Method for installing a large rectangular steel structure connected to a concrete pipe

Abstract

The application provides a large rectangular steel structure installation method connected with a concrete pipeline, and belongs to the technical field of steel structure installation, and comprises the following steps: dividing a large rectangular steel structure into an upper right-angle structure, left and right structures, a lower right-angle structure, an upper structure and a lower structure for segmented production; processing and forming a rectangular flange; installing to form a large rectangular steel structure; ensuring that the end surface of the rectangular flange is perpendicular to and coplanar with the ground, and completing welding; making the end surface of the rectangular flange meet design requirements; and performing secondary grouting on the inner wall surface of the concrete pipeline. The rectangular flange is segmented and produced, segmented and installed after processing, and welded into a whole, so that on-site processing after overall production is avoided, and processing cost is reduced. During installation, the end surface of the rectangular flange is used as a reference, and the position precision of the end surface of the rectangular flange is adjusted by adopting a series of measures after segmented welding of the steel structure, so that the installation precision of the rectangular flange is ensured, and the measure cost is reduced to the maximum extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure installation, and particularly relates to a large rectangular steel structure installation method connected with a concrete pipeline. BACKGROUND

[0002] Some pipeline equipment with low air flow velocity is made of concrete structure to reduce construction cost due to low impact load, but the core part for air blowing test still needs to be made of steel structure due to high precision requirement. The connection quality between the steel structure part and the concrete pipeline is uncontrollable, especially the interface quality between the inner wall surface of the steel structure part and the inner wall surface of the concrete pipeline, so the construction of the steel structure part connected with the concrete pipeline is the key and difficulty of the pipeline equipment construction.

[0003] The large non-standard steel structure part connected with the concrete pipeline has an outer size (width and height) of more than 30*50m, and the structure is a hollow rectangular body. Figure 1 As shown in the figure: the large rectangular steel structure is composed of a truss assembly, a rectangular flange, a shell and a bolt assembly; the inner wall surface of the large rectangular steel structure and the inner wall surface of the concrete pipeline jointly form an air flow profile.

[0004] Due to the large size of the steel structure part, the manufacturing and installation need to be completed on the construction site, and the construction is difficult, and there are the following technical problems: first, the size of the rectangular flange is large, and it is difficult and costly to process on site after the whole manufacturing, and the processing equipment is required to be high; second, the precision of the concrete pipeline is low, and the connection quality between the steel structure part and the concrete pipeline cannot be guaranteed; third, the bending resistance of the steel structure part is poor, and a reasonable segmented manufacturing and installation process needs to be adopted to ensure the construction precision of the steel structure part, especially when working in a limited space on site, which further increases the difficulty of on-site construction. SUMMARY

[0005] The present application provides a large rectangular steel structure connected with a concrete pipeline and an installation method, to solve the defects of the steel structure installation in the prior art and achieve the purpose of reducing the construction difficulty.

[0006] The application provides a large rectangular steel structure installation method connected with a concrete pipeline, which is used for installing the large rectangular steel structure connected with the concrete pipeline, and comprises the following steps: according to design drawings, the large rectangular steel structure is divided into an upper right-angle structure, left-right structures, a lower right-angle structure, an upper structure and a lower structure for segmented production; rectangular flanges of the upper right-angle structure, the left-right structures, the lower right-angle structure, the upper structure and the lower structure are processed and formed; the lower right-angle structure is installed and fixed, several segments of the left-right structures are installed and fixed in sequence from bottom to top, the upper right-angle structure is installed and fixed, several segments of the upper structure are assembled and welded on the projection ground surface of the upper structure installation position, the welded upper structure is integrally lifted to the upper installation and fixation, a truss assembly of the lower structure is installed and fixed, and then a shell of the lower structure is installed on the truss assembly to form the large rectangular steel structure; the position precision of the rectangular flange is adjusted to ensure that end surfaces of the rectangular flanges of the upper right-angle structure, the left-right structures, the lower right-angle structure, the upper structure and the lower structure are perpendicular to and coplanar with the ground, and welding of the upper right-angle structure, the left-right structures, the lower right-angle structure, the upper structure and the lower structure is completed; the spatial position of the end surface of the rectangular flange is measured, the position precision of the large rectangular steel structure is locally adjusted, the elevation, coaxiality and plane position of the end surface of the rectangular flange meet the design requirements, and welding of the end surface of the shell inlet and the embedded steel plate is completed; and the inner wall surface of the concrete pipeline in the interface range between the concrete pipeline and the large rectangular steel structure is subjected to secondary grouting.

