JPS6363828A - Water-proof junction for concrete structure - Google Patents

Abstract

PURPOSE:To completely stop flow of water by a method in which an expandible water-stopping material is set on the outside of the recessed groove or projected part of split concrete structures, pressed by upper and lower concrete structures, and bonded to the structures by an adhesive injected into the recessed groove. CONSTITUTION:An adhesive 1 is injected into the recessed groove b-2 of one part (b) constituting a concrete structure, and an expandible water-stopping material 2 is set over the whole surface of the joints b-3 and a-13 on the outside of the groove b-2 or of the projected part a-2 of the other part. The upper and lower parts (a) and (b) between which the material 2 is interposed are pressed and bonded to each other by the adhesive 1.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention combines divided members to create manholes, fire prevention water tanks, septic tanks, pump tanks, tunnel shafts, passageways, waterways, communal ditches, basements, etc. This invention relates to waterproof joints of combined joint surfaces when constructing concrete structures.

(Prior art) Normally, most concrete structures having arbitrary shapes are shaped in advance at a concrete molded product manufacturing factory for convenience of workability and transportation, or due to technical difficulties. The structure is manufactured by dividing it into several members, these are transported to a construction site, and the divided members are assembled and constructed to form the concrete structure, which is then installed.

For example, as shown in FIG. 1, a concrete manhole structure is manufactured by being divided into approximately six members in advance, and assembled and buried at a construction site. In the same figure, (a) is a partial cross-sectional perspective view, (b) is a vertical cross-sectional view, and (c) is a vertical cross-sectional view in a direction perpendicular to (b).
It consists of a three-piece block 11, a straight wall 12, a single swash plate 13, an adjustment block 14, and an I receiving frame 15.

However, when assembling these divided parts, it is necessary to completely waterproof the joints of each part to prevent water from entering from the outside into the assembled structure, and at the same time to ensure that no misalignment occurs. It must be completely adhered.

Conventionally, attempts have been made to apply adhesive to the joints of these assembled structures for the purpose of waterproofing and adhesion, but waterproofing has been difficult and not sufficient. On the other hand, by changing the shape of a part of the abutting surface, for example, one side is made into a groove and the other side is made into a convex part, the bonding area can be widened and the adhesive strength can be increased. Attempts have also been made to improve the yield of adhesive by creating voids in the material to strengthen sealing and adhesion, and to prevent misalignment due to stress from stacking.

However, even with such consideration given to the shape of the bonding surfaces, the method using adhesives has the drawback that, although adhesion may be possible, the waterproof effect is insufficient to withstand water intrusion. Therefore, a method was devised called composite adhesive, which combines multiple adhesives and other components to take advantage of the characteristics of each. For example, a composite adhesive in which a sponge-like carrier is impregnated with adhesive is bonded. A method was proposed in which the material was layered in a concave groove at the bottom and pressed with a member having a convex surface on one side for waterproof bonding. (According to Japanese Patent Publication No. 47-47702) However, even with these methods, after the adhesive has hardened, contact surface leakage tends to occur between the surface of the concrete joint surface and the surface of the hardened adhesive bonded to the surface. there were.

Therefore, the present inventors proposed a waterproof joining method using a composite sealing material as shown in FIGS. 2(a) and 2(b) as a further improved method. (Unexamined Japanese Patent Publication No. 61-12217
According to No. 5) According to this method, the adhesive strength of both structures is determined by the adhesive 1 on the joint surface, which is the same as in the conventional method, but as shown in Fig. 2 (a), the adhesive strength of the two structures is Jb-
The swellable water stop material 2 is placed approximately on the center part of the bottom of the structure 2, and is sandwiched between it and the convex bank a-2 of the upper structure a as shown in FIG. Moisture that has entered the contact surfaces between the bonding surfaces a-1 and b-1 corresponding to the outside and the adhesive 1 is removed by the swellable water stop material 2.
On the other hand, the swellable water stop material 2 absorbs water and expands in volume, and waterproofing is achieved by the pressure applied to the contact surfaces of a-2 and b-2 by the expansion.

(Problems to be Solved by the Invention) It has been found that the method carried out by the present inventors in the above-mentioned Japanese Patent Application Laid-open No. 122175/1988 still has the following drawbacks.

