JP2014201896A - Intermediate push pipe for jacking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intermediate push pipe for a jacking method, which can be easily applied to a jacking method using a large-diameter propulsion pipe, and can reduce the labor and cost required for its manufacturing.SOLUTION: An intermediate push pipe 11 includes: a standard pipe 11A having a diameter equal to that of a propulsion pipe 20; and a tip outer shell 11B provided on the front end outer peripheral surface of the standard pipe 11A. An intermediate push slide pipe 12 includes: a standard pipe 12A having a diameter equal to that of a propulsion pipe 20; and a steel collar 12C provided on the rear end outer peripheral surface of the standard pipe 12A and externally insertable to the tip outer shell 11B. Therefore, the intermediate push pipe 11 and the intermediate push slide pipe 12 can be manufactured by utilizing the standard pipes 11A, 12A having the diameter equal to that of the propulsion pipe 20 without manufacturing an intermediate push pipe body called as an intermediate push T pipe and an intermediate push slide pipe called as an intermediate push S pipe. Accordingly, the intermediate push pipe can be easily applied to a jacking method using a large-diameter propulsion pipe 20, and the labor and cost required for its manufacturing can be reduced.

Description

  The present invention relates to an intermediate push pipe for a propulsion method employed when a pipe line is constructed underground.

In the propulsion method, a propulsion pipe is added to the rear end of the excavator sequentially, and a push jack is installed at the rear end to add propulsive force. It has been adopted.
In such a propulsion method, if the extension of the construction of the propelling pipe becomes long, the propulsive force becomes excessive and may exceed the proof stress of the propelling pipe, or may exceed the proof stress of the reaction wall in the start pit. Is used in combination with an intermediate pushing jack method in which the intermediate pushing jack interposed in the middle of the propelling pipe is divided and propelled.

  The thing of patent document 1 is known as an example of the conventional intermediate pressing pipe used for the said intermediate pressing method. As shown in FIG. 14, for example, this intermediate pusher tube is composed of a combination of an intermediate pusher tube body 1 generally called an intermediate pusher T tube and an intermediate pusher slide tube 2 called an intermediate pusher S tube. The slide tube 2 is fitted to the outside of the front end portion of the intermediate push tube main body 1 and is slidable in the central axis direction.

  Two annular seal members 3, 3 are provided on the outer peripheral surface of the intermediate push tube main body 1, and are in close contact with the inner peripheral surface of the intermediate push slide tube 2. A lubricant injection hole 4 is provided between the two seal members 3 and 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. Such an intermediate pusher tube is used between the standard propulsion pipes before and after the intermediate pusher pipe.

Conventionally, most pipes constructed by such a propulsion method have a diameter of about 3 m or less. This is due to the fact that transportation becomes difficult when the diameter of the propulsion pipe manufactured at the factory and transported to the site exceeds 3 m.
However, with the widespread use of common grooves in urban areas, it has become necessary to construct large-diameter pipes using the propulsion method. Therefore, it has been proposed to form a concrete segment having a shape obtained by dividing the propulsion pipe into two in the circumferential direction, and to assemble these two halved concrete segments into a propulsion pipe (see, for example, Patent Document 2). ). Even if the concrete segment divided in this way has a large diameter, it can be transported by a trailer or the like.

JP 11-280379 A JP 2004-183289 A

By the way, since the current intermediate push pipe is standardized for a propulsion pipe having a diameter of 3 m or less, the standard intermediate push pipe cannot be applied to a large-diameter propulsion pipe having a diameter of more than 3 m.
Accordingly, in the propulsion method using such a large-diameter propelling pipe, when the intermediate pressing method is used in combination, a medium pressing pipe main body called an intermediate pressing T pipe and a medium pressing S pipe are newly added. There is a problem that it is necessary to manufacture a push slide tube, which increases the labor and cost required to manufacture the intermediate push tube.

  The present invention has been made in view of the above circumstances, and provides an intermediate push tube for a propulsion method that can be easily applied to a propulsion method using a large-diameter propulsion tube and can reduce labor and cost required for manufacturing. With the goal.

In order to achieve the above object, the intermediate push tube for the propulsion method according to the present invention is provided with an intermediate push slide tube on the outer side of the intermediate push tube body so as to be slidable in the axial direction of the intermediate push tube body. An intermediate push jack is provided between the front end portion of the main body and the rear end portion of the intermediate push slide tube, and is used by being interposed between other propulsion tubes.
The intermediate push pipe main body includes a standard pipe having the same diameter as the propulsion pipe, and a cylindrical steel tip outer shell provided on the outer peripheral surface of the front end of the standard pipe,
The intermediate push slide pipe is provided on the outer peripheral surface of the standard pipe having the same diameter as the propulsion pipe and the rear end portion of the standard pipe so as to protrude rearward from the rear end of the standard pipe, and the tip portion It has a cylindrical steel collar that can be extrapolated to the outer shell.

