Construction method of prefabricated prestressed concrete silo

Abstract

The invention discloses a method for constructing an assembled prestressed concrete silo, comprising the following construction steps: S1: prefabricate silo wall panels in a factory; A1.1: manufacture according to design drawings; A1.2: prepare templates required for silo wall panels; A1.3: assemble templates; A1.4: weld common steel bars and embedded parts, close the molds, reserve holes for concrete pouring and vibrate holes; A1.5: pour concrete; A1.6: remove the molds and trim the outer surface of the components, and transport them to the site; S2. install the silo wall panels on site; A2.1: construct vertical Anchor the bottom of the prestressed steel strands; A2.2: Install the wall panels one by one, and pass the prestressed steel strands through the reserved holes in the wall panels; A2.3: Weld the welds between the wall panels; and pressure grout the tongue-and-groove joints at the same time; A2.4: Install several horizontal annular wall panels, construct the external annular prestressed steel strands, and complete the anchoring; A2.5: After the wall panels are installed one by one, tension the vertical prestressed steel strands and anchor them; A2.6: Cover the outer steel pipe or weld the closed angle steel, channel steel and split steel pipe; A2.7: Complete the construction and installation of the silo wall panels.

Description

Technical Field

[0001] The invention relates to the technical field of building component construction, and in particular to a method for constructing an assembled prestressed concrete silo. Background Art

[0002] In the field of industrial storage, silo structures are widely used due to their practicality, including steel plate (metal siding) silos and reinforced concrete silos. The silo structure is usually composed of a silo roof, a silo body, and a lower part of the silo. The design and construction method of the silo body structure have a decisive influence on the safety and economy of the silo. At present, the reinforced concrete silo body is mainly constructed by on-site slipform casting. The advantage of this method is that it can achieve rapid and continuous pouring of concrete, thereby ensuring the integrity and stability of the silo body structure. According to expert research, slipform construction technology can significantly improve construction efficiency, reduce the generation of cold joints, and have a positive impact on the quality and crack resistance of the silo body.

[0003] However, slipform construction technology also has some shortcomings. For example, there are many wet operations on site, which limits construction efficiency; it has high requirements for construction technology; it has high initial investment costs; it has high requirements for construction continuity; it has high construction safety risks; and it has high requirements for environmental adaptability.

[0004] In order to solve the above problems, there is an urgent need for a prefabricated prestressed concrete silo construction method that can effectively improve construction efficiency, improve difficulties in the construction process, reduce investment costs, reduce construction risks, reduce dependence on the environment, and ensure the safety and economy of the silo structure. Summary of the invention

[0005] In view of this, the present invention provides a method for constructing an assembled prestressed concrete silo, which can effectively improve construction efficiency, improve difficulties in the construction process, reduce investment costs, reduce construction risks, and reduce dependence on the environment, thereby further ensuring the safety and economy of the silo body structure.

[0006] The present invention provides a method for constructing an assembled prestressed concrete silo using the following technical solutions:

[0007] A method for constructing an assembled prestressed concrete silo comprises the following construction steps:

[0008] S1: Prefabricated factory prefabricated silo siding:

[0009] A1.1: Produce surrounding embedded angle steel, embedded steel plate, ordinary steel bar, corrugated pipe, prestressed steel strand and prestressed steel strand anchor according to the design drawings;

[0010] A1.2: Prepare the templates required for the silo wall panels according to the design drawings;

[0011] A1.3: Assemble formwork, install steel bars, and arrange corrugated pipes and embedded parts;

[0012] A1.4: Welding of common steel bars and embedded parts, mold closing, reserved concrete pouring and vibrating holes;

[0013] A1.5: Pour concrete, vibrate and compact it, and maintain the wall panel components;

[0014] A1.6: Remove the formwork, trim the outer surface of the components, and transport them to the site;

[0015] S2. On-site installation of silo wall panels:

[0016] A2.1: On-site construction of foundation, reserved connection grooves, and construction of bottom anchorage of vertical prestressed steel strands;

[0017] A2.2: Install the wall panels one by one, and pass the prestressed steel tendons through the reserved holes in the wall panels;

[0018] A2.3: Weld the welds between the wall panels and grind them smooth; at the same time, pressure grout the tongue-and-groove joints;

[0019] A2.4: Install several horizontal annular wall panels, construct external annular prestressed steel strands, and complete anchoring;

[0020] A2.5: After the wall panels are installed one by one, the vertical prestressed steel strands are tensioned and anchored; the adjacent wall panels are installed alternately;

[0021] A2.6: Construction of external prestressed steel tendon protection measures, outer jacket steel pipe or welding closed angle steel, channel steel and split steel pipe;

[0022] A2.7: Check the connection measures at the on-site assembly location and complete the construction and installation of the entire silo wall panel.

