A method and system for measuring the coaxiality of inner and outer core piles of a binary composite pile

Abstract

The present invention discloses a method and system for measuring the coaxiality of inner and outer core piles of a binary composite pile. Based on a distance measurement model, the distances from the inner surface of the outer core pile to the contact surface of the soil surrounding the pile at the depths of n groups of acoustic emitters and acoustic receivers and the measured distances between the n groups of acoustic emitters and acoustic receivers are calculated. The distances from the inner surface of the outer core pile to the contact surface of the soil surrounding the pile at the depths of the n groups of acoustic emitters and acoustic receivers are substituted into a cross-sectional measurement model to calculate the cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section near the jth binary composite pile at the center of the first group of binary composite piles. The coaxiality is calculated based on the mean of the measured cross-sectional areas. When the coaxiality is 0, the outer and inner core piles in the binary composite pile at the center of the circle are coaxial. The present invention not only fully utilizes the inner core pipe pile, saving engineering costs, but also does not damage the binary composite pile itself. It also provides a quantitative research method for studying the degree to which practical engineering problems such as skewed and tilted piles affect the bearing capacity of binary composite piles.

Description

Technical Field

[0001] The invention relates to a method and a system for measuring the coaxiality of inner and outer core piles of a binary composite pile, belonging to the technical field of pile foundation detection. Background Art

[0002] A binary composite pile is a pile constructed by combining two of the following: bulk piles, flexible piles, and rigid piles, creating a complementary reinforcement effect. Bulk piles are made from loose materials such as gravel, sand, brick and tile fragments, steel slag, and slag; flexible piles are made from a mixture of cement, lime, and other binders with soil; and rigid piles are made from materials such as concrete, steel, and a mixture of cement, fly ash, and crushed stone.

[0003] Deep, soft soil layers are widespread in my country's coastal areas, while inland areas are dotted with soft clay layers formed by river and lake sedimentation. These soft soils are characterized by high water content, large porosity, strong compressibility, low permeability, and low strength. To meet engineering construction requirements for design bearing capacity and settlement, composite piles are often used to reinforce soft soil foundations.

[0004] Taking the flexible-rigid composite piles made from cement-soil mixing piles and prestressed concrete pipe piles as an example, after the cement-soil mixing piles are constructed, prestressed high-strength concrete pipe piles are concentrically driven before the cement sets, integrating them with the cement-soil mixing piles. This method combines the advantages of both cement-soil piles and precast pipe piles, avoiding the problems of low cross-sectional strength of cement-soil piles and waste of pipe pile material strength. It fully utilizes the strength and rigidity advantages of precast pipe piles and the high side friction resistance of cement-soil mixing piles.

[0005] In recent years, with the continuous improvement of reinforced composite pile construction technology and processes, the actual engineering application of reinforced composite piles has been increasing. Numerous engineering applications of this type of pile have been found in Yunnan, Sichuan, Zhejiang, Jiangsu, Shanghai, Guangdong, and Hainan provinces in my country. However, in many actual engineering applications, pipe piles are prone to quality issues such as skew and deviation during the insertion process, which can easily lead to adverse effects such as surrounding ground uplift and uneven stress. Currently, no research has been conducted on the phenomenon in which the inner and outer core pile positions deviate from the ideal state due to problems such as pipe pile deflection and cement-soil mixing pile extrusion.

[0006] This invention proposes the concept of coaxiality between the inner and outer cores of a binary composite pile and proposes a measurement method. Its purpose is to provide a measurement method for binary composite piles, such as rigid composite piles, in practical engineering applications and to provide a basis for quality inspection and evaluation. Summary of the Invention

[0007] Purpose: To improve the quality inspection system for binary composite piles, the concept of composite pile coaxiality is proposed. The present invention provides a method and system for measuring the coaxiality of the inner and outer core piles of a binary composite pile.

[0008] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is:

[0009] In a first aspect, a method for measuring the coaxiality of inner and outer core piles of a binary composite pile comprises:

[0010] Step 1: Obtain the time from n groups of sound emission to reception.

[0011] Step 2: Obtain the speed of sound waves propagating in the outer core pile, inner core pile, and soil surrounding the piles.

[0012] Step 3: Obtain the radial length of the soil surrounding a pair of binary composite piles consisting of the binary composite pile at the center of the circle and the j-th binary composite pile on the circumference.

