Construction method of exterior building material support structure

Abstract

At least one embodiment of the present disclosure provides a construction method for an exterior building material support structure that can provide an exterior building material support structure with ensured waterproofness in a short construction period. 【Solution means】A construction method for an exterior building material support structure that supports exterior building materials partitioning between the inside and outside of a building includes a support member fixing step of fixing a support member to support concrete so that at least a part of the support member extends upward from the support concrete, an exterior building material attaching step of attaching an exterior building material to the support member, and a vertical upper part forming step of placing a vertical upper part formed of waterproof mortar in a first gap between the support concrete and the exterior building material.

Description

Technical Field

[0001] The present disclosure relates to a construction method of an exterior building material support structure.

Background Art

[0002] Conventionally, a support structure for a balcony sash has been known. The support structure includes slab concrete, a standing portion rising from the slab concrete, and a balcony sash installed on the standing portion. The standing portion has a waterproof function of preventing water such as rain from entering the indoor side of the balcony sash. Therefore, if the standing portion is integral with the slab concrete, high waterproof performance is expected.

[0003] However, from the viewpoint of shortening the construction period of a building, it is preferable that the standing portion is separate from the slab concrete. If the standing portion is integrated with the slab concrete, it is necessary to use a floating formwork for forming the standing portion, and undulations occur on the standing portion after casting. As a result, the construction period is prolonged by the man-hours required for repairing the standing portion with undulations.

[0004] For example, when constructing a high-rise condominium, the work of installing the main structures such as columns, beams, floors, and balconies is periodically repeated floor by floor. If the standing portion is integrated with the slab concrete, the man-hours (cycle days) required per floor become longer for the above reasons. The influence of such an increase in man-hours becomes greater as the number of floors of the high-rise condominium increases. Therefore, as in Patent Document 1, it is preferable that the slab concrete and the standing portion are configured separately.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, if the slab concrete and the vertical upper part are configured separately, water such as rainwater easily enters between them, and there is a concern about water leakage into the room. If we try to ensure the waterproof function that the vertical upper part should originally perform, the construction period of the building may be prolonged as the man-hours required for the construction of the vertical upper part increase.

[0007] An object of the present disclosure is to provide a construction method for an exterior building material support structure that can provide an exterior building material support structure with ensured waterproofness in a short construction period.

Means for Solving the Problems

[0008] 1) The construction method of an exterior building material support structure according to at least one embodiment of the present disclosure is A construction method for an exterior building material support structure that supports an exterior building material partitioning the inside and outside of a building, A support member fixing step of fixing the support member to the support concrete so that the support member extends upward from the support concrete, for supporting the exterior building material; An exterior building material attachment step of attaching the exterior building material to the support member; A vertical upper part placing step of placing a vertical upper part formed of waterproof mortar in a first gap between the support concrete and the exterior building material; and includes.

[0009] If an exterior building material is to be installed on the vertical upper part after placing the vertical upper part on the support concrete, the installation of the exterior building material on the vertical upper part may be difficult due to the undulation generated on the vertical upper part. Therefore, the man-hours required for the repair work of the undulation of the vertical upper part are necessary before installing the exterior building material. In this regard, according to the construction method of 1) above, since the exterior building material is attached to the support member fixed to the support concrete, the vertical portion can be placed in the first gap between the support concrete and the exterior building material. Since the vertical portion is formed of waterproof mortar, the waterproof property of the exterior building material support structure is ensured. Therefore, an exterior building material support structure with ensured waterproof property can be provided without performing repair work on the vertical portion, and the construction period of the building can be shortened.

[0010] 2) In some embodiments, it is a construction method of the exterior building material support structure described in 1) above, when the direction in which the vertical portion extends is defined as the first direction, it further includes a waterproof sealant installation step of installing a waterproof sealant along the first direction on the support concrete before the vertical portion placing step.

[0011] According to the construction method of 2) above, since the waterproof sealant is installed along the first direction on the support concrete before the vertical portion placing step, the waterproof sealant can be embedded between the support concrete and the vertical portion. By installing the waterproof sealant, it becomes difficult for water to penetrate indoors from between the support concrete and the vertical portion. Therefore, an exterior building material support structure with further improved waterproof property can be provided.

[0012] 3) In some embodiments, it is a construction method of the exterior building material support structure described in 2) above, the waterproof sealant includes a first portion that is installed between the support concrete and the vertical portion and extends along the first direction, and a second portion that rises from an end of the first portion in the first direction and extends along a side surface of an adjacent structure. and

[0013] According to the construction method of 3) above, in the waterproof sealant installation step, the waterproof sealant (the first part and the second part) is installed on the support concrete and on the side surface of the adjacent structure. Therefore, it is difficult for water to enter the room from between the support concrete and the upright part, and between the upright part and the structure. Thus, an exterior building material support structure that can prevent water from entering the room even if water accumulates outdoors can be provided.

[0014] 4) In some embodiments, it is a construction method of the exterior building material support structure described in any one of 1) to 3) above, In the upright part placing step, the upright part is placed so that a second gap that opens outdoors is formed between the upright part and the exterior building material, Further comprising a waterproof seal installation step of arranging a waterproof seal in the second gap between the upright part and the exterior building material.

[0015] According to the construction method of 4) above, in the upright part placing step, the upright part is placed so that a second gap that opens outdoors is formed between the upright part and the exterior building material. Then, in the waterproof seal installation step, a waterproof seal is arranged in the second gap formed by performing the upright part placing step. Since the waterproof seal is arranged in the second gap, it is difficult for water to enter the room from between the exterior building material and the upright part. Thus, an exterior building material support structure with better waterproof performance can be provided.

