Hydraulic hoisting construction method by inverted method of truss-suspension structure based on pre-installed structure

Abstract

The present application belongs to the field of structure construction, and discloses a truss-suspension structure reverse installation method based on pre-installed structure, which comprises the following steps: S1, construction preparation; S2, ground assembly of roof truss structure; S3, installation of temporary measures of lifting system; S4, installation and debugging of lifting system; S5, trial lifting of first lifting unit; S6, formal lifting of first lifting unit; S7, installation of temporary support of lifting unit; S8, installation of truss next layer suspension structure; S9, trial lifting of second lifting unit; S10, formal lifting of second lifting unit; S11, installation of truss second layer suspension structure; S12, trial lifting of third lifting unit; S13, formal lifting of third lifting unit; and S14, removal of temporary facilities after installation is completed. The present application is connected with corresponding lower hanging points on the lifting steel structure through special lifting steel strands, and the lifting height and lifting range are not limited, so that the support structure on the ground is reduced to the maximum extent, and the construction site is saved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of structural construction, and particularly relates to a truss-suspension structure reverse installation method cumulative hydraulic lifting construction method based on pre-installed structures. BACKGROUND

[0002] With the rapid development of China's economy and society and the significant increase in comprehensive national strength, people's demand for architectural space is becoming more and more diversified and personalized, and the architectural structural form is becoming more and more novel. As a new architectural structural form, the steel truss-suspension structure is favored in office buildings, commercial buildings, cultural and educational buildings, etc. due to its clear force transmission, tensile column under vertical load, full play of the mechanical properties of high-strength steel, light building, large-span and open space layout, and the ability to meet different functional and use requirements.

[0003] However, the construction sequence has a significant impact on the internal force of the suspension structure, and an unreasonable construction sequence may cause large internal force and deformation of the structure during construction. The traditional cradle support high-altitude in-situ assembly installation method may cause the suspension structure column to bear pressure during installation, and different elevation high-altitude scattered assembly and scattered support are difficult, high in safety risk, large in construction measure engineering quantity, high in measure cost, low in construction efficiency, and long in construction period. SUMMARY

[0004] The present application aims to provide a truss-suspension structure reverse installation method cumulative hydraulic lifting construction method based on pre-installed structures to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The truss-suspension structure reverse installation method cumulative hydraulic lifting construction method based on pre-installed structures has the following specific steps:

[0007] S1, construction preparation: install the pre-installed structure in place and prepare the hydraulic lifting system;

[0008] S2, roof truss structure ground assembly: using 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, horizontal link, vertical web, upper chord and connecting web in sequence, and detect after the overall assembly correction is completed;

[0009] S3, installation of temporary measures of lifting system: install the lifting platform, lower lifting point temporary lifting device, lower lifting point reinforcing rod and guide frame in sequence;

[0010] S4, installation and debugging of lifting system: install the steel strand, hydraulic lifter and special bottom anchor in sequence, connect the hydraulic pipeline and control, power line, and then debug the lifting system;

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

[0012] S6, first lifting unit formal lifting: after lifting the lifting unit to the predetermined height, stop lifting, and the predetermined lifting height is suitable for the ground installation of the next layer of suspended structure of the roof truss;

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

[0014] S8, installation of the next layer of suspended structure of the truss;

[0015] S9, second lifting unit test lifting: taking the roof layer truss and the suspended structure hung below it as the second lifting unit, in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, 100% of the total mass of the second lifting unit, step by step loading until the lifting unit is separated from the assembled jig frame;

[0016] S10, second lifting unit formal lifting: after lifting the second lifting unit to the predetermined height, stop lifting, and adjust the position of the temporary steel support at the bottom of the second lifting unit to support at the bottom chord main node;

[0017] S11, installation of the second layer of suspended structure of the truss: assemble the second layer of suspended structure of the truss to make it an integral whole with the upper steel structure;

[0018] S12, third lifting unit test lifting: taking the roof layer truss and the suspended structure hung below it as the third lifting unit, in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95%, 100% of the total mass of the third lifting unit, step by step loading until the lifting unit is separated from the assembled jig frame;

[0019] S13, third lifting unit formal lifting: stop lifting when the third lifting unit is lifted to about 800mm from the design elevation;

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

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

[0022] Preferably, the S3 step is to set hydraulic jacks on the lifting platform, which are connected to the corresponding lower lifting points on the ground truss lifting unit through special steel strands.