[0007] According to the large rectangular steel structure installation method connected with the concrete pipeline, the upper right-angle structure is located at the corner end position of the upper part of the large rectangular steel structure and is L-shaped, the upper right-angle structure is symmetrical about the axis of the large rectangular steel structure; the lower right-angle structure is located at the corner end position of the lower part of the large rectangular steel structure and is L-shaped, the lower right-angle structure is symmetrical about the axis of the large rectangular steel structure; the left-right structures are located at the left and right sides of the large rectangular steel structure, and the left-right structures are symmetrical about the axis of the large rectangular steel structure; the upper structure is located at the upper part of the large rectangular steel structure, and the lower structure is located at the lower part of the large rectangular steel structure.

[0008] According to the large rectangular steel structure installation method connected with the concrete pipeline provided by the application, the truss assembly and the shell of the upper right-angle structure are respectively manufactured in a vertical state, and then the truss assembly and the shell of the upper right-angle structure are assembled and welded in the vertical state; the left and right structures are divided into several segments, and the truss assembly and the shell of the left and right structures are respectively assembled in a horizontal state, and then the truss assembly and the shell of the left and right structures are assembled and welded in the horizontal state; when the left and right structures are welded, the welds between the several segments of the left and right structures are only spot-welded, and after the welding of the left and right structures is completed, the several segments of the left and right structures are separated; the truss assembly and the shell of the lower right-angle structure are respectively manufactured in a vertical state, and then the truss assembly and the shell of the lower right-angle structure are assembled and welded in the vertical state; the upper structure is divided into several segments, and each segment of the upper structure is manufactured in a horizontal state, and then the truss assembly and the shell of each segment of the upper structure are assembled and welded in the horizontal state; the truss assembly of the lower structure is divided into several segments, and the shell of the lower structure is divided into several segments, and the truss assembly and the shell of the lower structure are respectively manufactured in a horizontal state.

[0009] According to the large rectangular steel structure installation method connected with the concrete pipeline provided by the application, after the upper right-angle structure, the left and right structures, the lower right-angle structure, the upper structure and the lower structure are installed in place, the upper right-angle structure, the left and right structures, the lower right-angle structure, the upper structure and the lower structure are temporarily connected and fixed with the embedded steel plate by using a bolt assembly.

[0010] According to the large rectangular steel structure installation method connected with the concrete pipeline provided by the application, after the upper right-angle structure, the left and right structures, the lower right-angle structure, the upper structure and the lower structure are welded, the weld excess height of the rectangular flange is polished and removed.

[0011] According to the large rectangular steel structure installation method connected with the concrete pipeline provided by the application, the elevation, coaxiality and plane position of the end face of the rectangular flange meet the design requirements, which comprises the following steps: inserting gaskets with different thicknesses into the embedded steel plate and the shell inlet end face to adjust the perpendicularity and plane position of the end face of the rectangular flange; arranging a jack at the bottom of the truss assembly to adjust the elevation of the rectangular flange; and inserting gaskets with different thicknesses into the connection between the truss assembly and the shell to adjust the coaxiality of the rectangular flange and the concrete pipeline.

[0012] According to the large rectangular steel structure installation method connected with the concrete pipeline provided by the application, the interface between the large rectangular steel structure and the concrete pipeline is subjected to pressure grouting repair at the gap position.

[0013] According to a method for installing a large rectangular steel structure connected to a concrete pipe provided by the present invention, a template is used to measure the accuracy of the airflow profile formed by the inner wall surface of the large rectangular steel structure and the inner wall surface of the concrete pipe, unqualified areas are marked, and the secondary grouting layer and pressure grouting layer are repaired.