[0016] 5) In some embodiments, it is a construction method of the exterior building material support structure described in any one of 1) to 4) above, The upright part has an outdoor side surface that rises from the support concrete and is oriented outdoors, Comprising a first waterproof film pasting step of pasting a first waterproof film on the outdoor side surface.

[0017] According to the construction method of 5) above, in the first waterproof film pasting step, the first waterproof film is pasted on the outdoor side surface of the vertical upper part. Therefore, it is difficult for water to penetrate indoors from between the support concrete and the vertical upper part, so that an exterior building material support structure with better waterproof performance can be provided.

[0018] 6) In some embodiments, it is a construction method of the exterior building material support structure described in any one of 1) to 3) above, The vertical upper part placing step includes: a main body part placing step of placing a main body part having an indoor side surface rising from the support concrete and oriented indoors; an additional part placing step of placing an additional part having an outdoor side surface rising from the support concrete and oriented outdoors; and between the main body part placing step and the additional part placing step, it further includes a second waterproof film pasting step of pasting a second waterproof film on the upper surface of the support concrete and the outdoor side surface of the main body part.

[0019] According to the construction method of 6) above, in the main body part placing step, the main body part is placed so as to have an indoor side surface. Then, in the second waterproof film pasting step, the second waterproof film is pasted on the outdoor side surface of the main body part. And in the additional part placing step, the additional part is placed so as to have an outdoor side surface. Therefore, at least a part of the second waterproof film can be embedded between the main body part and the additional part, and between the additional part and the support concrete. It is difficult for water to penetrate indoors from between the support concrete and the vertical upper part, so that an exterior building material support structure with better waterproof performance can be provided.

[0020] 7) In some embodiments, it is a construction method of the exterior building material support structure described in any one of 6) above, In the additional part placing step, the additional part is placed so that a second gap opening outdoors is formed between the additional part and the exterior building material. The waterproof seal installation step of installing a waterproof seal in the second gap between the additional part and the exterior building material is further provided.

[0021] According to the construction method of 7) above, in the additional part placing step, the additional part is placed so as to form a second gap that opens outdoors between the additional part and the exterior building material. Then, in the waterproof seal installation step, a waterproof seal is disposed in the second gap formed by performing the additional part placing step. Since the waterproof seal is disposed in the second gap, it becomes difficult for water to enter indoors from between the exterior building material and the main body part. Therefore, an exterior building material support structure with improved waterproof performance can be provided.

[0022] 8) In some embodiments, it is a construction method of the exterior building material support structure according to any one of 6) or 7) above, The first waterproof film pasting step of pasting a first waterproof film on the outdoor side surface of the additional part is further provided.

[0023] According to the construction method of 8) above, in the first waterproof film pasting step, the first waterproof film is pasted on the outdoor side surface of the additional part. Therefore, it becomes difficult for water to enter indoors from between the support concrete and the additional part, so an exterior building material support structure with improved waterproof performance can be provided.

Effect of the Invention

[0024] According to the present disclosure, a construction method of an exterior building material support structure that can provide an exterior building material support structure with ensured waterproof performance in a short construction period can be provided.

Brief Description of the Drawings

[0025]

Figure 1

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Figure 9

Figure 10

Mode for Carrying Out the Invention

[0026] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure, but are merely illustrative examples. For example, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only strictly represent such arrangements, but also represent a state in which there are tolerances or relative displacements with angles and distances that can obtain the same function. For example, expressions indicating that things such as "identical", "equal", and "homogeneous" are in an equal state shall represent not only a strictly equal state, but also a state in which there are tolerances or differences to the extent that the same function can be obtained. For example, expressions representing shapes such as a rectangular shape or a cylindrical shape shall represent not only the shapes such as a rectangular shape or a cylindrical shape in a geometrically strict sense, but also shapes including concave and convex portions, chamfered portions, etc. within the range where the same effect can be obtained. On the other hand, the expressions "comprising", "including", or "having" for one component are not exclusive expressions excluding the existence of other components. Note that the same reference numerals may be given to the same configurations and the description may be omitted.

[0027] First, with reference to FIGS. 1 to 3, the configuration of the exterior building material support structure 1 according to some embodiments will be described. Hereinafter, the exterior building material support structure 1 may be abbreviated as the "support structure 1".

[0028] FIG. 1 is a schematic view of the exterior building material support structure 1 according to the first embodiment. The exterior building material support structure 1 supports an exterior building material 2 that partitions the inside and outside of a building 9 that may be, for example, a high-rise condominium. The exterior building material 2 in this embodiment is a balcony sash. In FIG. 1, the left side of the exterior building material 2 is the outdoor side of the building 9 and the right side is the indoor side.

[0029] The support structure 1 includes a support concrete 3 that is slab concrete or beam concrete, and a standing portion 4 that rises from the support concrete 3. The support concrete 3 may be slab concrete or beam concrete. The standing portion 4 installed on the support concrete 3 extends in a first direction (the front-rear direction of the paper in FIG. 1) along the horizontal direction and supports the exterior building material 2. The standing portion 4 includes an outdoor side surface 41a that is a side surface oriented toward the end surface facing the outdoor side, and the outdoor side surface 41a rises from the support concrete 3. Note that the standing portion 4 includes an indoor side surface 41b that is a side surface oriented toward the indoor side, and the indoor side surface 41b rises from the support concrete 3.

[0030] In this embodiment, the upright upper part 4 is formed of mortar containing a waterproofing agent (i.e., waterproof mortar). This waterproofing agent is a cement-modified type admixed waterproofing agent that imparts water repellency to the mortar. The ratio of the waterproofing agent to the mortar is, for example, 1% or more and 10% or less by weight, preferably 2% or more and 6% or less. According to the inventor's findings, if the ratio is less than 1%, the waterproofness of the mortar decreases, and if it exceeds 10%, the strength of the mortar decreases.