[0023] Optionally, the silo body includes silo wall panels, prestressed steel bundles and prestressed anchor supports. The silo wall panels are precast reinforced concrete wall panels. The horizontal dimensions of the precast reinforced concrete wall panels are evenly divided into n sections according to the diameter of the silo, and the vertical height dimension is greater than 2 meters. The silo wall panels are provided with horizontal prestressed steel bundles in the horizontal direction according to the stress conditions of the silo.

[0024] Optionally, the silo wall panels are in a plane arc shape or a straight line shape, and a plurality of wall panels are assembled into a circular or polygonal structure.

[0025] Optionally, the silo wall panels include horizontal panels and vertical panels, and the horizontal panels and vertical panels adopt wall panel grooves and wall panel tenon structures, and the horizontal panels and vertical panels of the silo wall panels are interlocked and connected with each other through the wall panel grooves and wall panel tenon structures.

[0026] Optionally, grouting holes are provided on the edges of the wall panel grooves for bite-fit grouting connections.

[0027] Optionally, the horizontal prestressed steel strands of the silo wall panels are tensioned as a whole in sections in the horizontal direction.

[0028] Optionally, angle steel is pre-embedded on the edge of the silo wall panel, and chamfering and grinding grooves are performed at the edge points or intersection points of the limbs of the angle steel for later assembly and welding connection.

[0029] Optionally, the horizontal reinforcement and vertical reinforcement of the silo wall plate are welded to the angle steel, and the perforation plug welding is performed, and the outer surface is polished flat and smooth after welding.

[0030] Optionally, at least two post-tensioned prestressed tendon holes or corrugated steel pipes may be provided in the silo wall panel in the vertical direction. After the prestressed steel strands are tensioned and the prestressed steel strands at the top of the silo wall panel are anchored, grouting is performed in the post-tensioned prestressed tendon holes or corrugated steel pipes.

[0031] Optionally, embedded steel plates are arranged along the annular direction of the prestressed steel bundle. After the prestressed steel bundle is tensioned and the steel bundle is anchored at the prestressed anchor support, the prestressed steel bundle is covered with a steel pipe or closed angle steel, channel steel and / or split steel pipe are welded.

[0032] In summary, the present invention includes at least one of the following beneficial technical effects: it not only improves construction efficiency and safety, but also reduces construction difficulty and cost, while ensuring the quality and economy of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0035] Figure 2 is a top view of an embodiment of the present invention;

[0036] Figure 3 is a schematic diagram of the silo wall panel structure of an embodiment of the present invention;

[0037] Figure 4 It is a schematic diagram of the connection structure of the silo wall panel, horizontal prestressed steel bundles, protective steel and prestressed anchor supports according to an embodiment of the present invention.

[0038] Explanation of the accompanying drawings: 1. Silo foundation; 2. Silo wall panel; 2a. Wall panel groove; 2b. Wall panel tenon; 3. Connecting weld; 4. Vertical prestressed steel strand; 5. Horizontal prestressed steel strand; 6. Angle steel; 7. Grouting hole; 8. Ordinary steel bar; 9. Prestressed anchor support. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0040] The following is combined with Figure 1-4 The present invention is described in further detail.

[0041] The embodiment of the present invention discloses a method for constructing an assembled prestressed concrete silo. Figure 1 , Figure 2 , Figure 3 , Figure 4 , a method for constructing an assembled prestressed concrete silo, comprising the following construction steps:

[0042] S1: Prefabricated factory prefabricated silo wall panel 2:

[0043] A1.1: According to the design drawings, make the surrounding embedded angle steel 6, embedded steel plate, ordinary steel bar 8, corrugated pipe, prestressed steel bundle and prestressed steel bundle anchors; according to the design drawings, accurately make the embedded angle steel 6, embedded steel plate, ordinary steel bar 8 and other components required for the silo wall panel 2, make corrugated pipe and prestressed steel bundle, and corresponding anchors to ensure that the prestressed system can be correctly installed and function.

[0044] A1.2: Prepare the template required for silo wall panel 2 according to the design drawings; prepare the template suitable for the shape of silo wall panel 2 according to the requirements of the design drawings, and ensure that the size, shape and accuracy of the template meet the design requirements.

