JPH11159155A - Support device for temporary column, and demolition of boiler and boiler building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working efficiency by connecting a fixing beam to the upper end side of temporary columns erected at the peripheray of a boiler and cutting off the fixing beam from a boiler building and shortening the temporary columns stepwise and demolishing the boiler and then demolishing the building. SOLUTION: Temporary columns 3 and support devices 4 for the temporary columns are provided in the inside of a boiler building 2 and the upper end sides of the temporary columns 3 are connected to a top girder 6. Then, the girder 6 is separated from a building 2 and the temporary columns 3 are lowered by every length corresponding to the unit column 5 by letting out wires 11a, 12a with jacks 11, 12. And then, the temporary columns 3 are tentatively fixed to frame bases 10 of the support devices 4 to remove the lowermost columns of the unit columns 5 of the temporary columns 3, and column-receive members 13 are raised by the jacks 11, 12 and the wires 11a, 12a are pulled back, and the temporary columns 3 are raise to unfix from the frame bases 10 and remove one unit columns 5. And further, after a boiler 1 and a building 2 have been demolished by one stage from the upper and lower parts, the same process is repeated. In this way, the working efficiency can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for dismantling a boiler installed in, for example, a thermal power plant together with its building.

[0002]

The large hanging boiler installed in the thermal power plant is dismantled together with the building after the service life of the boiler has elapsed. Most of the work is performed at high altitudes, so dismantling is very difficult. Therefore, a method of disassembling the boiler from below while lowering the boiler little by little (for example, a dismantling method disclosed in JP-A-6-323504) has been used. More specifically, in this dismantling method, the boiler separated from the top girder is lowered stepwise using a plurality of jacks installed on the top girder suspending the boiler, and the boiler is dismantled from the lower part by the amount lowered each time. It is characterized by doing. on the other hand,
The boiler building will be dismantled from the top after the dismantling of the boiler is completed.

[0003] By the way, there has been a point that such a dismantling method needs improvement. That is, the top girder needs to be supported in its original position by the main pillar of the boiler building until the boiler is completely dismantled. For this reason, the dismantling of the boiler and the dismantling of the boiler building could not proceed at the same time. In recent years, shortening of the construction period has been strongly demanded, and development of a technology capable of performing dismantling of a boiler and dismantling of a boiler building in parallel has been awaited.

[0004] Therefore, an object of the present invention is to provide a boiler and a boiler building dismantling technique which can dismantle the boiler and the boiler building at the same time, which can improve the work efficiency and shorten the construction period. That is.

[0005]

An object of the present invention is to provide a device used for supporting a lower end side of a temporary column, and a leg, and a load receiving member provided between the legs and through which the temporary column is inserted. A stand having a beam portion, a jack provided on a load receiving beam portion of the stand, and a column receiving member connected to a suspending member extending from the jack and on which a lower end portion of the temporary column is placed. The problem is solved by a temporary column support device characterized by the following.

In this temporary column support device, a through hole is formed at two positions on the load receiving beam portion of the gantry, sandwiching the temporary column, through which a suspending member extending from the jack is inserted. Are provided at positions corresponding to the through holes of the load receiving beam portion, respectively.
The column receiving member may be configured to be connected to lower ends of two hanging members protruding from the through holes of the load receiving beam portion.

[0007] Further, the above-mentioned problems are caused by an A step of erecting temporary columns around the boiler so as to face each other with the boiler interposed therebetween, and connecting a main beam for suspending the boiler to an upper end side of the temporary columns. B process, a C process of separating the permanent beam from the boiler building, a D process of lowering the boiler together with the permanent beam by gradually shortening the temporary pillar, and A boiler and a method for dismantling a boiler building, comprising: an E step for dismantling the boiler from below, and an F step for dismantling the boiler building from above.