[0031] The waterproof mortar is configured to have a water permeability ratio of 70% or less with respect to the water permeability test of non-mixed mortar. This enhances the waterproofness of the waterproof mortar. The water permeability test is conducted in accordance with the "Test Method for Cement Waterproofing Agents for Building" specified in JIS-A-1404 (2015). The water pressure for the water permeability test is 3.0×10 5 Pa, and the time for applying the water pressure is 1 hour.

[0032] The above-mentioned waterproofing agents include inorganic and organic types. The inorganic types include calcium chloride-based, sodium silicate-based, silica-based, etc., and the organic types include higher fatty acids such as higher fatty acid-based and higher fatty acid salts.

[0033] The support structure 1 illustrated in FIG. 1 further includes a waterproof sealing material 5 installed between the support concrete 3 and the upright upper part 4. The waterproof sealing material 5 includes an elastic body, a plastic body, or a viscous body having waterproof performance. The waterproof sealing material 5 in this example is a butyl seal extending in the first direction. Here, a horizontal direction orthogonal to the first direction is defined as the second direction. The second direction corresponds to the left-right direction in FIG. 1 and also corresponds to the width direction of the waterproof sealing material 5.

[0034] FIG. 2 is a schematic cross-sectional view of the exterior building material support structure 1 viewed from the second direction. In FIG. 2, a cross-section of the support structure 1 cut at the position of the waterproof sealing material 5 is shown. In FIG. 2, the first direction corresponds to the left-right direction, the second direction corresponds to the front-back direction of the paper, and the height direction corresponds to the up-down direction. As shown in FIG. 2, the support structure 1 is adjacent to the structure 200 in the second direction. Note that the structure 200 is not particularly limited and may be, for example, an outer wall or a column of the building 9.

[0035] As shown in FIG. 3, the waterproof sealing material 5 includes a first portion 51 extending along the first direction and a second portion 53 rising from an end portion 52 of the first portion 51 in the second direction. The second portion 53 extends along the height direction.

[0036] The first portion 51 is installed between the support concrete 3 and the standing portion 4. In the embodiment illustrated in FIG. 2, the end portion 52 of the first portion 51 is provided to contact the side surface 202 of the structure 200 adjacent to the exterior building material support structure 1.

[0037] The second portion 53 extends along the side surface 202 of the structure 200 adjacent to the exterior building material support structure 1. In the embodiment shown in FIG. 2, the second portion 53 rises from both end portions 52 of the first portion 51. In other embodiments, the second portion 53 rises from one end portion 52 of the first portion 51.

[0038] When the height of the standing portion 4 is H, it is preferable that the height h' of the second portion 53 satisfies the condition of 0.25 ≦ h' / H ≦ 1. By the height h' of the second portion 53 satisfying the above conditions, even if water accumulates outdoors in the building 9, the intrusion of water into the room can be effectively prevented.

[0039] Returning to FIG. 1, the support structure 1 further includes a waterproof seal 19 installed between the standing portion 4 and the exterior building material 2 and arranged facing the outdoors. The waterproof seal 19 extends in the first direction. The waterproof seal 19 includes an elastic body, a plastic body, or a viscous body having waterproof performance. The waterproof seal 19 is a urethane seal or a silicone seal.

[0040] The upper end of the outdoor side surface 41a of the vertical upper part 4 is located at a lower position than the lower surface 2c of the exterior building material 2. The vertical upper part 4 further has a surface 41e located on the indoor side of the outdoor side surface 41a, and a surface 41f connecting the upper end of the outdoor side surface 41a and the lower end of the surface 41e.

[0041] The waterproof seal 19 has a side surface 19a oriented toward the outside, a side surface 19b located on the indoor side of the side surface 19a, and a surface 19c connecting the lower end of the side surface 19a and the lower end of the side surface 19b. The side surface 19a of the waterproof seal 19 is oriented so as to be continuous with the outdoor side surface 41a of the vertical upper part 4. Also, the side surface 19a of the waterproof seal 19 is oriented so as to be continuous with the outdoor side surface 2a of the exterior building material 2. The side surface 19b of the waterproof seal 19 faces the surface 41e of the vertical upper part 4. The surface 19c of the waterproof seal 19 faces the surface 41f of the vertical upper part 4.

[0042] In some embodiments, as shown in FIG. 1, the lower end of the side surface 19a of the waterproof seal 19 is located below the lower end of the side surface 19b. That is, the surface 19c of the waterproof seal 19 is inclined downward as it goes from the side surface 19b to the side surface 19a.

[0043] As shown in FIG. 1, the support structure 1 further includes a support concrete 3 and a first waterproof film 10 attached to the vertical upper part 4. The first waterproof film 10 is a polyurethane-based seal extending in a first direction. The first waterproof film 10 is composed of a first horizontal attachment part 11 and a first vertical attachment part 12.

[0044] The first horizontal attachment part 11 is attached to the upper surface 31 of the support concrete 3. The first vertical attachment part 12 rises from the first horizontal attachment part 11 and is attached to the outdoor side surface 41a of the vertical upper part 4. However, the first waterproof film 10 may not include the first horizontal attachment part 11. Also, instead of being an attached type seal, the first waterproof film 10 may be formed by solidifying a liquid waterproof agent.

