How to deal with the sampling hole of pile foundation core drilling, and how to deal with the hole a

The fine stone concrete that is higher than the concrete elevation of the pile body is one grade and can be sealed and compacted.

Using pressure, from the bottom of the core hole to the top with epoxy resin or concrete cement slurry of the same grade to refill the seal. The borehole area accounts for less than 2% of the pile area, which will not affect the bearing capacity of the pile. The difference in geological conditions between the piles leads to the difference in bearing capacity much greater than the difference in pile area, and the outside of the reinforcement cage is only 5cm of protective layer, and the borehole is at least 10cm away from the reinforcement cage.

A deep foundation (see figure) composed of a pile and a pile cap connecting to the top of the pile (referred to as the cap) or a single pile foundation connected by a column and a pile foundation is referred to as a pile foundation. If the pile body is all buried in the soil, and the bottom surface of the cushion cap is in contact with the soil, it is called the low cushion cap pile foundation; If the upper part of the pile body is exposed to the ground and the bottom of the cushion cap is above the ground, it is called a high cushion cap pile foundation. Building pile foundations are usually low-cap pile foundations.

In high-rise buildings, pile foundations are widely used.

Testing technology: static load test.

The static load testing technology of pile foundation is developed with the increasing use of pile foundation in architectural design. After the founding of the People's Republic of China, the static load testing technology of pile foundation has been gradually developed. The traditional static load test is carried out by manual pressurization, manual operation and manual recording.

After the 80s of the 20th century, with the pace of reform and opening up, the scale of capital construction has increased year by year, especially the wide application of cast-in-place piles in engineering, and China's pile foundation static load testing technology has also entered a new period of development. So far, the pile foundation static load test has been established as a method, and it is theoretically an indisputable pile foundation detection technology.

Low-strain treatment.

In the 80s of the 20th century, the low-strain method based on the wave equation entered a period of rapid development, and various low-strain methods have achieved many valuable results in basic theory, mechanism, instrument research and development, field testing and signal processing technology, engineering pile and model pile verification research, and practical experience accumulation.

High strain applications.

The research on high strain dynamic pile test method in China began in the 80s of the 20th century.

In the late 90s, there are relevant software and hardware, the practical application effect has not been weaker than that of foreign countries, in the cast-in-place pile detection pile foundation dynamic measurement, domestic instruments and software have reached the international advanced level, some aspects show Chinese characteristics.

Acoustic transmission method.

The acoustic transmission method of concrete cast-in-place piles is developed on the basis of acoustic detection technology of structural concrete. By the 70s of the 20th century, acoustic transmission methods began to be used to test the integrity of concrete cast-in-place piles.

Drilling coring method.

In the 80s of the 20th century, the borehole coring method was mainly used for the detection of bored piles, and it was also used to detect the construction quality of underground diaphragm walls in areas with mature technical conditions. The core drilling method is a detection method for micro damage or local damage, which has the characteristics of science, intuitiveness and practicality.

The Technical Regulations for Testing Concrete Strength by Core Drilling Method require that the holes after core sampling should be repaired in time.

Generally, the methods of dealing with air agility are:

1. Using pressure, from the bottom of the core hole to the top with Changhao cement slurry backfilling.

2. If the drilling area accounts for less than 2% of the pile area, it will not affect the bearing capacity of the pile. Because the difference in geological conditions between the piles leads to the difference in bearing capacity is much greater than the difference in the pile area, in addition, there is a 5cm protective layer outside the reinforcement cage, so that the borehole will be at least 10cm away from the reinforcement cage, and this situation can also be left untreated.

Summary. 1. The basis is: "Technical Code for Building Pile Foundation Detection 106-2003".

2. How many meters do I need to continue to drill down to the pile end?

According to the specification: the number of core holes and the drilling position of each inspected pile should meet the following requirements:

3 .For the drilling of the bearing layer at the bottom of the pile, each inspected pile should not be less than one hole, and the drilling depth should meet the design requirements.

According to the purpose of the test (to detect the length of the cast-in-place pile, the concrete strength of the pile body, the thickness of the sediment at the bottom of the pile, to determine or identify the rock and soil properties at the bottom of the pile, and to determine the integrity category of the pile) is determined by the design. Among them, it is the longest when judging or identifying the rock and soil properties of the pile bottom. 

3. Hole treatment:

According to the specification: When the quality evaluation of the single pile meets the design requirements, the pressure should be used to refill and close with cement slurry from the bottom of the core hole; Otherwise, the core hole should be sealed and left for disposal.

4. Do rainproof measures in light rain and do not affect the detection.

How to deal with the drilling hole after the core drilling of the building foundation pile, and whether there are technical specifications.

1. The basis is: "Technical Specification for Building Pile Foundation Detection 106-2003" 2. How many m do you need to continue to drill down when drilling to the pile end? By specification:

The number of core holes and the drilling position of each inspected pile should meet the following requirements: 3For the drilling of the bearing layer at the bottom of the pile, each inspected pile should not be less than one hole, and the drilling depth should meet the design requirements.

According to the purpose of the test (to detect the length of the cast-in-place pile, the concrete strength of the pile body, the thickness of the sediment at the bottom of the pile, to determine or identify the rock and soil properties at the bottom of the pile, and to determine the integrity category of the pile) is determined by the design. Among them, it is the longest when judging or identifying the rock and soil properties of the pile bottom. 3. Hole treatment:

According to the specification: When the quality evaluation of the single pile meets the design requirements, the pressure should be used to refill and close with cement slurry from the bottom of the hole of the core hole; Otherwise, the core hole should be sealed and left for disposal. 4. Do rainproof measures in light rain and do not affect the detection.

Do you need to raise a grade with concrete core? No.

Legal Analysis:1The location of sampling should be determined according to the design unit;

2.The number of samples should be determined according to the partition of fracture injection or grouting, but each partition should not be less than 2 core samples;

3.The drilling method of the core sample should be driven by seam drilling, but the internal reinforcement should be avoided.

Legal basis: demolition of sheds;

Standardization Law of the People's Republic of China Article 2 The standards (including standard samples) mentioned in this law refer to the unified technical requirements of tourism bureaus in the fields of agriculture, industry, service industry and social undertakings.

Standards include national standards, industry standards, local standards, group standards, and enterprise standards. National standards are divided into mandatory standards and recommended standards, and industry standards and local standards are recommended standards.

Mandatory standards must be enforced. The State encourages the adoption of recommended standards.