JP2001280072A - Propulsion pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propulsion pipe having the bending strength and external pressure strength larger than those of the conventional propulsion pipe using a Hume pipe and capable of preventing its damage at installation. SOLUTION: Fixing seat end plates 2 and 2 are provided at both ends of a concrete pipe body 1, a proper number of PC steel bars (steel bars for prestressed concrete) 3 fitted to the fixing seat end plates 2 and 2 at both ends are provided in the axial direction to apply prestress in the axial direction of the pipe body, and the pipe body is cured in an autoclave.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion pipe used when laying a pipe used as a sheath of an electric wire, a gas pipe, and a water pipe by the propulsion method. It is.

[0002]

2. Description of the Related Art Conventionally, a propulsion pipe used for a propulsion method is:
“Reinforced concrete pipe for sewer propulsion method” standardized by the Japan Sewerage Association is used.

[0003] This propulsion pipe is usually manufactured in a fume pipe factory, and the propulsion pipe has an outlet for a plug-in joint,
A receptacle is provided at the end. The inner surface of the propulsion pipe is finished with a spatula, brush, or the like at the time of manufacture so as not to hinder the flow of sewage. Therefore, no protrusion can be produced inside the tube.

Since this propulsion pipe is manufactured at a fume pipe factory, the effective length of the product is limited to less than 2.5 m. The external pressure strength of the propulsion pipe is reinforced by the chemical prestress of reinforcing steel and expanded concrete, but the management of expanded concrete is very difficult.

Although it is possible to use a half-pipe having a half effective length to reduce the bending moment generated in the pipe body and prevent breakage due to bending, it is rarely designed and constructed for that purpose.

For this reason, in actual construction, the pipe may be broken due to meandering during the propulsion, changes in the ground, deformation of the cutting edge, pressing by a boulder, and the like.

The use of the propulsion pipe is primarily for sewerage, but there are many uses as a sheath pipe for electric wires, gas, water supply and the like. When used as a sewer, the accuracy of the inner surface and inner diameter is required, but when used as a sheath, the accuracy of the inner surface and inner diameter is not required. And when it is used as a sheath pipe, a work of providing facilities such as a pipe and an invert inside the pipe after the construction is performed. In any case, the concentrated load of the propulsion force at the time of propulsion may cause loss of the pipe end and cracks on the inner surface.

[0008]

SUMMARY OF THE INVENTION A first object of the present invention is to prevent damage to the propulsion pipe during construction because the bending strength and the external pressure strength are greater than those of conventional propulsion pipes using fume pipes. The second challenge is to provide what can be done.
An object of the present invention is to provide a facility for facilitating facility work inside a pipe after completion of a propulsion pipe laying work.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems.
An end plate for a fixing seat is provided at both ends of a concrete tube, and an appropriate number of PC steel rods having both ends fixed to the end plate for the fixing seat are provided in the axial direction to apply prestress in the axial direction of the tube. ,
A propulsion pipe characterized by being autoclaved.

[0010] The invention according to claim 2 further includes a propulsion pipe for facilitating work after installation of the propulsion pipe by integrally forming a pipe, a wiring mounting facility, a jig or an invert inside the concrete pipe. is there.

Prestress is introduced into the propulsion pipe body by arranging a PC steel rod in the axial direction of the concrete pipe constituting the propulsion pipe, applying tension, and fixing the steel pipe with an end plate. The introduction of the prestress reinforces the bending strength and external pressure strength of the propulsion pipe. In addition, the end of the pipe is reinforced by the end plate that is set to fix the PC steel bar and introduce prestress, and these works are performed by a pile factory that manufactures piles by centrifugal molding. It is possible.

The effective length of the propulsion pipe is doubled, tripled, and reduced to four times that of the conventional standard by forming the propulsion pipe using a mold used for manufacturing a concrete pile instead of the conventional fume pipe form. It can be doubled, which is possible in pile factories that manufacture concrete piles by centrifugal molding.

[0013] Inside the formwork of the propulsion tube formed by centrifugal molding,
A band or steel pipe to which shelves or bolts for pipe installation are fixed in advance is set, and then concrete is cast and a propulsion pipe is formed by centrifugal molding. The inner surface of the propulsion tube does not have a spatula or brush finish like a conventional fume tube. And a sheath tube that can be used without any problem is obtained. If the entire surface is wound with a steel pipe, the external pressure strength and the bending strength are reinforced. These means can also be manufactured by a conventional fume pipe factory manufacturing line.

