Fitting structure of cured rain protection sheet for welding

Abstract

To provide a fitting structure of a cured rain protection sheet for welding which can weld steel pipes including a steep pipe with a seam so as to vertically connect the steel pipes in even rainy weather, and can be flexibly applied, for example, between steel pipes with a certain degree of variation in weld overlay.SOLUTION: A fitting structure of a cured rain protection sheet comprises: a framework support frame 12 provided around a second steep pipe 1q which is stacked on top of a first steel pipe 1q; and a support member which is provided on the framework support frame so as to extend outside the second steel pipe from the framework support frame, and supports the cured rain protection sheet. The framework support frame 12 comprises a band member wound around the second steel pipe, and an adjustment mechanism 54 which adjusts tensile force of the band member around the second steel pipe.SELECTED DRAWING: Figure 14

Description

Technical Field

[0001] The present disclosure relates to an attachment structure for a rain curing sheet for welding.

Background Art

[0002] In the construction work of a building having a steel column such as a steel frame structure, when erecting the column, steel column members of appropriate lengths are stacked vertically from the foundation of the building, and the joints of each member are welded at the construction site and erected as a column. The welding work of steel columns at the construction site may be carried out in almost the same environment as outdoor work that is affected by rain or the like.

[0003] Patent Document 1 discloses a temporary rain and wind protection device for welding steel columns that enables welding work even in rainy days or strong winds. In order to perform the welding work of the joints of the steel columns, framework support members are arranged in two upper and lower stages on the upper steel column at an appropriate position away from the welding position (joint). At this time, when fixing the framework support frame of the upper framework support member around the steel column, the base end of the drain member is sandwiched between the column surface contact portion of the framework support frame and the column surface, and the base end of the drain member is brought into close contact with the column surface. After providing the framework support members on the steel column, the base ends of the pipe arms are connected to each of the support plates provided at the four corners of the upper framework support member and the support plates provided between the corners and the corner portions. Then, a pipe brace is provided between the connecting plate in the middle of each pipe arm and the support plate of the corresponding lower framework support member, and a tie rod is provided between the locking projection plates of the pipe arms to provide a framework around the steel column. After assembling the framework, a rainproof sheet is placed on the upper surface of the framework, and a windproof sheet is suspended from each tie rod at the tip of the framework to complete the rain and wind protection device. This rain and wind protection device can perform welding work without being affected by rain or wind by performing welding work in a space partitioned by a sheet, and it is possible to work according to the schedule regardless of the weather, as described in Patent Document 1.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 10-109176 [Summary of the Invention] [Problems to be Solved by the Invention]

[0005] Now, press-formed square steel pipes for building structures (BCP), steel pipes with welded joints extending in the longitudinal direction such as box columns, are actually used as steel column members, that is, column members of steel frames. The press-formed square steel pipe is manufactured by press-forming the corner portions of the steel pipe, arranging two press-formed bodies facing each other, and welding the butting portions. Also, a box column is a steel pipe that can be manufactured with a larger diameter than steel pipes such as press-formed square steel pipes, and is more suitable as a column member for super high-rise buildings and the like. A box column is manufactured by welding four thick plates and has a square or rectangular cross-section. Therefore, unlike a press-formed square steel pipe formed into a square column by bending a steel plate rolled into a plate shape, a box column is manufactured by welding and assembling four steel plates, so the corners (corner portions) are formed at right angles. When using such a steel pipe as a steel column member, the welded bead on the outer surface is exposed, and the welded bead extends continuously in the longitudinal direction of the steel column member. In order to connect such a square steel pipe with a seam (seam) vertically, that is, in the longitudinal direction, at a construction site, it is desired to perform the welding work of the seams of these steel pipes even in rainy weather. In such a steel pipe with a seam, there is usually variation in the state of the welded bead of the seam (for example, variation in the weld bead thickness of about 2 mm), and there is a possibility that the variation becomes larger to a certain extent. Depending on the degree of variation, an error that cannot be ignored in the circumferential length or shape of the steel pipe may occur between the steel pipes. However, since the above-described device in Patent Document 1 does not assume such a welded bead portion of a square column steel pipe with a seam, that is, a steel pipe having a welded bead extending in the longitudinal direction, there is a limit in applying a uniform framework support frame between steel pipes of the same standard. Also, even for a steel pipe without a seam, depending on the surface condition and the like, an error (for example, an error in the order of mm) that cannot be ignored in the circumferential length or shape of the steel pipe may occur between the steel pipes, and in this case as well, it is desired to provide the framework flexibly.

[0006] An object of the present disclosure is to provide an attachment structure for a welding rain curing sheet that enables welding to connect steel pipes including steel pipes with seams even in rainy weather and can be flexibly applied between steel pipes having, for example, a certain degree or more of variation in the welded bead.

Means for Solving the Problem

[0007] One aspect of the present disclosure is a mounting structure of a welding rain curing sheet provided above a joint when stacking a second steel pipe on a first steel pipe and welding the joint between the first steel pipe and the second steel pipe, a framework support frame provided around the second steel pipe, and a support member provided on the framework support frame so as to extend outward from the framework support frame to support the rain curing sheet and comprising the framework support frame includes a band member wound around the second steel pipe, and an adjustment mechanism configured to adjust the tension of the band member around the second steel pipe and comprising a mounting structure of a welding rain curing sheet is provided.

[0008] According to the above configuration, since the tension of the band member wound around the second steel pipe can be adjusted by the adjustment mechanism, it can flexibly respond according to, for example, the degree of build-up welding in the second steel pipe, and a framework support frame can be firmly provided around the second steel pipe. Thereby, a support member can be firmly provided so as to extend outward from the second steel pipe, and the rain curing sheet can be preferably supported. Therefore, welding for connecting steel pipes vertically can be preferably performed even in rainy weather.

