Joining structure and method between deck plate and support member

Abstract

To provide a structure of junction between a deck plate and a support member which has an excellent workability, can be implemented at a relatively low cost and can easily increase junction bearing force between the deck plate and the support member.SOLUTION: In a junction structure 10A of a deck plate and a support member, a lower surface 2a of a deck plate 2 overlaps on an upper surface 1a of a support member 1 and the deck plate 2 and the support member 1 are joined by weldment, a hole 20 is provided at the deck plate 2 side and a weldment bead B1 is formed and welded so as to overlap with a whole circumference or a part of the hole 20 of the deck plate 2 at an overlapping part of the deck plate 2 and the support member 1.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a joining structure and method for joining a deck plate and a support member. [Background technology]

[0002] Traditionally, deck plates and supporting members have generally been joined using three different joining methods: burn-through plug welding, shot-in rivet welding, and a combination of headed stud welding and spot welding or fillet welding.

[0003] In a joint made by burn-out plug welding, the deck plate is penetrated to make the joint, so it functions as a shear connector between the support member and the composite deck floor plate consisting of the deck plate with concrete poured in it, and also functions to fasten the support member and the deck plate together.

[0004] Even when joining using a projectile rivet, the joint is made by penetrating the deck plate, so it functions as a shear connector between the support member and the composite deck floor plate consisting of a deck plate with concrete poured in it, and also functions to tighten the support member and the deck plate.

[0005] However, joining with projectile rivets is more dangerous than other types of joining because it uses explosives, and the work must be carried out by workers instructed by the rivet manufacturer who has obtained material certification from the Minister of Land, Infrastructure, Transport and Tourism, making it less versatile than joining with burn-out plug welding.

[0006] On the other hand, in joints that combine headed stud joints with spot weld joints or fillet weld joints, when the headed studs are welded through the deck, the effects of backside painting or zinc plating and painting of the flange portion of the support member can be considered, so welding is often done without penetrating the deck.As a result, in joints that combine headed stud joints with spot weld joints or fillet weld joints, the shear connector performance between the support member and the composite deck floor plate consisting of the deck plate on which concrete has been poured is high, but the function of fastening the support member and the deck plate is borne by the spot weld or fillet weld.

[0007] In other words, a joint that combines a headed stud joint with a spot weld joint or a fillet weld joint functions as a shear connector between the support member and the composite deck floor plate consisting of a deck plate with poured concrete, and functions to fasten the support member and the deck plate, and is superior to a joint made by burn-out plug welding or a joint made by a shot-driven rivet.

[0008] However, headed stud and spot or fillet weld joints are more expensive and time-consuming than burn-out plug weld joints and fire-stud joints because they combine two joining methods.

[0009] Therefore, burn-out plug welding is the most widely and generally used method for joining deck plates to supporting members. Furthermore, deck plates are often used as part of composite deck flooring, but because the deck plates themselves have high rigidity and strength, they are also sometimes used for dry roofs, etc. When deck plates are used for the aforementioned dry roofs, burn-out plug welding is also the widely and generally used method for joining deck plates to supporting members.

[0010] Here, joining by burn-out plug welding is a method in which the deck plate base material is melted with a covered arc welding rod while a circular weld metal is piled up on the support member, and the support member and deck plate are joined by the circular weld metal.

[0011] The support members are not limited to H-shaped steel, and various types of shaped steel, such as channel steel and angle steel, can be used as support members. Furthermore, the support members are not limited to beams that form the steel framework of a steel structure, but include beams that form the framework of steel-framed, reinforced concrete, or wooden structures, beams used in dry roofs, and deck plate supports fastened to such beams. Furthermore, deck plate supports are a general term for members that include various types of steel, such as H-shaped steel, channel steel, angle steel, and steel plates.

[0012] Generally, in a joint made by burn-out plug welding, the support member and weld metal are joined over the entire circular cross section, and stress can be borne over that entire surface, whereas the joint strength of the deck plate and weld metal is determined by the joint strength of the outer periphery of the circular cross section where the two meet.

