JP2002168083A - Driving machine for small aperture pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive machine for a small aperture pipe having a construction capable of improving the workability during the couping and division of a plot body. SOLUTION: A pedestal 22 is provided at one end plate 9b of a neighboring divided pilot body in a movable and tiltable manner in a direction normal to the drive direction. A piping guide portions such as a coupler 23 and a guide pin 17 or the like are provided at the pedestal 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried pipe connected to a leading conductor having a digging device at the tip, and the buried pipe is pressed by a main pushing device installed in a starting stand to bury the leading pipe together with the leading conductor. The present invention relates to a small-diameter pipe excavator for excavating and embedding a pipe.

[0002]

2. Description of the Related Art As a method of burying a pipe such as a water pipe or a cable buried pipe in the ground, a method called a pipe excavation method has been conventionally known. This method involves excavating a leading conductor having a digging device and a buried pipe sequentially connected to the leading conductor from the starting standing pier, and when the leading conductor reaches the reaching pier, recovers the leading conductor with the reaching pier, and buries it. Leave the tube underground. Therefore, the starting resistance needs to be large enough to dispose the leading conductor and the pushing device. In addition, the reaching resistance needs to be large enough to collect the leading conductor.

The leading conductor has a structure divided into a plurality of parts in the direction of excavation for the following reason.
The excavation method is generally constructed under the road,
It is desirable to be able to work with as small a stand as possible so as to alleviate traffic congestion during construction and not to disturb local residents. In addition, a compact machine is desired to reduce the vertical excavation cost. However, the outer diameter of the leading conductor is determined by the diameter of the buried pipe, and the width of the main pressing device also needs to be constant depending on the diameter of the pipe. For this reason, downsizing is performed mainly in the direction of shortening the length.

[0004] Although the tip conductor is desired to be compact,
On the other hand, in order to excavate at high speed and with high accuracy in order to cope with various types of soils, it is necessary to incorporate as large an excavator, earth removal device or high-accuracy surveying device as possible in the conductor, greatly shortening the length. Is difficult to achieve. Therefore, a structure in which the leading conductor can be divided at least at the time of starting and at the time of reaching is adopted for small-sized standing use. Japanese Patent Application Laid-Open No. Hei 10-37671 discloses an example in which the leading conductor is divided and collected, and Japanese Patent Application Laid-Open No. 2000-38897 discloses an example in which the leading conductor is divided when starting.

FIGS. 7A and 7B are views showing a conventional split structure of a leading conductor. In FIG. 7, reference numerals 50 and 51 denote a front body and a rear body of the divided front conductor, which are end portions 52,
At 53, the outer peripheral flange is connected by bolts 54. Guide portions (guide pins and guide holes) 56 for alignment with a hydraulic pipe to a hydraulic motor which is a driving device of the excavator and a hydraulic pipe to a hydraulic cylinder for adjusting the excavation direction are provided at the ends 52 and 53. Are provided. The illustrated example shows an example in which the front trunk 50 is divided from the rear trunk 51 in the arrival standing, the front trunk 50 is suspended by a crane 57 from the ground, the bolt 54 is removed, and the crowbar 58 is connected to the ends 52, 53.
Split while prying in between.

[0006]

In the leading conductor structure having the coupling and splitting structure as described above, the joint 55 is provided with a quick coupler for automatically connecting the oil passage by coupling, so that the coupling and dividing work can be performed. Could be simplified. However, the coupler 55 has an extremely small allowable eccentricity due to its structure. Therefore, when the rear body 51 is hung by a crane in a narrow starting stand and the joining operation is performed, the front body 50 and the rear body 51 are appropriately adjusted. It is difficult to adjust to a proper position, and high accuracy is required for positioning.

[0007] In addition, there are many obstacles to the suspension work, such as the support of an existing buried object or a standing wall (H-section steel, etc.), and the suspension position cannot always be adjusted to the center of gravity. Not exclusively. When the suspended position and the position of the center of gravity are displaced, the tip conductor suspended by one of the divided cranes is inclined, and the connection becomes more difficult. In the case of the division work as shown in FIG. 7, when the suspension position is shifted from the position of the center of gravity, the leading conductor tries to rotate as shown by the arrow R, and a shear force acts on the guide pin of the guide portion 56 for positioning. I do. For this reason, a thick guide pin that can withstand the shearing force is required as the guide pin, and a large space is required for arrangement in the machine.

In the case where the split portion is split while being pryed with a burl 58 as shown in FIG. 7B, the leading conductor can only be tilted by the allowable gap of the guide pin. As described above, in a structure in which the guide pin can be tilted only by the allowable clearance, the coupler 5
Since the allowable eccentricity of 5 is small, the tilt angle cannot be large,
Poor workability.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a small-diameter pipe excavator having a structure capable of improving the workability at the time of coupling and splitting of a conductor.

