JP2006200173A - Water-stopping mechanism and water-stopping member for joint parts of concrete structures - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water stop mechanism for a joint part of a concrete structure which is superior in water stop performance compared to conventional water stop mechanisms, is easy to construct and can be reliably constructed, and has an earthquake resistant slit. To provide a water stop mechanism with excellent water stop performance that does not depend on construction accuracy, and can be used in a wide range of construction sites without the risk of cross-sectional defects in the beam part in the concrete joint part using materials, And a water stop member that is simple in structure and can be supplied at low cost.
SOLUTION: A water stop structure of a joint portion when a post-cast concrete 19 is placed on the pre-cast concrete 17 after the pre-cast concrete 17 is cast and the concrete is handed over. A water-stopping member 1 provided with a waterproof layer 3 made of a material having waterproofness and elasticity capable of being in close contact with concrete in the longitudinal direction of the surface of the plate-like member 2 having rigidity. In the state where a part of the waterproof layer 3 is embedded in the pre-cast concrete 17 so that the short direction is the vertical direction and the longitudinal direction of the water-stopping member 1 is the horizontal direction of the concrete structure, the post-cast concrete 19 is I cast it.
[Selection] Figure 7

Description

  The present invention is a concrete structure in which a water-stopping mechanism for a concrete joint portion when a post-cast concrete is continuously placed on a pre-cast concrete, a reinforced concrete structure, and a steel reinforced concrete structure is seismic resistant in a concrete wall. By embedding slit material and cutting the edge of the column and wall, it is possible to prevent the shear failure of the column in the event of a large earthquake and to stop the concrete joint using the earthquake-resistant slit material for the purpose of preventing the building from collapsing. The present invention relates to a water mechanism and a water stop member used for the water stop mechanism.

  Conventionally, as a water-stopping mechanism for the joint portion of a concrete structure, when post-cast concrete is placed continuously to the pre-cast concrete, the non-vulcanized adhesive has been applied to the joint portion at the upper end of the pre-cast concrete. There is a known structure in which a water-stopping member made of a long body made of butyl rubber is disposed, post-cast concrete is placed, and water is stopped by the water-stopping member (see Patent Document 1).

  In the construction method of the water stop mechanism, a groove having a predetermined depth and width is formed in the upper end of the pre-cast concrete after the concrete is dried or freshly dried. The members are placed and fixed, and post-cast concrete is placed. Further, the water-stop member is a strip-shaped main body made of non-vulcanized butyl rubber and having a horizontally long cross section, and a skin made of polyvinyl alcohol that covers the upper end surface and both side surfaces of the main body, and is peeled off during use. It has paper.

  Among the methods for imparting seismic performance to buildings made of reinforced concrete or steel-framed reinforced concrete, the seismic slit method is known. The seismic slit method is usually divided into vertical slit material that is installed vertically to cut the edges of walls and columns, and horizontal slit material that is installed horizontally to cut edges of beams and walls. It is often constructed by a three-sided full-slit type suspension method in which the edge is suspended from the upper beam and the edges are cut from the left and right columns and the lower beam with a slit material having a product width equivalent to the wall thickness. The earthquake-resistant slit material is often installed on the outer wall for the purpose of use, and in this case, the performance is required so that rainwater does not enter the interior due to rainfall during strong winds.

  Since the earthquake-resistant slit material is inserted into a concrete structure and installed, performances such as compression recovery property, fire resistance, and cement paste penetration resistance are required. In order to satisfy these required performances, combinations of plastic foams made of polyethylene resin, polypropylene resin, polystyrene resin, etc. and nonflammable materials such as rock wool, glass wool, ceramic fiber, calcium silicate, or polyvinyl chloride resin, etc. In many cases, the synthetic resin is composed of a nonflammable foam composed of a composition obtained by mixing a large amount of inorganic powder mainly composed of calcium carbonate (75 to 90 wt% in the nonflammable foam).

  When a slit material made of a plastic foam or the like, which is a material different from concrete, is inserted between the concrete, the concrete and the earthquake-resistant slit material have poor adhesiveness, so that a gap that allows rainwater to enter easily occurs between them. Therefore, a waterproof portion is secured by providing a joint portion in advance on the outdoor side of the slit material and filling and installing a sealing material there.

  If the sealant breaks or peels off due to long-term deterioration under natural conditions, deformation due to earthquake, strong wind, etc., there is a concern about water leakage to the indoor side through the gap between the slit material and concrete. . In particular, since the horizontal slit member is installed horizontally with respect to the concrete slab surface (floor surface), it becomes a part where rainwater easily enters due to the structure. Therefore, water stoppage countermeasures at this site are an important consideration.

