JPH08151894A - Steel pipe for propulsion burial and propulsion burial construction method for steel pipe - Google Patents

Abstract

PURPOSE: To improve the efficiency of the connecting work by fixing a short pipe (joint member) protruded from an end face to the outer face or the inner face of one end section of a buried steel pipe by the jacking method, and merely inserting the next buried pipe into the short pipe for positioning. CONSTITUTION: A short outer pipe 3 protruded from an end face 2a is fixed by welding to one end section of a steel pipe 1 of a service water pipe or a gas pipe buried by the jacking method. This steel pipe 1 is propelled and buried by a propelling jack provided in a starting vertical shaft, the next buried pipe 1 is connected and propelled after the steel pipe 1 is propelled by the prescribed distance, these actions are subsequently repeated in sequence, and the steel pipe 1 is propelled to the arrival shaft. When the succeeding pipe 1 is to be connected, the succeeding pipe 1 is inserted into the outer pipe 3, its end face 2 is brought into contact with the end face 2a of the preceding pipe 1, then the axes of both pipes 1 coincide for positioning. The infiltration of sediment is prevented, and the connection section is prevented from being separated by the soil pressure. The burying work can be quickly conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe that is propelled and buried in the ground and a method for propelling and embedding the steel pipe in the ground.

[0002]

2. Description of the Related Art Propelled steel pipes are used as water pipes, gas pipes, pipes for underground burying of electric wires, and the like. Therefore, it is necessary to connect multiple steel pipes one after another over a long distance and promote them. Further, as another method of use, it is known to be used in a construction method called a pipe roof construction method as a construction method for constructing a cavity such as a sidewalk or a road in the ground. In this method, a large number of steel pipes are propulsively embedded from the starting shaft to the reaching shaft so as to show a rectangular contour, the earth and sand inside the contour are excavated by an excavator, and the inner wall of the excavated portion is lined with concrete or the like. It is a method of lining with wood.

In the above-mentioned construction method, the distance from the starting vertical shaft to the reaching vertical shaft, that is, the steel pipe propulsion burying distance is significantly longer than the width of the starting vertical shaft in the propulsion direction, the steel pipe is propulsively buried in the propulsion cylinder, and the propulsion slot of the propulsion cylinder. Since it is short, one long steel pipe from the starting shaft to the reaching shaft cannot be thrust and buried, and short steel pipes are sequentially thrust and buried.

On the other hand, since the steel pipe to be propulsively embedded is manufactured by drawing or the like, the steel pipe is a tubular body having the same sectional shape over the entire length in the longitudinal direction.

[0005]

As described above, in order to successively propel and embed a plurality of steel pipes in the soil, the steel pipe to be next propelled and buried concentrically at the rear end portion of the steel pipe to which propulsion was buried first. It is necessary to position them in a fixed shape and connect them, and it is necessary to prevent a plurality of steel pipes buried in the soil from being separated by earth pressure or the like, and to prevent dirt and sand from entering from the joint portion.

For this reason, conventionally, the front end face of the steel pipe to be next propulsion embedded is brought into contact with the rear end face of the steel pipe to be propulsion embedded first, and connected by welding. That is, since the steel pipe is a tubular body having the same cross-sectional shape over the entire length in the longitudinal direction, the rear end face and the front end face are butted and welded in order to concentrically position and connect.

Therefore, in the conventional steel pipe propulsion burying method, when a steel pipe is propelled and buried to some extent from the starting shaft by the propulsion jack, the front end face of the next steel pipe is abutted against the rear end face of the steel pipe, In the above, the steel pipes are welded and connected to each other, and then the next steel pipe is pushed by the propulsion jack to be propulsively embedded.

Therefore, when welding the steel pipes together, the propulsion burying operation by the propulsion jack is interrupted, and the time for propulsion burying a plurality of steel pipes in the soil is the sum of the steel pipe propulsion burying time and the steel pipe welding time. The time is almost the same as the time for propulsion burying one steel pipe, and the time for propulsion burying a plurality of steel pipes is long due to the welding time of the steel pipes, and the work efficiency for propulsion burying steel pipes is poor.

