JPH0468564B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a buried pipe 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 a trench in the ground for reasons such as disturbing the living 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 considered, and the conventional method of propulsion through buried pipes has many drawbacks.

For this reason, a small-hole underground pipe propulsion method (for example, JP-A-49-27018) and a consolidation type small-diameter hole drilling method (for example, JP-A-50-26313) have been proposed. Conventional equipment used in these methods is equipped with a deviation measuring device that measures how far the buried pipe deviates from the planned line. Misalignment of buried pipes must be measured accurately, so they are measured electrically using laser beams.

Problems to be Solved by the Invention However, since conventional electrical deviation measuring devices were placed in contact with moisture or groundwater, moisture entered the deviation measuring device and caused insulation failure, resulting in electrical problems. It had the disadvantage that it became unstable and did not function as a deviation measuring device.

OBJECT OF THE INVENTION The purpose of the present invention is to eliminate the drawbacks of the prior art, and to make it possible to always accurately measure the displacement of buried pipes without the displacement measurement part being affected by moisture or groundwater. To provide a buried pipe propulsion device capable of efficiently burying a buried pipe even in a hot place.

Summary of the Invention The gist of the present invention is a buried pipe propulsion device as set forth in the claims.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, first, an outline of the operating principle of the buried pipe propulsion device according to the present invention will be explained. Dig a starting shaft 2 and a reaching shaft 3 in the ground 1. The buried pipe is buried between these two shafts 2 and 3. An excavation platform 4 is buried at the bottom of the starting shaft 2. After accurately determining the direction of excavation of the excavation table 4, excavation of the guide pipe 5 having approximately the same outer diameter as the buried pipe is started. Once the guide pipe 5 has been excavated to a predetermined point, guide pipes 6 are then added. The soil excavated by the leading pipe 5 enters the inside from the tip of the leading pipe 5, is carried through the leading pipe 5 and the guiding pipe 6 by a screw auger (described later), and exits into the starting shaft 2. come. When the leading pipe 5 reaches the reaching shaft 3, a buried pipe such as a concrete pipe or a steel pipe is connected to the last guiding pipe 6, and excavation continues. 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 pipe 6 will be replaced with a buried pipe.

A large number of buried pipes are buried as described above, but in that case, it is generally required that they be buried 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 buried pipe propulsion device according to the present invention is configured to be able to control the direction of movement of the leading pipe 5 using a laser beam.

Referring to FIG. 2, the outline of the buried pipe propulsion device according to the present invention will be explained. In the leading tube 5, a joint portion between a front portion 5a and a rear portion 5b is formed into a corresponding spherical surface 5c, and the front portion 5a is rotatable with respect to the rear portion 5b. In the illustrated example, the front part 5a and the rear part 5
Four hydraulic cylinders 7 are connected between the pipe and the pipe b, 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. It's summery. For example, the upper, lower, left, and
By moving either one on the right, the hydraulic valve 11 of the hydraulic device 8 is selectively opened and closed, and the hydraulic pressure from the hydraulic pump 12 is sent to the desired hydraulic cylinder 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 14 of the control device 9, where the controlled variable is displayed. In the figure, the upward control amount is shown as 1.23 mm. 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 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 and sends the signal to the synchro sweep converter 17 of the control device 9, and the position indicator 18
, the deviation between the leading pipe 5 and the planned line is displayed as a point P, for example.

Hereinafter, an example of the light receiver will be described in detail with reference to FIGS. 8, 9, and 10.

The laser beam from the laser emitter 15 impinges on the laser beam receiving plate 34 of the receiver. As shown in FIG. 9, phototransistors 40 are incorporated in the laser beam receiving plate 34 at regular intervals. Figure 9 shows the A- of the receiver shown in Figure 8.
It is an A sectional view. Depending on which phototransistor 40 is hit by the laser beam, the direction and magnitude of the shift can be determined.

Phototransistor 40 converts the laser beam into an electrical signal. Electrical signal is amplified and relay box 33
is sent to and amplified. The amplified electrical signal is sent to the control device 9 via the cable 32.

