JP2002054165A - Joining method for concrete structure, joining body, and built-up manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining method for a concrete structure excellent in watertightness and earthquake resistance. SOLUTION: In the joining method for the concrete structure, a closed-cell elastic body 12 is disposed between the concrete structures 2 and 5, such as a built-up manhole, to be joined and bonded for joining through a room temperature setting adhesive 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a concrete structure, a joined body and an assembling manhole, and more particularly to an assembling manhole made of concrete provided in the middle of a pipe buried underground, and joining other concrete structures. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a joined concrete structure, and more particularly to a joining method, a joined body and an assembling manhole of a concrete structure in which watertightness and seismic resistance of a joint are improved and workability is enhanced.

[0002]

2. Description of the Related Art FIG. 7 is a schematic sectional view showing an example of a conventional assembly manhole, and FIG. 8 is a partial perspective view thereof. In FIG. 1, an annular pipe mounting wall 2 is installed above a bottom plate 1, and an inflow pipe 3 for inflowing water and an outflow pipe 4 for discharging water are connected to the pipe mounting wall 2. A straight wall 5 above the pipe mounting wall 2
Is installed, and a slope wall 6 is installed on the straight wall 5.
A manhole receiving frame 8 is provided on the upper surface of the manhole via an adjustment ring 7. A manhole cover 9 is mounted on the inner surface of the assembled manhole. A step 10 is provided inside the assembly manhole.

Each of the pipe mounting wall 2, the straight wall 5, and the inclined wall 6 is formed of a concrete annular body. As shown in FIG. 8 (b), an open-cell sponge 11 impregnated with an epoxy resin is placed between them, and the upper annular body is placed on the lower annular body so as to crush the sponge 11. When fitted, the upper and lower annular members are firmly bonded and joined by curing the epoxy resin (Japanese Patent Publication No. 47-47).
702).

As another joint structure, there has been proposed a method using seismic isolation rubber as a joint material between annular bodies (Japanese Patent Laid-Open No. Hei 10-259616).

[0005]

Among the conventional manhole assembling methods, a method of joining members with a joined body obtained by impregnating a fluid adhesive such as an epoxy resin into an open-celled elastic sponge is described in Japanese Patent Application Laid-Open No. H11-279,086. Is a rigid body, and the initial adhesiveness and water-stopping properties are sufficient, but when an external force such as an earthquake acts, the water-stopping property may be impaired because the adhesive layer or the manhole member at the adhesive portion is easily broken. .

Further, the method of using seismic isolation rubber as a joint material between annular bodies as a joint structure requires a joint material having a complicated seismic isolation structure and is costly. There is a problem in water stoppage due to poor ability to follow the surface.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems of the prior art, and has as its object to provide a method for joining concrete structures having excellent watertightness and earthquake resistance. is there. It is another object of the present invention to provide a structural joint and an assembly manhole formed by joining concrete structures, which are excellent in watertightness and earthquake resistance.

[0008]

That is, the present invention is characterized in that a closed-cell elastic body is disposed between concrete structures to be joined, and is bonded and joined via a room-temperature-curable adhesive. This is a method for joining structures.

It is preferable that the closed-cell elastic body is disposed at least in a part between concrete structures to be joined. It is preferable that the room temperature-curable adhesive is disposed at least on the contact surface between the closed-cell elastic body and the concrete structure.

[0010] It is preferable that after the room-temperature-curable adhesive is arranged at least on the contact surface between the closed-cell elastic body and the concrete structure, the closed-cell elastic body is crushed by pressing the concrete structure and bonded. It is preferable that the closed-cell elastic body has a liquid-permeable structure on the bottom surface.
Tensile modulus after curing of the room temperature curing adhesive is 0.05
The pressure is preferably up to 800 MPa.

