Silo roof construction method using central column and Bailey beam support system

Abstract

The invention discloses a silo roof construction method using a central column and a Bailey beam support system, which relates to the technical field of building construction, and has the advantages that a steel truss support system does not rise along with a sliding formwork system, the initial strength requirement for silo wall concrete is reduced, and the construction speed is accelerated. The main points of the technical scheme are: S1: presetting a central column, S2: sliding formwork to the top, S3: setting an external platform, S4: removing the sliding formwork system, S5: connecting the central column, S6: installing Bailey beams, S7: laying annular purlins, S8: laying anti-falling nets, S9: erecting a steel pipe support frame, S10: installing a silo roof formwork, S11: installing steel bars on the silo roof, S12: pouring silo roof concrete, and S13: removing the Bailey beam and the central column.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a silo roof construction method using a central column and Bailey beam support system. Background Art

[0002] Silos are widely used in coal, electricity, mining, grain storage and other industries due to their large storage capacity and low operation and maintenance costs. The supporting construction technology is also constantly being improved and updated. The traditional silo roof formwork structure construction method is to complete the silo foundation (silo bottom structure and funnel layer) → install the slipform system → install the silo roof steel truss support system (installed as a whole at the top of the funnel) → lay the anti-fall net → follow the slipform to the top → align and adjust with the corbel → install the silo roof formwork → install the silo roof steel bars → pour the silo roof concrete → remove the steel truss support system.

[0003] However, during the above construction process, the steel truss support system is heavy and rises with the slipform system. The slipform system is used for the casting construction of the silo wall. Therefore, the initial strength of the silo wall concrete is required to be high and the construction speed is slow. Therefore, the applicant has developed a new technical solution in the actual production process to solve the above technical problems. Summary of the invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a silo roof construction method using a central column and Bailey beam support system, which has the advantages of preventing the steel truss support system from rising along with the slipform system, reducing the initial strength requirements for the silo wall concrete, and accelerating the construction speed.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a silo roof construction method using a central column and Bailey beam support system, comprising the following steps:

[0007] S1: Preset center column. The center column is connected by bolts of several steel columns. First, find the center of the silo on the foundation surface below the silo, mark the position of the lowest steel column of the center column, and pop it out with an ink line;

[0008] S2: Slipform to the top, use the slipform to construct the silo wall, and pre-embed several brackets on the inner wall of the upper silo wall;

[0009] S3: Setting up the external platform; S4: Dismantling the slipform system;

[0010] S5: Center column height connection: Use a tower crane to hoist in standard steel column sections, and bolt them section by section. At the same time, install the scaffolding synchronously to provide a steel column installation operation surface. The steel column at the lower end of the center column is provided with a steel pad fixed on the foundation surface. Flange plates are provided at both ends of each steel column for bolt connection. The center column passes through the funnel layer of the silo, and the diameter of the steel column passing through the funnel layer is smaller than the diameter of other steel columns. A tray is provided on the outer wall of the steel column at the uppermost end of the center column, and a circular mushroom tray formed by splicing four arc-shaped plates is provided on the upper end of the tray;

[0011] S6: Bailey beam installation: use a tower crane to lift each Bailey beam into the silo and fix one end to the corbel and the other end to the mushroom plate. Two adjacent Bailey beams are connected and reinforced with steel pipe fasteners;

[0012] S7: laying of ring purlins, laying of ring purlins on Bailey beams;

[0013] S8: laying of anti-fall net;

[0014] S9: The steel pipe support frame is erected, using a steel pipe full-frame frame, radial arrangement, and shape finding according to the cone shell slope;

[0015] S10: Install the silo roof formwork, install the silo roof formwork on the steel pipe support frame;

[0016] S11: Installation of silo roof reinforcement: laying the silo roof reinforcement on the silo roof formwork;

[0017] S12: Concrete pouring of silo roof, after the silo roof is poured and formed, reserved hoisting holes and Bailey beam lowering holes are formed;

[0018] S13: Bailey beam and center column removal.

