JPS6031500A - Hydraulic jack for tension - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tensioning hydraulic jack, and in particular, a movable pressing body is installed, a pressing elastic body is provided to urge the pressing body J in the pressing direction, and the 5.2 The required number of pressing elastic bodies is such that the pressing body individually and simultaneously presses each of the plurality of tensioning wedges into each through hole of the tensioning body. b) On the other hand, the biasing force applied to each tension wedge is made uniform.

As a conventional tensioning hydraulic jack, for example, the
There is one described in Japanese Patent No. 21783. this is,
As a means for pressing and biasing the plurality of mold pieces constituting each of the plurality of tensioning bodies into the through holes of the tensioning body, each wedge piece is individually provided with a spring, and the springs are used to force the first force mentioned above. That's what I do.

However, in such a conventional tensioning hydraulic jack, the number of springs that press the wedge pieces into the through holes of the tensioning body is enormous (for example, the number of tensioning wedges is 12 tl?i).
l, and each tensioning wedge is +1 from three 4311J11
If the number of mold pieces is 1'1, the total number of mold pieces is 3.
Since there are 6 pieces, the number of the above-mentioned wings also becomes 36 pieces. ) Furthermore, since it becomes difficult to make the elasticity of each spring uniform, variations tend to occur in the force with which each wedge piece is pressed against the through hole of the tension body. For this reason, if the force with which each tensioning wedge engages with the tensioning body becomes uneven, the force that fixes the tensioning wedge to the tensioning body becomes uneven. There is a problem that variations occur in the tension force applied to the body, and as a result, the tension force of the strips tensioned by the tensioning hydraulic jack becomes uneven.

This invention was made to solve the problems of the conventional example, and its purpose is to reduce the number of springs that press the wedge pieces into the through holes of the tension body.
The purpose is to equalize the force with which each mold piece is pressed into the through hole of the tensioning body, and to equalize the tensioning force of each tensioning strip tensioned by the tensioning hydraulic jack.

Therefore, the configuration of the invention according to this application will be described below with reference to the reference numerals of the drawings showing the embodiments.

That is, the specific invention is a tensioning hydraulic jack characterized by having each of the following members A to G.

A A plurality of bases including a plurality of through holes 2 through which a plurality of tensioning strips 1 pass individually, and fixing wedges 3 that are engaged in the through holes 2 and fixing the tensioning strips 1. tension strip 1
The base 4 is provided with a plurality of through holes 5 that pass through the base 4 individually.
A seated body 6 3 is provided with a plurality of through holes 7 through which a plurality of tensioning strips 1 pass individually, and a tensioning member that moves in a direction away from the seating body 6 to apply tension to the tensioning strip 1. Body 8 D A tensioning sleeve 9 that is arranged in the through hole 7 of the tensioning body 8 and on the outer surface of the tensioning strip 1 to engage and fix the tensioning strip 1 to the tensioning body 8 E The tensioning body Hydraulic pressure actuation device 10 connected to the tensioning body 8 for moving the tensioning body 8 7 A movable pressing body 11 G for pressing the tensioning member 9 into each through hole 7 of the tensioning body 8 G Pressing body Pressing elastic body 12 that urges 11 in the pressing direction A tensioning hydraulic jack characterized by comprising each of the following members A to H is a combined invention of the specific invention.

A A plurality of bases including a plurality of through holes 2 through which a plurality of tensioning strips 1 pass individually, and fixing tools 3 that are engaged in the through holes 2 and fixing the tensioning strips 1. tension strip 1
The base 4 has a plurality of through holes 5 that pass through the base 4 individually.
A plurality of through holes 7 through which the plurality of tensioning strips 1 pass individually
A tension body 8 D which moves in a direction away from the seated body 6 to apply tension to the tension strip 1 D A plurality of divided wedge pieces 9a are assembled, and the plurality of wedge pieces 9a are: A tensioning wedge 9E is disposed in the through hole 7 of the tensioning body 8 and engages with the outer periphery of the tensioning strip 1 to fix the tensioning strip 1 to the tensioning body 8. A tensioning wedge 9E moves the tensioning body 8. A hydraulic actuating device 10 F connected to the tensioning body 8 for the purpose of pressing the tensioning wedge 9 into each through hole 7 of the tensioning body 8. A pressing elastic body 12H that urges the tensioning member 12 Next, the present invention will be explained according to the illustrated embodiments.

