Large-span space pipe truss structure accumulative slippage construction technology

Abstract

The invention belongs to the technical field of pipe truss construction, and relates to a large-span space pipe truss structure accumulative slippage construction technology which is used for installing a slippage track used for large-span space pipe truss structure accumulative slippage construction. Truss sliding folding of the large-span space pipe truss structure is conducted; after the trusses of the large-span space pipe truss structure slide and are folded, the temporary connections are opened to unfold and slide the trusses; replacing the support and removing the track; therefore, the construction efficiency of large-span space pipe truss construction is improved, the recycling performance is good, and the universality and reliability of hydraulic pushing equipment with the construction function are good. The defects that in the prior art, in the aspect of construction of the large-span space pipe truss, construction efficiency is low, recycling performance is insufficient, and universality and reliability of hydraulic pushing equipment for construction are insufficient are effectively overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of tube truss construction, and in particular relates to a cumulative sliding construction process for a large-span spatial tube truss structure. Background Art

[0002] Large-span spatial tube truss structural systems are widely used in projects such as railway station waiting halls, airport terminal roofs, high-rise skywalks, large exhibition hall (convention and exhibition center) roof structures, and large sports stadiums. Due to the generally large spans and large structural dimensions of such structures, conventional steel structure hoisting solutions are no longer applicable in terms of economy and safety.

[0003] As mentioned in the prior art solution with patent publication number "CN110333038A", the application of large-span space tube trusses is becoming more and more extensive. However, at present, there are common problems in the construction of large-span space tube trusses, such as low construction efficiency, insufficient recycling, and insufficient versatility and reliability of the hydraulic jacking equipment used in the construction. Summary of the Invention

[0004] In order to solve the defects in the existing technology, the present invention provides a cumulative sliding construction process for a large-span spatial tube truss structure, which effectively avoids the defects of the existing technology in the construction of large-span spatial tube trusses, such as low construction efficiency, insufficient recycling, and insufficient versatility and reliability of the hydraulic jacking equipment used in the construction.

[0005] The present invention utilizes the following technical solutions.

[0006] A cumulative sliding construction process for a large-span spatial tube truss structure, comprising: Installation of sliding tracks used for cumulative sliding construction of large-span spatial tube truss structures; Perform truss sliding and folding of large-span spatial tube truss structures; After the trusses of the large-span space tube truss structure are folded and slid, temporary connections are opened to unfold and slide the trusses. Carry out bearing replacement and track removal.

[0007] Furthermore, a method for installing a sliding track for cumulative sliding construction of a large-span spatial tube truss structure includes: For the cumulative sliding construction of large-span spatial tube truss structures, sliding tracks are provided at preset sliding positions, and a sliding pushing point is set at every interval of two truss supports. A set number of sliding pushing points are set in total, and a 100t hydraulic pusher is set at each sliding pushing point.

[0008] Furthermore, the center line of the sliding track coincides with the center line of the truss support; a sliding shoe is provided on the sliding track, and the sliding stopper has a specification of 30×30×150mm and is welded to the web of the sliding beam carrying the sliding track, and the weld height of the sliding stopper is hf=10mm.

[0009] Furthermore, the front end of the hydraulic jack is connected to the ear plate on the truss as the pushed component through a pin shaft and fixed. The jacking ear plate has a thickness of t=20mm, and the jacking ear plate is set on the support of the jacking hydraulic jack.

[0010] The rated thrust of a single 100t hydraulic jack is 100t, and the reduction factor is 0.7. The total thrust design value of the jacking point is 100x0.7=70t>54.6t; The hydraulic pump source system provides hydraulic power for the hydraulic thruster.

[0011] Furthermore, the pump source hydraulic system adopts a modular structure. According to the arrangement of the pushing points of the jacking weights, the number of hydraulic pushers and the hydraulic pump source flow, multiple modules can be combined. Each set of modules is based on a hydraulic pump source system and can independently control a group of hydraulic pushers.

