JP2719265B2 - Grout method of double steel pipe for propulsion - 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 steel pipe for propulsion in a propulsion method in which a double steel pipe having a double pipe structure, such as a gas pipe, is propelled into the soil to be buried in the soil. Grouting method for filling the connecting portion of the grout.

[0002]

2. Description of the Related Art For example, a double steel pipe in which concrete or the like is poured between an inner pipe and an outer pipe is used as a pipe buried in the soil to send high-pressure gas, in order to maintain the strength of the pipe. May be used. Also, when burying this double steel pipe in the soil, instead of digging and burying a long and narrow groove along the path to be buried from the ground, digging a predetermined shaft, A so-called propulsion method of burying a double steel pipe by propelling it in the longitudinal direction may be adopted.

FIG. 5 is a side view (a) and a sectional view (b) showing an example of a conventional double steel pipe for propulsion used when adopting the above-mentioned propulsion method. This double steel pipe 31
Has, as its basic structure, an inner pipe 33 and an outer pipe 35, and a concrete 37 filling the space between the inner pipe 33 and the outer pipe 35.
Consists of Here, the front end 33a and the rear end 33b of the inner pipe 33 are not covered with the concrete 37 and are exposed.

[0004] A number of such double steel pipes 31 are prepared,
Propulsion into the ground in the direction indicated by the arrow in the figure,
The rear end face 33d of the double steel pipe 31 already propelled and the front end face 33c of the new double steel pipe 31 are brought into contact with each other and welded. To the rear end face 35b of the outer pipe 35 of the double steel pipe 31 already propelled and the outer pipe 5 of the new double steel pipe 31.
Of the inner pipe 33 of the new double steel pipe 31 and the rear end face 35 of the outer pipe 35.
A thrust is applied to b to propel it in the direction of the arrow. By repeating this many times, the double steel pipes 31 connected to each other are buried in the soil.

[0005]

Here, in the propulsion method using the above-mentioned double steel pipe 31, the inner pipe 33 and the outer pipe 35 (or ring-like fitting) of the connecting portion of the double steel pipe 31 are connected. Is preferably filled with cement milk or the like from the viewpoint of strength, but there is a problem that it is difficult to completely fill without gaps. Also, without filling, the steel segment is fitted into the circumference. , Sometimes promote.
However, in this case, the strength of the connecting portion becomes a problem.

When the conventional double steel pipe as described above is used, for example, the rear end face 33d of the inner pipe 33 is bent or scratched by the propulsion, and before being welded to the next inner pipe of the double steel pipe. Thereafter, a step of shaping the end face 33d was required.
Further, the propulsion causes internal stress in the inner pipe 33, and for example, a pinhole or a crack may be generated in the inner pipe 33 while it is buried and used in the soil.

In view of the above circumstances, the present invention employs a propulsion method that does not require a step of shaping the rear end face of the inner pipe and does not cause internal stress in the inner pipe, and then employs a propulsion method used in the propulsion method. It is an object of the present invention to provide a method for grouting a double steel pipe.

[0008]

To achieve the above object, the present invention provides a method for grouting a double steel pipe for propulsion, comprising the steps of:
An intermediate member that covers the outer periphery of the inner tube so that both ends of the inner tube are exposed, a grout hose insertion hole extending in the longitudinal direction provided in the intermediate member, and an outer member that slides between the intermediate member. A double steel pipe for propulsion provided with a pipe is used.

The method for grouting a double steel pipe for propulsion according to the present invention.
Is to fill the connecting part of the above double steel pipe for propulsion.
(1) the propulsion in which the already propelled rear end protrudes into the shaft.
New propulsion double on the rear end face of the inner pipe of
The front end faces of the inner pipes of the steel pipes are brought into contact with each other to
(2) The grou of the already propelled double steel pipe for propulsion
Grout hoe exposed from the opening at the rear end of the hose insertion hole
The rear end of the steel and the grout
Of the grout hose exposed from the opening at the front end of the
Second step of connecting to the front end (3) The outer tube of the new double steel tube for propulsion is connected to the intermediate
Sliding forward against the material, the front end of the outer tube has already been propelled
Abutting the rear end face of the outer pipe of the double steel pipe for propulsion
Third step (4) Applying thrust to the outer pipe of the new double steel pipe for propulsion
The fourth step of propelling the double steel pipe for propulsion  (5) The first step before the plurality of double steel pipes for propulsion
The second step, the third step, and the fourth step are repeated.
After doingPull out grout hoses sequentially connected
WhilePour the filler into the grout hose,The gra
Position the end of the out hose at the joint of the double steel pipe for propulsion.
Let'sBy the filler,Double steel pipe for propulsionConnecting part
Inner tubeAnd outsideFifth step of filling the space between pipesConsists ofSpecially
It is a sign.

