Method for dismantling support in concrete cylinder silo

Abstract

The invention discloses a method for dismantling a support in a concrete cylinder silo. A hole is reserved in a conical shell right above a horizontal support, a first winch is arranged at a bottom platform in the silo, a second winch is arranged at a reserved hole in the top of the silo, a third pulley is fixed to the side face of the lower end of a center stand column on the bottom platform in the concrete cylinder silo, and a truss girder dismantling tool is adopted. According to the method, the specially designed tool is adopted, the hole reserved in the top of the silo is used for installing the pulley block, the winch is matched for dismantling the support in the concrete cylinder silo, dismantling of the support in the narrow space is achieved, the construction difficulty is small, and the dismantling speed of the support is increased.

Description

Technical Field

[0001] The invention relates to a method for removing a bracket inside a concrete cylindrical silo and belongs to the technical field of building construction. Background Art

[0002] Concrete silos are warehouses for storing bulk materials. The plane shape of silos is mostly circular, the height of silos varies from 20 to 60m, and the top is a cone shell structure. The coal storage bunker of Zouping Railway Dedicated Line Freight Yard adopts a 30m diameter concrete cylindrical silo, and the silo roof is constructed with a cone shell structure. The height of the cone shell structure at the top of the silo is 35.5m from the bottom of the silo. The support of the concrete cylindrical silo includes a central column, a steel ring beam platform set on the central column, 54 truss beams connected between the steel ring beam platform and the silo wall, and multiple horizontal supports. The central column is composed of several sections of steel pipe columns connected by flanges, and each has three horizontal supports. After the construction of the concrete cylindrical silo is completed, the construction support inside the cylindrical silo needs to be removed. After the construction of the concrete cylindrical silo was completed, the bottom was a concrete frame structure with no specially reserved exit for construction components. Only a 7.7m diameter opening was reserved at the top, and multiple rectangular concrete frames were set in the middle of the opening. It was difficult to dismantle 54 steel truss beams, steel ring beam platforms and central columns in the narrow space, and large-scale lifting equipment could not play a role. In addition, since the length of a single steel truss beam was 13.3m and the height was 1.0m, it could not be directly lifted out from the reserved hole on the top of the silo by lifting equipment. Summary of the invention

[0003] In view of the above-mentioned defects existing in the prior art, the present invention provides a method for removing the inner bracket of a concrete cylindrical silo, which can reduce the construction difficulty and improve the removal speed.

[0004] A method for dismantling a support in a concrete cylindrical silo, the support comprising a central column, a steel ring beam platform, a plurality of truss beams, and a plurality of horizontal supports, the central column being located at the center of the concrete cylindrical silo, the central column being formed by connecting a plurality of steel pipe columns through flanges, the steel ring beam platform being fixedly connected to the top of the central column, a plurality of truss beams being circumferentially arranged between the steel ring beam platform and the cylindrical silo wall, one end of the truss beam being connected to the steel ring beam platform, the other end of the truss beam being connected to the embedded part in the cylindrical silo wall, and the horizontal supports being arranged along the height direction. At least one horizontal support is arranged, each of which has three horizontal supports, one end of the horizontal support is connected to the central column, and the other end of the horizontal support is connected to the embedded part in the silo wall of the cylindrical silo. A hole is reserved on the top of the concrete cylindrical silo facing the central column. The method is characterized in that: a hole is reserved on the cone shell directly above the horizontal support, a first winch is arranged at the bottom platform in the silo, a second winch is arranged at the reserved hole on the silo top, and a third pulley is fixed on the side of the lower end of the central column on the bottom platform in the concrete cylindrical silo, including the following steps:

