JPH0220800A - Shield drilling machine - Google Patents

Abstract

PURPOSE:To aim at the certainty of the covering operation by providing the inside of a tail plate with a filling device for filling the space generated at the part lapped with an existing cover concrete by the movement of a tail plate generated by the propulsion of a drilling machine. CONSTITUTION:On the surface of a tail plate 2, a filler pipe 7 extending in its longitudinal direction and opening at the back end face is provided, and its front end part is connected to a pump 9 through a filling hose 8. A filler feeding device is also formed for feeding the filler such as grout into the filling pipe 7. The number and the place of the filling pipe 7 are determined according to the major diameter of a shield drilling machine, the filler is selected taking soil conditions, circumstances and operating conditions into consideration, and the type of pump 9 for force-feeding the filler is determined according to the kind of filler and operating conditions. The space in the natural ground can be thus filled with the filler securely.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shield excavator used for constructing tunnels by cast-in-place lining method.

(Prior art) When constructing an l-channel using cast-in-place lining,
Assembling the reinforcing bar basket and inner formwork inside the tail plate of the shield excavator at the tunnel Omukai excavated by the shield excavator,
Concrete lining is poured into the space formed outside the inner formwork, in front of the existing concrete lining, and between the press ring at the tip of the press jack mounted on the excavator, and the press jack is extended and poured. After the concrete is pressurized by the press ring and cured for the required time, the press jack is retracted and the press ring is pulled back to the excavator side, and the reinforcing bar basket and inner formwork for pouring the next lining concrete are assembled. Let's do it.

(Problems to be Solved by the Invention) In the conventional construction method, after curing the poured lining concrete, in order to assemble the reinforcing cage for the next lining concrete in front of it, the press ring is placed on the excavator side as described above. You have to pull back and release the wife side.

At this time, the tail plate of the shield excavator is wrapped around the existing concrete lining for the required length. This lap length is necessary to suppress the influence of earth pressure, water pressure, etc. on the lining concrete when releasing the gable.

A gap corresponding to the thickness of the tail plate is created in the lap part as the excavator moves, and depending on the size of the concrete coarse aggregate or the lap length, the gap may not be filled with the pressed concrete.

The present invention has been proposed in view of the problems of the prior art, and its purpose is to prevent the tail plate of the excavator from colliding with the existing lining concrete as the excavator moves forward. The object of the present invention is to provide a shield excavator that densely fills a lap part with a filler material to form a lining body that is in close contact with other piles.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the shield excavator according to the present invention has a shield excavator that prevents damage caused in the ground by the movement of the tail plate as the excavator moves. It is constructed by installing a filling device for the void.

The filling device includes a filler injection pipe that is disposed along the inside of the tail plate and opens at the rear end of the tail plate so as to reliably fill the gap with the filler;
and a filler supply source connected to the same injection pipe.

(Function) Since the shield excavator according to the present invention is configured as described above, after curing of the poured lining concrete is completed, the press ring is returned to the excavator side, and the press ring is placed next to the inside of the tail plate. The reinforcing bar basket and inner formwork for pouring concrete lining were assembled, concrete was poured, and the shield excavator began to move while pressurizing the concrete with a press ring. Filling material is supplied by a filling device, and the voids created in the lap between the tail plate and the existing lining concrete as the excavator moves are filled with the filler. It is filled with poured lining concrete that is pressurized by the ring.

(Example) The present invention will be described below with reference to the illustrated embodiments.

In Fig. 1, (1) is the main body of the shield excavator, (2) is the tail plate, (3) is the silt jack mounted on the main body (1), (4) is the ring girder at the tip of the shield jack, ( 5) is a press jack mounted on the main body (1), and (6) is a press ring at the tip of the press jack.

A filler injection tube (7) that extends along the longitudinal direction of the tail plate (2) and opens at the rear end surface is disposed on the inner surface of the tail plate (2).
The front end of the is connected via a filling hose (8) to a pump (9), which is further connected to a filler storage tank 0, which grouts the injection pipe (7). The hose (8), the pump (9), and the filler storage tank 00) constitute a filler supply device connected to the injection pipe (7). It is.

