KR20010075746A - A Mesh for Preventing Cracks on Concrete Slab - Google Patents

Abstract

PURPOSE: A reinforcing screen is provided to have the excellent workability by being easily installed in a slab mold and to faithfully perform an original reinforcing function by exactly burying in a fixed position inside a slab section. CONSTITUTION: At least one spacer(15) is arranged in each dividing sections of an upper left face(10a), an upper right face(10b), a lower left face(10c) and a lower right face(10d) by sticking under widthwise reinforcing rods(11,12) or lengthwise reinforcing rods(13,14). In loading an electric box on a slab mold, the electric box is separated from the slab mold at a regular height by the spacers(15). Thereby, a worker installs a protecting screen(10) quickly. Moreover, the reinforcing screen(10) performs a reinforcing function faithfully by exactly burying inside a slab without separating from a fixed position. By supporting lower reinforcing rods with the reinforcing screen(10), the lower reinforcing rods are buried inside the slab at a coated thickness without additionally supporting the reinforcing rod.

Description

Slab for Preventing Cracks on Concrete Slabs}

The present invention relates to a slab crack prevention reinforcement network around the electrical box to reinforce the slab around the electrical box is buried to wire the indoor wire, to prevent the occurrence of cracks in the surrounding slab by the electrical box.

Slabs in buildings have been buried with electrical boxes for wiring indoor wires, and these electrical boxes are recognized as the main cause of cracks in the surrounding slabs.

That is, the slab around the electrical box has a cross-sectional defect that cannot be avoided due to the conduits piped in all directions along with the electrical box embedded in the cross section, so that the tensile stress is relatively higher than that of the slab in the area where the electrical box is not embedded. The structural strength corresponding to was weak and there was a defect easily cracking.

As shown in FIG. 1A, a pair of upper transverse reinforcing bars 110 arranged on the upper surface with a predetermined lateral spacing on the lower surface, as shown in FIG. A pair of lower surface reinforcing bars 120 are arranged with a transverse spacing, a pair of seating surface types orthogonal to the transverse reinforcing bars and arranged with a predetermined longitudinal spacing on the left surface based on the longitudinal center axis B. Slab crack prevention reinforcement mesh around the electrical box consisting of the reinforcing bars 130, a pair of right-sided longitudinal reinforcing bars 140 arranged at a predetermined longitudinal interval on the right side is known. The reinforcement net 100 reinforces the surrounding slabs 1, which are weak in structural strength with respect to tensile stress, around the electrical box 2, so that the cracks in the surrounding slabs 1 in which the electrical box 2 is embedded are embedded. It is true that it has the advantage of preventing this occurrence in advance.

However, since the conventional reinforcement net 100 does not have a structure or means for self-supporting the reinforcing net itself horizontally as shown in Figure 1b, the reinforcement net 100 on the slab formwork 3 ) Is spaced apart at a certain height, it is difficult to perform a cumbersome work to be tightly bound to the slab lower bar (4) by the binding line (5) has a problem that the work efficiency is greatly reduced.

In addition, in view of the situation that the unskilled workers are not familiar with tying the bundling line 5 in the field conditions to install the reinforcing net 100, the reinforcing net 100 to the slab lower reinforcing bar (4) Since the reinforcing net 100 is detached from the slab lower reinforcing bar 4 by the impact or vibration when the unhardened concrete is poured later, it is not easily secured in place. 1) the reinforcing net 100 is not accurately embedded in the cross section and is exposed to the floor, thereby losing the reinforcing capacity, and the rust generated by the corrosion of the reinforcing net 100 exposed to the bottom of the slab 1. There was a problem such as contaminating the slab (1).

The present invention is to provide a reinforcing net for slab crack prevention around the electrical box having excellent workability, which can be easily installed in the slab formwork with the electric box installed, so that the reinforcing net can be held horizontally at a constant height. Second, the purpose of the present invention is to provide a reinforcing net for slab crack prevention around the electric box, which is accurately embedded in the slab cross section of the surrounding electric box in which the electric box is buried.

