A construction method of interlocking piles for building retaining walls

Abstract

The present invention relates to the technical field of interlocking pile construction, and in particular to an interlocking pile construction method for constructing a retaining wall, comprising: placing a casing on a pipe rolling machine and drilling the casing to a set depth to obtain a pile hole A; placing a guide tube in the pile hole A and pouring super-retarded concrete; when it is determined according to a structural stability characterization value of the pile A that the preparation of the pile A does not meet a preset standard, increasing the amount of retarder added to the super-retarded concrete or reducing the extraction rate of the casing of the next batch; using a casing drill to cut concrete on both sides of adjacent piles A to form a pile hole B; lowering a steel cage and pouring ordinary concrete to form pile B, and obtaining an interface bonding characterization value; when it is determined according to the interface bonding characterization value that the construction of pile B does not meet the standard, secondarily determining whether the construction of pile B meets the preset standard according to an amplitude attenuation coefficient, or determining the reason why the construction of pile B does not meet the preset standard according to a horizontal displacement value of the pile top, thereby improving construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of interlocking pile construction, in particular to an interlocking pile construction method for constructing a retaining wall. Background Art

[0002] Bored interlocking piles are a type of foundation pit retaining structure that uses mechanical drilling to create an interlocking arrangement between piles.

[0003] Snap-in piles are suitable for retaining structures of deep foundation pits in soft strata and water-bearing sand layers, especially those in saturated water-rich strata. They are particularly suitable for hard rock and gravel layers that are difficult to drill with conventional rotary drilling rigs, as well as for soft silt formations and loose sand layers where drilling mud is difficult to protect the walls.

[0004] To facilitate cutting and maintain structural stability, the piles are arranged alternately with a concrete pile (Pile A) and a concrete pile (Pile B). Typically, interlocking pile construction begins with Pile A, followed by Pile B. The A piles utilize ultra-slow-setting concrete. During construction, the casing drill must utilize the cutting power of the casing drill to remove the intersecting concrete between adjacent A piles, ensuring interlocking of the A and B piles. Bored interlocking piles are constructed using a percussion drill, creating a retaining structure with interlocking piles.

[0005] Initial setting time is the point at which concrete begins to lose its plasticity and gradually develop strength. According to ASTM C403, initial setting time is the time it takes for concrete to reach a penetration resistance of 3.5 MPa.

[0006] Super-slow-setting concrete refers to a special concrete that uses composite retarder technology to extend the initial setting time to more than 48-72 hours, and the strength loss in 28 days does not exceed 15%. Its essence is to reshape the time-varying properties of concrete by inhibiting the early hydration reaction of cement.

[0007] Chinese patent application publication number: CN113322943A, discloses a snap pile and a construction method for snap piles. A snap pile construction method includes the following steps: S1, constructing a plurality of A concrete pile holes; S2, installing a first steel cage in each A concrete pile hole, and installing an isolation box on the side of the first steel cage according to the design size of the concrete cover, and each isolation box is located on the inner wall of the corresponding A concrete pile hole; S3, casting the A concrete piles and removing the isolation box; S4, constructing B concrete pile holes in the reserved position of each isolation box and the area between two adjacent isolation boxes, and each B concrete pile hole is located between two adjacent A concrete piles; S5, installing a second steel cage in each B concrete pile hole and casting the B concrete piles.

[0008] It can be seen that the above technical solution only ensures engagement through physical isolation, lacks a detection and repair mechanism for internal defects of the pile body, and cannot quantitatively determine the quality of pile B and associate adjustment measures through the interface binding characterization value amplitude attenuation coefficient; it relies on experience-based construction and does not consider the impact of the initial setting time of concrete and the casing extraction rate on the construction process, resulting in the concrete of pile A being disturbed by the construction of pile B before it solidifies, or the concrete of pile A being excessively solidified, increasing the difficulty of cutting, thereby leading to low construction efficiency. Summary of the Invention

[0009] To this end, the present invention provides a method for constructing interlocking piles for constructing retaining walls, which is used to overcome the problems in the prior art where interlocking is ensured only by physical isolation, there is a lack of a detection and repair mechanism for internal defects of the pile body, and the quality of pile B cannot be quantitatively determined by the amplitude attenuation coefficient of the interface binding characterization value and associated adjustment measures; the construction relies on experience, and the influence of the initial setting time of concrete and the casing extraction rate on the construction process is not considered, resulting in the concrete of pile A being disturbed by the construction of pile B before it solidifies, or the concrete of pile A being excessively solidified, which increases the difficulty of cutting, thereby leading to low construction efficiency.

