JPH0960023A - Sealing method for junction of concrete member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable water to be cut off even if concrete members have moved relative to each other by providing grooves in the mating surfaces of the connected concrete members and opposite to each other, and filling a hole formed between the grooves with a thermosetting resin. SOLUTION: Each concrete member 1 formed into a plate shape has in its mating surface a polygonal-cross-section deep groove 2 provided continuously along its longitudinal direction. When the members 1, 1 are connected together, the deep grooves 2, 2 in their mating end faces are opposed to each other and form a relatively wide hole, into which a thermosetting resin 7 is injected as a sealant to fill it. The resin 7 is formed into a layer that is relatively thick in a direction perpendicular to the mating end faces and easy to deform when exerted with shearing forces in a direction parallel to the mating end faces, so that even if the mating end faces of the members 1, 1 are moved as the result of earthquakes, etc., peeling of the sealant from the members 1 can be prevented by deformation of the resin 7, resulting in enhanced reliability of the water cutoff performance of the junction of the members 1, 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing method for waterproofing and waterproofing joints of a plurality of concrete members (precast concrete members). More specifically, a joint portion of concrete members when a plurality of plate-shaped concrete members are connected to construct a concrete structure that requires waterproofing and waterproofing such as tunnels, water tanks, floor slabs, basement walls, and basements. Regarding the sealing method of.

[0002]

2. Description of the Related Art Concrete structures such as tunnels, water tanks, floor slabs, underground walls, and basements are sometimes constructed by connecting a plurality of plate-shaped concrete members (precast concrete members). In this case, for structures such as tunnels, basement walls and basements that form a space below 2000 mm from the surface of the earth, there is a high degree of reliability against the intrusion of groundwater, rainwater, etc. from the outside at the joints of concrete members. It is necessary to prevent water leakage from the inside in a water tank that stores a large amount of water.

On the other hand, as a conventional method for sealing a joint portion of a concrete member, there is known a method in which a concave portion and a convex portion which are fitted with each other are provided on a joint surface of the concrete member, and an adhesive is applied between them. In a concrete block, a method is known in which a hole formed by facing concave joint surfaces to each other is filled with mortar.
Further, in Japanese Patent Laid-Open No. 52-118816, a groove having an open bottom is provided on a joint surface of a concrete member, and a grout material is filled in a hole formed by the grooves facing each other. A method of giving an anchor effect to a material is disclosed.

[0004]

When concrete structures such as tunnels, water tanks, floor slabs, basement walls, and basements are constructed by connecting a plurality of concrete members, it is possible that the concrete members are displaced due to an earthquake or the like. Need to deal with. However, in the above-described sealing method, if a gap occurs between the joint surfaces of the concrete members, the sealing material (mortar,
There was a problem that cracks occurred around the joint surface of the grout material) or the concrete member, making it impossible to stop water and waterproof.

The present invention has been made in view of such problems of the prior art.
The purpose of the present invention is to provide a sealing method that can stop the water from joining joints even if they are displaced from each other, taking into consideration the characteristics of the sealing material, the shape of the filling portion of the sealing material, etc. It is a thing.

[0006]

The features of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are as follows.
Grooves are provided in the joint surfaces of the concrete members to be connected so as to face each other, and the thermosetting resin is filled in the holes formed between the grooves due to the connection of the concrete members. The groove on the joint surface of the concrete member is composed of a deep groove arranged in the center and shallow grooves continuous in steps on both sides thereof, and by joining the concrete members, a pair of front and rear grooves formed between the shallow grooves is formed. It is preferable to mount an elastic material in a compressed form in the gap and fill the holes formed between the deep grooves with a thermosetting resin.

Further, it is preferable that the side surface of the groove of the joint surface of the concrete member is subjected to a mold release treatment, and the thermosetting resin filled in the groove of the joint surface has a breaking elongation of 20% by a tensile test.
It is above, and it is preferable to consist of a thermosetting resin which has reactivity.

The concrete member is suitable for forming a concrete structure by being formed into a plate shape and connecting a plurality of members.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first example of the embodiment of the present invention. In the figure, 1 is a concrete member (precast / concrete member), and the concrete member 1 is formed in a plate shape (arc shape, linear shape, L shape, etc.), and by connecting a plurality of them, a tunnel is formed. , Aquarium,
It constitutes a concrete structure that requires waterproofing and waterproofing for floor slabs, basement walls, basements, etc. Although the concrete members 1 and 1 can be connected by various methods, for example, connecting metal fittings having bolt holes are fixed to predetermined positions on the joint surfaces of the respective concrete members 1, and the connecting metal fittings are subjected to high tension. It can be connected by fastening via bolts and nuts.

