Self counter force balance loading test method of engineering pile bearing capacity

Abstract

The invention provides a method for ensuring the position of a load box and pile quality and effectively transmitting axial force, shearing force and bending moment in self counter force balance loading test of engineering pile bearing capacity. A built-in jack of the load box is connected with a top cover plate and a bottom cover plate through high strength bolts, without being affected for normal loading, and consequently the load box transmits certain bending moment. The periphery of the load box is provided with twisted steels that are mutually lapped together and protected by a telescopic pipe, and mudjacking and solid joints are conducted after test, so that a reinforcing cage achieves the effect of overall equivalent connection and bears great shearing force and bending moment. The load box and the reinforcing cage are connected by means of inside cutting, and the horizontal resistance of a pile is increased at the load box. The surrounding gap of the pile is mudjacked at the load box after test to keep the continuity and integrity of pile concrete and ensure the axial force transmission of the pile and the vertical bearing capacity. The bottom of the bottom cover plate of the load box is provided with a conical flow guide body in order to avoid mud and sediments remaining on the bottom of the bottom cover plate when the pile concrete passes through the load box in pouring and ensure the pile quality and test accuracy.

Description

technical field [0001] The invention relates to a method for testing the bearing capacity of engineering pile foundations of fixed buildings such as bridges, and is especially suitable for testing the foundation bearing capacity of bored piles and bored piles. The method of force self-reaction balance loading test. technical background [0002] With the rapid development of large-span structures in our country, a large number of pile foundations are used for structural foundations, and the pile foundations are developing towards long, deep, and general trends, and the bearing capacity of foundations is also increasing; the traditional static load test pile method is faced with large tonnage. Test piles have the disadvantages of high cost, large amount of engineering, and long construction period. For complex test piles on water, slopes, etc., the traditional static load test pile method is more difficult to meet. The force self-balancing test method came into being. In the...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of large-span structures in our country, a large number of pile foundations are used for structural foundations, and the pile foundations are developing towards long, deep, and general trends, and the bearing capacity of foundations is also increasing; the traditional static load test pile method is faced with large tonnage. Test piles have the disadvantages of high cost, large amount of engineering, and long construction period. For complex test piles on water, slopes, etc., the traditional static load test pile method is more difficult to meet. The force self-balancing test method came into being

In the prior art, the pile foundation bearing capacity self-balancing test method is only applied to test piles. For example, the utility model patent No. ZL200720088950. After the pile bearing capacity test is completed, the test pile is often discarded, and the load box as the loading device is also buried in the test pile and cannot be reused, causing a lot of waste. If the pile foundation bearing capacity can be directly self-balanced on the engineering pile Test method test, then can save a large amount of test pile pile cost; In the prior a

Images