[0014] The present invention also provides a large rectangular steel structure connected to a concrete pipe, comprising: a truss assembly, a rectangular flange, a shell and a bolt assembly; the truss assembly is arranged around the outer contour of the shell to increase the overall stiffness of the steel structure component; the shell is a hollow rectangular structure, the inlet end of the shell is connected to the outlet end of the concrete pipe through the bolt assembly, and the outlet end of the shell is connected to other steel structure components of the pipeline equipment through the rectangular flange.

[0015] The present invention provides a method for installing a large rectangular steel structure connected to a concrete pipe. By manufacturing and processing the rectangular flange in sections, then installing and welding the sections together, the method avoids on-site processing after the overall fabrication is complete, reducing construction difficulty, resource requirements, and processing costs. Furthermore, the rectangular flange end faces serve as a reference for installation of the various sections of the large rectangular steel structure. After welding, a series of measures are employed to adjust the positional accuracy of the rectangular flange end faces, ensuring installation accuracy while minimizing the cost of these measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is one of the structural schematic diagrams of a large rectangular steel structure connected to a concrete pipe provided by the present invention;

[0018] Figure 2 This is the second structural diagram of a large rectangular steel structure connected to a concrete pipe provided by the present invention;

[0019] Figure 3 This is a flow chart of a method for installing a large rectangular steel structure connected to a concrete pipe provided by the present invention;

[0020] Figure 4 It is a schematic diagram of a section of a large rectangular steel structure connected to a concrete pipe provided by the present invention;

[0021] Figure 5is one of large rectangular steel structure sectional installation schematic diagram provided by the present application which is connected with concrete pipeline;

[0022] Figure 6 is one of large rectangular steel structure sectional installation schematic diagram provided by the present application which is connected with concrete pipeline;

[0023] Figure 7 is one of large rectangular steel structure sectional installation schematic diagram provided by the present application which is connected with concrete pipeline;

[0024] Figure 8 is one of large rectangular steel structure sectional installation schematic diagram provided by the present application which is connected with concrete pipeline;

[0025] Figure 9 is one of large rectangular steel structure sectional installation schematic diagram provided by the present application which is connected with concrete pipeline;

[0026] Figure 10 is one of large rectangular steel structure sectional installation schematic diagram provided by the present application which is connected with concrete pipeline;

[0027] Figure 11 is one of large rectangular steel structure sectional installation schematic diagram provided by the present application which is connected with concrete pipeline;

[0028] Figure 12 is Figure 11 enlarged view of part A in figure 1.

[0029] Reference signs:

[0030] 100, truss assembly;

[0031] 200, rectangular flange;

[0032] 300, shell;

[0033] 400, bolt assembly;

[0034] 10, upper right-angle structure;

[0035] 20, left-right structure;

[0036] 30, lower right-angle structure;

[0037] 40, upper structure;

[0038] 50, lower structure;

[0039] 60, embedded steel plate;

[0040] 1, large rectangular steel structure;

[0041] 2, concrete pipeline. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall into the protection scope of the present application.

[0043] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0044] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on Figure 1 The orientation and position of the large rectangular steel structure connected with the concrete pipeline shown are only for the convenience of describing the present application and simplifying the description, and these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, unless otherwise stated, and therefore cannot be understood as a limitation on the protection scope of the present application. The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0045] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0046] The present application provides a large rectangular steel structure installation method connected with a concrete pipeline, referring to Figure 3 for installing a large rectangular steel structure 1 connected with a concrete pipeline 2 as described above, comprising the following steps:

[0047] Step 1: According to the design drawing, referring to Figure 4 , the large rectangular steel structure is divided into upper right-angle structure 10, left and right structure 20, lower right-angle structure 30, upper structure 40 and lower structure 50 for segmented production respectively.

