JPS62276194A - Method of underground junction 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] 3. Detailed Description of the Invention "Field of Industrial Application" This invention is a method of cutting a tunnel from both ends of the tunnel at the same time by using two Hnourt machines. Concerning underground joining method for shield tunnel when joining midway.

``Prior Art'' Conventionally, as an underground joint construction method for this type of shield tunnel, the one shown in FIG. 13 is known.

In the figure, the symbol G is the ground near the junction of the shield tunnel that has been excavated from both ends, and within the ground G, the shield machine L that excavated one tunnel Ta is on the right side of the page, and the shield machine L that excavated one tunnel Ta is on the left side. The shield machine 2, which excavated the other tunnel Tb, is facing the other one, leaving behind a ground Gi at a predetermined distance (approximately 30 cm). 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, skin plates Ia and 2a are attached to the tip of the shield machine 1.2.
Drilled freezing tubes 4a, 4 are drilled into the ground G at a predetermined angle of inclination (α=17° to 25°) and at a predetermined pitch in the circumferential direction.
b is installed, and the skin plates 1a, 2
A and the frontmost segments 1-3a and 3b have a structure in which freezing tubes (not shown) are attached to the entire inner peripheral surface.

The perforated cryotubes 4a, 4b installed on the skin plates 1a, 2a and the pasting are applied to the ground on the outer periphery of the skin plates Xa, 2a so as to surround the ground Gi by avoiding the circulation of brine in the freezing pipes. After freezing G.
Surface portion 5a of 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. The finished service.

"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 was made in view of the above-mentioned problems, and ensures sealing and water stoppage against earth water pressure acting on the tunnel joint from the ground G near the tunnel joint, and prevents damage to the ground. The purpose of the present invention is to provide an underground bonding method for shield tunnels that can be safely constructed and 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 skin plate having a fitting convex portion formed at the tip thereof, and a first skin plate having a fitting convex portion formed at the distal end thereof. A first cutter device having a first cutter device whose tip blade is configured to be retractable so that it can be stored inside the first cutter device.
and a second skin plate in which a fitting concave portion that fits with the fitting convex portion is formed inside the tip portion, and the tip blade is retractable in the same manner as the first cutter device. After excavating a tunnel from both ends using a second shield machine having a second cutter device configured as a first step, when joining the tunnel, the tips of the first and second cutter devices are used. By reducing the size of the blade and fitting the fitting protrusion into the fitting recess, the first skin plate and the second skin plate were connected and the joint was isolated from the surrounding ground. After that, the shielding machine is dismantled with the skin plates of the first and second shielding machines remaining, and the wall surface of the joint part is lined by pouring concrete into the fitting part. It is said that

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

[Figs. 7 to 7 show one embodiment of the present invention, and Figs. 8 to 12 show a second embodiment. In these figures, the same elements (ζ are denoted by the same reference numerals) as those shown in FIG. 13.

In the figure, the symbol G is the ground near the joint of the shield tunnel excavated from both ends, and inside the ground G, the shield machine 1 excavated the first tunnel '1'a on the right side of the page. and the shield machine 2 which excavated the other tunnel 'rb are facing each other on the left side, leaving the ground Gi at the joint part at a predetermined distance (approximately 1 Om). The wall surface of the tunnel Ta formed at the rear of the shield machine 1 is lined with segments 3 a, 3 a, . . . , and the wall surface of the tunnel T b formed at the rear of the shield machine 2 is segment 3 b, 3
-Next lining is being performed by b, .

The shielding machine 1 has a cylindrical first skin plate 1a having a fitting protrusion 10 formed at its tip, a cutter device 11 attached to the tip via a partition plate lb, and a rear part of the shielding machine t. Attached propulsion jacks 12, 12
．． ...is the main component. Further, the shielding machine 2 includes a cylindrical second skin plate 2a in which a fitting recess I3 that fits with the fitting convex part IO is formed inside the tip, and a partition plate 2b interposed in the tip of the second skin plate 2a. A cutter device 14 is attached to the shield machine 2, and a propulsion jack 15, 15. ...is the main component.

