JP7076101B2 - Construction method of synthetic slab - Google Patents

Description

The present invention relates to a method for constructing a synthetic slab using a spacer for reinforcing bars that supports reinforcing bars on a deck plate having a beam portion protruding on the upper surface, and in particular, crack expansion used during construction of the synthetic slab. It relates to a construction method of a synthetic slab in which a spacer for reinforcing bars is arranged across a beam portion in order to support a wire mesh laid as a reinforcing bar for prevention at a height separated from a deck plate.

Conventionally, as a spacer for bar arrangement used when constructing a synthetic slab, a spacer placed on the upper flange of a deck plate and fitted with a wire mesh (see Patent Document 1) is fitted to a mountain portion of the deck plate. (See Patent Document 2), which is a linear mounting portion provided with an inverted U-shaped leg, and is mounted on the lower flange of the deck plate along the deck direction. Those (see Patent Document 3) are known, whereas the present inventor first places them on a deck plate so that they can stand on their own stably and do not have a mountain portion like a width adjusting plate of a deck plate. We have proposed a spacer for bar arrangement that can be arranged in a place or around a pillar and that maintains a stable height simply by placing a wire mesh on the spacer for bar arrangement (Patent Document 4). reference).

Japanese Unexamined Patent Publication No. 2012-97417 Japanese Unexamined Patent Publication No. 2010-121271 Utility Model Registration No. 3028038 Patent No. 6159842

However, the deck plate of the type in which the beam portion protrudes to the upper surface resists bending of the deck plate in the deck direction due to the structure of the rising edge of the beam portion, but easily collapses when a lateral force is applied to the beam portion. Assuming that the construction worker rides on the wire mesh to work, a spacer that puts a load on the beam cannot be adopted.

For this reason, among the conventional spacers for reinforcing bars as described above, the type used by mounting on the upper flange of the deck plate cannot be mounted on the beam portion and used, and the deck plate cannot be used. Similarly, the type that is used by fitting it to the beam part of the above cannot be adopted, and in the case of a linear mounting part provided with an inverted U-shaped leg, when the spacer is arranged and when the reinforcing bar is placed. There was a problem that the spacer was extremely easy to tip over.

Further, since the spacer previously proposed by the present inventor supports the reinforcing bar mounting portion with substantially three legs, the beam portion should straddle the beam portion on the deck plate in which the beam portion protrudes high on the upper surface. There is a concern that stability will be lost if it is used by arranging it in the above.

Therefore, the present invention solves the problems of the prior art as described above, that is, the object of the present invention is a beam of a deck plate having a beam portion protruding above the upper surface of the upper flange on the lower flange. To provide a method for constructing a synthetic slab that can stably and easily position and arrange a spacer for bar arrangement on a lower flange across a portion to prevent the beam portion from being tilted by a lateral force. Is.

According to the first aspect of the present invention, the wire mesh is placed on the bottom surface of a wire mesh laid on a deck plate having a beam portion protruding above the upper surface of the upper flange radially horizontally. The first reinforcing bar mounting part, the second reinforcing bar mounting part, the third reinforcing bar mounting part and the fourth reinforcing bar mounting part, and the first reinforcing bar mounting part, the second reinforcing bar mounting part, and the third reinforcing bar mounting part. And the first rebar support leg and the second rebar support leg, the third rebar support leg, and the fourth rebar support leg that are vertically provided toward the deck plate at each distal end of the fourth rebar mounting portion. The first reinforcing bar support leg, the first reinforcing bar mounting portion, the fourth reinforcing bar mounting portion, and the fourth reinforcing bar supporting leg portion are the first reinforcing bar supporting leg portion and the first reinforcing bar. The mounting part, the fourth reinforcing bar mounting part, and the fourth reinforcing bar supporting leg part are configured in a series in the order of arrangement, and the second reinforcing bar supporting leg part, the second reinforcing bar mounting part, the third reinforcing bar mounting part, and the first The three reinforcing bar supporting legs are integrally configured in a series in the order of arrangement of the second reinforcing bar supporting leg portion, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the third reinforcing bar supporting leg portion, and the first reinforcing bar mounting portion is described. It is a method of constructing a synthetic slab using a spacer for reinforcing bars in which the placing part, the second reinforcing bar placing part, the third reinforcing bar placing part, and the fourth reinforcing bar placing part are interconnected at each proximal end. The leg length common to the first reinforcing bar support leg, the second reinforcing bar support leg, the third reinforcing bar support leg, and the fourth reinforcing bar support leg is formed to be larger than the beam height of the deck plate. The length of the long side of the virtual rectangle formed by the line connecting the first reinforcing bar support leg, the second reinforcing bar support leg, the third reinforcing bar support leg, and the fourth reinforcing bar support leg is the length of the deck plate. The length is larger than the inner dimension between the lower flanges of the first lower flange on one side of the lower flange provided with the beam portion and the second lower flange on the other side, and smaller than the outer dimension between the lower flanges. The first reinforcing bar support leg and the second reinforcing bar support leg of the reinforcing bar spacer are placed on the first lower flange on one side of the lower flange provided with the beam portion of the deck plate. The third reinforcing bar support leg and the fourth reinforcing bar support leg are placed on the second lower flange on the other side, and the reinforcing bar spacer is placed on the deck plate. The above-mentioned problems are further solved by arranging a plurality of the wire meshes at equal intervals straddling the above-mentioned ones, then placing and laying the wire mesh, and then placing concrete.

