KR100760393B1 - Precast concrete panel and method for constructing a slab using the panel - Google Patents

Abstract

A precast concrete panel and a method for constructing a slab using the panel are provided to preclude the precast concrete panel or a large beam from being damaged due to the compression force, and to prevent a doping concrete from being cracked by arranging the connecting hardware at two corner parts of the plate body. Split type small beams(20,30) are formed along the periphery of a lower part of a plate body(10). A plurality of connecting hardware(40) is exposed to two corner parts of the upper part of the plate body at equal intervals in the longitudinal direction. At least one lateral small beam is formed perpendicular to a vertical small beam, and connected with the split type small beams. At least one projection type reinforcing bar unit is installed on the plate body.

Description

Precast concrete panel and method for constructing a slab using the panel}

1 is a perspective view of a conventional precast concrete panel

Figure 2a is a side cross-sectional view showing a state in which the slab construction using a conventional precast concrete panel

Figure 2b is a front sectional view showing a state in which the slab construction using a conventional precast concrete panel

Figure 3 is a perspective view of the precast concrete panel of the present invention

Figure 4a is a side cross-sectional view showing a precast concrete panel of the present invention

Figure 4b is a front sectional view of the precast concrete panel of the present invention

5 is a front sectional view showing a precast concrete panel having a protruding rebar unit on the upper part of the plate body;

6 is a perspective view of a precast concrete panel in which length-type key grooves are formed in front and rear side split beams.

Figure 7a shows a modified embodiment of the present invention, showing a precast concrete panel having a longitudinal side beams in a bottom view

FIG. 7B is an enlarged sectional view taken along line II of FIG. 7A

Figure 8a shows another modified embodiment of the present invention, showing a precast concrete panel having a transverse side beams in a bottom view

8B is a cross-sectional view taken along the line II-II of FIG. 8A.

Figure 9 is a side cross-sectional view showing a state in which the slab construction using the precast concrete panel of the present invention

Fig. 10 is an enlarged cross-sectional view of the section “III” of Fig. 9;

11 is an enlarged cross-sectional view taken along line IV-IV of FIG.

12 is a partially enlarged cross-sectional view illustrating a state in which the slab to be cast in the field is connected to the slab constructed by using the precast concrete panel of the present invention

<Description of the symbols for the main parts of the drawings>

P: precast concrete panel 10: plate part

11: wire mesh 12: protruding rebar unit

13: chin 20: split small beam of front and back

21: keyway 30: split small beams on both sides

31: keyway 32: tension material

40: connecting hardware 41: buried part

42: ring 43: reinforcing bar

50: longitudinal side beam 60: lateral side beam

G: Big beam G ₁ : step

T ₁ : topping concrete T ₂ : rebar

The present invention relates to a precast concrete panel for constructing a slab, and in particular, to improve the structural stability and construction quality during the construction of the slab, precast concrete panel and a method of constructing the slab using the same to continuously maintain the continuity It is about.

The slab of the conventional building is constructed by the site casting type slab method that installs the formwork directly at the construction site, reinforces the steel, and then casts the concrete to be integrated with the large beam, or within the mold prepared at the factory or the work site around the site. It has been constructed by prefabricated slab method to assemble precast concrete members manufactured by placing prestresses after reinforcing reinforcing bars and mounting them on large beams pre-installed at the corresponding work positions.

When the slab is constructed by the electronic cast-in-place slab method, the slab and the large beam are integrated so that the quality of construction is excellent.However, due to the cumbersome and cumbersome work of installing and dismantling the formwork directly at the construction site, Not only the professional manpower is required, but there is a problem in that the construction period for pouring and curing concrete is excessively required.

When the slab is constructed by the latter prefabricated slab method, since the precast concrete member manufactured at the factory is mounted on the pre-installed big beam, it is assembled and installed, and thus the workability is excellent, while not only between precast concrete members. However, it has been pointed out that the weakness of the integrity between the precast concrete member and the large beams is weak.

On the other hand, in recent years to construct a slab of the building, as shown in Figure 1, the pre-stress is made to be introduced from the reinforced concrete as a whole material, but the plate body portion (1a) is formed flat to the required thickness and area, Precast concrete panel 1 (half precast) composed of a plurality of small beams 1b protruding downwards at intervals in the middle of the lower surface of the plate body 1a at intervals in the middle in the width direction, and having a stepping wall 1b 'formed at the front and rear ends thereof. Also called concrete) has been developed.

