JPH0826742B2 - Joining method and joining device for shield excavator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator joining method and joining apparatus for joining shield bodies facing each other at through portions of a tunnel excavated from two directions.

(Prior art) As a tunnel excavation method using a shield excavator, in order to shorten the construction period, excavation is started from two directions by two shield excavation bases, and finally the shield body that faces each other at the junction of the tunnel. A joining method is known in which the two are connected to each other to complete the tunnel.

In this joining method, the cutter head, which is rotatably provided in the front part of the shield body and is used for excavating the natural ground, is disassembled and collected just before the tunnel penetrates. At this time, a space twice the length of the cutter head is created. It occurs between each shield body,
Since this space may cause the ground to collapse or flood water, conventionally, as shown in FIG. 8, a large number of freezing tubes c are radially arranged diagonally forward from the outer peripheral portions of the shield bodies a and b facing each other. Frozen soil is created around the cutter head d by projecting these freezing pipes c, and the cutter head d is divided while preventing collapse of the natural ground and flooding by the frozen soil, and the shield body a,
The method of collecting from inside b is adopted.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional method, it takes a lot of time and cost to radially place a large number of freezing tubes c, and it is necessary to create frozen soil in a wide range. It was uneconomical.

In addition, since work such as welding is required when joining the shield bodies a and b, there is a problem that workability is poor.

The present invention has been made for the purpose of solving the above-mentioned conventional problems, and provides a joining method and a joining device for a shield excavator capable of joining the shield main body without the need for a radiation freezing tube, and the time and cost are reduced. It is intended to reduce the cost.

(Means and Actions for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides a shield excavator that excavates a tunnel in two directions, and when two shield excavators face each other in the vicinity of a penetration, the shield is excavated. The cutter head provided at the front of the main body is stored in the chamber and further excavated until the tip of the shield body comes close to it, and then the ground around the tip is cooled by the adhesive freeze tube provided at the tip of the shield body. After creating frozen soil in the target range, part of the cutter head is disassembled, the joining segment is assembled between each shield body to stop water at the joint, and then the undisassembled part of the cutter head is disassembled. The radial freezing pipe is used by collecting the cutter head and then placing a secondary lining concrete on the inner peripheral surface of each shield body and connecting each shield body. It was designed to connect the shield bodies without doing so, and since the cutter head of the undisassembled part was dismantled after water was stopped by the joining segment, the disassembled part of the undisassembled part could be melted. I was able to do it.

In addition, the cutter head in the front part of the shield body can be further excavated while being stored in the chamber, so that the tips of the shield body can be brought closer to each other, and the range of frozen soil can be shortened, which is necessary for the construction. (EN) A joining method and joining apparatus for a shield excavator capable of saving time and cost.

Further, according to the present invention, a cutter head that can be stored in a chamber is rotatably provided in a front portion of a shield body by a slide jack, and at least an outer peripheral portion of the cutter head is formed by a plurality of dividing members so that the dividing members can be disassembled. Since the shield machine of the present invention can slide the cutter head and take it into the chamber by configuring the above, when used in the joining method, when the two shield machines face each other in the vicinity of the penetration part, the cutter head is It is housed in the chamber and the tip of the shield body can be in close proximity.

Further, since the cutter head of the present invention has at least its outer peripheral portion formed of a plurality of divided members, a part of the cutter head can be disassembled after the two shield machines come close to each other. After securing a large space of the joining segment, the joining segment can be assembled.

Therefore, since it is not necessary to perform large-scale work such as fusing of the outer peripheral portion of the cutter head and removal of the cutter head, not only the construction period is shortened, but also the segments are assembled early and the construction is stopped, which is safe.

If the cutter head, which is partially disassembled, is used as an erector when assembling the joining segments, the segments can be assembled earlier.

