JPH045882B2 - - Google Patents

Description

[Detailed description of the invention] The outline of the boiler structure will be explained with reference to FIG.

The boiler body is suspended from a boiler supporting steel frame 1 by a hanging rod 2.

First, the furnace wall will be explained. As a general rule, the upper panel 3, lower panel 4, and burner panel 5 are collectively supported by the hanging rods 2 of the upper pipe header 6 on all four sides of the furnace wall.

If there is no upper header 6, a support plate is provided at the top of the upper panel 3 and supported by a hanging rod 2.

The hearth bottom panel 7 suspends a hearth bottom support beam 9 with a hanging rod 8 from a support plate provided at the lower end of the lower panel 4 of the front and rear walls, and a support frame 10 disposed on the upper surface of the support beam 9.
It has a structure that supports the panel.

Next, we will discuss the superheater, reheater, and energy saver.

A header 11 of a superheater and a reheater arranged at the front of the boiler is supported by a downcomer pipe 12. A superheater tube 13, a reheater tube 14, and an economizer tube 15 arranged in the furnace are supported by hanging tubes 16 and 17, and the hanging tubes are supported by an upper hanging rod 2.

Next, talking about piping and others, piping 18,
The smoke/air duct 19 and the like are supported from each step floor of the boiler support steel frame 1.

Furnace wall attachments such as the backstay 20 and the casing 21 that are directly attached to the furnace wall are all supported by hanging rods 2 on the upper part of the furnace wall.

Next, we will provide an overview of the conventional boiler module transportation method.

Conventionally, in the installation work of a boiler that is suspended from a boiler support steel frame 1, the boiler support steel frame 1 is first completed on a concrete foundation at the construction site, and then boiler parts are lifted and installed.

The dimensions and weight of each boiler component are determined by the conditions at the installation site, the construction machinery used, the means of transportation, etc.

Lifting of boiler parts is carried out using winches, cranes, etc., starting with the parts placed at the top, but since there are a large number of parts and the work is carried out in a small space, the on-site construction period is long. And it required a lot of workers.

In particular, in the case of export plants, the location is poor and a large amount of incidental equipment is required, such as camp facilities to accommodate workers, temporary equipment such as power supply and drinking water, and the domestic procurement and transportation of many construction machines such as vehicles and cranes. Construction costs were required.

The present invention was made in order to eliminate the drawbacks of the above-mentioned conventional examples, and its main purpose is to minimize the construction costs at overseas sites in the construction work of export plants, and (a) By shortening the construction period overseas and reducing the number of dispatched personnel, the aim is to reduce costs for incidental construction, including dispatch expenses, equipment such as camps, packaging for construction machinery and other consumables, and transportation costs.

(b) Improve work efficiency and reduce costs by shifting to work in Japan, where the work environment is better.

(c) Quality will improve as more work will be done in Japan, where the level of technology is high.

In other words, the present invention provides a boiler construction method in which the entire boiler is suspended from the top of the supporting steel frame, and the supporting steel frame of the boiler is suspended within the range of the upper part of the burner and the lower surface of the element located at the lowest stage of the superheater tube, etc. The entire boiler is manufactured by dividing into upper and lower modules, an upper module and a lower module, and these upper and lower modules are transported to the site using the supporting steel frame as a transportation frame, and then transported to the site using a temporary lifting frame. After hoisting the upper module to a slightly higher height than a predetermined height, lowering the lower module using a dolly to the upper surface of the foundation below the upper module and installing it, then suspending the upper module above the lower module, A method for constructing a suspended boiler, characterized in that both modules including the supporting steel frame are joined to complete the suspended boiler.

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

First, the structure will be explained.

The state of the upper module during transportation is shown in FIGS. 2 and 3, and explanations of each part are shown in FIGS. 4 to 10. Second
Fig. 3. Middle part a is a back wall pipe longitudinal steady rest (lugs added to the permanent version), b is a rear flue panel pipe longitudinal steady rest (permanent use), and c is a panel pipe horizontal steady rest (permanently installed). (shaped reinforcement), d is ceiling casing steady rest (temporary), e is front and rear flue panel pipes and pipe header (front and back steady rest), f is boiler horizontal load receiver (permanent use), g is back stay corner reinforcement ( temporary).

(a) The boiler body is connected to the support steel frame top beam 31b.
It is suspended by the hanging rod 32 of this equipment (second
figure).

(b) The load of tube elements 33 such as superheaters, reheaters, and economizers placed inside the furnace wall is supported by hanging pipes 34, and the tube elements 33 are attached to the furnace wall using steel materials 35, 36a, and 36b. 37 (Figures 2, 4, 5, and 6).

(c) The headers 38 of the superheater and reheater located at the front of the boiler are supported by downcomer pipes 39 (Fig. 2e, Fig. 7).

(d) The load of the ceiling housing 40 is supported by the suspension rod 32 from the supporting steel top beam 31b, but in order to receive the horizontal load, it is connected to the supporting steel top beam 31b with a temporary steel member 41 (second Figure d, Figure 8).