This precast concrete panel (1) is a slab method (hereinafter referred to as slab method using precast concrete panel) that combines the advantages of the previous cast-in-place slab method and the prefabricated slab method. I gave it.

That is, the slab method using the precast concrete panel will be described in detail, as shown in Figs. 2a and 2b, the front and rear ends of the small beam (1b) to the step (2a) of the large beam (2) pre-installed at the corresponding position Assembled so that the neighboring precast concrete panels (1) are connected while the mounting step (1b ') formed on the top, and the reinforcing bar (3a) on the top of the assembled precast concrete panels (1) after the topping concrete (3) on-site casting the slab (S) was constructed.

According to the slab method using a conventional precast concrete panel, such as reinforcing the reinforcing bar (3a) on the top of the precast concrete panels (1) assembled while mounting on the large beam (2) by placing the topping concrete (3) The construction of the slab (S) eliminates the use of formwork that is cumbersome and cumbersome in the previous cast-in-place slab method, which not only improves the constructability, but also weakens the integrity pointed out in the prefabricated slab method. There was an advantage such as to solve.

However, since the conventional precast concrete panel 1 has a configuration in which the small beam 1b having the stepped jaw 1b 'is formed to protrude from the thin plate body portion 1a in the middle of the width direction, the slab ( The construction of S) entailed the following problems.

First, since the small beam 1b is stretched through the stepped wall 1b 'to the step 2a of the large beam 2, the mounting state of the precast concrete panel 1 is very poor, and thus the slab S is completed. When the load is transferred from the topping concrete (3) to the precast concrete panel (1), as shown in Figure 2a, the middle part of the precast concrete panel (1) is stretched and sag before and after As a result of being raised, the front and rear ends of the small beams 1b apply a large compressive force locally to the large beams 2, whereby the precast concrete panel 1 or the large beams 2 may be damaged by the compressive force. In addition, there was a serious problem that the topping concrete (3) covered on the upper portion between the precast concrete panel 1 and the large beam (2) is floating to cause a crack.

Second, since the small beams 1b are arranged in the width direction central part of the plate body part 1a, when the load by the weight goods piled on the completed slab S is biased to either side, precast concrete Since the panels 1 do not efficiently handle the eccentric loads transmitted through the topping concrete 3, there is a problem that cracks are easily generated at the joints between the precast concrete panels 1.

Third, the precast concrete panels 1 mounted on the large beams 2 are joined to each other in a dry structure using a fixed iron piece 1c and a caulking material 1d against the plate body portion 1a having a relatively small thickness. Since the joints of the precast concrete panels 1 installed are very fragile, there is a problem that the precast concrete panels 1 lose their continuity as time passes after construction.

The present invention is to be arranged in the split girder around the lower part of the plate, and to configure the connecting hardware is arranged at both corners of the plate, first improve the mounting state of the precast concrete panel to improve the structural stability of the slab The main purpose is to provide a precast concrete panel and a construction method of the slab using the same. Second, the purpose of the present invention is to provide a precast concrete panel and a method of constructing a slab using the same, which significantly improves the construction quality of the slab by increasing the joint rigidity between the precast concrete panels. Thirdly, it is an object of the present invention to provide a precast concrete panel and a method of constructing a slab using the same, so that the precast concrete panels can be firmly connected and connected to each other by a wet structure.

The present invention is also made so that the pre-stress is introduced from the reinforced concrete as a whole, and the technical concept is the same as the conventional one in that it has one or more small beams in the lower portion of the plate body having the required thickness and planar area.

However, the precast concrete panel (P) of the present invention is provided with split type beams (20, 30) protruding to have a width of the half beam size around the lower portion of the plate body portion 10, the plate The technical configuration is characterized in that it is installed so that the plurality of connecting hardware 40 is exposed at equal intervals in the longitudinal direction at both corners of the upper portion 10.

In the drawings, reference numeral H denotes a pillar.

Hereinafter, the technical details of the present invention through the specific embodiments shown in the accompanying drawings in detail.

