JPS62258095A - Method of underground joining construction of shield-tunnel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Field of Industrial Application" This invention is a method for shielding when cutting l'11i from both ends of a tunnel at the same time using two Nord Kai machines and joining them in the middle. - Concerning underground joint construction methods for tunnels.

``The technique shown in Figure 5 is known as this type of underground joint construction method for 7-root, l, and tunnel, which has been developed since the 1990s.

In the figure, reference numeral G indicates the ground near the joint of the shield tunnel excavated from both ends, and inside the ground G, one tunnel ′ On the left side, the shield machine 2 that excavated the other tunnel 'rb is located at a predetermined interval (approximately 30 cm) from the ground G.
They face each other with the i left. The walls of tunnels 'I'a and Tb formed behind the shield machines 1 and 2 are segments 3a, 3a, -13b,
3b, due to =・) ゛Question is delayed. In addition, the tip of the shield machine 1.2 has a skin plate la,
A perforated cryotube 4 is installed in the ground G at a predetermined slope color (α=17° to 25°) with respect to 2a and at a predetermined pitch in the circumferential direction.
a, 4b are placed, and skin plate 1 is placed.
A, 2a, and the frontmost safety members 1-3a, 3b are configured such that freezing tubes (shown in the figure) are attached to the entire inner peripheral surface.

Then, the perforated freezing tubes 4a, 4b installed on the m8 skin plates Ia, 2al and the outer periphery of the skin plates la, 2a surrounding the ground Gi are made by circulating brine in the freezing tube. After freezing the ground Gr of 11;, Shield I? ! ! , 2, the front parts 5a and 5b of the shield machine 1 and 2 were dismantled, and the ground Gi left between the front 1-hand shield machine 1 and 2 was excavated, and the wall surface was lined to create a tunnel Ta that was excavated from the left and right. 'Fb and complete the shield tunnel.

``Problems to be Solved by the Invention'' However, in the conventional shield tunnel joining method and its device, both the 7-fold joints do not come into contact with each other, and a gap of about 30 cm is usually created, making it impossible to stop water. and earth retaining systems are far from perfect and there are safety issues.
The freezing construction method, which is mainly used as a HI construction method, requires a lot of construction cost and construction time, and when construction is carried out under the seabed, the strength of the frozen soil mixed with salt decreases, and the frozen soil expands when frozen and when thawed. There were problems such as the impact of ground subsidence and the difficulty of managing frozen soil.

The present invention has been made in view of the above-mentioned problems, so that it is possible to ensure safe sealing and water stoppage against the water pressure acting from the ground G near the tunnel joint to the joint. The purpose of the present invention is to provide an underground joining method for shield tunnels that can significantly reduce the construction cost and construction period required for tunnel joining.

[Means for rounding without solving the problem] The present invention is characterized in that the tip of the skin plate is formed double by an outer cylinder and an inner cylinder, and a penetrating ring is housed between the outer cylinder and the inner cylinder. A tunnel is constructed by using a first 7-fold shield machine as a pair and a second shield machine whose skin plate has a tip end portion of which is double formed by an outer cylinder and an inner cylinder having the same diameter as the first shield machine. In the step of excavating, and at the end of the tunnel excavation process, the penetrating ring of the first shield machine is slid forward along the axis of the first shield machine, and the penetrating ring is used to move the first and second tunnels. A process of covering the ground at the tunnel joint part left between the shield machines, and after this process, dismantling the shield machines with the skin plates of the first and second shield machines remaining, and joining the first and second shield machines. The above-mentioned problem is solved by configuring an underground joint method for shield tunnels, which comprises the steps of excavating the ground in the area, and further lining the wall surface of the joint part by pouring concrete on the inner surface of the skin plate. has been resolved.

Here, it is preferable to provide a water stop means between the outer cylinder and the inner cylinder of the skin plates of the first and second shielding machines. Further, it is preferable that the cutter devices of the first and second shielding machines are provided with cutter portions that are expandable and retractable in the radial direction.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 1 are diagrams illustrating an underground metal fitting method for a shield tunnel, which is an embodiment of the present invention. In these figures, the same elements as those shown in FIG. 5 are given the same reference numerals.