According to the method of constructing the synthetic slab according to claim 1 of the present invention, the beam portion protruding above the upper surface from the upper flange is radially horizontally arranged on the bottom surface of the wire mesh laid on the deck plate provided on the lower flange. The first reinforcing bar mounting portion, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion and the fourth reinforcing bar mounting portion, and the first reinforcing bar mounting portion and the second reinforcing bar mounting portion are placed. The first reinforcing bar support leg, the second reinforcing bar support leg, and the third reinforcing bar support leg that are vertically provided toward the deck plate at each distal end of the portion, the third reinforcing bar mounting portion, and the fourth reinforcing bar mounting portion. It is composed of a steel wire for concrete provided with a fourth reinforcing bar support leg portion, and the first reinforcing bar support leg portion, the first reinforcing bar mounting portion, the fourth reinforcing bar mounting portion, and the fourth reinforcing bar supporting leg portion are the first. Reinforcing bar support legs, first reinforcing bar mounting section, fourth reinforcing bar mounting section, fourth reinforcing bar supporting leg section are configured in a series in the order of arrangement, and the second reinforcing bar supporting leg section and the second reinforcing bar mounting section are configured. The third reinforcing bar mounting portion and the third reinforcing bar supporting leg portion are integrated in a series in the order of arrangement of the second reinforcing bar supporting leg portion, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the third reinforcing bar supporting leg portion. A spacer for reinforcing bars, which is configured and the first reinforcing bar mounting portion, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the fourth reinforcing bar mounting portion are mutually connected at each proximal end. Depending on the construction method of the synthetic slab to be used, a gate-like structure formed by the first reinforcing bar supporting leg portion, the first reinforcing bar mounting portion, the fourth reinforcing bar mounting portion, and the fourth reinforcing bar supporting leg portion, and the second The gate-shaped structure formed by the reinforcing bar support leg, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the third reinforcing bar supporting leg supports the load such as the wire mesh and four loads, respectively. Since it is dispersed in the support legs, it can exert sufficient strength even if it is composed of steel wire for concrete, and since each gate-like structure prevents each other from tipping over, it is placed on the deck plate. However, not only can it be made difficult to tip over, but also the following effects peculiar to the present invention can be obtained.

First, the leg length common to the first reinforcing bar support leg, the second reinforcing bar support leg, the third reinforcing bar support leg, and the fourth reinforcing bar support leg of the spacer for reinforcing bar is larger than the beam height of the deck plate. Due to the large formation, the first reinforcing bar mounting portion, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the fourth reinforcing bar mounting portion straddle the beam portion of the deck plate, and one of the beam portions thereof. The first reinforcing bar support leg and the second reinforcing bar support leg are placed on the lower flange on the side, and the third reinforcing bar support leg and the fourth reinforcing bar support leg are placed on the lower flange on the other side. Therefore, by using a deck plate having a beam portion protruding above the upper surface from the upper flange on the lower flange, the reinforcing bar spacer can be easily positioned and arranged across the beam portion of the deck plate, and the beam portion is oriented sideways to the beam portion. It is possible to prevent the beam from falling due to the force of the beam.

Further, the length of the long side of the virtual rectangle formed by the line connecting the first reinforcing bar support leg, the second reinforcing bar supporting leg, the third reinforcing bar supporting leg, and the fourth reinforcing bar supporting leg of the spacer for reinforcement arrangement . Is set to a length larger than the inner dimension between the lower flanges of the first lower flange on one side of the lower flange provided with the beam portion of the deck plate and the second lower flange on the other side. The first reinforcing bar support leg and the second reinforcing bar supporting leg of the spacer for reinforcement are placed on the lower flange on one side of the lower flange provided with the beam portion of the deck plate, and at the same time, the third reinforcing bar supporting leg is placed. In order to place the part and the fourth reinforcing bar support leg on the lower flange on the other side, the beam of the deck plate is used with the deck plate having the beam part protruding above the upper surface from the upper flange on the lower flange. Reinforcing spacers can be stably arranged on the lower flange across the portions.

