Method for measuring the center of a flexible safety measuring pile casing
By setting a mounting bracket and base on the outside of the steel casing, combined with the stable support of the motor and electromagnetic block, the problems of low measurement accuracy and poor safety caused by the instability of the wooden scaffolding are solved, and efficient and safe pile center positioning is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- THE FIRST CONSTRUCTION COMPANY OF CCCC SECOND HARBOR ENGINEERING CO LTD
- Filing Date
- 2026-03-24
- Publication Date
- 2026-05-29
AI Technical Summary
In existing technologies, the instability of wooden or bamboo planks when measuring the center of cast-in-place pile casings leads to low measurement accuracy and poor safety, and the marks are difficult to preserve, affecting construction accuracy and safety.
The system employs a combination of components such as a mounting bracket, support platform, track slab, cantilever rod, and total station. By setting marking lines on the outside of the steel casing, installing the mounting bracket and base, and using a motor and electromagnetic block for stable support, the system works in conjunction with the total station to ensure the stability and accuracy of the measuring equipment.
It improved measurement accuracy, eliminated swaying errors, ensured operational safety, achieved rapid and accurate pile center positioning, and enhanced the reliability and safety of construction.
Smart Images
Figure CN122106077A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of engineering surveying technology, and in particular to a flexible and safe method for measuring the center of the casing of a cast-in-place pile. Background Technology
[0002] During pile foundation construction, surveyors need to stand on the casing of the cast-in-place pile with instruments or measuring aids to measure the pile center. Currently, the common practice for centering the casing is to place a wooden (or bamboo) plank on top of the casing, and the surveyor measures from this plank. However, the plank wobbles, causing instability and making it difficult to quickly center the measuring equipment. Furthermore, the legs of the measuring prism cannot be stably balanced and fixed, hindering accurate and rapid measurement of the pile center point. The existing measurement scheme has the following drawbacks: 1. Low measurement accuracy: Wooden / bamboo planks have poor rigidity and insufficient stability, making them prone to swaying when people stand on them, which makes it difficult for the measuring equipment to be accurately centered; at the same time, the measuring rod legs are difficult to fix stably, which directly causes significant errors in the measurement results and affects the accuracy of subsequent construction.
[0003] 2. Poor operational safety: The scaffolding is simply placed without any protective structure, making it easy for it to slip or fall. Surveyors are at risk of falling into the pile holes, which can easily cause fear and make it impossible to effectively guarantee operational safety.
[0004] 3. Difficulty in retaining markings: The scaffolding will bend and deform under the weight of personnel, and the deformation will return to normal after the personnel leave, making it impossible to accurately retain the markings of the center position of the pile, and lacking reliable reference for subsequent construction.
[0005] Chinese patent document CN 117702753 A describes a method for measuring the center deviation of a steel casing, but the measurement is relatively cumbersome. Chinese patent document CN 120083203 A describes a method for measuring and positioning a steel casing for long-span bridges, but it also has the above-mentioned problems and its use is flawed, so it needs to be improved. Summary of the Invention
[0006] This invention provides a flexible and safe method for measuring the center of the casing of a cast-in-place pile, solving the technical problems of unsafe measurement and low measurement efficiency.
[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A flexible and safe method for measuring the center of a cast-in-place pile casing includes the following steps: S1. At the construction site, clean the top and inner and outer sides of the steel casing. S2. Based on the outer diameter of the steel casing, divide the perimeter of the outer wall of the steel casing into equal parts and mark the corresponding points. S3. Install the corresponding card holder at the marked line position; S4. After taking each component out of the storage box, assemble the support platform, track plate, adjustment plate and cantilever rod respectively. S5. Adjust the position of the locking sleeve, top rod and base at the end of the cantilever pole, and then connect the base and the card seat; S6. Take measurements at the top of each base using a rangefinder, and adjust the distance from the base to the center axis of the support platform as needed; S7. Use a total station to measure the coordinates of the prisms on both sides of the top of the adjustment plate; S8. Compare the measurement results with the coordinates of the points to be laid out to obtain the alignment point of the drill hammer.
[0008] In the preferred embodiment, the installation steps of the card slot in S3 include: By aligning the wrench with the hexagonal head in the middle of the double-threaded rod, open the two pressure rods on both sides of the card seat; Lower the clamping seat from the top of the steel casing, and then insert the steel casing between the two clamping rods at the bottom of the clamping seat; Adjust the direction of rotation of the bidirectional threaded rod to change the distance between the rollers at the bottom of the two opposing pressure rods, ensuring that the two rollers are respectively in contact with the inner and outer sides of the steel casing; During the installation of the base, fine-tune the position of the card holder to ensure that each base is aligned and installed with the corresponding card holder; Continue adjusting the rotation direction of the bidirectional threaded rod, and lock the roller and steel casing using the lock nut.
