JP2010155288A - Bolt tensioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt tensioner which shortens a work time for connecting a piston to a bolt and then fastening a nut to the bolt. <P>SOLUTION: The bolt tensioner has: an annular jig 1 openable along a circumferential direction; a plurality of cylinder chambers 2 arranged along the circumferential direction; a common passage 3 which supplies a hydraulic pressure to the cylinder chambers 2 at the same time; a plurality of pistons 4; a plurality of corresponding bolt connecting parts 5 connected to a plurality of bolts 6; a plurality of corresponding piston connecting parts 7; and a plurality of reaction receiving members 8 for receiving a reaction R from a flange F1. Between the corresponding bolt connecting parts 5 and the corresponding piston connecting parts 7, connecting structures 5a and 7a are formed for engaging the pistons 4 with the bolts 6 so as to be disengaged along an axial direction in accordance with a relative positional movement between the bolt connecting parts 5 and the piston connecting parts 7. The reaction receiving members 8 are arranged between the plurality of bolts 6 along the circumferential direction, separated from the bolts 6, are extended along the radial direction of the jig 1 to be longer than a radial width of the piston 4, and abut on the flange F1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bolt tensioner, and more particularly to a bolt tensioner capable of simultaneously pulling a plurality of bolts.

When a plurality of objects to be fastened, for example, two opposing flanges are fixed to each other using bolts and nuts, the principle is as follows:
(1) When the nut is tightened on the bolt inserted through the two flanges, the bolt is pulled in the axial direction and slightly extended;
(2) At this time, a repulsive force to return to the bolt, that is, an axial force is generated on the bolt;
(3) This axial force acts on the two flanges sandwiched between the bolt head and the nut via the nut, whereby the two flanges are fixed to each other.

  The hydraulic bolt tensioner generates the axial force by mechanically pulling the bolt using hydraulic pressure. The operator tightens the nut in a state where the axial force is generated, seats the nut on the fastened object, and releases the hydraulic pressure after the seating. Since the bolt is pulled by hydraulic pressure when the nut is tightened, the operator can tighten the nut with a small operating force.

In Patent Document 1, a plurality of bolts and nuts arranged along a circumferential direction on a flange, a ring-shaped jig mounted on the flange, and a ring-shaped extension on the ring-shaped jig. A pneumatic pipe, an outer peripheral oil passage formed by cutting the outer peripheral surface of the ring-shaped jig, and a radial oil formed along the radial direction in the ring-shaped jig and communicating with the outer peripheral oil passage A bolt tensioner having a path and a plurality of drive devices arranged in a ring shape on the ring-shaped jig is disclosed.
The outer peripheral oil passage is formed by covering a groove formed by cutting the outer peripheral surface of the ring-shaped jig with a ring-shaped cover and welding the cover to the outer peripheral surface.
Each of the plurality of drive devices is connected in a radial direction and serrated and connected to the tip of the bolt, and connected to the air pressure pipe and air pressure is applied to the locking member to connect the serration. A pneumatic cylinder that operates in the radial direction, and a hydraulic cylinder that is connected to the outer peripheral oil passage and operates in the axial direction for pulling the bolt.
The hydraulic cylinder includes a housing that abuts along the axial direction of the locking member and the bolt and strokes along the axial direction, and an in-shaft oil that is loaded into the housing and communicates with the radial oil passage. A hollow piston provided with a passage, and a hydraulic chamber formed between the hollow piston and the housing in the axial direction and communicating with the in-shaft oil passage.
An outer cylinder through which the bolt passes is fixed to the lower surface of the ring-shaped jig. The lower end surface of the outer cylinder is in contact with the upper surface of the flange and receives the reaction force applied to the hollow piston.

  In Patent Document 2, a puller screwed into a stud bolt tip, a cylindrical housing through which the puller and the puller are inserted, a split nut that is serrated and fitted to a tip of the puller that protrudes above the cylindrical housing, A piston loaded between the upper end surface of the cylindrical housing and the lower end surface of the split nut; a nut loosening hole for allowing a spanner to access a nut formed on a lower peripheral surface of the cylindrical housing and fastened to a stud bolt; A bolt tensioner is disclosed.

In Patent Document 3, a plurality of cylinder devices are stacked in series along the axial direction of the bolt, and the outer periphery of the bolt is interposed between the cylinder device and the upper flange below the cylinder device. A bolt tensioner is disclosed in which a cylindrical base for receiving the reaction force of the cylinder device is arranged.
The bolt tensioner measures the elongation of the bolt and adjusts the hydraulic pressure supplied to the cylinder device according to the elongation of the bolt.

  In Patent Document 4, a bolt is inserted into an outer peripheral side step portion of a stepped flange, a first bolt tensioner having an inner peripheral side step portion of the flange as a reaction force receiving surface, and a concentric circle on the outer peripheral portion of the flange. Among the plurality of bolts arranged, there are disclosed second bolt tensioners that pull several of the bolts and at the same time use the end faces of the other several bolts as reaction force receiving surfaces.

