JPH052734Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a framework scaffolding staircase that is temporarily installed at construction sites, civil engineering sites, etc.

[Conventional technology]

As shown in FIG. 9, such a framework scaffold is constructed by extending a cloth board 26 over a gate-shaped building frame 24 whose lower end is supported by a jack base 23 or a framework base, and locking the end between the building frames 24. It is connected and fixed with cross braces 25, and the building frame 24 is connected upward with pins or arm locks and raised.

The cloth board 26 serves as a walking path and a work floor,
In order to go up to this cloth board 26, a staircase 27 is provided on the way.

This staircase has treads fixed to the girders at intervals. Conventionally, as shown in Figs. 10 and 11, steel hollow tubes were used as the girders 21, and steel In most cases, the footboard 22 is welded.

[Problem that the invention attempts to solve]

However, in the method of fixing the tread plate 22 to the girder material 21 by welding, since the girder material 21 is a pipe, sufficient welding points cannot be secured, and it requires time and skill to perform sufficient welding. .

On the other hand, as shown in FIG. 12, there is also a method of fixing the tread plate 22 to the girder 21 using clamps 28 without welding, and the tread plate 22 can be easily fixed.
With such means, the clamp may shift during use, causing looseness, which poses problems in terms of strength.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide a staircase for a metal frame scaffold which is easy to assemble and is sufficiently reliable in terms of strength.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a framework scaffolding staircase in which a tread is fixed between two parallel girder members via a support member, and the support member is fixed on the short side (the upper and lower sides) and the long side (the left and right sides). Formed from a long and thin hollow member having a parallelogram cross section with sides, of the joining angles between the short side and the long side, which have two types, obtuse angle and acute angle, the upper surface of the short side that will be the attachment part to the tread; The acute angle formed by the back or front of the long side, which is the attachment part to the girder, is formed to be equal to the angle between the girder and the tread, and the end of the back or front of the support is on the left and right sides of the tread. The gist is to cut the end diagonally so that it is exposed from the end, and use this part as a work space for fixing to the girder.

[Effect]

According to the present invention, when a tread plate is installed between two parallel girder members via a receiving material, the ends of the receiving material are cut diagonally so that they are exposed from the left and right ends of the tread board when the supporting material is attached to the girder material. Since this part can be used as a work space for fixing to the girder, the installation work can be done easily and reliably. After installation, it is firmly fixed to the girder material by the long side part, and
This support material ensures the required mounting angle of the tread with respect to the girder material, so sufficient supporting force is obtained, and
Since the receiving material is a hollow material in the shape of an elongated parallelogram, it is lightweight and has sufficient strength to withstand the load from the tread.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 is a side view showing an embodiment of the metal frame scaffolding staircase of the present invention, and Figure 2 is a perspective view of the same.
1 is a girder material constituting the metal frame scaffolding staircase of the present invention, 2 is a tread, 3 is a receiving material, 4 is a gripping fitting for the building frame, and the girder material 1 is an extruded shape of lightweight metal such as aluminum. As an example, as shown in the front view of FIG. 3, wide flanges 5a, 5 are provided at both upper and lower ends.
It has a substantially U-shaped cross section with the portions b facing each other in the longitudinal direction and protruding from each other.

The footboard 2 is also made of an extruded shape of lightweight metal such as aluminum, and has a hollow projecting wall 6 at the front end of the back side and an engaging rib 7 near the rear end, as shown in the front view of FIG. Formed in one piece. The rear wall surface of this protruding wall 6 has a holding part 6a that comes into contact with a receiving material 3, which will be described later.The holding part 6a is formed diagonally with respect to the main body part 2a of the footboard 2, and its lower end is engaged with the receiving material 3. An engaging protrusion 6b is provided in a protruding manner.

Further, the engaging rib 7 also has the same features as the holding portion 6a.
It is provided to protrude obliquely from the main body part 2a so as to engage with the receiving material 3.

In the figure, reference numeral 8 indicates a non-slipper formed as appropriate on the upper surface of the main body 2a of the footboard 2, and reference numerals 9a and 9b indicate tapping holes used when fixing to the beam member 1.

