Positioning method for inclined pile torsion angle in land pile sinking

Abstract

The invention discloses a method for positioning a torsion angle of an inclined pile in land pile sinking, which comprises the following steps of: firstly, manufacturing a positioning device of the torsion angle of the inclined pile, and welding two steel bars into a T shape with one as a transverse axis and the other as a longitudinal axis; then lofting a pile center coordinate at a designed elevation on a mud surface, marking, measuring a mud surface elevation at a pile position, calculating a center coordinate of an inclined pile at the mud surface according to the mud surface elevation, lofting on site, marking, and enabling a longitudinal axis of a positioning device to coincide with the centers of two lofting points; the transverse shaft of the pile driver front support frame is parallel to the transverse shaft of the positioning device; the inclined pile driving frame is adjusted to the designed inclined slope, the pile driving frame is moved in parallel, the center of the pile is aligned with the pile position point of the lofting mud surface elevation, and the method can guarantee the precision while facilitating positioning and improve the construction speed and the working efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of pile foundation quality detection, and in particular relates to a method for positioning the torsion angle of an inclined pile in onshore pile driving. Background Art

[0002] During pile foundation construction, since the pile top design elevation is 2 to 5 meters below the mud surface, the inclined pile design position cannot be directly staked out on the mud surface. It can only be staked out by measuring the mud surface elevation, calculating the pile position coordinates at the mud surface elevation, and then staked out by GNSS or theodolite. The inclination slope can be controlled by a level ruler, and the elevation can be controlled by a level. However, there is no reference for the torsion angle, so the pile position axis can only be staked out, and then translated to the extension line of the outer edge line on the left or right side of the pile driver, and a flower rod is inserted for the pile driver to adjust the torsion angle, which is time-consuming and labor-intensive, and thus causes great trouble to the smooth progress of pile sinking. Therefore, for such situations, it is necessary to develop a positioning technology for the torsion angle of inclined piles in onshore pile sinking. Summary of the invention

[0003] In order to solve the above problems, the present invention discloses a method for positioning the torsion angle of inclined piles in onshore pile driving, which has a simple structure and is easy to operate. It can directly and simply adjust the torsion angle of the pile position quickly and improve the construction speed.

[0004] To achieve the above object, the technical solution of the present invention is as follows: A method for positioning the torsion angle of an inclined pile in pile driving on land comprises the following steps: (1) Make a positioning device for the torsion angle of inclined piles. Find two steel bars and weld them into a T shape, one for the horizontal axis and the other for the vertical axis; (2) Locate the center coordinates of the pile at the design elevation on the mud surface and mark them. Then measure the mud surface elevation at the pile position. Calculate the center coordinates of the inclined pile at the mud surface based on the mud surface elevation and loft them on site and mark them. (3) Align the longitudinal axis of the positioning device with the centers of the two stakeout points; (4) The horizontal axis of the front support frame of the pile driver is parallel to and close to the horizontal axis of the positioning device; (5) Adjust the pile driver, tilt the pile frame to the designed inclination slope, and move the pile frame parallel to align the center of the pile with the pile position at the measured mud surface elevation. At this time, the designed position, inclination slope and torsion angle of the pile all meet the requirements.

[0005] As a supplement to the present invention, the steel bar in step (1) is 1200 mm long and Φ12 mm in diameter.

[0006] As a supplement to the present invention, the two sides of the positioning device in step (1) are fixed with diagonal braces.

[0007] As a supplement to the present invention, the setting out in step (2) is to use GNSS-RTK to set out the pile torsion angle direction line.

[0008] As a supplement to the present invention, after the positioning in step (5) is completed, pile driving is started, and re-measurement is performed after the pile driving is completed.

[0009] As a supplement to the present invention, a level ruler is used to check the inclination slope during re-measurement.

[0010] The beneficial effects of the present invention are: (1) The positioning device is small in size, low in cost, and the materials can be directly used on site, making it easy to manufacture; (2) The positioning method of the present invention is convenient for positioning and has a strong visual sense, and can allow the pile driver operator to directly and simply quickly adjust the pile position torsion angle; (3) Use GNSS or theodolite for layout, with small error and high accuracy; (4) This method can ensure accuracy while facilitating positioning, thereby improving construction speed and work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a working schematic diagram of the positioning device described in the present invention.