[0008] In particular, an object of the present invention is a method for dismantling a boiler and a boiler building using the temporary column support device,
A step G of erecting a temporary column formed by connecting a plurality of unit columns of a predetermined length around the boiler using the temporary column supporting device so as to face each other with the boiler interposed therebetween, and suspending the boiler; An H step of connecting the main beam to the upper end side of the temporary column, an I step of separating the main beam from the boiler building, and operating a jack to feed out a hanging material; J step of lowering by an amount corresponding to
K step of fixing the lowered temporary column with respect to the gantry, L step of removing the lowest unit column among the unit columns constituting the lowered temporary column, and operating the jack An M step of raising the column receiving member and bringing the column receiving member into contact with the lower end of the temporary column, and releasing the position fixing state of the temporary column with respect to the gantry, and the lower end of the temporary column is An N step of being placed on a member, an O step of dismantling the boiler lowered from the lower part together with the permanent beam as the temporary pillar descends, and a P step of dismantling the boiler building from the upper part And the above-mentioned J step, K step, L step, M step, N step, O step
The step and the step P are repeatedly performed as necessary, and the problem is solved by a method for dismantling a boiler and a boiler building.

In the method for dismantling the boiler and the boiler building, a unit column having a flange is used, and a cannula member is arranged between the flange of the unit column and the load receiving beam of the gantry. By doing so, the position of the temporary pillar can be fixed to the gantry. When connecting the temporary beam to the upper end side of the temporary pillar, the upper end surface of the temporary pillar is brought into contact with the permanent beam, and the temporary pillar and the permanent beam are joined, and the temporary pillar is connected to the temporary pillar. It is preferable that a horizontal member is used to connect the vertical beam existing at the end of the main beam to the vertical member. Thereby, the support state of the permanent beam by the temporary pillar becomes more stable.

As described above, according to the present invention, a temporary pillar is erected around the boiler so as to face each other with the boiler interposed therebetween, and a permanent beam for suspending the boiler is connected to the upper end side of the temporary pillar. After separating the main beam from the boiler building,
By gradually shortening the temporary columns, the boiler was lowered together with the main beams, and the boiler and the boiler building were dismantled. In particular, in the process of gradually shortening temporary pillars,
A leg, and a pedestal having a load receiving beam provided between the legs and through which the temporary pillar is inserted, a jack provided on the load receiving beam of the pedestal, and a suspension member extending from the jack. The work is performed using a temporary column support device including a column receiving member on which the lower end of the temporary column is placed. That is, in the present invention, during the dismantling of the boiler, the vertical load of the boiler to be disassembled is supported not by the boiler building (especially its main pillar) but by a temporary pillar. In other words, the support state of the boiler being dismantled can be obtained without depending on the boiler building at all. Therefore, it is not necessary to keep the boiler building until the boiler is completely dismantled, and the boiler building can be dismantled in parallel with the boiler dismantling work. Therefore, the work efficiency is superior to that of the related art, and the construction period required for dismantling the boiler and the boiler building can be significantly reduced. In the technology of the present invention, the temporary pillars supporting the boiler being dismantled are also removed by an amount corresponding to the amount of the descent as the boiler is lowered. Therefore, the installation of the temporary columns does not affect the construction period of the dismantling work.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A temporary column supporting device described below as an embodiment of the present invention is used for supporting a lower end side of a temporary column, and is provided with legs and between the legs. A frame having a load receiving beam portion through which the temporary column is inserted, a jack provided on the load receiving beam portion of the frame, and a hanging member extending from the jack, and a lower end portion of the temporary column is mounted. And a column receiving member. In particular, in the present embodiment, through holes are formed in the load receiving beam portion of the gantry at two positions sandwiching the temporary column to allow a hanging member extending from the jack to pass therethrough, and the jack corresponds to the through hole of the load receiving beam portion. And a column receiving member is connected to lower ends of two suspension members projecting from the through holes of the load receiving beam portion.

