JP3008387U - Welded wire mesh for reinforced concrete - Google Patents

Abstract

(57) [Abstract] [Purpose] When constructing a reinforcing bar concrete structure, the present invention can connect the wire mesh A in a flat state without lifting, and keep the height of the wire mesh (A) constant. Can hold
Especially, even if four wire meshes (A) are overlapped, they can be connected in a substantially flat state, so that the cover thickness can be kept constant, the concrete strength is almost the same as the calculated value, and quality control is easy. Becomes In addition, the number of workers when placing concrete can be reduced. Moreover, weight reduction and cost reduction are possible. [Structure] Below a wire net A, which is arranged and welded in a grid by main bars 1 and distribution bars 2, wave bars 3 are arranged along a predetermined number of main bars 1 and the peak portions thereof are the main bars. 1 is fixed to the intersection of the distribution muscle 2 and one end of the main mesh 1 and the distribution muscle 2 of the wire net A is provided with connecting portions 11 and 21 extending longer than the pitch p of the lattice. Make up with structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cost-reducing type welded wire mesh for a reinforcing bar concrete, which holds a wire mesh at a certain height from a deck plate or the like when forming a reinforcing bar concrete structure to ensure a constant cover thickness. .

[0002]

[Prior art]

 FIG. 7 is a view showing a state of overlapping portions of a conventional welded wire netting. In the structure of the welded wire netting (A), round bars are arranged vertically and horizontally at a predetermined interval to form a lattice shape, which are welded and fixed. Further, by sequentially arranging the wire nets (A), as shown in FIG. 8, a stacking margin has a three-sheet overlapping part as shown by a hatched portion in FIG. 8, and the wire nets (A) are lifted to raise the deck plate (4). It is the current situation that a certain height cannot be secured from). As a construction method for ensuring a constant cover thickness, a spacer (5) for holding the wire mesh (A) at a predetermined height from the deck plate (4) is generally used. The structure of this spacer (5) is made of dice-shaped wood chips or concrete blocks, or made of steel or plastic that supports legs, or metal. Many types of rods are generally used, such as a rod bent and welded to a base plate. When this was used, it was placed under the mesh of the wire mesh (A) and supported it.

[0003]

[Problems to be solved by the device]

 However, in the arrangement of the welded wire netting (A), a two-sheet overlapping section to a four-sheet overlapping section occurs depending on the overlapping margin. For this reason, the metal mesh (A) is supported by a low spacer (5) in consideration of the amount of lifting of the metal mesh (A). As a result, the depth of fogging becomes thicker, and there is a risk of lowering the strength, and the diameter of the round bar of the wire netting (A) must be increased or the number of wires must be increased, resulting in an increase in cost. In some cases, in order to prevent the strength from deteriorating, the overlapping part is decided based on the covering depth of the two-ply overlapping part, and the lifting amount of the three-ply overlapping part and the four-ply overlapping part is forcibly pressed from above. There is also. In this case, skill and labor are required.

Further, when arranging the spacers (5), if the number of the spacers (5) to be arranged is increased, it takes time and cost. Moreover, increasing the overall size of the spacer (5) to improve stability affects the strength of the concrete, so the spacer (5) is made smaller, and as a result, the spacer (5) is a wire mesh. It was easy to come off from (A). Particularly, when the concrete is cast, the spacer (5) is disengaged from the mesh of the wire mesh (A) by the force of the concrete to flow out, and the wire mesh (A) contacts the deck plate (4). However, if it is partially slackened or lowered, the cover thickness may fluctuate and there may be a portion where the predetermined height cannot be secured. Then, the strength of the slab was sharply reduced, and cracks, which were the largest cause of the deterioration of floor strength, were occurring. Furthermore, the number of workers required for placing concrete is two to have a supply hose for the concrete, and a spacer (5) out of the mesh of the wire mesh (A) is required. Since 2 to 4 people are required as the personnel to return to the original position and correct or add the spacer (5) to the place where the wire mesh (A) is slack, it is always 4 to 6 people. However, there was a problem that it was difficult to secure the required number of personnel. In case of construction with a budget, a fixed planographic truss is placed on top of the deck plate (4), and concrete construction can be done immediately. This has drawbacks such as high price and large-scale transportation and placement work. However, the adjacent comrades where the three-dimensional trusses are placed have no overlap margin, so cracks were likely to occur in this adjacent part.

Since the present invention does not lift up due to overlapping of wire mesh, the wire mesh can be held at a certain height from a deck plate or the like to ensure a constant cover thickness and reduce the number of workers. It is an object to provide a down-type welded wire mesh for reinforced concrete.

