KR102639522B1 - A hollow slab deck plate system - Google Patents

Abstract

The deck plate system for a hollow slab according to the present invention includes a steel plate and a truss girder extending in a first direction on the steel plate, arranged in a plurality in a second direction perpendicular to the first direction, and having an upper chord and a lower chord. deck plate; a hollow body disposed between the plurality of truss girders; And a shear stopper coupled to both ends of the hollow body; It includes, and the shear stopper is characterized in that it has a tapered shape with a tapered end.

Description

Deck plate system for hollow slab {A HOLLOW SLAB DECK PLATE SYSTEM}

The present invention relates to a deck plate system for hollow slabs, and more specifically, to a deck plate system for reducing the overall load and increasing constructability, especially in hollow slabs for long spans.

A slab is a structure made by pouring concrete into a single plate, such as a concrete floor or the roof of a Western-style house. To date, various slab construction methods have been developed and are largely divided into conventional slab construction methods, PC slab construction methods, and deck slab construction methods.

Conventional slab construction methods have the disadvantages of requiring storage space for temporary materials such as plywood or scaffolding, causing environmental pollution due to waste materials, and causing safety accidents when dismantling the form. The PC slab method has the advantage of shortening the construction period by manufacturing slabs in advance at the factory and assembling them on site. However, the PC slab method has the advantage of shortening the construction period by manufacturing slabs in advance at the factory and assembling them on site. However, due to the large self-load, there is the burden of having to use lifting equipment that is limited to the site and the burden of on-site assembly. The downside is that it is difficult.

The deck slab method is a method of forming a slab by integrating a deck that acts as a formwork and a truss girder that acts as a reinforcing bar. In the early days of the deck slab construction method, a deck in which steel plates were integrated by welding was used, but after 2000, a demolding deck construction method that demolded the deck after forming the slab was developed.

Conventionally, slab decks produced domestically have multiple rows of truss girders consisting of upper and lower chords and lattices fixed to the upper surface of a floor steel plate of a certain thickness to serve as slab reinforcement and temporary materials during construction.

Meanwhile, as buildings become taller and larger, the need for floor plate lightweighting and space-saving technologies increases, and parking plan modules for more than three cars are changed, and high-load and long-span structures such as logistics centers and warehouses are required due to industrial development and urbanization. As demand increases, long-span truss decks become necessary, but because they are generally large and long, the load on the product itself is large, so constructability is poor. To this end, when concrete is buried after installing the deck plate, a structure of the deck plate is required that reduces the overall load and improves constructability while still applying the existing one-way RC slab design method.

A hollow deck plate system has been proposed as a solution to this problem. The hollow deck plate system was proposed with the idea that by inserting a hollow body between a plurality of truss girders in the deck plate system, the buried amount of concrete, which has a low contribution to the bending structural mechanics when buried in concrete, is reduced by the volume of the hollow body. It is a system that has been established. However, looking at the existing hollow deck plate system in terms of prior inventions, for example, in the conventional patent application No. 10-2010-0079695, utility model application No. 20-2000-0000782, patent application No. 10-2017-0069131, etc. As you can see, they all use hollow bodies, but the location of these hollow bodies is between truss girders when viewed in the height direction. That is, the conventional hollow body is configured to be located between the bottom steel plate of the deck plate and the upper chord corresponding to the uppermost part of the truss girder in the height direction. In order to construct a hollow body in this way, the height of the truss girder must be manufactured much higher than in the normal case. As a result, the height of the lattice of the truss girder has to be increased, greatly increasing the weight of the truss girder, and as a result, the weight of the deck plate is inefficient. increases, causing major problems during construction work.

The present invention, especially in the slab system for long spans, has a structure of a hollow deck plate in order to reduce the overall load and improve constructability, and is a hollow slab that can complement and replace the shortcomings and problems of the existing deck plate. The purpose is to provide a deck plate system.

The deck plate system for a hollow slab according to the present invention includes: a steel plate and a truss girder extending in a first direction on the steel plate, arranged in plural pieces in a second direction perpendicular to the first direction, and having an upper chord and a lower chord. deck plate; a hollow body disposed between the plurality of truss girders; And a shear stopper coupled to both ends of the hollow body; It includes, and the shear stopper is characterized in that it has a tapered shape with a tapered end.

The shear stopper includes a coupling portion coupled to the hollow body; A body portion constituting the body of the shear stopper; and a converging portion constituting the end of the shear stopper; It can be composed of:

The converging portion of the shear stopper may be a line converging portion or a point converging portion.

In the lower part of the hollow body, anti-sinking reinforcing bars may be disposed between the plurality of truss girders arranged in the second direction and supported on the lower chords of the truss girders.

The anti-sink reinforcing bar includes a lower reinforcing bar extending in the first direction; and a support part extending in the second direction, and may be arranged to be supported on each lower chord of two neighboring truss girders.

The support portion of the anti-sink rebar may have a curved end.

a wire mesh disposed on the hollow body; and an anti-float shear muscle consisting of an upper part, a body part, and a lower part, and connecting the wire mesh and the truss girder; It may further include.

The deck plate may be integrated or de-formed.

The upper part of the hollow body may be located higher than the top chord of the truss girder.

