KR102247070B1 - Installation structure of hollow core slab - Google Patents

Abstract

The installation structure of the hollow slab (Hollow Core Slab, HCS) according to the present invention is a RC rib or RC rib by installing a support member (deck plate, PC plate, etc.) and shear reinforcing bars in the structurally weak areas between the PC slabs and pouring on-site topping concrete. To form a composite rib.
Accordingly, the present invention increases the stiffness of the part between the PC slabs, reinforces shear resistance in the vertical and horizontal directions, allows the slab ends to be connected continuously, prevents cracking of the PC slab connection part, and reduces the amount of PC. have. In addition, since the support member is installed so as to span the PC slabs on both sides, the cast-in-place concrete load acting on the support member is transmitted to the PC slabs on both sides. In addition, since the amount of deflection of the PC slab and the supporting member is the same after the pouring and curing of the cast-in-place concrete, the smoothness of the lower surface can be secured. Furthermore, it is possible to control the amount of excessive camber (rising due to prestress) of the PC slab, and the support member is manufactured in a length of about 600mm to 4000mm and then installed by inserting it between the PC slabs, so it may not be affected by the camber. have.

Description

Installation structure of hollow core slab

The present invention relates to an installation structure of a hollow slab, and more specifically, after installing a support member (deck plate, PC plate, etc.) and a shear reinforcing bar in the structurally weakened portion between the hollow slabs (hollow core slab, HCS) By pouring on-site topping concrete to form RC ribs or composite ribs, it increases stiffness, reinforces shear forces in the vertical and horizontal directions, enables continuous connection of the slab ends, prevents cracks in the connection part of the PC slab, and reduces the amount of PC. It relates to the installation structure of the hollow rib slab.

In general, as a method of constructing a slab, a method of making a slab by installing a formwork at the site and pouring concrete, and a method of making a slab by pouring concrete at a factory and transporting it to the site for installation (precast concrete slab, PC) Slab).

Among the PC slabs, HCS (hollow core slab, hollow slab) has a hollow 2 formed elongated along the length direction of the slab, as shown in FIG. 1. In addition, protrusions 3 are formed at both ends of the HCS (1, hollow slab). The HCS (1) has a hollow (2) formed therein, so its own weight is small and its cross-sectional coefficient is large.

As shown in Figure 2, the HCS (1) is installed so that the protrusions (3) are in contact with each other, and the space (4) between the neighboring HCS (3) and the upper part of the HCS (1) concrete is poured at the construction site. do. In addition, both side surfaces of the HCS 1 are made of an upwardly inclined surface, and the upper width w1 of the space 4 is approximately 40mm to 44mm.

However, this installation structure is very difficult to install the shear reinforcement. Specifically, in order to install the shear reinforcement, as shown in Fig. 3, a part of the HCS (1) is cut and the shear reinforcement (5) is installed in the hollow (2), and then the hollow (2) is filled with concrete. However, this method has a problem that it takes a lot of work time and cost.

In addition, the installation structure has a problem that the bending moment cannot be transmitted because both ends of the HCS (1) form a pin connection with the end of the neighboring HCS (1), and the connection portion of the HCS (1) lacks rigidity. It also has a problem that it is easy to generate cracks.

Furthermore, in the above installation structure, all loads acting on the HCS (1) are transferred to the girders (not shown in the drawing) connected to both ends of the HCS (1). There is also a problem in that the slab of can behave differently, which is disadvantageous to cracking.

The present invention has been proposed to solve the above problems, and after installing a support member (deck plate, PC plate, etc.) and shear reinforcing bars in a structurally weak part between the PC slabs, by pouring on-site topping concrete, RC ribs or composite ribs Its purpose is to provide an installation structure of a slab, forming a structure.

Another object of the present invention is to provide a slab installation structure in which the load of cast-in-place concrete acting on the support member is transmitted to the PC slab on both sides.

Another object of the present invention is to ensure the smoothness of the lower surface since the amount of deflection of the PC slab and the supporting member is the same after the pouring and curing of the on-site concrete, and to control the amount of excessive camber (rising due to prestress) of the PC slab. It is intended to provide a slab installation structure that is not affected by camber because the unit assembly including the support member and shear reinforcement is manufactured in a length of about 600mm to 4000mm and then installed in a way that is inserted between the PC slabs. .

Another object of the present invention is to provide a slab installation structure that is easy to install shear reinforcing bars.

Another object of the present invention is to provide a slab installation structure in which a bending moment can be transmitted at a connection portion between PC slabs.

