KR102415621B1 - PSC ventilation slab reinforced by changing thickness by location and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a PSC air duct slab reinforced by varying thickness at each location, and a manufacturing method thereof. The prestressed air duct slab comprises: a slab main body provided so that a plurality of unit sections are symmetrical from the center toward both end parts, and configured such that a sectional width of the lower surface of the unit section gradually increases from a center part to the both end parts; and a plurality of PS steel members embedded at regular intervals along the longitudinal direction of the slab main body in order to introduce tension to the slab main body. An objective of the present invention is to provide the PSC air duct slab which can reduce a construction cost and not impair safety, and the manufacturing method thereof.

Description

PSC ventilation slab reinforced by changing thickness by location and manufacturing method thereof

The present invention relates to a PSC (prestressed concrete) wind tunnel slab, which is a component for building a cross-flow wind passage for ventilation inside a long tunnel or a long underground passage, and a method for manufacturing the same.

Recently, as the construction of long underpasses and tunnels has increased, the (semi)cross flow ventilation system in which wind slabs are applied is increasing in the ventilation system from the conventional jet fan.

However, considering the fact that it is an urban area with severe traffic congestion, it is a situation that not only causes many casualties in case of fire, but also costs a lot of money and time due to damage to structures. However, through the experience of fires in European and domestic tunnels and underground structures, we know that not only human casualties but also enormous costs and time are required due to damage to structures.

Recently, with an intelligent ventilation system, when a fire occurs in long tunnels and underpasses, only the exhaust devices around the fire source are operated and the rest of the exhaust devices are closed, thereby preventing the spread of smoke from the fire and minimizing human casualties by quickly removing smoke. It is constructed as a fireproof windpipe slab that can avoid structural collapse by attaching a fireproof material to the bottom of the windpipe slab. There is a lot of interest in the prevention and reduction of disasters caused by fires in tunnels and underground driveways, which aims to improve safety by protecting structures from fire as well as improving workability and economic feasibility as a precast method using the RC slab as a precast method.

Accordingly, there are increasing cases of improving safety by protecting structures from fire by constructing ventilation facilities in tunnels and underpasses using precast PSC slabs having fire resistance performance.

However, recently, the construction cost of wind tunnel slabs with fire resistance against RABT or RWS fire curves in Europe is high, and there are cases where construction costs were reduced by constructing PSC wind tunnel slabs in which PP fibers were mixed with concrete in some long tunnels and underpasses. Also, there is a PSC wind slab installed with a fireproof material attached to the bottom to have fireproof performance. There is a problem to do.

On the other hand, in the case of the conventional PSC wind slab, since it is generally manufactured in a flat straight structure, tensile stress is generated at the upper edge of the concrete slab in a certain section of both ends due to the same straight arrangement of the strands that cannot cope with the bending moment at each location generated by external loads. , to solve this problem, non-attached sections were installed on the strands at both ends to prevent tensile stress from occurring at the upper edge of the end.

However, in such a conventional PSC wind slab, taping and installing PE pipes are added to the cladding of the stranded wire for non-attachment, which not only increases the working time and construction cost, but also increases the cost due to moisture penetration due to steam curing, etc. Along with corrosion of the attached strand, there is a problem that may cause durability problems due to the expansion of corrosion of the strand embedded in concrete in the long term.

Republic of Korea Patent No. 10-1633229 (2016.06.23.)

Therefore, the present invention was invented to solve the above problems, and by changing the thickness of the refractory material to be attached for fire resistance performance, the amount of expensive refractory material used is reduced and the sufficient fire resistance coating thickness is secured, thereby reducing the construction cost and ensuring safety. An object of the present invention is to provide a PSC wind slab that can not be inhibited and a method for manufacturing the same.

In addition, it responds to changes in bending moment due to external force through appropriate positional changes and cross-sectional changes of the strands arranged in a straight line inside the slab, while making no non-attached sections for the strands to exist, so additional processes or durability problems due to non-attached sections, etc. Another object of the present invention is to provide a PSC wind slab that can solve the problem and a method for manufacturing the same.