The exterior of the hollow body may further include rigid ribs.

The wire mesh may be configured in a grid shape with a plurality of main bars extending in the first direction and a plurality of reinforcement bars extending in the second direction.

The plurality of main bars of the wire mesh may be formed with an interval such that they are at least aligned with the top chord of the truss girder.

At least one of the upper and lower portions of the injury-prevention shear muscle may have a hook shape, and the body portion of the injury-prevention shear muscle may have a straight vertical shape.

The upper part of the anti-float shear muscle may be coupled to the main bar of the wire mesh, and the lower part of the flotation-prevention shear muscle may be coupled to the top chord of the truss girder.

The diameter of the upper chord of the truss girder may be smaller than the diameter of the lower chord.

By using the hollow deck plate of the present invention, it is possible to reduce the overall load and improve constructability, especially in long-span decks. Specifically, the hollow deck plate of the present invention has a hollow body disposed, and has the effect of reducing the amount of buried concrete, which has a low contribution to flexural structural mechanics, by the volume of the hollow body when buried in concrete. Shear plugs are coupled to both ends of the hollow body. Under the hollow body, anti-settlement reinforcing bars supported on the lower chord are disposed between a plurality of truss girders to form additional lower reinforcing bars and at the same time prevent settlement of the hollow body. As the wire mesh is disposed on the hollow body, it serves to prevent the relatively light hollow body from floating. Meanwhile, anti-floating shear muscles are combined with the truss girder and wire mesh to fix them and prevent the hollow body from floating. In addition, through this structure, the body of the injury prevention shear muscle can also perform the role of the shear muscle of the slab. The upper main bar of the slab is played by the main bar of wire mesh, which not only reduces the weight by reducing the diameter of the upper chord of the truss girder, but also reduces the weight of the lattice by eliminating the need to increase the height of the truss girder itself. Therefore, the weight of the entire deck plate can be reduced. Therefore, using the hollow deck plate system according to the present invention, even if a deck plate for a long span is manufactured, it is lighter than an existing deck plate, and even if a truss girder for a long span of 8 m or more is used, it is a lifting equipment that is operated in a limited field. The use of can be minimized, and deck plate paneling/assembly can be done by manpower, resulting in excellent constructability.

Therefore, the deck plate for hollow slabs according to the present invention can improve or overcome the problems and vulnerabilities of existing deck plates.

Figure 1 is a perspective view showing the structure of a deck plate system for a hollow slab according to an embodiment of the present invention.
Figure 2 is a perspective view showing the components of the deck plate in the deck plate system for hollow slabs according to an embodiment of the present invention.
Figure 3 is a perspective view showing the components of the hollow body and the shear stopper in the deck plate system for hollow slabs according to an embodiment of the present invention.
Figure 4 is an enlarged perspective view of the front end stopper portion of Figure 3.
FIG. 5 is a cross-sectional view showing a central section of the hollow body of FIG. 3.
Figure 6 is a side view of Figure 3.
Figure 7 is a perspective view showing the shape of the shear stopper according to the first embodiment in the deck plate system for hollow slabs according to an embodiment of the present invention.
Figure 8 is a perspective view showing the shape of the shear stopper according to the second embodiment.
Figure 9 is a perspective view showing the components of the wire mesh in the deck plate system for hollow slabs according to an embodiment of the present invention.
Figure 10 is a front view of Figure 9.
Figure 11 is a front view showing the components of the anti-float shear muscle in the deck plate system for hollow slabs according to an embodiment of the present invention.
Figure 12 is a perspective view showing the components of anti-sink rebar in the deck plate system for hollow slabs according to an embodiment of the present invention.
Figure 13 is a perspective view showing that anti-settlement rebar according to an embodiment of the present invention is disposed on a steel plate and a truss girder.
Figure 14 is a front view of Figure 13.
Figure 15 is a front view of a deck plate system for hollow slabs according to an embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

When an element or layer is referred to as “on” or “on” another element or layer, it refers not only to being directly on top of another element or layer, but also to having another element or layer in between. Includes all. On the other hand, when an element is referred to as “directly on” or “directly on”, it indicates that there is no intervening element or layer. “And/or” includes each and every combination of one or more of the mentioned items.

Spatially relative terms such as “below”, “beneath”, “lower”, “above”, “upper”, etc. are used as a single term as shown in the drawing. It can be used to easily describe the correlation between elements or components and other elements or components. Spatially relative terms should be understood as terms that include different directions of the element during use or operation in addition to the direction shown in the drawings. Like reference numerals refer to like elements throughout the specification.

Embodiments described herein will be explained with reference to plan and cross-sectional views, which are ideal schematic diagrams of the present invention. Accordingly, the form of the illustration may be modified depending on manufacturing technology and/or tolerance. Accordingly, embodiments of the present invention are not limited to the specific form shown, but also include changes in form produced according to the manufacturing process. Accordingly, the regions illustrated in the drawings have schematic properties, and the shapes of the regions illustrated in the drawings are intended to illustrate a specific shape of the region of the device and are not intended to limit the scope of the invention.

Hereinafter, in order to explain the present invention in more detail, embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

Figure 1 is a perspective view showing the structure of a deck plate system for a hollow slab according to an embodiment of the present invention.