[0019] By adopting the above technical scheme, when the silo wall is constructed by the slipform system, the Bailey beam is not raised. After the silo wall construction is completed, the center column is installed first, and then the Bailey beam is hoisted into the silo for fixing. This has the advantages of preventing the Bailey beam from rising with the slipform system, reducing the initial strength requirements for the silo wall concrete, and accelerating the construction speed. After the silo top is cast and formed, the Bailey beam and the center column are removed through the reserved hoisting holes and the Bailey beam lowering holes; the center of the silo is positioned by the center column to reduce the deviation of the silo center, and the support of the center column to the Bailey beam improves the overall stability.

[0020] Preferably, the above S3: an external platform is provided, specifically, a cantilever beam is connected to the pre-buried dowel in the silo wall with bolts, the cantilever beam is 1200 mm long, the spacing is 1337 mm, and a total of 60 positions are provided along the outer wall of the silo; a frame is set up on the cantilever to support the annular gutter at the lower edge of the silo roof;

[0021] Preferably, the lowering holes are located above the two ends of each Bailey beam in the length direction. In step S13, the Bailey beam removal includes placing two winches 1 on the outer wall of the silo roof. The two winches 1 are distributed beside the lowering holes at the two ends of a Bailey beam. After the winches 1 lower the Bailey beams one by one to the bottom plate of the silo, they are disassembled in sequence and transported to the outside of the silo from the reserved lifting holes on the silo roof.

[0022] The removal of the center column in S13 includes the removal of the steel column after all the Bailey beams are removed. A portal steel frame is set at the grain inlet in the middle of the silo roof. A second winch is installed on the portal steel frame. The second winch is used to lift and tighten the top section of the steel column. The bolt connection points of the top two sections of the steel column are then removed. The steel column is lifted to the bottom plate of the silo and transported to the outside of the silo through the reserved lifting holes on the silo roof. All steel columns are removed step by step from top to bottom. At the same time, the scaffolding around the steel columns is removed along with the removal of the steel columns.

[0023] Preferably, the position of the second winch is staggered with the center line of the steel column, and an adjustment member is provided on the gantry steel frame, and the adjustment member enables the lifted steel column to be located on one side of the center column after the second winch lifts the steel column.

[0024] Preferably, two opposite connecting plates are welded to the upper end surfaces of the corbel and the mushroom plate, and both ends of each of the Bailey beams are clamped on the opposite sides of the two connecting plates. Pins are inserted into the two connecting plates, and both ends of the pins pass through and extend out of the Bailey beam and a locking hole is opened in the extended outer wall. The length of the locking hole is perpendicular to the length of the pin, and a locking rod with pins extending from both ends is threadedly connected to the locking hole.

[0025] Preferably, in step S5, the upper end surface of the steel column at the uppermost end of the central column is provided with a disc flush with the upper end surface of the mushroom disc, the disc surface of the disc extends out of the outer wall of the steel column, and is provided with a plurality of connection holes, each of which is evenly distributed along the circumference of the disc;

[0026] After the Bailey beam is installed, a steel column is placed on the upper end of the disc, and the lower end of the steel column is bolted to the connecting hole of the disc through a flange. A number of steel ropes are arranged around the outer wall of the steel column, and one end of the steel rope away from the steel column is connected to a connecting plate, and a connecting hole connected to the steel rope is opened on the connecting plate.

[0027] Preferably, S14: blocking the reserved lifting holes and the Bailey beam lowering holes.

[0028] Preferably, the structure reserved for the Bailey beam lowering hole in step S14 is a funnel shape with an upper opening larger than a lower opening, and the plugging is performed by pouring micro-expansive concrete after hanging the formwork, and steel bars are placed in the lowering hole after hanging the formwork, and the steel bars are stuck in the transition between the upper opening and the lower opening.

