JPH0510095A - Gable form device in concrete lining of tunnel - Google Patents

Abstract

PURPOSE:To prevent an outflow of concrete from a gable part executing a concrete lining to an excavated wall surface and to place concrete surely. CONSTITUTION:A rail frame 2 having a form smaller than the circumferential surface of a section of a tunnel and capable of folding is provided to the front end of a boom capable of elevation and expansion provided forward of a self traveling truck. A form movable guide rail 4 is set along the rail frame, and a form 65 moving in the direction of the radius of the section of the tunnel on the rail 4 is so provided that it is capable of self-traveling. A plurality of cylinders are adjoined in a radial direction to the form 65. And, at the same time, retractable frames moving in a separable direction against bedrock of the tunnel through operation of the cylinders are provided to them, and elastic bodies are arranged to the surface opposed to the bedrock of the retractable frames. Air bulkheads bearing placed concrete pressure at the rears of the elastic bodies are provided to the retractable frames.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to tunnel construction.
The present invention relates to a gable formwork device that prevents concrete from flowing out from the gable portion and surely pours concrete when performing concrete lining on the excavated wall surface.

[0002]

2. Description of the Related Art In conventional tunnel construction by NATM, a primary lining is carried out by excavating to a required cross-sectional shape and supporting the rock mass. This concrete primary lining is performed by spraying concrete on the excavated rock mass. This is to dry mix or wet mix the sprayed material, pressurize the inside of the hose with compressed air, etc., add pressurized water or a quick-setting agent near the nozzle, and spray it toward the natural ground for lining.
However, in this method, when concrete is sprayed on the ground with high pressure, dust adhering to the ground rises up due to this concrete spraying pressure, or the sprayed material bounces off the ground and dust is generated, creating a work environment. It has become worse and there are pollution problems such as pneumoconiosis. In addition, material loss occurs due to splashing of the sprayed material. In order to solve such a defect, a method of directly crimping and covering concrete with a formwork on the ground has been proposed. For example, JP-A-63-17
1998, JP-A-2-96097, JP-A 1-18
The one disclosed in Japanese Patent No. 7294 has been proposed.

[0003]

However, in the above-mentioned construction method, when placing concrete along the ground surface of the tunnel, it is necessary to close the end portion of the formwork. For this reason, in the one disclosed in the above-mentioned publication, a tube is arranged in the mold gable portion, and at the time of placing concrete, the tube is inflated and grounded to the ground. Therefore, in order to support the concrete pouring pressure only with the bulging pressure of the tube, it is necessary to increase the internal pressure of the tube, but if the internal pressure is increased, the contact with the uneven surface of the ground will become poor and a gap will be created. Concrete flows out. On the contrary, if the internal pressure of the tube is lowered,
The contact is good along the uneven surface of the ground, but it cannot support the pouring concrete pressure.

Further, as disclosed in Japanese Patent Laid-Open No. 1-187294, the gable form is made into a small width piece, and the gutter form is made to appear and disappear according to the unevenness of the natural ground, so that the unevenness of the natural ground is accurately obtained. It cannot fit along the surface, resulting in a small gap. Furthermore, there is a risk that the concrete may enter the gap between the small width pieces and cause malfunction.

According to the present invention, a plurality of projecting and retracting mechanisms are arranged in the radial direction at the end of the mold, and the projecting and retracting mechanism ensures that the elastic copying material is aligned with the uneven surface of the ground without any gaps, and the elastic copying material is provided on the back surface of the elastic copying material. The purpose of the present invention is to support the concrete pouring pressure by the bulging body provided and to completely prevent the lining concrete from flowing out.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, in which a plurality of cylinders are radially adjacent to a movable partial formwork having an arc shape of the formwork. , Each cylinder is equipped with a retractable frame that moves in the direction of contact with and away from the ground of the tunnel by the operation of this cylinder, and an elastic body is arranged on the surface facing the ground of each retractable frame. The gist of the present invention is to form a gable form by providing an air bulkhead on the back of the elastic body and supporting the pouring concrete pressure.

