JP4200239B2 - Steel stairs repair method, steel stairs - Google Patents

Description

  The present invention is an existing steel staircase that has dirt such as rust on the surface, and when renovating the staircase, the existing staircase is used to renovate the staircase by using the existing sagittal girder as it is. The present invention relates to a repair method and a steel staircase constructed by the repair method.

  The steel staircase is constructed by sandwiching both sides of a steel plate (usually about 3 to 6 mm thick) with a steel plate girder (usually about 9 to 12 mm thick). Therefore, in the step board arranged horizontally, rainwater or the like is likely to be accumulated, and the step board has a material thickness smaller than that of the sasara girder, so that corrosion is likely to proceed. Therefore, in general, even though the sasara girders can be used, only the treads are often corroded so that they cannot be used.

  In the case of remodeling such steel steps, conventionally, a tread fixed to the spar is cut on-site, the inner surface of the spar is trimmed, and a new tread is welded to the spar.

  In the case of such construction, it took time and effort to cut and remove the existing treads, and temporary construction such as a working scaffold was also required. Therefore, the construction period was long and expensive. Furthermore, when the treadle is removed, the steel stairs cannot be used during that time, especially in the case of stairs that are positioned as emergency stairs, there is a risk of hindering evacuation due to disasters, etc. .

  Conventionally, in a wooden staircase, a method and a staircase structure have been proposed in which an existing staircase is taken in as it is (Patent Documents 1 and 2). Also. There has also been proposed a renovated staircase structure that incorporates an existing staircase structure as it is, even for steel stairs (Patent Document 3).

These are methods that cover the tread using the existing tread as it is when the existing stair structure functions sufficiently structurally (when the tread is not corroded so much). No method has been proposed for safely remodeling a tread that may be unusable.
Japanese Patent Laid-Open No. 2003-262023 JP 2001-3535 A Japanese Utility Model Publication No. 62-61830

  Accordingly, an object of the present invention is to realize a method of reforming a tread without cutting and removing an existing tread that can be used and can be unusable.

  However, the present invention solves the above-mentioned problem because the existing tread is sandwiched between the upper and lower cover plates and fixed together, and at least one of the upper and lower cover plates is fixed to the further girders.

That is, this invention is a method for repairing a steel staircase, wherein the existing steel staircase is repaired in the following steps.
(1) The existing steel staircase is installed by sandwiching both ends of the existing stepboards arranged in a staircase shape with a pair of girders.
(2) Vertical through holes are drilled at a plurality of locations on the existing tread.
(3) A lower cover plate is arranged on the lower surface of the existing tread plate, and an upper cover plate is arranged on the upper surface of the existing tread plate with a soundproof substrate interposed therebetween. The upper and lower cover plates are formed with through holes that communicate with the through holes.
(4) A bolt is inserted into the through hole of the lower cover plate, the through hole of the existing tread plate, and the through hole of the upper cover plate, and the nut is screwed into the existing tread plate, the upper and lower cover plates, and the soundproofing. Fix the substrate together.
(5) At least one of the upper and lower cover plates and the spar are fixed at the contact portion.

  Further, in the above, on the upper stage side of the upper and lower cover plates, an upper cover part is formed by bending upward, and caulking is applied to the gap between both upper cover parts, and the upper cover part is placed on the upper side of the existing step board. This is a method for repairing a steel frame staircase, characterized by covering the edge of the steel frame.

Another invention is a steel step characterized by having the following configuration.
(1) In the existing steel staircase, where the existing tread is fixed by sandwiching it with the existing girder,
(2) The lower cover plate is disposed on the lower surface side of the existing tread plate, and the upper cover plate is disposed on the upper surface side with a soundproof substrate interposed therebetween,
(3) A bar that penetrates from the upper cover plate to the lower cover plate, and integrally fixes the upper and lower cover plates, the soundproof base material, and the existing tread board,
(4) Seal the upper side of the upper and lower cover plates in a watertight manner and open the lower side,
At least one of the upper and lower cover plates was fixed to an existing spar.

