JPH0233840B2 - SUISHINKOHONOHENIKYOSEISOCHI - Google Patents

Description

[Detailed Description of the Invention] This invention provides a shoe at the front end of a pipe to be buried underground, such as a humid pipe, an electric wire, a steel pipe for burying telephone lines, a water pipe, etc., and an auger is placed inside the pipe. , relates to a deviation correction device for a propulsion construction method in which the pipe is pushed forward and dirt and stones are removed by an auger.

In the propulsion method, the pipe may deviate from a predetermined propulsion direction, and in order to correct this deviation, the following deviation correction devices have been proposed.

That is, a plurality of hydraulic cylinders are arranged in the circumferential direction at the front end of the tube to swing the shoe relative to the tube, and when deviation occurs, the shoe is swung in a direction to cancel the deviation. The device was patented in 1982.
It has been filed as No. 16186 (Japanese Unexamined Patent Publication No. 115497/1983). However, this deviation correction device had the following problems.

(i) Because the hydraulic cylinder is installed at the front end of the pipe, the structure of the front end of the pipe is complicated, and the hydraulic hose that supplies hydraulic pressure to the hydraulic cylinder must be extended to the rear end of the pipe, so the hydraulic hose needs to be extended every time a pipe is added. The troublesome work of reconnecting is required.

(ii) An inner pipe is provided between the pipe and the auger to protect the hydraulic hose, but the structure of the front end is complicated, so the inner diameter of the shoe is small, and the inner diameter of the inner pipe is accordingly small. The inner diameter also becomes smaller, making it difficult to remove large-diameter gravel.

(iii) When correcting deviation, the ground must be pushed away using a shoe, but the capacity of the hydraulic cylinder is limited because it must be installed at the front end of the pipe, and correction of deviation is difficult if the ground is strong. It may happen.

(iv) When the auger is projected further forward than the shoe, the shoe may be rotated by the earth and sand rotating with the auger, but in this case, the correspondence between each hydraulic cylinder and the deflection direction will change. However, the deviation from the ground may not be corrected properly.

(v) For example, four hydraulic cylinders are provided, and even if it is possible to oscillate the shoe in the direction in which the hydraulic cylinders are arranged, it is not easy to oscillate in the direction between the hydraulic cylinders.

This invention was devised in order to solve these conventional problems, and it is possible to easily and reliably correct deviation, has a simple structure, and does not cause problems when adding pipes. The purpose of this invention is to provide a position correction device.

In the deviation correction device according to the present invention, the shoe is attached to the front end of the tube so that it can move forward and backward within a predetermined range and swingable with respect to the tube, the inner tube is inserted between the tube and the auger, and the front end of the inner tube is an inclined surface that is inclined with respect to the rear end surface of the shoe and is opposed to the rear end surface of the shoe, a first flange is provided on the outer periphery of the front end of the inner tube, and the first flange is provided on the inner surface of the inner tube. A second flange is provided behind the flange of the pipe, and a spring having an elastic force extending in the axial direction of the pipe is interposed between the first and second flanges, and the spring and at least one flange are interposed between the first and second flanges. A thrust bearing is interposed between the first flange, and a first projecting piece is provided on the front surface of the first flange at a position equally dividing the central angle,
The tube is provided with a second protrusion corresponding to this protrusion, and when the tube is propelled (not straightened), the first and second protrusions are butted against each other to absorb the spring force applied to the inner tube. I'll take it at When correcting deviation, the drive device at the rear end of the inner tube slightly retracts the inner tube to release the contact between the protrusions and rotate the inner tube, causing the tip of the inclined surface of the inner tube to deviate. When the inner tube is released from being drawn in, the tip of the inclined surface of the inner tube comes into contact with the rear end surface of the shoe due to the elastic force of the spring, pushing out the shoe, tilting the shoe and deflecting it. This is to correct the position.

Furthermore, in the deviation correction device according to the second invention, in addition to the configuration of the first invention, a spherical bearing is interposed between the outer periphery of the shoe and the inner periphery of the tube, and the spherical bearing is attached to the tube. On the other hand, the shoe is freely movable in the axial direction, so that the shoe can be moved in the axial direction within a predetermined range with respect to the tube, and the elastic force of the spring applied to the shoe is used for the forward movement of the shoe and eccentricity of the shoe within the predetermined range.