[0045] In some embodiments, as shown in FIG. 1, the upper end of the first rising attachment portion 12 is attached to the height position of the lower surface 2c of the exterior building material 2. In other embodiments, the upper end of the first rising attachment portion 12 may be attached to the outdoor side surface 2a of the exterior building material 2 above the height position of the lower surface 2c of the exterior building material 2.

[0046] In some embodiments, as shown in FIG. 1, the first rising attachment portion 12 is attached to the outdoor side surface 41a of the rising portion 4 and the side surface 19a of the waterproof seal 19.

[0047] FIG. 3 is a schematic view of the exterior building material support structure 1 according to the second embodiment. In FIG. 3, the same reference numerals are given to the same components as in FIG. 1. The support structure 1 further includes a second waterproof film 20 disposed on the outdoor side of the waterproof sealant 5. The second waterproof film 20 includes a second horizontal attachment portion 21 and a second rising attachment portion 22. The second horizontal attachment portion 21 is attached to the upper surface 31 of the support concrete 3 between the support concrete 3 and the rising portion 4. Also, a part of the second horizontal attachment portion 21 is disposed on the outdoor side of the rising portion 4 and is interposed between the first horizontal attachment portion 11 and the support concrete 3. That is, the first horizontal attachment portion 11 according to the second embodiment is attached to the upper surface 31 of the support concrete 3 via the second horizontal attachment portion 21. The second rising attachment portion 22 rises from the second horizontal attachment portion 21 and extends along the vertical direction inside the rising portion 4. A part of the second rising attachment portion 22 is attached to the side surface 19b of the waterproof seal 19. The second waterproof film 20 may be formed by solidifying a liquid waterproof agent instead of being a sticking type seal.

[0048] In some embodiments, as shown in FIG. 3, the upright upper portion 4 includes a main body portion 42 having an indoor-side side surface 42b (41b) oriented toward the interior of the building, and an additional portion 43 having an outdoor-side side surface 43a (41a) oriented toward the exterior of the building. The main body portion 42 further has a side surface 42a located on the outdoor side of the indoor-side side surface 42b (41b). The additional portion 43 further has a side surface 43b located on the indoor side of the outdoor-side side surface 43a (41a), and a surface 43f (41f) connecting the upper end of the outdoor-side side surface 43a (41a) and the upper end of the side surface 43b. The surface 43f of the additional portion 43 is located below the lower surface 2c of the exterior building material 2. In the embodiment shown in FIG. 3, the second upright attachment portion 22 is located between the side surface 42a of the main body portion 42 and the side surface 43b of the additional portion 43. In the embodiment illustrated in FIG. 3, the second upright attachment portion 22 is located between the side surface 42a of the main body portion 42, the side surface 43b of the additional portion 43, and the side surface 19b of the waterproof seal 19.

[0049] In some embodiments, the first waterproof film 10 and the second waterproof film 20 are made of different materials. The first waterproof film 10 and the second waterproof film 20 are each made of materials having different properties other than waterproofness. Since the first waterproof film 10 is exposed to sunlight and rainfall, high waterproofness and weather resistance are required. Therefore, the first waterproof film 10 is preferably, for example, a urethane-based coating film. The second waterproof film 20 is required to have high adhesiveness and durability with the waterproof mortar of the upright upper portion 4. Therefore, the second waterproof film 20 is preferably, for example, a polymer cement-based coating film.

[0050] Subsequently, with reference to FIGS. 4 to 10, a construction method of an exterior building material support structure according to some embodiments for constructing the above-described exterior building material support structure 1 will be described. FIG. 4 is a flowchart for explaining a construction method of an exterior building material support structure according to an embodiment. FIG. 5 is a flowchart for explaining a construction method of an exterior building material support structure according to another embodiment. FIG. 6 is a schematic cross-sectional view of a structure obtained by the procedures up to the exterior building material attachment step in the construction method of the exterior building material support structure according to one embodiment. FIG. 7 is a schematic cross-sectional view of a structure obtained by the procedures up to the exterior building material attachment step in the construction method of the exterior building material support structure according to another embodiment. FIG. 8 is a schematic cross-sectional view of a structure obtained after the upper vertical part pouring step in the construction method of the exterior building material support structure according to one embodiment. FIG. 9 is a schematic cross-sectional view of a structure obtained after the main body part pouring step in the construction method of the exterior building material support structure according to another embodiment. FIG. 10 is a schematic cross-sectional view of a structure obtained by the second waterproof film attachment step and the additional part pouring step in the construction method of the exterior building material support structure according to another embodiment.

[0051] In some embodiments, as shown in FIGS. 4 and 5, a support member fixing step S10 is performed. In the support member fixing step S10, as shown in FIGS. 6 and 7, support members 7 (7A, 7B) for supporting the exterior building material 2 are fixed to the support concrete 3. At least a part of the support members 7 (7A, 7B) extends upward from the support concrete 3. That is, the support members 7 (7A, 7B) include a first portion 71 (71A, 71B) fixed to the support concrete 3 and an intermediate portion 72 (72A, 72B) extending upward from the first portion 71 (71A, 71B). Note that the fixing method of the support members 7 (7A, 7B) is not particularly limited. For example, the first portion 71 (one end portion 71A described later) of the support member 7 (support rod 7A described later) may be embedded in the support concrete 3, or the first portion 71 (71B) may be fixed to the upper surface 31 of the support concrete 3 using other known attachment techniques. Note that the support member 7 may be one support member 7 extending along the first direction in which the upper vertical part 4 extends, or a plurality of support members 7 arranged along the first direction.

