JP5991480B2 - Jack operation amount calculation system and method and jack control system and method in underpinning - Google Patents

Description

  The present invention relates to a jack operation amount calculation system and method, and a jack control system and method applied when an underground structure is constructed by an underpinning method.

  When constructing underground structures in the underground space, change the load of the existing structures so that the existing structures such as buildings and viaducts built on the ground will not be affected. Underpinning methods are used, but underground structures such as road tunnels and railway tunnels are often built in urban areas. In such cases, these underground structures are also installed. Since it is necessary to replace the load as a structure, the underpinning method requires higher reliability and safety.

  In order to construct an underground structure using the underpinning method, for example, a temporary support girder is placed at the excavation site while excavating the lower part of the existing structure, and the load of the existing structure is received by the temporary support girder. In this state, a new underground structure is constructed, but during that time, careful attention must be paid to the vertical displacement of the existing structure.

  To manage the vertical displacement of an existing structure, a jack is placed between the existing structure and the temporary support girder in the above example, and the measured value exceeds the allowable value while measuring the vertical displacement of the existing structure. If there is a concern that the vertical displacement exceeds the allowable value, the jack placed at that location is expanded or contracted.

  Here, in comparatively small scale underpinning, manual control by which an operator operates individual jacks is sufficient. However, when an existing structure is a box of a railway or a road and the number of jacks reaches several hundreds. For this, automatic control by a computer is required instead of manual control.

Japanese Patent Laid-Open No. 2004-150151 JP 2004-107971 A

  However, if the existing structure to be replaced is an underground structure, it is subject to deformation restraint in various directions from the surrounding ground, and when the existing structure is a box such as a railway tunnel, Therefore, the behavior of the existing structure when the jack operation is performed becomes extremely complicated.

  Therefore, whether it is manual control by an operator's operation or automatic control by a computer, the operation of extending or retracting the jack of the support point in a direction in which the vertical displacement measured at a certain support point is reduced becomes an existing structure as intended. In some cases, it is difficult to adjust the vertical displacement of the object.For example, although the support point where the jack operation was performed was within the allowable range, the vertical displacement was reversed at the support point where the jack operation was not performed. There has been a problem in that the vertical displacement can hardly be adjusted even if the allowable range is exceeded or the jack operation is performed.

  The present invention has been made in consideration of the above-described circumstances, and in constructing an underground structure by an underpinning method, a jack operation amount calculation capable of adjusting a vertical displacement of an existing structure as intended is performed. It is an object to provide a system and method and a jack control system and method.

In order to achieve the above object, a jack operation amount calculation system in underpinning according to the present invention as described in claim 1, supports points R _i (i = 1,2) of an existing structure to be subjected to load exchange. N), a vertical displacement measuring means for measuring the vertical displacement of the existing structure at the support point, and an arithmetic processing means, the arithmetic processing means comprising the support Among the points, the vertical displacement generated at each support point when a unit amount of jack stroke is given to the support point is calculated for each support point, and the influence coefficient f _ij (i = 1, 2,... N, j = 1, 2,... N) and the inverse matrix of the matrix [F] with the influence coefficient as an element is calculated as [F] ⁻¹ , and the existing structure is subject to vertical displacement adjustment. vertical displacement at the support points in the state where a _{{v} (v i (i} = 1,2, · · N)) of 該鉛 straight displacement {v} as well as measured by the vertical displacement measurement means, by using the set adjustment displacements {[delta]} as an amount to be offset by the jack, the following equation,
{S} = [F] ⁻¹ {δ}
The required stroke amount {s} (s _i (i = 1, 2,... N)) is calculated by calculating.

In the jack operation amount calculation system in underpinning according to the present invention, the arithmetic processing unit is configured to cause the vertical displacement {v} measured at each support point and the target vertical displacement {v _t } (v _ti (i = 1, 2,... N)), the adjustment displacement {δ} is set by performing a comparison operation such as a difference, a magnitude, a ratio, and the like.

  According to a jack control system for underpinning according to the present invention, as described in claim 3, the stroke amount of the jack according to claim 1 or 2 is calculated as a necessary stroke amount {s calculated by the arithmetic processing means {s }, Control means for driving and controlling the jacks is provided.