Next, an embodiment of the deviation correction device according to the first invention will be described based on the drawings.

In FIG. 1, a cylindrical support casing 2 is fixed to the front end of a pipe 1 to be buried underground, and an annular shoe 3 is supported by the support casing 2. A flange 4 protruding inward is provided at the front end of the support casing 2, and a flange 4 is provided at the front end of the support casing 2.
is surrounded by a support casing 2 at its rear half. A spherical surface 5 is formed in a portion of the shoe 3 that faces the inner circumferential surface of the flange 4, and as this spherical surface 5 contacts the inner surface of the flange 4, the shoe 3
is said to be able to swing. A flange 6 projecting outward is provided at the rear end of the shoe 3, and this flange 6 faces the flange 4. A spring receiving hole 7 that opens toward the flange 4 is bored in the flange 6, and a compression coil spring 8 is accommodated in the spring receiving hole 7. Spring 8 is spring receiving hole 7
and the rear surface of the flange 4, whereby the shoe 3 is biased rearward with respect to the support casing 2. A tapered surface 9 that becomes smaller in diameter toward the rear is formed on the outer periphery of the rear end of the flange 6, and a tapered surface 10 that contacts the tapered surface 9 and a flat surface that is in contact with the rear end surface of the flange 6 is formed on the front end of the tube 1. ing. Therefore, when propelling tube 1,
The tube 1 abuts the shoe 3 at the front end plane and tapered surface 10, and can push the shoe 3 while preventing the shoe 3 from swinging. The rear end surface of show 3 is tube 1
When the flange 4 is in contact with the front end surface of the flange 4,
A gap D is provided between the tubes 6 and 6, and the shoe 3 can move forward and backward with respect to the tube 1 within this gap D. An inner tube 11 is inserted inside the tube 1, and the front end surface of the inner tube 11 forms an inclined surface 1 that is inclined with respect to the rear end surface of the shoe 3.
It is said to be 2. A sleeve 13 made of an elastic material such as rubber is fitted on the inner periphery of the rear end of the shoe 3.
This sleeve 13 extends to the inner surface of the front end of the inner tube 11. This allows the auger (not shown)
This prevents dirt and stones removed from entering between the shoe 3 and the inner pipe 11. The sleeve 1 is also made of an elastic material such as rubber on the outer periphery of the front end of the shoe 3.
4 is fitted, and this sleeve 14 extends to the outer periphery of the front end of the support casing 2. This prevents dirt and stones from entering between the shoe 3 and the support casing 2. A ring 15 is arranged inside the sleeve 14, which allows the sleeve 1 to
4 is supported against earth pressure from the outside.

The inner tube 11 can slide back and forth and rotate relative to the tube 1, and in order to facilitate this sliding, grease is sealed between the front end of the inner tube 11 and the tube 1. .

A first flange 16 is provided protruding from the front outer periphery of the inner tube 11, and a second flange 17 is provided protruding from the inner periphery of the tube 1 behind the flange 16. A plurality of springs 18 and washers 1 are provided between the flanges 16 and 17.
9. Thrust bearings 20 are successively interposed, and compressive force is applied to the spring 18. A seat surface 21 is formed on the inner circumference of the tube 1 and is located in front of the flange 16 and faces the flange 16.Protrusions 22 are protruded from the seat surface 21 at positions that divide the central angle into quarters, for example. It is set up. A protruding piece 23 is provided on the front surface of the flange 16 in a manner corresponding to the protruding piece 22, and in the state shown in FIG. 1, the protruding pieces 22 and 23 are in contact with each other.

