JPH0228679B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a small diameter tube propulsion device.

Conventional Technology In the past, small-diameter pipes for water, sewage, gas, and electrical lines were usually installed by digging trenches in the ground, covering them with soil, etc., and then burying them. However, depending on the construction site, it may not be possible to dig trenches in the ground for reasons such as interfering with the active environment. Additionally, if traffic obstruction is significant, construction work will be severely restricted. Furthermore, the impact on the surrounding ground and structures on the ground must be taken into account, and the conventional method of small-diameter tube propulsion has many drawbacks.

For this reason, a consolidation type small diameter hole drilling method (for example, Japanese Patent Application Laid-Open No. 50-26313) has been proposed.

Problems to be Solved by the Invention However, the compaction type small diameter hole drilling method had a large propulsion resistance because the discharged soil did not pass through the inside of the steering device. Moreover, the propulsion resistance was applied to the hydraulic cylinder. For this reason, there was a drawback that a high-output hydraulic cylinder had to be used.

OBJECT OF THE INVENTION The purpose of the present invention is to eliminate the drawbacks of the prior art, to enable small-diameter pipes to be buried accurately and efficiently even in places where excavation is not possible, and to bury a leading pipe using a hydraulic cylinder with a small output. An object of the present invention is to provide a small diameter tube propulsion device that can move the front part of a small diameter tube.

SUMMARY OF THE INVENTION In order to achieve such an object, the present invention provides a leading pipe having a cutting edge for excavation at the tip and having approximately the same outer diameter as the buried pipe, and a mutually movable front part constituting the leading pipe. and a rear part, four hydraulic cylinders pivotally supported at the front part and the rear part, respectively, for correcting the traveling direction of the leading pipe, and hydraulic pressure connected to the hydraulic cylinders for operating any hydraulic cylinder. a screw auger rotatably disposed in the leading pipe and for carrying out the excavated soil excavated by the cutting edge backward; and a screw auger having approximately the same outer diameter as the buried pipe and attached to the leading pipe. A required number of guide pipes follow, and a screw is rotatably provided in the guide pipes and is connected to the screw auger of the guide pipe and also connected to each other to convey the discharged soil backward. an auger, an excavation stand provided on a starting pile for propelling the guide pipe and the guide pipe in the direction of a predetermined planned line underground; and a laser emitting light provided on the side of the excavation stand. a light receiver that receives a laser beam emitted from the laser emitter in the direction of the planned line, and a control device that receives a signal from the light receiver and controls the hydraulic device; In order to increase the projected area in the longitudinal direction of the spherical surface where the part and the rear part join, the inner diameter of the spherical surface is formed to be approximately half the outer diameter of the spherical surface, thereby reducing the load in the longitudinal direction applied to the front part of the leading tube. The gist of the present invention is a small-diameter tube propulsion device characterized in that the entire structure is supported by the rear portion of the guide tube.

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment Referring to FIG. 1, an outline of the operating principle of the small diameter tube propulsion device according to the present invention will first be explained.

Dig a starting shaft 2 and a reaching shaft 3 in the ground 1. The small diameter pipe is buried between these two shafts 2 and 3. A digging platform 4 is provided at the bottom of the starting shaft 2. Then, after accurately determining the direction in which the excavation stage 4 excavates, excavation of the leading pipe 5 having approximately the same outer diameter as the small diameter pipe is started. Once the guide pipe 5 has been excavated to a predetermined point, guide pipes 6 are then added. The soil dug by the leading pipe 5 is removed by the leading pipe 5.
The robot enters the interior from the tip of the guide pipe 5 and guide pipe 6, is carried by a screw auger (described later), and emerges into the starting shaft 2. When the leading pipe 5 reaches the reaching shaft 3, a small diameter pipe such as a concrete pipe or a steel pipe is connected to the last guiding pipe 6, and the small diameter pipe continues to advance. At that time, the guide pipes 6 coming out one after another are collected in the reaching shaft 3. If such operations are continued, eventually the entire guide tube 6 will be replaced with a small diameter tube for burial.

A large number of small diameter pipes are buried as described above, but in this case, it is required to bury them accurately along the planned line. In order to meet this requirement, the leading pipe 5 must be excavated in line with the planned line as accurately as possible.

The small diameter tube propulsion device according to the present invention is configured to be able to control the direction of propulsion of the guide tube 5 using laser beams.

