Truss-suspension structure upside-down accumulated hydraulic lifting construction method based on preassembled structure

Abstract

The invention belongs to the field of structure construction, and particularly discloses a truss-suspension structure upside-down accumulated hydraulic lifting construction method based on a preassembled structure, which comprises the following specific steps: S1, construction preparation; s2, the roof truss structure is assembled on the ground; s3, temporary measures of the lifting system are installed; s4, a lifting system is installed and debugged; s5, trying to lift by the first lifting unit; s6, the first lifting unit performs formal lifting; s7, a temporary support of the lifting unit is installed; s8, a suspension structure of the next layer of the truss is installed; s9, trying to lift by the second lifting unit; s10, the second lifting unit performs formal lifting; s11, mounting a secondary second-layer suspension structure of the truss; s12, trying to lift by a third lifting unit; s13, formally lifting by a third lifting unit; s14, the temporary facilities are dismantled after installation is completed; the special lifting steel strands are connected with the corresponding lower lifting points on the lifting steel structure, the lifting height and the lifting amplitude are not limited, supporting structures on the ground are reduced to the maximum extent, and the construction site is saved.

Description

Technical Field

[0001] The invention belongs to the field of structural construction, and in particular relates to a truss-suspension structure inversion method cumulative hydraulic lifting construction method based on a pre-installed structure. Background Art

[0002] With the rapid development of my country's economy and society and the significant enhancement of its comprehensive national strength, people's demands for building space are becoming more and more diversified and personalized, and the building structure forms are becoming more and more novel. As a new building structure form, the steel truss-suspension structure can give full play to the mechanical properties of high-strength steel because of its clear force transmission and the tension of the hanging column under vertical load, making the building look light. At the same time, it can realize a large span and open space layout, which can meet different functions and usage requirements. It is highly favored in public buildings such as office, commercial, cultural and sports education.

[0003] However, the construction sequence has a very obvious impact on the internal force of the suspension structure. An unreasonable construction sequence may cause the structure to produce large internal forces and deformation during the construction process. The traditional high-altitude in-situ assembly and installation method of the tire frame support will cause the suspension structure's hanging columns to be under pressure during the installation process. In addition, the high-altitude scattered assembly and support at different elevations is difficult, has high safety risks, requires a large amount of construction measures, has high costs, has low construction efficiency, and has a long construction period. Summary of the invention

[0004] The object of the present invention is to provide a truss-suspension structure inverted cumulative hydraulic lifting construction method based on a preassembled structure to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The truss-suspension structure inverted cumulative hydraulic lifting construction method based on the prefabricated structure has the following specific steps:

[0007] S1. Construction preparation: install the prefabricated structure in place and prepare the hydraulic lifting system;

[0008] S2. Ground assembly of roof truss structure: adopt the ground in-situ assembly method, first lay a stable assembly platform on the ground directly below the roof steel truss lifting unit, then install the lower chord, transverse connecting rod, vertical web, upper chord and connecting web in sequence, and perform inspection after the overall assembly and correction is completed;

[0009] S3. Installation of temporary measures for the lifting system: install the lifting platform, temporary lifting equipment for the lower lifting point, reinforcement rods for the lower lifting point and guide frame in sequence;

[0010] S4. Installation and commissioning of lifting system: install steel strands, hydraulic lifters and special bottom anchors in sequence, connect hydraulic pipelines with control and power lines, and then commission the lifting system;

[0011] S5. Trial lifting of the first lifting unit: loading the first lifting unit step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, 100% of the design load until the lifting unit is separated from the assembly frame;

[0012] S6, the first lifting unit is officially lifted: the lifting unit is lifted to a predetermined height and then the lifting is suspended. The predetermined lifting height is preferably suitable for the ground installation of the second-layer suspension structure of the roof truss;

[0013] S7, installing temporary support for the lifting unit: after each lifting unit is lifted to a predetermined height, a temporary steel support is installed below it, and the temporary steel support is installed at the main node of the lower chord of the first lifting unit truss;

[0014] S8, installation of the second-layer suspension structure of the truss;

[0015] S9, trial lifting of the second lifting unit: the roof truss and the suspension structure under it are used as the second lifting unit, and the loads are applied step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the total mass of the second lifting unit until the lifting unit is separated from the assembly frame;

