Construction method for framed bent type structure frame body in wind tunnel flow channel diffusion section

Abstract

The invention discloses a construction method for an internal bent frame type structure frame body of a wind tunnel flow channel diffusion section. The construction method comprises the steps that P1, structural design is conducted on an inner steel formwork unit and a profile steel structure supporting frame unit; p2, after being machined, the inner steel formwork unit and the profile steel structure supporting frame unit are inspected to be qualified and conveyed to a construction site; p3, on-site positioning and paying-off of all the section sections of the inner steel formwork units are conducted; and P4, positioning installation of the inner steel formwork unit and the profile steel structure supporting frame unit is conducted, before installation, a BIM engineer makes installation animation demonstration through an inner steel formwork BIM model, visual disclosure is conducted on field management personnel and workers, and the workers conduct installation of an inner formwork supporting system according to the sequence of animation demonstration. According to the method, the wind tunnel flow channel diffusion section is gradually changed from a polygonal shape to a square shape in the horizontal direction, the construction problem of an ultra-large wind tunnel circular-to-square diffusion section is effectively solved, an internal mold supporting system meeting the construction precision requirement can be built by applying the method, and smooth construction is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnel construction, and in particular to a method for constructing a rack-type structural frame inside a wind tunnel flow channel diffusion section. Background Art

[0002] The diffuser section of the flow channel in the wind tunnel is designed to make a smooth transition between the fan room and the test section. It is a key part of the wind tunnel design. The diffuser section of the flow channel is usually designed to gradually transition from the polygonal or circular cross-section of the fan room to the square cross-section of the test section. This design requires very high precision to ensure a smooth transition of the airflow during the diffusion process and avoid unnecessary turbulence and pressure loss. Since the length of the diffuser section is usually more than 30 meters, as the inner wall of the wind tunnel flow channel, in order to ensure the quality of the test section flow channel, such as the uniformity of airflow velocity distribution, the deviation of the average airflow direction from the wind tunnel axis, the pressure gradient along the wind tunnel axis, the uniformity of the cross-sectional temperature distribution, the turbulence of the airflow and the noise level, the spatial positioning and the inner surface flatness deviation must not exceed 5mm. At the same time, due to the extremely high airflow velocity in the wind tunnel, reaching 250km / h, it is strictly forbidden to repair the inner surface later. It can be seen that the construction of an automobile wind tunnel requires very high construction accuracy for the inner wall of the wind tunnel. Therefore, the construction of the inner mold support system is the most critical step. Moreover, since the diffusion section of the wind tunnel is a gradually deformed structure, the size of each cross-section is different. Therefore, during the construction process, the traditional wooden formwork plus steel pipe scaffolding formwork system can no longer meet the on-site construction and quality accuracy requirements. Summary of the invention

[0003] The present invention aims to solve the deficiencies of the prior art and provides a method for constructing a rack-type structural frame inside a diffuser section of a wind tunnel flow channel.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for constructing a bent-frame structure frame inside a wind tunnel flow channel diffusion section, the steps of which are as follows:

[0006] P1. Structural design of the internal steel formwork unit and the steel structure support frame unit. When designing the internal steel formwork unit and the steel structure support frame unit, the BIM engineer conducts 3D modeling of the wind tunnel flow channel diffusion section structure according to the construction drawings, establishes a project prefabrication processing family library, draws drawings of each cross-section, and feeds back the family library template information to the internal steel formwork processing manufacturer. The manufacturer directly extracts the template model size information to process the internal steel cylinder formwork;

[0007] P2. After the inner steel formwork unit and the steel structure support frame unit are processed and inspected, they are transported to the construction site and the project department organizes the material acceptance;

[0008] P3. Carry out on-site positioning and laying out of each cross-section of the internal steel formwork unit;

[0009] P4. Position and install the internal steel formwork units and steel structure support frame units. Before installation, the BIM engineer uses the internal steel formwork BIM model to create an installation animation demonstration and conducts visual briefings to on-site managers and workers. The workers install the internal formwork support system according to the order of the animation demonstration.

[0010] The steel structure support frame unit comprises support columns and support truss horizontal beams. The support truss horizontal beams are arranged vertically and horizontally between the support columns. Connecting plates are welded between adjacent support columns. Scissor braces are obliquely arranged between the support columns.