[0007]

[Operation] The elastic body is pressed along the uneven surface of the ground by the operation of the cylinders that are arranged adjacent to each other in the radial direction to the partial formwork guided by the guide rail along the design lining shape. A mold is constructed at the side edge of the mold. For this reason, the end portion of the formwork is pressed against the elastic body by the operation of this cylinder without any gap between the elastic body and the uneven surface of the natural ground, and the air on the back surface of the elastic body is pressed. Since the back of the elastic body is firmly supported by the bulge of the bulkhead,
Even if concrete is poured along the ground, the gable formwork is firmly supported and concrete can be poured accurately.

[0008]

EXAMPLE A concrete lining device for a tunnel according to the present invention will be described below with reference to the illustrated example. In the figure, reference numeral 1 denotes a traveling carriage having an outrigger AR at a lower portion thereof, and a carriage body 1A of the traveling carriage 1 is capable of turning as required, and the carriage body 1A is provided with a boom 1B which can be lifted and lowered. It should be noted that the boom 1B is not only lifted but can be expanded and contracted as needed, and the boom 1B may be a single type, a double type, or a parallelogram link type. At the tip of the boom 1B, a rail frame 2 having an arcuate surface with a small diameter preset from the arcuate section of the excavated tunnel is supported.

The rail frame 2 is formed by connecting a plurality of pieces by pin joints so that the rail frame 2 can be laterally folded by a hydraulic cylinder, and at the center thereof, swings left and right to the boom 1B via a connecting fitting 3 and is raised and lowered. Also, the front and rear can be moved and connected. Then, the guide rail 4 is arranged along the outer peripheral surface of the rail frame 2 having the arc shape. Therefore, when the rail frame 2 is formed into an arc shape as shown in FIG. 7, the guide rails 4 are formed so as to be spaced apart from each other by a preset distance in the ground G of the tunnel.

When the rail frame 2 is formed into an arc shape in the excavation tunnel, the loads applied to the rail frame 2 are supported by the supporting devices 5.5 provided at both ends of the guide rail 4.

As described above, since the guide rail 4 is integrally provided on the rail frame 2 and the rail frame is bendable by the cylinder provided in the member pivot portion, it can be bent at a predetermined position in the tunnel as shown in FIG. The shape of the bird should be like a bird with its wings spread during concrete lining and the shape of a bird with its wings folded so that it can be made as small as possible so that it does not hinder the work during blasting work or sliding work. be able to.

The guide rail 4 is provided with two movable formwork devices 6, one on the left and one on the left, as shown in FIG. The movement of the formwork device 6 is performed by a pinion provided on the device 6 and a pin rack provided on the guide rail side, but a drive system other than this rack and pinion system is also adopted. The movable mold frame device 6 includes a moving frame 61 and a motor 6 for moving.
2 is provided with a pinion 63, and the motor 62
The pinion 63 meshed with the pin rack 41 is driven by a forward / reverse selection system via a power transmission mechanism.

Further, one or two or more, for example, four telescopic jack devices 64 as shown in the drawing support an arc-shaped frame 65 on the moving frame 61. This telescopic jack device 64 locks the lower end of the cylinder on the moving frame 61, and the mold 6 is attached to the tip of the rod of this cylinder.
5 is locked. As a result, the form frame 65 can be moved toward and away from the tunnel surface by the expansion and contraction of the expansion and contraction jack 64, and the load is supported by the cylinder in the direction perpendicular to the tunnel inner peripheral surface and the load in the horizontal direction during concrete lining. At the time of lining and concrete lining, project the formwork at a predetermined distance from the inner surface of the tunnel, and at the time of demolding,
Although the cylinder is reduced in size, a form supporting method other than this telescopic jack is also adopted.