Further, the length of the long side of the virtual rectangle formed by the line connecting the first reinforcing bar support leg, the second reinforcing bar supporting leg, the third reinforcing bar supporting leg, and the fourth reinforcing bar supporting leg of the spacer for reinforcement arrangement . Is set to a length smaller than the outer dimension between the lower flanges of the first lower flange on one side of the lower flange with the beam portion of the deck plate and the second lower flange on the other side. The first reinforcing bar support leg and the second reinforcing bar supporting leg of the spacer for reinforcement are placed on the lower flange on one side of the lower flange provided with the beam portion of the deck plate, and at the same time, the third reinforcing bar supporting leg is placed. In order to place the part and the fourth reinforcing bar support leg on the lower flange on the other side, the beam of the deck plate is used with the deck plate having the beam part protruding above the upper surface from the upper flange on the lower flange. Reinforcing spacers can be more stably arranged on the lower flange across the portions.

Then, the first reinforcing bar support leg and the second reinforcing bar support leg of the spacer for reinforcing bar are placed on the first lower flange on one side of the lower flange provided with the beam portion, and the third reinforcing bar support leg is placed. A portion and a fourth reinforcing bar support leg are placed on the second lower flange on the other side, and a plurality of reinforcing bar spacers are arranged on the deck plate at equal intervals across the beam portion, and then. By placing and laying the wire mesh, a deck plate having a beam portion protruding upward is used, and the wire mesh is used to avoid the load on the beam portion and prevent the beam portion from collapsing. Can be stably supported.

The schematic diagram of the aspect in which the spacer for bar arrangement which concerns on this invention is arranged on the deck plate, and the wire mesh is laid. The perspective view which shows the state which the spacer for bar arrangement which concerns on this invention is placed on the deck plate. A three-view view showing a spacer for bar arrangement according to the first embodiment of the present invention. Explanatory drawing which shows the dimensional relationship between the spacer for bar arrangement and a deck plate in the construction method of the synthetic slab of this invention. Explanatory drawing which shows arrangement of the spacer for bar arrangement which concerns on 1st reference example of this invention. Explanatory drawing which shows the dimensional relationship of the spacer for bar arrangement and the deck plate which concerns on the 2nd reference example of this invention. The perspective view which shows the spacer for bar arrangement which concerns on 2nd Embodiment of this invention.

The spacer for reinforcing bar according to the present invention has a gate-like structure formed by a first reinforcing bar support leg portion, a first reinforcing bar mounting portion, a third reinforcing bar mounting portion, and a third reinforcing bar support leg portion, and a second reinforcing bar. The gate-shaped structure formed by the support leg, the second reinforcing bar mounting portion, the fourth reinforcing bar mounting portion, and the fourth reinforcing bar supporting leg supports the load such as a wire mesh and supports four loads, respectively. Since it is dispersed in the legs and the gate-shaped configurations prevent each other from tipping over, even if a spacer for reinforcing bars is configured with a small diameter iron wire, it exhibits sufficient strength and is placed on the deck plate. However, any specific embodiment may be used as long as it can prevent the vehicle from tipping over.

That is, the specific shapes of the first reinforcing bar mounting portion, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the fourth reinforcing bar mounting portion adopted in the spacer for reinforcing bar according to the present invention are deck plates. As long as it is formed in a rod shape parallel to the horizontal plane of the above, it may be bent and formed into any shape including not only a straight line but also an arc shape, an S shape, and the like in a plan view.

In each case, the first reinforcing bar mounting portion, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the fourth reinforcing bar mounting portion are vertically welded toward the deck plate from the distal ends. Since the reinforcing bar support legs, the second reinforcing bar support legs, the third reinforcing bar support legs, and the fourth reinforcing bar support legs can be made to stand on their own in a so-called four-point support state, the reinforcing bar spacers fall over. It is difficult to do and has high stability.

The distance between the 1st rebar support leg and the 3rd rebar support leg and the distance between the 2nd rebar support leg and the 4th rebar support leg, that is, the dimension between the legs in the width direction is larger than the mesh size of the wire mesh WM used. As described above, if the first reinforcing bar support leg, the second reinforcing bar support leg, the third reinforcing bar support leg, and the fourth reinforcing bar support leg are formed, in a normal usage method in which a plurality of reinforcing bar spacers are arranged vertically and horizontally. , One reinforcing bar spacer supports the wire mesh WM at a plurality of places and does not fall off, so that the required cover thickness can be secured, which is preferable.

If the dimension between the legs in the width direction is set to be larger than twice the mesh dimension S of the reinforcing bar grid to be used, one reinforcing bar spacer more reliably supports the wire mesh WM at a plurality of places and falls off. Is even more preferable because it does not occur.

