JPH0821173A - Ladder structure - Google Patents

Abstract

PURPOSE:To mount a ladder on a column material extremely simply, to prevent the generation of looseness and to obviate even slipping-out and slipping-off in ladder structure installed to the column material when the assembly of steel frames is finished and a structure is constructed. CONSTITUTION:Trapezoidal disk body-shaped bearer 1 with projecting piece sections 6, 7 are welded at regular intervals in the height direction to a column material. A fastener 4 with holding piece sections 13, 14 so as to hold both projecting piece sections 6, 7 from both outsides is set up integrally to a step body 2 side to the bearer 1, and the step body 2 (the fastener 4) is fitted to the bearer 1 as required. Wedge action mutually preventing lateral movement and wedge action obviating longitudinal movement are displayed by the bearer 1 and the fastener 4, and no looseness is generated as the step body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder structure used in a steel frame assembling site.

[0002]

2. Description of the Related Art At a construction site using steel frames (for example, a construction site for low-rise houses, warehouses, bridges, etc.), pillar members are erected and fixed by using anchor bolts that are pre-planted in a concrete foundation. After that, the procedure of assembling the structure by hanging beams etc. between each pillar is adopted,
At the time of erection of beams and the like, it becomes necessary for the worker to climb on the pillars that have already been erected. Therefore, a ladder may be attached to the side surface of the pillar material.

As shown in FIG. 6, in this ladder 30, two bolts 32 are horizontally projected as a set at a plurality of positions in the height direction with respect to the side surface (standing wall surface W) of the pillar material 31 before standing. The step members 35 are inserted into the bolts 32 that are adjacent to each other at the same height, and fixed by the nuts 36.

[0004]

In the conventional ladder 30, there is a problem in safety because the welding margin of the bolt 32 is small (only the outer peripheral edge portion) and the welding strength is poor. Further, when the step member 35 is attached, the nut 36 must be strongly tightened in order to prevent the step member 35 from rattling, and a tool such as a spanner is required, and workability is poor. In addition, since the step member 35 is generally removed after the beam material is erected, there is a drawback in that the workability is poor in loosening the nut 36 in this case as well.

Further, when the corner portion 31a of the column member 31 or a column member having a circular cross section is used (not shown)
For example, when the vertical wall surface W to which the ladder 30 is attached is not a flat surface, it is extremely troublesome and difficult to make the adjacent objects parallel to each other when welding the bolts 32.
In many cases, the attachment of the ladder 30 had to be given up. The present invention has been made in view of the above circumstances, and the assembly and disassembly of a ladder can be performed easily and quickly, the safety during use (when climbing up and down) is ensured, and the installation position is limited. The purpose is to provide a ladder structure that does not have to do so.

[0006]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention comprises a receiving member that is attached to a vertical wall at predetermined intervals in the height direction, and a step body that includes a retaining member that can be engaged with the receiving device from above and can be engaged. , The receiving member and the hooking device are provided with a rattling prevention structure for strengthening a widthwise wedge action for preventing lateral movement of the step body and an anteroposterior wedge action for preventing forward and backward movement of the step body as the degree of fitting with each other increases. In addition, the retaining structure is provided to prevent the step body from moving upward.

The retaining structure can be composed of a central hole provided in the receiving member and a lock bolt screwed into the step body so that the tip portion can be inserted into the central hole of the receiving member. .

[0008]

[Function] By simply fitting the retaining member of the step body to the receiving member (there is a case of external fitting and a case of internal fitting), the step body is provided with a rattling prevention structure so that the step body has a wedge action in the width direction and a front-back direction. It becomes wedged and held immovably. Therefore, rattling does not occur in the lateral direction or the front-back direction.

If the retaining structure is operated, the step plate can be prevented from coming off due to carelessness or the like. The receiver may be attached to the vertical wall surface of the pillar material by welding or the like, and has an appropriate shape according to each situation so that the welding allowance is large and it corresponds to the vertical wall surface of the pillar material. Can be formed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a unit structure of a ladder structure according to the present invention, and this ladder structure includes a receiving tool 1, a step body 2 and a lock bolt 3. Further, the step body 2 is provided with a hooking tool 4 that can be hooked on the receiving tool 1.

