KR101118257B1 - Deck for concrete slab construction - Google Patents

Abstract

PURPOSE: A deck for placing concrete slab is provided to prevent crack and reflective crack due to the concentration of stress by load intensively applied the upper part of slab. CONSTITUTION: A deck for placing concrete slab comprises a body(110), a projected unit, a horizontal reinforcing bar(140), and a longitudinal reinforcing bar(150). The body comprises a plurality of grooves(111), a reinforcing rib(113), and an anti-crack slope(115). The grooves are horizontally spaced and are formed to be recessed upward by a given length in a longitudinal direction. The reinforcing rib is protruded between the grooves in a longitudinal direction. The anti-crack slope is formed on both sides of the body to downward slop outward to below the inner height of the groove.

Description

Deck for concrete slab pouring {DECK FOR CONCRETE SLAB CONSTRUCTION}

The present invention relates to a deck for placing concrete slabs, and more particularly, to form a crack-proof inclined surface on the butt side, which is the side of the deck body, to a length greater than or equal to the bottom side of the deck body, thereby eliminating local cross-sectional reduction at the butt portion. This prevents reflection cracks leading from the butt to the upper part after placing concrete on the upper surface of the deck, while filling grooves are formed in the lower part before and after the deck body to fill the concrete into the filling groove by self weight when placing the upper concrete. The present invention relates to a concrete slab casting deck that allows the deck body to be firmly fixed to the upper surface of the girder without any mortar work for installing the deck.

In general, the structure of bridges is a space between a plurality of bridges installed on the ground at regular intervals, and horizontally spaced girder and each adjacent girder to reinforce the deflection of the girders in parallel in a horizontal direction. It consists of a cross beam and a slab disposed on the top of the girder formed in the orthogonal direction at regular intervals.

The girder as described above is manufactured to be able to withstand the stress caused by the vertical pressure, such as the weight of the slab and its own weight by embedding reinforcing bars or steel wires.

In addition, in order to construct a slab corresponding to the upper work of the bridge, after the formwork is installed between the girders, the concrete is poured on the upper part and then the formwork is dismantled. Thus, when installing the slab on the upper part of the bridge to install the formwork and the working scaffold to cure the slab concrete, there is a problem in the construction because there is a fixed phase to remove the formwork used therein.

Therefore, recently, panels for replacing slab formwork have been used to improve the workability by improving the workability and shortening the air by supplementing the problems as described above. This panel is a slab deck for concrete slab placing the truss girder and reinforcing bars longitudinally and horizontally by using the facilities provided in the factory, and then cast the concrete to cure the panel.

1 is a front sectional configuration diagram showing the construction state of the concrete slab casting deck according to the prior art, Figure 2 is a side cross-sectional configuration diagram showing the construction state of the concrete slab casting deck according to the prior art.

As shown in Figures 1 and 2, the deck 10 for placing concrete slab according to the prior art is fixed to the upper and rear ends of the girder 20 is fixed to the top of the pier 30 arranged in a fixed interval arranged Truss girders 13 are installed in the longitudinal direction at regular intervals so that a portion thereof is exposed to the upper surface and transverse reinforcing bars 14 installed in the transverse direction orthogonal to the longitudinal direction of the truss girder 13, the transverse direction With the configuration of the deck body 11 to form a plate panel through the reinforcement of the reinforcing bars (14) perpendicular to the longitudinal reinforcing bars 15, such as the truss girder (13) and curing by pouring concrete Is done.

At this time, the reinforcing rib (11a) is formed to protrude from the lower portion of the deck body 11, which is the lower side of the truss girder (13).

As described above, the deck 10 for placing concrete slabs having a structure in which a reinforcing rib 11a protrudes from the bottom of the deck body 11, which is the lower side of the truss girder 13, is the same as the truss girder 13. In the longitudinal direction, the longitudinal reinforcing bars 15 are also disposed in the longitudinal direction of the reinforcing ribs 11a.

