JP3458637B2 - Middle push pipe for propulsion method - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a metal pipe, a resin pipe,
The present invention relates to an intermediate push pipe used for a propulsion method such as a composite material pipe and a composite structure pipe.

[0002]

2. Description of the Related Art The propulsion method is generally used for burial construction of water and sewer pipes, etc. By pushing the pipes from the lower side wall of the starting vertical shaft toward the reaching vertical shaft while sequentially connecting them,
It is a method of burying pipes in the ground between these shafts.

FIG. 11 is a central longitudinal sectional view showing an implementation state of a generally used propulsion method.

In the propulsion method, a bearing wall 2 is provided on the rear side wall of the starting shaft 1 in the direction of pushing the pipe, and the rear end portion of the pipe 4 is fixed by a source pushing jack 3 which receives the reaction force. It is supposed to be pushed.

As for the tubes 4, the rear end 4b of the tube 4 on the front side in the propulsion direction and the front end 4a of the tube 4 on the rear side are connected by a method such as mounting a steel collar or welding. .

By the cylindrical blade 4c attached to the leading tube,
The ground material that has entered the pipe is sequentially excavated, and the shear after excavation is transported to the starting shaft 1 by a trobucket or the like, and is further carried out from the starting shaft 1 to the outside of the shaft. 8 is a horizontal shaft.

In this propulsion method, the frictional force between the pipe 4 and the surrounding ground 5 increases in proportion to the propulsion distance of the pipe, so that the reaction force acting on the bearing wall 2 increases as the distance increases. growing. Therefore, the propulsion distance is limited to a range that does not exceed the bearing capacity of the earth wall that supports the bearing wall 2.

Therefore, in the case of long-distance construction exceeding the propulsion distance, an intermediate pusher composed of an intermediate push jack 7 or the like is preliminarily provided between the rear end portion 4b of the propulsion side tube 4 and the front end portion 4a of the rear side tube 4. With the device 6 interposed, this middle-press jack 7
And the original push jack 3 are alternately expanded and contracted to gradually push in the pipe.

At this time, the spacer 9 or the new pipe 4 is added. FIG. 12 is a diagram showing an example of the middle push device.

In FIG. 12, an intermediate pushing device 6 is formed between the rear end portion 4b of the pipe 4 and the front end portion 4a of the pipe 4 which are adjacent to each other in the front and rear direction. 4 is fitted to the tip portion 4a.

A receiving ring 11 is fitted to the rear end portion 4b of the pipe 4, and the intermediate push jack 7 is installed between the receiving ring 11 and a receiving ring 13 provided in front of the intermediate push pipe main body 10. There is.

From the above, the pipe 4 in front of the intermediate pushing device 6 can be propelled by the stroke length of the intermediate pushing jack 7.

However, the intermediate pushing device 6 shown in FIG. 12 can be pushed directly by the intermediate pushing jack 7 on a pipe having a large wall thickness such as a ductile cast iron pipe or a concrete fume pipe, but it is thin. Since the thickness of a steel pipe or the like is smaller than that of the fume pipe or the like, it is not possible to directly adopt the above-mentioned center press device 6.

When such a thin steel pipe or the like is buried by a propulsion method, an intermediate pushing device 6 as shown in FIGS. 13 and 14 is used.
The inner push tube is known.

FIG. 13 is a diagram showing an example (prior art 1) of an intermediate push tube body used in a propulsion method for a thin-walled steel pipe or the like.

In FIG. 13, an annular pressure receiving plate 17 having a larger diameter than the outer diameter of the intermediate push tube body 10 is attached to the tip portion 10a of the intermediate push tube body 10.

The pressure receiving plate 17 is a tip portion 10 of the intermediate push tube body 10.
A plurality of ribs 18 are provided on the surface on the a side, and the ribs 18 are inserted into the inner push tube body 10, and the reinforcing ribs 18 are attached to the inner push tube body 10.
The fillet is welded to the inner wall of the.

The pressure receiving plate 17 has two pressure receiving plates 1 so that an intermediate pushing jack (not shown) can be stably attached.
Ribs 19 connect 7a (outside) and 17b (inside) so as to be integrated.

The intermediate push pipe body 10 and the pressure receiving plate portion 17 are integrally welded in advance by factory. This allows the thrust force to be easily transmitted to the intermediate push tube body 10 by the intermediate push jack (not shown) during propulsion.

FIG. 14 is a view showing another example (prior art 2) of an intermediate push pipe used in a propulsion method for a thin steel pipe or the like.

In FIG. 14, there is one in which a thick-walled tip 20 is welded to the tip of the intermediate push tube body 10 by groove processing. Reference numeral 21 is a welded portion by groove processing.

The tip thick-walled ring 20 is integrally welded to the tip of the intermediate push tube body 10 by factory welding in advance.

Further, in the method disclosed in Japanese Patent Laid-Open No. 7-62978, the first seat portion protruding on the inner peripheral surface of the propulsion pipe and the second seat portion protruding on the inner peripheral surface of the rear pipe are opposed to each other, These first
An intermediate push propulsion device is disclosed in which an intermediate push jack is inserted between the seat portion and the second seat portion (Prior Art 3).

FIG. 15 is an explanatory view showing an example of the above-mentioned middle push propulsion device. In FIG. 15, a second seat portion 23 is welded to the rear pipe 22 at the front end portion of the rear pipe 22 so that the front end surface of the rear pipe 22 and the front end surface of the second seat portion 23 are flush with each other.

A plurality of rib plates 29 are attached to the second seat portion 23 and welded to the inner peripheral surface of the front end portion of the rear pipe 22.

On the other hand, a first seat portion 25 is welded to the rear end portion of the propulsion pipe 24 in the propulsion pipe 24 so that the first end portion 25 and the rear end surface of the propulsion pipe 24 are joined to each other.
The rear end surface of the seat portion 25 is flush with the surface.

The first seat portion 25 is welded to the inner peripheral surface of the rear end portion of the plurality of rib plates 29 attached to the propulsion pipe 24.

