Support device for machinery

Abstract

To obtain a support device for machinery, which enables self-weight support and earthquake-resistant support of machinery and can reduce the installation space.SOLUTION: A support device for machinery comprises a hydraulic earthquake-resistant support mechanism using a cylinder, and a spring support mechanism that is concentrically installed on the outer peripheral side of the cylinder of the earthquake-resistant support mechanism and supports the load of the supported machinery by using spring force. The spring support mechanism also comprises a spring receiving seat fixed to the outer peripheral surface of the cylinder, a spring disposed on the spring receiving seat, an upper spring contraction cover that holds the upper part of the spring, a lower spring contraction cover that is disposed below the cylinder, and an own weight transmission rod that passes through the spring receiving seat and connects the upper spring contraction cover and the lower spring contraction cover. The support device comprises a flanged stopper that is provided on a piston rod to abut on the upper side of the lower spring contraction cover and is attached so that its position can be adjusted relative to the piston rod.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a support device for supporting piping systems such as cooling water piping and equipment such as circulation pumps that are installed in a nuclear power plant, and in particular to a support device for equipment that enables self-weight support and earthquake-resistant support of equipment such as piping. [Background technology]

[0002] Conventionally, for example, nuclear power plants are equipped with equipment such as cooling water piping and cooling water circulation pumps for circulating primary cooling water, etc. Since it is necessary to suppress sudden movements of these equipment due to earthquakes, etc., they are configured to be suspended and supported by a hydraulic earthquake-resistant support device (hydraulic vibration isolator) as described in, for example, JP 2012-127461 A (Patent Document 1).

[0003] The hydraulic earthquake-resistant support device described in Patent Document 1 includes a cylinder filled with hydraulic oil, a piston that divides the inside of the cylinder into two hydraulic chambers, and a piston rod inserted in the cylinder so as to be able to move in and out. In addition, in the hydraulic vibration isolator described in Patent Document 1, an oil reservoir is connected to the two hydraulic chambers of the cylinder, and a valve device is provided on this communication passage, which suppresses the sudden flow of hydraulic oil entering and leaving the two hydraulic chambers that expand and contract as the cylinder and the piston rod move relative to each other, while allowing the hydraulic oil to flow slowly, thereby reducing vibrations generated in the equipment being supported. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-127461 A Summary of the Invention [Problem to be solved by the invention]

[0005] The device in Patent Document 1 is a support device that has only an earthquake-resistant support mechanism, and does not take into consideration supporting the weight (load) of the equipment. In other words, the device in Patent Document 1 does not have a means for supporting the weight (load) of the equipment to be supported, and only has an earthquake-resistant support mechanism. Therefore, in order to support the weight of the equipment, a separate spring support device that uses springs to support the weight of the equipment is required.

[0006] This results in the following challenges: (1) If the earthquake-resistant support device and the spring support mechanism are installed separately, a large installation space will be required, and it may not be possible to install them depending on the surrounding structures. (2) It is possible to integrate the two support devices by connecting in series the spring support device that supports the weight of the equipment to the seismic support device, but the series connection structure would increase the overall length and require a large installation space in the axial direction. This would also reduce the structural strength of the entire support device (especially the buckling strength against compressive loads). Furthermore, since the transmission path of the support load is connected in series on the same axis, there is a risk that damage to either the seismic support device or the spring support device will cause both support devices to lose their functions.

[0007] An object of the present invention is to provide a support device for equipment that allows for self-weight support and earthquake-resistant support of equipment and that requires a small installation space. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention is characterized in that it provides a support device for equipment, which comprises a hydraulic earthquake-resistant support mechanism using a cylinder, and a spring support mechanism that is concentrically installed on the outer periphery of the cylinder of the earthquake-resistant support mechanism and uses spring force to support the load of the supported equipment. Effect of the Invention

