JP2007154511A - Staircase structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a staircase structure producing less noise, particularly reducing low frequency noise, with inorganic treads. <P>SOLUTION: The staircase structure 1 made of steel comprises stair girders 2 and the treads 3 formed of a nonmetal inorganic material with a thickness of 20-60 mm. The tread 3 can be provided with a tread part 3A and a riser part 3B. The staircase structure 1 is fixed onto a base 4 through a base member 5. The stair girder 2 comprises vertical parts 2A and an inclined part 2B, and the treads 3 are fixed by bolts 6 in the inclined part 2B. The staircase structure 1 shows a remarkable reduction of low frequency noise by noise measurement. The staircase structure can be provided with a stair mat, and the stair mat comprising a nosing part and a tread part particularly with a high step-missing preventing effect in respect of safety is used to provide the staircase structure having excellent safety as well as noise suppression from low frequency to high frequency. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a staircase structure including a steel stair girder and a tread board. More specifically, the present invention can improve the soundproofing and safety of the staircase from both the structure of the staircase body and the staircase mat. It relates to the staircase structure.

  The so-called steel staircase has been used in many buildings such as apartments because it has a relatively low cost for its high strength. However, the steel staircase is apt to generate radiated sound due to bending vibration of the tread, the vibration transmission to each part of the staircase is fast, and a plurality of places are likely to become sound sources when one place is vibrated. Therefore, there are weak points regarding noise and vibration. On the other hand, steel stairs need special consideration in terms of safety such as stepping off, and non-slip properties are necessary for both the nosing material and the treading surface. In particular, it is important to prevent the nosing material and the treading from stepping off.

Steel staircases have a large amount of pronunciation, so many proposals have been made for soundproofing measures. Rubber, resin sheets, carpets and other mats are installed on the treads and landings to prevent direct contact between the footwear and the treads. In addition, there are also proposed methods of attaching a restraint type damping material or a non-restraining type damping material to a tread board, a landing or a kick-in, or using a tread board as a damping steel plate (see, for example, Patent Documents 1 and 2). ).
JP 2003-253839 A JP-A-5-156769

  In steel staircases, in terms of safety, such as stepping off, a stair mat that focuses on these brightness differences is not used, even though it is highly effective in preventing stepping off by increasing the difference in brightness between the nosing material and the treading surface. . In addition, the conventional proposals for many soundproofing measures can change the sound quality of the radiated sound generated by the bending vibration of the tread, but the bending vibration is generated as it is, so that the improvement of the high frequency sound is limited. Although the application of a restraining type damping material or the use of a damping steel plate can improve the bending vibration of the tread board, it still has poor soundproofing performance, and has not led to the elimination of particularly low frequencies.

  An object of the present invention is to obtain a steel stair with a small amount of sound generation, in particular, low-frequency noise is reduced by a non-metallic inorganic tread. Further, the present invention further provides a staircase structure that is excellent in safety and noise suppression from low frequency to high frequency as well as safety by a stair mat having a step nose portion and a tread surface portion that are highly effective in preventing stepping off. The challenge is to obtain.

  The present invention is a staircase structure comprising a steel stair girder and a tread board, wherein the tread board is made of a non-metallic inorganic material having a thickness of 20 to 60 mm, and both longitudinal ends of the tread board are fixed to the stair girder. It is related to the staircase structure.

  The present invention is based on the knowledge that in steel staircases, vibrations are easy to be transmitted on the material, so that it is difficult to prevent sound and vibrations, and that the properties are particularly attributable to the treads and kicks used in steel staircases.

  When the present inventor went up and down many steel stairs and investigated the feature that the sound volume was reduced, he found a certain common point. In other words, steel staircases with low sound output are of the type with high treadle rigidity and low bending vibration, especially those that have been welded to reinforce the stiffening, or the bending and stiffening of the treadle. It was the type that was welded. Furthermore, in the case of a combination of a stair girder and a step board with a high bending rigidity, it has been found that noise is further reduced, and in particular, the amount of low frequency sound is low.