The supporting material 3 is also made of an extruded shape of lightweight metal such as aluminum, like the girder material 1 and the tread plate 2.
As an example, as shown in the front view of FIG. 5, a hollow member in the shape of an elongated parallelogram is used, and the upper surface 3a of the short side is the attachment part to the tread 2, and the back surface 3b or front 3c of the long side is the attachment part to the girder 1. The angles formed by the top surface 3a and the back surface 3b, and the top surface 3a and the front surface 3c are formed to be equal to the angle formed by the spar material 1 and the tread plate 2 when the tread plate 2 is attached to the spar material 1. In addition, the left and right end surfaces 3d and 3d' of the support material 3 are cut diagonally as shown in the plan view of FIG. 6 to expose the back surface 3b or front surface 3c which will be the attachment part to the girder material 1, and the exposed portions are used for riveting. A hole 10b is provided.

The gripping fitting 4 for attaching to the building frame has a hook portion 4a formed at one end, and the attachment portion 4b to the girder 1 at the other end is shaped like an arrow to reduce weight, and a hole 4 for riveting is provided here.
c), which is manufactured by extruding a lightweight metal such as aluminum and slicing it to an appropriate thickness, or by die-cutting an aluminum or iron plate.

4d in the figure is a lock piece that closes the opening of the hook portion 4a.

To assemble the stairs, first arrange the two girder members 1, 1 in parallel with their respective flanges 5a, 5b facing outward, insert the tread 2 between the parallel girder members 1, 1, and fill the tapping hole 9a. , Tapping screw 1 to 9b
1 and temporarily fix the footboard 2 between the girders 1 and 1.
Next, as shown in FIG. 7, insert the support material 3 into the back side of the footboard 2, abut the back surface 3b of the support material 3 against the outer surface of the upper flange 5a, and insert the hole 10b drilled here for riveting. Blind rivet through 1
2, the support member 3 is attached to the upper surface of the flange 5a above the beam member 1.

Similarly, the outer surface of the lower flange 5b is brought into contact with the front surface 3c of the receiving material 3, and the receiving material is fixed with a blind rivet 12 through a riveting hole (not shown) drilled here. 3 to the upper surface of the lower flange 5b. In this case, the receiving member 3 is formed hollow, so it is lightweight and has sufficient strength. Moreover, since it is formed in a parallelogram shape, the tread plate 2 can be easily attached to the girder member 1 so that the tread plate 2 is inclined at the required angle with respect to the girder member 1.
Forms a support part. By using the long sides of the receiving member 3 as attachment parts, an appropriate number of rivets can be used, so that the receiving member 3 is firmly fixed to the beam member 1. In addition, the support material 3 is formed into an elongated parallelogram, but by cutting its end face diagonally, the rivet attachment parts are exposed from the left and right ends of the tread plate 2, so this part can be used as a work space for fixing to the girder material 1. Rivet installation is also easy.

Then, the footboard 2 is fixed to the upper surface 3a of the receiving member 3 with blind rivets 12, and the tapping screws 11 in the tapping holes 9a, 9b are tightly attached to finally fix the footboard 2 between the beam members 1,1.

When assembled in this way, the upper flange 5
On the a side, the holding portion 6a of the protruding wall 6 formed on the back surface of the footboard 2 is in close contact with the front surface 3c of the receiving material 3, and
The engaging protrusion 6b engages with the end of the lower surface 3e. Also,
On the lower flange 5b side, the engagement rib 7 on the surface of the treadle 2 engages with the end of the back surface 3b of the support member 3, and in this way, the treadleboard 2 is prevented from moving laterally by the beams 1, 1 on both the left and right sides, and The engaging protrusion 6b and the engaging rib 7 prevent back and forth movement, which is effective in preventing lateral vibration.

Also, by engaging the holding portion 6a and the front surface 3c and engaging the engaging protrusion 6b with the lower surface 3e of the support member 3, the support member 3 is deformed when a load is applied to the front end of the footboard 2. Since the protruding wall 6 resists the force, it can withstand a large load.

The other footboards 2 are similarly fixed between the girders 1 and 1, and the mounting parts 4b and 4b of the gripping fittings 4 are inserted between the flanges 5a and 5b, and the holes 4 for riveting are inserted.
The attachment parts 4b of the gripping fittings 4 are attached to both the upper and lower ends of the beam members 1, 1 with rivets via c and 4c. Since the step board 2, the receiving member 3, the gripping fitting 4, and the girders 1, 1 are made of light metal such as aluminum, they are lightweight and easy to handle when attached to the girders 1, 1.

