JPH11280379A - Inside pushing pipe for pipe jacking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a gap between an inside pushing slide pipe and the fitting part thereof to increase the water-sealing force of a sealing member by fixing a reinforcing plate forming a sealing groove at the front end of an inside pushing pipe and putting the sealing member therein. SOLUTION: A concrete pipe is covered with a cylindrical reinforcing plate 13 at the outer periphery and a reinforcing ring 15 and an end plate 18 are welded at the front end, and a sealing member 19 is put in the sealing groove 16 of the reinforcing ring 15, in the inside pushing pipe 11. An inside pushing slide pipe 12 is provided with an insert mouth 24 connecting a standard jacking pipe at the front end and a cylindrical fitting part 23 is slidably inserted from the outside of the inside pushing pipe 11 to bring the inner peripheral face thereof to close contact with the sealing member 19. An inside thrusting jack 29 is equipped in between a flange 25 and the end plate 18 to advance the forward standard jacking pipe. Pressure water is ejected from an ejecting hole 22 for washing water when it is required to reject soil in the gap of the fitting part 23 and reduce the sliding resistance. Accordingly the sealing member 19 is put in the sealing groove 16 to reduce the gap in the fitting part 23 and increase the water-sealing force of the sealing member 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a midpipe for a propulsion method used when constructing a pipeline underground.

[0002]

2. Description of the Related Art The propulsion method is a method in which a propulsion pipe is successively added to the rear end of an excavator, and a main jack is installed at the rear end to apply a propulsive force to push a preceding propulsion pipe as the excavation progresses. Yes, it has been widely adopted.
Recently, the total length of the propulsion pipe is from several hundred meters to 100
It is approaching 0 meters. When the total length of the propulsion pipe becomes large in this way, the propulsion force becomes excessive and may exceed the strength of the propulsion pipe or the strength of the reaction wall in the start pit. The intermediate pushing method is used in which the intermediate pushing jack is divided and loaded and propelled.

As shown in FIG. 10, a conventional center-pushed tube used in the above-described center-push method is a center-pushed tube main body 1 generally called a center-pushed T-tube and a center-pushed S-tube. The middle push tube 2 is fitted to the outside of the front end of the middle push tube main body 1 and is slidable in the central axis direction.

[0004] Two annular seal members 3, 3 are provided on the outer peripheral surface of the above-mentioned center push tube main body 1 (see FIG. 11), and are closely attached to the inner circumferential surface of the center push slide tube 2. A lubricant injection hole 4 is provided between the two seal members 3. An intermediate push jack 6 is interposed between the front end of the intermediate push tube main body 1 and the inward flange 5 of the intermediate push slide tube 2. The above-mentioned middle push pipe is used between the standard propulsion pipes before and after the middle push pipe.

[0005] When the propulsion method is carried out using the above-described center push pipe while using the middle push pipe together, in order to reduce the propulsion resistance on the outer peripheral surface of the propulsion pipe, the standard push pipe and the inside of the center push pipe are used. A lubricant is injected into the outer peripheral surface of the propulsion pipe.

[0006]

The injection pressure of the above-mentioned lubricating material is generally set to a pressure obtained by adding 0.2 to 0.3 kgf / cm ² to the underground water pressure. The greater the depth, the larger. As a result, not only the groundwater pressure acting on the fitting portion between the center-pushed pipe main body 1 and the center-pushed slide pipe 2, but also the pressure of the sliding material increases, so that the middle-pushed pipe causes water leakage or water leakage. Sand leakage and the like may occur, which may cause interruption of construction or inability to proceed.

The first factor of such a problem in the conventional center-pushed tube is that the gap S (see FIG. 11) at the fitting portion between the center-pushed tube main body 1 and the center-pushed slide tube 2 is too large. Can be. For example, when the nominal diameter is 1000 mm, the gap S is 9 mm, and if a deviation occurs during propulsion, the gap S may be as large as 12 mm.

The second factor is that increasing the diameter of the sealing members 3 and 3 in order to cope with the above-mentioned change in the size of the gap S requires that the center push tube main body 1 and the center push slide tube 2 Is difficult to fit, so that the diameter cannot be increased beyond a certain value.

