How to inspect the hole of bored pile, and what is included in the hole detection of bored pile?

The test includes:

1) Aperture: On the recording diagram, the measured aperture is the deviation value between the design value and the recording paper.

The sum can also be read directly according to the scale on the figure. Based on this, we can know what the actual bore diameter is at any depth, which is an important parameter for judging the quality of the borehole.

2) Diameter reduction: From the overall view of the record drawing, the diameter reduction or expansion phenomenon of any part of the borehole can be clearly displayed. The curve has obvious indents when the diameter is reduced, and the curve is expanded when the diameter is reduced.

And we can know from the graph where there is a large expansion and contraction diameter phenomenon, so that we can take corresponding measures. This will be very useful in geology that is prone to hole collapse, and it is also another important parameter for judging the quality of boreholes.

3) Perpendicularity.

In the previous rebar cage hole detector inspection, it was simply not possible to check the verticality of the borehole with exact data due to the limited conditions. The standard of not more than 1% stipulated in the "Code for Design of Bridge Pile Foundation" can only be judged empirically. This is fully reflected in ultrasonic testing, where the actual verticality can be accurately calculated using the offset value of the borehole wall curve.

This alone reflects the advantages of ultrasonic testing, as verticality is an important parameter in determining the quality of the hole in the case of drilling.

Instruments and inspection contents of bored piles for hole inspection, BIM technology disclosure.

Drilling and pouring: refers to the use of drilling machinery to drill out of the pile hole, and pouring concrete in the hole (or first hoisting the reinforcement cage in the hole) to form a pile. According to whether the drill bit of the drilling machinery is constructed in the aquifer of the soil, it is divided into three methods: mud wall protection hole formation, dry operation hole formation and casing wall protection.

1) The construction process of the mud wall protection hole cast-in-place pile: site leveling, pile position pay-off, excavation slurry pool, slurry ditch, casing burial, drilling rig in place, hole position correction, hole formation, mud circulation, removal of waste slurry and mud slag, the first hole cleaning, quality acceptance, reinforcement cage and steel conduit, the second hole cleaning, pouring underwater concrete, pile.

2) Dry operation hole cast-in-place pile construction process: determine the pile position, drill holes, clear holes, and pour concrete under the reinforcement cage.

The content of the hole detection of bored piles generally includes hole diameter, verticality, collapse expansion and contraction diameter position and inclination direction, and some parts need to measure the thickness of cast-in-place pile sediment, which is mainly detected by ultrasonic hole forming slotting detector at present.

[Lu Guozhi].

Generally, it refers to: pore diameter, hole depth, verticality, and sediment thickness at the bottom of the hole.

Aperture, hole depth, verticality, sediment thickness at the bottom of the hole.

Mainly detect aperture, hole depth, verticality and other information, the current more advanced equipment is the ultrasonic hole quality detector, through the probe to emit sound waves in four directions, sound waves in the mud or air, reflected by the hole wall, received by the probe, the equipment through the reflection of sound waves to draw the hole diagram, and can calculate the aperture and verticality.

On-site inspection diagram.

For hole diagrams, please click to enter **Description.

After the hole is formed, there are generally three indicators of mud, hole diameter, hole depth, and the reinforcement cage must be detected before pouring, and the mud and hole depth are generally tested before pouring.

The first is to detect whether the hole depth reaches the design hole depth, detect the various indicators of the mud: mud specific gravity, sand content, viscosity, etc., after passing the hole detector to detect the hole type and aperture and so on, the reinforcement cage is completed and then the second hole is cleaned, and finally the hole depth is detected and the sediment thickness and the various indicators of the mud meet the requirements of pouring concrete.

Installation of the drilling machine.

If the foundation of the installation drilling machine is unstable, it is easy to produce adverse effects such as drilling machine tilt, pile tilt and pile eccentricity during construction, so it is required to install a stable foundation. For the foundation with soft stratum and slope, it can be bulldozed with a bulldozer, and then reinforced with steel plates or sleepers.

In order to prevent the pile position is not accurate, it is very important to set the center position and correctly install the drilling machine in the construction, for the drilling machine with the drilling tower, first use the power of the drilling rig to cooperate with the nearby ground cage, the drill pipe is moved and roughly positioned, and then the frame is jacked up with a jack, and the positioning is accurate, so that the card hole of the lifting pulley, drill bit or fixed drill pipe is on a perpendicular line with the center of the casing, so as to ensure the verticality of the drilling rig.

The first is to detect whether the hole depth reaches the design hole depth, detect the various indicators of the mud: mud specific gravity, sand content, viscosity, etc., after the party is qualified, use the probe to detect the hole type aperture and then carry out the second hole cleaning after the reinforcement cage, and finally detect the hole depth and ensure that the sediment thickness and the various indicators of the mud meet the requirements of pouring concrete.

If you are tilted, you should continue to sweep the hole, and if there is precipitation, continue to clean the hole.

Conventional control methods are enough, and those who don't have a shirt to be honest and believe in drilling the horns of the bull.

The depth of the final hole of the bored pile is measured by conventional methods: rope measurement + plumb hammer (or 200 steel bars about 20mm and 25mm long) can be measured, check the scale of the rope, the length can be pulled with a steel ruler of 50m, and don't let the workers on the pile foundation tie the rope into a slipknot.

Percussion drilling, punching and grabbing drilling and rotary drilling into holes can all be used mud wall protection construction method. The process of this construction method is:

Leveling the site, mud preparation, burying the casing, laying the working platform, installing the drilling rig and positioning, drilling into the hole, cleaning the hole and checking the quality of the hole, lowering the reinforcement cage, pouring underwater concrete, pulling out the casing, and checking the quality.

We can detect the pile, and the depth of the final hole is taken from the length of the drill pipe in the hole + the length of the drill bit, and the length of the drill bit is taken to 2 3 of the drill tip.

Example: Qi Xun guesses that the depth of the hole is 35 meters. The design pile length is 20m. The elevation of the top of the pile is. The elevation of the casing (measured high) is.

So speculated. Convert Changbei first. 35+ (This is the elevation of the bottom of the pile.)

The elevation of the pile bottom minus the elevation of the pile top can give the effective pile length of 28m.

1. According to the total length of the drilling tool is determined, the elevation of the machine or the ground is generally measured, the remaining foot of the drilling tool above the ground is measured, and the total length of the drilling tool is reduced by the remaining foot, that is, the length from the ground to the bottom of the hole, and whether the elevation of the bottom of the hole meets the design pile bottom elevation according to the ground elevation.

2. Before pouring or after the hole is cleaned, measure the length from the ground to the bottom of the hole with a measuring rope.

The depth measurement is to verify whether the elevation of the pile bottom is up to standard, so it is necessary to determine a fixed reference object on the ground or on the machine, and the position of the reference object can be determined together with the construction unit and the elevation can be measured. However, the depth of the hole in the data must be filled with the depth of the ground downward.