JP2017106237A - Joint structure of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly form a joint 3 sealed for inducing its crack, in a wall handrail 2.SOLUTION: A backup material 11 is provided on the innermost side of a joint 3, and a caulking material 20 is filled in a surface of its backup material, and a joint material 30 (a sealed joint 3) is constituted. Its joint forming chamfer strip A is constituted of an auxiliary material 12 of the same shape as a part for filling the caulking material 20 and the backup material 11, and has an adhesive layer 13a for bonding the auxiliary material 12 on a surface of its backup material 11, and its adhesive layer 13a is constituted so as to exist on its backup material 11 side even if the auxiliary material 12 is torn off from the backup material 11. Concrete is placed by providing this chamfer strip A in a form, and after hardening the concrete, the form is removed by leaving the chamfer strip A in the concrete, and after tearing off the auxiliary material 12 from the backup material 11, the joint material 30 is formed by filling the caulking material 20 on the surface of its backup material 11.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a joint structure of a concrete structure (including a reinforced concrete structure), a method for forming the joint structure, and a joint material wood for use in the formation.

In joints and civil engineering structures, joints are gaps or joints between members that are slightly spaced apart, and joints are provided (filled) to absorb the expansion and contraction of the structure. Thus, it serves to prevent the entire deterioration.
For example, the wall rails installed on automobile roads and high-speed railways are the specifications of the Ministry of Land, Infrastructure, Transport and Tourism, etc., with a V cut groove with a depth of 30 mm as a shrink joint at one place for extension (length direction) 10 m (Refer to reference numeral 3 (30) in FIG. 1). The V-cut groove-shaped joint 3 having a V-cut groove concentrates stress on the wall rail due to a temperature change or the like to cause cracks, thereby preventing deterioration of the entire wall rail (see Patent Document 1, Abstract, FIG. 1).
Conventionally, no padding has been applied to the V-cut joint 3, but sealing has been achieved from the viewpoint of waterproofness and the like. The sealing is performed by filling the V-cut joint with a caulking material such as modified silicone.

JP 2013-227722 A JP 2013-2227 A

Since the sealing in the wall height column is filled with the caulking material in the V-cut joint 3 in the vertical direction, the caulking material hangs down and is not smoothly filled in the V-cut joint 3, and the workability is poor. In addition, caulking materials such as modified silicone are expensive and costly, so there is a problem in cost.
By the way, in the construction field, there is a technique in which a backup material is packed in a joint and a sealing material is loaded on the surface thereof (see Patent Document 2, Abstract, FIG. 1). However, even in this technique, when the joint is in the vertical direction, there is a problem that the sealing material drips and the filling is not smooth.

  This invention makes it a subject to set it as the joint structure etc. with which workability | operativity is good and cheap under the above actual condition.

In order to achieve the above object, according to the present invention, an adhesive layer of a caulking material serving as a sealing material is provided on the surface of the backup material.
When the adhesive layer is provided in this way, when the caulking material is provided on the surface of the backup material provided in the joint such as the V-cut groove and filled in the joint, the caulking material is adhered and fixed by the adhesive layer. Therefore, sagging is suppressed as much as possible. For this reason, smooth filling can be performed and workability is high.

As a specific configuration of the joint structure according to the present invention, a back-up material is provided in the back of the joint, the surface of the back-up material is filled with a caulking material, and the back-up material and the caulking material constitute the joint material. A configuration in which an adhesive layer for adhering the caulking material is formed on the surface of the backup material can be adopted.
The joint structure having this configuration can be adopted in a building or a civil engineering structure, and in the latter case, it can be adopted as a joint for inducing the crack of the wall rail.

The joint structure of each of the above configurations is formed in the same manner as in the prior art by first placing a joint rod (face wood) on a mold and placing concrete, then removing the mold after the concrete is hardened. Then, the joint rod can be removed to form a joint, a backup material can be provided behind the joint, and the surface of the backup material can be filled with the caulking material. At this time, an adhesive layer is formed by applying an adhesive on the surface of the backup material or applying a double-sided tape. Further, for example, the backup material and an auxiliary material that is bonded to the surface of the backup material via an adhesive layer and has the same shape as the portion filled with the caulking material, the backup material side of the adhesive layer Adhesive strength can be determined by providing the face wood on the mold and placing concrete into the joint material, if the auxiliary material is peeled off from the backup material and the adhesive layer is located on the backup material side. If set up, this face wood is left in the concrete and demolded. After the auxiliary material is peeled off from the backup material, the surface of the backup material is filled with the caulking material to form the joint material (joint structure). Can be.
Similarly, this forming method can be adopted in buildings and civil engineering structures, and in the latter case, it can be adopted as joints for inducing cracks in wall rails.

  Since the present invention is configured as described above, the workability is good and the joint can be inexpensive.

The principal part cutting perspective view of one Embodiment of the joint material jointing wood which concerns on this invention Sectional view taken along line II in FIG. Partial perspective view for explaining the operation of the embodiment The joint material combined use face wood of the same embodiment is shown, (a) is a principal part perspective view, (b) is an exploded principal part perspective view, and (c) is a top view. Cutaway cross-sectional view of other embodiments

  The joint structure according to the present invention is adopted in a wall rail of an automobile-only elevated road, and this road is constructed with a concrete wall rail 2 on both sides of a concrete foundation floor slab 1, as in the prior art, This is adopted in the joint 3 for inducing cracks in the wall rail 2. One joint 3 is provided at an extension (length direction) interval of 10 m.

