CN212482437U

CN212482437U - Hole bottom sediment thickness detection device after secondary hole cleaning during cast-in-place pile construction

Info

Publication number: CN212482437U
Application number: CN202021384351.4U
Authority: CN
Inventors: 苏宝; 周坚; 邹盛武; 金哲; 夏川
Original assignee: Zhongdi Junhao Hi Tech Co ltd
Current assignee: Zhongdi Junhao Hi Tech Co ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2021-02-05
Anticipated expiration: 2030-07-14

Abstract

The utility model discloses a hole bottom sediment thickness detection device after secondary hole cleaning during cast-in-place pile construction, which comprises a reinforcement cage placed in a pile hole and a conduit inserted into a central hole of the reinforcement cage, and the device also comprises a measuring rope driven by a winch; the lower end of the measuring rope is suspended with a measuring part, the measuring part comprises a weight part and a pressing plate, the upper end of the pressing plate is provided with a plurality of vertical guide rods, the top end of each guide rod is provided with an expanding head, the lower end of the weight part is provided with guide cylinders corresponding to the guide rods one by one, each guide rod passes through the lower opening of the guide cylinder, the expanding head of each guide rod is in sliding fit in the cavity of the guide cylinder, and the lower opening of each guide cylinder is inwards provided with a limiting ring for clamping the expanding head in a protruding mode; the distance sensor used for measuring the distance between the expansion head and the top wall of the corresponding guide cylinder cavity is arranged on the expansion head; the width of the weight part and the width of the pressure plate are both smaller than the inner diameter of the conduit. The detection device does not need to pull up the guide pipe and hook the steel reinforcement cage in the detection process, and has high measurement precision and small error.

Description

Hole bottom sediment thickness detection 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 detecting 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 measuring 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 testing process need not to pull up the pipe, also can not hook steel reinforcement cage, and the clear hole back hole bottom sediment thickness detection 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 detection 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 device also comprises a measuring rope driven by a winch; the lower end of the measuring rope is suspended with a measuring part, the measuring part comprises a weight part and a pressing plate, the upper end of the pressing plate is provided with a plurality of vertical guide rods, the top end of each guide rod is provided with an expanding head, the lower end of the weight part is provided with guide cylinders corresponding to the guide rods one by one, each guide rod passes through the lower opening of the guide cylinder, the expanding head of each guide rod is in sliding fit in the cavity of the guide cylinder, and the lower opening of each guide cylinder is inwards provided with a limiting ring for clamping the expanding head in a protruding mode; the distance sensor used for measuring the distance between the expansion head and the top wall of the corresponding guide cylinder cavity is arranged on the expansion head; the width of the weight part and the width of the pressure plate are both smaller than the inner diameter of the conduit.

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

The working process of the device is as follows: firstly, calculating the length of the pay-off, wherein the length of the pay-off is obtained by subtracting the height of the measuring part when the measuring part is completely extended from the design depth of the hole bottom, and if the depth of the hole bottom is 50 meters and the height of the measuring part when the measuring part is completely extended is 500mm, the length of the pay-off is 45.5 meters. The winch can accurately control the paying-off length to enable the actual paying-off length to reach a target value of 45.5 meters, at the moment, if the thickness of sediment at the bottom of a hole is 0, the pressing plate is placed at the bottom of the hole of the drilled hole, the guide rod is static relative to the guide cylinder, and the distance between the expanding head and the top wall of the guide cylinder is not changed; however, in actual construction, sediment with a certain thickness is inevitably present at the bottom of the hole, so the top surface of the sediment is bound to support the pressing plate, and further the guide rod is driven to ascend relative to the guide cylinder, so that the distance between the enlarged head and the top wall of the guide cylinder is reduced, and the distance sensor on the enlarged head can accurately measure the variable of the distance, namely the actual thickness of the sediment at the bottom of the 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; moreover, the volume and the height of the measuring part of the device are not large, and the catheter does not need to be pulled up, so that the time and the labor are saved; moreover, the device reasonably utilizes the lifting of the sediment to the pressing plate, and accurately acquires the variable of the height difference between the guide rod, the expansion head and the top wall of the guide cylinder through the pressure sensor, so as to accurately measure the thickness of the scum at the bottom of the hole of the drilled hole. 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, a support is arranged at the orifice of the pile hole, the winch is installed on the support, the support is provided with an overhanging beam, the rear end of the overhanging beam is rotatably provided with a rear fixed pulley, the front end of the overhanging beam is provided with a U-shaped notch, a front fixed pulley is arranged in the U-shaped notch, two horizontal long through holes are respectively arranged on two side walls of the U-shaped notch, a wheel shaft is jointly matched in the two long through holes in a sliding manner, and the front fixed pulley is installed on the wheel shaft; two transverse driving cylinders are respectively arranged on two side walls of the U-shaped notch, and piston rods of the two transverse driving cylinders are respectively fixed with two ends of the wheel shaft; the measuring rope is led out from the winch and then sequentially bypasses the rear fixed pulley and the front fixed pulley to be connected with the measuring part; like this, can utilize horizontal actuating cylinder, sideslip shaft, and then the position of adjusting preceding fixed pulley, just also realized the horizontal adjustment of measuring rope unwrapping wire point position for when the measuring part is transferred, be in the pipe center as far as possible, further ensure steady unwrapping wire.