  Based on these findings, the present inventor conducted many experiments. By making the treadle made of a non-metallic inorganic material, low-frequency noise, which is difficult to obtain a reduction effect at other costs at low cost. The knowledge that a stair with little noise can be obtained was obtained.

  According to the present invention, a steel plate that produces a small amount of sound, in particular, low-frequency noise is reduced by a tread made of a nonmetallic inorganic material having a thickness of 20 to 60 mm or by a tread that includes a tread portion and a kick-in portion. You can get stairs.

  The purpose of suppressing noise from low frequency to high frequency in steel stairs is realized by a tread made of non-metallic inorganic material without increasing the cost and without sacrificing safety.

  In the present invention, the steel stair tread is made of a non-metallic inorganic material. In general, a steel tread of a steel staircase has a thin plate thickness of about 2 mm to 6 mm, is easy to vibrate, easily emits radiated sound, and is difficult to attenuate vibration, and is likely to generate noise. When this tread is made of a non-metallic inorganic material, artificial stones and the like have a characteristic that they are brittle, so it is preferable to use them with a thickness of about 5 to 10 times, that is, about 20 mm to 60 mm from the viewpoint of safety. It is difficult to vibrate and radiated sound is hardly generated, and particularly low frequency sound that is difficult to reduce can be reduced. If the thickness of the tread of artificial stone or the like is less than 20 mm, a problem arises in safety, and if it exceeds 60 mm, it becomes heavy and workability gradually deteriorates.

  The non-metallic inorganic material (hereinafter, sometimes simply referred to as “inorganic material”) is not particularly limited, but is composed of non-metallic minerals such as concrete, mortar, PC plate, ALC plate, extruded hollow cement plate and the like. Mention can be made of artificial or natural stone. These non-metallic inorganic materials may contain a metal such as iron as a reinforcing bar or the like embedded therein. Such a tread can fix low frequency noise effectively by fixing a part of the tread on the stair girder. Furthermore, in order to suppress low-frequency noise, it is effective to increase the rigidity of the tread, particularly to increase the bending rigidity.

  The bending rigidity of the tread is not particularly limited and can be increased by using various means. For example, the tread can be formed of a thick inorganic material as described above, and the bending rigidity or the like can be increased by itself. Further, as a means for reinforcing the tread, it is also effective to fix both ends in the longitudinal direction of the tread on the stair girder.

  When a flat plate-shaped normal tread is configured in a three-dimensional form such as an uneven shape and a hollow portion, it is possible to reduce the weight and improve the bending rigidity, and in particular, a flat surface different from the plane formed by the tread surface portion of the tread plate. The bending rigidity of the tread can be improved by providing a portion to be formed, for example, a kicking portion or the like on the tread. If the tread board with a kick is used, the normal tread surface can be maintained, and it is not necessary to separately provide the tread board and the kick, so that the cost can be further reduced. The kick-in portion can be provided so as to protrude from the tread surface portion of the tread plate to the upper side or the lower side, or from both. As long as there is no hindrance to the stairs, a reinforcing part can be provided below the tread.

  If the tread has a shape in which the short side is substantially L-shaped when viewed in cross-section, including the kicked portion, the amount of sound generation is further reduced. For example, when a tread board is formed into a hollow extruded cement molded board, in order to prevent resonance sound of the air column in the hollow part, the tread board is sealed by, for example, plugging the openings at both ends in the longitudinal direction, and the resonance sound is easily generated. It can be solved. At this time, if the role of the plug is combined with an internal thread and cement, the opening is closed without a gap, and the internal thread position is designed at a fixed position, the mounting position of the tread and the stair girder can be inevitably set. Attaching work becomes easy.

  There are no particular restrictions on the shape, structure, material, etc. of the staircase girder, but the low frequency noise of the staircase structure can be further improved by using a type having a bending rigidity equal to or greater than that of an 8 mm thick steel plate.

