Inspection of concrete cast in place piles during construction

This is generally supervised and inspected, mainly to see the specific gravity of the mud, the thickness of the sediment, and the inclination of the hole. The specific gravity of the mud is controlled in order to not collapse the hole pile, and there will be no interlayer when pouring, and the design requirements are that the specific gravity of the mud is not greater, and the thickness of the sediment shall not be greater than 5 cm.

Whether the borehole is inclined, whether the borehole depth meets the design requirements, the position of the borehole pile, the hole diameter, the shape, and the soil quality of the bottom of the hole.

Directly in the form of **:

1. Measure the depth of the hole with a measuring rope, and 2. Measure the diameter of the hole with a hole gauge.

3. Look at the specific gravity of the mud, think of these at present, and then add it later.

By the way, there is also the thickness of the sediment.

After the pile foundation is formed, the inspection unit needs to check all the details to verify whether the bearing layer is in place, not a spot check, with specific reference to the "Code for Acceptance of Construction Quality of Building Foundation Engineering".

Simpler after the pile foundation is formed:

1. The number of tests according to the design requirements is generally in the notes or descriptions of the construction drawings of the pile foundation structure;

2, according to the actual situation and with reference to the "building pile detection technical specification JGJ106--2003" selection;

3. According to the above situation, prepare the pile foundation testing plan, report to the supervision and Party A for signature, and finally report to the quality supervision station for signature and approval.

Hole type detection Finding a testing unit requires a special instrument.

It is necessary to use an ultrasonic hole forming and slotting quality detector to detect the hole depth, hole diameter and verticality. The basic method is: the principle of ultrasonic ranging.

The most common and most common are small strains (which test the integrity of the pile).

I don't really know what you said about the glass on the top of the pile, I have seen that the fine sand is placed for leveling, so that it can be better to make the strain.

At the beginning of the project, it is necessary to do static load, which may be used for leveling, and the glass can be better observed for settlement!

It is necessary to do the slump test and mix ratio test of mortar.

At present, the commonly used pile foundation detection methods at home and abroad:

Core detection method: because the design load of large straight bored cast-in-place piles is generally large, there are many difficulties in using the static pile test method, so a geological drilling rig is commonly used to drill core samples along the length direction of the pile body, and the quality of the pile is determined through the observation and testing of the core samples.

But this method can only reflect a small part of the concrete quality within the scope of the borehole, and the equipment is huge, labor-intensive and time-consuming, expensive, not suitable as a large-area detection method, but can only be used for sampling inspection, generally sampling 3 5% of the total pile volume, or as a means of checking the results of non-destructive testing.

Vibration detection method: also known as dynamic measurement method. It is to apply an excitation force on the top of the pile by various methods to make the pile and the pile soil system vibrate.

Or a method to generate stress waves in the pile, through various analyses of fluctuations and fluctuation parameters, to infer the concrete quality and overall bearing capacity of the pile. There are four main methods of this kind, namely percussion method and hammering method, steady-state excitation mechanical impedance method, transient excitation mechanical impedance method, and hydroelectric effect method.

Ultrasonic pulse test method: This method is developed on the basis of detecting concrete defects. The method is to pre-embed several detection pipes in parallel to the length of the pile at the concrete pouring front of the pile, which serves as a channel for ultrasonic testing and receiving transducers.

During the detection, the probe moves synchronously in the two pipes, and the parameters of the ultrasonic pulse passing through the concrete on the cross-section are measured point by point along different depths, and the concrete quality on each section is analyzed according to the principle of ultrasonic defect detection.

Ray method: This method is a method based on the attenuation, absorption, scattering and other phenomena of radioisotope radiation in concrete. When the radiation passes through the concrete, the intensity of the ray recorded by the receiver changes due to the difference in the quality of the concrete or due to defects, and the quality of the pile is judged accordingly.

Summary. Hello, dear! After the cast-in-place pile concrete is poured and formed, it should usually be tested during the hardening period of the pile, that is, the time when the concrete reaches the design strength.

Hello, dear! After the cast-in-place pile concrete is poured and formed, it should usually be tested in the hardening period of the land-fired pile, that is, the time when the concrete reaches the design strength.

1. Cast-in-place pile is a form of pile foundation that swims into concrete in an underground injection bridge, which pours concrete into the borehole or digging pit by drilling or digging a pit to form a pile body. The strength, compactness and other physical properties of cast-in-place piles will directly affect the bearing capacity and stability of pile foundations. Therefore, in the pouring process of cast-in-place piles, it is necessary to strictly control the pouring quality of concrete, and test it after forming to ensure that the quality of the pile meets the design requirements.

2 Generally speaking, after the cast-in-place pile concrete is poured and formed, it needs to go through a period of curing to make the concrete fully hardened and reach the design strength. The curing period is generally 28 days, so testing should usually be done after this period. Specific testing methods include non-destructive testing and destructive testing, such as ultrasonic testing, core sampling testing, etc., to detect whether the quality and strength of the pile meet the design requirements.

3. In addition to the inspection of cast-in-place piles after concrete pouring and forming, quality control and testing should also be carried out in the construction process of cast-in-place piles. This includes monitoring the drilling and pouring process, such as testing and recording the quality of the borehole wall, the diameter of the borehole, the position and verticality of the pile, and the nature of the grout in the pouring process, so as to ensure that the quality of the cast-in-place pile meets the design requirements. In addition, in the process of cast-in-place piles, regular inspection and maintenance are also required to ensure the safety and reliability of the pile. Roger that.

Answer]: a, b, e

The concrete cast-in-place pile foundation should check whether the pile position deviation, the elevation of the pile top, the thickness of the sediment at the bottom of the pile, the integrity of the pile, the bearing capacity, the verticality, the pile diameter, the raw materials, the mix ratio and strength of the concrete and the soil mixture, the mud mix ratio and the performance index of the cavity acacia, the production and installation of the reinforcement cage, and the concrete pouring meet the design requirements and specifications. "Technical Code for Building Pile Foundation" (JGJ94--2008) stipulates that before pouring concrete, the center position, hole depth, hole diameter, verticality, and sediment thickness of the hole should be inspected in accordance with the construction quality requirements.

Answer] The old file is missing: a, b, e

This question assesses the quality inspection items of concrete cast-in-place piles. The concrete cast-in-place pile foundation should check whether the pile position deviation, pile top elevation, pile bottom sediment resistance thickness, pile integrity, bearing capacity, verticality, pile diameter, raw materials, concrete mix ratio and strength, mud mix ratio and performance indicators, steel cage production and installation, concrete pouring, etc. meet the design requirements and specifications. "Technical Code for Building Pile Foundation" JCJ94-2008 stipulates that before pouring concrete, the center position, hole depth, hole diameter, verticality, and sediment thickness of the hole should be inspected in accordance with the requirements of construction quality.