JPH011894A - In-situ lining method for shield tunnels - 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 relates to a shield tunnel lining method in the Nord construction method, and in particular, tunnel lining with cast-in-place concrete without using segments, which are precast members. Regarding the in-situ lining method for shield tunnels.

``Prior art and its problems J In the general shield construction method, the primary lining of a tunnel excavated by a shield machine is made of steel or (
Precasting was performed by assembling concrete members called segments into a cylindrical shape inside the shield machine.

However, primary lining using this segment is expensive;
This was a factor that raised the overall construction cost.

In recent years, a cast-in-place lining method has been developed in which the tunnel is lined by pouring inexpensive cast-in-place concrete onto the inner wall of the tunnel, instead of performing the primary lining using the aforementioned segments. A construction method known as tsunami has been proposed and implemented. For example, as shown in FIG. 15, an inner formwork 2 having an inner diameter smaller than the inner surface of the excavated surface of the ground G is assembled inside the shield machine 1 behind the shield jack 3, and this shield machine 1 and the inner formwork 2 are assembled inside the shield machine 1 behind the shield jack 3. In this construction method, the tunnel is lined by filling and pouring cast-in-place concrete 4 into the left space, and the inner formwork 2 is used as a propulsion reaction platform for the shielding machine 1. However, in this cast-in-place lining construction method, as described above, the cast-in-place concrete 4 is filled and poured behind the shield jack 3, so the inner form 2 is connected to the curing form for the cast-in-place concrete 4 and the shield machine 1. It is necessary to also serve as the propulsion and reaction force table.

Therefore, in the above construction method, since the structure of the inner formwork 2 requires great rigidity, the self-weight of the inner formwork 2 increases, and it takes time and effort to assemble and remove it, resulting in poor work efficiency. I had a point. In addition, in the above construction method, when pouring concrete 4 at the rear of the shield jack 3, the gable frame 6 that closes the space between the shield jack 1 and the inner formwork 2 in front of it is used for placing concrete. Similarly, since it had to be installed each time, it was time-consuming for the formwork worker. From the above, the conventional cast-in-place lining construction method has the above-mentioned problems. This could not be an effective solution to the two problems.

This invention was made in view of the above-mentioned problems, and it not only makes it possible to line tunnels with inexpensive cast-in-place concrete, but also saves time and effort in the work.
The objective is to provide a method for in-situ lining of shield tunnels that can improve work efficiency.

"Means for Solving the Problems" Therefore, the present invention provides a method for lining the inner wall of a tunnel excavated by a shield machine with cast-in-place concrete, in which the tip of the skin plate of the shield machine is An outer cylinder having a larger diameter than the skin plate is provided in the shield machine, and a concrete injection pipe is provided in the skin plate that opens between the outer cylinder and the tip of the skin plate. A process of assembling a cylindrical formwork having an outer diameter approximately equal to the outside diameter and taking a reaction force to the formwork to excavate another mountain using the shield machine, and a process of excavating the ground using the shield machine. After that, by alternately repeating the step of placing the cast-in-place concrete between the outer cylinder and the tip of the skin plate, a pour-in-place method for shield tunnels is performed in which the inner wall surface of the tunnel is lined. Configure
This solves the above problems.

Here, it is preferable that the formwork is configured to be divisible in the circumferential direction and the axial direction. Alternatively, it is preferable that the formwork is configured to be expandable and retractable in its radial direction and to be movable in the direction after the tunnel is erupted.

Furthermore, on the surface of the skin plate of the shield machine,
It is also preferable to provide a separation membrane that reduces adhesion between the hardened cast-in-place concrete and the shielding machine.

"Function" In this invention, an outer cylinder having a larger diameter than this is provided at the tip of the skin plate of the shielding machine, and a concrete injection pipe that opens between the skin plate and the outer cylinder is provided, so that it is possible to pour concrete into the field. The installation location is between the outer cylinder and the skin plate, and therefore, this cast-in-place concrete is exposed behind the skin plate of the shielding machine in a sufficiently hardened state, which reduces the time and effort required to arrange the formwork to be installed behind the shielding machine. This eliminates the need for a rigid structure for this formwork.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a shielding machine used in a shield tunnel lining method in place, which is an embodiment of the present invention. In FIG. 1, the reference numeral 10 indicates the entire Nord machine, and the reference numeral 11 indicates the skin plate that is the outer shell of the shield machine 10, and the shield 1410 excavates the ground G in one direction (leftward in the illustrated example). A tunnel T is formed behind the shield machine 10, and a concrete lining 30 is formed on the inner peripheral surface of the tunnel T, thereby lining the tunnel T.