In the present invention, the intermediate push tube main body includes a standard tube having the same diameter as the propulsion tube, and a cylindrical steel tip outer shell provided on the outer peripheral surface of the front end of the standard tube. The standard pipe can be manufactured in the same way as the propulsion pipe using the formwork used when manufacturing the propulsion pipe, and at that time, the front end outer shell is provided on the outer peripheral surface of the standard pipe. In addition, it is possible to manufacture an intermediate push tube body.
The intermediate push slide tube is equipped with a standard tube having the same diameter as the propulsion tube and a steel collar provided on the outer peripheral surface of the rear end of the standard tube. The standard tube can be manufactured in the same manner as the propulsion tube using the mold, and the intermediate push slide tube can be easily manufactured by providing a steel collar on the outer peripheral surface of the rear end of the standard tube.
Therefore, it is possible to use a standard pipe having the same diameter as that of the propelling pipe without newly manufacturing an intermediate pushing pipe body called an intermediate pushing T pipe and an intermediate pushing slide pipe called an intermediate pushing S pipe. Since the tube body and the intermediate push slide tube can be manufactured, it can be easily applied to a propulsion method using a large-diameter propelling tube, and the labor and cost required for manufacturing can be reduced.

  The said structure of this invention WHEREIN: It is preferable that the projection length from the rear end of a standard pipe is longer than the steel collar provided in the rear-end part outer peripheral surface of the said propulsion pipe.

  According to such a structure, since the protrusion length from the rear end of the standard tube of steel collar is long, the sliding amount of the intermediate push slide tube can be sufficiently secured.

  Moreover, in the said structure of this invention, it is preferable that the said standard pipe is manufactured using the formwork used when manufacturing the said propulsion pipe.

  According to such a configuration, since the standard pipe is manufactured using a mold used when the propulsion pipe is manufactured, labor and cost required for manufacturing can be reduced.

  Further, in the above configuration of the present invention, ring-shaped reinforcing plates are respectively provided on the end surface of the front end portion of the standard tube of the intermediate presser tube main body and the end surface of the rear end portion of the standard tube of the intermediate presser slide tube. It is preferable.

  According to such a configuration, since the pressing force of the intermediate push jack provided between the front end portion of the intermediate push tube main body and the rear end portion of the intermediate push slide tube can be received by the reinforcing plate, the intermediate push slide tube Can be reliably propelled forward by the intermediate push jack.

  Furthermore, the said structure of this invention WHEREIN: It is preferable that the said reinforcement board of the said intermediate | middle push slide pipe | tube is comprised by joining the some division | segmentation reinforcement board formed by the said reinforcement board being divided | segmented into the circumferential direction.

  According to such a configuration, by attaching a divided reinforcing plate to the end face of the rear end portion of the standard pipe of the intermediate push slide pipe, an attachment error is taken into consideration at the end face of the rear end portion of the standard pipe. However, a large-diameter reinforcing plate can be easily provided.

  Moreover, in the said structure of this invention, while the cyclic | annular seal member closely_contact | adhered to the inner peripheral surface of the said steel collar is provided in the front-end | tip part outer periphery of the front-end | tip part outer shell of the said intermediate | middle push pipe main body, both sides of this seal member It is preferable that an annular seal member stop is provided in contact with the seal member, and the seal member stop located on the front side of the seal member has a smaller diameter than the seal member stop located on the rear side.

  According to such a configuration, the seal member provided on the outer periphery of the distal end portion of the outer shell of the distal end portion can be securely fixed without being displaced in the axial direction by the stop of the seal member, and the seal member positioned on the front side of the seal member is fixed. Since it has a smaller diameter than the seal member stop located on the rear side, the outer shell of the tip can be easily inserted and fitted inside the steel collar.

  Moreover, in the said structure of this invention, it is preferable that the internal diameter of the said standard pipe | tube exceeds 3 m.

  According to such a configuration, since the inner diameter of the standard pipe is more than 3 m, the intermediate pushing method can be easily used in the propulsion method using a large diameter propulsion pipe having a diameter of more than 3 m.

Moreover, in the configuration of the present invention, the standard tube is configured by joining a pair of halved halved segments into a tubular shape,
The tip outer shell is configured by joining a pair of halved half-shells in a tubular shape,
The steel collar is preferably configured by joining a pair of halved half steel collars in a tubular shape.

  According to such a configuration, an intermediate press tube having an inner diameter of more than 3 m can be assembled at a construction site. Therefore, in the propulsion method using a large diameter propulsion tube having a diameter of more than 3 m, the intermediate press method can be more easily performed. Can be used together.

