KR20030087194A - Steel reinforcing cage and reinforcing method of construction using steel reinforcing cage and steel fiber concrete for soft ground - Google Patents

Abstract

PURPOSE: A steel-frame cage is provided to enhance the strength on an area where the load of a building is concentrated and to shorten a period of construction for a building. CONSTITUTION: The steel-frame cage(30) contains a frame(31) composed of many columns(32) and holders(33), many stiffening bars(35) installed to be projected axially from the frame(31), and a spacer(37) connecting the stiffening bars(35) to the holders(33) to keep an interval between the stiffening bars(35) regularly. The reinforcement method using steel fiber concrete and a steel-frame cage comprises the steps of driving a pile on the ground, arranging steel-frame cages(30) to locate the upper part of the pile drove in the ground in the frame(31) of the steel-frame cage(30), and forming a footing slab by placing concrete on the ground containing the steel-frame cage.

Description

Steel reinforcing cage and reinforcing method of construction using steel reinforcing cage and steel fiber concrete for soft ground}

The present invention relates to a reinforcing cage and a reinforcing method using the same, and more particularly, to a reinforcing cage and a reinforcing method using the same to install the reinforcing cage in the portion of the load concentration in the building to reinforce the strength of the concrete.

In general, a lot of loads are applied to the foundation slab or mat in a building. In particular, a large shear force and a moment act on the part where the pile and the ground beam abut or the part where the column and the mat abut.

First, referring to Figure 1 will be described to form the foundation slab in the prior art. First, the pile 3 is put in the ground 1 to which a building will enter. The pile 3 is embedded in the ground (1) in accordance with the design conditions of the building. And the main head of the pile (3), that is, the portion projecting on the ground (1) by cutting to a predetermined length to organize.

And the trench according to the position where the building will be placed, and forms the underground beams 5 to connect between the upper end of the pile (3). The underground beam 5 is composed of reinforced concrete, for this purpose, first to reinforce the reinforcing bar 6 (see Fig. 2) and form the underground beam formwork. And the concrete beam is poured into the underground beam formwork to complete the underground beam (5). When the subterranean beam (5) is completed, it fills up.

Next, the slab reinforcing bars 8 for forming the foundation slab 7 on the underground beams 5 are reinforced. The slab reinforcement 8 is placed in the entire area where the foundation slab 7 is formed. When the reinforcement of the slab reinforcement (8) is completed, the concrete is poured into the slab reinforcement (8) to complete the foundation slab (7).

However, the prior art as described above has the following problems.

In the prior art as described above, a relatively large number of processes must be performed to form the foundation slab 7, which causes a problem of complicated construction and long air.

In the related art, since the underground beams 5 of the reinforced concrete are formed on the upper end of the pile 3, and the foundation slab 7 is formed of the reinforced concrete on the underground beams 5, the overall construction cost is increased. Here, the slab reinforcement (8) is arranged in the base slab 7 in its entirety, causing the construction cost to increase. In practice, reinforcing bars are time-consuming.

In particular, when the pile 3 supports the underground beam 5 after completion of the building, a large shear force and a moment occur in the area A of FIG. 1 due to the load of the building. Therefore, in order to avoid breakage of the area, more steel bars are used and the thickness of the ground beam 5 or the foundation slab 7 is increased. In this way, the amount of concrete and reinforcing bar is increased, resulting in high construction costs.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to provide a reinforcing cage that can reinforce the strength of the portion where the load of the building is concentrated.

Another object of the present invention is to provide a reinforcement method that can shorten the air and reinforce the strength of the building using a reinforced cage.

1 is a cross-sectional view for explaining a method for slab soft ground according to the prior art.

2 is a cross-sectional view taken along the line AA ′ of FIG. 1.

Figure 3 is a perspective view showing the configuration of a preferred embodiment of the steel cage according to the present invention.

Figure 4a is a cross-sectional view for explaining the basic slab reinforcement method using a steel cage.

Figure 4b is a plan view for explaining the basic slab reinforcement method using a steel cage.

4C is a cross-sectional view taken along the line AA ′ of FIG. 4A.

Figure 4d is a plan view showing that the auxiliary reinforcement bar is further installed in the steel cage in the embodiment of the present invention.

5 is a perspective view of a steel fiber constituting an embodiment of the present invention.

6 is a cross-sectional view for explaining a mat reinforcement method using a steel cage.

Explanation of symbols on the main parts of the drawings

30: steel cage 31: frame

32: column 33: support

35: reinforcing bar 37: spacing zone

50: ground 52: file

60: basic slab 70: steel fiber

71: body portion 73: bend portion

80: mat 90: pillar

According to a feature of the present invention for achieving the object as described above, the present invention is a frame formed in a cylindrical shape and the bottom is supported on the bottom, the frame is supported on the frame and extends in the lateral direction of the plurality to cross Installed with a height difference, it is configured to include a reinforcement bar to reinforce the strength of concrete.

