Vibration pile driving simulation equipment

Abstract

The present invention discloses a vibration pile driving simulation device, comprising: a pile body; an electric vibrator connected to the pile body, suitable for generating an exciting force and transmitting the exciting force to the pile body; and a soil container, suitable for containing the soil body and suitable for vertically upward movement relative to the pile body, so as to simulate the pile driving process of the pile body under the action of the exciting force. The vibration pile driving simulation device of the present invention has a simple structure and can accurately simulate the vibration pile driving process of the pile body under the action of the exciting force in reality.

Description

Technical Field

[0001] The invention relates to the technical field of vibration pile driving, and in particular to a vibration pile driving simulation device. Background Art

[0002] Steel pipe piles are widely used in foundation pit support projects of high-rise and super-high-rise buildings in lake sedimentary soil layers due to their advantages such as good pile quality, high pile shear strength, simple construction operation, and recyclability. In view of the outstanding advantages of vibration pile sinking technology such as high pile sinking efficiency and good environmental protection, it has been widely used in the field of steel pipe pile sinking construction. During pile sinking construction, piles are mainly subject to pile end resistance and pile side friction resistance. Vibration pile sinking is essentially to overcome the pile end resistance through the impact force of the pile on the soil layer at the pile end during pile movement, and reduce the pile side friction resistance through vibration, thereby achieving the effect of pile sinking.

[0003] At present, the research on vibration pile driving technology in China is still not mature enough, and the research on the pile-forming mechanism of steel pipe piles and fine construction control technology still lags behind the actual engineering. In addition, given the complexity of vibration pile driving, the current experiments on the mechanism of vibration pile driving are generally conducted on-site in-situ tests, which require a lot of manpower, financial resources and material resources. Summary of the invention

[0004] To this end, the present invention provides a vibration pile driving simulation device to solve or at least alleviate the above problems.

[0005] According to one aspect of the present invention, there is provided a vibration pile driving simulation device, comprising: a pile body; an electric vibrator connected to the pile body and suitable for generating an exciting force and transmitting the exciting force to the pile body; and a soil container suitable for containing soil and suitable for vertically upward movement relative to the pile body, so as to simulate the pile driving process of the pile body under the action of the exciting force.

[0006] Optionally, the vibration pile driving simulation equipment according to the present invention further includes: a reaction frame suitable for fixing the electric vibrator; and a guide rail installed on the reaction frame; the soil container can be slidably installed on the guide rail and is suitable for moving vertically upward along the guide rail.

[0007] Optionally, in the vibration pile driving simulation equipment according to the present invention, the guide rail is a bearing guide rail, which includes: a guide rail body, which is fixedly connected to the reaction frame; and a ball bushing, which is slidably mounted on the guide rail body and fixedly connected to the soil container through a base so that the soil container moves relative to the guide rail body.

[0008] Optionally, in the vibration pile driving simulation device according to the present invention, the electric vibration exciter is fixedly connected to the reaction frame via a fixing seat.

[0009] Optionally, in the vibration pile driving simulation device according to the present invention, the electric vibration exciter includes a top rod, and the top rod is connected to the pile body.

[0010] Optionally, the vibration pile driving simulation device according to the present invention further includes: a piezoelectric force sensor, which is respectively connected to the top of the top rod and the top of the pile body and is suitable for collecting current signals related to the force of the pile body.

[0011] Optionally, in the vibration pile driving simulation device according to the present invention, the top rod is provided with a first threaded hole; the piezoelectric force sensor is provided with a second threaded hole; the first threaded hole and the second threaded hole are fixedly connected by a connecting rod.

[0012] Optionally, in the vibration pile driving simulation device according to the present invention, a third threaded hole is provided on the top of the pile body; and the bottom of the piezoelectric force sensor is fixedly connected to the third threaded hole.

[0013] Optionally, the vibration pile driving simulation equipment according to the present invention further includes: a plurality of pulleys installed on the reaction frame, and a steel wire rope is wound around the pulley; one end of the steel wire rope is connected to the soil container, and the other end of the steel wire rope is suitable for hanging a counterweight carrier so as to pull the soil container to move vertically upward relative to the guide rail.

[0014] Optionally, in the vibration pile driving simulation device according to the present invention, four pulleys are provided, and the four pulleys are evenly distributed on the reaction frame.

[0015] Optionally, in the vibration pile driving simulation device according to the present invention, the pile body is a steel pipe pile.

