JPH03144049A - Reinforcing bar spacer for concreting - Google Patents

Abstract

PURPOSE:To facilitate mounting and to improve the strength of concrete by a method wherein a plurality of spacer member formed by bending or curving wires are joined together to form a cageform spacer, and a welded wire net is laid thereover. CONSTITUTION:A plurality of spacer members 8... where wires are bent or curved to form support parts 11 on support parts 12 and 12 are arranged with a distance between the adjoining spacer members. The spacer members are integrally intercoupled through a plurality of coupling wires 9... to form cageform reinforcing bar spacers 7.... A plurality of the reinforcing bar spacers 7... are longitudinally arranged on crushed stones 4, connection parts therebetween are bound by using binding wires to arrange the spacers in a linear state. The reinforcing bar spacers 7... are arranged, in order, laterally at intervals. Welded wire nets 5 are then laid over the spacers 7... and after the welded wire nets are supported at a given height by means of the support parts 11 being the upper parts of the spacers 7..., concrete 6 is placed.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a reinforced concrete spacer for concrete placement, which is used when constructing the floor surface of a reinforced concrete building, and which ensures the fog thickness of the concrete above the welded wire mesh. be.

(Conventional technology) Generally, when constructing the floor surface of a reinforced concrete building, the tensile strength of the concrete is improved by covering the top of a welded wire mesh, which serves as reinforcing bars, with concrete to a predetermined thickness and embedding the reinforcing bars in predetermined positions. However, the coating thickness from the welded wire mesh to the concrete surface is called the fog thickness.

In the conventional construction method, a spacer l as shown in FIG. 11, for example, is used to ensure an appropriate fog thickness.

This spacer 1 combines three leg plates 2 in a figure 7 shape,
The receiver is integrally molded with plastic and has a groove 3 in its upper part.

The method of using this spacer 1 is as shown in FIG. 12, for example, when constructing an earthen floor floor, crushed stones 4 are first laid down and then tamped to flatten the surface.

After this, weld metal M4 made by welding wires and round bars in a grid pattern.
5 is spread, and spacers 1 of a predetermined height are sandwiched under this at appropriate intervals and supported by receivers rR3 to ensure the fog thickness d.

After undergoing an inspection in this state, concrete 6 is poured. In this pouring work, the worker walks on the welded wire mesh 5 while working, so the welded wire mesh 5 often bends and the spacer 1 supported falls over and comes off as shown in FIG. 13.

As a result, the welded wire mesh 5 sinks, but the concrete 6 must be poured in a short time before it hardens, so the concrete 6 is actually poured without any modification. Designed strength could not be achieved.

In addition, since the welded wire mesh 5 is poured, the gap between it and the crushed stone 4 becomes narrow, and the flow of the concrete 6 becomes poor, resulting in the problem that the concrete 6 does not flow sufficiently, and the pouring work takes a long time.

Further, since the spacer 1 is used on the order of several hundred sides, although it varies depending on the size, it takes time and effort to install the spacer 1, and since it is made of plastic, it is not desirable in terms of strength if it is buried in the concrete 6.

(Problems to be Solved by the Invention) The present invention has been devised in view of the above points, and is easy to install, can support the welded wire mesh at a predetermined height to ensure an appropriate fog thickness, and has sufficient concrete cover. Concrete pouring can be used as a scaffolding and can be used as scaffolding, greatly shortening the pouring time and improving work efficiency.Furthermore, since it is embedded in the concrete and becomes a reinforcing bar, its strength can be improved. The purpose is to provide reinforcing bar spacers for use.

(Means for Solving the Problems) The present invention provides spacer members in which a plurality of spacer members each formed by bending or curving a wire to form a supporting portion of a welded wire mesh on the upper part of a support portion are arranged at intervals, and The present invention is characterized in that each of these spacer members is integrally joined with a plurality of connecting wires to form a suitable shape.

Furthermore, the present invention may have a structure in which an opening is formed in the lower part of the spacer member and a plurality of reinforcing bar spacers can be stacked.