Also, a method of dismantling a boiler and a boiler building, which will be described below as an embodiment of the present invention, is carried out using the above-mentioned temporary column support device, and comprises a plurality of unit columns having a predetermined length. A step G of erecting the temporarily connected temporary pillars around the boiler using the temporary pillar supporting device so as to face each other with the boiler interposed therebetween, and a permanent beam for suspending the boiler is provided on the temporary pillars. H step connecting to the upper end side,
An I step of separating the main beam from the boiler building, a J step of operating a jack to draw out a hanging material, and lowering the temporary column by an amount corresponding to the length of the unit column, and a step of lowering the temporary column A K step of fixing the position of the column to the gantry, an L step of removing the lowest one of the unit columns constituting the lowered temporary column, and raising the column receiving member by operating the jack. An M step of contacting the column receiving member with the lower end of the temporary column, and releasing the position fixing state of the temporary column with respect to the gantry, and the lower end of the temporary column was placed on the column receiving member. N to state
An O step of disassembling the boiler lowered from the lower part together with the main beam with the lowering of the temporary pillar,
P step of dismantling the boiler building from above,
The method is characterized in that the steps J, K, L, M, N, O, and P are repeated as necessary. In the method for dismantling the boiler and the boiler building according to the present embodiment, a unit column having a flange formed is used, and a cannula member is disposed between the flange of the unit column and the load receiving beam of the gantry. By doing so, the position of the temporary pillar was fixed to the gantry. Further, when connecting the temporary beam to the upper end side of the temporary pillar, the upper end surface of the temporary pillar is brought into contact with the permanent beam, and the temporary pillar and the permanent beam are joined, and the temporary pillar is connected to the temporary pillar. The horizontal member is connected to the vertical member existing at the end of the main beam.

Next, an embodiment of the present invention will be described in more detail with reference to FIGS. 1 is an external view of a boiler and a boiler building showing a state in which preparations for this dismantling work have been completed, FIG. 2 is a cross-sectional view of the boiler building in the same state as FIG. 1, and FIG. FIG. 4 is a front view showing the structure of the temporary column support device, FIG. 5 is a cross-sectional view taken along line XX in FIG. 4, and FIG. FIG. 7 is a front view of the temporary column support device in a state where the temporary column support device is lowered by an amount corresponding to the height, FIG. 7 is a front view of the temporary column support device in a state where the lowered temporary column is fixed to the gantry, and FIG. FIG. 9 is a plan view of the temporary column supporting device in the same state as FIG. 7, and FIG. 9 is a front view of the temporary column supporting device in a state where the lowermost one of the unit columns constituting the temporary column is removed. FIG. 11 is a front view of the temporary column supporting device in a state where the column receiving member is raised and is brought into contact with the lower end of the temporary column.
Is a front view of the temporary column support device in a state where the position of the temporary columns with respect to the gantry has been released, FIG. 12 is a cross-sectional view of the boiler building showing a state in which the boiler is lowered by one stage, and FIG. 13 is a boiler and boiler building 14 is a cross-sectional view of the boiler building showing a state in which the dismantling of one stage is completed, and FIG. 14 is a cross-sectional view of the boiler building showing a state immediately before the boiler is finally lowered.

In the dismantling method of this embodiment, prior to the actual dismantling of the boiler 1 and the boiler building 2, as shown in FIGS. 1 and 2, the temporary pillar 3 and the temporary pillar 3 are provided inside the boiler building 2. A temporary column support device 4 for supporting the lower end side is provided. Of these, the temporary columns 3 are assembled around the boiler 1 so that a total of four temporary columns 3 are opposed to each other across the boiler 1 [G (A) step]. However, in the present embodiment, as the temporary pillar 3, a pillar formed by connecting a plurality of unit pillars 5 each having a length of about several meters as shown in FIG. 2 is used. In addition,
A flange 5a is formed at the center of the unit column 5. The role of the brim portion 5a will be described in detail later. In short, it is used when the temporary pillar 3 is temporarily fixed in position.

After the temporary pillar 3 is erected as described above, the upper end side is further connected to a top girder 6 which is a permanent beam for suspending the boiler 1 [H (B) step]. This connection state is as shown in FIG. That is, the upper end surface of the temporary pillar 3 is brought into contact with the top girder 6, and the two are joined by bolting. Then, the temporary column 3 and the vertical member 7 provided at the end of the top girder 6 are joined by a horizontal member 8. FIG. 3 shows the state after the dismantling operation has started. When the temporary pillar 3 is connected to the top girder 6, the top girder 6 is in the boiler building 2
In a state supported by the main pillar 9.

