Waterproof test device and method for underground comprehensive pipe gallery

Abstract

This invention relates to the field of waterproofing testing technology for underground utility tunnels, specifically to a waterproofing testing device and method for underground integrated utility tunnels. One end of the outer pipe is open, simulating the end of the pipe segment with a socket at the tunnel joint. One end of the inner pipe is also open, and this open end is inserted into the open end of the outer pipe, simulating the socket connection structure at the tunnel joint. A sealing ring is provided on the outer wall of the open end of the inner pipe, simulating the sealing element of the pipe segment at the tunnel joint. The outer and inner pipes are placed in a test chamber, which is connected to a water source. The groundwater conditions in the area where the utility tunnel is located are simulated by controlling the water pressure and flow rate. The waterproofing performance of the sealing ring is measured through testing, thus determining the waterproofing capability of the sealing rubber ring at the socket joint of the utility tunnel that most closely approximates the actual working conditions. This has significant practical value for the waterproofing design and actual engineering of rectangular jacking pipes.

Description

Technical Field

[0001] This invention belongs to the field of testing technology for waterproofing projects in utility tunnels, specifically relating to a waterproofing testing device and method for underground integrated utility tunnels. Background Technology

[0002] Integrated utility tunnels refer to underground urban pipeline corridors, which are tunnel-like underground spaces built in cities to integrate various pipelines such as electricity, communications, water supply and drainage, and natural gas according to specific spatial layout requirements. They also include dedicated maintenance access, hoisting ports, and monitoring systems, forming an integrated underground pipeline corridor. Waterproofing is a major challenge during the construction of integrated utility tunnels. Leaks in the tunnel are often more difficult to resolve and repair than roof or exterior wall waterproofing, and can even lead to safety accidents. Therefore, to promote the development of integrated utility tunnels, it is necessary to select appropriate construction methods based on local conditions and study the characteristics of the tunnel's sealing structure to scientifically and rationally formulate waterproofing solutions. Existing testing devices generally test only one waterproofing parameter and cannot accurately obtain the overall waterproofing parameters of the utility tunnel.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a waterproof testing device and method for underground integrated pipe corridors.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A waterproofing testing device for underground utility tunnels, comprising:

[0007] The outer tube has one open end, which is used to simulate the end of the pipe segment with a receiving interface at the pipe gallery joint.

[0008] An inner tube, one end of which is an open end, is inserted into the open end of the outer tube to simulate the plug-and-socket connection structure at the pipe gallery joint.

[0009] The outer wall of the open end of the inner tube is provided with a sealing ring, which is used to simulate the sealing element of the pipe segment at the pipe gallery joint;

[0010] The outer pipe and the inner pipe are placed in a test chamber, which is connected to a water source. The groundwater conditions in the area where the pipe gallery is located are simulated by controlling the water pressure and flow rate.

[0011] Preferably, the test chamber further includes:

[0012] Push rods, two of which are located on opposite inner walls of the test chamber, apply stress to the outer tube and the inner tube respectively to simulate the jacking force experienced during actual installation of the pipe gallery;

[0013] A water pipe is provided on the side wall of the test chamber to inject water to simulate the groundwater conditions in the area where the pipe gallery is located.

[0014] A pressure plate is provided at the opening of the test chamber to seal the test chamber.

[0015] Preferably, the test chamber further includes:

[0016] A soil sample is filled in the test chamber to simulate the soil conditions of the area where the utility tunnel is located. A pressure plate is slidably sealed at the opening of the test chamber along the longitudinal direction. An extrusion rod is provided above the pressure plate to extrude the soil sample to simulate the soil pressure in the area where the utility tunnel is located.

[0017] Preferably, a fluorescent agent is added to the water source injected into the test chamber, and a camera is installed inside the outer tube facing the junction of the outer tube and the inner tube;

[0018] A pressure gauge and a flow meter are installed on the water pipe.

