JP2011131972A - Tool for hydraulic jack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for jacking up a load, particularly a heavy load, utilizing a general purpose hydraulic jack, and a jack-up method using the tool. <P>SOLUTION: The tool for the hydraulic jack includes a load engaging part 11 having, on the outer surface, an external thread adapted to an internal thread 41 of a jack-up threaded hole provided in a load to be jacked up; a cylindrical member 1 coaxially having a cylinder engaging part 12 having, on the inner surface, an internal thread adapted to an external thread 31 on the outer surface of a cylinder of the general purpose hydraulic jack 3; and an extension round rod 2 of a rod of the hydraulic jack, sliding in the cylindrical member 1. The method for jacking up the heavy load using the tool for the hydraulic jack is also provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a jig used when jacking up a heavy object using a general-purpose hydraulic jack.

  When lifting a load, especially a heavy object, lifting by a crane or a winch is generally used. However, when it is necessary to lift the load straight while maintaining the posture of the suspended load, a jack-up method is often used.

  For example, the inner casing of the steam turbine is divided into an upper inner casing and a lower inner casing by a horizontal flange, and a precisely made rotor and stationary blades are housed inside. In a large steam turbine used in a nuclear power plant or a thermal power plant, the weight of a single upper inner compartment divided into several parts reaches 40 tons.

  The internal casing contains high-pressure steam flowing through the interior of the inner casing, and in order to accurately maintain the relative positions of the moving blades attached to the rotor and the stationary blades attached to the inner casing, A large number of reamer bolts for fixing the upper internal casing are installed in the section, and the reamer section is fitted and positioned in the flange portion of the upper internal casing over a length of about 50 mm. In addition, strict accuracy is required for assembling and opening operations, such as a portion in which metal touch fitting is performed over 100 mm between adjacent upper internal compartments.

  In order to inspect and maintain the steam turbine, it is necessary to lift and open the upper internal casing. At that time, it is important to pull up straight until the fitting portion is cleared while keeping the posture, that is, keeping the flange portion horizontal, so as not to cause seizure at the fitting portion.

  Therefore, as shown in FIG. 4, holes in which the female screws for jack bolts are cut in advance are provided at the four corners of the flange portion of the upper internal casing. Tighten with a ratchet wrench and push it up little by little. Since there is a severe limitation that keeps the variation in lifting dimensions at the four corners during lifting within 3 mm, until the above fitting part is cleared, the jack bolts at the four corners are gradually pushed up by about 5 mm, It is necessary to check the posture by measuring the lifting dimensions each time. A crane is also used for lifting, but basically the role of lifting with the crane is after the fitting part is cleared, until then the main lifting is with a jack, and the crane is with a jack bolt. It is to assist.

  This lifting work requires not only jack bolts, impact wrench and ratchet wrench, but also a lot of tools such as air source and top, and operation of jack bolts and measurement of lifting dimensions at the four corners of the internal compartment. For this reason, a large number of workers must be assigned.

  When the number of tools is large, there is an increased risk of foreign objects falling into the opening when the passenger compartment is lifted.If many workers work in a small space, there is an unexpected risk of dropping the tool. It becomes easy to get up, and any management becomes difficult. In addition, when an impact wrench is used, the noise is severe and the working environment is poor. When a ratchet wrench is used, the load from 10 tons is pushed up with one bolt, so the burden on the worker is great.

  In order to solve these problems, it is conceivable to use a hydraulic jack. In Patent Document 1, in order to adjust the alignment of a large motor and a shaft joint of a pump driven by the motor, the large motor is jacked up using a special hydraulic jack designed and manufactured according to the device. Yes.

  However, in this method, it is necessary to design a hydraulic jack in consideration of the lifting of the object to be jacked up, and when considering the summary of the hydraulic jack later, the object to be jacked up and the jack Depending on the shape of the part that receives the reaction force of the up, a hydraulic jack must be produced exclusively for it, and since a general-purpose hydraulic jack cannot be used, it takes time and is not economical.

Japanese Patent Laid-Open No. 9-250550

  The problem to be solved by the present invention is that a general-purpose hydraulic jack is used, so that a large number of tools and jigs are not used, construction can be performed with a small number of workers, noise is not generated, and the burden on the workers is small. An object of the present invention is to provide an economical jig for jacking up a load, particularly a heavy load, and a jack-up method using the jig.

  The present invention relates to a load engaging portion having an external thread that fits an internal thread of a screw hole for jack-up provided on the load to be jacked up, and an internal thread that fits an external thread of a cylinder outer surface of a general-purpose hydraulic jack. It is the jig | tool for hydraulic jacks of the cylindrical member which has the cylinder engaging part which has in a coaxial.

  In a jack-up hole provided in a load to be jacked up, a female screw corresponding to a male screw such as a jack bolt scheduled to be used when the load is designed is cut. The female screw is not necessarily different from the male screw cut on the cylinder outer surface of a general-purpose hydraulic jack on hand.