[0009] According to the present invention, it is possible to obtain a support device for equipment that allows the weight of equipment to be supported and earthquake-resistant support for the equipment, and that requires a small installation space. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a vertical cross-sectional view showing a first embodiment of a support device for equipment according to the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 2 is an enlarged view of part A in FIG. [Figure 4] FIG. 4 is a view taken along line IV-IV in FIG. [Diagram 5] 2 is a vertical sectional view illustrating an operation of the support device shown in FIG. 1 when the device is installed. [Figure 6] FIG. 2 is an enlarged view of part A in FIG. 1, illustrating the operation when an earthquake load occurs. [Figure 7] FIG. 4 is a vertical cross-sectional view showing a second embodiment of the equipment support device of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the apparatus for supporting equipment according to the present invention will be described with reference to the drawings. In each drawing, the same reference numerals denote the same or corresponding parts. In the embodiment described below, an example of supporting cooling water piping that circulates primary cooling water in a nuclear power plant will be described, but the present invention is not limited to supporting cooling water piping, and can be similarly applied to supporting heavy equipment that undergoes thermal expansion, such as recirculation pumps and main steam system valves in nuclear power plants. Furthermore, the present invention is not limited to piping systems in nuclear power plants, and can be similarly applied as a support device for other general piping systems, and is particularly effective as a support device that provides self-weight support and seismic support for equipment that undergoes thermal expansion. EXAMPLES

[0012] A first embodiment of the device supporting device of the present invention will be described with reference to Figs. 1 to 6. First, a specific configuration of the present embodiment 1 will be described with reference to Fig. 1 to Fig. 4. Fig. 1 is a vertical cross-sectional view showing a specific configuration of a support device for equipment of the present invention, Fig. 2 is a view taken along line II-II in Fig. 1, Fig. 3 is an enlarged view of part A in Fig. 1, and Fig. 4 is a view taken along line IV-IV in Fig. 3.

[0013] The support device for equipment in the first embodiment is, for example, a support device for supporting a cooling water pipe that circulates primary cooling water in a nuclear power plant. The cooling water pipe through which the primary cooling water in a nuclear power plant flows needs to be prevented from sudden movement due to an earthquake or the like, and is configured to be suspended by a hydraulic earthquake-resistant support device (hydraulic vibration isolator; snubber). In addition, since high-temperature cooling water flows through the cooling water pipe, it is necessary to provide a spring support device (hanger) having a support mechanism that utilizes spring force in order to absorb expansion and contraction due to thermal expansion of the pipe and support its own weight.

[0014] Conventional support devices for equipment such as piping systems are supported by two support devices: a hydraulic vibration isolator (earthquake-resistant support device) as described in Patent Document 1 to suppress sudden movements due to earthquakes, etc., and a spring support device that supports the weight (load) of the equipment and can also absorb thermal expansion of the equipment. However, in order to support piping and the like with these two separate support devices, a large installation space is required to arrange the support devices, and costs increase due to the need to secure installation space within the building. Also, in nuclear power plants, it is often difficult to secure sufficient installation space due to the relationship with the components surrounding the piping.

[0015] Therefore, as shown in Figure 1, the support device for equipment in this embodiment 1 is configured to include a hydraulic earthquake-resistant support mechanism (snubber) using a cylinder to support equipment such as a piping system, and a spring support mechanism (hanger) that is concentrically arranged on the outside of this earthquake-resistant support mechanism and supports the weight (load) of the equipment by using a spring force, and the earthquake-resistant support mechanism and spring support mechanism are configured as a single support device.

[0016] A specific explanation will be given below with reference to FIG. In Figure 1, reference numeral 1 denotes a pipe such as a cooling water pipe of a nuclear power plant, which is the object to be supported, 2 denotes a structure (a structure that supports the pipe; a supporting framework) such as a beam of an architectural structure, 3 denotes a support device for supporting the pipe 1, and the pipe 1 is configured to be supported by the structure 2 via the support device 3.

[0017] That is, the part that supports the piping 1 is clamped by two-piece clamp 4 fastened with bolts (not shown), and a bracket 5 attached to this is connected to a bracket 6 on the support device 3 side, and further a bracket 7 provided on the upper part of the support device 3 is connected to a bracket 8 installed on the structure 2. In this way, the piping 1 is suspended and supported on the structure 2 via the support device 3.

[0018] Next, the configuration of the supporting device 3 will be described. The support device 3 of this embodiment 1 is equipped with a hydraulic earthquake-resistant support mechanism 3A that uses a cylinder containing hydraulic oil to support loads that change suddenly due to earthquakes, etc., and a spring support mechanism 3B that is concentrically arranged on the outside of this earthquake-resistant support mechanism 3A and supports the weight (load) of the supported equipment (pipes, etc.) using a spring reaction force.

