JP2010180022A - Method of setting sole plate, and load monitor - Google Patents

Abstract

In a method of setting a sole plate for equipment installation, variation in load among a plurality of jack bolts supporting the sole plate is within a predetermined range without depending on the skill level of an operator.
A load applied to a plurality of jack bolts 6 that support a lower surface of a sole plate 5 is obtained from a strain amount of a support piece 2 inserted between the sole plate 5 and the jack bolts 6. Based on the load applied to each jack bolt 6, the required adjustment height of each jack bolt 6 for keeping the variation in the load between the jack bolts 6 within a predetermined range is obtained. Next, the worker adjusts the height of the jack bolt 6 based on the obtained necessary adjustment height.
[Selection] Figure 1

Description

  The present invention relates to a method for setting a sole plate for equipment installation and a load monitoring device for monitoring a load acting on a jack bolt installed on a lower surface of the sole plate.

  In the installation work of a rotating device, it is very important to adjust the level of a rotating part such as a rotating shaft or a bearing box of the rotating device to be within a predetermined range required by the device. This is because if the level is not within a predetermined range, vibration occurs during operation of the device, and in the worst case, the device may be damaged by vibration. The adjustment of the level is performed by adjusting the level and the set height of the sole plate on which the rotating device is placed.

  The flatness of the sole plate is generally adjusted using a flat plate liner and a graded chalk liner installed on the top surface of the flat plate liner. The plate liner and the choke liner require high processing accuracy. Therefore, the cost and time spent for processing have been problems. In addition, when the flat liner is not installed horizontally, the top surface of the chalk liner cannot be adjusted horizontally, and a contact between the sole plate and the chalk liner occurs, which causes a local load on the sole plate. Will cause vibration of rotating equipment. For this reason, the setting work of the flat plate liner requires caution, and usually, a skilled worker spends a great deal of time using a level or the like. Therefore, as means for solving this problem, for example, Patent Document 1 discloses a method of adjusting the level and height of the sole plate using a hydraulic jack having a spherical seat.

  However, the hydraulic jack disclosed in Patent Document 1 is larger in size than a flat plate liner or a chalk liner. Therefore, when a large number of foundation bolts are arranged densely, the foundation bolt and the hydraulic jack, or There is a problem that hydraulic jacks interfere with each other. Therefore, it cannot be used for a large-sized rotating device such as an axial compressor for supplying air to a blast furnace at a steel mill or a steam turbine at a power plant where a large number of foundation bolts are arranged densely. Moreover, since the hydraulic jack of patent document 1 is embedded in a foundation as it is at the time of apparatus installation, it is not economical.

  For this reason, jack bolts are generally used in place of the choke liner and the hydraulic jack in the setting operation of the sole plate in the large-sized rotating device. FIG. 6 shows a conventional rotating device installation method using jack bolts. First, the flat liner 103 is installed on the upper surface of the foundation concrete 101 through the non-shrink mortar 102. Next, the jack bolt 105 is installed on the upper surface of the flat plate liner 103 via the support nut 104. Then, after each jack bolt 105 is rotated to align the height of the upper end with a predetermined height, the sole plate 106 is placed on the upper surface of the jack bolt 105. Thereafter, it is confirmed that the lower surface of the sole plate 106 and the upper surfaces of all the jack bolts 5 are in contact with each other, and the levelness and height of the upper surface of the sole plate 106 are measured. At this time, if the measurement result is within the predetermined range, the setting of the sole plate 106 is completed. If the measurement result is not within the predetermined range, the height of the jack bolt 105 is adjusted again, and the measurement result is within the predetermined range. Repeat until the adjustment. The flatness of the flat plate liner 103 is adjusted using, for example, a level as described above in order to prevent the jack bolt 105 and the sole plate 106 from coming into contact with each other.