[0011] The inner steel template unit is spliced ​​by multiple steel templates, the face plate of the steel template is a steel plate, the frame and ribs of the steel template are steel strips, the longitudinal ribs on the steel template are channel steel, and the back ribs of the steel template are channel steel.

[0012] The inner steel formwork unit comprises downward inclined angle steel formworks respectively arranged at the lower parts of the inner wall width direction of the wind tunnel flow channel diffusion section for pouring concrete and side wall steel formworks fitted to the inner walls on both sides of the wind tunnel flow channel diffusion section.

[0013] The upper inclined steel formwork on both sides of the wind tunnel flow channel diffusion section in the width direction is supported on the steel structure support frame unit through screw supports, and the top horizontal steel formwork is supported on the steel structure support frame unit through adjustable foot supports.

[0014] Several groups of screw support assemblies are supported between the side wall steel templates of the inner walls on both sides of the wind tunnel flow channel diffusion section. The screw support assemblies are composed of two screw supports, a horizontal screw and an inclined screw, and the screw supports are set on the supporting columns.

[0015] The screw support comprises an adjusting rod and a threaded rod connected at both ends, the outer end of the threaded rod is connected with a positioning hole plate, and the positioning hole plate is aligned and matched with a limiting hole plate arranged on the back rib of the side wall steel template.

[0016] The bottom steel template of the inner steel template unit is tilted downward, and a bottom plate connecting plate is arranged on the bottom steel template, and the bottom plate connecting plate is connected to the supporting column.

[0017] The steps for positioning and installing the inner steel formwork unit in step 4 are as follows:

[0018] S1. First, the outer formwork frame of the wind tunnel flow channel diffusion section is built as a whole. The outer formwork frame adopts a disc-type scaffolding, and the outer bottom layer and the corresponding bevel steel formwork are installed;

[0019] S2. Install the inner steel formwork unit corresponding to the bottom flat part of the inner wall steel formwork;

[0020] S3, installing the inner steel formwork unit corresponding to the bottom bevel section of the inner steel formwork unit side wall and the first horizontal supporting column of the steel structure support frame;

[0021] S4. Install the remaining inner steel formwork units of the octagonal segment and the longitudinal support columns of the steel structure support frame corresponding to the octagonal segment and the remaining horizontal beams of the support trusses. The horizontal beams of the support trusses and the longitudinal support columns are vertically connected by welding at the intersection; the support columns are spaced 1.5m apart;

[0022] S5. According to the method of step S4, starting from the octagonal segment, install the remaining inner steel formwork units and the remaining horizontal beams and longitudinal supporting columns of the supporting trusses of the steel structure support frame in a ring-by-ring manner from the octagonal segment to the rectangular segment, and install the scissors support construction and formwork construction at the same time.

[0023] In the step 1, the project department calculates the horizontal distance position size and elevation of each symmetrical inner steel formwork unit in advance according to the template block using BIM technology. After each ring is installed according to the design requirements, the horizontal distance position size and elevation of each symmetrical inner steel formwork unit are reviewed. Only after passing the test can the next ring be installed.

[0024] The beneficial effects of the present invention are as follows: the present invention gradually changes the horizontal direction of the wind tunnel flow channel diffusion section from a polygon to a square, effectively solving the construction problem of the circular-to-square diffusion section of a super-large wind tunnel. By applying this method, an internal mold support system that meets the construction accuracy requirements can be built to ensure the smooth completion of the construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an elevation view of the inner steel formwork unit and the steel structure support frame unit of the present invention;

[0026] Figure 2 It is the steel structure support frame unit and support plane layout diagram of the present invention;

[0027] Figure 3 It is a support diagram of a rectangular side segment template and a steel structure support frame unit of the present invention;

[0028] Figure 4 It is a support diagram of the variable cross-section template and the steel structure support frame unit of the present invention;

[0029] Figure 5 It is the support diagram of the octagonal segment template and the steel structure support frame unit of the present invention;

[0030] Figure 6 This is a diagram of the screw support structure of the present invention;

[0031] Figure 7 It is the steel formwork structure diagram of the present invention;

[0032] In the figure: 1-steel structure support frame unit; 11-support column; 111-connecting plate; 112-scissor brace; 113-bottom plate connecting plate; 12-support truss horizontal beam; 13-screw support; 131-adjusting rod; 132-threaded rod; 133-positioning hole plate; 14-adjustable anchor support; 2-inner steel formwork unit; 21-steel formwork; 22-back rib; 23-longitudinal rib; 24-limiting hole plate;

[0033] The following is a detailed description of the embodiments of the invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0035] like Figure 1-Figure 7 As shown, a method for constructing a rack-type structure frame inside a wind tunnel flow channel diffusion section comprises the following steps:

[0036] P1. Structural design of the inner steel formwork unit 2 and the steel structure support frame unit 1. When designing the inner steel formwork unit 2 and the steel structure support frame unit 1, the BIM engineer performs 3D modeling of the wind tunnel flow channel diffusion section structure according to the construction drawings, establishes a project prefabrication processing family library, draws drawings of each cross-section, and feeds back the family library template information to the inner steel formwork processing manufacturer, who directly extracts the template model size information to process the inner steel cylinder formwork;

[0037] After P2, the inner steel formwork unit 2 and the steel structure support frame unit 1 are processed and inspected to be qualified, they are transported to the construction site, and the project department organizes the material acceptance;

[0038] P3, conduct on-site positioning and laying out of each cross-section of the inner steel formwork unit 2;

[0039] P4. Position and install the inner steel formwork unit 2 and the steel structure support frame unit 1. Before installation, the BIM engineer uses the inner steel formwork BIM model to make an installation animation demonstration and conducts a visual briefing for on-site managers and workers. The workers install the inner formwork support system according to the order of the animation demonstration.

[0040] Installation steps of inner steel formwork unit 2:

[0041] S1. First, the outer formwork frame of the wind tunnel flow channel diffusion section is built as a whole. The outer formwork frame adopts a disc-type scaffolding, and the outer bottom layer and the corresponding bevel steel formwork 21 are installed;

[0042] S2, installing the inner steel formwork unit 2 corresponding to the bottom plane portion of the inner wall steel formwork 21;

[0043] S3, installing the inner steel formwork unit 2 and the first transverse support column 11 of the steel structure support frame 1 corresponding to the bottom bevel section of the side wall of the inner steel formwork unit 2;

[0044] S4, install the remaining inner steel formwork units 2 of the octagonal segment and the longitudinal support columns of the steel structure support frame 1 corresponding to the octagonal segment and the remaining support truss horizontal beams 12, the support truss horizontal beams 12 and the longitudinal support columns 11 are vertically connected at the intersection by welding; the support columns 11 are spaced 1.5m apart;

[0045] S5. According to the method of step S4, starting from the octagonal segment, install the remaining inner steel formwork units 2 and the remaining support truss horizontal beams 12 and longitudinal support columns 11 of the steel structure support frame 1 in a ring-by-ring manner in the direction from the octagonal segment to the rectangular segment, and install the scissors brace 112 at the same time. Support construction and formwork construction are carried out simultaneously.

[0046] The steel structure support frame unit 1 includes support columns 11 and support truss horizontal beams 12. The support truss horizontal beams 12 are arranged vertically and horizontally between the support columns 11. The support columns 11 are made of HM340*250 steel, and the support truss horizontal beams 12 are made of double 20b# I-beams. Connecting plates 111 are welded between adjacent support columns 11. The connecting plates 111 are made of single 20b# I-beams, and scissor braces 112 are obliquely arranged between the support columns 11.

[0047] The inner steel template unit 2 is spliced ​​by multiple steel templates 21, the panel of the steel template 21 is 6mm steel plate, the frame and ribs of the steel template 21 are 12*100mm steel strips, the longitudinal ribs 23 on the steel template 21 are made of 10# channel steel, and the back ribs 22 of the steel template 21 are made of 16# channel steel.

[0048] The inner steel formwork unit 2 includes lower inclined angle steel formworks 21 for pouring concrete, which are respectively arranged at the lower parts of the inner walls of the wind tunnel flow channel diffusion section in the width direction, and side wall steel formworks 21 which are fitted to the inner walls of the wind tunnel flow channel diffusion section.