In addition, the jack operation amount calculation method in underpinning according to the present invention includes a support point R _i (i = 1, 2,... N of an existing structure to be subjected to load exchange, as described in claim 4. ), The vertical displacement of the existing structure generated at each support point at that time is measured and the measured value is divided by the stroke amount. To calculate the influence coefficient f _ij (i = 1,2, ... N),
By repeatedly performing the influence coefficient calculation process while sequentially changing j from 1 to N, f _ij (i = 1, 2,... N, j = 1, 2,. The matrix [F] is calculated as follows:
Calculate the inverse matrix [F] ⁻¹ of the matrix [F],
Measure the vertical displacement {v} (v _i (i = 1, 2,... N)) at the support point in a state where the existing structure is an adjustment target of vertical displacement,
Of the vertical displacement {v}, an adjustment displacement {δ} is set as an amount to be offset by the jack, and the adjustment displacement is used to
{S} = [F] ⁻¹ {δ}
The required stroke amount {s} (s _i (i = 1, 2,... N)) is calculated by calculating.

The jack operation amount calculation method in underpinning according to the present invention includes a vertical displacement {v} measured at each support point and a target vertical displacement {v _t } (v _ti (i = 1, 2,... N)), the adjustment displacement {δ} is set by performing a comparison operation such as a difference, magnitude, ratio, and the like.

  According to the jack control method for underpinning according to the present invention, after calculating the required stroke amount {s} according to claim 5 or 6, the jack is controlled so that the stroke amount of the jack becomes the required stroke amount. Each drive is controlled.

The jack operation amount calculation system in underpinning according to the present invention measures the vertical displacement generated at each support point of an existing structure when the stroke amount of each jack is changed, thereby supporting points with changed stroke amounts. While calculating the degree of influence on the vertical displacement from the support point itself to other support points as an influence coefficient and calculating the matrix [F] and the inverse matrix [F] ⁻¹ using them as elements, the existing structure Of the vertical displacements of the existing structure measured in a state where the object is subject to adjustment of the vertical displacement, the adjustment displacement {δ} is set as an amount to be offset by the jack, and the necessary stroke for realizing the adjustment displacement is intended to be implemented in the procedure of calculating the quantity {s} from the inverse matrix [F] ^-1, lead existing structures using such a system Jack to calculate the amount of operation of the jack for adjusting the displacement, first, the support point of the existing structures to be受替example target load _{R i (i = 1,2, ···} N) is installed in Among them, the vertical displacement of the existing structure generated at each support point is measured by the vertical displacement measuring means by changing the stroke amount of the first jack.

  As long as the vertical displacement measuring means can grasp the vertical displacement of the existing structure at each support point, it can be configured in any way, and the vertical displacement of each support point can be measured individually and directly. Measure the vertical displacement and the tilt angle around two horizontal axes at the representative points of the existing structure, or measure the vertical displacement at two different points of the existing structure and coordinate the measured values. An indirect measurement configuration in which the vertical displacement at each support point is obtained by conversion can also be employed.

  For example, the vertical displacement measuring means may be configured by installing a displacement meter on the bottom plate of the box constituting the existing structure.

  As with the conventional underpinning method, the jack is installed below the existing structure, for example, between the existing structure and a temporary receiving girder or replacement plate that receives the existing structure.

  The operation of changing the stroke amount to the jack grasps how the change of the stroke amount at one support point affects the vertical displacement of the existing structure at the support point and other support points. For example, when the existing structure is a road tunnel or a railway tunnel, for example, by using a night time zone, the service is temporarily interrupted as necessary.

Next, the vertical displacement of the existing structure measured at each support point is divided by the stroke amount of the first jack, and this is calculated as an influence coefficient f _i1 (i = 1, 2,... N).

It is engineeringly appropriate to assume that the behavior of the existing structure by the jack operation falls within the elastic range, and therefore the above-mentioned influence coefficient f _i1 is relative to an arbitrary amount of jack stroke applied to the first jack. This corresponds to the proportional coefficient of the vertical displacement at the support point R _i (i = 1, 2,... N) and is multiplied by the stroke amount to support point R _i (i = 1, 2,... • The vertical displacement that occurs in N) can be defined as a predictable index.

Next, by changing the stroke amount of the second jack, the influence coefficient f _i2 (i = 1, 2,... N) is calculated in the same procedure as described above, and _thereafter , f _iN ( i = 1, 2,... N).

  From the principle of superposition, the behavior of an existing structure at a certain support point can be considered as the sum of the effects of jack operations at each support point, including the support point itself.

