A device for measuring the diameter of a bored pile hole for road construction

Abstract

The present application relates to the technical field of drilling of soil or rock, and discloses a highway construction cast-in-place pile hole diameter measuring device, aiming to solve the problem of low measuring efficiency caused by full-process measuring and large contact pressure of the existing mechanical contact measuring technology, the device comprises a retracting and releasing mechanism, a retracting and releasing rope, an adjusting assembly and a measuring mechanism, the adjusting assembly realizes guiding and positioning through a counterweight column, an adjusting sleeve, a fixing sleeve and a vertical rod, the measuring mechanism is internally provided with a contact measuring assembly, a triggering assembly and a rotary adjusting assembly, when the hole diameter is within a standard range, the measuring arm drives the device to quickly fall with low contact pressure; when the hole diameter is out of range, the triggering assembly drives the vertical rod to expand and decelerate, and at the same time, a displacement sensor accurately collects data; and the rotary adjusting assembly can drive the measuring arm to rotate by 90 degrees, avoiding measurement misjudgment, and can realize efficient screening, accurate measurement and misjudgment avoidance, shorten the detection period and reduce operation and maintenance costs, and is suitable for highway cast-in-place pile hole quality detection.

Description

Technical Field

[0001] This invention relates to the field of drilling technology for soil or rock, and more particularly to a borehole diameter measuring device for bored piles used in highway construction. Background Technology

[0002] Drilling of soil or rock refers to the process in foundation engineering construction such as highways and buildings, where a drilling rig drives a drill bit to break up and cut the soil or rock below the ground surface, removing debris to form a hole of predetermined diameter and depth. This process is a core preliminary step in the construction of bored piles. Hole diameter measurement is crucial in highway construction of bored piles because the drilling process is prone to problems such as hole necking, enlargement, or irregular hole shape due to factors like uneven soil hardness, drilling rig verticality deviation, and poor mud performance. These problems directly affect the smooth placement and positioning of the subsequent reinforcement cage, reduce the bond strength between the pile and the surrounding soil, leading to insufficient pile bearing capacity, excessive settlement, and ultimately endangering the structural stability and long-term service safety of highway bridges and other structures. Therefore, hole diameter measurement is a key quality control method to ensure the quality of bored pile construction and verify whether the hole meets design requirements.

[0003] Existing technologies using mechanical contact measuring mechanisms to measure the diameter of pile holes typically measure the diameter of the entire pile hole from top to bottom. This requires the measuring arm to maintain a large contact pressure with the inner wall of the pile hole at all times to ensure stable contact and measurement even when the pile hole diameter is large. However, in actual highway construction, there is a standard range for the diameter of pile holes. Piles within the standard diameter range can be used normally without rework. In this case, existing technologies that measure the diameter of the entire pile hole and maintain a large contact pressure at all times will affect the speed at which the measuring mechanism falls into the pile hole, thus increasing the time cost of the entire measurement process. Summary of the Invention

[0004] The technical problem this invention aims to solve is that in actual construction, it is only necessary to determine whether the hole diameter is within the standard range, without the need for full-process measurement. However, existing mechanical contact pile hole diameter measurement technology requires full-process measurement of the pile hole from top to bottom, and requires maintaining a large contact pressure between the measuring arm and the hole wall, resulting in slow descent speed of the measuring mechanism and high overall measurement time cost. To address this, we propose a borehole diameter measurement device for bored piles used in highway construction.

[0005] To achieve the above objectives, this application adopts the following technical solution: a borehole diameter measuring device for bored piles used in highway construction, comprising: a bored pile well, a take-up and release mechanism erected at the pile opening of the bored pile well, a take-up and release rope installed at the bottom of the take-up and release mechanism, and an adjustment component installed at the bottom end of the take-up and release rope, the adjustment component comprising a counterweight column, an adjusting sleeve and a fixing sleeve sleeved on the outside of the counterweight column, the adjusting sleeve and the counterweight column being slidably connected, a plurality of vertical rods arranged in a circular array on the outside of the counterweight column, and the vertical rods being slidably connected to the inner wall of the bored pile well, a measuring mechanism installed at the bottom end of the counterweight column, the measuring mechanism comprising a measuring cylinder, a trigger component coaxially arranged inside the measuring cylinder, the trigger component comprising a trigger ball, four sets of trigger blocks arranged in a circular array on the outside of the trigger ball, and a contact measuring component correspondingly arranged on the outer wall of each set of trigger blocks;