[0013] Furthermore, according to documents showing prior art, such as the Composite Slab Design and Construction Manual, Steel Construction Technical Guidelines - Construction Site Execution Edition, and Deck Plate Slab Notification - Ministry of Land, Infrastructure, Transport and Tourism Notification No. 326 (April 16, 2002), Second Joint, (4), it is stipulated that the excess reinforcement diameter of the burn-out plug weld must be 18 mm or more, but because deck plates are thin, at around 0.8 to 1.6 mm, the joint strength between the deck plate and weld metal is determined primarily by the strength of the deck plate base material around the burn-out plug weld.

[0014] The literature describing the prior art mentioned above states that a safety factor of 3 or more can be ensured for long-term design allowable strength in general design specifications by setting the reinforcement diameter to 18 mm or more, but there is a need to improve the strength per burn-out plug weld to improve design freedom and workability. It would be desirable to increase the circular circumference of the weld metal as much as possible to increase the area where the weld metal and deck plate are joined and increase the joint strength, but this is currently difficult to achieve given the workability of burn-out plug welding.

[0015] Specifically, it is generally believed that a weld diameter of approximately 18 mm or more can be achieved when welding for 10 seconds in a 10-mm circle while maintaining a welding arc length of approximately 3 mm using the "welding rod type," "welding machine," and "standard welding conditions" recommended in the above-mentioned prior art. If the welding rod wears out to a length of 45 to 53 mm, a weld diameter of approximately 18 mm or more can be achieved. However, attempts to increase the weld diameter under the same "welding rod type," "welding machine," and "standard welding conditions" are likely to result in longer welding times and higher welding heat input, potentially leading to welding defects. This is the background to the specification of a weld diameter of 18 mm or more. While it is possible to reduce the likelihood of weld defects by adjusting the welding conditions, this would require the use of unconventional welding rods and welding machines or unusual welding conditions, making it unrealistic from the perspective of workability and cost.

[0016] Furthermore, while deck plates are primarily made of pre-plated materials, when holes are drilled by melting the deck plate with burn-out plug welding, the plating splatters, which can lead to poor melting if not performed carefully. However, with high welding skills, the welding can be performed without error and the required joint strength can be ensured. Patent Document 1 discloses a welding jig that can be easily used by workers with low welding skills to solve this problem.

[0017] Furthermore, it is possible to enlarge the circumference of the circle by forming the burn-out plug weld in a ring or spiral shape, but this is ultimately unrealistic because it is difficult to visually determine whether the deck plate has been burned through before the weld metal is applied. [Prior art documents] [Patent documents]

[0018] [Patent Document 1] Patent Publication No. 2021-159954 Summary of the Invention [Problem to be solved by the invention]

[0019] The present invention was devised in consideration of the above-mentioned problems, and its purpose is to provide a joining structure and method for a deck plate and a support member that is easy to install, can be implemented at relatively low cost, and can easily increase the joint strength between the deck plate and the support member. [Means for solving the problem]

[0020] The joining structure between a deck plate and a support member according to the first invention is a joining structure between a deck plate and a support member in which the lower surface of the deck plate is overlapped on the upper surface of the support member and the deck plate and the support member are joined by welding, characterized in that a hole is provided on the deck plate side and a weld bead is formed at the overlapping portion between the deck plate and the support member so as to overlap the entire circumference or part of the hole.

[0021] The joining structure between a deck plate and a support member according to the second invention is the same as the first invention, and is characterized in that the weld bead has a gap in the center through which the upper surface of the support member is exposed.

[0022] The joining structure between a deck plate and a support member according to the third invention is characterized in that, in the first or second invention, the hole in the deck plate is circular, elliptical, square, or rectangular.

[0023] A fourth aspect of the present invention provides a method for joining a deck plate and a support member, in which the underside of the deck plate is overlapped on the upper surface of a support member and the deck plate and the support member are joined by welding, and is characterized by comprising the steps of: drilling a hole in the deck plate; overlapping the underside of the deck plate on the upper surface of the support member; and welding at the overlapping portion of the deck plate and the support member to form a weld bead having a gap in the center that exposes the upper surface of the support member, so that the weld bead overlaps the entire circumference or part of the hole in the deck plate.

