JPH0634014U - Coupling sheath for block joint in precast block method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a coupling sheath for interposing a PC steel material insertion hole at a joint in a precast block method in which precast blocks are connected by tension of PC steel material and sequentially extended. [Structure] Approximately half of the entire length is used as a cylindrical portion with a spiral convex strip 11 having a spiral convex strip 13 protruding to the outer surface, and the remaining approximately half is formed as a tapered tapered cylindrical portion 12 having a spiral convex strip. Attach the cylindrical part 11 to the P of the precast block B2 on the new side.
The C steel material insertion hole 14 is screwed in, the two blocks B1 and B2 are joined in a state where the tapered cylindrical portion 12 is projected, and the tapered cylindrical portion 12 is inserted into the PC steel material insertion hole 14 of the precast block B1 on the existing side.

Description

[Detailed description of the device]

[0001]

[Industrial Ueno field]

 The present invention relates to a coupling sheath used in a joint of PC steel material insertion holes between blocks in a precast block construction method in which a precast block is joined and tensioned with PC steel material to integrate the precast block while extending the bridge. .

[0002]

[Prior art]

 In general, the precast block method is constructed as shown in Fig. 4, in which the PC steel material 2 inserted through the concrete precast blocks 1 and 1 is inserted into the blocks, and the ends are supported by both blocks to make them tense, whereby the blocks 1 and 1 are tensioned. They are integrated and gradually extended to build bridges.

In this precast block construction method, conventionally, as shown in FIG. 5, the PC steel material insertion holes 3 are opened in the joint surfaces of both blocks 1, 1 so that they are communicated with each other at the time of joining, and an adhesive agent is applied to the joint surfaces. After applying 4, the two blocks 1 and 1 are joined together, and then the PC steel material 2 is inserted through both PC steel material insertion holes 3 and 3 which are communicated with each other. In addition to the steel rod, the PC steel material 2 uses a strand formed by twisting a plurality of wire rods.

In addition, since the PC steel material insertion hole 3 needs to be filled with grout after the PC steel material 2 is tensioned and the PC steel material 2 and the concrete block 1 are integrated with each other, a spiral uneven strip is formed on the inner and outer surfaces. A so-called spiral wound tube sheath is used.

[0005]

[Problems to be solved by the device]

 Conventionally, for coupling PC steel material through-holes using a spiral wound tube, a coupling sheath made of a spiral wound tube having a smaller diameter than this has been used, but this is used for both PC steel material through-holes to be connected. It cannot be used when joining precast blocks as described above because they must be screwed together. For this reason, in the conventional precast block method, the adhesive applied to the joint surface of the precast block method protrudes from the joint of the PC steel material insertion hole to the inside and narrows the hole, or in some cases blocks it. There was a problem of being lost. In addition, when the grout was injected after tensioning the PC steel material, there was a problem that the grout leaked out from the gap of the seam and the grout could not be filled sufficiently.

In view of such conventional problems, the present invention aims to provide a coupling sheath capable of completely connecting the joints of the PC steel material insertion holes between the precast blocks to be joined to each other in the precast block method. It is what

[0007]

[Means for Solving the Problems]

 The features of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are: a cylindrical portion with a spiral ridge having a cylindrical shape and one end of which is integrally provided with a spiral ridge on the outer circumference. PC with a spiral sheath in which the other end side is a tapered taper tubular portion continuous with the tubular portion with the spiral ridge, and the tubular portion with the spiral ridge is integrally formed with spiral irregularities on the inner and outer surfaces. A pair of precast blocks provided with steel material through holes so as to communicate with each other. Screw into the PC steel material through hole on one side of the precast block so that the tapered cylinder portion is inserted into the PC steel material through hole on the other side of the pair of precast blocks. It exists in the coupling sheath for the block seam in the precast block method.