As a means for solving the above problems, the PSC wind speed slab reinforced by varying the thickness for each location of the present invention (hereinafter referred to as "the wind speed slab of the present invention") is, in the prestressed wind speed slab, from the center toward both ends, respectively. a slab body provided so that a plurality of unit sections are symmetrical, and the cross-sectional width of the lower surface of the unit section increases step by step from the center to both ends; and a plurality of PS steel materials embedded at regular intervals along the longitudinal direction of the slab body to introduce tension to the slab body.

As an example, the refractory material synthesized so that the lower surface is parallel to the space formed by each unit section of the slab body; it is characterized in that it further includes.

As an example, the slab body is characterized in that the steel fiber is mixed into the concrete.

As an example, the slab body is characterized in that a cutout is formed in which the corners of one end and the other end that are symmetrical in a diagonal direction on a plane are cut out, respectively.

As an example, the cut-out portion of the cutout has a triangle with the base width of the support portion of the slab body as the base, and the height of the cross-section deducted from the triangle is up to 1/3 of the overall cross-sectional width of the end of the slab body to be.

On the other hand, in the method of manufacturing a PSC wind slab reinforced by changing the thickness for each location of the present invention, a plurality of unit sections are preset so that each of the plurality of unit sections are symmetrical from the center to both ends, and the cross-sectional width increases from the unit section of the center to the unit section of both ends. Step-lowly placing a large refractory material on the bottom surface of the reaction arm; assembling a slab formwork to accommodate a fire resistant material in the reaction arm; disposing a plurality of PS steel materials at regular intervals along the longitudinal direction of the slab formwork; After fixing one end of the PC steel, introducing a tension force to the PC steel; pouring concrete into the slab formwork and performing curing; After the curing of the concrete is completed, releasing the tensile force applied to the PC steel to introduce a prestress to the slab; and separating the slab formwork, cutting the exposed PC steel, and finishing both ends of the slab.

In addition, the manufacturing method of the PSC wind slab reinforced by varying the thickness for each location of the present invention is preset so that a plurality of unit sections are symmetrical from the center toward both ends, and the cross-sectional width increases from the unit section of the center to the unit section of both ends. Step by step fixing the large support member on the bottom surface of the reaction arm; assembling the slab formwork so that the support member is accommodated in the reaction arm; disposing a plurality of PS steel materials at regular intervals along the longitudinal direction of the slab formwork; After fixing one end of the PC steel, introducing a tension force to the PC steel; pouring concrete into the slab formwork and performing curing; After the curing of the concrete is completed, releasing the tensile force applied to the PC steel to introduce a prestress to the slab; Separation of the slab formwork, cutting the exposed PC steel, and peeling the slab from the supporting member fixed to the reaction arm; and finishing both ends of the slab from which the supporting member is peeled off.

As an example, the support member is characterized in that it is made of an elastic material.

As an example, it is characterized in that steel fibers are mixed into the concrete poured into the slab formwork.

As described above, according to the PSC wind slab of the present invention and its manufacturing method, by changing the thickness of the refractory material attached for fire-resistance performance, the amount of expensive refractory material used is reduced, and the cross section of the slab is changed in response to the thickness of the refractory material to provide sufficient fire-resistance coating Since the thickness can be secured, the weight reduction due to the optimization of the windpipe slab cross section, as well as the reduction of material costs due to the rational use of expensive fireproof materials, the effect of reducing the cost of manufacturing the slab and the overall construction cost of the windpipe there is

In addition, while preventing the occurrence of non-attached sections for PS steel, it has a structure that responds to changes in bending moment due to external force through appropriate position changes of PS steels arranged in a straight line inside the slab body and changes in the cross-section of the slab body. The construction process of the attachment section is unnecessary, and accordingly, it is possible to reduce the production time and reduce the production cost. have.

In addition, due to the nature of the wind-bearing slab, which is a non-bearing structure that does not have additional loads such as live loads, reinforcement reinforcement and temperature reinforcement are excluded, and steel fibers effective for tensile and shear toughness are mixed into concrete to be manufactured. There is an effect that it is not necessary to improve the workability and speed.

