JP3120017B2 - Medium push structure of double steel pipe for propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-pushed steel pipe for a propulsion method for use in a method of propelling a buried steel pipe such as a gas pipe, a water pipe, and petroleum.

[0002]

2. Description of the Related Art When burying a pipe in the soil at a desired position, if it is impossible or undesirable to dig the above-ground portion at the desired position, it is necessary to cut the position from the separated position without digging it. A propulsion method of propelling and laying a pipe is used, and a double pipe is conventionally used in the method. The term “propulsion” refers to moving the soil forward in the longitudinal direction of the pipe. In such a conventional propulsion method, when the distance between the two positions is large and long-distance construction is to be performed, an intermediate pushing device is provided in the middle of the double pipe, and the original pushing thrust is divided and propelled by the intermediate pushing device. ing.

FIG. 4 is a longitudinal sectional view showing a conventional standard middle pressing device, and FIG. 5 is a modified transverse sectional view. Middle pressing device 1
Is composed of accessories such as a collar 2 for a middle-pushed pipe, a middle-pressed jack 3, a pad ring 4 and a walking plate 5, and a cushion material 6, a lubricant injection hole 7, and a rubber ring 8 for a middle-pushed pipe. Further, the middle pressing device 1 requires devices such as a hydraulic pump unit using a hydraulic jack and its accessories, a control panel, and an operation panel.

[0004] In such a conventional intermediate pushing device 1, the propulsive force of the intermediate pushing jack 3 is transmitted to the sheath tube via the front abutment wheel 4 and the collar 2 for the intermediate pushing tube, and the forward sheath tube is propelled. Next, the cylinder of the middle push jack 3 is contracted, and the sheath tube behind the middle push jack 3 is propelled by the main push jack in the starting shaft until the tip of the cylinder of the middle push jack 3 comes into contact with the front abutment wheel 4. As described above, the conventional middle pushing device 1 is used for the purpose of sharing a part of the total propulsion by the middle pushing jack 3, reducing the main pushing propulsion, and increasing the propulsion extension.

[0005]

However, since the intermediate pushing device is provided in the middle of the propulsion line, it is difficult to work with a small-diameter tube, and a sheath tube or an outer tube having a nominal diameter of 1000 mm or more is required. There was a point. In addition, since many medium-pressure jacks are used, many devices such as a hydraulic pump unit, control panel, operation panel, and hydraulic hose are required, and the space in the shaft must be widened.
The workability is also poor, and as a result, there has been a problem that the construction cost is expensive.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problem, to perform construction at low cost without using a hydraulic jack for a middle pushing device, and to apply the invention to long-distance propulsion even with a small-diameter pipe. It is an object of the present invention to provide a double-pushed double-pipe structure for a propulsion method.

[0007]

According to the present invention, there is provided a double-pushed steel pipe for a propulsion method in which a sheath pipe is an outer pipe and a main pipe is an inner pipe, wherein the sheath is disposed outside the main pipe. A rear mid-pipe having the same outer diameter as the pipe, a rear insertion pipe joined to a front end of the rear mid-pipe, having an outer diameter slightly smaller than the sheath pipe, and the rear insertion A front insertion tube having a rear portion fitted inside the front portion of the tube, having an outer diameter slightly smaller than the inner diameter of the rear insertion tube,
A front middle-pushed pipe slidably fitted to the outside of the rear insertion pipe and having the same outer diameter as the rear middle-pushed pipe;
A rear abutment ring provided at a front end of the front insertion tube,
The front abutment ring, which is provided on the inner side of the front middle push tube and is capable of abutting on the rear abutment tube, and is provided in front of the front insert tube, and the front middle push tube and the front insert tube. In the gap between
An annular earth and sand stopper rubber ring provided on the front end side of the rear insertion pipe, an annular water stopping rubber ring provided in a gap between the front middle push pipe and the front insertion pipe, and A stopper for preventing displacement of the water rubber ring in the pipe axis direction, and when the rear middle push tube is propelled forward, the rear abutment ring and the front abutment ring come into contact with each other to reduce the propulsive force to the front part. When transmitted to the middle push tube and the front middle push tube is propelled forward, the front abutment ring and the rear abutment ring separate, and the front middle push tube and the front insertion tube, between the rear insertion tube It is characterized in that it slides with.