[0009] In the preferred embodiment, the installation steps of the support platform in S4 include: Open the cover from the top of the support platform, and then install the power supply on the adapter plate at the bottom of the cover. Check the status of the motor in the middle of the adapter plate. After confirming the status, reinstall the cover plate onto the adapter plate. Ensure that the hole in the middle of the cover plate is accurately fitted onto the output shaft of the motor, and then fix the cover plate and the output shaft with nuts.
[0010] In the preferred embodiment, the installation steps of the track slab in S4 include: Release the locking pins on both sides of the two opposing first electromagnetic blocks on the top of the adapter plate; Install the two prisms on both sides of the adjustment plate; After the adjustment plate is aligned with the track plate by the slider at the bottom, the whole thing is moved to one side of the first electromagnetic block; Install the track plate and adjustment plate together into the slots inside the two first electromagnetic blocks, and reinstall the locking pins.
[0011] In the preferred embodiment, the installation steps of the cantilever in S4 include: Insert a spring into the docking hole at one end of the push rod, then pass one side of the push rod through the spring and align it with the docking hole; After passing the locking sleeve through the other side of the push rod, it is locked by the internal thread on the inside of the locking sleeve and the external thread on the outside of the push rod. Install the base on the side of the top rod closest to the lock sleeve. After installation, fix the base and the lock sleeve with the locking rod. Align the threaded end of the cantilever rod with the first fixing hole on the base of the support platform and screw it in to secure the entire assembly.
[0012] In the preferred embodiment, the adjustment steps for the locking sleeve, push rod, and base in S5 include: Adjust the distance between the boom and the locking sleeve according to the outer diameter of the steel casing, and change the relative position between the locking sleeve and the boom by rotating the locking sleeve. Measure the distance between the sealing plate at the end of the locking sleeve and the outer wall of the support platform using a measuring tape to ensure that the distance between the locking sleeve and the support platform on different cantilever rods is equal. Lift the support platform and cantilever rod together to the top of the steel casing, remove the locking rod from the first lug of the locking sleeve, and release the locking rod from the base and the locking sleeve; Pull the base to align the third through hole on the base with the mating rod on the card seat, insert it, and then fix it with a nut; Screw the locking rod back into the first lug of the lock sleeve and temporarily secure it.
[0013] In the preferred embodiment, in S6, a magnetic plate is provided on the top of the base, and a metal protrusion that cooperates with the magnetic plate is provided on the bottom of the rangefinder. The metal protrusion is placed into the groove of the magnetic plate, and the position of the base is measured by the rangefinder. Adjust the position of the locking rod to ensure that the distance between the base on different cantilever rods and the outer wall of the support platform meets the measurement requirements.
[0014] In the preferred embodiment, in S7, after the support platform and the cantilever rod are installed with the bracket on the steel casing through the locking sleeve, the top rod and the base, the motor is energized to ensure that the angle of the first electromagnetic block is fixed at this time. Then the first electromagnetic block is energized, and the position of the adjusting plate is fixed at this time. Then the second electromagnetic block is energized, and the position and angle of the two prisms on the adjusting plate are fixed at this time. The coordinates of the two prisms are measured by a total station.
[0015] In the preferred scheme, in S8, the measured coordinates of the two prisms are B(X1,Y1) and C(X2,Y2), respectively, and the design coordinates of the point to be laid out are known as A(X0,Y0). A is the vertex of the triangle. Calculate the lengths of the three sides of the virtual ABC from the left side. Then calculate the height ha between point A and the line connecting BC; Move the adjustment plate in the opposite direction of ha to move the BC line to a position where it is collinear with point A; Finally, rotate the support platform to align the BC line with the line of sight of the total station, thus completing the straight-line orientation.
[0016] In the preferred scheme, The distance between points B and C is a, the distance between points AC is b, and the distance between points AB is c; Calculate the half-perimeter, L is: L = (a + b + c) / 2 Calculate the area using Heron's formula:
[0017] Calculate the height ha using the triangle area formula: S=(a ha) / 2 Solving for the height ha, we get ha = 2S / a; During the movement of the adjustment plate, the motor, the first electromagnetic block, and the second electromagnetic block are energized and / or de-energized as needed. The operator adjusts the position by holding the adjustment plate on the outside of the steel casing.