Concrete slab casting deck 10 according to the prior art configured as described above is arranged on the upper surface of the girder 20 seated and fixed on the top of the pier 30 is fixed by pouring concrete.

Referring to FIG. 1, in the case of applying a panel, that is, a concrete slab placing deck 10 in a civil engineering slab structure, an effective cross-section (E) as a composite structure in which the upper concrete placing surface including the deck 10 is integrally integrated. Is interpreted as

Here, the part where the deck 10 and the deck 10 contact each other is substantially separated by a predetermined gap, and is in the form of a cross-sectional reduction having a partial cross-sectional loss L, that is, the side of the deck body 11. In the butt joint portion where a is in contact with each other, it becomes an effective section e reduced by the cross-sectional loss (L).

Therefore, the deck 10 and the deck 10 are in contact with each other because the effective cross-section (e) has a reduced cross section, which is vulnerable to tensile force. There was a problem that the subsequent reflection crack occurs.

Due to the occurrence of such reflection cracks there is a problem that the durability of the concrete slab structure is significantly reduced.

Moreover, reflection cracks in concrete slab structures penetrate rainwater, dirt and calcium chloride to accelerate the corrosion of internal reinforcing bars, accelerate the deterioration of concrete slab structures, and shorten the life of bridges. Maintenance and reconstruction of concrete slab structures is required.

On the other hand, referring to Figure 2, the deck 10, the front and rear end of the deck 10 spans a certain width between the girder 20 and the girder 20.

In this case, the adhesive 21a is applied to the upper surface of the end side of the girder 20 by a predetermined distance in the longitudinal direction with respect to the width spanning the front end and the rear end of the deck 10, and then the adhesive 21a. Adhesively fixed to the packing 21 on the upper surface of the girder 20 is applied.

Then, the first application of the cement mortar (M1) immediately next to the packing 21, and then mounted on the deck 10, the upper surface of the girder 20 and the mounting surface of the deck 10 The installation work of the deck 10 is completed by additionally filling the cement mortar (M2), which is applied while the workers are filling the cement mortar (M2) one by one in order to fill the gaps formed in the container.

In the installation work of the deck 10 as described above, the theoretically applied cement mortar (M2) applied by manpower has been shifted to the type of work that expects the role of preventing and firmly supporting the flow of the deck 10, cement Due to the reduction of the mortar strength and the limitation of the skilled construction, it is difficult to firmly adhere the front and rear ends of the deck body 11 to the girder 20.

In order to solve the above problems, the present invention extends the downward inclined surface of the butt portion to a height that is less than the effective cross section of the entire slab in order to prevent local cross-sectional reduction of the deck and the side abutment portion of the deck in the future slab top It is an object of the present invention to provide a concrete slab casting deck that can prevent cracks and reflection cracks caused by stress concentration caused by weighted loads.

In addition, the technology according to the present invention has a predetermined height in the front and rear ends of the deck body is formed in the depression recessed inwards when the concrete is poured into the filling groove during the construction of the concrete slab automatically filled by the weight of the conventional manpower The purpose is to reduce the filling and coating process and to firmly adhere the front and rear ends of the deck body to the top of the girder.

The present invention for achieving the above object is as follows. That is, the deck for concrete slab casting according to the present invention is fixed to the upper and rear ends of the deck girder that is fixed to be arranged at a predetermined interval on the top of the pier, the deck main body, the upper part of the deck body is formed through the casting of concrete Protruding body is arranged at a predetermined interval in the transverse direction so as to expose a part of the furnace to extend in the longitudinal direction, transverse reinforcing bars installed in the transverse direction orthogonal to the longitudinal direction of the truss girder and orthogonal to the transverse reinforcing bars In the concrete slab casting tech consisting of a longitudinal reinforcing reinforcing bar reinforced in the longitudinal direction, such as the truss girder, the deck body is spaced apart in the longitudinal direction in the longitudinal direction to be vertically spaced apart in the vertical direction A plurality of grooves are formed to form a reinforcing rib projecting in the longitudinal direction between the grooves On the other hand, it is possible to prevent cracking caused by stress concentration due to the weighting load on the upper part of the concrete slab due to the local cross-sectional reduction at the abutment part between the concrete slab placing decks adjacent to each other laterally after the construction of the concrete slab. It is composed of a configuration in which the crack preventing slope is formed to be inclined outwardly downward to below the inner surface height of the groove, which is the lower end of the effective cross section generated by the concrete pouring on both sides in the transverse direction.