  In Patent Document 5, for a plurality of bolts arranged concentrically on the outer peripheral portion of the flange, a plurality of cylinder devices provided by the number of the bolts and a number of the plurality of cylinder devices are provided. A bolt tensioner having a pressure hose connecting the cylinder device and the hydraulic pump is disclosed. In this bolt tensioner, a spacer serving as a support column is disposed between the support plate of the bolt tensioner and the upper flange in the axial direction. The diameter of the spacer is set smaller than the diameter of the bolt or nut.

Japanese Patent Publication No.46-2847 JP-A-8-257932 JP 11-216625 A JP 2000-263459 A JP-A-8-11063

The bolt tensioner of Patent Document 1 has the following problems:
・ Installation of the locking member on the bolt is complicated;
-Since a locking member is attached to the front end of the bolt that fixes the flange and the hydraulic cylinder is disposed under the locking member, it is necessary to lengthen the bolt for fixing the flange. Also, the entire bolt tensioner is enlarged in the axial direction;
-Since an oil passage is formed on the outer peripheral surface of the ring-shaped member, when a large hydraulic pressure is supplied, the seal on the outer peripheral surface side of the oil passage may be insufficient, or the ring-shaped cover may fall off;
-Since the reaction force receiving outer cylinder is arranged around the bolt that fixes the flange, that is, in the immediate vicinity of the bolt, it is difficult to attach a spanner to the nut when tightening the nut to the bolt.

The bolt tensioner of Patent Document 2 has the following problems:
・ Installation of split nut (locking member) to the puller is complicated;
A long puller is required to lock the split nut (locking member) at the tip protruding above the cylindrical housing of the puller, and the entire bolt tensioner is enlarged in the axial direction;
-Since the reaction force receiving outer cylinder is arranged around the bolt that fixes the flange, that is, in the immediate vicinity of the bolt, it is difficult to attach a spanner to the nut when tightening the nut to the bolt.
-Since the reaction force outer cylinder is placed around the stud bolt that fixes the flange, that is, in the immediate vicinity of the stud bolt, it is difficult to attach a spanner to the nut when tightening the nut on the bolt. Moreover, since the nut loosening hole is formed in the cylindrical housing, the strength of the cylindrical housing that receives a large reaction force is reduced.

The bolt tensioner of Patent Document 3 has the following problems:
-Since the cylinder device is stacked in multiple stages, the bolts become longer and the entire bolt tensioner is enlarged in the axial direction.
-Since the reaction force receiving cylindrical base is arranged around the bolt that fixes the flange, that is, in the immediate vicinity of the bolt, it is difficult to attach a spanner to the nut when tightening the nut on the bolt.
・ In general, an ultrasonic measuring device is used as a device for measuring the elongation of the bolt. However, since the device is large in scale and takes time to install, it is necessary to apply hydraulic pressure to the bolt. It is actually difficult to measure the elongation of a bolt, that is, in real time.

The bolt tensioner of Patent Document 4 has the following problems:
-When the reaction force receiving surface is arranged on the inner peripheral side of the flange, especially when the flange is small, there is a possibility that the area of the reaction force receiving surface cannot be sufficiently secured and the support of the bolt tensioner is not stable.
-If some of the bolts are used as reaction force receiving surfaces, the bolt tensioners must be attached and removed one by one, and it takes a long time to finish tightening the nuts on all the bolts.

The bolt tensioner of Patent Document 5 has the following problems:
・ There are as many cylinder devices as there are bolts, and there are as many hydraulic supply hoses as there are many cylinder devices, so it takes time to connect the hoses and the handling of the hoses is complicated. There is a problem that obstructs the nut fastening work
-Since the diameter of the spacer serving as the reaction force receiving surface is small, the bolt tensioner support may become unstable when tension is applied to the bolt.

  By the way, in a power plant, with a periodic inspection or the like, there is a case where the operation of the turbine is stopped and the bolt fixing the flange of the turbine combustion pipe is replaced. At this time, if the working time is long, the turbine shutdown period becomes long, resulting in a large loss. Further, around the flange of the turbine combustion pipe, a combustion pipe and other pipes and various cords are routed. Accordingly, when a conventional bolt tensioner is used for the above replacement work, it interferes with piping or the like, and it takes time and effort to attach it. Therefore, at present, the bolt tensioner is not used for the work.

An object of the present invention is to provide a bolt tensioner capable of shortening the work time from connecting a piston to a bolt to fastening a nut to the bolt even in a narrow work site with a simple configuration.
Another object of the present invention is to provide a bolt tensioner capable of quickly connecting a piston to a bolt.
Another object of the present invention is to provide a bolt tensioner that can apply tension to a bolt in a stable state and fasten a nut to the bolt.