[0024] The fifth invention relates to a method for joining a deck plate and a support member, and is characterized in that, in the fourth invention, the holes in the deck plate are formed after or simultaneously with cutting the deck plate to a predetermined length when constructing the deck.

[0025] The sixth invention relates to a method for joining a deck plate and a support member, and is characterized in that, in the fourth invention, the holes in the deck plate are formed during or after the end-closing processing of the deck plate. [Effects of the Invention]

[0026] According to the joining structures between the deck plate and the support member of the first to third inventions, the diameter of the hole made in the deck plate is larger than that of a joining formed by normal burn-out plug welding, and welding is performed under normal welding conditions using welding rods and a welding machine commonly used in general burn-out plug welding, thereby increasing the stress-bearing surface of the deck plate due to the weld bead joining the deck plate and the beam.This makes it easy to work with and can be implemented at relatively low cost, and it is easy to increase the joining strength between the deck plate and the support member.

[0027] In particular, according to the joining structure between the deck plate and the support member of the second invention, the weld bead has a gap in the center where the upper surface of the support member is exposed, so that no extra weld metal, etc. is used, and the structure can be implemented at lower cost.

[0028] In particular, according to the joining structure between the deck plate and the support member of the third invention, the shape of the holes provided on the deck plate side can be varied to various shapes such as circular, elliptical, square, or rectangular, making it easy to increase the joining strength between the deck plate and the support member.

[0029] According to the methods for joining a deck plate and a support member of the fourth to sixth inventions, a hole is first drilled in the deck plate, the diameter of this hole is made larger than that of a joint made by normal burn-out plug welding, and welding is performed under normal welding conditions using welding rods and a welding machine commonly used in general burn-out plug welding, and the stress-bearing surface of the deck plate due to the weld bead joining the deck plate and the support member can be increased, so the method is easy to work on and can be carried out at relatively low cost, and the joint strength between the deck plate and the beam can be easily increased.

[0030] In particular, according to the method for joining a deck plate and a support member of the fifth invention, the holes in the deck plate are drilled after or simultaneously with cutting the deck plate to the specified length when constructing the deck plate, so the holes can be drilled easily in advance before joining the deck plate and the support member. Furthermore, according to the method for joining a deck plate and a support member of the fifth invention, the holes in the deck plate are drilled in advance, so they can be drilled in advance at a factory or the like rather than on-site, ensuring a sufficient end clearance and preventing insufficient joint strength due to end slippage. Furthermore, the joint spacing in the width direction of the deck plate and the support span in the longitudinal direction of the deck plate can be constructed with high precision as designed.

[0031] In particular, according to the method of joining a deck plate and a support member relating to the sixth invention, the holes in the deck plate are made during or after the end-closing processing of the deck plate, so that the holes in the deck plate can be easily made in advance before the joining work of the deck plate and the support member. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a composite deck floor panel to which a joining structure between a deck plate and a support member according to an embodiment of the present invention is applied. [Figure 2] FIG. 2 is a partially enlarged perspective view showing an enlarged portion of FIG. 1 to which the joining structure between the deck plate and the support member according to the embodiment of the present invention is applied. [Figure 3] FIG. 3(a) is an enlarged plan view showing a main part of a joining structure between a deck plate and a support member according to an embodiment of the present invention, and FIG. 3(b) is a cross-sectional view taken along the line AA in FIG. 3(a). [Figure 4] FIG. 4(a) is an enlarged plan view showing a main part of the joining structure between a deck plate and a beam of a comparative example, and FIG. 4(b) is a cross-sectional view taken along line BB in FIG. 4(a). [Figure 5] FIG. 5 is a partially enlarged view of the deck plate after end-closing. [Figure 6] 6(a) to 6(c) are explanatory diagrams showing an embodiment in which the holes in the deck plate are circular. [Figure 7] 7(a) to 7(d) are explanatory diagrams showing an embodiment in which the holes in the deck plate are elliptical. [Figure 8] 8(a) to 8(c) are explanatory diagrams showing an embodiment in which the holes in the deck plate are square. [Figure 9] 9(a) to 9(d) are explanatory diagrams showing an embodiment in which the holes in the deck plate are rectangular. [Figure 10] Figure 10(a) is an enlarged plan view showing a main part of a joining structure between a deck plate and a support member according to another embodiment of the present invention, and Figure 10(b) is a cross-sectional view taken along the CC line in Figure 10(a). DETAILED DESCRIPTION OF THE INVENTION

[0033] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

[0034] [Embodiment] First, a joining structure between a deck plate and a support member according to an embodiment of the present invention will be described.

