KR100875698B1 - Unit pannel for holllow concrete slab - Google Patents

Abstract

A unit panel for a hollow slab is provided to reduce the cost and time required for arranging and assembling a lightweight body in a job site, and to make site installation and conveyance easy by making lightweight in comparison with a half PC hollow slab. A unit panel for a hollow slab assembled with a lightweight body integrally comprises a lower wire mesh(10), plural lightweight bodies(20), an upper wire mesh(11), and a truss member(30) fixed to the upper wire mesh and the lower wire mesh, wherein the lightweight body comprises a hemispheric upper lightweight body, a hemispheric lower lightweight body installed opposite to the upper lightweight body, and a cylindrical height adjustment unit installed between the upper lightweight body and the lower lightweight body.

Description

Unit panel for hollow slab {UNIT PANNEL FOR HOLLLOW CONCRETE SLAB}

The present invention relates to a unit panel for a hollow slab, and more particularly to a unit panel for a hollow slab in which a lightweight body is integrally assembled.

Recently, various methods have been put into practice to increase the strength by increasing the thickness of the slab to increase the height of the building or to secure a large living space, or to hollow out by installing buried materials inside the slab to reduce the weight or improve the sound insulation performance. .

Hollow core slab (hollow core slab) is a structure having a hollow body or a lightweight body in the center to reduce the weight of the slab as the panel weight is reduced and has a relatively excellent cross-sectional performance, such hollow slab has a long span (long span) and The advantages of flatslabs as well as the advantage of reducing the noise between floors.

As a conventional hollow slab, there is a hollow slab as shown in FIG. The hollow slab, the slab formwork in the field and supporting the formwork with a support such as a copper bar, after placing the slab lower reinforcing bar and the lower wire mesh on the slab formwork, the lightweight body on the lower wire mesh and the The upper wire mesh and the upper reinforcing bar are placed on the lightweight body, and then slab concrete is completed.

However, in the case of hollow slab, the buoyancy force that the lightweight body tries to float on the surface of the concrete acts strongly due to the difference in density between the lightweight body and the concrete during casting, and defects are likely to occur in the hollow slab due to the buoyancy. .

Accordingly, in the construction of a conventional hollow slab, a hole is drilled in the slab formwork at the site to fix the lower wire mesh to the slab formwork, and the upper wire mesh and the lower wire mesh are fixed at the site by a ties or the like, or by welding. Since it is fixed, there was a problem that a lot of time and effort is generated in the fixing operation for preventing buoyancy of the lightweight body.

In addition, in the conventional hollow slab, various types of buoyancy prevention devices have been proposed to prevent the buoyancy of the lightweight body, but since the lightweight body should be placed directly in the field and the lightweight body buoyancy prevention device should be fixed and fixed, The installation of the sieve and the installation of the buoyancy prevention device takes a lot of time and money, there is a problem that frequently occurs when the lightweight body is stepped on the light body after placing the lightweight body.

On the other hand, a half PC hollow slab has been proposed as a method for solving the problems caused by light body placement and concrete placing in the field. Such a half PC hollow slab is a method of arranging hollow bodies in the factory and placing concrete for a certain thickness of the slab to cure it, and then bringing it to the site and constructing it as a substitute for slab formwork.

However, since the half PC hollow slab has a very heavy weight per unit area because concrete is poured, it is not easy to transport and there is a problem in the joint portion between the other hardened concrete surface and the concrete surface that is subsequently poured. There is a problem that partial repair work is not easy when the breakage occurs in the concrete or lightweight body during easy movement to the site.

The present invention is to solve the above-mentioned problems of the prior art, the object of the present invention is to provide a unit panel in which a lightweight body is assembled in advance in a factory to a certain standard and the cost required for the placement and assembly of the lightweight body in the field and It is an object of the present invention to provide a unit panel in which a light body for a hollow slab can be assembled integrally, which can save time and is lighter than a half PC hollow slab, which is easy to install and transport in the field.

In order to achieve the above object, the unit panel in which the lightweight body according to the present invention is integrally assembled includes a lower wire mesh, a plurality of lightweight bodies arranged in a plurality of rows in a plurality of rows on the lower wire mesh, and And a truss member disposed along the plurality of rows or the plurality of rows and fixed to the upper wire mesh and the lower wire mesh.

The truss member is composed of an upper chord fixed to the upper wire mesh, a lower chord fixed to the lower wire mesh, and a truss material disposed obliquely between the upper chord and the lower chord. do.

The light weight body includes a hemispherical upper lightweight body, a hemispherical lower lightweight body provided to face the upper lightweight body, and a cylindrical height adjustment unit provided between the upper lightweight body and the lower lightweight body. It is characterized by including.

