A shallow silo roof formwork system and a construction method thereof

Abstract

The present application relates to the field of building, specifically relates to a kind of shallow round warehouse roof formwork system and its construction method, including fixedly installed on the center column of shallow round warehouse bottom wall, the axis of center column coincides with shallow round warehouse;The upper end of center column is fixedly installed with conversion beam, and the inner wall of shallow round warehouse is fixedly installed with multiple steel corbel supports that are circumferentially uniformly spaced, each steel corbel support is fixedly installed with bailey frame between conversion beam, and multiple bailey frames are horizontally arranged radially around center column;The top of multiple bailey frames is jointly laid with wood formwork, and the top of wood formwork is erected with full-frame scaffold, uses center column, steel corbel support, bailey frame and other support mechanism, replaces traditional full-frame scaffold, and the use amount of steel pipe and fastener is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of construction, specifically to a shallow circular silo roof support system and its construction method. Background Technology

[0002] Shallow round silos are vertical cylindrical grain storage facilities with a circular cross-section and a grain storage height to inner diameter ratio of less than 1.5. They are a modern type of silo that my country introduced and promoted on a large scale since the 1990s. Currently, the total storage capacity of shallow round silos in China is about 110 million tons, accounting for 14.7% of the total storage capacity in the country. They are the mainstream choice for the country's medium and long-term grain reserves.

[0003] Traditional construction of shallow circular silo roofs often employs full-span steel pipe and coupler scaffolding as the formwork support system. This system requires erecting a large number of steel pipes and couplers layer by layer from the silo floor to the designed roof elevation, followed by laying formwork, tying reinforcing bars, and pouring concrete on top of the scaffolding. This method involves a large amount of construction work, a long construction period, and poor economic efficiency. Therefore, developing an economical and efficient formwork support system for shallow circular silo roofs is a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a shallow circular silo roof support system and its construction method, which is efficient, economical and applicable, so as to solve the defects mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A shallow circular silo roof support system includes a central column fixedly installed on the bottom wall of the shallow circular silo, the central column coinciding with the axis of the shallow circular silo; a transfer beam fixedly installed at the upper end of the central column; multiple steel bracket supports evenly spaced circumferentially installed on the inner wall of the shallow circular silo; a Bailey bridge fixedly installed between each steel bracket support and the transfer beam; the multiple Bailey bridges are arranged horizontally in a radial pattern around the central column; a wooden formwork is laid on the top of the multiple Bailey bridges; and a full-span scaffold is erected on top of the wooden formwork.

[0006] As a further improvement, the central column is composed of multiple tower crane standard sections connected in sequence, with adjacent tower crane standard sections connected by high-strength bolts.

[0007] As a further improvement, the transfer beam includes a cross beam fixedly installed at the upper end of the central column, and an annular box beam coaxially arranged with the central column is fixedly installed on the top of the cross beam; the inner lower chord of the Bailey bridge is fixedly connected to the annular box beam, and the outer lower chord is fixedly connected to the steel bracket support.

[0008] As a further improvement, a reinforcing channel steel is fixedly installed between the upper chords of two adjacent Bailey bridges. The reinforcing channel steel is arranged circumferentially around the central column, and multiple rings of the reinforcing channel steel are arranged at intervals from the inside to the outside with the central column as the center.

[0009] As a further improvement, secondary beam mesh is fixedly installed on the upper chords of multiple Bailey bridges located above the annular box girder. The secondary beam mesh is welded from multiple I-beams arranged in a grid pattern. The top of the reinforcing channel steel and the top of the secondary beam mesh are on the same horizontal plane, and wooden formwork is laid on the top of the reinforcing channel steel and the top of the secondary beam mesh together.