Therefore, the matrix [F] whose elements are the influence coefficients f _ij (i = 1, 2,... N, j = 1, 2,... N) obtained by the above procedure is given at the support points. When the stroke amount to be performed is {s ′} and the vertical displacement at the support point is {δ ′},
{Δ ′} = [F] {s ′}
Will be satisfied.

Next, an inverse matrix [F] ⁻¹ of the matrix [F] is calculated. Here, the inverse matrix [F] ⁻¹ is given by
{S ′} = [F] ⁻¹ {δ ′}
Therefore, the stroke amount {s ′} that can bring the vertical displacement {δ ′} to the support point can be calculated backward.

The inverse matrix [F] ⁻¹ calculated in this way is appropriately stored in a storage means such as a hard disk so that it can be read out at any time.

Next, in a state where the existing structure is a target for adjusting the vertical displacement, the vertical displacement {v} (v _i (i) at the support point R _i (i = 1, 2,... N) in the existing structure. = 1, 2,... N)) are measured using vertical displacement measuring means.

  Next, of the measured vertical displacement {v}, an adjustment displacement {δ} is set as an amount to be canceled by the jack.

  In adjusting the vertical displacement generated in the existing structure, an allowable value for the vertical displacement is often determined. Therefore, the adjustment displacement {δ} is an allowable value from the measured vertical displacement {v}. However, if the allowable value is very small due to safety or other reasons when the vehicle is traveling in an existing structure, for example, the total amount of the measured vertical displacement {v} Is always the amount that should be offset by jacking.

  In this case, the measured vertical displacement {v} is directly used as the adjustment displacement {δ}.

Next, [F] ⁻¹ is appropriately read from the storage unit as necessary, and the set displacement (δ) is used to set the following equation:
{S} = [F] ⁻¹ {δ}
Is calculated to calculate the required stroke amount {s} (s _i (i = 1, 2,... N)).

  In this way, the required stroke amount {s} to be given to each jack is calculated in consideration of the influence from other support points as well as its own support points, and for existing structures. Since it is calculated by actually giving the jack stroke, if the jack is operated according to the required stroke amount {s}, a simple automatic focusing on the operator's experience or manual operation by trial and error or only the target support point Unlike the operation, the vertical displacement generated in the existing structure can be adjusted reliably and quickly.

As described above, the adjusted displacement {δ} may be an amount that the total amount of the measured vertical displacement {v} should always be canceled by the jack, but the target vertical displacement {v _t as an allowable value for the vertical displacement. } Is defined, the vertical displacement {v} measured at each support point and the target vertical displacement {v _t } (v _ti (i = 1, 2,... N) at the support point. ) Can be adopted to set by performing a comparison operation with the.

Here, the target vertical displacement {v _t } is appropriately set as an allowable value from the viewpoint of the safety of the existing structure, particularly when the existing structure is a road tunnel or a railway tunnel, particularly from the viewpoint of safety during vehicle travel. The known amount given.

The comparison operation between the vertical displacement {v} and the target vertical displacement {v _t } can be, for example, an operation such as a difference, a magnitude, and a ratio thereof, but the setting is arbitrary, and the vertical displacement v _i settings and such is its vertical displacement v _i the total amount of the adjustment displacement [delta] _i of when exceeded 70% for example of the target vertical displacement v _ti, when the vertical displacement v _i exceeds the target vertical displacement v _ti A setting in which the excess is set as the adjustment displacement δ _i can be considered.

How to determine the support point that is the target of calculation of the required stroke amount {s} is also arbitrary, and among the support points R _i (i = 1, 2,... N), the vertical displacement {v} is the target. While it is assumed that the vertical displacement {v _t } or only a support point that exceeds the predetermined ratio is targeted for adjustment, the vertical displacement {v} exceeds the target vertical displacement {v _t } or the predetermined ratio even at one location. If there is a spot, it is also possible to adopt a method in which not only the support point of the spot but also the periphery or all other support points are set as adjustment targets of the vertical displacement.

  It is also optional to consider only subsidence as vertical displacement or to include uplift.

