A prestressed square pile construction method based on soft ground conditions

Abstract

The present invention relates to the technical field of prestressed square pile construction, and in particular to a prestressed square pile construction method based on soft ground conditions, comprising: determining pile foundation positions and points according to design requirements, marking the ground, lifting the prestressed square piles, and after determining that the verticality of the prestressed square piles meets the standards, using a drop hammer device to hammer the prestressed square piles for construction; during the construction process, for the case that the construction process of the prestressed square piles does not meet the standards, secondarily determining whether the construction process meets the standards based on the verticality of the prestressed square piles, or determining the reason why the construction process does not meet the standards based on historical penetration difference; re-determining operating parameters and re-determining according to the determined reasons, and re-determining corresponding operating parameters according to the determination results until the construction process of the prestressed square piles meets the standards, or suspending the construction, and resuming the construction after eliminating the influencing factors until the construction is completed.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed square pile construction, and in particular to a prestressed square pile construction method based on soft base geological conditions. Background Art

[0002] The construction process of prestressed piles mainly involves the construction methods of prestressed concrete pipe piles and prestressed high-strength concrete pipe piles, which aims to improve the stability and bearing capacity of the building structure, while reducing the settlement value and improving the construction efficiency. The construction process of prestressed concrete pipe piles includes two main methods: hammering method and static pressure method. The hammering method is to use a pile driver to drive the prefabricated concrete pipe piles into the ground. This method is suitable for situations where the geological conditions are relatively soft or there is a large silt layer; the static pressure method is to use static pressure equipment to directly press the prefabricated concrete pipe piles into the ground. This method is suitable for situations where the geological conditions are relatively hard. During the construction process, attention should be paid to the verticality control of the pile body and the treatment of the pile top, such as applying anti-corrosion paint, to ensure the quality and durability of the pile foundation.

[0003] Chinese Patent Publication No.: CN117328452A discloses a construction method of prestressed pipe piles, including: measuring and placing pile positions at the construction site; using a pile driver to lift the pipe pile, inserting the pile tip of the pipe pile vertically to the pile position into the soil; inserting the pile cap after placing a pile pad on the pile top, the center line of the pile cap coincides with the center line of the pile body of the pipe pile, and placing a hammer pad on the pile cap; after the hammer pad is placed, cold hammer 2-3 times to make the pipe pile enter the soil and fix the position, check the verticality of the pipe pile, the verticality deviation of the pipe pile shall not be greater than 1% of the pile length of the pipe pile, and pile driving is carried out after checking the verticality of the pipe pile, and the inclination rate of the pile body shall not exceed 0.8%; when the pipe pile is driven to the preset bearing layer or reaches the preset penetration value, the hammer can be withdrawn. The construction method provided by the embodiment of the present invention reduces the construction difficulty and improves the bearing capacity of the pipe pile.

[0004] It can be seen that the construction method of the prestressed pipe piles has the following problems: although the patent has made detailed provisions on the construction process of the prestressed pipe piles, the construction process of the prestressed pipe piles is not monitored, and it is impossible to determine whether the prestressed pipe piles always meet the standards during the construction process, and thus it is impossible to determine the construction quality and safety of the pipe piles. Summary of the invention

[0005] To this end, the present invention provides a prestressed square pile construction method based on soft base geological conditions, so as to overcome the problem in the prior art that the construction process of the prestressed pipe piles is not monitored, and it is impossible to determine whether the prestressed pipe piles always meet the standards during the construction process, thereby being unable to determine the construction engineering quality and safety of the prestressed pipe piles.

[0006] To achieve the above object, the present invention provides a prestressed square pile construction method based on soft ground conditions, comprising:

[0007] Step S1, determine the position and layout of the pile foundation according to the design requirements, mark the ground, lift the prestressed square pile, lower the prestressed square pile to the marked point on the ground, determine that the verticality of the prestressed square pile meets the standard, and use a drop hammer device to hammer the prestressed square pile to construct the prestressed square pile;

[0008] Step S2, during the construction process of the prestressed square pile, judging whether the construction process of the prestressed square pile in the detection period meets the standard based on the penetration difference in each detection period; for a single detection period, the penetration difference corresponding to the detection period is the difference between the penetration of the prestressed square pile in the period and the penetration of the previous period;

[0009] Step S3, in the case that the construction process of the prestressed square pile does not meet the standards, secondarily determining whether the construction process of the prestressed square pile meets the standards based on the verticality of the prestressed square pile, or determining the reason why the construction process of the prestressed square pile does not meet the standards based on the historical penetration difference;

