JPH0416850Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a method for producing prestressed concrete members or structures, etc. by tightening screws that are connected to the ends of the prestressed steel material after the prestressed steel material is tensed. This relates to a prestressing steel material tension fixing device for applying prestress to the concrete member, etc. by tightening a nut screwed into the part.

(Conventional technology) Conventional PC steel tension fixing devices are, for example,
60-00261, and as shown in FIG.
By pulling with the center hole jack J, transmitting torque to the box spanner B by the rotary drive part Q including the gear G and the turning rod R, and rotating and tightening the nut N screwed into the threaded part S.
This was to fix the PC steel material under tension. This device integrates a tensioning section consisting of a bearing plate U, a number of tension rods T, one jack J, and a tensioning flange F, and a fixing nut fixing mechanism consisting of a box spanner B and a rotation drive section Q. It consisted of

(Problems to be solved by the invention) In the case of the above-mentioned conventional PC steel material tension fixing device, the center hole jack J etc. and the rotational drive part Q are integrated, so the entire device becomes large and the PC steel material P It requires a space to place the equipment itself outside of the equipment, making it difficult to work in a narrow space, and if the standard dimensions or number of prestressing steel P are changed, the entire equipment needs to be changed accordingly. Furthermore, as the prestressing steel material P is being tensioned, the positional relationship between the nut N and the rotary drive unit Q changes, so it is inconvenient that it is necessary to tension the prestressing steel material P and rotate the nut N at the same time. There was a problem with this.

In view of the problems with the conventional methods mentioned above, the present invention allows work to be carried out easily even in narrow spaces.
Even if the standard dimensions and number of prestressed steel P are changed, it can be handled by changing only part of the equipment, and tensioning of the prestressed steel P and rotation of the nut can be performed separately.
The purpose is to provide a PC steel tension anchoring device.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a tension fixing method for tightening a PC steel material by applying tension to a prestressed steel material having a threaded portion connected to each end thereof and tightening a nut screwed into the threaded portion. The device includes a common tension rod connected to each of the plurality of prestressing steel materials via the threaded portion, and a center hole jack having a jack air, through which the common tension rod is attached and which pulls the common tension rod. and a rotating body having a gear on its outer periphery and engaging each of the nuts, and a rotational drive unit having a pinion corresponding to each of the nuts and meshing with the gear and being transmitted via a flexible shaft, The rotational drive unit and the rotating body are supported by a rotational drive unit casing separated from the jack air, and are housed in the jack air so that they can be freely inserted and removed.

(Function) According to the present invention, a common tension rod is connected to each end of a plurality of prestressing steel materials through threaded portions, and the common tension rod is passed through a center hole jack provided with a jack air. A rotary drive unit that is pulled by a center hole jack and has gears on its outer periphery and engages with each of the nuts, and a rotary drive unit that has a pinion that meshes with the gears is supported by a rotary drive unit casing separated from the jack air. The plurality of prestressing steel members are housed in a jack kite in a freely insertable and removable manner, and are individually rotated and tightened by the rotary drive unit transmitted through the flexible shaft, which is screwed into each of the threaded parts. At the same time, it can make you tense and settle.

(Example) An example of the present invention will be described with reference to the drawings.

FIG. 1 shows the entire PC steel material tension fixing device according to an embodiment of the present invention, and shows A--A in FIG.
A sectional view (only the rotary drive portion is shown in a different position), and FIG. 2 is a BB sectional view of FIG. 1.

The bearing plate 2 is in contact with the end of the concrete product 1.
are provided, and each screw portion 3 crimped to each end of three prestressed steel materials (not shown) arranged in parallel and equiangularly spaced on the same circular arc with their cross-sectional centers is connected to the through hole 2a of the bearing pressure plate 2. is inserted into. Threaded part 3
has a stepped portion 3a at the tip and a small diameter portion 3b,
Male threads 3c and 3d are carved on the outer periphery. A fixing nut 4 is screwed into the large diameter portion, and a tension rod 5 is connected to the small diameter portion 3b.

The fixing nut 4 has a concentric annular convex portion 4 on the tip surface.
a is formed, and four key grooves 4b are provided at equal angular intervals in the convex portion 4a.

The PC steel tension fixing device includes three tension rods 5 connected to each threaded portion 3, a common tension rod 7 connected to each tension rod 5 via an adapter 6, and a center for tensioning the common tension rod 7. It is provided with a hole jack 8, a rotation drive section 9 for rotating the fixing nut 4 screwed onto the threaded section 3, and the like.

One end of the tension rod 5 is connected to the threaded portion 3 through a threaded hole 5a that is threaded into the male thread 3d of the small diameter portion 3b of the threaded portion 3, and this connection portion includes:
As will be described later, a rotating body 10 having a spur gear 10a is integrated with the fixing nut 4 and is rotatably attached thereto. The other end of the tension rod 5 is loosely inserted into each through hole 6e of a disc-shaped adapter plate 6c, and the stepped part 5c abuts the adapter plate 6c, and a nut 5d is screwed into the male thread 5b at the tip. It is integrated with the adapter plate 6c by.

