JP3513697B2 - Non-cutting propulsion piping method - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a gas pipe in the ground,
The present invention relates to a non-open cutting propulsion piping method for laying water pipes and other long pipes.

[0002]

2. Description of the Related Art In recent years, there has been known a non-excavation propulsion method called, for example, flow molding (TM), which does not require excavation of the ground along a pipe route when burying a long pipe. In this type of construction method, first, a rod is pushed in the ground from one starting pit to the other reaching pit. The water is sprayed from the tip of the rod to soften the soil, while the propulsion device installed in the starting pit forces the rod to be pushed underground.

When the tip of the rod reaches the reaching pit, one end of the long pipe is connected inside the reaching pit, and the long pipe is pulled into the ground. By retracting the rod, a pore having a diameter corresponding to that of the rod is formed in the ground, and the long tube returns along the pore. When performing the work of pulling in the rod, an expanded reamer having a diameter slightly larger than that of the long tube is attached to one end of the long tube. This diameter-expanding reamer has a roughly conical shape that is sharp in the pulling-out direction.
The resistance that acts on the long tube during the drawing operation is reduced.

[0004]

However, in such a conventional technique, at the stage of retracting the long tube,
Since the diameter expansion reamer with a diameter larger than that of a long pipe forcibly expands the pores in the ground, in some cases, the soil pushed up by the diameter expansion reamer may cause the ground surface to rise. . In particular, when a stone pavement or the like is laid on the ground surface, the effect is serious in the case of the shallow burial method in which pipes are installed at a shallow position.

The present invention has been made by paying attention to such a conventional technique, and provides a non-open cutting propulsion piping method which does not affect the ground surface.

[0006]

A non-excavation propulsion piping method according to the present invention is a non-excavation propulsion piping method in which a long pipe is laid between a starting pit formed at a predetermined depth and a reaching pit,
Push the rod in the ground from the starting pit to the arrival pit,
Connect one end of a roughly cylindrical scoop body having a diameter approximately corresponding to a long pipe and an opening on the side surface to the tip of the rod reaching the reaching shaft side, and then pulling in the rod to ground the scoop body. To make it bite inside, repeat the work of pushing the rod back into the reaching pit and returning the scoop body to discharge the soil inside, and between the reaching pit and the starting pit, make a pilot hole corresponding to the diameter of the scoop body. After forming a rod, send a rod from the starting hole to the reaching hole through the pilot hole, connect one end of the long tube to the tip of the rod on the reaching hole side, and then pull in the rod to put the long tube in the pilot hole. Is to be laid.

That is, although pushing the rod once to the reaching shaft is similar to the conventional method, in the present invention, after pushing the rod to the reaching shaft side, immediately after pulling the long tube with the rod, the rod is roughly pulled into the rod. By connecting a cylindrical scoop body and pushing and pulling the rod, this scoop body is bitten into the ground from the side wall of the reaching pit, and while holding the soil inside the scoop body, take out to the reaching pit side one by one. The soil inside the scoop is discharged. By repeating this, it is possible to form a pilot hole having a diameter suitable for the scoop body toward the launch pit. Unlike the conventional method, the hole for piping a long pipe is not forcedly expanded, but it is dug once by a scoop body,
The ground surface does not rise.

The rod is again passed through the pilot hole formed by the repeated work of the scoop body toward the reaching pit side. Then, the long tube is connected to the rod and the rod is pulled in, whereby the long tube is piped into the pilot hole. Since the diameters of the pilot hole and the long tube are almost the same,
There is little resistance when pulling in a long tube. Either a resin pipe or a steel pipe may be used as the long pipe piped in the pilot hole. Here, "starting pit" and "reaching pit" mean the entrance side and the exit side in one work unit, and the starting point when laying long pipes continuously. And does not mean the end point. Therefore, the starting pit in one work becomes the arrival pit in the next work, and one long pipe can be continuously piped through the plurality of pilot holes.