Preferably, the number of the guide cylinders and the number of the guide rods are four, the four guide cylinders are uniformly distributed along the circumferential direction of the heavy hammer part, and the four guide rods are uniformly distributed along the circumferential direction of the pressing plate; therefore, the weight 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 weight part is a hollow cylindrical structure, an opening on the weight part is in threaded connection with a cover body, the cover body is provided with a lifting ring connected with the measuring rope, and a plurality of counterweight cakes are placed in a cylindrical cavity of the weight part; therefore, the counter weight of the weight part can be flexibly adjusted by increasing or decreasing the number of the counter weight cakes in the barrel cavity of the weight part, so that the counter weight is suitable for mud with different concentrations and specific gravities, the smooth downward placement of the mud is ensured, and the universality of the device is improved.

Preferably, the upper surface of the pressing plate is screwed with a plurality of counterweight rings, a counterweight cross is fixed in each counterweight ring, and the counterweight cross and the four guide rods are staggered; therefore, the number of the pressure rings can be flexibly increased or decreased, the balance weight of the pressure plate can be flexibly adjusted, the pressure plate can smoothly descend in slurry with different concentration and specific gravity, and the universality of the device is further improved.

Drawings

Fig. 1 is the utility model discloses clear hole back hole bottom sediment thickness detection device's of secondary during bored concrete pile construction structural schematic diagram.

Fig. 2 is the structure schematic diagram of the utility model discloses clear hole back hole bottom sediment thickness detection device of secondary during bored concrete pile construction after removing the testing section.

Fig. 3 is the utility model discloses clear hole back hole bottom sediment thickness detection device's during bored concrete pile construction half sectional structure schematic diagram of detection portion.

The measuring device comprises a winch 1, a measuring rope 2, a measuring rope 3, a weight part 4, a pressing plate 5, a guide rod 6, an enlarged head 7, a guide cylinder 8, a limiting ring 9, a support 10, a cantilever beam 11, a rear fixed pulley 12, a U-shaped notch 13, a front fixed pulley 14, a long through hole 15, a wheel shaft 16, a transverse driving cylinder 17, a cover body 18, a lifting ring 19, a counterweight cake 20, a counterweight ring 21, a counterweight cross frame 22 and a distance sensor.

Detailed Description

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

As shown in fig. 1-3, the utility model discloses hole bottom sediment thickness detection device after secondary clear hole during bored concrete pile construction, it is known by general knowledge including placing the steel reinforcement cage in the stake hole and inserting the pipe in the steel reinforcement cage central hole, and the pipe is fixed at the drilling drill way by the jacket.

The device also comprises a measuring line 2 driven by a hoisting machine 1. Specifically, a support 9 is arranged at the orifice of the pile hole, the winch 1 is installed on the bottom plate of the support 9, and a cantilever beam 10 is fixed on the bottom plate of the support 9 through a main mast. The rear end of the cantilever beam 10 is rotatably provided with a rear fixed pulley 11, the front end of the cantilever beam 10 is provided with a U-shaped gap 12, a front fixed pulley 13 is arranged in the U-shaped gap 12, two side walls of the U-shaped gap 12 are respectively provided with two horizontal long through holes 14, in other words, each side wall is provided with one long through hole 14; an axle 15 is jointly and slidably matched in the two long through holes 14, and the front fixed pulley 13 is arranged on the axle 15. Two lateral walls of the U-shaped notch 12 are respectively provided with two lateral driving cylinders 16, namely, each lateral wall is provided with one lateral driving cylinder 16; the piston rods of the two transverse driving cylinders 16 are respectively fixed with the two ends of the wheel shaft 15. The measuring rope 2 is led out from the winch 1, and then is connected with the measuring part by sequentially winding the rear fixed pulley 11 and the front fixed pulley 13. In this embodiment, the control of the paying-off length of the measuring rope 2 is generally implemented by installing a rotation angle encoder on an output shaft of a winch, and then deriving the linear velocity, that is, the paying-off length by measuring the angular velocity, and of course, the simplest method can be adopted, and scales are arranged on the measuring rope 2, so that the paying-off length is controlled.

The lower end of the measuring rope 2 is suspended with a measuring part which comprises a weight part 3 and a pressing plate 4. The upper end of the pressing plate 4 is provided with a plurality of vertical guide rods 5, in the embodiment, four guide rods 5 are arranged, and the four guide rods 5 are uniformly distributed along the circumferential direction of the pressing plate 4; the top end of each guide rod 5 is provided with an expansion head 6. The lower end of the weight part 3 is provided with guide cylinders 7 corresponding to the guide rods 5 one by one, in other words, four guide cylinders 7 are provided in the embodiment, and the four guide cylinders 7 are uniformly distributed along the circumferential direction of the weight part 3. Each guide rod 5 penetrates through the lower opening of one corresponding guide cylinder 7, the expansion head 6 of each guide rod 5 is in sliding fit with the cylinder cavity of the corresponding guide cylinder 7, and the opening of each guide cylinder 7 is inwards provided with a limiting ring 8 used for clamping the expansion head 6 to prevent the pressing plate 4 from falling. The distance sensor 22 for measuring the distance between the enlarged head 6 and the top wall of the cylinder cavity of the corresponding guide cylinder 7 is arranged on the enlarged head 6; the distance sensor 22 of the present embodiment is preferably an infrared sensor, and infrared rays are emitted upward and reflected by the top wall of the cylindrical cavity of the guide cylinder 7 to measure the distance between the enlarged head 6 and the top wall of the cylindrical cavity of the guide cylinder 7.

The width of the weight part 3 and the pressure plate 4 is smaller than the inner diameter of the conduit. Therefore, the whole measuring part can be retracted in the pipe cavity of the guide pipe and smoothly lowered, and the measuring part is not worried to be hooked with the steel reinforcement cage.

The weight part 3 is a hollow cylinder structure, the upper opening of the weight part 3 is connected with a cover body 17 in a threaded manner, the cover body 17 is provided with a lifting ring 18 connected with the measuring rope 2, and a plurality of weight cakes 19 are placed in the cylinder cavity of the weight part 3.

The upper surface of the pressure plate 4 is screwed with a plurality of counterweight rings 20, a counterweight cross 21 is fixed in each counterweight ring 20, and the counterweight rings 20 and the counterweight cross 21 on the same layer are integrated. The counterweight cross 21 is offset from the four guide rods 5.

Claims

1. The utility model provides a hole bottom sediment thickness detection device after secondary is clear when bored concrete pile is under construction, it is including placing the steel reinforcement cage in the stake hole and inserting the pipe in the steel reinforcement cage centre bore, its characterized in that: the device also comprises a measuring rope (2) driven by the winch (1); the lower end of the measuring rope (2) is suspended with a measuring part, the measuring part comprises a weight part (3) and a pressing plate (4), the upper end of the pressing plate (4) is provided with a plurality of vertical guide rods (5), the top end of each guide rod (5) is provided with an expansion head (6), the lower end of the weight part (3) is provided with guide cylinders (7) which correspond to the guide rods (5) one by one, each guide rod (5) penetrates through a lower opening of each guide cylinder (7), the expansion heads (6) of the guide rods (5) are in sliding fit in cylinder cavities of the guide cylinders (7), and a limiting ring (8) for clamping the expansion heads (6) is inwards protruded from the lower opening of each guide cylinder (7); the distance sensor (22) used for measuring the distance between the enlarged head (6) and the top wall of the cylinder cavity of the corresponding guide cylinder (7) is arranged on the enlarged head (6); the width of the weight part (3) and the width of the pressure plate (4) are both smaller than the inner diameter of the conduit.

2. The device for detecting 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: a support (9) is arranged at an orifice of a pile hole, a winch (1) is installed on the support (9), a cantilever beam (10) is arranged on the support (9), a rear fixed pulley (11) is rotatably installed at the rear end of the cantilever beam (10), a U-shaped notch (12) is formed in the front end of the cantilever beam (10), a front fixed pulley (13) is arranged in the U-shaped notch (12), two horizontal long through holes (14) are respectively formed in two side walls of the U-shaped notch (12), a wheel shaft (15) is jointly matched in the two long through holes (14) in a sliding mode, and the front fixed pulley (13) is installed on the wheel shaft (15); two lateral walls of the U-shaped notch (12) are respectively provided with two transverse driving cylinders (16), and piston rods of the two transverse driving cylinders (16) are respectively fixed with two ends of the wheel shaft (15); the measuring rope (2) is led out from the winch (1), and then sequentially rounds the rear fixed pulley (11) and the front fixed pulley (13) to be connected with the measuring part.

3. The device for detecting 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 cylinders (7) and the guide rods (5) are four, the four guide cylinders (7) are evenly distributed along the circumferential direction of the weight part (3), and the four guide rods (5) are evenly distributed along the circumferential direction of the pressing plate (4).

4. The device for detecting 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 weight part (3) is a hollow cylindrical structure, the upper opening of the weight part (3) is connected with a cover body (17) in a threaded manner, a lifting ring (18) connected with the measuring rope (2) is arranged on the cover body (17), and a plurality of counterweight cakes (19) are placed in a cylindrical cavity of the weight part (3).

5. The device for detecting 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 upper surface of the pressure plate (4) is connected with a plurality of counterweight rings (20) in a threaded manner, a counterweight cross (21) is fixed in each counterweight ring (20), and the counterweight cross (21) and the four guide rods (5) are staggered with each other.