Walking type pile testing machine

Abstract

The invention discloses a walking type pile testing machine. The walking type pile testing machine comprises a bearing platform. The two sides of the bearing platform extend outwards to be connected with long ship bearing beams. Oil cylinder bearings are supported between the long ship bearing beams and long ship walking trolleys. The long ship walking trolleys are movably supported on long ships. The two ends of the bearing platform are further connected with short ships. The walking type pile testing machine is characterized in that reference beam notches are formed in the inner sides of the short ships and are oppositely arranged; at least one adjustable bearing is arranged between the long ship bearing beams and the long ship walking trolleys; a lower strengthening plate is fixedly connected to the center part of a platform lower panel of the bearing platform; during work, the distance L of the inner sides of the two long ships ranges from 4.0 mm to 6.8 mm. According to the pile testing machine, automatic moving of an integral machine and a balance weight is achieved, and repeated building and hoisting are not needed; and meanwhile the walking type pile testing machine has the beneficial effects of being accurate in testing and detecting data and safe and convenient to operate.

Description

technical field [0001] The invention relates to a detection device for the static bearing capacity of pile foundations in construction engineering, in particular to a pile measuring machine capable of walking and moving for carrying out static load tests on foundation piles. Background technique [0002] The pile foundation is composed of foundation piles and caps connected to the top of the piles. The pile foundation is an important part of the main body of the structure, and its quality directly affects the overall safety of the building. Differences in various factors such as geological conditions, construction technology, construction management level, and foundation pile quality will affect the pile foundation quality and single pile bearing capacity. In order to ensure the quality of pile foundation engineering, it is necessary to carry out single pile bearing capacity testing or sampling testing on pile foundation engineering in actual projects, and single pile vertic...

AI Technical Summary

Problems solved by technology

However, many deficiencies were also shown in the actual static load pile test: First, the static pile driver always minimizes the opening size of the two longships in order to concentrate the pile static force and the fuselage to be reasonably stressed. However, the too small opening size of the long boat will inevitably cause the long boat to squeeze and disturb the soil around the foundation pile to be tested, which will cause the illusion of a temporary increase in the bearing capacity of the foundation pile, resulting in distortion of the static load capacity detection of the foundation pile

Secondly, the detection reference beam used to support and install the displacement sensor is located between the two short boats. The displacement sensor cannot accurately reflect the vertical displacement of the foundation pile

Furthermore, since the static load loaded on the foundation piles needs to be maintained for several hours to ten hours during the detection process, the load-bearing platform and the counterweight on it reach hundreds to hundreds of tons, and the supporting oil cylinders on the long ship are used for long-term and large-tonnage operations. Leakage will inevitably occur under heavy pressure. Once leakage occurs, it will affect the supporting force of the oil cylinder to the load-bearing platform, thereby affecting the static load applied to the top of the foundation pile, and ultimately affecting the accuracy of detection.

In addition, because the static load in the detection is concentrated in the center of the lower panel of the load-bearing platform, and the static load is relatively large, sometimes more than 100 tons, and the local rigidity of the load-bearing platform is insufficient, the panel will be generated under the action of a larger static load. Severe deformation will also affect the accuracy of detection data

Images