[0009] The third factor is that it is not possible to take an adventurous countermeasure such as adding a sealing member when there is a risk of water leakage or sand leakage or removing the sealing member when unnecessary. is there.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a center push pipe for a propulsion method which is excellent in waterproofness against water leakage and sand leakage.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a middle push tube which is slidable in the center axis direction of the middle push tube body outside a front end of the center push tube body. And an annular seal member is attached to the fitting surface between the middle-pushed tube main body and the middle-pushed slide tube, so that the center-pushed tube body is pressed between the front end of the middle-pushed tube main body and the middle-pressed slide pipe. In a push rod for a propulsion method, which is used by being interposed between other push pipes with a jack attached, a reinforcing ring made of a formed steel plate having a circumferential seal groove on an outer peripheral surface of the push pipe body is integrally formed. Provided,
A configuration in which the above-mentioned seal member is mounted in the above-mentioned seal groove is adopted.

[0012] A cylindrical reinforcing plate is provided on the outer peripheral surface of the middle pressed tube main body, and an end plate is provided on the front surface of the middle pressed tube main body. A configuration in which the above-described reinforcing ring is integrated by welding can be employed.

It is possible to adopt a structure in which a washing water ejection hole is provided behind the above-mentioned seal groove, or a structure in which a washing water ejection hole is provided behind the above-mentioned seal groove. Mud water from which earth and sand have been separated can be used as washing water ejected from the washing water ejection hole.

A seal portion is provided between the outer peripheral surface of the end plate of the middle push tube main body and the inner peripheral surface of the middle push slide tube, and a front end seal member is attached to the seal portion, and is detachably attached to the end plate. The attached push ring may be pressed against the front end seal member, and the middle push jack may be interposed between the push ring and the middle push slide tube.

The pressing ring is constituted by a combination of a plurality of arc members, and the pressing ring is mounted movably in the axial direction on the end plate, and during the compression of the front end sealing member accompanying the driving of the intermediate pressing jack. A configuration may be adopted in which the pressing wheel and the end plate are brought into contact with each other.

[0016]

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

The center push tube according to the first embodiment shown in FIGS. 1 to 3 is constituted by a combination of a center push tube main body 11 and a center push tube 12 as in the conventional case. Middle push tube body 1
Numeral 1 is made of concrete reinforced with a reinforcing steel cage, and a cylindrical reinforcing plate 13 made of a formed steel plate is integrally coated except for a front end portion of an outer peripheral surface thereof. A diameter receptacle 14 is provided. Further, a reinforcing ring 15 made of a formed steel plate is integrally attached to a front end portion of the reinforcing plate 13 by welding, and a thicker annular end plate 18 is integrated with a front end of the reinforcing ring 15 by welding. The front end portion of the body 11 is reinforced by the reinforcing ring 15 and the end plate 18.

As shown in FIG. 2, the reinforcing ring 15 has one circumferential sealing groove 16 formed in the middle, and a rear end portion having a contraction having the same diameter as the groove bottom of the sealing groove 16. A diameter portion 17 is formed. The reinforcing plate 13 is provided on the outer periphery of the reduced diameter portion 17.
Is welded. A seal member 19 is mounted in the seal groove 16, and is closely attached to the inner peripheral surface of the slide tube 12.

Further, a portion extending from the ridge 21 between the seal groove 16 and the reduced diameter portion 17 to the reduced diameter portion 17 penetrates through the reinforcing ring 15 and the reinforcing plate 13 and discharges the washing water discharge hole 22.
Are provided at predetermined intervals in the circumferential direction. The washing water jet hole 22 is normally closed by a plug 30.

An inclined plate 20 is provided at the step between the receiving port 14 and the reinforcing plate 13 so as to reduce the step.

The middle-push slide tube 12 is provided with a one-step smaller-diameter insertion port 24 at the front end of a cylindrical fitting portion 23 formed of a formed steel sheet as in the conventional case. An inward flange 25 is provided inside a step portion forming the insertion port 24.
Is provided, and an inward flange 26 is also provided at the tip of the insertion port 24 so as to face the flange 25. Both tsuba 25,2
The concrete 6 for reinforcement is filled between 6. A seal member 37 is attached to the outer peripheral surface of the above-mentioned outlet 24.