Regarding the specific shapes and structures of the first reinforcing bar support leg, the second reinforcing bar support leg, the third reinforcing bar support leg, and the fourth reinforcing bar support leg used in the spacer for reinforcing bar according to the present invention, the first Anything may be used as long as it is vertically installed toward the deck plate at the distal ends of the reinforcing bar mounting portion, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the fourth reinforcing bar mounting portion. do not have.

For example, the first reinforcing bar supporting leg, the second reinforcing bar supporting leg, the third reinforcing bar supporting leg, and the fourth reinforcing bar supporting leg are the first reinforcing bar mounting portion, the second reinforcing bar mounting portion, and the third reinforcing bar mounting portion. The round bar material forming the portion and the fourth reinforcing bar mounting portion may be formed by bending at a right angle at each distal end.

As shown in FIG. 4, the leg length h of the first reinforcing bar support leg, the second reinforcing bar support leg, the third reinforcing bar support leg, and the fourth reinforcing bar support leg used in the spacer for reinforcing bar according to the present invention is shown in FIG. It is preferable to form the height of the beam portion of the deck plate having the beam portion protruding upward, that is, larger than the maximum height difference H of the deck plate.

If there is such a dimensional relationship, the deck plate DP provided with the beam portion protruding above the upper surface of the upper flange UF on the lower flange DF is used, and the first reinforcing bar mounting portion of the reinforcement spacer is used. (2) Reinforcing bar mounting section, 3rd reinforcing bar mounting section and 4th reinforcing bar mounting section straddle the beam section DB of the deck plate, and one side of the lower flange DF (beam section DB and right standing) provided with the beam section DB. The first reinforcing bar support leg and the second reinforcing bar support leg are placed on the lower flange (intermediate part with the upper DR), and the other side of the lower flange DF provided with the beam portion DB (beam portion DB and left). Since the third reinforcing bar support leg and the fourth reinforcing bar support leg are placed on the lower flange (intermediate part with the rising DL), the spacer for reinforcement can be easily positioned and stably arranged. This is because it is possible to prevent the beam portion from falling due to a lateral force applied to the beam portion.

The first reinforcing bar support leg portion, the second reinforcing bar support leg portion, the third reinforcing bar support leg portion, and the fourth reinforcing bar support leg portion adopted in the spacer for reinforcing bar according to the present invention are as shown in FIGS. 3 and 4. The length of the long side of the virtual rectangle formed by the line connecting the one rebar support leg, the second rebar support leg, the third rebar support leg, and the fourth rebar support leg is the length of the long side of the deck plate. It is preferable to correspond to the distance between the flange DFs, and in particular, the inner dimension between the lower flanges of the lower flange DF on both sides of the lower flange DF provided with the beam portion DB of the deck plate DP having the beam portion DB protruding upward. It is preferably formed larger than W1. In particular, among the lengths of the long sides of such a virtual rectangle, the inner dimension L1 between the legs in the width direction connecting the points closest to each other of the reinforcing bar support legs is the beam of the deck plate as shown in FIG. It is preferable that the lower flange DF is formed larger than the inner dimension W1 between the lower flanges on both sides of the portion DB.

If there is such a dimensional relationship, each reinforcing bar support leg is the first reinforcing bar support leg using a deck plate DP provided with a beam portion DB protruding above the upper surface from the upper flange UF on the lower flange DF. And the second reinforcing bar support leg is placed on the lower flange DF on one side of the lower flange DF provided with the beam portion DB of the deck plate (the intermediate portion between the beam portion DB and the right rising upper DR). The third reinforcing bar support leg and the fourth reinforcing bar support leg are placed on the lower flange DF on the other side of the lower flange DF provided with the beam portion DB (the intermediate portion between the beam portion DB and the left rising upper DL). This is because the first reinforcing bar mounting section, the second reinforcing bar mounting section, the third reinforcing bar mounting section, and the fourth reinforcing bar mounting section can be stably arranged across the beam portion DB of the deck plate DP. be.

Further, the first reinforcing bar support leg portion, the second reinforcing bar support leg portion, the third reinforcing bar support leg portion, and the fourth reinforcing bar support leg portion adopted in the spacer for reinforcing bar according to the present invention are the first as shown in FIG. The length of the long side of the virtual rectangle formed by the line connecting the reinforcing bar support leg, the second reinforcing bar support leg, the third reinforcing bar support leg, and the fourth reinforcing bar support leg is the length of the multiple lower flanges of the deck plate. It is preferable to correspond to the distance between the DFs, and in particular, the outer dimensions between the lower flanges of the two lower flanges on both sides of the lower flange DF having the beam portion DB of the deck plate DP having the beam portion DB protruding upward. It is preferably formed smaller than W2. In particular, among the lengths of the long sides of such a virtual rectangle, the outer dimension L2 between the legs in the width direction connecting the points farthest from each other of the reinforcing bar support legs is the beam portion DB as shown in FIG. It is preferably formed smaller than the outer dimension W2 between the lower flanges of the two lower flange DFs on both sides.

