A self-balancing bearing capacity load box overall waterproof performance detection and calibration device for pile foundation

Abstract

The present invention relates to a load box waterproof performance detection and calibration device, which belongs to the field of civil engineering. A pile foundation self-balancing bearing capacity load box overall waterproof performance detection and calibration device, the detection and calibration device includes a load plate device, an independent anti-column device and a dynamic water level test device; the load plate device includes a load plate and a sealing strip, the load plate serves as a support plate of the load box, and the sealing strip is used to prevent the load box from overflowing during the waterproof detection process; the independent anti-column device is installed and fixed on the load plate to provide support for the dynamic water level test device; the dynamic water level test device is used to record the changes in the liquid level in the load box. The present invention has the following advantages: 1. After the load box loading test is completed, the quality of grouting outside the cylinder can be ensured; 2. It meets the requirements for waterproof detection of Class I load boxes in the engineering construction standards of Jiangxi Province; 3. The waterproof performance of the product can be understood in time, thereby injecting effective slurry and improving the cross-sectional strength of the pile body.

Description

Technical Field

[0001] The invention relates to a load box waterproof performance detection and calibration device, belonging to the field of civil engineering. Background Art

[0002] Load boxes are divided into Class I and Class II according to the different requirements for the use of test piles and engineering piles. Class I load boxes should have the following performance: 1) provide thrust for pile bearing capacity testing; 2) after the pile bearing capacity test is completed, the conditions for grouting inside and outside the load box cylinder should be met. However, during the test of the self-balancing method for pile bearing capacity, it was found that after the self-balancing load box was buried, the grouting outside the cylinder would be affected by groundwater, and the strength of the injected slurry was difficult to reach the strength of the pile itself, resulting in a decrease in the strength of the pile body. Summary of the invention

[0003] The purpose of the present invention is to provide a self-balancing bearing capacity load box overall waterproof performance detection and calibration device for pile foundations. By using the device, the waterproof performance of the load box can be timely understood, so that groundwater cannot enter the load box, thereby injecting effective slurry to improve the cross-sectional strength of the pile body.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a self-balancing bearing capacity load box overall waterproof performance detection and calibration device for pile foundations, the detection and calibration device comprising a bearing plate device, an independent anti-column device and a dynamic water level testing device; the bearing plate device comprises a bearing plate and a sealing strip, the bearing plate serves as a support plate of the load box, and the sealing strip is used to prevent the load box from overflowing during the waterproof detection process; the independent anti-column device is installed and fixed on the bearing plate to provide support for the dynamic water level testing device; the dynamic water level testing device is used to record the changes in the liquid level in the load box.

[0005] Preferably, the independent anti-column device includes a pull rod, a seal and a flange plate. There are multiple pull rods, the top of which is fixed to the flange plate and the bottom is fixed to the bearing plate. The seal is used to seal the gap between the pull rod and the bearing plate. The flange plate is parallel to the bearing plate; the displacement sensor is fixed on the edge of the flange plate.

[0006] Preferably, the sealing member is a waterproof tube, which surrounds the pull rod inside, the bottom of the waterproof tube is fixed on the bearing plate, and the top of the waterproof tube is not lower than the height after the load box is opened.

[0007] Preferably, the dynamic water level testing device includes a displacement sensor and a buoy. The displacement sensor is fixed on the flange plate. The buoy is placed in a limit piece in the slurry guide hole of the load box and is located directly below the displacement sensor probe.

[0008] Preferably, the limiting member is a water level test tube for limiting the horizontal displacement of the buoy, the bottom of the water level test tube is fixed on the bearing plate, and the bottom is connected to the slurry guide hole of the load box.

[0009] Preferably, the bearing plate device further comprises an I-beam, which is installed and fixed at the lower part of the bearing plate to serve as a supporting column of the bearing plate.

[0010] Preferably, the sealing strip is fixed on the bearing plate according to the diameter size of the load box series specification.

[0011] Preferably, the sealing strip is an annular flexible water stop strip.

[0012] Furthermore, it also includes a load box resetting device, which includes a pressure plate and a jack. The pressure plate is placed on the upper panel of the load box. The shell of the jack is fixed to the flange plate. The outer diameter of its plunger is adapted to the through hole on the axis of the flange plate, and the axis of the plunger corresponds to the center of the pressure plate.

[0013] Working principle: After the mechanical property verification of the load box is completed, the load box is placed on the bearing plate, and the bottom of the load box is tightly pressed against the flexible water stop strip to prevent the liquid medium from flowing out. The load box is in an open state when loaded with liquid medium; water is injected into the slurry guide hole of the load box until the water surface is flush with the bottom of the upper panel, and the initial value of the dynamic water level test device of the displacement sensor is recorded. After waiting for the observation time, the terminal value of the dynamic water level test device of the displacement sensor is recorded, and the corresponding detection conclusion is obtained after calculation; after the detection is completed, the open load box is pressed back to its original position by a jack.

