JPH0828190A - Cast-in-place lining shield construction method and shield excavating machine - Google Patents

Abstract

PURPOSE:To form lining concrete of good quality by improving a filling property of concrete in the neighbourhood of a skin plate easy to lower its filling property. CONSTITUTION:A plural number of exciting members 6 are arranged on a rear end edge of a skin plate 2 of a shield drilling machine 1 along its peripheral direction under a spot depositing lining shield engineering method to deposit concrete C in a concrete depositing space 20 formed between a tunnel inner peripheral surface 10 and a formwork 4 by way of setting the formwork 4 along the inner peripheral surface 10 of a tunnel in the rear of the shield drilling machine 1 while drilling the tunnel by the shield drilling machine 1. The concrete C in the neighbourhood of the skin plate 2 is compacted by oscillating the exciting members 6 by a motor 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete placing space formed between a formwork installed behind a shield machine and an inner peripheral surface of the tunnel while the tunnel machine is excavating the tunnel. The present invention relates to a cast-in-place lining shield construction method and a shield excavator for placing concrete.

[0002]

2. Description of the Related Art A cast-in-place lining shield method is formed between a tunnel inner peripheral surface formed by excavation and a formwork installed along the tunnel inner peripheral surface at the same time when a tunnel is excavated by a shield machine. It is a method to form a lining by placing concrete in the concrete placing space and pressing the placed concrete under high pressure, which does not require a backfilling injection step compared to conventional construction methods. There is no ground collapse due to the tail void, and a high-strength and uniform lining structure can be obtained by high-pressure pressing.

In this construction method, the reaction force required for the forward movement of the shield machine is obtained from the concrete cast in the casting space, whereby the high-pressure pressing of the concrete is performed. That is, the skin plate is moved forward while applying a compressive force to the concrete by the thrust of the propulsion jack via the press ring provided at the tip of the concrete placing surface. After that, the propelling jack is reduced to remove the press pressure, the formwork and the press ring are set again between the rear end of the advanced skin plate and the cast concrete, and the concrete is poured again. Repeat the seal and advance of the excavator and high-pressure press work.

[0004]

In this construction method, in order to increase the driving length in one operation, the jack stroke should be long.
In this case, the filling property of concrete is lowered.

However, if the press pressure is increased to improve the filling property, water will escape from the cast concrete, etc., so that the sufficient filling property cannot be obtained.

Particularly, the place where the filling property is deteriorated is a place far from the concrete pouring port, a place between the skin plate and the tip of the existing concrete, which is in contact with the ground, and this place is also It is a joint with the existing concrete lining, and if the filling property is poor, groundwater etc. will flow through this part into the mine, causing unexpected accidents and work stagnation.

Therefore, the present invention has been made to solve the above problems, and it is possible to form a lining concrete of high quality by enhancing the filling property of concrete in the vicinity of the skin plate where the filling property is likely to decrease. It is intended to provide a cast-in-place lining shield method and a shield machine.

[0008]

In order to achieve such an object, the cast-in-place lining method of the present invention is a method of excavating a tunnel by a shield machine, and behind the shield machine, along the inner peripheral surface of the tunnel. In a cast-in-place lining shield construction method in which concrete is placed in the concrete placing space formed between the inner peripheral surface of the tunnel and the form, after the skin plate of the shield machine. A plurality of vibrating members are arranged along the circumferential direction at the edge, and the concrete near the skin plate is compacted by the vibration of the vibrating members.

Further, a shield machine according to another aspect of the invention has a body of a machine that moves forward while excavating a tunnel while cutting the ground by directly contacting a cutting face with a face of a face, and a machine behind the body of the machine. A shield comprising a formwork installed along the inner peripheral surface of the tunnel, and a cast-in-place lining means for placing concrete in a concrete placing space formed between the formwork and the inner peripheral surface of the tunnel. In the excavator, the cast-in-place lining means is provided at a rear end edge of the skin plate of the excavator main body, and includes a vibrating member that is protruded into the concrete placing space. To do.

[0010]

According to the cast-in-place lining shield method and the shield machine according to the present invention, the vibrating member arranged at the rear end edge of the skin plate of the machine allows concrete between the inner circumferential surface of the tunnel and the formwork. Since the concrete placed in the casting space is vibrated, the vibrating member vibrates in the vicinity of the skin plate of the shield machine to obtain a compacting effect. Can be packed and packed.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial side sectional view showing a rear end portion of a skin plate 2 of a shield machine 1 in an enlarged manner, showing a construction state of a cast-in-place lining shield construction method according to this embodiment, and FIG. It is a cross-sectional view of the rear part of the plate.

In FIG. 1, a shield machine 1 is for cutting a ground by directly contacting a cutting blade (not shown) with a face of a cutting face to move forward to excavate a tunnel. A plurality of propulsion jacks 3 extending rearward are provided on the inner peripheral portion. A mold 4 having a length corresponding to the stroke length of the propulsion jack 3 is assembled on the inner periphery of the rear portion of the skin plate 2 for each span.

