JPH0259260B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joint water sealing method for liquid-tightly joining concrete structures such as split boxes constituting an assembled underground water storage tank.

In the case of a prefabricated underground water storage tank, etc., from the viewpoint of its structure and use, it is a matter of course that reliable water-stopping measures are required for the joints between the respective members.

As a conventional water-stopping measure, as shown in FIG.
There is a method of attaching a gasket 23 made of synthetic rubber or the like to the joint end surface 1d of the divided box 1 made of c to stop water, but this method of simply using the gasket has the following problems. In other words, since the divided box 1 is made of concrete, the joint end surface 1d is also a rough surface with uneven surfaces, which makes it difficult for the packing to fit in, and for this reason, the packing cannot reliably exert its water-stopping effect. There is a physical problem.

Therefore, as a solution to this problem, the packings 2 and 3 are used as inner and outer back-up materials, respectively, and as shown in FIG.
Rubber ring-shaped packings 5 surrounding the tendon insertion holes 4 opened at the joint end surface 1d are attached to form back-up materials, and the tendons 6
After joining the divided boxes 1 with
As shown in FIG. 3, a method of injecting and filling a resin material 7 that hardens at room temperature (epoxy resin, urethane resin, etc.) between d and 1d to stop water is carried out as needed.

However, in this method of pressure-welding the divided boxes with each other using tendons and injecting and filling the resin material between the joint end surfaces, there are particular issues regarding the treatment of the tendon insertion holes 4 opened in the joint end surfaces. There are still issues to be resolved. That is, a rubber ring-shaped packing 5 surrounding the tendon insertion hole 4
As mentioned above, since the resin material 7 has poor affinity with concrete, the ring-shaped packing 5
If there is a problem that the grout material flows into the tendon insertion hole 4 through the tendon material, and if it is necessary to inject and fill the tendon material insertion hole 4 after introducing the tension force of the tendon material 6, the grout material should be injected instead. There were problems such as grout leaking between the joint end faces. Moreover, after the ring-shaped packing 5 is bonded, its bonded end surface 1d,
Since it is in a form that completely fits between 1d, there is a problem in that it cannot be repaired either from the inside or the outside.

The present invention has been made in consideration of the above points, and it is possible to make the back-up material for protecting the tendon insertion hole, which is difficult to repair after joining, to have a reliable and strong structure from the beginning, thereby making it possible to make it waterproof. Not only can the resin material be filled only in the necessary areas between the jointed end faces, but also the grout material will not leak between the jointed end faces even if grout is filled into the tendon insertion holes as necessary. The purpose of the present invention is to provide a method for waterproofing joints between concrete structures that is free from water leakage and has good workability on site.

Hereinafter, the present invention will be explained based on an embodiment shown in the attached FIGS. 4 to 6.

The water stop method according to the present invention is also basically applied between the opposing joint end surfaces 1d and 1d of the split boxes 1 to be joined to each other, so that the viscous A construction method is adopted in which an inner circumferential back-up material 10 and an outer circumferential back-up material 11 are provided, which are made by caulking a resin material with a high viscosity, and then an ordinary room-temperature curing resin material 7 with low viscosity is injected and filled to stop water. be done.

However, in the present invention, when joining the divided boxes 1, which is a step before injecting and filling the resin material 7, between the joint end surfaces 1d, 1d of the divided boxes 1, A communication pipe 12a that fits into the open tendon insertion holes 4, 4 facing each other and communicates the two insertion holes, and this communication pipe 1.
After inserting the back-up spring 12 having a flange plate 12c provided on the outer periphery of the housing 2a and held by the joint end faces 1d, 1d, the divided boxes 1 are integrated with the tension material 6, and thereby the tension material The feature is that a back-up material is formed to protect the insertion hole.

