JP4967103B2 - Underground construction method for synthetic resin pipes - Google Patents

Description

  The present invention relates to an underground laying method of a synthetic resin pipe in which a synthetic resin pipe (for example, a vinyl chloride pipe, a polyethylene pipe) is laid in the ground, and in particular, even in the ground such as gravel, cobblestone, and bedrock layer that are difficult to construct. Further, the present invention relates to an underground laying method of a synthetic resin pipe that can directly lay a synthetic resin pipe such as a vinyl chloride pipe without using a casing pipe (sheath pipe).

  In the ground, various pipes such as a sewer pipe, a water pipe, a gas pipe, and a wire pipe are provided by laying steel pipes, synthetic resin pipes, and the like. With these pipe laying construction methods, for example, as shown in FIG. 9, the sewer pipe line is laid with the main pipe 20 and the branch pipe 21 connecting the household ridge 22 and the main pipe 20 (buried). There is construction. Conventionally, the laying (buried) work during this time has been performed by the open-cut method. For example, an excavation groove is excavated along the road 23, the main pipe 20 is laid in the excavation groove, the manhole 24 is installed, and then the main pipe 20 is laid by filling the excavation groove. The branch pipe 21 connecting the home awning 22 and the main pipe 20 is excavated with a trench for laying between the main pipe 20 and the home tub 22 by an open-cut method, and the branch pipe 21 is laid in this groove. And was done by refilling the ditch.

  In the main burial work along the road by such an open-cut method, traffic regulation is required, which causes traffic congestion, and safety measures for pedestrians and traveling vehicles are also required. Excessive time and labor are required for excavation and backfilling of the open groove, and road pavement restoration is also added, which requires a lot of expenses. Further, in the burial work of the branch pipe 21, as shown in FIG. 9, when there are a fence 25, a plant 26, a waterway, other buried pipes, etc. between the main pipe 20 and the indoor fence 22, Becomes an obstacle, and the removal work and the repair work are often accompanied, making the construction difficult.

Therefore, as a solution to such a problem, a non-cutting method is provided in which various pipes are laid in the ground without excavating a cut groove. Conventionally, in this non-cutting method, a conical propulsion head is provided at the tip of the buried pipe for laying, and the buried pipe is pushed from the transmission shaft side by a propulsion device into the ground (for example, patent document) 1, 2 and 3),
An auger screw and an auger equipped with a cutter head at the tip are inserted into the buried pipe for laying, excavated with this auger, and the buried pipe is propelled into the ground while discharging the earth and sand from the buried pipe to the shaft side. (See, for example, Patent Documents 4 and 5).
JP 50-146112 A Japanese Patent Laid-Open No. 9-14480 JP 10-68290 A Japanese Patent Laid-Open No. 2-144498 Japanese Patent Laid-Open No. 9-60475

However, the laying method in which a conical propulsion head is installed at the tip of the buried pipe to be laid, and this buried pipe is pushed from the start shaft side by the propulsion unit into the ground with the propulsion head as the head, the large pushing force is applied to the buried pipe. (Thrust) is applied, and the buried pipe is a synthetic resin pipe with no strength such as a vinyl chloride pipe or a polyethylene pipe in order to propel the buried pipe while consolidating the sand and sand with the leading propulsion head. Has problems such as buckling, deformation and breakage, as well as problems that cannot be drilled and laid when there are gravel, cobblestone, bedrock layer, etc. in the ground to be buried.
In addition, an auger screw and an auger equipped with a cutter head at the tip are inserted into the buried pipe for laying and excavated with this auger, and the buried pipe is propelled into the ground while discharging excavated soil from the buried pipe to the shaft side. Although the construction method can be laid with synthetic resin pipes, there is still a problem that if there are cobblestones and bedrock layers in the ground, they cannot be drilled and laid. Cobblestones, etc., are carried into the buried pipe by the auger and may be pinched between the auger screw and the inner wall of the buried pipe, making it impossible to rotate the auger. In addition, even if the auger has a cutter head at the tip, Layers cannot be excavated, or even if drilled, drilling takes a long time and is actually unsuitable for use.

  Furthermore, in the case of a synthetic resin pipe, there is also provided a construction method in which a high-strength steel pipe or the like is disposed as a sheath pipe (casing pipe), and the synthetic resin pipe is inserted and embedded in the sheath pipe. According to this method, even if it is a synthetic resin pipe, the synthetic resin pipe is not subjected to high stress due to thrust or frictional resistance against the hole wall surface, so it can be easily laid without buckling, deformation, breakage, etc. it can. However, this construction method uses a sheath pipe in addition to the buried pipe to lay it, and it is much more costly, and it is the construction of the sheath pipe and the buried pipe, and after the buried pipe is inserted into the sheath pipe In this construction, a filler is injected between the sheath pipe and the buried pipe, and there is a problem that the construction process increases.