More specifically, if only the subsidence is considered as the vertical displacement, and the vertical displacement v _i exceeds the target vertical displacement v _ti , the excess is set as the adjustment displacement δ _i .
δ _i = − (v _i −v _ti ); v _i > v _ti
δ _i = 0; v _i ≦ v _ti
It becomes. In this case, for example, when the target vertical displacement v _ti is 3 mm and the measured vertical displacement v _i is 10 mm, the difference −7 mm is the vertical displacement adjustment displacement δ _i by the jack, and the measured vertical displacement is 2 mm. In this case, the adjustment displacement δ _i of the vertical displacement is 0, and the support point is not an adjustment target.

On the other hand, considering not only subsidence but also uplift, the subsidence side is positive,
δ _i = − (v _i −v _tdi ); v _i > v _tdi
δ _i = 0; v _tui <v _i <v _tdi
δ _i = − (v _i −v _tui ); v _i <v _tui
v _tdi ; sinking target vertical displacement at the i-th support point
v _tui ; the target vertical displacement on the raised side at the i-th support point.

As described above, when the vertical displacement {v} exceeds the target vertical displacement {v _t } or its predetermined ratio even at one location, the vertical displacement at all support points including that location is adjusted. It doesn't matter.

As described above, in the jack operation amount calculation system according to the present invention, how the change in the stroke amount at a certain support point affects the vertical displacement of the existing structure at the support point and other support points. The process of grasping the inverse matrix in the form of [F] ^-1 (preliminary process) and applying the inverse matrix to each jack using [F] ^-1 so that the vertical displacement of the existing structure falls within the allowable range Two steps of calculating the required stroke amount {s} to be performed (operation amount calculation step) are sequentially performed, but the vertical displacement measurement for performing the operation amount calculation step is the vertical generated in the existing structure. If it can be determined that the displacement should be adjusted, it may be performed at an arbitrary timing.

Regarding the relationship between the preliminary process and the operation amount calculation process, if the inverse matrix [F] ⁻¹ can be repeatedly used because the change in the ground structure in the underpinning work is small, the operation amount calculation process is performed after the preliminary process. May be performed repeatedly, or when the ground structure change in the underpinning work is relatively large, the inverse matrix [F] ⁻ used for the operation amount calculation is performed by repeatedly performing the preliminary step and the operation amount calculation step. ¹ may be recalculated each time.

  The jack operation amount calculation system according to the present invention is characterized by calculating a necessary stroke amount {s} that can adjust a vertical displacement generated in an existing structure by being applied to each jack. Whether or not to actually operate the jack according to the calculated required stroke amount {s} is an arbitrary matter, and even if the jack is operated, it is still arbitrary whether it is performed manually or by automatic control.

  Here, the jack provided with the control means which respectively drives and controls the jack so that the stroke amount of the jack according to claim 1 or 2 becomes the necessary stroke amount {s} calculated by the arithmetic processing means. According to the control system, or after calculating the required stroke amount {s} according to claim 4 or 5, the jack control method for driving and controlling the jack so that the stroke amount of the jack becomes the required stroke amount. According to the above, even if there are many support points, it takes time to judge jack operation, and even when there are many jacks and manual operation takes time, the vertical displacement adjustment can be performed quickly. Can be done.

It is the figure of the jack control system 1 in the underpinning which concerns on this embodiment, (a) is a layout, (b) is a block diagram. The flowchart which showed the implementation procedure (preliminary process) of the jack control method in the underpinning which concerns on this embodiment. The flowchart which showed the implementation procedure (the operation amount calculation process and the displacement adjustment process) of the jack control method in the underpinning which concerns on this embodiment. Explanatory drawing which showed the effect | action of the jack control system 1. FIG. It is a block diagram concerning a modification, (a) is a jack control system, (b) is a jack operation amount calculation system.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Embodiments of a jack operation amount calculation system and method and a jack control system and method in underpinning according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a diagram showing a jack control system in underpinning according to the present embodiment. As shown in the figure, the jack control system 1 according to the present embodiment uses a box 2 of a railway tunnel as an existing structure to be replaced, and the load of the box is a temporary receiving pile constructed on the ground 3. 4 and 4 and an underpinning method for constructing a new underground structure 6 below the temporary support beam 5 while receiving it with a replacement structure composed of the temporary support beam 5 bridged over the temporary support beam 5 A plurality of hydraulic jacks 7 disposed between the temporary support girder 5 and the vertical displacement of the box 2 are measured so that the box can be supported using the lower surface of the box 2 as a supporting point. Displacement meters 8 and 8 as vertical displacement measuring means, an arithmetic processing section 13 as arithmetic processing means, and a control section 9 as control means, and by driving and controlling the hydraulic jack 7 by the control section, Adjust the vertical displacement of the box 2 at each support point described above, There are is adapted to be able to hold the 該函 member in a desired position and orientation.