  In view of this, an externally threaded load engaging portion that fits the internal thread of the screw hole for jacking up is provided on the outer surface of the cylindrical member. On the other hand, a cylinder engaging portion having a female thread fitted to the male thread on the cylinder outer surface of a general-purpose hydraulic jack held by hand is provided on the inner surface of the cylindrical member, and both are coaxially arranged.

  By aligning the female thread of the screw hole for jacking up on the outer surface of the cylindrical member and providing a load engaging part that fits the male thread, the male thread cut in the cylinder of a general-purpose hydraulic jack on hand can be jacked up. Jackup can be performed even if it does not match the female screw of the screw hole for jackup provided in the luggage.

  By arranging the load engaging portion and the cylinder engaging portion on the same axis, it is possible to give the load side a force that suits the design intention of the jack-up hole provided in the load. Since no biased force is applied to the jig, stable lifting can be performed.

  In general, the load engaging portion and the cylinder engagement portion are provided in series on the same axis, but when the male thread diameter on the outer surface of the cylinder is sufficiently smaller than the female thread diameter of the screw hole for jacking up, The external thread of the cylindrical member is cut off with a male screw that fits into the female screw of the screw hole for jacking up to form a load engaging part, and the female screw that fits into the male screw on the outer surface of the cylinder of a general-purpose hydraulic jack on hand is cut inside the cylinder member. It is also possible to shorten the overall length as a joint.

  By using the jig for the hydraulic jack of the present invention, select and use one that is suitable for the weight of the heavy object to be jacked up and the stroke of the necessary jack up from the general-purpose hydraulic jack on hand. Can do. In addition to the hydraulic jack, basically all that is needed is its hydraulic power source, hydraulic piping, and its control device, so there is no need to place a large number of tools and jigs near the work place, and less work is required. Can be constructed by a worker. Since there is no noise, the working environment is improved and the burden on workers is reduced. A hand-held general-purpose hydraulic jack can be used, and the jig of the present invention can be easily designed and manufactured on site, so that it is economical and economical.

  The present invention also provides a hydraulic jack jig comprising the cylindrical member according to claim 1 and a round bar for extending the rod of the hydraulic jack that slides in the cylindrical member.

  Select a person with a load-bearing force and stroke required for lifting from a general-purpose hydraulic jack on hand, and use the length of the rod of the hydraulic jack depending on the shape of the load and the position of the member receiving the reaction force. There may be a shortage. In that case, a round bar for extension that can withstand the required load may be attached to the end of the rod of the hydraulic jack.

  Since the extending round bar moves in the cylindrical member, the inner diameter of a part of the cylindrical member of the moving part of the extending member is set slightly larger than the diameter of the extending round bar, When the round bar for extension moves, the inner surface is slid. Thereby, stable lifting can be performed without the extending round bar being inclined or bent in the tubular member.

  Furthermore, the present invention is a method for jacking up a heavy object using the hydraulic jack jig according to claim 1 or claim 2.

  First, check the load of the heavy object to be jacked up and the female screw of the screw hole prepared for jacking up, determine the necessary jacking up stroke, and select the one that meets the conditions from the general-purpose hydraulic jacks on hand. Pick out. Next, the external thread of the cylinder of the selected hydraulic jack is examined. Based on these data, a cylindrical member and, if necessary, an extending round bar are designed and manufactured.

  The manufactured tubular member is fixed to the screw hole for jacking up heavy objects, and if an extension round bar is required, it is inserted into the fixed cylindrical member, and then the hydraulic jack is inserted into the cylindrical member. It sticks to. Prepare the hydraulic source, hydraulic piping, various measuring equipment, etc., and when the worker is in place, operate the hydraulic jack and start the lifting work.

  As in the conventional method, the operation may be performed while gradually lifting up by about 5 mm and checking the lifting dimensions, or may be performed by centrally controlling the strokes of the hydraulic jacks provided at the four corners of the heavy object. In this case, not only the number of workers operating the hydraulic jack is reduced, but also the number of workers involved in the measurement is reduced, and the risk of seizure during lifting is reduced.

  By adopting the hydraulic jack jig of the present invention, a general-purpose hydraulic jack on hand can be utilized, and it is easy and economical, does not use a large number of tools and jigs, and requires a small number of workers. The work environment is improved and the burden on workers is reduced.

It is the top view and sectional drawing which show one Example of the cylindrical member of the jig | tool for hydraulic jacks of this invention. It is a side view which shows one Example of the rod for extension of the rod of the hydraulic jack which slides in the cylindrical member of the jig | tool for hydraulic jacks of this invention. It is explanatory drawing which shows the lifting method using the jig | tool for hydraulic jacks of this invention. It is explanatory drawing which shows the point of the conventional jackup.

  Embodiments of the present invention will be described with reference to the drawings. Needless to say, the present invention is not limited to such an embodiment, and various modifications may be made to the specific structure within the scope of the present invention.