On the joining surface (side end surface) of the concrete member 1, a deep groove 2 having a polygonal cross-section is formed continuously in the longitudinal direction (vertical direction) of the concrete member 1 separately from the connecting means such as connecting fittings. Is provided. The cross-sectional shape of the deep groove 2 is not particularly limited, but from the viewpoints of molding of the concrete member 1, demolding workability, the sealing effect and the cost of the sealing material, etc., (a) and (b) of the figure. The shape (rectangle or trapezoid) shown in is preferable. Further, the bottom surface of the deep groove 2 is preferably parallel to the joint surface. Deep groove 2
As for the dimensions, the depth is 2 mm or more, and the bottom width is 4 m.
There is no particular limitation as long as it is m or more, but the depth is 2 to 50 mm.
Is preferable, and more preferably 4 to 25 mm. Further, the width of the bottom surface is preferably 4 to 50 mm, more preferably 5 to 30 mm.

When the concrete members 1 and 1 are connected to each other, the deep grooves 2 and 2 on the joint end faces face each other to form a hole having a relatively large width, and the hole is thermoset as a sealing material. Resin 7 is injected and filled. Then, the thermosetting resin 7 as the sealing material is formed into a relatively thick layer in the direction perpendicular to the joint end face, and thus is easily deformed by the shearing force in the direction parallel to the joint end face. Therefore, even if the joint end surfaces of the concrete members 1 and 1 are displaced due to an earthquake or the like, the thermosetting resin 7 as the sealing material is deformed, so that the sealing material is separated from the concrete member 1, the sealing material is destroyed, and the concrete is It is possible to prevent the peripheral portion of the joint end surface of the member 1 from being broken, and it is possible to improve the reliability of the waterproof performance of the joint portion of the concrete members 1 and 1.

The thermosetting resin 7 as the sealing material preferably has a breaking elongation rate of 20% or more, and more preferably 50% or more, as determined by a tensile test.

The thermosetting resin 7 is produced from a thermosetting resin having reactivity, and includes an epoxy resin, a polyurea resin, a polyurethane resin, an unsaturated polyester resin,
A vinyl ester resin, a silicone resin or the like can be used, and there is no particular limitation, but it is necessary that the shrinkage due to the curing reaction is small, and that it be firmly bonded to concrete,
The viscosity of the undiluted solution at 25 ° C. is 120 Pascal · sec or less, and more preferably 10 Pascal · sec or less, when rotated 120 times at a speed of 60 revolutions per second by a B-type viscometer. On the other hand, in the field, it is necessary to consider important factors such as pouring workability and curing reactivity, as well as concrete water content and the state of water adhesion, and epoxy thermosetting resin that has a wide range of correspondence to these factors is suitable. Is.

The epoxy thermosetting resin comprises an epoxy resin having one or more epoxy groups in one molecule and an epoxy resin curing agent. The epoxy resin includes a bisphenol type epoxy resin having an epoxy equivalent (g / epoxy group: the same applies hereinafter) in the range of 165 to 350, a novolac type epoxy resin having an epoxy equivalent of 170 to 250, a glycidyl ester having an epoxy equivalent of 160 to 350, One or more glycidyl amines having an epoxy equivalent of 100 to 250,
A resin that is liquid at 25 ° C. is preferably used. The epoxy resin also includes a modified epoxy resin obtained by reacting the above epoxy resin with one or more other chemicals. Further, in the epoxy resin, 1 in 1 molecule of glycidyl ether of aliphatic alcohol having an epoxy equivalent of 125 to 2200.
One or more of the above reactive diluents having an epoxy group can be used together for the purpose of adjusting the viscosity of the epoxy resin and imparting flexibility. The epoxy resin curing agent is a chain aliphatic polyamine such as polyethylene polyamine, polyalkylene ether polyamine, polymethylene polyamine or N-.
A room temperature curable curing agent such as a cycloaliphatic polyamine such as aminoethylpiperazine or isophoronediamine, or a fatty aromatic amine such as m-xylenediamine, polyamidoamines or a derivative obtained by reacting one or more other chemicals with the amine, 2 One or more catalysts such as imidazoles such as -ethyl-4-methylimidazole, secondary and tertiary amines such as tetramethylguanidine and triethylenediamine, and boron trifluoride-amine complex are used.

The above-mentioned epoxy thermosetting resin may be an epoxy resin or a material such as thiochol having reactivity with an epoxy resin curing agent for the purpose of modification such as imparting flexibility, or by curing shrinkage of the curing resin. Inorganic or organic particles and other necessary particles can be added for the purpose of stress relaxation.

FIG. 2 shows a second example of the embodiment of the present invention. The same parts as those in the first example are designated by the same reference numerals and the description thereof will be omitted.

