Installation method and installation structure for rain protection sheets for welding.

Abstract

To enable welding for vertically connecting upper and lower steel pipe having joints even under rain.SOLUTION: This method for fitting a rain curing sheet S comprises: a step of sticking a first double-side tape 16 to the position of an upper steep pipe 1q; a step of sticking an elastic member 18 having an inner surface having a recessed part based on the welded thickness 1d of the steep pipe 1q and brought into contact with the first double-side tape and an outer surface having a smooth projected bent shape to the outside of the first double-side tape 16; and a step of fastening by a fastening belt from the outside of the rain curing sheet S so that the rain curing sheet S can extend over the entire periphery of the steep pipe 1q including the outer surface of the elastic member.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a method and a structure for mounting a rain curing sheet for welding. [Background Art]

[0002] In construction work for a building having steel columns such as a steel frame structure, when erecting columns, steel column members formed to appropriate lengths are stacked vertically from the foundation of the building, and joints of the respective members are welded at the construction site to erect the columns. Welding work for steel columns at construction sites is sometimes performed in an environment substantially the same as outdoor work that is affected by rain and the like.

[0003] Patent Document 1 discloses a temporary rain and wind protection device for steel column welding that enables welding work even in rainy weather or strong wind. In order to perform welding work on the joint of a steel column, frame support members are arranged in two upper and lower stages on the upper steel column appropriately spaced apart from the welding position (joint). At this time, when fixing the frame support frame of the upper frame support member around the steel column, the base end of the draining member is sandwiched between the column surface abutting portion of the frame support frame and the column surface, so that the base end of the draining member is brought into close contact with the column surface. After the frame support members are provided on the steel column, the base ends of pipe arms are respectively connected to the support plates provided at four corners of the upper frame support member and the support plates provided between the corners. Then, a pipe cheek support is provided between the intermediate connecting plate of each pipe arm and the corresponding support plate of the lower frame support member, a tie rod is provided between the locking protrusions of the pipe arms, and a frame is provided around the steel column. After the frame is assembled, a rainproof sheet is placed over the upper surface of the frame, and a windproof sheet is suspended from each tie rod at the tip of the frame to complete the rain and wind protection device. Patent Document 1 describes that this rain and wind protection device allows welding work to be performed without being affected by rain or wind by performing welding work in a space partitioned by the sheet, and enables work to be performed according to the schedule regardless of the weather. [Prior Art Document] [Patent Document]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-109176 [Overview of the project] [Problems that the invention aims to solve]

[0005] Now, steel pipes with longitudinally extending welded joints, such as press-formed square steel pipes (BCP) for building structures, are actually used. These press-formed square steel pipes are made by press-forming the corners of the steel pipe, placing two press-formed bodies opposite each other, and welding the joints. When such steel pipes are used as steel columns, the weld buildup is exposed on the outer surface, and this weld buildup extends continuously in the longitudinal direction of the steel column. In order to connect such seamed square column steel pipes longitudinally, that is, vertically, at the construction site, it is desirable to be able to perform the welding work at the joints even in rainy weather. However, the device described in Patent Document 1 is not intended for such weld buildup locations in seamed square column steel pipes, that is, steel pipes with longitudinally extending weld buildup.

[0006] The purpose of this disclosure is to provide a configuration that enables welding to connect a steel pipe with joints to its upper and lower sections, even in rainy weather. [Means for solving the problem]

[0007] The first aspect of this disclosure is, A method for attaching a welding rain protection sheet to the upper side of a joint when a second steel pipe having a longitudinally extending weld buildup is stacked on top of a first steel pipe having a longitudinally extending weld buildup, and the joint between the first and second steel pipes is welded, The process involves applying the first double-sided tape to the second steel pipe at a position above the joint such that the inner adhesive surface of the first double-sided tape adheres to the area of ​​the second steel pipe including the weld buildup, The process involves attaching an elastic member to the outer adhesive surface of the first double-sided tape, the elastic member having a concave shape corresponding to the weld buildup of the second steel pipe on its inner surface that contacts the first double-sided tape, and an outer surface extending to the back side of the inner surface, wherein the outer surface has a smoother convex shape than the convex shape of the weld buildup of the second steel pipe, A step of tightening the rain protection sheet with a tightening belt member from the outside of the rain protection sheet so that the rain protection sheet extends around the entire circumference of the second steel pipe, including the outer surface of the elastic member. Installation method To provide.