The receiving member 1 has a base plate 5 having a trapezoidal shape, and projecting pieces 6 and 7 which are bent obliquely forward on both left and right sides of the base plate 5 at a gentle angle. . At the center of the substrate portion 5, a central hole 8 having a trapezoidal opening penetrating the front and back sides thereof is formed. The angle at which the overhanging pieces 6, 7 are inclined along both side inclined sides of the substrate 5 is α (around 5 °), and the angle at which the overhanging pieces 6, 7 are inclined toward the outer side is β.
(See FIG. 2, about 45 °).

The step body 2 is
A body portion 10 formed by bending a steel strip into a U-shape and a bridging portion 11 provided in a erected shape on the tip side of the body portion 10 are integrally provided. The latch 4 includes a base plate portion 12 that is wider than the base plate portion 5 of the receiving member 1, and wraps the protruding piece portions 6 and 7 of the receiving member 1 on both left and right sides of the base plate portion 12 from both outsides. Holding pieces 13, 1 bent into hook shapes as much as possible
4 and. That is, the inner dimensions of the lower ends of the holding tools 13 and 14 are wider than the outer dimensions of the upper ends of the protruding pieces 6 and 7, and the inner dimensions of the upper ends of the holding tools 13 and 14 are the protruding pieces. Since the width of the parts 6, 7 is narrower than the outer dimension of the upper end of the parts 6, 7, the hook 4 can be fitted onto the receiver 1. The holding pieces 13 and 14 also have an angle α that is inclined along both side inclined sides of the base plate portion 12 and an angle β that is inclined toward the outer side toward the front (see FIG. 2), similarly to the projecting piece portions 6 and 7. And have.

By the combination of the projecting pieces 6 and 7 of the receiving device 1 and the holding devices 13 and 14 of the hooking device 4 as described above, a rattling preventing structure 15 which exerts a widthwise wedge action and a front-rear direction wedge action. Is configured. In the step body 2, a bolt hole 18 is formed so as to penetrate the main body portion 10 and the latch 4 (actually, as shown in FIG. 3, a portion corresponding to the main body portion 10 is a stupid hole, and only a portion corresponding to the latch 4 is formed. A female screw is formed on the screw hole), and the lock bolt 3 is screwed into the bolt hole 18.

The lock bolt 3 is bolted when the step body 2 (hooking tool 4) is hooked on the receiving tool 1 and fully screwed into the bolt hole 18 of the step body 2. The tip portion is formed in such a length that it reaches the inside of the central hole 8 of the receiver 1. Therefore, the step body 2 cannot be pulled up with respect to the receiving tool 1, and thus the retaining structure 19 is configured. The lock bolt 3 having the above-described length facilitates the operation of the retaining structure 19 (it is not necessary to judge whether or not the tip of the bolt is securely inserted into the central hole 8) and Although there is an advantage that the lock bolt 3 is prevented from being over-tightened, this is not a limitation.

In the step body 2, the left and right projecting portions 10a of the main body portion 10 serve as a grip portion for climbing and descending, and the transition portion 11 serves as a footrest portion. A plurality of punched holes 20 are formed in the crossover portion 11 to prevent the foot from slipping, and both end rising portions 21 are bent to prevent the foot from being stepped off.
The crossover portion 11 has a small width in the front-rear direction so that it can be used also as a grip portion.

In order to attach the ladder structure thus constructed to the vertical wall surface W of a pillar or the like, first, the receiving tool 1 is attached to the base plate portion 5.
Is fixed to the vertical wall surface W by welding or the like with the narrower side thereof facing up. In this case, the upper edge portion 1a and the lower edge portion 1b of the receiving tool 1 can be used as a welding allowance, and the inner edge portion of the central hole 8 (inner periphery excluding the upper edge portion 8a) is also welded to obtain a welding strength. Can be increased. Therefore, safety can be ensured. The upper edge portion 8a of the central hole 8 is preferably not welded in order to obtain an engaging action with the lock bolt 3.

