JP4415234B2 - Caisson bottom door opening and closing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention closes the manhole on the bottom shaft of the caisson in order to exhaust the compressed air in the shaft to atmospheric pressure while keeping the pressure in the working chamber constant when manlock is fitted (shaft addition). The present invention relates to a bottom door opening and closing device.
[0002]
[Prior art]
As is well known, in the caisson work, manlock a, material lock b, and shaft c are added as shown in FIG.
[0003]
When the shaft c is transferred during the pressure work, the work chamber (box) of the case d is not cut off, but only the inside of the shaft is cut off and the transfer is performed under atmospheric pressure. The manhole of the manlock shaft e is hermetically sealed with a bottom door, the work chamber and the shaft c are shut off, and only the inside of the shaft is cut off.
[0004]
Various devices have been conceived for the opening / closing device for the bottom door, but there has been no device having a simple structure and easy opening / closing operation.
[0005]
[Problems to be solved by the invention]
Accordingly, the present invention is intended to provide a bottom door opening and closing device that is simple in structure and easy to open and close.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and the first invention is that guide rails are provided on both sides of a lower part of a manhole provided on a floor plate in a bottom shaft, and wheels running on the guide rails are moved back and forth. The provided bottom door is provided in the lower part of the manhole, and the guide rail is inclined upward in the closing direction of the bottom door, and the mounting position of the axle on the closing direction side is set according to the inclination angle. This is a caisson bottom door opening / closing device provided at a higher position than the mounting position.
[0007]
Further, the second invention is provided with guide rails on both sides of the lower part of the manhole provided on the floor plate in the bottom shaft, a bottom door provided with front and rear wheels running on the guide rail is provided at the lower part of the manhole, and Caisson bottom door characterized in that the guide rail is inclined upward in the closing direction of the bottom door, and the diameter of the wheel on the closing direction side is made smaller than the diameter of the wheel on the opening direction side according to the inclination angle. Opening and closing device.
[0008]
According to a third aspect of the present invention, there is provided a caisson bottom door opening / closing device according to the first and second aspects of the present invention, further comprising an axle position adjusting device for adjusting the position of the axle of the bottom door moving wheel in the vertical direction.
[0009]
[Action]
The opening / closing device for the bottom door according to the present invention is such that the bottom door is lowered and separated from the lower surface of the manhole at the open position, but when it is closed, it is raised and contacts the lower surface of the manhole, and the bottom door is closed when manlock is installed. When the compressed air in the shaft is exhausted, the bottom door adheres to the lower surface of the manhole due to the pressure difference between the inside and outside due to the pressure difference, and when the compressed air is injected into the shaft after the shaft is added, the guide rail is inclined, so the bottom door is lightly Can be released.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
2 to 9 show a first embodiment of the present invention, FIG. 2 is a plan view of a manlock bottom shaft e, FIG. 3 is a bottom view thereof, FIG. 4 is a longitudinal front view in which a stay is omitted, FIG. 5 is an enlarged vertical side view of FIG. 6, FIG. 6 is an enlarged vertical front view of part A showing the axle position adjusting unit, FIG. 7 is an enlarged plan view of the locking device when the bottom door is closed, and FIG. FIG. 9 is an enlarged longitudinal sectional view showing the stopper when the bottom door is opened, and FIG. 10 is a diagram for explaining the principle and operation of the embodiment.
[0011]
2 to 9, reference numeral 1 denotes a manhole biased on the floor plate 2 of the bottom shaft e, 3 and 3 are U-shaped guide rails provided on both sides of the lower part of the manhole, and the manhole side is inclined slightly higher. It is provided.
[0012]
4 is a cart of a bottom door 6 provided with wheels 5, 5, 5, and 5 that run on the guide rails 3 and 3 in the front-rear direction (left and right in FIGS. 2 to 4). The bottom door 6 is an axle position adjusting device 7, 7 , 7, 7 to the carriage 4.
[0013]
As shown in FIG. 6, the axle position adjusting device 7 is composed of a bolt 7a and a nut 7b screwed to the carriage 4 of the bottom door 6. By adjusting the bolt 7a and the nut 7b, the axle position adjusting device 7 is adjusted from the carriage 4 of the bottom door 6. The height, that is, the position of the axle of the wheel of the bottom door 6 can be adjusted in the vertical direction.
[0014]
The adjustment by the axle position adjusting device 7 is performed when the upper surface of the bottom door 6, that is, the upper surface of the packing 6a in the embodiment is parallel to the lower surface of the seat 1a of the manhole 1 and the bottom door 6 is moved to close the manhole 1. Adjustment is made so that the packing 6a contacts the seat 1a.
[0015]
That is, the upper surface of the bottom door 6 moves substantially parallel to the lower surface of the receiving seat 1a of the manhole 1 as the carriage 4 moves, and is adjusted so that it is separated from the lower surface of the receiving seat 1a in the closed position, although it is separated at the open position. To do.
[0016]