[0052] After fixing the support members 7 (7A, 7B) to the support concrete 3, an exterior building material attachment step S30 is performed. In the exterior building material mounting step S30, as shown in FIGS. 6 and 7, the exterior building material 2 is mounted on the support members 7 (7A, 7B). That is, the support members 7 (7A, 7B) further include a second portion 73 (73A, 73B) to which the exterior building material 2 is mounted. The second portion 73 (73A, 73B) is located on the opposite side of the first portion 71 (71A, 71B) with the intermediate portion 72 (72A, 72B) interposed therebetween. By mounting the exterior building material 2 on the second portion 73 (73A, 73B) of the support members 7 (7A, 7B), the lower surface 2c of the exterior building material 2 is positioned higher than the upper surface 31 of the support concrete 3. Therefore, a first gap G1 is formed between the exterior building material 2 and the support concrete 3. The exterior building material 2 is mounted on the support members 7 (7A, 7B) by welding the metal portion of the exterior building material 2 and the second portion 73 (73A, 73B) of the support members 7 (7A, 7B). Note that the mounting method of the exterior building material 2 is not limited to welding, and other known mounting techniques may be used.

[0053] In the embodiment shown in FIG. 6, the support member 7 is a support rod 7A. The support rod 7A as the support member 7 includes one end portion 71A embedded in the support concrete 3 and the other end portion 73A to which the exterior building material 2 is mounted. In the support member fixing step S10, as shown in FIG. 6, the support rod 7A is fixed to the support concrete 3 by embedding one end portion 71A of the support rod 7A in the support concrete 3.

[0054] In the embodiment shown in FIG. 7, the support member 7B includes a first portion 71B fixed to the support concrete 3 and a second portion 73B to which the exterior building material 2 is mounted. The first portion 71B extends along a second direction that is a horizontal direction orthogonal to the first direction. In the support member fixing step S10, as shown in FIG. 7, the first portion 71B of the support member 7B is fixed to the upper surface 31 of the support concrete 3. At this time, as illustrated in FIG. 7, the first portion 71B may be fixed to the support concrete 3 by the anchor 8. Note that the type of the anchor 8 is not particularly limited, and it may be a metal-based anchor or an adhesive anchor.

[0055] In the embodiment illustrated in FIG. 7, the support member 7B is an H-shaped steel whose cross-sectional shape viewed from the first direction is an H shape. In the H-shaped steel as the support member 7B, the second portion 73B extends along the second direction. As illustrated in FIG. 7, the exterior building material 2 is placed on the surface 73b of the second portion 73B. In other embodiments (not shown), the support member 7B is an angle steel (angle member) whose cross-sectional shape viewed from the first direction is an L shape. That is, in the angle steel as the support member 7B, the present outer portion (72B) extends upward from one end of the first portion (71B) in the second direction. In still other embodiments (not shown), the support member 7B is a T-shaped steel whose cross-sectional shape viewed from the first direction is a T shape. That is, in the T-shaped steel as the support member 7B, the main body portion (72B) extends upward from between both ends of the first portion (71B) in the second direction.

[0056] After attaching the exterior building material 2 to the support members 7 (7A, 7B), the upper vertical portion placing step S40 is performed. In the upper vertical portion placing step S40, as shown in FIGS. 8 to 10, the upper vertical portion 4 is formed in the first gap G1. The upper vertical portion 4 is formed of the waterproof mortar as described above. After filling the waterproof mortar into the first gap G1, the waterproof mortar is cured.

[0057] According to the above construction method, the upper vertical portion 4 formed of the waterproof mortar can be placed in the first gap G1 between the support concrete 3 and the exterior building material 2. Therefore, an exterior building material support structure 1 with ensured waterproof performance can be provided without performing repair work on the upper vertical portion 4, so that the construction period of the building can be shortened.

[0058] In the embodiment shown in FIG. 5, the upper vertical portion placing step S40 includes a main body portion placing step S42 for placing the main body portion 42 and an additional portion placing step S44 for placing the additional portion 43. The main body portion placing step S42 is performed after the exterior building material attaching step S30. After the main body portion placing step S42, a second waterproof film attaching step S50 described later is performed, and then the additional portion placing step S44 is performed. In the main body placing step S42, as shown in FIGS. 9 and 10, the main body 42 is placed so that the indoor side surface 42b (41b) oriented toward the indoor side is continuous with the indoor side surface 2b of the exterior building material 2. Also, in the main body placing step S42, the main body 42 is placed so that the outdoor side surface 42a of the main body 42 is located on the outdoor side of the indoor side surface 42b (41b). Further, the main body 42 may be placed so that the side surface 42a of the main body 42 is located on the outdoor side of the outdoor side end of the waterproof sealant 5 described later. In the additional part placing step S44, as shown in FIG. 10, the additional part 43 is placed so that the indoor side surface 43b of the additional part 43 is located on the outdoor side of the side surface 42a of the main body 42. Also, in the additional part placing step S44, the additional part 43 is placed so that the outdoor side surface 43a (41a) oriented toward the outdoor side is in the same second direction position as the outdoor side surface 2a of the exterior building material 2.

[0059] In the embodiment shown in FIG. 10, the additional part 43 is placed so that the upper end of the outdoor side surface 43a (41a) is located lower than the lower surface 2c of the exterior building material 2. A second gap G2 described later is formed between the additional part 43 and the exterior building material 2. In other embodiments, the additional part 43 is placed so that the outdoor side surface 43a (41a) is continuous with the outdoor side surface 2a of the exterior building material 2.

[0060] In the upright part placing steps S40 (S42, S44), it is preferable to cure the waterproof mortar with a curing period of at least 24 hours. By curing the waterproof mortar, the subsequent second waterproof film pasting step S50, waterproof seal installation step S60, or first waterproof film pasting step S70 can proceed smoothly. Furthermore, it is still more preferable to provide a curing period of two weeks after curing the waterproof mortar.