[0016] S10, the second lifting unit is officially lifted: the second lifting unit is lifted to a predetermined height and then the lifting is suspended, and the temporary steel support position at the bottom of the lifting unit is adjusted so that it is supported at the main node of the chord at the bottom of the second lifting unit;

[0017] S11. Installation of the truss secondary second-layer suspension structure: Assemble the truss secondary second-layer suspension structure to make it integral with the upper steel structure;

[0018] S12, trial lifting of the third lifting unit: the roof truss and the second-layer suspension structure hanging thereunder are used as the third lifting unit, and are loaded step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the total mass of the third lifting unit until the lifting unit is separated from the assembly frame;

[0019] S13, the third lifting unit is officially lifted: the lifting of the third lifting unit is suspended when it is lifted to about 800mm from the design elevation;

[0020] S14. After installation, temporary facilities are removed: hydraulic lifting system equipment and temporary lifting measures structure are removed, and the hydraulic lifting construction of the steel truss-suspension structure is completed.

[0021] Preferably, in step S1, the pre-installed structure and part of the truss structure connected to the pre-installed structure need to be installed in place in sections according to the in-depth designed structure.

[0022] Preferably, in the step S3, a hydraulic lifter is arranged on the lifting platform, and the hydraulic lifter is connected to a corresponding lower hanging point on the ground truss lifting unit through a special steel strand.

[0023] Preferably, the S4 step adopts the bottom-to-top threading method, inserting the steel strands from the bottom of the hydraulic lifter to the top and then inserting the lower end of the steel strand bundle into the corresponding bottom anchor structure of the lower hanging point directly below, and locking it after adjustment. Each hydraulic lifter corresponds to a set of special bottom anchor structures, and the bottom anchor structure is installed inside the temporary lifting equipment of the lower hanging point. Each set of bottom anchors should be vertically corresponding and concentrically installed with the openings of the hydraulic lifter and the lifting point structure directly above it.

[0024] Preferably, in the step S5, when the graded loading is to the lifting unit and is about to leave the tire frame, it is possible that different points leave the ground at different times. At this time, the lifting speed should be reduced, and the ground clearance of each point should be closely observed. If necessary, "single-point lifting" should be performed.

[0025] Preferably, in the step S6, before the formal lifting, a level is used to detect the distance from the ground of each lifting point, the relative height difference of each lifting point is calculated, and the height of each lifting point is adjusted to make each lifting unit reach the designed posture. The adjusted height of each lifting point is used as the new starting position, and the displacement sensor is reset. During the overall lifting process, the posture is maintained until it is lifted to near the predetermined elevation. Before the adjustment begins, the computer synchronous control system is switched from automatic mode to manual mode.

[0026] Preferably, in the steps S5, S9 and S12, all temporary measures of the steel structure lifting unit and the hydraulic synchronous lifting system are checked again before the trial lifting to see whether they meet the design requirements. After confirmation, the trial lifting is started, and the lifting is suspended after the lifting unit is lifted by about 100 mm. The elevation of each lifting point of the lifting unit is fine-tuned to make the lifting unit in the design posture, and the lifting unit is left to stand for 2 to 24 hours.

[0027] Preferably, in the steps S6, S10 and S13, the steel structure lifting unit and the temporary measures for hydraulic synchronous lifting are checked again before formal lifting to see if there are any abnormalities, and formal lifting is started after confirming that there are no abnormalities.

[0028] Preferably, in the step S13, after suspending the lifting, the actual elevation of each lifting point is measured, and compared with the design elevation, and a record is made as a basis for continuing to lift the height, then the lifting speed is reduced according to the comparison result, and the "fine-tuning, inching" function of the hydraulic synchronous lifting computer control system is used to make each lifting point reach the design position and then temporarily lift, complete the welding work at the roof layer truss segment, connect the pre-installed structure and the top truss of the lifting unit into a whole, and then remove the temporary steel support on the ground of the lifting unit to facilitate the installation of the subsequent rods.