In the figure, reference numeral G indicates the ground near the junction of the shield tunnel that has been excavated from both ends, and within this ground G, the first shield IT is cut by the cutter device IO installed at the front part of the ground. The first tunnel T is on the right side of the paper.
a, and the second shield machine 2 excavates the other tunnel Tb on the left side using the cutter device 20 provided at the front part of the second shield machine 2.
: It has been cut down by m. The wall surface of the tunnel Ta formed behind the shield machine 1 is primarily lined with segments 3a, 3a, . The wall surface of the tunnel 1'b formed in the tunnel 1'b is primarily lined with segments 3b, 3b, . . . assembled inside the shield machine 2.

The first shield machine 1 is provided with a skin plate 1a that is formed into an inner cylindrical shape and forms the outer shell of the main body of the shield machine 1. The tip 1b of this skin plate la is
The outer cylinder 11 is formed to have the same diameter as the skin plate 1a, and the inner cylinder 12 is formed to have a smaller diameter than the outer cylinder 11, forming a double structure. Between the outer cylinder 11 and the inner cylinder 12, an inner cylindrical penetrating ring 13 is housed, either integrally or divided into pieces.The rear end of this penetrating ring I3 has a bulging portion 13a. is formed. In addition, a water-releasing agent such as rubberized asphalt or grease is filled between the outer cylinder 11 and the inner cylinder 12, so that the outer cylinder I
A water stop means is provided between I and the inner cylinder 12. A partition plate 14 formed perpendicularly to the axis of the shield machine 1 is provided inside the inner cylinder I2. The inner cylinder 12 and the skin plate 1a are connected by a ring-shaped support plate 15 formed perpendicular to the axis of the shield machine 1. Several extruded jacks 17, 17, ... are attached to the curved surface of the bearing plate I5 in the circumferential direction, and the working end 17a of the extruded jack 17 comes into contact with the rear surface of the penetrating ring bulge 13a. ing. Further, the bearing pressure flj [propulsion jacks] 8.18, . . . are attached to the rear surface of 5 in the circumferential direction;
is in contact with the side of the

The cutter device 10 provided at the front part of the first shield machine 1 is formed to have a slightly smaller diameter than the inner cylinder 12, and its shaft body 19 is pivotally supported by the partition plate 14, so that the cutter device 10 is provided at the front part of the first shield machine 1. is supported by A cutter portion 10a that is extendable and retractable in the radial direction of the shielding machine 1 is provided at the edge of the cutter device IO.
is provided.

The second skin play machine 2 has the first skin play 1-
A skin plate 2a formed into an inner cylinder shape having the same diameter as 1a is provided, and a tip 2b of this skin plate 2a has a diameter of 1a.
I: Like the first shield machine 1 in j. ing. 11) 1 between the outer cylinder 21 and the inner cylinder 22 is filled with a highly viscous water-stopping agent such as rubberized asphalt or fleece. It is configured. Inside this inner cylinder 22,
A partition plate 24 formed perpendicular to the axis of the shield machine 2 is provided. Inner cylinder 22 and skin play)
2a is connected to the shield machine 2 by a ring-shaped bearing plate 25 formed perpendicular to the axis of the shield machine 2.

The skin plate 2a also has a ring 23 inside.
A plurality of propulsion jacks 28.2g, . . . are attached to the rear surface of the ring 23 in the circumferential direction.

The working end 28a of the propulsion jack 28 is in contact with the side surface of the segment 3b at the tip.

The cutter device 20 provided at the front part of the second shield machine 2 is formed to have a slightly smaller diameter than the inner cylinder 22, and its shaft body 29 is pivotally supported by the partition plate 24, so that the cutter device 20 is installed at the front part of the second shield machine 2. It is supported by 2.

A cutter portion 20a that is extendable and retractable in the radial direction of the shield machine 2 is provided at the edge of the cutter device 20, similarly to the first cutter device 10.

In addition, mud injection pipes 1G and 26 are provided in the first and second shields at and 2, respectively, and these pipes I
The open end of 6.26 is located at the tip of each shield machine 1, 2.

Next, the underground joining method of the present invention will be explained using FIGS. 1 to 11.

(First, from the right side in Fig. 1, use the first shield machine l to go up to the cutter device !0 and excavate the ground G, and then cover the walls of the excavated pit with segments 3a, 3a, ... This segment 3a.

