Cast-in-situ bored pile foundation quality control system based on pebble stratum

Abstract

The invention belongs to the technical field of cast-in-situ bored pile foundation quality control, and relates to a cast-in-situ bored pile foundation quality control system based on a pebble stratum. According to the method, the construction basic data of the cast-in-situ bored pile of the pebble stratum is analyzed, the proper construction basic data is selected according to the characteristics of the current pebble stratum, it is ensured that the quality of a pile foundation meets the design requirement, and the safety and stability of engineering are guaranteed; the construction scheme is dynamically adjusted and optimized according to the real-time detection data and the quality evaluation result by analyzing the quality evaluation index of the pebble stratum in each construction process of the cast-in-situ bored pile and the quality evaluation index of the whole construction process, it is ensured that each step of construction meets the design requirement and the quality standard, and the construction efficiency is improved. Corresponding construction control is carried out on the target pebble stratum in each construction process of the cast-in-situ bored pile, the construction quality condition is fed back in real time, the problem working procedure can be rapidly positioned, invalid construction is avoided, and the overall construction quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bored cast-in-place pile foundation quality control and relates to a bored cast-in-place pile foundation quality control system based on a pebble stratum. Background Art

[0002] Bored piles are a type of pile foundation widely used in construction projects, especially in areas with complex geological conditions and high bearing capacity requirements. Pebble formations, as a typical geological type, have the characteristics of large particles, uneven distribution, and strong permeability, which brings considerable challenges to the construction of bored piles. In such formations, the construction quality needs to be strictly controlled to ensure the stability and bearing capacity of the pile foundation. Therefore, the quality control method of bored pile foundation based on pebble formations is of great significance and role.

[0003] There are also some related solutions for bored pile foundation in the prior art. For example, the Chinese patent publication number CN104727357B is a method for detecting and repairing pile foundation defects of bored piles, which includes: when the heating element is at a certain depth, only the waveform peak of one thermal optical fiber decreases, then the pile body at this depth is determined to be hollow, and the hollow is located on the radius of the pile body cross section passing through the abnormal thermal optical fiber; when the heating element is at a certain depth, if the waveform peaks of two adjacent thermal optical fibers decrease, the pile body at this depth is determined to be hollow, and the hollow is located on the fan-shaped surface sandwiched by the two radii passing through the two abnormal thermal optical fibers; when the heating element is at a certain depth, the waveform peaks of all thermal optical fibers decrease, then it is determined that there is a broken pile at this depth. This method does not miss any detection, and can accurately measure the longitudinal depth of each layer of broken piles, and also measures the longitudinal depth of each hollow and the lateral position of the hollow on the cross section of the pile foundation, and can also effectively repair each defect.

[0004] Another Chinese patent publication number CN114108608B is a bored cast-in-place pile foundation quality control system, which includes: a first cylinder; and a built-in tamping component arranged in the first cylinder, characterized in that the bored cast-in-place pile foundation quality control system also includes a wall-mounted tamping component, and the wall-mounted tamping component includes: a first thermal response component, which is mounted on the outer wall of the first cylinder in a manner that it is at least partially surrounded by an isolation sleeve and isolated from the external environment; a second thermal response component, which is mounted on the outer wall of the first cylinder in a manner that it is at least partially surrounded by an isolation sleeve and can be connected to the external environment, wherein, when the wall-mounted tamping component enters the cast and is hot-started, the second thermal response component can form a negative pressure environment located in the isolation sleeve and form a gas adsorption effect on the cast under the negative pressure environment, which is enhanced by the excitation effect of the first thermal response component stimulated by the hot start.

[0005] Although the prior art has proposed some solutions for bored cast-in-place pile foundations, there are still certain limitations: (1) Some prior art mainly detects and analyzes the longitudinal depth of each layer of broken piles and the longitudinal depth of each cavity and the lateral position of the cavity on the cross section of the pile foundation, and effectively repairs them; some prior art mainly detects and analyzes the pouring process to perform quality control. However, the prior art does not perform quality inspection and analysis on the entire construction process of the bored cast-in-place pile foundation, and thus cannot guarantee the safety and stability of the entire construction process of the bored cast-in-place pile foundation.

[0006] (2) The existing technologies lack the ability to select appropriate construction parameters based on the characteristics of the current pebble strata, thereby failing to ensure that the construction parameters meet the design requirements of the current pebble strata and thus failing to ensure that each step of construction meets the design requirements and quality standards, thereby failing to improve the overall construction quality and avoid the occurrence of quality accidents. Summary of the invention

[0007] In view of this, in order to solve the problems raised in the above background technology, a bored cast-in-place pile foundation quality control system based on pebble strata is proposed.

[0008] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides a bored pile foundation quality control system based on pebble strata, including: a construction basic data acquisition module, a construction process detection module, a construction process analysis module, a construction quality feedback module, a construction control module and an information base.