[0013] Step 4: Substitute the time from the emission to the reception of the n sets of sound waves, the speed of sound waves propagating in the outer core pile, inner core pile, and soil surrounding the piles, the distance from the inner surface to the outer surface of the inner core pile, and the radial length of the soil surrounding the two binary composite piles into the distance measurement model to solve the distance from the inner surface of the outer core pile to the soil surrounding the piles at the depth of the n sets of sound transmitters and sound receivers, and the measured distance between the n sets of sound transmitters and sound receivers.

[0014] Step 5: Substitute the distance from the inner surface of the outer core pile to the contact surface of the soil surrounding the pile at the depth of the n groups of acoustic transmitters and acoustic receivers into the cross-sectional measurement model, and calculate the cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section close to the jth binary composite pile at the center of the first group of binary composite piles.

[0015] Step 6: Repeat steps 1 to 5 to calculate the cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section close to the jth binary composite pile at the center of the M group of circles.

[0016] Step 7: Calculate the average cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section of the binary composite pile at the center of the M group of circles close to the j-th binary composite pile to obtain the average measured cross-sectional area.

[0017] Step 8: Calculate the coaxiality based on the average value of the measured cross-sectional area. When the coaxiality is 0, the outer core pile and the inner core pile in the binary composite pile at the center of the circle are coaxial.

[0018] As a preferred solution, the distance measurement model expression is as follows:

[0019]

[0020] in, It is the distance from the inner surface of the core pile to its outer surface.

[0021] is the distance from the inner surface of the outer core pile to the contact surface of the soil around the pile at the depth of the i-th group of sound transmitters and sound receivers.

[0022] It is the radial length of the soil around a pair of binary composite piles.

[0023] is the measured distance between the sound transmitter and the sound receiver of the i-th group.

[0024] is the time from the emission to the reception of the i-th group of sound.

[0025] is the speed of sound waves propagating in the outer core pile.

[0026] is the speed of sound waves propagating in the core pile.

[0027] is the speed of sound waves propagating in the soil around the pile.

[0028] The serial numbers of the sound emitters and sound receivers are counted from top to bottom with the pile head as the reference, and the value range is 0-n.

[0029] As a preferred solution, the cross-section measurement model expression is as follows:

[0030]

[0031] in, ; ;

[0032] Where, is the depth of the i-th group of sound transmitters and sound receivers in the vertical direction.

[0033] is the depth of the i+1th group of sound transmitters and sound receivers in the vertical direction.

[0034] It is the distance between two sound transmitters or two sound receivers in the vertical direction.

[0035] It is the variable of depth in the vertical direction based on the pile head.

[0036] It is the integral term of the depth in the vertical direction based on the pile head.

[0037] It is the cross-sectional area of the outer core pile between the inner core pile and the soil around the pile on the composite section of the binary composite pile close to the jth binary composite pile at the center of the circle. The value range of j is 1-M.

[0038] is the distance from the inner surface of the outer core pile to the contact surface of the soil around the pile at the depth of the i-th group of sound transmitters and sound receivers.

[0039] It is the distance from the inner surface of the outer core pile to the contact surface of the soil around the pile at the depth of the i+1th group of sound transmitters and sound receivers.

[0040] As a preferred solution, the expression for the mean value of the measured area is as follows:

[0041]

[0042] Where, is the mean value of the measured cross-sectional area.

[0043] As a preferred solution, the coaxiality expression is as follows:

[0044]

[0045] Where: The cross-sectional area of the cement-soil mixing pile between the inner core pile and the outer core pile on the composite section of the binary composite pile side when the inner core pile and the outer core pile are completely coaxial.

[0046] As a preferred solution, the binary composite pile is configured as a flexible-rigid composite pile.

[0047] As a preferred solution, it also includes:

[0048] Coaxiality The closer the value is to 0, the better the coaxiality.

[0049] Coaxiality The larger the value, the worse the coaxiality.

[0050] In a second aspect, a computer-readable storage medium stores a computer program, which, when executed by a processor, implements a method for measuring the coaxiality of inner and outer core piles of a binary composite pile as described in any one of the first aspects.

[0051] According to a third aspect, a computer device includes:

[0052] Memory, used to store instructions.

[0053] The processor is configured to execute the instructions so that the computer device performs the operations of the method for measuring the coaxiality of the inner and outer core piles of a binary composite pile as described in any one of the first aspects.