  The present invention has been proposed to solve such problems. The purpose of the present invention is to provide a sheath pipe (casing pipe) in the ground, especially in the ground such as gravel, cobblestone, and bedrock layer that are difficult to construct. The synthetic resin pipe can be laid directly without digging without using a).

In order to solve the above problems, the synthetic resin pipe underground laying method of the present invention is provided with a ring bit at the tip of the synthetic resin pipe to be laid, and a hollow rod is inserted into the synthetic resin pipe, A striking device is connected to the tip of this rod and is located on the tip side in the synthetic resin tube. This striking device has a drilling bit having an outer diameter slightly larger than the outer diameter of the synthetic resin tube on the tip side. Removably connected as a preceding position than the ring bit of
The rear end of the synthetic resin tube and the rod is connected to a propulsion device that applies thrust to the synthetic resin tube and the rod,
The rod is connected to a swivel provided in the propulsion unit, and the hollow portion of the rod serves as a fluid passage, and compressed fluid is supplied from the fluid pressure source to the striking device through the fluid passage of the rod through the swivel to drive the striking device. A synthetic resin pipe laying method for laying a synthetic resin pipe underground using a drilling device,
Install the excavator in the shaft, set the tip of the synthetic resin tube in the direction to be laid, drive the striking device to apply the striking force to the excavation bit, and in the direction to lay the ground While excavating, thrust the synthetic resin pipe and rod with a propulsion machine while propelling it into the ground, stop the excavation when the synthetic resin pipe reaches the predetermined reach shaft or premises, remove the drill bit from the striking device The striking device and the rod are pulled out from the synthetic resin pipe by the propulsion device, and laying is completed .
Further, the ring bit provided at the tip of the synthetic resin tube may be omitted.

As a result, the excavation bit is given a striking force by the striking device, and is thrust by the propulsion device and advances while drilling. Since this excavation bit is in a position preceding the tip of the synthetic resin pipe, the synthetic resin pipe looks like being pushed by the thrust of the propulsion machine following the excavation bit into the hole excavated by the excavation bit. At this time, since the outer diameter of the excavation bit is slightly larger than the outer diameter of the synthetic resin pipe, the hole formed by the excavation bit is slightly larger than the outer diameter of the synthetic resin pipe. Therefore, the synthetic resin pipe can be pushed in with a small thrust, and no large external force acts. Therefore, the synthetic resin pipe does not buckle, deform or break, and does not use a casing pipe (sheath pipe). Can be laid directly on.
In addition, the drilling bit is given a striking force by a striking device, so it can be easily drilled even in the ground such as gravel, cobblestone, and bedrock layer, and even a synthetic resin pipe does not use a casing pipe (sheath pipe) directly. Can be laid.
Furthermore, since it can be laid directly in the ground without using a casing tube (sheath tube), the number of construction steps is small and the construction time is short.
Further, the underground construction method of the synthetic resin pipe according to the present invention is such that the excavation bit is detachably connected to the striking device, and is removed from the striking device when it reaches the reach shaft or the house anchor, and the striking device and the rod are taken from within the synthetic resin pipe. It is characterized by pulling out.
As a result, when the excavation bit reaches the reaching shaft or the house pit, it can be removed from the striking device and the striking device and the rod can be pulled out from the synthetic resin pipe.

Further, in the underground laying method of the synthetic resin pipe according to the present invention, the propulsion unit is provided with a rotation drive mechanism, the rod is connected to the rotation drive mechanism, and the excavation bit can be rotated by the rotation drive mechanism via the rod. And
The excavation bit is provided with a striking force by a striking device, a thrust by a propulsion device, and a rotational force by a rotational drive mechanism, and digs in the ground.
As a result, in addition to the above actions and effects, the excavation bit is also excavated by applying a rotational force in addition to the striking force, so that the excavation efficiency is further improved and the construction time can be further shortened.

Further, in the underground laying method of the synthetic resin pipe according to the present invention, the propulsion unit is provided with a rotation drive mechanism, and the synthetic resin pipe is connected to the rotation drive mechanism and is rotatable.
The synthetic resin pipe is given a thrust by a propulsion device and a rotational force by a rotational drive mechanism, and propels the underground.
Thereby, in addition to the above-mentioned actions and effects, a rotational force is also applied to the synthetic resin pipe, and the synthetic resin pipe can be propelled while rotating, so that it is possible to make the pushing-in approach into the ground easier. However, since rotating the vinyl chloride pipe or the like may damage the outer peripheral surface, it can be said that it is preferable to propel it without rotating it.

