JP5579584B2 - How to replace the pressure disc - Google Patents

Description

The present invention makes it possible to adjust and fix the position without inserting a finger between the plates in a high stress state when installing the separation type pressure disk without completely releasing the axial force of the anchor. The present invention relates to a pressure disk replacement method .

Conventionally, a hydraulic thin load meter is often used as an anchor axial force measuring device.
These shapes are donut-shaped, and if subsequent measurement becomes impossible due to oil leakage or unexpected factors, they cannot be installed again unless the anchor load is released and replaced.
Therefore, the load meter can be installed without completely releasing the axial force of the anchor by making the load meter half-crack and improving the shape so that it can be sandwiched from the side (hereinafter referred to as a separate pressure disk). Has been proposed (see, for example, Patent Document 1).

According to Patent Document 1, the following problems can be improved.
1) Since it is not necessary to release the tension of the anchor, the structure does not become unstable.
2) If the anchor can be re-tensioned and the anchor load is released, the load gauge should be used even if it is judged that the wire is drawn from the PC steel and cannot be re-tensioned or re-fixed. Can be replaced or installed.
And when this separation type pressure disk is used as a new installation, it is installed between the upper plate and the lower plate.
It can also be used as an alternative to a load cell that has been additionally installed on an existing anchor or damaged (when subsequent measurement is impossible due to oil leakage or unexpected factors).

JP 2007-126283 A

However, the separation type pressure disk disclosed in Patent Document 1 has a small outer diameter with respect to the upper and lower anchor plates, and thus has to insert a finger between the upper and lower anchor plates when adjusting or fixing the position. Often not. For this reason, the worker is forced to perform unreasonable work.
Further, it has been difficult to efficiently and accurately perform installation or replacement work of the separation type pressure disk.

The present invention has been made to solve such a conventional problem, and its purpose is to provide a plate in a high stress state when installing a separate pressure disk without completely releasing the axial force of the anchor. It is an object of the present invention to provide a pressure disk exchanging method capable of adjusting and fixing the position without inserting a finger between the plate and the plate.

According to the first aspect of the present invention, when the pressure disk installed between the lower anchor plate and the upper anchor plate is replaced in order to measure the axial force of the anchor, the upper anchor plate is pressed toward the lower anchor plate. The process of flattening the pressure disk, and a new separation with a split centering jig attached to the outer circumference that is larger than the outer diameter of the upper and lower anchor plates and thinner than the new separation type pressure disk and connected via a hinge The process of inserting the mold pressure disk onto or under the flattened pressure disk between the upper and lower anchor plates and the both ends of the centering jig are pulled and overlapped to bring the separation type pressure disk into the upper and lower The process of placing the anchor plate in the center; A step of clamping the serial separation type pressure disc between the upper and lower anchor plate, and having a step for removing the centering tool.

  According to the present invention, when a separate pressure disk is installed in a newly installed anchor or an existing anchor without completely releasing the axial force of the anchor, a finger is not inserted between the plates in a high stress state. The position can be adjusted and fixed reliably.

It is explanatory drawing which shows the state before the combination of the centering jig | tool and pressure disk which concern on 1st embodiment of this invention. It is explanatory drawing which shows the state after the combination of the centering jig | tool and pressure disk which concern on 1st embodiment of this invention. It is explanatory drawing which shows the state which attached the combination body of the centering jig | tool and pressure disk which concern on 1st embodiment of this invention to the anchor head. It is explanatory drawing which shows the replacement procedure of the pressure disk which concerns on 2nd embodiment of this invention.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
1 to 3 show a centering jig 10 used when a pressure disk is installed in an anchor according to a first embodiment of the present invention.
The centering jig 10 is provided on the outer side of the semicircular arc-shaped split member 11 having the arc-shaped recess 12 and the semicircular arc-shaped split member 11 so that the separation type pressure disk 21 can be sandwiched from the outer periphery. A handle 13, a hinge 14 that rotatably couples the half-arc-shaped split member 11, and a joining piece 15 provided on the open end side of the half-arc-shaped split member 11.

The centering jig 10 is made of, for example, a material thinner than the thickness 8 mm of the separation type pressure disk 21. Therefore, even if a load larger than the residual tension force of the existing anchor is introduced to the anchor, for example, as shown in FIG. 4, the anchor is not sandwiched and fixed between the lower anchor plate 22 and the upper anchor plate 23. It can be easily pulled out by holding the piece 15.
Further, since the centering jig 10 has an outer shape larger than that of the upper and lower anchor plates 22 and 23, it is necessary to insert a hand between the upper and lower anchor plates 22 and 23 only by operating the handles 13 and 13 protruding outward. There is no. Further, after the separation type pusher disk 21 is attached, it can be easily taken out by pulling the joining pieces 15 and 15 or the handles 13 and 13 outward. For this reason, it is possible to eliminate a risk factor at the time of attaching the conventional separation type pusher disk.

As shown in FIGS. 1 to 3, the separation-type pressure disk 21 includes two thin jacks 21 a and 21 b formed in a half donut shape, and a connecting tube 21 c that connects the two thin jacks 21 a and 21 b. Has been. The connecting pipe 21c is resistant to bending, and therefore, the two half-doughnut-shaped thin jacks 21a and 21b can be opened on both sides.
The two thin jacks 21a and 21b superimpose two metal thin plates having a semi-doughnut shape as described in the cited document 1, and the shape of the metal thin plate is between the two metal thin plates. It is comprised by inserting | pinching and welding two circular-arc-shaped spacers and linear spacers manufactured according to this.

