JPH0323719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to the structure of a shaft for discharging shear (excavation soil) found in shield construction methods etc. using a bucket or the like.

<Conventional technology> Generally, in the shield construction method, the earth and sand excavated at the face at the tip of the tunnel are loaded onto trolleys, transported to the starting shaft, and stored in a shear pit installed adjacent to the work area at the bottom of the shaft. The method used is to scoop up the accumulated shear with a grab bucket, lift it up with a hoist on the ground, and discharge it to the surface near the shaft. Conventionally, the area around the bucket lift space of the shaft is protected from falling objects by a vertically extending cylindrical net.

<Problems to be Solved by the Invention> However, the above-mentioned cylindrical net has almost no protective effect against minute shears, and there is no falling object protection means in the workplace around the shear pit at the bottom end of the net where the bucket scoops up the shear. There is no such thing. Therefore, while the bucket is being hoisted up by a hoist and the shear is being carried out, the shear that spills from the bucket will concentrate and fall around the pit, creating a dangerous situation. The disadvantage is that you cannot perform other tasks such as moving to another location.
In particular, as the shaft gets deeper, not only does the speed of falling shear increase, making it even more dangerous, but it also takes a long time to raise and lower the bucket, resulting in longer interruptions to other work in the workplace around the shear pit. As a result, work efficiency will further decline.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a means for effectively blocking the flying and falling of shear spilling from a bucket being lifted and a means for preventing falling into the shear pit, so that other operations around the pit can be carried out simultaneously during lifting work. The purpose is to provide a shaft structure that allows safe operation.

<Means for Solving the Problems> In order to achieve the above object, the structure of the shaft of the present invention has a working place and a shear pit at the bottom, and a shaft for lifting up from the shear pit to the ground using a bucket. A ceiling that can be opened and closed to cover the slide pit is provided above the workshop, and a handrail is hung from the end of the ceiling on the slide pit side, so that when the ceiling is opened, the handrail will be at the boundary between the workshop and the slide pit. In addition, a partition plate is provided above the ceiling to separate the work space and the bucket lift space.

<Operation> When the bucket, which has been emptied by discharging the shear on the ground, descends inside the shaft, the retractable ceiling installed in the upper space of the workshop at the bottom of the shaft opens, and the bucket can be moved to the bottom of the shaft. It reaches the shear pit, scoops up the accumulated shear, and ascends back toward the ground. During this time, the handrail suspended from the end of the ceiling was located at the boundary between the work area and the slip pit.
Prevents workers from falling into slip pits. The ceiling closes to cover the shear pit when the bucket which accommodates the shear and ascends passes therethrough, and the working space is partitioned from the bucket lift space by the ceiling and the partition plate. Also, a handrail suspended from the end of the ceiling moves from the boundary at one end of the shear pit to the other end. This completely blocks debris falling from the rising bucket from flying into the work space, and allows other work to be carried out at the same time, such as overturning the trolley and moving debris from the border without handrails to the shear pit. It can be done safely.

<Examples> Hereinafter, the present invention will be explained in detail with reference to illustrated examples.

Fig. 1 is a longitudinal sectional view of the shaft, and Fig. 2 is a - sectional view of Fig. 1, where 1 is a retaining wall forming the side wall of the shaft and has a rectangular cross section, and 2 is a pit provided at the bottom of the shaft. , 3 is a working floor provided along this shear pit 2, 4 is a tunnel excavated horizontally from this working floor 3, and 5 is a shear 7 running on a rail 6 laid on the working floor 3 and tunnel 4. 8 is a pair of rail supports horizontally suspended above the tunnel 4 of the shaft; 9 is a movable ceiling that moves on the rail 10 provided on the rail support 8 to open and close the shear pit 2; 11 is a movable ceiling above the ground; A gate-shaped frame erected so as to straddle the shaft, 12 a hoist running on the crossbeam 13 of this frame 11, 14 suspended from this hoist 12 via wires 15, 15 so as to be able to rise and fall freely, and a shear pit 2 A bucket 16 is a partition steel plate that separates the space above the movable ceiling 9 where the bucket 14 moves up and down from the space above the work floor 3.

The pair of rail receivers 8, 8 have their front and rear ends in contact with the earth retaining wall 1 connected to the H-shaped steel 1, respectively, as shown in FIG.
7 and 17, and horizontally supported by brackets 18 and 18 protruding from the retaining wall 1, as shown in FIG. Wheels 20 rotated by a motor 19 are attached to the lower surface of the movable ceiling 9 at the four corners, and I-shaped rails 21, 21 for handrails extending parallel to the rails 10 are attached inside the wheels 20. A carrier 24 having a pair of wheels 23 rotationally driven by a motor 22 with a clutch is movably attached to each of the rails 21, and a handrail 26 is suspended from the carriers 24, 24 via hanging tools 25, 25. ing. This handrail 26 surrounds the edge of the work floor 3 on the slide pit 2 side in a U-shape, and includes vertically movable pins 27, 27 provided on the lower surface of the corner, and pin insertion pipes 28 provided on both ends of the edge. , 28 and fixed. The hoist 12 includes a pair of hoisting drums 3 that are simultaneously driven by a motor 29.
The front and rear wires 15, 15 having the same length and having the same length for suspending the bucket 14 have one end fixed to the hoist body and the other end wound around each hoisting drum 30. Above partition steel plate 1
In the space on the work floor 3 side, which is divided approximately in half by 6,
A ladder 31 reaching the ground is installed vertically, and a lid steel plate 32 covering the upper end of the space is provided with an entrance 33 that can be opened and closed. When the movable ceiling 9 comes into contact with the stopper 34 at one end of the rail 10, the partition steel plate 16
The opening on the slide pit 2 side at the lower end is fully closed, and the opening is dimensioned to fully open when it comes into contact with the stopper 34 at the other end.