In particular, in the case of the above-mentioned pipe loop construction method, since a large number of steel pipes are propulsively embedded so as to show a rectangular contour, if the time for propulsively embedding a plurality of steel pipes is long, the construction period of the pipe roof construction method as a whole is long. It will be long.

Therefore, an object of the present invention is to provide a propulsion-buried steel pipe and a steel pipe propulsion-buried construction method capable of solving the above-mentioned problems.

[0011]

A steel pipe for propulsion burying according to the present invention comprises a steel pipe body 2 which is a tubular body having the same cross-sectional shape over the entire length in the longitudinal direction, and an outer peripheral surface or an inner periphery of the steel pipe body 2. The outer cylinder 3 or the inner cylinder 4 is fitted and fixed to one end of the surface in the longitudinal direction so as to protrude from the one end surface 2a in the longitudinal direction of the steel pipe body 2. A first steel pipe propulsion burying method according to the present invention is
A steel pipe main body 2 that is a tubular body having the same cross-sectional shape over the entire length in the longitudinal direction, and an outer cylinder 3 or an inner cylinder 4 at one longitudinal end of the outer peripheral surface or the inner peripheral surface of the steel pipe main body 2. The steel pipe 1 for propulsion burying protruding and fitted and fixed from one end face 2a in the longitudinal direction of 2 is propulsion buried in the soil from the other end in the longitudinal direction of the steel pipe body 2, and the outside of the propulsion burying steel pipe 1 The other end in the longitudinal direction of the steel pipe main body 2 of the next steel pipe 1 for propulsion burying is fitted and connected to the pipe 3 or the inner pipe 4, and then propulsion burying is performed. The second method for propulsion and embedding a steel pipe according to the present invention comprises a steel pipe main body 2 which is a tubular body having the same cross-sectional shape over the entire length in the longitudinal direction, and one longitudinal end of the outer peripheral surface or the inner peripheral surface of the steel pipe main body 2. The outer cylinder 3 or the inner cylinder 4 in the part
The steel pipe 1 for propulsion embedding, which protrudes from the longitudinal one end surface 2a of the steel pipe main body 2 and is fitted and fixed, is propulsion embedded in the soil from one longitudinal end of the steel pipe main body 2, and the propulsion-embedded steel pipe 1 for propulsion embedding. At the other end in the longitudinal direction of the steel pipe body 2 of
The outer cylinder 3 or the inner cylinder 4 of the next steel pipe 1 for propulsion burying is fitted and connected, and then the propulsion burying is performed. The third method for burying steel pipes according to the present invention is the same as the first and second methods, except that when the steel pipe 1 for burying propulsion having the outer cylinder 3 fixed thereto is burial at the same time as the burial for blasting, The outer peripheral surface of the steel pipe body 2 is welded. A fourth steel pipe propulsion burying construction method according to the present invention is a method of propulsion burying a plurality of propulsion burying steel pipes 1 in the case of propulsion burying a propulsion burying steel pipe 1 having an inner cylinder 4 fixed in the first and second construction methods. After the burying is completed, the inner cylinder 4 and the inner peripheral surface of the steel pipe body 2 are welded.

[0012]

