How to measure the allowable deviation of pile foundation?

There are two ways to measure pile position deviation. First, after the axis is popped up, the deviation distance can be measured with a steel ruler and the deviation direction can be indicated. Second, the pile position coordinates can be measured with a total station or GPS, and after the pile foundation diagram is extended, the pile position deviation is generated by comparing the measured position with the design position.

After measuring the data in the field, both can be programmed to draw as-built drawings of pile deviations. The demonstration is as follows:

The first is to quickly mark the plane deviation and elevation deviation data of the field quantity on the pile foundation diagram to generate the as-built drawing of the pile position deviation, which can generate the plane and elevation deviation at the same time, or only the plane deviation or elevation deviation can be generated.

The second way: after the actual measured pile coordinates in the field are displayed on the pile foundation diagram in batches, according to the measured pile position coordinates and the design pile position are compared, the pile position deviation completion drawing and table are generated and the field is generated, and the overrun deviation is marked.

The specific measurement method of the allowable deviation of the pile position of the pile foundation is to compare the measured actual pile position with the measured design pile position.

Measuring the deviation of the pile position is generally carried out after the earthwork excavation is completed, the pile head is qualified, the foundation cushion is done, and the axis of the foundation, the cushion cap line and the necessary foundation beam and foundation column are measured.

At this time, according to the axis on the foundation cushion, the distance between the design position of the pile (which has been measured and set when the pile is driven) and the actual pile position is measured again, and the deviation of the pile position is measured; Take the deviation value of the pile position.

A comparison with the allowable deviation value of the specification comes out.

There is not much difference between the measurement method of measuring the actual pile position and the measurement method of the design pile position, and there must be the axis control network and the elevation control network measured and set up when the building is located in the early stage around the foundation pit, and the theodolite is adopted.

The pile position can be accurately determined by adding a steel ruler; If using a total station.

The measurement results are more accurate.

The difference between the measured distance from the pile to the axis and the design distance is the pile position deviation, which can be measured from the outer wall of the pile to the axis and then add the radius of the pile. Take care to measure from the outer wall of the pile to the axis as perpendicular as possible. One pile should be measured in two directions.

What kind of pile is a pile? Is it a manual digging pile or a rotary digging pile? Also, what do you mean by bias? Elevation? Axis? Perpendicularity?

It depends on what kind of pile it is, and it is recommended that you look at the bridge and culvert construction specifications. It's basically all there.

The allowable range of precast pile position deviation depends on what type of precast pile you are using and what standard you are referring to, there are several situations:

The deviation of the pile position of the pile (prefabricated concrete pile, pre-tensioned prestressed pipe pile, steel pile) is driven (coded and pressed), and the difference between the distance between any two points in the horizontal direction and the design value is 50mm; The ratio of the distance between any two points in the horizontal direction to the design value - 10 +15%; The difference between the height and the design value between any two points in the vertical direction is -50 +100mm.

The deviation of the inclination of the inclined pile shall not be greater than 15 of the tangent value of the inclination angle (the angle between the longitudinal centerline of the inclined angle tie pile and the plumb line).

The allowable deviation of lofting of group piles should be 20mm, and the allowable deviation of lofting of single-row piles should be 10mm.

Allowable deviation or allowable value of penetration depth or elevation; The allowable deviation or allowable value of the horizontal position is 30mm in the direction of the x and y axes; 50mm in the x, y-axis directions of the group row; Diagonal beating X and Y axis directions are 40mm each; 60mm in the x, y-axis directions of the group row; The perpendicularity is clear and the allowable deviation or allowable value is not more than 1 150 in the direction of the x and y axesThe oblique x and y axis directions are not more than 1 100 each.

Key points of prefabricated pipe pile construction:

1.Before construction, Chi Zhengbury should carefully study the engineering geological data, design documents and construction organization plan, investigate the surrounding structures and pipelines, reasonably arrange the site, and plan the construction sequence and mechanical walking route. It is also necessary to inspect the appearance quality of the finished pile, the welding rod used for the pile, the pile sinking and other materials and equipment.

2.During the construction process, it is necessary to follow the steps of measuring pay-off positioning, pile driver positioning, pile driver counterweight, feeding the pile to the front of the pile driver, installing the pile tip, lifting the pile by the crane, adjusting the pile position, adjusting the verticality, applying pressure, and connecting the pile. Attention should be paid to controlling deviations in penetration depth or elevation, horizontal position and verticality, as well as measuring penetration and bearing capacity.

3.After construction, the static load test and dynamic penetration test should be carried out to test the bearing performance and integrity of the prestressed pipe pile. It is also necessary to protect the prestressed pipe pile after driving to prevent the vehicle from colliding or crushing. <>

What is the position deviation of cast-in-place piles? What is the allowable deviation range?

Dear, I'm glad to answer for you. What is the position deviation of cast-in-place piles? What is the allowable deviation range?

Answer: The deviation of a single row of piles should not be greater than 5 cm. The foundation of the pile group is not more than 10 cm, if there is an excess of the deviation, it can be handled by the method of connecting the pile, and the value can be adjusted by 1% according to the work.

Theoretically, if the pile deviates by 9 cm, drive 9 meters down at the elevation of the design pile top, correct the steel bar and re-pour it into a pile. Due to the advantages of no vibration, no soil compaction, low noise, and suitable for the use of lead in dense areas of urban buildings, cast-in-place piles have been widely used in construction. According to the different hole-forming processes, cast-in-place piles can be divided into cast-in-place piles with dry operation holes, cast-in-place piles with mud wall protection and cast-in-place piles with manual holes.

The aperture is not less than the design specification. 0 holes deep 500Pile position 50

Vertical pile verticality l 100(l is the length of the pile) and the thickness of the precipitation is the diameter of the pile). I hope I can help you!