[0019] Preferably, the bottom of the test chamber is provided with a first top rod and a second top rod located at both ends of the outer tube to drive the outer tube and the inner tube to deflect, thereby measuring the effect of the deflection angle on the sealing performance of the pipe gallery.

[0020] Preferably, a displacement gauge is installed at each end of the outer tube to detect the deflection angle of the outer tube by measuring the longitudinal movement distance of the two displacement gauges.

[0021] Preferably, the outer wall of the inner tube is provided with no less than two mounting grooves for corresponding sealing rings, and the outer wall of the sealing ring is polished with sandpaper to adjust the roughness of the sealing ring.

[0022] A waterproofing test method for underground utility tunnels, comprising conducting the test using any of the aforementioned test devices, including:

[0023] Step S1: Assemble the outer and inner pipes to simulate the pipe gallery sealing structure, connect the water source to the test device, and record the water flow and pressure using a flow meter and a pressure gauge.

[0024] Step S2: Start filling with water and gradually increase the water pressure. Record the relationship between water pressure and flow rate during the filling process.

[0025] Step S3: Observe whether there is water leakage at the connection between the outer pipe and the inner pipe, and record the water pressure and water flow parameters under the leakage condition;

[0026] Step S4: After changing the experimental parameters, repeat steps S1-S3, record the experimental data, and plot the above data as a curve.

[0027] Preferably, in step S4, the height of the sealing ring between the outer wall of the inner tube and the inner wall of the outer tube is changed to verify the effect of different sealing ring compression heights on the waterproof performance of the joint.

[0028] By changing the deflection angles of the inner and outer pipes, the impact of different deflection angles on the waterproof performance of the joint was verified.

[0029] Preferably, in step S4, one or two sealing rings are set up for pressure testing to study the effect of single or double sealing rings on the waterproof performance of the joint.

[0030] Beneficial effects: The waterproof performance of the water-stop sealing ring measured by the test can determine the waterproof capability of the water-stop rubber ring at the pipe rack socket joint that is closest to the actual working conditions. This has great practical value for the waterproof design of rectangular jacking pipes and actual engineering projects. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0032] Figure 1 This is a simplified structural diagram of the test chamber in a specific embodiment of the present invention;

[0033] In the diagram: 1. Test chamber; 2. Water pipe; 3. Outer pipe; 4. Inner pipe; 5. Push rod; 6. First push rod; 7. Pressure plate; 8. Extrusion rod; 9. Camera; 10. Sealing ring; 11. Push plate; 12. Second push rod. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0035] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0037] like Figure 1 As shown, a waterproofing test device for an underground utility tunnel includes an outer pipe 3 and an inner pipe 4. Both the outer pipe 3 and the inner pipe 4 are square pipes made of Q235 steel, used to simulate the rectangular jacking pipe F-type socket joint of an actual utility tunnel. One end of the outer pipe 3 is an open end, used to simulate the end of the pipe segment with a socket at the joint of the utility tunnel. One end of the inner pipe 4 is an open end, used to simulate the end of the pipe segment inserted into the socket at the joint of the utility tunnel. The open end of the inner pipe 4 is inserted into the open end of the outer pipe 3, used to simulate the socket connection structure at the joint of the utility tunnel. The outer wall of the open end of the inner pipe 4 is provided with a sealing ring 10, used to simulate the sealing element of the pipe segment at the joint of the utility tunnel, thereby simulating the actual working conditions of the utility tunnel. This device tests the influence of different parameters on the waterproofing capability of the underground utility tunnel, provides guidance data for subsequent construction, and ensures that the joint between the two sections of the utility tunnel can effectively prevent water leakage during actual construction.

[0038] The outer pipe 3 and the inner pipe 4 are placed in the test chamber 1, which is connected to a water source. By controlling the water pressure and flow rate, the groundwater conditions in the area where the pipe gallery is located are simulated, thereby obtaining the waterproof condition of the pipe gallery under real conditions and improving the authenticity of the data.