[0016] According to the technical solution of the present invention, a vibration pile driving simulation device is provided, which can accurately simulate the vibration pile driving process of a pile body under the action of an exciting force in reality. Specifically, the present invention installs both the electric vibrator and the steel pipe pile on the reaction frame to remain stationary by setting a reaction frame, and installs a guide rail on the reaction frame to slidably install the soil container on the guide rail, so that the soil can move vertically upward relative to the stationary pile body. In this way, the present invention avoids the movement of the electric vibrator and prevents the problem of structural instability caused by the large weight and volume of the electric vibrator. Therefore, the vibration pile driving simulation device of the present invention has a simple and stable structure and low cost. By means of the vibration pile driving simulation equipment of the present invention, vibration pile driving tests can be carried out on dry sand, wet sand and peat soil samples with different physical properties. According to the pile driving test, the influence of the relative density of sand, the degree of saturation of sand, the water content of peat soil, the excitation frequency and the excitation force on the driveability of steel pipe piles can be determined, thereby determining the best pile planting parameters (parameters include excitation frequency, excitation force, etc.) under different geological conditions, which is more conducive to guiding and optimizing the actual pile planting process.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To achieve the above and related purposes, certain illustrative aspects are described herein in conjunction with the following description and accompanying drawings, which indicate various ways in which the principles disclosed herein can be practiced, and all aspects and their equivalents are intended to fall within the scope of the claimed subject matter. The above and other purposes, features and advantages of the present disclosure will become more apparent by reading the following detailed description in conjunction with the accompanying drawings. Throughout the present disclosure, the same reference numerals generally refer to the same parts or elements.

[0019] Figure 1 A front structural schematic diagram of a vibration pile driving simulation device 200 according to an embodiment of the present invention is shown;

[0020] Figure 2 A schematic side structural diagram of a vibration pile driving simulation device 200 according to an embodiment of the present invention is shown;

[0021] Figure 3 A schematic diagram of the structure of a vibration pile driving simulation device 200 according to an embodiment of the present invention is shown in a top view. DETAILED DESCRIPTION

[0022] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0023] As mentioned above, the systems used for vibration pile driving tests in the prior art have more or less certain functional defects during use, so the present invention proposes a vibration pile driving simulation device 200 with more optimized performance. Figures 1 to 3 The schematic diagrams of the structure of the pile driving simulation device 200 according to one embodiment of the present invention are respectively shown.

[0024] like Figures 1 to 3As shown, the vibration pile driving simulation device 200 includes a reaction frame 250, a pile body 210 installed on the reaction frame 250, an electric vibrator 130, and a soil container 230. The electric vibrator 130 generates an exciting force when an alternating voltage is input. The soil for the test is contained in the soil container 230. The electric vibrator 130 is fixedly connected to the reaction frame 250 through a fixed seat 139 and is installed on the upper part of the reaction frame 250. The fixed seat 139 is, for example, a fixed square steel, but is not limited thereto. The electric vibrator 130 includes a top rod 131, and is connected to the top of the pile body 210 through the top rod 131. In this way, the exciting force generated by the electric vibrator 130 can be output through the top rod 131 and transmitted to the pile body 210.

[0025] The present invention simulates the pile sinking process of the pile body 210 under the action of the exciting force by the relative movement between the pile body 210 and the soil. The electric vibrator 130 and the pile body 210 are both fixed on the reaction frame 250 and are in a stationary state. The soil container 230 can move vertically upward relative to the pile body 210, which is equivalent to the pile body 210 moving vertically downward relative to the soil in the soil container 230 under the action of the exciting force, thereby simulating the pile sinking process of the pile body 210 under the action of the exciting force.

[0026] According to an embodiment, the pile body 210 is, for example, a steel pipe pile, so that the vibration pile driving simulation device 200 of the present invention can simulate the vibration pile driving process of the steel pipe pile in reality, but the present invention is not limited thereto.

[0027] It should be pointed out that the existing structures of vibrating pile drivers are: one is to suspend the electric vibrator, which will inevitably cause large shaking after the electric vibrator is started, and the stability is extremely poor; the other is to use a pile frame guide to simulate pile driving, which requires the installation of a guide rail for the electric vibrator to move up and down. Due to the large weight and volume of the electric vibrator, the required guide rail and test platform are large, which increases the economic cost of the test. The above-mentioned configuration of the invention can avoid the movement of the electric vibrator 130, which is not only simple and stable in structure, but also low in cost.