In addition, by providing triangular cutouts that are symmetrical in the diagonal direction at both ends of the windpipe slab so that the maximum rotation distance of the windpipe slab can be reduced, additional margins can be secured from the sidewall of the tunnel or underpass during the on-site rotation of the windpipe slab. Accordingly, there is an effect that the rotational construction in a narrow space can be made easier in a narrow space while considering the safety of the workers and the prevention of damage to the members during the rotational construction of the wind slab.

1 is a front view showing a wind slab according to an embodiment of the present invention.
2 is a side cross-sectional view showing the coating thickness and eccentricity of PS steel for each unit section of the wind slab according to an embodiment of the present invention.
3 is a view showing the stress acting on the end side of a general flat straight PSC slab.
4 is a view showing a method of manufacturing a wind slab according to an embodiment of the present invention.
Figure 5 is a front view showing a fire-resistant wind slab according to an embodiment of the present invention.
6 is a side cross-sectional view showing the coating thickness of PS steel for each unit section of the fireproof wind slab according to an embodiment of the present invention.
7 is a view showing a method of manufacturing a fire-resistant wind slab according to an embodiment of the present invention.
8 is a side cross-sectional view showing a mixed state of steel fibers according to an embodiment of the present invention.
9 is a front view and a plan view showing a cutout of the wind slab according to an embodiment of the present invention.
10 is a front view and a plan view showing the rotational hypothesis process of the wind slab according to an embodiment of the present invention.

In describing the present invention, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to best describe his invention. It must be interpreted as a meaning and concept that is consistent with the technical idea of

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

Referring to Figure 1, the wind slab (2) of the present invention is a PSC (prestressed concrete) slab in which a plurality of PS steel materials 20 are embedded and prestress is introduced, side by side in the upper space of a previously constructed tunnel or underpass By being installed, the wind map (1) is constructed.

As a method of applying a prestress to the wind slab 2, any suitable one of pre-tension or post-tension may be applied according to the manufacturing method of the slab.

And the PS steel material 20 referred to in the present invention may be any one of a steel wire, a strand wire, and a steel bar commonly used to impart a prestress.

The wind slab (2) includes a slab body (10) and a PS steel material (20) embedded at regular intervals along the longitudinal direction of the slab body (10) to introduce tension to the slab body (10) can be configured.

The slab body 10 is configured such that the lower section of the slab body 10 is changed in a stepwise manner so that the lower eccentricity of the PS steel material 20 arranged in a straight line inside the slab body 10 is changed.

The slab body 10 is provided so that a plurality of unit sections are symmetrical from the center toward both ends, respectively, and the cross-sectional width of the lower surface of the unit section increases step by step from the center to both ends.

As an example, the slab body 10 may be divided into a second section (b) and a third section (c) so as to be symmetrical toward both ends with respect to the first section (a) of the center as shown in FIG. At this time, the cross-sectional width h2 of the lower surface of the second section (b) is relatively larger than the cross-sectional width h3 of the lower surface of the first section (a), and the cross-sectional width h2 of the lower surface of the second section (b) The cross-sectional width h3 of the lower surface of the third section (c) is larger than that of the third section (c).

Here, although the unit section is illustrated as being set to three sections in the present embodiment, the present invention is not limited thereto, and it is natural that more sections can be partitioned and set.

Referring to FIG. 3, in general, in the case of a straight PSC slab having the same cross-sectional width of the lower surface, the concrete slab is staged in a certain section at both ends due to the same straight arrangement of the strands that do not respond to the bending moment at each location caused by an external load. Tensile stress is generated in the pole, and one or more non-attached sections for the strand are provided at both ends to counteract this to prevent tensile stress from occurring at the upper edge of the end.

However, in order to form a non-attached section, an additional process of taping and covering the PE pipe is required for the stranded wire, so the manufacturing time of the PSC slab becomes longer, and the construction cost accordingly increases, and in particular, the steam curing process of the slab As a result, moisture penetrates and causes corrosion in the stranded wire in the non-attached section, which in turn may act as a factor to reduce the durability of the slab.

Accordingly, the wind slab 2 of the present invention excludes non-attachment to the PS steel material 20, and as described above, an appropriate position change of the PS steel material 20 disposed in a straight line inside the slab body 10 and the slab body ( It is designed to respond to the change in bending moment due to external force through the cross-sectional change in 10).