[0006] The contact measurement component includes a measuring arm, which is slidably connected to the measuring cylinder. When the measuring arm extends outward or retracts inward by a displacement greater than the standard distance, it triggers the trigger block to slide inward, and simultaneously drives the adjusting sleeve to slide upward along the counterweight column, thereby causing the vertical rod to expand outward. By increasing the friction between the vertical rod and the inner wall of the grouting pile well, the descent speed of the measuring mechanism is reduced.

[0007] The triggering component is equipped with a rotation adjustment component, which is used to drive the measuring cylinder to rotate 90 degrees with the contact measuring component during the upward movement of the adjusting sleeve, thereby eliminating the misjudgment of measurement results caused by the stone blocking the measurement.

[0008] Preferably, the contact measuring assembly further includes a mounting base, which is fixedly connected to the inner wall of the measuring cylinder. A fulcrum shaft is fixedly connected to the end of the mounting base away from the measuring cylinder, and a swing rod is rotatably connected to the outside of the fulcrum shaft.

[0009] Preferably, the bottom end of the swing rod is hinged to the measuring arm, the top end of the swing rod is rotatably connected to a shaft-type slider, the top surface inside the measuring cylinder is fixedly connected to a first spring, and the bottom end of the first spring is fixedly connected to a push block. The bottom of the push block is provided with a first sliding groove, and the shaft-type slider is slidably connected to the inside of the first sliding groove.

[0010] Preferably, the push block includes a horizontal part and an inclined part. The horizontal part is located at the bottom of the push block, and the inclined part is located on the side of the push block near the trigger block. When the measuring arm extends outward by a distance less than the standard distance, the axial slider slides in the first groove inside the horizontal part, and the top of the swing rod does not contact the trigger block. When the measuring arm extends outward by a distance greater than the standard distance, the axial slider slides to the first groove inside the inclined part. At this time, the push block is pushed downward under the elastic force of the first spring, and the bottom end of the swing rod continuously applies an outward pushing force to the measuring arm to ensure that its outer end maintains effective contact with the inner wall of the grouting pile well, and the top of the swing rod pushes the trigger block to move.

[0011] Preferably, an inverted T-shaped slider is fixedly connected to the bottom of the trigger block, and a second sliding groove is provided on the bottom surface inside the measuring cylinder. The inverted T-shaped slider is slidably connected to the inside of the second sliding groove. A displacement sensor is installed inside the inverted T-shaped slider to measure the displacement distance of the inverted T-shaped slider. The distance that the measuring arm extends outward or retracts inward is calculated by measuring the displacement distance, thereby measuring the size of the pile hole diameter.

[0012] Preferably, a top block is fixedly connected to the top of the trigger ball, a second spring is fixedly connected to the top of the top block, and the top of the second spring is fixedly connected to the measuring cylinder.

[0013] Preferably, the outer annular array of the second spring is provided with a lifting rod, the bottom end of the lifting rod is fixedly connected to the top block, and the top end of the lifting rod is fixedly connected to a rotating ring, which is rotatably connected to the inside of the adjusting sleeve.

[0014] Preferably, the rotation adjustment assembly includes a rotating torsion block and a torsion groove. The torsion groove is formed inside the counterweight column. The bottom end of the counterweight column is rotatably connected to the measuring cylinder. The bottom end of the rotating torsion block is fixedly connected to the top block, and the top end of the rotating torsion block is inserted into the torsion groove.

[0015] Preferably, the top of the vertical rod is hinged to an upper inclined connecting rod, and the end of the upper inclined connecting rod away from the vertical rod is hinged to the fixed sleeve.

