JPH0742710B2 - Supporting device for building structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a support control device for a structure constructed on a soft ground or a magnetic field having a high groundwater level.

(Prior art) For example, when constructing a structure on a ground with a high groundwater level, such as a reclaimed land on the coast, a rock retaining wall is generally constructed by extending it over the supporting ground below the groundwater. The structure was constructed with the groundwater in the wall drained to block the influence of the groundwater. And after construction,
In order to prevent the structure from floating due to the buoyancy of groundwater, the support weight etc., such as increasing the self weight unnecessarily large, placing earth and sand horizontally from the structure or pouring and solidifying mortar, etc., When the buoyancy became large, it was configured to support against the buoyancy by placing earth and sand on the support part or pouring and hardening mortar.

In addition, when constructing a structure on soft ground such as a landfill on the coast, generally, the structure is built by waiting for the ground in the landfill to harden to some extent, but depending on the order of landfill, the place where the landfill was completed first. The subsidence of the structure is larger than that of the one constructed later, and the subsidence is larger in the structure constructed earlier than the structure constructed later depending on the construction order. There was a problem of tilting.

Therefore, conventionally, in order to deal with such uneven settlement, jacks are provided horizontally distributed between the structure and the support ground, and the inclination of the structure is corrected by raising and lowering the jack. Was there.

(Problems to be Solved by the Invention) However, in the case of the conventional example having such a configuration, it is impossible to correct the lower portion of the elevator such as a jack, and the correction by the jack is rather the secondary member. It can also cause damage. When using underground piles,
Since the entire load of the structure is supported by the piles, if an upward force due to buoyancy is applied, the load applied to the piles will decrease, but the effect cannot be utilized by design, so the number of underground piles increases, The construction period is long and the construction cost is high.

The present invention has been made in view of such circumstances, in the ground or soft ground with a high groundwater level, the construction period is short, and while the structure can be constructed at a low cost, the building structure can be kept in a predetermined stability. The purpose is to be able to favorably support the posture.

(Means for Solving Problems) In order to achieve such an object, the support control device for a building structure according to the present invention is provided in each of the water storage tank chambers horizontally divided in the structure. A water injection device connected so that water can be injected individually, a drainage device connected so that water can be individually discharged in each of the water storage tank chambers, and the relative height of the water supply device is interposed between the underground pile and the structure. A drive lifting mechanism for changing and adjusting the displacement, a displacement sensor for detecting a vertical displacement amount of the structure with respect to the ground surface, an inclination sensor for detecting an inclination angle of the structure with respect to a horizontal plane, and a load applied to the underground pile. A load sensor for detecting, and a displacement amount control means for operating and controlling each of the water injection device and the drainage device so that the detected displacement amount falls within a set range based on the displacement amount detected by the displacement sensor. Based on the tilt angle detected by the tilt sensor, the tilt control means for operating and controlling each of the water injection device and the drainage device so that the detected tilt angle falls within a set angle range, and based on the load detected by the load sensor, It is configured to include a load elevating mechanism, load control means for controlling the operation of each of the water injection device and the drainage device so that the detected load falls within a set range.

(Operation) According to the above configuration, after the structure is constructed, when the groundwater level rises and the structure floats due to groundwater buoyancy, the displacement control means automatically operates the water injection device. Water is poured into each of the water tank chambers to give sufficient weight to the structure to suppress the structure from floating, and conversely, when the structure descends due to a decline in groundwater level or subsidence of the supporting ground, displacement control By means of the means, the drainage device is automatically operated to drain water from each of the water storage tank chambers, reduce the weight of the structure, and float the structure by groundwater buoyancy or the like by an amount equivalent to the descending amount. It can be located at a predetermined position in the vertical direction with respect to the surface.

Further, when the structure is tilted, the tilt control means automatically operates the drainage device to drain water from the predetermined water storage tank chamber on the side lowered by tilting to reduce the weight on the descending side or to inject water. The device is automatically operated, and water is poured into the designated water tank chamber on the side that has been levitated by the inclination to make the weight on the floating side heavy, and the inclination is corrected by balancing the weight of the entire structure, It can be maintained in a horizontal position.

