Buried pipeline mechanical response test device under traffic load effect

Abstract

The utility model discloses a buried pipeline mechanical response test device under a traffic load effect, and relates to the technical field of buried pipeline mechanical response test. Comprising a test box body, the test box body is provided with a test mechanism used for mechanical response of the buried pipeline under the traffic load effect, the test mechanism comprises an adjusting assembly, the adjusting assembly comprises a sliding rail support fixed to the upper end of the test box body, and the sliding rail support is internally provided with a mounting support connected through a thread assembly; by means of water spraying simulation and compaction treatment, soil environments with different humidity and compaction degrees can be simulated, the test result is closer to the actual situation, and the device not only can be used for simulating pipeline mechanical response under the action of traffic loads, but also can be used for simulating pipeline mechanical response under the action of the traffic loads, and can also be used for simulating pipeline mechanical response under the action of the traffic loads. And the influence of different soil conditions on the pipeline performance can be researched by adjusting the water spraying amount and the compaction degree.

Description

Technical Field

[0001] This utility model relates to the field of buried pipeline mechanical response testing technology, specifically a buried pipeline mechanical response testing device under traffic load. Background Technology

[0002] As an important component of urban infrastructure, the mechanical response of buried pipelines under traffic loads has always been a key research focus in the engineering field.

[0003] Reference patent (publication number: CN109752255B; publication date: 2024-07-26) discloses a test device for the mechanical response of buried pipelines under traffic loads, including a box body, a test pipeline is set inside the box body, the test pipeline inside the box body is filled with soil, the two ends of the test pipeline are connected to the variable diameter plates, the variable diameter plates are fixed to the box body by variable diameter plate bolts, a reaction frame is connected to the box body, at least one actuator is set on the reaction frame, the actuator is connected to a hydraulic system, a sensor system is arranged on the test pipeline, a wire integration outlet is provided on the side of the box body, the sensor system is connected to the wire bundle, the wire bundle passes out from the wire integration outlet, a grouting port is buried in the soil inside the box body, the grouting port is located on the upper surface of the box body, and the grouting port is connected to a micro polymer grouting system through a grouting pipe.

[0004] The specific experiments were conducted using a stress monitoring unit, a displacement monitoring unit, and a data acquisition system. The stress monitoring unit employed resistance strain gauges, which were attached to the surface of the pipe to monitor its circumferential and axial stresses. The displacement monitoring unit included a laser displacement sensor and an earth pressure cell. The laser displacement sensor was mounted above the model box to monitor the vertical displacement of the pipe; the earth pressure cell was embedded in the soil surrounding the pipe to monitor changes in soil pressure. The data acquisition system was connected to the stress and displacement monitoring units, enabling real-time acquisition and storage of experimental data.

[0005] Based on the aforementioned patents, existing testing devices, when simulating traffic loads, struggle to accurately reproduce their complex characteristics and cannot flexibly adjust the loading position to adapt to different working conditions. In some traditional devices, the actuators and loading components are fixed in position, making it impossible to simulate the mechanical impact of vehicles traveling in different locations on the pipeline. This greatly limits comprehensive and in-depth research on the mechanical response of the pipeline. Furthermore, soil conditions significantly affect the mechanical properties of buried pipelines. However, most current testing devices suffer from problems such as limited adjustment methods and simulation range when simulating soil environments, making it difficult to simulate the impact of groundwater level changes on the interaction between the pipe and the soil, as well as the impact of soil compaction. Therefore, this utility model provides a testing device for the mechanical response of buried pipelines under traffic loads. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a test device for the mechanical response of buried pipelines under traffic loads. It solves the problems that existing test devices cannot accurately reproduce the complex characteristics of traffic loads, cannot flexibly adjust the loading position to adapt to different working conditions, and in some traditional devices, the actuators and loading components are fixed in position, making it impossible to simulate the mechanical effects of vehicles traveling in different positions on the pipeline, which greatly limits the comprehensive and in-depth study of the mechanical response of pipelines.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a test device for the mechanical response of buried pipelines under traffic loads, comprising a test chamber, wherein the test chamber is equipped with a test mechanism for the mechanical response of buried pipelines under traffic loads, the test mechanism comprising:

[0008] The adjustment assembly includes a slide rail bracket fixed to the upper end of the test chamber, an installation bracket connected by a threaded assembly inside the slide rail bracket, an actuator body at the upper end of the installation bracket, a load plate fixed to the telescopic end of the actuator body, an installation seat connected by a lifting assembly inside the test chamber, and a fixing assembly for the test pipeline inside the installation seat.

