JP3340678B2 - Special middle pressing device for curves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion method in which a propulsion force for propelling and embedding an excavator and a propulsion tube row is distributed to an intermediate portion of the propulsion pipe row without being concentrated at the rearmost end of the propulsion pipe row. More particularly, the present invention relates to a curving middle press device that can smoothly pass through a curved section in a curve propulsion method.

[0002]

2. Description of the Related Art The propulsion method is a method in which a propulsion pipe is advanced into the ground while excavating a face with a tip excavator. The propulsive force for advancing the excavator and the propulsion pipe is generated in a starting shaft. The pressurization of the original push jack is applied to the rear end face of the propulsion pipe. The propulsion force is the frictional resistance between the outer periphery of the propulsion pipe and the surrounding ground, and increases in proportion to the propulsion distance. For this reason, as the propulsion extension becomes longer, the propulsion force gradually increases, and a force exceeding the axial load-bearing capacity of the propulsion pipe acts. An intermediate pushing device is used to disperse the propulsion force and reduce the propulsion force applied to the rearmost end of the propulsion pipe.

[0003] As shown in Fig. 5, the structure of the intermediate pushing device is as follows. The first stepped portion of the first propulsion pipe S which is extended is fitted. A plurality of middle pressing jacks are equally arranged in the circumferential direction on the inner periphery of the ring, and are fixed to the inner wall of the ring by metal fittings. Further, a second step has a long stepped portion having a small diameter at the tip end, and a collar having a small stepped portion of the next standard propulsion pipe fitted thereinto at the rear.
The propulsion pipe T is configured to be inserted into the ring body and abut on the rear end of the center pushing jack via a ring-shaped abutment. Regarding the expansion and contraction length of the middle push jack, the longer the stroke length is, the longer the push-in distance in one stroke is and the better the propulsion efficiency is, but the longer the stroke of the jack is, the longer the stroke of the first propulsion pipe S becomes. The length of the ring body needs to include the height of the jack, the stroke, and the overlap with the second propulsion pipe T, so that the length is extremely long, and the length of the entire intermediate pressing device is also long. There's a problem.

[0004]

The propulsion force for burying the excavator and the propulsion pipe can be dispersed by the pegs provided in the middle of the propulsion pipe row by the propulsion construction method described above. The propulsion force applied to the rear end of the propulsion pipe row requires only a relatively small propulsion force, which enables long extension propulsion construction. In recent years, in addition to prolonged propulsion construction, propulsion plans including curve propulsion have been increasingly adopted. For this reason, in curve propulsion, in order to make the overall length of the intermediate pressing device as small as possible, a jack having a reduced stroke length of the intermediate pressing jack is used, and a method of facilitating curve formation has been adopted. However, in the case of prolonged propulsion construction including sharp curve propulsion, in order for the central push device to form the planned curve in the curved section, the bend angle is required even in the cushion material part inserted between the rear of the central push jack and the wheel. However, since the gap between the ring of the first propulsion pipe S, which is extended long behind, and the stepped portion of the second propulsion pipe T is small, the state immediately comes into close contact, and it is difficult to form a planned curve. Problem.

[0005] Therefore, the present invention provides a center pushing device capable of easily forming a curve along a planned curve even in a sharp curve propulsion construction.

[0006]

That is, the present invention relates to an intermediate pushing device for dispersing a propulsive force which acts on the rearmost end face of a propulsion pipe by a propulsion method, and has a step portion having a small diameter at a front end portion. Then, insert the stepped part of the outer cylinder, which is made by extending the long cylindrical front ring body to the rear, into the collar of the standard propulsion pipe in front,
An inner cylinder made of a cylindrical intermediate ring having a ring-shaped flange at both front and rear ends is installed so as to be inscribed in the outer cylinder, and the inner cylinder is equipped with a plurality of middle push jacks, and a ring is provided in front of the inner cylinder. The flange of the joint cylinder consisting of a cylindrical cylinder having a cylindrical flange is fixed to the rear flange of the inner cylinder, and the front rear end has a stepped portion with a small diameter and the cylindrical rear ring is extended rearward. The stepped part of the rear cylinder made by contacting the flange of the joint cylinder via the thrust transmitting material allows the joint cylinder part to bend even in the curved section and the inner cylinder can be recovered after completion of propulsion construction This is a special middle pressing device for curves.