Next, the temporary column supporting device 4 for supporting the lower end of the temporary column 3 will be described. The temporary column support device 4 also
Like the temporary pillar 3, a total of four sets are provided in pairs. One of them is shown in FIG. 4 (the structure of the paired temporary column supporting device is the same as that shown in FIG. 4 and the description is omitted). As can be seen from FIG. 4, the temporary column support device 4 of the present embodiment includes a gate-shaped gantry 10, two jacks 11 and 12 set on the gantry 10, and wires (suspending) extending from the jacks 11 and 12. (Material) 11a, 12a.

Among these, the gate-shaped gantry 10 has a pair of legs 1
4a, 14b and a load receiving beam 15 provided between the legs 14a, 14b. In particular, a rectangular notch 16 is formed at the center of the load receiving beam portion 15, as can be seen from FIG. This notch 16 is for inserting the temporary column 3 and, as described above, the temporary column 3
The notch 16 is slightly larger than the brim portion 5a so as not to interfere with the brim portion 5a.

On the other hand, the jacks 11 and 12 are provided at positions sandwiching the notch 16 on the load receiving beam portion 15. Through holes (not shown) are formed at two places of the load receiving beam portion 15 sandwiching the notch 16 (or the temporary pillar 3), that is, at positions where the jacks 11 and 12 are provided. The through holes are for inserting wires 11a and 12a extending from the jacks 11 and 12, respectively. Column receiving member 13 on which the lower end of temporary column 3 is placed
Is a wire 11 protruding from the through hole of the load receiving beam 15.
a, 12a.

As described above, when the temporary column 3 is erected inside the boiler building 2 using the temporary column support device 4, and the temporary column 3 is further connected to the top girder 6, then the top Girder 6 is separated from boiler building 2 [I
(C) Step]. At this time, the cutting of the top girder 6 is performed as shown in FIG.
The measurement is performed along the vertical plane including the Q point and the vertical plane including the Q ′ point. Thereby, the temporary pillar 3 replaces the main pillar 9 of the boiler building 2 with the boiler 1 and the top girder 6.
To receive the weight of.

After the weights of the boiler 1 and the top girder 6 have been transferred to the temporary columns 3, the boiler 1 is moved together with the top girder 6 by shortening the temporary columns 3.
Lower by step (step D). This D step includes the following J to N steps. Hereinafter, the J to N steps will be described in more detail with reference to FIGS. When the work for shortening the temporary pillar 3, that is, the work for removing one unit pillar 5 constituting the temporary pillar 3, first, the jack 1 is moved from the state shown in FIG.
The wires 11a and 12a are paid out by operating the wires 1 and 12, respectively. Thus, as shown in FIG. 6, the temporary pillar 3 is lowered by an amount corresponding to the length of the unit pillar 5 (Step J).

When this is completed, the lowered temporary column 3 is temporarily fixed to the gantry 10 of the temporary column support device 4 (step K). More specifically, between the brim portion 5a of the temporary pillar 3 and the load receiving beam portion 15 of the gantry 10, FIG.
As can be seen from FIG. 8 and FIG. 8, a substantially U-shaped cannook member 17 is arranged, and a load from the temporary pillar 3 is applied to the load receiving beam portion 15. However, in practice, the gap between the brim portion 5a of the temporary column 3 lowered and the load receiving beam portion 15 is made slightly larger than the thickness of the kanuki member 17 at first. Then, the wires 11a and 12a are further extended to bring the brim portion 5a of the temporary pillar 3 into close contact with the cannula member 17 (in this state, no load acts on the pillar receiving member 13).

When the temporary column 3 is fixed in position with respect to the gantry 10 of the temporary column support device 4 in this manner, subsequently, as shown in FIG. Remove the positioned object (L step). After the temporary pillar 3 is shortened by the length of the unit pillar 5 by the L process, the jacks 11 and 12 are operated, and the pillar receiving member 13 is operated.
To rise. Then, as shown in FIG.
The column receiving member 13 is brought into contact with the lower end of the M (step M).