[0010]

According to the first aspect of the present invention, there is provided a small-diameter pipe excavator in which a buried pipe is connected to a leading conductor having a drilling device at a tip, and a main pushing device installed in a starting stand. And presses the buried pipe to excavate the buried pipe together with the leading conductor, and embeds the leading conductor so that the leading conductor can be divided into a plurality of pieces in the direction of excavation. In a small-diameter pipe excavator provided with a fluid pipe joint and a guide portion for aligning the joint on a plate, one of the end plates connected to each other is movable and tiltable in the vertical direction of the excavation direction. A pedestal, and the fluid pipe joint and the guide portion are provided on the pedestal.

Thus, the joint and the guide are provided on the base,
If this is made movable in the direction perpendicular to the excavation direction and can be tilted, even if there is a slight displacement between the divided leading conductors at the time of coupling, the pedestal moves due to the action of the guide part and the joint Male and female joints can be aligned, and joints can be connected without the need for high-precision alignment. In addition, when one of the leading conductors suspended by a crane or the like is inclined at the time of this alignment, the pedestal is also inclined by the guide action of the guide portion, so that the joint can be easily connected. As described above, since high-precision alignment is not required at the time of joining the divided leading conductors, workability is improved.

In addition, when a rotational force is applied due to the displacement of the center of gravity of the divided conductor supported by a crane or the like at the time of dividing the leading conductor, the pedestal is tilted, so that no load is applied to the guide portion.
The member constituting the guide portion can be a small member.

In the case where the division is performed while the division is twisted with a crowbar or the like, the pedestal can be inclined, so that the inclination angle between the conductors to be divided can be increased. For this reason,
Division becomes easy, and workability at the time of division is also improved.

According to a second aspect of the present invention, there is provided a small-diameter pipe excavator according to the first aspect, wherein the movable pedestal is provided on the end plate, a bolt for preventing the pedestal from projecting to the mating end plate, and the pedestal is connected to the mating end. Attached by a compression spring that presses toward the end plate.

If the pedestal is movably attached to the end plate by the bobbin and the compression spring as described above, the pedestal generated by bending of a pipe such as a hydraulic hose connected to the pedestal when the divided conductor is connected. Can be prevented from being tilted or moved, and the pedestal can be fixed at a place where it should be, thereby facilitating the connection.

[0016]

FIG. 1 is a sectional view showing an embodiment of a small-diameter pipe excavator according to the present invention. In the figure, 1 is a starting stand, 2 is a main pushing device installed on the starting stand 1, 3 is a front trunk 3
a and the rear conductor 3b. The front body 3a has a first body 6 having a disc-shaped excavator 4 and a hydraulic motor 5 for rotating the same, and a second body 6 in which the first body 6 is tiltably connected by three or more hydraulic cylinders 7. And a torso 8.

The front trunk 3a and the rear trunk 3b are joined at a dividing part 9. An opening 1 provided in the body is provided in the rear body 3b.
An earth removal pump 12 composed of a hydraulic piston pump or the like that discharges excavated earth and sand introduced from 0 to the ground via an earth removal hose 11 is built in. A buried pipe 13 is detachably connected to the rear trunk 3b. In the present invention, the buried pipe 13 has an inner diameter of 8
The target is 0 mm or less.

In this small-diameter pipe excavator, first, the front body 3a is
The excavator 4 is rotated by the hydraulic motor 5 and excavated while being pressed by the main pushing device 2. When the front trunk 3 a is almost buried in the ground, the rear trunk 3 b is joined at the dividing part 9,
The leading conductor 3 is pushed again by the former pushing device 2 and the excavator 4 is rotated by the hydraulic motor 5 to excavate. At this time,
Drilling tool 4 through mud (liquid) through hose (not shown)
The mixed mud of mud-producing agent and earth and sand generated by excavation is introduced through the outer peripheral surface of the front body 3a and is introduced into the rear body 3b from the opening 10 of the rear body 3b. As a result, digging is performed while discharging to the ground through a discharging hose 14 connected to the discharging pump 12. After that, the buried pipes 13 of a predetermined length are sequentially added and excavated in the same manner as described above.

The hydraulic hose 5 and the hydraulic cylinder 7
Are accommodated in the buried pipe 13 and the conductor 3. Since a pressure loss occurs at the joint portion of the hydraulic hose, the hydraulic hose is added one by one every several buried pipes 13 in order to minimize the joint portion. In order to reduce the number of these hydraulic hoses as much as possible, the two hydraulic hoses go back and forth with respect to the plurality of hydraulic cylinders 7 in the front body 3a and pass through the rear body 3b and the buried pipe 13 so as to be connected to the front body 3a. Two hydraulic hoses are selectively connected to only one of the individual hydraulic cylinders 7 by an electromagnetic valve provided in 3a.

