A building construction foundation quality detection device

Abstract

The application discloses a kind of building construction ground quality detection devices, belong to detection device technical field, including support, sleeve is slidably arranged on support, counterweight is fixedly arranged on the outside of sleeve, support is fixedly arranged with the limiting ring matched with sleeve;Wherein, the ratio of the diameter of limiting ring and the inside diameter of sleeve is 1.2-1.3, so the sleeve that moves down along support will be limited by limiting ring;Detection mechanism for detecting the state of support is provided on support;Whether support is in vertical state can be detected by adjusting mechanism, ensure that support is in vertical state during detection process;Through the mutual cooperation of ball, lubricating oil, sponge, exhaust groove and air supply mechanism, when lubricating oil is discharged, under the action of sponge, lubricating oil can be evenly covered on the surface of support, when counterweight moves down, the resistance that counterweight receives is reduced, when counterweight impacts limiting ring, impact force is transmitted to support by limiting ring, improve detection accuracy.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of detection devices, in particular to a building construction foundation quality detection device. BACKGROUND

[0002] In the process of a standard penetration test, a detection personnel first lifts a drop hammer assembly along a measuring rod to a preset scale position, and then releases a counterweight hammer to freely fall along a guide rod. By controlling the drop distance, kinetic energy conversion is achieved, and the impact kinetic energy of the hammer body is used to drive the measuring rod to penetrate into the foundation soil layer. After repeated impact, the final penetration depth is measured, and the number of hammer blows is combined to comprehensively evaluate the dynamic bearing characteristics of the foundation soil. Through the corresponding relationship between energy transmission and soil deformation, the compactness and mechanical response parameters of the foundation soil layer can be effectively obtained.

[0003] However, in the prior art, the counterweight hammer has a significant shaking problem during free falling. This shaking can cause unintended contact between the counterweight hammer and the side wall of the support, resulting in a large frictional resistance. This frictional resistance significantly consumes the falling kinetic energy of the counterweight hammer, which in turn adversely affects the accuracy of the detection results. Especially in high-precision detection situations, the kinetic energy loss caused by friction can significantly increase the detection error, seriously affecting the measurement accuracy and reliability of the detection equipment.

[0004] Therefore, a building construction foundation quality detection device is provided. SUMMARY

[0005] In view of the problems in the prior art, the purpose of the present application is to provide a building construction foundation quality detection device that can reduce the error caused by wear between the counterweight hammer and the side wall of the support during falling.

[0006] To solve the above problems, the application adopts the following technical solutions.

[0007] A building construction foundation quality detection device, comprising a support, a sleeve slidingly arranged on the support, a counterweight hammer fixedly arranged outside the sleeve, and a limiting ring fixedly arranged on the support and cooperating with the sleeve;

[0008] The support is provided with a detection mechanism for detecting the state of the support;

[0009] Uniform mounting holes are formed in the inner side wall of the sleeve, and rolling balls are movably embedded in the mounting holes. A baffle is fixedly arranged on the support and located above the sleeve. A liquid storage cavity is formed in the support, and lubricating oil is filled in the liquid storage cavity. Uniform pressure relief valves with output ends communicating with the outside are embedded in the side wall of the liquid storage cavity, and a pressurizing mechanism is arranged on the support for pressurizing the liquid storage cavity;

[0010] The sleeve is provided with an annular cavity below the mounting hole, and an annular exhaust groove is formed on the side wall of the annular cavity close to the support. The exhaust groove is inclined upward, and the limiting ring is provided with a gas supply mechanism for supplying gas to the annular cavity.

[0011] Further, the support is provided with an annular flow guide cavity, and the output end of the pressure relief valve extends into the flow guide cavity. Uniformly distributed oil discharge holes are formed in the side wall of the flow guide cavity and communicate with the outside. A circular sponge is arranged on the side wall of the support.

[0012] Further, the top end and the bottom end of the sleeve are respectively provided with an upper corrugated pipe and a lower corrugated pipe. The upper corrugated pipe and the lower corrugated pipe are arranged outside the support. The top end of the upper corrugated pipe is fixedly connected to the bottom wall of the baffle. An annular groove is formed in the top wall of the limiting ring. The bottom end of the lower corrugated pipe is fixedly connected to the bottom wall of the annular groove.

[0013] Further, the pressurizing mechanism includes a pressurizing cavity formed in the upper corrugated pipe. A guide pipe extending into the liquid storage cavity is fixedly inserted into the side wall of the pressurizing cavity. The guide pipe is located above the pressure relief valve. Lubricating oil is filled in the pressurizing cavity and the guide pipe. The support is provided with a backflow mechanism for returning the lubricating oil to the liquid storage cavity.

