JP2000035169A - Flexible jacking pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart required rigidity necessary for jacking force transmission to a jacking pipe having a flexible part. SOLUTION: Facing end surfaces of a driving force receiver ring 7 respectively integrally provided on each of steel-made rings 5 are mutually mated with each other and a grout material 22 is filled between the jacking force receiver ring 7 and an elastic ring 11 on a flexible jacking pipe dividing a concrete part 4 and the steel-made rings 5 on its outer periphery into two at an intermediate part in the lengthy direction and provided with a flexible part between the divided concrete parts 4.

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 in a propulsion method, and more particularly to a flexible propulsion pipe.

[0002]

2. Description of the Related Art When an underground pipe is constructed with a fume pipe, a fume pipe having a flexible portion at a middle portion in a longitudinal direction is conventionally provided in order to freely deform and follow vibrations such as ground deformation and earthquake. It is known to use As such a flexible fume tube, the present applicant has previously filed Japanese Patent Application No.
A patent application has been filed under US Pat. No. 3,303,680 (Japanese Patent Application Laid-Open No. 9-119573).

[0003] The fume pipe according to the above-mentioned patent application follows ground fluctuations and the like with the required flexibility and has the required rigidity, so that a long-term stable underground pipe can be constructed.

On the other hand, a propulsion method is used when constructing the underground pipe as described above, and the propulsion pipe used for the method is generally a fume pipe.

[0005]

As is well known, in the propulsion method, a propulsion pipe is sequentially added from the starting hole to the rear end of the excavator, and a required thrust is applied to the rear end of the propulsion pipe to connect the excavator and the propulsion. The tube is advanced. For this reason, each propulsion pipe is required to have sufficient rigidity to transmit its thrust forward.

As a propulsion pipe of such a propulsion method, the flexible fume pipe as described above is effective when the propulsion distance is relatively short, but it is not sufficiently satisfactory as the propulsion length increases. there were.

Accordingly, an object of the present invention is to provide a flexible propulsion tube having required flexibility and sufficient rigidity to transmit thrust.

[0008]

In order to solve the above-mentioned problems, the present invention divides a concrete portion of a propulsion pipe body and a steel ring integrated on an outer peripheral surface of the concrete portion into two in a longitudinal direction. A flexible propulsion pipe comprising an elastic ring interposed between opposed end faces of the bisected concrete portion and having both ends of the elastic ring connected to the steel rings, respectively. A thrust receiving ring is provided integrally with each of the ring made, the opposing end faces of the thrust receiving rings are abutted with each other, and a grout material is filled between the thrust receiving ring and the elastic ring.

An outward elastic flange is provided at both ends of the elastic ring, an inward steel flange is provided on an inner peripheral surface of the steel ring, and the steel flange is applied to the inside of the elastic flange. A pressing ring is applied to the outside of the elastic flange, the thrust receiving ring is integrated with the steel flange, and the opposing end faces of the inner circumferential thrust receiving rings provided integrally with the pressing rings are abutted against each other. A configuration in which a thrust transmitting ring body is interposed between the steel flange and the holding ring, and the elastic flange is sandwiched and fixed between the steel flange and the holding ring can be adopted.

The thrust transmitting ring may be fixed to either the steel flange or the holding ring.

Further, in order to solve the above-mentioned problems, a concrete portion of the propulsion pipe main body and a steel ring integrated with the outer peripheral surface of the concrete portion are each bisected in a longitudinal direction, and the bisected concrete portion is provided. An elastic ring is interposed between the opposed end faces of the flexible propulsion pipe, and both ends of the elastic ring are connected to the respective steel rings. At the required intervals, a steel flange is provided on the inner peripheral surface of each steel ring, and both ends are fixed to each steel flange with the elastic ring interposed on the opposite surface of each steel flange. On the inner peripheral side of the elastic ring, an inner peripheral thrust receiving ring is integrally provided on the opposing surface of each of the steel flanges, and opposing end surfaces of the inner peripheral thrust receiving rings are abutted with each other. It can be the structure filled with grout to a surrounded by the respective steel flanges of the space.

