JP2746956B2 - 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 An object of the present invention is to solve the above-mentioned problem by providing a device that detects a level fluctuation of a structure and automatically corrects the level when the level fluctuation occurs.

(Means for Solving the Problems) Accordingly, the present invention provides a method for supporting a structure on a floating foundation via a number of jack devices, while ensuring that the liquid level at a reference position of the structure is within a predetermined range. A reference manometer to be detected and a displacement manometer attached to each jack support of the structure and detecting a liquid level in a predetermined range are connected by a communication pipe, and the liquid level of the reference manometer is fixed to the communication pipe. Liquid level control means for injecting and draining water so as to fall within the range is provided, and level control means for expanding and contracting the jack device so that the detection liquid level of each displacement manometer falls within a predetermined range.

(Operation) Therefore, when a structure supported by the jack device with respect to the floating foundation causes a change in the level of each support portion, a relative displacement with respect to a reference level range is detected, and the lift is set so that this displacement becomes zero. Up or down is performed. Therefore, the deformation of the structure caused by the uneven settlement of the floating foundation can be reliably prevented.

(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 also in FIG. 2, the reference manometer 1 includes two sensors 7a and 7b as a liquid level sensor 7 for detecting that the reference liquid level is within a certain range. Each displacement manometer 2 also includes two sensors 8a and 8b as a level sensor 8 that generates an output when the liquid level reaches a predetermined level range, and further sets the upper and lower positions of the liquid level, respectively. An upper limit sensor 9a and a lower limit sensor 9b for detecting are provided.

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

The controller 10 is composed of a microcomputer or the like that processes these input signals, and based on the calculation results, opens and closes the water injection valve 4 or the drain valve 5 so that the liquid level measured by the sensor 7 falls within a certain range. .

Further, as shown in FIG. 3, the controller 10 controls the electromagnetic switching for controlling the supply and discharge of the hydraulic oil to and from the jack 22 so that the level range detected by each of the sensors 8a and 8b matches the reference level range. The switching operation of the valve 23 causes the jack 22 to expand and contract.

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 during jack lowering control 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 within the reference level range.

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 range. If the liquid level is above the reference level (both sensors 7a and 7b are on). The drain valve 5 is opened to lower the liquid level (steps 50 to 52).

It is determined in step 53 whether the lowered liquid level is within the reference level range, and the same operation is repeated until the sensor 7a is turned off and the sensor 7b is turned on. When the value falls within the reference level range (the sensor 7a is off and the sensor 7b is on), the drain valve 5 is closed (step 54).

On the other hand, when the detected liquid level is lower than the reference level range (both the sensors 7a and 7b are off), the water injection valve 4 is opened to raise the liquid level (steps 55 and 56). Then, in step 57, the liquid level is set to the reference level range (sensors 7a and 7b).
) Is determined, and the same operation is repeated until it is reached. When the liquid level reaches the reference level range (sensor 7a is off and 7b is on), water injection valve 4 is closed (step 58).

If it is determined in step 50 that there is a liquid level between the sensors 7a and 7b from the beginning, the control is terminated as it is.

However, these control operations are repeatedly performed at a predetermined time period.

In this way, the liquid level is always maintained within a constant level range, thereby avoiding the occurrence of a measurement error due to the liquid level fluctuation due to the level fluctuation of each measurement site or 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 within the reference level range. 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 falls reversely,
It outputs whether it is up or down accordingly.

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.

These operations are shown in the flowchart of the level correction shown in FIG.
It is determined from the output of each displacement manometer 2 whether the liquid level is above or below the reference level range.

When it is detected that the liquid level is above (both the sensors 8a and 8b are on), the electromagnetic switch valve 23 is operated in the direction of raising the jack 22 because the base of that part is sinking (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 reference liquid level range has been reached (the sensor 8a is off and the sensor 8b is on).
Repeat jack-up until the level falls to the reference level.
When reaching the reference liquid level range, the operation of the jack 22 is stopped.

In step 60, when the detection liquid level is lower than the reference level (both the sensors 8a and 8b are off), that is, when the level of the measurement site is too high, the electromagnetic switching valve 23 is moved in a direction to lower the jack 22. Is switched. Then, it is determined from the output of the upper limit liquid level sensor 9a whether or not the jack is operating normally (steps 64 and 65). If abnormal, an alarm is output and stopped as described above. The jack 22 is lowered (step 66), and when the reference liquid level is reached (the sensor 8a is off and the sensor 8b is on), 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.

Since the control is performed so that the liquid level falls within a certain level range, stable level feedback control with less control hunting is realized.

Also, when jacking up, etc., 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. Also, this level fluctuation can be similarly compensated even if it is caused by a minute oil leak of the hydraulic jack 22 supporting the foundation beam 31 itself.

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.

Various jack devices such as an electric motor and a screw jack can be used in place of the hydraulic jack 22.

(Effect of the Invention) As described above, according to the present invention, while detecting the level of each part of the structure supported by the floating foundation, the level is automatically corrected so that the level always falls within a certain level range. As a result, the level correction for the differential settlement can be automatically and accurately performed, and the maintenance of the structure built on the floating foundation becomes very easy.

In this case, the level correction is controlled so that the detection liquid level is within a certain range, so there is no hunting of the control, etc.
A stable level correction operation can be obtained.

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 jack device also indicates the relative level variation range of the floating foundation. As long as the jack device can be covered, the jack device can be downsized.

Since the level correction is a feedback control based on the actual level fluctuation, not only the uneven settlement of the floating foundation but also the height fluctuation of the jack device itself due to oil leakage or the like can be compensated.

[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 measuring circuit, FIG. 3 is a sectional view of a jack device, 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, 7a, 7b, 8a, 8b, 9a, 9b ... Sensor, 10 ... Controller, 20 ... Floating foundation,
22 ... hydraulic jack, 23 ... electromagnetic switching valve, 30 ... structure, 31 ... foundation beam.

Claims (1)

(57) [Claims] 1. A reference manometer for supporting a structure on a floating foundation via a plurality of jack devices while detecting that a liquid level at a reference position of the structure is within a predetermined range, and A displacement manometer that is attached to each jack support and detects a liquid level in a predetermined range is connected by a communication pipe, and water is injected and drained to the communication pipe so that the liquid level of the reference manometer is within a certain range. A level correcting device for a structure, comprising: liquid level control means; and level control means for expanding and contracting the jack device so that the detection liquid level of each displacement manometer falls within a predetermined range.