[0005] (i) Truss beam removal: When removing the truss beam, a truss beam removal tool is used, and the truss beam removal tool includes a main mast, a secondary mast, and a fall chain. A first pin shaft coaxial with the main mast is fixed to the top end, and a second pin shaft coaxial with the main mast is fixed to the bottom end. Lifting ears are welded to the upper ends of the main mast and the secondary mast, and the lower end of the secondary mast is hingedly connected to the lower end of the main mast. One end of the fall chain is connected to the lower part of the main mast, and the other end of the fall chain passes around the lifting ear at the upper end of the main mast and is connected to the lifting ear at the upper end of the secondary mast to form a stable bracket. A first pulley is provided at the lower end of the main mast, and a second pulley is provided at the upper end of the secondary mast. The specific steps are as follows:

[0006] ①Install the truss beam removal tooling: insert the first pin shaft at the top of the main mast of the truss beam removal tooling into the socket hole set at the center of the warehouse roof platform plate, insert the second pin shaft at the bottom of the main mast into the tooling base set at the center of the steel ring beam platform, then pull up the secondary mast with a fall chain and connect the main mast and the lower part of the secondary mast, then connect the fall chain and use the fall chain to pull the secondary mast to a fixed angle;

[0007] ②The wire rope of the first winch passes through the third pulley and the first pulley in sequence and then hangs down from the second pulley;

[0008] ③ Use the wire rope of the first hoist to hang the middle of the truss beam, use the cutting tool to cut the ring support between the truss beams, then cut the connection between the truss beam and the embedded parts of the warehouse wall, and finally cut the connection between the truss beam and the ring beam platform;

[0009] ④ Use the second winch to rotate the truss beam removal tooling so that the truss beam suspended by the truss beam removal tooling avoids the horizontal support below, and then use the first winch to slowly lower the truss beam to the bottom platform just below the warehouse roof opening;

[0010] ⑤Use the above method to dismantle the remaining truss beams in turn;

[0011] ⑥ Use the tower crane to lift the dismantled truss beam to the designated location through the reserved hole on the silo roof;

[0012] (II) Removal of steel ring beam platform, horizontal support and central column: The specific steps are as follows:

[0013] ① Install the fourth pulley at the reserved hole on the silo roof above the central column, and install the fifth pulley on the conical shell wall on the upper part of the cylindrical silo; remove the wire rope of the first hoist at the truss beam removal tooling and pass it through the fourth pulley at the reserved hole on the silo roof;

[0014] ② Remove the truss beam removal tooling, hoist the removed truss beam removal tooling by the second winch, and use the first winch to pull the truss beam removal tooling to the bottom platform;

[0015] ③ First, dismantle the steel ring beam platform: the second winch hoists the steel ring beam platform, removes the bolts on the lower flange, and the wire rope of the first winch passes through the third pulley, the fourth pulley, and the fifth pulley in turn to connect to the steel ring beam platform. Lift the steel ring beam platform 20cm, pull it away from the lower flange through the first winch, and then lift the steel ring beam platform to the bottom platform for disassembly, and then use the tower crane to lift it to the designated location through the reserved hole on the warehouse roof;

[0016] ④ The second winch hoists the topmost center column, removes the bolts on the lower flange, connects the wire rope of the first winch to the flange below the center column, hoists the center column 20cm, pulls it away from the flange below with the first winch, and then hoists the center column to the bottom platform, and then hoists it to the designated location through the reserved hole on the top of the silo using a tower crane;

[0017] ⑤ After removing the two central columns below in sequence, remove the horizontal support: set a pulley at the reserved hole on the cone shell just above the horizontal support, pass the wire rope of the first hoist through the pulley, hang the horizontal support, first remove the connection between the horizontal support and the silo wall, then remove the connection between the horizontal support and the central column, drop the removed horizontal support to the bottom platform, and then remove the remaining horizontal supports in sequence; use a tower crane to lift the removed horizontal support to the designated location through the reserved hole on the silo roof;

[0018] ⑥ Use the same method to remove the remaining steel columns and horizontal supports one by one.

[0019] Furthermore, when the truss beam is removed, a traction rope is arranged on the truss beam to prevent the truss beam from rotating.

[0020] Furthermore, the main mast and sub-mast of the truss beam dismantling tooling are both made of φ159×6 seamless steel pipes, the height of the main mast is 7m, and the length of the sub-mast is 9.6m.

