KR101179442B1 - pc slab for one way joist slab and producing method of it - Google Patents

Abstract

PURPOSE: A PC slab for a one way floor joist slab and a method for manufacturing the same are provided to reduce manufacturing costs, to enhance productivity, and to easily construct. CONSTITUTION: A PC slab for a one way floor joist slab comprises an upper plate, a pair of lateral plates(130), a pair of lower plates, a downward space, an opening, a stop plate fitting portion(160), a stop plate(170), and a reinforcement member(180). A vertical reinforcing bar and a horizontal reinforcing bar are placed on the upper plate. The pair of lateral plates is horizontally bent in the lateral plate, thereby being placed on the top of a half PC beam. The downward space is formed by the upper and lateral plates. The opening is formed in one or more end parts of both end parts of a PC slab and connected to the downward space. The stop plate fitting portion is formed in the end part of the PC slab where the opening is formed. The stop plate is installed in the stop plate fitting portion. The reinforcement plate being installed in the lower pate improves a bending strength thereby extending a span.

Description

Pc slab for one way joist slab and producing method of it}

The present invention relates to a PC slab for forming a beam and slab structure that is prefabricated in the factory in the shape of a half slab and mounted on a PC beam in the field and then integrated by topping concrete, and more specifically, in one direction. The present invention relates to a PC slab for constructing a joist slab, and to a structure of a PC slab that is easy to manufacture and economical and that can achieve perfect coupling with a beam, and a method of manufacturing the slab.

Reinforced concrete structure is not only excellent in durability, fire resistance, earthquake resistance, and wind resistance, but is also widely used in large buildings such as multi-family houses, officetels and underground parking lots due to its low construction cost and easy maintenance. Conventionally, the conventional wet method used for reinforcing concrete structures has been mainly used, but the main structures such as columns, beams, slabs, etc. can be used to prevent poor construction and shorten the construction period. The application of the dry method of pre-fabrication and simple assembly in the field is increasing.

However, since the construction by the pure dry method in the structure to stiffen each structure, such as a ramen structure, there is a fear that poor construction may occur because precision is required for construction at the connection to the joint.

Therefore, in recent years, after transferring the structure of the beam, slab, etc., only a part of the body PC column, PC beam, PC slab or deck plate made in the factory to the site, in the field to assemble the PC members and cast concrete Therefore, a method for ramen-structured bonding between the structures is widely used. In the above method, the PC-slab or deck plate is mounted on the upper surface of the half PC beam that protrudes the reinforcing bar, and then, the concrete of the upper part of the half PC beam and the upper surface of the PC slab or deck plate is poured to complete the beam-slab structure. .

Meanwhile, the PC slab may be a one-way slab or a two-way slab, but in the case of the two-way slab, many beams need to be installed, thereby increasing the amount of construction and load. In addition, when the deck plate is used, the length of the span can be implemented only about 6 to 8m, and thus a problem of reducing space efficiency occurs in a building requiring a long span. Therefore, in buildings requiring long spans of 8m or more, the one-way longline slabs tend to be preferred.

The PC slab used in the one-way joist slab structure is divided into rib type and uneven type. The rib type PC slab is a structure that reinforces the strength of the slab by forming a plurality of ribs on the bottom of the slab, where the PC slab and the PC slab meet. Although there is a problem in that the slab is weakly bonded because the concrete is thin in the part, the uneven PC slab has a thicker thickness of the overlay concrete in the area where the PC slab and the PC slab meet. Well done.

The uneven type one-way joist slab is connected to the upper surface of the half PC beam where the reinforcing bar is protruded by a plurality of upper and lower plates connected by side plates to continuously mount the PC slab for one-way joist slab that forms an uneven shape. It is constructed by pouring concrete over and in a PC slab. However, when the uneven PC slab is mounted on the half PC beam, concrete may leak into the lower space of the upper plate when pouring the concrete, so that the conventional one-way joist slab PC slab is shown in FIG. 1A. It has been used to form and integrally form the end plate (End Closure) that blocks the space of the upper plate lower portion at both ends. Therefore, the mold for manufacturing the PC slab integrally formed with the membrane as described above, as shown in Figure 1b also had a closed structure in which the front, rear formwork plate is formed corresponding to the shape of the membrane plate.

However, since the mold having such a closed structure cannot be freely deformed according to the length of the PC slab, when the length of the PC slab is changed, there is a problem in that productivity and economy are inferior, such as a new mold to be manufactured.

The present invention solves the problems of the one-way joist slab PC slab formed integrally as described above, to reduce the manufacturing cost, increase the productivity, reduce the load of the PC slab to reduce the transportation cost and facilitate construction such as lifting The purpose is to provide a one-way joist slab PC slab and a method for manufacturing the same.

