JPS636246Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of the joint between a concrete structure and a water-shielding sheet, and more specifically, the structure of the joint between a concrete structure and a substrate to be constructed such as adjacent earth and sand. This invention relates to a structure for attaching a water-shielding sheet to a concrete structure with a high water-shielding effect, which is laid at the boundary to prevent water leakage.

For example, in the construction of linings with water-shielding sheets in the civil engineering field, such as reservoirs, drainage channels, regulating ponds, and pollution prevention landfill ponds, the joint structure between water-shielding sheets and concrete structures has been widely practiced. As shown in FIG. 1, the means for fixing the water-blocking sheet 5 to the concrete structure, which is laid at the boundary between the substrate 1 to be constructed such as earth and sand and the adjacent concrete structure 2, is a concrete structure. A reinforcing sheet 3 is pasted by applying an adhesive layer 4a to the surface of the object 2, and a water-blocking sheet 5 is applied to the surface of the reinforcing sheet 3 via an adhesive layer 4b beyond the boundary to protect against construction materials such as earth and sand. Extending to one part of the body, the entire length of the closing part of the water-blocking sheet 5 is made of aluminum,
It is held down with a band plate 6 made of metal such as stainless steel and fixed using anchor bolts 7 arranged at a plurality of locations at predetermined pitches, and the entire length of the closed part of this water-shielding sheet is covered with a sealing material 8. Fixation means were the most common.

However, in the case of the above-mentioned joint structure illustrated above, the adhesive 4 alone is insufficient to firmly fix the water-blocking sheet 5 on the base of the concrete structure 2, and as a supplement, a metal strip is used. Plate 6 or anchor bolt 7 must be used together,
Naturally, the joint structure becomes complicated, and if a gap or step occurs between the substrate 1 to be constructed such as earth and sand and the concrete structure 2, the water-blocking sheet 5 itself may suffer damage such as cracks due to this. In consideration of this point, the reinforcing sheet 3 needs to be placed on the back side of the water-blocking sheet 5 in advance, making the joining structure even more complicated. In addition, when using a synthetic rubber adhesive such as chloroprene or butyl as the adhesive used at this time,
Evaporation of moisture contained in the concrete structure may cause the underlying surface of the concrete structure to become wet, resulting in poor adhesion, or when an epoxy resin adhesive is used, the adhesive may harden. Skill is required for various treatments during the curing period, which tends to limit its use. As described above, if the adhesive is an essential component and is not used properly, a peeling phenomenon may occur between the adhesive layer and the base of the concrete structure, which may lead to water leakage.

This invention improves the various defects inherent in even one of the conventional construction examples described above, and allows the water-blocking sheet to be easily, reliably and firmly fixed on the base of a concrete structure. At the same time, we propose a structure for the joint between a concrete structure and a water-shielding sheet that can fully cope with and withstand the behavior of the base of a concrete structure. The downwardly bent portion of the relay member, which is formed along the edge and has a hook portion at the tip of the bent portion, and has an overall end face shape of an inverted L-shape, is connected to the concrete adjacent to the structure to be constructed such as earth and sand. The water-shielding sheet is buried in the base of the structure, and the end of the water-shielding sheet is surface-fitted to at least the horizontal surface of the relay member located on the base of the concrete structure, and the end of the water-shielding sheet is flushed with the horizontal surface of the relay member located on the base of the concrete structure. The water-shielding sheet is laid so as to cover the boundary area, and the water-shielding sheet laid at the boundary line between the concrete structure and the adjacent structure to be constructed is stabilized. , and simplification of the installation work.Next, a concrete example of this invention will be described with reference to the drawings.

Figure 2 is a longitudinal cross-sectional view of a water-shielding sheet part installed at the boundary line between a concrete structure and an adjacent structure to be constructed and joined to the concrete structure.
Reference numeral 3 denotes a relay member, which is formed by bending one longitudinal edge of the sheet body to form a downwardly bent portion 14 along the edge of the horizontal surface portion 15, and further has a hook portion having a triangular cross section at the tip of the bent portion 14. 16a is integrally formed, and the overall end face shape is inverted L-shape. The hook portion formed at the tip of the bent portion 14 is this inverted roof-shaped hook portion 16b.
(Fig. 3), or a bent hook portion 16c formed by folding the tip of the bent portion 14 further inward (Fig. 4)
The shape of the hook portion 16 that can increase the engagement force with the concrete structure can be changed and selected as appropriate.