[0009] Preferably, the adjustment mechanism includes a female screw hole provided in the band member, and a male screw member that is screwed into the female screw hole and is provided so as to be able to advance and retreat in the female screw hole. The male screw member may be screwed into the female screw hole so that the tip of the male screw member is pressed against the outer surface of the second steel pipe. According to this configuration, the tension of the band member of the framework support frame can be adjusted by adjusting the degree of screwing of the male screw member into the female screw hole.

[0010] Preferably, the band member includes a hinge mechanism and a fastener for fastening both ends of the band member so as to close the band member around the second steel pipe. According to this configuration, the band member can be easily attached around the second steel pipe.

[0011] Preferably, the above-described mounting structure further includes a second framework support frame provided around the second steel pipe below the framework support frame in the second steel pipe, and the second framework support frame preferably includes a crutch member that extends to support the support member. According to this configuration, the support member extending from the framework support frame can be more suitably supported using the crutch member.

[0012] Preferably, the above-described mounting structure further includes a spacer member provided between the framework support frame and the second framework support frame. According to this configuration, the relative arrangement of the framework support frame and the second framework support frame can be made more suitable using the spacer member.

[0013] Preferably, the above-described mounting structure is attached so that the inner adhesive surface adheres to a region including a welded build-up portion where the inner adhesive surface extends in the longitudinal direction of the second steel pipe at a position of the second steel pipe above the framework support frame, and has a concave shape portion corresponding to the welded build-up of the second steel pipe on the inner surface in contact with the first double-sided tape, and an elastic member having an outer surface extending to the back side of the inner surface, the outer surface having a convex shape smoother than the convex shape of the welded build-up of the second steel pipe, and a tightening belt member provided outside the rain protection sheet so that the rain protection sheet extends over the entire circumference of the second steel pipe including the outer surface of the elastic member. According to this configuration, it is possible to suitably prevent a gap from occurring between the rain protection sheet and the second steel pipe above the joint between the first steel pipe and the second steel pipe. Therefore, even in rainy weather, it becomes more possible to surely perform the welding work at the joint between the first steel pipe and the second steel pipe.

[0014] Preferably, the above-mentioned attachment structure is a second double-sided tape, and the inner adhesive surface of the second double-sided tape is attached to the outer surface of the elastic member, and the rain-proof sheet is attached to the outer adhesive surface of the second double-sided tape. According to this configuration, it is possible to more preferably prevent a gap from occurring between the rain-proof sheet and the second steel pipe.

[0015] Preferably, the first double-sided tape has a thickness of 1 mm or more and 3 mm or less. According to this configuration, even in the thickness direction of the first double-sided tape, elastic deformation according to the material of the first double-sided tape in the thickness direction becomes possible, and the first double-sided tape can extend 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 or more and 3 mm or less. By also providing this configuration for the second double-sided tape, elastic deformation according to the material of the second double-sided tape in the thickness direction becomes possible, and the second double-sided tape can extend and adhere to the surface of the elastic member more flexibly. Note that the first double-sided tape and the second double-sided tape preferably each have a certain degree or more of elasticity in the thickness direction. For example, they may be made of synthetic rubber or natural rubber, and for example, they may be manufactured using acrylic rubber. Thereby, the first double-sided tape and the second double-sided tape can each be more reliably elastically deformed in the thickness direction. However, it is preferable that both the first double-sided tape and the second double-sided tape can be repeatedly attached and peeled off a certain number of times or more.

Advantages of the Invention

[0016] According to the framework structure of the rain-proof sheet for welding of the above aspect of the present disclosure, since it has the above configuration, for example, a flexible framework support frame can be applied and firmly provided around a second steel pipe with a certain degree of variation in the weld build-up, and thus the rain-proof sheet can be firmly supported by the support member. As a result, it becomes possible to more preferably perform the welding connecting the steel pipes above and below even in rainy weather.

Brief Description of the Drawings

[0017]

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Figure 18

[0018] Hereinafter, embodiments according to the present disclosure will be described based on the accompanying drawings. The same parts (or components) are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0019] The attachment method and attachment structure of a rain curing sheet for welding according to an embodiment of the present disclosure will be described based on the drawings.

[0020] FIG. 1 is a diagram showing a steel pipe 1 with a joint as an example, (a) is a plan view thereof, and (b) is a front view thereof. The steel pipe 1 is a press-formed square steel pipe (BCP), which is created by arranging two press-formed bodies 1a and 1b made by press-forming the corner portions of the steel pipe facing each other and welding the butting portions therebetween, and forms all or part of a steel column, that is, a column member. In this steel pipe 1, the butting surfaces of the press-formed bodies 1a and 1b, that is, the joint, extends in its longitudinal direction 1c, and a weld buildup 1d extends there.

[0021] Here, the steel pipe 1 serves as a column member and is provided so that its longitudinal direction 1c extends in the vertical direction. Then, as shown in FIG. 2, another steel pipe 1 is stacked on it. In FIG. 2, the lower steel pipe 1 corresponds to the first steel pipe and is denoted by the reference numeral 1p, and the upper steel pipe 1 corresponds to the second steel pipe and is denoted by the reference numeral 1q.

[0022] The joint 2 between the steel pipes 1p and 1q is generally welded, but the welding operation cannot be carried out in rainy weather. Therefore, as shown in FIG. 3, in order to improve the welding work efficiency by performing the welding operation even in rainy weather, a rain curing sheet S is attached above the joint 2, preferably at a position a predetermined distance above the joint 2. Since the rain curing sheet S is provided at the position of the steel pipe 1q above the joint 2 during welding of the joint 2, it is preferable to have a certain degree of heat resistance and the property of not allowing water to pass through.