[0011] The present invention is also a joined structure obtained by joining concrete structures by the above method. further,
The present invention is an assembling manhole having a structural portion obtained by joining concrete structures by the above method.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The present invention provides a method for joining a concrete structure, comprising disposing a closed-cell elastic body at least at a joint part of an assembling manhole or another concrete structure, and bonding the same with a room-temperature curing adhesive. The present invention also relates to an assembly manhole having a structure joined by the joining method, and a structure joined body joined by the joining method.

[0013] The concrete structure in the present invention is:
1 shows an assembly manhole made of precast concrete, another concrete product, a block structure, or the like provided in the middle of a pipeline buried underground.

[0014] The jointed concrete structure joined by the method of the present invention is excellent in waterproofness and seismic resistance because the joined portion is made of a closed-cell elastic body via a room-temperature-curable adhesive.

[0015] In addition, since at least a part of the concrete structure to be joined is bonded and joined with a closed-cell elastic body via a room-temperature-curable adhesive, the concrete structure is excellent in waterproofness and earthquake resistance. By providing a portion directly bonded by using a room temperature-curable adhesive, it is possible to further increase the resistance to external pressure load, shear load and bending load. Furthermore, by using a room temperature curing type adhesive, stable adhesiveness to concrete can be obtained, and joining at a low temperature in winter can be performed in a short time with good workability.

In the method for joining concrete structures according to the present invention, a closed-cell elastic body is arranged between concrete structures to be joined, and is joined with a room-temperature-curable adhesive. The closed-cell elastic body is preferably arranged at least in part between the concrete structures to be joined, and the room-temperature-curable adhesive is preferably arranged at least on the contact surface between the closed-cell elastic body and the concrete structure. .

The joint surfaces of the concrete structures A and B bonded and bonded are as follows: (1) Structure A / room temperature curing type adhesive / closed cell elastic body / room temperature curing type adhesive / structure B (2) ) Structure A / room-temperature-curable adhesive / structure B (3) The structure A / structure B is joined. It is necessary that the joint surface of the concrete structure has the joint (1). Yes, specifically,
(1) bonding, (1) + (2) bonding, (1) + (2)
+ (3) bonding surface.

FIG. 1 is a schematic view showing a structure of a joint portion of an assembling manhole according to an embodiment of a method for joining concrete structures of the present invention, and FIGS. 1 (a) to 1 (c) show a joint structure. FIG. 1D is an exploded perspective view showing a joint structure.

The tube mounting wall 2 and the straight wall 5 used in the embodiment of FIG. 1 are annular bodies as in FIG. 7, and the closed-cell elastic body 12 and the adhesive 13 are annularly formed on the tube mounting wall 2. Is provided.

In the embodiment shown in FIG. 1, a concave groove 23 is provided on the upper end surface of the tube mounting wall 2, and a convex groove 24 is provided on the lower end surface of the straight wall 5. FIG. 1B shows an adhesive 13 attached to a closed-cell elastic body 12 arranged on the entire joint surface of the concrete structure in a shape conforming to the shape of the uneven groove.
Is shown. The adhesive 13 is also provided in the concave groove 23 of the tube mounting wall 2. The structure of such a concave-convex groove is such that the closed cell elastic body
2 is preferably held uniformly over the entire circumference of the annular body, and the closed-cell elastic body 12 and the adhesive 13 are preferably uniformly spread and adhered at the time of joining. After the closed-cell elastic body and the adhesive are arranged on the entire surface including the concave and convex grooves on the contact surface of the concrete structure, the closed-cell elastic body is crushed by the pressing of the concrete structure to be bonded and bonded. As shown in FIG.
The entire joint surface of the cemented concrete structure is
The surface of the closed-cell elastic body is covered with an adhesive and joined.

FIG. 2 is a schematic view showing a structure of a joint portion of an assembling manhole according to another embodiment of the method for joining concrete structures of the present invention, and FIGS. 2 (a) to 2 (c) show the joint structure. FIG. 2D is an exploded perspective view showing the joint structure.