[0019] The earthquake-resistant support mechanism 3A is composed of a cylinder (hydraulic cylinder) 11 filled with hydraulic oil, a piston 12 that divides the inside of the cylinder 11 into two cylinder chambers (hydraulic chambers) and reciprocates, and a piston rod 13 that is fixed to the center of the piston 12, extends in the axial direction (vertical direction) of the cylinder 11, and reciprocates while penetrating the cylinder 11. The inside of the cylinder chamber of the cylinder 11 is divided into two by the piston 12, upper and lower, to form upper and lower cylinder chambers 11a, 11b, and the hydraulic oil is sealed in these cylinder chambers 11a, 11b.

[0020] The piston rod 13 is divided into upper and lower halves, and is composed of an upper rod 13a and a lower rod 13b. The upper rod 13a and the lower rod 13b are connected by a rod length adjustment member 14 composed of a turnbuckle (rod length adjustment buckle) or the like so that the distance between them in the vertical direction can be adjusted. Therefore, the length of the piston rod 13 is configured to be adjustable by the rod length adjustment member 14, and this also makes it possible to adjust the position of the piston 12 with respect to the cylinder 11.

[0021] A flanged stopper 15 is screwed to the lower rod 13b, and this flanged stopper 15 is configured to be movable in the vertical direction (axial direction) relative to the lower rod 13b. By adjusting the position of this flanged stopper 15, the initial position of the support device 3, which combines the earthquake-resistant support mechanism and the spring support mechanism, can be appropriately set. Setting of this initial position will be described later.

[0022] An upper lid 11c is provided at the upper end of the cylinder 11, and a lower lid 11d closes the lower end of the cylinder 11. Reference numeral 16 denotes a holder that is fixed to the upper end of the upper cylinder chamber 11a and closes the cylinder chamber 11a to hold hydraulic oil within the cylinder chamber 11a. The upper rod 13a passes through the center of this holder 16 and is configured to be able to slide.

[0023] The lower end of the lower rod 13b is connected to the bracket 6 by means of screwing or the like and fixed with a nut 17. A pipe member 18 through which the upper rod 13a moves in and out is fixed to the upper cover 11c of the cylinder 11, and the bracket 7 is fixed to the upper end of this pipe member 18. Reference numeral 20 denotes a valve mechanism provided on the piston 12, and this valve mechanism 20 is composed of a valve body such as a poppet valve and an orifice. Since the valve body does not close in response to slow (slow) movements such as the displacement of equipment due to thermal expansion, the movement is not restricted, but in response to fast (sudden) movements such as earthquakes, the valve body closes, the pressure inside the cylinder rises, and a large reaction force (restriction force) is generated, so that the equipment can be supported and restricted. The details of the configuration of this valve mechanism 20 will be described later.

[0024] Next, the spring support mechanism 3B will be described. The spring support mechanism 3B is composed of an L-shaped spring seat 31 fixed to the outer circumferential surface of the cylinder 11, a spring 32 composed of a coil spring or the like arranged on the spring seat 31, an L-shaped upper spring contraction lid 33 that holds the upper part (upper surface) of the spring 32, a lower spring contraction lid 34 arranged so as to abut against the lower surface side of the flanged stopper 15 below the cylinder 11, and a weight transmission rod 35 that passes through the spring seat 31 and connects the upper spring contraction lid 33 and the lower spring contraction lid 34. The flanged stopper 15 is provided on the piston rod 13 so as to abut against the upper side of the lower spring contraction lid 34, and is attached so as to be positionally adjustable with respect to the piston rod 13 (upper rod 13a). 35a is a nut for attaching the weight transmission rod 35 to the upper spring contraction lid 33 and the lower spring contraction lid 34.

[0025] Reference numeral 36 denotes a lock bolt for applying a preload to the spring 32 to restrict the movement of the spring support mechanism 3B when the support device 3 is transported, etc., and this lock bolt 36 is provided to connect flanges 37 provided on the spring seat 31 and the upper spring contraction cover 33. This lock bolt 36 is removed when supporting the piping 1. Reference numeral 36a denotes a nut for attaching the lock bolt 36 to the upper and lower flanges 37.

