JPH0791881B2 - Sheath joint for stuffed concrete - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a precast concrete girder spanning in parallel and a space between concrete girders and concrete pavement boards, etc. The present invention relates to a sheath joint for filling concrete for connecting a sheath for inserting PC steel with a concrete portion to each other.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, when an in-situ stuffed concrete 1B is installed between existing concrete portions 1A, 1A such as precast concrete members, these are integrated into a prestressed concrete (hereinafter referred to as PC). In order to do so, the spiral sheath 2B for interstitial concrete is embedded continuously with the spiral sheaths 2A, 2A for inserting the PC steel material in the existing concrete portions 1A, 1A. At that time, the joint sheath 3 as shown in FIG. 5 is used. Each of these sheaths 2A, 2A and 3 is a so-called spiral winding tube in which a strip steel is spirally wound to form a tubular shape, and a seam and a convex-concave line are spirally arranged on the outer surface of the tubular shape. Has been done. The joint sheath 3 straddles both ends of the sheaths 2A, 2A to be connected to each other, and is screwed into the joints to connect the two sheaths 2A, 2A. When connecting the sheaths, the spiral sheath 2B for stuffed concrete is set at a predetermined position between the existing concrete parts 1A and 1A while the joint sheath 3 is deeply screwed onto either side of the two sheaths 2A and 2A. Then, the joint sheath 3 is swung to be screwed to the other sheath side, and the sheath 2B is swung to an angle at which the spirals coincide with each other, and the tip of the joint sheath 3 is screwed into the joint sheath 3 for connection.

[0003]

In such a conventional joint method, the sheath 2B must be rotated in order to screw in the joint sheath 3, and therefore, when the sheath 2B is long, There is a problem that the work is troublesome and the work is inefficient. Further, although taping is performed as a water-stop treatment for the joint, the existing concrete portion 1A has only the end portion of the sheath 2A opened on the surface thereof, so taping between the sheath 2A and the joint sheath 3 is performed. It is impossible and there is a problem that the water stopping process is troublesome.

In view of the above-mentioned conventional problems, the present invention provides a sheath joint for filling concrete, in which the work of connecting the sheaths can be easily performed with a small amount of work, and the waterproofing treatment can be easily performed. It is intended for.

[0005]

SUMMARY OF THE INVENTION In order to solve the conventional problems as described above and achieve the intended purpose, the gist of the present invention is that the end of the spiral sheath is screwed into one end. The sheath outer fitting spiral tubular portion is inserted into the spiral sheath at the other end, and the outer sheath smooth insertion tubular portion is inserted into the spiral sheath, and the sheath inner insertion smooth tubular portion is provided on the proximal end side. In addition to integrally including flange-shaped step portions,
An annular elastic packing having an adhesive layer on the surface is fitted outside the smooth tubular portion for insertion into the sheath by contacting the stepped portion, and in the outside tubular sheath for external fitting, between the existing concrete members. While screwing the end portion of the spiral sheath for the filling concrete portion that is continuously placed in, the smooth tubular portion for inserting into the sheath is inserted into the sheath opened on the surface of the existing concrete member, The present invention resides in a sheath joint for inserting PC steel material for interstitial concrete, in which an elastic packing is sandwiched between the step portion and the surface of an existing concrete member.

[0006]

In the sheath joint for stuffed concrete of the present invention, the spiral-fitting tubular portion for fitting the sheath outside of the sheath joint is screwed onto the end of the spiral sheath for stuffed concrete, and the sheath is installed at a predetermined position. Then, the tip of the smooth cylindrical portion for inserting into the sheath of the sheath joint is made to face the sheath opening of the existing concrete member. In this state, the sheath joint is rotated and screwed, and the smooth tubular portion for inserting into the sheath at the tip is inserted into the sheath of the existing concrete member. By further advancing, the elastic packing material comes into contact with the existing concrete surface, and the elastic packing material is caught between the flange-shaped step portion and the existing concrete surface due to the reaction force to the spiral sheath for stuffed concrete and stopped. Water is made.

[0007]

EXAMPLE An example of the present invention will be described with reference to FIGS.

In the figure, 10 is a sheath joint according to the present invention. The sheath joint 10 is composed of a joint body 11 formed by pressing a steel material into a cylindrical shape, and an elastic packing material 12 fitted into the joint body 11.