First, the overall structure of the deck plate system for hollow slabs according to an embodiment of the present invention will be briefly described with reference to FIG. 1, and each component will be described in detail in the drawings below.

Referring to FIG. 1, the deck plate system 1 for a hollow slab according to an embodiment of the present invention basically includes a deck plate 10 including a truss girder 100 and a steel plate 200.

The truss girder 100, for example, has two lower chords (110 in FIG. 2) that act as the main tension reinforcement of the slab, one upper chord (120 in FIG. 2) that acts as a compression reinforcement, and the one upper chord And it may be composed of a triangular truss girder including a lattice (130 in FIG. 2) that integrally fixes the two lower chords and plays the role of a shear connector. The lattice may be fixed to the upper and lower chords by welding. The truss girder 100 is arranged to be placed on the steel plate 200, and specifically, the lower chord of the truss girder 100 is arranged to be supported by the steel plate 200.

Meanwhile, in existing deck plates, the top chord of the truss girder is generally configured to function and serve as a main bar, but in the deck plate system for hollow slabs of the present invention, the top chord of the truss girder functions as a main bar as follows. One feature is that it replaces the main bars of the wire mesh, which will be explained later, and thus it is possible to make the diameter of the upper chord small. Therefore, according to an embodiment of the present invention, the diameter of the upper chord of the truss girder may be smaller than the lower chord. This is explained in more detail in the drawings below.

In one embodiment, the deck plate 10 may be formed as an integrated piece by welding and fixing the truss girder 100 to the steel plate 200. The method of welding the truss girder 100 to the steel plate 200 can be implemented in various forms. For example, as shown in FIG. 1, the steel plates 200 are formed in pairs at regular intervals in the width direction so that protrusions on the steel plates can support the truss girders 100, and the truss girders 100 ) may be extended and formed to support the longitudinal direction. The shape of the protrusion may be implemented in various forms and is not limited to the shape shown in the drawings in the embodiment of the present invention. The steel plate 200 is located below the truss girder 100 and serves to support the truss girder 100. The steel plate 200 is made of, for example, metal.

In this embodiment, an integrated deck in which the truss girder 100 is welded on a steel plate 200 is described as an example, but in other embodiments, the truss girder 100 and the steel plate 200 may be formed as a demold rather than as an integrated type. , in this case, a spacer may be further included between the truss girder and the steel plate. In the demold deck plate method, it is common to use a deck plate, spacer, and insert as the basic structure. The deck plate is made of plywood or steel plate and screwed together with an insert to be demolded, and the spacer is a component that separates the reinforcing bars from the formwork and is used alone at one point. 'Independent spacers' that support reinforcing bars and 'bar spacers' that have length members on which multiple reinforcing bars are placed are possible, and the inserts can play a role in supporting pedestals, etc. In addition, an insert spacer that integrates the insert and the space is also possible, which improves constructability and workability and reduces material costs.

The deck plate 10 used in the deck plate system for hollow slabs according to the present invention can be applied regardless of the type, such as an integrated deck or a demold deck, and there is no limitation to the various forms and types of each integrated or demold deck.

Meanwhile, in FIG. 1, the longitudinal direction of the truss girder 100 is defined as the first direction or the main direction, and the width direction in which the plurality of truss girders 100 are arranged is defined as the second direction or the main direction.

The truss girder 100 is configured to extend long in the first direction. The truss girder 100 may also be composed of a plurality of truss girders 100 at regular intervals in the second direction on the steel plate 200. The spacing or number of truss girders 100 may be configured in various ways.

In addition, the deck plate system for a hollow slab according to an embodiment of the present invention includes a truss girder 100 and a hollow body 300 disposed between the truss girder 100. The hollow body 300 has a generally circular cross-section and may be configured as a pipe extending along a first direction, which is the longitudinal direction of the truss girder. For example, the hollow body 300 may be made of synthetic resin or metal, but there is no limitation on the material.

The hollow body 300 corresponds to a component for the lightweight effect of the deck plate system for hollow slabs of the present invention. When concrete is buried on the deck plate 10 of the present invention, the portion of the hollow body 300 serves to allow the concrete to flow along the exterior of the hollow body without being buried. In other words, the amount of concrete can be reduced by the volume of the hollow body 300, which serves to reduce its own weight. Meanwhile, a rigid rib 310 may be formed on the exterior of the hollow body 300 to ensure rigidity so that it does not break under a working load and to fix the wire mesh disposed on the hollow body. According to one example, the rigid rib may be formed in a spiral shape on a hollow body, and there are no restrictions on the shape and manufacturing method of the rigid rib.

In the hollow body 300 according to an embodiment of the present invention, the upper part of the hollow body is disposed at a position higher than the top chord of the truss girder. That is, when viewed in the height direction, the hollow body 300 is higher than the upper chord of the truss girder, unlike the existing hollow body located between the steel plate 200 and the upper chord of the truss girder 100. It is a characteristic. With this configuration, there is no need to inefficiently increase the height of the truss girder, thereby reducing the weight of the deck plate and increasing work and construction efficiency.

