A steel tube bundle concrete structure and construction method for a circular silo bottom pressure relief cone

Abstract

The invention discloses a steel tube bundle concrete structure of a decompression cone at the bottom of a circular silo, belonging to the technical field of assembled decompression cones, comprising a conical steel tube bundle concrete body, wherein the steel tube bundle concrete body is split into a plurality of steel tube bundle concrete splits along its height direction, each of which comprises a steel tube bundle assembly and concrete poured into the steel tube bundle assembly, wherein the conical surface where the steel tube bundle assembly is located comprises a plurality of rectangular steel tubes distributed along the same circumferential direction, and two adjacent rectangular steel tubes are welded and connected by H-shaped steels; the rectangular steel tubes of the two adjacent steel tube bundle assemblies are matched with each other, and the corresponding two rectangular steel tubes are connected by a plurality of connecting steel bars, so as to solve the technical problems existing in the traditional reinforced concrete structure, realize the purpose of simple construction process, low equipment requirements, good structural integrity, airtightness and bearing capacity.

Description

Technical Field

[0001] The invention belongs to the technical field of assembled pressure reducing cones, and in particular relates to a steel tube bundle concrete structure of a pressure reducing cone at the bottom of a circular silo and a construction method. Background Art

[0002] The pressure relief cone is located at the bottom of the circular silo where the material is stored. After the powdered material is evenly stirred by gas in the silo, it needs to be decompressed by the pressure relief cone before it can be unloaded from the bottom of the pressure relief cone. It is widely used in power plants, cement, chemical and other industries. The pressure relief cone referred to here is supported on the top of the supporting cylinder wall of the circular silo. The outer diameter of the bottom is close to the inner diameter of the silo wall. According to the type of components that make up the pressure relief cone, the pressure relief cone can be divided into two parts: the cone shell and the cone bottom ring beam. Among them, the cone shell is located at the top of the pressure relief cone. It is an axisymmetric rotating cone thin shell structure. The angle between the generatrix and the horizontal plane is generally 60°. According to factors such as the silo diameter and material height, the thickness is generally 300-700mm.

[0003] The traditional structural form of the decompression cone adopts the reinforced concrete decompression cone shell structure, and the implementation path is on-site casting and prefabrication. Among them, the cast-in-place method has a cone shell shape, so the template size and steel bar length of the cone shell change along the height direction. During the construction process, the template engineering and steel bar engineering construction process are complex, difficult, labor-intensive and time-consuming.

[0004] The prefabricated assembly method reduces the on-site formwork and reinforcement work. The reinforced concrete structure is divided into blocks that can be hoisted. The blocks are prefabricated in the factory and assembled as is. The blocks are connected by secondary pouring or embedded parts. However, since the weight of the blocks is generally 15-25 tons, high requirements are placed on the capacity of the hoisting equipment during on-site assembly.

[0005] In summary, there are currently the following problems in the construction of pressure relief cones:

[0006] 1. The traditional reinforced concrete structure is used in combination with the cast-in-place method. Since the shape of the cone shell is a conical surface, the template size and the length of the steel bar of the cone shell change along the height direction. During the construction process, the template engineering and steel bar engineering construction processes are complex, difficult, labor-intensive and time-consuming;

[0007] 2. The traditional reinforced concrete structure is used in combination with prefabrication and assembly. Because each prefabricated component is heavy, the lifting capacity of the lifting equipment is very high, and the equipment usage cost is high;

[0008] 3. The traditional reinforced concrete structure is combined with prefabrication and assembly. When the prefabricated components are not subjected to secondary pouring, the integrity and airtightness of the structure are relatively poor. Summary of the invention

[0009] In view of this, in order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a steel tube bundle concrete structure and construction method of a circular silo bottom pressure relief cone so as to solve the technical problems existing in the traditional reinforced concrete structure, and realize the purpose of simple construction process, low equipment requirements, good structural integrity, airtightness and bearing capacity.

