First, the road and bridge pile foundation sound tube is easy to have problems in the laying of:
1. The bottom of the pile is the site where the defect is likely to occur. Due to improper construction, the acoustic tube at the bottom of the pile bends inward and the spacing becomes smaller, so that the transmitting and receiving transducers do not keep parallel. The ultrasonic pulse has an abnormally high sound velocity, and the amplitude of the ultrasonic wave decreases. The curve is not normal.
2. Insufficient ligating of the sounding tube or excessive spacing of the lashings. During the pouring of the concrete, the sounding tube is tilted or bent by the concrete extrusion, and the distance between the tubes becomes larger or smaller, which directly affects the analysis and determination of the test results. Even the pile integrity category cannot be given, and only drill cores or other reliable methods can be used to detect and affect normal construction.
3, due to the steel casing is too long, the welding quality is good, the air sealed inside can not be discharged, the sound wave signal must travel a long distance or through the air layer can be received, resulting in serious abnormal sound signal, affecting the pile body Integrity determination.
4. It is generally assumed that the transducer is located at the center of the sound tube. If the diameter of the sound tube is large, the transducer swings within the tube to increase the delay of the coupling water layer. This also affects the time of the sound wave propagation. Larger, the impact on the test results is greater.
Second, the relevant operating specifications of the sound and pipe test of the road and bridge pile foundation are:
1. For buried specifications, the buried depth of the sounding pipe shall be buried to the bottom of the cast-in-place pile, and the upper end shall be higher than the top surface of the cast-in-place pile by 300 mm to 500 mm. The exposed height of the sound pipe of the same pile shall be the same.
2. Sealing specification: The bottom of the sounding tube should be welded blind cover or steel plate to ensure that the seal does not leak the slurry; after the sounding tube is installed, the upper mouth should be capped or stoppered so as to avoid falling foreign objects when poured concrete, resulting in the hole Blocked.
3, fixed specifications, acoustic tube can be directly used spot welding or wire binding methods fixed on the inner side of the cage, the fixed point spacing is generally not more than 2 m, where the end of the sound tube and joints should be set fixed points. For parts without cages, the sound tube can be fixed with steel bars. In order to ensure that the acoustic tubes are parallel to each other, it is possible to spot weld the triangular steel frame supports between acoustic tubes.
4. The specification of connection shall be such that the reinforcement cage should be prevented from being distorted when the pile hole is placed, and the sound measurement tube is generally installed in stages along with the reinforcement cage. The sound tube with the bottom cover is fixed on the first section reinforcement cage, and the rest is temporarily fixed on the prepared reinforcement cage. When the reinforcement cage is under, the upper section of the sound tube is docked and then inserted. At the same time, the sound tube was tied to the reinforcement cage and it was done in order. The joints between each segment can be reverse screw sleeve interface or sleeve welding scheme. The reverse thread sleeve joint should adopt soft rubber seal ring. The sleeve can be connected with a steel sleeve of about 80 mm in length. Larger than the outer diameter of the sound tube, the two sound tubes are sheathed and the sleeve and the sound tube are welded together by electric welding. No matter what kind of joint program must ensure that the joint has sufficient strength to ensure that the sound tube will not be forced to bend off; under high hydrostatic pressure joints dense leak-free slurry, the interface wall should remain flat, there should be no welding slag , burrs, etc., so as not to interfere with the free movement of the transducer. If the sound tube needs to be cut off, it should be cut with a cutting machine. After cutting, the tube mouth is polished to eliminate the inner and outer burrs. It should not be broken by electric welding. When the reinforcing steel is welded, the welding liquid should be prevented from splashing on the tube or the joint.
5, water injection specifications, each buried section should be filled with clean water into the sound tube as a detection agent. Water can not directly use the river, especially in flood season river water content is high, to be used after purification treatment can be used for irrigation sound tube, to achieve the purpose of preventing the bottom of the sound tube. Before filling the underwater concrete of the pile, check the water level in the sound tube. If the water in the tube is not full, it should be filled.
6. Test specifications, the age of the pile foundation concrete can be tested after 14 days. Before testing, the pile head should be chiseled to the design elevation, and a 32 mm long steel bar with a length of about 20 cm should be used to make a hanging hammer to test whether the sounding pipe is smooth and fill the pipe with clean water.
