JP2012087548A - Deck plate with reinforced truss - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sufficient weld strength without easily generating a weld defect between a lattice bar and an upper end bar by facilitating welding work between the lattice bar and the upper end bar.SOLUTION: A deck plate 1 with a reinforced truss is formed by arranging a plurality of trusses 3 side by side on a metal base plate 2. Each truss 3 includes a linear upper end bar 5 and a lattice bar 4 in a wavy shape for which crest parts 41 and trough parts 42 are repeated and the respective trough parts 42 are alternately shifted by the same width in right and left right opposite directions. The lattice bar 4 is vertically arranged with the crest parts 41 on top on the base plate 2. The upper end bar 5 is arranged in parallel with the base plate 2 at the position of the peak parts 41a of the crest parts 41 of the lattice bar 4. In a contact state that the peak parts 41a of the respective crest parts 41 of the lattice bar 4 obliquely cross the upper end bar 5 over the upper end bar 5, the respective peak parts 41a are fixed by welding to the upper end bar 5. The bottom parts 42a of the respective trough parts 42 of the lattice bar 4 are fixed by welding to ribs 21,22 projected on the surface of the base plate 2 respectively.

Description

  The present invention relates to a deck plate with a reinforcing bar truss for constructing a reinforced concrete slab by placing concrete on an upper surface.

  Conventionally, various types of deck plates with rebar trusses have been proposed, and a structure in which a plurality of trusses formed by connecting upper and lower bars with corrugated lattice bars on a metal substrate is arranged side by side. Things are common. In addition to this type of deck plate with a reinforcing bar truss, a rib that replaces the lower end bar is projected at the construction position of the truss on the surface of the board, and the bottom of the lattice bar is fixed to the side of the rib by welding, As shown in FIGS. 11 (1) to 11 (3), a pair of left and right ribs 101 and 102 are projected at the construction position of the truss on the surface of the substrate 100, and the troughs 111 of the lattice 110 are alternately opposite to the left and right. There has also been proposed a method in which each valley bottom portion 111a is alternately fixed to the left and right ribs 101, 102 by welding with the same width (see, for example, the examples of FIGS. 5 to 7 of Patent Document 1). Furthermore, as shown in FIG. 12, each of the valley portions 111 and 111 swung to the left and right of the lattice muscle 110 are fixed to the lower end muscle 120 by welding, and each leg bottom portion 111a is bent outward. There has also been proposed a structure in which 112 and 112 are fixed to the surface of the substrate 100 by welding (see, for example, the examples of FIGS. 7 to 10 of Patent Document 2).

Japanese Patent No. 3310440 Japanese Patent No. 4164511

  In any of the deck plates with a reinforcing bar truss, the top 113a of the peak 113 of the lattice bar 110 is abutted against the lower surface of the upper end bar 130 and spot contact is applied to the contact portion, whereby the lattice bar 110 and the upper bar 130 are integrated. Although the welding operation is performed while maintaining the state in which the top portion 113a of the peak portion 113 of the lattice muscle 110 is abutted against the upper end muscle 130, the welding operation is difficult and the work efficiency is not low. Further, poor welding is likely to occur between the top portion 113a of the peak 113 of the lattice bar 110 and the upper end bar 130, and the welding strength may be insufficient. As a result, if the upper streak 130 is stepped on during construction, the welded part may be separated and the upper rebar 130 and the lattice rebar 110 may be separated, and when a compressive force is applied to the upper rebar 130 when placing concrete. It is impossible to suppress the horizontal deformation of the upper end stripe 130.

  In order to solve the above-mentioned problem, the top 113a of the peak 113 of the lattice muscle 110 is crushed and processed flat to make the contact state with the upper end muscle 130 stable. This process increases the number of manufacturing steps of the lattice muscle 110, which increases the cost.

  This invention was made by paying attention to the above-mentioned problem, does not require processing such as flattening the top of the peak of the lattice, and easy welding work between the lattice and the top muscle, As a result, it is an object of the present invention to provide a deck plate with a reinforcing bar truss that is unlikely to cause poor welding between the lattice bars and the top bars, and that can provide sufficient welding strength.