[0012] It is possible to adopt a configuration in which an extension margin portion bent outward is provided at an intermediate portion in the length direction of the elastic ring. Further, a configuration in which the above-described inner peripheral thrust receiving rings are integrally provided on the facing surface of each of the above-mentioned steel flanges, and a configuration in which the above-mentioned respective thrust receiving rings are integrally provided on the inner peripheral surface of each of the above-mentioned steel rings. I can take it.

A structure in which a stainless steel ring extending over the concrete portion on both sides of the inner circumferential thrust receiving ring is integrally provided on the inner circumferential surface of the inner circumferential thrust receiving ring. A configuration in which a reinforcing steel plate is detachably attached can be adopted.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The flexible propulsion pipe of the first embodiment shown in FIGS. 1 and 2 is constituted by a fume pipe.
A flexible portion 2 is provided at an intermediate portion in the length direction of the propulsion pipe main body 1. The propulsion pipe main body 1 has a concrete part 4 reinforced by a reinforcing cage 3 which is bisected at a required interval in the length direction.
The flexible portion 2 is provided between the divided concrete portions 4.
Is provided.

The flexible portions 2 of the concrete portions 4 on both sides described above.
Each of the steel rings 5 is provided from the outer peripheral surface close to the outer peripheral surface of the flexible portion 2, and opposing end surfaces of the steel rings 5 on both sides abut against the flexible portion 2 in the middle. An inwardly directed steel flange 6 is provided on the inner peripheral surface of each steel ring 5, and a thrust receiving ring 7 is integrally provided on the inner peripheral surface of each steel ring 5 and the inner surface of the steel flange 6 by welding. Can be

Each thrust receiving ring 7 has a thrust transmitting direction,
That is, the plate thickness is selected so as to have a required strength in the length direction, and their opposite end faces are butted at the same position as the butted position of the steel ring 5.

A required number of fixing bolts 8 are inserted through the steel flanges 6 from the inner surface side, and the bolt heads 9 are fixed to the steel flanges 6 by welding.

The steel ring 5 is provided with a circumferentially inward rib 10 (see FIG. 1), thereby reinforcing the steel ring 5 and firmly integrating it with the concrete part 4. I have to.

The elastic ring 11 which is a central component of the flexible portion 2 is made of rubber, and has elastic flanges 12 facing outward at both ends.
Is provided, and an extension margin portion 13 bent outward and bent in an inverted U-shape is provided at an intermediate portion thereof. The steel flange 6 is provided on the inner surface of the elastic flange 12 with the sealing member 1.
4 and the fixing bolt 8 is inserted. The inner diameter of the elastic ring 11 is slightly larger than the inner diameter of the concrete part 4. The seal member 14 is a rubber to which a liquid prepolymer is added as a curing agent using, for example, a hydroxyl group-terminated liquid polybutadiene, and has excellent water resistance and elastic restoring force. Even when the flexible portion is bent due to fluctuation of the ground, It is possible to reliably maintain the water stoppage.

Pressing rings 15 are applied to the outer surfaces of the respective elastic flanges 12. Holding ring 15
Has a width extending from the inner peripheral portion to the outer peripheral portion of the concrete portion 4, and an inner peripheral thrust receiving ring 16 is integrally provided on the inner surface on the inner peripheral portion side on the inner diameter side with respect to the elastic ring 11. The thickness of the inner peripheral thrust receiving ring 16 is also selected so as to have a required strength in the thrust transmitting direction, and their opposing end faces are at the same position as the butted position of the steel ring 5 and the thrust receiving ring 7. Are matched in.

Further, a thrust transmitting ring 17 is integrally provided on the inner surface on the outer peripheral side of the pressing ring 15, and the thrust transmitting ring 17 faces the outer surface of the steel flange 6. The fixing bolt 8 is also inserted into the holding ring 15, and the nut 18 is fastened to clamp and fix the elastic flange 12 between the steel flange 6 and the holding ring 15. With the elastic flange 12 clamped and fixed,
The thrust transmission ring 17 contacts the steel flange 6.