[0029] Preferably, in the step S14, the hydraulic lifting system equipment and the lifting temporary measures structure are removed before the installation structure and the rods are installed, so that the entire steel truss-suspension structure forms an overall stable force system, and then the hydraulic synchronous lifting system is unloaded in stages in the order of 95%, 90%, 80%, 70%, 60%, 50%, 40%, and 20% of the total mass of the truss-suspension structure until the steel strands are completely relaxed and the lifting unit load is completely transferred to the pre-installed structure support.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention adopts the inverted construction method, and the high-altitude operations such as assembly and welding of the roof steel truss and the suspension structure under it are adjusted to the ground for implementation, which minimizes the amount of high-altitude assembly and welding operations, can reduce labor intensity and safety risks, improve construction efficiency and welding quality, shorten the construction period, reduce construction costs, reduce interference with the construction site, reduce the performance parameter requirements of the lifting equipment during the assembly of the truss-suspension structure, solves the problem that large lifting equipment cannot be used in a narrow site, and at the same time reduces the construction machinery usage fee and reduces the construction cost.

[0032] The present invention adopts the inverted lifting construction technology and the multi-layer truss-suspension structure lifting-installation cycle operation to achieve low-position installation of high-altitude steel components, simplify the tire frame structure, reduce the difficulty of installing complex steel structures, and achieve fast and accurate construction.

[0033] The present invention connects the special lifting steel strands with the corresponding lower hanging points on the lifting steel structure, so the lifting height and lifting range are not restricted. The main temporary structures such as the lifting platform, temporary slings at the lower hanging points, reinforcement rods and guide frames are set up using pre-assembled structures, and the hydraulic synchronous lifting dynamic load is extremely small. Compared with the traditional high-altitude in-situ assembly and installation method of the tire frame support, the supporting structure on the ground can be minimized, thereby improving the space utilization efficiency, saving construction site and reducing the cost of measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0035] Figure 1 It is a flowchart of the method steps of the present invention;

[0036] Figure 2 It is a schematic diagram of the elevation structure of the lifting platform of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the lower suspension point reinforcement rod of the present invention;

[0038] Figure 4 It is a schematic diagram of the guide frame structure of the present invention;

[0039] Figure 5 This is a schematic diagram of a trial lift of the first lifting unit of the present invention;

[0040] Figure 6 This is a vertical rendering of the steel support installation platform below the lifting unit of the present invention;

[0041] Figure 7 This is a schematic diagram of a trial lift of the second lifting unit of the present invention;

[0042] Figure 8 This is a schematic diagram of a trial lift of the third lifting unit of the present invention;

[0043] Fig. 9 This is a schematic diagram of the steel truss-suspension structure of the present invention after installation. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0047] As attached Figure 1 To Attachment Fig. 9 As shown:

[0048] Embodiment 1: This embodiment provides a truss-suspension structure inverted cumulative hydraulic lifting construction method based on a pre-assembled structure, and the specific steps are as follows:

[0049] S1. Construction preparation: Install the pre-installed structure in place and prepare the hydraulic lifting system. First, according to the on-site structural layout and the calculation results of the fulcrum reaction force, the total lifting capacity of the hydraulic lifter should be greater than the total mass of the lifting unit. The rated lifting capacity of the XY-TS-315 hydraulic lifter is 315t. Then, according to the number of lifting points and hydraulic lifters, configure the corresponding number of XY-BY-30 hydraulic pump source systems and XY-KZ-01 computer synchronous control and sensor detection systems. The hydraulic pump source system should be arranged on the floor near the lifting point. At the same time, the corresponding power distribution box needs to be provided within 5m of each hydraulic pump source system. Finally, according to the standard value of the reaction force of each lifting point, the breaking force of a single steel strand, and the safety factor of the steel strand, the number of steel strands configured for a single hydraulic lifter is calculated. The steel strand is selected as prestressed steel strand with a specification of φ17.8, the breaking force of a single steel strand is 360kN, and the safety factor of the steel strand should be greater than 2;

