JPS6129836Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention enables easy installation of small-diameter pipes (generally with an outer diameter of 600 mm or less, such as sewer pipes) when laying pipes using the push-pipe construction method. This invention relates to an excavation direction correction device used in a small-diameter push pipe construction method that allows the propulsion direction to be corrected and allows for reliable and efficient anti-excavation.

[Problems to be solved by conventional techniques and ideas]

As disclosed in Japanese Patent Application Laid-Open No. 53-99806, a correction plate is provided on the outer periphery of the tip of the leading pipe and extends outward in the pipe length direction, and one of the correction plates can be selected and extended. Devices for correcting the direction of excavation are known.

As described above, there is a drawback that the direction of excavation cannot be easily corrected when the middle part of the guide pipe protrudes.

The present invention attempts to reliably correct the excavation direction at this point by tilting the claw plate that protrudes beyond the front end of the leading pipe, that is, the claw plate itself that actually leads and sticks into the soil. It is something.

In addition, such a correction device has a structure in which hydraulic cylinder devices are attached to the outer periphery of the excavation conduit in equal numbers to the number of correction plates, and one correction plate is extended by selecting and instructing the hydraulic cylinder devices to operate. The structure is extremely cumbersome and the operation is also complicated.

In this regard, in the present invention, both the hydraulic jack and its hydraulic jack operating part are installed in the pipe wall space of the leading pipe, and a locking plate is simply protruded from the excavation pipe, and one operating plate is selected by rotation of the excavation pipe. By adopting a structure that locks the locking plate, the structure that tilts the claw plate and the structure that selectively operates are simplified,
The aim is to ensure accurate operation.

[Means for solving problems]

This invention solves these drawbacks,
The configuration will be described in detail with reference to the accompanying drawings as follows.

The tip is located on the outer periphery of the tip of the excavation conduit 1 that rotates forward, and is provided at the forefront of the connected pipe 11 that is moved forward by the propulsion machine. Nail plate 4
is attached along the length of the leading pipe 3 so that the tip can be tilted slightly inward,
Hydraulic jack 5 that pushes up the rear part of each claw plate 4
and a hydraulic jack operating section 6 are provided inside the pipe wall of the guide pipe 3, and an operating plate 9 for operating each jack operating section 6 is made to protrude from the inner wall surface of the leading pipe 3. A matching locking plate 10 is provided protruding from the outer periphery of the excavation conduit 1, and the excavation conduit 1 is rotated.
The feature is that the inclination of the pawl plate 4 can be adjusted by selecting one of the two actuating plates 9 and moving it forward or backward to move the selected actuating plate 9 via the locking plate 10 and actuating the hydraulic jack 5. It is something to do.

〔Example〕

It will be explained in more detail.

The hydraulic jack actuating section 6 of this embodiment includes the leading pipe 3
There are plungers 7a and 7b at the front and rear of the interior at four locations on the left and right sides.
are arranged side by side, and an actuating plate 9 is attached to the plunger rod 8 that connects both sides, and this actuating plate 9 is pushed by a locking plate 10 attached to the excavation conduit 1, so that the plunger 7
The hydraulic jack 5 is actuated via a and 7b.

The propulsion device 2 in this figure is a boring machine, which moves the excavation conduit 1 forward at a low speed, and connects the leading pipe 3 and the connecting pipe 11 (huum pipe, steel pipe, etc.) connected to the leading pipe 3 with the drilling conduit 1. The excavation pipe 1 is moved forward at the same low speed, that is, the excavation pipe 1 moves forward while rotating, and the leading pipe 3 and the connecting pipe 11 only move forward without rotating.

Furthermore, the excavation conduit 1 shown in this figure is used in a jointed manner due to the limited space available for the manhole 12. This joint connection is achieved by installing flanges 13 at both ends of the excavation conduit 1, and connecting between the flanges 13. Bolts 14 are inserted therethrough, and the steel ball holding case 16 is interposed and fixed between the flanges 13 and the steel ball holding case 1 is connected to the flanges 13.
Eight steel balls 17 are stored in 6 so as to slide on the inner peripheral surfaces of the connecting pipe 11 and the leading pipe 3, and the excavation conduit 1 is rotatably supported on the axis of the connecting pipe 11. There is.