Figure 1a is a perspective view of a conventional reinforcing net

Figure 1b is a cross-sectional view showing an embodiment of a conventional reinforcing network

Figure 2 is a perspective view of the present invention reinforcement net

Figure 3 is a cross-sectional view showing an embodiment of the present invention reinforcement network

Figure 4 is a perspective view showing the antirust cap provided on the spacer of the present invention reinforcement net

5 is a perspective view showing a reinforcing net according to a modified embodiment of the present invention

Figure 6 is a bottom perspective view showing a reinforcing net according to an embodiment of the present invention

Figure 7a is a perspective view of a reinforcing net according to another embodiment of the present invention

Figure 7b is a sectional view showing an embodiment of a reinforcing network according to another embodiment of the present invention

<Description of the symbols for the main parts of the drawings>

A: Horizontal center axis B: Vertical center axis

10a: upper left face 10b: upper right face

10c: Lower surface 10d: Lower surface

11: Top rebar 12: Bottom rebar

13: Left longitudinal rebar 14: Right longitudinal rebar

15: spacer 15a: support pillar

15b, 15c: lower and upper grooves 16: space

17: Antirust coating 18: Antirust cap

The present invention also has a pair of upper transverse rebars 11 arranged on the upper surface with a predetermined transverse spacing on the basis of the horizontal center axis A, a pair of lower transverse rebars arranged with a predetermined transverse spacing on the lower surface ( 12), a pair of left longitudinal reinforcing bars 13, orthogonally welded to the transverse rebars and disposed with a predetermined longitudinal spacing on the left surface based on the longitudinal center axis B, a predetermined longitudinal spacing on the right side In terms of a pair of right-sided longitudinal reinforcing bars (14) arranged in the same place as the conventional technology concept.

However, the slab crack prevention reinforcement net 10 around the electric box of the present invention has four upper and lower surfaces 10a, upper and lower surfaces 10b, 10c and 10c divided into horizontal and longitudinal center axes A and B. One or more spacers 15 are attached to the lower side of the transverse bars 11 and 12 or the longitudinal bars 13 and 14 for each partition surface of the lower surface 10d. It is a basic feature.

In other words, the slab crack preventing reinforcement net 10 around the electric box of the present invention has a horizontal and longitudinal center axis for each partition surface divided as horizontal and longitudinal center axes A and B, as shown in FIG. Horizontal rebars (11) (12) and longitudinal rebars (13) (14) spaced at centers

The spacers 15 are arranged at the lower part of the field so as to be supported horizontally.

Accordingly, the reinforcing net 10 of the present invention, as shown in Figure 3, when the electric box 2 is settled on the slab formwork 3 at the fixed position, the spacer 15 is arranged for every partition surface As it is held horizontally as a table and maintains a distance from the slab formwork 3 by a certain height, not only can an operator quickly and efficiently perform installation work of the reinforcement network 10, but also later to place unhardened concrete When the reinforcing network 10 is accurately embedded in the cross section of the slab (1) constructed without being separated from the position by the impact or vibration at the time, it has the advantage of faithfully performing the reinforcing function.

In addition, since the reinforcing net 10 of the present invention has a supporting function for supporting the lower reinforcing bar 4 for the slab, it is not necessary to perform the step of holding the slab lower reinforcing bar 4 as a separate spacer. In addition, the lower reinforcing bar for the slab has an additional advantage of allowing it to be embedded as a coating thickness in the cross section of the constructed slab 1.

In the embodiment of the present invention, the reinforcing net 10 is located in the inner side with respect to the horizontal center axis A, as shown in FIG. By bending the ends of the left longitudinal longitudinal reinforcing bars 13 and the right longitudinal longitudinal reinforcing bars 14, which are positioned inward with respect to the longitudinal center axis B, and are symmetric with each other, thereby forming integral spacers 15 protruding downward, One or more horizontal spacers 15 disposed on the upper and lower surfaces 10a, upper and lower surfaces 10b, lower and lower surfaces 10c, and the lower and lower surfaces 10d, respectively, divided into the horizontal and vertical center axes A and B. It is illustrated as being supported.

