JP2851590B2 - Method of assembling and installing heavy member in tunnel and support structure for installing heavy member in tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling and installing a weight member in a tunnel and a support structure for mounting the weight member in the tunnel, and more particularly to a method for mounting a weight member on an inner surface of a tunnel through a pair of ring supports. The present invention relates to a device configured to be dispersed to support a weight member.

[0002]

2. Description of the Related Art In recent years, in order to minimize the damage caused by floods caused by heavy rain, etc., an underground water storage tunnel with a diameter of several meters and a length of several kilometers and an underground water storage tunnel with a water conduit (drainage pipe and air vent pipe) have been installed. A connected shaft has been constructed. The water storage tunnel is constructed by excavating the tunnel and lining the inner surface of the excavated tunnel with a segment by a shield excavator. It is necessary to install a reinforcing steel girder having the following structure at a predetermined position on the inner surface of the tunnel, and to harden the other positions with mortar.

The reinforcing steel girder is a partially cylindrical steel girder having a weight of 100 to 200 tons. It is almost impossible to transport the reinforcing steel girder from the outside of the tunnel to a connection portion in the tunnel. It is necessary to assemble the reinforcing steel girder by welding a plurality of the reinforcing steel girder divided bodies on the base erected on the shore. Therefore, when reinforcing the connecting portion, first, after assembling the reinforcing steel girder on the gantry, the reinforced steel girder is lifted by a plurality of chain blocks or lifting / lowering hydraulic jacks, and the gantry is removed. The steel girder is lowered to the bottom of the tunnel, and thereafter, the reinforcement girder is driven to move circumferentially along the inner surface of the tunnel by another plurality of hydraulic jacks, so that the reinforcement girder is installed at a predetermined position on the inner surface of the tunnel. .

[0004] When lifting or moving a heavy member, it is a general technique to apply a hydraulic jack. As described above, a hydraulic jack weighs 100 to 200 tons in a tunnel as described above. When raising and lowering or moving the member, a plurality of hydraulic jacks are provided so as to be connected to segments on the inner surface of the tunnel, and the load of the heavy member is received by the connection portion with the hydraulic jack on the inner surface of the tunnel. Particularly, when the weight member is driven to move in the circumferential direction along the inner surface of the tunnel, an arc-shaped load support member is fixed to a segment of the inner surface of the tunnel, and a hydraulic jack is connected to the load support member to reduce the load of the weight member. It is also conceivable to employ a technique of receiving the load on the inner surface of the tunnel via a load supporting member.

Incidentally, Japanese Patent Application Laid-Open No. 5-139686 discloses that
A traveling unit supported on a rail attached to the upper surface of the tunnel so as to be able to travel, a link mechanism with a base end connected to the traveling unit, a hydraulic cylinder that drives the link mechanism, etc. Having a grip capable of gripping a weight member connected thereto, gripping the weight member with the grip, raising the weight member with an elevating device, moving the traveling body along the rail, and transporting the weight member such as a segment. A transport device is described.

In Japanese Utility Model Laid-Open Publication No. 6-76499,
A pair of traveling members supported so as to be able to travel on rails attached to an upper surface of the tunnel, a horizontally oriented beam member connected to a lower side of the pair of traveling members, and a beam member attached to the pair of traveling members Device having a lifting device provided at the tip of a beam member, a weight member being hung by the lifting device, raised by the lifting device, and traveling along a pair of traveling bodies along the rails. A transport device that transports a heavy member such as a segment is described.

[0007]

However, a weight of 100-
In a structure in which a plurality of lifting hydraulic jacks are connected to a segment on the inner surface of the tunnel when lifting or lowering a 200 ton weight member, the load of the weight member acts intensively on the connection between the hydraulic jack on the inner surface of the tunnel and the segment. May be damaged, work safety cannot be ensured, and work efficiency is reduced. Even when the weight member is driven to move circumferentially along the inner surface of the tunnel, in a structure in which a plurality of hydraulic jacks are connected to segments of the inner surface of the tunnel, the load of the weight member is applied to a connection portion of the inner surface portion of the tunnel with the hydraulic jack. Since it acts intensively, the segments may be damaged, and as described above, there is a problem that work safety cannot be ensured and work efficiency is reduced.

