JPH0429924B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates to a method for hoisting a boiler drum of a large boiler.

[Prior art]

Conventionally, boiler frames 1A and 1B were installed on the left and right sides of a large boiler as shown in FIGS. 4 and 5.
When installing the boiler drum 2 on the upper part of the boiler drum 2, the lifting pieces 3A and 3B provided on the left and right of the upper part of the boiler drum 2 placed at the lower position of the arrow A in Figs. 4 and 5. The wires 4A and 4B are attached to each other, and the large boiler is lifted up using a winch to the installation position indicated by arrow B at the top of the large boiler. In this case, the distance X between the left and right boiler frames 1A and 1B is Since it is smaller than the length Y in the left-right direction, the boiler drum 2 is lifted in an inclined state as shown in FIG.

However, if the lifting pieces 3A and 3B are used to lift the boiler drum 2 at an angle like this, the center of gravity W of the boiler drum 2 moves to the left as it is lifted, as shown in FIG. It was necessary to attach one end of the auxiliary wire 5 to the lifting piece 3A and lift it while constantly pulling the other end from the upper right side, which is what is called diagonal pulling.

This is because the positions of the lifting pieces 3A and 3B are attached to the upper part of the boiler drum 2, so the position of the center of gravity W shifts as the boiler drum 2 rises during lifting, which is corrected using the diagonal pulling auxiliary wire 5. This is to do so.

However, as mentioned above, providing the auxiliary wire 5 for diagonal pulling and lifting it while constantly pulling it not only makes the operation extremely complicated, but also requires changing the inclination angle α of the boiler drum 2. , there is a problem that the tension of the auxiliary wire 5 varies, which is dangerous.

[Purpose of the invention]

Therefore, the present invention solves the above-mentioned conventional problems,
By eliminating the diagonal pull of the boiler drum,
The purpose is to make operations easier and safer when hoisting a boiler drum.

[Structure of the invention]

That is, the boiler drum hoisting method of the present invention is as follows:
When lifting the boiler drum up to the installation position at the top of a large boiler while tilting the boiler drum using two lifting pieces installed on the left and right sides of the boiler drum, it is necessary to lift the boiler drum to the front, rear, left and right sides perpendicular to the lateral center line of the boiler drum. It is constructed by hoisting it up via wires from hoisting pieces provided at two locations.

〔Example〕

An embodiment to which the method of the present invention is applied will be described below with reference to the drawings. First, Fig. 1 is a front view showing a boiler lifting device in an embodiment of the present invention, and Fig. 2 is a side view of Fig. 1. Similarly to the conventional example shown in FIG. 4, the boiler drum 2 of this large boiler, which is composed of boiler frames 1A and 1B, is tilted from the lower position of arrow A by lifting pieces 3A and 4B on the left and right sides. In this state, the wires 4A and 4B are hoisted up by the winch 6 to the installation position shown by the arrow B at the top of the large boiler.
Lifting pieces 3A and 4B are respectively provided on the front and rear sides of the boiler drum 2 in the HH direction shown in FIG.

These two left and right lifting pieces 3A, 3A
As shown in FIG. 3, spreading beams 7A and 7B are attached to the wires 4A and 3B, respectively, via lifting wires 10, and wires 4A and 4B are connected to winches 6 and 3B via lifting wires 10, respectively, as shown in FIG. By winding up the boiler drum 2, the boiler drum 2 is tilted at a constant angle of inclination α and lifted up to the installation position above the large boiler.

[Effect]

As in the boiler drum 2 of the present invention, by providing the left and right lifting pieces 3A, 3A and 3B, 3B at the front and back of the lateral side perpendicular to the center line Z-Z of the boiler drum 2, the center of gravity of the boiler drum 2 can be adjusted. The conventional movement of W is eliminated, the conventional diagonal pulling auxiliary wire 5 shown in FIG. 4 is no longer necessary, and the operation of pulling the auxiliary wire 5 is also no longer necessary.

〔Effect of the invention〕

Therefore, by adopting the method of the present invention, it is possible to eliminate diagonal suspension of the boiler drum, which has the effect of making the lifting operation easier and safe, and further improving the lifting equipment. It is extremely effective in reducing work costs.

[Brief explanation of drawings]

Fig. 1 is a front view of a boiler drum hoisting device for a large boiler according to an embodiment of the present invention, Fig. 2 is a side view of the large boiler shown in Fig. 1, and Fig. 3 is an enlarged side view of the boiler drum shown in Fig. 1. 4 is a front view of a conventional boiler drum hoisting device for a large boiler, and FIG. 5 is a side view of FIG. 4. 2... Boiler drum, 3A, 3B... Lifting piece, 4A, 4B... Wire, Z-Z... Left and right center line.

Claims (1)

[Claims] 1. When hoisting the boiler drum to the installation position at the top of the large boiler while tilting the boiler drum using the lifting pieces installed on the left and right sides of the boiler drum,
A method for hoisting a boiler drum of a large boiler, characterized in that the boiler drum of a large boiler is hoisted via a wire to hoisting pieces provided at two places on the left and right, front and back, on the lateral sides perpendicular to the center line in the left and right direction of the boiler drum.