JPS62258094A - 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] "Industrial Application Field" This invention involves simultaneously excavating one tunnel from both ends of the tunnel using two shield machines, and excavating the shield tunnel at the point of joint slippage in the middle. Regarding underground bonding method.

``Prior Art'' Conventionally, the method shown in Figure 8 is known as an underground joint construction method for this type of shield tunnel.

In the figure, the symbol G is the ground near the joint of the shield tunnel that has been excavated from both ends, and within the ground G, the shield machine 1 that excavated one tunnel Ta is on the right side of the page, and the shield machine 1 that has excavated one tunnel Ta is on the left side. The shield machine 2 which excavated the other tunnel Tb faces the shield machine 2 with a predetermined spacing (approximately 30 cm) left behind. And shield machine 1
．． The walls of tunnels Ta and Tb formed behind 2 are as follows:
Segment 3 a, 3 a,..., 3 b, 3
The lining is being carried out by b,... In addition, the tip of the shield machine 1.2 is provided with a perforation type in the ground G at a predetermined inclination angle (α = 17° to 25°) with respect to the skin plates la and 2a, and at a predetermined pitch in the circumferential direction. Freezing tubes 4a, 4b
are installed, as well as skin plates la and 2a.
A freezing tube (not shown) is attached to the entire inner peripheral surface of the frontmost segments 3a and 3b.

The perforated cryotubes 4a, 4b installed on the skin plates la, 2a and the pasting are made by circulating brine in the cryotubes so that the outer periphery of the skin plates la, 2a surrounds the ground Gi. After freezing the ground Gr, the front part 5a of the shield machine 1.2.

5b was dismantled, and the ground Gi left between the shield machines 1 and 2 was excavated, and the walls thereof were lined to join the tunnels Ta and Tb excavated from the left and right, creating a shield tunnel. complete.

"Problems to be Solved by the Invention" However, in the conventional shield tunnel joining method, both shield machines do not come into contact with each other, and a gap of about 30 cm is usually created between the shield machines, making it difficult to stop water. and that the earthen retaining structures are far from perfect and there are safety issues.
In addition, the freezing construction method, which is mainly adopted as an auxiliary 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 the ground deteriorates when thawed. There were problems such as the effects of subsidence and the difficulty of managing frozen soil.

The present invention has been made in view of the above-mentioned problems, and ensures reliable sealing and water stoppage against earth water pressure acting on the tunnel joint from the ground G near the tunnel joint, without damaging the ground. The purpose of this project is to provide an underground bonding method for shield tunnels that can be constructed safely and that can significantly reduce the construction cost and construction period required for tunnel bonding.

"Means for Solving the Problems" In order to solve the above-mentioned problems, the present invention provides a first outer cylinder and a first outer cylinder provided at its tip. a first shield machine having a double skin plate formed by an inner cylinder; a front outer cylinder formed to have the same outer diameter as the first outer cylinder; and a first shield provided at the tip thereof. a rear inner cylinder which is double formed by the inner cylinder of No. 2, has the same outer diameter as the front outer cylinder, and is slidably provided on the rear inner cylinder provided at the rear of the front outer cylinder; After excavating a tunnel from both ends using a second shielding machine having a double skin plate formed by an outer cylinder and a second shielding machine having a double skin plate formed by an outer cylinder, the first shielding machine of the first shielding machine After moving the inner cylinder forward along the axis of the shield machine while excavating the ground at the joint, the front outer cylinder of the second shield machine is moved forward and the outer cylinder of the first inner cylinder is moved forward. by overlapping the first inner cylinder and the front outer cylinder to cover the ground at the tunnel joint left between the first and second shield machines, and then leave the skin plate of the shield machine behind. The present invention is characterized in that the shield machine is dismantled as it is, and the wall surface of the joint is lined by pouring concrete inside the skin plate.

In this case, the first outer cylinder and the first inner cylinder of the first shielding machine are slidable via a sealing member, and the second
The front outer cylinder and the second inner cylinder, and the rear outer cylinder and the rear inner cylinder of the 7-first shield are slidable via a seal i'i4 ft, and the first shield (later the first shield) The outer cylinder and the first inner cylinder are usually fixed to each other by a fixing means during old cutting, and between the front outer cylinder and the second inner cylinder of the second shield machine, and between the rear outer cylinder and the rear inner cylinder. The cylinders are fixed to each other by fixing means during normal excavation, and the cutting edges of the cutter devices of the first and second shielding machines are connected to the 171st and second shielding machines when joining the tunnel. It is desirable to be able to freely contract inside the inner cylinder.

"Example" Hereinafter, the present invention will be explained with reference to the drawings.

