A real-time measuring device for soil plug height in pipe pile driving test

Abstract

The application discloses a real-time measuring device for soil plug height in pipe pile sinking test, which comprises a pile end connecting piece, a controllable sliding rail, a tension wire displacement meter, a pulley assembly, a steel strand and a counterweight block. The pile end connecting piece comprises a pile connecting disc with a through hole in the center, and uniformly distributed screw holes in the circumference are used for fixed connection with the pipe pile end. The controllable sliding rail is vertically arranged on the outer periphery of the pile end connecting piece. The tension wire displacement meter is fixed on the controllable sliding rail and is height-adjustable. The pulley assembly comprises a first pulley and a second pulley. The first pulley is arranged at the bottom of the controllable sliding rail, and the second pulley is installed in the through hole of the pile connecting disc. One end of the steel strand is connected with the tension wire displacement meter, and the steel strand is sequentially wound around the first pulley and the second pulley and then vertically extended downward. The counterweight block is connected with the free end of the steel strand, and a threaded spike is fixed at the bottom center of the counterweight block. The application breaks through the limitation of traditional manual measurement and realizes continuous, automatic and high-precision monitoring of the soil plug height in the pipe pile sinking process.

Description

Technical Field

[0001] This application relates to the field of pipe pile construction technology, and in particular to a real-time measuring device for the height of the soil plug in a pipe pile driving test. Background Technology

[0002] In the construction of pipe piles, especially open steel pipe piles or prestressed concrete pipe piles, the height of the soil plug formed inside the pile pipe is a key parameter affecting the feasibility of pile driving (e.g., the closure effect leading to a sharp increase in resistance), the final bearing capacity of the pile foundation (accounting for approximately 20% to 40% of the bearing capacity), and construction safety (e.g., the soil squeezing effect). Its dynamic variation urgently needs to be accurately captured. Traditional measurement methods have the following shortcomings:

[0003] Manual rope measurement method: requires stopping drilling and lowering the measurement rope, interrupting construction and resulting in scattered data. It relies on manual operation, has low accuracy and efficiency, and poses high risks for offshore operations.

[0004] Side wall opening observation method: destroys the structural integrity of pipe pile and cannot be adapted to inclined pile driving conditions;

[0005] Existing visualization technologies (such as transparent model piles) cannot be applied to actual engineering projects.

[0006] Current technologies struggle to achieve continuous, non-destructive, and high-precision soil plug monitoring under conditions of strong vibration and high humidity. This results in a lack of data support for research on the dynamic formation mechanism of soil plugs, leading to an insufficient understanding of the soil plug phenomenon and a lack of consensus on its formation mechanism. Furthermore, the soil plug effect is related to numerous factors such as pile diameter, friction coefficient, and soil properties, making the soil plug effect of pipe piles in coral reef debris layers extremely complex. Therefore, further research is needed to explore the different factors influencing the soil plug effect from multiple perspectives.

[0007] Therefore, there is an urgent need for a device that can continuously, in real time, accurately, automatically, and non-destructively measure the height of soil plugs in complex construction environments with high vibration and strong interference. Utility Model Content

[0008] To address the aforementioned problems, this application provides a real-time measurement device for the soil plug height in pipe pile driving tests. This device enables continuous, real-time, accurate, automated, and non-destructive measurement of the soil plug height under complex construction environments characterized by high vibration and strong interference. The technical solution is as follows:

[0009] This application provides a real-time measuring device for the soil plug height in a pipe pile driving test, comprising a pile end connector, a controllable slide rail, a pulley displacement meter, a steel strand, and a counterweight. The pile end connector includes a pile receiving plate with a central through hole and circumferentially distributed threaded holes for fixed connection with the end of the pipe pile. The controllable slide rail is vertically arranged around the outer periphery of the pile end connector. The pulley displacement meter is fixed on the controllable slide rail and its height is adjustable. The pulley assembly includes a first pulley and a second pulley. The first pulley is installed at the bottom of the controllable slide rail, and the second pulley is installed in the through hole of the pile receiving plate. One end of the steel strand is connected to the pulley displacement meter, passes around the first pulley and the second pulley in sequence, and extends vertically downward. The counterweight is connected to the free end of the steel strand, and a threaded needle is fixed at the center of the bottom of the counterweight.