The joint end surface of the concrete member 1 is provided with a deep groove 2 arranged at the center and shallow grooves 4 and 4 arranged continuously on both sides of the deep groove 2. Then, the elastic members 9 and 9 are attached to the front and rear gaps (front and rear) formed between the shallow grooves 4, 4, 4 and 4 of the concrete members 1 and 1, and the elastic members 9 and 9 are sandwiched. Then, the concrete members 1 and 1 are connected so as to be compressed, and then the thermosetting resin 7 is injected and filled in the holes formed between the deep grooves 2 and 2.

Therefore, when the thermosetting resin 7 is in an uncured state (undiluted solution), the elastic materials 9 and 9 prevent the thermosetting resin 7 from leaking from the joint surface of the concrete members 1 and 1, and After the cured resin 7 is cured, the synergistic effect of the water blocking by the thermosetting resin 7 and the water blocking by the elastic members 9, 9 causes
The reliability of water stop performance is further improved.

As the above-mentioned elastic material 9, natural rubber, various synthetic rubbers, materials exhibiting rubber-like elasticity such as polyurethane, or materials exhibiting rubber-like elasticity containing closed cells, polyolefins, or the above-mentioned materials. A material in which a water-swellable material is kneaded can be used and is not particularly limited, but an expanded rubber elastic material having closed cells therein which expands when it contains water is preferable.

FIG. 3 shows a third example of the embodiment of the present invention. The same parts as those in the first and second examples are designated by the same reference numerals, and the description thereof will be omitted.

The side surface 3 (the step surface between the shallow grooves 4 and 4) of the deep groove 2 at the joint end surface of the concrete member 1 is previously subjected to a mold release treatment (prior to the filling of the thermosetting resin 7). The thermosetting resin 7 filled in the holes between the deep grooves 2 and 2 of the concrete members 1 and 1 does not adhere to the side surface 3 of each deep groove 2 but only to the bottom surface parallel to the joint end surface.

Therefore, the thermosetting resin 7 is more likely to be deformed in the direction parallel to the joint end face of the concrete member 1, and the thermosetting resin 7 is sufficient even if the joint end faces of the concrete members 1 and 1 are largely displaced. It can be stopped in response to.

The above-mentioned releasing treatment means the thermosetting resin 7
A treatment for adhering a material that does not adhere to or is difficult to adhere to is used, and for example, a method such as application of silicon grease, wax or the like, attachment of craft tape, vinyl tape or the like is used.

[0025]

Next, examples of the present invention will be described together with comparative examples.

(Example 1) A continuous deep groove having a depth of 7.5 mm and a width of 15 mm was provided at the center of a joint end surface of a concrete member, and a continuous shallow groove having a depth of 2 mm and a width of 10 mm was provided on both sides thereof to form a deep groove. Kraft tape with a width of 5.5 mm is continuously applied to the stepped surface between the shallow grooves, and the joint end surface of the other concrete member is treated in the same manner.
An elastic material having closed cells, which was mixed with a water-swellable material having a thickness of 0 mm and a thickness of 10 mm, was attached. Then, the two concrete members are connected by tightening with bolts until the joint end faces of both are in close contact with each other, and one end of the hole formed between the deep grooves of both is plugged, and the other end is put into the hole at 25 ° C. An epoxy thermosetting resin having a mixed viscosity of 500 millipascal-seconds was injected and solidified.

The head of the joint between two concrete members is
As a result of conducting a water permeability test at 000 mm, there was no water leakage and there was no problem at all.

Example 2 Two test pieces (100 mm × 100 mm × thickness 50) cut out from a concrete member.
mm) and a deep groove and a shallow groove are formed on the joint end surface (100 mm × thickness 50 mm), and an elastic material is attached to the joint end surface (100 mm × thickness 50 mm). Resin was injected and solidified.

One test piece is fixed on the table with the joint part as a boundary, and a compressive load in the thickness direction (parallel to the joint end surface) is applied to the other test piece at a constant speed to cause a maximum displacement of 5 mm on the joint end surface. It happened. As a result, there were no abnormalities such as cracking of the base concrete (test piece) or the sealant (thermosetting resin), and peeling of the sealant from the base concrete.

Comparative Example Two test pieces (100 mm × 100 mm × thickness 50 m) cut out from a concrete member.
m) is bonded to the joint end surface (100 mm × thickness 50 mm) without forming a groove, and an elastic material having a width of 10 mm and a thickness of 2 mm is attached to form a gap of 15 mm in width and 1 mm in thickness, and both test pieces are attached. Tightened with bolts and connected. Then, one end of the gap was plugged and the same thermosetting resin as in Example 1 was injected and solidified.

As a result of applying a shift to the joint end faces in the same manner as in Example 2, the base concrete around the thermosetting resin broke with a shift of 0.5 mm.