The upper light body is formed along an outer surface of the upper light body and passes through a hemispherical vertex and a first groove into which a wire mesh installed on the light body is inserted, and passes through the hemispherical vertex. A wire mesh installed at an upper portion of the upper portion of the upper mesh member and having a second groove formed along an outer surface of the upper light body in a direction orthogonal to the first groove;

The lower weight body is formed along an outer surface of the lower weight body and passes through a hemispherical vertex and a third groove into which a wire mesh installed under the light weight body is inserted, and passes through the hemispherical vertex. The wire mesh is installed in the lower portion of the fitting is characterized in that it comprises a fourth groove formed along the outer surface of the lower light body in a direction orthogonal to the third groove.

Each of the first groove and the third groove further includes a two-stage groove formed deeper by the depth of the second groove and the fourth groove in a portion orthogonal to the second groove and the fourth groove. .

The lightweight body is characterized in that the hollow slab is installed only in the thickness of 200mm to 400mm.

The upper wire mesh is characterized in that the replacement of the temperature reinforcement to the hollow slab.

A lower reinforcing bar according to the structural design of the hollow slab is further reinforced under the lower wire mesh, and the lower wire mesh is fixed to the lower reinforcing bar.

In addition, the buoyancy preventing member is fastened to the upper wire mesh to prevent the buoyancy of the lightweight body, the buoyancy preventing member is formed at one end is bent to fit the upper wire mesh, the other end is A buoyancy prevention rod having a thread formed therein, a through hole is formed at the center thereof, and a thread is formed at an inner wall of the through hole so that the thread of the buoyancy prevention rod is inserted and screwed thereto, and a thread is formed at one end thereof. Is inserted into the fixing member is screwed and the other end is characterized in that it has a fastening fixing member for fixing the buoyancy preventing member to the form with the fixing member through the formwork is installed the unit panel.

According to the present invention as described above, by providing a unit panel assembled in advance at the factory in a light weight to a certain standard, it is possible to reduce the cost and time required for the placement and assembly of light weight in the field, thereby reducing the overall construction period It is possible to minimize the occurrence of defects in the field, and it is lighter than the half PC hollow slab, and it is easy to install and transport in the field, and also to place the loading space in the site as compared to arranging the light body directly in the field. It can be minimized.

In addition, a plurality of lightweight bodies can be provided integrally in the form of a unit panel, can be easily and easily installed in the field, and the use of reinforcing steel and concrete of the slab itself can be reduced according to the weight reduction. This can save you money.

In addition, it is possible to reduce the amount of concrete used to increase the volume of the light weight body, and the height of the light weight body can be adjusted by the height adjusting part even if the volume of the light body is large, so that the slab thickness is not produced separately of various sizes of light body. Since it can be applied to the change of the cost, there is an advantage to reduce the cost, and by having the fixing groove can easily fix the reinforcing bar or wire mesh for preventing buoyancy of the lightweight body and at the same time the reinforcing bar or wire mesh Since it can be seated within the height of the lightweight body can reduce the coating thickness can prevent the increase of the slab thickness due to the increase in the coating thickness can reduce the overall use of concrete, thereby reducing the cost.

Hereinafter, with reference to the accompanying drawings will be described in detail with reference to the embodiment for a unit panel for a hollow slab integrally assembled lightweight body according to the present invention.

3 is a perspective view showing a unit panel in which a lightweight body according to the present invention is integrally assembled, and FIG. 4 is an exploded perspective view thereof.

As shown in Fig. 3 and Fig. 4, the hollow slab unit panel 1 according to the present invention includes a lower wire mesh 10, a lightweight body 20, an upper wire mesh 11, and a truss member ( 30).

The lower wire mesh is spaced apart from the bottom surface of the slab at a predetermined interval (by coating thickness) through a spacer or the like. In the present embodiment, the lower wire mesh 10 uses one of φ8, and a grid size of 250 mm is used. However, the lower wire mesh 10 is not limited thereto, and the lower wire mesh 10 may have a suitable diameter and grid size.

The lightweight body 20 is disposed above the lower wire mesh. The lightweight body may be configured as a one-way slab by using a hollow or hollow elongated lightweight body 20 ', as shown in FIG. 4B.

The light body may be a spherical shape, and as shown in FIG. 5, it is preferable to use a hemispherical shape in the upper and lower parts and a cylindrical shape in the middle part.

The lightweight body 20 is provided in plural and arranged in plural rows in plural rows in a checkered pattern. In addition, the lightweight body 20 is preferably used to have a lightweight body having a support (20a) formed integrally with the lightweight body in order to be seated on the formwork panel.