[0035] Fig. 1 is a perspective view showing the schematic configuration of a composite deck floor panel to which a joining structure between a deck plate and a support member according to an embodiment of the present invention is applied. Fig. 2 is a partially enlarged perspective view showing an enlarged portion of Fig. 1 to which a joining structure between a deck plate and a support member according to an embodiment of the present invention is applied. Fig. 3(a) is a plan view showing an enlarged main portion of the joining structure between a deck plate and a support member according to an embodiment of the present invention, and Fig. 3(b) is a cross-sectional view taken along line AA in Fig. 3(a).

[0036] As shown in Fig. 1, a joining structure 10A between a deck plate and a support member according to an embodiment of the present invention is used to join a supporting member 1 and a deck plate 2 in a composite deck floor slab 100, which is made of a steel frame, H-shaped steel, and a deck plate 2 with concrete 3 poured on top. Note that in Fig. 1, the concrete 3 is shown partially broken away to make it easier to understand the joining structure 10A between a deck plate and a support member according to this embodiment.

[0037] Specifically, in the joining structure 10A between the deck plate and the support member in this embodiment, as shown in Figure 2, the lower surface 2a of the deck plate 2, which has a corrugated cross section consisting of a series of peaks 21 and valleys 22, is overlapped on the upper surface 1a of the upper flange portion of the support member 1, and the deck plate 2 and the support member 1 are joined by welding.

[0038] More specifically, as shown in Figures 3(a) and 3(b), the joining structure 10A between a deck plate and a support member according to this embodiment has a hole 20 formed in the deck plate 2, and is welded at the overlapping portion of the deck plate 2 and the support member 1 to form a doughnut-shaped weld bead B1 made of weld metal, with a gap G in the center exposing the top surface 1a of the support member 1, so that the weld bead B1 overlaps the entire circumference of the circular hole 20 in the deck plate 2. As shown in Figure 3(b), the top of this doughnut-shaped weld bead B1 rises higher than the top surface of the deck plate 2 around the entire circumference of the hole 20, and the bottom has a generally circular cross section that reaches into the top surface 1a of the support member 1.

[0039] The gap G may be closed with a weld metal or the like.

[0040] Here, the joining structure 10' between the deck plate and the support member using typical burn-out plug welding is configured so that a circular weld bead B2 made of weld metal is formed at the overlapping portion of the deck plate 2 and the support member 1, as shown in Figures 4(a) and 4(b). As shown in Figure 4(b), the entire upper part of this circular weld bead B2 rises higher than the upper surface of the deck plate 2, and the entire lower part, particularly the center, has a cross-sectional shape that is deeper and reaches into the upper surface 1a of the beam 1.

[0041] The joining structure 10A between the deck plate and the support member according to this embodiment is compared with the joining structure 10' between the deck plate and the support member by general burn-out plug welding. Then, (a / 2) 2 π=(c / 2) 2 π-(b / 2) 2 It can be seen that even with the same area of ​​weld metal, the outer diameter of weld bead B1 in deck plate and support member joint structure 10A is larger than the diameter of weld bead B2 in deck plate and support member joint structure 10' using conventional burn-out plug welding, and can therefore withstand greater stress, as π (a is the diameter of weld bead B2 in deck plate and support member joint structure 10', b is the inner diameter of weld bead B1 in deck plate and support member joint structure 10A, and c is the outer diameter of weld bead B1 in deck plate and support member joint structure 10A according to this embodiment) is larger than the diameter of weld bead B2 in deck plate and support member joint structure 10' using conventional burn-out plug welding.