[0010] The technical solution adopted by the present invention is: a steel tube bundle concrete structure of a circular silo bottom pressure relief cone, comprising a conical steel tube bundle concrete body, the steel tube bundle concrete body is divided into multiple sections of steel tube bundle concrete splits along its height direction, each section of the steel tube bundle concrete split includes a steel tube bundle assembly and concrete poured into the steel tube bundle assembly, the conical surface where the steel tube bundle assembly is located includes a plurality of rectangular steel tubes distributed along the same circumferential direction, and two adjacent rectangular steel tubes are welded and connected by H-shaped steel; the rectangular steel tubes of the two adjacent steel tube bundle assemblies correspond to each other and the corresponding two rectangular steel tubes are connected by a plurality of connecting steel bars.

[0011] Furthermore, four connecting steel bars are provided and arranged at each corner of the rectangular steel pipe respectively, and the connecting steel bars are welded to the inner wall of the rectangular steel pipe on both sides by no less than 5d, where d is the diameter of the connecting steel bars, to ensure the connection strength between the connecting steel bars and the rectangular steel pipe.

[0012] Furthermore, the connecting steel bar is inserted into the upper rectangular steel tube for a length of not less than 40d and into the lower rectangular steel tube for a length of not less than 10d, where d is the diameter of the connecting steel bar, so as to ensure the firmness of the two corresponding rectangular steel tubes after being connected by the connecting steel bar.

[0013] Furthermore, one end of the connecting steel bar is configured to be in a hook shape or a straight hook shape, and the end is inserted into the rectangular steel pipe located above, so as to enhance the connection firmness of the connecting steel bar to the rectangular steel pipe located above.

[0014] Furthermore, it also includes a cone shell that matches the steel tube bundle concrete body, concrete is poured in the cone shell, and a plurality of annular tie steel bars are arranged in the cone shell, and the overall strength of the top small cone is improved by each annular tie steel bar.

[0015] Furthermore, the cross-sectional thickness of the rectangular steel tube and the H-shaped steel is set to 4-6 mm to ensure the overall structural strength.

[0016] Furthermore, the H-shaped steel includes a flat steel plate web and U-shaped plate flanges welded to both sides of the flat steel plate web; the two sides of the U-shaped plate flanges are respectively welded to the corners of the two adjacent rectangular steel pipes to connect and fix each rectangular steel pipe through the H-shaped steel.

[0017] Furthermore, the spacing between the flat steel plate web of the H-shaped steel and the side plate of the rectangular steel tube is not greater than 450 mm to ensure the structural strength of the entire pressure reducing cone.

[0018] The present invention also discloses a construction method of a steel tube bundle concrete structure of a circular silo bottom pressure relief cone, the construction method comprising the following steps:

[0019] (1) Production of each section of steel tube bundle assembly:

[0020] A fixing bracket is arranged according to the inner surface of the conical surface where the steel pipe bundle assembly is located;

[0021] Make H-shaped steel and complete the blanking of rectangular steel pipes;

[0022] Fix each rectangular steel pipe on the fixed bracket along the generatrix direction of the conical surface;

[0023] Insert an H-shaped steel between two adjacent rectangular steel pipes, and complete the welding connection between the H-shaped steel and the rectangular steel pipe;

[0024] Production of top small cone: Complete the production of the top cone shell according to the design drawings;

[0025] (2) Transportation of steel tube bundle assemblies: transport the assembled sections of steel tube bundle assemblies to the site. During transportation and stacking, deformation and damage of individual steel tube bundle assemblies should be prevented;

[0026] (3) Preparation: Level and clean the surface of each section of the steel pipe bundle assembly, and mark the installation position of each section of the steel pipe bundle assembly;

[0027] (4) Fabrication of steel tube bundle concrete body:

[0028] Pour concrete into the first section of the steel tube bundle assembly to complete the construction of the first section of the steel tube bundle concrete split;

[0029] After the strength of the first section of the steel tube bundle concrete split reaches 60%-80%, the second section of the steel tube bundle assembly is hoisted and temporarily supported;

[0030] Connecting the first section of the steel tube bundle assembly to the second section of the steel tube bundle assembly by connecting steel bars;

[0031] Pour concrete into the second section of the steel tube bundle assembly to complete the construction of the second section of the steel tube bundle concrete split;

[0032] Repeat this process until the concrete construction of each section of steel tube bundle is completed;

[0033] The top cone shell is hoisted and connected to the top steel pipe bundle assembly, and concrete is poured into the top cone shell.