[0050] S2. Ground assembly of roof truss structure: adopt the ground in-situ assembly method. First, lay a stable assembly platform on the ground directly below the roof steel truss lifting unit. The assembly platform is paved with H-shaped steel and leveled with steel gaskets. Then measure and lay the tire frame positioning line, set up the truss assembly tire frame, set up a 20mm knife plate on the top steel beam of the tire frame to adjust the pre-camber of the truss chord. The layout position of the tire frame should be adjusted according to the segmented size of the chord. Then install the lower chord, transverse connecting rod, vertical web, upper The chord and connecting web are inspected after the overall assembly and correction are completed. The lower chord of the truss is positioned and installed in sequence according to the assembly site sample line. After the positioning and welding of the lower chord is completed, the transverse connecting rod between the chords is installed. When installing the straight web, it is necessary to adjust to ensure the verticality of the web. Focus on checking that the upper chord elevation and the end interface position meet the requirements. The upper chord member is positioned and installed and welded and corrected to meet the requirements. The oblique web between the upper and lower chords is installed. After the overall assembly and correction are completed, the overall size is checked to meet the requirements. After the flaw detection is qualified, enter the next process;

[0051] S3. Installation of temporary measures for the lifting system: install the lifting platform, temporary slings at the lower lifting points, reinforcement rods and guide frames at the lower lifting points in sequence. The main temporary structures such as the lifting platform, temporary slings at the lower lifting points, reinforcement rods and guide frames are set up using pre-installed structures, and the dynamic load of hydraulic synchronous lifting is extremely small, which can minimize the support structure on the ground, thereby improving space utilization efficiency, saving construction space, and reducing measures. The lifting platform is composed of platform beams, diagonal braces, columns, tie rods and horizontal structures. The material is Q355B. The welds between the main load-bearing rods are full penetration welds with a weld grade of Level 2. The thickness of all stiffening plates is 20mm, and the stiffening plates and The horizontal structure is welded with fillet welds, and the weld size hf = 0.7t. According to the requirements of the structural layout and lifting process, the lower hanging point adopts the form of a temporary sling. The special steel strand is connected between the hydraulic lifter and the lifting bottom anchor, and the two ends are anchored separately to directly transmit the vertical lifting reaction force. The material of the lower hanging point reinforcement rod is Q355B, the specification is H300×300×10×15, the thickness of the stiffening plate is 20mm, and the stiffening plate adopts double-sided fillet welds, and the weld size hf = 0.7t. Each hydraulic lifter is equipped with a guide frame in advance to facilitate the smooth export of the top steel strand. The excess steel strand can be freely guided backward and downward along the lifting platform;

[0052] S4. Installation and commissioning of the lifting system: install the steel strands, hydraulic lifters and special bottom anchors in sequence, connect the hydraulic pipelines with the control and power lines, and then commission the lifting system. After the hydraulic lifter is installed in place, it is immediately fixed with a temporary pressure plate. Each hydraulic lifter uses four temporary pressure plates. The temporary pressure plates are set in an L shape. The inner side of the temporary pressure plate must be flat and can clamp the base of the lifter. The bottom of the temporary pressure plate is welded and fixed to the lower lifting platform beam. The welding adopts double-sided fillet welds. The base of the lifter must not be touched during welding. The weld height is not less than 10mm. The oil pipe of the hydraulic pump source system and the hydraulic lifter is connected. The connection of the control and power lines mainly includes the connection of various sensors, the control signal line between the hydraulic pump source system and the hydraulic lifter, the connection between the hydraulic pump source system and the computer synchronous control system, the power line between the hydraulic pump source system and the distribution box, and the power line of the computer control system.

[0053] S5. Trial lifting of the first lifting unit: Load the first lifting unit step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the design load until the lifting unit is separated from the assembly frame. During the graded loading process, each step of graded loading should be paused and the deformation of the upper and lower hanging point structures, the lifting unit, etc. before and after loading, as well as the stability of the main structure, etc. should be checked;

[0054] S6, the first lifting unit is officially lifted: the lifting unit is lifted to a predetermined height and then the lifting is suspended. The predetermined lifting height is preferably suitable for the ground installation of the second-layer suspension structure of the roof truss;

[0055] S7, installing temporary support for the lifting unit: after each lifting unit is lifted to a predetermined height, a temporary steel support is installed below it, and the temporary steel support is installed at the main node of the lower chord of the first lifting unit truss;

[0056] S8, installation of the second-layer suspension structure of the truss;

[0057] S9, trial lifting of the second lifting unit: the roof truss and the suspension structure under it are used as the second lifting unit, and the loads are applied step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the total mass of the second lifting unit until the lifting unit is separated from the assembly frame;

