JP2006226022A - Deck plate with truss and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the upper and lower surfaces 4 and 5 of a deck plate 1 from being affected by such an application as the occurrence of welding stripe pattern. <P>SOLUTION: A connection reinforcement 20 formed by connecting trusses 15 and 15 to each other is disposed on the deck plate 1 having joining ribs 7 and 7 on the upper surface thereof. The flat parts 21 and 22 of the connection reinforcement 20 are put on the joining ribs 7 and 7. Next, upper and lower electrodes 26 and 27 are disposed so as to hold the joining ribs 7 and 7 and a voltage is applied thereto while pressing the connection reinforcement 20 by the upper electrode 26. The joining ribs 7 are molten by the application of the voltage and a recessed parts 8 are formed in the joining ribs 7. The connection reinforcement is fixedly welded in a fitted state to the recessed part to form the deck plate 30 with the truss (a). A clearance with a distance Ho is formed between the lower edge 9 of the recessed part 8 and the upper surface 4 of the deck plate 1 (c) (e). The upper and lower electrodes 26 and 27 are not brought into contact with the deck plate 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a steel plate structure, a concrete structure, a deck plate used when a floor is formed of concrete, and a deck plate with a truss for preventing welding stripes from being formed on the surface of the deck plate. And a method of manufacturing the deck plate with the truss.

  In order to construct a concrete floor with a reinforced concrete structure, a steel structure, a steel reinforced concrete structure, etc., a deck plate was used as a formwork as a formwork.

  In this case, in order to increase the length and width of the deck plate, a truss was fixed to the upper surface of the deck plate by welding. Accordingly, truss weld stripes remained on the lower surface of the deck plate. When the deck plate is used as it is as a simple finishing material for the lower surface (ceiling surface) of the slab, welding stripes are formed on the base plate, making it difficult to see the appearance of the lower surface of the base plate.

  After the slab is formed, in order to process the welding stripes, the bottom surface of the base plate is painted, or various finishing materials are applied such as sticking sheets and boards, or the ceiling material is stretched, and the bottom surface of the base plate Had to cover up. Therefore, it takes time to finish the deck plate after placing concrete on the construction site and increases the cost of temporary work for ceiling work.

In order to solve such a problem, the applicant proposed a method of forming a protrusion on the deck plate and welding the protrusion and the rib to solve the above problem (Patent Document 1).
JP-A-8-151718

  However, in the technique of Patent Document 1, it is necessary to perform welding work on the upper surface side of the deck plate, and there is a problem that it cannot be applied to a welding apparatus in which electrodes are arranged on the upper surface side and the lower surface side of the deck plate.

  However, the present invention solves the above-mentioned problems because the truss member is fixed to the recess formed by welding while pressing a part of the truss member to the connecting rib formed on the upper surface of the deck plate.

That is, this invention is a deck plate with a truss formed by welding and fixing the lower end of the truss to the upper surface side of the deck plate, and is a deck plate with a truss characterized by the following.
(1) A coupling rib was formed on the top surface of the deck plate.
(2) A truss member or a truss member made of an auxiliary material for the truss was fixed by welding in a recessed portion formed in the coupling rib.
(3) A gap was formed between the lower edge of the recessed portion and the upper surface of the deck plate.

  Another invention is a method for manufacturing a deck plate with a truss, which is manufactured by the following procedure.

(1) The deck plate has a connecting rib on the upper surface.
(2) A truss member made of a truss or a truss auxiliary material is placed on the deck plate.
(3) An upper electrode and a lower electrode are disposed on the upper surface side and the lower surface side of the deck plate with the coupling rib interposed therebetween.
(4) While pressing the truss member against the coupling rib with the upper electrode, energizing both electrodes to melt the coupling rib to form a recessed portion, and position the truss member in the recessed portion In this state, the truss member and the deck plate are fixed by welding.
(5) A gap is formed between the lower edge of the recessed portion and the upper surface of the deck plate.