The frame is composed of a plurality of columns erected substantially vertically, and a plurality of supports for connecting the columns and supporting the reinforcement bar, wherein the column and the reinforcement bar are formed of iron bars having a predetermined diameter.

A spacing support for maintaining the spacing between the reinforcing bars extending in one direction of the frame and reinforcing the strength of the concrete is further provided.

The reinforcement bar further reinforces the secondary reinforcement bar in response to the load condition applied to the portion where the steel cage is seated.

According to another feature of the present invention, the present invention comprises the steps of putting a pile in the ground, the steel cage so as to position the upper portion of the pile embedded in the ground in the frame of the steel cage, and the steel cage It comprises a step of forming a foundation slab by placing concrete on the ground surface.

The concrete includes steel fibers.

According to another feature of the present invention, the present invention comprises the steps of digging as much as the freezing depth along the outline of the position where the building will be placed, the step of placing the discarded concrete on the floor of the excavated in the step, and supports the load of the building And placing the steel cage on the discarded concrete corresponding to the lower portion of the pillar, and placing concrete at a predetermined height on the discarded concrete on which the steel cage is disposed.

The concrete also includes steel fibers.

According to the present invention having such a configuration can minimize the reinforcement in forming the foundation slab or mat, while reinforcing the strength of the portion that the relatively large load acts, and can minimize the concrete thickness of the foundation slab or mat Will be.

Hereinafter, a preferred embodiment of the reinforced cage according to the present invention and a preferred embodiment of the reinforcement method using the same will be described in detail with reference to the accompanying drawings.

3 is a perspective view of a reinforced cage of an embodiment of the present invention. As shown in the drawing, the frame 31 forms a skeleton of the reinforced cage 30. The frame 31 is composed of a plurality of columns 32 and supports 33. The column 32 allows the reinforcing cage 30 to be erected, and in this embodiment, three are installed substantially vertically at regular intervals.

A support 33 is provided to connect the columns 32. The support 33 is formed in a ring shape in this embodiment to allow the column 32 to be fastened at predetermined intervals to its outer circumference. The support 33 is not necessarily ring-shaped, but may have various shapes. For example, the support tool 33 may be formed in polygons, such as a square and a triangle. The support 33 may be fastened to the column 32 at predetermined intervals according to the design conditions, in this embodiment, two support 33 is used. The coupling between the column 32 and the support 33 is by welding. However, the column 32 and the support 33 may be fastened with a wire.

A plurality of reinforcing bars 35 are supported by the support 33 of the frame 31. The center of the reinforcement bar 35 is fastened to the support 33 so that both ends of the reinforcement bar 35 extend a predetermined length from the support 33. In the present embodiment, a pair of reinforcing bars 35 are fastened to the support 33 so as to have a cross shape. The reinforcing bar 35 is provided in the cross-shaped shape on the support 33, respectively. However, the reinforcing bar 35 does not necessarily have to be orthogonal to cross, and may be crossed at an angle other than a right angle.

The reinforcing bar 35 may further include an auxiliary reinforcing bar 35 ′. That is, according to the load conditions applied to the portion where the steel cage 30 is installed, as shown in Figure 4d, the secondary reinforcing bar (35 ') is further reinforcement horizontally and vertically.

On the other hand, the reinforcing bars 35 extending in the same direction to the upper and lower supporters 33, respectively, are connected by the spacing holder 37, so that the spacing is kept constant. In the present embodiment, four reinforcing bars 35 extending in the same direction are connected to the spacing holder 37 having a rectangular shape. The fastening of the reinforcing bar 35 and the spacing holder 37 may also be made of welding or wire. The spacing holder 37 is used an appropriate number corresponding to the extension length of the reinforcing bar 35. Therefore, the spacer 37 may not be used depending on the length of the reinforcement bar 35. Here, the spacing holder 37 also serves to reinforce the strength of the concrete.

Frame 31 (column 32, support 33), reinforcing bar 35 and the spacing holder 37 constituting such a steel cage 30 is preferably made of a metal material, for example For example, they can be made of rebar.

On the other hand, the steel cage 30 is not necessarily to be manufactured only by the reinforcing bar, for example, the frame is made of a metal plate cylindrical, forming a through hole instead of the support and the reinforcing bar made of reinforcing bar is installed through the through hole You can also

In addition, the steel cage 30 may be manufactured in advance in the factory only the frame 31 and the reinforcement bar 35 may be used to fasten the support 33 of the appropriate length according to the conditions of the construction site.

Next, a method of reinforcing the foundation slab or mat using the steel cage 30 will be described.

Figure 4 shows the configuration of the foundation slab using the foundation slab reinforcement method according to the present invention. The basic slab reinforcement method will be described with reference to this.

First, the pile 52 is embedded in the ground 50 on which the building will be placed. After the pile 52 is embedded in the ground 50, the tip of the pile is cut and arranged to protrude only a predetermined height from the surface of the ground.