If there is such a dimensional relationship, the first reinforcing bar support leg and the second reinforcing bar support leg are used by using the deck plate DP provided with the beam portion DB protruding above the upper surface of the upper flange UF on the lower flange DF. The portion was placed on the lower flange DF on one side of the lower flange DF provided with the beam portion DB of the deck plate DP, and the third reinforcing bar support leg portion and the fourth reinforcing bar supporting leg portion were provided with the beam portion DB. This is because it can be placed on the lower flange DF on the other side of the lower flange DF and stably arranged across the beam portion DB of the deck plate DP.

As the material constituting the spacer for bar arrangement according to the present invention , the iron wire constituting the wire mesh WM, for example, SWM-P, SWM-C, SWM-R or SWM- defined in Japanese Industrial Standard JIS G3532 "iron wire". Iron wires for concrete conforming to I can be used, and these are generally preferable because the mechanical properties can be confirmed and proved by a mill sheet. Further, round steel or deformed reinforcing bars may be used.

As the reinforcing bar for preventing the expansion of cracks supported by the spacer for reinforcing bar according to the present invention , a welded wire mesh or a reinforcing bar lattice, that is, a plurality of reinforcing bars or reinforcing bars arranged in a grid pattern in the vertical and horizontal directions in advance, spot welding or fastening with wires, etc. A so-called unit rebar or wire mesh that is integrated with each other is preferable, but a plurality of rebars may be directly assembled in a grid pattern or the like at the construction site. In this patent specification, the wire mesh WM is used as a representative of these.

As the wire mesh WM supported by the spacer for bar arrangement according to the present invention, those having a mesh size S of 50 mm, 75 mm, 100 mm, 150 mm, 200 mm, 250 mm or 300 mm can be used, but the present invention is not limited thereto.

When constructing a synthetic slab using the reinforcement spacers according to the present invention , a plurality of reinforcement spacers are arranged on the deck plate at substantially regular intervals. This interval is preferably an integral multiple of the mesh size S, and is usually about 3 to 5 times, but it is arbitrary as long as the required cover thickness can be secured even if the reinforcing bar bends during this interval. Can be arranged at intervals of.

Hereinafter, the spacer for bar arrangement according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.

Here, FIG. 1 is a schematic view of an embodiment in which the reinforcement spacer according to the present invention is arranged on the deck plate and a wire mesh is laid, and FIG. 2 shows the reinforcement spacer according to the present invention mounted on the deck plate. A perspective view showing a placed state, FIG. 3 is a three-view view showing a reinforcement spacer according to the first embodiment of the present invention, and FIG. 4 shows a reinforcement spacer and a deck plate in the method of constructing the synthetic slab of the present invention. It is explanatory drawing which shows the dimensional relation of.

In the reinforcement spacer 100 according to the present embodiment, as shown in FIG. 1, a plurality of reinforcement spacers 100 are arranged on the upper surface of the deck plate at intervals of, for example, 800 mm, and further, the first reinforcing bar mounting portion 111 and the second reinforcing bar are placed. By placing the wire mesh WM on the reinforcing bar mounting portion 112, when placing concrete for constructing a synthetic slab, it is decided to secure the height from the deck plate and lay the wire mesh WM. It is to be used.

More specifically, the reinforcement spacer 100 according to the present embodiment is made of steel, and is configured by bending a concrete iron wire having a diameter of 6 mm as shown in FIGS. 2 and 3. ..

The first reinforcing bar mounting portion 111, the second reinforcing bar mounting portion 112, the third reinforcing bar mounting portion 113, and the fourth reinforcing bar mounting portion 114 are arranged horizontally in a radial pattern, and further, with the first reinforcing bar mounting portion 111. The second reinforcing bar mounting portion 112, the third reinforcing bar mounting portion 113, and the fourth reinforcing bar mounting portion 114 are arranged and configured at the same height, and the proximal end 111b of the first reinforcing bar mounting portion 111, The proximal end 112b of the second reinforcing bar mounting portion 112, the proximal end 113b of the third reinforcing bar mounting portion 113, and the proximal end 114b of the fourth reinforcing bar mounting portion 114 are mutually coupled to form the connecting portion C. ing.