Hold the stairs assembled as above using the gripping bracket 4.
It is attached to the building frame 24 using the hook part 4a and incorporated into the scaffolding. The load applied to the tread plate 2 during use is
is directly fixed to the girder material 1 at two places with tapping screws 11, and is fixed at two places in the front and back by the support material 3, resulting in a double support structure.
It is resistant to loads in the lateral direction and is extremely safe, and the anti-slip 8 formed on the top surface of the footboard 2 makes it safe to use.

If any of the many treadboards 2 is damaged or broken, the damaged part of the treadboard 2 and support material 3 are removed and repaired or replaced with a new one.

When transporting or storing, as shown in Fig. 8, the upper stair tread 2' is inserted between the lower stair girders 1 and 1, and the support material 3' fixed to the tread 2' is removed. , by placing it on the treads 2 of the lower stairs, the stairs can be stacked upwards one after another.

In the above embodiment, the protruding wall 6 provided on the front side of the back surface of the tread plate 2 and serving as the attachment part to the support member 3 is made hollow to provide strength to the front end of the tread plate 2, where a particularly large load is applied. However, the structure is not limited to this, and ribs may be provided at appropriate intervals on the lower surface of the footboard 2.

[Effect of idea]

As mentioned above, in the metal frame scaffolding staircase of the present invention, the tread can be fixed to the girder material through the support material, and in this case, the support material can be attached to the girder material at the exposed end part. This makes it easy to work with and securely fixed.

In addition, since the support material is a parallelogram-shaped hollow material, during use, the load applied to the tread, especially in the vertical direction, is supported by this support material, and the inclination angle between the girder and the tread is also supported by the support material. By fixing the treadboard to the girder material through the Since the angles formed by the treadle are equal and a predetermined value is maintained, there is no variation and safety is high.

Furthermore, in the event that the treadle is damaged, since the receivers attached to the front and rear surfaces of the treadle are interchangeable, repair or replacement work such as replacing the treadle with the receiver can be easily performed.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the metal frame scaffolding staircase of the present invention, Fig. 2 is a perspective view of the same, Fig. 3 is a front view of the girder, Fig. 4 is a side view of the tread, and Fig. 5 The figure is a side view of the receiving material, Figure 6 is a plan view of the same as above, Figure 7 is a vertical side view showing the main part of the stairs of the present invention, Figure 8 is a vertical side view of the main part of the stairs stacked, FIG. 9 is a perspective view showing the entire framework scaffolding, FIG. 10 is a side view showing a conventional framework scaffolding staircase, FIG. 11 is a front view of the same, and FIG. 12 is a perspective view showing another conventional example. . 1... Girder material, 2... Step board, 2a... Main body, 3
...Received material, 3a...Top surface, 3b...Back surface, 3c...
...Front surface, 3d, 3d'...Left and right end faces, 3e...Bottom surface, 4...Gripper, 4a...Hook part, 4b...
...Mounting part, 4c...hole, 4d...lock piece, 5
a, 5b... flange, 6... projecting wall, 6a...
Holding portion, 6b... Engaging protrusion, 7... Engaging rib, 8
... Anti-slip, 9a, 9b ... Tapping hole, 10a, 10b ... Hole, 11 ... Tapping screw, 12 ... Blind rivet, 21 ... Girder material, 22 ... Step board, 23 ... Jacket base, 2
4...Building frame, 25...Cross brace, 26...Cloth board,
27...stairs, 28...clamp.

Claims (1)

[Scope of utility model registration request] In a framework scaffolding staircase in which a tread is fixed between two parallel girder members via a support material, the support material is a long and narrow cross-section of a parallelogram with short sides being the top and bottom sides and long sides being the left and right sides. Formed from hollow material, there are two types of angles: obtuse angle and acute angle.Of the joining angles between the short side and long side, the upper surface of the short side will be the attachment part to the tread, and the long side will be the attachment part to the girder material. The acute angle formed by the back or front surface of the support material is formed to be equal to the angle formed by the girder material and the tread, and the ends of the support material are cut diagonally so that the ends of the back or front surface are exposed from the left and right ends of the tread board. , a metal frame scaffolding staircase characterized by using this part as a work space for fixing to the girder material.