CN212896513U - Hole bottom sediment thickness measuring device after secondary hole cleaning during cast-in-place pile construction - Google Patents

Abstract

The utility model discloses a hole bottom sediment thickness measuring device after secondary hole cleaning during cast-in-place pile construction, which comprises a conduit, a traction rope and a measuring part, wherein the measuring part comprises a power part and a pressing plate; the power part comprises a top plate, a shell and a hanging beam used for being hooked with a first limiting ring of the guide pipe; the hanging beam and the shell are both fixed with the top plate, the motor is arranged in the shell, an output shaft of the motor extends downwards out of the shell, a screw rod is fixed on the output shaft, the top plate is also provided with a vertical guide sleeve, and a second limiting ring is inwards protruded from the lower opening of the guide sleeve; a guide rod is movably sleeved in each guide sleeve, an expansion head used for clamping the second limiting ring is arranged at the upper end of each guide rod, and the lower end of each guide rod is fixed with the pressure plate; an internal thread sleeve with an upward opening is arranged on the pressing plate, and the lead screw is screwed with the internal thread sleeve; the pressure plate is also provided with a second pressure sensor for measuring resistance; the measuring device also includes a sensor for measuring the travel of the platen. The measuring device has high measuring precision.

Description

Hole bottom sediment thickness measuring device after secondary hole cleaning during cast-in-place pile construction

Technical Field

The utility model relates to a pile foundation construction equipment field specifically says a carry out the device that is used for measuring the hole bottom sediment thickness in stake hole after the clear hole step of secondary during bored concrete pile construction.

Background

The cast-in-place pile has the advantages of small disturbance to surrounding strata, strong adaptability, high bearing capacity, high construction speed and the like, and becomes the most common pile type in engineering foundations. The construction steps of the cast-in-place pile are approximately as follows: firstly, drilling holes by using drilling equipment such as a drilling machine and the like, simultaneously adopting slurry to protect the wall, drilling to the elevation of the bottom of the hole, then carrying out the first hole cleaning operation of positive circulation or reverse circulation, then lowering a reinforcement cage, then inserting a guide pipe downwards, carrying out the second hole cleaning operation of positive circulation or reverse circulation by using the guide pipe and slurry, and finally pouring concrete.

During the process of drilling and lowering the reinforcement cage, impurities such as gravel, sand, broken rocks, soil and the like can be generated by cutting of the drilling machine, scraping of the reinforcement cage and collapse of the hole wall, and the impurities can float in slurry to form scum or deposit at the bottom of the hole of the pile to form sediment. Therefore, the hole cleaning needs to be carried out twice, namely, the hole cleaning is carried out after the hole is drilled to the bottom of the hole, and the hole cleaning is carried out after the reinforcement cage is placed downwards. However, in actual construction, although hole cleaning is performed twice, a part of sediments always remain at the bottom of the hole, if the thickness of the sediments is not large, the influence is not large, but the bearing capacity of the pile end is reduced due to the overlarge thickness of the sediments, so that the normal operation of the engineering is influenced due to the overlarge settlement of the pile body after the pile body is loaded. Therefore, the domestic relevant specifications strictly limit the hole bottom sediment thickness of the cast-in-place pile, namely after the drilled hole reaches the designed depth and before the concrete is cast, the sediment thickness of the end-supported pile is not more than 50mm, the sediment thickness of the friction type pile is not more than 100mm, and the sediment thickness of the anti-pulling horizontal force pile is not more than 200 mm. Therefore, the detection of the thickness of the sediment at the bottom of the pile hole is an important measure for controlling the construction quality, the concrete can be poured only by determining that the thickness of the sediment at the bottom of the hole does not exceed the standard requirement, and otherwise, secondary cleaning operation is continued until the thickness of the sediment at the bottom of the hole meets the standard requirement.