Another object of the present invention is to provide a slab installation structure that prevents cracks from occurring at the connection portion between PC slabs and reduces the amount of precast concrete (PC).

Another object of the present invention is to provide a slab installation structure that is light in weight and has a large cross-sectional coefficient because a hollow is formed inside the PC slab.

In order to solve the above problem, a slab installation structure according to a preferred embodiment of the present invention includes a plurality of PC slabs 10 installed to be spaced apart at predetermined intervals in the width direction; RC ribs 55 or composite ribs 155 formed between the PC slabs 10; And, on-site topping concrete part 50 formed on the ribs 55 and 155 and the PC slab 10.

The RC rib 55 or the composite rib 155 is made by pouring on-site topping concrete after a reinforcing bar assembly is installed between both PC slabs 10.

The reinforcing bar assembly includes: a support member 41, 141 installed between the PC slabs 10 and forming a space 30 in which field topping concrete is poured together with both PC slabs 10; And, a reinforcing bar unit installed in the space 30; may include. The reinforcing bar unit may have various configurations. For example, the reinforcing bar unit may include first and second shear reinforcement bars 44 and 45.

The first shear stiffener 44 is installed in the width direction of the PC slab 10 at predetermined intervals along the length direction of the PC slab 10. The first shear reinforcement 44 resists shear forces in the vertical and horizontal directions. In addition, the second shear reinforcement bar 45 is installed between both PC slabs 10 in a direction perpendicular to the first shear reinforcement bar 44.

The lower surfaces of the support members 41 and 141 are installed at substantially the same height as the lower surfaces of the PC slabs 10 on both sides, and the support members 41 and 141 may have a width of 150 mm to 1200 mm.

The reinforcing bar assembly may have substantially the same length as the length of the PC slab 10, but a plurality of unit assemblies 40 and 140 may be continuously installed between the PC slabs 10. The unit assemblies 40 and 140 may have a length of 600mm to 4000mm.

The first shear reinforcement muscle 44 has a central portion forming a lower end and both ends forming an upper end, the lower end is located in the lower portion of the space 30 or is located inside the support member 41, 141, and the upper end is both PCs It may span the upper surface of the slab 10 or extend upwards than the space 30.

The second shear reinforcement 45 may be a lattice reinforcement extending along the longitudinal direction of the PC slab 10. The lower end of the lattice reinforcement may be located inside the support members 41 and 141 and the upper end of the lattice reinforcement may extend upward than the space 30.

When the rib is the RC rib 55, the support member 41 may be made of any one of a deck plate, FRP, plastic, cement board, metal plate, galvanized steel plate, and wood. The support member 41 has a closed lower surface and both side surfaces, and has an open upper surface, and a lower end of the first shear reinforcing bar 44 may extend into the support member 41 through the open upper surface.

Engaging portions 41a may be formed at both ends of the support member 41. The locking part 41a is spanned over the side step jaws 16 of the PC slabs 10 on both sides, and thus at least a portion of the load acting on the support member 41 may be transmitted to the PC slabs 10 on both sides.

A support bar 48 is installed on the open upper surface of the support member 41 in the width direction of the PC slab 10 to support the load and prevent the support member 41 from being deformed.

When the rib is a composite rib 155, the support member 141 may be a PC plate made of precast concrete. The lower end of the first shear reinforcing bar 44 may be buried in the inside of the PC plate.

The upper end of the first shear reinforcing bar 44 extends above the space 30, and a support member 141 and a load-bearing reinforcing bar 142 for supporting the load of the field topping concrete may be provided. The central lower end of the load-bearing reinforcing bar 142 is buried in the support member 141, and the upper ends of both ends of the load-bearing reinforcing bar 142 are over the PC slab 10, and at least some of the load acting on the support member 141 is It can be transferred to the PC slab 10 on both sides.

The slab installation structure according to the present invention has the following effects.

1. After installing support members (deck plate, PC plate, etc.) and shear reinforcement in the structurally weak areas between the PC slabs, pouring on-site topping concrete to form RC ribs or composite ribs to increase stiffness and increase the rigidity in the vertical and horizontal directions. It reinforces the shear resistance of and can connect the slab ends continuously.

2. The load of cast-in-place concrete acting on the supporting member can be transmitted to the PC slabs on both sides.

3. After pouring and curing of cast-in-place concrete, the amount of deflection of the PC slab and the supporting member is the same, so the smoothness of the lower surface can be secured.

4. It is possible to control the amount of excessive camber (rising due to pre-stress) of the PC slab, and the unit assembly including the support member and shear reinforcement is manufactured in a length of about 600mm to 4000mm, and then installed by inserting between the PC slabs. Therefore, it may not be affected by camber.