[0010] To achieve the above object, the present invention provides a method for constructing interlocking piles for constructing retaining walls, comprising:

[0011] Place the casing on the pipe rolling machine and drill it down to the set depth to obtain pile hole A;

[0012] placing a conduit into the hole of pile A and pouring super-slow setting concrete, obtaining the initial setting time of the super-slow setting concrete and the maximum verticality deviation during the casing withdrawal process, and calculating the structural stability characterization value of pile A;

[0013] When it is determined based on the structural stability characterization value of pile A that the preparation of pile A does not meet the preset standard, the amount of retarder added to the super-slow setting concrete is increased or the extraction rate of the casing of the next batch is reduced;

[0014] When it is determined that the preparation of the A pile meets the preset standard, a plurality of A piles are obtained;

[0015] Using a casing drill to cut the concrete on both sides of the adjacent pile A to form a pile hole B;

[0016] Lower the steel cage and pour ordinary concrete to form pile B, obtain the sound velocity of the ultrasonic wave at several sound velocity measurement points of pile B, and calculate the interface bonding characterization value;

[0017] When it is determined that the construction of pile B does not meet the preset standard based on the interface bonding characterization value, a secondary determination is made as to whether the construction of pile B meets the preset standard based on the amplitude attenuation coefficient, or the reason why the construction of pile B does not meet the preset standard is determined based on the pile top horizontal displacement value;

[0018] When it is determined that the construction of pile B meets the preset standard, the construction of the target occlusal pile is completed.

[0019] Furthermore, the process of determining whether the preparation of pile A meets the preset standard according to the structural stability characterization value of pile A includes:

[0020] Comparing the structural stability characterization value with the first preset structural stability characterization value and the second preset structural stability characterization value respectively;

[0021] If the structural stability characterization value is less than the first preset structural stability characterization value, it is determined that the preparation of pile A meets the preset standard;

[0022] If the structural stability characterization value is greater than or equal to the first preset structural stability characterization value and less than the second preset structural stability characterization value, it is determined that the preparation of pile A does not meet the preset standard, and the amount of retarder added to the ultra-slow setting concrete is increased according to the difference between the first preset structural stability characterization value and the structural stability characterization value;

[0023] If the structural stability characterization value is greater than or equal to the second preset structural stability characterization value, it is determined that the preparation of pile A does not meet the preset standard, and the extraction rate of the next casing is reduced according to the difference between the structural stability characterization value and the second preset structural stability characterization value.

[0024] Furthermore, there are several ways to increase the amount of the retarder added to the super-slow setting concrete, and each way increases the amount of the retarder added by a different amount.

[0025] Furthermore, the structural stability characterization value is determined by the initial setting time of the ultra-slow setting concrete and the maximum verticality deviation during the casing extraction process.

[0026] Furthermore, the process of determining whether the preparation of the B pile meets the preset standard based on the interface bonding characterization value of the B pile includes:

[0027] comparing the interface binding characterization value with a first preset interface binding threshold and a second preset interface binding threshold, respectively;

[0028] If the interface binding characteristic value is less than the first preset interface binding threshold, it is determined that the preparation of the B pile meets the preset standard;

[0029] If the interface bonding characteristic value is greater than or equal to the first preset interface bonding threshold and less than the second preset interface bonding threshold, it is determined that the preparation of the B pile does not meet the preset standard, and a second determination is made based on the amplitude attenuation coefficient of the B pile whether the preparation of the B pile meets the preset standard;

[0030] If the interface bonding characterization value is greater than or equal to the second preset interface bonding threshold, it is determined that the preparation of the B pile does not meet the preset standard, and the reason why the preparation of the B pile does not meet the preset standard is determined based on the pile top horizontal displacement value of the B pile.

[0031] Furthermore, the interface bonding characterization value of the B pile is determined by the number of sound velocity measurement points where the sound velocity is less than a preset sound velocity.

