JP3056802U - Taper cut propulsion pipe at pipe end face - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to a propulsion pipe that prevents damage to the end of a concrete pipe when performing propulsion work.
In particular, it is an object of the present invention to provide a propulsion pipe for preventing a pipe end face from being damaged when a large propulsive force acts on the pipe end as in the case of long-distance curved propulsion construction. The present invention provides a concrete propulsion pipe used in a curved propulsion method, in which a notch is provided by gradually sloping the end face of the propulsion pipe toward the outside of the pipe at a symmetrical position or a vertically symmetrical position, This is a tapered cut propulsion pipe on the pipe end face to which a cushion material is fixed at a vertically symmetric position or a left / right symmetric position where a notch is not provided.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a propulsion pipe that prevents damage to the concrete pipe end when performing curved propulsion work.In particular, a large propulsion force is applied to the pipe end as in the case of long-distance curve propulsion construction. The purpose of the present invention is to provide a propulsion pipe for preventing a pipe end from being damaged when it operates.

[0002]

[Prior art]

 The propulsion work is a method of excavating the ground with an excavator at the tip of the excavator while pressing the rear end face of the propulsion pipe with the main pushing equipment installed in the starting shaft, and burying the propulsion pipe. . The propulsion force for excavating the excavator and the propulsion pipe is the resistance of excavation and penetration at the tip and the frictional resistance between the propulsion pipe and the outer ground. The resistance at the tip is almost constant unless there is a change in soil quality, but the frictional resistance between the propulsion pipe and the outer ground increases in proportion to the increase in propulsion length. For this reason, since a large propulsive force gradually acts on the propulsion pipe, a concrete pipe having relatively large compressive force is generally used as the propulsion pipe.

[0003]

[Problems to be solved by the invention]

 Normally, in linear propulsion construction with a short propulsion length, only a small axial propulsion acts on the propulsion pipe, and the propulsion has sufficient margin against the axial permissible compression force of the propulsion pipe for safe and efficient operation. Good propulsion construction is performed.

[0004] However, due to problems such as construction pollution in urban areas in recent years, starting shafts constructed on roads are also subject to construction pollution. To reduce the number of starting shafts to be installed, long-distance curved propulsion construction is required. Many propulsions are planned, and in the curved section, a bend is formed at the joint of each propulsion pipe, so that a large propulsion acts on only a part of the inside of the pipe end face, or a bias is applied. As a result, cracks and breakage occur on the end face of the propulsion pipe. As a result, the propulsion force cannot be transmitted effectively, and the propulsion work is interrupted to repair and reinforce cracks and damaged parts with high-strength cement or resin material each time. At present, it is not possible to take appropriate measures, causing damage at the same location again, etc., which is delaying the construction period and increasing repair costs.

[0005] Therefore, the present invention provides a propulsion pipe in which propulsion force is not concentrated inside the end face of the propulsion pipe during long-distance curved propulsion construction, and cracks or breakage do not occur on the pipe end face.

[0006]

[Means for Solving the Problems]

 That is, the present invention provides a concrete propulsion pipe used in the curving propulsion method, in which a notch is formed by gradually grading the end face of the propulsion pipe toward the outside of the pipe at a symmetric position or a vertically symmetric position. A tapered cut propulsion tube with a cushioning material attached to the vertically symmetrical position or the left-right symmetrical position where no section is provided.

[0007] In order to make the cushioning material easily follow the tunnel hole formed by the excavator, in the formation of the curve in the horizontal direction, the cushioning material is provided only on the upper and lower portions of the end face of the propulsion pipe, and the left and right end faces are provided. , The formation of the left and right bent angles is facilitated, and the ability to follow the tunnel hole is improved. In the formation of a curve in the vertical direction, cushioning materials are provided on the left and right portions of the end face of the propulsion pipe to facilitate the formation of a vertical bending angle.

The notch provided on the end face of the propulsion pipe may be provided on the rear end face of the propulsion pipe. However, since the rear end face is provided with a steel collar on the outer periphery, it is difficult to process the same. Is provided. The notch is provided at the symmetrical position on the left and right of the propulsion pipe when forming a horizontal curve, and is provided at the symmetrical position above and below the propulsion pipe when forming a vertical curve. The notched thickness is determined by considering the radius of the curve, the material and thickness of the cushion material, and the diameter of the pipe, and the thickness at which the end face inside the curve does not touch. In the case of only one of the left, right, upper and lower curves, the cutout of the end face of the propulsion pipe may be one of only the inside of the curve. As the notch method, a method of cutting on site is also possible, but a method of processing the end face formwork at the time of manufacturing the propulsion pipe at the factory is generally effective.

