WO2007096934A1

WO2007096934A1 - Crack inducing waterproofing method

Info

Publication number: WO2007096934A1
Application number: PCT/JP2006/302940
Authority: WO
Inventors: Tsuguo Izaki
Original assignee: Izaki Kogyo Co., Ltd.
Priority date: 2006-02-20
Filing date: 2006-02-20
Publication date: 2007-08-30

Abstract

A crack inducing waterproofing method, comprising disposing a crack inducing waterproofing member in the vicinity of reinforcing steel within a concrete frame, placing concrete and curing the concrete to thereby realize not only generation of external cracks between the crack inducing waterproofing member and given locality of the external surface of the concrete frame and internal cracks starting from the crack inducing waterproofing member in the interior surrounded by the reinforcing steel but also waterproofing, characterized in that a liquid waterproofing agent is injected in a hole made in the crack inducing waterproofing member from outside the concrete frame to thereby fill the internal cracks with the waterproofing agent.

Description

Specification

Crack-induced water stop method

Technical field

[0001] The present invention provides a crack-inducing stop for a concrete frame that effectively generates a crack only in a pre-estimated portion of the concrete frame after placement, prevents the occurrence of cracks in other locations, and effectively stops water. It relates to the water method.

Background art

[0002] On the surface of the reinforced concrete structure, it is inevitable that cracks will occur due to hardening shrinkage of the cast concrete. However, if these cracks occur in any number of locations, the intrusion of moisture will only damage the appearance. This may lead to corrosion / deterioration of internal rebar due to, which may lead to a decrease in strength of the frame. In order to prevent these, crack-inducing joints and structures are formed at specific locations in the concrete frame to make the cross-sectional shape different from that of the other parts. In the past, techniques have been taken to prevent random cracks from occurring in the region and to facilitate waterproofing work against the cracks.

[0003] Among the crack-inducing joints and structures that cause cracks to be actively generated in a state where they are properly managed at such presumed locations, crack-inducing members that are embedded with concrete inside the concrete An example of a conventional crack inducing structure for inducing a crack by this is described in Japanese Patent Application Laid-Open No. 11-264200, which is shown in FIGS. FIG. 12 is a schematic cross-sectional view of the construction state of the conventional crack-inducing structure, and FIG. 13 is a schematic cross-sectional view of the crack-inducing state.

[0004] The crack inducing member 100 used in the conventional crack inducing structure in Fig. 12 is a bowl-shaped body having a substantially U-shaped cross section sandwiching a gap serving as the drainage channel 110, and opposed pieces having a predetermined length at both ends of the opening. 101 is provided, and the portion surrounding the drainage channel 110 and the outer side of the opposing piece 101 are covered with a waterproof material 102 made of a predetermined inertia material having excellent durability and crack resistance, and the like. Further, the outer main part is covered with another water-stop material 103 having good adhesion to concrete. [0005] The process for attaching the conventional crack inducing member to the reinforcing bar and causing the crack will be described. First, after the wall reinforcement 120 is arranged, the crack inducing member 100 is fixed to the wall reinforcement 120 while being arranged so that the opening of the drainage channel 110 faces the outside of the wall. On the other hand, a notch forming member 131 such as an L-shaped cross-section member is attached to the mold 130, and its tip protrudes inward from the mold 130. After this, there is no inflow of the concrete into the gap between the opposing pieces 101 in the force crack inducing member 100 in which the concrete is placed in the mold 130. After concrete hardening, the mold 130 is disassembled and the notch forming member 131 is removed, so that the notch is formed by the notch forming member 131 on the front side of the concrete 200, and the crack inducing member 100 is embedded in the concrete 200. Is obtained.

[0006] When the concrete 200 cures and shrinks, the concrete thickness on the front side of the gap between the opposing pieces 101 is thin, so that cracks 202 are induced from the notches 201 on the outer side, and the cracks 202 are formed. The gap between 101 is reached, and the crack 202 and the drainage channel 110 are in communication with each other. When water such as rainwater enters the crack 202, the water flows into the drainage channel 110 through the gap between the opposing pieces 101, falls there, and drops into a pipe provided on the horizontal joint on the first floor of the building, for example. It flows and drains to the outside. The periphery of the crack inducing member 100 is covered with the water-stopping materials 102 and 103 except for the opening, so that the water from the crack 202 can be prevented from flowing to other than the drainage channel 110.