[0023] Preferably, the S4 step is to pass the steel strands from the bottom to the top of the hydraulic jacks, and then pass the lower end of the steel strand bundle into the corresponding lower lifting point bottom anchor structure, and lock after adjustment. Each hydraulic jack corresponds to a set of special bottom anchor structure, which is installed inside the temporary lifting device of the lower lifting point, and each set of bottom anchor is vertically corresponding and concentrically installed with the hydraulic jack and the lifting point structure opening hole above it.

[0024] Preferably, the S5 step is to reduce the lifting speed and closely observe the off-ground condition of each point when the lifting unit is about to leave the jig, and to do "single-point dynamic" lifting if necessary.

[0025] Preferably, the S6 step is to detect the off-ground distance of each lifting point with a level before formal lifting, calculate the relative height difference of each lifting point, adjust the height of each lifting point, and make each lifting unit reach the designed posture. The height of each lifting point after adjustment is the new starting position, and the displacement sensor is reset. During the overall lifting process, the posture is maintained until the lifting unit reaches the vicinity of the predetermined elevation. The computer synchronous control system is switched from automatic mode to manual mode before the adjustment starts.

[0026] Preferably, the S5, S9 and S12 steps are to check again whether all temporary measures of the steel structure lifting unit and the hydraulic synchronous lifting system meet the design requirements before trial lifting, and to start trial lifting after confirming that there is no error. The lifting unit is paused after lifting about 100 mm, and the height of each lifting point of the lifting unit is fine-tuned so that the lifting unit is in the designed posture and is stationary for 2-24 hours.

[0027] Preferably, the S6, S10 and S13 steps are to check again whether there are any abnormalities in the steel structure lifting unit and the hydraulic synchronous lifting temporary measures before formal lifting, and to start formal lifting after confirming that there are no abnormalities.

[0028] Preferably, the S13 step is to measure the actual height of each lifting point after pausing the lifting, compare it with the designed height, and make a record as the basis for the required height of continuous lifting. Then, according to the comparison result, the lifting speed is reduced, and the "fine-tuning and point-by-point" function of the hydraulic synchronous lifting computer control system is used to make each lifting point reach the designed position, and then the roof layer truss is welded to make the pre-installed structure and the top truss of the lifting unit into a whole, and then the ground temporary steel support of the lifting unit is removed for the installation of the rear-mounted rod.

[0029] Preferably, the S14 step is installed after the structure is removed before the hydraulic lifting system device and the temporary lifting structure is installed, so that the whole steel truss-suspension structure forms a whole stable force system, and then the hydraulic synchronous lifting system is sequentially unloaded in stages according to 95%, 90%, 80%, 70%, 60%, 50%, 40%, 20% of the total mass of the truss-suspension structure, until the steel strand is completely relaxed, and the lifting unit load is completely transferred to the pre-installed structure support.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] The present application is constructed by the inverted method, and the high-altitude operations such as assembly and welding of the roof steel truss and the suspended structure hung below are all adjusted to be implemented on the ground, thereby minimizing the high-altitude assembly and welding work quantity, reducing labor intensity and safety risk, improving construction efficiency and welding quality, shortening construction period, reducing construction cost, reducing interference to the construction site, reducing the performance parameter requirements of the hoisting equipment during the assembly process of the truss-suspension structure, solving the problem that large hoisting equipment cannot be deployed for work in a narrow site, and reducing construction machinery usage fee and construction cost.

[0032] The present application realizes low-position installation of high-altitude steel members through the inverted lifting construction technology and the lifting-installation circulation operation of the multi-layer truss-suspension structure, simplifies the jig structure, reduces the installation difficulty of complex steel structures, and realizes rapid and accurate construction.

[0033] The present application connects the lifting special steel strand with the corresponding lower lifting point on the lifting steel structure, and the lifting height and lifting amplitude are not limited, the main temporary structures such as the lifting platform, the temporary lifting device of the lower lifting point, the reinforcing rod and the guide frame are set by the pre-installed structure, and the hydraulic synchronous lifting dynamic load is extremely small, compared with the traditional jig support high-altitude in-situ assembly and installation method, the support structure on the ground can be minimized, thereby improving the space utilization efficiency, saving the construction site, and reducing the measure cost. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0035] Figure 1 It is a method step flow chart of the present application;

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

[0037] Figure 3 Fig. 1 is a schematic diagram of the reinforcing rod structure of the lower hanging point of the present application;