That is, as shown in FIG. 2 , the eccentricity of the cross section with respect to the PS steel material 20 arranged in a straight line inside the slab body 10 is increased to match the section where non-attachment is required, and the tensile stress at the upper edge of the cross section is increased as shown in FIG. By making it fall within the allowable range, all PS steel materials 20 are attached to the entire section of the slab body 10, so that additional processes and durability problems caused by non-attached sections can be solved as in the prior art.

In the case of the wind-do slab 2 constituting the wind-do 1 as in the present invention, the number of PS steel materials 20 and the height of the cross-section are determined based on the central portion (the first section) where the bending moment due to external force is the largest. Then, even if the height of the lower covering on the side section of the slab body 10 is increased by about 1/10 of the total height, the eccentricity due to the prestress acting on the PS steel material 20 is reduced, so that the generation of tensile stress on the upper surface of the member can be reduced. there will be

Hereinafter, with reference to FIG. 4, a method of manufacturing the wind chimney slab 2 having the side cross-section as described above will be described.

As mentioned above, the wind slab 2 may be manufactured by any one of a pre-tensioning method or a post-tensioning method. will be described as an example.

Prior to the manufacture of the wind speed slab 2, the reaction arm 3 for factory production of the wind speed slab 2 and the slab formwork 5 corresponding to the external shape of the wind speed slab 2 are prepared in advance.

With respect to the wind slab 2 to be manufactured first, a plurality of unit sections are preset so that each of the plurality of unit sections are symmetrical from the center to both ends, and the supporting member 4 whose cross-sectional width is gradually larger from the unit section of the center to the unit section of both ends is described above. It is fixedly installed on the bottom surface of the reaction arm (3).

And the slab formwork 5, which is designed in advance so that the support member 4 is accommodated in the reaction arm 3, is assembled. At this time, the slab formwork 5 may be provided with one or more injection holes (not shown) for injection of concrete, or the entire or partial section of the upper surface may be opened.

Thereafter, a plurality of PS steel materials 20 are arranged at regular intervals along the longitudinal direction of the slab formwork 5 . At this time, it is natural that the type, number, and spacing of the PS steel materials 20 can be determined according to the design criteria predicted in advance for the wind speed (2).

And after fixing one end of the PC steel material 20, the step of introducing a tension force to the PC steel material (20) is performed.

As an example, the PC steel 20 may have one end fixed by an anchor installed on the reaction arm 3 , and the other end may be bound to the hydraulic cylinder 6 using a pressure plate fixed to the hydraulic cylinder 6 . Tension can be introduced by tensioning.

Thereafter, concrete is poured inside the slab formwork (5), and the slab is completed by natural curing or steam curing. At this time, it is preferable that steel fibers are mixed into the concrete to be poured inside the slab formwork (5).

That is, the PSC slab for constructing the wind tunnel (1) in a tunnel or underpass, etc. is a non-bearing structure without additional loads such as live loads after installation. By mixing steel fibers that can increase toughness to concrete and manufacturing them, processes such as rebar processing and reinforcement are eliminated, and workability and speed can be improved.

And when the curing of the concrete is completed, the hydraulic pressure of the hydraulic cylinder 6 is gradually removed to release the tensile force applied to the PC steel 20, and the prestress is introduced into the slab, that is, the concrete.

Finally, the slab formwork (5) is separated, and the slab is peeled from the supporting member (4) fixedly installed on the reaction arm (3) in a state in which the exposed PC steel material (20) is cut, and then the supporting member (4) is By moving the exfoliated slab to a yard, etc. and closing both ends of the slab, it is possible to complete the production of the wind slab 2 having a larger cross-section step by step from the center to both ends.

In the manufacturing method according to the present embodiment, the support member 4 is preferably made of an elastic material, such as rubber, capable of providing an elastic force.

This is because the slab on the reaction arm 3 is slightly deformed and displaced during the release process of introducing the prestress into the concrete by the elastic action of the supporting member 4, which is an elastic body. in order to be able to prevent

On the other hand, in the wind tunnel slab 2 of the present invention, a fireproof material 30 is attached to the bottom surface in contact with the space part of the tunnel or underpass in consideration of the occurrence of fire, and accordingly, the wind speed slab 2 can have a fire resistance performance.

