JP6101136B2 - Welded side girder structure, welded steel staircase, method for manufacturing welded steel staircase - Google Patents

Description

  The present invention relates to a welded side girder structure, a welded steel staircase, and a method for manufacturing a welded steel staircase, in which a tread plate is fixed to a side girder such as a sheath girder.

  Conventionally, the stairs supported the treads by sandwiching both ends in the width direction of the treads arranged in a staircase shape between the side beams. In this case, in the case of welding, it was manufactured by the following procedure.

(1) Write a crease on the inner surface of the first sword and the second spar in accordance with the position of the end surfaces of both treads.
(2) Place the first sagittal girder on the work surface with the inner surface facing up, and temporarily fix it so that it does not move by placing the first tread on the inner surface of the sagittal girder. A fillet weld is made between the contact edge of the tread board and the inside of the spar girder to temporarily fix the first tread board.
(3) Similarly, place the second tread on the inner surface of the first sword so that it does not move in line with the markings, and fill the space between the contact edge and the inner side of the spar. Weld the meat and temporarily fix the second tread. At this time, if necessary, both the footboards are locked or fixed.
(4) In the same way, temporarily fix all the treads to the inner surface of the first counter girder.
(5) If all the tread board groups are temporarily fixed, place the second spar on the other side of the tread board group.
(6) Align the crease on the inner surface of the second sword girder with the end face of the tread board group.
(7) Fillet weld the contact edge between the end surface of the tread plate group and the inner surface of the second counter girder and temporarily fix it.
(8) After confirming that the tread plate group (all treads) and the temporary fixing of the first and second counterspars are as designed, perform the main welding and configure the steel steps.
(9) In addition, the steel staircase was completed by polishing or other treatment so that the welding marks were not noticeable, and then painting or plating the entire steel staircase.

In this process, the ruled line work accounted for about one-third of the entire process, and shortening the ruled line work led to a reduction in manufacturing time.
In addition, the task of aligning the end face of the tread board with the ruled line requires skill and is a complicated task. In particular, in the state where the first fixing girder and the tread plate group have been temporarily fixed, the work of aligning the crease position of the second sagging girder with the edge of the tread plate group is complicated and takes time.

  In order to reduce such welding and reduce welding on the inner surface side of the staircase, an invention is provided in which a mounting hole is provided in the sheathing girder and the edge of the tread plate is penetrated to the outer surface of the sheathing girder to perform welding work on the outer surface side Has been proposed (Patent Document 1). Moreover, the invention which fixes the shock absorbing material which receives a tread board in advance to the inner surface of a stool and receives the tread board with a shock absorbing material is also proposed (Patent Document 2). There has also been proposed an invention in which a through hole is provided in a sheathing girder without using welding, a screw hole is provided in a treading plate, and bolts are used from the outer surface side of the shearing girder to fix the treading plate (Patent Literature). 3).

JP-A-6-322918 JP 2003-336367 A JP 2005-213896

In the conventional case, in Patent Document 1, the edge of the tread plate must be inserted into the mounting hole, and the work is not easy when the thickness of the tread plate is large (when the width of the tread plate is large). It was.
Moreover, in the case of patent document 2, when fixing a shock absorbing material to the inner surface of a tread board, ruled writing and welding work were required, and the complexity of the work was the same. In Patent Document 3, since bolts are used, the complexity of welding is eliminated, but the heads of the bolts are exposed on the outer surface side of the spar.

  In the present invention, in the steel staircase having a structure in which the spar and the step board are fixed only by welding without forming a through-hole in the spar and using a bolt that exposes the head on the outer side of the spar. The purpose is to simplify the scoring work and improve the assembly work in terms of safety and time.

  Therefore, in the present invention, a structure of a passage including a staircase in which a side girder such as a saddle girder and a tread plate are fixed by welding alone without using a bolt, and a mounting hole that does not penetrate the sagging girder is provided, Since the protrusions provided on the base plate are inserted and welded, ruled writing is not required or simplified, the positioning work in the assembly work is facilitated, and the safety of the work is ensured to solve the above problems.

That is, according to the first aspect of the present invention, one or both of the end surfaces in the width direction of the tread plate group arranged in parallel in a straight line or a curved line are applied to the inner surface of the steel side beam, and the side beam And a welding passage structure in which the tread plate is fixed by welding and configured as follows.
(1) the thickness of said side girder and t _2.
(2) A steel guide projection having a length L ₁ (L ₁ <t ₂ ) is formed toward the side beam so as to be able to contact the contact end surface of the tread plate group.
(3) A mounting hole corresponding to the guide protrusion is formed on the inner surface of the side beam with a depth L _{2 (} L ₁ <L ₂ <t ₂ ).
(4) Insert a guide projection of the tread plate group into the mounting hole of the side girder and weld it in the connecting hole or around the guide projection to fix the guide projection of the tread plate and the side girder in the mounting hole. .

