Deep hole water pressure test system

Abstract

The utility model provides a deep hole water pressure test system, comprising a water delivery device comprising a water tank, a flow meter and a pressurizing water pump which are connected in sequence; the pressurizing water pipe is connected with a water outlet of the pressurizing water pump; the two high-pressure water plugging rubber air bags are communicated with each other through a communicating pipeline; the lower end of the pressurizing water pipe penetrates through the middle of the upper high-pressure water plugging rubber air bag, and the tail end of the pressurizing water pipe is connected with the top of the lower high-pressure water plugging rubber air bag. The pressurizing water pipe section located between the two high-pressure water plugging rubber air bags is a water-permeable water pipe, water-permeable holes are formed in the water-permeable water pipe, and the bottom of the water-permeable water pipe is closed. The pressure charging and discharging device comprises an air pump, a pressure gauge and an air charging pipeline, the two ends of the air charging pipeline are communicated with the air pump and the high-pressure water plugging rubber air bag located on the upper portion respectively, and the pressure gauge is arranged on the air charging pipeline. The device is simple and convenient to operate, time-saving, labor-saving and high in test success rate, and can solve the problems that a test instrument is heavy, complex to operate, time-consuming and labor-consuming in the prior art.

Description

Technical Field

[0001] The utility model relates to the field of permeability detection, and particularly relates to a deep-hole water pressure test system.

Background Art

[0002] As an effective waterproof structure, cut-off walls have been widely used in many fields, such as various underground structures in water conservancy and hydropower projects, construction projects, and environmental projects, including subway tunnels, building foundations, landfills, dam sluices and other foundations. Cut-off walls are applicable to almost all geological conditions, such as bedrock, sandy soil layers, soft permeable layers, etc. Cut-off walls can effectively block the seepage of groundwater, greatly reduce the seepage volume, and ensure the safety of the project foundation. Permeability is one of the important indicators for evaluating cut-off walls, which determines their quality. The water pressure test is a kind of permeability test carried out in a borehole. It is a test in which a plug isolates a certain length of hole section in the borehole, and then water is pressed into this hole section at a certain pressure, and the injected flow rate under the corresponding pressure is measured. The water injection flow rate value per unit test section length under a certain pressure is used to characterize the permeability of this hole section, which is a common method for evaluating permeability. However, traditional air pressure or water pressure plugs are connected by steel pipes, which are divided into steel pipe structures with each section being 1 - 3 meters long and connected by screw threads. Therefore, when the water pressure borehole exceeds 20m, traditional test instruments will become very bulky, require a lot of labor, are complex to operate, time-consuming and laborious, with low test efficiency, bringing great inconvenience to on-site detection. At the same time, the overweight test instruments fixed around the hole opening will also cause unnecessary damage to the hole wall, resulting in the impact on test accuracy.

Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a deep-hole water pressure test system, which is simple to operate, time-saving and labor-saving, and at the same time has a high test success rate, and can solve the problems of bulky test instruments, complex operation, time-consuming and laborious existing in the prior art.

[0004] The utility model is realized as follows:

[0005] A deep-hole water pressure test system includes:

[0006] A water delivery device, including a water tank, a flow meter and a pressurizing water pump, which are connected in sequence;

[0007] A pressurized water pipe, which is connected to the water outlet of the pressurizing water pump;

[0008] Two high-pressure water plugging rubber air bags are interconnected through a connecting pipe; the lower end of the pressurized water pipe passes through the middle of the upper high-pressure water plugging rubber air bag and is connected to the top of the lower high-pressure water plugging rubber air bag at the end; the pressurized water pipe section between the two high-pressure water plugging rubber air bags is a permeable water pipe, and the permeable water pipe is provided with permeable holes, and the bottom of the permeable water pipe is closed;

[0009] A charging and pressure relief device, including an air pump, a pressure gauge and an air charging pipe, one end of the air charging pipe is connected to the air pump, and the other end is connected to the upper high-pressure water plugging rubber air bag, and the pressure gauge is arranged on the air charging pipe.

[0010] Furthermore, the upper end of the pressurized water pipe can be spliced with another pressurized water pipe through a water connection joint.

[0011] Furthermore, both the pressurized water pipe and the air charging pipe are rubber pipes with high tensile strength.

[0012] Furthermore, the high-pressure water plugging rubber air bag is a pipeline plugging air bag.

[0013] Furthermore, the outer surface of the high-pressure water plugging rubber air bag is thread-shaped along the axial direction.

[0014] Furthermore, the water connection joint includes an internal thread joint and an external thread joint, the internal thread joint and the external thread joint are threadedly connected, and a water stop rubber is also arranged between the internal thread joint and the external thread joint.