Considering that, in general, when a fire occurs in a tunnel or underpass, the temperature at the ceiling is the highest and reaches the highest point first. A large impact can be expected.

Accordingly, the wind slab 2 of the present invention does not attach a fireproof material of the same thickness to the bottom of the slab body 10 based on the structural feature that the width of the cross-section increases step by step from the center to both ends, rather than as shown in FIG. As shown, the fire resistant material 30 is attached and synthesized so that the lower surface is parallel to each space formed by each unit section of the slab body 10 .

That is, the covering thickness t1 of the fire resistant material 30 for the first section (a) of the central part of the slab body 10 is formed to be the thickest, and the covering thickness of the large fire 30 for the third section (b), which is both ends, (t3) is formed the thinnest, and is attached and synthesized for each unit section while changing the thickness of the fire resistant material 30 in inverse proportion to the width of the side cross-section in the entire section of the slab body 10 .

6, at the end of the slab body 10, a refractory material 30 having a thickness that is thin enough to control the surface temperature of concrete to a minimum is used, while the cross-sectional width of the concrete is increased, so that it is possible to secure a sufficient coating thickness. , Conversely, in the central part, instead of having a small cross-sectional width of concrete, it is possible to secure a sufficient coating thickness by reinforcing it by attaching a fireproofing material 30 having a relatively large thickness, thereby controlling the reference temperature of the reinforcing bar or PS steel material 20. it will be possible

As such, the wind slab 2 of the present invention changes the thickness of the concrete of the slab body 10 by location and changes the thickness of the refractory material accordingly to ensure a uniform coating thickness and fire resistance performance over the entire section, Since it is possible to secure sufficient fire resistance performance without unnecessary use of the expensive fire resistant material 30, it is possible to reduce overall material and construction costs.

The method of manufacturing the wind guide slab 2 of this embodiment, that is, the wind guide slab 2 to which the fire resistance material 30 is attached as it has fire resistance performance, is compared with the manufacturing method of the wind guide slab 2 having a side cross-section as described above. There are some differences only in the use or absence of members, but most of the processes are shared the same.

Hereinafter, with reference to FIG. 7, the manufacturing method of the fire-resistant wind speed slab 2 according to this embodiment will be described.

With respect to the wind slab 2 to be manufactured first, a plurality of unit sections are preset so that each of the plurality of unit sections are symmetrical from the center to both ends, and the refractory material 30 with a larger cross-sectional width step by step from the unit section in the center to the unit section at both ends is applied to the reaction force. It is placed on the bottom surface of the stand (3).

And after assembling the slab formwork 5, which is pre-designed to accommodate the fireproof material 30 in the reaction arm 3, a plurality of PS steel materials 20 at regular intervals along the longitudinal direction of the slab formwork 5. place it

And after fixing one end of the PC steel material 20, a step of introducing a tension force to the PC steel material 20 is performed, concrete is poured inside the slab formwork 5, and natural curing or steam curing is performed. Thus, the slab in which the refractory material 30 is synthesized on the bottom surface is completed. At this time, it is preferable that steel fibers are mixed into the concrete to be poured into the slab formwork (5).

And when the curing of the concrete is completed, the prestress is introduced into the slab, that is, the concrete by gradually releasing the tensile force applied to the PC steel material 20 .

Finally, the slab formwork (5) is separated, the slab is moved to a yard, etc. in a state in which the PC steel material (20) exposed from the slab is cut, and both ends of the slab are closed by the wind tunnel slab (2) having fire resistance performance. Crafting can be completed.

Meanwhile, in the slab body 10 according to an embodiment of the present invention, as shown in FIG. 8 , the steel fiber 100 may be mixed into the concrete.

As mentioned above, the PSC slab prepared for the construction of the wind tunnel 1 has a characteristic of having a non-bearing structure in which a direct load such as a live load is not applied after construction. Therefore, unlike the general PSC slab, the wind slab (2) of the present invention is able to increase the toughness of concrete against material shrinkage by mixing steel fibers in concrete without reinforcement or temperature reinforcing bars, and, accordingly, rebar processing or Since processes such as reinforcement are unnecessary, the workability of the slab can be improved.

