JP2989366B2 - Fall prevention device in piping - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention device in a pipe which is applied to a work in a horizontal pipe portion of a circulating water pipe in a thermal power plant, a nuclear power plant or the like.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view of a circulating water pipe in a conventional thermal or nuclear power plant. In the figure, when working in the horizontal piping section of the circulating water pipe 1, a simple fall prevention fence is provided at the end of the horizontal piping section with a scaffolding pipe, a barricade material, a net, etc., in order to prevent falling into the vertical piping section. Working. Reference numeral 2 denotes a manhole provided at the top of the vertical pipe.

[0003]

As described above, when working in the horizontal piping section of the circulating water pipe 1 in a thermal power plant, a nuclear power plant, or the like, a simple connection is made to the end of the horizontal piping section in order to prevent the falling into the vertical piping section. The work is done by installing a fall prevention fence, but the fall prevention fence cannot be completely fixed to the inside of the pipe to protect the anticorrosion coating on the inside of the pipe, so it is installed in an unstable state As a result, there is a problem in work safety in the piping.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a device for preventing falls in a pipe according to the present invention. The apparatus is suspended from a manhole at the top of a vertical pipe and can be opened and closed in an inverted umbrella shape. Fan shaped to fit the inside dimensions of a curved tube
Of the first safety net extending to the first safety net
Hanged from the manhole at the top of the vertical pipe below
It is stretched on an arm member that can be opened and closed in an inverted umbrella shape, and
A second safety net extending in a circular shape matching the inner circumference;
Means for opening and closing the arm member of the first safety net and the arm member of the second safety net in an inverted umbrella shape to a horizontal position .

[0005]

That is, in the apparatus for preventing falls in a pipe according to the present invention, the first safety net having the above-described structure and the first safety net are provided.
A second safety net beneath the arm is connected to its respective arm
Since the member is opened in a reverse umbrella shape to the horizontal position and installed,
Fall from horizontal piping due to the first safety net at the top
Inside the first safety net and vertical piping
The second safety net at the bottom even if you slide down from the gap with the wall
This prevents falling into the vertical piping.

[0006]

1 to 5 are illustrations of an apparatus for preventing falling in a pipe according to an embodiment of the present invention. In the figure, the fall prevention device in the pipe according to the present embodiment is used for preventing the fall into the vertical pipe part at the time of work in the horizontal pipe part of the circulating water pipe in the thermal power plant,
As shown in the figure, a protection guide 3 is hung from an opening of a manhole 2 provided at the top of the vertical pipe of the circulating water pipe 1 to protect the anticorrosion coating on the inner surface of the pipe. A sleeve 5 equipped with an inverted umbrella type safety net 18a that expands in a fan shape that matches the shape and dimensions of the inside of the curved pipe, and an inverted umbrella type safety net 18b that expands in a circular shape that fits the inner circumference of the vertical piping section. Of the safety net 18 by hanging the wire ropes 14 and 15 holding the safety nets 18a and 18b.
The a and 18b are spread horizontally to prevent falling from the inside of the horizontal piping section to the inside of the vertical piping section.

That is, as shown in FIG. 1, a protection guide 3 for protecting the anticorrosion coating film is formed of a steel pipe along the inner diameter of the manhole 2 at the top of the vertical pipe of the circulating water pipe 1, and a rubber hose is provided around the steel pipe. In order to prevent the anticorrosion coating film on the inner surface of the manhole 2 from being damaged. The sleeve 5 has a two-stage first safety net and a second safety net.
The safety nets 18a and 18b serving as safety nets are mounted, and are formed of steel pipes so as to be lowered along the inner surface of the protection guide 3 and hung. A plurality of arms 9 that can move up and down as shown by arrows from the state to the vertical state
a, 9b are attached via pins 11. The length of the upper arm bar 9a is set so as to spread out in a fan shape that matches the shape and size of the inside of one circulating water pipe. Lower arm 9b
The length of the circulating water pipe 1 is set so as to spread in a circular shape corresponding to the inner diameter of the vertical pipe. Rubber caps 13 are provided at the ends of the arms 9a and 9b to prevent damage to the anticorrosion coating.
Is installed. A step 7 for elevating is attached to the sleeve 5. As shown in FIG. 2, a ratchet type winch 16 is provided at the upper end of the sleeve 5 via a plate attached to a flange above the manhole 2. Install the guide pole 4 on the plate 2
Two holes 20 are provided. The wire rope 14 mounted on the winch 16 hangs down along the sleeve 5 as shown in FIG. 3, passes through the wire rope guide 6, and the suspension pieces 12 of the plurality of arms 9a, 9b at the upper and lower stages.
Wire rope 14 and link 17 attached to
And a wire rope 15 and a link 17. As shown in FIG. 4, the armatures 9a and 9b are moved by operating the winch 16 to thereby fix the armature mounting plates 10a and 10b.
The pin 11 can be rotated 90 degrees around the center. The sleeve 5 is provided with a vertical stopper 8 so that the arms 9a and 9b do not fall down toward the center.

