Visual test device for simulating concrete pile foundation in marine environment

Abstract

The utility model discloses a visual test device for simulating a concrete pile foundation in a marine environment, belongs to the technical field of tide simulation in the marine environment, and solves the problem that an existing pile foundation test device cannot simulate the influence of tide circulation on the pile foundation in the marine environment. The device specifically comprises a test box and a liquid storage box which are communicated with each other through a water delivery pipeline and a return pipeline; simulated seawater is contained in the liquid storage tank; the test box is filled with foundation soil, and a pile foundation sample is embedded in the foundation soil. According to the device, simulated seawater is conveyed into the test box through the water conveying pipeline, the liquid level of the simulated seawater in the test box rises, and the influence of the flood tide process on a pile foundation sample is simulated; simulated seawater in the test box is conveyed to the liquid storage box through the backflow pipeline, and the influence of the ebb tide process on the pile foundation sample is simulated; the influence of tidal cycle on the durability of the pile foundation sample can be intuitively analyzed, and the visual research of the pile foundation sample is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of tidal simulation technology in marine environment, especially relate to a kind of visual test device of simulating concrete pile foundation in marine environment. BACKGROUND

[0002] When carrying out engineering construction and ground treatment under marine environment, pile foundation is often built in ground soil body to strengthen the bearing capacity of foundation;But pile foundation is in marine environment for a long time, is influenced by seawater erosion, tide scouring etc., so that its durability is greatly weakened compared with land environment;Therefore, the durability of pile foundation in marine environment becomes an important index to judge its firmness;Therefore, it is necessary to test and evaluate the durability of pile foundation under marine environment.

[0003] In marine environment, due to the rise and fall of groundwater level caused by tide, the pile structure buried in the ground is soaked and scoured by seawater many times;The part of pile body exposed to the ground will be scoured by rainfall, even acid rain, which will seriously affect the durability of underground structure. The existing test device for simulating rainfall and tidal cycle often only considers the influence of dry-wet cycle, but for marine foundation, there is no completely dry state, and pile foundation structure is always buried in the ground in a humid state, so the traditional dry-wet cycle cannot effectively represent the influence of tidal cycle on pile foundation structure underground, and cannot simulate the change of pile foundation structure in natural marine environment. UTILITY MODEL CONTENT

[0004] In view of the deficiencies in the prior art, the utility model provides a kind of visual test device of simulating concrete pile foundation in marine environment, solve the problem that current pile foundation test device cannot simulate the influence of tidal cycle in marine environment on pile foundation.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme that:

[0006] A kind of visual test device of simulating concrete pile foundation in marine environment, including test box and storage tank, test box and storage tank are communicated by water delivery pipeline and reflux pipeline;Storage tank is filled with simulated seawater;Test box is filled with ground soil, and pile foundation sample is buried in ground soil.

[0007] In the present scheme, pile foundation sample is buried in ground soil in test box, simulated seawater is transported to test box interior by water delivery pipeline, the liquid level of simulated seawater in test box interior rises, simulating the influence of tide rising process on pile foundation sample;Simulated seawater in test box is transported to storage tank by reflux pipeline, simulating the influence of tide falling process on pile foundation sample;Visual research on pile foundation sample under marine environment is realized, and the influence of tidal cycle on the durability of pile foundation sample can be analyzed intuitively.

[0008] Further, the test box is internally provided with a filter screen, the filter screen divides the internal space of the test box into a water inlet chamber and a test chamber; the water inlet pipeline is connected to the water inlet chamber; and the foundation soil is filled in the test chamber.

[0009] In the present scheme, the filter screen is provided, when the simulated seawater is delivered to the test chamber, the simulated seawater is first delivered to the water inlet chamber through the water inlet pipeline, and then the simulated seawater enters the test chamber through the filter screen; in this process, the filter screen can slow down the flow of the simulated seawater, so as to avoid that the simulated seawater directly scours the foundation soil, and the scouring degree of each pile foundation sample in the test chamber is greatly different, which affects the test results. On the other hand, the filter screen is also used to block the foundation soil, so as to avoid that the foundation soil is delivered to the liquid storage tank along with the simulated seawater during the simulation of the ebb tide process.