[0054] Beneficial effects: The method and system for measuring the coaxiality of the inner and outer core piles of a binary composite pile provided by the present invention not only fully utilize the inner core pipe pile, such as the hollow part formed inside the PHC-AB pipe pile, thereby saving engineering costs, but also does not cause damage to the binary composite pile itself. It also provides a quantitative research method for studying the degree of influence of practical engineering problems such as skewed piles and inclined piles on the bearing capacity of binary composite piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A schematic diagram of on-site measurement of a method for measuring the coaxiality of inner and outer core piles of a binary composite pile provided by an embodiment of the present invention.

[0056] Figure 2 A schematic diagram of a test pile arrangement for a method for measuring the coaxiality of inner and outer core piles of a binary composite pile provided by an embodiment of the present invention.

[0057] Figure 3 Schematic diagram of measurement parameters of a method for measuring the coaxiality of inner and outer core piles of a binary composite pile according to an embodiment of the present invention.

[0058] Figure 4 A schematic diagram of a coaxiality measurement process of a method for measuring the coaxiality of inner and outer core piles of a binary composite pile provided by an embodiment of the present invention.

[0059] Figure numerals: 1- soil around pile, 2- cement soil mixing pile (outer core pile), 3- PHC (prestressed high strength concrete) -AB pipe pile (inner core pile), 4- sound transmitter, 5- sound receiver, 6- surface instrument. DETAILED DESCRIPTION

[0060] The following is a clear and complete description of the technical solutions in the examples of the present invention, in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0061] The present invention will be further described below with reference to specific embodiments.

[0062] Example 1:

[0063] This embodiment introduces the construction process of a method for measuring the coaxiality of inner and outer core piles of a binary composite pile, including: an outer core pile and an inner core pile; the outer core pile is a cement-soil mixing pile, and the inner core pile is a prestressed high-strength concrete-AB pipe pile (hereinafter referred to as PHC-AB pipe pile).

[0064] After the binary composite pile is completed, a hollow core is created inside the PHC-AB pipe pile, which can be used to house an acoustic transmitter / receiver (if there is no hollow core available, a hole must be drilled to bury the transmitter / receiver). The acoustic transmitter / receiver is placed on the surface of the hollow core inside the PHC-AB pipe pile. The process includes the following steps:

[0065] like Figure 1 As shown, a. Pile construction: construction of cement-soil mixing piles 2, insertion of PHC-AB pipe piles 3, and maintenance of the rigid composite pile body.

[0066] b. Preparation before measurement: Place the acoustic transmitter 4 inside the PHC-AB tubular pile 3 of pile I, and arrange the acoustic transmitters 4 at equal intervals on the inner wall from the head of the inner core pile to the tail of the outer core pile and the inner core pile composite section. Place the acoustic receiver 5 inside the PHC-AB tubular pile 3 of pile II for testing. Each acoustic receiver 5 is set at the same horizontal position as the acoustic transmitter 4 to obtain the sound wave frequency that can receive the signal. ; Using the measured sound wave frequency Calibrate its propagation velocity in three media: cement soil mixing pile 2, PHC-AB pipe pile 3 and pile surrounding soil 1 The test hole is a hollow or drilled acoustic testing tube inside the PHC-AB pile 3.

[0067] c. Test pile selection: With a rigid composite pile as the center and a specific distance as the radius, select multiple rigid composite piles on the circumference. For example, select six rigid composite piles arranged on the circumference in a plum blossom shape. Calibrate the coaxiality of the rigid composite piles at the center of the circle, such as Figure 2 As shown in the figure, the rigid composite pile at the center of the circle is marked as pile I, and the piles on the circumference used to calibrate the coaxiality of pile I are numbered as pile II, pile III, pile IV, pile V, pile VI, and pile VII.

[0068] d. Measurement: Use the horizontal measurement method to transmit a specific frequency using an acoustic transmitter 4 at different depths (spacing ≤ 2m, the actual measurement should consider the accuracy of the data and encrypt the measurement points at different depths). The sound waves are received by the acoustic receiver 5, which transmits the data to the surface instrument 6 and stores it until the composite section of the depth-covered pile is measured.

