Annular load box for self-balance method

Abstract

The invention discloses an annular load box for a self-balance method. The annular load box comprises an upper annular steel plate, a lower annular steel plate, an outer ring baffle, an inner ring baffle and a pressure device. The pressure device comprises a plurality of annular oil cavity expansion units which are overlapped in an up-and-down mode and communicate with one another, the annular oil cavity expansion unit located at the uppermost position is connected with the upper annular steel plate and can be connected with a hydraulic loading device, and the annular oil cavity expansion unit located at the lowermost position is connected with the lower annular steel plate; an outer annular filling cavity is formed among the upper annular steel plate, the lower annular steel plate, the outer ring baffle and the pressure device, and an inner annular filling cavity is formed among the upper annular steel plate, the lower annular steel plate, the inner ring baffle and the pressure device; the load box is further provided with a grouting valve block, the grouting valve block is provided with a grouting opening, a pipe cavity, a first grout outlet and a second grout outlet, the grouting opening, the pipe cavity, the first grout outlet and the second grout outlet are mutually conductive, and the first grout outlet and the second grout outlet communicate with the outer annular filling cavity and the inner annular filling cavity separately. The annular load box has the advantages that cost is saved, and meanwhile detection stability is guaranteed.

Description

technical field [0001] The invention relates to a ring-shaped load box for a self-balancing method. Background technique [0002] Self-balancing test technology is a new type of test technology for foundation bearing capacity that has been rapidly developed and promoted at home and abroad in recent years. It can effectively solve problems that are difficult to solve by traditional test methods, such as test piles on water, test piles on narrow and long sites, and large-diameter deep and long grouting. Pile bearing capacity testing and other engineering technical problems, and is favored by the engineering community for its time-saving, economical, and technologically advanced advantages. Different from the stacking method and the anchor pile method, the self-balancing method sets the loading device at the bottom or middle and lower parts of the foundation, so that the upper and lower parts of the foundation act as a counter force system, so that it is not limited by the site...

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Problems solved by technology

However, in this technical solution, there are still defects: 1. The effective area of ​​the oil cylinder is small, and the working pressure of the load box is high under the same bearing capacity. When the pressure of the contact surface is greater than or close to the concrete strength at that time, it is easy to cause the contact surface The concrete is broken, resulting in false displacement; 2. The overall height of the technical solution is high, and the grouting space is large after the inspection is completed, and the grouting effect is unstable

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