If the opening formed on the side surface of the scoop body has a shape capable of discharging the soil held inside the scoop body,
Any shape is acceptable. Further, the scoop body can be formed by utilizing the waste material of the pipe. By forming a pair of openings facing each other on the side surface of the scoop body, pushing the construction tool such as a shovel or pickaxe through one opening allows the soil inside the scoop body to be discharged from the opening on the opposite side. . The soil inside can be discharged from the end of the scoop body.

Further, as a method of discharging the soil from the scoop body, not only the soil is pushed out or knocked down from the scoop body, but the scoop body containing the soil taken out to the reaching pit side is replaced with an empty scoop body. As a result, the soil may be discharged from the scoop body. Alternatively, the scoop body may be slid with respect to the rod so that the inside of the scoop body is exposed and then the scoop body is knocked off. Further, a screw auger may be provided inside the scoop body, and the screw auger may be rotated to forcibly discharge the soil in the scoop body.

At one end of the scoop body, a socket portion for connecting the tip of the rod can be supported without impeding the ingress of soil. For example, the socket portion for rod connection may be supported at the center of one end of the scoop body via a plurality of ribs arranged radially from the center. The rib preferably has a cross-sectional shape with low resistance to soil, preferably a rod shape or a thin plate shape, and more preferably a sharp cross-sectional shape in the pulling direction.

Further, it is preferable from the aspect of shape retention of the scoop body to provide a plurality of ribs radially arranged from the center also on the other end of the scoop body. Then, if the socket portion at one end of the scoop body and the center of the rib at the other end are connected by the center shaft inside the scoop body, the pulling force from the rod can be transmitted to the other end side of the scoop body. Therefore, stress concentration on the socket portion can be avoided. Also,
If another socket is provided at the center of the rib on the other end of the scoop, a two-stage structure can be formed in which another scoop is connected.

The rod can be a rod or a tube which can be continuously connected and extended. When this rod is also formed into a tubular shape, it can be formed by using the waste material of the pipe. A head for injecting water may be provided at the tip of the rod as in the conventional case. If the rod is made tubular and thick, the hole initially formed by the rod becomes thick, and then the operation of forming the pilot hole with the scoop body becomes easier. Also, if the rod is made tubular and thick, when the rod is pushed in, the soil will also enter the inside of the rod.Therefore, water injection means or sediment suction means should be provided inside the rod to enter the rod. You may make it discharge the soil. Further, a screw auger may be inserted inside the tubular rod to scrape out the soil inside, or an extrusion rod may be inserted to discharge the soil from the tip of the tubular rod that has reached the reaching pit side. Furthermore, if the tip of the tubular rod is made sharp, the rod can be more easily propelled.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

1 to 15 are views showing a first embodiment of the present invention. In this embodiment, a construction method in one work unit will be described. A starting pit 1 and a reaching pit 2 each having a predetermined depth are formed on the ground with a predetermined distance therebetween.
A propulsion device 3 is installed in the start pit 1. This propulsion machine 3
Is to apply a propulsive force in a fixed direction by engaging with the rod-shaped rod 4. The rod-shaped rods 4 can be extended in any length by continuously connecting in the starting shaft 1. A known head (not shown) capable of jetting water is attached to the tip of the rod 4.

First, the structure of the propulsion unit 3 will be described. As the propulsion unit 3, the one shown in FIGS. 14 and 15 was used. That is, two cylinders 7 that expand and contract by the injection of oil are provided between the pair of plates 5 and 6, and the distance between the plates 5 and 6 is variable. Further, one plate 5 is formed with two large and small tapered holes 8 and 9 which are continuous in opposite directions to each other, and three-divided chucks 10 and 11 each having a side surface matching the tapered holes 8 and 9 are formed therein. It is designed to fit in. These chucks 10, 11
Has only one divided part unconnected, and the other parts are rotatably connected by a joint not shown. Further, a pair of pins 12 and 13 are formed so as to sandwich the unconnected divided portions of the chucks 10 and 11, and the chucks 10 and 11 can be expanded by holding the pins 12 and 13. A through hole 14 is formed in the other plate 6. The plate 6 on the other side is a fixed side, and the one plate 5 is a movable side by the cylinder 7.

