JPH0320399Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a joining device for PC boards for tunnel lining.

In recent years, the applicant has adopted a lining construction method for mountain tunnels, etc., in which the load of the ground is supported by shoring, and then a PC lining board is erected between the supports, and this is used as a formwork to connect the ground and PC lining. Formwork and decorative mortar are created by filling the gap between the board and the board with a hardening agent such as backfill concrete, and by taking the load of the ground by combining the hardening agent and the PC lining board. We are currently developing a simple tunnel lining method that does not require any coverings.

By the way, generally when constructing a tunnel using PC boards, the PC boards are assembled sequentially from the left and right side walls of the ground to form an arch shape such as a circular or horseshoe shape. It is not easy to fit the PC boards together and connect them to each other, and dimensional errors and construction errors of the PC boards are concentrated at the final joint, making it difficult to obtain a predetermined assembly accuracy in many cases.

In order to solve the problems in tunnel construction using the above-mentioned tunnel lining method, this idea was developed to have a joint structure that makes it easy to assemble the PC boards and allows for strong integration while correcting errors at the final joint of each PC board. This is what we propose.

An example of this invention shown in the drawings will be described below. The PC board 1 is an arc-shaped rectangular board that follows the circumferential surface of the ground, and has upward protrusions on the peripheral edge of the outer surface that constitutes the outer circumferential surface of the tunnel lining. The inner surface of the protrusion 2, which is formed along the side joint end surfaces on both end edges in the arcuate direction, has a downwardly sloped slope from the upper end to the lower end.

In addition, a concave groove 4 such as an arc shape is formed in the board thickness direction at a predetermined position on the side joint end surface of the PC board 1 including the outer surface of the protrusion 2, and corners of the side joint end surface and the bottom surface are formed. A semicircular or rectangular notch-shaped recess 5 is provided at the corner where the groove 4 is formed.

A plurality of PC boards 1 are sequentially installed along the surrounding wall of the ground and assembled in an arch shape, etc., and the two left and right PC boards 1, 1 are finally assembled at the top of the tunnel, etc. at the side joint end faces adjacent to each other. Projection part 2,
The coupling member 6 is placed across the space between the two.

The coupling member 6 includes a rectangular top plate 6a and a downwardly sloped slope (projection 2) extending outward from both ends of the top plate 6a.
The side plates 6b, 6b are formed into a groove shape in cross section, and are formed by the side plates 6b, 6b, which have a figure-eight shape and hang down with the same inclination as the inner surface of the PC board 1.
2 so as to integrally straddle it.

A bolt 7 is suspended from the top plate 6a of the coupling member 6 with its upper end connected and fixed. is inserted into the gap, and the lower end thereof is made to protrude into the concave space between the opposing concave portions 5, 5.

In this state, a nut 9 is screwed into the other end of the bolt 7 via a washer 8, and the connecting member 6 is tightened to pull the protrusions 2, 2 toward each other, thereby tightening the PC boards 1, 1. join each other together.

Therefore, by adjusting the tightening of the nut 9, it is possible to adjust the pulling amount, adjust the relative spacing between the PC boards 1, 1, and correct assembly errors.

On the other hand, when it is necessary to adjust the distance between the PC boards 1 and 1 to increase the distance between them, the washer 8 This wedge body 10 is inserted from below into the gap between the facing grooves 4, 4, and the wedge body 10 is pushed in by rotating and tightening the nut 9, and the wedge effect causes the PC board to 1, 1 can be widened, and thereby an axial force can be introduced to the entire PC board 1.

In this case, when the wedge body 10 is used exclusively for adjusting the distance between the PC boards 1, 1,
A member with a wide interval between the left and right side plates 6b of the connecting member 6, or a simple flat plate with only the top plate 6a is used, so that the PC boards 1 can sometimes move freely in opposite directions.

Alternatively, the wedge body 10 may be provided on the bottom surface of the top plate 6a of the coupling member 6 and pushed into the gap between the grooves 4 from above by tightening the bolt 7.

Note that the above-mentioned connecting member 6 and wedge body 10 should be used at the top end to be installed last in order to expect a water-stopping effect in the gap between the PC boards 1 and 1 using the connecting member 6 as an umbrella.
It is desirable to use it for joining PC boards 1 and 1, but
It can also be used to connect not only the top end but also the PC boards 1, 1 which are successively connected in the circumferential direction.
In addition, a PC connected to this coupling member 6 in the front and back direction is also used.
It can also be used to connect the plates 1 and 1.

After assembling the PC board 1 in this way, the recess 5 from which the bolt 7 protrudes is filled with mortar 11 to embed the bolt 7, and the joint between the PC boards 1 and 1 is filled with joint mortar. , it is possible to finish the tunnel with a good appearance without exposing any metal fittings such as bolts on the inner surface of the tunnel, and the bolt 7
Hanging hardware etc. can also be connected to the lower end of the holder.

[Effects of the invention] As described above, according to this invention, by tightening the bolt with the nut through the washer to tighten the connecting member, the protrusions of the left and right PC boards can be tightened so as to draw them toward each other in the relative direction. , the PC boards to be assembled at the end of the tunnel lining are firmly connected to each other, and by adjusting the tightening of this nut, the amount of pull can be adjusted, the relative spacing of the PC boards can be adjusted, and assembly errors can be corrected. By filling the holes with mortar etc. and embedding the bolts, and filling the joints between the PC boards with joint mortar, it is possible to finish the tunnel with a good appearance without any bolts or other metal fittings being exposed on the inner surface of the tunnel. Hanging hardware etc. can also be connected to the lower end of the holder.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view showing the joint structure of this invention.
FIG. 2 is a longitudinal sectional view showing a joining structure according to another embodiment, and FIG. 3 is a partial plan view showing a joining structure according to another embodiment. 1...PC board, 2...Protrusion, 4...Concave groove, 5
... recess, 6 ... coupling member, 6a ... top plate, 6b
...Side plate, 7...Bolt, 8...Washer, 9
...Natsuto.

Claims (1)

[Scope of utility model registration request] Left and right arc-shaped with side joint end faces facing each other.
The PC board is provided with an upward protrusion on the side edge of the outer surface thereof, the inner surface of which slopes downward from the upper end to the lower end along the side joining end surface,
Concave grooves are provided facing each other in the board thickness direction at predetermined positions on the opposing side joint end faces, and notch-shaped grooves are provided at the corners of the side joint end faces and the bottom surface of the PC board at the positions where the concave grooves are formed. A recess is provided, and a connecting member having a groove-shaped cross section in which the side plates hanging down from both sides of the top plate mutually form a figure-eight shape is fitted over the two adjacent protrusions. A bolt whose upper end is connected to the top plate is suspended through the gap between the recessed grooves, and the connecting member is tightened by a nut screwed into the lower end of the bolt protruding between the opposing recesses through a washer. A joining structure of PC boards for tunnel lining, characterized in that the adjacent protrusions are tightened between side plates of a joining member.