  In general, since a plurality of sole plates 106 are used for installing the rotating device, if there is a variation in height between the sole plates 106, the variation is adjusted so that the variation is within a predetermined range. Do. When the setting of all the sole plates 106 is completed, the rotating device 110 is placed on the sole plate 106, and the level of the rotating device 110 such as a bearing box is measured. If the level does not fall within the predetermined range, the height of each jack bolt 105 is adjusted until it falls within the predetermined range, and the sole plate 106 is reset. When the levelness falls within a predetermined range, the casing 112 of the rotating device 110 is fixed by the foundation bolts 111 embedded in the foundation concrete 101 in advance. Then, a grout material is poured between the sole plate 106 and the foundation concrete 101, and the installation work of the equipment is completed.

JP2002-20084

  However, in the conventional method, although the level and height of the sole plate 106 are adjusted, whether or not the lower surface of the sole plate 106 and the upper surfaces of all the jack bolts 105 are in contact with each other without any gaps can be determined by visual observation or the like. It was only confirmed with a gap gauge. Therefore, it has not been confirmed whether or not the variation in the load on the equipment applied to each jack bolt 105 is within a predetermined range. For this reason, there is a concern that the load concentrates on some jack bolts, and this causes vibration of the equipment over time. In addition, when no load is applied to some jack bolts 105, that is, there is a slight gap between the upper end of the jack bolt 105 and the lower surface of the sole plate 106 so that the gap cage does not enter. In some cases, the gap remained after the grout material was poured. If the gap remains, not only the load on the jack bolt 105 is deviated, but also the jack bolt 105 or the sole plate 106 may be rusted in the gap portion of the grout. This rust lifts the sole plate 106 over time and deteriorates the levelness of the sole plate 106, which has been a cause of vibrations of the equipment.

  Moreover, since there are many jack bolts 105, the level of the sole plate 106 may deteriorate as a result of adjusting the height of the jack bolt 105 at one location. In that case, since it is necessary to repeatedly check the level with the level and measure the height with the level measuring instrument each time, the work time becomes very long. Furthermore, the work itself largely depends on the skill and intuition of the worker, and the human burden has been great.

  The present invention has been made in view of the above points, and does not depend on the skill level of the operator, and the variation in load between the jack bolts supporting the sole plate within a predetermined range can be achieved in a shorter time than before. The sole plate is set with high accuracy.

  In order to achieve the above object, the present invention is a method for setting a sole plate for equipment installation, in which a load applied to a plurality of jack bolts supporting a lower surface of the sole plate is applied to the sole plate and the plurality of jack bolts. Measured as the load applied to the support piece inserted between the two, and based on the measurement result, obtain the necessary adjustment height of each jack bolt to keep the variation in the load among the plurality of jack bolts within a predetermined range. The height of the jack bolt is adjusted based on the necessary adjustment height.

  According to the present invention, since the height of each jack bolt is adjusted based on the measurement result of the load applied to the jack bolt, the variation in load between the jack bolts can be determined within a predetermined range without depending on the skill level of the operator. Can fit inside. For this reason, it is possible to prevent the load from being concentrated on some jack bolts and the grout material from being poured in a state in which a gap is left between the jack bolt and the sole plate. In addition, since it is not necessary to use, for example, visual inspection or a gap gauge to determine whether the jack bolt and the sole plate are properly in contact with each other, it is possible to shorten the work time for setting the sole plate.

  The upper surface of the jack bolt may be convexly curved, and the support piece may be concavely recessed corresponding to the shape of the lower surface of the jack bolt that is convexly curved, and the upper surface may be flat.

The support piece is elastically deformed in proportion to a load applied to the support piece, and a strain gauge for measuring a strain amount of the support piece is bonded to a side surface of the support piece, and a load between the plurality of jack bolts. The required adjustment height X of each jack bolt for keeping the variation within a predetermined range may be obtained by the following equation.
X = (WL / nEA) −ΔL
Where L is the height of the support piece, ΔL is the strain amount of the support piece, E is the longitudinal elastic modulus of the support piece, A is the cross-sectional area of the support piece, and n is the number of jack bolts that support the sole plate , W is the sum of the weight of the sole plate or the weight of the device placed on the upper surface of the sole plate and the sole plate.