[0008] According to the configuration of the first embodiment, it is possible to effectively prevent a gap from forming between the rain protection sheet and the second steel pipe above the joint between the first steel pipe and the second steel pipe. Therefore, it becomes possible to perform welding work at the joint between the first steel pipe and the second steel pipe even in rainy weather.

[0009] Preferably, the mounting method further includes the steps of: attaching the second double-sided tape to the outer surface of the elastic member such that the inner adhesive surface of the second double-sided tape adheres to the outer adhesive surface of the second double-sided tape such that the rain protection sheet extends around the entire circumference of the second steel pipe. This makes it possible to more effectively prevent gaps from forming between the rain protection sheet and the second steel pipe.

[0010] Preferably, the first double-sided tape has a thickness of 1 mm to 3 mm. With this configuration, the first double-sided tape can undergo elastic deformation in the thickness direction according to the material of the first double-sided tape, and the first double-sided tape can stretch and adhere to the surface of the second steel pipe more flexibly. Similarly, the second double-sided tape may also have a thickness of 1 mm to 3 mm. By having the same configuration for the second double-sided tape, elastic deformation in the thickness direction according to the material of the second double-sided tape can be achieved, and the second double-sided tape can stretch and adhere to the surface of the elastic member more flexibly. The first and second double-sided tapes may each have a certain degree of elasticity in the thickness direction, and may be made of synthetic rubber or natural rubber, for example, or acrylic rubber. This allows the first and second double-sided tapes to undergo elastic deformation more reliably in the thickness direction. However, both the first and second double-sided tapes may be repeatedly attached and detached a certain number of times or more.

[0011] Preferably, a support member for the rain protection sheet is positioned below the first double-sided tape on the second steel pipe. This makes it possible to spread and position the rain protection sheet more favorably above the joint between the first and second steel pipes.

[0012] A second aspect of this disclosure is: A mounting structure for a welding rain protection sheet provided above a joint when a second steel pipe having a longitudinally extending weld buildup is stacked on top of a first steel pipe having a longitudinally extending weld buildup, and the joint between the first and second steel pipes is welded, A first double-sided tape is attached to the second steel pipe at a position above the aforementioned joint, such that its inner adhesive surface adheres to the area of ​​the second steel pipe including the welded build-up portion. An elastic member having a concave portion corresponding to the weld buildup of the second steel pipe on its inner surface in contact with the first double-sided tape, and an outer surface extending to the back side of the inner surface, wherein the outer surface has a smoother convex shape than the convex shape of the weld buildup of the second steel pipe, A tightening belt member is provided on the outside of the rain protection sheet so that the rain protection sheet extends around the entire circumference of the second steel pipe, including the outer surface of the elastic member, and the rain protection sheet extends around the entire circumference of the second steel pipe. Mounting structure To provide.

[0013] According to the configuration of the second embodiment, it is possible to effectively prevent a gap from forming between the rain protection sheet and the second steel pipe above the joint between the first steel pipe and the second steel pipe. Therefore, welding work at the joint between the first steel pipe and the second steel pipe can be performed even in rainy weather.

[0014] Preferably, the mounting structure further comprises a second double-sided tape, the inner adhesive surface of which adheres to the outer surface of the elastic member and the rain protection sheet adheres to the outer adhesive surface of which. This configuration makes it possible to more effectively prevent gaps from forming between the rain protection sheet and the second steel pipe.

[0015] Preferably, in the mounting structure of the second embodiment described above, the first double-sided tape has a thickness of 1 mm to 3 mm. With this configuration, the first double-sided tape can undergo elastic deformation in the thickness direction according to the material of the first double-sided tape, and the first double-sided tape can stretch and adhere to the surface of the second steel pipe more flexibly. Similarly, the second double-sided tape may also have a thickness of 1 mm to 3 mm. By having the second double-sided tape also have this configuration, the second double-sided tape can undergo elastic deformation in the thickness direction according to the material of the second double-sided tape, and the second double-sided tape can stretch and adhere to the surface of the elastic member more flexibly. The first double-sided tape and the second double-sided tape may each have a certain degree of elasticity in the thickness direction, and may be made of synthetic rubber or natural rubber, for example, acrylic rubber may be used. This makes it possible for the first double-sided tape and the second double-sided tape to undergo elastic deformation more reliably in the thickness direction. However, both the first and second double-sided tapes should be able to be repeatedly attached and removed a certain number of times.