Therefore, after the rod 4 is passed through the tapered holes 8 and 9 and the through hole 14, the larger chuck 10 is wound around the rod 4 and then fitted into the corresponding larger tapered hole 8 to form two rods. If the cylinder 7 is extended, the rod 44
You can press. On the contrary, the smaller chuck 11 is fitted into the corresponding smaller tapered hole 9, and
When the book cylinder 7 is contracted, the rod 4 can be pulled. Therefore, the rods 4 can be pushed and pulled by alternately fitting the chucks 10 and 11 into the corresponding tapered holes 8 and 9. These large and small chucks 10, 1
1 can be loosely installed in the tapered holes 8 and 9 in advance, and only the chuck 10 to be selected can be firmly fitted into the corresponding tapered holes 8 and 9 by the known lever mechanism. By doing so, pushing and pulling of the rod 4 can be switched by the lever operation.

In this propulsion device 3, since the contact area between the chucks 10 and 11 and the rod 4 is large, the rod 4 will not be crushed even if it is formed into a hollow pipe shape. When pushing and pulling the rod 4, the force in the pulling direction using the small chuck 11 is smaller than the force in the pushing direction using the large chuck 10. This is because the smaller chuck 11 has a smaller contact area with the rod 4.

Such a propulsion device 3 can be fixed by changing its direction by a dedicated support tool. Therefore, when a large force is required in the pushing direction, one of the movable plates 5 is directed in that direction, and when a large force is required in the pulling direction, the plate 5 is fixed in the opposite direction.

The propulsion device 3 is installed in the starting pit 1 with the movable plate 5 facing the reaching pit 2 side, and the larger chuck 10 is fitted into the corresponding tapered hole 8, By extending the cylinder 7, the rod 4
push. The rod 4 is pushed into the ground from the side wall of the starting shaft 1 by the propulsion device 3 (FIG. 1). Then, the continuous pushing by the propulsion unit 3 is further advanced, and the tip of the rod 4 reaches the reaching pit 2 (FIG. 2). A head (not shown) for injecting water is removed from the tip of the rod 4 protruding into the reaching shaft 2, and a scoop body 5 is attached instead of the head (not shown) (FIG. 3).

As shown in FIG. 11, the scoop body 5 has a substantially cylindrical shape and has a diameter corresponding to a long tube 16 described later. The scoop body 15 is manufactured by cutting a waste steel pipe into a predetermined length and then processing the steel pipe. In this embodiment, the scoop body 1
A large opening 17 is formed on the side surface of No. 5 so as to face each other. A cross-shaped (radial) rib 18 is formed at one end of the scoop body 15, and the socket portion 19 is supported at the center thereof. A female screw is formed on the inner surface of the socket portion 19 so that a male screw formed at the tip of the rod 4 can be screwed. Also, the rib 18
Has a pentagonal cross section on the side (retracting side) to which the rod 4 is connected. The edge of the scoop body 15 on the one end side may be sharpened.

On the other end side of the scoop body 15 are also formed two linearly (radially) ribs 20, and another socket 21 is supported at the center of the rib 20. . The socket portion 21 is for allowing another scoop body to be arranged in two stages in succession to the scoop body 15. Further, inside the scoop body 15, the socket portion 19 on one side and the socket portion 21 on the other side are connected by a cylindrical center shaft 22. The ribs 18 and 20 on both ends of the scoop body 15 are connected to the socket portions 19 and 2, respectively.
In addition to supporting 1, the scoop body 15 has a function of maintaining its shape.

After connecting such a socket 19 to the tip of the rod 4, the direction of the propulsion device 3 is changed, the cylinder 7 is extended and the rod 4 is pulled in (the direction of the propulsion device 3 is changed only once. ). Then, the scoop body 15 bites into the side wall of the reaching pit 2, and the soil enters into the scoop body 15 and is retained therein (FIG. 4). When the scoop body 15 is bited into the ground, the rib 18 at one end of the scoop body 15
Since it has a sharp shape, there is little resistance. Further, since the socket portions 19 and 21 at both ends of the scoop body 15 are connected by the center shaft 22, it is possible to prevent the pulling force of the rod 4 from being concentrated only on the socket portion 19 at one end portion.

