JP2011093026A - Fastening tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening tool easily and efficiently performing fastening work of a bolt and a nut of a screw fastening body of a pipe joint in a short period of time. <P>SOLUTION: The fastening tool is equipped with: a body 2; a first socket mounting part 4 provided on the body 2; a fastening screw 8 provided at a position opposed to the first socket mounting part 4 of the body 2 and advanceable/retreatable in a direction of the first socket mounting part 4; a second socket mounting part 12 provided on a distal end of the fastening screw 8; a first socket 15 detachably mounted to the first socket mounting part 4 and capable of fitting any one of a head part of the bolt 31 of the screw fastening body 30 or the nut 33; and a second socket 18 detachably mounted to the second socket mounting part 12 and capable of fitting the other one of the head part of the bolt 31 of the screw fastening body 30 or the nut 33. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tightening tool, and more particularly to a tightening tool effective for tightening a threaded fastener of a pipe joint that connects two pipe members in a watertight and expandable manner.

  In general, in a hydroelectric power plant, water stored in an aquarium or reservoir in a high place is guided to a water turbine in a low place through a waterway laid using a slope of a mountain and the water turbine is driven. Power generation is performed through a generator directly connected to the power source.

  Since hydrostatic pressure corresponding to the drop when the water turbine is stopped and water hammer pressure generated by changes in the flow velocity in the pipe act on the waterway of such a hydroelectric power plant, the strength is sufficient to withstand those pressures. PC concrete pipes and steel hydraulic iron pipes are used.

  When hydraulic iron pipes are used for a conduit, the hydraulic iron pipes may expand and contract due to changes in the outdoor temperature and water temperature during the season and day and night, and there is a risk of adversely affecting the water turbine and its associated equipment. Are connected in a watertight and expandable manner through a pipe joint, and the expansion and contraction of each hydraulic iron pipe is absorbed by the pipe joint, thereby preventing adverse effects on the water turbine and its associated equipment.

An example of a pipe joint that connects two hydraulic iron pipes in a watertight and telescopic manner is described in Patent Documents 1 and 2.
The pipe joint is fitted on the outer peripheral side between the connection ends of two adjacent hydraulic iron pipes, and one end in the axial direction is integrally fixed to the outer peripheral side of the connection end of one hydraulic iron pipe by welding. A cylindrical sleeve, a ground packing packed in a stuffing box formed between the inner peripheral surface of the sleeve and the outer peripheral surface of the other hydraulic iron pipe, and slidable on the outer peripheral surface of the other hydraulic iron pipe In addition, a cylindrical packing presser that presses the ground packing toward the inside of the stuffing box at the tip part, and a predetermined distance in the circumferential direction between the other end part in the axial direction of the sleeve and the rear end part of the packing presser And a plurality of screw fastening bodies to be fastened.

  In the pipe joint having such a structure, the bolt and nut of the screw fastening body are tightened with a predetermined torque, the gland packing is pressed inward of the stuffing box at the tip of the packing presser, and the gland packing inner and outer periphery By pressing the surface against the outer peripheral surface of the hydraulic iron pipe and the inner peripheral surface of the sleeve, it is possible to seal between two adjacent hydraulic iron pipes and to connect both the hydraulic iron pipes in a telescopic manner.

  And in the water conduit using the pipe joint of the above configuration, each hydraulic iron pipe repeatedly expands and contracts due to changes in the outside air temperature and water temperature during the season and day and night, so that the ground packing of the pipe joint wears. The sealing performance of the ground packing gradually decreases, and water leakage may occur between the connecting ends of two adjacent hydraulic iron pipes.

  For this reason, the bolts and nuts of the screw joints of the pipe joint are periodically tightened to restore the pressure contact force of the gland packing to the hydraulic iron pipe and sleeve, and water from between the connecting ends of two adjacent hydraulic iron pipes is recovered. Maintenance is needed to stop leaks.