Further, the first reinforcing bar support leg 121 is vertically hung from the distal end 111a of the first reinforcing bar mounting portion 111 toward the deck plate DP, and the second reinforcing bar is supported from the distal end 112a of the second reinforcing bar mounting portion 112. The leg portion 122 is vertically suspended toward the deck plate DP, and the third reinforcing bar support leg portion 123 is vertically suspended toward the deck plate DP from the distal end 113a of the third reinforcing bar mounting portion 113, and the fourth reinforcing bar is placed. The fourth reinforcing bar support leg portion 124 is vertically suspended from the distal end 114a of the portion 114 toward the deck plate DP.

The leg length h of the first reinforcing bar supporting leg portion 121, the second reinforcing bar supporting leg portion 122, the third reinforcing bar supporting leg portion 123, and the fourth reinforcing bar supporting leg portion 124 is 95 mm, that is, the second reinforcing bar supporting leg portion. The leg length h common to 122, the third reinforcing bar support leg 123 and the fourth reinforcing bar 124 is 95 mm, and the first reinforcing bar mounting portion 111 and the second reinforcing bar mounting are linearly configured, respectively. The lengths of the placement portion 112, the third reinforcing bar mounting portion 113, and the fourth reinforcing bar mounting portion 114 are 125 mm, respectively. The first reinforcing bar mounting portion and the fourth reinforcing bar mounting portion are arranged and configured in a straight line, and the second reinforcing bar mounting portion and the third reinforcing bar mounting portion are arranged and configured in a straight line.

The length of the long side of the virtual rectangle formed by the line connecting the first reinforcing bar supporting leg portion 121, the second reinforcing bar supporting leg portion 122, the third reinforcing bar supporting leg portion 123, and the fourth reinforcing bar supporting leg portion 124, that is, the first Of the distance between the one reinforcing bar support leg 121 and the third reinforcing leg 123, and the distance between the second reinforcing leg 122 and the fourth reinforcing leg 124, the mutual reinforcement support legs The widthwise leg-to-leg inside dimension L1 connecting the closest points is 200 mm, and the width-wise leg-to-leg outside dimension L2 connecting the farthest points from each other of the reinforcing bar support legs is 206 mm.

Hereinafter, a procedure for constructing a synthetic slab using the reinforcement spacer 100 according to the present embodiment will be described.

The deck plate DP used in this embodiment is called a Sinos deck (registered trademark), and its dimensions are the height of the beam portion DB supported by the beam support portion DS, that is, the maximum height of the deck plate. Difference H = 90 (mm), width between right rising DR and left rising DL = 400 (mm), display thickness = 1.0 (mm) or 1.2 (mm) or 1.6 (mm) , The width between the insides of the first lower flange DF and the second lower flange DF on both sides of the beam portion DB, that is, the inner dimension W1 = 156 (mm) between the lower flanges, the first on both sides of the beam portion DB. The width between the outer sides of the lower flange DF and the second lower flange DF, that is, the outer dimension W2 = 243 (mm) between the lower flanges.

Therefore, the deck plate DP has a configuration in which the lower flange DF is provided with a beam portion DB protruding above the upper surface of the upper flange UF.
In the construction of the synthetic slab, first, as the deck plate construction, the deck plate DP is carried to the construction site, laid, joined with the beam, closed at the edge, etc., and then the reinforcement work is performed.

In the bar arrangement work, as shown in FIG. 1, the bar arrangement spacers 100 according to the present embodiment are arranged at intervals of 800 mm so as to straddle the beam portion DB of the deck plate DP, and are arranged at appropriate intervals in the width direction. As a result, the reinforcement spacer 100 is arranged. At this time, as shown in FIG. 4, the first reinforcing bar support leg portion 121 and the second reinforcing bar support leg portion 122 are attached to the first lower flange DF on one side of the lower flange DF provided with the beam portion DB of the deck plate. The third reinforcing bar support leg 123 and the fourth reinforcing bar support leg 124 are mounted on the second lower flange DF on the other side of the lower flange DF provided with the beam portion DB, and the first reinforcing bar is mounted. The placing portion 111, the second reinforcing bar mounting portion 112, the third reinforcing bar mounting portion 113, and the fourth reinforcing bar mounting portion 114 are stably arranged so as to straddle the beam portion DB of the deck plate DP.

After that, a wire mesh WM made of round steel having a diameter of 6 (mm) and having a mesh size of S = 150 (mm) is laid on the reinforcing spacers 100 arranged at equal intervals with a stacking length of 300 mm. Process the joint part. As a result, the bar arrangement spacer 100 is arranged on the bottom surface of the wire mesh WM.

Concrete work will be carried out after bar arrangement work. As concrete work, concrete is poured and cured to form a concrete layer RC, and a synthetic slab is completed.
[Reference Example 1]

Next, as a first reference example of the present invention, another construction method using the reinforcement spacer 100 will be described with reference to FIG. FIG. 5 is an explanatory diagram showing the arrangement of the bar arrangement spacer 100 according to the first reference example of the present invention.

