JPH09228792A - Lining method and device using bagged concrete in tunnel construction work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining method and device which require neither an end form for the natural ground nor a strong support device. SOLUTION: This lining method includes pressing bags 6 filled with concrete 17 against the excavated natural ground by means of air bags 4, and using the bagged concrete that is hardened directly. A lining device 3 for use in the lining method includes a circular frame 5 designed to expand and fold, a jack 7 mounted on the lower end of the circular frame 5, the air bags 4 installed on the outer periphery of the circular frame 5 at predetermined intervals, and the concrete-filled bags 6 placed on the outsides of the air bags 4. The use of the lining method and device eliminates the need for forms and end forms, enabling the use of a simple frame and reduction of the cost required for excavation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary lining method and apparatus for mountain tunnel construction, and more particularly to a lining method and apparatus using a bag-filled concrete for tunnel construction.

[0002]

2. Description of the Related Art In tunnel construction at NATM, when the excavated natural ground surface is first lined with concrete,
In the primary lining using a concrete sprayer or the like, a large amount of dust rises and material loss occurs due to rebound, so that the NTL method using a special form has been proposed in recent years. In this NTL method, a semicircular formwork is arranged near the inner peripheral surface of the excavated ground, and a concrete having fluidity and rapid hardening is placed in the gap between the formwork and the ground. It is a construction method in which the primary lining is performed by doing. In this NTL formwork method, a formwork that moves on an arc-shaped frame is installed so as to be in contact with the natural ground, and the concrete is placed by dividing it from the lower part to the top end several times. There is also.

[0003]

The NTL method is superior to the conventional concrete method by spraying in that it is more manoeuvrable and allows remote control of various lining equipment and has a good working environment. Has many. However, it requires a high degree of control and complicated operation of the equipment used, and the construction time is relatively long, and other work during that time is limited, or a gable form is required between the ground and the ground. There is a problem that it is difficult to form a reliable concrete because there is a limit to the familiarity with the natural ground.

The present invention has been made by paying attention to the above-mentioned problems and does not require a formwork or a gable formwork.
An object of the present invention is to provide a lining method and a device using a bag-filled concrete for tunnel construction that does not require a strong support device for lining the garment.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a lining method using a bag-filling concrete in tunnel construction, in which an uncured concrete is excavated in the ground. It is characterized in that it is a construction method in which a bag filled with a sheet is pressed and the concrete is cured as it is.

Further, a lining device using a bag-filling concrete in tunnel construction is a circular frame having a structure that can be expanded and folded, and a telescopic support device attached to both ends of the circular frame. (Jack) and the circular frame
And a pressure-supporting tool for the bag-filled concrete, which is installed on the outer periphery of the frame at a predetermined interval.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall side view of a state in which a lining method using a bag-filled concrete in the tunnel construction of the present invention is being performed.
FIG. 3 is a view taken along the line AA of FIG. 1, and FIG. 3 is a view showing a state in which the concrete filling bag is arranged on a pressing support provided on the outer circumference of a circular frame. The lining method of the present invention is provided with an arm 2 of a base machine 1 equipped with a concrete pump 20.
The lining device 3 attached to the tip portion is used. The lining device 3 includes a circular frame 5 having an expandable and foldable structure, expansion / contraction support devices (jacks) 7 attached to the left and right ends of the circular frame 5, and the circular frame 5. , And air bags 4, 4, ... Installed at predetermined intervals on the outer periphery of the bag, and an uncured concrete filling bag 6. The concrete filling bag 6 will be described later. It is arranged on the outside of the air bags 4, 4, ...

The circular frame 5 is constructed so that it can be folded in five (the number of divisions can be increased or decreased). That is, the circular frame 5 is composed of partial frames 5a,
It is composed of 5b, 5c, 5d and 5e. Also, turnbuckles 16, 16 are provided at the lower ends of the partial frames 5d and 5e.
Auxiliary frames 5f, 5f for rotating by are provided. Expansion support devices (jacks) 7, 7 are attached to the lower end of one partial frame 5d and the lower end of the other partial frame 5e, respectively, to support the load applied during lining. Further, between the partial frame 5b and the partial frame 5d and between the partial frame 5c and the partial frame 5
The hinges 10 and 10 are attached to the e, respectively, and rotatably connected, and these partial frames are expanded,
Cylinders 9 and 9 for contracting (hereinafter referred to as frame expanding / contracting cylinders 9 and 9) are attached. The frame expansion / contraction cylinders 9 and 9 are provided between the partial frame 5b and the partial frame 5d and between the partial frame 5c and the partial frame.
Each of them can rotate within a certain angle range with respect to the frame 5e. That is, during the primary lining, the frame expansion / contraction cylinder 9,
The partial frames 5d and 5e are expanded at 9 and contracted when moved. Further, the partial frame 5a and the partial frame 5b
Between this and between the partial frame 5a and the partial frame 5c, these partial frames 5b, 5c are structured so that they can be expanded and folded in the direction perpendicular to the paper surface. Will be described later.