A skin plate is provided at the tip of the skin plate 11 so as to cover it! An outer cylinder 12 having a larger diameter than (2) is provided. The tip of the skin plate 11 is closed by a partition plate 13 provided substantially perpendicular to the axis of the skin plate 11, and the partition plate 13 allows the skin plate 11 and the outer cylinder I2 to be closed at both tip ends. It is joined at. A concrete injection pipe I5 for pouring cast-in-place concrete 31 between the outer cylinder 12 and the skin plate 11 is attached to the tip of the skin plate 11. This concrete injection pipe 1
5, concrete placement is controlled by a valve 16 provided in the middle thereof, and is connected to a concrete injection plant (not shown) installed on the ground or the like as required. Furthermore, at the tip of the skin plate II, a fifth
As shown in the figure, a slit 32 is formed through which a tubular water-impermeable coating (separation membrane) 33 for reducing the adhesive force between the concrete lining 30 and the skin plate 11 is delivered.

The shield machine IO has that skin plate ■! A support ring 17 is provided in the middle of the inner peripheral surface, and this support ring 1
7, a plurality of propulsion glossy units 18, 18, . . . are fixed at intervals in the circumferential direction. Also, behind this shield machine 10, there is a concrete 30
An inner formwork 19 having a substantially cylindrical outer shape and serving as a curing form is installed,
Working end 18aS of the propulsion jack I8.18,...
18a, - are in contact with the front end of this inner formwork 19.

The inner formwork I9 is formed into a substantially cylindrical outer diameter whose outer diameter is substantially equal to the outer diameter of the skin plate 11, and a plurality of inner formworks in the circumferential direction and the axial direction (in the illustrated example, in the circumferential direction). 8 divisions) Divided gutter-shaped division body 20.20,・
It is composed of a collection of...

This divided body 20, as shown in FIGS. 2 to 4,
A frame plate 2I is formed by dividing a cylindrical steel plate into a plurality of pieces in the circumferential direction, and a frame plate 2I is attached along the front end of this frame plate 21 and is formed by dividing a ring-shaped square steel pipe into a plurality of pieces in the circumferential direction. Reinforcement ring 22 and frame board 2! It is composed of a cross section 23 made of H-beam steel that is removably attached along the longitudinal direction.

These divided bodies 20, 20, . . . are adjacent divided bodies 2
0.20 are respectively bolted together and assembled to form an inner frame 19 having a generally cylindrical outer shape as shown in the figure. At this time, 23.23,... is the inner formwork 19
A suppression jack 24 is disposed between these passing beams 23 and 23 in a straight line along the axis. Further, the passage beams 23, 23, . , its circumferential position is adjusted. With the above configuration, the inner formwork 19 is expanded outward as a whole by the expansion of the suppressing jacks 24, and is pressed against the inner circumferential surface of the lining concrete 30, thereby forming the tunnel T.
fixed inside. Therefore, the shield machine l is propulsion jack! 8, I8, . . . due to the expansion of the inner formwork 19.
By taking a reaction force to , it is possible to propel itself in one direction (to the left in the illustrated example). Moreover, the code 25 is
This is a cutter device installed at the front of the Rudo machine to excavate the ground G.

Next, with reference to FIGS. 7 to 10, a method for covering a shield tunnel in place, which is an embodiment of the present invention, will be described.

(i) First, as shown in FIG. 7, the inner formwork 19 is installed immediately behind the shield machine IO, and the suppression jack 2
4, this inner formwork 19 is fixed within the tunnel T.

(11) Next, as shown in FIG. 8, the propulsion jacks 18, 18, etc. of the shield machine 10 are extended to take a reaction force to the inner formwork 19 and move the entire shield machine 10 in one direction ( The cutter device 25 provided at the front of the shield machine 10 excavates the ground G while propelling the shield machine 10 (leftward in the illustrated example), and the shield machine IO excavates the ground G. At the same time, the tubular water-impermeable coating 3 is inserted through the slit 32.
3 and skin play with this coating 33) 11
Therefore, the adhesion force between the lining concrete 30 and the shielding machine IO is reduced, making it easier for the shielding machine IO to dig.