In order to prevent the load of the weight member from acting intensively on the inner surface of the tunnel, an arc-shaped load supporting member is fixed to the segment on the inner surface of the tunnel with a plurality of connecting portions as described above. Although a structure in which a hydraulic jack is connected to this load supporting member is also conceivable, it is not easy to share the load evenly among a plurality of connecting parts, and when only some of the connecting parts share the load, the segment Since a large load acts on a local area, the segment may be damaged.

In the transfer device disclosed in Japanese Patent Application Laid-Open No. 5-139686 and the transfer device disclosed in Japanese Utility Model Application Laid-Open No. 6-76499, the load of the heavy member must be received at the connecting portion between the inner surface of the tunnel and the rail. When a heavy member such as a reinforcing steel girder is conveyed, the segment may be damaged.
It cannot be applied to raising and lowering a heavy member such as a reinforcing steel girder having a weight of 00 to 200 tons, and of course it cannot be applied to moving the heavy member from the bottom of the tunnel along the inner surface of the tunnel in the circumferential direction.

An object of the present invention is to provide a method for assembling and installing a heavy member in a tunnel and a supporting structure for installing the heavy member in a tunnel, to ensure work safety and improve work efficiency, and to surely reduce the load on the heavy member. Support, etc.

[0011]

According to a first aspect of the present invention, there is provided a method for assembling and installing a weight member in a tunnel, comprising: assembling the weight member in a tunnel and then installing the weight member at a predetermined position on the inner surface of the tunnel; A first step of providing a pair of ring supports along the inner surface of the tunnel near the outer sides of both ends in the center direction and arranging a mount for assembling the weight member between the ring supports, and a step of assembling the weight member on the mount. Two steps,
A third step of rotating and restraining a pair of ring supports to the inner surface of the tunnel before or after the second step, and a state in which both ends of the weight member are supported on the pair of ring supports by a plurality of lifting hydraulic jacks; A fourth step of removing the gantry and lowering the weight member to the bottom of the tunnel with a plurality of hydraulic jacks supported by a pair of ring supports to move both ends of the weight member in the circumferential direction along the inner surface of the tunnel. And a fifth step of installing at a predetermined portion of the inner surface of the tunnel.

When assembling the weight member in the tunnel and installing it at a predetermined position, first, a pair of ring supports along the inner surface of the tunnel are provided near the outside of both ends in the axial direction of the tunnel at the position where the weight member is installed. A gantry for assembling the weight member is arranged between them (first step). Next, the weight member is assembled on the gantry (second step), and before or after the second step, the pair of ring supports are rotationally restrained on the inner surface of the tunnel (third step). Thereafter, with the both ends of the weight member being supported on a pair of ring supports by a plurality of lifting hydraulic jacks, the gantry is removed, and the weight member is lowered to the bottom of the tunnel (fourth step).
Both ends of the weight member are driven to move circumferentially along the inner surface of the tunnel by a plurality of hydraulic jacks supported by a pair of ring supports, and are installed at predetermined portions of the inner surface of the tunnel (fifth embodiment).
Process).

In the method for assembling and installing a heavy member in a tunnel, a pair of ring supports are provided along the inner surface of the tunnel in a first step, and a pair of ring supports are rotationally restrained on an inner surface of the tunnel in a third step. Therefore, in the fourth step, when the gantry is removed and the weight member is lowered to the bottom of the tunnel, the load of the weight member is dispersed to the lower portion of the inner surface of the tunnel via a pair of ring supports, and the weight member is securely removed. In the fifth step, when the weight member is driven to move in the circumferential direction along the inner surface of the tunnel in the fifth step, the load of the weight member is dispersed to the inner surface of the tunnel through a pair of rotationally constrained ring supports to reduce the weight. The members can be reliably supported, work safety can be ensured, and work efficiency can be improved. Since the pair of ring supports are provided along the inner surface of the tunnel, the working space in the tunnel is hardly restricted, and the heavy members are removed without obstruction even after being installed at a predetermined portion of the inner surface of the tunnel. Since it is not necessary, the work load after installation can be reduced.

