CN210862492U

CN210862492U - Pile foundation hole depth measuring device

Info

Publication number: CN210862492U
Application number: CN201922048799.2U
Authority: CN
Inventors: 肖登峰; 肖德威; 闵华峰
Original assignee: Hubei Edong Pile Foundation Engineering Co ltd
Current assignee: Hubei Edong Pile Foundation Engineering Co ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-06-26
Anticipated expiration: 2029-11-22

Abstract

The utility model relates to a pile foundation hole depth measuring device, which comprises a bracket, the rope roller, the survey rope, sash weight and clean box, the rope roller rotates and installs at the support upside, be equipped with drive rope roller pivoted power spare on the support, the winding of survey rope is on the rope roller, and survey rope one end top-down is vertical to be passed the clean box, the bottom and the sash weight of survey rope are fixed, be equipped with two axis levels in the clean box and be in the squeeze roll of same horizontal plane, the survey rope is located between two squeeze rolls, be equipped with the slip subassembly that is used for driving two squeeze rolls each other firmly and is close to or keeps away from on the clean box, be equipped with the washing piece that is used for orientation survey rope water spray in the clean box, the washing piece is located. The utility model discloses have self-cleaning survey rope, reduce survey rope surface ponding, extension survey rope life's effect.

Description

Pile foundation hole depth measuring device

Technical Field

The utility model belongs to the technical field of the technique of engineering construction and specifically relates to a pile foundation hole depth measuring device is related to.

Background

The hole depth must be measured many times during building pile foundation engineering drilling and concreting construction, if geology is better, when adopting dry drilling pore-forming technology, the measuring hole depth can directly adopt the steel ruler, if geology is relatively poor, when adopting mud dado machinery pore-forming technology, generally adopt the survey rope to measure, during the measurement, the survey rope must stretch into in the drilling mud, until the hole bottom, after the measurement is accomplished, the survey rope is polluted by the mud, when receiving the rope, must clear up the back and just can receive to the reuse of preparation. However, in actual construction, due to repeated measurement, trouble is saved, when the measuring rope is folded, the measuring rope is mostly directly placed on the ground, mud cannot be cleaned or grass is cleaned, and the service life of the measuring rope is short; meanwhile, most of the measuring rope materials in the prior art are made of nylon materials, and after the measuring rope is used for a period of time, the measuring rope is deformed and damaged due to slurry soaking or friction. The digital mark on the measuring rope is made of an iron sheet material, and the measuring rope is tightly wrapped and clamped on the nylon measuring rope, so that the phenomena of movement or falling off and the like easily occur, and the service cycle and the service life of the measuring rope are short.

The Chinese patent with the publication number of CN204163712U is retrieved, and discloses a self-cleaning type building pile foundation hole depth measuring device, which comprises a hole depth measuring mechanism with a thread rope and a cleaning device for cleaning the thread rope, wherein the hole depth measuring mechanism comprises a support, a wire collecting device and a wire hammer, the wire collecting device is fixed on the support and used for collecting and paying off the wire, the wire hammer is connected to the tail end of the thread rope, and the cleaning device comprises a water storage device with a water outlet and a water pipe connected to the water outlet of the water storage device and the wire outlet end of the wire collecting device.

The above prior art solutions have the following drawbacks: after the cotton rope is cleaned by water in the water storage device, more accumulated water is remained on the cotton rope, and the cotton rope attached with the water is not easy to dry, so that the cotton rope can be mildewed in a humid environment for a long time, and the service life of the cotton rope is influenced.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a pile foundation hole depth measuring device has self-cleaning survey rope, reduces survey rope surface ponding, extension survey rope life's advantage.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides a pile foundation hole depth measuring device, includes support, rope roller, survey rope, sash weight and clean case, the rope roller rotates to be installed the support upside, be equipped with the drive on the support rope roller pivoted power spare, the survey rope twines on the rope roller, just survey rope one end top-down is vertical to be passed the clean case, the bottom and the sash weight of survey rope are fixed, be equipped with two axis levels in the clean case and be in the squeeze roll of same horizontal plane, the survey rope is located two between the squeeze roll, be equipped with on the clean case and be used for driving two the mutual firm sliding component who is close to or keeps away from of squeeze roll, be equipped with the washing piece that is used for towards the survey rope water spray in the clean case, the washing piece is located the below of squeeze roll.