Reference numeral 8 denotes a locking lever that is pivotally attached to the upper edge of the mouth of the manhole 1. A receiving metal fitting provided on the bottom door 1 with a locking pin 9 of the bottom door 1 that is detachably attached to the tip when the bottom door 1 is closed. The bottom door 1 is configured to be locked at the closed position by inserting the engaging hole 6c of 6b.
[0017]
Reference numerals 10 and 11 are stoppers when the bottom door is opened. The stopper 10 is provided on the bottom door 1, and the stopper 11 is provided on the floor plate 2. Reference numeral 12 denotes a handle provided on the bottom door 1 used when the bottom door 1 is opened and closed.
[0018]
Next, the basic principle and operation of the apparatus of this embodiment will be described with reference to the principle explanatory diagram of FIG. 10. In this apparatus, the guide rail 3 is slightly inclined with respect to the lower surface of the seat 1 a of the manhole 1 by an angle α. Further, the distance (position) of the axle from the bottom door 6 is made short on the manhole 1 side so that the bottom door 6 moves in parallel with the seat 1a of the manhole 1, so that the bottom door 6 is opened when the door is opened. Although it is in the lowered position, the bottom door 6 comes into contact with the seat 1a of the manhole 1 when it is moved up in the direction of the manhole 1 and closed.
[0019]
Accordingly, when the bottom door is closed, as shown in FIG. 8, the locking pin 9 is inserted into the engagement hole 6c of the receiving bracket 6b provided on the bottom door 6, and the movement of the bottom door 6 due to its own weight in the door opening direction is stopped. When the compressed air in the shaft is exhausted, the bottom door 6 comes into close contact with the seat 1a of the manhole 1 due to the atmospheric pressure in the caisson working chamber, and the working chamber is hermetically sealed. Then, after finishing the fitting, when the compressed air is supplied into the shaft and the locking pin 9 is pulled out, the guide rail 3 is inclined, so that the door is opened by its own weight or by lightly pushing the bottom door 6. Can do. That is, according to this method, the opening / closing operation can be simplified.
[0020]
FIG. 11 shows the principle and basic configuration of the second embodiment. In this case, unlike the first embodiment, instead of changing the vertical position of the front and rear axles 13, 14 with respect to the bottom door 6, FIG. The diameter of the wheel 51 on the closing direction side is made smaller than the wheel 52 on the opening direction side according to the inclination angle of the guide rail 3.
[0021]
Also in this case, the bottom door 6 is separated from the lower surface of the seat 1a of the manhole 1 when the door is opened, and comes into contact with the lower surface of the seat 1a of the manhole 1 when the door is closed. Obtainable.
[0022]
Although two embodiments have been described above, the axle position adjusting device 7 can be omitted if the manufacturing accuracy is good. Moreover, although the axle position adjusting device 7 is provided in the cart 4, the bearing may be attached to the bottom door 1 via an arbitrarily configured axle position adjusting device.
[0023]
【The invention's effect】
As apparent from the above description, according to the present invention, it is possible to provide a simple bottom door opening / closing device that has a simple structure and can be opened and closed.
[Brief description of the drawings]
FIG. 1 is a diagram showing the situation of caisson construction.
FIG. 2 is a plan view of a manlock bottom shaft e in the first embodiment.
3 is a bottom view of the manlock bottom shaft e shown in FIG. 2. FIG.
4 is a longitudinal front view in which a stay of the manlock bottom shaft e shown in FIG. 2 is omitted. FIG.
5 is a longitudinally enlarged side view of the manlock bottom shaft e shown in FIG. 2. FIG.
6 is an enlarged vertical sectional front view of a part A in FIG. 4 showing an axle position adjusting part.
FIG. 7 is an enlarged plan view of the locking device when the bottom door is closed in the first embodiment.
FIG. 8 is an enlarged front view of a B section in FIG. 4;
FIG. 9 is an enlarged longitudinal sectional view showing a stopper when the bottom door is opened in the first embodiment.
FIG. 10 is an explanatory diagram showing the principle and schematic configuration of the first embodiment.
FIG. 11 is an explanatory diagram showing the principle and schematic configuration of a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Manhole 2 Floor board 3 Guide rail 4 Cargo 5 Wheel 6 Bottom door 7 Axle position adjusting device 8 Latching lever 9 Locking pin 10, 11 Stopper 12 Handle 13, 14 Axle

Claims (3)

Guide rails are provided on both sides of the lower part of the manhole provided on the floor plate in the bottom shaft, a bottom door provided with front and rear wheels running on the guide rail is provided at the lower part of the manhole, and the guide rail is disposed in the closing direction of the bottom door. A caisson bottom door opening / closing device characterized in that the mounting position of the axle on the closing direction side is provided higher than the mounting position of the axle on the opening direction side according to the tilt angle. Guide rails are provided on both sides of the lower part of the manhole provided on the floor plate in the bottom shaft, a bottom door provided with front and rear wheels running on the guide rail is provided at the lower part of the manhole, and the guide rail is disposed in the closing direction of the bottom door. headed with tilting upwards, caisson Botomudoa switchgear, characterized in that is smaller than the diameter of the vehicle wheel opening direction side diameter of the vehicle wheel the closing direction in accordance with the inclination angle. 3. The caisson bottom door opening / closing device according to claim 1, further comprising an axle position adjusting device for adjusting the position of the axle of the bottom door moving wheel in the vertical direction .

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