CN114775611A - Construction method for sediment treatment and reinforcement of building pile foundation bottom - Google Patents

Construction method for sediment treatment and reinforcement of building pile foundation bottom Download PDF

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CN114775611A
CN114775611A CN202210433070.0A CN202210433070A CN114775611A CN 114775611 A CN114775611 A CN 114775611A CN 202210433070 A CN202210433070 A CN 202210433070A CN 114775611 A CN114775611 A CN 114775611A
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sediment
pile
drilling
pile foundation
data
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莫祥胜
郝希玺
莫威
舒玺
郝亮
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Guizhou Qiangsheng Basic Engineering Technology Co ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/08—Removing obstacles
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/10—Deep foundations
    • E02D27/12—Pile foundations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00—Testing foundations or foundation structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B45/00—Measuring the drilling time or rate of penetration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass

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  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Abstract

The invention discloses a construction pile foundation bottom sediment treatment and reinforcement construction method, relating to the technical field of construction pile foundations and comprising the following steps: s1: hole distribution and drilling: when drilling, ensuring constant-speed stable drilling, arranging a monitoring device on the drilling machine, wherein a speed measuring system is arranged in the monitoring device, the speed measuring system comprises an accelerometer, the accelerometer is mainly used for collecting an acceleration signal of the drilling machine, judging whether steel bars in a pile are met, whether a gravel pile body and sediment occur or not according to an acceleration characteristic signal, and calibrating and judging the position of the pile body with relative problems; s2: proper high-pressure rotary spraying hole washing: s3: water lifting to remove slag and clean holes: s4: and (3) checking sediment treatment results: s5: preparing slurry: s6: high-pressure grouting: s7: and finally, core-pulling rechecking and static pressure load testing are carried out to check whether the pile foundation sediment treatment and reinforcement are qualified or not. The invention relates to a construction method for sediment treatment and reinforcement of the bottom of a building pile foundation, which has good sediment treatment effect and high pile foundation strength.

Description

Construction method for sediment treatment and reinforcement of building pile foundation bottom
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method for treating and reinforcing sediment at the bottom of a building pile foundation.
Background
The pile foundation is a common deep foundation form, which is composed of foundation piles and bearing platforms connected to the pile tops, if the pile bodies are completely buried in the soil, the bottom surfaces of the bearing platforms are in contact with the soil body, the pile foundation is called a low bearing platform pile foundation, if the upper parts of the pile bodies are exposed out of the ground and the bottom surfaces of the bearing platforms are located above the ground, the pile foundation is called a high bearing platform pile foundation, the building pile foundation is usually a low bearing platform pile foundation, and in the common high bearing platform pile foundation in bridge and wharf engineering, sediment or hole collapse is left in the processes of drilling and hole cleaning, sediment which is not taken away by circulating mud is called sediment, is generally coarse particles, and is usually required to be treated to ensure the quality of the pile foundations.
When most of the existing engineering teams carry out bottom cleaning operation of a pile foundation, at least three holes are generally uniformly drilled in the pile foundation needing bottom cleaning, and a water pump is used for spraying running water in the holes simultaneously to ensure that the sediment at the bottom of the pile foundation is punched thoroughly, but the complete pile bottom sediment treatment method can damage the structure of the pile foundation to a great extent, so that the structure of the pile foundation is unstable to influence the pile driving quality; when the pile bottom grouting operation is carried out, cement paste, cement mortar or fine stone concrete is poured into a sediment area of the pile bottom to fill up a space left after sediment is removed, but the expansion rates of the cement paste and the cement mortar are not large, and fine stones contained in the fine stone concrete can cause the blockage of a guide pipe, so that the efficiency and the quality of grouting work can be influenced by the three grouting methods, the required amount of the cement paste or the cement mortar is large, the cost is increased, the material is wasted, the sediment treatment and reinforcement construction method at the bottom of the existing building pile foundation exists.
The technical problem to be solved by the invention is as follows: the processing cost of the pile foundation with the problems is reduced to a greater extent; the method solves the problems that the sediment treatment is not thorough and the design strength requirement cannot be met after the sediment treatment, and therefore, the method for sediment treatment and reinforcement construction of the bottom of the building pile foundation is provided.