The shield machine 1 includes the mold 4 and
A concrete placing space 2 formed by the inner peripheral surface 10 of the excavated tunnel and the inner peripheral surface of the skin plate 2.
0 is provided with a concrete placing pipe 9 as a lining means for placing concrete C, and a press ring 5 connected to the jack 3 is provided between the skin plate 2 and the tip of the formwork 4. Is equipped with. And
The shield machine 1 advances by receiving a reaction force from the concrete C while applying a compressive force to the concrete C via the press ring 5 by the thrust of the propulsion jack 3.

Further, a rear end edge of the skin plate 2 is extended rearward to extend into the concrete placing space 2
One end of the vibrating member 6 projecting in 0 is fixed. Four vibrating members 6 are installed along the inner peripheral surface of the skin plate at predetermined intervals in the circumferential direction (see FIG. 2).

The vibrating member 6 is a spatula-shaped vibrating plate, that is, a vibrator for compaction, and is arranged on the inner periphery of the skin plate 2 at a predetermined distance apart from the fixing position of the jack 3. , Is connected to a motor 8 fixed to the inner periphery of the skin plate 2 via a vibration transmitting sleeve 7 penetrating the press ring 5, and vibrates as a compaction vibrator by driving the motor 8.

It should be noted that in FIG.
Although the case where four units are provided at intervals of 0 ° is shown, the number can be appropriately set according to the diameter of the skin plate 2 or the driving force per one of the vibrating members 6.

In the cast-in-place lining shield construction method using the shield machine 1 having the above-mentioned structure, concrete C is poured through the concrete placing pipe 9 after setting the most advanced formwork 4 as shown in FIG. By doing so, the concrete C flows backward while being sequentially filled from the outer lower portion of the form 4, and spills into the entire concrete placing space 20.

Then, the concrete 8 flowing around the vibrating member 6 is compacted by the vibration by driving the motor 8 to vibrate the vibrating member 6 in a state where the concrete C is wrapped around each part. As a result of flowing in the direction of an arrow while seeking a new void while being sealed, the tunnel inner peripheral surface 10 near the skin plate 2 that advances with the excavation of the shield machine 1 is closely packed and compacted. It is possible to obtain a solid and high-quality lining concrete which is continuous with the lining concrete C ′.

In the above embodiment, one end of the vibrating member 6 is fixed to the inner peripheral side of the skin plate 2, but it may be fixed to the outer peripheral side as shown in FIG. 3 (a), or (b). Needless to say, it may be embedded and fixed in the center in the thickness direction as shown in FIG.

[0020]

As described above in detail with reference to the embodiments, in the cast-in-place lining shield method and shield excavator according to the present invention, a plurality of ridges are formed at the rear edge of the skin plate along the circumferential direction thereof. Since the vibrating member is arranged and the concrete behind the skin plate is compacted and filled by the vibration of the vibrating member, a compacting effect due to the vibration of the vibrating member is obtained in the vicinity of the skin plate. The concrete near the skin plate can also be densely formed to easily obtain high quality lining concrete.

Further, even if the stroke length of the propulsion jack is long, the concrete can be sufficiently compacted. Therefore, the work efficiency is improved by increasing the length of the concrete lining formed in one operation. You can

[Brief description of drawings]

FIG. 1 is a partial side sectional view showing an embodiment of a cast-in-place lining shield construction method to which the present invention is applied.

FIG. 2 is a cross-sectional view showing how the vibrating member is arranged inside the skin plate.

3 (a) and 3 (b) are partial side cross-sectional views showing another embodiment of the method of attaching the vibration generating member to the skin plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield machine 2 Skin plate 4 Formwork 6 Exciting member 9 Concrete placing pipe (lining means) 10 Tunnel inner peripheral surface 20 Concrete placing space C Concrete

Claims (2)

[Claims] 1. A formwork is installed along the inner peripheral surface of the tunnel behind the shield machine while excavating the tunnel with the shield machine, and between the inner peripheral surface of the tunnel and the formwork. In the cast-in-place lining shield construction method for placing concrete in the concrete placing space formed in, in the rear end edge of the skin plate of the shield machine, a plurality of exciter members are arranged along the circumferential direction, A cast-in-place lining shield method characterized in that concrete in the vicinity of the skin plate is compacted by vibrating a vibrating member. 2. An excavator main body that moves forward while excavating a tunnel while cutting the ground by directly bringing a cutting blade into contact with the face of the face, and behind the excavator main body along the inner peripheral surface of the tunnel. In a shield machine comprising a formwork and a cast-in-place lining means for placing concrete in a concrete placing space formed between the formwork and the inner circumferential surface of the tunnel, A shield machine, wherein the lining means is provided at a rear end edge of the skin plate of the machine body, and includes a vibrating member protruding in large numbers into the concrete placing space.