In the embodiment shown in FIG. 2, the closed-cell elastic body 12 has a shape conforming to the shape of the concave-convex groove having an arc-shaped cross section and is disposed in the concave-convex groove portion on the joint surface of the concrete structure. Shows an example in which the adhesive 13 is disposed. Similar to FIG. 1, after the closed-cell elastic body and the adhesive are arranged in the concave and convex grooves on the contact surface of the concrete structure, the closed-cell elastic body is crushed by the pressing of the concrete structure to be bonded and bonded. As shown in FIG. 2 (d), the bonding surface of the adhesively bonded concrete structure is such that part of the adhesive covers the surface of the closed-cell elastic body, and the other part of the adhesive is connected to the concrete structure. They are joined in direct contact.

The structure of the concave and convex grooves of the pipe mounting wall 2 and the straight wall 5 is such that the adhesive 13 which has been spread out at the time of joining is formed by the concave grooves 2.
It is preferable that a gap 17 is formed in the outer peripheral side 15 at the time of joining so as to escape from the direction 3 to the outer peripheral side 15.

FIG. 3 is a schematic view showing a structure of a joint portion of an assembling manhole according to another embodiment of the concrete structure joining method of the present invention, and FIGS. 3 (a) to 3 (c) show the joint structure. FIG. 3D is an exploded perspective view showing the joint structure.

In the embodiment shown in FIG. 3, the closed-cell elastic body 12 has a shape conforming to the shape of the uneven groove having a rectangular cross section and is arranged in the uneven groove portion on the joint surface of the concrete structure. An example using an adhesive 13 will be described. Otherwise, it is the same as FIG.

The embodiment shown in FIG. 4 shows a pipe mounting wall 2 and a straight wall 5.
In this structure, a step 18 is provided between the inner peripheral side 16 and the outer peripheral side 15 on the joining surface of the. The closed-cell elastic body 12 and the adhesive 13 are uniformly held at the position of the step 18 over the entire circumference of the annular body, so that the closed-cell elastic body 12 and the adhesive 1
3 is spread uniformly and adhered.

The embodiment of FIGS. 5 and 6 shows a method of joining a concrete structure using a closed-cell elastic body 12 having a liquid passing structure 14 on the bottom surface. By providing the liquid passage structure 14 on the bottom surface of the closed-cell elastic body 12, the adhesive 13 only needs to be provided on the closed-cell elastic body 12,
The adhesive 13 spread out at the time of joining passes through the liquid passage structure portion 14 and moves to the concave groove 23 of the tube mounting wall 2 on the bottom surface, so that the whole can be uniformly adhered and the work is facilitated.

As the room temperature curing adhesive, an adhesive which cures without heating is used, for example, epoxy resin, urethane resin, silicone resin, sulfide resin, vinyl ester resin, unsaturated polyester resin, (meth) acrylic resin Although it is possible to use, etc., low-temperature curability, wet surface adhesion, fast-curing excellent radical curable resin, that is, vinyl ester resin, unsaturated polyester resin,
(Meth) acrylic resin and the like are preferable.

The tensile modulus of the room temperature curable adhesive after curing is not particularly limited, but an adhesive having a low elastic modulus of 0.05 to 800 MPa, preferably 0.05 to 20 MPa is preferable because it is particularly excellent in water stoppage. .

The porosity of the closed-cell elastic body is desirably 10% or more, preferably 10 to 90%. When the porosity is less than 10%, the surface followability when crushed at the time of joining is poor, and the water stopping performance is poor. Become.

The closed cell elastic body preferably has a substantially seamless annular structure like the concrete structure to be joined. The adhesive is applied to the bottom only by applying a room temperature curing type adhesive from the top. It is particularly preferable to have a liquid passing structure at the bottom so that it can rotate. In addition, a fastener can be used in combination with the method and the body for joining a concrete structure according to the present invention. By joining concrete structures by the above joining method of the present invention, a joined structure can be obtained. In addition, an assembly manhole can be obtained by joining the structural portions of the concrete structure of the assembly manhole by the above joining method of the present invention.