[0028] It should be noted that the electric vibrator 130 includes a top rod 131, a spring connected to the top rod 131, a driving coil, a core rod, a permanent magnet, and an iron core. When the driving coil of the electric vibrator 130 is connected to the alternating voltage amplified by the power amplifier 120, a stable magnetic field will be generated in the electric vibrator 130. Under the action of the magnetic field, the alternating voltage signal will generate a corresponding alternating force, which can drive the electric vibrator 130 to move. The alternating force is approximately equal to the exciting force transmitted through the top rod 131.

[0029] According to one embodiment, Figure 1 and Figure 2As shown, the vibration pile driving simulation device 200 further includes a guide rail 240 mounted on the reaction frame 250. The soil container 230 is slidably mounted on the guide rail 240 and moves vertically upward along the guide rail 240.

[0030] According to one embodiment, Figure 2 and Figure 3 As shown, the guide rail 240 is a bearing guide rail, which includes a guide rail body 245 fixed on the reaction frame 250, and a ball bushing 241. The guide rail body 245 can be fixedly connected to the reaction frame 250 through a support seat. The ball bushing 241 is slidably mounted on the guide rail body 245, so that it can move vertically along the guide rail body 245. The soil container 230 is fixedly connected to the ball bushing 241 through the base 234, so that it can move vertically relative to the guide rail body 245 with the ball bushing 241.

[0031] Further, as shown in Figure 1, the vibration pile driving simulation device 200 also includes a plurality of pulleys 260, which are respectively installed at appropriate positions on the reaction frame 250. A steel wire rope 263 is wound around the pulley 260, one end of the steel wire rope 263 is connected to the soil container 230, and the other end of the steel wire rope 263 is suitable for hanging a counterweight carrier. In this way, the counterweight carrier can pull the soil container 230 and the soil body to move vertically upward relative to the guide rail body 245 through the steel wire rope 263. Specifically, the counterweight carrier is, for example, a weight 265 with a certain gravity value.

[0032] Preferably, the vibration pile driving simulation device 200 includes four pulleys 260. Specifically, by welding an angle hook at four positions of the reaction frame 250, each angle hook is used to hang a pulley 260, so that the four pulleys 260 are respectively installed at corresponding positions on the reaction frame 250. In this way, a total of four steel wire ropes 263 for hanging counterweight carriers are connected to the soil container 230, wherein two steel wire ropes 263 for hanging counterweight carriers are distributed on both sides of the soil container 230, thereby ensuring that the soil container 230 is subjected to a stable and balanced upward pulling force.

[0033] It should be understood that when the vertical component of the force exerted by the counterweight carrier on the wire rope is greater than the total gravity of the soil container 230, the soil, the base 234, and the ball bushing 241, the soil container 230 is subjected to a vertical upward force (tension), so that the soil container 230 and the soil contained therein will move vertically upward along the guide rail body 245 under the action of the tension, and move until they gradually contact the pile end of the steel pipe pile 210 (that is, the bottom end of the steel pipe pile 210 shown in the figure), thereby simulating the static load F0 in an actual vibratory pile driver.

[0034] It should be noted that in the simulation test of vibration pile driving by the vibration pile driving simulation device 200 of the present invention, the steel pipe pile 210 is in a stationary state, and the soil body moves vertically upward relative to the steel pipe pile 210. If the moving soil body is used as a reference object and the force analysis is performed on the steel pipe pile 210, the steel pipe pile 210 moves vertically downward relative to the soil body during the pile driving simulation. In this way, the direction of the pile side friction resistance and pile end resistance of the steel pipe pile 210 is vertically upward, the direction of the exciting force of the electric vibrator 130 acting on the top of the steel pipe pile 210 is vertically downward, and the static load F0 simulated by the weight carrier weight 265 is correspondingly converted into the elastic force of the spring connected to the top rod 131 in the electric vibrator 130, and the direction of the elastic force is vertically downward. When the sum of the vertically downward exciting force and the spring elastic force is greater than the sum of the vertically upward pile side friction resistance and pile end resistance, the steel pipe pile 210 will gradually sink into the soil body under the combined force. It can be seen from this that the stress condition of the steel pipe pile 210 in the vibration pile driving simulation device 200 of the present invention is the same as the stress condition of the steel pipe pile in actual vibration pile driving.