FIG. 1 is a sectional view of a tensioning hydraulic jack, which tensions the tensioning strip 1 and applies stress to, for example, a concrete molded body 14.

Reference numeral 4 denotes a base, which is seated on a concrete molded body 14 and has a through hole 2 through which the tension strip 1 passes. The through hole 2 has a tapered outer end portion that widens outward, and a fixing member 3 disposed on the outer periphery of the tension strip 1 engages therein.

A seated body 6 is seated on the base 4. The seating body 6 is made of a thick circular plate, and a recess 15 is formed in the surface on the base 4 side, and a retainer plate 16 is attached to the recess 15 to form a gap between the retainer plate 16 and the base 4. Set to value. Further, the seating body 6 has a through hole 5 through which the tensioning strip 1 passes.
, and further retainer plate 1 in seating body 6.
A reset pipe 17 is provided to protrude from the surface opposite to the through hole 5 concentrically with the through hole 5, and is fixed with a cover plate 18. The tip of the recessor L-vibrator 17 is tapered so that the end face faces outward.

A tension body 8 is arranged opposite to the seated body 6. The tensioning body 8 is made of a thick circular plate, and a through hole 7 through which the tensioning strip 1 passes is formed. The through hole 7 is formed with a taper that widens outward at both ends, and the taper on the seating material 6 side is such that the tip of the reset pipe 17 can be easily inserted into the hole hole 53, and the taper on the opposite side The taper is 9 for tension.
There is a toothpick for engagement.

The tension pattern 9 is formed by concentrically gathering three divided wedge pieces 9a as shown in FIG.
a is disposed on the outer periphery of the tensioning strip 1 in the through hole 7 of the tensioning body 8 and engages with the tensioning strip 1 to fix the tensioning strip 1 to the tensioning body 8.

This wedge piece 9a is supported by a pressing body 11 via a support rod 11a that is protruded from the wedge piece 9a, and is supported by a pressing elastic body 12 that is connected to this pressing body 11 as will be described later.
As a result, the through hole 7 is pressed inward. Also, 3
Two wedge pieces 9a, a rubber band 19 wrapped around the outer periphery of these pieces
As a result, the tensioning wedge 9, which is an assembly of these, is formed into a cylindrical shape, while the expanding elastic body 13 urges the portion on the pressing body 11 side to expand. The elastic body 13 for expanding the rod consists of a C-shaped ring-shaped spring.
'It is disposed inside the support rod 11a protruding from each cut piece 9a, and by urging the support rod 11a away from the tensioning strip l, the tensioning wedge 9 is expanded. be. Furthermore, the tip of the wedge piece 9a is connected to the resent pipe 1.
The tensioning wedge 9 has a shape corresponding to the tip shape of the tensioning wedge 7, and thus the tip of the tensioning wedge 9 tapers inward.

The seating body 6 and the tension body 8 are coupled to a hydraulically actuated device 10. The hydraulic actuator 10 includes a cylinder 23 which is composed of an inner cylinder 20 and an outer cylinder 21 outside the inner cylinder 20, and in which a cylindrical hydraulic chamber 22 is formed between the double cylinders 20 and 21; The piston rod 25 includes a piston 24 housed in the hydraulic pressure chamber 22, and a cylindrical piston rod 25 whose one end is fixed to the piston 24 and whose outer end extends outside the hydraulic pressure chamber 22. The seated body 6 is attached to the outer end of the cylindrical piston rod 25 by a bolt 26.
while fixing the inner cylinder 20 forming the cylinder 23.
The tensioning body 8 is fixed by screwing to an inner ring close to the seating body 6, and the seating body 6 and the tensioning body 8 are configured to be movable relative to each other in the axial direction of the cylinder 23. 27 is a packing, 28 is a dust seal, and 29 is an O-ring.