[0010] A construction method for a shallow circular silo roof formwork system, characterized by the following steps: S1, During the slipform construction of the shallow circular silo wall, multiple sets of bolt sleeves are pre-embedded along the circumferential direction on the inner side of the silo wall according to the design height, for subsequent installation of steel bracket supports; S2, the prefabricated steel bracket support is fixedly installed on the bolt sleeve embedded in the inner side of the silo wall using high-strength bolts; S3, pour the central column foundation on the bottom wall of the shallow circular silo; S4. The standard tower crane sections are hoisted onto the central column foundation and spliced ​​to form the central column; adjacent standard tower crane sections are connected by high-strength bolts; before splicing the topmost standard tower crane section, a cross beam and a ring box beam are pre-installed on its top. S5, with the central column as the center, each Bailey frame is hoisted into position in a centrally symmetrical manner, so that the inner lower chord of each Bailey frame is supported on the ring box girder and the outer lower chord is supported on the corresponding steel bracket support, and is fixed by bolts; S6, Reinforcing channel steel is installed between the upper chords of the Bailey bridge, and the reinforcing channel steel is arranged in multiple circles around the central column; S7. Install secondary beam mesh on the top of the upper chord of the Bailey bridge above the ring box girder, so that the top surface of the secondary beam mesh is on the same horizontal plane as the top surface of the reinforcing channel steel, forming a continuous support surface. S8, wooden formwork is laid on the top of the reinforcing channel steel and the top of the secondary beam mesh to form a continuous construction platform; S9, erect full-span scaffolding and warehouse roof formwork system on top of the wooden formwork; S10, Tie the steel reinforcement of the warehouse roof structure and pour the concrete for the warehouse roof; S11, Moisture curing is carried out on the concrete top of the silo to achieve 100% of the design strength; S12. After the concrete strength of the silo top reaches the design requirements, the full-span scaffolding, wooden formwork, reinforcing channel steel and secondary beam mesh are removed in sequence. The Bailey bridge is lowered to the bottom of the silo, and finally the central column is removed in sections.

[0011] As a further improvement, in S1, a plug is used to seal the end of the bolt sleeve to prevent concrete blockage.

[0012] As a further improvement, in S3, the central column foundation utilizes the existing central pressure relief pipe foundation of the shallow circular silo for expansion, and a reinforced concrete column pier is added on the top surface of the central pressure relief pipe foundation. The top of the reinforced concrete column pier is pre-embedded with steel plates and anchor bolts, and the lowest tower crane standard section is fixedly connected to the central column foundation through anchor bolts.

[0013] As a further improvement, S12 uses two winches, whose wire ropes are connected to both ends of the Bailey bridge respectively. The winches are controlled synchronously to lower the entire Bailey bridge horizontally.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By adopting support mechanisms such as central columns, steel brackets, and Bailey bridges to replace traditional full-span scaffolding, the amount of steel pipes and fasteners used has been greatly reduced, the construction process has been simplified, the construction period has been effectively shortened, and the construction cost has been significantly reduced. Significant progress has been made in both economy and construction efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the central column in an embodiment of the present invention; Figure 3 This is a schematic diagram of the transfer beam according to an embodiment of the present invention; Figure 4 This is a top view schematic diagram of the transfer beam according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the steel bracket support according to an embodiment of the present invention; Figure 6 yes Figure 5 A magnified view of a portion of the image; Figure 7 This is a top view schematic diagram of the steel bracket support according to an embodiment of the present invention; Figure 8 This is a top view of a Bailey bridge according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the reinforcing channel steel according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the secondary beam mesh structure according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the installation of the Bailey bridge according to an embodiment of the present invention.

[0017] In the diagram: 1-Shallow circular silo; 2-Central column; 3-Standard tower crane section; 4-Cross beam; 5-Circular box girder; 6-Steel corbel support; 7-Bolt sleeve; 8-Bailey bridge; 9-U-bolt; 10-Reinforcing channel steel; 12-Steel plate pad; 13-Secondary beam mesh; 14-Wooden formwork; 15-Full-span scaffolding; 16-Central column foundation; 17-Reinforced concrete column pier. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1 to 11 As shown, a shallow circular silo top support system includes a central column 2 fixedly installed on the bottom wall of the shallow circular silo 1, the central column 2 coinciding with the axis of the shallow circular silo 1. Figure 2 As shown, the central column 2 is composed of multiple tower crane standard sections 3 connected in sequence, using 6013 tower crane standard sections, and the tower crane standard sections 3 are connected with M30 bolts.