[0026] FIG. 2 is a view taken along the line II-II in FIG. 1, showing the support device 3 of the present embodiment 1 from above. As shown in FIG. 2, the support device 3 of the present embodiment is configured such that a spring support mechanism 3B that supports the weight of the piping using a spring is concentrically arranged on the outer periphery of a hydraulic earthquake-resistant support mechanism 3A using a cylinder. In the example shown in FIG. 2, the weight transmission rod 35 is provided at four locations at equal intervals in the circumferential direction of the upper spring contraction cover 33. In addition, the spring seat 31 is fixed to the outer periphery of the cylinder 11 by welding or the like. The upper spring contraction cover 33 is arranged with a circumferential gap formed between it and the upper cover 11c of the cylinder 11, and is configured to be positioned by the spring 32, the weight transmission rod 35, and the nut 35a shown in FIG. 1. 1, this load acts on the upper spring contraction cover 33, which is configured to contract the spring 32 toward the spring seat 31 and move downward along the outer circumferential surface of the cylinder. This makes it possible to support the weight of the equipment such as the piping 1, and even if the equipment is displaced due to thermal expansion or the like, the displacement can be absorbed by the expansion and contraction of the spring 32.

[0027] Next, the configuration of the piston 12 shown in Fig. 1 will be described in detail with reference to Fig. 3 and Fig. 4. Fig. 3 is an enlarged view of part A in Fig. 1, and Fig. 4 is a view taken along line IV-IV in Fig. 3. 3, the piston 12 is divided into upper and lower halves, and is composed of an upper piston portion 12a and a lower piston portion 12b, which are arranged via a spacer 12c, and a space 12d is formed between the upper and lower piston portions 12a and 12b. Furthermore, the upper and lower piston portions 12a and 12b are each fixed to the upper rod 13a of the piston rod 13 by a lock nut 12e.

[0028] In addition, an oil passage 21 is formed in each of the upper and lower piston parts 12a, 12b, penetrating in the up-down direction (axial direction of the piston rod 13), and each oil passage 21 is provided with a valve body 22 (22a: upper valve body, 22b: lower valve body) constituted by a poppet valve or the like. In addition, the movement of each valve body 22 in the axial direction is restricted by a spring retainer 24 fixed to each piston part via a valve shaft 23. That is, a valve spring 25 is disposed between each valve body 22 and the spring retainer 24, and the valve body 22 is pushed in a direction to open the corresponding oil passage 21 by the valve spring 25. Specifically, the upper valve body 22a is pushed upward, and the lower valve body 22b is pushed downward.

[0029] 4, the spring retainer 24 is rectangular and fixed to a groove formed in the end face of the piston 12, and a gap 26 serving as an oil flow path is formed between the spring retainer 24 and the oil passage 21. Nut 27 is screwed onto the valve shaft 23 to engage with the spring retainer 24, and by adjusting the position of the nut 27, the passage area when the valve body 22 is fully open can be adjusted.

[0030] Next, the operation of the support device 3 of the first embodiment described above when it is installed will be described with reference to Fig. 5. Fig. 5 is a vertical sectional view illustrating the operation of the support device shown in Fig. 1 when it is installed. When the support device 3 for the pipe 1 is installed, the lock bolt 36 shown in FIG. 1 is removed so that the spring 32 can support the weight of the pipe 1 and bend.

[0031] First, the pipe 1 is kept horizontal using a jack or the like, and then connected to the support device 3. After that, when the jack is removed, the load (weight) mg (m: mass of the pipe, g: gravitational acceleration) of the pipe 1 acts downward on the spring 32 via the piston rod 13, the flanged stopper 15, the lower spring contraction cover 34, the weight transmission rod 35, and the upper spring contraction cover 33. As a result, the spring 32 contracts toward the spring seat 31, and the pipe 1 can be supported by its spring reaction force.

[0032] If the spring constant of the spring 32 is k and the amount of deflection when the spring 32 contracts and bends while supporting the pipe 1 is d, then mg ≈ kd, and therefore if the mass m of the pipe 1 and the spring constant k of the spring 32 are known, it is possible to predict in advance the amount of deflection d of the spring 32 when supporting the pipe 1. Therefore, as shown in Figure 5, the piston rod 13 descends by the amount of deflection d, and the position of the piston 12 is balanced at a position offset downward by d from the axial center of the cylinder 11.

[0033] In order to fully maintain the function of the earthquake-resistant support mechanism 3A, the piston 12 needs to be positioned approximately at the center of the cylinder in the axial direction. Therefore, the deflection amount d is calculated in advance, and when the support device 3 is installed, the position of the flanged stopper 15 relative to the piston rod 13 is adjusted and the position of the piston rod 13 is determined, taking into account the deflection amount d, so that the piston 12 is positioned d above the axial center of the cylinder 11.

