JPH08196650A - Mixed gas breathing device for work under high pressure - Google Patents

Abstract

PURPOSE: To efficiently carry out work under a high pressure such as caisson work safely by providing a mixed gas breathing device with plural branched mixed gas feeding hoses having flexibility and mixed gas feeding line connected to a respirator at the tip. CONSTITUTION: Although a man shaft 6 is opened to the atmosphere until a worker descends to a man lock 5 by an elevator 7, the man shaft 6 is cut off from the atmosphere when the worker enters the man lock 5, and an air pressure is increased by means of compressed air fed from a compression air feeding pipe 10, and then, the worker puts on a respirator 1. The worker breathes mixed gas fed through a mixed gas feeding pipe 4 from the outside via a mixed gas feeding hose 2. A compressed air feeding pipe 10 is also installed in a working chamber 13 under a floor slab 12 in a caisson 11 so as to increase an air pressure, and when the worker descends to the working chamber 13, the mixed gas feeding hose 2 is automatically extended from a hose reel 3, and the worker can freely work while wearing the respirator 1.

Description

Detailed Description of the Invention

[0001]

[Industrial field of use] When working in a tunnel in civil engineering, construction work, or other work in high pressure, if the pressure exceeds a certain limit, there is a health problem in the breathing state of high pressure air. Instead of breathing high-pressure air, breathing a mixed gas is performed. It relates to the breathing apparatus in this case.

[0002]

2. Description of the Related Art For example, a conventional method of working inside a box in civil engineering and construction work will be described step by step.

FIG. 3 shows an example of a conventional mixed gas breathing method.

(A) The manlock 5 is pressurized from the outside with compressed air, and the worker who has entered the manlock 5 breathes the compressed air.

(B) The atmospheric pressure of Mannlock 5 is about 3 kg / cm ² G
Then, the worker wears the breathing mask 1, connects the intake pipe 14 provided in the breathing mask 1 to the mixed gas sampling plug 15 introduced from the outside, and breathes the mixed gas.

(C) In the above state, the manlock 5 is boosted to a predetermined working pressure.

(D) When the atmospheric pressure of the man lock 5 reaches a predetermined pressure, the worker carries the mixed gas cylinder 16 on his back and connects the intake pipe 14 provided in the breathing mask to the mixed gas cylinder 16 and changes it.

(E) The worker carrying the mixed gas cylinder 16 descends the spiral staircase of the man shaft 6 and enters the working chamber 13.

(F) Inside the working chamber 13, the enclosure 1 is
Plug 17 of mixed gas line guided through side wall 1
The inspiratory pipe 14 provided in the respiratory mask 1 is connected to and changed.

(G) In this state, the worker works in the box 13.

(H) After the work is completed, the worker carries the mixed gas cylinder 16 again, switches the intake pipe 14 to the cylinder 16, climbs the man shaft 6 and returns to the man lock 5.

(I) The operator switches the intake pipe 14 from the mixed gas cylinder 16 to the mixed gas sampling plug 15 introduced from the outside.

(Nu) Manlock 5 is depressurized to about 3 kg / cm ² G
When the pressure reaches, the worker removes the breathing mask 1 and thereafter, while breathing compressed air, decompresses the man-lock 5 to the atmospheric pressure and finishes.

The above is the conventional mixed gas breathing method. In addition to this, the mixed gas breathing pipe is passed through the man shaft 6 and the mixed gas breathing pipe is provided with an interval corresponding to the length of the suction pipe provided in the breathing mask. In some cases, a mixed gas sampling plug is provided at a required place so that an operator does not have to carry the mixed gas cylinder 16 on his / her back.

[0015]

It is generally known that breathing high-pressure air in the above-mentioned box or high pressure causes various effects on the human body and impairs health. Especially when the atmospheric pressure exceeds 3 kg / cm ² G, oxygen poisoning and nitrogen sickness may occur, which may be life-threatening.

[0016] Thus Once pressure is ^{3kg / cm 2 G ~4kg / cm} 2 G or more since a mixed gas to the operator of the work chamber, for example, (helium and nitrogen + oxygen) or (neon + nitrogen + oxygen), or (hydrogen Breathing a ternary gas (+ nitrogen + oxygen) or a binary gas such as (helium + oxygen) or (neon + oxygen) or (hydrogen + oxygen) is performed.

It is common for an operator to wear a breathing mask to breathe these mixed gases, but in the conventional method,
As described in detail above, there are the following inconveniences.

(A) A mixed gas line attached to an externally supplied mixed gas supply pipe every time the mixed gas cylinder is carried on the back, lowered, when the work is started in the working chamber, at the end of the work, etc. Since the inspiratory tube of the breathing mask is connected to the plug of the above item to change it, compressed air must be breathed for a short time, which is not preferable for health management.

(B) Since the man shaft must be moved by carrying a heavy mixed gas cylinder on its back, work efficiency is not good.

Even if the mixed gas cylinder is not carried on the back, the intake pipe of the breathing mask must be detached several times to breathe compressed air.

The present invention has been devised to solve the above problems.

[0022]

A mixed gas gas supply pipe, a mixed gas supply hose having a plurality of branches at the tip of the mixed gas gas supply pipe and each having flexibility, and a tip of the mixed gas supply hose. The mixed gas supply line to which a breathing mask is connected to and the mixed gas supply hose are normally wound on a hose reel, and when a tensile force acts, they automatically extend and give a slight tensile impact in the extended state. And a hose reel having a means for generating a force to wind the hose reel, which is a main object of the mixed gas breathing apparatus at the time of working under high pressure.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mixed gas breathing apparatus according to the present invention for working under high pressure will be described below with reference to the drawings.