FIGS. 1 to 7 show an embodiment of the present invention, and FIGS. 1 to 4 show the tunnel excavation and joining, and FIGS. 5 and 6 show the sealing mechanism. FIG. 7 is a diagram for explaining the means for fixing the skin plate. In these figures, the same elements as those shown in FIG. 8 are given the same reference numerals.

In the figure, the symbol G is the ground near the junction of the shield tunnel excavated from both ends, and within the ground G, the shield machine 1 that excavated the first tunnel Ta on the right side of the paper, and the left side The shield machine 2 which excavated the other tunnel Ti+ is facing the shield machine 2 with a predetermined interval (approximately 1.0 m) left at the joint portion Gi. The wall surface of the tunnel Ta formed behind the shield machine l is
The wall surface of the tunnel 'Fb formed behind the shield machine 2 is lined with segments 3a, 3a, . . . and is lined with segments 3b, 3b.
The next lining is being carried out by , .

The shield machine 1 includes a first outer cylinder (skin play) Ia formed in a cylindrical shape, and a first excavation equipment main body II that is slidable in the axial direction with a predetermined gap 10 formed inside the outer cylinder Ia. It consists of The first excavation equipment main body II includes a first inner cylinder (skin play 1)+2 formed in a cylindrical shape, and a disk-shaped partition plate 13 fixed inside the first inner cylinder at right angles to the first inner cylinder 12. A cutter device 14 is provided at the front of the frame, and a shaft 15 of the cutter device 14 is supported by the partition plate 13 via a bearing portion 16 that supports the sealing mechanism. , the partition plate 13 has a plurality of propulsion jacks in its circumferential direction.7.17. ...or fixed.

Furthermore, as shown in FIG. 5, a sole member 10a is attached to the gap lO between the first outer cylinder 1a and the first inner cylinder 12 with its upper part fixed to the first outer cylinder 1a. and
The outer cylinder 1a and the inner cylinder 12 are fixed by a fixing means (the same means as the second shield machine, as shown in FIG. 7, which will be described later) during normal excavation except when they are joined. and,
A passage portion 1b such as a lubricant or a solid material is formed inside the first outer cylinder [a] to communicate with the upper part of the seal member 10a.

The shield machine 2 is divided into a front outer cylinder (skin play 1) 2a formed in a cylindrical shape with the same diameter as the first outer cylinder 1a, and a rear outer cylinder (skin plate) 2b. At the rear of the front outer cylinder 2a, there is a cylindrical rear outer cylinder 19 which is slidable at a predetermined distance 13 inside the rear outer cylinder 2b.
is fixed via a ring plate 20. A second excavation device main body 21, which is slidable in the axial direction inside the front outer cylinder 2a, is provided at a predetermined interval 22 at the front of the front outer cylinder 2a.

The excavation device main body 21 has a frame formed by a second inner cylinder (skin plate) 23 formed in a cylindrical shape and a disk-shaped partition plate 24 fixed at right angles to the end face of the second inner cylinder 23. A cutter device 25 is provided at the front of the frame, and the shaft body 26 of the cutter device 25 has a sealing machine groove and a sleeve receiving portion 2.
The ring plate 20 is supported by partitions #Ji and 28 via
9,29°... is fixed.

Furthermore, as shown in FIG. 6, seal members 22a and 22b are provided in the gap 22 between the front outer cylinder 2a and the second inner cylinder 23 of the excavation equipment main body 21, each fixed in a predetermined direction. Assuming that a seal member (same as the seal portion 1o shown in FIG. 5) is attached to the gap 1.3 between the rear outer cylinder 2b and the rear inner cylinder 19, Front outer cylinder 2a! : As shown in FIG. 7, between the excavation equipment main body 21, the rear outer cylinder 2b, and the rear inner cylinder 1q19, fixing means 30 and 31 are used to connect the excavation equipment body 21, the rear outer cylinder 2b, and the rear inner cylinder 1q19. j'tj j'l' is fixed at 1 o'clock. Inside the second outer cylinder 2a, a passage section 2C of lubricant, solidifying material, etc., which communicates with the upper part of the surface seal member 22a, is formed.

Next, the underground joining method of the present invention will be explained using FIGS. 1 to 7.

(i) One tunnel is first cut from the right side with respect to the paper using the first shielding machine 1! 14 excavates the ground G, performs primary masonry on the wall of the excavated pit by segments 3 a, 3 a, ..., and propels it by taking reaction force from the segments 3 a, 3 a, ... Jack 17.17. While driving one of the tunnels Ta, excavating the ground G from the left side using the cutter device 25 using the second shield machine 2, and cutting the ground G on the wall of the excavated tunnel. segment 3
The primary lining is performed by segments 3 b, 3 b, . . . , and the propulsion jacks 29, 29 . The other tunnel Tb is constructed by driving... Then, at the joint, the shield 1fil and the shield machine 2 are made to face each other with a predetermined length of ground Gi (approximately 1 m) left.