In the prior art, two methods, namely a heavy hammer method and a resistivity method, are mainly used for detecting the thickness of the sediment at the bottom of the hole after secondary hole cleaning. The heavy hammer method is characterized in that a heavy hammer is hung on a traction rope, and a sediment interface is judged by means of manual hand feeling, so that the sediment thickness is obtained; the artificial error of above-mentioned mode is great, and measurement accuracy is too low, takes place the hook touching with the steel reinforcement cage easily when the weight is transferred moreover, is difficult for transferring. The resistivity method is measured by a sediment measuring instrument, and before measurement, a part of the guide pipe needs to be pulled up from the drilled hole to vacate the space for placing the sediment measuring instrument, so that the step of pulling up the guide pipe wastes time and labor, and the work efficiency is low; in addition, in the process of lowering the sediment measuring instrument, the resistivity probe of the measuring instrument is easy to hook on the steel reinforcement cage, and is difficult to lower; moreover, more importantly, the sediment contains multiple impurities such as gravel, sand, crushed rock, soil and the like, and the resistivity of different types of impurities is different, so that the measurement result of the resistivity method also has certain error.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a measurement process need not to pull up the pipe, also can not hook steel reinforcement cage, and the clear hole back hole bottom sediment thickness measurement device of secondary when measurement accuracy is high, the little bored concrete pile construction of error.

The technical solution of the utility model is that, a hole bottom sediment thickness measuring device after secondary hole cleaning during cast-in-place pile construction is provided, which comprises a reinforcement cage placed in a pile hole and a conduit inserted into a central hole of the reinforcement cage, and the measuring device also comprises a traction rope driven by a winch; the lower end of the traction rope is suspended with a measuring part, and the measuring part comprises a power part and a pressing plate; the widths of the power part and the pressure plate are both smaller than the inner diameter of the guide pipe;

a first limiting ring is arranged at the lower opening of the guide pipe and protrudes inwards;

the power part comprises a top plate, a shell and a hanging beam which is used for being hooked with the first limiting ring to limit the length of the pay-off line; the hanging beam is provided with a first pressure sensor used for judging whether the hanging beam is abutted against the first limiting ring; the hanging beam and the shell are both fixed with the top plate, and the top plate is provided with a hanging ring for connecting a traction rope; the motor is arranged in the shell, an output shaft of the motor extends out of the shell downwards, a screw rod is fixed on the output shaft, the top plate is also provided with a vertical guide sleeve, and a second limiting ring is arranged at the lower opening of the guide sleeve and protrudes inwards;

a guide rod is movably sleeved in each guide sleeve, an expansion head used for clamping the second limiting ring is arranged at the upper end of each guide rod, and the lower end of each guide rod is fixed with the pressure plate; an internal thread sleeve with an upward opening is arranged on the pressing plate, and the lead screw is screwed with the internal thread sleeve; the pressure plate is also provided with a second pressure sensor for measuring resistance;

the measuring device also includes a sensor for measuring the travel of the platen.

Compared with the prior art, the device for measuring the thickness of the sediment at the bottom of the hole after secondary hole cleaning during the construction of the cast-in-place pile with the structure has the following advantages.

The working process of the device is as follows: the winch is driven to pay off, the measuring part is placed down from the guide pipe until the measuring part is placed down to the bottom end of the guide pipe, at the moment, the first pressure sensor can sense that the hanging beam and the first limiting ring are abutted against each other and inform a main controller such as a PLC chip, the main controller can drive the motor, the measuring part essentially forms a ball screw pair, the pressing plate and the internal thread sleeve are rotors, the guide rod and the guide sleeve which are sleeved with each other form a telescopic guide rail with circumferential limitation, so that the motor rotates the screw rod to enable the pressing plate to descend stably, when the pressing plate is abutted against a hole bottom sediment interface, the pressing plate can be sensed accurately by the second pressure sensor and reported to the main controller, the motor is stopped, and the sensor for measuring the stroke of the pressing plate can accurately measure the specific stroke of the pressing plate, namely the telescopic height of the measuring part; and then, superposing the telescopic height of the measuring part, the original height of the measuring part and the length of the guide pipe to obtain the actual depth of the drilled hole, and subtracting the actual depth from the designed depth of the drilled hole to accurately obtain the actual thickness of the sediment at the bottom of the drilled hole.

According to the analysis, firstly, the whole width of the measuring device is smaller than that of the guide pipe, so that the measuring part can be placed in the inner cavity of the guide pipe to be placed downwards, and the measuring part cannot be hooked and touched with the reinforcement cage in the placing process, so that the placing is smooth and convenient; in addition, the two ends of the cross beam clamp the wall of the guide pipe in the lowering process, so that the measuring part can be ensured to be always positioned in the center of the guide pipe, the guide positioning is automatically carried out, and the paying-off stability is further improved; the volume and the height of the measuring part of the device are not large, so that the catheter does not need to be pulled up, and time and labor are saved; moreover, the motor is internally protected in the shell, so that direct contact with slurry is avoided, and the service life of the motor is ensured; in addition, the guide rod and the guide sleeve which are mutually sleeved form a guide rail of the ball screw pair, the guide rail is telescopic, and the screw rod and the internal thread sleeve are also telescopic, so that the overall height of the measuring part is effectively reduced; moreover, the measuring part substantially forms a ball screw pair, the movement precision is high, and the reaction of the second pressure sensor of the pressing plate is sensitive, so that the measuring precision is effectively improved, and the accuracy of the final sediment thickness measurement is further ensured. Therefore, accurate data support is provided for whether secondary cleaning construction is carried out subsequently or not, and the thickness of the sediment at the bottom of the hole is guaranteed to meet the standard requirement.

Preferably, the upper end of the expansion head is provided with an infrared distance sensor; like this, infrared distance sensor upwards launches the infrared ray, through the uide bushing roof reflection back, can accurately measure the decline volume of clamp plate, also is the flexible volume of measuring part, further ensures measuring result's accuracy, and the built-in protection of infrared distance sensor is at the closed uide bushing intracavity relatively, has completely cut off mud, ensures that the signalling is not disturbed.

As another preferred mode, the output shaft of the motor is provided with a rotation angle encoder; the encoder can accurately know the rotating angle of the lead screw and send the rotating angle to the main controller, so that the rotating angle is converted into the height of the rotor, namely the descending height of the pressing plate, and the measurement is accurate.

Preferably, the number of the guide sleeves and the guide rods is two, the two guide sleeves are uniformly distributed along the circumferential direction of the top plate, and the two guide rods are uniformly distributed along the circumferential direction of the pressing plate; therefore, the power part and the pressing plate are firmly connected, the stress is balanced, the relative lifting is smooth and stable, and the accuracy of the measuring result is further improved.

Preferably, the first limiting ring is provided with two thrust blocks for blocking the rotation of the hanging beam, one thrust block is positioned on the left side of the front end of the hanging beam, and the other thrust block is positioned on the right side of the rear end of the hanging beam; the motive of this design is analyzed earlier, the couple hook is hung on first spacing ring, because the frictional force that the dead weight leads to, the rotatory reaction force of motor can be lost in the normal condition offset down, but under some unexpected situation, the motor still exists and receives the rotatory situation of reaction force, so set up the thrust block on first spacing ring, even if the motor drives the couple and takes place the reversal, also can firmly be supported by the thrust block after reversing half a circle at most, support, resist, prevent, ensure whole measuring part operation reliable and stable, and then guarantee measurement accuracy.

Drawings

Fig. 1 is the structure schematic diagram of the device for measuring the thickness of the secondary hole bottom sediment after hole cleaning during the construction of the cast-in-place pile.

Fig. 2 is the structure schematic diagram of the measuring part of the secondary hole bottom sediment thickness measuring device after hole cleaning during cast-in-place pile construction.

Fig. 3 is the utility model discloses clear hole back hole bottom sediment thickness measurement device's of secondary during bored concrete pile construction measurement portion installs the semi-section structure sketch at the pipe tail section.