  The truss member in the above refers to a truss or a truss auxiliary material. In the above-mentioned truss, both a flat truss and a solid truss are included in the truss, and a structure in which a plurality of parallel trusses are connected by connecting reinforcing bars is also included in the truss. Further, the truss auxiliary material mentioned above refers to a truss suspension member connecting a plurality of trusses, a member protruding from the main structure of the truss, etc. The structure is arbitrary as long as the truss can be fixed to the coupling rib.

  Since the truss member made of truss or truss auxiliary material is pressed and welded to the coupling rib of the deck plate, a concave portion is formed by melting the coupling rib, and the truss member is inserted into the concave portion. Fixed by welding. Therefore, the truss is firmly fixed to the deck plate, and even when an excessive external force is applied to the truss, there is no possibility that the welding will come off. Moreover, there exists an effect which can simplify a welding operation.

  In addition, since a gap was formed between the lower edge of the recessed part and the upper surface of the deck plate, when welding was performed using a general-purpose welding device using electrodes arranged on the upper and lower surfaces of the deck plate Even if it exists, since it does not push in until the upper and lower electrodes are completely in contact with the deck plate, no welding stripes are formed on the lower surface of the deck plate. Therefore, the lower surface of the deck plate can be used while maintaining the state of the material.

  Furthermore, since it can be applied to a general-purpose welding apparatus, there is an effect that a deck plate with a truss that does not generate weld stripes can be efficiently manufactured by automatic welding.

(1) The deck plate 1 is formed with connecting edges 2 and 3 that can be engaged and connected to each other, and lengthwise connecting ribs 7 and 7 are formed in accordance with the grounding position of the truss 15 to be used. . The truss 15 is configured by arranging wave-shaped reinforcing bars (lattice materials) 19 obliquely on main reinforcing bars 16, 17, 17 arranged in a triangular shape and welding them at each contact point. The two trusses 15 and 15 are welded onto the truss fixing portions 23 and 23 of the connecting reinforcing bars 20 and 20 so as to be integrally connected.

(2) The connecting reinforcing bars 20 to which the trusses 15 and 15 are attached are arranged on the upper surface 4 of the deck plate 1, and the flat portions 21 and 22 of the connecting reinforcing bars 20 are positioned on the connecting ribs 7 and 7 (FIG. 1A). (B) (d)). Subsequently, sandwiching the coupling ribs 7 and 7 of the deck plate 1, the upper electrode 26 is disposed on the upper surface 4 side, the lower electrode 27 is disposed on the lower surface 5 side (FIG. 1B), and the upper electrode 26 is disposed below (FIG. 1). (B) Applied to the upper and lower electrodes 26, 27 while pressing in the direction indicated by arrow 32). By application, the relatively soft coupling ribs 7 and 7 are melted to form the recessed portion 8 in accordance with the cross-sectional shape of the connecting rebar 20. The connecting reinforcing bar 20 is welded and fixed in a state of being fitted into the recessed portion 8. The deck plate 30 with truss is configured as described above (FIGS. 1A and 2).
(3) At this time, a gap (H ₀ = 2 to 3 mm) having a distance H ₀ is formed between the lower edge 9 of the recessed portion 8 and the upper surface 4 of the deck plate 1 (FIG. 1C). e)) The influence of the application such as generation of welding stripes on the upper and lower surfaces 4 and 5 of the deck plate 1 does not occur.

  An embodiment of the present invention will be described with reference to FIGS.

(1) The deck plate 1 is formed with connecting edges 2 and 3 so that both edges along the length direction can be raised and engaged with each other. In addition, coupling ribs 7 and 7 in the length direction are formed at both ends and the center of the deck plate 1 in accordance with the grounding position of the truss 15 to be used.

(2) The truss 15 is arranged in a triangular shape in the length direction of the deck plate 1 such that the two main reinforcing bars 17 and 17 form the bottom with one main reinforcing bar 16 as the apex. The corrugated reinforcing bar (lattice material) 19 is arranged diagonally so that the main reinforcing bar 16 and one main reinforcing bar 17 and the main reinforcing bar 16 and the other main reinforcing bar 17 are connected to each other. The upper end 19a of the corrugated reinforcing bar 19 and the main rebar 16 are welded and fixed to the lower end 19b of the corrugated reinforcing bar 19 and the main reinforcing bar 17, respectively.