[0010] Step S4, re-determining the operating parameters of the corresponding components during the construction process according to the determined reasons, wherein the operating parameters of the corresponding components include the frequency of hammer drop and the height of a single hammer drop;

[0011] Step S5, after completing the determination of the corresponding operating parameters, re-determine whether the construction process of the prestressed square piles meets the standards based on the penetration difference of the next cycle, and re-determine the corresponding operating parameters according to the determination result until the construction process of the prestressed square piles after the operating parameters are determined to meet the standards, or, issue a notice to suspend construction; after issuing the notice to suspend construction and eliminating the influencing factors, resume construction until the construction is completed.

[0012] Furthermore, during the construction process of the prestressed square pile, a detection cycle is set, the penetration of the prestressed square pile in each detection cycle is recorded respectively, and based on the obtained penetration difference, it is determined whether the construction process of the prestressed square pile in the corresponding detection cycle meets the standard, wherein, for the penetration difference corresponding to a single detection cycle,

[0013] If the penetration difference is greater than or equal to the first preset difference, it is determined that the construction process of the prestressed square pile does not meet the standard, and based on the verticality of the prestressed square pile, it is secondarily determined whether the construction process of the prestressed square pile meets the standard;

[0014] If the penetration difference is less than the first preset difference and greater than or equal to the second preset difference, it is determined that the construction process of the prestressed square pile meets the standard, and the construction process of the prestressed square pile is continuously monitored;

[0015] If the penetration difference is less than or equal to the second preset difference and greater than the third preset difference, it is determined that the construction process of the prestressed square pile does not meet the standard, and whether a penetration stage change occurs is determined based on the penetration ratio, wherein the penetration ratio is the ratio of the penetration to the total length of the prestressed square pile;

[0016] If the penetration difference is less than or equal to the third preset difference, it is determined that the construction process of the prestressed square pile does not meet the standard, and the reason why the construction process of the prestressed square pile does not meet the standard is determined based on the historical penetration difference.

[0017] Furthermore, the process of secondarily determining whether the construction process of the prestressed square pile meets the standard based on the verticality of the prestressed square pile includes:

[0018] Detecting and recording the verticality of the prestressed square piles;

[0019] If the verticality is less than or equal to the preset verticality, it is determined that the construction process of the prestressed square pile meets the standard;

[0020] If the verticality is greater than the preset verticality, it is determined that the construction process of the prestressed square pile does not meet the standard for the second time, and a construction suspension notice is issued until the verticality of the prestressed square pile is corrected.

[0021] Further, the process of determining whether a change in penetration stage occurs based on the penetration ratio includes:

[0022] calculating the penetration ratio;

[0023] If the penetration ratio is greater than a preset penetration ratio, it is determined that a penetration stage change occurs in the construction process of the prestressed square pile, and the second preset difference is corrected based on the difference percentage between the penetration ratio and the preset penetration ratio, and whether the construction process of the prestressed square pile meets the standard is re-determined based on the corrected second preset difference, wherein the difference percentage is the ratio of the difference between the penetration ratio and the preset penetration ratio to the preset penetration ratio;

[0024] If the penetration ratio is less than or equal to the preset penetration ratio, it is determined that the penetration stage of the construction process of the prestressed square pile has not changed, and the construction process of the prestressed square pile is determined to be non-compliant with the standard and the reason why the construction process of the prestressed square pile does not meet the standard is determined based on the historical penetration difference.

[0025] Furthermore, the process of correcting the second preset difference value based on the difference percentage between the penetration ratio and the preset penetration ratio includes:

[0026] If the difference percentage is less than or equal to the preset difference percentage, the second preset difference is corrected using the first difference correction coefficient;

[0027] If the difference percentage is greater than the preset difference percentage, the second preset difference is corrected using a second difference correction coefficient.

[0028] Further, the process of determining the reason why the construction process of the prestressed square pile does not meet the standard based on the historical penetration difference includes:

[0029] Draw the detection period-penetration difference curve based on the historical penetration difference;

[0030] Sequentially obtaining the slopes of the time nodes in the curve corresponding to each of the detection cycles;

[0031] Calculate the absolute value of the difference between two adjacent slopes;

[0032] If the absolute value is less than or equal to the preset absolute value, it is determined that the reason why the construction process of the prestressed square pile does not meet the standard is that the hammer drop frequency does not meet the standard, and the hammer drop frequency is adjusted based on the cumulative number of hammer drops;

[0033] If the absolute value is greater than the preset absolute value, it is determined that the reason why the construction process of the prestressed square pile does not meet the standards is that the soil condition detection does not meet the standards, and it is determined whether to issue a construction suspension notice based on the penetration value.

