JPH0315689Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a caulking structure for concrete structures in the fields of architecture and civil engineering.

[Prior art and its problems]

For example, in concrete structures such as tunnel shield segments and waterway box culverts, joint joints are often provided to accommodate shrinkage of the concrete structure. In the conventional joint structure, as shown in FIG. 1, a joint groove 2 formed by concrete structures 1 and 1' is filled with an epoxy resin joint caulking agent 3.

However, this epoxy resin joint caulking agent 3 has poor elasticity and strong adhesive strength, so if movement or vibration occurs on the joint surface, it may cause cracks in the structure itself. becomes.

Also, if the adhesive surface is damp (this is especially common in civil engineering construction, such as building tunnels and waterways),
There is also a risk that the adhesiveness of the caulking material 3 will weaken and a portion of the adhesive surface will peel off, allowing water to leak from there.

In order to prevent such drawbacks, some joints have a backup material 4 made of closed cell foam such as polyethylene inserted deep into the joint groove 2, as shown in FIG. By inserting this back-up material 4, it is possible to prevent the joint groove 2 from being glued on three sides (both sides and the bottom) as shown in Figure 2, and to prevent cracks in the structure itself when it is subjected to loads due to external pressure as a two-sided adhesive. However, since the backup material 4 does not have a waterproof effect, there is still a risk of water intrusion if water enters the deep part of the joint groove 2 in which it is installed.

Therefore, in order to solve the above-mentioned disadvantages, the inventor first proposed a joint joint structure using a water-swellable composition as a sealing material. This is described in Utility Model Application No. 57-159977 (Utility Application No. 56-47109), and as shown in FIG. A sealing material 5 is inserted, and a joint material 6 is applied thereon using epoxy resin, urethane resin, etc. in civil engineering work, or silicone resin, polysulfide resin, etc. in construction work.

In this way, the sealing material 5 will be in a completely sealed state, and if there is water intruding from deep into the joint, it will interact with water and swell, and the swelling pressure will cause the joint joint groove 2 to be confined. Deep spaces can be reliably sealed.

However, since the sealing material 5 is a water-swellable composition, the swelling concentrates in the direction of the opening of the joint groove 2 where the water-swelling effect is large, pushing the joint material 6 outward or causing the sealing material 5 itself to protrude outward. There is a risk of

[Purpose of invention]

The purpose of the present invention is to eliminate the drawbacks of the conventional examples, and to increase the degree of swelling of the sealant when caulking is performed using a sealant made of a water-swellable composition, thereby ensuring a reliable water-stopping effect. To provide a caulking structure for a concrete structure having a simple structure, which can completely prevent the sealing material or the filler material above the sealing material from jumping out to the outside in case of a case, and ensure quality and appearance.

[Summary of the idea]

However, the purpose of the lever is that, according to the present invention, a water-swellable polymer material such as swellable polyurethane resin or swellable polyvinyl is added to the bottom of the cut groove for caulking, which is a repair groove formed at the joint joint or the hair crack occurrence area. A water-swellable composition mainly composed of is placed as a back-up and sealing material, a foam is placed on top of it as a cushioning material to prevent the water-swellable composition from coming out, and a top and bottom joint filler is filled on top of the foam. This is achieved by having a three-layer structure.

[Example of idea]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a longitudinal sectional front view showing the first embodiment of the present invention, in which the same components as in FIG. 3 showing the conventional example are given the same reference numerals.

In the figure, 1 and 1' are concrete structures such as shield segments of tunnels, box culverts of waterways, or external walls of buildings, and 2 are the structures 1 and 1'.
This figure shows a joint joint groove consisting of a cut groove formed in the joint part.

A string-like water-swellable composition 7 is placed at the bottom of the groove 2 as a back-up and sealing material, but it is not necessarily necessary to fit it exactly with the bottom of the groove 2 from the beginning. The water-swellable composition 7 is a composition based on a water-swellable polymeric substance such as a swellable polyurethane resin or a swellable polyvinyl.

Furthermore, a string-like foam 8 was similarly inserted above the water-swellable composition 7, and a joint filler 9 was filled thereon. The foam 8 serves as a cushioning material, and is suitably made of synthetic resin or synthetic rubber, for example. Similarly to the joint filler 6, the joint filler 9 uses epoxy resin, urethane resin, etc. in civil engineering applications, and silicone resin, polysulfide resin, etc. in construction applications.

In this way, the water-swellable composition 7 reacts with water over time and gradually swells to exhibit a sealing effect and a back-up effect, and at this time, the swelling upward, that is, toward the opening of the groove 2, is caused by foaming. Absorbed by body 8. Therefore, the joint filler 9 and the water-swellable composition 7 themselves do not protrude from the joint groove 2.

Next, FIGS. 5 to 7 show examples in which the caulking structure of the present invention is used to repair hair cracks in concrete structures. When a hair crack 11 occurs in a concrete structure 10 as shown in FIG. 5, in order to repair water leakage from the crack 11, a cut groove 12 is usually cut from the surface as shown in FIG.
form. Then, as shown in FIG. 7, a water-swellable composition 7 is provided at the bottom of the cut groove 12 as in the case of the joint groove of the first embodiment, and a foam 8 as a cushioning material is inserted thereon. Then, a filler 13 is applied thereon. The filler 13 is made of the same material as the joint material 9.

The water-stopping effect and the buffering effect of the foam 8 in the case of hair crack repair are the same as in the first embodiment, so detailed explanations will be omitted.

[Effect of idea]

As mentioned above, the caulking structure of the concrete structure of the present invention uses a water-swellable composition as a sealing material, and its swelling effect completely prevents gaps and provides highly accurate water stoppage, while also increasing the degree of swelling. In both cases, there is no risk that the filler, etc. in the groove opening will protrude outside. In addition, good quality and good appearance can be ensured in concrete structures.

[Brief explanation of the drawing]

Figures 1 to 3 are vertical sectional front views showing a conventional joint structure, Figure 4 is a vertical sectional front view showing a first embodiment of the caulking structure of the present invention, and Figures 5 to 7 are a second embodiment. FIG. 3 is a longitudinal sectional front view showing each process. 1, 1'... Concrete structure, 2... Joint joint groove, 3... Caulking material, etc., 4... Backup material, 5... Sealing material, 6... Joint filler, 7...
Water-swellable composition, 8... Foam, 9... Joint material,
10... Concrete structure, 11... Hair rack, 12... Cut groove.

Claims (1)

[Scope of utility model registration request] A water-swellable composition based on a water-swellable polymeric substance such as a swelling polyurethane resin or a swelling polyvinyl is applied to the bottom of the cut groove for caulking, which is a repair groove formed at a joint joint or a hair crack occurrence area. Concrete is characterized by having a three-layer structure, which is placed as a back-up and sealing material, a foam is placed on top of the foam as a buffer material to prevent the water-swellable composition from coming out, and a joint filler is filled on top of the foam. Caulking structure of the structure.