[0069] e. Post-processing: Figure 3 As shown in Figure 1, the data is processed using Formula 1 to obtain the distance from the inner surface of the cement-soil mixing pile 2 to the contact surface of the pile soil at different depths, as well as the measured distance between the acoustic transmitter 4 and the acoustic receiver 5 at different depths. Then, the area of the cement-soil mixing pile between the PHC-AB pipe pile and the pile soil on the composite section near the side of pile II is obtained according to Formula 2:

[0070] (1)

[0071] (2)

[0072] in, ; ;

[0073] Where: , is an unknown quantity, and the rest are known quantities or have been measured through steps a and b. , , It is obtained by solving formula (1).

[0074] is the distance from the inner surface to the outer surface of the PHC-AB pile.

[0075] is the distance from the inner surface of the cement-soil mixing pile to the contact surface of the soil around the pile at the depth of the i-th group of sound transmitters and sound receivers.

[0076] It is the distance from the inner surface of the cement-soil mixing pile to the contact surface of the soil around the pile at the depth of the i+1th group of sound transmitters and sound receivers.

[0077] is the radial length of the soil around the two rigid composite piles.

[0078] is the measured distance between the sound transmitter and the sound receiver of the i-th group.

[0079] is the time from the emission to the reception of the i-th group of sound.

[0080] is the speed of sound waves propagating in cement-soil mixing piles.

[0081] is the speed of sound wave propagation in PHC-AB pile.

[0082] is the speed of sound waves propagating in the soil around the pile.

[0083] The serial numbers of the sound emitters and sound receivers are counted from top to bottom with the pile head as the reference, and the value range is 0-n.

[0084] is the depth of the i-th group of sound transmitters and sound receivers in the vertical direction.

[0085] is the depth of the i+1th group of sound transmitters and sound receivers in the vertical direction.

[0086] It is the distance between two sound transmitters or two sound receivers in the vertical direction, which is generally 2m. During actual measurement, the data accuracy requirements can be appropriately encrypted.

[0087] It is the variable of depth in the vertical direction based on the pile head.

[0088] It is the integral term of the depth in the vertical direction based on the pile head.

[0089] S j is the cross-sectional area of the cement-soil mixing pile between the PHC-AB pipe pile and the soil around the pile on the composite section of pile I near pile j.

[0090] is the serial number of the rigid composite pile on the circumference, Ⅱ, Ⅲ, ⋯, VII.

[0091] f. Measurement: Repeat steps d and e, using piles III, IV, V, VI, and VII ( Figure 2 )PileⅠ( Figure 2 ) is calibrated to obtain S j ( III, IV, ⋯, VII).

[0092] g. Calculation of coaxiality: Use formula 3 to calculate the cross-sectional area S obtained by using six rigid composite piles on the circumference. j Take the weighted average , and then use formula 4 to calculate the coaxiality of pile Ⅰ :

[0093] (3)

[0094] (4)

[0095] Where: When the PHC-AB pipe pile and the cement-soil mixing pile are completely coaxial, the cross-sectional area of the cement-soil mixing pile between the PHC-AB pipe pile and the soil around the pile on the composite section of the rigid composite pile is calculated by (the diameter of the cement-soil mixing pile is PHC-AB pipe pile diameter) * composite section length calculation, the parameters in the formula are all known quantities and can be obtained from the design drawings; is the mean value of the measured cross-sectional area.

[0096] Coaxiality When the value is 0, the PHC-AB pipe pile and the cement-soil mixing pile in the composite pile I are considered to be coaxial; The closer the value is to 0, the better the coaxiality between the PHC-AB pipe pile and the cement-soil mixing pile in composite pile I is; The larger the value, the worse the coaxiality between the PHC-AB pipe pile and the cement-soil mixing pile in composite pile I.

[0097] On the basis of the above scheme, if a natural hollow core cannot be formed inside the composite pile after the pile is formed, it is necessary to add the operation of drilling and burying the acoustic detection tube in the step b; the horizontal measurement spacing in the step d is generally taken as 2m. If the data is more accurate in the actual measurement, the measurement points should be appropriately encrypted; the oblique side method (angle ≤ 30°) can also be used for measurement in the step d; according to the step e, the cement soil mixing pile 2 ( Figure 1 ) The distance from the inner surface to the pile soil contact surface and the acoustic emitter 4 at different depths ( Figure 1 ) and sound receiver 5 ( Figure 1 ) between the measured distance; obtain the coaxiality of pile I through step eg .

[0098] On the basis of the above scheme, six rigid composite piles (piles II, III, IV, V, VI, VII) arranged in a plum blossom shape on the circumference of the circle were used to calibrate the area of the cement-soil mixing pile between the PHC-AB pipe pile and the soil around the pile at the center of the circle (pile I) to evaluate the coaxiality of pile I. .

