Construction methods for building materials, construction structures for building materials

Abstract

The present invention provides a construction method for building components that can reduce stress on building component 1 and thereby reduce damage. [Solution] This method involves pre-making screw holes 2 in a flat building component 1, driving screws 3 into the screw holes 2, and then installing the building component 1 to a base material 6. The diameter D3 of the body 30 of the screw 3 is smaller than the diameter D2 of the screw hole 2, and a gap 4 is provided between the outer surface 31 of the body 30 of the screw 3 and the inner surface 21 of the screw hole 2.

Description

Technical Field

[0001] The present invention relates to a construction method of building members and a construction structure of building members. More specifically, the present invention relates to a construction method of building members using building members and screws and a construction structure material of building members.

Background Art

[0002] Patent Document 1 describes a fluid device in which an opening to the outside of a fluid passage formed in the fluid device is closed by a closing plug. The closing plug is detachably screwed to the fluid passage and is hermetically held doubly with respect to the fluid passage by a first seal ring and a second seal ring. The first seal ring is made of nitrile rubber having a sealing property from an extremely low temperature state to a medium temperature state, and the second seal ring is made of fluororubber having a sealing property from a weakly low temperature state to a high temperature state.

[0003] Patent Document 1 describes an invention having two seal rings of nitrile rubber and fluororubber, and it is described that it is hermetically held doubly, and it is described that the purpose is to enhance the sealing effect by closely adhering them.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above structure, since the closing plug is in close contact with the fluid passage, there is a problem that the stress generated by expansion and contraction due to temperature change cannot be relieved.

[0006] This invention has been made in view of the above-mentioned reasons, and aims to provide a method for constructing building components and a construction structure for building components that can reduce damage to building components even when expansion and contraction occur due to temperature changes in the building components. [Means for solving the problem]

[0007] A method for constructing a building component according to one aspect of the present invention involves pre-making screw holes in a flat building component, driving screws into the screw holes, and then constructing the building component onto a base material. The diameter of the screw head is smaller than the diameter of the screw hole, and a gap is provided between the outer surface of the screw head and the inner surface of the screw hole.

[0008] A construction structure for a building member according to one aspect of the present invention comprises a screw hole formed in a flat building member and a screw driven into the screw hole and fixed to a base material. The diameter of the screw body is smaller than the diameter of the screw hole, and there is a gap between the outer surface of the screw body and the inner surface of the screw hole. [Effects of the Invention]

[0009] According to the present invention, the diameter of the screw shank is smaller than the diameter of the screw hole, and there is a gap between the outer surface of the screw shank and the inner surface of the screw hole. Therefore, even if the building material expands or contracts due to temperature changes, the inner surface of the screw hole is less likely to come into contact with the outer surface of the screw shank, which has the advantage of reducing stress on the building material and thus reducing damage. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a cross-sectional view showing a first embodiment of the construction structure for building components according to the present invention. [Figure 2] Figure 2 is a side view showing the screws used in the first embodiment described above. [Figure 3] Figure 3 is a front view showing the first embodiment described above. [Figure 4] Figure 4 is a cross-sectional view showing a second embodiment of the construction structure for building components according to the present invention. [Figure 5] Figure 5 is a side view showing the same screw. [Figure 6] Figure 6 is a front view showing a comparative example of the present invention. [Figure 7] Figure 7 is a cross-sectional view of the same. [Figure 8] Figure 8 is a cross-sectional view of the same. [Modes for carrying out the invention]

[0011] 1. Overview Figures 6, 7, and 8 show an example of the construction structure of building component 1. The construction structure of building component 1 is formed by arranging multiple building component 1 on the front side (outdoor side) of the base material 6. The base material 6 is a furring strip that extends in the vertical direction, and multiple base material 6 are connected in the vertical direction by attachments 62. Multiple base material 6 are also arranged in the left-right direction at predetermined intervals.

[0012] The building component 1 is, for example, a substantially flat exterior wall material, formed to extend in the left-right direction. Multiple building components 1 are arranged side by side in the vertical direction. The building components 1 are held in front of the base material 6 by fasteners 61 that secure their upper and lower ends.