Further, when the load applied to the underground pile increases, the load control means automatically actuates the drive elevating mechanism to weaken the supporting force for the structure, and the drainage device automatically actuates to operate the water storage tank chambers. The same amount of drainage is applied to reduce the weight of the entire structure, which reduces the load on the underground piles, and conversely, when the load on the underground piles is reduced, the drive lifting mechanism is operated by the load control means. It automatically works to increase the bearing capacity for the structure, and automatically operates the water injection device to inject equal amount of water into each water tank chamber, increasing the weight of the entire structure and using these to underground piles. The load can be increased and the load on the underground pile can be maintained at an appropriate level.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a cross-sectional view of a building structure according to an embodiment of the present invention, in which a lower portion of the structure A having a predetermined height is located in groundwater, and the structure A is supported by groundwater buoyancy.

In the base 1 below the groundwater level of the structure A, water storage tank chambers 2 are divided horizontally and provided, and a water injection device 3 and a drainage device 4 are connected to each of the water storage tank chambers 2 ... , The water storage tank chamber 2 ... Water can be supplied and drained individually to adjust the weight of the structure A and correct the inclination.

In the water injection device 3, one end of a water injection pipe 6 having a water injection pump 5 is located in groundwater, a strainer 7 is provided at the tip thereof, and a branch water injection pipe 8 is provided at the other end of the water injection pipe 6. Each of them is connected to each other and has a branch water injection pipe 8 ... Each of which has its tip located in each of the water storage tank chambers 2 ... and is configured to inject water into each of the water storage tank chambers 2 ... Using ground water, and the branch water injection pipes. 8 ... Solenoid valve 9 for water injection attached to each and opened / closed
By selecting, the water can be poured into a predetermined water storage tank chamber 2.

Further, in the drainage device 4, the branch drainage pipes 12 are connected to one end of a drainage pipe 11 having a drainage pump 10, and the branch drainage pipes 12 ... Located at the end of the strainer
The drainage pipe 11 is provided with the other end of the drainage pipe 11 located on the groundwater side, and the water discharged from the water storage tank chamber 2 is returned to the groundwater. A drainage solenoid valve 14 is attached, and the drainage solenoid valve 14 is selected to drain water from a predetermined water storage tank chamber 2.

At predetermined locations below the structure A (for example, locations near the four corners), underground piles are driven into the support ground below the groundwater.
15 are built.

As shown in FIG. 2, the upper end of the underground pile 15 is fitted into a hole 16 formed in the base 1, and a hydraulic jack 17 as a drive lifting mechanism is attached to the pile head, and an anchor bolt is attached to the base 1. The upper end of the hydraulic jack 17 is brought into contact with the reaction force base 19 attached via 18, the structure A is supported by the underground pile 15 via the hydraulic jack 17, and the structure A rotates about the horizontal axis. The first support mechanism 20 to regulate the
Is configured.

The entire structure A is configured so that it can be driven up and down by the hydraulic jack 17, and that the load applied to the underground pile 15 can be adjusted by driving the hydraulic jack 17.

A Teflon plate 21 is attached to the upper end surface of the hydraulic jack 17 that comes into contact with the reaction force base 19, and when the structure A is displaced in the horizontal direction, frictional resistance with the hydraulic jack 17 is reduced and it is displaced. It is structured to be easy.

A shock absorbing material 22 such as a sponge is attached to the entire outer surface of the lower side of the structure A so that mud can be prevented from passing therethrough and only groundwater can pass through, and elasticity can be provided. This is configured so that it can be effectively prevented by the groundwater and the cushioning material 22.

On the ground surface side of the ground around the structure A, a girder anchor 23 is constructed over the entire circumference of the structure A.
As shown in FIG. 3, 23 and the outer peripheral surface of the structure A are connected to each other via braces 24 in a state of permitting vertical displacement so that the structure A is restricted from moving in the horizontal direction. The second support mechanism 25 is configured in the. Each of the braces 24 is set to have a lower strength than the outer wall surface of the structure A, and when a large force is applied in the horizontal direction due to an earthquake or the like, the brace 24 breaks first and the impact force is applied to the structure. It is configured to prevent transmission to A.

Below the girder anchor 23, an inverted T-shaped wall 26 is formed.
Is constructed so that a dry area D is formed between the wall 26 and the structure A, and the groundwater is prevented from collapsing the surrounding ground even if the groundwater level rises sharply. ing.