[0034] Further, the process of determining the hammer drop frequency of the next detection cycle based on the accumulated number of hammer drops includes:

[0035] If the cumulative number of hammer drops is less than or equal to the critical number of hammer drops, the first frequency correction coefficient is used to correct the hammer drop frequency of the next detection cycle, wherein the critical number of hammer drops is the sum of the standard hammer drops of the current detection cycle and each detection cycle before the current detection cycle;

[0036] If the cumulative number of hammer drops is greater than the critical number of hammer drops, the hammer drop frequency of the next detection cycle is corrected using the second frequency correction coefficient;

[0037] Among them, the first frequency correction coefficient is greater than 1, and the second frequency correction coefficient is less than 1.

[0038] Further, the cumulative number of hammer drops is calculated based on the corrected hammer drop frequency, and whether to adjust the single hammer drop height is determined based on the comparison result between the cumulative number of hammer drops and the critical number of hammer drops, wherein:

[0039] If the cumulative number of hammer drops is greater than the critical number of hammer drops, the single hammer drop height is increased based on the proportion of the remaining hammer drops, wherein the proportion of the remaining hammer drops is the ratio of the difference between the preset number of hammer drops and the cumulative number of hammer drops to the preset number of hammer drops;

[0040] If the cumulative number of hammer drops is less than or equal to the critical number of hammer drops, it is determined that the single hammer drop height of the detection cycle meets the standard.

[0041] Furthermore, the process of increasing the height of a single hammer drop based on the remaining hammer drop times ratio includes:

[0042] If the remaining hammer drop times account for less than or equal to the preset ratio, the single hammer drop height is corrected using a first ratio correction coefficient;

[0043] If the remaining hammer drop times account for a larger proportion than the preset proportion, a second proportion correction coefficient is used to correct the single hammer drop height.

[0044] Furthermore, the penetration value of the current detection cycle is re-recorded based on the corrected single drop hammer height, and the penetration difference is calculated based on the penetration value of the previous detection cycle. According to the comparison result of the penetration difference and the preset difference, it is determined whether the construction process of the prestressed square piles meets the standards. If it still does not meet the standards, a notice of suspending construction is issued, the current soil conditions are re-tested, and the construction is resumed after the obstacles are removed.

[0045] Compared with the prior art, the beneficial effects of the present invention are that, according to the design requirements, the pile foundation position and point arrangement are determined, the ground is marked, the prestressed square piles are hoisted, and after determining that the verticality of the prestressed square piles meets the standards, the prestressed square piles are hammered using a drop hammer device for construction; during the construction process, in the case that the construction process of the prestressed square piles does not meet the standards, a secondary determination is made based on the verticality of the prestressed square piles whether the construction process meets the standards, or the reason why the construction process does not meet the standards is determined based on the historical penetration difference; the operating parameters are re-determined and re-determined according to the determined reasons, and the corresponding operating parameters are re-determined according to the determination results until the construction process of the prestressed square piles meets the standards, or the construction is suspended, and the construction is resumed after eliminating the influencing factors until the construction is completed, thereby monitoring the construction process of the prestressed square piles, determining whether the construction process of the prestressed square piles meets the standards, and adjusting the parameters for the case that the standards are not met, thereby effectively improving the construction quality and safety of the prestressed square piles.

[0046] Furthermore, the present invention determines whether the construction process of the prestressed square piles meets the standards by calculating the penetration difference in two adjacent periods, and distinguishes whether the construction process of the prestressed square piles meets the standards based on the comparison result of the penetration difference and the preset difference. For the situation of not meeting the standards, the cause is determined based on the historical penetration difference, thereby monitoring the construction process of the prestressed square piles, determining whether the construction process of the prestressed square piles meets the standards, and thus determining the construction engineering quality and safety of the prestressed square piles.

[0047] Furthermore, the present invention detects the verticality of the prestressed square piles during the construction process and compares it with the preset verticality, and determines whether the construction process of the prestressed square piles meets the standards based on the comparison results. A construction suspension notice is issued for situations where the standards are not met, and the construction is resumed after the verticality is corrected. The verticality of the prestressed square piles during the construction process is monitored to ensure that the verticality always meets the standards, thereby ensuring that the prestressed square piles meet the standards during the construction process, and can effectively improve the construction quality and safety of the prestressed square piles.