On the inner peripheral surfaces of the above-mentioned pressing ring 15 and inner peripheral thrust receiving ring 16, concrete portions 4, 4 on both sides thereof are provided.
Stainless steel ring 19 is provided integrally,
This protects the elastic ring 11 from the inside and prevents corrosion due to water flowing inside the propulsion tube.

An inlet 21 provided in the steel ring 5 and the thrust receiving ring 7 is provided in a space defined by the outer peripheral surface of the elastic ring 11 and both the steel rings 5 and both the steel flanges 6. The grout material 22 is injected and filled.
For example, an early-strength non-shrink mortar or the like is used as the grout material 22 so as to have rigidity, bear a part of thrust transmission, and also exhibit water stoppage.

In addition, reference numeral 23 in the figure denotes an anchor bar provided on the outer surface of the steel flange 6.

The propulsion tube according to the embodiment is as described above. When manufacturing the same, an assembly in which a thrust receiving ring 7 and a steel flange 6 are integrated with a steel ring 5 is manufactured in advance, and the steel The fixing bolt 8 is fixed to the flange 6 and the seal member 14 is attached. The steel ring 5 of the other assembly having the same structure and the thrust receiving ring 7 face each other. Next, the elastic flanges 12 of the elastic ring 11 are arranged along the outer surfaces of the steel flanges 6 on both sides, and the fixing bolt 8 is inserted into the bolt hole 25 of the elastic flange 12.

On the other hand, an assembly consisting of a stainless steel ring 19, a holding ring 15, an inner circumferential thrust receiving ring 16 and a thrust transmitting ring 17 is also manufactured in advance, and the holding ring 15 is arranged along the outer surface of the elastic flange 12 and Then, the fixing bolt 8 is inserted into the bolt hole 26 of the holding ring 15 and the nut 18 is fastened. At this time, the elastic flange 1
2 is kept in a predetermined compressed state. Thereafter, the grout material 22 is injected from the injection port 21 and cured to form a ring-shaped flexible portion assembly as a whole.

Reference numeral 32 denotes a water-stopping material for embedding, for example, a water-swellable rubber.

The above-mentioned flexible part assembly is set on a mold of a centrifugal molding machine, concrete is charged, and centrifugal force molding is performed as usual.

When the propulsion pipe manufactured as described above is used for the propulsion method, the thrust applied to the receiving port 27 (see FIG. 1) of the propulsion pipe main body 1 is applied to the outer periphery of the flexible portion 2 by the steel. Route from the butted end face of the ring 5 to the outlet 28 side, the holding ring 15, and the thrust transmission ring 1
7, the steel flange 6 and the thrust receiving ring 7 are transmitted by a route leading to the insertion port 28 through the butted end face.

In the inner peripheral portion of the flexible portion 2,
The thrust applied to the inlet 2 passes through the route extending from the butted end face of the stainless steel ring 19 to the inlet 28 side, the presser ring 15 and the inner circumferential thrust receiving ring 16 to the outlet 2.
It is transmitted by the route to the 8 side.

If the strength of thrust transmission is insufficient only by the routes on the outer peripheral side and the inner peripheral side described above, both rings 19 are attached to the inner peripheral surface of the stainless steel ring 19 as shown by the dashed line in FIG. Further, a required number of reinforcing steel plates 29 can be attached by bolts 30 and after the propulsion is completed, the bolts 30 can be removed and the reinforcing steel plates 29 can be removed.

It goes without saying that the nut 31 to be screwed into the bolt 30 is embedded in the concrete part 4.

