Single-line inertial navigation type dry and wet hole forming quality detection device and method

Abstract

The invention discloses a single-line inertial navigation type dry and wet hole forming quality detection device. A fluid density sensor and a plurality of special gas-liquid ultrasonic sensors are arranged in a probe of the device, a wire frame is erected at a pile hole opening, a take-up and pay-off reel, a depth counting pulley and a satellite positioning sensor are installed on the wire frame, the fluid density signal input end of a hole forming detection host is connected with the fluid density signal output end of the fluid density sensor, the hole forming detection host controls the special gas-liquid ultrasonic sensors to transmit ultrasonic signals, the special gas-liquid ultrasonic sensors transmit the reflected ultrasonic signals to the hole forming detection host, a cable bus is wound on the take-up and pay-off reel and controlled by the take-up and pay-off reel to take up and pay off wires, the depth counting pulley is used for recording the take-up and pay-off length of the cable bus, and the satellite positioning signal communication end of the satellite positioning sensor is connected with the satellite positioning signal communication end of the hole forming detection host. The device can detect dry holes and wet holes formed by cast-in-place piles or holes with one part dry and the other part wet.

Description

technical field [0001] The invention relates to the technical field of foundation pile engineering construction, in particular to a single-line inertial navigation type dry and wet hole forming quality detection device and method. Background technique [0002] Cast-in-situ pile is one of the commonly used foundation pile forms for buildings, which transfers the load of the superstructure to the deep and stable soil or rock layer. Reduce uneven settlement of foundations and buildings. The construction of cast-in-situ piles is divided into two parts: hole formation and pile formation, among which hole formation is the first link in the construction of cast-in-place piles. Because its operation process is completed underground and underwater, quality control is difficult, and complex geological conditions or mistakes in construction may cause problems such as hole collapse, diameter shrinkage, pile hole deflection, and excessive sediment. The quality of the holes directly aff...

AI Technical Summary

Problems solved by technology

Because its operation process is completed underground and underwater, quality control is difficult. Complex geological conditions or mistakes in construction may cause problems such as hole collapse, diameter shrinkage, pile hole deflection, and excessive sediment thickness.

The quality of the hole directly affects the quality of the pile after concrete pouring; the small diameter of the pile hole will reduce the side friction resistance of the pile, the bearing capacity of the pile tip, and the bearing capacity of the whole pile; The upper side resistance increases, but the lower side resistance cannot be fully exerted. At the same time, the concrete pouring amount of the single pile increases, and the cost increases; the deflection of the pile hole changes the vertical bearing and mechanical characteristics of the pile to a certain extent, and weakens the bearing capacity of the pile foundation. In addition, the inclination of the hole will easily lead to problems such as difficulty in hanging the reinforcement cage, collapse of the hole, and insufficient thickness of the reinforcement protection layer; too thick sediment at the bottom of the pile will reduce the pile length, and for end-bearing piles, it will directly affect the end bearing of the pile tip. ability

[0003] At the same time, due to the fact that there are many dry holes (no mud holes) when foundation piles are formed in the northwest and southwest regions, especially many foundation piles are formed with dry holes in the upper part for a long period of time and wet holes in the lower part. In this way, traditional wet holes Ultrasonic hole-forming detection of holes cannot be applied to the detection of dry holes or half of dry holes and half of wet pile holes, and other detection methods must be used for detection, which brings a lot of trouble and cost to the detection unit; therefore, a research It is particularly important to use a pore-forming detector that can detect the quality of pore-forming holes in both dry and wet holes

Images