  The “upper side” of the step board in the above refers to a side (that is, a kicking side) located on the ascending side in the ascending / descending direction when the treads are arranged in a staircase pattern. Further, the lower side of the tread refers to the side located on the lower side (that is, the nose side).

  Since the existing tread plate and the upper and lower cover plates are fixed together and one of the upper and lower cover plates is welded to the siding girder, the upper and lower covers do not depend on the joint strength between the existing siding girder and the existing tread plate or the strength of the tread plate. It has the effect of walking with the plate as a tread.

  Therefore, when renovating, the labor and time for removing the existing treads can be saved, and efficient remodeling can be performed. In addition, since the existing treads are not removed, there is no need for a work scaffold during renovation work, and any existing staircases installed in narrow spaces, etc., are not subject to restrictions on the work location. There is an effect that can be done.

  The upper cover plate 1 is disposed on the upper surface side and the lower cover plate 11 is disposed on the lower surface side with the existing step plate 41 of the existing steel staircase 40 interposed therebetween, and the soundproof base material 24 and the cushion are disposed between the existing step plate 41 and the upper cover plate 1. A rubber 28 is interposed (FIG. 4). The soundproof base 24 is intended to attenuate the sound generated by the upper cover plate 1 during walking, and the cushion rubber 28 is intended to promote the sound attenuation action and to enhance the walking feeling during walking. To do.

  In this way, the upper cover plate 1, the soundproof base 24, the cushion rubber 28, the existing tread 41, and the lower cover plate 11, which are stacked in order from the top, are previously drilled in advance, and the through holes 9, 26, 29, and the through holes, respectively. 47, the through-hole 20 is communicated, the bolt 52 common to the through-hole 47 such as the through-hole 9 is inserted, the nut 53 is tightened, and the sandwiched upper cover plate 1, soundproof base 24, cushion The rubber 28, the existing tread plate 41 and the lower cover plate 11 are structurally fixed integrally (FIG. 4).

  In this way, the upper cover plate 1 is welded and fixed to the existing girders 50 of the existing steel steps 40 (FIG. 4 (a), welding trace 35 in FIG. 5). The upper cover plate 1 and the existing girder 50 are fixed to each other even if there is no existing tread board 41, and has a sufficient mounting strength to ensure an appropriate mounting strength for safe walking.

  The upper and lower cover plates 1 and 11 are bent on the upper side to form upper cover portions 5 and 16, respectively. The upper cover portions 5 and 16 are respectively formed with horizontal connecting portions 7 and 18 following the rising portions 6 and 17, respectively. The horizontal connecting portions 7 and 18 face each other at different heights. 32 is formed. The gap 32 is filled with a caulking material 34 to seal the upper side of the upper and lower cover plates 1 and 11 (FIG. 4A).

  In addition, the lower side of the upper and lower cover plates 1 and 11 are bent to form the drooping portions 3 and 14, and the tips 4 and 15 of the drooping portions 3 and 14 are equivalent to the lower edge 43 of the existing tread plate 41. Or it is located below. The hanging portions 3 and 14 of the upper and lower cover plates 1 and 11 are opened downward without being connected (FIG. 4A).

  When there is a gap between the existing spar 50 and the upper cover plate 1, the caulking material 34 is filled to form a tread plate 38 so as to be watertight. Similarly, all the existing treads are similarly covered with the upper and lower cover plates 1 and 11 to constitute the steel steps of the present invention (FIGS. 2 and 3).

  This steel staircase 39 is used to repair the existing steel staircase 40 so that the existing tread 41 will be in a structurally dangerous state in the near future even though the existing spar 50 has sufficient performance. Although it is most suitable, the present invention can also be applied to the case where both the existing spar 50 and the existing tread 41 are structurally sufficient.

  Embodiments of the present invention will be described with reference to the drawings.

