JPH0249991B2 - - 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 to stop water by attaching gaskets 2 and 3 made of synthetic rubber or the like to the joint end surface 1d of the divided box 1 made of c, but this method of simply using gaskets 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.
After attaching ring-shaped packings 5 surrounding the tendon insertion holes 4 opened at the joint end surface 1d, and joining the divided boxes 1 with the tendons 6 or other fastening fittings, 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 the joint end surfaces 1d and 1d to stop water is carried out as needed.

However, with this resin injection method,
It is necessary to use a resin with low viscosity so that it can be injected at low pressure, but if such a low viscosity resin is used, the back-up material 2, which is a packing material that does not fit well with concrete, as mentioned above, There was a problem that the tendon material leaked out through the tension material insertion hole 3 and further passed through the ring-shaped packing 5 surrounding the tendon material insertion hole 4 and flowed into the tendon material insertion hole 4. In particular, since the ring-shaped packing 5 and the like fit completely between the bonded end surfaces 1d and 1d after bonding, 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-mentioned points, and has a structure in which one of the opposing joint end surfaces of the divided box is curved so as to surround the tendon insertion hole opened in the joint end surface, and is self-contained. A construction method in which a packing material having grooves on the surface of the packing material is attached via a resin material, and after filling the grooves of the packing material with a resin material that hardens at room temperature, the divided boxes are integrated with each other using tension material. By adopting this method, it is possible to form the back-up material part, which is difficult to repair after joining, into a reliable and strong structure from the beginning.This allows the low-viscosity resin material to be filled in the subsequent process to be filled only in the necessary parts between the joint end faces. The purpose of the present invention is to provide a water-stopping construction method for joints between concrete structures that can be filled with water to further improve the water-stopping properties of the joints, and also has good workability on site.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

The water stop method according to the present invention also basically consists of an inner periphery that goes around the inner circumferential side and the outer circumferential side of the split box 1, respectively, between the opposing joining end surfaces 1d and 1d of the split boxes 1 to be joined to each other. After providing the side back-up material 10 and the outer circumferential back-up material 11, a construction method is adopted in which water is stopped by injecting and filling a normal room-temperature curing resin material 7 with low viscosity.

However, in the present invention, before injecting and filling the resin material 7, a tension material insertion hole protecting back-up material 20 having a structure as shown in the figure is formed.
In addition, if necessary, the outer circumferential bottom backup material 11
It is characterized by forming a.

First, regarding the outer circumferential bottom back-up material 11a, before joining the divided boxes 1 to each other, one of the joining end faces is made to mutually extend along the bottom plate portion 1a as shown in FIGS. 4 and 5. Two gaskets 12, 12 extending in parallel with an interval are attached, and after bonding, a room temperature curing resin material 13 having a higher viscosity than the resin material 7 is inserted between these gaskets as shown in FIG. Split box 1
The material is injected and filled from the outer side of the side plate and is cured to form the outer peripheral bottom back-up material 11a having a sufficient thickness as a whole.

Here, the two gaskets 12, 12 may be attached directly to the joint end surface 1d, but as shown in FIG. A structure in which the gaskets 12, 12 are fixed more securely and a sufficient space for filling the resin material 13 is formed is advantageous in that the gaskets 12, 12 can be fixed more securely and a sufficient space can be formed to fill the resin material 13.

Next, the back-up material 20 for protecting the tension material insertion hole, which is the gist of the present invention, will be described.

In order to form this back-up material 20, first, the joint end surfaces 1d, 1 of the split boxes 1 facing each other are
A packing material 22 which is curved to surround the tendon insertion hole 4 opened in the joint end surface 1d and has a concave groove 21 on its surface in advance, that is, before joining the divided boxes 1 to one another, d. is attached via a resin material 23, and a resin material 24 that hardens at room temperature and has high viscosity is attached to the groove 21 of this packing material 22.
After filling the boxes to a sufficient extent as shown in FIG. 8, the divided boxes 1 are integrated with tension members 6 as shown in FIG. 9, thereby protecting the tension material insertion holes. A backup material 20 is formed. Here, the illustrated packing material 22 is curved in a U-shape as a whole, and both ends thereof face near the outer surface of the divided box 1, and the concave grooves 21 of the packing material 22 are , is similarly formed in a U-shape at the center portion of the packing material 22 in the width direction along the longitudinal direction of the packing material 22.
The packing material 22 also has a tapered surface 2 formed by edging the corner portion formed by the surface in contact with the joint end surface 1d and the outer peripheral surface of the packing material 22 as shown in FIG.
2a is formed, and the resin material 23 is applied so as to fill the gap formed between the tapered surface 22a and the joint end surface 1d. The packing material 22 may be made of any material having appropriate elasticity and liquid tightness, such as resin or synthetic rubber. Note that the remaining outer circumferential side backup material 1 excluding the outer circumferential bottom backup material 11a portion
0 and the inner circumferential side backup material 10 are preferably formed by so-called caulking using a highly viscous resin material.