[0032] Furthermore, if the amplitude attenuation coefficient of pile B is less than a preset amplitude attenuation coefficient, it is determined that the preparation of pile B does not meet the preset standard, and the reason for not meeting the preset standard is that the concrete flows too quickly, resulting in pores formed inside pile B. The pouring rate of the ordinary concrete is reduced according to the difference between the preset amplitude attenuation coefficient and the amplitude attenuation coefficient.

[0033] The amplitude attenuation coefficient is the ratio between the ultrasonic wave receiving amplitude and the incident wave amplitude of the B pile.

[0034] Furthermore, the reduction range of the pouring rate of the ordinary concrete is positively correlated with the amplitude attenuation difference, and the amplitude attenuation difference is the difference between the preset amplitude attenuation coefficient and the amplitude attenuation coefficient.

[0035] Furthermore, the reasons why the preparation of pile B does not meet the preset standards are determined based on the horizontal displacement value of the pile top of pile B, including:

[0036] If the horizontal displacement value of the pile top is less than the preset horizontal displacement value, it is determined that the preparation of pile B does not meet the preset standard because pile B has local mud inclusions.

[0037] If the pile top horizontal displacement value is greater than or equal to the preset horizontal displacement value, it is determined that the preparation of pile B does not meet the preset standard because the initial setting time of pile A is too long, and the amount of retarder added to the ultra-slow setting concrete is corrected according to the difference between the pile top horizontal displacement value and the preset horizontal displacement value;

[0038] The horizontal displacement value of the pile top of pile B is obtained by a total station.

[0039] Furthermore, several addition amount correction methods are provided for correcting the addition amount of the retarder of the ultra-slow setting type concrete, and each addition amount correction method has a different correction range for the addition amount of the retarder of the ultra-slow setting type concrete.

[0040] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention dynamically monitors the initial setting time of the super-slow concrete of pile A and the verticality deviation of the casing, and adjusts the amount of retarder added or the withdrawal rate of the casing in real time to ensure the solidification state of pile A and the hole forming accuracy; combines the ultrasonic sound velocity to obtain the interface bonding characterization value, and determines the bite quality of pile B according to the interface bonding characterization value and the amplitude attenuation coefficient, and accurately identifies the mud in pile B or the excessive initial setting time of pile A according to the horizontal displacement value of the pile top, and adjusts the ordinary concrete pouring rate or corrects the amount of retarder added in a related manner to avoid construction disturbance of pile B, thereby improving the construction efficiency of the bite pile.

[0041] Furthermore, the present invention dynamically monitors the initial setting time and verticality deviation of pile A to obtain the structural stability characterization value of pile A, determines the preparation effect of pile A through a two-level threshold value, adjusts the construction parameters in stages, increases the amount of retarder added, and extends the subsequent initial setting time of pile A to ensure that pile B has sufficient time to be cut; reduces the casing extraction rate and reduces the verticality deviation of the pile hole, thereby improving the construction efficiency of pile A.

[0042] Furthermore, the present invention provides several methods for increasing the amount of retarder added to the super-slow concrete, and each method increases the amount of retarder added by a different amount, thereby achieving precise control of the increase in the amount of retarder added.

[0043] Furthermore, the present invention obtains the structural stability characterization value of pile A through the initial setting time and the maximum verticality deviation, quantifies the structural stability of pile A, and combines material properties and construction accuracy, thereby improving the evaluation accuracy.

[0044] Furthermore, the present invention performs graded judgment on the construction effect of pile B by setting a first preset interface combination threshold and a second preset interface combination threshold. When the value is between the first and second thresholds, a secondary verification is performed in combination with the amplitude attenuation coefficient to avoid unnecessary rework due to misjudgment of a single indicator. When the interface combination characterization value exceeds the second threshold, it is directly judged as substandard, and the root cause of the defect is traced through the horizontal displacement value of the pile top of pile B, and a targeted repair plan is formulated, thereby improving the reliability of detection.

[0045] Furthermore, the present invention sets an amplitude attenuation coefficient to directly reflect the energy loss of ultrasound in concrete. The lower the amplitude attenuation coefficient, the higher the internal porosity. When the interface bonding characterization value is between the first and second thresholds, a secondary verification is performed in combination with the amplitude attenuation coefficient, thereby improving the intelligence level of bite pile construction detection.