[0034] Furthermore, in step (4), it also includes splitting each section of the steel tube bundle assembly into multiple single cone shell lifting units along the circumferential direction, and each single cone shell lifting unit is welded and connected along the generatrix direction of the conical surface where the steel tube bundle assembly is located.

[0035] The beneficial effects of the present invention are:

[0036] 1. The steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention utilizes the good mechanical properties of the steel tube bundle concrete to improve the bearing capacity of the structure, the integrity of the structure and the airtightness of the cone shell; the good mechanical properties of the steel tube bundle assembly structure are utilized to replace the concrete formwork, which is easy to operate during the implementation stage and has low requirements for construction equipment; at the same time, the use of this technical solution reduces the amount of concrete used in the structure by 20%.

[0037] 2. The construction method of the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention is adopted. After splitting, the construction is carried out in sections, which makes the construction process smoother and reduces the construction period of the silo by 1 month. The construction method complies with the national industrial policy, can realize the industrialization and standardization of construction, and reduce resource waste. It has the advantages of being green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structure of the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention, which is cast on site;

[0039] Figure 2 It is a schematic diagram of the overall structure of the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention;

[0040] Figure 3 It is a schematic diagram of the local structure of the rectangular steel pipe and H-shaped steel assembly in the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention;

[0041] Figure 4 yes Figure 3 A partial enlarged schematic diagram of

[0042] Figure 5 It is a schematic cross-sectional view of the H-shaped steel in the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention;

[0043] Figure 6 It is a cross-sectional schematic diagram of a steel tube bundle assembly in a steel tube bundle concrete structure of a circular silo bottom pressure reducing cone provided by the present invention;

[0044] Figure 7 It is a schematic diagram of the connection and assembly of two rectangular steel pipes in the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention;

[0045] Figure 8This is a schematic diagram of the structure of the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention after vertical splitting, with the middle section of the steel tube bundle concrete split

[0046] Fig. 9 It is a structural schematic diagram of the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention after vertical splitting, and the lower section of the steel tube bundle concrete split body;

[0047] Fig.10 It is a schematic diagram of the assembly structure of the top cone shell in the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention;

[0048] Fig.11 It is a schematic diagram of the radial split structure of the steel tube bundle assembly in the steel tube bundle concrete structure of the circular silo bottom pressure relief cone provided by the present invention;

[0049] The following are marked in the attached figure:

[0050] 1-steel tube bundle concrete body, 2-lower section steel tube bundle concrete split, 3-middle section steel tube bundle concrete split, 4-upper section steel tube bundle concrete split, 5-conical shell, 6-rectangular steel tube, 7-H-shaped steel, 8-flat steel plate web, 9-U-shaped plate flange, 10-connecting steel bars, 11-annular tie steel bars, 12-single cone shell lifting unit. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0056] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0057] Example 1

[0058] like Figure 1 As shown, in this embodiment, a steel tube bundle concrete structure of a circular silo bottom pressure relief cone is specifically provided, which includes a conical steel tube bundle concrete body 1 to form a conical curved surface structure capable of bearing the storage load, and the storage load is the self-weight of the cone and other loads on the cone.

[0059] like Figure 2 As shown, the steel tube bundle concrete body 1 is split into multiple sections of steel tube bundle concrete splits along its axial direction. In this embodiment, the steel tube bundle concrete body 1 is split into three sections: an upper section steel tube bundle concrete split 4, a middle section steel tube bundle concrete split 3, and a lower section steel tube bundle concrete split 2. Each section of the steel tube bundle concrete split includes a steel tube bundle component and concrete poured into the steel tube bundle component. The conical surface where the steel tube bundle component is located includes a plurality of rectangular steel pipes 6 distributed along the same circumferential direction. Each rectangular steel pipe 6 is evenly distributed and is hollow inside the rectangular steel pipe 6. Concrete is poured into the internal cavity. In this embodiment, the width of the rectangular steel pipe 6 is recommended to be 200 mm to 300 mm. A rolled steel pipe or a cold-bent high-frequency welded steel pipe can be used.

