KR100760232B1 - Precast stairs and the unit structure thereof, and constructing method for stairway using the same - Google Patents

Abstract

A precast stair, a unit structure thereof and a stair constructing method using the same are provided to increase durability and load carrying capacity of stairs and to reduce noise due to moving load by placing at least two reinforced bars in horizontal step parts. A unit structure of a precast stair comprises horizontal step parts(113) and vertical connecting parts(111). The horizontal step parts and vertical connecting parts are integrally formed in 1~4 groups. Each of the horizontal step parts and the vertical connecting parts is formed with an insertion projection(112) and an insertion groove at both ends. At least two reinforced bars(117) with bolt parts(118) are placed in the horizontal step parts.

Description

Precast Stairs and the Unit Structure Thereof, and Constructing Method for Stairway Using the Same}

1 and 2 are partially omitted exploded perspective views of the precast stairs according to one preferred embodiment of the present invention, respectively.

3A to 3D are perspective views of a nut mounting type stair unit structure according to one preferred embodiment of the present invention, respectively.

4A to 4D are perspective views of the bolt mounting step unit structure according to another preferred embodiment of the present invention, respectively.

5A and 5B show an example of a horizontal tread of the nut-mounted stair unit structure and the bolt-mounted stair unit structure, respectively, with a side view on the left and a plan view on the right.

6 is an exemplary diagram illustrating a state in which the stress dispersing connector and the stress dissipating connecting member are coupled to each other at the inner and outer sides of the side plate.

7 is a schematic diagram showing a method according to the present invention for mounting a precast stairwell and a mezzanine at the same time after mounting a precast staircase on a stairwell supported by a group according to a preferred embodiment of the present invention.

FIG. 8A is a schematic side view illustrating the method according to the invention for simultaneously constructing a chamfer, mesial and wall in the example of FIG. 7; FIG.

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

Figure 9 is an exemplary view showing a preferred example of stair step used in the construction method according to the present invention.

-Explanation of symbols for the main parts in the drawings-

1, 1a: precast stairs according to the invention

2: mesmerizing 3, 4: mesmerizing

10: staircase 11: tread

12: longitudinal connecting plate 15: reinforcing fiber

16: nut

110, 120, 130, 140: precast step unit structure according to the present invention

111: vertical connection 112: protrusion insert

113: horizontal step portion 114: long groove (insertion groove)

115: nut ball 116: anti-slip groove

117: reinforced bar 118: bolt portion

20: side plate 21: steel side plate

24: fastening hole 27: inclined portion

28: lower horizontal part 29: upper horizontal part

28a, 29a: reinforcing plate 28b: bolt

29b: nut ball 30: connection member

31: reinforcing member 32, 32a: reinforcing bar

40: connector for stress distribution 41: wing

42: body 43: extension

44: through hole 50: connection member for stress dispersion

51: nut 52: fastener

53: bolt 60: stairwell

61: reinforcing bar 62: reinforcing member

63: protrusion 64: root

65: oblique protrusion 70: rectangular formwork

70a: triangular formwork 80: wall

90: Dongbari

The present invention relates to a precast staircase and a unit structure thereof, and a construction method of the staircase using the same, and more particularly, a high strength to ultrahigh strength fiber in the range of 60 to 200 MPa having a relatively good ductile behavior, excellent watertightness and durability. The present invention relates to a reinforced cement composite precast staircase, a precast unit structure for assembling the same, and a method of constructing a precast staircase that can guarantee economical, efficient and excellent construction quality.

In general, vertical and vertical copper wire connections of buildings, especially high-rise buildings, are made by the installation of stairs with elevators. However, the stairs must be connected to the upper and lower slabs in a narrow staircase space, and the shape is also complicated by vertical slanted lines. Unlike general building members such as walls, construction conditions are relatively demanding and cumbersome.

In the case of residential or residential office complex apartments or low-rise or high-rise buildings for office or malls, the construction of reinforced concrete staircases is the most common construction method.

However, the construction of stairs with reinforced concrete nails is not only a demanding and air-consuming process for assembling formwork of inclined stair slabs, reinforcing bar reinforcement, and stepping formwork for stair stepping. In addition to the problems that construction is necessarily accompanied, there is a problem that the economic efficiency and efficiency is low because it is a labor-intensive and air-construction.

Therefore, in order to solve such a problem, Korean Patent No. 0487893 proposes a construction method of fixing a special type of dock and a middle dock to a wall, and then mounting a conventional precast reinforced concrete-like staircase and bonding it with mortar. Since cast reinforced concrete stairs have a common shape with continuous right triangles on the sides, they do not achieve volume and weight reduction compared to cast-in-place concrete stairs, so there are limitations of applicability as mobile-mounted precast stairs. Since it has a continuous length from the true or mid-chamfer to the floor, the overall volume was very large, there was a problem that the transport and construction is cumbersome and inconvenient. In addition, the construction method suggests the method of installing the precast middle dock and the landing after installing the staircase, fixing the mortar after the precast stairway, but at the same time slab and wall casting Since it is impossible to provide a work space and a moving line using a precast staircase during construction, there is still a lot of inconvenience in construction, so it is not applied smoothly in the field.