[0010] For example, in a real-time measuring device for the soil plug height of the pipe pile driving test provided in one embodiment, the pile end connector includes a sleeve, the pile receiving plate is fixed in the middle of the sleeve, the sleeve is sleeved on the end of the pipe pile, and the pile receiving plate is covered on the end face of the pipe pile.

[0011] For example, in one embodiment of the real-time measuring device for the height of the soil plug in the pipe pile driving test, the controllable slide rail is vertically arranged on the outer periphery of the casing, and the bottom of the controllable slide rail is flush with the pile receiving plate.

[0012] For example, in one embodiment of the real-time measuring device for the height of the soil plug in the pile driving test, a radial groove is provided on the surface of the pile receiving plate for the steel strand to be connected from the first pulley to the second pulley. The length of the groove is equal to the radius of the pile receiving plate, and the width is 1.5-2 times the diameter of the steel strand.

[0013] For example, in one embodiment of the real-time measuring device for the height of the soil plug in the pipe pile driving test, the controllable slide rail is provided with a height adjustment and locking mechanism, which can realize continuous height adjustment of the wire displacement gauge.

[0014] For example, in one embodiment of the real-time measuring device for the height of the soil plug in the pile driving test, the threaded shovel and the counterweight are connected by a detachable thread, and the diameter of the threaded shovel is clearance-fitted with the center hole diameter of the counterweight.

[0015] For example, in one embodiment of the real-time measuring device for the height of the soil plug in the pile driving test, the tip of the threaded needle is provided with a tapered self-tapping thread with a length of not less than 50 mm, which is used to resist the displacement caused by pile driving vibration.

[0016] For example, in the real-time measuring device for the height of the soil plug in the pile driving test provided in one embodiment, the pile connecting plate and the controllable slide rail are connected by detachable welding, the weld height is ≥5mm, and the welding strength is not lower than the strength of the base material.

[0017] For example, in one embodiment of the real-time measuring device for the height of the soil plug in the pile driving test, the inner wall of the through hole of the pile receiving plate is fitted with a wear-resistant bushing, and the second pulley is fixed in the wear-resistant bushing by a rotating shaft.

[0018] This application provides a real-time measurement device for the height of the soil plug in a pipe pile driving test, which can continuously, in real time, accurately, automatically, and non-destructively measure the height of the soil plug in complex construction environments with high vibration and strong interference. It offers the following technical advantages: The threaded pin embedding design allows for self-tapping thread embedding into the soil plug, resisting pile driving vibration displacement (offset < 0.1mm); the double pulley and counterweight guiding system ensures the verticality of the steel strand (angle ≤ 1°), eliminating measurement errors caused by friction; the controllable slide rail and detachable pile connector adapt to φ300-1200mm pipe piles, with an installation time of < 5 minutes; the use of a pull-wire displacement gauge to record the shrinkage length of the steel strand in real time to calculate the change in soil plug height, revealing the abrupt change law of the soil plug (such as the jump growth of coral reef strata); the mechanical passive structure reduces costs, resists electromagnetic interference, and is suitable for harsh environments such as deep-sea piling. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the real-time measurement device for the soil plug height in the pipe pile driving test of this application;

[0021] Figure 2 This is a schematic diagram showing the usage status of the real-time measurement device for the soil plug height in the pile driving test of this application. Detailed Implementation

[0022] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0023] This application provides a real-time measurement device for the soil plug height in a pipe pile driving test, such as... Figure 1-2 As shown, it includes:

[0024] The pile end connector 100 includes a pile receiving plate 110 with a central through hole 111 and circumferentially distributed screw holes for fixed connection with the end of the pipe pile 200.

[0025] A controllable slide rail 300 is vertically installed on the outer periphery of the pile end connector 100;

[0026] A draw wire displacement meter 400 is fixed on the controllable slide rail 300 and its height is adjustable;

[0027] The pulley assembly 500 includes a first pulley 510 and a second pulley 520. The first pulley 510 is installed at the bottom of the controllable slide rail 300, and the second pulley 520 is installed in the through hole 111 of the pile receiving plate 110.