5. It is easy to install shear reinforcement.

6. The bending moment can be transmitted at the connection between the PC slabs.

7. It can prevent cracks from occurring in the connection part between PC slabs and reduce the amount of PC (precast concrete).

8. Since a hollow is formed inside the PC slab, the weight is light and the section modulus is large.

1 is a cross-sectional view showing a hollow core slab (HCS) according to the prior art.
FIG. 2 is a cross-sectional view showing that the HCS of FIG. 1 is continuously installed and on-site topping concrete is poured on the continuously installed HCS.
Figure 3 is a cross-sectional view showing that the shear reinforcement is installed in the HCS of Figure 1;
Figure 4 is a cross-sectional view showing the installation structure of the HCS (hollow core slab, PC slab) according to the first embodiment of the present invention, a reinforcing bar assembly (deck plate and the first and second shear reinforcement bars, etc. Assembly) is installed and on-site topping concrete is poured to form an RC rib.
Figure 5 is a perspective view showing the reinforcement assembly of Figure 4;
Figure 6 is an exploded perspective view showing the HCS and the reinforcement assembly of Figure 4;
Figure 7 is a front view showing the first shear reinforcement of Figure 4;
8a to 8c are front views showing a modified example of the first shear reinforcement.
Figure 9 is a side view showing the second shear reinforcement (lattice reinforcement) of Figure 4;
Figure 10 is a cross-sectional view showing the installation structure of the HCS (hollow core slab, PC slab) according to the second embodiment of the present invention, reinforcing bar assembly (PC plate and the first and second shear reinforcement bars, etc. Assembly) is installed and on-site topping concrete is poured to form a composite rib.
Figure 11a is a cross-sectional view showing the reinforcement assembly of Figure 10.
Figure 11b is a side view showing the reinforcement assembly of Figure 10.
12a to 12c are cross-sectional views sequentially showing the construction process of the installation structure of FIG.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only examples of the present invention, and do not represent all the technical spirit of the present invention, and various equivalents that can replace them at the time of application It should be understood that there may be variations and variations.

Hereinafter, in order to explain the present invention, on-site topping concrete is poured on an HCS (hollow slab) to form an RC rib or a composite rib to be described as an example. However, the technical idea according to the present invention is not limited to HCS (hollow slab) and can be applied to general PC slab. That is, a reinforcing bar assembly (an assembly such as a support member and the first and second shear reinforcing bars) is installed between a plurality of PC slabs spaced apart at predetermined intervals, and on-site topping concrete is poured to form an RC rib or a composite rib. This point will be readily apparent to those skilled in the art with reference to the following.

[First embodiment]

Figure 4 is a cross-sectional view showing the installation structure of the HCS according to the first embodiment of the present invention, after the reinforcing bar assembly is installed between the HCS installed at predetermined intervals, on-site topping concrete is poured and RC ribs (reinforced concrete ribs) Is a cross-sectional view showing that is formed. And, Figure 5 is a perspective view showing a reinforcing bar assembly, Figure 6 is an exploded perspective view showing the HCS and the reinforcing bar assembly.

Referring to the drawings, the installation structure 100 of the HCS (hollow core slab) is formed on the HCS (10), the RC rib 55 formed between the HCS (10), the HCS (10) and the RC rib (55). Including the on-site topping concrete section 50.

The HCS (hollow core slab) 10 includes a body 11 formed elongated in the longitudinal direction (x direction) and side step jaws 16 formed on both sides of the body 11. The body 11 and the side step jaws 16 are integrally formed.

The upper part of the body 11 is installed so that the upper reinforcing bar 17b extends long along the longitudinal direction of the HCS 10, and the lower reinforcing bar 17a is installed at the lower part of the body 11 along the longitudinal direction of the HCS 10. It can be installed to extend. Preferably, the prestress may be applied in advance to the lower reinforcing bar (17a).

When the prestress is applied in this way, a camber (not shown in the drawing) in which the central portion in the longitudinal direction of the HCS 10 is convex may be formed.

Inside the body 11, the hollow 12 is formed to extend long along the longitudinal direction (x direction) of the HCS 10. Although the figure shows an elliptical hollow 12 having a long vertical axis, the hollow may be formed in various shapes such as an oval, hexagonal, pentagonal, etc. with a long horizontal axis, and the number and cross-sectional area may be increased or decreased as needed.