In the embodiment, as a means for forming the back-up material 20 for protecting the tendon insertion hole, a packing material 22 that is curved so as to surround the tendon insertion hole 4 and has a groove 21 on its surface is used, and a resin material 23 is used. The resin material 2 is attached to the concave groove 21 through the groove 21.
4 and then the divided boxes 1 are integrally formed with tension material, so that the liquid-tight effect is extremely high and the strength is also good. That is, when the divided boxes 1 are integrated with the tension material 6, the packing material 22 is subjected to a compression action as shown in FIG. Because it receives the resin material 24
As shown in the figure, it strongly adheres to the other joint end surface 1d to be joined while being crushed flat to some extent. Therefore, this crushed resin material 2
4 adheres closely to the other joining end surface 1d, which is originally a rough surface, so that it forms a reliable liquid-tight structure. Since this resin material 24 can be hardened to an appropriate hardness before being filled with the resin material 7, the back-up material 20 constituted together with the packing material 22 and the resin material 23 has good strength.

Regarding the outer circumferential bottom back-up material 11a, the resin material 13 can be injected and filled between the packings 12 and 12 from the outer surface of the side plates of the divided box 1 in the horizontal direction. Even if the resin material 13 has a high viscosity as in the embodiment, it can be injected and filled with low pressure, and since the resin material 13 has a high viscosity, it cannot be poured from between the packings 12 to the outside. It does not leak, and even if it does leak, it will harden and stop midway through, and a large amount will not leak out. Since the bottom back-up material 11a and the tension material insertion hole protection back-up material 20 having such a structure exhibit a good liquid-tight effect as described above, the joint end surfaces of the divided boxes 1 are sealed in the subsequent process. The resin material 7 injected and filled into the entire space between 1d and 1d will not leak out from anywhere and will be reliably filled only in the necessary part between the joint end faces, and as a result, the water at the joint will be reliably stopped. Become something.

In addition, in the embodiment, the packing material 22 is
Although a letter-shaped example has been shown, a ring-shaped example as shown in FIG. 10 can also provide similar effects as a back-up material for protecting tendon insertion holes.

As explained above, in the present invention, a packing is provided on one of the opposing joint end surfaces of the divided box, which is curved so as to surround the tendon insertion hole opened in the joint end surface, and has a concave groove on its surface. The construction method involves attaching the parts through a resin material, filling the grooves of the packing material with a resin material that hardens at room temperature, and then integrating the divided boxes with tension material, making it easy to repair them after joining. It is possible to form a difficult back-up material part into a reliable and strong structure from the beginning, and this allows the low viscosity resin material to be filled in the subsequent process to be filled only in the necessary areas between the joint end faces, improving the water-tightness of the joint. It has excellent effects, such as improved performance and improved workability on site.

[Brief explanation of drawings]

Figures 1 to 3 show conventional examples, where Figure 1 is a perspective view of an assembled underground water tank, Figure 2 is a front view showing another conventional example of the joint water stop method, and Figure 3 is a perspective view of an assembled underground water tank. 4 to 9 show an embodiment of the present invention, FIG. 4 is a front view of the divided box, and FIG. 5 is a sectional view of the divided box.
6 is a cross-sectional view showing the bonded state, FIG. 7 is a partially enlarged view of FIG. 4, and FIG.
The figure is a sectional view showing a bonded state along the - line in FIG. 7, FIG. 9 is a sectional view showing a bonded state, and FIG. 10 is a partially enlarged view similar to FIG. 7 showing another embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 1...Divided box, 1d...Joining end surface, 6...Tension material, 7...Resin material, 10...Inner circumference side backup material, 11...Outer circumference side backup material, 11a
...Outer circumferential bottom back-up material, 20... Back-up material for protecting tendon insertion hole, 21... Concave groove, 2
2...Packing material, 22a...Tapered surface, 23,
24...Resin material.

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 waterproofing construction method in which water is stopped by injecting and filling a resin material, one of the opposing joint end surfaces of the split box is curved so as to surround a tendon insertion hole opened in the joint end surface. A packing material having grooves on its surface is attached via a resin material, and after filling the grooves of the packing material with a resin material that hardens at room temperature, the divided boxes are integrated with a tension material. A water stop method for joints between concrete structures, which is characterized by: