Reinforcement structure for sleeve opening and construction method of said reinforcement structure

Abstract

To provide a reinforcing jig for a sleeve opening, which can be expected to realize easy and inexpensive manufacturing as well as prevention of degradation of proof stress due to cross-sectional defects and damage due to stress concentration generated in non-structural members of buildings.SOLUTION: A reinforcing jig 1 comprises: a cylindrical portion 11 inserted into a sleeve opening S; a flange-shaped portion 12 bonded to a surface of a non-structural wall W around an opening end Sa of the sleeve opening S with an epoxy resin adhesive or the like; and an injection port portion 13 provided through a side surface 11a of the cylindrical portion for injecting a grout material that fills a gap G between the sleeve opening S and the cylindrical portion 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for reinforcing a sleeve opening that occurs in a member due to the installation of a sleeve required for a reinforced concrete building, for example. Structure and construction method of said reinforcement structure Regarding. [Background technology]

[0002] Conventionally, in the construction of apartment buildings and the like, before pouring concrete to form structural members such as pillars and beams, sleeves for piping and wiring have been placed so as not to interfere with existing reinforcing bars. As a result, through holes (hereinafter also referred to as "sleeve openings") are created in the structural members by the sleeves, reinforcing bars have also been buried in order to prevent cracks and the like caused by a decrease in shear strength and bending strength (see, for example, Patent Document 1).

[0003] On the other hand, when a sleeve opening is to be opened in a structural member by core drilling in response to a change in the position or addition of piping and wiring after pouring the above-mentioned concrete, since reinforcing steel bars cannot be embedded in advance, a technique has been disclosed in which reinforcing steel bars are embedded from the surface of the structural member using polymer cement mortar or the like that exhibits the same rigidity and strength as concrete (see, for example, Patent Document 2). With this technique, it is possible to expect the same effect as when reinforcing steel bars are embedded in advance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-146474 [Patent Document 2] JP 2005-320687 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, Patent Document 2 is intended for structural members, and is not suitable for non-structural members, including walls that have the same structure as the structural members but have larger openings for entrances and exits, etc. In other words, depending on the location and size of the sleeve opening to be re-drilled in the non-structural member, not only the non-structural member may be subject to cracks, but also adverse effects such as cutting of existing reinforcing bars, exposure of the reinforcing bars, and insufficient thickness (cover thickness) from the reinforcing bars to the surface of the concrete.

[0006] In recent years, in older apartment buildings, sleeve openings have been reopened in the walls of nonstructural components in response to, for example, the addition of air intakes, the addition of bath reheating functions, and the replacement of water heaters.However, in apartment buildings that do not have buffer materials (earthquake-resistant slits) at the boundaries between structural and nonstructural components, nonstructural components are susceptible to deformation due to shear forces and bending moments caused by earthquakes, and measures are required to prevent cross-sectional defects and stress concentrations associated with sleeve openings.

[0007] In addition, the reinforcing steel bars disclosed in Patent Documents 1 and 2 are not only difficult to manufacture due to their complex structure, sleeve It is difficult to expect any effect other than preventing cracks at the opening edges of openings, so it is difficult to expect cost-effectiveness. sleeve As a countermeasure against openings, the structure is easy to manufacture and install. sleeve Cost-effectiveness should be improved by reinforcing more than just the open ends of the openings.

[0008] Therefore, the object of the present invention is to prevent the reduction in strength and damage due to stress concentration caused by cross-sectional defects in non-structural members of buildings, and to provide a reinforcement method for sleeve openings that can be easily and inexpensively manufactured and constructed. Structure and construction method of said reinforcement structure The purpose of this invention is to provide [Means for solving the problem]

[0009] That is, the present invention relates to a sleeve opening provided in a non-structural member of a building. Reinforcement structureThe sleeve has a cylindrical portion that is inserted into the sleeve opening, a flange portion that is bonded to the surface of the non-structural component around the opening end of the sleeve opening, and an injection port portion that penetrates the flange portion and / or the cylindrical portion at a position that leads to the gap for injecting grout material to fill the gap between the sleeve opening and the cylindrical portion.

[0010] The injection port is desirably provided on a side surface of the cylindrical portion at a position leading to the gap.

[0011] The injection port is desirably provided at a position leading to the gap, near the open end of the sleeve opening in the flange.

[0012] The flange portion is provided at one of the open ends of the cylindrical portion. only It is desirable that such a system be established.

[0013] The flange portion has a first flange portion located on one side of the open end of the cylindrical portion and a second flange portion located on the other side, and it is desirable that the width of the first flange portion and the second flange portion be smaller than the width of the first flange portion when the second flange portion is not present.

[0014] The present invention also relates to the above-mentioned Reinforcement structure construction method The cylindrical portion is inserted into the sleeve opening, the flange portion is adhered to the surface of the non-structural member around the open end of the sleeve opening, and clout material is injected from the injection port portion to fill the gap between the sleeve opening and the cylindrical portion. Effect of the Invention

[0015] Reinforcement of sleeve opening in the present invention Structure and construction method of said reinforcement structure According to this, it is expected that not only will it be possible to prevent a decrease in strength due to cross-sectional defects in non-structural components of a building and damage due to stress concentration, but it will also be possible to realize easy and inexpensive manufacturing and construction. [Brief description of the drawings]

[0016] [Figure 1]1A to 1C are diagrams showing the state before and after a reinforcing jig is attached to a non-structural wall in one embodiment of the present invention. [Diagram 2] 1A to 1C are diagrams showing the process of attaching the reinforcing jig to a non-structural wall. [Diagram 3] FIG. 13 is a diagram showing a state in which another reinforcing jig is attached to a non-structural wall in one embodiment of the present invention. [Figure 4] 13A shows a state before another reinforcing jig in one embodiment of the present invention is attached to a non-structural wall, and FIG. 13B shows a state after being attached to the non-structural wall. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, with reference to Figs. 1 to 4, reinforcement of a sleeve opening in an embodiment of the present invention will be described. Structure and construction method of said reinforcement structure In these figures, when there are multiple identical parts, only one part is numbered. For the sake of convenience, certain parts and lines leading to these parts are shown with hidden lines (broken lines) or imaginary lines (two-dot chain lines), and cross sections are shown with hatching.

[0018] <Prerequisites for this reinforcement jig> FIG. 1 shows a sleeve opening provided in a non-structural member of a building according to an embodiment of the present invention. Forming a reinforcing structure This is a reinforcement jig 1 (hereinafter also referred to as "this reinforcement jig 1"). The "building" is, for example, a room in an apartment building, and can be anything as long as it has non-structural members, and can have earthquake-resistant slits or not, but it is easier to expect the desired effect when it does not have such slits.

[0019] "Non-structural members" are non-structural walls such as ceiling materials, floor materials, partition walls, ALC (Autoclaved Light Weight Concrete) exterior walls, EPC (Extruded Cement Panel) exterior walls, and reinforced concrete exterior walls with large openings for entrances and exits, other than structural members such as columns, girders, beams, and floor slabs. "Sleeve openings" have an opening diameter of 50mm to 200mm, and may be outside this range depending on the purpose, and there are no restrictions on the length or opening method.

[0020] <Outline of this reinforcement jig> As shown in Figure 1, the reinforcement jig 1 comprises a cylindrical portion 11 inserted into the sleeve opening S, a flange portion 12 adhered to the surface of the non-structural wall W around the opening end Sa of the sleeve opening S with an epoxy resin adhesive or the like, and an injection port portion 13 and an unnumbered air port provided by penetrating the flange portion 12 and / or the cylindrical portion 11 at a position leading to the gap G for injecting grout material to fill the gap G between the sleeve opening S and the cylindrical portion 11; specifically, the injection port portion 13 is provided on the side surface 11a of the cylindrical portion 11 at a position leading to the gap G.

[0021] According to this configuration, the cylindrical portion 11 and the flange-shaped portion 12 provide a countermeasure against cross-sectional defects and stress concentration associated with the entire sleeve opening S. That is, the grout material hardened in the cylindrical portion 11 and the gap G supports the nonstructural wall W from the inside of the sleeve opening S, so that not only can the deformation of the nonstructural wall W be prevented, but also the effect of preventing a reduction in strength due to the cutting of existing reinforcing bars or insufficient covering thickness, and the corrosion of reinforcing bars exposed by the cutting can be expected. In addition, since the flange-shaped portion 12 follows the deformation of the surface of the nonstructural wall W around the opening end Sa of the sleeve opening S, the effect of avoiding cracks can be expected. Furthermore, since the grout material can be injected from the inside of the cylindrical portion 11 through the injection port portion 13, the effect of shortening the construction time can be expected.