The light weight body 20 is composed of an upper light weight body 21, a lower light weight body 22, and a height adjusting part 23.

The upper light weight body 21 is composed of a hemispherical shape and a vertical wall portion extending from the hemispherical shape. In the present embodiment, the upper light weight body is formed in a dome shape or a hemispherical shape, but is not limited thereto. It can be formed in the three-dimensional shape of. The vertical wall portion is formed in a cylindrical shape and extends vertically downward from the lower end of the hollow portion and is integrally provided with the hollow portion.

Since the configuration of the lower weight body 22 is substantially the same as the configuration of the upper weight body, duplicated description is omitted.

In addition, by providing a plurality of supports 20a formed integrally with the hollow part at a predetermined position of the hollow part of the lower light body, while being able to be seated on the slab on which the light body is installed, between the light body and the concrete surface It can be configured to function as a spacer for maintaining the coating thickness.

One or a plurality of height adjusting units 23 may be installed between the upper lightweight body and the lower lightweight body. The height adjusting portion 23 is formed in a hollow cylindrical shape, the diameter of the cylinder is configured to be the same as the diameter of the first vertical wall portion and the second vertical wall portion.

Here, the upper and lower lightweight bodies may be directly connected to each other without using the height adjusting unit, and a plurality of the height adjusting units may be used to appropriately respond to changes in the thickness of the slab.

For example, the upper lightweight body and the lower lightweight body is configured to a height of 85mm, the height adjusting portion to 50mm in height, when the slab thickness is 250mm by directly connecting the upper and lower lightweight body to form a lightweight body for hollow slab, If the slab thickness is 300mm, the upper lightweight body, one height adjuster, the lower lightweight body is connected to form a lightweight body, and if the slab thickness is 350mm, the upper lightweight body, two height adjuster, the lower lightweight body is connected A lightweight body can be comprised.

As a result, even when constructing the same structure, the thickness of the slab is differently applied to a space such as a bathroom, so that the number of the height adjusting units may be appropriately selected according to the change in the thickness of the slab, thereby forming a lightweight body.

Accordingly, the upper and lower lightweight bodies can be manufactured using the same mold without having to manufacture the lightweight bodies of various sizes according to the thickness of the slab, thereby reducing the cost of manufacturing the lightweight bodies.

In addition, since a lightweight body having a constant curvature can be used irrespective of the position where the lightweight body is installed, it can be produced and installed at a constant interval between the reinforcing bars and the wire mesh installed on the upper part of the lightweight body. Can reduce the production cost and improve the workability.

In the present embodiment, the upper light weight body, the lower light weight body, and the height adjusting portion is made of a synthetic resin such as polypropylene, but is not necessarily limited to those of various materials such as steel plate, styrofoam can be appropriately used if necessary. Of course.

On the other hand, the upper lightweight body 21 has the first groove 21a and the second groove 21b which are orthogonal to each other. The first groove 21a is formed along the outer surface of the upper light body and passes through a hemispherical peak, and the depth of the first groove is the diameter of the reinforcing wire or wire mesh installed on the upper portion of the light body. It is formed slightly larger, so that rebar or wire mesh is inserted. In this embodiment, the depth of the first groove is approximately 10 mm.

The second groove 21b has a hemispherical vertex and is fitted with a wire mesh installed in the upper portion of the lightweight body and is installed in a direction orthogonal to the first groove, and is approximately the same depth as the first groove. Has

The lower lightweight body 22 has a third groove 22a and a second groove 22b that are perpendicular to each other. The third groove 22a is formed along the outer surface of the lower light body and passes through a hemispherical peak, and the depth of the third groove is the diameter of the reinforcing wire or the wire mesh installed under the light body. It is formed slightly larger, so that rebar or wire mesh is inserted. In this embodiment, the depth of the third groove is approximately 10 mm.

The fourth groove 22b has a hemispherical vertex and is fitted with a wire mesh installed in the lower portion of the lightweight body and is installed in a direction orthogonal to the third groove, and is approximately the same depth as the third groove. Has

On the other hand, each of the first groove and the third groove is a two-stage groove (21a ', 22a' formed more deeply as the depth of the second groove and the fourth groove in the portion orthogonal to the second groove and the fourth groove). ) Is further provided. By providing the two-stage groove, both the reinforcing bars and the lattice-shaped wire mesh that are arranged in the transverse and longitudinal muscles can be inserted into the upper and lower lightweight bodies.