[0039] In an optional embodiment, the main body of the test chamber 1 is a square structure with an open experimental cavity at the top. In order to simulate the jacking force experienced during the actual installation of the pipe gallery, push rods 5 are set inside the test chamber 1. The push rods 5 can be hydraulic cylinders or pneumatic cylinders. The two push rods 5 are located on the two opposite inner walls of the test chamber 1 and respectively abut against the sealing ends of the outer pipe 3 and the inner pipe 4 to apply stress to the outer pipe 3 and the inner pipe 4 respectively. The jacking force that should be applied to the outer pipe 3 and the inner pipe 4 is calculated by proportional scaling, and then the jacking force is simulated in the form of external force application.

[0040] A push plate 11 is hinged to one end of the push rod 5 corresponding to the inner tube 4 or the outer tube 3. The shape of the push plate 11 is adapted to the sealing end of the inner tube 4 or the outer tube 3, and it is fixed to the end of the inner tube 4 or the outer tube 3 by bolts, so as to ensure that the push plate 11 can still apply stress in the tilted state. Pressure sensors are respectively provided between the push plate 11 and the inner tube 4 or the outer tube 3 to ensure the accuracy of the pushing force.

[0041] A water pipe 2 is provided on the side wall of the test chamber 1, through which water is introduced and discharged, thereby using a water pump to inject water to simulate the groundwater state of the area where the pipe gallery is located; a pressure plate 7 is set at the open end of the test chamber 1 to seal the test chamber 1.

[0042] In an optional embodiment, multiple water pipes 2 are provided on the four side walls of the test chamber 1 around the perimeter. The multiple water pipes 2 are arranged in an array on the corresponding side walls of the test chamber 1. According to the seepage field of the area where the pipe gallery is located, water is introduced or discharged into different water pipes 2 selected on different side walls of the test chamber 1 (generally two opposite side walls are selected) to simulate the real seepage field.

[0043] During actual water injection, the water pipe 2 is selected according to the flow direction of the seepage field. One or more water pipes 2 can be selected at the same time as the water inlet pipe and the water outlet pipe (at least one water inlet pipe and one water outlet pipe). Except for the water pipes 2 selected as the water inlet pipe and the water outlet pipe, the other water pipes 2 are sealed during the test.

[0044] No fewer than four water pipes 2 are provided on any side of the test chamber 1. The four water pipes 2 are arrayed on the side wall of the test chamber 1, thus dividing the side wall of the test chamber 1 into four equal parts, so that different water pipes 2 can be rotated according to the actual seepage field requirements.

[0045] Of course, there can be 6, 8, 10 or 12 water pipes 2 on the side wall of each test chamber 1.

[0046] In an optional embodiment, the outer tube 3 is equipped with a camera 9 facing the joint between the outer tube 3 and the inner tube 4 to observe whether water seepage occurs at the joint. In order to accurately observe the leakage in the dark, a fluorescent agent is added to the water source injected into the test chamber 1. The camera 9 can be a 360-degree camera 9, or four cameras 9 can be set to correspond to the four side walls of the test chamber 1 respectively. The camera 9 is equipped with a light to excite the fluorescent agent.

[0047] A pressure gauge and a flow meter are installed on the water pipe 2 to provide the most accurate understanding of the water injection status.

[0048] In this embodiment, in order to more realistically simulate the soil conditions of the area where the utility tunnel is located, a soil sample is filled into the test chamber 1. The soil sample can be taken from the actual construction site. At this time, the pressure plate 7 slides longitudinally and seals the opening of the test chamber 1. For example, a piston structure is formed by setting a sealing strip corresponding to the inner wall of the test chamber 1 on the outer edge of the pressure plate 7. An extrusion rod 8 is provided above the pressure plate 7. The extrusion rod 8 can be a hydraulic rod, which is used to extrude the soil sample to simulate the soil pressure in the area where the utility tunnel is located.

