JP3157509U - Deck with truss - Google Patents

Abstract

There is provided a deck with a truss having an end support member which can maintain good welding quality and can be easily welded with less mounting effort. A plurality of trusses 1 including one upper chord reinforcing bar 2 and two lower chord reinforcing bars 3 and 3 'arranged in parallel in a front triangular shape, and lattice reinforcing bars 4 and 4' welded to the upper chord reinforcing bar and the lower chord reinforcing bar. The decks 13 with trusses are provided with end support members 16 provided at both ends of the truss 1. The end support member 16 is formed by forming a plurality of V-shaped bent portions in a reinforcing bar in accordance with the arrangement interval of the truss, and the V-shaped top portion of the end support member is located on the inner side of the truss than the lower portion. In such a state that the V-shaped top part straddles the upper chord reinforcing bar, the inner side of the V-shaped top part is welded to the upper surface of the upper chord reinforcing bar, and the inner side surface of the end support member is welded to the outer side surface of the lower chord reinforcing bar. Then, both end portions of the end portion supporting member and an intermediate portion of the adjacent V-shaped bent portion 17 are welded to the bottom plate 12, respectively. [Selection] Figure 1

Description

The present invention relates to a deck with a rebar truss, that is, a floor slab structural material in which a rebar and a discarded form frame are integrated, particularly to an end structure of a deck with a rebar truss.
A deck with a rebar truss (hereinafter simply referred to as a “deck with a truss”) is manufactured and delivered according to the floor specifications of the building, so it is easy to lay and fix the field work. The deck with truss, which can be used as a part of the structure, also serves as a formwork, and in principle does not use temporary materials such as support, shortening the work period, reducing on-site arrangement work, making formwork and support unnecessary, etc. Widely used because of its effect.

  As a deck with a truss, one upper chord reinforcing bar and two lower chord reinforcing bars are arranged in parallel in a front triangular shape, and two latticed bars bent in a wave shape are welded to the upper chord reinforcing bar at the upper bent part, A plurality of trusses welded to the outside of the lower chord rebar are welded to the bottom plate at the lower end of the lattice rebar, and end support members are provided at both ends. Things are known. The end support member is a member for directly supporting the truss by the cross beam when the truss deck with the truss is laid over the cross beam and the end of the deck with the truss is placed on the cross beam in the field construction.

  As this end support member, a cross-shaped end support member as shown in FIGS. 13 and 14 in which an upper chord reinforcing bar and a lower chord reinforcing bar are connected and fixed at the end of the truss with a reinforcing bar is conventionally used. 13 and 14, the ends of the upper chord reinforcing bar 2 and the two lower chord reinforcing bars 3, 3 ′ are projected so that the horizontal tip 31 of the L-shaped vertical reinforcing bar 30 faces the outside of the truss. Is welded to the lower surface of the end portion 38 of the upper chord reinforcing bar 2 so that the bent horizontal portion 31 of the L-shaped vertical reinforcing bar is in contact with the upper surface of the bottom plate 12. The horizontal rebar 33 is placed on both projecting portions 34 of the lower chord reinforcing bars 3 and 3 ′ and applied to the L-shaped vertical rebar 30, so that both ends 35 and 35 of the horizontal rebar and the lower chord reinforcing bar ends 34 and 34 are connected. The end support member is formed by welding and welding the horizontal reinforcing bar 33 and the L-shaped vertical reinforcing bar 30 at the crossing portion 36 thereof. In the figure, 4 and 4 'indicate two lattice reinforcing bars bent in a wave shape.

  The method of supporting the deck with truss on the cross beam depends on whether the cross beam is a steel frame (S structure) or a reinforced reinforced concrete (RC structure). When the cross beam is a steel frame (S structure), it is performed by welding the bent horizontal front end portion of the L-shaped vertical rebar together with the bottom plate to the steel cross beam. When the horizontal beam is made of reinforced reinforced concrete (RC structure), the L-shaped vertical reinforcing bar is bent downward and the tip is bent downward, and the L-shaped vertical reinforcing bar is placed outside the reinforced reinforced concrete form of the horizontal beam. The lower bent portion is hooked and engaged, and the bottom plate of the deck with truss is fixed by nailing to the pier of the formwork.