In this reference example , L1 = 150 (mm) and L2 = 156 (mm) are configured, and the reinforcing bar spacer 100 is located between the adjacent beam portions DB so as not to straddle the beam portion DB. The first reinforcing bar support leg 121 and the second reinforcing bar support leg 122 are placed on the lower flange DF, and the third reinforcing bar support leg 123 and the fourth reinforcing bar support leg 124 are placed on the second lower flange DF. As in the case of the first embodiment, the reinforcing bar spacer 100 is configured and the concrete work is performed except that the above is placed.
[Reference Example 2]

Next, as a second reference example of the present invention, another construction method using the reinforcement spacer 100 will be described with reference to FIG. FIG. 6 is an explanatory diagram showing the dimensional relationship between the bar arrangement spacer 100 and the deck plate DP according to the second reference example of the present invention.

The deck plate DP used in this reference example is a so-called wide groove type 50 that does not have a beam portion protruding upward, and its dimensions are the height of the mountain portion, that is, the maximum height of the deck plate. Difference H = 50 (mm), unit width B = 300 (mm), groove bottom dimension b = 125 (mm), display thickness t = 1.2 (mm), mountain width, that is, inner dimension between lower flanges W1 = It is 175 (mm).

Further, the bar arrangement spacer 100 used in this reference example has the same configuration as that of the first embodiment except that L1 = 210 (mm) and L2 = 216 (mm).

In this reference example , the first reinforcing bar support leg 121 and the second reinforcing bar support leg 122 are placed on the first lower flange DF adjacent to one side of the mountain portion PP of the deck plate to support the third reinforcing bar. The leg portion 123 and the fourth reinforcing bar support leg portion 124 are placed on the second lower flange DF adjacent to the other side of the mountain portion PP, and the first reinforcing bar mounting portion 111, the second reinforcing bar mounting portion 112, and the second Concrete work is carried out in the same manner as in Example 1 except that the three reinforcing bar mounting portions 113 and the fourth reinforcing bar mounting portion 114 are stably arranged so as to straddle the mountain portion PP of the deck plate DP.

Hereinafter, the reinforcing spacer 100'according to the second embodiment of the present invention is based on FIG. 7.
I will explain. FIG. 7 is a perspective view showing a reinforcement spacer 100'according to the second embodiment of the present invention.
be.

The reinforcement spacer 100'according to the present embodiment has a specific mode of connection at the joint portion C'.
Except for the difference, the spacer 100 for bar arrangement according to the first embodiment is configured in the same manner.
In this embodiment, the height of the first reinforcing bar mounting portion 111'and the fourth reinforcing bar mounting portion 114'are the same.
The second reinforcing bar mounting portion 112'and the third reinforcing bar mounting portion 113' are arranged and configured linearly at the same height, and further, the first reinforcing bar support leg is arranged and configured. The portion 121', the first reinforcing bar mounting portion 111', the fourth reinforcing bar mounting portion 114', and the fourth reinforcing bar supporting leg portion 124'are integrally formed in a series in this arrangement order to form a U-shape. Further, the second reinforcing bar supporting leg portion 122, the second reinforcing bar mounting portion 112', the third reinforcing bar mounting portion 113', and the third reinforcing bar supporting leg portion 123'are configured in a series in this arrangement order. A U-shaped structure is formed, and these two U-shaped configurations are arranged and welded in a cross shape that overlaps vertically at the joint portion C'.
With such a configuration, a spacer 100'for bar arrangement can be manufactured at low cost, and the spacer for bar arrangement can be manufactured.
Concrete work was carried out using the pacer 100', and almost the same effect as in the case of Example 1 was obtained.
Can be

As described above, according to the method of constructing the synthetic slab of the present invention, a deck plate having a beam portion protruding upward is used, and the first lower flange on one side of the lower flange provided with the beam portion is used. The first rebar support leg and the second rebar support leg are placed on the second rebar support leg, and the third rebar support leg and the fourth rebar support are placed on the second lower flange on the other side of the lower flange provided with the beam portion. A gate-like structure formed by the first reinforcing bar supporting leg, the first reinforcing bar mounting portion, the fourth reinforcing bar mounting portion, and the fourth reinforcing bar supporting leg portion by mounting the leg portion, and the second reinforcing bar support. The gate-shaped structure formed by the legs, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the third reinforcing bar supporting leg supports the load such as the wire mesh and the four supporting legs, respectively. Since it is dispersed in the parts and each gate-like structure prevents each other from tipping over, it exhibits sufficient strength even if it is made of iron wire for concrete, and it is placed on the deck plate across the beam part. However, it does not easily tip over, avoids the load on the beam, and can stably support the wire mesh.

