JPH0516317Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a shield excavator that connects underground tunnels excavated by two shield excavators facing each other.

(Prior Art) The shield excavation method is used as a tunnel excavation technique suitable for soft ground in cities, such as subway construction.

In this shield excavation method, a tunnel is excavated while assembling segments (bearing walls) that can withstand earth pressure and water pressure behind the excavator.

By the way, there is a limit to the distance that can be excavated with one shield tunneling machine (hereinafter simply referred to as tunneling machine), and in order to shorten the construction period, if the tunnel on land is long, it is necessary to excavate with one shield tunneling machine. A method was adopted in which shafts were installed as far apart as possible, and a tunnel excavator was used to excavate between the shafts. According to this method, it was possible to assemble segments normally, and the tunnels could be joined at the shafts.

However, in cases where it is not possible to establish a shaft as a relay point because a long submarine tunnel is being excavated or the ground above the tunnel is located in a crowded city, etc., two excavators may be used facing each other. A construction method has been proposed in which the tunnels are joined underground when both excavators reach the joining point.

In this way, when joining tunnels excavated by two tunneling machines underground, there is no way to assemble segments for the length of the two tunneling machines, and there is no possibility that groundwater will flow into the tunneling machines. In order to prevent the intrusion of dirt, sand, etc., once the excavator reaches the joint point, the ground at the joint point is frozen or a solidifying agent is injected into the ground to solidify the ground. An auxiliary construction method will be adopted.

For example, one of the two excavators digging oppositely toward a tunnel junction point is placed in front, and when it reaches the junction point and stops, the cutter disc is placed inside the skin plate (shield outer shell). inside), and solidifying agent is injected into the ground in front of the cutter disk to solidify it and prevent the ground from collapsing.In this state, the trailing excavator is brought close to the leading excavator and the cutter is The disc is inserted into the skin plate of the preceding excavator, and both cutter discs are placed in close proximity. After solidifying the solidifying agent in the cutter chamber and between both cutter discs, the excavation begins. The various devices and members inside the machine are dismantled and removed, after which the segments are assembled and concrete is poured as a tunnel wall to a predetermined thickness around the inner periphery to join the tunnel.

A tunnel joining method that employs an auxiliary method in which these two excavators are brought close to each other at the joining point, and in this state the ground at the joining point is frozen, or a solidifying agent is injected into the ground to solidify the ground. According to , after dismantling and removing various equipment and parts inside the machine, including the cutter disk, it is sufficient to remove only the amount of solidified ground necessary for tunnel connection, and depending on the ground, this auxiliary method may be used. Although some places require the application of this auxiliary method, it has the disadvantage of prolonging the construction period due to the time required to apply this auxiliary construction method.

Therefore, when the two tunneling machines reach the joining point and face each other, a cylindrical steel joining ring built into the tip of one tunneling machine is protruded and attached to the tip of the other tunneling machine. Insert it into the joint chamber prepared 2
A tunnel joining method has been proposed in which the base excavator is mechanically joined.

(Problem that the invention aims to solve) However, in order to mechanically join the two tunneling machines mentioned above at the tunnel joining point, it is necessary to dig a long tunnel underground from both sides.
It is necessary to precisely align the center of the base excavator at the tunnel junction point, and in addition to establishing accurate position measurement technology, the question is what is the permissible range of misalignment (misalignment)?

This idea was made in view of the above points, and in order to mechanically join two tunneling machines at the tunnel joint point, a shield tunneling machine is used that increases the tolerance range for positional deviation of both tunneling machines. The purpose is to provide.

(Means for solving the problem) The gist of this invention to solve the above purpose is to have two shield tunneling machines dig facing each other towards the tunnel joining point, and at the joining point. The tunnels on both sides are joined by mechanically connecting the tips of both shield tunneling machines, and a hood plate is connected to the tip of the skin plate constituting the outer shield shell of each of the two shield tunneling machines, A joining ring is arranged on the outside of the food plate so that it can move forward and backward, a spacer is interposed between the joining ring and the food plate by fixing it to the food plate, and tapered surfaces that fit into each other are formed at the tips of both joining rings. There is a shield excavator that is characterized by the following.

(Function) In the above configuration, according to this invention, the two tunneling machines are made to face each other toward the tunnel joining point, and when both tunneling machines are closest to each other, they are placed at the tips of both tunneling machines. When the attached joining ring is moved forward, at the beginning of the forward movement of the joining ring, the joining ring moves forward by sliding on the spacer that is interposed between the food plates on the outside of the food plate.
In the later stages of forward movement of the joining ring, the joining ring comes off from the spacer and floats from the shield outer shell side, and both joining rings approach each other under conditions where positional deviation (misalignment) is possible, resulting in a tapered surface. The tip formed on the top fits snugly.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

FIG. 1 is a side view of the main parts of the shield tunneling machines facing each other at the tunnel junction point of this invention.