[0020] like Figure 3 and Figure 4 As shown, a transfer beam is fixedly installed at the upper end of the central column 2. The transfer beam includes a cross beam 4, which is bolted to the top of the uppermost standard tower crane section 3. The cross beam is made of Q355B I-beams with a cross section height of 300mm, a flange width of 300mm, a web thickness of 14mm, a flange thickness of 20mm, and a length of 3.3m. A ring box beam 5, coaxially arranged with the central column 2, is bolted to the top of the cross beam 4. The ring box beam 5 is made of 14mm thick steel plate welded into a ring shape. The ring box beam 5 has an outer diameter of 3.3m, an inner diameter of 2.7m, and a height of 350mm. At positions 50mm and 250mm from the outer edge of the ring, a 10mm thick steel plate is welded to form a surrounding steel beam. The surrounding steel beam has four stiffening ribs inside.

[0021] like Figures 5 to 7As shown, multiple steel bracket supports 6 are fixedly installed on the inner wall of the shallow circular silo 1, evenly spaced circumferentially. Multiple sets of bolt sleeves 7 are pre-embedded in the inner wall of the shallow circular silo 1, each set containing 6 bolt sleeves. The steel bracket supports 6 are fixedly connected to the corresponding bolt sleeves 7 by high-strength bolts. The steel bracket supports 6 are made of 16mm thick Q235 steel plates, welded off-site. The steel bracket supports 6 consist of a horizontal support plate, a web plate, and a vertical plate, all components are fully welded, with a weld height of not less than 6mm. Two Φ18 bolt holes are opened on the horizontal support plate for connection to the lower chord of the Bailey bridge 8 using M16 bolts; six Φ30 bolt holes are opened on the vertical plate for connection to the pre-embedded bolt sleeves 7 in the silo wall using 10.9 grade M24 high-strength bolts.

[0022] Each steel bracket 6 is fixedly installed between itself and the transfer beam with a Bailey bridge 8, such as Figure 8 As shown, multiple Bailey bridges 8 are arranged horizontally in a radial pattern around the central column 2. Specifically, there are 36 Bailey bridges 8, each 12.00m long. The inner lower chord of each Bailey bridge 8 is fixedly connected to the top of the annular box girder 5 by bolts, and the outer lower chord is fixedly connected to the top of the steel bracket support 6 by bolts.

[0023] To prevent displacement due to deformation in the middle of the Bailey bridge 8 and to ensure its lateral stability, reinforcing channel steel 10 is fixedly installed between the upper chords of adjacent Bailey bridge 8 sections. Specifically, the reinforcing channel steel 10 is a #10 channel steel, arranged circumferentially around the central column 2, with multiple rings spaced outwards from the center column. Figure 9 As shown, the reinforcing channel steel 10 and the upper chord of the Bailey bridge 8 are connected and fixed by U-bolts 9, which are M10×240 type. The U-bolts are inserted from bottom to top to tighten the reinforcing channel steel 10 and the upper chord of the Bailey bridge 8. 8mm thick steel plate pads 12 are successively placed on both ends of the U-bolts 9 and nuts are screwed in.

[0024] In addition, secondary beam mesh 13 is jointly fixedly installed on the upper chords of multiple Bailey bridges 8 located above the annular box girder 5. For example... Figure 10 As shown, the secondary beam mesh 13 is welded from multiple 10# I-beams arranged in a grid pattern, covering the recesses located at the centers of multiple Bailey bridge frames 8. The secondary beam mesh 13 is fixedly connected to the upper chord of the Bailey bridge frame 8 by binding with steel wire or by bolts. The top of the reinforcing channel steel 10 and the top of the secondary beam mesh 13 are on the same horizontal plane, and the top of the reinforcing channel steel 10 and the top of the secondary beam mesh 13 are covered together with wooden formwork 14.

[0025] A full-span scaffolding 15 is erected on top of the wooden formwork 14.

