JPH08177395A - Lining concrete compaction device for tunnel construction method - Google Patents

Abstract

PURPOSE: To facilitate compaction work by forming a compaction device out of a guide rail and a slide travel mechanism laid so as to be faced to each other via the insertion hole of a form used for tunnel lining, a seat and an excitation member. CONSTITUTION: A hydraulic motor 7 is secured to a bracket 6 and the rack 14 of a seat 8 having an excitation member 9 is made to gear with a pinion 12. Also, a guide roller 15 is kept in contact with a guide rail 5 and a stopper 18 is set to make preparations for a compaction work. Then, lining concrete 3 is placed in space between the skin plate la of a tunnel lining form 1 and a tunnel interior surface 2, and a motor 7 is driven to rotate. Also, the member 9 is inserted in the concrete 3 from the insertion hole 4 of the form 1 and made to advance and retreat. At the same time, the member 9 is driven to vibrate, thereby compacting the concrete 3. According to this construction, a compaction work is carried out approximately automatically after installing a compaction device 20 in the form 1, thereby allowing an easy work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compacting device for lining concrete in a tunnel construction method, and more particularly to a lining placed between the outer side of the tunnel lining frame and the inner wall surface of the tunnel. The present invention relates to a lining concrete compacting device for compacting concrete.

[0002]

2. Description of the Related Art Inside a tunnel formed by a shield machine, a tunnel boring machine or other various tunnel machines, or a tunnel such as a mountain tunnel, the inner wall surfaces of these tunnels are protected. In order to secure a predetermined cross-sectional shape, lining concrete is cast and formed to cover the inner wall surface of the tunnel. In order to cast and form these lining concrete, a formwork for tunnel lining has been conventionally used. That is, according to this tunnel lining form, the lining form is assembled inside the tunnel inner wall surface along the planned cross-sectional shape of the tunnel, and the outer side of the assembled form, that is, the form. By placing lining concrete in the space between the surface of the frame and the inner wall surface of the tunnel, it is possible to form a lining body having a predetermined shape that covers the inner wall surface of the tunnel.

On the other hand, in order to form such lining concrete with good quality, the concrete to be poured is filled into the space between the formwork and the inner wall surface of the tunnel without any gap, and
It is necessary to fully compact the filled concrete,
Therefore, in order to densely fill the concrete in the narrow space sandwiched between the formwork and the inner wall surface of the tunnel,
Conventionally, for example, a method of compacting concrete placed using a vibrator such as a vibrator has been adopted.

As a compaction method using the vibrator, for example, a worker manually inserts the vibrator into the concrete in the casting space from an inspection window provided at each position of the mold to apply vibration. A method, a method of attaching a vibrator with a self-oscillating motor to the surface of the inner side of the tunnel of the formwork, giving high-frequency vibration to this formwork, and indirectly vibrating the concrete through the formwork to consolidate Has been adopted.

[0005]

However, in these conventional methods, in the method of inserting the vibrator into the concrete in the casting space through the inspection window, the portion that cannot be reached from the inspection window when the cross section of the tunnel is large. May not be able to fully compact the concrete,
Further, when the cross section of the tunnel is small, there is a problem that an inspection window cannot be installed and it may be difficult for a worker to perform manual work.

Further, in the method of attaching a vibrator to the surface of the mold to vibrate, when the rigidity of the mold is high or the thickness of the lining is large, the vibration of the vibrator is not sufficiently transmitted to the concrete and There was a problem that the consolidation work could not be performed effectively.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and in particular, even when the thickness of the lining is large and the rigidity of the form is high, the size of the tunnel cross section is small. First, while reducing the manual work by workers,
An object of the present invention is to provide a compacting device for lining concrete in a tunnel construction method, which enables easy and effective compaction work.

[0008]

The present invention has been made in order to achieve such an object, and its gist is to provide an insertion hole formed in a tunnel lining frame and the tunnel lining mold. A guide rail and a slide moving mechanism that are arranged to face the inside of the tunnel of the frame and face each other through the insertion hole, and move forward and backward in the radial direction of the tunnel along the guide rail by driving the slide moving mechanism. The pedestal and the pedestal projecting outward from the pedestal in the radial direction of the tunnel to be inserted into the insertion hole, and driven between the outer side of the tunnel lining frame and the inner wall surface of the tunnel. A lining concrete compacting device in a tunnel construction method, comprising: a vibrating member that appears in and out of the covered lining concrete.

Further, in the compacting device for lining concrete in the tunneling method of the present invention, by fixing the vibrating member to a support plate and attaching the support plate to the pedestal via an elastic member, It is preferable that the vibration member is provided so as to project from the pedestal.

