JPH0243863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water stop construction method for a joint in a prefabricated underground water storage tank made of concrete.

As this type of underground water storage tank, the one shown in FIG. 1 has already been proposed. This is the bottom plate part 1a,
The joint end faces 1d of the divided box 1 formed into a cylindrical shape by the side plate portions 1b and the top plate portion 1c are joined to each other, and the opening is covered with the end plate 2. 2 are integrally formed by a plurality of prestressing steel members 3 arranged in the axial direction of the divided box 1.

By the way, in the case of such a prefabricated underground water storage tank, 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, there is a method of attaching gaskets 4 and 5 made of synthetic rubber or the like to the joint end surface 1d of the divided box 1, as shown in Fig. 1, to stop water. In the method using , it is necessary to attach the packings 4 and 5 to the entire joint end surface 1d of the divided boxes 1 before joining them together, so it is not necessary to join the divided boxes 1 together on site. Patsukin 4,
5 may be partially or entirely displaced or damaged, and the water-stopping effect may be impaired. Moreover, since the divided box 1 is made of concrete, the joint end surface 1d is also uneven, so-called a rough surface, which makes the packing difficult to fit.
For this reason, there is also a physical problem in that the water-stopping effect of the seal cannot be reliably exerted.

Therefore, as a solution to this problem, the packings 4 and 5 are used as inner and outer back-up materials, respectively, and as shown in FIG.
A ring-shaped gasket 7 surrounding the tendon insertion hole 6 opened on the joint end surface 1d is attached to each of the joint end surfaces 1d, 1 after joining.
As shown in FIG. 3, a method of injecting and filling a resin material 8 that hardens at room temperature (epoxy resin, urethane resin, etc.) between the holes d to stop water is carried out as needed.

However, in the case of such conventional methods, as the resin injected from the bottom part is injected and filled into the upper part, the pressure becomes extremely high, so it is necessary to inject a resin with low viscosity. In the method of injecting a low-viscosity resin all over the area, once the injected resin passes through the damaged part of the back-up material 5 and leaks out to the outside, it cannot be stopped; If the packing 7 surrounding the hole 6 is damaged when the boxes are joined together, there is a problem in that the resin material may flow into the tendon insertion hole 6.
In particular, this gasket 7 is attached to the joint end surface 1 after joining.
Since the shape completely fits between d and 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, before joining the divided boxes together, one of the joining end surfaces is curved so as to surround the tendon insertion hole opened in the joining end surface. Attach two strips of packing, and leave both ends of these two packings facing the outer surface of the split box, and after joining, room-temperature curing resin material is injected and filled between these packings to form tension material insertion holes. By forming a protective back-up material and then injecting and filling a normal low-viscosity resin material between the joint end faces, the resin material can be reliably injected and filled only in the necessary areas between the joint end faces. The purpose of the present invention is to provide a water-stopping construction method for a joint in an assembled underground water tank, which can further ensure water-stopping properties of the joint.

Hereinafter, the present invention will be explained based on an embodiment shown in the attached FIGS. 4 to 8.

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 8 with low viscosity.

However, in the present invention, before the resin material 8 is injected and filled, a back-up material 20 for protecting the tendon insertion hole made of a packing and a resin material is formed as shown in the figure, and the same can be done as needed. A feature is that an outer bottom back-up material 11a is formed of a packing and a resin material.

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 8 is applied between these gaskets as shown in FIG. Split box 1
The material is injected and filled from the outer surface of the side plate portion, and is cured to form the outer circumferential bottom back-up material 11a that is sufficiently thick as a whole.

Here, the two gaskets 12, 12 may be attached directly to the joint end surface 1d, but as shown in FIG. However, a structure in which the gaskets 12 are installed in the groove 14 is advantageous in terms of more secure fixing of the gaskets 12, 12, and the formation of a sufficient space for filling the resin material 13.

Next, the backup material 20 for protecting the tension material insertion hole, which is the gist of the present invention, will be described.
This back-up material 20 may be formed in parallel with the step of forming the outer peripheral bottom back-up material 11a, or one of them may be formed first and the other after, but in either case, the divided box 1 Before joining them together, in the illustrated example, approximately U is formed on one of the joining end surfaces 1d so as to surround the tendon insertion hole 15 opened in the joining end surface 1d and spaced apart from each other.
Attach two gaskets 16, 16 that are curved in a letter shape, and attach these two gaskets 16, 16.
Both ends of the split box 1 are exposed to the outer surface of the split box 1, and after joining, these gaskets 16, 16 are
In the meantime, as shown in FIG. 8, a cold-setting resin material having a higher viscosity than the resin material 8, for example, a resin material 13' similar to that used to form the bottom backup material 11a, is injected. The material is filled and cured, thereby forming a back-up material 20 for protecting the tendon insertion hole. Incidentally, as shown in FIG. 4, this backup material 20 is naturally
It is formed for each tendon insertion hole 15, respectively.

