JP3935464B2 - Deck plate with rebar truss, floor slab, and deck plate with rebar truss - Google Patents

Description

  The present invention relates to a deck plate with a reinforcing bar truss formed by arranging a plurality of trusses on a metal substrate, and in particular, a deck plate with a reinforcing bar truss that is used to construct a floor slab with a level difference. The present invention relates to a floor slab constructed using the deck plate and a manufacturing method for manufacturing the deck plate.

  Conventionally, as a deck plate with a reinforcing bar truss used to construct a floor slab, for example, a plurality of hanging bars are arranged at predetermined intervals on a metal substrate, and the upper end bar of the truss is fixed to the top of each hanging bar. There is something that holds a truss. Further, as this type of deck plate, there is also a type in which a void is further arranged between adjacent trusses in order to increase the thickness of the floor slab and reduce the weight of the floor slab as a countermeasure (for example, Patent Document 1). reference).

JP 2003-27647 A

The floor slab is formed by placing concrete on the deck plate with the reinforcing bar truss as described above, but in recent years, the floor slab with steps is increased in connection with the increasing demand for barrier-free mainly in condominiums and public facilities. The need to build is increasing.
FIG. 7 shows the floor structure of the bathroom part of the apartment house, in which a is the area of the bathroom where the unit bath is installed, b is the area of the undressing and washroom having an installation space such as a washing machine, c is the area of the corridor. In such a bathroom part, it is necessary to secure a facility space such as drainage below the finished floor, and therefore it is necessary to construct a floor slab having a level difference.

  Conventionally, in order to realize a floor slab having a level difference, for example, as shown in FIG. 8, two deck plates 101 and 101 with reinforcing truss are installed with different heights by a level difference h, and at the joint portion. The mold frame 100 is disposed, and reinforcements 105 and 106 are provided between the upper bars 103 and 103 and the lower bars 104 and 104 of the truss 102 of each deck plate 101 to reinforce them. In the figure, reference numeral 107 denotes a lattice bar of the truss 102, 108 denotes a hanging bar, and 109 denotes an end member.

  However, in the construction method in which the two deck plates 101 with rebar truss are installed in steps, an extra formwork 100 for placing concrete is required. In addition, the area of the projecting portion d to the downstairs becomes large, and there is a feeling of pressure, and the weight of the concrete block at the projecting portion d increases, increasing the amount of deflection over time. Furthermore, due to the complicated bar arrangement structure and the presence of voids in some cases, there is a problem that the operation of installing the reinforcing bar 106 between the lower end bars 104 and 104 is not easy and the workability is remarkably poor.

The present invention has been made paying attention to the above-mentioned problems, and does not require a formwork for placing concrete, and can also reduce the area of the projecting portion to the downstairs, requiring labor for reinforcement work with reinforcing bars. An object of the present invention is to provide a deck plate with a reinforcing bar truss having a level difference and a floor slab using the deck plate.
Another object of the present invention is to provide a manufacturing method by which a deck plate with a reinforcing bar truss having a step can be easily manufactured by using a conventional deck plate with a reinforcing bar truss as it is.

The deck plate with a reinforcing bar truss according to the present invention is formed by arranging a plurality of trusses including upper, lower and lattice bars on a metal substrate, and the substrate is a floor to be constructed. Each of the first and second bent portions is provided at a position corresponding to the step of the slab, and a step portion is formed between the first bent portion and the second bent portion. In each of the trusses, upper end bars are divided at positions corresponding to the first and second bent portions of the substrate, and the lower end bars are bent at the same angle as the substrate .

  In the deck plate with a reinforcing bar truss according to the present invention, since the substrate is continuous at the stepped portion, no formwork is required for placing concrete. In addition, since concrete is not placed below the stepped portion of the substrate, the area of the protruding portion to the downstairs is reduced, there is no feeling of pressure, and the upper end bars are divided, but reinforcement work with supplementary bars Easy and effortless.

In the above-described configuration of the present invention, the lattice muscle generally has a waveform shape. In addition, the truss has an upper end that is fixed to the upper end of the lattice and a lower end that is fixed to the lower end of the lattice, and each truss has, for example, a plurality of suspensions fixed on the substrate at predetermined intervals. The upper end muscle is fixed to the muscle and is suspended .
In addition to the structure described above, the truss has various modes such as one in which a lattice line is provided between one upper muscle and two lower muscles, and another having two upper muscles. There are things.