Further, according to the synthetic resin pipe laying method of the present invention, the propulsion unit is provided with a rotation drive mechanism, the rod is connected to the rotation drive mechanism, and the excavation bit can be rotated by the rotation drive mechanism via the rod. And
The ring bit is rotatably provided at the tip of the synthetic resin pipe, and the rotational force of the drill bit can be transmitted from the drill bit.
As a result, in addition to the action and effect described above, the excavation bit is not only provided with striking force, rotational force and thrust, but also the ring bit is provided with rotational force, so it can be excavated while rotating the ring bit. It is even easier to push the synthetic resin tube into the ground.

Furthermore, the synthetic resin pipe underground laying method according to the present invention is such that the excavation bit is provided with a discharge hole communicating with the striking device so as to penetrate toward the front end surface and / or the side surface, and the compression that drives the striking device. The fluid is discharged from the discharge hole.
Thereby, the compressed fluid (for example, compressed air) supplied to the striking device through the fluid passage (hollow part) of the rod from the fluid pressure source (for example, the compressor) through the swivel drives the striking device and then discharges the drill bit. It is discharged from the hole.
At this time, if there is a fluid discharge passage between the synthetic resin tube and the impacting device and between the synthetic resin tube and the rod, the fluid discharged from the discharge hole of the drilling bit is discharged together with slime. It is discharged from the passage to the shaft side.
Thereby, since the earth and sand (slime) generated by excavating with the excavation bit can be excavated while being discharged to the shaft side, excavation resistance is reduced and the excavation becomes easier.

Further, in the underground laying method of the synthetic resin pipe of the present invention, the excavation bit is a bit that can be expanded / reduced, and the diameter is increased when the excavation is carried out, and the diameter is reduced when reaching a reach shaft or a house pit. or as available-out pull disconnect the synthetic resin tube with impact device and rod Te.
As a result, the excavation bit can be drilled with the diameter expanded until the synthetic resin pipe reaches the reach shaft or the inner shaft, and the diameter can be reduced when the synthetic resin pipe reaches the excavation bit and pulled out from the synthetic resin pipe together with the striking device and the rod.

According to the underground laying method of the synthetic resin pipe of the present invention, the following effects can be obtained.
(1) Even a synthetic resin pipe can be directly laid in the ground without causing buckling, deformation, breakage, etc., without using a casing pipe (sheath pipe), and without cutting.
(2) Since the striking force is applied to the excavation bit by the striking device, it can be easily excavated even in the ground where gravel, cobblestone, ground layer, etc. exist in the ground, and a synthetic resin pipe or a casing pipe (sheath pipe) ), And can be laid directly in the ground without buckling, deformation, breakage, etc. by non-open cutting.

(3) Since the synthetic resin pipe can be laid directly in the ground without using a casing pipe (sheath pipe), the construction process is few and the construction time is short. Therefore, the construction cost is also low.
(4) Since it is a non-open cutting method, it will not be an obstacle to pedestrians and traveling vehicles, no measures will be taken against pedestrians and traveling vehicles, and there are obstacles such as buildings, fences and planted trees on the ground. However, the obstacles can be installed as they are.

(5) When the excavation bit is excavated by applying a rotational force in addition to the striking force, the excavation efficiency is improved and the construction time can be further shortened.
(6) When a rotational force is also applied to the synthetic resin pipe, the synthetic resin pipe can be dug while rotating, so that it can be more easily pushed into the ground and entered, and the construction time can be shortened.
(7) If the ring bit can rotate and the ring bit is also given a rotational force, the synthetic resin tube will not rotate and only thrust will be applied, and the ring bit can be rotated while digging, so the synthetic resin tube will be pushed into the ground. The entry is further facilitated, and since only the thrust is applied to the synthetic resin pipe, there is no possibility of causing buckling, deformation, breakage, etc. in the synthetic resin pipe.

(8) When the excavation bit is provided with a discharge hole communicating with the striking device, the compressed fluid supplied to the striking device through the fluid passage (hollow part) of the rod from the fluid pressure source (for example, the compressor) via the swivel For example, the compressed air can be discharged from the discharge hole of the excavation bit after driving the striking device.
(9) Further, if the fluid discharge passage is between the synthetic resin tube and the impacting device and between the synthetic resin tube and the rod, the fluid discharged from the discharge hole of the excavation bit is accompanied by slime. Therefore, the slime generated by excavating with the excavation bit can be excavated while being discharged to the vertical shaft side, thereby reducing excavation resistance and facilitating excavation.