[0038] Figure 4 Fig. 2 is a schematic diagram of the guide frame structure of the present application;

[0039] Figure 5 Fig. 3 is a schematic diagram of the first lifting unit test lifting of the present application;

[0040] Figure 6 Fig. 4 is a perspective view of the steel support installation platform below the lifting unit of the present application;

[0041] Figure 7 Fig. 5 is a schematic diagram of the second lifting unit test lifting of the present application;

[0042] Figure 8 Fig. 6 is a schematic diagram of the third lifting unit test lifting of the present application;

[0043] Figure 9 Fig. 7 is a schematic diagram of the steel truss-suspension structure installation of the present application. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0045] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0046] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. In this specification, "in one embodiment" does not mean the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0047] As shown in the accompanying drawings Figure 1 to the accompanying drawings Figure 9 as shown:

[0048] Embodiment one: the present embodiment provides a truss-suspension structure inversion method cumulative hydraulic lifting construction method based on pre-installed structure, 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 structure arrangement and the fulcrum reaction force calculation results, the total lifting capacity of the hydraulic lifter should be greater than the total mass of the lifting unit, and the rated lifting capacity of the XY-TS-315 type hydraulic lifter is 315t. Then, according to the lifting points and the number of hydraulic lifters, configure the corresponding number of XY-BY-30 type hydraulic pump source systems, XY-KZ-01 type computer synchronous control and sensing detection systems. The hydraulic pump source system should be arranged on the floor near the lifting point, and the corresponding power distribution box needs to be provided to each hydraulic pump source system within 5m range. Finally, according to the standard value of each lifting point reaction force, the breaking force of single steel strand and the safety factor of steel strand, the number of steel strands of single hydraulic lifter is calculated. The steel strand selected is φ17.8 prestressed steel strand, the breaking force of single steel strand is 360kN, and the safety factor of steel strand should be greater than 2;

[0050] S2, ground assembly of roof truss structure: using 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 laid with H-shaped steel, leveled with steel shims, then measure and place the jig positioning line, erect the truss assembly jig, set 20mm knife plates on the top steel beam of the jig to adjust the truss chord pre-camber, the arrangement position of the jig should be adjusted according to the sectional size of the chord, then install the lower chord, horizontal link, vertical web, upper chord and connecting web in turn, and after the overall assembly correction is completed, detect, according to the assembly ground sample line, install the truss lower chord in turn, after the lower chord positioning and welding is completed, supplement the chord interlink, when installing the straight web, adjust to ensure the perpendicularity of the web, check the upper chord elevation and end interface position to meet the requirements, position and install the upper chord and weld to correct, supplement the inclined web between upper and lower chords, after the overall assembly correction is completed, check the overall size to meet the requirements, and after the flaw detection is qualified, enter the next process;

[0051] S3, temporary installation of the lifting system: install the lifting platform, the temporary lifting device of the lower lifting point, the reinforcing rod of the lower lifting point and the guide frame in sequence. The main temporary structures such as the lifting platform, the temporary lifting device of the lower lifting point, the reinforcing rod and the guide frame are provided by using the pre-installed structure, and the hydraulic synchronous lifting dynamic load is very small, which can minimize the support structure on the ground, thereby improving the space utilization efficiency, saving the construction site, reducing the measure cost, and the lifting platform is composed of platform beams, inclined braces, columns, tie rods and horizontal structures, the material quality is Q355B, the welding seam between the main force rods is full penetration welding, the welding seam is grade two, the thickness of all stiffeners is 20 mm, the stiffeners and the horizontal structures are welded by fillet welding, the welding seam size is hf=0.7t, according to the requirements of the structure arrangement and the lifting process, the lower lifting point is in the form of a temporary lifting device, the special steel wire is connected between the hydraulic lift and the lifting bottom anchor, and the two ends are anchored respectively for directly transmitting the vertical lifting reaction force, the reinforcing rod of the lower lifting point is made of Q355B, the specification is H300*300*10*15, the thickness of the stiffener is 20 mm, the stiffener is welded by double-sided fillet welding, the welding seam size is hf=0.7t, each hydraulic lift is provided with a guide frame in advance to facilitate the smooth guide of the top steel wire, and the excess steel wire can be freely guided backward and downward along the lifting platform;