As described above, by forming grooves in the upper and lower lightweight bodies, reinforcing bars and wires can be more stably and simply arranged in the grooves, and thus the lightweight bodies can be placed in more accurate positions.

In addition, it is possible to avoid the placement of reinforcing bars or wire mesh in the relatively weak portion of the hemispherical upper and lower lightweight body is not the peak. In addition, since the groove can function as a reinforcing core of the hemispherical upper and lower lightweight bodies, it is structurally more stable, and since the wire mesh is accommodated within the height of the lightweight bodies, the coating thickness can be reduced, thereby reducing the overall use of slab concrete. When the concrete is poured, the groove may serve as an air passage of bubbles of concrete.

On the other hand, the height adjusting portion may be provided with coupling grooves corresponding to the first to the fourth groove, respectively.

In addition, connection ends 24a, 25a, and 26a for closing the grooves are further provided at ends of the first to fourth grooves and the coupling grooves, respectively, and the connection formed in the first grooves and the second grooves. Coupling protrusions 24b and 25b are formed on the membrane and the connection membrane formed on the lower side of the height adjustment part, and the connection membrane formed on the third groove and the fourth groove and the connection membrane formed on the upper side of the height adjustment part. The coupling holes 25c and 26b are formed in the upper and lower lightweight bodies and the height adjustment part through the coupling holes.

An upper wire mesh 11 is disposed on the upper portion of the lightweight body, and the upper wire mesh 11 is the same as the structure of the lower wire mesh, and thus redundant description thereof will be omitted.

The installation of the lightweight body and the upper and lower wire meshes of the unit panel having the above-described configuration will be described.

8A to 9B are views illustrating installation of different lightweight bodies and different wire meshes. As shown in Figs. 8A to 9B, the construction of the hollow slab using the unit panel according to the present invention preferably uses arrangements of different lightweight bodies and different wire meshes depending on the thickness of the slab.

Table 1 shows the size change of the lightweight body according to the thickness of the hollow slab.

Unit: mm

Slab thickness 250 300 350 400 450 500 600 a1, a2 (= b) 85 125 v1, v2 - 50 100 150 100 150 250 H1, H2 170 220 270 320 350 400 500 h1, h2 140 190 240 290 320 370 470

Here, the width of the lightweight body having the first to fourth grooves and the two-stage groove is L1, the height of the upper and lower lightweight bodies of the lightweight body is respectively a1 and b1, the height of the lightweight body is H1, and the height adjusting part The height is v1, and the distance between the centerlines of the upper and lower wire meshes inserted into the grooves of the lightweight body is represented by h1.

In addition, the width of the light weight body without each of the grooves is L2, the heights of the upper and lower light weight bodies of the light weight body are respectively a2 and b2, the height of the light weight body is H2, and the height of the height adjusting portion is v2. H2 denotes the distance between the center lines of the upper and lower wire meshes disposed near the apex of the lightweight body.

As shown in Table 1 and FIGS. 8A to 9B, when the thickness of the hollow slab to be constructed is 250 mm, 300 mm, 350 mm and 400 mm, respectively, L1 is 220 mm, a1 and b1 is 85 mm, H1 is 170 mm, 220 mm, 270mm, 320mm and h1 are 140mm, 190mm, 240mm and 290mm, respectively.

On the other hand, when the thickness of the hollow slab exceeds 400mm, H1 becomes 350mm or more, so H1 becomes 1.5 times or more than L1, and v1 becomes 2 times or more than a1 and b1, so that it is not stable on the bottom of the slab. There is a risk of not.

Therefore, when the thickness of the hollow slab exceeds 400 mm, the larger one of the lightweight body is used, which is shown in Fig. 8B. That is, when the thickness of the hollow slab to be constructed is 450mm, 500mm and 600mm, respectively, L2 is 350mm, a2 and b2 is 125mm, H2 is 350mm, 400mm, 500mm and h1 is 320mm, 370mm, 470mm, v2 respectively. 100mm, 150mm and 250mm respectively. At this time, as the width of the light body becomes larger, when the light body is formed of the light body having the above-described grooves, the size of the grid of the upper and lower wire meshes, that is, the spacing of the upper and lower wire meshes becomes too large. As shown in FIG. 8B and FIG. 9B, it is comprised so that upper and lower wire meshes may be arrange | positioned at the left and right sides of the vertex of a hemispherical part, without having the groove mentioned above.

In addition, in the above-described configuration, the upper wire mesh may be used as a substitute for the temperature reinforcing bar against the stress caused by the dry shrinkage to the upper portion of the slab. As a result, there is no need to reinforce the additional temperature reinforcing bars, further reducing the cost and time required for construction.