  The deck plate with a reinforcing bar truss according to the present invention comprises a plurality of trusses arranged side by side on a metal substrate, and each of the trusses has a straight upper end bar, a peak portion and a valley portion. , And each valley portion includes a wavy lattice lattice that alternately swings in the opposite direction of the left and right by the same width. The lattice stripes are arranged vertically on the substrate with the crests facing upward, and the upper end stripes are arranged parallel to the substrate at the tops of the crest portions of the lattice stripes. The top of each peak of the lattice muscle crosses the top muscle and crosses the upper muscle diagonally, and each top is fixed to the top muscle by welding, and the bottom of each valley of the lattice muscle is the surface of the substrate. Are fixed to the ribs projecting from each other by welding.

  In the deck plate with a reinforcing bar truss having the above configuration, each apex is welded to the upper end in a contact state where the apex of each peak portion of the lattice muscle crosses the upper end diagonally with the upper end, so during the welding operation, Since the upper end is in a state of being encased in the lattice, it is easy to perform the welding operation, and the weld between the lattice and the upper end is reliably welded, so that poor welding hardly occurs. As a result, sufficient welding strength can be obtained, and even if the upper end reinforcement is stepped on during construction, there is no possibility that the welded part is peeled and the upper end reinforcement and the lattice reinforcement are separated. Even if the welded part is peeled off, the upper bar is wrapped in the lattice, so that when the concrete is placed, the upper bar does not deform in the horizontal direction against the compressive force acting on the upper bar. Restrained by

In a preferred embodiment of the present invention, the ribs are a pair of left and right ribs inclined inward from each other, and a valley bottom portion that swings in the opposite direction of the left and right of the lattice is fixed to the outer surface of each rib by welding. .
According to this embodiment, since each rib and the bottom of the valley of the lattice line are opposed to each other, good welding strength can be obtained by surface contact between them. Further, since welding is performed by applying the valley bottom portion that swings in the opposite direction of the left and right of the lattice from the outside of each rib, the welding operation is easy to perform.

  In another deck plate with a reinforcing bar truss according to the present invention, each of the trusses has a straight upper and lower bars, a peak and a valley, and each valley alternately has the same width in opposite directions on the left and right. It includes a wavyly shaped lattice muscle that only swings. Lattice muscles are placed vertically on the substrate with the peaks facing upward, the upper edge is located at the top of the peak of the lattice, and the lower muscle is located above the bottom of the valley of the lattice. Are arranged in parallel. While the top of each peak of the lattice muscle crosses the top muscle and crosses the upper muscle diagonally, each top is fixed to the top muscle by welding, and the bottom of each valley of the lattice is the surface of the substrate In addition, the upper position of each valley bottom is fixed to the bottom stripe by welding.

  Also in the deck plate with a rebar truss with the above configuration, each peak is welded to the top bar in a contact state where the top of each peak of the lattice bar crosses the top bar diagonally with the top bar, so during welding work Since the upper end is in a state of being encased in the lattice, the welding operation is easy to perform, and the lattice and upper end are reliably welded so that poor welding hardly occurs. As a result, sufficient welding strength can be obtained, and even if the upper end reinforcement is stepped on during construction, there is no possibility that the welded part is peeled and the upper end reinforcement and the lattice reinforcement are separated. Even if the welded part is peeled off, the upper bar is wrapped in the lattice, so that when the concrete is placed, the upper bar does not deform in the horizontal direction against the compressive force acting on the upper bar. Restrained by

In a preferred embodiment of the present invention, the lattice has a leg portion formed by bending each valley bottom, and each leg portion is fixed to the surface of the substrate by welding.
According to this embodiment, the proof stress of the upper end reinforcement in the direction orthogonal to the truss increases, and the upper end reinforcement is prevented from being deformed and buckled in the horizontal direction when placing concrete.

In a further preferred embodiment of the present invention, the lattice muscle is formed by bending a corrugated iron wire in which the same amplitude wave repeats at the same pitch on the same plane over the entire length of the amplitude portion, Each bent portion of the iron wire constitutes a peak portion of the lattice, and the corrugated peak and valley portion of the iron wire constitutes the valley portion of the lattice.
According to this embodiment, it is possible to easily manufacture the lattice line simply by bending the corrugated iron wire at the center of its amplitude.