As a conventional method for solving the problems of the reinforced concrete stairs construction method, Korean Patent Laid-Open Publication No. 2002-0062245 proposes a prefabricated steel stairway connection structure and a construction method thereof, but the proposed structure and method are steel frame high-rise buildings. It is a method of connecting the steel staircase which is made by combining the unit of steel aggregate to the structure of the building. There is a problem in the early stage of manufacturing, such as the deformation of steel staircase due to heat, and the finished steel staircase has a problem of severe noise caused by load when passing stairs due to the property of metal material, and especially vulnerable to fire, and the thickness of plate Due to the thin thickness, the secondary moment of cross section decreases, which may cause sagging due to load. It has usability issues, such as the.

Therefore, as a way to solve some of the problems of the steel stair step, Korean Utility Model Registration No. 0343325 is a double stepping unit in order to reduce the noise and sag caused by the walking movement load, and also to manufacture and In order to improve the hypothesis and functionality, we propose an improved steel staircase that uses the bolt connection method of the stepping unit and the two side plates.However, the superiority of the superiority is satisfactory compared to the conventional reinforced concrete stairs in terms of the manufacturing cost of stairs. Not only that, but also the rising trend of the production cost of steel stair due to the recent rise in raw material prices is expected to continue for a long time.

As mentioned above, the construction of reinforced concrete stairs in reinforced concrete buildings is a labor intensive construction that requires a lot of precision and time, but until now, a reasonable technology with sufficient economic, efficiency, and quality characteristics to replace it is presented. It is not done.

Accordingly, the first object of the present invention is high strength to ultra high strength of 60 to 200 MPa, but also has excellent durability and load resistance due to relatively excellent ductility behavior compared to the existing high strength concrete, and excellent watertightness and excellent walking force. It is to provide a fiber reinforced cement composite precast staircase with noise reduction properties.

The second object of the present invention is that the installation can be installed only by simple mounting work without the formwork or moving the construction of the stairs itself on the site, excellent construction characteristics that can reduce the labor cost and construction time by shortening the construction period, and shorten the air To provide a fiber-reinforced cement composite precast staircase.

A third object of the present invention is to provide a prefabricated fiber reinforced cement composite precast system staircase.

It is a fourth object of the present invention to provide a prefabricated fiber reinforced cement composite precast system step which can reduce manufacturing and transportation costs.

A fifth object of the present invention is to provide a precast stair unit structure which is applied to the economical and efficient manufacture of the precast fiber reinforced cement composite staircase according to the first to fourth objects described above.

A sixth object of the present invention is to provide an economical and efficient method for constructing a fiber reinforced cement composite precast step according to the first to fourth objects described above.

According to a first preferred embodiment for smoothly achieving the first to fourth objects of the present invention described above, a stair unit formed by successively fastening a stair unit structure formed by 1 to 4 sets of stepping plates and a vertical connecting plate is formed. And two inclined side plates; In the above step unit structure, the blending ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.9 to 1.7: 0.1 to 0.3: 0.02 to 0.1: 0.01 to 0.06: 0.03 to 0.2: There is provided a precast staircase consisting of a high strength fiber reinforced cement composite composed of 0.2 to 0.45 and having a strength of 60 to 100 MPa after curing.

According to a second preferred embodiment for smoothly achieving the first to fourth objects of the present invention, at least one of the two side plates is a metal material, or at least one of the two side plates is cement, fine aggregate, The blending ratio of filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.8 to 1.5: 0.2 to 0.4: 0.05 to 0.3: 0.02 to 0.07: 0.05 to 0.4: 0.18 to 0.3 in weight ratio, and the strength after curing A precast staircase is provided which is an ultra high strength fiber reinforced cement composite having a 100 to 200 MPa.

According to a third preferred embodiment for smoothly achieving the first to fourth objects of the present invention, at least one reinforced bar for load bearing reinforcement is provided in the above step of the step unit structure. A precast staircase is provided which is embedded and wherein both ends of the reinforcement bar are physically supported by the side plates.

According to a fourth preferred embodiment for smoothly achieving the first to fourth objects of the present invention described above, in the first or second aspect described above, the reinforcing member connecting the lower and upper horizontal portions of both side plates and orthogonal thereto A precast staircase is further provided, further comprising a connecting member having a plurality of reinforcing bars connected to each other.

According to one preferred embodiment for smoothly achieving the fifth object of the present invention, the mixing ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.8 to 1.7: 0.1 to 0.4 in weight ratio. : 0.02 to 0.3: 0.01 to 0.07: 0.03 to 0.4: 0.18 to 0.45, the strength after curing is 60 to 200 MPa, and one to four sets of horizontal stepping portions and the vertical connecting plate are integrally formed. A protruding inserting unit is formed at one end of the stepping unit or the vertical fastening plate, and an insertion long groove is formed at the other end of the horizontal stepping unit or the vertical fastening plate, and a plurality of precast stair units are continuously fastened to form a staircase. A structure is provided.

According to a preferred aspect for smoothly achieving the sixth object of the present invention, a precast stair assembly step of fixing a plurality of precast stair unit structures of the above aspect to two inclined side plates while continuously fastening a plurality of precast stairs unit structures; After or at the same time as the precast stair assembly step, a connecting member fixing step of fixing the connecting member and the connecting member having a plurality of reinforcing bars orthogonal thereto to each of the upper and lower horizontal portions of the two inclined side plates; Mounting a stairwell on a support having a reinforcing bar and a frame on the bottom and midsole formations; A mounting step of placing the precast stairs on which the connection member is formed on the stairwell; A form assembly step of assembling the floor filling, the middle filling and the wall formwork, so that one of the two inclined side plates can function as a formwork at a position that can be fixed in the wall to be constructed; There is provided a method of constructing a precast stair consisting of placing concrete in the connection member to form a dock and a middle dock, and simultaneously placing concrete in a wall formwork to form a wall.

Hereinafter, with reference to the drawings will be described in more detail with respect to the present invention.

First, Figures 1 and 2 are partially exploded perspective views of the high-strength to ultra-high strength fiber reinforced cement composite precast stairs (1, 1a) according to a preferred embodiment of the present invention, respectively, since the basic configuration is substantially the same for convenience. Let's explain together.

Precast stairs (1, 1a) according to the present invention is a staircase (10) and two inclined side plates 20 positioned on both sides thereof, and optionally the upper and lower ends of each of the two inclined side plates (20) It consists of a connection member 30 for connecting with the reference numerals 3 and 4 in FIG. 7 or the middle (see reference 2 in FIG. 7), and is provided to the construction site in the form of precast to reduce the cost of construction of stairs In addition, labor costs can be reduced by simplifying complex stair construction procedures, and construction costs can be reduced by shortening construction periods. Side plates made of high-strength to ultra-high-strength cement composites (preferably ultra-high strengths of 100 to 200 MPa after curing) Cement composites) and stair treads (typically high strength cement composites with a strength of 60-100 MPa after curing) are implemented as system stairs, which can never be achieved with conventional concrete. Formwork for stair itself in the field of precast stairs made of weight, Shore can be installed through a simple operation that no construction.

According to the present invention, the steps 10 and side plates 20 (when the side plates are not composed of iron plates) generally have a mixing ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water. It is composed of 1: 0.9 to 1.7: 0.1 to 0.3: 0.02 to 0.1: 0.01 to 0.06: 0.03 to 0.2: 0.2 to 0.45 by weight, has a high strength of 60 to 100 MPa after curing, and has a porosity of 7% or less. Although it may be 3 to 7%, if necessary, the mixing ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.8 to 1.5: 0.2 to 0.4: 0.05 to 0.3 in weight ratio. : 0.02-0.07: 0.05-0.4: 0.18-0.3 It is ultra-high intensity | strength of 100-200 Mpa after hardening, porosity may be 5% or less, and it may have a porosity of 3 to 5% generally. Preferably, the step 10 is a high strength fiber reinforced cement composite having a strength of 60 to 100 MPa after curing, and the side plate 20 is an ultra high strength fiber reinforced cement composite having a strength of 100 to 200 MPa after curing. Can be.

Precast stairs (1, 1a) according to the present invention shows a ductile behavior that was not seen in conventional high-strength concrete due to the mixing of steel fibers, exhibits excellent water tightness due to low porosity, sufficient structural load capacity and durability due to high strength to ultra high strength In addition to having a low noise, the noise reduction effect of the walking movement load is excellent.

The fine aggregate in the above-mentioned compounding component is not limited, but aggregates having an average particle diameter of 0.7 mm or less, usually 0.1 to 0.7 mm of silica sand (SiO ₂ ) components of 90% or more, usually 90 to 99.9% It is preferable to use.

In addition, the filler in the above-mentioned compounding component is not limited, but the average particle diameter is 20 µm or less, usually 3 to 20 µm, and the silica sand (SiO ₂ ) component is 97% or more, usually 97 to 99.9%. It is preferable to use what is.

The finely divided ceramics in the above-mentioned compounding components include, but are not limited to, silica fume, blast furnace slag, fly ash, limestone fine powder, or any mixture thereof. It may be desirable.

In addition, the water reducing agent in the above-mentioned compounding components may be those known or sold in the art as an 'ultra high performance water reducing agent', and in the case of a high strength fiber-reinforced cement composite having a strength of 60 to 100 MPa after curing, the water cement ratio is 20 Cement composites (% to 45%) should be able to impart sufficient fluidity, while ultra-high strength fiber-reinforced cement composites with strengths of 100 to 200 MPa after curing have a water cement ratio of 18% to 30%. It should be possible to impart the properties that the cement composite can have sufficient fluidity. Preferred examples of such a water reducing agent include a polycarboxylic acid-based water reducing agent, specifically, a specific gravity of about 1.1 to 0.1 having a polycarboxylic acid acrylic ester as a main component and a solid content of about 40%. Such ultra-high performance sensitizers are commercially available in various types of companies and known to those skilled in the art will be omitted further description thereof.

