A displacement testing device utilizing changes in liquid level

Abstract

The present invention relates to a displacement testing device that utilizes the change in liquid level elevation, and belongs to the field of civil engineering. A displacement testing device that utilizes the change in liquid level elevation includes a vertical pipe, a U-shaped sleeve, an elevation cavity, and a height change monitoring structure; the vertical pipe includes a vertical pipe A and a vertical pipe B, both of which are fixed to the upper pile and arranged along the length direction of the pile; the U-shaped sleeve is used to connect the vertical pipe A and the vertical pipe B, which is fixed to the lower pile, and its two ends are respectively plugged into the bottom ends of the vertical pipe A and the vertical pipe B, and the length of the plug-in part is greater than the displacement height of the load box; the elevation cavity is connected to the vertical pipe A and the vertical pipe B through a horizontal pipe; the height change monitoring structure is used to monitor the change in liquid level in the elevation cavity, thereby obtaining the displacement change value of the load box. The present invention has the following advantages: 1. It can accurately collect displacement data with high reliability; 2. The vertical pipe is inside the U-shaped sleeve, which can prevent liquid outside the sleeve from seeping into the sleeve, while ensuring that the vertical pipe can move freely up and down.

Description

Technical Field

[0001] The invention relates to a displacement testing device utilizing the change in liquid level elevation, and belongs to the field of civil engineering. Background Art

[0002] Self-balancing tests involving displacement testing devices, such as displacement rods and displacement wires, cannot be installed vertically, so their testing accuracy often lacks the reliability to accurately collect displacement data, seriously affecting the accuracy of pile static load self-balancing tests. Summary of the Invention

[0003] The purpose of the present invention is to provide a displacement testing device which can accurately collect displacement data and utilize the change of liquid level elevation.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a displacement testing device using the change of liquid level elevation, comprising a vertical pipe, a U-shaped sleeve, an elevation cavity and a height change monitoring structure; the vertical pipe comprises a vertical pipe A and a vertical pipe B, both of which are fixed to the upper pile and arranged along the length direction of the pile; the U-shaped sleeve is used to connect the vertical pipe A and the vertical pipe B, which is fixed to the lower pile, and its two ends are respectively plugged into the bottom ends of the vertical pipe A and the vertical pipe B, and the length of the plug-in part is greater than the displacement height of the load box; the elevation cavity is connected to the vertical pipe A and the vertical pipe B through a horizontal pipe; the height change monitoring structure is used to monitor the change of liquid height in the elevation cavity, thereby obtaining the displacement change value of the load box.

[0005] Preferably, the vertical pipe A serves as the liquid inlet pipe, and its top end is higher than or flush with the top end of the elevation cavity; the top end of the vertical pipe B is connected to the elevation cavity through the horizontal pipe.

[0006] Preferably, the vertical pipe A serves as the liquid inlet pipe, and a stop valve is installed on the horizontal pipe between the liquid inlet pipe and the elevation chamber. When liquid is injected, the stop valve is used to prevent the liquid from passing through the horizontal pipe into other pipes.

[0007] Preferably, the height change monitoring structure includes a displacement sensor and a light target. The displacement sensor is mounted on the reference beam and is located directly above the elevation cavity; the light target is placed on the liquid level in the elevation cavity.

[0008] Preferably, vertical pipes A and vertical pipes B are symmetrically distributed.

[0009] Preferably, vertical pipe A and vertical pipe B are arranged at the position where the load box cylinder and the piston form displacement.

[0010] Preferably, the vertical pipe A, the vertical pipe B, the U-shaped sleeve and the elevation cavity are all geometric bodies with regular inner diameters.

[0011] Preferably, the number of vertical pipes is at least two.

[0012] Preferably, the elevation cavity also serves as an exhaust pipe.