  In the above-described configuration of the present invention, each of the first and second bent portions is typically formed by bending the substrate. However, the present invention is not limited to this, and the end of the separated substrate is not limited thereto. It can also be formed by bonding using an adhesive tape in a state where the edges are butted.

  In the embodiment of the present invention, each truss has the lattice line divided at positions corresponding to the first and second bent portions of the substrate. For example, at the position corresponding to the first bent portion, The lattice muscle does not necessarily need to be divided.

  The floor slab according to the present invention is constructed by placing concrete on the deck plate with a reinforcing bar truss according to any of the embodiments described above, and the truss of the deck plate has a portion where the upper end bars are divided. Reinforced by a reinforcing bar.

The method of manufacturing a deck plate with a reinforcing bar truss according to the present invention is a pre-process for manufacturing a deck plate with a reinforcing bar truss by arranging a plurality of trusses including upper, lower and lattice bars on a flat metal substrate, A cutting process in which one end of each truss is cut and divided at one of the two positions corresponding to the level difference of the floor slab to be constructed, and on the other hand, the upper end is cut by a predetermined length and divided. Bending to form a step portion between the first bent portion and the second bent portion by bending the substrate and the bottom stripe at the same angle in the opposite directions at the two positions corresponding to the step of the power floor slab. A deck plate with a reinforcing bar truss having a step is manufactured by performing the steps.

  According to this manufacturing method, a deck plate with a reinforcing bar truss having a step can be easily manufactured by using a conventional flat deck plate with a reinforcing bar truss as it is. In addition, it is possible to carry out a pre-process at a factory to produce a conventional flat deck plate with a reinforcing bar truss, carry the deck plate to a construction site, and perform a cutting process and a bending process.

In addition, in order to manufacture the deck plate with a reinforcing bar truss of this invention, it can also be based on manufacturing methods other than the above-mentioned manufacturing method. For example, a deck plate with a dedicated reinforcing bar truss is prepared in advance by arranging a plurality of trusses whose upper end bars are separated at two positions corresponding to the level difference of the floor slab to be built on a flat metal substrate. In the construction, the substrate and the bottom stripe are bent at the same angle in the opposite directions at two positions corresponding to the level difference of the floor slab to be constructed, and the first bent portion and the second bent portion are A deck plate with a reinforced truss with a step is produced by forming a step portion between them. This manufacturing method has the advantage that the cutting process at the construction site can be omitted.

According to the present invention, there is no need for a special formwork for placing concrete, and the area of the projecting portion to the downstairs can be reduced, and there is a stepped reinforcing bar truss that does not require labor for reinforcement work. A deck plate can be manufactured, and a floor slab with a level difference can be easily realized.
Moreover, according to the manufacturing method of this invention, the deck plate with a reinforcing bar truss with a level | step difference can be easily manufactured using the conventional flat deck plate with a reinforcing bar truss as it is.

1 and 2 show a deck plate with a reinforcing bar truss according to an embodiment of the present invention.
The deck plate 1 with a reinforcing bar truss in the illustrated example is used to construct a floor slab having a step, and a plurality of trusses 3 are arranged in parallel on a substrate 2. The substrate 2 is formed of a galvanized steel plate, and supports a load in cooperation with the truss 3 and a suspension bar 4 to be described later and temporarily holds fluid concrete so that it does not spill. A plurality of ribs 20 extending in the length direction are formed on the plate surface of the substrate 2 in order to ensure spot welding and reinforce.

Each truss 3 includes an upper end bar 31 and a lower end bar 32 which are parallel to each other, and the upper end bar 31 is fixed to the top of the corrugated lattice bar 33 and the lower end bar 32 is integrally fixed to the bottom by spot welding. . The upper bar 31 and the lower bar 32 are linear steel bars, and the lattice bar 33 is formed by bending an iron wire. The truss 3 supports the load including the weight of concrete and transmits it to the support bars 5 and 5 at both ends. Note that the support bars 5 at both ends are fixed to the upper end 31 of the truss 3 at the upper end and to the substrate 2 at the lower end.
At the time of temporary installation, the truss structure serves as a suspension frame, and at the time of main installation, the upper and lower bars 31 and 32 serve as slab main bars of reinforced concrete to resist the tensile force generated by the moment, and the lattice bars 33 Serves as a spacer for maintaining the distance between the upper and lower stripes 31 and 32.