  Moreover, in the said structure of this invention, a joint is provided in the junction part of the said pair of half outer shell, and an elastic seal member is provided in this joint, The said pair of half outer shell is joined to the pipe shape. Preferably it is.

  According to such a configuration, since the elastic seal member is provided at the joint of the pair of halved outer shells, it is possible to ensure water-stopping at the joint and not weld the joint. No effect from heat.

  According to the present invention, a standard pipe having the same diameter as that of the propelling pipe is newly used without manufacturing an intermediate pushing pipe body called an intermediate pushing T pipe and an intermediate pushing slide pipe called an intermediate pushing S pipe. Thus, the intermediate press tube main body and the intermediate press slide tube can be manufactured, so that it can be easily applied to a propulsion method using a large-diameter propulsion tube, and the labor and cost required for manufacturing can be reduced.

An example of the intermediate push pipe for propulsion methods according to an embodiment of the present invention is shown and is a side view thereof. It is sectional drawing of a middle push pipe main body same as the above. It is a side view of a middle push pipe main body same as the above. It is a top view of the joint surface of the half segment of a middle push pipe main body equally. It is sectional drawing of the principal part of the junction part of the half segment of a middle push pipe main body equally. It is sectional drawing which shows the principal part of the junction part of a middle pushing pipe main body and a propulsion pipe. It is a side view of the propulsion pipe used for the propulsion method according to the embodiment of the present invention. An example of the intermediate push pipe for propulsion methods according to the embodiment of the present invention is shown, and is a sectional view of the intermediate push slide pipe. FIG. 3 is a side view of the intermediate push slide tube. (A) is sectional drawing which shows the principal part of the junction part of an intermediate pressing slide pipe and an intermediate pressing pipe main body, (b) is an expanded sectional view of the front-end | tip part of a front-end | tip part outer shell. It is a top view of the joint surface of the half segment of an intermediate | middle push slide tube as the same. It is sectional drawing of the principal part of the junction part of the half segment of an intermediate-push slide pipe | tube same as the above. It is sectional drawing of the principal part which shows the state which pushed the intermediate pushing slide pipe ahead with the intermediate pushing jack. It is sectional drawing which shows an example of the conventional middle push pipe for propulsion methods.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an example of an intermediate push pipe for propulsion method (hereinafter referred to as an intermediate push pipe) according to the present invention. The intermediate pusher tube 10 includes an intermediate pusher tube body 11 and an intermediate pusher slide tube 12 provided outside the intermediate pusher tube body 11 so as to be slidable in the axial direction of the intermediate pusher tube body 11. .

As shown in FIGS. 2 and 3, the intermediate push tube main body 11 is made of a standard tube 11A having the same diameter as a propulsion tube 20 described later, and a cylindrical steel made on the outer peripheral surface of the front end portion of the standard tube 11A. A tip outer shell 11B and a cylindrical steel collar 11C provided on the outer peripheral surface of the rear end of the standard tube 11A are provided. The standard pipe 11A referred to here means a cylindrical housing made of reinforced concrete excluding the tip outer shell 11B and the steel collar 11C.
The inner diameter (caliber) of the standard tube 11A is, for example, about 3.5 m, more than 3 m, and the outer diameter is about 4 m.

The standard pipe 11A is formed in a cylindrical shape by joining a pair of halved segments 11a, 11a made of reinforced concrete into a tubular shape. In FIG. 2, the position indicated by the alternate long and short dash line is the division position.
An annular fitting surface provided with a predetermined step with respect to the outer peripheral surface is formed on the outer peripheral surface of the front end portion of the standard pipe 11A, and the tip outer shell 11B is formed on the fitting surface. It is inserted. The level difference between the outer peripheral surface of the outer shell 11B at the front end portion and the outer peripheral surface of the standard pipe 11A fitted to the fitting surface is equal to the thickness of the steel collar 12C described later, and the thickness of the annular seal member 24. It is almost the same as the added dimension. Further, the rear end portion of the front end portion outer shell 11B is fitted over the outer peripheral surface of the standard tube 11A so as to be flush with the outer peripheral surface, beyond the step. Further, the tip outer shell 11B is formed in a cylindrical shape by joining a pair of half-shells 11b, 11b in a tubular shape.
A ring-shaped reinforcing plate 13 is fixed to the end surface of the front end portion of the standard pipe 11A. The reinforcing plate 13 is for receiving a pressing force of an intermediate pressing jack 25 described later.

The steel collar 11C is provided on the outer peripheral surface of the rear end portion of the standard pipe 11A by a predetermined length from the rear end of the standard pipe 11A, and the outer peripheral surface of the steel collar 11C is the standard pipe 11A. It is flush with the outer peripheral surface. Further, the steel collar 11C is formed in a cylindrical shape by joining a pair of halved steel collars 11c, 11c in a tubular shape.
The reinforcing plate 13 is formed in a ring shape by joining a pair of half-shaped reinforcing plates 13a and 13a.