[0010] Further, the water inlet pipeline comprises a water inlet main pipe, one end of the water inlet main pipe is connected to the liquid storage tank; the other end of the water inlet main pipe is branched into a spray pipe and a water inlet branch pipe, wherein the water inlet branch pipe is communicated with the water inlet chamber, and the spray pipe is communicated with a spray assembly arranged on the top of the test box.

[0011] In the present scheme, the simulated seawater flows into the water inlet chamber through the water inlet main pipe and the water inlet branch pipe in sequence, and then flows into the test chamber from the water inlet chamber, so as to simulate the process of the rising tide; the simulated seawater flows into the spray assembly from the spray pipe through the water inlet main pipe and the spray pipe in sequence, so as to simulate the process of the rainfall, so as to test the influence of the rainfall scouring on the part of the pile foundation exposed to the ground.

[0012] Further, the spray assembly comprises a plurality of spray branch pipes; one end of each of the plurality of spray branch pipes is connected to the spray pipe; the plurality of spray branch pipes are horizontally arranged on the top of the test chamber; and a plurality of spray heads are arranged at the bottom of each of the plurality of spray branch pipes.

[0013] In the present scheme, the design can simulate that the simulated seawater is sprayed from the spray heads at the bottom of the plurality of spray branch pipes, and the sprayed simulated seawater falls in the test chamber, which is similar to the real rainfall process, and the simulation is more realistic.

[0014] Further, a first self-priming pump is arranged on the water inlet main pipe; a first valve and a second valve are respectively arranged on the spray pipe and the water inlet branch pipe.

[0015] In the present scheme, the first valve is closed and the second valve is opened, so that the simulated seawater enters the water inlet chamber; the first valve is opened and the second valve is closed, so that the simulated seawater enters the spray assembly; the design can randomly switch between the two simulation scenes, and the structure is simple and convenient to use.

[0016] Further, the backflow pipeline comprises a backflow pipe, one end of the backflow pipe is connected to the liquid storage tank, and the other end of the backflow pipe is connected to the water inlet chamber; a second self-priming pump is arranged on the backflow pipe.

[0017] Further, the test bin is internally provided with a slope cushion, which is inclined upward from a side close to the filter screen to a side away from the filter screen; and the foundation soil is laid on the slope cushion.

[0018] In the present scheme, when simulating ebb tide, the second self-priming pump transports the simulated seawater inside the water inlet bin to the liquid storage tank through the backflow pipe; the slope cushion is designed to ensure that the simulated seawater infiltrated in the foundation soil can all flow into the water inlet bin and be transported to the liquid storage tank.

[0019] Further, the test bin and the liquid storage tank are further provided with an overflow pipeline; one end of the overflow pipeline is connected to the top of the test bin, and the other end of the overflow pipeline is connected to the liquid storage tank.

[0020] In the present scheme, when the simulated seawater fills the test bin in the test, the excess simulated seawater can overflow to the liquid storage tank through the overflow pipeline, avoiding overflow of the simulated seawater.

[0021] Further, the material of the test bin is acrylic transparent plastic plate.

[0022] In the present scheme, the test bin is a transparent box body, and the change of the pile foundation sample can be directly observed during the experiment, which is convenient to use.

[0023] The beneficial effects of the present application are:

[0024] In the visual test device for simulating the concrete pile foundation in the marine environment provided by the present application, the liquid storage tank and the test bin are arranged, and the spraying assembly is arranged on the top of the test bin, so that the functions of simulating rainfall and tidal circulation are combined; the water delivery pressure is provided by the self-priming pump, the liquid amount and rate reaching the test bin can be controlled by controlling the flow rate of the self-priming pump, the rainfall and tidal circulation under the marine environment are simulated to the maximum, and the durability test and evaluation of the pile foundation sample under the marine environment are realized. The backflow pipeline and the overflow pipeline are arranged, the simulated seawater can flow back to the liquid storage tank, the repeated use of the test waste liquid is realized when simulating the rainfall and tidal circulation, and the waste of resources is prevented. The test bin is designed as a transparent box body, the damage condition of the pile foundation sample in the test process can be observed, so that the macro damage condition can be better analyzed. The overall device has simple structure, convenient assembling method and easy operation, has very wide application range, and has good application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic view of the visual test device for simulating the concrete pile foundation in the marine environment of the present application;

[0026] Figure 2 It is another view structural schematic view of the visual test device for simulating the concrete pile foundation in the marine environment of the present application;

[0027] Figure 3 It is a cross section structure schematic view of the utility model test box.