[0034] After making this adjustment, by removing the jack or the like supporting the piping 1, the piping load acts on the spring 32, causing the spring 32 to bend by d, and the piston rod 13 to move downward by d. Therefore, with the piping 1 supported, the position of the piston 12 is located approximately in the center of the cylinder 11 in the vertical direction, allowing the earthquake-resistant support mechanism 3A to function sufficiently.

[0035] In this embodiment, not only the flanged stopper 15 but also a rod length adjustment member 14 is provided as a means for adjusting the position of the piston, which connects upper rod 13a and lower rod 13b above the flanged stopper 15 (between the flanged stopper 15 and the cylinder 11) and adjusts the distance between the upper rod 13a and the lower rod 13b to adjust the length of the piston rod 13. Even if the deflection amount d of the spring 32 caused by supporting the weight of the piping 1 is calculated and the flanged stopper 15 is adjusted so that the position of the piston 12 is the axial center position of the cylinder 11 after supporting the piping 1, the piston position may be slightly shifted and not appropriate after installation of the support device 3, or the piston position may change after long-term use.

[0036] In this embodiment, even after the support device 3 is installed, the piston position can be easily fine-tuned by the rod length adjustment member 14 without using a jack or the like. That is, since the rod length adjustment member 14 is composed of a turnbuckle or the like, the distance between the upper and lower rods 13a, 13b can be adjusted by adjusting the turnbuckle. Therefore, if the position of the piston 12 is shifted downward, for example, the position of the upper rod 13a can be moved upward by the rod length adjustment member 14, so that the position of the piston 12 can be adjusted to an appropriate position. This adjustment can be performed in a state where the load of the piping 1 is supported by the spring support mechanism 3B, and since the lower rod 13b is stationary while supporting the piping 1, the position of the upper rod 13a can be moved up and down by turning the rod length adjustment member 14. Therefore, the position of the piston 12 can be easily adjusted to an appropriate position, and there is no need to support the piping 1 with a jack or the like during this adjustment.

[0037] Next, the operation of the valve mechanism 20 will be described with reference to Figures 3 and 6. Figure 6 is an enlarged view of part A in Figure 1, and is a diagram for explaining the operation when an earthquake load occurs. As shown in Fig. 3, under normal circumstances, both the upper valve body 22a and the lower valve body 22b are pushed by the valve spring 25 to open the oil passage 21. Therefore, when the pipe 1 is slowly displaced due to thermal expansion or the like, the piston 12 moves upward or downward in the cylinder 11 at a relatively slow speed via the piston rod 13 depending on the direction of displacement. For example, when the piston 12 rises slowly, the oil in the upper cylinder chamber 11a flows into the oil passage 21 from the gap around the valve body 22a, and flows into the space 12d from the gap 26 of the spring retainer 24 part shown in Fig. 4. The oil that has flowed into the space 12d then passes through the gap 26 of the spring retainer 24 part provided on the lower piston part 12b, passes through the oil passage 21 formed in the lower piston part 12b, and flows out to the lower cylinder chamber 11b side from the gap around the lower valve body 22b.

[0038] In other words, the valve body 22 is not closed in response to slow movements such as thermal expansion, and therefore the movement is not restricted. Therefore, the earthquake-resistant support mechanism 3A can tolerate displacement of the piping 1 at a relatively slow speed due to thermal expansion or the like. At this time, the spring support mechanism 3B can absorb the displacement of the pipe 1 by the expansion and contraction of the spring 32, and support the weight of the pipe 1 itself.

[0039] On the other hand, when an earthquake or the like occurs and a seismic load is applied to the piping 1, the displacement speed of the piping 1 due to the seismic load is fast, so the piston 12 is displaced suddenly. For example, when the piston 12 rises suddenly due to an earthquake, the oil in the upper cylinder chamber 11a tries to flow into the oil passage 21 through the gap around the valve body 22a, but since the gap around the valve body 22a is small, a sufficient amount of oil cannot flow into the oil passage 21, and the pressure in the cylinder chamber 11a rises suddenly. This sudden increase in pressure pushes the valve body 22a downward and blocks the oil passage 21, as shown in Figure 6, so that a large reaction force (restraining force) is generated in the cylinder chamber 11a, which suppresses the rise of the piston 12, and this makes it possible to suppress the piping 1 from shaking significantly.