[0013] As shown in Figure 7, the fastener 61 is provided on the front side of the base material 6. The fastener 61 comprises a fixing piece 613 fixed to the base material 6, a protruding piece 614 that protrudes forward from approximately the center of the fixing piece 613 in the vertical direction, an upper locking piece 611 that protrudes upward from the front end of the protruding piece 614, and a lower locking piece 612 that protrudes downward from the front end of the protruding piece 614.

[0014] The building member 1 has its upper solid portion 11 formed at the upper end thereof hooked (locked) to the upper fastener 61. At this time, the upper solid portion 11 is inserted and held between the lower locking piece 612 and the fixing piece 613 of the fastener 61. Also, the building member 1 has its lower solid portion 12 formed at the lower end thereof hooked to the lower fastener 61. At this time, the lower solid portion 12 is inserted and held between the upper locking piece 611 and the fixing piece 613 of the fastener 61.

[0015] When a plurality of building members 1 are constructed as described above, the building members 1 and the base material 6 expand and contract due to temperature changes caused by changes in air temperature or sunlight irradiation. However, since the linear expansion coefficients of the building members 1 and the base material 6 are different, a difference occurs in the amount of expansion and contraction. In particular, when the base material 6 is long in the vertical direction and made of metal, and the building member 1 is long in the horizontal direction and made of a ceramic siding material, a large difference occurs in the amount of expansion and contraction because the linear expansion coefficients of the building member 1 and the base material 6 are significantly different.

[0016] As shown in FIG. 8, when the base material 6 expands upward, the fastener 61 also moves upward accordingly, and further, due to the upward movement of the fastener 61, the building member 1 also moves upward. Therefore, a joint gap M1 having a dimension larger than a predetermined joint interval may occur between the adjacent building members 1 in the vertical direction.

[0017] However, since the fastener 61 is created in consideration of the expansion and contraction of the base material 6, even when the joint gap M1 occurs, the locking of the building member 1 by the upper locking piece 611 and the lower locking piece 612 does not come off and is held. And even when the base material 6 contracts from the extended state to the original state, the building member 1 moves downward due to its own weight, and the locking of the building member 1 by the upper locking piece 611 and the lower locking piece 612 is maintained.

[0018] When the building member 1 is constructed using the fastener 61 in this way, even when the base material 6 and the building member 1 expand and contract due to temperature changes, the holding of the building member 1 by the fastener 61 is not impaired, and there is almost no influence on the wind pressure resistance performance of the construction structure of the building member 1.

[0019] However, when part or all of the building member 1 is fixed to the base material 6 with screws 3 (direct fixing), stress is likely to occur in the part of the building member 1 fixed with the screws 3 due to the expansion and contraction of the base material 6. That is, when the base material 6 expands, the screw 3 moves accordingly. However, the part of the building member 1 where the screw 3 is driven does not expand as much as the base material 6. Therefore, due to the movement of the screw 3, the part of the building member 1 where the screw 3 is driven is pressed and stress occurs, and the building member 1 may be damaged.

[0020] Therefore, in the present embodiment, it has the following configuration. That is, the present embodiment is a method of providing screw holes 2 in a flat plate-shaped building member 1 in advance, driving screws 3 into the screw holes 2, and constructing the building member 1 on the base material 6. The diameter D3 of the body portion 30 of the screw 3 is smaller than the diameter D2 of the screw hole 2, and a gap 4 is provided between the outer peripheral surface 31 of the body portion 30 of the screw 3 and the inner peripheral surface 21 of the screw hole 2.

[0021] According to the present embodiment, since the diameter D3 of the body portion 30 of the screw 3 is smaller than the diameter D2 of the screw hole 2, and a gap 4 is provided between the outer peripheral surface 31 of the body portion 30 of the screw 3 and the inner peripheral surface 21 of the screw hole 2, even if the building member 1 expands and contracts due to temperature changes, it is difficult for the inner peripheral surface 21 of the screw hole 2 to contact the outer peripheral surface 31 of the body portion 30 of the screw 3, and the stress applied to the building member 1 can be reduced and damage can be reduced.

[0022] 2. Details Hereinafter, a construction method of a building member and a construction structure 100 of a building member according to an embodiment will be described with reference to FIGS. 1 to 5. Each figure is a schematic diagram, and the ratio of the size and thickness of each component in each figure does not necessarily reflect the actual dimensional ratio.