[0029] Preferably, the adjusting member includes an adjusting block arranged on the portal steel frame, two ends of the adjusting block are fixed on opposite walls of the portal steel frame, the adjusting block is distributed close to the top of the silo, the adjusting block is provided with a through hole for passing two pull ropes of the winch, the adjusting block is provided with an inclined hole, an inclined rod is slidably connected in the inclined hole, and the inclined rod is rotatably connected to two rollers for passing the two pull ropes of the winch on one side passing through the lower end of the adjusting block, the adjusting block is provided with an electric pole in the inclined hole for driving the oblique rod to slide in the oblique hole, and the roller surface is provided with an annular embedding groove for embedding the two pull ropes of the winch, when it is necessary to lift the steel column, the electric pole drives the oblique rod to move upward in the oblique hole, so that the roller contacts the pull rope and drives the pull rope to move toward the direction of the steel column, and when it is necessary to lower the steel column, the electric pole drives the oblique rod to move downward, so that the roller is separated from the pull rope, and then the steel column moves to one side of the center column.

[0030] Preferably, two upper and lower opposite fixed plates are welded to the outer wall of the steel column at the upper end of the center column, and 8 fixed tooth plates are evenly arranged on the outer walls of the two fixed plates in a circumferential direction, and the fixed tooth plates of the upper and lower fixed plates correspond to each other one by one, and the tray includes a support plate inserted between the upper and lower fixed tooth plates, and the upper and lower ends of the support plate are respectively connected to the upper and lower fixed tooth plates by bolts, and each arc plate of the mushroom plate is also bolted to the support plate, and a number of fixing holes are opened at positions close to each other for two adjacent arc plates, and reinforcing plates are placed on the inner and outer sides of the connecting surfaces of the two adjacent arc plates, and the two reinforcing plates are connected by fastening bolts, and the fastening bolts pass through the fixing holes and are distributed corresponding to the fixing holes.

[0031] The beneficial effects of the present invention are as follows: when the silo wall is constructed by the slipform system, the Bailey beam is not raised with it. After the silo wall construction is completed, the center column is installed first, and then the Bailey beam is hoisted into the silo for fixation. This has the advantages of preventing the Bailey beam from rising with the slipform system, reducing the initial strength requirements for the silo wall concrete, and accelerating the construction speed. After the silo top is cast and formed, the Bailey beam and the center column are removed through the reserved hoisting holes and the Bailey beam lowering holes; the center of the silo is positioned by the center column, the deviation of the silo center is reduced, and the support of the Bailey beam by the center column improves the overall stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic diagram of the construction process of this embodiment;

[0034] Figure 2 This is a schematic diagram of the structure of the lifting hole in this embodiment;

[0035] Figure 3 This is a schematic diagram of the structure of the central column of this embodiment;

[0036] Figure 4 This is a schematic diagram of the structure of the Bailey beam in this embodiment;

[0037] Figure 5 This is a schematic diagram of the structure of the mushroom plate installed with a Bailey beam in this embodiment;

[0038] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of the middle part A;

[0039] Figure 7 This is a schematic diagram of the connection structure between the mushroom plate and the tray of this embodiment;

[0040] Figure 8 This is a structural schematic diagram for illustrating the lowering of the steel column in this embodiment.

[0041] Description of reference numerals:

[0042] In the figure: 1. center column; 11. steel column; 12. steel pad; 13. mushroom plate; 131. arc plate; 132. lowering hole; 133. Bailey beam; 134. lifting hole; 14. portal steel frame; 141. winch 2; 15. connecting plate; 151. latch; 152. locking rod; 16. disc; 161. connecting hole; 162. steel column; 163. wire rope; 17. adjusting block; 171. inclined hole; 172. inclined rod; 173. roller; 174. electric pole; 18. fixed plate; 181. fixed tooth plate; 182. support plate; 183. reinforcement plate; 184. fastening bolt; 2. silo; 21. corbel; 22. funnel layer. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] A silo roof construction method using a central column and Bailey beam support system, such as Figure 1 and Figure 2 , including the following steps: The data is mainly based on the data given by the construction of 25m diameter silo 2;

[0045] S1: Preset the center column 1. The center column 1 is connected by bolts with several sections of steel columns 11. First, find the center of the silo 2 on the foundation surface below the silo 2, mark the position of the steel column 11 at the bottom of the center column 1, and pop it out with an ink line;