[0009] The basic construction data acquisition module is used to record the pebble stratum to be constructed as the target pebble stratum, obtain the basic parameters of the target pebble stratum, and analyze the basic construction data of the bored piles in the target pebble stratum based on the basic parameters.

[0010] The construction process detection module is used to perform real-time detection on the entire process of bored pile construction in the target pebble stratum, and obtain data information on the entire process of bored pile construction in the target pebble stratum, wherein the entire construction process includes drilling, mud pouring, lowering of steel cage and concrete pouring.

[0011] The construction process analysis module is used to analyze the quality evaluation index of bored pile drilling, mud injection, steel cage lowering and concrete pouring in the target pebble stratum, and then obtain the quality evaluation index of the whole process of bored pile construction in the target pebble stratum and provide feedback.

[0012] The construction quality feedback module is used to judge the construction quality of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum based on the quality evaluation index of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum, and feedback the construction quality.

[0013] The construction control module is used to carry out corresponding construction control on the bored pile drilling, mud injection, steel cage lowering and concrete pouring in the target pebble stratum.

[0014] The information base is used to store the influence index of each pebble particle size distribution diagram corresponding to the foundation evaluation coefficient, and store the basic construction data corresponding to each foundation evaluation coefficient.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention obtains the basic parameters of the target pebble formation and analyzes the basic construction data of the bored cast-in-place piles in the target pebble formation based on the basic parameters, which helps to select appropriate basic construction data according to the characteristics of the current pebble formation, ensures that the quality of the pile foundation meets the design requirements, and guarantees the safety and stability of the project.

[0016] 2. The present invention obtains data information of the entire process of bored pile construction in the target pebble stratum, analyzes the quality assessment index of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum, and then obtains the quality assessment index of the entire process of bored pile construction in the target pebble stratum. According to the real-time detection data and quality assessment results, it is helpful to dynamically adjust and optimize the construction plan, ensuring that each step of construction meets the design requirements and quality standards, thereby improving the overall construction quality, avoiding the occurrence of quality accidents, and reducing rework and repair costs.

[0017] 3. The present invention judges the construction quality of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum, and performs corresponding construction control on the bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum, and provides real-time feedback on the construction quality, which is helpful to quickly locate the problem process and the crux, avoid ineffective construction, reduce time cost, and improve the turnover efficiency of resources such as machinery and manpower. For large-scale projects with multiple pile foundations, the overall benefit is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of system module connection of the present invention.

[0020] Figure 2 The present invention is a flowchart of the system implementation steps.

[0021] Figure 3 The present invention provides a flow chart for analyzing the construction quality of the entire bored pile construction process in the target pebble stratum. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 As shown, the present invention provides a bored cast-in-place pile foundation quality control system based on pebble strata, and the specific modules are distributed as follows: construction basic data acquisition module, construction process detection module, construction process analysis module, construction quality feedback module, construction control module and information library. Among them, the connection mode between the modules is: the construction basic data acquisition module is connected with the construction process detection module, the construction process detection module is connected with the construction process analysis module, the construction process analysis module is connected with the construction quality feedback module, the construction quality feedback module is connected with the construction control module, and the information library is connected with the construction basic data acquisition module and the construction process analysis module respectively.

[0024] The basic construction data acquisition module is used to record the pebble stratum to be constructed as the target pebble stratum, obtain the basic parameters of the target pebble stratum, and analyze the basic construction data of the bored piles in the target pebble stratum based on the basic parameters.

[0025] It needs to be further explained that the system implementation step flow chart is as follows Figure 2 shown.

[0026] As a preferred feasibility example, the basic parameters of the target pebble formation include thickness, pebble particle size distribution map and groundwater level.

[0027] It should be further explained that the specific method of obtaining the thickness of the target pebble formation, the pebble particle size distribution map and the groundwater level is: use a professional drilling rig to drill holes at predetermined survey points, record the depth from the surface to the non-pebble formation interface, and record it as the thickness of the target pebble formation.

[0028] Take pebble samples from the target pebble formation, sieve them in the laboratory, select a set of standard sieves with apertures arranged in descending order, pour a certain mass of pebble samples into the top sieve, and through mechanical vibration, make the pebbles remain in different sieve layers according to their particle sizes. Finally, weigh the mass of pebbles in each sieve layer, and draw a pebble particle size distribution histogram based on this, which is recorded as the pebble particle size distribution map of the target pebble formation.

[0029] By arranging observation wells at a certain interval (such as 50-100m) at the predetermined survey points and deploying automatic water level monitoring instruments, the groundwater level of the target pebble formation can be measured.

[0030] The basic construction data of bored piles in the target pebble stratum includes construction reference data information of drilling, mud pouring, lowering of steel cage and concrete pouring.

[0031] It should be further explained that the construction reference data information of the drilling hole includes a reference depth and a reference hole diameter.