The outer diameter of the step provided at the front end of the outer cylinder is made slightly smaller than the inner diameter of the collar fixed to the rear end of the standard propulsion pipe in front, and is fitted into the collar. . The length of the cylindrical front ring extending rearward is determined based on the length of the inner cylinder and the length of the step portion of the rear cylinder at the time of collecting the inner cylinder after completion of propulsion.

The inner cylinder is manufactured to be slightly smaller than the inner diameter of the annular body of the outer cylinder, and has a size that can be installed in the outer cylinder. In the tubular intermediate ring, it is long enough to store the middle push jack,
They are evenly arranged in the circumferential direction. The rear end of the middle push jack is
The head of the center push jack is cut out so that the head part of the center push jack does not touch the front flange, and the jack head directly hits the wall surface. The inner cylinder has a structure that can be divided at a plurality of locations, and can be collected by removing the tie bolt after completion of propulsion.

The fixing of the rear flange of the inner cylinder and the flange of the joint cylinder is firmly fastened by flathead bolts or the like. The length of the joint tube is approximately the same as the length of the collar of a normal standard propulsion pipe, and has a structure that can be easily bent at the joint portion.

The step portion of the rear cylinder is manufactured to be slightly smaller than the inner diameter of the cylinder of the joint portion, is inserted into the joint cylinder, and comes into contact with the flange of the joint cylinder via a thrust transmitting member. The length of the rear annulus of the rear cylinder needs to be large enough to insert the step portion of the standard propulsion pipe connected to the rear, and it is manufactured to be approximately the same length as the collar of the propulsion pipe.

In the special middle press device for curves according to the present invention, the middle press jack is not installed in the front outer cylinder, but is installed in the inner cylinder provided in the outer cylinder, so that the front annular body of the outer cylinder can be formed as compared with the conventional one. Since the length is shortened and the structure is bendable at the joint tube at the rear of the inner tube, a bend angle is formed at the intermediate portion of the intermediate pushing device, and accurate curve propulsion can be buried even when propelling a sharp curve. After completion of the propulsion, the inner cylinder can be collected and reused, and the length of the entire intermediate pressing device can be reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view for explaining the entire curve special intermediate pressing device of the present invention. In the collar 21 fixed to the rear end of the standard propulsion pipe 22, the stepped portion 3 of the outer cylinder 2 having the stepped portion 3 having a small diameter at the front end and extending the long cylindrical front ring 4 at the rear is provided. insert. In the outer cylinder 2, there is a ring 4
An inner cylinder 5 provided with flanges 6 and 7 at both front and rear ends of an intermediate ring body 8 having a diameter slightly smaller than the inner diameter of the inner ring 5 is installed. Inner cylinder 5
A plurality of middle push jacks 9 are supported by a fixing bracket 10 so as to abut against the rear flange 7 on the inner periphery. Flange 7 at the rear of inner cylinder 5 and ring-shaped flange 1 at the front
The flange 12 of the joint tube 11 composed of the cylindrical tube body 13 having two is tightly fixed by a countersunk bolt or the like (not shown). A step portion 15 of a rear tube 14 having a step portion 15 having a small diameter at a front end portion and extending a tubular rear ring body 16 at the rear is inserted into the tube body 13 of the joint tube 11, and a thrust force is obtained. The transmission member 17 is in contact with the flange 12 of the joint tube 11. The step portion of the standard propulsion pipe 22 is inserted into and connected to the rear annular body 16 of the rear cylinder 14.

The length of the intermediate ring 8 of the inner cylinder 5 is changed by the length of the middle push jack 9 to be equipped.
Is slightly longer than the length of the middle push jack 9 so that no propulsive force acts on the middle push jack 9 during normal propulsion.
At the time of passing through the curved section of the special intermediate pressing device 1 for a curved line, a bend angle can be formed at the tip of the outer cylinder 2, the cylindrical body 13 of the joint cylinder 11 and the rear annular body 16 of the rear cylinder 14, and the curve follows the planned curve. Curve formation.

In the gap between the outer cylinder 2 and the inner cylinder 5, the outer cylinder 2 and the joint cylinder 11, and between the joint cylinder 11 and the rear cylinder 14, a water-stopping material for preventing intrusion of groundwater or the like from outside is installed. Water stopping material 18
As the rubber material, a commonly used rubber material is used.