[0049] When setting up soil samples, water is first injected for 1-5 minutes before various data are measured to accurately reconstruct the soil condition of the underground seepage field.

[0050] In an optional embodiment, the bottom of the test chamber is provided with a first top rod and a second top rod located at both ends of the outer tube. Both the first top rod 6 and the second top rod 12 are hydraulic rods. A top plate is hinged to the piston end of the top rod. A pressure sensor is provided between the top plate and the outer tube. Thus, the first top rod 6 is used to apply load to the model to measure the bending and shear resistance data and explore the bending and shear resistance of the pipe gallery.

[0051] In an optional embodiment, the first push rod 6 and the second push rod 12 are pushed upwards respectively. When the inner tube and the outer tube are separated by the push plate 11, the inner tube and the outer tube are deflected. By changing the deflection angle of the outer wall of the tube 4 and the outer tube 3, the influence of different deflection angles on the waterproof performance of the joint is investigated.

[0052] A displacement gauge is installed at both the beginning and end of the inner and outer pipes. The first jacking rod 6 is used to lift the inner and outer pipes upward, causing them to deflect. The displacement gauges can be used to determine the deflection angle. The adjustment of the deflection angle of the pipe gallery is simulated based on the lifting height of the first jacking rod 6.

[0053] Furthermore, by simultaneously lifting the first jacking rod 6 and the second jacking rod, a jacking force is applied to the outer pipe, thereby applying a load to the model and testing the bending and shear resistance of the pipe gallery.

[0054] In an optional embodiment, the outer wall of the inner tube 4 is provided with no less than two mounting grooves corresponding to the sealing rings 10. The outer wall of the sealing rings 10 is polished with sandpaper to adjust the roughness of the sealing rings 10. The influence of water-stop sealing rings with different hardness and roughness on the waterproof performance of the joint is investigated. The hardnesses are 45HA, 55HA, 65HA, and 75HA, respectively; the roughnesses are 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1.0μm, 1.1μm, and 1.2μm, respectively.

[0055] Based on the above testing equipment, this application also provides a waterproofing test method for underground utility tunnels, including:

[0056] Step S1: Prepare an underground integrated pipe gallery model and ensure that the connection points of the model conform to the actual situation. Specifically, assemble the outer pipe 3 and inner pipe 4 to simulate the sealed structure of the pipe gallery. Connect the water source to the test device and record the water flow and pressure through a flow meter and a pressure gauge to ensure that the flow velocity and pressure of the seepage field inside the test chamber 1 are understood.

[0057] Step S2: Start filling with water and gradually increase the water pressure. Record the relationship between water pressure and flow rate during the filling process. Step S3: Observe whether there is water leakage at the connection between the outer pipe 3 and the inner pipe 4. Record the water pressure and water flow rate parameters under leakage conditions. Step S4: Repeat steps S1-S3 after changing the experimental parameters, record the experimental data, and plot the above data as a curve.

[0058] In an optional embodiment, in step S4, different geological conditions are simulated by changing the test parameters; the actual geological parameters include, but are not limited to, soil condition, seepage field pressure, flow rate, direction, soil pressure in the area, jacking force, the angle between the inner pipe 4 and the outer pipe 3, the deflection angle, the height, quantity, hardness, roughness, etc. For example, in step S4, the height of the sealing ring between the outer wall of the inner pipe 4 and the inner wall of the outer pipe 3 is changed, and the sealing ring is a water-stopping rubber strip, thereby verifying the effect of different sealing ring heights on the waterproof performance of the joint; the deflection angle between the inner pipe 4 and the outer pipe 3 is also changed to verify the effect of different deflection angles on the waterproof performance of the joint.

[0059] Alternatively, the deflection angle can be set to ±0.03 rad, and the height of the sealing ring can be increased in increments of 1 mm. Experiments can be conducted under different working conditions to explore the effect of different sealing ring heights on the waterproof performance of the joint, so as to find the optimal working condition under the interaction conditions.

[0060] Alternatively, the installation gap can be fixed at 15mm, and the pipe section installation deflection angles can be -0.03, -0.02, -0.01, +0.01, +0.02, and +0.03, respectively.

[0061] Alternatively, one or two sealing rings can be set up for pressure testing to study the effect of single or double sealing rings on the waterproof performance of the joint, and to explore the effect of water-stop sealing rings with different hardness and roughness on the waterproof performance of the joint, with hardnesses of 45HA, 55HA, 65HA and 75HA respectively.

[0062] Alternatively, the roughness of the sealing ring can be changed by sanding it with sandpaper, and then tested with a roughness tester. The roughness values ​​are 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1.0μm, 1.1μm, and 1.2μm, respectively.

[0063] Generally, the test consists of two phases: the water filling phase and the main test phase. During the water filling phase, the tank is completely filled with water, and the occurrence of water leakage is observed.

[0064] In the main testing phase, the water pressure was first increased from 0 to 0.1 MPa and maintained for 24 hours; then increased from 0.1 MPa to 0.2 MPa and maintained for 24 hours; finally, the water pressure was increased from 0.2 MPa to 0.3 MPa and maintained for 24 hours; and finally, the pressure was released. Based on the experimental data analysis, conclusions were drawn regarding the waterproofing capacity of the underground utility tunnel, and the main influencing factors were analyzed.

[0065] The leakage situation under different water pressures was statistically analyzed, and the timing of leakage was recorded to obtain the maximum water pressure that the pipe gallery could withstand under different operating conditions.

[0066] Alternatively, the design water pressure of the section to be constructed can be obtained in advance, and the parameters of sealing ring height, deflection angle, and roughness can be adjusted while maintaining the water pressure, thereby obtaining the optimal working conditions for a certain construction site.

[0067] During the measurement process, the leakage rate was observed, the waterproofing capacity of the pipe gallery connection was assessed, and curves were plotted based on the leakage situation and different operating parameters. The water pressure resistance range of the pipe gallery connection was determined through analysis.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention shall be within the scope of protection of the pending claims of the present invention.

Claims

1. A waterproof test device for an underground utility tunnel, characterized by, The utility model relates to a test box for simulating the installation of pipe gallery, comprising: an outer tube, one end of which is open, for simulating the end of a pipe section with a receiving port at a pipe gallery joint; an inner tube, one end of which is open, the open end of the inner tube being inserted into the open end of the outer tube, for simulating the inserted-receiving connection structure at the pipe gallery joint; wherein the outer wall of the open end of the inner tube is provided with a sealing ring for simulating the sealing element of the pipe section at the pipe gallery joint; the outer tube and the inner tube are placed in the test box, and the test box is connected with a water source, the water pressure and flow rate of which are controlled to simulate the underground water state of the area where the pipe gallery is located; the test box further comprises: push rods, two of which are respectively located on the two inner walls of the test box opposite to each other to respectively apply stress to the outer tube and the inner tube to simulate the jacking force actually applied to the pipe gallery during installation; water guide pipes, which are provided on the side walls of the test box to inject water to simulate the underground water state of the area where the pipe gallery is located; a pressing plate, which is arranged at the opening of the test box to seal the test box; first and second jacks are arranged at the two ends of the outer tube at the bottom of the test box to drive the outer tube and the inner tube to deflect, so as to measure the influence of the deflection angle on the sealing performance of the pipe gallery; a push plate is hingedly arranged at one end of the inner tube or the outer tube corresponding to the push rod, the push plate is shaped to match the sealing end of the inner tube or the outer tube, and is fixed to the end of the inner tube or the outer tube by means of bolts, so that the push plate can still apply stress in the inclined state, and a pressure sensor is arranged between the push plate and the inner tube or the outer tube; a plurality of water guide pipes are arranged on the four side walls of the test box in an array, different water guide pipes on different side walls of the test box are respectively injected with water or discharged from water according to the set seepage field of the area where the pipe gallery is located, so as to simulate the real seepage field; during actual water injection, the water guide pipes are selected according to the flow direction of the seepage field, one or more water guide pipes can be selected as water inlet pipes and water outlet pipes at the same time, and the remaining water guide pipes are sealed during the test except the selected water guide pipes as the water inlet pipes and the water outlet pipes; the test box is filled with soil samples, which are taken from the actual construction site, at this time, the pressing plate is longitudinally slid to seal the opening of the test box, a sealing strip corresponding to the inner wall of the test box is arranged on the outer edge of the pressing plate to form a piston structure, and an extrusion rod is arranged above the pressing plate to extrude the soil samples to simulate the earth pressure of the area where the pipe gallery is located; first and second jacks are arranged at the two ends of the outer tube at the bottom of the test box, a push plate is hingedly arranged on the piston end of the jack, a pressure sensor is arranged between the push plate and the outer tube, so that the bending and shearing resistance data are measured by applying load to the model through the first jack to explore the bending and shearing resistance of the pipe gallery; the first and second jacks are respectively pushed upward, the inner tube and the outer tube deflect under the condition that the inner tube and the outer tube are away from each other and limited by the push plate, the deflection angle of the outer wall of the pipe and the outer tube is changed, and the influence of different deflection angles on the waterproof performance of the joint is explored; a displacement meter is arranged at each of the first and second jacks to detect the deflection angle of the outer tube through the longitudinal movement distance of the two displacement meters.