[0016] Preferably, the bottom end of the vertical rod is hinged to a lower inclined connecting rod, and the end of the lower inclined connecting rod away from the vertical rod is hinged to the adjusting sleeve. The upper inclined connecting rod and the lower inclined connecting rod are symmetrically arranged about the horizontal central axis of the vertical rod.

[0017] The technical effects and advantages of this invention are as follows:

[0018] This invention utilizes a lever structure formed by a swing rod, combined with a torsion spring to drive the measuring arm, enabling rapid descent of the measuring arm with low contact pressure within the standard borehole diameter range, effectively improving detection efficiency. The trigger block and inverted T-slider displacement are triggered only when the borehole diameter exceeds the standard range, allowing for precise measurement using a displacement sensor. This reduces redundant data acquisition and processing costs, and the trigger component drives the adjustment component to expand, adaptively slowing the descent speed of the measuring mechanism, ensuring measurement accuracy for abnormal cross-sections and reducing equipment collision damage. Simultaneously, the device's rotary adjustment component can drive the measuring arm to rotate 90 degrees to adjust its position while triggering measurement, effectively avoiding borehole diameter misjudgment caused by a single measuring arm jamming. Ultimately, this invention achieves multiple objectives in the detection of bored pile boreholes: efficient screening, accurate measurement, and misjudgment avoidance. It significantly shortens the detection period, reduces equipment maintenance costs, and provides reliable data support for the quality acceptance of bored pile boreholes in highway construction and subsequent repairs. Attached Figure Description

[0019] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0020] Figure 1 This is a cross-sectional structural diagram of the overall measurement state of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the entire invention;

[0022] Figure 3 This is a cross-sectional structural diagram of the measuring mechanism of the present invention in a state of standard measuring range;

[0023] Figure 4 This is a schematic cross-sectional view of the contact measurement component of the measurement mechanism of the present invention in an inward contraction exceeding the standard state.

[0024] Figure 5 This is a schematic cross-sectional view of the contact measurement component of the measurement mechanism of the present invention extending outward beyond the standard state.

[0025] Figure 6 This is a three-dimensional structural diagram of the contact measurement component of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the trigger component of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of the rotation adjustment component of the present invention;

[0028] Figure 9 This is a three-dimensional structural diagram of the adjustment component part of the present invention.

[0029] Legend: 1. Cast-in-place pile well; 2. Retraction and release mechanism; 3. Retraction and release rope; 4. Adjustment assembly; 5. Measuring cylinder; 6. Contact measuring assembly; 7. Trigger assembly; 8. Rotary adjustment assembly; 401. Counterweight column; 402. Adjusting sleeve; 403. Fixed sleeve; 404. Upper inclined connecting rod; 405. Vertical rod; 406. Lower inclined connecting rod; 601. Mounting base; 602. Pivot pivot; 603. Swing rod; 604. Measuring arm; 605. Shaft-type slider; 606. Push block; 607. First slide groove; 608. First spring; 701. Trigger ball; 702. Trigger block; 703. Inverted T-slider; 704. Second slide groove; 705. Top block; 706. Second spring; 707. Lifting rod; 708. Rotary ring; 801. Rotating torsion block; 802. Torsion groove. Detailed Implementation

[0030] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0031] Reference Figure 1 and Figure 2 As shown, the present invention provides a technical solution: a borehole diameter measuring device for bored piles used in highway construction, comprising: a bored pile well 1, a take-up and release mechanism 2 erected at the pile opening of the bored pile well 1, a take-up and release rope 3 installed at the bottom of the take-up and release mechanism 2, and an adjustment component 4 installed at the bottom end of the take-up and release rope 3, the adjustment component 4 comprising a counterweight column 401, an adjusting sleeve 402 and a fixing sleeve 403 sleeved on the outside of the counterweight column 401, the adjusting sleeve 402 and the counterweight column 401 being slidably connected, and a plurality of vertical rods 405 arranged in a circular array on the outside of the counterweight column 401, and the vertical rods 405 being slidably connected to the inner wall of the bored pile well 1. During the descent, the plurality of vertical rods 405 arranged in a circular array slide down the inner wall of the bored pile well 1, so as to position the counterweight column 401 at the central axis of the bored pile well 1, thereby aligning the measuring mechanism below it with the center of the bored pile well 1.

