Construction method of super-high large-span silo roof

Abstract

This invention relates to the field of building construction technology, specifically to a method for constructing the roof slab of an ultra-high, large-span silo. The method includes the following steps: leveling and reinforcing the steel pipe truss inside the silo; 24 hours after the top layer of reinforced concrete wall is poured, fixing the slipform platform; removing the slipform templates and surrounding rings from the inner and outer silo walls; anchoring the slipform at the silo roof and walls; and using steel pipe diagonal braces to support the overall steel pipe truss at each truss frame position. The beneficial effects are: the proposed method for constructing the roof slab of an ultra-high, large-span silo uses a steel pipe lattice rigid platform. Slipforming stops after reaching the lower elevation of the highest reinforced concrete beam in the silo, and then the slipform lifting frame is temporarily fixed. The slipform rigid platform is connected to the silo wall through embedded parts and additional support is added, transferring the load borne by the slipform rigid platform to the silo wall.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a method for constructing the roof slab of an ultra-high, large-span silo. Background Technology

[0002] As the diameter and height of the silo structure increase, traditional slipform rigid platforms can no longer meet the needs of silo top slab construction, and there is an urgent need for a new type of formwork platform that is low-cost and easy to install.

[0003] In the existing technology, the cylindrical structure is generally constructed using sliding formwork. Slipforming is a construction process in cast-in-place concrete engineering. During slipforming construction, the formwork is assembled at one time, and an operating platform for construction personnel is set on it. The formwork is simultaneously lifted and continuously operated from bottom to top along the surface of the cast-in-place concrete while pouring concrete.

[0004] However, at present, the diameter and height of the cylindrical structure are gradually increasing. Based on the actual construction results of slipform in recent years, after each pouring, the bottom of the concrete formwork of the wall and column heads often experiences bulging of varying degrees, which leads to a series of quality problems such as poor concrete surface quality and deviation of the structural core. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for the roof slab of ultra-high, long-span silos, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a construction method for the roof slab of an ultra-high, large-span silo, the method comprising the following steps:

[0007] The steel pipe truss inside the warehouse was leveled and reinforced. Twenty-four hours after the top layer of the warehouse wall was poured with reinforced concrete, the slip frame was fixed, the slip frame templates and enclosures of the inner and outer warehouse walls were removed, the truss was anchored at the top and walls of the warehouse, and the overall steel pipe truss was supported by steel pipe diagonal braces at each frame position.

[0008] Erect platform supports. After the slipform rigid platform is in place and fixed, erect the reinforced concrete structure supports for the top of the silo. After the slipform rigid platform is fixed, proceed with the wall panel reinforcement binding process. After the wall panel reinforcement binding is completed and accepted, promptly erect the wall panel formwork. Before erecting platform supports, the main beam formwork should be erected first.

[0009] Install the Bailey bridge. Based on the Bailey bridge's positioning, use a tower crane to transport it to the top of the silo for installation. After the silo is slipformed to the set elevation, pour concrete piers at the Bailey bridge's erection position to support it. After the Bailey steel truss beams are installed, install the connecting rods between the Bailey truss beams and the slipform rigid platform.

[0010] When installing the beam formwork, according to the design requirements, first determine the elevation point when placing the beam bottom plate, then level it on all four sides of the silo. After the beam bottom plate is determined, erect one side of the beam slab along the beam bottom plate, tie the beam reinforcement, and finally erect the formwork for the other side of the beam slab.

[0011] Tie the reinforcing bars to ensure that the grade, diameter, number, spacing, and location of the reinforcing bars, as well as the specifications, quantity, and location of the embedded parts, meet the design requirements;

[0012] The concrete pouring for the warehouse roof slab is planned to be carried out in two stages: first, the roof beam will be poured, and second, the roof slab will be poured, using pumped concrete.

[0013] The formwork, Bailey bridge, and truss were dismantled, and the support frame for the main beams could only be removed after the concrete strength reached 100%.

