CN204645105U - A kind of real-time monitoring device for pile works local scour test - Google Patents

Abstract

The utility model provides a real-time monitoring device for local scour test of pile structures, which comprises a cylinder, a test soil layer and a test water layer, the test water layer is located above the test soil layer, and the lower part of the cylinder is buried in the test In the soil layer, the surrounding wall of the cylinder is transparent and the bottom is sealed. The height of the cylinder buried in the test soil layer is not less than twice the outer diameter of the cylinder. The upper end of the cylinder protrudes from the test water layer. The real-time monitoring device also Including the camera, the camera is placed in the inner space of the transparent cylinder through the bracket, and the camera data is connected to the external processing unit. The test and data collection of the utility model adopts non-contact means, does not destroy the topography, and is simple, convenient and easy to operate.

Description

A real-time monitoring device for local scour test of pile structures

technical field

The utility model relates to a monitoring device for local scour tests around a cylinder.

Background technique

In the marine environment, the development process of scour pits around pile structures is very complicated, and its shape (depth and range) is affected by the coupling of many factors, such as water depth, wave and current conditions, structure shape and geometric size, etc. This poses a great challenge to accurately predict the local scour of bridge foundations under complex marine environmental conditions. At present, there are mainly the following evaluation methods for on-site foundation scour problems: ① based on existing empirical theoretical formulas; ② long-term tests of on-site scour pits; ③ numerical simulation calculations through CFD; ④ indoor tank scale test. Among them, in the indoor water tank test, the on-site hydrodynamic conditions, structure size, and bed conditions are scaled down according to a certain similarity rate, and the development process of the on-site scour pit is simulated with a relatively small size, and the shape of the scour pit in the test tank is obtained through the test. , and finally the size of the scour pit is obtained through the reduction of the scale relationship, and a quantitative assessment of the scour of the marine foundation is made. The development of local scour pits is a dynamic and complex process, so long-term real-time monitoring is required to obtain the evolution process of seabed topography, which is an important basis for research to reveal the long-term scour mechanism of ocean foundations under complex hydrodynamic conditions. At present, in the indoor water tank test, the underwater test is mainly carried out by ultrasonic or laser rangefinder and other equipment, which has high precision, but also has the disadvantages of high price and the probe protruding into the water surface to interfere with the flow field.

Contents of the invention

The technical problem to be solved by the utility model is: Aiming at the problems existing in the prior art, a real-time monitoring device for local scouring tests of pile structures is proposed, which can realize real-time monitoring of the depth and range of scouring pits around piles, non-contact It is simple, convenient, easy to operate, easy to promote and so on.

The technical solution adopted by the utility model to solve the technical problem is: a real-time monitoring device for the local scour test of the pile structure, including a cylinder for simulating the pile structure, and a test soil layer for simulating the underwater environment and the test water layer, the test water layer is located above the test soil layer, the lower part of the cylinder is buried in the test soil layer, the peripheral wall of the cylinder is transparent and the bottom is sealed, and the cylinder is buried The height inserted into the test soil layer is not less than 2 times the outer diameter of the cylinder, and the upper end of the cylinder protrudes from the test water layer. The real-time monitoring device also includes a camera, and the camera is captured by the support through the bracket. Placed in the inner space of the transparent cylinder, the horizontal position of the camera is lower than the horizontal plane of the test water layer, the lens of the camera is vertically downward, and the mirror surface is horizontal, and the lens center of the camera is in line with the The center of the bottom of the cylinder is aligned in the vertical direction, and the camera data is connected to an external processing unit.

While adopting the above-mentioned technical solution, the utility model can also adopt or adopt the following further technical solutions in combination:

The transparent cylinder is a plexiglass bucket, the wall thickness of the plexiglass bucket is 1.5-3mm, and the bottom thickness is 2-5mm.

The outer surface of the plexiglass bucket is provided with graduation marks.

A retractable device is connected to the support of the camera, and the camera can move inside the cylinder under the drive of the retractable device.

The external processing unit is a computer or other photo processing device capable of processing photo data.

The beneficial effects of the utility model are: the utility model proposes a new real-time monitoring device for the development of local scour pits around the cylinder, the cylinder is a transparent plexiglass barrel with a sealed bottom, and the camera placed inside can clearly record the scour pit depth boundary ( The change of the contact line between the outer wall of the cylinder and the sand bed) and the development and changes of the outer boundary of the scour pit (the range of the scour pit) can be monitored in real time and digitized for the depth of the scour pit around the pile and the width of the scour pit. Through this device, you can obtain: 1 1. The change of the depth boundary of the scour pit at any time during the test and the change of the outer boundary of the scour pit; 2. The change of the depth and range of the scour pit in any direction during the test; 3. The average depth of the scour pit during the whole experiment The change curve and the change of the outer boundary of the scour pit over time, through the above changes, corresponding data analysis can be carried out to provide valuable reference for actual production applications. The test and data collection of the utility model adopts non-contact means, does not destroy the topography, and is simple, convenient and easy to operate.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model.