Note that during normal excavation of the tunnels Ta and Tb, the first
A lubricant such as grease is injected from the passage portions 1 b and 2 c formed in the skin plate of the second sealing machine 1.2.

(ii) Next, after releasing the fixing means between the outer cylinder 1a of the shield machine 1 and the excavation equipment main body II by cutting, as shown in FIG. 17,17. Along with driving...
While excavating the ground Gi with the excavation blade 111, the excavation device main body l! is pushed forward and brought close to the excavation blade 25.

At that time, since the first outer cylinder (skin plate) la and the first inner cylinder (skin plate 2) move while sliding through the sealing member 10a, water and dirt cannot enter through the gap 10. Coming is to.

(iii) Next, by cutting the fixing means 30 between the front outer cylinder 2a and the second inner cylinder 23 and the fixing means 31 between the rear outer cylinder 2b and the rear inner cylinder 19, as shown in FIG. After releasing, as shown in FIG. 3, the propulsion jack 29 fixed to the ring plate 20 of the front outer cylinder 2a of the shield machine 2
, 29. ... is driven to push the front outer cylinder 2a forward, so that the front outer cylinder (skin plate) 2a touches the outer periphery near the joint between the excavator main body II and the excavator main body 21 that have already been pushed out. By covering, the ground Gi at the tunnel joint is covered. The first outer cylinder (skin plate) 12 is inserted into the gap 10 formed between the first cylinder (skin plate) 12 and the first outer cylinder (skin plate) la and the front outer cylinder (skin plate) 2a of the excavation equipment main body 11. Water is stopped by injecting a chemical solution or a solidifying material such as mortar through a passage part 1b formed in the inner part 11S of the cylinder 1a and a passage part 2c formed in the inside of the front outer cylinder 2a.

In addition, as shown in FIG. 6, when the front outer cylinder 2a and the second inner cylinder 23 are slidably moved via the seal parts 122a and 22b, the rear inner cylinder 19 and the rear outer cylinder 2b are slidably moved via the seal member, and water and earth and sand will not enter through the gaps 22 and I8.

(1v) Next, the first [as shown in the figure, the first and second
The first outer cylinder 1a, the first inner cylinder 12, which is the skin plate of the shield machines 1 and 2. Front outer cylinder 2a, rear outer cylinder 2b,
Second inner cylinder 23. Leaving the rear inner cylinder I9 and removing the cutter devices 14, 25, propulsion jacks 17, 29, etc. of the excavation equipment main bodies 11 and 21, the partition plate I
3 and 28 and the protruding parts of the ring plate 20 are cut and removed, and then the left and right tunnels Ta and Tb are joined.

Next, both ends of the first inner cylinder 12 are fixed to the first outer cylinder Ia and the front outer cylinder 2a by welding, respectively, and then the ends of the rear inner cylinder ■9 and the rear outer cylinder 2b are welded. By fixing the skin plate, the skin plate is integrated and watertight is completed, and the skin plate becomes a strong structure.

Furthermore, by pouring concrete C inside the integrated F Niskin plate, the wall surface of the joint is lined, and the joining work of the left and right tunnels is completed.

In addition, the cutting edge of the outer periphery of the cutter device 1.25 is as follows:
Normally, the length is the same as the outer diameter of the outer cylinder during the normal Jll standby period other than during tunnel joining, and during tunnel joining, the first
and a second drilling rig main body II.

It is desirable to have a structure in which the inner diameter of the 2I inner cylinder is reduced to the inner side.

Therefore, in the shield tunnel joining method, the double skin plates of the first and second shield machines overlap each other and connect by slidingly moving through the seal part (4). As a result, the ground Gi at the joint point is covered with the skin play 1- and taken into the shield machine, creating a large gap between the shield machine 1 and 2 where earth and sand and water can enter. As a result, the water supply and earth retention at the joint are almost guaranteed, making it possible to safely perform tunnel joint work without damaging the ground.As a result, the freezing method, which has been adopted as an auxiliary construction method, There is no need to use other tools, and it is possible to significantly reduce construction costs and construction period.