[0032] Existing mechanical contact pile hole diameter measurement technology, in the inspection of cast-in-place pile holes in highway construction, generally adopts a mode of measuring each cross-section of the pile hole from top to bottom. When the pile hole experiences local enlargement, only by maintaining sufficient contact pressure can the measuring arm be driven to extend outward in time to fit the hole wall, avoiding loss of contact and data due to increased relative distance. However, the large contact pressure set to cope with abnormal enlargement will significantly increase the downward resistance of the measuring mechanism in the pile hole when the hole diameter is within the normal range, reducing measurement efficiency and thus significantly increasing the overall time cost of hole diameter measurement. To solve the above technical problems, this application makes the following improvements:

[0033] Please see Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a measuring mechanism is installed at the bottom of the counterweight column 401. The measuring mechanism includes a measuring cylinder 5. A trigger assembly 7 is coaxially arranged inside the measuring cylinder 5. The trigger assembly 7 includes a trigger ball 701. Four sets of trigger blocks 702 are arranged in a ring array outside the trigger ball 701. A contact measuring assembly 6 is correspondingly arranged on the outer wall of each set of trigger blocks 702. The contact measuring assembly 6 includes a mounting base 601, which is fixedly connected to the inner wall of the measuring cylinder 5. A fulcrum shaft 602 is fixedly connected to the end of the mounting base 601 away from the measuring cylinder 5. A swing rod 603 is rotatably connected to the outside of the fulcrum shaft 602. The fulcrum shaft 602 is equipped with a torsion spring for extending the measuring arm 604 outward. The force is relatively small, only enough to allow the measuring arm 604 to extend outward slightly beyond the standard distance; according to industry standards, the standard range is usually from the preset hole diameter of the cast-in-place pile minus fifty millimeters to the preset hole diameter plus fifty millimeters. The standard distance refers to the distance the measuring arm 604 extends when the pile hole diameter is still within the standard range. The bottom end of the swing rod 603 is hinged to the measuring arm 604, and the top end of the swing rod 603 is rotatably connected to the shaft slider 605. The top surface inside the measuring cylinder 5 is fixedly connected to the first spring 608, and the bottom end of the first spring 608 is fixedly connected to the push block 606. The bottom of the push block 606 is provided with a first groove 607, and the shaft slider 605 is slidably connected inside the first groove 607.

[0034] When the diameter of the grouting pile well 1 expands or shrinks within the standard range, the outward pushing force on the measuring arm 604 comes only from the force of the torsion spring in the pivot shaft 602 driving the swing rod 603 to rotate. This force is small and will not cause a large contact pressure between the measuring arm 604 and the inner wall of the grouting pile well 1. It is only used to ensure effective contact between the outer end of the measuring arm 604 and the inner wall of the grouting pile well 1 when the diameter is within the standard range. There is no need to preset too large a force to deal with the situation when the diameter expands beyond the range. Therefore, when the inner diameter of the grouting pile well 1 is within the standard range, the contact pressure between the measuring arm 604 and the inner wall of the grouting pile well 1 is small, which in turn reduces the friction and descent resistance, allowing the adjustment component 4 and the measuring mechanism to maintain a faster descent speed.

[0035] When the inner diameter of the grouting pile well is within the standard range, the measuring mechanism maintains a relatively fast descent speed to avoid the problem of excessive measurement time caused by the high contact pressure throughout the process in existing technologies. Furthermore, it can still effectively determine whether the hole diameter is within the standard range during the rapid descent process. This not only meets the requirements for the quality inspection of grouting pile holes in highway construction, but also shortens the overall construction period of hole inspection, adapting to the on-site needs of efficient highway construction.