Next, the partial frame 5 located at the center
A is connected to the end of the arm 2 of the base machine 1. That is, as shown in FIG. 4, the bracket 12 and the bracket 12 connected to the front portion of the partial frame 5a by the connecting rods 11, 11 (four).
The partial frame 5a and the arm 2 are rotatably connected to the side of the frame 2 by pin connection. Also, this partial frame 5a and the left and right partial frames 5b,
As shown in FIG. 5, it is rotatably connected to 5c so that it can be expanded and folded (the detailed configuration is omitted because it is an existing configuration). Further, a cylinder 13 is attached to the arm 2 so that the entire circular frame 5 can be pitched.

When the entire lining device 3 is moved, the circular frame 5 is folded, but first, the leg portions of the expansion and contraction support devices (jacks) 7 and 7 are contracted and the frame expansion and contraction cylinders 9 and 9 are arranged. Activate to activate partial frame 5b and partial frame 5
d, the partial frame 5c and the partial frame 5e are folded, and further, the partial frame 5a and the partial frame 5b and the partial frame 5a and the partial frame 5c are folded backward and then folded.・ Move as storage (Fig. 5 (A),
(B)).

The outer peripheral surface of the circular frame 5 is expanded by taking air in and out with an air compressor or the like,
The retractable airbags 4, 4, ... Are arranged at regular intervals in the circumferential direction. The air bags 4, 4, ... Are pressing supports for pressing a bag 6 filled with concrete, which will be described later, against the ground. The bag disposing device 8 is configured to reciprocate on the side surface of the circular frame 5 from one end to the other end, which will be described in detail later. Further, the bag 6 is an elongated bag for packing a concrete having a flat cross section, and the bag arranging device 8 is arranged above the airbags 4, 4, ... . It should be noted that the airbag 4 may be a single airbag that is long in the circumferential direction, or instead of the airbag 4, it may be an expanding and contracting pressing support such as a cylinder.

FIG. 6 is a front view of the bag disposing device 8,
FIG. 7 is a side view. The bag disposing device 8 includes a frame 8a.
And a roller attached to both ends of the frame 8a so as to rotate in contact with the side surface of the circular frame 5 (the side surface of the H-shaped steel flange portion) and the inner surface (the inner surface of the H-shaped steel flange portion).
Pinions 8 meshing with the racks 8b, 8c, a motor (geared motor) 8d attached to the central portion of the frame 8a, and a rack 5g attached to the side surface of the circular frame 5.
e and a gear 8f driven by the motor 8d and meshing with the pinion 8e. The rack 5g is a rack whose tooth surface is inclined, and therefore the rack 5g
If the pinion 8e and the gear 8f meshing with g are also bevel gears, the bag disposing device 8 can smoothly travel. The bag disposing device 8 disposes the bag 6 on the outer surface of the circular frame 5 while gripping the end portion of the bag 6 and traveling along the side surface of the circular frame 5 from one end to the other. Go.

The bag 6 is divided into a length of an arc from one end to the other end of the semicircular shape of the tunnel cross section in the circumferential direction, and at the center (per vertex of the circular frame 5). ) Is provided with a hole into which a nozzle 14 for concrete injection (see FIG. 1) is fitted, and is plugged after injection. The bag 6 for packing concrete is fed out from a drum reel 15 installed at one lower end of the circular frame 5, but if it is arranged around the circular frame 5, the drum reel 15 is provided. Le 1
5 is once removed. The operator installs and removes the drum reel 15.

