Grouting pile hole detection is a commonly used foundation method for bridge structures, which has been widely used in engineering due to its high construction efficiency, large bearing capacity, and wide applicability. The drilling of cast-in-place piles is usually completed underground, so the quality is difficult to control, especially for ultra long drilled piles. How can we ensure the verticality of the drilling to ensure the quality of construction? Let's explore together with the editor.

1. Choose a drilling rig

Reasonably select the drilling rig based on the geological conditions of the pile location. During construction, two different types of drilling rigs can be used: one is a lightweight drilling rig with fast rotation speed of drill rods and high torque during drilling. One type is a heavy-duty drilling rig that can add counterweights at the drill bit for smoother drilling.

2. Control of verticality

can be adoptedinclinometerPerform verticality testing, assuming that the verticality of the drill rod is consistent with that of the borehole, measure the inclination of the drill rod point by point, and convert it to the verticality of the borehole using the equal angle full distance method. This method is limited by the detection principle, and the detection data is generally larger than the actual value, which also has a certain safety factor. Through the detection of verticality, it was found that the verticality control of the light drilling rig was better, while the verticality of the holes formed by the heavy drilling rig was poorer.

3. The influence of drilling rig factors

perpendicularityOne of the main reasons for the poor performance is that the grinding disc of the drilling rig is not level and the connection between the drill rods is not tight. Only by ensuring that the grinding disc is level can the drill rod be kept vertical and the possibility of deviation be reduced. The loose connection of drill rods can cause small angular deviations between them during drilling due to high drilling resistance, resulting in a deviation angle between the drill rods and the vertical direction, thereby causing a deviation in the verticality of the drilled pile. To solve this problem. Generally, when drilling to a depth of one drill rod, the verticality of the grinding disc and the connection of the drill rod should be checked once. It is necessary to inspect each bolt to ensure the levelness of the grinding disc during drilling.