In addition, although the steel fiber in the said mixing | blending structural component is not restrict | limited, Average length is 30 mm or less, Usually 0.3-30 mm, Average diameter is 0.5 mm or less, Usually 0.1-0.5 mm, The shape A coefficient of about 60 to 70, preferably about 65 is used, and there is no particular limitation as long as it is a metal wire having strong toughness, but in general, steel wire may be preferably used. The incorporation of such steel fibers will mitigate the brittle behavior inherent in high strength concrete and impart ductile behavior.

The staircase 10 and the side plate 20 (when the side plate is not composed of an iron plate) are thoroughly stirred by using a mixer capable of evenly dispersing all the above-mentioned constituent materials, especially steel fibers, and then placed in a formwork. After 0.5 to 2 days, it is generally deserted after about 1 day, and for 48 to 72 hours, in the case of high strength fiber-reinforced cement composites, at a temperature of 20 ° C. or higher, generally 20 to 100 ° C., and ultra high strength fibers In the case of reinforcement cement composite, it is made of high strength fiber-reinforced cement composite precast structure of 60-100 MPa by steam curing under the condition of temperature 70 ℃ or higher, generally 70-100 ℃ and the relative humidity 80-100%. . By high temperature steam curing, dry shrinkage and creep deformation of high-strength cement composites are generated during a short period of steam curing, so that non-structural deformation does not occur after the construction of stairs.

It will be described again by reducing the high-strength fiber reinforced cement composite precast step (1) according to the present invention of FIG.

In the illustrated example, the high strength fiber reinforced cement composite precast staircase 1 according to the present invention comprises one staircase 10, two metal (eg, iron) side plates 21, and side plates (1) fabricated as described above. It consists of two connecting members 30 for connecting each of the upper and lower ends of the 21 and the bottom or middle dock (not shown), the staircase 10 is a plurality of tread plates 11 connected in succession and vertically interposed therebetween Consisting of a connecting plate 12, wherein each tread plate 11 has a tensile strength of the tread plate 11 itself due to the incorporation of steel fibers, but two reinforcing bars 117 (e.g., reinforcing bars) to ensure reliable tensile strength. ) Is embedded through the nut 16 as shown in Fig. 5a to be described later, the nut hole 14 is exposed on both sides of the tread plate 11 to insert the bolt 53 from the outside of the iron side plate 21 Fastening with the nut hole (14) The.

Whether the reinforcement bar 117 is disposed and the number of arrangements are arbitrary and not absolute in the present invention, but two to three are conventional.

The staircase 10 is formed of one to four sets of horizontal stepping portion 113 and the vertical connecting plate 111 integrally, either of the horizontal stepping portion 113 or the vertical connecting plate 111. A protruding insert 112 is formed at one end, and an insertion long groove 114 is formed at the other end of the horizontal stepping portion 113 or the vertical connecting plate 111 to form the precast stairs 1 and 1a. Forming precast stair unit structures 110, 120, 130, 140 are provided.

The thickness of the tread 11 is not limited and optional in the present invention, but is preferably 7 cm or less in thickness for weight reduction.

The high strength fiber-reinforced cement composite precast step unit structure assembled with the stairs 10 will be described later in detail with reference to FIGS. 3A to 5B.

Next, the side plate 21 will be described, and the side plate 21 has an upper horizontal portion 28, an inclined portion 27, and a lower horizontal portion 29, which are in a typical form, and the step plate 11 is described above. A fastening hole 24 for fixing the nut hole 115 (see FIG. 5A) of the nut 16 to which the two reinforcing bars 117 buried are fastened by fixing means such as a bolt 53 is provided for each stepping plate ( It penetrates into the position corresponding to the nut hole 115 of 11).

Next, with reference to FIG. 6 together with FIG. 1, the stress distribution connector 40 and the stress distribution connecting member 50 used for fastening the stairs 10 and the side plate 21 are demonstrated. Shall be.

The stress distribution connector 40 may be used inside the side plate 21 to relieve stress concentration around the reinforcing bar 117 in connecting the step 11 and the side plate 21 of the step 10. , The shape is formed of a pair of upper and lower wings 41 and the extension 43 for fixing the support extending inward from the body 42, the reinforcing bar 117 through-hole 44 is formed, as described above The separation distance between the pair of wings 41 is formed in accordance with the thickness of the tread 11.

On the other hand, the fastening hole 52 is formed at the position corresponding to the nut hole 115 of the nut 16 interposed at both ends of the reinforcing bar 117 embedded in the tread plate 11 in the stress dispersion connection member 50. And fastened together by bolts 53, the general shape of which is rectangular.

Therefore, in Fig. 1, the nut hole 115 on each side of the step 11 of the step 10, the through hole 44 of the stress distribution connector 40, the fastening hole 24 of the side plate 21, the stress The fastening hole 52 of the dispersing connection member 50 is fastened by the bolt 53. At this time, since both ends of each tread plate 11 is sandwiched between the two blades 41 of the stress distribution connector 40 can be effective stress distribution.