[0015] The utility model has the following advantages:

[0016] Compared with the traditional water pressure test, the utility model is simple to operate, requires less manpower, improves the test efficiency, and greatly saves the test time; it adopts a spliced pressurized water pipe, the joint splicing is simple, the weight is light, and it can be infinitely extended, especially suitable for deep-hole water pressure tests; it uses a high-pressure water plugging rubber air bag to block the hole, and is applicable to hole diameters in the range of 80mm - 150mm, with strong applicability; the outer surface of the high-pressure water plugging rubber air bag is thread-shaped along the axial direction, and the contact area with the hole wall can be increased by radial pressurization and expansion, improving the water stop effect.

Description of the Drawings

[0017] The following further describes the utility model with reference to the drawings in conjunction with the embodiments.

[0018] Figure 1 It is a schematic diagram of a deep-hole water pressure test system of the utility model.

[0019] Figure 2 For Figure 1 The partial enlarged view of A in

[0020] Figure 3 This is a schematic structural diagram of a water connection joint for a deep-hole water pressure test system of the present utility model.

Specific Embodiment

[0021] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the accompanying drawings and specific embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present utility model. For those conditions not specified in the embodiments, they shall be carried out according to conventional conditions or conditions recommended by the manufacturer. For reagents or instruments whose manufacturers are not indicated, they are all conventional products that can be obtained through commercial purchase.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. 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 therefore should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0024] Refer to Figure 1-2 , a deep-hole water pressure test system of the present utility model includes:

[0025] A water delivery device 1, including a water tank 11, a flow meter 12, and a pressurizing water pump 13, which are connected in sequence; the pressurizing water pump 13 can stably provide the water pressure required for the test, with uniform water output and reliable operation;

[0026] A pressurized water pipe 2, which is connected to the water outlet of the pressurizing water pump 13;

[0027] Two high-pressure water plugging rubber air bags 3 are interconnected with each other through a connecting pipe 4; the lower end of the pressurized water pipe 2 passes through the middle of the upper high-pressure water plugging rubber air bag 3 and is connected to the top of the lower high-pressure water plugging rubber air bag 3 at the end; the pressurized water pipe section 2 between the two high-pressure water plugging rubber air bags 3 is a permeable water pipe 21, and the permeable water pipe 21 is provided with permeable holes 22, and the bottom of the permeable water pipe 21 is closed;

[0028] The applicable aperture range of the high-pressure water plugging rubber air bag 3 is relatively large, and it is applicable to 80mm - 150mm. When the high-pressure water plugging rubber air bag 3 is lowered to the test depth, the high-pressure water plugging rubber air bag 3 is inflated through the air charging and discharging device 5 until the water flow can be completely blocked and then stopped, so as to block the water flow between the test section and the non-test section. The connecting air pipe 4 is a structure that connects the upper and lower high-pressure water plugging rubber air bags 3 to keep the pressure of the upper and lower air bags stable and consistent.

[0029] An air charging and discharging device 5, including an air pump 51, a pressure gauge 52 and an air charging pipe 53. One end of the air charging pipe 53 is connected to the air pump 51, and the other end is connected to the upper high-pressure water plugging rubber air bag 3, and the pressure gauge 52 is arranged on the air charging pipe 53.

[0030] Refer to Figure 3 In a specific implementation, a preferred embodiment: the upper end of the pressurized water pipe 2 can be spliced with another pressurized water pipe through a water connection joint 6.

[0031] In a specific implementation, a preferred embodiment: both the pressurized water pipe 2 and the air charging pipe 53 are rubber pipes with high tensile strength.

[0032] In a specific implementation, a preferred embodiment: the high-pressure water plugging rubber air bag 3 is a pipeline plugging air bag, which has the advantages of large deformation, high pressure resistance and no water leakage.

[0033] In a specific implementation, a preferred embodiment: the outer surface of the high-pressure water plugging rubber air bag 3 is in a spiral shape along the axial direction, and the contact area with the hole wall can be increased by radial pressurization and expansion, so as to improve the water stopping effect.

[0034] In a specific implementation, a preferred embodiment: the water connection joint 6 includes an internal thread joint 61 and an external thread joint 62, the internal thread joint 61 and the external thread joint 62 are threadedly connected, and a water stop rubber is also arranged between the internal thread joint 61 and the external thread joint 62. The pressurized water pipe 2 can be infinitely extended through the water connection joint 6.

[0035] In another embodiment of the present invention, its working process is as follows:

[0036] (1) Hole cleaning: Clean the hole of the drilling position 100 to be tested.

[0037] (2) Immersion of test instrument: According to the test depth, splice 6 groups of water connection joints to the pressure water pipe 2 to an appropriate length, and lower the two high-pressure water-blocking rubber airbags 3 to an appropriate depth.