In addition, another example of a conventional crack inducing structure is described in Japanese Patent No. 2868994, which is shown in FIG. FIG. 14 is a schematic cross-sectional view of another conventional crack inducing structure.

[0008] In FIG. 14, the crack inducing member 300 used in another conventional crack inducing structure includes a projecting portion 301a projecting in a mountain shape having a triangular cross section, and a flat plate-shaped flange extending on both sides of the projecting portion 301a. A protruding part 301a is provided between the groove 410 provided on the surface of the concrete structure 400 and the structural reinforcing bar 420. The core 301 is composed of a part 301b and an adhesive layer 302 made of a polymer material. Is arranged to face the groove 410.

In the other conventional crack inducing structure described above, first, the crack inducing member 300 is fixed to the structural reinforcing bar 420 while the protruding portion 3 Ola faces the outside of the structure. Necessary Accordingly, the inner crack inducing member 310 is disposed inside the structural reinforcing bar 420. Thereafter, concrete is placed in a mold surrounding the structural reinforcing bar 420 and the crack inducing member 300, and the crack inducing member 300 is embedded in the structure 400 by hardening the concrete. On the other hand, a groove 410 is formed on the front side of the structure 400 by a member protruding inward at a part of the mold.

When the concrete is cured and contracted, a crack is generated between the groove 410 and the protruding portion 301 a of the crack inducing member 300. Even if this cracking force penetrates the outside air and water, the adhesive layer 302 of the crack inducing member 300 is in close contact with the concrete, and the outside air and water are blocked at the interface between the adhesive layer 302 and the concrete. Is not exposed to open air and water.

[0011] Since the conventional crack inducing structure is configured as described above, in the case of the former former described in JP-A-11 264200, the water that has entered the crack 200 is caused to flow out to the outside. Since drainage equipment is required and the force is embedded in the concrete frame, it is difficult to maintain and follows the crack-inducing member 100, which is not only dangerous but has a high risk of water leakage when the equipment deteriorates. As long as the water is flowing, the deterioration of the crack-inducing member 100 due to water will proceed, so if the crack-inducing member 100 eventually breaks, it will not be possible to prevent the inundation from reaching the rebar and the deterioration of the rebar. However, it was inevitable that the strength of the skeleton was inevitably reduced.

[0012] In addition, if the drainage channel is excessively continuous in the height direction, the drainage capacity is saturated on the lower side and there is a risk that water will leak outside through the crack 200. There was a problem that it was necessary to install equipment, leading to an increase in cost.

[0013] By the way, it is generally known that when a material other than concrete occupies about 30% of the total thickness of the concrete frame, cracks preferentially occur in that portion. The external crack between the outer wall in Japanese Patent Laid-Open No. 11-264200 and Japanese Patent No. 2868994 occurs due to this phenomenon. On the other hand, as for the internal cracks generated in the concrete, if the thickness is relatively thin (for example, up to 45 cm), cracks are preferentially generated in the portion where the crack inducing member is disposed. If the thickness is too thick, it will not be possible to generate cracks in the initially assumed location, and the water inside the structure will not be properly stopped due to irregular cracks. [0014] In the lower part of the reinforcing bar, which was further struck laterally, a void was generated due to the shrinkage caused by the hardening of the concrete, and this void became a passage for water to promote corrosion of the reinforcing bar. It is supposed to turn water.

[0015] In the case of the construction method described in Japanese Patent No. 2868994, the water stoppage on the surface side of the structure 400 is possible by the surface pressure-sensitive adhesive layer of the crack inducing member 300, and is surrounded by reinforcing bars by the inner crack inducing member 310. Internal cracks generated in the interior remain as voids, and no effective measures have been taken to deal with the voids in the lower part of the rebar that is the passage of water. Further improvements are needed.

Disclosure of the invention

[0016] The present invention solves these problems, and can appropriately induce external and internal cracks and appropriately stop water, and prevent water from reaching both the inside and outside of the concrete structure. It is an object of the present invention to provide a crack-induced water-stopping method for a concrete housing that can surely prevent deterioration of the strength of an object and can be constructed at low cost, a crack-induced water-stopping structure and a crack-induced water-stopping member used in the method.

That is, according to the present invention, after a crack-inducing water-stopping member is arranged in the vicinity of a reinforcing bar inside a concrete frame, the concrete is placed, and as the concrete hardens, the crack-inducing water-stopping member and a predetermined surface of the concrete frame are fixed. In the crack-induced water stop construction method, an internal crack is generated from the crack-induced water-stopping member in the interior surrounded by external cracks and reinforcing bars, and the water is stopped.

The crack-inducing water-stopping member is a long member having a T-shaped cross section, and a hole penetrating in the longitudinal direction of the long member is formed in the base of the convex portion of the T-shaped, One or two or more openings are provided in a flat surface forming a T-shaped flat portion to communicate the hole and the outside, and at least a part or all of the surface other than the opening of the flat surface is in contact with the concrete. A member covered with a coating layer of an adhesive material having excellent adhesion, wherein the crack-inducing water-stopping member is placed in the vicinity of a reinforcing bar inside the concrete frame so that the convex portion of the member faces the outer surface of the concrete frame. Arranged,

Do not hold the crack-inducing water-stopping member and the outside of the concrete body in a state where they can communicate with each other. Harden the concrete,

Concrete frame external force Liquid water-stopping agent is injected into the hole of crack-inducing water-stopping member, and the water-stopping agent is filled into the internal crack through the opening.

The present invention relates to a crack-induced water stop method.

[0018] Further, the present invention is a crack-inducing water-stopping structure for a concrete structure including a reinforcing bar and a crack-inducing water-stopping member,

The crack-inducing water-stopping member is a long member having a τ-shaped cross section, and a hole for injecting a water-stopper penetrating in the longitudinal direction of the long member is formed at the base of the convex portion of the T-shape. 1 or 2 or more openings are provided on the flat surface forming at least the T-shaped flat portion to communicate the hole with the outside, and at least a part of the surface other than the opening of the flat surface. Or it is a member that is entirely covered with a coating layer of adhesive material with excellent adhesion to concrete,

The crack-inducing water stop member is disposed in the vicinity of the reinforcing bar inside the concrete frame so that the convex part of the member faces the outer surface of the concrete frame;

A communicating member is connected to the hole to hold the hole of the crack-inducing water-stopping member and the outside of the concrete frame in a state where they can communicate with each other.

It also relates to a crack-induced water stop structure.

[0019] Furthermore, the present invention provides an external crack and a crack surrounded by a reinforcing bar between the predetermined part of the outer surface of the concrete frame as the concrete is hardened, and to stop water. It is a crack-induced water-stopping member that is placed near the reinforcing bar inside the concrete frame,

Cross-sectional shape is a τ-shaped long member, and has a hole for injection of a water-stopping agent penetrating in the longitudinal direction of the long member at the base of the convex portion of the c-shaped shape, and at least the τ-shaped 1 or 2 or more openings are provided on the flat surface forming the flat portion of the flat surface, and at least a part or all of the surfaces other than the openings of the flat surface are adhered to the concrete. Brief description of the drawing also relates to a crack-induced water-stopping member covered with a coating layer of an adhesive material having excellent properties [0020] FIG. 1 is a schematic cross-sectional view of an embodiment of a crack-inducing waterstop member according to the present invention during construction.

FIG. 2 is a schematic perspective view of one embodiment of a crack-inducing water stop member of the present invention.

3 is a partially omitted rear view of the crack-inducing water stop member of the present invention shown in FIG.

FIG. 4 is a schematic partial perspective view of another embodiment of the crack-inducing water stop member of the present invention.

FIG. 5 is a schematic partial rear view of the crack-inducing water stop member of the present invention shown in FIG.

FIG. 6 is a schematic partial rear view of another embodiment of the crack-inducing water stop member of the present invention.

FIG. 7 is a schematic cross-sectional view of the structure of the present invention in an uncured state when concrete is placed.

[Fig. 8] Fig. 8 is a schematic cross-sectional view showing a state where the concrete frame in Fig. 7 is cured.

FIG. 9 is a schematic cross-sectional view of a state in which a crack-inducing water stop member and an internal crack-inducing member fixed to a reinforcing bar are fixed.

FIG. 10 is a schematic partial perspective view of an internal crack inducing member fixed to a reinforcing bar in a fixed state.

FIG. 11 is a schematic cross-sectional view showing a state where the concrete frame is hardened when an internal crack inducing member is disposed.

FIG. 12 is a schematic cross-sectional view showing a construction state of a conventional crack inducing member described in JP-A-11-264200.

FIG. 13 is a schematic cross-sectional view of a state in which cracks have occurred in the construction state shown in FIG.

FIG. 14 is a schematic cross-sectional view showing a construction state of a conventional crack inducing member described in Japanese Patent No. 2868994.

BEST MODE FOR CARRYING OUT THE INVENTION

[0021] In the construction method, structure and member of the present invention, the diameter of the hole is enlarged at one end in the longitudinal direction of the crack-inducing water-stopping member, and can be inserted into the enlarged hole at the other end. It is preferable that a functioning annular protrusion is provided.

[0022] By configuring the end portion of the crack-inducing water-stopping member in this way, it becomes easier to connect a hole for injecting the water-stopping agent and a pipe for communication with the outside of the concrete frame, and injection and filling of the water-stopping agent Work becomes easy. Also, by fitting the part with the enlarged hole diameter and the annular protrusion, Since the crack-inducing water-stopping members can be connected to each other while maintaining the communication state of the holes, the dimensions of the inducing-water-stopping members can be shortened, and the arrangement work can be facilitated after storage. It is possible to inject and fill the water-stopping agent to every corner of the internal crack induced in the concrete frame.

[0023] In the construction method, structure and member of the present invention, it is preferable that the opening of the crack-inducing water-stopping member is one or more slits or one or more small holes.

[0024] By making the opening for injecting and filling the water-stopping agent into the internal crack into a slit or a vertically long hole, the water-stopping agent is widened in the longitudinal direction of the induced water-stopping member and evenly spread outside the member. It can be made to flow out, and filling and sealing to the internal crack can be ensured. In addition, the cross-sectional shape of the crack-inducing water-stopping member can be made almost constant over the entire length of the member, so that the strength can be improved and the structure can be simplified. For example, when the slit is opened at both ends, the induced water-stop member can be extruded, and manufacturing is easy and cost reduction can be realized.

[0025] In the construction method, structure and member of the present invention, the opening is covered with a mesh sheet or paper (tape paper), which allows water-stopping agent to pass through but does not pass through uncured concrete. It is preferable to have a structure.

[0026] By covering the openings (slits, small holes, etc.) with a mesh sheet or paper having the above characteristics, it is possible to prevent intrusion of uncured concrete into the holes, and the water will remain after the concrete is placed. The agent can easily be poured into the pores and, after the concrete has hardened, the internal cracks can be filled into the internal cracks through the openings and mesh sheets or paper.

[0027] In the construction method and structure of the present invention, an internal crack inducer is disposed in parallel with the crack-inducing water-stopping member before placing the concrete in the central portion of the concrete frame surrounded by the reinforcing bars. Is preferred ヽ.

[0028] By arranging the internal crack inducing body in advance in the central portion of the interior of the concrete frame surrounded by the reinforcing bars, the width of the internal crack inducing body is such that it is difficult to induce an effective internal crack with only the crack-inducing water-stopping member. Even in the case of a wide concrete structure, it is possible to intentionally induce an internal crack between the internal crack-inducing body and the crack-inducing water-stopping member. Sealing · Can stop water. [0029] In the construction method and structure of the present invention, an internal crack parallel to the crack-inducing water-stopping member is placed before the concrete is placed in a position facing the crack-inducing water-stopping member inside the concrete frame surrounded by reinforcing bars. It is preferable to arrange an inducer promoter.

[0030] The strong internal crack inducing body promoting body has the same effect as the internal crack inducing member described in Japanese Patent No. 2868994, and effectively prevents internal cracks originating from the crack inducing water stop member. The internal crack can be effectively sealed and stopped by filling the water-stopping material from the crack-inducing water-stopping member. This internal crack inducer promoting body may be used in combination with the internal crack inducer.

Next, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to such embodiments, and includes modifications and changes obvious to those skilled in the art.

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention during construction of a crack-inducing water-stopping member, and FIGS. 2 and 3 are a schematic perspective view and a partially omitted rear view of the crack-inducing water-stopping member, respectively. FIG.

[0033] In this embodiment, reference numeral 1 denotes a crack-inducing waterstop member, which is a long member having a substantially T-shaped cross section (see Figs. 1 to 3). The crack-inducing water-stopping member 1 is preferably made of a metal such as aluminum or a synthetic resin such as polyvinyl chloride or vinyl from the viewpoint of weight reduction and ease of manufacture.

[0034] The crack-inducing water stop member 1 will be described with reference to FIG. In Fig. 1, the upper side of the page is the direction of the outer wall of the concrete frame, and the lower side of the page is the direction of the reinforcing bar (see Fig. 7).

[0035] The crack-inducing water-stopping member 1 is composed of the T-shaped convex portion 2 and the T-shaped flat portion 3, and the water-stopping agent penetrates the base of the convex portion 2 in the longitudinal direction of the long member. An injection hole 4 is drilled. Further, the flat surface 5 forming the flat portion 3 is provided with one or two or more openings 6 communicating with the hole 4 and the outside, and at least other than the openings 6 of the flat surface 5 in which the holes 4 are provided. Part or all of this surface is covered with a covering layer 7 such as an adhesive material having excellent adhesion to concrete, for example, butinole rubber.

[0036] As shown in FIGS. 1 and 3, the opening 6 of the crack-inducing water-stopping member 1 is covered with a mesh sheet 8 that allows water-stopping agent to pass through but does not pass through uncured concrete. Sometimes uncured concrete can be prevented from flowing into the holes 4 and as a result After the cleat has hardened, a waterproofing agent (not shown) can be injected and filled from the hole 4 through the opening 6 into the concrete frame. Paper tape or the like may be used instead of the mesh sheet.

[0037] As a method for preventing intrusion of uncured concrete into the holes 4, in addition to a method using a mesh-like sheet 8 or paper, a method of narrowing the slit-like opening 6 by applying pressure to both sides, a slit There is also a method of leaving a part of the shape-like opening 6 and closing it, and the cost is reduced because no sheet material is used.

[0038] Alternatively, the end of the crack-inducing water-stopping member 1 of the hole 4 may be formed as a recess 9 by enlarging the hole diameter (see FIGS. 2 and 3). This recess 9 is useful when connecting a pipe (V, not shown) for injecting a water-stopping agent into the hole 4.

[0039] Further, the end of the hole 4 of the crack-inducing water-stopping member is the end of the hole 4 of the crack-inducing water-stopping member as shown in Fig. 4 which is a schematic partial perspective view and Fig. 5 which is a schematic partial rear view, for example. The part may be an annular protrusion 10. Also, when one end of the hole 4 of the crack-inducing water stop member is a recess 9 and the other end is an annular protrusion 10 that can be inserted into the recess 9, The recess 9 and the annular protrusion 10 of another crack-inducing water-stopping member 1 can be fitted and connected together, and can be applied to a large concrete structure. In addition, the size of the crack-inducing water-stopping member 1 can be shortened, the storage operation becomes easy, and the communication state of the holes 4 can be maintained, so that a water-stopping agent can be applied to all the cracks inside the concrete frame after hardening. Can be injected and filled.

[0040] As shown in FIGS. 1, 3, and 5, the opening 6 may be a single slit or may be divided into a plurality of slits. Further, an ellipse may be used, or a small hole 11 may be used as shown in FIG. The shape of these openings may be appropriately selected depending on the length of the water-stopping agent used. When the opening 6 is a single slit with both ends open, the crack-inducing water-stopping member 1 can be extruded, and manufacturing is easy and cost reduction can be realized.

[0041] The adhesive coating layer 7 prevents water entering from external cracks from reaching the reinforcing bars of the concrete frame, and may be any material that has good adhesion to concrete. Preferably, butyl rubber can be used, but is not limited thereto. The coating layer 7 has at least the pores 4 is provided on a part or all of the surface other than the opening 6 of the flat surface 5, and in order to further ensure the infiltration of water from the external crack, the opening It is preferable to install it on the entire surface other than 6.