When the column receiving member 13 comes into contact with the lower end of the temporary column 3, the jacks 11 and 12 are further operated to pull back the wires 11a and 12a, and the temporary column 3 is slightly moved from the position shown in FIG. To raise. That is, the kanuki member 1
A gap is formed between 7 and the brim portion 5a of the temporary pillar 3. Thereafter, the cannus member 17 is pulled out, and as shown in FIG. 11, the fixed state of the temporary pillar 3 with respect to the gantry 10 is released. Then, again, the lower end of the temporary pillar 3 is
(N step). When this N step is completed, the state of supporting the temporary pillar 3 by the temporary pillar support device 4 returns to the initial state shown in FIG.

After the above steps J to N, as shown in FIG. 12, when the boiler 1 is lowered by one stage together with the top garter 6, the boiler 1 is disassembled from below (O (E) step). At the same time, the boiler building 2 is dismantled from above (P (F) step). Boiler 1 and boiler building 2
FIG. 13 shows a state in which the disassembly of one step has been completed for one stage.

Thereafter, the above steps J to P may be repeated. From the situation shown in FIG.
The state repeated twice is as shown in FIG. FIG.
FIG. 4 shows the state immediately before the boiler 1 and the top garter 6 are finally lowered. Therefore, the above steps J to P are repeated once more from the state shown in FIG. And
The dismantling of the boiler and the boiler building is completed by processing the remaining portion by an appropriate method.

As described above, in the present embodiment, the temporary columns 3 are arranged around the boiler 1 so as to face each other with the boiler 1 interposed therebetween.
And the top girder 6 for suspending the boiler 1 is connected to the upper end side of the temporary pillar 3, and after the top girder 6 is separated from the boiler building 2, the temporary pillar 3 is gradually shortened. Then, the boiler 1 is lowered together with the top girder 6, and the boiler 1 and the boiler building 2 are dismantled. In particular, the temporary column support device 4 is used to shorten the temporary column 3 stepwise. That is, in the present embodiment, the boiler 1 to be dismantled is supported not by the main pillar 9 of the boiler building 2 but by the temporary pillar 3. In other words, the support state of the boiler 1 during dismantling is changed to the boiler building 2
(Especially, the main pillar 9) can be obtained without depending at all. Therefore, it is not necessary to keep the boiler building 2 until the dismantling of the boiler 1 is completed, and the dismantling work of the boiler building 2 can be performed in parallel with the dismantling work of the boiler 1. Therefore, the work efficiency is excellent, and the construction period required for dismantling the boiler 1 and the boiler building 2 is greatly reduced.
In addition, in the present embodiment, as for the temporary pillar 3 supporting the boiler 1 being dismantled, a portion corresponding to the descending amount is removed as the boiler 1 descends. For this reason, the installation of the temporary columns 3 does not affect the construction period of the dismantling work.

[0027]

According to the present invention, the boiler and the boiler building can be dismantled at the same time, the work efficiency can be improved, and the construction period can be greatly reduced as compared with the prior art.

[Brief description of the drawings]

FIG. 1 is an external view of a boiler and a boiler building showing a state in which preparations for this dismantling work are completed.

FIG. 2 is a cross-sectional view of a boiler building in a state where preparations for the dismantling work are completed.

FIG. 3 is an enlarged view of a connecting portion between a temporary pillar and a permanent beam (top girder).

FIG. 4 is a front view showing the structure of a temporary column support device.

FIG. 5 is a sectional view taken along line XX in FIG. 4;

FIG. 6 is a front view of the temporary column supporting device in a state where the temporary column is lowered by an amount corresponding to the length of the unit column.

FIG. 7 is a front view of the temporary column supporting device in a state where the lowered temporary column is fixed in position with respect to the gantry;

FIG. 8 is a plan view of the temporary column supporting device in a state where the lowered temporary column is fixed to the gantry.

FIG. 9 is a front view of the temporary column support device in a state where a lowermost one of the unit columns constituting the temporary column is removed.