  In a first aspect, the present invention is a bolt tensioner that assists a screwing operation of a nut to the bolt by pulling a plurality of bolts inserted through the plurality of fastened members along the axial direction. A jig that can be opened and closed or divided along the circumferential direction, a plurality of cylinder chambers formed inside the jig and arranged along the circumferential direction, and a plurality of cylinders formed inside the jig. A common flow path that allows the chambers to communicate with each other and supply fluid pressure to all the cylinder chambers simultaneously, and a fluid pressure that is loaded into each of the plurality of cylinder chambers and supplied to the plurality of cylinder chambers simultaneously through the common flow path. A plurality of pistons that can be simultaneously stroked along the axial direction of the jig and the plurality of pistons. A plurality of free bolt connection portions (piston mounting portions or piston integrated portions), a plurality of piston connection portions (bolt mounting portions or bolt integrated portions) respectively provided at ends of the bolts, and the pair A coupling structure that is formed between the bolt connection portion and the piston connection portion and that releasably engages the piston and the bolt along at least the axial direction according to relative positional movement between the two; A plurality of members interposed between the jig and the member to be fastened along the axial direction, and simultaneously biased to the opposite side of the piston in the stroke direction by the fluid pressure and receiving a reaction force from the member to be fastened A bolt tensioner having a reaction force receiving member and capable of simultaneously pulling a plurality of bolts.

  According to a second aspect of the present invention, there is provided a bolt tensioner for assisting screwing operation of a nut onto the bolt by pulling a plurality of bolts inserted through the plurality of fastened members along the axial direction. A jig that can be opened and closed or divided along the circumferential direction, a plurality of cylinder chambers formed inside the jig and arranged along the circumferential direction, and a plurality of cylinders formed inside the jig. A common flow path that allows the chambers to communicate with each other and supply fluid pressure to all the cylinder chambers simultaneously, and a fluid pressure that is loaded into each of the plurality of cylinder chambers and supplied to the plurality of cylinder chambers simultaneously through the common flow path. And a plurality of pistons that can be simultaneously stroked along the axial direction of the jig, and the piston and the bolt are coupled directly or indirectly in a combined state, and in a divided state. A split sleeve that is released from the coupling, an elastic member that can urge the split sleeve in the combined state toward the piston and the bolt, and between the jig and the fastened member along the axial direction. A plurality of reaction force receiving members that are urged simultaneously by the fluid pressure in the direction opposite to the stroke direction of the piston and receive a reaction force from the fastened member; Provide bolt tensioners.

  According to a third aspect of the present invention, there is provided a bolt tensioner for assisting screwing operation of a nut onto the bolt by pulling a plurality of bolts inserted through the plurality of fastened members along the axial direction. A jig that can be opened and closed or divided along the circumferential direction, a plurality of cylinder chambers formed inside the jig and arranged along the circumferential direction, and the cylinder chambers formed inside the jig. The fluid pressure can be simultaneously supplied to all the cylinder chambers communicating with each other, and the fluid pressure can be supplied to each of the plurality of cylinder chambers through the common flow channel and loaded in the plurality of cylinder chambers. A plurality of pistons that can be stroked simultaneously along the axial direction of the tool, and a plurality of pistons that are respectively provided on the plurality of pistons and that can be connected to the plurality of bolts. A pair of bolt connection portions, a plurality of pair piston connection portions respectively provided at end portions of the plurality of bolts, and a portion between the pair bolt connection portion and the pair piston connection portion. A coupling structure for releasably engaging the piston and the bolt along the axial direction according to the position movement, and interposed between the jig and the fastened member along the axial direction, A plurality of reaction force receiving members that are simultaneously urged to the opposite side of the stroke direction of the piston by fluid pressure and receive reaction force from the fastened member, the reaction force receiving member in the circumferential direction A bolt tensioner that is arranged between the plurality of bolts along the radial direction of the jig, extends longer than the radial width of the piston, and contacts the fastened member. I will provide a.

The effect of the bolt tensioner of the present invention is exemplified below:
-The common flow path for supplying fluid pressure to multiple pistons is formed inside the jig, which simplifies the structure of the bolt tensioner and hinders the connection work between the bolt and piston and the nut fastening work. Since the number of hoses and cords is reduced and the work becomes easier, the work time from connecting the piston to the bolt and fastening the nut to the bolt is shortened even in a narrow work site;
-Equal tension (axial force) can be applied to all bolts simultaneously through a common flow path.
-Since the jig can be freely opened and closed, the bolt tensioner of the present invention can be suitably applied to a fastening operation of a flange having a pipe attached at the center.

In particular, the effect of the bolt tensioner according to the first aspect of the present invention is exemplified below:
-A coupling structure that releasably engages along the axial direction in accordance with the relative positional movement between the pair of bolts and the pair of pistons, preferably in accordance with one of the rotational operations. Thus, the piston can be quickly connected to the bolt with one touch.
-The bolt length or the axial height of the bolt tensioner can be shortened by arranging a bolt connection portion and a piston connection portion on one side of the jig, particularly between the jig and the object to be fastened.

In particular, the effects of the bolt tensioner according to the second aspect of the present invention are exemplified below:
-Piston and bolt connection structure is greatly simplified;
-Since the split sleeve can be freely coupled to both the piston and the bolt, the number of parts required to connect the two is reduced.

