JPS63879Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a material lock used in the pressure shield method.

In conventional pressure shield construction methods, the material lock is generally installed on the atmospheric side of the tunnel, separated by a bulkhead. Once the bulkhead is set, moving it involves a great deal of economic and time loss, so the standard setup required for tunnel excavation is usually used to set the bulkhead in a position where it can be carried out until the final stage of the work. It is. Initial propulsion of the shield is to advance the shield to a position where a series of standard setups can be performed, but since excavation is carried out under no-pressure conditions, the entire cross-section of the tunnel must be ground-improved along the entire initial excavation section. Currently, construction is being carried out over several stages.

The material lock of this invention installs a minimum number of locks on the pressure side separated by a bulkhead at a predetermined position in the tunnel, and as the excavation progresses,
By adding additional locks, it is possible to smoothly transition from the initial excavation to the main excavation.This greatly shortens the ground improvement required during the initial excavation, and also shortens the construction period.

In order to solve the above-mentioned conventional problems, the inventor developed a pneumatic shield construction method that improved the method of installing material locks.

This invention aims to provide a material lock suitable for use in the developed pneumatic shielding method.

First, to explain the pneumatic shield construction method using the material lock of this invention, it consists of a horizontal cylinder with a diameter smaller than the diameter of the tunnel connecting end locks 2 and 3 each having an entrance and exit with an airtight door 1. A mold material lock 8 is fixed to the bulkhead 4 at the end of the end lock 2 on the entrance/exit side and installed on the pressure side within the tunnel 5. Then, initial excavation is performed using the shield 6 while pressurizing the inside of the tunnel 5.

After completion of cutting, the structural members, which will become the intermediate lock 7 of vertical quarter structure when connected and assembled in the circumferential direction, are conveyed to the pressure side through the material lock, as shown in Fig. 3. While assembling the intermediate lock 7, the end lock 3 is disconnected and separated from the end lock 2, and then the intermediate lock 7 is installed between the end locks 2, 3 and these locks 2, 3, 7 are connected. Using the material lock obtained in this way, the main excavation begins. As shown in Figure 1, intermediate lock 7 was added using the same procedure as above as the main excavation progressed.
Continue the main excavation using the material lock 8 obtained by this. FIGS. 2A, B, and C show enlarged views of the front, left and right sides of this material lock 8.

The end lock 2 is equipped with an airtight door 1 at the end on the entrance/exit side, as well as a pressure gauge for determining the pressure inside the lock and the tunnel, and a pressure adjustment device inside the lock, and a rail 9 is installed at the inner bottom. In addition, the end lock 3 has an airtight door 1 and a rail 1 at the inner bottom.
0 is set. These end locks 2,
3 are connected by bolts of inward flanges provided at the end of each tunnel direction, and the rails 9,
It is possible to make 10 consecutively.

This invention is a horizontal cylindrical material lock for main excavation using the above-mentioned shield method, whose middle part is unitized into one or more intermediate locks 7 that adopt a vertical quarter assembly structure, and whose bottom part constitutes a unit. Piece 1
1. The left and right side pieces 12 and the top piece 13 are formed in a size that allows the air to be conveyed to the pressure side through the lock inlet. Note that two or three intermediate locks 7 are connected to each other in order to maintain airtightness and ensure sufficient space for carrying in materials into the tunnel and carrying out shedding.

To explain the material lock of this invention in more detail in FIGS. 4 to 8, the bottom piece 11, the left and right side pieces 12, and the top piece 13 are a body plate 1 curved in the lock circumferential direction.
1 reinforcing ribs 15 in the circumferential direction are welded at predetermined intervals on the inner surface of the
and a seventh inward flange 17 at the circumferential end.
As shown in the figure, bolt holes 18 are provided in these flanges 16 and 17, and a circumferential projecting piece 19 is provided on the outer surface of the circumferential end, and the inner surface of the bottom piece 11 is provided with a circumferential projecting piece 19. A rail 21 is installed using a frame 20.

The intermediate lock 7 is constructed by bolting the flanges 17, 17 which face the constituent pieces 11, 12 and 12, 13 together, and, as shown in FIG. It is assembled by attaching a connecting piece 22 to each and fastening them with bolts, and for the other intermediate locks 7 and end locks 2 and 3, the rails 9, 10, and 21 are connected and the flanges facing each other are assembled. (Only one of them, 16, is shown) is connected by bolting them together.

The reason why this intermediate lock 7 is made into vertical quarters is to allow it to be carried into the pressure side through the lock inlet, and to facilitate assembly on the pressure side.
Therefore, if it can be carried in, it may have a vertical three-part structure (in this case, it will be easier to assemble).
Of course, if the assembly time is not an issue, a vertically divided structure may be used.

In addition, the components of the intermediate lock 7 and the other intermediate locks 7 and the end locks 2 and 3 were connected by means of flange joints, but the grooves 23 as shown in FIG. 8 were formed to connect the locks. Of course, welding may be performed from within.

As mentioned above, this invention consists of one unit or two or more units connected in the tunnel direction in the middle part of the material lock having a diameter smaller than the tunnel diameter.
Since the unit has a vertically divided assembly structure and its constituent pieces are sized to be transported through the lock entrance, it can be reliably used for the pneumatic shield method in which a material lock is installed on the pneumatic side and main excavation is carried out. The practical application of this construction method can be guaranteed, and since it is possible to install a small material lock fixed to the bulkhead without bearing support for carrying in materials or carrying out shear within the tunnel, it is possible to install the material lock when installing the material lock. This makes it possible to save money and save on the installation effort, making it highly economical.The smaller lock also makes it possible to maintain sufficient airtightness inside the tunnel.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the state of shield main excavation using the material lock of this invention, and Figure 2 is a diagram showing the state of shield main excavation using the material lock of this invention.
In the enlarged view of the material lock in the figure, A is a front view;
B and C are left and right side views, Fig. 3 is a schematic perspective view of an intermediate lock made of the same material, Figs. 4 and 5 are longitudinal cross-sectional views and side views of the same intermediate lock, and Fig. 6 is Fig. 5. FIG. 7 is a sectional view showing the welding structure of the flange and body plate of the intermediate lock, and FIG. 8 is a sectional view showing the structure of the weld groove.

Claims (1)

[Scope of utility model registration request] A horizontal cylindrical material lock 8 having a diameter smaller than the diameter of the tunnel formed by connecting end locks 2 and 3, each having an entrance/exit with an airtight door 1, is fixed to the bulkhead 4 at the end of the end lock 2 on the entrance/exit side. The horizontal cylindrical material lock 8 is unitized into one or more intermediate locks 7 whose middle part adopts a vertically divided assembly structure, and the vertical part of the unit is A material lock for use in a pressurized air shield method, characterized in that the split component pieces are formed in a size that allows them to be transported to the pressurized side through the airtight door 1.