Further, in the second invention, one or both of the end surfaces in the width direction of the steel treads arranged in a step shape are applied to the inner surface of the steel spar, and the spar and the above It is a staircase in which a tread board is fixed by welding, and is a welded steel staircase characterized in that it is configured as follows.
(1) the thickness of the sasara digits and t _2.
(2) A steel guide projection having a length L ₁ (L ₁ <t ₂ ) is formed toward the further spar so as to be able to contact the contact end surface of the tread plate.
(3) A mounting hole corresponding to the guide protrusion is formed on the inner surface of the sheathing girder with a depth L ₂ (L ₁ <L ₂ <t ₂ ).
(4) Insert the guide projection of the tread plate into the mounting hole of the sheathing girder and weld it in the mounting hole or around the guide projection to fix the guide projection of the tread plate and the sheathing girder in the connecting hole. .

Further, the third invention sandwiches both end surfaces in the width direction of the steel treads arranged stepwise between the inner surfaces of the parallel steel girder beams , and welds the inner surface of the treadle beam and the tread plate by welding. A method of manufacturing a welded steel staircase, characterized by being fixed and configured as follows.
(1) The other side of the guide projection with one side facing the girder side is fixed to both end faces of the tread plate. The guide protrusion is a boundary between one side and the other side, as a reference surface to position the end faces of the footboard, the other side of the guide protrusion, the length L ₁ toward the sasara digit side from the reference plane Only protruding.
(2) the sasara digit has a thickness of _{t 2,} wherein the sasara digits of the inner surface, to form a mounting hole corresponding to the guide projection at a depth _{L 2 (L 1 <L 2} <t 2), structure To do .
(3) Subsequently, one of sasara digit, placed to the work location by an inner side up.
(4) Subsequently, the footboard, the said mounting hole of one of sasara digits, while plug the one side of the guide projections, are arranged at one end to the stepped face down, and shape retention, temporarily fixed to footplate A group.
(5) Subsequently, the other spar is placed on the other end of the tread plate group with the inner surface facing down, and the guide protrusions of each tread plate are inserted into the mounting holes of the other spar, both sasara digits and treads group and shape retention, such that the guide protrusions can not be pulled out from the mounting hole, the temporarily fixed.
(6) Subsequently, the tread plate group and the inner surface of the sheathing girder are welded together to form a welded steel staircase by uniting both the treading girders and the treading plate group.

According to a fourth aspect of the present invention, both end surfaces in the width direction of the steel tread plates arranged in a step shape are sandwiched between the inner surfaces of the parallel steel girder girders , and the inner surface of the girder and the tread plate are welded. A method of manufacturing a welded steel staircase, characterized by being fixed and configured as follows.
(1) A guide projection is formed such that one side faces the further girder side and the other side faces the tread plate side. The guide protrusion is a boundary between one side and the other side, as a reference surface to position the end surfaces of the footplate to the other side and a length L ₁ from the reference plane.
(2) the sasara digit has a thickness of _{t 2,} wherein the sasara digits of the inner surface, to form a mounting hole corresponding to the guide projection at a depth _{L 2 (L 1 <L 2} <t 2), structure To do .
(3) The reference surface of the guide protrusion is aligned with the inner surface of the sheathing girder, one side is inserted into the mounting hole and fixed, and the other side of the guide protrusion protrudes from the inner surface of the tread plate.
(4) Next, place one of the spar girders on the work place with the inner surface facing up.
(5) Subsequently, with the one end of the tread plate facing down, the other side of the guide projection protruding from the connecting hole of the one counter girder is placed in contact with the tread plate, held in shape, and temporarily fixed. And the tread board group.
(6) Subsequently, the other sagittal girder is placed on the other end of the tread plate group with the inner surface facing down, and the tread plate is abutted against the other side of the guide projection protruding from the connection hole. Make contact with each other and shape the two spar girders and the tread board group, and fix them temporarily.
(7) Subsequently, the tread plate group and the inner surface of the sheathing girder are welded together to form a welded steel staircase by integrating both the treading girder and the tread plate group.