FIG. 2 is a front view for explaining the inner cylinder of the special middle press device for curves. The inner cylinder 5 is divided into a plurality of portions so that it can be collected. When used, the inner cylinder 5 is used integrally by tightening the joint flange 20 with a bolt 19 or the like. Intermediate ring 8
A flange 6 provided at the front end of the inner press jack 9 has a structure in which the middle press jack 9 is cut off so that the head of the middle press jack 9 contacts the wall surface of the outer cylinder 2.

FIG. 3 is a longitudinal sectional view for explaining the operating state of the special intermediate pressing device for curves according to the present invention. The extension of the middle push jack 9 causes the head of the middle push jack 9 to extend forward, and the inner cylinder 5
Then, the wall of the outer cylinder 2 is pressed through the notch of the flange 6 to push the outer cylinder 2 forward. When the extension of the middle push jack 9 is completed, the jack 9 is reduced and stored in the inner cylinder 5,
The propulsive force from the rear middle or primary pushing device is the rear cylinder 1
The flange 6 at the front end of the inner cylinder 5 comes into contact with the wall surface of the outer cylinder 2 while being transmitted to the inner cylinder 5 via the joint pipe 4 and the joint cylinder 11.

FIG. 4 is a longitudinal sectional view for explaining the special middle press device for curves after completion of propulsion. After the propulsion is completed, the middle push jack 9 is removed, and then the inner cylinder 2 is divided and collected. When the collection of the inner cylinder is completed, the propulsion force is transmitted from the rear standard propulsion pipe 22, and the rear cylinder 14 and the joint cylinder 11 are pushed forward, and the flange 12 of the joint cylinder 11 is brought into contact with the wall surface of the outer cylinder 2. Complete the storage.

As described above, according to the special middle press device for curves of the present invention, even if the stroke of the middle press jack is increased, the length of the intermediate ring 8 of the inner cylinder only increases by the height of the jack. It is not necessary to make the front ring of the outer cylinder very long as in the conventional case, and the overall length of the device can be shortened. It is. In addition, by providing the joint cylinder behind the inner cylinder, a bend angle can be formed at an intermediate portion of the intermediate pressing device, and an accurate curve can be easily formed even in a sharply curved propulsion construction.

[0018]

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view for explaining an entire curve special intermediate pressing device of the present invention.

FIG. 2 is a front view for explaining an inner cylinder of the special middle pressing device for curves.

FIG. 3 is a vertical cross-sectional view for explaining the operating state of the special middle press device for curves according to the present invention.

FIG. 4 is a vertical cross-sectional view illustrating a special middle press device for curves after completion of propulsion.

FIG. 5 is a longitudinal sectional view illustrating a middle pressing device according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Special middle press apparatus for curves 2 Outer cylinder 3 Step part of outer cylinder 4 Front ring 5 Inner cylinder 6 Front flange 7 Rear flange 8 Intermediate ring 9 Middle push jack 10 Fixture 11 Joint cylinder 12 Flange 13 Tube 14 Rear Tube 15 Stepped portion of rear tube 16 Rear ring 17 Thrust transmitting material 18 Waterproof material 19 Bolt 20 Joint flange 21 Collar 22 Standard propulsion tube 23 First propulsion tube S 24 Second propulsion tube T 25 Ring of first propulsion tube S body

Claims (1)

(57) [Claims] An intermediate pusher for dispersing a propulsive force acting concentrated on a rearmost end face of a propulsion pipe by a propulsion method, comprising a cylindrical front ring having a small step portion at a front end portion and a long rear portion. The stepped portion of the outer cylinder formed by extending the body is inserted into the collar of the standard propulsion pipe in the front, and the inner cylinder formed of a cylindrical intermediate ring having ring-shaped flanges at both front and rear ends is inserted into the outer cylinder. The inner cylinder is equipped with a plurality of middle push jacks, and the flange of a joint cylinder consisting of a cylindrical cylinder having a ring-shaped flange at the front is fixed to the rear flange of the inner cylinder. The front end has a stepped portion with a small diameter, and the rear end of the rear tube formed by extending the cylindrical rear ring body at the rear is in contact with the flange of the joint tube via a thrust transmitting material, and is curved. Bending is possible in the section and in the joint tube, and the inner tube can be collected after completion of propulsion work Curve for special Chu押 apparatus, characterized in that the