  In the present invention, a stair mat can be provided on the tread. The stair mat can be formed from various rubber materials including rubber and the like made of various components. Stair mats can be glued to the tread.

  The stair mat can be provided with a tread part and a nose part. In this case, the luminance difference between the tread surface portion and the nose portion of the stair mat can be made sufficiently large, and the luminance difference can be designed by brightness, fluorescence, and the like. With a sufficient brightness difference, the tip of the staircase can be clearly seen, and stepping off can be prevented.

  Further, the stair mat has an uneven portion on the surface, and a fine uneven portion can be formed on the protruded portion of the uneven portion. The uneven portion and the fine uneven portion on the surface of the stair mat can be obtained by designing in advance in a mat forming mold. The mat surface can be formed into patterns such as deep irregularities, which is useful for improving the aesthetics, and also by making the irregularities such as slight shallow irregularities on the convexes. As a result, the non-slip property is further increased, and a much safer staircase with a low sound volume from low frequency to high frequency can be obtained.

  As described above, the steel stair tread is preferably provided with a kick portion, the tread is formed of an inorganic material, both ends of the tread are fixed to the stair girder, and a rubber mat with a nose material is adhered to the tread. Wear it and make the difference in luminance between the tread part and the nose part of the rubber mat with nosing material large enough.

Hereinafter, embodiments of the present invention will be described in more detail.
Steel staircases are originally premised on being able to be used at low cost. For example, even if a complicated soundproofing treatment is performed for the purpose of soundproofing and a high effect is obtained, it is not acceptable at high cost. Normally, the mid-high frequency sound of a steel staircase can be considerably improved by the surface finishing mat of the staircase, but it is impossible to reduce the low-frequency sound. When the step board of the staircase is a steel plate, the cost increases such as a bending rigidity reinforcing material, welding cost, rust prevention coating, etc., and there is no merit of using the steel material for the step board.

  Therefore, when an inorganic board is used, the cost is lower than that of a steel tread board that reinforces rigidity, and the amount of sound generation is remarkably reduced. In particular, low-frequency sound is reduced. Specific examples of the inorganic board include a concrete board, a PC board, a hollow extruded cement molded board, and an ALC board.

  When such an inorganic board is used as a tread, if a part including a kicked portion and having a short side cross section is substantially L-shaped, the bending rigidity increases and the amount of sound generation is not reduced. At the same time, the installation of the kick-in is completed, making assembly work quicker and easier, resulting in construction advantages.

  The inorganic plate is easy to set, for example, a fixed portion for a stair girder at a fixed position on both ends at the time of molding, and this is a great merit for suppressing an increase in cost of providing a separate fixed portion. The fixing portion is not particularly limited, and various means can be used, but a screw fixing portion such as a female screw is preferable. In the present invention, of course, a separate fixing portion may be provided.

  When using an inorganic plate that has a hollow portion and an open end, such as a hollow extruded cement molded plate, the hollow portion is prone to air column resonance, so it is sealed by plugging the open ends at both ends. Then, it is only necessary to avoid the generation of resonance. The opening is a fixing part such as a female screw, for example. If the gap is filled with cement or the like and replaced with a stopper, the fixing part can be set at a fixed position, which is convenient for assembly.

  Low frequency sound can be reduced sufficiently by making the treadle a non-metallic inorganic board, but if you want to obtain a further great improvement effect, the stair girder should have a bending rigidity equal to or greater than that of an 8mm thick steel plate. The low frequency can be further reduced.

  If it is acceptable in terms of cost, it is preferable from the viewpoint of noise prevention to use the above-mentioned tread board and the stair girder together. The above method is the most inexpensive and reliable method for improving the low frequency sound of steel stairs.

  In addition, in order to prevent a direct contact sound between footwear and a tread, a stair mat is optimal as a finishing material or a surface material of a stair. As a requirement to be provided for the stair mat, from the viewpoint of sound, it is excellent in shock absorption and restoration, and in terms of safety, a nose material or a nose part can be provided as necessary. The difference in brightness between the nose and the staircase mat surface is sufficiently large. The tip of the staircase can be clearly recognized and is non-slip.