[0010]

According to the compacting device for lining concrete in the tunnel construction method of the present invention, the vibrating member projecting from the pedestal toward the radial outside of the tunnel is guided by the reciprocating mechanism. While moving along the rail in the radial direction of the tunnel and deeply immersing in the thickness direction of the lining concrete to fully compact the concrete, it is pre-installed on the tunnel lining formwork and vibrated through the insertion hole. Since the member is automatically inserted into and out of the concrete,
It eliminates the need for inspection windows and significantly reduces manual work by workers.

Further, by fixing the vibrating member to the support plate and attaching the support plate to the pedestal through the elastic member, it is possible to prevent the vibration of the vibrating member from being transmitted to the pedestal as much as possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a case where a compacting device 20 according to the present invention is installed in a concrete lining formwork 1 used in a cast-in-place lining shield method. In addition,
As is well known, in the cast-in-place lining shield method, a formwork 1 for lining concrete is assembled into a cylindrical shape inside the rear part of a shield excavator (not shown), and the skin plate 1a forming the formwork 1 is excavated from the outside of the tunnel. The lining concrete 3 is placed in the space formed between the inner wall surface 2 of the tunnel and the jack arranged at the rear of the shield machine, and the lining concrete 3 is inserted through the press ring.
Is a construction method of constructing a shield tunnel by forming a lining body in which the lining concrete 3 is continuous by performing the excavation work while pushing the shield advancing machine with its reaction force. After solidification, the mold 1 is disassembled and reused again as a mold for lining concrete.

The compacting device 20 of the present invention mounted on the above mold 1 has an insertion hole 4 formed at an appropriate position of the skin plate 1a and a skin plate 1a sandwiching the insertion hole 4. For example, a steel plate for detachably attaching the guide rail 5 that is vertically protruded and fixed to the inner side of the tunnel by welding or the like and is made of, for example, angle steel or groove steel, and the reciprocating hydraulic motor 7 that constitutes the slide movement mechanism 21. A bracket 6 made up of the above, and one end of which is connected to the hydraulic motor 7 and the other end of which is guided up and down along the guide rail 5 so as to move forward and backward in the tunnel radial direction toward the skin plate 1a side. Pedestal 8
And the above-mentioned insertion hole 4 while projecting on this pedestal 8.
And a rod-shaped vibrating member 9 which is inserted into the skin plate 1a and projects to the outside of the skin plate 1a.

A thrust bearing is provided on the inner side of the tunnel of the skin plate 1a and around the insertion hole 4 so that the sliding contact with the vibrating member 9 is good and the watertightness is maintained. 10 are welded together, and the seal ring 1 is provided on the inner periphery thereof, that is, on the sliding contact surface side with the vibrating member 9.
1 is provided.

At the time when the compacting work is completed, the vibrating member 9 and the like are arranged so as to be flush with the surface of the skin plate 1a, but the hydraulic motor 7, the pedestal 8 and the vibrating member 9 are removed. It is also possible to do this, and when these are removed, the thrust bearing portion 10 is closed by a packing plug or the like not shown.

A rack 14 that meshes with a pinion 12 provided on the drive shaft of the hydraulic motor 7 is provided at one end side of the pedestal 8 which is connected to the hydraulic motor 7 in a direction perpendicular to the pedestal 8. And a guide roller 15 that rolls along the guide rail 5 is fixed to the other end of the pedestal 8 through the engagement of the pinion 12 and the rack 14 by driving the hydraulic motor 7. You can move back and forth in the direction. The hydraulic motor 7, the pinion 12, and the rack 14 constitute the slide movement mechanism 21 of this embodiment.

The vibrating member 9 is formed of a cylindrical rod member having a diameter of about 5 cm, and is provided with an exciting mechanism such as a self-exciting motor type for exciting inside, and vibrates at a high frequency by driving the exciting mechanism. is there.

The oscillating member 9 has a support plate 17 fixed to one end thereof, and the support plate 17 is attached to the pedestal 8 via a pair of vibration isolating rubbers 16 as elastic members, so that the pedestal It is installed protrudingly on 8. An opening 22 is formed in the central portion of the pedestal 8, and the inside end of the tunnel of the vibration oscillating member 9 is inserted into the opening 22 so that the vibration oscillating member 9 does not come into contact with the pedestal 8. It has become. A stopper 18 is arranged at the lower end of the guide rail 5 to prevent the pedestal 8 from falling off after being set.

According to the compacting device 20 of this embodiment having the above-mentioned structure, the hydraulic motor 7 is fixed to the bracket 6, the rack 14 of the pedestal 8 to which the vibrating member 9 is attached is meshed with the pinion 12, and The guide roller 15 is brought into contact with the guide rail 5, and then the stopper 18 is set to complete the preparation for the compaction work.