As shown in FIG. 4, a face tree (joint bar) A for forming the joint 3 has a right-angled isosceles triangle having a base a: 60 mm and a height h: 30 mm as shown in FIG. )) And foamed polyethylene (PE). The face wood A is composed of a member to be the backup material 11 and a member to be the auxiliary material 12 peeled off from the member 11, and both the members 11 and 12 are bonded by a double-sided tape 13 to constitute the face wood A. Yes. A double-sided tape 15 with a release paper 14 is also attached to the bottom surface (surface gap) of the face wood A in plan view. The height h ₁ of the auxiliary material 12 is arbitrary, for example, 7 to 10 mm, and in this embodiment, h ₁ = 10 mm.

  A primary treatment is applied to the backup material 11 side of the double-sided tape 13 between the backup material 11 and the auxiliary material 12 to increase the adhesive strength on the backup material 11 side. For this reason, when both members 11 and 12 are peeled off from the state where both members 11 and 12 in FIG. 4A are joined, as shown in FIG. 4B, the double-sided tape 13 is moved to the backup material 11 side. The adhesive layer 13a is formed on the remaining surface.

  In order to construct the joint 3 of the wall height column 2 shown in FIG. 1 and FIG. 2 with this face wood A, after the foundation floor slab 1 is constructed, a construction form for the wall height column 2 (not shown) ), And the release paper 14 of the face wood A is peeled off from the mold part corresponding to the place where the joint 3 is formed (see FIG. 4B), and the face wood A with an adhesive layer made of the double-sided tape 15 is peeled off. To fix.

In this state, concrete is placed in the mold to form the wall height column 2 shown in FIG. After the concrete is hardened, it is demolded, and the auxiliary material 12 of the face wood A is peeled off (removed), and the upper and lower ends of the backup material 11 exposed from the auxiliary material 12 are cut out to a required length ( (See FIG. 3A to FIG. 3B). When the mold is removed, the auxiliary material 12 may be peeled off via the double-sided tape 15 together with the mold.
The space S from which the auxiliary material 12 has been peeled off is filled with a modified silicone caulking material 20 as shown in FIG. At this time, since the adhesive layer 13a is formed on the surface of the backup material 11 by the double-sided tape 13, it is suppressed that the caulking material 20 is captured and drooped by the backup material 11 by the adhesive layer 13a. For this reason, the joint 3 can be sealed with the caulking material 20 without requiring skill.

  The construction unit price per meter when the joint 3 filled with the joint material 30 of the wall rail 2 is formed by the face wood A of this embodiment is about 3500 yen / m, whereas the conventional face wood is used. When the V-cut groove was formed and the joint 3 was formed by filling the V-cut groove with the modified silicone caulking material 20, the cost was 5000 yen / m, which was a significant cost reduction.

  The cross-sectional shape of the face tree A is not limited to the above-described triangle, but is arbitrary such as a quadrangle. For example, as shown in FIGS. 5A to 5C, the auxiliary material 12 has a trapezoidal shape, and the backup material 11 has a quadrilateral shape having the upper side of the trapezoid as one side (FIG. 5A). The trapezoidal and backup material 11 is a triangle (part (b) in the figure) with a part of the upper side of the trapezoid as one side, or the auxiliary material 12 is a trapezoid with the trapezoidal shape and the backup material 11 has a lower part of the upper side of the trapezoid (C)), etc., etc., and any cross-sectional shape / size / dimension capable of forming the joint 3 are arbitrary. At this time, it is needless to say that the release paper 14 can be provided on the surface of the auxiliary material 12 via the adhesive layer 15.

In the above embodiment, the material of the face wood A can be a resin other than foamed polyethylene (PE), wood or the like, and the adhesive layer 13a is also formed by other than the double-sided tape 13 such as application of adhesive. Of course you can. Furthermore, the present invention can be used not only for the above-mentioned wall rail 2 but also for other concrete civil engineering structures and also for concrete buildings such as various buildings.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

A Joint material and joint wood (joint stick)
1 Floor slab 2 Wall height column 3 Joint 11 Back wood back-up material (one member)
12 Auxiliary material (the other member)
13 Double-sided tape 13a Adhesive layer 14 Release paper 15 Double-sided tape (adhesive layer)
20 Caulking material 30 Joint material

Claims (5)

A back-up material (11) is provided in the back of the joint (3), the surface of the back-up material (11) is filled with a caulking material (20), and the back-up material (11) and the caulking material (20) are jointed. The joint material wood (A) for constituting the material (30),
The backup material (11), and an auxiliary material (12) having the same shape as the portion filled with the caulking material (20) bonded to the surface of the backup material (11) via an adhesive layer (13a) The adhesive strength on the backup material (11) side of the adhesive layer (13a) is such that even if the auxiliary material (12) is peeled off from the backup material (11), the adhesive layer (13a) is still on the backup material (11) side. The jointing wood for joint material that is designed to be located.   A back-up material (11) is provided in the back of the joint (3), the surface of the back-up material (11) is filled with a caulking material (20), and the back-up material (11) and the caulking material (20) are jointed. A joint structure in which a material (30) is formed, and an adhesive layer (13a) for adhering the caulking material (20) is formed on the surface of the backup material (11).   3. Joint structure according to claim 2, wherein the joint (3) is for inducing cracks in the wall rail (2).   The joint material face wood (A) according to claim 1 is provided in a mold, concrete is placed in the mold, and after the concrete is hardened, the mold is removed, and the auxiliary material (12) is The method for forming joints according to claim 2 or 3, wherein after peeling off from the backup material (11), the surface of the backup material (11) is filled with the caulking material (20).   The method for forming joints according to claim 4, wherein the joints (3) are for inducing cracks in the wall rails (2).

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