JP4905949B2 - Call bunker and how to wake it up - Google Patents

Description

  The present invention relates to a coal bunker used in a coal-fired boiler facility, and more particularly to a call bunker suitable for shortening a construction period and ensuring work safety in a field installation work and a method for raising the same.

  In the installation work of the coal bunker for temporarily storing the coal in the coal-fired boiler facility, there is an operation of reversing the coal bunker from the shape at the time of transportation by raising the top and bottom.

  This is because the shape of the call bunker has a conical bunker hopper, and therefore, when the call bunker is transported or assembled at the installation site, it is delivered and assembled at the site with the hopper portion facing upward.

As a countermeasure, construct a steel frame that supports a plurality of call bunker bodies side by side, assemble the call bunker body at one point of the frame, slide it to the mounting position along the frame, and A method for installing a call bunker is described in Patent Document 1 below. In this method of installing the call bunker, a reinforcing member is attached to the outside of the main body to prevent deformation.
JP-A-5-179809

  If the method for installing the call bunker by the raising work is used, the call bunker is suspended, so that a local moment is applied to the hanging point of the bunker body, and the call bunker may be distorted or deformed. That is, the conical hopper part is turned upside down and the call bunker is turned upside down, and the pair of suspension pieces (trunnions) provided at opposite positions of the outer wall of the cylindrical part of the call bunker are turned as fulcrums. When the hopper side is in a normal state with the hopper side down, it is necessary to suspend the bunker wall using suspending pieces (trunnions) that are separated from each other. Excessive local bending moment on the bunker wall near the suspending point May occur and cause local deformation. For this reason, call bunkers must be reinforced to prevent distortion at the suspension points.

  Therefore, conventionally, reinforcement has been performed by suspending a temporary reinforcing beam inside the bunker of the cylindrical portion so as to directly connect a pair of trunnions provided on the opposing cylindrical portion wall surfaces. However, since such a reinforcing beam is a temporary member, it must be removed after the installation of the coal bunker. In addition, the work inside the call bunker is narrow because it is a closed work, and because it is a work in a high place, safety measures are required, man-hours are required, and the construction period is long. .

  In addition, the method for installing a call bunker in Patent Document 1 requires that a temporary frame be separately installed. In this case, the frame must be removed after the call bunker is installed, and thus there is a drawback that the equipment cost is high. It was.

  An object of the present invention is to provide a call bunker capable of shortening the construction period and ensuring the safety of work in the field installation work and a method for raising the call bunker.

The above-mentioned problem of the present invention is solved by the following means.
The invention according to claim 1 is a call bunker having a hopper portion composed of a cylindrical portion and a conical portion used in a coal-fired boiler facility, wherein the upper and lower sides in the circumferential direction of the outer wall surface of the cylindrical portion of the hopper portion The upper ring support, the lower ring support, the upper ring support, and the lower ring support are bridged in two stages, and a reinforcing support provided in a direction perpendicular to the ring support is provided. A call bunker in which a plurality of trunnions serving as fulcrums are provided on either the upper ring support or the lower ring support in the vicinity of the joint with the reinforcing support.

  A second aspect of the present invention is the call bunker according to the first aspect, wherein the suspension wire attachment portions are provided at the apexes of the trunnion and the conical portion of the hopper portion, respectively.

  According to a third aspect of the present invention, suspension wires are respectively attached to the trunnions of the call bunker according to claim 2 and the apexes of the conical portion of the hopper, and then the bunker is grounded using a crane. , Lift the suspension wire attached to the trunnion with a crane, lower the suspension wire attached to the top of the cone-shaped part of the hopper, and then continue to raise, completing the raising of the call bunker in the vertical direction Then, the hanging wire attached to the apex portion of the call bunker is removed, and the bunker is installed at a predetermined location.

  According to the first to third aspects of the present invention, the upper and lower ring supports provided on the outer wall surface of the coal bunker having the conical hopper used in the coal-fired boiler facility are provided between the ring supports. The trunnion provided on the reinforcement support and the ring support on the upper or lower part is integrated with the bunker body, and it is lifted from the ground using the trunnion, and then the call bunker is easily raised at a predetermined location. It can be installed and has the effect of reducing man-hours such as eliminating the work inside the call bunker.

Embodiments of the present invention will be described with reference to the drawings.
The size of the body of the coal bunker depends on the capacity of the boiler, but is often set to a size that can store an amount of coal used for combustion for about 8 to 10 hours. A call bunker main body having such a capacity is composed of the cylindrical portion 1 shown in FIG. 1A and the hopper portion 2 formed of a cylindrical portion and a conical portion. For example, it is disassembled into two blocks, and FIG. ), The cylindrical part 1 is installed on the ground as it is, and the conical hopper part 2 is installed on the ground in an upside down state.