[0018] The beneficial effects of this invention are as follows: Marking lines are set according to the outer diameter of the casing, then the card holder is installed at the marking lines. After checking the status of the support platform, the adjusting plate, track plate, and cantilever rod are installed on the support platform. Locking sleeves and top rods for extension adjustment are installed at the ends of the cantilever rods. A base corresponding to the card holder is installed on one side of the top rod. The overall installation is convenient and the locking is stable. It also solves the problem that the state of the springs in different cantilever rods may differ or even fail. This avoids the problem of deviation between the center of the support platform and the central axis of the casing caused by relying solely on the elastic force of the springs as the locking force during the positioning and indexing of the support platform. Furthermore, the length of different cantilever rods can be adjusted later as needed to ensure accurate measurement. The springs in this solution serve as the initial locking force, ensuring the stability of the device. The top rod will not wobble during movement. The overall structure is rigid, and after being fixed by the locking rod, the structure is stable, the operation is simple, and the measurement accuracy is high. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a construction illustration of the present invention. Figure 1 ; Figure 2 This is a construction illustration of the present invention. Figure 2 ; Figure 3 This is a construction illustration of the present invention. Figure 3 State 1; Figure 4 This is a construction illustration of the present invention. Figure 3 State 2; Figure 5 This is a construction illustration of the present invention. Figure 4 ; Figure 6 This is a construction illustration of the present invention. Figure 5 ; Figure 7 This is a construction illustration of the present invention. Figure 6 ; Figure 8 This is a construction illustration of the present invention. Figure 7 ; Figure 9 This is a construction illustration of the present invention. Figure 8 ; Figure 10 This is a schematic diagram of the measurement principle of the present invention; Figure 11 yes Figure 9 A top-down view; Figure 12 yes Figure 9 A frontal view diagram; Figure 13 This is a schematic diagram of the cantilever rod installation top rod and base of the present invention; Figure 14 yes Figure 13 Explosion illustration Figure 1 ; Figure 15 yes Figure 13 Explosion illustration Figure 2 ; Figure 16 yes Figure 13 A top-down view; Figure 17 yes Figure 16 Sectional view along axis AA; Figure 18 This is a schematic diagram of the overall structure of the card holder of the present invention; Figure 19 yes Figure 18 A frontal view diagram; Figure 20 yes Figure 18 Explosion illustration Figure 1 ; Figure 21 yes Figure 18 Explosion illustration Figure 2 .
[0020] In the diagram: 1. Steel casing; 2. Marking line; 3. Card seat; 301. Top plate; 302. Oval hole; 303. Clamping rod; 304. Connecting rod; 4. Support platform; 401. Chassis; 402. Adapter plate; 403. Cover plate; 404. First fixing hole; 405. Second fixing hole; 406. Plug; 407. Motor; 5. Output shaft; 501. Power supply; 6. First electromagnetic block; 7. Slot; 702. Locking pin; 8. Track plate; 9. Adjusting plate; 901. First support rod; 902. Second electromagnetic block; 903. Second support rod; 904. Slider; 10. Prism; 11. Hinge; 11. First rod body; 1101. Threaded head; 1102. Connecting hole; 1103. Stop hole; 1104. External thread; 1105. Third locking hole; 1106. Reflective retaining ring; 1107. Lock sleeve; 12. Cylinder body; 1201. Sealing plate; 1202. Through hole 1 203; First ear plate 1204; Internal thread 1205; Top rod 13; Contact rod 1301; Limiting ring 1302; Fourth through hole 1303; Base 14; Countersunk hole 1401; Horizontal plate 1402; First locking hole 1403; Second ear plate 1404; Second locking hole 1405; Third through hole 1406; Magnetic suction plate 1407; Round rod 1408; Groove 1409; Rangefinder 1 5; Screw 16; Spring 17; Locking rod 18; Screw 1801; Lock head 1802; Insert rod 1803; Pressure rod 19; Lock nut 1901; Sleeve 1902; Fixing plate 1903; First through hole 1904; Second through hole 1905; Second rod body 1906; Roller 1907; Groove 1908; Nut 20; Guide rod 21; Two-way threaded rod 22; Hexagonal head 2201. Detailed Implementation
[0021] Example 1 like Figure 1-12 A flexible and safe method for measuring the center of a cast-in-place pile casing includes the following steps: S1. At the construction site, clean the top inner and outer sides of the steel casing 1; S2. Based on the outer diameter of the steel casing 1, divide the perimeter of the outer wall of the steel casing 1 into equal parts and draw marking lines 2 at the corresponding locations. S3. Install the corresponding card holder 3 at the position of the marking line 2; S4. After taking each component out of the storage box, assemble the support platform 4, track plate 8, adjustment plate 9 and cantilever rod 11 respectively. S5. Adjust the positions of the locking sleeve 12, the top rod 13 and the base 14 at the end of the lifting rod 11, and then connect the base 14 and the card seat 3. S6. Measure the distance from the base 14 to the center axis of the support platform 4 using a rangefinder 15 at the top of each base 14, and adjust the distance as needed. S7. Use a total station to measure the coordinates of the prisms 10 on both sides of the top of the adjusting plate 9. S8. Compare the measurement results with the coordinates of the points to be laid out to obtain the alignment point of the drill hammer.