[0010] Further, over a plurality of double steel pipes for propulsion,
The first step, the second step, the third step, and the fourth step
At one point in the middle of repeating the process, after the first process,
The step of executing the third step by omitting the second step is provided.
The fifth stepOf the double steel pipe for propulsion
The double steel pipe for propulsion located at the forefront of the
AfterConnect the grout hose to the front and rear
Withdraw fromProcessIs also good.

[0011]

The double steel pipe for propulsion used in the present invention has a structure in which the intermediate material slides between the outer pipe and the inner pipe by applying a thrust only to the outer pipe. The double-pipe steel pipe for propulsion can be buried in the soil by using the propulsion method without causing any damage and without causing internal stress in the inner pipe. Holes and cracks are prevented from being generated, and highly reliable construction can be performed.

In the method for grouting a double steel pipe for propulsion according to the present invention, the grout hoses are connected to each other when the double steel pipes for propulsion are connected to each other, and after the propulsion, cement milk is added to the grout hose. The joint portion of the double steel pipe for propulsion is filled by pouring a filler such as the above, so that the joint portion can be completely filled, and a buried pipe having sufficient strength can be obtained.

At this time, if one end of the outer pipe is provided with a check valve which opens only from the inside to the outside of the outer pipe, water or earth and sand may be interposed between the inner pipe and the outer pipe during propulsion. Even if water has entered, the water, earth and sand, etc. will be unilaterally pushed out of the outer tube due to the filling pressure when the filler is filled, and the filler will be removed from the inner tube and the outer tube. Will be spread enough in the space between the two. Further, the filler itself flows out of the outer pipe through the check valve, so that the surplus space near the outer wall of the outer pipe is filled with the filler, and the buried pipe becomes stronger.

Here, the above grout hose generally fills the connecting portion while sequentially withdrawing, but when the propulsion span is long, the grout hose may be withdrawn in the forward direction of the propulsion direction, and may be withdrawn in the rear direction. Although it is good, do not connect the grout hoses at only one point near the center, and after the propulsion double steel pipe reaches the reaching pit , pull out the grout hose both forward and backward in the propulsion direction In this case, the filling operation can be performed in parallel, which is preferable.

[0015]

Embodiments of the present invention will be described below. 1 is a side view along a longitudinal direction of a double steel pipe for propulsion according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of the double steel pipe for propulsion shown in FIG. 3 is an enlarged side view of a portion indicated by a circle A in FIG. Here, a double steel pipe for gas propulsion will be described as an example.

FIG. 1 and FIG. 3 show a double steel pipe for propulsion 1 'and a double steel pipe for propulsion 1' in a state where it has already been propelled into the soil and only a part of the rear end projects into the shaft. A new double steel pipe 1 for propulsion connected to the rear end and propelled into the soil together with the double steel pipe 1 'for propulsion is shown. These double steel pipes 1 and 1 'for propulsion have the same structure.

The double steel pipe 1 for propulsion has an inner pipe 2 of about 900 mmφ made of steel pipe and an inner pipe 2 of about 12 mm also made of steel pipe.
It comprises an outer pipe 3 having a diameter of 00 mm and concrete 4 as an intermediate material for filling between the inner pipe 2 and the outer pipe 3. Here, as shown in FIG. 2, an embi tube 5 forming a grout hose insertion hole according to the present invention is embedded in the concrete 4, and a grout hose 6 is inserted through the embi tube 5.

As shown in FIG. 3, a check valve 9 near the front end of the outer tube 3 in the propulsion direction is opened when pushed from inside the tube and closed when pushed from outside the tube.
Is provided. Further, a polypropylene pipe 7 is provided on the outer periphery of the concrete 4, and a lubricant is applied between an inner wall of the outer pipe 3 and an outer wall of the polypropylene pipe 7. Thereby, when the outer tube 3 is pushed in the longitudinal direction, the outer tube 3 slides against the concrete 4. The front gas Idoringu 10 in the outer tube 3 is provided with a stop ring 11 on the inner wall of the rear portion, the forward propulsion Double Tube 1 as described later is slid over the concrete 4 When the vehicle advances, the guide ring 10 enters the inside of the outer pipe 3 ′ of the double steel pipe 1 ′ for propulsion from the rear end face 3 c ′ side, and the tip thereof contacts the stop ring 11. Also, the front end face 3b of the outer pipe 3 of the double steel pipe 1 for propulsion.
And the rear end face 3c 'of the outer pipe 3' of the double steel pipe 1 'for propulsion abuts. Since the guide ring 10 is provided in this manner, even if there is a slight displacement between the outer tubes 3 and 3 ', the error is absorbed, and the outer tubes 3 and 3' abut accurately.