  One measure of brightness is to measure the brightness of the tread (a) and the brightness of the nosing material (b) according to JIS-C-7614, etc., where a / b is the brightness ratio and 1.5 or more is a sufficiently large brightness. In comparison, accidents that cause stepping off are very few.

  The non-slip property is particularly required to be non-slip when wet with water. Generally, rubber is difficult to slip when dried, but when wet, a water film is formed, which can be very slippery. Therefore, conventionally, it has been made difficult to form a water film with grooves and uneven patterns, but this is not perfect. For the sake of completeness, a slight uneven pattern can be provided on the convex surface of the uneven pattern. As a result, it is possible to make it difficult to form a water film on the convex portion itself, and even if it gets wet, it is more difficult to slip, and further improvement on the safe side is possible.

  The non-slip property can be based on a measured value of a floor slip resistance coefficient (A) such as JIS-A-1407 when the rubber is wet and a floor slip resistance coefficient (B) when the rubber is dried, and the ratio (A If / B) is 0.7 or more, it is judged that it is very difficult to slip even when wet.

  The rubber of the stair mat is not particularly limited, and rubbers and elastomers can be used alone or in combination, and various rubbers and elastomers may be used in combination. For these rubbers, fillers, plasticizers and other additives generally used in the rubber industry and the like may be used.

  In particular, the rubber mat and the inorganic board are preferably fixed via an adhesive layer. In this case, as the adhesive, a viscous viscoelastic body is suitable, such as a double-sided tape, a viscous viscoelastic body, An adhesive material can be illustrated. Among them, it is desirable to use a solvent-free type in order to prevent the solvent from evaporating in the environment. In addition, since there are reports of health problems caused by volatilization of phosphorus plasticizers and volatilization, it is demanded from the future suppliers that such products should not be used. Under such circumstances, solventless double-sided tape and solventless viscoelastic materials based on recycled rubber, which are rich in viscosity, inevitably contain vulcanized gel and carbon, and are resistant to heat and creep. Due to its excellent characteristics, there is no problem even if it is relatively thick, for example, 0.5 to 3 mm. A constrained damping material using a tread and a rubber mat as a constraining material is automatically formed. It becomes easy to reduce the vibration of walking while mitigating the walking impact caused by raising and lowering.

  The sound of raising and lowering stairs seems to be a sounding mechanism similar to the floor impact sound. That is, the sound is a mixture of a light floor impact sound and a heavy floor impact sound. In particular, the low frequency sound is similar to the heavy floor impact sound. This is thought to be due to the fact that weight shift is inevitably involved when moving up and down and the impact duration is relatively long. Therefore, bending vibration is suppressed by making the tread board to be much harder than the steel material and thicker inorganic board, and accordingly, the radiation volume from the tread board is remarkably reduced.

The present invention will be described in more detail with reference to the drawings.
FIG. 1 is a side view of a staircase structure according to an example of the present invention. FIG. 2 is a front view of the staircase structure of FIG. FIG. 3 is a perspective view of an example of a tread according to the present invention. FIG. 4 is a perspective view of a tread of another example according to the present invention. FIG. 5 is a partial cross-sectional view of a staircase mat according to the present invention, (a) is a cross-sectional view showing a nose portion, and (b) is an enlarged cross-sectional view of the surface portion of (a). FIG. 6 is a perspective view of still another example of the tread according to the present invention.

  FIG. 1 shows a side view of an example step structure 1 of the present invention. The staircase structure 1 includes a staircase girder 2 and a tread board 3, and the tread board 3 is made of a nonmetallic inorganic material having a thickness of 20 to 60 mm. Further, the tread plate 3 can be provided with a tread surface portion 3A and a kick-in portion 3B. The staircase structure 1 is fixed on a base 4 via a base member 5. The stair girder 2 includes a vertical portion 2A and an inclined portion 2B, and the tread plate 3 is fixed by bolts 6 in the inclined portion 2B. The staircase structure 1 shows a significant reduction in low frequency noise due to noise measurements.