[0042] Next, a method for joining a deck plate and a support member according to an embodiment of the present invention will be described.

[0043] In the method for joining a deck plate and a support member according to this embodiment, first, a hole 20 is drilled in the deck plate 2. Next, the deck plate 2 is placed on the upper surface 1a of the support member 1. Then, using a welding rod and welding machine (not shown) commonly used in typical burn-out plug welding, welding is performed under typical welding conditions at the overlapping portion of the deck plate 2 and support member 1 so that a weld bead B1 is formed that overlaps the entire periphery of the hole 20 in the deck plate 2 and has a gap G in the center where the upper surface 1a of the support member 1 is exposed. This results in a joined structure 10A between a deck plate and a support member as shown in Figures 3(a) and 3(b).

[0044] When forming holes 20 on the deck plate 2 side, although not shown in the figure, the holes 20 can be formed after or at the same time as cutting the deck plate 2 to a specified length when constructing the composite deck floor board 100.

[0045] Furthermore, as shown in Figure 5, when end-closing processing is performed on the deck plate 2 to close the end 21a of the peak 21 of the deck plate 2, the hole 20 should be provided at the bottom of the valley 22 that is continuous with the peak 21 during or after the end-closing processing of the deck plate 2.

[0046] Next, an example of a joining structure 10A between a deck plate and a support member according to this embodiment will be described with reference to FIGS.

[0047] The hole 20 formed in the deck plate 2 is circular, and the weld bead B1 does not necessarily have to be formed so as to overlap the entire circumference of the hole 20 as shown in Figure 6(a), but may be formed so as to overlap part of the hole 20 as shown in Figures 6(b) and 6(c).

[0048] As shown in Figures 7(a) to 7(d), the holes 20 formed in the deck plate 2 are elliptical, and the weld bead B1 does not necessarily have to overlap the entire circumference of the hole 20 as shown in Figures 7(a) and 7(b), but may overlap a portion of the hole 20 as shown in Figures 7(c) and 7(d). Also, as shown in Figures 7(a) and 7(b) and Figures 7(c) and 7(d), the direction of the hole 20 can be such that the long diameter side is the shear direction or the short diameter side is the shear direction, and the hole 20 can be oriented in any direction.

[0049] The hole 20 to be formed in the deck plate 2 is square, and the weld bead B1 does not necessarily have to be formed so as to overlap the entire circumference of the hole 20 as shown in Figure 8(a), but may be formed so as to overlap part of the hole 20 as shown in Figures 8(b) and 8(c).

[0050] As shown in Figures 9(a) to 9(d), the holes 20 formed in the deck plate 2 are rectangular, and the weld bead B1 does not necessarily have to overlap the entire circumference of the hole 20 as shown in Figures 9(a) and 9(b), but may overlap a portion of the hole 20 as shown in Figures 9(c) and 9(d). Furthermore, as shown in Figures 9(a) and 9(b) and Figures 9(c) and 9(d), the direction of the hole 20 can be such that the long side or short side is the shear direction, and the hole 20 can be oriented in any direction.

[0051] Note that the present invention also includes a joining structure 10B between a deck plate and a support member according to another embodiment shown in Figs. 10(a) and 10(b).

[0052] In other words, in the joining structure 10B between the deck plate and the support member according to this embodiment, the work is performed by, for example, a worker with little welding skill, and as shown in Figures 10(a) and 10(b), only a portion of the weld bead B1 made of weld metal overlaps with the hole 20 in the deck plate 2, and the other portion of the weld bead B1 is arranged across the upper surface 1a of the beam 1.

[0053] According to the joining structure 10A between a deck plate and a support member according to the embodiment of the present invention described above, the diameter of the hole 20 on the deck plate 2 is made larger than that of a joint made by ordinary burn-out plug welding, and welding is performed under ordinary welding conditions using welding rods and a welding machine commonly used in ordinary burn-out plug welding, making it possible to increase the stress-bearing surface of the deck plate 2 due to the weld bead B1 joining the deck plate 2 and the support member 1. Therefore, the joining structure 10A between a deck plate and a support member according to this embodiment is easy to install, can be implemented at relatively low cost, and easily makes it possible to increase the joint strength between the deck plate 2 and the support member 1.