The fitting convex portion 10 is formed in a conical shape at the tip of the skin plate, that is, the diameter gradually decreases toward the tip, and the fitting recess 13 is formed in a conical shape on the inside of the tip of the skin plate 2a. In other words, the curved surface of the fitting recess is formed such that a part of the fitting convex part is at least linearly connected to a part of the fitting recess. It is something that

Further, as shown in FIGS. 6 and 7, the cutter device 11.14 has an inner cutter portion 11a that protrudes forward and excavates the inner peripheral side.
, 14a, and an outer blade part jlb that excavates the outer peripheral side behind it.
, 14b, and shaft portions 11e and 14c that support them. At the tips of the outer blade parts 11b and 14b,
A retractable tip blade 1 is located within a support portion 15 that fixes the outer blade.
6 is attached, and during normal excavation, the length is approximately the same as the outer diameter of the skin plates la and 2a, as shown in Fig. 6, and during tunnel joining, as shown in Fig. 7. A drive device 17 using a hydraulic jack drives the cutter device 11. The tip portion of +4 is configured to be able to be reduced inward from the inner diameter of the tip portion of the fitting convex portion IO.

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

(1) To create a single tunnel, first excavate the ground G from the right side of the paper using the first shield machine 1 and the cutter device 11, and then attach the segment 3 a to the wall of the excavated tunnel.
, 3a, . . . perform the primary lining, and the propulsion jacks 12, 12. take reaction force to the segments 3a, 3a, . By driving..., one tunnel Ta is built, and the second tunnel Ta is built from the left side.
The ground G is excavated by the cutter device 14 using the shield machine 2, and segments 3 b,
Perform the primary lining by 3 b, . . . and reverse the segments 3 b, 3 b, . . .

Take power and propel the jack 5. t 5. By driving..., the other tunnel 'rb is constructed. Then, at the joint part, the shield lit and the Nhölt machine 2 are made to face each other with a predetermined length of ground Gi (approximately 1+n) remaining.

(11) Next, as shown in FIG. 2, the shield machine 1 is propelled toward the stopped shield machine 2, and the cutter device 11 is brought into contact with the cutter device 14.

(iii) Next, as shown in FIG. 3, the tip blade 11 of the cutter device 11.14 of the shield machine 1.2 is reduced to the inside of the fitting convex portion 10 by driving the drive device 17. At that time, mud injection pipes (not shown) are provided on the partition plates 1 b and 2 b, and mud is injected into the tip of the shield machine to prevent the face from collapsing.

(iv) Next, as shown in FIG. 4, by further advancing the shield 141 toward the stopped shield machine 2, the shaft portion 11 of the cutter device II
c, 14c into the inside of the partition plates 1b, 2b, and then line-join a part of the fitting protrusion 10 to a predetermined position of the fitting recess 13 (2), the skin plate Ia, 2
The inside of the joint of the shield ill, 2 is shielded from the surrounding ground by a. At that time, the above-mentioned fitting protrusion IO and fitting recess 13 are to be brought into close contact with each other using the thrust pressure of the rolled barb 1, and a chemical solution is injected near the joint to completely drain the clean water. .

Further, the cutter device 11.14 is housed in the space S formed between the fitting protrusion and the fitting recess.

(V) Next, as shown in FIG.
．． 12. ..., l 5,15. After dismantling the skin plates Ia and 2a, the joints X of the skin plates Ia and 2a are welded, and concrete c is poured inside to form a lining.

Therefore, in the shield tunnel joining method of the present invention, the shield machine 1 is propelled toward the shield machine 2, and the fitting protrusion 10 is brought into contact with the fitting recess I3, creating a so-called lap joint state. Accordingly, the ground G at the joining point
i is covered with a skin plate and taken inside the shield machine 1.2, there is no large gap between the shield machines 1.2, and water supply and soil retention at the joint is almost guaranteed,
Tunnel joining work can be performed safely without damaging the ground. As a result, there is no need to use the freezing method, which is used as an auxiliary construction method, and it is possible to significantly reduce construction costs and construction period.

Next, a second embodiment will be explained using FIGS. 8 to 12. In the figures, the same elements as those shown in the first embodiment are given the same reference numerals.

In the figure, the ground G near the junction of the shield tunnel
In the figure, a shield machine L that excavated a first tunnel Ta on the right side of the paper and a shield machine 2 that excavated the other tunnel Tb on the left side are located at a joint at a predetermined interval (approximately 1.0 m). They are facing each other with the Jiyama Gi left behind. And the N'ld machine! The walls of the rear tunnel Ta are segments 3a, 3a.

...Also, the tunnel T behind shield machine 2
The wall surface b has been lined by segments 3b, 3b, . . . .