(e) The backstay 42 and the supporting steel beam 31b are connected by an earthquake stopper 43 of this equipment, and have a structure that receives horizontal loads (Fig. 3 f, 9
figure).

(f) The corner part of the backstay 42 is made of temporary steel material 4.
4 to increase rigidity (Fig. 3g, Fig. 10).

Next, the state when transporting the lower module is shown in the 11th and
In Figure 12, explanations of each part are shown in Figures 9, 10 and 13.
As shown in the figure.

(a) The hearth support beam 45 of this equipment is a temporary beam 46 installed between the supporting steel columns 31a with both ends extended.
(Fig. 11). Hearth support beam 4
5. The height of the lower surface of the temporary beam 46 is determined from the height of the transportation dolly 47 (FIG. 11).

(b) On the upper surface of the hearth support beam 45, there is a hearth bottom panel 48.
A support frame 49 for this equipment is provided to support the equipment (h in Fig. 11, Fig. 13).

(c) Furnace front/rear wall panels 37a, side wall panels 37
Furnace bottom support device 50a installed at the bottom of b.
Conventionally, round steel was used for 50b because only tensile force was applied, but in the present invention, shaped steel is used to prevent buckling due to axial force (first
1, 13).

(d) Once the upper and lower modules have been joined at the installation site, the load of the furnace panels 37a and 37b, which were supported by the furnace bottom support beam 45, will be transferred to the supporting steel frame top beam 31b of the upper module, so the furnace The extended portion of the bottom support beam 45 and the temporary beam 46 are removed.

(e) The structure of the earthquake stopper 43 installed between the backstay 42 and the supporting steel frame 31b, the reinforcing material 44 at the corner of the backstay 42, etc. is the same as that of the upper module (Figures 9 and 10).

(f) Both the upper and lower modules are transported after being lifted using the hydraulic jack of Dolly 47 itself.

(g) Construction work will include insulation, sheet metal work, and painting work for both the upper and lower modules.

Next, FIG. 14 shows the state during barge transportation.

(a) For both the upper module and the lower module, a temporary cradle 52 for receiving each support steel column 31a is attached to the upper surface of the deck 51 of the transportation barge, and the support steel column 31a is tightened with bolts and nuts 53.

(b) At the time of factory assembly, the supporting steel column 31a is placed on a temporary concrete foundation corresponding to the temporary pedestal 52.
is being built.

Next, the condition when lifting the upper module is shown in the 15th section.
This will be explained with reference to FIGS.

(a) This is a structure in which the module is lifted by a lifting type hydraulic jack system 55 installed at the top of a temporary lifting frame 54.

Even if the hydraulic jacks 55 are placed at the four corners of the entire module,
You may place as many as .

(b) The beam 31c at the bottom of the supporting steel frame has a large cross-sectional dimension and is reinforced with vertical braces 31d, and can be lifted by placing hydraulic jacks 55 at the four corners or transported by a dolly 47. The design is such that the entire supporting steel frame does not deform and excessive loads are not applied to any part of the boiler.

(c) The upper module shall be hoisted approximately 500m/m higher than the specified height before the lower module is brought in.

Next, the state when the lower module is carried in is shown in FIG. 18, and the state when the upper and lower modules are joined is shown in FIG. 19, and will be described.

(a) Transport the lower module using dolly 47,
It is lowered and installed on the top surface of the foundation using Dolly 47's own hydraulic jack.

(b) Next, lower the upper module, join the supporting steel columns 31a of the upper and lower modules, and then join the furnace tube, piping, etc.

(c) After the upper and lower modules have been joined, in Figure 19, the hearth support beam 45 and the temporary beam 46 are connected.
will be removed within the ranges A and B in the diagram. At the same time, the temporary lifting frame 54, hydraulic jack system 55, and other lifting equipment are dismantled.

(d) Figure 20 shows the state when the upper and lower module settings are completed.

Next, the operation of the above-mentioned transportation method of the present invention will be explained.

First, we will discuss how to support the vertical load on the upper module.

(a) The vertical load on the boiler body is shown in Figure 2.
It is suspended from the support steel frame top beam 31b by a hanging rod 32 of this equipment. The supporting steel frame top beam 31b is supported by the columns 31a.

(b) The supporting steel column 31a is supported in the following manner.

b) Supported by temporary foundations during factory assembly.

When transported by barge, it is supported by a temporary pedestal 52 (Fig. 14).

During transportation using the dolly 47, the lowermost beam 31c of the support steel frame is received by the dolly 47, and the load transmitted from the column 31a is transferred to the lowermost beam 31c.
and supported by a vertical brace 31d (first
Figure 5).

When lifting a module, the lowest beam 31c of the support steel frame is suspended, so the way the load is transmitted is the same as when it is transported by the dolly 47 (No. 15).
Fig. 18).

E. Once the upper and lower modules have been joined, support them with the pillars 31a of the lower module (Fig. 20).

Next, we will discuss the effect of supporting the horizontal load on the upper module (during barge transportation).

(a) The horizontal force that generates tube elements such as the superheater, reheater, and economizer placed in the furnace is controlled by the spacer hardware 35 of this equipment and the furnace internal pressure as shown in Figures 4 to 6. The strength of the metal supports 36, 36b is increased and transferred to the furnace wall 37.

