JPH08261405A - Structure and method for lifting top large beam of boiler - Google Patents

Abstract

PURPOSE: To lift top large beam by a simple construction, without necessitating substantial time and cost for operation, with safety and without using temporary equipment and space practically. CONSTITUTION: A space between a top large beam 2 suspending a boiler main body and a boiler structural steel pillar 3 fitted with a brackets 8 being a fixing member thereof is measured by a distance sensor 14. While the length of extension or contraction of a horizontal jack 11 of which the opposite ends are joined to the top large beam 2 and the boiler structural steel pillar 3 respectively is regulated so that the deviation of the value of the space from a set value be zero, dimensions are regulated by addition and subtraction so that the space between the brackets 8 provided for the boiler structural steel pillars 3 on the opposite sides be in conformity with the length of the top large beam 2, and the top large beam 2 is lifted and joined to the boiler structural steel pillars 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-scale boiler such as a boiler for commercial thermal power generation, in which a top girder for suspending a boiler body of a suspension boiler is lifted above a boiler steel column. Regarding

[0002]

2. Description of the Related Art A large boiler such as a commercial thermal power plant boiler has a structure in which a boiler body is suspended from a boiler top girder. FIG. 7 is a general side sectional view showing the relationship between the boiler main body, its ceiling (upper part of the boiler main body) and the top girder, and the installation height of the top girder 2 in a large boiler reaches 100 meters above the ground. The top girders 2 are usually installed at four or five locations on the boiler ceiling 1.

At the time of installing the boiler main body, first, a boiler steel column is assembled, and as shown in FIG. 10, the top girder 2 and the boiler ceiling are integrated near the ground and the jack 5 is used for hoisting. At the time of this hoisting, the load of the lifting body is applied to the position protruding from the steel frame column 3 to the boiler main body side, so that the steel frame column 3 is the side on which the load is applied by the rotational moment, that is, the boiler main body side as shown by the dotted line in FIG. Since the deformation δ occurs and the top girder 2 cannot be hung, various measures are taken.

FIG. 8 shows a conventional top girder and boiler ceiling 1.
It is a front view showing an example of a hoisting method with and [A]
Shows the state before the lifting [B] shows the state where the lifting is completed. The top girder 2 is finally connected to the bracket 8 on the top of the boiler steel column 3 and is supported by the boiler steel column 3. In order to lift the top girder 2, a temporary jack mount 4 is provided on the boiler steel frame pillar 3, a jack 5 is mounted thereon, and the tension rod 6 connects the jack 5 and the top girder 2. In the hoisting method shown in FIG. 8, as a measure for preventing the deformation of the boiler steel column 3, a method of attaching a long temporary girder beam 7 for handing over the left and right jack pedestals 4 is adopted.

FIG. 9 shows another example of a conventional method of hoisting a top girder. FIG. 9 is a front view, in which a temporary foundation 9 is constructed at a place several tens of meters away from the boiler steel-framed column 3, and the temporary foundation 9 and the upper part of the boiler steel-framed column 3 are connected to a temporary wire 10.
By connecting with and pulling with a constant tension at all times, the deformation of the boiler steel frame column 3 during the process of hoisting the top girder 2 is prevented. As shown in FIG. 9, attach the jack 5 on the bracket 8 on the top of the boiler steel frame pillar 3,
The jack 5 and the top girder 2 are connected by the tension rod 6 and the top girder 2 is hung.

[0006]

The above-mentioned prior art has the following problems. That is, in the conventional example shown in FIG. 8, a large temporary girder beam 7 having a length substantially the same as the length of the top girder 2 is required, which requires a great deal of cost and
It takes a lot of time to install and dismantle it, and also to adjust the distance between the right side bracket 8 and the left side bracket 8 that fit the top girder 2 to a size that fits the length of the top girder 2. It took a lot of time and money.

Further, the conventional example shown in FIG. 9 is a generally widely used method, but the temporary foundation 9 and the temporary wire 10 are used.
In addition to the large cost, it was not possible to lay the building at a thermal power plant where there are many existing buildings such as existing ones and additional ones. The long temporary girder beam 7 shown in FIG. 8 and the temporary foundation 9 and the temporary wire 10 shown in FIG. 9 are necessary only at the time of jacking up, and they are removed and discarded after the jacking up. The removal also required a great deal of money and time.

An object of the present invention is to hoist a top girder with a simple structure. It is an object of the present invention to hoist top girders without labor and expense. The present invention is to hoist a top girder such as a temporary foundation by a method that does not require auxiliary equipment and space required only when hoisting a top girder.

