JPS59220572A - Water-stopping construction of joint part in prefabricated underground water storge tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 a 1m bottom plate.

The joint end surfaces 1d of the divided box 1 formed into a cylindrical shape by the first plate part lb and the top plate part 1c are joined together, and the opening is covered with the end plate 2, and the divided box body 1 and the end plate 2 are divided. A plurality of PC steel members 3 arranged in the axial direction of the box 1, or a well-known embedded fitting (not shown)
etc., to form an integrated structure.

By the way, in such a prefabricated underground water storage tank, due to its structure, reliable water-stopping measures are required for the joints between the respective members.

The methods conventionally used to stop water can be roughly divided into methods shown in Fig. 1, Fig. 2, and methods to stop water by attaching a gasket 4 made of rubber, etc.
In the case of the figure, a room-temperature curing resin material is applied to the inner and outer surfaces of the joints between the divided boxes L to form a lining layer 5.
In addition, in the case of FIG.
This is a method in which back amplifier materials 6, 6 are provided around the inner circumferential side and the outer circumferential side, respectively, and then a room temperature curing resin material 7 such as epoxy resin or urethane resin is injected and filled.

However, each of these water stoppage construction methods had the following drawbacks. That is, first, in the method of using the packing 4 as shown in FIG. 1, it is necessary to attach the packing 4 to the entire joint end surface 1d of the divided boxes 1 before joining them together. Therefore, when the split boxes 1 are joined together at the site, there is a risk that the seal 4 may be partially misaligned or damaged, which may impair the water-stopping effect. Since it is made of concrete, the joint end surface is uneven, so-called a rough surface, and the seal does not fit well with the seal.Therefore, there is a physical problem that the seal does not reliably perform its water-cleaning action. In addition, in the method of providing the lining layer 5 as shown in Fig. 2, if the width d of the lining layer 5 is made narrow, there is a risk that so-called water channels will be formed, so the setting must be made over a sufficiently wide area. Moreover, this lining layer 5 has low water pressure resistance and cannot be provided on the outer surface of the bottom.
The disadvantage is that the water-stopping effect is reduced.

In addition, in the case of the resin injection method shown in Fig. 3, 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 this method of injecting a low-viscosity resin over the entire area, a problem arises in that once the injected resin passes through a damaged part of the back amplifier material and leaks out to the outside, it cannot be stopped.

If such a problem occurs at the bottom part of the joint between the divided boxes, this becomes a particularly serious problem because the bottom part cannot be repaired due to its relationship with the ground.

The present invention was made in consideration of the above points, and
Before joining the split boxes together, on one of the joining end faces,
Two gaskets extending at a distance from each other along the bottom plate are attached, and after joining, a highly viscous resin material is injected and filled between these gaskets to form the outer bottom back plate material. Then, by using a method of injecting and filling ordinary resin material with low perishability between the joint end faces, it is possible to ensure water stoppage at the joint, and the workability on site is also comparable. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIGS. 4 and 5 attached hereto.

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 l, respectively, between the opposing joining end surfaces ld, ld of the split boxes 1 to be joined to each other. A construction method is adopted in which the side back amplifier material 10 and the outer periphery waist back up material 11 are provided, and then an ordinary room temperature curing resin material with low viscosity is injected and filled to stop water.

However, in the present invention, as a back-up material provided along the bottom plate portion 1a of the divided box bodies 1 among the outer peripheral side backup materials 11, before joining the divided box bodies 1 together, one of the joint end surfaces of the divided boxes 1 is provided. As shown in FIGS. 4 and 5, two gaskets 12° 12 extending at intervals along the bottom plate portion 1a are attached, and after joining, the gaskets shown in FIG. 6 are installed between these gaskets. In this way, a room temperature curing resin material 13 having a higher viscosity than the resin material described above is injected and filled from the outer surface of the side plates of the divided box l, and is cured ζ.
The bottom band on the outer circumferential side is sufficiently thick as a whole.
A feature is that a single amplifier material 11a is formed.