[0099] On the basis of the above scheme, the sound transmitter and the sound receiver should be attached to the surface of the natural hollow core formed inside the PHC-AB pipe pile.

[0100] In step e, the following assumptions should be made: 1) Assume that the density of the soil around the pile is constant, that is, is a constant; 2) Assuming that the propagation medium is uniform, that is, is a constant; 3) Assume that the cement-soil mixing piles (2) and PHC-AB pipe piles (3) inside piles I and II are symmetrically distributed, that is, are the same value.

[0101] Example 2:

[0102] This embodiment introduces a method for measuring the coaxiality of the inner and outer core piles of a binary composite pile. Figure 4 As shown, specifically including:

[0103] Step 1: Obtain the time from n groups of sound emission to reception.

[0104] Step 2: Obtain the speed of sound waves propagating in the outer core pile, inner core pile, and soil surrounding the piles.

[0105] Step 3: Obtain the radial length of the soil surrounding a pair of binary composite piles consisting of the binary composite pile at the center of the circle and the j-th binary composite pile on the circumference.

[0106] Step 4: Substitute the time from the emission to the reception of the n sets of sound waves, the speed of sound waves propagating in the outer core pile, inner core pile, and soil surrounding the piles, the distance from the inner surface to the outer surface of the inner core pile, and the radial length of the soil surrounding the two binary composite piles into the distance measurement model to solve the distance from the inner surface of the outer core pile to the soil surrounding the piles at the depth of the n sets of sound transmitters and sound receivers, and the measured distance between the n sets of sound transmitters and sound receivers.

[0107] Step 5: Substitute the distance from the inner surface of the outer core pile to the contact surface of the soil surrounding the pile at the depth of the n groups of acoustic transmitters and acoustic receivers into the cross-sectional measurement model, and calculate the cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section close to the jth binary composite pile at the center of the first group of binary composite piles.

[0108] Step 6: Repeat steps 1 to 5 to calculate the cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section close to the jth binary composite pile at the center of the M group of circles.

[0109] Step 7: Calculate the average cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section of the binary composite pile at the center of the M group of circles close to the j-th binary composite pile to obtain the average measured cross-sectional area.

[0110] Step 8: Calculate the coaxiality based on the average value of the measured cross-sectional area. When the coaxiality is 0, the outer core pile and the inner core pile in the binary composite pile at the center of the circle are coaxial.

[0111] Furthermore, the distance measurement model expression is as follows:

[0112]

[0113] in, It is the distance from the inner surface of the core pile to its outer surface.

[0114] is the distance from the inner surface of the outer core pile to the contact surface of the soil around the pile at the depth of the i-th group of sound transmitters and sound receivers.

[0115] It is the radial length of the soil around a pair of binary composite piles.

[0116] is the measured distance between the sound transmitter and the sound receiver of the i-th group.

[0117] is the time from the emission to the reception of the i-th group of sound.

[0118] is the speed of sound waves propagating in the outer core pile.

[0119] is the speed of sound waves propagating in the core pile.

[0120] is the speed of sound waves propagating in the soil around the pile.

[0121] The serial numbers of the sound emitters and sound receivers are counted from top to bottom with the pile head as the reference, and the value range is 0-n.

[0122] Furthermore, the cross-section measurement model expression is as follows:

[0123]

[0124] in, ; ;

[0125] Where, is the depth of the i-th group of sound transmitters and sound receivers in the vertical direction.

[0126] is the depth of the i+1th group of sound transmitters and sound receivers in the vertical direction.

[0127] It is the distance between two sound transmitters or two sound receivers in the vertical direction.

[0128] It is the variable of depth in the vertical direction based on the pile head.

[0129] It is the integral term of the depth in the vertical direction based on the pile head.

[0130] It is the cross-sectional area of the outer core pile between the inner core pile and the soil around the pile on the composite section of the binary composite pile close to the jth binary composite pile at the center of the circle. The value range of j is 1-M.

[0131] is the distance from the inner surface of the outer core pile to the contact surface of the soil around the pile at the depth of the i-th group of sound transmitters and sound receivers.

[0132] It is the distance from the inner surface of the outer core pile to the contact surface of the soil around the pile at the depth of the i+1th group of sound transmitters and sound receivers.