[0061] In the embodiment shown in FIG. 5, the second waterproof film pasting step S50 is performed after the main body placing step S42 and before the additional part placing step S44. In the second waterproof film attaching step S50, as shown in FIGS. 9 and 10, the second waterproof film 20 is attached to the upper surface 31 of the support concrete 3 and the outdoor side surface 42a of the main body portion 42. Specifically, the second waterproof film 20 is attached to the entire side surface 42a of the main body portion 42, and the second waterproof film 20 is attached to the upper surface 31 of the support concrete 3 so as to extend from the first gap G1 toward the outdoors. As described above, since the additional portion 43 is placed after the second waterproof film 20 is attached, at least a part of the second standing attachment portion 22 of the second waterproof film 20 is embedded between the side surface 42a of the main body portion 42 and the side surface 43b of the additional portion 43. Also, at least a part of the second horizontal attachment portion 21 of the second waterproof film 20 is embedded between the additional portion 43 and the support concrete 3. Therefore, it is difficult for water to enter the room from between the support concrete 3 and the upright portion 4, so that the exterior building material support structure 1 with improved waterproof performance can be provided.

[0062] In one embodiment, a sheet-like material may be attached to the side surface 42a of the main body portion 42 as the second waterproof film 20. By using the sheet-like material as the second waterproof film 20, the second waterproof film 20 processed into a desired shape can be prepared in advance, so that the attachment work of the second waterproof film 20 can be completed promptly. In other embodiments, the second waterproof film 20 may be formed by solidifying a liquid waterproof agent on the side surface 42a of the main body portion 42. By solidifying the liquid waterproof agent to form the second waterproof film 20, cracks generated in the main body portion 42, gaps between the exterior building material 2 and the main body portion 42, and gaps between the support concrete 3 and the main body portion 42 can be effectively filled. Therefore, the waterproof performance and durability of the support structure 1 can be further improved.

[0063] In some embodiments, in the upright portion placing step S40, the upright portion 4 is placed so that the second gap G2 is formed. Specifically, as shown in FIGS. 8 and 10, the upper end of the outdoor side surface 41a (43a) of the standing upper part 4 (additional part 43) is located at a lower position than the lower surface 2c of the exterior building material 2, and the standing upper part 4 (additional part 43) is placed so as to include a surface 41f (43f) extending inward from the upper end of the outdoor side surface 41a (43a). That is, the standing upper part 4 (additional part 43) is placed such that the surface 41f (43f) of the standing upper part 4 (additional part 43) faces the lower surface 2c of the exterior building material 2 and is located at a lower position than the lower surface 2c of the exterior building material 2. Therefore, a second gap G2 is formed between the lower surface 2c of the exterior building material 2 and the surface 41f (43f) of the standing upper part 4 (additional part 43). As shown in FIGS. 8 and 10, the second gap G2 opens outward between the standing upper part 4 (additional part 43) and the exterior building material 2. In addition, in order to form the second gap G2, for example, a spacer that does not adhere to the waterproof mortar may be installed in the first gap G1, and the spacer may be removed after the waterproof mortar hardens.

[0064] In the embodiment shown in FIGS. 8 and 10, the surface 41f (43f) of the standing upper part 4 (additional part 43) is oriented so as to incline downward as it faces the outdoor side. Therefore, since the second gap G2 opens wider outward, it becomes easier to arrange the waterproof seal 19 described later in the second gap G2. Also, the water that has entered the second gap G2 is easily discharged to the outside from the second gap G2.

[0065] After placing the standing upper part 4 (additional part 43) so that the second gap G2 is formed, a waterproof seal installation step S60 is performed. In the waterproof seal installation step S60, as shown in FIGS. 8 and 10, the waterproof seal 19 is arranged in the second gap G2. Specifically, the waterproof seal 19 is arranged such that the side surface 19a of the waterproof seal 19 is continuous with the outdoor side surface 41a (43a) of the standing upper part 4 (additional part 43). As described above, since the waterproof seal 19 is arranged in the second gap G2, it becomes difficult for water to enter the room from between the exterior building material 2 and the standing upper part 4 (main body part 42). Therefore, an exterior building material support structure 1 with improved waterproof performance can be provided.

[0066] In one embodiment, a paste-like sealing material may be filled in the second gap G2 and cured, and the sealing material may be disposed in the second gap G2 as a waterproof seal 19. By using the paste-like sealing material as the waterproof seal 19, cracks generated in the upright upper part 4 (additional part 43) due to the drying shrinkage of the waterproof mortar and the gap between the exterior building material 2 and the upright upper part 4 (main body part 42) can be effectively filled. Therefore, the waterproof property and durability of the support structure 1 can be further improved. In another embodiment, a solid sealing material processed into the shape of the second gap G2 may be embedded in the second gap G2 as a waterproof seal 19. By using the solid sealing material as the waterproof seal 19, the sealing material processed into the shape of the second gap G2 can be prepared in advance, so that the placement work of the waterproof seal 19 can be completed quickly.

[0067] In some embodiments, as shown in FIGS. 4 and 5, a waterproof seal material installation step S20 is performed before the upright upper part placing step S40. In the waterproof seal material installation step S20, as shown in FIGS. 6 and 7, the waterproof seal material 5 is installed along the first direction on the support concrete 3. After the waterproof seal material 5 is installed, the upright upper part 4 (main body part 42) is placed, so that the waterproof seal material 5 is embedded inside the upright upper part 4 (main body part 42). Therefore, it is difficult for water to penetrate indoors from between the support concrete 3 and the upright upper part 4 (main body part 42), and thus an exterior building material support structure 1 with improved waterproof property can be provided.