The screw hole 28 provided on the front surface of the end plate 18 is necessary in the case of an embodiment using a pressing ring described later.

The center push tube of the first embodiment is as described above. A required number of center push jacks 29 are interposed between the end plate 18 and the flange 25 at a required interval in the circumferential direction. Then, the respective ends of the other standard propulsion pipes are inserted into the reception port 14 at the rear end and the insertion port 24 at the front end, respectively, and the intermediate push pipe is interposed between these standard propulsion pipes.

When the propulsion is performed by the original pushing jack of the starting pit, the above-mentioned middle pushing jack 29 is contracted, and the propulsive force of the original pushing jack is transmitted forward. When the middle push method is performed, the middle push jack 29 is driven with the standard push tube inserted into the receiving port 14 as the reaction force receiving side, and the push tube connected to the middle push slide tube 12 and the front thereof. To move forward.

At this time, if necessary, pressurized water is spouted from the washing water spouting hole 22 to the outside through the gap S between the center-pushed pipe main body 11 and the center-pushed slide pipe 12, and the soil and the like clogged in the gap S are externally discharged. To reduce the slide resistance in the gap S. Mud water from which earth and sand have been removed can be used as the washing water in this case.

Since the above-mentioned sealing member 19 is mounted in the sealing groove 16 of the reinforcing ring 15, the gap S between the center-pushed tube main body 11 and the center-pushed slide tube 12, as shown in FIG. 19 is determined by the height exposed from the seal groove 16. For example, when the nominal diameter is 1000 mm, the gap can be set to be as small as about 2 mm, whereby the pressure exerted on the seal member 19 and the like can be reduced, and a high water stopping power can be maintained.

Next, a second embodiment will be described with reference to FIGS. In this case, in addition to the configuration of the first embodiment, the front end sealing member 32 is attached to the sealing portion 31 formed of a concave step provided on the outer peripheral surface of the end plate 18 and the front end sealing member 32 is tightened. A pressing wheel 33 is provided.

As shown in FIG. 5, the press wheel 33 is formed by combining three arc-shaped members into an annular shape, and is formed by a required number of bolts 43 screwed into the screw holes 28 of the end plate 18. Attached slidably in the axial direction.
The middle pressing jack 29 is interposed between the pressing wheel 33 and the collar 25 described above. Other configurations are the same as those of the first embodiment.

In the second embodiment described above, the bolt 3
The front end seal member 32 is compressed by tightening the pressing ring 33 with the end plate 18 and the intermediate pressing slide tube 1.
2, and a strong seal can be performed.

When the middle push jack 29 is driven, the front end seal member 32 is strongly compressed by the reaction force, and a strong seal is performed (see FIG. 7). in this case,
When the front end seal member 32 is compressed to some extent, the pressing ring 33
Of the front end seal member 32 so as not to apply more compression than necessary.

The front end sealing member 32 and the pressing wheel 3 as described above
The sealing by 3 may be performed from the beginning of the construction depending on the situation of the construction, or may be performed by the method of the first embodiment at the beginning of the construction, and the second embodiment may be performed halfway in response to a change in the situation. The method described above may be used. in this case,
Since the pressing wheel 33 is divided into three parts, it can be easily attached and detached.

Next, in the third embodiment shown in FIG. 8, another seal groove 16a is added to the reinforcing ring 15 of the first embodiment to provide two seal grooves 16, 16a. A waterproofing agent injection hole 35 is provided in a ridge portion between the two seal grooves 16, 16a. Seal members 19 and 19a are mounted in these seal grooves 16 and 16a. In addition, a closing plug 36 is fitted into the water blocking agent injection hole 35. The sealing strength is further increased by adding the sealing member 19a and injecting the water-stopping agent. Other configurations are the same as those of the first embodiment.

Next, in the fourth embodiment shown in FIG. 9, in addition to the second embodiment, two seal grooves 16, 16a are formed in the reinforcing ring 15 as in the third embodiment. And a water blocking agent injection hole 35 is provided between them. In this case, there is an operational effect obtained by combining the second embodiment and the third embodiment.