[0040] Similarly, when the piston 12 suddenly descends due to an earthquake, the lower valve body 22b is pushed upward to close the oil passage 21, so that the vibration of the piping 1 can be similarly suppressed. Even in this case, the spring support mechanism 3B can absorb high speed displacement of the pipe 1 due to an earthquake or the like by the expansion and contraction of the spring 32 and support the weight of the pipe 1 itself.

[0041] In this embodiment, an example has been described in which the valve mechanism 20 constituted by the oil passage 21, the valve body 22, etc. is provided in the piston 12. However, an oil passage connecting the two cylinder chambers 11a, 11b partitioned by the piston may be constituted by piping or the like provided outside the cylinder 11, and the valve mechanism may be provided in the oil passage constituted by this piping or the like.

[0042] As described above, the equipment support device of the first embodiment has the following advantages. (1) A hydraulic earthquake-resistant support mechanism 3A using a cylinder and a spring support mechanism 3B that supports the load of equipment are arranged concentrically, and these two mechanisms are configured as one support device. In other words, since the spring support mechanism 3B is provided concentrically on the outside of the earthquake-resistant support mechanism 3A, the support device 3 having both earthquake-resistant support and spring support functions can be configured compactly. Therefore, the single support device 3 can support both the weight of equipment such as piping 1 and earthquake-resistant support at the same location, making it possible to plan the layout of equipment and design the structure of equipment in a space-saving manner in nuclear power plants, etc. (2) The single support device 3 can suppress the shaking of the equipment during an earthquake, and the spring support mechanism 3B can support the weight of the equipment. Moreover, it can absorb and support the displacement of the equipment due to thermal expansion, etc. (3) The spring support mechanism 3B that supports the weight of the equipment is provided with a flanged stopper 15 that is connected to the piston rod 13 of the earthquake-resistant support mechanism 3A. This flanged stopper 15 allows the vertical position of the piston rod 13 to be adjusted according to the deflection of the spring 32 when supporting the weight of the equipment, so that the position of the piston 12 fixed to the piston rod 13 can be adjusted to an appropriate position, and the function of the earthquake-resistant support mechanism 3A can be fully ensured. (4) Since the rod length adjustment member 14 for adjusting the length of the piston rod 13 is provided above the flanged stopper 15, even after the support device 3 is installed, the position of the piston 12 can be finely adjusted by the rod length adjustment member 14 without using a jack or the like. Therefore, even if the position of the piston 12 becomes inappropriate after the support device 3 is installed, the piston position can be adjusted to an appropriate position by adjusting the rod length (adjusting the position of the upper rod 13a) with the rod length adjustment member 14. EXAMPLES

[0043] A second embodiment of the device support device of the present invention will be described with reference to Fig. 7. Fig. 7 is a vertical cross-sectional view showing the second embodiment of the device support device of the present invention. In Fig. 7, parts with the same reference numerals as in Figs. 1 to 6 are the same or corresponding parts, and in the description of this second embodiment, the description of the same parts as in the above-mentioned first embodiment will be omitted, and the description will focus on the different parts.

[0044] The difference between the present embodiment 2 and the embodiment 1 is that the upper rod 13a of the piston rod 13 is extended to below the flanged stopper 15, and a rod length adjustment member is not provided above the flanged stopper 15, but a rod length adjustment member 14a is provided at a position below the flanged stopper 15. This rod length adjustment member 14a may be configured as a turnbuckle or the like, as in the embodiment 1. That is, the lower rod 13b may be screwed into the upper part of the bracket 6 and fixed with a nut 17, and the lower rod 13b and the lower end of the upper rod 13a may be connected with the rod length adjustment member 14a.

[0045] Alternatively, a connecting member for connecting to the piston rod 13 (upper rod 13a) may be attached to the upper end of the bracket 6, and a rod length adjustment member 14a such as a screw may be provided between this connecting member and the lower end of the piston rod 13, allowing the distance between the piston rod 13 and the connecting member to be adjusted.

[0046] The other configurations are the same as those of the first embodiment, and even if a rod length adjustment member 14a is provided between the lower end of the piston rod 13 and the bracket 6 connected to the piston rod 13 as in the second embodiment, it is possible to obtain substantially the same effects as those of the first embodiment.