Shear stoppers 350 are formed at both ends of the hollow body 300. The shear stopper 350 has a structure that can be fastened to the hollow body 300 in various ways, such as being inserted into both ends of the hollow body 300. Both ends of the hollow body 300 are closed by the shear stopper 350, so that the interior of the hollow body 300 can be maintained in an empty state when buried in concrete. One characteristic of the shear stopper 350 according to an embodiment of the present invention is that it has a tapered shape with gradually tapering ends, through which the shear area of the end of the hollow slab can be increased.

A wire mesh 400 is disposed on the hollow body 300. The wire mesh 400 is configured in the form of a grid (mesh) extending in plural numbers in each of the first and second directions, and a commonly used factory-made wire mesh may be used. The wire mesh 400 basically serves as a stepping stone for the worker during work.

The wire mesh 400 according to an embodiment of the present invention includes a plurality of main bars extending in a first direction and a plurality of reinforcement bars extending in a second direction. The main bars of the wire mesh extending in the first direction may function as main bars in the present invention, and the reinforcement bars of the wire mesh extending in the second direction may serve as reinforcement bars (temperature reinforcement) in the present invention. Accordingly, the wire mesh 400 of the present invention can shorten the construction period by reducing the on-site reinforcement, and can also cooperate with the injury-prevention shear muscles to perform the role of preventing injury of the hollow body 300 disposed below the wire mesh 400. It is structured so that

The injury prevention shear muscle 500 is configured to be coupled between the truss girder 100 and the wire mesh 400. Specifically, the anti-float shear bar 500 is configured such that the lower part is coupled to the top chord of the truss girder and the upper part is coupled to the main bar of the wire mesh. According to one embodiment, the anti-float shear bar 500 has a hook shape and can be formed to be fixed by being caught on the upper chord of the truss girder and the main bar of the wire mesh. However, the shape of the anti-float shear bar 500 can be configured in various ways, as long as it can be stably fixed to the truss girder and wire mesh described above. According to one embodiment, in one truss girder 100, a plurality of anti-float shear bars 500 may be arranged at regular intervals along the first direction, and each of the plurality of truss girders 100 may have a plurality of anti-float shear bars 500. Therefore, they can be arranged with the same relative position.

The anti-float shear bar 500 functions to fix the truss girder and the wire mesh, thereby preventing the hollow body located between them from rising when concrete is poured, and also serves to prevent the shear bar of the slab (for structural purposes) after curing. ) can perform its role. In addition, the hollow body 300 of the present invention is characterized in that there is no need to inefficiently increase the height of the truss girder by having the upper part located at a higher position than the top chord of the truss girder. To make this possible, The injury prevention shear bar 500 is configured to combine the top chord 120 of the truss girder and the main bar of the wire mesh.

Anti-sinking reinforcing bars 600 are formed at the lower part of the hollow body 300 between the plurality of truss girders 100. The anti-sink rebar 600 may be arranged between the plurality of truss girders 100 arranged in the second direction in such a way that it is supported on the lower chord 110 of the truss girder. The anti-sink reinforcing bar 600 may be composed of a lower reinforcing bar extending in a first direction and a support portion extending in a second direction. The anti-settlement reinforcing bar 600 is disposed at the lower part of the hollow body 300 between the truss girders to prevent settlement of the hollow body, and can also form an additional lower reinforcing bar to act as a main reinforcing bar for the positive moment of the slab.

In this way, the deck plate system 1 for a hollow slab according to an embodiment of the present invention has tapered shear plugs 350 at both ends of the hollow body 300, and between the plurality of truss girders 100. Since it has a characteristic configuration such as anti-sinking reinforcing bars 600, this will be described in more detail below.

In the drawings below, the characteristics of each component will be described in more detail. Duplication with the above-described content will be minimized, and the description will focus on the characteristic details and effects of the present invention compared to existing deck plates.

Figure 2 is a perspective view showing the components of the deck plate in the deck plate system for hollow slabs according to an embodiment of the present invention.

The deck plate 10 consists of a truss girder 100 disposed on a steel plate 200, and is not significantly different from the configuration of an existing deck. The steel plate and the truss girder may be welded as one piece, and in some cases, it is also possible to use a spacer, etc. between the steel plate and the truss girder to form a demold deck plate.

Each truss girder 100 follows a general configuration including a lower chord 110, an upper chord 120, and a lattice 130 that integrally fixes the upper chord and the lower chord. However, in the existing truss girder, the top chord functions and acts as a slab main bar, but in the present invention, the main bar of the wire mesh performs that role after the concrete hardens, so the top chord (120) of the truss girder 100 of the present invention ) is characterized by the ability to form a smaller diameter than before. In other words, the upper current 120 of the present invention can be minimized to be used only for temporary purposes.

Meanwhile, in one embodiment of the present invention, a long span deck plate having a length of the truss girder 100 in the first direction of approximately 6 m or more can be used. In particular, in the case of long-span deck plates that use truss girders that are longer than existing truss girders, there is a problem that constructability is significantly reduced as the load increases. In order to solve this problem, in the present invention, the truss girder itself minimizes the diameter of the top chord 120, reduces the weight by lowering the height of the truss girder, and uses hollow bodies, shear plugs, wire mesh, and flotation to reduce the total load after concrete burial. This problem can be solved by using components of anti-shear bars and anti-settlement bars. In addition, since the main bar direction reinforcement of the wire mesh replaces the role and function of the existing upper main bar, there is no need to increase the height of the truss girder itself, that is, there is no need to configure the lattice high, resulting in a reduction in the weight of the lattice. As a result, the weight of the truss girder can be minimized.