  For example, as shown in FIG. 10, a water stop mechanism for a concrete joint portion provided with a conventional horizontal slit material is a horizontal slit material 100 comprising a foam 100a made of polyolefin resin or the like and an incombustible material 100b made of rock wool or the like. Is installed horizontally with respect to the concrete surface 101 of the beam or slab, a wall formwork is assembled thereon, and the concrete 103 of the wall is placed. In the case of installing in a raining part such as an outer wall, a joint part is provided on the outdoor side in advance when the horizontal slit member 100 is installed, and the joint part is filled with a sealing material 104 after dismantling the formwork.

  However, these sealing materials 104 may be broken or peeled off due to deterioration under long-term natural conditions or deformation such as expansion and contraction due to earthquakes and strong winds. In that case, rainwater or the like may pass through the gap between the slit member 100 and the concrete 101 and 103 and cause water leakage to the indoor. Therefore, for the purpose of preventing water leakage, a structure in which butyl rubber 105 is installed on a part of the upper and lower surfaces of the horizontal slit member 100 as shown in FIG. 10 is known (see Patent Document 2).

  Further, as shown in FIG. 11, a structure using a step-type joint joint is also known (see Patent Document 3). This is because the sealing material 104 and the step-type joint joint 106 are located below the horizontal slit material 100, and the gap serving as the rainwater infiltration path is lowered by one step, so that rainwater or the like is structurally moved from the outdoor side to the indoor side. It is a structure that expects a secondary water stop effect by making it difficult for intrusion.

  In addition, as shown in FIG. 12, even when a gap serving as a rainwater infiltration path is generated, the horizontal slit member 100 made of the foam 100a and the non-combustible material 100b is inclined so as to be lower toward the outdoor side than the indoor side. Thus, a structure in which the lower end position of the sealing material 104 is configured to be lower than the upper surface of the concrete 101 on the indoor side so that rainwater or the like hardly enters the indoor side from the outdoor side is known (Patent Document 4). reference).

JP-A-11-293921 (0018, 0019, FIG. 1, FIG. 2) JP 2001-49748 A (FIG. 2) JP 2001-3492 A (FIG. 3) Japanese Unexamined Patent Publication No. 2000-345702 (FIG. 5)

  The water stop mechanism having the structure described in Patent Document 1 has a problem that the shape of the butyl tape is unstable and the construction is difficult.

  The water stop structure of the structure shown in Patent Document 2 has poor adhesion between the horizontal slit member 100 and concrete as described above, and the concrete surface of the installation site has already been constructed with reinforcing bars for jointing. In many cases, it is difficult to finish the surface of the concrete surface smoothly because the reinforcing bars are in the way. As described above, the horizontal slit material is mostly applied to a portion where the unevenness (unevenness) of the concrete surface is large, and further, a gap is easily formed.

  In addition, when it is possible to finish the concrete surface smoothly, a secondary water stop effect can be expected by attaching butyl rubber to part of the upper and lower surfaces of the horizontal slit material. However, as described above, it is often difficult to finish the concrete surface smoothly, and since the adhesion between butyl rubber and the concrete surface naturally deteriorates when the unevenness is large, there is a gap between the concrete and the slit material. It is not an improvement measure for, and it tends to become water supply.

  In addition, when the concrete surface is finished smoothly, a secondary water stop effect can be expected, but since it takes cost and time, it is difficult to expect a sufficient water stop effect by realistic construction. In the case of the structure shown in FIG. 10, since the joint rod comes right next to the horizontal slit member 100, the filling of the concrete on the joint portion is poor, and it becomes easy to cause defects such as junkers, and cracks have occurred from there. In such a case, rainwater or the like may enter from an unexpected location, and water stoppage countermeasures in that case are extremely difficult.

  The water-stop structure described in Patent Document 3 has a problem that the construction site is limited because the step-type joint may have a cross-sectional defect of the beam portion. Moreover, although it is a level | step difference, since it stops water in parallel with respect to the joint surface which may become a rainwater permeation | transmission path | route, depending on construction precision, there is a possibility of water leakage to the indoor side.