A plurality of suspension bars 4 for vertically suspending the trusses 3 are arranged on the substrate 2 at predetermined intervals. The suspension bars 4 are arranged in parallel to each other in the direction orthogonal to the truss 3, that is, in the width direction of the substrate 2.
Each suspending bar 4 is a series of inverted V-shaped peaks 4a and horizontal valleys 4b alternately arranged. Each trough 4b is fixed to the surface of the substrate 2 by spot welding in a state where the crest 4a is raised. The upper end bars 31 of the truss 3 are fixed to the tops of the peak portions 4a of the suspension bars 4, and are thereby suspended vertically. The height of the peak portion 4a of the suspension bar 4 is set in consideration of the cover thickness necessary for the reinforced concrete between the lower end bar 32 of the truss 3 and the substrate 2.
The suspension bar 4 functions so as to apply a load on the base plate 2 serving as a piercing plate to the truss 3 at the time of temporary installation, and the upper bar 31 and the lower bar 32 of the truss 3 at the time of placing concrete. There is a function to hold in an appropriate position. Furthermore, at the time of main installation, there is also a function of dispersing cracks in the concrete in the main reinforcement direction.

  The substrate 2 includes a first bent portion 21 bent at an angle α in a positive direction (clockwise direction CW in the illustrated example) at a position corresponding to a step of the floor slab to be constructed, and a negative opposite to the above. The second bent portion 22 is bent in the direction (for example, counterclockwise direction CCW) by the same angle α. Between the first bent portion 21 and the second bent portion 22, a step portion 2c having an inclination angle α that is continuous with the horizontal upper portion 2a and the horizontal lower end portion 2b is formed. The inclination angle of the step portion 2c can be freely set in the range of 0 to 90 degrees according to the step of the floor slab to be constructed.

  The lower end bars 32 of the trusses 3 are also bent at the same angle α as the substrate 2 at positions corresponding to the first and second bent portions 21 and 22 of the substrate 2, respectively. Bent portions 34 and 35 are formed. With respect to the distance between the substrate 2 and the lower truss 32 on the truss 3, the stepped portion 2c of the substrate 2 is narrower than the upper and lower portions 2a and 2b due to the bending of the substrate 2 and the lower strip 32.

  On the other hand, the upper end bars 31 of the trusses 3 are divided at positions corresponding to the first and second bent portions 21 and 22 of the substrate 2. Further, the lattice stripe 33 is also divided at positions corresponding to the first and second bent portions 21 and 22 of the substrate 2. Here, the reason why the upper end line 31 and the lattice line 33 are divided at the positions of the bent portions 21 and 22 is to allow the lower end line 32 of the substrate 2 and the truss 3 to be bent.

3 (1) to 3 (3) show specific examples of the manufacturing method of the above-described deck plate 1 with a reinforcing bar truss. In this embodiment, a deck plate 1 with a reinforcing bar truss having a step is manufactured by using a conventional flat deck plate 10 with a reinforcing bar truss as it is.
A conventional deck plate 10 with a reinforcing bar truss has a plurality of trusses 3 arranged side by side with a plurality of hanging bars 4 on a flat metal substrate 2. The deck plate 10 with a reinforcing bar truss is manufactured and stored in advance at a factory or the like. Next, the necessary number of flat deck plates 10 with rebar trusses are transported to the construction site, the cutting process and the bending process are carried out at this construction site to produce a deck plate 1 with reinforced truss. A floor slab with a level difference is constructed using a deck plate 1 with a reinforcing bar truss.

  At the construction site, first, as shown in FIG. 3 (1), the upper end bars 31 of each truss 3 are cut and divided at one of two positions corresponding to the level difference of the floor slab to be constructed, and on the other hand, The upper end muscle 31 is cut by a predetermined length L and divided. In the same figure, 31P shows the part by cutting, and 31Q shows the part by cutting. In addition, the lattice muscle 33 of each truss 3 is cut and divided at one of the same two positions, and the lattice muscle 33 is cut by a predetermined length and divided. The length for excising the upper end muscle 31 and the lattice muscle 33 is determined according to the inclination angle of the stepped portion 2c.

  Next, as shown in FIG. 3 (2), one of the two positions corresponding to the level difference of the floor slab to be constructed, the bottom stripe 32 of the substrate 2 and the truss 3 is indicated in the forward direction (indicated by arrows in the figure). ) To be bent at an angle α to form first bent portions 21 and 34 at the same time. Further, as shown in FIG. The second bent portions 22 and 35 are formed at the same time by bending the same angle α. As a result, in the substrate 2, a stepped portion 2 c that is continuous with the upper step portion 2 a and the lower step portion 2 b is formed between the first bent portion 21 and the second bent portion 22. In addition, by this bending, the upper part 31 has one part 31P pushed and widened, and the other part 31Q is narrowed.