[0026] A construction method for a shallow circular silo roof formwork system includes the following steps: S1. During the slipform construction of the shallow circular silo 1, multiple sets of bolt sleeves 7 are pre-embedded along the circumferential direction on the inner side of the silo wall according to the design height. Each set contains 6 bolt sleeves for subsequent installation of steel bracket supports 6. When pre-embedding, finished plastic plugs should be used to seal the bolt sleeves 7 to avoid blockage of the bolt sleeves 7 due to concrete pouring during the slipform process.

[0027] S2, the construction workers used the suspended scaffolding under the operating platform inside the slipform to install the steel bracket support 6. The prefabricated steel bracket support 6 was fixed to the bolt sleeve 7 embedded in the inner side of the warehouse wall by six M24 high-strength bolts.

[0028] S3, pour the central column foundation 16 on the bottom wall of the shallow circular silo 1. The central column foundation 16 is an enlargement of the original central pressure relief pipe foundation of the shallow circular silo 1, expanding the original foundation 2200×2200 to 4200×4200 to meet the requirements of the central column foundation. The top surface of the original foundation is increased by 600mm. Four reinforced concrete column piers 17 are added on the top surface of the central pressure relief pipe foundation. Steel plates and anchor bolts are pre-embedded on the top of the reinforced concrete column piers 17.

[0029] S4, using tower crane hoisting method, the tower crane standard section 3 is hoisted to the central column foundation and spliced ​​to form the central column 2; adjacent tower crane standard sections 3 are connected by high-strength bolts, and the bottom tower crane standard section 3 is fixedly connected to the central column foundation 16 by anchor bolts; before splicing the top tower crane standard section 3, the cross beam 4 and the ring box beam 5 are pre-installed on its top.

[0030] S5, such as Figure 11 As shown, with the central column 2 as the center, each Bailey frame 8 is hoisted into position in a centrally symmetrical manner, so that the inner lower chord of each Bailey frame 8 is supported on the annular box girder 5 and the outer lower chord is supported on the corresponding steel bracket 6, and is fixed by bolts.

[0031] S6, a reinforcing channel steel 10 is installed between the upper chords of the Bailey bridge 8, and the reinforcing channel steel 10 is arranged in multiple rings around the central column 2.

[0032] S7. Install a secondary beam mesh 13 on the top of the upper chord of the Bailey bridge 8 above the ring box girder 5, so that the top surface of the secondary beam mesh 13 and the top surface of the reinforcing channel steel 10 are on the same horizontal plane, forming a continuous support surface.

[0033] S8, wooden formwork 14 is laid on the top of the reinforcing channel steel 10 and the top of the secondary beam mesh 13 to form a continuous construction platform.

[0034] S9, erect a full-span scaffolding 15 and a warehouse roof formwork system on top of the wooden formwork 14.

[0035] S10, tying the steel reinforcement bars for the warehouse roof structure and pouring the concrete for the warehouse roof.

[0036] S11, Moisturize and cure the concrete on the top of the silo until the concrete strength reaches 100% of the design strength.

[0037] S12: After the concrete strength at the top of the silo reaches the design requirements, dismantle the full-span scaffolding 15, wooden formwork 14, reinforcing channel steel 10, and secondary beam mesh 13 in sequence. Use two winches, with their wire ropes connected to both ends of a Bailey bridge 8, and lower the entire Bailey bridge 8 horizontally to the bottom of the silo through synchronous control; repeat the above operation to lower each Bailey bridge 8 one by one. Finally, dismantle the central column 2 in sections.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shallow silo roof formwork system, characterised in that: The system includes a central column fixedly installed on the bottom wall of a shallow circular silo, the central column coinciding with the axis of the shallow circular silo; a transfer beam fixedly installed at the upper end of the central column; multiple steel bracket supports evenly spaced circumferentially installed on the inner wall of the shallow circular silo; a Bailey bridge fixedly installed between each steel bracket support and the transfer beam; the multiple Bailey bridges are arranged horizontally in a radial pattern around the central column; a wooden formwork is laid on the top of the multiple Bailey bridges; and a full-span scaffold is erected on top of the wooden formwork.

2. The shallow circular silo roof support system as described in claim 1, characterized in that: The central column is composed of multiple tower crane standard sections connected in sequence, and adjacent tower crane standard sections are connected by high-strength bolts.