[0023] In FIG. 2, on the steel pipe 1q on the steel pipe 1p, the water intrusion prevention part structure 10, the framework support frame (hereinafter, the first framework support frame) 12, and the framework support frame (hereinafter, the second framework support frame) 14 in the attachment structure AS of the welding rain curing sheet S described below are shown in order from above. The first framework support frame 12 and the second framework support frame 14 each serve as the base of the framework that supports the rain curing sheet S, and can be referred to as, for example, the framework base, and may be integrally formed into one framework base, or may be further divided.

[0024] The water intrusion prevention part structure 10 is configured so that water does not drip inside the rain curing sheet S along the surface of the steel pipe 1q or the like. Generally, when the rain curing sheet S is simply attached to the steel pipe 1q having the weld build-up 1d with a member such as a string, as schematically shown in FIG. 4, a gap G is formed inside the rain curing sheet S around the weld build-up 1d. This is because there is variation in the surface shape of the weld build-up 1d and it has, for example, an outer surface that is convexly curved as shown in FIG. 4. Therefore, in order to prevent the formation of the gap G, the water intrusion prevention part structure 10 having the following configuration is provided on the outer surface of the steel pipe 1q, preferably over its entire circumference, when attaching the rain curing sheet S.

[0025] As shown in Fig. 5, the water intrusion prevention part structure 10 includes 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 curing sheet S is attached to the outside of the second double-sided tape 20, and a tightening belt member 22 is arranged thereon. In the drawings, the first double-sided tape 16 and the second double-sided tape 20 are each shown by a broken line to make it easier to see the arrangement relationship with adjacent members 18, S, etc.

[0026] The first double-sided tape 16 is directly attached to the steel pipe 1q such that the inner adhesive surface 16a is attached to the region including the welded build-up 1d of the steel pipe 1q at the position of the steel pipe 1q above the joint 2, more specifically, at the position of the steel pipe 1q above the first framework support frame 12. In this embodiment, the first double-sided tape 16 is directly attached to the steel pipe 1q such that the inner adhesive surface 16a is attached over the entire circumference including the welded build-up 1d of the steel pipe 1q at the position of the steel pipe 1q above the joint 2. Here, the first double-sided tape 16 has a thickness of 1 mm or more and 3 mm or less, 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 is preferably elastically deformable in the thickness direction, that is, it preferably has a certain degree or more of elasticity in the thickness direction. For example, it may be made of synthetic rubber or natural rubber, and for example, it may be made using acrylic rubber. And the first double-sided tape 16 should be able to be repeatedly attached and removed a certain number of times or more. The width of the first double-sided tape 16 is preferably 1 cm or more, and preferably has a width of 2 cm or more and 10 cm or less, but is not limited to this width.

[0027] The elastic member 18 is a member provided outside the first double-sided tape 16, that is, on the radially outer side of the axis of the steel pipe 1q when centered on the axis of the steel pipe 1q. The elastic member 18 is configured to have a function of converting the convex shape of the weld build-up 1d of the steel pipe 1q into a smoother convex shape. Since the second double-sided tape 20 is used in the present embodiment, the elastic member 18 is provided between the first double-sided tape 16 and the second double-sided tape 20. A perspective view of the elastic member 18 is shown in FIG. 6. The elastic member 18 is preferably provided at a location excluding the corners of the steel pipe 1q and is configured to be disposed on the side surface of the steel pipe 1q having the weld build-up 1d of the steel pipe 1q. Here, the elastic member 18 is a member having a substantially triangular prism shape. Therefore, when the elastic member 18 is disposed with respect to the steel pipe 1q, it has an upper surface 18d located on the upper side, a lower surface 18e located on the lower side, and a circumferential side surface 18f extending between them and extending in the circumferential direction of the steel pipe 1q. The circumferential side surface 18f is configured to have an inner surface 18a and an outer surface 18b. In particular, the circumferential side surface 18f is substantially composed of only the inner surface 18a and the outer surface 18b. The width corresponding to the vertical direction, that is, the width direction W, of the elastic member 18 preferably has 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, that is, the length between the upper surface 18d and the lower surface 18e, has substantially the same width 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 a surface that contacts the first double-sided tape 16 and adheres to the outer adhesive surface 16b of the first double-sided tape 16. And the outer surface 18b is a surface that adheres to the inner adhesive surface 20a of the second double-sided tape 20. The inner surface 18a is a flat surface, but has a concave-shaped portion 18c approximately at the center in its longitudinal direction L corresponding to the weld build-up 1d of the steel pipe 1q. The concave-shaped 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-shaped portion 18c is preferably designed to conform to the shape of the weld build-up 1d of the steel pipe 1q as much as possible. And the elastic member 18 can be attached to the outside of the first double-sided tape 16 so that the weld build-up 1d fits into this concave-shaped 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 when centered on 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 shape that is thinnest at both ends where it is connected to the inner surface 18a and protrudes most from the inner surface 18a at a substantially central position away from both ends. Therefore, the outer surface 18b is configured as a smoother surface than the concave-shaped portion 18c, that is, a surface having a convex curved shape that is smoother than the convex shape of the weld build-up 1d. As is clear from FIGS. 5(a) to (c), the convex curved shape of the outer surface 18b is smoother than the convex curved shape of the corresponding weld build-up 1d of the concave-shaped portion 18c.

[0028] The elastic member 18 is here composed of expanded polystyrene. Therefore, it has a certain degree of elasticity and can be elastically deformed by an external force. Thus, even if there is a certain degree of variation in the shape of the weld build-up 1d, the elastic member 18 can flexibly adapt to the shape. Note that the elastic member 18 is not limited to being made of expanded polystyrene, and may be composed of an elastic body such as a foaming material other than expanded polystyrene, synthetic rubber, or natural rubber.