As a result, a plurality of stress distribution connectors 40 are firmly fixed to the inner side of the side plate 21 in such a manner that the ends of the extension 43 abut on one end of the body 42 and are supported. In the outer side of the), the stress distribution connecting members 50 are respectively positioned at horizontally inclined positions, so that the reinforcing bars 117 at both ends of the tread plate 11 when the tread plate 11 and the side plate 20 are connected to each other. (E.g., reinforcing bars) to alleviate stress concentrations, which not only induces load distribution to both ends of the tread plate 11, but also fills the empty space between the side plates 21 and the stairs 10, This can prevent water from seeping down or passing contaminants.

Next, the connection member 30 used to fasten the precast stairs 10 and the floor or middle dock (not shown) will be described.

The illustrated connecting member 30 has a reinforcing member 31 connecting both side plates 21 and a plurality of reinforcing bars 32 screwed or welded orthogonally to the reinforcing member 31. Since the reinforcing bar 32 has a length of 1 m or less, the reinforcing bar 32 is preferably in the form of a headed bar (not shown) in order to sufficiently increase the adhesive force between the layered and the middle. In addition, the reinforcement bar 32a can also be formed also in the upper and lower horizontal parts 28 and 29 of the both side plates 21. As shown in FIG.

In the illustrated example, a nut (not shown) is positioned at both ends of the reinforcing member 31 of the connecting member 30, and a nut hole (not shown) is formed at both ends thereof. Of course, both ends of the reinforcing member 31 may be in the form of a protruding bolt.

After the staircase 10 and both side plates 21 are joined, or at the same time, the upper and lower horizontal portions of the side plate 21 in a state in which the connecting member 30 abuts on the upper and lower ends of the both side plates 21, respectively ( The bolts 28b and 29b are inserted through the fastening holes (not shown) formed in the reinforcing plates 28a and 28b (optionally) of the reinforcing plates 28 and 29 to the nut holes 37 on both sides of the reinforcing member 31. By fastening, the connecting member 30 is firmly fixed to the side plate 20.

The precast stairs 1 according to the present invention assembled as described above temporarily support the stairwell 60 described in FIGS. 7 to 9 by using a support (not shown), and the precast stairs ( After mounting both ends of the side plate 21 of 1) to the stairwell 60, form the formwork on the connection member 30 and the plurality of reinforcing bar 32 exposed therefrom and cast concrete to the floor ( According to the present invention, the reference numerals 3 and 4 in FIG. 7 and the middle lead (see 2 in FIG. 7) are formed simultaneously with the wall (to be described later in FIGS. 8A and 8B). Fiber-reinforced cement composite precast staircase 1 is constructed, and the upper and lower ends of the staircase 10 and the bottom and middle docks are integrally connected without a gap.

In the fiber reinforced cement composite precast staircase 1 according to the present invention, one of the side plates 21 may be made of metal, and the other may be made of fiber reinforced cement composite.

The fiber-reinforced cement composite precast staircase 1a according to the preferred embodiment of the present invention shown in FIG. 2 is made of all of the side plates 21 of FIG. 4 and 5b, the reinforcing bar 117 protrudes from both sides of the tread plate 11, and the bolt portion 118 at the protruding end thereof is a stress distribution connecting member located outside the side plate 20. Except for the configuration that is firmly fastened and fixed by the nut 51 on the outside of the 50), since the configuration is substantially the same, further description of the overlapping portion will be omitted and only the differences will be mainly described.

The precast side plate 20 made of the fiber reinforced cement composite has sufficient tensile strength (approximately 7 MPa) of the fiber reinforced cement composite itself, but is sufficient by itself, but the reinforcing bar (e.g., both ends upwardly curved rebar) (not shown) Or a reinforcing wire mesh (not shown) to enhance tensile strength, and the amount and embedding position of the reinforcing bar or reinforcing wire mesh described above may be adequate to support the tensile force to be generated under the side plate. It can be determined by the calculated amount.

In addition, if necessary, the upper surface of the side plate 20 may be provided with a guide bar or a safety fence for the elderly.

The thickness of the side plate 20 is optional in the present invention, but is preferably 10 cm or less for weight reduction.

3a to 5b in the stair unit structure (110, 120, 130, 140) according to a preferred embodiment of the present invention assembled into the fiber-reinforced cement composite precast stairs (1, 1a) according to the present invention This will be described.

First, the step unit structure (110, 120, 130, 140) according to a preferred embodiment of the present invention assembled into a high-strength fiber reinforced cement composite precast step of the present invention, shown in Figures 3a to 3d and 5a As shown in Figures 4a to 4d and 5b by inserting and fixing bolts (not shown) on the opposite side of the side plate (not shown) while the nuts 115 or 16 are connected to both ends of the reinforcing bar 117 as shown. As shown, the bolt portion 118 is formed on both ends of the reinforcing bar 117, and the side plate (not shown) may be in the form of connecting a nut (not shown) on the opposite side.