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

[0015] 1. After the load box loading test is completed, the quality of grouting outside the cylinder can be ensured;

[0016] 2. Comply with the requirements for waterproof testing of Class I load boxes in Jiangxi Province's engineering construction standards;

[0017] 3. The waterproof performance of the product can be understood in time, so that groundwater cannot enter the load box, thereby injecting effective slurry to improve the cross-sectional strength of the pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention;

[0019] Figure 2 is a top view of an embodiment of the present invention;

[0020] Figure 3 yes Figure 1 Schematic diagram of the laser dynamic water level test device;

[0021] Figure 4 This is a schematic diagram of the structure before waterproof testing of an embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the waterproof test in an embodiment of the present invention;

[0023] Figure 6 is a diagram of the use state of an embodiment of the present invention (including a load box and a load box resetting device);

[0024] Figure 7 is a top view of the embodiment of the present invention in use;

[0025] Figure 8 is a cross-sectional view of an embodiment of the present invention in use;

[0026] In the figure, 1- jack; 2- upper flange plate; 3- lower flange plate; 4- pull rod; 5- waterproof pipe; 6- hexagonal nut; 7- annular flexible water stop strip; 8- multi-ring transverse water stop bearing plate; 9- I-beam; 10- laser instrument; 11- buoy; 12- water level test tube; 13- upper panel; 14- piston; 15- cylinder body; 16, pressure plate. DETAILED DESCRIPTION

[0027] It should be noted that in the embodiments of the present invention, the connection can be that the two components are directly connected and fixed, or they can be connected through an intermediate piece, such as bolt connection, etc., and ordinary technicians in this field should understand it in accordance with the structure of the present invention. In addition, the directional words "upper", "lower", "center", etc. are all described according to the drawings and do not constitute a limitation of the present invention.

[0028] The following is combined with Figure 1-7 The present invention is further described in detail: A pile foundation self-balancing bearing capacity load box overall waterproof performance detection and calibration device is mainly composed of an independent anti-column device, a bearing plate device, and a laser dynamic water level testing device; the independent anti-column device serves as an installation column of the laser dynamic water level testing device, the bearing plate device serves as a support plate of the load box, and the laser dynamic water level testing device is used to test the liquid level in the slurry guide hole of the load box, thereby detecting the waterproof performance of the load box.

[0029] like Figure 1-2 As shown, the bearing plate device includes an annular flexible waterstop strip 7, a multi-ring transverse waterstop bearing plate 8 and an I-beam 9; the I-beam 9 is welded to the multi-ring transverse waterstop bearing plate 8 as a whole, and is distributed on the two opposite sides of the lower part of the multi-ring transverse waterstop bearing plate 8, serving as a supporting column of the multi-ring transverse waterstop bearing plate 8; the multi-ring transverse waterstop bearing plate 8 serves as a supporting plate for the load box, and the annular flexible waterstop strip 7 is fixed on the multi-ring transverse waterstop bearing plate 8 according to the diameter size of the load box series specifications, so as to prevent water overflow during the waterproof detection of the load box.

[0030] like Figure 1-2As shown, the independent anti-column device is composed of an upper flange plate 2, a lower flange plate 3, a tie rod 4, a hexagonal nut 6, and a waterproof pipe 5; the upper flange plate 2 is connected to the lower flange plate 3 and the multi-ring transverse water-stop bearing plate 8 as a whole through the tie rod 4; specifically: the positions of the through holes on the circumference of the upper flange plate 2 and the lower flange plate 3 correspond, the top of the tie rod 4 passes through the through holes on the lower flange plate 3 and the upper flange plate 2 in turn, and the upper flange plate 2 and the lower flange plate 3 are fixed to the upper part of the tie rod 4 through nuts, and the upper flange plate 2 and the lower flange plate 3 are separated by a certain distance from each other, the bottom of the tie rod 4 passes through the multi-ring transverse water-stop bearing plate 8, and is fixed to the multi-ring transverse water-stop bearing plate 8 through the hexagonal nut 6; the bottom of the waterproof pipe 5 is fixed on the multi-ring transverse water-stop bearing plate 8, and its top is equal to or higher than the height after the load box is opened, and the tie rod 4 is surrounded inside it to solve the problem of leakage of the device itself.

[0031] like Figure 1 , 3 As shown, the laser dynamic water level testing device consists of a laser instrument 10, a buoy 11, and a water level testing tube 12; the laser instrument 10 is installed between the upper flange plate 2 and the lower flange plate 3, with its probe facing downward, for recording the water level position; the buoy 11 is placed in the water level testing tube 12, and is located directly below the probe of the laser instrument 10; the bottom of the water level testing tube 12 is fixed on the multi-ring transverse water-stop bearing plate 8, and the bottom is connected to the slurry guide hole of the load box, and its inner diameter is slightly larger than the outer diameter of the buoy 11, thereby limiting the horizontal displacement of the buoy 11.