  The water stop structure described in Patent Document 4 has a problem that the construction site is limited because there is a risk of a cross-sectional defect of the beam portion. In addition, even though the slit material is inclined, the joint surface that may become a rainwater infiltration path is continuous in parallel to the indoor side, so there is a concern of water leakage to the indoor side depending on the construction accuracy. The

  The present invention is intended to eliminate the above-mentioned drawbacks of the prior art, and is a concrete structure that is more excellent in water-stopping performance than conventional water-stop mechanisms, is easy to construct, and can be reliably constructed. Providing a water stop mechanism for the joint part, and can be used in a wide range of construction sites without the risk of cross-sectional defects in the beam part in the concrete joint part using earthquake-resistant slit material, and does not depend on construction accuracy It aims at providing the water stop mechanism provided with the outstanding water stop performance, and providing the water stop member which has a simple structure and can be supplied cheaply.

The present invention
(1) It is a water stop structure of a concrete joint part when placing the post-cast concrete on the pre-cast concrete and casting the concrete after placing the cast concrete.
A waterproofing member provided with a waterproof layer made of an elastic material that is waterproof and can adhere to concrete in the longitudinal direction of the surface of the long and rigid plate-like member is short of the waterproofing member. Post-cast concrete is placed with the waterproof layer partially embedded in the pre-cast concrete so that the hand direction is the vertical direction and the longitudinal direction of the water-stopping member is the horizontal direction of the concrete structure Water stop structure of concrete joints, characterized by
(2) After placing the pre-cast concrete, place the earthquake-resistant slit material in the horizontal direction on the pre-cast concrete, and place the post-cast concrete that constitutes the wall on it, and construct the concrete by the earthquake-resistant slit method It is a water stop structure of the concrete connection part when constructing a thing,
A waterproofing member provided with a waterproof layer made of an elastic material that is waterproof and can adhere to concrete in the longitudinal direction of the surface of the long and rigid plate-like member is short of the waterproofing member. Post-cast concrete is placed with the waterproof layer partially embedded in the pre-cast concrete so that the hand direction is the vertical direction and the longitudinal direction of the water-stopping member is the horizontal direction of the concrete structure Water stop structure of concrete joints, characterized by
(3) The water stop structure of the concrete joint portion according to the above (1) or (2), wherein the waterproof layer is made of non-vulcanized butyl rubber,
(4) On the surface of the long and rigid plate-like member, a waterproof layer made of an elastic material that is waterproof and can adhere to concrete is provided so as to be continuous in the longitudinal direction of the plate-like member. A water stop member,
(5) The waterproofing member according to (4) above, wherein the waterproof layer is made of non-vulcanized butyl rubber, and the surface thereof is covered with a release sheet.
(6) The water-stopping member according to (4) or (5) above, wherein a portion where the waterproof layer is not covered is formed below the water-stopping member in the short direction,
Is a summary.

  The water stop mechanism of the present invention is such that the waterproof layer of the water stop member is in the horizontal direction of the concrete structure, and the short direction of the water stop member is in the vertical direction of the joint portion, and the waterproof layer is applied to the pre-cast concrete. Therefore, the waterproof layer can directly shut off the water supply of the concrete connection portion and water stop the concrete connection portion. Furthermore, since the waterproof layer of the water-stopping member is made of an elastic material that can be in close contact with the concrete, the adhesiveness and adhesiveness of the concrete are excellent. As a result, water entering from the outside of the concrete structure is stopped directly by the waterproof layer, so that superior water stopping performance can be obtained as compared with conventional secondary water stopping measures.

  Furthermore, the present invention has a rigid member as a whole because the water-stopping member has a rigid plate-like member as compared with the case where a conventional butyl tape is used as the water-stopping material. It is easy to install the water-stopping member in the up-and-down direction and the longitudinal direction of the water-stopping member in the horizontal direction of the concrete structure. Because it is good, construction is easy, and reliable water-stopping performance that is not affected by construction accuracy can be expected.

  In the present invention, when non-vulcanized butyl rubber is used as the waterproof layer of the water-stopping member, the carboxyl group in the butyl rubber ionically bonds with calcium oxide in the cement, so that a higher water-stopping effect is obtained.

  In the present invention, since a part of the waterproof layer of the water-stopping member is embedded in the pre-cast concrete, it is not affected by the unevenness of the concrete joint surface due to the unevenness of the pre-cast concrete surface. Water stop performance is obtained.

