A Horizontal Displacement Monitoring and Control System of Anchor Base of Concrete Steel Tube Tied Arch Bridge

Abstract

The invention relates to the technical field of bridge construction, in particular to a system for monitoring and controlling the horizontal displacement of the abutment of a concrete-filled steel pipe tied arch bridge, which includes a tied arch bridge, a jack and a control device. The tied arch bridge includes a bridge body, tie bars and an abutment , the abutments are provided with two, and are respectively connected with the two ends of the bridge body, and the back side of the two abutments are provided with foot supports, and the tie rods slide through the two arches. seat, and both ends pass through the abutment and the foot support in turn, the tie rod is located between the support foot and the abutment, and an anchor is sleeved, and one end of the anchor is connected to the arch The seat is connected, and is used for the sliding connection of the tie rod; the jack is used for clamping and fixing the tie rod, and one end abuts against the support foot to control the horizontal displacement of the abutment; the control device For automatic control of the elongation of the jack. The invention can intervene in the horizontal displacement of the abutment in real time to ensure the safety of the tied arch bridge during construction.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a monitoring and control system for the horizontal displacement of the abutment of a concrete-filled steel tube tie-bar arch bridge. Background technique [0002] Under the action of vertical load, the arch foot of the arch bridge produces horizontal thrust, which can effectively reduce the bending moment on the arch rib section and ensure that the arch rib is under axial compression or small bias stress, so the spanning capacity of the arch bridge is relatively large. Strong, and can make full use of the pressure-bearing characteristics of materials such as stone, concrete, and concrete-filled steel tubes, but the excessive horizontal thrust of the arch foot has high requirements on the bearing capacity of the foundation. Generally, the cost of building thrust arch bridges in plain areas or on weak foundations For this reason, engineers proposed the concept of tied a...

AI Technical Summary

Problems solved by technology

[0003] During the construction of concrete-filled steel tube tied arch bridges, the arch base is generally built first, and then the steel pipe arch rib is hoisted. At this time, the load effect generated by the gravity of the steel tube arch rib is transmitted to the arch base, and a horizontal thrust is generated on the arch base, and cracks may appear in the tension area. Possibly, the concrete is poured after the steel pipe arch ribs are closed, the concrete is heavy, and the horizontal thrust on the abutment is very large. If no control measures are taken, the abutment will have a large horizontal displacement, exceeding the design requirements, and the abutment and the entire arch bridge will be affected. Security poses hidden dangers

[0004] In order to ensure that the horizontal displacement of the abutment meets the requirements, temporary tie rods are used to balance the horizontal thrust of the abutment during the current construction. However, the current adjustment method is passive and depends on manual experience. For example, after pouring a certain After rooting the concrete in the steel pipe, if the horizontal displacement of the abutment is found to exceed the limit, an adjustment of the tie rod force is performed, but it is obvious that this is only a remedial adjustment after the fact, because the horizontal displacement of the abutment may have exceeded the limit during the concrete pouring process. However, irreversible damage has been caused to the abutment. At the same time, because the abutment is difficult to accurately simulate, it is often difficult to accurately calculate the specific adjustment value of the tie rod force. This has the risk of adjusting too large or too small.

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