[0009] The simulation component includes a water guide pipe on one side wall of the mounting bracket, with nozzles evenly distributed on the lower end face of the water guide pipe, and a compaction plate connected to the mounting bracket via a pressing component on the other side wall of the mounting bracket.

[0010] Preferably, the threaded assembly includes a screw rotatably connected inside the slide rail bracket, the lower end of the mounting bracket is slidably connected to the inner wall of the slide rail bracket, the mounting bracket has a U-shaped structure, and the lower end surface of the load plate is provided with anti-slip texture.

[0011] Preferably, the lifting assembly includes a first hydraulic rod fixed to the inner wall of the test chamber, and the mounting base is fixedly connected to the telescopic end of the first hydraulic rod.

[0012] Preferably, the fixing component includes a mounting groove formed on the surface of the mounting base, a fixing plate fixed to the upper end of the mounting base, a second hydraulic rod fixed through the interior of the fixing plate, and a clamping ring fixed to the telescopic end of the second hydraulic rod, the clamping ring corresponding to the mounting groove.

[0013] Preferably, a water tank body is fixed to one side of the test chamber, a flexible hose is fixed through the upper end of the water tank body, the output end of the flexible hose is connected to the input end of the water pipe, and an opening and closing plate connected by bolts is provided on the front end face of the test chamber.

[0014] Preferably, the pressing assembly includes a U-shaped bracket fixed to one side wall of the mounting bracket, and a pair of third hydraulic rods are fixedly fixed inside the U-shaped bracket, with the compaction plate fixedly connected to the telescopic end of the third hydraulic rods.

[0015] Beneficial effects

[0016] This invention provides a test device for the mechanical response of buried pipelines under traffic loads. Compared with the prior art, it has the following advantages:

[0017] Firstly, the water in the main body of the water tank of this utility model flows into the water guide pipe through the hose under the action of the water pump, and is evenly sprayed into the soil in the test chamber through the nozzle to adjust the soil moisture content and simulate the interaction between the pipe and the soil under different humidity environments. Then, the soil is filled into the test chamber, and the third hydraulic rod is activated. Its telescopic end pushes the compaction plate to press down the soil, and the soil is compacted in layers to simulate the density of the actual backfill soil. Through water spraying simulation and compaction treatment, soil environments with different humidity and compaction degrees can be simulated, making the test results closer to the actual situation. It can not only be used to simulate the mechanical response of pipelines under traffic loads, but also to study the influence of different soil conditions on pipeline performance by adjusting the water spray volume and compaction degree.

[0018] Secondly, this utility model, by rotating the screw, causes the mounting bracket to slide horizontally on the inner wall of the slide rail bracket, thereby adjusting the position of the actuator body and the load plate on the test chamber. This adapts to the stress on the test pipeline under different position conditions. Then, the first hydraulic rod is activated, and its telescopic end drives the mounting seat to move up and down, adjusting the burial depth of the pipeline in the test chamber. This simulates the working conditions of different burial depths in actual engineering, realizing flexible adjustment of the horizontal position of the actuator body and the load plate, and improving the adaptability and versatility of the test device. 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 mounting base structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the slide rail bracket structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the compaction plate structure of this utility model.

[0023] In the diagram: 1. Test chamber; 2. Slide rail bracket; 201. Screw; 202. Mounting bracket; 203. Actuator body; 204. Load plate; 3. Water guide pipe; 301. Nozzle; 302. Hose; 303. Water tank body; 4. First hydraulic rod; 401. Mounting seat; 402. Mounting groove; 403. Fixing plate; 404. Second hydraulic rod; 405. Clamping ring; 5. Opening and closing plate; 6. U-shaped bracket; 601. Third hydraulic rod; 602. Compactor plate. 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] Please see Figures 1-4 This utility model provides a technical solution: a test device for the mechanical response of buried pipelines under traffic loads, comprising a test chamber 1, on which a test mechanism for the mechanical response of buried pipelines under traffic loads is provided, the test mechanism comprising:

[0026] The adjustment assembly includes a slide rail bracket 2 fixed at the upper end of the test chamber 1, an installation bracket 202 connected by a threaded assembly inside the slide rail bracket 2, an actuator body 203 at the upper end of the installation bracket 202, a load plate 204 fixed at the telescopic end of the actuator body 203, and a mounting seat 401 connected by a lifting assembly inside the test chamber 1. A fixing assembly for the test pipeline is provided inside the mounting seat 401.