After scooping the scoop body 15 into the ground,
In the propulsion device 3, the smaller chuck 11 is fitted into the corresponding tapered hole 9, the cylinder 7 is contracted, and the rod 4 is pushed again (since the propulsion device 3 has been changed once, in this case, "push"). Become). When the rod 4 is pushed, the scoop body 15 returns to the reaching pit 2 side, so that the soil inside the scoop body 15 is discharged in the reaching pit 2 (FIG. 5). Since the openings 17 of the scoop body 15 are formed so as to face each other, by pushing a construction tool such as a shovel or a pickaxe through the opening 17 on one side, the opening 17 on the other side is opened.
It is possible to discharge the soil in the scoop body 15.
The soil inside can be discharged from both ends of the scoop body 15.

After the soil has been discharged from the scoop body 15, the rod 4 is pulled back again and cut into the ground (FIG. 6).
Then, the rod 4 is pushed in again to return the scoop body 5 to the reaching pit 2 and the soil is discharged from the scoop body 15 (FIG. 7). The above operation is repeated to form the pilot hole P having a diameter corresponding to the scoop body 15 from the reaching pit 2 to the starting pit 1 (FIG. 8).

Next, the rod 4 is sent to the reaching hole 2 side through the pilot hole P, and one end of the long pipe 16 which is a resin pipe or a steel pipe for gas is connected to the tip of the rod 4 (FIG. 9). . A towing head (not shown) that enables connection of the rod 4 is attached to the tip of the long tube 16. Then, the long pipe 16 is pulled in as it is, and is piped into the pilot hole P (FIG. 10). Since the diameter of the pilot hole P and the diameter of the long tube 16 substantially correspond to each other, the resistance when pulling in the long tube 16 is small. When pulling the long tube 16 into the pilot hole P, it is preferable to apply soap water as a lubricant to the surface of the long tube 16. As described above, the piping work in one work unit is completed, and the long pipes 16 can be continuously laid by connecting the long pipes 16 while repeating this work.

According to this embodiment, instead of forcibly expanding the hole for piping the long pipe 16 as in the conventional case, the scoop body 15 is used to dig one by one to form the long pipe 16. In order to form a pilot hole P having a suitable diameter,
The ground surface does not rise.

FIG. 16 is a diagram showing a second embodiment of the present invention. This embodiment relates to a scoop body 23 that facilitates soil discharge. In the scoop body 23 according to this embodiment, the outer cylinder portion is slidable with respect to the center shaft 22 via a stopper mechanism (not shown). Therefore, by holding the soil inside the scoop body 23 and then sliding the scoop body 23 to expose the soil inside, the soil can be easily discharged.

FIG. 17 is a diagram showing a third embodiment of the present invention. This embodiment also relates to the scoop body 24 that facilitates soil discharge. The scoop body 24 according to this embodiment has a center shaft 22 provided therein.
The screw auger 23 is integrally formed on the screw auger 23 by rotating the rod 4.
Is rotatable relative to the outer cylinder portion of the scoop body 24. Therefore, when the screw auger 23 is rotated after holding the soil inside the scoop body 24, the soil inside is scooped out.

18 to 20 are views showing a fourth embodiment of the present invention. In this embodiment, a thick cylindrical rod 26 is used, and its tip is sharpened. Further, a water jetting means 27 is provided inside the rod 26, and excavation teeth 28 for breaking down soil are formed at the tip thereof.

Next, when actually working, the cylindrical rod 26 is first pushed into the ground by the propulsion unit 29. The propulsion unit 29 has a chuck or the like larger than that of the propulsion unit 3 of the first embodiment so as to hold the cylindrical rod 26 having a large diameter. Further, since the tip of the rod 26 is sharp, the resistance of soil can be reduced. Further, because of the cylindrical shape, the soil enters the inside of the rod 26, but the soil that has entered the rod 26 is sprayed with water from the water jetting means 27 while applying the excavating teeth 28 to collapse the soil. By injecting, it is possible to flow out to the side of the starting shaft 1 through the inside of the rod 26.