Construction of the staircase 10 according to the present invention is to cast and cure the side plate 20 and the stair unit structure (110, 120, 130, 140), respectively (of course, if the side plate 21 is made of metal, the stair unit structure ( Only 110, 120, 130 and 140, respectively, pour, curing}, assembling them to make a precast staircase 10, and then to move the crane to the site of the stair mounting site consists of mounting.

In the present invention, the area and the number of the reinforcing bars as the reinforcing bar 117 depend on the magnitude of the load, but are arbitrary, but generally two to three are arranged.

3A to 3D are perspective views of nut mounting type step unit structures 110, 120, 130, and 140, respectively, according to one preferred embodiment of the present invention, and fiber reinforced cement composite step unit structures 110, 120, according to the present invention. 130 and 140 may be either high strength or ultra high strength, but in the case of high strength, the mixing ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.9 by weight. -1.7: 0.1-0.3: 0.02-0.1: 0.01-0.06: 0.03-0.2: 0.2-0.45, the strength after curing is 60-100 MPa, and 1 to 4 sets of horizontal stepping portions 113 and vertical connecting portions ( 111 is formed, and one end of either the horizontal stepping portion 113 or the vertical fastening portion 111 is formed with a protruding insert 112 and the horizontal stepping portion 113 or the vertical fastening portion ( On the other end of 111a), an insertion long groove 114 is formed. To form a horizontal Didim unit 113 and the vertical coupling parts 111 are formed integrally, the plurality of fastening continuously cross stairs (the numeral 10 in FIGS. 1 and 2).

Since the manufacturing process has already been mentioned in the description of FIG. 1, further description will be omitted.

First, the shape of the nut-mounted stair unit structure 110 shown in FIG. 3A is upward from the rear step of the horizontal step portion 113 and the horizontal step portion 113 having an insertion long groove 114 at the front bottom end. It extends and is integrally composed of a longitudinal fastening portion 111 having a protruding insert 112 at its extended end. Optionally, a plurality of anti-slip grooves 116 may be formed at the front upper end of the horizontal stepping portion 113. Optionally, a plurality of reinforcing bars 117 (e.g., reinforcing bars) are embedded in the horizontal stepping portion 113 via nuts (not shown) (two in the example shown) and nut holes on the sides. 115 is exposed. Therefore, when assembling with a staircase (10 in FIG. 1), the protruding insertion slot 112 of the stair unit structure 110 is inserted into the insertion long groove 114 of the other stair unit structure 110, and the insertion long groove 114. ) Is assembled in a form in which the protruding insert 112 of the other staircase unit structure 110 is inserted.

Each of the types of nut-mounted stair unit structures 120, 130, and 140 shown in FIGS. 3B, 3C, and 3D is integrally provided with two, three, and four sets of nut-mounted stair unit structures 110 shown in FIG. 3A, respectively. Since the detailed configuration is essentially the same as the formed form, the description thereof will be omitted.

On the other hand, Figure 5a is a schematic example of the horizontal step portion 113 of the nut mounting step unit structure (110, 120, 130, 140), the left side is a side view and the right side as a cross-sectional view for convenience, Two and three reinforcing bars 117 are embedded in the horizontal stepping portion 113 via the nut 16, and the nut hole 115 of the nut 16 is exposed to the outside.

Therefore, in the nut mounting type stair unit structure 110, 120, 130, 140, as described in FIG. 1, the bolt is inserted into the nut hole 115 from the outside of the side plate 21 and screwed thereto. The staircase 10 and the side plate 21 are fastened to each other.

4A to 4D are perspective views of bolt-mounted stair unit structures 110, 120, 130 and 140, respectively, according to another preferred embodiment of the present invention, wherein the reinforcing bar 117 is directly without interposing a nut. No further explanations are made here as they are essentially the same as in FIGS. 3A-3D, except that the bolts 118 are formed at the exposed ends of the reinforcing bar 117 and embedded in the horizontal step portion 113. The description will be omitted.

On the other hand, Figure 5b is a schematic diagram showing an example of the bolt-mounted stair unit structure (110, 120, 130, 140), respectively, the left side is a side view and the right side as a cross-sectional view for convenience, the horizontal step portion 113 Two and three reinforcing bars 117 are embedded therein, and both ends of the reinforcing bars 117 are exposed to the outside, and bolts 118 are formed at the ends thereof.

Therefore, in the bolt-mounted stair unit structure (110, 120, 130, 140), as described in Figure 2, the step (10) by screwing the nut 51 to the bolt portion 118 protruding from the outside of the side plate 20 The side plates 20 are fastened to each other.

Since the formwork for manufacturing the stair unit structure (110, 120, 130, 140) is used repeatedly, it may be common to use the iron formwork for its manufacture, the formwork is made of plastic or reinforcement for ease and manufacturing cost reduction It can also be used by forming a mold out of plastic (FRP).