The joint body 11 has a cylindrical portion 11a with a spiral.
Further, a smooth tubular portion 11b having a smaller diameter than this and a flange-shaped step portion 11c between the tubular portions are integrally formed. The cylindrical portion with a spiral 11a is formed in such a size that the spiral sheath 2B for the stuffed concrete portion fits inside the spiral tubular portion 11a, and the spiral groove 14 with which the spiral ridge 13 outside the sheath 2B fits on the inner surface thereof.
Is molded. The smooth tubular portion 11b is fitted into the spiral sheath 2A embedded in the existing concrete member 1A, and is formed into a cylindrical shape with a smooth outer surface so that the spiral sheath 2A can freely rotate inside. Further, the stepped portion 11c is a portion connecting both tubular portions having different diameters to each other, and is a base end portion of the smooth tubular portion 11b and has a flange-like shape on the outer peripheral side.

The elastic packing material 12 is made of a donut-shaped sponge-like elastic material.
Adhesive layer 1 consisting of double-sided tape on the tip side of the smooth tubular portion 2
5 is attached.

A sheath joint 1 constructed in this way
When using 0, as shown in FIG. 3 (A), the sheath joint 10 is deeply fitted to the outside of the spiral sheath 2B for the stuffed concrete part, and this is piped at a predetermined position to replace the existing concrete member 1A. It is opposed to the opening of the spiral sheath 2A.

After that, as shown in FIG. 3 (B), the sheath joint 10 is rotated with respect to the spiral sheath 2B and moved to the opposite spiral sheath 2A side, and the smooth cylindrical portion 11b is inserted into the sheath 2A. To do. Further, by moving the sheath joint 10 to the sheath 2A side, the elastic packing material 12 is sandwiched between the stepped portion 11c and the surface of the existing concrete member 1A, and the adhesive layer 15 is pressed and attached to the concrete surface. Then, the seam between the sheath joint 10 and the sheath 2A is stopped. Also sheath 2B
The taping 16 is provided at the joint between the sheath joint 10 and the sheath joint 10 to stop water.

[0013]

As described above, in the sheath joint of the present invention, a smooth tubular portion having a smooth surface to be inserted into the sheath in the existing concrete member is provided on one end side, and the stuffed concrete portion is provided on the other end side. By providing the spiral-fitting tubular part outside the sheath, the smooth tubular part is inserted into the sheath of the existing concrete member simply by screwing the sheath joint with respect to the stuffed concrete part sheath. As a result, it is not necessary to rotate the entire sheath for the stuffed concrete part to match the spiral angle as in the conventional case, and workability is significantly improved. Moreover, the elastic packing material and the existing part are used. With the structure that sandwiches it between the side and the side, it is possible to automatically and automatically stop water at the joint with the sheath of the existing concrete member, which could not be done conventionally. In which it became a Rukoto.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of an inter-sheath connection structure using a sheath joint of the present invention.

FIG. 2 is an enlarged cross-sectional view of the same sheath joint.

3A and 3B are cross-sectional views showing a sheath connecting step, respectively.

FIG. 4 is a cross-sectional view showing a state in which a conventional stuffed concrete portion is embedded in a sheath.

FIG. 5 is an enlarged cross-sectional view of a connecting portion of the above sheath.

[Explanation of symbols]

 1A Existing concrete member 1B Filled concrete part 2A, 2B Spiral sheath 10 Sheath joint 11 Joint body 11a Spiral cylinder part 11b Smooth cylinder part 11c Flange step part 12 Elastic packing material 13 Spiral ridge 14 Spiral groove 15 Adhesive Layer 16 Taping

Claims (1)

[Claims] 1. A smooth cylinder for sheath outer insertion, in which an end of a spiral sheath is screwed into one end, and a sheath outer insertion surface, into which the spiral sheath is inserted, is inserted into the spiral sheath at the other end. And a flange-shaped step portion integrally provided on the proximal end side of the smooth tubular portion for insertion into the sheath, and abutted against the stepped portion to the surface outside the smooth tubular portion for insertion into the sheath. An annular elastic packing having an adhesive layer is fitted, and an end portion of a spiral sheath for a packed concrete portion that is continuously cast between existing concrete members is provided in the sheath outer fitting spiral cylinder portion. While being screwed, the smooth tubular portion for insertion into the sheath is inserted into the sheath opened on the surface of the existing concrete member, and the elastic packing is sandwiched between the step portion and the surface of the existing concrete member. Sheath joint for insertion of PC steel material for filling concrete.