In the figure, 1 is a cylindrical skin plate that constitutes the shield shell of two excavators A and B;
A food plate 2 is connected to the tip of the skin plate 1 and has a slightly smaller diameter than the skin plate 1. Reference numeral 3 denotes a joining ring disposed on the food plate 2 so as to be movable in the front-rear direction.The outer diameter is approximately the same as that of the skin plate 1, and the thickness is appropriate. The tapered surfaces 4 are formed with the inner and outer inclinations reversed so that they fit together while maintaining airtightness. 5 is a spacer interposed between the joining ring 3 and the food plate 2 at the rear of the joining ring 3, and is fixed to the food plate 2. When the joining ring 3 starts moving forward from the retreated standby position, the spacer 5 is inserted into the spacer 5. It has a sliding width. 6
is a seal ring interposed between the joining ring 3 and the end of the food plate 2 at the tip of the joining ring 3, and when the joining ring 3 is in the retracted standby position, the seal ring is inserted between the end of the joining ring 3 and the end of the food plate 2. It closes the gap between. Reference numeral 7 denotes a joint jack arranged between the skin plate 1 and the rear part of the joint ring 3 in the skin plate 1. Although the joint jacks 7 are not shown, a plurality of joint jacks 7 are arranged equidistantly in the circumferential direction of the joint ring 3. It is arranged.

Reference numeral 8 in the figure is a cutter disk for cutting the face that is commonly installed on the front surface of the cutter chamber for the two excavators A and B, and includes the drive mechanism of this cutter disk 8. , B is a well-known structure in which the shield jack excavates in such a manner that the segments assembled by the segment assembly device within the shield shell receive an excavation reaction force.

In the above configuration, the two excavators A and B are made to face each other and dig toward the tunnel junction point,
Both excavators A and B reach the joining point, come closest to each other, and stop. When the joint jacks 7 are extended in both excavators A and B, the joint ring 3 in the standby position shown in FIG. 1 starts to move forward, and immediately after the joint ring 3 starts moving forward, the joint ring The seal ring 6 interposed between the seal ring 3 and the tip of the food plate 2 comes off, and the joining ring 3 continues to move forward by sliding on the spacer 5 fixed to the food plate 2 at the beginning of the forward movement, but the joint ring 3 is joined in the middle of forward movement. The ring 3 comes off the spacer 5 and floats from the hood plate 2 in the latter half of the forward movement, that is, it is not constrained by the hood plate 2 and can be misaligned (misaligned) with the hood plate 2. Both joining rings 3 come close to each other, and finally, as shown in FIG. 2, the tips of both joining rings 3 are fitted together with their tapered surfaces 4 maintaining airtightness.

In this way, after the joint ring 3 has been fitted, various devices and members including the cutter disk 8 are dismantled and removed inside the excavators A and B, and the segments are assembled, leaving the joint ring 3. Concrete for the tunnel walls will be poured to a specified thickness to complete the tunnel connection work.

This invention is applicable to all types of shield excavators, such as mud water type shield excavators, earth pressure type shield excavators, and mud pressure type shield excavators.

(Effect) As explained above, according to this invention, in order to mechanically join two tunneling machines that have dug in opposite directions toward the tunnel junction point, the tips of both tunneling machines The joint ring that has been placed in advance is moved forward, and midway through this movement, the joint ring releases its restraint relationship with the shield outer shell side, and the tips of both joint rings are moved in a state that allows a relatively large positional deviation (misalignment). Since they fit together using tapered surfaces, when the two excavators arrive at the tunnel joining point, even if there is a slight positional shift, they can be mechanically joined without any effect and the tunnel joining work can be carried out accurately. The work can be carried out smoothly without any time lapse, shortening the construction period and improving economic efficiency.

[Brief explanation of the drawing]

Figure 1 is a side view of the main parts of the shield tunneling machine facing each other at the tunnel junction point;
The figure is a side view of the main parts with both joining rings in a fitted state. 1...Skin plate, 2...Food plate, 3...Joining ring, 4...Tapered surface, 5...
Spacer, 6... Seal ring, 7... Joining jack, 8... Cutter disk, A, B... Excavation machine.

Claims (1)

[Scope of utility model registration request] Two shield tunneling machines are made to tunnel facing each other toward a tunnel joining point, and the tips of both shield tunneling machines are mechanically connected at the joining point to join the tunnels on both sides. A hood plate is connected to the tip of the skin plate that constitutes each shield outer shell of the shield tunneling machine, a joining ring is arranged on the outside of the hood plate so as to be movable forward and backward, and is fixed to the hood plate between the joining ring and the hood plate. A shield excavator characterized in that a spacer is interposed therebetween, and tapered surfaces that fit into each other are formed at the tips of both joining rings.