Self-walking prepressing device suitable for cast-in-place beam supports and prepressing method of self-walking prepressing device

Abstract

The invention discloses a self-walking prepressing device suitable for cast-in-place beam supports and a prepressing method of the self-walking prepressing device. The self-walking prepressing devicecomprises a counterforce beam support with a cuboid frame structure, a walking system, a pressure system, a load distributing system, a locking system and a control system. The walking system and thepressure system are fixedly connected to the bottom end of the counterforce beam support, the load distributing system is connected to the pressure system, the locking system is used for positioning the counterforce beam support, and the control system is used for controlling the walking system to walk and controlling the pressure system to drive the load distributing system to carry out prepressing at different load grades. The prepressing device for the cast-in-place beam supports can automatically walk, the cast-in-place supports can be automatically classified, loaded and prepressed, prepressing block or water bag prepressing is not needed, manpower and material resources can be greatly saved, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a self-propelled preloading device and a preloading method suitable for cast-in-place beam supports. Background technique [0002] With the continuous update of bridge construction technology, the construction technology of cast-in-place beams is also constantly changing, and cast-in-place beams usually require cast-in-place supports to be erected between two bridge piers. In order to ensure that the cast-in-place support meets the construction requirements, it is necessary to preload the cast-in-place support to detect the stability of the support and eliminate the inelastic deformation of the support. The parameters that need to be adjusted are obtained through preloading to ensure that the deformation of the bracket during concrete pouring is always kept within the allowable range. [0003] At present, the traditional support preloading methods are two ways: heap load prelo...

AI Technical Summary

Problems solved by technology

[0004] Stacking preloading is to preload the bracket by stacking preloaded blocks (or sandbags) on the formwork. Although the effect of bracket preloading is achieved in this way, there are the following problems: (1), hoisting the preloaded block before and after preloading ( or sandbags) The construction period is long: due to the large number of pre-pressed blocks (or sandbags), it needs to be hoisted in many times, and the hoisting time is long, which prolongs the construction period

(2) Inconvenient transfer and high labor cost: When pouring the next beam section, the pre-pressed blocks on the beam section that have been pre-compressed must be transferred to the next beam section, and the transfer of the pre-pressed blocks (or sandbags) is very inconvenient. Increased construction time and labor costs

(3) The load classification is uncontrollable: the support needs to be preloaded in stages, and the preloading is carried out according to 60%, 80%, and 100% of the overall load. Due to the construction conditions, the preloaded blocks (or sandbags) may be inaccurate or impossible to classify The case of graded preloading

(4) Inconvenient adjustment: when preloading blocks (or sandbags), the bottom mold and side molds of cast-in-place beams must be installed first before loading. If the bracket needs to be strengthened or adjusted during the preloading process, then It will affect the flatness of the formwork and even need to reinstall the formwork

(5) Serious waste of materials: Most of the pre-pressed blocks (or sandbags) in the traditional technology cannot be transferred to the next construction site, resulting in a large amount of waste of materials

The following problems also exist in the water bag preloading: (1) The water bag preloading is greatly affected by the water supply conditions at the construction site, and it is difficult to use this method for preloading when the water source is far away

(2) Due to the large difference in specific gravity between water and reinforced concrete, it is difficult to accurately simulate the load according to the actual construction load distribution

(3) Serious waste of water resources

Images