JP2723561B2 - Structure level correction device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a level correcting device for a structure constructed on soft ground or the like.

(Conventional technology) When constructing a structure such as a building on soft ground such as a landfill, a construction method has conventionally been adopted in which a long concrete pile is driven deep into the ground to reach a bedrock to solidify the foundation of the structure.

However, recently, a floating foundation method which can be constructed at a lower cost than the pile driving method has begun to be widely adopted.

The floating foundation literally supports the structure in a state where the foundation of the structure is floating in the ground. As shown in FIG. 6, the floating foundation is formed by a box-shaped foundation 20 like a ship. It supports the weight of the structure 30 that balances with the weight.

However, the floating foundation 20 undergoes differential settlement, in which the soft ground partly sinks until the ground softens as time passes, so that the structure 30 may be partially deformed or cracked. Was.

(Problem to be Solved by the Invention) In order to correct the level of the squat portion, the deformed floating foundation is left as it is, and it is possible to separate it from the structure built on it in advance, Modifications were made to keep the structure level by jacking up the floor of the structure.

However, since this level correction relies exclusively on manual work by humans, it is very difficult to measure the level by sneaking under the floor of the structure or jacking up while carrying the hydraulic jack, especially when the structure is large. Had to be taken.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem by providing an apparatus which detects a level fluctuation of a structure and automatically corrects the level when the level fluctuation occurs.

[Means for solving the problem]

Therefore, the present invention provides a large number of lifting and lowering driving means for supporting the structure with respect to the floating foundation, and a means for measuring the level of the structure of each of these supporting portions, and the detection level is determined from a preset reference plane. Is provided, and a control means is provided for driving each of the elevation drive means to expand and contract so that the relative displacement becomes substantially zero.

A reference manometer that detects a liquid level at a reference position of a structure and a displacement manometer that is attached to each jack support of the structure and detects a predetermined liquid level are connected to a conduit connected by a communication pipe. A control means for injecting and draining water is provided so that the liquid level becomes constant, and the jack of the displacement manometer installation site is driven to expand and contract in accordance with the output of the displacement manometer.

(Operation) Therefore, in the structure supported by the lifting drive means with respect to the floating foundation, when the level of each support portion fluctuates, the relative displacement with respect to the reference level is detected,
Lift up or down is performed so that this displacement becomes zero. Therefore, the deformation of the structure caused by the uneven settlement of the floating foundation can be reliably prevented.

In addition, by installing a displacement manometer on each jack support and connecting it to the reference manometer with a communication pipe, it is possible to immediately detect the level fluctuation of each jack support, and expand and contract the jack at the corresponding part By driving, accurate level correction can be performed automatically. In addition,
Even if the level fluctuation of the jack support portion is caused by an oil leak that cannot be avoided when a hydraulic jack or the like is used, it can be similarly compensated.

(Example) An example of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a structure 30 built on a floating foundation 20 is supported by a plurality of hydraulic jacks 22. These hydraulic jacks 22 are installed at each intersection 21 of the floating foundation 20 arranged vertically and horizontally, and the structure 30
(See FIG. 3).

In order to measure the level of the structure 30, a reference manometer 1 installed at a predetermined reference position of the structure 30 and each jack 22
A displacement manometer 2 attached to the foundation beam 31 is provided at each of the support portions where the base is installed. These are connected to each other by the communication pipe 3 and the level of the liquid (water) supplied to this pipe is described later. Water injection valve 4 and drain valve 5
Is always adjusted to a certain level by opening and closing.

As shown in FIG. 2, the reference manometer 1 includes a liquid level sensor 7 for detecting a reference liquid level, whereas each displacement manometer 2 outputs an output when the liquid level reaches a predetermined level. A level sensor 8 is provided, and an upper limit sensor 9a and a lower limit sensor 9b for detecting upper and lower positions of the liquid level, respectively.

The signals from each sensor 7, 8, 9a, 9b are
To enter.

The controller 10 is composed of a microcomputer or the like that performs arithmetic processing of these input signals, and operates the water injection valve 4 or the drain valve 5 based on the arithmetic result so that the liquid level measured by the sensor 7 becomes constant.

Further, as shown in FIG. 3, the controller 10 switches the electromagnetic switching valve 23 for controlling the supply and discharge of the hydraulic oil to and from the jack 22 so that the level detected by each sensor 8 matches the reference level. Operate to extend and retract jack 22.

By switching the electromagnetic switching valve 23, the hydraulic chamber 24 is selectively connected to the oil chambers 22a and 22b inside the jack 22, and the hydraulic oil is supplied. That is, the jack 22 expands by sending pressure oil to the lower oil chamber 22a, and contracts when pressure oil is sent to the upper oil chamber 22b. The pressure of the hydraulic oil to be supplied is adjusted to a constant value by the pressure control valve 25, and throttles 26b are interposed in parallel with the check valves 26a in each circuit to control the speed at which the jack 22 contracts. You. Reference numeral 27 denotes a pilot operated check valve which is closed in a normal holding state to prevent the jack 22 from contracting, but is opened by pilot pressure when the jack is lowered to allow contraction.

The operation will be described with reference to the flowcharts of FIGS. 4 and 5, which are configured as described above.

In the initial state, the displacement manometers 2 mounted on the structure at the support portions of the jacks 22 are installed so as to be at the same level as each other, and the reference level of the reference manometer 1 installed at a predetermined reference position. Is also set to match.

The controller 10 controls the liquid level so that the liquid level detected by the reference manometer 1 is always at the reference level.