The moving frame 61 is in contact with the outer peripheral surface of the guide rail 4 so as to be saddle-loaded on the guide rail 4, and a load receiving roller 66 for supporting the load during concrete lining,
In order to prevent the guide rail from being disengaged, a plurality of disengagement prevention rollers 67 that contact the lower surface of the upper guide rail and a plurality of steady rest rollers 68 that contact the upper surface of the guide rail to prevent shake are provided. A guide rail is held by these wheel rollers, and the movable frame can be moved by driving the pinion along the arc-shaped guide rail without coming off.

A gable formwork device 7 is provided at one end of the formwork 65 along the longitudinal direction thereof. This wife formwork device 7 is shown in FIG.
As shown in FIG. 3 in detail, a plurality of cylinders 71.71 are arranged in the mold frame 65 at required intervals in the radial direction, and a retractable frame 72 is provided in each cylinder 71. Elastic body 73 such as sponge
Is integrally provided, and an air bulkhead 74 for supporting is provided on the back surface of the elastic body 73.

The cylinder 71 is fixed to the retractable frame 72, and the rod 75 of this cylinder is locked to a bracket 76 protruding from the form frame 65, whereby the cylinder side is moved by the cylinder operation together with the fixed retractable frame. It is what makes me. The retractable frame 72 is provided for each cylinder, is arranged along the longitudinal direction of the mold 65, and connects the top side and the bottom side of each cylinder with pipes.

A long elastic body 73 is integrally provided by pasting or the like so as to connect the adjoining retractable frames 72.72. The elastic body 73 is made of sponge, and mainly uses the closed-cell body 73a, which is extremely easily deformed on the surface, that is, the side in contact with the ground, and the open-cell body 73b is integrated so as to conform to the uneven surface of the ground. It is a double body.

The air bulkhead 74 is a retractable frame 7
It is arranged at the side end of 2 and along the back surface of the elastic body 73, and one or plural pieces are provided over the entire length of the elastic body 73.

As shown in FIG. 2, a water leakage prevention packing 77 is provided by sticking or the like on the circular ridge at one end along the longitudinal direction of the form 65. The water leakage prevention packing 77 is made of a closed-cell sponge, and prevents the concrete from leaking from the gap between the projecting and retracting frame 72 and the elastic body 73 in the mold frame 65 when the concrete is covered.

An operation of lining concrete in a tunnel excavated by using the apparatus configured as described above will be described. In the excavation method, the truck 1 is moved to a predetermined position on the excavated tunnel floor, preferably the center of the tunnel, and stopped at a fixed position. The rail frame 2 is folded so that the guide rail or the like does not come into contact with the excavated inner peripheral wall surface of the tunnel during traveling of the carriage 1 so as to be low in bulk. Then, when stopped at a fixed position, each cylinder is driven to extend the rail frame 2 and expand the rail frame 2 in an arc shape so as to follow the required tunnel sectional shape, and the supporting device 5.5 is grounded to support the guide rail 4. At this time, the cylinders for yawing, elevation and the like are operated to move and adjust the guide rails to a predetermined horizontal position so that the guide rails are accurately arranged along the sectional shape of the tunnel.

Next, the movable frame 61 is lowered to the floor position along the guide rails, and the telescopic jack 64 is operated to adjust the form 65 to the inner peripheral surface of the tunnel to a thickness for concrete lining. To fix. When the cylinder 71 is operated to press the elastic body 73 against the natural ground G, the ground contact surface of the elastic body 73 is deformed so as to follow the uneven surface of the natural ground G, and follows the uneven ground surface properly. This state is shown in FIG. Therefore, the protrusion amount of the cylinder is small in the convex portion of the natural ground and is large in the concave portion. Next, the air bulkhead 74 is bulged to support the back surface of the elastic body, and then concrete is placed in the gap between the form 65 and the ground G.

After the cast concrete has hardened, the air bulkhead 74 is squeezed and the cylinder 71 is retracted to separate the gable form from the ground and reduce the expansion jack to release the mold. The form length in the circumferential direction is set to one pitch, and the moving frame is moved by the drive of the pinion along the guide rail only for this one pitch and stopped at a fixed position.