According to a preferred embodiment of the present invention for achieving the above object, in the PC slab is mounted on the half PC beam and concrete poured at the same time with the rest of the half PC beam, so that the beam and the slab is integrally combined, the PC slab Is composed of a top plate on which longitudinal bars and transverse bars are placed, a pair of side plates bent downward at both side ends of the top plate, and a pair of bottom plates bent horizontally outward from the side plates and placed on an upper half PC beam surface. A downward space formed by an upper plate and a side plate is formed, and at least one end portion of both sides of the PC slab is formed with an open portion communicating with the downward space, and a membrane plate fitting portion is formed at an end portion of the PC slab formed with the opening portion. PC slab for one-way joist slab, characterized in that the plate-like membrane plate is installed in the membrane plate fitting portion Is provided.

According to another preferred embodiment of the present invention, there is provided a PC slab for one-way joist slab, characterized in that the diaphragm fitting portion is provided with fitting grooves on the inner surface of the upper plate and the side plate of the PC slab.

According to another preferred embodiment of the present invention, there is provided a PC slab for one-way joist slab, characterized in that the diaphragm fitting portion is provided with a stepped groove recessed inward at the end of the PC slab.

According to another preferred embodiment of the present invention, the lower plate is provided with a PC slab for one-way joist slab, characterized in that the reinforcing member is further installed.

According to another preferred embodiment of the present invention, the step of installing the lower formwork is formed bone, the step of installing a projection band for forming a partition plate fitting portion on the protruding surface of the lower formwork, installing a reinforcing member on the bone Installing an open end formwork at a position corresponding to the length of the PC slab to be manufactured, Installing the side formwork on the bone, Placing concrete to cure, and removing each formwork Provided is a method of manufacturing a PC slab for a one-way joist slab.

According to another preferred embodiment of the present invention, the reinforcing member is provided with a PC slab for one-way joist slab, characterized in that the reinforcement or pre-stressed steel wire introduced.

PC slab for one-way joist slab of the present invention has a structure that does not form a membrane plate integrally, and consists of unit members, so that its own weight is reduced, thereby facilitating transport and lifting and improving workability. .

In addition, since the PC slab for one-way long-line slab of the present invention does not integrally form a membrane plate, it is possible to manufacture PC slabs having various lengths in the same mold, thereby reducing the PC slab manufacturing cost.

In addition, the PC slab for one-way long wire slab of the present invention has the effect that can implement a long span structure of 8m or more by arranging the steel wire introduced prestress.

1 is related to the prior art, Figure 1a is a perspective view of a conventional one-way joist slab PC slab, Figure 1b is a perspective view showing a mold for manufacturing a one-way joist slab PC slab of Figure 1a. .
Figure 2a is a general perspective view of the PC slab of the present invention, Figure 2b is a state diagram in which a plurality of PC slabs of the present invention are formed in succession to form an uneven slab.
3 is an explanatory diagram showing a construction process of a slab structure using the PC slab of the present invention.
Figure 4 is a state diagram mounted on a half PC beam in a state that does not install a blocking plate in the PC slab of the present invention.
Figure 5a is a perspective view of the PC slab of the present invention having a fitting groove on the inner surface of the top plate and the side plate, Figure 5b is a cross-sectional view illustrating the case where the overlay concrete is installed by installing a membrane plate in the fitting groove.
Figure 6a is a perspective view of the PC slab of the present invention having a stepped groove recessed inwardly of the end, Figure 6b is a cross-sectional view illustrating the case where the overcast concrete is installed by installing a barrier plate in the stepped groove.
7A to 7E are respective process perspective views illustrating a process of manufacturing the PC slab of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, when the technical concept of the present invention is obscured or obscured by describing the known configuration in detail, the description of the known configuration will be omitted.

PC slab for one-way joist slab of the present invention (100, hereinafter referred to as "PC slab") is placed on the upper surface of the half PC beam 200 to form a substructure of the slab structure, as shown in Figure 2a, It consists of an upper plate 110, a pair of side plates 130 bent downward at both side ends of the upper plate 110, and a lower plate 120 bent horizontally outward from the side plate 130 to form a module , And a plurality of continuous to form a concave-convex slab as shown in Figure 2b.

The PC slab 100 serves as a formwork for placing the upper structure of the slab structure, the reinforcement concrete forming the upper structure after the longitudinal reinforcing bars and transverse reinforcement (S) on the upper plate 110 (C) is poured to complete the slab structure.

The lower plate 120 of the PC slab 100 placed on the upper surface of the half PC beam 200 is combined with the lower plate 120 of the adjacent PC slab 100 to form downward unevenness, which is formed by the uneven shape. The upward space 140 'is filled with the overlay concrete (C) to form a joist that serves as a small beam.