The outer surface 2a of the inner tube 2 is coated with polyethylene. As shown in FIGS. 1 and 3, after the front end face 2b of the inner pipe 2 of the double steel pipe 1 for propulsion and the rear end face 2c 'of the inner pipe 2' of the double steel pipe 1 'for propulsion come into contact with each other, this contact is made. The inner pipe at the contact is welded. After this welding, the welded portion is newly covered with a polyethylene tube from the outer surface. FIG.
FIG. 4 is a schematic view showing a propulsion method for burying a double steel pipe for propulsion having the structure shown in FIGS.

As shown in FIG. 4 (a), it is assumed that the double steel pipe for propulsion 1 'has already been propelled into the soil by the propulsion method and a part of the rear end thereof has protruded into the shaft. For the double steel pipe for propulsion 1 'whose part of this rear end protrudes into the shaft,
A new double steel pipe 1 for propulsion is prepared, and the front end face 2b of the inner pipe 2 and the rear end face 2 'of the double steel pipe 1' for propulsion have already been propelled.
The double steel pipe 1 for propulsion is arranged so that c ′ comes into contact with the pipe (see FIGS. 1 and 3).

Next, as shown in FIG. 4 (b), the rear end face 2c 'of the propulsion double steel pipe 1' and the front end face 2b of the propulsion double steel pipe 1 which are in contact with each other are welded. The later condition is inspected using X-rays, and if this inspection is passed, the weld is covered with a polyethylene tube 20. As described above, the portion of the outer wall 2a of the inner pipe 2 that is hidden by the concrete 4 is also coated with polyethylene.

Next, as shown in FIG. 4 (c), the grout hose 6 is inserted into the grout hose insertion tube 5 shown in FIG. 2 of the propulsion double steel tube 1, 1 '. Connected. However, in the case of long distances, here, a large number of cables will be connected and propelled, so that one point that will eventually be located near the center will be connected to the grout hose in the propulsion direction forward (the arrival pit side) . Leave unconnected so that it can be pulled out half-by-half from the rear (starting pit side) .

Thereafter, the outer pipe 3 is slid forward with respect to the concrete 4 from the state shown in FIG. 4 (c) to the state shown in FIG. 4 (d), whereby the front end face 3b of the outer pipe 3 is moved. Abuts on the rear end face 3c 'of the outer tube 3'. afterwards,
As shown in FIG. 4 (e), at the rear end of the double steel pipe 1 for propulsion,
A pressing wheel 21 is provided so as to contact only the rear end face 3c of the outer tube 3.
The propulsion hydraulic jack 22 is set so as to press the pressing wheel 21, and a thrust is applied to the outer pipe 3 to transform the propulsion double steel pipe 1 into the propulsion double steel pipe 1 ′ and the propulsion double steel pipe 1 ′. It is propelled into the soil together with the same type of double steel pipe for propulsion connected further forward than 1 '. Here, a not-shown excavation head is attached to the front end of the foremost double steel pipe for propulsion, whereby the propulsion is performed while digging.

After the propulsion through the above-described steps is performed over a large number of propulsion double steel pipes, the grout hose 6
A mortar is poured into the connection portion (see FIG. 2), and the grout hose is pulled out, for example, so as to be sequentially arranged at the connection portion of the double steel pipe for propulsion, while being drawn between the inner tube 2 and the outer tube 3 of the connection portion. Fill. In this case, when the grout hose 6 is pulled backward in the propulsion direction, the cement milk does not flow out from the opening at the front end of the grout hose insertion tube 5 of the double steel tube for propulsion arranged at the front end in the propulsion direction. Preferably, the opening is closed. When the grout hose 6 is pulled out, it is preferable to pull out the grout hose 6 while pouring the cement milk into the grout hose 6 so that the inside of the grout hose insertion tube 5 is also filled with the cement milk. When the space between the inner pipe 2 and the outer pipe 3 of the connecting portion is filled with the cement milk, the cement milk removes water, earth and sand, etc., which have entered between the inner pipe 2 and the outer pipe 3.
4 and the cement milk itself also flows out through this check valve and flows out of the outer pipe 3 as shown in FIG.
As shown in (f), the outer wall of the outer tube 3 is also covered with cement milk. This makes the buried pipe more robust. Further, the settlement of the ground surface can be prevented.