[0032] The construction reference data information of the mud injection includes reference density, reference viscosity, reference sand content and reference replenishment speed of the mud.

[0033] The construction reference data information for lowering the steel cage includes a reference lowering depth of the steel cage and a reference cage top elevation.

[0034] The construction reference data information of concrete pouring includes reference slump, reference expansion, reference pouring speed and reference filling density of concrete.

[0035] As a preferred feasibility example, the specific analysis method of the construction basic data of the bored piles of the target pebble formation is: extract the pebble particle size distribution map of the target pebble formation, match it with the influence index of the basic evaluation coefficient corresponding to each pebble particle size distribution map stored in the information database, and obtain the influence index of the basic evaluation coefficient corresponding to the pebble particle size distribution map of the target pebble formation .

[0036] In a specific example, the influence index of the basic evaluation coefficient corresponding to each pebble particle size distribution diagram includes but is not limited to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.

[0037] If the pebble size distribution map of the target pebble formation is consistent with the pebble size distribution map with an influence index of 0.3 corresponding to the basic evaluation coefficient, then the influence index of the pebble size distribution map of the target pebble formation corresponding to the basic evaluation coefficient is recorded as 0.3, that is, the influence index of the pebble size distribution map of the target pebble formation corresponding to the basic evaluation coefficient is obtained.

[0038] The thickness of the target pebble stratum and the groundwater level are extracted and recorded as .

[0039] Analysis of the foundation evaluation coefficient of bored piles in the target gravel stratum ,in are the preset target pebble stratum thickness threshold and groundwater level preset, respectively. is a natural constant.

[0040] The foundation assessment coefficient of the bored piles in the target pebble formation is compared with the basic construction data corresponding to each foundation assessment coefficient stored in the information database to obtain the basic construction data corresponding to the foundation assessment coefficient of the bored piles in the target pebble formation, which is recorded as the basic construction data of the bored piles in the target pebble formation.

[0041] The present invention obtains basic parameters of the target pebble stratum and analyzes the basic construction data of the bored piles in the target pebble stratum based on the basic parameters, which helps to select appropriate basic construction data according to the characteristics of the current pebble stratum, ensures that the quality of the pile foundation meets the design requirements, and guarantees the safety and stability of the project.

[0042] The construction process detection module is used to perform real-time detection on the entire process of bored pile construction in the target pebble stratum, and obtain data information on the entire process of bored pile construction in the target pebble stratum, wherein the entire construction process includes drilling, mud pouring, lowering of steel cage and concrete pouring.

[0043] As a preferred feasibility example, the data information of the drilling hole includes depth, hole diameter and verticality.

[0044] It should be further explained that the specific method for obtaining the depth, hole diameter and verticality of the bored pile hole in the target pebble stratum is to directly measure the depth of the bored pile hole in the target pebble stratum using a depth sensor arranged on the drill bit.

[0045] The diameter of the bored pile hole in the target pebble formation is directly measured by using the deployed ultrasonic diameter gauge.

[0046] The electronic inclinometer is placed inside the drill pipe. As the drill pipe is drilled, the electronic inclinometer measures the inclination angle of the drill pipe in real time. According to the analytical formula, the verticality of the bored pile hole in the target pebble stratum is obtained. ,in is the set permissible drill pipe inclination angle, This is the minimum value that is set to prevent the denominator from being 0. Its unit is degree.

[0047] It should be noted that the drill pipe inclination angle refers to the angle between the drill pipe axis and the vertical direction.

[0048] The data information of the mud injection includes the density, viscosity, sand content and replenishment speed of the mud.

[0049] It needs to be further explained that the specific method for obtaining the density, viscosity, sand content and replenishment rate of the mud in the target pebble formation during the bored pile mud injection is: using a densitometer and a viscometer to directly measure the density and viscosity of the mud in the target pebble formation during the bored pile mud injection.

[0050] Put the prepared target pebble formation mud sample for bored pile mud injection into a measuring cup and let it stand for a while to allow the sand particles in the mud to settle to the bottom of the cup. Then read the percentage of the volume of sand particles in the total volume of the mud, which is the sand content, and record it as the sand content of the mud for the target pebble formation in bored pile mud injection.

[0051] A flow meter is installed on the mud supply pipeline to measure the mud supply flow in real time, so as to obtain the mud supply speed of the target pebble formation during the bored pile mud injection.

[0052] The data information of lowering the steel cage includes the accuracy of the lowering position, the verticality and the cage top elevation of the steel cage.