The intermediate push jack 26 is mounted on the inner peripheral surface of the outer cylinder 28 constituting the collar 27 at the same time when the collar 27 is mounted, and is inserted between the first receiving portion 25 and the second receiving portion 23. To do.
The shapes of the first seat portion 25 and the second seat portion 23 may be arcuate or annular.

[0029]

However, the above-mentioned Prior Art 1, Prior Art 2 and Prior Art 3 are expected to have some effects in the propulsion method of a thin steel pipe or the like, but have the following problems.

In the prior art 1, after the completion of the propulsion work, the inside push jack and the pressure receiving plate 17 are removed, and the rear end portion 4b of the propulsion side pipe 4 and the tip of the inside push pipe body 10 are removed by the original pushing jack or the like. The parts 10a are joined, welded and connected.

In this case, when the pressure receiving plate 17 is removed, the rib 18 which is inserted into the intermediate push tube body 10 and welded is cut, or
Alternatively, the inner push tube body 1 up to the position of the inserted rib 18
It is necessary to cut 0, and in addition, in order to weld it to the tube on the propulsion side, it is necessary to groove the tip of the intermediate push tube body 10.

Therefore, it takes a long time to remove the intermediate pressing device on site, and the whole construction period of the installation of the buried pipe by the propulsion method is prolonged.

In the prior art 2, after the completion of the propulsion work, the inside push jack is removed and the tip thick ring 20 is cut from the tip of the inside push pipe main body 10 in the site tunnel, but after that, the inside of the pipe on the propulsion side is cut. In order to weld the push tube body 10, it is necessary to groove the tip of the middle push tube body 10.

Therefore, as in the case of the prior art 1,
It takes time to remove the middle pusher on the site, and the whole construction period of the installation of the buried pipe by the propulsion method is prolonged.

In Prior Art 1 and Prior Art 2, in addition to the low construction efficiency as described above, it is difficult to reuse members and parts (up costs), the working environment is bad, and the heat effect during cutting is high. It is necessary to protect and protect against fire and fire.

In the prior art 3, after the completion of the propulsion work, the middle push jack is removed in the local tunnel or the reaching shaft, and the hitting plate 29, the first rib receiving seat 25, and the second rib receiving seat 2 are provided.
3 is removed by gas fusing, but it takes time for gas fusing, it is difficult to reuse parts and parts (up cost), and the working environment is bad, and it is cured and protected against heat influence and fire during cutting. is necessary.

The present invention is intended for an intermediate push pipe used in a propulsion method for a thin steel pipe or the like, and is intended to solve the above-mentioned problems. The pressure receiving plate is attached to the tip of the intermediate push pipe body. ,
An intermediate push pipe for the propulsion method that is easy to remove, can reliably transmit the propulsive force, and can be easily connected to the pipe on the propulsion side that is constructed after the completion of the propulsion of the buried pipe. The purpose is to provide.

[0038]

The invention according to claim 1 is
Install the circular arc pressure receiving plate for the intermediate push jack
An inner push tube for the propulsion method attached to the end of the pipe,
The arc-shaped pressure receiving plate is smaller than the inner diameter of the inner tube body,
It is a double type circular pressure receiving plate consisting of linear pressure measuring plate.
Yes, it is configured by inserting ribs between the circular pressure plates,
The circular arc pressure receiving plate has a split type three that is inserted into the main body of the inner tube.
Is provided with a set bolt on the inner wall of the split sleeve.
And set the split sleeve on the inner wall of the intermediate push tube body with the set bolt.
It is an inner push tube for the propulsion method characterized by being fixed.

Here, the maximum linear dimension of the cross section means the maximum length dimension of a straight line connecting two points on the pressure receiving cross section.

According to the second aspect of the present invention, an intermediate push jack is provided.
Attach the circular arc-shaped pressure receiving plate to the pipe end of the intermediate push tube body.
It is a middle push tube for propulsion method, wherein the circular pressure receiving plate is
An arcuate receiver with a maximum linear dimension in cross section that is smaller than the inner diameter of the push tube body.
It is a double type circular pressure receiving plate consisting of a pressure plate,
It is configured by inserting ribs between the boards and has one or more circular
The platen is equipped with a split sleeve that is inserted into the center push tube body.
By installing a detachable connection mechanism between the arc-shaped pressure receiving plates
The circular pressure receiving plate was made into an annular shape and integrally connected and mounted.
It is an intermediate push tube for propulsion method characterized by the above.

The invention according to claim 3 provides an intermediate pushing jack.
Attach the circular arc-shaped pressure receiving plate to the pipe end of the intermediate push tube body.
A middle push tube for propulsion method, wherein the tube end of the middle push tube body is
Is an extraneous reinforcement ring that protrudes from the tip of the middle push tube body.
Are attached by welding, and the tip of the extrapolation reinforcing ring is
The circular pressure receiving plate is in contact with the circular pressure receiving plate
Is it an arcuate pressure receiving plate with a maximum linear dimension smaller than the inner diameter of the body?
The circular type pressure receiving plate is a split type that is inserted into the body of the central push tube.
A sleeve is provided and a set bolt is attached to the inner wall of the split sleeve.
And install the split sleeve in the middle push tube body with the set bolt.
An intermediate push pipe for propulsion method characterized by being fixed to a wall
It

The invention according to claim 4 is an intermediate push jack.
Attach the circular arc-shaped pressure receiving plate to the pipe end of the intermediate push tube body.
A middle push tube for propulsion method, wherein the tube end of the middle push tube body is
Is an extraneous reinforcement ring that protrudes from the tip of the middle push tube body.
Are attached by welding, and the tip of the extrapolation reinforcing ring is
The circular pressure receiving plate is in contact with the circular pressure receiving plate
Multiple circular cones with a maximum linear dimension smaller than the inner diameter of the body
It consists of a platen, and one or more arcuate pressure plates have a central push tube body.
A split sleeve is inserted inside the
Circular arc pressure receiving plate with removable connection mechanism between the plates
It is recommended that the
It is an intermediate push tube for the construction method.