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a state in which a tunnel is excavated from two directions by two shield excavators 1 and each shield excavator 1 faces each other at the tunnel penetration portion. Each shield excavator 1 is in front of the shield body 1a. A cutter head 3 which is rotated by a cutter head drive motor 2 is provided in the section.

Each of the cutter heads 3 has an outer diameter of a chamber so that it can be housed in a chamber 1b provided in the front part of the shield body 1a.
It is formed to have a diameter slightly smaller than the inner diameter of 1b, and is provided with a large number of cutters 4 projecting on the front surface for excavating the ground in front of the shield body 1a.

Further, the cutter head 3 is divided into a large number of circumferential portions in the circumferential direction as shown in FIG. 2 so that the cutter head 3 can be recovered from the inside of the shield body 1a. In addition, a supporting member 3b is provided on the back side of the cutter head 3 so as to project therefrom.
The rear end portion is supported by the partition wall 1c of the shield body 1a via the slide mechanism 6.

In the slide mechanism 6, an annular slide member 6b is slidably housed in a tubular guide member 6a in the front-rear direction. The slide member 6b is moved back and forth by a plurality of slide jacks 7 and a slide member 6b. The rear end of the supporting member 3b of the cutter head 3 is rotatably supported via a bearing 8.

The cutter head 3 is rotated by a plurality of cutter drive motors 2 attached to the slide member 6b.

On the other hand, on the inner peripheral surface of the front part of the shield body 1a, a plurality of sticking freeze tubes 10 are provided in the circumferential direction.

Refrigerant is circulated from the refrigerating device (not shown) to these pasting freezing tubes 10 so that frozen soil can be formed in the ground in front of the shield body 1a.

Next, the joining method of the shield excavator will be described with reference to FIGS. 3 to 7. When the two shield excavators 1 that start excavation from two directions reach the vicinity of the tunnel junction,
First, while further checking the positions of the shield bodies 1a of each other by check boring or the like, proceed further.

When the shield bodies 1a face each other at the tunnel junction, as shown in FIG. 1, the slide member 6b is gradually retracted by the slide jack 7, and the cutter head 3 supported by the slide member 6b is moved to the first position. As shown in FIG. 3, while being housed in the chamber 1b in the shield body 1a, further excavation is continued as shown in FIG. 3, and the tip end portion of the shield body 1a is opposed as shown in FIG.

Then, after the solidifying agent is injected into the earth and sand in the chamber 1b to solidify it, a temperature measuring pipe (not shown) is buried in the ground at the tip of the shield body 1 so that the temperature of the ground can be measured. Refrigerant is circulated from the freezing device (not shown) to the pasting freezing tube 10, and frozen soil 12 as shown by the diagonal lines in Fig. 3 is formed up to the target range around the joint.

Next, after removing the solidified sand in the chamber 1b in this state, the dividing member 3a of the cutter head 3 which is divided into a plurality of pieces in the circumferential direction is removed and collected.

At this time, since the dividing member 3a can be recovered only by removing the fixing tool 5 which fixes the dividing member 3a, it is not necessary to perform the fusing as in the conventional case, and therefore the frozen soil 12 created by the heat due to the fusing is melted. I don't have to worry.

Next, as shown in FIG. 6, the joining segment 13 is attached to the portion where the dividing member 3a is removed over the entire circumference. At this time, the cutter head 3 is rotated so that the cutting head 3 is attached to the joining segment 13a. It can be used as an erector.

If there is a gap between the shield bodies 1a, a flexible segment is used as the joining segment 13 to absorb the gap.

When water is expected, as shown in FIG. 6, a water blocking agent 14 is provided between the inner peripheral surface of the chamber 1b and the joining segment 13.
By injecting, it is possible to stop water reliably.

After the water stop between the shield bodies 1a is prevented as described above, the undisassembled portion of the cutter head 3 is disassembled by fusing or the like.

At this time, even if a part of the frozen soil is melted by the heat generated by the melting, since there is no possibility that the melted frozen soil will flow into the shield body 1a because the water has already been stopped, the refrigeration system during dismantling is continued. Then, the refrigeration system is stopped when the dismantling is completed.