[0028] Reference signs:

[0029] 1, liquid storage tank; 2, test box; 21, filter screen; 22, water inlet bin; 23, test bin; 24, slope cushion; 31, water inlet main pipe; 32, spray pipe; 33, water inlet branch pipe; 34, spray assembly; 341, spray branch pipe; 342, spray head; 35, first self-priming pump; 36, first valve; 37, second valve; 4, foundation soil; 5, pile foundation sample; 71, second self-priming pump; 72, backflow pipe; 6, overflow pipeline; DETAILED DESCRIPTION

[0030] The utility model will be further described below in combination with the drawings and specific embodiments. The specific embodiments of the utility model are described below so as to facilitate the technical personnel in the art to understand the utility model, but it should be clear that the utility model is not limited to the scope of specific embodiments, and for the ordinary skilled in the art, as long as various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, and all the invention and creation using the concept of the utility model are within the scope of protection.

[0031] Example 1

[0032] As shown in Figure 1 and Figure 2 , the embodiment provides a kind of visual test device for simulating concrete pile foundation in marine environment, the test device can simulate the influence of tidal cycle and rainfall on pile foundation in marine environment, and provide research basis for the durability test of pile foundation;Specifically include:

[0033] Liquid storage tank 1, test box 2, foundation soil 4, water delivery pipeline and backflow pipeline;

[0034] Wherein, test box 2 and liquid storage tank 1 are communicated by water delivery pipeline and backflow pipeline;Liquid storage tank 1 is filled with simulated seawater;Test box 2 is filled with foundation soil 4, and pile foundation sample 5 is buried in foundation soil 4. Simulated seawater is transported to the inside of test box 2 by water delivery pipeline, and the liquid level of simulated seawater in test box 2 rises, to simulate the influence of rising tide process on pile foundation sample 5;Simulated seawater in test box 2 is transported to liquid storage tank 1 by backflow pipeline, to simulate the influence of ebb tide process on pile foundation sample 5.

[0035] The test box 2 is internally provided with a filter screen 21, which divides the internal space of the test box 2 into a water inlet chamber 22 and a test chamber 23; a water supply pipeline is connected to the water inlet chamber 22; and the foundation soil 4 is filled in the test chamber 23. When the filter screen 21 is provided and the simulated seawater is supplied to the test chamber 23, the simulated seawater is first supplied to the water inlet chamber 22 through the water supply pipeline, and then enters the test chamber 23 through the filter screen 21. In this process, the filter screen 21 can slow down the flow of the simulated seawater, so as to avoid the simulated seawater directly scouring the foundation soil 4, thereby avoiding the difference in scouring degree of each pile foundation sample 5 in the test chamber 23, and affecting the test results. On the other hand, the filter screen 21 is also used to block the foundation soil 4, so as to avoid the foundation soil 4 being supplied to the liquid storage tank 1 along with the simulated seawater during the simulated ebb tide process.

[0036] The water supply pipeline comprises a water inlet main pipe 31, one end of the water inlet main pipe 31 being connected to the liquid storage tank 1; the other end of the water inlet main pipe 31 being branched into a spray pipe 32 and a water inlet branch pipe 33, wherein the water inlet branch pipe 33 is communicated with the water inlet chamber 22, and the spray pipe 32 is communicated with a spray assembly 34 arranged on the top of the test box 2. The simulated seawater flows into the water inlet chamber 22 after sequentially flowing through the water inlet main pipe 31 and the water inlet branch pipe 33, and then enters the test chamber 23 from the water inlet chamber 22, thereby simulating the rising tide process; the simulated seawater is sprayed out from the spray assembly 34 after sequentially flowing through the water inlet main pipe 31 and the spray pipe 32, thereby simulating the rainfall process, so as to study the influence of the rainfall scouring on the pile foundation exposed to the ground.