Figure 3 is a perspective view showing the components of the hollow body and the shear stopper in the deck plate system for hollow slabs according to an embodiment of the present invention, Figure 4 is an enlarged perspective view of the shear stopper portion of Figure 3, 5 is a cross-sectional view showing the central section of the hollow body of FIG. 3, and FIG. 6 is a side view of FIG. 3.

Referring to FIGS. 3 to 6, the hollow body 300 according to an embodiment of the present invention is configured in the form of a pipe that has a circular cross-section and extends in the longitudinal direction. The longitudinal direction extends along the first direction, which is the longitudinal direction of the truss girder, and thus is arranged substantially parallel to the truss girder 100, and the hollow body 300 is arranged between the plurality of truss girders.

This is because the hollow body 300 is a component for the lightweight effect of the hollow deck plate system of the present invention, and therefore, when concrete is buried in the hollow deck plate system of the present invention, the hollow body 300 portion is It serves to allow the concrete to flow along the exterior of the hollow body rather than being buried. In other words, the volume of the hollow body 300 can reduce the total amount of concrete buried, thereby reducing its own weight. Meanwhile, referring to FIGS. 5 and 6, ribs 310 are formed on the exterior of the hollow body 300 in order to minimize the weight of the hollow body 300 itself and ensure rigidity so as not to be damaged under the working load. It can be. The ribs 310 may also serve to secure a step that secures the wire mesh disposed on the hollow body. That is, the strength muscle extending in the second direction of the wire mesh 400 disposed on the hollow body 300 can be properly seated and fixed in the groove between the ribs 310. The interior of the hollow body 300 is preferably empty.

The shear stopper 350 has a structure that can be fastened to the hollow body 300 in various ways, such as being inserted into both ends of the hollow body 300. As an example, the shear stopper 350 may be inserted into the hollow body 300 by pushing it, or may be inserted into the hollow body 300 by screwing it in. In addition, the hollow body 300 and the shear stopper 350 may be coupled by additional coupling elements such as clips, nails, and screws, and there is no limitation to the method or form of coupling.

Both ends of the hollow body 300 are closed by the shear stopper 350, so that the interior of the hollow body 300 can be maintained in an empty state when buried in concrete. One characteristic of the shear stopper 350 according to an embodiment of the present invention is that it has a tapered shape with gradually tapering ends, through which the shear area of the end of the hollow slab can be increased.

Figure 7 is a perspective view showing the shape of the shear stopper according to the first embodiment in the deck plate system for hollow slabs according to an embodiment of the present invention.

Referring to FIG. 7, the shear stopper 350 according to an embodiment of the present invention has a tapered shape with gradually tapering ends.

The shear stopper 350 according to the first embodiment includes a coupling part 351 coupled to the hollow body 300, a body part 352 forming the body of the shear stopper, and a converging part 353 forming the end of the shear stopper. ) can be composed of.

The coupling portion 351 of the shear stopper 350 may have various binding methods and shapes to achieve appropriate coupling with the hollow body 300. To this end, the coupling portion 351 and the body portion 352 may be formed with a step, but are not limited thereto.

The shear stopper 350 according to the present invention has a tapered shape with gradually tapering ends. That is, the shear stopper 350 converges from the body portion 352 toward the converging portion 353 so that the end gradually becomes thinner, as shown in FIG. 7, and the converging portion 353 may be formed to form one line. . The shear stopper according to the first embodiment is tapered to have a line convergence portion 353 as shown in FIG. 7 .

The tapered form of the shear stopper 350 according to an embodiment of the present invention is such that when both end supports of the deck plate for a hollow slab are installed in the form of a simple point that is not rotationally constrained, the shear force is gradually maximized toward the ends. It is desirable that the end be tapered in proportion to the mechanical theory.

In a simple point-shaped structure where deflection control by flexibility is dominant, flexibility is maximized in the central part and deflection is large, so the concrete in the central part, which has a low mechanical contribution, is removed using the hollow body 300 to reduce self-weight. While deflection can be controlled through A method of securing structural strength against shear force is used by forming a solid cross-section by spacing them at a certain distance.

However, this method of securing the cross-sectional area by spacing out the hollow part may be vulnerable to structural durability due to the rapid cross-sectional change between the cross-section to which the hollow part is applied and the solid cross-section, causing stress concentration in the cross-sectional change area.

In the present invention, in response to the shear force that increases from the central part to the point through the shear stopper 350, a tapered cross-sectional shape is used to prevent sudden cross-sectional changes through a haunch-shaped cross-section to gradually secure the concrete cross-sectional area. The method is to avoid stress concentration and secure sufficient end shear strength.

Figure 8 is a perspective view showing the shape of the shear stopper according to the second embodiment.

If the first embodiment is a uniaxial tapered cross section in consideration of shear forces due to the vertical load of the slab, the second embodiment is a multiaxial tapered cross section in consideration of shear forces due to external forces in various directions. .