  Another aspect of the present invention is a load monitoring device that monitors loads acting on a plurality of jack bolts that support the lower surface of a sole plate for equipment installation, and is inserted between the sole plate and the plurality of jack bolts, respectively. A plurality of support pieces which are elastically strained in proportion to the load, a strain gauge which is bonded to the side surface of the support piece and measures the strain amount of the support piece, and the plurality of jack bolts based on the strain amount of each support piece And an arithmetic unit that obtains a necessary adjustment height of each jack bolt for keeping the variation in load within a predetermined range.

The arithmetic device may obtain a necessary adjustment height X of each jack bolt for keeping the variation in load among the plurality of jack bolts within a predetermined range by the following equation.
X = (WL / nEA) −ΔL
Where L is the height of the support piece, ΔL is the strain amount of the support piece, E is the longitudinal elastic modulus of the support piece, A is the cross-sectional area of the support piece, and n is the number of jack bolts that support the sole plate , W is the sum of the weight of the sole plate or the weight of the device placed on the upper surface of the sole plate and the sole plate.

  Further, the upper surface of the jack bolt may be convexly curved, and the support piece may be concavely recessed corresponding to the shape of the lower surface curved to the convex of the jack bolt, and the upper surface may be flat.

  According to the present invention, since the height of each jack bolt is adjusted based on the measurement result of the load applied to the jack bolt, the variation in load between the jack bolts can be determined within a predetermined range without depending on the skill level of the operator. The sole plate can be set with high accuracy.

It is the schematic which shows the structure of the load measuring device concerning this Embodiment. It is a side view which shows the state which the support piece deform | transformed with the load. It is a flowchart of the setting process concerning this Embodiment. It is a flowchart of the adjustment process concerning this Embodiment. It is explanatory drawing which shows the jack bolt concerning other embodiment, and the state of support piece vicinity. It is explanatory drawing which shows the setting method of the conventional sole plate.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is an explanatory diagram showing an outline of a configuration of a load monitoring device 1 according to the present embodiment.

  The load monitoring device 1 includes a support piece 2, a strain gauge 3 bonded to a side surface of the support piece 2, and a measuring device 4 to which a signal from the strain gauge 3 is input. The support pieces 2 are respectively inserted between a sole plate 5 on which equipment is placed and a plurality of jack bolts 6 that support the lower surface of the sole plate 5. In FIG. 1, for convenience of explanation, a state in which the sole plate 5 is supported at three points by three jack bolts is illustrated. The support piece 2 is formed by processing a steel material having a predetermined longitudinal elastic modulus into a cylindrical shape. Therefore, for example, when a load is applied to the support piece 2, the support piece 2 is deformed by ΔL with respect to the length L of the support piece 2 according to the load and the longitudinal elastic modulus as shown in FIG. 2. Then, the strain amount ΔL when the support piece 2 is deformed is measured by the strain gauge 3 and input to the measuring device 4 via the wiring 7 that connects the strain gauge 3 and the measuring device 4. In order to accurately measure the strain amount ΔL, the outer periphery of the support piece 2 is formed to be inside the upper surface of the jack bolt 6 in a plan view. Moreover, as long as the outer periphery of the support piece 2 is formed so as to be inside the upper surface of the jack bolt 6, the shape of the support piece 2 may be, for example, a prismatic shape.

  The upper and lower surfaces of the support piece 2 are machined into a flat shape so that they can contact the lower surface of the sole plate 5 and the upper surface of the flat jack bolt 6 without any gaps. The jack bolt 6 is screwed into a support nut 10, and the support nut 10 is placed on the upper surface of a flat plate liner 13 installed on a foundation concrete 11 via a non-shrink mortar 12.

  The measuring device 4 converts the strain amount ΔL of the support piece 2 measured by the strain gauge 3 when the load is applied to the support piece 2 into a load acting on each jack bolt 6 and between the jack bolts. An arithmetic unit 20 that calculates the adjustment height of each jack bolt necessary to keep the load variation within a predetermined range by calculation, a display unit 21 that displays a conversion result and a calculation result by the arithmetic unit 20, and will be described later An input unit 22 is provided.