Next, by operating the telescopic jack, the mold is again projected to the fixed position, and the end mold is also projected to perform concrete lining. By repeating this operation, concrete is sequentially placed from the floor of the inner surface of the tunnel to the inner top surface. After completing the concrete lining for only the width of the formwork in this way, then retract the telescopic jack and remove it from the mold, and move this formwork device along the guide rails to a position that does not interfere with the folding of the railframe. After that, the rail frame is folded in the lateral direction to reduce the bulkiness in the width direction and to save.

In this way, when lining the concrete below the maximum width floor surface of the tunnel, one side is operated at a time.

[0025]

According to the present invention, a plurality of cylinders are radially arranged adjacent to one end of the moving frame of the formwork which is guided and guided by the guide rails along the inner surface shape of the tunnel ground. A movable deformable gable formwork consisting of an elastic body and an air bulkhead on the back of the elastic body is integrally provided in the provided retractable frame, so that concrete leak from the end portion of the formwork is prevented and the tunnel It has the advantage that concrete lining can be performed step by step.

[Brief description of drawings]

FIG. 1 is a front view showing a gable formwork apparatus according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view of the gable formwork apparatus.

FIG. 3 is a side view of FIG.

FIG. 4 is a front view showing the entire form of the mold in the device of the present invention.

FIG. 5 is an explanatory view of the gable form of the present invention before operation.

FIG. 6 is an explanatory diagram of the same operation.

FIG. 7 is a front view showing a state in which the entire device is installed in an excavation tunnel hole.

FIG. 8 is a side view of the same.

[Explanation of symbols]

1 traveling carriage 2 rail frame 3 connection metal fittings 4 guide rails 6 Formwork device 61 Moving frame 65 formwork 7 Wife formwork device 71 cylinders 72 Haunting frame 73 Elastic body 74 Air Bulkhead

Claims (4)

[Claims] 1. In a concrete lining for tunnel construction, the tip of a boom that can be lifted and retracted attached to the front of a self-propelled bogie has an arc shape smaller than the inner peripheral surface of the arc cross section of the tunnel. Also, a foldable rail frame was attached, a guide rail for moving the formwork was set along this, and a formwork part that was movable on the rail in the radial direction of the tunnel cross section was provided for self-propelling. −
In the lining device, a plurality of cylinders are radially adjacent to the movable mold part of the mold, which is formed in an arc shape, and the cylinders are actuated to move toward and away from the ground of the tunnel. An air bulkhead that equips each cylinder with a moving sunk frame, and has an elastic body on the surface facing the ground of each sunk frame, and that the sunk frame is on the back of the elastic body and supports the pouring concrete pressure. A gable formwork device in a concrete lining of a tunnel, characterized in that the gable formwork is provided by providing the gable formwork. 2. An elastic body arranged so as to connect between the appearing and disappearing frames provided in each cylinder is pressed against the uneven surface of the comings and goings frame by the pressing force against the comings and goings of the comings and goings frame which is projected by the operation of each cylinder. The spout in the concrete lining of the tunnel according to claim 1, wherein the sponge having an independent cell structure having a required thickness so as to be deformed and pressed against each other is integrated with the sponge having an open cell structure which is easily deformed on the ground contact surface side. Formwork device. 3. A plurality of cylinders radially adjacent to a movable partial formwork having an arc shape are divided into a top side and a bottom side, respectively, and adjusted and piped together. Gable formwork equipment for concrete lining of tunnels. 4. The air bulkhead provided on the back surface of the elastic body is provided on the retractable frame and adjacent to the back surface of the elastic body, and is expanded between the back surface of the elastic body and the ground by supplying air. 2. The concrete lining for a tunnel according to claim 1, wherein the pressure of the cast concrete applied to the elastic body is supported by the ground through an air bulkhead to prevent the cast concrete from flowing out to the gable side. Wife formwork equipment in.