Unit type hoisting construction method for double-column longitudinal beam type steel structure pipe gallery

Abstract

The invention relates to the technical field of steel structure construction, and discloses a double-column longitudinal beam type steel structure pipe gallery unit type hoisting construction method which comprises the steps that a pipe gallery structure is divided into a plurality of hoisting units according to a pipe gallery design structure diagram; an assembling platform is manufactured on a construction site, all components of the pipe gallery transported to the construction site are pre-assembled, and all the hoisting units are formed; all the hoisting units are hoisted, and all the hoisting units are temporarily connected and fixed; and after one independent subsection of the pipe gallery is hoisted, all the hoisting units are permanently connected and fixed. According to the construction method, the pipe gallery is divided into a plurality of hoisting units, all components are pre-assembled on a construction site to form the hoisting units, and then the construction operation of the double-column longitudinal beam type steel structure pipe gallery can be completed only by hoisting the hoisting units. The number of aloft work can be reduced, the construction efficiency of the pipe gallery is improved, the process conversion frequency is increased, and the engineering cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel structure construction, and in particular to a unit-type hoisting construction method for a double-column longitudinal beam steel structure pipe gallery. Background Art

[0002] At present, the public overhead steel structure integrated pipe gallery is a new type of pipe gallery structure that can be promoted in industrial parks. Among them, the double-column longitudinal beam steel structure pipe gallery is widely used as a main structural type, but the construction of this project generally has the following disadvantages:

[0003] 1. The process conversion efficiency is low and the construction progress is slow;

[0004] 2. The lifting frequency is high and the cost of machinery use is high;

[0005] 3. There are many high-altitude welding operations, which poses great safety risks;

[0006] 4. Material waste and environmental pollution are serious. Summary of the invention

[0007] The present invention is made to solve the above-mentioned technical problems, and its purpose is to provide a unit-type hoisting construction method for a double-column and longitudinal-beam steel structure corridor, which can improve the installation and construction efficiency of the double-column and longitudinal-beam steel structure corridor.

[0008] In order to achieve the above object, the present invention provides a double-column longitudinal beam steel structure pipe gallery unit type hoisting construction method, comprising the following steps:

[0009] According to the pipe gallery design structure drawing, the pipe gallery structure is divided into multiple hoisting units;

[0010] An assembly platform is manufactured at the construction site to pre-assemble the components of the pipe gallery transported to the construction site to form the hoisting units;

[0011] Hoisting each of the hoisting units, and temporarily connecting and fixing each of the hoisting units;

[0012] After the hoisting of an independent section of the pipe gallery is completed, each hoisting unit is permanently connected and fixed.

[0013] As an embodiment, the assembly platform is arranged along the pipeline corridor line, and includes a horizontal tire frame unit formed by splicing steel frames.

[0014] As an embodiment, the assembly platform is formed by splicing a plurality of the horizontal tire frame units through bolts and connecting plates.

[0015] As an implementation mode, when manufacturing the assembly platform, universal wheels are also provided below the horizontal tire frame unit.

[0016] As an implementation mode, pre-assembling each of the hoisting units includes: connecting the left and right steel columns with the inter-column beams, diagonal supports, and stiffening plates together to form a double-column frame unit; connecting the platform longitudinal beams with the platform cross beams, diagonal supports, and stiffening plates together to form a frame beam platform unit.

[0017] As an embodiment, the connection is welding or bolt connection followed by welding.

[0018] As an implementation mode, the lifting of each lifting unit includes: first, using a truck crane to lift the first and second span double-column frame units, setting at least two lifting points during lifting to ensure that the double columns are lifted vertically, and after correction and placement, using double-column base plates and embedded anchor bolts to temporarily fix them; then, lifting the lowest-level frame beam platform unit, setting four lifting points during lifting to ensure that the frame beam platform is lifted horizontally, and after correction and placement, installing bolts to temporarily connect and fix the platform longitudinal beam and the double-column beam connecting plate; then, lifting the upper-level frame beam platform in sequence until the entire span unit structure is lifted.

[0019] As an implementation method, the permanent connection and fixation of each lifting unit includes: the column base plate and the foundation anchor bolts are fastened with double nuts; the installation bolts of the platform longitudinal beam and the column node plate are replaced with permanent high-strength bolts, and the tightening sequence and initial tightening and final tightening torques of the permanent high-strength bolt connection pair should meet the design requirements; the upper and lower supporting components of the frame beam platform are welded and reinforced to complete the installation and construction of the entire corridor structure.