[0012] Furthermore, the hydraulic jacking process includes: Step 1: The hydraulic pusher block is installed on the slideway of the sliding track, and the main hydraulic cylinder barrel ear plate is connected to the pushed structure through the pin shaft; the hydraulic pusher main hydraulic cylinder extends the cylinder, pushing the pushed structure forward to slide. The pushed structure is a truss; Step 2: The main hydraulic cylinder of the hydraulic jack extends continuously for one stroke, pushing the pushed structure to slide forward for a certain distance; Step 3: After one stroke of the cylinder is extended, the pushed structure is immobilized; the main hydraulic cylinder of the hydraulic jack is retracted, so that the jacking device and the slide baffle are released and move forward with the main hydraulic cylinder; Step 4: After the main hydraulic cylinder has completed one stroke of retraction, the jacking device is dragged forward one step, and the jacking and sliding of one stroke is completed. Then, the process returns to step 1 to execute the jacking and sliding of the next stroke.

[0013] Furthermore, a method for sliding and folding the trusses of a large-span spatial tube truss structure includes: The cumulative sliding method is used to slide and fold the trusses of the large-span spatial tube truss structure. Temporary tie rods are added between the trusses. The temporary tie rods are made of P168*9 steel pipes made of Q235B and are connected to the trusses in front and behind them by intersecting node welding.

[0014] Furthermore, after the trusses of the large-span spatial tube truss structure are slid and folded, a method for opening temporary connections to unfold and slide each truss includes: Open the temporary tie rods used as temporary connections, and then install the secondary trusses by pushing a wheelbase between each truss using a hydraulic pusher.

[0015] Furthermore, the method for bearing replacement and track removal includes: The temporary supports are replaced with truss supports and the sliding tracks are removed.

[0016] The beneficial effects of the present invention are that, compared with the prior art, the present invention installs sliding tracks for cumulative sliding construction of large-span space tube truss structures; performs sliding and folding of the trusses of the large-span space tube truss structure; after the trusses of the large-span space tube truss structure are sliding and folded, temporary connections are opened to unfold and slide each truss; supports are replaced and tracks are removed; thereby improving the construction efficiency of large-span space tube truss construction, and achieving good recyclability, and the versatility and reliability of the hydraulic jacking equipment used in construction. This effectively avoids the defects of the prior art in large-span space tube truss construction, such as low construction efficiency, insufficient recyclability, and insufficient versatility and reliability of the hydraulic jacking equipment used in construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the sliding push point in the present invention, wherein the black dots represent the sliding push points; Figure 2 : is a vertical position diagram of the temporary tie rod in the present invention, and the component pointed by the arrow is the temporary tie rod; Figure 3 It is a cross-sectional position diagram of the temporary pull rod in the present invention; Figure 4 It is a partial flow chart of the cumulative sliding construction process of the large-span spatial tube truss structure in the present invention. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely express the technical solutions of the present invention. The embodiments expressed in this application are only part of the embodiments of the present invention, not all of the embodiments. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without making creative work are all within the scope of protection of the present invention.

[0019] like Figure 4 As shown, the cumulative sliding construction process of a large-span spatial tube truss structure described in the present invention includes: Installation of sliding tracks used for cumulative sliding construction of large-span spatial tube truss structures; Perform truss sliding and folding of large-span spatial tube truss structures; After the trusses of the large-span space tube truss structure are folded and slid, temporary connections are opened to unfold and slide the trusses. Carry out bearing replacement and track removal.

[0020] In a preferred but non-limiting embodiment of the present invention, a method for installing a sliding track for cumulative sliding construction of a large-span spatial tube truss structure comprises: For the cumulative sliding construction of the large-span space tube truss structure, a sliding track is provided at the preset sliding position, just as two sliding tracks are provided, which are respectively set at the intersection of the preset axis A and axis Q in the space of the large-span space tube truss structure and the axis 16 and axis 54 respectively. Figure 1 As shown, a sliding jacking point is set at every two truss supports, and a set number of sliding jacking points are set in total. A 100t hydraulic jacking device is set at each sliding jacking point.

[0021] In a preferred but non-limiting embodiment of the present invention, the sliding track serves as a load-bearing, guiding mechanism, and lateral displacement limiter during the sliding movement of the long-span spatial tube truss structure. The centerline of the sliding track coincides with the centerline of the truss support. The top surface of the ground beam of the long-span spatial tube truss structure is precast to form an inclined surface consistent with the top surface of the columns. The sliding track is equipped with a sliding shoe. The sliding stopper measures 30×30×150mm and is welded to the web of the sliding beam supporting the sliding track. The weld height hf of the sliding stopper is 10mm.