[0058] S10, the second lifting unit is officially lifted: the second lifting unit is lifted to a predetermined height and then the lifting is suspended, and the temporary steel support position at the bottom of the lifting unit is adjusted so that it is supported at the main node of the chord at the bottom of the second lifting unit;

[0059] S11. Installation of the truss second-layer suspension structure: Assemble the truss second-layer suspension structure to make it integral with the upper steel structure;

[0060] S12, trial lifting of the third lifting unit: the roof truss and the second-layer suspension structure hanging thereunder are used as the third lifting unit, and are loaded step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the total mass of the third lifting unit until the lifting unit is separated from the assembly frame;

[0061] S13, the third lifting unit is officially lifted: the lifting of the third lifting unit is suspended when it is lifted to about 800mm from the design elevation;

[0062] S14. After installation, temporary facilities are removed: hydraulic lifting system equipment and temporary lifting measures structure are removed, and the hydraulic lifting construction of the steel truss-suspension structure is completed.

[0063] Specifically, the pre-installed structure and part of the truss structure connected to the pre-installed structure in step S1 need to be installed in place in sections according to the in-depth design structure, so that a hydraulic lifting platform can be set on the top of the steel support later.

[0064] Specifically, in step S3, a hydraulic lifter is arranged on the lifting platform, and the hydraulic lifter is connected to a corresponding lower hanging point on the ground truss lifting unit through a special steel strand.

[0065] Specifically, in step S4, the steel strands are passed from the bottom to the top through the hydraulic lifter. The bottom of each bundle of steel strands is level, and the upper ends of the passed steel strands are fixed by clamps and anchor plates. The lower ends of the steel strand bundles are then passed through the corresponding bottom anchor structure of the lower hanging point directly below. After adjustment, they are locked. The steel strands reserved on the top of each hydraulic lifter should be guided in a predetermined direction along the guide frame. Each hydraulic lifter corresponds to a set of special bottom anchor structures, which are installed inside the temporary sling of the lower hanging point. Each set of bottom anchors should be vertically corresponding and concentrically installed with the openings of the hydraulic lifter and the lifting hanging point structure directly above it.

[0066] It can be seen from the above that the hydraulic lifting system is mainly composed of a hydraulic lifter, a hydraulic pump source system, a computer synchronous control and a sensor detection system. A hydraulic lifter is used as a lifting tool, and a flexible steel strand is used as a load-bearing rigging. The hydraulic lifting equipment and facilities are small in size, light in weight, large in lifting capacity, simple and convenient to install and disassemble, and are not restricted by the construction site. The wedge-shaped anchors at both ends of the hydraulic lifter have a one-way self-locking effect. When the anchor is working (tight), it will automatically lock the steel strand; when the anchor is not working (loose), the steel strand is released, and the steel strand can move up and down, and the components can be reliably locked at any position during the lifting process for a long time. Any lifter can also be adjusted separately with high adjustment accuracy. The controllability of the installation accuracy during the structure lifting process is high. The equipment itself has a hydraulic lock protection device, a sudden power failure protection device and a synchronous lifting deviation protection device. Once a system failure or an unexpected power failure occurs, the clamping device The hydraulic pump source system provides hydraulic power for the hydraulic lifter, completes the corresponding action under the control of various hydraulic valves, controls the running speed of the lifter by adjusting the flow of the hydraulic system, and keeps the various points of the lifted structural unit running synchronously. The pump source hydraulic system adopts a modular structure. Through the extended combination of lifting equipment, the lifting weight, span and area are not restricted. The hydraulic lifter is connected to the corresponding lower hanging point on the lifting steel structure through the lifting special steel strand, and the lifting height and lifting range are not restricted. When the hydraulic lifter repeats the action periodically, the lifted heavy object moves upward step by step. The hydraulic lifter controls the running speed of the lifter by adjusting the flow of the hydraulic system. The acceleration during the action is extremely small, and the additional dynamic load (vibration and impact) on the steel structure lifting unit and the pre-installed structure can be ignored.