  FIG. 2 shows a front view of the staircase structure 1. The staircase structure 1 can be obtained by providing the base member 5 with the stair girder 2 and fixing the step board 3 to a predetermined position of the inclined portion 2B of the stair girder 2 with a bolt. As in the case of FIG. 1, the tread 3 is obtained by integrally molding the kicked portion 3B with the tread portion 3A, but other types of treads may be used.

  FIG. 3 is a perspective view of an example of a tread board 3 used in the staircase structure 1 of FIG. The tread board 3 is made of a hollow extruded cement molded board, and is formed as an integrally molded product of the tread surface portion 3A and the kick-in portion 3B. There are two hollow portions 3C in the longitudinal direction of the tread surface portion 3A of the tread board 3, and both ends are plugged with mortar 3D. At this time, the iron piece 7 with the female screw cut is also at a distance of 200 mm from the core / core. It is buried and fixed in mortar.

  FIG. 4 is a perspective view of another example of the tread 13. The tread 13 is produced by attaching iron pieces 17 having female threads to the formwork at intervals of 200 mm, arranging the bars, pouring the concrete, and removing the mold. The tread 13A and the kick 13B are simultaneously formed. Molded.

  FIGS. 5A and 5B are partial cross-sectional views of the rubber mat 8 with a nose material. The mat 8 includes a tread portion 8A and a nose portion 8B. Several groove portions 8C are formed in the longitudinal direction on the upper surfaces of the tread surface portion 8A and the nose portion 8B, the groove portions 8C become concave portions, and the convex portions 8D are formed between the groove portions 8C, and the concave portions and the convex portions are alternately arranged. It is designed to be formed. An adhesive layer 9 is formed on the lower surface of the mat 8. As shown in detail in FIG. 5B, shallow unevenness 8E is formed on the tread portion 8A and the convex portion 8D of the nose portion 8B.

  FIG. 6 is a perspective view of still another example of the tread plate 23. The tread plate 23 is formed of a hollow extruded cement molded plate 23A having no kick-in portion. Similar to the tread plate 3 in FIG. 3, both end portions of the hollow portion have a space of 200 mm between the iron pieces 7 whose female threads are cut, and are plugged with mortar 3D. Specifically, a hollow extruded cement plate is prepared, and at both ends of the hollow portion, in the same manner as in Example 1, with an iron piece and a mortar in which a female screw is cut, the female screw becomes a core / core 200 mm and cured. Dry and make stoppers and fixing parts at both ends of the hollow part.

Hereinafter, with reference to the drawings, the present invention will be described more specifically based on examples and comparative examples.
FIG. 7 is a perspective view of a tread according to a comparative example. 8 is a cross-sectional view of the tread of FIG. 7, (a) is a cross-sectional view of the tread taken along the line AA in FIG. 7, and (b) is a tread taken along the line BB. FIG.

Example 1
A staircase structure as shown in FIGS. 1 and 2 is constructed. A tread board as shown in FIG. 3 is produced, and as shown in FIGS. 1 and 2, a stair girder (steel material thickness 10 mm) is attached. The tread board is integrated with the kick-in part. 45mm thick x 275mm wide x 140mm kick height x 1000mm long hollow extruded cement plate (two hollow parts), iron pieces with internal threads cut installed in the hollow part with a core / core 200mm pitch and fixed with mortar It is made to dry and it is set as the stopper of the both ends of a tread board hollow part.

  The sound performance experiment is performed by carrying a staircase prepared by attaching the tread plate as shown in FIGS. 1 and 2 into an anechoic chamber and installing a rubber mat with a nose material as shown in FIG. 5 on the tread surface of the tread plate. This rubber mat is affixed to the tread using a solventless viscoelastic body on the lower surface. Hereinafter, the rubber mat is the same for both the examples and comparative examples.