[0035] According to one embodiment, the vibration pile driving simulation device 200 also includes a piezoelectric force sensor 310. The piezoelectric force sensor 310 is fixedly connected to the top rod 131 of the electric vibrator 130 and the top of the steel pipe pile 210, respectively, so that the current signal related to the force on the top of the steel pipe pile 210 can be collected. By collecting the current signal related to the force on the top of the steel pipe pile 210, it is convenient to monitor the force on the top of the steel pipe pile 210 during the vibration pile driving test. For example, by adding a charge amplifier and a dynamic signal test and analysis system, the input end of the charge amplifier is connected to the piezoelectric force sensor 310, and the output end of the charge amplifier is connected to the dynamic signal test and analysis system. Thereby, the current output by the piezoelectric force sensor 310 is amplified by the charge amplifier and then output to the dynamic signal test and analysis system, and the dynamic signal test and analysis system dynamically monitors the force on the top of the steel pipe pile 210 according to the amplified current signal.

[0036] According to one embodiment, a first threaded hole is provided on the top rod 131 of the electric vibrator 130, and a second threaded hole is provided on the top of the piezoelectric force sensor 310. By fixing the first threaded hole and the second threaded hole with an adapted connecting rod, the electric vibrator 130 and the piezoelectric force sensor 310 can be fixedly connected. In addition, a third threaded hole is provided on the top of the steel pipe pile 210. By fixing the bottom of the piezoelectric force sensor 310 with the third threaded hole, the piezoelectric force sensor 310 is fixedly connected to the top of the steel pipe pile 210. Through the above arrangement, the piezoelectric force sensor 310 is fixedly connected to the top rod 131 of the electric vibrator 130 and the top of the steel pipe pile 210, respectively, so that the current signal related to the force (excitation force) at the top of the steel pipe pile 210 can be collected.

[0037] A10. The vibration pile driving simulation equipment as described in A9, wherein there are four pulleys, which are evenly distributed on the reaction frame.

[0038] In the description of this specification, unless otherwise clearly specified and limited, the terms "connected", "fixed", etc. should be understood in a broad sense. In addition, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or unit referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, cannot be understood as limiting the present invention.

[0039] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

Claims

1. A vibration pile driving simulation device, comprising: pile body; An electric vibration exciter connected to the pile body and adapted to generate an exciting force and transmit the exciting force to the pile body; A soil container, suitable for containing soil and suitable for vertically moving upward relative to the pile body, so as to simulate the pile sinking process of the pile body under the action of the exciting force; A reaction frame, suitable for fixing the electric vibrator; A guide rail, mounted on the reaction frame; Four pulleys are evenly mounted on the reaction frame, a steel wire rope is wound around the pulley, one end of the steel wire rope is connected to the soil container, and the other end of the steel wire rope is suitable for hanging a counterweight carrier so as to pull the soil container to move vertically upward relative to the guide rail; The soil container is slidably mounted on the guide rail and is suitable for vertically moving upward along the guide rail.

2. The vibration pile driving simulation device according to claim 1, wherein: The guide rail is a bearing guide rail, which comprises: A guide rail body fixedly connected to the reaction frame; and The ball bushing is slidably mounted on the guide rail body and is fixedly connected to the soil container via a base so that the soil container can move relative to the guide rail body.

3. The vibration pile driving simulation device according to claim 1, wherein: The electric vibration exciter is fixedly connected to the reaction frame via a fixing seat.

4. The vibration pile driving simulation device according to any one of claims 1 to 3, wherein: The electric vibration exciter comprises a top rod, and the top rod is connected to the pile body.

5. The vibration pile driving simulation device according to claim 4, wherein: Also includes: The piezoelectric force sensor is connected to the top of the top rod and the top of the pile body respectively, and is suitable for collecting current signals related to the force of the pile body.

6. The vibration pile driving simulation device according to claim 5, wherein: The top rod is provided with a first threaded hole; The piezoelectric force sensor is provided with a second threaded hole; The first threaded hole and the second threaded hole are fixedly connected via a connecting rod.

7. The vibration pile driving simulation device according to claim 5, wherein: A third threaded hole is provided on the top of the pile body; The bottom of the piezoelectric force sensor is fixedly connected to the third threaded hole.

8. The vibration pile driving simulation device according to any one of claims 1 to 3, wherein: The pile body is a steel pipe pile.

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