[0016] Preferably, the mounting structure of the second embodiment described above further comprises a support member for supporting the rain protection sheet, which is provided at the position of the second steel pipe below the first double-sided tape. This makes it possible to spread out and position the rain protection sheet more favorably above the joint between the first steel pipe and the second steel pipe. [Effects of the Invention]

[0017] According to the above-described embodiment of this disclosure, the above configuration makes it possible to perform welding to connect a steel pipe with joints in its longitudinal direction, even in rainy weather. [Brief explanation of the drawing]

[0018] [Figure 1] This diagram shows a steel pipe with joints; (a) is its plan view, and (b) is its front view. [Figure 2]It is a front view showing the initial stage of attaching a rain curing sheet before stacking another steel pipe on a steel pipe and welding the joint therebetween. [Figure 3] It is a schematic cross-sectional view showing an example of a gap formed around a weld overlay of a steel pipe. [Figure 4] (a) is a cross-sectional view showing a weld overlay portion of a steel pipe, (b) is a view showing an attachment shape of a first double-sided adhesive tape attached to the steel pipe of (a), (c) is a view showing an elastic member attached to the first double-sided adhesive tape of (b), and (d) is a view showing an attachment shape of a second double-sided adhesive tape attached to the elastic member. [Figure 5] It is a perspective view of an elastic member. [Figure 6] It is a top view showing an attached state of a rain curing sheet around a weld overlay of a steel pipe. [Figure 7] It is a schematic view showing a state where the rain curing sheet shown in Fig. 6 is tightened from the outside with a tightening belt member. [Figure 8] It is an explanatory view for explaining attachment of the rain curing sheet to the second double-sided adhesive tape, a support member and the like. [Figure 9] It is a front view showing a state where a rain curing sheet is attached to a steel pipe. [Figure 10] It is a flowchart as an example showing a flow of attaching a rain curing sheet. MODE FOR CARRYING OUT THE INVENTION

[0019] Hereinafter, embodiments according to the present disclosure will be described with reference to the accompanying drawings. The same parts (or configurations) are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[0020] A method and structure for attaching a rain curing sheet for welding according to an embodiment of the present disclosure will be described with reference to the drawings.

[0021] Figure 1 shows a steel pipe with a joint 1, where (a) is a plan view and (b) is a front view. The steel pipe 1 is a press-formed rectangular steel pipe, made by press-forming the corner portion of the steel pipe, arranging two press-formed bodies 1a and 1b opposite each other, and welding the butt joint. It forms all or part of a steel column, i.e., a column member. In this steel pipe 1, the butt joint surface of the press-formed bodies 1a and 1b extends in the longitudinal direction 1c, and a weld buildup 1d extends along it.

[0022] Here, steel pipe 1 serves as a column member and is installed so that its longitudinal direction extends vertically. Then, as shown in Figure 2, another steel pipe 1 is placed on top of it. In Figure 2, the lower steel pipe 1 corresponds to the first steel pipe and is denoted by reference numeral 1p, and the upper steel pipe 1 corresponds to the second steel pipe and is denoted by reference numeral 1q.

[0023] The joint 2 between steel pipe 1p and steel pipe 1q is generally welded, but welding cannot be performed in rainy weather. Therefore, in order to improve the efficiency of welding by performing welding even in rainy weather, a rain protection sheet S (see Figure 9) is attached above the joint 2, preferably at a predetermined distance above the joint 2. Since the rain protection sheet S is placed on the steel pipe 1q above the joint 2 during welding of the joint 2, it is desirable that it has a certain degree of heat resistance while also being waterproof.

[0024] In Figure 2, the water intrusion prevention structure 10, the first frame base 12, and the second frame base 14, which are mounting structures described below, are shown from top to bottom on the steel pipe 1q on the steel pipe 1p. Note that the first frame base 12 and the second frame base 14 may be constructed as a single frame base, or they may be further divided.