Also, generally, a plurality of rebars are disposed below the slab to bear a load acting on the slab. To this end, after finishing the reinforcement of the lower reinforcement according to the structural design in the factory, by placing the unit panel on the reinforcement lower reinforcement and fastening the lower wire mesh and the lower reinforcement to each other, reinforcement and light weight in the field As the assembly of the sieve can be replaced, the construction quality can be improved and the construction period can be shortened.

On the other hand, the truss member 30 is arrange | positioned along the one line of the several column or the several row in which the said lightweight body was arrange | positioned. In the present embodiment, the truss member is disposed along one line of the plurality of columns (or plural rows) of the light weight body, for example, one in two lines, that is, the light weight body is disposed on the left and right sides of the truss member, respectively. Thus, one truss member is arranged to bear the buoyancy of the light bodies of the two lines. In addition, the truss member may support the concrete placing load.

The truss member 30 is composed of an upper chord 31, a lower chord 32, and a truss material 33, and the upper chord 31 is welded to the upper wire mesh by various other methods. The lower chord 32 is fixed to the lower wire mesh by welding and various other methods, and the truss material 33 extends along the longitudinal direction of the truss member between the upper chord and the lower chord. Arranged obliquely and fixed to the upper chord and the lower chord to prevent in-plane buckling of the truss member against compression loads acting on the upper chord and the lower chord.

delete

delete

delete

delete

delete

delete

delete

The unit panels constructed as described above are stacked and transported to a construction site using a crutch, and the unit panels are connected to the lower reinforcing bars, and if necessary, the installation of the upper bars is further completed. Hollow slab using the unit panel according to the present invention, the bottom surface of the slab, such as a flat plate (flat plate), the surface is smooth, free pipes, such as equipment can be easily reflected exposed concrete design, the experimental results of the present inventors It was found that 30-45% of the slabs could be reduced in weight and useful in long span slab structures.

In addition, it can be seen that by using the hollow slab structure, the noise reduction as well as the thermal insulation effect can be increased, and according to the self-weight reduction, approximately 20% of the slab use and about 35% of the concrete use can be reduced. .

The present embodiment merely shows a part of the technical idea included in the present invention clearly, and modifications and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification of the present invention All are included in the technical idea of the present invention.

1 is a view showing a conventional hollow slab.

2 is a cross-sectional view showing the concept of a general hollow slab.

3 is a view showing a unit panel according to the present invention.

4A and 4B are exploded perspective views of a unit panel according to the present invention.

5 is a view showing an example of a lightweight body according to the present invention.

6 is an exploded perspective view of the lightweight body according to the present invention.

delete

8A and 8B are views showing the lightweight body of the present invention.

9A and 9B are views showing the arrangement of the lightweight body and the wire mesh according to the present invention.

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

1: formwork

10: lower wire mesh 11: upper wire mesh

20: lightweight body

30 truss member

Claims (12)

delete delete delete delete delete delete A lower wire mesh, a plurality of lightweight bodies that are unit weight bodies arranged in a plurality of rows in a plurality of rows on the lower wire mesh, an upper wire mesh disposed above the lightweight body, the upper wire mesh and the lower wire mesh It is configured to include a fixed truss member, The lower wire mesh, the lightweight body, the upper wire mesh and the truss member are preassembled at the factory. The light weight body includes a hemispherical upper lightweight body, a hemispherical lower lightweight body provided to face the upper lightweight body, and a cylindrical height adjustment unit provided between the upper lightweight body and the lower lightweight body. Equipped, The upper light body is formed along an outer surface of the upper light body and passes through a hemispherical vertex and a first groove into which a wire mesh installed on the light body is inserted, and passes through the hemispherical vertex. A wire mesh installed at an upper portion of the upper portion of the upper mesh member and having a second groove formed along an outer surface of the upper light body in a direction orthogonal to the first groove; The lower weight body is formed along an outer surface of the lower weight body and passes through a hemispherical vertex and a third groove into which a wire mesh installed under the light weight body is inserted, and passes through the hemispherical vertex. In the unit panel for a hollow slab is provided with a wire mesh is installed in the lower portion of the fourth groove is formed along the outer surface of the lower light body in a direction orthogonal to the third groove, Each of the first groove and the third groove further includes a two-stage groove formed deeper by the depth of the second groove and the fourth groove in a portion orthogonal to the second groove and the fourth groove. Unit panel for hollow slab. The method of claim 7, wherein The lightweight body is a hollow slab unit panel, characterized in that the hollow slab is installed only in the hollow slab thickness range of 200mm to 400mm. delete delete delete delete

Images