(b) The horizontal load transmitted to the furnace wall or the horizontal load generated on the entire furnace wall is transmitted to the backstay 42 as shown in Figures 9 and 10, and the earthquake stopper 43
After that, it is stopped at the supporting steel beam 31a. In order to prevent the furnace wall from deforming at this time, the backstay 42
The corner portions of are reinforced with temporary steel members 44.

(c) Horizontal forces generated on the ceiling housing and other piping are supported by connecting them to the nearest supporting steel frame (Figures 7 and 8).

Next, we will discuss how to support the vertical load on the lower module.

(a) In FIG. 11, the entire load of the furnace wall panels 37a, 37b including the hearth panel 48 is received by the hearth support beam 45.

(b) The load transferred to the bottom support beam 45 is transferred to the temporary beam 46.
After that, it is supported by supporting steel columns 31a. If the strength of the hearth support beam 45 is insufficient, as appropriate,
The middle part will be supported from the ground with temporary steel.

(c) The supporting steel column 31a will be supported as follows.

b. During factory assembly, support will be provided with temporary foundations.

When transported by barge, it is supported by a temporary pedestal 52.

During transportation by the dolly 47, as shown in FIG. 11, the temporary beam 46 and the bottom support beam 45 are supported by the dolly 47, and the load of the column 31a is supported by the temporary beam 46.

D. Once the upper and lower modules have been joined, the pillars of the lower module will be supported by the local foundation.
The boiler body consists of the supporting steel top beam 31 shown in Figure 2.
b, supported by a hanging rod 32;

Next, we will discuss how to support the horizontal load on the lower module.

The horizontal load generated on the furnace wall is the same as in the case of the upper module, and is supported by the support steel beam 31b via the backstay 42 and earthquake stopper 43 shown in FIGS. 9 and 10.

The present invention described above has the following effects.

(1) In particular, it will be possible to shorten construction periods overseas, reduce dispatch costs due to fewer dispatched personnel, and reduce costs, including transportation costs for equipment, construction machinery, etc.

(2) Cost reductions and quality improvements can be expected due to improved work efficiency due to the increase in domestic construction work with good working environments.

(3) Although the module is divided into upper and lower parts,
There is very little reinforcement with temporary steel materials.

[Brief explanation of drawings]

FIG. 1 is a front view showing the boiler structure, FIG. 2 and subsequent figures relate to the present invention, FIG.
4 is a perspective view showing the support of the tube element load, 5 and 6 are both partial front views showing how the tube element is fixed to the furnace wall, and 7 is the header. Figure 8 is a partial front view of the ceiling housing steady rest, Figure 9 is a partial front view showing the structure that receives the horizontal load of the backstay and support beam, and Figure 10 is the backstay. Figure 11 is a front view showing the reinforcement of the corner part, Figure 11 is a front view showing the state when the lower module is being transported, Figure 12 is a sectional view taken along the line B-B in Figure 11, and Figure 13 is the hearth panel support. FIG. 14 is a partial front view showing the state during barge transportation;
15 to 17 show the state when the upper module is lifted, FIG. 15 is a front view of the state when the upper module is carried in, FIG. 16 is a front view of the state when the upper module is started to be lifted, and FIG. Figure 18 is a front view of the upper module when it has been lifted, Figure 18 is a front view of the lower module when it is being carried in, Figure 19 is a front view of the upper and lower modules being joined together, Figure 20
The figure is a front view showing the state when the setting of the present invention is completed. 31a, 31b, 31c... supporting steel top beam,
31d... Vertical brace, 32... Hanging rod, 33...
...Tube element, 34...Suspension pipe, 35,
36a, 36b... Steel material, 37... Furnace wall, 37a
...Rear wall panel, 37b...Side wall panel, 38...
... Header, 39 ... Downpipe, 40 ... Ceiling housing, 41, 44 ... Temporary steel material (reinforcing material), 42
...Backstay, 43...Earthquake stoppage, 45
... hearth support beam, 46 ... temporary beam, 47 ... dolly, 48 ... hearth bottom panel, 49 ... support frame,
50a, 50b... Furnace bottom support device, 51... Deck, 52... Temporary cradle, 53... Bolts and nuts, 54... Frame, 55... Hydraulic jack system.

Claims (1)

[Claims] 1 In a boiler construction method in which the entire boiler is suspended from the top of the supporting steel frame, the entire boiler including the boiler supporting steel frame is suspended within the range of the upper part of the burner and the bottom surface of the element placed at the lowest stage of the superheater tube, etc. The upper and lower modules are connected to the upper and lower modules.
The upper and lower modules were manufactured separately and transported to the site using the supporting steel frame as a transport frame, and at the site the upper module was lifted to a slightly higher height than the predetermined height using a temporary lifting frame. After that, the lower module is lowered and installed on the upper surface of the foundation below the upper module using a dolly, and then the upper module is suspended above the lower module, and both modules, including the supporting steel frame, are joined and suspended. A method of constructing a hanging type boiler, which is characterized by completing a type boiler.