[0023] <00001​​​​(First Embodiment) Figure 1 shows a cross-sectional view of the construction structure 100 of the building component 1 according to this embodiment. This construction structure 100 is an exterior wall structure. Figure 3 shows a front view of the construction structure 100 of the building component 1 according to this embodiment. This construction structure 100 comprises the building component 1, a base material 6, and screws 3. Note that the construction structure 100 of this embodiment is not limited to an exterior wall structure, but may also be applied to an interior wall structure.

[0025] Figures 6, 7, and 8 show a construction structure in which the base material 6 is a vertical furring strip extending in the vertical direction and the building member 1 is a horizontal siding extending in the left-right direction. However, Figure 3 shows a construction structure 100 in which the base material 6 is a vertical furring strip extending in the vertical direction and the building member 1 is a vertical siding extending in the vertical direction. In other words, the construction structure 100 in Figure 3 uses the building member 1 and fasteners 61 shown in Figures 6, 7, and 8 so as to extend in the vertical direction.

[0026] In this embodiment, the building component 1 is an exterior wall material, but it is not limited to this. The building component 1 may also be an interior wall material. Furthermore, the building component 1 is not limited to wall materials, but may be any component used in a building, such as roofing material, flooring material, or fascia board. Therefore, the construction structure 100 of this embodiment is not limited to wall structures, but can also be applied to roof structures and floor structures.

[0027] The building component 1 is formed to extend in the vertical direction. Furthermore, the building component 1 is formed in a flat plate shape. Here, "flat plate shape" includes cases where the front surface (facing the outside) and the rear surface (facing the inside) are flat surfaces. Even if the front and rear surfaces have some irregularities, they are still included in the "flat plate shape" of this embodiment. In particular, the front surface of the building component 1 may have irregularities such as a pattern of raised and recessed areas, and this case is also included in the "flat plate shape." When viewed from the front (from the outside), the building component 1 can be formed as a vertically elongated rectangle.

[0028] Building component 1 is formed from ceramic siding material, which is a hardened product of cement-containing material, but is not limited to this. Building component 1 may be made of wood, metal, or plastic, for example.

[0029] In a front view, the right and left ends of the building component 1 are hooked (locked) onto the fasteners 61. The building component 1 has, for example, solid portions at its right and left ends, and is formed so that the fasteners 61 hook onto these solid portions. The building component 1, which is long in the left-right direction as shown in Figures 6-8, can be used in a state that is long in the vertical direction.

[0030] In this embodiment, multiple building members 1 are arranged side by side in the left-right direction. Adjacent building members 1 in the left-right direction are connected at their right and left ends. In Figure 3, the right ends of some of the building members 1 are fixed to the base material 6 with screws 3.

[0031] The base material 6 is a vertical furring strip extending in the vertical direction, and multiple base materials 6 are connected vertically by attachments 62. The multiple base materials 6 are also arranged horizontally at predetermined intervals.

[0032] The base material 6 is preferably made of aluminum. In this case, a lighter and easier-to-install base material 6 can be obtained compared to one made of iron or the like. However, it is also possible to use a base material 6 made of a material other than aluminum, and considering strength and other factors, it is preferable to use a metal other than aluminum. The base material 6 can have cross-sectional shapes such as C-shaped, H-shaped, and square-shaped.

[0033] The fastener 61 is used in a horizontal orientation as shown in Figure 6. Therefore, the fixing piece 613 of the fastener 61 is fixed to the base material 6, but the locking pieces that engage with the right and left ends of the building member 1 protrude to the right and left of the protruding piece 614.

[0034] Figure 1 shows the fixing position of the building component 1 by the screw 3 in this embodiment. The screw 3 is made of metal such as stainless steel, and for example, a screw for thin steel frames can be used. As shown in Figure 2, the screw 3 has a head 33, a body 30, a threaded portion 34, and a threaded tip 35.

[0035] The head portion 33 is formed in a flat plate shape (flat dish) and is approximately circular when viewed from the axial direction of the body portion 30. The diameter of the body portion 30 is larger than the diameters of the body portion 30, the threaded portion 34, and the threaded tip portion 35. The diameter of the head portion 33 is preferably about 12 mm in order to improve wind pressure resistance. The surface of the head portion 33 other than the part joined to the body portion 30 is formed as the head seating surface 32. The head seating surface 32 is made up of a flat surface.