[0014] Preferably, the specific operations for leveling and reinforcing the steel pipe truss inside the warehouse include:

[0015] A crossbeam steel pipe is added to the top of the reinforced concrete silo wall. A short steel pipe is used to connect the inner and outer legs and support rods of the lifting frame. Before reinforcement, the construction plan is explained to the project leaders at all levels, and then the technical and safety instructions are given to the actual construction personnel and foremen at each level.

[0016] Add a vertical support pole on both the inner and outer sides. The lower end of the pole is welded to the embedded part of the reinforced concrete silo wall, and the upper end is connected to the crossbeam steel pipe that connects the inner and outer lifting frame legs. The gap between the pole and the reinforced concrete silo wall is filled with wooden plugs. The intersection of the pole and the rigid platform of the slipform is connected with fasteners.

[0017] The steel pipe diagonal braces are evenly arranged along the perimeter of the silo wall, with 28 steel pipe diagonal braces per silo. The jacks and their oil circuit system are removed, the upper and lower crossbeams of the lifting frame are removed, and the sliding formwork rigid platform is fixed.

[0018] Preferably, the specific operations for setting up the platform support include:

[0019] First, tie the wall panel reinforcement bars and lay the beam base plate, then erect the wall panel formwork, and finally set up the warehouse roof support.

[0020] Before binding the reinforcing bars, loose reinforced concrete on the top of the silo wall should be removed, and the joint surfaces of the construction joints and the dust on the vertical reinforcing bars of the silo wall should be treated before binding the wall panel reinforcing bars.

[0021] When the height of the main beam exceeds the length of the slipform, the slipform should be placed on top and another formwork should be hung at the bottom to close it. When closing, care should be taken to avoid the connecting rods and support rods at the lifting frame support. Tie bolts should be installed on all wall panels to prevent the side pressure of the formwork from being transmitted to the top formwork support system.

[0022] The platform support poles should be consistent with the sliding formwork rigid platform poles and form a lattice structure to further improve the overall rigidity of the platform.

[0023] Preferably, the specific operations for installing the Bailey bridge include:

[0024] After the five-piece assembly is completed on the ground, it is transported to the top of the warehouse for installation using a tower crane. The Bailey bridge on the top of the warehouse is installed using a tower crane. After the Bailey steel truss beam of one warehouse is completed, the installation of the next warehouse begins.

[0025] Preferably, the Bailey bridge includes two crossbars, with a connecting bracket fixed between them. At each end of the crossbar is a mounting sleeve and a mounting plate. When the two crossbars are assembled end-to-end, the mounting sleeve and mounting plate are inserted into each other. A slot is provided on the surface of the mounting plate, and a positioning block is inserted into the slot. The positioning block is inserted into the surface of the mounting sleeve. A baffle is slidably connected to the surface of the mounting sleeve, and the baffle presses and limits the positioning block.

[0026] Preferably, the assembly sleeve has an "H" shaped plate structure, with an opening in the middle of the assembly sleeve. The assembly plate is square, with slots on both the top and bottom surfaces of the assembly plate. The end of the assembly plate away from the crossbar has an inlet slope, with two inlet slopes arranged in a figure-eight pattern.

[0027] Preferably, the surface of the assembly sleeve has two through holes, which are symmetrically distributed about the through opening and are connected to it. The positioning block is movably inserted into the through hole, and the height of the positioning block is greater than the depth of the through hole. One end of the positioning block inserted into the through opening has a bevel, which faces away from the crossbar. The other end of the positioning block has a notch, which is an inverted "U" shaped groove. A boss is fixed on the top surface of the notch, and an elastic band is fixed on the surface of the boss. The two ends of the elastic band are respectively fixed on two parallel side walls of the through opening, and a pull strip is fixed on the surface of the notch.

[0028] Preferably, each of the two side plates of the assembly sleeve is provided with a sliding groove, and the two ends of the baffle are slidably connected in the two sliding grooves respectively. Each end of the baffle is provided with an insert groove, and a rubber strip is fixed on the surface of the insert groove. The thickness of the rubber strip is greater than the depth of the insert groove, and the rubber strip is clamped between the baffle and the sliding groove to produce elastic deformation. The surface of the baffle is provided with a pick-out groove.