By adopting the technical scheme, when the depth of the pile foundation hole is measured, the two extrusion rollers are in a mutually-far state, the power part drives the rope rollers to rotate, the measuring rope is unreeled and is driven to be in a stretched state continuously under the action of the gravity of the hanging hammer, and when the hanging hammer falls to the bottom of the pile foundation hole, the measuring rope is in a loose state, so that the depth of the pile foundation hole can be conveniently measured through the unreeling length of the measuring rope; when the winding rope is finished in the measurement, the sliding assembly drives the two squeeze rollers to be close to each other to slide, thereby the two squeeze rollers compress the measuring rope, the cleaning part sprays water towards the measuring rope to wash simultaneously, the measuring rope drives the rope roller to wind along with the power part, the measuring rope ascends gradually, the measuring rope cleans mud on the surface through spraying water first, the measuring rope ascends along with the measuring rope, the measuring rope goes up between the two squeeze rollers, the two squeeze rollers extrude and dewater the measuring rope, and along with the ascending of the measuring rope, the two squeeze rollers are driven to rotate, thereby the ascending of the measuring rope is facilitated, the possibility of damaging the measuring rope is reduced, because the moisture in the measuring rope is removed through extrusion, the moisture in the measuring rope is reduced, thereby the possibility of rotting and damaging the measuring rope is reduced, and the service life of the measuring rope is prolonged.

The utility model discloses can further configure into, two in a preferred example the tip of squeeze roll is all overlapped and is equipped with the sliding block, the slip subassembly includes two-way lead screw, guide bar and hand wheel, two-way lead screw with the guide bar is located respectively the both ends of squeeze roll, two-way lead screw with the sliding block of two squeeze roll tip is all worn to locate by the guide bar, two-way lead screw and guide bar length direction unanimously and all with the length direction of squeeze roll is perpendicular, two the sliding block of squeeze roll one end is established respectively the cover is established two-way lead screw both ends, two squeeze roll one end the sliding block all with two-way lead screw threaded connection, two-way lead screw one end is worn out the dustbin and with the coaxial fixed of hand wheel.

Through adopting the above-mentioned technical scheme, after the measurement is accomplished, during the rolling survey rope, drive two-way lead screw through rotating the hand wheel, because the sliding block of the one end of two squeeze rolls all with two-way lead screw threaded connection, thereby two sliding blocks slide, and two squeeze rolls are close to the slip, two sliding blocks on the two-way lead screw are located the both ends of two-way lead screw respectively, thereby two sliding blocks respectively with the both ends screw-thread fit of two-way lead screw, with this convenience drive two sliding blocks simultaneously and be close to the slip, two squeeze rolls are driven and are close to the extrusion survey rope, the survey rope is extruded and the dehydration, the water content in the survey rope has been reduced, thereby the possibility that the survey rope is rotten has been reduced, the.

The utility model discloses can further configure to in a preferred example, two the week side of squeeze roll all sets up the ring channel that the cross-section is semicircular in shape, the ring channel is in squeeze roll length direction's intermediate position.

Through adopting above-mentioned technical scheme, the survey rope is blocked and is inlayed in the ring channel of two squeeze rolls to reduced the possibility that the survey rope squinted when being extruded, the cell wall of ring channel carries out even extrusion to the survey rope simultaneously, and the week side atress of survey rope is even, and survey rope dehydration effect is better.

The utility model discloses can further configure to in a preferred example, the week side of squeeze roll with the cell wall of ring channel all is equipped with the rubber pad.

Through adopting above-mentioned technical scheme, the rubber pad replaces squeeze roll and survey rope contact to the survey rope is difficult for causing the damage of survey rope when the friction with the squeeze roll, and the squeeze roll is difficult because long-time and survey rope friction and self wearing and tearing.

The utility model discloses can further configure to in a preferred example, the cleaning box is just right one side of hand wheel is equipped with the restriction two the spacing subassembly that the squeeze roll was kept away from each other, spacing subassembly includes ratchet, pawl and spring, the fixed cover of ratchet is established on the two-way lead screw, the pawl rotates to be installed the cleaning box is just right one side of hand wheel, just the pawl with the ratchet meshing, the spring is used for promoting the pawl makes the pawl supports tightly in the teeth of a cogwheel of ratchet, work as two-way lead screw has the rotation and drives two when the trend that the squeeze roll was kept away from, the pawl restriction ratchet rotates and restricts two-way lead screw rotates.