According to a second aspect of the present invention, there is provided a method for assembling and installing a weight member in a tunnel according to the first aspect of the present invention, wherein, in the third step, a plurality of locked portions of each ring support are connected via an elastically deformable buffer member. It is characterized in that a pair of ring supports are rotationally constrained to the inner surface of the tunnel by being respectively engaged with a plurality of engaging portions on the inner surface of the tunnel. That is,
In the fifth step, when the weight member is driven to move in the circumferential direction along the inner surface of the tunnel, the load of the weight member is reliably dispersed to the plurality of locking portions of the inner surface portion of the tunnel through the elastic deformation of the cushioning member. be able to. Other operations are the same as those of the first aspect.

According to a third aspect of the present invention, there is provided a method for assembling and installing a weight member in a tunnel, wherein a center hole jack is used as a lifting hydraulic jack in the second aspect of the invention. That is, the center hole jack makes it possible to easily, reliably and efficiently raise and lower the weight member. Other effects are the same as those of the second aspect. Incidentally, a general center hole jack has a step rod extending through the center hole,
Fix one of the center hole jack or step rod to the ring support and fix the other to the weight member,
The center hole jack is driven, and the weight member is moved up and down through the relative movement between the center hole jack and the step rod.

According to a fourth aspect of the present invention, there is provided a support structure for moving a weight member in a tunnel in a circumferential direction along an inner surface of the tunnel and mounting the weight member at a predetermined position. , A pair of ring supports arranged along the inner surface of the tunnel near the outside of both ends in the axial direction of the tunnel, a rotation restraining structure for rotationally restraining these ring supports on the inner surface of the tunnel, and a pair of ring supports. And a connecting piece for connecting a hydraulic jack for moving and driving the weight member.

That is, when the weight member is driven to move in the circumferential direction along the inner surface of the tunnel, the load of the weight member is dispersed to the inner surface of the tunnel via a pair of rotation-restricted ring supports, and the weight member is moved. As a result, it is possible to reliably support the work, to secure work safety, and to improve work efficiency. In addition, since a pair of ring supports are provided along the inner surface of the tunnel, the working space in the tunnel is hardly restricted, and even after the weight member is installed at a predetermined portion of the inner surface of the tunnel, it is almost in the way. It is not necessary to remove it, so that the work load after installation can be reduced.

According to a fifth aspect of the present invention, there is provided a supporting structure for installing a heavy member in a tunnel, wherein the rotation restraining structure is provided on a plurality of locking portions provided on the inner surface of the tunnel and on each ring support. A plurality of locked portions respectively locked to the plurality of locking portions, and elasticity provided between the locking portions and the locked portions of each set and fixed to one of the locking portions and the locked portions. And a deformable buffer member. That is, when the weight member is driven to move in the circumferential direction along the inner surface of the tunnel, the load of the weight member can be reliably dispersed to the plurality of locking portions of the inner surface portion of the tunnel through the elastic deformation of the cushioning member. Other operations are the same as those of the fourth aspect.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is a method for assembling a reinforcing steel girder and installing it at a predetermined position when reinforcing a connection portion connected to an intake shaft with a reinforcing steel girder in a flood prevention underground water storage tunnel, and This is an example of the case where the present invention is applied to a structure for supporting a weight member when installed at a predetermined portion.This embodiment is a method for assembling and installing a weight member in a tunnel, and a supporting structure for installing a weight member in a tunnel. It includes both explanations.