[0052] S4, installation and debugging of the lifting system: install the steel wire, the hydraulic lift and the special bottom anchor in sequence, connect the hydraulic pipeline and the control and power lines, and then debug the lifting system. After the hydraulic lift is installed in place, it is immediately fixed by using temporary pressure plates. Four temporary pressure plates are used for each hydraulic lift. The temporary pressure plates are arranged in an L shape, the inner side of the temporary pressure plates needs to be flat, the temporary pressure plates can be clamped on the lift base, the bottom of the temporary pressure plates is welded and fixed with the lower lifting platform beam, the welding is welded by double-sided fillet welding, the lift base should not be contacted during welding, the welding seam height is not less than 10 mm, the oil pipe of the hydraulic pump source system is connected with the hydraulic lift, the connection of the control and power lines mainly includes the connection of various sensors, the connection of the control signal line between the hydraulic pump source system and the hydraulic lift, the connection between the hydraulic pump source system and the computer synchronous control system, the connection of the power line between the hydraulic pump source system and the distribution box, and the connection of the computer control system power line;

[0053] S5, test lifting of the first lifting unit: load in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the design load of the first lifting unit, until the lifting unit is separated from the assembled jig frame. During the step-by-step loading, each step of the step-by-step loading should be paused and checked for the deformation of the upper lifting point, the lower lifting point structure, the lifting unit and the like before and after loading, and the stability of the main structure and the like.

[0054] S6, the first lifting unit is formally lifted: the lifting unit is lifted to a predetermined height, and the lifting is paused, and the predetermined lifting height is suitable for the ground installation of the next layer of the suspended structure of the roof truss;

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

[0056] S8, installing the next layer of the suspended structure of the truss;

[0057] S9, the second lifting unit is tested and lifted: the roof layer truss and the next layer of the suspended structure hung below are taken as the second lifting unit, and the second lifting unit is loaded in an 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 assembled jig frame;

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

[0059] S11, installing the next layer of the suspended structure of the truss: the next layer of the suspended structure of the truss is assembled so as to be connected as a whole with the upper steel structure;

[0060] S12, the third lifting unit is tested and lifted: the roof layer truss and the next layer of the suspended structure hung below are taken as the third lifting unit, and the third lifting unit is loaded in an 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 assembled jig frame;

[0061] S13, the third lifting unit is formally lifted: the third lifting unit is lifted to a height of about 800 mm from the design elevation, and the lifting is paused;

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

[0063] Specifically, in the S1 step, the pre-installed structure and part of the truss structure connected with the pre-installed structure need to be installed in place according to the segmented structure of the deepening design, so as to set the hydraulic lifting platform on the top of the steel support later.

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

[0065] Specifically, in the S4 step, the steel strands are threaded from the bottom to the top of the hydraulic hoist, with the bottom of each bundle of steel strands being level, the upper end of the threaded steel strands being fixed by a clamp and an anchor, the lower end of the bundle of steel strands being threaded into the corresponding bottom anchor structure of the directly lower hanging point, being adjusted and locked, the steel strands reserved at the top of each hydraulic hoist being guided along the guide frame towards the predetermined direction, each hydraulic hoist corresponding to a set of special bottom anchor structure, the bottom anchor structure being installed inside the temporary hoist of the lower hanging point, each set of bottom anchor being vertically corresponding and concentrically installed with the hydraulic hoist and the hoist structure opening hole above it.

[0066] As can be seen from the above, the hydraulic lifting system mainly comprises a hydraulic hoist, a hydraulic pump source system, a computer synchronous control and sensing detection system, adopts the hydraulic hoist as the lifting machine, and the flexible steel strand as the bearing cable, has the advantages of small volume, light weight, large lifting capacity, simple and convenient installation and removal, no limitation of construction site, one-way self-locking of the wedge-shaped anchor at both ends of the hydraulic hoist, automatic locking of the steel strand when the anchor is working (tight), release of the steel strand when the anchor is not working (loose), up and down movement of the steel strand, long-term reliable locking of the component at any position in the lifting process, independent adjustment of any hoist, high adjustment precision, high controllability of the installation precision in the structure lifting process, hydraulic lock protection device, sudden power failure protection device and synchronous lifting deviation protection device of the equipment itself, locking of the bearing steel strand by the clamping device in case of system failure or accidental power failure, high safety and reliability, provision of hydraulic power for the hydraulic hoist by the hydraulic pump source system, completion of the corresponding action under the control of various hydraulic valves, control of the running speed of the hoist by adjusting the flow of the hydraulic system, synchronous operation of each point of the lifted structure unit, adoption of the modular structure of the pump source hydraulic system, lifting of the weight, span and area without limitation through the expansion combination of the lifting equipment, connection of the hydraulic hoist with the corresponding lower hanging point on the lifted steel structure through the lifting special steel strand, lifting height and lifting amplitude without limitation, step-by-step upward movement of the lifted heavy object when the hydraulic hoist repeats the action, extremely small acceleration in the action process, and negligible additional dynamic load (vibration and impact) of the steel structure lifting unit and the pre-installed structure.