[0021] The beneficial effects of the present invention are as follows: the present invention utilizes specially designed tooling and a reserved hole in the silo roof to install a pulley block, and adopts a winch to cooperate with the removal of the bracket in the concrete cylindrical silo, thereby realizing the removal of the bracket in a narrow space, and the construction difficulty is small, and the removal speed can be improved. The truss beam removal tooling in the present invention has a simple structure, convenient processing and manufacturing, light weight, easy installation and fixing, easy assembly and removal, suitable for operation in a narrow space, and safe and reliable to use, and the removal tooling can be used repeatedly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the bracket in the concrete silo;

[0023] Figure 2 yes Figure 1 A top view schematic diagram of

[0024] Figure 3 It is a plan view of the horizontal supports in a concrete silo;

[0025] Figure 4 This is a top view of the steel ring beam platform;

[0026] Figure 5 It is a structural schematic diagram of the truss beam removal tool in the present invention;

[0027] Figure 6 yes Figure 5 An enlarged schematic diagram of part A in FIG.

[0028] Figure 7 is a schematic diagram of the removal of the truss beam in the present invention;

[0029] Figure 8 It is a schematic diagram of the dismantling of the steel ring beam platform and the central column in the present invention;

[0030] In the figure, 1, concrete silo, 2, center column, 3, truss beam, 4, steel ring beam platform, 5, horizontal support rod, 6, ring support, 7, truss beam removal tooling, 8, tooling base, 9, silo roof reserved hole, 10, first winch, 11, bottom platform of silo, 12, third pulley, 13, steel wire rope of first winch, 14, second winch, 15, fourth pulley, 16, fifth pulley;

[0031] 7-1, main mast, 7-2, secondary mast, 7-3, fall chain, 7-4, first pulley, 7-5, second pulley, 7-6, lifting lug at the upper end of main mast, 7-7, lifting lug at the upper end of secondary mast, 7-8, first pin, 7-9, second pin, 7-10, hinged plate. DETAILED DESCRIPTION

[0032] The present invention will be further described below by way of non-limiting embodiments and in conjunction with the accompanying drawings:

[0033] The present invention is described in detail below by taking the coal storage bunker in the freight yard of Zouping Railway Special Line as an example. The coal storage bunker is a concrete cylindrical bunker with a diameter of 30m, and the bunker top is a cone shell structure, and the bunker top cone shell structure is 35.5m high from the bunker bottom. After the construction of the concrete cylindrical bunker is completed, the bottom is a concrete frame structure, and a 7.7m diameter hole is reserved at the top, and multiple rectangular concrete frames are set in the middle of the hole. The support of the concrete cylindrical silo includes a central column 2, a steel ring beam platform 4 arranged on the central column 2, 54 truss beams 3 connected between the steel ring beam platform 4 and the silo wall, and multiple horizontal supports 5. The central column 2 is located at the center of the concrete cylindrical silo. The central column 2 is formed by several sections of steel pipe columns connected by flanges. The steel ring beam platform 4 is connected to the top of the central column by bolts. One end of the truss beam 3 is connected to the steel ring beam platform 4, and the other end is connected to the embedded parts in the silo wall. The truss beams 3 are connected by annular supports 6. Each horizontal support has three horizontal support rods 6. One end of the horizontal support rod is connected to the central column 2, and the other end is connected to the embedded parts in the silo wall. After the construction of the concrete cylindrical silo is completed, the support in the silo needs to be removed.

[0034] Construction preparation: In addition to the reserved hole on the roof of the concrete cylindrical silo, a hole is also reserved on the cone shell directly above the horizontal support. A first winch 10 is set at the bottom platform 11 in the silo, and a second winch 14 is set at the reserved hole on the roof. A third pulley 12 is fixed to the side of the lower end of the central column 2 on the bottom platform 11 in the concrete cylindrical silo.