[0032] In order to press the upper panel 13 of the load box back to its original position after the load box waterproof test is completed, a load box reset device is provided. Figure 4-8 As shown, it includes a pressure plate 16 and a jack 1. The pressure plate 16 is inserted between the pull rods 4, and its end is placed on a pad placed on the upper panel 13 of the load box. The shell of the jack 1 is installed on the upper flange plate 2. The jack plunger is opposite to the through hole position of the axis of the upper flange plate 2 and the lower flange plate 3. When the load box needs to be reset, the jack is started, and the plunger passes through the axis of the upper flange plate 2 and the lower flange plate 3, and presses the pressure plate 16. The pressure plate 16 presses the upper panel 13 downward, so that the piston 14 in the load box moves downward in the cylinder 15 to achieve the reset of the load box.

[0033] When the mechanical property test of the load box is completed, the load box is placed on the multi-ring transverse water-stop bearing plate 8, and the bottom of the load box is tightly pressed against the annular flexible water-stop strip 7 to prevent the liquid medium from flowing out. The load box loaded with the liquid medium is in an open state; water is injected into the slurry guide hole of the load box until the water surface is flush with the bottom of the upper panel 13, and the initial value of the laser dynamic water level test device is recorded. After waiting for the observation time, the terminal value of the laser dynamic water level test device is recorded, and the corresponding test conclusion is obtained after calculation; after the waterproof performance test is completed, the open load box is pressed back to its original position by the jack 1.

[0034] The above embodiments are only preferred implementations of the present invention and do not constitute a limitation of the present invention. The load box is not limited to the load box structure shown in the above embodiments, but may also be other structures. When testing the waterproof performance of load boxes with other structures, the structure of the waterproof detection and calibration device can be adjusted accordingly. It should be understood by those skilled in the art that any extension, deformation, etc. made without departing from the principle of the present invention are within the protection scope of the present invention.

Claims

1. A pile foundation self-balancing bearing capacity load box overall waterproof performance detection and calibration device, characterized in that: The detection and calibration device includes a load-bearing plate device, an independent anti-post device and a dynamic water level test device; the load-bearing plate device includes a load-bearing plate and a sealing strip, the load-bearing plate serves as a support plate for the load box, and the sealing strip is fixed on the load-bearing plate according to the diameter of the load box series specifications, and is used to prevent the load box from overflowing during the waterproof detection process; the independent anti-post device is installed and fixed on the load-bearing plate to provide support for the dynamic water level test device, which includes a pull rod, a seal and upper and lower flange plates, the upper and lower flange plates are parallel to the load-bearing plate, the top of the pull rod passes through the upper and lower flange plates in turn, the upper and lower flange plates are spaced a certain distance apart, and the bottom of the pull rod is fixed on the load-bearing plate; the dynamic water level test device is used to record the changes in the liquid level in the load box; The dynamic water level testing device includes a laser instrument and a buoy. The laser instrument is fixed between the upper and lower flange plates. The buoy is placed in a water level testing tube in the slurry guiding hole of the load box and is located directly below the laser instrument probe. The bottom of the water level testing tube is fixed on the bearing plate and the bottom is connected to the slurry guiding hole of the load box.

2. The device for detecting and calibrating the overall waterproof performance of the self-balancing bearing capacity load box of the pile foundation according to claim 1 is characterized in that: There are multiple pull rods, the tops of which are fixed to the flange plate, and the bottoms of which are fixed to the bearing plate.

3. The device for detecting and calibrating the overall waterproof performance of the self-balancing bearing capacity load box of the pile foundation according to claim 1 is characterized in that: The sealing member is a waterproof tube, which surrounds the pull rod inside. The bottom of the waterproof tube is fixed on the bearing plate, and the top of the waterproof tube is not lower than the height of the load box after it is opened.

4. The device for detecting and calibrating the overall waterproof performance of the self-balancing bearing capacity load box of the pile foundation according to claim 1 is characterized in that: The bearing plate device also includes an I-beam, which is installed and fixed on the lower part of the bearing plate and serves as a supporting column of the bearing plate.

5. The device for detecting and calibrating the overall waterproof performance of the self-balancing bearing capacity load box of the pile foundation according to claim 1 is characterized in that: The sealing strip is an annular flexible water stop strip.

6. The device for detecting and calibrating the overall waterproof performance of the self-balancing bearing capacity load box of the pile foundation according to claim 2 is characterized in that: It also includes a load box resetting device, which includes a pressure plate and a jack. The pressure plate is placed on the upper panel of the load box. The shell of the jack is fixed to the upper flange plate. The outer diameter of the jack plunger is adapted to the through hole on the axis of the upper and lower flange plates, and the axis of the plunger corresponds to the center of the pressure plate.

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