3. The shallow circular silo roof support system as described in claim 1, characterized in that: The transfer beam includes a cross beam fixedly installed at the upper end of the central column, and an annular box beam coaxially arranged with the central column is fixedly installed on the top of the cross beam; the inner lower chord of the Bailey bridge is fixedly connected to the annular box beam, and the outer lower chord is fixedly connected to the steel bracket support.

4. The shallow circular silo roof support system as described in claim 3, characterized in that: A reinforcing channel steel is fixedly installed between the upper chords of two adjacent Bailey bridges. The reinforcing channel steel is arranged circumferentially around the central column, and multiple rings of the reinforcing channel steel are arranged at intervals from the inside to the outside with the central column as the center.

5. The shallow circular silo roof support system as described in claim 4, characterized in that: Secondary beam mesh is fixedly installed on the upper chords of multiple Bailey bridges located above the annular box girder. The secondary beam mesh is welded from multiple I-beams arranged in a grid pattern. The top of the reinforcing channel steel and the top of the secondary beam mesh are on the same horizontal plane, and wooden formwork is laid on the top of the reinforcing channel steel and the top of the secondary beam mesh together.

6. A construction method for the shallow circular silo roof formwork system as described in any one of claims 1-5, characterized in that, Includes the following steps: S1, During the slipform construction of the shallow circular silo wall, multiple sets of bolt sleeves are pre-embedded along the circumferential direction on the inner side of the silo wall according to the design height, for subsequent installation of steel bracket supports; S2, the prefabricated steel bracket support is fixedly installed on the bolt sleeve embedded in the inner side of the silo wall using high-strength bolts; S3, pour the central column foundation on the bottom wall of the shallow circular silo; S4. The standard tower crane sections are hoisted onto the central column foundation and spliced ​​to form the central column; adjacent standard tower crane sections are connected by high-strength bolts; before splicing the topmost standard tower crane section, a cross beam and a ring box beam are pre-installed on its top. S5, with the central column as the center, each Bailey frame is hoisted into position in a centrally symmetrical manner, so that the inner lower chord of each Bailey frame is supported on the ring box girder and the outer lower chord is supported on the corresponding steel bracket support, and is fixed by bolts; S6, Reinforcing channel steel is installed between the upper chords of the Bailey bridge, and the reinforcing channel steel is arranged in multiple circles around the central column; S7. Install secondary beam mesh on the top of the upper chord of the Bailey bridge above the ring box girder, so that the top surface of the secondary beam mesh is on the same horizontal plane as the top surface of the reinforcing channel steel, forming a continuous support surface. S8, wooden formwork is laid on the top of the reinforcing channel steel and the top of the secondary beam mesh to form a continuous construction platform; S9, erect full-span scaffolding and warehouse roof formwork system on top of the wooden formwork; S10, Tie the steel reinforcement of the warehouse roof structure and pour the concrete for the warehouse roof; S11, Moisture curing is carried out on the concrete top of the silo to achieve 100% of the design strength; S12. After the concrete strength of the silo top reaches the design requirements, the full-span scaffolding, wooden formwork, reinforcing channel steel and secondary beam mesh are removed in sequence. The Bailey bridge is lowered to the bottom of the silo, and finally the central column is removed in sections.

7. The construction method as described in claim 6, characterized in that: In S1, a plug is used to seal the end of the bolt sleeve to prevent concrete blockage.

8. The construction method as described in claim 6, characterized in that: In S3, the central column foundation utilizes the existing central pressure relief pipe foundation of the shallow circular silo, which is then enlarged. A reinforced concrete column pier is added to the top surface of the central pressure relief pipe foundation. A steel plate and anchor bolts are pre-embedded at the top of the reinforced concrete column pier. The lowest tower crane standard section is fixedly connected to the central column foundation through anchor bolts.

9. The construction method as described in claim 6, characterized in that: In S12, two winches are used, with their wire ropes connected to both ends of the Bailey bridge. The Bailey bridge is lowered horizontally as a whole by synchronously controlling the winches.

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