Hereinafter, as an underground laying method for a synthetic resin pipe, an embodiment in which a sewer pipe is laid underground will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view in which a main pipe of a sewer pipe is laid underground, and FIG. 2 is a schematic cross-sectional view in which a branch pipe of a sewer pipe is laid underground.

  In FIG. 1, for example, the main pipe 20 of the sewer pipe shown in FIG. 9 is laid underground, and the main pipe 20 is directed toward the reaching vertical shaft 28 by the propulsion device 2 as the excavating device 1 installed in the start shaft 27. Excavation and underground laying are schematically shown, and in FIG. 2, for example, the branch pipe 21 of the sewer pipe shown in FIG. 9 is laid underground, and the excavator 1 installed in the vertical shaft 27. A state in which the branch pipe 21 is dug toward the indoor cage 22 by the propulsion unit 2 and is laid underground is schematically shown. In this case, it is needless to say that the main pipe 20 and the branch pipe 21 of the sewer pipe are synthetic resin pipes. In FIG. 1 to FIG.

  FIG. 3 is a partial cross-sectional explanatory view showing the main part of the embodiment of the present invention. A ring bit 8 is connected to the tip of the synthetic resin tube 7 to be laid, and a hollow rod 9 is inserted into the synthetic resin tube 7, and a striking device 10 is connected to the tip of the rod 9 to synthesize the synthetic resin. The drilling bit 11 having an outer diameter slightly larger than the outer diameter of the synthetic resin pipe 7 is preceded by a ring bit 8 at the distal end of the synthetic resin pipe 7. The rear ends of the synthetic resin tube 7 and the rod 9 are connected to a propulsion unit 2 that applies thrust to the synthetic resin tube 7 and the rod 9.

  The propulsion unit 2 is attached so as to freely advance and retract along a guide rail 6 provided on the machine base 5, is connected to a piston rod of a cylinder (not shown), and is advanced and retracted along the guide rail 6. Therefore, thrust can be applied to the synthetic resin tube 7 and the rod 9 connected to the propulsion unit 2 by the propulsion unit 2.

A swivel 3 is connected to the propulsion unit 2, and the swivel 3 is connected to a fluid pressure source (not shown) such as a compressor via a hose 4.
The hollow rod 9 connected to the propulsion device 2 has a hollow portion serving as a fluid passage, and communicates with the swivel 3. The striking device 10 is connected to a fluid pressure source, for example, a rod from a compressor via the propulsion device 2. Compressed fluid, for example, air pressure, is supplied through the nine fluid passages to drive the striking device 10. The striking device 10 can be a device that has a built-in hammer and operates with the supplied compressed fluid.
The compressed fluid, for example, compressed air, that has driven the striking device 10 discharges fluid between the synthetic resin tube 7 and the striking device 10 16 and between the synthetic resin tube 7 and the rod 9 as shown in FIG. A discharge hole (not shown) that is discharged as a passage to the vertical shaft 27 side or communicated with the hitting device 10 in the excavation bit 11 is provided penetrating toward the front end surface and / or the side surface, and the hitting device 10 is driven. Compressed fluid, for example, compressed air, is discharged from the discharge hole, and the vertical shaft 27 with slime from the discharge passage 16 between the synthetic resin pipe 7 and the impacting device 10 and 17 between the synthetic resin pipe 7 and the rod 9. To discharge to the side.

  Thus, when the propulsion device 2 is installed in the shaft 27 as the excavating device 1 and the tip of the synthetic resin pipe 7 is set in the direction to be laid, and the impacting device 10 is driven, the impact force is applied to the excavating bit 11. Therefore, the excavation bit 11 excavates the ground in the direction to be laid. Therefore, when thrust is applied to the synthetic resin tube 7 and the rod 9 by the propulsion unit 2, the synthetic resin tube 7 is sequentially pushed in by the propulsion unit 2 along the drilling hole excavated by the excavating bit 11, and finally reaches the reaching shaft. 28 or the home basket 22 is reached. When the synthetic resin pipe 7 reaches the predetermined reach shaft 28 or the indoor pit 22, the propulsion by the propulsion unit 2 and the driving of the impacting device 10 are stopped, and the excavation bit 11 is removed or the diameter is reduced to hit the impacting device 10 and the rod. 9 is pulled out from the synthetic resin pipe 7, and the underground laying of the synthetic resin pipe 7 is completed. Of course, the ring bit 8 provided at the tip of the synthetic resin tube 7 is also removed. The ring bit 8 is not always necessary, but if it is provided, it is easy to enter the ground along the drilling hole, and unnecessary external force is not applied to the synthetic resin tube 7, and buckling, deformation, breakage, etc. Since it can prevent, it is preferable.