As shown in FIG. 2, the projecting piece 22 is formed into a pentagonal shape when viewed in the radial direction, and as shown in FIG.
4 is formed. When the protruding pieces 22 and 23 are in contact with each other, that is, when they are being propelled (when not being straightened), the top surface of the protruding piece 22 engages with the V-groove 24, thereby causing the tube 1 of the inner tube 11 to
Rotation relative to the tube is prevented, and the tube 1 and the inner tube 11 are propelled in a fixed state. However, when correcting the deviation, if the inner tube 11 is pulled rearward with respect to the tube 1 and the protruding piece 23 is separated from the protruding piece 22, the rotation of the inner tube 11 with respect to the tube 1 becomes possible, and the inner tube 11 can be rotated with respect to the tube 1. tube 11,
That is, the inclined surface 12 can be rotated. Spring 1 here
8 is supported by the flange 17 via a washer 19 and a thrust bearing 20, the spring 18 can freely rotate relative to the tube 1, and therefore the inner tube 11 can easily rotate relative to the tube 1. . Then, at a position where the protruding piece 23 does not oppose the protruding piece 22, the inner tube 1
When the force pulling the shoe 1 backward is released, the inner tube 11 is pushed forward by the elastic force of the spring 18, and the inclined surface 12 pushes the rear end surface of the shoe 3. Here is the inner tube 11
The forward stroke of is regulated by the protruding piece 22 abutting against the flange 16 or by the protruding piece 23 abutting against the seat surface 21.

If the projecting pieces 22 and 23 were not provided here, when the tube 1 is propelled (when not straightened), the inner tube 1
1 must always be pulled backwards, which complicates construction work. Therefore, the projecting pieces 22 and 23 are extremely effective in practice.

When the inclined surface 12 is brought into contact with the rear end surface of the shoe 3 by the spring 18, the tapered surface 9 of the shoe 3
is separated from the tapered surface 10 of the tube 1, allowing the shoe 3 to swing. The shoe 3 receives the reaction force from the ground from the front while being guided by the slope 12.
It is inclined in the direction along the inclined surface 12. If the tube 1 is propelled in this state, the deviation will be corrected.

Here, the forward stroke of the inner tube 11 with respect to the tube 1 is regulated by the height of the projections 22 and 23, so that the inner tube 11 does not advance excessively with respect to the tube 1. On the other hand, if the forward stroke of the inner tube 11 is excessive, the inner tube 11 may push the front end of the tube 1 forward, and at this time, a force that may separate the joint of the tube 1 may be generated. .

As is clear here, when making corrections and canceling corrections, since the inner tube is pulled backwards, compression is applied to the outer tube. However, since the outer pipe has sufficient strength against compressive loads due to its nature, it will not cause any problems during construction.

In other words, it is extremely meaningful to operate the inclined surface by the elastic force of the spring.

Furthermore, according to the present device, even if there is a large deviation and measurement of the amount of deviation becomes impossible, correction is possible. That is, by pulling the inner tube 11 beyond the spring compression amount, the first flange 16 surface is brought into contact with the washer 19, and the tube 1 can be moved to the position before deflection.
In other words, when propulsion with a large deviation is performed, it is possible to once retract the tube 1 and correct the deviation again.

Note that the protrusions 22 and 23 are not limited to this embodiment, but may have other shapes in which the opposing surfaces can be engaged, or may be simply flat surfaces.
It is also possible to change the number of three. However, in order to ensure that the inner tube 11 is supported by the protrusions 22 and 23, the protrusions 22 and 23 must be arranged so as to equally divide the central angle.

As shown in FIG. 4, at the rear end of the inner tube 11,
A sleeve 25 is fixed, and a plurality of protrusions 26 are arranged in the circumferential direction on the outer periphery of the sleeve 25. Hook the tool 27 onto this protrusion 26 and remove the sleeve 2.
5 in the circumferential direction, the inner tube 11 can be rotated. Note that it goes without saying that the inner tube 11 can be rotated using other drive means such as a hydraulic cylinder without using the tool 27. A sleeve 28 is fixed to the rear end of the tube 1, and the sleeve 28 is pushed forward by a jack 29. sleeve 2
A jack 30 for pulling the sleeve 25 backward is fixed to the inner surface of the sleeve 28, and a plurality of through holes 31 for inserting the tool 27 are arranged in the circumferential direction of the sleeve 28.

The following steps will be taken when implementing the propulsion method.