[0022] Here, the flange portion 12 may be a separate body that can be attached and detached from the cylindrical portion 11, but it is preferable that the flange portion 12 is attached to one of the open ends 11b of the cylindrical portion 11. onlyWhen the flange portion 12 is integrally formed by welding or molding, it is easy to handle as a jig, and the flange portion 12 can be positioned simply by inserting the cylindrical portion 11 into the sleeve opening S, which is expected to further reduce the construction time.

[0023] <Details of this reinforcement jig> The cylindrical portion 11 and the flange portion 12 may be made of steel, and there is no limitation on the material as long as the desired effect can be obtained. The cylindrical portion 11 may be a sleeve or a member separate from the sleeve. The cylindrical portion 11 may have the same length as the sleeve opening S or may be longer than the length of the sleeve opening S by the thickness of the flange portion 12, and there is no limitation on the dimensions such as length and thickness as long as the desired effect can be obtained.

[0024] The flange-like portion 12 is a donut-shaped plate material with an opening having a diameter equal to the sleeve opening S or the opening diameter of the cylindrical portion 11, and may be circular, elliptical, or rectangular in plan view. As long as it protrudes perpendicular to the cylindrical portion 11 and the desired effect can be obtained, there are no limitations on the shape, length, thickness, and other dimensions of the flange-like portion 12.

[0025] The injection port 13 has an opening diameter according to the injection amount of grout material and the nozzle diameter of the injection equipment, and there are no limitations on the shape, number, location, or dimensions as long as the desired effect is obtained. The air ports not numbered may be of different or equal specifications to the injection port 13, and the injection port 13 may also be used as the air port.

[0026] The gap between the sleeve opening S and the side surface 11a of the cylindrical portion 11 is 3 mm to 5 mm. In other words, the outer diameter of the cylindrical portion 11 is 3 mm to 5 mm smaller than the opening diameter of the sleeve opening S. If it is less than 3 mm, it becomes difficult to insert the cylindrical portion 11 due to protrusions from the inner surface of the sleeve opening S, including the exposed rebar, and if it exceeds 5 mm, too much grout material will be injected, but it may exceed 5 mm depending on the size of the sleeve opening S.

[0027] The grout material is preferably a cement-based material rather than a resin, due to the influence of the heat of hot water supply and the addition of alkalinity to exposed reinforcing bars, and is expected to have the effect of preventing corrosion of the reinforcing bars. There are no restrictions on the ingredients or amount as long as the desired effect is obtained.

[0028] <Book Construction Method flow> FIG. 2 shows the reinforcement of the sleeve opening shown in FIG. Construction method of the structure (Hereinafter referred to as “book” Construction 1 shows the flow of the reinforcement jig 1 and the nonstructural wall W in cross section.

[0029] First, as shown in FIG. 2(a), the open end side of the cylindrical portion 11 of the present reinforcing jig 1, where the flange portion 12 is not provided, was cut by core-cutting the nonstructural wall W. sleeve Insert it into the opening S. At this time, sleeve The inner surface of the opening S may have exposed ends of existing reinforcing bars (not shown) that were cut off during core drilling, and if the exposed ends are long enough to prevent the cylindrical portion 11 from being inserted, the ends may be cut or ground before the cylindrical portion 11 is inserted.

[0030] Next, as shown in FIG. 2(b), the flange portion 12 is bonded to the surface of the non-structural wall W around the opening end Sa of the sleeve opening S with an epoxy resin adhesive (not shown). sleeve It may be placed on the inner surface of the opening S. In other words, sleeve The gap between the opening S and the cylindrical portion 11 may not be uniform in width all around the circumference, and the vertical position of the reinforcing jig 1 is not limited as long as the desired effect can be obtained. The flange portion 12 may be embedded in polymer cement mortar or the like to make it invisible.

[0031] Then, as shown in FIG. 2(c), grout material is injected at low pressure from the injection ports 13, 13 to fill the gap G between the sleeve opening S and the cylindrical portion 11. The grout material is sleeve The gap G corresponding to the cylindrical portion 11 relative to the opening S may be filled. In other words, sleeve It may be thicker at the opening S and at a part in the circumferential direction of the cylindrical portion 11. When there are two or more injection ports 13, a small amount of grout material may be injected from each port so that no cavity remains in the gap G. To prevent air pockets from forming, the injection ports 13 may be located at the bottom of the cylindrical portion 11 and the air port at the top.

