KR101304335B1 - Precast concrete slab having variable horizontal shear connecting member, and method for the same - Google Patents

Abstract

PURPOSE: A precast concrete composite slab with a bend forming member and a construction method for the same are provided to prevent relative sliding motions on the concrete interface of a precast concrete composite slab due to a horizontal shearing force. CONSTITUTION: A precast concrete composite slab with a bend forming member comprises a bend forming member (110), hook fixing members (120a,120b), a variable horizontal shear connector (130), and a flat part (140). The bend forming member is arranged on the top of the flat part in the width or longitudinal direction. The top of the bending member is open in order to form a groove on the surface of the flat part. A hook fixing member is joined to the bottom of the bend forming member in order to be extended into the rib of the flat member. The variable horizontal shear connector is inserted into the groove of the bend forming member. The flat part is embedded by pouring concrete with the bend forming member, the hook fixing member, and the variable horizontal shear connector to be connected to each other.

Description

Precast concrete composite slab with bending molding member and construction method thereof {PRECAST CONCRETE SLAB HAVING VARIABLE HORIZONTAL SHEAR CONNECTING MEMBER, AND METHOD FOR THE SAME}

The present invention relates to a precast concrete composite slab, and more particularly, to a precast concrete composite slab and a slab concrete that can effectively enhance the composite performance of the slab concrete slab of precast concrete (PC) composite slab It is about a construction method.

In general, when the building is formed of a repetitive planar module, the hollow core slab, the double t slab, the multi ribbed slab, and the reverse direction are considered in consideration of economics and constructability. PC slab (Precast Concrete Slab) systems such as Inverted Multi Ribbed Slab are frequently applied.

For example, PC slabs are standardized precast concrete slabs that are manufactured in large quantities at the factory using metal forms, which are either integrally plated or ribbed, or between the top plate and the baseplate. Because of its hollow structure with two ribs, it is used as a ceiling member of a wide prefabricated structure because it is light and rigid.

On the other hand, parking lots of buildings such as large stores and factories are mostly constructed with reinforced concrete structures that are formed of formwork, reinforcement, and concrete. Such reinforced concrete structures have cracks due to the characteristics of the material and leak defects added thereto. Is emerging.

In order to solve this problem, a double T slab method is recently used, which will be described below with reference to FIGS. 1A and 1B.

1A and 1B are respectively a perspective view and a front view of a double T slab according to the related art.

1A and 1B, the double tee slab construction structure 10 according to the related art is provided with pillars 11 spaced apart from the bottom plate at regular intervals, and on the jaw 11a of the pillar 11. In the state in which the beam 12 is seated and the double tee slab 13 is seated on the beam 12, as shown in FIG. 1B, the slab concrete is formed on the beam 12 and the double tee slab 13. 14) is poured to form a slab layer.

In the double tee slab construction structure 10, the slab layer is formed by the slab concrete 14 is cast in a state seated on the jaw of the beam 12 or the pillar 11, and the pillar 11 and The beam 12 is not integrally formed, and the double tee slab 13 is designed as a simple beam.

On the other hand, Figure 2 is a perspective view of the configuration of a PC slab formed with a lattice rebar according to the prior art.

Referring to Figure 2, the PC slab 50 is formed with a lattice reinforcement according to the prior art is formed so that the upper portion of the lattice reinforcement 55 is exposed on the upper surface 56, ensuring the integrity of the lattice reinforcement slab concrete It may be for, and the upper surface is formed with a plurality of lifting irons (51, 52).

PC slab 50 formed with such a lattice reinforcement is a pair of lower reinforcement (53, truss reinforcement) extending in the longitudinal direction and installed spaced apart from each other, is disposed in the longitudinal direction spaced apart from the lower reinforcement 53 The lattice bar 54, the connection wire 55 continuously extending in a wave form between the lattice bar 54 and the lower reinforcement 53 may be included. At this time, the upper portion of the connecting wire 55 and the lattice bar 54 is exposed upward from the upper surface can ensure the integrity with the slab concrete.