[0046] S2: The sliding formwork reaches the top, and the silo 2 wall is constructed using the sliding formwork, and a number of brackets 21 are pre-buried on the inner wall of the upper silo 2;

[0047] S3: Set up an external platform, use an I-beam cantilever beam on the outer wall of silo 2, the cantilever beam is 1200mm long, the spacing is 1337mm, and it is connected to the pre-buried dowels in the silo wall of silo 2 with M16 bolts, with a total of 60 locations. Set up a frame on the I-beam cantilever beam to support the circular gutter at the lower edge of the silo roof;

[0048] S4: dismantling the slipform system;

[0049] like Figure 3 and Figure 4 and Figure 5 , S5: Center column 1 heightening: Use a tower crane to hoist in the standard section of the steel column 11, and bolt it section by section, and install the scaffolding synchronously to provide an installation operation surface for the steel column 11. The steel column 11 at the lower end of the center column 1 is provided with a steel pad 12 fixed on the foundation surface, and flanges are provided at both ends of each steel column 11 for bolt connection. The center column 1 passes through the funnel layer 22 of the silo 2, and the diameter of the steel column 11 passing through the funnel layer 22 is smaller than the diameter of other steel columns 11. Therefore, the diameter of the steel column 11 passing through the funnel layer 22 should be adjusted according to the funnel mouth size of the funnel layer, so it is smaller than the diameter of other steel columns 11. A tray is provided on the outer wall of the steel column 11 at the uppermost end of the center column 1, and a circular mushroom tray 13 formed by splicing four arc plates 131 is provided on the upper end of the tray; the installation process of the steel column 11 should be measured synchronously to ensure the verticality, and the overall verticality shall not be greater than 0.15%;

[0050] like Figure 5 and Figure 7, the specific connection structure of the tray and the mushroom tray 13: the outer wall of the steel column 11 at the upper end of the center column 1 is welded with two upper and lower opposite fixed disks 18, and the outer walls of the two fixed disks 18 are evenly provided with 8 fixed tooth plates 181 in the circumferential direction. The fixed tooth plates 181 of the upper and lower fixed disks 18 correspond to each other one by one. The tray includes a support plate 182 inserted between the upper and lower fixed tooth plates 181, and the upper and lower ends of the support plate 182 are respectively connected to the upper and lower fixed tooth plates 181 by bolts. Each arc plate 131 of the mushroom tray 13 is also bolted to the support plate 182, and two adjacent arcs are connected to each other. The arc plates 131 are provided with a plurality of fixing holes at positions close to each other. Reinforcing plates 183 are placed on both inner and outer sides of the connecting surfaces of two adjacent arc plates 131. The two reinforcing plates 183 are connected by fastening bolts 184. The fastening bolts 184 pass through the fixing holes and are distributed corresponding to the fixing holes. At this time, both sides of the reinforcing plate 183 extend to the two adjacent arc plates 131 respectively, that is, the reinforcing plate 183 covers the connecting surface between the two adjacent arc plates 131, and the two adjacent arc plates 131 are connected by the two reinforcing plates 183 on the inner and outer sides of the two arc plates 131.

[0051] like Figure 5 and Figure 7 The arrangement of the eight fixed tooth plates 181 facilitates the installation and removal of the support plate 182, and thus facilitates the installation and removal of the mushroom tray 13. And adopting this structure, it is convenient for construction personnel to sit astride on the support plate 182 to perform operations.

[0052] S6: Installation of Bailey beams 133: Use a tower crane to lift each Bailey beam 133 into the silo 2 and fix one end of the beam to the corbel 21 and the other end to the mushroom plate 13. Two adjacent Bailey beams 133 are connected and reinforced by steel pipe fasteners.