[0067] First, use the hydraulic synchronous lifting system to lift the roof steel truss as a whole to a certain height and then pause the lifting. Secondly, assemble a suspension structure under the roof truss on the ground directly below its projection surface to connect it with the top truss as a whole. Use the hydraulic synchronous lifting system again to lift the lifting unit as a whole to a certain height and then pause the lifting. Then repeat the above steps until the entire truss-suspension structure is assembled. Use the hydraulic synchronous lifting system to lift the roof truss and its hanging structure as a whole to the designed installation elevation. Finally, connect the truss-suspension structure and the pre-installed structure as a whole, install subsequent rods, remove temporary measures, and complete the installation of the entire steel truss-suspension structure.

[0068] Embodiment 2: This embodiment is basically the same as the previous embodiment, except that in steps S5, S9 and S12, all temporary measures of the steel structure lifting unit and the hydraulic synchronous lifting system are checked again before trial lifting to see whether they meet the design requirements. After confirmation, trial lifting is started, and the lifting is suspended after the lifting unit is lifted by about 100 mm. The elevation of each lifting point of the lifting unit is fine-tuned to make the lifting unit in the design posture, and then left to stand for 2 to 24 hours.

[0069] Specifically, in steps S6, S10 and S13, the steel structure lifting unit and the temporary measures for hydraulic synchronous lifting are checked again before formal lifting to see if there are any abnormalities, and formal lifting begins after confirming that there are no abnormalities.

[0070] Specifically, in step S14, the hydraulic lifting system equipment and the lifting temporary measures structure are removed, and the front-installed structure and the rear-installed rods are installed to form an overall stable force system for the entire steel truss-suspension structure. Then, the hydraulic synchronous lifting system is unloaded in stages in the order of 95%, 90%, 80%, 70%, 60%, 50%, 40%, and 20% of the total mass of the truss-suspension structure until the steel strands are completely relaxed and the lifting unit load is completely transferred to the pre-installed structure support.

[0071] From the above, it can be seen that first, the upper trusses of the steel structure lifting unit are assembled into an integral lifting unit on the floor directly below its projection surface (excluding the rods connected to the supports), and then the lifting platform (upper hanging point) is set up using the pre-installed structure. Each set of lifting platforms is arranged with an XY-TS-315 hydraulic lifter, and then temporary lifting equipment and reinforcement rods for the lower hanging point are installed at the position corresponding to the upper chord and upper hanging point of the steel structure lifting unit. Then, the upper and lower hanging points are connected by special bottom anchors and steel strands, and finally the lifting unit is lifted as a whole using a hydraulic synchronous lifting system.

[0072] Embodiment 3: This embodiment is basically the same as the previous embodiment, except that, in step S5, when the lifting unit is loaded in stages and is about to leave the tire frame, it is possible that different points leave the ground at different times. At this time, the lifting speed should be reduced, and the ground clearance of each point should be closely observed. If necessary, "single-point movement" lifting should be performed to ensure that the lifting unit leaves the ground smoothly.

[0073] Specifically, in step S6, before the formal lifting, a level is used to detect the distance from the ground of each lifting point, the relative height difference of each lifting point is calculated, and the height of each lifting point is adjusted to make each lifting unit reach the designed posture. The adjusted height of each lifting point is used as the new starting position, and the displacement sensor is reset. During the overall lifting process, this posture is maintained until it is lifted to near the predetermined elevation. Before the adjustment begins, the computer synchronous control system is switched from automatic mode to manual mode.

[0074] Specifically, in step S13, after suspending the lifting, the actual elevation of each lifting point is measured and compared with the design elevation, and a record is made as a basis for continuing to lift the height. Then, the lifting speed is reduced according to the comparison result, and the "fine-tuning, inching" function of the hydraulic synchronous lifting computer control system is used to make each lifting point reach the design position and then temporarily lift, complete the welding work at the roof layer truss segment, connect the pre-installed structure and the top truss of the lifting unit into a whole, and then remove the temporary steel support on the ground of the lifting unit to facilitate the installation of the subsequent rods.

[0075] As can be seen from the above, by using stroke and displacement sensor monitoring and computer control, through data feedback and control command transmission, the operator can observe the hydraulic lifting process and related data and issue control commands through the hydraulic synchronous computer control system human-machine interface. The hydraulic synchronous lifting controls the synchronization of each lifting point through computer control. During the lifting process, the components maintain a stable lifting posture, and the synchronous control accuracy is high. The hydraulic lifting system has a millimeter-level fine-tuning function, which can achieve precise vertical positioning in the air. It adopts a centralized control system, which is simple to operate and has a high level of automation. The hydraulic cylinder has multiple groups of synchronization and single group adjustment functions, and the units can be combined arbitrarily. At the same time, the multi-point synchronous lifting has small deviation and small impact, and the operation is stable during the lifting process, with good safety, high reliability and strong versatility.