[Operation] In the case of the steel pipe for propulsion embedding of the present invention, the outer pipe 3, the inner pipe 4 and the other end in the longitudinal direction of the steel pipe main body 2 are fitted to each other so that the two steel pipes for propulsion embedding are concentric. Positioning,
In addition, the connection work can be done easily so that soil and sand will not invade or separate due to earth pressure. According to the first and second steel pipe propulsion embedding methods of the present invention, it is possible to connect a steel pipe that has already been propulsion buried and the next steel pipe by fitting, and the connecting work can be performed in a short time. Can be efficiently and buried in a short time. According to the third method of propulsion embedding of steel pipes of the present invention, the steel pipe that has already been propulsion-embedded and the next steel pipe are connected for propulsion embedding and, at the same time, the outer cylinder 3 and the steel pipe main body 2 are welded, so the connection strength of the two steel pipes It is possible to remarkably improve the function of preventing intrusion of earth and sand, and since the propulsion embedding of steel pipes is not interrupted due to welding, it is possible to efficiently propel and embed a plurality of steel pipes in a short time. According to the fourth steel pipe propulsion burying method of the present invention, the inner cylinder 4 and the steel pipe main body 2 are welded after the completion of the propulsion burying of a plurality of steel pipes. Can be remarkably excellent,
Since the propulsive embedding of steel pipes is not interrupted due to welding, it is possible to efficiently propel and embed a plurality of steel pipes in a short time.

[0013]

[Examples] (First embodiment of steel pipe for propulsion burying) As shown in FIG. 1, a steel pipe 1 for propulsion burying is a steel pipe main body 2 that is a tubular body having the same cross-sectional shape over the entire length in the longitudinal direction. An outer cylinder 3 fitted to one end in the longitudinal direction on the outer peripheral surface of the steel pipe body 2 and fixed by welding, and the outer cylinder 3 projects from the one end surface 2a in the longitudinal direction of the steel pipe body 2.

Because of this, the other end of the steel pipe main body 2 in the other steel pipe 1 connected as shown by the phantom line in FIG. 1 is fitted into the outer cylinder 3 of one steel pipe 1 connected. Thus, one steel pipe 1 and the other steel pipe 1 to be connected can be concentrically positioned and connected by abutting the other end face 2b in the longitudinal direction against the one end face 2a in the longitudinal direction.

(Second embodiment of steel pipe for propulsion burying) As shown in FIG. 2, a steel pipe 1 for propulsion burying is a steel pipe main body 2 which is a tubular body having the same sectional shape over the entire length in the longitudinal direction. The steel pipe body 2 comprises an inner cylinder 4 which is fitted to one end portion in the longitudinal direction of the inner peripheral surface of the steel pipe body 2 and fixed by welding, and the inner cylinder 4 projects from one longitudinal end surface 2a of the steel pipe body 2.

Because of this, it fits on the outer peripheral surface of the inner cylinder 4 of one steel pipe 1 which connects the other longitudinal ends of the steel pipe main body 2 of the other steel pipe 1 which is connected as shown in phantom in FIG. The other steel pipe 1 and the other steel pipe 1 which are connected by abutting the other end face 2b in the longitudinal direction against the one end face 2a in the longitudinal direction can be positioned and connected concentrically.

(Second Embodiment of Construction Method for Propulsively Embedding Multiple Steel Pipes for Propulsion Buried in Soil) As shown in FIG. 3A, a propulsion device 12 having a propulsion jack 11 in a starting shaft 10 is provided.
Then, the front conductor 15 including the cutter 13 and the screw and the casing 14 which are driven to rotate is set.

The cutter 13 is rotationally driven to excavate, and the excavated earth and sand is started by a screw and a casing 14 to a vertical shaft 1
Extend the propulsion jack 11 while transporting it to 0
5 is propelled into the soil as shown in FIG. 3 (b).

After propelling the front conductor 15 by a predetermined distance, the propulsion jack 11 is contracted, and as shown in FIG. 3C, the steel pipe 1 for propulsion embedding and the outer cylinder 3 on the rear side (propulsion jack 11 side).
Is connected to the rear end of the front conductor 15. A screw and a casing are provided in the steel pipe 1, and the screw and the casing are connected to the screw in the front conductor 15 and the casing 14.

The propulsion jack 11 is extended to embed the steel pipe 1 in the soil together with the tip conductor 15, and the propulsion jack 11 is contracted when the steel pipe 1 is propulsion-embedded for a predetermined distance, as shown in FIG. 3 (d).
The following steel pipe 1 is attached to the outer cylinder 3 of the steel pipe 1 already buried as shown in FIG.
The other end of the steel pipe main body 2 in the longitudinal direction is fitted and connected as shown in FIG.

