JPH0521596Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of use of the invention" This invention is a PC board for repairing and lining existing tunnels and for interior lining of newly constructed tunnels.
This concerns the joint structure of PC plates in lining structures.

``Prior art'' Generally, tunnels are exposed to external forces such as the movement of trains, wind pressure during typhoons, vibrations caused by earthquakes, deformation forces in various directions, and collisions with equipment and movement of the ground. Therefore, when lining the inner surface of a tunnel by combining PC boards, it is necessary to ensure safety against these external forces, and it is also necessary to interpose a sealant on the joint surface to ensure complete water-tightness. be.

Conventionally, a common joint structure for PC panels has been to provide a box cutout near the joint and then tighten the box cutouts with a bolt. However, this has the problem of reduced strength due to cross-sectional loss, and has the disadvantage that it is difficult to adopt for PC panels with thin plate thickness.

``Means for solving the problem'' In order to solve the above-mentioned conventional problems, this invention has a vertical insert that opens into a counterbore hole provided on the surface of the PC board, and a perpendicular insert that communicates with this insert. A steel joint sleeve that is fixed and has one end opened at the joint end surface of the PC board is buried in the PC board,
By inserting a series of joint steel bars into the joint sleeves of the joined PC boards whose openings match each other, and pressing the bolts screwed into each insert into the joint steel bars, the joints in tunnel lining with PC boards can be created. In addition to satisfying the safety and water-tightness of the PC board, it is possible to reliably join the PC board with the sealant tightened without causing the problem of cross-section loss by using the mounting hole of the erector for installing the PC board. This paper proposes a rational joint structure.

``Example'' Below, an example of this invention shown in the drawings will be described. A plurality of counterbore holes 2 are provided on the surface of the PC board 1 at predetermined positions near the joint end face in the span direction.
Directly below this counterbore hole 2, a female threaded insert 3 with one end open at the bottom thereof is vertically buried.

Further, within the PC board 1, a steel joint sleeve 4, which is integrated at right angles and communicates with the insert 3, is buried perpendicularly to the joining end face of the PC board 1 in the span direction with its tip opening. ing.

The PC board 1 configured as described above is attached to the installation erector at its insert 3, and one ring is constructed by joining four boards in the ring direction using a nutkuru joint or the like, as shown in FIG. 4, for example. Each subsequent PC board 1 is sequentially joined in the span direction to each PC board 1 installed previously to form a ring.

For such joining, a joint steel rod 5 having a circular or square cross section with a length approximately twice the depth is inserted in advance into the joint sleeve 4 of either the preceding PC board 1 or the succeeding PC board 1. Then, the forwardly protruding tip portion is inserted into the other joint sleeve 4 and joined.

An elastic sealant 6, 6' is interposed between the joining end surfaces of the PC boards 1 and 1 to be joined, and the subsequent PC boards 1 and 1 are
The rear ends of the plates are pressed by a pressure device so that they are crimped together, and in this crimped state, bolts 7 are screwed into the corresponding inserts 3, and their tips are clamped to the joint steel rod 5 to fix both ends. .

As a result, the front and rear PC boards 1, 1 are strongly joined together via the joint steel rod 5 with the sealing materials 6, 6' pressed together.

In this case, the joint steel material 5 is provided with an engagement recess 8 consisting of a V-shaped ring groove or a dish-shaped recess into which the tip of the bolt 7 engages, thereby strengthening the integration of the joint steel material 5 and the bolt 7. It is desirable that the PC boards 1, 1 be attracted to each other as the bolts 7 are tightened.

Note that after the bolts 7 are fastened, the counterbore holes 2 are filled with mortar 9 or the like. Furthermore, if necessary, a filler such as mortar may be filled in the joint sleeve 4 in advance to prevent corrosion.

``Effects of the invention'' As described above, according to this invention, a vertical insert that opens into a counterbore hole provided on the surface of a PC board;
A steel joint sleeve that communicates with this insert and is fixed at right angles and has one end opened at the joint end surface of the PC board is embedded in the PC board, and the joint sleeve has the openings of the joined PC boards aligned with each other. The joint steel rods are inserted in series, and the bolts screwed into each insert are clamped onto the joint steel rods, so the PC board reliably maintains its resistance not only to the shearing force generated on the PC board, but also to bending and tensile forces. It follows the deformation and rope elongation of
It is possible to ensure the safety of joints in tunnel lining using PC boards.

In addition, it can be fixed by inserting a joint steel rod and tightening the bolts vertically from the inner surface of the lining, making the work easier. After tightening, the bolts are embedded in the mortar filled in the counterbore holes, making them more decorative. will not be damaged either.

Furthermore, since the strong elastic reaction force of the sealant can be reliably absorbed when the sealant is compressed, it is possible to sufficiently maintain the water-tightness of the joint and the assembly accuracy. Since the insert is used as the mounting hole for the erector, there is no need to provide a separate mounting hole for the erector, and the joint structure is simple and rational to manufacture.

[Brief explanation of drawings]

Fig. 1 is a longitudinal side view showing a joint structure according to this invention, Fig. 2 is a perspective view of a joint steel bar with a circular cross section used in this invention, and Fig. 3 is a longitudinal side view of a joint steel bar with a rectangular cross section. Figure 4 is a longitudinal side view showing the PC lining structure of a tunnel constructed using the joint structure of this invention. 1... PC board, 2... Counterbore hole, 3... Insert, 4... Fitting sleeve, 5... Fitting steel bar,
6, 6'... Sealing material, 7... Bolt, 9...
…mortar.

Claims (1)

[Scope of utility model registration request] A vertical insert that opens into a counterbore hole provided on the surface of the PC board, and a steel joint sleeve that communicates with this insert and is fixed at right angles, with one end opening at the joint end surface of the PC board, are inserted into the PC board. buried in
A tunnel cover characterized in that a series of joint steel rods are inserted into the joint sleeves of the joined PC plates whose openings coincide with each other, and bolts screwed into each of the inserts are pressed onto the joint steel rods. engineering
Joint structure of PC board.