[0076] Furthermore, this design application is applied to the structural construction of a truss-suspension structure based on a preinstalled structure. First, the roof layer steel truss is lifted as a whole to a certain height by a hydraulic synchronous lifting system and then the lifting is suspended. Secondly, a suspension structure below the roof layer truss is assembled on the ground directly below its projection surface to connect it with the top truss as a whole. Again, the hydraulic synchronous lifting system is used to lift the lifting unit as a whole to a certain height and then the lifting is suspended. Then, the above steps are repeated until the entire truss-suspension structure is assembled. Then, the roof layer truss and its hanging structure are lifted as a whole to the designed installation elevation by a hydraulic synchronous lifting system. Finally, the truss-suspension structure is connected to the preinstalled structure as a whole, and subsequent rods are installed, temporary measures are removed, and the installation of the entire steel truss-suspension structure is completed; the purpose is to avoid large internal forces and deformations during the construction process, reduce safety risks, and improve work efficiency.

[0077] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0078] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0079] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0080] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A truss-suspension structure inverted cumulative hydraulic lifting construction method based on a prefabricated structure, characterized in that: The specific steps are as follows: S1. Construction preparation: install the prefabricated structure in place and prepare the hydraulic lifting system; S2. Ground assembly of roof truss structure: adopt the ground in-situ assembly method, first lay a stable assembly platform on the ground directly below the roof steel truss lifting unit, then install the lower chord, transverse connecting rod, vertical web, upper chord and connecting web in sequence, and perform inspection after the overall assembly and correction is completed; S3. Installation of temporary measures for the lifting system: install the lifting platform, temporary lifting equipment for the lower lifting point, reinforcement rods for the lower lifting point and guide frame in sequence; S4. Installation and commissioning of lifting system: install steel strands, hydraulic lifters and special bottom anchors in sequence, connect hydraulic pipelines with control and power lines, and then commission the lifting system; S5. Trial lifting of the first lifting unit: loading the first lifting unit step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, 100% of the design load until the lifting unit is separated from the assembly frame; S6, the first lifting unit is officially lifted: the lifting unit is lifted to a predetermined height and then the lifting is suspended. The predetermined lifting height is preferably suitable for the ground installation of the second-layer suspension structure of the roof truss; S7, installing temporary support for the lifting unit: after each lifting unit is lifted to a predetermined height, a temporary steel support is installed below it, and the temporary steel support is installed at the main node of the lower chord of the first lifting unit truss; S8, installation of the second-layer suspension structure of the truss; S9, trial lifting of the second lifting unit: the roof truss and the suspension structure under it are used as the second lifting unit, and the loads are applied step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the total mass of the second lifting unit until the lifting unit is separated from the assembly frame; S10, the second lifting unit is officially lifted: the second lifting unit is lifted to a predetermined height and then the lifting is suspended, and the temporary steel support position at the bottom of the lifting unit is adjusted so that it is supported at the main node of the chord at the bottom of the second lifting unit; S11. Installation of the truss secondary second-layer suspension structure: Assemble the truss secondary second-layer suspension structure to make it integral with the upper steel structure; S12, trial lifting of the third lifting unit: the roof truss and the second-layer suspension structure hanging thereunder are used as the third lifting unit, and are loaded step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100% of the total mass of the third lifting unit until the lifting unit is separated from the assembly frame; S13, the third lifting unit is officially lifted: the lifting of the third lifting unit is suspended when it is lifted to about 800mm from the design elevation; S14. After installation, temporary facilities are removed: hydraulic lifting system equipment and temporary lifting measures structure are removed, and the hydraulic lifting construction of the steel truss-suspension structure is completed.

2. The cumulative hydraulic lifting construction method of the truss-suspension structure inverted installation method based on the prefabricated structure according to claim 1 is characterized by: In the step S1, the pre-installed structure and part of the truss structure connected to the pre-installed structure need to be installed in place in sections according to the in-depth design of the structure.