Japanese Patent Laid-Open No. 9-229267 JP 2008-175314 A

  By the way, when retightening the bolt and nut of the screw joint of the pipe joint having the above-described configuration, for example, the head of the bolt is fixed with a spanner, a socket wrench, a box wrench, etc. The nut is tightened by hand with a wrench, socket wrench, box wrench, etc., but this tightening work must be performed in an unstable posture on the inclined surface where the conduit is laid. Moreover, it must be performed even in poor environments such as rainy weather. Further, additional tightening work must be performed on the bolts and nuts of the screw fastening body of each pipe joint. Furthermore, if the bolts and nuts of the respective screw fastening bodies are different in size, they must be replaced with a corresponding wrench, socket wrench, box wrench or the like to perform additional tightening work. For this reason, it takes a lot of time and labor to retighten the bolts and nuts of the screw fastening body of the pipe joint, and the burden on the operator is great.

  The present invention has been made in view of the above-described conventional problems, and is capable of easily performing additional tightening work of bolts and nuts of a screw joint of a pipe joint in a short time, and performing additional tightening work. An object of the present invention is to provide a tightening tool that can reduce the burden on the operator.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention is provided at a position facing the first socket mounting portion of the main body, the first socket mounting portion provided on the main body, and the main body, and can be advanced and retracted in the direction of the first socket mounting portion. A tightening screw, a second socket mounting portion provided at the tip of the tightening screw, and a detachable mounting to the first socket mounting portion, and either one of a bolt head or a nut of the screw fastening body And a second socket that can be removably attached to the second socket mounting portion and can be fitted with either the head of the bolt or the nut of the screw fastening body. It is characterized by.

  According to the tightening tool of the present invention, for example, when it is used for maintenance of a pipe joint that connects two adjacent hydraulic pipes constituting a water conduit of a hydroelectric power station in a watertight and expandable manner, the first socket mounting portion The first socket is attached to the second socket, the second socket is attached to the second socket attachment portion, the fastening screw is rotated through the handle, and the fastening screw is moved forward or backward to thereby separate the first socket from the second socket. , Fit either one of the bolt head or nut of the pipe joint screw fastening body to the first socket, and either of the bolt head or nut of the pipe joint screw fastening body to the second socket Fit the other. Then, the pressure of the gland packing of the pipe joint can be adjusted by rotating the handle to advance the tightening screw and tightening the bolt and nut of the screw fastening body. Therefore, the bolt head of the screw fastening body is fixed with a wrench, socket wrench, box wrench, etc., and the troublesome work of tightening the nut of the screw fastening body with a spanner, socket wrench, box wrench, etc. is unnecessary. The tightening operation of the bolt and nut of the screw fastening body can be easily performed in a short time, and the burden on the operator can be greatly reduced.

  In the present invention, the main body may be C-shaped or U-shaped, the first socket mounting portion may be provided at one end of the opening of the main body, and the fastening screw may be provided at the other end. Good.

  Furthermore, in this invention, the said 1st socket and the said 2nd socket are good also as having a socket part which fits the head part or nut of the volt | bolt of the said screw fastening body.

  In the present invention, the first socket mounting portion and the second socket mounting portion are provided with a convex portion or a concave portion, and the first socket and the second socket include the first socket mounting portion and the It is good also as a recessed part or convex part which can be fitted with the convex part or recessed part of a 2nd socket attachment part.

According to the tightening tool of the present invention, the first socket and the second socket corresponding to the size of the bolt and nut of the screw fastening body are used, and the convex portion or concave portion of the first socket mounting portion and the concave portion of the first socket are used. Alternatively, the first socket is attached to the first socket mounting portion by fitting the convex portion with the convex portion or the concave portion of the second socket mounting portion and the concave portion or the convex portion of the second socket. The second socket can be attached to the socket attachment portion.
Therefore, by using the first socket and the second socket according to the size of the bolt and nut of the screw fastening body, it is possible to cope with retightening work of bolts and nuts having different sizes.

  Furthermore, in the present invention, the first socket and the second socket may be configured to be filled with a marking agent.