[0020] As an implementation method, before pre-assembly, all components are fully measured and inspected, including specifications, dimensions, thickness, and surface corrosion.

[0021] As an implementation mode, before hoisting each of the hoisting units, all column base positions, elevations, axes, anchor bolt positions and extension lengths are inspected and accepted before construction can begin.

[0022] According to the above description and practice, the double-column longitudinal beam steel structure corridor unit-type hoisting construction method described in the present invention divides the corridor into multiple hoisting units, and pre-assembles each component at the construction site to form these hoisting units. After that, only these hoisting units need to be hoisted to complete the construction of the double-column longitudinal beam steel structure corridor. Compared with hoisting operations for all components, this construction method can reduce the number of high-altitude operations. Pre-assembling hoisting units on the ground is obviously more efficient than high-altitude hoisting, which improves the construction efficiency of the corridor, speeds up the frequency of process conversion, and saves engineering costs. This construction method changes most of the high-altitude assembly operations to ground assembly operations, improves safety, makes it easier to control the quality of the project, reduces rework caused by quality problems, and meets environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a standard structural diagram of a double-column and longitudinal-beam steel structure corridor involved in one embodiment of the present invention.

[0024] Figure 2 The present invention is a flowchart of a unit-type hoisting construction method for a double-column longitudinal beam steel structure corridor involved in one embodiment of the present invention.

[0025] Figure 3 This is a division diagram of the hoisting units in a double-column and longitudinal-beam steel structure corridor involved in one embodiment of the present invention.

[0026] Figure 4 The present invention is a construction sequence diagram of a hoisting unit in a double-column longitudinal beam steel structure corridor according to an embodiment of the present invention.

[0027] Figure 5 It is a structural schematic diagram of an assembly platform in a double-column and longitudinal-beam steel structure corridor involved in one embodiment of the present invention. DETAILED DESCRIPTION

[0028] The exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and fully convey the concepts of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0029] In this embodiment, a unit-type hoisting construction method of a double-column longitudinal beam steel structure pipe gallery is disclosed. The double-column longitudinal beam steel structure pipe gallery has the characteristics of batch production and standardization. Its structure is mainly divided into steel columns, inter-column beams, platform longitudinal beams, platform cross beams, cantilever beams and various supporting components. The basic span is 9-12 meters, and every 50 meters or so is an independent structural segment. It is generally designed as a 1-3-layer pipeline installation platform. The connection nodes of the platform longitudinal beam and the steel column are generally hinged with high-strength bolts, and the nodes between the cross beam and the longitudinal beam, and the cross beam and the steel column are generally welded rigid connections.

[0030] The unit-type hoisting construction method of the double-column longitudinal beam steel structure pipe gallery mainly includes the following steps:

[0031] First, according to the pipeline corridor design structure diagram, the pipeline corridor structure is divided into multiple hoisting units;

[0032] Afterwards, an assembly platform is manufactured at the construction site, and the components of the pipe gallery transported to the construction site are pre-assembled to form the hoisting units;

[0033] Secondly, hoisting each of the hoisting units, and temporarily connecting and fixing each of the hoisting units;

[0034] Finally, after the hoisting of an independent section of the pipe gallery is completed, each hoisting unit is permanently connected and fixed.

[0035] According to the above description and practice, the double-column longitudinal beam steel structure corridor unit-type hoisting construction method described in the present invention divides the corridor into multiple hoisting units, and pre-assembles each component at the construction site to form these hoisting units. After that, only these hoisting units need to be hoisted to complete the construction of the double-column longitudinal beam steel structure corridor. Compared with hoisting operations for all components, this construction method can reduce the number of high-altitude operations. Pre-assembling hoisting units on the ground is obviously more efficient than high-altitude hoisting, which improves the construction efficiency of the corridor, speeds up the frequency of process conversion, and saves engineering costs. This construction method changes most of the high-altitude assembly operations to ground assembly operations, improves safety, makes it easier to control the quality of the project, reduces rework caused by quality problems, and meets environmental protection requirements.