[0008]

When the rear sheath tube is propelled to the rear sheath tube by the inside and outside propulsion device in the start shaft to propel the rear sheath tube on the start shaft side of the center pushing structure of the present invention, the rear abutment provided at the tip of the front insertion tube. Abuts on the front abutment ring provided at the rear end of the front middle push tube, the propulsion force is transmitted to the front middle push tube, the load is transmitted to the front front sheath tube in front of it, and the entire sheath tube is propelled. Can be. After the propulsion force of the sheath tube reaches a predetermined value, the propulsion force is then applied to the main tube to propel the main tube. Only the front middle push tube of the middle push structure slides forward, and during sliding, water is stopped by the waterproof rubber ring disposed between the front middle push tube and the front insertion tube. The earth and sand is prevented from entering by the earth and sand stopper rubber ring. Next, similarly, the sheath tube is again propelled by the inside / outside propulsion device, and the rear sheath tube is propelled to propel the front sheath tube through the intermediate pushing structure, and then the main tube is propelled. The construction is completed by repeating such work up to a predetermined propulsion length.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings.

First, a description will be given of an intermediate pushing structure of a double steel pipe for a propulsion method according to the present invention.

FIG. 1 is a cross-sectional view showing one embodiment of a double-pushed steel pipe for a propulsion method according to the present invention. FIG. 2 is a detailed view of one embodiment of a double-pushed steel pipe for a propulsion method according to the present invention. It is sectional drawing shown in FIG. As shown in the drawings, the present invention relates to a double-pushed double-pipe steel tube (hereinafter referred to as a “push-in structure”) provided in the middle of a double-pipe for a propulsion method using a sheath pipe 110 as an outer pipe and a main pipe 100 as an inner pipe. ").

[0012] The middle push structure of the present invention is a rear sheath tube 110.
a, which has the same outer diameter as the rear sheath tube 110a, and is slightly smaller than the rear sheath tube 110a, which is welded to the front end of the rear middle tube 11. Rear insertion tube 12a having an outer diameter of not shown, and rear insertion tube 1 fitted inside the front of rear insertion tube 12a.
A front insertion tube 12b having an outer diameter slightly smaller than the inner diameter of 2a and a front insertion tube slidably fitted to the outside of the rear insertion tube 12a and having the same outer diameter as the rear intermediately pushed tube 11 An inner rear pressing ring 13 provided at a front end of the front insertion tube 12b;
An annular front abutment ring 15 is provided forward of the inside of the front middle push tube 14 and can contact the rear abutment ring 13. The front abutment wheel 15 is reinforced by a reinforcing rib 16.

In the gap between the front middle push tube 14 and the front insertion tube 12b, an annular sediment stopping rubber ring 18 is disposed at the front end side of the rear insertion tube 12a.
At the front end of 8, a Σ-shaped waterproof rubber ring 19a is provided, and in the middle of the gap, an annular Σ-shaped waterproof rubber ring 19b is provided. 20 is the front insertion tube 12b
Rubber rings 19a, 19 provided on the outer peripheral surface of
This is an annular stopper for preventing the displacement of b.

The middle-pushed structure 10 thus constructed
Sets the distance between the rear sheath tube 110a welded to the rear end of the rear middle stamped tube 11 and the front sheath tube 110b welded to the front end of the front middle stamped tube 14 to the front middle stamped tube 14b.
It can be changed by sliding between the front insertion tube 12a and the rear insertion tube 12a. 17 is a front middle push tube 1
Reference numeral 4 denotes a sliding cover portion indicating a sliding range. Sealing of the gap between the front middle push tube 14 and the front insertion tube 12b is performed by rubber rings 18 and 19, whereby the sheath tube 1 is sealed.
Intrusion of water or earth and sand between the main pipe 10 and the main pipe 100 is prevented. In addition, the propulsive force given to the rear sheath tube 110a by the starting shaft can be transmitted to the front sheath tube 110b in front of the intermediate pushing structure 10 by the contact between the front abutment wheel 15 and the rear abutment wheel 13. .

Next, the propulsion process of the double steel pipe in the propulsion method implemented by applying the double-pushed structure of the double steel pipe for the propulsion method of the present invention will be described.