Further, in order to check whether or not the excavation is performed in a straight line, a laser beam is emitted from the main pressing device 2 to the front conductor 3 and received by a light receiving element provided on the front conductor 3 side. The degree of straight traveling is determined based on the light receiving state.
A cable for transmitting a light receiving signal to the ground and a cable for transmitting a signal of a sensor for detecting the degree of inclination of the first trunk 6 with respect to the second trunk 8 are passed through the leading conductor 3 and the buried pipe 13. These parts are connected to each other in the divided part 9 through openings (not shown) provided in the end plates 9a and 9b, with a margin in length at a connecting part.

FIG. 2 is a sectional view showing a basic configuration of an embodiment of the dividing section 9 in a divided state. In FIG. 2, 9
Reference numerals a and 9b denote end plates provided as constituent members of the dividing portion 9. One end plate 9a provided at the rear end of the front trunk 3a
The female coupler 1 of the quick coupler to which the hydraulic motor 5 or the hydraulic hose 15 for the hydraulic cylinder 7 is connected
6 and a guide hole 18 for a guide pin 17 are provided. A plurality of (preferably 8 to 12) holes 19 through which a plurality of (preferably 8 to 12) bolts 20 are inserted are formed in the flange portion 19 on the outer periphery of the end plate 9a.
a is provided.

A concave portion 21 is provided on a surface of the end plate 9b provided at the front end of the rear trunk 3b, facing the end plate 9a.
1 is accommodated in the pedestal 22 so as to be movable in the direction perpendicular to the excavation direction, that is, up, down, left and right, and tiltable. A guide pin 17 having a tapered tip 17a to be inserted into the guide hole 18 is fixed to the pedestal 22, and a male coupler 23 of a quick coupler is fixed. A hydraulic hose 24 for the hydraulic motor 5 or the hydraulic cylinder 7 is connected to the male coupler 23. Rear trunk 3b
A screw hole 25a into which the bolt 20 is screwed is provided at a position corresponding to the hole 19a of the flange 19 at the outer peripheral flange 25 of the end plate 9b.

The male and female couplers 16, 23 correspond to two hydraulic hoses for the hydraulic motor 5 and two hydraulic hoses shared for the hydraulic cylinder 7, for a total of four pairs. Although they are provided, they are represented by one pair.

FIG. 3 shows a state in which the front body 3a and the rear body 3b are connected. In this state, the valve bodies 16 of the couplers 16 and 23 are connected.
The inner space portions of both couplers communicate with each other by the a and 23a being pressed against each other against the compression springs 16b and 23b. A seal 16c is provided on the inner wall of the male coupler fitting portion of the female coupler 16 so as not to leak the fluid to the outside in the coupled state.

Here, in order to ensure the sealing performance of the coupler, only a slight dimension of the misalignment (less than the seal crush amount) is allowed. In order to align the coupler, the following relationship must be satisfied. A1 <A2 B2 <B1 <Seal crushing amount where A1: coupler insertion allowance, A2: guide pin 17
B1: a gap between the fitting portions of the male coupler 23 and the female coupler 16, and B2: a gap between the guide pin 17 and the guide hole 18.

The coupling of the leading conductor at the dividing portion 9 is performed as follows. The front body 3a and the rear body 3b are roughly positioned,
When approaching, the guide pin 17 is moved to the end plate 9a of the front body 3a.
Contact Then, as shown in FIG.
7 is inserted into the guide hole 18. Here, guide pin 1
7. Since the male coupler 23 is fixed to the pedestal 22, the male and female couplers 16 and 23 can be centered by fitting the guide pin 17 and the guide hole 18. Also,
Since the pedestal 22 is disposed in the rear trunk 3b so as to be movable and tiltable in the in-plane direction of the end plate 9b, even if the positions of the front trunk 3a and the rear trunk 3b are shifted, as shown in FIG. Only the pedestal 22 moves or tilts with respect to the end plate 9b of the rear trunk 3b,
The alignment of the couplers 16 and 23 can be easily performed without applying a large stress to the guide pin 17.

After coupling the couplers 16 and 23 in this manner, as shown in FIG. 5, the end plates 9a and 9b are aligned, and the bolt 20 is inserted through the hole 19a and screwed into the screw hole 25a of the flange portion 25. By tightening, the front trunk 3a and the rear trunk 3b are joined.

When the front trunk 3a and the rear trunk 3b are divided by hanging the front trunk 3a or the rear trunk 3b with a crane, the bolts 20 that fasten the two are first removed. At this time, the flange portions 19 and 25 of the front trunk 3a and the rear trunk 3b are still in contact with each other, and if the suspension position of the front trunk 3a or the rear trunk 3b is shifted from the center of gravity, the front trunk 3a or the rear The torso 3b is about to rotate. For this reason, according to the conventional configuration, a shear force is applied to the guide pin. However, in the configuration according to the present invention, the guide pin 17 and the male and female couplers 16 and 23 are attached to the pedestal 22, and the pedestal 22 moves following the rotation, so that no shear force is applied to the guide pin 17. Therefore, the guide pin 17 can be constituted by a small member.

