JPS63300147A - Waterproof construction method of hollow elastic sealing - 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] Industrial Field of Application This invention is intended to enhance the waterproofing effect at the joints of construction structures where violent movements and high water pressure are expected, and to adapt to slight variations in joint width. It was invented as follows: An elastic sealing material that has been previously formed into a strip using a conventional sealing material is loaded into the joint groove of a structure joint using the restoring force of the elastic sealing material. This is a waterproofing method using formed elastic sealant, which is characterized in that the waterproof layer formed by the sealant after loading is hollow.

Conventional technology Conventionally, joint seals for expansion and contraction joints in structures are injected with highly viscous or fluid two- or one-component type elastic sealing materials and cured to achieve a predetermined adhesive strength. There is a general construction method to obtain this, and there is also a construction method in which a ready-made hollow pipe is buried during the construction of the above method, so that the shape of the elastic sealant becomes hollow after being filled.

Problems that the invention aims to solve The conventional construction method is to inject and fill expansion and contraction joints with a sealant whose physical properties change into a rubber elastic body over time. When the joint width changes, the volume within the groove changes sequentially, and the adhesive interface within the joint filled with the elastic sealant is exposed to the inherent tensile stress and shear of the rubber-elastic sealant. A reaction occurs. This generated stress is said to be the main cause of the peeling phenomenon at the adhesive interface, but if the generation of this stress is instantaneous, it is thought that such a phenomenon will be less likely to occur due to the development of material technology. It will be done.

However, structures are successively affected by changes in other external conditions such as outside temperature, and the joint widths of the joints of the structures also change successively, so that stress is always generated at the adhesive interface. Therefore, in conventional construction methods using conventional sealants, the generation of stress, which is the main cause of peeling at the adhesive interface, is an unavoidable problem. Furthermore, when a low modulus sealing material is used, although the generation of stress is reduced, the pressure resistance effect is also reduced at the same time, making it inconvenient to use in places where pressure is applied. Considering the stress generation situation within the joints of structures, it can be inferred that if the shape of the sealant in the expansion joints is hollow, the stress generated will be significantly reduced. A construction method was considered in which a ready-made hollow pipe was embedded as a core and the shape of the sealant inside the joint was hollow after construction (Patent No. 865918), but in actual construction, it was difficult to use a soft sealant with the characteristics of ■. It is technically difficult to embed ready-made hollow pipes evenly in the middle, and since the hollow pipes used as core materials are ready-made products, there may be variations in the joint width of the joints in the actual structure. This is a very inconvenient construction method because it cannot be fully adapted to the situation and the construction locations are limited to certain areas. The work process consisted of repeating the conventional sealing method twice, which was a time-consuming method despite its effectiveness. Based on the above considerations, a method of fabricating a hollow tube using conventional sealing material and loading it into the joint groove to form a hollow elastic sealing waterproof layer can be considered, but as a practical matter, conventional sealing material It is extremely difficult to fabricate hollow tubes from both technical and cost standpoints.

Means to solve the problem Now, I will explain the means to solve the problem with a diagram.
Prepare a square-shaped formwork with a depth of several mm and a width of about 1.5 times the construction joint width, spread the release sheet 3 inside the formwork, and apply conventional elastic sealing. After the material is injected and cured, the molded elastic sealing material 1 of the present invention is removed from the mold (FIG. 1). Next, apply the molded elastic sealing material 1 to both sides 4' of the joint groove of the structure 4.
Apply liquid sealant 2, which is made of the same material and has a viscosity that can be applied with a brush (Figure 2-2-1). Next, as shown in Fig. 1, pinch the elastic sealant 1 of the formed band plate into a U-shape, and while peeling off the release sheet 3, leave the filling depth of the molded elastic sealant 1-2 as the next joint, and groove the joint. Insert and load it inside. (Figure 3-1-1).

Then, apply the liquid sealant 2 to both sides 4' of the joint a second time (Fig. 4-2-2), deform the molded elastic sealant 1 into an inverted U shape, and peel off the release sheet 3. , the molded elastic sealing material 1-1, which has already been loaded in a U-shape, is inserted and loaded into the joint groove (Fig. 5-1-2). Next, load the molded elastic sealant 1-
Apply liquid sealant 2 to fill the valley that occurs at the joint between 2 and both sides of the joint plank (Figure 5-2-2). This is the configuration above.

Function Now, to describe the function of the hollow elastic sealing waterproofing method using the strip-formed elastic sealant 1, the molded elastic sealant 1 of the present invention is inserted while being deformed from a flat strip shape into a U-shape. Due to this, a restoring force is generated, and due to the action of the generated restoring force, the molded elastic sealing material 1 at the beginning of construction is supported and fixed on the inner surface of the joint hole.