As an example, a gas having a gas pressure of 70 kg / cm ² is passed through the inner pipe of the double steel pipe buried in the soil. Here, the double steel pipe for gas propulsion and its propulsion method have been described, but it goes without saying that the present invention is not limited to the gas type.

[0026]

As described above, according to the method for grouting a double steel pipe for propulsion of the present invention, a grout hose insertion hole is provided in the double steel pipe for propulsion, and a grout hose is provided therein. The grout hose was connected when the steel pipes were connected, and the filler was poured into the connected grout hose after propulsion to fill the connected portion of the propulsion double steel pipe and the like. The connection part can be completely filled, and becomes a strong buried pipe.

[Brief description of the drawings]

FIG. 1 is a side view along a longitudinal direction of a double steel pipe for propulsion according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the double steel pipe for propulsion shown in FIG. 1 as viewed from the right side in FIG.

FIG. 3 is an enlarged side view of a portion indicated by a circle A in FIG. 1;

FIG. 4 is a schematic diagram showing a propulsion method for burying a double steel pipe for propulsion having the structure shown in FIGS.

FIG. 5 is a side view (a) and a cross-sectional view (b) showing an example of a conventional double steel pipe for propulsion used when adopting the propulsion method.

[Explanation of symbols]

1, 1 'double steel pipe for propulsion 2 inner pipe 3 outer pipe 4 concrete 5 embi pipe 7 polypropylene pipe 9 check valve 10 guide ring 11 stop ring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akitaka Fujita 1-7-7 Suehirocho, Tsurumi-ku, Yokohama-shi Inside the Tokyo Gas Co., Ltd. Pipe Technology Center (72) Inventor Shingo Nagashima 1 Suehirocho, Tsurumi-ku, Yokohama-shi 7-7-7 Tokyo Gas Co., Ltd. Conduit Technology Center (72) Inventor Akira Adachi 3-17-18 Matsunami, Chiba City (72) Inventor Tomoya Fujimoto 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel (72) Inventor Shigeru Morishita 2-2-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation

Claims (2)

(57) [Claims] 1. An inner tube, an intermediate material covering the outer periphery of the inner tube so that both ends of the inner tube are exposed, a grout hose insertion hole extending in a longitudinal direction provided in the intermediate material, and A grouting method for a propulsion double steel pipe that fills a connection part of a propulsion double steel pipe with an outer pipe that slides between the propulsion material and a rear end that has already been propelled to a shaft. A first step in which the front end face of the new inner pipe of the double steel pipe for propulsion is brought into contact with the rear end face of the inner pipe of the double steel pipe for protruding to connect these inner pipes together; From the rear end of the grout hose exposed from the rear end opening of the grout hose insertion hole of the already propelled double steel pipe and from the front end opening of the grout hose insertion hole of the new double steel pipe for propulsion. A second step of connecting the exposed front end of the grout hose to the new propulsion hose; A third step of sliding the outer pipe of the heavy steel pipe forward with respect to the intermediate material to bring the front end face of the outer pipe into contact with the rear end face of the outer pipe of the already propelled double steel pipe; A fourth step of applying a thrust to the outer pipe of the new double steel pipe for propulsion to propel the double steel pipe for propulsion, and the first step over a plurality of double steel pipes for propulsion, Second
After repeating the steps, the third step, and the fourth step , sequentially pull out the grout hoses sequentially connected.
By pouring filler Luo the grout hose, the grout
Position the end of the hose at the connection of the double steel pipe for propulsion.
It is by the filling material, the inner tube coupling portion of the propulsion Double Tube
Grout method of propulsion Double Tube characterized by comprising a fifth step of filling the space between the outer tube and. 2. The method according to claim 1 , wherein the first steel pipe extends over a plurality of double steel pipes for propulsion.
Step, the second step, the third step, and the fourth step
Is repeated at one point during the repetition,
The step of executing the third step is omitted by omitting two steps, and the fifth step is performed in the sequentially connected double steel pipes for propulsion.
Double steel pipe for propulsion, which is located at the forefront of Japan, has reached the reaching pit
After that, the grout hose is moved in both the forward and backward directions in the propulsion direction.
2. The method for grouting a double steel pipe for propulsion according to claim 1, wherein the step is a step of extracting the double steel pipe from a propulsion pipe.