[0014] Further, the gas supply mechanism includes a cavity formed in the lower corrugated pipe. A gas pipe extending into the annular cavity is inserted into the side wall of the cavity.

[0015] Further, the backflow mechanism includes a one-way valve fixedly embedded in the bottom wall of the liquid storage cavity. The output end of the one-way valve communicates with the liquid storage cavity. A circulation pipe is fixedly inserted into the side wall of the annular groove. The end of the circulation pipe away from the annular groove communicates with the input end of the one-way valve.

[0016] Further, the detection mechanism includes a mounting plate horizontally fixedly installed at the top end of the support. A connecting rope is fixedly installed on the bottom wall of the mounting plate. A plumb bob is fixedly installed at the bottom end of the connecting rope.

[0017] Further, a circular ring-shaped floating block is slidably installed in the liquid storage cavity. A friction plate is fixedly sleeved on the side wall of the floating block.

[0018] Further, a circular ring groove is formed in the bottom wall of the baffle. An air bag is fixedly installed in the circular ring groove. The bottom wall of the air bag is located outside the circular ring groove.

[0019] A plug hole penetrating through the baffle is formed in the top wall of the circular ring groove. The output end of the air bag extends into the plug hole. A scale is vertically slidably inserted into the plug hole. The output end of the air bag is fixedly connected to the side wall of the plug hole. Markings are provided on the side wall of the scale.

[0020] Further, the upper corrugated pipe and the lower corrugated pipe are made of rubber material.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] (1) This solution uses the cooperation of ball bearings, lubricating oil, sponge, exhaust groove and air supply mechanism. When the lubricating oil is discharged, the lubricating oil can be evenly covered on the surface of the support under the action of the sponge. When the counterweight moves down, the resistance of the counterweight is reduced. When the counterweight hits the limit ring, the impact force is transmitted to the support through the limit ring, which improves the detection accuracy.

[0023] (2) This solution uses the cooperation of the upper corrugated pipe, the lower corrugated pipe and the annular groove to prevent the lubricating oil from leaking when the lubricating oil is applied to the surface of the bracket, thus saving costs. At the same time, under the action of the annular groove, the sleeve and the counterweight can directly contact the limiting ring, so that the counterweight can transmit the impact force to the limiting ring, further improving the detection accuracy.

[0024] (3) In this scheme, through the cooperation of the one-way valve and the circulation pipe, the lubricating oil on the surface of the support flows downward along the side wall of the support under the action of gravity and finally flows into the annular groove. When the sleeve moves down, the upper bellows is stretched. At this time, the pressurization chamber is in a negative pressure state. Under the action of the conduit, the liquid storage chamber is also in a negative pressure environment. At this time, the liquid storage chamber absorbs lubricating oil from the annular groove through the one-way valve and the circulation pipe, so that the lubricating oil can flow back to the liquid storage chamber, which plays a role in saving costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a front cross-sectional view of the present invention;

[0027] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A;

[0028] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B;

[0029] Figure 5 For the present invention Figure 2 Enlarged structural diagram at point C;

[0030] Figure 6 This is a top view of the structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the combined structure of the float and friction plate of the present invention.

[0032] Explanation of the labels in the diagram:

[0033] 1, support; 2, sleeve; 3, counterweight; 4, limiting ring; 5, ball; 6, baffle; 7, liquid storage cavity; 8, pressure relief valve; 9, annular cavity; 10, exhaust groove; 11, flow guide cavity; 12, oil drain hole; 13, sponge; 14, upper corrugated tube; 15, lower corrugated tube; 16, annular groove; 17, pressurizing cavity; 18, catheter; 19, cavity; 20, air pipe; 21, one-way valve; 22, circulation pipe; 23, mounting plate; 24, connecting rope; 25, plumb bob; 26, float; 27, friction plate; 28, circular ring groove; 29, air bag; 30, jack; 31, scale; 32, mark. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0035] Please refer to Figures 1 to 7 A building construction foundation quality detection device, comprising a support 1, a sleeve 2 is slidably arranged on the support 1, a counterweight 3 is fixedly arranged outside the sleeve 2, and a limiting ring 4 matched with the sleeve 2 is fixedly arranged on the support 1; wherein the ratio of the diameter of the limiting ring 4 to the inner diameter of the sleeve 2 is 1.2-1.3, so that the sleeve 2 moving downward along the support 1 will be limited by the limiting ring 4;