[0133] Furthermore, the expression of the mean value of the measured area is as follows:

[0134]

[0135] Where, is the mean value of the measured cross-sectional area.

[0136] Furthermore, the coaxiality expression is as follows:

[0137]

[0138] Where: The cross-sectional area of the cement-soil mixing pile between the inner core pile and the outer core pile on the composite section of the binary composite pile side when the inner core pile and the outer core pile are completely coaxial.

[0139] Example 3:

[0140] This embodiment introduces a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for measuring the coaxiality of the inner and outer core piles of a binary composite pile as described in any one of the embodiments 2 is implemented.

[0141] Example 4:

[0142] This embodiment introduces a computer device, including:

[0143] Memory, used to store instructions.

[0144] The processor is configured to execute the instructions so that the computer device performs the operation of the method for measuring the coaxiality of the inner and outer core piles of a binary composite pile as described in any one of the embodiments 2.

[0145] Example 5:

[0146] This embodiment introduces an example application of the method of the present invention. In recent years, with the promotion and application of binary composite piles, more and more engineering projects in coastal areas of my country have adopted composite piles to reinforce the foundation. Taking the flexible and rigid composite pile as an example, this type of pile often adopts a construction process of controlling the concentricity of the inner and outer core piles during on-site construction to ensure and control the coaxiality of the inner and outer core piles as much as possible. However, some scholars have found that deflection still occurs during the actual insertion of the pipe pile, resulting in the coaxial state of the composite pile not being able to reach the ideal state.

[0147] The method provided by the present invention for measuring the coaxiality of the inner and outer core piles of a flexible-rigid composite pile can be used to study the influence of coaxiality on the service performance of the composite pile, including the vertical ultimate bearing capacity, horizontal ultimate bearing capacity, load-displacement curve, etc.; it can be used to evaluate the construction quality of the pile foundation, determine the risk level after the pile is completed, and provide a quality inspection and evaluation method for the service status of the composite pile after the pile foundation is completed.

[0148] The present invention provides a method for measuring the coaxiality of the inner and outer cores of a flexible-rigid composite pile. The outer core is a cement-soil mixing pile 2, and the inner core is a PHC-AB pipe pile 3. The flexible-rigid composite pile is composed of the cement-soil mixing pile 2 and the PHC-AB pipe pile 3. The soil surrounding the composite pile is referred to as pile surrounding soil 1. The cross-sections of the cement-soil mixing pile 2 and the PHC-AB pipe pile 3 are annular. After the composite pile is formed, the PHC-AB pipe pile 3 has a natural hollow core. The measurement device includes an acoustic transmitter 4, an acoustic receiver 5, and a surface instrument 6. The acoustic transmitter 4 and acoustic receiver 5 are arranged on the surface of the natural hollow core formed within the PHC-AB pipe pile 3.

[0149] The method for measuring the coaxiality of a flexible-rigid composite pile comprises the following steps:

[0150] S1: With a rigid composite pile as the center of the circle and a specific distance (2800 mm in this embodiment) as the radius, six rigid composite piles are arranged on the circumference in a plum blossom pattern. The coaxiality of the rigid composite pile at the center of the circle is calibrated using these six rigid composite piles. The rigid composite pile at the center of the circle is marked as pile I, and the piles on the circumference used to calibrate the coaxiality of pile I are numbered as pile II, pile III, pile IV, pile V, pile VI, and pile VII, respectively.

[0151] S2: Determine the parameters of the PHC-AB pipe pile (outer diameter 400mm, inner diameter 200mm, pile length 20m) and the cement-soil mixing pile (pipe diameter 800mm, pile length 30m), prefabricate the PHC-AB pipe pile, determine the pile center points of the cement-soil mixing pile and the PHC-AB pipe pile, measure the distance between the two pile center points, complete the cement-soil mixing pile construction on site, insert the PHC-AB pipe pile, and maintain the pile for 28 days after completion.

[0152] S3: Place the sound transmitter and the sound receiver on the natural hollow surface of the PHC-AB pipe piles of piles I and II respectively to test and obtain the sound wave frequency that can receive the signal .

[0153] S4: Use the sound wave frequency measured in step S3 Calibrate its propagation velocity in three media: cement-soil mixing pile, PHC-AB pipe pile and pile surrounding soil , respectively 4.5×10 6 mm / s, 3.5×10 6 mm / s, 1.5×10 6 mm / s.