[0025] The water intrusion prevention structure 10 is configured to prevent water from running down the surface of the steel pipe 1q and dripping onto the inside of the rain protection sheet S. Generally, when a rain protection sheet S is simply attached to a steel pipe 1q with a weld buildup 1d using a string or other material, a gap G is formed on the inside of the rain protection sheet S around the weld buildup 1d, as schematically shown in Figure 3. This is because there is variation in the surface shape of the weld buildup 1d, and for example, it has a convex curved outer surface as shown in Figure 3. Therefore, in order to prevent the formation of this gap G, the water intrusion prevention structure 10, which will be described below, is provided on the outer surface of the steel pipe 1q around its entire circumference when attaching the rain protection sheet S.

[0026] As shown in Figure 4, the water intrusion prevention structure 10 comprises a double-sided tape (hereinafter referred to as the first double-sided tape) 16, an elastic member 18, and a double-sided tape (hereinafter referred to as the second double-sided tape) 20. A rain protection sheet S is attached to the outside of the second double-sided tape 20, and a tightening belt member 22 is placed on top of it. In the drawing, the first double-sided tape 16 and the second double-sided tape 20 are shown with dashed lines to make the arrangement relationship with adjacent members 18, S, etc. easier to see.

[0027] The first double-sided tape 16 is directly attached to the steel pipe 1q such that its inner adhesive surface 16a adheres to the area of ​​the steel pipe 1q including the weld buildup 1d, at a position on the steel pipe 1q above the joint 2. In this embodiment, the first double-sided tape 16 is directly attached to the steel pipe 1q such that its inner adhesive surface 16a adheres to the entire circumference of the steel pipe 1q including the weld buildup 1d, at a position on the steel pipe 1q above the joint 2. Here, the first double-sided tape 16 has a thickness of 1 mm to 3 mm, but is not limited to this thickness. For example, the first double-sided tape 16 may have a thickness of 2 mm. The first double-sided tape 16 may be elastically deformable in the thickness direction, that is, it may have a certain degree of elasticity in the thickness direction, and may be made of synthetic rubber or natural rubber, for example, it may be made using acrylic rubber. Furthermore, the first double-sided tape 16 may be repeatedly attached and detached a certain number of times or more. The width of the first double-sided tape 16 is preferably 1 cm or more, and more preferably 2 cm to 10 cm, but is not limited to this width.

[0028] The elastic member 18 is provided on the outside of the first double-sided tape 16, that is, radially outward from the axis of the steel pipe 1q. The elastic member 18 is configured to have the function of converting the convex shape of the weld buildup 1d of the steel pipe 1q into a smoother convex shape. In this embodiment, a second double-sided tape 20 is used, so the elastic member 18 is provided between the first double-sided tape 16 and the second double-sided tape 20. Figure 5 shows a perspective view of the elastic member 18. The elastic member 18 is provided in locations other than the corners of the steel pipe 1q and is configured to be positioned on the side surface of the steel pipe 1q having the weld buildup 1d. In this case, the elastic member 18 is a member having a roughly triangular prism shape. Therefore, when the elastic member 18 is positioned relative to the steel pipe 1q, it has an upper surface 18d located above it, a lower surface 18e located below it, and a circumferential surface 18f extending between them and positioned to extend in the circumferential direction of the steel pipe 1q, the circumferential surface 18f being composed of an inner surface 18a and an outer surface 18b. In particular, the circumferential surface 18f is substantially composed only of an inner surface 18a and an outer surface 18b. The width of the elastic member 18 corresponding to the vertical direction, i.e., the width direction W, may be a width corresponding to the width of the first double-sided tape 16. Here, the upper surface 18d and the lower surface 18e are substantially parallel, and the width of the elastic member 18, i.e., the length between the upper surface 18d and the lower surface 18e, is approximately the same as the width of the first double-sided tape 16, but may be longer or shorter than the width of the first double-sided tape 16. The inner surface 18a of the elastic member 18 is in contact with the first double-sided tape 16 and adheres to the outer adhesive surface 16b of the first double-sided tape 16. The outer surface 18b adheres to the inner adhesive surface 20a of the second double-sided tape 20. The inner surface 18a is flat, but has a concave portion 18c approximately in the center of its longitudinal direction L corresponding to the weld buildup 1d of the steel pipe 1q. The concave portion 18c extends in the width direction W and extends from the upper surface 18a to the lower surface 18e. The shape of this concave portion 18c should be designed to match the shape of the weld buildup 1d of the steel pipe 1q as much as possible. The elastic member 18 can be attached to the outside of the first double-sided tape 16 such that the weld buildup 1d fits into this concave portion 18c. The outer surface 18b of the elastic member 18 extends to the back side of the inner surface 18a in the thickness direction T, that is, in the radial direction of the axis of the steel pipe 1q.The outer surface 18b is directly connected to the inner surface 18a at both ends in the longitudinal direction L of the elastic member 18, and has a mountain-like shape that is thinnest at the ends where it connects to the inner surface 18a and protrudes most from the inner surface 18a approximately in the center away from those ends. Therefore, the outer surface 18b is configured as a surface that is smoother than the concave portion 18c, that is, a surface with a convex curved shape that is smoother than the convex shape of the weld buildup 1d. As is clear from Figures 4(a) to (c), the convex curved shape of the outer surface 18b is smoother than the convex curved shape of the corresponding weld buildup 1d for the concave portion 18c.

[0029] In this case, the elastic member 18 is made of expanded polystyrene. Therefore, it has a certain degree of elasticity and can be compressed and elastically deformed by an external force. Note that the elastic member 18 is not limited to being made of expanded polystyrene, but may be made of other foamed materials, synthetic rubber, natural rubber, or other elastic materials.

[0030] The second double-sided tape 20 is attached to the outer surface 18b of the elastic member 18 such that its inner adhesive surface 20a adheres to it. In this embodiment, the second double-sided tape 20 is attached so that its inner adhesive surface 20a adheres to the entire circumference of the steel pipe 1q, including the outer surface 18b of the elastic member 18. Therefore, the inner adhesive surface 20a of the second double-sided tape 20 adheres to the outer surface 18b of the elastic member 18 and to the outer adhesive surface 16b of the first double-sided tape 16, but a thin sheet material such as paper may be placed between it and the first double-sided tape 16 to keep it away from the first double-sided tape 16. Here, the second double-sided tape 20 has a thickness of 1 mm to 3 mm, but is not limited to this thickness. For example, the second double-sided tape 20 may have a thickness of 2 mm. The second double-sided tape 20 is preferably elastically deformable in the thickness direction, that is, it is preferably elastic to a certain extent in the thickness direction, and is preferably made of synthetic rubber or natural rubber, for example, it is preferably made using acrylic rubber. Furthermore, the second double-sided tape 20 is preferably able to be repeatedly attached and detached a certain number of times or more. The width of the second double-sided tape 20 is preferably 1 cm or more, preferably 2 cm to 10 cm, but is not limited to this width. Here, the second double-sided tape 20 is the same as the first double-sided tape 16, and has the same width and thickness, but it may have a different width and thickness from the first double-sided tape 16. Also, the second double-sided tape 20 may be made from a different material than the first double-sided tape 16.

[0031] Then, as shown in Figure 6, the rain protection sheet S is attached to the outer adhesive surface 20b of the second double-sided tape 20. When shown in Figure 2 or Figure 7, the rain protection sheet S is attached to the second double-sided tape 20 so that a small amount of the sheet fabric is left above the second double-sided tape 20, and most of it hangs down from the second double-sided tape 20, i.e., the water intrusion prevention structure 10. Here, the rain protection sheet S is a single sheet and is attached to the second double-sided tape 20 so as to wrap around the steel pipe 1q.

[0032] The tightening belt member 22 is a member used to tighten the first double-sided tape 16, the elastic member 18, the second double-sided tape 20, and the rain protection sheet S, which are arranged around the steel pipe 1q, from the outside. The tightening belt member 22 may be a single belt member or may be configured as an annular member from the beginning. A so-called cargo securing belt is preferably used as the tightening belt member 22.

[0033] As shown in Figure 7, when the tightening belt member 22 is tightened from the outside of the rain protection sheet S, forces F1 and F2 are generated along the tightening belt member 22, and as a result, forces F3 and F4 act on the rain protection sheet S, the second double-sided tape 20, the elastic member 18 and the first double-sided tape 16, pressing them from the outside to the inside against the steel pipe 1q. As a result, forces F3 and F4 act on the elastic member 18 in a direction that crushes the concave portion 18c, attempting to eliminate the gap G around the weld buildup 1d. It should be understood that, as described above, an elastic member 18 is provided for each weld buildup 1d of the steel pipe 1q, for example, using the first double-sided tape 16.

