JP5704488B2 - Propulsion pipe connection structure - Google Patents

Description

  The present invention can suitably transmit propulsive force between propulsion pipes made of fume pipes, steel pipes, ceramic pipes and the like when constructing pipes such as sewers by the propulsion method, particularly bent pipes. The present invention relates to the structure of the connecting portion of the propulsion pipe.

  Conventionally, in the construction of pipelines using the propulsion method, a plurality of propulsion pipes made of a fume pipe manufactured at the factory are sequentially connected to the rear of the excavator and the rear end propulsion pipe is pressed with a jack or the like. Propulsive force is applied so that a plurality of propulsion pipes are pressed into the ground in a continuous arrangement.

  In this propulsion method, in addition to the so-called “linear propulsion” in which the propulsion pipes are arranged in a linear arrangement, the so-called “curve” in which the axial directions of the propulsion pipes to be arranged are shifted from each other and the propulsion pipes are arranged in a bent arrangement. "Promotion" is known.

  In the connection part of each propulsion pipe in the propulsion method, there is a risk of cracking if the end faces of the concrete propulsion pipes are brought into contact with each other directly, especially in the case of curved propulsion, Since the axial direction of the rear propulsion pipe is shifted, the rear end face of the front propulsion pipe and the front end face of the rear propulsion pipe are in contact with each other only at a part on the inner side in the bending radial direction. When this occurs, stress concentrates on one point of the contact portion, and the propulsion pipe is easily cracked.

  In view of such problems, conventionally, a buffer material or the like is interposed between the rear end face of the front propulsion pipe and the front end face of the rear propulsion pipe (for example, Patent Document 1). Some of these cushioning materials use an elastic body such as foamed urethane resin and are deformed by a compressive force acting between both front and rear end faces of the propulsion pipe (for example, Patent Document 2).

  In addition, as the structure of the connecting portion of the propulsion pipe for preventing the stress concentration described above, a fluid such as water or oil is sealed between the rear end face of the front propulsion pipe and the front end face of the rear propulsion pipe. A structure in which a plurality of bag-like intermediate members are arranged in the circumferential direction of the pipe and the intermediate members are communicated with each other by a communication pipe has been developed (for example, Patent Document 3).

  In this connection portion structure, when the shape of the portion between the end surfaces of the propulsion pipes that are connected back and forth is changed during the propulsion process, the fluid in the intermediate member arranged at a position where the distance between the both end surfaces is reduced. Is moved to the intermediate member disposed at a position where the distance between the end faces is increased through the communication pipe by being pressed by both end faces, so that the propulsive force can be distributed and transmitted between the end faces of the two propulsion pipes via the intermediate member. I have to.

JP 2009-235785 A JP 07-158743 A JP 2001-288984 A

  However, in the conventional technique as shown in Patent Document 1 described above, the shape of each portion between the propulsion pipes changes variously in the process of curve propulsion, so that a gap is generated between the end faces of the propulsion pipes corresponding to such changes. It is difficult to preliminarily install the cushioning material so that there is a gap at the outer side in the bending radius direction at the connecting portion of the propulsion pipe, and there is a problem that the propulsive force is not suitably distributed.

  Moreover, in the prior art shown in Patent Document 2, an elastic body such as a foamed polystyrene resin is used to cope with the above-described changes, but a part of the elastic body has a bending radius at the front side of the curve propulsion process. When the position is located on the inner side in the direction and then moved to the outer side in the bending radius direction, the part deformed by the compressive force from the both end faces does not return elastically at the inner side in the bending radius. Further, since the portion remains thin in the bending circumferential direction, a gap is generated between the end faces at the outer side of the bending radius, and there is a problem that the propulsive force is not dispersed.

  On the other hand, in the conventional technique shown in Patent Document 3 described above, there is a problem in that the transmission efficiency is poor because the propulsive force is transmitted between the two propulsion pipes that are connected using fluid such as water or oil as a medium. .

