A device for testing pore water pressure in experimental concrete specimens

Abstract

This invention belongs to the field of water pressure testing technology, and particularly relates to a device for testing the pore water pressure of concrete specimens in experiments. The invention places the concrete specimen in a pressure water tank, and a pressurized water pump supplies water to the tank, filling the specimen with water. A pore water pressure gauge is then embedded in pre-designed pores within the concrete specimen. The gauge is connected to an operating platform via a cable. The platform is located at the top of a lifting mechanism, and an instrument display is fixedly connected to the top of the platform for convenient data recording during operation. A rotating shaft inside the platform controls the cable's length by extending and retracting it. The lifting mechanism is adjustable to a suitable height, eliminating the need to constantly bend over to view and record data, effectively improving operational convenience.

Description

Technical Field

[0001] This utility model belongs to the field of water pressure testing technology, specifically relating to a device for testing pore water pressure in experimental concrete specimens. Background Technology

[0002] During the casting and molding process, concrete materials develop numerous initial defects such as microscopic cracks and pores. Concrete structures situated in aquatic environments, such as bridge piers and abutments of cross-sea or cross-river bridges, offshore oil platforms, and dams, are subjected to high-pressure water. This high-pressure water gradually seeps into the concrete pores, generating pore water pressure. This pore water pressure then promotes the propagation and connection of initial cracks and pores, leading to new microcracks and even macroscopic defects, thus affecting the overall mechanical properties of the concrete structure. Therefore, using a pore water pressure gauge to measure the pore water pressure or osmotic pressure inside a structure allows for effective monitoring of concrete structures.

[0003] However, existing pore water pressure gauges are generally installed by drilling or embedding in soil layers, and there is currently no device specifically designed to test the pore water pressure of concrete specimens. Nevertheless, for concrete structures in aquatic environments, pore water pressure affects their mechanical properties. Therefore, it is essential to design a device capable of testing the pore water pressure of concrete specimens to better analyze the mechanical properties of concrete structures in aquatic environments. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention presents a device for testing pore water pressure in experimental concrete specimens, providing a simple and convenient way to monitor the pore water pressure in concrete structures.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An experimental concrete specimen pore water pressure testing device, comprising:

[0007] The booster pump is connected to the pressure tank via a water pipe to fill and pressurize the pressure tank with water.

[0008] A pressurized water tank is used to hold concrete specimens, simulating the concrete specimens being in a water environment;

[0009] A pore water pressure gauge is embedded in the pores of a concrete specimen to test the pore water pressure of the concrete specimen in a water environment. The pore water pressure gauge is connected to the operating table via a cable.

[0010] The control panel has an instrument display at the top and a lifting mechanism at the bottom, with the bottom of the lifting mechanism connected to a tripod.

[0011] Preferably, the pore water pressure gauge device includes a pore water pressure gauge body, a protective tube is installed over the pore water pressure gauge body, the bottom end of the protective tube is connected to the penetration head, a waterproof layer is provided on the upper end of the pore water pressure gauge body, and a cable passes through the waterproof layer and connects to the operating table.

[0012] Preferably, the lifting mechanism includes a sliding rod and a fixed rod. The top of the sliding rod is connected to the bottom of the operating table, and the bottom of the fixed rod is connected to the base. The sliding rod can slide up and down along the inner wall of the fixed rod. A through hole is provided on the upper side wall of the fixed rod, and the sliding rod is provided with the same through holes at intervals along the axial direction. The locking rod passes through the through holes and fixes the sliding rod and the fixed rod.

[0013] Preferably, the bottom of the base is connected to a rotating connector, and the rotating connector is hinged to a triangular fixing bracket via a rotating shaft.

[0014] Preferably, the operating table has a horizontally arranged rotating shaft inside, with both ends of the rotating shaft rotatably connected to fixed blocks on the inner wall of the operating table. The rotating shaft has a winding groove and a limiting plate located on both sides of the winding groove. The cable enters from one side of the operating table and is wound around the winding groove. The end of the cable is connected to the instrument display. The other side of the operating table has a rotatable handle for adjusting the rotating shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Fixing the instrument display to the operating table makes data recording more stable. The lifting mechanism can be adjusted to a suitable height, making it convenient to adjust during experiments and very easy to operate, effectively solving the problem of ease of operation.

[0017] 2. The waterproof layer of the pressure gauge can prevent external water from directly contacting the pores of the concrete, simulating the real pressure state of concrete in a water environment, which can improve the accuracy of the experiment.