[0060] like Figure 3 , Figure 4As shown, two adjacent rectangular steel tubes 6 are connected by welding through H-shaped steel 7; Figure 5 As shown, the H-shaped steel 7 includes a flat steel plate web 8 and U-shaped plate flanges 9 welded to both sides of the flat steel plate web 8; the two sides of the U-shaped plate flanges 9 are respectively welded to the corners of the two adjacent rectangular steel tubes 6, that is, the welds are arranged along the length direction of the corners of the rectangular steel tube 6 and the length direction of the U-shaped plate flanges 9 of the H-shaped steel 7 on both sides, and the welding height of the weld is the thickness of the minimum plate. The connecting weld between the flat steel plate web 8 and the U-shaped plate flanges 9 is a single-sided or double-sided fillet weld and the weld height is the thickness of the flat steel plate web 8; wherein the U-shaped plate flanges 9 are formed by cold bending, and in order to match the steel tube bundle assembly formed by the H-shaped steel 7 and the rectangular steel tube 6 in a conical shape, the U-shaped plate flanges 9 on both sides of the flat steel plate web 8 are provided with inconsistent widths. In this embodiment, preferably, the cross-sectional thickness of the rectangular steel tube 6 and the H-shaped steel 7 is set to 4 to 6 mm, such as Figure 5 The thickness t and Figure 6 The thickness h in the specific application process is determined by the diameter of the bottom of the decompression cone and the thickness of the calculated cone shell 5. When the thickness of the decompression cone is large, a larger component thickness is selected.

[0061] like Figure 7 As shown, the rectangular steel tubes 6 of the two adjacent steel tube bundle assemblies correspond to each other (due to the different sizes of the conical surfaces of the upper, middle and lower sections, the rectangular steel tubes 6 located at the upper part of the two steel tube bundle assemblies can correspond to the rectangular steel tubes 6 located at the lower part), and the corresponding two rectangular steel tubes 6 are connected by a plurality of connecting steel bars 10, that is, each connecting steel bar 10 is arranged at the connection between the upper section and the middle section, and the middle section and the lower section, and is continuously arranged in each rectangular steel tube 6, and the two ends of each connecting steel bar 10 are respectively extended into the rectangular steel tubes 6 of different sections of the steel tube bundle assembly. In this embodiment, in order to ensure the connection firmness between the two rectangular steel tubes 6, four connecting steel bars 10 are provided and arranged at the respective corners of the two corresponding rectangular steel tubes 6, and the connecting steel bars 10 are welded to the inner wall of the rectangular steel tube 6 on both sides for not less than 5d, where d is the diameter of the connecting steel bars 10; at the same time, in order to ensure that the connecting steel bars 10 can provide sufficient connection force, the connecting steel bars 10 are inserted into the upper rectangular steel tube 6 for a length of not less than 40d and into the lower rectangular steel tube 6 for a length of not less than 10d, where d is the diameter of the connecting steel bars 10. Preferably, the diameter of the connecting steel bars 10 is 16mm to 20mm. In practice, when the bottom diameter of the decompression cone is large, a connecting steel bar 10 with a large diameter is preferred.

[0062] In the above, the material of the steel is Q235B, the welding rod is E43 series, the steel bar is HPB300 or HRB400, and the concrete is C40.

[0063] On the basis of the above, in order to further improve the connection strength and performance of the connecting steel bar 10, one end of the connecting steel bar 10 is set to be a hook shape (steel HPB300) or a straight hook shape (steel HRB400), and the end is inserted into the rectangular steel pipe 6 located above, that is, in the two adjacent steel pipe bundle assemblies, the connecting steel bar 10 inserted in the rectangular steel pipe 6 located in the upper steel pipe bundle assembly is in a hook shape (steel HPB300) or a straight hook shape (steel HRB400), and the connecting steel bar 10 inserted in the rectangular steel pipe 6 located in the lower steel pipe bundle assembly is in a straight line, so that when concrete is injected into the rectangular steel pipe 6, the connecting steel bar 10 can provide sufficient tensile strength under the action of concrete solidification to prevent loosening or falling off between the steel pipe bundle assemblies.