[0046] Furthermore, the present invention determines that the cause of the defect of pile B is local mud inclusion or excessive initial setting of pile A through the horizontal displacement value of the pile top. The mud inclusion phenomenon usually occurs in the local area of ​​the bite interface between pile B and pile A, forming a discontinuous weak interlayer. The bonding force between the concrete in the mud inclusion area and the bite surface of pile A is lost, but it does not affect the overall anti-lateral stiffness of the pile body. The rest of the pile body still provides effective support, and the overall displacement is controllable. When the ultra-slow concrete of pile A is prolonged due to excessive retarder, the hardening process will be accelerated once it starts to solidify. When pile B is cut, pile A has been over-hardened, resulting in the inability to effectively fit the bite surface. The bite surface slips under horizontal load, and the root cause of the defect is accurately distinguished, thereby achieving targeted repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of a method for constructing retaining walls using interlocking piles according to an embodiment of the present invention;

[0048] Figure 2 This is a flow chart of an embodiment of the present invention for determining whether the preparation of pile A meets the preset standards;

[0049] Figure 3 This is a flow chart of an embodiment of the present invention for determining whether the preparation of the B pile meets the preset standard based on the interface bonding characterization value of the B pile;

[0050] Figure 4 Schematic diagram of the construction position of the interlocking pile according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0052] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0053] It should be pointed out that the data in this embodiment are all obtained by comprehensive analysis and evaluation of the historical test data of the present invention in the three months before this test and the corresponding historical test results. Those skilled in the art can understand that the method of determining the above-mentioned single parameter of the method of the present invention can be to select the value with the highest proportion as the preset standard parameter according to the data distribution, use weighted summation to use the obtained value as the preset standard parameter, substitute each historical data into a specific formula and use the value obtained by the formula as the preset standard parameter or other selection methods, as long as the method of the present invention can clearly define the different specific situations in the single determination process through the obtained value.

[0054] See also Figure 1 As shown, an embodiment of the present invention provides a method for constructing interlocking piles for constructing a retaining wall, comprising:

[0055] Step S1: placing a casing on a pipe rolling machine and drilling the casing downward to a set depth to obtain a pile hole A;

[0056] Step S2: placing a conduit into the hole of pile A and pouring super-slow concrete, obtaining the initial setting time of the super-slow concrete and the maximum vertical deviation during the casing extraction process, and obtaining the structural stability characterization value of pile A;

[0057] Step S3, when it is determined that the preparation of pile A does not meet the preset standard according to the structural stability characterization value of pile A, the amount of retarder added to the super-slow setting concrete is increased or the extraction rate of the casing of the next batch is reduced;

[0058] Step S4, when it is determined that the preparation of the A pile meets the preset standard, obtaining a plurality of A piles;

[0059] Step S5, using a casing drill to cut the concrete on both sides of the adjacent A pile to form a B pile hole;

[0060] Step S6: lowering the steel cage and pouring ordinary concrete to form pile B, obtaining the sound velocity of the ultrasonic wave at several sound velocity measurement points of pile B, and obtaining the interface bonding characterization value;

[0061] Step S7: when it is determined that the construction of pile B does not meet the preset standard based on the interface combination characterization value, a secondary determination is made as to whether the construction of pile B meets the preset standard based on the amplitude attenuation coefficient, or the reason why the construction of pile B does not meet the preset standard is determined based on the pile top horizontal displacement value;

[0062] Step S8: When it is determined that the construction of pile B meets the preset standard, the construction of the target occlusal pile is completed.

[0063] See also Figure 2 As shown, the process of determining whether the preparation of pile A meets the preset standard based on the structural stability characterization value of pile A includes:

[0064] The structural stability characterization value is compared with the first preset structural stability characterization value of 0.82 and the second preset structural stability characterization value of 1.23 respectively;

[0065] If the structural stability characterization value is less than the first preset structural stability characterization value, it is determined that the preparation of pile A meets the preset standard;

[0066] If the structural stability characterization value is greater than or equal to the first preset structural stability characterization value and less than the second preset structural stability characterization value, it is determined that the preparation of pile A does not meet the preset standard, and the amount of retarder added to the ultra-slow setting concrete is increased according to the difference between the first preset structural stability characterization value and the structural stability characterization value;

[0067] If the structural stability characterization value is greater than or equal to the second preset structural stability characterization value, it is determined that the preparation of pile A does not meet the preset standard, and the extraction rate of the next casing is reduced according to the difference between the structural stability characterization value and the second preset structural stability characterization value.