[0048] Furthermore, the present invention determines whether it is necessary to change the penetration stage based on a comparison result of the ratio of the penetration depth to the length of the prestressed square pile and a preset penetration depth ratio, and corrects the second preset difference based on the difference percentage in the case where a change in the penetration stage is determined to have occurred, and re-determines whether the construction process of the prestressed square pile meets the standard based on the corrected second preset difference, and determines the reason based on the historical penetration depth difference in the case where no change in the penetration stage has occurred, thereby monitoring the construction process of the prestressed square pile, determining whether the construction process of the prestressed square pile meets the standard, and thereby determining the construction engineering quality and safety of the prestressed square pile.

[0049] Furthermore, the present invention determines a correction coefficient for a second preset difference based on a comparison result between the difference percentage and a preset difference percentage, thereby monitoring the construction process of the prestressed square piles, determining whether the construction process of the prestressed square piles meets the standards, and thereby determining the construction engineering quality and safety of the prestressed square piles.

[0050] Furthermore, the present invention draws a detection cycle-penetration difference curve according to the historical penetration difference, and calculates the absolute value of the difference between two adjacent slopes according to the slope of the time node corresponding to each detection cycle on the curve, and determines the reason why the construction process of the prestressed square pile does not meet the standards based on the comparison result of the absolute value of the difference and the preset absolute value, and adjusts the parameters in the construction process of the prestressed square pile based on the determined reason, thereby monitoring the construction process of the prestressed square pile, and effectively improving the construction engineering quality and safety of the prestressed square pile.

[0051] Furthermore, the present invention calculates the cumulative number of hammer drops for the situation that the reason why the construction process of the prestressed square piles does not meet the standards is that the frequency of hammer drops does not meet the standards, and determines the hammer drop frequency of the next detection cycle in the construction process of the prestressed square piles based on the comparison result of the cumulative number of hammer drops and the critical number of hammer drops, thereby monitoring the construction process of the prestressed square piles, and making adjustments for the situation that does not meet the standards, thereby ensuring that the construction process of the prestressed square piles meets the standards, and effectively improving the construction quality and safety of the prestressed square piles.

[0052] Furthermore, the present invention recalculates the cumulative number of hammer drops based on the corrected hammer drop frequency, and determines whether to adjust the single hammer drop height according to the comparison result between the cumulative number of hammer drops and the critical number of hammer drops, thereby adjusting the construction process of the prestressed square piles, ensuring that the construction process of the prestressed square piles meets the standards, and effectively improving the construction quality and safety of the prestressed square piles.

[0053] Furthermore, the correction coefficient of the single hammer drop height is determined by comparing the remaining hammer drop times with the preset ratio in the present invention, so as to monitor the construction process of the prestressed square piles and make adjustments for non-standard situations, thereby ensuring that the construction process of the prestressed square piles meets the standards and effectively improving the construction quality and safety of the prestressed square piles.

[0054] Furthermore, the present invention re-records the penetration value of the current detection cycle based on the corrected single hammer drop height, and calculates the penetration difference. According to the comparison result of the penetration difference and the preset difference, it is determined whether the construction process of the prestressed square pile meets the standard. If it still does not meet the standard, a notice of suspending construction is issued, the current soil conditions are re-tested, and the construction is resumed after the obstacles are removed, thereby monitoring the construction process of the prestressed square pile, and adjusting for the non-standard conditions, so as to ensure that the construction process of the prestressed square pile meets the standard, and effectively improve the construction engineering quality and safety of the prestressed square pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a structural diagram of a prestressed square pile construction method based on soft ground conditions according to the present invention;

[0056] Figure 2 It is a flow chart of a prestressed square pile construction method based on soft ground conditions according to the present invention;

[0057] Figure 3 A flow chart of the invention for secondary determination of whether the construction process of the prestressed square pile meets the standard based on the verticality of the prestressed square pile;

[0058] Figure 4 A flow chart of correcting the second preset difference based on the difference percentage according to the present invention;

[0059] In the figure: pile driver motor 1; hammer 2; theodolite 3; prestressed square pile 4. DETAILED DESCRIPTION

[0060] 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 only used to explain the present invention and are not used to limit the present invention.

[0061] 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 protection scope of the present invention.