In particular, the effect of the bolt tensioner according to the third aspect of the present invention is exemplified below:
The reaction force receiving member 8 extends longer than the radial width of the piston along the radial direction of the jig and comes into contact with the member to be fastened, so that the reaction force receiving member 8 is effective in contact with the flange F1. Because the force receiving area is increased and the reaction force receiving surface extends in the radial direction, the mounting state of the jig or bolt tensioner to the fastened member is stable, and tension is applied to the bolt in a stable state. A nut can be fastened to the bolt;
-Since a bolt tensioner is supported with respect to a to-be-fastened member in the stable state, when fastening two flanges, the precision of the clearance gap between two flanges can be raised, for example.
-Since the bolt and the reaction force receiving member are separated from each other, it is easy to attach a tightening tool such as a spanner to the nut even in a narrow work site.

  In the description of the claims, the reference numerals given to the constituent elements in each claim are only for facilitating the understanding of the invention, and the invention according to each claim is described in the embodiment or the drawings. It is not intended to be limited to the contents of.

  In a preferred embodiment of the present invention, the coupling structure engages the bolt connection portion and the piston connection portion so as to be releasable along the axial direction by a rotation operation of half or less. Through the rotation operation, the engagement between the bolt and the piston in the axial direction is further ensured. Preferably, the coupling structure employs serration coupling, coupling between a concave portion and a convex portion, or coupling utilizing a fitting between a ball and a ball groove. Separately, the bolt and the piston are preferably connected by a simple operation via a sleeve, in particular a split sleeve.

  In a preferred embodiment of the present invention, the bolt connection provided on the piston is provided integrally or separately from the piston. In the case of integral, for example, the piston and the bolt connection portion are rotatably supported by the jig, and the rotation operation of the bolt connection portion causes the bolt connection portion to be axially connected to the piston connection portion provided on the bolt. Engage. In the case of a separate body, for example, the bolt connection portion is rotatably supported on the piston, and the bolt connection portion is engaged with the piston connection portion provided on the bolt in the axial direction by the rotation operation of the bolt connection portion. .

  In a preferred embodiment of the present invention, the piston connection portion provided on the bolt is provided integrally or separately from the bolt. In the case of integration, for example, a bolt connection portion is formed at the tip of the bolt. In the case of a separate body, for example, the bolt connection portion is screwed to the bolt.

  In a preferred embodiment of the present invention, the bolt and piston are connected between the jig and the member to be fastened, so that it is not necessary to lengthen the bolt and the axial height of the bolt tensioner is reduced. Can do.

  In a preferred embodiment of the present invention, the nut can be screwed in using spaces between the plurality of bolts and the plurality of reaction force receiving members.

  A bolt tensioner according to a preferred embodiment of the present invention is disposed at a predetermined interval along the circumferential direction, and a plurality of gap measuring means for measuring gaps between the plurality of fastening members, Control means capable of controlling in real time the fluid pressure supplied simultaneously to the plurality of cylinder chambers via the common flow path based on the measurement result of the gap measuring means. In this bolt tensioner, the tension applied to the bolt is controlled based on the measurement result of the gap between the members to be fastened. Therefore, the length of the bolt is measured and the control is performed based on the measurement result. The configuration of the measuring device is simplified as compared with the case where it is executed. As a result, according to the bolt tensioner according to this embodiment of the present invention, the working time is further shortened, and the bolt tensioner is also suitably applied to the connection of a flange having a small diameter and dense bolts. In addition, the relationship between the gap and the applied fluid pressure should be measured in advance, and in actual work, the axial force applied to the gap and the bolt tensioner should be properly managed by controlling the fluid pressure. Can do.

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a developed plan view schematically showing a state in which a bolt tensioner according to an embodiment of the present invention is connected to a flange. FIG. 2 is an external view of a bolt tensioner according to an embodiment of the present invention.

  Referring to FIG. 1, a bolt tensioner according to an embodiment of the present invention pulls a plurality of bolts 6 inserted through a plurality of flanges (fastened members) F1 and F2 along the axial direction. It is a bolt tensioner that assists the screwing operation of the nut N. Pipes P are respectively connected to the center portions of the plurality of flanges (fastened members) F1 and F2. A plurality of bolts 6 are inserted in concentric circles around the plurality of flanges F1, F2. A gasket G is provided between the axial directions of the plurality of flanges (fastened members) F1 and F2. By fastening the nuts N to the plurality of bolts 6, the plurality of flanges (fastened members) F <b> 1 and F <b> 2 and the pipes P and P are connected.

  Referring to FIGS. 1 and 2, the bolt tensioner is a ring-shaped jig 1 that can be opened and closed or divided along the circumferential direction, and a plurality of bolt tensioners formed inside the jig 1 and arranged along the circumferential direction. A common flow path 3 that is formed inside the jig 1 and that allows a plurality of cylinder chambers 2 to communicate with each other and supply fluid pressure such as hydraulic pressure, water pressure, or air pressure to all the cylinder chambers 2 simultaneously. A plurality of pistons 4 that can be simultaneously stroked along the axial direction of the jig 1 by fluid pressures respectively loaded into the plurality of cylinder chambers 2 and simultaneously supplied to the plurality of cylinder chambers 2 through the common flow path 3, and the plurality of pistons 4 A plurality of bolt connection portions 5 that are respectively connectable to the plurality of bolts 6, a plurality of piston connection portions 7 that are respectively provided at ends of the plurality of bolts 6, and the axial direction A plurality of reaction force receiving members 8 interposed between the jig 1 and the flange F1 and simultaneously urged to the opposite side of the stroke direction of the piston 4 by the fluid pressure and receiving the reaction force R from the flange F1, have.