In addition, the reinforcing net 10 arranges a pair of upper and lower horizontal bars 11 and lower and lower horizontal bars 12 with a predetermined horizontal gap on the upper and lower surfaces based on the horizontal center axis A, and the vertical center axis B. By arranging a pair of left longitudinal longitudinal reinforcing bars 13 and right longitudinal longitudinal reinforcing bars 14 at predetermined longitudinal intervals on the left and right sides with reference to a), a space portion 16 having a predetermined size is secured in the center.

The space 16 secured to the center of the reinforcing net 10 allows the electric box 2 fixed in advance to the upper surface of the slab formwork 3 to be easily fitted, so that the electric box 2 is centered. This allows the reinforcing net 10 to be embedded in the surrounding slab (1).

In addition, the anti-corrosive paint 17 made of epoxy resin is applied to the outer surfaces of the ends of the integrated spacers 15 so that the ends of the integrated spacers 15 are exposed to the bottom surface of the slab 1 on which the ends of the integrated spacers 15 are constructed. Corrosion in the state to prevent the surrounding surface of the slab (1) rust contamination. At this time, the anti-corrosive paint 17 applied to the ends of the integrated spacer 15 is preferably not noticeable even when exposed to the bottom surface of the slab 1 using white or gray.

Here, as shown in FIG. 4, the slab 1 having an anti-corrosion cap 18 formed so as to be tightly fitted to the ends of the integrated spacers 15, and the ends of the integrated spacers 15 are constructed. Note that it may be corroded in the exposed state of the floor to prevent contamination of the surrounding slab bottom surface with rust.

Figure 5 shows a modified embodiment of the present invention, located on the outer side with respect to the horizontal center axis (A), the upper and lower transverse reinforcement (11) and the lower transverse reinforcement (12), or the longitudinal center axis (B) is formed on the outside and the center of the longitudinal longitudinal reinforcing bar 13 and the right longitudinal longitudinal reinforcing bars 14 are symmetrical to each other to form an integral spacer 15 protruding downward, so that the horizontal and vertical centers One or more spacers 15 arranged on the upper and lower surfaces 10a, upper and lower surfaces 10b, lower and lower surfaces 10c, and the lower and lower surfaces 10d respectively divided by the axes A and B are supported horizontally. will be.

This is advantageous in increasing stability when the reinforcing net 10 is placed horizontally because the spacing between the integrated spacers 15 arranged on all four sides is kept as wide as possible.

On the other hand, Figure 6 shows an embodiment of the present invention, the upper horizontal reinforcing bar 11 and the lower horizontal reinforcing bar 12 and the left longitudinal reinforcing bar 13 and the right longitudinal longitudinal reinforcing bars 14 perpendicular to each other longitudinally and horizontally The upper and lower surfaces 10a and upper and lower surfaces, which are divided as the horizontal and longitudinal center axes A and B, are joined to each other by welding a spacer 15 of an attachment type, which is erected vertically at a constant height, to the lower part of the joint portion. 10b), one or more spacers 15 are disposed on the lower surface 10c and the lower surface 10d, respectively, to be held horizontally.

This is to securely support the reinforcing net 10 as the spacer 15 of the attachment type that is welded to the junction where the transverse bars 11, 12 and the longitudinal bars 13, 14 are orthogonal to each other. There is an advantage to that.

7A and 7B illustrate another embodiment of the present invention, wherein the upper horizontal rebar 11 and the lower horizontal rebar 12 and the left longitudinal rebar 13 and the right longitudinal rebar 14 are longitudinally transverse to each other. In the lower portion of the orthogonal junction portion, by attaching the spacer 15 of the attachment type formed in a direction having a constant length and the lower and upper grooves (15b) (15c) orthogonal to each other on the top of the support pillar (15a), the horizontal and It is supported horizontally as a spacer 15 disposed at least one on the upper left surface 10a, the upper right surface 10b, the lower left surface 10c, and the lower surface 10d, which are divided as the longitudinal center axes A and B. It was to lose.