However, since the top plate of the double tee slab is very thin, there is a problem that it is practically impossible to bury the lattice reinforcing bar of the PC slab 50.

In addition, in the case of the connecting wire 55, it is formed at an angle that is unfavorable to the shear crack of the PC slab 50, there is a problem that not only the amount of material required for the connecting wire 55 increases, but also effective shear cracking control is difficult.

On the other hand, Figures 3a and 3b is a photograph showing a lattice type shear reinforcement and a 90-degree hook-like shear reinforcement are arranged continuously over the entire span of the PC slab according to the prior art, respectively.

Excessive shear connectors are used for the integral behavior between PC slabs and cast-in-place concrete according to the prior art. For example, when fabricating a PC slab according to the prior art, the same reinforcement is applied regardless of structural conditions, and the lattice type shear rebar 60 shown in FIG. 3A or the entirety of the PC slab span is shown in FIG. Since the 90-degree hook-type shear reinforcing bar 70 is disposed continuously, there is a problem that the cost ratio increases. In addition, due to the reinforcing bar protruding to the surface there is a problem in that it is disadvantageous to the loading carriage.

1) Republic of Korea Patent No. 10-629795 (application date: September 7, 2004), the title of the invention: "Combined structure of precast concrete beam and bottom plate for slim floor method" 2) Republic of Korea Patent No. 10-1175525 (Application Date: March 6, 2012), the title of the invention: "Method and construction method and structure of the PC slab" 3) Republic of Korea Patent No. 10-1079267 (Application Date: April 22, 2009), the title of the invention: "tee type PC slab and its construction method" 4) Republic of Korea Patent No. 10-1036748 (application date: December 31, 2009), the title of the invention: "Multi-ribbed PC slab" 5) Republic of Korea Patent Publication No. 2009-50520 (published: May 20, 2009), the title of the invention: "Ribbed half-PC bottom plate and its manufacturing method"

Technical problem to be solved by the present invention for solving the above-described problems, by using a bending molding member that can be easily disposed can prevent the sliding behavior relatively by the horizontal shear force at the concrete interface of the precast concrete composite slab, It is to provide a precast concrete composite slab having a bending molding member and its construction method.

Another technical problem to be achieved by the present invention is to precast concrete composite slab having a bending molding member, which can directly adjust the amount of horizontal shear connecting material required according to the span and load (using a variable horizontal slip prevention hardware) and It is to provide the construction method.

Another technical problem to be achieved by the present invention is to precast concrete composite slab having a bending molding member, which can reduce the manufacturing cost of the PC slab by placing the bending molding member and the variable horizontal slip-resistant hardware as a horizontal shear connecting member and It is to provide the construction method.

As a means for achieving the above technical problem,

In a precast concrete slab (PC slab) comprising a flat plate, the PC slab is

A bending molding member that is bent and formed to form a groove in a surface of the flat plate portion and is buried in a width or length direction on the flat plate portion; It provides a precast concrete composite slab having a bending molding member and a construction method including a;

Also preferably,

Precast concrete composite slab having a bent molding member which is inserted along the groove formed by the bent molding member and is further provided with a variable horizontal shear connector to prevent the sliding behavior relatively by horizontal shear force at the concrete interface and its construction method To provide.

Also preferably,

The variable horizontal shear connecting member is a horizontal slip preventing steel having a support, and is provided at a predetermined interval from the side of the bending molding member is provided with a precast concrete composite slab having a bending molding member to adjust the horizontal shear strength and its construction method do.

Also preferably,

The horizontal slip preventing steel is a reinforcing bar or stud bolt having a support, and provides a precast concrete composite slab having a bending molding member which is arbitrarily adjusted in the number of inserts into the groove of the bending molding member, and a construction method thereof.

Also preferably,

" 형상 또는 "

" 형상으로 성형되는 합성슬래브 및 그 시공방법을 제공한다.The bending molding member may be inserted into the base of the steel for preventing the horizontal slip

"Shape or"

It provides a synthetic slab molded in the shape and a construction method thereof.