Through adopting above-mentioned technical scheme, when two squeeze rolls extrusion rope measurements, for reducing the possibility that two squeeze rolls kept away from each other, thereby need to restrict the rotation direction that two-way lead screw made two squeeze rolls keep away from each other, the pawl has restricted the rotation of ratchet, thereby two-way lead screw is restricted and is rotated, make two squeeze rolls keep away from each other with difficult the rotating of this two-way lead screw, the rope measurement is when the extrusion that receives two squeeze rolls, the rope measurement is difficult for loosening of squeeze roll, thereby moisture on the rope measurement is easily extruded and is left the rope measurement, the moisture content in the rope measurement has been reduced, the life of the rope measurement has been prolonged.

The utility model discloses can further configure to in a preferred example, the maintenance mouth has been seted up to one side of clean case, the clean case in maintenance mouth department articulates there is the shutoff maintenance door of maintenance mouth.

Through adopting above-mentioned technical scheme, can make things convenient for workman's degree to change maintenance and clearance the part in the dustbin through the maintenance door.

The utility model discloses can further configure to in a preferred example, the removable sleeve that is equipped with the axis vertical on the interior roof of clean case, telescopic inboard is equipped with the sponge ring, the survey rope is worn to locate the sleeve.

By adopting the technical scheme, after the measuring rope is extruded by the two extrusion rollers, the measuring rope is wiped by the sponge in the sleeve through the sleeve, so that the water attached to the surface of the measuring rope is further reduced.

The utility model discloses can further configure to in a preferred example, a plurality of holes that leak have been seted up to the downside of cleaning box.

By adopting the technical scheme, after the measuring rope is washed by the cleaning piece, accumulated water in the cleaning box is conveniently discharged through the water leakage hole, so that the possibility that the measuring rope is wet again is reduced.

To sum up, the utility model discloses a following beneficial technological effect:

1. the measuring rope is wound, the cleaning piece sprays water to clean the measuring rope, the bidirectional screw rod is driven to rotate through the rotating hand wheel, the two extrusion rollers approach to each other to extrude the measuring rope along with the rotation of the bidirectional screw rod, and when the measuring rope passes through the extrusion rollers, the two extrusion rollers extrude the measuring rope to dewater the measuring rope, so that the content of water in the measuring rope is reduced, the possibility of mildewing of the measuring rope is reduced, and the service life of the measuring rope is prolonged;

2. when the two squeezing rollers squeeze the measuring rope, the pawl limits the rotation of the ratchet wheel in one direction, so that the two squeezing rollers are not easy to rotate and are far away from each other, and the dewatering effect of the measuring rope is improved;

3. the measuring rope passes through the sleeve after being dehydrated by the squeeze roll, so that the measuring rope is wiped by the sponge ring in the sleeve, and accumulated water on the measuring rope is further reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the interior of the cleaning tank of the present invention;

fig. 3 is an enlarged view at a in fig. 2.

Reference numerals: 1. a support; 2. a rope roller; 3. rope measurement; 4. hanging a hammer; 5. a cleaning tank; 6. a squeeze roll; 7. a slider; 8. a bidirectional screw rod; 9. a guide bar; 10. a hand wheel; 11. an annular groove; 12. a rubber pad; 13. a ratchet wheel; 14. a pawl; 15. a spring; 16. repairing the door; 17. a sleeve; 18. a sponge ring; 19. a water leakage hole; 20. a support plate; 21. a servo motor; 22. a water spray pipe; 23. and (4) a water pump.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, for the utility model discloses a pile foundation hole depth measuring device, including support 1, rope roller 2, survey rope 3, sash weight 4 and clean box 5. The support 1 is composed of two vertical and opposite support plates 20, and the rope roller 2 is rotatably installed between the two support plates 20 and is positioned on the upper side of the support plates 20. The support 1 is provided with a power part for driving the rope roller 2 to rotate, the power part is a servo motor 21 capable of rotating forward and backward, the servo motor 21 is fixed on one side of one support plate 20 departing from the other support plate 20, and the output shaft of the servo motor 21 is coaxially fixed with the rope roller 2. The measuring rope 3 is wound on the rope roller 2, one end of the measuring rope 3 vertically penetrates through the cleaning box 5 from top to bottom, and the bottom end of the measuring rope 3 is fixed with the hanging hammer 4. The cleaning box 5 is a square box body, and one side of the cleaning box 5 is fixed on the same side of the two supporting plates 20. Maintenance opening has been seted up to the one side that dustbin 5 deviates from backup pad 20, and dustbin 5 articulates in one side of maintenance opening has the maintenance door 16 that is used for the shutoff maintenance opening. When measuring the degree of depth in stake foundation hole, servo motor 21 drives rope roller 2 and unreels, and it is downthehole that survey rope 3 extends the pile foundation gradually along with unreeling, and the gravity of sash weight 4 makes survey rope 3 be in the state of tightening simultaneously, and when the bottom of a hole of sash weight 4 to stake foundation hole, survey rope 3 was lax this moment to this is convenient through the degree of depth that unreels length measurement stake foundation hole of survey rope 3.

