JP2002180699A - Method for installing chimney observation platform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work environment and to facilitate accuracy management. SOLUTION: First, an outer cylinder 1 is constructed, and a hydraulic elevator 6 is installed in portions at required intervals in the circumferential direction of the outer periphery of the outer cylinder 1 on the ground. A work stage 8 extending in the circumferential direction in the outer periphery of the outer cylinder 1 is placed on each hydraulic elevator 6. Subsequently, a chimney observation platform 4 is assembled and carried on the work stage 8. After that, the observation platform 4 is raised with the work stage by the hydraulic elevator 6, and when it reaches a required height, the observation platform 4 is fixed to the outer periphery of the outer cylinder 1. After that, the work stage 8 is lowered by the hydraulic elevator, and then dismantled and removed. During the lifting work and fixing work for the observation platform 4, with the observation platform 4 always carried on the work stage 8, various works are performed on the work stage 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a chimney observation deck used for installing an observation deck on an outer periphery of a RC stack at a required height.

[0002]

2. Description of the Related Art For example, one type of chimney installed in a facility equipped with a combustion furnace, such as a refuse incineration plant, includes one or more inner cylinders serving as a flue and an RC outer cylinder for supporting the inner cylinder. There is an RC chimney consisting of a tube.

In such a chimney made of RC, there is a case where an observation deck whose main structure is made of steel is provided on the outer periphery of the upper required height position. In this case, the observation deck assembled on the ground is conventionally attached to the chimney top. A lift-up method was used in which the equipment was lifted up to the required height and installed.

The lift-up method is described in detail below. First, as shown in FIG. 2 (a), an outer cylinder 1 made of RC is constructed, and an outer cylinder 1 is provided on the top of the outer cylinder 1 so as to protrude outward. An upper gantry 2 having a diameter larger than the outer diameter of the cylinder 1 is installed.
At the required circumferential location of the peripheral protruding end of the above, the lifting heavy equipment 3 such as a plurality of lift jacks is installed.
On the ground, the observatory 4 is assembled so as to surround the outer periphery of the base end of the outer cylinder 1 and connected to the lower end of the step lot 5 hung from each of the hoisting heavy machines 3, and then to FIG. As shown, the lifting of the step lot 5 is performed synchronously by each lifting heavy machine 3, so that the observatory 4 is gradually raised on the outer peripheral side of the outer cylinder 1, as shown in FIG. The observatory 4 is raised to a predetermined height position, and then the observatory 4 is fixed to the outer cylinder 1 so that the observatory 4 is installed.

[0005]

However, in the method of installing the chimney observatory according to the lift-up method, the observatory 4
In the case of lifting, there is a problem that the tubular body of the outer cylinder 1 bears the total reaction force, and it is necessary to install the heavy equipment 3 dedicated for lifting on the top of the outer cylinder. There is a problem that it becomes extremely large, and for this reason, it is necessary to rely on a specialized company.

Further, in general, the outer cylinder 1 is constructed by casting concrete while raising the working floor with the formwork. However, since the working floor is located inside the outer cylinder 1, the outer cylinder 1 is accurately positioned. The outer diameter cannot be measured, so that the outer diameter of the outer cylinder 1 has a larger dimensional error toward the upper end. When the outer diameter of the outer cylinder 1 changes in the vertical direction due to such a dimensional error, interference between the outer surface of the outer cylinder 1 and the inner peripheral portion of the observatory 4 may occur when the observatory 4 is lifted. However, during the lifting of the observation deck 4 in the lift-up method, even if the interference as described above occurs, it is difficult to approach the observation deck 4 and it is difficult to perform the correction work. At the stage of assembling the observatory 4 on the ground, a large clearance must be set in advance between the inner dimension of the observatory 4 and the outer diameter of the outer cylinder 1.
There is also a problem that accuracy control is difficult.

Therefore, the present invention eliminates the need to install a heavy machine dedicated to lifting at the top of the outer cylinder, eliminates the need for a high-level work that must be performed by a specialist, and eliminates dimensional errors in the outer cylinder. In addition, it is intended to provide a method of installing a chimney observatory that can easily cope without setting a large clearance in advance on the outer circumference of the outer cylinder and the inner circumference of the observatory, thereby facilitating accuracy control. is there.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method of installing a chimney observatory for installing an observatory at an outer periphery at a required height of a RC chimney. At the required circumferential position of the chimney outer circumference, a ground-operable hydraulic elevating device is installed, and then, on each of the hydraulic elevating devices, a work stage extending circumferentially around the chimney is placed, Then, an observatory is assembled and mounted on the work stage, and thereafter, the observatory is pushed up to the required height position by the hydraulic elevating device integrally with the work stage. Make it fixed and installed.

After the observation platform is assembled on the work stage, the work stage is pushed up by the hydraulic elevating device, and is raised integrally with the work stage to a required height position. It is fixed to the periphery of the chimney. Since the observation deck is always mounted on the work stage during the lifting operation and the fixing operation of this observation deck, R
Even if the outer diameter of the chimney chimney changes due to a dimensional error and causes interference with the inner periphery of the observation deck, the location where the interference occurs can be easily approached on the work stage and corrected. Can be performed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 (a) (b) (c) (d) (e)
(F) shows an embodiment of a method for installing a chimney observation deck according to the present invention. First, as shown in FIG. 1 (a), an outer cylinder 1 made of RC is constructed. As shown, a plurality of ground-operable hydraulic lifting and lowering devices 6 are provided at a plurality of locations on the ground at a required circumferential interval on the outer periphery of the base end of the constructed RC outer cylinder 1.
(In the figure, the illustration of the hydraulic lifting device 6 installed on the front side of the outer cylinder 1 is omitted). The hydraulic lifting device 6
Is a column 7 extending vertically to support the object to be mounted.
And a column unit 7a having a length of 4 m can be connected to the lower end of the column 7 after lifting the column 7 by a required amount, for example, 4 m, near the ground. 7 lifting and support unit 7a
By repeating the connecting operation of (1), the support unit 7a is successively added from below to extend the entire length of the support 7 so that the object to be mounted can be raised,
On the other hand, on the other hand, the support unit 7a is sequentially removed from the lower end of the support 7 to reduce the length of the support 7 so that the object to be mounted can be lowered.