[0048] The upper right-angle structure 10 is located at the corner end of the upper part of the large rectangular steel structure, is L-shaped, and is symmetrical about the axis of the large rectangular steel structure; the lower right-angle structure 30 is located at the corner end of the lower part of the large rectangular steel structure, is L-shaped, and is symmetrical about the axis of the large rectangular steel structure; the left-right structure 20 is located at the left and right sides of the large rectangular steel structure, is symmetrical about the axis of the large rectangular steel structure; the upper structure 40 is located at the upper part of the large rectangular steel structure; and the lower structure 50 is located at the lower part of the large rectangular steel structure.

[0049] In an embodiment, the truss assembly and the shell of the upper right-angle structure 10 are respectively manufactured in an upright state, and then the truss assembly and the shell of the upper right-angle structure 10 are assembled and welded in the upright state; the left-right structure 20 is divided into several segments, the truss assembly and the shell of the left-right structure 20 are respectively assembled in a horizontal state, and then the truss assembly and the shell of the left-right structure 20 are assembled and welded in the horizontal state, the welds between the several segments of the left-right structure 20 are only spot-welded, and the several segments of the left-right structure 20 are separated after the left-right structure 20 is welded; the truss assembly and the shell of the lower right-angle structure 30 are respectively manufactured in an upright state, and then the truss assembly and the shell of the lower right-angle structure 30 are assembled and welded in the upright state; the upper structure 40 is divided into several segments, and each segment of the upper structure 40 is manufactured in a horizontal state, the truss assembly and the shell of each segment of the upper structure 40 are respectively manufactured in the horizontal state, and then the truss assembly and the shell of each segment of the upper structure 40 are assembled and welded in the horizontal state; the truss assembly of the lower structure 50 is divided into several segments, and the shell of the lower structure 50 is divided into several segments, and each segment of the truss assembly and the shell of the lower structure 50 is manufactured in a horizontal state.

[0050] Step 2: The rectangular flanges of the upper right-angle structure, the left-right structure, the lower right-angle structure, the upper structure, and the lower structure manufactured are processed and formed.

[0051] Step 3: The lower right-angle structure 30 is first installed and fixed, the several segments of the left-right structure 20 are installed and fixed in the order from bottom to top, then the upper right-angle structure 10 is installed and fixed, the several segments of the upper structure 40 are assembled and welded on the projection ground surface at the installation position of the upper structure 40, the entire upper structure 40 after welding is lifted to the upper installation position, and finally the truss assembly of the lower structure 50 is installed and fixed, and then the shell of the lower structure 50 is installed on the truss assembly, to form the large rectangular steel structure 1.

[0052] In an embodiment, after several segments of the upper structure 40 are assembled and welded into a whole, the weight is large and the span is large, and large hoisting equipment is needed to realize hoisting installation, and it is difficult to install in a limited space. The lifting device is arranged on the upper right-angle structure 10, and the upper structure 40 is integrally lifted and installed, which can solve the problem of installation in a limited space.

[0053] In an embodiment, after the upper right-angle structure 10, the left-right structure 20, the lower right-angle structure 30, the upper structure 40, and the lower structure 50 are installed in place, the upper right-angle structure 10, the left-right structure 20, the lower right-angle structure 30, the upper structure 40, and the lower structure 50 are temporarily connected and fixed with the embedded steel plate 60 by using installation bolts. In this way, the structural stability can be increased to ensure construction safety, and the structure can be fixed with the embedded steel plate 60 to reduce subsequent welding deformation.

[0054] For example, the truss assembly and the shell of the upper right-angle structure 10 are respectively manufactured in an upright state, and then the truss assembly of the upper right-angle structure 10 and the shell of the upper right-angle structure 10 are assembled and welded in the upright state, and the shell is located below the truss assembly during assembly. The manufactured upper right-angle structure 10 can be hoisted, transported, and installed in an upright state, and does not need to be turned over during installation.