[0062] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0063] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] See also Figure 1 As shown, it is a structural diagram of a prestressed square pile construction method based on soft ground conditions according to the present invention, comprising:

[0065] Pile driver motor 1, used to control the construction process of prestressed square piles;

[0066] A hammer 2, which is located in the pile driver and is used to hit the prestressed square pile;

[0067] Theodolite 3, used to detect the verticality of the prestressed square piles;

[0068] Prestressed square pile 4, the object of action of the pile driver;

[0069] A detection module (not shown), which is connected to the theodolite 3 and the prestressed square pile 4, respectively, for detecting and recording data during the construction process of the prestressed square pile 4;

[0070] The central control module (not shown in the figure) is connected to the detection module and is used to analyze and adjust the construction process of the prestressed square piles according to the data recorded by the detection module.

[0071] See also Figure 2 As shown, it is a flow chart of a prestressed square pile construction method based on soft ground conditions according to the present invention, comprising:

[0072] Step S1, determine the position and layout of the pile foundation according to the design requirements, mark the ground, and the pile driver motor 1 lifts the prestressed square pile and lowers the prestressed square pile to the marked point on the ground. After the central control module determines that the verticality of the prestressed square pile meets the standard, the pile driver motor 1 uses a drop hammer device to hammer the prestressed square pile to construct the prestressed square pile;

[0073] Step S2, during the construction of the prestressed square pile, the central control module determines whether the construction process of the prestressed square pile in the detection cycle meets the standard based on the penetration difference in each detection cycle; for a single detection cycle, the penetration difference corresponding to the detection cycle is the difference between the penetration of the prestressed square pile in the cycle and the penetration of the previous cycle;

[0074] Step S3, the central control module determines whether the construction process of the prestressed square pile meets the standard based on the verticality of the prestressed square pile, or determines the reason why the construction process of the prestressed square pile does not meet the standard based on the historical penetration difference;

[0075] Step S4, the central control module re-determines the operating parameters of the corresponding components during the construction process according to the determined reasons, wherein the operating parameters of the corresponding components include the frequency of hammer drop and the height of a single hammer drop;

[0076] Step S5, after the central control module completes the determination of the corresponding operating parameters, it re-determines whether the construction process of the prestressed square piles meets the standards based on the penetration difference of the next cycle, and re-determines the corresponding operating parameters according to the determination result until the construction process of the prestressed square piles after the operating parameters are determined to meet the standards, or, issues a notice to suspend construction; after issuing the notice to suspend construction and eliminating the influencing factors, the construction is resumed until the construction is completed.

[0077] Specifically, when the detection module detects the penetration difference of the prestressed square pile in the first cycle, the penetration difference=current penetration-0.

[0078] Specifically, in the embodiment of the present invention, the central control module sets a detection cycle during the construction process of the prestressed square pile, and the detection module records the penetration of the prestressed square pile in each detection cycle. The central control module determines whether the construction process of the prestressed square pile in the corresponding detection cycle meets the standard based on the obtained penetration difference. For the penetration difference corresponding to a single detection cycle,

[0079] If the penetration difference is greater than or equal to the first preset difference, it is determined that the construction process of the prestressed square pile does not meet the standard, and based on the verticality of the prestressed square pile, it is secondarily determined whether the construction process of the prestressed square pile meets the standard;

[0080] If the penetration difference is less than the first preset difference and greater than or equal to the second preset difference, it is determined that the construction process of the prestressed square pile meets the standard, and the construction process of the prestressed square pile is continuously monitored;

[0081] If the penetration difference is less than or equal to the second preset difference and greater than the third preset difference, it is determined that the construction process of the prestressed square pile does not meet the standard, and whether a penetration stage change occurs is determined based on the penetration ratio, wherein the penetration ratio is the ratio of the penetration to the total length of the prestressed square pile;

[0082] If the penetration difference is less than or equal to the third preset difference, it is determined that the construction process of the prestressed square pile does not meet the standard, and the reason why the construction process of the prestressed square pile does not meet the standard is determined based on the historical penetration difference.

[0083] Specifically, the inspection cycle during the construction of prestressed square piles is 1 min;

[0084] Specifically, the first preset difference is 1.5 m, the second preset difference is 1 m, and the third preset difference is 0.6 m.

[0085] See also Figure 3 As shown, it is a flow chart of the invention for secondary determining whether the construction process of the prestressed square piles meets the standards based on the verticality of the prestressed square piles.