[0029] The second double-sided tape 20 is attached so that the inner adhesive surface 20a of the second double-sided tape 20 adheres to the outer surface 18b of the elastic member 18. In the present embodiment, the second double-sided tape 20 is attached so that the inner adhesive surface 20a of the second double-sided tape 20 adheres over 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 partially adheres to the outer surface 18b of the elastic member 18 and partially adheres to the outer adhesive surface 16b of the first double-sided tape 16, but a thin sheet material such as paper may be disposed between the first double-sided tape 16 and the second double-sided tape 20 so that they can be separated from the first double-sided tape 16. Here, the second double-sided tape 20 has a thickness of 1 mm or more and 3 mm or less, 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, has a certain degree of elasticity or more in the thickness direction. For example, it may be made of synthetic rubber or natural rubber, and for example, it may be made using acrylic rubber. And the second double-sided tape 20 is preferably capable of being 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, and preferably has a width of 2 cm or more and 10 cm or less, 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 the same thickness, but may have a different width and a different thickness from the first double-sided tape 16. Also, the second double-sided tape 20 may be made of a material different from that of the first double-sided tape 16.

[0030] Then, as shown in FIG. 7, a rain protection sheet S is attached to the outer adhesive surface 20b of the second double-sided tape 20. When shown in FIG. 3 or FIG. 7, the rain protection sheet S is attached to the second double-sided tape 20 so as to hang down from the second double-sided tape 20, that is, the water intrusion prevention part structure 10, leaving a little of the sheet fabric on the upper side of the second double-sided tape 20. Here, the rain protection sheet S is a single sheet and is attached to the second double-sided tape 20 so as to be wound around the steel pipe 1q.

[0031] The tightening belt member 22 is a member used to tighten, from the outside thereof, the first double-sided tape 16 disposed around the steel pipe 1q, the elastic member 18, the second double-sided tape 20, and the rain protection sheet S. The tightening belt member 22 is a single belt member and is configured as a member that can be formed into an annular shape. A so-called clamping belt may be used as the tightening belt member 22.

[0032] As shown in FIG. 8, when the tightening belt member 22 is tightened from the outside of the rain protection sheet S, forces F1 and F2 along the belt member 22 are generated in the tightening belt member 22. As a result, forces F3 and F4 that press against the steel pipe 1q from the outside to the inside act on the rain protection sheet S, the second double-sided tape 20, the elastic member 18, and the first double-sided tape 16. Thereby, in the elastic member 18, forces F3 and F4 act in a direction to crush the concave portion 18c, attempting to more surely eliminate the gap G (see FIG. 4) around the weld build-up 1d. It should be naturally understood that, as described above, the elastic member 18 is provided, for example, while using the first double-sided tape 16, for each weld build-up 1d of the steel pipe 1q.

[0033] Now, the frame structure 50 including the first frame support frame 12 and the second frame support frame 14, which is attached to the position of the steel pipe 1q below the water intrusion prevention part structure 10, will be described below. The frame structure 50 constitutes a part of the attachment structure AS of the welding rain protection sheet S.

[0034] Figures 9 to 12 show the upper steel pipes 1p and 1q stacked one on top of the other, with the framework structure 50 provided on the upper steel pipe 1q. In Figures 9 to 12, the framework structure 50 is shown, and the above-described water intrusion prevention part structure 10 is not illustrated. Figure 9 is a plan view of the steel pipes 1p and 1q provided with the framework structure 50 as viewed from above, and an example of the curing sheet S covering the framework structure 50 is shown by a broken line. Figure 10 is a front view of the steel pipes 1p and 1q provided with the framework structure 50, Figure 11 is a rear view of the steel pipes 1p and 1q provided with the framework structure 50, and Figure 12 is a side view of the steel pipes 1p and 1q provided with the framework structure 50. In Figures 9 to 12, the weld build-up 1d appears in the front view and the rear view, but this does not fix the positional relationship between the weld build-up 1d and the framework structure 50. For example, the fastener 58 of the band member 52 described later does not have to be on the same side as the weld build-up 1d and may be located on the side without the weld build-up 1d.

[0035] The first framework support frame 12 is provided around the steel pipe 1q, that is, so as to extend around. The first framework support frame 12 includes a band member 52 wound around the steel pipe 1q and an adjustment mechanism 54 configured to adjust the tension of the band member 52 around the steel pipe 1q.

[0036] The band member 52 includes a hinge mechanism 56 and a fastener 58 that fastens both ends of the band member 52 so as to close the band member 52 around the steel pipe 1q. The band member 52 is made of metal, here, formed by joining steel plates. A hinge mechanism 56 is provided at the joint. Therefore, the band member 52 can bend and expand and contract the space inside the band member 52. For example, by providing the hinge mechanism 56, the band member 52 can extend in an elongated strip shape. The band member 52 is configured to form a square frame around the steel pipe 1q, includes a hinge mechanism 56 at approximately the center of the portion corresponding to three surfaces, and includes a fastener 58 at the portion corresponding to the remaining one surface. The fastener 58 includes a fastening member 58a provided at one end of the band member 52 and a fastened member 58b provided at the other end of the band member 52 to which the fastening member 58a is applied (see FIGS. 14 and 16). The fastener 58 is here a fastener fitting (so-called draw latch), particularly a fastener fitting with an adjustment function for the hanging allowance, but it may be a simple fastener fitting or any other fastener. The fastener 58 may be a turnbuckle.

[0037] From the first framework support frame 12, a support member 60 is provided so as to extend outside the steel pipe 1q. In the plan view of FIG. 9, the support member 60 is provided on the first framework support frame 12 so as to extend substantially at a right angle to the corresponding surface of the steel pipe 1q. The first framework support frame 12 includes two support members 60 for each surface of the steel pipe 1q, and a total of eight support members 60. However, the number and arrangement of the support members 60 are not limited to this. As shown in FIGS. 10 to 12, the support member 60 extends so as to incline downward from the first framework support frame 12. As shown in FIGS. 10 to 12, the support member 60 is supported by an auxiliary crutch member 62 extending from the first framework support frame 12. One support member 60 and one auxiliary crutch member 62 are paired and integrally formed by a connecting member 66 that is inserted and fixed into the fitting groove portion 64 of the first framework support frame 12 so as to extend in the vertical direction. The fitting groove portion 64 is open at the upper side and closed at the lower side. As shown in FIG. 13, which is an enlarged view of part XIII in FIG. 9, the connecting member 66 is configured in a T shape, and the fitting groove portion 64 is also configured in a T shape. Therefore, by fitting the connecting member 66 into the fitting groove portion 64 from the upper side, the connecting member 66 is attached to the fitting groove portion 64, and thus the support member 60 supported by the auxiliary crutch member 62 is attached to the first framework support frame 12.