The number and arrangement of the filler injection pipes (7) are determined taking into account the outer diameter of the shield excavator, and the filler is determined based on soil conditions,
The pump (9) for pumping the filler is determined taking into consideration the environment, construction conditions, etc., and the pump (9) for pumping the filler is determined by taking into account the type of filler, construction conditions, etc.

Figures 4A to 4F show the tunnel construction process using the shield excavator, and Figure 4A shows the curing of the poured lining concrete, and the reinforcing cage and inner The press ring (6) is shown pulled back toward the excavator body for formwork assembly, and the tail plate (
2) is wrapped with the existing concrete lining (II). The middle part in the figure is the wrap part.

Next, assemble the reinforcing bar cage 02) and the inner formwork inside the tail plate (2) (see Figure 4B). Place lining concrete (10) in the space formed between the two. In the figure, 041 is a concrete pouring pipe. (See Figure 4C) Next, extend the shield jack (3) as shown in Figure 4D. Then, the shield excavator body starts to be propelled by taking a reaction force to the inner formwork a through the tip ring girder (4).The tail plate (2) moves as the excavator body is propelled in the ground. ) is filled with the filler θ injected from the rear end of the filler injection pipe (7) installed inside the tail plate (2) at the same time as the gap is generated. .

Figure 4E shows the state in which the shield excavator main body is being propelled and the tail plate (2) has pulled out the lap part with the existing concrete lining (11), and at this point the tail plate is in the ground. The part (2) is filled with filler θω. After this, the filler injection pipe (7)
The filling of the filler material is completed, and the voids in the ground created by the propulsion of the shield excavator body are subsequently filled with poured lining concrete (11) pressurized by the press ring (6).

Figure 4F shows the state in which the shield excavator has been propelled and the placed lining concrete has been pressurized, and the tail plate (2)
The voids generated in the ground due to the movement of the concrete are filled with pressurized poured lining concrete O1) at the same time as the voids are generated.

The above steps are then repeated to construct a cast-in-place lining tunnel.

Although the above-mentioned embodiments have shown the case where reinforcing bars are used as reinforcing materials for the lining, the present invention is not limited to such embodiments, and the present invention is also applicable to cases where other reinforcing materials are used, or reinforcing materials are also used. Applicable to all cast-in-place concrete lining construction methods, such as when not being used.

(Effects of the Invention) As described above, the shield excavator according to the present invention is equipped with a filling device inside the tail plate for filling voids generated in the ground due to movement of the tail plate as the excavator moves. Since it is possible to fill with filler at any time while the excavator is moving, a lining made of cast-in-place concrete that is in close contact with the ground can be reliably constructed.

In addition, the lap between the existing lining concrete and the tail plate can be reliably filled with the filling device, and the concrete pouring joints are also covered with the filler material, which improves the water-tightness of the concrete pouring joints. improves.

The invention according to claim 2 provides that the filling device includes a filler injection pipe that is disposed inside the tail plate of the shield excavator and opens at the rear end of the tail plate, and a filler supply device that is connected to the filler injection pipe. With this configuration, the voids in the ground can be reliably filled with the filler.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view showing the operating state of an embodiment of the shield excavator according to the present invention, FIG. 2 is a partially enlarged view thereof, and FIG.
The figure is an explanatory diagram showing an outline of the filling device, and Figures 48 to 4F are vertical sectional side views showing the process of constructing a tunnel by the shield excavator. (2) - Tail plate (7) - Filler injection pipe (8)
- Filling homa (9) - Pump 0 ports) - Filling material storage tank fan 2 m Agent Patent attorney Shige Okamoto 2 other people

Claims (1)

[Scope of Claims] 1. In a shield excavator for constructing tunnels with cast-in-place lining, inside the tail plate, as the tail plate moves as the excavator moves, it overlaps with the existing lining concrete. A shield excavator characterized by being equipped with a filling device for filling voids that occur. 2. Claim 1, wherein the filling device is arranged along the inside of the tail plate and includes a filler injection pipe that opens at the rear end of the tail plate, and a filler supply device connected to the injection pipe. The shield excavator described.