[0053] S7: laying of ring purlins, laying of ring purlins on Bailey beam 133;

[0054] S8: Laying of anti-fall net: Laying the anti-fall net on the ring purlin;

[0055] S9: Steel pipe support frame is erected, using steel pipe full-frame, radial arrangement, according to the cone shell slope, radial spacing ≤ 900mm, circumferential spacing ≤ 900mm; Bailey beam 133 is also called 321 steel bridge, single-layer standard SS, combined single-piece connection to form an 11m load-bearing truss, and then through the single-frame truss upper and lower chord longitudinal purlin reinforcement connection to form a supporting whole, each silo 2 is designed with 28 radial arrangements, the lower purlin is tied with steel pipes, and the upper purlin is laid with 10# I-beam circular purlins, with a spacing of less than 900mm, arranged according to the full-frame column steel pipe spacing, forming an integral steel truss support system;

[0056] S10: Install the silo roof formwork, install the silo roof formwork on the steel pipe support frame;

[0057] S11: Installation of silo roof reinforcement: laying the silo roof reinforcement on the silo roof formwork;

[0058] S12: Concrete pouring of the silo roof. During construction, the cone shell is poured in sections, divided into 6 sections, each pouring is about 1500mm. After the silo roof is poured and formed, a reserved hoisting hole 134 and a Bailey beam 133 lowering hole 132 are formed;

[0059] S13: Bailey beam 133 and center column 1 are removed.

[0060] When the silo 2 wall is constructed by the slipform system, the Bailey beam 133 is not raised with it. After the silo 2 wall construction is completed, the center column 1 is installed first, and then the Bailey beam 133 is hoisted into the silo 2 for fixing. This has the advantages of preventing the Bailey beam 133 from rising with the slipform system, reducing the initial strength requirements for the silo 2 wall concrete, and speeding up the construction speed. After the silo 2 roof is cast, the Bailey beam 133 and the center column 1 are removed through the reserved hoisting holes 134 and the Bailey beam 133 lowering holes 132; the center of the silo 2 is positioned by the center column 1, the center deviation of the silo 2 is reduced, and the support of the center column 1 to the Bailey beam 133 improves the overall stability.

[0061] like Figure 2 and Figure 4 , the lowering hole 132 is located above the two ends of each Bailey beam 133 in the length direction. In step S13, the removal of the Bailey beam 133 includes placing two 3T winches 1 on the outer wall of the silo roof. The two winches 1 are distributed next to the lowering holes 132 at both ends of a Bailey beam 133. After the winch 1 drops the Bailey beams 133 piece by piece to the bottom plate of the silo 2, they are disassembled in turn and transported to the outside of the silo 2 from the reserved lifting holes 134 on the silo roof; specifically, the two winches 1 lift the two ends of a Bailey beam 133 respectively, and then the two winches 1 tilt the Bailey beam 133 to facilitate the lowering of the Bailey beam 133 to the bottom plate of the silo 2. After the lowering is successful, the winch 1 on the top of the silo 2 is moved so that the two winches 1 are located next to the reserved lifting holes 134 above the next Bailey beam 133, and then the next Bailey beam 133 is lifted.

[0062] like Figure 5 and Figure 6Two opposite connecting plates 15 are welded on the upper end surfaces of the corbel 21 and the mushroom plate 13, and the two ends of each Bailey beam 133 are clamped on the opposite sides of the two connecting plates 15. The two connecting plates 15 are plugged with latches 151, and both ends of the latches 151 pass through and extend out of the Bailey beam 133, and a locking hole is opened on the extended outer wall. The length of the locking hole is perpendicular to the length of the latch 151, and a locking rod 152 with both ends extending out of the latch 151 is threadedly connected in the locking hole. At this time, the latch 151 fixes the two ends of the Bailey beam 133 on the connecting plates 15 of the corbel 21 and the mushroom plate 13 respectively, and then the locking rod 152 is screwed into the locking hole, thereby limiting the position of the latch 151, so that the position of the Bailey beam 133 is fixed, and the arrangement of the latch 151 and the connecting plate 15 facilitates the disassembly of the Bailey beam 133 in the later stage.