[0086] Specifically, the process of the control module in the embodiment of the present invention secondarily determining whether the construction process of the prestressed square pile meets the standard based on the verticality of the prestressed square pile includes:

[0087] Detecting and recording the verticality of the prestressed square piles;

[0088] If the verticality is less than or equal to the preset verticality, it is determined that the construction process of the prestressed square pile meets the standard;

[0089] If the verticality is greater than the preset verticality, it is determined that the construction process of the prestressed square pile does not meet the standard for the second time, and a construction suspension notice is issued until the verticality of the prestressed square pile is corrected.

[0090] Specifically, the preset verticality value is 0.5%.

[0091] Specifically, the process of determining whether a penetration stage change occurs based on the penetration ratio by the control module in the embodiment of the present invention includes:

[0092] calculating the penetration ratio;

[0093] If the penetration ratio is greater than a preset penetration ratio, it is determined that a penetration stage change occurs in the construction process of the prestressed square pile, and the second preset difference is corrected based on the difference percentage between the penetration ratio and the preset penetration ratio, and whether the construction process of the prestressed square pile meets the standard is re-determined based on the corrected second preset difference, wherein the difference percentage is the ratio of the difference between the penetration ratio and the preset penetration ratio to the preset penetration ratio;

[0094] If the penetration ratio is less than or equal to the preset penetration ratio, it is determined that the penetration stage of the construction process of the prestressed square pile has not changed, and the construction process of the prestressed square pile is determined to be non-compliant with the standard and the reason why the construction process of the prestressed square pile does not meet the standard is determined based on the historical penetration difference.

[0095] Specifically, the preset penetration ratio is 0.5.

[0096] Specifically, the process of the control module in the embodiment of the present invention correcting the second preset difference based on the difference percentage between the penetration ratio and the preset penetration ratio includes:

[0097] If the difference percentage is less than or equal to the preset difference percentage, the second preset difference is corrected using the first difference correction coefficient;

[0098] If the difference percentage is greater than the preset difference percentage, the second preset difference is corrected using a second difference correction coefficient.

[0099] Specifically, the preset difference percentage is 20%; the first difference correction coefficient is 1.1; and the second difference correction coefficient is 1.3.

[0100] Specifically, the process of determining the reason why the construction process of the prestressed square pile does not meet the standard based on the historical penetration difference by the control module in the embodiment of the present invention includes:

[0101] The central control module draws the detection cycle-penetration difference curve based on the historical penetration difference;

[0102] The central control module sequentially obtains the slopes of the time nodes in the curve corresponding to each of the detection cycles;

[0103] The central control module calculates the absolute value of the difference between two adjacent slopes;

[0104] If the absolute value is less than or equal to the preset absolute value, it is determined that the reason why the construction process of the prestressed square pile does not meet the standard is that the hammer drop frequency does not meet the standard, and the hammer drop frequency is adjusted based on the cumulative number of hammer drops;

[0105] If the absolute value is greater than the preset absolute value, it is determined that the reason why the construction process of the prestressed square pile does not meet the standards is that the soil condition detection does not meet the standards, and it is determined whether to issue a construction suspension notice based on the penetration value.

[0106] Specifically, the preset absolute value is 0.5.

[0107] Specifically, the process of determining the hammer drop frequency of the next detection cycle based on the accumulated hammer drop times by the control module in the embodiment of the present invention includes:

[0108] If the cumulative number of hammer drops is less than or equal to the critical number of hammer drops, the first frequency correction coefficient is used to correct the hammer drop frequency of the next detection cycle, wherein the critical number of hammer drops is the sum of the standard hammer drops of the current detection cycle and each detection cycle before the current detection cycle;

[0109] If the cumulative number of hammer drops is greater than the critical number of hammer drops, the hammer drop frequency of the next detection cycle is corrected using the second frequency correction coefficient;

[0110] Among them, the first frequency correction coefficient is greater than 1, and the second frequency correction coefficient is less than 1.

[0111] Specifically, the first frequency correction coefficient is 1.2; the second frequency correction coefficient is 0.8.

[0112] Specifically, the method for correcting the hammer drop frequency in the next detection cycle is that the central control module multiplies the hammer drop frequency in the current detection cycle by the frequency correction coefficient.

[0113] Specifically, the control module in the embodiment of the present invention calculates the cumulative number of hammer drops based on the corrected hammer drop frequency, and determines whether to adjust the single hammer drop height based on the comparison result of the cumulative number of hammer drops and the critical number of hammer drops, wherein:

[0114] If the cumulative number of hammer drops is greater than the critical number of hammer drops, the single hammer drop height is increased based on the proportion of the remaining hammer drops, wherein the proportion of the remaining hammer drops is the ratio of the difference between the preset number of hammer drops and the cumulative number of hammer drops to the preset number of hammer drops;

[0115] If the cumulative number of hammer drops is less than or equal to the critical number of hammer drops, it is determined that the single hammer drop height of the detection cycle meets the standard.