Fig. 4 is the structure schematic diagram seen from the oblique overlooking direction of the conduit tail section of the secondary hole-cleaning back-hole sediment thickness measuring device during the construction of the cast-in-place pile.

The device comprises a guide pipe 1, a guide pipe 2, a winch 3, a traction rope 4, a power part 4.1, a top plate 4.2, a shell 4.3, a hanging beam 5, a pressing plate 6, a first limiting ring 7, a hanging ring 8, a motor 9, a lead screw 10, a guide sleeve 11, a second limiting ring 12, a guide rod 13, an expansion head 14, an internal thread sleeve 15 and a thrust block.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

As shown in fig. 1-4, the utility model discloses hole bottom sediment thickness measurement device after secondary clear hole during bored concrete pile construction, it is including placing the steel reinforcement cage in the stake hole and inserting the pipe 1 in the steel reinforcement cage centre bore, can know by common knowledge, and pipe 1 is fixed in the stake hole drill way through the jacket, and pipe 1 length can know, so measure the height that pipe 1 stretches out the height of stake hole part just can the accurate height that obtains pipe 1 bottom.

The measuring device also comprises a traction rope 3 driven by the winch 2; the lower end of the traction rope 3 is suspended with a measuring part, and the measuring part comprises a power part 4 and a pressing plate 5; the width of the power section 4 and the pressure plate 5 are both smaller than the inner diameter of the conduit 1. In other words, the maximum width of the power section 4 and the pressure plate 4 is smaller than the inner diameter of the normal section of the guide tube 1, i.e., the section excluding the bottom end, so that the measurement section can be easily put into the guide tube 1 to be lowered.

The lower opening of the guide pipe 1 is provided with a first limiting ring 6 which protrudes inwards. The power part 4 comprises a top plate 4.1, a shell 4.2 and a hanging beam 4.3 which is used for hooking with a first limit ring 6 to limit the pay-off length; the hanging beam 4.3 is provided with a first pressure sensor used for judging whether the hanging beam abuts against the first limiting ring 6. The widths of other parts except the hanging beam 4.3 in the power part 4 are smaller than the inner diameter of the first limiting ring 6, and the outer diameter of the pressure plate 5 is also smaller than the inner diameter of the first limiting ring 6. The first limiting ring 6 hooks the hanging beam 4.3 to prevent the measuring part from descending. The first pressure sensor is arranged on the lower surface of the suspension beam 4.3. Two thrust blocks 15 used for blocking the rotation of the hanging beam 4.3 are arranged on the first limiting ring 6, one thrust block 15 is positioned on the left side of the front end of the hanging beam 4.3, and the other thrust block 15 is positioned on the right side of the rear end of the hanging beam 4.3.

The hanging beam 4.3 and the shell 4.2 are both fixed with the top plate 4.1, namely the shell 4.2 is fixed on the lower surface of the top plate 4.1 and the hanging beam 4.3 is fixed on the upper surface of the top plate 4.1. A hanging ring 7 for connecting the traction rope 3 is arranged on a hanging beam 4.3 of the top plate 4.1; the motor 8 is arranged in the shell 4.2, an output shaft of the motor 8 downwards extends out of the shell 4.2 through a center hole of a bottom plate of the shell 4.2, a screw rod 9 is fixed on the output shaft, the top plate 4.1 is further provided with two vertical guide sleeves 10, the two guide sleeves 10 are evenly distributed along the circumferential direction of the top plate 4.1, and a second limiting ring 11 is arranged on the lower opening of each guide sleeve 10 and protrudes inwards.

A guide rod 12 is movably sleeved in each guide sleeve 10, an enlarged head 13 used for clamping the second limiting ring 11 is arranged at the upper end of each guide rod 12, and the lower end of each guide rod 12 is fixed with the pressure plate 5; specifically, the number of the guide rods 12 is two, and the two guide rods 12 are uniformly distributed along the circumferential direction of the pressure plate 5. An internal thread sleeve 14 with an upward opening is arranged in the center of the pressure plate 5, and the screw rod 9 is screwed with the internal thread sleeve 14; the pressure plate 5 is further provided with a second pressure sensor for measuring the resistance. The reading of the second pressure sensor will change significantly when the pressure plate 5 is in contact with the bottom hole sludge interface.