[0055] For example, since the left-right structure 20 has a large span, the left-right structure 20 is divided into several segments for manufacturing to avoid deformation during hoisting. During manufacturing, the truss assembly and the shell of the left-right structure 20 are respectively assembled in a horizontal state, and then the truss assembly of the left-right structure 20 and the shell of the left-right structure 20 are assembled and welded in the horizontal state. During welding of the left-right structure 20, the welds between the several segments of the left-right structure 20 are only spot-welded, and the several segments of the left-right structure 20 are separated after welding of the left-right structure 20 is completed. The segments of the left-right structure 20 are manufactured in a horizontal state, and can be transported and installed in a horizontal state. The lifting point is arranged on the truss assembly during installation, and the left-right structure 20 is installed after being turned over by 90°. During turning over, the truss assembly is the main force-bearing structure, and the shell does not have obvious deformation. The several segments are integrally assembled and separately welded during manufacturing, and then the several segments are separated, which can ensure the butt joint accuracy between the segments.

[0056] For example, the truss assembly and the shell of the lower right-angle structure 30 are respectively manufactured in an upright state, and then the truss assembly of the lower right-angle structure 30 and the shell of the lower right-angle structure 30 are assembled and welded in the upright state, and the shell is located above the truss assembly during assembly. The manufactured lower right-angle structure 30 can be hoisted, transported, and installed in an upright state, and does not need to be turned over during installation.

[0057] Exemplarily, the upper structure 40 is divided into several segments, and each segment is manufactured in a horizontal state. Each segment of the upper structure 40 is manufactured by first manufacturing the truss assembly and the shell in a horizontal state, and then assembling and welding the truss assembly and the shell in a horizontal state. During assembly, the shell is located below the truss assembly. Due to the large span of the upper structure 40, the upper structure 40 is divided into several segments to avoid deformation during lifting. The several segments of the completed upper structure 40 can be lifted, transported, and installed in a horizontal state, and do not need to be turned over during installation. The lifting lugs are arranged on the truss assembly.

[0058] Exemplarily, the truss assembly of the lower structure 50 is divided into several segments and manufactured in a horizontal state, and the shell of the lower structure 50 is divided into several segments and manufactured in a horizontal state. Due to the large span of the lower structure 50, the lower structure 50 is divided into several segments to avoid deformation during lifting. Since the lower structure 50 is installed last, it is convenient to adjust the accuracy of each segment during the folding and installation of the large rectangular steel structure. Therefore, the truss assembly and the shell of the lower structure 50 are manufactured separately without being assembled as a whole. The several segments of the completed lower structure 50 can be lifted, transported, and installed in a horizontal state, and do not need to be turned over during installation.

[0059] In an embodiment, the rectangular flanges of the completed upper right-angle structure 10, the left-right structure 20, the lower right-angle structure 30, the upper structure 40, and the lower structure 50 are processed and formed.

[0060] Exemplarily, the rectangular flanges of the upper right-angle structure 10, the left-right structure 20, the lower right-angle structure 30, the upper structure 40, and the lower structure 50 are processed separately. Due to the small processing area, the processing cost and difficulty of the rectangular flanges are greatly reduced, the requirements for processing equipment are also low, resource demand is reduced, synchronous processing is possible, and the construction period is saved.

[0061] Step 4: Adjust the position accuracy of the rectangular flange 200 to ensure that the end faces of the rectangular flanges 200 of the upper right-angle structure 10, the left-right structure 20, the lower right-angle structure 30, the upper structure 40, and the lower structure 50 are perpendicular to and coplanar with the ground, and complete the welding of the upper right-angle structure 10, the left-right structure 20, the lower right-angle structure 30, the upper structure 40, and the lower structure 50.

[0062] The position accuracy of the large rectangular steel structure 1 is adjusted after the installation of several segments, and the end face of the rectangular flange 200 of the several segments is used as the reference for adjustment, so as to ensure the flatness and perpendicularity of the end face of the rectangular flange 200 of each segment, ensure the overall accuracy of the rectangular flange 200 of the large rectangular steel structure, and avoid a large amount of accuracy adjustment and polishing in the subsequent process. After the welding of the upper right-angle structure 10, the left-right structure 20, the lower right-angle structure 30, the upper structure 40, and the lower structure 50 is completed, the weld reinforcement of the rectangular flange 200 is polished and removed to ensure the flatness of the rectangular flange 200.