  As described above, the work process for welding the conventional cross-shaped end support member to the deck with a truss is complicated and is performed manually. However, it is desired to perform this work process with an automatic welding machine. If the end support member is welded in advance to the crossing point of the L-shaped vertical rebar and horizontal rebar, and automatic welding is attempted using this, the position of the upper chord, lower chord and bottom plate The relationship, particularly the height of the upper chord rebar, is small, but an allowable dimensional error occurs, so that the quality of the welding cannot be maintained, and a portion that cannot be welded or a welding failure occurs. Therefore, in order to fix the cruciform end support member to the deck with truss, the welding operation process must be performed manually, and it is difficult to automatically weld the machine.

  As an alternative to the cross-shaped end support member described above, in Patent Document 1, a reinforcing bar is bent into a V shape, and both ends are bent in a direction perpendicular to the surface including the V-shaped reinforcing bar to form a lower end portion. An end support member has been proposed in which the top of the V-shape is butted against the lower surface of the upper chord rebar and the outer surface of the support member is welded to the inner surface of the lower chord rebar.

Further, Patent Document 2 has a frame shape with an opening at the bottom and an upper frame portion parallel to the bottom plate, and a side frame portion extending downward, and the upper frame portion is fixed to the upper chord reinforcing bar, and the side frame portion. An end support member is proposed in which the end support member is fixed to the lower chord reinforcing bar, and the end support member can be provided so that the upper side is inclined inward. It is also described that a horizontal part and a vertical part may be provided in the lower part of the support member.
JP 2003-193608 A JP 2003-160988 A

  However, in the invention described in Patent Document 1, since the end support member is provided so as to be fitted inside the truss composed of the upper chord reinforcing bar, the lower chord reinforcing bar, and the lattice reinforcing bar, the end supporting member is set at the predetermined position. Therefore, complicated operations are required for welding, and it is difficult to perform automatic welding while maintaining the quality of welding. In particular, it is difficult to automatically set and weld the end support member after welding the truss to the bottom plate. In addition, the deck with truss has a plurality of trusses, and it is necessary to attach an end support member to each truss, which is troublesome.

  In the invention described in Patent Document 2, (1) since the length of the upper frame portion of the end support member is larger than the diameter of the upper chord reinforcing bar, it is difficult to perform positioning when setting the end support member. (2) When the end support member is provided with an inclination, the horizontal part formed at the lower part of the end support member, or the horizontal part and the vertical part are the ends of the end support member. Since it shifts from the horizontal and vertical respectively with the inclination, it is difficult to weld the end support member to the cross beam steel frame or to engage with the cross beam RC formwork when performing on-site construction. Become. (3) In addition, the deck with truss has a plurality of trusses, and it is necessary to attach an end support member for each truss, which is troublesome.

  The problem with the present invention is that it does not require manual welding work, can maintain good welding quality even if the dimensions of the truss have tolerances, and supports end parts that require less labor and are easy to perform automatic welding. It is to provide a trussed deck having members.

  That is, in the present invention, one upper chord reinforcing bar and two lower chord reinforcing bars are arranged in parallel in a front triangular shape, and two lattice rebars bent in a wave shape are welded to the upper chord reinforcing bar at each upper bent portion, A plurality of trusses formed by welding the outer side close to the lower part of the lattice rebar to the inner side of the lower chord bar are juxtaposed and welded to the bottom plate at the lower end of the lattice rebar, and end support members are provided at both ends of each truss. In the deck plate with a truss provided, the end support member is formed by forming a plurality of V-shaped bent portions in a reinforcing bar in accordance with the arrangement interval of the truss, and the end support member is the V-shaped end member. In a state where the top portion is inclined so as to be located inside the truss from the lower portion, the V-shaped top portion of the end support member is welded to the upper surface of the upper chord rebar so that the V-shaped top portion straddles the upper chord rebar, The inner surface of the end support member Welded to the outer surface of the string reinforcing bars, and a truss deck plate, characterized in that the intermediate portion of the bent portion of the end portions and the adjacent V-shaped end support member to the bottom plate are welded respectively.

In the present invention, the following are preferably used as the upper chord reinforcing bar, the lower chord reinforcing bar, the lattice reinforcing bar, the bottom plate, and the end support member.
Upper string rebar-Steel bar for reinforced concrete (JIS G 3112) diameter is 10-16mm
Lower string rebar-Steel bar for reinforced concrete (JIS G 3112) 5-13mm in diameter
Lattice rebar--Standard iron wire (JIS G 3532) diameter 4-8mm
Bottom plate--galvanized steel sheet (JIS G 3302) thickness 0.4-0.5mm
End support member-Ordinary iron wire (JIS G 3532) Diameter 5-10mm

  According to the present invention, since the end support member can be inclined and welded to the truss, even if there is an allowable dimensional error in the height of the upper chord reinforcing bar, it is possible to maintain the welding quality without causing defective welding. Can be automated and thus easy to weld. In addition, since the end support member uses a single integrated member for a plurality of trusses, it is possible to simplify the work process, reduce costs by automating welding, and automate welding. Therefore, efficiency can be improved by tact-up.