[0022] In a preferred but non-limiting embodiment of the present invention, the front end of the hydraulic jack is connected and fixed to the ear plate on the truss serving as the pushed member through a pin shaft to transmit the horizontal sliding jacking force. The jacking ear plate has a thickness of t=20 mm (made of Q345B). The jacking ear plate is arranged on the support of the jacking hydraulic jack. The jacking ear plate is welded by full penetration welding, and the weld grade is level 2.

[0023] The installation requirements of the sliding track of the present invention are as follows: In order to ensure the smoothness of the inner surface of the slideway, reduce the obstruction during the sliding process and lower the sliding friction coefficient, the slideway should be laid in the following ways: (1) The surface of the sliding track beam should be horizontal; (2) The splicing position should be flat and there should be no height difference; (3) The offset between the center line of the sliding beam and the center line of the sliding should be controlled within ±10mm; (4) The contact point between the steel sliding shoe and the sliding beam should be lubricated with grease before sliding.

[0024] The installation requirements for the slide side blocks of the sliding track are as follows: The side blocks of the slideway play a role in directly resisting the push reaction force and controlling the sliding accuracy. Therefore, the following aspects should be paid attention to during the installation process: (1) To ensure that there is sufficient contact surface between the slide side block and the push support, the slide side baffle should be installed strictly in accordance with the design type of the drawing; (2) The weld height between the slideway side block and the sliding beam should meet the design requirements to meet the use requirements of resisting the thrust reaction force; (3) The starting installation position of the side blocks on all sliding beams should be at the same axis position, and the starting point should be reset at each axis position to reduce the cumulative installation error and meet the requirements of sliding synchronization; (4) The installation error of the side blocks on both sides of the same sliding beam should be less than 1mm, and the spacing error between adjacent slide side blocks should be less than 3mm; (5) Welding is strictly prohibited in front of the side block (in the direction of sliding forward).

[0025] In a preferred but non-limiting embodiment of the present invention, the hydraulic pusher is further configured with a hydraulic pump source system, a sensor detection and synchronization control system, and the configuration of the hydraulic push sliding system is carried out in accordance with the principles of safety, compliance and practicality; The rated thrust of the hydraulic jack is 100t.

[0026] The overall configuration principles of the hydraulic jack are as follows: (1) Meet the requirements of the cumulative sliding driving force of the truss structure and try to make each hydraulic thruster load evenly; (2) Try to ensure that the number of hydraulic thrusters driven by each hydraulic pump station is equal to improve the utilization rate of the hydraulic pump source system; (3) When making the overall layout, the safety and reliability of the system should be carefully considered to reduce engineering risks.

[0027] (3) The selection of hydraulic thrusters is as follows: During the sliding process, the thrust applied by the hydraulic pusher and the friction force F between all the sliding shoes and the sliding rails reach a balance.

[0028] The weight of a single platform for sliding is less than 280t. Calculated based on 280t, the friction coefficient is 0.15, the resistance coefficient is 1.3, and the maximum total thrust required for a single platform is 280x0.15x1.3=54.6t. In the present invention, one 100t hydraulic jack is arranged at each jacking point. The rated thrust of a single 100t hydraulic jack is 100t, and the reduction coefficient is 0.7. The total thrust design value of the jacking point is 100x0.7=70t>54.6t, which can meet the requirements of sliding construction. The electrical synchronous control system includes a power control system, a power drive system, a sensor detection system and a computer control system; The hydraulic pump source system provides hydraulic power for the hydraulic thruster and completes the corresponding actions under the control of various hydraulic valves.

[0029] In a preferred but non-limiting embodiment of the present invention, in different engineering applications, since the arrangement of the pushing points and the configuration of the hydraulic pushers are different, in order to improve the versatility and reliability of the hydraulic pushing equipment, the design of the pump source hydraulic system adopts a modular structure. According to the arrangement of the pushing points of the pushing weight, the number of hydraulic pushers and the hydraulic pump source flow rate, multiple modules can be combined. Each set of modules is centered on a hydraulic pump source system and can independently control a group of hydraulic pushers. At the same time, a proportional valve block box can be used for multi-point expansion to meet the actual needs of various types of sliding projects.