[0027] The simulation component includes a water guide pipe 3 on one side wall of the mounting bracket 202, nozzles 301 evenly distributed on the lower end face of the water guide pipe 3, and a compaction plate 602 connected by a pressing component on the other side wall of the mounting bracket 202.

[0028] In a preferred embodiment, the threaded assembly includes a screw 201 rotatably connected inside the slide rail bracket 2. The lower end of the mounting bracket 202 is slidably connected to the inner wall of the slide rail bracket 2. The mounting bracket 202 has a U-shaped structure. The lower end face of the load plate 204 is provided with anti-slip texture. By rotating the screw 201, its threaded transmission drives the mounting bracket 202 to slide horizontally on the inner wall of the slide rail bracket 2, thereby adjusting the position of the actuator body 203 and the load plate 204 on the test chamber to adapt to the stress working of the test pipeline under different position conditions. After the mounting bracket 202 is adjusted into place, the actuator body 203 is fixed to the upper end of the mounting bracket 202, and the load plate 204 is fixed to the telescopic end of the actuator body 203. The actuator body 203 is activated, and traffic load is applied to the test pipeline through the load plate 204 to simulate the pipeline stress under actual traffic conditions.

[0029] The anti-slip texture on the lower end of the load plate 204 contacts the ground to simulate the friction of vehicle tires. The anti-slip texture enhances the contact friction between the load plate 204 and the soil, making the load transfer closer to the mechanical state of actual vehicle driving and improving the accuracy of the test simulation.

[0030] In a preferred embodiment, the lifting assembly includes a first hydraulic rod 4 fixed to the inner wall of the test chamber 1, a mounting base 401 fixedly connected to the telescopic end of the first hydraulic rod 4, and a fixing assembly including a mounting groove 402 on the surface of the mounting base 401, a fixing plate 403 fixed to the upper end of the mounting base 401, a second hydraulic rod 404 fixedly passing through the interior of the fixing plate 403, and a clamping ring 405 fixed to the telescopic end of the second hydraulic rod 404. The clamping ring 405 corresponds to the mounting groove 402. When the pipe is placed into the mounting groove 402, the second hydraulic rod 404 is activated, and its telescopic end pushes the clamping ring 405 to clamp the outer wall of the pipe. The fixing plate 403 provides support to ensure that the pipe remains fixed during the test and avoids displacement from affecting the accuracy of the data. Then, the first hydraulic rod 4 is activated, and its telescopic end drives the mounting base 401 to move up and down to adjust the burial depth of the pipe in the test chamber 1, simulating the working conditions of different burial depths in actual engineering.

[0031] In a preferred embodiment, a water tank body 303 is fixed to one side of the test chamber 1, and a flexible hose 302 is fixed through the upper end of the water tank body 303. The output end of the flexible hose 302 is connected to the input end of the water pipe 3. The front end of the test chamber 1 is provided with an opening and closing plate 5 connected by bolts. Water in the water tank body 303 flows into the water pipe 3 through the flexible hose 302 under the action of the water pump, and is evenly sprayed into the soil in the test chamber 1 through the nozzle 301 to adjust the soil moisture content and simulate the interaction between the pipe and the soil under different humidity environments.

[0032] In a preferred embodiment, the pressing component includes a U-shaped bracket 6 fixed to one side wall of the mounting bracket 202, and a pair of third hydraulic rods 601 are fixedly fixed inside the U-shaped bracket 6. The compaction plate 602 is fixedly connected to the telescopic end of the third hydraulic rods 601.

[0033] By opening the hinged plate 5, soil is filled into the test chamber 1. The third hydraulic rod 601 is activated, and its telescopic end pushes the compaction plate 602 down to compact the soil in layers to simulate the density of actual backfill soil.

[0034] By simulating water spraying and compaction, soil environments with different humidity and compaction degrees can be simulated, making the test results closer to the actual situation. This can not only be used to simulate the mechanical response of pipelines under traffic loads, but also to study the impact of different soil conditions on pipeline performance by adjusting the amount of water sprayed and the degree of compaction.

[0035] The buried pipeline mechanical response test uses resistance strain gauges, which are attached to the surface of the pipeline, to monitor the circumferential and axial stresses of the pipeline. The test also includes a thin-film earth pressure gauge, strain gauges, force sensors, point-type optical fibers, distributed optical fibers, and a modem. The test is conducted with reference to patent CN201910094016.6, "A Test Device for the Mechanical Response of Buried Pipelines under Traffic Loads," which is prior art and will not be elaborated further.