  FIG. 1 shows an embodiment of a cylindrical member 1 of a hydraulic jack jig according to the present invention. The cylindrical member 1 includes a load engaging portion 11 having a male screw on the outer surface that fits a female screw of a screw hole for jack up provided on the load to be jacked up, for example, a 2 inch-unified 8-thread screw, and a general-purpose product. A cylinder engagement portion 12 having a female thread on the inner surface that fits a male thread on the outer surface of the cylinder of the hydraulic jack, for example, a 2.5 inch-unified 10 thread, is coaxially provided.

  FIG. 3A shows the installation state of the cylindrical member 1. The load engaging portion 11 of the tubular member 1 is screwed and fixed to a female screw 41 provided on the load 4 to be jacked up. In order to fix firmly, the head 13 of the cylindrical member 1 is formed in a hexagon like a bolt head. On the other hand, the selected general-purpose hydraulic jack 3 is fixed to the cylinder engaging portion 12 by a male screw 31 provided on the outer surface of the cylinder.

  By using the cylindrical member 1, a general-purpose hydraulic jack can be easily applied to a hand-held hydraulic jack in which a male screw that does not match a female screw cut in a jack-up hole provided on a jack-up load is cut on the outer surface of the cylinder .

  Since the luggage engaging portion 11 and the cylinder engaging portion 12 are arranged on the same axis, the load receiving side and the reaction force are applied to the force corresponding to the design intention of the jack-up hole provided in the luggage 4. Stable lifting can be performed because no biased force is applied to the hydraulic jack or its jig.

  FIG. 2 shows an embodiment of the round bar 2 for extending the rod 32 of the hydraulic jack 3 sliding in the tubular member 1. The length of the cylindrical portion 14 of the cylindrical member 1 is determined by the shape of the luggage 4, particularly the thickness of the portion provided with a hole for the jack bolt, for example, the thickness of the flange of the upper internal casing. In many cases, the length exceeds the length of the rod 32 of the hydraulic jack 3, and even if the rod 32 of the hydraulic jack 3 fixed to the cylinder engaging portion 12 is extended, the base 5 that receives the reaction force of jack-up, for example, , Not reach the lower internal casing flange surface.

  In this case, the extending round bar 2 compensates for the insufficient length. As shown in FIG. 3A, when the tubular member 1 is attached to the load 4, the extension rod 2 is inserted into the tubular member 1, and the hydraulic jack 3 is attached, the hydraulic jack 3 is pulled. The length of the extending round bar 2 is determined so as to fill the gap between the inserted rod 32 and the base 5 receiving the reaction force.

  If pressure oil is guided from a hydraulic source (not shown) through the joint 33 and the hydraulic jack 3 is actuated to extend the rod 32, as shown in FIG. Jack up can be done without.

  When the extending round bar 2 moves, the inner diameter of a part 15 of the cylindrical member that moves in the cylindrical member 1 is set slightly larger than the diameter of the extending round bar 2, and when the extending round bar moves, Slide the inner surface. As a result, the lifting rod 2 can be stably lifted without being inclined or bent in the tubular member 1.

  On the other hand, the inner diameter of the portion 16 close to the cylinder engaging portion is set in accordance with the diameter of the rod 32 of the hydraulic jack. If the diameter is set to be slightly larger than the diameter of the sliding portion 15 and a head 21 having a diameter corresponding to the diameter is provided at the top of the round rod 2 for extension, the cylindrical member 1 is extended therein before being attached to the conventional 4. Even when the round bar 2 is set, it is easy to manage without falling off.

  As described above, by combining the extension round bar 2 with the cylindrical member 1, the applicable range of jack-up work using a general-purpose hydraulic jack on hand can be expanded. However, depending on the shape of the luggage, the extension round bar 2 may not be required, and only the cylindrical member 1 may be sufficient.

  It can be widely applied to lifting of luggage, especially heavy objects, especially when lifting straight while maintaining the attitude of the luggage in a factory or work site.

DESCRIPTION OF SYMBOLS 1 Cylindrical member 2 Extension round bar 3 Hydraulic jack 4 Luggage 5 Base 11 Luggage engagement part 12 Cylinder engagement part 13 Head of cylindrical member 21 Head of extension round bar 31 Male screw of cylinder of hydraulic jack 32 Same Rod 33 Same joint 41 Female thread of luggage

Claims (3)

  Luggage engagement part having a male thread on the outer surface that fits the female thread of the screw hole for jacking up provided on the luggage to be jacked up, and a cylinder unit having a female thread on the inner surface that fits the male thread on the outer surface of the cylinder of a general-purpose hydraulic jack A jig for a hydraulic jack of a cylindrical member having a joint portion on the same axis.   2. A hydraulic jack jig comprising: the cylindrical member according to claim 1; and a round bar for extending the rod of the hydraulic jack that slides in the cylindrical member.   A method for jacking up a heavy object using the hydraulic jack jig according to claim 1.

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