The upward space 140 ′ formed by the lower plates 120 is a sheath into which a steel wire that can reinforce the connecting reinforcing rod T or pre-stress is introduced in a post-tension manner before placing the overlay concrete C. By arranging the tube or by placing the non-adhesive post-tension coated steel wire, it provides another function of economically realizing the continuous slab while providing a structurally advantageous end connection structure.

The reinforcing member 180 may be further inserted into the lower plate 120. The reinforcing member 180 may be steel or steel wire to which prestress is introduced. The reinforcing member 180 improves the bending strength of the PC slab 100 to achieve the span of the span.

In addition, the PC slab 100 of the present invention is that at least one end of the opening 150 is formed in communication with the downward space 140 formed by the upper plate 110 and the side plate 130 at both ends thereof. Another important feature. The opening portion 150 gives an effect of making it possible to manufacture the PC slab 100 of various lengths using the same mold.

Meanwhile, in order to construct a ramen structure in which pillars, beams, and slab structures are integrated by using the PC slab 100 of the present invention, as illustrated in FIG. 3, the upper part of the PC pillar 300 protrudes upwards. After mounting the half PC beam 200 protruded into the reinforcing bar, the PC slab 100 of the present invention is continuously placed on the upper surface of the half PC beam 200, and then the overlay concrete (C) is placed in a batch. When the PC slab 100 of the present invention is mounted on the upper surface of the half PC beam 200 as described above, as shown in FIG. 4, the opening 150 formed at the end of the PC slab 100 is coated concrete. It may be the leak path of (C).

Accordingly, in the PC slab 100 of the present invention, a membrane plate fitting portion 160 is formed at an end side of the PC slab end portion formed on the half PC beam 200 in which the opening portion 150 is formed, and the membrane plate fitting portion ( It is another important feature of the present invention that the plate-like membrane plate 170 is installed in the 160. That is, when the PC slab 100 is mounted on the half PC beam 200, the membrane plate 170 is installed in advance in the membrane plate fitting portion 160, or the membrane plate 170 after the PC slab 100 is mounted. By installing the closing the opening 150, it is possible to prevent the overcast concrete (C) to leak to the outside. The barrier plate 170 provides a side effect that can be used as a decorative element to beautify the joint between the beam and the slab structure viewed from the interior.

5 and 6 illustrate each embodiment in which the membrane plate fitting 160 is formed on the PC slab 100 of the present invention.

The membrane plate fitting 160 may be provided with fitting grooves 160 ′ on the inner surface of the upper plate 110 and the side plate 130 of the PC slab 100, as shown in FIG. 5A. In this case, the membrane plate 170 must be installed in advance before the PC slab 100 is mounted on the upper surface of the half PC beam 200. FIG. 5B illustrates a cross section of a structure in which the cover plate 170 is installed in the fitting groove 160 ′ to pour the coated concrete C therein.

In another embodiment, the diaphragm fitting 160 may be provided with a stepped groove 160 "recessed inwardly at the end of the PC slab 100, as shown in Figure 6a. The 170 is installed after the PC slab 100 is mounted on the upper surface of the half PC beam 200. The stepped groove 160 " formed at the end facilitates the installation of the barrier plate 170, and the overlay concrete It provides another effect that it is possible to more reliably prevent the membrane plate 170 from being pushed out by the side pressure of the concrete during the pouring of (C). 6B illustrates a cross section of a structure in which the cladding plate 170 is installed in the stepped groove 160 ″ to pour the coated concrete C therein.

As described above, the PC slab 100 of the present invention, which forms an open portion 150 in communication with the downward space 140 formed by the upper plate 110 and the side plate 130 at at least one end, is the same as described above. By using a mold to produce a PC slab 100 of various lengths without applying a special structural change, solving the problem that had to manufacture a new mold according to the length of the conventional PC slab 100 PC slab 100 It is possible to drastically reduce the production cost of the.

7A to 7E illustrate a process of manufacturing the PC slab 100 of the present invention. PC slab 100 of the present invention, a) installing the lower formwork 410, the bone 411 is formed (see Figure 7a), b) forming a membrane plate on the protruding surface of the lower formwork 410 Installing the protruding band 440 (see FIG. 7B), c) Installing the reinforcing member 180 on the valley 411 (see FIG. 7C), d) of the PC slab 100 to be manufactured. Installing an open end formwork 420 at a position corresponding to the length, and installing the side formwork 430 on the valley 411 (see FIG. 7D), e) Placing concrete to cure (see FIG. 7E). And, f) is produced through a process comprising the step of removing each formwork.