  According to the present invention, during the welding operation, the upper end muscle is encased in the lattice muscle, so that the welding operation is easy and the work efficiency is not lowered, and the lattice muscle and the upper end muscle are reliably welded. , Weld defects are less likely to occur. As a result, sufficient welding strength can be obtained, and even if the upper end reinforcement is stepped on during construction, there is no possibility that the welded part is peeled and the upper end reinforcement and the lattice reinforcement are separated. Even if the welded part is peeled off, the upper bar is wrapped in the lattice, so that when the concrete is placed, the upper bar does not deform in the horizontal direction against the compressive force acting on the upper bar. Restrained by

It is a perspective view which shows the external appearance of the principal part of the deck plate with a reinforcing bar truss which is 1st Example of this invention. It is a side view which expands and shows a 1st Example. It is a front view which expands and shows a 1st Example. It is the top view which abbreviate | omitted and showed a part of length direction for the 1st Example. It is a top view which shows the corrugated iron wire used for manufacture of a lattice muscle. It is a front view which shows the method of manufacturing a lattice reinforcement from the iron wire of FIG. It is a perspective view which shows the external appearance of the deck plate with a reinforcing bar truss which is 2nd Example of this invention. It is a side view which expands and shows a 2nd Example. It is a front view which expands and shows a 2nd Example. It is the top view which abbreviate | omitted and showed a part of length direction 2nd Example. The structure of the conventional deck plate with a reinforcing bar truss is shown, (1) is a front view, (2) is a side view, (3) is a plan view. It is a front view which shows the structure of the other conventional deck plate with a reinforcing bar truss.

1 to 4 show the appearance and configuration of a deck plate 1 with a reinforcing bar truss according to a first embodiment of the present invention.
The deck plate 1 with a reinforcing bar truss in the illustrated example is used for constructing a floor slab, and includes a plurality of trusses 3 arranged side by side on a metal substrate 2. The substrate 2 in the illustrated example is formed of a galvanized steel plate and supports a load in cooperation with the truss 3 at the time of temporary installation and holds the fluid concrete so that it does not spill. For convenience of explanation, the figure shows the main part of two trusses 3 arranged side by side. However, the arrangement interval and the number of the trusses 3 are appropriately set according to the size of the substrate 2.

  A pair of left and right ribs 21 and 22 are integrally projected along the length direction at the installation position of each truss 3 on the surface of the substrate 2. In addition, between the ribs 21 and 22 on the surface of the substrate 2 and between the adjacent trusses 3 and 3, in order to increase the rigidity in the direction (width direction) orthogonal to the length direction of the substrate 2, the reinforcement for extending along the width direction A plurality of ribs 23 are integrally formed in parallel. Each of the ribs 21 and 22 along the length direction has a form of standing like a strip from the surface of the substrate 2, and the ribs 21 and 22 forming a pair are inclined inward from each other. The reinforcing ribs 23 along the width direction have a form in which the surface of the substrate 2 bulges upward in a convex shape, but is not limited to this, and has a form in which the surface of the substrate 2 is recessed downward. Alternatively, every other convex and concave ones may be formed alternately.

  Each truss 3 includes an upper end bar 5 made of a straight steel bar and a lattice bar 4 formed by bending an iron wire into a corrugated shape. The lattice 4 is arranged vertically on the substrate 2 with the peak portion 41 facing upward, and the upper muscle 5 and the left and right ribs 21 and 22 on the substrate 2 are connected by the lattice 4 to form the truss 3. ing.

  The lattice stripe 4 has a ridge 41 and a valley 42 that repeat vertically up and down along a plane perpendicular to the surface of the substrate 2 (hereinafter simply referred to as “vertical plane”). The surface is swung alternately by the same width in opposite directions on the left and right sides, and forms a downward spread. The top muscle 5 is arranged in parallel with the substrate 2 at the position of the top 41 a of the peak 41 of the lattice 4, and the top 41 a of each peak 41 of the lattice 4 straddles the top muscle 5. In this straddled portion, the apex 41a of the peak 41 of the lattice 4 crosses the upper end 5 obliquely, and its inner peripheral surface is in wide contact with the outer peripheral surface of the upper end 5, and the apex 41a and the upper end are in this contact state. The streak 5 is integrally fixed by spot welding.