The water storage tunnel 1 will be described. The water storage tunnel 1 has a diameter of several meters (for example, about 13 m) and a length of several kilometers.
(For example, about 30 km) An underground water storage tunnel for flood prevention is constructed by using a shield machine (not shown) to excavate the tunnel and lining (primary lining) the inner surface of the excavated tunnel with segments. As shown in FIG. 1, in the connection portion 3 connected to the intake shaft 6 by the water pipe 7, the inner surface of the tunnel primary lining with the ductile segment 2 is reinforced with the introduction opening 4 a. The steel girder 4 and the mortar 5 are reinforced by secondary lining.

As shown in FIG. 2 to FIG.
Is a partially cylindrical steel girder having a weight of 100 to 200 tons (for example, 150 tons), and a gantry 60 in the tunnel.
The plurality of reinforcing steel girder divided bodies are welded and assembled, and then driven downward to the bottom of the tunnel by the plurality of center hole jacks 30, and driven to move circumferentially along the inner surface of the tunnel by the plurality of hydraulic jacks 50. , Installed on the side of the inside of the tunnel. Until the reinforcing steel girder 4 is installed on the side surface of the inner surface of the tunnel, the ductile segment 2 has an opening 2a for connecting the water conveyance communication pipe 7.
(Refer to FIG. 1) is not formed, and after the reinforcing steel girders 4 are installed, the ductile segments 2 are partially removed to form openings 2a.

Next, a structure for supporting the reinforcing steel girder 4 when the reinforcing steel girder 4 is assembled and installed on the side surface of the tunnel will be described. As shown in FIGS. 2 to 4, when reinforcing the connecting portion 3 on which the primary lining is performed by the ductile segment 2, the reinforcing steel girder 4 is installed near the outside of both ends in the axial direction of the tunnel at the position where the reinforcing steel girder 4 is installed. A pair of ring supports 10 along the inner surface of the tunnel are provided with their outer peripheral surfaces abutting on the ductile segments 2 and rotationally constrained by the rotation constraining structure 20 on the inner surface of the tunnel. Here, FIG.
As shown in FIG. 7, the ductile segment 2 is formed in a substantially box-like shape having a rectangular shape in plan view and having a convex portion 8 at the center, and the upper surface of the convex portion 8 and the outer surface of the ring support 10 are in contact with each other.

As shown in FIGS. 2 and 3, when the reinforcing steel girder 4 is moved up and down, four sets of center hole jacks 30 are used. A supporting beam 13 is connected to the connecting piece 11 of the pair, and the distal ends of a pair of step rods 15 extending downward are supported by the supporting beam 13 via an equalizer 35.
A pair of center hole jacks 30 each having a pair of step rods 15 inserted therein are arranged so as to be able to move up and down. A pair of beam members 14 extending in the axial direction of the tunnel is connected to the upper side of the reinforcing steel girder 4 by a plurality of connecting members.
The set of center hole jacks 30 is fixed, and the four sets of center hole jacks 30 are driven synchronously to raise and lower the reinforcing steel girder 4 together with the four sets of center hole jacks 30.

On the other hand, as shown in FIG. 4, when the reinforcing steel girder 4 is moved along the inner surface of the tunnel, it is performed using two sets of hydraulic jacks 50, and is fixed to the lower end of each ring support 10. The base end of the hydraulic jack 50 is connected to the connected piece 12, and a suitable one of the connecting brackets 55 a to 55 c provided on the reinforcing steel girder 4 is connected to the tip of a piston rod 52 extending from the hydraulic jack 50. Connection part 5
With the 2a connected, the two sets of hydraulic jacks 50 are driven synchronously to move the reinforcing steel girder 4 along the inner surface of the tunnel.

Next, the rotation restricting structure 20 will be described. As shown in FIGS. 5 to 7, the rotation restraining structure 20
It has a plurality of rotation restraining members 21A and 21B fixed to the end of the ring support 10 in the axial direction of the tunnel, and locks the locked portions 24 of the plurality of rotation restraining members 21A and 21B with the locked portions 24. The ring support 10 is locked by the plurality of locking portions 9 on the inner surface of the tunnel via an elastically deformable buffer member 25 (see FIGS. 9 and 10) fixed to the inner surface of the tunnel. Is configured. The locking portion 9 is formed on the side wall of the ductile segment 2.