[0032]

EXAMPLES The present invention will be specifically described below with reference to examples. Example 1 As a test body, a No. 1 manhole straight wall having a height of 180 cm and having a groove having an uneven structure shown in FIG. 1 at an end was used. A test piece using the closed-cell elastic body 12 was assembled as follows.

That is, the lower straight wall (corresponding to the pipe mounting wall in FIG. 1) is placed horizontally, and a room-temperature-curable acrylic resin adhesive (cured physical property: tensile strength of 20 M) is formed around the concave groove at the upper end.
After applying Pa and a tensile modulus of elasticity of 500 MPa), an annular elastic body made of a closed-cell foamed polyethylene having a porosity of 80% and having the shape of the closed-cell elastic body 12 shown in FIG. Room-temperature-curable acrylic resin adhesive (cured physical properties: tensile fracture strength 2)
0 MPa and a tensile modulus of elasticity of 500 MPa) were applied, and an upper straight wall was placed. The closed cell elasticity was crushed by the weight of the upper straight wall, and at the same time, the upper straight wall and the lower straight wall were joined by the adhesive spread uniformly.

Example 2 A test piece was prepared in the same manner as in Example 1 except that the closed-cell elastic body 12 shown in FIG. 2 was used.

Example 3 A test piece using the closed-cell elastic body 12 was assembled as follows. That is, the lower straight wall is placed horizontally, and an annular elastic body made of closed-cell foamed polyethylene having a porosity of 80% and having the shape of the closed-cell elastic body 12 shown in FIG. Room temperature-curable acrylic resin adhesive (cured physical properties: tensile strength at break: 20 MPa, tensile modulus: 500 MPa) was applied to the entire circumference from the upper part of the elastic elastic body, and overflowed from the concave groove on the upper part of the closed cell elastic body. The adhesive was naturally filled also in the lower liquid passage structure 14. Thereafter, the upper straight wall was placed, and the closed-cell annular elasticity was crushed by the weight of the upper straight wall, and at the same time, the upper straight wall and the lower straight wall were joined by the adhesive spread uniformly.

Example 4 A joined specimen was prepared in the same manner as in Example 3 except that a room-temperature-curable acrylic resin adhesive having a tensile modulus of elasticity of 20 MPa (cured physical property: tensile breaking strength of 5 MPa) was used.

Example 5 A test piece joined in the same manner as in Example 3 except that a room-temperature-curable acrylic resin adhesive having a tensile modulus of elasticity of 0.05 MPa (cured physical property: tensile breaking strength 1 MPa) was used. did.

COMPARATIVE EXAMPLE 1 A lower straight wall was placed horizontally, and an open-cell sponge with a porosity of 80% having the same shape as that of FIG. Physical properties: A joint impregnated with a tensile fracture strength of 20 MPa and a tensile modulus of elasticity of 500 MPa) was placed thereon, an upper straight wall was placed thereon, and the upper straight wall and the lower straight wall were joined.

In order to examine the seismic resistance of the assembled test pieces of the above Examples and Comparative Examples, the test pieces were attached to a universal testing machine, and 28 KN in the horizontal direction while applying an axial force of 10 KN vertically to the straight wall. The bending load was repeatedly applied 5 times, and the opening amount of the joint was measured with a strain gauge.

For the measurement of water stoppage, a bottom plate was attached to the bottom of the test piece after measuring the aperture of the joint, water was poured into the test piece, and the presence or absence of water leakage from the joint for up to 30 days was observed. From the results, it was determined that the water stoppage was maintained when there was no water leakage, and that the water stoppage was impaired when there was water leakage.

The tensile strength at break and tensile modulus of the cured adhesive were measured on a No. 2 type test piece according to JIS K7113 “Plastic tensile test method”. Table 1 shows the results of these tests.