[0006]

[Means for Solving the Problems]

 The present invention has been made in order to solve the above-mentioned problems, that is, one end of each main bar and one end of each distribution bar of the wire mesh arranged and welded in a grid by the main bar and the distribution bar. The structure is such that a connecting portion extending longer than the pitch of the grid is provided. Further, below the above-mentioned wire mesh, wave reinforcements are arranged along a predetermined number of main reinforcements, and the mountain portions thereof are fixed to the intersections of the main reinforcements and the distribution muscles.

[0007]

[Action]

 Next, a method of using the present invention will be described. First, the case where the present invention is connected in the left-right direction will be described. The wire mesh (A) is placed on the right side in advance so that the connecting portion (21) extends to the left end. Also, prepare a wire mesh (A ') near the connecting portion (21) [see Fig. 4 (a)]. Then, the right end of the wire netting (A ') is placed on the connecting part (21) of the wire netting (A) and connected. At this time, the force distribution muscles (2 ′) of the wire mesh (A ′) are superposed on the connecting portion (21). Positioning is completed when the overlapping force distribution muscle (2) at the left end of the wire mesh (A) becomes approximately the same width as the force distribution muscle (2 ′) at the right end of the wire mesh (A ′). Then, the wire meshes (A) and (A ') on the left and right are connected in a flat state without being lifted [see FIG. 4 (b)]. Next, the case where the device of the present invention is connected in the front-rear direction will be described. First, the wire mesh (A) is arranged so that the connecting portion (11) extends at the front end. Then, a wire mesh (A ′) is prepared near the connecting portion (11) [see FIG. 5 (a)]. Next, the wire mesh (A ') is placed on the rear wire mesh (A) and connected. At this time, the main bar (1 ') of the wire mesh (A') is overlaid on the connecting portion (11). Positioning is performed when the distance between the main bars (1) at the front end of the overlapped wire mesh (A) and the main bars (1 ') at the rear end of the wire mesh (A') is appropriately narrower than the pitch (p) of the grid. Complete. As a result, the front and rear wire meshes (A) and (A ') are connected in a flat state without being lifted [see FIG. 5 (b)]. Further, if the product of the present invention has a four-sheet stacking portion that is connected in four directions, front, back, left, and right, by connecting either the left or right or the front and back first, and then connecting the rest in sequence, as described above. It can be connected in a flat state without raising the four-layered part of the front, rear, left and right wire mesh (A) (see Fig. 6).

The direction is selected in advance so that the troughs of the wave streaks (3) can be stably placed on the convex portions of the deck plate (4), and the wire mesh (A) is placed on the deck plate (4). After placing all the wire mesh (A) on the deck plate (4) by placing it on the deck), concrete casting is performed. At this time, since the wave stirrup (3) is fixed below the wire net (A), the height of the wire net (A) is kept constant, and the wire net ( It is enough to supply the concrete from above A), and the worker who lifts the wire mesh (A) and the spacer (5) can be added or positioned under the wire mesh (A). The number of workers for making corrections can be reduced. Moreover, since the cover thickness is constant, the concrete strength substantially matches the calculated value, which facilitates quality control.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. (1) is a large number of main muscles arranged laterally and at a predetermined interval, and (2) is a large number of force distribution muscles arranged vertically. Steel bars are used for the main bars (1) and the distribution bars (2), and the main bars (1) with a width of 5000 mm and the distribution bars (2) with a length of 1825 mm as shown in FIG. It is standard to form the wire mesh (A) by arranging it in a grid pattern of the pitch (p) and welding it, but the pitch (p) is not limited to the above size. The main bars (1) and the force distribution bars (2) on one end side of the wire mesh (A) are provided with connecting portions (11) and (21) extending longer than the pitch (p) of the lattice. There is. A D-10mm round bar is used for the main reinforcement (1) and the distribution muscle (2). The connecting portion (11) of the main reinforcement (1) has a length of 365mm, and the distribution muscle (2) described above is used. The length of the connecting portion (21) is preferably 450 mm, but it is sufficient if the connecting portion (21) is extended longer than the pitch (p). The diameter of the round bar is not limited to the above size, but is determined according to the usage conditions. (3) is a wave bar of a steel round bar which is arranged and fixed below the wire mesh (A), and the mountain portion of the wave bar (3) has a main bar (1) and a distribution bar. It is arranged and fixed at the intersection of (2) and along the main bar (1). As a method of fixing the wave muscle (3), there are a case where it is fixed to the side surface of the main bar (1) [see FIG. 3 (a)] and a case where it is fixed to the lower surface of the main bar (1). 3 (b)]. The wave muscles (3) serve as legs for supporting the wire netting (A) at a predetermined height. The wave muscles (3) may be fixed to the force distribution muscles (2) instead of the main muscles (1), and are arranged only in one direction.