The measuring device also comprises a sensor for measuring the stroke of the pressure plate 5. The stroke sensor in the present embodiment is preferably an infrared distance sensor disposed at the upper end of the enlarged head 13; of course, a rotational angle encoder provided on the output shaft of the motor 8 may also be employed.

As is known in the art, the measuring device of the present application is further provided with a main controller, such as a PLC chip, which is in signal connection with the first pressure sensor, the second pressure sensor, the motor 8, and the sensor for measuring the stroke of the pressure plate 5.

Claims (5)

1. The utility model provides a hole bottom sediment thickness measurement device after secondary is clear in during bored concrete pile construction, it is including placing in the downthehole steel reinforcement cage of stake and inserting pipe (1) in the steel reinforcement cage centre bore, its characterized in that: the measuring device also comprises a traction rope (3) driven by the winch (2); the lower end of the traction rope (3) is suspended with a measuring part, and the measuring part comprises a power part (4) and a pressing plate (5); the widths of the power part (4) and the pressure plate (5) are both smaller than the inner diameter of the conduit (1);

a first limiting ring (6) is arranged at the lower opening of the guide pipe (1) and protrudes inwards;

the power part (4) comprises a top plate (4.1), a shell (4.2) and a hanging beam (4.3) which is used for being hooked with the first limiting ring (6) to limit the pay-off length; a first pressure sensor used for judging whether the hanging beam (4.3) is abutted against the first limiting ring (6) or not is arranged on the hanging beam; the hanging beam (4.3) and the shell (4.2) are both fixed with the top plate (4.1), and the top plate (4.1) is provided with a hanging ring (7) used for connecting the traction rope (3); a motor (8) is arranged in the shell (4.2), an output shaft of the motor (8) extends downwards out of the shell (4.2) and is fixedly provided with a lead screw (9), the top plate (4.1) is also provided with a vertical guide sleeve (10), and a second limiting ring (11) is inwards protruded at the lower opening of the guide sleeve (10);

a guide rod (12) is movably sleeved in each guide sleeve (10), an expansion head (13) used for clamping a second limiting ring (11) is arranged at the upper end of each guide rod (12), and the lower end of each guide rod (12) is fixed with the pressure plate (5); an internal thread sleeve (14) with an upward opening is arranged on the pressure plate (5), and the screw rod (9) is screwed with the internal thread sleeve (14); the pressure plate (5) is also provided with a second pressure sensor for measuring resistance;

the measuring device also comprises a sensor for measuring the stroke of the pressure plate (5).

2. The device for measuring the thickness of the sediment at the bottom of the hole after secondary hole cleaning in the cast-in-place pile construction according to claim 1, characterized in that: an infrared distance sensor is arranged at the upper end of the expansion head (13).

3. The device for measuring the thickness of the sediment at the bottom of the hole after secondary hole cleaning in the cast-in-place pile construction according to claim 1, characterized in that: an output shaft of the motor (8) is provided with a rotation angle encoder.

4. The device for measuring the thickness of the sediment at the bottom of the hole after secondary hole cleaning in the cast-in-place pile construction according to claim 1, characterized in that: the guide sleeves (10) and the guide rods (12) are two, the two guide sleeves (10) are uniformly distributed along the circumferential direction of the top plate (4.1), and the two guide rods (12) are uniformly distributed along the circumferential direction of the pressing plate (5).

5. The device for measuring the thickness of the sediment at the bottom of the hole after secondary hole cleaning in the cast-in-place pile construction according to claim 1, characterized in that: two thrust blocks (15) used for blocking the rotation of the hanging beam (4.3) are arranged on the first limiting ring (6), one thrust block (15) is located on the left side of the front end of the hanging beam (4.3), and the other thrust block (15) is located on the right side of the rear end of the hanging beam (4.3).

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