[0045] A1.3: Assemble the formwork, install the steel bars, and arrange the corrugated pipes and embedded parts; Assemble the formwork to form the shape of the silo wall panel 2, install ordinary steel bars 8 in the formwork, ensure that the position, quantity and spacing of the steel bars meet the design requirements, arrange the corrugated pipes and embedded parts, and ensure that they are accurately positioned so that they can be correctly fixed during the subsequent pouring of concrete.

[0046] A1.4: Welding of ordinary steel bars 8 and embedded parts, closing the mold, and reserving holes for concrete pouring and vibrating; Welding of ordinary steel bars 8 and embedded parts to ensure a firm connection between them, closing the mold, i.e. closing the formwork, preparing to pour concrete, and reserving holes for concrete pouring and vibrating so that subsequent pouring and vibrating of concrete can proceed smoothly.

[0047] A1.5: Pour concrete, vibrate and compact it, and maintain the wall panel components; pour the concrete into the formwork to ensure that the concrete is evenly distributed, vibrate the concrete with a vibrator to ensure that the concrete is dense and free of bubbles, and maintain the poured wall panel components to ensure that the concrete reaches the design strength.

[0048] A1.6: Remove the formwork and trim the outer surface of the component, and transport it to the site; when the concrete reaches the design strength, remove the formwork, trim the outer surface of the siding component to ensure that the surface is smooth and flat, and transport the trimmed siding component to the site for installation1.

[0049] S2. On-site installation of silo wall panel 2:

[0050] A2.1: On-site foundation construction, reserved connection grooves, and bottom anchoring of vertical prestressed steel strands 4. When constructing the foundation of the silo wall panels 2 on site, reserved the grooves for connecting the wall panels, and at the same time, performed the bottom anchoring of the vertical prestressed steel strands 4 to prepare for the subsequent application of prestress;

[0051] A2.2: Install the wall panels one by one, and pass the prestressed steel strands through the reserved holes of the wall panels. During the installation process, pass the prestressed steel strands through the reserved holes of the wall panels to facilitate subsequent prestressing;

[0052] A2.3: Weld the welds between the wall panels and grind them smooth; at the same time, pressure grouting is performed at the tongue-and-groove joints; after the wall panels are installed, weld the welds between the wall panels to ensure a firm connection. After welding, grind the welds to make their surface smooth and flat.

[0053] A2.4: Install several (one or more) horizontal annular wall panels, construct external annular prestressed steel strands, and complete anchoring. Install several horizontal annular wall panels on the silo wall panel 2 to enhance the overall stability of the silo, construct external annular prestressed steel strands, and complete anchoring.

[0054] A2.5: After the wall panels are installed one by one, the vertical prestressed steel bundles 4 are tensioned and anchored; the adjacent wall panels are installed alternately; as the wall panels are installed one by one, the vertical prestressed steel bundles 4 are tensioned and anchored. The adjacent wall panels need to be installed alternately to ensure the integrity and stability of the silo wall panel 2.

[0055] A2.6: Take protective measures for the external prestressed steel strands, such as outer jacket steel pipes or welding closed angle steels 6, channel steels and split steel pipes. These protective measures can prevent the prestressed steel strands from being corroded and damaged by the external environment and extend their service life.

[0056] A2.7: Check the connection measures at the on-site assembly location and complete the construction and installation of the entire silo wall panel 2.

[0057] Among them, the welds between the welded wall panels in A2.2 refer to the connecting welds 3 between the vertical panels and the horizontal panels of the wall panels.

[0058] By adopting the above-mentioned construction method and the post-tensioning prestressing technology, the construction efficiency is improved, the construction difficulty is reduced, the requirements for the environment are reduced, and the force transmission is optimized, thereby ensuring the force safety and economy of the silo body structure and realizing fast and efficient construction. The present invention provides a silo construction solution with a safe structure, economy and simple construction, which reduces on-site wet operations, reduces construction difficulty, reduces environmental requirements, and more effectively transmits the force on the silo body, thereby further ensuring the performance of the silo body structure in terms of force safety and economy.

[0059] The silo body includes a silo wall panel 2, a prestressed steel bundle and a prestressed anchor support 9. The silo wall panel 2 is a prefabricated reinforced concrete wall panel. The horizontal dimension of the prefabricated reinforced concrete wall panel is divided into n sections according to the diameter of the silo, and the vertical height dimension is greater than 2 meters. The silo wall panel 2 is provided with a horizontal prestressed steel bundle in the horizontal direction according to the stress condition of the silo. In this embodiment, the silo has a diameter of 20m and a height of 30m. The horizontal direction can be divided into 20 sections and the height is divided into 15 sections.

[0060] In this embodiment, the silo wall panel 2 is installed on the silo foundation 1 .