As shown in FIG. 5, the rotation restraining member 21A restrains the ring support 10 from rotating clockwise, and the ring support 21B restrains the ring support 10 from rotating counterclockwise. As shown in FIG. 8, on the outer peripheral portion of each ring support 10, rotation restricting members 21A for restricting clockwise rotation are provided at, for example, six places, and rotation restricting members for restricting counterclockwise rotation are provided. 21B
Are provided, for example, at 14 locations. Rotation restraint member 21
The reason why the rotation restraining members 21B are provided more than A is to reliably restrain the ring support 10 from rotating counterclockwise when the reinforcing steel girder 4 is moved clockwise along the inner surface.

As shown in FIGS. 9 and 10, each of the rotation restricting members 21A and 21B is connected to a rectangular parallelepiped connecting block 22 fixed to the ring support 10, and to the locking portion 9 fixed to the connecting block 22. A block-shaped member 23 having a locked portion 24 to be stopped, and a buffer member 25 fixed to the locked portion 24 are provided.
After the ring support 10 is constructed, the connection block 22 is fixed to the outer peripheral portion of each ring support 10 by welding and fixed thereto after the ring support 10 is constructed.

The center hole jack 30 will be described. As shown in FIG. 11, a flange portion 31 is provided on an outer peripheral portion of each center hole jack 30, and the flange portion 31 is connected to the beam member 14 of the reinforcing steel girder 4 by a connecting rod 32. On the other hand, the step rod 15 whose tip is fixed to the equalizer 35
The third insertion hole 13a, the center hole jack 30, and the beam member 14 are inserted and extend downward. As shown in FIG. 12, each center hole jack 30 is
5, a first opening / closing device 40 connected to the jack device 35 so as to be able to move up and down, and a second opening / closing device 4 fixedly provided below the jack device 35.
And the step rod 15 is provided with the first opening / closing device 4.
0, the jack device 35 and the second opening / closing device 45 are inserted in through holes 40a, 35a and 45a respectively formed in the jack device 35 and the second opening / closing device 45, and extend in the vertical direction.

Since the first and second opening / closing devices 40 and 45 have the same structure, they are denoted by the same reference numerals, and the first opening / closing device 40 will be described as shown in FIG.
Has a collet 41 that can move up and down, and a hydraulic cylinder 42 that drives the collet 41 up and down. As shown in FIG. 13, the collet 41 is urged downward by a spring 42, and the collet 41 is normally locked to the locking portion 15a of the step rod 15 so that the step rod 15 and the opening / closing devices 40 and 45 are connected. When the collet 41 is raised by the hydraulic cylinder 42 when the relative movement becomes impossible, the insertion portion 41a at the center of the collet 41 is opened, and the locking portion 15a
The lock of the collet 41 is released, and the step rod 15 and the opening / closing devices 40 and 45 are in a state where they can move relative to each other.

That is, when the center hole jack 30 is raised and lowered, the step rod 15 and the first opening / closing device 40 are set in a state where they can be relatively moved, and the step rod 15 and the second opening / closing device 45 are set in a state where they cannot be moved relatively. After the first opening / closing device 40 is driven upward by the jack device 35 to raise the predetermined stroke, the step rod 15 and the first opening / closing device 40 are made to be in a state in which they cannot be relatively moved. When the jack device 35 is driven in the reverse direction with the relative movement between the jack device 35 and the jack device 35, the second opening / closing device 45 moves up together with the jack device 35, and the center hole jack 30 moves down by the reverse operation. . Thus, four sets of center hole jacks 3
When 0 is synchronously driven, the reinforcing steel girder 4 can be moved up and down.