[0012] Figure 2 This is the survey and layout diagram of the pile locations. DETAILED DESCRIPTION

[0013] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0014] The method for positioning the torsion angle of an inclined pile in pile driving on land described in the present invention comprises a pile driver system, a GNSS system, a theodolite, a level, and a positioning device for the torsion angle of an inclined pile, wherein the positioning device for the torsion angle of an inclined pile uses two steel bars with a length of 1200 mm and a diameter of Φ12 mm, one of which is vertically welded to the center point of the other, one of which is a horizontal axis and the other is a vertical axis, and diagonal braces are added on both sides to fix it, such as Figure 1 shown.

[0015] According to the on-site conditions, the position where the piles need to be sunk is measured and positioned in a plane. Since the design elevation of the pile top is 2 to 5 meters below the mud surface, a GNSS reference station is first deployed on the control point. Because the design elevation of the pile top is lower than the mud surface, the vertical pile is not affected by the elevation when it is staked out, but the inclined pile has an inclination slope and a torsion angle when it is designed. If it is staked out according to the on-site mud surface elevation, the difference will be large. The elevation of the pile top in this area is basically 2 to 5 meters below the mud surface. When staking out, first use GNSS-RTK to lay out the design position of the inclined pile on the mud surface, mark it, and then measure the mud surface elevation. According to the measured mud surface elevation, the designed inclination slope and torsion angle, the actual coordinates of this mud surface are calculated and laid out on the ground. The pile position should be marked; the longitudinal axis of the positioning device should be aligned with the center of the two set-out points. According to the horizontal axis of the positioning device, the pile driver should be adjusted so that the horizontal axis of the front support frame of the pile driver is parallel to the horizontal axis of the positioning device. The rear tilted pile driver should be adjusted to the designed inclined slope. The pile driver should be moved parallel to align the center of the pile with the pile position at the set-out mud surface elevation. This method can quickly locate the inclined pile. To ensure the correct inclination and torsion angle of the pile, the inclination slope should be checked with a level ruler. The torsion angle direction line of the pile should be released on the left line with GNSS-RTK. After checking, the pile should be sunk. When the sunk pile is close to the designed pile top elevation, the pile top elevation should be controlled with a level and the hammer should be stopped. After the pile is sunk, the soil around the pile should be excavated and the sunk pile should be checked. The pile position and elevation are within the specification. Through the test pile sinking, the oblique piles with any torsion angle in a large range in this area can be positioned according to this method to ensure quality, meet the specifications and design requirements, and save time and effort.

[0016] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A method for locating the torsion angle of inclined piles in onshore pile driving, characterized by: The following steps are involved: (1) Make a positioning device for the torsion angle of inclined piles. Find two steel bars and weld them into a T shape, one for the horizontal axis and the other for the vertical axis; (2) Locate the center coordinates of the pile at the design elevation on the mud surface and mark them. Then measure the mud surface elevation at the pile position. Calculate the center coordinates of the inclined pile at the mud surface based on the mud surface elevation and loft them on site and mark them. (3) Align the longitudinal axis of the positioning device with the centers of the two stakeout points; (4) The horizontal axis of the front support frame of the pile driver is parallel to and close to the horizontal axis of the positioning device; (5) Adjust the pile driver, tilt the pile frame to the designed inclination slope, and move the pile frame parallel to the pile center so that the pile position at the measured mud surface elevation is aligned. At this time, the designed position, inclination slope and torsion angle of the pile all meet the requirements.

2. A method for locating the torsion angle of inclined piles in onshore pile driving according to claim 1, characterized in that: The steel bar in step (1) is 1200 mm long and Φ12 mm in diameter.

3. The method for locating the torsion angle of inclined piles in onshore pile driving according to claim 1, characterized in that: The two sides of the positioning device in step (1) are fixed with diagonal braces.

4. A method for locating the torsion angle of inclined piles in onshore pile driving according to claim 1, characterized in that: Step (2) is to use GNSS-RTK to release the pile torsion angle direction line.

5. The method for locating the torsion angle of inclined piles in onshore pile driving according to claim 1, characterized in that: Step (5) After positioning is completed, pile sinking begins, and re-measurement is performed after pile sinking is completed.

6. A method for positioning the torsion angle of inclined piles in onshore pile driving according to claim 5, characterized in that: When re-measuring, use a level to check the inclination slope.

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