JP2868663B2 - Docking dock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shield method,
It relates to the structure of a part where one sinus docks with another sinus.

[0002]

[Prior art]

[Background of the Invention] It is easily expected that large-diameter, high-depth shielding methods will increase in the future as part of effective utilization of underground space. In the case of the shield method, it is conceivable that a shaft is docked in the main cave or a sub-cave is docked in the main cave. In, the diameter of the opening part of the shield machine launch arrival reaches large,
In addition, since the pressure from the ground side exerted on this part also increases, it is a problem how to prevent the collapse from the ground side into the cave when the shield machine is started.

[0003] Conventionally, the surrounding wall of the tunnel is made of a steel wall or a reinforced concrete layer. When the shield machine is started, the steel wall or the reinforcing bar near the starting entrance of the surrounding wall is cut and the concrete layer is broken. Mirror cuts have been applied to open the wellhead and prevent interference with the arrival of the shield machine. However, when opening the wellhead, a ground around the wellhead was used to prevent collapse from the ground side into the cave. The mountain side was frozen (freezing work), and a ground hardening agent was injected and hardened (chemical liquid injection work) to stabilize the ground and provide a water stopping means.

[0004]

However, in the above-mentioned freezing work, although the ground on the ground side can be stabilized, the construction time is long and the cost for freezing is considerably high. In addition, the ground stabilization is not uniform, the reliability is low, and there is a danger of flooding and ground collapse in chemical injection. Furthermore, in the above-mentioned mirror cutting work, noise,
Along with a decrease in work efficiency and a deterioration in work environment, there are many problems in safety construction management, and such problems are becoming more serious with the use of a shield method with a large depth and a large diameter.

[0005]

According to the present invention, as a means for solving the above-mentioned conventional problems, an arch-shaped material made of a brittle material is used near a tunnel entrance (4) of a tunnel (1), a peripheral wall (2), and at which a shield machine starts. The present invention provides a structure of a docking portion of a canal (1) formed by a concrete layer (5) reinforced by a plurality of thin ribs (6) and having a cylindrical partition (8) inserted therein.

[0006]

According to the present invention, a concrete layer reinforced by a plurality of arched thin ribs made of brittle material (6) is provided in the vicinity of a tunnel entrance (4) where the shield machine starts on the canal (1) peripheral wall (2).
The rib (6) antagonizes the earth pressure and the water pressure applied from the ground (15) side. When the shield machine (14) starts to arrive, the shield machine (14) is attached to the peripheral wall of the wellhead (4).
While cutting (2), the vehicle starts from or enters the cave (1). At this time, the peripheral wall (2) of the wellhead (4)
Is formed by a concrete layer (5) reinforced by a plurality of ribs (6) made of brittle material, so no mirror cutting work is required, and the shield machine (14) can leave the concrete layer (5) and Cut the rib (6). Even if the concrete layer (5) is cut, the collapse and intrusion of earth and sand or groundwater from the ground (15) side into the cave (1) is prevented by the cylindrical partition (8).

[0007]

Therefore, in the present invention, it is not necessary to perform a mirror-cutting work at the entrance of the tunnel wall to reach the start of the shield machine, so that noise, deterioration of the work environment and reduction of work efficiency are prevented, and freezing work and the like are prevented. There is no need to perform chemical injection, which shortens and simplifies construction and reduces costs.
In addition, a high degree of reliability for safety is obtained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIGS. 1 to 4. (1) is a main sinus road, and the peripheral wall of the main sinus road (1)
(2) is a segment made of reinforced concrete or steel
(3). Around the entrance (4) of the shield machine on the segment (3) of the peripheral wall (2) of the main sinus road (1) is glass fiber reinforced plastic (FRP), polyphenylene oxide, polyphenylene sulfide, polyarylate, polycarbonate, polymethacrylate, By using a plurality of arched thin ribs (6) made of plastics such as polystyrene, alumina, zirconia, carborundum, ceramics, glass, ceramic materials such as dehydroceramics, hard and brittle materials such as cast iron, and therefore easily cut by a shield machine. Consists of a reinforced concrete layer (5).

Further, a steel reinforcing segment (7) is disposed inside the segment (3) of the wellhead (4) portion, and a steel cylindrical partition (8) is provided inside the wellhead (4) portion. ) Is inserted. The inside of the cylindrical partition (8) is filled with earth and sand, foam mortar, mud, and the like (9), and a plurality of spaces are provided between the cylindrical partition (8) and the reinforcing segment (7). Step reinforcement ribs (10) are provided.

The cylindrical partition (8) is assembled immediately before the shield machine (14) reaches the wellhead (4) before reaching the shield machine (14). At this time, the part immediately below the pit (4) of the reinforcement segment (7) should be removed. The filling (9) of the cylindrical partition (8) is performed through the filling hole (8) A of the cylindrical partition (8).

After assembling the cylindrical bulkhead (8) and filling it in the above manner (9) in this way, as shown in FIG. Reach the arrival port (4) of 1). At this time, the shield machine (14)
(5) is cut and reaches the inside of the cylindrical bulkhead (8) as shown in Fig. 4, but the rib (6) of the concrete layer (5) is made of a hard and brittle material, so it is cut by the shield machine (14). Is easy. The peripheral wall (12) of the shaft (11) is composed of a large number of segments (13) made of concrete or steel, and the propulsive force of the shield machine (14) is received by the segments (13).

In this way, the shield machine (14) is
Although it reaches the inside of the cylindrical bulkhead (8) of (1), if the soil and groundwater fall into the main cave (1) from the ground (15) side, the middle packing (9) is applied. It is blocked and blocked by the cylindrical partition (8).

As described above, in this embodiment, there is no need for a mirror cutting work, a freezing work, and a chemical liquid injection work, and the docking of the main cave (1) and the shaft (11) is performed safely and with good workability.
After the shield machine (14) arrives, water stoppage treatment (16) is applied to the outer periphery of the tunnel (4) of the main cave (1), the cylindrical bulkhead (8) is dismantled, and the shield machine (14) is installed. Dismantle.

FIG. 5 shows a case where the shield machine (14) is started from inside the main sinus road (1). In this case a cylindrical bulkhead
In (8), of course, the filling (9) is not performed, and the shielding hole (8) for the worker to go in and out of the cylindrical bulkhead (8) for starting work is inserted into the cylindrical bulkhead (8). ). The shield machine (14) cuts the concrete layer (5) and ribs (6) and starts from the wellhead (4) in the same manner as in the previous embodiment. Collapse and intrusion into the main sinus passage (1) are blocked and prevented by the cylindrical partition (8).

[0015]

[Brief description of the drawings]

 1 to 4 show one embodiment of the present invention.

FIG. 1 is an explanatory cross-sectional view of a state before reaching a shield machine.

FIG. 2 is a cross-sectional view around the entrance of the main cave.

FIG. 3 is a partially cutaway plan view near the entrance of the main cave.

FIG. 4 is an explanatory cross-sectional view of a state after reaching a shield machine.

FIG. 5 is an explanatory cross-sectional view in the case of starting a shield machine.

[Explanation of symbols]

 1 Main Cave 2 Perimeter wall 4 Wellhead 5 Concrete layer 6 Arched thin rib 8 Cylindrical bulkhead

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-176093 (JP, A) JP-A-5-113095 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 301 E21D 5/04

Claims (1)

(57) [Claims] The present invention is characterized in that the vicinity of the entrance of the shield machine on the peripheral wall of the tunnel is formed by a concrete layer reinforced by a plurality of arched thin ribs made of a brittle material, and a cylindrical partition is inserted inside. The structure of the docking part of the cave