Unloading-free sliding construction method for plane truss

Abstract

The invention provides an unloading-free sliding construction method for a plane truss, which comprises the following steps of: arranging a sliding track on a preset sliding path, arranging an offset sliding shoe at the end of the truss, and connecting a truss column and a bracket into an integral node through a reinforcing plate; the perpendicularity adjusting device is used for adjusting the perpendicularity of the truss and temporarily supporting the truss; after the truss slides to a target position, a sliding rail in a support area is cut off; mounting the support from the side surface to the lower part of the truss column and welding; and finally, the offset sliding shoe is cut off, the load is directly converted from the sliding shoe to the support, and unloading is not needed in the whole construction process. Through the design of the offset sliding shoes and the overall nodes, the problems that in a traditional sliding technology, the unloading process is complex, and the stress redistribution risk is high are solved, and the method has the advantages of being safe in construction, high in efficiency and easy and convenient to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure construction of building engineering, and particularly relates to a plane truss unloading-free sliding construction method. BACKGROUND

[0002] The plane truss is widely applied in large-span buildings such as gymnasiums, terminal buildings and exhibition centers due to its high structural efficiency and large span. For the installation of such a structure, the sliding construction method is a common and effective technology.

[0003] However, the traditional sliding process has significant defects. Usually, the sliding shoe is directly arranged below the end column of the truss, that is, the predetermined position of the future permanent support. This position has large rigidity and direct stress, which is reasonable in the sliding stage. However, after the sliding is completed, the subsequent procedures are extremely complicated and high-risk: first, the surrounding members of the truss column need to be temporarily reinforced and supported, then the entire truss structure needs to be jacked (unloaded) to remove the sliding shoe, then the permanent support needs to be installed, and finally the truss needs to be unloaded onto the support. This process of “unloading-removing sliding shoe-installing support-unloading again” not only has complex procedures, consumes time and effort, but more importantly, unloading means that the support conditions and internal force states of the entire truss structure are forcibly changed, which is a complex stress redistribution process. The synchronization control of multiple jacking points is extremely high in this process, and if the control is not proper, the internal force of the truss member may exceed the standard, the local deformation of the node may occur, and even the structure may be damaged, which has great safety risks and makes it difficult to guarantee the construction quality.

[0004] Therefore, there is an urgent need for a new plane truss sliding construction method that can avoid the complex unloading process, simplify the construction process, and effectively reduce the construction risk. SUMMARY

[0005] The present application aims to provide a plane truss unloading-free sliding construction method to solve the problems of complex unloading process and difficult synchronization control in the traditional sliding process.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: A plane truss unloading-free sliding construction method, comprising the following steps: S1, arranging a sliding rail on a preset sliding path, and arranging a biased sliding shoe at the end of the truss, and connecting the truss column and the truss column bracket into an integral node through a reinforcing plate; S2, adjusting the verticality of the truss using a verticality adjusting device and temporarily supporting the truss; S3, after the truss is slid to the target position, cutting off the sliding rail in the support area; S4, installing a support from the side to the bottom of the truss column, and welding the truss column and the support; S5, cut off the bias shoe, complete the load conversion from the shoe to the support.

[0007] Further, the bias shoe is welded on the truss column bracket, and a space for installing the support is left between the truss column and the bias shoe.

[0008] Further, the bias shoe is connected with a crawling pusher, the crawling pusher comprises a hinged piece for connecting the bias shoe, a hydraulic cylinder connected with one end of the hinged piece, and a clamping device for clamping the sliding rail connected with the other end of the hydraulic cylinder; the hydraulic cylinder extends the cylinder when the clamping device clamps the sliding rail, and pushes the bias shoe to drive the truss to slide.

[0009] Further, the perpendicularity adjusting device comprises a short column, a platform plate and a jack, the height of the short column is consistent with the sliding rail, the platform plate is closely attached to the short column and the sliding rail, and the jack is placed on the platform plate to adjust the jacking or falling of the truss bracket.

[0010] Further, after the adjacent two trusses are connected into a whole, the perpendicularity adjusting device is removed.

[0011] Further, when the height of the truss is large, the perpendicularity adjusting device is used in cooperation with the cable wind rope or steel support.

[0012] From the above technical solution, compared with the prior art, the present application has the following advantages: (1) The present application reserves a mounting space for the support through the innovative design of the bias shoe, and after sliding into position, the support can be directly installed and the load conversion is completed without unloading the truss, completely avoiding the risk of stress redistribution caused by unloading out of synchronization, greatly improving the construction safety; (2) The present application eliminates the complex processes such as temporary reinforcement, overall jacking unloading, and removal of the shoe in the traditional process, greatly simplifies the construction process, significantly shortens the construction period, and improves the construction efficiency; (3) The present application forms an integral node through the reinforcing plate, which enhances the stiffness and bearing capacity of the bias bracket; the use of the perpendicularity adjusting device effectively ensures the stability of the single truss in the early stage of sliding, so that the method is applicable to the construction of planar trusses of different heights and spans; (4) The present application uses a crawling pusher as a sliding force device, the pushing force is directly applied to the shoe, the transmission path is clear, and synchronous and controllable precise pushing can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The figure is a step flowchart of the planar truss unloading-free sliding construction method of the present application; Figure 2This is a schematic diagram showing the arrangement of the sliding track, offset slipper, and reinforcing plate of the present invention; Figure 3 This is a schematic diagram showing the verticality adjustment device of the present invention in use; Figure 4 This is a schematic diagram of the specific structure of the verticality adjustment device of the present invention; Figure 5 This is a schematic diagram showing the removal of the verticality adjustment device after the two trusses of the present invention are connected as one unit; Figures 6a-6c This is a schematic diagram of the sliding construction steps of the present invention.