  In particular, referring to FIG. 2 and FIG. 5 to be described later, the reaction force receiving member 8 is arranged apart from the bolts 6 between the plurality of bolts 6 along the circumferential direction, and extends along the radial direction of the jig 1. The piston 4 extends longer than the radial width of the piston 4 and is in contact with the flange F1. The reaction force receiving member 8 is fixed to the jig 1 by mounting bolts 8a.

  The bolt tensioner is formed between the bolt connection portion 5 and the piston connection portion 7 so that the piston 4 and the bolt 6 can be released at least along the axial direction in accordance with the relative positional movement between the two. It has a coupling structure (5a, 7a) to be engaged.

  3 (A) and 3 (B) are diagrams for explaining the details of the bolt / piston coupling structure shown in FIG. 2, wherein FIG. 3 (A) is a piston connection portion and FIG. 3 (B) is a bolt. The connection part is shown.

  In particular, referring to FIG. 1 and FIG. 3 (A), the piston connection portion 7 attached to the bolt 6 is annular, and is screwed into the male screw 6a of the bolt 6 with a female screw 7b formed on the inner peripheral surface thereof. An outer angle screw 7a is formed on the outer peripheral surface. The outer corner screws 7a have a circumferential length of 60 degrees, and are formed at intervals of 60 degrees.

  In particular, referring to FIG. 1, FIG. 2 and FIG. 3 (B), the counter bolt connecting portion 5 integral with the piston 4 is cup-shaped, and an inner angle screw 5a is formed on the inner peripheral surface thereof. . The inner angle screws 5a have a circumferential length of 60 degrees, and a plurality of inner angle screws 5a are formed at intervals of 60 degrees.

  The square screws 5a and 7a are serrated by a rotation operation of 1/6 rotation of the knob 4a provided on the head of the piston 4 or the bolt connection portion 5, and the bolt connection portion 5 and the piston connection portion. 7 is releasably engageable along the axial direction, and constitutes the above-described coupling structure (5a, 7a).

  The bolt connection portion 5 and the piston connection portion 7, that is, the coupling structure (5a, 7a) is located between the jig 1 and the flange F1, so that the bolt 6 is shortened and the axial height of the bolt tensioner is increased. Is compact.

  In addition, the bolt tensioner is disposed at a predetermined interval along the circumferential direction, and a potentiometer 9 serving as a plurality of gap measuring means for measuring gaps between the plurality of flanges F1 and F2, respectively, and a plurality of potentiometers 9 And a computer 10 which is a control means capable of controlling in real time the fluid pressure supplied simultaneously to the plurality of cylinder chambers 2 via the common flow path 3 based on the measurement results of the above. The computer 10 controls the discharge pressure and flow rate of the pump 11 connected to the inlet 3 a of the common oil passage 3 based on the measurement results of the plurality of potentiometers 9.

  FIG. 4 is a partially broken cross-sectional view for explaining the cylinder chamber of the jig shown in FIGS. 1 and 2. Referring to FIG. 4, in the jig 1, a cylinder chamber 2 is formed in the internal space where the piston 4 is inserted, between the large diameter portion (spool) of the piston and the inner flange of the jig 1. . The plurality of cylinder chambers 2 respectively provided in the plurality of pistons 4 arranged concentrically communicate with each other by a common flow path 3 described in detail below. A return spring 17 is loaded between the jig 1 and the piston 4.

  FIG. 5 is a bottom view of the jig shown in FIG. 2 and shows a common flow path formed inside the jig. Referring to FIG. 5, seven flow paths 3, 3 extend in a straight line from the outer peripheral surface of the annular jig 1 toward the inside. The seven channels 3,..., 3 are all formed on a straight line by cutting, and the seven channels 3, .., 3 constitute a regular octagonal side. The seven flow paths 3, 3 communicate with the cylinder chamber 2, and communicate with each other via the cylinder chamber 2 to form a common flow path 3. One ends of the seven flow paths 3, 3 are located on the outer peripheral surface of the jig 1. One end of the other flow path 3 is plugged except that one end of one flow path 3 opens to become the inlet 3a of the common flow path 3.

  Next, the hinge part 12 and the opening / closing part 13 of the jig 1 and the path of the common flow path 3 in the hinge part 12 will be described in detail.

  6 is a side view of the hinge portion of the jig shown in FIG. Referring to FIG. 6, the annular jig 1 is configured to be openable and closable so as to be easily connected to the flanges F1 and F2 to which the pipe P is connected, as shown in FIG. The jig 1 is composed of semicircular first and second jigs 1a and 1b. The first and second jigs 1 a and 1 b are connected by a hinge part 12 and can be opened and connected by an opening / closing part 13.