"Effects of the Invention" As explained above, the present invention provides a first
A tunnel is excavated from both ends using a set of a shield machine and a second shield machine having a double skin plate formed by a front outer cylinder, a second inner cylinder, a rear inner cylinder and a rear outer cylinder. After that, when joining the tunnel, the first inner cylinder is moved forward while excavating the ground at the joint, and then the front outer cylinder is moved forward and the first inner cylinder is moved forward. By stacking the first inner cylinder and the front outer cylinder' on the outside, the first inner cylinder and the front outer cylinder' cover the ground at the tunnel joint left between the first and second shield machines, and then the first and the front outer cylinder' 2, the shield machine is dismantled with the skin plate of the shield machine remaining, and the wall surface of the joint is lined by pouring concrete inside the skin plate. It is possible to securely seal and stop water from the soil water pressure that acts on the joint from the ground near the tunnel joint, without using any auxiliary construction methods such as, etc., and construction can be carried out safely without damaging the ground. At the same time, the construction cost and construction period required for tunnel joining can be significantly reduced.

[Brief explanation of drawings]

Figures 1 to 7 show an embodiment of the underground joint construction method for shield tunnels of the present invention, and Figure 1 shows two shield machines excavating from both sides, digging into the ground at the joint. Fig. 2 is a side sectional view of the tunnel showing the state in which the shields are facing each other with the shield machine left behind; Third
The figure is a side cross-sectional view of the tunnel showing the outer cylinder of the second shield machine being extruded to cover the joint and supplying water to the joint by injecting chemical fluid. Figure 11 is a disassembly of the shield machine except for the skin plate. Figure 5 is a side cross-sectional view of the tunnel showing the state in which the tunnel, which bends forward from both sides, is joined and the wall of the joint is lined. Fig. 6 is a side sectional view showing a sealing mechanism for sealing the gap between the front outer cylinder and the second inner cylinder of the second shield machine. 7 is a side sectional view showing the sealing mechanism of the second knoll machine, and FIG. 7 is a side sectional view showing fixing means between the front outer cylinder and the second inner cylinder and between the rear outer cylinder and the rear inner cylinder of the second knoll machine , FIG. 8 is a side cross-sectional view of a tunnel showing an underground bonding method for a shield tunnel using a conventional freezing method. G...Ground, Gi...Ground at the joint left between the two shield machines, C...Concrete, 1...No. 1 shield machine, la...
...First outer cylinder (skin plate), 2...Second shield machine, 2a...Front inner cylinder (skin plate), 2b...Rear outer cylinder (skin plate), 3a, 3b...segment, lOa...
... Seal member, 12 ... First inner cylinder (skin plate), 14.25 ... Cutter device, I9
... Rear inner cylinder (skin plate), 22 a,
22 b... Seal member, 23... Second inner cylinder (skin plate), 30.31... Fixing means.

Claims (6)

[Claims] (1) By excavating the ground using a cutter device installed at the front, and by using two shield machines that propel the tunnel while assembling primary lining segments at the rear, both ends of the tunnel to be constructed are This is an underground joining method for a shield tunnel in which a tunnel is completed by excavating tunnels from each side and joining them in the middle. a first shield machine having a double skin plate formed by an inner cylinder; a front outer cylinder formed to have the same diameter as the first outer cylinder; and a second inner cylinder provided at the tip thereof. and a rear inner cylinder which is formed to have the same diameter as the front outer cylinder and is provided at the rear of the front outer cylinder, and a rear outer cylinder which is slidably provided. a second shield machine with a formed skin plate;
After excavating the tunnel from both ends as a group, when joining the tunnel, move the first inner cylinder of the first shield machine forward along the axis of the shield machine while excavating the ground at the joint part. After that, the front outer cylinder of the second shield machine is moved forward and stacked on the outside of the first inner cylinder, so that the first inner cylinder and the front outer cylinder are connected to the first and first outer cylinders. 2
Cover the ground at the tunnel joint left between the shield machines, then dismantle the shield machine with the skin plate of the shield machine remaining, and place concrete inside the skin plate. An underground joint construction method for shield tunnels that is characterized by lining the walls of the joint. (2) The shield tunnel according to claim 1, wherein the first outer cylinder and the first inner cylinder of the first shield machine are slidable via a sealing member. underground bonding method. (3) a front outer cylinder and a second inner cylinder of the second shield machine;
and the rear outer cylinder and the rear inner cylinder are respectively slidable via seal members.
2. Underground connection method for shield tunnels as described in paragraph 2 or paragraph 2. (4) The first outer cylinder and the first inner cylinder of the first shield machine are fixed to each other by a fixing means during normal excavation.
Underground joint construction method for shield tunnels as described in section. (5) The front outer cylinder and the second inner cylinder of the second shield machine and the rear outer cylinder and rear inner cylinder are fixed to each other by fixing means during normal excavation. The shield according to claims 1 to 4,
Underground joint method for tunnels. (6) When joining the tunnels, the cutting edges of the cutter devices of the first and second shielding machines are connected to the first and second shielding machines.
6. An underground joining method for a shield tunnel according to claims 1 to 5, wherein the shield tunnel is contractible inside the inner cylinder of the shield tunnel.