[0029] Preferably, the surface of the baffle is fixed with a plurality of rubber strips two, which are arranged in a rectangular pattern. When the baffle is positioned between the plurality of rubber strips two, the baffle compresses and limits the positioning block.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] The proposed construction method for the roof slab of ultra-high, large-span silos utilizes a steel pipe lattice rigid platform. After sliding to the elevation of the lower edge of the highest reinforced concrete beam in the silo, the sliding is stopped. A temporary sliding formwork lifting frame is then fixed. The rigid platform is connected to the silo wall via embedded parts, and additional support is added to transfer the load borne by the platform to the silo wall. A Bailey bridge is erected at the top of the silo wall at the location of the reinforced concrete structural beam, serving as the main load-bearing component. Multiple Bailey bridges can be connected in parallel as needed, with the number determined by load calculations. The two ends of the Bailey bridge are fixed to the silo wall to form a simply supported structure, and diagonal supports are added to improve the stability of the components. The combined formwork support system consists of two independent load-bearing systems connected by connecting members, jointly bearing all construction loads. The rigid platform is a lattice-like structure, transferring the load to the silo wall through wall ties on the surrounding silo wall. It primarily bears uniformly distributed loads, including construction live loads and the self-weight of the silo roof slab. The Bailey truss steel beams are erected on the upper part of the silo wall and are continuous beams, mainly bearing large line loads. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the assembly panel structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the assembly structure of the present invention;

[0035] Figure 4 This is a top view of the assembly structure of the present invention;

[0036] Figure 5 for Figure 4 Cross-sectional view of the structure at point AA;

[0037] Figure 6 This is a schematic diagram of the baffle structure of the present invention;

[0038] Figure 7 This is a schematic diagram of the positioning insert structure of the present invention;

[0039] Figure 8 This is a schematic diagram of the assembly sleeve and elastic band connection structure of the present invention;

[0040] Figure 9 This is a schematic diagram of the connection structure between the two Bailey bridges of the present invention;

[0041] Figure 10 for Figure 8 Top view of the structure;

[0042] Figure 11 for Figure 10 Cross-sectional view of the structure at point BB;

[0043] Figure 12 for Figure 11 Enlarged schematic diagram of the structure at point A in the middle.

[0044] In the diagram: 1. Crossbar; 2. Connecting bracket; 3. Assembly sleeve; 4. Assembly plate; 5. Slot; 6. Positioning block; 7. Angled surface; 8. Notch; 9. Boss; 10. Elastic band; 11. Through hole; 12. Slide groove; 13. Baffle; 14. Embedding groove; 15. Rubber strip one; 16. Rubber strip two; 17. Picking groove; 18. Pulling strip. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Example 1

[0047] This invention provides a technical solution: a construction method for the roof slab of an ultra-high, large-span silo, the method comprising the following steps:

[0048] A. Leveling and reinforcement of the steel pipe truss inside the warehouse:

[0049] 1. Twenty-four hours after the top layer of reinforced concrete silo wall is poured, the slipform platform is secured. A crossbeam steel pipe is added to the top of the reinforced concrete silo wall, and a short steel pipe is used to connect the inner and outer outriggers and support rods of the lifting frame. Before reinforcement, the construction plan must be explained to the project managers at all levels, and then technical and safety instructions must be given to the actual construction personnel and foremen at each level.

[0050] 2. Remove the inner and outer slipform and surrounding rings of the warehouse wall, and add a vertical support pole on each of the inner and outer sides. The lower end of the pole is welded to the embedded part of the reinforced concrete warehouse wall, and the upper end is connected to the crossbeam steel pipe connecting the inner and outer lifting frame legs. The gap between the pole and the reinforced concrete of the warehouse wall is filled with wooden plugs. The intersection of the pole and the slipform rigid platform must be connected with fasteners.