[0068] In this embodiment, the value range of the first preset structural stability characterization value is (0.60, 0.90), and the value range of the second preset structural stability characterization value is (1.10, 1.30). Preferably, the first preset structural stability characterization value is selected as 0.82, and the second preset structural stability characterization value is selected as 1.23.

[0069] Specifically, by obtaining the initial setting time of ultra-retarded concrete and the maximum vertical deviation when the casing is pulled out in real time, the structural stability characterization value is calculated, and the preparation effect of pile A is determined based on the structural stability characterization value. The amount of retarder added or the casing extraction rate is dynamically adjusted, thereby improving construction efficiency.

[0070] Specifically, there are several ways to increase the amount of retarder added to the super-slow setting concrete, among which:

[0071] If the structural stability difference is less than the first preset structural stability difference of 0.15, the amount of the retarder added to the ultra-slow setting concrete is increased to a corresponding value using the first preset addition amount adjustment coefficient of 1.02;

[0072] If the structural stability difference is greater than or equal to the first preset structural stability difference and less than the second preset structural stability difference of 0.31, the amount of the retarder added to the ultra-retarded concrete is increased to a corresponding value using the second preset addition amount adjustment coefficient of 1.04;

[0073] If the structural stability difference is greater than or equal to the second preset structural stability difference, the amount of the retarder added to the ultra-slow setting concrete is increased to a corresponding value using a third preset addition adjustment coefficient of 1.06;

[0074] The structural stability difference is the difference between the first preset structural stability characterization value and the structural stability characterization value.

[0075] Specifically, the structural stability characterization value is determined by the initial setting time of the ultra-slow setting concrete and the maximum verticality deviation during the casing extraction process.

[0076] Specifically, the process of obtaining the maximum verticality deviation of the casing includes:

[0077] Install dual-axis inclination sensors symmetrically on the outer wall of the casing, at a height of 1 / 3 from the top;

[0078] During the casing extraction process, the X-axis inclination angle θ1 and the Y-axis inclination angle θ2 were synchronously recorded at a sampling frequency of 10 Hz;

[0079] The verticality deviation is the square root of the sum of the squares of θ1 and θ2;

[0080] The maximum verticality deviation is the maximum value of the verticality deviation.

[0081] Specifically, the initial setting time is measured by a penetration resistance meter to obtain the penetration resistance. When the resistance reaches 3.5 MPa, the corresponding time required is the initial setting time.

[0082] In this embodiment, the structural stability characterization value is calculated by the following formula:

[0083] Where W represents the structural stability characterization value; α represents the first weight coefficient, which is set to 0.6; t0 represents the preset initial setting time, which is set to 60h; t1 represents the initial setting time; β represents the second weight coefficient, which is set to 0.4; θ0 represents the preset verticality deviation, which is set to 0.5%; θ max Indicates the maximum vertical deviation.

[0084] See also Figure 3 As shown, the process of determining whether the preparation of pile B meets the preset standard based on the interface bonding characterization value of pile B includes:

[0085] The interface binding characterization value is compared with a first preset interface binding threshold of 15% and a second preset interface binding threshold of 30%, respectively;

[0086] If the interface binding characteristic value is less than the first preset interface binding threshold, it is determined that the preparation of the B pile meets the preset standard;

[0087] If the interface bonding characteristic value is greater than or equal to the first preset interface bonding threshold and less than the second preset interface bonding threshold, it is determined that the preparation of the B pile does not meet the preset standard, and a second determination is made based on the amplitude attenuation coefficient of the B pile whether the preparation of the B pile meets the preset standard;

[0088] If the interface bonding characterization value is greater than or equal to the second preset interface bonding threshold, it is determined that the preparation of the B pile does not meet the preset standard, and the reason why the preparation of the B pile does not meet the preset standard is determined based on the pile top horizontal displacement value of the B pile.