[0049] The upper inclined steel templates 21 on both sides of the wind tunnel flow channel diffusion section in the width direction are supported on the steel structure support frame unit 1 through screw supports 13, and the top horizontal steel template 21 is supported on the steel structure support frame unit 1 through adjustable anchor supports 14.

[0050] Several groups of screw support assemblies are supported between the side wall steel templates 21 of the inner walls on both sides of the wind tunnel flow channel diffusion section. The screw support assembly consists of two screw supports 13, namely a horizontal screw and an inclined screw. The screw supports 13 are arranged on the support columns 11.

[0051] The screw support 13 includes an adjusting rod 131 and a threaded rod 132 connected at both ends. The outer end of the threaded rod 132 is connected to a positioning hole plate 133. The positioning hole plate 133 is aligned and connected with the limiting hole plate 24 set on the back rib 22 of the side wall steel template 21 to achieve adjustment of the support angle.

[0052] The bottom steel template 21 of the inner steel template unit 2 is tilted downward at an angle of 12 mm to facilitate demoulding. A bottom plate connecting plate 113 is provided on the bottom steel template 21. The bottom plate connecting plate 113 is connected to the supporting column 11, and the bottom connecting plate 113 is 20 mm.

[0053] The project department uses BIM technology to calculate the horizontal distance, position, dimensions and elevation of each symmetrical internal steel formwork unit 2 in advance according to the template division. After each ring is installed according to the design requirements, the horizontal distance, position, dimensions and elevation of each symmetrical internal steel formwork unit 2 are reviewed. Only after they are qualified can the next ring be installed.

[0054] When the present invention is working, the specific operation steps are as follows: Step A, use BIM technology to fully simulate and model the flow channel structure and steel formwork according to the construction drawings. Through virtual assembly, the template size data is accurately obtained piece by piece, and the steel structure support frame 1 is structurally designed and commissioned for processing; Step B, after the inner steel cylinder formwork unit 2 and the steel structure support frame unit 1 are processed, they are inspected and transported to the construction site. The project department organizes material acceptance and reviews the size, flatness, curvature, chord length and other data of each template piece by piece according to the QR code data to ensure that the design requirements are met; Step C, on-site positioning and laying out of each cross-sectional section of the inner steel cylinder formwork unit 2; Step D, erection of the external frame and installation of the external steel formwork; Step E, positioning and installation of the inner steel cylinder formwork unit 2 and the steel structure support frame unit 1; Step F, layered pouring of concrete.

[0055] In the description of the invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do 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 invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be mechanically connected, electrically connected, or able to communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0058] The invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the invention, or they are directly applied to other occasions without improvement, they are all within the scope of protection of the invention.

Claims

1. A method for constructing a bent-type structural frame inside a wind tunnel flow channel diffusion section, characterized in that: The steps are: P1. Structural design is performed on the inner steel formwork unit (2) and the steel structure support frame unit (1). When the BIM engineer performs structural design on the inner steel formwork unit (2) and the steel structure support frame unit (1), he performs three-dimensional modeling on the wind tunnel flow channel diffusion section structure according to the construction drawings, establishes a project prefabrication processing family library, draws drawings of each cross-section section, and feeds back the family library template information to the inner steel formwork processing manufacturer, and the manufacturer directly extracts the template model size information to process the inner steel cylinder template; After the processing of P2, the inner steel formwork unit (2) and the steel structure support frame unit (1) is completed and inspected to be qualified, they are transported to the construction site and the project department organizes the material acceptance; P3, conducting on-site positioning and laying out of each cross-section of the inner steel formwork unit (2); P4. Position and install the inner steel formwork unit (2) and the steel structure support frame unit (1). Before installation, the BIM engineer uses the inner steel tube formwork BIM model to create an installation animation demonstration and conducts a visual briefing to on-site management personnel and workers. The workers install the inner formwork support system according to the order of the animation demonstration.

2. A method for constructing a bent-type structural frame inside a wind tunnel flow passage diffusion section according to claim 1, characterized in that: The steel structure support frame unit (1) comprises support columns (11) and support truss horizontal beams (12), wherein the support truss horizontal beams (12) are arranged vertically and horizontally between the support columns (11), connecting plates (111) are welded between adjacent support columns (11), and scissor braces (112) are obliquely arranged between the support columns (11).