[0022] In traditional surveying, surveyors need to stand on the casing of the cast-in-place pile with instruments or surveying aids to measure the center of the pile. Currently, the common practice for locating the center of the casing is to place a wooden (or bamboo) plank on the top of the casing. The surveyor then takes measurements on the placed wooden (or bamboo) plank. However, the plank sways, causing instability and making it difficult to quickly center the measuring equipment. The legs of the measuring prism cannot be stably balanced and fixed, making it impossible to accurately and quickly measure the center point of the pile.
[0023] The previous method involved risks and low measurement accuracy. The accuracy of the center point of the measuring pile directly affected the subsequent drilling accuracy. By rotating the top of the support platform, the two prisms can be rotated in any direction to coincide with the line of sight of the total station, thus completing the straight-line orientation. During operation, there is no need for workers to work on top of the steel casing 1; they can operate from the ground. This eliminates swaying errors and is far superior to existing bamboo scaffolding methods. It also eliminates the risk of personnel falling into the pile hole, improving operational safety. The above device effectively solves the problems of slippage and instability that occur when using traditional wooden (or bamboo) scaffolding, protecting workers from the fear of falling into the mud in the pile hole, ensuring the safety and reliability of the measurement operation, and thus achieving more accurate and efficient measurement.
[0024] like Figure 18-21 In the preferred embodiment, the installation steps of the card slot 3 in S3 include: By aligning the wrench with the hexagonal head 2201 in the middle of the bidirectional threaded rod 22, the two pressure rods 19 on both sides of the card holder 3 are opened; Lower the clamping seat 3 from the top of the steel casing 1, and then insert the steel casing 1 between the two clamping rods 303 at the bottom of the clamping seat 3; Adjust the rotation direction of the bidirectional threaded rod 22 to change the distance between the rollers 1907 at the bottom of the two opposing pressure rods 19, so that the two rollers 1907 are respectively in contact with the inner and outer sides of the steel casing 1; During the installation of the base 14, the position of the card holder 3 is finely adjusted to ensure that each base 14 is aligned and installed with the corresponding card holder 3; Continue to adjust the rotation direction of the bidirectional threaded rod 22, and lock the roller 1907 and the steel casing 1 through the lock nut 1901.
[0025] The card holder 3 includes a top plate 301. Symmetrical oblong holes 302 are provided on both sides of the top plate 301. Pressure rods 19 on both sides pass through the oblong holes 302. The upper side of the pressure rods 19 is threaded to engage with lock nuts 1901 to lock them to the top plate 301. In use, lock nuts 1901 are provided on both sides of the oblong holes 302, maintaining a gap between the lock nuts 1901 and the top plate 301. A sleeve 1902 is fitted onto the upper part of the second rod body 1906 of the pressure rods 19. Fixing devices are provided on both sides of the sleeve 1902. Plate 1903 has a first through hole 1904 and a second through hole 1905 on both sides. The inner diameters of the first through hole 1904 and the second through hole 1905 are different, and their distances from the central axis of the pressure rod 19 are also different. A guide rod 21 is inserted into the first through hole 1904. When the fixed plate 1903 is perpendicular to the top rod 301, the outer wall of the guide rod 21 is in contact with the outer side of the pressure rod 19. That is, during the adjustment of the bidirectional threaded rod 22, the guide rod 21 always remains in contact with the pressure rod 19. This design improves overall stability and avoids shearing forces on the threads when the bidirectional threaded rod 22 rotates. The roller 1907 has multiple grooves 1908 on its exterior to ensure stability when in contact with the steel casing 1. Initially, the clamp 3 is installed at the marking line 2. However, due to the fact that the cross-section of the steel casing 1 cannot be perfectly circular during long-term use, and the marking line 2 also has some errors during manual drawing, the clamp 3 needs not be completely locked at this point. The angle between the cantilever rods 11 on the support platform 4 is fixed, so the position needs to be adjusted according to the installation of the cantilever rods 11. The roller 1907 can move around its own axis along the inner and outer sides of the casing 1. The multiple grooves 1901 reduce the friction of overall movement and prevent the roller 1907 from easily moving along the axis of the steel casing 1 in the height direction. The design is ingenious, with strong locking force. Furthermore, in the event of motor 5 failure, it can also function as a means of driving the support platform 4 to rotate, ensuring convenient measurement.
[0026] like Figure 3-5 In the preferred embodiment, the installation steps of the support platform 4 in S4 include: Open the cover plate 403 from the top of the support platform 4, and then install the power supply 6 on the adapter plate 402 at the bottom of the cover plate 403; Check the status of the motor 5 in the middle of the adapter plate 402. After confirming the status, reinstall the cover plate 403 onto the adapter plate 402. Ensure that the insertion hole 407 in the middle of the cover plate 403 is accurately fitted onto the output shaft 501 of the motor 5, and fix the cover plate 403 and the output shaft 501 with the nut 20.