The shield machine 1 includes a cylindrical first skin plate 1a having a fitting convex portion IO formed at its tip, a cutter device ff attached to the tip via a partition plate 1b, and a first skin plate. An internal shield 1 consisting of a first propulsion jack l 2, 12°... attached to the rear of 1a.
ilA, and the first propulsion jack l2, which is slidably provided on the outer periphery of the first skin plate 1a, and the first propulsion jack l2. ! 2. . . . a second skin plate 20 formed with a ring-shaped protrusion 20a that comes into contact with the second skin plate 2o, and propulsion jacks 21, 21 . The main components are an external shield machine IB consisting of... The space between the tip of the internal shield device IA of the shield device 1 and the external shield [18] is filled with a highly active filler such as grease to prevent dirt from entering and to ensure water quality. do it like this.

In addition, the shielding machine 2 includes a cylindrical skin plate 2a having a fitting recess 13 formed inside the tip; π, which engages with the fitting convex lO, and a partition plate 2b interposed at the tip. cutter device i4 and shield Ia, 2 attached to
Propulsion jack I attached to the rear of 5.15.・
The main components are...

The fitting convex portion 10 is formed in a conical shape at the tip of the skin plate, that is, the diameter gradually decreases toward the tip, and the fitting recess 13 is formed in a conical shape on the inside of the tip of the skin plate 2a. In other words, an inclined surface whose diameter gradually increases toward the tip is formed, and the fitting recess 13 is formed so that a part of the fitting convex part 10 is at least parallel-line connected to a part of the fitting recess I3. A curved surface is formed and is double.

In addition, as shown in FIGS. 6 and 7, the cutter devices II and 14 have the same structure as the first embodiment described above (the cutter device II and 14 have a retractable tip blade at the opening). 20 is
During normal excavation, the length is approximately the same as the outer diameter of the second skin plate 20 and the outer diameter of the skin plate 2a. At the time of tunnel bonding, the cutter device 11
and 2o, the distal end blade 16 is recessed one space inside the fitting convex portion IO.

Next, a tunnel junction method according to a second embodiment of the present invention will be described using FIGS. 8 to 12.

(1) As shown in Fig. 8, a single tunnel is first excavated from the right side of the paper through the ground G using the cutter device 11 using the first shield machine l, and the wall surface of the excavated tunnel is The primary lining was carried out on segments 3a, 3a, ..., and the segments 3a, 3a.

Propulsion jack takes reaction force to...21.21. ...
While driving one tunnel Ta, excavate the ground G from the left side using the cutter device 14 using the second shield machine 2, and cut segments 3b, 3b, The primary lining is performed by ..., and the other tunnel Tb is constructed by taking reaction force from the segments 3 b, 3 b, ... and driving the propulsion jacks 15°15, ... . Then, at the joint, the shield machine 1 and the shield machine 2 are made to face each other with a predetermined length of ground Gi (approximately 1 m) left.

(11) Next, as shown in FIG. 9, the shield Jf9. Promote l. At that time, the injection pipes 22 provided on the partition plates 1 b and 2 b are inserted into the face Gi excavated by the cutter device 11.14.
While injecting mud from ports a and 22b to prevent the face from collapsing, as shown in Figure 1O, the tip of the second skin plate 20 of the shielding machine At the same time, the cutter device It of the shield machine 2 comes into contact with the shield machine 2.

14 tip blades! 6 is reduced to the inside of the fitting convex portion IO by driving the drive device 17.

(iii) Next, as shown in FIG. 11, the propulsion jack I2 of the internal shield machine IO. +2. Segments 23, 23 . Assemble ... and take the reaction force to make the propulsion jack +2゜12.
By driving the internal shielding machine 10, the fitting convex part IO of the skin plate la is brought into close contact with the fitting concave part 13 of the shielding machine 2. At that time, a chemical solution is injected into the vicinity of the joint through the injection pipes 24, 24 to completely stop the water.

(1v) Finally, as shown in Figure 12, the shield machine l
the first skin plate la, the second skin plate 20, and the skin plate 2 of the second shield machine 2
After dismantling the shield machine 12 and penetrating the tunnel while leaving the parts a and a, the tunnel wall is lined by pouring concrete C inside the skin plate to form a tunnel Ta.

Complete the Tb joining work.

Therefore, in the shield tunnel joining method in this second embodiment, in order to make the skin plates 2a and 10 into a lap joint state as in the first embodiment, a large gap is required between the shield machines 1 and 2. There are no gaps, water stops and earth retention at the joints are almost guaranteed, and tunnel joint work can be carried out safely without damaging the ground G. There is no need to use it, and it is possible to significantly reduce construction costs and construction period. Also, a shield machine! A second skin plate 20 is provided on the outside of the skin plate Ia, and a waterproofing agent such as grease is filled between the tips of the second skin plate 20. There is no inclined surface in contact with the ground on the outer peripheral surface of the convex part 10, and it is possible to reduce the resistance generated near the fitting convex part when the shield machine I excavates, and also to smoothly propel the internal shield machine [A]. Can be done.

