KR20140013830A - Π-shaped precast concrete slab and construction method using the same - Google Patents

Abstract

The present invention relates to a pi-type PC slab and a composite method using the same, wherein the PC slab integrally comprises: an upper plate having buried connection bars formed at the upper side thereof at regular distances; webs downwardly formed at both end portions of the upper plate; and lower plates formed to outwardly protrude from the bottom portions of the webs, wherein the lower plate has: a upper flange protruding from the upper side of the outer end portion thereof; and a lower flange protruding from the upper side of the outer end portion thereof and more protrusive than the upper flange. According to the present invention, the pi-type PC slab is shaped into a pi of which the lower side is opened so that a structure applied with the PC slab can be lightened; the structure can be easily constructed because topping concrete is placed on the PC slab which is simply mounted; tendons can be easily arranged because the tendons are arranged in a space between the PC slabs; the upper plates and the lower plates simultaneously function as shear keys when the PC slabs are mutually coupled in the width directions thereof so that a composite action between the PC slabs and precast concrete at the upper sides thereof can be strengthened and cracks between the PC slabs can be prevented, wherein the cracks are due to loads applied on the upper sides of the PC slabs.

Description

Π-shaped Precast Concrete Slab and Construction Method Using the Same}

The present invention relates to a pi (π) type PC slab and a compounding method using the same, and more particularly, the upper plate, the abdominal plate formed in the lower portion of the upper plate, and the lower plate protruding outward from the abdomen plate, the lower portion is an opening It can be composed of the pi (π) shape to reduce the self-weight of the structure, and it is very easy to construct because it is completed by simply mounting the PC slab and placing the topping concrete, and by placing the tension material in the space between the PC slab It is easy to arrange, and the upper plate and the lower plate play the role of shear key at the time of joining the PC slab in the width direction, so it strengthens the synthesizing effect with the upper field concrete and prevents cracks between the slabs due to the upper load. It relates to a π) type PC slab and a compounding method using the same.

In the Precast Concrete Method, the Double Tee Slab method is mainly used to construct large-space buildings requiring long spans such as large stores or logistics warehouses, and medium and short spans like underground parking lots. Precast Reinforced Concrete Layer Construction Method using Hollow core Slab and Half Slab is used as a PC method for building.

The PRC compounding method is a method of converting a reinforced concrete beam-pillar structure into a PC. The PC joints, PC beams, and half slabs manufactured at the factory are transported, lifted and assembled to the site, and then joined. It is a method of integrating the structure by pouring topping concrete on the top of the slab and the half slab.

On the other hand, longer spans are required due to the need for securing sufficient parking space (4-6 parking spaces in the existing three right-sided parking lots) in the construction of recent underground parking lots. Since the construction of the directional slab is not suitable, the construction is performed in two directions.

That is, in the half slab method, if a certain span (more than 4m) or more in the structural dynamics, due to safety problems need to install additional support, there was a problem to avoid construction due to the additional cost increase. On the other hand, if the additional support is removed, the half slab thickness and the amount of rebar are increased, resulting in an increase in construction cost.

On the other hand, the hollow core slab (HCS) method uses the PS steel wire that introduces the prestressing force to the lack of tensile resistance, which is a weakness of concrete, to apply the pre-stressing force to the concrete. It is a prestressed concrete structure that has improved performance. It is mainly applied to the structure by using hollow slab that reduces the weight of the structure by forming a hollow in the concrete cross section.

However, HCS method requires additional expensive equipment to secure minimum thickness due to PS steel wire tension and production of HCS member, resulting in unit price increase, and it is difficult to repair when crack occurs in member, and it is more economical than double tee in long span over 10m. There is a problem falling.

In recent years, the Double Tee Slab method, also known as DTS method, has a deep reinforcing rib at the bottom of the double tee slab, and a steel wire is disposed at the bottom of the reinforcing rib to apply an integral member. Configured to achieve. The double tee slab is formed to cause a camber in the center of the double tee slab span due to the tension of the steel wire is mainly applied to the long span structure of about 10m or more.