3. The method for constructing a bent-type structural frame inside a wind tunnel flow passage diffusion section according to claim 2, characterized in that: The inner steel template unit (2) is spliced ​​by multiple steel templates (21), the face plate of the steel template (21) is a steel plate, the frame and ribs of the steel template (21) are steel strips, the longitudinal ribs (23) on the steel template (21) are channel steel, and the back ribs (22) of the steel template (21) are channel steel.

4. The method for constructing a bent-type structural frame inside a wind tunnel flow passage diffusion section according to claim 3 is characterized in that: The inner steel formwork unit (2) comprises downwardly inclined angle steel formworks (21) respectively arranged at the lower parts of the inner wall of the wind tunnel flow channel diffusion section in the width direction for pouring concrete, and side wall steel formworks (21) fitted to the inner walls of the wind tunnel flow channel diffusion section on both sides.

5. The method for constructing a bent-type structural frame inside a wind tunnel flow passage diffusion section according to claim 4 is characterized in that: The upper inclined steel templates (21) on both sides of the wind tunnel flow channel diffusion section in the width direction are supported on the steel structure support frame unit (1) through screw supports (13), and the top horizontal steel template (21) is supported on the steel structure support frame unit (1) through adjustable foot supports (14).

6. The method for constructing a bent-type structure frame inside a wind tunnel flow passage diffusion section according to claim 5, characterized in that: A plurality of groups of screw support assemblies are supported and arranged between the side wall steel templates (21) of the inner walls on both sides of the wind tunnel flow channel diffusion section. The screw support assemblies are composed of two screw supports (13), namely a horizontal screw and an inclined screw. The screw supports (13) are arranged on the support columns (11).

7. The method for constructing a bent-type structure frame inside a wind tunnel flow passage diffusion section according to claim 6, characterized in that: The screw support (13) comprises an adjusting rod (131) and a threaded rod (132) connected at both ends, the outer end of the threaded rod (132) is connected to a positioning hole plate (133), and the positioning hole plate (133) is aligned and matched with a limiting hole plate (24) provided on the back rib (22) of the side wall steel template (21).

8. The method for constructing a bent-type structure frame inside a wind tunnel flow passage diffusion section according to claim 7, characterized in that: The bottom steel template (21) of the inner steel template unit (2) is tilted downward, and a bottom plate connecting plate (113) is arranged on the bottom steel template (21), and the bottom plate connecting plate (113) is connected to the supporting column (11).

9. The method for constructing a bent-type structure frame inside a wind tunnel flow passage diffusion section according to claim 8, characterized in that: The steps of positioning and installing the inner steel formwork unit (2) in step P4 are as follows: S1. First, the outer formwork frame of the wind tunnel flow channel diffusion section is built as a whole. The outer formwork frame adopts a disc-type scaffolding, and the outer bottom layer and the corresponding bevel steel formwork (21) are installed; S2, installing the inner steel formwork unit (2) corresponding to the bottom plane portion of the inner wall steel formwork (21); S3, installing the inner steel formwork unit (2) corresponding to the bottom bevel section of the side wall of the inner steel formwork unit (2) and the first transverse supporting column (11) of the steel structure supporting frame (1); S4, installing the remaining inner steel formwork units (2) of the octagonal segment and the longitudinal support columns of the steel structure support frame (1) corresponding to the octagonal segment and the remaining support truss horizontal beams (12), the support truss horizontal beams (12) and the longitudinal support columns (11) are vertically connected at the intersection by welding; the support columns (11) are spaced 1.5 m apart; S5. According to the method of step S4, starting from the octagonal section, the remaining inner steel formwork units (2) and the remaining support truss horizontal beams (12) and longitudinal support columns (11) of the steel structure support frame (1) are installed ring by ring in the direction from the octagonal section to the rectangular section, and the scissors brace (112) is installed at the same time. The support construction and formwork construction are carried out simultaneously.

10. A method for constructing a bent-type structural frame inside a wind tunnel flow passage diffusion section according to claim 9, characterized in that: In step P1, the project department calculates the horizontal distance position size and elevation of each symmetrical inner steel formwork unit (2) in advance according to the template block using BIM technology. After each ring is installed according to the design requirements, the horizontal distance position size and elevation of each symmetrical inner steel formwork unit (2) are reviewed. Only after they are qualified can the next ring be installed.

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