As shown in FIG. 4, the hydraulic jack 50
This is a general hydraulic jack having a cylinder body 50 and a piston rod 52. When the reinforcing steel girder 4 on the bottom is moved to the side, first, the connecting part 52a of the piston rod 52 and the connecting bracket 55a are connected. After the reinforcing steel girder 4 is moved by a predetermined stroke by the pair of hydraulic jacks 50 and the reinforcing steel girder 4 is fixed by a stopper (not shown), the connecting portion 52a is reconnected to the connecting bracket 55b, and the pair of hydraulic jacks is reconnected. By 50, the reinforcing steel girder 4 is again moved by a predetermined stroke. As described above, the connection between the connecting portion 52a and the connecting brackets 55a to 55c is sequentially changed,
It is possible to move the reinforcing steel girder 4 at the bottom to the side.

Next, a method of assembling the reinforcing steel girders 4 and installing them at predetermined locations will be described. First, in the first step, as shown in FIG. 14, a pair of ring supports 10 along the inner surface of the tunnel are provided near the outer sides of both ends in the axial direction of the tunnel at the position where the reinforcing steel girders 4 are installed. A gantry 60 for assembling the reinforcing steel girder 4 is disposed therebetween. Next, as shown in FIG. 15, in a second step, the reinforcing steel girder 4 is assembled on the gantry 60, and then, in a third step, a plurality of rotations for restraining clockwise rotation in each ring support 10. The restricting member 21A and a plurality of rotation restricting members 21B for restricting the counterclockwise rotation are welded and set at the positions shown in FIG.
0 is rotationally constrained to the inner surface of the tunnel.

Next, in a fourth step, as shown in FIG. 16, the gantry 60 is supported with the both ends of the reinforcing steel girder 4 supported on the pair of ring supports 10 by a plurality of center hole jacks 30. At the same time as the removal, the reinforcing steel girder 4 is lowered to the bottom of the tunnel as shown in FIG. Then, as shown in FIG. 18, the hydraulic jack 50 is supported on the connecting piece 12 at the lower end of the ring support 10, and the reinforcing steel girder 4
Are driven in the circumferential direction along the inner surface of the tunnel by a plurality of hydraulic jacks 50 supported by a pair of ring supports and installed on the side surface of the inner surface of the tunnel. After that, the inner surface of the tunnel other than the reinforcing steel girder 4 is reinforced with mortar 4,
The inner surface of the tunnel corresponding to the introduction opening 4a of the reinforcing steel girder 4 is
The ductile segment 2 is partially removed to form an opening 2
a is formed, and as shown in FIG. 1, the connecting portion 3 is connected to the intake shaft 6 by the water pipe 7.

That is, according to the method for assembling and installing the heavy member in the tunnel and the supporting structure for installing the heavy member in the tunnel, the pair of ring supports 10 are provided along the inner surface of the tunnel. Is constrained on the inner surface of the tunnel by the rotation constraining structure 20, so that when the gantry 60 is removed and the reinforcing steel girder 4 is lowered to the bottom of the tunnel, the load on the reinforcing steel girder 4 is reduced by a pair of ring supports 1.
0 to disperse the steel girder in the lower part of the inner surface of the tunnel 4
When the reinforcing steel girder 4 is driven to move in the circumferential direction along the inner surface of the tunnel, the reinforcing steel girder 4 is supported via a pair of ring supports 10 that are rotationally restricted by the rotation restricting structure 20. The load is distributed to the inner surface of the tunnel, so that the reinforcing steel girder 4 can be reliably supported. Therefore, work safety can be ensured and work efficiency can be improved.

In addition, since the pair of ring supports 10 are provided along the inner surface of the tunnel, the working space in the tunnel is hardly restricted, and the reinforcing steel girder 4 is installed at a predetermined position on the inner surface of the tunnel. Even after the installation, it is not necessary to remove it almost without obstruction, so that the work load after installation can be reduced. Further, the plurality of locked portions 24 of the pair of ring supports 10 are respectively locked to the plurality of locking portions 9 on the inner surface of the tunnel via the elastically deformable buffer member 25, so that the pair of ring supports 10 are supported. Since the reinforcing steel girder 4 is rotationally constrained on the inner surface of the tunnel, when the reinforcing steel girder 4 is driven to move in the circumferential direction along the inner surface of the tunnel, the load of the reinforcing steel girder 4 is applied to the inner surface of the tunnel It can be surely distributed to the plurality of locking portions 9.