[1] Configuration of the existing steel stairs 40

The existing steel staircase 40 is formed of a striped steel plate (checker plate) having a thickness of 4.5 mm, and the existing step plates 41 and 41 are formed of a tread surface L ₀ (L ₀ = 280 mm). It is sandwiched and fixed by welding at the contact point. On the upper side of the existing tread 41, an upper rib 42 with a height H ₁ (H ₁ = 30 mm) is formed upward, and on the lower side, a lower rib 44 with a height H ₂ (H ₂ = 30 mm) is downward. It is formed towards. Further, it is formed with a step width D (D = 900 mm) (FIGS. 4A and 4B).

  The step board 41 does not have a member corresponding to a kick board, and is a step board 41, 41 positioned above and below, and a gap 48 is formed between the upper rib 42 of the lower step board 41 and the lower rib 44 of the upper step board 41. (FIG. 3 (a), FIG. 1 (a)).

[2] Composition of members for renovating stairs

(1) Upper cover plate 1

  The upper cover plate 1 is formed of a steel plate having the same width D as the existing tread 41, and has a drooping portion 3 provided substantially vertically on the lower side of the horizontal base 2 and an upper cover 5 on the upper side. . The hanging part 3 is formed so that the lower edge 4 is positioned below the lower edge 45 of the lower rib 44 of the existing tread board 41 in the attached state. Further, the upper cover portion 5 forms a rising portion 6 substantially vertically from the horizontal base portion 2, and the front end side of the rising portion 6 is bent horizontally outward to form a horizontal connecting portion 7 (see FIG. 4 (b)).

  Further, through holes 9 are formed in the horizontal base portion 2 of the upper cover plate 1 in the center and both ends 1a, 1a side (for example, 60 mm from both ends 1a) in the width direction. It is formed on each of the upper stage side and the lower stage side, and is formed at a total of six locations.

  For the upper cover plate 1, for example, a striped steel plate having a thickness of 3.2 mm is subjected to hot dip galvanization (not shown). In this case, since the striped steel plate has a striped projection on the upper surface side, depending on the position of the through-hole 9, when a bolt is passed through the through-hole 9, the head and the projection of the bolt to be used interfere with each other. As a result, tightening may not be sufficient. Therefore, in such a case, the upper surface around the through-hole is previously flattened by cutting the projection and flattening the part where the bolt head hits, or by welding a member such as a washer. It is necessary to keep.

(2) Lower cover plate 11

  The lower cover plate 11 is formed so as not to be larger than the width D of the existing tread board (upper cover plate) 41. Normally, when the lower cover plate 11 is attached to the sheathing girder 50, the inner surface 51 of the sheathing girder 50 and both ends of the lower cover plate 11 are formed. The gaps 31 and 31 of about 5 mm are formed between the edges 12 and 12 (FIGS. 4B and 5).

  In the lower cover plate 11, a drooping portion 14 is provided substantially vertically on the lower side of the horizontal base 13 that contacts the lower surface 46 of the existing tread plate 41, and the upper cover 16 is formed on the upper side. The lower edge 15 of the hanging part 14 is formed to the same extent as the lower edge 45 of the lower rib 44 of the existing tread plate 41.

  The upper cover portion 16 of the lower cover plate 11 forms a horizontal connecting portion 18 at the upper end of the substantially vertical rising portion 17 toward the lower stage. With the lower cover plate 11 attached, the lower surface 18b of the horizontal connecting portion 18 and the upper surface 7b of the horizontal connecting portion 7 of the upper cover plate 1 are opposed to each other to form a gap 32 of about 12 mm. Form. In addition, the tip 19 of the horizontal connecting portion 18 is located in the vicinity of the rising portion 6 of the upper cover plate 1 (that is, the base end of the horizontal connecting portion 7) in a plan view (FIG. 4A). (B)).

  In addition, the lower cover plate 11 is formed with six through holes 20 and 20 communicating with the through holes 9 of the upper cover plate 1 when attached (FIG. 2).