3. The cumulative hydraulic lifting construction method of the truss-suspension structure inverted installation method based on the prefabricated structure according to claim 2 is characterized by: In the step S3, a hydraulic lifter is arranged on the lifting platform, and the hydraulic lifter is connected to the corresponding lower suspension point on the ground truss lifting unit through a special steel strand.

4. The cumulative hydraulic lifting construction method of the truss-suspension structure inverted installation method based on the prefabricated structure according to claim 3 is characterized by: In the step S4, the steel strand is passed from the bottom to the top through the hydraulic lifter, and then the lower end of the steel strand bundle is passed into the corresponding bottom anchor structure of the lower hanging point directly below. After adjustment, it is locked. Each hydraulic lifter corresponds to a set of special bottom anchor structures, and the bottom anchor structure is installed inside the temporary sling of the lower hanging point. Each set of bottom anchors should be vertically corresponding and concentrically installed with the openings of the hydraulic lifter and the lifting point structure directly above it.

5. The cumulative hydraulic lifting construction method of the truss-suspension structure inverted installation method based on the prefabricated structure according to claim 4 is characterized by: In the step S5, when the graded loading is completed and the lifting unit is about to leave the tire frame, it is possible that different points leave the ground at different times. At this time, the lifting speed should be reduced, and the lifting conditions of each point should be closely observed. If necessary, "single-point lifting" should be performed.

6. The cumulative hydraulic lifting construction method of the truss-suspension structure inverted installation method based on the prefabricated structure according to claim 5 is characterized by: In the step S6, before the formal lifting, a level is used to detect the distance from the ground of each lifting point, calculate the relative height difference of each lifting point, adjust the height of each lifting point, so that each lifting unit reaches the designed posture, take the adjusted height of each lifting point as the new starting position, reset the displacement sensor, and maintain this posture during the overall lifting process until it is lifted to near the predetermined elevation. Before the adjustment begins, the computer synchronous control system is switched from automatic mode to manual mode.

7. The cumulative hydraulic lifting construction method of the truss-suspension structure inverted installation method based on the prefabricated structure according to claim 6 is characterized by: In the steps S5, S9 and S12, all temporary measures of the steel structure lifting unit and the hydraulic synchronous lifting system are checked again before the trial lifting to see if they meet the design requirements. After confirmation, the trial lifting is started, and the lifting is suspended after the lifting unit is lifted by about 100 mm. The elevation of each lifting point of the lifting unit is fine-tuned to make the lifting unit in the design posture, and then left to stand for 2 to 24 hours.

8. The cumulative hydraulic lifting construction method of the truss-suspension structure inverted installation method based on the prefabricated structure according to claim 7 is characterized by: In the steps S6, S10 and S13, the steel structure lifting unit and the temporary measures for hydraulic synchronous lifting are checked again before the formal lifting to see if there are any abnormalities, and the formal lifting is started after confirming that there are no abnormalities.

9. The cumulative hydraulic lifting construction method of the truss-suspension structure inverted installation method based on the prefabricated structure according to claim 8 is characterized by: In the step S13, after pausing the lifting, the actual elevation of each lifting point is measured and compared with the design elevation, and a record is made as a basis for continuing to lift the height. Then, the lifting speed is reduced according to the comparison result, and the "fine-tuning, inching" function of the hydraulic synchronous lifting computer control system is used to make each lifting point reach the design position and then temporarily lift, complete the welding work at the roof layer truss segment, connect the pre-installed structure and the top truss of the lifting unit into a whole, and then remove the temporary steel support on the ground of the lifting unit to facilitate the installation of the post-installed rods.

10. The cumulative hydraulic lifting construction method of the truss-suspension structure inverted installation method based on the prefabricated structure according to claim 9 is characterized in that: In the step S14, the hydraulic lifting system equipment and the lifting temporary measures structure are removed, and the front installation structure and the rear installation rods are installed, so that the entire steel truss-suspension structure forms an overall stable force system, and then the hydraulic synchronous lifting system is unloaded in stages in the order of 95%, 90%, 80%, 70%, 60%, 50%, 40%, and 20% of the total mass of the truss-suspension structure until the steel strands are completely relaxed and the lifting unit load is completely transferred to the pre-installed structure support.

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