Disclosure of Invention
The invention mainly aims to provide a construction pile foundation bottom sediment treatment and reinforcement construction method, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that: the construction method for treating and reinforcing the sediment at the bottom of the building pile foundation comprises the following steps:
s1: hole distribution and drilling:
s101: hole distribution: taking the central point of the cross section of the pile head as a hole opening position, constructing a drill hole by using a drilling machine, and adjusting the vertical shaft angle of the drilling machine by using a plumb line or a leveling bubble before the drilling machine starts to ensure that the drilling direction is vertical to the horizontal plane, so that a drill bit can not drill to the periphery of the pile to damage a pile body during drilling;
s102, drilling: when drilling, ensuring constant-speed stable drilling, keeping the drilling speed at 60 r/min, arranging a monitoring device on the drilling machine, wherein the monitoring device is internally provided with a speed measuring system and a processing system, the speed measuring system comprises an accelerometer, a microprocessor, a wireless communication module, a clock chip, a data storage module and a power management module, the accelerometer is fixed in the monitoring device and is mainly used for collecting acceleration signals of the drilling machine, the microprocessor is mainly used for preprocessing electric signals generated by the accelerometer and then storing the processed acceleration signals in the data storage module in real time by combining the clock chip, the wireless communication module transmits data in the data storage module to the processing system in real time, the processing system comprises a processing module and a memory learning module, the processing module acquires data in the data storage module and then performs acceleration data analysis, wherein in the analysis process, firstly, according to whether the acceleration signal has a sudden change, the acceleration sudden change signal is directly marked as a speed characteristic signal, whether the drilling speed is artificially increased or decreased is judged according to the acceleration characteristic signal, then the acceleration characteristic signal is recorded, integral operation is performed according to the acceleration characteristic signal and clock chip data to acquire the drilling speed and the drilling depth displacement, whether steel bars in the pile meet or a broken stone pile body or sediment occurs is judged, and the position of the pile body with a relative problem is judged by calibration;
s2, adapting to high-pressure rotary spraying and washing holes:
the pressure in the hole washing process is kept at 3.5-4MPa, the drill bit rotates at a constant speed, the drill rod moves up and down, the rotating speed of the drill bit is 40 revolutions per minute, the moving speed of the drill bit up and down is 6 cm per minute, the port returning water turbidity condition is observed at any moment in the rotary hole washing process, and then the sediment washing condition is judged, the most important of the step is that the pressure in the hole washing process is proper, part of sediment fragments cannot be washed out due to too low pressure, and the pile body is easily damaged due to too high pressure;
s3: water lifting to remove slag and clean holes:
discharging sediments by using the buoyancy of water in the process of rotary spraying and hole washing;
s4: and (3) checking a sediment treatment result:
checking the sediment cleaning condition through high-definition photography underwater, if the sediment cleaning condition is incomplete, returning to S2, standing for 12h after hole washing is completed to clarify stagnant water in the hole, then carrying out underwater high-definition photography to check the sediment cleaning condition, and if the sediment cleaning condition is incomplete, returning to S2 until the sediment is completely cleaned, and after the sediment is cleaned, better ensuring the later stage grouting consolidation effect, and further ensuring the intensity of the pile foundation sediment after treatment;
s5: preparing slurry:
grouting cement paste according to the concrete strength condition of the pile body, preparing P.O42.5R cement or P.O52.5R cement according to the water-cement ratio of 0.4-0.5, and adding one thousandth of efficient water reducing agent and one thousandth of expanding agent of the weight of the cement according to the required amount of the cement paste, so that the prepared cement paste requires that the strength after pile-forming solidification is greater than the concrete strength of the pile body;
s6: high-pressure grouting:
the method comprises the following steps of putting a rotary jet pipe into the pile bottom, carrying out rotary jet grouting, ensuring that the rotation speed is 30 revolutions per minute and the lifting speed is 6 cm per minute, carrying out rotary jet grouting until the concentration of cement slurry reflected from an orifice is consistent with that of injected slurry, and stopping grouting so as to stir and mix particulate matters precipitated at the pile bottom, wherein the cement slurry has relatively higher density and larger buoyancy, and the particulate matters can be well suspended and wrapped until solidification;
s7: and finally, core-pulling rechecking and static pressure load testing are carried out to check whether the pile foundation sediment treatment and reinforcement are qualified or not.