Here, the deck body is filled with concrete at the mounting surface of the deck when the upper concrete slab is automatically filled by its own weight so that the front and rear end is fixed to the upper surface of the girder to have a predetermined height in the front and rear end is filled inwardly Preferably, a groove is formed.

In this case, the filling groove may be formed in the front and rear ends of the deck body by extending a predetermined length to both sides of the center with respect to the width direction to be recessed inwardly, or may be formed in a predetermined length inward over the entire width direction.

Moreover, the deck body is formed with a breakage preventing slope inclined downward inwardly by a certain height on both bottom edges of the transverse direction so as to prevent the breakage of the corner portion during transportation, while the groove is recessed in the shape of the downlighting narrower narrowed toward the top It is preferable that the recess is formed to have a recessed slope corresponding to the crack preventing slope.

On the other hand, the protrusion is preferably provided with a truss girder or a protruding muscle.

Referring to the effect of the concrete slab casting deck according to the invention as follows.

First, by forming a crack-proof slope that slopes downward to a height below the bottom of the effective section generated by concrete slab casting, local cross-sectional loss can be eliminated at the butt joint of the deck and laterally after construction of the concrete slab. It is possible to prevent cracks and reflection cracks caused by stress concentration due to the weighting load on the upper part of the concrete slab in the abutment part of the neighboring concrete slab casting deck.

Second, the filling groove is formed in the front and rear ends of the deck body with a certain height to be recessed inward, so that the concrete poured during the construction of the concrete slab is automatically filled in the filling groove by its own weight, thereby filling and applying the process by conventional manpower. The front and rear ends of the deck body can be firmly fixed to the upper surface of the girder.

1 is a front sectional view showing the construction state of the concrete slab casting deck according to the prior art.
Figure 2 is a side cross-sectional view showing a construction state of the concrete slab casting deck according to the prior art.
Figure 3 is a perspective configuration showing a deck for pouring concrete slab according to the present invention.
Figure 4 is a front cross-sectional view showing a deck for placing concrete slab according to the present invention.
Figure 5 is a front sectional view showing the state of construction showing the construction of the concrete slab casting deck according to the invention.
Figure 6 is a side cross-sectional view showing the use of the construction state of the concrete slab casting deck according to the invention.
Figure 7 is a perspective view showing another embodiment of the concrete slab casting deck according to the present invention.
Figure 8 is a perspective view showing another embodiment of the concrete slab casting deck according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the concrete slab casting deck according to the present invention.

Figure 3 is a perspective configuration showing a concrete slab casting deck according to the present invention, Figure 4 is a front sectional configuration showing a concrete slab casting deck according to the invention, Figure 5 is a concrete slab for pouring This is a front cross-sectional view showing the construction status of the deck.

6 is a side cross-sectional view showing a state of use of the construction of the concrete slab casting deck according to the invention.

As shown in Figures 3 to 6, the concrete slab casting deck 100 according to the present invention is fixed to the front and rear end seating on the upper surface of the plurality of girders (200) that is fixed to be arranged at a predetermined interval on the top of the piers (300) On the other hand, the deck body 110 is formed through the concrete pouring, the projecting body is disposed with a predetermined interval in the transverse direction so as to be exposed to the upper part of the deck body 110 is installed extending in the longitudinal direction, the protrusion The transverse rebar 140 installed in the transverse direction orthogonal to the longitudinal direction of the structure and the longitudinal reinforcing bars 150 are orthogonal to the transverse reinforcing bars 140 and are disposed in the same longitudinal direction as the protrusions. Is made of.

