JPH055999B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a direct lining method for shield tunnels and an apparatus therefor.

(Conventional technology) In the conventional shield construction method, steel or concrete segments are assembled and joined in a ring shape at the tail of a shield excavator, and a reaction force is applied to the segments to perform shield excavation using a shield jack. Propelling the machine.

(Problems to be Solved by the Invention) However, since the segments are assembled into a ring shape by bolting the front, rear, left and right sides, assembly work requires skill, and since there are many joints, water leakage accidents often occur. In addition, there are many problems with the process because earth removal vehicles, segment transport vehicles, and segment assembly erectors are installed inside the excavation pit.

(Means for Solving the Problems) The present invention has been proposed to solve these problems, and includes a centrifugal concrete pipe forming formwork device built into the tail portion of a shield excavator. After pouring concrete for lining directly into the same formwork and forming a concrete hollow tube by centrifugal force forming, the hollow tube is installed on the inner peripheral surface of the tunnel hole formed as the shield excavator excavates. The present invention relates to a direct lining construction method for a shield tunnel, which is characterized in that the shield tunnel is crimped and jointed to an existing concrete hollow pipe, and the shield excavator is propelled by taking a reaction force to each of the concrete hollow pipes. In order to carry out the construction method smoothly, a rotating inner formwork that rotates along the inner circumferential surface of the tail part of the shield excavator body, and a rotating inner formwork that can be detached from the front and rear sides of the inner formwork are installed on the tail part of the shield excavator body. A propulsion device that includes a built-in centrifugal concrete pipe forming formwork device consisting of a side frame, and propels the excavator by taking a reaction force to the concrete hollow tube formed by the formwork device in the excavator main body. This invention proposes a direct lining device for shield tunnels, which is characterized by being equipped with jacks.

(Function) Since the present invention is configured as described above,
Instead of assembling segments in the tail section of a shield excavator as in the past, the lining concrete is placed directly into the centrifugal concrete pipe forming form device installed in the tail section of the shield excavator, and the lining concrete is then centrifugally formed. A high-strength, high-quality concrete hollow tube is formed, and the hollow tube is attached to the inner circumferential surface of the tunnel hole formed as the excavator excavates by a shield jack attached to the shield excavator body. The shield tunnel is constructed by crimping and joining the existing concrete hollow pipes, and propelling the shield excavator by applying a reaction force to each of the hollow pipes, and repeating the same process as described above. be.

(Effects of the Invention) As described above, according to the present invention, the direct cast concrete lining is constructed of a concrete hollow tube formed by a centrifugal concrete tube forming form device built in the tail portion of a shield excavator. This eliminates the need to assemble the segments, eliminates the need for complicated work for assembling the segments, and eliminates the need to arrange segment transport vehicles and segment assembly erectors in the excavation pit.

In addition, since the concrete hollow tubes that make up the direct cast concrete lining are formed using centrifugal force forming, the water content in the concrete is dehydrated.
Constructed of high-quality, high-strength concrete lining.

Furthermore, since the concrete hollow tube is formed by centrifugal force, it is not necessary to assemble the inner formwork when assembling the molding device for forming the hollow tube, which simplifies the work.

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

A is a shield excavator equipped with a cutting cutter 1 at the tip and a centrifugal concrete pipe forming formwork device attached to the shield tail 2.

1 and 5 show details of the same formwork device, 3 is a rotating inner formwork, which is rotatably mounted on the inner circumferential surface of the shield tail 2 via a bearing 4. Side frames 5 are detachably mounted on both the front and rear sides of the frame 3 as described later.

An annular rotation transmission gear 6 is mounted on the inner peripheral surface of the inner formwork 3, and teeth on the inner peripheral surface of the gear 6 are fixed to the drive shaft of a drive motor 7 mounted on the shield excavator main body. The inner formwork 3 is driven and rotated by the motor 7 via the respective gears 8 and 7.

In the figure, 9 is a side frame fixing part, which will be described later, and 10 is an earth discharge conveyor.

FIGS. 6 and 7 show details of the side frame fixing part, in which bolts 11 and nuts 12 for fixing the side frame are attached to one of the opposing end flanges of a pair of semicircular side frames 5. By screwing and pressing the other flange, the pair of side frames 5, 5 are expanded in the radial direction, and the side frames 5, 5 are crimped onto the inner circumferential surface of the rotating inner form 3. is fixed to the inner formwork 3, and the side frames 5, 5 are removed from the frame by screwing the bolt 11 in the opposite direction to release the pressing force against the other flange. .

In the figure, 13 is a gap holding plate between the same side frames 5, 5, and 14 is a gap holding plate fixing bolt.