When the fall prevention device is installed in the vertical piping section of the circulating water pipe 1, as shown in FIG.
The cover plate of the manhole 2 provided at the top of the vertical pipe is removed, a plate is attached using the flange of the manhole 2, and two guide poles 4 are fitted into two holes 20 formed in the plate. Stand up. Protection Guide 3
Of the protection plate 3 is suspended in the manhole 2 along the guide pole 4. The sleeve 5 to which the safety nets 18a and 18b are attached is lowered along the guide pole 4, suspended through the protection guide 3 installed in the manhole 2, and suspended on the top of the vertical pipe of the circulating water pipe 1, and the flange at the top of the manhole 2 The sleeve 5 is fixed by connecting the upper end of the sleeve 5 and the plate at the upper end of the sleeve 5 with flange bolts. The handle of the winch 16 is turned to loosen the wire ropes 14, 15, and the arms 9a, 9b to which the safety nets 18a, 18b are attached.
To the horizontal position and expand. The expanded safety nets 18a and 18b prevent falling from the horizontal pipe section to the vertical pipe section. When withdrawing the safety nets 18a and 18b, the procedure is reversed.

As described above, the sleeve 5 is hung from the opening of the manhole 2 at the top of the vertical pipe of the circulating water pipe 1 through the protection guide 3, and the inverted umbrella-type safety net 18a that spreads in an upper fan shape is installed. Fall from the horizontal piping section is prevented, and the safety net 18a
Even if it slides down from the gap between the inner wall of the vertical pipe and the vertical piping, the safety net 18b of the inverted umbrella type spreading in the lower circle can be completely saved. In addition, even if the present fall prevention device is installed, damage to the anticorrosion coating film on the inner surface of the circulating water pipe 1 can be prevented, and the work time for installing the fall prevention equipment and the number of workers can be reduced.

[0010]

The fall prevention device in a pipe according to the present invention is configured as described above, and the fall in the vertical pipe is prevented, so that the safety of work in the pipe is improved.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a fall prevention device in a pipe according to an embodiment of the present invention, and FIGS. 1B and 1C are cross-sectional views of a protection guide thereof.

FIG. 2A is a plan view of the winch, and FIG. 2B is a front view.

FIG. 3 is a front view of the wire rope.

4 (a) and 4 (b) are plan views of the arm, and FIG. 4 (c) is a front view.

FIG. 5 is an explanatory diagram of these operations.

FIG. 6 is a front view of a conventional circulating water pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circulating water piping 2 Manhole 3 Guide for protection of anticorrosion coating film 4 Guide pole 5 Sleeve 6 Wire guide 7 Step 8 Stopper 9a, 9b Arm bar 10a, 10b Arm bar mounting plate 11 Pin 12 Hanging piece 13 Rubber cap 14, 15 Wire rope 16 Ratchet type winch 17 Ring 18a, 18b Safety net 19 Guide plate 20 Hole for guide pole

Claims (1)

(57) [Claims] 1. An arm member which is suspended from a manhole at the top of a vertical pipe and can be opened and closed in an inverted umbrella shape .
The first of the safety net and, on that spread in a fan shape that matches the shape and size
The man on the top of the vertical pipe below the first safety net
Arms suspended from the hall and openable and closable like an inverted umbrella
Is installed and the second expands in a circular shape that matches the inner circumference of the vertical piping section.
A safety net, arm members and a front of said first safety net;
Means for opening and closing the arm member of the second safety net in an inverted umbrella shape to a horizontal position .