  In the hinge portion 12, one end portion of the first jig 1a includes a pair of convex portions 14 and 14 on both sides in the axial direction, and one end portion of the second jig 1b includes a convex portion 15 at the center in the axial direction. ing. The convex portion 15 is inserted into a concave portion between the pair of convex portions 14 and 14. The pair of convex portions 14 and 14 and the convex portion 15 are inserted into the hinge pin 16 along the axial direction, so that the first and second jigs 1a and 1b can swing with respect to each other. Thus, the connection part 12 of the 1st and 2nd jig | tool 1a, 1b is formed from the fitting structure of a recessed part and a convex part. According to this uneven | corrugated fitting structure, when a big tension is applied to the volt | bolt 6 shown in FIG. 1 compared with the shape coupling | bonding structure of convex parts, generation | occurrence | production of backlash is prevented highly.

  The opening / closing part 13 has basically the same configuration as the hinge part 12. However, the hinge pin 16 can be inserted and fixed, that is, the opening / closing part 13 can be opened and closed, and the common flow path 3 to be described later is not formed.

  Next, the path of the common flow path 3 in the hinge portion 12 will be described with reference to FIG. From the right side to the left side in FIG. 6, the common flow path 3 extends in the surface direction in the axial center of the first jig 1 a, then extends upward in the axial direction, and subsequently protrudes. After extending in the plane direction in the portion 14 and exceeding the hinge pin 16, it extends downward in the axial direction, and extends in the second jig 1 b along the axial direction. It extends along the surface direction in the axial center of 1b. A portion extending along the axial direction of the common flow path 3 is also formed in a straight line inside the jig 1 by cutting, and the opening is plugged. In this way, by configuring the common flow path 3 from the portion extending in the plane direction and the portion extending in the axial direction in the hinge portion 12, all the pistons 4 can be opened and closed while the jig 1 can be freely opened and closed. At the same time, fluid pressure can be supplied.

  Since the common oil passage 3 according to the present embodiment is formed inside the jig 1, it has an advantage that it is easy to seal and does not interfere with the operation. Moreover, since the common flow path 3 is comprised from the combination of the flow path formed linearly, it can be easily formed by linear cutting.

  A method of operating the bolt tensioner according to the embodiment of the present invention described above will be described. Referring to FIG. 1 and FIG. 3 (A), the operator screws the piston connection portion 7 into the end portion of the bolt 6 that is inserted through the plurality of flanges F1 and F2 and to which the nut N is screwed. .

  Referring to FIGS. 1, 2, and 5, the operator opens the opening / closing part 13 of the jig 1, inserts the pipe P into the center of the jig 1, and then closes and locks the opening / closing part 13.

  Referring to FIGS. 1, 3A, and 3B, the operator lowers the jig 1 toward the plurality of flanges F1, F2, and the bolt connection portion 5 and the piston connection portion 7. , The piston 4 and the bolt connection portion 5 are further lowered, and the piston 4 or the bolt connection portion 5 is further rotated by 1/6 rotation so that the square screws 5a and 7a are connected to each other. Serration coupling is performed, and the bolt 6 and the piston 4 are engaged in the axial direction. In this way, the connection operation between the piston connection portion 6 and the bolt connection portion 5, that is, the connection operation between the bolt 6 and the piston 4 can be easily performed with one touch.

  The above operation is performed on all bolts 6 and pistons 4. At this time, as shown in FIG. 1, the lower surfaces of the plurality of reaction force receiving members 8 are in contact with the upper surface of the flange F1. Each of the reaction force receiving members 8 extends longer than the radial width of the piston 4 along the radial direction of the jig 1 and comes into contact with the flange F1, so that the reaction force receiving member 8 comes into contact with the flange F1. Since the effective reaction force receiving area is increased and the reaction force receiving surface extends in the radial direction, the mounting state of the jig 1 or the bolt tensioner according to this embodiment with respect to the plurality of flanges F1, F2 is stable. In addition, tension can be applied to the bolt 6 in a stable state.

  With reference to FIG. 1, the operator connects a pump to the inlet 3 a of the common flow path 3.

  Subsequently, the computer 10 or the operator uses the fluid pressure supplied simultaneously to the plurality of cylinder chambers 2 through the common flow path 3 based on the measurement result of the potentiometer 9 that measures the gaps between the plurality of flanges F1 and F2. To control. As a result, all the bolts 6 arranged in a concentric manner are simultaneously applied with equal tension, and the pressure in all the cylinder chambers 2 is maintained in a state where the parallelism of the plurality of flanges F1 and F2 is maintained. The pressure is rapidly increased until the gap reaches a predetermined value. When the gap reaches a predetermined value, the operator engages the nut N with a spanner and tightens the bolt 6. At this time, since the reaction force receiving member 8 is in a position not interfering with the fitting of the spanner to the nut N, the nut N is tightened quickly and easily. After completing the tightening operation of all the nuts N, the fluid pressure supplied to the plurality of cylinder chambers 2 is quickly released simultaneously, and thereafter, the bolt tensioners are removed in the reverse order of the steps described above.

  A bolt and piston coupling structure according to another embodiment applied to the bolt tensioner of the present invention will be described. FIGS. 7A to 7D are views for explaining a bolt and piston coupling structure according to another embodiment applicable to the bolt tensioner shown in FIGS. It is process drawing explaining the connection operation of a volt | bolt and a piston.