Here, the protruding member is preferably provided with a truss girder 130, and after the base wire 131 is disposed to form a triangular shape, the truss girder 130, each hypotenuse of the triangular shape of the base wire 131. A lattice bar 132 extending in a vertical zigzag shape is fixed to the portion.

At this time, the deck body 110 is formed with a plurality of grooves 111 which are spaced apart in the longitudinal direction on the lower surface and recessed upward by a certain length in the longitudinal direction, the longitudinal direction between the plurality of grooves 111 formed in this way The reinforcing ribs 113 protruding to be formed.

In addition, the deck body 110 is a stress concentration due to the load that is weighted on the upper portion of the concrete slab placed on the butting portion of the concrete slab placing deck 100 adjacent to each other laterally after the construction of the concrete slab In order to prevent cracks caused by the cracks inclined outwardly downward slope down to the height (H) of the inner surface of the groove 111, which is the lower end of the effective cross-section (E) generated by the concrete placing on both sides of the transverse direction It is preferable that 115 is formed.

As the crack preventing inclined surface 115 is formed on both sides of the deck body 110 in the lateral direction, it is possible to eliminate the local cross-sectional loss in the conventional butt joint portion, through which the concrete slab casting deck 100 Cracks caused by stress concentration due to the weighted load on the upper part of the concrete slab placed in the butt portion of the can be prevented, as well as reflection cracks caused by these cracks.

In other words, the crack preventing inclined surface 115 is formed on both sides of the deck body 110 in the lateral direction, while gently inclined downward toward the outside by a predetermined length from both sides of the deck body 110 in the lateral direction. Is formed.

At this time, the bottom height (h) of the crack preventing inclined surface 115 is preferably formed to be lower than or equal to the height (H) of the inner surface 111 of the groove 111 corresponding to the bottom of the effective cross-section (E) generated after the concrete installation. As a result, the effective cross section E due to the cross-sectional loss L can be prevented from being reduced in the conventional concrete slab casting deck 10.

That is, by preventing the effective section (E) from shrinking, the concrete slab placing deck 100 is fixed to the upper surface of the girder 200 of the piers 300 by arranging concrete, and then the concrete slab is constructed after the concrete slab is constructed. It is possible to prevent cracks occurring in the butt portion due to the stress concentration caused by the load applied to the upper surface. In addition, it is possible to prevent the cracks generated in the butt portion to prevent the reflection cracks to the upper surface of the concrete slab due to such cracks.

In detail, referring to Figure 5, the effective cross-section (E) generated after the construction of the concrete is an effective cross-section (E ') partially extended than the effective cross-section (E) other than the butt joint portion in the butt joint portion of the deck body 110. ) Can be applied.

In this case, the partially extended effective cross section E ′ is an effective cross section E ′ when the bottom height h of the crack preventing inclined surface 115 is formed to be lower than the height H of the inner surface 111 of the groove 111. .

Of course, when the bottom height h of the crack preventing inclined surface 115 is formed to be the same as the inner surface height H of the groove 111, the effective cross section identical to the effective cross section E of the groove 111 is formed. Will have (E).

As described above, the bottom height h of the crack preventing inclined surface 115 is formed to be lower than or the same as the height H of the inner surface of the groove 111, so that the effective joint portion of the deck body 110 is effective. The cross section may be formed of an effective cross section E 'which is partially extended from the effective cross section E' other than the butt joint portion, or the same effective cross section E. FIG.

Accordingly, the butt joint portion of the deck body 110 is formed to have the same or more effective cross sections (E, E ') than the effective cross section other than the butt joint portion, unlike the effective cross section (e) reduced due to the conventional cross-sectional loss. By minimizing the cross-sectional loss it is possible to prevent the cracks generated in the butt joint portion of the deck body (110).

In addition, it is possible to prevent the reflection crack from the crack generated in the butt joint portion of the deck body 110 to the upper surface of the concrete slab.