[0063] Step 5: Referring to Figures 11-12 , the spatial position of the end face of the rectangular flange 200 is measured, and the position accuracy of the large rectangular steel structure 1 is locally adjusted to make the elevation, coaxiality, and planar position of the end face of the rectangular flange 200 meet the design requirements, and the welding of the inlet end face of the shell 300 and the embedded steel plate 60 is completed.

[0064] The elevation, coaxiality, and planar position of the end face of the rectangular flange 200 meet the design requirements, including adjusting the perpendicularity and planar position of the end face of the rectangular flange 200 by inserting different thickness gaskets between the embedded steel plate 60 and the inlet end face of the shell 300, adjusting the elevation of the rectangular flange 200 by setting a jack at the bottom of the truss assembly 100, and adjusting the coaxiality of the rectangular flange 200 and the concrete pipeline 2 by inserting different thickness gaskets at the connection between the truss assembly 100 and the shell 300. The elevation, coaxiality, and planar position of the end face of the rectangular flange 200 meet the design requirements. The welding of the inlet end face of the shell 300 and the embedded steel plate 60 is completed. After the welding of the large rectangular steel structure 1 is completed, welding deformation will occur, which will affect the flatness and perpendicularity of the rectangular flange 200. Therefore, a series of measures are needed to adjust the position accuracy of the rectangular flange 200 to avoid reprocessing the flange.

[0065] For example, a three-dimensional scanner is used to scan the rectangular flange 200, and mechanical tools can be used to polish the positions with local position accuracy exceeding the tolerance until the flatness and perpendicularity of the rectangular flange 200 are qualified.

[0066] For example, the upper right-angle structure 10, the left-right structure 20, the lower right-angle structure 30, the upper structure 40, and the lower structure 50 are temporarily connected and fixed to the embedded steel plate 60 by using a bolt assembly 400.

[0067] For example, after the welding of the upper right-angle structure 10, the left-right structure 20, the lower right-angle structure 30, the upper structure 40, and the lower structure 50 is completed, the weld reinforcement of the rectangular flange 200 is polished and removed.

[0068] Through the above measures, the overall on-site machining of the large rectangular flange 200 can be avoided, while the accuracy requirements of the segmented machining rectangular flange 200 after the overall butt welding of the rectangular flange 200 are ensured, so that the purposes of saving cost and construction period and reducing construction difficulty are achieved.

[0069] Step 6: The inner wall of the concrete pipeline 2 is subjected to secondary grouting in the interface range of the concrete pipeline 2 and the large rectangular steel structure 1.

[0070] The pressure grouting repair is performed at the gap position of the interface of the large rectangular steel structure 1 and the concrete pipeline 2. The accuracy of the airflow profile formed by the inner wall of the large rectangular steel structure 1 and the inner wall of the concrete pipeline 2 is measured by using a template, and the unqualified places are marked and the secondary grouting layer and the pressure grouting layer are polished.

[0071] Since the installation position of the rectangular flange end face and the flatness and perpendicularity of the rectangular flange end face need to be ensured, there is a gap and a misalignment at the interface position of the large rectangular steel structure 1 and the concrete pipeline 2. At the same time, the manufacturing accuracy of the concrete pipeline 2 is low, and the allowable error is large, which also causes the gap and misalignment at the interface position of the large rectangular steel structure 1 and the concrete pipeline 2. Therefore, by performing secondary grouting on the inner wall of the concrete pipeline 2, simultaneously performing pressure grouting at the gap, and finally polishing the secondary grouting layer and the pressure grouting layer, the interface quality of the large rectangular steel structure 1 and the concrete pipeline 2 can be ensured, the accuracy of the airflow profile can be ensured, and the deviation caused by the butt joint of the two different materials and structures can be eliminated.