  Referring to FIG. 7A, a female screw 7a that engages with the male screw 6a of the bolt 6 is formed on the inner peripheral surface of the annular pair piston connection portion 7, and the convex portions 7a are spaced 120 degrees apart on the outer peripheral surface. It is formed with. On the other hand, grooves 5a having portions extending in the axial direction and portions extending in the radial direction are formed at intervals of 120 degrees on the annular wall of the cup-shaped counter bolt connecting portion 5 that rotates integrally with the piston 4. .

  A connection operation between the groove 5a and the convex portion 7a constituting the coupling structure (5a, 7a) will be described. Referring to FIG. 7A, the operator screws the piston connection portion 7 into the end of the bolt 6 to which the nut N is screwed. Referring to FIG. 7B, the operator moves the bolt connection portion 5 toward the piston connection portion 7, and referring to FIG. 7C to FIG. 7D, the bolt connection portion 5. , The rotational position of the piston connection portion 7 is aligned, and the convex portion 7a is fitted into the axially extending portion of the groove 5a, and then the convex portion 7a is rotated into the groove 5a by at most 1/3 rotation operation. The piston 4 is engaged with the bolt 6 so as to be releasable along the axial direction.

  A bolt and piston coupling structure according to still another embodiment applied to the bolt tensioner of the present invention will be described. FIG. 8 is a view for explaining a coupling structure of a bolt and a piston according to still another embodiment applicable to the bolt tensioner shown in FIGS. 1 and 2.

  Referring to FIG. 8, split sleeves 18 and 19 having a semicircular cross section are employed for coupling the bolt 6 and the piston 4. A first outer angle screw 20 is formed on the outer peripheral surface of the piston 4 (or the bolt connection portion 5). A second outer angle screw 21 is formed on the outer peripheral surface of the bolt 6 (or the piston connection portion 7). First inner angle screws 22 are formed on the inner peripheral surfaces of the split sleeves 18 and 19, respectively. Annular grooves 23 are formed on the outer peripheral surfaces of the split sleeves 18 and 19, respectively. The annular grooves 23 of the split sleeves 18 and 19 can communicate with each other in the circumferential direction when the split sleeves 18 and 19 are combined. An annular elastic member 24 can be fitted into the annular groove 23. The division sleeves 18 and 19 are coupled to the piston 4 and the bolt 6 in a combined state, and the coupling is released in the divided state. The elastic member 24 is capable of urging the divided sleeves 18 and 19 in the combined state toward the piston 4 and the bolt 6.

  The operation for coupling the bolt 6 and the piston 4 will be described. The operator brings the piston 4 and the bolt 6 close to each other in the axial direction, and fits the first inner angle screw 22 of the split sleeves 18 and 19 to the first and second outer angle screws 20 and 21 aligned in the axial direction, respectively. After combining the split sleeves 18 and 19 into an annular shape, the elastic member 24 is fitted into the annular groove 23. Due to the urging force of the elastic member 24, the split sleeves 18 and 19 are firmly coupled to the piston 4 and the bolt 6 in the axial direction, and the piston 4 is connected to the bolt 6.

  The bolt tensioner of the present invention is suitably used for connecting a plurality of flanges fastened by a plurality of bolts and nuts, for example, a flange for a turbine combustion pipe. The bolt tensioner of the present invention can be applied to various objects to be fastened, regardless of whether or not there are gaps between a plurality of objects to be fastened and those having other members such as gaskets between them. Furthermore, the bolt tensioner of the present invention is applied to a replacement operation of a bolt fixing a flange of a turbine combustion pipe in a power plant or the like.

It is a plane development view showing typically signs that a bolt tensioner concerning one example of the present invention is connected to a flange. It is an external view of the bolt tensioner which concerns on one Example of this invention. (A) And (B) is a figure explaining the detail of the coupling | bonding structure of the volt | bolt and piston shown in FIG. 2, (A) is a piston connection part, (B) has shown the volt | bolt connection part. . It is a partially broken sectional view for demonstrating the cylinder chamber of the jig | tool shown in FIG.1 and FIG.2. It is a bottom view of the jig | tool shown in FIG. 2, Comprising: The common flow path formed in the jig | tool inside is shown. It is a side view of the hinge part of the jig | tool shown in FIG. (A)-(D) are process drawings for demonstrating the coupling | bonding structure of the volt | bolt and piston which concern on the other Example which can be applied to the bolt tensioner shown in FIG.1 and FIG.2. It is a figure for demonstrating the coupling structure of the volt | bolt and piston which concern on the further another Example applicable to the bolt tensioner shown in FIG.1 and FIG.2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Jig 2 Cylinder chamber 3 Common flow path, flow path 3a Inlet 4 Piston 4a Knob 5 To bolt connection part (piston mounting part or piston integrated part)
5a Internal angle screw, groove 6 Bolt 7 Piston connection part (bolt mounting part or bolt integrated part)
7a Outside angle screw, convex part 5a, 7a Connection structure 8 Reaction force receiving member 8a Mounting bolt 9 Pontimeter (gap measuring means)
10 Computer (control means)
DESCRIPTION OF SYMBOLS 11 Pump 12 Hinge part 13 Opening / closing part 14,14 A pair of convex part 15 Convex part 16 Hinge pin 17 Return spring 18,19 Split sleeve 20 1st external angle screw 21 2nd external angle screw 22 1st internal angle screw 23 Annular groove 24 Elastic member (rubber rubber)
R reaction force