A cylindrical body 30 is fitted inside the inner cylinder 20, and a guide shaft 31 whose one end is fixed to the tension body 8 is passed through flanges 30a and 30b of the cylindrical body 30.
The cylindrical body 3o can move forward and backward along the guide shaft 31. The free end of the guide sock 1-31 is male, and a nut 32 is screwed into it. A pressing elastic body 12 is fitted onto the guide shaft 31 between the flange 30a of the cylindrical body 30 and the nut 32.

The pressing elastic body 12 is made of a compression coil spring. Further, a handle 33 is fixed to the flange 30a of the cylindrical body 3o. In addition, although the guide shaft 31 is illustrated as 1D,
A total of three pieces are installed along the flange 30a.

A guide member 34 is fixed to the seating body 6, and the outer cylinder 21
A shoe 35 that moves along a guide member 34 is fixed to the outside of the shoe 35 . A scale for measuring the amount of movement between the seated body 6 and the tension body 8 is displayed on the guide portion 34. Outer cylinder 2
1 is provided with hydraulic ports 36 and 37 that communicate with both sides of the piston 24 of the hydraulic chamber 22.

Although a plurality of tensioning strips 1 are used, only one tensioning strip 1 is shown in FIG. It goes without saying that the other tensioning strips are arranged in the same manner as the tensioning strip 1 shown in the figure.

Next, the effect will be explained.

The tensioning strip 1 protruding from the concrete molded body 14 is passed through the through hole 2 of the base 4, and the fixing wedge 3 is engaged with the tapered portion of the through hole 2. 1
Fix it to the base 4.

Here, the hydraulic actuating device 10 of the tensioning hydraulic jack and the seating body 6 and tensioning body 8, which are held at a predetermined distance from each other by this, are set on the tensioning strip 1.

This tensioning is performed by passing the tensioning strip 1 into the through hole 5 of the seating body 6 and the through hole 7 of the tensioning body 8. The seating body 6 and the tensioning body 8 are positioned relative to each other in the position shown in FIG. ing. In this state, since the tip of the tensioning pattern 9 is pressed against the tip of the reset pipe 17 by the pressing elastic body 12 via the pressing body 11, the tip of the tensioning pattern 9 is widened due to the taper of the image tip. In addition, the tensioning sheet j9 is expanded by the expansion elastic body 13.
The rear end is also widened. For this reason, since the entire tensioning PJ 9 is spread out, even when the tensioning strip 1 is inserted into the tensioning wedge 9, the tip of the tensioning strip 1 is inserted into the tensioning wedge 9.
The tensioning hydraulic jack can be adjusted smoothly without hitting the inner surface. This set state is shown in FIG. 1, and FIG. 4 shows the relationship between the tensioning wedge 9 and the tensioning strip 1 at this time.

Next, tension is applied to the tensioning strip 1. This is hydraulic port 3
7, hydraulic pressure is applied in the hydraulic pressure chamber 22, and the cylindrical histone rond 25 is rotated each time it is extended.Then, the seated body 6 at the outer end of the cylindrical piston rod 25 is placed in a state seated on the base 4. Therefore, the cylinder 23 moves in the opposite direction to the direction in which the cylindrical piston rod 25 extends.
starts moving together with the cylinder 23. Then, the tensioning pipe 9 is pressed against the tapered surface of the through hole 7 of the tensioning body 8,
As a result, each wedge piece 9a is pushed inward against the urging force of the expansion elastic body 13, and each wedge piece 9a comes into pressure contact with the tensioning strip 1, thereby tensioning the tensioning wedge 9 engaging portion of the tensioning strip 1. Move it together with the body 8. This is the state shown in FIG.

When the tensioning strip 1 is tensioned and moved, the fixing mold 3 is pulled out from the tapered portion of the through hole 2, freeing the relationship between the tensioning strip 1 and the base 4. At this time, the fixed P! !
3 has a through hole 2 due to the presence of the retainer plate 16.
For fixing without completely coming off from &! ! 3 is slightly protruding from the through hole 2, and the inner surface of the fixing utility 3 is in sliding contact with the tension strip 1. This is the state shown in FIG.