[0072] The present application provides a large rectangular steel structure connected with a concrete pipeline 2, referring to Figures 1-2 , comprising: a truss assembly 100, a rectangular flange 200, a shell 300 and a bolt assembly 400, the truss assembly 100 is arranged around the outer contour of the shell 300 for increasing the overall rigidity of the steel structure component; the shell 300 is a hollow rectangular structure, the inlet end of the shell 300 is connected with the outlet end of the concrete pipeline through the bolt assembly 400, and the outlet end of the shell 300 is connected with other steel structure components of the pipeline equipment through the rectangular flange 200.

[0073] For example, the legs of the bottom of the truss assembly 100 are fixed to the ground, and the truss assembly 100 is bolted to the shell 300.

[0074] For example, the inner wall of the large rectangular steel structure 1 and the inner wall of the concrete pipeline jointly form an airflow profile.

[0075] The present application adopts a process of segmented manufacturing and processing of the rectangular flange, overall installation and forming based on the flange face, and finally fine adjustment and polishing, which solves the problems of high cost, great difficulty and long construction period of overall on-site machining of the large rectangular flange.

[0076] The large rectangular steel structure 1 is designed as multiple segments and parts for independent manufacturing or combined manufacturing, and a segmented hoisting, in-situ assembling, lifting and other combined installation process is adopted, so that the technical problems of large deformation and difficult installation in a limited space of the large rectangular steel structure with poor bending resistance are solved.

[0077] The application develops a high-precision butt joint process of the concrete pipeline 2 and the steel structure part, solves the problem of low butt joint precision of different materials and structures, and guarantees the airflow profile precision of the interface range of the concrete pipeline 2 and the large rectangular steel structure.

[0078] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for installing a large rectangular steel structure connected to a concrete pipe, characterized in that: A large rectangular steel structure connected to a concrete pipe comprises: a truss assembly, a rectangular flange, a shell, and a bolt assembly; the truss assembly is arranged around the outer contour of the shell to increase the overall rigidity of the steel structure component; the shell is a hollow rectangular structure, the inlet end of the shell is connected to the outlet end of the concrete pipe via the bolt assembly, and the outlet end of the shell is connected to other steel structure components of the pipeline equipment via the rectangular flange, comprising the following steps: According to the design drawings, the large rectangular steel structure is divided into upper right-angle structure, left and right structures, lower right-angle structure, upper structure, and lower structure, and then manufactured in sections; Processing and forming the rectangular flanges of the upper right-angle structure, the left and right structures, the lower right-angle structure, the upper structure, and the lower structure; Install and fix the lower right-angle structure, install and fix the several segments of the left and right structures in order from bottom to top, install and fix the upper right-angle structure, assemble and weld the several segments of the upper structure on the projected ground of the upper structure installation position, lift the welded upper structure as a whole to the upper part and install and fix it, install and fix the truss assembly of the lower structure, and then install the shell of the lower structure on the truss assembly to form a large rectangular steel structure; Adjust the position accuracy of the rectangular flange to ensure that the rectangular flange end faces of the upper right-angle structure, the left and right structures, the lower right-angle structure, the upper structure, and the lower structure are perpendicular to the ground and coplanar, and complete the welding of the upper right-angle structure, the left and right structures, the lower right-angle structure, the upper structure, and the lower structure; Measure the spatial position of the rectangular flange end face, locally adjust the position accuracy of the large rectangular steel structure, so that the elevation, coaxiality, and plane position of the rectangular flange end face meet the design requirements, and complete the welding of the shell inlet end face and the embedded steel plate; Secondary grouting is performed on the inner wall of the concrete pipe within the interface between the concrete pipe and the large rectangular steel structure.

2. The method for installing a large rectangular steel structure connected to a concrete pipe according to claim 1, characterized in that: The large rectangular steel structure is formed by installing the upper right-angle structure, lower right-angle structure, left and right structures, upper structure and lower structure in sections, including: Installing and fixing the lower right-angle structure; The sections of the left and right structures are installed and fixed in order from bottom to top; Installing and fixing the upper right-angle structure; Assembling and welding the several segments of the superstructure on the projected ground of the superstructure installation position, and lifting the welded superstructure as a whole to the upper part for installation and fixation; The truss assembly of the lower structure is installed and fixed, and then the shell of the lower structure is installed on the truss assembly.