Claims (5)

A bolt tensioner for assisting screwing operation of a nut (N) on the bolt by pulling a plurality of bolts (6) inserted through the plurality of fastened members (F1, F2) along the axial direction,
An annular jig (1) that can be opened and closed or divided along the circumferential direction;
A plurality of cylinder chambers (2) formed inside the jig and arranged along the circumferential direction;
A common flow path (3) that is formed inside the jig and that allows the plurality of cylinder chambers to communicate with each other to supply fluid pressure to all the cylinder chambers simultaneously;
A plurality of pistons (4) that can be simultaneously stroked along the axial direction of the jig by fluid pressures respectively loaded into the plurality of cylinder chambers and simultaneously supplied to the plurality of cylinder chambers through the common flow path;
A plurality of bolt connection portions (5) that are respectively provided on the plurality of pistons and are connectable to the plurality of bolts;
A plurality of piston connection portions (7) respectively provided at ends of the plurality of bolts;
A coupling structure formed between the pair of bolts and the pair of pistons and releasably engages the piston and the bolt along at least the axial direction in accordance with relative positional movement between the two. (5a, 7a)
A plurality of members interposed between the jig and the member to be fastened along the axial direction, and simultaneously biased to the opposite side of the piston in the stroke direction by the fluid pressure and receiving a reaction force from the member to be fastened A reaction force receiving member (8);
A bolt tensioner capable of simultaneously pulling a plurality of bolts.   2. The bolt tensioner according to claim 1, wherein the coupling structure is configured to releasably engage the bolt connection portion and the piston connection portion along the axial direction by a rotation operation of half or less. . A bolt tensioner for assisting screwing operation of a nut (N) on the bolt by pulling a plurality of bolts (6) inserted through the plurality of fastened members (F1, F2) along the axial direction,
An annular jig (1) that can be opened and closed or divided along the circumferential direction;
A plurality of cylinder chambers (2) formed inside the jig and arranged along the circumferential direction;
A common flow path (3) that is formed inside the jig and that allows the plurality of cylinder chambers to communicate with each other to supply fluid pressure to all the cylinder chambers simultaneously;
A plurality of pistons (4) that can be simultaneously stroked along the axial direction of the jig by fluid pressures respectively loaded into the plurality of cylinder chambers and simultaneously supplied to the plurality of cylinder chambers through the common flow path;
A split sleeve (18, 19) that is coupled to the piston and the bolt directly or indirectly in a combined state and is released in a split state;
An elastic member (24) capable of urging the split sleeves (18, 19) in the combined state toward the piston and the bolt;
A plurality of members interposed between the jig and the member to be fastened along the axial direction, and simultaneously biased to the opposite side of the piston in the stroke direction by the fluid pressure and receiving a reaction force from the member to be fastened A reaction force receiving member (8);
A bolt tensioner capable of simultaneously pulling a plurality of bolts. A bolt tensioner for assisting screwing operation of a nut (N) on the bolt by pulling a plurality of bolts (6) inserted through the plurality of fastened members (F1, F2) along the axial direction,
An annular jig (1) that can be opened and closed or divided along the circumferential direction;
A plurality of cylinder chambers (2) formed inside the jig and arranged along the circumferential direction;
A common flow path (3) formed in the jig and capable of supplying fluid pressure to all the cylinder chambers communicating with the plurality of cylinder chambers simultaneously;
A plurality of pistons (4) that can be simultaneously stroked along the axial direction of the jig by fluid pressures respectively loaded into the plurality of cylinder chambers and simultaneously supplied to the plurality of cylinder chambers through the common flow path;
A plurality of bolt connection portions (5) that are respectively provided on the plurality of pistons and are connectable to the plurality of bolts;
A plurality of piston connection portions (7) respectively provided at ends of the plurality of bolts;
A coupling structure formed between the pair of bolt connecting portions and the pair of piston connecting portions and releasably engages the piston and the bolt along at least the axial direction according to relative positional movement between the two. (5a, 7a)
A plurality of members interposed between the jig and the member to be fastened along the axial direction, and simultaneously biased to the opposite side of the piston in the stroke direction by the fluid pressure and receiving a reaction force from the member to be fastened A reaction force receiving member (8);
Have
The reaction force receiving member (8) is arranged between the plurality of bolts along the circumferential direction and spaced from the bolts, and is longer than the radial width of the piston along the radial direction of the jig. Extending to contact the fastened member,
Bolt tensioner that can pull multiple bolts at the same time. A plurality of gap measuring means (9) that are spaced apart from each other by a predetermined distance along the circumferential direction and measure the gaps between the plurality of fastening members at the same time while supplying the fluid pressure to at least the plurality of cylinder chambers. )When,
Control means (10) capable of controlling in real time the fluid pressure supplied simultaneously to the plurality of cylinder chambers via the common flow path based on the measurement results of the plurality of gap measuring means;
The bolt tensioner according to any one of claims 1 to 4, characterized by comprising:

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