[0018] 3. Currently, most pore water pressure gauges on the market are used to test the pore water pressure of the ground. This utility model ingeniously combines a pore water pressure gauge with a pressure tank, allowing the pore water pressure gauge to be used in experiments. It is also simple to operate and has applicability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the pore water pressure gauge device of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the operating table and the base in this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the operating table in this utility model.

[0023] In the diagram: 1. Pressurized water pump; 2. Pressure tank; 3. Pore water pressure gauge device; 31. Pore water pressure gauge body; 32. Protective pipe; 33. Penetration head; 4. Waterproof layer; 5. Cable; 6. Lifting mechanism; 61. Sliding rod; 62. Fixing rod; 63. Locking rod; 7. Base; 71. Rotary connector; 72. Triangular fixing bracket; 8. Operating table; 81. Winding groove; 82. Rotating shaft; 83. Fixing block; 84. Limiting plate; 85. Rotatable handle; 9. Instrument display. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example

[0026] See Figure 1 An experimental concrete specimen pore water pressure testing device, comprising:

[0027] The pressurizing water pump 1 is connected to the pressure water tank 2 through a water pipe to fill and pressurize the pressure water tank 2 with water.

[0028] Pressure tank 2 is used to place concrete specimens and simulate the concrete specimens being in a water environment;

[0029] The pore water pressure gauge device 3 is embedded in the pores of the concrete specimen and is used to test the pore water pressure of the concrete specimen in a water environment. The pore water pressure gauge device 3 is connected to the operating table 8 via the cable 5.

[0030] The control panel 8 has an instrument display 9 connected to the top and a lifting mechanism 6 connected to the bottom. The bottom of the lifting mechanism 6 is connected to a tripod 7.

[0031] See Figure 2The pore water pressure gauge device 3 includes a pore water pressure gauge body 31, with a protective tube 32 surrounding the body. The bottom end of the protective tube 32 is connected to a penetration head 33. The protective tube 32 protects the pore water pressure gauge from direct contact with water and mud. The penetration head 33 is used to penetrate into the drilled hole, protecting the pore water pressure gauge body 31. A waterproof layer 4 is also provided at the upper end of the pore water pressure gauge body 31 to prevent water seepage in the aquatic environment. Furthermore, the waterproof layer 4, as shown in the figure, is platform-shaped, into which the top of the pore water pressure gauge body 31 is inserted. A cable 5 passes through the waterproof layer 4 and connects to the operating platform 8. In this embodiment, the pore water pressure gauge body 31 uses a SCYG318 miniature pore water pressure gauge manufactured by Wuxi Sainno Measurement & Control Technology Co., Ltd. During use, the platform-shaped waterproof layer 4 facilitates manual lifting and placement of the pore water pressure gauge body 31 into the protective tube 32.

[0032] See Figure 3 The lifting mechanism 6 includes a sliding rod 61 and a fixed rod 62. The top of the sliding rod 61 is connected to the bottom of the operating table 8, and the bottom of the fixed rod 62 is connected to the base 7. The sliding rod 61 can slide up and down along the inner wall of the fixed rod 62. A through hole is provided on the upper side wall of the fixed rod 62, and the sliding rod 61 has the same through holes spaced apart along the axial direction. The locking rod 63 passes through the through holes and fixes the sliding rod 61 and the fixed rod 62. In this embodiment, through holes can be provided at 10cm intervals on the side wall of the sliding rod 61. The through holes of the sliding rod 61 and the fixed rod 62 are aligned according to the height to be adjusted, and then the locking rod 63 is inserted accordingly. The end of the locking rod 63 can be threaded, and then further tightened with a nut. Alternatively, the through holes on the sliding rod 61 and the fixed rod 62 can be replaced with threaded holes, and the locking rod 63 can be a threaded rod, which is locked by rotation.

[0033] See Figure 3 The bottom of the base 7 is connected to a rotating connector 71, which is hinged to a triangular fixing bracket 72 via a pivot. The device can be fixed by the triangular fixing bracket 72, and the angle of the triangular fixing bracket 72 can be adjusted horizontally by 90 degrees. The overall balance of the device can be maintained by adjusting the angle of the triangular fixing bracket 72.