[0036] The body portion 30 is joined at one end to the approximate center of one side of the head portion 33. The body portion 30 is formed in a roughly cylindrical shape. The outer circumferential surface (surface in the direction of the axis) 31 of the body portion 30 is formed as a flat curved surface.

[0037] The threaded portion 34 is formed to extend axially from the other end of the body portion 30 (the end opposite to the head portion 33). The threaded portion 34 is formed in a substantially cylindrical shape, and male threads are formed on its outer surface along its entire length.

[0038] The screw tip 35 is formed to protrude axially from the tip of the screw portion 34 (the end opposite to the body portion 30). The screw tip 35 has a drill-like shape and is formed in a shape that facilitates drilling. However, since a screw hole 2 is already formed in the building component 1, a reamer is not provided on the screw tip 35.

[0039] Figure 1 shows the construction structure 100 of the building component 1 using screws 3. The method for constructing the building component 1 in this manner is as follows.

[0040] First, screw holes 2 are formed in the building component 1. These screw holes 2 are formed in advance before the building component 1 is placed on the front side of the base material 6. The screw holes 2 are formed to penetrate the building component 1 in the thickness direction (front-to-back direction). The screw holes 2 are formed in a circular shape when viewed from the front. The diameter (diameter) D2 of the screw hole 2 is formed to be larger than the diameter D3 of the body 30 of the screw 3. Also, the diameter (diameter) D2 of the screw hole 2 is formed to be smaller than the diameter of the head 33 of the screw 3.

[0041] Next, the building component 1 is placed in front of the base material 6. At this time, the screw holes 2 are positioned in front of the base material 6. A spacer 8 is also provided between the building component 1 and the base material 6. The spacer 8 is provided so that there is no difference (a step in the front-to-back direction) between the part of the building component 1 that is held by the fastener 61. The spacer 8 can be made of wood, metal, or plastic.

[0042] Next, screw 3 is driven into screw hole 2 from the front. At this time, screw 3 is driven into approximately the center of screw hole 2 when viewed from the front. The head seating surface 32 of the head 33 of screw 3 is in contact with the opening edge 22 of screw hole 2. Furthermore, the entire body 30 of screw 3 is located in screw hole 2. The threaded portion 34 is screwed through the spacer 8 and the base material 6. The tip of the screw 35 is located behind the base material 6, having passed through it.

[0043] In this way, by driving multiple screws 3 along the longitudinal end of the building component 1 (the end that extends vertically, either the right end or the left end), the building component 1 can be attached by direct fastening with screws 3.

[0044] In this embodiment, since the diameter D3 of the body 30 of the screw 3 is smaller than the diameter D2 of the screw hole 2, a gap 4 is formed between the outer circumferential surface 31 of the body 30 of the screw 3 and the inner circumferential surface 21 of the screw hole 2. Furthermore, the building component 1 is fixed to the spacer 8 and the base material 6 by the head 33 pressing the building component 1 against the spacer 8 and the base material 6.

[0045] In this embodiment, the diameter D3 of the shank 30 of the screw 3 is smaller than the diameter D2 of the screw hole 2, and a gap 4 is provided between the outer surface 31 of the shank 30 of the screw 3 and the inner surface 21 of the screw hole 2. Therefore, even if the base material 6 and the building component 1 expand and contract in the vertical and horizontal directions due to temperature changes, the expansion and contraction can be absorbed by the gap 4. Consequently, the inner surface 21 of the screw hole 2 is less likely to come into contact with the outer surface 31 of the shank 30 of the screw 3, reducing the stress on the building component 1 from the screw 3 and thus reducing damage to the building component 1.

[0046] It is preferable that the difference between the diameter D2 of the screw hole 2 and the diameter D3 of the screw shank 30 be 0.1% or more of the length of the building component 1. This makes it less likely for the inner surface 21 of the screw hole 2 to come into contact with the outer surface 31 of the screw shank 30 even when the base material 6 of the building component 1 expands or contracts in the longitudinal direction (vertical direction) due to temperature changes, thereby further reducing damage to the building component 1. For example, if the longitudinal dimension (vertical direction) of the building component 1 is 3030 mm, it is preferable to set the difference between the diameter D2 of the screw hole 2 and the diameter D3 of the screw shank 30 to be 3.55 mm or more. For example, if the diameter D2 of the screw hole 2 is 5 mm, the diameter D3 of the screw shank 30 can be 9 mm, resulting in a difference of 4 mm between the diameter D2 of the screw hole 2 and the diameter D3 of the screw shank 30.