[0030] As in the present invention, each sliding zone is equipped with 12 hydraulic pump source systems. The hydraulic pump source system is arranged at each pusher position and moves with the truss during the sliding process.

[0031] The electrical synchronous control system consists of a power control system, a power drive system, a sensor detection system and a computer control system.

[0032] The hydraulic synchronous jacking construction technology adopts stroke and displacement sensor monitoring and computer control. Through data feedback and control command transmission, it can fully automatically realize multiple functions such as synchronous action, load balancing, posture correction, stress control, operation locking, process display and fault alarm.

[0033] Operators can observe the hydraulic jacking process and related data and (or) issue control instructions through the hydraulic synchronous computer control system human-machine interface in the central control room.

[0034] In a preferred but non-limiting embodiment of the present invention, the hydraulic jacking device has a one-way locking function. When the main hydraulic cylinder extends, the jacking device operates, automatically pressing against the block. When the main hydraulic cylinder retracts, the jacking device stops operating and moves in the same direction as the main hydraulic cylinder. The hydraulic jacking process includes: Step 1: The hydraulic pusher block is installed on the slideway of the sliding track, and the main hydraulic cylinder barrel ear plate is connected to the pushed structure through the pin shaft; the hydraulic pusher main hydraulic cylinder extends the cylinder, pushing the pushed structure forward to slide. The pushed structure is a truss; Step 2: The main hydraulic cylinder of the hydraulic jack extends continuously for one stroke, pushing the pushed structure to slide forward a certain distance (one step); Step 3: After one stroke of the cylinder is extended, the pushed structure is immobilized; the main hydraulic cylinder of the hydraulic jack is retracted, so that the jacking device and the slide baffle are released and move forward with the main hydraulic cylinder; Step 4: After the main hydraulic cylinder has completed one stroke of retraction, the jacking device is dragged forward one step, and the jacking and sliding of one stroke is completed. Then, the process returns to step 1 to execute the jacking and sliding of the next stroke.

[0035] In a preferred but non-limiting embodiment of the present invention, a method for sliding and folding a truss of a large-span spatial tube truss structure comprises: The cumulative sliding method is used to slide and fold the trusses of the large-span space tube truss structure. The secondary trusses cannot be installed temporarily. In order to ensure the structural safety during the sliding process, Figures 2 to 3 As shown, temporary tie rods need to be added between the trusses. The temporary tie rods are made of P168*9 steel pipes made of Q235B and are connected to the trusses in front and behind them by intersecting node welding.

[0036] In a preferred but non-limiting embodiment of the present invention, after the trusses of a large-span spatial tube truss structure are slid and folded, a method for opening temporary connections to unfold and slide each truss comprises: Open the temporary tie rods used as temporary connections, and then install the secondary trusses by pushing a wheelbase between each truss using a hydraulic pusher.

[0037] In a preferred but non-limiting embodiment of the present invention, the method for supporting replacement and track removal comprises: The temporary supports are replaced with truss supports and the sliding tracks are removed.

[0038] The beneficial effects of the present invention are that, compared with the prior art, the present invention installs sliding tracks for cumulative sliding construction of large-span space tube truss structures; performs sliding and folding of the trusses of the large-span space tube truss structure; after the trusses of the large-span space tube truss structure are sliding and folded, temporary connections are opened to unfold and slide each truss; supports are replaced and tracks are removed; thereby improving the construction efficiency of large-span space tube truss construction, and achieving good recyclability, and the versatility and reliability of the hydraulic jacking equipment used in construction. This effectively avoids the defects of the prior art in large-span space tube truss construction, such as low construction efficiency, insufficient recyclability, and insufficient versatility and reliability of the hydraulic jacking equipment used in construction.

[0039] Finally, 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 above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention should be covered within the protection space of the claims of the present invention.