Here, the two gaskets 16, 16 may be attached one by one as shown in the illustrated example, but in consideration of the workability of the installation and the reliability of the installation state, they are not particularly shown in the illustration. For example, 1
Two pieces of packing 1 are prepared in advance using the thin-walled connection parts described above.
It is preferable to use a structure in which 6 and 16 are integrated. Note that the remaining outer circumferential side backup material 11 and inner circumferential side backup material 1 excluding the outer circumferential bottom backup material 11a portion are
0 is preferably formed by so-called caulking using a highly viscous resin material after providing the outer peripheral bottom back-up material 11a and the back-up material 20 for protecting the tendon insertion hole. Alternatively, it may be formed using a rubber gasket or the like.

In the present invention, the back-up material 20 for protecting the tendon insertion hole is formed by the two gaskets 16, 16 and the resin material 13' injected between them, so that it can be used as a back-up material. The liquid-tight effect is extremely high and the strength is also good.

Also, a resin material 13' is inserted between the packings 16 and 16.
The filling operation can also be performed in the lateral direction from the outer surface of the side plates of the divided box 1, so even if the resin material 13' is highly viscous as in the embodiment, it can be filled with low pressure. Therefore, it can be injected and filled. Moreover, since this resin material 13' has high viscosity, it will not leak from between the packings 16, and even if it does leak, it will harden and stop midway through, and a large amount will leak out from the tension material insertion hole 1.
There is no possibility that it will flow into 5. In addition, the above-mentioned effects are achieved by the outer peripheral side bottom backup material 11.
The same applies to a.

The back-up material 20 for protecting the tendon insertion hole and the outer peripheral bottom back-up material 11a having such a structure exhibit extremely high liquid-tightness as described above, so that the divided box 1 is The resin material 8 that is injected and filled between the joint end surfaces 1d and 1d is reliably filled between the joint end surfaces without leaking anywhere, and as a result, the water stop of the joint is ensured. becomes.

In addition, in the example, an example was shown in which a resin material 13, 13' filled between the respective packings had a higher viscosity than the resin material 8 filled between the joint end faces 1d, 1d. can be filled with the resin material at low pressure, and after it has hardened, the resin material 8 can be filled between the joint end surfaces 1d and 1d. It is also possible to use 1 or less.

As explained above, the present invention integrates divided boxes having at least a bottom plate portion, both side plate portions, and a top plate portion with one or more tension members passing through the divided boxes, and To stop water at the joint in an assembled underground water storage tank, where an inner back-up material and an outer back-up material are provided between the opposing joint end surfaces, and then a room temperature curing resin material is injected and filled to stop water. In the construction method, before joining the divided boxes together, two pieces of packing are attached to one of the joint end faces, which are curved so as to surround tendon insertion holes opened in the joint end face, and these two pieces of packing are attached to one of the joint end faces. Both ends were made to face the outer surface of the split box, and after joining, a resin material was injected and filled between these packings to form a back-up material for protecting the tendon insertion holes. It is possible to form a difficult-to-repair part into a reliable and strong structure from the beginning, which allows the resin material to be filled in the subsequent process only to the necessary part between the joint end faces, and the joint part It has excellent effects such as more reliable water-stopping properties and relatively good 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 8 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 cross-sectional view showing the bonded state along the - line in FIG. 7. 1...Divided box, 1a...Bottom plate part, 1b...Side plate part, 1c...Top plate part, 3...PC steel material, 10...
...Backup material on the inner circumference side, 11...Backup material on the outer circumference side, 13, 13'...Resin material, 15...
Tensile material insertion hole, 16... Packing, 20... Backup material for protecting the tension material insertion hole.

Claims (1)

[Claims] 1 The divided boxes having at least a bottom plate part, both side plates, and a top plate part are integrated with one or more tension members penetrating the divided boxes, and between the opposing joining end surfaces of the divided boxes. , in a water stop construction method for a joint in an assembled underground water storage tank, in which an inner back up material and an outer back up material are provided, and then a room temperature curing resin material is injected and filled to stop water. Before joining, attach two curved packing strips to one of the joint end surfaces so as to surround the tendon insertion hole opened in the joint end surface, and attach both ends of these two packing strips to the outer surface side of the split box. A joint in a prefabricated underground water storage tank, characterized in that after joining, a room temperature curing resin material is injected and filled between these gaskets to form a back-up material for protecting tendon insertion holes. Water stop construction method.