[0047] (Second Embodiment) The construction method and construction structure of the building component 1 according to this embodiment differ from the first embodiment in that the screw 3 is equipped with an elastic body 5 and a packing 7. Hereinafter, components similar to those in the first embodiment will be denoted by common reference numerals and their descriptions will be omitted as appropriate. The components described in the second embodiment can be applied in appropriate combination with the components described in the first embodiment.

[0048] As shown in Figure 5, in this embodiment, the screw 3 is equipped with an elastic body 5 and a packing 7. The material of the elastic body 5 is silicone resin or ethylene propylene rubber, and the elastic body 5 is formed to be elastically deformable. EPDM is preferred for the ethylene propylene rubber. The elastic body 5 is formed in a disc shape and has a diameter (outer diameter) slightly smaller than the diameter D2 of the screw hole 2. Therefore, the elastic body 5 can be inserted into the screw hole 2, and the outer surface of the elastic body 5 inserted into the screw hole 2 contacts the inner surface of the screw hole 2.

[0049] The elastic body 5 is attached to the shank 30 of the screw 3. The shank 30 penetrates approximately the center portion of the disc-shaped elastic body 5. Therefore, the distance from the shank 30 to the outer surface of the elastic body 5 is approximately constant in the direction of the shank 30's axis.

[0050] As shown in Figure 4, in the construction structure 100A of this embodiment, when a screw 3 is driven into the screw hole 2, the elastic body 5 makes it easier to position the body 30 so that it aligns with the axis (center in a front view) of the screw hole 2. As a result, the elastic body 5 acts as a positioning member when driving in the screw 3, making it easier to drive in the screw 3. In addition, since the elastic body 5 blocks communication in the screw hole 2, the elastic body 5 functions as a packing, which can suppress the intrusion of water from the screw hole 2.

[0051] The packing 7 is made of silicone resin or ethylene propylene rubber, similar to the elastic body 5, and is formed to be elastically deformable. The packing 7 is provided across the entire surface of the screw head seating surface 32. Therefore, when the screw 3 is driven into the screw hole 2, the packing 7 contacts the entire circumference of the opening edge 22 of the screw hole 2. The gap between the screw head seating surface 32 and the opening edge 22 of the screw hole 2 can be sealed by the packing 7, improving waterproofing.

[0052] (summary) As described above, the first embodiment is a method of installing a building member 1 to a base material 6 by pre-making screw holes 2 in a flat building member 1, driving screws 3 into the screw holes 2, and so on. The diameter D3 of the body 30 of the screw 3 is smaller than the diameter D2 of the screw hole 2, and a gap 4 is provided between the outer surface 31 of the body 30 of the screw 3 and the inner surface 21 of the screw hole 2.

[0053] In this embodiment, the diameter D3 of the shank 30 of the screw 3 is smaller than the diameter D2 of the screw hole 2, and a gap 4 is provided between the outer circumferential surface 31 of the shank 30 of the screw 3 and the inner circumferential surface 21 of the screw hole 2. Therefore, even if the building component 1 expands or contracts due to temperature changes, the inner circumferential surface 21 of the screw hole 2 is less likely to come into contact with the outer circumferential surface 31 of the shank 30 of the screw 3, thereby reducing the stress on the building component 1 and minimizing damage.

[0054] The second aspect is a method for installing the building component 1 according to the first aspect, wherein the difference between the diameter D2 of the screw hole 2 and the diameter D3 of the body 30 of the screw 3 is 0.1% or more of the length of the building component 1.

[0055] According to this embodiment, even if the building component 1 undergoes expansion or contraction due to temperature changes, the inner surface 21 of the screw hole 2 is less likely to come into contact with the outer surface 31 of the body 30 of the screw 3, thereby reducing the stress on the building component 1 and making it easier to reduce damage.

[0056] The third embodiment is a method for installing a building component 1 according to the first or second embodiment, wherein a disc-shaped elastic body 5 having a diameter smaller than the diameter D2 of the screw hole 2 is provided in the screw hole 2 together with the screw 3.

[0057] In this embodiment, the disc-shaped elastic body 5 functions as a packing, preventing water from entering through the screw hole 2. It also acts as a positioning member when driving in the screw 3, making it easier to drive in the screw 3.