  Moreover, what provided the said waterproof layer on the surface of the said plate-shaped member so that it may continue in the longitudinal direction of a plate-shaped member is excellent in the water-stopping effect since a waterproof layer continues. In addition, when the waterproof layer is made of non-vulcanized butyl rubber, since the adhesiveness is high, it is preferable to cover the surface with a release sheet in consideration of handling and installation workability of the water stop member. In that case, what is necessary is just to peel a peeling sheet prior to placement of concrete. In addition, it is preferable to form a portion where the waterproof layer is not covered below the water stop member in the short direction because the portion can be used as a fixing portion when fixing the portion to a reinforcing bar or the like. In addition, when the water-stopping member is inserted before the joint portion of the pre-cast concrete is sufficiently hardened, the insertion is easy if the portion not covered with the waterproof layer is the insertion start portion. Thus, a part of the waterproof layer can be easily embedded in the precast concrete.

  In addition, the present invention provides a water stop with excellent water stop performance that does not depend on construction accuracy and can be used in a wide range of construction sites without the risk of cross-sectional defects in the beam portion in a concrete joint using an earthquake-resistant slit material. A mechanism is obtained. That is, in the present invention, rainwater, etc., such as a structure in which joint joints are installed to provide a step with a conventional horizontal slit material, a structure in which the horizontal slit material is inclined in the form of a cross-sectional defect of the beam toward the outdoor side, etc. Unlike conventional water stopping mechanisms that ensure water stopping performance by making the structure difficult to enter, there is no need to worry about the trouble of installing a weir or the cross section of the beam, so there are restrictions on the construction site. Few. Moreover, because the structure is designed to stop the water in a direction perpendicular to the intrusion path of water, rainwater, etc. may enter the indoor side even if it is installed in a place where the concrete surface is uneven (unevenness). Absent.

  In addition, when using a plurality of water-stopping members, the joints between the water-stopping members are connected so that the waterproof layer overlaps the abutting part when the plate-like members are abutted, for example, so that reliable water leakage of the joints is achieved. Can be prevented.

  Furthermore, in the present invention, there is no restriction on the position to stop water in the concrete joint portion using the earthquake-resistant slit material, so that both the complete slit material completely penetrating the frame surface and the partial slit material partially penetrating the frame surface It can be used. Since the outdoor side of the partial slit material is a concrete frame, it seems that a secondary water stop mechanism is unnecessary, but the concrete transfer part is also likely to become water supply, so a secondary water stop measure is to prevent water leakage. Then it is effective.

  1A and 1B show an embodiment of a water stop member of the present invention, in which FIG. 1A is a perspective view and FIG. 1B is a cross-sectional view taken along line AA of FIG. The water-stop member 1 is configured by laminating a waterproof layer 3 made of a material having waterproofness and elasticity capable of being in close contact with concrete on a long and rigid plate-like member 2. The waterproof layer 3 may be provided so as to be continuous in the longitudinal direction of the plate-like member 2. The water stop member of the aspect shown in FIG. 1 is configured such that the waterproof layer 3 continuously covers the upper half or more of the plate-like member 2 across the front and back.

  The plate-like member 2 may be a plate-like member having rigidity such as an iron plate or a plastic plate. Specifically, the rigidity necessary for the plate-like member is sufficient if it is strong enough to prevent bending when placing concrete. Moreover, when a nonflammable material (nonflammable material) is used as the material of the plate-like member 2, it can also function as a nonflammable material of a horizontal slit material described later. The thickness of the plate member is preferably 0.1 mm to 10 mm, and more preferably 1 to 3 mm. If the thickness is less than 0.1 mm, the strength of the plate-like member itself is weak, and there is a possibility that it will bend or break due to the pressure at the time of installation or concrete placement, and will deviate from the original installation position. There is a possibility that a sufficient water stop effect cannot be obtained. On the other hand, if the thickness exceeds 10 mm, the cost increases and the cross section of the beam may be lost.

  The waterproof layer 3 is formed by laminating a sheet having a predetermined thickness on the surface of the plate-like member 2 or by laminating a sheet at a predetermined position on the surface of the plate-like member 2. be able to. The thickness of the waterproof layer 3 is preferably 0.5 mm to 10 mm, more preferably 1 mm to 3 mm. When the thickness of the waterproof layer 3 is less than 0.5 mm, it is not possible to follow the movement of the concrete due to drying shrinkage or the like, and there is a possibility that sufficient water stop performance cannot be obtained. On the other hand, if the thickness of the waterproof layer 3 exceeds 10 mm, the cost increases and the cross section of the beam may be lost.