Optionally, in forming the step unit structure and / or the side plate according to the present invention into a fiber reinforced cement composite, a variety of colors may be obtained by pre-mixing and stirring a variety of organic or inorganic pigments known in the art, followed by molding and curing. By manufacturing with, it is possible to simplify or omit the color finishing work after the completion of the stairs.

FIG. 7 shows the precast stairs 10 mounted on the stairwell 60 supported by the club 90 according to the preferred embodiment of the present invention, and then the stowage 3, 4 and the midsole 2 of the wall. It is a schematic diagram which shows the construction method which concerns on this invention simultaneously with the reference numeral 80 in FIG. 8B.

First, referring to FIG. 9 with respect to the stairwell 60, the stairwell 60 may be formed of a high strength fiber reinforced cement composite, but is preferably formed of a very high strength fiber reinforced cement composite.

Specifically, the mixing ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.9 to 1.7: 0.1 to 0.3: 0.02 to 0.1: 0.01 to 0.06: 0.03 to 0.2: 0.2 to 0.45 by weight. It is composed of a high strength of 60 to 100 MPa after curing, porosity may be 7% or less, generally 3 to 7%, but preferably cement, fine aggregate, filler, fine ceramic, water reducing agent , The ratio of steel fiber and water is 1: 0.8 to 1.5: 0.2 to 0.4: 0.05 to 0.3: 0.02 to 0.07: 0.05 to 0.4: 0.18 to 0.3 in weight ratio, and the strength after curing is 100 to 200 MPa, generally Ultra-high strength of 100 to 150 MPa, porosity of 5% or less, generally 3 to 5% of porosity.

In the stairwell 60, at least two reinforcement bars 61 are embedded, and reinforcement members 62 are provided at both ends thereof, and protrusions 63 are exposed to the outside from the reinforcement members 62. In addition, the upper part of the stairwell 60 is provided with a plurality of protruding roots 64 protruding upward. On the other hand, the front portion of the stairwell 60 may be formed as an inclined protrusion 65, but this is not limitative in the present invention and is optional.

Reinforcement protrusions 63 on both sides of the stairwell 60 are formed integrally with the wall after the concrete is placed to enhance structural stability, and the plurality of the ribs 64 exposed upward from the top of the stairwell 60 are After the concrete is placed to give the stairwell 60 and the poured upper concrete and sufficient adhesive strength, they together form a dock or middle dock.

The height of the stairwell 60 has, for example, a thickness (height) of about 5 cm when the thickness of the stairwell (commonly referred to as the floor and midwell) is 15 cm, the width of which is to support the inclined side plate 20. It should have a minimum width so that it can be easily shaped to accommodate the rebar placement of landing slabs.

As shown in FIG. 7, the stairwell 60 is used to reinforce the formwork because it lacks the bearing capacity of the formwork to mount the precast stairs 10 on the landing formwork. 90 is supported on the stairwell 60 supported.

Reference numeral 32 in the drawings is a reinforcing bar.

FIG. 8A is a schematic side view showing the construction method according to the present invention for simultaneously constructing the chamfers 3 and 4, the middle chamfer 2 and the wall (reference numeral 80 in FIG. 8B) in the example of FIG. A cross-sectional view taken along line II of FIG. 8A will be described together for convenience.

In FIG. 8A, the upper horizontal portion 29 and the lower horizontal portion 28 of the precast stairs 10 are mounted on the stairwell 60 supported by the club 90, respectively. In the example shown, the wall forming formwork is a part of the standardized rectangular formwork 70 (ie, the outer portion of the region defined by V1, h1, V2, h2) and the side plate 20 (ie, V1, can be composed of a number of standardized triangular formwork 70a abutting the inclined portion 27 of the region defined by h1, V2, h2, one side plate 20 of the precast staircase 10 It itself functions as a formwork. On the other hand, the part shown with the dotted line is the bottom 4 and the middle 2, respectively.

Thus, as shown in FIG. 8B, one side plate 20 functioning as a formwork may be fixed in the wall 80 to be constructed (ie, inside the wall 80 which is not coplanar with the formwork 70, 70a). Into a different planar position that can be fixed and supported by the wall 80), whereby the wall 80, the bottoms 3 and 4, and the middle 2 are formed at the same time, It is possible to provide a work space and a moving line using the precast stairs during construction, so that the precast stairs can be installed very economically and efficiently.

On the other hand, in the case where the formwork of the wall is a permanent formwork of various forms such as aluminum formwork or any other form of temporary formwork, it is easy to form a wall formwork, in which the side plate forms part of the formwork, compatible with the existing formwork. There is a number.

