JP2001153263A - Propulsive pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propulsive pipe which is resistible to an flexural effect caused by meanderings during propulsion and curved propulsion, and to an external pressure strength caused by a high earth pressure or the like produced by covering with thick earth after execution of propulsion, and also can cope with an earthquake. SOLUTION: An outer periphery of an approximately central portion 11 in the axial direction of the propulsive pipe is covered integrally with a cylindrical reinforcing pipe 21 with a large width and an almost half of the entire length of the propulsive pipe to thereby cope with flexural strength to the central portion 11 of the propulsive pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion pipe capable of coping with bending strength at the center of the pipe, a propulsion pipe capable of coping with external pressure strength, and the like.

[0002]

2. Description of the Related Art Conventionally, a method for reinforcing a propulsion pipe by covering the entire outer shell with a steel pipe is already known as described in Japanese Utility Model Publication No. 2-3028. This may be used as a propulsion pipe used when a large bending action acts on the pipe even if a slight bend occurs when propelling the gravel layer, a pipe that withstands the earth pressure due to a large earth cover, and a seismic force in hard ground . Also,
The fume pipe of the propulsion pipe used in a high earth covering area with a large earth covering is formed in a special thickness pipe so as to correspond to the high earth covering place.

[0003]

However, the conventional technique has the following problems. 1) Covering the entire outer circumference of the pipe with steel pipe requires a great deal of labor because a single steel plate corresponding to the length of one propulsion pipe and the outer circumference of the pipe is machined into a cylindrical shape by a machine such as a bending roll. I need it. Furthermore, in order to process a single large steel sheet,
There is a problem that the cost increases. 2) When steel is used for permanent structures underground, the thickness of the steel shall be set to allow for corrosion of the steel. The corrosion allowance for steel materials is 2 mm, assuming that it will normally be used for 100 years. Therefore, when a steel material is used in consideration of economy, the minimum thickness is generally set to 4.5 mm from the marketability of the steel material. In this case, the difference in strength due to the presence or absence of the steel material becomes too large (when reinforcing a propulsion pipe having a nominal thickness of 1000 with a steel material thickness of 4.5 mm, the reinforcement increases the strength three to four times by reinforcement). There is a problem in that a tube having excessive strength must be used even when a tube having high strength is sufficient. 3) For external pressure B-type pipes and external pressure C-type pipes, the wall thickness specified by JIS cannot be used in places with high earth cover, and extra thick pipes with particularly thick pipes are manufactured to cope with high earth cover. I was However, in order to manufacture extra-heavy tubes, a formwork corresponding to the thickness is required, which not only costs money,
There is a problem that the equipment must be changed because the weight of the pipe increases. In order to solve the above problems, the present invention has a strong resistance to meandering during propulsion and bending due to curved propulsion, a strong external pressure strength due to a high earth pressure generated by a high earth cover after construction, and a seismic resistance. The aim is to provide a propulsion pipe that can respond to the problems.

[0004]

According to a first aspect of the present invention, there is provided a propulsion pipe having a cylindrical shape having a substantially central portion in the axial direction of the pipe, the outer circumference of which is approximately half the entire length of the pipe. It is characterized in that it is integrally coated with a wide reinforcing pipe so as to be able to cope with the bending strength with respect to the central part of the pipe. Claim 2
In the propulsion pipe according to the invention described in (1), a plurality of cylindrical reinforcing pipes each having a narrow width in a form in which the entire pipe length is divided into a plurality of pieces are integrally coated at substantially equal intervals on the outer circumference in the pipe axis direction, and the external pressure strength on the pipes It is characterized by being formed so as to be able to cope with. In the propulsion pipe according to the third aspect of the present invention, the outer periphery of a substantially central portion in the pipe axis direction is
Along with a cylindrical and wide reinforcing pipe of about half the length of the pipe, it is integrally covered with a wide and narrow reinforcing pipe. And is formed to be able to cope with the external pressure strength. According to a fourth aspect of the present invention, in the first aspect, the second aspect, or the third aspect, the reinforcing pipe is a cylindrical steel pipe. The reinforcing pipe according to claim 1 or 2 or 3 of the propulsion pipe according to claim 5 is a pipe formed in a cylindrical shape from a carbon fiber reinforced plastic material having high tensile strength. Features.