Preferably, the accelerometer adopts an AKE329B-MEMS digital accelerometer for measuring the acceleration of the drilling machine and converting the acceleration into an electric signal, and then the electric signal is sent to the microprocessor for processing and analysis through a transceiver chip with the model of RS485, the microprocessor adopts a mainboard with the specific model of STM32, the wireless communication module adopts a WIFI module, is connected with the microprocessor and receives and sends instructions between the wireless communication module and the processing system to realize information interaction with the microprocessor, the clock chip is an ISL1208 chip, the clock chip is connected with the microprocessor to provide a clock signal and a timing function required by the operation of the microprocessor, and the data storage module adopts a chip, is connected with the microprocessor and stores the acquired data.
In the step S1, in the process of integrating the acceleration characteristic signal, integration operation is performed in two ways, the first way is to directly perform integration in the time domain, perform detrending processing on the integrated result, and the second way is to perform integration in the frequency domain, perform frequency domain integration by using an omega algorithm, and finally obtain speed data and displacement data.
Preferably, the first is directly in the time domainThe line integration process is as follows, capturing the starting instant t of the speed variation1And the instant t of the end2And the acceleration a is used to know the acceleration starting speed v1Speed v at rest of drilling machine20, obtained from the relationship between speed and distance s
Figure BDA0003611676550000041
Can be pushed to
Figure BDA0003611676550000042
Finally push to
Figure BDA0003611676550000043
Preferably, the second is integration in the frequency domain, as follows, the measured acceleration am(t) discretization into a discrete acceleration array a of length Nm(n), performing discrete Fourier transform to obtain a transformed frequency domain complex sequence am(k) And corresponding frequency fkThe following were used:
Figure BDA0003611676550000044
in the formula f0Is the sampling frequency, (1 ≦ k ≦ N), am(k) Corresponding acceleration inter-harmonic am(t)kCan be expressed as:
Figure BDA0003611676550000045
amplitude A of acceleration simple harmonic wavekDegree of circumference
Figure BDA0003611676550000046
Initial phase angle
Figure BDA0003611676550000047
The following were used:
Figure BDA0003611676550000048
Figure BDA0003611676550000051
to pair
Figure BDA0003611676550000052
The result of the integration is taken into account,
Figure BDA0003611676550000053
amplitude A of the velocity simple harmonicvkCircumferential ratio
Figure BDA0003611676550000054
Initial phase angle
Figure BDA0003611676550000055
The following:
Figure BDA0003611676550000056
Figure BDA0003611676550000057
for is to
Figure BDA0003611676550000058
2-fold integration is performed, and the amplitude A of the cosine form of the displacement simple harmonic waveskDegree of circumference
Figure BDA0003611676550000059
Initial phase angle
Figure BDA00036116765500000510
The following:
Figure BDA00036116765500000511
the trend term in the test is mainly distributed in the low frequency band, and a function is introduced for controlling the error generated by the low frequency part signal
Figure BDA00036116765500000512
By controlling the integration process, the displacement s (t) can be expressed as:
Figure BDA00036116765500000513
in the formula: -F-1(…) is the inverse Fourier transform and F (…) is the Fourier transform, function
Figure BDA00036116765500000514
Wherein a low frequency f is selectedTThe low cut-off integration algorithm will be lower than the low cut-off frequency fTThe amplitude of the acceleration signal is set to zero, and the low-frequency attenuation integration algorithm is lower than the low-frequency cut-off frequency fTThe acceleration signal is attenuated to a certain degree, acceleration data integration is carried out through two modes, accuracy of integral operation speed is improved, whether the speed of the drilling machine is within a control range or not can be monitored in real time, a data processing effect is improved, and monitoring accuracy is improved.
Preferably, in step S1, the memory learning module first obtains data in the data storage module, result data of steel bars in the pile or broken stone pile body or sediment, and position data of the pile body with relative problems, the memory learning module performs feature matching on the three groups of data, performs feature analysis, constructs a neural network model, performs deep learning on the feature data through the neural network model, continuously adjusts parameters of the neural network model, performs result verification to finally obtain a neural network prediction judgment model, performs result prediction on acceleration feature data in the processing module through the neural network prediction judgment model to assist in judging whether the pile body corresponding position meets steel bars in the pile, whether broken stone pile body and sediment occur, sets the neural network prediction model, and performs judgment according to the data measured by the accelerometer through the neural network prediction model, whether broken stone or steel bars are broken at the corresponding position of the pile body or not is judged, the judgment speed is increased, and the precision of analysis and processing is improved.
Preferably, in step S3, the slag is removed by a water lift circulation method, water is injected into the internal channel of the drill rod, the outside water lift returns the slag, the nozzle rotates and moves up and down to clean the cut mud, sand and stone out of the pile, so as to complete cleaning, ensure that the bottom of the pile foundation and the inside of the drilled hole have mud and sediment, and ensure the strength of the pile foundation after high-pressure grouting reinforcement.
Preferably, in step S4, the cleaning condition of the sediments is inspected through high-definition photography underwater, the camera is used for observing videos in the high-definition hole and is placed in the drill hole for image shooting, after shooting is completed, the camera is withdrawn, and the videos of the sediments in the drill hole can be shot more clearly through the video observation camera in the high-definition hole.
Preferably, in step S7, the core-pulling rechecking is performed on the treated pile foundation 3 days after grouting is completed, the consolidation and compaction condition of the slurry is detected, the static pressure load test is a mechanical test, the mechanical strength of the pile foundation is detected by the mechanical test after 28 days of curing time is reached, the construction requirement is met after the mechanical strength is detected to be qualified, and in actual use, the strength of the pile foundation subjected to sediment treatment and reinforcement by the method is qualified after the pile foundation is detected.
Compared with the prior art, the invention has the following beneficial effects:
1. the processing method has little influence on the original pile body, only a coring hole with the diameter of 9cm is drilled from the center of the pile, and the real situation of the defective part can be intuitively reflected through hole washing and high-definition photography in the hole.
2. The construction period is short, the construction can be finished in 6-7 working days for a single pile foundation, and compared with direct pouring of waste piles, a large amount of time is saved.
3. Low cost, obvious effect and no damage to pile body and pile body reinforcing steel bars. The cost of treating by the method is about 1/5-1/20 of the newly cast pile, and the cost is greatly saved.
4. The detection is convenient, and the core can be pulled through the drilling after 3 days after the grouting is finished for rechecking, so that the detection efficiency is improved, and the detection is more convenient.
5. The quality of the grouting material after multiple experiments is guaranteed, and the mechanical strength of the grouting material can completely meet the design requirements through experiments on pressure, tension, shearing force and the like of a core sample.
6. Through setting up detection device on the rig, speed measurement system is established in detection device, use speed measurement system to carry out real-time supervision to rig drilling speed, accelerometer data takes place the sudden change in speed measurement system, time microprocessor marks this sudden change signal sign as characteristic signal, processing system is according to characteristic signal, and then judge whether meet in the stake reinforcing bar or rubble pile body or sediment appear, replace artifical observation rig falling speed whether appear non-artificial fast or slow down, than artifical observation, it is more accurate to monitor, make and handle inside sediment more thorough, excellent in use effect.
Drawings
FIG. 1 is a flow chart of the construction method for sediment treatment and reinforcement of the bottom of the building pile foundation;
FIG. 2 is a system block diagram of a speed measurement system and a processing system in the construction method for treating and reinforcing the sediment at the bottom of the building pile foundation.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Referring to fig. 1-2, the invention relates to a construction method for treating and reinforcing sediment at the bottom of a building pile foundation, which comprises the following steps:
s1: hole distribution and drilling:
s101: hole distribution: taking the central point of the cross section of the pile head as a hole opening position, constructing a drill hole by using a drilling machine, and adjusting the vertical shaft angle of the drilling machine by using a plumb line or a leveling bubble before the drilling machine starts to ensure that the drilling direction is vertical to the horizontal plane, so that a drill bit can not drill to the periphery of the pile to damage a pile body during drilling;
s102, drilling: when drilling, a specific drilling machine is used to drill a drill hole with the diameter of 9cm, the drilling speed is kept at 60 r/min, a monitoring device is arranged on the drilling machine, a speed measuring system and a processing system are arranged in the monitoring device, the speed measuring system comprises an accelerometer, a microprocessor, a wireless communication module, a clock chip, a data storage module and a power management module, the accelerometer is fixed in the monitoring device and is mainly used for collecting acceleration signals of the drilling machine, the microprocessor is mainly used for preprocessing electric signals generated by the accelerometer and then storing the processed acceleration signals in the data storage module in real time by combining the clock chip, the wireless communication module transmits data in the data storage module to the processing system in real time, the processing system comprises a processing module and a memory learning module, the processing module acquires data in the data storage module and then performs acceleration data analysis, wherein in the analysis process, firstly, according to whether the acceleration signal has sudden change, the acceleration sudden change signal is directly marked as a speed characteristic signal, and whether the drilling speed is artificially increased or reduced is judged according to the acceleration characteristic signal, then the acceleration characteristic signal is recorded, integral operation is performed according to the acceleration characteristic signal and clock chip data to acquire the drilling speed and the drilling depth displacement, so that whether steel bars in a pile meet or a gravel pile body or sediment occurs is judged, and the position of the pile body with relative problems is judged by calibration;
s2, adapting to high-pressure rotary spraying and hole washing:
the pressure in the hole washing process is kept at 3.5-4MPa, the drill bit rotates at a constant speed, the drill rod moves up and down, the rotating speed of the drill bit is 40 revolutions per minute, the moving speed of the drill bit up and down is 6 centimeters per minute, the condition of returned water turbidity of the hole opening is observed at any moment in the rotary spraying hole washing process, and then the sediment washing condition is judged, wherein the most important of the step is that the pressure in the hole washing process is proper, partial sediment fragments cannot be washed away due to too low pressure, and the pile body is easily damaged due to too high pressure;
s3: water lifting to remove slag and clean holes:
discharging sediments by using the buoyancy of water in the process of rotary spraying and washing the holes;
s4: and (3) checking sediment treatment results:
checking sediment cleaning conditions through high-definition photography underwater, returning to S2 if sediment cleaning is incomplete, standing for 12 hours after hole cleaning is completed to clarify stagnant water in holes, then checking sediment cleaning conditions through underwater high-definition photography, returning to S2 if sediment cleaning is incomplete until sediment is completely cleaned, and better ensuring later grouting consolidation effect after sediment cleaning is completed, thereby ensuring the strength of pile foundation sediment after treatment;
s5: preparing slurry:
grouting cement slurry according to the concrete strength condition of a pile body, preparing P.O42.5R cement or P.O52.5R cement according to the water-cement ratio of 0.4-0.5, and adding a one-thousandth high-efficiency water reducing agent and a one-thousandth expanding agent of the weight of the cement according to the required amount of the slurry, so that the strength of the prepared cement slurry after pile-forming solidification is required to be greater than the concrete strength of the pile body;
s6: high-pressure grouting:
the rotary spraying pipe is put into the pile bottom and is used for rotary spraying grouting, the rotating speed is guaranteed to be 30 revolutions per minute, the lifting speed is 6 centimeters per minute, the grouting is carried out in a rotary spraying mode until the concentration of the cement slurry which is back out of an orifice is consistent with the concentration of the injected slurry, and then the grouting is stopped, so that the purpose is to stir and mix the particles which are precipitated to the pile bottom, the density of the cement slurry is relatively higher, the buoyancy is also higher, and the particles can be suspended and wrapped to be solidified well;
s7: and finally, performing core-pulling rechecking and static pressure load test to check whether pile foundation sediment treatment and reinforcement are qualified or not.
The accelerometer adopts AKE329B-MEMS digital accelerometer, the acceleration of the driller is measured, and convert the acceleration into an electric signal, the transceiver chip of the model RS485 is sent to the microprocessor for processing and analysis, the microprocessor adopts a specific model STM32 type mainboard, the wireless communication module adopts a WIFI module, the wireless communication module is connected with the microprocessor, and receive and send instructions between the processing system, the information interaction with the microprocessor is realized, the clock chip is an ISL1208 chip, the clock chip is connected with the microprocessor, the clock signal and the timing function required by the operation of the microprocessor are provided, the data storage module adopts a chip, the data storage module is connected with the microprocessor, and the collected data are stored.
In the step S1, in the process of integrating the acceleration characteristic signal, integration operation is performed in two ways, the first way is to perform integration directly in the time domain, and then perform detrending processing on the integration result, the second way is to perform integration in the frequency domain, and perform frequency domain integration by using an omega algorithm, and finally obtain speed data and displacement data.
The first is to perform the integration process directly in the time domain as follows, capturing the starting moment diagram t of the speed variation1And the instant t of the end2And the speed v of the acceleration starting is obtained by the acceleration a1Speed v at rest of the drilling machine20, from the relationship between speed and distance s
Figure BDA0003611676550000101
Can be pushed to
Figure BDA0003611676550000102
Finally push to
Figure BDA0003611676550000103
The second method is to perform an integration process in the frequency domain as follows, and the acceleration a obtained by the test is measuredm(t) discretization into a discrete acceleration array a of length Nm(n) performing discrete Fourier transform to obtain a transformed frequency domain complex sequence am(k) And a corresponding frequency fkThe following:
Figure BDA0003611676550000104
in the formula f0Is the sampling frequency (k is more than or equal to 1 and less than or equal to N), am(k) Corresponding acceleration inter-harmonic am(t)kCan be expressed as:
Figure BDA0003611676550000105
amplitude A of acceleration simple harmonic wavekDegree of circumference
Figure BDA0003611676550000106
Initial phase angle
Figure BDA0003611676550000107
The following:
Figure BDA0003611676550000108
Figure BDA0003611676550000109
to pair
Figure BDA00036116765500001010
The result of the integration is taken into account,
Figure BDA00036116765500001011
amplitude A of the velocity simple harmonicvkCircumferential ratio
Figure BDA00036116765500001012
Initial phase angle
Figure BDA00036116765500001013
The following were used:
Figure BDA00036116765500001014
Figure BDA00036116765500001015
to pair
Figure BDA00036116765500001016
Carry out 2 integrations forCosine form of displacement simple harmonic, amplitude A thereofskCircumferential ratio
Figure BDA00036116765500001017
Initial phase angle
Figure BDA00036116765500001018
The following:
Figure BDA00036116765500001019
the trend term in the test is mainly distributed in the low frequency band, and a function is introduced for controlling the error generated by the signal of the low frequency part
Figure BDA0003611676550000111
By controlling the integration process, the displacement s (t) can be expressed as:
Figure BDA0003611676550000112
in the formula: -F-1(…) is the inverse Fourier transform and F (…) is the Fourier transform, function
Figure BDA0003611676550000113
Wherein a low frequency f is selectedTThe low cut-off integration algorithm will be below the low cut-off frequency fTThe amplitude of the acceleration signal is set to zero, and the low-frequency attenuation integration algorithm is lower than the low-frequency cut-off frequency fTThe acceleration signal of (a) is attenuated to some extent.
Wherein, the memory learning module in step S1 firstly obtains data in the data storage module, result data of steel bars in the pile or broken stone pile body or sediment and position data of the pile body with relative problems, the memory learning module performs feature matching on the three groups of data, performs feature analysis to construct a neural network model, performs deep learning on the feature data through the neural network model, performs result verification by continuously adjusting parameters of the neural network model to finally obtain a neural network prediction judgment model, performs result prediction on acceleration feature data in the processing module through the neural network prediction judgment model to assist in judging whether the pile body corresponding position meets steel bars in the pile, whether broken stone pile body and sediment occur or not, sets the neural network prediction model, and performs judgment according to the data measured by the accelerometer through the neural network prediction model, whether broken stone or steel bars are broken at the corresponding position of the pile body or not is judged, the judgment speed is increased, and the precision of analysis and processing is improved.