Both sides of the body 11 in the width direction (y direction) may be formed of an upper surface 13, a central surface 14, and a lower surface 15. And, the upper surface 13, the central surface 14, and the lower surface 15 are each made substantially vertical, but the central surface 14 is located inside the upper and lower surfaces 13, 15, and the lower surface (15) is located on the outermost side. Accordingly, a side step jaw 16 is formed between the central surface 14 and the lower surface 15. The side step jaw 16 is installed so that the locking part 41a of the support member 41 is caught and supported.

Preferably, irregularities (not shown in the drawings) may be formed on both sides of the body 11. The unevenness prevents the relative rotation of the HCS 10 and the RC rib 55.

The HCS 10 is installed so as to be spaced apart at predetermined intervals in the width direction (y direction). It is preferable that the interval is 150mm to 1200mm, in which a reinforcing bar assembly is installed.

형상의 공간(30)을 형성한다. 그리고, 공간(30)에는 제1,2 전단 보강근(44)(45) 등이 설치된 후 현장 토핑 콘크리트가 채워져서 RC 리브(55)가 형성된다. 이와 같이, HCS(10)와 지지부재(41)는 추후 현장 토핑 콘크리트를 타설하기 위한 거푸집 역할도 하므로, 현장 토핑 콘크리트를 타설하기 위하여 별도의 거푸집을 설치할 필요가 없어진다.And, the side and the support member 41 of the neighboring HCS (10)

A shaped space 30 is formed. In addition, after the first and second shear reinforcement bars 44 and 45 are installed in the space 30, the RC rib 55 is formed by filling the site with topping concrete. In this way, since the HCS 10 and the support member 41 also serve as a formwork for pouring on-site topping concrete in the future, there is no need to install a separate formwork to pour on-site topping concrete.

The RC rib 55 is made by pouring on-site topping concrete after the reinforcing bar assembly is installed in the space 30. During construction (before the curing of the site topping concrete is completed), the load acting on the RC rib (55) is transmitted to the PC slabs (10) on both sides, and the RC rib (55) has a large number of unit assemblies. It cannot resist the directional bending moment (the bending moment acting in the longitudinal direction of the PC slab). On the other hand, after completion of construction (after curing of the site topping concrete is completed), the RC rib 55 resists the bending moment and shear force in the main direction.

The reinforcing bar assembly may be formed integrally, but a plurality of unit assemblies 40 may be continuously arranged.

Specifically, the reinforcing bar assembly may have substantially the same length as the HCS 10 (that is, although the reinforcing bar assembly may be integrally formed), but considering the camber of the HCS 10, a plurality of unit assemblies 40 are continuous. It is preferably arranged and made (that is, assembled reinforcing bar assembly). That is, when the center of the HCS 10 is convex upward due to the camber, when the support member 41 and the second shear reinforcement 45 have the same length as the HCS 10, the support member 41 and the second shear reinforcement ( 45) should be made to be convex upward, but it is difficult to manufacture in this way, so the reinforcing bar assembly is made up of a plurality of unit assemblies 40 and a plurality of unit assemblies 40 are continuous between both HCSs 10. However, when the HCS 10 has a length of 10 m, the unit assembly 40 preferably has a length of approximately 600 mm to 4000 mm.

If the length of the unit assembly 40 is less than 600 mm, the number of unit assemblies 40 is too large, which is not preferable. In addition, when the length of the unit assembly 40 exceeds 4000 mm, the HCS 10 is convex due to the camber, whereas the unit assembly 40 is straight, so it is not preferable.

The unit assembly 40 is lighter in weight and shorter in length than the integral reinforcing bar assembly, so it is convenient to transport and install on site, and it is advantageous because an operator can manually install it in a way that inserts it between both HCSs 10 by hand even if there is no separate device.

The unit assembly 40 may include a support member 41 and a reinforcing bar unit installed on the support member 41. The reinforcing bar unit is for reinforcing shearing force, and the like, and may have various configurations if it is installed between the HCS 10 on both sides to reinforce the shearing force. For example, the reinforcing bar unit may include first and second shear reinforcing bars 44 and 45, as shown in FIGS. 4 to 6.

The support member 41 is installed between the PC slabs 10 and forms a space 30 in which on-site topping concrete is poured together with the PC slabs 10 on both sides. And, the support member 41 is installed between the adjacent HCS (10), the lower surface is installed at substantially the same height as the lower surface of both sides of the HCS (10). Therefore, after the on-site topping concrete is poured and cured, the support member 41 and the HCS 10 have the same amount of deflection, so that the lower smoothness can be secured.

The support member 41 has a width substantially the same as the spacing between the HCSs 10, for example, 150mm to 1200mm, but has a width that can be inserted between the HCSs 10.