At the beginning of the movement of the tensioning strip 1, the tip of the tensioning wedge 9 separates from the tip of the cent vibrator 17, so the tensioning wedge 9
Since there is no cause for expansion of the tension member 9, the tension member 9 can be sufficiently pressed against the tension member 1. Due to the movement of the tensioning wedge 9 engaging portion of the tensioning strip 1, tension force is applied to the tensioning strip 1. FIG. 6 shows the state in which the tensioning strip 1 is being tensioned.

This tensioning is performed while monitoring the amount of movement of the shoe 35 with respect to the guide member 34. The degree of tension can be visually confirmed by the position of the shoe 35.

Further, the engagement between the guide member 34 and the shoe 35 can prevent relative rotation between the cylinder 23 and the cylindrical piston rod 25 and between the tension body 8 and the seated body 6.

Then, when a certain tension force has been applied to the tensioning strip 1, the hydraulic pressure applied to the hydraulic pressure chamber 22 through the hydraulic pressure port is slightly reduced. As a result, the tensioning strip 1 that had been tightened returns slightly, and along with this, the fixing tool 3 that was in sliding contact with the tensioning strip 1 is moved to the tapered portion of the through hole 2 of the base 4. is pulled back, and the tensioning strip 1 is wedged to the base 4 as before the tensioning starts. This is the state shown in FIG.

Next, when hydraulic pressure is supplied to the hydraulic pressure chamber 22 through the hydraulic pressure port 36, the cylindrical piston rod 25 is thereby reduced. At this time, the seated body 6 moves in a direction away from the base 4 and closer to the tension body 8. The reason why the seated body 6 moves is because of tension P!
! This is because the tensioning body 8 is fixed to the tensioning strip 1 by the tensioning member 9. When the seated body 6 approaches the tensioning body 8 in this manner, the tip of the reset pipe 17 enters the through hole 7 of the tensioning body 8 and comes into contact with the tip of the tensioning wedge 9. And the reset vibe 17 tip is for tension 8! ! In order to press the tip of the tensioning tool 9, the tensioning tool 9 is pulled out from the tensioning body 8 while being expanded from the tapered surface at the tip of the image. Therefore, the tension body 8 is the tension body 8.
It comes out slightly from the through hole 7, and the tip is expanded by the reset vibe 17, and the four rear ends are expanded by the expansion elastic body 13, and are released from being held against the tensioning strip 1. be done.

Thus, the engagement between the tensioning body 8 and the tensioning strip 1 is released.

This completes the -th tensioning operation, but by repeating this, the tensioning strip 1 can be further tightened. When the tensioning block 9 is pulled out from the through hole 7 of the tensioning body 8, by pulling the handle 33, the pressing body 11 is moved through the cylindrical body 30 against the pressing elastic body 12. The tension utility 9 can also be extracted from the through hole 7. Note that in this embodiment, cylinder 2
3 is composed of an inner cylinder 20 and an outer cylinder 21 to form a double structure, a hydraulic pressure chamber 22 is formed between these, and a cylindrical piston rod 25 is inserted into the hydraulic pressure chamber 22, thereby constructing the hydraulic actuator 10. did. For this reason, the overlapping distance between the cylinder 23 and the cylindrical piston rod 25 is long, so the relative movement stroke between the cylinder 23 and the cylindrical piston rod 25 becomes large compared to the length of the cylinder 23. result,
Tensioning force c+ compared to the entire length of the tensioning hydraulic jack
This has the effect of increasing the length. , 2 As explained above, according to the present invention, a movable pressing body for pressing the tensioning member into each through hole of the tensioning body is installed,
A pressing elastic body is provided that forces the pressing body in the pressing direction, and the pressing elastic body individually and simultaneously applies each of the plurality of tensioning functions to each through hole of the tensioning body. I tried to put pressure on him. Therefore, the number of pressing elastic bodies required can be reduced, and the force for pressing each wedge piece into the through hole of the tensioning body can be made uniform, so that each wedge tensioned by the tensioning hydraulic jack can be This has the effect of making the tension of the tensioning striations uniform.