  According to the tightening tool of the present invention, the marking agent filled in the first socket and the second socket is adhered to the head or nut of the bolt fastening body, thereby further tightening the bolt and nut of the screw fastening body. It can be easily determined whether or not it has been completed.

  As described above, according to the tightening tool of the present invention, for example, a threaded fastener of a pipe joint that connects two adjacent hydraulic pipes constituting a water conduit of a hydroelectric power station in a watertight and expandable manner. When applied to a bolt and nut retightening operation, the bolt and nut retightening operation can be easily performed in a short time, and the burden on the operator can be greatly reduced.

It is the schematic which showed the whole one Embodiment of the clamping tool by this invention. It is explanatory drawing which showed the use condition of the clamping tool of FIG. It is the schematic which showed the 1st socket and the 2nd socket.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of a tightening tool according to the present invention. FIG. 1 is a schematic view of the entire tightening tool, FIG. 2 is an explanatory view showing a use state of the tightening tool of FIG. 1, and FIG. 3 is a schematic view of a first socket and a second socket.

  That is, as shown in FIG. 2, the tightening tool 1 of the present embodiment is, for example, watertight and expandable between two adjacent hydraulic iron pipes 35, 37 of a plurality of hydraulic iron pipes constituting a water conduit of a hydroelectric power station. This is effective for maintenance of the pipe joint 21 to be freely connected.

  As shown in FIG. 2, the pipe joint 21 is provided on the outer peripheral side between the connection ends 36 and 38 of two adjacent hydraulic iron pipes 35 and 37, and one end in the axial direction is connected to one hydraulic iron pipe 35. A cylindrical sleeve 22 integrally fixed to the outer peripheral surface of the end portion 36 by welding, and a stuffing box 24 formed between the inner peripheral surface of the sleeve 22 and the outer peripheral surface of the connecting end portion 38 of the other hydraulic iron pipe 37. A gland packing 27 packed inside and a connecting end portion 38 outer peripheral surface of the other hydraulic iron pipe 37 are provided slidably in the tube axis direction, and the gland packing 27 is attached to the stuffing box at one end portion (tip portion) in the axial direction. A predetermined interval in the circumferential direction is formed between the cylindrical packing presser 25 that presses inwardly of 24, and the other axial end of the sleeve 22 and the other axial end (rear end) of the packing presser 25. Every And a plurality of screw fastener and 30 for forming.

  A flange 23 is formed integrally with the other end in the axial direction of the sleeve 22 so as to project radially outward, and a plurality of screw insertion holes (see FIG. (Not shown) is provided in a penetrating state.

  The other end (rear end) in the axial direction of the packing retainer 25 is integrally provided with a flange 26 projecting annularly outward in the radial direction, and a plurality of flanges 26 are provided at predetermined intervals in the circumferential direction. The screw insertion hole (not shown) is provided in a penetrating state.

  The screw fastening body 30 protrudes from the screw insertion hole of the flange 23 of the sleeve 22 and the bolt 31 that inserts the screw insertion hole of the flange 26 of the packing retainer 25 from the sleeve 22 side, and the screw insertion hole of the flange 26 of the packing retainer 25. It is comprised from the nut 33 screwed by the part of the volt | bolt 31. FIG.

  By tightening the bolt 31 and the nut 33 of the screw fastening body 30, the gland packing 27 can be pressed inward of the stuffing box 24 by the tip end of the packing presser 25, and the inner and outer peripheral surfaces of the gland packing 27 are connected to the other side. The outer peripheral surface of the hydraulic iron pipe 37 and the inner peripheral surface of the sleeve 22 can be pressed.

