JP7129959B2 - Work floor for shaft construction - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working floor installed inside a shaft for construction of a shaft constructed underground.

Shafts built underground are used for multiple purposes, such as starting and arrival bases for shield machines in shield tunnel construction, interim storage of radioactive waste, and foundations for bridges. Since the construction work of this vertical shaft involves work such as excavation and blasting inside the shaft, and construction of the side walls and bottom slab, a work floor that can be freely raised and lowered from the ground to the working depth is required.
Generally, in the construction of a vertical shaft, the working floor is rebuilt following the excavation of the ground. When excavation of the ground involves blasting, this working floor further has a function of preventing scattering during blasting work. The work floor can be rebuilt by using lifting equipment such as a crane installed on the ground to lower the work floor, and during work on the work floor, it is anchored to the shoring installed on the wall of the shaft. traditionally applied.

In Patent Document 1, a door for loading and unloading of equipment and a door for loading and unloading of workers, which can be freely opened and closed in contact with the inner wall of the vertical shaft or with a slight gap, are provided, and pipes and machines are suspended and lifted. A working floor for vertical shaft construction having a doorway and a hatchway for workers to ascend and descend, and a mounting device therefor are disclosed.

Utility Model Registration No. 3107458

According to the work floor for shaft construction and its mounting device described in Patent Document 1, there is no need to provide a fall prevention fence around the opening, and it is possible to effectively prevent workers and pedestrians from falling and objects from falling. However, it does not solve the problems such as the frequent opening and closing of the openable and closable door for carrying in equipment, which requires time, and the problem of flying and falling from the opening in the open state.
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. A work floor for vertical shaft construction that can shorten the opening and closing time of a door for carrying in equipment with a simple structure and can achieve fall prevention measures at the same time. The task is to propose

A work floor for shaft construction according to the present invention for solving the above-mentioned problems comprises a stage that can be accommodated in the shaft; an opening that is rectangular in plan view provided in the stage; A pair of side plates that are substantially inverted V-shaped in a side view and erected along the edge, a pair of lid plates that are rotatably installed around the other opposite edge of the opening, wherein the lid plate is configured to cover the edge of the side plate when the opening is closed, and the lid members are locked together so as not to open due to wind pressure or stepping stones caused by blasting performed below the stage It is characterized by being locked by
Furthermore, the work floor for shaft construction of the present invention includes a stage that can be accommodated in the shaft, an opening that is rectangular in plan view provided in the stage, and along one of the opposite edges of the opening. a set of side plates that are substantially inverted V-shaped when viewed from the side, and a set of lid plates that are rotatably installed around the other opposite edge of the opening, The lid plate further comprises a wire having one end fixed to the lid plate so as to cover the edge of the side plate when the opening is closed, and the tension of the wire causes the opened state of the opening. and the wire is secured against the reaction force of the tension from the stage.
Moreover , the cover plate may be further supported by a stopper erected on the stage.

According to the work floor for shaft construction of the present invention, it is possible to shorten the opening and closing time of the equipment carrying-in door and to achieve fall prevention measures at the same time with a simple structure.

It is a top view of the work floor for shaft construction of this invention. FIG. 1 is a cross-sectional view of a work floor for shaft construction according to the present invention (as viewed from the arrow AA in FIG. 1), (a) showing the opening and (b) showing the opening closed. FIG. 2 is a cross-sectional view of the work floor for shaft construction according to the present invention (as viewed by arrows BB in FIG. 1), where (a) shows when the opening is open and (b) shows when the opening is closed.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view of a work floor for shaft construction according to the present invention, showing a closed state of an opening, which will be described later. FIG. 2 is a cross-sectional view of the work floor for shaft construction according to the present invention, taken along the line AA in FIG. each shown. Furthermore, FIG. 3 is a cross-sectional view of the work floor for shaft construction of the present invention, which is viewed from the arrow BB in FIG. each shown.