The lining apparatus 3 for carrying out the lining method using the bag-filled concrete in the tunnel construction of the present invention has the above-mentioned structure. Follow the procedure below. (1) First, the expansion / contraction cylinders 9 are operated to stretch the entire circular frame 5. Next, while the bag disposing device 8 is running, the air bags 4, 4, ... On the outer periphery of the circular frame 5.
The bag 6 is placed on the outer surface of the bag, and this bag placement operation is performed at a safe position 5 to 10 m behind the face. (2) The entire lining device 3 is carried by the base machine 1 to the tip of the face as it is, and the lower auxiliary frames 5f, 5 are extended by the telescopic supports (jacks) 7, 7 and the turnbuckles 16, 16.
Tighten f and set. (3) After setting the lining device 3 on the face,
As shown in FIG. 5, the concrete pump 20 installed in the base machine 1 is driven to inject the concrete 17 into the concrete injection hole of the bag 6 from the nozzle 14 at the tip of the concrete hose 21. (4) At this time, the moisture in the concrete 17 exudes from the cloth of the bag, and as a result, a strong concrete is formed. It is more effective if pressure is applied at the time of concrete injection. When the injection is completed, the bag 6 is pressed against the natural ground side by a pressing support tool such as the airbag 4, 4, 4, ..., And the bag 6 is made to conform to it, and the concrete 17 is cured as it is. (5) Loosen the turnbuckles 16 and 16 to raise the auxiliary frames 5f and 5f, and further extend and retract the supporting device (jack) 7,
7 is loosened and the legs are raised, the partial frames 5b, 5d and 5d, 5e are folded by the expansion / contraction cylinders 9, 9, and further,
A cylinder (not shown) is operated to fold it as shown in FIG. 5 (B), and the lining device 3 is made to stand by on the road shoulder about 30 m behind the face. (6) After excavating the natural ground, the above operations (1) to (5) are repeated to perform the primary lining work of the tunnel.

[0015]

As described above in detail, according to the lining method and the apparatus using the bag-filling concrete in the tunnel construction of the present invention, the following excellent unique effects are obtained. (1) Since the concrete is poured into the bag stretched in the shape of a semicircle and the primary lining is carried out, the form and the gable form are not required, so the conventional N
A simpler frame can be used as compared with the TL method. Therefore, the cost required for excavation can be reduced accordingly. (2) When the packed concrete is cured, the water content in the concrete is removed at an early stage, so that a strong support can be obtained. (3) Since the bag itself filled with concrete is self-supporting,
There is no need for strong supports when placing concrete. (4) Since the filled concrete is pressed against the ground together with the bag, it is possible to form a stable primary lining layer that is compatible with the ground to some extent.

[Brief description of drawings]

FIG. 1 is an overall side view of a state in which a lining method using a bag-filled concrete in a tunnel construction of the present invention is carried out.

FIG. 2 is a view taken along the line AA in FIG. 1, showing a state in which a concrete-filling bag is filled with concrete and primary-coated.

FIG. 3 is a view taken along the line AA of FIG. 1, showing a state in which a concrete filling bag is arranged outside a pressing support provided on the outer circumference of a circular frame. .

FIG. 4 is a perspective view of a connecting portion between a circular frame and an arm of a base machine.

5A and 5B are conceptual diagrams when the circular frame is folded, in which FIG. 5A shows a state in which the circular frame is expanded and set, and FIG. 5B shows a folded state during movement. Indicates.

FIG. 6 is a front view of the bag disposing device used in the lining device of the present invention.

FIG. 7 is a side view of a bag disposing device used in the lining device of the present invention.

[Explanation of symbols]

 1 Base Machine 3 Lining Device 4 Air Bag (Pressing Support) 5 Circular Frame 5a to 5e Partial Frame 5f Auxiliary Frame 6 Concrete Filling Bag 7 Expansion Supporting Device (Jack) 8 Bags Arrangement device 9 Frame expansion / contraction cylinder 10 Hinge 14 Nozzle 15 Drum reel 16 Turnbuckle

Claims (2)

[Claims] 1. A lining method using a bag-filled concrete in tunnel construction, characterized in that a bag filled with uncured concrete is pressed against the excavated ground and the concrete is cured as it is. 2. A circular frame having a structure that can be expanded and folded, expansion / contraction supporting devices (jacks) attached to both ends of the circular frame, and a predetermined interval on the outer periphery of the circular frame. A lining device using a bag-filling concrete for tunnel construction, comprising: a press support device for the installed bag-filling concrete.