On the other hand, the concrete slab casting deck 100 is pre-fabricated in a facility such as a factory is used to be transported to the construction site, it is important to be able to prevent the corner portion is damaged during such transportation.

Therefore, the deck main body 110 of the concrete slab casting deck 100 is formed in the lower edge of the transverse direction inclined downward inclined downward to the inside by a certain height inclined surface 119 is formed.

In addition, the deck body 100 is preferably recessed in the shape of the lower recessed narrow narrowing toward the upper groove 111 formed on the lower surface, in particular inclined depression inclined surface corresponding to the crack prevention slope 115 It is preferable that the recesses are formed in the shape of the lower light reciprocation so as to have (112).

Concrete slab casting deck 100 according to the present invention as described above is formed with a plurality of grooves 111 and the reinforcement ribs 113 on the lower surface of the deck body 100, while preventing cracks on both sides in the transverse direction By making a haunch-type deck on which the inclined surface 115 is formed, the construction and the economic feasibility of the construction of the slab structure applied to the bridge can be applied as an advantageous method.

Here, the haunch type refers to a type generally applied to the floor surface in a bridge slab structure, and refers to a type of panel in which a lower surface is concave installed in a panel applied when a bridge slab structure is worked.

On the other hand, the deck body 110 is formed in the front and rear ends with a predetermined height is filled with a filling groove 117, the filling groove 117 is to both sides based on the center of the deck body 110. It may extend by a predetermined length and be formed recessed inward.

Here, the filling groove 117 may be formed to be inclined upwardly on both sides, that is, recessed in a predetermined length in a trapezoidal shape, of course, the corner portion may be formed in an inverted "U" shape of the corner.

Referring to the state in which the deck body 110 having the filling groove 117 is installed on the upper surface of the girder 200, first, the deck body 110 is between the girder 200 and the girder 200. The front and rear ends of the deck body 110 span a predetermined width.

Here, with respect to the width across the front end and the rear end of the deck body 110, the adhesive (not shown) is applied to the upper surface of the end side of the girder 200 spaced apart at regular intervals in the longitudinal direction.

In addition, after the adhesive 210 is fixed to the upper surface of the girder 200 to which the adhesive (not shown) is applied, the installation work of the deck 100 is completed by mounting the deck 100 thereon. Thereafter, concrete is poured to form the upper concrete slab.

As described above, the concrete poured during the construction of the concrete slab is filled in the filling groove 117 by its own weight, so that the front and rear ends of the deck body 110 can be firmly fixed to the upper surface of the girder 200. have.

Furthermore, referring to FIG. 2, the filling groove 117 is formed at the front and rear ends of the deck body 110 so that the cement mortar (near the side of the packing 21) in the conventional concrete placing deck 10 ( In order to fill the gap formed on the upper surface of the girder 20 and the mounting surface of the deck 10 and the second work force can be omitted to fill the cement mortar (M2) by the work force, accordingly By simplifying the process for installation and slab construction of the deck 200 can have the effect of improving the construction and shortening the construction period.

That is, the deck 100 for concrete slab pouring according to the present invention is reduced by the filling groove 117 is formed in the front and rear ends of the deck body 110 to apply and fill the cement mortar by the conventional work force By simplifying the process for the installation of the deck 200 and the slab construction can improve the workability, and can also shorten the construction period.

7 is a perspective configuration diagram showing another embodiment of the concrete slab casting deck according to the present invention.

First, the embodiment as shown in FIG. 7 has a difference only in the configuration of the charging grooves 117 and 117 ', which is the main part of the embodiment of the present invention described above with reference to FIGS. The configuration of the grooves 117 and 117 'will be mainly described, and reference numerals for the same components will be referred to together with FIGS. 3 to 6.

Concrete slab pouring deck (100 ') according to another embodiment of the present invention is formed in the front and rear ends of the deck body (110') is formed with a filling groove (117 ') recessed inwardly, the filling groove 117 'has a predetermined height at the front and rear ends of the deck body 110' and is formed to have a predetermined length inward with respect to the entire transverse direction.