  The reinforcing bars are bent to form convex truss fixing parts 23, 23 between the flat parts 21, 21 at both ends, thereby constituting a connecting reinforcing bar (truss auxiliary material) 20. An intermediate portion between the truss fixing portions 23 and 23 is a flat portion 22. The truss 15 is arranged on the truss fixing part 23 of the connecting reinforcing bar 20 with the main reinforcing bars 17, 17 facing down, and the main reinforcing bars 17, 17 are fixed on the upper horizontal member 24 of the truss fixing parts 23, 23.

(3) The connecting reinforcing bar 20 to which the truss 15 is attached is disposed on the upper surface 4 of the deck plate 1. At this time, the flat portions 21 and 22 of the connecting reinforcing bars 20 are placed on the connecting ribs 7 and 7 (FIGS. 1A, 1B, and 1D).

(4) Subsequently, the coupling ribs 7 and 7 of the deck plate 1 are sandwiched, and the upper electrode 26 is disposed on the upper surface 4 side of the deck plate 1 and the lower electrode 27 is disposed on the lower surface side (FIG. 1B). If applied to the upper and lower electrodes 26 and 27 while pressing the upper electrode 26 downward (in the direction of arrow 32 in FIG. 1 (b)), the connecting ribs 7 and 7 thinner than the connecting reinforcing bars 20 melt, and the connecting reinforcing bars In accordance with the cross-sectional shape of 20, a semicircular recess 8 is formed by a melting allowance. The connecting rebar 20 is welded and fixed in a state of being fitted into the recessed portion 8, and the deck plate 1 and the connecting rebar 20 with the truss 15 are fixed integrally.

At this time, a gap with a distance H ₀ (about H ₀ = 2 to 3 mm) is formed between the lower edge 9 of the recessed portion 8 and the upper surface 4 of the deck plate 1 (FIGS. 1C and 1E). Therefore, since the upper and lower electrodes 26 and 27 do not contact the upper and lower surfaces 4 and 5 of the deck plate 1, there is no influence of application such as generation of welding stripes on the upper and lower surfaces 4 and 5 of the deck plate 1.

(5) The deck plate 30 with truss is configured as described above (FIGS. 1A and 2).

In the above description, when the connecting reinforcing bar 20 having a diameter d ₀ (= about 5 mm) is used, the height H of the connecting rib 7 is formed to be about 7 mm.

  In addition, the deck plate 30 with truss is connected with the connecting edges 2 and 3 in the width direction as in the case of the conventional deck plate. And used as a molding form for a concrete slab (not shown). At this time, since no weld stripes are generated on the lower surface 5 of the deck plate 1, the lower surface 5 of the deck plate 1 can be used as it is as a finished surface of the ceiling without any weld stripe scars.

(6) In another embodiment the embodiment, as half of the outer diameter d ₀ of the connecting reinforcement 20 is filled, has formed the recessed portion 8 to press the upper electrode 26 in a semi-circular, at least the gap H ₀ If about 2 mm can be secured, it can be pressed strongly (to the extent that the entire cross section of the connecting reinforcing bar 20 is accommodated in the recessed portion 8), or can be pressed weakly (not shown). In this case, if the connecting reinforcing bars 20 are accommodated deeper, the connecting reinforcing bars 20 and the connecting ribs 7 are more strongly connected and fixed, and there is no possibility that welding will be disconnected during transporting or construction of the deck plate 30 with truss.

  Moreover, in the said Example, the shape of the truss 15 is arbitrary (not shown).

  Moreover, in the said Example, if the joint rib 7 is formed, the shape of the deck plate 1 is also arbitrary (not shown).

  Moreover, in the said Example, although the connection rib 7 was formed along the length direction of the deck plate 1, if it can form the recessed part 8 when welding with a part of truss 15 (connection rebar 20), a connection rib The direction of 8 is arbitrary (not shown). Usually, it is desirable to form in the length direction of the deck plate 1 in order to use both “the rib for reinforcing the deck plate” and “the rib for forming the truss welding notch”.