Next, the steel cage 30 is seated on the portion where the pile 52 is embedded. That is, the lower side of the frame 31 of the steel cage 30 is to be a position corresponding to the upper portion of the pile 52. As such, the steel cage 30 is seated on each pile 52. This is to provide the foundation slab 60 with strength that can withstand even if shear force and moment are applied to the foundation slab 60 by the pile 52.

The auxiliary reinforcing bar 35 'is further placed on the steel cage 30 according to the load condition applied to the portion where the steel cage 30 is seated. That is, FIG. 4B shows that only the basic steel cage 30 is installed, and FIG. 4D shows that the auxiliary reinforcing bar 35 'is further placed.

After arranging the steel cage 30 as described above, the concrete is poured on the surface of the ground (50). At this time, the concrete is mixed with steel fiber 70 (Steel fiber). The steel fiber 70 is formed of a steel material as shown in Figure 5 is composed of a body portion 71 having a predetermined length in a straight line and the bent portion 73 formed at both ends thereof. The steel fiber 70 is included in the concrete serves to reinforce the strength of the concrete.

Here, the basic slab 60 of the present invention reinforces the strength by installing a steel cage 30 in the portion where a relatively large force is applied. And, by using the concrete containing the steel fiber 70 it is not necessary to reinforce the reinforcing bar to the entire base slab (60).

On the other hand, Figure 6 shows that the reinforcement method of the present invention is applied to the mat base portion of the steel frame building. According to this, the steel cage 30 is located in the position corresponding to the lower portion of the column 90 in the mat 80 formed on the surface of the ground (50). And the steel fiber 70 is mixed in the concrete to form the mat (80).

The process of forming such a configuration is explained. First, a work for stopping the surface of the ground 50 of the position where the building is seated. At this time, excavate as much as the freezing depth along the floor outline.

Next, the discarded concrete is poured on the stationary floor. It is preferable to mix the steel fiber 70 in the discarded concrete. And the steel cage 30 is seated on the discarded concrete. At this time, the position where the steel cage 30 is seated is a position where a lot of load acts in the construction, for example, the lower portion of the column 90.

After arranging the steel cage 30 in this way, the concrete is mixed with the steel fiber 70 is poured to complete the mat (80).

The steel cage 30 provides a force capable of withstanding the punching shear force around the column by forming the mat 80 as described above. And by using the concrete mixed with the steel fiber 70, the physical properties are improved, such as to prevent the crack of the concrete without reinforcing the reinforcing bar to the entire mat (80).

According to the steel cage and the reinforcement method using the same according to the present invention as described above in detail can be expected the following effects.

First, by using a steel cage, it is possible to reinforce the portion of the relatively high force of the foundation slab or mat and to reinforce the strength of the foundation slab or mat by the concrete mixed with steel fibers. Therefore, it is not necessary to reinforce the steel throughout the foundation slab or the mat, and the thickness of the foundation slab or mat can be relatively reduced.

Since it is not necessary to reinforce the bar throughout the foundation slab or mat, the work time required for the reinforcement can be eliminated, so that the foundation slab or mat can be formed relatively easily.

In addition, the use of steel fibers can reduce the thickness of the foundation slab or mat, thereby minimizing the consumption of materials for forming concrete, thereby shortening the construction period and reducing construction costs.

Claims (8)

A frame formed in a tubular shape and having a lower portion supported on the floor; Steel cage supported on the frame and extending in the lateral direction of the frame and provided with a height difference so that a plurality of crosses to reinforce the strength of the concrete. The method of claim 1, wherein the frame, A number of columns built vertically, Consists of a plurality of supports connecting the columns and the reinforcing bar is supported, The column and the reinforcement bar is characterized in that the steel cage is formed of a steel bar of a predetermined diameter. The steel cage according to claim 1 or 2, further comprising a spacing retaining hole for maintaining the spacing between the reinforcing bars extending in one direction of the frame and reinforcing the strength of the concrete. The steel cage according to claim 3, wherein the reinforcing bar further reinforces the auxiliary reinforcing bar in response to the load condition applied to the portion where the steel cage is seated. Putting files on the ground, Arranging the steel cage so that the upper part of the pile embedded in the ground is positioned inside the frame of the steel cage of any one of claims 1 to 4; Slab reinforcement method using a steel cage, characterized in that it comprises a step of forming a foundation slab by placing concrete on the ground surface including the steel cage. 6. The slab reinforcement method according to claim 5, wherein the concrete includes steel fibers. Digging as much as the freezing depth along the outline of the location where the building will enter; Casting the discarded concrete on the floor which was broken in the step; Arranging the steel cage of any one of claims 1 to 4 on the discarded concrete corresponding to the lower part of the pillar supporting the load of the building; Mat steel reinforcement method using a steel cage, characterized in that comprising the step of pouring concrete on a cast concrete on a cast iron concrete is disposed. 8. The method of claim 7, wherein the concrete includes steel fiber mat reinforcement method using a steel cage.