After fixing the side frames 5, 5 to the rotating inner form 3, the required number of sheath pipes 15 through which steel rods for joining concrete hollow pipes are passed are passed between the opposing side frames 5, and the inner form 3 is fixed. Rebar 1 of the rebar cage placed inside
It ends in 6. In the figure, 17 is a spacer for the reinforcing bar 16. (See Figures 2 and 8.) The motor 7 drives and rotates the inner formwork 3 together with the side frame 5, and concrete is supplied into each formwork 3 and 5 via the concrete supply pipe 18. Concrete C is supplied and a concrete hollow pipe 19 is formed.

At this time, the thickness of the concrete hollow tube 19 to be formed is based on the height of the side frame 5. The finishing of the concrete surface is carried out by moving a bar-shaped trowel back and forth along the concrete surface while rotating the formwork.

The concrete hollow tube 19 formed by centrifugal force in this manner becomes a high-strength, high-quality hollow tube because water in the concrete is dehydrated by centrifugal force.

After the poured concrete has hardened and the required compressive strength is secured, the side frame 5 fixed to the rotating inner formwork 3 is removed by loosening the bolts 11. (See Fig. 3) The concrete hollow pipe 19 formed as described above is pressed by the shield jack 20 mounted on the shield excavator A, and the concrete hollow pipe 19 is pressed by the shield jack 20 mounted on the shield excavator A.
It is then removed from the mold and pressed into contact with an existing concrete hollow pipe 19' installed on the inner wall of the tunnel hole B formed as the shield excavator A excavates.

At this time, the steel rod 21 inserted into the sheath tube 15 of the hollow tubes 19, 19' is inserted into the coupler 22 before the hollow tubes 19, 19' come into contact with each other.
(See Fig. 9) Both hollow tubes 19,
A waterproof seal 23 is applied to the joint surface of the pipe 19', which is crimped with a shield jack 20 (see Fig. 10), and the joint steel bar 21 is tightened via a joint nut 24, and the steel bar 21 is attached to the hollow concrete pipe 19. ' to connect and fix both the hollow tubes 19, 19'.
(See FIG. 11) 25 in the figure is a bearing plate.

Next, the shield excavator A is propelled by applying a reaction force to the concrete hollow tubes 19, 19' by the shield jack 20, and the same steps as described above are repeated to line the shield tunnel.
(See Figure 4) Watertightness between the shield tail 2 and the concrete hollow pipe 19 during excavation by the shield excavator A is achieved by a tail gasket (not shown) attached to the shield tail 2. It is something that can be done. In the figure, 26 is a backfilling injection material.

According to the method of the illustrated embodiment, a shield excavator A
Built-in centrifugal concrete forming formwork device,
The concrete hollow pipe 19 constituting the lining concrete is directly cast and formed by the same device, and after the concrete hardens, the shield excavator A is propelled by applying a reaction force to the hollow pipe 19 to form the segment. Furthermore, by centrifugally forming the hollow tube 19, a high-strength, high-quality concrete lining is constructed, and an inner formwork for forming the concrete hollow tube is no longer necessary. be.

[Brief explanation of the drawing]

1 to 4 are longitudinal sectional side views showing steps of an embodiment of the direct lining construction method for shield tunnels according to the present invention, FIG. 5 is a front view of FIG. 1, and FIG. 6 is a front view of FIG.
Figures 7 and 7 are a vertical side view and a front view showing the side frame fixing part, Figure 8 is a vertical side view showing the reinforcing bar and sheath pipe attachment part, and Figures 9 to 11 are concrete hollow pipes. FIG. A...Shield excavator, B...Tunnel hole, C
...Concrete, 2...Shield Tail, 3...
... Rotation inner formwork, 5 ... Side frame, 6 ... Rotation transmission gear, 7 ... Drive motor, 8 ... Drive gear, 11
... Bolt, 12 ... Nut, 15 ... Sheath pipe, 18 ... Concrete supply pipe, 19 ... Concrete hollow pipe, 19' ... Existing concrete hollow pipe, 20 ... Shield jack, 21 ... ...Steel rod, 22...Coupler.

Claims (1)

[Scope of Claims] 1. A centrifugal concrete pipe forming form device is built into the tail portion of the shield excavator, and lining concrete is directly poured into the form device to form a concrete hollow pipe by centrifugal forming. After that, the hollow tubes were crimped and spliced to the existing concrete hollow tubes installed on the inner circumferential surface of the tunnel hole formed by the excavation of the shield excavator, and a reaction force was applied to each of the concrete hollow tubes. A direct lining construction method for a shield tunnel characterized by propelling the shield excavator. 2. A centrifugal concrete pipe consisting of a rotating inner formwork that rotates along the inner peripheral surface of the tail part of the shield excavator body, and side frames that are detachably installed on both the front and rear sides of the inner formwork. In addition to having a built-in forming formwork device, the excavator body is equipped with a propulsion jack that propels the excavator by taking a reaction force to the concrete hollow tube formed by the formwork device. Direct lining equipment for shield tunnels.