JPH027996Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a joint structure for concrete structures such as box culverts.

"Prior Art" Conventionally, as shown in FIG. 5, as a structure for joining precast structures 1, joint fittings 3 having bolt holes are buried near the joining end surfaces of each precast structure 1, and these joint fittings are connected. A structure in which 3 are joined together using a joining bolt 4 and a nut 6 is known.

"Problems to be solved by the invention" In the above joint structure, the joint metal fitting 3 is buried along the joint end surface, and the joint bolt 4 passes through this joint metal fitting 3, so that the surrounding area of the joint metal fitting 3 is A recess 5 for operation as shown in FIG. 5 is formed in the precast structure 1 for the purpose of accommodating the joining bolt 4 and the nut 6 and for the purpose of operating a tool for tightening the nut 6. By the way, this recess 5 for operation requires a sufficient size for setting a tightening tool in the nut 6 at the end of the joint bolt 4 and operating the tightening tool.
It was formed much larger than the.

However, forming such a large recess 5 near the joint end surface of the precast structure 1 is difficult.
There is a problem of reducing the margin in terms of strength of the precast structure 1. Further, since the recess 5 opens on the side of the head of the nut 6, facing perpendicularly to the central axis of the nut 6 or the joint bolt 4, the tightening tool must be operated from the side of the joint bolt 4. However, there was a problem that the tightening work became complicated.

The present invention has been developed in view of the above circumstances, and allows the operation hole formed in the concrete structure to operate the tapered member to be smaller than the concave portion of the conventional structure, and also allows the operation hole to be formed in the movement path of the tapered member. The purpose of the present invention is to provide a joint structure in which a joint bolt can be easily operated by forming the joint bolt facing the same direction.

"Means for Solving Problems" The present invention forms storage recesses on both joint end faces of concrete structures to be connected to each other, and provides a connecting member in one storage recess so as to be able to move in and out. A tapered hole is formed at the tip of the member, and a tapered member having a tapered part that can be freely fitted into the tapered hole is provided in the other storage recess so as to be movable in parallel to the joint end surface. An operation hole is formed in the side portion and opens to the surface adjacent to the joint end surface and the storage recess.

"Operation" The connecting member of one concrete structure is pulled out from the storage recess and inserted into the storage recess of the other concrete structure, and the tapered member is inserted into the taper hole of the connecting member using the operation hole. Therefore, the concrete structures can be connected, and the tapered member can be operated and inserted into the tapered hole through the operating hole formed along the moving path of the tapered member, so that the operating hole can be made smaller.

Embodiment FIGS. 1 to 3 show an embodiment of the present invention, in which reference numerals 11 and 12 indicate concrete structures that are used in connection with each other.

A storage recess 13 that opens to the joint end surfaces 11A, 12A is formed in a portion close to each joint end surface 11A, 12A of these concrete structures 11, 12, and a side portion of the storage recess 13 of the concrete structure 11 is formed. , the end surface 11 adjacent to the joint end surface 11A
An operation hole 14 that opens to B and the storage recess 13 is formed in the side portion of the storage recess 13 of the concrete structure 11.
An operation hole 15 is formed which opens into the housing 2B and the storage recess 13. A bottom plate 16 that is in close contact with the bottom surface of the storage recess 13 and side plates 17, 17 that are in close contact with the inner walls of the storage recess 13 are fixed to each storage recess 13.

Further, in the storage recess 13 of the concrete structure 11, a rotating pin 1 passing through the side plates 17, 17 is provided.
8 is provided with its head located within the operation hole 14 and parallel to the joint end surface 11A. A base end portion 20A of a plate-shaped connecting member 20 located between the side plates 17, 17 is welded to this rotating pin 18. This connecting member 20 has a tapered hole 20B formed at its tip, and the rotating pin 18
It is provided so as to be rotatable about the center, and by the rotation, the tip portion can be made to protrude outside the storage recess 13 as shown in FIG.

On the other hand, the end face 12 of the concrete structure 12
As shown in FIG. 1, the side plate 17 on the side closer to B has an insertion hole 21 formed coaxially with the operation hole 15, and the other side plate 17 has an insertion hole 21 formed coaxially with the insertion hole 21. A guide hole 22 having a larger diameter than the insertion hole 21 is formed. And this guide hole 2
A storage section 23 is formed in the concrete structure 12 on the side of No. 2, a cap-shaped interior material 24 is provided on the inner surface of the storage section 23, and a cylindrical tapered member is provided inside the interior material 24. 25 has been inserted.
This tapered member 25 has a screw hole 26 formed in its center, a keyway 27 formed in its outer peripheral surface in parallel to the central axis of the tapered member 25, and a tapered surface that tapers at the tip of the outer surface of the tip. The tapered portion 28 is inserted into the interior material 24 with the tapered portion 28 facing the storage recess 13 side, and is movable along the guide hole 22 in parallel to the joint end surface 12A. There is. Note that the interior material 24 and the side plate 17
The locking key 30 is attached between the taper member 25 and the locking key 30 in the keyway 27 of the taper member 25.
0 is inserted, and the rotation around the axis is prevented, and it is movably installed as described above.

Note that 31 shown in FIG. 1 indicates a sealing material adhered to the joint end surface 12A.

Next, concrete structure 1 having the above-mentioned structure
The joining operations 1 and 12 will be explained.