Moreover, although the passage in the above is suitable for a staircase that moves with a step in the vertical direction and the horizontal direction, it can also be applied to a slope without a step or a flat passage that moves only in horizontal movement without moving in the vertical direction.
In addition, the treads described above are both used when the treads are arranged side by side in a horizontal manner, or when the treads are arranged in a staircase with different heights.
The staircase described above also includes a straight staircase structure in which both sides of a group of treads arranged stepwise are sandwiched by further girders, and a spiral staircase in which side girders are arranged only on one side of the stairs.

Since a mounting hole that does not penetrate through the spar is installed and a projection provided on the tread plate is inserted and welded, the crease work is greatly reduced or the crease work is not required. Alignment can be done very easily. In addition, since many ruled lines were relied on by hand, human errors such as mistakes in ruled lines can be reduced. In addition, since the ruled line work is usually tightened by about one third, depending on the staircase structure and the width of the staircase, for example, if it is an assembly work that is related to 3 hours, the work time can be reduced to about 2 hours. .
Further, since the mounting hole does not penetrate the outer surface side of the side beam compared to the fixed staircase by the bolt, the head portion of the bolt is not exposed, so that the outer surface of the side beam can be freely exposed.

1A and 1B are treads used in the practice of the present invention. FIG. 1A is a left side view, FIG. 1B is a front view, FIG. 1C is an AA enlarged sectional view, and FIG. FIGS. 2A and 2B are spar girders used in the practice of the present invention. FIG. 2A is a front view, and FIG. 3A and 3B are steel steps according to the present invention, in which FIG. 3A is a plan view and FIG. FIG. 4 is an enlarged view of a portion D in FIG. FIG. 5A is an enlarged view of an E portion in FIG. 3A, and FIG. 5B is a perspective view of the (a) portion. FIG. 6 is a perspective view for explaining the first manufacturing method in the steel step of the present invention. FIGS. 7A to 7F are longitudinal sectional views of other treads of the steel step of the present invention. FIGS. 8A to 8F are longitudinal sectional views of other treads of the steel step of the present invention. FIGS. 9A to 9E are longitudinal sectional views of other treads of the steel step of the present invention. 10A and 10B show guide protrusions, FIG. 10A shows an example using a cylindrical bar, FIG. 10B shows an example using a hitting rivet before fixing, and FIG. 10C shows the same after fixing.

  An embodiment of the present invention applied to a linear steel staircase will be described based on the drawings.

1. Configuration of tread board 1

(1) footplate 1 is inclined slightly distal edge 2b side is perpendicular to the horizontal plate 2 base end edge 2a of the width D ₁ (end of ascending side), and continuously provided to the lower edge of the rising plate 6 , And formed into an integral substantially L-shape. Slightly below the upper end 6a at the outer surface 7 of the rising plate 6, the both end portions in the width _{D 1} direction, by fixing a circular rod 21, the guide projection 20 (FIG. 1, FIG. 10 (a)).

(2) The base end portion (the other side 20c of the guide projection 20) of the columnar bar 21 is brought into contact with the outer surface of the rising plate 6, and each of the contacted surfaces is fixed by welding. (One side of the guide projection 20 20b) distal end of the cylinder rod 21 are allowed to protrude by a length L ₁ from the width direction of the side edges 8,8a of raising plate 6 up. Further, at the guide protrusion 20 (circular bar 21), the boundary between the one side 20b and the other side 20c, that is, the position of the side edges 8 and 8a in the width direction of the rising plate 6 (the inner surface 11 of the saddle beam 10 described later) The same as the position) is defined as a reference plane 20a (FIG. 1). If the position of the reference surface 20a is displayed in advance, the work of fixing the columnar bar 21 to the footboard 1 can be simplified. Further, in other words, when the amount of projection of the width direction of the side edge guide protrusions from 8,8a 20 launch plate 6 is a length L _1, the guide protrusions 20 corresponding to the position of the side edges 8,8a The position becomes the reference plane 20a (FIG. 10A).
The columnar bar 21 is arranged at a position where the upper surface 4 of the horizontal plate 2 of the upper floor plate 1 (in the vicinity of the front edge 2b of the horizontal plate 2) can come into contact.
(3) In addition, the footboard 1, forms a mortar board 32 of a height _{H 1} (thickness _{H 1)} on the upper surface 4 of the horizontal plate 2 (FIG. 1 (c)).