In this embodiment, as shown in Figures 3 to 4b, the plate body portion 10 having the required thickness and the planar area, the front and rear split type protruding to face the front and rear ends of the lower portion of the plate body portion 10 Small beams 20, the split-shaped beams 30 on both sides protruding to face the left and right ends of the lower portion of the plate body 10, arranged to be exposed to both side corners of the upper portion of the plate body 10 Is illustrated as consisting of a plurality of connecting hardware (40).

In addition, the plate part 10, the front and rear divided beams 20, and the divided beams 30 on both sides are embedded reinforcing bars (P ₁ ) orthogonal to the cross-sectional shape so as to correspond to the cross-sectional shape. They are embedded in the cross-section by the reinforcement, it is formed of the coated concrete (P ₂ ) which is cast-poured so that the embedded reinforcing bars are covered.

The plate portion 10 has a design section thickness and may be formed of a flat plate body having an upper and a lower surface. The plate portion 10 provides a planar surface on which the topping concrete T ₁ can be poured during the construction of the slab S, and at the same time, supports the topping concrete T _{1 that has} been poured after the construction of the slab S. .

In addition, in the cross section of the plate portion 10 by embedding a wire mesh 11 horizontally directly on the upper portion of the buried reinforcement (P ₁ ), so as to prevent the occurrence of minute cracks in the plate portion 10 itself. do.

As shown in FIG. 5, it is apparent that one or more protruding rebar units 12 may be provided on the upper surface of the plate body 10 in the width direction. The protruding rebar unit 12 is embedded in the topping concrete (T ₁ ) to be poured after connecting with the reinforcing bars (T ₂ ) to be reinforced on the precast concrete panel (P) during the construction of the slab (S), precast It helps to increase the integrity between the concrete panel (P) and the topping concrete (T ₁ ).

At this time, the protruding reinforcing unit 12 has a lower end embedded in the cross section of the plate portion 10 and the upper end is inclinedly exposed to the upper portion of the plate portion and a pair of bent reinforcing bars 121 facing each other, one pair Consists of a horizontal reinforcement 122 is horizontally fixed to the upper portion of the curved reinforcement 121.

The front and rear split girder 20 is formed at the front and rear ends of the lower portion of the plate 10, respectively, and the inner side forms a slanted surface of the upper and lower straits, and the outer side is formed in a protrusion forming a vertical plane.

The split beams 20 at the front and rear sides may be formed to protrude to have a width of a half of a normal beam in the width direction at the front and rear ends of the plate body 10, as shown in FIG. 4A. The former, dividing a small beam 20 of the rear side are, as shown in Figure 10, so over a stepped (G ₁₎ of keunbo (G) so mounted to be connected to the keunbo with a larger area, slab construction is complete Even if a large load is applied by the heavy material loaded in (S), the middle part of the precast concrete panel P is tensioned and the front and rear ends are prevented from being lifted, and the compressive force applied to the large beam G is dispersed. The topping concrete (T ₁ ) covered on the upper part between the precast concrete panel (P) and the large beam (G) prevents the cracks from occurring, and prevents the occurrence of cracks, and the precast concrete panel (P) or the large beam (G). ) Is prevented from being damaged by the compressive force.

In addition, key grooves 21 are formed on the outer surfaces of the split girder 20 on the front and rear sides, respectively. The key groove 21 has, as shown in Figure 10, the slab (S) construction when keunbo (G) and the former, dividing a small beam (20) topping to be charged when the cast-in-place in the gap between the rear side of concrete (T ₁ ) Is hardened by the inflow hardening to play the role of shear key.

At this time, the key groove 21, as shown in Figure 3, the individual type is inserted into the outer surface of the split type beams 20 of the front, rear at equal intervals, or the split type of the front, rear as shown in Figure 6 The small beams 20 may be provided by selecting any one of the length-type recessed in the longitudinal direction.

The split beams 30 on both sides are integrally formed at both side ends of the lower portion of the plate body 10, and the inner side forms a slanted surface of the upper and lower straits, and the outer side forms a protrusion having a vertical surface.

In addition, the divided beams 30 on both sides may protrude to have a width of a normal beam size in the longitudinal direction at both ends of the lower portion of the plate portion 10, as shown in FIG. 4B.