[0036] Please see Figure 5 As shown, the push block 606 includes a horizontal part and an inclined part. The horizontal part is located at the bottom of the push block 606, and the inclined part is located on the side of the push block 606 near the trigger block 702. When the measuring arm 604 extends outward by a distance less than the standard distance, the shaft slider 605 slides in the first groove 607 inside the horizontal part, and the top of the swing rod 603 does not contact the trigger block 702. When the measuring arm 604 extends outward by a distance greater than the standard distance, the shaft slider 605 slides to the first groove 607 inside the inclined part. At this time, the push block 606 is pushed downward under the elastic force of the first spring 608. The bottom end of the swing rod 603 continuously applies an outward pushing force to the measuring arm 604, ensuring that its outer end maintains effective contact with the inner wall of the grouting pile well 1, and the top end of the swing rod 603 pushes the trigger block 702 to move.

[0037] The contact measurement component 6 includes a measuring arm 604, which is slidably connected to the measuring cylinder 5. When the measuring arm 604 extends outward or retracts inward by a distance greater than the standard distance, the trigger block 702 is triggered to slide inward. The bottom of the trigger block 702 is fixedly connected to an inverted T-slider 703. A second groove 704 is provided on the bottom surface inside the measuring cylinder 5. The inverted T-slider 703 is slidably connected inside the second groove 704. A displacement sensor is installed inside the inverted T-slider 703 to measure the displacement distance of the inverted T-slider 703. The distance that the measuring arm 604 extends outward or retracts inward is calculated by measuring the displacement distance, thereby measuring the size of the pile hole diameter.

[0038] The measurement action is triggered only when the hole diameter exceeds the standard range, which avoids meaningless measurement of the qualified cross section of the entire depth of the cast-in-place pile well, greatly reduces the working time and data processing volume of the measurement agency, and significantly improves the overall efficiency of hole detection. At the same time, it focuses on the accurate collection of abnormal hole diameter data, avoids the redundant storage of a large amount of qualified data, and facilitates the rapid location of the pile hole quality defects, providing a direct basis for construction rectification.

[0039] Please see Figure 7 As shown, a top block 705 is fixedly connected to the top of the trigger ball 701, a second spring 706 is fixedly connected to the top of the top block 705, and the top of the second spring 706 is fixedly connected to the measuring cylinder 5. A lifting rod 707 is arranged in a ring array outside the second spring 706. The bottom end of the lifting rod 707 is fixedly connected to the top block 705, and a rotating ring 708 is fixedly connected to the top of the lifting rod 707. The rotating ring 708 is rotatably connected to the inside of the adjusting sleeve 402.

[0040] Please see Figure 9 As shown, the top of the vertical rod 405 is hinged to an upper inclined connecting rod 404, and the end of the upper inclined connecting rod 404 away from the vertical rod 405 is hinged to the fixed sleeve 403. The bottom of the vertical rod 405 is hinged to a lower inclined connecting rod 406, and the end of the lower inclined connecting rod 406 away from the vertical rod 405 is hinged to the adjusting sleeve 402. The upper inclined connecting rod 404 and the lower inclined connecting rod 406 are symmetrically arranged about the horizontal central axis of the vertical rod 405. Each hinge is provided with a flexible sealing sleeve to prevent mud from affecting the rotation of the hinge shaft.

[0041] When the measuring arm 604 extends outward or retracts inward by a distance greater than the standard distance, the trigger block 702 slides inward. The trigger block 702 uses the inclined surface on the inner side of its top to squeeze the trigger ball 701, causing it to move upward. At the same time, the top block 705 and the lifting rod 707 drive the adjusting sleeve 402 to slide upward along the counterweight column 401, thereby causing the vertical rod 405 to expand outward. By increasing the contact pressure between the vertical rod 405 and the inner wall of the grouting pile well 1, the descent speed of the adjusting component 4 and the measuring mechanism is reduced.