Further, reference numeral 18 is a center bit, and a mounting arm 19 fixedly protrudes from the inner circumferential surface of the excavation conduit 1 at the forefront.
On the other hand, reference numeral 20 is a cutter bit, and four fitting grooves 21 are formed on the outer peripheral surface of the excavation conduit 1 at the forefront, and a pivot pin 2 is attached to the fitting grooves 21.
2 is installed, and the bases of the four cutters 18 are pivotally connected to the pivot pins 22 so as to protrude freely up and down, and can be replaced by pulling out the pivot pins 22.

Reference numeral 23 denotes a soil discharge blade, which is formed by winding an angle material in a spiral shape, and is designed to discharge the excavated soil backward through the inner circumferential surface of the excavation conduit 1.
This may be done by other means.

Further, the leading pipe 3 has a conical recess at its tip, and the leading pipe 3 and the connecting pipe 11 are connected by forming a concave annular groove 24 at the end, and fitting a collar 25 into the concave annular groove 24. I am trying to connect them by doing this.

In addition, an auxiliary hole 26 is provided on the outer periphery of the tip of the excavation conduit 1.
is drilled.

Further, the claw plate 4 has fitting grooves 27 formed at four locations above and below the outer circumference of the leading tube 3, and is pivotally mounted to the fitting grooves 27 by a fulcrum pin 28 so as to be tiltable.

Further, the operation of the hydraulic jack actuator 6 stops the forward rotation of the excavation conduit 4, and manually rotates the excavation conduit 1 to a position where the locking plate 10 of the excavation conduit 1 engages with the actuation plate 9 at a desired position. If the excavation conduit 1 is moved forward manually and the actuating plate 9 is pushed forward by the locking plate at the rear, the oil in the plunger 7a will be released by the hydraulic jack as shown in the imaginary line in the upper part of FIG. The excavation conduit 1 flows into the head portion of the excavation conduit 1 through the conduit 29, pushes up the rear part of the claw plate 4, tilts the tip of the claw plate 4 slightly inward, and conversely retreats the excavation conduit 1 to lock the front part. When the actuating plate 9 is pulled backward by the plate 10, the oil in the plunger 7b flows into the rod portion of the hydraulic jack 5 via the conduit 29, pulls down the rear part of the pawl plate 4, and causes the pawl to enter the fitting groove 27. The plate 4 is retracted, and when the propulsion device 2 performs an excavation operation with the claw plate 4 lifted and activated, the operating plate 9 and the locking plate 10 are positioned at the excavation operation position shown in the upper part of FIG. , at this time, even if the actuating plate 9 is moved back to the neutral position, the claw plate 4
The hydraulic circuit is configured so that the claw plate 4 is not tilted and the claw plate 4 is locked in that state.

Reference numeral 30 is a target, which is used to confirm whether the direction of propulsion is straight by irradiating the laser beam.

In general, the promotion of small-diameter pipe construction methods is being carried out in response to changes in urban structure, road conditions, and difficulties in acquiring land. Therefore, there is a strong demand for labor saving.

In addition, the biggest difficulty in promoting this small-diameter pipe construction method is how to lay the connecting pipe 11 (huum pipe or steel ball) straight in the conduit, and automation in this aspect is expected. ing.

[Effect of idea]

Since the present invention is configured as described above to satisfy such a request, the leading pipe 3 is attached to the tip of the connecting pipe 11 (for example, a sewer pipe such as a fume pipe or a steel pipe), and the connecting pipe 11 With the excavation conduit 1 inserted into the guide pipe 3, the connecting pipe 11 and the guide pipe 3 are advanced at low speed by the propulsion device 2, and the excavation conduit 1 is advanced at low speed while rotating at a low speed. An excavation action occurs due to the action of the cutter bit 20 and the center bit 18, and the excavator is forced to flow into the excavation conduit 1, and is sequentially ejected backward by the action of the earth removal blades 23. After excavation is completed to the desired diameter and the first connecting pipe 11 is laid, the second excavating pipe 1 is extended and connected to the excavating pipe 1, and the connecting pipe 11 is
If the extension joint is made and the propulsion device 2 is operated again, the second connecting pipe 11 will be laid in the conduit.