The half segment 11a, the half shell 11b, the half steel collar 11c, and the half reinforcing plate 13a as described above are manufactured at the factory, and these are integrated to form a half split half press After the pipe half body 11h is transported to the site by a trailer or the like, the pair of half middle pipe body 11h, 11h is joined to the pipe at the site to form the pipe body 11h. Are assembled.
Moreover, the half segment 11a is manufactured using the formwork used when manufacturing the half segment 20a of the standard pipe 20 mentioned later.

As shown in FIGS. 2 and 4, a sheath tube 14 is inserted along the circumferential direction inside the half segment 11a of the half-pipe body 11h. The sheath tube 14 is predetermined in the axial direction. A plurality (for example, four) are arranged at intervals. Moreover, the recessed part 14a for introducing tension | tensile_strength into the PC steel wire penetrated by the sheath pipe | tube 14 is provided in the predetermined position of the internal peripheral surface of one half segment 11a among a pair of half segment 11a, 11a. Is formed.
Further, the half segment 11a is provided with a plurality of injection holes 11d for injecting the backing material at a predetermined interval in the circumferential direction, and a plurality of insert screws 11e are provided at a predetermined interval in the circumferential direction. In FIG. 2, the insert screw 11e provided in the lower half segment 11a is open to the inner peripheral surface of the half segment 11a, and the insert screw 11e provided in the upper half segment 11a is An opening is formed in the outer peripheral surface of the halved segment 11a, and a hook or the like for suspension is screwed into the insert screw 11e.

Further, a seal groove 11f is formed on the joint surface of the half segment 11a so as to extend in the axial direction of the half segment 11a. A seal member is inserted into the seal groove 11f when the half segment 11a is joined in a cylindrical shape, and a water stop rubber 11g is provided at the end of the seal groove 11f on the rear end side. Is provided in a state of being backed by the rib plate 11j. Furthermore, key holes 11i are provided in the joint surface of the half segment 11a at predetermined intervals in the axial direction and between the openings of the adjacent sheath tubes 14 and 14.
Further, as shown in FIGS. 4 and 5, heat shield plates 11m and 11m are provided at the rear ends of the joint surfaces of the half segments 11a and 11a. The heat shield plates 11m and 11m serve as backing materials when the end portions of the half steel collars 11c and 11c are abutted and welded together. A cushion material 11n is provided on the end face of the rear end portion of the half segment 11a.

  The half-pipe main body 11h, 11h having such a structure joins the half-segments 11a, 11a after applying an adhesive to the joining surface thereof, and inserts a seal member into the seal groove 11f, Further, the shear line 11p (see FIGS. 2 and 3) is inserted into the key hole 11i, and a groove is formed in the joint line appearing on the inner and outer peripheral surfaces of the joined half segments 11a and 11a. An elastic sealing 11s is provided in this groove (see FIG. 5). Further, a tension force is introduced into the PC steel wire inserted through the sheath pipes 14 and 14 of the joined half segments 11a and 11a at the recess 14a, whereby the half segments 11a and 11a are tightened. And are firmly joined.

  In the state where the half segments 11a and 11a are joined, the end portions of the half steel collars 11c and 11c are abutted and joined by welding. The ends of the half outer shells 11b and 11b and the half reinforcing plates 13a and 13a are abutted and joined to each other with an elastic seal member interposed therebetween.

As shown in FIG. 6, the intermediate push tube main body 11 assembled in this way is fitted with the front end portion of the normal propelling tube 20 at the rear end portion thereof in the ground.
As shown in FIG. 7, the propulsion pipe 20 has a standard pipe 20 </ b> A having the same diameter as the standard pipe 11 </ b> A constituting the intermediate push pipe main body 11, and a rear end portion outer peripheral surface of the standard pipe 20 </ b> A and a rear end portion And a steel collar 20C provided so as to protrude.
A fitting surface 20k is formed at the front end of the standard pipe 20A. And as shown in FIG. 6, while fitting this fitting surface 20k inside the steel collar 11C which protrudes from the rear end of the intermediate | middle push pipe main body 11, it fits in the internal peripheral surface of the said steel collar 11C. The annular seal members 20b, 20b provided on the mating surface 20k are brought into close contact with each other, and the end surface of the front end portion of the propelling tube 20 is brought into close contact with the cushion member 11n provided on the end surface of the rear end portion of the intermediate push tube main body 11. As a result, the intermediate push tube main body 11 and the propelling tube 20 are joined.