2. Sasara Girder 10

(1) sasara digit 10 is made of a steel plate having a thickness of _{t 2,} on both sides of the oblique portion 12 and the oblique portions 12 sandwiching the footplate 1,1, a shape that each continuously provided the horizontal portion 13, 13 for landing ing.
The inner surface 11 of sasara digits 10, in accordance with the position of the guide projections 20, 20 of the footboard 1, to form a mounting hole 15, 15 of the depth _{L 2} from the inner surface 11 (FIG. 2).
Also,
Depth L ₂ of mounting hole 15 <thickness t _{2 of} sagging girder 1
And the mounting hole 15 does not penetrate (FIG. 2B). The diameter of the mounting hole 15 is slightly larger than the diameter of the columnar bar 21 (guide protrusion 20) so that it can be freely inserted and removed when the guide protrusion 20 is inserted.

(2) Further, sasara digit 10 the first sasara digit 10A, so that two pair of second sasara digit 10B, formed symmetrically, usually, from a large steel plate having a thickness of _{t 2,} sasara digit 10A The outer shape of 10B is cut out by a cutting machine such as plasma or laser, and before and after the cutting operation, the mounting holes 15, 15 are formed by drilling operation such as a drill.
In this case, the cutting work of the spar 10A, 10B and the drilling of the mounting holes 15 and 15 can be performed from the steel plate with any conventional device, and the cutting work and the drilling work can be performed simultaneously. .

3. Manufacturing process of steel stairs 30

(1) The first counter girder 10A is placed on the work place with the inner surface 11 facing up. At this time, the cylindrical rods 22, 22 are inserted into the mounting holes 15, 15 of the horizontal portion 13 of the counter girder 10A, 10B in advance. Are attached and welded (FIG. 5).

(2) Then, it arranges in the step shape with the side edges 3 and 8 of the tread board 1 facing down on the inner surface 11 of the first counter girder 10A. At this time, the guide protrusions 20 of the respective treads 1 are arranged at predetermined positions while being inserted into the mounting holes 15 of the corresponding first counter girder 10A (FIG. 10 (a)), and the inner surface 11 of the first counter girder 10A. The side edges 3 and 8 of the tread board 1 are temporarily welded so as not to move.

(3) Similarly, all the treads 1 and 1 are temporarily welded. In this case, as a starting point to insert the guide projections 20 into the mounting hole 15, facilitating the footplate 1 it can be placed in a predetermined position, the alignment of the upper and lower treads 1,1 may very easily.
In this case, the front edge 2b of the horizontal plate 2 of the step board 1 positioned at the upper stage is in contact with the outer surface 7 of the rising plate 6 of the step board 1 positioned at the lower stage, and the horizontal plate 2 of the step board 1 positioned at the upper stage. The upper surface 4 abuts on the lower side 20b (the base end portion of the columnar bar 21) of the guide projection 20 of the footboard 1 located in the lower stage (FIG. 4).
Further, at this time, the contact edge is welded between the leading edge 2 b of the horizontal plate 2 and the rising plate 6 with the step plates 1, 1 adjacent in the vertical direction.
Further, the footboards 1 and 1 are combined to form a footboard group.

(4) Subsequently, the second counter girder 10B is overlapped on the side edges 3a, 8a of the tread plate 1 facing upward with the inner surface 11 facing downward (FIG. 6), and the mounting holes 15 of the second counter girder 10B. , 15, the guide protrusions 20, 20 of the respective footboards 1, 1 are inserted. With the state in which the guide protrusions 20 of the respective tread plates 1 and 1 are inserted into the mounting holes 15 and 15 of the second counter girder 10B, the second counter girder 10B and the tread plates 1 and 1 are arranged at predetermined positions. Therefore, the inner surface 11 of the first sheathing girder 10B and the side edges 3a and 8a of the tread plate 1 are temporarily welded so as not to move.

(5) Subsequently, at least the first second sagittal girders 10A and 10B that are shaped and do not move and the tread plate group (the tread plates 1 and 1) are subjected to main welding and fixed integrally. .

(6) Subsequently, landing plates 17 and 17 are arranged on the horizontal portions 13 and 13 of the spar girders 10A and 10B, and the cylindrical bar 22 is brought into contact with the upper surface 18 of the landing plate 17 so as to contact the cylindrical bar 22 and the landing. The landing plate 17 is fixed to the inner surface 11 of the horizontal portion 13 of the girder 10A, 10B by welding the upper surface 18 of the plate 17.

(7) The steel staircase 30 is configured as described above (FIG. 3). The steel staircase 30 is used by being fixed to a building frame in the same manner as a normal steel staircase.
At this time, the top surface 4 of the horizontal plate 2 of each footboard 1 is filled with mortar up to a thickness H ₁ to form a mortar board 32, and the top surface of the landing board 1 is filled with mortar to form a mortar board 33. (FIG. 4). At this time, since the guide protrusion 20 (cylindrical bar 21) is in contact with the upper surface 4 of the horizontal plate 2, the guide protrusion 20 (column) is positioned below the upper end 6a of the rising plate 6 of the footboard 1 positioned below. Since the bar 21) is embedded in the mortar board 33 (FIG. 4), it is not visible from the outer periphery of the steel step 30.