(iii) After the shield machine IO has dug a predetermined distance in the ground G, the shield machine IO stops digging, and the propulsion jack 18.18 is shortened as shown in FIG. Then, a gap corresponding to one propulsion distance of the shield machine IO is created between the propulsion jacks 18, 18, . . . and the inner formwork 19. Therefore, as shown in FIG. 1O, by assembling the divided bodies 20, 20, . At the same time, the concrete injection pipe! 5, the skin plate 111 outer cylinder 12,
Filling the closed space 14 surrounded by the partition plate 13 and the tip of the concrete lining 30 with cast-in-place concrete 31,
Pour concrete. Here, the tubular coating 33 forms a separation membrane on the surface of the skin plate 11 in close contact with the skin plate 11 due to the pressure of the cast-in-place concrete 31.

(1v) After this, repeat the steps (1) to (mountain) above to apply the cast-in-place concrete 31 to the inner peripheral surface of the tunnel T.
While pouring, the ground G is excavated by the shield machine IO, and the lining concrete 30 is formed on the inner peripheral surface of the tunnel T.

Therefore, according to the method described above, by providing the outer cylinder 12 with a larger diameter at the tip of the skin plate 11 of the shielding machine IO, this outer cylinder 12 can be used to form the outer shape of the cast-in-place concrete 31. As a frame, also skin plate 1
1 acts as an inner formwork, by placing cast-in-place concrete 31 between the outer cylinder 12 and the skin plate 11, the inner circumferential surface of the tunnel T can be lined.

At this time, since the cast-in-place concrete 31 is placed at the tip of the skin plate II of the shield machine 10, at the stage where the cast-in-place concrete 31 is exposed as lining concrete 30 behind the skin plate 11 of the shield machine 10, This lining concrete 30 has also sufficiently hardened. Therefore, the work of installing the inner formwork I9 on the inner surface of the concrete lining 30 is extremely simplified compared to the conventional cast-in-place lining construction method. At the same time, since the lining concrete 30 has sufficiently hardened, the inner formwork 19 only has to function mainly as a propulsion and reaction platform for the shielding machine 10, and can be used as a curing formwork as in the conventional case. does not require a rigid structure. Therefore, from this point of view as well, the time and effort required for formwork installation work etc. is greatly reduced. Furthermore, when the cast-in-place concrete 31 is placed, the cast-in-place concrete 31 is placed in the closed space 14 surrounded by the tips of the skin plate 11, the outer cylinder 12, the partition plate 13, and the lining concrete 30, as described above. Since it is poured, a formwork for the cast-in-place concrete 31 is not required, and the work effort is much reduced from this point of view as well. Therefore, according to this embodiment, it is possible to line the tunnel T with inexpensive cast-in-place concrete 3I, and it is also possible to construct a shield tunnel that does not require much effort and improves work efficiency. It is possible to realize the in-situ roofing method.

Next, FIGS. 1I to 14 are diagrams for explaining a method for covering a shield tunnel in place, which is another embodiment of the present invention. In the following description, the same components as those in the embodiment described above will be denoted by the same reference numerals, and the description thereof will be omitted.

The difference between the pour-in-place construction method of this embodiment and the pour-in-place construction method of the previous embodiment is the structure of the inner formwork 19. That is,
The inner formwork 19 includes a frame plate 21 having a substantially cylindrical outer shape, a plurality of annular reinforcing rings 22, 22, etc. arranged along the circumferential direction of the inner peripheral surface of the frame plate 21, A plurality of strips 23, 23, . . . are arranged along the axial direction of the inner peripheral surface of the plate 21.
・It is composed of. This inner formwork 19 is
The frame plate 21 is divided into a plurality of parts (four parts in the illustrated example) along the axial direction, and is divided in the axial direction.
Adjacent ones of the divided frame plates 21 are connected to each other by suppression jacks 24, 24, . . . . As a result, this inner formwork 19 has compression jacks 24, 24,
It is configured to be expandable and contractible in the radial direction according to the expansion and contraction of .... Furthermore, wheel mechanisms 26 and 26 are detachably attached to the inner formwork 19 for moving it in the front-rear direction of the tunnel T along the inner circumferential surface of the concrete lining 30.

The in-situ lining method for the shield tunnel in this example is as follows:
This is almost the same as that of the previous embodiment. That is, (i) First, as shown in Figure 11? This inner formwork 19 is fixed within the tunnel T by installing the inner formwork 19 immediately behind the shield machine 10 and extending the suppression jack 24.

(11) Next, the shield machine IO propulsion jack I8.1
8, . The earth G is excavated by a cutter device (not shown), and the excavation work of the earth G is performed by the shield machine 10.

