JP2501355Y2 - Pipe end structure of propulsion pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pipe end structure of a propulsion pipe buried in the ground by a propulsion method.

(Prior Art) A propulsion method has been developed as a method for laying pipes buried underground such as sewer pipes, water pipes, and cable protection pipes. In the propulsion method, a vertical shaft is formed in the ground, a horizontal shaft is dug from the vertical shaft, and at the same time, a propulsion pipe is propelled into the horizontal shaft, and a subsequent propulsion pipe is connected to an end of the horizontal shaft. At the same time as digging, the propulsion force is applied to the subsequent propulsion pipe to lay a pipe line.

FIG. 6 shows an example of a connecting structure of the propulsion pipes propelled in the underground shaft by the propulsion method. As the propulsion pipe 50, a composite pipe in which the inner peripheral surface and the outer peripheral surface of a tubular resin concrete layer 53 are covered with an inner layer 51 and an outer layer 52 made of glass fiber reinforced plastic (FRP) is usually used.

An insertion opening 54 is provided at the pipe end of the propulsion pipe 50 so as to be inserted into one side of the cylindrical collar 60. In the collar 60, the insertion portions of the pair of propulsion pipes 50 are inserted into the respective side portions, so that both propulsion pipes 50 are connected. The insertion opening 54 is formed by removing the outer peripheral portions of the outer layer 52 and the resin control layer 53 so that the outer diameter of the insertion opening 54 is smaller than that of the other pipe main body 56. The exposed outer peripheral surface of the resin concrete layer 53 is covered with a reinforcing FRP layer 55.

When connecting the pair of propulsion pipes 50 to each other, for example,
For example, with the rubber seal rings S fitted in the respective insertion openings 54, the respective insertion openings 54 are inserted into the respective ends of the collar 60. The collar 60 has the same outer diameter as the outer diameter of the pipe body 56 except the insertion port 54 of the propulsion pipe 50, and when the collar 60 is propelled together with the propulsion pipe 50, the propulsion added to the collar 60. Resistance is suppressed.

(Problems to be Solved by the Invention) In such a propulsion pipe connection structure, the seal ring S is fitted to the insertion portion 54 at the rear end of the propulsion pipe 50 propelled in the underground shaft. And one side of the collar 60 is fitted into the other side of the collar 60,
The insertion port 54 at the tip of the 50 is inserted with the seal ring S fitted. Then, the propulsive force is applied to the subsequent propulsion pipe 50, and the collar 60 is generated inside the horizontal shaft formed in the ground.
The pair of propulsion pipes 50 connected to each other is propelled. As a result, for example, as shown in FIG. 7, a large number of propulsion pipes 50 are provided between the pair of human holes 70 that are buried at a predetermined distance.
The pipeline constructed by is laid.

With the pipeline laid in this manner, for example, when the ground at that portion sinks, a force is applied so that the pipeline bends downward.

Since the propulsion pipe 50 having the resin concrete layer 53 has high rigidity, even if a force is applied so that the pipe line is bent downward, each propulsion pipe 50 itself forming the pipe line is not likely to be bent. . For this purpose, as shown in FIG.
The pair of propulsion pipes 50 and 50 connected by means of each other are inclined with respect to each other so as to form a V shape. In such a state, the lower portions of the end faces of the respective insertion portions 54 abutted against each other in the collar 60 are in a state of being separated from each other, and the lower portions of the end faces of the respective insertion portions 54 are the inner peripheral surface of the collar. Is in contact with. As a result, the compressive stress applied from the collar 60 is concentrated on the upper portion of the resin concrete layer 53 located at the base end portion of the insertion opening 54, and the tensile stress is concentrated on the lower portion.
In such a state, the resin concrete layer 53,
Since the tensile strength is low, a crack may occur in the lower portion of the base end portion of the insertion portion 54 where the tensile stress is concentrated, and the portion may be broken.

The present invention solves the above-mentioned conventional problems, and its purpose is to provide a concrete layer at the base end portion of the insertion opening even if the ground subsides in a state where a pipeline constituted by a propulsion pipe is laid. It is an object of the present invention to provide a pipe end structure of a propulsion pipe which is free from the risk of cracking.