In step S3, the slag is removed by a water lift circulation method, water is injected into an inner channel of the drill rod, the slag is returned by water lift on the outer side, the spray head rotates and moves up and down, cut mud, sand and stones are cleaned out of the pile, cleaning is completed, the bottom of the pile foundation and the inner part of the drilled hole are guaranteed to have silt and sediment, and the strength of the pile foundation after high-pressure grouting reinforcement is guaranteed.
Wherein, in step S4, pass through the high definition photography inspection sediment clearance condition under water, concrete step is, pass through the high definition photography inspection sediment clearance condition under water, and concrete step is, uses the downthehole video of high definition to observe the camera, carries out the image shooting in putting into the drilling, takes back the camera after the shooting is accomplished, observes the camera through the downthehole video of high definition and can more clearly shoot the inside sediment of drilling and handle the video.
In step S7, performing core-pulling rechecking on the pile foundation to detect the consolidation and compaction of the slurry after 3 days of grouting, performing a mechanical experiment to detect the mechanical strength after 28 days of curing, and checking to obtain the construction requirement.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The construction method for sediment treatment and reinforcement of the bottom of the building pile foundation is characterized in that: the method comprises the following steps:
s1: hole distribution and drilling:
s101: hole distribution: taking the center point of the cross section of the pile head as a hole opening position, constructing a drill hole by using a drilling machine, and adjusting the vertical shaft angle of the drilling machine by using a plumb line or a leveling bubble before the drilling machine is started to ensure that the drilling direction is vertical to the horizontal plane, so that a drill bit cannot drill to the reinforcing steel bars around the pile to damage the pile body during drilling;
s102, drilling: when drilling, the uniform and stable drilling is ensured, the drilling machine is drilled at a specific rotating speed, a monitoring device is arranged on the drilling machine, a speed measuring system and a processing system are arranged in the monitoring device, the speed measuring system comprises an accelerometer, a microprocessor, a wireless communication module, a clock chip, a data storage module and a power supply management module, the accelerometer is fixed in the monitoring device and is mainly used for collecting acceleration signals of the drilling machine, the microprocessor is mainly used for preprocessing electric signals generated by the accelerometer and then storing the processed acceleration signals in the data storage module in real time by combining the clock chip, the wireless communication module transmits data in the data storage module to the processing system in real time, the processing system comprises a processing module and a memory learning module, the processing module acquires data in the data storage module and then performs acceleration data analysis, wherein in the analysis process, firstly, according to whether the acceleration signal has a sudden change, the acceleration sudden change signal is directly marked as a speed characteristic signal, whether the drilling speed is artificially increased or decreased is judged according to the acceleration characteristic signal, then the acceleration characteristic signal is recorded, integral operation is performed according to the acceleration characteristic signal and clock chip data to acquire the drilling speed and the drilling depth displacement, whether the steel bars in the pile meet, whether the gravel pile body and the sediment occur is judged, and the position of the pile body with a relative problem is judged by calibration;
s2: and (3) carrying out high-pressure jet grouting and hole washing:
the pressure in the hole washing process is kept at 3.5-4MPa, the drill bit rotates at a constant speed, the drill rod moves up and down, the rotating speed of the drill bit is 40 revolutions per minute, the moving speed of the drill bit up and down is 6 centimeters per minute, the condition of returned water turbidity of the hole opening is observed at any moment in the process of rotary spraying hole washing, and then the condition of sediment washing is preliminarily judged;
s3: water lifting to remove slag and clean holes:
discharging sediments by using the buoyancy of water in the process of rotary spraying and hole washing;
s4: and (3) checking a sediment treatment result:
checking the sediment cleaning condition through high-definition photography underwater, if the sediment cleaning is not complete, returning to S2, standing for 12h after the hole cleaning is completed to clarify stagnant water in the hole, then carrying out the underwater high-definition photography to check the sediment cleaning condition, and if the sediment cleaning is not complete, returning to S2 until the sediment is completely cleaned;
s5: preparing slurry:
grouting cement slurry according to the concrete strength condition of a pile body, preparing P.O42.5R cement or P.O52.5R cement according to a water-cement ratio of 0.4-0.5, adding a one-thousandth high-efficiency water reducing agent and a one-thousandth expanding agent of the weight of the cement according to the required amount of the slurry, so that the strength of the prepared cement slurry after pile forming solidification is required to be greater than the concrete strength of the pile body, and performing cement slurry allocation according to the actual pile foundation design requirement, thereby reducing the pile foundation sediment treatment and the economic expense of unreinforcement while ensuring the quality of the pile foundation, reducing the economic expense and obtaining the optimal effect under proper resources;
s6: high-pressure grouting:
putting a rotary spraying pipe into the bottom of the pile and performing rotary spraying grouting, ensuring that the rotating speed is 30 revolutions per minute and the lifting speed is 6 centimeters per minute, performing rotary spraying grouting, and stopping grouting until the concentration of grout flowing back from an orifice is consistent with that of injected grout;
s7: and finally, core-pulling rechecking and static pressure load testing are carried out to check whether the pile foundation sediment treatment and reinforcement are qualified or not.