[0067] Firstly, the roof layer steel truss is lifted to a certain height by the hydraulic synchronous lifting system, and then the lifting is paused. Secondly, the roof layer truss is connected with the lower suspension structure to form a whole, and then the lifting unit is lifted to a certain height by the hydraulic synchronous lifting system, and then the lifting is paused. Thirdly, the above steps are repeated until the whole truss-suspension structure is assembled, and then the roof layer truss and the lower suspension structure are lifted to the design installation elevation by the hydraulic synchronous lifting system. Finally, the truss-suspension structure is connected with the pre-installed structure to form a whole, and then the subsequent members are installed, the temporary measures are removed, and the whole steel truss-suspension structure installation is completed.

[0068] In the embodiment, the steel structure lifting unit and the hydraulic synchronous lifting system are checked again before the trial lifting in the steps S5, S9 and S12 to confirm whether all the temporary measures meet the design requirements. After the confirmation, the trial lifting is started, and the lifting is paused after the lifting unit is lifted by about 100 mm. The elevations of the lifting points of the lifting unit are adjusted to make the lifting unit in the design posture, and the lifting unit is kept still for 2-24 hours.

[0069] Specifically, in the steps S6, S10 and S13, the steel structure lifting unit and the hydraulic synchronous lifting system are checked again before the formal lifting to confirm whether there is any abnormality. After the confirmation, the formal lifting is started.

[0070] Specifically, in the step S14, the members are installed after the hydraulic lifting system and the lifting temporary measures are removed, so that the whole steel truss-suspension structure forms a whole stable force system. Then, the hydraulic synchronous lifting system is unloaded 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 strand is completely relaxed, and the load of the lifting unit is completely transferred to the pre-installed structure support.

[0071] As can be seen from the above, firstly, the upper truss of the steel structure lifting unit is assembled into a whole lifting unit (excluding the members connected with the support) on the ground floor directly below the projection surface. Secondly, the lifting platform (upper lifting point) is set by the pre-installed structure, and one XY-TS-315 type hydraulic lifter is arranged in each lifting platform. Thirdly, the lower lifting point temporary lifting tool and the reinforcing member are installed at the position corresponding to the upper chord of the steel structure lifting unit and the upper lifting point. Fourthly, the upper and lower lifting points are connected by the special bottom anchor and the steel strand. Finally, the lifting unit is lifted as a whole by the hydraulic synchronous lifting system.

[0072] The third embodiment is basically the same as the previous embodiment, except that in the step S5, when the hierarchical loading is about to leave the jig, the points may not leave the ground at the same time, at which time the lifting speed should be reduced, and the situation of each point leaving the ground should be closely observed, and if necessary, the "single-point" lifting should be done to ensure the stable lifting of the lifting unit leaving the ground.

[0073] Specifically, in the step S6, before the formal lifting, the level instrument is used to detect the distance of each lifting point from the ground, the relative height difference of each lifting point is calculated, the height of each lifting point is adjusted, the lifting unit reaches the designed posture, and the adjusted height of each lifting point is taken as the new starting position, the displacement sensor is reset, and during the overall lifting process, the posture is maintained until the lifting is near the predetermined elevation, and before the adjustment starts, the computer synchronous control system is switched from the automatic mode to the manual mode.

[0074] Specifically, in the step S13, after the lifting is paused, the actual elevation of each lifting point is measured and compared with the designed elevation, and the record is made as the basis for the height of the continued lifting, then according to the comparison result, the lifting speed is reduced, and the "fine adjustment, point-by-point" function of the hydraulic synchronous lifting computer control system is used to make each lifting point reach the designed position, and then the lifting is temporarily stopped to complete the welding work at the segmented place of the roof layer truss, so that the pre-assembled structure and the top truss of the lifting unit are connected into a whole, and then the temporary steel support on the ground is removed for the installation of the later assembled rod members.