Detailed ways

Refer to attached picture.

The real-time monitoring device of the present utility model comprises a cylinder 1 for simulating pile structures, a test soil layer 2 and a test water layer 3 for simulating the underwater environment, the peripheral wall of the cylinder 1 is transparent and the bottom is sealed, and the cylinder 1 The lower part of the cylinder is buried in the test soil layer 2. In order to ensure the stability of the cylinder 1, the height of the cylinder 1 buried in the test soil layer 2 is not less than twice the outer diameter of the cylinder. The upper end of the cylinder 1 extends In order to test the water layer 1, water is prevented from entering the interior of the cylinder, so that the interior of the cylinder 1 is not impacted by water, and the test effect is guaranteed.

The real-time monitoring device also includes a camera 4. The camera 4 is placed in the inner space of the cylinder 1 by a support 5. The function of the camera 4 is to collect the depth and width changes of the scour pit. The camera lens of the camera 4 is vertically downward, and the mirror surface It is in a horizontal position, and the lens center of the camera 4 is vertically aligned with the center of the cylinder bottom to ensure that the collection point is in the middle and the collection position is unbiased. The camera 4 is connected to the external processing unit through a data line, and the external processing unit can be a PC Computer, through the PC, collect and process the collected photos. Commonly used image processing tools can be used for photo processing to ensure that the angle of each photo is the same, so as to analyze the results.

In order to avoid the impact of water refraction on camera acquisition, the horizontal position of camera 2 should be lower than the level of test water layer 1.

The transparent cylinder 1 is a plexiglass barrel. In order to ensure the strength of the cylinder 1 and better simulate the real environment of scouring, the wall of the plexiglass barrel should have a certain thickness. On the other hand, in order to ensure the accuracy of camera acquisition, The plexiglass barrel should not be too thick, otherwise the refraction of the glass will have a great impact on the camera's shooting, so the wall thickness of the plexiglass barrel should be set between 1.5-3mm, preferably 2mm. At the same time, the material of the plexiglass has a certain The rebound force is similar to that of the submarine columnar structure. The thickness of the bottom of the plexiglass barrel is 2-5mm, preferably 3mm. The bottom should not be too thick. On the basis of ensuring its strength, the bottom should be as thin as possible to avoid excessive refraction and affect the shooting effect of the camera.

The outer surface of the plexiglass bucket is provided with a scale line. Before the test, the depth and width of the scour pit need to be calibrated based on the scale line. After the test, the corresponding calculations are performed on the collected pictures according to the scale line.

The bracket 5 of the camera 4 is connected with a retractable device, and the camera can move inside the cylinder 1 under the drive of the retractable device, thereby adjusting the position of the camera 4, so as to select the best shooting angle, as the collection position, the retractable The device can take the form of a screw or the like.

Claims (5)

1. the real-time monitoring device for pile works local scour test, comprise the cylinder for simulating pile works, for test soil layer and the test water layer in Simulated Water base ring border, described test water layer is positioned at the top of described test soil layer, described cylindrical bottom is embedded in test soil layer, it is characterized in that: the transparent and sealed bottom of described cylindrical perisporium, the described cylinder height be embedded in described test soil layer is not less than 2 times of described cylinder external diameter, described cylindrical upper end stretches out in described test water layer, described real-time monitoring device also comprises camera, described camera is placed in the inner space of described transparent cylinder by support, the horizontal level of described camera is lower than the horizontal plane of described test water layer, the camera lens of described camera straight down, minute surface level, align with described cylinder bottom center in the vertical direction in the optical center of described camera, described camera data connects external processing unit.

2. as claimed in claim 1 a kind of for the local scour of pile works test real-time monitoring device, it is characterized in that: described transparent cylinder is organic glass bucket, the bucket wall thickness of described organic glass bucket is 1.5-3mm, and its bottom thickness is 2-5mm.

3. as claimed in claim 2 a kind of for the local scour of pile works test real-time monitoring device, it is characterized in that: the external surface of described organic glass bucket is provided with graduation mark.

4. as claimed in claim 1 a kind of for the local scour of pile works test real-time monitoring device, it is characterized in that: the support of described camera is connected with telescopic mounting, described phase function is mobile in described cylinder inside under the driving of described telescopic mounting.

5. as claimed in claim 1 a kind of for the local scour of pile works test real-time monitoring device, it is characterized in that: described external processing unit is computer or other picture processing devices, can carry out the data processing of photo.