(a) The shaft 33 of the auger 32 is hollow, and a light emitting element 34 is provided at the center of the front end of the shaft 33.
4 is detected by the light receiver 35 and displayed on the display meter 36, thereby detecting the deflection direction of the tube 1 (in the direction of arrow A). (Fig. 5) (b) Pull the inner tube 11 backward by the jack 30, separate the protruding piece 22 from the protruding piece 21, and in this state, move the inclined surface 1 forward in the direction of deflection of the tube 1.
The inner tube 11 is rotated in the circumferential direction by a driving means such as a tool 27 so that the inner tube 2 is inclined. (Fig. 6) (c) Release the traction force of the jack 30 and release the spring 1.
The inner tube 11 is advanced by the elastic force of 8, and the shoe 3 is pushed by the inclined surface 12. As a result, the shoe 3 swings in the direction opposite to A (in the direction of arrow B), and if the shoe 3 is moved forward together with the inner tube 11, the deviation is corrected. (Fig. 7) In this way, the deviation correction device does not have a driving source at the front end of the tube, so the structure is simple and the tube
Since the shoe 3 is swung by the reaction force of the ground without interfering with the addition of parts, deviation can be easily and reliably corrected.

FIG. 8 shows a first embodiment of the second invention, which differs from the embodiment of the first invention in the manner in which the shoe 3 is supported by the support casing 2. In the drawings, the same or equivalent parts as in the embodiment of the first invention are designated by the same reference numerals.

The support casing 2 has a pair of front and rear flanges 3 instead of the flange 4 in the embodiment of the first invention.
7, 38, and between these flanges 37, 38 a sliding ring 39 is arranged which is shorter by l than the distance between the two flanges. The sliding ring 39 is in slidable contact with the inner surface of the support casing 2 and can slide back and forth within a distance l. A spherical bearing 40 is interposed between the inner periphery of the sliding ring 39 and the outer periphery of the shoe 3, and the shoe 3 is supported by the spherical bearing 40 so as to be able to swing freely. By providing the structure that allows the shoe 3 to swing and the structure that allows the shoe 3 to move back and forth, the swing mechanism of the shoe 3 can be made smooth. When correcting deviation, spring 1 applied to shoe 3
The elastic force of 8 advances the sliding ring 39 and is used as a force for pushing the shoe 3, separating the tapered surfaces 9 and 10 and separating the rear end of the shoe 3 from the flat surface of the tube 1. Further, the amount of extension L of the spring is set larger than the distance l, so that when the shoe 3 moves forward by the distance l and becomes unable to move further, (L-
Since the elastic force of the spring corresponding to the distance 1) acts on the shoe 3 and is used for swinging, it is easy to tilt the shoe 3.

In this embodiment, as in the embodiment of the first invention, flanges 16 and washers 19 are provided at both ends of the spring 18.
are arranged respectively, but in this example,
An annular stopper 41 that protrudes long toward the washer 19 is provided on the outer periphery of the flange 16.
9 is provided with an annular stopper 42 that faces this stopper 41, and when a large deviation exceeding the measurement range occurs, the inner tube is pulled and the stoppers 41 and 42 are brought into contact with each other, and the tube is retracted. and then re-revise it.

As described above, the deviation correction device according to the present invention includes a shoe attached to the front end of the tube so that it can move forward and backward within a predetermined range and swingable relative to the tube, an inner tube inserted between the tube and the auger, The front end surface of the inner tube is made to be an inclined surface with respect to the rear end surface of the shoe, and is opposed to the rear end surface of the shoe, and when correcting deviation, the inner tube is appropriately rotated by a drive device at the rear end of the inner tube. The inclined surface is tilted forward in the direction of deviation, the inner pipe is brought into contact with the rear end face of the shoe, and the deviation is corrected by the reaction force of the ground, so the deviation can be corrected easily and reliably. The structure is simple, and
Moreover, it does not cause any problem in adding pipes.

In the deviation correction device according to the first invention, a first flange is provided on the outer surface of the front end of the inner tube, and a second flange is provided on the inner surface of the tube rearwardly than the first flange. First of all,
A spring with an elastic force extending in the tube axis direction is interposed between the second flanges, a thrust bearing is interposed between the spring and at least one of the flanges, and the front surface of the first flange is A first protruding piece is provided at a position that equally divides the central angle, a second protruding piece is provided on the tube corresponding to this protruding piece, and when the tube is propelled, the first and second protruding pieces are butted against each other. The spring force applied to the inner tube is received by the tube, and when correcting the deviation, the protrusions are released from contact with each other and the spring force pushes the shoe, thereby regulating the forward stroke of the inner tube when correcting the deviation. Therefore, the spring force does not act to separate the tube connections.