Referring to fig. 1 and 2, after the measurement is completed, when the measuring line 3 is wound, the surface of the measuring line 3 needs to be cleaned. The cleaning box 5 is internally provided with a cleaning part for spraying water towards the measuring rope 3, and the cleaning part is a water spraying pipe 22. One end of the water spray pipe 22 is opposite to the measuring rope 3, the other end is communicated with a water pump 23, the water pump 23 is arranged on the ground, one end of the water pump 23 is communicated with the water spray pipe 22, and the other end is communicated in a water tank (not shown). The water pump 23 pumps water into the water spray pipe 22, and the water spray pipe 22 washes the peripheral side of the measuring rope 3, so that mud on the peripheral side of the measuring rope 3 is reduced, the possibility that the mud corrodes the measuring rope 3 is reduced, and the service life of the measuring rope 3 is prolonged.

Referring to fig. 2, a plurality of water leakage holes 19 are formed through the lower side of the cleaning tank 5 to reduce water accumulation in the cleaning tank 5.

Referring to fig. 1 and 2, two squeeze rollers 6 with horizontal axes and in the same horizontal plane are arranged in the cleaning tank 5, wherein the water spray pipe 22 is positioned at the lower side of the squeeze rollers 6, and the axes of the two squeeze rollers 6 are both arranged perpendicular to the support plate 20. The measuring line 3 is located between two squeeze rollers 6. Be equipped with on the cleaning box 5 and be used for driving the mutual firm slip subassembly that is close to or keeps away from of two squeeze roll 6, the slip subassembly includes two-way lead screw 8, guide bar 9 and hand wheel 10, wherein the tip of two-way lead screw 8 and guide bar 9 all rotates and installs the inboard at cleaning box 5. The end parts of the two extrusion rollers 6 are all sleeved with sliding blocks 7, the two-way screw rods 8 and the guide rods 9 are respectively positioned at two ends of the extrusion rollers 6, the two-way screw rods 8 and the guide rods 9 are all arranged on the sliding blocks 7 at the end parts of the two extrusion rollers 6 in a penetrating mode, and the length directions of the two-way screw rods 8 and the guide rods 9 are consistent and are perpendicular to the length direction of the extrusion rollers 6. The sliding blocks 7 at one ends of the two extrusion rollers 6 are respectively sleeved at two ends of the two-way screw rod 8, the sliding blocks 7 at one ends of the two extrusion rollers 6 are both in threaded connection with the two-way screw rod 8, and one end of the two-way screw rod 8 penetrates out of the cleaning box 5 and is coaxially fixed with the hand wheel 10. When the measuring rope 3 is rolled up, the rotating hand wheel 10 drives the bidirectional screw rod 8 to rotate, because two sliding blocks 7 on the bidirectional screw rod 8 are both in threaded connection with the bidirectional screw rod 8, and the two sliding blocks 7 on the bidirectional screw rod 8 are respectively in threaded fit with two sections of the bidirectional screw rod 8, so that the two sliding blocks 7 are close to each other and slide along with the rotation of the bidirectional screw rod 8, the two extrusion rollers 6 are driven to be close to the extrusion measuring rope 3, the measuring rope 3 is extruded and dehydrated, the water content in the measuring rope 3 is reduced, the possibility of rotting of the measuring rope 3 is reduced, and the service life of the measuring rope 3 is prolonged.