[0154] S5: Use the horizontal measurement method to transmit specific frequencies at different depths (spacing ≤ 2m, the actual measurement should consider the accuracy of the data and encrypt the measurement points at different depths) using an acoustic transmitter The sound is detected and received by an acoustic receiver, which transmits the data to the surface instrument and stores it until the composite section of the pile is measured in depth.

[0155] S6: Use Equation 1 to process the data and obtain the distance from the inner surface of the cement-soil mixing pile (2) to the contact surface of the pile soil at different depths when j = II, and the distance from the inner surface of the PHC-AB pipe pile (3) to the inner surface of the cement-soil mixing pile (2). The calculation steps are as follows:

[0156]

[0157] in, 200mm;

[0158] 2000mm;

[0159] , , 4.5×10 6 mm / s, 3.5×10 6 mm / s, 1.5×10 6 mm / s;

[0160] The value range is 0-10, with a total of 11 groups of sound transmitters and sound receivers;

[0161] t Ⅱ = [0.00165, 0.00166, 0.00167, 0.00168, 0.00169, 0.00170, 0.00171,0.00172, 0.00173, 0.00174, 0.00175].

[0162] Substituting this into the equations, we can obtain:

[0163] y Ⅱ = [399, 416, 434, 451, 469, 486, 504, 521, 539, 556, 574];

[0164] s Ⅱ = [3197, 3232, 3267, 3302, 3337, 3372, 3407, 3442, 3477, 3512,3547].

[0165] S7: Based on Equation 2, calculate the cross-sectional area of the cement-soil mixing pile between the PHC-AB pipe pile and the surrounding soil in the composite section of Pile I near Pile II. The calculation steps are as follows:

[0166]

[0167] in, ;

[0168] =2000*i, unit: mm;

[0169] It is 2000mm.

[0170] After substituting, we can get: S Ⅱ = 9722222mm 2 .

[0171] S8: Repeat steps S5-S7, and use piles III, IV, V, VI, and VII to calibrate the coaxiality of pile I, and obtain S j ( III, IV, ⋯, VII).

[0172] t Ⅲ = [0.00171200, 0.00171000, 0.00170800, 0.00170600, 0.00170400,0.00170200, 0.00170000, 0.00169800, 0.00169600, 0.00169400, 0.00169200],S Ⅲ =9792222mm 2 ;

[0173] t Ⅳ = [0.00163100, 0.00163300, 0.00163500, 0.00163700, 0.00163900,0.00164100, 0.00164300, 0.00164500, 0.00164700, 0.00164900, 0.00165100],S Ⅳ =7657222mm 2 ;

[0174] t Ⅴ = [0.00165235, 0.00166300, 0.00167365, 0.00168430, 0.00169495,0.00170560, 0.00171625, 0.00172690, 0.00173755, 0.00174820, 0.00175885],S Ⅴ =9918222mm 2 ;

[0175] tⅥ = [0.00166531, 0.00166053, 0.00165575, 0.00165097, 0.00164619,0.00164141, 0.00163663, 0.00163185, 0.00162707, 0.00162229, 0.00161751], S Ⅵ =7671572mm 2 ;

[0176] t Ⅶ = [0.00163200, 0.00163432, 0.00163664, 0.00163896, 0.00164128,0.00164360, 0.00164592, 0.00164824, 0.00165056, 0.00165288, 0.00165520],S Ⅶ =7748222mm 2 .

[0177] S9: The cross-sectional area S obtained by using formulas 3 and 4 using six rigid composite piles on the circumference j Take the weighted average , calculate its coaxiality with pile Ⅰ The calculation steps are as follows:

[0178]

[0179]

[0180] Where S = 8000000mm 2 , = 8751614mm 2 .

[0181] Coaxiality Conc = 9.40%.

[0182] For the calculation process of the above specific embodiment, the parameters of the specific embodiment can be input and the following code can be used to solve:

[0183]

[0184]