The standard pipe 20A of the propulsion pipe 20 has the same inner diameter and outer diameter as the standard pipe 11A of the intermediate pusher main body 11, but the axial length is longer than the standard pipe 11A. The steel collar 20C of the propulsion tube 20 has the same diameter and length as the steel collar 11C. The propulsion pipe 20 is formed in a cylindrical shape by joining a pair of halved segments 20a, 20a made of reinforced concrete into a tubular shape in the same manner as the intermediate push pipe main body 11.
The half segment 20a is provided with a sheath tube and an injection hole 20d in the same manner as the half segment 11a.
Also, the steel collar 20C is configured by joining a pair of half-cut steel collars 20c, 20c in the same manner as the steel collar 11C.

  The halved segments 20a, 20a having such a structure are joined after applying an adhesive to the joint surfaces as necessary, and a seal member is inserted into a seal groove provided on the joint surfaces. It joins by inserting the shear key 20p in a key hole. Further, a tension force is introduced into the recess in the PC steel wire inserted through the sheath tube of the joined halved segments 20a, 20a, whereby the halved segments 20a, 20a are tightened and tightened firmly. It is joined. Further, in a state where the half segments 20a and 20a are joined, the end portions of the half steel collars 20c and 20c are abutted and joined by welding.

As shown in FIGS. 8 and 9, the intermediate push slide tube 12 has a standard tube 12A having the same diameter as the propulsion tube 20, and an outer peripheral surface of the rear end portion of the standard tube 12A from the rear end of the standard tube 12A. A cylindrical steel collar 12C that is provided so as to protrude rearward and can be extrapolated to the outer shell 11B of the distal end portion of the intermediate pusher main body 11 is provided. In addition, the standard pipe | tube 11B said here means the cylindrical housing made from reinforced concrete except steel collar 12C.
The inner diameter (caliber) of the standard tube 12A of the intermediate push slide tube 12 is, for example, about 3.5 m, more than 3 m, and the outer diameter is about 4 m.
The standard tube 12A has the same inner diameter, outer diameter, and axial length as the standard tube 11A.

The standard pipe 12A is formed in a cylindrical shape by joining a pair of halved concrete segments halves 12a and 12a into a tubular shape. In FIG. 8, the position indicated by the alternate long and short dash line is the division position.
An annular fitting surface 12k provided with a predetermined step with respect to the outer peripheral surface is formed on the outer peripheral surface of the front end portion of the standard pipe 12A, and the preceding propulsion pipe 20 is formed on the fitting surface 12k. A steel collar 20 </ b> C provided at the rear end portion is fitted. The fitting surface 12k is provided with annular seal members 12b and 12b along the circumferential direction, and the seal members 12b and 12b are in close contact with the inner peripheral surface of the steel collar 20C.
Further, as shown in FIG. 10, a ring-shaped reinforcing plate 23 is fixed to the end surface of the rear end portion of the standard pipe 12A. This reinforcing plate 23 is for receiving the pressing force of the intermediate pushing jack.

The steel collar 12C is provided on the outer peripheral surface of the rear end of the standard pipe 12A by a predetermined length from the rear end of the standard pipe 12A, and the outer peripheral surface of the steel collar 12C is the standard pipe 12A. It is flush with the outer peripheral surface. That is, an annular fitting surface that is one step lower than the outer circumferential surface is formed on the outer circumferential surface of the rear end portion of the standard pipe 12A, and the steel collar 12C is fitted into this fitting surface. The protruding length of the steel collar 12C from the standard tube 12A is about three times longer than the protruding length of the steel collar 11C from the standard tube 11A. Therefore, the sliding amount of the intermediate push slide tube 12 can be sufficiently secured.
Further, the steel collar 12C is formed in a cylindrical shape by joining a pair of halved steel collars 12c, 12c in a tubular shape.
Further, the reinforcing plate 23 is configured by joining a plurality of divided reinforcing plates 23a formed by dividing the reinforcing plate 23 into eight in the circumferential direction. The split reinforcing plate 23a is manufactured by manufacturing the half segment 12a in a state where the half steel collar 12c is attached to the outer peripheral surface of the rear end portion of the half segment 12a, and then on the end surface of the rear end portion of the half segment 12a. It is attached as a retrofit. Further, joints are provided in the divided reinforcing plates 23a, 23a adjacent to each other in the circumferential direction, and joint materials such as epoxy resin are provided in the joints, whereby the divided reinforcing plates 23a, 23a are joined to each other.

The half segment 12a, the half steel collar 12c and the divided reinforcing plate 23a as described above are manufactured at a factory, and these are integrated into a half-shaped half-pushing intermediate slide tube 12h. After the split intermediate push slide tube 12h is transported to the site by a trailer or the like, the pair of half split intermediate press slide tubes 12h, 12h are joined in a tubular shape at the site to assemble the intermediate press slide tube 12.
Moreover, the half segment 12a is manufactured using the formwork used when manufacturing the half segment 20a of the standard pipe 20.