[0042] When the borehole diameter is within the standard range, the measuring mechanism maintains a relatively fast descent speed, which can quickly complete the preliminary screening of the entire depth of the pile hole, avoiding the construction period delays caused by the low-speed measurement throughout the process in the existing technology. When the borehole diameter deviation exceeds the abnormal range, the measuring mechanism can adaptively slow down by adjusting component 4, which can more fully collect borehole diameter data at abnormal locations, ensuring the measurement accuracy of quality defects such as diameter expansion and diameter contraction. At the same time, the slow descent process can reduce the collision and impact between the measuring arm 604 and the abnormal borehole wall, reduce equipment wear, and ultimately significantly shorten the inspection time and control the equipment operation and maintenance costs while meeting the quality acceptance requirements of the cast-in-place pile hole in highway construction.

[0043] During pile hole construction, stones or protrusions generated during drilling may remain on the hole wall. When a set of measuring arms happens to come into contact with such obstacles, it will be forcibly limited and unable to properly conform to the actual contour of the hole wall. At this time, the measuring system will mistakenly identify the stuck position of the measuring arm 604 as the hole diameter boundary, rather than a real enlargement or necking defect. At the same time, the measuring arms of conventional measuring mechanisms are mostly arranged at a fixed angle and cannot be adjusted to avoid obstacles, which leads to the collected hole diameter data deviating from the actual value, ultimately causing misjudgment of the pile hole formation quality. In order to solve this technical problem, this application makes the following improvements:

[0044] Please see Figure 8 As shown, a rotation adjustment component 8 is installed inside the trigger component 7. The rotation adjustment component 8 includes a rotation twist block 801 and a twist groove 802. The twist groove 802 is opened inside the counterweight column 401. The bottom end of the counterweight column 401 is rotatably connected to the measuring cylinder 5. The bottom end of the rotation twist block 801 is fixedly connected to the top block 705, and the top end of the rotation twist block 801 is inserted into the twist groove 802. The rotation adjustment component 8 is used to drive the measuring cylinder 5 to rotate the contact measuring component 6 by 90 degrees during the process of the adjusting sleeve 402 rising, thereby eliminating the misjudgment of the measurement result caused by the stone block jamming.

[0045] When one set of measuring arms 604 becomes stuck due to contact with a rock on the borehole wall, the measuring mechanism rotates 90 degrees, which can adjust the position of all four sets of measuring arms 604 as a whole. This allows the stuck measuring arm to disengage from the rock, while the other three sets of measuring arms re-adhere to the borehole wall and completely cover the cross-section of the pile hole. This avoids distortion of the borehole diameter data caused by the obstruction of a single measuring arm, ensuring accurate judgment of abnormal working conditions such as diameter expansion and necking, and providing real and effective data support for the rectification of defects in the quality of cast-in-place pile boreholes.

[0046] Working principle: First, the adjustment component 4 and the measuring mechanism are aligned and placed into the interior of the grouting pile well 1. At the same time, the take-up and release mechanism 2 is set up at the pile opening of the grouting pile well 1. The take-up and release rope 3 is gradually released through the take-up and release mechanism 2. Under the action of gravity, the adjustment component 4 and the measuring mechanism sink into the interior of the grouting pile well 1.

[0047] When the inner diameter of the grouting pile well 1 is within the standard range, even if the inner diameter of the grouting pile well 1 is slightly smaller or larger, these deviations will cause the swing rod 603 to swing at a certain angle through the measuring arm 604. However, at this time, the top and bottom ends of the swing rod 603 are not in contact with the trigger block 702, and the trigger block 702 is not pushed to move the inverted T slider 703. The inverted T slider 703 has no displacement, so the inner diameter of the grouting pile well 1 is not measured. At this time, the outward pushing force on the measuring arm 604 comes only from the force of the torsion spring in the pivot shaft 602 driving the swing rod 603 to rotate. This force is small and will not cause a large contact pressure between the measuring arm 604 and the inner wall of the grouting pile well 1. Therefore, when the inner diameter of the grouting pile well 1 is within the standard range, the adjusting component 4 and the measuring mechanism can maintain a relatively fast descent.