[0027] A chassis 401 is provided at the lower part of the support platform 4. Multiple second fixing holes 405 are provided at the top of the chassis 401, and multiple plugs 406 are provided at the lower part of the adapter plate 402. The plugs 406 and the second fixing holes 405 are inserted into each other, making installation and removal convenient. The size of the chassis 401 and the adapter plate 402 can be adjusted as needed. At the same time, the chassis 401 and the adapter plate 402 are made of insulating materials, such as polytetrafluoroethylene, which ensures safety while being lightweight and having better stability in use.
[0028] like Figure 5 In the preferred embodiment, the installation steps of track plate 8 in S4 include: Release the locking pins 702 on both sides of the two opposing first electromagnetic blocks 7 at the top of the adapter plate 402; Install the two prisms 10 on both sides of the adjusting plate 9 respectively; After the adjusting plate 9 is aligned with the track plate 8 via the lower slider 904, the whole thing is moved to one side of the first electromagnetic block 7. Install the track plate 8 together with the adjustment plate 9 into the slots 701 inside the two first electromagnetic blocks 7, and reinstall the locking pins 702 in place.
[0029] The lower part of the adjusting plate 9 is connected to the first support rod 901 and the second electromagnetic block 902. The second electromagnetic block 902 is connected to the slider 904 via the second support rod 903. The first support rod 901, the second support rod 902 and the slider 904 on the adjusting plate 9 are made of insulating materials, such as polytetrafluoroethylene, which ensures safety and stability when working with the first electromagnetic block 7, and makes the overall use more convenient.
[0030] like Figure 13-17 In the preferred embodiment, the installation steps of the cantilever rod 11 in S4 include: Insert the spring 17 into the docking hole 1103 at one end of the push rod 11, and then insert one side of the push rod 13 through the spring 17 and into the docking hole 1103. After the locking sleeve 12 passes through the other side of the push rod 13, it is locked by the internal thread 1205 on the inside of the locking sleeve 12 and the external thread 1105 on the outside of the push rod 11. Install the base 14 on the side of the top rod 13 near the locking sleeve 12. After installation, fix the base 14 and the locking sleeve 12 with the locking rod 18. Align the threaded end 1102 of the cantilever rod 11 with the first fixing hole 404 on the base 401 of the support platform 4 and screw it in to fix the whole.
[0031] The lifting rod 11 includes a first rod body 1101, and a reflective retaining ring 1107 is provided at the end of the first rod body 1101. During the operation of the laser rangefinder 15, the reflective retaining ring 1107 is aligned, resulting in a fast measurement speed and high measurement accuracy, which improves the overall centering and positioning accuracy. At the same time, a stop hole 1104 is provided on one side of the docking hole 1103. A third locking hole 1106 that cooperates with the stop hole 1104 is provided through the first rod body 1101. The moved top rod 13 can be further locked by the screw 20, which improves the overall locking effect. That is, the position of the top rod 13 is fixed again with the locking rod 18, and the overall fixing force is stronger.
[0032] In the preferred embodiment, the adjustment steps for the locking sleeve 12, the push rod 13, and the base 14 in S5 include: According to the outer diameter of the steel casing 1, adjust the distance between the boom 11 and the locking sleeve 12, and change the relative position between the locking sleeve 12 and the boom 11 by rotating the locking sleeve 12. The distance between the sealing plate 1202 at the end of the locking sleeve 12 and the outer wall of the support platform 4 is measured with a tape measure to ensure that the distance between the locking sleeve 12 and the support platform 4 on different cantilever rods 11 is equal. Lift the support platform 4 and the cantilever rod 11 to the top of the steel casing 1 as a whole, remove the locking rod 18 from the first ear plate 1204 of the locking sleeve 12, and release the locking rod 18 from the base 14 and the locking sleeve 12. Pull the base 14 to align the third through hole 1406 on the base 14 with the docking rod 304 on the card seat 3, insert it, and then fix it with the nut 20; Screw 1801 of locking rod 18 back into first ear plate 1204 of locking sleeve 12 and temporarily fix it.
[0033] The locking sleeve 12 includes a cylindrical body 1201. The length of the cylindrical body 1201 is the range of movement and extension of the adjusting rod 11 that cooperates with the lifting rod 11. The sealing plate 1202 is provided with a through hole 1203. The rod passes through the through hole 1203. That is, each time the locking sleeve 12 is adjusted, the first ear plate 1204 needs to be kept in a horizontal state. That is, the minimum adjustment step is half of the pitch. This ensures that the third through hole 1406 on the base 14 can always be aligned with the docking rod 304 from above, ensuring quick and accurate installation.