[0047] That is, when the support device 3 for the pipe 1 is installed, the lock bolt 36 is removed so that the spring 32 can support the weight of the pipe 1 and bend. Next, after the pipe 1 is kept horizontal by using a jack or the like, the bracket 5 on the clamp 4 side that holds the pipe 1 is connected to the bracket 6 on the support device 3 side, and the position of the flanged stopper 15 is adjusted so that the piston 12 is positioned approximately at the center of the axial direction of the cylinder 11, taking into consideration the bending of the spring 32 when the support device 3 supports the weight of the pipe 1. After that, the jack that supported the pipe 1 from below is removed, and the pipe 1 is supported by the support device 3. In this way, it becomes possible to support the pipe by positioning the piston 12 at an appropriate position, that is, approximately at the center of the axial direction of the cylinder 11. Therefore, the pipe can be supported in a state in which the function of the earthquake-resistant support mechanism 3A can be sufficiently maintained.

[0048] In this embodiment, the lower end of the piston rod 13 (upper rod 13a) and the lower rod 13b (or the connecting member described above) are connected below the flanged stopper 15, and a rod length adjustment member 14a is provided to adjust the distance between them to adjust the length of the piston rod 13. Therefore, even if the position of the piston rod 13 moves up or down due to the adjustment of the flanged stopper 15, the piping 1 can be supported horizontally by adjusting the rod length adjustment member 14a accordingly. The operation of the spring support mechanism 3B is similar to that of the first embodiment described above.

[0049] In addition, in the case where the piston 12 is slightly displaced from the appropriate position after the installation of the support device 3 or the piston position has changed after a long period of use, the following is done in this embodiment 2. That is, similar to the above-mentioned initial installation, the pipe 1 is held horizontally using a jack or the like, and in this state, the flanged stopper 15 is adjusted to adjust the position of the piston 12. At this time, the flanged stopper 15 is adjusted taking into consideration the amount of deflection of the spring 32 so that the piston 12 is in an appropriate position when the jack is removed. Also, the rod length adjustment member 14a is adjusted as necessary so that the pipe 1 can be supported horizontally even if the position of the piston rod 13 (upper rod 13a) changes by adjusting the flanged stopper 15. In this way, the piston 12 can be adjusted to an appropriate position and the pipe 1 can be supported horizontally.

[0050] As described above, in this embodiment 2 as well, the same effect as in the above-described embodiment 1 can be obtained at the time of initial installation of the support device 3. Note that, when adjusting the position of the piston 12 after installation of the support device 3, it is necessary to keep the pipe 1 horizontal by using another support means such as a jack.

[0051] As described above, according to each embodiment of the present invention, a hydraulic earthquake-resistant support mechanism using a cylinder and a spring support mechanism that supports the load of equipment are concentrically arranged, and a flanged stopper that adjusts the position of the piston rod of the earthquake-resistant support mechanism is provided, so that a support device for equipment that can support the weight of equipment such as piping and provide earthquake-resistant support can be obtained in a space-saving manner. In addition, by adjusting the flanged stopper, the position of the piston can be adjusted to an appropriate position while supporting the equipment with the spring support device, so the function of the earthquake-resistant support mechanism can be fully maintained.

[0052] Furthermore, if a rod length adjustment member for adjusting the length of the piston rod is provided above the flanged stopper, it is possible to obtain the effect of fine-tuning the piston position without using a jack or the like, even after the support device has been installed.

[0053] The present invention is not limited to the above-mentioned embodiment, and includes various modified examples. For example, in the above-mentioned embodiment, an example of supporting cooling water piping for circulating primary cooling water in a nuclear power plant has been described, but the present invention can also be applied to support equipment such as recirculation pumps and main steam system valves in nuclear power plants, which are non-self-supporting equipment, piping, valves, pumps, etc. in other power plants and chemical plants, and general piping systems such as piping in air conditioning systems. In particular, the present invention is suitable for earthquake-resistant support of heavy loads that undergo thermal expansion. Furthermore, the above-described embodiment has been described in detail in order to easily explain the present invention, and the present invention is not necessarily limited to having all of the configurations described. [Explanation of symbols]