[0036]

According to the method of assembling and installing the weight member according to the first aspect of the present invention, a pair of ring supports along the inner surface of the tunnel are provided near the outer sides of both ends in the axial direction of the tunnel at the position where the weight member is installed. A first step of arranging a gantry for assembling the weight member during the second step; a second step of assembling the weight member on the gantry; and a second step of rotating and restraining a pair of ring supports on the inner surface of the tunnel before or after the second step. A fourth step of removing the gantry and lowering the weight member to the bottom of the tunnel in a state where both ends of the weight member are supported on a pair of ring supports by a plurality of lifting hydraulic jacks, and both ends of the weight member; Is driven in a circumferential direction along the inner surface of the tunnel by a plurality of hydraulic jacks supported by a pair of ring supports to be installed at a predetermined portion of the inner surface of the tunnel. Because with a, in the fourth step,
The load of the weight member is dispersed to the lower portion of the inner surface of the tunnel through a pair of ring supports, so that the weight member can be reliably supported.
Dispersed on the inner surface of the tunnel via a pair of ring supports,
The weight member can be reliably supported.

Accordingly, it is possible to secure work safety and to improve work efficiency. In addition, since the pair of ring supports are provided along the inner surface of the tunnel, the working space in the tunnel is hardly restricted, and after the weight member is installed at a predetermined position on the inner surface of the tunnel, it is almost in the way. It is not necessary to remove it, so that the work load after installation can be reduced.

According to the weight member assembling and mounting method of the second aspect, the same effect as that of the first aspect is obtained, but in the third step, the plurality of locked portions of each ring support is elastically deformable by the cushioning member. And a pair of ring supports are rotationally constrained to the inner surface of the tunnel through the plurality of locking portions of the inner surface of the tunnel, so that in the fifth step, the weight member is circumferentially moved along the inner surface of the tunnel. During the movement drive, the load of the weight member can be reliably dispersed to the plurality of locking portions on the inner surface of the tunnel through the elastic deformation of the cushioning member.

According to the method for assembling and installing the weight member according to the third aspect, the same effect as that of the second aspect can be obtained, but since the center hole jack is used as the lifting hydraulic jack,
The center hole jack makes it possible to easily, reliably and efficiently lift and lower the weight member.

According to the supporting structure for mounting the weight member in the tunnel according to the fourth aspect, a pair of rings disposed along the inner surface of the tunnel near the outside of both ends in the axial direction of the tunnel at the position where the weight member is mounted. A support, a rotation restricting structure for rotationally constraining these ring supports on the inner surface of the tunnel, a connecting piece fixed to each of the pair of ring supports, and provided with a connecting piece for connecting a hydraulic jack for moving and driving the weight member. Therefore, when the weight member is driven to move in the circumferential direction along the inner surface of the tunnel, the load of the weight member is dispersed to the inner surface of the tunnel via a pair of rotation-constrained ring supports to securely support the weight member. It is possible to secure work safety and improve work efficiency. In addition, since the pair of ring supports are provided along the inner surface of the tunnel, the working space in the tunnel is hardly restricted, and after the weight member is installed at a predetermined position on the inner surface of the tunnel, it is almost in the way. It is not necessary to remove it, so that the work load after installation can be reduced.

According to the supporting structure for mounting a heavy member in a tunnel according to the fifth aspect, the same effect as in the first aspect is obtained, but the rotation restraining structure includes a plurality of locking portions provided on the inner surface of the tunnel, A plurality of locked portions provided on each ring support and respectively locked by the plurality of locking portions; and a plurality of locked portions and locked portions provided between the locking portions and the locked portions of each set. An elastically deformable cushioning member fixed to one side is provided, so that when the weight member is driven to move in the circumferential direction along the tunnel inner surface, the load of the weight member is reduced through the elastic deformation of the buffer member. It can be reliably dispersed to a plurality of locking portions of the portion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a water storage tunnel and an intake shaft according to an embodiment of the present invention.