[0014] In the diagram: 1. Truss; 11. Truss column; 12. Corbel; 2. Offset slipper; 3. Reinforcing plate; 4. Sliding track; 5. Verticality adjustment device; 51. Short column; 52. Platform plate; 53. Jack; 6. Support. Detailed Implementation

[0015] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0016] like Figures 1 to 6c As shown, a planar truss sliding construction method without unloading according to the present invention is implemented according to the following steps: First, construction preparation is carried out. Two parallel sliding tracks 4 are laid and precisely leveled along the pre-set sliding path, ensuring their elevation, axis, and flatness meet design requirements. On the truss column 11 at the end of the truss 1, offset sliding shoes 2 are welded to the end of the corbel 12 of the truss column 11, and the truss column 11 and corbel 12 are firmly connected by reinforcing plates 3, forming a rigid integral node to ensure structural strength under offset conditions.

[0017] Next, the truss is hoisted and its attitude adjusted. The single truss 1 is hoisted into position and supported on the offset sliding shoe 2. Due to the eccentricity of the support point, the initial stability is poor. At this time, verticality adjustment devices 5 are installed on both sides of the truss. The verticality adjustment device 5 described in this preferred embodiment includes a short column 51, a platform plate 52, and a jack 53. The height of the short column 51 is consistent with the sliding rail 4. The platform plate 52 is tightly fitted with the short column 51 and the sliding rail 4. The jack 53 is placed on the platform plate 51 to lift or lower the bracket 12. By operating the jack 53, the bracket 12 is fine-tuned until the truss 1 reaches the designed verticality. In specific operations, for high trusses, additional guy ropes or steel supports are required to enhance stability.

[0018] Then, the sliding operation is performed. The articulated piece 71 of the crawling pusher 7 is connected with the offset shoe 2, the sliding rail 4 is clamped by the clamping device 73, the hydraulic cylinder 72 is extended, the truss 1 is pushed to slide forward by one stroke; after one stroke of extension, the clamping device 73 is released from the sliding rail 4, the hydraulic cylinder 72 is retracted, and the clamping device 73 is dragged to slide forward; the cycle is repeated until the truss 1 is slid to the designed target position. When the two adjacent trusses are connected to form a stable whole, the verticality adjusting device 5 can be removed.

[0019] Finally, the system conversion is performed. After the truss is in place, a small section of the sliding rail 4 directly below the support 6 is first cut off (as shown in Figure 6a ). Then, the permanent support 6 is pushed into the reserved space from the side and placed directly below the truss column 11 (as shown in Figure 6b ). Subsequently, the bottom plate of the truss column 11 and the top plate of the support 6 are welded firmly to make them into one (as shown in Figure 6c ). Finally, the offset shoe 2 that has completed its mission is cut off. During the cutting process, the load originally borne by the shoe is directly and stably transmitted to the substructure through the welded support 6, realizing a safe and seamless support system conversion without the need for unloading throughout the process (as shown in Figure 6c ).

[0020] The above-described embodiments are merely descriptions of the preferred embodiments of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope of the present application as defined by the claims.

Claims

1. A planar truss sliding construction method without unloading, characterized in that, Includes the following steps: S1. Set a sliding track on the preset sliding path, and set an offset sliding shoe at the end of the truss. Connect the truss column and the truss column bracket into an integral node through the reinforcing plate. S2. Use a verticality adjustment device to adjust the verticality of the truss and provide temporary support; S3. After sliding the truss to the target position, cut off the sliding track in the support area; S4. Install the support from the side to the bottom of the truss column, and weld the truss column to the support; S5. Remove the offset slipper to complete the transfer of load from the slipper to the support.

2. The planar truss sliding construction method without unloading according to claim 1, characterized in that, The offset slipper is welded to the corbel of the truss column, leaving space between it and the truss column for installing the support.

3. The planar truss sliding construction method without unloading according to claim 2, characterized in that, The offset slipper is connected to a crawling pusher, which includes a hinge for connecting the offset slipper, a hydraulic cylinder with one end connected to the hinge, and a clamping device for clamping the sliding track with the other end connected to the hydraulic cylinder. When the clamping device clamps the sliding track, the hydraulic cylinder extends, pushing the offset slipper to drive the truss to slide.

4. The planar truss sliding construction method without unloading according to claim 1, characterized in that, The verticality adjustment device includes a short column, a platform plate, and a jack. The height of the short column is consistent with the sliding track. The platform plate is in close contact with the short column and the sliding track. The jack is placed on the platform plate to adjust the truss bracket by lifting or lowering it.

5. The planar truss sliding construction method without unloading according to claim 4, characterized in that, After two adjacent trusses are connected as a whole, the verticality adjustment device is removed.

6. The planar truss sliding construction method without unloading according to claim 4, characterized in that, When the truss height is large, the verticality adjustment device is used in conjunction with guy ropes or steel supports.

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