This relay member 13 is made of thermoplastic elastomer such as olefin-based or styrene-based,
The bent portion 1 is selected to have a hardness of 80° or more in consideration of the convenience of partially embedding it in a concrete structure, and is bent downward from the edge of the horizontal surface portion 15.
4 is not limited to a shape that hangs at right angles to the horizontal surface portion 15, but may form a downwardly bent portion 14 having an acute or obtuse intersecting angle with respect to the horizontal surface portion.

The above-mentioned relay member 13 is constructed using a construction material 1 such as earth and sand.
The downward bent part 14 is buried in the subsurface part of the concrete structure 12 adjacent to the concrete structure 12 adjacent to the boundary line 10 between the concrete structure 11 to be constructed, and the presence of the hook part 16 at the tip of the bent part. The horizontal surface portion 15 of the relay member 13 is connected to the concrete structure 1 while maintaining an even stronger engagement state with the concrete structure.
2 or preferably on the substrate 11 to be constructed.
It is laid in a floating manner, extending to the underlying ground.

The horizontal surface portion 15 of the relay member 13 fixed to the base surface of the concrete structure exposed above the base surface of the concrete structure is made of ethylene propylene polymer (EPT) and butyl rubber (IIR).
or a mixture of these EPT and IIR or other thermoplastic elastomers with a thickness of 0.5
One end edge of the water-shielding sheet 17 with a thickness of ~3.0 m/m is heat-sealed into a surface shape, and the water-shielding sheet 17 covers 10 parts of the boundary line between the substrate 11 to be constructed such as earth and sand and the concrete structure 12, Furthermore, it extends to the base surface of the substrate 11 to be constructed. The surface heat fusion of the relay member 13 and the water-shielding sheet 17 is performed at a fusion temperature of 300 to 300, for example.
Hot air at 600°C is blown onto the back surface of the water-shielding sheet 17, and the melted resin surface is applied to the horizontal surface 1 of the relay member 13.
5 by surface bonding and rolling at the same time.

In this invention, the downward bent portion 14 of the relay member 13 is inserted into the concrete structure 12,
Furthermore, the hook portion 16 provided at the tip of the bending portion 14 engages with the structure, and the force to prevent the removal of the structure can be mechanically increased in multiple stages. Since the surface is fused to the surface using the thermal welding power of the water-shielding sheet, the highly watertight joining is achieved using an extremely simple mechanism, so no special mounting hardware or other sealing materials are required. This eliminates the need for fixing the water-shielding sheet, making it possible to simplify the work of fixing the water-shielding sheet. In addition, by laying the horizontal surface part of the relay member over the base surface of the concrete structure and even the base surface of the substrate to be constructed such as earth and sand, it may occur at the boundary between the concrete structure and the substrate to be constructed. It has a sufficient reinforcing effect against the occurrence of steps or gaps, and both relay members and water-shielding sheets are suspended from the underlying surface of the concrete structure, earth and sand, etc. Therefore, even if cracks or the like occur in the base, the relay members and the water-shielding sheet will not be mechanically affected, and each member will be able to maintain its original intended purpose for a long period of time. be.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing the joint structure between a conventional concrete structure and a water-shielding sheet, and Figure 2 is a vertical cross-sectional view showing the joint structure between a concrete structure and a water-shielding sheet in which this invention has been implemented. , 3 and 4 are diagrams corresponding to FIG. 2 showing other embodiments. In the figure, 11 is a substrate to be constructed such as earth and sand, 12 is a concrete structure, 13 is a relay member, 14 is a downwardly bent part, 15 is a horizontal surface part, 16 is a hook part, and 17 is a water-shielding sheet.

Claims (1)

[Claims for Utility Model Registration] (1) A relay with a generally inverted L-shape in overall end face shape, in which a downwardly bent portion is formed along the edge of a horizontal surface portion, and a hook portion is further provided at the tip of the bent portion. The downward bent part of the member is buried in the base of the concrete structure adjacent to the substrate to be constructed such as earth and sand, and the end of the water-shielding sheet is buried at least on the horizontal surface of the relay member located on the base of the concrete structure. A joint between a concrete structure and a water-shielding sheet, characterized in that the water-shielding sheet is laid to cover the boundary between the concrete structure and an adjacent structure to be constructed. structure. (2) A joint structure between a concrete structure and a water-shielding sheet as set forth in claim 1 of the registered utility model, wherein the connection between the relay member and the water-shielding sheet is achieved by thermal fusion of the water-shielding sheet. .