Here, to explain in detail the structure and material of the backup spring 12, the communication pipe 12a is
In the illustrated example, it is made of a material such as a metal pipe, a synthetic resin pipe, or a hard synthetic rubber, and has approximately the same inner and outer diameter as the seal pipe 4b forming the tendon insertion hole 4, and its length is the same as that of the divided box to be joined. The two ends are dimensioned so that they fit tightly into the tendon insertion holes 4, 4 of No. 1, 1, respectively. Further, the flange plate 12b is connected to the connecting pipe 12.
It is externally fitted into the central part in the length direction of a through the through hole 12c, and is formed to have a sufficiently larger diameter and thicker wall than the tendon insertion hole 4, and is made of a liquid-tight material such as synthetic rubber as a whole. It is made of elastic material. Note that the sheath tube 1 forming the tendon insertion hole 4
3 is removed by the necessary length l in order to eliminate interference with the communication pipe 12a, but generally the inner diameter of the tendon insertion hole 4 is large enough to provide sufficient margin for the tendon 6. Since this is common, the connecting tube 12a may be directly fitted into the tendon insertion hole 4, that is, into the sheath tube 13.

In the present invention, the connecting pipe 12a is used as a means for forming a backup material for protecting the tendon insertion hole.
After setting the back-up spring 12 having the flange plates 12b and 12b, the split boxes 1 are formed by pressure welding. 12b tightly adheres not only to the joining end surfaces 1d and 1d but also to the connecting pipe 12a. That is, when the flange plate 12b is sandwiched between the joint end surfaces 1d and 1d and elastically deforms into a flat shape, it not only deforms outward so that its outer diameter becomes larger, but also inwardly, that is, the inner diameter of the through hole 12c becomes smaller. As a result, the liquid tightness between the flange plate 12b and the communication pipe 12a is ensured. In addition, both ends of the communication pipe 12a are tightly fitted into the tendon insertion holes 4, 4 to communicate with each other, and are inserted to a certain depth, so that these things can be avoided. The backup spring 12 exhibits a sufficient liquid-tight effect and strength necessary as a backup material for protecting the tendon insertion hole. Therefore, the resin material 7 that is injected and filled over the entire area between the joining end surfaces 1d and 1d does not flow into the tendon insertion hole 4, and can be filled as needed, depending on the type of tendon used. Therefore, the grout material filled in the tendon insertion hole 4 will not flow out from the insertion hole 4 between the joint end surfaces 1d, 1d. Furthermore, regarding the work of forming the back-up material, the back-up springs 12 are produced in advance at a factory or the like, and it is only necessary to simply set them at the site, so that workability at the site is also good.

As described in detail above, according to the present invention, the back-up material for protecting the tendon insertion holes, which is difficult to repair after joining, can be made to have a reliable and strong structure from the beginning, and thereby the resin material for waterproofing can be joined. Not only can it reliably fill only the necessary parts of the end face, but
Even when the tendon insertion hole is filled with grout as necessary, the grout does not leak between the joint end faces, and the workability at the site is also good.

[Brief explanation of drawings]

Figures 1 to 3 show a conventional example; Figure 1 is a perspective view, Figure 2 is a front view, Figure 3 is a sectional view, and Figures 4 to 6 are an embodiment of the present invention. It shows
FIG. 4 is a partially enlarged front view, FIG. 5 is a sectional view showing a joined state, and FIG. 6 is a perspective view of the back-up spring. 1...Divided box, 4...Tension material insertion hole, 6...
Tensile material, 7...Resin material, 10...Inner circumferential side back-up material, 11...Outer circumferential side back-up material, 12
...Backup spring, 12a...Connection pipe, 1
2b...flange plate.

Claims (1)

[Claims] 1 A plurality of divided boxes are integrated with one or more tension members penetrating each of the divided boxes, and a back-up material is provided between the opposing joint end surfaces of the divided boxes, and then a room-temperature curing type is formed. In the joint water stop construction method in which water is stopped by injecting and filling a resin material, connecting pipes are provided between the joint end faces of the split box and fit into mutually opposing tendon insertion holes opened in the joint end faces; After inserting a back-up spring having a flange plate provided on the outer periphery of the communication pipe and made of an elastic material having a larger diameter than the tension material insertion hole, the divided boxes are integrated with the tension material. This is a water-stopping method for joints between concrete structures.