[0064] To realize the whole steel tube bundle concrete structure, such as Fig.10 As shown, the steel tube bundle concrete structure should also include a cone shell 5 that matches the steel tube bundle concrete body 1, concrete is poured in the cone shell 5, and a plurality of annular tie steel bars 11 are arranged in the cone shell 5, the same end of each annular tie steel bar 11 is located at the bottom center of the cone shell 5, and the other end is respectively dispersed on the conical surface of the cone shell 5. After the cone shell 5 is filled with concrete, the strength of the entire concrete is effectively improved through each annular tie steel bar 11.

[0065] The arrangement requirements of the above-mentioned steel tube bundle assembly are as follows: the axial direction of each rectangular steel tube 6 in the steel tube bundle assembly is arranged parallel to the generatrix direction of the conical surface where the steel tube bundle assembly is located, and the arrangement quantity of the rectangular steel tube 6 and H-shaped steel 7 in the steel tube bundle assembly is determined according to the outer diameter of the bottom of the cone shell 5 and the size of the concrete side pressure during construction. In actual application, it is recommended that the spacing of the plates parallel to the diameter direction in the circumferential direction is not greater than 450mm, that is, the spacing between the flat steel plate web 8 of the H-shaped steel 7 and the side plate of the rectangular steel tube 6 is not greater than 450mm.

[0066] In this embodiment, if Figure 8 , Fig. 9 As shown, the steel tube bundle concrete body 1 is split into three sections, upper, middle and lower, along its axial direction, i.e., vertical splitting, and the splitting position is in the horizontal direction. When the vertical splitting is performed, one end of each connecting steel bar 10 is inserted into the steel tube bundle assembly located below and welded in advance during installation. When the steel tube bundle assembly located above needs to be installed, the connecting steel bar 10 reserved in the rectangular steel pipe 6 located below is inserted into the rectangular steel pipe 6 corresponding to the steel tube bundle assembly, and then the subsequent pouring construction is performed;

[0067] In actual application, in order to meet the lifting load requirements of the lifting equipment, such as Fig.11As shown, each section of the steel tube bundle concrete split can also be radially split, and the splitting position is along the generatrix direction of the cone surface. After splitting, the weight of each piece is within the lifting capacity of the tower crane. After radial splitting, after on-site lifting is completed, welding is completed according to the connection requirements of each split unit to form an integral steel tube bundle assembly.

[0068] Example 2

[0069] On the basis of Example 1, this embodiment further discloses a construction method of a steel tube bundle concrete structure of a circular silo bottom pressure relief cone, so as to achieve a smoother construction process through the construction method. In the construction method, the steel tube bundle concrete body 1 is vertically split and radially split, and the construction method includes the following steps:

[0070] (1) Production of each section of steel tube bundle assembly:

[0071] A. Since each section of the steel tube bundle assembly is radially split, such as Fig.11 As shown, each section of the steel pipe bundle assembly is split into a plurality of single cone shell hoisting units 12 along the circumferential direction. Considering that the surface of each single cone shell hoisting unit 12 is a curved surface after being manufactured, a fixing bracket is arranged according to the inner surface of the conical surface where the steel pipe bundle assembly (or each single cone shell hoisting unit 12) is located. The fixing bracket is used to temporarily fix each rectangular steel pipe 6 distributed along the generatrix of the conical surface;

[0072] B. According to the pre-designed cross-sectional dimensions of the H-shaped steel 7, the H-shaped steel 7 is manufactured, and the rectangular steel tube 6 is cut;

[0073] C. Fix each rectangular steel tube 6 on the fixing bracket along the generatrix direction of the conical surface, and adjust the positioning of each rectangular steel tube 6;

[0074] D. Insert the H-shaped steel 7 between two adjacent rectangular steel tubes 6, and complete the welding connection between the H-shaped steel 7 and the rectangular steel tube 6. During the welding process, the outer side of the U-shaped plate flange 9 of the H-shaped steel 7 can be welded first, and then the inner side of the U-shaped plate flange 9 of the H-shaped steel 7 can be welded;

[0075] E. According to the hook position determined by the calculation in the construction stage, the hook is welded to the corresponding position of the single cone shell lifting unit 12. The hook position should be set between the side of the rectangular steel pipe 6 and the flat steel plate web 8 of the H-shaped steel 7;

[0076] F. Check, correct and adjust the single cone shell hoisting unit 12;

[0077] G. Make bolt holes, embedded parts and cutting holes according to the design drawings;

[0078] H. Complete the production of each single cone shell lifting unit 12.