Work is carried out in the shaft constructed as described above as follows.

When the bucket 14, which has been emptied by opening the grab on the ground and discharging the shear, is lowered into the shaft by the hoist 12, the movable ceiling 9 moves on the rail 10 until it touches the stopper 35 at the other end. The upper part of the shear pit 2 is fully opened, and the bucket 14 passes through it and reaches the shear pit 2 at the bottom of the shaft. Next, the bucket 14 closes its grab, scoops up the accumulated waste 7, and is again hoisted to the ground by the hoist 12. The above moving ceiling 9
When the rising bucket 14 passes, it moves on the rail 10 again to the position where it comes into contact with the stopper 34 at one end, completely closing the upper part of the shear pit 2, and closing the work floor 3.
The upper work space has the movable ceiling 9 and the partition steel plate 16.
completely cut off from the bucket lift space. As a result, the work space is completely protected from flying debris falling from the ascending bucket 14, and the worker can overturn the trolley 25 on the work floor 3 and carry it from inside the tunnel 4. Work such as putting the droplet 7 into the droplet pit 2 can be performed safely. A handrail 26 movably suspended from a rail 21 on the lower surface of the movable ceiling 9
moves together with the movable ceiling 9 unless the motor 22 is driven. Therefore, when shear is constantly being loaded into the shear pit 2 on the work floor 3, if the handrail 26 is parked at the position shown in FIG. 3 and prevents the worker from falling into the shedding pit 2 without interfering with the descent of the bucket 14, and when the movable ceiling 9 is closed, it moves away from the edge as shown in the figure and prevents the shedding from being thrown in. do not become. When performing work other than shearing on the work floor 3, the motor 22 is driven to move the handrail 26 to the edge of the work floor 3, and the pins 27, 27 of the handrail 26 are connected to the pins at both ends of the edge. After inserting into the insertion pipes 28, 28 and fixing the handrail 26 to the work floor 3, the clutch of the motor 22 is disconnected. Then, the handrail 26 surrounds the edge regardless of the movement of the movable ceiling 9, prevents the worker from accidentally falling into the slip pit 2, and does not obstruct the bucket 14. Furthermore, if shearing is required at this time, the pins 27, 2
7 and drive the motor 22 to move the handrail 26 to the retaining wall 1 on the slide pit 2 side.

In the embodiment described above, the handrail 26 is movably suspended from the lower surface of the movable ceiling 9 by the carrier 24, so if necessary, the handrail 26 can be used to surround the edge of the work floor 3 and access the slide pit 2. Prevents workers from falling.

In addition, in the above embodiment, there is a bucket 14 on the work floor 3.
If a warning device such as a buzzer or rotating light is installed to indicate the lowering of the hoist, and a similar alarm device is installed at the hoist operation location on the ground to indicate work on the work floor 3, lifting work using the bucket 14 can be done simultaneously. This makes it possible to work more safely on the working floor 3 at the bottom of the shaft. Further, if the shaft is not very deep, the partition plate can be provided horizontally as shown by the broken line 36 in FIG.

<Effects of the Invention> As is clear from the above explanation, the structure of the shaft of the present invention has a working place and a shear pit at the bottom, and the above-mentioned working place of the shaft is used for lifting from the shear pit to the ground using a bucket. A ceiling that can be opened and closed to cover the slide pit is provided in the upper space of the ceiling, and a handrail is suspended from the end of the ceiling on the slide pit side, so that when the ceiling is opened, the handrail is located at the boundary between the work area and the slide pit. At the same time, there is a partition plate above the ceiling that separates the work space from the bucket lift space, so that the ceiling and partition plate prevent spills from falling from the bucket hoisted to the ground into the work space. The handrail prevents workers from falling into the slip pit, allowing work such as dropping slips into the slip pit to be carried out safely at the same time during lifting work.
Work efficiency is significantly improved by eliminating work interruptions, and this effect is especially noticeable in deep shafts.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the structure of the shaft of the present invention;
FIG. 2 is a cross-sectional view taken from FIG. 1. 1...Earth retaining wall, 2...Slip pit, 3...Working floor, 4...Tunnel, 5...Trolley, 7...Slip, 8...Rail support, 9...Moving ceiling, 10...
...Rail, 11... Frame, 12... Hoist, 1
4...Bucket, 15...Wire, 16...Partition steel plate, 19...Motor, 20...Wheel, 21...
...Rail, 22...Motor, 23...Wheel, 24
...carrier, 26...handrail, 27...pin, 2
8...Pin insertion pipe.

Claims (1)

[Scope of Claims] 1. In a shaft having a workshop and a shear pit at the bottom, and in which shears are lifted from the shear pit to the ground by a bucket, a ceiling that can be opened and closed to cover the shear pit is provided above the workshop, and this ceiling A handrail is hung from the end of the sliding pit so that when the ceiling is opened, the handrail is located at the boundary between the work area and the sliding pit, and a working space and a bucket lift space are connected above the ceiling. A vertical shaft structure characterized by the provision of partition plates.