[0042]

[Table 1]

[0043]

As described above, according to the method for joining concrete structures of the present invention, concrete structures having excellent watertightness and earthquake resistance can be joined.
Moreover, the concrete structure joint body and the assembled manhole of the present invention have an effect of being excellent in watertightness and earthquake resistance.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a configuration of a joint portion of an assembling manhole according to an embodiment of a method for joining concrete structures of the present invention.

FIG. 2 is a schematic view showing a configuration of a joint portion of an assembly manhole according to another embodiment of the concrete structure joining method of the present invention.

FIG. 3 is a schematic view showing a configuration of a joint portion of an assembly manhole according to another embodiment of the method for joining concrete structures of the present invention.

FIG. 4 is a schematic view showing a configuration of a joint portion of an assembly manhole according to another embodiment of the method for joining concrete structures of the present invention.

FIG. 5 is a schematic view showing a configuration of a joint portion of an assembly manhole according to another embodiment of the method for joining concrete structures of the present invention.

FIG. 6 is a schematic view showing a configuration of a joint part of an assembly manhole according to another embodiment of the method for joining concrete structures of the present invention.

FIG. 7 is a schematic sectional view showing an example of a conventional assembly manhole.

FIG. 8 is a partial perspective view showing the conventional assembly manhole of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom plate 2 Pipe mounting wall 3 Inflow pipe 4 Outflow pipe 5 Straight wall 6 Sloping wall 7 Adjustment ring 8 Manhole receiving frame 9 Manhole cover 10 Step 11 Open-celled sponge impregnated with epoxy resin 12 Closed-cell elastic body 13 Adhesive 14 Liquid structure portion 15 Outer side 16 Inner side 17 Gap 18 Step 23 Concave groove 24 Convex groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masami Suzuki 485, Sakado, Okamachi, Minamiuonuma-gun, Niigata Prefecture Inside Shinwa Concrete Industry Co., Ltd. Address: Shinwa Concrete Industry Co., Ltd. (72) Inventor Toshihiro Ando 3-5-1 Asahicho, Machida-shi, Tokyo Denka Kagaku Kogyo Co., Ltd. (72) Inventor Tatsuo Nakano 3 Asahicho, Machida-shi, Tokyo No.5-1, Denki Kagaku Kogyo Co., Ltd. Central Research Laboratory (72) Inventor Aki Tomozawa 3-5-1 Asahimachi, Machida-shi, Tokyo Denki Kagaku Kogyo Co., Ltd. Central Research Laboratory F-term (reference) 2D047 BA21 2D063 DA20 4J040 EC001 LA07 MA06 MB06 NA12 PA19 PA33

Claims (8)

[Claims] 1. A method for joining concrete structures, comprising disposing a closed-cell elastic body between concrete structures to be joined and bonding them together with a room-temperature curing adhesive. 2. The method for joining concrete structures according to claim 1, wherein said closed-cell elastic body is arranged at least in part between concrete structures to be joined. 3. The method for joining concrete structures according to claim 1, wherein the room temperature curing adhesive is arranged at least on a contact surface between the closed-cell elastic body and the concrete structure. 4. The method according to claim 1, wherein the room-temperature-curable adhesive is disposed on at least a contact surface between the closed-cell elastic body and the concrete structure, and then the closed-cell elastic body is crushed by the pressing of the concrete structure to be bonded and joined. 4. The method for joining concrete structures according to any one of Items 3 to 3. 5. The method for joining concrete structures according to claim 1, wherein the closed-cell elastic body has a liquid-permeable structure on a bottom surface. 6. The tensile modulus of the room temperature-curable adhesive after curing is 0.05 to 800 MPa.
3. The method for joining concrete structures according to item 1. 7. A structure joined body obtained by joining concrete structures by the method according to claim 1. Description: 8. An assembly manhole having a structural part obtained by joining concrete structures by the method according to claim 1.