In the underground pipe constructed by the propulsion pipe buried as described above, when a ground deformation or the like occurs, the concrete section 4 on the receiving port 27 side and the concrete section 4 on the insertion port 28 side become flexible sections 2. At the abutting surfaces of the steel ring 5, the thrust receiving ring 7, the inner circumferential thrust receiving ring 16, and the stainless steel ring 19, are displaced in the shearing direction or deformed in response to an external force such as a V-shape or an inverted V-shape. Further, the extension allowance portion 13 of the elastic ring 11 elastically deforms or expands in accordance with the above-described deformation, and maintains the seal between the ground and the inside of the pipe.

The above-described thrust transmission ring 17 is shown in FIG.
As shown in the above, the inner peripheral surface of the steel ring 5 and the outer surface of the steel flange 6 may be welded and integrated. Other configurations in FIG.
This is the same as in FIGS. 1 and 2.

In the first embodiment described above, the transmission of thrust is performed by both the route on the outer peripheral side and the route on the inner peripheral side, but only the route on the outer peripheral side is sufficient. When the thrust can be transmitted, the inner peripheral thrust receiving ring 16 may be omitted, and the inner peripheral assembly may be constituted only by the holding ring 15 and the stainless steel ring 19. On the contrary, the second embodiment (FIGS. 4 to 6) shows an embodiment in which thrust is transmitted only through the inner peripheral route.
The third embodiment (FIG. 7) and the fourth embodiment (FIG. 8) will be described below. In each of these embodiments, the thrust transmitting element on the outer peripheral side is omitted, and the configuration for increasing the thrust transmitting capability on the inner peripheral side is adopted.

That is, in the case of the second embodiment shown in FIGS. 4 to 6, the inner ends of the two steel rings 5, 5 are spaced apart from each other by a length L that is substantially the entire length of the flexible portion 2. And oppose each other,
Further, the aforementioned thrust receiving rings 7, 7 are omitted. And, the radial width of the steel flanges 6, 6 is formed to be substantially equal to the thickness of the concrete part 4,
The outer diameter surface is fixed to the inner diameter surfaces of the steel rings 5, 5 by welding. An elastic flange 12 of an elastic ring 11 is fixed to an intermediate portion between the steel flanges 6, 6 by fixing bolts 8 and nuts 18. An annular flange washer 33 is interposed between the fixing bolt 8 and the bolt head 9. The provision of the inverted U-shaped extension allowance 13 in the middle part of the elastic ring 11 is the same as in the case described above.

Inner peripheral thrust receiving rings 16 having a thickness reaching the inner periphery of the steel flanges 6 are welded to the opposing surfaces of the steel flanges 6, 6 inside the elastic ring 11. You. In this case, the thickness of the inner circumferential thrust receiving rings 16, 16 is set to a thickness having a strength capable of transmitting the entire thrust by itself.

A stainless steel ring 19 similar to that described above is provided on the inner circumferential surface of the inner circumferential thrust receiving rings 16, 16 and the inner circumferential surfaces of the steel flanges 6, 6 and the concrete portions 4 on both sides thereof. The flanges 6, 6 and the inner circumferential thrust receiving rings 16, 16 are integrally fixed by welding.

A plurality of reinforcing steel plates 29 are attached to the inner peripheral surface of the stainless steel ring 19 by bolts 30. The bolt 30 passes through the stainless steel ring 19 and is screwed into a nut 31 embedded in the concrete part 4. The reinforcing steel plate 29 is removed after the completion of the propulsion as in the case described above. However, in this case, the reinforcing steel plate 2
Reference numeral 9 has not only the function of reinforcement during propulsion but also the function of reinforcing the flexible portion 2 so that it does not bend when the flexible propulsion tube is manufactured and transported at a factory.

The grout material 22 is injected and filled into the space defined by the outer peripheral surface of the elastic ring 11 and both steel flanges 6, 6 as in the case described above. When injecting the grout material 22,
A pair of semi-annular injection straps 34 are mounted on the outer peripheral surface to close the gap L between the opposed ends of the two steel rings 5, 5. The parts 35 are fastened to each other with bolts 36 and are brought into close contact with the outer peripheral surfaces of the steel rings 5 and 5.