100 ・ ・ ・ ・ ・ Spacer for reinforcing bar 111 ・ ・ ・ ・ ・ First reinforcing bar mounting part 111a ・ ・ ・ ・ ・ ・ Disdistant end 111b of the first reinforcing bar mounting part ・ ・ ・ ・Position end 112 ... Second rebar mounting portion 112a ... Distal end 112b of the second rebar mounting portion ..... Proximal end of the second rebar mounting portion 113 ... Third reinforcing bar mounting portion 113a ... Distal end of third reinforcing bar mounting portion 113b ..... Proximal end of third reinforcing bar mounting portion 114 ... Fourth reinforcing bar mounting portion 114a ...・ ・ ・ Distal end 114b of the 4th reinforcing bar mounting part ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Leg 123 ・ ・ ・ ・ ・ Third rebar support leg 124 ・ ・ ・ ・ ・ Fourth rebar support leg C ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・····················································································································································· Lower flange DB ・ ・ ・ ・ ・ ・ Beam DS ・ ・ ・ ・ ・ ・ Beam support DR ・ ・ ・ ・ ・ ・ Right standing upper part DL ・ ・ ・ ・ ・ ・ Left standing upper part W1 ・ ・ ・ ・ ・ ・ Lower flange Inner dimension W2 ・ ・ ・ ・ ・ ・ Outer dimension between lower flange H ・ ・ ・ ・ ・ ・ Maximum height difference of deck plate (beam height, mountain height)
WM ・ ・ ・ ・ ・ ・ Wire mesh S ・ ・ ・ ・ ・ ・ ・ Mesh size RC ・ ・ ・ ・ ・ ・ Concrete layer B ・ ・ ・ ・ ・ ・ Unit width b ・ ・ ・ ・ ・ ・ ・ Groove bottom size PP・ ・ ・ ・ ・ ・ Yamabe

Claims (1)

The first reinforcing bar mounting portion, the second, in which the beam portion protruding above the upper flange is radially horizontally arranged on the bottom surface of the wire mesh laid on the deck plate provided on the lower flange, and the wire mesh is placed. Reinforcing bar mounting section, third reinforcing bar mounting section and fourth reinforcing bar mounting section, and the first reinforcing bar mounting section, second reinforcing bar mounting section, third reinforcing bar mounting section and fourth reinforcing bar mounting section. It consists of a steel wire for concrete having a first reinforcing bar support leg and a second reinforcing bar support leg, a third reinforcing bar support leg, and a fourth reinforcing bar support leg that hang down toward the deck plate at the distal end. The first reinforcing bar support leg portion, the first reinforcing bar mounting portion, the fourth reinforcing bar mounting portion, and the fourth reinforcing bar supporting leg portion are the first reinforcing bar supporting leg portion, the first reinforcing bar mounting portion, and the fourth reinforcing bar mounting portion. The second reinforcing bar support leg, the second reinforcing bar mounting portion, the third reinforcing bar mounting portion, and the third reinforcing bar supporting leg portion are integrally configured in a series in the order of arrangement of the portion and the fourth reinforcing bar support leg portion. The two reinforcing bar support legs, the second reinforcing bar mounting section, the third reinforcing bar mounting section, and the third reinforcing bar supporting leg section are configured in a series in the order of arrangement, and the first reinforcing bar mounting section and the second reinforcing bar mounting section are integrally configured. This is a method of constructing a synthetic slab using a spacer for reinforcing bars in which the third reinforcing bar mounting portion and the fourth reinforcing bar mounting portion are interconnected at each proximal end.
The leg length common to the first reinforcing bar support leg, the second reinforcing bar support leg, the third reinforcing bar support leg, and the fourth reinforcing bar support leg is formed to be larger than the beam height of the deck plate.
The length of the long side of the virtual rectangle formed by the line connecting the first reinforcing bar support leg, the second reinforcing bar supporting leg, the third reinforcing bar supporting leg, and the fourth reinforcing bar supporting leg is the length of the long side of the deck plate. The length is larger than the inner dimension between the lower flanges of the first lower flange on one side of the lower flange provided with the beam and the second lower flange on the other side, and smaller than the outer dimension between the lower flanges. It has been set and
The first reinforcing bar support leg and the second reinforcing bar support leg of the reinforcing bar spacer are placed on the first lower flange on one side of the lower flange provided with the beam portion of the deck plate, and the second reinforcing bar is placed on the first lower flange. The third reinforcing bar support leg and the fourth reinforcing bar support leg are placed on the second lower flange on the other side, and the reinforcing bar spacer is placed on the deck plate at equal intervals across the beam portion. Multiple arrangements,
After that, the wire mesh was placed and laid,
Next, a method for constructing a synthetic slab, which comprises placing concrete.

Images