  The hopper 2 is turned upside down after being lifted from the state shown in FIG. 1 (b), but the cylindrical portion 1 shown in FIG. 1 (b) is not turned upside down and is directly placed on the hopper 2 after being turned upside down. Install and weld.

  Further, the weight of each block of the cylindrical portion 1 and the hopper portion 2 disassembled into two parts depends on the performance of heavy equipment used at the installation site, but is often set to a mass of about 10 to 100 t. . In addition, the wall thickness of each block is about 6 to 20 mm, and the strength of the bunker wall surface against the work such as hanging the call bunker body in the installation work, upside down compared to the size and mass of the call bunker body Is not always sufficient, so reinforcement is required.

  As a reinforcing member for the wall surface of the call bunker main body, in this embodiment, as shown in FIG. 2, which is an enlarged view of the circle A in FIG. 1A, on the outer periphery of the wall surface of the cylindrical portion of the hopper portion 2 of the call bunker main body. A pair of upper and lower ring supports 3 and 4 are provided at intervals. The annular ring supports 3 and 4 are made of high-rigidity H-shaped steel, C-shaped steel or the like, and a pair of trunnions for attaching the ends of the suspension wires to diagonal positions on the outer periphery of the ring supports 3 and / or 4 5 and 5 are provided (the illustrated example is a case where trunnions 5 and 5 are provided on the ring support 3).

  FIG. 3A shows a structural view of the trunnion 5 provided on the ring support 3 and its peripheral portion as viewed from the direction opposite to the longitudinal section of the wall surface of the hopper 2 (the cross-sectional arrow along the line AA in FIG. 3B). 3 (b) is a cross-sectional view taken along the line BB in FIG. 3 (a), and shows a structural view of the trunnion 5 and its peripheral portion. The trunnion 5 serves as a fulcrum for rotating the hopper portion 2 of the bunker while being suspended by the wire 6, but the suspension wire 6 is used to rotate the hopper portion 2 while sliding the suspension wire 6 on the trunnion 5. A disengagement preventing portion 5a is provided at the tip of the trunnion 5 so that it is difficult to disengage.

  That is, the trunnion 5 has a circular cross-sectional shape that enables the call bunker to be rotated (raised) in a suspended state, and the suspension wire 6 is rotated while sliding on the surface of the trunnion 5.

  It should be noted that one or more reinforcing supports 8 for reducing the local moment of the trunnion 5 by connecting the upper ring support 3 and the lower ring support 4 to the outer wall surface of the cylindrical portion of the hopper portion 2 in the vicinity of the trunnion 5 Is provided. The reinforcing support 8 is arranged in the longitudinal direction in a direction orthogonal to the upper and lower ring supports 3, 4 and is provided to connect the upper and lower ring supports 3, 4. What is necessary is just to be able to connect a pair of ring supports 3 and 4 by welding. There is no problem even if the reinforcing support 8 is disposed so as to be in contact with the outer wall surface of the hopper portion 2, but in order not to increase the number of welding points, it is not always necessary to weld the hopper portion 2 to the wall surface. Even if it floats from the wall surface of the part 2, it does not matter.

  Further, a trunnion portion ring support reinforcing rib 9 is attached in the vicinity of the trunnion 5 as a reinforcing material against the local moment of the ring support 3 and / or 4 itself by connecting the trunnion 5 and the ring support 3 and / or 4.

  In the example shown in FIG. 3A, trunnion ring support reinforcing ribs 9 that reach the wall surface of the call bunker longer than the vertical height of the H-shaped steel constituting the ring support 3 are attached. This is because the width of 3 is smaller than the diameter (vertical height) of the trunnion 5, and if a trunnion portion ring support reinforcing rib 9 'having a length equivalent to the diameter of the H-shaped steel constituting the ring support 3 is used. The configuration is as shown in FIG. 3C instead of FIG. Note that an iron plate having a thickness of about 10 mm is used for the trunnion portion ring support reinforcing rib 9 '. FIG. 3D is an external view of the trunnion 5 and its vicinity showing a state in which the suspension wire 6 is attached to the trunnion 5.

When the bunker hopper 2 having the above-described structure is lifted, as shown in FIG. The weight W is shared by the pair of trunnions 5 and 5, and half of the weight W / 2. Further, a moment M is generated in a circle A portion of FIG. 4A on the wall surface of the hopper portion 2 of the trunnion installation portion as shown in FIG. 4B.
M = (W / 2) × L
However, L is the length from the portion of the suspension wire 6 provided on the trunnion 5 to the wall surface of the hopper 2.

Further, as shown in FIG. 4C, the portion of the circle B in FIG. 4B is as follows. The force Fa acting on the wall surface of the bunker hopper portion 2 by the generated moment M is as follows.
Fa = M / La
However, La is the height of the wall surface of the bunker hopper portion 2 where the moment M acts (= the length of the trunnion portion ring support reinforcing rib 9 in this embodiment).