4). Manufacturing method of other steel steps

(1) In the manufacturing method, after the cylindrical bar members 22 and 22 are inserted into the mounting holes 15 and 15 of the horizontal portions 13 and 13 of the spar 10A and 10B, the tread plates 1 and 1 are attached. After installing. Alternatively, the cylindrical rods 22 and 22 can be inserted into the mounting holes 15 and 15 of the horizontal portions 13 and 13 of the saddle beams 10A and 10B simultaneously with the mounting operation of the footboards 1 and 1.

(2) In the above manufacturing method, the tread plate 1 is provisionally welded one by one to the spar 10A, but the guide protrusions 20 and 20 of all the tread plates 1 and 1 are inserted into the mounting holes 15 and 15 and arranged stepwise. After that, temporary welding can be performed collectively.

(3) Further, in the manufacturing method, after the treads 1 and 1 are temporarily welded to the spar 10A, the spar 10B is overlapped and temporarily welded. Insert all the guide protrusions 20 into the holes 15 and 15, and hold the shape by tightening with a wire or the like between the first counterspar 10 G and the second counterspar 10 </ b> B. You can also

5. Other embodiments

(1) In the above embodiment, the connecting bar 22 is inserted into the mounting hole 15 and welded in advance in the horizontal portion 13 of the spar 10, but similarly to the oblique portion 12, the landing bar 17 is previously connected to the cylindrical bar. The guide protrusions 20 and 20 can be formed by welding 22 and 22, and the guide protrusion 20 can be inserted into the mounting hole 15 (not shown).

(2) Moreover, in the said embodiment, although the horizontal parts 13 and 13 were formed in the balance girder 10, one or both the horizontal parts 13 can also be abbreviate | omitted (not shown).

(3) In the above-described embodiment, the guide protrusion 20 is constituted by the columnar bars 21 and 22. However, a triangular or square prismatic bar, a deformed reinforcing bar, a round pipe, a square pipe, or the like can also be used ( Not shown).

(4) Further, in the above-described embodiment, the outer surface 7 of the rising plate 6 of the tread plate 1 is fixed slightly below the upper end 6a (FIGS. 1 and 7 (a)). In addition, the circular bar 21 can be used for positioning the upper and lower treads. However, if the positioning with the spar 10 is easy, the circular bar 21 may be arranged at another position of the treads 1. (FIGS. 7B to 7F).
For example, an intermediate position on the upper surface 4 of the horizontal plate 2 (FIG. 7B), a position near the tip 2b on the upper surface 4 of the horizontal plate 2 (FIG. 7C), and a proximal side 2a on the upper surface 4 of the horizontal plate 2. Two locations near the tip side 2b (Fig. 7 (d), two locations near the top end 6a on the outer surface 7 of the rising plate 6 and two points near the tip side 2b on the top surface 4 of the horizontal plate 2 (Fig. 7 (e )), In the vicinity of the upper end 6a on the outer surface 7 of the rising plate 6 and in the middle position on the upper surface 4 of the horizontal plate 2 (FIG. 7 (e)).

(5) In the above-described embodiment, the front end 2b of the horizontal plate 2 of the tread plate 1 is cut off. However, the upper bent piece 24 can be formed by bending upward as a partition piece for forming the mortar board 32. (FIG. 8). Figure 8 (b) ~ (f) the above example that the bent piece 24 adapted to the height _{H 1} of the mortar board 32, FIG. 8 (a) the height _{H 1} of the mortar board 32 the height of the upper bending piece 24 This is an example of a smaller size.
In this case, the height of the upper bent piece 24 is formed smaller than the height H ₁ of the mortar board 32, it is possible to fix the circular bar 21 in the vicinity of the upper end 6a at the outer surface 7 of the launch plate 6 treads 1 Sakiru (Figure 8 (a)).
Further, the upper bent piece 24 is adjusted to the height H1 of the mortar board 32, and _one circular bar 21 is placed at an intermediate position on the upper surface 4 of the horizontal plate 2 (FIG. 8B), and the circular bar 21 is set to the horizontal plate 2. One on the top side 2b (upper bent piece 24 side) of the upper surface 4 (FIG. 8C), and the circular bar 21 is placed on the upper side of the horizontal plate 2 on the base side 2a and the tip side 2b (upper bent piece 24 side). ) In two places (FIG. 8D), the circular bar 21 is positioned in the vicinity of the upper end 6a on the outer surface 7 of the rising plate 6 of the stepping plate 1 and on the tip side 2b (upper bent piece 24 side) on the upper surface 4 of the horizontal plate 2. 2 (FIG. 8 (e)), the circular bar 21 is located at two locations (FIG. 8 (e) near the upper end 6a on the outer surface 7 of the rising plate 6 of the tread plate 1 and in the middle position on the upper surface 4 of the horizontal plate 2). )) Or the like.