[0089] In this embodiment, the value range of the first preset interface combination threshold is (10%, 20%), and the value range of the second preset interface combination threshold is (25%, 35%). Preferably, the first preset interface combination threshold is selected as 15%, and the second preset interface combination threshold is selected as 30%.

[0090] Specifically, the interface bonding characterization value is calculated based on the number of sound velocity measurement points of pile B that failed the test (the sound velocity at the measurement point was less than the preset sound velocity). The sound velocity is a direct reflection of the density and internal defects of concrete. By counting the proportion of unqualified sound velocity measurement points, the overall quality uniformity of pile B can be objectively reflected.

[0091] Specifically, the interface bonding characterization value of the B pile is determined by the number of sound velocity measurement points where the sound velocity is less than a preset sound velocity of 3500 m / s.

[0092] Specifically, the process of obtaining the interface binding characterization value of the B pile includes:

[0093] Arrange several sound velocity measurement points at equal intervals along the depth direction of pile B;

[0094] Use an ultrasonic detector to measure the sound velocity at each point;

[0095] The interface bonding characterization value is the ratio between the number of sound speed measurement points at which the sound speed is less than the preset sound speed of 3500 m / s and the total number of sound speed measurement points.

[0096] In this embodiment, ordinary concrete is used for pile B of the interlocking pile, and the concrete strength grade thereof is selected as C25. The sound velocity range of the concrete strength grade C25 is (3300 m / s, 3800 m / s). Preferably, the preset sound velocity is selected as 3500 m / s.

[0097] In a specific embodiment, 160 sound velocity measurement points are arranged at equal intervals along the depth direction of pile B; the sound velocity of each point is measured using an ultrasonic detector; the sound velocity of each point is compared with a preset sound velocity, and the number of sound velocity measurement points of pile B with unqualified sound velocity (the sound velocity of the measurement point is less than the preset sound velocity) is 24; the interface bonding characterization value is the ratio of the number of unqualified sound velocity measurement points (24) to the 160 sound velocity measurement points, that is, the interface bonding characterization value is 15%.

[0098] Specifically, the amplitude attenuation coefficient of pile B is used to determine whether the preparation of pile B meets the preset standard.

[0099] If the amplitude attenuation coefficient is less than the preset amplitude attenuation coefficient of 0.75, it is determined that the preparation of pile B does not meet the preset standard, and the reason for not meeting the preset standard is determined to be excessive flow of concrete resulting in pores formed inside pile B. The pouring rate of the ordinary concrete is reduced according to the difference between the preset amplitude attenuation coefficient and the amplitude attenuation coefficient;

[0100] If the amplitude attenuation coefficient is greater than or equal to the preset amplitude attenuation coefficient, it is determined that the preparation of pile B meets the preset standard.

[0101] In the embodiment of the present invention, the preset amplitude attenuation coefficient is 0.75. The preset amplitude attenuation coefficient is obtained by taking the average value of the amplitude attenuation coefficient when the amplitude fluctuation during the ultrasonic detection of pile B is within a reasonable range. However, the above value is not limited to this, and those skilled in the art can also adjust the value according to actual needs.

[0102] Specifically, according to the "Technical Regulations for Ultrasonic Detection of Concrete Defects", when there are defects inside the concrete, such as voids or cracks, the ultrasonic amplitude will decrease; by setting the amplitude attenuation coefficient to judge the preparation quality of the B pile, the preparation efficiency of the B pile is improved.

[0103] In this embodiment, the process of obtaining the amplitude attenuation coefficient includes:

[0104] Use a non-metallic ultrasonic detector to emit ultrasonic waves at the detection point on one side of the pile body, and record it as the incident amplitude;

[0105] ‌The ultrasonic signal is recorded at the receiving point symmetrical to the detection point and recorded as the received amplitude;

[0106] The amplitude attenuation coefficient is the ratio between the ultrasonic wave receiving amplitude and the incident wave amplitude of the B pile.

[0107] Specifically, the reduction amplitude of the pouring rate of the ordinary concrete is positively correlated with the amplitude attenuation difference, wherein the positive correlation can be, for example, a linear positive correlation or a nonlinear positive correlation, and the linear slope of the linear positive correlation is not specifically limited. It can be understood that the greater the amplitude attenuation difference, the greater the reduction amplitude of the pouring rate of the ordinary concrete; the amplitude attenuation difference is the difference between the preset amplitude attenuation coefficient and the amplitude attenuation coefficient.