[0028] The steel strand 600 is connected at one end to the pulley displacement meter 400, and extends vertically downward after passing through the first pulley 510 and the second pulley 520 in sequence.

[0029] A counterweight 700 is connected to the free end of the steel strand 600, and a threaded needle 710 is fixed at the center of the bottom of the counterweight 700.

[0030] This application discloses a real-time measurement device for the soil plug height during pipe pile driving tests. The height of the pull-wire displacement meter 400 is adjusted via a controllable slide rail 300. A steel strand 600 is guided by a pulley assembly 500 and connected to a counterweight 700. A threaded shovel 710 at the bottom of the counterweight 700 is embedded in the soil plug 800. During pile driving, the pipe pile 200 moves the entire device downwards, and the soil layer 900 outside the pile seeps into the pipe pile 200, forming the soil plug 800 inside the pile. The downward movement of the pipe pile 200 and the rise of the soil plug 800 cause the steel strand 600 to retract. The pull-wire displacement meter 400 records the displacement in real time and converts it into the soil plug height. The use of a threaded shovel fixing technology overcomes the measurement offset caused by pile driving vibration. The double pulley design ensures the verticality of the steel strand and reduces friction, ensuring the steel strand is parallel to the pile driving direction. The integrated bolt fixing mechanism on the pile connector plate is adaptable to various pipe pile specifications. This device achieves continuous, high-precision measurement of the soil plug height and its rate of change, providing dynamic parameter support for the study of the soil plug effect.

[0031] For example, in the real-time measurement device for the soil plug height in the pile driving test provided in one embodiment, such as Figure 1-2 As shown, the pile end connector 100 includes a sleeve 120, and the pile receiving plate 110 is fixedly disposed in the middle of the sleeve 120. The sleeve 120 is sleeved onto the end of the pipe pile 200, and the pile receiving plate 110 covers the end face of the pipe pile. According to the above embodiment, the entire device can be detachably installed on the top of the pipe pile 200 through the pile end connector 100, and sinks synchronously with the pipe pile 200 during pile driving.

[0032] For example, in the real-time measurement device for the soil plug height in the pile driving test provided in one embodiment, such as Figure 1-2 As shown, the controllable slide rail 300 is vertically arranged on the outer periphery of the sleeve 120, and the bottom of the controllable slide rail 300 is flush with the pile receiving plate 110.

[0033] For example, in the real-time measurement device for the soil plug height in the pile driving test provided in one embodiment, such as Figure 1-2 As shown, a radial groove 112 is provided on the surface of the pile receiving plate 110 to allow the steel strand to be connected from the first pulley 510 to the second pulley 520. The length of the groove 112 is equal to the radius 110 of the pile receiving plate, and the width is 1.5-2 times the diameter of the steel strand. The radial groove 112 avoids the steel strand 600, preventing the pile end from squeezing the steel strand during pile driving.

[0034] For example, in one embodiment of the real-time measuring device for the height of the soil plug in the pipe pile driving test, the controllable slide rail 300 is provided with a height adjustment and locking mechanism, which can realize continuous height adjustment of the wire displacement meter 400.

[0035] Among them, the controllable slide rail 300 is an aluminum alloy guide rail with a locking mechanism, which enables millimeter-level precise height adjustment of the wire displacement meter to adapt to different pile depths.

[0036] For example, in one embodiment of the real-time measuring device for the soil plug height in a pipe pile driving test, the threaded shovel 710 and the counterweight 700 are connected by a detachable thread, and the diameter of the threaded shovel 710 is clearance-fitted with the center hole diameter of the counterweight 700. According to the above embodiment, by designing the threaded shovel 710 and the counterweight 700 as a detachable connection structure, damaged shovels can be quickly replaced, reducing maintenance costs.

[0037] For example, in one embodiment of the real-time measuring device for the soil plug height during pile driving tests, the threaded shovel 710 has a tapered self-tapping thread at its tip with a length of not less than 50 mm to resist displacement caused by pile driving vibration. According to the above embodiment, the tapered self-tapping thread (L≥50mm) enhances the embedment depth, resists vibration and settlement of the coral reef debris layer, and the threaded shovel 710 is inserted into the soil layer outside the pile to fix the position of the counterweight and prevent displacement.