[0034] Furthermore, the outer surface of the steel pipe 1q other than the weld buildup 1d is generally smooth. Therefore, by attaching the rain protection sheet S using the first double-sided tape 16, the elastic member 18, and the second double-sided tape 20, and then tightening it with the tightening belt member 22, it is virtually impossible for a gap G to form on the outside of the steel pipe 1q.

[0035] Furthermore, the first frame base 12 and the second frame base 14, which are installed below the water intrusion prevention structure 10, are equipped with magnets and attached to the outer surface of the steel pipe 1q. Therefore, the installation of the first frame base 12 and the second frame base 14 is easy. Multiple support members 30 are attached to the first frame base 12 so as to extend radially from the axis of the steel pipe 1q, and further, a brace member 32 corresponding to each support member 30 is attached to the second frame base 14 so as to support the support members 30. The installation of these support members 30 and brace members 32 may be performed immediately before or immediately after the installation of the rain protection sheet S. Figure 8 shows that the support members 30 and brace members 32 have been installed immediately before the installation of the rain protection sheet S, but the support members 30 and brace members 32 may also be installed after the installation of the rain protection sheet S. It is easier to attach the tightening belt member 22 when attaching the support member 30 and the brace member 32 after attaching the rain protection sheet S. The arrow in Figure 8 schematically shows how to attach the rain protection sheet S by placing it on top of the support member 30 and the brace member 32. The support member 30 and the brace member 32 should be easily attached and detachable using a mechanical or magnetic method.

[0036] Figure 9 shows the rain protection sheet S installed as described above. The mounting structure AS of the rain protection sheet S shown in Figure 9 has the above configuration including the water intrusion prevention structure 10. Furthermore, the upper end Sa of the rain protection sheet S is fixed to the outer surface of the steel pipe 1q with a tape member 40. Therefore, it is possible to further prevent rainwater from flowing inside the rain protection sheet S.

[0037] Here, an example of the process for attaching the rain protection sheet S to the steel pipe 1q above joint 2 will be explained based on the flowchart in Figure 10. However, from the above explanation, it should be understood that various order of steps other than those shown in Figure 10 are possible.

[0038] First, the first frame base 12 and the second frame base 14 are attached (step S1001). Then, the first double-sided tape 16 is attached (step S1003). Next, the elastic member 18 is attached (step S1005), the second double-sided tape 20 is attached (step S1007), and the rain protection sheet S is attached (step S1009). After that, the tightening belt member 22 is attached (step S1011), the tape member 40 is attached to fix the upper end Sa of the rain protection sheet S (step S1013), and then the support member 30 and the brace member 32 are attached (step S1015). This allows the rain protection sheet S to be suitably attached to the steel pipe 1q, and welding of the joint 2 becomes possible even in rainy weather. The welding of the joint 2 may be done manually by a worker, but it is preferable to do it with an automatic welding machine.

[0039] The following describes some of the features and effects of the above-described method and structure AS for attaching a rain-resistant sheet for welding.

[0040] When a second steel pipe 1q, which has a weld buildup 1d extending in the longitudinal direction 1c, is stacked on top of a steel pipe 1p, which has a weld buildup 1d extending in the longitudinal direction 1c, and a joint 2 between the steel pipes 1p and 1q is welded, a welding rain protection sheet S is attached to the upper side of the joint 2. The attachment structure AS comprises a first double-sided tape 16, an elastic member 18, and a tightening belt member 22. First, the first double-sided tape 16 is attached to the steel pipe 1q above the joint 2 such that the inner adhesive surface 16a of the first double-sided tape 16 adheres to the area of ​​the steel pipe 1q including the weld buildup 1d (step S1003). Next, an elastic member 18 is attached to the outer adhesive surface 16b of the first double-sided tape 16, having a concave portion 18c on its inner surface 18a that contacts the first double-sided tape 16, corresponding to the weld buildup 1d of the steel pipe 1q (step S1005). The elastic member 18 has an outer surface 18b that extends to the back of the inner surface 18a. At this time, the elastic member 18 can be attached to the outside of the first double-sided tape 16 so that the weld buildup 1d fits into the concave portion 18c. This allows the elastic member 18 to function in such a way that it converts the convex shape of the weld buildup 1d of the steel pipe 1q into a smoother convex shape on the outer surface 18b. Then, a step is taken to tighten the rain protection sheet S from the outside with a tightening belt member 22 so that the rain protection sheet S extends around the entire circumference of the steel pipe 1q, including the outer surface 18b of the elastic member 18 (step S1011). This effectively prevents a gap G from forming between the rain protection sheet S and the steel pipe 1q above the joint 2 between the steel pipe 1p and the steel pipe 1q above it. Therefore, welding work on the joint 2 between the steel pipe 1p and the steel pipe 1q can be performed even in rainy weather. In step S1003, the first double-sided tape 16 is applied so that its inner adhesive surface 16a adheres to the entire circumference of the steel pipe 1q, including the area of ​​the weld buildup 1d. Therefore, the first double-sided tape 6 is provided around the entire circumference of the steel pipe 1q, making it possible to hold the rain protection sheet S more tightly in many places around its circumference, further preventing the formation of gaps G.