[0009]

The above objects of the present invention can be achieved by the following constitutions. That is, in the hoisting structure of the boiler top girder that suspends the top girder that suspends the boiler main body and connects it to the brackets provided on both sides of the boiler steel frame pillar on both sides that are the mating partners of both ends of the top girder, Distance measuring means for measuring the distance to the boiler steel frame column with a bracket that is the counterpart,
Expansion and contraction adjusting means for the space, means for connecting both ends of the expansion and contraction adjusting space for the top girder and boiler steel column,
A hoisting structure for a boiler top girder, comprising: a control unit that adjusts the expansion / contraction length of the expansion / contraction adjusting unit according to the detection value of the distance measuring unit. Here, a device that adjusts hydraulic pressure can be used as a means for adjusting the expansion and contraction of the distance between the top girder and the boiler steel column.

The above object of the present invention can be achieved by the following constitutions. That is, in the method of hoisting the top girder that suspends the boiler body, in the process of hoisting the top girder, the distance between the top girder and the boiler steel column with a bracket that is the mating partner is measured, and the measured value And the brackets provided on the boiler steel columns on both sides while expanding and contracting the intervals by the expansion and contraction adjusting means for the intervals, which are connected to the top girder and the boiler steel frame columns at both ends so as to eliminate the deviation between the set values. It is a method of hoisting a boiler top girder that connects the top girder and a boiler steel frame column by adjusting the dimensions so that the interval fits the length of the top girder and hoisting. Incidentally, the above measurement and adjustment of the present invention, the top girder collides with the deformation of the boiler steel column side and the bracket, or the final stage of hoisting occurs when the connecting part does not match, that is, the top girder is its counterpart. It is carried out from the time when it is hung up to the vicinity of the boiler steel column side bracket which is.

[0011]

According to the means of the present invention, the distance between the end of the top girder and the bracket-side bracket on the side of the boiler to which the girder of the top girder is attached is such that the final stage of hoisting and the hoisting operation are completed and the top girder is completed. Since the measurement and adjustment are performed through the process until the connection between the bracket and the steel pillar side bracket of the boiler is completed, the distance is always maintained at the optimum amount during this period.

[0012]

An embodiment of the present invention will be described with reference to the drawings.
1 shows a procedure for hoisting a top girder according to this embodiment, FIG. 3 is a view taken along the line AA of FIG. 1, and FIG. 4 is a view taken along the line BB of FIG. According to the present embodiment, in order to lift the top girder 2 as shown in FIG. 1, the vertical jack 5 is installed on the bracket 8 attached to the boiler steel column 3, and the vertical jack 5 and the top are attached by the tension rod 6. The girder 2 is connected and hung up.

A plate-shaped index 15 is vertically attached to the end of the top girder 2, and the index 15 is arranged at a position facing the distance sensor 14 attached to the boiler steel column 3 side. . In addition, the end of the top girder 2 and the boiler steel-framed column 3 are connected by a horizontal jack 11 which is expandable and contractible.
The joints (steel column side fulcrums 12, large beam side fulcrums 13) of the horizontal jack 11 and the top girders 2 and the steel frame columns 3 are not shown as universal joints capable of absorbing vertical and horizontal relative displacements. Use a cross joint.

A control unit 16 and a hydraulic unit 17 are provided on the top of the boiler steel column 3. A signal measured by the distance sensor 14 using the index 15 as an index is used by the control device 1
6, and the control device 16 can obtain the distance between the top girder 2 and the boiler steel frame column 3. The hydraulic pressure from the hydraulic unit 17 operates according to the measured distance between the top girder 2 and the boiler steel frame column 3. Although not shown, the hydraulic unit 17 incorporates an oil tank, a hydraulic pump, and a hydraulic control valve.

As described above, in this embodiment, the top girder 2 is hung up near the bracket 8 and the distance sensor 14 is used as the index 1.
When the distance from the control unit 16 is detected, the control unit 16 compares the measured value with a preset value to increase or decrease the hydraulic pressure of the hydraulic unit 17 to expand or contract the horizontal jack 11.

With this series of constructions, the deformation of the boiler steel-framed column 3 is automatically restored by expanding the left-right space at the uppermost part of the boiler steel-framed column 3, and further the distance between the opposing brackets 8 and 8 is increased. The top crossbeam 2
It is automatically adjusted to a dimension that fits the length dimension of. Note that this interval adjustment operation is performed in parallel with the hoisting operation, and does not delay the hoisting time.

FIG. 2 is a view showing a state in which the lifting of the top girder is completed according to the present embodiment. The distance sensor 14 detects the distance between the distance sensor 14 and the index 15, and the horizontal jack 11 brackets the bracket. A series of devices for adjusting the distance between the top girder 2 and the top girder 2 automatically restores and corrects the deformation of the boiler steel column 3 and completes the lifting of the top girder 2 to the originally installed height shown in FIG. To do.