As shown in FIGS. 8 and 11, a sheath tube 14 is inserted along the circumferential direction inside the half segment 12a of the half-pushing slide tube 12h, and the sheath tube 14 is predetermined in the axial direction. A plurality (for example, four) are arranged at intervals. Further, of the pair of halved segments 12a, 12a, at a predetermined position on the inner peripheral surface of one halved segment 12a, there is a recess 14a for introducing tension to the PC steel wire inserted through the sheath tube 14. Is formed.
The half segment 12a is provided with a plurality of injection holes 12d for injecting the backing material at a predetermined interval in the circumferential direction, and a plurality of insert screws 12e are provided at a predetermined interval in the circumferential direction. In FIG. 8, the insert screw 12e provided in the lower half segment 12a is opened in the inner peripheral surface of the half segment 12a, and the insert screw 12e provided in the upper half segment 12a is An opening is formed in the outer peripheral surface of the halved segment 12a, and a hook or the like for suspension is screwed into the insert screw 12e.

  Further, a seal groove 12f is formed on the joint surface of the half segment 12a so as to extend in the axial direction of the half segment 12a. A seal member is inserted into the seal groove 12f when the half segment 12a is joined in a cylindrical shape, and a waterproof rubber 12g is provided at the end of the seal groove 12f on the rear end side. Is provided in a state of being backed by the rib plate 12j. Furthermore, key holes 12i are provided in the joint surface of the half segment 12a at predetermined intervals in the axial direction and between the openings of the adjacent sheath tubes 14 and 14.

  Further, as shown in FIG. 12, heat shield plates 12m and 12m are provided at the rear ends of the joint surfaces of the half segments 12a and 12a. The heat shield plates 12m and 12m serve as backing materials when the ends of the half steel collars 12c and 12c are abutted and welded together. Further, a cushion material 12n is provided on the end face of the rear end portion of the half segment 12a via the reinforcing plate 23 (divided reinforcing plate 23a).

  The half-pushing slide tube 12h, 12h having such a structure joins the half-segments 12a, 12a after applying an adhesive to their joint surfaces, and inserts a seal member into the seal groove 12f, Further, the shear lines 12p (see FIGS. 8 and 9) are inserted into the key holes 12i, and grooves are formed in the joining lines appearing on the inner and outer peripheral surfaces of the joined half segments 12a and 12a. An elastic sealing 12s (see FIG. 12) is provided in the groove. Furthermore, a tensile force is introduced into the concave portion 14a in the PC steel wire inserted into the sheath pipes 14 and 14 of the joined half segments 12a and 12a, whereby the half segments 12a and 12a are Tightened and firmly joined.

  In the state where the half segments 12a and 12a are joined, the end portions of the half steel collars 12c and 12c are abutted and joined by welding, and the adjacent divided reinforcing plates 23a and 23a are joined at the joining position. It is abutted and bonded with a joint material such as epoxy resin in between.

As shown in FIG. 10 (a), the intermediate push slide tube 12 assembled in this way is located inside the steel collar 12C protruding from the rear end of the standard tube 12A in the ground. 11 end shell 11B is fitted. Annular seal members 24, 24, 24 are provided on the outer periphery of the distal end portion of the outer shell 11B at intervals in the axial direction, and these seal members 24, 24, 24 are provided on the inner periphery of the steel collar 12C. Close to the surface. Further, as shown in FIG. 10B, annular seal member stoppers 24 a and 24 a are provided on both sides of the seal member 24 so as to contact the seal member 24. The seal member stopper 24a is formed of a round steel formed in a ring shape, and the seal member stopper 24a located on the front side of the seal member 24a located on the most distal side is more than the seal member stopper 24a located on the rear side. It has a small diameter. As a result, the tip outer shell 11B can be easily inserted inside the steel collar 12C.
Further, the reinforcing plate 13 provided on the end surface of the front end portion of the intermediate press tube body 11 is in close contact with the cushion material 12 n provided on the end surface of the rear end portion of the intermediate press slide tube 12.

  The intermediate pusher tube 10 configured as described above is disposed with the intermediate pusher jack 25 contracted between the intermediate pusher tube body 11 and the intermediate pusher slide tube 12, and is shown in FIG. 13 at a predetermined time. Thus, the intermediate push jack 25 is extended, and the intermediate push slide tube 12 is pushed forward with respect to the intermediate push tube main body 11 to be used. The intermediate push jack 25 is provided between the ring-shaped reinforcing plates 13 and 23 disposed so as to face the end surface of the front end portion of the intermediate push tube main body 11 and the end surface of the rear end portion of the intermediate push slide tube 12. Arrange at predetermined intervals in the direction. The reinforcing jacks 23 and 13 are in contact with intermediate push jacks 25 via cushioning materials 12n and 12n.