  As the waterproof material used for the waterproof layer 3, a material having good adhesion to concrete and having a water stopping performance is used. Specifically, styrene / butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR), ethylene / propylene copolymer (EPM), ethylene / propylene / diene copolymer (EPDM), acrylonitrile- Butadiene copolymer rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR), urethane rubber, silicone rubber, polysulfide rubber, hydrogenated tolyl rubber, fluorine rubber, acrylic rubber, epichlorohydrin rubber, natural rubber, Liquid rubbers such as polysulfide rubber liquid rubber, silicone liquid rubber, urethane liquid rubber, diene liquid rubber, styrene thermoplastic elastomer, olefin thermoplastic elastomer, urethane thermoplastic elastomer, polyamide thermoplastic elastomer, Polybutadiene thermoplastic Elastomers, vinyl chloride type thermoplastic elastomers include thermoplastic elastomers such as fluorine-based thermoplastic elastomer.

  The waterproof material is preferably a tacky material because it has good adhesion to concrete and can exhibit waterproof performance. As the waterproof material constituting the waterproof layer 3, a waterproof material such as vulcanized butyl rubber, non-vulcanized butyl rubber, and a water-swellable sealant can be preferably used. In particular, butyl rubber is preferable because it is excellent in weather resistance, aging resistance, ozone resistance, steam resistance / gas permeability resistance, and water resistance. The butyl rubber includes non-vulcanized butyl rubber and vulcanized butyl rubber, and the non-vulcanized butyl rubber is particularly preferable because it has adhesiveness and plasticity.

  The waterproof layer 3 of the water blocking member 1 may be provided so as to be continuous in the longitudinal direction of the plate member, and cover the entire surface of the plate member 2 in the short direction of the plate member. 1 may be provided on a part of the surface of the plate-like member 2 as shown in FIG. 1, or may be provided only on one side of the plate-like member. If it is provided on both sides of 2, the safety of water stoppage increases. Further, the length of the waterproof layer 3 in the vertical direction (short direction of the water-stopping member) is preferably 10 mm to 100 mm, and preferably 15 mm to 15 mm when no earthquake-resistant slit material is disposed in order to ensure water-stopping. 50 mm is more preferable, and when the earthquake-resistant slit material is disposed, the thickness is preferably equal to or greater than the thickness of the earthquake-resistant slit material, and more preferably the thickness of the earthquake-resistant slit material +10 mm to +50 mm.

  Moreover, when the location without the waterproof layer 3 (waterproof layer non-covering portion) is formed below the plate-like member 2, when the water-stopping member 1 is installed in the concrete placing space before placing the pre-cast concrete, Since it can utilize for the fixing | fixed part at the time of fixing a waterproof layer non-coating part to a reinforcing bar etc. using a fixing member, it is preferable. In addition, when the water stop member is to be inserted into the joint portion of the pre-cast concrete while the joint portion of the pre-cast concrete is still sufficiently hardened, The insertion becomes easy, and a part of the waterproof layer can be easily embedded in the precast concrete. In addition, as shown in FIG. 2, when the lower end of the waterproof layer non-covering part is in the form of a plurality of bars extending downward, it is easier to stab into the pre-cast concrete, The member 1 can also be reduced in weight. The length of the waterproof layer non-covering portion in the vertical direction (short direction of the water blocking member 1) is preferably 5 mm to 100 mm, and more preferably 10 mm to 50 mm. If the length of the waterproof layer non-covered portion in the vertical direction is too long, it is inferior in economic efficiency.

  Moreover, 10 mm-150 mm are preferable, as for the length of the transversal direction (short direction of the water stop member 1) of the plate-shaped member 2, 20 mm-100 mm are more preferable, and 25 mm-70 mm are still more preferable. If the length of the plate-like member 2 in the short direction is too long, it is inferior in economic efficiency, and if it is too short, the water stop effect may not be sufficiently exhibited.

  The total thickness of the water-stopping member 1 is not particularly limited, but if it is too thick, there is a possibility that the cross section of the concrete may be lost. Therefore, the thickness is usually 15 mm or less, preferably 10 mm or less, more preferably 1 to 5 mm. It is desirable to form. The length of the water stop member 1 is not particularly limited, but the workability is reduced even if it is too long, and if it is too short, the use becomes complicated, so the workability does not deteriorate and handling is easy. It is preferable to form the length so that the work is not complicated. The length is usually 20 cm to 500 cm, preferably 50 cm to 300 cm. Moreover, since the joint of the water stop members 1 is likely to be a defective portion of the waterproof layer 3, attention is required. The waterproof layer 3 at one end in the longitudinal direction of the water-stopping member 1 is formed so as to protrude from the end of the plate-like member 2 so as not to have a defective portion of the waterproof layer 3, and the waterproof layer at the abutted end Is preferably formed so as to be an overlapping portion. Moreover, after installing or arranging the water-stopping members 1 as another method that does not cause the defective portion of the waterproof layer 3 at the joints between the water-stopping members 1, a joint portion between the water-stopping members 1 is prepared separately. The waterproof layer 3 can be covered with a part of the waterproof layer 3 or the waterproof layers 3 of the waterproof member 1 can overlap each other in the thickness direction of the waterproof member 1. Can also be installed or arranged in a staggered manner. In any case, the overlapping portion is preferably 10 mm to 100 mm, and more preferably 20 mm to 50 mm. If there are few overlapping parts, there is a risk of reducing the water stop effect, and if there are many overlapping parts, the economy is inferior.