The invention according to claim 5 is the tube end portion of the intermediate push tube body.
In addition, an extraneous reinforcement ring that protrudes from the tip of the center
Welded and attached, the tip of the extrapolation reinforcing ring receives an arcuate pressure
3. The method according to claim 1, wherein the board is brought into contact with the board.
It is an inner push tube for the propulsion method. The invention according to claim 6 is external
A slot is provided on the reinforcement ring to
A contract characterized in that a slot weld is formed between
Nakashishi for propulsion method according to any one of claims 3 to 5
It is a tube.

The split sleeve used in the present invention is to be attached to the arcuate pressure receiving plate, and when the arcuate pressure receiving plate is attached to the pipe end portion of the intermediate pusher pipe main body, the split sleeve is inserted into the intermediate pusher pipe main body. It has the shape of an arc-shaped plate so that it can be installed concentrically with the main body of the push tube. This makes it easy to position the arcuate pressure receiving plate when it is attached, and prevents fluctuation during propulsion.

If the split sleeve is arranged in an annular shape, the sleeve can be integrally formed on a concentric circle.

According to the present invention, an arcuate pressure receiving plate for installing the intermediate push jack on site is attached to the pipe end portion of the intermediate push pipe body,
Furthermore, when the removal is performed after propulsion, the arcuate pressure receiving plate has the maximum linear dimension of the cross section smaller than the inner diameter of the centering tube body, and the set bolt is attached to or detached from the split sleeve provided on the arcuate pressure receiving plate. Since the mechanism is provided, it is easy to attach to and detach from the pipe end.

Further, instead of the detaching mechanism for the set bolt of the split sleeve, a detachable connecting mechanism is provided between the arcuate pressure receiving plates so that the arcuate pressure receiving plates are annularly connected and integrally attached. Easy to attach and detach from the pipe end.

The operation of the present invention will be described below. The invention according to claim 1 is a double-type arc-shaped pressure receiving plate in which the split sleeve is fixed to the arc-shaped pressure receiving plate by welding in advance at the factory.
Yes, it is configured by inserting a rib between the circular pressure receiving plates .

When the above-mentioned arcuate pressure receiving plate is to be attached to the centering pipe body at the site, the arcuate pressure receiving plate has the maximum linear dimension of the cross section smaller than the inner diameter of the centering pipe body and is installed on the arcuate pressure receiving plate. The split sleeve has a set bolt attachment / detachment mechanism, so the split sleeve is inserted from the tip of the inner tube body, and the set bolt is tightened to secure it to the inner wall of the tube end of the inner tube body. After propulsion, the arcuate pressure receiving plate can be removed by loosening the set bolt. According to this, alignment and attachment / detachment are easy.

The invention according to claim 2 is a double type in which a split sleeve is fixed in advance to a circular pressure receiving plate by welding at a factory.
It is a circular arc pressure receiving plate, and ribs are inserted between the circular pressure receiving plates.
Configured . In this case, some of the arcuate pressure receiving plates may be prepared without fixing the split sleeve.

When the above-mentioned arcuate pressure receiving plate is to be attached to the inner tube body at the site, since the arcuate pressure receiving plate has the maximum linear dimension of the cross section smaller than the inner diameter of the inner tube body, the split sleeve is used. Insert the circular arc pressure receiving plate into the pipe end of the intermediate pressing pipe body by inserting it from the tip of the intermediate pressing pipe main body, and connect the adjacent circular arc pressure receiving plates annularly by a detachable connection mechanism to integrally connect them. The pressure receiving plate can be assembled. After the propulsion, the connection mechanism can be loosened and the arcuate pressure receiving plate can be removed. According to this, alignment and attachment / detachment are easy.

In this case, by inserting one to three arc-shaped pressure receiving plates to which the split sleeve is not fixed, it is possible to more easily attach and detach the arc-shaped pressure receiving plates to and from the inner push tube body.

The invention according to claim 1 or claim 2 described above
For the circular arc pressure receiving plate, a double type circular pressure receiving plate is used.
It is constructed by inserting ribs between double-type arc-shaped pressure receiving plates.
By increasing the thickness of the arc-shaped pressure receiving plate itself
Without increasing the rigidity and strength when propelling steel pipes, etc.
Can be made.

In this case, depending on the rigidity and strength, a plurality of ribs to be inserted between the double type arcuate pressure receiving plates can be attached.

The invention according to claim 3 is the tube end of the intermediate push tube body.
The external reinforcement ring that protrudes from the tip of the intermediate push tube body
Is attached by welding, and the tip of the extrapolation reinforcing ring receives an arcuate pressure.
By making contact with the board, the tip of the central push tube body and the arc
Since it is designed so that it does not come into direct contact with the pressure receiving plate,
The tip of the body should not be damaged by buckling due to the arc-shaped pressure receiving plate.
Yes. The invention according to claim 4 is the same as the invention according to claim 3.
The adjoining arc-shaped pressure receiving plate with a connection mechanism
To make an annular pressure plate and connect them together to assemble an annular pressure plate
It is designed to be able to

In addition, the tip end of the intermediate push tube body is pre-grooved, and after promotion, the intermediate push tube body and the tube on the propulsion side can be easily connected by field welding.

In the present invention, the extrapolation reinforcing ring is used for protecting the tube end portion of the intermediate push tube body without being removed after propulsion.

The invention according to claim 5 is the invention according to claim 1 or 2.
In the invention described above, it is made to project from the tip of the intermediate push tube body.
Weld the extrapolation reinforcing ring and attach it
Propulsion characterized by contacting the tip with a circular pressure receiving plate
It is a medium push tube for construction method. The invention according to claim 6 is the claim 3
In the invention according to any one of 1 to 5, extrapolation reinforcement
The ring is provided with a slot so that it can be
By forming a slot weld in the
By filling the gap between the body and the extrapolation reinforcing ring locally, steel pipes, etc.
Rigidity and strength are increased compared to when propelling
To ensure

[0059]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one form of the intermediate push tube.
There, FIG. 2 is a sectional view taken along A-A sectional view taken along line of FIG.