  The arithmetic processing unit 13 can be composed of hardware such as a CPU, a mother board, and a memory constituting the personal computer 12 and software operating on the hardware, and the personal computer 12 stores storage means for storing various data. As a hard disk 10 and a display 11.

  Displacement meters 8 and 8 are respectively installed on the bottom plate constituting the box 2 and in the vicinity of the leg portions of the side walls rising from the bottom plate, and by converting the measured values of the vertical displacement at the two points by coordinate conversion, The vertical displacement of the box 2 at the support point of the hydraulic jack 7 extending on the lower surface of the box 2 can be calculated.

In the preliminary process, the arithmetic processing unit 13 uses the vertical displacement generated at each support point of the box 2 when the stroke amount of each hydraulic jack 7 is changed, and supports the support from the support point where the stroke amount is changed. While calculating the degree of influence regarding the vertical displacement to the point itself or another supporting point as an influence coefficient and calculating the matrix [F] and the inverse matrix [F] ⁻¹ using them as elements, Sets the adjustment displacement as the amount to be canceled out by the hydraulic jack 7 among the measured vertical displacements of the box 2, and calculates the necessary stroke amount for realizing the adjustment displacement from the inverse matrix. ing.

  The control unit 9 can adjust the vertical displacement of the box 2 by driving and controlling each hydraulic jack 7 based on the required stroke amount calculated by the calculation processing unit 13.

FIGS. 2 and 3 are flowcharts showing the procedure for carrying out the jack control method according to the present embodiment, and FIG. 4 is a diagram in which support points supported by the hydraulic jack 7 are distributed in a 3 × 3 plane grid pattern. It is the perspective view which showed the distribution condition of this supporting point at the time of expressing them as supporting point _Ri (i = 1,2, ... 9).

  As can be seen from these drawings, in order to adjust the vertical displacement of the box 2 using the jack control system 1 according to this embodiment, first, a series of preliminary steps shown in steps 101 to 106 are performed. Thereafter, the operation amount calculation step shown in steps 107 to 109 and the displacement adjustment step shown in step 110 are sequentially performed.

First, in the preliminary process, the supporting point R _j (j = 1, 2,...) Of the box 2 is used in a time zone in which the box 2 is temporarily suspended as a railway tunnel, for example, at midnight. ... Change the stroke amount of the first hydraulic jack 7 among the hydraulic jacks 7 installed in 9), that is, give the hydraulic jack an increment of s ′ ₁ and each support point R _{i at} that time The vertical displacement δ ′ _i1 (i = 1, 2,... 9) of the box 2 occurring at (i = 1, 2,... 9) is measured by the displacement meters 8 and 8 (step 101). FIG. 4 shows a state in which the vertical displacement δ ′ ₈₁ is generated at the support point R ₈ .

Next, the vertical displacement δ ′ _i1 (i = 1, 2,... 9) of the box 2 measured at each support point R _i (i = 1, 2,... 9) is used as the first hydraulic pressure. Dividing by the stroke amount s ′ ₁ of the jack 7, this is calculated by the arithmetic processing section 13 as an influence coefficient f _i1 (i = 1, 2,... 9) (step 102).

Next, by changing the stroke amount of the second hydraulic jack 7, the influence coefficient f _i2 (i = 1, 2,... 9) is calculated in the same procedure as described above (step 101 to step 102). Similarly, the influence coefficients are calculated until f _i9 (i = 1, 2,... 9) (step 103).

Next, a matrix [F] whose elements are influence coefficients f _ij (i = 1, 2,..., J = 1, 2,... 9) obtained by the above-described procedure is shown in the following equation. As shown in FIG. That is,

Next, the inverse matrix [F] ⁻¹ of the matrix [F] is calculated by the arithmetic processing unit 13 (step 105).

Next, the calculated inverse matrix [F] ⁻¹ is stored in the hard disk 10 to prepare for a read operation in an operation amount calculation step described later (step 106).

Next, in the operation amount calculation step, the vertical displacement {v} (v _i (i = 1, 2,...) At the support point R _i (i = 1, 2,... 9) in an arbitrary time zone. 9)) is measured using the displacement meters 8 and 8 (step 107).