As described above, the fiber-reinforced cement composite precast stair unit structure according to the present invention has a high strength to ultra high strength of 60 to 200 MPa and has excellent durability and load resistance due to relatively excellent ductility behavior compared to the existing high strength concrete. In addition, it has excellent water-tightness and excellent noise reduction characteristics due to walking movement load, and by using such a step unit structure, the prefabricated high strength to ultra high strength fiber reinforced cement composite precast system stairs according to the present invention can be provided simply and easily. It is possible to install by simply mounting it after supporting the stairwell with the copper bar, without the formwork or the moving of the staircase itself at the site, and assembling the formwork of the wall and the landing by using the side plate as part of the wall casting formwork. It is possible to form them integrally by simultaneously pouring them, and in the process, not only can the precast staircase be a work passage, but also the wall can support the load of the inclined side plate, thus reducing labor cost and construction cost by shortening construction period. As a result, it is possible to reduce manufacturing cost and transportation cost, and to shorten the air, thereby replacing labor-intensive and air-required stair work with the prefabricated fiber-reinforced cement composite precast system stairs according to the present invention. Will provide a significant turning point and will replace much of the existing reinforced concrete or steel staircases.

Claims (12)

The mixing ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.9 to 1.7: 0.1 to 0.3: 0.02 to 0.1: 0.01 to 0.06: 0.03 to 0.2: 0.2 to 0.45 by weight. After curing, the strength is 60 to 100 MPa; One to four sets of horizontal stepping portions and the vertical connecting portion are integrally formed, and one end of the horizontal stepping portion or the vertical connecting portion is formed with a protruding insert, and the other end of the horizontal stepping portion or the vertical connecting portion is formed with an insertion groove. Done Precast Stair Unit Structure. The precast stair unit structure according to claim 1, wherein at least two reinforcing bars are embedded in said horizontal stepping portion. The precast stair unit structure according to claim 2, wherein the reinforcing bar is exposed at both ends of the nut hole through the nut, or is extended to both sides of the horizontal stepping portion, and a bolt portion is formed at the end thereof. The precast stair unit structure according to any one of claims 1 to 3, wherein at least a plurality of non-slip grooves are formed at the front upper end of the horizontal stepping portion. A staircase formed by successively fastening a stair unit structure in which 1 to 4 sets of horizontal stepping plates and vertical connecting plates are integrally formed; It consists of both side plates fastened to the above steps: In the above step unit structure, the blending ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.9 to 1.7: 0.1 to 0.3: 0.02 to 0.1: 0.01 to 0.06: 0.03 to 0.2: Consisting of 0.2 to 0.45 and composed of high strength fiber-reinforced cement composite having a strength of 60 to 100 MPa after curing Precast Stairs. The method according to claim 5, wherein at least one of the two side plates is made of metal or the blending ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.8 to 1.5: 0.2 to 0.4: 0.05. -0.3: 0.02-0.07: 0.05-0.4: 0.18-0.3, The precast staircase comprised from the ultrahigh-strength fiber reinforced cement composite of 100-200 Mpa after hardening. The precast stair according to claim 5 or 6, wherein at least one reinforcing bar is embedded in the horizontal stepping plate of the staircase unit structure for load bearing reinforcement, and both ends of the reinforcing bar are physically connected to and supported by the side plate. The precast stair according to claim 5 or 6, wherein a connecting member having a reinforcing member and a plurality of reinforcing bars connected orthogonally to the reinforcing member interconnects each of the upper and lower horizontal portions of both side plates. The said dispersion | distribution connector for stress dispersion | distribution of Claim 5 or 6 which has a pair of wings for clamping the said step board, and the extension part extended downwards between said horizontal step board and said side plate, A precast staircase having a stress distribution connecting member positioned and screwed together on an outer side thereof, wherein the body and the extension portion of the stress distribution connector are in contact with the extension and the body of the different stress distribution connector. Construction method of the precast stairs consisting of the following steps: (A) forming a precast staircase according to claim 5, comprising a fixing step of screwing a plurality of fiber reinforced cement composite precast stair unit structures according to any one of claims 1 to 3 together and screwing to a side plate. Doing; (B) after or at the same time as the precast step fabrication step, a fixing member fixing step of fixing the connecting member and the connecting member having a plurality of reinforcing bars orthogonally to the reinforcing member to each of the upper and lower horizontal portions of the two side plates; (C) mounting a stairwell on a support having a reinforcing bar at the bottom and midst forming portions; (D) a mounting step of positioning the precast staircase to which the connection member is fixed on the stairwell; (E) a form assembly step of assembling the floor and middle dock and wall construction formwork, so that one of the two inclined side plates can function as formwork at a position that can be fixed in the wall to be constructed; And (F) pouring concrete into the formwork so as to simultaneously form the bottom, middle and wall; 11. The method according to claim 10, wherein the side plate is made of metal or the mixing ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water is 1: 0.8 to 1.5: 0.2 to 0.4: 0.05 to 0.3: 0.02 by weight. A construction method comprised of -0.07: 0.05-0.4: 0.18-0.3, and consisting of a fiber reinforced cement composite whose strength is 100-200 Mpa after hardening. The mixing ratio of cement, fine aggregate, filler, fine ceramic, water reducing agent, steel fiber and water in the above-mentioned step staircase is 1: 0.8 to 1.5: 0.2 to 0.4: 0.05 to 0.3: A construction method comprising 0.02 to 0.07: 0.05 to 0.4: 0.18 to 0.3, and having a high strength fiber-reinforced cement composite having a strength of 100 to 150 MPa after curing, wherein a plurality of roots protrude upward.

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