In FIG. 1, the intermediate push tube body 10 has an arcuate pressure receiving plate 30 in which an intermediate push jack (not shown) is installed at the end of the tube.
Is installed. The arc-shaped pressure receiving plate 30 is composed of two arc-shaped pressure receiving plates 30a and 30b. The arcuate pressure receiving plate 30 has a cross-section maximum linear dimension L smaller than the inner diameter of the centering pipe body 10.
It is necessary to consist of an arc-shaped pressure receiving plate. This facilitates on-site attachment to the inner push pipe body 10 and removal after propulsion.

The arcuate pressure receiving plate 30 is provided with split sleeves 31a and 31b to be inserted into the intermediate push tube body 10, and a plurality of reinforcing ribs 32 are fixed to the inner wall of the split sleeve.

By providing the reinforcing rib 32, the split sleeves 31a and 31b can be reinforced.

A set bolt 33 is provided between the reinforcing ribs 32 on the inner walls of the split sleeves 31a and 31b, and the split sleeves 31a and 31b are attached by the set bolt 33.
Fix it to the inner wall of 0.

Since the arcuate pressure receiving plates 30a and 30b have the maximum linear dimension of the cross section smaller than the inner diameter of the intermediate push tube body 10 and the split sleeves 31a and 31b are provided, the center alignment with the intermediate push tube body 10 is easy. Yes, split sleeves 31a, 3
Since it is fixed to the inner wall of the intermediate push tube body 10 with the set bolt 33 via the 1b, the arcuate pressure receiving plates 30a and 30b can be easily attached and detached.

The split sleeves 31a and 31b are arc-shaped plates that are located concentrically with respect to the shaft center when they are inserted into the intermediate push tube body 10. Here, as shown in FIG. 1, a gap portion is provided on the top and bottom sides of the inner wall of the intermediate push tube body 10, and split sleeves 31 of the arcuate pressure receiving plates 30a and 30b are provided on the left and right sides.
a and 31b are inserted and fixed to the inner wall of the intermediate push tube body 10 with the set bolt 33. Split sleeve 31a,
A plurality of reinforcing ribs 32 are fixed to the inner wall of 31b for reinforcement.

The reason why the gap is provided on the top and bottom sides of the inner wall of the intermediate push tube body 10 is to make it easier to attach and detach the arcuate pressure receiving plate 30.

As described above, even if the clearance is provided on the top and bottom sides and the middle push jacks are installed at the left and right positions, the load is applied to the top and bottom sides even if the middle push of the pipe is carried out. Will not be adversely affected.

However, the present invention is not limited to this,
The arc-shaped pressure receiving plate 30 may be attached in an annular shape as required.

FIG . 3 is a front view showing another form of the intermediate push tube body.
, And the 4 is a sectional view taken along B - B taken along line of FIG.

In FIG. 3, the intermediate push tube body 10 has an arcuate pressure receiving plate 30 in which an intermediate push jack (not shown) is installed at the end of the tube.
Is installed. The arcuate pressure receiving plate 30 is composed of two arcuate pressure receiving plates 30a and 30b, and has a cross-section maximum linear dimension L smaller than the inner diameter of the intermediate push tube body 10. As a result, it is possible to easily attach it to the middle push pipe body 10 on site and remove it after propulsion.

The arcuate pressure receiving plates 30a and 30b are provided with split mold sleeves 31a and 31b to be inserted into the intermediate push tube body 10, and a plurality of reinforcing ribs 32 are fixed to the split mold sleeve inner wall as shown in FIG. ing.

The split sleeves 31a and 31b are arc-shaped plates that are located concentrically with respect to the shaft center when the split sleeves 31a and 31b are inserted into the center push tube body. As a result, the centering of the center push tube body 10 is easy. Here, as shown in FIG. 3, arc-shaped pressure receiving plates 30c and 30d without split sleeves are attached to the top and bottom sides of the inner wall of the intermediate pusher body 10, and the circular arc pressure receiving plates 30a, 30b, 30c and 30d form an annular shape. In order to form and further integrate, the connecting mechanism 34 is provided between the arcuate pressure receiving plates.
As a result, the connection plate 34a is tightened with a mounting bolt nut 34b so as to be detachably fixed.

As described above, even if the arcuate pressure receiving plates 30c and 30d not provided with the split type sleeves are attached to the top and bottom sides and the center push jacks are installed at the left and right sides, the top and bottom of the pipe are pushed up and down. Since there is a load on the side, the driving force is not adversely affected.

However, the present invention is not limited to this.
An arc-shaped pressure receiving plate 30 provided with a split sleeve, if necessary
It may be attached in an annular shape by.

As described above, since the arcuate pressure receiving plate 30 has the maximum linear dimension L of the cross section smaller than the inner diameter of the intermediate push tube body 10 and is integrally attached to the intermediate push tube body by the detachable connecting mechanism 34, Easy to install and remove on site. FIG. 5 is a sectional view of an essential part showing an embodiment of the invention according to claim 3.

Here, the intermediate push tube body 1 shown in FIGS. 1 and 2 is used.
The structure of the arcuate pressure receiving plate 30 to be attached to the pipe end portion of No. 0 is double type arcuate pressure receiving plates 35 (outside) and 36 (inside), and the arcuate pressure receiving plate 35 and the arcuate pressure receiving plate 36 are connected by the ribs 37. It was done. Corresponding arc-shaped pressure receiving plate 35 (outside) and 3
Since 6 (inside) has the maximum linear dimension of the cross section smaller than the inner diameter of the intermediate push tube body 10 as described above, this makes it possible to attach it to the intermediate push tube body 10 at the site and remove it after propulsion. It will be easier. Here, two sets of arcuate pressure receiving plates 35
a, an arc-shaped pressure receiving plate 36a, an arc-shaped pressure receiving plate 35b, and an arc-shaped pressure receiving plate 36b.
36b are provided with split sleeves 31a and 31b, respectively, and split sleeves 31a and 31b are provided with set bolts 33, which are detachably fixed to the inner wall of the intermediate push tube body 10.