Between the wall 26 and the outer wall surface of the structure A, a displacement sensor 27 for detecting the amount of vertical displacement of the structure A with respect to the surrounding ground is provided.

The base 1 is provided with an inclination sensor 28 for detecting the inclination angle of the structure A.

The structure A is provided between the hydraulic jack 17 and the reaction force base 19.
A load sensor 29 such as a load cell for detecting the load applied to the underground pile 15 is provided.

Detection signals from the displacement sensor 27, the tilt sensor 28, and the load sensor 29 are, as shown in FIG.
And a computer 33 consisting of ROM31 and RAM32,
Based on the detected displacement amount, the detected tilt angle and the detected load, as shown in FIG. 5, a displacement amount control means (M1), a tilt control means (M2) and a load control means (M3).
The control operation by each is repeated sequentially,
A drive signal is output to the water injection pump 5, the water injection solenoid valve 9 ..., the drainage pump 10, the drainage solenoid valve 14 ..., and the hydraulic jack 17 via the output circuit 34 to inject water into a predetermined water tank chamber 2 ... Drain water and hydraulic jack 17
Is driven up and down, and the structure A can be favorably maintained in a horizontal posture at a predetermined position. Next, the displacement amount control means (M1), the tilt control means (M2), and The control operation of each load control means (M3) will be described.

First, the displacement amount control means (M1) will be described.
As shown in the flowchart of the figure, the flying height detected by the displacement sensor 27 is compared with a preset first set value (F1), and when the detected flying height is larger than the first set value, the step Move to F2, water tank room 2 ...
Determine if any of them are full. Here, if there is nothing full, the process proceeds to step F3, all the water injection solenoid valves 9 ... Are opened, the water injection pump 5 is driven for a unit time, and a unit amount of water is injected to reduce the weight of the structure A. The structure A is lowered by a predetermined amount by making it heavier, and then the process returns to step F1.

When it is determined in step F1 that the flying height is smaller than the first set value, the process proceeds to step F4, and the subsidence amount detected by the displacement sensor 27 is the second set value (first set value) set in advance. Is set to the same value as or a value close to it), and when the detected settlement amount is larger than the second set value, the process proceeds to step F5, and the water tank chamber 2 is empty. Determine if there is something. If nothing is empty here, step
Move to F6, open all of the solenoid valves 14 for drainage, drive the drainage pump 10 for a unit time, perform a unit amount of drainage, and reduce the weight of the structure A by a predetermined amount. Raise and then return to step F1.

When it is determined in step F4 that the squat amount is smaller than the second set value, the process proceeds to step F7, and whether the sink amount is larger than the third set value which is set to a value smaller than the second set value in advance. Judgment is made, and the subsidence amount is the third
When it is determined that the value is larger than the set value, the process proceeds to step F8, all hydraulic jacks 17 ... Are driven to increase by a unit amount, and then the process returns to step F1.

Further, in step F5, when it is determined that the water storage tank chamber 2 is empty, the structure A cannot be raised due to the drainage from the water storage tank chamber 2,
In step F8, the structure A is raised by the unit amount by the hydraulic jack 17 as described above.

When it is determined in step F2 that there is a full water storage tank chamber 2, the structure A cannot be lowered by pouring water into the water storage tank chamber 2 ,.
Move to the control operation according to 2). In addition, the step F7
When it is determined that the subsidence amount is smaller than the third set value, the structure A is located at an appropriate position in the vertical direction, and therefore control is unnecessary and the control operation by the tilt control means (M2) is performed.

By the control operation of the displacement amount control means (M1) described above, even if the structure A floats or sinks, the water injection device 3, the drainage device 4, and the hydraulic jack 17 are operated and corrected to automatically correct the structure A. Can be positioned at an appropriate position where the detected displacement amount is within the set range.

Next, the control operation by the tilt control means (M2) will be described. As shown in the flowchart of FIG. 7, it is determined whether the detected tilt angle detected by the tilt sensor 28 is larger than a preset set angle. If it is determined (N1) and the detected inclination angle is larger than the set angle, the process proceeds to step N2, and the water storage tank chamber 2 to be drained is determined from the water storage tank chambers 2 ...