As a result, the already buried steel pipe 1 and the next steel pipe 1 are concentrically connected, and one end face 2a in the longitudinal direction of the steel pipe body 2 and the other end face 2b in the longitudinal direction abut,
The thrust of the propulsion jack 11 can be reliably transmitted.

The steel pipe 1 in which the propulsion jack 11 is extended and connected with the tip conductor 15 is propulsively buried in the soil, and when the propulsion is buried for a predetermined distance, the next steel pipe 1 to be propulsion buried is connected and propulsion buried. By repeating this operation, the leading conductor 15
To the vertical shaft.

As described above, the outer peripheral surface of the steel pipe body 2 of the steel pipe 1 connected to the outer cylinder 3 may be welded by an automatic welding machine or the like when the connected steel pipes 1 are propulsively embedded. That is, since the steel pipes are concentrically positioned and connected by the outer cylinder 3, the outer cylinder 3 and the outer peripheral surface of the steel pipe body 2 can be welded in the starting shaft 10 while being propulsively buried by the propulsion jack 11. Becomes

(Another embodiment in which a plurality of steel pipes for propulsion burying are propulsion buried in the soil) As shown in FIG. 5, the steel pipe 1 for propulsion burying has one end in the longitudinal direction (outer cylinder 3 side) at the front. Steel pipe body 2 of steel pipe 1 that has been propulsion buried in the soil as the
The outer cylinder 3 of the steel pipe 1 to be next propulsion-embedded is fitted and connected to the other end in the longitudinal direction of, and then the propulsion jack 11 is extended to be propulsion-embedded.

In this case also, the outer jack 3 and the outer peripheral surfaces of the steel pipe body 2 may be welded in the starting shaft 10 with an automatic welding machine or the like at the same time as the propulsion jack 11 is extended and propulsion buried.

In each of the above-mentioned embodiments, the propulsion burying steel pipe 1 having the outer cylinder 3 is used, and when the propulsion burying steel pipe 1 having the inner cylinder 4 is used, FIG. 6 and FIG. As shown in FIG. 7, the steel pipe body 2 may be fitted and connected to the outer peripheral surface of the inner cylinder 4.

Further, after a plurality of steel pipes 1 have been propulsion-embedded and the internal components such as screws and casings in the respective steel pipes 1 have been removed, the inner cylinder 4 and the inner periphery of the steel pipe body 2 are removed from the steel pipes 1 by an automatic welding machine or the like. The faces may be welded.

[0028]

According to the steel pipe for propulsion burying of the present invention, the two pipes 1 for propulsion burying are concentric by fitting the outer cylinder 3, the inner cylinder 4 and the other end of the steel pipe main body 2 in the longitudinal direction. Positioned to
In addition, the connection work can be done easily so that soil and sand will not invade or separate due to earth pressure.

According to the propulsion burying method for steel pipes of claims 2 and 3, it is possible to connect the already propelled and buried steel pipe with the next steel pipe only, and the connecting work can be carried out in a short time. The steel pipe can be efficiently and buried in a short time. Therefore, the construction period of the pipe roof construction method for propulsively embedding a large number of steel pipes can be significantly shortened.

According to the steel pipe propulsion burying method of claim 4,
Since the steel pipe that has already been propulsion buried and the next steel pipe are connected for propulsion embedding and the outer cylinder 3 and the steel pipe main body 2 are welded at the same time, the connection strength of the two steel pipes and the function of preventing sediment intrusion can be significantly improved, and welding is possible. Because of this, the propulsion embedding of the steel pipes is not interrupted, so that it is possible to efficiently propel and embed a plurality of steel pipes in a short time.