Reinforcing ribs 32 are provided on the split sleeves 31a and 31b for reinforcement. As described above, the thickness of the arc-shaped pressure receiving plate itself is formed by using the double-shaped arc-shaped pressure receiving plates 35 and 36 and inserting the rib 37 between the arc-shaped pressure receiving plates 35 and 36. This is to reduce the thickness, increase the rigidity and strength of the steel pipe when propelling it, and facilitate the handling.

FIG . 6 shows an embodiment of the invention according to claim 2.
FIG. In FIG. 6, the intermediate push tube body 1
The structure of the arcuate pressure receiving plate to be attached to the pipe end portion of No. 0 is double type arcuate pressure receiving plates 35 (outer side) and 36 (inner side). The maximum linear dimension of the cross section is smaller than the inner diameter, and the ribs 37 are connected. This facilitates on-site attachment to the inner push tube body 10 and removal after propulsion.

With the double type structure, the thickness of the arcuate pressure receiving plate itself can be reduced, the rigidity and the strength can be increased when the steel pipe or the like is propelled, and the handling can be facilitated.

Here, instead of fixing the split mold sleeves 31a and 31b to the inner wall of the inner push tube body 10 with the set bolt shown in FIG. 5, the inner wall of the inner push tube body as shown in FIG. An arc-shaped pressure receiving plate without a split sleeve is attached to the arc-shaped pressure receiving plate to form an annular shape, and in order to further integrate the connection plate 34a as a connecting mechanism 34 between the arc-shaped pressure receiving plates. It is fastened at 34b and detachably fixed.

As a result, the arcuate pressure receiving plates 35, 36 have the maximum linear dimension in cross section smaller than the inner diameter of the intermediate push tube body 10 and are integrally attached to the intermediate push tube body 10 by the detachable connecting mechanism 34. Since it is installed, it can be easily installed and removed locally.

However, the present invention is not limited to this,
Arc-shaped pressure receiving plate 3 with split sleeves if necessary
It may be mounted in an annular shape with only 5, 36.

FIG. 7 is a cross-sectional view of an essential part showing an embodiment of the invention according to claim 4. In FIG. In FIG. 7, the intermediate push tube body 1
No. 0 pipe end portion 10a is welded to an outer reinforcement ring 38 protruding from the tip of the intermediate push tube body 10, and the tip of the outer reinforcement ring 38 is brought into contact with the arc-shaped pressure receiving plate 36. .

Although the extrapolation reinforcing ring 38 is the thick extrapolation reinforcing ring 38a here, the thickness is not limited to this and the thickness can be appropriately selected.

Here, the main portion of the main push tube body for propulsion method in which the extrapolation reinforcing ring 38 and the above-mentioned double type arcuate pressure receiving plates 35 and 36 shown in FIG. 6 are combined is shown.

The outer reinforcement ring 38 protruding from the tip of the middle push tube body 10 is attached to the tube end portion 10a of the middle push tube body 10 by welding at the rear end thereof, and the tip of the outer reinforcement ring 38 is circular. It is in contact with the arc-shaped pressure receiving plate 36. Reference numeral 39 is a welded portion by fillet welding.

The extrapolation reinforcing ring 3 is particularly limited to welding.
8 is a pipe end portion 1 of the intermediate push pipe body 10 without being removed after propulsion
Because it is used for protection of 0a, welding is practical.

As described above, since the tip end of the intermediate push tube body 10 and the arcuate pressure receiving plate 36 do not directly contact with each other, the intermediate push tube body 1
The tip of 0 is not damaged by buckling due to the arcuate pressure receiving plate 36. Further, the tip end of the intermediate push tube body 10 can be groove-processed in advance, and after the promotion, the intermediate push tube body 10 and the tube on the propulsion side can be easily connected by field welding.

In addition to the embodiment shown in FIG. 7, an outer reinforcing ring 38 protruding from the tip of the intermediate push tube body 10 is attached to the tube end portion 10a of the intermediate push tube body 10 by welding. The structure in which the tip of the insertion reinforcing ring 38 is brought into contact with the arcuate pressure receiving plate 36 is combined with the arcuate pressure receiving plate 30 provided with the set bolt 33 shown in FIGS. 4, the arcuate pressure receiving plates 30a, 30b, 30c,
30d forms an annular shape, and a connecting plate 34a as a connecting mechanism between the arcuate pressure receiving plates is tightened with mounting bolts and nuts 34b, and is combined with the arcuate pressure receiving plate 30 that is detachably fixed. Can be

FIG . 8 shows an embodiment of the invention according to claim 6.
FIG. A slot portion 40 is provided in the outer insertion reinforcing ring 38, and a slot welding portion 41 is formed between the slot portion 40 and the outer surface of the intermediate push tube body 10.

A slot portion 40 is provided on the outer insertion reinforcing ring 38 so that the slot welded portion 4 is formed between the outer reinforcement ring 38 and the outer surface of the intermediate push tube body 10.
By forming 1, the gap between the intermediate push tube body 10 and the extrapolation reinforcing ring 38 is locally filled, and rigidity and strength are increased when a steel pipe or the like is propelled, so that transmission of propulsive force is more reliable. It is something that can be done.

The rear end portion of the outer reinforcement ring 38 is welded and attached to the intermediate push tube body 10. Reference numeral 39 is a welded portion.

Here, the main portion of the intermediate push pipe for propulsion method in which the extrapolation reinforcing ring 38 and the above-mentioned double type arcuate pressure receiving plates 35 and 36 shown in FIG. 6 are combined is shown.

The description of the double type arcuate pressure receiving plates 35 and 36 is omitted. Similarly, in addition to the embodiment shown in FIG. 8, in combination with the arcuate pressure receiving plate 30 provided with the set bolt 33 shown in FIGS. 1 and 2 described above, the arcuate shape shown in FIGS. A combination of the pressure receiving plates 30a, 30b, 30c, and 30d that are formed into an annular shape, and the connection plate 34a as a connecting mechanism between the arc pressure receiving plates is tightened with the mounting bolt nuts 34b to be detachably fixed. It can be used as a center push pipe for the propulsion method.