[0036] A detection mechanism for detecting the state of the support 1 is arranged on the support 1; the detection mechanism can detect whether the support 1 is in a vertical state, so as to ensure that the support 1 is in a vertical state during detection;

[0037] Mounting holes are uniformly arranged on the inner side wall of the sleeve 2, balls 5 are movably arranged in the mounting holes, there is a gap between the sleeve 2 and the support 1 when the balls 5 are arranged, a baffle 6 is fixedly arranged on the support 1 and located above the sleeve 2, so that the baffle 6 and the limiting ring 4 can limit the movement range of the sleeve 2, a liquid storage cavity 7 is arranged on the support 1 and filled with lubricating oil, pressure relief valves 8 with output ends communicating with the outside are uniformly arranged on the side wall of the liquid storage cavity 7, and a pressurizing mechanism for pressurizing the liquid storage cavity 7 is arranged on the support 1;

[0038] When detection is needed, first place the support 1 at the detection site, so that the support 1 is in a vertical state, and an operator holds the support 1, so that the support 1 can move in the vertical direction.

[0039] Then the counterweight 3 is pushed upward by other workers, in the process, the pressurizing mechanism provides high pressure gas for the liquid storage cavity 7, at this time, the air pressure in the liquid storage cavity 7 increases, so that the pressure relief valve 8 opens.

[0040] When the pressure relief valve 8 opens, the lubricating oil in the liquid storage cavity 7 is discharged to the outside through the pressure relief valve 8, and the discharged lubricating oil flows downward along the surface of the support 1;

[0041] When the counterweight 3 moves to the specified height, the counterweight 3 is loosened, and under the action of its own gravity, the counterweight 3 moves downward along the support 1;

[0042] The sleeve 2 is provided with an annular cavity 9 below the mounting hole, and the annular cavity 9 is provided with an annular exhaust groove 10 on the side wall close to the support 1, the exhaust groove 10 is inclined upward, and the limiting ring 4 is provided with a gas supply mechanism for supplying gas to the annular cavity 9;

[0043] In the process of moving the sleeve 2 downward along the support 1, the gas supply mechanism supplies gas to the annular cavity 9, and the gas in the annular cavity 9 is discharged upward through the exhaust groove 10, at this time, the gas discharged from the exhaust groove 10 flows upward and impacts the lubricating oil on the surface of the support 1, slowing down the speed of the lubricating oil flowing downward, thereby ensuring that the contact part of the ball 5 and the support 1 contains an oil film, reducing the friction between the ball 5 and the support 1, and reducing the kinetic energy loss of the counterweight 3.

[0044] When the counterweight 3 hits the limiting ring 4, the impact force is transmitted to the support 1 through the limiting ring 4, at this time, the support 1 moves downward and inserts into the ground, and thus reciprocating, the foundation quality can be obtained by observing the depth of the support 1 inserted into the ground.

[0045] As shown in Figure 2 , Figure 3 , the support 1 is provided with an annular flow guide cavity 11, and the output end of the pressure relief valve 8 extends into the flow guide cavity 11, so that the lubricating oil discharged from the pressure relief valve 8 enters the flow guide cavity 11, the side wall of the flow guide cavity 11 is uniformly provided with oil discharge holes 12 communicating with the outside, and the oil discharge holes 12 are uniformly circumferentially distributed on the side wall of the support 1, so that the lubricating oil in the flow guide cavity 11 is discharged through the oil discharge holes 12 and uniformly flows downward along the side wall of the support 1, thereby achieving the effect of uniformly smearing the lubricating oil on the surface of the support 1, and the sponge 13 is sleeved on the side wall of the support 1, and the sponge 13 covers the outside of the oil discharge hole 12, so that the lubricating oil flowing out of the oil discharge hole 12 wets the sponge 13, and then uniformly discharges to the surface of the support 1 through the bottom wall of the sponge 13, thereby achieving the effect of uniformly smearing the lubricating oil on the surface of the support 1.

[0046] As shown in Figure 2As shown, the top end and the bottom end of the sleeve 2 are respectively provided with the upper bellows 14 and the lower bellows 15, the upper bellows 14 and the lower bellows 15 are sleeved on the outside of the support 1, the top end of the upper bellows 14 is fixedly connected with the bottom wall of the baffle 6, the top wall of the limiting ring 4 is provided with the annular groove 16, the bottom end of the lower bellows 15 is fixedly connected with the bottom wall of the annular groove 16, so when the counterweight 3 drives the sleeve 2 to impact the limiting ring 4, the lower bellows 15 will be completely retracted into the annular groove 16, which ensures that the counterweight 3 can normally impact the limiting ring 4.