Here, the two gaskets 2 and 12 may be directly attached to the joint end surface 1d, but as shown in FIG. 14 is provided in advance and the structure is attached to the groove 14, the seal 12.12 can be more securely fixed and the resin material 1 can be fixed more securely.
This is advantageous in terms of forming a sufficient space for filling 3. In addition, for the remaining outer circumferential side back up material 11 and inner circumferential side back up material 1O excluding the outer circumferential bottom back up material 111L portion, a highly viscous resin material is used after the outer circumferential side bottom backup material 11a is provided. It is preferable to form this by so-called caulking, but in some cases, it may be formed using a rubber gasket or the like.

In the present invention, since the outer peripheral bottom back-up material 11a is formed of two packing strips 12, 12 and the resin material 13 injected between them, the liquid-tight effect as a back-up material is extremely high. Also, the strength is improved. In addition, since the work of injecting and filling the resin material 13 between the packings 12 and 12 can be carried out horizontally from the outer surface of the side plates of the split box l, it is possible to inject and fill the resin material 13 between the packings 12 and 12. Even if it is material 13, it can be injected and filled with low pressure, and this resin material 1
3 has a high viscosity, so it does not leak out from between the packings 12, and even if it does leak, it hardens and stops midway, so it does not leak out in large quantities. The bottom bank-up material 11a having such a structure exhibits an extremely high liquid-tight effect as described above.
In the subsequent process, the joint end surface ld between the divided boxes 1
The resin material 7 that is injected and filled into the entire space between the joints is reliably filled without leaking out from the bottom part as in the conventional case, and as a result, the water supply at the joint is ensured. .

In addition, in the embodiment, as the resin material 13 filled between the packings 12 and 12, a resin material with higher viscosity than the resin material 7 filled between the joint end surfaces 1d and 1a was shown.
The space between the packing 12 and 12 can be filled with resin material at low pressure.
In addition, since the resin material 7 can be filled between the joint end surfaces 1d and 1a after this has hardened, it is also possible to use a resin material 13 with the same viscosity as the resin material 7 or a material with a lower viscosity. It is.

As explained above, the present invention provides a bank amplifier material that goes around the inner circumference side and the outer circumference side of the split box between the opposing joint end faces of the split box at 4 degrees. In the water stop construction method for joints in prefabricated underground water storage tanks, water is stopped by injecting and filling hardened □ resin material.
As a back-up material to be provided along the bottom plate of the split box as part of the outer circumferential back-up material, before joining the split boxes, a back-up material is placed on one of the joining end surfaces along the bottom plate at a distance from each other. Two strips of gaskets 11 extending from the gasket are placed with 11 stings, and after they are joined, a resin material with a higher viscosity than the resin material described above is injected and filled between these gaskets to form a bottom bank-up material on the outer peripheral side. Therefore, the bottom back-up material on the outer periphery, which is difficult to collect after joining, can be formed into a reliable and strong structure from the beginning. It is possible to prevent leakage of materials, thereby ensuring water-tightness at joints, and has excellent effects such as relatively good workability on site.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples, where Figure 1 is a perspective view of an assembled underground water tank, Figure 2 is a sectional view showing another conventional example of the joint water stop method, and Figure 3 4 is a sectional view showing still another conventional example of the joint water supply method, FIGS. 4 and 5 show an embodiment of the present invention, and FIG. 4 is a front view of a divided box,
This figure is a cross-sectional view taken along the line ■--■ in FIG. 4, and FIG. 6 is a cross-sectional view similar to FIG. 5 showing a bonded state. 1...Divided box, la...Bottom plate, l
b...Side part, lc...Top part, 7.
... Resin material, 10 ... Inner circumference back-up material, 11 ... Outer circumference back-up material, 11
a... Outer circumferential bottom back amplifier material, 12...
...Patsukin, 13...ah Material. Figure 1 Figure 21゛4 Figure 4 C Figure 5 Figure 6 1a

Claims (1)

[Claims] Between the facing joint end surfaces of the divided boxes formed in a cylindrical shape with the bottom plate part, both side part parts, and the top plate part, one turn is made on the inner circumferential side and the outer circumferential side of the divided box, respectively. 6) <Water stop construction method for joints in an assembled underground water storage tank, in which water is stopped by injecting and filling room-temperature hardening material after setting up a pull-up material. As a back-up material provided along the bottom plate of the box, before joining the split boxes together, two strips of packing are attached to one of the joint end faces thereof, extending at a distance from each other along the bottom plate, After bonding, it is recommended to inject and fill the space between these gaskets with a resin material to form the bottom bank amplifier material on the outer peripheral side.