Referring to FIG. 2, the outline of the small diameter tube propulsion device according to the present invention will be explained. The leading tube 5 has a spherical surface 5c at a joint between a front portion 5a and a rear portion 5b that correspond to each other. The front portion 5a is rotatable relative to the rear portion 5b. Between the front part 5a and the rear part 5b, there is a third
As shown in the figure, four hydraulic cylinders 7
are connected to each other, and a desired hydraulic cylinder 7 is expanded or contracted by hydraulic pressure from a hydraulic device 8, thereby changing the direction of the front portion 5a of the leading pipe 5. For example, by moving either the top, bottom, left, or right of the operation button 10 of the control device 9, the hydraulic valve 11 of the hydraulic device 8 is selectively opened or closed, and the hydraulic pressure from the hydraulic pump 12 is directed to a desired hydraulic cylinder. Send to 7. Thereby, the hydraulic cylinder 7 is operated. A potentiometer 13 is provided corresponding to each hydraulic cylinder 7, and its detection signal is sent to a controlled variable display section 14 of the control device 9, where the controlled variable is displayed. The figure shows an upward control amount of 1.23mm.
is displayed as. The advance of the leading tube 5 is electrically controlled by a potentiometer 13, providing high directional accuracy while maintaining balance in the vertical and horizontal directions.

On the side of the starting shaft 2, a laser emitter 15 is provided, for example, on a part of the excavation platform 4. As this laser emitter 15, a He--Ne gas laser device or the like can be used. The course of the light beam from the laser emitter 15 is set to the planned line of the buried small diameter pipe.
Then, a light receiver 16 is provided in a part of the guide tube 5.
This light receiver 16 receives the light beam from the laser emitter 15, sends the signal to the synchro sweep converter 17 of the control device 9, and displays on the position indicator 18 the deviation between the leading pipe 5 and the planned line, for example at a point P. Display as .

The operator moves the operation button 10 while watching the position display 18 and the control amount display 14 to correct the trajectory of the propulsion path of the guide pipe 5.

In addition, without relying on such operator operations,
Of course, it is also possible to automate everything. In that case, the operation button 10, control amount display 14, position display 18, etc. may be omitted. The control device 9 referred to in this specification includes one having such a function.

An example of the digging platform 4 will be described with reference to FIG. 4. Two guide bodies 4b, 4c on both sides of the base 4a
are arranged in parallel, and a pushing plate 4d is placed along it.
is now able to move. This pushing plate 4d
A plunger (not shown) is connected to , and pushes the pushing plate 4d forward with hydraulic power. By doing so, the leading pipe 5 is advanced. The digging table 4 is also provided with a plunger motor (not shown) for rotating screw augers (described later) of the guide pipe 5 and the guide pipe 6. Furthermore, a fine adjustment device (not shown) is provided for setting the guide pipe 6 to accurately match the planned line before starting excavation. It is also possible to accommodate other hydraulic hoses, but these are omitted for the sake of simplification.

An example of the guide tube will be described in detail with reference to FIGS. 5 to 9.

Half of FIG. 4 is a cross-sectional view. As already explained, the front part 5a and the rear part 5b are spherical surfaces 5.
It is rotatably joined at c. For example, if it rotates to the chain line X, the leading pipe 5
becomes propelled upward. Front part 5a
The center of rotation of is indicated by point O. A plurality of hydraulic cylinders 7 rotate the front portion 5a in this manner. In this illustrated example, hydraulic cylinders 7 are pivotally supported at four locations on the top, bottom, left, and right sides of the front portion 5a and the rear portion 5b, and one is representatively shown in the figure.

The leading pipe 5 has almost a double structure, and has a cylindrical space 5d inside, in which a screw auger 20 is rotatably disposed. A screw 20a is fixed to a rotating shaft 20b. The rotating shaft 20b is supported by a support body 21. A cutting edge 22 for digging provided at the tip of the leading pipe 5
The excavated earth entering from the direction of arrow Y through the gap is transferred rearward by the screw auger 20.

The longitudinal projected area of the spherical surface 5c where the front part 5a and the rear part 5b are in contact is made as wide as possible, as shown in FIG. 9, so that the entire longitudinal load applied to the front part 5a is supported by the rear part 5b. . Spherical surface 5c
The inner diameter _R2 is approximately half the outer diameter _R1 . FIG. 8 is a partial sectional view showing an example of the front portion 5a, and FIG.
This figure is a front view showing the spherical surface 5c of the front part 5a shown in FIG. 8. Note that 5e is a through hole through which the rod of the hydraulic cylinder 7 passes, and 5f is a through hole that connects the rod of the hydraulic cylinder 7.

6 and 7 show the rear end of the leading tube 5. FIG. A light receiver 16 is fixed between the double structure of the leading tube 5. The laser beam is the starting shaft 2.
(Fig. 1)
(Fig.), passes through the optical path of the guide tube 6 on the way, and reaches this light receiver 16. Further, the rear end 20c of the rotating shaft 20b of the screw auger 20 is configured to communicate with the tip of the rotating shaft of the screw auger of the guide pipe 6.