In addition to this, the slab body 10 according to an embodiment of the present invention is provided with a cutout 110 in which the corners of one end and the other end symmetrical in a diagonal direction in a plane are respectively cut at both ends. In the process of rotating construction, it is possible to minimize safety accidents as well as work convenience.

In general, in the area where the wind road 1 is to be constructed, as shown in FIG. 10 , an anchoring bracket 1-1 is installed on both sides along the longitudinal direction of a tunnel or an underpass, respectively, and the anchoring bracket 1-1 Both ends of the wind slab (2) are placed on the

In this construction process, each wind slab 2 transported to the site is rotated in an oblique direction so as to avoid the anchor bracket 1-1, and is positioned higher than the anchor bracket 1-1 through the lifting equipment. After raising it to the furnace, it returns to its original direction and lowers the wind guide slab 2 so that both ends of the wind guide slab 2 are placed in the anchoring brackets 1-1, respectively. In this process, the wind speed slab 2 Because the wire is connected and the wire is pulled or released by manpower to adjust the rotation direction and position, not only safety accidents for workers during the construction process but also the risk of accidents due to collision between the side wall of a tunnel or underpass and the windpipe slab (2) This is quite high.

Accordingly, in the present invention, the maximum rotation distance (diagonal length of the member) of the wind speed slab 2 is reduced as much as possible in implementing the rotation hypothesis of the wind speed slab 2, so that the rotation radius of the wind speed slab 2 can be optimized. At both ends of (2), the cutouts 110 that are symmetrical to each other in the diagonal direction are formed.

That is, in consideration of the maximum rotational distance (diagonal length of the member) of the windpipe slab 2, cutouts 110 are formed at both ends of the windpipe slab 2, respectively, and in the process of rotating the windpipe slab 2, a tunnel or an underpass By securing an additional margin value from the side wall of the

Here, the cut-out portion of the cut-out 110 has a height up to 1/3 point (1/3B) of the cross-sectional width B of the end so that there is no abrupt cross-sectional change or ease of manufacture as shown in FIG. Preferably, it is configured to have a triangular shape with the base width of the support portion of the slab body 10 on the plane.

This is in consideration of the risk of overturning after construction, and since the position where the corners are cut diagonally faces, even after the construction is completed on the mounting bracket (1-1), overturning may occur when the operator moves, so the corners are cut in a limited way. .

Specifically, the cut-out portion of the cut-out 110 has a triangle with the base width of the support portion of the slab body 10 on a plane, and the height of the cross-section deducted from the triangle is the total cross-sectional width of the end of the slab body 10 (B) It is characterized in that it is up to the 1/3 point (1/3B) of the bar, and the cross-section deducted as much as a triangle is placed in the mounting bracket (1-1) and vertical shear (reaction force) ) is supported.

In addition, in the non-bearing structure, the wind slab (2), the ultimate shear strength due to external force in the critical section for shear does not exceed 20% of the nominal strength of the section, and in general members, the design shear strength is reduced by 50% to the minimum In the regulation for arranging shear reinforcing bars, it is stipulated that all shear strengths of the cross section are effective, with exceptions in the case of wide and low depth members such as wind slab (2). Based on this, as described above, while making the cutout 110 in a triangular shape, the height of the deducted cross-section is 1/3 of the cross-sectional width (B) of the end, and the width of the remaining cross-section exceeds 2/3 for safety consideration. However, it is possible to improve the workability during the construction of rotation for the wind slab (2) in a narrow space.

Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also provided. is within the scope of the

1 : Pungdo 2 : Pungdo slab
3: reaction arm 4: support member
5: slab formwork 10: slab body
20: PS steel 30: refractory material
100: steel fiber 110: cutout

Claims (9)

In the prestressed wind slab,
a slab body provided so that a plurality of unit sections are symmetrical from the center toward both ends, the slab body configured such that the cross-sectional width of the lower surface of the unit section increases step by step from the center to both ends; and
A plurality of PS steel materials are embedded at regular intervals along the longitudinal direction of the slab body in order to introduce tension to the slab body;
The slab body is configured with a cutout in which the corners of one end and the other end, which are symmetrical in a diagonal direction on a plane, are cut, respectively,
The incision portion of the incision is,
PSC wind map reinforced by varying the thickness for each location, characterized in that it has a triangle with the base width of the slab main body as its base and the height of the cross-section deducted from the triangle is up to 1/3 of the total cross-sectional width of the end of the slab body slab.
The method of claim 1,
PSC wind slab reinforced by varying the thickness for each location, characterized in that it further comprises;
The method of claim 1,
The slab body is
PSC wind slab reinforced by varying the thickness for each location, characterized in that steel fibers are mixed into concrete.
delete delete disposing on the bottom surface of the reaction arm, presetting a plurality of unit sections to be symmetrical, respectively, from the center toward both ends and having a larger cross-sectional width step by step from the unit section of the center to the unit section of both ends;
assembling a slab formwork to accommodate a fire resistant material in the reaction arm;
disposing a plurality of PS steel materials at regular intervals along the longitudinal direction of the slab formwork;
After fixing one end of the PC steel, introducing a tension force to the PC steel;
pouring concrete into the slab formwork and performing curing;
After the curing of the concrete is completed, releasing the tensile force applied to the PC steel to introduce a prestress to the slab; and
In the method of manufacturing a PSC wind slab comprising; separating the slab formwork, cutting the exposed PC steel material, and finishing both ends of the slab,
The PSC wind slab,
The slab body is provided so that a plurality of unit sections are symmetrical from the center toward both ends, and the cross-sectional width of the lower surface of the unit section increases step by step from the center to both ends, and the slab body to introduce tension to the slab body It includes a plurality of PS steel materials embedded at regular intervals along the longitudinal direction of
The slab body is configured with a cutout in which the corners of one end and the other end, which are symmetrical in a diagonal direction on a plane, are cut, respectively,
The incision portion of the incision is,
PSC wind map reinforced by varying the thickness for each location, characterized in that it has a triangle with the base width of the slab main body as its base and the height of the cross-section deducted from the triangle is up to 1/3 of the total cross-sectional width of the end of the slab body Slab manufacturing method.
A method comprising: presetting a plurality of unit sections to be symmetrical from the center toward both ends, and fixing and installing supporting members having a larger cross-sectional width step by step from the unit section of the center to the unit sections of both ends on the bottom surface of the reaction arm;
assembling the slab formwork so that the support member is accommodated in the reaction arm;
disposing a plurality of PS steel materials at regular intervals along the longitudinal direction of the slab formwork;
After fixing one end of the PC steel, introducing a tension force to the PC steel;
pouring concrete into the slab formwork and performing curing;
After the curing of the concrete is completed, releasing the tensile force applied to the PC steel to introduce a prestress to the slab;
Separation of the slab formwork, cutting the exposed PC steel, and peeling the slab from the supporting member fixed to the reaction arm; and
In the method of manufacturing a PSC wind slab comprising; finishing both ends of the slab from which the supporting member is peeled,
The PSC wind slab,
The slab body is provided so that a plurality of unit sections are symmetrical from the center toward both ends, and the cross-sectional width of the lower surface of the unit section increases step by step from the center to both ends, and the slab body to introduce tension to the slab body It includes a plurality of PS steel materials embedded at regular intervals along the longitudinal direction of
The slab body is configured with a cutout in which the corners of one end and the other end, which are symmetrical in a diagonal direction on a plane, are cut, respectively,
The incision portion of the incision is,
PSC wind map reinforced by varying thickness by location, characterized in that it has a triangle whose base is the width of the support part of the slab body on a plane, and the height of the cross-section subtracted from the triangle is up to 1/3 of the total cross-sectional width of the end of the slab body Slab manufacturing method.
8. The method of claim 7,
The support member is
A method of manufacturing a PSC wind slab reinforced by varying the thickness at each location, characterized in that it is composed of an elastic material.
8. The method of any one of claims 6 or 7,
A method of manufacturing a PSC wind slab reinforced by varying the thickness for each location, characterized in that steel fibers are mixed in the concrete poured inside the slab formwork.

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