Furthermore, in the deviation correction device according to the second invention, in addition to the configuration of the first invention, a spherical bearing is interposed between the outer periphery of the shoe and the inner periphery of the tube, and the spherical bearing is attached to the tube. On the other hand, as the shoe is freely movable in the axial direction, it is possible to move the shoe in the axial direction within a predetermined range with respect to the tube, and the elastic force of the spring applied to the shoe is used to move the shoe forward and swing the shoe in the predetermined range, so it is reliable. It is possible to perform deviation correction.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the deviation correction device according to the first invention, FIG. 2 is a perspective view showing a first protrusion in the embodiment, and FIG. FIG. 4 is a schematic longitudinal sectional view showing the driving means in the same embodiment; FIGS. 5 to 7 are overall longitudinal sectional views showing the operation of the embodiment in sequence; FIG. The figure is a longitudinal sectional view showing an embodiment of the deviation correction device according to the second invention. 1...Pipe, 2...Support casing, 3...Show, 4...Flange, 5...Spherical surface, 6...Flange, 7...Spring receiving hole, 8...Compression coil spring,
9, 10... Tapered surface, 11... Inner tube, 12...
Inclined surface, 13, 14... Sleeve, 15... Ring, 16... First flange, 17... Second flange, 18... Belleville spring, 19... Washer, 20...
...Thrust bearing, 21...Seat surface, 22,2
3... Projection piece, 24... V groove, 25... Sleeve,
26... Projection piece, 27... Tool, 28... Sleeve, 29, 30... Jacket, 31... Through hole,
32... Auger, 33... Axis, 34... Light emitting element, 35... Light receiver, 36... Display meter, 37,3
8...Flange, 39...Sliding ring, 40...
Spherical bearing, 41, 42...stopper.

Claims (1)

[Claims] 1. A propulsion method in which a shoe is provided at the front end of a pipe to be buried underground, an auger is placed inside the pipe, and the auger removes dirt and stones while pushing the pipe forward. In the deviation correction device, the shoe is attached to the front end of the tube so that it can move forward and backward within a predetermined range and can swing, an inner tube is inserted between the tube and the auger, and the front end surface of the inner tube is is an inclined surface that is inclined with respect to the rear end surface of the shoe and is opposed to the rear end surface of the shoe, a first flange is provided on the front outer periphery of the inner tube, and the first flange is provided on the inner periphery of the tube. A second flange is provided behind the first flange, and a spring with an elastic force extending in the tube axis direction is interposed between the first and second flanges, and this spring and at least one flange are interposed between the first and second flanges. A thrust bearing is interposed between them, and the rear end of the inner tube is provided with a rotation means capable of rotating the inner tube in the circumferential direction and a tension means capable of compressing the spring. Deviation correction device for propulsion method. 2. A deviation correction device for a propulsion method in which a shoe is provided at the front end of a pipe to be buried underground, an auger is placed inside the pipe, and the auger removes dirt and stones while pushing the pipe forward, The shoe is attached to the front end of the tube so that it can move forward and backward within a predetermined range and swingable relative to the tube, an inner tube is inserted between the tube and the auger, and the front end surface of the inner tube is attached to the rear of the shoe. A first flange is provided on the front outer periphery of the inner tube, and a first flange is provided on the inner periphery of the inner tube rearward of the first flange. A second flange is provided between the first and second flanges, and a spring having an elastic force that extends in the axial direction of the tube is interposed, and between the spring and at least one of the flanges. A thrust bearing is interposed, a spherical bearing is interposed between the outer periphery of the shoe and the inner periphery of the tube, and the spherical bearing is movable in the axial direction by a predetermined distance with respect to the tube, so that the shoe can be moved at a predetermined distance with respect to the tube. The propulsion device is characterized in that the rear end of the inner tube is provided with rotation means capable of rotating the inner tube in the circumferential direction and tension means capable of compressing the spring. Construction method deviation correction device.