[0036] As an implementation method, the assembly platform is arranged along the route of the pipeline corridor, including a horizontal frame unit formed by splicing steel frames, which can assemble the corresponding lifting units nearby, which is conducive to improving construction efficiency. Further, the assembly platform is composed of multiple horizontal frame units spliced ​​by bolts and connecting plates, which is convenient for construction personnel to quickly set up these assembly platforms. Furthermore, when making the assembly platform, universal wheels are also arranged below the horizontal frame unit to facilitate the movement of the assembly platform.

[0037] As an implementation method, pre-assembly to form each hoisting unit includes: connecting the left and right steel columns with the inter-column crossbeam, diagonal support, and stiffening plate to form a double-column frame unit; connecting the platform longitudinal beam with the platform crossbeam, diagonal support, and stiffening plate to form a frame beam platform unit. In this way, the relatively scattered steel components in the adjacent areas can be pre-assembled into a relatively regular hoisting unit in the ground area. The connection is welding or bolt connection before welding, which can be carried out according to the design drawings of the adjacent steel components. Welding alone can directly and permanently fix these components together. Bolting before welding can temporarily fix larger steel components with bolts before welding, which facilitates the smooth completion of welding operations. As an implementation method, before pre-assembly, all components are also fully measured and inspected, and the inspection content includes specifications, dimensions, thickness, and surface corrosion. Ensure that the quality of each hoisting unit after pre-assembly meets the design requirements.

[0038] As an implementation method, the hoisting of each hoisting unit includes: first, using a car crane to hoist the first and second span double-column frame units, at least two hoisting points are set during hoisting to ensure the vertical hoisting of the double columns, and after correction and placement, the double-column column foot plates and pre-buried anchor bolts are used for temporary fixation; then, the lowest frame beam platform unit is hoisted, and four hoisting points are set during hoisting to ensure the horizontal hoisting of the frame beam platform, and after correction and hoisting in place, the platform longitudinal beam and the double-column beam connecting plate are temporarily connected and fixed by installing bolts; then, the upper frame beam platform is hoisted in turn until the hoisting of the entire span unit structure is completed. This method can assemble each hoisting unit into a completed pipe gallery structure in an orderly manner. As an implementation method, before hoisting each hoisting unit, all column base positions, elevations, axes, anchor bolt positions and extension lengths are also inspected and accepted before construction. It can ensure that the constructed pipe gallery structure is strong enough.

[0039] Furthermore, each lifting unit is permanently connected and fixed, including: the column base plate and the foundation anchor bolts are fastened with double nuts; the installation bolts of the platform longitudinal beam and the column node plate are replaced with permanent high-strength bolts, and the tightening sequence and initial and final tightening torques of the permanent high-strength bolt connection pair should meet the design requirements; the upper and lower supporting components of the frame beam platform are welded and reinforced to complete the installation and construction of the entire corridor structure.

[0040] Please combine Figures 2 to 5 In a specific embodiment, the double-column longitudinal beam steel structure pipe gallery unit-type hoisting construction method comprises the following steps:

[0041] First, prepare for construction.

[0042] (1) The foundation construction shall be carried out in strict accordance with the design requirements. The anchor bolt embedding accuracy shall comply with the requirements of the "Standard for Acceptance of Steel Structure Construction Quality" GB50205, as shown in Table 1 below:

[0043] Table 1:

[0044] project Permissible deviation Anchor bolt center offset ±2mm Anchor bolt exposed length +5mm Thread length +5mm

[0045] (2) The layout, cutting, processing and installation of steel structures are all based on on-site surveying and mapping data.

[0046] (3) Before installing the steel column, all column base positions, elevations, axis lines, anchor bolt positions and extension lengths must be inspected and accepted before construction can begin.

[0047] Second, steel components are inspected and accepted on site.

[0048] (1) When steel components leave the factory, the manufacturer shall submit product qualification certificates, including: a. Documents of changes to construction drawings; b. Quality certificates and test reports of steel connection materials and coating materials; c. Quality inspection and acceptance records of beam and column manufacturing; d. Pre-assembly records; e. Shipping list of components and spare parts, etc.

[0049] (2) Steel components should be fully measured and inspected when they arrive at the site. The inspection contents include specifications, dimensions, thickness, and surface corrosion. The processing and production of steel components shall comply with the requirements of "Steel Structure Engineering Construction Quality Acceptance Standard" GB50205.