Then, the hook 4 of the step body 2 is fitted into the receiver 1 from above when necessary. At this time, as shown in FIG.
7 and the holding tools 13 and 14 of the hooking device 4 form an angle α (see FIG.
The lateral movements are blocked by the widthwise wedge action caused by the reference (1), and the forward and backward movements are blocked by the frontward-backward wedge action caused by the angle β. Therefore, the step body 2 as a whole is immovable because it is restricted so that it does not rattle in the lateral direction or in the front-back direction.

After this, the lock bolt 3 is screwed into the bolt hole 18 of the step body 2, and the tip portion of the lock bolt 3 is inserted into the central hole 8 of the receiver 1 (see FIG. 3). This prevents the step body 2 from escaping. Therefore, even if, for example, the step body 2 is inadvertently kicked up, the step body 2 never receives the support 1
Even if you go up and down,
It also ensures safety for those below.

Of course, when removing the step body 2, it is sufficient to loosen the lock bolt 3 and pull the step body 2 upward. By the way, in the present invention, the receiver 1 may be as shown in FIG. In this receiver 1, the base plate portion 5 is curved, and the vertical wall surface W is easily and reliably welded to, for example, a corner portion 31a of a column member (see reference numeral 31 in FIG. 6) or a column member having a circular cross section. I can do it.

Further, as shown in FIG. 5, the latch 4 provided on the step body 2 is assumed to have the projecting piece portions 6 and 7, and the receiving tool 1 has these projecting piece portions 6 and 7. 7 is provided with holding tools 13 and 14 capable of hugging from the outside (that is, the directions of angles α and β are opposite to those of the above-described embodiment, and the holding tool 1 is used. The latch 4 may be fitted inside).

The lock bolt 3 may be provided with an operating head (not shown) such as a wing bolt so that it can be easily screwed by hand. The angles α and β provided in the receiving tool 1 and the hooking tool 4 are not limited numerically. Further, the configuration and shape of the step body 2 are not limited at all.

[0022]

According to the present invention, which has the above-mentioned structure, the step body can be wedged in the width direction by the rattling prevention structure only by fitting the hook of the step body into the receiving member. In addition, the immobility is limited by the front-rear direction wedge action, and rattling does not occur in the lateral direction or the front-rear direction. Therefore, the assembly and disassembly of the ladder can be performed easily and quickly.

Further, if the retaining structure is operated, the step plate can be prevented from coming off due to carelessness and the like, so that the safety during use (when climbing up and down) is secured. Since the receiving tool can be formed in a shape according to each situation so as to increase the welding allowance and to correspond to the vertical wall surface of the pillar material or the like,
The attachment position is not limited, and moreover, it can be securely fixed to the standing wall surface. Therefore, versatility can be expanded and safety can be further improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a unit structure of a ladder structure according to the present invention.

FIG. 2 is a main part plan view showing an assembled state of the embodiment.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view showing another embodiment of the receiving tool.

5A and 5B show another embodiment of the ladder structure according to the present invention, in which FIG. 5A is a plan view of a main part and FIG. 5B is a front view of the main part.

FIG. 6 is an exploded perspective view showing a conventional ladder structure.

[Explanation of symbols]

 1 Receiving tool 2 Step body 3 Lock bolt 4 Locking tool 8 Central hole 15 Backlash prevention structure 19 Detachment prevention structure W Standing wall surface

Claims (2)

[Claims] 1. A receiver (1) attached to a vertical wall (W) at a predetermined interval in the height direction, and a hook which is fitted into the receiver (1) from above and can be hooked. A widthwise wedge comprising a step body (2) provided with (4), and which prevents lateral movement of the step body (2) as the degree of fitting of the receiver (1) and the latch (4) increases. A rattling prevention structure (15) for strengthening the action and a front-rear direction wedge action for preventing the step body (2) from moving forward and backward is provided, and a retaining structure for preventing the step body (2) from moving upward ( 19)
Ladder structure characterized by being provided with. 2. The retaining structure (19) includes a receiving member (1).
And a lock bolt (3) screwed into the step body (2) so that the tip can be inserted into the center hole (8) of the receiving tool (1). The ladder structure according to claim 1, wherein the ladder structure is provided.