[0047] Under the action of the upper bellows 14 and the lower bellows 15, the discharged lubricating oil in the liquid storage cavity 7 can be prevented from leaking to the outside, which plays a role in saving cost and protecting the environment.

[0048] As shown in the figure, Figure 5 The pressurizing mechanism includes the pressurizing cavity 17 provided on the upper bellows 14, the side wall of the pressurizing cavity 17 is fixedly provided with the conduit 18 extending into the liquid storage cavity 7, the conduit 18 is located above the pressure relief valve 8, and the pressurizing cavity 17 and the conduit 18 are both filled with lubricating oil, during the process of the sleeve 2 moving downward along the support 1, the upper bellows 14 is stretched, at this time, the pressurizing cavity 17 absorbs the lubricating oil from the liquid storage cavity 7 through the conduit 18; when the sleeve 2 moves upward along the support 1, the upper bellows 14 is extruded, at this time, the lubricating oil in the pressurizing cavity 17 is discharged into the liquid storage cavity 7 through the conduit 18, so that the pressure in the liquid storage cavity 7 is increased, which plays a role in pressurizing the liquid storage cavity 7, and the support 1 is provided with a backflow mechanism for making the lubricating oil flow back to the liquid storage cavity 7.

[0049] As shown in the figure, Figure 4 The gas supply mechanism includes the cavity 19 provided on the lower bellows 15, the side wall of the cavity 19 is provided with the gas pipe 20 extending into the annular cavity 9; when the sleeve 2 moves downward, the lower bellows 15 is extruded, at this time, the gas in the cavity 19 is discharged into the annular cavity 9 through the gas pipe 20, which plays a role in supplying gas for the annular cavity 9.

[0050] When the sleeve 2 moves upward, the lower bellows 15 is stretched, at this time, the cavity 19 inhales air from the space between the sleeve 2 and the side wall of the support 1 through the gas pipe 20, which plays a role in preparing for the next work.

[0051] As shown in the figure, Figure 2 The backflow mechanism includes the one-way valve 21 fixedly embedded on the bottom wall of the liquid storage cavity 7, the output end of the one-way valve 21 is communicated with the liquid storage cavity 7, the side wall of the annular groove 16 is fixedly provided with the circulation pipe 22, the end of the circulation pipe 22 away from the annular groove 16 penetrates the limiting ring 4 and the support 1 and is communicated with the input end of the one-way valve 21.

[0052] The lubricating oil on the surface of the support 1 flows downward along the side wall of the support 1 under the action of gravity, and finally flows into the annular groove 16.

[0053] When the sleeve 2 moves downward, the upper corrugated tube 14 is stretched, at this time, the pressurized cavity 17 is in a negative pressure state, under the action of the conduit 18, the liquid storage cavity 7 is also in a negative pressure environment, at this time, the liquid storage cavity 7 absorbs lubricating oil from the annular groove 16 through the one-way valve 21 and the circulation pipe 22, so that the lubricating oil can flow back to the liquid storage cavity 7, and prepares for the next work.

[0054] As shown in Figure 1 , the detection mechanism comprises a mounting plate 23 fixedly installed horizontally at the top end of the support 1, a connecting rope 24 fixedly installed on the bottom wall of the mounting plate 23, a conical plumb 25 fixedly installed at the bottom end of the connecting rope 24, and the tip of the plumb 25 is downward, and the connecting rope 24 is fixedly connected with the top wall of the plumb 25.

[0055] The connecting rope 24 is directed to the center of the earth by the gravity of the plumb 25, forming an absolutely vertical reference line, after the connecting rope 24 is stationary, the parallelism between the support 1 and the connecting rope 24 is observed, if the support 1 is completely parallel to the connecting rope 24, it indicates that the support 1 is in a vertical state, thereby reducing the probability of the sleeve 2 driving the ball 5 to press the support 1 during the downward movement of the sleeve 2, reducing the loss of kinetic energy of the sleeve 2, and improving the detection accuracy.