[0034] A contact rod 1301 is provided on one side of the push rod 13. The contact rod 1301 extends into the stop hole 1104 of the lifting rod 11. A limit ring 1302 is provided on one side of the contact rod 1301. The limit ring 1302 is used to limit the push rod 13. The outer diameter of the limit ring 1302 is slightly smaller than the mating hole 1103, and the inner diameter of the stop hole 1104 is smaller than the mating hole 1103, thereby providing a stable working space for the spring 17. The spring 17 is divided into two sides. The push rod 13 is not pressed against the inner side of the limiting ring 1302 and the locking sleeve 12. A fourth through hole 1303 is provided on one side of the push rod 13, and a countersunk hole 1401 is provided on the base 14. The push rod 13 is inserted into the countersunk hole 1401. At the same time, a first locking hole 1403 is provided at the lower part of the countersunk hole 1401. The screw 20 passes through the first locking hole 1403 and the fourth through hole 1303. The screw 16 is threadedly connected to the first locking hole 1403. A horizontal plate 1402 is provided on one side of the base 14. A third through hole 1406 is provided on the horizontal plate 1402. The connecting rod 304 passes through the third through hole 1406 and is locked by the nut 20. A second ear plate 1404 is provided on the base 14 to cooperate with the first ear plate 1204. The locking rod 18 includes a screw 1801 and a lock head 1802. A plug rod 1803 is provided on the side near the lock head 1802. The plug rod 1803 and the lock head 1801 are located on both sides of the second ear plate 1404, respectively. The distance between the first ear plate 1204 and the second ear plate 1404 can be changed by moving the locking rod 18. The locking rod 18 is threadedly connected to the first ear plate 1204 and the second ear plate 1404 respectively. A second locking hole 1405 is provided on the top of the base 14. A round rod 1408 is provided at the lower part of the magnetic suction plate 1407. The round rod 1408 is inserted into the second locking hole 1405. The magnetic suction plate 1407 provides an installation platform for the rangefinder 15, ensuring stable and convenient installation.
[0035] In the preferred embodiment, in S6, a magnetic plate 1407 is provided on the top of the base 14, and a metal protrusion that cooperates with the magnetic plate 1407 is provided on the bottom of the rangefinder 15. The metal protrusion is placed into the groove 1409 of the magnetic plate 1407, and the position of the base 14 is measured by the rangefinder 15. Adjust the position of the locking rod 18 to ensure that the distance between the base 14 on different cantilever rods 11 and the outer wall of the support platform 4 meets the measurement requirements. In the initial state, ensure that the support platform 4 and the steel casing 1 are coaxial. Subsequently, it is necessary to move to the side of the known sampling point to change the position of the top rod locking sleeves 12 and 13 and the base 14 on different cantilever rods 11, so as to measure the actual center.
[0036] The groove 1409 is rectangular, which ensures that the laser emission direction is parallel to the axis of the boom 11 each time the rangefinder 15 is installed, resulting in high measurement accuracy and good performance.
[0037] Furthermore, the length of different booms can be adjusted later as needed to ensure measurement accuracy. In the preferred embodiment, in S7, after the support platform 4 and the cantilever rod 11 are installed with the bracket 3 on the steel casing 1 through the locking sleeve 12, the top rod 13 and the base 14, the motor 5 is energized to ensure that the angle of the first electromagnetic block 7 is fixed at this time. Then, the first electromagnetic block 7 is energized, and the position of the adjusting plate 9 is fixed at this time. Then, the second electromagnetic block 902 is energized, and the position and angle of the two prisms 10 on the adjusting plate 9 are fixed at this time. The coordinates of the two prisms 10 are measured by a total station.
[0038] Due to external forces affecting the construction site, such as wind interference, it is necessary to ensure that each component has the ability to resist external interference. Through the cooperation of the first electromagnetic block 7, the second electromagnetic block 902, and the motor 5, the position of the prism 10 is kept stable during measurement, without shaking or deflection, thus ensuring the overall measurement accuracy and efficiency.
[0039] In the preferred embodiment, in S8, the measured coordinates of the two prisms 10 are B(X1,Y1) and C(X2,Y2), respectively, and the design coordinates of the point to be laid out are known as A(X0,Y0). A is the vertex of the triangle. Calculate the lengths of the three sides of the virtual ABC from the left side. Then calculate the height ha between point A and the line connecting BC; Move the adjusting plate 9 in the opposite direction of ha to move the BC line to a position where it is collinear with point A; Finally, rotate support platform 4 to align the BC line with the line of sight of the total station, thus completing the straight-line orientation.
[0040] In the preferred scheme, The distance between points B and C is a, the distance between points AC is b, and the distance between points AB is c; Calculate the half-perimeter, L is: L = a + b + c / 2 Calculate the area using Heron's formula:
[0041] Calculate the height ha using the triangle area formula: S=a ha / 2 Solving for the height ha, we get ha = 2S / a; During the movement of the adjustment plate 9, the motor 5, the first electromagnetic block 7, and the second electromagnetic block 902 are energized and / or de-energized as needed. The operator adjusts the position by holding the adjustment plate 9 on the outside of the steel casing 1.