[0035] When dismantling the truss beam, the truss beam dismantling tool 7 is used. The truss beam dismantling tool 7 includes the main mast 7-1, the secondary mast 7-2, and the fall chain 7-3. The main mast 7-1 and the secondary mast 7-2 are both made of φ159×6 seamless steel pipes. The height of the main mast is 7m, the length of the secondary mast is 9.6m, and the ends of the steel pipes are sealed with 20mm thick steel plates. The top of the main mast is welded with a first pin 7-8 coaxial with it. The first pin 7-8 is made of φ60 round steel and has a length of 300mm. The bottom end of the main mast 7-1 is welded with a second pin 7-9 coaxial with it. The second pin 7-9 is made of φ60 round steel and has a height of 150mm. The upper end of the main mast 7-1 is welded with a lifting lug 7-6, and the upper end of the secondary mast 2 is welded with a lifting lug 7-7. The lifting lugs are all made of δ20 steel plates. The lower end of the secondary mast 7-2 is connected to the lower end of the main mast 7-1 by a hinge plate 7-10 fixed to the lower end of the main mast 7-1. The fall chain 7-3 adopts a 3T fall chain. One end of the fall chain 7-3 is connected to the lower part of the main mast 7-1. The other end of the fall chain 7-3 passes through the lifting lug at the upper end of the main mast 7-1 and is connected to the lifting lug at the upper end of the secondary mast 7-2 and tied to form a stable bracket. The lower end of the main mast 7-1 is connected to a first pulley 7-4, and the upper end of the secondary mast 7-2 is connected to a second pulley 7-5. A tooling base 8 is fixedly set at the center of the steel ring beam platform 4. The tooling base 8 adopts a DN76 steel pipe with a height of 200mm. The steel pipe is welded at the center of the steel ring beam platform 4. The tooling base 8 is used to be connected with the second pin 7-9 at the bottom end of the main mast 7-1 by a socket connection to form a rotatable mast base. A socket hole is reserved at the center of the roof platform plate in the reserved hole of the concrete cylindrical silo, and the socket hole is used for inserting the first pin shaft 7-8 at the top end of the main mast 7-1.

[0036] Construction process: Construction preparation → Truss beam removal → Steel ring beam platform removal → Steel column removal.

[0037] The steps include:

[0038] (a) Truss beam removal:

[0039] ① Install the truss beam removal tool: insert the first pin shaft 7-8 at the top of the main mast 7-1 of the truss beam removal tool 7 into the socket hole set at the center of the warehouse roof platform plate, insert the second pin shaft 7-9 at the bottom of the main mast 7-1 into the tool base 8 set at the center of the steel ring beam platform 4, then pull up the secondary mast 7-2 with the fall chain 7-3 and connect the main mast 7-1 and the lower part of the secondary mast 7-2, then connect the fall chain and use the fall chain to pull the secondary mast 7-2 to a fixed angle;

[0040] ② The steel wire rope 13 of the first hoist 10 passes through the third pulley 12 and the first pulley 7-4 in sequence and then hangs down from the second pulley 7-5;

[0041] ③ Use the wire rope of the first hoist 10 to hang the middle of the truss beam, use a cutting tool to cut the annular support between the truss beams, then cut the connection between the truss beam and the embedded parts of the warehouse wall, and finally cut the connection between the truss beam and the ring beam platform;

[0042] ④ Use the second winch 14 to rotate the truss beam removal tool 7 so that the truss beam suspended by the truss beam removal tool 7 avoids the horizontal support below, and then use the first winch 10 to slowly lower the truss beam to the bottom platform 11 just below the warehouse roof opening; in order to prevent the truss beam from rotating, a traction rope can be tied to the truss beam to prevent the truss beam from rotating;

[0043] ⑤Use the above method to dismantle the remaining truss beams in turn;

[0044] ⑥ Use the tower crane to lift the dismantled truss beam to the designated location through the reserved hole on the silo roof;

[0045] (II) Removal of steel ring beam platform, horizontal support and central column: The specific steps are as follows:

[0046] ① Install the fourth pulley 15 at the reserved hole on the silo roof above the central column, and install the fifth pulley 16 on the conical shell wall at the upper part of the cylindrical silo; remove the wire rope of the first hoist 10 at the truss beam removal tool 7 and pass it through the fourth pulley 15 at the reserved hole on the silo roof;

[0047] ② Remove the truss beam removal tool 7, hoist the removed truss beam removal tool 7 by the second hoist 14, and use the first hoist 10 to pull the truss beam removal tool 7 to the bottom platform 11;

[0048] ③ First, dismantle the steel ring beam platform: the second hoist 14 hoists the steel ring beam platform 4, removes the bolts on the lower flange, and the steel wire rope of the first hoist 10 passes through the third pulley 12, the fourth pulley 15, and the fifth pulley 16 in sequence to connect to the steel ring beam platform, and hoists the steel ring beam platform by 20 cm, and pulls it to offset the lower flange through the first hoist 10, and then hoists the steel ring beam platform to the bottom platform 11 for disassembly, and then hoists it to the designated location through the reserved hole on the warehouse roof using a tower crane;

[0049] ④ The second hoist 14 hoists the topmost center column, removes the bolts on the lower flange, connects the wire rope of the first hoist 10 to the flange below the center column, hoists the center column by 20 cm, pulls it away from the flange below, and then hoists the center column to the bottom platform 11, and then hoists it to the designated location through the reserved hole on the top of the warehouse using a tower crane;

[0050] ⑤ After removing the two central columns below in sequence, remove the horizontal support: set a pulley at the reserved hole on the cone shell just above the horizontal support, pass the wire rope of the first hoist 10 through the pulley, hang the horizontal support, first remove the connection between the horizontal support and the warehouse wall, then remove the connection between the horizontal support and the central column, drop the removed horizontal support onto the bottom platform 11, and then remove the remaining horizontal supports in sequence; use a tower crane to lift the removed horizontal support to the designated location through the reserved hole on the warehouse roof;

[0051] ⑥ Use the same method to remove the remaining steel columns and horizontal supports one by one.

[0052] The present invention utilizes specially designed tooling and a reserved hole on the silo roof to install a pulley block, and adopts a winch to cooperate with the removal of the bracket in the concrete cylindrical silo, thereby realizing the removal of the bracket in a narrow space, reducing the construction difficulty and increasing the removal speed.

[0053] The other parts of this embodiment are all prior art and will not be described in detail here.