[0008]

[Action]

 When the coupling sheath according to the present invention is used, the tubular portion with the spiral ridge is screwed into the end portion of the PC steel material insertion hole on one side of the precast block to be joined, and the taper tubular portion is projected to the block joining end surface. Keep it. In this state, the precast blocks are joined to each other, and the tapered cylindrical portion is inserted into the PC steel material insertion hole of the mating block. At this time, the tapered cylindrical portion is tapered, so that it can be inserted smoothly. In addition, since the adhesive is applied to the joint surface of the block, the adhesive protrudes to the outer peripheral side of the coupling sheath at the time of joining, and this causes a small gap between the outer surface of the coupling sheath and the inner surface of the PC steel material insertion holes of both blocks. Will be filled and the seam will be sealed.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to FIGS. In the figure, A is a coupling sheath according to the present invention. The coupling case A is integrally formed of a steel cylinder, and approximately half of the entire length is a cylindrical portion 11 with a spiral ridge, and the other half is a tapered cylindrical portion 12.

The cylindrical portion 11 with a spiral ridge is integrally formed with a straight cylinder-shaped cylinder body 11 a and a spiral ridge 13 which is bulged from the inner surface side to the outer surface side. The diameter of this cylindrical body, the cross-sectional shape of the spiral ridge 13 and the spiral pitch are matched with the spiral wound tube sheath 15 constituting the PC steel material insertion hole 14 of the precast blocks B1 and B2 using this, and the inner surface thereof is It is shaped to fit well.

The tapered cylindrical portion 12 has a maximum outer diameter of the cylindrical main body 11a of the cylindrical portion 11 with a spiral projection, and is formed in a taper shape in which the tip side is tapered.

When using the coupling sheath constructed as described above, as shown in FIG. 1A, the PC steel material insertion hole 14 of the new-side precast block B2 to be joined to the precast block B1 on the existing side is to be joined. The tubular portion 11 with the spiral ridge is screwed in, and the tapered tubular portion 12 is attached in a protruding state.

Next, after adhesive 16 is applied to the joint surface of either of the blocks B1 and B2, both the blocks B1 and B2 are joined as shown in FIG. The precast block B1 is inserted into the PC steel material insertion hole 14. As a result, the coupling sheath A is installed so as to straddle the PC steel material insertion holes 14 and 14 of the blocks B1 and B2, which are joined to each other.

Then, as shown in FIG. 1C, the PC steel material C is inserted, and by tensioning the PC steel material C, the blocks B1 and B2 are pressed against each other, whereby the adhesive protrudes and both PC steel materials C It is press-fitted into the inside from the joint between the insertion holes 14 and 14, and this closes the gap between the outer surface of the coupling sheath A and the inner surfaces of the PC steel material insertion holes 14 and 14.

[0015]

[Effect of device]

 As described above, the coupling sheath of the present invention does not rotate in the tubular portion with the spiral ridge screwed into the PC steel material insertion hole of the one precast block and in the PC steel material insertion hole of the other precast block. Since it is equipped with a taper part that can be inserted with, it can be inserted in the joint of the PC steel material insertion hole when joining both precast blocks while attached to one precast block, and when joining both blocks. The adhesive protruding from the seam does not penetrate into the PC steel insertion hole, the hole is not clogged up, and the gap of the seam is filled well, the leak of the grout is also prevented, and the filling state of the grout is more complete. Is obtained.

[Brief description of drawings]

1A to 1C are sectional views showing a joining process using the coupling sheath of the present invention.

FIG. 2 is a side view of a coupling sheath according to the present invention.

FIG. 3 is a front view of the above.

FIG. 4 is a side view showing an outline of a conventional precast block method.

FIG. 5 is a partially enlarged cross-sectional view of the above joint portion.

[Explanation of symbols]

 A Coupling sheath B1, B2 Precast block C PC steel 11 Cylinder with spiral ridge 11a Cylinder body 12 Tapered 13 Spiral ridge 14 PC steel insertion hole 15 Spiral wound tube sheath 16 Adhesive

Claims (1)

[Scope of utility model registration request] 1. A tapered taper having a cylindrical shape with one end side integrally provided with a spiral ridge on the outer periphery and having the other end side continuous with said cylindrical section with a spiral ridge. A cylindrical portion with a spiral ridge, which is not a cylindrical portion, is provided with PC steel material insertion holes formed by a spiral sheath integrally formed with spiral irregularities on the inner and outer surfaces so as to communicate with each other. A coupling sheath for a block seam portion in a precast block construction method, which is adapted to be screwed into a hole so that the tapered cylindrical portion is inserted into a PC steel material insertion hole on the other side of the pair of precast blocks.