Table 1 shows the physical properties of the epoxy thermosetting resin,
The items and results of the test performed using the test pieces obtained by cutting out a part of the concrete member are shown. The test method is as follows.

Tensile Strength (JIS K 7113) Tensile Breaking Elongation Rate (JIS K 7113) Tensile Breaking Elongation Retention Rate Distilled Water Immersion 30 Days Water Permeability Test (1) Water Head 2m Bonded Surface (JIS A 6910 Semi-Adapted) Water Permeability Test (2) Water head 2m Non-bonded surface (JIS A 6910 standard) Adhesion test (1) (JIS A 6910 standard) Adhesion test (2) Wet condition 30 days (JIS A 6910 standard)

[0034]

[0035]

As described above, in the method for sealing the joint portion of the concrete members according to the present invention, the grooves are provided in the joint surfaces of the two concrete members to be joined so as to face each other, and the concrete members are joined together. By filling the holes formed between the grooves of the joint surface with the thermosetting resin, the thermosetting resin as the sealing material becomes a layer that is relatively thick and easily deformed, and adheres to both concrete members. Therefore, even if the joint surfaces of both concrete members are displaced due to seismic force, the thermosetting resin as the seal material is deformed, causing the seal material to separate from the concrete member and the peripheral portion of the joint surface of the concrete member to be destroyed. It is possible to prevent such problems and improve the reliability of the water stopping performance of the joint portion of the concrete member.

In addition, on the joint surface of two concrete members to be connected, a deep groove arranged at the center and a shallow groove continuous in steps are provided on both sides thereof, and by connecting both concrete members, a space between the shallow grooves is formed. The elastic material is attached in a compressed form in the pair of front and rear gaps formed in the, and the thermosetting resin (stock solution) in an uncured state is filled by filling the holes formed between the deep grooves with the thermosetting resin. Leakage from the joint surface can be prevented, and due to the synergistic effect of the water stop by the elastic material and the water stop by the thermosetting resin, the water stop performance reliability of the joint portion of the concrete member can be further improved.

Further, by subjecting the side surface of the groove of the joint surface of the concrete member to mold release treatment, the thermosetting resin filled in the holes between the deep grooves of both concrete members adheres to both concrete members only at the bottom surface of the deep groove. The thermosetting resin as the sealing material is more likely to be deformed, and water can be stopped even if the joint surfaces of both concrete members are largely displaced.

The elongation at break according to the tensile test is 20.
% Or more, and by using a thermosetting resin having reactivity, it is possible to suitably cope with the deviation of the joint surface of the concrete member.

Further, in the case of constructing a concrete structure such as a tunnel, a water tank, a floor slab, a basement wall, a basement, etc. by connecting plate-like concrete members, the water stoppage of the structure,
The reliability of waterproof performance can be improved.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a horizontal sectional view showing a second example of the embodiment of the present invention.

FIG. 3 is a third example of the embodiment of the present invention and is a horizontal cross-sectional view showing a state in which a joint surface of a concrete member is displaced.

[Explanation of symbols]

 1 Concrete Member 2 Deep Groove 3 Side (Deep Groove) 4 Shallow Groove 7 Thermosetting Resin (Seal Material) 9 Elastic Material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takanori Takumoto 2-1-1 Nishishinjuku, Shinjuku-ku, Tokyo Mitsui Home Co., Ltd. (72) Takao Iwasaki 5-33-11 Shinbashi, Minato-ku, Tokyo Issue Japan Hume Tube Co., Ltd. (72) Inventor Hiroshi Iizuka 3 Chikusaigan, Ichihara-shi, Chiba Mitsui Petrochemical Industry Co., Ltd. Chiba factory

Claims (5)

[Claims] 1. A groove is provided in the joint surfaces of the concrete members to be connected so as to face each other, and a thermosetting resin is filled in the holes formed between the grooves by the connection of the concrete members. Sealing method for joints of concrete members. 2. The groove on the joint surface of the concrete member is composed of a deep groove arranged at the center and shallow grooves continuous in steps on both sides thereof, and is formed between the shallow grooves by connecting the concrete members. The method for sealing a joint portion of a concrete member according to claim 1, wherein an elastic material is mounted in a compressed form in a pair of front and rear gaps, and a thermosetting resin is filled in a hole formed between the deep grooves. 3. The method for sealing a joint portion of a concrete member according to claim 1, wherein the side surface of the groove of the joint surface of the concrete member is subjected to a mold release treatment. 4. The thermosetting resin filled in the groove of the joint surface has a breaking elongation of 20% or more as determined by a tensile test and is made of a reactive thermosetting resin. Method for sealing the joints of concrete members. 5. The concrete member is formed into a plate shape,
The method for sealing a joint portion of a concrete member according to any one of claims 1 to 4, wherein a concrete structure is configured by connecting a plurality of pieces.