[0034] See Figure 4 The operating console 8 has a horizontally arranged rotating shaft 82 inside. The two ends of the rotating shaft 82 are rotatably connected to the fixed blocks 83 on the inner wall of the operating console 8. The rotating shaft 82 has a winding groove 81 and a limiting plate 84. The limiting plate 84 is located on both sides of the winding groove 81. The cable 5 enters from one side of the operating console 8 and is wound on the winding groove 81. The end of the cable 5 is connected to the instrument display 9. The other side of the operating console 8 has a rotatable handle 85 for adjusting the rotating shaft 82.

[0035] The working principle and usage process of this utility model are as follows: A pressurized water pump 1 pressurizes the water tank 2, placing the concrete specimen in a water-filled environment. Holes are pre-drilled in the concrete specimen. The pore water pressure gauge body 31 is then inserted into the protective tube 32. The assembled pore water pressure gauge device 3 is then inserted into the concrete specimen through the penetration head 33. With the triple protection of the protective tube 32, the penetration head 33, and the waterproof layer 4, the pore water pressure gauge body 31 can operate stably. The test result, i.e., the concrete pore water pressure value, is transmitted via the cable 5 and displayed on the instrument display 9 for convenient data recording. Shaking the rotatable handle 85 rotates the rotating shaft 82, which in turn retracts and extends the cable 5 wound on the winding shaft 81, allowing for length adjustment of the cable 5 to suit actual usage needs. When the height of the operating platform 8 needs adjustment, the height can be easily adjusted through the cooperation of the sliding rod 61 and the fixed rod 62 holes, as well as the connection of the locking rod 63. Alternatively, other existing lifting structures can be selected to achieve the lifting of the operating platform 8. The appropriate height eliminates the need to constantly bend over to view and record data, effectively improving ease of operation. The base 7 is also adjustable as needed, maintaining the stability of the entire device.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An experimental concrete test specimen pore water pressure testing device, characterized by, include: A pressurized water pump (1) is connected to a pressure tank (2) via a water pipe to fill and pressurize the pressure tank (2); Pressure tank (2) is used to place concrete specimens to simulate the concrete specimens being in a water environment; A pore water pressure gauge device (3) is embedded in the pores of a concrete specimen to test the pore water pressure of the concrete specimen in a water environment. The pore water pressure gauge device (3) is connected to the operating table (8) via a cable (5). The control panel (8) is connected to an instrument display (9) at the top and to a lifting mechanism (6) at the bottom. The bottom of the lifting mechanism (6) is connected to a base (7).

2. The experimental concrete specimen pore water pressure testing device according to claim 1, characterized in that, The pore water pressure gauge device (3) includes a pore water pressure gauge body (31), a protective tube (32) is installed on the pore water pressure gauge body (31), the bottom end of the protective tube (32) is connected to the penetration head (33), a waterproof layer (4) is provided on the upper end of the pore water pressure gauge body (31), and a cable (5) passes through the waterproof layer (4) and connects to the operating table (8).

3. The experimental concrete specimen pore water pressure testing device according to claim 1, characterized in that, The lifting mechanism (6) includes a sliding rod (61) and a fixed rod (62). The top of the sliding rod (61) is connected to the bottom of the operating table (8), and the bottom of the fixed rod (62) is connected to the base (7). The sliding rod (61) can slide up and down along the inner wall of the fixed rod (62). A through hole is provided on the upper side wall of the fixed rod (62), and the sliding rod (61) is provided with the same through holes at intervals along the axial direction. The locking rod (63) passes through the through holes and fixes the sliding rod (61) and the fixed rod (62).

4. A device for testing pore water pressure in experimental concrete specimens according to claim 1 or 3, characterized in that, The bottom of the base (7) is connected to a rotating connector (71), and the rotating connector (71) is hinged to a triangular fixing bracket (72) via a rotating shaft.

5. The experimental concrete specimen pore water pressure testing device according to claim 1, characterized in that, The operating table (8) is provided with a rotating shaft (82) inside. The two ends of the rotating shaft (82) are rotatably connected to the fixing blocks (83) on the inner wall of the operating table (8). A winding groove (81) is provided on the rotating shaft (82). A limiting plate (84) is also provided on the rotating shaft (82). The limiting plate (84) is located on both sides of the winding groove (81). The cable (5) enters from one side of the operating table (8) and is wound on the winding groove (81). The end of the cable (5) is connected to the instrument display (9). A rotatable handle (85) for adjusting the rotating shaft (82) is provided on the other side of the operating table (8).

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