(Means for Solving the Problem) A pipe end structure of a propulsion pipe according to the present invention comprises a tubular concrete layer, and a plastic inner layer for covering the inner peripheral surface of the concrete layer and the outer peripheral surface excluding the end, respectively. An insertion part having a pipe main body having an outer layer, a tank layer and an inner layer continuous with the concrete layer and the inner layer of the pipe main body, and the outer diameter of the concrete layer being smaller than the concrete layer of the pipe main body. And a tensile strength with which the tip of the concrete layer where the outer layer at the end of the pipe body is not covered continuously and closely adheres from the outer peripheral surface to the outer peripheral surface of the concrete layer at the base end of the insertion opening. An excellent reinforcing ring, a concrete layer in which the outer layer of the pipe body is not coated, and a first coating layer which closely coats the reinforcing ring fitted to the concrete layer, The above-mentioned object is achieved by comprising a concrete layer in the mouth portion and a second coating layer which closely coats the reinforcing ring fitted to the concrete layer.

(Operation) When tensile stress acts on the base end portion of the insertion portion of the propulsion pipe, the tensile stress is retained by the reinforcing ring. Since the reinforcing ring has excellent tensile strength and is held on the outer peripheral surface of the concrete layer in the pipe body of the propulsion pipe, the tensile stress is dispersed in the concrete layer of the pipe body by the reinforcing ring. .

(Examples) Hereinafter, the present invention will be described with reference to examples.

The propulsion pipe having the pipe end structure of the propulsion pipe of the present invention is
As shown in the figure, the insertion port 14 at the pipe end and the insertion port
It has a pipe body 15 except for 14. The pipe body 15 includes a tubular resin concrete layer 13 and the resin concrete layer.
Inner layer 11 and outer layer 12 made of glass fiber reinforced plastic (FRP) covering the inner and outer peripheral surfaces of 13
And is a composite pipe having. The outer layer 12 that covers the outer peripheral surface of the resin concrete layer 13 is not covered on the end portion of the pipe body 15 that is continuous with the insertion portion 14.

The insertion port 14 is a FR that is continuous with the inner layer 11 of the pipe body 15.
It has an inner layer 16 made of P and a resin concrete layer 17 which is continuous with the resin concrete layer 13 in the pipe body 15 and has an outer diameter smaller than that of the resin concrete layer 13.

In the propulsion pipe 10, a reinforcing ring 20 is fitted from the base end of the insertion opening 14 to the tip of the end of the pipe main body 15 where the outer layer 12 is removed from the base end. There is.

The reinforcing ring 20 has a large diameter portion 21 that covers the outer periphery of the tip end portion of the resin concrete layer 13 extending from the outer layer 12 in the pipe body portion 15 of the composite pipe 10, and one of the large diameter portions 21 A small-diameter portion 23 is connected to the end portion of the through a connecting portion 22 orthogonal to the axis. The connecting portion 22 is in contact with a tip end surface of the tube body portion 15 of the propulsion tube 10 which is orthogonal to the axial direction of the resin concrete layer 13 to cover the tip end surface, and the small diameter portion 23 of the composite tube 10 is provided. The outer peripheral surface of the insertion portion 14 except for the tip of the resin concrete layer 17 is in close contact with and covers the outer peripheral surface.

The thickness of the reinforcing ring 20 is smaller than the thickness of the outer layer 12 in the pipe body 15 of the propulsion pipe 10.

The reinforcing ring 20 is made of a material having a tensile strength sufficiently higher than that of the resin concrete layers 13 and 17 of the propulsion pipe 10, for example, metal such as stainless steel or iron, ceramics, plastic or the like.

