JPH0441869A - Drill method and drill device for chimney inner surface - Google Patents

Abstract

PURPOSE:To dispense with chipping work by manpower on a high scaffold by tensely fixing an upper stage fixing device onto a chimney inner surface, spraying a super-high pressure water from a nozzle while positively and reversely rotating a turning driving device and raising a lifting support member at low speed. CONSTITUTION:A plurality of exhaust nozzles opened toward a chimney inner surface 10 from nozzles 11 provided on nozzle support member 8 top ends on both end parts of a lifting support member 18 are provided. The shoes 28 of an upper stage fixing device 4 is pressed into contact with and tensely fixed onto the inner surface 10, and the lifting support member 18 and the nozzles 11 are placed in the lower limit position. A super-high pressure water is sprayed from the nozzles 11 while positively and reversely rotating a turning driving device 2 and raising the lifting support member 18 at low speed. When the lifting support member 18 reaches the upper limit, the operation is stopped, the shoes 28 are separated to raise the upper stage fixing device, and this operation is successively repeated, whereby chipping process and chipping device moving process are repeated. Thus, chipping work by manpower on a high scaffold in a chimney is not required.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The second invention relates to a method and apparatus for polishing the inner surface of chimneys installed in thermal power plants, steel mills, etc. by using ultra-high pressure water injection. .

[Conventional technology]

BACKGROUND ART The inner surface of chimneys in thermal power plants, steel mills, etc. are generally lined with a ceramic material to withstand high-temperature exhaust gas. This lining deteriorates after being used for a period of time, so it is necessary to periodically repair the lining.

Traditionally, when repairing the lining on the inside of a chimney, a scaffold was assembled and constructed inside the chimney, and a worker broke off the lining using a cutting tool such as a breaker on the scaffold.
Next, a new lining was applied to the part of the chimney where the lining had been removed, and then the scaffolding was dismantled and removed.

[Problem to be solved by the invention]

When removing the lining inside the chimney, a high scaffold is assembled and constructed inside the chimney, which requires a large amount of scaffolding material, and it takes a long time to assemble, construct, dismantle and transport the high scaffold, so the lining repair period is long. Moreover, since the workers perform the cutting work using folding tools on high scaffolding,
In addition to being dangerous, it generates dust, noise, and vibrations from the scaffolding, which creates a poor working environment, and there is a risk that cracks may occur in areas other than the folds in the chimney.

The object of the present invention is to provide a method and device for cutting the inner surface of a chimney, which can advantageously solve the above-mentioned problems.

[Means to solve the problem]

In order to achieve the above object, in the method for cutting the inner surface of a chimney according to the present invention, the lower part of the rotating frame 3 rotated by the rotating drive device 2 is rotatably attached to the lower tension fixing device 1, and the rotating frame A support member 4 rotatably supporting the upper part of the frame 3 and an upper tension fixing device 5 are connected via an elevating telescopic device 6, and the rotating frame 3 is moved up and down by an elevating drive device 7. A nozzle support member 8 is attached so as to be movable up and down, and an ultra-high pressure water injection nozzle 11 for injecting ultra-high pressure water toward the inner surface 10 of the chimney 9 is attached to the nozzle support member 8. With the device 5 tensioned and fixed to the inner surface 10 of the chimney 9,
The rotation frame 3 is rotated by the drive of the rotation drive device 2, and the nozzle support member 8 is moved in the vertical direction by the drive of the lift drive device 7, and the ultra-high pressure water injection nozzle 11 is rotated and moved in the vertical direction. A scooping process in which the inner surface of the chimney 9 is scooped out with ultra-high pressure water jetted from the chimney 9, and an extension operation of the lifting conditioner W6 with one of the lower tension fixing device l and the upper fixing device 5 relaxed. After moving one of the tension fixing devices in the vertical direction, the tension fixing device is tensioned and fixed to the inner surface 10 of the chimney 9, and then, with the other tension fixing device being relaxed, the elevating telescopic device 6 is moved. After moving the other tension-fixing device in the vertical direction by the shortening operation, the moving process of tension-fixing the tension-fixing device to the inner surface 10 of the chimney 9 is repeated.