[0041] Furthermore, the above mounting structure AS is equipped with a second double-sided tape 20. Therefore, in the above mounting method, following the step of attaching the elastic member 18 to the outer adhesive surface 16b of the first double-sided tape 16 (step S1005), the second double-sided tape 20 is attached so that its inner adhesive surface 20a adheres to the outer surface 18b of the elastic member 18 (step S1007). Furthermore, the rain protection sheet S is attached to the outer adhesive surface 20b of the second double-sided tape 20 so that the rain protection sheet S extends around the entire circumference of the steel pipe 1q (step S1009), and then the rain protection sheet S is tightened from the outside with a tightening belt member 22 (step S1011). This makes it possible to more effectively prevent a gap G from forming between the rain protection sheet S and the steel pipe 1q above the joint 2 between the steel pipe 1p and the steel pipe 1q above it. The water intrusion prevention structure 10 of the mounting structure AS can be configured without the second double-sided tape 20, but it is preferable to include the second double-sided tape 20 as described above. In this embodiment, the second double-sided tape 20 is applied around the entire circumference of the steel pipe 1q, including the outer surface 18b of the elastic member 18, but it may also be applied only to the outside of the outer surface 18b of the elastic member 18, or only to a limited area on the outer surface 18b and a portion of the first double-sided tape 16 on both sides thereof. This suppresses the amount to which the second double-sided tape 20 adheres to the first double-sided tape 16, making it possible to effectively utilize the second double-sided tape 20.

[0042] Furthermore, the first double-sided tape 16 has a thickness of 1 mm to 3 mm. With this configuration, the first double-sided tape 16 can undergo elastic deformation in the thickness direction according to the material of the first double-sided tape 20, and the first double-sided tape 16 can stretch and adhere to the surface of the second steel pipe 1q more flexibly. Similarly, the second double-sided tape 20 also has a thickness of 1 mm to 3 mm. By having the same configuration for the second double-sided tape 20, elastic deformation in the thickness direction according to the material of the second double-sided tape 20 can be achieved, and the second double-sided tape 20 can stretch and adhere to the surface of the elastic member 18 more flexibly. It should be noted that the first double-sided tape 16 and the second double-sided tape 20 each have a certain degree of elasticity in the thickness direction, and may be made of synthetic rubber or natural rubber, for example, acrylic rubber. As a result, the first double-sided tape 16 and the second double-sided tape 20 can each be reliably elastically deformed in the thickness direction, and thus, preferably, the formation of the gap G can be more reliably suppressed. However, it is desirable that both the first double-sided tape 16 and the second double-sided tape 20 can be repeatedly attached and detached a certain number of times or more.

[0043] In addition, a support member 30 for supporting the rain protection sheet S is positioned at the location of the second steel pipe 1q below the first double-sided tape 16. This makes it possible to spread out and position the rain protection sheet S more favorably above the joint 2 between the steel pipe 1p and the steel pipe 1q above it.

[0044] Furthermore, by installing a rain protection sheet S and performing welding work on the joint 2, it is possible to more effectively prevent moisture from reaching the joint 2. Therefore, it is possible to further reduce the possibility of hydrogen embrittlement occurring in the welded area, for example.