  Next, of the measured vertical displacement {v}, the adjustment displacement {δ} is set as an amount to be canceled by the hydraulic jack 7 (step 108).

For example, when the vertical displacement v _i exceeds 70% of the target vertical displacement v _{ti at} a certain support point, the adjustment displacement {δ} is adjusted by adjusting the total amount of the vertical displacement v _i at that support point and all the support points. Setting as δ _i is possible.

Next, the already calculated inverse matrix [F] ⁻¹ is read from the hard disk 10 and the set displacement (δ) is set as follows:
{S} = [F] ⁻¹ {δ}
The required stroke amount {s} (s _i (i = 1, 2,... 9)) is calculated by the arithmetic processing unit 13 (step 109).

When each value of the adjustment displacement {δ} is 1 mm, 2 mm, 5 mm, 2 mm, 7.5 mm, 3 mm, 4 mm, 5 mm, 4 mm in order from the support point R ₁ , F] ^-1 shows a state in which the required stroke amount {s} (s _i (i = 1, 2,... 9)) in each hydraulic jack 7 is obtained.

  Here, the measured vertical displacement {v}, adjustment displacement {δ}, and required stroke amount {s} can be displayed on the display 11 in the form of a three-dimensional graphic similar to that shown in FIG. According to this, it becomes possible to visually grasp the vertical displacement state of the box 2 and the jack operation state based on it.

  The series of manipulated variable calculation steps described above is continuously performed in all other time zones except the time zone for performing the preliminary process because it has not been determined whether or not the calculation result is used in the displacement adjustment process at the time of implementation. It doesn't matter if you do.

  Next, the hydraulic jacks are driven and controlled by the control unit 9 so that the stroke amount of each hydraulic jack 7 becomes the required stroke amount {s} (step 110).

In the displacement adjustment step using the hydraulic jack 7, when it is determined that vertical displacement adjustment is necessary for the box 2, for example, the vertical displacement {v} measured while the box 2 is in service is the target vertical. When it is determined that the adjustment is necessary because it approaches the displacement {v _t }, the required stroke amount {s} calculated using the vertical displacement {v} is used to It is desirable to be performed after the end of service.

Further, since the inverse matrix [F] ⁻¹ is appropriately updated in the preliminary process according to the change in the ground structure in the underpinning work, the necessary stroke amount {s} is calculated as close as possible to the inverse matrix [F ] It is desirable to calculate using ^-1 .

  As described above, according to the jack control system 1 and method in underpinning according to the present embodiment, the required stroke amount {s} given to each hydraulic jack 7 is not limited to its own support point but to other support. Since the calculation is performed in consideration of the influence from the points and by actually giving the jack stroke to the box 2, attention is paid only to the manual operation by the operator's experience and trial and error or the target support point. Unlike the simple operation, the vertical displacement generated in the box 2 can be adjusted reliably and quickly.

  Further, according to the jack control system 1 and method in underpinning according to the present embodiment, the hydraulic jacks are driven and controlled by the control unit 9 so that the stroke amount of each hydraulic jack 7 becomes the required stroke amount {s}. Thus, even if the number of hydraulic jacks 7 is large and manual operation takes time, the vertical displacement adjustment of the box 2 can be performed quickly.

  In the present embodiment, the hydraulic jacks are each driven and controlled by the control unit 9 so that the stroke amount of each hydraulic jack 7 becomes the required stroke amount {s}. Instead, FIG. ), The jack control system 1 may be a jack control system in which the control unit 9 is omitted, and the hydraulic jack 7 may be manually operated.

  In such a configuration, although the operational effect by automatic control cannot be enjoyed, it is necessary to be calculated in the same manner as in the above-described embodiment, unlike the manual operation by the operator's experience and trial and error, or the simple operation focusing only on the target support point By operating the hydraulic jack 7 using the stroke amount {s}, it is possible to reliably and quickly adjust the vertical displacement generated in the box 2.