[0048] When the inner diameter of the cast-in-place pile well 1 is smaller than the standard range, the amount by which its inner wall contracts inward against the measuring arm 604 is greater than the standard displacement. At this time, the end of the measuring arm 604 tilts inward against the bottom of the swing rod 603. The bottom of the swing rod 603 pushes the trigger block 702, which in turn slides the inverted T slider 703 inward. The inverted T slider 703 is displaced, and the displacement sensor inside records and transmits the displacement outward. The tilt angle of the swing rod 603 is calculated from the displacement, and then the amount of inward contraction of the measuring arm 604 is calculated. Thus, the hole diameter when the inner diameter of the cast-in-place pile well 1 is smaller than the standard range can be measured.

[0049] When the inner diameter of the grouting pile well 1 is larger than the standard range, the measuring arm 604 extends outward continuously, pulling the bottom of the swing rod 603 to tilt outward. At this time, the top of the swing rod 603 moves inward with the shaft slider 605, causing the shaft slider 605 to slide from the horizontal part of the push block 606 to the inside of the first groove 607 at the inclined part. Under the elastic action of the first spring 608, it pushes the push block 606 downward, squeezing the swing rod 603, adding a force to the swing rod 603 to tilt the top inward, and at the same time causing the bottom of the swing rod 603 to rotate outward, adding an outward pushing force to the measuring arm 604, so as to ensure that when the hole diameter of the grouting pile well 1 exceeds the standard range, the outer end of the measuring arm 604 can still maintain effective contact with its inner wall to achieve measurement. The top of the swing rod 603 pushes the trigger block 702 to move the inverted T slider 703 inward. Similarly, the hole diameter of the grouting pile well 1 when it is larger than the standard range can be obtained by measuring the displacement of the inverted T slider 703.

[0050] As the trigger assembly 7 moves inward, the inclined surface on its inner top presses against the trigger ball 701, causing it to move upward. Simultaneously, the top block 705 and the lifting rod 707 push the adjusting sleeve 402 upward. When the adjusting sleeve 402 moves upward, the distance between the adjusting sleeve 402 and the fixed sleeve 403 decreases, causing the upper inclined connecting rod 404 and the lower inclined connecting rod 406 to rotate. This drives the vertical rod 405 to expand outward, increasing the contact pressure between the vertical rod 405 and the inner wall of the grouting pile well 1, thereby increasing the friction between them. This slows down the descent speed of the adjusting assembly 4 carrying the measuring mechanism, allowing the measuring mechanism to perform targeted measurements at a slower speed when the diameter of the grouting pile well 1 is outside the standard range, in order to obtain deviation data and provide a basis for subsequent adjustments.

[0051] As the top block 705 rises, it carries the rotating twist block 801 and gradually inserts it into the twist groove 802. Due to the special twisted shape of the rotating twist block 801, its bottom end rotates with the top block 705 as it gradually inserts into the twist groove 802. The top block 705 then rotates the measuring cylinder 5 and the measuring arm 604 through the lifting rod 707. The rotation angle is ninety degrees, so that the four sets of measuring arms 604 arranged in a ring array can just cover one circle of the inner diameter of the grouting pile well 1, avoiding misjudgment due to special circumstances such as the outer end of a measuring arm 604 hitting a stone.