According to the steel pipe propulsion burying method of claim 5,
Since the inner cylinder 4 and the steel pipe body 2 are welded after the completion of the propulsion embedding of a plurality of steel pipes, the connection strength of the two steel pipes and the function of preventing the intrusion of sand and sand can be remarkably excellent in the same manner as described above, and the welding of the steel pipes can be performed for welding. Since the propulsion embedding is not interrupted, multiple steel pipes can be propulsion buried efficiently in a short time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a steel pipe for propulsion burying of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the steel pipe for propulsion burying of the present invention.

FIG. 3 is an explanatory view in order of steps showing the first embodiment of the steel pipe propulsion burying method of the present invention.

FIG. 4 is a cross-sectional view showing a connected state of steel pipes.

FIG. 5 is a cross-sectional view showing a connected state of steel pipes.

FIG. 6 is an explanatory view showing a connected state of steel pipes in the case of another embodiment of the steel pipe propulsion burying method of the present invention.

FIG. 7 is a cross-sectional view showing a connected state of steel pipes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel pipe for propulsion burying 2 ... Steel pipe main body 3 ... Outer cylinder 4 ... Inner cylinder 5 ... Starting shaft 6 ... Propulsion jack 15 ... Lead conductor.

Claims (5)

[Claims] 1. A steel pipe for propulsion and embedding in a soil, which is a tubular body having a tubular shape with the same cross-section over the entire length in the longitudinal direction, and an outer peripheral surface or an inner peripheral surface of the steel pipe main body 2. A steel pipe for propulsion embedding in which an outer cylinder 3 or an inner cylinder 4 is fitted and fixed to one end portion in the longitudinal direction of the steel pipe main body 2 so as to project from the one end surface 2a in the longitudinal direction of the steel pipe body 2. 2. A steel pipe main body 2 which is a tubular body having the same cross-sectional shape over the entire length in the longitudinal direction, and an outer cylinder 3 or an inner cylinder 4 at one longitudinal end of the outer peripheral surface or the inner peripheral surface of the steel pipe main body 2. The steel pipe 1 for propulsion embedding, which protrudes from the longitudinal one end surface 2a of the steel pipe body 2 and is fitted and fixed, is propulsively embedded in the soil from the other end in the longitudinal direction of the steel pipe main body 2, and the propulsion embedding embedding is carried out. Outer cylinder 3 or inner cylinder 4 of the steel pipe 1
A method for propulsion embedding a steel pipe in which the other end portion in the longitudinal direction of the steel pipe body 2 of the next propulsion embedding steel pipe 1 is fitted and connected, and then the propulsion embedding is performed. 3. A steel pipe main body 2 which is a tubular body having the same cross-sectional shape over the entire length in the longitudinal direction, and an outer cylinder 3 or an inner cylinder 4 at one longitudinal end of the outer peripheral surface or the inner peripheral surface of the steel pipe main body 2. The steel pipe 1 for propulsion embedding, which protrudes from the longitudinal one end surface 2a of the steel pipe main body 2 and is fitted and fixed, is propulsively embedded in the soil from one longitudinal end of the steel pipe main body 2, and the propulsion-embedded for propulsion embedding A steel pipe propulsion embedding method in which the outer cylinder 3 or the inner cylinder 4 of the next propulsion embedding steel pipe 1 is fitted and connected to the other end in the longitudinal direction of the steel pipe body 2 of the steel pipe 1, and then the propulsion embedding is performed. . 4. The method according to claim 2 or 3, wherein when the steel pipe for propulsion burying 1 to which the outer cylinder 3 is fixed is propulsively embedded, the outer cylinder 3 and the outer peripheral surface of the steel pipe main body 2 are welded simultaneously with the propulsion embedding. Steel pipe propulsion burying method. 5. When the propulsion burying steel pipe 1 having the inner cylinder 4 fixed thereto is propulsively embedded, the inner cylinder 4 and the inner peripheral surface of the steel pipe main body 2 are welded after the completion of the propulsion embedding of the plurality of propulsion burying steel pipes 1. The method for propulsion and burying a steel pipe according to claim 2 or 3.