[0038] In order to provide a crutch member (hereinafter, main crutch member) 68 that supports the support member 60 extending from the first framework support frame 12, a second framework support frame 14 is provided around the steel pipe 1q below the first framework support frame 12 in the steel pipe 1q. The second framework support frame 14 also has the same configuration as the first framework support frame 12, and includes a band member 70 wound around the steel pipe 1q and an adjustment mechanism 72 configured to adjust the tension of the band member 70 around the steel pipe 1q.

[0039] The band member 70 includes a hinge mechanism 74 and a fastener 76 that fastens both ends of the band member 70 so as to close the band member 70 around the steel pipe 1q. As shown in FIG. 10, the band member 70 may be provided such that the fastener 76 is located on the same side as the fastener 58 of the band member 52. The band member 70 is formed by joining metal, here steel plates. The hinge mechanism 74 is provided at the joint. Therefore, the band member 70 can bend and expand and contract the space inside the band member 70. For example, by including the hinge mechanism 74, the band member 70 can extend in an elongated strip shape. The band member 70 is configured to form a rectangular frame around the steel pipe 1q, includes a hinge mechanism 74 at approximately the center of the portion corresponding to three surfaces, and includes a fastener 76 at the portion corresponding to the remaining one surface. The fastener 76 includes, similar to the fastener 58, a fastening member provided at one end of the band member 70 and a fastened member provided at the other end of the band member 70 to which this fastening member is applied. The fastener 76 is, similar to the fastener 58, here a snap fastener fitting (so-called draw latch), particularly a snap fastener fitting with an adjustment function for the hanging allowance, but it may be a simple snap fastener fitting or any other fastener. The fastener 76 may be a turnbuckle. Note that the fastener 76 may have a configuration different from that of the fastener 58.

[0040] From the first framework support frame 12, a main crutch member 68 is provided so as to extend outside the steel pipe 1q. The attachment mechanism of the main crutch member 68 will not be described in detail, but is the same as the attachment mechanism of the support member 60, and includes a fitting groove portion of the second framework support frame 14 and a connecting member that is inserted and fixed therein and to which the main crutch member 68 is provided.

[0041] The first frame support frame 12 and the second frame support frame 14 are provided substantially horizontally, and a spacer member 78 is used to keep their relative positions constant. The spacer member 78 is a flat and elongated member having holes into which screws 78s are inserted at both ends. Here, as shown in FIGS. 9 and 12, the spacer member 78 is provided to connect the first frame support frame 12 and the second frame support frame 14, and is fixed to each of the first frame support frame 12 and the second frame support frame 14 with the screws 78s. Here, the spacer member 78 is positioned on both side surfaces that are neither the side where the fastener 58 is provided nor the side of the adjustment mechanism 54. Specifically, here, the adjustment mechanism 54 is provided on the back side of the fastener 58. As shown in FIG. 12, two spacer members 78 are provided on each of the left and right sides. However, the configuration, arrangement, and number of the spacer members 78 are not limited to this.

[0042] In this way, the first frame support frame 12 and the second frame support frame 14 are provided on the steel pipe 1q. However, in the steel pipe 1q, although it is manufactured with the same specifications, there are variations in the degree of unevenness such as the weld build-up 1d, and variations can occur in the surrounding length. Even when there are such variations, in order to preferably attach each of the first frame support frame 12 and the second frame support frame 14 to the steel pipe 1q with a certain amount of tension, the aforementioned adjustment mechanisms 54 and 72 are provided on each of the first frame support frame 12 and the second frame support frame 14.

[0043] FIG. 14 shows a cross-sectional view taken along line XIV-XIV of FIG. 10. In FIG. 14, the connecting member 66 and the fitting groove portion 64 to which the support member 60 is connected are omitted. And FIG. 15 shows an enlarged view of the XV portion of FIG. 14.

[0044] The adjustment mechanism 54 in the first framework support frame 12 includes a female screw hole 80 provided in the band member 52 and a male screw member 82 that is screwed into the female screw hole 80 and is provided so as to be able to advance and retreat in the female screw hole 80. The male screw member 82 and the female screw hole 80 are provided in pairs. Here, the female screw hole 80 is formed in the band member 52 by fixing a nut member 80a having the female screw hole 80 to the band member 52, for example, by welding. This female screw hole 80 overlaps with a hole 52a that extends in the thickness direction A1 of the band member 52 and penetrates the band member 52, and has an inner diameter equal to or less than the inner diameter of the hole 52a. The female screw hole 80 is provided so as to extend in the thickness direction A1 of the band member 52. Therefore, by adjusting the degree of screwing of the male screw member 82 into the female screw hole 80, the male screw member 82 can move forward and backward in the thickness direction A1 of the band member 52. As a result, the tip 82a of the male screw member 82 protrudes inside the band member 52 of the first framework support frame 12 and can extend toward the steel pipe 1q when the band member 52 is attached to the steel pipe 1q. Here, the male screw member 82, which is a bolt, extends, for example, substantially at a right angle to the outer surface of the steel pipe 1q, and its tip 82a can contact the outer surface of the steel pipe 1q from a direction substantially at a right angle. Then, the male screw member 82 is screwed into the female screw hole 80 so that the tip 82a of the male screw member 82 is pressed against the outer surface of the steel pipe 1q. By adjusting the degree of advancement and retreat of the male screw member 82 with respect to the female screw hole 80, the tension of the band member 52 can be adjusted. Therefore, the first framework support frame 12 can be removably fixed to the steel pipe 1q only by that tension. However, the adjustment mechanism 54 in the present disclosure is not limited to providing the female screw hole 80 using the nut member 80a, and the female screw hole 80 may be provided directly by the band member 52, for example, without using the nut member 80a. This is the same for the adjustment mechanism 72. Incidentally, the parallel positioning of the first framework support frame 12 may be performed using a level or the like. For example, the first framework support frame 12 may be placed on a plurality of magnets installed on the steel pipe 1q using a level to perform the parallel positioning of the first framework support frame 12. This is the same for the second framework support frame 14.