"Effects of the Invention" As explained above, the present invention provides a first skin plate having a first skin plate formed with a fitting convex portion and a first cutter device having a retractable tip blade. In addition to having a second skin plate in which a fitting recess is formed, a second skin plate having a retractable tip blade is provided.
After excavating a tunnel from both ends with a second shield machine having a cutter device, when joining the tunnel, the tip blades of the first and second cutter devices are reduced and the fitting convex portion is cut. After fitting the shield into the fitting recess and isolating the joint from the surrounding ground, the shield machine was dismantled with the skin plates of the first and second shield machines remaining, and then concrete was poured into the fitting part. By installing this type of construction, the wall surface of the joint is lined, so it ensures that the ground near the tunnel joint is protected from the earth water pressure acting on the tunnel joint, and the water is stopped. Construction can be carried out safely without damage, and the construction cost and construction period required for joining tunnels can be significantly reduced.

[Brief explanation of the drawing]

Figures 1 to 7 show an embodiment of the underground joint method for shield tunnels of the present invention. Figure 1 shows two shield machines digging from the left and right, Fig. 2 is a side sectional view of the tunnel showing a state in which the tunnels are facing each other with the shield machine remaining; Figure 3 is a side cross-sectional view of the tunnel showing the cutting edge of the cutter device being reduced, and Figure 4 is a side cross-sectional view of the tunnel showing the fitting protrusion and fitting recess of the shield machine being brought into contact. Figures 5 and 5 are side sectional views of the tunnel, not showing the completed state after joining the tunnel and lining the wall surface of the joint, and Figures 6 and 7 show a retractable cutter device. The figure is a side sectional view showing a state in which the tip blade is extended during normal excavation, FIG. 7 is a side sectional view showing the tip blade in FIG. 6 in a contracted state, and FIGS. 8 to 12 are FIG. 8 is a side cross-sectional view of a tunnel showing a state in which two shield machines excavating from the left and right are facing each other leaving the ground at the joint, and FIG. 9 is a diagram showing the second embodiment. Figure 10 is a side cross-sectional view of the tunnel showing only the first shield machine digging and making contact with the second shield machine, and Figure 10 shows the point where the tips of the two shield machines are in contact with each other. Fig. 11 is a side sectional view of the tunnel showing the inner shield machine being propelled to avoid contact between the fitting protrusion and the fitting recess of the shield machine, and Fig. 12 is a side sectional view of the tunnel. Fig. 13 is a side cross-sectional view of a tunnel showing a state in which the joints and the wall lining of the joints have been completed, and Fig. 13 is a side cross-sectional view of a tunnel showing an underground joint construction method for a shield tunnel using the conventional freezing method. . G: Earth, G1: Earth left between two shield machines, T a, T b, old tunnel, C: Concrete, ■・・・First shield machine, IA・・・Internal shield machine, tB・
...External shield machine, 1a...First skin plate, 2...Second shield machine, 2a.
...Skin plate, 3a, 3b...Segment, 10...Fitting convex portion, If...First
Cutter device, 13... Fitting recess, I4...
Second cutter device, I6... Tip blade, 2o...
...Second skin plate.

Claims (1)

[Claims] While excavating the ground using a cutter device installed at the front, and assembling primary lining segments at the rear, two shield machines are used to propel the tunnel through the ground from both ends of the tunnel to be constructed. An underground joining method for a shield tunnel, which is used to complete a tunnel by excavating a tunnel and joining them in the middle, the method having a first skin plate having a fitting convex portion formed at its tip; , a first shielding machine having a first cutter device whose tip blade is configured to be retractable so that it can be stored inside the fitting convex part; a second shield machine having a second skin plate in which a fitting recess is formed, and a second cutter device having a retractable tip blade similar to the first cutter device; After tunnels are excavated from both ends as a pair, when joining the tunnels, by reducing the tip blades of the first and second cutter devices and fitting the fitting protrusion into the fitting recess. , after connecting the first skin plate and the second skin plate and insulating the joint from the surrounding ground, the first and second skin plates are connected.
An underground joint for a shield tunnel, characterized in that the shield machine is dismantled with the skin plate of the shield machine remaining, and then the wall surface of the joint part is lined by pouring concrete into the fitting part. Construction method.