Hydraulic hoses, electric cables, and the like are arranged near both sides of the path of the laser beam in both the lead pipe 5 and the guide pipe 6 in the illustrated example. In FIG. 7, this is the portions 22 and 23 on both sides of the light receiver 16.

Note that the screw auger 20 is omitted in FIG. 7.

FIG. 10 shows an example of a guide tube. The main role of the guide pipe 6 is to transmit thrust, maintain straight movement, and carry out excavated earth. Its outer diameter is the same as the outer diameter of the buried small diameter pipe. This can prevent subsidence and collapse after burial is completed. Further, the guide tube 6 has a double structure, with a passage 25 for the laser beam in the middle.
A screw auger 26 is rotatably provided in the internal space 6a. At one end of the screw auger 26, a male connecting part 26a, which is the same as that of the leading pipe 5, is formed, and at the other end, a female connecting part 26b is formed. As a result, the leading pipe 5
The thrust of the screw auger of the guide pipe 6 can be transmitted.

Since the small diameter pipe propulsion device according to the present invention is configured as described above, construction pollution (traffic disturbance, noise,
Environmental damage caused by vibrations, etc.) can be minimized, and there is no negative impact on the surrounding ground. Furthermore, even if there are structures on the ground,
Since construction can be carried out under such conditions, it is extremely effective in areas where excavation is not possible, such as in densely populated areas and narrow roads. Since the propulsion path can be corrected along the planned line, even if there are existing buried objects underground, the small-diameter pipe can be buried precisely in the predetermined location, avoiding them. Since all the load in the longitudinal direction applied to the front part 5a of the leading pipe 5 can be supported by the rear part 5b of the leading pipe 5,
The load applied to the hydraulic cylinder 7 becomes extremely small. Therefore, the front portion 5a of the leading pipe 5 can be sufficiently moved even with a low output hydraulic cylinder. In particular, in the present invention, the inner diameter of the spherical surface is formed to be approximately half the outer diameter of the spherical surface in order to widen the longitudinal projected area of the spherical surface where the front and rear parts of the leading tube join. The front and rear parts of the conduit are always in close contact with each other in an optimal state at any joint position, and can support the load in a well-balanced and stable manner. As a result, direction changes can be made accurately. in this way,
The effects of the present invention are remarkable.

[Brief explanation of drawings]

FIG. 1 is a diagram briefly showing the operating principle of the small diameter pipe propulsion device according to the present invention, FIG. 2 is an explanatory diagram showing the outline of the device of the present invention, and FIG. A cross-sectional view, Figure 4 is a schematic slope view showing the state in which the leading pipe is set on the digging platform, Figure 5 is a partial sectional view showing the tip of the leading pipe, and Figure 6 is the rear end of the leading pipe. 7 is an end view showing the rear end of the leading tube, FIG. 8 is a partial sectional view showing the front part of the leading pipe, and FIG. 9 is a partial sectional view showing the spherical surface of the front part shown in FIG. 8. The front view shown in FIG. 10 is a partial sectional view showing the guide tube. 2... Vertical shaft for starting, 3... Vertical shaft for reaching, 4
...Horisudai, 5...Leading pipe, 5a...Front part, 5b
...Rear part, 5c... Spherical surface, 6... Guide tube, 7...
Hydraulic cylinder, 8... Hydraulic device, 9... Control device, 15... Laser emitter, 16... Light receiver,
20...Screw auger, 22...Drilling cutting edge.

Claims (1)

[Claims] 1. A leading pipe having a cutting edge for excavation at its tip and having approximately the same outer diameter as the buried pipe, a mutually movable front and rear part constituting the leading pipe, and a means for correcting the traveling direction of the leading pipe. four hydraulic cylinders pivotally supported at the front and rear portions, a hydraulic device connected to the hydraulic cylinders for operating any hydraulic cylinder, and rotatably arranged in the guide pipe. a screw auger for conveying the excavated soil by the cutting edge backward; a required number of guide pipes having approximately the same outer diameter as the buried pipe and following the guide pipe; and a screw auger that rotates inside the guide pipe. A screw auger that is freely provided and is connected to the screw auger of the leading pipe and also connected to each other to convey the removed soil backward, and a screw auger that transports the leading pipe and the guiding pipe underground A digging platform provided on a starting pile to propel the vehicle in the direction of a predetermined planned line, a laser emitter provided on the side of the excavating platform, and a laser emitter that emits light in the direction of the planned line. a light receiver that receives the laser beam, and a control device that controls the hydraulic device in response to a signal from the light receiver, and a longitudinal projected area of the spherical surface where the front and rear parts of the leading pipe join. In order to increase the width, the inner diameter of the spherical surface is formed to be approximately half the outer diameter of the spherical surface, so that the longitudinal load applied to the front part of the leading tube is entirely supported by the rear part of the leading tube. Small diameter tube propulsion device.