[0045] (Examples) As the first double-sided tape 16 and the second double-sided tape 20, OTOKU double-sided tape (2 mm thick) was used, and the rain protection sheet S was attached to the steel pipe 1 as described above using the elastic member 18 of the above shape. Then, water was poured over them, through the surface of the steel pipe 1. As a result, no seepage of rain into the rain protection sheet S or leakage of rainwater was observed at the weld buildup 1d of the steel pipe and its surroundings.

[0046] While embodiments and modifications relating thereto have been described above, this disclosure is not limited thereto. Various substitutions and modifications are possible, as long as they do not deviate from the spirit and scope of this disclosure as defined by the claims of this application.

[0047] The technology described herein is also applicable to welding steel pipes other than press-formed square steel pipes (BCP) used in building structures. For example, it can be used to weld cold-roll-formed square steel pipes (BCR), which are a type of steel pipe having welds that extend in the longitudinal direction. [Explanation of Symbols]

[0048] 1, 1p, 1q steel pipe 1d Weld build-up 2nd joint 10 Water intrusion prevention structure 16. Double-sided tape (first double-sided tape) 18 Elastic members 20 Double-sided tape (second type of double-sided tape) 22 Tightening belt component S Rain protection sheet

Claims

1. A method for attaching a welding rain protection sheet to the upper side of a joint when a second steel pipe having a longitudinally extending weld buildup is stacked on top of a first steel pipe having a longitudinally extending weld buildup, and the joint between the first and second steel pipes is welded, The process involves applying the first double-sided tape to the second steel pipe at a position above the joint such that the inner adhesive surface of the first double-sided tape adheres to the area of ​​the second steel pipe including the weld buildup, The process involves attaching an elastic member to the outer adhesive surface of the first double-sided tape, the elastic member having a concave shape corresponding to the weld buildup of the second steel pipe on its inner surface that contacts the first double-sided tape, and an outer surface extending to the back side of the inner surface, wherein the outer surface has a convex shape that is smoother than the convex shape of the weld buildup of the second steel pipe, A step of tightening the rain protection sheet from the outside with a tightening belt member so that the rain protection sheet extends around the entire circumference of the second steel pipe, including the outer surface of the elastic member. Installation method, including the method of installation.

2. A step of attaching the second double-sided tape to the outer surface of the elastic member such that the inner adhesive surface of the second double-sided tape adheres to it, The process involves attaching the rain protection sheet to the outer adhesive surface of the second double-sided tape so that the rain protection sheet extends around the entire circumference of the second steel pipe. This also includes, The mounting method according to claim 1.

3. The first double-sided tape has a thickness of 1 mm or more and 3 mm or less. The mounting method according to claim 1.

4. A support member for supporting the rain protection sheet is positioned at the location of the second steel pipe below the first double-sided tape. The mounting method according to any one of claims 1 to 3.

5. A mounting structure for a welding rain protection sheet provided above a joint when a second steel pipe having a longitudinally extending weld buildup is stacked on top of a first steel pipe having a longitudinally extending weld buildup, and the joint between the first and second steel pipes is welded, A first double-sided tape is attached to the second steel pipe at a position above the aforementioned joint, such that its inner adhesive surface adheres to the area of ​​the second steel pipe including the welded build-up portion. An elastic member having a concave portion corresponding to the weld buildup of the second steel pipe on its inner surface in contact with the first double-sided tape, and an outer surface extending to the back side of the inner surface, wherein the outer surface has a convex shape that is smoother than the convex shape of the weld buildup of the second steel pipe, A tightening belt member is provided on the outside of the rain protection sheet so that the rain protection sheet extends around the entire circumference of the second steel pipe, including the outer surface of the elastic member, and A mounting structure that includes the following features.

6. The second double-sided tape further comprises a second double-sided tape to which the inner adhesive surface of the second double-sided tape adheres to the outer surface of the elastic member and the rain protection sheet adheres to the outer adhesive surface of the second double-sided tape. The mounting structure according to claim 5.

7. The first double-sided tape has a thickness of 1 mm or more and 3 mm or less. The mounting structure according to claim 5.

8. The system further includes a support member for supporting the rain protection sheet, which is provided at the position of the second steel pipe below the first double-sided tape. The mounting structure according to any one of claims 5 to 7.

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