The reinforcing ring 20 is fixed to the outer peripheral surfaces of the resin concrete layer 13 in the pipe body 15 of the propulsion pipe 10 and the resin concrete layer 17 in the insertion portion 14 by a pair of coating layers 31 and 32, respectively. On the other hand, the first coating layer 31 made of glass fiber reinforced plastic is used for the large diameter portion 2 of the reinforcing ring 20 that covers the tip of the tube body 15 of the propulsion tube 10.
1 and the outer peripheral surface of the resin concrete layer 13 continuous with the large-diameter portion 21 of the reinforcing ring 20 so as to closely cover them. The outer diameter of the first coating layer 31 made of glass fiber reinforced plastic is equal to the outer diameter of the tube body portion 15, and both outer peripheral surfaces are smoothly continuous.

Second glass fiber reinforced plastic second coating layer 32
Is a small-diameter portion of the reinforcing ring 20 that covers the base end of the insertion opening 14.
23, and the outer peripheral surface of the resin concrete layer 17 extending from the small diameter portion 23 is closely adhered to and covers them. The outer diameter of the second coating layer 32 made of glass fiber reinforced plastic is also constant.

The collar 60 inserted into the insertion port 14 has a cylindrical shape with a constant outer diameter and inner diameter over its entire length, and its outer diameter is substantially equal to the outer diameter of the pipe body 15 of the propulsion pipe 10. The inner diameter is slightly larger than the outer diameter of the second coating layer 32 of the insertion opening 14 of the propulsion tube 10. The total length of the collar 60 is almost twice as long as the total length of the insertion portion 14 of the propulsion tube 10. The collar 60 is inserted into the insertion port 14 of the propulsion pipe 10.
A rubber seal ring S, which is in pressure contact with the inner peripheral surface, is externally fitted.

With the pipe end structure of the propulsion pipe of the present invention having such a configuration,
A pair of propulsion pipes 10 laid in the ground by the propulsion method are laid in the ground as follows.

When the leading propulsion pipe 10 is pushed into the underground shaft with the rear end portion left, the covering layer 32 is fitted onto the covering layer 32 of the insertion opening 14 at the rear end portion of the covering layer 32. The one side of the collar 60 is fitted on the outside. Next, the seal ring S is externally fitted to the coating layer 32 of the insertion port 14 located at the tip of the subsequent propulsion pipe 10, and the coating layer 32 is inserted into the other side portion of the collar 60. As a result, the preceding propulsion pipe 10 and the subsequent propulsion pipe 10 are connected in a liquid-tight state. Then, by pushing the subsequent propulsion pipe 10 into the side shaft while digging the side shaft, a pair of connected propulsion pipes 10 and 10 are laid.

In this way, by sequentially connecting the propulsion pipes 10 and propelling them into the ground, a pipe line is laid over a predetermined length. After that, when a downward pressure acts due to ground subsidence on a part of the pipeline constituted by a large number of propulsion pipes 10,
Interconnected propulsion tubes 10 and 10 on which the pressure acts
Are inclined so that they are V-shaped with respect to each other.
As a result, the lower portions of the abutted end surfaces of the respective insertion portions 14 are separated from each other in the collar 60. As a result, in each propulsion pipe 10, a tensile stress acts on the lower portion of the proximal end portion of the insertion opening 14. However, since the reinforcing ring 20 is externally fitted from the tip of the resin concrete layer 13 in the pipe body 15 of the propulsion pipe 10 to the base end of the resin concrete layer 17 of the insertion port 14, the insertion port 14 The tensile stress acting on the base end portion of the element acts on the reinforcing ring 20. The reinforcing ring 20 is held by the thick resin concrete layer 13 in the pipe body portion 15 of the propulsion pipe 10, and since it is made of a material having excellent tensile strength, it receives tensile stress. There is no risk of deformation or damage. Therefore, the insertion part
Tensile stress acting on the base end portion of 14 is applied to the resin concrete layer 13 of the pipe main body portion 15 via the large diameter portion 21 of the reinforcing ring 20.
It is dispersed at the tip portion and is not transmitted to the base end portion of the resin concrete layer 17 in the insertion portion 14. Therefore, there is no possibility that a crack will occur at the base end portion of the resin concrete layer 17 of the insertion portion 14.

