JP2001164856A - Ladder structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ladder capable of being manufactured easily at an execution site and allowing a worker to ascend or descend it safely. SOLUTION: Single pipes 1, 1, 1 are used as supports, and cross beam members 2 concurrently serving as tread sash bars and protective frames are fixed to the single pipes 1, 1, 1 by clamps 3, 3, 3 at prescribed intervals to form a cage-shaped ladder L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder structure, and more particularly to a ladder structure which can be easily manufactured at a construction site and can be safely moved up and down.

[0002]

2. Description of the Related Art Conventionally, when excavating a vertical shaft or the like in a shield work, when a vertical cross section of the vertical shaft is small, it is necessary to use a ready-made aluminum ladder, or to use an angled material at a construction site. A ladder made by processing rebar and the like was used.

[0003]

The above prior art has the following problems. 1. There is a high risk of falling due to slipping of limbs when going up and down. 2. There is a high risk of accidents being pinched between the drilling bucket and the ladder. 3. There is a high risk of accidents due to falling objects from the upper shaft. 4. Failure to fix the ladder causes loss of balance and a high risk of falling. 5. Ladder production is troublesome and workability is poor.

[0004] Therefore, there arises a technical problem to be solved in order to obtain a ladder structure which can be easily manufactured on a construction site and can be safely moved up and down. The present invention aims to solve this problem.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object. A single pipe is used as a column, and a horizontal girder member serving as a protection frame for stepping on the single pipe is provided at a predetermined interval. And a ladder structure which is fixed in a cage to form a cage shape, and a ladder structure in which the cross beam member is provided with a non-slip.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a sectional view showing an installation state of the ladder L in the shaft S. The shaft S is a starting base of a shield excavator (not shown), and has a predetermined circular cross section to serve as a material entrance and an excavation soil exit,
It is constructed by excavating a predetermined depth from the ground G with an excavator (not shown) such as a hydraulic excavator or a backhoe.

At the same time as excavation of the shaft S, a liner plate R is assembled on the inner peripheral surface of the shaft S to prevent earth and sand and groundwater from entering the shaft S from the ground G. When the shaft S has a small diameter, the ladder L is moved along the liner plate R to raise and lower a worker when the shaft S is excavated.
Is installed. The ladder L is provided in accordance with safety rules according to the depth of the shaft S, provided with landing sections C at predetermined intervals and divided in length. On the other hand, the cross-sectional shape of the plane of the ladder L is divided into a cross-sectional shape of a general portion A described later, and a cross-sectional shape of an elevating port B at an upper end and a lower end of the ladder L. Further, the elevator port B is also applied to a place where the vehicle moves to the next ladder L via the landing section C. The ladder L is provided with the shaft S so as not to hinder the excavation and the transport of materials by the excavating machine as described above.
It is installed vertically along.

FIG. 2A shows a plane of a general portion A of the ladder L, and three single tubes 1, 1, 1 serving as columns of the ladder L are arranged around the ladder L at equal intervals. The single pipe 1,1,1 is a ready-made diameter of 48.6 mm used for a scaffolding member at a construction site, for example.
It is a round pipe. The length of the ladder L is also appropriately adjusted according to the length of the single pipe 1, and when it is desired to extend the length, the single pipe joint (not shown) is used to extend the ladder L. The single tube 1,
The inside diameter of the horizontal girder member 2, which also serves as a protection frame for preventing a contact accident between the ladder L and the excavating machine when the worker goes up and down, is set inside the inside of the ladder L. Attach horizontally to the outer diameter of the tubes 1,1,1 using off-the-shelf clamps 3,3,3.

The horizontal girder member 2 is formed by forming a circular pipe having a diameter of 40 mm into a ring shape, and by setting the outer diameter of the ring to 600 mm, a space for ascending and descending an operator is secured in the ring. Also, the single pipe 1 serving as a support for the ladder L of the cross beam member 2
The mounting interval in the longitudinal direction is 300 mm according to the safety regulations.
At equal intervals. Therefore, the single pipes 1, 1, 1 and the horizontal beam members 2, 2,... Are formed in a cylindrical basket shape. The shape of the cross beam member 2 is formed in a circular shape which is considered to be the best in terms of elevating function and rigidity, but may be formed in a polygonal shape such as a triangle or more if it does not hinder the elevating operation.