FIG. 2 is a perspective view of a connection portion of the water storage tunnel (when a reinforcing steel girder is raised and lowered).

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a perspective view of a connection part of the water storage tunnel (when a reinforcing steel girder is installed).

FIG. 5 is a view taken in the direction of arrows VV in FIG. 2;

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

FIG. 7 is a sectional view taken along line VII-VII of FIG. 5;

FIG. 8 is an explanatory diagram of a mounting position of a rotation restricting member.

FIG. 9 is an enlarged view of a main part of FIG. 7;

FIG. 10 is a perspective view of a rotation restricting member.

FIG. 11 is a perspective view of a center hole jack.

FIG. 12 is a sectional view of a center hole jack.

FIG. 13 is an enlarged view of a main part of FIG.

FIG. 14 is a longitudinal sectional view of a connection part (first step) of the water storage tunnel.

FIG. 15 is a longitudinal sectional view of a connection part (second and third steps) of the water storage tunnel.

FIG. 16 is a longitudinal sectional view of a connection part (fourth step) of the water storage tunnel.

FIG. 17 is a longitudinal sectional view of a connection part (fourth step) of the water storage tunnel.

FIG. 18 is a longitudinal sectional view of a connection part (fifth step) of the water storage tunnel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground water storage tunnel 4 Reinforced steel girder 9 Lock part 10 Ring support 11, 12, 55a-55c Connection piece 20 Rotation restraint structure 24 Locked part 25 Buffer member 30 Center hole jack 60 Stand

Claims (5)

(57) [Claims] 1. A method for assembling a weight member in a tunnel and then installing the weight member on a predetermined portion of the inner surface of the tunnel, comprising: a pair of ring supports along the inner surface of the tunnel near outer sides of both ends in the axial direction of the tunnel at a position where the weight member is installed. A first step of arranging a gantry for assembling the weight member between the ring supports, a second step of assembling the weight member on the gantry, and one before or after the second step. A third step of rotationally constraining the ring support to the inner surface of the tunnel, and removing the gantry while supporting both ends of the weight member above the pair of ring supports with a plurality of lifting hydraulic jacks. 4th lowering to the bottom of tunnel
And a fifth step in which both ends of the weight member are circumferentially moved and driven along the inner surface of the tunnel by a plurality of hydraulic jacks supported by a pair of ring supports to be installed at a predetermined portion of the inner surface of the tunnel. A method for assembling and installing a heavy member in a tunnel. 2. In the third step, a plurality of locked portions of each ring support is locked to a plurality of locking portions of an inner surface of the tunnel via an elastically deformable cushioning member, respectively. 2. The method for assembling and installing a heavy member in a tunnel according to claim 1, wherein the ring support is constrained to rotate on an inner surface of the tunnel. 3. The method according to claim 2, wherein a center hole jack is used as the lifting hydraulic jack. 4. A support structure for moving a weight member in a tunnel in a circumferential direction along an inner surface of the tunnel and mounting the weight member at a predetermined position, wherein the weight member is installed near a position outside the both ends of the tunnel in the axial direction of the tunnel. 1 arranged along the inner surface
A pair of ring supports, a rotation constraining structure for constraining the ring supports on the inner surface of the tunnel, and a connecting piece fixedly attached to the pair of ring supports for connecting a hydraulic jack for moving and driving the weight member. A connection structure for mounting a heavy member in a tunnel, comprising: 5. The rotation restraining structure includes a plurality of locking portions provided on an inner surface of the tunnel, and a plurality of locked portions provided on each ring support and locked by the plurality of locking portions, respectively. 5. The apparatus according to claim 4, further comprising an elastically deformable cushioning member provided between the locking portion and the locked portion of each set and fixed to one of the locking portion and the locked portion. Support structure for installing heavy members in a tunnel.