[0034]

As described above, according to the present invention, since the seal member mounted between the center-pushed tube main body and the center-pushed slide tube is mounted in the seal groove of the reinforcing ring, The gap between the push tube main body and the middle push slide tube can be reduced, whereby the pressure acting on the seal portion from the outside can be reduced, and the water stopping power can be increased.

In addition, by forming the above-mentioned reinforcing ring from the main body and the reinforcing ring by separate members, a relatively thin material can be used as the material of the reinforcing ring. In this case, the reduction in strength due to the thin material is compensated by the sealing groove itself acting as a reinforcing rib.

Further, by providing a washing water ejection hole,
Sediment and the like clogged between the center-pushed pipe main body and the center-pushed slide pipe are caused to flow out by jetting the washing water, thereby reducing slide resistance.

By using the front end sealing member and the pressing ring for tightening the front end sealing member, the water stopping power can be further enhanced.

[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 a partially enlarged sectional view of the above.

FIG. 4 is a sectional view of the second embodiment.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a partially enlarged sectional view of the above.

FIG. 7 is a partial sectional view at the time of operation of the above.

FIG. 8 is a partial cross-sectional view of the third embodiment.

FIG. 9 is a partial cross-sectional view of the fourth embodiment.

FIG. 10 is a sectional view of a conventional example.

FIG. 11 is a partially enlarged sectional view of the above.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 Middle push tube 12 Middle push slide tube 13 Reinforcement plate 14 Receptacle 15 Reinforcement ring 16, 16 a Seal groove 17 Reduced diameter 18 End plate 19, 19 a Seal member 20 Inclined plate 21 Ridge 22 Cleaning water jetting hole 23 Fitting portion 24 Insert Mouth 25, 26 Flange 27 Concrete 28 Screw hole 29 Middle press jack 30 Closure plug 31 Seal part 32 Front end seal member 33 Press ring 34 Bolt 35 Waterproofing agent injection hole 36 Closure plug 37 Seal member

Claims (6)

[Claims] An intermediate slide tube is fitted to the outside of the front end of the intermediate push tube body so as to be slidable in the direction of the central axis of the intermediate push tube main body. An annular seal member is attached to the fitting surface, and a middle push jack is attached between the front end of the middle push tube main body and the middle push slide tube to be used between other propulsion tubes for use. In the push-pipe for propulsion method, a reinforcing ring made of a formed steel plate having a circumferential seal groove is provided integrally on the outer peripheral surface of the push-pipe body,
A push pipe for a propulsion method, wherein the seal member is mounted in the seal groove. 2. A cylindrical reinforcing plate is provided on an outer peripheral surface of the center-pushed tube main body, and an end plate is provided on a front surface of the center-pushed tube main body,
The said centering pipe for the propulsion method according to claim 1, wherein the reinforcing ring is welded and integrated between the reinforcing plate and the end plate on the outer peripheral surface of the centering pipe main body. 3. A center push pipe for a propulsion method according to claim 1, wherein a washing water ejection hole is provided behind the seal groove. 4. The propulsion method according to claim 1, wherein said seal groove is provided at two places, and a water blocking agent injection hole is provided between both seal grooves. In-use push pipe. 5. A seal portion is provided between an outer peripheral surface of an end plate of the middle push tube main body and an inner peripheral surface of the middle push slide tube, and a front end seal member is attached to the seal portion, and is attached to and detached from the end plate. The propulsion according to any one of claims 1 to 4, wherein a freely mounted pressing ring is pressed against the front end sealing member, and the intermediate pressing jack is interposed between the pressing ring and the intermediate pressing slide tube. Middle push pipe for construction method. 6. The pressing ring is constituted by a combination of a plurality of arc members, and the pressing ring is axially movably attached to the end plate, and the compression of the front end sealing member accompanying the driving of the intermediate pressing jack is performed. The middle push pipe for a propulsion method according to any one of claims 1 to 5, wherein the push ring and the end plate are brought into contact with each other midway.