[0075] As can be seen from the above, by using the stroke and displacement sensor monitoring and computer control, through data feedback and control instruction transmission, the operator can observe the hydraulic lifting process and related data and issue control instructions through the man-machine interface of the hydraulic synchronous computer control system, the hydraulic synchronous lifting synchronizes the lifting points through computer control, the member maintains a stable lifting posture during the lifting process, the synchronous control precision is high. The hydraulic lifting system has a millimeter-level fine adjustment function, can realize vertical precise positioning in the air, adopts a centralized control system, is easy to operate, has a high automation level, the hydraulic cylinder has a multi-group synchronization and single-group adjustment function, and can be arbitrarily combined with units. At the same time, the multi-point synchronous lifting has a small deviation, a small impact, a stable running during the lifting process, a good safety, a high reliability, and a strong versatility.

[0076] Further, the design application is applied to the structural construction of the truss-suspension structure based on the pre-installed structure, first, the roof layer steel truss is lifted to a certain height by the hydraulic synchronous lifting system, and then the lifting is paused, second, the roof layer truss is assembled on the ground floor below the projection surface to connect the top truss into a whole, third, the lifting unit is lifted to a certain height by the hydraulic synchronous lifting system, and then the lifting is paused, then the above steps are repeated until the whole truss-suspension structure is assembled, the roof layer truss and the suspended structure below are lifted to the design installation elevation by the hydraulic synchronous lifting system, finally, the truss-suspension structure is connected with the pre-installed structure into a whole, the subsequent rod is installed, the temporary measures are removed, and the whole steel truss-suspension structure installation is completed; the purpose is to avoid large internal force and deformation in the construction process, reduce the safety risk, and improve the work efficiency.

[0077] Importantly, it should be noted that the constructions and arrangements of the present application shown in the various exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) using the concepts taught without departing from the novel teachings and advantages described. For example, an element shown as a single integrated structure can be divided into separate elements or implemented in another way, the positions of elements can be reversed or otherwise changed, and the nature or number of elements can be changed or modified. Accordingly, all such modifications are intended to be included within the scope of the present application. The order or sequence of any process or method steps can be changed or re-sequenced without departing from the scope of the application. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the application. Accordingly, the present application is not limited to particular embodiments described, but extends to various modifications, combinations and permutations of the described embodiments.

[0078] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual implementation can not be described (i.e., those unrelated to the best mode of practicing the present application currently contemplated).

[0079] It is to be understood that the development of the particular implementations described herein was motivated by the desire to solve real-world problems, and as such the claimed implementations can be susceptible to further implementation known to those of ordinary skill in the art. It is the intent of the claims that covers all such variations and modifications, many of which can be specific to a given integrated circuit chip design. The disclosure herein of any particular implementation described herein is purely illustrative, and does not limit the scope of the claims that cover all implementations consistent with the claims.