When the cutter head 3 has been disassembled and the cutter head 3 has been recovered, a secondary lining concrete 15 is provided on the inner peripheral surface of the shield body 1a so as to bury the joining segment 13 as shown in FIG. The joining method is completed by driving.

(Effects of the Invention) As described in detail above, when two shield excavators face each other in the tunnel penetration portion, the cutter head is housed in the chamber and further excavation is performed until the tip of the shield body approaches. As a result, the space between the shield bodies can be made extremely small, and by doing this, it is possible to prevent ground collapse and flooding by creating frozen soil only with the attached freezing pipe. This will save a lot of time and money as compared to the case of creating frozen soil.

Also, by disassembling a part of the cutter head after the frozen soil is created and attaching a joining segment between each shield body,
Since the uncut part of the upper cutter head was dismantled in order to stop the water between the shield bodies, even if part of the frozen soil is melted by heat such as melting during dismantling, it will flow into the shield body. Since there is no such thing, dismantling work can be performed safely and quickly.

Further, since the shield machine of the present invention can slide the cutter head into the chamber, it can be stored in the chamber when two shield machines are confronted in the vicinity of the penetration if used in the joining method. However, the tip of the shield body can be brought closer.

Further, since the cutter head of the present invention has at least its outer peripheral portion formed of a plurality of divided members, it is possible to disassemble a part of the cutter head after the two shield machines come close to each other, and therefore, in the skin plate. After securing the space, the joining segment can be assembled.

Therefore, since it is not necessary to perform large-scale work such as fusing of the outer peripheral portion of the cutter head and removal of the cutter head, not only the construction period is shortened, but also the segments are assembled early and the water is stopped, which is safe.

If the cutter head, which is partially disassembled, is used as an erector when assembling the joining segments, the segments can be assembled earlier.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a sectional view of a shield excavator, Fig. 2 is a front view of a cutter head, Figs. 3 to 7 are explanatory views of operation, and Fig. 8 is a conventional explanation. It is a figure. 1 …… Shield excavator, 1a …… Shield main body, 1b …… Chamber, 3 …… Cutter head, 3a …… Separating member, 7 …… Slide jack, 10 …… Paste frozen tube, 13 …… Joining segment.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-75290 (JP, A) JP-A-64-48994 (JP, A) Actual development: JP-A-60-62598 (JP, U)

Claims (4)

[Claims] 1. A cutter provided in the front part of a shield body (1a) when two tunnel excavators (1) face each other in the vicinity of a penetration part by excavating a tunnel from two directions by the shield excavator (1). While retracting the head (3) into the chamber (1b), further excavation is performed until the tip of the shield body (1a) comes close to it, and then the tip of the shield body (1a) is attached to the periphery of the tip by a sticking freeze tube (10). After cooling the ground of No. 2 and creating frozen soil in the target range, part of the cutter head is disassembled and the connecting segment (1
After assembling 3) to stop the joint from water, disassemble the undisassembled part of the cutter head (3) to recover the cutter head (3), and then to the inner peripheral surface of each shield body (1a). A method for joining shield excavators, which comprises placing a secondary lining concrete (15) and connecting the shield bodies (1a). 2. A cutter head (3), which is retractable in a chamber (1b), is rotatably provided at a front portion of a shield body (1a) by a slide jack (7), and at least an outer circumference of the cutter head (3). A shield excavator in which a part is formed by a plurality of divided members (3a) and the divided members (3a) are disassembled. 3. A water blocking material is injected between the inner peripheral surface of the chamber (1b) and the joining segment (13) after joining between the shield main bodies (1a) by the joining segment (13). The method for joining a shield excavator according to item (1). 4. The joining device for a shield excavator according to claim 2, wherein the cutter head (3), which is partially disassembled, is used as an erector during assembly of joining segments.