[0042] During initial setup, the support platform 4 is first adjusted to be coaxial with the steel casing 1. At this time, the relative positional relationship of the coordinates of the two prisms BC points can be viewed based on the known coordinates of the point to be laid out A. Then, the roller 1907 is adjusted to move along the steel casing 1 for initial adjustment. After locking, the measurement is repeated. Finally, fine adjustment is performed through the motor 5, the first electromagnetic block 7, and the adjusting plate 9 to ensure convenient measurement.
[0043] Since the coordinates of the point to be laid out at point A are known, the coordinates of the two prisms 10 can be accurately obtained by adjusting the working states of motor 5, first electromagnetic block 7 and second electromagnetic block 902, regardless of the installation position. At the same time, the adjustment plate 9 can be easily moved to achieve the effect of coplanarity between the adjustment plate 9 and the known point A. Then, based on the measurement value, after re-measurement, the position of the cantilever rod 11 is changed until the support platform 4 moves to point A. Finally, the motor 5 is rotated to adjust the alignment with the total station's viewing angle.
[0044] Motor 5 is a servo motor, capable of precisely rotating to the designed angle. A communication module is installed on the adapter plate 402, allowing operators to connect to it via a handheld terminal. The communication module uses a 5G network for signal transmission and reception. Battery 6 is connected to the controller via wires. The controller controls the start, stop, and forward / reverse rotation of motor 5. The communication module is also connected to the controller. When an operator operates the handheld terminal, the terminal sends a signal to the communication module, which then outputs the command to the controller. The controller then drives motor 5, causing the adapter plate 402 to rotate. Similarly, the first electromagnetic block 7 and the second electromagnetic block 902 are connected to the controller via wires, allowing control of the controller via the handheld terminal. This control allows for the on / off switching of power to the first electromagnetic block 7 and the second electromagnetic block 902. The overall operation is simple and effective.
[0045] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.
Claims
1. A flexible and safe method for measuring the center of a cast-in-place pile casing, characterized by: Includes the following steps: S1. At the construction site, clean the top inner and outer sides of the steel casing (1); S2. Based on the outer diameter of the steel casing (1), divide the perimeter of the outer side wall of the steel casing (1) into equal parts and draw marking lines (2) at the corresponding locations. S3. Install the corresponding card holder (3) at the position of the marking line (2); S4. After taking each component out of the storage box, assemble the support platform (4), track plate (8), adjustment plate (9) and cantilever rod (11) respectively. S5. Adjust the position of the locking sleeve (12), the top rod (13) and the base (14) at the end of the lifting rod (11), and then connect the base (14) and the card seat (3); S6. Measure the distance from the base (14) to the center axis of the support platform (4) by means of a rangefinder (15) at the top of each base (14) as needed; S7. Use a total station to measure the coordinates of the prisms (10) on both sides of the top of the adjustment plate (9); S8. Compare the measurement results with the coordinates of the points to be laid out to obtain the alignment point of the drill hammer.
2. The method for measuring the center of the cast-in-place pile casing according to claim 1, characterized in that: The installation steps for the card slot (3) in S3 include: By aligning the wrench with the hexagonal head (2201) in the middle of the double-threaded rod (22), open the two pressure rods (19) on both sides of the card holder (3); Lower the card holder (3) from the top of the steel casing (1), and then insert the steel casing (1) between the two clamps (303) at the bottom of the card holder (3); Adjust the direction of rotation of the double-threaded rod (22) to change the distance between the rollers (1907) at the bottom of the two opposing pressure rods (19) to ensure that the two rollers (1907) are respectively attached to the inner and outer sides of the steel casing (1); During the installation of the base (14), the position of the card holder (3) is finely adjusted to ensure that each base (14) is aligned with the corresponding card holder (3) during installation; Continue to adjust the rotation direction of the bidirectional threaded rod (22) and lock the roller (1907) and the steel casing (1) by using the lock nut (1901).
3. The method for measuring the center of the cast-in-place pile casing according to claim 1, characterized in that: The installation steps for the support platform (4) in S4 include: Open the cover plate (403) from the top of the support platform (4), and then install the power supply (6) on the adapter plate (402) under the cover plate (403). Check the status of the motor (5) in the middle of the adapter plate (402). After confirming the status, reinstall the cover plate (403) onto the adapter plate (402). Ensure that the insertion hole (407) in the middle of the cover plate (403) is accurately fitted onto the output shaft (501) of the motor (5), and fix the cover plate (403) and the output shaft (501) with nuts (20).