  The length La is small, and an excessive force Fa acts on the wall surface of the bunker hopper portion 2 to cause local deformation on the wall surface. In order to prevent this, conventionally, as shown in FIG. 7, a connection beam 14 having a high rigidity for connecting the inner wall surfaces of the bunker hopper portion 2 of the pair of trunnion installation portions is provided. Since 14 is a temporary construction, it is necessary to remove the call bunker after it is installed at a predetermined location.

Therefore, as shown in FIG. 5, a reinforcing support 8 made of a rigid body is provided on the outer wall surface of the hopper portion 2 between the upper ring support 3 and the lower ring support 4 to act on the wall surface of the bunker hopper portion 2. The force Fb is Fb = M / Lb. However, the length Lb is the length of a line connecting the midpoints in the vertical direction of the upper and lower ring supports 3 and 4.

Where Lb >> La
And big enough,
Fb << Fa
The force Fb can be made sufficiently smaller than the force Fa, and local deformation of the wall surface of the bunker hopper 2 can be suppressed.
In this way, the call bunker can be lifted without local deformation of the wall surface of the bunker hopper 2.

The hopper portion 2 of the bunker having the above-described configuration is raised in the work steps shown in FIG.
In step 1, the suspension wires 6 are respectively attached to both the trunnion 5 and the conical top of the hopper 2 for raising the bunker hopper 2. Next, in Step 2, the bunker hopper part 2 is grounded using two heavy machines, and in Steps 3 and 4, the suspension wire 6 attached to the trunnion 5 is lifted by a crane, and the hopper part 2 has a conical top. Lower the attached suspension wire 6. In step 5, in order to raise the bunker hopper 2 further, one hanging wire 6 attached to the top of the conical shape of the hopper 2 closest to the ground is removed. Next, in step 6, the bunker hopper portion 2 is erected vertically by continuing the erection. Thereafter, the suspension wire 6 attached to the top of the hopper 2 is removed, and the raising of the bunker hopper 2 is completed in step 7, and the call bunker is installed at a predetermined location.

  According to the present invention, it is not necessary to attach and remove a reinforcing material for internal reinforcement, and a coal bunker that can be installed relatively easily is obtained, which contributes to a reduction in equipment cost of a coal fired boiler.

It is a side view (FIG.1 (a)) of the call bunker of one Example of this invention, and a figure (FIG.1 (b)) which shows the case where a bunker is disassembled and installed in the cylindrical part and the hopper part. It is an enlarged view in circle A of Drawing 1 (a). FIG. 3A is a structural view of a trunnion peripheral portion viewed from a direction facing a longitudinal section of a wall surface of a hopper portion of a call bunker according to an embodiment of the present invention (a cross-sectional view taken along line AA in FIG. 3B). 3 (b) is a cross-sectional view taken along the line B-B of FIG. 3 (a), FIG. 3 (c) is a structural view of a trunnion peripheral portion of another embodiment, and FIG. 3 (d) is a trunnion of a suspension wire. It is the external view of the trunnion which shows the state attached to, and its vicinity. It is a figure explaining the force which acts on a wall surface when the hopper part of the call bunker of one Example of this invention is lifted with the wire. It is a figure explaining the force which acts on a wall surface at the time of wire lifting at the time of attaching a reinforcement support to the outer wall surface of a hopper part. It is explanatory drawing of the raising work step of the call banker of one Example of this invention. It is a sectional side view of a prior art call bunker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical part 2 Hopper part 3, 4 Ring support 5 Trunnion 5a Detachment prevention part 6 Wire 8 Reinforcement support 9, 9 'Ring support reinforcement rib 11 Crane suspension wire 12 Suspension balance 14 Connection beam

Claims (3)

A coal bunker having a hopper part composed of a cylindrical part and a conical part used in a coal-fired boiler facility,
The upper ring support, the lower ring support, the upper ring support, and the lower ring support are bridged in two upper and lower stages in the circumferential direction of the outer wall surface of the cylindrical portion of the hopper portion, and orthogonal to the ring support. Reinforced support provided in the direction,
A call bunker, wherein a plurality of trunnions serving as fulcrums at the time of lifting and hanging are provided on either the upper ring support or the lower ring support in the vicinity of the joint with the reinforcing support.   2. The call bunker according to claim 1, wherein attachment portions for the suspension wires are provided at the apexes of the trunnion and the conical portion of the hopper.   A suspension wire is attached to each of the trunnion of the call bunker according to claim 2 and the apex portion of the conical portion of the hopper, and then each suspension wire is individually grounded using a crane, and the suspension wire attached to the trunnion is attached to the trunnion. Lift with a crane, lower the suspension wire attached to the apex of the cone-shaped part of the hopper, and then continue to raise further to complete the vertical raising of the call bunker. A method for raising a call bunker comprising removing a suspension wire attached to the apex and installing a bunker at a predetermined location.

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