Referring to Figure 8, the shear stopper 360 according to another embodiment of the present invention also has a tapered shape with gradually tapering ends.

The shear stopper 360 according to the second embodiment is the same as the shear stopper 350 of the first embodiment, including a coupling portion 361 coupled to the hollow body 300, a body portion constituting the body of the shear stopper ( 362) and a convergent portion 363 constituting the end of the shear stopper.

The coupling portion 361 of the shear stopper 360 may have various binding methods and shapes to achieve appropriate coupling with the hollow body 300. To this end, the coupling portion 361 and the body portion 362 may be formed with a step, but are not limited thereto.

Like the first embodiment, the shear stopper 360 according to the second embodiment also has a tapered shape with a tapered end. As shown in FIG. 8, the shear stopper 360 of the second embodiment converges from the body portion 362 toward the converging portion 363 so that the end gradually becomes thinner, and the converging portion 363 is formed to form one point. It can be. That is, the shear stopper 360 of the second embodiment has a conical shape and is tapered to have a point convergence portion 353 as shown in FIG. 8.

Figure 9 is a perspective view showing components of the wire mesh in the deck plate system for hollow slabs according to an embodiment of the present invention, and Figure 10 is a front view of Figure 9.

Referring to FIGS. 9 and 10 , the wire mesh 400 according to an embodiment of the present invention is arranged in a grid shape on the hollow body 300. The wire mesh 400 basically corresponds to a component that serves as a stepping stone for the worker during work. The wire mesh 400 may be composed of, for example, iron wire or reinforcing bars.

The wire mesh 400 according to an embodiment of the present invention includes a plurality of main bars 410 extending in a first direction and a plurality of reinforcement bars 420 extending in a second direction. The main bars of the wire mesh extending in the first direction may function as main bars in the present invention, and the reinforcement bars of the wire mesh extending in the second direction may serve as reinforcement bars (temperature reinforcement) in the present invention. In addition, in the present invention, since the hollow body 300 of relatively low weight and strength is disposed under the wire mesh 400, it plays the role of preventing injury by preventing the hollow body 300 from rising during the concrete pouring operation. . In addition, the anti-float shear bar, which will be described below, helps to combine with the top chord 120 of the truss girder and the main bar 410 of the wire mesh so that the hollow body does not rise when pouring concrete. As a result, the anti-float shear muscle can also perform the role of the slab shear muscle after curing the concrete.

Figure 11 is a front view showing the components of the anti-float shear muscle in the deck plate system for hollow slabs according to an embodiment of the present invention.

Referring to FIG. 11, the shear muscle 500 may be composed of an upper part 510, a body part 520, and a lower part 530. The body portion 520 of the shear muscle may be configured in the form of a straight line in the vertical direction, and the upper portion 510 of the shear muscle may be configured to have an L shape bent at 90 degrees while being connected to the body portion 520, for example. You can. The lower part 530 of the shear muscle may be configured to have a hook shape bent at 180 degrees while being connected to the body portion 520. However, the shape of the shear bar is only an embodiment of the present invention, and the shear bar 500 can be combined with the top chord 120 of the truss girder at the bottom and the main bar 410 of the wire mesh at the top. If it is a shape, various modifications are possible. Accordingly, in another embodiment of the present invention, although not shown, the upper part 510 of the shear muscle may be connected to the body part 520 like the lower part 530 and may be configured to have a hook shape bent at 180 degrees.

Figure 12 is a perspective view showing the components of anti-settlement reinforcing bars in the deck plate system for hollow slabs according to an embodiment of the present invention, and Figure 13 is an anti-settlement reinforcing bar according to an embodiment of the present invention is a steel plate and a truss. It is a perspective view showing placement on a girder, and FIG. 14 is a front view of FIG. 13.

Referring to FIGS. 12 to 14, the anti-sink rebar 600 according to an embodiment of the present invention is configured at the lower part of the hollow body 300 between the plurality of truss girders 100. The anti-sink rebar 600 may be arranged between the plurality of truss girders 100 arranged in the second direction in such a way that it is supported on the lower chord 110 of the truss girder.

Referring to FIG. 12, the anti-sink reinforcing bar 600 may be composed of a lower reinforcing bar portion 610 extending in a first direction and a support portion 620 extending in a second direction. As shown in FIG. 13, the lower reinforcing bar portion 610 is configured to extend along the main beam direction, which is the first direction, and the support portion 620 extends along the reinforcing bar direction, which is the second direction, to support the lower part of the neighboring truss girder. The anti-sink rebar 600 is configured to span the current 110. Accordingly, the anti-sink rebar 600 may be arranged to be supported on each lower chord 110 of two neighboring truss girders 100.

The lower reinforcing bar portions 610 of the anti-sinking reinforcing bars 600 may be formed in pairs, for example, but there is no limit to the number and may be configured in various ways. Accordingly, the lower reinforcing bar portion 610 constitutes an additional lower reinforcing bar at substantially the same height level as the lower chord 110 of the truss girder, so that it can act as a main reinforcing bar for slab positive moment.