[0050] Third, pre-assembly of lifting units

[0051] According to the direction of the pipeline corridor, the construction site sets up a component assembly site nearby, and the steel structure assembly platform is made on site. The platform is assembled from a steel frame into a horizontal platform frame. The platform size is 2m*4m as a standard module, which can be used alone or in combination as needed. The platform steel assembly uses bolts and connecting plates to achieve quick connection and fixation. The platform support foot is designed as an adjustable base, and the diameter of the adjustment screw is not less than 36mm to facilitate quick leveling. The platform height is designed according to the principle of components and convenient operation. At the same time, in order to facilitate the transportation and movement of the platform, four sets of simple universal wheels can be added. The platform can be moved in a small range by manual or small equipment to achieve direct dragging. Long-distance transfer can be quickly disassembled into a single platform or steel parts for direct loading and transportation. One or more assembly platforms can be made according to actual needs, and they can all be used in a turnover manner. Figure 5 The structure of an assembly platform is shown.

[0052] After the steel components are delivered to the site, they are stacked near the assembly platform. After the assembly platform is adjusted, a small truck crane is used to assemble the components. The specific assembly process is as follows:

[0053] (1) Double column frame unit

[0054] The left and right steel columns are connected to the cross beams between the columns, diagonal supports, and stiffening plates. The main connection methods are welding or bolting followed by welding.

[0055] (2) Frame beam platform unit

[0056] The platform longitudinal beams are connected to the cross beams, diagonal supports and stiffening plates, and the main connection methods are welding or bolting followed by welding.

[0057] (3) The welding process is strictly carried out in accordance with the specifications to ensure that the welding quality meets the requirements of the "Steel Structure Welding Code" GB50661. After assembly, quality inspection is carried out in batches according to the specifications. After acceptance, they are placed in storage and wait for lifting.

[0058] Fourth, unit lifting

[0059] The crane is selected according to the size and weight of the component, and the lifting force calculation is performed. A reasonable lifting position is selected according to the site location, and the mid-span position is selected as much as possible, so that the entire span lifting task can be completed in one position.

[0060] (1) First, use a truck crane to hoist the first and second span double-column frame units. The double-column frame units require at least two points of hoisting to ensure that the double columns are lifted vertically. After correction and positioning, they are temporarily fixed using the double-column foot plates and pre-buried anchor bolts. Then, the lowest-level frame beam platform unit is hoisted (the frame beam platform can be hoisted by one or two cranes based on the specific size and weight after calculation). The platform is hoisted at four points to ensure that the frame beam platform is lifted horizontally. After correction and positioning, the platform longitudinal beam and the double-column beam connecting plate are temporarily connected and fixed with bolts. Then, the second and third-level frame beam platforms are hoisted in turn until the entire span unit structure is completed.

[0061] (2) The temporary connection of the double-column frame unit is fastened by the matching bolts using the column base plate and the foundation anchor leveling bolts; the four corners of the frame beam platform are temporarily connected by the connection points between the longitudinal beam and the column using mounting bolts and rivets. The number of mounting bolts and rivets inserted at each node should be determined based on the load calculation during the installation process. The number should not be less than 1 / 3 of the total number of mounting holes and the number of mounting bolts should not be less than 2. The number of rivets inserted should not be more than 30% of the number of mounting bolts, and high-strength bolts should not be used as mounting bolts. The temporary connection is fixed to the platform layer by layer from bottom to top according to the lifting sequence. For details of the lifting sequence, see Figure 4 .

[0062] Fifth, permanent connection and fastening

[0063] After the entire span or the entire structural section is hoisted, the final inspection and correction of the corridor structure is carried out to ensure that the installation error of each component meets the requirements of the specification, and then each node is permanently connected and fixed.

[0064] The column foot plate and foundation anchor bolts are fastened with double nuts. The installation bolts of the platform longitudinal beam and column node plate are replaced with permanent high-strength bolts. The tightening sequence and initial and final tightening torques of the permanent high-strength bolt connection pair should meet the design requirements and comply with the provisions of the current industry standard "Technical Code for High-Strength Bolt Connections for Steel Structures" JGJ82. Finally, the upper and lower support components of the frame beam platform are welded and reinforced to complete the installation of the entire corridor structure.