When a crowbar is inserted into the dividing portion 9 and prying, the guide pin 17 and the male and female couplers 16 and 23 are attached to the base 2.
2 attached. Since the pedestal 22 can be tilted, an excessive force is not applied to the guide pin 17, the division is facilitated, and the workability is improved. The tilt angle of the pedestal 22 can be increased as needed.

FIG. 6 is a sectional view showing another embodiment of the present invention. In the present embodiment, a pedestal 22 accommodated in the concave portion 21 of the end plate 9b is provided with a bolt 26 for preventing the pedestal 22 from protruding to the mating division, and the pedestal 22 is connected to the mating end plate 9a.
It is attached by a compression spring 27 pressing to the side.
The head 26a of the bolt 26 is fitted into the recess 22a of the pedestal 22 which is larger than the head 26a, and the shaft of the bolt 26 is inserted through the fool hole 22b of the pedestal 22. The pedestal 22 can be tilted with respect to the end plate 9b by being movable in the direction, that is, the vertical direction of the excavation direction, and by forming a gap g between the end plate 9b and the pedestal 22.

As described above, if the pedestal 22 is movably attached to the end plate 9b by the bolt 26 and the compression spring 27,
The head 26a of the bolt 26 is pressed against the concave portion 22a to maintain the posture and position of the pedestal.
When connecting b), the inclination and movement of the pedestal caused by bending of the piping such as the hydraulic hose 25 connected to the coupler 23 of the pedestal can be prevented, and the pedestal can be fixed at a desired position. It will be easier. For this reason, workability at the time of joining is improved.

In practicing the present invention, a configuration may be adopted in which guide pins 17 are provided on the front body 3a and guide holes 18 are provided in the pedestal 22 of the rear body 3b. Further, the base 22 may be provided on the front trunk 3a. Further, there are no restrictions on the division position of the leading conductor 3 and the number of couplers and guide pins. Also,
The present invention can also be applied to a case where a pipe is dug up and buried under the ground.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a small-diameter pipe excavator according to the present invention in a working state.

FIG. 2 is a sectional view showing an embodiment of a divided portion of a leading conductor according to the present invention in a divided state.

FIG. 3 is an enlarged cross-sectional view showing a combined state of divided portions in the embodiment of FIG.

FIG. 4 is a cross-sectional view showing a state before the division portions of the present embodiment are combined.

FIG. 5 is a cross-sectional view showing a state where the connection is further advanced from the state of FIG. 4;

FIG. 6 is a cross-sectional view of a divided part according to another embodiment of the present invention.

FIG. 7A is a side view showing a divided portion of a conventional leading conductor,
(B) is a side view showing the state at the time of division.

[Explanation of symbols]

1: Start standing resistance, 2: Main pushing device, 3: Lead conductor, 3a: Front trunk, 3: Rear trunk, 4: Drilling tool, 5; Hydraulic motor, 6, First
, 7: hydraulic cylinder, 8: second cylinder, 9: split part,
9a, 9b: end plate, 10: opening, 11: drain pipe, 1
2: earth removal pump, 13: buried pipe, 14: earth removal hose, 1
5: hydraulic hose, 16: female coupler, 17: guide pin,
18: guide hole, 19: flange, 20: bolt, 2
1: recess, 22: pedestal, 23: male coupler, 24: hydraulic hose, 25: flange, 25a: screw hole, 26: bolt, 27: compression spring

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masami Oki 650 Kandamachi, Tsuchiura-shi, Ibaraki F-term in Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 2D054 AC18 AD28 BB08 DA12 DA15 EA01

Claims (2)

[Claims] 1. A buried pipe is connected to a leading conductor having a digging device at its tip, and the buried pipe is dug with the leading conductor by pressing the buried pipe by a main pushing device installed in a starting stand. Wherein the leading conductor is configured to be able to be divided into a plurality in the excavation direction, an end plate for coupling the divided leading conductors, a fluid piping joint, and a guide portion for positioning the joint. In a small-diameter pipe excavator provided with a base, a pedestal is provided on one of the end plates coupled to each other so as to be movable and tiltable in a vertical direction of the excavation direction, and the fluid pipe joint and the guide portion are provided on the pedestal. A small diameter pipe excavator characterized by being provided. 2. The end plate according to claim 1, wherein the movable pedestal is fixed to the end plate by a bolt for preventing the pedestal from projecting to a mating end plate, and a compression spring for pressing the pedestal to the mating end plate. A small diameter pipe excavator characterized by being attached.