(Function) Next, to explain the function of the present invention, when constructing a floor surface, a plurality of reinforcing bar spacers are stacked in a longitudinal direction on top of crushed stone or a deck plate whose surface has been tamped to make the surface flat. Bind with binding wire and arrange in a straight line. Next, reinforcing bar spacers are placed one after another at intervals in the horizontal direction.

After this, a welded wire mesh made of wires and round bars welded in a lattice shape is laid on the reinforcing bar spacer and supported at a predetermined height by the upper support section.

After undergoing an inspection in this condition, concrete will be poured. In this case, the rebar spacers are spaced apart and
Because it is in good condition and has high strength, it is possible to walk on it and use it as a scaffold for pouring work.

The welded wire mesh is supported by reinforcing bar spacers to maintain its height, and because it is shaped appropriately, concrete can penetrate quickly, reducing pouring time compared to conventional methods.

When concrete is cast to a predetermined thickness in this manner, a sufficient fogging thickness is ensured and construction can be carried out as designed.

Moreover, since the reinforcing bar spacer is formed of wire in a suitable shape, it becomes a reinforcing bar itself when embedded in concrete, further improving the strength, and thus making it possible to reduce the weight of the welded wire mesh.

(Example) Hereinafter, the present invention will be described in detail with reference to an example shown in the drawings.

FIG. 1 shows an embodiment of the present invention, in which a reinforcing bar spacer 7 is made up of a plurality of spacer members 8 and 8 made of bent wires.
. . . and a connecting wire 9 .

The spacer member 8 is bent into a U-shape to open the opening 1.
0 towards the bottom, and the length of the top is e.g. 70 to 100 m.
The support part 11 is about m in length, and the height of both parts (1!
A support column 12.12 with a length of ~100+w* is provided, and a leg portion 13.13 with a length of approximately 3 [1-1-7 (1) is extended laterally at the lower end of this support portion 12, I2. A plurality of spacer members 8 are arranged at intervals of, for example, about 70 to 100 mm, and are arranged on both sides of the support portion 11 and on the leg portions 13.
Weld the connecting wire 9 to 13 to make the mesh size of the grid 7.
It is assembled to suit the size of 0 to 100+am square.

Next, how to use the reinforcing bar spacer 7 will be explained. When constructing a dirt floor, as shown in FIG. 2, crushed stones 4 are first spread and then tamped to flatten the surface.

Thereafter, a plurality of reinforcing bar spacers 7... are stacked in the longitudinal direction, and their connecting portions are bound with binding wires and arranged in a straight line. Next, reinforcing bar spacers 7 are sequentially placed at intervals of about 1 m in the lateral direction.

In this case, since the leg portion 13 and the connecting wire 9 attached thereto are provided on the lower surface, it can be stably installed without sinking into the crushed stone 4.

After this, welded wire and round bars in a grid pattern! I
i! The I5 is placed on the reinforcing bar spacer 7, supported by the upper support part 11, and supported at a predetermined height.

This work involves replacing the conventional plastic spacer 1 with 1
Compared to the method of inserting the pieces one by one, the work can be completed in about 50% of the time.

After undergoing an inspection in this state, concrete 6 is poured. In this case, the reinforcing bar spacers 7 are arranged at intervals of about 1 m, and the supporting portions 11 are wide, suitable, and strong, so that the worker can use them as a foothold and work by walking on them.

The welded wire mesh 5 is supported by the reinforcing bar spacers 7 to maintain its height, and is formed in an appropriate shape so that the concrete 6
Wetting is fast, and the casting time can be reduced by more than 30% compared to conventional methods.

By pouring the concrete 6 to a predetermined height in this manner, a sufficient fogging thickness d can be ensured and construction can be carried out as designed.

Furthermore, since the reinforcing bar spacer 7 is formed of wire in a suitable shape, it becomes a reinforcing bar itself when embedded in the concrete 6, further improving the strength, and thus making it possible to reduce the weight of the welded wire mesh 5. .