[0116] Specifically, the preset number of hammer drops is 2500;

[0117] Specifically, the process of increasing the height of a single hammer drop based on the remaining hammer drop times ratio by the control module in the embodiment of the present invention includes:

[0118] If the remaining hammer drop times account for less than or equal to the preset ratio, the single hammer drop height is corrected using a first ratio correction coefficient;

[0119] If the remaining hammer drop times account for a larger proportion than the preset proportion, a second proportion correction coefficient is used to correct the single hammer drop height.

[0120] Specifically, the preset proportion value is 50%;

[0121] Specifically, the first proportion correction coefficient is 1.3; the second proportion correction coefficient is 1.1.

[0122] Specifically, the control module in the embodiment of the present invention re-records the penetration value of the current detection cycle based on the corrected single drop hammer height, and calculates the penetration difference based on the penetration value of the previous detection cycle, and determines whether the construction process of the prestressed square pile meets the standard according to the comparison result of the difference result with the preset difference value. If it still does not meet the standard, a notice of suspending construction is issued, the current soil conditions are re-tested, and the construction is resumed after the obstacles are removed.

[0123] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A prestressed square pile construction method based on soft ground conditions, comprising: Step S1, determine the position and layout of the pile foundation according to the design requirements, mark the ground, lift the prestressed square pile, lower the prestressed square pile to the marked point on the ground, determine that the verticality of the prestressed square pile meets the standard, and use a drop hammer device to hammer the prestressed square pile to construct the prestressed square pile; Step S2, during the construction process of the prestressed square pile, judging whether the construction process of the prestressed square pile in the detection period meets the standard based on the penetration difference in each detection period; for a single detection period, the penetration difference corresponding to the detection period is the difference between the penetration of the prestressed square pile in the period and the penetration of the previous period; Step S3, in the case that the construction process of the prestressed square pile does not meet the standards, secondarily determining whether the construction process of the prestressed square pile meets the standards based on the verticality of the prestressed square pile, or determining the reason why the construction process of the prestressed square pile does not meet the standards based on the historical penetration difference; Step S4, re-determining the operating parameters of the corresponding components during the construction process according to the determined reasons, wherein the operating parameters of the corresponding components include the frequency of hammer drop and the height of a single hammer drop; Step S5, after the corresponding operating parameters are determined, re-determine whether the construction process of the prestressed square pile meets the standard based on the penetration difference of the next cycle, and re-determine the corresponding operating parameters according to the determination result until the construction process of the prestressed square pile after the operating parameters are determined to meet the standard, or issue a construction suspension notice; after issuing the construction suspension notice and eliminating the influencing factors, resume the construction until the construction is completed, If the cumulative number of hammer drops is less than or equal to the critical number of hammer drops, the first frequency correction coefficient is used to correct the hammer drop frequency of the next test cycle, wherein the critical number of hammer drops is the sum of the standard hammer drops of the current test cycle and each test cycle before the current test cycle; If the accumulated number of hammer drops is greater than the critical number of hammer drops, the hammer drop frequency of the next detection cycle is corrected using a second frequency correction coefficient, wherein the first frequency correction coefficient is greater than 1 and the second frequency correction coefficient is less than 1; If the cumulative number of hammer drops is greater than the critical number of hammer drops, the single hammer drop height is increased based on the proportion of the remaining hammer drops, wherein the proportion of the remaining hammer drops is the ratio of the difference between the preset number of hammer drops and the cumulative number of hammer drops to the preset number of hammer drops; If the cumulative number of hammer drops is less than or equal to the critical number of hammer drops, it is determined that the single hammer drop height of the test cycle meets the standard; If the remaining hammer drop times account for less than or equal to the preset ratio, the single hammer drop height is corrected using a first ratio correction coefficient; If the remaining hammer drop times account for a larger proportion than the preset proportion, a second proportion correction coefficient is used to correct the single hammer drop height.