The arrangement of the notch and the cushion material may be changed depending on the material and thickness of the cushion material, the thickness of the notch, and the like, but first, in a range divided into approximately four equal parts in the circumferential direction. The arrangement may be determined at a vertically symmetric position or a left-right symmetric position, and then the material and thickness of the cushion material and the thickness of the notch may be determined.

[0010] With the tapered cut propulsion pipe configured as described above, even if the propulsion pipe enters a curved portion and the joint portion of the propulsion pipe forms a bend angle, the front and rear propulsion pipe end faces come into contact with each other via a cushion material, Due to the formation of the notch on the inside, the pipe end faces do not come into contact with each other.

[0011]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a front view for explaining the tapered cut propulsion pipe of the pipe end face of the present invention. At the rear end face of the propulsion pipe 1, a notch 3 is provided, which is gradually inclined toward the outside of the pipe at a symmetrical position in a range substantially equally divided into four parts in the circumferential direction. Further, the cushion member 2 is provided at a vertically symmetrical position in a range substantially equally divided into four in the circumferential direction of the rear end face of the propulsion pipe 1. The cushioning material 2 may be made of any material that can be plastically deformed even in a curved section and transmit the propulsion force efficiently over a wide range, and low foam polystyrene or the like is used. The thickness of the notch 3 is notched so that the pipe end face does not come into contact with the inside of the curve of the joint portion of the propulsion pipe 1 in consideration of the radius of the curved line and the thickness and material of the cushioning material 2.

In the present embodiment, the curve is formed in the horizontal direction. In order to easily follow the tunnel hole formed by the excavator, the cushioning material 2 is provided only on the upper and lower portions of the end face of the propulsion pipe 1. By making the left and right end faces free, it is easy to form the left and right bent angles, and by providing the cutouts 3 on the left and right end faces, the contact of the pipe end faces is eliminated. Further, in the case of forming a curve in the vertical direction, cushion materials 2 are provided on the left and right portions of the end face of the propulsion pipe 1 to facilitate formation of a vertical bending angle. Further, the notch portions 3 are provided on both the left and right sides of the propulsion pipe 1. However, when the propulsion work is performed on a single curve on either the left or right side, it is only necessary to cut off one end face inside the curve.

FIG. 2 is a plan view illustrating a bending state of the propulsion pipe joint in a curved section. Cushioning material 2 is installed above and below the joint of the propulsion pipe 1 to form a bend angle that matches the planned curve. The rear end face of the forward propulsion pipe 1 inside the curve and the front end face of the rear propulsion pipe 1 usually try to contact each other due to the bend formed at the joint. By providing a notch in the contact, contact is prevented.

By providing the notch 3 in the joint portion of the propulsion pipe 1 at the symmetrical position in the vertical and horizontal directions according to the conditions for forming the curve, the thrust is reliably transmitted over a wide range by the cushioning material. The inside and outside of the curve are free, and the excavator's ability to follow the tunnel hole created is improved.

[0015]

[Effect of the invention]

 As described above, with the tapered cut propulsion pipe at the pipe end face of the present invention, the notch is provided by gradually making a gradient gradually toward the outside of the pipe at the vertically symmetric position or the left-right symmetric position of the end face of the propulsion pipe. Also, unlike the conventional case, the propulsion force is not concentrated only on a part of the inside of the pipe end face, but can be transmitted efficiently at the upper and lower or left and right cushion material installation portions, so that the pipe end face does not crack or break.

[0016]

[Brief description of the drawings]

FIG. 1 is a front view illustrating a tapered cut propulsion pipe of a pipe end face according to the present invention.

FIG. 2 is a plan view illustrating a bending state of a propulsion pipe joint in a curved section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Cushion material 3 Notch 4 Steel collar 5 Adjustment bracket

Claims (1)

[Utility model registration claims] 1. A concrete propulsion pipe used in a curved propulsion method, wherein a notch is provided by gradually inclining the end face of the propulsion pipe toward the outside of the pipe at a symmetrical position or a vertically symmetrical position. A cushioning material is fixed to a vertically symmetrical position or a left-right symmetrical position where no part is provided.