[0068] In one embodiment, the waterproof seal material 5 is installed such that the end portion of the waterproof seal material 5 in the first direction contacts the side surface 202 of the structure 200. By the waterproof seal material 5 contacting the side surface 202 of the structure 200, the space between the support concrete 3 and the upright upper part 4 can be waterproofed more effectively.

[0069] Also, in the waterproof sealant installation step S20, as shown in FIGS. 6 and 7, in the second direction which is a horizontal direction orthogonal to the first direction, the waterproof sealant 5 is installed within the range where the first gap G1 is formed. That is, on the upper surface 31 of the support concrete 3, the waterproof sealant 5 is installed between the second-direction position of the outdoor-side surface 2a of the exterior building material 2 and the second-direction position of the indoor-side surface 2b. In the embodiments shown in FIGS. 6 and 7, the waterproof sealant 5 is installed on the outdoor side of the support members 7 (7A, 7B) in the second direction. When the operator constructs the support structure 1 from the outdoor side of the building, the installation work of the waterproof sealant 5 can be easily performed. Also, the waterproof sealant 5 can prevent water that has entered from the outdoor side from reaching the support members 7 (7A, 7B). In other embodiments, the waterproof sealant 5 may be installed on the indoor side of the support members 7 (7A, 7B) in the second direction.

[0070] In the embodiments shown in FIGS. 4 and 5, the waterproof sealant installation step S20 is performed after the support member fixing step S10 and before the exterior building material attachment step S30. By installing the waterproof sealant 5 before attaching the exterior building material 2 to the support members 7 (7A, 7B), sufficient space required for the installation work of the waterproof sealant 5 can be secured, so that the waterproof sealant 5 can be easily installed. In other embodiments, the waterproof sealant installation step S20 may be performed before the support member fixing step S10, or the waterproof sealant installation step S20 may be performed after the exterior building material attachment step S30.

[0071] Note that in some embodiments, after applying a paste-like sealant on the upper surface 31 of the support concrete 3 and curing it, the sealant may be installed as the waterproof sealant 5. Thus, the waterproof sealant 5 can be easily installed. In other embodiments, the waterproof sealing material 5 may be installed by attaching a solid sealing material to the upper surface 31 of the support concrete 3 along the first direction. By using a solid sealing material, a sealing material processed into a desired shape can be prepared in advance as the waterproof sealing material 5.

[0072] In some embodiments, the waterproof sealing material 5 is installed so as to rise upward from the end 52 of the waterproof sealing material 5 in the first direction. Specifically, as shown in FIG. 2, after the waterproof sealing material 5 is installed along the first direction on the upper surface 31 of the support concrete 3 up to the side surface 202 of the structure 200, the waterproof sealing material 5 is installed on the side surface 202 up to the position of height h'. Alternatively, after the waterproof sealing material 5 is installed on the side surface 202 of the structure 200 from the position of height h' to the upper surface 31 of the support concrete 3, the waterproof sealing material 5 may be installed on the upper surface 31 along the first direction. As described above, since the waterproof sealing material 5 (the second part 53) is installed on the side surface 202 of the structure 200 up to the position of height h', even if water accumulates outside the building 9, the intrusion of water from the outside to the inside can be prevented.

[0073] The height h' rising from the end 52 of the waterproof sealing material 5 preferably satisfies the condition of 0.25 ≦ h' / H ≦ 1, where H is the distance between the upper surface 31 of the support concrete 3 and the lower surface 2c of the exterior building material 2. By the height h' satisfying the above conditions, even if water accumulates outside the building 9, the intrusion of water from the outside to the inside can be more reliably prevented.

[0074] When the paste-like sealing material is cured to form the waterproof sealing material 5, the sealing material can be continuously applied to the upper surface 31 of the support concrete 3 and the side surface 202 of the structure 200. Also, when a solid sealing material is used as the waterproof sealing material 5, one sealing material can be continuously attached to the upper surface 31 of the support concrete 3 and the side surface 202 of the structure 200.

[0075] In some embodiments, after the upright upper part placing step S40, a first waterproof film attaching step S70 is performed. In the first waterproof film attaching step S70, as shown in FIGS. 8 and 10, the first waterproof film 10 is attached to the outdoor side surface 41a (43a) of the upright upper part 4 (additional part 43). Thus, it becomes difficult for water to enter the room from between the support concrete 3 and the upright upper part 4 (additional part 43), so that the exterior building material support structure 1 with improved waterproof performance can be provided. In the embodiment illustrated in FIGS. 8 and 10, the upper end of the first waterproof film 10 is attached at the height position of the lower surface 2c of the exterior building material 2.

[0076] In other embodiments, the first waterproof film 10 may be attached to the outdoor side surface 41a (43a) of the upright upper part 4 (additional part 43) and the outdoor side surface 2a of the exterior building material 2. The upper end of the first waterproof film 10 is attached at a position higher than the height position of the lower surface 2c of the exterior building material 2. Thus, it becomes difficult for water to enter the room from between the exterior building material 2 and the upright upper part 4 (additional part 43).

[0077] In the embodiment shown in FIGS. 8 and 10, after the waterproof seal installation step S60, the first waterproof film attaching step S70 is performed. In this case, the first waterproof film 10 is attached to the outdoor side surface 41a (43a) of the upright upper part 4 (additional part 43) and the side surface 19a of the waterproof seal 19.