[0063] like Figure 8 The removal of the center column 1 in S13 includes the removal of the steel column 11 after all the Bailey beams 133 are removed. A portal steel frame 14 is set at the middle grain inlet on the silo roof. A winch 141 is set on the portal steel frame 14. The winch 141 is used to hang and tighten the top section of the steel column 11, and then the bolt connection points of the top two sections of the steel column 11 are removed. The steel column 11 is lifted to the bottom plate of the silo 2 and then transported to the outside of the silo 2 through the reserved lifting holes 134 on the silo roof. All steel columns 11 are removed step by step from top to bottom. At the same time, the scaffolding around the steel column 11 is removed along with the removal of the steel column 11. The middle grain inlet on the silo roof is formed when the silo 2 silo roof is poured, and is located at the top of the center column 1. Therefore, the steel column 11 is removed through the grain inlet.

[0064] like Figure 8 The position of the second winch 141 is staggered with the center line position of the steel column 11. An adjusting part is provided on the gantry steel frame 14. The adjusting part enables the second winch 141 to lift the steel column 11 and place the lifted steel column 11 on one side of the center column 1, thereby facilitating the lowering of the lifted steel column 11.

[0065] like Figure 8 The adjusting member includes an adjusting block 17 arranged on the portal steel frame 14, and the two ends of the adjusting block 17 are fixed on the opposite walls of the portal steel frame 14. The adjusting block 17 is distributed near the top of the silo 2. The adjusting block 17 is provided with a through hole for the pull rope on the second winch 141 to pass through. The adjusting block 17 is provided with an inclined hole 171, and an inclined rod 172 is slidably connected in the inclined hole 171. The inclined rod 172 is rotatably connected to one side of the lower end of the adjusting block 17 through which two rollers 173 for the pull rope of the second winch 141 pass through. The adjusting block 17 is provided with an electric pole 174 in the inclined hole 171 for driving the inclined rod 172 to slide in the inclined hole 171, and an annular embedding groove for the pull rope of the second winch 141 to be embedded is provided on the wheel surface of the roller 173;

[0066] like Figure 8When the pull rope on the second winch 141 is lowered to lift the steel column 11, the pull rope on the second winch 141 needs to be located above the center pole. At this time, the electric pole 174 drives the inclined rod 172 to move upward in the inclined hole 171, so that the roller 173 contacts the pull rope and drives the pull rope to move toward the steel column 11 until the pull rope on the second winch 141 is located above the center pole, which is convenient for lifting the uppermost steel column 11. After lifting the steel column 11, when the steel column 11 needs to be lowered, the electric pole 174 drives the inclined rod 172 to move upward in the inclined hole 171. The inclined rod 172 moves downward, and during this process, the pull rope of the winch 141 always conflicts with the embedded groove of one of the rollers 173 until the pull rope of the winch 141 is vertical. The two rollers 173 and the pull rope are no longer in conflict but tangent to each other, so that the pull rope moves vertically between the two rollers 173. At this time, the steel column 11 moves to one side of the central column 1, which facilitates the pull rope of the winch 141 to lower the steel column 11 to the bottom plate of the silo 2, and then the steel columns 11 are lowered one by one in a reciprocating cycle.

[0067] like Figure 7 In step S5, the upper end surface of the steel column 11 at the uppermost end of the center column 1 is provided with a disc 16 flush with the upper end surface of the mushroom plate 13. The disc 16 is coaxially distributed with the steel column 11. The disc surface of the disc 16 extends out of the outer wall of the steel column 11 and is provided with a plurality of connecting holes 161. The connecting holes 161 are evenly distributed along the circumference of the disc 16. The arrangement of the disc 16 is convenient for construction workers to place tools, and the connecting holes 161 on the disc 16 are convenient for construction workers to buckle one end of the safety belt on the disc 16, thereby increasing the safety of construction;

[0068] like Figure 5 and Figure 7 After the Bailey beam 133 is installed, a steel column 162 is placed on the upper end of the disk 16, and the lower end of the steel column 162 is bolted to the connecting hole 161 of the disk 16 through a flange. A plurality of steel wire ropes 163 are arranged around the outer wall of the steel column 162. The end of the steel wire rope 163 away from the steel column 162 is connected to the connecting plate 15. The connecting plate 15 is provided with a connecting hole connected to the steel wire rope 163. At this time, the setting of the steel wire rope 163 generates tension on the mushroom disk 13, thereby increasing the stability of the structure.