Next, it is judged whether or not all the water storage tank chambers 2 that have been indexed are empty (N3), and if any one of the water storage tank chambers 2 is not empty, the drainage solenoid valve 14 for the corresponding water storage tank chamber 2 ... Open… to drive the drainage pump 10 to drain a unit amount of water (N4), and the structure A on the side descended by the inclination
Correct the tilt by reducing the weight of and then return to step N1.

The water storage tank chamber 2 that was indexed in step N3
If it is determined that all of ... Are empty, step N5
, And the water storage tank chamber 2 to be injected is identified.

Then, it is judged whether or not all the water storage tank chambers 2 that have been indexed are full (N6), and if any of the water storage tank chambers 2 is not full, a solenoid valve for water injection to the relevant water storage chamber 2 ... 9 is opened and the water injection pump 5 is driven to inject a unit amount of water (N7), and the weight of the structure A on the side that has been levitated by the inclination is increased to end the inclination, and then return to step N1. .

The water storage tank chamber 2 that was indexed in step N6
Step N8 when you decide that everything is full ...
Then, one of the hydraulic jacks 17 ... Which should be driven is indexed, the indexed hydraulic jack 17 ... is driven up by a unit amount (N9), and then the process returns to Step N1.

In step N1, when the detected tilt angle is smaller than the set angle, the structure A is in a stable posture,
Since the control is not required, the control operation is shifted to the load control means (M3).

By the control operation of the tilt control means (M2) described above, the structure A
Even if the machine tilts, the water injection device 3, the drainage device 4 and the hydraulic jack 17 ...
Can be maintained in a stable posture in which the detected inclination angle is within a set range or is horizontal.

Finally, the control operation by the load control means (M3) will be described. As shown in the flowchart of FIG. 8, the load detected by the load sensors 29 ... Is smaller than the preset first set load. Judge whether or not (S
1) If the detected load is smaller than the first set load, the process proceeds to step S2, the corresponding hydraulic jack 17 is driven to raise the unit amount, and the supporting force for the structure A is increased to be applied to the underground pile 15. Increase the load and then return to step S1.

In step S1, if the detected load is larger than the first set load, the process proceeds to step S3 and the detected load is the second
It is determined whether or not the load is larger than the set load (larger than the first set load). If the detected load is larger than the second set load, the process proceeds to step S4, and a large load is applied to the underground pile 15, The corresponding hydraulic jack 17 is driven to lower it by a unit amount to weaken the supporting force for the structure A and the underground pile 15
The load applied to is reduced, and then the process returns to step S1.

In step S3, if the detected load is smaller than the second set load, the process proceeds to step S5 and the detected load is the third
It is determined whether the load is smaller than the set load (larger than the first set load and smaller than the second set load). If the detected load is smaller than the third set load, the process proceeds to step S6 to store water. It is judged whether or not the tank chamber 2 is full, and if there is no full one, the process proceeds to step S7, all the water injection solenoid valves 9 ... Are opened, and the water injection pump 5 is driven. By injecting a unit amount of water and increasing the weight of the structure A, the load on the underground pile 15 is increased,
After that, the process returns to step S1.

If the detected load is larger than the third set load in step S5, the process proceeds to step S8, and the detected load is larger than the fourth set load (the first and third set loads and the second set load is set). Smaller than the load), and if the detected load is larger than the fourth set load, the process proceeds to step S9 to determine whether or not there is an empty water tank chamber 2 ... If there is nothing empty, move to step S10, open all drainage solenoid valves 14 ..., drive the drainage pump 10 to drain a unit amount, and reduce the weight of the structure A. Thus, the load applied to the underground pile 15 is reduced, and then the process returns to step S1.

When it is determined in step S8 that the detected load is smaller than the fourth set load, the load applied to the underground piles 15 is determined to be proper, and the control operation by the displacement amount control means (M1) is returned to.

When it is determined in step S6 that the water tank chamber 2 is full, the weight of the structure A cannot be increased by pouring water into the water tank chamber 2, so that the control operation is returned to the displacement amount control means (M1). .

Further, when it is determined in step S9 that there is an empty water storage tank chamber 2, the weight of the structure A cannot be reduced by the drainage of the water storage tank chamber 2, so that the control operation by the displacement amount control means (M1) is performed. return.