2. The prestressed square pile construction method based on soft ground conditions according to claim 1 is characterized in that: During the construction process of the prestressed square pile, a detection cycle is set, the penetration of the prestressed square pile in each detection cycle is recorded respectively, and based on the obtained penetration difference, it is determined whether the construction process of the prestressed square pile in the corresponding detection cycle meets the standard, wherein, for the penetration difference corresponding to a single detection cycle, If the penetration difference is greater than or equal to the first preset difference, it is determined that the construction process of the prestressed square pile does not meet the standard, and based on the verticality of the prestressed square pile, it is secondarily determined whether the construction process of the prestressed square pile meets the standard; If the penetration difference is less than the first preset difference and greater than or equal to the second preset difference, it is determined that the construction process of the prestressed square pile meets the standard, and the construction process of the prestressed square pile is continuously monitored; If the penetration difference is less than or equal to the second preset difference and greater than the third preset difference, it is determined that the construction process of the prestressed square pile does not meet the standard, and whether a penetration stage change occurs is determined based on the penetration ratio, wherein the penetration ratio is the ratio of the penetration to the total length of the prestressed square pile; If the penetration difference is less than or equal to the third preset difference, it is determined that the construction process of the prestressed square pile does not meet the standard, and the reason why the construction process of the prestressed square pile does not meet the standard is determined based on the historical penetration difference.

3. The prestressed square pile construction method based on soft ground conditions according to claim 2 is characterized in that: The process of secondarily determining whether the construction process of the prestressed square pile meets the standard based on the verticality of the prestressed square pile includes: Detecting and recording the verticality of the prestressed square piles; If the verticality is less than or equal to the preset verticality, it is determined that the construction process of the prestressed square pile meets the standard; If the verticality is greater than the preset verticality, it is determined that the construction process of the prestressed square pile does not meet the standard for the second time, and a construction suspension notice is issued until the verticality of the prestressed square pile is corrected.

4. The prestressed square pile construction method based on soft ground conditions according to claim 2 is characterized in that: The process of determining whether a change in penetration stage occurs based on the penetration ratio includes: calculating the penetration ratio; If the penetration ratio is greater than a preset penetration ratio, it is determined that a penetration stage change occurs in the construction process of the prestressed square pile, and the second preset difference is corrected based on the difference percentage between the penetration ratio and the preset penetration ratio, and whether the construction process of the prestressed square pile meets the standard is re-determined based on the corrected second preset difference, wherein the difference percentage is the ratio of the difference between the penetration ratio and the preset penetration ratio to the preset penetration ratio; If the penetration ratio is less than or equal to the preset penetration ratio, it is determined that the penetration stage of the construction process of the prestressed square pile has not changed, and the construction process of the prestressed square pile is determined to be non-compliant with the standard and the reason why the construction process of the prestressed square pile does not meet the standard is determined based on the historical penetration difference.

5. The method for constructing prestressed square piles based on soft ground conditions according to claim 4, characterized in that: The process of correcting the second preset difference value based on the difference percentage between the penetration ratio value and the preset penetration ratio value comprises: If the difference percentage is less than or equal to the preset difference percentage, the second preset difference is corrected using the first difference correction coefficient; If the difference percentage is greater than the preset difference percentage, the second preset difference is corrected using a second difference correction coefficient.

6. The method for constructing prestressed square piles based on soft ground conditions according to claim 4, characterized in that: The process of determining the reason why the construction process of the prestressed square pile does not meet the standard based on the historical penetration difference includes: Draw the detection period-penetration difference curve based on the historical penetration difference; Sequentially obtaining the slopes of the time nodes in the curve corresponding to each of the detection cycles; Calculate the absolute value of the difference between two adjacent slopes; If the absolute value is less than or equal to the preset absolute value, it is determined that the reason why the construction process of the prestressed square pile does not meet the standard is that the hammer drop frequency does not meet the standard, and the hammer drop frequency is adjusted based on the cumulative number of hammer drops; If the absolute value is greater than the preset absolute value, it is determined that the reason why the construction process of the prestressed square pile does not meet the standards is that the soil condition detection does not meet the standards, and it is determined whether to issue a construction suspension notice based on the penetration value.

7. The method for constructing prestressed square piles based on soft ground conditions according to claim 1, characterized in that: The penetration value of the current detection cycle is re-recorded based on the corrected single drop hammer height, and the penetration difference is calculated based on the penetration value of the previous detection cycle. According to the comparison result of the difference result with the preset difference value, it is determined whether the construction process of the prestressed square pile meets the standard. If it still does not meet the standard, a notice of suspension of construction is issued, the current soil conditions are re-tested, and the construction is resumed after the obstacles are removed.

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