FIG. 5 shows how to lift the top girder 2 according to another embodiment. When the connecting lines between the top girder 2 and the bracket 8 are perpendicular to each other, the distance sensor 1
4 and a plurality of horizontal jacks 11 are installed in the vertical direction, and are operated by sequentially switching from the lower level to the sensor 14a, from the jack 11a to the sensor 14b, and to the jack 11b in accordance with the height of the suspended top girder. ,
Distance measurement and adjustment of the distance are performed immediately before the upper surface of the top girder 2 reaches the height of the lower surface of the bracket 8.

FIG. 6 shows a top girder 2 according to an embodiment of the present invention.
2 is a conceptual diagram of a device that automatically measures and adjusts the distance between the side and the steel column 3 side, in other words, the end of the top girder 2 and the end of the bracket 8. The distance sensor 14 detects the distance to the index 15, and the control device 16 compares the measured value with a target value preset in the control device to increase or decrease the hydraulic pressure of the hydraulic unit 17 to increase or decrease the hydraulic unit. 17 and hydraulic piping 18
The horizontal jack 11 is configured to be expanded and contracted. The load detector 19 detects the load acting on the horizontal jack 11 from the hydraulic pressure, and the displacement detector 20 also detects and monitors the stroke displacement signal to ensure work safety.

[0020]

According to the present invention, the distance between the end portion of the top girder and the column-side bracket which is the mating partner of the top girder is automatically measured and adjusted to the optimum amount, which is a long time required conventionally. It does not require temporary girders, temporary foundations or long wires, and eliminates the need to manufacture, install, and remove them, which greatly reduces costs and time, and makes work extremely safe.

[Brief description of drawings]

FIG. 1 is a diagram showing a procedure for hoisting a top girder according to an embodiment of the present invention.

FIG. 2 is a diagram showing a completed state of hoisting a top girder according to an embodiment of the present invention.

FIG. 3 is a view taken along the line AA of FIG. 1 according to an embodiment of the present invention.

FIG. 4 is a view taken along the line BB of FIG. 1 according to an embodiment of the present invention.

FIG. 5 is a diagram showing a procedure for hoisting a top girder in an embodiment of the present invention.

FIG. 6 is a conceptual diagram of an apparatus for automatically measuring and adjusting a distance between a top girder and a bracket according to an embodiment of the present invention.

FIG. 7 is a side sectional view of a general boiler showing a relationship among a boiler, a top girder, and a boiler ceiling portion.

FIG. 8 is a diagram showing a procedure for installing a conventional temporary girder beam and hoisting a top girder.

FIG. 9 is a diagram showing a procedure for suspending a top girder by installing a conventional temporary wire.

FIG. 10 is a diagram showing a deformed state of the steel frame column when the top girder is hung without taking measures to prevent the deformation of the steel frame column.

[Explanation of symbols]

1 ... Boiler ceiling part, 2 ... Top girder, 3 ... Boiler steel column, 5 ... Vertical jack, 6 ... Tension rod, 8 ... Bracket, 11 ... Horizontal jack, 12 ... Steel column side fulcrum,
13 ... Large beam side fulcrum, 14 ... Distance sensor, 15 ... Index, 1
6 ... Control device, 17 ... Hydraulic unit, 18 ... Hydraulic piping,
19 ... Load detector, 20 ... Displacement detector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Haruo Arakawa 6-9 Takaracho, Kure-shi, Hiroshima Babcock Hitachi Co., Ltd. Kure Factory (72) Taiji Tsukiji 6-9 Takaracho, Kure-shi, Hiroshima Babcock Hitachi Ltd. Kure Factory

Claims (3)

[Claims] 1. A hoisting structure for a boiler top girder, in which a top girder that suspends a boiler main body is hoisted and connected to brackets provided on both sides of a boiler steel column on both sides that are mating partners of both ends of the top girder, Distance measuring means for measuring the distance between the top girder and the boiler steel-framed column with a bracket that is the counterpart of the top girder, and the distance adjustment means, and both ends of the distance between the top girder and the boiler steel-framed column. And a control means for adjusting the expansion / contraction length of the expansion / contraction adjusting means according to the detection value of the distance measuring means. 2. The hoisting structure for a boiler top girder according to claim 1, wherein a device for adjusting hydraulic pressure is used as a means for expanding and contracting the distance between the top girder and the boiler steel column. 3. A method of hoisting a top girder for suspending a boiler main body, wherein in the hoisting process of the top girder, a distance between the top girder and a boiler steel frame column with a bracket as a mating partner is measured. In order to eliminate the deviation between the measured value and the set value, it is provided on both sides of the boiler steel frame pillar while expanding and contracting the interval by the expansion and contraction adjusting means of the interval connected to both ends of the top girder and the boiler steel frame pillar. A hoisting method for a boiler top girder, characterized in that the top girder is connected to the boiler steel column by adjusting the dimensions so that the bracket intervals are adjusted to suit the length of the top girder and hoisting.