  In the arithmetic unit 20, the following equation (2) for converting the amount of strain of the support piece 2 due to the load applied to the support piece 2 into the load acting on the jack bolt 6 and the variation in load between the jack bolts 6 are predetermined. The following equation (5) for calculating the necessary adjustment height of each jack bolt 6 to be within the range is stored in advance.

The following formula (2) will be described. When the stress p acts on a material having a longitudinal elastic modulus e, the strain d of the material is generally expressed by the following formula (1).
d = p / e (1)
Therefore, the load S applied to the support piece 2 is expressed by the following equation (2) from the strain amount ΔL of the support piece 2 measured by the strain gauge 3 and the above equation (1).
S = (ΔL / L) × E × A (2)
However, E is the longitudinal elastic modulus of the support piece 2, A is the cross-sectional area of the support piece 2, and these values and the height L of the support piece 2 are input to the computing device 20 in advance via the input unit 22. ing. In addition, the calculation result of the above formula (2) can be continuously monitored on the display unit 21 at all times. The load S applied to each jack bolt 6 is strictly equal to the load S applied to each support piece 2 plus the load due to the weight of the support piece 2 itself, but the weight of the support piece 2 itself is the sole plate 5. Compared with the weight of the equipment placed on the board, it is sufficiently small. Therefore, the load applied to the jack bolt 6 can be obtained as the load S applied to the support piece 2 obtained from the above formula (2) by ignoring the weight of the support piece 2 itself.

Next, the following formula (5) will be described. When the weight W is supported using n jack bolts 6, assuming that the loads Si (i is an integer of 1 to n) applied to each jack bolt 6 are all equal, the load applied per jack bolt 6 is W / N. On the other hand, when the load Si applied to each jack bolt 6 is not equal to W / n, the deviation ΔSi between the load Si and W / n is expressed by the following equation (3) from the above equation (2).
ΔSi = (Xi / L) × E × A (3)
However, Xi is the amount of strain of the support piece 2 due to the load ΔSi.

Here, making the load Si applied to each jack bolt 6 equal to W / n means that ΔSi is made zero in the following formula (4), that is, the height of each jack bolt 6 is adjusted by Xi. , Xi is set to zero.
Si + ΔSi = W / n (4)
Therefore, when Xi is obtained from the above formula (3) and the above formula (4), Xi is expressed as the following formula (5).
Xi = (WL / nEA) −ΔLi (5)
The direction of the necessary adjustment height of the jack bolt 6 is determined by the sign of the value of Xi. Specifically, when the value of Xi is positive, it means that the load Si is smaller than the reference value W / n, and when the value of Xi is negative, the opposite is shown. When the value is positive, the jack bolt 6 is rotated so as to be lifted upward, and when the value of Xi is negative, the rotation is reversed.

  Next, the setting operation of the sole plate 5 using the load measuring device 1 configured as described above will be described. The work is roughly divided into a setting process for setting the sole plate 5 on the upper surface of the jack bolt 6 and an adjustment process for adjusting the height of the jack bolt 6 again after placing the rotating machine 30 on the sole plate. .