In addition, three single pipes 1 serving as the above-mentioned struts are arranged at equal intervals, and the horizontal beam members 2 are connected by the clamps 3, 3, 3 so that the load is evenly distributed and stable. Although the ladder L is formed on the ladder L, the ladder L can be formed even if one or more of the single pipes 1 are tightly connected to the single pipe 1 and the cross beam member 2. The number of pipes may be appropriately changed depending on the design of the ladder L. Further, the outer periphery of the horizontal girder member 2 is subjected to a non-slip processing in order to enhance the safety of lifting and lowering. The non-slip processing is performed by making grooves in the outer periphery of the cross beam member 2 at equal intervals, or by sticking a member having high frictional resistance such as rubber or rubber over the entire periphery.

FIG. 2B shows a plane of the elevating port B.
The cross beam member 2a provided with an opening W serving as an entrance into the ladder L is installed in a predetermined section in the longitudinal direction of the ladder L as shown in FIG. The opening W is formed in the vicinity of the single tubes 1 and 1 so as to secure a worker's access width of 400 mm.

FIG. 2 (c) shows a plane of the landing section C of the ladder L, and the cross beam member 2b has the opening W similarly to the elevator port B. The direction of the opening W is provided at a position where it can be moved laterally to the next ladder as shown in FIG. Further, on the floor of the landing section C, a tread 4 such as a striped steel plate or an expanded metal is laid around the entire inside diameter of the cross beam member 2b by welding or fastening to form a scaffold.

FIG. 3 shows a plane where the next ladder L moves from the landing section C. The ladder L is installed in the shaft S at predetermined intervals at predetermined intervals, as shown in FIG.
The fixing to the shaft S is performed by using a joint member 6 composed of a round pipe joined by a straight clamp 10 from one of the single tubes 1 serving as a support.
Is horizontally disposed toward the cross beam 5 of the liner plate R of the shaft S, and the cross beam 5 and the joining material 6 are firmly fixed by the catch clamp 9. In addition, the joining material 6 may be directly welded to the cross beam 5 and fixed.

The ladder L is connected to the overlapping portion of the elevating port B by connecting a single pipe 1a, 1a serving as a support of the ladder L with a round pipe connected by the straight clamps 10, 10. The members 7, 8 are horizontally disposed toward the single tubes 1b, 1b of the other ladder L, and the transfer members 7, 8 and the single tubes 1b, 1b
And the ladders L, L are connected by the straight clamps 10, 10. Further, the joint member 6 joined by the straight clamp 10 from the center of the bridge member 7 on the liner plate R side of the shaft S is disposed horizontally toward the cross beam 5, and The joint member 6 is firmly fixed with the catch clamp 9. In addition, a striped steel plate, expanded metal, or the like is laid on the crossover portion 11 between the crossover members 7 and 8 that transfer from the landing portion C to the next ladder L to ensure safety.

Although the ladder shown in the above embodiment has been described for elevating a shaft, the ladder can also be used for elevating and lowering a scaffolding and formwork of a bite frame, and for elevating a manhole in a sewer. Further, the shape, size, and the like of the ladder should not be limited to the above, and may be appropriately changed depending on the design of the ladder.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0017]

As described above, according to the first aspect of the present invention, a ladder is formed by fixing a horizontal girder member serving as a protection frame also serving as a tread to a single pipe by using a single pipe as a column and using a clamp. The single pipe and the clamp used as the material of the ladder can be easily diverted and used at the construction site, and can be easily assembled. In addition, since the horizontal girder member is formed in a cage shape, it can be raised and lowered in any direction when ascending and descending, and the back surface is a backrest, so that there is little danger of falling even if the limbs slide. Further, the present invention has a remarkable effect, such as contributing to prevention of a disaster caused by falling of a flying object at the time of ascending or descending and an accident of being pinched by a digging bucket.

According to the second aspect of the present invention, the cross girder member is provided with a non-slip, so that not only the limbs can be prevented from slipping but also the backrest portion can be made non-slip so that it can be stabilized at the time of the backrest during work or the like. Become.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention and showing a state where a ladder is installed in a shaft.

FIG. 2A is a plan view showing a general part of a ladder. (B) The top view which shows the raising / lowering opening part of a ladder. (C) The top view which shows the landing part of a ladder.

FIG. 3 is a view as viewed in the direction of the arrows in FIG. 1;

[Explanation of symbols]

 1, 1a, 1b Prop (single pipe) 2 Cross beam member 3 Clamp L ladder

Claims (2)

[Claims] 1. A ladder structure wherein a single tube is used as a column, and a horizontal girder member serving as a protection frame also serving as a step is fixed to the single tube with a clamp at predetermined intervals to form a cage. 2. The ladder structure according to claim 1, wherein the cross beam member is provided with a slip stopper.