Next, one embodiment of the construction method will be described with reference to FIGS. Fig. 7 is a schematic cross-sectional view of the uncured state when concrete is placed in accordance with the method of the present invention for the structure of the present invention, and Fig. 8 is a schematic cross-sectional view of the concrete frame of Fig. 7 in a cured state. is there.

[0043] The crack-inducing water-stopping member 1 of the present invention is disposed and fixed to the reinforcing bar 30 with a wire or the like with the convex portion 2 facing the outer wall surface of the concrete frame 40. Fixing to the reinforcing bar 30 may be performed directly or via a mounting member 31 such as a short reinforcing bar. However, it is important to fix the opening 6 so that it is not blocked.

[0044] The force that rebar 30 is usually assembled on both sides of concrete frame 40 In that case, as shown in Fig. 7, the flat part 5 faces the crack-inducing water-stopping member 1 on each side of the rebar. This is preferable because it induces the generation of internal cracks 42 (Fig. 8).

[0045] Furthermore, when the concrete frame is thick (for example, when the thickness exceeds 45 cm), the internal crack inducer 20 is surrounded by the reinforcing bars of the concrete frame 40 in order to generate the internal crack 42 at the target position. It is preferable to arrange on the line connecting the crack-inducing water-stopping members 1 on both sides at the center of the broken portion. The internal crack inducing body 20 has a length approximately the same as that of the crack inducing water stop member 1. The shape of the internal crack inducing body 20 is not particularly limited. 1S For example, in addition to a round or rectangular tube material, a round bar or a square material may be used. For example, a tube made of polysalt vinyl is preferable. The internal crack inducing body 20 may be installed only to be temporarily fixed to the reinforcing bar 30. Instead of or in combination with the internal crack inducing body 20, an internal crack inducing member 21 (FIGS. 9 to 11) described later may be provided.

[0046] Next, the mold 60 is placed at a predetermined position, and concrete is driven into the mold. After the concrete has hardened, the mold 60 is provided with a protrusion 61 for forming the induction joint 50 (Fig. 8) at the position facing the convex part 2 of the crack-inducing water-stopping member 1. Further, it is possible to easily generate the external crack 41 (FIG. 8) at a predetermined position between the convex portion 2 and the outer wall surface. [0047] After the concrete is cast in the mold 60 and hardened, when the mold 60 is removed, the thin part of the concrete, that is, the external crack 41 as shown in FIG. An internal crack 42 is induced between the convex portion 2 of the water member 1 and the induction joint 50, and between the crack induction water-stopping members 1 via the crack induction body 20. By generating (inducing) cracks at predetermined locations in this way, it is possible to prevent a large number of cracks from occurring randomly.

[0048] Even if the external crack 41 is left untreated, the adhesive covering layer 7 of the crack-inducing water-stopping member 1 can prevent water from entering the rebar 30. An appropriate joint agent (water-stopper) is injected from the outside. Further sealing can be achieved by sealing.

[0049] On the other hand, the internal crack 42 includes a pump or the like (not shown) connected to a hole 4 of the crack-inducing water-stopping member 1 (for example, an enlarged recess 9 or an annular protrusion 10 of the hole 4). A water-stopping agent is injected, and the water-stopping agent is injected and filled from the opening 6 through the sheet 8 to solidify, and the internal crack 42 is stopped. Reinforcing bars are the most important part because they are susceptible to deterioration due to water ingress and must be protected. Therefore, it is most important that water stop around rebar 30, so it is desirable for the water-stopper to spread throughout internal crack 42. It is sufficient that at least cracks in the vicinity of the reinforcing bar around the crack-inducing water-stopping member 1 (including the gap in the lower part of the horizontal reinforcing bar) can be stopped. As described above, according to the present invention, the penetration of water into the reinforcing bar 30 can be achieved by the crack-inducing water-stopping member 1 disposed in the reinforcing bar 30.

[0050] The water-stopping agent is not particularly limited as long as it has good fluidity and excellent water-stopping effect, and may be an inorganic water-stopping agent or an organic water-stopping agent. For example, a known permeable silica aqueous solution containing colloidal silica is suitable. This permeable silica-based water-stopping agent penetrates into the internal cracks generated by ultrafine particles of silica in the concrete body, reacts with the alkaline substances and hydrates in the concrete around the cracks, gels, Fill the inside of the crack with this silica gel and stop the water. In addition, urethane water-stopping agent and cement milk injected into the soil during tunnel excavation can also be used. However, it is desirable that it does not contain or generate acid or chlorine that easily corrodes reinforcing bars. The water-stopping agent for internal cracks and the joint agent for external cracks may be the same or different.