Next, as shown in FIG. 1 (c), a work stage 8 extending in the circumferential direction around the outer periphery of the outer cylinder 1 is assembled and mounted on the upper side of the column 7 of each hydraulic elevating device 6. , FIG.
As shown in (d), the observation deck 4 is assembled and mounted on the work stage 8 by using a crane (not shown) so as to surround the outer periphery of the outer cylinder 1.

Next, the respective hydraulic lifting / lowering devices 6 are operated synchronously so as to extend the columns 7, whereby the work stage 6
To raise the observation table 4 gradually together with the work stage 6, and then, as shown in FIG. 1 (e), when the observation table 4 is raised to a predetermined height position, the hydraulic pressure is increased. The lifting of the work stage 8 by the elevating device 6 is stopped, and the work of fixing the observation table 4 to the outer peripheral surface of the outer cylinder 1 is performed on the work stage 8, thereby setting the observation table 4.

Thereafter, the working stage 8 is gradually lowered by the hydraulic lifting device 6 and lowered to near the ground.
As shown in (f), the work stage 8 is dismantled and removed, and the hydraulic lifting device 6 is removed. Note that 9
Indicates a scaffold provided on the work stage 8 outside the observatory 4.

As described above, since the work of installing the observatory 4 is performed by pushing up from the lower side by the hydraulic elevating device 6 installed on the ground, the observatory 4 is lifted up, as in the conventional lift-up method. It is not necessary to install the lifting heavy machine 3 at the top of the observation platform, and the observation platform 4 is always mounted on the work stage 8 when the observation platform 4 is lifted and fixed to the outer cylinder 1. Therefore, the work environment can be dramatically improved by setting the work environment on the work stage 8, and the installation work of the observatory 4 can be performed without requiring a specialized contractor.

In addition, when interference occurs between the outer peripheral surface of the outer cylinder 1 and the inner peripheral portion of the observatory 4 due to a dimensional error of the outer cylinder 1, the work stage 8 must be It is not necessary to provide a large clearance in advance between the outer periphery of the outer cylinder 1 and the inner periphery of the observatory 4 because the correction work can be easily performed by approaching the above-mentioned interference point easily. Quality control can be easily performed.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

[0018]

As described above, according to the method of installing the chimney observatory according to the present invention, first, in the method of installing the chimney observatory for installing the observatory on the outer periphery at the required height position of the RC chimney, A ground-operable hydraulic lifting device is installed at the required circumferential position on the periphery of the chimney on the ground,
On each of the hydraulic lifting devices, a work stage extending in the circumferential direction at the outer periphery of the chimney is placed, and then an observation deck is assembled and mounted on the work stage.
It is pushed up to the required height position by the hydraulic elevating device integrally with the work stage, and then the observation deck is fixed to the chimney periphery and installed, so the top of the outer cylinder is used like the conventional lift-up method It is not necessary to install a heavy machine dedicated to lifting, and it is possible to always keep the observation deck mounted on the work stage when raising the observation deck and fixing it to the outer peripheral surface of the outer cylinder. Can be dramatically improved, and it is possible to carry out the installation work of the observation deck without the need for a specialized contractor.Also, due to the dimensional error of the outer cylinder, the outer peripheral surface of the outer cylinder and the interior Even when interference occurs between the outer cylinder and the outer cylinder, it is possible to easily approach the interference point on the work stage and perform the correction work each time. And the inner circumference of the observatory Not necessary to provide in advance a large clearance, there is exhibited an excellent effect that a precision control can be carried out easily.

[Brief description of the drawings]

FIG. 1 shows a procedure of an embodiment of a method for installing a chimney observatory according to the present invention.
(B) shows a state in which a hydraulic elevating device is installed, (c) shows a state in which a work stage is mounted on the hydraulic elevating device, (d) shows a state in which an observation deck is mounted on the work stage, and (e). FIG. 6 is a schematic side view showing a state where the observatory has been raised to a required position, and FIG. 6F is a schematic side view showing a state where the hydraulic lifting device and the work stage have been removed.

FIG. 2 shows a procedure of a conventional method of installing a chimney observatory. (A) shows a state where the observatory is assembled on the ground;
(B) is a schematic side view showing a state in which the observatory is being lifted, and (c) is a schematic side view showing a state in which the observatory has been lifted to a required height position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 4 Observation deck 6 Hydraulic lifting device 8 Work stage

Claims (1)

[Claims] 1. A method of installing a chimney observatory on an outer periphery of a chimney stack made of RC at a required height position, the method comprising: A lifting device is installed, and then, on each of the hydraulic lifting devices, a work stage extending circumferentially around the chimney is placed, and then an observation deck is assembled and mounted on the work stage, Thereafter, the observatory is pushed up to a required height position by the hydraulic lifting device integrally with the work stage, and thereafter, the observatory is fixedly installed on the periphery of the chimney. .