After pushing this rod 26 into the reaching pit 2 as in the previous embodiment, the scoop body 15 is connected to the tip of the rod 26, and the scoop body 15 is used to repeatedly excavate the soil to form the scoop body 15. A pilot hole P having a corresponding diameter can be formed. When excavating the soil with the scoop body 15, since the rod 26 is tubular and thick, the scoop body 15 scrapes away the soil corresponding to the diameter difference d (FIG. 19) from the rod 26 and holds it inside. Therefore, less force is required to pull in the scoop body 15 than in the previous embodiment. After forming the pilot hole P, the long pipe 16 may be piped in the pilot hole P in the same manner as described above.

FIG. 21 is a diagram showing a fifth embodiment of the present invention. This embodiment relates to another structure for discharging the soil in the rod 26. In this embodiment, earth and sand suction means 30 is provided inside the rod 26 of the fourth embodiment instead of the water injection means. This earth and sand suction means 3
A drill tooth 28 is also provided at the tip of 0. According to the earth and sand suction means 30, the earth and sand that have entered the rod 26 can be sucked and removed toward the start pit 1 side.

FIG. 22 is a diagram showing a sixth embodiment of the present invention. This embodiment also relates to another structure for discharging the soil in the rod 26. The screw auger 31 is inserted into the rod 26 while rotating, and the soil in the rod 26 can be scraped out and discharged by the screw auger 31.

FIG. 23 is a diagram showing a seventh embodiment of the present invention. This embodiment also relates to another structure for discharging the soil in the rod 26. After the extruding rod 26 substantially corresponding to the inner diameter of the rod 26 is inserted into the rod 26 and the tip of the cylindrical rod 26 reaches the reaching pit 2, the soil in the rod 26 is pushed by the pushing rod 32 to the reaching pit 2 side. Can be pushed to.

[0036]

According to the present invention, unlike the conventional case, the hole for piping the long pipe is not forcibly expanded, and the scoop body digs one by one to advance the diameter corresponding to the long pipe. Since the pilot hole of is formed, the ground surface does not rise.

[Brief description of drawings]

FIG. 1 is an underground cross-sectional view showing a first state in which a rod is pushed in in the non-open cutting propulsion piping method according to the first embodiment of the present invention.

FIG. 2 is a sectional view in the ground showing a state in which the rod is pushed into the reaching shaft.

FIG. 3 is a sectional view in the ground showing a state where a scoop body is connected to the tip of the rod.

FIG. 4 is an underground cross-sectional view showing a state in which the scoop body is first bited into the ground.

FIG. 5 is an underground cross-sectional view showing a state in which the scoop body is returned to the reaching shaft to remove the soil in the scoop body.

FIG. 6 is a sectional view in the ground showing a state in which the scoop body is bited into the ground again.

FIG. 7 is an underground cross-sectional view showing a state in which the scoop body is returned to the reaching shaft again to remove the soil in the scoop body.

FIG. 8 is an underground cross-sectional view showing a state where the scoop body has dug to the start pit.

FIG. 9 is a sectional view in the ground showing a state in which a long tube is connected to the tip of a rod passed through a pilot hole.

FIG. 10 is a sectional view in the ground showing a state where a long pipe is piped in a pilot hole.

FIG. 11 is a perspective view showing a scoop body.

FIG. 12 is a cross-sectional view taken along the line SA-SA shown in FIG.

FIG. 13 is a cross-sectional view showing a state where soil is held in the scoop body.

FIG. 14 is a perspective view showing a propulsion device.

FIG. 15 is a sectional view taken along the line SB-SB shown in FIG.

FIG. 16 is a sectional view showing a scoop body according to a second embodiment.

FIG. 17 is a sectional view showing a scoop body according to a third embodiment.

FIG. 18 is a sectional view in the ground showing a first state in which the rod is pushed in in the non-excavation propulsion piping method according to the fourth embodiment.

FIG. 19 is a sectional view in the ground showing a state in which the rod is pushed to the reaching pit and the scoop body is connected to the tip thereof.

FIG. 20 is a cross-sectional view showing a rod provided with water injection means inside.

