and reverse rotation into the casing after sand is put into the casing. The construction apparatus for implementing the process shown in FIG. 11 is shown. The arrangement | positioning of the water-permeable tube in the state which pulled out the casing is shown. FIG. 14A shows a process of pulling out the rod, and FIG. 14B shows a state in which the permeable pipe is correctly arranged in the ground in this way.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Casing, 20 ... Permeable pipe, 20a ... Permeable sheet, 22 ... Intermediate positioning member, 24, 24 '... Bottom positioning member, 26 ... Bottom lid, 30 ... Rod (core material), 40 ... construction equipment.

Claims (9)

Burying the casing;
Discharging the earth and sand in the buried casing and inserting the water-permeable sheet winding permeation pipe into the casing;
Introducing a water-permeable filler between the permeation tube and the casing;
Extracting the casing after charging the water-permeable filler;
A method for embedding a water permeable tube, comprising: In the construction method of the permeable pipe described in claim 1,
The step of pulling out the casing is pulled out by pulling up while swinging the casing. In the method of burying a water permeable tube according to claim 1 or 2,
After embedding the osmotic tube, a hollow core portion of the osmotic tube is made of a rigid core material that can prevent pressure penetration of the permeable tube and adjust the level of the permeable tube. Inserting into,
After the charging step of the water-permeable filler, a step of press-fitting the core material and adjusting the level of the water-permeable tube;
A step of pulling up the core material;
A method of burying a permeable pipe, further comprising: In the embedding method of the permeable pipe according to claim 3,
The core material is provided with a skirt-like cloth member in the vicinity of the head portion so as to cover the head portion of the permeation tube and prevent sand from entering. In the embedment method of the permeable pipe according to any one of claims 1 to 4,
The permeation pipe embedding method, wherein the permeation pipe has a bottom positioning member that prevents eccentricity of the bottom when the permeation pipe is installed in the casing. In the embedment method of the permeable pipe according to any one of claims 1 to 5,
The osmotic tube embedding method, wherein the osmotic tube has a positioning member at an appropriate position in the longitudinal direction for preventing the inclination of the osmotic tube and bending at the time of charging the filler.   7. The osmotic tube embedment method according to claim 5, wherein the osmotic tube positioning member is formed of a rib-like member having a tip portion with a tapered tip portion. In the embedding method of the water permeable tube according to any one of claims 1 to 7,
The permeable pipe embedding method, wherein the water permeable filler is sand.   A self-propelled construction device used in the permeable tube burying method according to any one of claims 1 to 8, wherein the construction device implements the method of burying the permeable tube, Means for burying the casing while rotating it; means for lowering the permeation pipe in the buried casing; means for inserting a core material into the lower permeation pipe and extracting the core material from the permeation pipe; and the casing A self-propelled construction device characterized by comprising means for pulling out the ground from the ground.

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