JPH0510565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a chimney lining layer peeling and removal device that is applied to removing a lining layer that has deteriorated over time on the inner wall of a steel chimney.

``Prior art'' ``Problems to be solved by the invention'' The conventional chimney lining layer peeling removal device
As shown in the figure.

01 is the chimney, 02 is the steel plate of the chimney 1, 03 is the lining layer, 04 is the gondola, 05 is the fixing stay, 06 is the rock drill, 07 is the pulley, 08 is the winch rope, 09 is the winch rope, winding Winch 010 is a worker.

On a gondola 04 that can go up and down inside the chimney 01, a worker 010 with a rock drill 06 such as an air breaker or a pick hammer performs the work of scooping out the lining layer 03 attached to the cylindrical steel plate 02 at the top (or bottom) of the chimney. ) will be implemented sequentially.

The gondle 04 is raised and lowered by a winch rope 08 via, for example, a pulley 07 attached to the top of the chimney and a winding drum 09. Gondola 04
To prevent the shaking of the
5 is attached.

A hammer drill like the rock drill 06 has the following problems.

(1) Noise pollution: Air breakers, pick hammers, and other hammer blowing methods generate noise of 80 to 100 horns in the case of steel chimneys, causing noise problems for nearby residents and making it impossible to carry out work early in the morning or at night.

(2) Safety and health regulations: The usage time of impact and vibrating tools is limited to two hours a day to prevent occupational diseases such as white wax and hearing loss (as per the Labor Standards Inspection Office).

(3) Increased construction period and increased cost: Due to regulations (1), residents are demanding shorter work times, and regulations (2) require securing more workers, resulting in increased construction period and cost. is unavoidable.

From the above point of view, a hydrostatic crushing method has also been proposed in which a conical tool is forcibly inserted and crushed by static pressure such as hydraulic pressure orthogonal to the surface of the lining layer 03. An example is shown in FIG.

011 and 012 are hydraulic cylinders, 013 is a pedestal, 014 is a conical tool, and 015 is a controller.

A conical tool 014 with a sharp tip is provided at one end of a hydraulic cylinder 011, 012 attached in the chimney radial direction to a gondola 04 that can be raised and lowered, and a pedestal 013 for taking a reaction force is provided at the other end.
By the operation 15, the lining layer 03 is statically crushed at a predetermined pitch.

In this example, problems (1) to (3) above can be solved, but the following new problems arise. (4) Local damage to the cylinder: Since the conical tool 014 is press-fitted perpendicularly to the surface of the lining layer 03 using powerful hydraulic pressure, permanent deformation (protruding deformation) 016 occurs locally on the outer surface of the steel plate 02.

(5) Increase in secondary work: The conical tool press-fit pitch is short (Note: To facilitate the removal of the lining layer 03 after a crack occurs, the thickness is usually 50 to 80 mm due to constraints on the crack width and propagation distance. In the case of lining, the press-fit pitch is usually about 100 to 150 mm.)
Therefore, the pitch of the protruding deformation 016 also becomes shorter.

On the other hand, the coating layer on the outer wall of the cylindrical body of the protruding deformed portion is accompanied by cracking and peeling. Therefore, after removing the lining layer 03, it is necessary to repaint virtually the entire outer wall, which increases cost and construction period. Furthermore, the crushing method as in this example requires the removal of broken reinforcing bars in addition to the removal of the lining.

``Means for solving problems'' The main cause of problems (1) to (3) is ``impact crushing''. Therefore, static pressure crushing, which does not use vibration due to hydraulic pressure, etc., will be adopted.

Problems (4) and (5) are that "static pressure fracturing" is used, but a sharp conical tool is pressed perpendicular to the lining surface, and the aim is to remove the entire thickness of the lining layer. by.

Therefore, a construction method is used in which the lining layer and the built-in vertical and horizontal reinforcing bars are "peel-removed" by inserting sharp peel-off pressure teeth at the interface between the lining layer and the steel plate surface of the cylinder under static pressure.

At this time, in order to take the reaction force of the pressing teeth, a serrated tool that bites into the steel plate wall in the direction opposite to the exfoliating pressing teeth is placed in a pressing state in the axial direction of the cylinder, and a cylinder that can be expanded and contracted in the axial direction of the cylinder is attached from this tool. , Attach a pressing tooth to the tip of the cylinder rod.