[0051] As shown in FIGS. 9 to 11, even when the concrete frame is thick, the internal In order to further ensure that the crack is generated in the vicinity of the opening 6 of the crack-inducing water-stopping member 1, an internal crack similar to that proposed as the inner crack-inducing member 310 in Japanese Patent No. 2868994 is disclosed. You can arrange the trigger member 21 inside the reinforcing bar! Fig. 9 is a schematic cross-sectional view of the fixed state of the crack-inducing water stop member 1 and the internal crack-inducing member 21 fixed to the reinforcing bar, and Fig. 10 is an outline of the fixed state of the internal crack-inducing member 21 fixed to the reinforcing bar. FIG. 11 is a partial perspective view, and FIG. 11 is a schematic cross-sectional view of a state where the concrete frame is cured when the internal crack inducing member 21 is disposed.

[0052] The internal crack inducing member 21 is a reinforcing bar 30 corresponding to the opening 6 of the crack-inducing water-stopping member 1 so that the water-stopping agent effectively flows into the internal crack from the opening 6 in the crack-inducing water-stopping member 1. Fixed to the inside of the set (inside the concrete frame). The internal crack inducing member 21 is preferably a plate-like member because it is easy to direct the direction of occurrence of cracks. A plate made of polysalt gel is preferred. The size may be appropriately determined depending on the size of the concrete frame, but usually, it is preferential if the total length of the crack-inducing water-stopping member 1 and the internal crack-inducing member 21 is 30% or more of the total thickness of the concrete frame. Internal cracks can be induced.

[0053] The internal crack inducing member 21 may be fixed to the reinforcing bar 30 with a wire or the like, but may be simply fixed with a dedicated clamp 22 as long as positioning is sufficient.

[0054] After fixing the crack-inducing water-stopping member 1 and the internal crack-inducing member 21 and, in the case of a wall thickness, the internal crack-inducing body 20, and surrounding it with a formwork, the concrete is cast and cured in the same manner as described above. More reliable water stop can be achieved by filling a water-stopping agent in the generated external cracks and internal cracks, and also in the gaps in the lower part of the horizontal reinforcing bars.

Industrial applicability

[0055] By adopting the construction method, structure, and member of the present invention, the penetration of water from the external crack intentionally induced between the outer surface (outer wall) of the concrete frame and the crack-inducing water-stopping member is prevented. It is possible to prevent water from reaching the rebar by blocking with the adhesive coating layer provided on the outer wall surface of the crack-inducing water-stopping member. Internal cracks that occur to In addition to internal cracks, cracks that occur between the crack-inducing water-stopping member and the reinforcing bar are also included in the inside, and cracks that are also formed in the gaps formed under the horizontal reinforcing bar By filling the water-stopping agent injected into the hole of the member and released from the opening, cracks inside the concrete housing and water-stopping near the reinforcing bars can be achieved reliably. As a result, the strength of the whole concrete structure can be maintained for a long time.

Claims

The scope of the claims

[1] After placing a crack-inducing water-stopping member in the vicinity of the reinforcing bar inside the concrete frame, the concrete is placed, and as the concrete hardens, there is a gap between the crack-inducing water-stopping member and a predetermined location on the outer surface of the concrete frame. In the crack-induced water-stop method, an internal crack that originates from a crack-induced water-stopping member is generated in the interior surrounded by external cracks and reinforcing bars.

The crack-inducing water-stopping member is a long member having a cross-sectional shape of τ-shape, and a hole penetrating in the longitudinal direction of the long member is formed in the base of the convex portion of the T-shape.

One or two or more openings are provided in a flat surface forming a T-shaped flat portion to communicate the hole and the outside, and at least a part or all of the surface other than the opening of the flat surface is in contact with the concrete. A member covered with a coating layer of an adhesive material having excellent adhesion, wherein the crack-inducing water-stopping member is placed in the vicinity of a reinforcing bar inside the concrete frame so that the convex portion of the member faces the outer surface of the concrete frame. Arranged,

Do not hold the hole in the crack-inducing water-stopping member and the outside of the concrete body in a state where they can communicate with each other.