[0054] That is, for this reason, according to the joining structure 10A between the deck plate and the support member according to this embodiment, a composite deck floor panel 100 having a large joint strength between the deck plate 2 and the support member 1 can be constructed.

[0055] Furthermore, according to the joining structure 10A between the deck plate and the support member of this embodiment, the shape of the hole 20 provided on the deck plate 2 side can be varied to various shapes such as circular, elliptical, square, or rectangular, making it easy to increase the joining strength between the deck plate 2 and the support member 1.

[0056] According to the method for joining a deck plate and a support member of the present invention, holes 20 are drilled in advance in the deck plate 2, and the diameter of these holes 20 is made larger than that of a typical burn-out plug welding joint. Welding is performed under typical welding conditions using a welding rod and welding machine commonly used in typical burn-out plug welding. This increases the stress-bearing surface of the deck plate 2 due to the weld bead B1 joining the deck plate 2 and the support member 1. Therefore, the method for joining a deck plate and a support member of the present invention is easy to implement, can be carried out at relatively low cost, and easily increases the joint strength between the deck plate 2 and the support member 1. Furthermore, according to the method for joining a deck plate and a support member of the present invention, holes 20 are drilled in the deck plate 2 in advance, allowing them to be drilled in advance in a factory or other facility rather than on-site. This ensures a sufficient end clearance and prevents insufficient joint strength due to end slippage. Furthermore, the joint spacing in the deck plate width direction and the support span in the deck plate longitudinal direction can be precisely constructed as designed.

[0057] Furthermore, according to the method of joining the deck plate and the support member of this embodiment, the holes 20 in the deck plate 2 can be made after or at the same time as cutting the deck plate 2 to a predetermined length when constructing the composite deck floor panel 100, so the holes 20 in the deck plate 2 can be easily made in advance before the joining work of the deck plate 2 and the support member.

[0058] Furthermore, according to the method for joining a deck plate and a support member of this embodiment, the holes 20 in the deck plate 2 can be formed during or after the end-closing processing of the deck plate 2, so in this case too, the holes 20 in the deck plate 2 can be easily formed in advance before the joining work of the deck plate 2 and the support member 1.

[0059] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0060] 100 Composite deck flooring 10A Deck plate and support member joint structure 10B Deck plate and support member joint structure 1 Support member 1a Upper surface of support member 2 deck plates 2a Underside of deck plate 20 holes 21 Yamabe 21a End of mountain 22 Valley 3. Concrete G Gap B1 Weld bead

Claims

1. A joining structure of a deck plate and a support member in which the lower surface of the deck plate is overlapped on the upper surface of the support member, and the deck plate and the support member are joined by welding, A hole is provided on the deck plate side, In the overlapping portion between the deck plate and the support member, a weld bead is formed so as to overlap the entire circumference or a part of the hole. A joint structure between a deck plate and a support member characterized by the above.

2. The weld bead has a gap in the center where the upper surface of the support member is exposed.

2. The joining structure of claim 1, wherein the joining structure comprises a deck plate and a support member.

3. The holes in the deck plate may be circular, oval, square, or rectangular.

3. The joining structure of a deck plate and a support member according to claim 1 or 2.

4. A method for joining a deck plate and a support member, in which the lower surface of the deck plate is placed on the upper surface of the support member, and the deck plate and the support member are joined by welding, a step of providing a hole in the deck plate; a step of overlapping a lower surface of the deck plate with an upper surface of the support member; and a step of welding the deck plate and the support member at the overlapping portion so as to form a weld bead having a gap in the center exposing the upper surface of the support member so as to overlap the entire periphery or a part of the hole in the deck plate. A method for joining a deck plate and a support member, characterized by the above.

5. The holes in the deck plate are provided after or at the same time as cutting the deck plate to a predetermined length when constructing the deck.

5. The method for joining a deck plate and a support member according to claim 4,

6. The holes in the deck plate shall be provided during or after the end-closing process of the deck plate.

5. The method for joining a deck plate and a support member according to claim 4,

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