In addition, in order to achieve the above object, in the chimney inner surface scooping device of the present invention, three or more strut fixing members 13 are attached at equal angular intervals around the circular lower holding member 12. The tension fixing device 1 is configured, and the lower disk 14
The lower disk 14 of the rotating frame 3, which includes an upper disk 15 and a plurality of vertical guide members 16, is rotatably supported by the lower holding member 12 via a bearing,
The lower disk 1 of the rotating frame 3 is attached to the lower holding member 12.
4 and a lifting drive device 7 that rotates a vertical short rod 17 for lifting and lowering are fixed, and a lifting support member 18 is fitted into each guide member 16 so as to be able to rise and fall freely.
9 is screwed into the short elevating rod 17, the base end of the nozzle support member 8 is fixed to the elevating support member 18, and the tip of the nozzle support member 8 is attached to the inside of the chimney 9. Ultra-high-pressure water injection nozzle 11 that injects ultra-high-pressure water toward
is attached, and three or more tension fixing members 21 are attached at equal angular intervals around the upper holding member 20 to constitute the upper fixing device 5, which rotatably supports the upper disk 15. The supporting member 4 and the upper holding member 20 disposed above the supporting member 4 are connected via an elevating telescopic device 6.

〔Example] Next, the present invention will be explained in detail using illustrated examples.

FIGS. 1 to 5 show a device for cutting the inner surface of a chimney according to an embodiment of the present invention, in which a fluid pressure cylinder is arranged around a lower holding member 12 in the shape of a circular box with an open top. Three horizontal tension fixing members 13 are arranged radially at equal angular intervals, and the proximal end of each tension fixing member 13 is fixed to the outer peripheral surface of the lower holding member 12, so that the lower tension fixing device 1 A shoe 22 is pivotally attached to the tip of each tension fixing member 13 by a horizontal shaft 23, and the shoe 22 is held in a substantially constant posture by a posture holding spring (not shown).

The lower disk 14 and the upper disk 15 placed above the lower disk 14 are connected via vertical guide members 16 placed on both sides of the diameter line of these disks to constitute the rotating frame 3. The lower disk 14 in 3 is
A swing drive device is rotatably supported by the lower holding member 12 via a bearing 24, and is provided with an annular driven gear 25 at the lower part of the lower disk 14, and further includes a motor with a speed reducer at the lower part of the lower holding member 12. 2 is fixed, and a binion 26 fixed to the output shaft of the swing drive device 2 is meshed with the annular driven gear 25,
The rotating frame 3 is rotated.

The upper end of the vertical short rod 17 arranged to extend across the centers of the lower disk 14 and the upper disk 15 is rotatably supported by a bearing 27 provided in the center of the upper disk 15, and An elevating drive device 7 consisting of an electric motor with a speed reducer is fixed to the center of the lower part of the holding member 12, and the elevating short rod 1 is attached to the output shaft of the elevating drive device 7.
A female threaded portion 19 screwed into the short lifting rod 17 is provided at the center of the lifting support member 18 which is connected to the lower end of the lifting support member 18 and is slidably fitted into each guide member 16. When the short elevating rod 17 is rotated forward or backward by the elevating drive device 7, the elevating support member 18 is moved upwardly or downwardly.

The base end of a horizontal nozzle support member 8 consisting of a fluid pressure cylinder is fixed to both ends of the lifting support member 18, and the tip of the nozzle support member 8 is provided with ultra-high pressure water rotated by a nozzle rotating device. Injection nozzle! ■The nozzle is installed! (3) is an ultra-high-pressure water generator (not shown) that is equipped with a plurality of injection ports opening toward the inner surface 10 of the chimney 9 and supplies 1 g of high-pressure water (500 to 2,000 kN/dO), for example, ultra-high-pressure water mixed with an abrasive. , connected to the nozzle 11 via a hose 31, and the ultra-high pressure water generator is connected to the chimney 9, for example.
installed at the bottom of the interior.

A rotary ultra-high pressure water injection nozzle 11 having a plurality of injection ports and a nozzle rotating device are disclosed in Japanese Patent Application Laid-open No. 1-190.
Those described in Japanese Patent No. 891 can be used.

Three horizontal strut fixing members 21 made of fluid pressure cylinders are radially arranged at equal angular intervals around the upper holding member 20 disposed above the upper disk 15. An end portion is fixed to the outer peripheral surface of the upper holding member 20 to constitute the upper stage fixing device 5, and a shoe 28 is pivotally attached to the tip portion of each tension fixing member 21 by a horizontal shaft 29, and the shoe 28 is It is held in a substantially constant posture by a posture holding spring (not shown).

The upper end portions of a plurality of vertical elevating and retracting devices 6 made of hydraulic cylinders are fixed to the lower part of the upper holding member 20,
The lower end of each hoist telescopic device W6 is fixed to the support member 4,
The swing frame 3
An upper disk 15 is rotatably supported.