[0036] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0037] During the test, first rotate the screw 201, which drives the mounting bracket 202 to slide horizontally on the inner wall of the slide rail bracket 2 through the threaded transmission. Adjust the position of the actuator body 203 and the load plate 204 on the test box to adapt to the force requirements of the test pipeline at different positions. After the adjustment is in place, fix the actuator body 203 on the upper end of the mounting bracket 202 and fix the load plate 204 on the telescopic end of the actuator body 203. Start the actuator body 203 and apply traffic load to the test pipeline through the load plate 204. The anti-slip texture on the lower end of the load plate 204 contacts the soil to simulate the friction of vehicle tires, making the load transmission closer to the mechanical state of actual vehicle driving.

[0038] Simultaneously, the pipe is placed into the mounting slot 402 of the mounting base 401, and the second hydraulic rod 404 is activated. Its telescopic end pushes the clamping ring 405 to clamp the outer wall of the pipe. The fixing plate 403 provides support. After the pipe is fixed, the first hydraulic rod 4 is activated to move the mounting base 401 up and down, adjusting the burial depth of the pipe in the test chamber 1 to simulate working conditions at different burial depths. Then, the opening and closing plate 5 is opened to fill the test chamber 1 with soil. The third hydraulic rod 601 is activated, and its telescopic end pushes the compaction plate 602 to press down the soil, compacting it in layers to simulate the density of the actual backfill soil. Afterward, the water in the water tank body 303 flows into the water guide pipe 3 through the hose 302 under the action of the water pump, and is evenly sprayed into the soil in the test chamber 1 through the nozzle 301 to adjust the soil moisture content and simulate the interaction between the pipe and the soil under different humidity environments. Through water spraying simulation and compaction treatment, soil environments with different humidity and compaction degrees are simulated, thereby comprehensively simulating the mechanical response of the pipe under different soil conditions under traffic load.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test device for the mechanical response of buried pipelines under traffic loads, comprising a test chamber (1), characterized in that: The test chamber (1) is equipped with a test mechanism for the mechanical response of buried pipelines under traffic loads. The test mechanism includes: The adjustment assembly includes a slide rail bracket (2) fixed at the upper end of the test chamber (1), an installation bracket (202) connected by a threaded assembly inside the slide rail bracket (2), an actuator body (203) at the upper end of the installation bracket (202), a load plate (204) fixed at the telescopic end of the actuator body (203), an installation seat (401) connected by a lifting assembly inside the test chamber (1), and a fixing assembly for the test pipeline inside the installation seat (401). The simulation component includes a water guide pipe (3) provided on one side wall of the mounting bracket (202), and nozzles (301) are evenly distributed on the lower end face of the water guide pipe (3). The other side wall of the mounting bracket (202) is provided with a compaction plate (602) connected by a pressing component.

2. The test device for the mechanical response of buried pipelines under traffic loads according to claim 1, characterized in that: The threaded assembly includes a screw (201) rotatably connected inside the slide rail bracket (2), the lower end of the mounting bracket (202) is slidably connected to the inner wall of the slide rail bracket (2), the mounting bracket (202) has a U-shaped structure, and the lower end surface of the load plate (204) is provided with anti-slip texture.

3. The test device for the mechanical response of buried pipelines under traffic loads according to claim 1, characterized in that: The lifting assembly includes a first hydraulic rod (4) fixed to the inner wall of the test chamber (1), and the mounting base (401) is fixedly connected to the telescopic end of the first hydraulic rod (4).

4. The test device for the mechanical response of buried pipelines under traffic loads according to claim 1, characterized in that: The fixing component includes a mounting groove (402) opened on the surface of the mounting base (401), a fixing plate (403) fixed at the upper end of the mounting base (401), a second hydraulic rod (404) fixed through the interior of the fixing plate (403), and a clamping ring (405) fixed at the telescopic end of the second hydraulic rod (404), the clamping ring (405) corresponding to the mounting groove (402).

5. The test device for the mechanical response of buried pipelines under traffic loads according to claim 1, characterized in that: A water tank body (303) is fixed on one side of the test chamber (1). A hose (302) is fixed through the upper end of the water tank body (303). The output end of the hose (302) is connected to the input end of the water pipe (3). A hinged plate (5) connected by bolts is provided on the front end face of the test chamber (1).

6. The test device for the mechanical response of buried pipelines under traffic loads according to claim 1, characterized in that: The pressing assembly includes a U-shaped bracket (6) fixed to one side wall of the mounting bracket (202), and a pair of third hydraulic rods (601) are fixedly fixed inside the U-shaped bracket (6). The compaction plate (602) is fixedly connected to the telescopic end of the third hydraulic rods (601).

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