3a, ... takes the reaction force and propulsion jack 18.18,
By driving ..., one tunnel Ta is constructed. At this time, the cutter device! The retractable cutter section 10a of the cutter device 10 is extended so that the cutter device 10 can excavate a tunnel having at least the same diameter as the outer cylinder 11. At the same time, from the left side in Figure 1, the second
The ground G is excavated by the cutter device 20 using the shield machine 2 of
,... will be lined, and this segment 3b, 3b,...
The other tunnel ``I''b is built by taking the reaction force from the propelling jacks 28, 28, . is extended so that this cutter device 20 can excavate a tunnel having at least the same diameter as the skin plate 2a.(FIG. 1) Then, at the junction of the tunnel, the first shield 17N+ and the second shield U faces the machine 2 leaving a predetermined length of ground Gi (approximately 30 cm - 1 x fff degree).

reactor. At this time, the extended cutter parts 10a, 20a are shortened to their original length. Here, cutter device 1O
120 is formed to have a slightly smaller diameter than the inner cylinder I2.22, so the cutter portion 10a.

In order to shorten 20a, the inner cylinder 12.22 and cutter device l
Earth and sand enters into the shield machines 1 and 2 through the gap with 0120. Therefore, mud is injected into the ground Gi at the tunnel junction using the pipes 1G and 26 to prevent the intrusion of earth and sand and to prevent the ground Gi from sinking. (Second
(Fig.) (ii) Next, the extrusion jack 17 of the first shielding machine I
is driven, and the tip of the penetrating ring I3 or the outside f? of the second shield machine 2 is driven. Slide this penetrating ring 13 forward along the axis of the shield machine I until it is inserted into the gap between i21 and the inner cylinder 22. As a result, the 11-man ring 13 covered the ground Gi at the tunnel junction left between the first shield machine 1 and the second 7-shield machine 2. Here, the rubberized asphalt and grease filled between the outer cylinder If, 21 and the inner cylinder 12.22 are
As the ring 13 is pushed out, it leaches into the ground Gi at the joint from the gap between the skin plates 1a and 2a. Therefore, the leaching of the rubberized asphalt and the grease can further ensure the watertightness of the joint against the ground Gi.

In addition, when performing secondary lining on tunnel Ta, 'I''b,
Before lining the tunnel joint, concrete is poured on the inner surfaces of the segments 3a and 3b up to the vicinity of the joint. (Figure 3) (Mountain) Then, cutter device 10.20 was dismantled and removed.)
At the same time, the partition plate 161.2.1 is cut out and removed, and both ends of the penetrating ring I3 are welded to the inner cylinder 12.22. Next, the wall surface of the joint is lined by pouring concrete 31 including the thickness for the secondary lining on the inner wall surface of the skin plate. Here, for the purpose of reinforcing the tunnel joint, on the inner surface of the inner cylinder I2.22,
For example, the support 32 may be made of type II steel. (
Construction of the shield tunnel joint will be completed using the construction method shown in Figure 4 and above. Here, the ground G at the tunnel junction
i is the tip of the skin plate of the first shield machine 1! b
Since it is covered by a penetrating ring 13 provided at the joint, the penetrating ring 13 performs earth retention and water stoppage at the joint. Therefore, the shield tunnel joint can be constructed without using an auxiliary method such as the conventional freezing method, and it does not require a lot of construction cost and construction period as in the conventional freezing method. Construction of joints can be carried out. Therefore, earth retaining and water supply can be ensured against the earth water pressure acting from the ground G near the tunnel joint to the joint, and construction can be carried out safely, and the construction cost and construction period required for tunnel joint can be reduced. It becomes possible to provide an underground joining method for shields, lumbers, and tunnels that can significantly reduce the amount of water used.

In particular, in this embodiment, water stop means made of rubberized asphalt or grease is provided between the outer cylinders II and 21 of the first and second shield machines I and 2 and the inner cylinder I2.22. By using the penetrating ring 13, it is possible to more reliably supply clean water when covering the ground Gi at the tunnel joint. Similarly, the cutter devices 10120 of each of the shield machines 1 and 2 are provided with cutters 1Ioa and 20 that are expandable and retractable in the circumferential direction.
a is provided, so that the phenomenon of reduction in the excavation diameter due to the double formation of the tip portions tb and 2b of the skin plates Ia and 2a does not occur. It becomes possible to reduce the resistance.

In addition, in this embodiment, the cutter device 10120 is formed to have a slightly smaller diameter than the inner cylinder 12.22, so if the cutter device 10.20 is released from its pivot support and fixation by the partition plate 14.24, this cutter device 10.20 can be removed. The device 1O120 is connected to the inner cylinder 12
．． It becomes possible to store the old pattern inside the frame formed by the tip end of 22 and the partition plate 14.24. Therefore, the step (1)
In 1), after the cutter parts 10a and 20a are shortened, the propulsion jacks 18 and 28 are further driven and each shield machine 1
．． Even if the cutter devices 1O120 are moved closer together, the cutter devices 1O120 do not come into contact with each other. Therefore, by bringing the shield devices 1.2 closer to each other and facing each other, it is possible to further ensure water stoppage at the tunnel junction.