[0051] 3. Steel pipe diagonal bracing: Rooted at the top and walls of the silo, steel pipe diagonal bracing is used to support the overall steel pipe truss at the position of each truss. The steel pipe diagonal bracing is evenly distributed along the perimeter of the silo wall, with 28 steel pipe diagonal bracings evenly distributed along the perimeter of the silo wall for each silo.

[0052] Steel truss cables: Made of 16mm diameter round steel in an "S" shape, one end is tied to the support climbing pole and welded firmly; the other end is tied to the bottom of the steel pipe truss and welded firmly. A total of 28 steel bars are used for connection in each section.

[0053] 4. Remove the jacks and their oil circuit system, and remove the upper and lower crossbeams of the lifting frame. At this point, the fixing of the slipform rigid platform is complete.

[0054] B. Establish platform support:

[0055] 1. Once the rigid slipform platform is in place and fixed, the reinforced concrete structure support for the warehouse roof can be erected using this as a support. In terms of construction sequence, the wall panel reinforcement should be tied first, the beam base slab should be laid, then the wall panel formwork should be erected, and finally the warehouse roof support should be erected.

[0056] 2. Once the rigid slipform platform is fixed, the wall panel reinforcement binding process can begin. Before binding the reinforcement, loose reinforced concrete at the top of the silo wall should be removed, and the construction joint surfaces and dust on the vertical reinforcement of the silo wall should be treated. Then, the wall panel reinforcement can be bound. Since a silo top ring beam is generally installed at the top of the silo wall, the main reinforcement bars of this ring beam are large in size and number, and there are also a large number of closed stirrups. Using flip-form construction here makes it easier to ensure construction quality.

[0057] 3. After the wall panel reinforcement is tied and inspected, the wall panel formwork should be erected promptly. This formwork can utilize slipform and walers. When the height of the main beam exceeds the length of the slipform, the slipform should be on top, with additional formwork hanging below to close it. When closing, care should be taken to avoid the connecting rods and supporting members at the lifting frame supports. Tie bolts should be installed on all wall panels to prevent the lateral pressure of the formwork from being transmitted to the roof formwork support system.

[0058] 4. Before erecting the platform support, the main beam formwork should be erected first. The platform support uprights should be as consistent as possible with the uprights of the slipform rigid platform, forming a lattice structure to further improve the overall rigidity of the platform.

[0059] C. Install Bailey bridge:

[0060] 1. Based on the Bailey bridge's positioning, the sections are first assembled on the ground in groups of 5, then transported to the top of the silo using a tower crane for installation. The Bailey bridge on the silo top is also installed using a tower crane. Installation proceeds only after the Bailey steel truss beams for one silo are completed. Bailey bridge sections should be assembled on the ground into equal-length truss sections according to the diameter of each silo before being hoisted onto the silo for assembly with other Bailey bridge sections. Therefore, the hoisting weight should be based on the weight of a single assembled Bailey bridge truss section for one silo. For a silo with a diameter of 12.5m, the weight of each hoisted Bailey bridge section is 13KN (5 sections).

[0061] After the silo is slide-lifted to the set elevation, concrete piers 500mm high, 200mm wider on each side than the Bailey bridge, and the same thickness as the silo wall are poured at the Bailey bridge erection location to support the Bailey bridge. The Bailey bridge is a composite truss structure made of standardized steel sections, using a standard size of 3 meters long * 1.5 meters high. Multiple double-section Bailey bridges are installed, with the silo's center line as the reference. The number of Bailey steel trusses is determined through modeling calculations. Upon arrival, the Bailey bridge sections must be inspected and only those that pass inspection can be used.

[0062] 3. The two bridge sections are arranged in parallel and their support points are firmly welded to the channel steel beams to ensure rigidity and stability. After the Bailey bridges inside the storage facility are installed and reinforced, the cantilevered sections at both ends are lifted by a tower crane to the cantilevered sections for installation, and an additional Bailey bridge is added along the length of the cantilevered sections. After the Bailey bridges are installed, they are aligned parallel to the main beams in the storage facility direction. The lower chord of the steel pipe truss is suspended using steel pipe couplers, with the steel pipes vertical. The distance between the steel pipe suspension points is controlled at approximately 1000mm, 1.5m from the storage facility wall. The steel pipe truss is suspended using two suspension steel pipes, and the suspension steel pipes are connected to the upper and lower chords of the truss using double couplers; double couplers are also used at the ends for anti-slip.