  When an iron ball (diameter: 50 mm, 880 g) is naturally dropped from a height of 300 mm onto the rubber mat (it is dropped onto the rubber mat of the third stepping plate from the bottom), a heavy floor impact with impact force characteristics (II) Two kinds of impacts when a source (hereinafter referred to as “SBR ball”) is naturally dropped onto a rubber mat of a third step tread from a height of 600 mm, each noise at a microphone position 1 m in front of the tread and 1 m in height Measurements were performed and the results are shown in Table 1.

  For the rubber mat with a nosing material, the luminance is shown in Table 1 with the luminance of the mat tread surface (a) and the nosing material (b) determined in accordance with JIS-C-7614 and a / b as the luminance ratio. Similarly, the non-slip property of the mat is in accordance with JIS-A-1407. For each of the nosing material and the mat tread, the floor slip resistance value (A) when wet with water and the floor slip resistance value when dried (B) is measured and A / B is determined and shown in Table 1.

(Example 2)
A staircase structure as shown in FIGS. 1 and 2 is constructed. In this example, a tread board as shown in FIG. 4 is produced. Inside the formwork, the bar arrangement and the female screws provided at both ends of the long side are fixed in place, and the concrete is poured to produce a tread with a kick-in part 50 mm thickness x 275 mm width x 140 mm kick-in height x 1000 mm length To do. A staircase structure is constructed in the same manner as in Example 1 and the sound performance is measured. Specifically, the four treads of Example 1 are replaced with the four treads produced by the method of this example, and the same rubber mat with a nose material used in Example 1 is adhesively bonded to the iron of the impact source. The sphere and the SBR ball are naturally dropped, and noise measurement is performed under the same conditions as in the first embodiment. The results are shown in Table 1.

(Example 3)
A staircase structure as shown in FIGS. 1 and 2 is constructed, and a tread board as shown in FIG. 6 is used. This tread has a hollow extruded cement plate (two hollow portions) 45 mm thick × 275 mm wide × 1000 mm long.

  The obtained four treads were replaced with the four stair treads used in Example 2, the rubber mat with the nosing material used in Example 1 was adhesively bonded, and under the same impact source and measurement conditions as in Example 1, Noise measurement was performed and the results are shown in Table 1.

(Comparative Example 1)
Four treads as shown in FIGS. 7 and 8 are produced and replaced with the treads used in Example 1, and a staircase structure as shown in FIGS. 1 and 2 is constructed.

  7A and 7B are perspective views of the tread 33 used in Comparative Example 1. FIG. 7A is a cross-sectional view taken along the line AA of the tread 33, and FIG. The tread board 33 bends the striped steel plate on the nose side and the kick side to form a tread surface part 33A, a kick part 33B, and a nose part 33C. The tread 33 is welded with two light angle steels 33D (40 mm × 40 mm × 3.2 mm thickness) in the long side direction on the back side, and similarly with the angle steel 33E having the same cross section at both ends of the short side. However, this is provided with mounting holes 33F having a pitch of 200 mm. For fixing the tread plate 33, bolts and nuts through the mounting holes 33F are used.

  The same rubber mat with a nose material as used in Example 1 was adhered to the steel stair board obtained, and noise measurement was performed in the same manner as in Example 1. Table 1 shows the results.

With reference to Table 1, this invention is demonstrated in detail from the result of an Example and a comparative example.
First, regarding the performance of the rubber mat with the nosing material, the surface finishing materials of Examples 1 to 3 and Comparative Example 1 have an influence on the sound performance, so the common rubber mat with the nosing material is used. As shown in Table 1, this rubber mat with nosing material has a luminance ratio of a / b = 1.75 based on the luminance (a) of the rubber mat tread and the luminance (b) of the nosing material. As described above, the difference between the nosing material at the tip of the staircase and the rubber mat tread surface can be clearly seen, and no stepping off occurs.