(6) Moreover, in the said embodiment, although it was set as the structure which forms the mortar board 32 in the upper surface of the horizontal board 2 of the foot board 1, it is set as the structure of the foot board 1 which does not form the mortar board 32 using a checker steel plate etc. (Fig. 9).
For example, the lower bent piece 25 may be formed by bending the front end side 2b of the horizontal plate 2 downward (FIGS. 9A to 9D). In this case, the circular bar 21 is fixed to the vicinity of the upper end 6a at the outer surface 7 of the rising plate 6 of the stepping plate 1 (FIG. 9A), and the tip side 2b (the lower bent piece 24) at the lower surface 4a of the horizontal plate 2. (Fig. 9 (b)), fixed to the inner surface side of the lower bent piece 24, away from the lower surface 4a of the horizontal plate 2 (Fig. 9 (c)), and the rising plate 6 of the tread plate 1 The outer surface 7 can be fixed in the vicinity of the upper end 6a and the lower surface 4a of the horizontal plate 2 at two positions on the tip side 2b (the inner surface side of the lower bent piece 24) (FIG. 9D).
Further, in the foot board 1, the rising board 6 can be omitted, and only the horizontal board 2 can be formed, and the lower bent pieces 25 and 25 can be formed on both edges 2a and 2b of the horizontal board 2 (FIG. 9 (e)). . In this case, the circular bar 21 can be fixed to the lower surface 4a of the horizontal plate 2 at two locations on the base end side 2a (the inner surface of the lower bent piece 25) and the distal end side 2b (the inner surface of the lower bent piece 25).

(7) Moreover, in the said embodiment, one sagging girder 10B or 10A can also be abbreviate | omitted (not shown).

(8) Moreover, in the said embodiment, although applied to the straight-advancing type staircase, it is applicable also to the surrounding staircase which attaches a fan-shaped step board around a support | pillar (not shown). In this case, since the center side of the fan-shaped step board is fixed to the support column, the spar is placed only on the outer peripheral side.

(9) Moreover, in the said embodiment, although it applied to the staircase, if the structure of the horizontal part 12 and the landing board 17 of the said spar girder is made independent, it can be applied also to the slope which does not have a level | step difference, and the path | route which moves only horizontally. .

6). Other practical aspects of fixing the guide protrusion to the sasara girder

  In the embodiment, the guide protrusion 20 is fixed to the tread plate 1 in advance as a circular bar or the like. However, the guide protrusion 20 can also be fixed to the mounting holes 15 and 15 of the spar 10. In this case, a so-called hitting rivet is used as the guide protrusion 20. Usually, the hitting rivet is used as a rivet by opening the tip portion through the fixing hole when fixing the stacked plates with the fixing holes communicating with each other.

(1) The knocking rivet 41 used as the guide protrusion 40 has an insertion portion 43 having a length L _{1 connected} to the flat lower surface side of the seat portion 42, and a hollow insertion hole 44 extending from the seat portion 42 to the insertion portion 43. Is formed. Further, slits are formed radially from the insertion hole 44 on the distal end side of the insertion portion 43, and the distal end side of the insertion portion 43 is formed to be easily opened radially (FIG. 10B).
Similar to the previous embodiment, the sasara digit 10 of thickness _{t 2,} drilling mounting holes 15 and 15 of the depth _{L 2 (see L 1 <L 2 <t 2} . Figure 2). However, the positions of the mounting holes 15, 15 on the inner surface 11 of the spar 10 are determined by the position on the tread plate 1 where the guide protrusion 40 is applied.