Note that since the reinforcing bar spacer 7 is manufactured from wire, the manufacturing cost is high, but since the time for installing and driving the reinforcing bar spacer 7 can be significantly shortened compared to the conventional method, it can be constructed at a low cost in terms of the overall construction cost. .

FIG. 3 shows another embodiment in which the floor surface of each floor is constructed.

(2) A deck plate 15 made of a steel plate molded into an uneven shape is placed on a beam 14 made of a shaped steel, and a reinforcing bar spacer 7 is placed on top of the deck plate 15 perpendicular to the groove 16. Thereafter, welded wire mesh 5 is placed on reinforcing bar spacer 7, and then concrete 6 is poured.

In this case, since a gap is secured above the deck plate 15 for the concrete 6 to pass around, the work can be done in a short time.

Further, since the reinforcing bar spacer 7 having the above structure has an opening 10 formed therein, it can be inverted as shown in FIG.
Since a plurality of reinforcing bar spacers 7 can be stacked on top of each other, it is not bulky and can be easily stored and transported.

5 to 10 show other embodiments of the present invention. In FIG. 5, the leg portion 13 of the spacer member 8 is omitted, and in this case, the connecting wire 9 connected to the lower end of the support portion 11 is shown. Since these serve as legs, the stone can be stably installed without sinking into the crushed stone 4.

FIG. 6 shows the spacer member 8 bent into an inverted U shape, and FIG. 7 shows the spacer member 8 bent into a chevron shape.

Since each of these structures has an opening 10 formed at the bottom, a plurality of these structures can be stacked.

Fig. 8 shows a reinforcing bar spacer 7 in which the spacer member 8 is bent into a rectangular shape to form a rectangular cage shape, and Fig. 9 shows a reinforcing bar spacer 7 in which the spacer member 8 is bent into a circular shape to form a cylindrical cage shape. Further, in FIG. 1O, the spacer member 8 is bent into a triangular shape to form a triangular cylindrical basket shape.

(Effects of the Invention) As explained above, according to the reinforcing bar spacer for concrete pouring according to the present invention, installation is easy as it only needs to be placed on crushed stone or a deck plate, and the welded wire mesh can be placed at a predetermined position. In addition to supporting the concrete at a height that ensures an appropriate fog thickness, the concrete is formed in an appropriate manner and can be rolled around quickly enough, and can also be used as scaffolding, which greatly reduces pouring time and improves work efficiency. It has various effects, such as improved strength, and since it is embedded in concrete and becomes a reinforcing bar, it can also improve strength.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a reinforcing bar spacer according to an embodiment of the present invention, and Fig. 2 shows a state in which concrete is cast using the reinforcing bar spacer of Fig. 1 to support a welded wire mesh on the floor of an earthen floor. Figure 3 is a cross-sectional view showing a state in which concrete is poured by supporting a welded wire mesh on a deck plate using the reinforcing bar spacers shown in Figure 1, and Figure 4 shows a state in which multiple reinforcing bar spacers are stacked. 5 to 10 are front views of reinforcing bar spacers showing other different embodiments,
Figure 11 is a perspective view of a conventional spacer, Figure 12 is a sectional view of a welded wire mesh supported on the floor of an earthen floor using a conventional spacer, and Figure 13 is a diagram showing concrete being poured here. It is a sectional view showing a state. 1...Spacer 3...Socket is groove 5...Welded wire mesh 7...Reinforced bar spacer 9...Connection wire 11...Support part 13...Leg part 15...Deck plate 2... ... Leg plate 4 ... Crushed stone 6 ... - Concrete 8 ... - Spacer member 0 ... Opening 2 - Support section 4 - Beam 6 ... Groove diagram Figure 13

Claims (2)

[Claims] (1) A plurality of spacer members formed by bending or curving wire to form supporting parts of welded wire mesh on the upper part of the column are arranged at intervals, and each of these spacer members is connected by a plurality of connecting wires. A reinforcing bar spacer for concrete placement characterized by being integrally joined to form a basket shape. (2) The reinforcing bar spacer for concrete casting according to claim 1, characterized in that an opening is formed in the lower part of the spacer member.