[0037] The spray assembly 34 comprises a plurality of spray branch pipes 341; one end of each of the plurality of spray branch pipes 341 is connected to the spray pipe 32; the plurality of spray branch pipes 341 are horizontally arranged on the top of the test chamber 23; and a plurality of spray heads 342 are arranged at the bottom of each of the plurality of spray branch pipes 341. The simulated seawater can be sprayed out from the spray heads 342 at the bottom of the plurality of spray branch pipes 341, so as to be sprinkled in the test chamber 23, which is similar to the real rainfall process, and the simulation is more realistic.

[0038] A first self-priming pump 35 is arranged on the water inlet main pipe 31; a first valve 36 and a second valve 37 are respectively arranged on the spray pipe 32 and the water inlet branch pipe 33; the first valve 36 is closed and the second valve 37 is opened, so that the simulated seawater enters the water inlet chamber 22; the first valve 36 is opened and the second valve 37 is closed, so that the simulated seawater enters the spray assembly 34. The design can arbitrarily switch between the two simulation scenes, and is convenient to use.

[0039] The backflow pipeline comprises a backflow pipe 72, one end of the backflow pipe 72 being connected to the liquid storage tank 1, and the other end of the backflow pipe 72 being connected to the water inlet chamber 22; and a second self-priming pump 71 is arranged on the backflow pipe 72.

[0040] The test bin 23 is internally provided with a slope pad 24, which is inclined upward from the side close to the filter screen 21 to the side away from the filter screen 21; the foundation soil 4 is laid on the slope pad 24; when simulating the ebb tide, the second self-priming pump 71 transports the simulated seawater in the water inlet bin 22 to the liquid storage tank 1 through the backflow pipe 72; the slope pad is designed to ensure that the simulated seawater infiltrated in the foundation soil 4 can all flow into the water inlet bin 22 and be transported to the liquid storage tank 1.

[0041] The overflow pipe 6 is further arranged between the test bin 2 and the liquid storage tank 1; one end of the overflow pipe 6 is connected to the top of the test bin 2, and the other end of the overflow pipe 6 is connected to the liquid storage tank 1; when the simulated seawater fills the test bin 2 in the test, the excess simulated seawater can overflow to the liquid storage tank 1 through the overflow pipe 6, so as to avoid overflow of the simulated seawater.

[0042] The test bin 2 is a transparent box body made of acrylic transparent plastic plate, and the test is carried out in the transparent box body, so that the change of the pile foundation test sample 5 can be directly observed during the test.

[0043] Embodiment 2

[0044] The embodiment based on the visual test device for simulating the concrete pile foundation in the marine environment provided in Embodiment 1 provides a visual test method for simulating the influence of the tidal cycle on the concrete pile foundation; and specifically includes the following steps:

[0045] Step S1, closing the first valve 36 and the second valve 37.

[0046] Step S2, filling the foundation soil 4 in the test bin 2 and burying the pile foundation test at the corresponding position.

[0047] Step S3, adding a certain amount of simulated seawater in the liquid storage tank 1.

[0048] The preparation method of the simulated seawater is as follows: according to the proportions of sodium chloride (26.726 g / L), magnesium chloride (2.260 g / L), magnesium sulfate (3.248 g / L), calcium chloride (1.153 g / L), sodium bicarbonate (0.198 g / L), potassium chloride (0.721 g / L), sodium bromide (0.058 g / L), boric acid (0.058 g / L), sodium silicate (0.0024 g / L), sodium metasilicate (0.0015 g / L), phosphoric acid (0.002 g / L), di-aluminum hexachloride (0.013 g / L), ammonia (0.002 g / L), and lithium nitrate (0.0013 g / L), the above nutrient salts are dissolved in distilled water; after being fully stirred, it is left to stand; then it is filtered by using a 0.45 μm inorganic filter membrane; then it is sterilized at 110℃ for 30 min; after sterilization, it is cooled to 70℃ and taken out, and then it is naturally cooled.