This allows the transverse bars 11, 12 and the longitudinal bars 13, 14 to be joined at right angles to the joints as a separate spacer 15 to flexibly support and support the site conditions at a relatively low price. By using the attachment-type spacer 15 that can be produced as will have the advantage that can be economically carried out the buried reinforcement network (10).

As described above, the reinforcing net of the present invention is configured to be independent of the horizontal to a certain height, so that the operator can perform the reinforcing net installation work quickly and efficiently to shorten the working time, It is buried in the slab cross section so that the reinforcing function can be faithfully performed.

Claims (7)

A pair of upper transverse rebars 11 arranged on the upper surface with a predetermined transverse interval on the horizontal center axis A, and a pair of lower transverse rebars 12 disposed on the lower surface with a predetermined transverse spacing therebetween. , A pair of left longitudinal longitudinal reinforcing bars 13, orthogonally welded to the transverse rebars and disposed with a predetermined longitudinal spacing on the left surface based on the longitudinal center axis B, and having a predetermined longitudinal spacing on the right side thereof. In consisting of a pair of right-sided longitudinal reinforcing bars 14, One or more spacers 15 for each partition surface of each of the four upper left surfaces 10a, the upper right surface 10b, the lower left surface 10c, and the lower surface 10d, which are divided as the horizontal and longitudinal center axes A and B. Slab crack prevention reinforcement net around the electrical box, characterized in that the (3) is attached to the lower portion of the transverse reinforcement (11) (12) or longitudinal reinforcement (13) (14). The slab crack prevention reinforcement net according to claim 1, wherein an anti-corrosive paint (17) made of epoxy resin is applied to the outer surfaces of the ends of the integrated spacers (15). [4] The reinforcing mesh for preventing slab cracking around an electrical box according to claim 1 or 2, further comprising an antirust cap (18) formed to be tightly fitted to the ends of the integrated spacers (15). According to claim 1, wherein the transverse reinforcing bar 11 and the lower transverse reinforcing bar (12) located in the inner side with respect to the horizontal center axis (A) symmetric with each other, or the inner side with respect to the longitudinal center axis (B) Slab crack prevention reinforcement net around the electric box, characterized in that formed by forming the spacer 15 of the protruding downward protruding by bending the ends of the left longitudinal longitudinal reinforcement (13) and the right longitudinal longitudinal reinforcement (14) symmetrical to each other . According to claim 1 or 4, wherein the transverse reinforcing bar 11 and the lower transverse reinforcing bar 12, which is located on the outside relative to the horizontal center axis (A) symmetric with each other, or the longitudinal center axis (B) Slab around the electrical box, characterized in that formed by forming an integral spacer 15 protruding downward by bending the ends of the left and right longitudinal reinforcing bars 13 and the right and vertical longitudinal reinforcing bars 14 which are symmetrical with each other and positioned on the outside with respect to each other. Reinforcement net for crack prevention. According to claim 1, wherein the upper and lower transverse reinforcement (11) and the lower transverse reinforcement (12) and the left longitudinal longitudinal reinforcement (13) and the right longitudinal reinforcing bars (14) are at a constant height below the junction portion perpendicular to each other longitudinally Slab crack prevention reinforcement net around the electric box, characterized in that by welding the vertically mounted spacer 15 of the vertical type. According to claim 1 or 6, wherein the upper and lower transverse reinforcement (11) and the lower transverse reinforcement (12) and the left longitudinal longitudinal reinforcement 13 and the right longitudinal reinforcing bars (14) in the lower portion of the junction portion perpendicular to each other longitudinally , Slab cracks around the electrical box, characterized in that by attaching the spacer 15 of the attachment type formed in a direction perpendicular to each other and the lower and upper grooves (15b, 15c) on the top of the support pillar (15a) Preventive reinforcement net.