FIG. 3 is a perspective view showing an entire apparatus used for a propulsion method using a double-pushed structure of a double steel pipe for a propulsion method according to the present invention. As a propulsion method using the middle push structure of the present invention, Japanese Patent Application No. 4-236324 has been filed by the inventors. As shown in FIG. 3, the apparatus for the propulsion method according to the present embodiment is a piping smoother that is disposed forward (inside of the excavator) from an inside / outside propulsion device 54 provided in a rear starting shaft 55. 56, a double steel pipe 53, the present invention inner press structure 10, a double steel pipe 53, a double steel pipe push-in structure 52, a guide section 51 and an excavator (machine) 50. The inner / outer propulsion device 54 is a device capable of individually propelling an inner tube (main tube) and an outer tube (sheath tube).

First, the basic operation of the double steel pipe in this device is as follows. Excavator 50, guidance section 51,
The first double steel pipe behind the pushing structure 52 is propelled, and while excavating the ground, the double steel pipe is propelled in the direction of the excavator 50 in FIG. Leave the end behind the rear end of the sheath tube 110. Then, the following main pipe is propelled and welded to the rear end of the main pipe of the first double steel pipe. Next, the subsequent main pipe and sheath pipe are propelled by the inside / outside propulsion device 54. By repeating such welding and propulsion, propulsion is performed up to a predetermined propulsion length.

The propulsion construction according to the present invention in which the intermediate press structure 10 of the present invention is incorporated in a part of a double steel pipe is as follows. That is, when only the main pipe is propelled by the internal / external propulsion device 54 provided in the starting shaft 55 in a state in which the rear end of the main pipe of the double steel pipe is behind the rear end of the sheath pipe, By the action of the disposed pusher structure 52, the front sheath tube 110b (see FIG. 1) in front of the middle push structure 10 is pulled from the leading sheath tube, and the front middle push tube 14 and the front and rear insertion tubes 12b, 12a are pulled. Slides, and the overall length of the intermediate push structure 10 becomes longer. Next, when only the sheath tube is propelled by the inside / outside propulsion device 54, the portion from the rearmost sheath tube to the sheath tube on the starting shaft side (the rear sheath tube 110 a) of the middle pushing structure 10 is propelled, and the front middle pushing tube 14 and the front and rear are pushed forward. The insertion pipes 12b and 12a slide with each other, and the overall length of the intermediately pressed structure 10 becomes shorter, and the rear end of the main pipe of the rearmost double steel pipe remains behind the rear end of the sheath pipe. The following main is then propelled and welded to the rear end of the rearmost double steel pipe. The subsequent sheath is then propelled and welded to the rear end of the rearmost double steel sheath. In this manner, the propulsion force is alternately applied to the main pipe and the sheath pipe, and the welding of the main pipe and the welding of the sheath pipes of the subsequent double steel pipe are sequentially performed alternately, so that the predetermined propulsion length is obtained. Until the work of the propulsion method.

Next, the main pipe 1 having an outer diameter of 768 mm using the intermediate pressing structure of the present invention shown in FIG. 1 and FIG.
Using a double steel pipe for a propulsion method composed of the outer pipe 00 and a sheath tube 110 having an outer diameter of 914.4 mm outside the main pipe 100, the propulsion work was carried out by the apparatus of the propulsion method shown in FIG.

After the propulsion force of the sheath tube 110 reaches a predetermined value, in this embodiment, about 600 tons, the propulsion force is applied to the main tube 100 by the internal / external propulsion device 54 provided in the starting shaft 55, so that the main tube 100 is propelled. 100 propelled. Accordingly, the structure of the distal end portion of the double steel pipe 53 for propulsion causes the middle-pushed structure 10.
The front of the sheath tube 110b is propelled, and the sheath tubes 110b and 110
a is widened, and the front middle push tube 14 and the front / rear insertion tube 12
When the sliding cover 17 and the sliding cover 17 were opened up to the position of the earth and rubber stopper 18, the propulsion was stopped.
For example, the sliding amount was about 600 mm. At this time, while the front middle push tube 14 and the front and rear insertion tubes 12a, 12b slide and the front and rear sheath tubes 110a, 110b are separated, water is stopped by the two water stopping rubber rings 19a, 19b,
The earth and sand stopper rubber ring 18 prevented intrusion of earth and sand. Also, the front middle push tube 14 and the front and rear insert tubes 12a, 1a
The stopper 20 fixed the rubber ring 19 so that the water-stopping rubber ring 19 was not displaced during sliding of 2b.