When polishing the inner surface 10 of the chimney 9 using the scraping device configured as described above, for example, as shown in FIG. By extending the fixing member 13 and bringing each shoe 8 into pressure contact with the inner surface 10 of the chimney 9, the seven-stage tension fixing device ff is tension-fixed to the inner surface 10 of the chimney 9, and by extending each of the tension fixing members 21, By pressing each shoe 28 against the inner surface 101.0 of the chimney 9, the upper fixing device 5 is fixed to the inner surface 101. : Tensioned and fixed, and the lifting support member 1B, nozzle support member 8, and nozzle 11 are placed at the lower limit position.

Next, by alternately repeating forward rotation and reverse rotation of the swing drive device 2, the swing frame 3 and the parts supported thereby are repeatedly rotated approximately 180 degrees at a low speed, and are raised and lowered. By operating the driving device 7 in the forward direction and rotating the lifting screw 17 in the forward direction, the lifting support member 18 supporting the nozzle support member 8 is moved upward at a low speed. Inner surface 10
Ultra-high-pressure water (for example, ultra-high-pressure water mixed with an abrasive) is injected toward the target.

In this way, each nozzle 11 ascends while repeatedly turning by approximately 180 degrees, so that the inner surface 10 of the chimney 9 is cut off all around by the ultra-high pressure water injected from each nozzle 11.

As shown in FIG. 7, when the lifting support member 18 supporting the nozzle support member 8 rises to the upper limit position, the operation of the swing drive device 2 and the lift drive device 7 and the nozzle 11
Then, as shown in FIG. 8, the tension fixing member 21 is shortened to separate the shoe 28 from the inner surface 10 of the chimney 9, that is, the upper fixing device 5 is relaxed. Then, after shortening the nozzle support member 8 as necessary, as shown in FIG. 9, the elevating telescoping device 6 is extended to move the upper stage fixing device 5 upward, and then as shown in FIG. , the tension fixing member 21 is extended and the shoe 28 is
is crimped onto the inner surface 10 of the chimney 9, that is, after the upper stage fixing device 5 is tension-fixed to the chimney 9, the tension fixing member 13 is shortened.

Next, as shown in FIG. 11, the elevating telescoping device 6 is shortened and the lower tension fixing device 1. Support member 4. After moving the rotating frame 3 and the parts supported by it upward, as shown in FIG. By operating the drive device 7 in reverse rotation and rotating the lifting screw 17 in the reverse direction, the lifting support member 18 supporting the nozzle support member 8 is moved up and down to the lower limit position.

Note that the lifting support member 18 supporting the nozzle support member 8
The downward movement may be performed at any time between the end of one combing process and the end of the vertical movement of the combing device.

Next, the above-mentioned operations are sequentially repeated, and the scooping process and the scooping device moving process are repeatedly performed.

When implementing the invention, the lifting drive device 7 may be fixed to the lower disk 14. Further, the downward movement process and the praying process of the scooping device may be repeated.Furthermore, when only one nozzle support member 8 is fixed to the lifting support member I8, the forward rotation of the swing drive device 2 The operation and reverse rotation operation are repeated to repeatedly rotate the nozzle 11 through about 360 degrees in forward and reverse directions.

The elevating/lowering telescopic device 6. As the tension fixing member 13 and the tension fixing member 21, a pneumatic cylinder, a hydraulic cylinder, or an electric telescopic cylinder having a short feed rod rotated by an electric motor may be used. may be made into four pieces each.

〔Effect of the invention〕

Since this invention is configured as described above, it produces the effects described below.

There is no need to assemble and construct a high scaffold inside the chimney 9 and have workers perform scooping work on top of that scaffold. The inner surface 1 of the chimney 9 is sprayed by the ultra-high pressure water sprayed from the ultra-high pressure water spray nozzle 11 that moves and moves vertically.
0 can be automatically folded, and by combining the loosening of one of the lower tension fixing device 1 and the upper fixing device 5 with the telescoping operation of the elevating telescoping device 6, the scooping device can be folded automatically. can be quickly moved vertically along the chimney 9, and therefore the work of scooping out the inner surface of the chimney can be carried out in a short period of time.