FIG. 21 is a cross-sectional view showing a rod in which the earth and sand suction means of the fifth embodiment is provided.

FIG. 22 is a sectional view showing a rod having a screw auger according to a sixth embodiment provided therein.

FIG. 23 is a cross-sectional view showing a rod provided inside with an extruding rod according to a seventh embodiment.

[Explanation of symbols]

1 start pit 2 reaching pit 3,29 propulsion machine 4 rods 15, 23, 24 scoop 16 long tube 17 openings 18, 20 ribs 19, 21 Socket part 22 Center axis 27 Water injection means 30 Sediment suction means 25, 31 screw auger 26 Rod (Tubular) 32 Extruded rod P pilot hole

Front page continuation (72) Inventor Shinji Sanwa 3-16-2 Minamigai, Higashiyamato-shi, Tokyo (72) Inventor Akira Takaki 236-24 Nakabogamigaoka, Asahi-ku, Yokohama-shi, Kanagawa (56) References 10-61378 (JP, A) JP 11-6395 (JP, A) JP 50-147110 (JP, A) JP 60-261833 (JP, A) Actual 57-168593 JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/06 E21D 9/12

Claims (15)

(57) [Claims] 1. A non-excavation propulsion piping method in which a long pipe is laid between a starting pit formed at a predetermined depth and a reaching pit, wherein a rod is pushed in the ground from the starting pit to the reaching pit,
Connect one end of a roughly cylindrical scoop body having a diameter approximately corresponding to a long pipe and an opening on the side surface to the tip of the rod that reached the reaching shaft side, and then pull in the rod to ground the scoop body. To make it bite inside, repeat the work of pushing the rod back into the reaching pit and returning the scoop body to discharge the soil inside, and between the reaching pit and the starting pit, make a pilot hole corresponding to the diameter of the scoop body. After forming the rod, send the rod from the starting hole to the reaching hole through the pilot hole, connect one end of the long tube to the tip of the rod on the reaching hole side, and then pull in the rod to move the long tube into the pilot hole. Non-excavation propulsion piping method characterized by being installed in 2. The non-open cutting propulsion piping method according to claim 1, wherein a pair of openings are formed on a side surface of the scoop body so as to face each other. 3. The non-cutting tool according to claim 1, wherein a socket portion for connecting a rod is supported at the center of one end of the scoop body via a plurality of ribs radially arranged from the center. Propulsion piping method. 4. The non-cutting propulsion piping method according to claim 3, wherein the rib has a cross-sectional shape that is sharp in the pull-in direction. 5. A plurality of ribs arranged radially from the center are also provided at the center of the other end of the scoop body, and the centers of the socket portion at one end and the ribs at the other end are centered inside the scoop body. The non-open cutting propulsion piping method according to claim 3 or 4, wherein the non-open cutting propulsion piping method is connected by a shaft. 6. The non-cutting propulsion piping method according to claim 5, wherein a socket portion for connecting another scoop body is provided at the center of the rib at the other end of the scoop body. 7. The non-cutting propulsion piping method according to claim 5, wherein the scoop body is slidable with respect to the center shaft. 8. The non-cutting propulsion piping method according to claim 5, wherein the center shaft is rotatable and a screw auger is integrally formed on the center shaft. 9. The non-cutting propulsion piping method according to claim 1, wherein the rod has a rod shape. 10. The non-cutting propulsion piping method according to any one of claims 1 to 8, wherein the rod is in a pipe state. 11. The non-cutting propulsion piping method according to claim 10, wherein the tip of the rod is sharpened. 12. The non-excavation propulsion piping method according to claim 10 or 11, wherein water injection means for discharging soil is provided inside the rod. 13. The non-excavation propulsion piping method according to claim 10 or 11, wherein earth / sand suction means for discharging soil is provided inside the rod. 14. The non-excavation propulsion piping method according to claim 10 or 11, wherein a screw auger is inserted into the rod to discharge the soil inside the rod. 15. The non-excavation propulsion piping method according to claim 10 or 11, wherein an extruding rod is inserted into the rod, and the soil inside the rod is discharged from the tip of the rod reaching the reaching hole.