  According to such an underground laying method of the synthetic resin pipe 7, the excavation bit 11 is given a striking force by the striking device 10, and a thrust is given by the propulsion device 2 to dig while drilling. Since the excavation bit 11 is in a position preceding the tip of the synthetic resin pipe 7, the synthetic resin pipe 7 follows the excavation bit 11 and is pushed by the thrust of the propulsion device 2. At this time, since the outer diameter of the excavation bit 11 is slightly larger than the outer diameter of the synthetic resin pipe 7, the hole formed by the excavation bit 11 is slightly larger than the outer diameter of the synthetic resin pipe 7. Therefore, since the resistance added to the synthetic resin pipe 7 is small, it can be pushed in with a small thrust, so that a large external force (friction resistance, etc.) does not act, and the synthetic resin pipe does not buckle, deform or break. It does not occur and can be laid directly in the ground without using a casing tube (sheath tube).

The excavation bit 11 is given a striking force by the striking device 10, so that it can be easily drilled even in the ground such as gravel, cobblestone and rock layer, and a synthetic resin pipe or casing pipe (sheath pipe) should be used. Can be installed directly.
Moreover, since it can be laid directly in the ground without using a casing tube (sheath tube), the number of construction steps is reduced, and the construction time is shortened.
Furthermore, because it is a non-open-cut method, it will not cause any obstacles to pedestrians and traveling vehicles, and it will work without any obstacles even if there are obstacles such as buildings, fences and planted trees on the ground where the synthetic resin pipe 7 is laid. it can.

In this method of laying the synthetic resin pipe 7, the synthetic resin pipe 7 and the rod 9 are not made of a single long synthetic resin pipe and rod, but instead of a predetermined length of the synthetic resin pipe and rod. In use, when a predetermined length enters the ground, the synthetic resin tube 7 and the rod 9 are sequentially and repeatedly added to the rear ends of the synthetic resin tube 7 and the rod 9.
Moreover, in the underground laying method of the synthetic resin pipe of this invention, it is necessary to always maintain the concentric state between the synthetic resin pipe 7 and the rod 9 inserted into the synthetic resin pipe 7. Therefore, it is preferable to provide the rod 9 with the stabilizer 12 as shown in FIG. 3 because the rod 9 is always held concentrically with the synthetic resin tube 7.

FIG. 4 is an explanatory diagram showing a construction example of the synthetic resin pipe underground laying method shown in the embodiment in order of steps (a), (b), (c), (d), and (e). This construction example is an example in the case where the excavation bit is a detachable bit.
First, a striking device 10 is connected to the tip of the rod 9 and inserted into a synthetic resin tube 7 having a ring bit 8 at the tip. An excavation bit 11 having an outer diameter slightly larger than the outer diameter of the synthetic resin pipe 7 is connected to the striking device 10 from the distal end side of the synthetic resin pipe 7. The excavation bit 11 of this example is a bit that can be attached to and detached from the striking device 10. The rear ends of the synthetic resin pipe 7 and the rod 9 are attached to the propulsion device 2 (see FIGS. 1 to 3) installed in the shaft 27.
Next, the synthetic resin pipe 7 attached to the propulsion unit 2 is set so that the tip thereof is directed in the direction to be laid, and a striking force is imparted to the excavation bit 11 by the striking device 10 and thrust is imparted by the propulsion unit 2. Then, digging while drilling. Then, the synthetic resin pipe 7 follows the excavation bit 11 and is pushed by the thrust of the propulsion device 2 into the hole excavated by the excavation bit 11 and enters in the direction to be laid (FIG. 4A).

Then, finally, as shown in FIG. 4B, the synthetic resin pipe 7 reaches a predetermined reaching shaft 28 or the indoor cage 22. Therefore, the driving of the striking device 10 and the propulsion device 2 is stopped, and the excavation bit 11 is removed from the striking device 10 as shown in FIG.
Next, as shown in FIG. 4 (d), the striking device 10 and the rod 9 are pulled out of the synthetic resin tube 7 by the propulsion device 2. The pulling device 10 can be pulled out by pulling out the rod 9 with the propulsion device 2. In this case, the rod 9 is pulled out by repeating removal of the rod of a predetermined length after pulling out the predetermined length, contrary to the underground approach construction. Although the excavation bit 11 is slightly larger than the outer diameter of the synthetic resin pipe 7, it is removed, so that the striking device 10 and the rod 9 can be inserted through the synthetic resin pipe 7 and pulled out. Thereby, as shown in FIG.4 (e), the underground installation of the synthetic resin pipe | tube 7 is completed. After the underground laying is completed, the ring bit 8 attached to the tip of the synthetic resin pipe 7 is removed.