Meanwhile, the anti-sinking reinforcing bar 600 is supported and disposed on the lower chord 110 of the truss girder by the support portion 620, thereby supporting the hollow body 300 disposed on the anti-sinking reinforcing bar 600, It can simultaneously perform the role of preventing sinking of hollow bodies. In other words, when buried in concrete, the hollow body 300 can play a role in preventing sinking due to construction loads such as concrete, equipment and personnel loaded during construction.

Meanwhile, in the structure of the anti-sink reinforcing bar 600 shown in FIGS. 12 to 14, the lower reinforcing bar portion 610 is located at the lower part of the support portion 620, but in another embodiment, the lower reinforcing bar portion 610 is located at the lower portion of the support portion 620. ) may be configured to be located at the upper part of the lower reinforcing bar part 610, and therefore the position of the lower reinforcing bar part 610 with respect to the support part 620 is not limited to the lower part or the upper part and can be applied in all cases.

According to one embodiment of the present invention, the support portion 620 of the anti-sink rebar 600 may have a curved end of the support portion as shown in FIG. 14. Through this, the anti-sink rebar 600 can be placed more stably when placed on the lower chord 110 of the truss girder.

Meanwhile, a plurality of the support portions 620 may be arranged at regular intervals in the longitudinal direction of the lower reinforcing bar portion 610 in one anti-sink reinforcing bar 600. The number and spacing of the supports 620 installed on one anti-sink reinforcing bar 600 can be configured in various ways, which means that the anti-sinking reinforcing bar 600 placed on the lower chord 110 of the truss girder is placed on it. The number and spacing of the disposed hollow bodies 300 can be set and arranged so that they can properly perform the role of preventing sinking.

Figure 15 is a front view of a deck plate system for hollow slabs according to an embodiment of the present invention.

Referring to FIG. 15, a hollow body 300 is disposed between a plurality of truss girders 100 aligned in the second direction. Anti-sinking reinforcing bars 600 are disposed on the lower chord 110 of the truss girder 100, and accordingly, when viewed in the second direction, anti-sinking reinforcing bars 600 and a hollow body are formed between the truss girders 100. It is arranged so that (300) is placed.

As shown in FIG. 15, the anti-settlement rebar 600 serves to prevent the hollow body 300 from sinking due to concrete and other construction loads when buried in concrete. In addition, the anti-settlement reinforcing bar 600 not only plays a role in preventing settlement of the hollow body 300, but the lower reinforcing bar portion 610 constitutes an additional lower reinforcing bar and serves as the main reinforcing bar for the slab positive moment, and the support portion 620 ) helps the anti-sink rebar 600 to be stably supported on the lower chord 110 of the truss girder.

Meanwhile, the main bars and reinforcement bars of the wire mesh 400 according to the present invention are formed in a grid shape with regular intervals, and in particular, the main bars 410 of the wire mesh 400 are formed by a plurality of truss girders 100 as shown in FIG. 15. It may be formed at intervals to align with the upper currents 120 of . That is, the plurality of main bars 410 of the wire mesh may be formed to have a gap at least aligned with the top chord 120 of the truss girder.

For example, the spacing between the plurality of main bars 410 of the wire mesh 400 may be the same as the spacing between the top chords 120 of the plurality of truss girders. As another example, as shown in FIG. 15, the spacing between the plurality of main bars 410 of the wire mesh 400 may be equal to half the spacing between the top chords 120 of the plurality of truss girders. In this case, the plurality of main bars 410 of the wire mesh will be arranged to alternately align with the top chord 120 of the truss girder - the center of the hollow body 300 - the top chord 120 of another truss girder.

Additionally, according to another embodiment, the spacing between the plurality of main bars 410 of the wire mesh 400 may vary. For example, when the spacing becomes smaller, there may be at least one more bar between the top chords of the truss girder and the top chords of the truss girder. It may be designed so that many main bars 410 are arranged. However, even in this case, the main bars 410 of the wire mesh aligned with the upper chords 120 of the plurality of truss girders will be aligned so that they necessarily exist. Meanwhile, the reinforcement bars 420 of the wire mesh may be aligned at regular intervals, and the regular intervals may be different from the spacing of the main bars 410 of the wire mesh.

When the hollow body 300 is disposed as shown in FIG. 15, no concrete is buried in the hollow body 300 when concrete is buried, so there is an effect of reducing the amount of concrete buried by the volume of the hollow body 300. have

Both ends of the hollow body 300 are closed by the shear stopper 350, so that the interior of the hollow body 300 can be maintained in an empty state when buried in concrete. One characteristic of the shear stopper 350 according to an embodiment of the present invention is that it has a tapered shape with gradually tapering ends, through which the shear area of the end of the hollow slab can be increased. The shape of the shear stopper 350 may be in the form of Figure 7, where the end forms a converging part with a straight line, or it may be in the form of Figure 8, where the end forms a point converging part and has a cone shape.