As a background technology of the present invention, Patent Registration No. 1412183 "A structure for strengthening the integrity of a beam-slab joint in a double slab system and its construction method" (Patent Document 1). In the background art, as shown in FIG. 6, in the double-slab system, in the joint of the beam (PC beam) -slab, both ends are respectively seated on the upper surface of each of the pillars 150, and the quadrangles are reinforced on the upper surface. PC beam 110 having a cross-section of the shape; and a pair of reinforcing ribs 123 each having a recessed mounting surface 122 formed on the front and rear surfaces thereof so as to be seated on the upper surface of the PC beam 110 is a bottom surface. A double tee slab 120 protruded downward and provided between the double tee slab 120 between the reinforcing rib 123 of the double tee slab 120 and between the reinforcing rib 123. And the cover means 130 are respectively provided to prevent leakage of the site pour topping concrete 140, which can be poured into the upper portion of the PC beam 110 integrally; beams in a double tee slab system comprising a Strengthen the integrity of the slab joint The proposed structure. "

However, since the background art is difficult to form a continuous slab form (high information at both ends) by being settled as a simple beam form when it is placed on a PC beam, it has a lower rib depth in order to reduce the bending resistance and to cope with the accompanying transient deflection. The double tee slab has a problem that the support ribs formed at the bottom of the panel are formed in the form of a simple block of rectangular parallelepiped, and thus the structural stiffness, productivity, assembly and aesthetics of the double tee slab are continuously required. It's coming.

Patent Registration No. 114183 "Structure for strengthening the integrity of beam-slab joints in double slab system and its construction method"

The present invention is to solve the above problems, it can be configured to form a pi (π) type of the lower opening to reduce the weight of the structure, the construction is very simple because it is completed by simply mounting the PC slab and pouring tofill concrete It is easy to arrange the tension material by placing the tension material in the space between the PC slab, and the lower plate acts as the shear key at the same time when the PC slab is joined in the width direction, so that the crack between the slabs due to the upper load can be prevented. It is an object of the present invention to provide a pi (π) type PC slab and a composite method using the same.

The present invention comprises a top plate consisting of a buried connecting muscle is configured at the top at regular intervals; An abdominal plate formed downward at both side ends of the upper plate; A lower plate protruding outward from the lower end of the abdominal plate; is formed integrally, and the lower plate protrudes in the upper and lower portions of the outer end, respectively, and an upper flange and a lower flange are formed, and the lower flange protrudes more than the upper flange. It is to provide a pi (π) type PC slab characterized in that it is formed.

In addition, a pi (π) type PC slab characterized in that the coupling groove is formed in the inner surface drawn in a predetermined length at both ends of the pi (π) type PC slab, the end plate is fitted into the coupling groove. To provide.

In addition, both ends of the upper plate is to provide a pi (π) type PC slab, characterized in that formed more protruding than the end of the abdominal plate.

In addition, the step of producing a pi (π) type PC slab; A pillar is installed, and a fixing portion having a shape protruding upward from one side of the upper surface is formed on the upper portion of the pillar, and end beams and central beams are formed on the fixing portions at regular intervals, and end beams are installed between the side diameters. Installing a central beam in the middle of the trunk; Continuously installing the pi (π) type PC slab on top of the beam; Placing a tension member between the pi (π) type PC slab and an adjacent pi (π) type PC slab, placing the reinforcing bar on top of the pi (π) type PC slab, and then pouring concrete; It is to provide a compounding method using a pi (π) type PC slab, characterized in that it comprises a; step of fixing the tension material after the pour concrete is cured to form the topping concrete.

Pi (π) type PC slab of the present invention and the compounding method using the same can reduce the weight of the structure by constructing a pi (π) type of the lower opening, because it is completed by simply mounting the PC slab and pouring topping concrete It is very easy to construct, and it is easy to arrange the tension material by placing the tension material in the space between the PC slabs, and when combining the PC slab in the width direction, the upper plate and the lower plate play the role of shear key at the same time. It enhances the action and has a very useful effect of preventing cracks between slabs in the upper load.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
1 is a perspective view of a pi (π) type PC slab according to the present invention.
2 is a cross-sectional view of a pi (π) type PC slab according to the present invention.
Figure 3 is a cross-sectional view of the bonded state of the pi (π) type PC slab according to the present invention.
Figure 4 is a flow chart schematically showing a complex method using a pi (π) type PC slab of the present invention.
Fig. 5 is a side cross-sectional view showing a state in which a pi (π) type PC slab of the present invention is installed.
Figure 6 is an exploded perspective view showing the double tee slab and the cover means of the structure to strengthen the integrity of the beam-slab joint in the double tee slab system according to the conventional invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

 Hereinafter, the technical structure of the present invention will be described in detail with reference to the preferred embodiments.