[0005]

[Function] In the case of the propulsion pipe corresponding to the bending strength of the pipe, it is possible to cope with the bending strength with respect to the center of the pipe because it is integrally coated with a cylindrical reinforcing pipe of about half the length of the pipe. (See Figure 1). Even in the case of high earth covering as shown in FIG. 16, as shown in FIGS. 2 to 4, a narrow cylindrical reinforcing pipe in a form in which the entire length of the pipe is divided into a plurality of pieces on the outer circumference in the pipe axis direction is substantially uniformly spaced. , Which are resistant to meandering during propulsion and bending due to curved propulsion, and high external pressure due to high earth pressure caused by high overburden after construction. Strong,
Can respond to earth pressure during an earthquake. Further, as shown in FIGS. 5 and 6, the outer periphery at the substantially central portion in the pipe axis direction is integrally covered with a cylindrical and wide reinforcing pipe having a length of about half of the entire length of the pipe, and widths are provided at both ends in the longitudinal direction. The propulsion pipe, which is integrally covered with a narrow cylindrical reinforcing pipe, can respond to the bending strength and external pressure strength of the pipe against the center of the pipe, meandering during propulsion,
Strong against bending action due to curved propulsion, strong against external pressure due to high earth pressure generated by high earth covering after construction,
Furthermore, it can respond to earth pressure during an earthquake.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIGS.
5 will be described. The present invention is applied to a propulsion pipe such as a general external pressure pipe (fume pipe) as shown in FIGS. 17 and 18, and a propulsion fume pipe as shown in FIG. Tubes 11, 12,
Reinforcing pipes 21 and 31 are arranged on the outer periphery of 13 at positions corresponding to the strength according to the purpose such as whether the strength corresponds to the bending strength or the strength of the external pressure. That is, as shown in FIG.
The tube is integrally covered with a cylindrical reinforcing tube 21 having a length of about half of the entire length of the tube so as to be able to cope with bending strength with respect to the center of the tube. Also, as shown in FIGS. 2, 3, and 4,
A plurality of narrow cylindrical reinforcing pipes 31 in a form in which the entire length of the pipe is divided into a plurality of pieces are arranged at substantially equal intervals and integrally covered,
It is made possible to cope with the external pressure intensity on the pipe. further,
As shown in FIG. 5 and FIG. 6, the outer periphery of the tube portion
A cylindrical and wide reinforcing pipe 21 having a length of about half of the entire length of the pipe.
In a propulsion pipe integrally covered with a pipe and integrally covered with a narrow cylindrical reinforcing pipe 31 at both ends in the longitudinal direction, it is possible to cope with bending strength and external pressure strength of the pipe with respect to the center of the pipe, and meandering during propulsion In addition, it is strong against bending action due to curved propulsion, strong against external pressure due to high earth pressure generated by high earth covering after construction, and capable of responding to earth pressure during an earthquake. The reinforcing pipes 21 and 31 may be cylindrical steel pipes 22 or cylindrical pipes 32 made of carbon fiber reinforced plastics and having a high tensile strength. Further, the cylindrical steel pipe 22 and the cylindrical pipe 32 formed of carbon fiber reinforced plastics may be appropriately combined and arranged. In the case of the steel pipe 22, a steel sheet having a thickness of about 4.5 mm to 9 mm is cut into a width according to the purpose, then processed into a cylindrical shape with a machine such as a bending roll, fixed in a formwork, and fixed to a propulsion pipe. Produce 11, 12, 13. In addition, thickness 4.5
It is manufactured by cutting a cylindrical carbon fiber reinforced plastic material of about 9 mm to 9 mm into a width according to the purpose, processing it into a cylindrical shape, and fixing it in a mold. The pipe 32 made of the carbon fiber reinforced plastics material may have a tensile strength of about 1/2 of the steel pipe 22.

[0007]

Since the present invention is configured as described above, the following effects can be obtained. (1) In the case of a propulsion pipe corresponding to the bending strength of the pipe, a cylindrical reinforcing pipe with a length of about half of the pipe length is arranged at the center of the pipe on the outer circumference of the pipe, so it is possible to respond to the bending strength for the center of the pipe .
Therefore, since the bending strength of the propulsion tube is improved, it is possible to prevent the body from being broken, broken, broken, or the like. Further, a propulsion pipe having excellent bending strength can be manufactured economically. (2) In order to cope with high earth cover, a plurality of narrow cylindrical reinforcing pipes are arranged at almost equal intervals in the longitudinal direction of the pipe to increase the wall thickness of the pipe, It is no longer necessary to cover the entire outer circumference with steel pipes, it is resistant to meandering during propulsion and bending due to curved propulsion, strong against external pressure due to high earth pressure generated by high earth cover after construction, and furthermore, earthquake It can cope with high earth pressure that sometimes occurs. (3) The outer periphery of the center part in the pipe axis direction is integrally covered with a cylindrical and wide reinforcing pipe having a length of about half of the entire length of the pipe, and narrow cylindrical reinforcing pipes are provided at both ends in the longitudinal direction. With the integrally coated propulsion pipe, it is possible to respond to the bending strength and external pressure strength of the pipe at the center of the pipe, meandering during propulsion,
Strong against bending action due to curved propulsion, strong against external pressure due to high earth pressure generated by high earth covering after construction,
Furthermore, it can respond to earth pressure during an earthquake. (4) Reinforcement pipes do not process a single large steel sheet that covers the entire pipe, but process half the length of the pipe in the longitudinal direction or a reinforcement pipe with a width smaller than that. is there.
Further, in the case of using the tube 3 formed of a carbon fiber reinforced plastics material in a cylindrical shape, the tube 3 can be manufactured to be lightweight and can cope with the tensile strength. (5) Also, when manufacturing a reinforcing pipe from a single steel sheet, it is heavy and it takes considerable effort to transport and set it in the formwork by hand, but the reinforcing pipe of the present invention requires Since a narrow reinforcing pipe is used, it is lightweight, so that the setting work on the formwork can be easily performed with little labor.