The adapter 6 has screw holes 6a and 6b of different sizes at both ends, and an adapter plate 6c has a male screw 6d provided on the outer periphery of the screw hole 6a at one end.
are screwed together and inserted.

The common tension rod 7 passes through the center hole 8a of the center hole jack 8, and one end of the common tension rod 7 is inserted into the screw hole 6 of the adapter 6 with a male thread 7a provided at its tip.
b, and is connected to the tension rod 5 via the adapter 6. A male screw 7b is provided at the other end, and a stop plate 7c is attached to the tip.

Center hole jack 8 is cylinder 11
It is composed of a ram 12 etc. that is slidably fitted into the cylinder 11 and has a center hole 8a, and is operated by sending pressurized oil or water between the cylinder 11 and the ram 12. be.

A cylindrical jack 13 is connected to the tip of the cylinder 11 with a bolt 14, and the jack 13 is provided with an opening 13a through which the rotation drive section 9 faces.

A head cap 12a and a cylindrical piece 12b are attached to the end of the ram 12 on the side of the cylinder head 11a, and a nut 12c abuts on the cylindrical piece 12b.
is connected to the common tension rod 7 by screwing it into the external thread 7b of the common tension rod 7.

FIG. 3 shows one tension rod 5 and the corresponding rotary drive unit 9, and is a sectional view taken along the line C-C in FIG. Although the arrangement corresponding to the five prestressing steel members is shown by two-dot chain lines, the relative relationship between the set of tension rods 5 and the rotation drive unit 9 is the same as in the case where there are three prestressing steel members.

The rotating body 10 has a spur gear 10a formed with teeth carved only on the outer periphery near the threaded portion 3, and thrust bearings 10b, 10b and bushes 10c, 10c are provided on both ends of the outer periphery of the toothless portion. One thrust bearing 10b is fixed by a circlip 10d, and has an annular groove 10e corresponding to the annular protrusion 4a of the fixing nut 4.
A key 10f, which is fitted into the key groove 4b of the nut 4, is fixed at this location by a bolt 10g.

The rotating body 10 has a center hole in which the end of the tension rod loosely fits, and a through bolt 1 that is screwed into a screw hole 4c provided in the end surface of the fixing nut 4.
It is connected to the fixing nut 4 by 0h.

The rotary drive unit 9 is configured to transmit power via a flexible shaft 15 whose one end is connected to a driving shaft of an external motor (not shown), and includes a harmonic drive component 16 for deceleration and a drive shaft of the rotating body 10. The harmonic drive component 16 and the rotary body 10 are supported by separate rotary drive unit casings 9a separated from the gear 13, and the rotary body 10 is composed of a pinion 17 etc. that meshes with the spur gear 10a and is keyed to the output shaft 16d. It is integrally connected to the fixing nut 4 via the fixing nut 4, and is housed in the jack air 13 so as to be freely insertable and removable.

The harmonic drive component 16 includes an elliptical plate 16c fixed to the input shaft 16a by a key 16b, and a flex spline 16e made of an elastic material, connected circularly to the output shaft 16d, and having teeth carved on the outer periphery. , and a fixed gear 16f having internal teeth that mesh with the teeth of the flexspline 16e. In the harmonic drive component 16, the rotational force of the flexible shaft 15 is input to the input shaft 16a through the coupling 18, and the ellipsoidal plate 16c rotates so that the outer periphery of its long axis comes into contact with the inner surface of the flexspline 16e. The teeth of the flex spline 16e are fixed to the gear 16f.
It meshes with the teeth of the input shaft 16a and the output shaft 16d to give deceleration rotation to the output shaft 16d.
are supported by ball bearings 16h, 16h and 16g, 16g, respectively.

The rotation drive unit 9 has three tension rods 5 each.
and a second bolt corresponding to each fixing nut 4 of each screw portion 3 to which the tension rod 5 is connected.
As shown in the figure, they are arranged at equal angular intervals and are housed in an orderly manner within the tip of the jacket air 13.

Next, an example of an assembly method and operation of the PC steel tension fixing device according to the above embodiment of the present invention will be explained.

A rotating body 10 is connected to a fixing nut 4 and surrounded by a fixing ring 19 to integrate three sets of rotation drive parts 9, and each tension rod 5 is screwed to the tip of each of the three threaded parts 3. Insert the tip of each tension rod 5 into each through hole 6e of the adapter plate 6c, screw each nut 5c onto each tension rod 5 to attach the adapter plate 6c, and then connect the common tension rod 7 via the adapter 6. . After that, insert the common tension rod 7 into the jack kit air 13 and the center hole jack 8, bring the tip of the jack kit air 13 into contact with the bearing pressure plate 2, and insert a nut into the tip of the common tension rod 7 protruding from the ram 12 of the center hole jack 8. 12c, and then attach the stop plate 7c. In this state, as shown in FIG. 1, by supplying pressure oil to the pressure oil chamber on the left side of the ram 12, moving the ram 12 to the right, and pulling the common tension rod 7 with the center hole jack 8, the adapters 6 and 3 Three tension rods (not shown) are connected through the tension rod 5 of the book.
The PC steel material is simultaneously tensioned to give it elongation within its elastic limit, and the fixing nut 4 is turned by the rotation drive unit 9 transmitted through the flexible shaft 15 and tightened in accordance with the elongation, thereby fixing the PC steel material. After that, remove the nut 12c, send pressure oil to the pressure oil chamber on the right side, move the ram to the left, and remove the PC steel tension fixing device in the reverse order of the above assembly to prepare for next use.