[0056] As shown in Figure 2 , Figure 7 , a circular ring-shaped float 26 is slidingly installed in the liquid storage cavity 7, and a friction plate 27 is fixedly sleeved on the side wall of the float 26, when the liquid storage cavity 7 discharges lubricating oil outward through the pressure relief valve 8, the height of the float 26 changes with the change of the liquid level, the float 26 drives the friction plate 27 to move on the surface of the liquid storage cavity 7, so that heat is generated between the friction plate 27 and the side wall of the liquid storage cavity 7 due to friction, and the heat is transferred to the lubricating oil, thereby improving the flowability of the lubricating oil, and ensuring that the lubricating oil can flow downward along the surface of the support 1 in time.

[0057] As shown in Figure 5 , a circular groove 28 is formed in the bottom wall of the baffle 6, and an air bag 29 is fixedly installed in the circular groove 28, and the bottom wall of the air bag 29 is located outside the circular groove 28.

[0058] The top wall of the circular groove 28 is provided with a through hole 30 penetrating the baffle 6, the output end of the air bag 29 extends into the through hole 30, a scale 31 is vertically slidably inserted into the through hole 30, and the output end of the air bag 29 is fixedly connected with the side wall of the through hole 30, so that the scale 31 is prevented from falling into the air bag 29 by the output end of the air bag 29, the side wall of the scale 31 is provided with a mark 32, when the top wall of the counterweight 3 is completely attached to the bottom wall of the baffle 6, the air bag 29 is squeezed, at this time, the gas in the air bag 29 is discharged into the through hole 30, so that the scale 31 extends out of the through hole 30, when the mark 32 is located on the top wall of the baffle 6, it can be determined that the counterweight 3 is in a horizontal state; if the mark 32 is not extended out of the through hole 30, it indicates that there is a gap between the top wall of the counterweight 3 and the baffle 6, that is, the counterweight 3 may not be in a horizontal state, therefore, through the cooperation of the air bag 29 and the mark 32 on the scale 31, it can be ensured that the top wall of the counterweight 3 is in a horizontal state when the counterweight 3 is released.

[0059] As shown in Figure 1 The upper bellows 14 and the lower bellows 15 are both made of rubber material, which is not easy to crack under repeated deformation, thereby reducing the damage probability of the upper bellows 14 and the lower bellows 15.

[0060] Method for use: when detection is needed, first place the support 1 at the detection site, so that the support 1 is in a vertical state, and the staff holds the support 1, so that the support 1 can move in the vertical direction.

[0061] Then the other staff pushes the counterweight 3 upwards, in this process, the pressurizing mechanism provides high-pressure gas for the liquid storage cavity 7, at this time, the air pressure in the liquid storage cavity 7 increases, so that the pressure relief valve 8 is opened.

[0062] When the pressure relief valve 8 is opened, the lubricating oil in the liquid storage cavity 7 is discharged to the outside through the pressure relief valve 8, and the discharged lubricating oil flows downward along the surface of the support 1;

[0063] When the counterweight 3 moves to the specified height, the counterweight 3 is released, and under the action of its own gravity, the counterweight 3 moves downward along the support 1;

[0064] The sleeve 2 is provided with an annular cavity 9 below the mounting hole, the side wall of the annular cavity 9 close to the side of the support 1 is provided with an annular exhaust groove 10 which is inclined upward, and the limiting ring 4 is provided with a gas supply mechanism for supplying gas to the annular cavity 9;

[0065] During the process of the sleeve 2 moving down along the support 1, the gas supply mechanism supplies gas to the annular cavity 9, and the gas in the annular cavity 9 is discharged upward through the exhaust groove 10, at this time, the gas discharged from the exhaust groove 10 flows upward and impacts the lubricating oil on the surface of the support 1 upward, which slows down the downward flow speed of the lubricating oil, thereby ensuring that the contact position of the ball 5 and the support 1 contains an oil film, which reduces the friction between the ball 5 and the support 1, and reduces the kinetic energy loss of the weight 3.

[0066] When the weight 3 impacts the limiting ring 4, the impact force is transmitted to the support 1 through the limiting ring 4, at this time, the support 1 moves downward and inserts into the ground, and thus reciprocates, so that the foundation quality can be obtained by observing the depth of the support 1 inserted into the ground.

[0067] The above merely describes the preferred embodiments of the present application; however, the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical range disclosed in the present application according to the technical scheme and the improvement concept of the present application, which should be covered in the protection scope of the present application.