1 is a perspective view of a pi (π) type PC slab according to the present invention, Figure 2 is a cross-sectional view of a pi (π) type PC slab according to the present invention.

The PC slab 1 according to the present invention includes an upper plate 100, an abdominal plate 200 extending downward from both side cross-sections of the upper plate 100, and a lower plate extending outwardly from the abdominal plate 200. 300 is integrally formed, and has a cross section similar to that of the channel and has a pi ([pi]) shape as a whole.

The upper plate 100 is a portion where the topping concrete 5 is poured later, and a plurality of buried connection roots 110 are planted for bending and coupling with the topping concrete 5, and then the upper plate 100 is bent. To cast. In the illustrated embodiment, the shape of the buried connecting muscle 110 is bent end, the buried connecting muscle 110 may be configured in a variety of known forms, of course.

Both end portions of the upper plate 100 are formed to protrude more than the end of the abdominal plate 200 so that the upper plate 100, which generates tensile stress due to the load during construction, can be more stably behaved.

It also places the tension member 4 in the space consisting of the abdominal plate 200, 200 and the lower plate 300, 300 in the widthwise arrangement of the pi (π) type PC slab 1, and the concrete is poured, The space facing each other in the direction adjacent to the upper plate 100, 100 is configured to be narrower than the space consisting of the abdominal plate 200, 200 and the lower plate 300, 300 to serve to enhance the composite effect with the topping concrete And, by configuring the upper plate 100 as wide as possible to reduce the amount of concrete to be poured in the field while also ensuring structural stability.

Abdominal plate 200 is configured to protrude downward from both side ends in the width direction of the upper plate 100, the abdominal plate 200 may form a right angle with the upper plate 100, it is composed of diagonal lines with different angles May be

The lower plate 300 protrudes outward from the lower end of the abdominal plate 200. That is, the lower plate 300 is formed to protrude outward from the outer end of the abdominal plate 200, the lower plate 300 is in contact with each other when the pie (π) -type PC slab 1 is later placed in the width direction To be combined.

The upper plate 100, the abdominal plate 200 and the lower plate 300 is integrally formed.

Figure 3 is a cross-sectional view of the bonded state of the pi (π) type PC slab according to the invention, Figure 3a is a state in which concrete is not poured, 3b shows a state in which concrete is poured.

As shown in FIG. 3A, the lower plate 300 includes an upper flange 310 and a lower flange 320 protruding from the upper and lower portions at the outer ends, respectively, and the upper flange 310 and the lower flange 320. Between the key groove 330 is formed.

At this time, the lower flange 320 is more protruded than the upper flange 310, which is configured to be coupled to the lower plate 300 abuts each other when the pi (π) type PC slab 1 is disposed in the width direction In this case, the lower flanges 320 and 320 of the adjacent pi (π) type PC slab 1 and the pi (π) type PC slab 1 are in contact with each other and the upper flanges 310 and 310 are in contact with each other. An opening is formed without contact between the openings, and a lower shear groove 340 is formed at a lower portion of the opening than the opening where the key grooves 330 and 330 meet.

When the configuration as described above, as shown in Figure 3b, the concrete placed in the shear groove 340 at the time of the topping concrete in the future, because the shear groove 340 is wide and the openings facing the upper flange 310 between the narrow of the shear key It is to play a role.

In addition, the coupling groove 400 is formed on the inner surface of the pi (π) type PC slab 1 of the present invention introduced by a predetermined length from both ends, the end plate 500 is fitted into the coupling groove 400 Can be configured.

The end plate 500 is mounted on the top of the beam (3a) (3b) of the pi (π) type PC slab 1 of the present invention and the lower plate consisting of the upper plate 100 and the lower plate 200 at the time of concrete pouring It is configured to prevent the flow of concrete into the space.

At this time, in order to easily combine the coupling of the end plate 500 in the correct position, to form a coupling groove 400 in the interior of the pi (π) type PC slab (1).

Coupling groove 400 is configured by forming a groove in the interior of the spaced apart a predetermined distance from the end of the pi (π) type PC slab (1). That is, the grooves may be formed on the inner surface of the lower surface of the upper plate 100 and the inner surface of the abdominal plate 200.

Forming the coupling groove 400 as described above, the end plate 500 is coupled to the coupling groove 400 by inserting from the lower portion of the pi (π) type PC slab 1 to the top.

The end plate 500 may be made of various known materials.