(iii) After the shield machine IO excavates a predetermined distance # in the ground G, the excavation of this shield machine 10 is stopped and the propulsion jack 18.18 is shortened. Then, propulsion jack 1
8. Shield machine IO between 18,... and inner formwork ■9
A gap corresponding to the distance of one propulsion is created. Therefore, the first
As shown in Fig. 3, after the inner form frame 19 is contracted radially inward by shortening the pressing jacks 24, 24, . A wheel mechanism 26, 26 is attached to 9 to move this inner formwork 19 forward. At the same time, in front of the knoll machine 1 (not shown), the skin plate 11 is filled with a concrete injection pipe. The closed space surrounded by the outer cylinder, the partition plate, and the tip of the concrete lining 30 is filled with cast-in-place concrete and poured.

(1v) After that, repeat the steps (1) to (iii) described in Moe, and while pouring cast-in-place concrete on the inner peripheral surface of the tunnel T, excavate the ground G with the shield machine IO, A concrete lining 30 is formed on the inner peripheral surface of this tunnel T.

Therefore, this embodiment also provides the same effects as the previous embodiment, and makes it possible to line the tunnel T with inexpensive cast-in-place concrete. It is possible to realize an in-situ lining method for shield tunnels that can improve efficiency.

It should be noted that the in-situ lining method for shield tunnels of the present invention is not limited to the materials, shapes, etc. of the various components for realizing this method, and various modifications are possible.

"Effects of the Invention" As explained in detail above, according to the present invention, the place where cast-in-place concrete is placed is between the skin plate and the outer cylinder provided at the tip of the skin plate of the shielding machine. This cast-in-place concrete is exposed behind the skin plate of the shielding machine in a sufficiently hardened state. Therefore, the work of installing the inner formwork on the inner surface of the concrete becomes extremely simple compared to conventional construction methods. At the same time, the inner formwork only needs to function primarily as a propulsion and reaction platform for the shield machine, and does not require a rigid structure as a curing formwork as in the prior art. Therefore, from this point of view as well, the time and effort required for formwork installation work etc. is greatly reduced. Furthermore, when pouring concrete on-site, there is no need for formwork for pouring-on-site concrete, so the work effort is greatly reduced in this respect as well. Therefore, according to the present invention, it is possible to perform tunnel lining with inexpensive cast-in-place concrete, and the site lining of a shield tunnel can be done without much effort and can improve work efficiency. construction method can be realized.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a shielding machine used in the in-situ lining method for shield tunnels, which is an embodiment of the present invention, and Figs. 2 to 4 show the inner formwork used in the same lining method. 2 is a side view, FIG. 3 is a front view, FIG. 4 is a sectional view taken along line IV-IV' in FIG. 3, and FIG. 5 is a diagram showing the divided body; FIG. FIG. 6 is an enlarged cross-sectional view of the vicinity of the skin plate of the face shield machine, and FIGS. 7 to 1O are one embodiment of the present invention. Figures 11 to 14 are diagrams for explaining a shield tunnel lining method in place, and Figures 11 to 14 are diagrams illustrating a shield tunnel lining method in place, which is another embodiment of the present invention. is a sectional view showing a conventional cast-in-place lining construction method. T...Tunnel 10...Shield machine, 11...Skin plate, I2...Outer cylinder, 15...Concrete injection pipe, 19. ...Inner formwork (formwork), 31
...Cast-in-place concrete, 33...
Coating (separation membrane).

Claims (4)

[Claims] (1) A shield tunnel lining method in which the inner wall surface of a tunnel excavated by a shield machine is lined with cast-in-place concrete, and the tip of the skin plate of the shield machine has a diameter larger than that of the skin plate. In addition to providing an outer cylinder, this skin plate is provided with a concrete injection pipe that opens between the outer cylinder and the tip of the skin plate, and a cylinder having an outer diameter approximately equal to the outer diameter of the skin plate is installed at the rear of the shield machine. A step of assembling a shaped formwork and taking a reaction force to the formwork to excavate the ground using the shield machine, and after the step of digging the ground using the shield machine, the outer cylinder and the tip of the skin plate are removed. A pour-in-place lining method for shield tunnels, characterized in that the inner wall surface of the tunnel is lined by alternately repeating the step of placing the cast-in-place concrete in between. (2) The method for in-place lining of shield tunnels according to claim 1, characterized in that the formwork is configured to be divisible in the circumferential direction and the axial direction. (3) The location of the shield tunnel as set forth in claim 1, wherein the formwork is configured to be expandable and contractible in its radial direction and to be movable in the front and back direction of the tunnel. Covering method. (4) A separation membrane is provided on the surface of the skin plate of the shielding machine to reduce adhesion between the hardened cast-in-place concrete and the shielding machine. The in-situ lining method for shield tunnels described in Section 3.