(2) The insertion portion 43 of the hitting rivet 41 is inserted into the mounting hole 15, and the lower surface of the seat portion 42 is brought into close contact with the inner surface 11 of the spar 10 (FIG. 10B). In this state, the insertion portion 43 is formed with a slightly smaller diameter than the attachment hole 15, and the tip of the insertion portion 43 does not reach the bottom of the attachment hole 15 (L ₁ <L ₂ ). Subsequently, the push pin 45 is inserted from the insertion hole 44 of the seat portion 42, the distal end side of the insertion portion 43 is radially opened, and the distal end side of the insertion portion 43 is pressed against the wall of the attachment hole 15. The hitting rivet 41 is fixed (FIG. 10C).
Therefore, the diameter of the mounting hole 15 is set to a diameter that prevents the insertion portion 43 from being opened and removed while the push pin 45 is inserted.
Further, in this state, the hitting rivet 41 constitutes the guide protrusion 40, the lower surface of the seat portion 42 constitutes the reference surface 10a, the insertion portion 43 constitutes one side 40b, and the portions other than the lower surface of the seat portion 42 constitute the other side 40c (see FIG. 10 (c)).

(3) Subsequently, in the same manner as in the above-described embodiment, at the work place, the first spar 10A with the guide protrusions 40, 40 fixed is placed with the inner surface 11 facing upward, and the treads 1, 1 are connected to the side edges 3 respectively. , 8 down, lined up in steps. At this time, since the step board 1 can be applied to the other side 40c of the guide protrusion 40 (that is, the outer periphery of the seat portion 42) and the step boards 1, 1 can be arranged as a guide, no marking is required (or for confirmation, (There may be a minimum ruled line).
Further, in this embodiment, it is desirable to perform positioning with respect to one tread board 1 with at least two guide protrusions 40, 40 (see FIGS. 7D, 7E, and 8F, FIG. 8D). e) Refer to (f), refer to FIGS. 9D and 9E). In the above embodiment, the outer periphery of the columnar bar 21 (guide protrusion 20) having the same diameter as or slightly smaller than the mounting hole 15 is fixed to the outer surface of the tread plate 1. In this embodiment, the outer diameter of the mounting hole 15 is larger than that of the mounting hole 15. Since the outer periphery of the seat portion 42 of the large hitting rivet 41 is fixed to the outer surface of the tread board 1, even when the same tread board 1 is used, the arrangement of the mounting holes 15, 15 is different.
In a state where the position is determined, the tread plate 1 and the inner surface 11 of the first counter girder 10A are welded sequentially. Welding is the same as in the above embodiment.

  Subsequently, in the same manner as in the above embodiment, the second counter beam 10B is overlapped on the side edges 3a and 8a of the tread plate 1 facing upward with the inner surface 11 facing downward (see FIG. 6). The tread plates 1 and 1 are brought into contact with the guide protrusions 40 and 40 in the mounting holes 15 and 15 of the 10B, and the second sheathing girder 10B is adjusted to a predetermined position. Similarly, the inner surface 11 of the first counter girder 10B and the side edges 3a, 8a of the tread plate 1 are temporarily welded so as not to move.

  Subsequently, as in the above-described embodiment, at least the first second spar 10A, 10B and the tread plate group (tread plates 1, 1) that are shaped and do not move are subjected to main welding as an easy-to-weld posture. Fix it together.

DESCRIPTION OF SYMBOLS 1 Tread plate 2 Horizontal plate 2a of foot plate Base edge 2b of horizontal plate 2b Tip end 3 of horizontal plate 3, 3a Side edge of horizontal plate
4 Upper surface 4a of the horizontal plate 6 Lower surface of the horizontal plate 6 Rising plate 7 Treading plate outer surface 7a Rising plate inner surface 8, 8a Side edge of the rising plate (width direction)
10 Sasara Girder 10A First Sasara Girder 10B Second Sasara Girder 11 Sasara Girder Inner Surface 11a Sasara Girder Outer Surface 12 Sagara Girder Angle 13 Sagara Girder Horizontal 15 Sagara Girder Mounting Hole 17 Landing Plate (Tread)
18 Upper surface 20 of landing plate Guide protrusion 20a Reference surface 20b of guide protrusion Reference surface 20c of guide protrusion Reference surface 21 of guide protrusion Cylindrical bar (stepping board side)
22 Cylindrical bar (Landing board side)
24 Upper bent piece of horizontal plate 25 Lower bent piece 30 of horizontal plate 30 Steel staircases 32 and 33 Mortar board 40 Guide projection 40a Guide projection reference surface 40b Guide projection reference surface 40c Guide projection reference surface 41 Swapping rivet 42 Seat 43 Swapping rivet insertion section 44 Tap rivet insertion hole 45 Tap of rivet push pin

Claims (4)