  A conventionally well-known structure can be adopted as the structure that allows the excavation bit 11 to be attached to and detached from the striking device 10. For example, a configuration in which the excavation bit 11 and the impacting device 10 are screw-coupled, a configuration in which a convex portion is provided on one side, and a concave groove in which the convex portion is fitted on the other are provided, and the coupling is performed by fitting each other. Can do.

FIG. 5 is an explanatory view showing another construction example of the synthetic resin pipe underground laying method shown in the embodiment in order of steps (a), (b), (c), (d), and (e). This construction example is a case where the excavation bit is a bit that can be expanded and contracted.
First, a striking device 10 is connected to the tip of the rod 9 and inserted into a synthetic resin tube 7 having a ring bit 8 at the tip. A drilling bit (expansion / contraction bit) 11 having an outer diameter slightly larger than the outer diameter of the synthetic resin pipe 7 is connected to the impacting device 10 inserted into the synthetic resin pipe 7 from the distal end side of the synthetic resin pipe 7. The excavation bit 11 of this example is a bit that can be expanded and contracted. When the diameter is increased, the outer diameter is slightly larger than the outer diameter of the synthetic resin pipe 7, and when the diameter is reduced, the outer diameter is smaller than the inner diameter of the synthetic resin pipe 7. It is. Therefore, in the case of this expansion / contraction bit, it may be attached to the distal end side of the impacting device 10 first and inserted into the synthetic resin tube 7 in a reduced diameter state. . The rear ends of the synthetic resin pipe 7 and the rod 9 are attached to the propulsion device 2 installed in the shaft 27.
Next, the synthetic resin pipe 7 attached to the propulsion device 2 is set with its tip directed in the direction to be laid, and a striking force is applied by the striking device 10 to the expanded excavation bit 11. Drilling while drilling with thrust. Then, the synthetic resin pipe 7 follows the excavation bit 11 and is pushed by the thrust of the propulsion unit 2 into the hole excavated by the excavation bit 11 and enters in the direction to be laid (FIG. 5A).
Then, finally, as shown in FIG. 5B, the synthetic resin pipe 7 reaches the predetermined reaching shaft 28 or the indoor cage 22. Therefore, the driving of the striking device 10 and the propulsion device 2 is stopped, and the diameter of the excavation bit 11 is reduced as shown in FIG.
Next, as shown in FIG. 5D, the excavation bit 11, the striking device 10, and the rod 9 that have been reduced in diameter by the propulsion device 2 are pulled out from the synthetic resin pipe 7. At this time, the excavation bit 11 is reduced in diameter to be smaller than the inner diameter of the synthetic resin tube 7, so that the inside of the synthetic resin tube 7 can be inserted. Thereby, the underground laying of the synthetic resin pipe 7 is completed as shown in FIG. After completion of the underground laying, the ring bit 8 attached to the tip of the synthetic resin pipe 7 is removed.

  As the excavating bit 11 that can be expanded and contracted, a conventionally known one such as a retract bit can be adopted. For example, what is shown to patent 2574705 can be illustrated. For example, as shown in FIGS. 6A and 6B, the retract bit (excavation bit 11) expands in diameter by rotating in one direction (FIG. 6A) and decreases in diameter by rotating in multiple directions (FIG. 6). (B)) bits to be used. In the case of this expandable / reducible bit (also referred to as an expanded bit), since the bit is composed of a plurality of divided bodies, if the outer diameter of only one of them is oversized (slightly larger diameter) It is possible to correct some direction during excavation and propulsion. According to experiments, this diameter expansion bit was able to be corrected somewhat by repeating normal rotation and inversion. This experiment was confirmed by inserting the target into a hollow rod and visually observing it.

In addition, although the said embodiment demonstrated the excavation bit 11, the synthetic resin pipe | tube 7, and the ring bit 8 not rotating, these may be made to rotate.
That is, the propulsion unit 2 is provided with a rotation drive mechanism (not shown, the same applies hereinafter), the rod 9 is connected to the rotation drive mechanism, and the excavation bit 11 can be rotated by the rotation drive mechanism via the rod 9. And
The excavation bit 11 may be given a striking force by the striking device 10, a thrust by the propulsion device 2, and a rotational force by the rotational drive mechanism, and may dig in the ground. As a rotation drive mechanism, the structure rotated through a conduction mechanism with a motor can be illustrated.
According to this embodiment, the excavation bit 11 can be excavated by applying a rotational force in addition to the striking force, so that the excavation efficiency is further improved and the construction time is further shortened.