FIG. 4 is a flow chart of the liquid level control. It is determined whether the liquid level detected by the reference manometer 1 is above or below the reference level. If it is, the drain valve 5 is opened and the liquid level is lowered. (Steps 50 to 52). It is determined whether the liquid level that has dropped has reached the reference level (Step 5).
3) Repeat the same operation until it reaches. When the reference level is reached, the drain valve 5 is closed (step 54).

On the other hand, if the detected liquid level is lower than the reference level, the water injection valve 4 is opened to raise the liquid level (steps 55 and 56). Then, in step 57, it is determined whether or not the liquid level has reached the reference level, and the same operation is repeated until the liquid level is reached. When the liquid level reaches the reference level,
Is closed (step 58).

In this way, a constant liquid level is maintained at all times, thereby avoiding the occurrence of measurement errors due to the liquid level fluctuation due to the level fluctuation of each measurement site or the evaporation.

When there is no level change at the measurement site where the displacement manometer 2 is installed, each displacement manometer 2 also outputs that the liquid level is at the reference level. On the other hand, when a level change occurs, the output of the displacement manometer 2 at that portion changes, that is, when the liquid level rises above the reference level due to the sinking of the floating foundation 20, or in the opposite case, falls, Outputs either up or down according to.

When there is a level change in the liquid level, the hydraulic jack 22 at the corresponding measurement site is operated to correct the level.

FIG. 5 is a flowchart of level correction. In step 60, it is determined from the output of each displacement manometer 2 whether the liquid level is above or below a reference level. When it is detected that the liquid level is above, it is because the foundation of that part is sinking, and the electromagnetic switching valve 23 is operated in a direction to raise the jack 22 (step 61).

After the jack-up, the output of the lower limit liquid level sensor 9b is checked to determine whether or not the liquid level has reached the lower limit (step 62). If the level is abnormally increased due to a malfunction of the jack-up or the like, this is immediately alerted and the extension / retraction operation of the jack 22 is stopped (steps 67 and 68).

If there is no abnormality, it is determined in step 63 whether the liquid level has reached the reference liquid level, and jack-up is repeated until the liquid level drops to the reference liquid level. When the reference liquid level is reached, the operation of the jack 22 is stopped.

Also, in step 60, when the detected liquid level is lower than the reference level, that is, when the level of the measurement site is too high, the electromagnetic switching valve 23 is switched in the direction of lowering the jack 22, and the upper limit liquid level is further increased. It is determined from the output of the sensor 9a whether the jack is operating normally (steps 64 and 65).
In the event of an abnormality, an alarm is output and stopped as described above.

Under normal conditions, the jack 22 is lowered until it rises to the reference liquid level (step 66), and when the reference liquid level is reached, the jack operation is stopped.

In this way, the jack 22
To adjust the level, so that the entire structure 30
Distortion can be completely and automatically prevented.

When jacking up, the upper and lower liquid level sensors
Since the outputs of 9a and 9b are monitored, it is possible to prevent the level from being excessively corrected due to abnormal operation of the jack 22, etc., and to ensure the safety of the system. Even if this level fluctuation is caused by a slight oil leak of the hydraulic jack 22 supporting the foundation beam 31,
The same can be compensated.

By the way, the level correcting operation in the present invention is performed while observing the relative level difference between the portion where the displacement manometer 2 is installed and the portion where the reference manometer 1 is installed. The level is not corrected, and the jack 22 keeps its stroke position. Therefore, unlike the case where the level is corrected based on the absolute reference position (height), the effective stroke amount of the jack 22 does not need to be so large. In other words, the effective stroke amount of the jack 22 is
The maximum value of the relative displacement amount in each part of the floating foundation which is experimentally obtained in advance may be determined as a guide. Therefore, the jack as the lifting drive means
22 may be relatively small.

Note that various lifting / lowering driving means such as an electric motor and a screw jack can be used instead of the hydraulic jack 22.

(Effects of the Invention) As described above, according to the present invention, the level is automatically corrected while detecting the level of each part of the structure supported on the floating foundation, so that the correction for uneven settlement can be performed with full automatic accuracy. It can be performed well, and the maintenance of the structure becomes very easy.

In addition, since the level correction is performed not by measuring the absolute level position of the structure but by detecting the relative displacement difference, the effective stroke amount of the lifting drive means is also limited by the relative level variation range of the floating foundation. It suffices if the inside can be covered, so that downsizing of the device can be achieved.

The level correction is feedback control based on the actual level fluctuation, so not only the differential settlement of the floating foundation but also the position fluctuation of the elevation drive means itself (leak operation)
Can also be compensated for.

[Brief description of the drawings]

1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a level measurement portion, FIG. 3 is a cross-sectional view of a lifting drive portion, FIG. 4 is a flowchart of liquid level control, and FIG. FIG. 6 is a sectional view showing a floating basic structure. 1 ... reference manometer, 2 ... displacement manometer, 4 ...
Injection valve, 5 ... Drain valve, 7, 8, 9a, 9b ... Sensor, 10 ...
Controller, 20: Floating foundation, 22: Hydraulic jack, 23: Solenoid switching valve, 30: Structure, 31: Foundation beam.

Claims (2)

(57) [Claims] A plurality of lifting / lowering driving means for supporting a structure with respect to a floating foundation are provided, and means for measuring the level of the structure at each of these support portions are provided. A level correcting device for a structure, comprising: means for detecting a relative displacement of each of the first and second moving means; A reference manometer for detecting a liquid level at a reference position of the structure and a displacement manometer attached to each jack support of the structure for detecting a predetermined liquid level are connected by a communication pipe. A control means for injecting and draining water so that the liquid level of the reference manometer is constant in the pipeline, and the jack of the displacement manometer installation portion is configured to be driven to expand and contract according to the output of the displacement manometer. The structure level correcting device according to claim 1, wherein: