Large-span continuous steel truss multi-point synchronous automatic cyclic alternating sliding shoe push system and construction method thereof

Abstract

The invention discloses a large-span continuous steel truss multi-point synchronous automatic cyclic alternating sliding shoe push system. The system comprises a steel truss assembling platform, push steel launching noses, temporary piers, slideways and a control system. The slideways comprise primary slideways and secondary slideways, and the primary slideways are provided with push sliding shoes capable of vertical height adjustment for installing reaction frames of continuous push jacks of push steel trusses on the front ends of the primary slideways; the two sides of each push sliding shoe are each provided with a push sliding shoe transverse jack, the continuous push jacks, the push sliding shoe transverse jacks and push sliding shoe vertical jacks form a push slip hydraulic jack system, each set of jacks are provided with a pressure sensor and a displacement sensor for detecting pressure of each jack, displacement of each hydraulic cylinder and concrete positions of the push sliding shoes; and control data of the hydro-electric control system on each slideway is fed back to a master control computer in a concentrated mode, and the computer emits control instructions to the hydro-electric control systems so as to realize push construction synchronization. The 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

Images