  Therefore, in view of such conventional problems, the present invention suitably distributes the propulsive force between the propulsion pipes composed of a fume pipe or the like when constructing a pipe such as a sewer by the propulsion method, particularly a bent pipe. In addition, the present invention has been made for the purpose of providing a connecting portion structure of a propulsion pipe that can transmit efficiently.

  The feature of the invention described in claim 1 for solving the conventional problems as described above and achieving the intended purpose is that the rear end face of the front propulsion pipe and the rear propulsion pipe connected to each other by the propulsion method are provided. In the structure of the connecting portion of the propulsion pipe formed by interposing an intermediate member between the front end surface and the intermediate member, the intermediate member is filled with an infinite number of spherical bodies inside a bag-shaped member formed in a deformable bag shape. The infinite number of spherical bodies are pressed between the both end faces when a change occurs in the shape between the end faces of the two propulsion pipes in the course of propulsion, and between the both end faces in the bag-like member. The movement is from the side where the distance is narrowed toward the side where the distance between the both end faces is widened.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, a lubricating fluid is sealed in the bag-shaped member, and the fluid is filled between the spherical bodies.

  A feature of the invention described in claim 3 is that, in addition to the configuration of claim 1 or 2, the bag-like member is formed in a hollow annular shape.

  According to a fourth aspect of the present invention, in addition to the structure of the first, second, or third aspect, the spherical body has a particle size of 50 μm to 1000 μm.

  According to a fifth aspect of the present invention, in addition to the configuration of the first to third or fourth aspects, the bag-like member is formed by forming a high-strength fiber material such as carbon fiber into a bag shape.

  As described above, the structure of the connecting portion of the propulsion pipe according to the present invention has an intermediate member interposed between the rear end face of the front propulsion pipe and the front end face of the rear propulsion pipe that are connected to each other by the propulsion method. In the propulsion pipe connecting portion structure, the intermediate member is configured by filling countless spherical bodies inside a bag-shaped member formed in a deformable bag shape. When a change occurs in the shape between the end faces of the two propulsion pipes in the process, the distance between the both end faces from the side where the distance between the both end faces in the bag-like member is reduced by being pressed by the both end faces. By moving toward the spreading side, it is possible to transmit the propulsive force efficiently and uniformly between the end surfaces of the propulsion pipes connected to the front and rear.

  In the present invention, a lubricating fluid is sealed in the bag-shaped member, and the fluid is filled between the spherical bodies, so that the spherical body can move smoothly in the bag-shaped member.

  Furthermore, in this invention, the said bag-shaped member can transmit a driving force uniformly by being formed in the hollow annular | circular shape.

  Furthermore, in the present invention, since the spherical body has a particle size of 50 μm to 1000 μm, the spherical body can smoothly move in the bag-shaped member.

  In the present invention, the bag-like member is formed by forming a high-strength fiber material such as carbon fiber in a bag shape so that it is not damaged even when a driving force is applied.

It is an example of the connection part structure of the propulsion pipe which concerns on this invention, Comprising: It is a longitudinal cross-sectional view which shows the linear part of a pipe line. It is a longitudinal cross-sectional view which shows the curvilinear part of a pipe line same as the above. It is a partial expanded sectional view which shows the internal structure of the intermediate member in FIG. It is another example of the connection part structure of the propulsion pipe which concerns on this invention, Comprising: It is a longitudinal cross-sectional view which shows the curved part of a pipe line.

  Next, an embodiment of the connecting portion structure of the propulsion pipe according to the present invention will be described based on the embodiment shown in FIGS. In the figure, reference numeral 1 denotes a propulsion pipe made of a fume pipe or the like.

  In the construction of the pipeline by the propulsion method, a plurality of propulsion pipes 1, 1... Are sequentially connected to the rear of the excavator, and the propulsion force of the excavation is applied by pressing the propulsion pipe at the rear end with a jack or the like. Thereby, a plurality of propulsion pipes 1, 1... Are press-fitted into the ground in a continuous arrangement.