Laser beam receiving plate 34 and amplification relay box 3
3 is fixed within the laser receiver outer tube 36. Oil 37 is injected into the laser receiver outer tube 36, and the laser beam receiving plate 34 and the amplification relay box 33 are immersed in the oil 37.
The oil 37 protects the laser beam receiving plate 34 and the amplification relay box 33 from moisture and groundwater.
The oil 37 is preferably mineral oil. Oil 37 is injected from the oil inlet 31.

The oil 37 inside the laser receiver outer tube 36 is completely sealed by the transparent plate 35. As the transparent plate 35, an acrylic plate or the like is used. A seal ring 38 is provided around the outer periphery of the transparent plate 35. The seal ring 38 is crushed by the transparent plate 35 and the laser beam receiving plate 34, and completely seals the outer periphery of the transparent plate 35. The transparent plate 35 is the front outer tube 36b
is pressed by. In the embodiment shown in FIG. 8, the front outer cylinder tube 36b is connected to the outer cylinder main body 36a by a male screw 36c formed at the outer peripheral end.

The seal around the outer periphery of the transparent plate 35 is not limited to the example shown in FIG. 8, and various other seals may be used.
For example, as shown in FIG. 10, the laser beam receiving plate 34 and the transparent plate 35 may be tightly stacked and a seal ring 38 may be provided on the front outer tube 36b side of the transparent plate 35.

The outlet 39 of the cable 32 is also sealed with silicone rubber 30, for example.

Now, 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 tube 5 (see FIG. 2).

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 explained with reference to FIG. 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 dug. The excavation table 4 is also provided with a plunger motor (not shown) for rotating the guide pipe 5, guide pipe 6, and screw auger (described later). In addition, the guide tube 6
It is also equipped with a fine adjustment device (not shown) for setting the excavation line accurately to the planned line before excavation begins.
It is also possible to accommodate other hydraulic hoses, but these are omitted for the sake of simplification.

An example of the leading pipe will be described in detail with reference to FIGS. 4, 5, and 6.

Half of FIG. 4 is a cross-sectional view.

As already explained, the front part 5a and the rear part 5b are rotatably joined by the spherical surface 5c. For example, if the guide tube 5 is rotated as far as the chain line X, the guide tube 5 will be propelled upward by that amount.
The center of rotation of the front portion 5a is indicated by a 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 upper, lower, left, and right sides of the front portion 5a and the rear portion 5, 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.

5 and 6 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. 6, 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. 6.

FIG. 7 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 outside diameter is the same as the outside diameter of the buried 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 provided in the middle, and a screw auger 2 in the internal space 6a.
6 is rotatably provided. At one end of the screw auger 26, there is a male connecting portion 2 that is the same as the leading pipe 5.
6a is formed, and a female connecting portion 26 is formed at the other end.
b is formed. Thereby, the thrust of the screw auger of the leading pipe 5 and the guiding pipe 6 can be transmitted.

Effects of the Invention Since the buried pipe propulsion device according to the present invention is configured as described above, it has the following effects.

Detection signals indicating the direction and magnitude of the deviation from the planned line of the guide tube emitted from the plurality of phototransistors of the laser beam receiving plate are amplified by an amplification relay box and sent to the control device, which converts these amplified detection signals into Based on this, the control device can precisely control a plurality of hydraulic cylinders.

A laser beam receiving plate incorporating a plurality of phototransistors and an amplification relay box are housed in a laser receiver outer tube, and are covered with oil injected into the outer tube. As a result, this light receiving plate and amplifier relay box are always covered with oil, so moisture and groundwater are completely blocked by the oil and do not reach the light receiving plate or amplifier relay box. Therefore, both the laser beam receiving plate and the amplification relay box can maintain their performance satisfactorily for a long period of time without being corroded by moisture or ground water.

Therefore, even if the conditions at the construction site are bad and there is a lot of humidity or underground water, the direction and magnitude of deviation from the planned line can be detected by the many phototransistors on the laser beam receiving plate that is covered and protected with oil. This ensures that the electrical signal indicating the signal can be accurately amplified in an oil-covered and protected amplification relay box without being affected by moisture or groundwater. This amplified electric signal is sent to the control device, and the control device can accurately control each hydraulic cylinder based on the amplified electric signal, so that the course of the leading pipe can be correctly corrected along the planned line over a long period of time. In this respect, maintenance is easy.