  The lower cover plate 11 is made of, for example, a steel plate having a thickness of 2.3 mm and hot dip galvanized.

(3) Soundproof base material 24

  The soundproof base material 24 is formed so as to be located in the horizontal base portion 2 of the upper cover plate 1 and in the tread surface of the existing tread plate 41 in a plan view when attached. Thus, it is formed in a size that does not protrude from the lower cover plate 11. Further, the soundproof base 24 is normally formed such that a gap 33 of about 20 mm is formed between the inner surface 51 of the spar 50 in the step width direction when attached (FIG. 4B). ), FIG.

  In addition, when the soundproof substrate 24 is attached, the through holes 26 and 26 communicating with the through holes 9 and 20 of the upper and lower cover plates 1 and 11 are formed at six locations. Moreover, the soundproof base material 24 is comprised from the cement-type panel (flexible board) about 8 mm thick, for example.

(4) Cushion rubber 28

  The cushion rubber 28 is a member arranged corresponding to the position of the through holes 9, 20, 26 that communicate with the upper and lower cover plates 1, 11 and the soundproof base material 24, and communicates with the through holes 9, 20, 26 in the center. It is comprised from the rubber-type material which pierced the possible through-hole 29 (FIG.4 (b)).

  The cushion rubber 28 is made of neoprene rubber having a thickness of 10 mm and 80 mm × 80 mm, for example.

[3] Repair method

(1) Drill through holes 47 and 47 at the center and both ends in the width direction at predetermined positions on the existing tread board 41 (positions matched to the positions of the through holes 9, 20, and 26 of the upper and lower cover plates 1 and 11). The through-holes 47 are formed at the same positions as the through-holes 9, 20, 26, that is, at the upper and lower sides of the tread surface, and are formed at a total of six locations (FIGS. 1A and 1B). The through-hole 47 is formed so as to communicate with the upper and lower cover plates 1, 11, the through-holes 9, 20, 26, etc. such as the soundproof base material 24.

(2) Remove the corroded portion and the rusted portion of the existing tread 41 using an electric cup wire or file. Thereafter, a rust-preventing paint is applied to the existing tread board 41, and processing is performed so that new rust or the like is generated (FIG. 1 (c)).

(3) Cushion rubbers 28 and 28 are installed at a total of six locations on the upper surface 46a of the existing tread 41 so that the through holes 47 and the through holes 29 communicate with each other (FIG. 1 (d)).

(4) The soundproof base material 24 is lowered from the upper side of the existing tread board 41, and the soundproof base material 24 is cushioned so that the through hole 29 (the through hole 47 of the existing tread board 41) and the through hole 26 communicate with each other. Overlay on the rubber 28 (FIG. 1E).

(5) The upper cover plate 1 is lowered from the upper side of the soundproof base material 24, and the upper cover plate 1 is overlaid on the soundproof base material 24 so that the through holes 26 and the through holes 9 of the soundproof base material 24 communicate with each other (see FIG. 1 (f)).

(6) The horizontal base 13 of the lower cover plate 11 is placed on the lower surface 46 side of the existing tread 41 and the through hole 47 and the through hole 20 of the existing tread 41 are communicated. Simultaneously with the installation of the lower cover plate 11 or before and after the installation of the lower cover plate 11, the upper cover plate 1 communicates with the through holes 9, the through holes 26, the through holes 29, and the through holes 47 from the upper side. Thus, the shaft part of the bolt (bind screw) 52 is inserted, and the through hole 20 of the lower cover plate 11 also penetrates (FIGS. 2 and 3). A nut (cap nut) 53 is screwed and tightened to the shaft of the penetrating bolt 52, and the existing tread 47 is sandwiched between the upper and lower cover plates 1 and 11, the cushion rubber 28 and the soundproof base 24, and these are fixed integrally. . A total of six bolts 52 are used corresponding to the through holes 9 and the like. A rubber packing 54 is interposed between the head of the bolt 52 (base end of the shaft) and the upper cover plate 1 (FIG. 1 (g)).