To join the concrete structures 11 and 12, the connecting member 20 is rotated around the rotating pin 18 and taken out from the storage recess 13 as shown in FIG.
In this state, the concrete structures 11 and 12 are made to face each other, and the tip of the connecting plate 20 is inserted into the storage recess 13 of the concrete structure 12. After this, the screw hole 26 of the tapered member 25 of the concrete structure 12 is
A joining bolt 32 having a diameter that can be screwed into is prepared, and this joining bolt 32 is screwed into the threaded hole 26 of the tapered member 25 through the operation hole 15 and the insertion hole 21. This screwing work involves inserting a tool into the operation hole 15,
This is done by rotating the joining bolt 32.

Note that since the taper member 25 is prevented from rotating in the circumferential direction by the locking key 30, the joining bolt 32 is smoothly screwed into the screw hole 26 by the rotation operation.

By this screwing operation, the tapered member 25 moves toward the tapered hole 20B of the connecting plate 20, and the tapered portion 28 at the tip thereof is inserted into the tapered hole 20B.
Here, even if there is a slight deviation between the central axis position of the tapered hole 20B of the connecting plate 20 and the central axis position of the tapered member 25, the tip of the tapered part 28 in the tapered state is located inside the tapered hole 20B, the tapered portion 28 is picked up and inserted into the tapered hole 20B, so that the positioning of the connecting member 20 with respect to the tapered member 25 is easy. . By this insertion, the tapered surface of the tapered member 25 and the tapered surface of the tapered hole 20B come into contact, and the connecting plate 20 is attached to the concrete structure 1.
2 side, attracts the concrete structure 11 to the concrete structure 12 side, and connects the joint end surface 11.
A and 12A are brought into close contact with each other, and the sealing material 31 is pressed onto the concrete structure 11 to join both concrete structures 11 and 12 as shown in FIG.

In the above-mentioned work, the operation of screwing in the joint bolt 32 is performed by operating a tool inserted into the operation hole 15.
Since the operation hole 15 is formed to include a movement path, the size of the operation hole 15 need only be large enough to allow the head of the joint bolt 32 to be inserted therethrough. Therefore, the operation hole 15
The size of the concave portion 5 for operation can be made smaller than that of the concave portion 5 for operation provided in the conventional structure, which has the effect of improving the margin in terms of strength of the concrete structure 12. Further, in the conventional structure shown in FIG. 4, it was necessary to tighten the nut 6 from the side of the joint bolt 4, but in the above structure, the joint bolt 32 was rotated from the front side of the head of the joint bolt 32. Because it can be operated, the tightening work of the joint bolts 32 is easier than the tightening work in conventional structures.
This has the effect of improving the efficiency of bonding work. In addition, the operation hole 1 formed in the concrete structure 11
4 is also formed along the axial direction of the rotating pin 18, and can be formed smaller than the recess 5 provided in the conventional structure, so that the margin in terms of strength of the concrete structure 11 can be added to the conventional structure. can be compared and improved.

FIG. 4 shows another state in which the concrete structures 11 and 12 are connected by the connecting member 20.
In the bonded state, the connecting member 20 is inclined with respect to the bonded end surface 11A.

If the concrete structures 11 and 12 are joined together using the connecting member 20 in this manner, there is a feature that a pulling force can also be applied in the direction shown by the arrow in the figure along the joining end surface 11A.

Note that if the tapered member 25 is integrated with the joining bolt 32 and the tapered surface of the tapered hole 20B formed in the connecting member 20 is formed in the opposite direction to that in the above embodiment, the joining bolt having the tapered member can be used. It can also be configured such that the joint bolt is inserted into the storage recess 13 through the operation hole 15 and the tapered portion of the joint bolt is directly inserted into the taper hole 20B.

"Effects of the Invention" As explained above, the present invention is capable of pulling out a connecting member that can be freely moved in and out of a storage recess that opens on the joint end face of one concrete structure and inserting it into the storage recess of the other concrete structure. , concrete structures can be connected by inserting the tapered member into the tapered hole of the connecting member, and since the operation hole for moving the tapered member is formed along the moving direction of the tapered member, the taper The tool can be inserted into the operation hole along the moving direction of the member, and the tapered member can be inserted into the taper hole of the connecting member to join both concrete structures, so there is no need to operate the tool from the side of the joint bolt. Compared to conventional structures, which have been difficult to achieve, the joining work is easier and has the effect of improving the efficiency of joining work for concrete structures. In addition, since the operating hole is formed along the direction of movement of the tapered member, the operating hole is smaller than the conventional structure, which required a large recess for tool operation to be formed on the side of the joint bolt. This has the effect of improving the strength margin of concrete structures.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, with Figure 1 being a sectional view showing a pair of concrete structures to be joined, and Figure 2 showing the state of joining of the pair of concrete structures. A sectional view, FIG. 3 is a perspective view showing a state in which the connecting member is protruded from the storage recess, FIG. 4 is a sectional view showing another state of connection by the connecting member, and FIG. 5 is a conventional concrete structure. FIG. 3 is a front view showing a joined state. DESCRIPTION OF SYMBOLS 11, 12... Concrete structure, 13... Storage recess, 14, 15... Operating hole, 20... Connecting member, 2
5...Tapered member, 26...Screw hole, 28...Tapered portion, 32...Joining bolt.

Claims (1)

[Scope of utility model registration request] A storage recess is formed in each of both joint end surfaces of the concrete structures to be connected to each other, a connecting member is stored in one of the storage recesses so as to be freely removable, and a tapered hole is formed at the tip of the connecting member. , a tapered member having a tapered portion that can be fitted into the tapered hole is provided in the other storage recess so as to be movable within the storage recess parallel to the joint end surface, and on the side of the other storage recess, A joint structure for a concrete structure, characterized in that an operation hole is formed that opens in a surface adjacent to the joint end surface and in the storage recess and faces the movement path of the tapered member along the moving direction of the tapered member. .