4-5, the support member 41 may be made by bending the deck plate. However, the present invention is not limited thereto, and the support member 41 may be made of any one of, for example, FRP, plastic, cement board, metal plate, galvanized steel plate, and wood, but is not limited thereto.

The support member 41 has a sealed bottom surface and both sides sealed and has an open top surface. A locking part 41a protruding in the lateral direction is formed on both side surfaces, and the locking part 41a is supported by being caught on the side step jaws 16.

In addition, the lower end of the first shear reinforcing bar 44 may extend into the support member 41 through the open upper surface. In addition, the lower end of the second shear reinforcement bar 45 may extend into the support member 41 through the open upper surface. In addition, the site topping concrete is filled into the support member 41 through the open upper surface.

Preferably, the support bar 48 is installed on the open upper surface of the support member 41 in the width direction (y direction) of the HCS 10 to support the load and prevent deformation. The support bar 48 is installed in the width direction of the HCS 10, and both ends thereof are coupled to the upper surface by welding or the like. The support bars 48 are installed at predetermined intervals along the longitudinal direction of the HCS 10.

The first shear reinforcing bars 44 are installed in the width direction (y direction) of the HCS 10, and are installed at predetermined intervals along the length direction (x direction) of the HCS 10. Preferably, in the unit assembly 40 installed at both ends in the longitudinal direction of the HCS 10, the first shear reinforcing bar 44 is relatively densely installed, and the unit assembly 40 installed in the center portion in the longitudinal direction of the HCS 10 ), the first shear reinforcement 44 may be installed at relatively wide intervals.

On the other hand, when the reinforcing bar assembly is an integral type, the first shear reinforcing bar 44 is relatively densely installed at both ends in the longitudinal direction of the HCS 10, and the first shear reinforcing bar 44 is relatively densely installed at the central portion in the longitudinal direction of the HCS 10. It can be installed at wide intervals.

The first shear reinforcing bar 44 reinforces shear forces in the vertical and horizontal directions, fixes the position of the second shear reinforcement bar 45, and prevents cracks from occurring at the connecting portion of the HCS 10.

와 같은 형상을 가질 수 있다. The first shear reinforcing bar 44 has its central portion forming a lower end and both ends forming an upper end, the lower end is located inside the support member 41 or is located in the lower portion of the space 30 and the upper end is both HCS (10). ), or may extend upwards than the space 30. Preferably, the first shear reinforcement 44 is as shown in Figure 7

It can have the same shape as.

More preferably, the first shear reinforcing bar 44 may further include a straight reinforcing bar 47 connecting the upper end. Reinforcing bars 47 are installed so as to span the upper surfaces of both HCS 10s.

The first shear reinforcement 44 may be made in various shapes, and FIGS. 8A to 8C show a modified example of the first shear reinforcement 41.

On the other hand, the second shear reinforcement 45 is installed to extend along the longitudinal direction of the HCS (10). Accordingly, the second shear reinforcing bar 45 is installed in a direction perpendicular to the first shear reinforcing bar 44.

The second shear reinforcing bar 45 has the same length as the support member 41. That is, the second shear reinforcing bar 45 extends from one end of the support member 41 to the other end.

The second shear reinforcement 45 may be a lattice reinforcement installed along the longitudinal direction of the HCS 10. As shown in Figure 9, the lattice reinforcement is a reinforcing bar for reinforcing shearing force between the HCS 10, so as to connect two horizontal reinforcing bars 45a and 45b and two horizontal reinforcing bars 45a and 45b. It includes a connecting reinforcement (45c) formed repeatedly mountains and valleys.

Preferably, the lower end of the second shear reinforcing bar 45 is located inside the support member 41 and the upper end of the second shear reinforcing bar 45 extends above the space 30.

The second shear reinforcing bar 45 may further include a lower reinforcing bar 46, and the lower reinforcing bar 46 is installed to extend along the longitudinal direction of the HCS 10 in the support member 41.

When the reinforcing bar assembly is an integral type, the second shear reinforcing bar 45 is installed to extend over the entire length L of the HCS 10, or a section of L/6 to L/3 from both ends of the HCS 10 (that is, , It may be installed only in the section in which the parental moment acts).

And, when the reinforcing bar assembly consists of a plurality of unit assemblies 40, the second shear reinforcing bar 45 is installed in all unit assemblies 40 or a section of L/6 to L/3 from both ends of the HCS 10 It can be installed only in the unit assembly 40 (that is, the section in which the parental moment acts).