Also preferably,

A hook fixing member is further installed at the lower portion of the bending molding member, and the hook fixing member is a precast concrete composite slab having a bending molding member which is made of a hook-shaped reinforcing bar at the lower portion of the bending molding member and its construction. Provide a method.

According to the present invention, by using a bending member and a variable horizontal slip preventing hardware as a horizontal shear connector, it is possible to prevent the sliding behavior relatively by the horizontal shear force at the concrete interface of the precast concrete composite slab.

According to the present invention, it is possible to directly adjust the amount of the horizontal shear connector required in accordance with the span and load in the field can improve the cost increase due to the conventional horizontal shear connector was placed uniformly.

According to the present invention, it is possible to reduce the manufacturing cost of the PC slab by arranging the variable horizontal slip prevention hardware as a horizontal shear connecting material.

1A and 1B are respectively a perspective view and a front view of a double T slab according to the related art.
Figure 2 is a perspective view of the configuration of a PC slab formed with a lattice rebar according to the prior art.
3A and 3B are photographs showing a lattice type shear reinforcement and a 90 degree hooked reinforcement, respectively, which are continuously disposed over the entire span of a PC slab according to the related art.
4 is a perspective view of a precast concrete composite slab having a bend forming member according to an embodiment of the present invention.
5A and 5B are diagrams each showing an example of a variable horizontal shear connector in a precast concrete composite slab according to an embodiment of the present invention.
6A and 6B are views illustrating another example of the variable horizontal shear connecting member in the precast concrete composite slab according to the embodiment of the present invention.
7 is a construction front view of a precast concrete composite slab having a bending molding member according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

[Precast concrete composite slab having a bending molding member according to an embodiment of the present invention (PC slab: 100)]

Figure 4 is a perspective view of a precast concrete composite slab having a bending molding member according to an embodiment of the present invention, Figures 5a and 5b are each of the variable horizontal shear connector in the precast concrete composite slab according to an embodiment of the present invention 6A and 6B are diagrams each showing another example of the variable horizontal shear connecting member in the precast concrete composite slab according to the embodiment of the present invention.

Referring to FIG. 4, the precast concrete slab (PC slab) 100 having the bending molding member according to the embodiment of the present invention is a bending molding member 110, a hook fixing member 120a, 120b), the variable horizontal shear connector 130 and the flat portion 140.

The bent molding member 110 is disposed in the width or length direction on the upper portion of the plate portion 140, and is formed so that the upper portion is opened on the surface of the plate portion so that a groove having a predetermined shape is formed in the plate portion 140.

That is, the bending molding member 110 is to form a concave groove naturally on the surface of the flat plate portion 140, and the slab concrete is poured into the groove is filled to enhance the composite performance of the flat plate and the slab concrete.

" 형상 또는 도 6a 및 도 6b에 도시된 바와 같이, "

" 형상으로 성형될 수 있다.In order to form a groove in the plate portion 140, for example, the bending molding member 110 is formed by a steel sheet bending molding member that is formed by bending the steel sheet, wherein the steel sheet bending molding member of the variable horizontal shear connector 130 described later As shown in FIGS. 5A and 5B so that the base can be inserted,

"Shape or as shown in Figures 6A and 6B,"

Can be molded into shapes.

The hook fixing members 120a and 120b may have a lower portion of the bending molding member 110 so as to extend into a rib portion of the flat plate 140, for example, a rib of a double tee PC slab to reinforce the vertical shear strength. Bottom).

In this case, the hook fixing members 120a and 120b may be made of a hook-shaped reinforcing bar to be coupled to the lower portion of the bent molding member 110 by 90 degrees.

The variable horizontal shear connecting member 130 is inserted along the grooves formed in the bending members 110a and 110b, respectively, as shown in FIGS. 5B and 6B, and relatively slides due to the horizontal shear force at the concrete interface. To prevent.

The variable horizontal shear connecting member 130 is a horizontal slip preventing iron (131 ~ 137) having a base, is inserted at predetermined intervals in the side of the bending forming members (110a, 110b) to adjust the horizontal shear strength. That is, the horizontal slip preventing hardware (131 ~ 137) is a reinforcing bar or stud bolt having a base, the number of the inserted into the groove of the bending forming members (110a, 110b) can be arbitrarily adjusted.