Note that the number of PC steel materials that can be pulled at the same time by one center hole jack 8 is not limited to three, but may be two or four or more; for example, five PC steel materials can be pulled at the same time. In this case, as shown in Fig. 4, the centers of five PC steel materials are set at the same circumference of 20
Connect the threaded part, tension rod, and common tension rod to each PC steel member in the same manner as described above, and rotate each nut individually in accordance with the nut to be screwed into each threaded part. Five rotary drive units 9 may be arranged on the same circumference 21 outside the circumference 20 at equal angular intervals.

(Effects of the invention) The present invention is constructed as described above, and a center hole jack is constructed in which a common tension rod is connected to a plurality of prestressing steel materials through threaded portions, and the common tension rod is passed through the center hole to provide a center hole jack. By attaching it to the center hole jack and pulling the common tension rod with the center hole jack, it is possible to simultaneously pull multiple PC steel materials with one center hole jack and one common tension rod. By individually rotating each nut with the rotary drive section that is connected to each nut to be fitted and transmitted through the respective flexible shaft corresponding to each nut, the device itself can be easily miniaturized and large. It does not require any space and can handle tensioning work of prestressed steel materials arranged at narrow intervals in a narrow space.Each rotary drive unit is supported by its own rotary drive unit casing, and each By engaging with the nut and being separated from the jack air and stored in a freely insertable and removable manner, even if the standard dimensions and number of prestressing steel materials are changed, it is possible to simply replace the rotary drive unit or increase or decrease the number of rotary drive units, etc. There is no need to change the entire device, and since the rotation drive part and the nut are displaced as a unit as the prestressing steel material is tensioned, there is no need to perform tensioning of the prestressing steel material and rotation of the nut at the same time. have an effect.

[Brief explanation of the drawing]

Fig. 1 shows the entire PC steel material tension fixing device according to an embodiment of the present invention, and shows A-A in Fig. 2.
A sectional view (however, only the rotary drive part is shown in a different position), Figure 2 is a BB sectional view of Figure 1,
3 is a sectional view taken along the line CC in FIG. 4, FIG. 4 is a view taken along the line DD in FIG. 3, and FIG. 5 is a side view showing an example of a conventional prestressing steel material tension fixing device. 1... Concrete product, 2... Bearing plate, 2a
...through hole, 3...threaded part, 3a...stepped part, 3b
...Small diameter portion, 3c, 3d...Male thread, 4...Fixing nut, 4a...Protrusion, 4b...Keyway, 4c
...Screw hole, 5...Tension rod, 5a...
Screw hole, 5b...Male thread, 5c...Step, 5d...
...Nut, 6...Adapter, 6a, 6b...Threaded hole, 6c...Adapter plate, 6d...Male thread, 6e...Through hole, 7...Common tension rod, 7a...Male thread, 7b...Male thread, 7c
... Stop plate, 8 ... Center hole jack, 8a ... Center hole, 9 ... Rotation drive part, 9
a... Rotating drive unit casing, 10... Rotating body,
10a... Spur gear, 10b... Thrust bearing, 1
0c...Button, 10d...Circlip, 1
0e...Groove, 10f...Key, 10g...Bolt, 10h...Through bolt, 11...Cylinder, 11a...Cylinder head, 12...Ram, 12a...Head cap, 12b...Cylindrical piece, 12c... ... Nut, 13... Jacket air, 13a... Opening, 14... Bolt, 15...
Flexible shaft, 16... Harmonic drive component, 16a... Input shaft, 16b
...Key, 16c...Oval plate, 16d...Output shaft, 16e...Flex spline, 16f...Fixed gear, 16h, 16g...Ball bearing,
17...Pinion, 18...Cup ring, 19
...Fixed ring.

Claims (1)

[Scope of utility model registration request] In a PC steel material tension fixing device for applying tension to a PC steel material each having a threaded portion connected to an end thereof and tightening a nut screwed into the threaded portion, a plurality of the PC steel materials are provided.
a common tension rod connected to the steel material through the threaded portion, and a joint air;
a center hole jack through which the common tension rod is attached and which pulls the common tension rod; a rotating body having a gear on its outer periphery and engaging each of the nuts, and a gear corresponding to each of the nuts; and a rotary drive section having a pinion that meshes with each other and transmitted via a flexible shaft, the rotary drive section and the rotating body are supported by a rotary drive section casing separated from the jacket air, and can be freely inserted into and removed from the jacket air. A tension fixing device for PC steel material, which is characterized by being stored in.