3. The method for installing a large rectangular steel structure connected to a concrete pipe according to claim 1, characterized in that: The upper right-angle structure is located at the corner end of the upper part of the large rectangular steel structure and is L-shaped. The upper right-angle structure is symmetrical about the axis of the large rectangular steel structure. The lower right-angle structure is located at the corner end of the lower part of the large rectangular steel structure and is L-shaped. The lower right-angle structure is symmetrical about the axis of the large rectangular steel structure. The left and right structures are located on the left and right sides of the large rectangular steel structure, and the left and right structures are symmetrical about the axis of the large rectangular steel structure; The upper structure is located at the upper position of the large rectangular steel structure, and the lower structure is located at the lower position of the large rectangular steel structure.

4. The method for installing a large rectangular steel structure connected to a concrete pipe according to claim 1, characterized in that: The truss assembly and the shell of the upper right-angle structure are respectively manufactured in a vertical state, and then the truss assembly of the upper right-angle structure and the shell of the upper right-angle structure are assembled and welded in a vertical state; The left and right structures are divided into several sections. During manufacture, the truss assemblies and shells of the left and right structures are assembled in a horizontal state, and then the truss assemblies of the left and right structures and the shells of the left and right structures are assembled and welded in a horizontal state. When welding the left and right structures, the welds between the sections of the left and right structures are only spot welded, and after the left and right structures are welded, the sections of the left and right structures are separated. The truss assembly and the shell of the lower right-angle structure are respectively manufactured in a vertical state, and then the truss assembly of the lower right-angle structure and the shell of the lower right-angle structure are assembled and welded in a vertical state; The upper structure is divided into several sections and each section is manufactured in a horizontal state. When manufacturing each section of the upper structure, the truss assembly and the shell are first manufactured in a horizontal state and then the truss assembly and the shell are assembled and welded in a horizontal state. The truss assembly of the lower structure is divided into several sections and each section is manufactured in a horizontal state. The shell of the lower structure is divided into several sections and each section is manufactured in a horizontal state.

5. The method for installing a large rectangular steel structure connected to a concrete pipe according to claim 1, characterized in that: After the upper right-angle structure, the left and right structures, the lower right-angle structure, the upper structure, and the lower structure are installed in place, a bolt assembly is used to temporarily connect and fix the upper right-angle structure, the left and right structures, the lower right-angle structure, the upper structure, and the lower structure to the embedded steel plate.

6. The method for installing a large rectangular steel structure connected to a concrete pipe according to claim 1, characterized in that: After the upper right-angle structure, the left and right structures, the lower right-angle structure, the upper structure, and the lower structure are welded, the weld excess height of the rectangular flange is ground off.

7. The method for installing a large rectangular steel structure connected to a concrete pipe according to claim 1, characterized in that: Ensuring that the elevation, coaxiality, and plane position of the rectangular flange end face meet the design requirements includes: Insert gaskets of different thicknesses between the embedded steel plate and the shell inlet end face to adjust the verticality and plane position of the rectangular flange end face; A jack is set at the bottom of the truss assembly to adjust the elevation of the rectangular flange; Gaskets of different thicknesses are inserted into the connection between the truss assembly and the shell to adjust the coaxiality of the rectangular flange and the concrete pipe.

8. The method for installing a large rectangular steel structure connected to a concrete pipe according to claim 1, characterized in that: Pressure grouting repair is carried out at the gap between the interface of large rectangular steel structure and concrete pipe.

9. The method for installing a large rectangular steel structure connected to a concrete pipe according to claim 1, characterized in that: A template is used to measure the accuracy of the airflow profile formed by the inner wall of the large rectangular steel structure and the inner wall of the concrete pipe. Unqualified areas are marked, and the secondary grouting layer and pressure grouting layer are repaired.

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