[0063] 4. After the Bailey steel truss beam is installed, the connecting rods between the Bailey truss beam and the slipform rigid platform can be installed. The connecting rods should be set in the same module as the Bailey steel truss, and are usually made of scaffold steel pipes. Their lower ends should be connected to the upper and lower chords of the slipform rigid platform truss, and as close to the nodes as possible. When they cannot be connected to the nodes, they should be connected to the nodes of the truss by adding diagonal braces.

[0064] D. Beam formwork installation:

[0065] 1. Beam formwork process sequence

[0066] Confirm beam location → Determine vertical elevation → Longitudinal joists → Transverse joists → Bottom formwork → Side formwork → Diagonal bracing (lay through-beam pipes) → (Install tie bolts) → Elevation and axis verification → Reinforcement and adjustment.

[0067] 2-beam formwork matching

[0068] 1) Beam formwork: Beam formwork is made of plywood of the same size as the beam.

[0069] 2) Supporting wood: The supporting wood is made of 40mm x 90mm square timber.

[0070] 3) Tie bolts: One set of tie bolts should be installed, positioned 250-300mm from the bottom formwork of the beam.

[0071] 4) Horizontal joists: The horizontal joists of the beams are made of 40mm×90mm square timber, with a spacing of 200mm-300mm.

[0072] 3. According to the design requirements, when placing the bottom slab of the beam, first determine the elevation point, then level it on all four sides of the silo. After the bottom slab of the beam is determined, erect one side of the beam slab along the bottom slab, tie the beam reinforcement, and finally erect the formwork for the other side of the beam slab.

[0073] E. Tying reinforcing bars:

[0074] Before tying reinforcing bars, the drawings should be thoroughly reviewed, and the foreman should brief the workers on the process, verifying the steel material labels and the shape, dimensions, and diameter of the finished reinforcing bars. During installation and tying, the grade, diameter, number, spacing, and location of the reinforcing bars, as well as the specifications, quantity, and location of embedded parts, must meet design requirements. The type and location of reinforcing bar joints, the quantity of reinforcing bars in the same cross-section, and the lap length must meet specifications. The reinforcing bars must be securely tied, clean, and free from contamination. After the protective layer for the stressed reinforcing bars is correctly installed, the supporting frame should be lowered into place, and the bidirectional moving brackets, fixed brackets, and tracks used for the supporting frame construction should be removed.

[0075] F. Concrete pouring:

[0076] 1 Concrete mix proportions

[0077] Ready-mixed concrete was used, and the mix design was provided to the site by the concrete supplier before concrete pouring. Concrete test blocks were also left on site.

[0078] 2. Concrete pouring sequence and machinery input

[0079] The concrete pouring plan for the warehouse roof slab will be carried out in two stages. The first stage will be the pouring of the warehouse roof beams, and the second stage will be the pouring of the warehouse roof slab, using pumped concrete.

[0080] G. Removal of formwork, Bailey bridges, and trusses:

[0081] The support frame for the main beam can only be removed after the concrete strength reaches 100%. This is especially true for the formwork supports corresponding to the main beam; the entire support frame can only be removed after the concrete strength reaches 100%. All formwork removal can only proceed after the test blocks have reached the specified strength and have been approved by the supervising company.

[0082] 2. The demolition process should ensure the safety of the structure after demolition, and follow the principles of demolishing the last installed parts first and the inside first and the outside last, and formulate a demolition procedure accordingly.

[0083] 3. The demolition process involves lowering the entire structure to the ground and then dismantling it. The standard demolition procedure is as follows:

[0084] 1) Removal of formwork and supports for inner and outer silo walls and roof, and repair of reinforced concrete exterior walls. First, remove the formwork for the cylinder walls and roof, and transport the dismantled materials to the roof and then hoist them to the ground. At the same time, repair the reinforced concrete inside and outside the silo walls, especially the outer silo walls, keeping the joints as smooth and aesthetically pleasing as possible.