Most of the liquid sealant 2 applied as an adhesive to the side surface of the joint joint is pushed away when the molded elastic sealant 1 is inserted, but the surface tension of the liquid sealant 2 acts on the side surface of the joint joint ( 3-4') and the molded elastic sealing material 1-1 (Fig. 3) deformed into a U-shape, fill the valley as shown in Fig. 3-2-1.
After curing, the molded elastic sealing material 1-1 deformed into a U-shape is fixed in the joint groove as an adhesive having rubber elasticity. In addition, the molded elastic sealing material 1-2, which has been deformed into an inverted U-shape as a successor, and the liquid sealing material 2 as an adhesive are loaded.
The same applies to the effect of -2. As described above, a hollow elastic sealing waterproof layer is formed in the joint groove, and the effect of the now hollow sealant in the joint groove of a structure will be described with reference to FIG. 6. Since the material also has a hollow oval cross-sectional shape within the joint groove, if the joint width changes, the elastic sealing material will change as the joint width changes (Figure 6-b, b').
Because the curved surface of the arch part of the section follows while bending,
The stress generated at the loading interface occurs in sections b and b', and does not occur in section a.

Other Examples (1) With regard to the shape of the elastic sealing material molded into the strip in the present invention, the effect remains the same even if a flat shaped molded product with no undercuts is used as shown in FIG.

(2) When implementing the present invention, depending on the construction location, there is no change in the waterproofing effect even if half of the steps in the construction method of the present invention are implemented, as shown in Figure 8.

(3) It is effective to change the modulus values of the molded elastic sealant 1 of the present invention and the sealant 2 as an adhesive depending on the construction site.

(4) Even if the liquid sealant 2 used as the adhesive in the present invention is replaced with a paste sealant, the effect remains the same.

(5) If an anti-slip agent is attached to both ends of the molded elastic sealant of the present invention as shown in FIG. 9, the effect of the molded elastic sealant will be improved when it is inserted into the joint groove.

(6) When the molded elastic sealing material of the present invention is appropriately notched on both ends corresponding to the inside of the U-shape, it becomes easier to handle curved corners, such as rising from a floor to a wall.

Effects of the Invention To describe the effects of the method of the present invention, the hollow elastic sealant 1-1.2 at the beginning of construction before the liquid sealant 2 hardens has a repulsive force of the rubber elasticity of the molded elastic sealant 1. Since the liquid sealant 2 easily follows changes in the sealing material and the liquid sealant 2 quickly adapts to such changes, it is hardly affected by changes in the joint width at the bonding interface.

Next, within the joint after the liquid sealant 2 has hardened, the molded elastic sealant 1-1.2 is fixed within the joint with rubber elasticity by the liquid sealant 2, and the hollow elasticity Arch of sealant (Fig. 6-D,
By quickly following D'), the generated stress is significantly reduced compared to the conventional sealing method. Furthermore, since the product shape of the formed elastic sealing material, which is the main material of the method of the present invention, is a strip, it is easy to manufacture, and the product can be stored in rolls, so the packaging shape becomes compact and the product can be easily manufactured. It is also very convenient for delivery.

In addition, since the main work in the construction of the present invention is loading by inserting the formed product, it does not require drawing techniques and anyone can easily and uniformly perform the work, compared to the work in conventional sealing waterproofing construction methods. The subsequent curing period is shortened. Although elliptical structures are generally considered to have a high pressure resistance effect, the waterproofing method of the present invention also has an elliptical hollow tube shape within the groove, making it difficult to install in locations where high water pressure is expected. It is very effective.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional perspective view of a molded elastic sealing material used in the present invention. FIG. 2 is a partial perspective view, partially in section, during the implementation of the present invention. FIG. 3 is a partial perspective view, partially in section, during the implementation of the present invention. FIG. 4 is a partial perspective view, partially in section, during the implementation of the present invention. FIG. 5 is a partial perspective view, partially in section, during the implementation of the present invention. FIG. 6 is a cross-sectional view after implementing the present invention. FIG. 7 is a partial perspective view of another example of a molded elastic sealing material. FIG. 8 is a cross-sectional view of another embodiment. FIG. 9 is a perspective view and a cross-sectional view of another embodiment. 1... Molded elastic sealing material, 1-1... Former forming elastic sealing material, 1-2... Back forming elastic sealing material, 2... Liquid sealing material, 2-1...
・First liquid sealant, 2-2... Back liquid sealant, 3... Release sheet, 4... Structure, 5... Anti-slip agent.

Claims (1)

[Claims] Two pieces of elastic sealant molded into a strip 1, deforms into a U-shape and an inverted U-shape, and the elastic shell - Sealing material 2 made of the same material as ring material 1. As an adhesive, it can be used in the joint grooves of structural joints. Insert and fill to form a hollow waterproof layer. Below Hollow elastic sealing barrier configured as above Water construction method.