Next, a propulsive force is again applied to the sheath tube 110 by the starting shaft 55 to propel the rear sheath tube 110a on the starting shaft side of the intermediate pushing structure 10 and the rear abutment wheel 13 and the front portion of the front end of the front insertion tube 12b. The propulsion force was transmitted to the front sheath tube 110b by contacting the front abutment ring 15 inside the middle push tube 14. After the contact, the main pipe 100 was propelled, and this operation was repeated up to a predetermined propulsion length, thereby completing the propulsion construction of the double steel pipe to a desired position.

[0022]

As described above, according to the present invention, the operation and effect similar to those of the conventional middle-push device using the middle-push jack can be obtained by incorporating the middle-push structure into a part of the double steel pipe for propulsion. Even if a small diameter pipe is used as a double steel pipe, long-distance construction can be easily performed.
Since no hydraulic equipment is required, the space in the shaft is not large and the workability is good, and as a result, the construction cost is low, and thus, there is an industrially useful effect.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an intermediately pressed structure of a double steel pipe for a propulsion method according to the present invention.

FIG. 2 is a cross-sectional view showing in detail one embodiment of a double-pushed structure of a double steel pipe for a propulsion method according to the present invention.

FIG. 3 is a perspective view showing an entire apparatus relating to a propulsion method using a double-pushed structure of a double steel pipe for a propulsion method according to the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional standard middle pressing device.

FIG. 5 is a modified cross-sectional view showing a conventional standard intermediate pressing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Middle press structure of the present invention 1 Middle press device 2 Middle press type pipe collar 3 Middle press jack 4 Abutment ring 5 Walking plate 6 Cushion material 7 Lubricant injection hole 8 Middle press type tube rubber ring 100 Main tube 110 Sheath tube 110a Rear sheath tube 110b Front sheath Pipe 11 Rear middle pressed pipe 12a Rear inserted pipe 12b Front inserted pipe 13 Rear back ring 14 Front middle pressed pipe 15 Front back ring 16 Reinforcement rib 17 Sliding cover part 18 Earth and sand stopper rubber ring 19, 19a, 19b Water stopping rubber Ring 20 Stopper 50 Excavator (machine) 51 Guidance section 52 Push-in structure 53 Double steel pipe 54 Internal and external propulsion device 55 Starting shaft 56 Piping smoother

Continuing on the front page (72) Inventor Noriyuki Ono 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Takashi Nakajima 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Satoshi Mukai 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Yasuhiro Matsuo 122-6 Shikutsu Koku, Atsugi-shi, Kanagawa Prefecture (72) Inventor Satoshi Furuya, Hiratsuka-shi, Kanagawa Prefecture 391-3 Toyoda 201 Happy Chateau 201 (72) Inventor Teruyuki Matsumoto 88, Ono-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Within Nihon Kokan Co., Ltd. (72) Inventor Masayuki Matsumoto 1-2-1, Marunouchi East, Chiyoda-ku, Tokyo East Keikai Building New Building 5th Floor Nihon Victoria Co., Ltd. (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 9/06 311

Claims (1)

(57) [Claims] In a double-push structure for a double-walled steel pipe for a propulsion method, wherein a sheath pipe is an outer pipe and a main pipe is an inner pipe, an outer diameter of the same dimension as the sheath pipe, which is arranged outside the main pipe, is provided. A rear insertion tube having an outer diameter slightly smaller than the sheath tube, which is joined to a front end of the rear insertion tube; and a rear portion inside a front portion of the rear insertion tube. The front insertion tube, which has an outer diameter slightly smaller than the inner diameter of the rear insertion tube, fitted with the rear insertion tube, and the rear intermediately pushed tube slidably fitted outside the rear insertion tube. A front middle pressed tube having an outer diameter of the same size; a rear abutment provided at a front end of the front insertion tube; and a front centered tube provided forward of the front insertion tube and provided inside the front middle pressed tube. A front abutment ring that can be brought into contact with the rear abutment ring, the front middle push tube, and the front insertion tube An annular sediment-stopping rubber ring provided on the front end side of the rear insertion pipe in the gap of the above, and an annular water stopping rubber ring provided in a gap between the front middle pushing pipe and the front insertion pipe. And a stopper for preventing displacement of the water-stopping rubber ring in the pipe axis direction. When the rear middle push tube is propelled forward, the rear abutment abuts against the front abutment, and a propulsive force is applied. Is transmitted to the front mid-push tube, and when the front mid-push tube is propelled forward, the front abutment ring and the rear abutment ring are separated, and the front mid-push tube, the front insertion tube, and the rear insertion A double-pushed double-pipe structure for propulsion, characterized by sliding between the pipe and the pipe.