[0185] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0186] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0187] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0188] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0189] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for measuring the coaxiality of inner and outer core piles of a binary composite pile, characterized by: Specifically include: Step 1: Obtain the time from n groups of sound emission to reception; Step 2: Obtain the propagation speed of the sound wave in the outer core pile, inner core pile, and soil around the pile; Step 3: Obtain the radial length of the soil surrounding a pair of binary composite piles consisting of the binary composite pile at the center of the circle and the j-th binary composite pile on the circumference; Step 4: Substitute the time from the n sets of sound emission to reception, the speed of sound waves propagating in the outer core pile, inner core pile, and soil surrounding the piles, the distance from the inner surface to the outer surface of the inner core pile, and the radial length of the soil surrounding the two binary composite piles into the distance measurement model to solve for the distance from the inner surface of the outer core pile to the soil surrounding the piles at the depth of the n sets of sound emitters and sound receivers, and the measured distance between the n sets of sound emitters and sound receivers; Step 5: Substitute the distance from the inner surface of the outer core pile to the contact surface of the soil surrounding the pile at the depth of the n-th group of acoustic transmitters and receivers into the cross-sectional measurement model, and calculate the cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section of the first group of binary composite piles at the center of the circle close to the j-th binary composite pile; Step 6: Repeat steps 1 to 5 to calculate the cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section near the jth binary composite pile at the center of the M group of circles; Step 7: Calculate the average cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section of the binary composite pile at the center of the M group of circles close to the j-th binary composite pile, and obtain the average value of the measured cross-sectional area; Step 8: Calculate the coaxiality based on the average value of the measured cross-sectional area. When the coaxiality is 0, the outer core pile and the inner core pile in the binary composite pile at the center of the circle are coaxial.

2. A method for measuring the coaxiality of inner and outer core piles of a binary composite pile according to claim 1, characterized in that: The distance measurement model expression is as follows: ； in, is the distance from the inner surface of the core pile to its outer surface; is the distance from the inner surface of the outer core pile to the contact surface of the soil around the pile at the depth of the i-th group of sound transmitters and sound receivers; is the radial length of the soil surrounding a pair of binary composite piles; is the measured distance between the sound transmitter and the sound receiver of the i-th group; is the time from the emission to the reception of the i-th group of sound; is the speed of sound waves propagating in the outer core pile; is the speed of sound waves propagating in the core pile; is the speed of sound waves propagating in the soil around the pile; The serial numbers of the sound emitters and sound receivers are counted from top to bottom with the pile head as the reference, and the value range is 0-n.

3. The method for measuring the coaxiality of the inner and outer core piles of a binary composite pile according to claim 1, characterized in that: The cross-sectional measurement model expression is as follows: ； in, ; ; Where, is the depth of the i-th group of sound transmitters and sound receivers in the vertical direction; is the depth of the i+1th group of sound transmitters and sound receivers in the vertical direction; is the distance between two sound transmitters or two sound receivers in the vertical direction; is the variable of the depth in the vertical direction based on the pile head; is the integral term of the depth in the vertical direction based on the pile head; is the cross-sectional area of the outer core pile between the inner core pile and the soil surrounding the pile on the composite section of the binary composite pile close to the jth binary composite pile at the center of the circle, and the value of j ranges from 1 to M; is the distance from the inner surface of the outer core pile to the contact surface of the soil around the pile at the depth of the i-th group of sound transmitters and sound receivers; It is the distance from the inner surface of the outer core pile to the contact surface of the soil around the pile at the depth of the i+1th group of sound transmitters and sound receivers.

4. The method for measuring the coaxiality of the inner and outer core piles of a binary composite pile according to claim 1, wherein: The expression for the mean value of the measured cross-sectional area is as follows: ； Where, is the mean value of the measured cross-sectional area.

5. The method for measuring the coaxiality of the inner and outer core piles of a binary composite pile according to claim 1, characterized in that: The coaxiality expression is as follows: ； Where: The cross-sectional area of the cement-soil mixing pile between the inner core pile and the outer core pile on the composite section of the binary composite pile side when the inner core pile and the outer core pile are completely coaxial.

6. The method for measuring the coaxiality of the inner and outer core piles of a binary composite pile according to claim 1, characterized in that: The binary composite pile is configured as a flexible and rigid composite pile.

7. A method for measuring the coaxiality of inner and outer core piles of a binary composite pile according to any one of claims 1 to 6, characterized in that: Also includes: Coaxiality The closer the value is to 0, the better the coaxiality; Coaxiality The larger the value, the worse the coaxiality.

8. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, a method for measuring the coaxiality of inner and outer core piles of a binary composite pile as claimed in any one of claims 1 to 7 is implemented.

9. A computer device, characterized in that: include: a memory for storing instructions; The processor is configured to execute the instructions so that the computer device performs the operation of the method for measuring the coaxiality of the inner and outer core piles of a binary composite pile as described in any one of claims 1 to 7.

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