[0045] Note that, as shown in FIG. 11, here, the male screw member 82 of the adjustment mechanism 54 is provided on the back side of the fixture 58 in the steel pipe 1q, and two are provided on each side of the hinge mechanism 56. This corresponds to the relatively long vertical length of the band member 52. The arrangement and number of the male screw members 82 of the adjustment mechanism 54 are not limited to this.

[0046] Similarly, the adjustment mechanism 72 in the second framework support frame 14 includes a female screw hole 84 provided in the band member 70 and a male screw member 86 that is screwed into the female screw hole 84 and is provided so as to be able to advance and retreat in the female screw hole 84. The male screw member 86 and the female screw hole 84 are provided in pairs. Here, the female screw hole 84 is formed in the band member 70 by fixing a nut member 84a having the female screw hole 84 to the band member 70, for example, by welding. This female screw hole 84 overlaps with a hole 70a that extends in the thickness direction of the band member 70 (see direction A1 in FIG. 15) and penetrates the band member 70, and has an inner diameter equal to or less than the inner diameter of the hole 70a. The female screw hole 84 is provided so as to extend in the thickness direction of the band member 70. Therefore, by adjusting the degree of screwing of the male screw member 86 into the female screw hole 84, the male screw member 86 can move forward and backward in the thickness direction of the band member 70. As a result, the tip 86a of the male screw member 86 protrudes inside the band member 70 of the second framework support frame 14 and can extend toward the steel pipe 1q when the band member 70 is attached to the steel pipe 1q. This male screw member 86 extends, for example, substantially at a right angle to the outer surface of the steel pipe 1q, and its tip 86a can contact the outer surface of the steel pipe 1q from a direction substantially at a right angle. Then, the male screw member 86 is screwed into the female screw hole 84 so that the tip 86a of the male screw member 86 is pressed against the outer surface of the steel pipe 1q. By adjusting the degree of advancement and retreat of the male screw member 86 with respect to the female screw hole 84, the tension of the band member 70 can be adjusted. Therefore, only by that tension, the second framework support frame 14 can be removably fixed to the steel pipe 1q. The arrangement and number of the male screw members 86 of the adjustment mechanism 72 are not limited to this. This adjustment mechanism 72 is different from the above adjustment mechanism 54 in the number of pairs of the female screw hole 80 and the male screw member 82 and the number of pairs of the female screw hole 84 and the male screw member 86, but has a substantially same configuration. In FIG. 15, the reference numerals of the respective components of the adjustment mechanism 72 are shown in parentheses following the reference numerals of the respective components of the adjustment mechanism 54 of the first framework support frame 12 corresponding to the respective components of the adjustment mechanism 72 in the second framework support frame 14.

[0047] The first framework support frame 12 and the second framework support frame 14, which have already been described, are each provided with the hinge mechanisms 56 and 74. In the first framework support frame 12, the band member 52 is configured to form a square frame around the steel pipe 1q, is provided with the hinge mechanism 56 at approximately the center of three sides, and is provided with the fastener 58 on the remaining one side. Therefore, by detaching the fastener 58, as shown in FIG. 16, the band member 52 can be bent and unfolded. Thus, by simply arranging, winding, fastening the fastener 58, and then adjusting the adjustment mechanism 54 as described above around the steel pipe 1q, the band member 52 can be provided and fixed around the steel pipe 1q in a taut state with a certain amount of tension. The same applies to the band member 70 of the second framework support frame 14.

[0048] Here, an example of the process of attaching the rain protection sheet S to the portion of the steel pipe 1q above the joint 2 will be described based on the flowchart of FIG. 17. However, it should be understood from the above description that various process sequences other than the process sequence shown in FIG. 17 are possible.

[0049] First, the first framework support frame 12 and the second framework support frame 14 are attached (step S1701). Then, the first double-sided tape 16 is attached (step S1703). Next, the elastic member 18 is attached (step S1705), the second double-sided tape 20 is attached (step S1707), and the rain protection sheet S is attached (step S1709). Thereafter, the tightening belt member 22 is attached (step S1711), the tape member 40 is attached to fix the upper end portion Sa (see FIG. 3) of the rain protection sheet S (step S1713), and the support member 60 and the crutch members 62 and 68 are attached (step S1715). As a result, the rain protection sheet S is preferably attached to the steel pipe 1q, and welding of the joint 2 can be preferably performed even in rainy weather. The welding of the joint 2 may be performed manually by an operator, but it is preferably performed by an automatic welding machine (not shown).

[0050] The following describes some characteristic configurations in the attachment structure AS of the rain protection sheet S for welding described above and the effects thereof.