[0108] Specifically, the process of determining the reason why the preparation of pile B does not meet the preset standard based on the horizontal displacement value of the pile top of pile B includes:

[0109] If the horizontal displacement value of the pile top is less than the preset horizontal displacement value of 7 mm, it is determined that the preparation of pile B does not meet the preset standard because pile B has local mud inclusions;

[0110] If the pile top horizontal displacement value is greater than or equal to the preset horizontal displacement value, it is determined that the preparation of pile B does not meet the preset standard because the initial setting time of pile A is too long, and the amount of retarder added to the ultra-slow setting concrete is corrected according to the difference between the pile top horizontal displacement value and the preset horizontal displacement value;

[0111] The horizontal displacement value of the pile top of pile B is obtained by a total station.

[0112] In this embodiment, the preset horizontal displacement value is selected as 7 mm, but the above value is not limited thereto, and those skilled in the art can also adjust the value according to actual needs.

[0113] Specifically, there are several addition amount correction methods for the correction of the retarder addition amount of the super-slow setting concrete, among which:

[0114] If the pile top horizontal displacement difference is less than the first preset pile top horizontal displacement difference of 2.5 mm, the amount of retarder added to the super-retarded concrete is corrected to the corresponding value using a first correction coefficient of 0.98;

[0115] If the pile top horizontal displacement difference is greater than or equal to the first preset pile top horizontal displacement difference and less than the second preset pile top horizontal displacement difference of 4.8 mm, then the retarder addition amount of the super-retarded concrete is corrected to the corresponding value using the second correction coefficient of 0.96;

[0116] If the pile top horizontal displacement difference is greater than or equal to the second preset pile top horizontal displacement difference, the amount of retarder added to the super-retarded concrete is corrected to a corresponding value using a third correction coefficient of 0.94;

[0117] The pile top horizontal displacement difference is the difference between the pile top horizontal displacement value and the preset horizontal displacement value.

[0118] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0119] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for constructing interlocking piles for building retaining walls, characterized in that: include: Place the casing on the pipe rolling machine and drill it down to the set depth to obtain pile hole A; placing a conduit into the hole of pile A and pouring super-slow setting concrete, obtaining the initial setting time of the super-slow setting concrete and the maximum verticality deviation during the casing withdrawal process, and calculating the structural stability characterization value of pile A; When it is determined based on the structural stability characterization value of pile A that the preparation of pile A does not meet the preset standard, the amount of retarder added to the super-slow setting concrete is increased or the extraction rate of the casing of the next batch is reduced; When it is determined that the preparation of the A pile meets the preset standard, a plurality of A piles are obtained; Using a casing drill to cut the concrete on both sides of the adjacent pile A to form a pile hole B; Lower the steel cage and pour ordinary concrete to form pile B, obtain the sound velocity of the ultrasonic wave at several sound velocity measurement points of pile B, and calculate the interface bonding characterization value; When it is determined that the construction of pile B does not meet the preset standard based on the interface bonding characterization value, a secondary determination is made as to whether the construction of pile B meets the preset standard based on the amplitude attenuation coefficient, or the reason why the construction of pile B does not meet the preset standard is determined based on the pile top horizontal displacement value; When it is determined that the construction of pile B meets the preset standards, the construction of the target occlusal pile is completed; The structural stability characterization value is calculated by the following formula: , Where W represents the structural stability characterization value; α represents the first weight coefficient; t0 represents the preset initial setting time; t1 represents the initial setting time; β represents the second weight coefficient; θ0 represents the preset verticality deviation; θ max Indicates the maximum vertical deviation; The interface bonding characterization value is a ratio between the number of sound speed measurement points where the sound speed is less than a preset sound speed and the total number of sound speed measurement points.