The embodiment of the present invention will be specifically described below with reference to examples.
The truss is composed of upper chord, lower chord, and lattice rebar. 1-3, one upper chord reinforcing bar 2 and two lower chord reinforcing bars 3 and 3 'are parallel to each other, and when viewed from the front (FIG. 3), the upper chord is formed at the apex forming the apex angle of the isosceles triangle. Reinforcing bars 2 are positioned and arranged in a triangular shape so that each of the two lower chord reinforcing bars 3, 3 'is positioned at two vertices forming the base angle of an isosceles triangle. One of the two lattice rebars 4 and 4 ′ bent in a wave shape is an upper bent portion 5, which is welded and fixed to the left side 6 of the upper chord rebar as shown in FIGS. The outer side 7 close to is welded to the inner side of one lower chord bar 3. Similarly, the other lattice rebar 4 ′ is welded and fixed to the right side 9 of the upper chord rebar 2 at its upper bent portion 8, and is welded and fixed to the inside of the other lower chord rebar 4 ′ at the outer side 10 near the lower part of the lattice rebar. Is done. The lower bent portions 11 and 11 'of the lattice reinforcing bars 4 and 4' are bent in the horizontal direction at the lower ends thereof outward.

  In this way, a plurality of trusses 1 (two in the figure) composed of the upper chord reinforcing bar 2, the lower chord reinforcing bar 3, 3 ', and the lattice reinforcing bar 4, 4' are arranged in parallel in the horizontal direction which is the lower end of the lattice reinforcing bar 4, 4 '. The bent lower bent portions 11 and 11 ′ are welded to the bottom plate 12 to constitute a deck plate 13 with a truss. As an example of the material of the deck plate with the truss, a steel bar for reinforced concrete having a diameter of 13 mm (JIS G 3112) is used as the upper chord rebar, and a bar for steel reinforced concrete (JIS G 3112) having a diameter of 6 mm is used as the lower chord rebar. In this case, an ordinary iron wire (JIS G 3532) having a diameter of 4 mm is used, and an ordinary iron wire (JIS G 3532) having a diameter of 7 mm is used as the end support member. Taking the dimensions of a deck plate with a truss as an example, the truss height is 130 mm, the lower chord reinforcing bar height is 30 mm, the distance between the two lower chord reinforcing bars is 70 mm, and the pitch of the wavy bending of the lattice reinforcing bar is 200 mm, The space between the trusses is 200 mm, and the length and width of the bottom plate are 1000 cm and width 40 cm, respectively.

  Each of the edge portions 14 of the bottom plate 12 has connecting portions 15 and 15 'bent upward or downward, and when a plurality of deck plates with trusses are arranged, adjacent bottom plate connecting portions 15 and 15' are fitted to each other. Combined and connected.

  End support members are provided at both ends of the plurality of trusses of the deck plate with truss. The end support member has the reinforcing bars formed with a plurality of V-shaped bent portions in accordance with the arrangement interval of the trusses so as to straddle the ends of the plurality of adjacent trusses. When two trusses are provided on a deck plate with one truss, an end support member having an inverted W-shaped bent portion is used, and three trusses are provided on a deck plate with one truss. One end support member having three inverted V-shaped bent portions is used at each end of the deck plate. It is preferable to provide 2 to 3 trusses on one truss deck plate in order to maintain the welding quality and facilitate welding automation. It is more preferable to provide a truss.

  When one trussed deck plate has four or more trusses, for example, 5 to 8 trusses, the end support members provided at each end thereof are the inverse of four or more equal to the number of trusses. An integral end support member having a V-shaped bend may be provided, but it may be better to provide separate end support members having two or three inverted V-shaped bends to maintain welding quality. Often preferred to avoid complication of automatic welders.