In the hollow body 300 according to an embodiment of the present invention, the upper part of the hollow body is disposed at a position higher than the top chord of the truss girder. Additionally, the center position of the hollow body may be placed at a higher position than the top chord of the truss girder. That is, when viewed in the height direction, the hollow body 300 is higher than the upper chord 120 of the truss girder, unlike the existing hollow body located between the steel plate 200 and the upper chord of the truss girder 100. Its characteristic feature is that it is raised. With this configuration, there is no need to inefficiently increase the height of the truss girder, thereby reducing the weight of the deck plate and increasing work and construction efficiency. To make this possible, the anti-float shear bar 500 is configured to couple the top chord 120 of the truss girder and the main bar 410 of the wire mesh.

The hollow body 300 may be placed on the anti-settlement rebar 600 and placed in contact with the anti-sink rebar 600. Accordingly, the anti-sinking reinforcing bar 600 performs the function of preventing sinking of the hollow body 300.

As the wire mesh 400 is disposed on the hollow body 300, it serves to prevent the relatively light hollow body 300 from floating.

The anti-float shear bar 500 has a lower part coupled to the top chord of the truss girder and its upper part coupled to the main bar of the wire mesh, thereby fixing the truss girder and the wire mesh and preventing the hollow body 300 from floating. Perform.

For this purpose, the plurality of main bars 410 of the wire mesh are formed with an interval such that they are at least aligned with the top chord 120 of the truss girder, and have a structure connected through the anti-float shear bar 500. .

In addition, through this structure, the body of the shear bar can play the role of the shear bar of the slab after curing the concrete, and thus, by replacing the role of the top chord of the existing truss girder, the diameter of the top chord is reduced, thereby reducing the weight. In addition, since there is no need to increase the height of the truss girder itself, the weight of the lattice can also be reduced, and as a result, the weight of the truss girder itself can be reduced. Accordingly, the diameter of the upper chord of the truss girder may be formed to be smaller than the diameter of the lower chord.

Therefore, even if a truss girder for a long span is manufactured, it is lighter than the existing truss girder, and even if a truss girder for a long span of 8 m or longer is actually used, lifting equipment is not required, so field constructability is excellent.

The above detailed description is illustrative of the present invention. Additionally, the foregoing merely shows and describes preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, changes or modifications are possible within the scope of the inventive concept disclosed in this specification, the scope equivalent to the written disclosure, and/or the skill or knowledge in the art. The above-described embodiments are intended to explain the best state for carrying out the present invention, and are used in other states known in the art to use other inventions such as the present invention, and are required in the specific application field and use of the invention. Various changes are also possible. Accordingly, the above detailed description of the invention is not intended to limit the invention to the disclosed embodiments. Additionally, the appended claims should be construed to include other embodiments as well.

Claims (16)

A deck plate including a steel plate and a triangular truss girder extending in a first direction on the steel plate and arranged in a plurality in a second direction perpendicular to the first direction, and having one upper chord and two lower chords;
a hollow body having a circular cross-section and disposed between the plurality of triangular truss girders along the first direction;
a wire mesh disposed on the hollow body;
An anti-float shear muscle consisting of an upper part, a body part, and a lower part, and connecting the wire mesh and the triangular truss girder; and
Shear plugs coupled to both ends of the hollow body; Includes,
The wire mesh is configured in a grid shape with a plurality of main bars extending in the first direction and a plurality of reinforcement bars extending in the second direction, and the main bars of the wire mesh serve as main bars of the deck plate,
The upper part of the anti-float shear muscle is coupled to the main bar of the wire mesh, and the lower part of the flotation-prevention shear muscle is coupled to the top chord of the triangular truss girder,
The center position of the hollow body is disposed at a higher position than the top chord of the triangular truss girder,
The shear stopper is a deck plate system for a hollow slab, characterized in that it has a tapered shape with a tapered end. According to claim 1,
The shear stopper is,
A coupling portion coupled to the hollow body;
A body portion constituting the body of the shear stopper; and
A converging portion constituting the end of the shear stopper; Deck plate system for hollow slabs consisting of. According to claim 2,
A deck plate system for a hollow slab, characterized in that the convergence part of the shear stopper is a line convergence part. According to claim 2,
A deck plate system for a hollow slab, characterized in that the convergence part of the shear stopper is a point convergence part. According to claim 1,
A deck plate system for a hollow slab, characterized in that it further comprises anti-sink reinforcing bars disposed in the lower part of the hollow body, between the plurality of truss girders arranged in the second direction, in a manner supported on the lower chord of the truss girder. According to claim 5,
The anti-sink reinforcing bar includes a lower reinforcing bar extending in the first direction; And a deck plate system for a hollow slab consisting of a support part extending in the second direction and arranged to be supported on each lower chord of two neighboring truss girders. According to claim 6,
A deck plate system for a hollow slab, characterized in that the support portion of the anti-sink rebar has a curved end. delete According to claim 1,
The deck plate is a deck plate system for a hollow slab, characterized in that the deck plate is integrated or demold. delete According to claim 1,
A deck plate system for a hollow slab further comprising rigid ribs on the exterior of the hollow body. delete According to claim 1,
A deck plate system for a hollow slab, characterized in that the plurality of main bars of the wire mesh are formed with an interval such that they are at least aligned with the top chord of the truss girder. According to claim 1,
At least one of the upper and lower portions of the injury prevention shear muscles has a hook shape,
A deck plate system for a hollow slab, characterized in that the body portion of the injury prevention shear muscle has a straight vertical shape. delete delete