[0080] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A pre-erected structure based truss-slinging structure inversion method cumulative hydraulic lifting construction method, characterized in that: The specific steps are as follows: S1, construction preparation: install the pre-installed structure in place and prepare the hydraulic lifting system; S2, ground assembly of the roof truss structure: using 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 link, vertical web, upper chord and connecting web in turn, and detect after the overall assembly correction is completed; S3, installation of temporary measures for the lifting system: install the lifting platform, lower lifting point temporary lifting device, lower lifting point reinforcing members and guide frame in turn; S4, installation and debugging of the lifting system: install the steel strand, hydraulic lifter and special base anchor in turn, connect the hydraulic pipeline and control and power lines, and then debug the lifting system; S5, trial lifting of the first lifting unit: load in order of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the design load of the first lifting unit, until the lifting unit is separated from the assembly jig; S6, formal lifting of the first lifting unit: stop lifting after lifting the lifting unit to the predetermined height, and the predetermined lifting height is preferably suitable for the ground installation of the next layer of suspended structure of the roof truss; S7, installation of temporary support for the lifting unit: install temporary steel support under the lifting unit after each lifting unit is lifted to the predetermined height, and the temporary steel support is installed at the lower chord main node of the first lifting unit truss; S8, installation of the next layer of suspended structure of the truss; S9, trial lifting of the second lifting unit: take the roof layer truss and the suspended structure hung below as the second lifting unit, load in 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 jig; S10, formal lifting of the second lifting unit: stop lifting after lifting the second lifting unit to the predetermined height, and adjust the position of the temporary steel support at the bottom of the lifting unit to support at the main node of the bottom chord of the second lifting unit; S11, installation of the second layer of suspended structure of the truss: assemble the second layer of suspended structure of the truss to make it connected as a whole with the upper steel structure; S12, trial lifting of the third lifting unit: take the roof layer truss and the suspended structure hung below as the third lifting unit, load in 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 jig; S13, formal lifting of the third lifting unit: stop lifting when the third lifting unit is lifted to about 800mm from the design elevation; S14, removal of temporary facilities after installation is completed: remove the hydraulic lifting system equipment and lifting temporary measure structure, and the steel truss-suspended structure hydraulic lifting construction is completed. The S6 step is to detect the distance from the ground of each lifting point by using a level before officially lifting, to calculate the relative height difference of each lifting point, to adjust the height of each lifting point so that each lifting unit reaches the design posture, to take the adjusted height of each lifting point as a new starting position, to reset the displacement sensor, to keep the posture during the overall lifting until the lifting reaches the vicinity of the predetermined elevation, and to switch the computer synchronous control system from the automatic mode to the manual mode before the adjustment starts; The S5, S9 and S12 steps are to check again whether all the temporary measures of the steel structure lifting unit and the hydraulic synchronous lifting system meet the design requirements before trial lifting, to start the trial lifting after confirming that there is no error, to pause the lifting after the lifting unit is lifted by about 100 mm, to fine-tune the elevation of each lifting point of the lifting unit so that the lifting unit is in the design posture, and to stand still for 2-24 hours; The S13 step is to measure the actual elevation of each lifting point after pausing the lifting, to compare it with the design elevation, to make a record as the basis for the height to be continuously lifted, to lower the lifting speed according to the comparison result, to use the "fine-tuning and inching" function of the hydraulic synchronous lifting computer control system so that each lifting point reaches the design position, to temporarily lift, to complete the welding work at the segmented place of the roof layer truss, to make the pre-installed structure and the top truss of the lifting unit into a whole, and to remove the ground temporary steel support of the lifting unit for the installation of the post-installed members; The S14 step is to install the post-installed members before removing the hydraulic lifting system equipment and the lifting temporary measure structure, to make the whole steel truss-suspended structure into a whole stable force system, and then to make the hydraulic synchronous lifting system sequentially and gradually unload at the order of 95%, 90%, 80%, 70%, 60%, 50%, 40% and 20% of the total mass of the truss-suspended structure, until the steel strand is completely relaxed and the load of the lifting unit is completely transferred to the pre-installed structure support.

2. The pre-erection based truss-sling structure inversion method cumulative hydraulic hoisting construction method according to claim 1, characterized in that: The S1 step is to install the pre-installed structure and part of the truss structure connected with the pre-installed structure in place according to the deepened design structure segmentation.

3. The pre-erected structure based, truss-sling structure inverted method cumulative hydraulic hoisting construction method according to claim 2, characterized in that: The S3 step is to set a hydraulic lifter on the lifting platform, and the hydraulic lifter is connected with the corresponding lower lifting point on the ground truss lifting unit through a special steel strand.

4. The pre-erected structure based, truss-sling structure inverted method cumulative hydraulic hoisting construction method according to claim 3, characterized in that: The S4 step is to adopt the bottom-up threading method, to thread the steel strand from the bottom to the top of the hydraulic lifter, to thread the lower end of the steel strand bundle into the bottom anchor structure of the corresponding lower lifting point directly below, to lock after adjustment, and each hydraulic lifter corresponds to a set of special bottom anchor structure, the bottom anchor structure is installed inside the temporary lifting device of the lower lifting point, and each set of bottom anchor and the hydraulic lifter and the lifting point structure opening hole vertically above it should be vertically corresponding and concentrically installed.

5. The pre-erected structure based, truss-sling structure inverted method cumulative hydraulic hoisting construction method according to claim 4, characterized in that: The S5 step is that when the lifting unit is about to leave the jig frame after the staged loading, there may be different times of each point leaving the ground, at which time the lifting speed should be reduced, and the situation of each point leaving the ground should be closely observed, and if necessary, "single point" lifting should be done.

6. The pre-structure based truss-sling structure flip-over method cumulative hydraulic hoisting construction method according to claim 1, characterized in that: The S6, S10 and S13 steps are to check again whether there is any abnormality in the steel structure lifting unit and the hydraulic synchronous lifting temporary measure before officially lifting, and to start the official lifting after confirming that there is no abnormality.

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