[0014]

[Function] Since the prestress is introduced in the axial direction of the pipe, the bending strength and the external pressure strength of the propulsion pipe are increased, and trouble during propulsion can be prevented. If used as a sheath tube, after the inner surface of the tube is centrifugally molded, washed with water, the soft inner surface and the mortar layer are removed by air, and the finish is enough to remove the mortar layer.
It is a countermeasure to prevent corner cracks caused by stress concentration during propulsion and cracks on the inner surface of the pipe generated from the end face. Since the length can be doubled, tripled, or quadrupled as compared with a conventional propulsion pipe, the trouble of replacing pipes during construction can be omitted, and the construction speed can be increased.

According to the second aspect of the present invention, since piping equipment or a part thereof is set in advance on a propulsion pipe to be used as a sheath pipe, equipment work inside the narrow pipe after completion of the propulsion work is not required. Become useless. In addition, if it is formed of piping equipment or a steel band with a part of it set, especially a steel pipe winding that covers the entire concrete part, the external pressure strength and bending strength of the propulsion pipe will be greatly strengthened. Become.

[0016]

FIG. 1 is a sectional view of an embodiment according to the first invention, wherein 1 is a concrete tube formed by centrifugal molding, and 2 and 2 are at both ends of the concrete tube 1. With the end plate for fixing seat provided, bulging portions 3a provided at both ends of a PC steel rod 3 embedded in the concrete pipe 1 are engaged with the stop holes 2a. As shown in FIGS. 3 and 4, the fixing seat end plate 2 is provided with a screw hole 2b for fixing to the mold, and this screw hole communicates with the stop hole 2a.

1a is an inlet formed at the end of the tube 1, 1
b is a receptacle made of an embedded collar provided at the opposite end,
It is to be fitted with a socket or an outlet of a concrete pipe to be cascaded, and the effective length of the pipe is 2.5 m to 10 m, and the inner diameter is, for example, the same as that of a fume pipe. 6 m to 3.0 m.

The concrete pipe constructed as described above is prestressed in the axial direction by the PC steel rod 3 to reinforce the bending strength and the external pressure strength, and the concrete pipe is subjected to autoclave curing to cure the concrete. 900 kg / cm ^{2 having} a compressive strength much larger than that of the conventional fume tube is obtained. In order to further increase the strength, it is of course possible to use a high-strength admixture or use a high-strength iron wire as a spiral bar as other means.

Also, since the steel end plates 2 and 2 are provided at the end of the pipe, the end of the pipe can be reinforced and the propulsion stress can be dispersed. It has the effect of eliminating defects.

FIG. 5 shows an embodiment of the second aspect of the present invention.
In centrifugal molding, a mold provided with pipes and wiring installation equipment 5 such as a support tool and a bar 6 for forming an invert, as shown in FIG. The equipment 5 is used as a support, and the bar 6 is a mark of the upper surface position of the concrete to be poured into the invert part 7 or a pier receiver in that it is fixed to a frame (not shown) and centrifugally molded integrally with the concrete pipe 1. Is used.

Instead of using the short pipe 4, a long steel pipe partly used as the embedding collar 1b may be used. In this case, the bending and compressive strength can be enhanced, and therefore the PC steel rod can be used. 3 can be used less.

The propulsion pipe according to the present invention configured as described above can facilitate the installation of the pipes, inverts and the like after the installation of the propulsion pipes, and has the effect of shortening the number of days required for the installation.

When implementing the propulsion method, these facilities 5
However, in the case where the inner diameter of the pipe is small and it becomes an obstacle when discharging the discharged soil, a mounting jig such as a bolt which does not interfere may be used.

[0024]

According to the first aspect of the present invention, it is possible to provide a propulsion pipe having a larger bending strength and an outer pressure strength than a conventional propulsion pipe and capable of preventing damage to the propulsion pipe during construction. According to the second aspect of the present invention, there is an effect that facility construction inside the pipe after the installation of the propulsion pipe is facilitated, and the cost can be reduced as compared with the case where the fume pipe is used as the sheath pipe.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the first invention.

FIG. 2 is an enlarged sectional view of an end portion of FIG. 1;

FIG. 3 is an enlarged end view of an end plate.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a side view of the embodiment of the second invention.

FIG. 6 is an enlarged sectional view taken along line BB of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete pipe 1a Insert 1b Reception port 2 End plate for anchor seat 2a Lock hole 2b Screw hole 3 PC steel rod 3a Swelling part 4 Steel short pipe 5 Equipment 6 Bar 7 Invert part

Claims (2)

[Claims] A concrete pipe end plate is provided at both ends of a concrete pipe body, and an appropriate number of P end plates are fixed at both ends to the end plate for the fixing seat.
A propulsion pipe characterized in that a C steel rod is provided in the axial direction to apply prestress in the axial direction of the pipe body and is autoclaved. 2. The propulsion pipe according to claim 1, wherein a pipe or wiring installation equipment or an invert is integrally formed inside the concrete pipe.