  As shown in FIGS. 1 and 2, the fastening tool 1 of the present embodiment used for fastening the screw fastening body 30 having the above-described configuration includes a C-shaped body 2 and an opening 3 of the body 2. A first socket mounting portion 4 provided at one end of the main body 2, a cylindrical female screw portion 7 provided opposite to the first socket mounting portion 4 at the other end of the opening 3 of the main body 2, and a female screw portion 7 rotatable. In addition, a round bar-shaped tightening screw 8 screwed so as to be able to advance and retreat in the direction of the first socket mounting portion 4, a second socket mounting portion 12 provided at the tip of the tightening screw 8, and the rear of the tightening screw 8. A handle 10 provided at the end, a first socket 15 detachably attached to the first socket attachment portion 4, and a second socket 18 detachably attached to the second socket attachment portion 12 are provided.

  The first socket mounting portion 4 includes a truncated cone-shaped pedestal portion 5 provided integrally with one end of the opening portion 3 of the main body 2 and the other end of the opening portion 3 provided integrally with the central portion of the upper surface of the pedestal portion 5. The first socket mounting portion is constituted by a prismatic convex portion 6 protruding in the direction, and the convex portion 6 of the first socket mounting portion 4 and a concave portion 17 of the first socket 15 described later are fitted to each other. 4, the first socket 15 is detachably attached.

  The female screw portion 7 has a cylindrical shape in which a female screw (not shown) is screwed on the inner peripheral surface, and the main body is configured such that the axis line coincides with the axis line of the convex portion 6 of the first socket mounting portion 4. 2 is provided integrally with the other end of the opening 3, and a fastening screw 8 is rotatably attached to the female screw of the female screw portion 7 so as to be able to move forward and backward in the direction of the first socket mounting portion 4.

  The second socket mounting portion 12 has a truncated cone-shaped pedestal portion 13 that is integrally provided at the tip of the tightening screw 8 and a direction of the first socket mounting portion 4 that is integrally provided at the center of the upper surface of the pedestal portion 13. The second socket mounting portion is configured by fitting the convex portion 14 of the second socket mounting portion 12 and the concave portion 20 of the second socket 18 described later to each other. A second socket 18 is detachably attached to 12.

  A handle support portion 9 is integrally provided at the rear end portion in the axial direction of the tightening screw 8, and a slide hole (not shown) that penetrates the handle support portion 9 in a direction perpendicular to the axis of the tightening screw 8. The handle 10 is slidably inserted in the slide hole. Stoppers 11 having a diameter larger than that of the slide hole are integrally provided at both ends of the handle 10, and the stopper 10 prevents the handle 10 from dropping from the slide hole.

  As shown in FIG. 3, the first socket 15 has a cylindrical shape, and is provided with a socket portion 16 formed by chamfering an inner peripheral surface in a hexagonal shape on one end side, and an inner periphery on the other end side. A concave portion 17 having a rectangular chamfered surface is provided, and the first socket mounting portion is formed by fitting the concave portion 17 of the first socket 15 and the convex portion 6 of the first socket mounting portion 4 to each other. 4 is detachably attached.

  In addition, the inner peripheral side of the cylindrical first socket 15 is partitioned into one end side and the other end side by a partition wall (not shown), and the inner peripheral surface on one end side is chamfered into a hexagonal shape, and a bottom portion is formed at that portion. May be configured such that a box portion closed by a partition wall is formed, the inner peripheral surface on the other end side is chamfered in a square shape, and a concave portion whose bottom portion is closed by the partition wall is formed in that portion. In this case, the marking agent can be attached to the bolt head or nut of the screw fastening body by filling the inside of the box portion with a marking agent such as paint.

  As shown in FIG. 3, the second socket 18 has a cylindrical shape, and is provided with a socket portion 19 formed by chamfering the inner peripheral surface in a hexagonal shape on one end side, and the inner periphery on the other end side. A concave portion 20 having a chamfered surface is provided. The concave portion 20 of the second socket 18 and the convex portion 14 of the second socket mounting portion 12 are fitted to each other, whereby the second socket mounting portion. 12 is detachably attached.

  A box portion in which the inner peripheral side of the second socket 18 is partitioned into one end side and the other end side by a partition wall, and the inner peripheral surface on one end side is chamfered into a hexagonal shape, and the bottom portion is closed by the partition wall. The inner peripheral surface on the other end side may be chamfered in a quadrangular shape, and a concave portion whose bottom is closed by a partition wall may be formed in that portion. In this case, the marking agent can be attached to the bolt head or nut of the screw fastening body by filling the inside of the box portion with a marking agent such as paint.

  The convex portion 6 of the first socket mounting portion 4 and the convex portion 14 of the second socket mounting portion 12 are formed in the same shape and size, and the concave portion 17 of the first socket 15 and the concave portion 20 of the second socket 18 are formed. The first socket 15 and the second socket 18 may be configured to be attachable to both the first socket attachment portion 4 and the second socket attachment portion 12 by forming the same shape and size.

  And in order to retighten the screw fastening body 30 of the pipe joint 21 with the fastening tool 1 of this Embodiment comprised as mentioned above, as shown in FIG. 2, the head of the bolt 31 of the screw fastening body 30 is shown. A first socket 15 having a socket portion 16 sized to match the portion 32 is prepared, a second socket 18 having a socket portion 19 sized to match the nut 33 is prepared, and the first socket 15 is attached to the body 2. The first socket mounting portion 4 is attached, the second socket 18 is attached to the second socket mounting portion 12, and the tightening screw 8 is rotated via the handle 10 to move the tightening screw 8 forward or backward. The distance between the socket 15 and the second socket 18 is adjusted to the length of the bolt 31 of the screw fastening body 8.

Next, the head portion 32 of the bolt 31 of the screw fastening body 30 is fitted to the socket portion 16 of the first socket 15, the nut 33 is fitted to the socket portion 19 of the second socket 18, and tightened via the handle 10. The bolt 31 and the nut 33 are further tightened by rotating the attached screw 8 forward, the packing retainer 25 is slid on the outer peripheral surface of the hydraulic iron pipe 37, and the gland packing 27 is stuffed at the tip of the packing retainer 25. The inner periphery of the gland packing 27 is pressed against the outer peripheral surface of the hydraulic iron pipe 37 and the outer peripheral surface of the gland packing 27 is pressed against the inner peripheral surface of the sleeve 2.
In addition, you may comprise so that the nut 33 of the screw fastening body 30 may be fitted to the socket part 16 of the 1st socket 15, and the head 32 of the volt | bolt 31 may be fitted to the socket part 19 of the 2nd socket 18. FIG.

  Then, the above-described operation is performed on the bolts 31 and nuts 33 of each screw fastening body 30 of the pipe joint 21, and the bolts 31 and nuts 33 of all the screw fastening bodies 30 of the pipe joint 21 are tightened. Thus, the sealing performance between the ground packing 27 and the outer peripheral surface of the hydraulic iron pipe 27 and the sealing performance between the ground packing 27 and the sleeve 22 can be recovered, and the connecting end portions of the adjacent hydraulic iron pipes 35 and 37 can be recovered. If water leaks between 36 and 38, the water leak can be stopped.

  In the tightening tool 1 of the present embodiment configured as described above, the first socket mounting portion 4 is provided at one end of the opening 3 of the main body 2, and the tightening screw 8 can be moved forward and backward at the other end. The second socket mounting portion 12 is provided at the tip of the tightening screw 8, the first socket 15 is detachably mounted on the first socket mounting portion 4, and the second socket 18 is detachably mounted on the second socket mounting portion 12. Attach the head 32 of the bolt 31 of the screw fastening body 30 to the first socket 15, fit the nut 33 of the screw fastening body 30 to the second socket 18, and tighten the fastening screw 8 via the handle 10. Since the bolt 31 and the nut 33 of the screw fastening body 30 are tightened by rotating, the bolt 31 of the screw fastening body 30 is fixed with a spanner, a socket wrench, a box wrench, etc. with one hand as in the prior art. While, spanner, socket wrench, a complicated work such as tightening the nut 33 of the screw fastener 30 by box wrench is not required with the other hand.

  In other words, the bolts 31 and the nuts 33 of the screw fastening bodies 30 of the pipe joints 21 that connect the two adjacent hydraulic iron pipes 35 and 37 in a watertight and telescopic manner can be easily and quickly performed. This can greatly reduce the burden on the operator.

  Although not shown, when the first socket 15 and the second socket 18 are of a type having a box portion whose bottom is closed, the inside of the box portion is filled with a marking agent. Thus, the marking agent can be attached to the head 32 and the nut 33 of the bolt 31 of the screw fastening body 30 that has been tightened, and management of whether or not the tightening has been completed is facilitated.

  Further, in the above description, the present invention is used to retighten the screw fastening body 30 of the pipe joint 21 that connects between the connection ends 36 and 38 of two adjacent hydraulic iron pipes 35 and 37 that constitute the water conduit of the hydroelectric power plant. Although the invention has been applied, the present invention may be applied to connection of various other tubular members, not limited to the hydraulic iron pipes in the water conduits of hydroelectric power plants, and in this case, the same effects can be obtained. .

  Further, in the above description, the first socket mounting portion 4 is provided with the convex portion 6, the first socket 15 is provided with the concave portion 17, and the first socket mounting portion 4 has the convex portion 6 and the first socket 15 has the concave portion 17. The first socket mounting portion 4 is provided with a recess, the first socket 15 is provided with a projection, and the recess of the first socket mounting portion 4 and the projection of the first socket 15 are fitted. You may comprise.

  Further, in the above description, the convex portion 14 is provided in the second socket mounting portion 12, the concave portion 20 is provided in the second socket 18, and the convex portion 14 of the second socket mounting portion 12 and the concave portion 20 of the second socket 18 are However, the second socket mounting portion 12 is provided with a concave portion, the second socket 18 is provided with a convex portion, and the concave portion of the second socket mounting portion 12 and the convex portion of the second socket 18 are fitted. You may comprise.

DESCRIPTION OF SYMBOLS 1 Tightening tool 2 Main body 3 Opening part 4 1st socket attachment part 5 Base part 6 Convex part 7 Female thread part 8 Fastening screw 9 Handle support part 10 Handle 11 Stopper part 12 Second socket attachment part 13 Base part 14 Convex part 15 First socket 16 Socket portion 17 Recess 18 Second socket 19 Socket 20 Recess 21 Fitting 22 Sleeve 23 Flange 24 Staffing box 25 Packing retainer 26 Flange 27 Gland packing 30 Screw fastening body 31 Bolt 32 Head 33 Nut 35 One side Hydraulic iron pipe 36 Connection end 37 Other hydraulic iron pipe 38 Connection end

Claims (5)

  A main body, a first socket mounting portion provided on the main body, a fastening screw provided at a position facing the first socket mounting portion of the main body and capable of moving forward and backward in the direction of the first socket mounting portion; A second socket mounting portion provided at the tip of the tightening screw and a second socket mounting portion detachably mounted to the first socket mounting portion, and can be fitted with either a bolt head or a nut of the screw fastening body. 1 socket and the 2nd socket which can be detachably attached to the 2nd socket attachment part, and can fit either the head of a bolt of the screw conclusion object, or a nut. Tightening tool to do.   2. The body according to claim 1, wherein the body is C-shaped or U-shaped, the first socket mounting portion is provided at one end of the opening of the body, and the fastening screw is provided at the other end. The described tightening tool.   The tightening tool according to claim 1, wherein the first socket and the second socket have a socket portion into which a head portion or a nut of a bolt of the screw fastening body is fitted.   The first socket mounting portion and the second socket mounting portion are provided with a convex portion or a concave portion, and the first socket and the second socket include the first socket mounting portion and the second socket mounting portion. The tightening tool according to any one of claims 1 to 3, further comprising a concave portion or a convex portion that can be fitted to the convex portion or the concave portion.   The fastening tool according to any one of claims 1 to 4, wherein the first socket and the second socket are configured to be filled with a marking agent.

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