JPH044075Y2 - - Google Patents

Description

[Detailed description of the invention] ``Field of application of the invention'' This invention relates to a PC board mounting structure for repairing existing tunnels by lining them.

``Problems that conventional technology and ideas cannot solve'' Conventionally, as a construction method for repairing an existing tunnel, the existing concrete surface is partially chipped off within an area where there is no risk of collapse, and mortar is poured into the chipped area. In addition, a method is generally adopted in which the adjacent parts are removed and the entire repair is performed by successively performing similar 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.

Therefore, the applicants et al. created recesses in the side wall of the existing tunnel at predetermined intervals, supported and fixed the fixing protrusions at the lower end of the PC board built along the existing concrete surface in these recesses, and By joining the PC board at the top and filling the gap between the PC board and the existing concrete surface with a consolidating material in this state, chiseling work and mortar placement work that require a great deal of labor and time can be greatly reduced. We have developed a rational repair method that makes it possible to reduce the construction cost and construction period through a simple and continuous process.

This idea proposes a mounting structure that allows the lower end of the PC board in the repair method to be easily and reliably positioned and fixed to the existing concrete.

``Example'' Below, an example of this invention shown in the drawings will be described. As shown in FIGS. 1 and 2, the side wall portion 1b at the base end of the arch portion 1a of the existing concrete 1 is provided with predetermined intervals along the tunnel direction. A rectangular recess 2 with a flat bottom surface is formed by partially chipping each other.
There are many.

A waterproof sheet 3 is attached to the arch portion 1a,
Furthermore, as shown in FIG. 4, a pair of left and right PC boards 4 and 4' are built in the shape of the arch 1a between the recess 2 and the top of the tunnel, and the lower ends of the PC boards 4 and 4' are placed in the recess 2. The arch portion 1a is fitted into the arch portion 1a and supported, and their upper ends are joined at the top end of the arch portion 1a. These PC boards 4, 4' are set on a diagonal jack up device 6 or the like installed on a lifting device 5 such as a forklift that can run and rotate freely, so that a certain gap K is created between the PC boards 4 and 4' and the arch part 1. Built on the left and right sides of the arch section 1.

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, height adjustment bolts 16 screwed into vertical embedded inserts 15 are protruded from the lower surfaces of the fixing projections 9, 9, and are first fixed when installing the PC boards 4, 4'. Inserting the protrusions 9, 9 into the recess 2,
The vertical position is adjusted by screwing in the height adjustment bolt 16 and supported on the bottom surface of the recess 2.

Further, a horizontal position adjustment bolt 18 screwed into a horizontal embedded insert 17 is provided protrudingly on the lower end surface of the PC board 4, 4' between the left and right fixing protrusions 9, 9. When the PC board 4 is inserted into the recess 2, the positioning of the recess 2 in the depth direction is adjusted and the PC board 4,
Adjust the support position of 4'.

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 the PC boards 4, 4' are erected, the subsequent PC boards 4, 4' are successively erected in the front and back, and the fixed convex portions 9 of the adjacent front and rear PC boards 4, 4' are adjacent to each other. , 9 into the recess 2 into which the fixing convex parts 9, 9 are fitted are injected and filled with a solidifying agent 20 such as mortar, and the fixed convex parts 9, which are adjacent to each other, are integrally fixed to the existing concrete. In addition, the adjacent front and rear 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.

Furthermore, after the lining with the PC boards 4, 4' is completed, a consolidating material 22 such as air mortar is filled in the gap K between the existing concrete 1 and the PC boards 4, 4', and the existing concrete 1 and the PC boards 4, 4, 4' is consolidated and integrated.

``Effects of the invention'' As described above, according to this invention, PCs are built along the existing concrete surface into recesses formed by partially cutting out the side wall of an existing tunnel at predetermined intervals along the tunnel direction. Fitting fixing protrusions protruding from the front and rear of the lower end of the plate into the adjacent recesses,
The fixing protrusion is supported on the bottom surface of the recess via a height adjustment bolt protruding downward from the lower surface thereof, and the fixing protrusion is fixed by a solidifying material filled in the recess. On-site construction work such as chiseling and mortar filling work, which requires labor and time, is greatly reduced, and it is possible to fix the product with a simple process that looks good without showing any hardware, etc.
It can be accurately positioned and fixed on the uneven surface of the inner surface of the recess due to chiseling.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing the chiseled state of existing concrete, Figure 2 is a front view of the same part, Figure 3 is a perspective view of the PC board according to this invention, and Figure 4 is 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 state, Figure 7 is a cross-sectional view of the same, and Figure 8 is the top end. FIG. 9 is a partial longitudinal sectional view showing the state of the part, 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, 9...fixing convex portion, 16...height adjustment bolt,
20...Scattering agent.

Claims (1)

[Scope of utility model registration request] Inside the recesses formed by partially cutting out the side wall of the existing tunnel at predetermined intervals along the tunnel direction,
A height adjustment bolt in which fixing protrusions protruding from the front and back of the lower end of the PC board built along the existing concrete surface are fitted into the respective adjacent recesses, and the fixing protrusions are made to protrude downward from the lower surface of the fixing protrusions. A mounting structure for a PC board for repairing an existing tunnel, characterized in that the fixing protrusion is supported on the bottom surface of the recess through the concave portion, and the fixing convex portion is fixed by a consolidating material filled in the recess.