[0054] 1: piping, 2: structure, 3: support device, 3A: earthquake-resistant support mechanism, 3B: spring support mechanism, 4: Clamp, 5,6,7,8: Bracket, 11: cylinder, 11a, 11b: cylinder chamber, 11c: upper cover, 11d: lower cover, 12: piston, 12a: upper piston part, 12b: lower piston part, 12c: spacer, 12d: space, 12e: lock nut, 13: piston rod, 13a: upper rod, 13b: lower rod, 14, 14a: rod length adjustment member, 15: flanged stopper, 16: holder, 17: nut, 18: pipe member, 20: valve mechanism, 21: oil passage, 22: valve body, 22a: upper valve body, 22b: lower valve body, 23: valve stem, 24: spring retainer, 25: valve spring, 26: gap, 27: nut, 31: spring seat, 32: spring, 33: upper spring contraction cover, 34: lower spring contraction cover, 35: weight transmission rod, 35a: weight transmission rod nut, 36: lock bolt, 36a: lock bolt nut, 37: Flange.

Claims

1. A hydraulic earthquake-resistant support mechanism using a cylinder; a spring support mechanism that is concentrically installed on the outer periphery of the cylinder of the earthquake-resistant support mechanism and supports the load of the supported equipment using a spring force; A support device for equipment, comprising:

2. 2. The device supporting apparatus according to claim 1, The earthquake-resistant support mechanism is a support device for equipment, characterized in that it comprises a cylinder filled with hydraulic oil, a piston that divides the inside of the cylinder into two cylinder chambers and reciprocates, and a piston rod fixed to the center of the piston, extending in the axial direction of the cylinder, penetrating the cylinder and reciprocating.

3. The device for supporting equipment according to claim 2, the spring support mechanism includes a spring seat fixed to an outer circumferential surface of the cylinder, a spring disposed on the spring seat, an upper spring contraction lid that holds an upper portion of the spring, a lower spring contraction lid that is disposed below the cylinder, and a weight transmission rod that passes through the spring seat and connects the upper spring contraction lid and the lower spring contraction lid, A support device for equipment, comprising: a flanged stopper that is provided on the piston rod so as to abut against an upper side of the lower spring contraction lid and is attached so as to be positionably adjustable relative to the piston rod.

4. The device for supporting equipment according to claim 3, The piston rod is divided into two parts, upper and lower, consisting of an upper rod and a lower rod, and is characterized in that it is equipped with a rod length adjustment member that connects the upper rod and the lower rod so that the vertical distance between them can be adjusted.

5. The device for supporting equipment according to claim 4, A support device for equipment, characterized in that the rod length adjustment member is disposed between the flanged stopper and the cylinder.

6. The device for supporting equipment according to claim 2, A support device for equipment, comprising: an oil passage that communicates two cylinder chambers partitioned by the piston; and a valve mechanism having a valve body provided in this oil passage, wherein the valve body is configured to close the oil passage in response to sudden movement of the piston, but not to close the oil passage in response to slow movement of the piston.

7. The device for supporting equipment according to claim 6, A support device for equipment, wherein the valve mechanism is provided on the piston.

8. The device for supporting equipment according to claim 7, The piston is divided into two parts, an upper piston part and a lower piston part, and the upper piston part and the lower piston part are arranged with a spacer between them to form a space, a valve body for opening and closing each oil passage, the valve body of the upper piston portion being arranged so as to be pressed upward by a valve spring to open the oil passage, and the valve body of the lower piston portion being arranged so as to be pressed downward by a valve spring to open the oil passage.

9. The device for supporting equipment according to claim 3, A support device for equipment, characterized in that the position of the flanged stopper is set so that when the spring is bent by supporting the equipment, the position of the piston is approximately in the center of the axial direction of the cylinder.

10. The device for supporting equipment according to claim 5, This device supports equipment, characterized in that the flanged stopper and the rod length adjustment member are adjusted so that when the spring is bent, the position of the piston is approximately in the center of the axial direction of the cylinder and the supported equipment is in a predetermined position by supporting the equipment.

11. The device for supporting equipment according to claim 3, A support device for equipment, characterized in that flanges for attaching lock bolts are provided on the spring support seat and the upper spring contraction cover, and the distance between the spring support seat and the upper spring contraction cover can be fixed by the lock bolt.

12. The device for supporting equipment according to claim 4, A support device for equipment, characterized in that the rod length adjustment member is arranged below the flanged stopper.

Images