2. The building pile foundation bottom sediment treatment and reinforcement construction method as claimed in claim 1, wherein: the accelerometer adopts digital accelerometer for measure the acceleration of rig, and turn into the signal of telecommunication with it, and the rethread receiving and dispatching chip sends to microprocessor handles the analysis, microprocessor adopts the type mainboard of specific model, wireless communication module adopts the WIFI module, with microprocessor links to each other, and with receive and send the instruction between the processing system, realize with microprocessor's information interaction, the clock chip with microprocessor links to each other provides required clock signal of microprocessor operation and timing function, data storage module adopts the chip, with microprocessor links to each other, stores the data of gathering.
3. The building pile foundation bottom sediment treatment and reinforcement construction method as claimed in claim 1, characterized in that: in the step S1, in the process of integrating the acceleration characteristic signal, integration operation is performed in two ways, the first way is to directly perform integration in the time domain, then perform detrending processing on the integrated result, the second way is to perform integration in the frequency domain, perform frequency domain integration by using an omega algorithm, and finally obtain speed data and displacement data.
4. The building pile foundation bottom sediment treatment and reinforcement construction method as claimed in claim 1, characterized in that: in step S1, the memory learning module first obtains data in the data storage module, result data of steel bars in the pile or broken stone pile body or sediment, and position data of the pile body with relative problems, the memory learning module performs feature matching on the three groups of data, performs feature analysis, constructs a neural network model, performs deep learning on the feature data through the neural network model, continuously adjusts parameters of the neural network model, performs result verification, finally obtains a neural network prediction judgment model, performs result prediction on acceleration feature data in the processing module through the neural network prediction judgment model, and assists in judging whether the pile body corresponding position meets steel bars in the pile, and whether broken stone pile body and sediment occur.
5. The building pile foundation bottom sediment treatment and reinforcement construction method as claimed in claim 1, wherein: in the step S3, slag is removed by using a water lift circulation method, water is injected into the inner channel of the drill rod, the water lift on the outer side returns slag, the spray head rotates and moves up and down, and the cut mud, sand and stones are removed out of the pile.
6. The building pile foundation bottom sediment treatment and reinforcement construction method as claimed in claim 1, characterized in that: in the step S4, the cleaning condition of the sediment is checked through high-definition photography underwater, the specific step is to check the cleaning condition of the sediment through high-definition photography underwater, the specific step is to use a high-definition in-hole video to observe a camera, to put the camera into a drill hole for image shooting, and after the shooting is finished, the camera is withdrawn.
7. The building pile foundation bottom sediment treatment and reinforcement construction method as claimed in claim 1, characterized in that: in the step S7, the core-pulling rechecking is performed on the pile foundation after the grouting is completed for 3 days, the consolidation and compaction conditions of the slurry are detected, the static pressure load test is a mechanical test, the mechanical strength is detected by performing the mechanical test after the curing time reaches 28 days, and the construction requirements are met after the test is qualified.
CN202210433070.0A 2022-04-24 2022-04-24 Construction method for sediment treatment and reinforcement of building pile foundation bottom Pending CN114775611A (en)

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