  Moreover, in the said Example, although the main reinforcing bars 17 and 17 were adhere | attached on the upper horizontal member 24 of the truss fixing | fixed parts 23 and 23 of the connection reinforcing bar 20, if the truss 15 and the connection reinforcing bar 20 are fixed, connection reinforcing bar will be carried out. The fixed position of 20 is arbitrary. For example, the upper horizontal member 24 of the connecting reinforcing bar 20 can be disposed so as to be positioned on the lower surface of the main reinforcing bars 17 and 17 (FIGS. 6A and 6B). In this case, the welding of the upper horizontal member 24 of the connecting reinforcing bar 20 and the main reinforcing bars 17 and 17 of the truss can be omitted. In this case, a jig (a steel material or a block having a predetermined height) is interposed between the upper surface of the deck plate 1 and the main reinforcing bar 17 of the truss 15 so that the relative position between the truss 15 and the deck plate 1 is maintained. (Not shown).

  Another embodiment of the present invention will be described with reference to FIG. This embodiment is an embodiment in which the structure of the truss 15 and the connecting reinforcing bar 20 is different from that of the first embodiment.

(1) The deck plate 1 is formed with connecting edges 2 and 3 so that both edges along the length direction can be raised and engaged with each other. Further, at both ends and the center of the deck plate 1, lengthwise connecting ribs 7 and 7 are formed in accordance with the grounding position of the truss to be used. Further, small ribs 11 and 11 in the length direction are formed at locations other than the connecting rib 7 of the truss 15.

(2) The truss 15 is arranged in a triangular shape in the length direction of the deck plate 1 such that the two main reinforcing bars 17 and 17 form the bottom with one main reinforcing bar 16 as the apex. The corrugated reinforcing bar (lattice material) 19 is arranged diagonally so that the main reinforcing bar 16 and one main reinforcing bar 17 and the main reinforcing bar 16 and the other main reinforcing bar 17 are connected to each other. The corrugated reinforcing bar 19 and the main reinforcing bars 16, 17, 17 are fixed by welding at the contact points.

The reinforcing bars are bent to form convex truss fixing parts 23, 23 between the flat parts 21, 21 at both ends to constitute a connecting reinforcing bar (suspended reinforcing bar, truss auxiliary material) 20. Between the truss fixing parts 23, 23, the intermediate part is the flat part 22.
And A truss 15 arranged with the main reinforcing bar 16 facing down is arranged on the truss fixing part 23 of the connecting reinforcing bar 20, and the main reinforcing bars 17 and 17 are fixed to the upper horizontal member 24 of the truss fixing parts 23 and 23.

(3) The connecting rebar 20 to which the truss 15 is attached is arranged on the upper surface 4 of the deck plate 1 so that the flat portions 21 and 22 are located on the coupling ribs 7 and 7 as in the first embodiment. . As in the first embodiment, if the upper electrodes 26 are applied to the upper and lower electrodes 26 and 27 while pressing the flat portions 21 and 22 downward (in the direction of arrow 32), the decks are connected via the coupling ribs 7 and 7. The plate 1 and the connecting rebar 20 with the truss 15 are fixed integrally. At this time, the welding allowance of the connecting ribs 7 and 7 becomes the recessed portion 8, and the flat portions 21 and 22 of the connecting rebar 20 are welded and fixed in a state of being fitted in the recessed portion 8, so that they are firmly fixed. Further, since a gap of a distance H ₀ (H ₀ = 2 to 3 mm) is formed between the lower edge 9 of the recessed portion 8 and the upper surface 4 of the deck plate 1, welding stripes are formed on the upper and lower surfaces 4 and 5 of the deck plate 1. Or the like does not occur (FIGS. 3B and 3C).

(5) The deck plate 30 with truss is configured as described above (FIG. 3A). Other embodiments are the same as those of the first embodiment (not shown).

  Another embodiment of the present invention will be described with reference to FIGS. In this embodiment, the structure of the truss 15 is different from that of the first embodiment, and the connecting reinforcing bar 20 is not used.

(1) As with the first and second embodiments, the deck plate 1 is formed with connecting edges 2 and 3 and connecting ribs 7 and 7 (height H ₀ ) in the length direction.