  Hereinafter, a case where two trusses are provided will be described. As shown in FIGS. 1-4, the edge part supporting member 16 is provided in each of the both ends of the two trusses of the deck plate 13 with a truss. The end support member 16 has two V-shaped bent portions 17 formed on the reinforcing bar in accordance with the arrangement interval of the truss so as to straddle the ends of two adjacent trusses, and has an inverted W-shape. Have

  As shown in FIGS. 4 to 6, the height L of the end support member 16 expressed by the distance from the lower portion of the end support member 16 to the inside of the bent portion top is the height of the truss (from the upper surface of the bottom plate 12 to the upper chord rebar 2. 2 to 5 mm higher than h). In FIG. 6, the points where imaginary lines (dotted lines) 20 and 20 ′ that contact the side surface of the upper chord rebar 2 and the outer surface of the lower chord rebar 3 and 3 ′ intersect with the bottom plate 12 are 21, 21 ′, 22, and 22 ′. The distance between 21 and 21 'and the distance between adjacent trusses 21' and 22 are denoted by d2 and t2, respectively. The width d1 of the V-shaped bent portion of the end support member 16 of FIG. 5 matches with d2 of FIG. 6, and the length t1 of the flat portion at the center of the end support member 16 of FIG. 5 matches t2 of FIG. Then, the end support member 16 is manufactured so that the length e of each horizontal end 19 of the end support member 16 of FIG. 5 is 2 to 4 cm. The radius of curvature r inside the V-shaped bent portion top 17 of the end support member is made substantially equal to the radius of the upper chord reinforcing bar 2. However, when the end support member is set on the truss, the contact between the top 17 of the V-shaped bent portion of the end support member and the upper chord rebar is obstructed by the upper bent portion of the lattice bar welded to the upper chord rebar. In order to avoid this, it is preferable to make the radius of curvature r inside the V-shaped bent portion top portion 17 of the end support member slightly larger than the above value. Further, when the width of the truss shown in FIGS. 6 and 2 (distance between the lower ends of the pair of lattice rebars) a is larger than d2, it may be difficult to set the lower portion of the end support member 16 on the bottom plate. In this case, the problem can be solved by changing the pitch of the wavy bend of the lattice rebar in advance so that the lower part of the lattice rebar is not located at the end of the truss. Alternatively, there is no problem if the dimensions of the lattice rebar are designed so that a is smaller than d2.

  After setting the end support member so that the V-shaped bent portion top portion 17 straddles the upper chord reinforcing bar and the lower portion of the end support member 16 at a predetermined position, the upper portion of the end support member is placed inside the truss. By inclining toward the top, the inner side of the bent portion top 17 of the end support member 16 is brought into contact with the upper surface of the upper chord rebar 2, and in this state, the V-shaped inner top of the end support member and the upper surface of the upper chord rebar 2 are brought into contact with each other. Weld and fix. Since the two trusses 1 and 1 are of the same production lot or manufactured in succession, their heights from the bottom plate of the upper chord rebar are approximately equal, so the inclination of the end support member described above Thus, the inner sides of the two bent portion top portions 17 and 17 of the end support member 16 can be brought into contact with the upper surfaces of the upper chord reinforcing bars 2 and 2, respectively. The inner side surface of the end support member is welded and fixed to the outer surface of the lower chord reinforcing bars 3 and 3 ', and both end portions 19 of the end support member and both ends 18 of the intermediate portion of the adjacent V-shaped bent portion, 18 is fixed to the bottom plate 12 by welding. These welding fixations are performed by spot welding.

  As a result, the end support member 16 is inclined from the vertical plane toward the center of the predetermined angle truss as shown in FIG. This inclination angle α depends on the fluctuation value within the tolerance range of the truss height. When the truss height is high, the inclination angle becomes small, and when the truss height is low, the inclination angle becomes small. growing. If the inclination angle α is too small, it becomes difficult to bring the top of the end support member into contact with the upper chord rebar or the bottom of the end support member into contact with the bottom plate due to fluctuations in the height of the truss. On the other hand, if the inclination angle α is too large, the end support function of the end support member tends to deteriorate. Therefore, the height L of the end support member 16 is preferably 2 to 5 mm higher than the height h of the truss so that the inclination angle α is 5 to 45 degrees. A more preferable inclination angle α is 10 to 45 degrees. By tilting the end support member in this manner, even if the truss height fluctuates within the allowable error range, the V-shaped top of the end support member can be brought into close contact with the upper chord reinforcing bar, resulting in poor welding. It is possible to perform automatic welding while maintaining good welding quality without causing any problems.