[Brief description of the drawings]

FIG. 1 is a front view of a propulsion fume tube corresponding to a bending strength with respect to a center portion of the tube according to the present invention.

FIG. 2 is a front view of a propulsion fume tube corresponding to the external pressure strength of the present invention.

FIG. 3 is a front view of an external pressure B-shaped tube corresponding to the external pressure strength of the present invention.

FIG. 4 is a front view of an external pressure C-shaped tube corresponding to the external pressure strength of the present invention.

FIG. 5 is a front view of an external pressure B-shaped pipe corresponding to a bending strength with respect to a pipe central portion of the present invention.

FIG. 6 is a front view of an external pressure C-shaped pipe corresponding to a bending strength with respect to a pipe center portion of the present invention.

FIG. 7 is a partially enlarged longitudinal cross-sectional view of the center of the propulsion fume tube corresponding to the bending strength of the center portion of the tube according to the present invention.

FIG. 8 is a partially enlarged vertical cross-sectional view of the center of the propulsion fume tube corresponding to the external pressure strength of the present invention.

FIG. 9 is an enlarged cross-sectional view of the central portion of the external pressure B-shaped pipe corresponding to the external pressure strength of the present invention.

FIG. 10 is an enlarged cross-sectional view of a central vertical part of an external pressure C-shaped tube corresponding to the external pressure strength of the present invention.

FIG. 11 is an enlarged cross-sectional view of a central portion of an external pressure B-shaped tube corresponding to a bending strength with respect to a center portion of the tube of the present invention.

FIG. 12 is a partially enlarged vertical cross-sectional view of a central portion of an external pressure C-shaped tube corresponding to a bending strength with respect to a central portion of the tube of the present invention.

FIG. 13 is a perspective view of a reinforcing pipe of the present invention.

FIG. 14 is a perspective view of a reinforcing pipe of the present invention.

FIG. 15 is a view showing a state where a steel sheet is formed by a machine such as a bending roll.

FIG. 16 is a state diagram of a place where earth pressure is working at a place of high earth covering.

FIG. 17 is a front view of a conventional external pressure B-type tube.

FIG. 18 is a front view of a conventional external pressure C-shaped tube.

FIG. 19 is a front view of a propulsion fume tube according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 11 Central part 12 External pressure B type pipe 13 External pressure C type pipe 2 Reinforcement pipe 21 Wide reinforcement pipe 22 Steel pipe 3 Narrow reinforcement pipe 31 Carbon fiber reinforced plastics pipe

Claims (5)

[Claims] 1. An outer periphery of a substantially central portion in a pipe axial direction is integrally covered with a cylindrical and wide reinforcing pipe having a length of about half of the entire length of the pipe, and formed so as to be able to cope with a bending strength with respect to the central part of the pipe. Characterized by a propulsion tube. 2. A plurality of narrow cylindrical reinforcing pipes each having a total length divided into a plurality of sections are integrally coated at substantially equal intervals on the outer circumference in the pipe axis direction so as to be able to cope with the external pressure strength of the pipes. A propulsion pipe characterized by being formed. 3. An outer periphery of a substantially central portion in the axial direction of the pipe is integrally covered with a cylindrical and wide reinforcing pipe having a length of about half of the entire length of the pipe, and a narrow cylindrical reinforcement is provided at both ends in the longitudinal direction. A propulsion pipe comprising a pipe integrally coated and formed so as to be able to cope with a bending strength and an external pressure strength with respect to a pipe central portion with respect to the pipe. 4. The propulsion pipe according to claim 1, wherein the reinforcement pipe is a cylindrical steel pipe. 5. The propulsion according to claim 1, wherein the reinforcing pipe is a pipe formed of a carbon fiber reinforced plastic material having a high tensile strength and having a cylindrical shape. tube.