[0079] This step also includes the production of the top cone:

[0080] a. By means of a single cone shell hoisting unit 12, the production of the top small cone shell 5 is completed;

[0081] b. Cutting of steel plates;

[0082] c. Group according to the shape of the design drawing;

[0083] d. Complete welding of steel plate joints;

[0084] e. Check, correct and adjust;

[0085] f. Make bolt holes, embedded parts, etc. according to the design drawings.

[0086] (2) Transportation of steel tube bundle assemblies: The assembled sections of steel tube bundle assemblies shall be transported to the site. During transportation and stacking, appropriate measures shall be taken to prevent deformation and damage of individual steel tube bundle assemblies.

[0087] (3) Preparation:

[0088] (a) Prepare the tools and equipment required during the assembly process, including temporary supports and tools, and storage space;

[0089] (b) Level and clean the surface of each section of steel pipe bundle assembly according to the design drawings;

[0090] (c) Lay out and mark the installation positions of each section of steel pipe bundle assembly.

[0091] (4) Fabrication of steel tube bundle concrete body 1:

[0092] 1) According to the construction plan, hoist the individual cone shell hoisting units 12 of the first section of the steel pipe bundle assembly respectively. During the hoisting, symmetric hoisting should be adopted and temporary support brackets should be made;

[0093] 2) Position inspection and intermediate acceptance;

[0094] 3) welding and connecting the individual cone shell hoisting units 12 along the busbar direction of the split unit;

[0095] 4) Complete the assembly and connection of the first section of the steel tube bundle assembly, and inspect and adjust the steel tube bundle assembly to meet the requirements of the design and construction specifications;

[0096] 5) Pour concrete into the first section of the steel tube bundle assembly to complete the construction of the first section of the steel tube bundle concrete split;

[0097] 6) After the strength of the first section of the steel tube bundle concrete split reaches 70%, each single cone shell hoisting unit 12 in the next section of the steel tube bundle assembly is hoisted and temporarily supported;

[0098] 7) Position inspection and intermediate acceptance;

[0099] 8) Connect each single cone shell hoisting unit 12 in the next section of the steel pipe bundle assembly to the first section of the steel pipe bundle assembly;

[0100] 9) Weld and connect the individual lifting units in the next section of the steel tube bundle assembly along the busbar direction of the split unit in the next section to form the next section of the steel tube bundle assembly;

[0101] 10) Check and adjust the next section of steel pipe bundle components to meet the requirements of design and construction specifications;

[0102] 11) Pour concrete into the next section of the steel tube bundle assembly to complete the construction of the next section of the steel tube bundle concrete split;

[0103] 12) Repeat this process until the concrete construction of each section of the steel tube bundle is completed;

[0104] 13) Hoist the top cone shell 5, and after inspection, connect the top cone shell 5 with the top steel pipe bundle assembly;

[0105] 14) Pour concrete into the top cone shell 5.

[0106] In the construction method disclosed above, in addition to splitting the steel tube bundle concrete body 1 into multiple sections along its axial direction, each section of the steel tube bundle assembly is also split into multiple single cone shell lifting units 12 along the circumferential direction. This method is mainly used to ensure that the weight of each single cone shell lifting unit 12 can meet the load weight of the lifting equipment. Of course, in actual application, the steel tube bundle assembly sections may not be radially split.

[0107] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A steel tube bundle concrete structure with a decompression cone at the bottom of a circular silo, comprising a conical steel tube bundle concrete body, characterized in that: The steel tube bundle concrete body is split into multiple sections of steel tube bundle concrete split bodies along its height direction, each section of the steel tube bundle concrete split body includes a steel tube bundle assembly and concrete poured into the steel tube bundle assembly, the conical surface where the steel tube bundle assembly is located includes a plurality of rectangular steel tubes distributed along the same circumferential direction, and two adjacent rectangular steel tubes are welded and connected by H-shaped steel; the rectangular steel tubes of two adjacent steel tube bundle assemblies are matched with each other, and the corresponding two rectangular steel tubes are connected by a plurality of connecting steel bars; One end of the connecting steel bar is configured as a hook or a straight hook, and the end is inserted into the rectangular steel pipe located above; It also includes a cone shell matched with the steel tube bundle concrete body, concrete is poured in the cone shell, and a plurality of annular tie steel bars are arranged in the cone shell.