The lower formwork 410 is sufficient if the protruding surface corresponds to the bottom shape of the PC slab 100, but it is preferable to have a plurality of concave-convex structures so that a plurality of PC slabs 100 can be manufactured at one time. Do. The PC slab 100 may be manufactured by integrating a plurality of, for example, one having a shape of three consecutive. At least one of the front and rear surfaces of the lower formwork 410 has a shape of an open surface 412. For reference, FIGS. 7A to 7E of the embodiment illustrate a process of manufacturing a PC slab having an opening formed at only one end thereof, and thus the lower formwork 410 of FIGS. 7A to 7E also has an open surface 412. Illustrates that formed on only one side.

The protruding band 440 for forming the membrane plate fitting portion 160 on the inner surface of the downward space 140 of the PC slab 100 is formed so as to be formed only on the inner surfaces of the upper plate 110 and the side plate 130 of the PC slab 100. It is to be installed on the protruding surface of the formwork (ie, the upper surface and the side surface except the bone portion). In addition, the width and depth of the protruding band 440 should correspond to the thickness and insertion depth of the membrane plate 170.

A reinforcing member 180 for reinforcing the bending strength of the PC slab 100 is installed in the valley 411 formed by the uneven shape of the lower formwork 410. The reinforcing member 180 may be steel, but is preferably a steel wire to which prestress is introduced. As the introduction method of the prestress, any one of a known pretension method and a posttension method may be used.

When the installation of the reinforcing member 180 is completed, installed across the open end formwork 420 so as to correspond to the end formed with the opening portion 150 of the PC slab 100, the bone 411 formed in a vertical direction thereto The part is provided with a side formwork 430 for forming the outer surface of the side plate 130 of the PC slab 100. When the installation of each formwork is completed, after pouring concrete and curing it, removing the formwork PC slab 100 of the present invention is completed.

The present invention has been described in detail above with reference to specific embodiments, but the above embodiments are merely examples for easy understanding of the present invention, and therefore, substitutions, additions, and modifications within the scope do not depart from the spirit of the present invention. Embodiments will also belong to the protection scope of the present invention as defined by the claims below.

100: PC slab for one-way joist slab 110: Top plate
120: bottom plate 130: side plate
140: downward space 140 ': upward space
150: opening portion 160: membrane plate fitting portion
160 ': Fitted groove 160 ": Stepped groove
170: membrane plate 180: reinforcing member
200: half PC beam 300: PC pillar
410: lower die 411: goal
412: open side 420: open end formwork
430: side formwork 440: protruding band
S: Longitudinal, transverse bars C: Overlay concrete
T: Reinforcing bar

Claims (9)

In the PC slab 100 is mounted on the half PC beam 200 to concretely cast with the rest of the half PC beam 200 so that the beam and the slab is integrally combined, the PC slab 100 is in the longitudinal direction The upper plate 110 on which reinforcing bars and transverse reinforcing bars S are placed, a pair of side plates 130 bent downward at both side ends of the upper plate 110, and horizontally bent outwardly at the side plate 130 and half Comprising a pair of lower plate 120 which is placed on the upper surface of the PC beam 200, the downward space 140 formed by the upper plate 110 and the side plate 130 is formed, both ends of the PC slab 100 At least one end of the opening portion 150 is formed in communication with the downward space 140, the PC slab end side in which the opening portion 150 is formed, the membrane plate fitting portion 160 is formed, the membrane plate A plate-shaped membrane plate 170 is installed at the fitting portion 160, and a reinforcing member 180 is installed at the lower plate 120. One-way slabs joists PC slabs, characterized in that The one-way joist of claim 1, wherein the diaphragm fitting portion 160 is provided with fitting grooves 160 'on the inner surface of the upper plate 110 and the side plate 130 of the PC slab 100. PC slab for slab 2. The PC slab for one-way joist slab according to claim 1, wherein the diaphragm fitting portion 160 has a stepped groove 160 " recessed inwardly at an end of the PC slab 100. delete The PC slab according to any one of claims 1 to 3, wherein the reinforcing member 180 is a reinforcing bar. The PC slab according to any one of claims 1 to 3, wherein the reinforcing member 180 is a steel wire to which prestress is introduced. In the method of manufacturing the PC slab 100,
a) installing the lower formwork 410 in which the valley 411 is formed,
b) installing a projection band 440 for forming a membrane plate fitting on the protruding surface of the lower formwork 410,
c) installing the reinforcing member 180 in the valley 411,
d) installing an open end formwork 420 at a position corresponding to the length of the PC slab 100 to be manufactured, and installing the side formwork 430 on the bone;
e) pouring concrete to cure;
f) PC slab manufacturing method for one-way joist slab comprising the step of removing each formwork 8. The method of claim 7, wherein the reinforcing member 180 is a reinforcing bar. 8. The method of claim 7, wherein the reinforcing member 180 is a steel wire in which prestress is introduced.

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