[0032] According to this method, the nonstructural wall W is cored out and sleeve It is expected that the entire process from opening the opening S to attaching the reinforcing jig 1 to the nonstructural wall W and injecting grout into the gap G can be completed in one day. In other words, since the manufacturing and handling of the reinforcing jig and the above work are not complicated, even non-experts can easily carry out the work, and it is easy to allocate workers. In addition, the above work can be carried out from both the indoor and outdoor sides of the building. If it is carried out from the indoor side, it is possible to reduce the labor required to remove the coating on the outdoor side of the nonstructural wall and to prevent the reinforcing jig from being exposed from the outdoor side of the nonstructural wall.

[0033] Next, with reference to Figures 3 and 4, another reinforcing jig in one embodiment of the present invention will be described, with only the parts that differ from those shown in Figures 1 and 2 being described, and a description of the equivalent parts will be omitted. For ease of reference, the parts or portions related to those shown in Figures 1 and 2 are numbered in Figures 3 and 4 with 100 or 200 added to the numbers in Figures 1 and 2.

[0034] 3 has a first flange portion 112a located on one side of the open end of the cylindrical portion 111 and a second flange portion 112b located on the other side, and the first flange portion 112a and the second flange portion 112b are smaller than the first flange portion 112a in the absence of the second flange portion 112b. The first flange portion 112a may be provided integrally with the cylindrical portion 111 or may be a separate body, and the second flange portion 112b may be a separate body.

[0035] According to this configuration, when the flange portion 112 is present on both sides of the non-structural wall, it is easier to ensure conformability to deformations of the non-structural wall W even if the flange portion is smaller in size than when it is present on only one side; in other words, when it is present on only one side, it is difficult to ensure the above-mentioned conformability unless the flange portion is larger in size than when it is present on both sides.

[0036] The deformation follow-up performance target rate of the nonstructural wall differs depending on the width of the flange 112 when it is on both sides and when it is on one side. "Deformation follow-up performance" refers to the ability of the nonstructural wall to deform and follow an external force without breaking, and the deformation follow-up performance target rate is set to 100% when the nonstructural wall has no sleeve opening. In other words, the lower the deformation follow-up performance target rate, the more likely the nonstructural wall is to break because it cannot fully deform to follow an external force. "Flange width" refers to the dimension obtained by subtracting the radius of the opening in the center from the radius of the flange 112.

[0037] When the flange portion 112 is on both sides of the non-structural wall, even if the width is about 2 / 3 or less than when it is on only one side, it is possible to expect the effect of ensuring a target deformation compliance rate of approximately 85% to 100%, and on the other hand, even if the width is more than about 2 / 3 or approximately the same as when it is on only one side, it is possible to expect the effect of ensuring a target deformation compliance rate of approximately 80% to 85%.

[0038] 4(a), the injection port 213 of the present reinforcement jig 201 is provided near the opening edge 212a of the flange portion 212 so as to be in communication with the gap G, in other words, is provided so as to be located outside the side surface 211a of the cylindrical portion 211. The injection port 213 may be circular or semicircular in plan view. The injection port 213 is provided on the lower side of the flange portion 212, but may be on the upper side or on the left or right side, and may be one or more than one, and the upper side may be an air port not numbered.

[0039] As shown in FIG. 4(b), grout material may be injected at low pressure from the injection port 213 to fill the gap G between the sleeve opening S and the cylindrical portion 211, and air may be evacuated from the upper air port to avoid air pockets. [Explanation of symbols]

[0040] W Non-structural wall S sleeve opening Sa Sleeve opening end G Gap 1, 101, 201 Reinforcement jig 11, 111, 211 Cylindrical part 11a, 211a Cylindrical part side 12, 112, 212 collar 212a Opening edge of flange 13 Inlet section

Claims

1. A reinforcing structure for a sleeve opening provided in a non-structural member of a building, comprising: A cylindrical portion that is inserted into the sleeve opening; a flange bonded to a surface of the nonstructural member around an open end of the sleeve opening; An injection port portion provided through the cylindrical portion at a position leading to the gap for injecting a grout material to fill the gap between the sleeve opening and the cylindrical portion, The injection port is provided on a side surface of the cylindrical portion at a position leading to the gap. A reinforcing structure for a sleeve opening.

2. The flange portion is provided only on one of the open ends of the cylindrical portion. The reinforcing structure for a sleeve opening according to claim 1 .

3. A method for constructing the reinforcement structure according to claim 1 or 2, Inserting the cylindrical portion into the sleeve opening; Adhering the flange to a surface of the nonstructural member around an open end of the sleeve opening; A clout material is injected from the injection port to fill the gap between the sleeve opening and the cylindrical portion. A method for constructing a reinforcing structure for a sleeve opening, comprising:

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