[0085] 2) Bailey Bridge truss dismantling. Dismantling will be carried out in the reverse order of the original assembly process. Each warehouse will be dismantled as a unit, dismantling each warehouse individually. After being broken down into Bailey bridge truss sections, the entire structure will be hoisted to the ground, and then the remaining sections will be disassembled again. During dismantling, measures should be taken to maintain the stability of the remaining Bailey bridge truss sections.

[0086] 3) Dismantle the inner slipform platform. After the Bailey steel truss beams are dismantled, the original connecting rods should first be fixed to the top plate of the silo with short steel pipes. Then, the connection between the silo top and the connecting rods should be removed, and the support and connection between the slipform rigid platform and the silo wall should be disconnected. Four lifting points should be set up for each silo. Then, the connection between the silo top and the connecting rods should be removed, and the slipform rigid platform should be lowered to the bottom of the silo in sections using 5-ton electric hoists.

[0087] 4) Dismantle the external slipform platform. Reinforcement should be carried out before dismantling. The dismantling should be divided into sections based on the warehouse area. The length of each dismantling section should not exceed 8m of the arc length. The external platform truss can only be dismantled after each dismantling section and any adjacent sections have been reinforced.

[0088] Example 2

[0089] Based on Embodiment 1, a rapid assembly structure between Bailey bridge frames is proposed as follows: The Bailey bridge frame includes two crossbars 1, and a connecting bracket 2 is fixed between the two crossbars 1. An assembly sleeve 3 and an assembly plate 4 are fixed at both ends of the crossbars 1 respectively. When the two crossbars 1 are assembled end to end, the assembly sleeve 3 and the assembly plate 4 are inserted together. The assembly sleeve 3 has an "H" shaped plate structure and an opening in the middle. The assembly plate 4 is a square plate. The top and bottom surfaces of the assembly plate 4 are provided with slots 5. The end of the assembly plate 4 away from the crossbars 1 is provided with an inlet slope. There are two inlet slopes, which are arranged in a figure-eight shape. The surface of the assembly plate 4 is provided with slots 5, and a positioning block 6 is inserted into the inside of the slots 5. The positioning block 6 is inserted into the surface of the assembly sleeve 3.

[0090] Two through holes 11 are opened on the surface of the assembly kit 3. The two through holes 11 are symmetrically distributed about the through opening and are connected to the through opening. The positioning block 6 is movably inserted into the through hole 11. The height of the positioning block 6 is greater than the depth of the through hole 11. One end of the positioning block 6 inserted into the through opening has a bevel 7. The bevel 7 faces away from the crossbar 1. The other end of the positioning block 6 has a notch 8. The notch 8 is an inverted "U" shaped groove. A boss 9 is fixed on the top surface of the notch 8. An elastic band 10 is fixed on the surface of the boss 9. The two ends of the elastic band 10 are respectively fixed on two parallel side walls of the through hole 11. A pull strip 18 is fixed on the surface of the notch 8.

[0091] A baffle plate 13 is slidably connected to the surface of the assembly sleeve 3. The baffle plate 13 presses and limits the positioning insert 6. Slide grooves 12 are provided on both side plates of the assembly sleeve 3. The two ends of the baffle plate 13 are slidably connected in the two slide grooves 12 respectively. An insert groove 14 is provided on both ends of the baffle plate 13. A rubber strip 15 is fixed on the surface of the insert groove 14. The thickness of the rubber strip 15 is greater than the depth of the insert groove 14. The rubber strip 15 is clamped between the baffle plate 13 and the slide groove 12 and undergoes elastic deformation. A scooping groove 17 is provided on the surface of the baffle plate 13. Multiple rubber strips 16 are fixed on the surface of the baffle plate 13. The multiple rubber strips 16 are arranged in a rectangular shape. When the baffle plate 13 is between the multiple rubber strips 16, the baffle plate 13 presses and limits the positioning insert 6.