  Further, a water-soluble resin layer such as polyvinyl alcohol may be provided on the surface of the waterproof layer 3 of the water blocking member 1. Water-soluble resin can prevent adhesion of dust etc. to the waterproof layer during curing when the waterproof layer is sticky, and when the concrete is poured, it dissolves with moisture in the concrete and the waterproof layer is exposed. Finally, since it can be brought into direct contact with the hardened concrete body, it is possible to save the trouble of peeling the release sheet 5 described later.

  As shown in FIG. 3, the water-stopping member 1 may be laminated with a release sheet 5 on the surface of a waterproof layer 3 such as non-vulcanized butyl rubber instead of the water-soluble resin. Further, the release sheet 5 may be provided with a cut 5c. In the embodiment of FIG. 2, the cut 5c is formed so that the release paper 5a and the release paper 5b can be peeled separately. If the notch 5c is formed at a depth to be embedded in the pre-cast concrete, it will be stopped during the installation work in which a part of the waterproof layer 3 of the water blocking member 1 is embedded in the pre-cast concrete. Only the release sheet 5a of the water member 1 is peeled off and the release sheet 5b remains, and it is sufficient to embed the pre-cast concrete up to the notch 5c. The position of the notch 5c serves as a guideline for embedding, and the work is easily performed. be able to. The embedded length of the waterproof layer 3 in the precast concrete is often not smooth at the top of the precast concrete, but is preferably at least 3 mm, more preferably 5 mm to 50 mm, and more preferably 10 mm to 40 mm. Is more preferable. If the buried length is too short, the water stop effect is inferior, and if the buried length is too long, the economic efficiency is inferior.

  4 to 7 show an example in which the water stop mechanism is formed by constructing the water stop member of the present invention, FIGS. 4 to 5 are perspective views, and FIGS. 6 to 7 are cross-sectional views. The water stop mechanism shown in FIGS. 4 to 7 relates to a concrete jointing portion when a concrete building is constructed by the seismic slit construction method. The water-stopping structure of the concrete joint portion when the concrete building is constructed by the seismic slit construction method of the present invention is the seismic slit material (horizontal slit) in the horizontal direction on the precast concrete 17 after placing the precast concrete. Material) 18 is disposed, and a concrete joint portion formed by placing post-cast concrete 19 constituting a wall thereon is targeted.

  In the seismic slit construction method, in order to construct a water-stopping member, first, to form a beam or slab to be pre-cast concrete, a reinforcing bar, a steady bar 14, a joint rod 16 and the like are arranged, and a formwork is assembled. Lay concrete. Usually, the steady bar 14 is held at a predetermined position by being fixed to a reinforcing bar or the like arranged on a beam or a slab, or by being inserted into pre-cast concrete after placing the pre-cast concrete.

  When the precast concrete 17 is placed and the concrete is hardened to some extent, the water-stopping member 1 is inserted into the precast concrete 17 from the waterproof layer uncoated portion side of the plate-like member 2 as shown in FIG. Part of layer 3 is embedded inside the precast concrete. At this time, the waterproofing member 1 is installed so that the short direction of the water-stopping member 1 is the vertical direction and the waterproof layer 3 is continuously located in the horizontal direction of the concrete structure. Thereafter, the pre-cast concrete 17 is cured until the post-cast concrete can be placed, or the mold is disassembled during the curing.

  Next, as shown in FIG. 5, a horizontal slit member 18 is attached to the surface of the precast concrete 17. The horizontal slit member 18 is disposed so that the waterproof layer 3 on the indoor side of the water blocking member 1 and the foam 18a of the slit member 18 are in contact with each other. The horizontal slit member 18 is formed so that the center incombustible material 18b is sandwiched between the foams 18a from both sides, and a cut is made in the portion of the incombustible material 18b so that the steady bar 14 is penetrated. When the incombustible material 18b is formed of an inorganic fiber material, the entire incombustible material 18b is usually covered with a waterproof sheet in order to prevent intrusion of concrete.