FIG. 9 is a front view showing an embodiment of a thrust tube for a propulsion method in which a double type arcuate pressure receiving plate is connected by two ribs, and FIG. 10 is a view taken along the line CC in FIG. FIG.

In FIG. 9 and FIG. 10, the intermediate push tube body 10 is equipped with double-type arcuate pressure receiving plates 35, 36 for installing the intermediate push jack 42 shown by the two-dot chain line at the tube end. The arcuate pressure receiving plates 35, 36 have a maximum linear dimension L of the cross section smaller than the inner diameter of the intermediate pusher pipe main body 10, and each of the four arcuate pressure receiving plates 35a, 35b, 35c, 35d, the arcuate pressure receiving plate 3
6a, 36b, 36c, 36d. The arcuate pressure receiving plates 35a, 35b, 35c and 35d and the arcuate pressure receiving plates 36a, 36b, 36c and 36d are provided with ribs 37a and 37b at corresponding positions and are connected to each other. The ribs 37a and 37b are mounted at appropriate positions in consideration of stress relaxation. Here, the positions of the inner surface of the rib 37a and the inner surface of the outer insertion reinforcing ring 38 provided at the tube end portion 10a of the intermediate push tube body 10 are made to coincide with the axis.

Split sleeves 31a and 31b to be inserted into the intermediate push tube body 10 are provided on the arcuate pressure receiving plates 36a and 36b, and a plurality of reinforcing ribs 32 are fixed to the inner wall of the split sleeves. The split sleeves 31a and 31b are arc-shaped plates that are located concentrically with respect to the shaft center when inserted into the inner push tube body 10, so that centering with the inner push tube body 10 is easy. Is.

On the other hand, as shown in FIG. 8, the intermediate push tube body 10 has the intermediate push tube body 10 at the pipe end portion 10a of the intermediate push tube body 10.
Is attached by welding, and the tip of the external reinforcement ring 38 is brought into contact with the arcuate pressure receiving plate 36.
The slot portion 40 is provided on the inner surface of the inner tube body 10, and the slot welding portion 41 is formed between the slot portion 40 and the outer surface of the intermediate push tube body 10.

As described above, since the tip of the intermediate push tube body 10 and the arcuate pressure receiving plate 36 do not directly contact with each other, the intermediate push tube body 1
The tip of 0 is not damaged by buckling due to the arcuate pressure receiving plate 36. Further, the tip end of the intermediate push tube body 10 can be groove-processed in advance, and after the promotion, the intermediate push tube body 10 and the tube on the propulsion side can be easily connected by field welding.

Further, the slot portion 4 is attached to the extraneous reinforcement ring 38.
0 is provided to form the slot welded portion 41 between the outer surface of the intermediate push tube body 10 and the gap between the intermediate push tube body 10 and the extraneous reinforcement ring 38 to locally fill, and a steel pipe or the like. Rigidity and strength are increased compared to during propulsion, and transmission of propulsive force is more reliable.

As described in the above embodiments, according to the present invention, the arcuate pressure receiving plate for installing the intermediate pushing jack can be easily attached to and detached from the pipe end portion of the intermediate pushing pipe main body. . Furthermore, in addition to the ease of mounting and dismounting the arc-shaped pressure receiving plate, the tip of the intermediate pressing pipe body and the arc-shaped pressure receiving plate are in direct contact with each other by attaching the outer reinforcement ring to the pipe end of the intermediate pressing pipe body. Therefore, the tip of the intermediate push tube body is not damaged by buckling or the like due to the arcuate pressure receiving plate. Further, the tip end of the intermediate push tube body can be groove-processed in advance, and after promotion, the intermediate push tube body and the tube on the propulsion side can be easily connected by field welding.

When the centering pipe body of the present invention is used in the field, an arcuate pressure receiving plate similar to that of the present invention is also provided at the rear end of the propulsion pipe.
An extra-strengthening ring is attached, a middle-press jack, etc. are installed, and the middle push is performed by the propulsion method.

[0103]

EXAMPLE An analysis was carried out as to whether or not the main push tube body for a propulsion method of the present invention was suitable as a thrust transmission structure.

"Basic Conditions" Design basic conditions are as follows.

Applicable caliber: 800 A to 2000 A Dimensional condition: The outer diameter of the propulsion pipe is adjusted to the fume pipe for sewage. This will reduce the civil engineering cost by using a semi-shielding machine as well. Promotion Load: 300～500Tf earth suffers: 5 to 10 m propulsion Distance: about 100m Promotion count: about 1000 supination pressure: 0.1~1.0kgf / cm ² insulation ^{resistance:> 10 4 Ω · m 2} / joint here 1000A was examined.

Here, the stress distribution in the case of receiving the intermediate and intermediate pushing jack propulsion force in the actual work is obtained, and the numerical analysis is carried out by the following method in order to quantitatively show the characteristics of the structural strength.

[Analysis method] Analysis code: ADINA Analysis model: Axisymmetric (pipe end length: 30) Element used: 8-node isoparametric material model: Linear elasticity (ν = 0.3, E = 21000k)
gf / mm ² ) External force condition: Pressure receiving surface distributed load (30 tf, medium pressure jack 8
Table) Contact conditions: Stick, slip (μ = 0.2), tension release

"Analysis Result" The total of 6 models of the following Examples 1 to 4 of the present invention and Conventional Examples 1 and 2 were analyzed. Present Invention Example 1: Middle Push Tube for Propulsion Construction Method Shown in FIG. 5 Present Invention Example 2: Middle Push Tube for Propulsion Construction Method Shown in FIG. 8 Present Invention Example 3: Middle Push Tube for Propulsion Construction Method Shown in FIG. Medium push tube for propulsion method shown in FIG. 9 Conventional example 1: Medium push tube body for propulsion method shown in FIG. 13 Conventional example 2: Medium push tube for propulsion method shown in FIG. The characteristics of structural strength were clarified by investigating the distribution tendency of equivalent stress in the part. However, the elastic coefficient of the reinforcing rib portion inserted in the pipe was corrected by reducing the thickness / circumferential length ratio.