  After the intermediate push jack 25 is extended a predetermined number of times to propel the intermediate push slide tube 12 forward with respect to the intermediate push tube main body 11, the intermediate push jack 25 is removed from the intermediate push tube 10. By pushing forward the propulsion pipe 20 connected to the rear side of the intermediate push pipe main body 11 by a main push jack (not shown) provided in the start shaft, the intermediate push pipe main body 11 is moved forward. The reinforcing plate 13 at the front end of the intermediate push tube main body 11 is brought into contact with the cushion material 12n at the rear end of the intermediate push slide tube 12.

The intermediate press tube main body 11 and the intermediate press slide tube 12 have a large diameter (inner diameter) of more than 3 m, and it is very difficult to manufacture with the concrete centrifugal molding method. For this reason, in the present embodiment, the half segment 11a constituting the intermediate presser tube main body 11 and the half segment 12a constituting the intermediate pusher slide tube 12 are respectively arranged in the mold and made of half steel. Manufactured by placing the collars 11c, 12c, the half shell 11b, and the half reinforcing plate 13a, placing concrete, and compacting with a vibrator. The divided reinforcing plate 23a is attached to the end face of the rear end portion of the half segment 12a as a retrofit.
Then, by joining the pair of half-split intermediate pusher main bodies 11h, 11h and the pair of half-split intermediate pusher slide pipes 12h, 12h manufactured in this manner as described above, the intermediate pusher pipe main body 11 is joined. The intermediate push slide tube 12 is manufactured (assembled).

  In the present embodiment, the standard tubes 11A and 12A constituting the intermediate press tube main body 11 and the intermediate press slide tube 12 having a diameter exceeding 3 m are manufactured by joining the half segments 11a, 11a, 12a, and 12a. However, when the diameter of the intermediately pressed tube main body and the intermediately pressed slide tube is 3 m or less, each standard tube may be manufactured by using a concrete centrifugal molding method or a mold and compacting with a vibrator.

According to the present embodiment, the intermediate pusher main body 11 includes a standard pipe 11A having the same diameter as the propulsion pipe 20 and a cylindrical steel tip outer shell provided on the outer peripheral surface of the front end portion of the standard pipe 11A. 11B and the cylindrical steel collar 11C provided on the outer peripheral surface of the rear end of the standard pipe 11A, the standard pipe 11A can be manufactured in the same manner as the propulsion pipe 20, and the standard pipe By providing the front end portion outer shell 11B on the outer peripheral surface of the front end portion of 11A and the steel collar 11C on the outer peripheral surface of the rear end portion, the intermediate press tube body 11 can be easily manufactured.
Further, the intermediate push slide tube 12 includes a standard tube 12A having the same diameter as the propulsion tube 20 and a steel collar 12C provided on the outer peripheral surface of the rear end portion of the standard tube 12A. Similarly, the standard tube 12A can be manufactured, and the intermediate press slide tube 12 can be easily manufactured by providing the steel collar 12C on the outer peripheral surface of the rear end portion of the standard tube 12A.
Therefore, the standard pipes 11A and 12A having the same diameter as the propulsion pipe 20 are used without newly manufacturing an intermediate push pipe body called an intermediate push T pipe and an intermediate push slide pipe called an intermediate push S pipe. Thus, since the intermediate push tube body 11 and the intermediate push slide tube 12 can be manufactured, it can be easily applied to the propulsion method using the large diameter propulsion tube 20, and the labor and cost required for the manufacture can be reduced.

  In addition, the half segments 11a and 12a constituting the standard pipes 11A and 12A of the intermediate push body 11 and the intermediate push slide pipe 12 use a formwork used when the half segment 20a of the propulsion pipe 20 is manufactured. This reduces manufacturing effort and costs.

  Further, ring-shaped reinforcing plates 13 and 23 are provided on the end surface of the front end portion of the standard tube 11A of the intermediate push tube main body 11 and the end surface of the rear end portion of the standard tube 12A of the intermediate push slide tube 12, respectively. Therefore, the pressing force of the intermediate push jack 25 provided between the front end portion of the intermediate push tube main body 11 and the rear end portion of the intermediate push slide tube 12 can be received by the reinforcing plates 13 and 23. Therefore, the intermediate push slide tube 12 can be reliably pushed forward by the intermediate push jack 25.