One or both of the end faces in the width direction of the tread group arranged in parallel with each other in a straight line or a curved line are brought into contact with the inner surface of the steel side girder, and the side girder and the tread board are fixed by welding. A welded passage structure characterized by being configured as follows.
(1) the thickness of said side girder and t _2.
(2) A steel guide projection having a length L ₁ (L ₁ <t ₂ ) is formed toward the side beam so as to be able to contact the contact end surface of the tread plate group.
(3) A mounting hole corresponding to the guide protrusion is formed on the inner surface of the side beam with a depth L _{2 (} L ₁ <L ₂ <t ₂ ).
(4) Insert a guide projection of the tread plate group into the mounting hole of the side girder and weld it in the connecting hole or around the guide projection to fix the guide projection of the tread plate and the side girder in the mounting hole. . Stairs in which one or both abutment end faces of the steel treads arranged in a staircase shape are contacted with the inner surface of the steel girder and the girder and tread are fixed by welding. However, a welded steel staircase having the following configuration.
(1) the thickness of the sasara digits and t _2.
(2) A steel guide projection having a length L ₁ (L ₁ <t ₂ ) is formed toward the further spar so as to be able to contact the contact end surface of the tread plate.
(3) A mounting hole corresponding to the guide protrusion is formed on the inner surface of the sheathing girder with a depth L ₂ (L ₁ <L ₂ <t ₂ ).
(4) Insert the guide projection of the tread plate into the mounting hole of the sheathing girder and weld it in the mounting hole or around the guide projection to fix the guide projection of the tread plate and the sheathing girder in the connecting hole. . Between the inner surfaces of the parallel steel spar girders, the both ends in the width direction of the steel treads arranged stepwise are sandwiched, and the inner surfaces of the spar girders and the treads are fixed by welding, as follows: A method of manufacturing a welded steel staircase, characterized by comprising:
(1) The other side of the guide projection with one side facing the girder side is fixed to both end faces of the tread plate. The guide protrusion is a boundary between one side and the other side, as a reference surface to position the end faces of the footboard, the other side of the guide protrusion, the length L ₁ toward the sasara digit side from the reference plane Only protruding.
(2) the sasara digit has a thickness of _{t 2,} wherein the sasara digits of the inner surface, to form a mounting hole corresponding to the guide projection at a depth _{L 2 (L 1 <L 2} <t 2), structure To do .
(3) Subsequently, one of sasara digit, placed to the work location by an inner side up.
(4) Subsequently, the footboard, the said mounting hole of one of sasara digits, while plug the one side of the guide projections, are arranged at one end to the stepped face down, and shape retention, temporarily fixed to footplate A group.
(5) Subsequently, the other spar is placed on the other end of the tread plate group with the inner surface facing down, and the guide protrusions of each tread plate are inserted into the mounting holes of the other spar, both sasara digits and treads group and shape retention, such that the guide protrusions can not be pulled out from the mounting hole, the temporarily fixed.
(6) Subsequently, the tread plate group and the inner surface of the sheathing girder are welded together to form a welded steel staircase by uniting both the treading girders and the treading plate group. Between the inner surfaces of the parallel steel spar girders, the both ends in the width direction of the steel treads arranged stepwise are sandwiched, and the inner surfaces of the spar girders and the treads are fixed by welding, as follows: A method of manufacturing a welded steel staircase, characterized by comprising:
(1) A guide projection is formed such that one side faces the further girder side and the other side faces the tread plate side. The guide protrusion is a boundary between one side and the other side, as a reference surface to position the end surfaces of the footplate to the other side and a length L ₁ from the reference plane.
(2) the sasara digit has a thickness of _{t 2,} wherein the sasara digits of the inner surface, to form a mounting hole corresponding to the guide projection at a depth _{L 2 (L 1 <L 2} <t 2), structure To do .
(3) The reference surface of the guide protrusion is aligned with the inner surface of the sheathing girder, one side is inserted into the mounting hole and fixed, and the other side of the guide protrusion protrudes from the inner surface of the tread plate.
(4) Next, place one of the spar girders on the work place with the inner surface facing up.
(5) Subsequently, with the one end of the tread plate facing down, the other side of the guide projection protruding from the connecting hole of the one counter girder is placed in contact with the tread plate, held in shape, and temporarily fixed. And the tread board group.
(6) Subsequently, the other sagittal girder is placed on the other end of the tread plate group with the inner surface facing down, and the tread plate is abutted against the other side of the guide projection protruding from the connection hole. Make contact with each other and shape the two spar girders and the tread board group, and fix them temporarily.
(7) Subsequently, the tread plate group and the inner surface of the sheathing girder are welded together to form a welded steel staircase by integrating both the treading girder and the tread plate group.

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