  The valley bottom 42a of each valley 42 swung in the opposite direction of the lattice 4 alternately contacts the outer surfaces of the pair of left and right ribs 21 and 22 raised from the surface of the substrate 2, and each valley bottom 42a in the contact state. And the ribs 21 and 22 are integrally fixed by spot welding. The ribs 21 and 22 are not limited to the form of the illustrated example standing up independently, but may be a trapezoidal continuous form as shown by a one-dot chain line in FIG.

  The lattice muscle 4 in the illustrated example is an iron wire 7 having a form as shown in FIG. 5, that is, a corrugated iron wire 7 in which waves having the same amplitude A are repeated at the same pitch B on the same surface, as shown in FIG. As shown in (3), it is formed by pressing and bending in the direction indicated by P in the figure until a predetermined angle θ (for example, 30 degrees) is reached over the entire length at the center c of the amplitude A. . Each bent portion 70 of the iron wire 7 becomes the top 41 a of the peak 41 of the lattice 4, and the peak 71 and the valley 72 of the iron wire 7 constitute the valley 42 of the lattice 4.

FIGS. 7-10 has shown the external appearance and structure of the deck plate 1 with a reinforcing bar truss which is the 2nd Example of this invention.
Each truss 3 includes an upper bar 5 and a lower bar 6 made of straight steel bars, and a lattice bar 4 formed by bending an iron wire into a corrugated shape. The lattice stripe 4 is arranged vertically on the substrate 2 with the peak portion 41 facing upward, and the upper stripe 5, the lower stripe 6, and the substrate 2 are connected by the lattice stripe 4 to constitute the truss 3. In the figure, reference numeral 23 denotes a reinforcing rib formed on the surface of the substrate 2.

  The lattice stripe 4 is such that a crest 41 and a trough 42 repeat up and down along a plane (vertical plane) perpendicular to the surface of the substrate 2, and each trough 42 is alternately left and right with respect to the vertical plane. Are swung in the opposite direction by the same width and are parallel to each other. The upper muscle 5 is arranged at the position of the top 41 a of the peak 41 of the lattice 4, and the lower muscle 6 is arranged above the valley bottom 42 a of the valley 42 of the lattice 4 in parallel with the substrate 2. The top 41a of each mountain 41 of the lattice muscle 4 is straddling. In this straddled portion, the apex 41a of the peak 41 of the lattice 4 crosses the upper end 5 obliquely, and its inner peripheral surface is in wide contact with the outer peripheral surface of the upper end 5, and the apex 41a and the upper end are in this contact state. The streak 5 is integrally fixed by spot welding.

The bottom part 42a of each trough part 42 swung in the opposite direction of the lattice 4 is bent outward to form a leg part 44. Each leg 44 is fixed to the surface of the substrate 2 and the upper position of the leg 44 is fixed to the bottom stripe 6 by spot welding. In addition, the leg part 44 can be formed in arbitrary shapes, such as circular arc shape, rectangular shape, and triangular shape.
Further, in the illustrated example, the valley bottom portions 42a of the lattice muscle 4 are alternately bent in opposite directions, and the directions of the legs 44 are alternately changed. The direction of each leg 44 may be matched by bending in the direction.

  Similarly to the first embodiment, the lattice muscle 4 of the second embodiment described above has a corrugated iron wire 7 in which the same amplitude wave repeats at the same pitch on the same plane over the entire length of the center portion of the amplitude. It can be formed by bending. In the second embodiment, the iron wire 7 is bent until the bent portions are parallel to each other.

In each of the first and second embodiments described above, the trusses 3 are arranged in parallel to each other and support loads such as the weight of concrete and transmit them to the end members 8 and 8 at both ends. Note that the end members 8 at both ends have an upper end fixed to the upper end bar 5 of the truss 3 and a lower end fixed to the substrate 2. Each truss 3 works as a suspending force frame in the truss structure at the time of temporary installation, and at the time of main installation, the pulling force generated by the moment with the upper reinforcement 5, the ribs 21 and 22, and the lower reinforcement 6 as slab main reinforcement of reinforced concrete. Play a role in resisting.
Although not shown, the upper end bars 5 and 5 of the adjacent trusses 3 and 3 are connected by a plurality of connecting bars.