Claims

1. A method for removing a support in a concrete cylindrical silo, the support comprising a central column, a steel ring beam platform, a plurality of truss beams, and a plurality of horizontal supports, the central column being located at the center of the concrete cylindrical silo, the central column being formed by connecting a plurality of steel pipe columns through flanges, the steel ring beam platform being fixedly connected to the top of the central column, a plurality of truss beams being circumferentially arranged between the steel ring beam platform and the cylindrical silo wall, one end of the truss beam being connected to the steel ring beam platform, the other end of the truss beam being connected to an embedded part in the cylindrical silo wall, at least one horizontal support being arranged along the height direction, each having three horizontal supports, one end of the horizontal support being connected to the central column, the other end of the horizontal support being connected to an embedded part in the cylindrical silo wall, an opening being reserved on the top of the concrete cylindrical silo facing the central column, and characterized in that: A hole is reserved on the cone shell just above the horizontal support, a first winch is arranged at the bottom platform in the silo, a second winch is arranged at the reserved hole on the silo top, and a third pulley is fixed on the side of the lower end of the central column on the bottom platform in the concrete cylindrical silo, including the following steps: (i) Truss beam removal: When removing the truss beam, a truss beam removal tool is used, and the truss beam removal tool includes a main mast, a secondary mast, and a fall chain. A first pin shaft coaxial with the main mast is fixed to the top end, and a second pin shaft coaxial with the main mast is fixed to the bottom end. Lifting ears are welded to the upper ends of the main mast and the secondary mast, and the lower end of the secondary mast is hingedly connected to the lower end of the main mast. One end of the fall chain is connected to the lower part of the main mast, and the other end of the fall chain passes around the lifting ear at the upper end of the main mast and is connected to the lifting ear at the upper end of the secondary mast to form a stable bracket. A first pulley is provided at the lower end of the main mast, and a second pulley is provided at the upper end of the secondary mast. The specific steps are as follows: ①Install the truss beam removal tooling: insert the first pin shaft at the top of the main mast of the truss beam removal tooling into the socket hole set at the center of the warehouse roof platform plate, insert the second pin shaft at the bottom of the main mast into the tooling base set at the center of the steel ring beam platform, then pull up the secondary mast with a fall chain and connect the main mast and the lower part of the secondary mast, then connect the fall chain and use the fall chain to pull the secondary mast to a fixed angle; ②The wire rope of the first winch passes through the third pulley and the first pulley in sequence and then hangs down from the second pulley; ③ Use the wire rope of the first hoist to hang the middle of the truss beam, use the cutting tool to cut the ring support between the truss beams, then cut the connection between the truss beam and the embedded parts of the warehouse wall, and finally cut the connection between the truss beam and the ring beam platform; ④ Use the second winch to rotate the truss beam removal tooling so that the truss beam suspended by the truss beam removal tooling avoids the horizontal support below, and then use the first winch to slowly lower the truss beam to the bottom platform just below the warehouse roof opening; ⑤Use the above method to dismantle the remaining truss beams in turn; ⑥ Use the tower crane to lift the dismantled truss beam to the designated location through the reserved hole on the silo roof; (II) Removal of steel ring beam platform, horizontal support and central column: The specific steps are as follows: ① Install the fourth pulley at the reserved hole on the silo roof above the central column, and install the fifth pulley on the conical shell wall on the upper part of the cylindrical silo; remove the wire rope of the first hoist at the truss beam removal tooling and pass it through the fourth pulley at the reserved hole on the silo roof; ② Remove the truss beam removal tooling, hoist the removed truss beam removal tooling by the second winch, and use the first winch to pull the truss beam removal tooling to the bottom platform; ③ First, dismantle the steel ring beam platform: the second winch hoists the steel ring beam platform, removes the bolts on the lower flange, and the wire rope of the first winch passes through the third pulley, the fourth pulley, and the fifth pulley in turn to connect to the steel ring beam platform. Lift the steel ring beam platform 20cm, pull it away from the lower flange through the first winch, and then lift the steel ring beam platform to the bottom platform for disassembly, and then use the tower crane to lift it to the designated location through the reserved hole on the warehouse roof; ④ The second winch hoists the topmost center column, removes the bolts on the lower flange, connects the wire rope of the first winch to the flange below the center column, hoists the center column 20cm, pulls it away from the flange below with the first winch, and then hoists the center column to the bottom platform, and then hoists it to the designated location through the reserved hole on the top of the silo using a tower crane; ⑤ After removing the two central columns below in sequence, remove the horizontal support: set a pulley at the reserved hole on the cone shell just above the horizontal support, pass the wire rope of the first hoist through the pulley, hang the horizontal support, first remove the connection between the horizontal support and the silo wall, then remove the connection between the horizontal support and the central column, drop the removed horizontal support to the bottom platform, and then remove the remaining horizontal supports in sequence; use a tower crane to lift the removed horizontal support to the designated location through the reserved hole on the silo roof; ⑥ Use the same method to remove the remaining steel columns and horizontal supports one by one.

2. The method for removing the inner support of a concrete silo according to claim 1 is characterized by: When dismantling the truss beam, a traction rope is set on the truss beam to prevent the truss beam from rotating.

3. The method for removing the inner support of a concrete silo according to claim 1 or 2, characterized in that: The main mast and sub-mast of the truss beam dismantling tooling are both made of φ159×6 seamless steel pipes. The height of the main mast is 7m and the length of the sub-mast is 9.6m.

Images