The reinforcing ring 20 used in the pipe end structure of the propulsion pipe according to the present invention, as shown in FIG. 2, has the outer peripheral surfaces of the large diameter portion 21 and the small diameter portion 23 separated from the connecting portion 22. The structure may be such that the diameter is gradually reduced. Reinforcement ring with such a structure
By using 20, the thickness of the first coating layer 31 and the second coating layer 32 for fixing the reinforcing ring 20 is sequentially changed along the axial direction, so that the strength thereof can be increased.

Further, as shown in FIG. 3, in order to enhance the adhesive force of the first coating layer 31 and the second coating layer 32 to the reinforcing ring 20, the outer circumferences of the small diameter portion 21 and the large diameter portion 23 of the reinforcing ring 20. A structure in which an annular protrusion 24 is provided on the surface can also be adopted.

Further, in the pipe end structure of the propulsion pipe of the present invention, as shown in FIG. 4, the outer peripheral surfaces of the large diameter portion 21 and the small diameter portion 23 of the reinforcing ring 20 are the resin concrete layers 13 and 17 of the propulsion pipe 10. The large diameter portion 21 and the small diameter portion 23 of the reinforcing ring 20 on the outer peripheral surface of the
May be embedded. In the pipe end structure of the propulsion pipe of the present invention having such a configuration, the thickness of the first coating layer 31 and the second coating layer 32 for fixing the reinforcing ring 20 is made uniform in the axial direction. The reinforcing ring 20 is firmly fixed to the outer peripheral surfaces of the resin concrete layers 13 and 17. Moreover, there is an advantage that the thickness of the reinforcing ring 20 is not restricted by the thickness of the outer layer 13 of the propulsion pipe 10.

In addition, as shown in FIG. 5, an annular protective cap 40 made of the same material as the reinforcing ring 20 extends from the outer peripheral surface of the resin concrete layer 17 in the insertion portion 14 of the propulsion pipe 10 to the front surface. The tip of the propulsion pipe 10 may be protected by covering it.

(Effect of the Invention) In this way, the pipe end structure of the propulsion pipe of the present invention covers the base end of the concrete layer of the insertion opening with the reinforcing ring supported by the concrete layer at the end of the pipe body. Therefore, for example, the tensile force applied to the insertion end base end portion by ground subsidence or the like after pipe laying is retained in the large diameter concrete layer by the reinforcing ring, and at the base end portion of the insertion opening portion. There is no risk of cracks in the concrete layer.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an example of a pipe end structure of a propulsion pipe of the present invention, FIGS. 2 to 5 are sectional views of an essential part showing different examples thereof, and FIG. 6 is a conventional propulsion. Sectional view showing the pipe end structure of the pipe, Fig. 7 is a schematic view showing the laying state of the propulsion pipe, and Fig. 8 is a cross section showing the state of the propulsion pipe when subsidence occurs in the ground where the propulsion pipe is laid. It is a figure. 10 …… Propulsion pipe, 11 …… Inner layer, 12 …… Outer layer, 13 …… Resin concrete layer, 14 …… Inlet part, 16 …… Inner layer, 17 …… Resin concrete layer, 20 …… Reinforcement ring, 31… ... first coating layer, 32 ... second coating layer.

Claims (1)

(57) [Scope of utility model registration request] 1. A tubular concrete layer, a pipe main body having a plastic inner and outer layers respectively covering an inner peripheral surface and an outer peripheral surface of the concrete layer excluding end portions, and a concrete layer of the pipe main body, The inner layer has a continuous tank layer and inner layer, the outer diameter of the concrete layer is smaller than that of the concrete layer of the pipe main body, and the outer layer at the end of the pipe main body is not covered with concrete. Reinforcement ring with excellent tensile strength that continuously adheres and covers from the outer peripheral surface of the tip of the layer to the outer peripheral surface of the concrete layer at the base end of the insertion port, and the outer layer of the pipe body is not covered A first coating layer for closely covering a concrete layer and a reinforcing ring fitted to the concrete layer, a concrete layer at an insertion portion, and the concrete A second coating layer that closely coats the reinforcing ring fitted to the layer, and a pipe end structure of the propulsion pipe.