[0078] Also, in the first waterproof film attaching step S70, as shown in FIGS. 8 and 10, in addition to the outdoor side surface 41a (43a) of the upright upper part 4 (additional part 43), the first waterproof film 10 may be attached to the upper surface 31 of the support concrete 3. Since the first waterproof film 10 includes the first horizontal attachment part 11, it becomes more difficult for water to enter the room from between the support concrete 3 and the upright upper part 4 (additional part 43). In the embodiment shown in FIG. 8, the first waterproof film 10 is directly attached to the upper surface 31 of the support concrete 3.

[0079] In the embodiment shown in FIG. 10, the first waterproof film 10 is attached to the upper surface 31 of the support concrete 3 via the second horizontal attachment portion 21 of the second waterproof film 20. Therefore, it is difficult for water to penetrate between the additional portion 43 and the second horizontal attachment portion 21. Further, since the second horizontal attachment portion 21 is covered by the first horizontal attachment portion 11, deterioration of the second waterproof film 20 due to exposure to sunlight or rainfall can be suppressed. Therefore, the waterproof performance and durability of the exterior building material support structure 1 can be further improved.

[0080] In one embodiment, a sheet-like material may be attached to the outdoor side surface 41a as the first waterproof film 10. By using the sheet-like material as the first waterproof film 10, the first waterproof film 10 processed into a desired shape can be prepared in advance, so that the attachment work of the first waterproof film 10 can be completed promptly. In another embodiment, a film formed by solidifying a liquid waterproof agent on the outdoor side surface 41a may be used as the first waterproof film 10. By solidifying the liquid waterproof agent to form the first waterproof film 10, cracks generated in the upright portion 4, gaps between the exterior building material 2 and the upright portion 4 (additional portion 43), and gaps between the support concrete 3 and the upright portion 4 (additional portion 43) can be effectively filled. Therefore, the waterproof performance and durability of the support structure 1 can be further improved.

[0081] Note that the embodiments shown in FIGS. 1 to 10 are merely examples of the present disclosure. From the viewpoint of value engineering (VE), it is preferable that the configuration of the support structure 1 be as simple as possible within the range in which the required waterproof performance of the support structure 1 can be exhibited. For example, the first waterproof film 10 and the second waterproof film 20 are not essential components of the exterior building material support structure 1, and these components may be omitted as appropriate.

Explanation of Reference Numerals

[0082] 1: Support structure (exterior building material support structure) 2: Exterior building material 3: Support concrete 4: Upright portion 5: Waterproof sealing material 7: Support member 9: Building 10: First waterproof film 19: Waterproof seal 20: Second waterproof film 31: Upper surface 41a: Outer side surface 41b: Inner side surface 42: Main body part 43: Additional part 51: First part 52: End part 53: Second part 200: Structure 202: Side surface G1: First gap G2: Second gap

Claims

1. A construction method for an exterior building material support structure that supports an exterior building material that separates the interior and exterior of a building, comprising: A support member for supporting the exterior building material is fixed to the supporting concrete so that at least a portion of the supporting member extends upward from the supporting concrete; an exterior building material mounting step of mounting the exterior building material to the support member; A rising portion casting step of casting a rising portion formed of waterproof mortar into a first gap between the supporting concrete and the exterior building material; Equipped with When the direction in which the rising portion extends is a first direction, The waterproof sealant installation step further includes a waterproof sealant installation step of installing a waterproof sealant along the first direction on the supporting concrete prior to the rising portion casting step; The waterproof sealant is A first portion is installed between the supporting concrete and the rising portion and extends along the first direction; a second portion rising from an end of the first portion in the first direction and extending along a side surface of an adjacent structure; A method for constructing an exterior building material support structure, comprising:

2. In the rising portion casting step, the rising portion is cast so that a second gap opening toward the outside is formed between the rising portion and the exterior building material, The method further includes the step of disposing a waterproof seal in the second gap between the rising portion and the exterior building material. A method for constructing the exterior building material support structure according to claim 1.

3. The rising portion rises from the supporting concrete and has an exterior side surface oriented toward the exterior, A first waterproofing film attaching step is provided for attaching a first waterproofing film to the outdoor side surface. A method for constructing the exterior building material support structure according to claim 1 or 2.

4. A construction method for an exterior building material support structure that supports an exterior building material that separates the interior and exterior of a building, comprising: A support member for supporting the exterior building material is fixed to the supporting concrete so that at least a portion of the supporting member extends upward from the supporting concrete; an exterior building material mounting step of mounting the exterior building material to the support member; A rising portion casting step of casting a rising portion formed of waterproof mortar into a first gap between the supporting concrete and the exterior building material; Equipped with The rising part pouring step includes: A body part casting step of casting a body part that rises from the supporting concrete and has an indoor side surface oriented toward the interior of the building; An additional part casting step of casting an additional part having an outdoor side surface that rises from the supporting concrete and is oriented toward the outdoors; Including, Between the main body part casting step and the additional part casting step, The method further includes a second waterproofing membrane attachment step of attaching a second waterproofing membrane to the upper surface of the supporting concrete and the outdoor side surface of the main body. Method of construction of exterior building material support structure.

5. In the additional portion casting step, the additional portion is cast so that a second gap opening toward the outside is formed between the additional portion and the exterior building material, The method further includes the step of installing a waterproof seal in the second gap between the additional portion and the exterior building material. A method for constructing the exterior building material support structure according to claim 4.

6. The method further includes a first waterproofing film attachment step of attaching a first waterproofing film to the outdoor side surface of the additional portion. A method for constructing the exterior building material support structure according to claim 4.

7. When the direction in which the rising portion extends is a first direction, The method further includes a waterproof sealant installation step of installing a waterproof sealant along the first direction on the supporting concrete prior to the rising portion casting step. A method for constructing the exterior building material support structure according to any one of claims 4 to 6.

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