[Brief explanation of the drawing]

1 to 5 show a device for cutting the inner surface of a chimney according to an embodiment of the present invention. The figure is an enlarged vertical side view showing the vicinity of the revolving frame in Figure 1, Figure 3 is a sectional view taken along the line A-A in Figure 1, Figure 4 is a sectional view taken along the line B-B in Figure 1, and Figure 5 is a sectional view taken along the line A-A in Figure 1. The figure is a side view showing an ultra-high pressure water injection nozzle attached to the tip of the nozzle support member. Fig. 6 is a partially longitudinal side view showing the state in which preparation for cutting work is completed, Fig. 7 is a partially longitudinal side view showing the state in which the nozzle support member and the lifting support member have moved to the upper limit position, and Fig. 8 is the upper stage. A partially longitudinal side view showing the fixation device in a relaxed state;
Fig. 9 is a partially longitudinal side view showing a state in which the elevating extendable device is extended and the upper stage fixing device is raised, and Fig. 10 shows a state in which the upper stage fixing device is tensioned and fixed and the lower stage tensioning and fixing device is relaxed. FIG. 11 is a partially longitudinal side view showing a state in which the elevating telescopic device is shortened and the lower tensioning and fixing device is raised. In the figure, 1 is a lower tension fixing device, 2 is a swing drive device, 3 is a swing frame, 4 is a support member, 5 is an upper fixation device, 6 is an elevating telescopic device, 7 is a kidney excretion drive device, and 8 is a Nozzle support member, 9 is a chimney, 10 is an inner surface, 11 is an ultra-high pressure water injection nozzle, 12 is a lower holding member, 13 is a tension fixing member, 14 is a lower disk, 15 is an upper disk, 16 is a guide member, 17 18 is a short rod for lifting, 18 is a lifting support member, 19 is a female screw part, 2o is an upper holding member, 21 is a tension fixing member, 24 is a bearing, 25 is an annular driven gear, 26 is a binion,
27 is a bearing, 29 is a horizontal axis/shaft, 3o is a bearing, and 31 is a hose. Partial agent: Minoru Abe, Itsutsu Ouji

Claims (2)

[Claims] (1) The lower part of the swing frame 3 rotated by the swing drive device 2 is rotatably attached to the lower tension fixing device 1, and the support member 4 rotatably supports the upper part of the swing frame 3. The upper stage tensioning and fixing device 5 is connected via an elevating telescopic device 6, and a nozzle support member 8, which is moved up and down by the elevating drive device 7, is attached to the rotating frame 3 so as to be able to rise and fall freely. An ultra-high pressure water injection nozzle 11 that injects ultra-high pressure water toward the inner surface 10 of the chimney 9 is attached to the lower tension fixing device 1 and the upper fixing device 5.
is tensioned and fixed to the inner surface 10 of the chimney 9, the swing frame 3 is rotated by the drive of the swing drive device 2, and the nozzle support member 8 is moved vertically by the drive of the lift drive device 7. A scooping process in which the inner surface of the chimney 9 is scooped with ultra-high pressure water injected from the ultra-high pressure water injection nozzle 11 that is moved in the vertical direction, and one of the lower tension fixing device 1 and the upper fixing device 5 is relaxed. In this state, one of the tension fixing devices is moved in the vertical direction by the extension operation of the elevating telescoping device 6, and then the tension fixing device is tensioned and fixed to the inner surface 10 of the chimney 9, and then the other tension fixing device is tightened. In the relaxed state, the other tension fixing device is moved vertically by the shortening operation of the elevating telescopic device 6, and then the moving step of tension fixing the tension fixing device to the inner surface 10 of the chimney 9 is repeated. How to scoop out the inside of the chimney. (2) Three or more tensioning fixing members 13 are attached at equal angular intervals around the circular lower holding member 12 to constitute the lower tensioning fixing device 1, and the lower disc 14 and the upper disc 15
The lower disk 14 of the rotating frame 3 is rotatably supported by a lower holding member 12 via a bearing, and the lower disk 14 of the rotating frame 3 is rotatably supported by a lower holding member 12 through a bearing. 14 and a lifting drive unit 7 that rotates a vertical lifting screw 17 are fixed, and the female threaded portion 19 of the lifting support member 18 is fitted into each guide member 16 so as to be able to rise and fall freely. is screwed into the lifting screw 17, the base end of the nozzle support member 8 is fixed to the lift support member 18, and ultra-high pressure water is applied to the tip of the nozzle support member 8 toward the inner surface of the chimney 9. An ultra-high-pressure water injection nozzle 11 is attached, and three or more tension fixing members 21 are attached at equal angular intervals around the upper holding member 20 to constitute the upper fixing device 5, and the upper disk a support member 4 rotatably supporting 15;
The upper holding member 20 disposed on the upper part is a device for scooping the inner surface of the chimney, which is connected to the upper holding member 20 via the elevating and retracting device 6.