  As shown in FIG. 7, after the deck plate 13 with truss is laid over the steel cross beam 24, the lower center 23 (FIG. 2, 3) of the inverted W-shaped end support member is welded to the cross beam 24 together with the bottom plate 12. To fix. If the welding length between the end support member and the cross beam is short, poor welding is likely to occur. However, in the present invention, regardless of the value of the inclination angle of the end support member, the position of the lower center 23 of the end support member is always constant and does not float above the bottom plate, and the end support member and the cross beam Therefore, the welding operation can be easily performed without fear of welding failure.

When the cross beam is made of reinforced reinforced concrete (RC structure), as shown in FIGS. 8 and 9, L-shaped members 25 obtained by bending iron wires into an L shape are used at both ends of the bottom plate of the deck plate with trusses, more preferably truss. Weld to the position directly below the end of each upper rebar. As the iron wire of the L-shaped member, a normal iron wire (JIS G 3532) having a diameter of 5 to 10 mm, for example, a diameter of 7 mm is used. Moreover, it can replace with this iron wire, and what bent the iron plate cut | disconnected in the strip shape of thickness 1-3mm and width 10-20mm can also be used as an L-shaped member.
As shown in FIG. 10, the deck plate with the truss is bridged over the cross beam, and the tip bent downward of the L-shaped member is engaged with the outer iron plate 27 of the reinforced reinforced concrete form 26 of the cross beam. The deck plate is prevented from slipping, and a nail is struck through the bottom plate to the wooden crosspiece 28 of the mold to fix the bottom plate to the crosspiece.

The above description has been given for the case of a deck plate having two trusses. However, in the case of a deck plate having three trusses, the end support member 39 having three inverted V-shaped bent portions is shown in FIGS. Install as in the case of two trusses as shown.

The perspective view which shows the Example of this invention (center part omitted) Partial plan view showing an embodiment of the present invention Front view showing an embodiment of the present invention Side view showing an embodiment of the present invention (showing one end of a deck plate) The front view which shows the edge part supporting member of the Example of this invention The front view which shows the dimensional relationship of the Example of this invention Side view showing a construction example of the embodiment of the present invention (showing one end of the deck plate) The perspective view which shows the other Example of this invention (The one end part of a deck plate is shown) Front view showing another embodiment of the present invention Side view showing a construction example of another embodiment of the present invention (showing one end of the deck plate) The front view which shows the edge part supporting member of the other Example of this invention. Front view showing another embodiment of the present invention Front view showing conventional technology Side view showing conventional technology

1. · Truss 2 · · Upper chord rebar 3, 3 '· Lower chord rebar 4, · Lattice rebar 5 · · Lattice rebar upper bent portion 12 · Bottom plate 13 · Truss deck plate 14 · · Bottom plate Both edges 15, 15 '.. Bottom plate connecting portion 16..End support member 17..End support member V-shaped bent portion 18..Both ends 19 of the intermediate portion of the V-shaped bent portion..End support Both ends 25 of the member ·· L-shaped member

Claims (4)

  One upper chord reinforcing bar and two lower chord reinforcing bars are arranged in parallel in a front triangular shape, and two latticed bars bent in a wave shape are welded to the upper chord reinforcing bar at the upper bent part, respectively. With trusses formed by welding a plurality of trusses that are welded close to the inside of the lower chord reinforcing bar in parallel and welding to the bottom plate at the lower end of the lattice reinforcing bar, and providing end support members at both ends of each truss In the deck plate, the end support member is formed by forming a plurality of V-shaped bent portions in a reinforcing bar in accordance with the arrangement interval of the truss, and the V-shaped top portion of the end support member is lower than the lower portion. In a state of being inclined so as to be located inside the truss, the bottom surface of the V-shaped top of the end support member is welded to the top surface of the top chord rebar so that the V-shaped top of the end support member straddles the top chord rebar. The inner surface is the outer surface of the lower chord reinforcing bar Contact, and truss deck plate, characterized in that the intermediate portion of the bent portion of the end portions and the adjacent V-shaped end support member to the bottom plate are welded respectively. The deck plate with a truss according to claim 1, wherein the two trusses are welded to a bottom plate, and the end support member has an inverted W shape. The deck plate with a truss according to claim 1 or 2, wherein the end support member is inclined by 5 to 45 degrees from a vertical plane. The deck plate with a truss according to any one of claims 1 to 3, wherein an L-shaped member to be engaged with the cross beam is welded to both ends of the bottom plate.

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