The propulsion pipe 1 used in this propulsion method is composed of a reinforced concrete fume pipe formed into a cylindrical shape, and is fixed to the rear end portion of the front propulsion pipe 1a and is located behind the outer peripheral collar 2 protruding rearward. Propulsion pipe 1b By inserting the front end portion, the front and rear directions are connected.

  In the figure, reference numeral 3 denotes a rubber seal material. The seal material 3 fixed to the inner surface of the outer collar 2 is brought into close contact with the outer peripheral portion of the small-diameter portion 4 of the rear propulsion tube 1b. , 1b is designed to stop water.

  On the other hand, in this connecting structure of the propulsion pipe, an intermediate member 10 is interposed between the rear end face 5a of the forward propulsion pipe 1a and the front end face 5b of the rear propulsion pipe 1b, and the intermediate member 10 is interposed therebetween. Thus, the propulsive force is transmitted between the propulsion pipes 1a and 1b.

  The intermediate member 10 is configured by filling countless spherical bodies 12, 12... Into a hollow annular bag-shaped member 11 having a shape along the circumferential direction of the end faces 5a, 5b, and in the course of propulsion. The two propulsion pipes 1a, 1b are deformed in accordance with the change in the shape between the end faces, and function as a cushioning material when a propulsive force acts between the propulsion pipes 1a, 1b. It is designed to transmit between 5b.

  The bag-shaped member 11 is formed of a high-strength fiber material such as carbon fiber so as to be able to enclose fluids such as water, oil, compressed air, and the like, and a large number of spherical bodies 12, 12. The shape can be changed in conjunction with the movement.

  The bag-like member 11 is fixed to the end surfaces 5a and 5b by adhesives or the like in a certain range of portions facing the end surfaces 5a and 5b, and changes its shape in conjunction with the change in the distance between the end surfaces 5a and 5b. It is like that.

  The bag-like member 11 is filled with a fluid 13 for lubrication such as water or oil, and a gap between the spherical bodies 12 and 12 is filled with the fluid 13.

  The spherical body 12 is formed into a spherical shape having a particle diameter of 50 μm to 1000 μm with a material having a strength capable of withstanding pressurization by a propulsive force such as a steel material or a hard plastic material. In particular, it is preferable to form a particle size of about 500 μm. In addition, as for each spherical body 12,12 ..., you may use the thing of the same particle size, and you may use it combining a thing with a different particle size.

  In the connecting structure of the propulsion pipe configured as described above, in the linear propulsion portion, as shown in FIG. 1, innumerable spherical bodies 12, 12... Are distributed substantially uniformly in the bag-shaped member 11. When a propulsive force is applied between both end surfaces 5a and 5b of the propulsion pipes 1a and 1b connected to the front and rear, if the intermediate member 10 is pressed against both end surfaces 5a and 5b and the pressing force exceeds a certain level, the intermediate member 10 is adjacent. The spherical bodies 12, 12... Are stable in a state where they are in contact with each other and supported by each other, and the spherical bodies 12, 12. In this state, the propulsive force is uniformly and efficiently transmitted between the both end faces 5a and 5b via the spherical bodies 12, 12.

  On the other hand, when this propulsion pipe moves from the linear propulsion section to the curved propulsion section in the course of propulsion, the propulsion pipes 1a and 1b connected to the front and rear are the reaction force received by the front in the propulsion direction, the propulsion force by the jack, and the inner surface of the digging hole Due to the ground reaction force received and the like, the axial center direction is shifted, the connecting portion is bent, and the shape between the end faces changes accordingly. That is, the distance between both end faces 5a and 5b is narrowed on the inner side in the bending radius direction and increased on the outer side of the bending radius.