That is, the variable horizontal shear connector 130 is a variable horizontal shear connector 130, such as reinforcing bars or stud bolts having a bearing, when the shear strength of the horizontal shear due to the irregularities formed on the surface by the steel sheet bending molding member 110 is insufficient. Inserted from the side, the horizontal shear strength can be adjusted arbitrarily.

The flat plate 140 is a concrete pouring body, and is formed to be embedded by pouring concrete in a state in which the bending molding member 110, the hook fixing members (120a, 120b) and the variable horizontal shear connector 130 is combined. do.

Specifically, the flat plate 140 serves as a formwork for slab concrete pouring as a concrete pouring body, it is synthesized integrally with the slab concrete that is subsequently poured to form a composite floor plate.

Since the flat plate 140 is made of a thin plate, reinforcing bars or wire mesh can be reinforced for flexural reinforcement, and also by arranging a tension member composed of PS steel bars or PS strands to form a long span to suppress cracking. Prestress may be introduced.

PC slab 100 according to an embodiment of the present invention, by using a bending molding member and a variable horizontal slip-resistant hardware as a horizontal shear connector, the sliding behavior relatively by the horizontal shear force at the concrete interface of the precast concrete composite slab Can be prevented more effectively.

PC slab 100 having a bending molding member according to an embodiment of the present invention, the amount of variable horizontal shear connecting member 130 required according to the span and load can be directly adjusted in the field, the existing horizontal shear uniformly arranged The cost increase due to connecting materials can be improved.

PC slab 100 having a bending molding member according to an embodiment of the present invention, it is possible to reduce the manufacturing cost of the PC slab 100 by arranging the variable horizontal slip-resistant hardware to the horizontal shear connector (110).

[Construction method of PC slab 100 having a bending molding member according to an embodiment of the present invention]

7 is a construction front view of a precast concrete composite slab having a bending molding member according to an embodiment of the present invention.

Referring to FIG. 7, in the construction method of a PC slab having a bending molding member according to an embodiment of the present invention, first, a pillar 200 is constructed, and beams 300 are formed by using the steps of the pillar 200. Will install

Thereafter, the beam 300 is arranged to support the bottom surface of the PC slab 100 provided with the bending molding member 110 according to an embodiment of the present invention. In addition, the structural reintegration of the PC slab 100 and the beam 300 having the bending molding member according to the embodiment of the present invention by penetrating the connecting reinforcement 160 to the ring reinforcement 150 of the PC slab 100 Can be secured.

Specifically, the PC slab 100 having the bending molding member includes a bending molding member 110, a hook fixing member (120a, 120b), a variable horizontal shear connector 130 and a flat plate 140.

As described above, the variable horizontal shear connecting member 130 of the PC slab is a horizontal slip preventing steel having a base, is inserted at predetermined intervals from the side of the bending forming member 110 to adjust the horizontal shear strength, the horizontal The anti-slip iron is a reinforcing bar or stud bolt having a base, and the number inserted into the groove of the bending molding member 110 may be arbitrarily adjusted.

" 형상 또는 "

" 형상으로 성형될 수 있다. 또한, 상기 PC 슬래브의 갈고리 정착부재(120a, 120b)는 상기 강판 절곡성형부재(110)의 하부에 90도로 결합되도록 갈고리 형상의 철근으로 제작될 수 있다.In addition, the bending molding member 110 of the PC slab may be inserted into the base of the steel for preventing the horizontal slip

"Shape or"

It can be molded in the shape. In addition, the hook fixing members (120a, 120b) of the PC slab may be made of a reinforcing bar-shaped reinforcement to be coupled to the lower portion of the steel sheet bending forming member 110 by 90 degrees.