[0061] The silo wall panel 2 is in a plane arc shape or a straight line shape, and a plurality of wall panels are assembled into a circular or polygonal structure.

[0062] The silo wall panels 2 include horizontal panels and vertical panels, which adopt wall panel grooves 2a and wall panel tenon 2b structures, and the horizontal panels and vertical panels of the silo wall panels 2 are interlocked and connected with each other through the wall panel grooves 2a and wall panel tenon 2b structures.

[0063] The wall panel groove 2a is provided with a grouting hole 7 for grouting connection. Specifically, the grouting hole 7 is D50@500, and the grouting hole 7 is about 150 mm away from the board edge.

[0064] The horizontal prestressed steel strands 5 of the silo wall panel 2 are tensioned as a whole in sections in the horizontal direction.

[0065] Angle steel 6 is pre-embedded on two sides of the silo wall panel. Thick angle steel 6 is used. Chamfering and beveling are performed on the ridge points or the intersection points of the limbs of the angle steel 6 for later assembly and welding connection.

[0066] The horizontal and vertical steel bars of the silo wall panel 2 are welded to the angle steel 6 and are plug-welded. After welding, the outer surface is polished to be flat and smooth.

[0067] At least two post-tensioned prestressed tendon holes or corrugated steel pipes can be arranged in the vertical direction of the silo wall panel 2. After the prestressed steel strands are tensioned and the prestressed steel strands at the top of the silo wall panel 2 are anchored, grouting is performed in the post-tensioned prestressed tendon holes or corrugated steel pipes.

[0068] The prestressed steel bundle is provided with embedded steel plates along the annular direction. After the prestressed steel bundle is tensioned and the steel bundle is anchored at the prestressed anchor support 9, the prestressed steel bundle is covered with a steel pipe or a closed angle steel 6, a channel steel and / or a split steel pipe is welded.

[0069] This solution takes the case of a silo with a large diameter and height as an example. During implementation, the construction method of the present invention not only improves construction efficiency and safety, but also reduces construction difficulty and cost, while ensuring the quality and economy of the structure, and at the same time improves the structural connection strength, thereby improving the reliability of the overall structure.

[0070] In addition, when the diameter and height of the silo are small, the vertical prestressed steel bundle 4 and the horizontal prestressed steel bundle 5 can be cancelled, or only the vertical prestressed or horizontal prestressed steel bundle 5 can be used. The assembled silo body can also be completed, which improves construction efficiency and safety, reduces construction difficulty and cost, ensures the quality and economy of the structure, and improves the structural connection strength.

[0071] The silo construction method of the present invention realizes the rapid and efficient construction of the silo wall structure by prefabricating the silo wall panels 2 in the factory, assembling them on site, welding them on site, grouting the joints, and constructing and anchoring the prestressed steel bundles.

[0072] The present invention not only improves construction efficiency and safety, but also reduces construction difficulty and cost through prefabricated construction method and post-tensioning prestressing technology, while ensuring the quality and economy of the structure. This is mainly reflected in the following aspects:

[0073] 1) Improve construction efficiency: By prefabricating the silo wall panels 2 in the factory and assembling them on site, wet work on site is reduced, the construction process is simplified, and thus the construction efficiency is improved;

[0074] 2) Reduce construction difficulty: The use of post-tensioning prestressing technology reduces the dependence on technology and equipment during the construction process, thus alleviating the construction difficulty;

[0075] 3) Reduce environmental requirements: Since wet work on site is reduced, the requirements for environmental humidity, temperature and other conditions are reduced, so that construction can be carried out under a wider range of environmental conditions;

[0076] 4) Improve structural safety: By optimizing the design scheme, the force on the silo body is more effectively transmitted, thus enhancing the stress safety of the silo body structure;

[0077] 5) Economical: The prefabrication and assembly methods reduce material waste. At the same time, due to the simplification of construction steps, the construction cost is reduced and the economical efficiency is improved;

[0078] 6) Structural optimization: The design of the silo wall panel 2 includes the overall silo wall design and the hoisting and connection design of a single wall panel. This comprehensive design method can better adapt to different construction conditions and requirements;

[0079] 7) Improved connection strength: The connection between the wall panels adopts a groove and tenon structure, and is grouting through pressure grouting holes, which enhances the strength and stability of the connection;

[0080] 8) Flexibility of prestressed construction: Silo wall panels 2 can be flexibly set with prestressed steel strands according to the stress conditions, which can effectively transfer loads in both vertical and horizontal directions;

[0081] 9) Rapid construction: The entire construction process includes factory prefabrication, on-site assembly, welding, grouting, and prestressed steel strand construction and anchoring, which enables the rapid construction of the silo wall structure;

[0082] 10) Quality Control: Factory-prefabricated siding panels can undergo strict quality control within the factory to ensure the quality of each component, thereby improving the reliability of the overall structure.

