KR930006957B1 - Bending metal lath for concrete construction - Google Patents

Abstract

The metal lathe is bent into a waved form to have ups and downs in repetition to increase sectional secondary moment to improve resistance against a large moment load. The ups and downs may have respective reinforcing bars at intervals; the wave forms may be of a square shape or a ladder shape. The lathe consists of an extended metal to present a good reinforcing for concrete construction with ease and precision.

Description

Bending metal lath for concrete structures

1 is a perspective view showing a bent metal lath of the present invention.

2 is a cross-sectional view illustrating embodiments according to shapes in which the bent metal lath of the present invention is bent.

3 is a perspective illustration showing a state in which a reinforcing material is disposed in the bent metal lath of the present invention.

Figure 4 (a) (b) (c) is a cross-sectional view showing an embodiment according to the state that the reinforcing material is disposed on the metal las of the present invention.

Figure 5 (a) (b) (c) is an exemplary cross-sectional view showing a state in which the bent metal lath of the present invention is used overlapping.

6 shows a state in which the metal lath of the present invention is used in various structural parts of the structure, (a) is a square beam or column, (b) is a wall, (c) is a slab, (d) is a circular column Illustrated cross section showing the state used.

* Explanation of symbols for main parts of the drawings

10: bending metal lath 11: cracks

12: part 14: bone part

The present invention relates to a bent metal las for concrete structures that can be arranged as a reinforcing bar in a structural part subjected to a large moment load in a concrete structure, thereby making it easier and more accurate to perform reinforcing reinforcement work of the concrete structure.

Originally, concrete is strong in compressive stress but vulnerable to tensile stress. Therefore, in various members that receive moments in the structure, reinforcing bars are placed at regular intervals in areas where tensile stress is applied, so that they can receive not only compression but also tensile stress. This is the basic principle of reinforced concrete structures. Therefore, in the reinforced concrete structure, the reinforcing steel assembly construction occupies a very important position, and the spacing between the reinforcing steel and the reinforcing bars is a factor that critically determines the quality of the structure. However, it was actually very difficult to expect the accuracy of the gaps to be maintained above a certain level in the rebar assembly work performed by manual rebar workers at the construction site. In addition, in recent years when construction labor has risen rapidly, it has become more difficult to maintain a certain level of quality in rebar assembly works.

On the other hand, after the wire lath or metal lath is placed on the surface of the structure body in the plastering work and plastered with a plastering material such as mortar and cured, the wire lath or metal lath is evenly distributed and transferred to the structure body by spreading the load transferred from the outside to the plastering layer. Mainly used to prevent cracking of layers. Such a wire lath or metal lath can be recognized as a result of the assembled reinforcing steel plates which are arranged at regular intervals in the factory. Therefore, the construction site becomes a material that can greatly reduce the effort to accurately match the gap between the rebar and the rebar. On the basis of this recognition, in recent years, when lagging concrete roads or factories, wire laths or metal laths have been used as tension reinforcing members.

Nevertheless, such wire laths or metal laths were not used as tensile reinforcing members in structures such as walls, columns, beams, and slabs that are subjected to large moment loads. There are many reasons for this, but the main reason is that the wire lath or metal lath is processed into flat plates or curved plates with large curvature and supplied to the construction site. This was because it was considered impossible to use it as a reinforcement member that could withstand the load.

An object of the present invention is to be processed as having a cross-sectional shape capable of withstanding large loads to be placed as a reinforcing bar in the structural part subjected to a large moment load in the structure, to make the reinforcement construction of the structure more easily and precisely concrete structure It is to provide dragon bending metal lath.

Hereinafter, the technical configuration of the present invention in detail.

The present invention is to bend the metal lath, the cross-section on one side of the peak, the connecting portion, and the valleys are repeated so as to have a waveform shape as a whole, so that the cross-sectional secondary moment is increased to increase the resistance to large moment loads Is given its technical configuration features.

Here, since the connection state of the intersection point where the wire and the wire cross the wire is weaker than that of the metal lath, the wire has a problem that it is difficult to properly maintain the bending shape as a normal strength when the bending operation is performed. This problem is why the present invention does not include the wire as its material. In addition, it is preferable that expanded metal is selected among the metal laths. As shown in the drawing, an expanded metal refers to a metal lath that is made by pulling both edges after the iron plate is formed in a zigzag form at the predetermined intervals and lengths. Such expanded metal has the advantage of satisfying the needs of various structural systems because the thickness of the steel plate and the distance between the splitting part of one line and the splitting part of the next line can be freely adjusted within a certain range. The expanded metal may be easily bent to the same extent as the general steel sheet through the rolling process, or may be performed to the bending process without undergoing an upstage process.