  The bolts 52 and nuts 53 are attached and tightened because the existing tread 41 does not have a kick plate and a gap 48 is formed between the existing treads 41 and 41 positioned above and below. Since a jig can be inserted, assembly work can be facilitated.

(7) The spar 50 and the upper cover plate 1 are welded and fixed at a predetermined position (the welding position is 35 in the figure). The weld 35 is fixed to the balance beam 50 by the upper cover plate 1 alone, and is fixed with a strength that can withstand walking (FIG. 1 (h)). For example, the lower stage side of the upper cover plate 1 is welded about 70 mm on the nose side (lower stage side) of the horizontal base 2 and the entire length (about 55 mm) of the drooping part 3. Also, it is desirable to secure a welding length of about 70 mm on the upper side of the horizontal base 2 (FIGS. 4A and 5).

  This welding operation can be performed from above the upper cover plate 1 by facing downward from the upper surface side of the upper cover plate 1, and a temporary scaffold is not required.

(8) When the welding is completed, the caulking material 34 is filled and brought into close contact with the gaps 32 between the horizontal connecting portion 7 of the upper cover plate 1 and the horizontal connecting portion 18 of the lower cover plate 11. Further, the caulking material 34 is also filled and brought into close contact between the inner side surface 51 of the sheathing girder 50 and the edge 1a of the upper cover plate 1 (FIGS. 1 (i) and 5). The filling of the caulking material 34 is to prevent water from entering the soundproof base material 24 and the cushion rubber 28.

(9) As described above, the repair of the existing step board 41 (the existing steel staircase 40) for one step is completed, and a new step board 38 is formed (FIG. 1 (i)). Similarly, all the existing treads 47 and 47 are repaired to form treads 38 and 38, and the steel steps 39 of the present invention are configured together with the spar 50 and 50 (FIGS. 2 and 3).

(10) The new steel frame stair 39 walks on the upper cover plate 1 in the same manner as the conventional steel frame stair 40. At any stage during the work, the existing tread 41 is present, so there is no hindrance to walking for the time being. In particular, in the case of the outer stairs designated as special evacuation stairs, there is no problem in dealing with an emergency.

[4] Other embodiments

(1) In the above embodiment, the cushion rubber 28, the soundproof base 24, and the upper cover plate 1 are sequentially stacked on the existing tread 41, but the cushion rubber 28 and the soundproof base 24 are previously placed on the lower surface of the upper cover plate 1. 1b can be bonded together (not shown).

(2) In the above embodiment, the caulking material 34 is filled. If the soundproof base 24 and the cushion rubber 28 are made of a water-resistant material and the existing tread 41 is sufficiently rust-proofed, the caulking is provided. The material 34 can also be omitted (not shown).

(3) Moreover, in the said Example, the through-holes 9 and 20 etc. and the through-holes 47 etc. were installed in six places, and were fixed with the volt | bolt and the nut. The number (ie, the number of bolts 52) is arbitrary (not shown). However, the upper and lower cover plates 1 and 11 and the existing step board 41 must be fixed so that they can be joined together structurally and can be stably walked without causing warpage or the like in the upper cover plate 1.

(4) Further, in the above embodiment, the cushion rubber 28 and the soundproofing base material 24 are combined, so that noise generated by walking can be prevented and appropriate cushioning properties are provided during walking, so that the walking feeling is good. However, the cushion rubber 28 can be omitted (not shown).

(5) In the above embodiment, since the lower side of the upper and lower cover plates 1 and 11 is opened, even if rainwater or the like enters the tread board 38 (between the upper and lower cover plates 1 and 11). A drainage path is secured and moisture can be prevented from accumulating in the tread plate 38, but the lower side of the upper and lower cover plates 1 and 11 can also be in close contact (not shown). For example, the hanging portions 3 and 14 of the upper and lower cover plates 1 and 11 are bent and brought into contact with each other, or a caulking material is filled with a gap (not shown).