Since the divided small beams 30 on both sides are arranged to have the maximum width of the plate body 10 as shown in FIG. 11, the load due to the heavy material placed on the completed slab S is biased to either side. Even if a phenomenon occurs, the load that is received through the topping concrete (T ₁ ) is effectively handled to prevent the occurrence of cracks at the joints between the precast concrete panels (P).

In addition, key grooves 31 may be formed on outer surfaces of the split girder 30 on both sides. As shown in FIG. 11, the key groove 31 is a non-shrink mortar that is separately filled between the divided small beams 30 of the precast concrete panels P facing each other at intervals when the slab S is constructed. M) is hardened by inflow, and it plays the role of shear key.

At this time, the key groove 31, as shown in Figure 3, the divided type beams on both sides of the split type beams at equal intervals or as shown in Figure 6, as shown in Figure 6, split type beams 30 on both sides It may be provided by selecting any one of the length type that is long indented in the longitudinal direction on the outer surface.

In addition, the tension members 32 are buried in a tension state at equal intervals in the vertical direction from the cross-sections of the divided beams 30 on both sides to the divided beams 20 on the front and rear sides, so as to bury the tension members 32 in the tension state. Prestress is introduced into the split type beams 30 and the plate portion 10 as well as the front and rear split beams 30.

The connecting hardware 40 is to be installed at equal intervals in the longitudinal direction at both corners of the upper plate portion 10.

And, as shown in Figure 3 and 4b, the connecting hardware 40 is embedded in the end portion of the plate body portion 10 is embedded in the horizontal section 41, and from the embedded portion of the plate body portion 10 It is formed to have a ring portion 42 protruding outwardly bent upward.

These connecting hardware 40, as shown in Figure 11, during the construction of the slab (S) after the split-shaped beams 30 on both sides of the neighboring precast concrete panels (P) face each other at intervals, both sides Precast concrete panels can be firmly connected and connected in a wet structure so as to penetrate the reinforcing bars 43 in the center of the overlapping ring portion 42 and to be embedded in the topping concrete T ₁ to be cast in place. The joints of P) keep continuity without loosening even after the construction time.

Here, it is preferable to have a step portion 13 formed stepwise in the longitudinal direction at both corners of the upper portion of the plate body portion 10 adjacent to the connection hardware 40. The stepped portion 13, as shown in Figure 11, when the construction of the slab (S), the connection hardware 40 of the precast concrete panels (P) are overlapped on both sides connected to the site by the insertion reinforcement 43 It is made to be embedded in the thickness of the coating in the topping concrete (T ₁ ) to be poured.

In addition, as shown in FIG. 12, when the slab 100 constructed of reinforced concrete to be cast in the field is to be connected to the topping concrete T ₁ placed on the upper part of the precast concrete panel P, the slab 100 The end portion of the step (13) over the form allows to be stably connected construction.

7a and 7b show a modified embodiment of the present invention, the longitudinal side beams protruding in the middle of the width direction of the lower portion of the plate portion 10 and connected to the divided beams 20 of the front and rear sides ( It is made by forming one or more 50). The longitudinal side beams 50 structurally reinforce the plate part 10 and the split type beams 20 at the front and rear sides thereof, and are precast concrete panels P positioned below the slab S in which construction is completed. ) Has the advantage of improving the load carrying capacity.

The longitudinal girder 50 has a width comparable to that of a normal girder and may be formed in a protrusion shape on which both sides form an inclined surface of a light beam narrower.

In addition, the longitudinal girder 50 is to be embedded in the cross-section by reinforcing the reinforcing bars (P ₁ ) orthogonal to the cross-sectional shape to correspond to the cross-sectional shape, to the coated concrete (P ₂ ) to be cast-poured so that the embedded reinforcing bars are covered. It can be formed.

Here, the longitudinal beam 50 is preferably buried in the tension state in the tension member 51 at equal intervals in the vertical direction from the cross section to the split type beam 20 in the front, rear.

8A and 8B illustrate another modified embodiment of the present invention, and protrude to be perpendicular to the longitudinal girder 50 in the width direction of the lower portion of the plate portion 10 so as to divide the divided girder 30 on both sides. It is made by forming one or more transverse side beams 60 connected to the field. The lateral beam 60 is structurally reinforced with the plate 10 and the divided beams 30 on both sides together with the longitudinal beam 50, the lower position of the slab (S) completed construction The precast concrete panel (P) has the advantage of further increasing the load carrying capacity.