Next, the slab concrete 400 is poured on top of the PC slab 100 and the beam 300 having the bending molding member according to the embodiment of the present invention to form a slab layer. At this time, the pillar 200 and the beam 300, the slab concrete 400 is also poured together to the connection portion of the PC slab 100 according to an embodiment of the present invention to finish.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100: PC slab with bending molding member
110, 110a, 110b: bending molding member
120a, 120b: hook fixing member
130: variable horizontal shear connector
140: plate part
150: ring rebar
160: connecting rebar
200: Column
300: Bo
400: slab concrete

Claims (13)

In the precast concrete slab (PC slab) including a flat plate 140, the PC slab is
A bent molding member 110 that is bent and formed to have a groove formed on the surface of the flat plate part 140 and is buried in the width or length direction of the flat plate part; And
Precast concrete composite slab with a bent forming member, characterized in that it comprises a ;; The method of claim 1,
Inserted along the groove formed by the bending forming member 110 is provided with a flexible horizontal shear connecting member 130 is further installed to prevent the sliding behavior relatively by the horizontal shear force at the concrete interface is provided with a bending molding member One precast concrete composite slab. The method of claim 2,
The variable horizontal shear connecting member 130 is a horizontal slip preventing iron having a base, and is precast concrete composite having a bending molding member characterized in that it is inserted at predetermined intervals from the side of the bending molding member to adjust the horizontal shear strength Slab. The method of claim 3,
The horizontal slip preventing steel is a pre-cast concrete composite slab having a bending molding member, characterized in that the reinforcement or stud bolt having a support, the number of insertion into the groove of the bending molding member is arbitrarily adjusted. 5. The method of claim 4,
The bending forming member 110 may be inserted into the base of the steel for preventing the horizontal slip

"Shape or"

Precast concrete composite slab having a bending molding member, characterized in that molded in the shape. The method of claim 1,
Hook fixing members 120a and 120b are further installed at the bottom of the bending molding member 110, and the hook fixing member is provided with a bending molding member, characterized in that the hook-shaped reinforcing bar is formed at the bottom of the bending molding member. One precast concrete composite slab. In the construction method of precast concrete slab (PC slab),
a) constructing a column;
b) installing a beam using the steps of the pillar;
c) arranging the bottom of the precast concrete composite slab having the bending molding member on the beam to be supported; And
d) forming a slab layer by pouring slab concrete on top of the precast concrete composite slab and the beam having the bending molding member;
Including, but the precast concrete composite slab having the bending molding member,
A bent molding member 110 that is bent and formed to form a groove in a surface of the flat plate portion and is buried in a width or length direction on the flat plate portion; And a flat plate portion (140) formed by pouring concrete so that the upper portion of the bent molding member is embedded. 8. The method of claim 7,
Inserted along the groove formed by the bending forming member 110 is provided with a flexible horizontal shear connecting member 130 is further installed to prevent the sliding behavior relatively by the horizontal shear force at the concrete interface is provided with a bending molding member Construction method of a precast concrete composite slab. The method of claim 8,
The variable horizontal shear connecting member 130 is a horizontal slip preventing iron having a base, and is precast concrete composite having a bending molding member characterized in that it is inserted at predetermined intervals from the side of the bending molding member to adjust the horizontal shear strength Construction method of slab. 10. The method of claim 9,
The horizontal slip preventing steel is a reinforcing bar or stud bolt having a support, the construction method of the precast concrete composite slab having a bending molding member, characterized in that the number of inserts into the groove of the bending molding member is arbitrarily adjusted. 10. The method of claim 9,
The bending forming member 110 may be inserted into the base of the steel for preventing the horizontal slip

"Shape or"

"Construction method of precast concrete composite slab having a bending molding member, characterized in that molded in the shape. The method of claim 7, wherein
Hook fixing members 120a and 120b are further installed at the bottom of the bending molding member 110, and the hook fixing member is provided with a bending molding member, characterized in that the hook-shaped reinforcing bar is formed at the bottom of the bending molding member. Construction method of a precast concrete composite slab. The method of claim 7, wherein
The method of constructing precast concrete composite slab with a bending molding member, characterized in that in the step c) to ensure the structural integrity of the PC slab and the beam by penetrating the connecting bar to the ring reinforcement of the PC slab.

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