Therefore, even at a construction site under adverse conditions, the underground pipe advancement work can be carried out accurately and efficiently along the planned line.

Of course, the buried pipe propulsion device according to the present invention can minimize environmental damage caused by construction pollution (traffic disturbance, noise, vibration, etc.).

The buried pipe propulsion device according to the present invention allows construction to be carried out accurately and efficiently even under adverse conditions, prevents construction from deviating from the planned line, and has no adverse effects on the surrounding ground. Furthermore, even if there are structures on the ground, construction can be carried out accurately and efficiently without being affected by moisture or groundwater, making it possible to carry out construction work in densely populated areas.
It can demonstrate outstanding power in areas where excavation is impossible, such as narrow roads.

In addition, the propulsion path can always be accurately corrected along the planned line based on the correct amplified electrical signal that indicates the direction and size of the deviation, so even if there are existing buried objects underground, the trajectory can be corrected reliably. This allows the underground pipe to be buried correctly in the designated location while avoiding In other words, troubles during propulsion work and damage to both the buried object and the buried pipe propulsion device can be prevented. Thus, the effects of the present invention are significant.

[Brief explanation of the drawing]

Fig. 1 is a diagram that simply shows the operating principle of the buried 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. 3 is a state in which the leading pipe is set on the excavation platform. 4 is a partial sectional view showing the tip of the leading tube, FIG. 5 is a partial sectional view showing the rear end of the leading tube, and FIG. 6 is a partial sectional view showing the rear end of the leading tube. 7 is a partial cross-sectional view showing the guide tube, FIG. 8 is a cross-sectional view showing an example of the light receiver used in the present invention, and FIG. 9 is a cross-sectional view of the light receiver shown in FIG.
A sectional view and FIG. 10 are partial sectional views showing other examples of the light receiver used in the present invention. 2... Vertical shaft for starting, 3... Vertical shaft for reaching, 4
...Drilling platform, 5... Leading pipe, 5a... Front part, 5
b...rear part, 5c...spherical surface, 6...guiding tube, 7...
... Hydraulic cylinder, 8 ... Hydraulic device, 9 ... Control device, 15 ... Laser emitter, 16 ... Light receiver,
20...Screw auger, 22...Drilling cutting edge, 30...Shincon rubber, 31...Hydraulic inlet,
32...Cable, 33...Amplification relay box,
34... Laser beam receiving plate, 35... Transparent plate,
36... Laser receiver outer tube, 37... Oil, 3
8...Seal ring, 40...Phototransistor.

Claims (1)

[Claims] 1. Propel a lead pipe with the same diameter as the buried pipe and a guide pipe following it in the direction of a predetermined planned line underground using an excavation platform, and place the excavated earth at the tip of the lead pipe into the lead pipe. A screw auger and a screw auger installed in the guide pipe are used to transport the pipe rearwardly, and the front and rear parts of the guide pipe are movably connected to each other and are pivoted to the front and rear parts respectively. By operating the hydraulic cylinder, the direction of movement of the leading pipe can be corrected, and furthermore,
A laser beam emitted from a laser emitter installed on the side of the excavation platform is received by a receiver installed on the leading pipe, detecting any deviation from the preset planned line, and sending the detection signal to the control device. In the buried pipe propulsion device configured to correct the course of the leading pipe by controlling the plurality of hydraulic cylinders, the light receiver may include a laser beam receiving plate for converting the laser beam into an electric signal. , an amplification relay box for amplifying the electric signal from the laser beam receiving plate and sending it to a control device, a laser receiver outer tube for housing the laser beam receiving plate and the amplifying relay box, and the laser receiver. An oil injected into the outer tube and covering the laser beam receiving plate and the amplification relay box, a transparent plate for sealing the oil in the laser receiver outer tube, and a portion of the laser beam receiving plate. a plurality of phototransistors incorporated in the laser beam receiving plate at predetermined pitches in order to detect whether the laser beam has hit a position and to detect deviation of the leading pipe from the planned line; A structure that prevents the amplification relay box from being corroded by moisture or underground water, and a structure that allows detection of the direction and size of deviation based on which phototransistor among the large number of phototransistors is hit by a laser beam. A buried pipe propulsion device characterized by: