Pile bearing capacity testing device

Abstract

The utility model discloses a pile bearing capacity testing device which comprises a jack and a control assembly, the control assembly comprises a hydraulic oil tank, a hydraulic pump and a pressure cylinder, the hydraulic oil tank is communicated with the input end of the hydraulic pump, and the output end of the hydraulic pump is communicated with a first switch valve and a second switch valve. The second switch valve is communicated with the pressure cylinder and the third switch valve, the first switch valve and the pressure cylinder are communicated with the fourth switch valve, the fourth switch valve is communicated with the hydraulic oil tank, the third switch valve is communicated with the adjustable throttle valve, the adjustable throttle valve is communicated with the oil pressure output interface, and the oil pressure output interface is communicated with the jack. The pressure cylinder is arranged for pressurization, so that the pressurization rate is controllable, hydraulic loading data of the jack are conveniently obtained, more accurate detection data are obtained, meanwhile, the adjustable throttling valve is matched for use, the purpose of controlling the oil flow speed can be achieved, the oil pressure can be controlled to be in a stable level, and the detection precision is improved. Therefore, the safety problem caused by overlarge oil pressure is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation testing, and particularly relates to a pile bearing capacity test device. Background Art

[0002] A deep foundation composed of a pile and a pile cap connecting the top of the pile, or a single-pile foundation connecting a column and a pile foundation, is simply called a pile foundation. If the entire pile body is buried in the soil and the bottom surface of the pile cap contacts the soil mass, it is called a low-capacity pile foundation; if the upper part of the pile exposes above the ground and the bottom of the pile cap is above the ground, it is called a high-capacity pile foundation. The pile foundation is a commonly used foundation form for buildings in soft soil areas. It effectively transfers the structural load of the building to the deep part of the foundation through the pile, thereby meeting the requirements of reasonable deformation and reasonable foundation settlement of the building.

[0003] In engineering construction, the static load test measurement method is mostly used to detect the bearing capacity of the pile foundation, that is, a jack is set between the heavy object and the pile foundation, and stones are continuously stacked above the pile foundation to increase the total weight of the heavy object, thereby generating a certain force on the pile foundation. For example, a pile foundation bearing capacity detection device disclosed in the prior art with the application number CN202322601574.1 includes: a groove with an opening downward is formed in the movable block; a downward pressing assembly is installed inside the movable block, and the downward pressing assembly is used to press down the pile foundation; a bearing assembly is slidably connected inside the movable block, and the bearing assembly is located between the downward pressing assembly and the pile foundation; an adjusting assembly is installed on the base to control the downward depth of the movable block so that the bearing assembly fits with the top of the pile foundation. By setting a bearing assembly between the pile foundation and the downward pressing assembly, the bearing assembly receives the impact force pressed down by the downward pressing assembly. When the bearing assembly is under pressure, the spring inside the bearing assembly contracts. According to the contraction amount of the spring, the bearing capacity of the pile foundation is detected, making the bearing capacity of the pile foundation more intuitive. By controlling the up and down movement of the movable block through the adjusting assembly, it is ensured that during the test, the top end of the pile foundation is located inside the groove and fits with the bearing assembly, avoiding the collision between the bearing assembly and the pile foundation during downward pressing and causing damage to the pile foundation.

[0004] However, there are problems in the prior art. The hydraulic loading of the jack used for detection is not precise enough, which may lead to inaccurate detection data for the pile foundation and there are also safety risks. Content of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a pile bearing capacity test device, which can ensure precise and controllable hydraulic loading of the jack, thereby making the detection data for the impact accurate enough, and at the same time reducing the safety risk.

[0006] The pile bearing capacity test device according to the first aspect embodiment of the present utility model includes a jack connected to a pile and a control assembly connected to the jack for controlling the oil pressure of the jack. The control assembly includes a hydraulic oil tank, a hydraulic pump, and a booster cylinder. The hydraulic oil tank is connected to the input end of the hydraulic pump. The output end of the hydraulic pump is connected to one end of a first switching valve and one end of a second switching valve through pipelines. The other end of the second switching valve is connected to the high-pressure port of the booster cylinder and one end of a third switching valve. The other end of the first switching valve and the low-pressure port of the booster cylinder are both connected to one end of a fourth switching valve. The other end of the fourth switching valve is connected to the hydraulic oil tank. The other end of the third switching valve is connected to one end of a fifth switching valve and one end of an adjustable throttle valve. The other end of the fifth switching valve is connected to one end of a metering valve. The other end of the metering valve is connected to the hydraulic oil tank. One end of the adjustable throttle valve is connected to an oil pressure output interface, and the oil pressure output interface is connected to the jack.

[0007] The pile bearing capacity test device according to the embodiment of the present utility model has at least the following beneficial effects: By setting a booster cylinder for boosting, the boosting rate can be controlled, so that it is convenient to obtain the hydraulic loading data of the jack, and more accurate detection data can be obtained. At the same time, when used in combination with an adjustable throttle valve, the purpose of controlling the oil flow rate can be achieved, and the oil pressure can be controlled at a stable level, thereby avoiding safety problems caused by excessive oil pressure.

[0008] According to some embodiments of the present utility model, the adjustable throttle valve includes a valve body and an adjustment mechanism connected inside the valve body. An oil inlet and an oil outlet located on the same straight line are formed on the valve body. The adjustment mechanism includes a rotating shaft rotatably connected inside the valve body and an orifice plate connected to the rotating shaft. A plurality of through holes are spaced on the orifice plate. The rotating shaft is located between the oil inlet and the oil outlet and is perpendicular to the connection line between the oil inlet and the oil outlet.

[0009] According to some embodiments of the present utility model, there are multiple orifice plates fixedly connected around the rotating shaft at equal intervals.

[0010] According to some embodiments of the present utility model, a baffle is further connected to the rotating shaft, and the baffle and the orifice plate are fixedly connected around the rotating shaft at equal intervals.

[0011] According to some embodiments of the present utility model, there are multiple adjustment mechanisms, which are sequentially spaced along the connection line between the oil inlet and the oil outlet.

[0012] According to some embodiments of the present utility model, the adjustment mechanism further includes a slider and a return spring. A plurality of chutes are correspondingly formed on the inner wall of the valve body. The slider is slidably connected to the chute, the rotating shaft is rotatably connected to the slider, one end of the return spring is fixedly connected to one side of the chute close to the oil outlet, and the other end of the return spring abuts against the slider.

[0013] According to some embodiments of the present utility model, the booster cylinder includes a first chamber and a second chamber that communicate with each other. A first piston and a second piston are respectively and sealingly movably connected in the first chamber and the second chamber. The first piston is connected to the second piston through a piston rod. The low-pressure port is opened on one side of the first chamber away from the second chamber, and the high-pressure port is opened on one side of the second chamber away from the first chamber.

[0014] According to some embodiments of the present utility model, an oil inlet / outlet is opened on one side of the first chamber close to the second chamber, and the oil inlet / outlet communicates with the high-pressure port.

[0015] According to some embodiments of the present utility model, the other end of the metering valve communicates with the hydraulic oil tank through an oil return filter.

[0016] According to some embodiments of the present utility model, the first switching valve, the second switching valve, the third switching valve, the fourth switching valve and the fifth switching valve are all electric valves.

[0017] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0019] Figure 1 is a schematic diagram of the pipeline structure of the control component of the pile bearing capacity test device according to the embodiment of the present utility model.

[0020] Figure 2 is a schematic diagram of the structure of the booster cylinder of the pile bearing capacity test device according to the embodiment of the present utility model.

[0021] Figure 3 is a schematic diagram of the structure of the adjustable throttle valve of the pile bearing capacity test device according to the embodiment of the present utility model.

[0022] Figure 4 is a schematic diagram of the structure of the adjustable throttle valve of the pile bearing capacity test device according to another embodiment of the present utility model.

[0023] 100, hydraulic oil tank; 200, hydraulic pump; 300, booster cylinder; 310, first chamber; 311, low-pressure port; 320, second chamber; 321, high-pressure port; 330, first piston; 340, second piston; 350, piston rod; 360, oil inlet and outlet; 411, first switching valve; 412, second switching valve; 413, third switching valve; 414, fourth switching valve; 415, fifth switching valve; 420, metering valve; 430, oil pressure output interface; 500, adjustable throttle valve; 510, valve body; 511, oil inlet; 512, oil outlet; 513, chute; 520, rotating shaft; 530, orifice plate; 531, through hole; 540, baffle plate; 550, slider; 560, return spring; 600, oil return filter. Detailed implementation manners

[0024] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0025] In the description of the present utility model, it should be understood that for the orientation description, such as up, down, front, back, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0026] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0027] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0028] Refer to Figure 1 , Figure 2 and Figure 3As shown in the figure, the pile bearing capacity test device according to an embodiment of the present invention includes a jack (not shown in the figure) connected to the pile and a control assembly connected to the jack for controlling the oil pressure of the jack. The control assembly includes a hydraulic oil tank 100, a hydraulic pump 200, and a booster cylinder 300. The hydraulic oil tank 100 is connected to the input end of the hydraulic pump 200. The output end of the hydraulic pump 200 is respectively connected to one end of a first switching valve 411 and one end of a second switching valve 412 through pipelines. The other end of the second switching valve 412 is respectively connected to the high-pressure port 321 of the booster cylinder 300 and one end of a third switching valve 413. The other end of the first switching valve 411 and the low-pressure port 311 of the booster cylinder 300 are both connected to one end of a fourth switching valve 414. The other end of the fourth switching valve 414 is connected to the hydraulic oil tank 100. The other end of the third switching valve 413 is respectively connected to one end of a fifth switching valve 415 and one end of an adjustable throttle valve 500. The other end of the fifth switching valve 415 is connected to one end of a metering valve 420. The other end of the metering valve 420 is connected to the hydraulic oil tank 100. One end of the adjustable throttle valve 500 is connected to an oil pressure output interface 430. The oil pressure output interface 430 is connected to the jack.

[0029] During actual use, by setting the booster cylinder 300 for pressurization, the pressurization rate can be controlled, so as to conveniently obtain the hydraulic loading data of the jack, and more accurate detection data can be obtained. At the same time, when used in combination with the adjustable throttle valve 500, the purpose of controlling the oil flow rate can be achieved, and the oil pressure can be controlled at a stable level, thereby avoiding safety problems caused by excessive oil pressure.

[0030] In some specific embodiments of the present invention, it may further have the following additional technical features: The adjustable throttle valve 500 includes a valve body 510 and an adjustment mechanism connected inside the valve body 510. An oil inlet 511 and an oil outlet 512 are provided on the valve body 510 on the same straight line. The adjustment mechanism includes a rotating shaft 520 rotatably connected inside the valve body 510 and an orifice plate 530 connected to the rotating shaft 520. A plurality of through holes 531 are arranged at intervals on the orifice plate 530. The rotating shaft 520 is located between the oil inlet 511 and the oil outlet 512 and is perpendicular to the connection line between the oil inlet 511 and the oil outlet 512. Specifically, the middle part of the orifice plate 530 is connected to the rotating shaft 520. Thus, when the orifice plate 530 is perpendicular to the connection line between the oil inlet 511 and the oil outlet 512, the area of the orifice plate 530 is at least 90%-98% of the inner cavity cross-sectional area of the valve body 510, and the remaining area part is the gap between the orifice plate 530 and the inner cavity of the valve body 510, so as to allow the orifice plate 530 not to contact the inner cavity of the valve body 510 during rotation and not generate interference.

[0031] With the above design, when the hydraulic oil under high pressure enters the valve body 510, it will impact the orifice plate 530 on the rotating shaft 520 and drive the orifice plate 530 to rotate. At this time, the gap between the orifice plate 530 and the inner cavity of the valve body 510 is the main flow channel for the oil flow. During the rotation of the orifice plate 530, the flow area of the oil flow will continuously change, thereby enabling the control of the oil flow rate and ensuring stable pressure.

[0032] Reference Figure 4 As shown, in some specific embodiments of the present invention, it may further have the following additional technical features: There are multiple orifice plates 530, which are fixedly connected around the rotating shaft 520 at uniform intervals.

[0033] With the above design, at this time, since there are multiple orifice plates 530, except for certain rotation angles where the gap between the multiple orifice plates 530 and the inner cavity of the valve body 510 in the cross-section is relatively large, for other rotation angles, basically, the through holes 531 on the orifice plate 530 become the main flow channels for the oil flow. At this time, rotating the orifice plate 530 can more precisely control the oil pressure, thereby ensuring stable pressure.

[0034] Reference Figure 4 As shown, in some specific embodiments of the present invention, it may further have the following additional technical features: A baffle 540 is also connected to the rotating shaft 520, and the baffle 540 and the orifice plate 530 are fixedly connected around the rotating shaft 520 at uniform intervals.

[0035] With the above design, it further reduces the situation where there are certain rotation angles such that the gap between the multiple orifice plates 530 and the inner cavity of the valve body 510 in the cross-section is relatively large, thereby further ensuring stable pressure.

[0036] Reference Figure 4 As shown, in some specific embodiments of the present invention, it may further have the following additional technical features: There are multiple adjustment mechanisms, which are sequentially arranged at intervals along the connection line between the oil inlet 511 and the oil outlet 512.

[0037] With the above design, the cooperation of multiple adjustment mechanisms can make the pressure control smoother and more stable.

[0038] Reference Figure 4 As shown, in some specific embodiments of the present invention, it may further have the following additional technical features: The adjustment mechanism further includes a slider 550 and a return spring 560. A plurality of sliding grooves 513 are correspondingly formed on the inner wall of the valve body 510. The slider 550 is slidably connected to the sliding grooves 513. The rotating shaft 520 is rotatably connected to the slider 550. One end of the return spring 560 is fixedly connected to the side of the sliding groove 513 close to the oil outlet 512, and the other end of the return spring 560 abuts against the slider 550.

[0039] Through the above design, when facing an oil flow with high pressure, the impact force of the oil flow on the rotating shaft 520 can be reduced by means of sliding displacement, thereby improving the overall durability. After the oil pressure weakens, the return spring 560 will drive the slider 550 to reset.

[0040] Specifically, during the production process, the valve body 510 is divided into two splicable half shells (not shown in the figure) by the connection line between the oil inlet 511 and the oil outlet 512. The chute 513 is respectively provided on the two half shells. Then, according to actual needs, the connection hole plate 530 or the baffle 540 is fixedly installed on the rotating shaft 520. After that, the sliders 550 are rotatably connected to both ends of the rotating shaft 520. First, the slider 550 at one end of the rotating shaft 520 is placed in the chute 513 of one of the half shells, and then the other half shell is spliced onto this half shell. During the splicing process, the slider 550 at the other end of the rotating shaft 520 is correspondingly connected to the chute 513 on the other shell. After the splicing is completed, the two shells are sealed to ensure that there is no leakage during use.

[0041] Reference Figure 2 As shown, in some specific embodiments of the present invention, it may further have the following additional technical features: The pressure intensifying cylinder 300 includes a first chamber 310 and a second chamber 320 that are interconnected. A first piston 330 and a second piston 340 are respectively and sealingly movably connected in the first chamber 310 and the second chamber 320. The first piston 330 is connected to the second piston 340 through a piston rod 350. The low-pressure port 311 is opened on the side of the first chamber 310 away from the second chamber 320, and the high-pressure port 321 is opened on the side of the second chamber 320 away from the first chamber 310.

[0042] In some specific embodiments of the present invention, it may further have the following additional technical features: An oil inlet / outlet 512360 is opened on the side of the first chamber 310 close to the second chamber 320, and the oil inlet / outlet 512 is communicated with the high-pressure port 321. Specifically, the oil inlet / outlet 512360 is located between the first piston 330 and the second piston 340. Through this design, in addition to enabling the first piston 330 and the second piston 340 to transmit force through the piston rod 350 during movement, the hydraulic oil entering between the first piston 330 and the second piston 340 from the oil inlet / outlet 512360 can also be used to transmit force, making the entire movement process smoother and more stable.

[0043] In some specific embodiments of the present invention, it may further have the following additional technical features: The other end of the metering valve 420 is communicated with the hydraulic oil tank 100 through an oil return filter 600.

[0044] In some specific embodiments of the present utility model, it may further have the following additional technical features: The first switching valve 411, the second switching valve 412, the third switching valve 413, the fourth switching valve 414, and the fifth switching valve 415 are all electric valves.

[0045] Specifically, the hydraulic pump 200, the metering valve 420, the oil return filter 600, and the electric valve are common technical solutions in the prior art. The corresponding models can be obtained by referring to reference books according to actual demand parameters and purchased on the market. Their specific structures and principles will not be elaborated here.

[0046] Working principle:

[0047] Opening process and pressure holding process of the jack: Turn on the hydraulic pump 200, and the hydraulic oil enters the entire pipeline. Close the first switching valve 411 and the fifth switching valve 415, and open the second switching valve 412 and the third switching valve 413. At this time, one path of hydraulic oil enters the booster cylinder 300, and the other path passes through the adjustable throttle valve 500 and then enters the jack through the oil pressure output interface 430. Starting from the following steps, close the second switching valve 412 and the fourth switching valve 414, and open the first switching valve 411 and the third switching valve 413. The hydraulic oil enters the booster cylinder 300 to pressurize the pipeline; close the first switching valve 411 and the third switching valve 413, and open the second switching valve 412 and the fourth switching valve 414. The hydraulic oil enters the booster cylinder 300 to reset, and the hydraulic oil in the first chamber 310 of the booster cylinder 300 is sent back to the hydraulic oil tank 100 through the pipeline of the fourth switching valve 414. This is one cycle. Repeat this process, and the pressurization rate is controllable. When the number of pressurization times reaches the preset number, the jacking distance of the jack also reaches the expected value. At this time, close the third switching valve 413 and the fifth switching valve 415 for pipeline pressure holding. The jack is in the open state, and testing can start at this time.

[0048] Closing process of the jack: When the jack is in the open state, open the metering valve 420 and set the hydraulic oil pressure relief flow rate. Open the fifth switching valve 415, and the control component quickly cancels the pressure acting on the jack, and the jack resets.

[0049] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which it pertains, various changes can be made without departing from the gist of the present utility model.

Claims

1. A pile bearing capacity test device, comprising a jack connected to a pile and a control assembly connected to the jack for controlling the oil pressure of the jack, characterized in that: The control component comprises a hydraulic oil tank (100), a hydraulic pump (200) and a booster cylinder (300); the hydraulic oil tank (100) is connected to an input end of the hydraulic pump (200); the output end of the hydraulic pump (200) is connected to one end of a first switch valve (411) and one end of a second switch valve (412) through a pipeline; the other end of the second switch valve (412) is connected to a high-pressure port (321) of the booster cylinder (300) and one end of a third switch valve (413); the other end of the first switch valve (411) and the low-pressure port (311) of the booster cylinder (300) are both The third switch valve (413) is connected to one end of the fourth switch valve (414), the other end of the fourth switch valve (414) is connected to the hydraulic oil tank (100), the other end of the third switch valve (413) is respectively connected to one end of the fifth switch valve (415) and one end of the adjustable flow valve (500), the other end of the fifth switch valve (415) is connected to one end of the metering valve (420), the other end of the metering valve (420) is connected to the hydraulic oil tank (100), one end of the adjustable flow valve (500) is connected to the oil pressure output interface (430), and the oil pressure output interface (430) is connected to the jack.

2. The pile bearing capacity test device according to claim 1, characterized in that: The adjustable flow valve (500) comprises a valve body (510) and an adjustment mechanism connected to the valve body (510); the valve body (510) is provided with an oil inlet (511) and an oil outlet (512) located on the same straight line; the adjustment mechanism comprises a rotating shaft (520) rotatably connected to the valve body (510) and an orifice plate (530) connected to the rotating shaft (520); a plurality of through holes (531) are arranged at intervals on the orifice plate (530); the rotating shaft (520) is located between the oil inlet (511) and the oil outlet (512) and is perpendicular to the line between the oil inlet (511) and the oil outlet (512).

3. The pile bearing capacity test device according to claim 2, characterized in that: The orifice plates (530) are multiple and evenly spaced and fixedly connected around the rotating shaft (520).

4. The pile bearing capacity test device according to claim 2, characterized in that: The rotating shaft (520) is also connected to a baffle (540), and the baffle (540) is evenly spaced and fixedly connected to the orifice plate (530) around the rotating shaft (520).

5. The pile bearing capacity test device according to any one of claims 2 to 4, characterized in that: There are a plurality of adjustment mechanisms, which are arranged in sequence and at intervals along a line connecting the oil inlet (511) and the oil outlet (512).

6. The pile bearing capacity test device according to claim 5, characterized in that: The adjustment mechanism also includes a slider (550) and a return spring (560). A plurality of slide grooves (513) are correspondingly opened on the inner wall of the valve body (510). The slider (550) is slidably connected to the slide groove (513). The rotating shaft (520) is rotationally connected to the slider (550). One end of the return spring (560) is fixedly connected to one side of the slide groove (513) close to the oil outlet (512), and the other end of the return spring (560) is in contact with the slider (550).

7. The pile bearing capacity test device according to claim 1, characterized in that: The booster cylinder (300) comprises a first chamber (310) and a second chamber (320) which are interconnected, wherein a first piston (330) and a second piston (340) are respectively sealed and movably connected in the first chamber (310) and the second chamber (320), wherein the first piston (330) is connected to the second piston (340) via a piston rod (350), wherein the low-pressure port (311) is provided on a side of the first chamber (310) away from the second chamber (320), and wherein the high-pressure port (321) is provided on a side of the second chamber (320) away from the first chamber (310).

8. The pile bearing capacity test device according to claim 7, characterized in that: An oil inlet and outlet (512) (360) is provided on a side of the first chamber (310) close to the second chamber (320), and the oil inlet and outlet (512) (360) is communicated with the high-pressure port (321).

9. The pile bearing capacity test device according to claim 1, characterized in that: The other end of the metering valve (420) is connected to the hydraulic oil tank (100) via an oil return filter (600).

10. The pile bearing capacity test device according to claim 1, characterized in that: The first switch valve (411), the second switch valve (412), the third switch valve (413), the fourth switch valve (414) and the fifth switch valve (415) are all electric valves.

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