It should be noted that the method for underground joining of a shield tunnel according to the present invention is not limited to the above-mentioned embodiments. For example, the mechanism for sliding the penetrating ring 13 forward is not limited to the extrusion jack 17 as in the embodiment 1iir, but may also be used to slide the penetrating ring 13 against the earth water pressure at the joint. Any mechanism that can do this is fine.

``Effects of the Invention'' As explained above, in this invention, the tip of the skin plate is double formed by an outer cylinder and an inner cylinder, and a penetrating ring is inserted between the outer cylinder and the inner cylinder. The first
excavating a tunnel by using a second shield machine as a set including a shield machine and a second shield machine in which the tip of the skin plate is double formed by an outer cylinder and an inner cylinder having the same diameter as the first shield machine; Immediately before the end of the tunnel excavation process, a step of covering the ground at the tunnel joint left between the first and second shield machines with the penetrating ring; The shielding machine is dismantled with the skin plate of the shielding machine remaining, the ground at the joint is excavated, and concrete is poured on the inner surface of the skin plate to complete the lining process. Since the underground joint construction method of the shield tunnel is constructed, the earth retention and water supply at the joint part are carried out by the penetration ring provided on the first shield machine. Therefore, the shield tunnel joint can be constructed without using auxiliary construction methods such as the conventional freezing construction method, and it does not require much construction cost and construction time as in the conventional freezing construction method. Construction of joints can be carried out. Therefore, the construction of shield tunnels can be carried out safely by ensuring earth retaining and water stoppage at tunnel joints, and can significantly reduce the construction cost and construction period required for tunnel joints. It becomes possible to use the medium joint method fJ':.

In addition, if a +h water means is provided between the outer cylinder and the inner cylinder of the first and second shield tills, water can be more reliably stopped when covering the ground at the tunnel joint with the 1T man ring. It can be done. Similarly, when the cutter device of each of the shield machines is provided with a cutter portion that is freely expandable and retractable in the circumferential direction,
It becomes possible to reduce the propulsion resistance applied to the shield machine during tunnel excavation.

[Brief explanation of drawings]

Figure 1 is a diagram for explaining the underground connection method for a shield tunnel which is an embodiment of the present invention, Figure 2 is a diagram similar to Figure 1, and Figure 3 is the same as Figure 1 (with envy). Figure 1 is similar to Figure 1, and Figure 5 is a diagram showing a state in which the tunnel is joined by the freezing method, which is a conventional underground joining method for shield tunnels.G. ...Ground, Gi...Tunnel junction ground, 'ra...Tunnel, 'l' b...
...Tunnel, I...First shield machine, 2
...Second shield machine, Ia, 2a...
・Skin plate, Ib.

Claims (3)

[Claims] (1) Two shield machines are used to excavate the ground using a cutter device installed at the front, while assembling segments for the primary lining inside to propel the tunnel. This is an underground joining method for shield tunnels, in which the tunnel is completed by excavating tunnels from the ground and joining them midway, and the tip of the skin plate is double formed by an outer cylinder and an inner cylinder. and a penetrating ring is stored between the outer cylinder and the inner cylinder, and the tip of the skin plate is separated by an outer cylinder and an inner cylinder having the same diameter as the first shield machine. A step of excavating a tunnel using a set of second shield machines formed in a heavy manner, and immediately before the end of the tunnel excavation process, a penetrating ring of the first shield machine is moved along the axis of the first shield machine. a step of sliding the shield machine forward to cover the ground at the tunnel joint portion left between the first and second shield machines with the penetrating ring; and after completing this step, the first and second shield machine The step of dismantling the shield machine with the skin plate remaining, excavating the ground at the joint, and further lining the wall surface of the joint by pouring concrete on the inner surface of the skin plate. Underground connection method for shield tunnels. (2) The shield tunnel according to claim 1, characterized in that a water stop means is provided between the outer cylinder and the inner cylinder of the skin plates of the first and second shield machines. Underground joint method. (3) The underground joining method for a shield tunnel according to claim 1, characterized in that the cutter devices of the first and second shield machines are provided with cutter parts that are expandable and retractable in the radial direction. .