[0049] Step S4, close the first valve 36 and open the second valve 37, start the first self-priming pump 35; the first self-priming pump 35 pumps the simulated seawater in the liquid storage tank 1 to the test tank 2 at a certain rate, when the water level in the test tank 2 reaches the experimental requirement, the first self-priming pump 35 is closed, and the simulated rising tide condition is simulated.

[0050] Step S5, open the second self-priming pump 71; the second self-priming pump 71 pumps the simulated seawater in the test tank 2 to the liquid storage tank 1 through the return pipe 72, when the water level in the test tank 2 falls to the specified elevation, the second self-priming pump 71 is closed, and the simulated ebb tide condition is simulated.

[0051] Step S6, repeat steps S4 and S5 in a cycle until the designed cycle number is reached, and the tidal cycle under the simulated marine condition is completed.

[0052] Those skilled in the art will appreciate that the embodiments herein are to help the reader understand the principles of the present application and should be understood as the protection scope of the present application is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations according to the technical inspirations disclosed in the present application without departing from the essence of the present application, and these modifications and combinations are still within the protection scope of the present application.

Claims

1. A visualisation testing apparatus to simulate a concrete pile foundation in a marine environment, characterised in that: Including test box (2) and liquid storage tank (1), the test box (2) and the liquid storage tank (1) are communicated by water delivery pipeline and backflow pipeline;The liquid storage tank (1) is filled with simulated seawater;The test box (2) is filled with foundation soil (4), and the pile foundation sample (5) is buried in the foundation soil (4); The test box (2) is provided with a filter screen (21), which divides the space in the test box (2) into a water inlet chamber (22) and a test chamber (23);The water delivery pipeline is connected to the water inlet chamber (22);The foundation soil (4) is filled in the test chamber (23); The water delivery pipeline includes a water inlet main pipe (31), one end of which is connected to the liquid storage tank (1);The other end of the water inlet main pipe (31) is divided into a spray pipe (32) and a water inlet branch pipe (33), wherein the water inlet branch pipe (33) is communicated with the water inlet chamber (22), and the spray pipe (32) is communicated with a spray assembly (34) arranged on the top of the test box (2); The spray assembly (34) includes a plurality of spray branch pipes (341);One end of each of the plurality of spray branch pipes (341) is connected to the spray pipe (32);The plurality of spray branch pipes (341) are horizontally arranged on the top of the test chamber (23), and each of the plurality of spray branch pipes (341) is provided with a plurality of spray heads (342) at the bottom thereof; A first self-priming pump (35) is arranged on the water inlet main pipe (31);A first valve (36) and a second valve (37) are arranged on the spray pipe (32) and the water inlet branch pipe (33) respectively.

2. The visualisation test apparatus of simulated concrete pile foundations in marine environments according to claim 1, characterised in that: The backflow pipeline includes a backflow pipe (72), one end of which is connected to the liquid storage tank (1), and the other end of which is connected to the water inlet chamber (22);A second self-priming pump (71) is arranged on the backflow pipe (72).

3. The visualisation test apparatus of simulated concrete pile foundations in marine environments according to claim 1, characterised in that: A slope pad (24) is arranged in the test chamber (23), and the slope pad (24) is inclined upward from the side close to the filter screen (21) to the side away from the filter screen (21);The foundation soil (4) is laid on the slope pad (24).

4. The visualisation test apparatus of any one of claims 1 to 3, wherein: An overflow pipeline (6) is further arranged between the test box (2) and the liquid storage tank (1);One end of the overflow pipeline (6) is connected to the top of the test box (2), and the other end of the overflow pipeline (6) is connected to the liquid storage tank (1).

5. The visualisation test apparatus for simulated concrete pile foundations in a marine environment according to any one of claims 1 to 3, wherein: The material of the test box (2) is acrylic transparent plastic plate.

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