Claims

1. A building foundation quality testing device, comprising a support (1), a sleeve (2) slidably sleeved on the support (1), a counterweight (3) fixedly sleeved on the outside of the sleeve (2), and a limiting ring (4) that cooperates with the sleeve (2) fixedly sleeved on the support (1). Its features are: The bracket (1) is provided with a detection mechanism for detecting the status of the bracket (1); The inner wall of the sleeve (2) is provided with mounting holes evenly, and a ball bearing (5) is movably embedded in the mounting hole. A baffle (6) is fixedly sleeved on the bracket (1). The baffle (6) is located above the sleeve (2). A liquid storage chamber (7) is provided on the bracket (1). The liquid storage chamber (7) is filled with lubricating oil. A pressure relief valve (8) with an output end communicating with the outside is evenly embedded on the side wall of the liquid storage chamber (7). A pressure-pressurizing mechanism for pressurizing the liquid storage chamber (7) is provided on the bracket (1). The sleeve (2) has an annular cavity (9) located below the mounting hole. The annular cavity (9) has an annular exhaust groove (10) on the side wall of the annular cavity (9) near the bracket (1). The exhaust groove (10) is inclined upward, and the limiting ring (4) has an air supply mechanism for supplying air to the annular cavity (9). The top and bottom ends of the sleeve (2) are respectively equipped with an upper corrugated pipe (14) and a lower corrugated pipe (15). The upper corrugated pipe (14) and the lower corrugated pipe (15) are both sleeved on the outside of the bracket (1). The top end of the upper corrugated pipe (14) is fixedly connected to the bottom wall of the baffle (6). An annular groove (16) is opened on the top wall of the limiting ring (4). The bottom end of the lower corrugated pipe (15) is fixedly connected to the bottom wall of the annular groove (16). The pressurizing mechanism includes a pressurizing chamber (17) opened on the upper bellows (14), and a conduit (18) extending into the liquid storage chamber (7) is fixedly inserted on the side wall of the pressurizing chamber (17). The conduit (18) is located above the pressure relief valve (8), and both the pressurizing chamber (17) and the conduit (18) are filled with lubricating oil. The support (1) is provided with a return mechanism that allows the lubricating oil to flow back to the liquid storage chamber (7).

2. The building foundation quality testing device according to claim 1, characterized in that: The bracket (1) has an annular flow guide cavity (11), the output end of the pressure relief valve (8) extends into the flow guide cavity (11), and the side wall of the flow guide cavity (11) is evenly provided with oil drain holes (12) communicating with the outside. The oil drain holes (12) are evenly distributed circumferentially on the side wall of the bracket (1), and the side wall of the bracket (1) is fitted with an annular sponge (13), and the sponge (13) covers the outside of the oil drain holes (12).

3. The building foundation quality testing device according to claim 2, characterized in that: The gas supply mechanism includes a cavity (19) opened on the lower corrugated pipe (15), and a gas pipe (20) extending into the annular cavity (9) is inserted on the side wall of the cavity (19).

4. The building foundation quality testing device according to claim 3, characterized in that: The reflux mechanism includes a one-way valve (21) fixedly embedded in the bottom wall of the liquid storage chamber (7). The output end of the one-way valve (21) is connected to the liquid storage chamber (7). A circulation pipe (22) is fixedly inserted into the side wall of the annular groove (16). The end of the circulation pipe (22) away from the annular groove (16) is connected to the input end of the one-way valve (21).

5. The building foundation quality testing device according to claim 4, characterized in that: The testing mechanism includes a mounting plate (23) that is horizontally fixedly installed on the top of the bracket (1). A connecting rope (24) is fixedly installed on the bottom wall of the mounting plate (23), and a plumb bob (25) is fixedly installed at the bottom end of the connecting rope (24).

6. The foundation quality testing device for building construction according to claim 5, characterized in that: A circular float (26) is slidably installed in the liquid storage chamber (7), and a friction plate (27) is fixedly sleeved on the side wall of the float (26).

7. The foundation quality testing device for building construction according to claim 6, characterized in that: A circular groove (28) is provided on the bottom wall of the baffle (6), and an airbag (29) is fixedly installed in the circular groove (28). The bottom wall of the airbag (29) is located outside the circular groove (28). The top wall of the annular groove (28) is provided with a through hole (30) for the baffle (6). The output end of the airbag (29) extends into the through hole (30). A scale (31) is vertically slidably inserted into the through hole (30), and the output end of the airbag (29) is fixedly connected to the side wall of the through hole (30). A mark (32) is provided on the side wall of the scale (31).

8. The foundation quality testing device for building construction according to claim 7, characterized in that: Both the upper corrugated pipe (14) and the lower corrugated pipe (15) are made of rubber material.

Images