1) Complete waterproof bonding is possible if the joint surfaces of each member of the divided concrete structure are manufactured as designed or in a state close to this, but as manufacturing is repeated,
The formwork is worn out and this appears as distortion on the joint surface, or an error occurs in the depth of the groove b-2 or the height of the protrusion a-2 on the joint surface, causing the groove b-2 to become distorted during joining. There is a partial difference in the gap between the bottom surface of the groove and the top surface of the convex levee a-2, so that the swellable water stop material 2 placed at the center of the bottom of the groove b-2 There will be parts that are not sufficiently pressed and clamped by the top surface of the convex embankment a-2, causing leakage.

If the swellable water stop material 2 is made thicker, the recess 1b-2 and the convex embankment a-
If you try to deal with the unevenness of the gaps in 2,
The collapse of the concrete structure due to its own weight becomes insufficient,
The gaps between the bonding surfaces a-1 and a-3 of the upper part +)ra and the bonding surfaces b-1 and b-3 of the lower member become so large that adhesion becomes impossible.

2) When the temperature is between 1°C and 20°C, the hardening time of the adhesive is significantly delayed, but as mentioned above, the adhesive and waterproofing measures are performed at the same time when assembling each divided concrete member at the construction site. Therefore, it may take several days for the adhesive l to harden during construction in winter when the outside air temperature is low. However, because the construction is carried out on-site, water is forced to enter from the outside even though the adhesive 1 is in an uncured state, and this is especially noticeable in the case of underground concrete structures, which causes the central part of the groove b-2 to leak. Adhesive 1 that exists on the outside with the swellable water stop material 2 located in
(corresponding to approximately 1/2 of the entire adhesive) is not cured due to the infiltrated water, resulting in defects in adhesion.

3) When assembling each divided concrete member, on the adhesive surface, the adhesive 1 injected into the groove b-2 of the lower member is applied to the convex part of the upper member into the groove b-2. a
-2, the member joint surfaces a-1, a-3 and b-
Although it overflows to the joint surface of 1 and b-3, the member contact surface a-La-
3, b-1, and b-3 do not necessarily mean that adhesive 1 is present on all surfaces (the concrete parts are still in contact with each other, or there are parts that are in close contact with each other). For this reason, a) Adhesive 1 does not act as a buffer material, and vibrations during assembly, shocks when drilling a part of the structure, earthquakes and other external vibrations, etc. Directly applied to the entire structure, cracks may occur on the concrete surface of the structure,
Peeling may occur at the joint.

b) For horizontal and height adjustment of concrete structures (
stomach.

There are drawbacks such as.

In the present invention, an adhesive 1 is injected into one groove b-2 of a part O constituting a concrete structure, and a member corresponding to the outside of the groove b-2 or the outside of the convex embankment a-2 is used. Joint part (a-3
, part b-3), the swellable water-stopping material 2 is placed over the entire circumference, and is held between the members having the joint part provided with the other protruding embankment a-2, and then the above-mentioned known technique is applied. It is an object of the present invention to provide a waterproof joining method for concrete structures that improves the existing drawbacks.

(Means for solving the problem) As shown in Fig. 3, fluid adhesive 1 is injected into one recess 1b-2 of the opposing joint surfaces of members a and b of the divided concrete structure. and the other opposing convex embankment a-2
When bonding by fitting into the groove b-2, any part of the joint surfaces a-3 and b-3 outside the recess 1b-2 or the protrusion a-2 among the opposing joint surfaces. The swellable water stop material 2 is placed over the entire circumference of the concrete structure, and is bonded with the adhesive l while being pressed between the members a and b of the upper and lower concrete structures.

In addition, adhesive 1 does not lift the concrete structure,
Epoxy-based adhesives and acrylic-based adhesives are used because they require strong adhesive strength so that the joints do not easily separate when being moved, but in particular adhesives containing epoxy and sealant as the main components are used. Adhesives are preferred. In addition, even if water enters from the joint surface, the swellable water stop material 2 absorbs this water and causes volumetric expansion, completely closing the gap and stopping water.For example,
String-like or band-like products are used, which are formed by kneading swelling urethane resin, swelling polyvinyl alcohol, swelling acrylic resin, etc. that swells with water, and a rubber compound that maintains appropriate adhesiveness and plasticity. be done.

(Function) As described above, in the present invention, any one of the opposing joint surfaces outside the groove b-2 or the protrusion a-2.