Referring to the composite method using a pi (π) type PC slab of the present invention in detail with the drawings as follows.

Figure 4 is a flow chart schematically showing a composite method using a pi (π) type PC slab of the present invention, Figure 5 is a side cross-sectional view showing a state in which the pi (π) type PC slab of the present invention is installed.

First, a pi (π) type PC slab 1 is produced.

Then, as shown in Figure 4a, to install a pillar (2) to be installed pi (π) type PC slab (1), the end beam (3a) and the central beam (3b) on top of the pillar (2) Install.

The end beam 3a is installed on the upper side of the pillar between the side spans, and the center beam 3b is installed in the middle part of the trunk.

The end beams 3a and the central beams 3b have different cross-sectional shapes, and the central beams 3b have a general beam shape, and the end beams 3a have a fixing portion protruding upward from one side of the upper surface. 31). That is, the overall shape of the end beam (3a) is a cross-sectional height is higher than the central beam (3b) and the upper one side block-out shape has a 'b' shape.

The fixing unit 31 is formed by passing through the fixing unit 32 at regular intervals for fixing the tension member 4 later.

Then, as shown in Figure 4b, the pi (π) type PC slab 1 is continuously installed on the upper portion of the beam (3a) (3b).

An end of the pie (π) -type PC slab 1 is seated on an upper surface on which the fixing section 31 of the end beam 3a is not formed, and an inner surface of the fixing section 31 of the end beam 3a is formed. The end of the (π) type PC slab 1 comes into contact.

4C, the tension member (10) is formed in the longitudinal direction of the pi (π) type PC slab 1 between the pi (π) type PC slab 1 and the adjacent pi (π) type PC slab 1. 4) Place.

In the widthwise arrangement of the pi (π) type PC slab 1, the tension member 4 is disposed in a space consisting of the abdominal plates 200, 200 and the lower plate 300, 300, and both ends of the tension member 4 are Temporary fixation is carried out in the fixing tool 32 formed in the fixing | fixed part 31 of the support | pillar 3a, a reinforcing bar is reinforced, and concrete is poured in the upper part of the pi (pi) type PC slab (1).

Then, as shown in Figure 4d, the poured concrete is cured to form the topping concrete (5) to tension the tension material (4) to complete. At this time, the tension member 4 may be attached or non-attached type.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

1: pi (π) type PC slab
2: pillar
3a: end beam
3b: Central beam
4: tension material
5: topping concrete
31: fusing unit
32: anchorage
100: top plate
200 abdominal plate
300:
310: upper flange
320: lower flange
400: coupling groove
500: end plate

Claims (4)

An upper plate (100) configured with a buried connecting muscle (110) configured at an upper portion at regular intervals;
An abdominal plate 200 formed downward at both side ends of the upper plate;
A lower plate 300 protruding outward from the lower end of the abdominal plate 200; is integrally formed, and the lower plate 300 protrudes to the upper and lower portions of the outer end portion, respectively, the upper flange 310 and the lower flange. Pi is formed, the pi (π) type PC slab, characterized in that the lower flange 300 is formed to protrude more than the upper flange (200). The method of claim 1,
Pi (π) type coupling grooves 400 are formed in the inner surface drawn in a predetermined length at both ends of the slab, the end plate 500 is fitted into the coupling groove 400 is characterized in that the coupling configuration (π) type PC slab. The method of claim 1,
Both side ends of the upper plate 100 protrude more than the end of the abdominal plate 200 is pi (π) type PC slab, characterized in that formed. Manufacturing a pi (π) type PC slab (1) according to any one of claims 1 to 3;
The pillar 2 is installed, and the fixing unit 31 protruding upward from one side of the upper surface is formed on the upper portion of the pillar 2, and the fixing unit 31 is formed at regular intervals. Installing an end beam (3a) and a central beam (3b), installing an end beam (3a) in the side span and installing a central beam (3b) in the middle section of the trunk;
Continuously installing the pi (π) type PC slab (1) on top of the beams (3a) (3b);
A tension member 4 is disposed between the pi-type PC slab 1 and the adjacent pi-type PC slab 1 in the longitudinal direction of the pi-type PC slab 1, and the pi (π) Placing concrete after placing the reinforcing bar on the upper part of the) -type PC slab 1;
And squeezing the tension member (4) after the pour concrete is cured to form the topping concrete (5). The compounding method using the pi (π) type PC slab, characterized in that it comprises a.

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