In the figure, reference numeral 6 denotes a reinforcing bar for reinforcing the split portions 31P and 31Q of the upper end bar 31 of the truss 3, which is a shape along the shape of the upper end bar 31 and is sufficient with the upper stage part 2a and the lower stage part 2b. It is formed to overlap in length.
Reference numeral 50 denotes an intermediate support bar provided at the split portions 31P and 31Q of the upper end bar 31. Reference numeral 36 denotes an S-shaped or J-shaped bridge spanned between the upper and lower bar bars 31 and 32 of the truss 3. It is a lifting reinforcement.

  In the above embodiment, the lattice muscle 33 of each truss 3 is cut and divided at one of the two positions corresponding to the level difference of the floor slab to be constructed, and on the other hand, the lattice muscle 33 is cut by a predetermined length. However, as shown in FIGS. 4 (1) and 4 (2), it is not always necessary to cut the lattice 33 at a position corresponding to the first bent portions 21 and 34. In this embodiment, the lattice bar 33 functions as a lifting reinforcement bar, and thus it is not always necessary to provide the lifting reinforcement bar 36 such as the S-shape.

FIG. 5 shows a stepped floor slab constructed by placing concrete 7 on the deck plate 1 with a reinforcing bar truss of the embodiment shown in FIG. 3, and the truss 3 of the deck plate 1 with the reinforcing bar truss has an upper end. The divided portions 31P and 31Q of the line 31 are reinforced by the reinforcing bar 6.
In the figure, reference numerals 60 and 61 denote reinforcing bars embedded in order to prevent the concrete 7 from going into an unreinforced state. Reference numeral 70 denotes a support member for supporting the deck plate 1 with a reinforcing bar truss when the concrete 7 is placed.

  In the above-described embodiment, since the substrate 2 is continuous at the step portion 2c, no formwork is required for placing the concrete 7. Further, since the stepped portion 2c of the substrate 2 is inclined and the concrete 7 is not placed therebelow, the area of the protruding portion downstairs is small, and there is no feeling of pressure. Furthermore, although the upper end bar 31 is divided, the lower end bar 32 is not divided. Therefore, it is not necessary to reinforce the lower end bar 31 and the reinforcing work by the reinforcing bar 6 is easy.

  FIGS. 6A and 6B show a bending method capable of bending the substrate 2 and the lower end stripe 32 of the truss 3 at the same time. In this bending method, a bending machine 8 using the “lever principle” is used, and the first bent portions 21 and 34 and the second bent portions of the substrate 2 and the lower end bars 32 of the trusses 3 are used. The parts 22 and 35 are generated simultaneously.

  The bending machine 8 in the illustrated example includes a work machine base 80 installed on a floor surface, and two bar-shaped levers 81, 81 disposed on both sides of the work machine base 80. The work machine base 80 is configured by combining a plurality of L-shaped steels. The work machine base 80 has a first support for the fulcrum F of each lever 81 and the flat deck plate 10 with a reinforcing bar truss to be processed. The first action part W1 for applying a bending force for generating the bent parts 21 and 34 and the second action part W2 for applying a bending force for forming the second bent parts 22 and 35 are provided. And are set.

  The fulcrum F is formed by engaging a support shaft 85 with a support table 82 having an I-shaped cross section installed on the work machine table 80. The support base 82 supports the substrate 2 of the deck plate 10 with a reinforcing bar truss on the upper surface of the horizontal portion 83, and engages the support shaft 85 at a portion where the horizontal portion 83 and the vertical portion 84 intersect with each other. Projecting to both sides of the support base 82 to form a fulcrum F.

  The first action portion W1 includes an upper surface edge 83a of the horizontal portion 83 of the support base 82, a substrate 2 of the deck plate 10 with a reinforcing bar truss supported on the support base 82, and a lower end stripe 32 of each truss 3. It is comprised with the support bar 86 inserted between. The support bar 86 is a round bar having a diameter corresponding to the distance between the substrate 2 and the lower end bar 32, and is positioned on the upper surface edge 83 a of the horizontal portion 83. When a downward force is applied to the deck plate 10 with a reinforcing bar truss, the substrate 2 is pressed against the upper surface edge 83a of the horizontal portion 83, and the lower bar 32 of each truss 3 is pressed against the support bar 86, and bent downward.