[0051] The attachment structure AS of the above-described rain protection sheet S for welding is directed to providing the rain protection sheet S for welding above the joint 2 when stacking the steel pipe 1q, which is the second steel pipe, on the steel pipe 1p, which is the first steel pipe, and welding the joint 2 between the steel pipe 1p and the steel pipe 1q. The attachment structure AS includes a first framework support frame 12 provided around the steel pipe 1q, and a support member 60 provided on the first framework support frame 12 so as to extend outward from the first framework support frame 12 to support the rain protection sheet S. The first framework support frame 12 includes a band member 52 wound around the steel pipe 1q and an adjustment mechanism 54 configured to adjust the tension of the band member 52 around the steel pipe 1q. According to this configuration, since the tension of the band member 52 wound around the steel pipe 1q can be adjusted by the adjustment mechanism 54, it is possible to flexibly respond according to, for example, the thickness of the weld build-up 1d in the steel pipe 1q, and the first framework support frame 12 can be firmly provided around the steel pipe 1q. Thereby, the first framework support frame 12 can be firmly provided so that the support member 60 extends outward from the steel pipe 1q, and the rain protection sheet S can be preferably supported. Therefore, the welding connecting the steel pipes 1p and 1q vertically can be preferably performed even in rainy weather.

[0052] Further, the adjustment mechanism 54 in the first framework support frame 12 includes a female screw hole 80 provided in the band member 52, and a male screw member 82 that is screwed into the female screw hole 80 and is provided so as to be able to advance and retreat in the female screw hole 80. Then, the male screw member 82 is screwed into the female screw hole 80 so that the tip 82a of the male screw member 82 is pressed against the outer surface of the steel pipe 1q. According to this configuration, the tension of the band member 52 of the first framework support frame 12 can be adjusted by adjusting the degree of screwing of the male screw member 82 into the female screw hole 80.

[0053] The band member 52 includes a hinge mechanism 56 and a fastener 58 that fastens both ends of the band member 52 so as to close the band member 52 around the steel pipe 1q. According to this configuration, the band member 52 can be easily attached around the steel pipe 1q.

[0054] In addition, the mounting structure AS further includes a second framework support frame 14 provided around the steel pipe 1q below the first framework support frame 12 in the steel pipe 1q. The second framework support frame 14 includes a main cheek support member 68 that extends to support the support member 60. According to this configuration, the support member 60 extending from the first framework support frame 12 can be more suitably supported using the main cheek support member 68.

[0055] In addition, the above-described mounting structure AS includes a spacer member 78 provided between the first framework support frame 12 and the second framework support frame 14. According to this configuration, the relative arrangement of the first framework support frame 12 and the second framework support frame 14 can be made more suitable using the spacer member 78.

[0056] In addition, the attachment structure AS for attaching the rain protection sheet S for welding to the upper side of the joint 2 includes a first double-sided tape 16, an elastic member 18, and a tightening belt member 22. First, a step of attaching the first double-sided tape 16 is performed such that the inner adhesive surface 16a of the first double-sided tape 16 is attached to a region including the welded build-up 1d of the steel pipe 1q above the joint 2 at the position of the steel pipe 1q above the joint 2. Then, an elastic member 18 having a concave-shaped portion 18c corresponding to the welded build-up 1d of the steel pipe 1q on the inner surface 18a in contact with the first double-sided tape 16 and having an outer surface 18b extending to the back side of the inner surface 18a is attached to the outer adhesive surface 16b of the first double-sided tape 16. At this time, the elastic member 18 can be attached to the outside of the first double-sided tape 16 so that the welded build-up 1d fits into the concave-shaped portion 18c. Thus, the elastic member 18 can function so as to convert the convex shape of the welded build-up 1d of the steel pipe 1q into a smoother convex shape of the outer surface 18b. Then, a step of tightening with the tightening belt member 22 from the outside of the rain protection sheet S is performed so that the rain protection sheet S extends over the entire circumference of the steel pipe 1q including the outer surface 18b of the elastic member 18. Thereby, it is possible to suitably prevent the above-mentioned gap G from occurring between the rain protection sheet S and the steel pipe 1q on the upper side of the joint 2 between the steel pipe 1p and the steel pipe 1q above it. Therefore, even in rainy weather, it becomes possible to perform the welding work of the joint 2 between the steel pipe 1p and the steel pipe 1q. Here, a step of attaching the first double-sided tape 16 is performed such that the inner adhesive surface 16a of the first double-sided tape 16 is attached over the entire circumference including the position of the welded build-up 1d of the steel pipe 1q. Therefore, the first double-sided tape 6 is provided over the entire circumference of the steel pipe 1q, and it becomes possible to hold the rain protection sheet S in closer contact at many positions over the entire circumference, and it becomes possible to further prevent the gap G from occurring.

[0057] Furthermore, the mounting structure AS includes a second double-sided tape 20. Therefore, in the above mounting method, after the step of attaching the elastic member 18 to the outer adhesive surface 16b of the first double-sided tape 16, a step of attaching the second double-sided tape 20 is performed such that the inner adhesive surface 20a of the second double-sided tape 20 is attached to the outer surface 18b of the elastic member 18. Further, a step of attaching the rain protection sheet S to the outer adhesive surface 20b of the second double-sided tape 20 is performed so that the rain protection sheet S extends over the entire circumference of the steel pipe 1q. Then, a step of tightening with the tightening belt member 22 is performed from the outside of the rain protection sheet S described above. Thereby, it is possible to more preferably prevent the occurrence of the above-described gap G 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. Note that the water intrusion prevention part structure 10 of the mounting structure AS can be configured without including the second double-sided tape 20, but preferably, it is provided with the second double-sided tape 20 in this way. Also, in the present embodiment, the second double-sided tape 20 is attached over the entire circumference of the steel pipe 1q including the outer surface 18b of the elastic member 18, but it may be attached only to the outside of the outer surface 18b of the elastic member 18, or only to a limited range on the outside of the outer surface 18b and a part of the first double-sided tape 16 on both sides thereof. Thereby, the amount of the second double-sided tape 20 attached to the first double-sided tape 16 can be suppressed, and the second double-sided tape 20 can be effectively utilized.