The injection metal band 34 is provided with an injection port 37 (see FIG. 6), through which the grout material 22 is injected. The pouring strap 34 is removed after curing.

Since the configuration of the flexible propulsion tube other than the above is the same as that of the above-described first embodiment, the same portions are denoted by the same reference numerals, and redundant description will be omitted.

The flexible propulsion tube configured as described above is
Like the first embodiment, the thrust is used in the propulsion method. In this case, the transmission of the thrust is performed exclusively by the inner circumferential thrust receiving rings 16 and 16, and the reinforcing steel plate 29 contributes to this.
Since there is no route for transmitting thrust on the outer peripheral side, if there is a shortage in thrust transmission, as shown by a dashed line in FIG. 5, reinforcement such as a reinforcing bar connecting both steel rings 5, 5 is performed. About four members 38 may be provided all around.

The flexible propulsion tube described above has an advantage that the structure is simple because the pressing ring 15 and the thrust transmitting ring 17 in the first embodiment can be omitted.

The flexible propulsion tube of the third embodiment shown in FIG. 7 corresponds to a modification of the above-described second embodiment, and is basically the same as the second embodiment. The major difference is that the width of the steel flange 6 is formed from the inner circumferential surface of the steel ring 5 to the size of the inner circumferential surface of the elastic ring 11, and the length of each inner circumferential thrust receiving ring 16 is smaller. This is a point formed from the abutting end surfaces so as to reach the concrete portion 4 beyond the steel flange 6. The inner peripheral thrust receiving ring 16 is fixedly integrated with the inner peripheral surface of the steel flange 6 by welding.

A stainless steel ring 19 is integrally provided on the inner peripheral surface of the inner peripheral thrust receiving ring 16 by welding, and a plurality of reinforcing steel plates 29 are further bolted on the inner peripheral surface.
It is the same as in each of the above-described embodiments in that it is detachably attached. However, the nut 31 in this case penetrates the hole 40 of the inner peripheral thrust receiving ring 16 and is welded to the inner peripheral thrust receiving ring 16 by welding when it comes out to the concrete portion 4. Other configurations are the same as those of the second embodiment.

The fourth embodiment shown in FIG.
The fixing structure of the bolt 30 of the embodiment is partially changed. That is, the bolt 30 in this case is directly screwed into the screw hole 39 of the inner circumferential thrust receiving ring 16. Other configurations are the same as those of the third embodiment.

The stainless steel ring 19 is integrated with the inner peripheral surface of the inner peripheral thrust receiving ring 16 by welding.

In each of the third and fourth embodiments, since the inner peripheral thrust receiving ring 16 largely digs into the concrete portion 4 and is integrated with the concrete portion 4, the thrust applied to the concrete portion 4 is reduced. It can be transmitted stably.

[0051]

As described above, the propulsion pipe of the present invention has the required flexibility and can transmit thrust with sufficient rigidity when used in the propulsion method. In particular, by providing the thrust receiving rings at two locations on the outer peripheral side and the inner peripheral side of the flexible portion, a large thrust can be distributed and transmitted over two routes. In addition, by providing the elastic ring with an outwardly extending allowance, greater flexibility can be exhibited.

The thrust transmitting ring not only functions as an intermediary for transmitting thrust, but also has a function of preventing a certain or more compressive force from being applied to the elastic flange during propulsion, thereby protecting the elastic ring. Has the effect of doing

Further, when the thrust is transmitted only on the inner peripheral side, there is an advantage that the structure of the flexible portion is simplified. Also, by increasing the thickness of the inner peripheral thrust receiving ring for transmitting the thrust or forming the inner peripheral thrust receiving ring long so as to bite into the concrete portion, a sufficiently large thrust can be transmitted only on the inner peripheral side.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment.

FIG. 2 is a partially enlarged sectional view of the above.

FIG. 3 is an enlarged sectional view of a modification of the above.

FIG. 4 is a front view of a second embodiment.

FIG. 5 is a partially enlarged sectional view of the above.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 4;

FIG. 7 is a partially enlarged cross-sectional view of the third embodiment.