The filling groove 117 ′ is formed at the front and rear ends of the deck body 110 ′ so that the concrete slab placing deck 100 ′ is joined to the front and back directions of the plurality of girders 200 by the concrete slab. The concrete poured during construction is pushed into the filling groove 117 'by its own weight to be cured so that the deck 100' may be firmly fixed to the upper surface of the girder 200.

Accordingly, the bottom surface of the concrete slab casting deck 100 ′ may be firmly fixed to the top surface of the girder 200.

8 is a perspective configuration diagram showing another embodiment of the concrete slab casting deck according to the present invention.

As shown in FIG. 8, the concrete slab placing deck 100 ″ is provided with the protrusion slab 130 ′ instead of the truss girder 130 with the concrete slab placing deck 100 described with reference to FIGS. 3 to 6. Since only the difference in configuration, the description of the same reference numerals will be omitted.

Referring to FIG. 8, the slab pour deck 100 ″ according to the present invention is disposed at regular intervals in the transverse direction so as to be partially exposed to the upper portion of the deck body 110 ″, and protrudes to be installed to extend in the longitudinal direction. As a protruding muscle 130 'is provided.

At this time, the protruding root 130 'is preferably provided in an inverted "U" shape, but may be provided as a protruding root having various shapes such as "I" shaped protruding root (not shown).

Although specific embodiments of the present invention have been described in detail above, the present invention is not limited thereto, and the present invention can be variously modified by those skilled in the art to which the present invention pertains. Is included in the scope of the present invention.

100, 100 ', 100 ": Deck 110, 110', 110": Deck Main
111: groove 112: recessed slope
113: reinforcing rib 115: crack prevention slope
117, 117 ': Filling groove 119: Slope to prevent damage
130: truss girder 131: base wire
132: lattice bar 140: transverse rebar
150: longitudinal rebar 200: girder
300: piers E, E ', e: effective cross section
H: Groove inner height h: Crack-inclined bottom height
L: section loss

Claims (5)

The front and rear ends are seated and fixed on the upper surface of the girder arranged at fixed intervals at the upper part of the pier, while the deck body is formed by placing concrete, and has a predetermined interval in the transverse direction so that a part of the deck body is exposed. A protruding body disposed to extend in the longitudinal direction, a transverse reinforcing bar installed in a transverse direction orthogonal to the longitudinal direction of the protruding body, and a longitudinal reinforcement perpendicular to the transverse reinforcing bar in the same direction as the protruding body In the structure consisting of a direction reinforcing reinforcement, while the protrusion is a truss girder or projecting reinforcement concrete slab,
The deck body has a plurality of grooves are formed in the lower surface in the horizontal direction spaced apart in the vertical direction by a predetermined length in the longitudinal direction is formed between the reinforcement ribs protruding to narrow down the cross-section between each groove, while the concrete slab After construction, local cross-sectional reduction at the abutment area between the concrete slab casting decks adjacent to each other in the lateral direction prevents cracking caused by stress concentration due to the weighting load on the upper part of the concrete slab. A crack preventing slope is formed to be inclined downward downward to below the inner surface height of the groove, which is a lower end of the effective cross section generated by the concrete pouring, and the recess is formed in the shape of a downlighting narrower narrowed toward the top, but the crack preventing slope is Recessed type to have a recessed slope corresponding to The deck body is recessed inwardly with a certain height at the front and rear ends so that the concrete is automatically filled by the weight of the deck when the upper concrete slab is placed so that the front and rear ends are firmly fixed to the upper surface of the girder. Filling grooves are formed, the filling grooves are formed in the front and rear ends of the deck body by a predetermined length to both sides with respect to the width direction in the center relative to the width direction to form a recess inward, or to form a predetermined length inward throughout the width direction On the other hand, the deck body is a concrete slab casting deck, characterized in that the damage prevention slope is formed to be inclined downward inwardly by a certain height in the lower side of both sides in the transverse direction so as to prevent the breakage of the corner portion during transportation. delete delete delete delete

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