"Means for Solving the Problems" The present invention solves the above-mentioned conventional problems.
A telescopic cylinder that operates in the radial direction of the cylinder rod is attached to a gondola that can be raised and lowered within the chimney barrel and can be stopped at any position, and a tool that touches or bites into the exposed steel plate wall is attached to the tip of the cylinder rod. A cylinder that can be expanded and contracted in the axial direction of the cylinder rod is connected to the tool, and a pressure tool for peeling is attached to the tip of the cylinder rod, and the tip of the tool is always aligned with the interface between the steel plate and the lining layer to remove the chimney lining layer. This is a peeling and removing device.

``Effect'' (1) Since it is static pressure crushing, especially static pressure peeling that turns up the lining layer from the surface of the steel plate, there is no noise and the process becomes quiet.

(2) Since the peeling pressing teeth slide along the surface of the steel plate, there is no deformation of the steel plate and therefore no damage to the coating film.

(3) There are usually reinforcing bars in the lining layer vertically and horizontally. These vertical and horizontal stripes are held at their intersection points by stud weld bolts set perpendicularly to the steel plate and joined by tack welding or by thin wires. Therefore, when the lining layer is peeled off and removed at the interface, the reinforcing bars come off while bending while promoting the peeling and crushing of the lining layer, so that the work of removing and cutting the reinforcing bars can be omitted or significantly reduced. (Refer to the peeling situation of reinforcing bars and lining in Figure 1) (4) The reaction force P ₁ of the peeling pressing teeth is generated by the cylinders 5a and cylinder rods 5b radially attached to the gondola 4, as shown in the example in Figure 2. Pressure force of P ₁
The tip 6a of the serrated tool 6 pressed against the steel plate surface sinks into the steel plate.

In Fig. 3, instead of the sawtooth 6a, the tool 6 is used with a pressing force P via two surfaces of the steel plate and a hard rubber 10 (such as butadiene or isoprene rubber, which is often used in automobile tires) having a large elasticity and a coefficient of friction μ. The reaction force can be taken by the friction force generated by ₁ . That is, the peeling force can be ensured by maintaining the relationship P ₂ <μP ₁ .

Furthermore, as a method of reducing the reaction force _P2 from the peeling pressing teeth 9, as shown in FIG. 4a, the tip shape is tooth-shaped 9b or 9c as shown in FIG. 4b, rather than the blade-like shape 9a. is good. In a, the entire length of the cutting edge comes into contact with the joining line between the steel plate and the lining layer, while in b, one point on the tooth tip acts on the interface as a concentrated load, and after flaking occurs, the tooth tip in 9c causes the propagation of the flaking. and the reaction force P ₂
can be reduced. (Normally, the energy for the propagation of peeling is lower than the energy for the occurrence of peeling at the joint surface.) ``Example'' An example of the present invention is shown in Figures 1 to 4 a and b.
Shown below.

1 is a chimney, 2 is a cylindrical steel plate of the chimney 1, 3 is a lining layer, 4 is a gondola that can go up and down inside the cylindrical steel plate 2 and can be stopped at any position, 5a is expandable and contractable in the radial direction of the cylinder and is attached radially. hydraulic cylinder, 5b
6 is a cylinder rod of the hydraulic cylinder 5a, and 6 is a sawtooth-like unevenness 6 attached to the tip of the cylinder rod 5b.
7a is a hydraulic cylinder pivotally connected to a hydraulic cylinder 5a with a pin 8 and is expandable and retractable in the axial direction of the cylinder; 7b
9 is a cylinder rod of the hydraulic cylinder 7a, 9 is a peeling pressure blade attached to the tip of the cylinder rod 7b so that the tip always follows the interface between the cylindrical steel plate 2 and the lining layer 3, and 10 is a bolt nut 11 at the tip of the tool 6. 12 is a gondola hanging rope; 13 is a hard rubber having elasticity attached to the
1 is a pulley attached to the tip of the chimney, 14 is an operation panel, and 15 is an operator.

As shown in FIG. 1, a hydraulic cylinder 5a that is extendable and retractable in the radial direction of the cylinder is radially attached to a gondola 4 that can be raised and lowered within the chimney cylinder 2 and stopped at any position.
A tool 6 having a sawtooth-like unevenness 6a that abuts and bites into the wall surface of the steel plate 2 at the tip of the cylinder rod 5b.
A hydraulic cylinder 7a and a cylinder rod 7b, which are extendable in the axial direction of the cylinder body, are attached to the tool 6, and a peeling press blade 9 is attached to the tip of the cylinder rod 7b.