The compaction device 20 is shown in FIG.
As shown in (b) and (b), compaction work can be performed effectively by providing one or more locations in the circumferential direction of the tunnel of the lining formwork 1 and multiple locations in the axial direction of the tunnel. .

When the lining concrete 3 is placed in the space formed between the skin plate 1a of the formwork 1 and the tunnel inner wall surface 2, the hydraulic motor 7 is driven to rotate,
The vibrating member 9 attached to the pedestal 8 is inserted into the concrete 3 placed through the insertion hole 4 and is moved forward and backward, and at the same time, the vibrating member 9 is driven and vibrated to compact the concrete 3. . It should be noted that the adjustment of the projecting / retracting amount can be easily performed by adjusting the reciprocating driving amount of the hydraulic motor 7 according to the distance d between the skin plate 1a and the tunnel inner wall surface, that is, the thickness of the lining concrete 3 and the like. You can

In this compaction work, the vibrating member 9 can be deeply immersed in the thickness direction of the lining concrete 3 by moving the pedestal 8 forward and backward in the tunnel radial direction. Even if the thickness of 3 is large, concrete is sufficiently compacted, and after the compaction device 20 is installed in the tunnel lining form 1, compaction work is performed almost automatically without manual work. be able to.

When the compacting work is completed, the stopper 18 can be removed from the guide rail 7 to remove the pedestal 8 together with the oscillating member 9 from the set position, or the hydraulic motor 7 can be continuously removed from the bracket 6. You can
The removed hydraulic motor 7, pedestal 8 or vibrating member 9 can be diverted by being installed on the mold 1 of the next span.

In this embodiment, the vibrating member 9 is provided with an exciting mechanism to generate high frequency vibration by itself. However, for example, by vibrating the support plate 17, it indirectly generates vibration. It may be.

Further, in this embodiment, the compacting device of the present invention is mounted on the concrete lining formwork used for the cast-in-place lining shield method, but the present invention is not limited to this. It can be installed in a lining concrete formwork for tunnels excavated and formed by various tunnel excavators such as shield excavators and tunnel boring machines, and all kinds of tunnels such as mountain tunnels.

[0027]

As described in detail above, according to the compacting device for lining concrete in the tunnel construction method according to the present invention, the vibrating member projecting from the pedestal toward the outside in the radial direction of the tunnel is provided. By driving the reciprocating mechanism,
While moving along the guide rail in the radial direction of the tunnel, the concrete is sufficiently compacted by deeply immersing it in the thickness direction of the lining concrete through the insertion hole. That is, even when the thickness of the lining concrete is large and the rigidity of the formwork is high, regardless of the size of the tunnel cross section, it is possible to easily and effectively tighten the concrete while reducing the manual work by workers. Can be hardened.

Further, by fixing the vibrating member to the support plate and attaching the support plate to the pedestal via the elastic member, it is possible to prevent the vibration of the vibrating member from being transmitted to the pedestal as much as possible.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a case where a compaction device according to the present invention is installed in a concrete lining formwork used in a cast-in-place lining shield method.

2A and 2B are explanatory views showing an arrangement state of a compaction device on a lining mold, FIG. 2A is a horizontal sectional view, and FIG. 2B is a vertical sectional view.

[Explanation of symbols]

 1 Formwork 1a Skin Plate 3 Lining Concrete 4 Insertion Hole 5 Guide Rail 6 Bracket 7 Reciprocating Hydraulic Motor (Slide Moving Mechanism) 8 Pedestal 9 Exciting Member 12 Pinion (Slide Moving Mechanism) 14 Rack (Slide Moving Mechanism) 17 Support Plate 20 Compaction device 21 Slide movement mechanism

Claims (2)

[Claims] 1. An insertion hole formed in a tunnel lining form frame, a guide rail projecting inward of the tunnel lining form frame, and a guide rail disposed opposite to each other across the insertion hole. A slide movement mechanism, a pedestal that moves forward and backward in the radial direction of the tunnel along the guide rail by driving the slide movement mechanism, and the insertion hole formed by protruding from the pedestal toward the radial outside of the tunnel. And a oscillating member that appears and disappears in the lining concrete that is inserted between the tunnel outer side of the tunnel lining form and the inner wall surface of the tunnel. Compactor for working concrete. 2. The vibrating member is fixed to a support plate, and the vibrating member is projected from the pedestal by attaching the support plate to the pedestal via an elastic member. Item 2. A compacting device for lining concrete in the tunnel construction method according to Item 1.