2. The waterproof test device for underground utility tunnels according to claim 1, characterized by the test box further comprises: The soil sample is filled in the test box to simulate the soil condition of the area where the pipe gallery is located. The pressing plate is longitudinally sealed to the opening of the test box. An extrusion rod is arranged above the pressing plate to extrude the soil sample to simulate the earth pressure of the area where the pipe gallery is located.

3. The waterproof test device for underground utility tunnels according to claim 1, characterized by A fluorescent agent is added to the water source injected into the test box. A camera is arranged inside the outer pipe to face the joint between the outer pipe and the inner pipe. A pressure gauge and a flow meter are arranged on the water guide pipe.

4. The waterproof test device for underground utility tunnels according to claim 1, characterized by The outer wall of the inner pipe is provided with installation grooves for not less than two corresponding sealing rings. The outer wall of the sealing ring is polished by sandpaper to adjust the roughness of the sealing ring.

5. A waterproof test method for an underground utility tunnel, which is performed by the test apparatus according to any one of claims 1 to 4, characterized by, The method comprises the following steps: Step S1: Assemble the outer pipe and the inner pipe to simulate the sealing structure of the pipe gallery. Connect the water source to the test device and record the flow and pressure of the water through the flow meter and the pressure gauge. Step S2: Start water injection and gradually increase the water pressure. Record the relationship between the water pressure and the flow during the water injection process. Step S3: Observe whether there is water leakage at the joint between the outer pipe and the inner pipe. Record the water pressure and water flow parameters under the water leakage state. Step S4: Repeat steps S1-S3 after changing the experimental parameters. Record the experimental data and draw the above data into a curve graph.

6. The waterproof test method for the underground utility tunnel according to claim 5, wherein In step S4, the height of the sealing ring between the outer wall of the inner pipe and the inner wall of the outer pipe is changed to verify the influence of different sealing ring compression heights on the waterproof performance of the joint. The deflection angle of the inner pipe and the outer pipe is changed to verify the influence of different deflection angles on the waterproof performance of the joint.

7. The waterproof test method of the underground comprehensive pipe gallery according to claim 5, wherein In step S4, one or two sealing rings are arranged respectively to test the pressure and study the influence of single and double sealing rings on the waterproof performance of the joint.

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