As shown in FIG. 1, a work floor 1 for shaft construction according to the present invention includes a stage 2 processed into a shape and size that can be accommodated in a circular shaft S formed by excavating and constructing the underground, and a stage 2 A rectangular opening O in plan view, a pair of side plates 3, 3 substantially inverted V-shaped in side view standing along one edge of the opening O, and the opening O. and a pair of cover plates 5, 5 rotatably installed around the other opposite edge of the opening O, and the cover plates 5, 5 cover the edges of the side plates 3, 3 when the opening O is closed. is configured as

As shown in FIGS. 2 and 3, the stage 2 is a combination of a plurality of beam members made of shaped steel such as H-shaped steel and floor materials made of steel plates such as checkered steel plates, and is integrally formed using a joining method such as bolts or welding. is formed as The stage 2 is processed to have a shape and dimensions that do not interfere with the inner peripheral surface of the shaft S after construction and various temporary materials laid on the inner peripheral surface. Near the center of the stage 2, an opening O, which is rectangular in plan view, is formed. The shape and dimensions are determined in consideration of all possible operations such as carry-out, carry-out for evacuation of heavy machinery during blasting work, and re-carry-in. In addition, when work is performed at the same time above and below the shaft S with the work floor 1 as the boundary surface, it is necessary to ensure the safety of the workers below from flying and falling from the opening O, and to prevent blasting work below. From the viewpoint of accident prevention against flying gravel and the like caused by the blast, the opening O has a structure that can be closed by side plates 3, 3 and cover plates 5, 5, which will be described later.

As shown in FIGS. 1 and 3, the side plate 3 is a substantially inverted V-shaped plate member erected along one of the opposing edges of the opening O when viewed from the side, and is formed by combining a plurality of shaped steels and steel plates. It is One of the support members 4 , 4 , 4 is fixed to the rear side of the opening of the side plate 3 , and the other is fixed to the stage 2 . The support member 4 is a diagonal member made of H-section steel.

As shown in FIGS. 1 to 3, the cover plate 5 is a plate material that is rotatably installed around the other opposite edge of the opening O, and is formed by combining a plurality of shaped steels and steel plates, similar to the side plate 3. It is Rotation of the lid plate 5 is realized by connecting to a plurality of hinges 6, 6, 6 . . . The shape and dimensions of the cover plate 5 are determined so that when the opening O is closed, the edge of the side plate 3 is covered and no gap is formed between the edges of the cover plates 5, 5 facing each other.
As shown in FIGS. 2(b) and 3(b), in the closed state of the opening O, the lock members 51, 51 are used to prevent the opening O from being easily opened by the wind pressure of the blast from the blasting performed below the work floor 1. Lockable.
One end of the wire 7 is rotatably fixed on the back side of the opening of the cover plate 5, and the other end is engaged with a pulley 81 provided on a stopper 8 erected on the stage 2. , and is wound around a winch 9 fixed on the stage 2 . The cover plate 5 is opened and closed by sending out and winding up the winch 9 .
When the opening O is opened, the cover plate 5 is supported by the stopper 8 so that the center of gravity of the cover plate 5 acts on the opening O side. As a result, tension always acts on the wire 7, making manual work unnecessary, and opening and closing of the cover plate 5 can be realized only by controlling the winch 9.例文帳に追加

As described above, according to the work floor for shaft construction of the present invention, it is possible to shorten the opening and closing time of the door for carrying in equipment and to achieve fall prevention measures at the same time with a simple configuration.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the present invention.

S shaft O opening 1 work floor 2 stage 3 side plate 4 support member 5 cover plate 51 lock member 6 hinge 7 wire 8 stopper 81 pulley 9 winch

Claims (3)

a stage that can be accommodated in a shaft;
an opening having a rectangular shape in a plan view provided in the stage;
a pair of side plates that are substantially inverted V-shaped in a side view and erected along one of the opposing edges of the opening;
a pair of lid plates rotatably installed around the other opposite edge of the opening,
The lid plate is configured to cover the edge of the side plate when the opening is closed, and the lid members are locked together by a locking member so that they do not open due to wind pressure or stepping stones caused by blasting performed below the stage . A working floor for shaft construction, characterized by: a stage that can be accommodated in a shaft;
an opening having a rectangular shape in a plan view provided in the stage;
a pair of side plates that are substantially inverted V-shaped in a side view and erected along one of the opposing edges of the opening;
a pair of lid plates rotatably installed around the other opposite edge of the opening,
The cover plate is configured to cover the edge of the side plate when the opening is closed ,
further comprising a wire having one end fixed to the lid plate;
the tension of the wire keeps the opening open;
A work floor for shaft construction, wherein the wire is secured against the reaction force of the tension from the stage . 3. The work floor for pit construction according to claim 2, wherein the cover plate is further supported by a stopper erected on the stage when the opening is opened.

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