The lateral beam 60 has a width comparable to that of a normal beam and is formed in a protrusion shape on which both sides form an inclined surface of a light beam narrower.

In addition, the lateral side beams 60 are buried in the cross-section by reinforcing the reinforcing bars (P ₁ ) vertically orthogonal to correspond to the cross-sectional shape, but the coated concrete (P ₂ ) to be cast-poured to cover the buried reinforcing bars It can be formed.

Hereinafter, the construction method of the slab using the precast concrete panel of the present invention will be described.

The present invention is also assembled in precast concrete panels while mounting on the step of the pre-installed gibbo in the corresponding position, after reinforcing the reinforcing bar on top of the assembled precast concrete panels in the point of construction of the slab to the site of the topping concrete The concept of technology is the same as that of

However, in the construction method of the slab using the precast concrete panel of the present invention, as shown in Figures 9 to 11, the precast concrete panels (P), respectively, a typical small beam around the lower portion of the plate portion 10 Split girder 20 and 30 protrudingly formed to have a width of half size, and a plurality of connecting hardware 40 exposed at equal intervals in the longitudinal direction at both corners of the upper portion of the plate body 10. Formed and fabricated to have, precast concrete panels (P) are mounted on the stepped beams (G ₁ ) of the girder (G) across the split girder (20) formed at the front and rear, respectively, the girder (G) and Between the precast concrete panels (P) is filled with topping concrete (T ₁ ) is cast in the field is connected and bonded, the precast concrete panels (P) between the divided small beams formed at both ends of the ) Are spaced from each other For so it characterized on the sheathed insertion for rebar 43 to pass through the connection hardware (40) that overlaps the field that the cast-in-place concrete topping (T ₁₎ Knowledge that the connection joint to be embedded within the configuration.

At this time, the non-condensation mortar (M) before filling the topping concrete (T ₁ ) between the split type beams 30 of the precast concrete panels (P) adjacent to each other, and the It is preferable to seal the backing material (B) and the caulking material (C) one after the other by shrinking mortar.

In addition, the upper surface of the plate body portion 10 of the precast concrete panel (P) is provided with at least one protruding reinforcing bar unit 12 is installed in the width direction, precast concrete panel (P) during the construction of the slab (S) After being connected to the reinforcing bar (T ₂ ) on the reinforcement to be embedded in the topping concrete (T ₁ ) to be cast in the field, to increase the integrity between the precast concrete panel (P) and the topping concrete (T ₁ ).

In addition, the outer surface of the divided small beams 20 of the front and rear of the precast concrete panel (P) is provided with a key groove 21 is formed in the form of a single or length concave, when the construction of the slab (S) Topping concrete (T ₁ ) to be filled during in-site casting in the gap between the (G) and the split type small beam 20 of the front and rear is inlet hardened to cover the role of the shear key.

In addition, the outer surface of the divided small beams 30 on both sides of the precast concrete panel (P) is provided with a key groove 31 formed in the form of a single or length concave, neighboring each other during the construction of the slab (S) The non-shrink mortar (M), which is separately filled between the split girder 30 of the precast concrete panels (P) facing each other inlet hardened to cover the role of the shear key.

In addition, the stepped portion 13 is formed to be stepped in the longitudinal direction at both corners of the upper portion of the plate body portion 10 adjacent to the connecting hardware 40 of the precast concrete panel (P), Figure 11 as in the slab (S) construction the pre-cast concrete panel (P) connecting hardware 40 are superimposed on both sides it is drilled to a connected state by for insertion Perforated reinforcement 43 topping concrete of the (T ₁ ) To be embedded at the thickness of the coating, and as shown in Figure 12, to connect the slab constructed of reinforced concrete to be cast in the field to the topping concrete (T ₁ ) placed on top of any precast concrete panel (P) E, the end portion of the slab 100 is formed to span the stepped portion 13 allows to be stably connected construction.