The swellable water-stopping material 2 is placed around the entire circumference of the location, and the swellable water-stopping material 2 is pressed between the upper and lower concrete structures and bonded with the adhesive 1, so that the joint surface is Even if it is slightly distorted, it can completely stop water.

(Example) Fig. 1 shows a manhole structure in which the joining method of the present invention was applied, in which (a) is a partial cross-sectional perspective view, (b) is a longitudinal cross-sectional view,
(C) is a vertical sectional view taken in a direction perpendicular to (B). First, 10 parts of the bottom plate were mixed together, and a modified epoxy resin as the main rule and a hardening agent polyamide amine (trade name: Power Pond, manufactured by Three Bond) were mixed in a ratio of 50 parts by weight of the hardening agent to 100 M parts of the main rule. This is injected into Jffi over the entire circumference of the concave groove b-2 on the joint surface of the bottom plate block 10, which has been cleaned and dried with a cloth or brush, and then onto the outer peripheral side b-3 of the joint surface of the bottom plate block 10. After kneading a vulcanized rubber compound and a swellable urethane resin and molding it into a string shape using an extrusion molding machine, a swellable water stop material 2 (trade name: Power Seal manufactured by ThreeBond) is placed over the entire circumference. , the convex a-2 of the upper frame block 11 is placed so as to fit between the grooves b-2, and the joint surface a-1
, b-1, and the swellable water stop material 2 is sandwiched therebetween.

FIG. 3 is an explanatory diagram of the joining method of the present invention, and (a) shows the joining surfaces b-1 and b-3 of the lower member b (for example, the bottom plate block 10) and the groove b-2 in the state before joining. and the joint surfaces b-1, b-3 of the upper member a (for example! door block 11) and the convex embankment a
-2 is shown, and (b) is a state in which adhesive 1 is injected into the groove b-2 immediately before joining, and the swellable water supply material 2 is placed over the entire circumference on the outer joint surface b-3. In the case shown in (c), the joining is completed and the swellable water stop material 2 is pressed between the upper and lower members a and b. In this way, the straight wall 121, the single swash plate 13. Adjustment block 14. A manhole structure was constructed by assembling each member such as the cover frame 15.

In order to test the manhole structure constructed in this way, iron balls with diameters of 11 and 21 were intentionally sandwiched between two parts of the joint surface to distort the joint surface. I put it in an aquarium and poured water into the aquarium. After 24 hours had elapsed in this way, when the topmost member of the manhole structure, for example, the cover holder frame 15, was lifted upward by a crane, the whole thing was lifted as one piece, so that the adhesive 1 had completely hardened and had enough It was confirmed that it has adhesive strength.

Further, even after 7 days had passed, no water had entered the inside of the manhole structure, and the water-stopping effect of the swellable water-stopping material 2 was recognized.

(Effects of the Invention) As described above, according to the present invention, even if the joint surfaces of the concrete structure are slightly distorted, water can be completely stopped and the adhesive 1 can be quickly and completely cured. Furthermore, since it is completely waterproof, the adhesive 1 can be completely cured even in cold regions.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 shows a manhole structure in which the joining method of the present invention is applied, in which (a) is a partial cross-sectional perspective view, (b) is a longitudinal cross-sectional view,
(c) Shown is a vertical cross-sectional view taken in the direction perpendicular to (b). Fig. 2 is an explanatory diagram of the conventional waterproof joining method. (a) shows the state immediately before joining. (b) shows the state after joining is completed. 3 is an explanatory diagram of the joining method of the present invention, (a) shows the state before joining, (b) shows the state immediately before joining, and (c) shows the state after joining is completed. be. a, b: Each member of the concrete structure, 1: Adhesion H
12: Swellable clean water material. 1=″″−21 Agent Patent attorney Ishido □ Gen ) Ki 2 eyes (in (υ) Suri (c) 1θ

Claims (1)

[Claims] When a fluid adhesive is injected into one of the grooves on the opposing joining surfaces of each member of the divided concrete structure, and the other opposing protrusion is fitted into the groove and bonded, the above-mentioned A swellable water-stopping material is placed over the entire circumference at any location on the outside of the concave groove or convex bank on the opposing joint surfaces, and the swellable water-stopping material is pressed between the upper and lower concrete structures. A waterproof joining method for concrete structures, characterized in that the waterproof joining method of concrete structures is performed using the adhesive described above.