[0038] (3) Pressure charging: For the high-pressure water pressure test of the borehole, the maximum test pressure shall be determined first, and the maximum test pressure shall be determined according to the industry standard NB / T 35113-2018.

[0039] Inflate the high-pressure water-blocking rubber airbag 2 through the pressure charging and discharging device 5 until the pressure gauge 52 is 0.3 - 0.5 MPa greater than the maximum test pressure (required by the specification of NB / T 35113-2018), that is, stop when the two high-pressure water-blocking rubber airbags 3 can completely block the hole.

[0040] (4) Test: Turn on the pressure pump 13 to reach the designed water pressure. Wait for the seepage to stabilize (i.e., the flow rate of the flow meter 12 is basically stable), and record the water pressure of the pressure pump 13 and the flow rate of the flow meter 12.

[0041] According to the recorded water flow rate Q, the test section length l, and the test section pressure P (the water pressure of the pressure pump), calculate the permeability rate according to the following formula:

[0042]

[0043] In the formula, q is the permeability rate of the test section, Lu; l is the test section length, m (the length of the permeable water pipe 21 is l, and l is generally 5 m), that is, the distance from the bottom of the upper high-pressure water-blocking rubber airbag 3 to the top of the lower high-pressure water-blocking rubber airbag 3; Q is the calculated flow rate, L / min, that is, the flow rate shown on the flow meter 12; P is the test section pressure, MPa, that is, the water pressure shown on the pressure pump 13.

[0044] The permeability rate of the test section is taken to two significant figures.

[0045] A pressure gauge is installed inside the pressure pump 13, and the pressure value P inside the test section (inside the water-filled section) can be read through the internal pressure sensor. Generally, it should be able to provide different staged water pressures such as 0.5 MPa, 0.8 MPa, 1 MPa, 1.2 MPa, 1.5 MPa, 2.0 MPa, 2.5 MPa, 3.0 MPa, 4.0 MPa, 5.0 MPa, etc.

[0046] (5) Pumping: Turn off the pressure pump 13 and stop the water supply. Release the air from the two high-pressure water-blocking rubber airbags 3 through the pressure charging and discharging device 5. After releasing the air, the pressure water pipe 2 can be lifted or continued to be lowered, and continue with the next group of tests.

[0047] In summary, compared with the traditional water pressure test, the utility model is simple to operate, requires less manpower, improves the test efficiency, and greatly saves the test time. It adopts a spliced pressure water pipe, with simple joint splicing, light weight, and can be infinitely extended, especially suitable for deep-hole water pressure tests. It uses a high-pressure water-blocking rubber airbag to seal the hole, and is applicable to hole diameters in the range of 80mm - 150mm, with strong applicability. The outer surface of the high-pressure water-blocking rubber airbag is threaded axially, and the contact area with the hole wall can be increased by radial pressurization and expansion, improving the water-stopping effect.

[0048] Although the specific implementation manners of the present utility model have been described above, those skilled in the art should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present utility model. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present utility model should be covered by the scope protected by the claims of the present utility model.

Claims

1. A deep-hole water pressure test system, characterized in that: Comprising: A water conveyance device, including a water tank, a flow meter, and a pressurizing water pump, which are connected in sequence; A pressurized water pipe, which is connected to the water outlet of the pressurizing water pump; Two high-pressure water-blocking rubber airbags, which are interconnected through a connecting pipe; the lower end of the pressurized water pipe passes through the middle of the upper high-pressure water-blocking rubber airbag, and the end is connected to the top of the lower high-pressure water-blocking rubber airbag; the pressurized water pipe section between the two high-pressure water-blocking rubber airbags is a permeable water pipe, and the permeable water pipe is provided with permeable holes, and the bottom of the permeable water pipe is closed; A charging and discharging pressure device, including an air pump, a pressure gauge, and an inflation pipe, one end of the inflation pipe is connected to the air pump, and the other end is connected to the upper high-pressure water-blocking rubber airbag, and the pressure gauge is arranged on the inflation pipe.

2. The deep-hole water pressure test system according to claim 1, characterized in that: The upper end of the pressurized water pipe can be spliced with another pressurized water pipe through a water connection joint.

3. The deep-hole water pressure test system according to claim 1, characterized in that: Both the pressurized water pipe and the inflation pipe are rubber pipes with high tensile strength.

4. The deep-hole water pressure test system according to claim 1, characterized in that: The high-pressure water-blocking rubber airbag is a pipeline plugging airbag.

5. A deep-hole water pressure test system according to claim 1, characterized in that: The outer surface of the high-pressure water-blocking rubber airbag is threaded axially.

6. The deep-hole water pressure test system according to claim 2, wherein: The water connection joint includes an internal thread joint and an external thread joint, which are threadedly connected, and a water-stop rubber is also arranged between the internal thread joint and the external thread joint.

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