[0069] S14: Block the reserved lifting hole 134 and the lowering hole 132 of the Bailey beam 133.

[0070] In step S14, the structure reserved for the lowering hole 132 of the Bailey beam 133 is a funnel shape with an upper opening larger than a lower opening. The plugging is performed by pouring micro-expansive concrete after hanging the formwork, and steel bars are placed in the lowering hole 132 after hanging the formwork. The steel bars are stuck at the transition between the upper opening and the lower opening. At this time, the possibility of later leakage of the lowering hole 132 of the Bailey beam 133 after plugging is reduced.

[0071] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A silo roof construction method using a central column and Bailey beam support system, characterized in that: The following steps are involved: S1: Preset center column. The center column is connected by bolts of several steel columns. First, find the center of the silo on the foundation surface below the silo, mark the position of the lowest steel column of the center column, and pop it out with an ink line; S2: Slipform to the top, use the slipform to construct the silo wall, and pre-embed several brackets on the inner wall of the upper silo wall; S3: Setting up the external platform; S4: Dismantling the slipform system; S5: Center column height connection: Use a tower crane to hoist in standard steel column sections, and bolt them section by section. At the same time, install the scaffolding synchronously to provide a steel column installation operation surface. The steel column at the lower end of the center column is provided with a steel pad fixed on the foundation surface. Flange plates are provided at both ends of each steel column for bolt connection. The center column passes through the funnel layer of the silo, and the diameter of the steel column passing through the funnel layer is smaller than the diameter of other steel columns. A tray is provided on the outer wall of the steel column at the uppermost end of the center column, and a circular mushroom tray formed by splicing four arc-shaped plates is provided on the upper end of the tray; S6: Bailey beam installation: use a tower crane to lift each Bailey beam into the silo and fix one end to the corbel and the other end to the mushroom plate. Two adjacent Bailey beams are connected and reinforced with steel pipe fasteners; S7: laying of ring purlins, laying of ring purlins on Bailey beams; S8: laying of anti-fall net; S9: The steel pipe support frame is erected, using a steel pipe full-frame frame, radial arrangement, and shape finding according to the cone shell slope; S10: Install the silo roof formwork, install the silo roof formwork on the steel pipe support frame; S11: Installation of silo roof reinforcement: laying the silo roof reinforcement on the silo roof formwork; S12: Concrete pouring of silo roof, after the silo roof is poured and formed, reserved hoisting holes and Bailey beam lowering holes are formed; S13: Bailey beam and center column removal; The removal of the center column in S13 includes the removal of the steel column after all the Bailey beams are removed. A portal steel frame is set at the grain inlet in the middle of the silo roof. A second winch is installed on the portal steel frame. The second winch is used to lift and tighten the top section of the steel column. Then the bolt connection points of the top two sections of the steel column are removed. The steel column is lifted to the bottom plate of the silo and then transported to the outside of the silo through the reserved lifting hole on the silo roof. All steel columns are removed step by step from top to bottom. At the same time, the scaffolding around the steel column is removed along with the removal of the steel column. The position of the second hoist is staggered with the center line of the steel column, and an adjustment member is provided on the gantry steel frame, and the adjustment member enables the hoisted steel column to be located on one side of the center column after the second hoist lifts the steel column; The adjusting member comprises an adjusting block arranged on the portal steel frame, two ends of the adjusting block are fixed on opposite walls of the portal steel frame, the adjusting block is distributed near the top of the silo, the adjusting block is provided with a through hole for passing two pull ropes of the winch, the adjusting block is provided with an inclined hole, an inclined rod is slidably connected in the inclined hole, the inclined rod is rotatably connected with two rollers for passing the two pull ropes of the winch on one side passing through the lower end of the adjusting block, the adjusting block is provided with an electric pole driving the inclined rod to slide in the inclined hole, the roller surface is provided with an annular embedding groove for embedding the two pull ropes of the winch, when it is necessary to lift the steel column, the electric pole drives the inclined rod to move upward in the inclined hole, so that the roller contacts the pull rope and drives the pull rope to move toward the direction of the steel column, when it is necessary to lower the steel column, the electric pole drives the inclined rod to move downward, so that the roller is separated from the pull rope, and then the steel column moves to one side of the center column; The upper end surfaces of the corbel and the mushroom plate are welded with two opposite connecting plates, the two ends of each Bailey beam are clamped on the opposite sides of the two connecting plates, and the two connecting plates are plugged with latches, the two ends of the latches pass through and extend out of the Bailey beam, and locking holes are opened in the extended outer wall, the length of the locking hole is perpendicular to the length of the latch, and the locking hole is threadedly connected to a locking rod with the latches extending from both ends; In step S5, the upper end surface of the steel column at the upper end of the central column is provided with a disc flush with the upper end surface of the mushroom plate, the disc surface of the disc extends out of the outer wall of the steel column, and is provided with a plurality of connection holes, each of which is evenly distributed along the circumference of the disc; After the Bailey beam is installed, a steel column is placed on the upper end of the disc, and the lower end of the steel column is bolted to the connecting hole of the disc through a flange. A number of steel ropes are arranged around the outer wall of the steel column, and one end of the steel rope away from the steel column is connected to a connecting plate, and a connecting hole connected to the steel rope is opened on the connecting plate.