Claims

1. A large-span space tube truss structure cumulative sliding construction process, characterized in that: include: Installation of sliding tracks used for cumulative sliding construction of large-span spatial tube truss structures; Perform truss sliding and folding of large-span spatial tube truss structures; After the trusses of the large-span space tube truss structure are folded and slid, temporary connections are opened to unfold and slide the trusses. Carry out bearing replacement and track removal.

2. The cumulative sliding construction process for a large-span space tube truss structure according to claim 1 is characterized in that: The method for installing a sliding track used for cumulative sliding construction of a large-span space tube truss structure comprises: For the cumulative sliding construction of large-span spatial tube truss structures, sliding tracks are provided at preset sliding positions, and a sliding pushing point is set at every interval of two truss supports. A set number of sliding pushing points are set in total, and a 100t hydraulic pusher is set at each sliding pushing point.

3. The cumulative sliding construction process for a large-span space tube truss structure according to claim 2 is characterized in that: The center line of the sliding track coincides with the center line of the truss support; a sliding shoe is provided on the sliding track, and the sliding stopper has a specification of 30×30×150mm and is welded to the web of the sliding beam that carries the sliding track. The weld height of the sliding stopper is hf=10mm.

4. The cumulative sliding construction process for a large-span space tube truss structure according to claim 3 is characterized in that: The front end of the hydraulic jack is connected to the ear plate on the truss as the pushed component through a pin shaft to fix the jacking ear plate. The thickness of the jacking ear plate is t=20mm, and the jacking ear plate is set on the support of the jacking hydraulic jack.

5. The cumulative sliding construction process for a large-span space tube truss structure according to claim 4 is characterized in that: The rated thrust of a single 100t hydraulic jack is 100t, and the reduction factor is 0.

7. The total thrust design value of the jacking point is 100x0.7=70t>54.6t; The hydraulic pump source system provides hydraulic power for the hydraulic thruster.

6. The cumulative sliding construction process for a large-span space tube truss structure according to claim 5 is characterized in that: The pump source hydraulic system adopts a modular structure. According to the layout of the pushing points of the jacking weights, the number of hydraulic jacks and the hydraulic pump source flow, multiple modules can be combined. Each set of modules is based on a hydraulic pump source system and can independently control a group of hydraulic jacks.

7. The cumulative sliding construction process for a large-span space tube truss structure according to claim 6 is characterized in that: The hydraulic thruster workflow includes: Step 1: The hydraulic pusher block is installed on the slideway of the sliding track, and the main hydraulic cylinder barrel ear plate is connected to the pushed structure through the pin shaft; the hydraulic pusher main hydraulic cylinder extends the cylinder, pushing the pushed structure forward to slide. The pushed structure is a truss; Step 2: The main hydraulic cylinder of the hydraulic jack extends continuously for one stroke, pushing the pushed structure to slide forward for a certain distance; Step 3: After one stroke of the cylinder is extended, the pushed structure is immobilized; the main hydraulic cylinder of the hydraulic jack is retracted, so that the jacking device and the slide baffle are released and move forward with the main hydraulic cylinder; Step 4: After the main hydraulic cylinder has completed one stroke of retraction, the jacking device is dragged forward one step, and the jacking and sliding of one stroke is completed. Then, the process returns to step 1 to execute the jacking and sliding of the next stroke.

8. The cumulative sliding construction process for a large-span space tube truss structure according to claim 7 is characterized in that: A method for sliding and folding trusses of a large-span spatial tube truss structure comprises: The cumulative sliding method is used to slide and fold the trusses of the large-span spatial tube truss structure. Temporary tie rods are added between the trusses. The temporary tie rods are made of P168*9 steel pipes made of Q235B and are connected to the trusses in front and behind them by intersecting node welding.

9. The cumulative sliding construction process for a large-span spatial tube truss structure according to claim 8 is characterized in that: After the trusses of a large-span space tube truss structure are folded and slid, a method for opening temporary connections to unfold and slide each truss includes: Open the temporary tie rods used as temporary connections, and then install the secondary trusses by pushing a wheelbase between each truss using a hydraulic pusher.

10. The cumulative sliding construction process for a large-span space tube truss structure according to claim 9 is characterized in that: Methods for bearing replacement and track removal include: The temporary supports are replaced with truss supports and the sliding tracks are removed.

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