FIG. 8 is a partially enlarged cross-sectional view of the fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe main body 2 Flexible part 3 Reinforcing cage 4 Concrete part 5 Steel ring 6 Steel flange 7 Thrust receiving ring 8 Fixing bolt 9 Bolt head 11 Elastic ring 12 Elastic flange 13 Extension room 14 Seal member 15 Pressing ring 16 Inside Circumferential thrust receiving ring 17 Thrust transmitting ring 18 Nut 19 Stainless steel ring 21 Injection port 22 Grout material 23 Anchor bar 25 Bolt hole 26 Bolt hole 27 Receptacle 28 Inlet 29 Reinforced steel plate 30 Bolt 31 Nut 32 Waterproof material for embedding 33 Flange washer 34 Injection metal band 35 Bending portion for connection 36 Bolt 37 Inlet 38 Reinforcement member 39 Screw hole 40 Hole

Claims (9)

[Claims] 1. A concrete portion of a main body of a propulsion pipe and a steel ring integrated with an outer peripheral surface of the concrete portion are each bisected in a longitudinal direction, and an elastic ring is provided between opposed end faces of the bisected concrete portion. In the flexible propulsion pipe in which both ends of the elastic ring are interposed and connected to the respective steel rings, a thrust receiving ring is provided integrally with each of the steel rings. A flexible propulsion pipe characterized in that opposing end faces of the flexible propulsion pipe are abutted with each other and a grout material is filled between the thrust receiving ring and the elastic ring. 2. An outward elastic flange is provided at both ends of the elastic ring, an inward steel flange is provided on an inner peripheral surface of the steel ring, and the steel flange is applied to the inside of the elastic flange. At the same time, a pressing ring is applied to the outside of the elastic flange, the thrust receiving ring is integrated with the steel flange, and the opposing end faces of the inner circumferential thrust receiving rings provided integrally with the pressing rings are abutted with each other. The thrust transmission ring body is interposed between the steel flange and the holding ring, and the elastic flange is sandwiched and fixed between the steel flange and the holding ring. Flexible propulsion tube. 3. The flexible propulsion pipe according to claim 2, wherein the thrust transmission ring is fixed to one of the steel flange and the holding ring. 4. A concrete portion of a propulsion pipe body and a steel ring integrated with an outer peripheral surface of the concrete portion are each bisected in a longitudinal direction, and an elastic ring is provided between opposed end faces of the bisected concrete portion. In the flexible propulsion pipe which is interposed and connects both ends of the elastic ring to the above-mentioned steel rings, a required space is provided between the opposite ends of the above-mentioned steel rings, and A steel flange is provided on the inner peripheral surface of the steel ring, and the elastic ring is interposed on the opposite surface of each of the steel flanges, and both ends thereof are fixed to each steel flange. On the side, the inner peripheral thrust receiving ring is provided integrally with each of the steel flanges, and the opposing end faces of the inner peripheral thrust receiving rings abut each other, and are surrounded by the outer peripheral surface of the elastic ring and each of the steel flanges. In space A flexible propulsion tube filled with a grout material. 5. The flexible propulsion tube according to claim 1, wherein an extension margin portion bent outward is provided at an intermediate portion in a length direction of the elastic ring. . 6. The flexible propulsion pipe according to claim 4, wherein each of said inner peripheral thrust receiving rings is integrally provided on a facing surface of each of said steel flanges. 7. The thrust receiving ring according to claim 4, wherein said thrust receiving ring is integrally provided on an inner peripheral surface of each of said steel rings.
Or the flexible propulsion tube according to 5. 8. An inner peripheral surface of the inner peripheral thrust receiving ring,
8. A stainless steel ring extending over said concrete portion on both sides thereof is provided integrally.
A flexible propulsion tube according to any one of the above. 9. The flexible propulsion tube according to claim 6, wherein a required number of reinforcing steel plates are detachably attached to the inner peripheral surface of the stainless steel ring.