In each of Examples 1 to 4 of the present invention and Examples 1 and 2 of the prior art, a double-type arcuate pressure receiving plate was used and brought into a state of being integrally contacted with the tube distal end portion of the intermediate pusher tube main body. The arcuate pressure receiving plate on the side of the central push pipe body is referred to as an inner flange portion, and the other arcuate pressure receiving plates are referred to as outer flange pressure receiving portions, which will be described below.

[Invention Example 1] The stress distribution in the center of the outer flange pressure receiving portion in the detachable structure (without the extraneous reinforcing ring) is of the welded type. At the contact portion between the flange surface of the inner flange pressure receiving portion and the tip end surface of the intermediate push tube body, stress concentration similar to that of the welded type is observed inside the intermediate push tube body. However, in this analysis, since it is treated as an axisymmetric model, the condition is that the tip end surface of the intermediate push tube body is in uniform contact over the entire circumference.

However, in the actual work, it is expected that local point-shaped or linear contact will occur in the circumferential direction and the radial direction, and due to the rotational deformation of the main pipe end surface, the pipe tip portion will be projected to the outside. , Elephant Foot Bulge (e
It exhibits a deformation that promotes lefant footbulge).

In particular, it is considered that this tendency becomes stronger as the contact is more localized in the circumferential direction, which causes local buckling.

Therefore, in the detachable structure, it is necessary to sufficiently enhance the plate bending rigidity of the tube side contact portion.

[Invention Example 2] The stress distribution in the detachable structure (with a thick-walled outer reinforcement ring) is such that the stress concentration at the center of the outer flange pressure receiving portion is the inner flange surface of the inner flange pressure receiving portion and the outer reinforcement ring. At the contact part of, a rather large local stress concentration is seen inside the ring.

However, no stress concentration was observed in the pipe body corresponding to the slot welded portion in the case of the third embodiment of the present invention described later, and local stress concentration was observed at the fillet toe between the reinforcing ring and the pipe body. However, if the shape of the toe is considered so that the fatigue strength during construction can be guaranteed, it is not an essential problem within the actual construction work.

This structure is difficult to apply in the case where the radial gap between the main pipe and the outer pipe in the middle-pushed pipe structure is severe, but when high plate bending rigidity is required at the pipe end. Is useful.

[Example 3 of the present invention] With respect to the stress concentration at the center of the outer flange pressure receiving portion in the detachable structure (with the outer reinforcement reinforcing ring, slot welding), the inner flange surface of the inner flange pressure receiving portion and the contact portion between the outer reinforcement reinforcing ring are described. In the inside of the ring, a rather large local stress concentration is observed.

However, since this time is a linear analysis (microdeformation, elastic microstrain), stress concentration relaxation due to localization of load distribution after loading is not considered, and stress in the main groove is also ignored. As small as possible.

Although stress is found in the fillet weld toe between the extrapolation reinforcing ring and the tube body of the intermediate push tube body, if the toe shape is taken into consideration so as to ensure the fatigue strength during construction. For example, it does not become an essential problem within the construction work.

Regarding the strength of the slot welded portion,
The same thing can be considered. This structure is useful in the case where the radial gap between the main pipe and the outer pipe in the middle push tube body structure is severely restricted.

Furthermore, in the actual propulsion process, when a bending angle occurs between the main pipe and the intermediate push pipe, one-point contact is caused and local buckling is very likely to occur, but this is extremely effective in preventing it.

[Invention Example 4] In the structures of the propulsion force transmitting portion having an H-shaped cross section as shown in Invention Example 1 to Invention Example 3, a large stress concentration may occur at the center of the pressure receiving surface of the outer flange pressure receiving portion. Since it became clear, stress concentration was alleviated by taking the detachable structure (with extrapolation reinforcing ring, slot welding) as an example and making the center rib double so that the rib diameter on the large diameter side and the axis of the reinforcing ring thickness coincide. .

From the analysis result, it was confirmed that the stress concentration in the pressure receiving portion and the thick wall portion of the pipe end was relieved significantly.

[Conventional Example 1] In the conventional structure of integral welding,
Large stress concentration is observed locally on the inner and outer surfaces of the center of the outer flange pressure receiving part.This is because the web part is single and the external force of the pressure receiving part is a distributed load, so a bending moment acts on the flange part and This is because the contact portion with the web is at a right angle.

However, since this time is a linear analysis (micro-deformation, elastic micro-strain), stress concentration relaxation due to localization of load distribution after loading is not taken into consideration. It is not an essential problem in the pipe because the stress concentration can be easily avoided by making it double.

When the load condition of this time is converted into the average axial compressive stress of the pipe body, it becomes about 8.4 kgf / mm ² , but in the case of the welded integral type, some stress concentration is seen at the end of the rib inserted in the pipe, but it is local. Is.

[Conventional Example 2] In the case of the thick pipe end (welding integrated type), there is no stress concentration on the thick pipe end portion and the pipe body, and local stress concentration on the joint portion between the thick wall portion and the pipe body. However, if the shape of the toe is considered so that the fatigue strength during construction can be guaranteed, it will not be an essential problem in the actual work.

However, this structure is the best in terms of rigidity and strength, but is not practical in terms of workability and cost. From the results of the above-mentioned numerical analysis, the intermediate push tube for propulsion method of the present invention could be put to practical use as a thrust transmission structure in any case.

[0129]

According to the present invention, the pressure receiving plate can be easily attached to and detached from the tip portion of the intermediate push tube body, the propulsive force can be surely transmitted, and the propulsion after the completion of the propulsion method is completed. The connection with the side pipe can be easily made.

[0130] The effects of the booster pipe for propulsion method according to the present invention will be specifically listed below. (1) Local buckling can be prevented by reinforcing the pipe end. (2) It is a lightweight, pressure-sensitive panel with a divided structure, and can be easily attached to and detached from the intermediate push tube body. (3) Since the attachment / detachment mechanism such as the set bolt is used, the pressure receiving plate can be repeatedly used and has a high durability. (4) On-site groove processing is not required due to the combination with the attachment of the extrapolation reinforcing ring to the tube end of the intermediate push tube body. (5) It is possible to add an effective reinforcing structure to the gap between the outer pipe and the inner pipe under the constraint condition. (6) It is possible to add a structure for preventing metal contact after construction and an anticorrosion structure against invading water. (7) The reinforcing member can be made multifunctional (centering, backing). (8) Since welding work is not carried out for on-site mounting and removal of the pressure receiving plate, deterioration or deterioration of anticorrosion performance due to welding heat can be prevented. (9) Factory production cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing one form of a center push tube body.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a front view showing another form of the middle push tube body.