This is a crack-induced water stop method.

[2] The diameter of the hole is enlarged at one end in the longitudinal direction of the crack-inducing water stop member, and an annular protrusion that can be inserted into the enlarged hole is provided at the other end. The crack-induced water stop method according to item 1.

[3] The crack-induced waterstop method according to claim 1 or 2, wherein the opening is one or more slits or one or more small holes.

[4] The crack according to any one of claims 1 to 3, wherein the opening is covered with a mesh sheet or paper that allows water-stopper to pass through but does not pass through uncured concrete. Induced water stop method.

[5] In the central part of the concrete frame surrounded by the reinforcing bars, before placing the concrete, 5. The crack-induced waterstop method according to any one of claims 1 to 4, wherein an internal crack-inducing body is disposed in parallel with the crack-induced waterstop member.

[6] An internal crack inducer promoting body is arranged in parallel with the crack-inducing water-stopping member before placing the concrete at a position facing the crack-inducing water-stopping member inside the concrete frame surrounded by reinforcing bars. The crack-induced waterstop method according to any one of claims 1 to 5.

[7] A crack-induced water stop structure for a concrete structure including a reinforcing bar and a crack-induced water stop member.

The crack-inducing water-stopping member is a long member having a T-shaped cross section, and a hole for injecting a water-stopping agent penetrating in the longitudinal direction of the long member is formed at the base of the convex portion of the T-shaped. 1 or 2 or more openings are provided on the flat surface forming at least the T-shaped flat portion to communicate the hole with the outside, and at least a part of the surface other than the opening of the flat surface. Or it is a member that is entirely covered with a coating layer of adhesive material with excellent adhesion to concrete,

Crack-induced water stop structure.

[8] The diameter of the hole is enlarged at one end in the longitudinal direction of the crack-inducing water stop member, and an annular protrusion that can be inserted into the enlarged hole is provided at the other end. The crack-induced water stop structure according to item 7.

[9] The crack-induced waterstop structure according to claim 7 or 8, wherein the opening is one or more slits or one or more small holes.

[10] The opening according to any one of claims 7 to 9, wherein the opening is covered with a mesh sheet or paper that allows water-stopper to pass through but does not pass through uncured concrete. Crack-induced water stop structure.

[11] A crack-inducing water stop member in an inner central portion of the concrete frame surrounded by a reinforcing bar The crack-induced waterstop structure according to any one of claims 7 to 10, wherein an internal crack-inducing body is disposed in parallel with the inner surface.

12. The internal crack inducing body promoting body is arranged in parallel with the crack inducing water stopping member at a position facing the crack inducing water stopping member inside the concrete frame surrounded by reinforcing bars. The crack-induced waterstop structure according to any one of items 7 to 11 of the above-mentioned range.

[13] As the concrete hardens, internal cracks are formed inside the outer wall of the concrete frame and the inside of the concrete frame surrounded by reinforcing bars, and the reinforcing bars inside the concrete frame are used to stop the water. A crack-inducing water-stopping member disposed in the vicinity, which is a long member having a cross-sectional shape of a T-shape and penetrating in the longitudinal direction of the elongate member at the base of the convex portion of the cross-shaped shape An injection hole is provided, and at least one or more openings are provided on the flat surface forming the flat portion of the T-shape to communicate the hole with the outside. A crack-inducing water-stopping member in which a part or all of the surface other than the part is covered with a coating layer of an adhesive material having excellent adhesion to concrete.

[14] The diameter of the hole is enlarged at one end in the longitudinal direction of the crack-inducing water stop member, and an annular protrusion that can be inserted into the enlarged hole is provided at the other end. The crack-inducing water-stopping member according to item 13.

[15] The crack-inducing water-stopping member according to [13] or [14], wherein the opening is one or more slits or one or more small holes.

[16] The crack according to any one of claims 13 to 15, wherein the opening is covered with a mesh sheet or paper that allows the water-stopping agent to pass therethrough but does not allow the uncured concrete to pass therethrough. Induction water stop member.