[0058] In addition, the first double-sided tape 16 has a thickness of 1 mm or more and 3 mm or less. According to this configuration, even in the thickness direction of the first double-sided tape 16, elastic deformation according to the material of the first double-sided tape 20 in the thickness direction becomes possible, and the first double-sided tape 16 can extend 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 or more and 3 mm or less. By also providing this configuration for the second double-sided tape 20, elastic deformation according to the material of the second double-sided tape 20 in the thickness direction becomes possible, and the second double-sided tape 20 can extend and adhere to the surface of the elastic member 18 more flexibly. Note that the first double-sided tape 16 and the second double-sided tape 20 preferably each have a certain degree or more of elasticity in the thickness direction, for example, they may be made of synthetic rubber or natural rubber, and for example, they may be manufactured using acrylic rubber. Thereby, the first double-sided tape 16 and the second double-sided tape 20 can each be more reliably elastically deformed in the thickness direction, and thus, preferably, the formation of the gap G can be more reliably suppressed. However, it is preferable 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. For example, as the first double-sided tape 16 and the second double-sided tape 20, a double-sided tape (thickness 2 mm) manufactured by OTOKU can be used.

[0059] In addition, by providing the rain curing sheet S and performing the welding operation of the seam 2, it is possible to more preferably prevent moisture from reaching the seam 2. Therefore, for example, it is also possible to further reduce the possibility of hydrogen embrittlement occurring in the welded portion.

[0060] As described above, the embodiments and their modifications according to the present disclosure have been described, but the present disclosure is not limited thereto. Various substitutions and changes are possible without departing from the spirit and scope of the present disclosure defined by the claims of the present application.

[0061] The technology according to the present disclosure is also applicable to welding of steel pipes other than press-formed square steel pipes (BCP) for building structures. For example, it can also be used for welding to connect the aforementioned box columns with right-angled corners or cold-rolled formed square steel pipes (BCR), which are a type of steel pipe having a welded portion extending in the longitudinal direction. Fig. 18 shows the framework structure provided therein when a box column 1qa is used as an example for a steel pipe 1q. Fig. 18 is a cross-sectional view corresponding to Fig. 14. As shown in Fig. 18, the box column 1qa has a more right-angled corner and a cross-sectional shape closer to a perfect square compared to the steel pipe 1q of the aforementioned embodiment. Therefore, the box column 1qa is positioned near the corner of the first framework support frame 12 (or the second framework support frame 14). In such a case, the adjustment mechanism 54 (or the adjustment mechanism 72) may be closer to the corner. In Fig. 18, the position of the adjustment mechanism 54 (or the adjustment mechanism 72) is closer to the corner than in the case of Fig. 14. Since the box column 1qa has a substantially rectangular cross-section, a framework support frame (the first framework support frame) 12a having side lengths suitable for its cross-section is used. This is the same for the second framework support frame (not shown) applied to the box column 1qa. The box column 1qa may have a substantially square cross-section. Also, the water intrusion prevention part structure 10 may be applied to the weld build-up 1d of the box column 1qa.

Explanation of Signs

[0062] 1, 1p, 1q, 1qa Steel pipes 1d Weld build-up 2 Joint 10 Water intrusion prevention part structure 12, 12a Framework support frame (the first framework support frame) 14 Framework support frame (the second framework support frame) 16 Double-sided tape (the first double-sided tape) 18 Elastic member 20 Double-sided tape (the second double-sided tape) 22 Tightening belt member 50 Framework structure 52 Band member 54 Adjustment mechanism 56 Hinge mechanism 58 Fastener 60 Support member 70 Band member 72 Adjustment mechanism 74 Hinge mechanism 76 Fastener 78 Spacer member AS Mounting structure S Rainproof sheet

Claims

1. When stacking a second steel pipe on a first steel pipe and welding the joint between the first steel pipe and the second steel pipe, it is an attachment structure of a welding rain protection sheet provided above the joint, a framework support frame provided around the second steel pipe, a support member provided on the framework support frame so as to extend outward from the framework support frame to the outside of the second steel pipe and supporting the rain protection sheet and comprising, the framework support frame a band member wound around the second steel pipe, an adjustment mechanism configured to adjust the tension of the band member around the second steel pipe and comprising, an attachment structure of a welding rain protection sheet.

2. The adjustment mechanism a female screw hole provided in the band member, a male screw member screwed into the female screw hole and provided so as to be able to advance and retreat in the female screw hole and comprising, the male screw member is screwed into the female screw hole so that the tip of the male screw member is pressed against the outer surface of the second steel pipe, The attachment structure of the welding rain protection sheet according to Claim 1.

3. The band member a hinge mechanism, a fastener for fastening both ends of the band member so as to close the band member around the second steel pipe and comprising, The attachment structure of the welding rain protection sheet according to Claim 1.

4. further comprising a second framework support frame provided around the second steel pipe below the framework support frame in the second steel pipe, the second framework support frame comprising a crutch member extending so as to support the support member, The attachment structure of the welding rain protection sheet according to Claim 1.

5. further comprising a spacer member provided between the framework support frame and the second framework support frame, The attachment structure of the welding rain protection sheet according to Claim 4.

6. a first double-sided tape attached so as to adhere to a region including a welded build-up portion where the inner adhesion surface extends in the longitudinal direction of the second steel pipe at a position of the second steel pipe above the framework support frame, an elastic member having a concave shape portion corresponding to the welded build-up of the second steel pipe on an inner surface in contact with the first double-sided tape and having an outer surface extending to the back side of the inner surface, the outer surface having a convex shape smoother than the convex shape of the welded build-up of the second steel pipe, a tightening belt member provided outside the rain protection sheet so that the rain protection sheet extends over the entire circumference of the second steel pipe including the outer surface of the elastic member The mounting structure of the rain protection sheet for welding according to claim 1, comprising

7. A second double-sided tape, wherein an inner adhesive surface of the second double-sided tape is attached to the outer surface of the elastic member, and the rain protection sheet is attached to an outer adhesive surface of the second double-sided tape, further comprising The mounting structure of the rain protection sheet for welding according to claim 6.

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