JPH0410559B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for repairing an existing tunnel, and particularly to a method for easily repairing an existing tunnel using a PC board.

``Prior art and problems to be solved by the invention'' This type of conventional construction method involves partially chipping off the existing concrete surface to the extent that there is no risk of collapse, and then pouring mortar into the chipped area. In addition, a method is generally adopted in which the adjacent parts are hacked out and the entire repair is carried out by successively repeating the same steps.

However, with this construction method, chiseling work and mortar casting work require a great deal of labor and time, and since chiseling work and mortar casting work are performed alternately, construction is complicated and increases construction time and costs. There were problems such as not having one.

"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention has the following features:
The side wall of the existing tunnel is partially cut out into recesses at predetermined intervals, and in these recesses, the fixing protrusions at the lower end of the PC board built along the existing concrete surface are supported and fixed, and the PC board is fixed at the top. By joining the PC board and filling the gap between the PC board and the existing concrete surface with a consolidating material in this state, the chiseling work and mortar casting work, which require a great deal of labor and time, can be greatly reduced, making it simple and easy to use. This project proposes a rational repair method that makes it possible to reduce construction costs and construction times through a continuous process.

``Example'' Below, an explanation will be given of an example of the present invention shown in the drawings.The illustrated example shows an example of construction of an arch part of an existing tunnel. The side wall portion 1b at the base end of the arch portion 1a is partially cut out at predetermined intervals along the tunnel direction, and a number of rectangular recesses 2 with flat bottoms are provided. In this case, since the arch portion 1a and the side wall portion 1b of the existing concrete 1 are continuous between the adjacent recesses 2, 2, it is possible to chip over a considerable distance without causing any risk of collapse.

Next, a waterproof sheet 3 is applied to the entire surface of the arch portion 1a.
Attach the recess 2 as shown in Figure 3 in this state.
A pair of left and right PC boards 4, 4' formed in a shape that follows the arch part 1a between the top of the tunnel and the top of the tunnel is carried into the tunnel, and a diagonal jack is installed on a lifting device 5 such as a forklift that can travel and rotate freely. Device 6
etc., and leave some distance K between it and the arch part 1.
It is built on the left and right sides of the arch part 1 so as to create the following.

As shown in FIG. 3, the PC plates 4, 4' have a joint recess 7 on one side and a joint protrusion that engages with the joint recess 8 on the other side, on the top side joint end surface. It is formed into a rectangular plate with fixed protrusions 9, 9 protruding from the front and rear of the lower end that can be fitted into the recess 2, and an injection port 10 is provided at a required position, and a joint metal fitting 11 is provided on the front and rear end faces. It is being

Concave and convex joints 12 and 1 are provided on the front and rear joint end surfaces of the joint recess 7 and the joint protrusion 8, as well as on the bottom surface of the joint recess 7 and the tip surface of the joint projection 8, which form a pin connection.
2' are provided, and the joint ends 1 at the front and rear of the joint recess 7
3, 13 and the joint protrusion 8 are provided with through holes 14, 14' which communicate with each other in the front-rear direction when the joint recess 7 and the joint protrusion 8 are engaged with each other.

As shown in FIG. 5, a height adjustment bolt 16 screwed into a vertical embedded insert 15 is protruded from the lower surface of the fixing convex portions 9, 9, and when inserted into the concave portion 2, the height adjustment bolt 16 adjusts the height of the PC board 4, 4'. It is designed so that it can be supported on the bottom surface of the recess 2 by adjusting its position. In addition, the PC board 4 between the left and right fixing convex parts 9,
4' has a horizontal recessed insert 17 on the lower end surface.
A horizontal position adjustment bolt 18 screwed into the PC board 4 is protruded, and when the fixing protrusions 9, 9 are fitted into the recess 2, the positioning of the recess 2 in the depth direction is adjusted.
The support position of 4' can be adjusted.

In this way, the adjustment bolt 1 is
6 and 17, while adjusting the position of the lower ends of the PC boards 4 and 4', engage the joint convex part 8 in the joint recess 7 at the joint part of the top end, and align the uneven joint on the mutually facing surfaces. 12 and 12' and in this state insert the PC steel rod 19 into the through holes 14 and 14' in series, it can be reliably positioned front to back, left and right, and up and down, and bent around the PC steel rod 19. This allows for safe jointing without falling off or shifting under loads in any direction.

After erecting one set of PC boards 4, 4', the following PC boards 4, 4' are successively erected in the front and back, and fixed protrusions adjacent to each other on the adjacent front and rear PC boards 4, 4' are installed. A cementing agent 20 such as mortar is injected and filled into the recess 2 into which the parts 9 and 9 are fitted, and the adjacent fixed protrusions 9 are integrally fixed to the existing concrete. In addition, the adjacent PC boards 4 and 4' are
The joint metal fittings 11, 11 are integrally fastened to each other by bolts 21 at the joint surfaces.

After completing the lining with the PC boards 4, 4' in this way, the gap K between the existing concrete 1 and the PC boards 4, 4' is filled with a consolidating material 22 such as air mortar. 4 and 4' are consolidated and integrated.

If the side wall 1b needs to be repaired and there is a margin within the construction limit, fix the side wall PC board to the side wall 1b by using the chiseled recess in the same way, and attach this to the PC boards 4, 4'. It is also possible to continuously join and integrate them.

"Effects of the Invention" As described above, according to the present invention, the side wall of an existing tunnel is partially cut out at predetermined intervals to form recesses, and the lower end of the PC board built into the recesses along the existing concrete surface. While supporting and fixing the convex part of
The PC board is joined at the top, and in this state, the gap between the PC board and the existing concrete surface is filled with consolidation material, which eliminates on-site construction work such as chiseling and mortar filling work that requires a great deal of labor and time. It is possible to significantly reduce the number of tunnels and repair it as a well-finished tunnel using a simple and continuous process, and it is also possible to reduce the construction cost and construction period.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing the chiseled state of existing concrete, Fig. 2 is a front view of the same part, Fig. 3 is a perspective view of the PC board according to the present invention, and Fig. 4 shows the installed state of the PC board. Figure 5 is a vertical cross-sectional view showing the installed state of the lower end of the PC board, Figure 6 is a vertical cross-sectional view showing the completed construction, Figure 7 is a cross-sectional view of the same, and Figure 8 is the top end. FIG. 9 is a partial longitudinal cross-sectional view showing the state of FIG. 9, and FIG. 9 is a bottom view of the same. 1... Existing concrete, 1a... Arch part,
1b...Side wall part, 2...Recessed part, 4, 4'...PC
Plate, 7...Joint recess, 8...Joint protrusion, 9...Fixing protrusion, 20...Cagulating agent, 22...Cagulating agent, K...
…gap.

Claims (1)

[Claims] 1. A step of partially cutting out the side wall of the existing tunnel at predetermined intervals along the tunnel direction to form the required recesses, and a pair of left and right recesses formed in a shape that follows the existing concrete surface between the recesses and the top of the tunnel. A PC board is erected with a predetermined gap maintained between it and the existing concrete surface, and the fixing convex part provided at the lower end of the PC board is fitted and supported in the recess, and the upper ends of the left and right PC boards are connected through joints. A method for repairing an existing tunnel, which comprises a step of joining each other, and a step of filling a consolidating material into the gap between the fixing convex part and the concave part, and the gap between the existing concrete surface and the PC board.