As shown in FIG. 2, the bent metal lath 10 of the present invention has a peak shape in which the peak portion 12, the connection portion 13, and the valley portion 14 are repeated, and the unit waveform is a circular arc. Various choices may be made depending on structural or manufacturing needs, such as triangle, triangle, or trapezoid. The bent metal lath 10 having a quadrangular unit waveform is suitable for use for walls of structures, and the bent metal lath 10 having a trapezoidal unit waveform is suitable for being used for slabs of structures.

Separate reinforcement 20 may be disposed on the peak 12 or valley 14 of the bent metal lath 10 of the present invention. As shown in FIG. 4, the reinforcement 20 may be disposed to be elongated in the traveling direction of the waveform, that is, at right angles to the peaks 12 or the valleys 14. 12) or valleys 14 may be disposed in the longitudinal direction. The reinforcement 20 disposed in the direction of the wave form serves to stabilize the overall shape of the present invention, and the reinforcement 20 disposed in the longitudinal direction of the peaks 12 or the valleys 14 is bent in the present invention. By reinforcing the second moment of the cross section of the metal lath 10 serves to bind to a greater moment load. The reinforcing material 20 may be selected and used according to the needs of the work and structural dynamics, such as thick reinforcing bar, band iron, various section steel. In addition, the reinforcing material 20 is preferably fixed to the portion in contact with the bent metal lath 10. The fastening means can be selected by welding or twisting the wire.

The bent metal las of the present invention can be used so that two sheets overlap each other, as shown in FIG. At this time, the overlapping method is a symmetrically arranged while the waveforms of the two bent metal laths 10 of the same shape are matched, the manner in which the bone parts in contact with each other are fixed to each other; A method in which the waveforms of the two bent metal laths 10 are used to overlap each other at right angles; And the bending metal las and the conventional flat metal las 30 of the present invention may be used to overlap each other. Here, the parts where the metal lath and the metal lath overlap and are in contact with each other are preferably fixed to each other by fixing means such as welding or an iron wire.

The bending metal lath 10 of the present invention is used as a substitute for the reinforcing bar of the concrete structure.

For the one-way slab, it is preferable that the bending metal lath 10 having a trapezoidal unit waveform and the flat metal lath overlap with the tensile force acting. For bidirectional slabs, the bent metal laths 10 of the present invention are preferably used in such a manner that their waveforms are perpendicular to each other. As described above, when the bending metal lath 10 of the present invention is used as a substitute for reinforcing bars in slab construction, the placement intervals of the transverse rebars and the longitudinal rebars are set as they are in the product manufactured and supplied at the factory, and thus required for assembling the metal in the field It greatly reduces the effort.

As for the circular column, it is preferable that the bending metal lath 10 of the present invention is used in a circular shape. It is preferable that the bent metal lath 10 of the present invention is arranged on each side so that the corner portions are fixed to each other and used for the quadrilateral pillar or the quadrilateral beam. Thus, when the bending metal lath 10 of the present invention is used in columns or beams, it significantly reduces the effort required to assemble the reinforcement or reinforcement and to arrange the spacing between the main reinforcing bars.

As described above, the bent metal las of the present invention used in the above manner, firstly, to maintain the strength of the reinforcing bars and rebars in the reinforcing assembly of concrete structures to make the strength of the structure as a whole uniform, and second In addition, it is very useful to reduce the labor cost of reinforcing steel reinforcement work of concrete structures, and consequently to save huge labor cost.

Claims (9)

Bending metal for concrete structures, characterized in that the end of one end of the mountain, the connecting portion, and the valley part is repeated to have a waveform shape as a whole, so that the cross-sectional secondary moment is increased to increase the resistance to large moment loads Lars. The bending metal lath according to claim 1, wherein the metal lath is made of expanded metal. 3. The bending metal lath according to claim 2, wherein the unit waveform forming the waveform has a quadrangular shape. The bending metal lath for concrete structures according to claim 2, wherein the unit waveform constituting the waveform has a trapezoidal shape. The bending metal lath according to claim 2, wherein separate reinforcements are disposed and fixed at predetermined intervals on the peaks or valleys. The bending metal lath according to claim 5, wherein the reinforcement is disposed in the longitudinal direction of the hills or valleys. The bending metal lath according to claim 5, wherein the reinforcement is disposed at right angles of the hills or valleys. The bending metal lath for concrete structures according to claim 5, wherein the reinforcing material is a reinforcing bar. The bending metal lath for concrete structures according to claim 5, wherein the reinforcing material is a section steel.