An oil feed pipe 21d for feeding pressure oil into the two thin jacks 21a and 21b is inserted and joined to the thin jack 21a. A pressure transducer 21g connected to the Bourdon tube 21f and the pressure oil injection side is attached to the other end of the oil feed tube 21d.
An air vent pipe 21e is inserted and joined to the thin jack 21b from the outer peripheral direction. A check valve 21h is attached to the other end of the air vent pipe 21e.
In order to check the tension of the anchor, oil is injected from the inlet of the oil feed pipe 21d. At this time, the air inside the check valve 21h escapes from the air vent pipe 21e, and the inside is filled with oil. Since the two half-doughnut-shaped thin jacks 21a and 21b are connected by the connecting pipe 21c, the oil is filled in the other thin jack 21b through this.

FIG. 4 shows a procedure in which the pressure disk 20 in the existing anchor according to the second embodiment of the present invention is damaged and replaced with the separation-type pressure disk 21.
First, as shown in FIG. 4A, the existing pressure disk 20 is broken.
The existing pressure disk 20 is disposed between the lower anchor plate 22 and the upper anchor plate 23.
Next, as shown in FIG. 4B, in order to lift the upper anchor plate 23 and the anchor head 24, the joint coupler 25 and the tension bar 26 are set.
For example, two tension jacks 27 are arranged around the anchor head 24, the first reaction force material 28 is placed on each tension jack 27, and the joint coupler 25 is attached to the anchor head 24 on the first reaction force material 28. A second reaction force material 29 for fixing the tension bar 26 is placed.

Next, as shown in FIG. 4 (c), each tension jack 27 is driven to lift the upper anchor plate 23 and the anchor head 24 through the first reaction force member 28 and the second reaction force member 29, thereby The load is loaded on.
Next, as shown in FIG. 4D, the existing pressure disk 20 damaged from the gap between the upper anchor plate 23 and the lower anchor plate 22 is removed. When the damaged existing pressure disk 20 is a separation-type pressure disk, the connecting portion is removed and removed. If the damaged existing pressure disk 20 is a donut pressure disk, it is cut and removed.

  Thereafter, as shown in FIGS. 1 to 3, a new separation pressure disk 21 having a split centering jig 10 attached to the outer periphery is prepared, and the separation-type pusher disk 21 and the centering jig 10 are made substantially W-shaped. Inserting between the upper and lower anchor plates 22 and 23, operating the handles 13 and 13 of the centering jig 10 to overlap the open side ends 21a and 21a of the separation pressure disk 21, and attaching the separation type pusher disk 21 The position is adjusted, and the separation pressure disk 21 is fixed at a predetermined position.

Next, as shown in FIG.4 (e), the load by the tension | tensile_strength jack 27 is unloaded. Thereafter, the centering jig 10 is removed.
Finally, as shown in FIG. 4F, the joint coupler 25, the tension bar 26, the tension jack 27, the first reaction force member 28, and the second reaction force member 29 are removed.
As described above, after the existing pressure disk 20 is removed, a new separation-type pusher disk 21 can be fixed between the upper and lower anchor plates 22 and 23 by a safe and reliable operation.

  In the above embodiment, as shown in FIG. 4D, the case where the existing pressure disk 20 damaged from the gap between the upper anchor plate 23 and the lower anchor plate 22 is removed has been described. The present invention is not limited to this, and the damaged existing pressure disk 20 is crushed and flattened by the upper and lower anchor plates 22, 23, and a new separation-type pressure disk 21 is placed on or below the flattened damaged existing pressure disk 20. It may be attached via the centering jig 10.

  Moreover, although the said embodiment demonstrated replacement | exchange of the pressure disk 10 in the existing anchor, this invention is not restricted to this, For example, it can attach similarly also in a new anchor. At that time, the separation type pusher disk 21 provided with the centering jig 10 is inserted on the lower anchor plate 22, and then the upper anchor plate 23 is arranged and fixed under a predetermined load.

DESCRIPTION OF SYMBOLS 10 Centering jig | tool 11 Semi-arc-shaped split member 12 Arc-shaped recessed part 13 Handle 14 Hinge 15 Joining piece 20 Existing pressure disk 21 Separable pressure disk 22 Lower anchor plate 23 Upper anchor plate

Claims (1)

When exchanging the pressure disk installed between the lower anchor plate and the upper anchor plate to measure the axial force of the anchor,
A step of flattening the pressure disk by pressing the upper anchor plate toward the lower anchor plate;
A new separable pressure disk, which is larger than the outer diameter of the upper and lower anchor plates and thinner than the new separable pressure disk and is connected to the outer periphery by a split centering jig connected via a hinge, is placed between the upper and lower anchor plates. A process of inserting on or under the flattened pressure disk;
A step of pulling and overlapping both ends of the centering jig to place the separation type pressure disk at the center of the upper and lower anchor plates;
A step of sandwiching the separation type pressure disk between the upper and lower anchor plates;
And a step of removing the centering jig.

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