  Further, since the reinforcing plate 23 of the intermediate push slide tube 12 is configured by joining a plurality (eight) divided reinforcing plates 23a, the end surface of the rear end portion of the standard tube 12A of the intermediate push slide tube 12 is provided. In addition, by joining and attaching the divided reinforcing plate 23a, the large-diameter reinforcing plate 23 can be easily provided on the end face of the rear end portion of the standard pipe 12A in consideration of the attachment error.

Further, since the standard pipes 11A and 12A have an inner diameter of more than 3 m, the intermediate pressing method can be easily used in the propulsion method using the large-diameter propulsion pipe 20 having a diameter of more than 3 m.
In addition, the standard pipes 11A and 12A are configured by joining a pair of halved segments 11a, 11a, 12a, and 12a in a tubular shape, and the distal end outer shell 11B has a pair of halved halves. The steel collars 11C and 12C are configured by joining the split outer shells 11b and 11b in a tubular shape, and the steel collars 11C and 12C are configured by joining a pair of halved steel collars 11c, 11c, 12c and 12c in a tubular shape. Therefore, the intermediate pusher tube 10 having an inner diameter of more than 3 m can be assembled at the construction site. Therefore, in the propulsion method using a large-diameter propulsion pipe having a diameter of more than 3 m, the intermediate pressing method can be used more easily.

  In addition, the seal member 24 provided on the outer periphery of the distal end portion of the outer shell 11B of the middle push tube body 12 can be securely fixed without being displaced in the axial direction by the seal member stop 24a, and the seal on the most distal end side Since the seal member stopper 24a located on the front side of the member 24a has a smaller diameter than the seal member stopper 24a located on the rear side, the tip outer shell 11B can be easily inserted and fitted inside the steel collar 12C. Can do.

10 Intermediate push tube 11 Intermediate push tube body 11A Standard tube 11B Tip outer shell 11C Steel collar 11a Half segment 11b Half shell 11c Half steel collar 12 Medium push slide tube 12A Standard tube 12C Steel collar 12a Half Split segment 12c Half steel collars 13 and 23 Reinforcement plate 20 Propulsion pipe 25 Middle push jack

Claims (9)

An intermediate press slide tube is provided outside the intermediate press tube main body so as to be slidable in the axial direction of the intermediate press tube main body, and between the front end portion of the intermediate press tube main body and the rear end portion of the intermediate press slide tube. An intermediate push pipe for a propulsion method that is provided with an intermediate push jack and is interposed between other propulsion pipes.
The intermediate push pipe main body includes a standard pipe having the same diameter as the propulsion pipe, and a cylindrical steel tip outer shell provided on the outer peripheral surface of the front end of the standard pipe,
The intermediate push slide pipe is provided on the outer peripheral surface of the standard pipe having the same diameter as the propulsion pipe and the rear end portion of the standard pipe so as to protrude rearward from the rear end of the standard pipe, and the tip portion An intermediate press tube for a propulsion method, characterized in that it is provided with a cylindrical steel collar that can be extrapolated to the outer shell.   2. The propulsion method according to claim 1, wherein the steel collar has a longer protruding length from the rear end of the standard pipe than a steel collar provided on the outer peripheral surface of the rear end of the propulsion pipe. Medium push tube.   The intermediate pipe for a propulsion method according to claim 1 or 2, wherein the standard pipe is manufactured using a mold used when the propulsion pipe is manufactured.   A ring-shaped reinforcing plate is provided on each of the end surface of the front end portion of the standard tube of the intermediate press tube body and the end surface of the rear end portion of the standard tube of the intermediate press slide tube. Item 4. An intermediate pushing tube for a propulsion method according to any one of Items 1 to 3.   5. The propulsion method according to claim 4, wherein the reinforcing plate of the intermediate push slide pipe is configured by joining a plurality of divided reinforcing plates obtained by dividing the reinforcing plate in the circumferential direction. Medium push tube. An annular seal member that is in close contact with the inner peripheral surface of the steel collar is provided on the outer periphery of the distal end portion of the outer shell of the intermediate push tube body, and annular seal member stops are provided on both sides of the seal member. Provided to contact the seal member,
The intermediate push tube for a propulsion method according to any one of claims 1 to 5, wherein the seal member stop located on the front side of the seal member has a smaller diameter than the seal member stop located on the rear side. .   The inner pipe of the propulsion method according to any one of claims 1 to 6, wherein an inner diameter of the standard pipe is more than 3 m. The standard tube is formed by joining a pair of halved segments into a tubular shape,
The tip outer shell is configured by joining a pair of halved half-shells in a tubular shape,
The propelling method intermediate press tube according to claim 7, wherein the steel collar is configured by joining a pair of half-shaped half-finished steel collars in a tubular shape.   9. The joint between the pair of half outer shells is provided with a joint, and an elastic seal member is provided on the joint so that the pair of half outer shells are joined in a tubular shape. Medium push-pipe for the propulsion method described in 1.

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