FIG. 1 shows a respirator according to the present invention in which a man lock 5 is installed near a floor slab 12 of a box 11, and an elevator 7 moves up and down inside a man shaft 6 connected to the man lock 5. It is a figure which shows the Example of. Until the worker gets down to the man lock 5 at the elevator 7, the man shaft 6
Is open to the atmosphere, but when the worker enters the manlock 5, the manlock 5 is shut off from the atmosphere, and the compressed air supply pipe 1
Compressed air sent from 0, the air pressure is about 3kg / c
After raising the pressure to m ² G, the worker wears the respiratory mask 1. A mixed gas gas supply pipe 4 is provided in the man-lock 5, and a plurality of mixed gas supply hoses 2 made of a flexible material is branched at the tip of the mixed gas gas supply pipe 4.
A plurality of hose reels 3 around which the mixed gas supply hose 2 is wound are provided, and the respiratory mask 1 is attached to the tip of the mixed gas supply hose 2. Therefore, the worker wearing the respiratory mask 1 breathes the mixed gas supplied from the outside via the mixed gas supply pipe 4 through the mixed gas supply hose 2 wound on the hose reel 3. . The compressed air supply pipe 10 is also provided in the working chamber 13 below the floor slab 12 of the box 11 to raise the atmospheric pressure.
When working in the work chamber 13, when the worker descends into the work chamber 13, the hose reel 3 is automatically moved according to the movement of the worker.
The mixed gas supply hose 2 is unraveled and extends, and the work can be freely performed in the working chamber 13 while the respiratory mask 1 is attached. or,
If you give a slight pulling shock to the mixed gas supply hose 2,
The hose reel 3 has a structure capable of automatically winding the mixed gas supply hose 2. When the work is completed, the worker is allowed to use the mixed gas supply hose 2 connected to the breathing mask 1.
Ascending to the man lock 5 while winding the mandrel 5 around the hose reel 3, the man lock 5 and the working chamber 13 are cut off, the inside of the man lock 5 is depressurized to about 3 kg / cm ² G, and then the worker wears the respirator And breathe air until manlock 5 is opened to atmospheric pressure.

FIG. 2 shows the lower trunk 1 under the manlock 5.
8 is a view showing an example in which the hose reel 3 is provided in the lower trunk 18 and the hose reel 3 is provided. Since the manlock 5 is narrow, the lower trunk 1 is placed under the manlock 5 to improve work efficiency.
8 is provided, and the hose reel 3 is installed on the lower trunk 18. The operator connects the intake pipe 14 of about 5 m provided in the respiratory mask 1 to the plug of the mixed gas sampling plug 15 of the manlock 5 until the air pressure of the manlock 5 reaches a predetermined pressure from about 3 kg / cm ² G. Breath mixed gas. After that, the operator descends to the lower trunk 18, connects the intake pipe 14 to the plug of the mixed gas supply hose 2 extending from the hose reel 3 installed in the lower trunk 18, and descends to the working chamber 13.

[0026]

The effects of the present invention are as follows.

(A) When carrying a mixed gas cylinder on its back, unloading it, starting work in the work chamber, or every time the work is finished, the mixed gas line attached to the mixed gas supply pipe supplied from the outside The inhalation tube of the breathing mask is connected to the plug and changed, which avoids the inconvenience of breathing compressed air many times in a short time.

(B) The work efficiency can be improved because the labor of changing the connection of the intake pipe plug can be saved.

(C) Since it is not necessary to move the man shaft while carrying the mixed gas cylinder on the back, work efficiency is improved.

[Brief description of drawings]

FIG. 1 shows a man-lock 5 near the floor slab 12 of the Zen box 11.
Is a diagram showing an embodiment of the breathing apparatus of the present invention in the case 11 in which the elevator 7 moves up and down inside the man shaft 6 connected to the man lock 5.

[FIG. 2] A lower trunk 18 is provided below the man lock 5,
It is a figure which shows the example which installed the hose reel 3 in the lower trunk 18.

FIG. 3 is a diagram showing an example of a conventional mixed gas breathing method.

[Explanation of symbols]

1 ... Breathing mask, 2 ... Mixed gas supply hose, 3
... Hose reels, 4 ... Mixed gas gas pipes, 5 ...
・ Man lock, 6 ... Man shaft, 7 ... Elevator, 8 ... Material lock, 9 ... Material shaft, 10 ... Compressed air supply pipe, 11 ... Zhan box, 12.・ Floor slab, 13 ... Work room, 14 ...
・ Intake pipe, 15 ... Mixed gas sampling plug, 16 ...
Mixed gas cylinder, 17 ... Mixed gas line plug,
18 ... Lower trunk

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Kanda 3-5-11 Nihonbashihonmachi, Chuo-ku, Tokyo Joint Building 5F, Omotogumi Co., Ltd.

Claims (1)

[Claims] 1. A mixed gas gas supply pipe, a mixed gas supply hose having a plurality of branches at the tip of the mixed gas gas supply pipe and having flexibility, and a breathing mask at the end of the mixed gas supply hose. The connected mixed gas supply line and the mixed gas supply hose are always wound up on a hose reel and automatically expand when a tensile force is applied, and a slight tensile impact is applied to the hose reel when stretched. A mixed gas breathing apparatus at the time of working under high pressure, characterized by comprising a hose reel having means for generating a winding force.