Use method of deep load test equipment in open caisson construction period

Abstract

The invention provides a use method of deep load test equipment in an open caisson construction period. The equipment comprises a counter-force device, a loading device, a displacement limiting device and a displacement measuring device. The method comprises the following steps of: arranging the displacement measuring device on the loading device; connecting the loading device with a second end of the counter-force device; arranging the displacement limiting device on the outer side wall of the counter-force device; extending the second end of the counter-force device into an open caisson test hole, and connecting a first end of the counter-force device with an open caisson main body structure; operating the loading device to test a test soil body in the open caisson test hole; and observing the displacement of the loading device in the vertical direction through the displacement measuring device. According to the use method, the real displacement of a bearing plate can be directly obtained, and test errors caused by test depth and deformation of the counter-force device are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of deep load tests, and in particular relates to a method for using deep load test equipment during caisson construction. Background technique [0002] With the development of transportation construction at home and abroad in recent years, the span of bridges has been continuously increasing, and the requirements for the bearing capacity and settlement of bridge foundations have also been continuously improved. As an important form of deep foundation, caisson foundation has the advantages of good integrity, high bearing capacity, high structural strength and small deformation, and is widely used in large bridges. In order to make it exert its bearing capacity, the caisson foundation needs to overcome the sinking resistance by taking soil from the well, and after continuous sinking and step-by-step elevation of the wellbore, the bottom sealing operation is carried out after reaching the design elevation. [...

AI Technical Summary

Problems solved by technology

However, under the existing technology, there is no feasible equipment for carrying out deep load tests during the construction period of the caisson, and other soil in-situ test equipment cannot test the soil near the foot of the caisson during the construction period of the caisson.

Existing deep load test equipment cannot be applied to load tests during caisson construction directly or through simple improvements. Therefore, it is impossible to obtain the ultimate bearing capacity and key mechanical parameters of the soil near the edge foot during caisson construction through field tests.

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