  The rubber mat with nosing material is non-slip, and the ratio of floor slip resistance value (A / B) when the nosing material and the rubber mat tread are wet (A) and when dried (B) is 0. 81, 0.83 on the tread, which is 0.7 or more of the non-slip standard, and it can be seen that it is very difficult to slip even when wet.

  Next, with respect to staircase noise, Example 1 is the one in which a stopper and a fixing part are formed by using an iron piece and a mortar in which female threads are cut at both ends of a hollow extruded cement board as a tread. Compared with Comparative Example 1, which is a steel tread that has been integrally molded including the recessed portion and is a steel tread that has been sufficiently reinforced, both the shock source and the SBR ball have noise at each frequency. Is greatly improved, especially at 63 Hz. Also, the noise level is improved by 10.3 dB (A) for the iron ball and 13.2 dB (A) for the SBR ball as compared with the first comparative example.

  In the second embodiment, a concrete board is molded with a mold as a tread, and at the same time a kick is molded. Compared to Comparative Example 1, the noise level of the iron ball is improved by 12.4 dB (A), and the SBR ball is improved by 17.1 dB (A). It is a very big improvement and a great improvement at 63 Hz.

  In Example 3, a stopper and a fixing part are made using mortar and iron pieces having a female thread cut at both ends of a hollow extruded cement board. However, there is no kick section. Again, the noise level is improved by 7.2 dB (A) for the iron ball and 11.5 dB (A) by the SBR ball, and the reduction amount of 63 Hz is large for any impact source. Compared with the first and second embodiments in which the kick-in part is integrally molded, it cannot be said that the improvement is significant.

  As described above, according to the present invention, the non-metallic inorganic material is used for the tread that should have high bending rigidity, so that the cost can be greatly reduced and the sound performance can be greatly improved and the sound performance of various staircase structures can be achieved. It can be applied to improvement.

It is a side view of the staircase structure of an example of this invention. It is a front view of the staircase structure of FIG. It is a perspective view of an example tread board used for the staircase structure of FIG. It is a perspective view of the tread of another example. (A) is sectional drawing which shows the nose part of a staircase mat of one example, (b) is sectional drawing to which the surface part of (a) was expanded. It is a perspective view of the tread of another example. It is a perspective view of the tread concerning a comparative example. (A) is sectional drawing of the step board cut | disconnected by the AA line of FIG. 7, (b) is sectional drawing of the tread board cut | disconnected by the BB line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stair structure 2 Stair girder 2A Vertical part 2B Inclined part 3 Tread board 3A Tread part 3B Kick part 3C Hollow part 3D Mortar 4 Base 5 Base member 6 Bolt 7 Iron piece which cut the female screw

Claims (6)

  A staircase structure comprising a steel stair girder and a tread board, wherein the tread board is made of a non-metallic inorganic material having a thickness of 20 to 60 mm, and both ends in the longitudinal direction of the tread board are fixed to the stair girder. A staircase structure characterized by   The staircase structure according to claim 1, wherein the tread includes a tread surface portion and a kick-in portion, and the tread has a substantially L-shaped cross section.   The said tread has a hollow part, The said hollow part is formed so that it may have an opening part in the both ends of the longitudinal direction of the said tread board, Each said opening part is sealed Stair structure.   The staircase structure as described in any one of Claims 1-3 with which the screwing fixing | fixed part is provided in the both ends of the longitudinal direction of the said tread.   The staircase structure according to any one of claims 1 to 4, wherein the stair girder has a bending rigidity equal to or greater than that of an 8 mm thick steel plate.   A stair mat is provided on the tread, the stair mat is formed of a rubber material, the stair mat is fixed on the tread through an adhesive layer, and the stair mat is on the surface. The staircase structure according to any one of claims 1 to 5, further comprising an uneven portion, wherein a fine uneven portion is formed on the protruded portion of the uneven portion.

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