The second action portion W2 is formed with an arcuate guide groove 89 between a pair of curved frame members 89A and 89B provided on both sides of the work implement base 80, and two guide grooves 89 are added to each guide groove 89. Both ends of the pressure rods 87A and 87B are configured to freely engage with each other. The center of the arc in the guide groove 89 is located on the upper surface edge 83 a of the horizontal portion 83 of the support 82.
The second pressure bar 87B is positioned between the substrate 2 of the deck plate 10 with the reinforcing bar truss and the lower end bar 32 of each truss 3, and the first pressure bar 87A is positioned on the lower bar 32 of each truss 3. Let The first and second pressure bars 87A and 87B are round bars having the same diameter as the support bar 86. When a downward force is applied to the first and second pressure rods 87A and 87B, the pressure rods 87A and 87B are pushed and slide in the guide groove 89. At this time, the substrate 2 is subjected to the second pressure. The lower bar 32 is pressed by the first pressure bar 87A and bent upward by the bar 87B.

The support rod 85 of the fulcrum F and the pressure rods 87A and 87B of the second action portion W2 are sufficiently longer than the width of the deck plate 10 with a reinforcing bar truss, and both end portions protrude to both sides. The two levers 81 are passed through the both sides of the deck plate 10 with a reinforcing bar truss, and the front ends are engaged with both ends of the support bar 85 from below. The central part of the length of each lever 81 is pressed against the first pressure rod 87A from above. When both the levers 81 are pushed down simultaneously in this set state, pressure is applied to the base plate 2 of the reinforcing plate truss deck plate 10 and the lower end reinforcement 32 of each truss 3 in the first action portion W1 and the second action portion W2. The first bent portions 21 and 34 and the second bent portions 22 and 35 are formed at the same time as both end portions of the pressure rods 87A and 87B slide in the guide groove 89. A deck plate with a reinforced truss is obtained.
During bending work, one end of the rebar trussed deck plate 10 is pressed by the pressing member 9 so that it does not float, and the other end is supported by a support base 90 that can be raised and lowered.

It is a perspective view of the deck plate with a rebar truss with a level | step difference which is one Example of this invention. It is a front view of the deck plate with a reinforcing bar truss of FIG. It is a side view which shows in steps the manufacturing method of the deck plate with a reinforcing bar truss with a level | step difference. It is a side view which shows the other example of a manufacturing method in steps. It is a side view which shows the floor slab constructed | assembled using the deck plate with a reinforcing bar truss of FIG. It is a side view which shows the bending method and bending machine of a deck plate with a reinforcing bar truss. It is sectional drawing which shows the floor structure of the bathroom part of an apartment house. It is a side view which shows the floor slab with a level | step difference constructed | assembled by the conventional deck plate with a reinforcing bar truss.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deck plate with a reinforcing bar truss 2 Board | substrate 2c Level difference part 3 Truss 4 Hanging bar 6 Reinforcement 7 Concrete 10 Flat deck plate with a reinforcing bar truss 21 1st bending part 22 2nd bending part 31 Upper end bar 32 Bottom muscle 33 Lattice muscle

Claims (5)

A deck plate with a reinforcing bar truss formed by arranging a plurality of trusses including upper, lower and lattice bars on a metal substrate, the substrate corresponding to a step of a floor slab to be constructed Each of the first and second bent portions is formed at a position, and a step portion is formed between the first bent portion and the second bent portion. 1. A deck plate with a reinforcing bar truss, wherein upper end bars are divided at positions corresponding to the first and second bent portions, and lower end bars are bent at the same angle as the substrate . The deck plate with a reinforcing bar truss according to claim 1, wherein each truss is suspended by a hanging bar fixed on the substrate at a predetermined interval . 3. The deck plate with a reinforcing bar truss according to claim 1, wherein each truss is divided into lattice bars at positions corresponding to the first and second bent portions of the substrate . A floor slab constructed by placing concrete on a deck plate with a reinforcing bar truss according to any one of claims 1 to 3, wherein the truss of the deck plate is provided with a portion where the upper end bars are divided. Floor slabs reinforced with streaks . Pre-process to manufacture a deck plate with a reinforcing bar truss by arranging a plurality of trusses including upper, lower and lattice bars on a flat metal substrate, and two locations corresponding to the steps of the floor slab to be constructed The cutting process in which the upper end of each truss is cut and divided at one of the positions, and the other upper end is cut off by a predetermined length on the other side, and the two positions corresponding to the steps of the floor slab to be constructed With a reinforcing bar truss having a step by bending the substrate and the bottom bar in the opposite direction by the same angle to form a step portion between the first and second bent portions. A method of manufacturing a deck plate with a reinforcing bar truss, characterized by manufacturing a deck plate .

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