The propulsion unit 2 is provided with a rotation drive mechanism, and the synthetic resin pipe 7 is connected to the rotation drive mechanism and is rotatable.
The synthetic resin pipe 7 may be provided with a thrust by the propulsion unit 2 and a rotational force by the rotation drive mechanism to dig in the ground.
According to this embodiment, since a rotational force is also applied to the synthetic resin pipe 7 and the synthetic resin pipe 7 can be propelled while rotating, it is possible to further facilitate pushing-in into the ground.

The propulsion device is provided with a rotation drive mechanism, the rod is connected to the rotation drive mechanism, and the excavation bit is rotatable by the rotation drive mechanism via the rod,
The ring bit may be rotatably provided at the tip of the synthetic resin pipe, and the rotational force of the excavation bit may be transmitted from the excavation bit.
According to this embodiment, not only the striking force, the rotational force, and the thrust are applied to the excavation bit 11, but also the rotational force is applied to the ring bit 8, so that the excavation can be made while rotating the ring bit 8. Therefore, it becomes much easier to push the synthetic resin tube 7 into the ground.

An example of a configuration for transmitting the rotational force of the excavation bit 11 to the ring bit 8 will be described with reference to FIGS. FIG. 7 is a perspective view showing this embodiment, and FIG. 8 is an exploded perspective view showing this embodiment.
A ring bit 8 is rotatably provided at the tip of the synthetic resin tube 7. Inside the ring bit 8, the excavation bit 11 is positioned coaxially with the ring bit 8. As shown in FIG. 8, projecting pieces 14, 14 are provided at predetermined intervals on the inner peripheral wall surface of the ring bit 8, and an axial groove 15 is formed between the projecting pieces 14, 14. On the other hand, on the outer peripheral wall surface of the drill bit 11, as shown in FIG. 8, a protrusion 13 that fits into the groove 15 of the ring bit 8 is provided at a position corresponding to the groove 15 of the ring bit 8. As shown in FIG. 7, the ring bit 8 is inserted with a protrusion 13 inserted into the groove 15. Thereby, the rotation of the excavation bit 11 is transmitted to the ring bit 8. This embodiment is for showing an example of a configuration for transmitting the rotational force of the excavation bit 11 to the ring bit 8, and therefore the outer diameter of the excavation bit 11 is slightly smaller than the outer diameter of the ring bit 8 in FIGS. 7 and 8. Although the outer diameter of the excavation bit 11 is actually slightly larger than the outer diameter of the ring bit 8.
In addition, the structure which transmits the rotational force of this excavation bit 11 to the ring bit 8 is not limited to the said embodiment, A conventionally well-known means can be employ | adopted.

Also, in the present invention, the excavation bit 11 is provided with a discharge hole (not shown, the same applies hereinafter) that communicates with the striking device 10 so as to penetrate toward the front end surface and / or the side surface, and the compression that drives the striking device 10. The fluid may be discharged from the discharge hole.
According to this embodiment, the compressed fluid (for example, compressed air) supplied to the striking device 10 through the fluid passage (hollow part) of the rod 9 from the fluid pressure source (for example, the compressor) via the swivel 3 is the striking device 10. After being driven, it can be discharged from the discharge hole of the excavation bit 11.

At this time, as shown in FIG. 3, if the gap 16 between the synthetic resin pipe 7 and the impacting device 10 and the gap 17 between the synthetic resin pipe 7 and the rod 9 become fluid discharge passages 16, 17, The fluid discharged from the 11 discharge holes can be discharged to the shaft side from the discharge passages 16 and 17 along with the slime.
According to this embodiment, since the earth and sand (slime) generated by excavating with the excavation bit 11 can be excavated while being discharged to the shaft side, excavation resistance is reduced and excavation becomes easier.

  The above embodiment is not intended to limit the present invention, and various modifications of the present invention are allowed without departing from the spirit of the present invention.

  The present invention can be effectively used not only for sewerage pipes but also for underground laying of synthetic resin pipes in waterworks pipes, gas pipes, electric lines, and the like.

It is a cross-sectional schematic diagram which shows a mode that the main pipe of a sewer pipe is laid underground as a synthetic resin pipe. It is a cross-sectional schematic diagram which shows a mode that the branch pipe of a sewer pipe is laid underground as a synthetic resin pipe. It is a partial cross-section explanatory drawing which shows the principal part of embodiment of this invention. It is explanatory drawing which shows the construction example of this invention to process order (a) (b) (c) (d) (e). It is explanatory drawing which shows the other construction example of this invention in process order (a) (b) (c) (d) (e). It is a perspective view (a) (b) which shows an example of the bit (retractable bit) which can be expanded and contracted. It is a perspective view which shows an example of the structure which transmits the rotational force of a drill bit to a ring bit. It is a disassembled perspective view which shows an example of the structure which transmits the rotational force of a drill bit to a ring bit. It is plane explanatory drawing which shows the piping example of a sewer pipe.