In this example, the peeling means is to remove a very small portion of the lining layer 3 at the top of the chimney (impact crushing is also acceptable for a small amount) to expose the two sides of the steel plate, and after stopping the gondola 4 at a predetermined position, the operator 15 By operating the operation panel 14, the hydraulic cylinder rod 5b is extended to press the tool 6 into contact with the steel plate 2 surface, and then the peeling press teeth 9 aimed at the step interface between the lining 3 and the steel plate 2 are pressed by the extension of the cylinder rod 7b. do. Predetermined length (mainly depends on the stroke amount of cylinder rod 7b)
After peeling, the cylinder rod 7b is contracted, then the cylinder rod 5b is contracted and the gondola 4 is lowered to complete one cycle, and this is sequentially repeated to complete the peeling.

In Fig. 2, the sawtooth 6a is applied to the support force on the surface of the steel plate 2 by the pressing force _P1 of the radial hydraulic cylinder 5a and the cylinder rod 5b, that is, the reaction force of the peeling press blade 9, at _P1 and _P2. This shows how to insert it into two sides of the steel plate.

FIG. 3 shows another embodiment of how to take the reaction force. That is, by pressing the hard rubber 10 having elasticity P ₁ against the two surfaces of the steel plate through the tool 6, according to this method, the two surfaces of the steel plate do not sink in and can be made intact.

In the present invention, the relationship of P ₂ <μP ₁ is maintained by utilizing the height of the coefficient of friction μ between the two surfaces of the steel plate and the ten surfaces of the hard rubber.

Figures 4a and 4b show the shape of the tooth tip of the peeling press blade 9. The tooth tip 9a in a is straight in a razor shape, and the tooth tip shape in b is an example in which the tooth tip in the center is placed in a straight line. This is an example in which the tooth tips 9b are arranged in a canine shape, and the tooth tips on both sides are arranged in a canine shape with the trailing tooth tips 9c trailing in the peeling direction.

"Effects of the Invention" Since the present invention is the above-mentioned device, (1) By pressing the steel plate through a tool that contacts or bites into the steel plate surface with a cylinder in the radial direction of the barrel, the cylinder axis can be removed from this tool. The reaction force can be supported from cylinders connected in the direction.

(2) Since the lining is removed using a cylinder using static pressure, problems (1) to (3) can be overcome.

(3) Because the lining is removed by peeling along the steel plate surface, there is no local deformation of the cylinder body. Therefore, there is no cracking or peeling of the paint on the outer wall of the cylinder, making repainting unnecessary.

(4) Peeling and removal is performed together with the vertical and horizontal reinforcement within the lining, so the reinforcing bars are also removed together with the lining, reducing the work required to remove the reinforcing bars.

(5) As shown in Fig. 4b, after peeling occurs under concentrated load, it propagates, so the peeling reaction force can be greatly reduced.

[Brief explanation of the drawing]

1 to 4 a and b show embodiments of the present invention. FIG. 1 is a vertical sectional view of the main part of the present invention, FIG. 2 is an enlarged view of part A in FIG. 1, and FIG. Other embodiments shown in the figure, FIG. 4, are detailed views of the exfoliating pressure blade, in which a shows an example where the cutting edge is straight in a razor shape, b shows an example where the leading tooth tip and the trailing tooth tip are arranged in a canine shape, 5 and 6 show a conventional chimney lining layer exfoliation removal device; FIG. 5 shows an example of digging with a rock drill, and FIG. 6 shows an example of hydrostatic crushing with a conical tool. 1: chimney, 2: cylinder steel plate, 3: lining layer,
4: Gondola, 5a: Hydraulic cylinder, 5b: Cylinder rod, 6: Tool, 7a: Hydraulic cylinder, 7
a: Cylinder rod, 9: Pressing tooth for peeling, 10:
Hard rubber, 12: Gondola hanging rope.

Claims (1)

[Claims] 1 A telescopic and radial cylinder that operates in the radial direction of the cylinder is attached to a gondola that can rise and fall within the chimney barrel and can be stopped at any position, and a tool that touches or bites into the exposed steel plate wall is attached to the tip of the cylinder rod. , a cylinder that is expandable and retractable in the axial direction of the cylinder rod is connected to the tool, and a pressure tool for peeling is attached to the tip of the cylinder rod, and the tip of the tool is installed so that it is always along the interface between the steel plate and the lining layer. Chimney lining layer peeling removal device.