The on-site topping concrete part 50 is made of on-site topping concrete poured on the HCS 10 and the RC rib 55, and reinforcement (not shown in the drawing) buried in the on-site topping concrete. The site topping concrete may be poured at the same time as the concrete constituting the RC rib (55).

The site topping concrete part 50 may be formed to a thickness of approximately 100mm to 200mm, but is not limited thereto.

[Second Example]

10 is a cross-sectional view showing an installation structure of a hollow core slab (HCS) according to a second embodiment of the present invention, and a reinforcing bar assembly (PC plate and first and second shear reinforcement bars, etc.) between HCS (PC slabs) installed at predetermined intervals. Including) is installed and on-site topping concrete is poured to form a composite rib. And, Figure 11a is a cross-sectional view showing the reinforcement assembly, Figure 11b is a side view showing the reinforcement assembly. Meanwhile, in the present specification, the'composite rib' refers to a rib formed by cooperating with precast concrete, cast-in-place concrete, and reinforcing bar assembly.

Referring to the drawings, the installation structure 200 includes an HCS 10, a composite rib 155 formed between the HCS 10, and an on-site topping concrete part 50 formed on the HCS 10 and the composite rib 155. ). Among the above components, the HCS 10 and the on-site topping concrete portion 50 are the same as the HCS 10 and the on-site topping concrete portion 50 of the first embodiment, so description thereof will be omitted herein.

The composite rib 155 is made by pouring on-site topping concrete after the reinforcing bar assembly is installed between the HCS 10. During construction (before the curing of the site topping concrete is completed), the load acting on the composite rib 155 is transmitted to the PC slabs 10 on both sides, and the composite rib 155 has a number of unit assemblies arranged. It cannot resist the directional bending moment (the bending moment acting in the longitudinal direction of the PC slab). On the other hand, after completion of construction (after curing of the site topping concrete is completed), the composite rib 155 resists the bending moment and shear force in the main direction.

The reinforcing bar assembly may be formed integrally, but a plurality of unit assemblies 140 may be continuously arranged. The integrated reinforcing bar assembly has a length substantially the same as the HCS 10, and the assembled reinforcing bar assembly has a length shorter than the HCS 10, for example, when the HCS 10 has a length of 10 m, the unit assembly 140 is It has a length of approximately 600mm to 4000mm. The advantages and disadvantages of the integrated reinforcing bar assembly and the assembled reinforcing bar assembly have been described above, and thus description thereof will be omitted. In addition, the problem when the length of the unit assembly 140 is out of the above range is the same as described above.

The unit assembly 140 may include a support member 141 and a reinforcing bar unit installed on the support member 141. In addition, the reinforcing bar unit may have various configurations if it is installed between the HCS 10 on both sides to reinforce shearing force and the like. For example, the reinforcing bar unit may include first and second shear reinforcing bars 44 and 45, as shown in FIGS. 10 to 11B.

The support member 141 is installed between neighboring HCSs 10, and its lower surface is installed at substantially the same height as the lower surfaces of both HCSs 10. Therefore, after pouring and curing the on-site topping concrete, the support member 141 and the HCS 10 have the same amount of deflection, so that the lower smoothness can be secured.

The support member 141 may have the same width as the spacing between the adjacent HCS 10, for example, a width of 150mm to 1200mm. Preferably, the support member 141 is a plate made of precast concrete (hereinafter referred to as'PC plate').

Inside the support member 141, the lower end of the load-bearing reinforcing bar 142, the lower end of the first shear reinforcing bar 44, and the second shear reinforcing bar 45 may be buried.

와 같은 형상을 가질 수 있다. The load-bearing reinforcing bar 142 has its central portion forming a lower end and both ends forming an upper end, the lower end being embedded in the support member 141, and the upper end spanning the upper surfaces of both HCS 10. Preferably, the load-bearing reinforcement 142 is

It can have the same shape as.

More preferably, a straight reinforcing member 143 may be coupled to an upper end of the load-bearing reinforcing bar 142. The reinforcing member 143 is coupled to the upper end of the load-bearing reinforcing bar 142, and both ends thereof are installed so as to span the upper surfaces of both HCSs 10. Reinforcing bars, steel bars, angle bars, angles, steel plates, etc. may be used as the reinforcing material 143. The load-bearing reinforcing bar 142 and the reinforcing material 143 are installed at predetermined intervals to support the load of on-site concrete and the first and second shear reinforcing bars 44 and 45, and preferably, the first shear reinforcing bar. Separate from the spacing of (44), it is installed at intervals of about 300mm ~ 1800mm.