4. The method for measuring the center of the cast-in-place pile casing according to claim 3, characterized in that: The installation steps for the track slab (8) in S4 include: Release the locking pins (702) on both sides of the two opposing first electromagnetic blocks (7) on the top of the adapter plate (402). Install the two prisms (10) on both sides of the adjusting plate (9); After the adjustment plate (9) is aligned with the track plate (8) by the lower slider (904) and slid in, the whole thing is moved to one side of the first electromagnetic block (7); Install the track plate (8) together with the adjustment plate (9) into the slot (701) inside the two first electromagnetic blocks (7), and reinstall the locking pin (702) in place.
5. The method for measuring the center of the cast-in-place pile casing according to claim 4, characterized in that: The installation steps for the S4 center cantilever (11) include: Insert a spring (17) into the docking hole (1103) at one end of the push rod (11), and then insert the push rod (13) through the spring (17) and into the docking hole (1103). After passing the locking sleeve (12) through the other side of the top rod (13), it is locked by the internal thread (1205) on the inside of the locking sleeve (12) and the external thread (1105) on the outside of the lifting rod (11); Install the base (14) on the side of the top rod (13) close to the lock sleeve (12). After installation, fix the base (14) and the lock sleeve (12) with the lock rod (18). Align the threaded end (1102) of the lifting rod (11) with the first fixing hole (404) on the base (401) of the support platform (4) and screw it in to fix the whole.
6. The method for measuring the center of the cast-in-place pile casing according to claim 5, characterized in that: S5 The adjustment steps for the central locking sleeve (12), the push rod (13), and the base (14) include: According to the outer diameter of the steel casing (1), adjust the distance between the cantilever rod (11) and the locking sleeve (12), and change the relative position between the locking sleeve (12) and the cantilever rod (11) by rotating the locking sleeve (12); The distance between the sealing plate (1202) at the end of the lock sleeve (12) and the outer wall of the support platform (4) is measured by measuring tape to ensure that the distance between the lock sleeve (12) on different cantilever rods (11) and the support platform (4) is equal. Lift the support platform (4) and the cantilever rod (11) together to the top of the steel casing (1), remove the locking rod (18) from the first ear plate (1204) of the lock sleeve (12), and release the locking rod (18) from the base (14) and the lock sleeve (12); Pull the base (14) to align the third through hole (1406) on the base (14) with the connecting rod (304) on the card seat (3), insert it, and then fix it with the nut (20); Screw (1801) of the locking rod (18) back into the first ear plate (1204) of the locking sleeve (12) and fix it temporarily.
7. The method for measuring the center of the cast-in-place pile casing according to claim 5 is characterized in that: in S6, a magnetic plate (1407) is provided on the top of the base (14), and a metal protrusion that cooperates with the magnetic plate (1407) is provided on the bottom of the rangefinder (15). The metal protrusion is placed into the groove (1409) of the magnetic plate (1407), and the position of the base (14) is measured by the rangefinder (15). Adjust the position of the locking rod (18) to ensure that the distance between the base (14) on different lifting rods (11) and the outer wall of the support platform (4) meets the measurement requirements.
8. The method for measuring the center of the cast-in-place pile casing according to claim 1, characterized in that: in In S7, after the support platform (4) and the cantilever rod (11) are installed with the card seat (3) on the steel casing (1) through the locking sleeve (12), the top rod (13) and the base (14), the motor (5) is powered on to ensure that the angle of the first electromagnetic block (7) is fixed at this time. Then the first electromagnetic block (7) is powered on, and the position of the adjusting plate (9) is fixed at this time. Then the second electromagnetic block (902) is powered on, and the position and angle of the two prisms (10) on the adjusting plate (9) are fixed at this time. The coordinates of the two prisms (10) are measured by the total station.
9. The method for measuring the center of the cast-in-place pile casing according to claim 8, characterized in that: in In S8, the measured coordinates of the two prisms (10) are B(X1,Y1) and C(X2,Y2), respectively, and the design coordinates of the point to be laid out are known to be A(X0,Y0). A is the vertex of the triangle. Calculate the lengths of the three sides of the virtual ABC from the left side. Then calculate the height ha between point A and the line connecting BC; Move the adjustment plate (9) in the opposite direction of ha to move the BC line to a position collinear with point A; Finally, rotate the support platform (4) to align the BC line with the line of sight of the total station, thus completing the straight-line orientation.
10. The method for measuring the center of the cast-in-place pile casing according to claim 9, characterized in that: The distance between points B and C is a, the distance between points AC is b, and the distance between points AB is c; Calculate the half-perimeter, L is: L = (a + b + c) / 2 Calculate the area using Heron's formula: Calculate the height ha using the triangle area formula: S=(a ha) / 2 Solving for the height ha, we get ha = 2S / a. During the process of moving the adjustment plate (9), the motor (5), the first electromagnetic block (7) and the second electromagnetic block (902) are energized and / or de-energized as needed. The staff adjusts the position by holding the adjustment plate (9) on the outside of the steel casing (1).