Long-span continuous steel truss girder multi-point synchronous automatic circulation alternate sliding shoe jacking system and its construction method

Abstract

A long-span continuous steel truss girder multi-point synchronous automatic circulation alternate jacking sliding shoe jacking system, including: steel truss girder assembly platform, jacking steel guide beam, temporary pier, slideway and control system; slideway includes main slideway The main slideway is provided with a vertically adjustable height-adjustable jacking shoe, and the reaction frame of the continuous jacking jack used to install the pushing steel truss beam is set at the front end of the main slideway; the jacking shoe There is a set of jacking shoe horizontal jacks on both sides, continuous jacking jacks, jacking shoe horizontal jacks and jacking shoe vertical jacks constitute a jacking and sliding hydraulic jack system, and each set of jacks is equipped with pressure sensors and displacement Sensors are used to detect the pressure of each jack, the displacement of the hydraulic cylinder and the specific position of the push shoe; all the control data of the hydraulic control system on each slideway are fed back to the main control computer, and the computer sends a message to the hydraulic control system. Control instructions to realize synchronous push construction, and its construction method is fast, safe and reliable.

Description

technical field [0001] The invention relates to bridge construction equipment and a construction method thereof, in particular to a large-span continuous steel truss girder jacking system and a construction method thereof. Background technique [0002] Steel truss is a relatively prominent bridge structure in transportation infrastructure, especially suitable for railway bridges, or road-rail bridges; for construction environments, especially in gully and canyon areas, large-span canyon bridges that are extremely inconvenient for large-scale transportation , the steel truss structure is one of the necessary structures in the industry; in terms of safety, quality, economy, etc., the construction of steel truss structure bridges with heavy weight, large span, and complex construction environment must adapt to the requirements of the times, and adopt new technologies and new processes And optimize the existing technology to serve this kind of bridge construction, and achieve th...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the large tonnage of the steel truss girder, the large reaction force of the support point, the height of the slider cannot be adjusted, the "feeding" is difficult, the local stress increases, and the damage of the slider becomes a common phenomenon, and the height of the slider cannot be adjusted. , Immediately” adjust the height to compensate for the elevation construction error and uneven settlement error of each pier and abutment, which makes the jacking process unfavorable for controlling the jacking friction resistance, increasing safety risks, and the quality of steel truss girder erection is difficult to guarantee;

[0005] 2. For the sake of safety, the designer deliberately enlarged the safety reserve during structural design, which affected the economical efficiency of construction;

[0006] 3. Temporary welding and bolting of the connection point between the fixed end of the pull-type jacking and the steel truss beam will cause construction damage to the main structure. Heavy machinery cooperates with the construction, which is extremely inconvenient for construction, and the degree of automation is not high, so it is very difficult to implement;

[0007] 4. The existing long-span steel truss girder pull-type jacking construction. The jacking and axis adjustment are independent systems. Therefore, when the axis needs to be adjusted during the jacking process, the jacking construction must be suspended, which limits the continuity and stability of the jacking construction. Controllability;

[0008] 5. The existing walking-type jacking that can be adjusted vertically cannot satisfy the main girder structure of non-uniform cross-section, especially the main girder of orthotropic slab deck structure without longitudinal girder, while the steel truss girder for joint stress It is more difficult to adapt, and it is impossible to carry out jacking construction

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