[0092] In actual use, when assembling two Bailey frames, a finger is inserted into the latching groove 17, and the baffle 13 is moved to slide along the slide groove 12 until the baffle 13 and the positioning block 6 are misaligned, that is, the baffle 13 no longer obstructs the other end of the positioning block 6. At this time, the elastic band 10 is in its initial state. The assembly plate 4 of one Bailey frame is inserted into the central opening of the assembly sleeve 3 of the other Bailey frame. As the assembly plate 4 is pushed into the opening, it pushes the positioning block 6 along the inclined surface 7. The positioning block 6 stretches the elastic band 10, causing it to deform elastically until... After the assembly plate 4 is fully inserted into the through slot, the slot 5 and the positioning block 6 are opposite each other. At this time, the elastic band 10 rebounds and drives the positioning block 6 to reset. One end of the positioning block 6 is inserted into the slot 5, completing the rapid assembly of the two Bailey frames. In order to prevent the two connected Bailey frames from loosening, the baffle 13 is moved to block the other end of the positioning block 6, ensuring that one end of the positioning block 6 is always inserted into the slot 5. In addition, the addition of rubber strip 15 and rubber strip 16 increases the sliding friction of the baffle 13, that is, the baffle 13 will not slide when there is no external force to move it.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for constructing the roof slab of an ultra-high, large-span silo, characterized in that: The method includes the following steps: The steel pipe truss inside the warehouse was leveled and reinforced. Twenty-four hours after the top layer of the warehouse wall was poured with reinforced concrete, the slip frame was fixed, the slip frame templates and enclosures of the inner and outer warehouse walls were removed, the truss was anchored at the top and walls of the warehouse, and the overall steel pipe truss was supported by steel pipe diagonal braces at each frame position. Erect platform supports. After the slipform rigid platform is in place and fixed, erect the reinforced concrete structure supports for the top of the silo. After the slipform rigid platform is fixed, proceed with the wall panel reinforcement binding process. After the wall panel reinforcement binding is completed and accepted, promptly erect the wall panel formwork. Before erecting platform supports, erect the main beam formwork first. Install the Bailey bridge. Based on the Bailey bridge's positioning, use a tower crane to transport it to the top of the silo for installation. After the silo is slipformed to the set elevation, pour concrete piers at the Bailey bridge's erection position to support it. After the Bailey truss beams are installed, install the connecting rods between the Bailey truss beams and the slipform rigid platform. When installing the beam formwork, according to the design requirements, first determine the elevation point when placing the beam bottom plate, then level it on all four sides of the silo. After the beam bottom plate is determined, erect one side of the beam slab along the beam bottom plate, tie the beam reinforcement, and finally erect the other side of the beam slab. Tie the reinforcing bars to ensure that the grade, diameter, number, spacing, and location of the reinforcing bars, as well as the specifications, quantity, and location of the embedded parts, meet the design requirements; The concrete pouring for the warehouse roof slab is planned to be carried out in two stages: first, the roof beam will be poured, and second, the roof slab will be poured, using pumped concrete. The formwork, Bailey bridge, and truss were dismantled, and the support frame for the main beams could only be removed after the concrete strength reached 100%. The specific steps for installing the Bailey bridge include: After the five-piece assembly is completed on the ground, it is transported to the top of the warehouse for installation using a tower crane. The Bailey bridge on the top of the warehouse is installed using a tower crane. After the Bailey steel truss beam of one warehouse is completed, the installation of the next warehouse begins. The Bailey bridge includes two crossbars (1), and a connecting bracket (2) is fixed between the two crossbars (1). The two ends of the crossbars (1) are respectively fixed with an assembly sleeve (3) and an assembly plate (4). When the two crossbars (1) are assembled end to end, the assembly sleeve (3) and the assembly plate (4) are inserted together. The surface of the assembly plate (4) is provided with a slot (5). A positioning block (6) is inserted into the slot (5). The positioning block (6) is inserted into the surface of the assembly sleeve (3). A baffle (13) is slidably connected to the surface of the assembly sleeve (3). The baffle (13) presses and limits the positioning block (6). The assembly sleeve (3) has an "H" shaped plate structure. The middle part of the assembly sleeve (3) has an opening. The assembly plate (4) is a square plate. The top and bottom surfaces of the assembly plate (4) are provided with slots (5). The end of the assembly plate (4) away from the crossbar (1) is provided with an inlet slope. There are two inlet slopes, which are arranged in a figure-eight shape. The surface of the assembly sleeve (3) has two through holes (11), which are symmetrically distributed about the through opening and are connected to the through opening. The positioning block (6) is movably inserted into the through hole (11). The height of the positioning block (6) is greater than the depth of the through hole (11). One end of the positioning block (6) inserted into the through opening has a bevel (7) facing away from the crossbar (1). The other end of the positioning block (6) has a notch (8), which is an inverted "U" shaped groove. The top surface of the notch (8) is fixed with a boss (9). The surface of the boss (9) is fixed with an elastic band (10). The two ends of the elastic band (10) are respectively fixed on two parallel side walls of the through hole (11), and the surface of the notch (8) is fixed with a pull strip (18).