[0052] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A device for measuring the borehole diameter of bored piles used in highway construction, characterized in that, The system includes a cast-in-place pile well. A take-up and release mechanism is installed at the pile opening of the well. A take-up and release rope is installed at the bottom of the mechanism, and an adjustment component is installed at the bottom end of the rope. The adjustment component includes a counterweight column. An adjusting sleeve and a fixing sleeve are fitted around the counterweight column, and the adjusting sleeve is slidably connected to the counterweight column. Several vertical rods are arranged in a circular array around the counterweight column, and these vertical rods are slidably connected to the inner wall of the cast-in-place pile well. A measuring mechanism is installed at the bottom end of the counterweight column. The measuring mechanism includes a measuring cylinder. A triggering component is coaxially arranged inside the measuring cylinder. The triggering component includes a trigger ball. Four sets of trigger blocks are arranged in a circular array around the trigger ball, and a contact measuring component is correspondingly arranged on the outer wall of each set of trigger blocks. The contact measurement component includes a measuring arm, which is slidably connected to the measuring cylinder. When the measuring arm extends outward or retracts inward by a displacement greater than the standard distance, it triggers the trigger block to slide inward, and simultaneously drives the adjusting sleeve to slide upward along the counterweight column, thereby causing the vertical rod to expand outward. By increasing the friction between the vertical rod and the inner wall of the grouting pile well, the descent speed of the measuring mechanism is reduced. The triggering component is equipped with a rotation adjustment component, which is used to drive the measuring cylinder to rotate the contact measuring component by 90 degrees during the process of the adjusting sleeve rising, thereby eliminating the misjudgment of the measurement result caused by the stone blocking the measuring result. The rotation adjustment assembly includes a rotating torsion block and a torsion groove. The torsion groove is opened inside the counterweight column. The bottom end of the counterweight column is rotatably connected to the measuring cylinder. The bottom end of the rotating torsion block is fixedly connected to the top block, and the top end of the rotating torsion block is inserted into the torsion groove. The contact measuring assembly also includes a mounting base, which is fixedly connected to the inner wall of the measuring cylinder. A fulcrum shaft is fixedly connected to the end of the mounting base away from the measuring cylinder, and a swing rod is rotatably connected to the outside of the fulcrum shaft. The bottom end of the swing rod is hinged to the measuring arm, and the top end of the swing rod is rotatably connected to a shaft-type slider. The top surface inside the measuring cylinder is fixedly connected to a first spring, and the bottom end of the first spring is fixedly connected to a push block. The bottom of the push block is provided with a first sliding groove, and the shaft-type slider is slidably connected to the inside of the first sliding groove. The push block includes a horizontal part and an inclined part. The horizontal part is located at the bottom of the push block, and the inclined part is located on the side of the push block near the trigger block. When the measuring arm extends outward by a distance less than the standard distance, the axial slider slides in the first groove inside the horizontal part, and the top of the swing rod does not contact the trigger block. When the measuring arm extends outward by a distance greater than the standard distance, the axial slider slides to the first groove inside the inclined part. At this time, the push block is pushed downward under the elastic force of the first spring. The bottom end of the swing rod continuously applies an outward pushing force to the measuring arm, ensuring that its outer end maintains effective contact with the inner wall of the grouting pile well, and the top of the swing rod pushes the trigger block to move. The top of the trigger ball is fixedly connected to a top block, the top of the top block is fixedly connected to a second spring, and the top of the second spring is fixedly connected to the measuring cylinder. The second spring has a lifting rod arranged in an outer annular array. The bottom end of the lifting rod is fixedly connected to the top block, and the top end of the lifting rod is fixedly connected to a rotating ring, which is rotatably connected to the inside of the adjusting sleeve.

2. The borehole diameter measuring device for bored piles used in highway construction according to claim 1, characterized in that: The bottom of the trigger block is fixedly connected to an inverted T-shaped slider. A second groove is provided on the bottom surface inside the measuring cylinder. The inverted T-shaped slider is slidably connected inside the second groove. A displacement sensor is installed inside the inverted T-shaped slider to measure the displacement distance of the inverted T-shaped slider. The distance the measuring arm extends outward or retracts inward is calculated by measuring the displacement distance, thereby measuring the size of the pile hole diameter.

3. The borehole diameter measuring device for bored piles used in highway construction according to claim 1, characterized in that: The top of the vertical rod is hinged to an upper inclined connecting rod, and the end of the upper inclined connecting rod away from the vertical rod is hinged to the fixed sleeve.

4. The borehole diameter measuring device for bored piles used in highway construction according to claim 3, characterized in that: The bottom end of the vertical rod is hinged to a lower inclined connecting rod, and the end of the lower inclined connecting rod away from the vertical rod is hinged to the adjusting sleeve. The upper inclined connecting rod and the lower inclined connecting rod are symmetrically arranged about the horizontal central axis of the vertical rod.

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