The first shear reinforcement bar 44 is installed in the space 30 to increase shear resistance in the vertical and horizontal directions, fix the position of the second shear reinforcement bar 45, and prevent cracks from occurring at the connection portion of the HCS 10. prevent. The first shear reinforcement 44 is installed in the width direction of the HCS 10, and is installed at predetermined intervals along the length direction of the HCS 10. Preferably, in the unit assembly 140 installed at both ends in the longitudinal direction of the HCS 10, the first shear reinforcing bar 44 is relatively densely installed, and the unit assembly 140 is installed at the central portion in the longitudinal direction of the HCS 10. ), the first shear reinforcement 44 is installed at relatively wide intervals.

In the same way, if the reinforcing bar assembly is integral, the first shear reinforcing bar 44 is relatively densely installed at both ends in the longitudinal direction of the HCS 10, and the first shear reinforcing bar 44 is installed at the center portion in the longitudinal direction of the HCS 10. They are installed at relatively wide intervals.

와 같은 형상을 갖는 스터럽 철근일 수 있다. The first shear reinforcing bar 44 is installed so that its central portion forms a lower end and both ends form an upper end, and the lower end is embedded in the support member 141 and the upper end extends upward than the space 30. Preferably, the first shear reinforcing bar 44 is

It may be a stirrup reinforcing bar having the same shape as.

On the other hand, the first shear reinforcing bar 44 may be formed in various shapes, for example, may have a shape as shown in FIGS. 8A to 8C.

On the other hand, the second shear reinforcement 45 is installed to extend along the longitudinal direction of the HCS (10). Accordingly, the second shear reinforcing bar 45 is installed in a direction perpendicular to the first shear reinforcing bar 44.

The second shear reinforcing bar 45 includes a reinforcing bar coupled to the lower end of the first shear reinforcing bar 44 and a reinforcing bar coupled to an upper portion of the first shear reinforcing bar 44. Among the reinforcing bars, the reinforcing bar coupled to the lower end of the first shear reinforcing bar 44 is buried in the support member 141.

On the other hand, although the straight reinforcing bar is shown as the second shear reinforcing bar 45 in the drawing, the lattice reinforcing bar may be used as the second shear reinforcing bar 45.

The second shear reinforcing bar 45 has the same length as the support member 141. That is, the second shear reinforcing bar 45 extends from one end of the support member 141 to the other end. And, when the reinforcing bar assembly is an integral type, the second shear reinforcing bar 45 is installed over the entire length (L) of the HCS 10 or from both ends of the HCS 10 in a section of L/6 to L/3 (ie , It may be installed only in the section in which the parental moment acts). On the other hand, when the reinforcing bar assembly is an assembled type, the second shear reinforcing bar 45 is installed in all unit assemblies 140 or in a section of L/6 to L/3 from both ends of the HCS 10 (that is, a parental moment acts. It may be installed only in the unit assembly 140 installed in the section).

[Slab construction method]

Then, the construction method of the slab installation structure 100 according to the present invention will be described.

First, as shown in FIG. 12A, several HCSs 10 are installed so as to be spaced apart at predetermined intervals in the width direction. At this time, the spacer 210 is inserted between the upper ends of the HCS 10 to make the space constant. The spacer 210 has a jaw 212 that fits with the upper end of the HCS 10, and the jaw 212 is fitted with the upper end of the HCS 10 so that the distance can be uniformly adjusted.

Next, as shown in FIG. 12B, the support member 41 is installed between the HCS 10 by a fitting method. At both ends of the support member 41, locking portions 41a are formed, and the locking portions 41a are installed so as to span the lateral stepped jaws 16 of the HCS 10 on both sides. Since the support member 41 has a length of approximately 600mm to 4000mm, it is easy to fit.

Next, as shown in FIG. 12C, the first and second shear reinforcement bars 44 and 45 are installed on the support member 41. In the case of an assembled reinforcing bar assembly, the second shear reinforcing bar 45 is installed to extend from one end of the support member 41 to the other. In the case of an integrated reinforcing bar assembly, the second shear reinforcing bar 45 is the entire HCS 10. It can be installed to extend over its length. As an alternative to this, in the case of an assembly-type reinforcing bar assembly, the second shear reinforcing bar 45 is a supporting member ( 41) may be installed only, and in the case of an integral reinforcing bar assembly, the second shear reinforcing bar 45 is a supporting member of the section of L/6 to L/3 (ie, the section in which the parental moment acts) from both ends of the HCS 10. May be installed only on (41).

When the installation of the reinforcing bar assembly is completed, on-site topping concrete is poured on the HCS (10) and the support member (41) to form the RC rib (55) and the on-site topping concrete part (50). At this time, since the side surface of the HCS 10 and the support member 41 serve as a formwork, there is no need to install a separate formwork to form the RC rib 55.