[0013] Design principle: According to Pascal's law, liquid is incompressible at normal temperature and pressure. The shape of the liquid changes with the shape of the container cavity without being affected by the container. What is particularly important is that under the influence of gravity, the horizontal elevation of the liquid always maintains the same elevation.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. Able to accurately collect displacement data with high reliability;

[0016] 2. The vertical pipe is inside the U-shaped casing, which can prevent the liquid outside the casing from seeping into the casing, while ensuring that the vertical pipe can move up and down freely. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of an embodiment of the present invention (before liquid injection);

[0019] Figure 3 This is a state diagram of an embodiment of the present invention ((1) is after liquid injection, (2) is after load box test displacement);

[0020] Figure 1-3 Among them, 1. test cavity; 2. vertical pipe; 3. U-shaped casing; 4. stop valve; 5. reference beam; 6. laser displacement sensor; 7. test target; 8. upper pile; 9. lower pile. DETAILED DESCRIPTION

[0021] It should be noted that the terms "horizontal", "upper", "lower", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0022] The following is combined with Figure 1-3 The present invention is further described in detail: a displacement testing device using the change in liquid level elevation comprises a plurality of vertical pipes 2, a U-shaped sleeve 3, a test cavity 1 (elevation cavity) and a height change monitoring structure; the vertical pipes 2 are fixed to the upper pile 8 and are arranged along the length direction of the pile at the position where the load box cylinder and the piston form displacement; the U-shaped sleeve 3 is used to connect the plurality of vertical pipes 2, which is fixed to the lower pile 9; the bottom ends of the plurality of vertical pipes 2 are inserted into the U-shaped sleeve 3, and the length of the plug-in part is greater than the displacement height of the load box; the test cavity 1 is connected to the plurality of vertical pipes 2 via a horizontal pipe; the height change monitoring structure is used to monitor the change in liquid level in the test cavity 1, thereby obtaining the displacement change value of the load box.

[0023] like Figure 1 As shown, in this embodiment, there are four vertical tubes 2, symmetrically arranged in pairs. One of the vertical tubes serves as the liquid inlet, with its top flush with the top of the test chamber 1. In this embodiment, the horizontal tubes are arranged in a cross configuration, with the test chamber 1 located at the center of the horizontal tube cross. The symmetrical vertical tubes are connected to the horizontal tubes. During liquid injection, to prevent liquid from flowing through the horizontal tube into other tubes (rather than through the U-shaped sleeve below), which could lead to gas in the vertical tube, a shut-off valve 4 is installed on the horizontal tube between the liquid inlet and the test chamber 1.

[0024] like Figure 2-3 As shown, in this embodiment, the height change monitoring structure includes a laser displacement sensor 6 and a test target 7 (light target). The laser displacement sensor 6 is installed below the reference beam 5 and directly above the test cavity 1. The test target 7 is placed on the liquid level in the test cavity 1. Figure 2 As shown, before injection, the vertical tube 2 is inserted into the U-shaped sleeve 3, and its plug-in end is sealed with a seal to prevent the liquid outside the U-shaped sleeve from seeping into the sleeve, while ensuring that the vertical tube 2 can move freely up and down in the U-shaped sleeve 3; Figure 3 As shown, after the liquid is injected, the vertical tube 2, the U-shaped sleeve 3, and the test cavity 1 are filled with liquid. At the same time, the liquid in the test cavity 1 is at the same height as the liquid level in the vertical tube 2 (liquid inlet pipe); Figure 3 As shown, after the load box is tested for displacement, that is, after the cylinder and piston of the load box move relative to each other, the U-shaped sleeve 3 moves downward, causing the internal space between the vertical pipe 2 and the U-shaped sleeve 3 to increase. As a result, the vertical pipe 2, the U-shaped sleeve 3, and the liquid in the test chamber 1 undergo displacement changes. When the liquid level test target 7 changes with the elevation, the laser displacement sensor 6 can accurately measure its elevation change.

[0025] As a preferred embodiment of this embodiment, the standpipe 2, U-shaped sleeve 3, and test chamber 1 are all geometric shapes with regular inner diameters, such as cylinders in this embodiment. The test chamber also serves as an exhaust pipe, ensuring that the displacement test device effectively exhausts internal gas when liquid is injected, ensuring that both the U-shaped sleeve 3 and standpipe 2 contain liquid.

[0026] Design principle: According to Pascal's law, liquid is incompressible at normal temperature and pressure. The shape of the liquid changes with the shape of the container cavity without being affected by the container. What is particularly important is that under the influence of gravity, the horizontal elevation of the liquid always maintains the same elevation.

[0027] like Figure 2-3 The specific design principles are as follows:

[0028] (1) The volume change of the liquid in the test chamber 1 is:

[0029]

[0030] (2) Assume that there are n vertical pipes in the load box, and the volume change of the liquid in vertical pipe 2 is:

[0031]

[0032] The total volume change of the liquid in the vertical tube is:

[0033]

[0034] (3) The volume change of the liquid in the test chamber 1 is equal to the total volume change of the liquid in the vertical tube 2

[0035]

[0036] so,

[0037] (4) The average value of the change in liquid height in the vertical pipe is

[0038]

[0039] That is, the displacement change of the upper and lower piles of the load box.

[0040] The above embodiments are merely preferred embodiments of the present invention and do not constitute limitations thereto. The height change monitoring structure in the embodiments may also employ other structures. For example, the test chamber may be made of a transparent material, with scale lines provided on the walls of the test chamber, and the liquid elevation change may be determined by reading the scale line values. Any extensions, modifications, equivalent substitutions, etc. made by persons of ordinary skill in the art without departing from the principles of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. A displacement testing device utilizing changes in liquid level, characterized in that: It includes a vertical pipe, a U-shaped sleeve, an elevation cavity and a height change monitoring structure; the vertical pipe includes a vertical pipe A and a vertical pipe B, both of which are fixed to the upper pile and arranged along the length direction of the pile; the U-shaped sleeve is used to connect the vertical pipe A and the vertical pipe B, which is fixed to the lower pile, and its two ends are respectively plugged into the bottom ends of the vertical pipe A and the vertical pipe B, and the length of the plug-in part is greater than the displacement height of the load box; the elevation cavity is connected with the vertical pipe A and the vertical pipe B through a horizontal pipe; the height change monitoring structure is used to monitor the height change of the liquid in the elevation cavity, so as to obtain the displacement change value of the load box; the vertical pipe A serves as a liquid inlet pipe, and its top end is higher than or flush with the top end of the elevation cavity; the top end of the vertical pipe B is connected to the elevation cavity through a horizontal pipe; after liquid injection, the vertical pipe, the U-shaped sleeve and the elevation cavity are filled with liquid, and at the same time, the liquid in the elevation cavity is at the same height as the liquid level in the liquid inlet pipe; The vertical pipe A serves as the liquid inlet pipe. A stop valve is installed on the horizontal pipe between the liquid inlet pipe and the elevation chamber. When liquid is injected, the stop valve is used to prevent the liquid from flowing into other pipes through the horizontal pipe. The height change monitoring structure includes a laser displacement sensor and a light target. The laser displacement sensor is installed on the reference beam and is located directly above the height cavity; the light target is placed on the liquid level in the height cavity.

2. The displacement testing device using liquid level change according to claim 1, characterized in that: Vertical pipes A and B are symmetrically distributed.

3. The displacement testing device using liquid level change according to claim 1, characterized in that: Vertical pipe A and vertical pipe B are arranged at the position where the load box cylinder and the piston form displacement.

4. The displacement testing device using liquid level change according to claim 1, characterized in that: The vertical pipe A, vertical pipe B, U-shaped casing and elevation cavity are all geometric bodies with regular inner diameters.

5. The displacement testing device using liquid level change according to claim 1, characterized in that: The number of vertical pipes is at least two.

6. The displacement testing device using liquid level change according to claim 1, characterized in that: The elevation cavity also serves as an exhaust pipe.

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