[0053] It needs to be further explained that the specific method for obtaining the lowering position accuracy, verticality and cage top elevation of the steel cage of the bored pile cast-in-place pile in the target pebble stratum is as follows: a depth sensor is arranged on the top of the steel cage, and the distance between the steel cage and the hole is measured in real time, and the distance is added to the height of the steel cage to obtain the lowering depth of the steel cage of the bored pile cast-in-place pile in the target pebble stratum. , a laser centering instrument is placed above the pile hole. After the equipment is turned on, the instrument emits a vertically downward laser beam, and then obtains the deviation distance between the landing point of the laser beam on the reflective disc of the steel cage and the center of the disc. , analyze the accuracy of the lowering position of the steel cage of the bored pile in the target pebble stratum ,in The reference lowering depth of the steel cage for bored pile steel cage in the target pebble stratum is: is the allowable difference between the set lower depth and the reference lowering depth. is the allowable deviation distance between the falling point of the laser beam on the steel cage reflective disc and the center of the disc, This is the minimum value set to prevent the denominator from being 0, and its unit is meter.

[0054] It should be noted that the specific method for obtaining the deviation distance between the landing point of the laser beam on the reflective disk of the steel cage and the center of the disk is: a laser centering instrument is arranged above the pile hole. After the equipment is turned on, the instrument emits a vertically downward laser beam to accurately locate the center point of the pile hole. At the same time, a disk with a reflective mark is set on the top of the steel cage, and the center of the disk corresponds to the center point of the steel cage. As the steel cage is lowered, the landing point of the laser beam on the reflective disk is observed, and then the distance between the landing point and the center of the disk is measured using a laser rangefinder, which is recorded as the deviation distance between the landing point of the laser beam on the reflective disk of the steel cage and the center of the disk.

[0055] The laser plumb line instrument which is convenient to deploy directly measures the verticality of the steel cage placed under the bored pile steel cage in the target pebble stratum.

[0056] A level point must be established in advance at the construction site as a benchmark for elevation measurement and recorded as After the steel cage is lowered into place, a tower ruler is firmly set up around the hole, and a level is set up in a suitable position. The level reading is read and recorded as the initial level reading. , then place the tower ruler on the top of the steel cage, read the level reading, and record it as the level reading again , according to the calculation formula Get the cage top elevation of the steel cage placed under the bored pile steel cage in the target pebble stratum .

[0057] The concrete pouring data information includes the slump, expansion, pouring speed and filling density of the concrete.

[0058] It needs to be further explained that the specific method for obtaining the slump, expansion, pouring speed and filling density of the concrete cast in the bored pile concrete of the target pebble stratum is as follows: prepare a slump cone, fill the slump cone with the concrete cast in the bored pile concrete of the target pebble stratum, and the cone is about 10 cm higher than the top of the cone, and use a tamping rod to evenly tamp 25 times in the slump cone filled with the concrete cast in the bored pile concrete of the target pebble stratum, with a tamping depth of about 2.5 cm each time. After tamping, the surface of the concrete sample in the slump cone is flat, and then immediately measure the vertical distance from the top of the slump cone to its concrete plane, and record it as the slump of the concrete cast in the bored pile concrete of the target pebble stratum.

[0059] Prepare an expansion plate, a scraper and a ruler, put the concrete cast in the target pebble stratum in the bored pile concrete into the expansion plate, use the scraper to flatten the surface, and form circular specimens of the concrete cast in the target pebble stratum in the bored pile concrete with a diameter the same as the expansion plate and a thickness of 2 cm, and immediately measure the diameter of the circular specimens of the concrete cast in the target pebble stratum in the bored pile concrete with a ruler after forming, and use it as the initial diameter of the circular specimens of the concrete cast in the target pebble stratum in the bored pile concrete, recorded as After 1 hour of placement, the diameter of the circular specimen of the target pebble stratum cast in bored pile concrete is measured again and recorded as , the expansion of the concrete in the target pebble stratum during bored pile concrete pouring is calculated .

[0060] During the concrete pouring process, a flow meter installed on the concrete delivery pump pipe is used to record the volume of concrete passing through a set time period, which is then divided by the set time period. The resulting ratio is recorded as the concrete pouring speed of the bored pile concrete pouring in the target pebble stratum.

[0061] Before pouring concrete, an ultrasonic transducer is installed on the steel cage. During the concrete pouring process, the ultrasonic detector transmits and receives ultrasonic signals to the transducer, and then the propagation speed and amplitude of the ultrasonic wave in the concrete are obtained, which are recorded as , according to the analytical formula Obtain the filling density of the target pebble stratum in the concrete poured by bored pile concrete ,in are the propagation velocity threshold and amplitude threshold of ultrasonic waves in concrete respectively.

[0062] The construction process analysis module is used to analyze the quality evaluation index of bored pile drilling, mud injection, steel cage lowering and concrete pouring in the target pebble stratum, and then obtain the quality evaluation index of the whole process of bored pile construction in the target pebble stratum and provide feedback.

[0063] As a preferred feasibility example, the specific analysis method of the quality evaluation index of the bored pile drilling in the target pebble stratum is: extract the depth, hole diameter and verticality of the bored pile drilling in the target pebble stratum, and record them as , analyze the quality evaluation index of bored pile drilling in the target pebble stratum ,in are the reference depth and reference hole diameter of bored piles in the target pebble formation, The verticality threshold of bored pile drilling in the preset target pebble formation is They are the allowable difference between the set depth and the reference depth, and the allowable difference between the aperture and the reference aperture.

[0064] It needs to be further explained that the depth reflects whether the pile body has reached the designed elevation, the hole size is related to the smoothness of the subsequent lowering of the steel cage and concrete pouring, and the verticality directly affects the stress state of the pile body. Once the verticality deviation is too large, the lateral force borne by the pile body will be unevenly distributed, which will seriously threaten the stability of the entire pile foundation structure.

[0065] The quality assessment index of the target pebble formation in bored pile drilling comprehensively considers the degree of deviation of each key dimension of the drilling from the ideal state. The smaller the value, the closer the drilling quality is to the preset standard. Otherwise, it means that there is a certain quality risk, and subsequent construction links may require targeted adjustments or rectifications.

[0066] As a preferred feasibility example, the specific analysis method of the quality evaluation index of the bored pile grouting in the target pebble stratum is as follows: the density, viscosity, sand content and replenishment rate of the slurry of the bored pile grouting in the target pebble stratum are extracted and recorded as , analyze the quality evaluation index of bored pile grouting in the target pebble stratum ,in are the reference density, reference viscosity, reference sand content and reference replenishment rate of the mud for bored pile grouting in the target pebble stratum, They are respectively the allowable difference between the set density and the reference density, the allowable difference between the viscosity and the reference viscosity, the allowable difference between the sand content and the reference sand content, and the allowable difference between the replenishment rate and the reference replenishment rate.

[0067] It should be further explained that the mud density affects the pressure of the mud on the hole wall. The appropriate density can maintain the stability of the hole wall and prevent hole collapse. The viscosity is related to the fluidity and slag carrying capacity of the mud. Only when the viscosity is moderate can the drilling slag be smoothly removed without clogging the pipeline. The lower the sand content, the better. Too high sand content will wear the drill tool and affect the mud performance. The replenishment speed must match the drilling progress and mud loss to ensure that there is always enough mud in the hole.

[0068] The quality evaluation index of the target pebble formation in bored pile mud injection is analyzed and calculated by comparing the actual extracted mud index values, the corresponding reference index and the allowable difference, and substituting them into a specific formula to finally obtain the quality evaluation index of the target pebble formation in bored pile mud injection. This index can intuitively reflect the degree of fit between the actual mud injection situation and the ideal standard. Once the index deviates from the reasonable range, it means that there may be problems in the mud injection process, and the relevant parameters need to be adjusted in time.

[0069] As a preferred feasibility example, the specific analysis method of the quality evaluation index of the bored pile steel cage placed in the target pebble stratum is: extract the placement position accuracy, verticality and cage top elevation of the bored pile steel cage placed in the target pebble stratum, and record them as , analyze the quality evaluation index of the target pebble stratum in the placement of bored pile reinforcement cage ,in The reference cage top elevation of the steel cage lowered for bored pile steel cage in the target pebble stratum. It is the allowable difference between the set cage top elevation and the reference cage top elevation.

[0070] It needs to be further explained that the accuracy of the lowering position is extremely critical. It determines whether the steel cage is accurately located at the predetermined position of the pile hole, and whether the steel cage can be evenly stressed during the subsequent concrete pouring, providing a stable steel skeleton support for the pile body. The verticality affects the overall stress state of the steel cage. Poor verticality will cause some steel bars to bear additional stress, weakening the overall strength of the pile body. The cage top elevation is related to the subsequent connection with the upper structure such as the pedestal. Inaccurate elevation will hinder the subsequent construction connection.

[0071] The quality assessment index of the lowering of the bored pile steel cage in the target pebble stratum is calculated by comparing the actual measured parameters of the lowering position accuracy, verticality and cage top elevation with the corresponding reference standard and the allowable difference, and substituting them into the corresponding calculation formula. This index reflects the degree of fit between the lowering operation of the steel cage and the ideal construction standard. If the value exceeds the reasonable range, it indicates that there are quality risks in this link, which should be promptly checked and corrected.

[0072] As a preferred feasibility example, the specific analysis method of the quality evaluation index of bored pile concrete pouring in the target pebble stratum is: extract the slump, expansion, pouring speed and filling density of the bored pile concrete pouring in the target pebble stratum, and record them as , analyze the quality evaluation index of bored pile concrete pouring in the target pebble stratum ,in are the reference slump, reference expansion, reference pouring speed and reference filling density of the bored pile concrete pouring in the target pebble stratum, They are the allowable difference between the set slump and the reference slump, the allowable difference between the expansion and the reference expansion, the allowable difference between the pouring speed and the reference pouring speed, and the allowable difference between the filling density and the reference filling density.

[0073] It needs to be further explained that the slump reflects the fluidity of concrete. The appropriate slump can ensure that the concrete falls smoothly in the conduit and evenly fills the pile hole. The expansion further supplements the rheological properties of concrete, and together with the slump, determines the spreading of concrete in the pile hole. The pouring speed controls the construction rhythm. It should not be too fast to cause concrete segregation, nor too slow to cause poor bonding between the upper and lower layers of concrete. The filling density is directly related to the quality of the pile body concrete. Insufficient density will leave defects such as holes and honeycombs, which will seriously weaken the strength of the pile body.

[0074] The quality evaluation index of bored pile concrete pouring in the target pebble stratum can be obtained by comparing the actual slump, expansion, pouring speed and filling density with the corresponding reference parameters and allowable difference, and substituting them into a specific calculation formula to obtain the quality evaluation index of this link. This index can clearly show the degree of fit between the actual concrete pouring situation and the ideal construction standard. Once the index deviates from the reasonable range, it means that there is a problem in the pouring process, and it is necessary to adjust the construction operation or concrete mix ratio and other factors in time.

[0075] As a preferred feasibility example, the specific analysis method of the quality evaluation index of the target pebble stratum during the whole process of bored pile construction is as follows: Obtain the quality evaluation index of the whole process of bored pile construction in the target pebble stratum ,in The quality assessment indexes of drilling, mud injection, steel cage lowering and concrete pouring are respectively set as weight factors corresponding to the quality assessment indicators of the whole construction process.

[0076] A specific example, .

[0077] Drilling is a basic link in construction, and its quality directly affects the subsequent process and the stability of the overall structure. Due to the importance of drilling quality, its weight factor is usually placed at a higher position. Therefore, the weight factor of the drilling quality evaluation index corresponding to the quality evaluation index of the entire construction process is assigned to 0.4.

[0078] The quality of the steel cage lowering directly affects the bearing capacity and stability of the concrete structure as the skeleton of the concrete structure. The quality of the steel cage lowering is crucial to the safety of the overall structure, and its weight factor is relatively high. Therefore, the weight factor of the quality assessment index of the steel cage lowering corresponding to the quality assessment index of the entire construction process is assigned to 0.3.

[0079] Mud injection plays a key role in bored pile construction, which is related to the bearing capacity and stability of the pile. The quality of mud injection has an important impact on the quality of the pile body and the stability of the overall structure, but its weight factor may be slightly lower than that of drilling and steel cage lowering. Therefore, the weight factor of the quality evaluation index of mud injection corresponding to the quality evaluation index of the whole construction process is assigned to 0.2.

[0080] Concrete pouring is the last key link in the construction process, and its quality directly affects the strength and durability of the overall structure. Although the quality of concrete pouring is equally important, it is carried out after the processes of drilling, lowering the steel cage and grouting, and its quality is affected to a certain extent by the previous processes, so its weight factor ranks last. Therefore, the quality assessment index of concrete pouring is assigned a weight factor of 0.1 corresponding to the quality assessment index of the entire construction process.

[0081] The present invention obtains data information of the entire bored pile construction process of the target pebble stratum, analyzes the quality assessment index of the bored pile drilling, mud injection, steel cage lowering and concrete pouring of the target pebble stratum, and then obtains the quality assessment index of the entire bored pile construction process of the target pebble stratum. According to the real-time detection data and quality assessment results, it is helpful to dynamically adjust and optimize the construction plan, ensuring that each step of construction meets the design requirements and quality standards, thereby improving the overall construction quality, avoiding the occurrence of quality accidents, and reducing rework and repair costs.

[0082] The construction quality feedback module is used to judge the construction quality of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum based on the quality evaluation index of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum, and feedback the construction quality.

[0083] As a preferred feasibility example, the specific analysis method of the construction quality of the target pebble stratum in bored pile drilling, mud pouring, steel cage lowering and concrete pouring is: extracting the quality evaluation index of the target pebble stratum in bored pile drilling, mud pouring, steel cage lowering and concrete pouring.

[0084] The quality assessment index of the target pebble stratum in the bored cast-in-place pile drilling is compared with the preset quality assessment index threshold of the drilling. If the quality assessment index of the target pebble stratum in the bored cast-in-place pile drilling is greater than the quality assessment index threshold of the drilling, the construction quality of the target pebble stratum in the bored cast-in-place pile drilling is recorded as qualified; otherwise, the construction quality of the target pebble stratum in the bored cast-in-place pile drilling is recorded as unqualified.

[0085] Similarly, the construction quality of the target pebble stratum during the grouting of bored piles, lowering of steel cages and pouring of concrete can be obtained.

[0086] It is necessary to further explain that the analysis flow chart of the construction quality of the target pebble stratum during the entire process of bored pile construction is as follows: Figure 3 shown.

[0087] The construction control module is used to carry out corresponding construction control on the bored pile drilling, mud injection, steel cage lowering and concrete pouring in the target pebble stratum.

[0088] As a preferred feasibility example, the specific operations of performing corresponding construction control on the drilling of bored piles, mud pouring, lowering of steel cage and pouring of concrete in the target pebble stratum include: further determining the reasons for the unqualified construction quality of the drilling of bored piles, mud pouring, lowering of steel cage and pouring of concrete in the target pebble stratum according to the construction quality of the drilling of bored piles, mud pouring, lowering of steel cage and pouring of concrete in the target pebble stratum, and then performing corresponding construction control accordingly.

[0089] It needs to be further explained that the method for determining the reason for the unqualified construction quality of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble formation is as follows: extract the depth, hole diameter and verticality of the bored pile drilling of the target pebble formation, and compare them with the reference depth, reference hole diameter and reference verticality of the corresponding borehole, respectively, and screen out the parameters of the depth, hole diameter and verticality of the bored pile drilling of the target pebble formation that are inconsistent with the reference depth, reference hole diameter and reference verticality of the corresponding borehole, and record them as the reason for the unqualified construction quality of the bored pile drilling of the target pebble formation.

[0090] The density, viscosity, sand content and replenishment rate of the mud injection of bored piles in the target pebble stratum are further extracted. Similarly, the reasons for the unqualified construction quality of the mud injection of bored piles in the target pebble stratum can be obtained.

[0091] The lowering position accuracy, verticality and cage top elevation of the steel cage under the bored pile steel cage in the target pebble stratum are further extracted. Similarly, the reasons for the unqualified construction quality of the bored pile steel cage under the target pebble stratum can be obtained.

[0092] The slump, expansion, pouring speed and filling density of the concrete poured in the bored pile concrete in the target pebble stratum are further extracted. Similarly, the reasons for the unqualified construction quality of the bored pile concrete poured in the target pebble stratum can be obtained.

[0093] The information database is used to store the influence index of each pebble particle size distribution diagram corresponding to the foundation evaluation coefficient, and store the basic construction data corresponding to each foundation evaluation coefficient.

[0094] The present invention judges the construction quality of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum, performs corresponding construction control on the bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum, and provides real-time feedback on the construction quality, which is helpful to quickly locate the problem process and the crux, avoid ineffective construction, reduce time cost, and improve the turnover efficiency of resources such as machinery and manpower. For large-scale projects with multiple pile foundations, the overall benefit is significantly improved.

[0095] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A bored pile foundation quality control system based on pebble strata, characterized by: include: A basic construction data acquisition module is used to record the pebble stratum to be constructed as the target pebble stratum, obtain basic parameters of the target pebble stratum, and analyze the basic construction data of the bored piles in the target pebble stratum based on the basic parameters; The construction process detection module is used to perform real-time detection on the entire process of bored pile construction in the target pebble formation, and obtain data information on the entire process of bored pile construction in the target pebble formation, wherein the entire construction process includes drilling, slurry pouring, lowering of steel cage and concrete pouring; The construction process analysis module is used to analyze the quality evaluation index of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum, and then obtain the quality evaluation index of the whole process of bored pile construction in the target pebble stratum and provide feedback; A construction quality feedback module is used to judge the construction quality of bored pile drilling, slurry pouring, steel cage lowering and concrete pouring in the target pebble stratum based on the quality evaluation index of bored pile drilling, slurry pouring, steel cage lowering and concrete pouring in the target pebble stratum, and feedback the same; The construction control module is used to control the construction of bored pile drilling, slurry injection, steel cage lowering and concrete pouring in the target pebble stratum; The information base is used to store the influence index of each pebble particle size distribution diagram corresponding to the foundation evaluation coefficient, and store the basic construction data corresponding to each foundation evaluation coefficient.

2. A bored pile foundation quality control system based on pebble strata according to claim 1, characterized in that: The basic parameters of the target pebble formation include thickness, pebble particle size distribution map and groundwater level; The basic construction data of bored piles in the target pebble stratum includes construction reference data information of drilling, slurry pouring, steel cage lowering and concrete pouring; The data information of the drilling hole includes depth, hole diameter and verticality; The data information of the mud injection includes the density, viscosity, sand content and replenishment speed of the mud; The data information of the lowering of the steel cage includes the lowering position accuracy, verticality and cage top elevation of the steel cage; The concrete pouring data information includes the slump, expansion, pouring speed and filling density of the concrete.