  FIG. 3 shows a flowchart of the setting process. In the setting step, first, a flat liner 13 is installed on the upper surface of the foundation concrete 11 via the non-shrink mortar 12 (step Q1). Next, the support nut 10 is placed on the upper surface of the flat plate liner 13, and the jack bolt 6 is screwed onto the support nut 10 (step Q2). And after aligning the height of each jack bolt 6, each support piece 2 is mounted on the upper surface of each jack bolt 6 (process Q3). Thereafter, the strain gauge 3 is bonded to the side surface of each support piece 2, the strain gauge 3 and the measuring device 4 are connected by the wiring 7 (step Q 4), and finally the sole plate 5 is placed on the upper surface of the support piece 2. (Step Q5). At this time, the level of the sole plate 5 is once measured by, for example, a level, and if the level does not fall within a predetermined range, the jack bolt 6 is used until the level of the sole plate 5 falls within the predetermined range. Is adjusted (step Q6). Then, with the level of the sole plate 5 adjusted, the strain amount ΔLi of the support piece 2 due to the load of the sole plate 5 is measured by the strain gauge 3 (step Q7). Thus, based on the signal from the strain gauge 3 and the numerical values such as the weight W of the sole plate and the longitudinal elastic modulus E of the support piece 2 that are input to the arithmetic device 20 via the input unit 22 in advance, the arithmetic device 20. Thus, the load Si applied to each jack bolt 6 and the necessary adjustment height Xi of each jack bolt 6 are calculated, and the calculation results are respectively displayed on the display unit 21 (step Q8). In addition to the load Si applied to the jack bolt 6 and the necessary adjustment height Xi of each jack bolt 6, the display unit 21 also includes a deviation between the reference value W / n and the load Si, that is, ΔSi. Displayed.

When the calculation result displayed on the display unit 21 is confirmed and the load Si is not within the predetermined range, the worker can check the necessary adjustment height Xi displayed on the display unit 21 and the screw thread of the jack bolt 6. From the pitch, the number of rotations of the jack bolt 6 for changing the height of the jack bolt 6 by Xi is obtained. Then, the worker rotates each jack bolt 6 by the number of rotations to adjust the height of the jack bolt 6 (step Q9). At this time, since the adjustment amount of the jack bolt 6 is only Xi, the level of the sole plate 5 does not change from the level adjusted in the process Q6. If this operation is performed on all the sole plates 5, all the operations in the setting process are completed. In addition to the required adjustment height Xi, the display unit 21 may display the result of converting the required adjustment height Xi into the required rotational speed Yi of the jack bolt 6 by the following formula (6).
Yi = 2πXi / M (6)
Here, M is the pitch of the screw thread of the jack bolt 6.

  Next, an adjustment process is demonstrated with the flowchart shown in FIG. In the adjustment step, the rotating device 30 is placed on the upper surface of the sole plate 5 set in the setting step by a crane (not shown) (step R1). Next, the level of the rotating device 30 such as the rotating shaft or the bearing box is confirmed. If the level of the rotating device 30 is not within a predetermined range, the height of the jack bolt 6 is adjusted again (step). R2). When the adjustment of the level is finished, the load Si of each jack bolt 6 displayed on the display unit 21 is confirmed, and it is determined whether or not the jack bolt 6 needs to be readjusted (step R3). In this case, of course, the value of Si is a value including the load due to the weight of the rotating device 30. When readjustment is necessary, the worker adjusts the height by rotating the jack bolt 6 based on the necessary adjustment height Xi displayed on the display unit 21 (step R4), and sets the sole plate. All of the setting process and the adjustment process are completed.

  Then, after all the operations of the setting process and the adjusting process are completed, the casing of the rotating device 30 is fixed with a foundation bolt (not shown) embedded in the foundation concrete 11 in advance, the wiring 7 is removed, and the sole plate 5 is removed. Pour the grout material into the bottom surface. Thereby, all the installation work of the rotary machine 30 is completed. At this time, the support piece 2 and the strain gauge 3 are embedded in the grout together with the jack bolt 6.

  According to the above embodiment, the necessary adjustment height and adjustment direction of the jack bolt 6 can be grasped instantaneously from the measurement result of the strain amount of the support piece 2. Therefore, the load variation between the jack bolts 6 can be easily within a predetermined range without depending on the skill level of the operator, and the sole plate 5 can be set with high accuracy. Thereby, it is possible to prevent the load from being concentrated on a part of the jack bolts 6 or the grout material from being poured in a state where a gap is left between the jack bolts 6 and the sole plate 5. Further, since it is not necessary to determine whether or not each jack bolt 6 and the sole plate 5 are in proper contact with each other by a gap gauge or visual observation, it is possible to shorten the work time for setting the sole plate 5.