[0065] Compared with the traditional pipe gallery construction method, the double-column longitudinal beam steel structure pipe gallery unit-type hoisting construction method has the following advantages:

[0066] 1. The assembled unit hoisting method is adopted for construction, which has high process conversion efficiency and fast construction speed.

[0067] 2. Reduce the frequency of lifting and reduce the cost of crane use.

[0068] 3. The assembly and welding of main components are completed on the ground assembly platform, which ensures the welding quality, reduces material waste and is environmentally friendly.

[0069] 4. Reduce the time of dangerous operations such as high-altitude welding and hoisting, and significantly reduce construction safety risks.

[0070] Using this construction method, the corridor structure is divided into assembly units for hoisting according to the design drawings, which streamlines the work process and improves the overall construction efficiency; each small component is assembled at one time on the ground construction platform, the assembly platform is simple to make, the work surface is flexible and mobile, the flow operation of each type of work is efficient, and the welding quality is guaranteed; instead of each work surface being routinely equipped with a crane and a aerial platform to cooperate with the construction, it is changed to a centralized hoisting operation to immediately complete the overall position, and the large and small steel components of each span are lifted independently instead of only 3 to 5 hoists per span, which greatly reduces the frequency of hoisting operations, reduces the applicable cost of cranes, reduces the high-altitude operation procedures and operation time, and reduces the safety risks of high-altitude operations.

[0071] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A unit-type hoisting construction method for a double-column longitudinal beam steel structure pipe gallery, characterized in that: include: According to the pipe gallery design structure drawing, the pipe gallery structure is divided into multiple hoisting units; An assembly platform is manufactured at the construction site to pre-assemble the components of the pipe gallery transported to the construction site to form the hoisting units; Hoisting each of the hoisting units, and temporarily connecting and fixing each of the hoisting units; After the hoisting of an independent section of the pipe gallery is completed, each hoisting unit is permanently connected and fixed.

2. The construction method according to claim 1, characterized in that: The assembly platform is arranged along the pipeline corridor line, and includes a horizontal tire frame unit formed by splicing steel frames.

3. The construction method according to claim 2, characterized in that: The assembly platform is formed by splicing a plurality of the horizontal tire frame units through bolts and connecting plates.

4. The construction method according to claim 3, characterized in that: When manufacturing the assembly platform, universal wheels are also arranged below the horizontal tire frame unit.

5. The construction method according to claim 1, characterized in that: Pre-assembling to form each of the hoisting units includes: Connect the left and right steel columns with the inter-column beam, diagonal brace and stiffening plate to form a double-column frame unit; The platform longitudinal beam is connected with the platform cross beam, the diagonal support and the stiffening plate to form a frame beam platform unit.

6. The construction method according to claim 5, characterized in that: The connection is welding or bolt connection followed by welding.

7. The construction method according to claim 5, characterized in that: Lifting each of the lifting units includes: First, use a truck crane to hoist the first and second span double-column frame units. Set at least two hoisting points during hoisting to ensure that the double columns are lifted vertically. After being corrected and put in place, use the double-column foot plates and pre-buried anchor bolts to temporarily fix them. Then hoist the lowest frame beam platform unit. Set four hoisting points during hoisting to ensure that the frame beam platform is hoisted horizontally. After correction and hoisting in place, temporarily connect and fix the platform longitudinal beam and the double column beam connecting plate with bolts. Afterwards, the upper frame beam platform is hoisted in sequence until the entire span unit structure is hoisted.

8. The construction method according to claim 7, characterized in that: Permanent connection and fixing of each lifting unit includes: The column base plate and foundation anchor bolts are fastened and fixed with double nuts; The installation bolts of the platform longitudinal beam and column node plate will be replaced with permanent high-strength bolts. The tightening sequence and initial and final tightening torques of the permanent high-strength bolt connection pair should meet the design requirements; The upper and lower supporting components of the frame beam platform were welded and reinforced to complete the installation of the corridor structure.

9. The construction method according to claim 1, characterized in that: Before pre-assembly, all components are fully measured and inspected, including specifications, dimensions, thickness, and surface rust.

10. The construction method according to claim 1, characterized in that: Before lifting each of the lifting units, all column base positions, elevations, axes, anchor bolt positions and extension lengths are inspected and accepted before construction can begin.

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