  In the first embodiment shown in FIG. 1 to FIG. 4, the top portions 41 a of the peak portions 41 a of the lattice muscle 4 straddle the upper end muscles 5 and obliquely cross the upper end muscles 5. Since the upper end muscle 5 is encased in the lattice muscle 4 during the welding operation, it is easy to perform the welding operation, and the lattice muscle 4 and the upper end muscle 5 are reliably welded. Welding failure is unlikely to occur. As a result, sufficient welding strength is obtained, and even if the upper end reinforcement 5 is stepped on at the time of construction, there is no possibility that the welded part is separated and the upper end reinforcement 5 and the lattice reinforcement 4 are separated. Even if the welded part is peeled off, the upper end bars 5 are encased in the lattice bars 4, so that when the concrete is placed, the upper end bars 5 are in the horizontal direction against the compressive force acting on the upper end bars 5. It is restrained so as not to deform.

  Also in the second embodiment shown in FIGS. 7 to 10, each apex 41 a is in contact with the top 41 a of each peak 41 of the lattice 4 crossing the upper end 5 diagonally across the upper end 5. Since it is welded to the upper muscle 5, the upper muscle 5 is encased in the lattice 4 at the time of the welding operation, so that the welding work is easy to perform, and the lattice 4 and the upper muscle 5 are reliably welded. , Weld defects are less likely to occur. As a result, sufficient welding strength can be obtained, and even if the upper reinforcement is stepped on during construction, there is no possibility that the welded part is separated and the upper reinforcement 5 and the lattice 4 are separated. Even if the welded part is peeled off, the upper end bars 5 are encased in the lattice bars 4, so that when the concrete is placed, the upper end bars 5 are in the horizontal direction against the compressive force acting on the upper end bars 5. It is restrained so as not to deform.

DESCRIPTION OF SYMBOLS 1 Deck plate with a reinforcing bar truss 2 Substrate 3 Truss 4 Lattice muscle 5 Upper muscle 6 Lower muscle 21 and 22 Rib 41 Mountain part 41a Top part 42 Valley part 42a Valley bottom part 44 Leg part

Claims (5)

  A deck plate with a reinforcing bar truss in which a plurality of trusses are arranged side by side on a metal substrate, and each of the trusses has a straight upper end, a peak and a valley, and each valley Includes a wavy latticed lattice that swings by the same width in the opposite direction to the left and right.The lattice is arranged vertically on the substrate with the peak facing up, and the upper end is the top of the peak of the lattice. Each apex of each peak of the lattice muscle is fixed to the top muscle by welding in a contact state where the top of each peak of the lattice muscle crosses over the top muscle and obliquely crosses the top muscle by welding. A deck plate with a reinforcing bar truss, in which the bottom of each valley is fixed to a rib protruding from the surface of the substrate by welding.   The said rib is a pair of right and left ribs which incline mutually, and the trough bottom which swung to the opposite direction of the left and right of the lattice was fixed to the outer surface of each rib by welding. Deck plate.   A deck plate with a reinforcing bar truss in which a plurality of trusses are arranged side by side on a metal substrate, and each of the trusses has a linear upper and lower bars, and a peak and a valley. Each trough includes a wavy lattice lattice that alternately swings in the opposite direction to the left and right, the lattice muscle is arranged vertically on the substrate with the mountain portion facing up, and the top muscle is the lattice muscle. At the top of the peak, the lower end is located above the bottom of the valley of the lattice, parallel to the substrate, and the top of each peak of the lattice is diagonal to the upper The tops of the lattice bars are fixed to the upper surface of the base plate by welding in a crossed contact state, and the bottoms of the valleys of the lattice lines are fixed to the surface of the substrate by welding. Deck plate with rebar truss.   The deck plate with a reinforcing bar truss according to claim 3, wherein the lattice bars have leg portions formed by bending the bottom portions of the valleys, and each leg portion is fixed to the surface of the substrate by welding.   The lattice bars are formed by bending a corrugated iron wire having the same amplitude wave repeated on the same plane at the same pitch over the entire length of the central portion of the amplitude, and each bent portion of the iron wire is a lattice line. The deck plate with a reinforcing bar truss according to claim 1 or 3, wherein the corrugated peaks and valleys of the iron wire form a valley of the lattice bars.

Images