  In the above embodiment, the upper surface of the jack bolt 6 is flat. However, as shown in FIG. 5, for example, the jack bolt 40 whose upper surface is curved convexly with respect to the sole plate 5 and the lower surface side. Alternatively, a support piece 41 slidably formed with a recess corresponding to the convex shape of the jack bolt 6 may be used. If such a jack bolt 40 and the support piece 41 are used, for example, even if the flat liner 6 is not installed horizontally and the upper jack bolt 6 is installed inclined as shown by a broken line in FIG. 41 inclines following the lower surface of the sole plate 5. For this reason, the surface contact of the support piece 41 and the sole plate 5 is ensured, and it can prevent that the support piece 41 and the sole plate 5 hit one piece. In addition, even if the jack bolt 6 is installed at an inclination, there is no problem, and therefore it is not necessary to strictly adjust the level when the flat plate liner 6 is installed. For this reason, if such a jack bolt 40 and the support piece 41 are used, the time spent for the setting work of the sole plate 5 can be further shortened.

  The present invention is useful when setting a sole plate for equipment installation.

DESCRIPTION OF SYMBOLS 1 Load monitoring apparatus 2 Support piece 3 Strain gauge 4 Measuring apparatus 5 Sole plate 6 Jack bolt 7 Wiring 10 Support nut 11 Foundation concrete 12 Non-shrink mortar 13 Flat plate liner 20 Computation device 21 Display part 22 Input part 30 Rotating equipment 40 Jack bolt 41 Support piece

Claims (6)

A method of setting a sole plate for equipment installation,
A plurality of jack bolts that support the lower surface of the sole plate, and a support piece is inserted between the sole plate,
Based on the measurement result of the strain amount of the support piece, obtain the necessary adjustment height of each jack bolt to fit the variation in load between the plurality of jack bolts within a predetermined range,
A method for setting a sole plate, wherein the height of the jack bolt is adjusted based on the necessary adjustment height. The upper surface of the jack bolt is convexly curved,
The sole plate setting method according to claim 1, wherein the support piece has a concave surface corresponding to a curved shape of the jack bolt and a flat top surface. The support piece is elastically deformed in proportion to the load applied to the support piece,
A strain gauge for measuring the strain amount of the support piece is bonded to the side surface of the support piece,
The required adjustment height X of each jack bolt for keeping the variation in the load among the plurality of jack bolts within a predetermined range is obtained by the following equation. How to set the sole plate.
X = (WL / nEA) −ΔL
Where L is the height of the support piece, ΔL is the strain amount of the support piece, E is the longitudinal elastic modulus of the support piece, A is the cross-sectional area of the support piece, and n is the number of jack bolts that support the sole plate , W is the sum of the weight of the sole plate or the weight of the device placed on the upper surface of the sole plate and the sole plate. A load monitoring device for monitoring a load acting on a plurality of jack bolts supporting a lower surface of a sole plate for equipment installation,
A plurality of support pieces that are respectively inserted between the sole plate and the plurality of jack bolts and elastically deform in proportion to the load;
A strain gauge bonded to the side of the support piece and measuring the strain amount of the support piece;
A load having a calculation device for obtaining a necessary adjustment height of each jack bolt for keeping variation in load between the plurality of jack bolts within a predetermined range from a strain amount of each support piece. Monitoring device. The said arithmetic unit calculates | requires the required adjustment height X of each jack bolt for accommodating the dispersion | variation in the load between these jack bolts in a predetermined range with a following formula, It is characterized by the above-mentioned. Load monitoring device.
X = (WL / nEA) −ΔL
Where L is the height of the support piece, ΔL is the strain amount of the support piece, E is the longitudinal elastic modulus of the support piece, A is the cross-sectional area of the support piece, and n is the number of jack bolts that support the sole plate , W is the sum of the weight of the sole plate or the weight of the device placed on the upper surface of the sole plate and the sole plate. The upper surface of the jack bolt is convexly curved,
6. The load monitoring device according to claim 4, wherein the support piece has a concave surface corresponding to the shape of the convex curve of the jack bolt, and the upper surface is flat. .

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