Further, in the present embodiment, the hydraulic jacks are driven and controlled by the control unit 9 so that the stroke amount of each hydraulic jack 7 becomes the required stroke amount {s}. As shown in (b), the hydraulic jack 7, a displacement meter 8 for measuring the vertical displacement of the box 2, and an arithmetic processing unit 13 are provided, and the arithmetic processing unit is connected to each hydraulic jack in the preliminary process. Using the vertical displacement generated at each support point of the box 2 when the stroke amount of 7 is changed, the influence of the vertical displacement from the support point where the stroke amount is changed to the support point itself or another support point while calculating the matrix [F] and the inverse matrix [F] ^-1 thereof that those elements to calculate the degree as influence coefficients, in the operation amount calculation step, the measured vertical displacements of a box body 2 In other words, a jack operation amount calculation system 51 configured to set an adjustment displacement as an amount to be canceled by the hydraulic jack 7 and calculate a necessary stroke amount for realizing the adjustment displacement from an inverse matrix may be used. Absent.

  In the jack operation amount calculation system 51, the configuration for operating the hydraulic jack 7 by automatic control is omitted from the jack control system 1, but the configuration for calculating the required stroke amount {s} is the jack control system. As in the case of the above-described embodiment, the necessary stroke amount {s} to be applied to each hydraulic jack 7 is calculated in consideration of the influence from the other support points as well as the own support points. There is no change in that there is an effect of being able to do.

1 Jack control system 2 Box (existing structure)
7 Hydraulic jack (jack)
8 Displacement meter (Vertical displacement measuring means)
9 Control unit (control means)
13 Arithmetic processing part (arithmetic processing means)

Claims (6)

The jacks installed at the support points R _i (i = 1, 2,... N) of the existing structures to be subjected to load exchange and the vertical displacements of the existing structures are measured at the support points, respectively. A vertical displacement measuring means; and an arithmetic processing means, wherein the arithmetic processing means calculates a vertical displacement generated at each of the support points when a unit amount of jack stroke is given to the support point. The influence coefficient f _ij (i = 1, 2,... N, j = 1, 2,... N) is calculated for each support point and the inverse of the matrix [F] having the influence coefficient as an element. The matrix is calculated as [F] ⁻¹ , and the vertical displacement {v} (v _i (i = 1, 2,... N) at the support point in a state where the existing structure is a target for adjusting the vertical displacement. ) Is measured by the vertical displacement measuring means and is set as an amount of the vertical displacement {v} to be canceled by the jack. Using the adjustment displacement {[delta]}, the following equation,
{S} = [F] ⁻¹ {δ}
By calculating a required stroke amount {s} (s _i (i = 1, 2,... N)). The arithmetic processing means calculates the vertical displacement {v} measured at each support point and the target vertical displacement {v _t } (v _ti (i = 1, 2,... N)) at the support point. The jack operation amount calculation system in underpinning according to claim 1, wherein the adjustment displacement {δ} is set by performing a comparison operation such as a difference, a magnitude, a ratio, and the like. A control means for driving and controlling the jacks is provided so that the stroke amount of the jack according to claim 1 or 2 is equal to the required stroke amount {s} calculated by the arithmetic processing means. Jack control system for underpinning. Among the jacks installed at the support points R _i (i = 1, 2,... N) of the existing structure to be subjected to the load exchange, the stroke amount of the j-th jack is changed and the above-mentioned An influence coefficient f _ij (i = 1, 2,... N) is calculated by measuring the vertical displacement of the existing structure generated at each support point and dividing the measured value by the stroke amount.
By repeatedly performing the influence coefficient calculation process while sequentially changing j from 1 to N, f _ij (i = 1, 2,... N, j = 1, 2,. The matrix [F] is calculated as follows:
Calculate the inverse matrix [F] ⁻¹ of the matrix [F],
Measure the vertical displacement {v} (v _i (i = 1, 2,... N)) at the support point in a state where the existing structure is an adjustment target of vertical displacement,
Of the vertical displacement {v}, an adjustment displacement {δ} is set as an amount to be offset by the jack, and the adjustment displacement is used to
{S} = [F] ⁻¹ {δ}
To calculate the required stroke amount {s} (s _i (i = 1, 2,... N)). The difference between the vertical displacement {v} measured at each support point and the target vertical displacement {v _t } (v _ti (i = 1, 2,... N)) at the support point, The jack operation amount calculation method in underpinning according to claim 4, wherein the adjustment displacement {δ} is set by performing a comparison operation such as a ratio. 6. Jack control in underpinning, wherein after the required stroke amount {s} according to claim 4 or 5 is calculated, the jack is driven and controlled so that the stroke amount of the jack becomes the required stroke amount. Method.

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