2. The steel tube bundle concrete structure of the circular silo bottom pressure relief cone according to claim 1 is characterized in that: There are four connecting steel bars and they are arranged at each corner of the rectangular steel pipe respectively, and the connecting steel bars are welded to the inner wall of the rectangular steel pipe on both sides by no less than 5d, where d is the diameter of the connecting steel bars.

3. The steel tube bundle concrete structure of the circular silo bottom pressure relief cone according to claim 1 is characterized in that: The connecting steel bar is inserted into the upper rectangular steel pipe for a length of not less than 40d and into the lower rectangular steel pipe for a length of not less than 10d, where d is the diameter of the connecting steel bar.

4. The steel tube bundle concrete structure of the circular silo bottom pressure relief cone according to claim 1 is characterized in that: The cross-sectional thickness of the rectangular steel tube and the H-shaped steel is set to 4-6 mm.

5. The steel tube bundle concrete structure of the circular silo bottom pressure relief cone according to claim 1 is characterized in that: The H-shaped steel comprises a flat steel plate web and U-shaped plate flanges welded to both sides of the flat steel plate web; both sides of the U-shaped plate flanges are respectively welded and connected to the corners of two adjacent rectangular steel pipes.

6. The steel tube bundle concrete structure of the circular silo bottom pressure relief cone according to claim 5 is characterized in that: The distance between the flat steel plate web of the H-shaped steel and the side plate of the rectangular steel tube is not greater than 450 mm.

7. A construction method for a steel tube bundle concrete structure of a circular silo bottom pressure relief cone, characterized in that: The construction method is applied to the steel tube bundle concrete structure of the circular silo bottom pressure relief cone as described in any one of claims 1 to 6. The following steps are involved: (1) Production of each section of steel tube bundle assembly: A fixing bracket is arranged according to the inner surface of the conical surface where the steel pipe bundle assembly is located; Make H-shaped steel and complete the blanking of rectangular steel pipes; Fix each rectangular steel pipe on the fixed bracket along the generatrix direction of the conical surface; Insert an H-shaped steel between two adjacent rectangular steel pipes, and complete the welding connection between the H-shaped steel and the rectangular steel pipe; Production of top small cone: Complete the production of the top cone shell according to the design drawings; (2) Transportation of steel tube bundle assemblies: transport the assembled sections of steel tube bundle assemblies to the site. During transportation and stacking, deformation and damage of individual steel tube bundle assemblies should be prevented; (3) Preparation: Level and clean the surface of each section of the steel tube bundle assembly, and mark it according to the installation position of each section of the steel tube bundle assembly; (4) Fabrication of the steel tube bundle concrete body: Pour concrete into the first section of the steel tube bundle assembly to complete the construction of the first section of the steel tube bundle concrete split; After the strength of the first section of the steel tube bundle concrete split reaches 60%-80%, the second section of the steel tube bundle assembly is hoisted and temporarily supported; Connecting the first section of the steel tube bundle assembly to the second section of the steel tube bundle assembly by connecting steel bars; Pour concrete into the second section of the steel tube bundle assembly to complete the construction of the second section of the steel tube bundle concrete split; Repeat this process until the concrete construction of each section of steel tube bundle is completed; The top cone shell is hoisted and connected to the top steel pipe bundle assembly, and concrete is poured into the top cone shell.

8. The construction method of the steel tube bundle concrete structure of the circular silo bottom pressure relief cone according to claim 7 is characterized in that: In step (4), the method further includes splitting each section of the steel tube bundle assembly into a plurality of single cone shell hoisting units along the circumferential direction, and welding each single cone shell hoisting unit along the generatrix direction of the conical surface where the steel tube bundle assembly is located.

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