  As a result, the intermediate member 10 is pulled in a direction where the distance between both end surfaces 5a and 5b is increased, that is, in the direction in which the tube-shaped cross-sectional area of the hollow portion of the bag-like member 11 is increased at the outer side in the bending radius direction. , 5b is reduced, while the portion on the side where the distance between both end faces 5a, 5b is narrowed, that is, on the inner side in the bending radial direction, is pressed in the direction in which the tube circumferential direction cross-sectional area of the bag-like member 11 is narrowed. The pressure received from both end faces 5a, 5b increases, and the support state between the spherical bodies 12, 12,... In the bag-like member 11 becomes unstable.

  Accordingly, the spherical bodies 12, 12... In the bag-like member 11 are pressed by the force received from the both end faces 5a, 5b as shown in FIG. The member 11 moves from the side where the distance between both end surfaces 5a, 5b is narrowed toward the side where the distance between both end surfaces 5a, 5b is increased.

  The spherical bodies 12, 12... Adjacent to each other at the position after the movement are stable in a state where they are in contact with each other and supported by each other, and even when the connecting portion is bent, The propulsive force is uniformly and efficiently transmitted between the both end faces 5a, 5b via 12, 12,.

  On the other hand, even when bending from the curved propulsion unit to the linear propulsion unit or the other direction during the propulsion process, the spherical bodies 12, 12... In the bag-like member 11 are pressed by the force received from both end surfaces 5a, 5b. Then, it moves from the side where the distance between both end faces 5a, 5b in the bag-like member 11 is narrowed to the side where the distance between both end faces 5a, 5b is widened. And stable in a state of supporting each other, and the propulsive force is uniformly and efficiently transmitted between the both end faces 5a, 5b through the spherical bodies 12, 12,.

  In the above-described embodiment, the example in which the propulsion pipe is constituted by a fume pipe has been described. However, the propulsion pipe may be constituted by a steel pipe, a ceramic pipe, or the like.

  Further, in the above-described embodiment, the propulsion pipe connecting portion structure having only the outer peripheral collar 2 has been described, but the connecting portion structure may be a structure having an inner peripheral collar 20 as shown in FIG. Good. In the figure, reference numeral 21 denotes a widened portion for bending which is formed in a tapered shape which is widened to the front end surface side on the front end inner peripheral surface portion of the rear propelling pipe 1b, and reference numeral 22 is a connection sleeve which is formed into a cylindrical shape with a rubber material or the like. It is.

DESCRIPTION OF SYMBOLS 1a Front propulsion pipe 1b Back propulsion pipe 2 Outer periphery collar 3 Sealing material 4 Small diameter part 5 End surface 10 Intermediate member 11 Bag-like member 12 Spherical body 13 Fluid 20 Inner circumference collar 21 Widening part 22 for bending Connection sleeve

Claims (5)

In the structure of the connecting portion of the propulsion pipe formed by interposing an intermediate member between the rear end face of the front propulsion pipe and the front end face of the rear propulsion pipe connected to each other by the propulsion method,
The intermediate member is configured by filling an infinite number of spherical bodies inside a bag-shaped member formed in a deformable bag shape, and the infinite number of spherical bodies are formed between the end surfaces of the two propulsion pipes in the course of propulsion. When a change occurs in shape, it moves from the side where the distance between the both end faces in the bag-like member is reduced by being pressed by the both end faces toward the side where the distance between the both end faces is widened. The connecting structure of the propulsion pipe.   The structure for connecting a propulsion pipe according to claim 1, wherein a fluid for lubrication is sealed in the bag-like member, and the fluid is filled between the spherical bodies.   The connecting structure for a propulsion pipe according to claim 1, wherein the bag-shaped member is formed in a hollow annular shape.   The propulsion-pipe connection portion structure according to claim 1, 2 or 3, wherein the spherical body has a particle size of 50 µm to 1000 µm.   The propulsion pipe connecting portion structure according to claim 1, wherein the bag-shaped member is formed by forming a high-strength fiber material such as a carbon fiber material into a bag shape.

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