1: hollow core slab 2: hollow
3: protrusions 4: space between hollow slabs
5: shear reinforcement 10: PC slab (HCS)
11: body 12: hollow
13: upper surface 14: center surface
15: lower side 16: side step sill
17a: lower reinforcing bar 17b: upper reinforcing bar
30: Space surrounded by PC slab and support member
40: unit assembly
41: support member 41a: locking portion
44: first shear reinforcing bar 45: second shear reinforcing bar
45a, 45b: horizontal reinforcing bar 45c: connecting reinforcing bar
46: lower reinforcing bar 47: straight reinforcing bar
48: support bar 50: site topping concrete part
55: RC rib 140: unit assembly
142: load-bearing reinforcement 143: straight reinforcement
155: RC rib
100, 200: PC slab installation structure
210: spacer 212: jaw

Claims (13)

delete delete delete A plurality of PC slabs 10 installed to be spaced apart at predetermined intervals in the width direction;
RC ribs 55 or composite ribs 155 formed between the PC slabs 10; And,
Including; on-site topping concrete part 50 formed on the ribs 55 and 155 and the PC slab 10,
The ribs 55 and 155 are formed by pouring on-site topping concrete after a reinforcing bar assembly is installed between both PC slabs 10, and the reinforcing bar assembly includes a plurality of unit assemblies 40 and 140 on both sides of the PC slab 10. ) Are arranged continuously between,
The PC slab 10 is formed with a camber in which the central portion in the longitudinal direction is convex due to the prestress acting in the longitudinal direction,
The unit assembly 40, 140,
Support members 41, 141, which are installed only between the PC slabs 10 and form a space 30 in which field topping concrete is poured together with both PC slabs 10; And,
Includes; a reinforcing bar unit installed in the space 30 to reinforce shear force,
The reinforcing bar unit includes a first shear reinforcing bar 44 and a second shear reinforcing bar 45,
The first shear reinforcement 44 is installed in the width direction of the PC slab 10 at predetermined intervals along the longitudinal direction of the PC slab 10, and the second shear reinforcement 45 is perpendicular to the first shear reinforcement 44 It is installed between both PC slabs (10) in the direction that is
The first shear reinforcing bar 44 is relatively densely installed in the unit assemblies 40 and 140 installed at both ends of the PC slab 10 in the longitudinal direction, and a unit assembly installed at the center of the PC slab 10 in the longitudinal direction In (40) (140), the first shear reinforcement (44) is installed at relatively wide intervals,
During construction, the load acting on the ribs 55 and 155 is transmitted to the PC slabs 10 on both sides, and the ribs 55 and 155 cannot resist the bending moment in the circumferential direction during construction. 55) (155), characterized in that to resist the bending moment and shear force in the circumferential direction, the installation structure of the slab. delete The method of claim 4,
The lower surfaces of the support members 41 and 141 are installed at substantially the same height as the lower surfaces of the PC slabs 10 on both sides, and the support members 41 and 141 have a width of 150 mm to 1200 mm,
The support member 41, 141 and the second shear reinforcing bar 45 have the same length, but characterized in that they have a length of 600mm to 4000mm, the installation structure of the slab. The method according to claim 4 or 6,
The first shear reinforcement muscle 44 has a central portion forming a lower end and both ends forming an upper end, the lower end is located in the lower portion of the space 30 or is located inside the support member 41, 141, and the upper end is both PCs The slab installation structure, characterized in that it spans the upper surface of the slab 10 or extends upwards than the space 30. The method of claim 7,
The second shear reinforcing bar 45 is a lattice reinforcement extending along the longitudinal direction of the PC slab 10, and the lower end of the lattice reinforcing bar is located inside the support members 41 and 141, and the upper end of the lattice reinforcing bar is space 30. The installation structure of the slab, characterized in that it extends upwards. The method of claim 7,
The rib is an RC rib 55,
The support member 41 is made of any one of a deck plate, FRP, plastic, cement board, metal plate, galvanized steel plate, and wood, but the support member 41 has a sealed lower surface and both sides and an open upper surface,
The slab installation structure, characterized in that the lower end of the first shear reinforcing bar 44 extends into the support member 41 through the open upper surface. delete delete The method of claim 7,
The rib is a composite rib 155,
The support member 141 is a PC plate made of precast concrete, characterized in that the lower end of the first shear reinforcement 44 is buried in the inside of the PC plate, the installation structure of the slab. delete

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