At this time, if the direction of excavation propulsion of the leading pipe 3 is confirmed to be curved by, for example, a laser beam, due to changes in the strata such as soft, hard, gravel, or cobblestones,
Correction must be made immediately, but in such a case, check the pawl plate 4 at the position where the propulsion direction is to be corrected, and then move the pawl plate 4 to the hydraulic jack operating section 6.
If the hydraulic jack 5 is operated to tilt the tip slightly inward and the excavation is advanced again in this state, the penetration excavation conduction resistance will deviate by the amount that the claw plate 4 protrudes from the leading pipe 3. Therefore, the direction of propulsion of the leading pipe 3 is corrected, and since the claw plates 4 are attached at four locations on the left, right, top and bottom, the propulsion direction can be corrected in any of the left, right, top and bottom directions.
By tilting the two claw plates 4 at the same time, it is possible to make corrections in the intermediate directions of left, right, up and down, and the propulsion direction can be corrected very easily.

In this way, a method is adopted in which the direction of propulsion is corrected by tilting the claw plate 4 whose tip protrudes from the leading pipe 3, that is, the claw plate 4 that is located directly at the forefront and sticks into the soil. Therefore, correction can be made more accurately and quickly than in the conventional structure in which a member is simply provided in the middle of the leading pipe 3 to protrude outward.

Further, the claw plate 4 to be tilted is also provided in the pipe wall space of the hydraulic jack 5 and its hydraulic jack operating part 6, an operating plate 9 is provided protruding inward, and a locking plate 10 that engages with the operating plate 9 is provided. is provided protruding from the outer periphery of the excavation conduit 1, so that the actuating plate 9 can be selected by rotating the excavating conduit 1, and the actuating plate 9 can be moved by advancing and retracting the excavating conduit 1 to operate the hydraulic jack 5, unlike the conventional method. The excavation direction correction device used in the small-diameter push pipe construction method has a simpler structure and operation, and can be operated more accurately than a device that selectively operates a hydraulic cylinder device placed around the lead pipe. Become.

Moreover, since it has a simple configuration, it is suitable for mass production and can be manufactured at low cost.

As described above, according to the present invention, when laying a pipe using the small diameter pipe pushing method, a drilling direction correction device is provided which has excellent practical effects such as easily correcting the pipe pushing direction and enabling reliable and efficient tunnel excavation.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a usage state diagram, Fig. 2 is a vertical sectional view of the main part, Fig. 3 is a front view of the main part, and Fig. 4 is a view taken along A-A. It is a longitudinal cross-sectional view of a line. DESCRIPTION OF SYMBOLS 1... Excavation conduit, 2... Propulsion device, 3... Leading pipe, 4... Claw plate, 5... Hydraulic jack, 6... Hydraulic jack operating section, 9... Operating plate, 10... Locking plate , 11... Continuous pipe.

Claims (1)

[Scope of utility model registration request] Located on the outer periphery of the tip of the rotating and advancing excavation conduit,
At four locations on the outer periphery of the leading pipe, top, bottom, left and right, located at the forefront of the connecting pipe that is moved forward by the propulsion machine, claw plates with their tips protruding from the leading pipe are attached along the length of the leading pipe. A hydraulic jack for pushing up the rear part of each claw plate and a hydraulic jack operating part are provided inside the pipe wall of the leading pipe, and each jack operating part An actuating plate for actuation is made to protrude from the inner wall surface of the leading pipe, and a locking plate that engages with one of the actuating plates is provided protruding from the outer periphery of the excavation conduit, so that the excavation conduit can be rotated to one side.
A small-diameter push pipe characterized in that the inclination of the claw plate can be adjusted by selecting two actuating plates and moving the selected actuating plate through a locking plate and operating a hydraulic jack. Excavation direction correction device used in construction method.