3. A bored pile foundation quality control system based on pebble strata according to claim 2, characterized in that: The specific analysis method of the basic construction data of bored piles in the target pebble stratum is as follows: Extract the pebble size distribution map of the target pebble formation, match it with the influence index of the basic evaluation coefficient corresponding to each pebble size distribution map stored in the information database, and obtain the influence index of the basic evaluation coefficient corresponding to the pebble size distribution map of the target pebble formation ; The thickness of the target pebble stratum and the groundwater level are extracted and recorded as ; Analysis of the foundation evaluation coefficient of bored piles in the target gravel stratum ,in are the preset target pebble stratum thickness threshold and groundwater level preset, respectively. is a natural constant; The foundation assessment coefficient of the bored piles in the target pebble formation is compared with the basic construction data corresponding to each foundation assessment coefficient stored in the information database to obtain the basic construction data corresponding to the foundation assessment coefficient of the bored piles in the target pebble formation, which is recorded as the basic construction data of the bored piles in the target pebble formation.

4. A bored pile foundation quality control system based on pebble strata according to claim 2, characterized in that: The specific analysis method of the quality evaluation index of the target pebble stratum in bored pile drilling is: The depth, diameter and verticality of the bored pile hole in the target pebble stratum are extracted and recorded as , analyze the quality evaluation index of bored pile drilling in the target pebble stratum ,in are the reference depth and reference hole diameter of bored piles in the target pebble formation, The verticality threshold of bored pile drilling in the preset target pebble formation is They are the allowable difference between the set depth and the reference depth, and the allowable difference between the aperture and the reference aperture.

5. A bored pile foundation quality control system based on pebble strata according to claim 3, characterized in that: The specific analysis method of the quality evaluation index of the target pebble stratum in bored pile grouting is: The density, viscosity, sand content and replenishment rate of the slurry for bored pile slurry injection in the target pebble stratum are extracted and recorded as , analyze the quality evaluation index of bored pile grouting in the target pebble stratum ,in are the reference density, reference viscosity, reference sand content and reference replenishment rate of the mud for bored pile grouting in the target pebble stratum, They are respectively the allowable difference between the set density and the reference density, the allowable difference between the viscosity and the reference viscosity, the allowable difference between the sand content and the reference sand content, and the allowable difference between the replenishment rate and the reference replenishment rate.

6. A bored pile foundation quality control system based on pebble strata according to claim 5, characterized in that: The specific analysis method of the quality evaluation index of the target pebble stratum under the bored pile reinforcement cage is: The lowering position accuracy, verticality and cage top elevation of the bored pile reinforcement cage in the target pebble stratum are extracted and recorded as , analyze the quality evaluation index of the target pebble stratum in the placement of bored pile reinforcement cage ,in The reference cage top elevation of the steel cage lowered for bored pile steel cage in the target pebble stratum. It is the allowable difference between the set cage top elevation and the reference cage top elevation.

7. A bored pile foundation quality control system based on pebble strata according to claim 6, characterized in that: The specific analysis method of the quality evaluation index of the target pebble stratum in bored pile concrete pouring is: The slump, expansion, pouring speed and filling density of the bored pile concrete pouring in the target pebble stratum are extracted and recorded as , analyze the quality evaluation index of bored pile concrete pouring in the target pebble stratum ,in are the reference slump, reference expansion, reference pouring speed and reference filling density of the bored pile concrete pouring in the target pebble stratum, They are respectively the allowable difference between the set slump and the reference slump, the allowable difference between the expansion and the reference expansion, the allowable difference between the pouring speed and the reference pouring speed, and the allowable difference between the filling density and the reference filling density.

8. The bored pile foundation quality control system based on pebble strata according to claim 7 is characterized by: The specific analysis method of the quality evaluation index of the target pebble stratum during the whole process of bored pile construction is as follows: According to the analysis model Obtain the quality evaluation index of the whole process of bored pile construction in the target pebble stratum ,in The quality assessment indexes of drilling, mud injection, steel cage lowering and concrete pouring are respectively set as weight factors corresponding to the quality assessment indicators of the whole construction process.

9. A bored pile foundation quality control system based on pebble strata according to claim 7, characterized in that: The specific analysis method for the construction quality of bored pile drilling, mud pouring, steel cage lowering and concrete pouring in the target pebble stratum is as follows: Extract the quality assessment index of bored pile drilling, slurry injection, steel cage lowering and concrete pouring in the target pebble stratum; The quality assessment index of the target pebble stratum in the bored pile drilling is compared with the preset quality assessment index threshold of the drilling. If the quality assessment index of the target pebble stratum in the bored pile drilling is greater than the quality assessment index threshold of the drilling, the construction quality of the target pebble stratum in the bored pile drilling is recorded as qualified; otherwise, the construction quality of the target pebble stratum in the bored pile drilling is recorded as unqualified; Similarly, the construction quality of the target pebble stratum during the grouting of bored piles, lowering of steel cages and pouring of concrete can be obtained.

10. A bored pile foundation quality control system based on pebble strata according to claim 9, characterized in that: Based on the construction quality of bored pile drilling, mud injection, steel cage lowering and concrete pouring in the target pebble stratum, the reasons for the failure are further determined, and corresponding construction control is carried out accordingly.

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