(6) In the above embodiment, the upper cover plate 1 and the counter girder 50 are welded. However, the lower cover plate 11 can be welded to the counter girder 50 (not shown). However, in this case, the thickness of the lower cover plate 11 is increased, and the welding work is performed from the lower surface side of the stairs. Therefore, a slight work scaffold is required, and the upper cover plate 1 is Work efficiency is slightly inferior compared with welding.

(7) In the above embodiment, the upper cover plate 1 is welded and fixed to the sheathing girder 50. However, instead of welding, a flange is formed on the adhesive or the upper cover plate 1, and the flange is attached to the sheathing girder 50. It is also possible to abut against the inner surface 51 and fix the spar 50 and the flange with bolts and nuts (not shown).

(A)-(i) is the schematic longitudinal cross-sectional view explaining the repair method of this invention. It is a top view of the steel frame staircase created in the Example of this invention. (A) is an expanded sectional view in the AA line of FIG. 2, (b) is an expanded sectional view in the BB line. (A) is the C section enlarged view of Fig.3 (a), (b) is an assembly drawing. It is the D section enlarged view of Drawing 3 (b).

Explanation of symbols

1 Upper cover plate 2 Horizontal base (upper cover plate)
3 Hanging part (upper cover plate)
5 Upper cover (upper cover plate)
6 Raise the upper cover (upper cover plate)
7 Horizontal connecting part of upper cover (upper cover plate)
9 Through hole (upper cover plate)
11 Lower cover plate 13 Horizontal base (lower cover plate)
14 Hanging part (lower cover plate)
16 Upper cover (lower cover plate)
17 Upper cover riser (lower cover plate)
18 Horizontal connecting part of upper cover (lower cover plate)
20 Through hole (lower cover plate)
24 Soundproof substrate 26 Through hole (soundproof substrate)
28 Cushion rubber 29 Through hole (cushion rubber)
34 Caulking material 35 Welding 38 Tread 39 Steel stair 40 Existing steel stair 41 Existing tread 42 Upper rib (existing tread)
44 Lower rib (existing tread)
47 Through hole (existing tread)
50 Sasara girder 52 Bolt 53 Nut 54 Rubber packing

Claims (3)

A method for repairing a steel stairs characterized by repairing an existing steel stairs in the following steps.
(1) The existing steel staircase is installed by sandwiching both ends of the existing stepboards arranged in a staircase shape with a pair of girders.
(2) Vertical through holes are drilled at a plurality of locations on the existing tread.
(3) A lower cover plate is arranged on the lower surface of the existing tread plate, and an upper cover plate is arranged on the upper surface of the existing tread plate with a soundproof substrate interposed therebetween. The upper and lower cover plates are formed with through holes communicating with the through holes.
(4) A bolt is inserted into the through hole of the lower cover plate, the through hole of the existing tread plate, and the through hole of the upper cover plate, and the nut is screwed into the existing tread plate, the upper and lower cover plates, and the soundproofing. Fix the substrate together.
(5) Fix at least one of the upper and lower cover plates and the counterspar with a contact portion. On the upper side of the upper and lower cover plates, it is bent upward to form an upper cover part, caulked in close contact with the gap between the upper cover parts, and the upper cover part covers the upper edge of the existing tread plate The method for repairing steel steps according to claim 1. (1) In the existing steel staircase, where the existing tread is fixed by sandwiching it with the existing girder,
(2) The lower cover plate is disposed on the lower surface side of the existing tread plate, and the upper cover plate is disposed on the upper surface side with a soundproof substrate interposed therebetween,
(3) A bar that penetrates from the upper cover plate to the lower cover plate, and integrally fixes the upper and lower cover plates, the soundproof base material, and the existing tread board,
(4) Seal the upper side of the upper and lower cover plates in a watertight manner and open the lower side,
A steel staircase, wherein at least one of the upper and lower cover plates is fixed to an existing girder.

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