2. The method for constructing retaining walls using interlocking piles according to claim 1, wherein: The process of determining whether the preparation of pile A meets the preset standard according to the structural stability characterization value of pile A includes: Comparing the structural stability characterization value with the first preset structural stability characterization value and the second preset structural stability characterization value respectively; If the structural stability characterization value is less than the first preset structural stability characterization value, it is determined that the preparation of pile A meets the preset standard; If the structural stability characterization value is greater than or equal to the first preset structural stability characterization value and less than the second preset structural stability characterization value, it is determined that the preparation of pile A does not meet the preset standard, and the amount of retarder added to the ultra-slow setting concrete is increased according to the difference between the first preset structural stability characterization value and the structural stability characterization value; If the structural stability characterization value is greater than or equal to the second preset structural stability characterization value, it is determined that the preparation of pile A does not meet the preset standard, and the extraction rate of the next casing is reduced according to the difference between the structural stability characterization value and the second preset structural stability characterization value.

3. The method for constructing retaining walls using interlocking piles according to claim 2, wherein: There are several ways to increase the amount of the retarder added to the super-slow setting concrete, and each way has a different increase in the amount of the retarder added.

4. The method for constructing retaining walls using interlocking piles according to claim 3, wherein: The structural stability characterization value is determined by the initial setting time of the ultra-slow concrete and the maximum verticality deviation during the casing extraction process.

5. The method for constructing retaining walls using interlocking piles according to claim 4, wherein: The process of determining whether the preparation of the B pile meets the preset standard based on the interface bonding characterization value of the B pile includes: comparing the interface binding characterization value with a first preset interface binding threshold and a second preset interface binding threshold, respectively; If the interface binding characteristic value is less than the first preset interface binding threshold, it is determined that the preparation of the B pile meets the preset standard; If the interface bonding characteristic value is greater than or equal to the first preset interface bonding threshold and less than the second preset interface bonding threshold, it is determined that the preparation of the B pile does not meet the preset standard, and a second determination is made based on the amplitude attenuation coefficient of the B pile whether the preparation of the B pile meets the preset standard; If the interface bonding characterization value is greater than or equal to the second preset interface bonding threshold, it is determined that the preparation of the B pile does not meet the preset standard, and the reason why the preparation of the B pile does not meet the preset standard is determined based on the pile top horizontal displacement value of the B pile.

6. The method for constructing retaining walls using interlocking piles according to claim 5, wherein: The interface bonding characterization value of the B pile is determined by the number of sound velocity measurement points where the sound velocity is less than a preset sound velocity.

7. The method for constructing retaining walls using interlocking piles according to claim 6, wherein: If the amplitude attenuation coefficient of pile B is less than the preset amplitude attenuation coefficient, it is determined that the preparation of pile B does not meet the preset standard, and the reason for not meeting the preset standard is that the concrete flows too fast, resulting in pores formed inside pile B, and the pouring rate of the ordinary concrete is reduced according to the difference between the preset amplitude attenuation coefficient and the amplitude attenuation coefficient; The amplitude attenuation coefficient is the ratio between the ultrasonic wave receiving amplitude and the incident wave amplitude of the B pile.

8. The method for constructing retaining walls using interlocking piles according to claim 7, wherein: The reduction range of the pouring rate of the ordinary concrete is positively correlated with the amplitude attenuation difference, and the amplitude attenuation difference is the difference between the preset amplitude attenuation coefficient and the amplitude attenuation coefficient.

9. The method for constructing retaining walls using interlocking piles according to claim 8, wherein: The reasons why the preparation of pile B does not meet the preset standards are determined based on the horizontal displacement value of the pile top, including: If the horizontal displacement value of the pile top is less than the preset horizontal displacement value, it is determined that the preparation of pile B does not meet the preset standard because pile B has local mud inclusions. If the pile top horizontal displacement value is greater than or equal to the preset horizontal displacement value, it is determined that the preparation of pile B does not meet the preset standard because the initial setting time of pile A is too long, and the amount of retarder added to the ultra-slow setting concrete is corrected according to the difference between the pile top horizontal displacement value and the preset horizontal displacement value; The horizontal displacement value of the pile top of pile B is obtained by a total station.

10. The method for constructing retaining walls using interlocking piles according to claim 9, wherein: There are several addition amount correction methods for correcting the addition amount of the retarder of the ultra-slow setting concrete, and each addition amount correction method has a different correction range for the addition amount of the retarder of the ultra-slow setting concrete.

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