2. The construction method for the roof slab of an ultra-high, long-span silo according to claim 1, characterized in that: The specific operations for leveling and reinforcing the steel pipe truss inside the warehouse include: A crossbeam steel pipe is added to the top of the reinforced concrete silo wall. A short steel pipe is used to connect the inner and outer legs and support rods of the lifting frame. Before reinforcement, the construction plan is explained to the project leaders at all levels, and then the technical and safety instructions are given to the actual construction personnel and foremen at each level. Add a vertical support pole on both the inner and outer sides. The lower end of the pole is welded to the embedded part of the reinforced concrete silo wall, and the upper end is connected to the crossbeam steel pipe that connects the inner and outer lifting frame legs. The gap between the pole and the reinforced concrete silo wall is filled with wooden plugs. The intersection of the pole and the rigid platform of the slipform is connected with fasteners. The steel pipe diagonal braces are evenly arranged along the perimeter of the silo wall, with 28 steel pipe diagonal braces per silo. The jacks and their oil circuit system are removed, the upper and lower crossbeams of the lifting frame are removed, and the sliding formwork rigid platform is fixed.

3. The construction method for the roof slab of an ultra-high, large-span silo according to claim 1, characterized in that: The specific operations for setting up the platform support include: First, tie the wall panel reinforcement bars and lay the beam base plate, then erect the wall panel formwork, and finally set up the warehouse roof support. Before binding the reinforcing bars, loose reinforced concrete on the top of the silo wall should be removed, and the joint surfaces of the construction joints and the dust on the vertical reinforcing bars of the silo wall should be treated before binding the wall panel reinforcing bars. When the height of the main beam exceeds the length of the slipform, the slipform should be placed on top and another formwork should be hung at the bottom to close it. When closing, care should be taken to avoid the connecting rods and support rods at the lifting frame support. Tie bolts should be installed on all wall panels to prevent the side pressure of the formwork from being transmitted to the top formwork support system. The platform support poles should be consistent with the sliding formwork rigid platform poles and form a lattice structure to further improve the overall rigidity of the platform.

4. The construction method for the roof slab of an ultra-high, long-span silo according to claim 1, characterized in that: The two side plates of the assembly sleeve (3) are provided with sliding grooves (12). The two ends of the baffle (13) are slidably connected in the two sliding grooves (12). The two ends of the baffle (13) are provided with embedding grooves (14). A rubber strip (15) is fixed on the surface of the embedding groove (14). The thickness of the rubber strip (15) is greater than the depth of the embedding groove (14). The rubber strip (15) is clamped between the baffle (13) and the sliding groove (12) and undergoes elastic deformation. The surface of the baffle (13) is provided with a scooping groove (17).

5. The construction method for the roof slab of an ultra-high, long-span silo according to claim 1, characterized in that: The surface of the baffle (13) is fixed with multiple rubber strips (16), which are arranged in a rectangular pattern. When the baffle (13) is between the multiple rubber strips (16), the baffle (13) squeezes and limits the positioning block (6).

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