FIG. 10 is a front view of the temporary column supporting device in a state where the column receiving member is raised and brought into contact with the lower end of the temporary column.

FIG. 11 is a front view of the temporary column support device in a state where the position of the temporary column with respect to the gantry is fixed.

FIG. 12 is a cross-sectional view of the boiler building showing a state where the boiler is lowered by one stage.

FIG. 13 is a cross-sectional view of the boiler building showing a state in which the dismantling of the boiler and the boiler building has been completed for one stage.

FIG. 14 is a sectional view of the boiler building showing a state immediately before the boiler is finally lowered.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boiler 2 Boiler building 3 Temporary column 4 Temporary column support device 5 Unit column 5a Collar part 6 Top girder (main beam) 7 Vertical member 8 Horizontal member 9 Main column 10 Stand 11, 12 Jack 11a, 12a Wire (hanging member) 13) Column receiving member 14a, 14b Leg 15 Load receiving beam 16 Notch 17 Kannuki member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Tsuchiya 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Eisai Kobashi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Hirotoshi Ikeda 1-25-1 Nishi Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Toshishi Soka 1-25-1 Nishi Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd.

Claims (6)

[Claims] 1. A device used for supporting a lower end side of a temporary column, comprising: a pedestal having a leg portion and a load receiving beam portion provided between the leg portion and through which the temporary column is inserted. A temporary column comprising: a jack provided on a load receiving beam portion of a gantry; and a column receiving member connected to a suspending member extending from the jack and on which a lower end portion of the temporary column is placed. Support device. 2. A load receiving beam portion of a gantry is provided with through holes for inserting a suspension extending from a jack at two positions sandwiching the temporary pillar, and the jack is provided with the load receiving beam. And the column receiving member is connected to the lower ends of two suspension members projecting from the through holes of the load receiving beam portion. The temporary column support device according to claim 1. A step of erecting temporary columns around the boiler so as to face each other with the boiler interposed therebetween; and a step B of connecting a permanent beam for suspending the boiler to an upper end side of the temporary columns. A step C for separating the permanent beam from the boiler building; a step D for lowering the boiler together with the permanent beam by gradually shortening the temporary pillar; and disassembling the lowered boiler from below. A boiler and a method for dismantling a boiler building, comprising: an E step for performing a boiler building operation; 4. A method for dismantling a boiler and a boiler building using the temporary column support device according to claim 1 or 2, wherein a temporary column formed by connecting a plurality of unit columns having a predetermined length is used. A G step of erecting the periphery of the boiler using the temporary column supporting device so as to face each other with the boiler interposed therebetween; and an H step of connecting a main beam for suspending the boiler to an upper end side of the temporary column. An I step of separating the main beam from the boiler building; a J step of operating a jack to draw out a hanging material; and lowering the temporary column by an amount corresponding to the length of the unit column. A K step of fixing the position of the column with respect to the gantry; an L step of removing the lowest unit column of the unit columns constituting the lowered temporary column; and operating the jack to raise the column receiving member. And the lower end of the temporary pillar Wherein the M step of abutting the pole receiving member, to release the position fixing condition with respect to the frame of the temporary columns to,
An N step in which a lower end portion of the temporary column is placed on the column receiving member; and an O step of disassembling the boiler lowered together with the main beam from below, with the temporary column lowered, And a P step of dismantling the boiler building from above, wherein the J step, the K step, the L step, the M step, the N step, the O step, and the P step are repeatedly performed as necessary. And how to dismantle the boiler building. 5. A temporary column is provided on the base by using a unit column having a flange formed thereon and disposing a cannula member between the flange of the unit column and the load receiving beam of the base. The method for dismantling a boiler and a boiler building according to claim 4, wherein the position of the boiler and the boiler building are fixed. 6. When connecting a temporary beam to an upper end side of a temporary pillar, an upper end surface of the temporary pillar is brought into contact with the permanent beam, and the temporary pillar and the permanent beam are joined. The method for dismantling a boiler and a boiler building according to any one of claims 3 to 5, wherein the temporary pillar and a vertical member existing at an end of the main beam are fastened by a horizontal member.