(2) The truss 15 is formed in a triangular shape from the main reinforcing bars 16, 17, 17 and the corrugated reinforcing bars 19, 19 as in the first embodiment. Further, unlike the first embodiment, the lower end portion of the corrugated reinforcing bar 19 protrudes downward from the main reinforcing bar 17 and bends outward to form a substantially U-shaped connecting portion 28 (FIG. 4). ).

(3) Subsequently, as in the first embodiment, the truss 15 is arranged on the upper surface 4 of the deck plate 1 so that the distal ends of the connecting portions 28 and 28 of the corrugated reinforcing bar 19 are placed on the coupling ribs 7 and 7. Subsequently, while pressing the connecting portion 28 downward (in the direction of the arrow 32) with the upper electrode 26, it is applied to the upper and lower electrodes 26 and 27, and the corrugated waves of the deck plate 1 and the truss 15 through the coupling ribs 7 and 7. The reinforcing bar 19 is fixed integrally. At this time, the recessed portion 8 is formed from the melting allowance of the coupling ribs 7, and the connecting portion 28 is fitted into the recessed portion 8 to be firmly fixed (FIGS. 5A and 5B). Further, since a gap (H ₀ ) is formed between the lower edge 9 of the recessed portion and the upper surface of the deck plate 1, there is no influence of application such as generation of welding stripes on the upper and lower surfaces 4, 5 of the deck plate 1. .

  The deck plate 30 with truss is configured as described above (FIG. 4). The use of the deck plate 30 with truss and other embodiments are the same as those in the first embodiment.

In the embodiment of the present invention, (a) is a side view, (b) and (c) are enlarged views of the J portion of (a), (b) is before welding, and (c) is after welding. Further, (d) is a sectional view taken along line KK in (b), and (e) is a sectional view taken along line LL in (c). Similarly, (a) is a plan view and (b) is a cross-sectional view taken along the line AA of FIG. 1 (a). In Example 2 of this invention, (a) is a side view, (b) is a sectional view taken along line FF in (a), and (c) is a sectional view taken along line GG in (b). In Embodiment 2 of the present invention, (a) is a plan view, (b) is a sectional view taken along line BB of (a), and (c) is a front view. Similarly, in another embodiment, (a) is a partially enlarged view of part C of FIG. 1 (a), and (b) is a partially enlarged view of part E of FIG. 1 (c). In the first embodiment of the present invention, the positions of the truss and the connecting reinforcing bar are changed. (A) is a side view, (b) is a sectional view taken along the line AA in FIG. 1 (a). is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deck plate 2, 3 Deck plate connection edge 4 Deck plate upper surface 5 Deck plate lower surface 7 Connection rib 8 Connection rib recessed part 9 Recessed edge lower edge 15 Truss 16 Main reinforcement 17 Main reinforcement 19 Corrugated reinforcement 20 Connection reinforcement 21 Flat part 22 of connecting reinforcing bar 23 Flat part of connecting reinforcing bar 23 Truss fixing part 26 of connecting reinforcing bar Upper electrode 27 Lower electrode 28 Connecting part 30 of corrugated reinforcing bar Deck plate with truss

Claims (2)

A deck plate with a truss formed by welding the lower end of the truss to the upper surface of the deck plate and fixing the truss.
(1) A coupling rib was formed on the top surface of the deck plate.
(2) A truss member or a truss member made of an auxiliary material for the truss was fixed by welding in a recessed portion formed in the coupling rib.
(3) A gap was formed between the lower edge of the recessed portion and the upper surface of the deck plate. A method of manufacturing a deck plate with a truss, characterized by manufacturing according to the following procedure.
(1) The deck plate has a connecting rib on the upper surface.
(2) A truss member made of a truss or a truss auxiliary material is placed on the deck plate.
(3) An upper electrode and a lower electrode are disposed on the upper surface side and the lower surface side of the deck plate with the coupling rib interposed therebetween.
(4) While pressing the truss member against the coupling rib with the upper electrode, energizing both electrodes to melt the coupling rib to form a recessed portion, and position the truss member in the recessed portion In this state, the truss member and the deck plate are fixed by welding.
(5) A gap is formed between the lower edge of the recessed portion and the upper surface of the deck plate.

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