2. The silo roof construction method using a central column and Bailey beam support system as claimed in claim 1, characterized in that: The above S3: an external platform is set up, specifically, the cantilever beam is connected to the pre-buried dowel in the silo wall with bolts, the cantilever beam is 1200mm long, the spacing is 1337mm, and a total of 60 places are set along the outer wall of the silo; a frame is set up on the cantilever to support the circular gutter at the lower edge of the silo roof.

3. The silo roof construction method using a central column and Bailey beam support system as claimed in claim 1, characterized in that: The lowering holes are located above the two ends of each Bailey beam in the length direction. In step S13, the removal of the Bailey beam includes placing two winches 1 on the outer wall of the silo roof. The two winches 1 are distributed next to the lowering holes at both ends of a Bailey beam. After the winch 1 lowers the Bailey beams one by one to the bottom plate of the silo, they are disassembled in turn and transported to the outside of the silo from the reserved lifting holes on the silo roof.

4. The silo roof construction method using a central column and Bailey beam support system as claimed in claim 1, characterized in that: S14: Seal the reserved lifting holes and Bailey beam lowering holes.

5. The silo roof construction method using a central column and Bailey beam support system as claimed in claim 4, characterized in that: In step S14, the structure reserved for the Bailey beam lowering hole is a funnel shape with an upper opening larger than a lower opening. The plugging is performed by pouring micro-expansive concrete after the formwork is hung, and steel bars are placed in the lowering hole after the formwork is hung, and the steel bars are stuck at the transition between the upper opening and the lower opening.

6. The silo roof construction method using a central column and Bailey beam support system as claimed in claim 1, characterized in that: The outer wall of the steel column at the upper end of the center column is welded with two upper and lower opposite fixed disks, and the outer walls of the two fixed disks are evenly provided with 8 fixed tooth plates in the circumferential direction, and the fixed tooth plates of the upper and lower fixed disks correspond to each other one by one. The tray includes a supporting plate inserted between the upper and lower fixed tooth plates, and the upper and lower ends of the supporting plate are respectively connected to the upper and lower fixed tooth plates by bolts, and each arc plate of the mushroom plate is also bolted to the supporting plate, and a number of fixing holes are opened at positions close to each other between the two adjacent arc plates, and reinforcing plates are placed on the inner and outer sides of the connecting surfaces of the two adjacent arc plates, and the two reinforcing plates are connected by fastening bolts, and the fastening bolts pass through the fixing holes and are distributed corresponding to the fixing holes.

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