By the control operation of the load control means (M3) described above, even if the load applied to the load from the structure A increases or decreases due to ground subsidence or fluctuation of the groundwater level, etc., the water injection device 3, the drainage device 4, and the hydraulic jack. 17 ... Each of them can be actuated and corrected, and the structure A can be naturally supported by the underground pile 15 with an appropriate load such that the detected load falls within the set range.

As described above, the control operation by the displacement amount control means (M1), the inclination control means (M2) and the load control means (M3) is repeatedly performed, and the position of the structure A in the vertical direction, the inclination angle with respect to the horizontal plane, Further, any of the loads applied to the underground piles 15 ... Can be automatically corrected to be appropriate, and the structure A can be supported in a stable posture.

As the drive lifting mechanism, instead of the hydraulic jack 17,
For example, various configurations can be adopted, such as using an electric jack or a hydraulic cylinder.

As the second support mechanism 25, each of the braces 24 ... Is configured by, for example, a member connected to the girder anchor 23 side and a member connected to the structure A side slidably expandably fitted therein. Can be modified.

As the inclination sensor 28, the displacement sensor 27 provided at a plurality of positions of the structure A is used without providing a dedicated one,
The tilt angle may be detected based on the difference between the detected displacement amounts at a plurality of locations.

In the above embodiment, in the displacement amount control means (M1) and the inclination control means (M2), large displacements and inclinations larger than the setting are first corrected by water injection or drainage to the water storage tank chambers 2 ... Jack 17 ...
However, the present invention may be modified by only pouring or draining the water storage tank chambers 2 without using the hydraulic jacks 17 ...

INDUSTRIAL APPLICABILITY The present invention is not limited to the building structure A that utilizes groundwater buoyancy for supporting the ground having a high groundwater level as described above, but can also be applied to a case where the structure A to be built on soft ground is supported.

(Effect) As described above, according to the present invention, the displacement amount control means automatically positions the structure at a predetermined position in the vertical direction, and the inclination control means corrects the inclination of the structure. And maintain a horizontal posture, and by the load control means,
Since the load applied to the underground pile is maintained at an appropriate level, it is possible to maintain the building structure in a well-prescribed and stable posture without any special operation, regardless of occurrence of uneven settlement. I can do it now.

Moreover, not only the drive lifting mechanism, but also the load applied to the underground pile by water injection or drainage to the water storage tank chamber, it is possible to avoid the structure being heavily loaded on the underground pile and damaging the structure, Since there is no need to distribute the load, the number of underground piles can be reduced, and it has become possible to construct a structure on a ground with high groundwater level or soft ground with a short construction period and low construction cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a building structure utilizing groundwater buoyancy according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part, FIG. 3 is a plan view of the main part, and FIG. Is a block diagram showing a schematic configuration for performing a control operation, FIG. 5 is a flow chart for explaining the overall control operation, FIG. 6 is a flow chart for explaining the control operation of the displacement amount control means, and FIG. FIG. 8 is a flow chart for explaining the control operation of the tilt control means, and FIG. 8 is a flow chart for explaining the control operation of the load control means. 2 ... Water tank room, 3 ... Water injection device, 4 ... Drainage device, 15 ... Underground pile, 17 ... Hydraulic jack as drive lifting mechanism, 27 ... Displacement sensor, 28 ... Inclination sensor, 29 ... …
Load sensor, A ... Structure.

Claims (1)

[Claims] 1. A water injection device connected to each of the water storage tank chambers that are horizontally divided in the structure so as to be able to individually inject water, and a water injection device that is individually connected to each of the water storage tank chambers so as to allow drainage. A drainage device, a drive lifting mechanism that is interposed between the underground pile and the structure to change and adjust the relative height of the structure, and a displacement sensor that detects the amount of vertical displacement of the structure with respect to the ground surface. An inclination sensor for detecting an inclination angle of the structure with respect to a horizontal plane, a load sensor for detecting a load applied to the underground pile, and a displacement amount detected by the displacement sensor so that the detected displacement amount falls within a set range. A displacement amount control means for controlling the operation of each of the water injection device and the drainage device, and based on the inclination angle detected by the inclination sensor, the detected inclination angle falls within a set angle range, Inclination control means for controlling the operation of each of the water injection device and the drainage device, and based on the load detected by the load sensor, operates the drive elevating mechanism, the water injection device, and the drainage device so that the detected load is within a set range. A support control device for a building structure, comprising: load control means for controlling.