In addition, since the tension utility is provided with an expanding elastic body to expand it, when the tension utility is not loaded with tension force from the tension body, the center space of the tension utility expands. There is. Therefore, when the tensioning hydraulic jack is inserted into the tensioning strip, the work of inserting the tensioning strip into the tensioning utility can be carried out smoothly.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the invention, and FIG. 2 is a sectional view showing an embodiment of the invention.
A rear end view of the tension utility; FIG. 3 is a sectional view taken along line X-X in FIG. 2; FIG. 4 is an enlarged sectional view of the tension utility in FIG. 1;
Fig. 5 is an enlarged sectional view showing the state of the tensioning tool immediately after tensioning, Fig. 6 is an enlarged sectional view showing the state of the tensioning mock during tensioning, and Fig. 7 is an enlarged sectional view showing the state of the tensioning workpiece during tensioning. FIG. 8 is an enlarged sectional view showing the state of the fixing wedge after the tension is completed. ...Base, 5...Through hole, 6...Seating body,
7... Through hole, 8... Tension body, 9... Tension model,
9a...Wedge piece, 10...Hydraulic pressure actuation device, 11...
Pressing body, 12... Elastic body for pressing, 13... Elastic body for expansion, 14... Concrete molded body, 15... Recess, 16... Retainer plate, 17... Resent pipe , 18... cover plate, 19... rubber band,
20... Inner cylinder, 21... Outer cylinder, 22... Hydraulic pressure chamber,
23...Cylinder, 24...Piston, 25...
Tubular Piston Rond Patent Applicant Taisei Corporation Representative Patent Attorney Tetsuya Mori Representative Patent Attorney Yoshiaki Naito Representative Patent Attorney l? f water pressure agent patent attorney digging out the water to the ward 1-, , (,)

Claims (3)

[Claims] (1) A tensioning hydraulic jack characterized by comprising each of the following members A to G. A A base comprising a plurality of through holes through which a plurality of tensioning strips pass individually, and a fixing wedge that is engaged in the through holes and fixing the tensioning strips.B A base with a plurality of tensioning stripes A seated body C that is provided with a plurality of through holes that pass through the seat individually and is seated on the base; A tension body D that applies tension to the tension body G; A tension wedge E that is disposed in the through hole of the tension body and on the outer surface of the tension body and engages to fix the tension body G to the tension body G; A hydraulic actuation device F connected to the tensioning body for moving the tensioning body; A movable pressing body G for pressing the tensioning wedge into each through hole of the tensioning body; Elastic body for pressing (2) A cylinder consisting of an inner cylinder and an outer cylinder outside the same and forming a cylindrical hydraulic pressure chamber between the double cylinders, a piston housed in the hydraulic pressure chamber, and one end of the piston. a cylindrical piston rod that is fixed and whose outer end extends outside the hydraulic pressure chamber;
configuring the hydraulic actuator, the seating body is fixed to the outer end of the cylindrical piston rod, and the tensioning body is fixed to the inner end of the inner cylinder forming the cylinder near the seating body, Claim 1, wherein the seated body and the tension body are configured to be relatively movable in the axial direction of the cylinder.
Hydraulic jack for tension as described in section. (3) A tensioning hydraulic jaw characterized by comprising each of the following members A-H. A: A base comprising a plurality of through holes through which a plurality of tensioning strips pass individually, and a fixing member that is engaged in the through holes and fixing the tensioning strips.B: A plurality of tensioning strips. A seated body C that is provided with a plurality of through holes through which the body passes individually and is seated on the base;C that is provided with a plurality of through holes through which a plurality of tensioning stripes pass individually, and that moves in a direction away from the seated body; A tensioning body D that applies tension to the tensioning strip by applying tension to the tensioning strip.The tensioning body D is made up of a plurality of divided wedge pieces, and the plurality of wedge pieces are arranged in the through hole of the tensioning body and around the outer periphery of the tensioning strip. a tensioning wedge E that engages and fixes the tensioning body to the tensioning body; a hydraulic actuator F connected to the tensioning body for moving said tensioning body; a hydraulic actuator F connected to said tensioning body for moving said tensioning body; A movable pressing body G for pressing into the hole; A pressing elastic body (2) that urges the pressing body in the pressing direction (engages with a plurality of wedge pieces constituting the tensioning wedge to expand the tensioning wedge); Expansion elastic body that urges each wedge piece outward from the tension strip to open it.