According to the construction method of the precast concrete panel and the slab using the same according to the present invention, by configuring the precast concrete panel so that the connection hardware is arranged at both corners of the plate portion, to improve the mounting state and increase the joint stiffness At the same time, by allowing the construction to be connected firmly in a wet structure, the split beams protruding from the front and rear ends of the lower part of the plate portion over the step of the first beam, so that the large beams and the split beams can be connected to a large area. Since it is mounted on the slab, it is possible to prevent the front and rear ends of the precast concrete panels from being lifted even when the load by the heavy material loaded on the finished slab is applied, and to distribute the compressive force applied to the large beams. The topping concrete covered in the upper part between the big beams is excited, causing cracks. At the same time, which prevented that, precast concrete panels or large beams phenomenon being damaged by compression has the advantage that by preventing balsaengdoem.

Second, since the divided beams on both sides are disposed to the maximum width of the plate body, even if a phenomenon occurs in which the load due to the heavy material placed on the completed slab is biased to either side, the protrusion formed on both side ends of the plate body. Since the shaped beams efficiently handle the eccentric loads received through the topping concrete, there is an advantage of preventing cracks in the joints between the precast concrete panels.

Third, the precast concrete panels mounted on the big beams are formed to protrude on both ends of the plate, so that they are connected to each other by connecting pieces with large split type beams, and the connecting pieces are embedded in the topping concrete which is subsequently poured. Since the connection is connected in a wet structure, the joints of the precast concrete panels assembled and installed are robust, and thus there is an advantage that the continuity can be maintained without being relaxed even after a period of time after construction.

As described above, in the present invention, the split girder is arranged around the lower part of the plate part, and the connecting hardware is arranged at both corners of the plate part, so that the precast concrete panel or the big beam is damaged by the compressive force. To prevent the occurrence of cracks, the topping concrete covered between the top of the precast concrete panel and the large beams to prevent the cracks generated, to prevent the cracks generated at the joint between the precast concrete panels, precast concrete It is an invention having useful effects such as maintaining the continuity without loosening the joints of the panels.

Claims (6)

In general, the prestress is made of reinforced concrete, and is configured to have one or more small beams in the lower portion of the plate body having a required thickness and a planar area. The divided beams 20 and 30 protrudingly formed to have a width of the half beam size around the lower portion of the plate body portion 10, and in the longitudinal direction at both corners of the upper portion of the plate body portion 10 Installed to expose the plurality of connecting hardware 40 at equal intervals, Protruding in the middle of the width direction of the lower portion of the plate portion 10 to form one or more longitudinal beams 50 connected to the front and rear divided girdle 20, the lower portion of the plate portion 10 Precast concrete panel, characterized in that the protruding orthogonal to the longitudinal girder 50 in the width direction of the at least one transverse girder (60) connected to the divided girder 30 on both sides . The precast concrete panel according to claim 1, wherein at least one protruding rebar unit (12) is installed on the upper surface of the plate body (10) in the width direction. The precast concrete panel according to claim 1, further comprising stepped portions (13) which are stepped in the longitudinal direction at both corner portions of the upper portion of the plate portion (10) adjacent to the connecting hardware (40). delete delete In assembling the precast concrete panels while mounting on the step of the pre-installed large beam at the corresponding position, reinforcing the reinforcing bar on top of the assembled precast concrete panels, and then placing the topping concrete on site to construct the slab, The precast concrete panels (P) and the divided beams (20, 30) are formed to protrude to have a width of a half of the usual small beam around the lower portion of the plate portion 10, and the plate portion 10 It has a plurality of connecting hardware 40 which is exposed at equal intervals in the longitudinal direction at both corners of the upper portion, and protrudes in the middle of the width direction of the lower portion of the plate portion 10 divided split beams of the front and rear ( One or more longitudinal beams 50 connected to each other are formed and protrude to be perpendicular to the longitudinal beams 50 in the width direction of the lower portion of the plate body 10 so as to divide the split beams on both sides ( By forming and forming so that at least one side girder 60 is connected to the 30, The stepped in keunbo (G) (G ₁₎ to the former, and over the dividing small beam 20 formed at the rear end, respectively through the pre-cast concrete panel (P), the keunbo (G) and the pre-cast concrete panels (P) between the topping concrete (T ₁ ) to be cast in the field is filled and connected to each other, the precast concrete panel (P) between the divided small beams 30 formed on both sides of the space between each other Inserting the reinforcing bar 43 to penetrate through the connecting hardware 40 overlapping with each other, and the connection of the slab using a precast concrete panel, characterized in that the connection to be embedded in the topping concrete (T ₁ ) Construction method.

Images