[0083] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A method for constructing an assembled prestressed concrete silo, characterized in that: The construction steps include: S1: Prefabricated factory prefabricated silo siding: A1.1: Produce surrounding embedded angle steel, embedded steel plate, ordinary steel bar, corrugated pipe, prestressed steel strand and prestressed steel strand anchor according to the design drawings; A1.2: Prepare the templates required for the silo wall panels according to the design drawings; A1.3: Assemble formwork, install steel bars, and arrange corrugated pipes and embedded parts; A1.4: Welding of common steel bars and embedded parts, mold closing, reserved concrete pouring and vibrating holes; A1.5: Pour concrete, vibrate and compact it, and maintain the wall panel components; A1.6: Remove the formwork, trim the outer surface of the component, and transport it to the site; S2. On-site installation of silo wall panels: A2.1: On-site construction of foundation, reserved connection grooves, and construction of bottom anchorage of vertical prestressed steel strands; A2.2: Install the wall panels one by one, and pass the prestressed steel tendons through the reserved holes in the wall panels; A2.3: Weld the welds between the wall panels and grind them smooth; at the same time, pressure grout the tongue-and-groove joints; A2.4: Install several horizontal annular wall panels, construct external annular prestressed steel strands, and complete anchoring; A2.5: After the wall panels are installed one by one, the vertical prestressed steel strands are tensioned and anchored; the adjacent wall panels are installed alternately; A2.6: Construction of external prestressed steel tendon protection measures, outer jacket steel pipe or welding closed angle steel, channel steel and split steel pipe; A2.7: Check the connection measures at the on-site assembly location and complete the construction and installation of the entire silo wall panel.

2. The method for constructing an assembled prestressed concrete silo according to claim 1, characterized in that: The silo body includes silo wall panels, prestressed steel bundles and prestressed anchor supports. The silo wall panels are precast reinforced concrete wall panels. The horizontal dimensions of the precast reinforced concrete wall panels are divided into n sections according to the diameter of the silo, and the vertical height dimension is greater than 2 meters. The silo wall panels are provided with horizontal prestressed steel bundles in the horizontal direction according to the stress conditions of the silo.

3. The method for constructing an assembled prestressed concrete silo according to claim 2, characterized in that: The silo wall panels are flat arc-shaped or straight-line-shaped, and multiple wall panels are assembled into a circular or polygonal structure.

4. The method for constructing an assembled prestressed concrete silo according to claim 2, characterized in that: The silo wall panels include horizontal panels and vertical panels, which adopt wall panel grooves and wall panel tenon structures, and the horizontal panels and vertical panels of the silo wall panels are interlocked and connected with each other through the wall panel grooves and wall panel tenon structures.

5. The method for constructing an assembled prestressed concrete silo according to claim 4, characterized in that: Grouting holes are provided on the sides of the wall panel grooves for bite-joined grouting connections.

6. The method for constructing a prefabricated prestressed concrete silo according to claim 2, characterized in that: The horizontal prestressed steel strands of the silo wall panels are tensioned as a whole in sections in the horizontal direction.

7. The method for constructing an assembled prestressed concrete silo according to claim 2, characterized in that: Angle steel is pre-embedded on the edge of the silo wall panel, and the chamfered and polished grooves are located at the edge points or intersection points of the limbs of the angle steel for later assembly and welding connection.

8. The method for constructing a prefabricated prestressed concrete silo according to claim 7, characterized in that: The horizontal and vertical steel bars of the silo wall are welded to the angle steel and plug-welded. After welding, the outer surface is polished flat and smooth.

9. The method for constructing an assembled prestressed concrete silo according to claim 2, characterized in that: At least two post-tensioned prestressed tendon holes or corrugated steel pipes can be arranged in the vertical direction of the silo wall panel. After the prestressed steel strands are tensioned and the prestressed steel strands at the top of the silo wall panel are anchored, grouting is performed in the post-tensioned prestressed tendon holes or corrugated steel pipes.

10. The method for constructing a prefabricated prestressed concrete silo according to claim 9, characterized in that: The prestressed steel bundle is provided with embedded steel plates along the annular direction. After the prestressed steel bundle is tensioned and the steel bundle is anchored at the prestressed anchor support, the prestressed steel bundle is covered with steel pipes or closed angle steels, channel steels and / or split steel pipes are welded.

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