4 is a sectional view taken along the line BB of FIG.

FIG. 5 is a cross-sectional view of an essential part showing an embodiment of the invention according to claim 1 .

FIG. 6 is a cross-sectional view of an essential part showing another embodiment of the invention according to claim 2 ;

FIG. 7 is a sectional view of an essential part showing an embodiment of the invention according to claim 4;

FIG. 8 is a sectional view of a key portion showing an embodiment of the invention according to claim 6 ;

FIG. 9 is a front view showing an embodiment of a centering pipe for a propulsion method in which a double-type arcuate pressure receiving plate of the present invention is connected by two ribs.

10 is a cross-sectional view taken along the line CC of FIG.

FIG. 11 is a central longitudinal sectional view showing an implementation state of a generally used propulsion method.

FIG. 12 is a diagram showing an example of a conventional centering device.

FIG. 13 is a diagram showing an example of an intermediate push pipe used in a conventional method for propulsion of a thin steel pipe or the like.

FIG. 14 is a view showing another example of a centering pipe used in a conventional propulsion method for a thin steel pipe or the like.

FIG. 15 is an explanatory diagram showing an example of a conventional center-push propulsion device.

[Explanation of symbols]

10 Middle push pipe body 30, 30a, 30b, 30c, 30d Arc-shaped pressure receiving plate 31a, 31b Split mold sleeve 32 Reinforcing rib 33 Set bolt 34 Connection mechanism 34a Connection plate 34b Bolt nut 35 35a, 35b, 35c, 35d Double type Arc-shaped pressure receiving plate (outside) 36 36a, 36b, 36c, 36d Double-type arc-shaped pressure receiving plate (inside) 37 Rib 38 Outer reinforcing ring 38a Wall thickness outer reinforcing ring 39 Welding section 40 Slot section 41 Slot welding section

Continuation of the front page (56) References JP-A-60-188539 (JP, A) Actual development 61-152093 (JP, U) Actual development 63-165392 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) F16L 1/024 E21D 9/06

Claims (6)

(57) [Claims] 1. A circular pressure receiving plate on which a middle-press jack is installed.
Is a middle push pipe for the propulsion method that is attached to the pipe end of the middle push pipe body.
Therefore, the circular pressure receiving plate is smaller than the inner diameter of the central push tube body.
A double type consisting of an arcuate pressure plate with a maximum linear dimension
It is a circular pressure receiving plate, and ribs are inserted between the circular pressure receiving plates.
The circular pressure receiving plate is inserted in the inner tube body.
A split sleeve is provided, and the set sleeve is set on the inner wall of the split sleeve.
Mount the set bolt and press the split sleeve
During the propulsion method characterized by being fixed to the inner wall of the pipe body
Push tube. 2. A circular pressure receiving plate on which the intermediate pushing jack is installed.
Is a middle push pipe for the propulsion method that is attached to the pipe end of the middle push pipe body.
Therefore, the circular pressure receiving plate is smaller than the inner diameter of the central push tube body.
A double type consisting of an arcuate pressure plate with a maximum linear dimension
It is a circular pressure receiving plate, and ribs are inserted between the circular pressure receiving plates.
One or more circular pressure receiving plates
The arc-shaped pressure receiving plate is provided with a split sleeve to be inserted.
A detachable connection mechanism is installed between the circular circular pressure receiving plates
Promotion that is characterized by being connected and attached integrally
Middle push pipe for construction method. 3. An arcuate pressure receiving plate on which an intermediate pushing jack is installed.
Is a middle push pipe for the propulsion method that is attached to the pipe end of the middle push pipe body.
There is a tip of the middle push pipe body at the pipe end of the middle push pipe body.
The extraneous reinforcement ring protruding from the end can be attached by welding.
And the tip of the extraneous reinforcement ring contacts the circular pressure plate.
However, the circular pressure receiving plate is smaller than the inner diameter of the central push tube body.
It consists of an arcuate pressure receiving plate with the maximum linear dimension in cross section
The board is provided with a split sleeve that is inserted in the middle push tube body.
Set the set bolt on the inner wall of the split sleeve to set it.
Use a bolt to secure the split sleeve to the inner wall of the intermediate
An inner push tube for the propulsion method characterized by and. 4. An arcuate pressure receiving plate on which an intermediate pushing jack is installed.
Is a middle push pipe for the propulsion method that is attached to the pipe end of the middle push pipe body.
There is a tip of the middle push pipe body at the pipe end of the middle push pipe body.
The extraneous reinforcement ring protruding from the end can be attached by welding.
And the tip of the extraneous reinforcement ring contacts the circular pressure plate.
However, the circular pressure receiving plate is smaller than the inner diameter of the central push tube body.
Consists of multiple circular pressure plates with maximum linear cross section, one
The circular pressure receiving plate above has a split type sleeve inserted in the body of the intermediate push tube.
The arc-shaped pressure receiving plate provided with a leave Detachable connection between
A continuous mechanism is provided to make the circular pressure receiving plate annular and connect integrally.
An intermediate push pipe for the propulsion method, which is characterized by being attached by 5. A tip of the middle push tube body at the tube end portion of the middle push tube body.
Weld the extrapolated reinforcement ring that is more
Make sure that the tip of the insertion reinforcing ring is in contact with the circular pressure receiving plate.
An inner push tube for a propulsion method according to claim 1 or 2. 6. A slot portion is provided on the outer reinforcing ring,
A slot weld was formed between the outer surface of the inner tube body
The method according to any one of claims 3 to 5, characterized in that
Middle push tube for the propulsion method of the above.