Referring to fig. 2, in order to reduce the possibility that the measuring rope 3 is extruded by the extruding rollers 6, the measuring rope 3 slides along the axes of the extruding rollers 6, so that annular grooves 11 with semicircular sections are formed on the peripheral sides of the extruding rollers 6, and the annular grooves 11 are located in the middle of the extruding rollers 6 in the length direction. When the measuring rope 3 is extruded, the measuring rope 3 is positioned in the two annular grooves 11, and the groove walls of the two annular grooves 11 uniformly extrude the peripheral side of the measuring rope 3. Rubber pads 12 are bonded on the peripheral side of the extrusion roller 6 and the groove wall of the annular groove 11, so that the mutual abrasion between the measuring rope 3 and the extrusion roller 6 is reduced.

Referring to fig. 2 and 3, a limiting assembly for limiting the two squeezing rollers 6 from moving away from each other is arranged on one side of the cleaning box 5, which faces the hand wheel 10, and comprises a ratchet wheel 13, a pawl 14 and a spring 15. The ratchet wheel 13 is fixedly sleeved on the peripheral side of the bidirectional screw rod 8, the pawl 14 is rotatably installed on one side of the cleaning box 5, which is opposite to the hand wheel 10, and the pawl 14 is meshed with the ratchet wheel 13. The cleaning box 5 is fixed with a mounting plate on one side of the pawl 14, the spring 15 is used for pushing the pawl 14 to enable the pawl 14 to be tightly pressed in the gear teeth of the ratchet wheel 13, one end of the spring 15 is fixed on the mounting plate, the other end of the spring 15 is fixed on the pawl 14, and the spring 15 is continuously in a compressed state. When the bidirectional screw 8 tends to rotate to drive the two squeezing rollers 6 to move away, the pawl 14 limits the rotation of the ratchet wheel 13 and limits the rotation of the bidirectional screw 8. The squeeze roller 6 is not easy to be far away, so that the dehydration quality of the measuring rope 3 is better. When the measuring rope 3 is unreeled again, the pawl 14 is firstly pulled, the spring 15 is further compressed, the pawl 14 is separated from the ratchet wheel 13, and therefore the hand wheel 10 is conveniently rotated to drive the two extrusion rollers 6 to be away from each other.

Referring to fig. 2, the removable sleeve 17 that is equipped with the axis vertical on the interior roof of cleaning box 5, sleeve 17's inboard bonding has sponge ring 18, and sleeve 17 is worn to locate by survey rope 3, and the inboard conflict of sponge ring 18 is in the week side of survey rope 3. After the measuring rope 3 is extruded and dehydrated, the measuring rope is wiped by the sponge mat, so that the water content of the measuring rope 3 is further reduced, the possibility of mildewing the measuring rope 3 is reduced, and the service life of the measuring rope 3 is prolonged.

Referring to fig. 1 and 2, two bolts penetrate through the upper side of the cleaning box 5 vertically, the two bolts penetrate through the upper side of the cleaning box 5 and are in threaded connection with the top end of the sleeve 17, and the connecting line direction of the two bolts passes through the axis of the sleeve 17, so that the sleeve 17 is convenient to replace.

The implementation principle of the embodiment is as follows:

when the depth of the pile foundation hole is measured, the two extrusion rollers 6 are in a mutually-far state, the power part drives the rope roller 2 to rotate, the measuring rope 3 is unreeled, the measuring rope 3 is driven to be in a stretched state continuously under the action of the gravity of the hanging hammer 4, and when the hanging hammer 4 falls to the bottom of the pile foundation hole, the measuring rope 3 is in a loose state, so that the depth of the pile foundation hole can be conveniently measured through the unreeling length of the measuring rope 3; when the rope is coiled after measurement, the sliding assembly drives the two extrusion rollers 6 to slide close to each other, so that the two extrusion rollers 6 compress the measuring rope 3, the cleaning piece sprays water to wash towards the measuring rope 3, the measuring rope 3 gradually rises along with the driving piece driving the rope roller 2 to coil, the measuring rope 3 firstly sprays water to clean mud on the surface, and the measuring rope 3 passes between the two extrusion rollers 6 along with the rising of the measuring rope 3, and the two extrusion rollers 6 extrude the measuring rope 3 to dewater; with the rising of the measuring rope 3, the two squeezing rollers 6 are driven to rotate, so that the rising of the measuring rope 3 is facilitated, and the possibility of damaging the measuring rope 3 is reduced; the measuring rope 3 finally passes through the sleeve 17 and is wiped to the measuring rope 3 through the sponge ring 18, and the moisture in the measuring rope 3 is squeezed to be removed, so that the moisture in the measuring rope 3 is reduced, the possibility of rotten damage of the measuring rope 3 is reduced, and the service life of the measuring rope 3 is prolonged.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A pile foundation hole depth measuring device, characterized by includes: the device comprises a support (1), a rope roller (2), a measuring rope (3), a hanging hammer (4) and a cleaning box (5), wherein the rope roller (2) is rotatably installed on the upper side of the support (1), a power part for driving the rope roller (2) to rotate is arranged on the support (1), the measuring rope (3) is wound on the rope roller (2), one end of the measuring rope (3) vertically penetrates through the cleaning box (5) from top to bottom, the bottom end of the measuring rope (3) is fixed with the hanging hammer (4), two squeeze rollers (6) with horizontal axes and on the same horizontal plane are arranged in the cleaning box (5), the measuring rope (3) is positioned between the two squeeze rollers (6), a sliding assembly for driving the two squeeze rollers (6) to be firmly close to or far away from each other is arranged on the cleaning box (5), and a cleaning part for spraying water towards the measuring rope (3) is arranged in the cleaning box (5), the cleaning element is located below the squeeze roll (6).

2. The pile foundation hole depth measuring device according to claim 1, wherein two ends of the extrusion rollers (6) are respectively sleeved with a sliding block (7), the sliding assembly comprises a bidirectional screw rod (8), a guide rod (9) and a hand wheel (10), the bidirectional screw rod (8) and the guide rod (9) are respectively located at two ends of the extrusion rollers (6), the bidirectional screw rod (8) and the guide rod (9) are respectively arranged on the sliding blocks (7) at the ends of the two extrusion rollers (6), the length directions of the bidirectional screw rod (8) and the guide rod (9) are consistent and are respectively perpendicular to the length direction of the extrusion rollers (6), the sliding blocks (7) at one end of the two extrusion rollers (6) are respectively sleeved at two ends of the bidirectional screw rod (8), and the sliding blocks (7) at one end of the two extrusion rollers (6) are both in threaded connection with the bidirectional screw rod (8), one end of the bidirectional screw rod (8) penetrates out of the cleaning box (5) and is coaxially fixed with the hand wheel (10).

3. The pile foundation hole depth measuring device according to claim 2, wherein annular grooves (11) with semicircular sections are formed in the peripheral sides of the two squeeze rollers (6), and the annular grooves (11) are located in the middle of the squeeze rollers (6) in the length direction.

4. A pile foundation hole depth measuring device according to claim 3, wherein the circumferential side of the squeeze roller (6) and the groove wall of the annular groove (11) are provided with rubber pads (12).

5. The pile foundation hole depth measuring device according to claim 2, wherein one side of the cleaning box (5) facing the hand wheel (10) is provided with a limiting component for limiting the two extrusion rollers (6) to be away from each other, the limiting component comprises a ratchet wheel (13), a pawl (14) and a spring (15), the ratchet wheel (13) is fixedly sleeved on the bidirectional screw rod (8), the pawl (14) is rotatably arranged on one side of the cleaning box (5) opposite to the hand wheel (10), the pawl (14) is meshed with the ratchet wheel (13), the spring (15) is used for pushing the pawl (14) to enable the pawl (14) to be tightly pressed in the gear teeth of the ratchet wheel (13), when the bidirectional screw rod (8) has the tendency of rotating to drive the two squeezing rollers (6) to be far away, the pawl (14) limits the rotation of the ratchet wheel (13) and limits the rotation of the bidirectional screw rod (8).

6. The pile foundation hole depth measuring device according to claim 1, wherein a maintenance opening is formed in one side of the cleaning box (5), and a maintenance door (16) used for plugging the maintenance opening is hinged to the cleaning box (5) at the maintenance opening.

7. The pile foundation hole depth measuring device according to claim 1, wherein a sleeve (17) with a vertical axis is detachably arranged on the inner top wall of the cleaning box (5), a sponge ring (18) is arranged on the inner side of the sleeve (17), and the measuring rope (3) is arranged through the sleeve (17).

8. A pile foundation hole depth measuring device according to claim 7, characterized in that a plurality of water leakage holes (19) are opened on the lower side of the cleaning box (5).