  Next, as shown in FIG. 6, the molds 21 and 22 are installed in order to place the post-cast concrete 19 (see FIG. 7) constituting the wall. Concrete is poured from above the horizontal slit material 18 to harden the concrete. After the concrete hardens and cures the concrete for a predetermined period, the formwork 21 and 22 are disassembled and the joint rod 16 is removed, whereby the post-cast concrete 19 is formed as a wall material. As shown in FIG. 7, the joint rod 16 is filled with a sealing material 23 to seal the joint.

  As shown in FIG. 7, the water stop structure of the concrete joint portion where the horizontal slit material of the seismic slit construction method of the present invention is provided is a water stop member in which a waterproof layer 3 is provided in the longitudinal direction of the surface of the plate-like member 2. 1 is a state in which a part of the waterproof layer 3 is embedded in the pre-cast concrete 17 so that the lateral direction of the water blocking member 1 is the vertical direction and the waterproof layer 3 is the horizontal direction of the concrete structure. Post-cast concrete 19 is placed. As shown in FIG. 7, the upper part of the waterproof layer 3 is preferably located above the upper surface of the horizontal slit member 18 in order to further enhance the water stop effect. At this time, the upper part of the waterproof layer 3 is preferably located 5 to 50 mm above the upper surface of the horizontal slit member 18, and more preferably 10 to 30 mm above.

  The water blocking member 1 is provided in a direction perpendicular to a gap (a boundary surface between the pre-cast concrete 17 and the post-cast concrete 19) that becomes a passage for water. The waterproof layer 3 can be provided at an arbitrary position of the plate-like member 2 within a range that meets the object of the present invention. However, as shown in FIG. It is preferable to provide a portion excluding the portion, an upper surface of the plate-like member 2, and a portion excluding a portion of the plate-like member 2 on the indoor side below, since reliable water blocking performance can be exhibited.

  The water stop member 1 is attached to the pre-cast concrete after the pre-cast concrete 17 is fixed in place using a beam or slab reinforcement and a jig that can be fixed. After the pre-cast concrete has hardened to some extent so that the water-stopping member 1 does not fall down, the water-stopping member 1 is inserted perpendicularly to the surface of the pre-cast concrete 17 and fixed. May be.

  In the water stop mechanism of the present invention, the water stop member 1 is installed in a flat plate shape so that the short direction is up and down. Therefore, the water stop member 1 does not become a structural defect of the concrete frame. There is no restriction on the water stop position, and it can be used for both a complete slit material that penetrates the entire concrete frame and a partial slit material that partially penetrates the concrete frame surface.

  Further, as shown in FIG. 8, the water stop member 1 is provided in the vicinity of the center between the indoor side and the outdoor side of the concrete frame, and horizontal slit members 18c are provided on both the outdoor side and the outdoor side of the concrete frame of the water stop member 1. , 18d may be provided. Further, as shown in FIG. 9, a horizontal slit member 18 (18 d) may be provided only on the indoor side of the water stop member 1. The horizontal slit members 18c to 18d shown in FIGS. 8 and 9 are composed of only a plastic foam, and no incombustible material is used. As shown in FIG. 8, when the plate-like member 2 of the water stop member 1 is formed of a non-combustible material, the water stop member 1 can also function as a non-combustible material of the horizontal slit material 18. In this case, there is an advantage that the incombustible material of the horizontal slit material can be omitted.

  Further, in FIG. 8, either or both of the horizontal slit members 18c and 18d can be made of a non-combustible material, and in FIG. 9, the horizontal slit material 18d can be made of a non-combustible material. In this case, the non-combustible material is a non-combustible material composed of a composition obtained by mixing a large amount of inorganic powder mainly composed of calcium carbonate (80 to 90% by weight in a non-combustible foam) with a synthetic resin such as polyvinyl chloride resin. A flexible foam is preferred.

  Further, the water stop mechanism of the aspect shown in FIG. 7 is configured by providing the horizontal slit material 18 between the pre-cast concrete 17 and the post-cast concrete 19. A post-cast concrete 18 can be placed on the concrete 17 to form a water stop structure for a joint portion when the concrete is handed over. Also in the case where a water stop structure is applied to the joint portion of the concrete that does not use the horizontal slit material, the short direction of the water stop member 1 is the vertical direction as in the case shown in FIG. The post-cast concrete 19 may be placed in a state where a part of the waterproof layer 3 of the water blocking member 1 is embedded in the pre-cast concrete 17 so as to be in the horizontal direction of the structure. At this time, the position of the water stop member 1 may be provided anywhere between the outdoor side and the indoor side of the concrete structure.