[0058] The fourth aspect is a method for constructing the building component 1 according to the third aspect, wherein the material of the elastic body 5 is silicone resin or ethylene propylene rubber.

[0059] According to this embodiment, the elastic body 5 can easily deform in response to the expansion and contraction of the building component 1 due to temperature changes, and the waterproofing effect is less likely to be impaired.

[0060] The fifth aspect is a method for installing a building component 1 according to any one of the first to fourth aspects, wherein the base material 6 beyond which the screw 3 penetrates the screw hole 2 is made of aluminum.

[0061] According to this embodiment, even if the building component 1 and the base material 6 expand and contract due to temperature changes, the inner surface 21 of the screw hole 2 is less likely to come into contact with the outer surface 31 of the body 30 of the screw 3, thereby reducing the stress on the building component 1 and reducing damage.

[0062] The sixth aspect is a method for constructing a building component 1 according to any one of the first to fifth aspects, wherein the building component 1 is an exterior wall material.

[0063] According to this embodiment, even if the building component 1, which is an exterior wall material, expands and contracts due to changes in outside temperature, the inner surface 21 of the screw hole 2 is less likely to come into contact with the outer surface 31 of the shank 30 of the screw 3, thereby reducing the stress on the building component 1 and minimizing damage.

[0064] The seventh embodiment is a method for installing a building component 1 according to any one of the first to sixth embodiments, wherein a packing 7 is installed on the head seating surface 32 of a screw 3.

[0065] According to this embodiment, the gap between the head seating surface 32 of the screw 3 and the opening edge 22 of the screw hole 2 can be sealed with the packing 7, thereby improving waterproofing.

[0066] The eighth aspect is a construction structure 100, 100A for a building member 1, comprising a screw hole 2 formed in a flat building member 1, and a screw 3 driven into the screw hole 2 and fixed to a base material 6. The diameter D3 of the body 30 of the screw 3 is smaller than the diameter D2 of the screw hole 2, and there is a gap 4 between the outer circumferential surface 31 of the body 30 of the screw 3 and the inner circumferential surface 21 of the screw hole 2.

[0067] According to this embodiment, the diameter D3 of the shank 30 of the screw 3 is smaller than the diameter D2 of the screw hole 2, and there is a gap 4 between the outer surface 31 of the shank 30 of the screw 3 and the inner surface 21 of the screw hole 2. Therefore, even if the building material 1 expands or contracts due to temperature changes, the inner surface 21 of the screw hole 2 is less likely to come into contact with the outer surface 31 of the shank 30 of the screw 3, thereby reducing the stress on the building material 1 and minimizing damage. [Explanation of Symbols]

[0068] 1. Building materials 2 screw holes 3 screws 4 gaps 5 Elastic body 6. Substrate 7. Packing 21 Inner surface 30 Torso 31 Outer surface 32 Headrest 100 Construction structure D2 Screw hole diameter D3 screw diameter

Claims

1. A construction method comprising pre-making screw holes in a flat building component, driving screws into the screw holes, and then installing the building component to a base material, The diameter of the screw body is smaller than the diameter of the screw hole, and a gap is provided between the outer surface of the screw body and the inner surface of the screw hole. Installation methods for building materials.

2. The difference between the diameter of the screw hole and the diameter of the screw head is 0.1% or more of the length of the building component. A method for constructing building components according to claim 1.

3. A disc-shaped elastic body having a diameter smaller than the diameter of the screw hole is provided in the screw hole together with the screw. A method for constructing building components according to claim 1 or 2.

4. The material of the elastic body is silicone resin or ethylene propylene rubber. A method for constructing building components according to claim 3.

5. The base material beyond which the screw penetrates the screw hole is made of aluminum. A method for constructing building components according to claim 1 or 2.

6. The aforementioned building component is an exterior wall material. A method for constructing building components according to claim 1 or 2.

7. A packing is installed on the head seating surface of the screw. A method for constructing building components according to claim 1 or 2.

8. It comprises a screw hole formed in a flat building component, and a screw driven into the screw hole and fixed to the base material, The diameter of the screw body is smaller than the diameter of the screw hole, and there is a gap between the outer surface of the screw body and the inner surface of the screw hole. Construction structure for building materials.

Images