DESCRIPTION OF SYMBOLS 1 Drilling device 2 Propulsion machine 3 Swivel 5 Machine base 6 Guide rail 7 Synthetic resin pipe 8 Ring bit 9 Rod 10 Blowing device 11 Drilling bit 16, 17 Fluid passage 22 House rod 27, 28

Claims (7)

The synthetic resin pipe is provided with a ring bit at the tip, and a hollow rod is inserted into the synthetic resin pipe, and a striking device is connected to the tip of the rod so as to be positioned on the tip side in the synthetic resin pipe. The drilling bit having an outer diameter slightly larger than the outer diameter of the synthetic resin tube is detachably connected to the tip side as a preceding position from the ring bit at the distal end of the synthetic resin tube,
The rear end of the synthetic resin tube and the rod is connected to a propulsion device that applies thrust to the synthetic resin tube and the rod,
The rod is connected to a swivel provided in the propulsion unit, and the hollow portion of the rod serves as a fluid passage, and compressed fluid is supplied from the fluid pressure source to the striking device through the fluid passage of the rod through the swivel to drive the striking device. A synthetic resin pipe laying method for laying a synthetic resin pipe underground using a drilling device,
Install the excavator in the shaft, set the tip of the synthetic resin tube in the direction to be laid, drive the striking device to apply the striking force to the excavation bit, and in the direction to lay the ground While excavating, thrust the synthetic resin pipe and rod with a propulsion machine while propelling it into the ground, stop the excavation when the synthetic resin pipe reaches the predetermined reach shaft or premises, remove the drill bit from the striking device A synthetic resin pipe underground laying method, wherein the striking device and the rod are pulled out of the synthetic resin pipe by the propulsion device, and the laying is completed . A hollow rod is inserted into the synthetic resin tube to be laid, and a striking device is connected to the tip of this rod and is located on the leading end side of the synthetic resin tube. A drill bit with an outer diameter slightly larger than the diameter is connected to the synthetic resin pipe so that it can be detached from the tip.
The rear end of the synthetic resin tube and the rod is connected to a propulsion device that applies thrust to the synthetic resin tube and the rod,
The rod is connected to a swivel provided in the propulsion unit, and the hollow portion of the rod serves as a fluid passage, and compressed fluid is supplied from the fluid pressure source to the striking device through the fluid passage of the rod through the swivel to drive the striking device. A synthetic resin pipe laying method for laying a synthetic resin pipe underground using a drilling device,
Install the excavator in the shaft, set the tip of the synthetic resin tube in the direction to be laid, drive the striking device to apply the striking force to the excavation bit, and in the direction to lay the ground While excavating, thrust the synthetic resin pipe and rod with a propulsion machine while propelling it into the ground, stop the excavation when the synthetic resin pipe reaches the predetermined reach shaft or premises, remove the drill bit from the striking device A synthetic resin pipe underground laying method, wherein the striking device and the rod are pulled out of the synthetic resin pipe by the propulsion device, and the laying is completed . The propulsion device is provided with a rotation drive mechanism, the rod is connected to the rotation drive mechanism, and the excavation bit is rotatable by the rotation drive mechanism through the rod,
3. The synthetic resin pipe underground laying according to claim 1, wherein the excavating bit is given a striking force by a striking device, a thrust by a propulsion device, and a rotational force by a rotational drive mechanism, and digs in the ground. Construction method. The propulsion unit is provided with a rotation drive mechanism, and the synthetic resin tube is connected to the rotation drive mechanism and is rotatable.
3. The synthetic resin pipe underground laying method according to claim 1, wherein the synthetic resin pipe is provided with thrust by a propulsion unit and rotational force by a rotary drive mechanism to propel the underground. The propulsion device is provided with a rotation drive mechanism, the rod is connected to the rotation drive mechanism, and the excavation bit is rotatable by the rotation drive mechanism through the rod,
The synthetic resin pipe underground according to claim 1, wherein the ring bit is rotatably provided at a distal end of the synthetic resin pipe, and a rotational force of the drill bit can be transmitted from the excavation bit. Laying method.   The excavation bit is provided with a discharge hole communicating with a striking device so as to penetrate toward a tip surface and / or a side surface, and a fluid that drives the striking device is discharged from the discharge hole. Item 6. An underground laying method for a synthetic resin pipe according to any one of Items 1 to 5.   Between the synthetic resin pipe and the impacting device and between the synthetic resin pipe and the rod is a fluid discharge passage, and the fluid discharged from the discharge hole of the excavation bit is discharged from the discharge passage together with slime. The underground laying method for synthetic resin pipes according to claim 6.

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