  As a non-combustible material used for the slit member 18 or the plate-like member 2, a large amount of inorganic powder mainly composed of calcium carbonate is added to a synthetic resin such as ceramic fiber, rock wool, glass wool, polyvinyl chloride resin (non-combustible foaming). Non-combustible foam made of mixed composition, concrete, brick, tile, ceramic tile, asbestos slate, fiber reinforced cement board, glass fiber mixed cement board with a thickness of 3 mm or more, thickness Examples thereof include a fiber-containing calcium silicate plate having a thickness of 5 mm or more, steel, aluminum, a metal plate, glass, mortar, plaster, stone, gypsum board (thickness of 12 mm or more, thickness of base paper for board 0.6 mm or more), and the like.

  As the foam of the slit material 18, a plastic foam made of polyethylene resin, polypropylene resin, polystyrene resin or the like, or an inorganic noncombustible foam mainly composed of calcium carbonate, or the like is used.

  Sealing material 23 is a moisture curable silicone type, modified silicone type, polysulfide type, polyurethane type, oxygen curable type modified polysulfide type, dry curable type emulsion type acrylic type, solvent type butyl rubber type one-component type sealing material, Reaction-curable silicone-based, polyisobutylene-based, modified silicone-based, polysulfide-based, acrylic urethane-based, and polyurethane-based two-component types can be used.

One Example of the water stop member of this invention is shown, (a) is a perspective view, (b) is AA sectional drawing of (a). It is a perspective view which shows the other example of the water stop member of this invention. It is sectional drawing which shows the other example of the water stop member of this invention. It is a perspective view which shows the process of constructing the water stop member of this invention and forming a water stop mechanism. It is a perspective view which shows the process of constructing the water stop member of this invention and forming a water stop mechanism. It is sectional drawing which shows the process of constructing the water stop member of this invention and forming a water stop mechanism. It is sectional drawing which shows an example of the water stop structure of this invention. It is sectional drawing which shows the other example of the water stop structure of this invention. It is sectional drawing which shows the other example of the water stop structure of this invention. It is sectional drawing which shows the conventional water stop mechanism. It is sectional drawing which shows the conventional water stop mechanism. It is sectional drawing which shows the conventional water stop mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water stop member 2 Plate-shaped member 3 Waterproofing layer 17 Precast concrete 18 Slit material 19 Postcast concrete

Claims (6)

After placing the pre-cast concrete, the water-stopping structure of the concrete joint portion when placing the post-cast concrete on the pre-cast concrete and passing the concrete,
A waterproofing member provided with a waterproof layer made of an elastic material that is waterproof and can adhere to concrete in the longitudinal direction of the surface of the long and rigid plate-like member is short of the waterproofing member. Post-cast concrete is placed with the waterproof layer partially embedded in the pre-cast concrete so that the hand direction is the vertical direction and the longitudinal direction of the water-stopping member is the horizontal direction of the concrete structure A water stop structure for concrete joints. After placing the precast concrete, place the earthquake-resistant slit material in the horizontal direction on the precast concrete, and place the post-cast concrete that constitutes the wall on it, and construct the concrete building by the earthquake-resistant slit method It is a water stop structure of the concrete joint part when
A waterproofing member provided with a waterproof layer made of an elastic material that is waterproof and can adhere to concrete in the longitudinal direction of the surface of the long and rigid plate-like member is short of the waterproofing member. Post-cast concrete is placed with the waterproof layer partially embedded in the pre-cast concrete so that the hand direction is the vertical direction and the longitudinal direction of the water-stopping member is the horizontal direction of the concrete structure A water stop structure for concrete joints.   The waterproof structure for a concrete joint portion according to claim 1 or 2, wherein the waterproof layer is made of non-vulcanized butyl rubber.   The surface of the long and rigid plate-like member is provided with a waterproof layer made of an elastic material that is waterproof and can adhere to concrete so as to be continuous in the longitudinal direction of the plate-like member. A water-stop member.   The waterproofing member according to claim 4, wherein the waterproof layer is made of non-vulcanized butyl rubber, and the surface thereof is covered with a release sheet. The water stop member according to claim 4 or 5, wherein a portion where the waterproof layer is not covered is formed below the water stop member in the short direction.

Images