[0038] For example, in the real-time measuring device for the height of the soil plug in the pile driving test provided in one embodiment, the pile connecting plate 110 and the controllable slide rail 300 are detachably welded together, the weld height is ≥5mm, and the welding strength is not lower than the strength of the base material.

[0039] For example, in one embodiment of the real-time measuring device for the height of the soil plug in a pipe pile driving test, a wear-resistant bushing is embedded in the inner wall of the through hole 111 of the pile receiving plate 110, and the second pulley 520 is fixed in the wear-resistant bushing via a rotating shaft. By embedding a wear-resistant bushing in the inner wall of the through hole 111, the wear rate of the pulley is reduced, and the service life of the device is extended.

[0040] The real-time measurement device for soil plug height in pipe pile driving tests proposed in this application solves the problems of low accuracy and poor safety of traditional intermittent measurement, breaks through the limitations of traditional manual measurement, and is suitable for the study of soil plug effect in open steel pipe piles and concrete pipe piles. It has the advantages of real-time continuous monitoring, simple structure, low cost, and industrial reproducibility.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A real-time measuring device for the height of the soil plug in a pipe pile driving test, characterized in that, include: The pile end connector includes a pile receiving plate with a central through hole and circumferentially distributed bolt holes for fixed connection with the end of the pipe pile. A controllable slide rail is vertically installed on the outer periphery of the pile end connector; A wire displacement meter is fixed on the controllable slide rail and its height is adjustable; The pulley assembly includes a first pulley and a second pulley, wherein the first pulley is installed at the bottom of the controllable slide rail and the second pulley is installed in the through hole of the pile receiving plate; The steel strand, with one end connected to the pulley displacement gauge, extends vertically downwards after passing around the first pulley and the second pulley in sequence. A counterweight is connected to the free end of the steel strand, and a threaded pin is fixed at the center of the bottom of the counterweight.

2. The real-time measuring device for the soil plug height in the pipe pile driving test according to claim 1, characterized in that, The pile end connector includes a sleeve, the pile receiving plate is fixed in the middle of the sleeve, the sleeve is sleeved on the end of the pipe pile, and the pile receiving plate is covered on the end face of the pipe pile.

3. The real-time measuring device for the soil plug height in the pipe pile driving test according to claim 2, characterized in that, The controllable slide rail is vertically arranged on the outer periphery of the sleeve, and the bottom of the controllable slide rail is flush with the pile receiving plate.

4. The real-time measuring device for the soil plug height in the pipe pile driving test according to claim 1, characterized in that, A radial groove is provided on the surface of the pile receiving plate to allow the steel strand to connect from the first pulley to the second pulley. The length of the groove is equal to the radius of the pile receiving plate, and the width is 1.5-2 times the diameter of the steel strand.

5. The real-time measuring device for the soil plug height in the pipe pile driving test according to claim 1, characterized in that, The controllable slide rail is equipped with a height adjustment and locking mechanism, which enables continuous height adjustment of the wire displacement meter.

6. The real-time measuring device for the soil plug height in the pipe pile driving test according to claim 1, characterized in that, The threaded skewer and the counterweight are connected by a detachable thread, and the diameter of the threaded skewer is clearance-fitted with the center hole diameter of the counterweight.

7. The real-time measuring device for the soil plug height in the pipe pile driving test according to claim 1, characterized in that, The threaded probing needle tip is provided with a tapered self-tapping thread with a length of not less than 50mm, which is used to resist displacement caused by pile driving vibration.

8. The real-time measuring device for the soil plug height in the pipe pile driving test according to claim 1, characterized in that, The pile receiving plate and the controllable slide rail are connected by detachable welding, with a weld height of ≥5mm and a welding strength not lower than the strength of the base material.

9. The real-time measuring device for the soil plug height in a pipe pile driving test according to claim 1, characterized in that, The inner wall of the through hole of the pile receiving plate is fitted with a wear-resistant bushing, and the second pulley is fixed in the wear-resistant bushing by a rotating shaft.

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