[0010]

EFFECTS OF THE INVENTION The present invention has the following effects by being configured in this way.

As described in claim 1, the wire mesh (A) extends to one end side of each main bar (1) and each distribution bar (2) longer than the pitch (p) of the grid of the wire mesh (A). By providing the connecting portions (11) and (21) for connecting, the wire mesh (A) can be connected in a flat state without being lifted up, and the height of the wire mesh (A) can be kept constant. In particular, even if four wire meshes (A) are overlapped, they can be connected in a substantially flat state, so that the cover thickness can be kept constant, the concrete strength is almost the same as the calculated value, and quality control is easy. Becomes

As described in claim 2, the length of the connecting portions (11) and (21) of the main muscle (1) and the force distributing muscle (2) is set to 300 mm plus α, so that the overlapping portion is more reliable. The strength can be secured, and moreover, there is no lifting of the overlapping part, and a substantially flat connection is possible.

According to the third aspect of the present invention, the wave plate (3) is arranged and fixed below the wire netting (A) so that a fixed height can be maintained, so that the deck plate (4) is formed. The wire mesh (A) can be held at a constant height from the above. In addition, it is possible to reduce the number of workers when placing concrete, and the labor-intensive work that is required in the past is no longer required, making it easy to secure personnel. Moreover, the spacer (5) is not necessary, and by stably supporting the wire mesh (A), the fogging depth becomes more stable. Therefore, there is no fear of a decrease in strength as in the prior art, and there is no need to increase the diameter of the round bar of the wire netting (A) or increase the number of wires, which has been done conventionally, so that the cost does not increase. Moreover, it does not require the conventional skill and labor. Furthermore, since no expensive space truss like the conventional one is used, it is easy to carry and place, and there is no fear of cracking the adjacent parts where the space truss is placed.

According to a fourth aspect, the mountain portion of the wave muscle (3) is arranged and fixed at the intersection of the main muscle (1) and the distribution muscle (2) and along the main muscle (1). As a result, the wire mesh (A) can be reliably held at a predetermined height from the deck plate (4) and the covering thickness can be kept constant. Further, since the wave streak (3) of the present invention fits exactly in the mesh of the wire mesh (A), the bulkiness is reduced by stacking it, and transportation and storage can be efficiently performed.

By arranging and fixing the wave streaks (3) for every predetermined number as described in claim 5, it is possible to reduce the weight and the cost.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing a main structure of an embodiment of the present invention.

FIG. 3 is an explanatory view showing a fixed state of wave muscles in the present embodiment.

FIG. 4 is an explanatory view showing a state in which the product of the present invention is connected left and right.

FIG. 5 is an explanatory view showing a state in which the device of the present invention is connected to the front and rear.

FIG. 6 is a cross-sectional view showing a state of the overlapping portion of the welding wire mesh of the present invention.

FIG. 7 is a cross-sectional view showing a state of an overlapping portion of a conventional welding wire mesh.

FIG. 8 is an explanatory diagram showing an arrangement state of welding wire nets.

[Explanation of symbols]

 A Wire mesh 1 Main bar 2 Distribution bar 11,21 Connection part 3 Wave bar p Pitch

Claims (5)

[Scope of utility model registration request] 1. In a wire mesh (A) arranged and welded in a grid by a main bar (1) and a force distribution bar (2), one end side of each of the main bars (1) and each force distribution bar (2). The welding wire mesh for reinforcing bar concrete is characterized in that connecting portions (11), (21) extending longer than the pitch (p) of the grid are provided in the. 2. The welded wire mesh for reinforcing bar concrete according to claim 1, wherein the length of the connecting portions (11), (21) of the main bar (1) and the force distributing bar (2) is 300 mm plus α. 3. The wave stirrer (3) for maintaining the height of the wire mesh (A) is arranged and fixed below the wire mesh (A). Welded wire mesh for reinforced concrete. 4. The crest portion of the wave muscle (3) is an intersection of the main muscle (1) and the force distributing muscle (2) and the main muscle (1).
The welded wire mesh for reinforcing bar concrete according to claim 3, wherein the welded wire mesh is arranged along and fixed. 5. The reinforcing bar concrete according to claim 3 or 4, wherein the arrangement of the wave muscles (3) is fixed every predetermined number.
Welded wire mesh for g.