1. The bottom of the pile is the site where the defect is likely to occur. Due to improper construction, the acoustic tube at the bottom of the pile bends inward and the spacing becomes smaller, so that the transmitting and receiving transducers do not keep parallel. The ultrasonic pulse has an abnormally high sound velocity, and the amplitude of the ultrasonic wave decreases. The curve is not normal.
2. Insufficient ligating of the sounding tube or excessive spacing of the lashings. During the pouring of the concrete, the sounding tube is tilted or bent by the concrete extrusion, and the distance between the tubes becomes larger or smaller, which directly affects the analysis and determination of the test results. Even the pile integrity category cannot be given, and only drill cores or other reliable methods can be used to detect and affect normal construction.
3, due to the steel casing is too long, the welding quality is good, the air sealed inside can not be discharged, the sound wave signal must travel a long distance or through the air layer can be received, resulting in serious abnormal sound signal, affecting the pile body Integrity determination.
4. It is generally assumed that the transducer is located at the center of the sound tube. If the diameter of the sound tube is large, the transducer swings within the tube to increase the delay of the coupling water layer. This also affects the time of the sound wave propagation. Larger, the impact on the test results is greater.
Second, the relevant operating specifications of the sound and pipe test of the road and bridge pile foundation are:
1. For buried specifications, the buried depth of the sounding pipe shall be buried to the bottom of the cast-in-place pile, and the upper end shall be higher than the top surface of the cast-in-place pile by 300 mm to 500 mm. The exposed height of the sound pipe of the same pile shall be the same.
2. Sealing specification: The bottom of the sounding tube should be welded blind cover or steel plate to ensure that the seal does not leak the slurry; after the sounding tube is installed, the upper mouth should be capped or stoppered so as to avoid falling foreign objects when poured concrete, resulting in the hole Blocked.
3, fixed specifications, acoustic tube can be directly used spot welding or wire binding methods fixed on the inner side of the cage, the fixed point spacing is generally not more than 2 m, where the end of the sound tube and joints should be set fixed points. For parts without cages, the sound tube can be fixed with steel bars. In order to ensure that the acoustic tubes are parallel to each other, it is possible to spot weld the triangular steel frame supports between acoustic tubes.
4. The specification of connection shall be such that the reinforcement cage should be prevented from being distorted when the pile hole is placed, and the sound measurement tube is generally installed in stages along with the reinforcement cage. The sound tube with the bottom cover is fixed on the first section reinforcement cage, and the rest is temporarily fixed on the prepared reinforcement cage. When the reinforcement cage is under, the upper section of the sound tube is docked and then inserted. At the same time, the sound tube was tied to the reinforcement cage and it was done in order. The joints between each segment can be reverse screw sleeve interface or sleeve welding scheme. The reverse thread sleeve joint should adopt soft rubber seal ring. The sleeve can be connected with a steel sleeve of about 80 mm in length. Larger than the outer diameter of the sound tube, the two sound tubes are sheathed and the sleeve and the sound tube are welded together by electric welding. No matter what kind of joint program must ensure that the joint has sufficient strength to ensure that the sound tube will not be forced to bend off; under high hydrostatic pressure joints dense leak-free slurry, the interface wall should remain flat, there should be no welding slag , burrs, etc., so as not to interfere with the free movement of the transducer. If the sound tube needs to be cut off, it should be cut with a cutting machine. After cutting, the tube mouth is polished to eliminate the inner and outer burrs. It should not be broken by electric welding. When the reinforcing steel is welded, the welding liquid should be prevented from splashing on the tube or the joint.
5, water injection specifications, each buried section should be filled with clean water into the sound tube as a detection agent. Water can not directly use the river, especially in flood season river water content is high, to be used after purification treatment can be used for irrigation sound tube, to achieve the purpose of preventing the bottom of the sound tube. Before filling the underwater concrete of the pile, check the water level in the sound tube. If the water in the tube is not full, it should be filled.
6. Test specifications, the age of the pile foundation concrete can be tested after 14 days. Before testing, the pile head should be chiseled to the design elevation, and a 32 mm long steel bar with a length of about 20 cm should be used to make a hanging hammer to test whether the sounding pipe is smooth and fill the pipe with clean water.
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