CN207215622U - A kind of Blade fence, which moves in circles, acts on load testing machine - Google Patents

Abstract

The utility model belongs to load test technical field, is related to a kind of Blade fence and moves in circles effect load testing machine and method, and hold-down support is arranged on the top of cylindrical model case, and actuator is horizontally arranged on hold-down support；Connecting rod is connected by fixed hoop with actuator, and connecting rod is fixed on Blade fence model middle, and Blade fence model is placed in cylindrical model case；Servomotor is connected with actuator, pull pressure sensor and displacement transducer are separately mounted in actuator, pull pressure sensor and displacement transducer are connected to form data acquisition and analysis system with computer again after being connected respectively with controller, controller drives actuator to apply cyclic load to Blade fence model with constant rate of speed or constant force during load applies, the horizontal cyclic Cyclic Loading of Practical Project is simulated, forms horizontal cyclic Cyclic Loading loading system；Its is simple in construction, easy to operate, and test data is accurate.

Description

A suction barrel foundation cyclic reciprocating action loading test device

technical field

The utility model belongs to the technical field of loading tests, and relates to a loading test device for a suction barrel-shaped foundation in marine engineering, in particular to a loading test device for a suction-type barrel-shaped foundation with cyclic reciprocating action.

Background technique

With the rapid development of science and technology and the limitation of land resources, people pay more attention to the development and utilization of marine resources, and the status of marine engineering in national economic construction is increasing day by day. The construction of ocean ports and bridge projects has also changed from shallow sea and miniaturization to deep sea, large-scale and complex development. At the same time, the harsh and changeable marine climate, the severe impact of seawater circulation, and the complex and diverse marine geological environment all have an important impact on the stability and safety of marine structures. In this case, the suction barrel foundation emerged as a new type of foundation for offshore platform structures, and has been widely used and promoted. The suction bucket foundation utilizes negative pressure to achieve penetration, which has the advantages of simple construction, reusability, and low cost. In actual engineering, the suction barrel foundation mainly bears the horizontal load generated by the wave action, the self-weight load generated by the upper structure and the pull-out load generated by the buoyancy of sea water. These cyclic loads cause lateral circulation failure to the suction barrel foundation At the same time, the generation of soil plugs during the penetration process of the suction barrel foundation will also have a certain impact on its bearing capacity characteristics, making the force of the suction barrel foundation in the horizontal direction more complicated, so the normal service state Under these circumstances, the cyclic bearing capacity characteristics of the suction bucket foundation have an important influence on its stability. At present, there are few research materials on the bearing characteristics of suction barrel foundations under multiple cyclic loads. Most of the existing research focuses on the vertical bearing characteristics and theoretical analysis, and there is a lack of corresponding testing equipment and methods. The research on the bearing characteristics of the suction bucket foundation under cyclic loads is of great significance to the research on the bearing characteristics of the suction bucket foundation during the service period. It provides a good theoretical basis for the construction, design and later protection of the suction barrel foundation of marine structures. Therefore, it is urgent to design a test device and test method for cyclic reciprocating action of suction barrel foundation.

Contents of the invention

The purpose of the invention of this utility model is to overcome the shortcomings of the prior art, and to design and provide a loading test device for the research of the bearing behavior of the suction bucket foundation under the action of horizontal cyclic reciprocating load under the premise of simulating the actual working conditions as much as possible. The device controls the actuator by a servo motor to apply horizontal loads of different sizes and frequencies to simulate wave loads, and completes the test of the horizontal bearing properties of the suction bucket foundation under the action of horizontal cyclic reciprocating loads.

In order to achieve the above object, the main structure of the suction barrel foundation cyclical reciprocating action loading test device described in the utility model includes a cylindrical model box, a fixed support, a suction barrel foundation model, a connecting rod, a fixing hoop, a working Actuator, pull pressure sensor, displacement sensor, servo motor, controller and computer; the cylindrical model box is composed of upper and lower parts, the height of the upper and lower parts is 30cm and 70cm respectively, and the fixed support is installed on the circular On the upper part of the cylindrical model box, the actuator is installed horizontally on the fixed support; the connecting rod is connected with the actuator through a fixed hoop, which is convenient for the suction barrel-shaped basic model to perform reciprocating and cyclical movement together with the actuator; the connecting rod is fixed In the middle of the suction barrel foundation model, the suction barrel foundation model is placed in a cylindrical model box; the servo motor is connected to the actuator, and the servo motor controls the actuator to simulate different frequencies with a constant strain rate or constant stress The horizontal cyclic reciprocating load; the tension pressure sensor and the displacement sensor are installed on the actuator respectively, the tension pressure sensor is used to test the cyclic load of the suction bucket foundation model, and the displacement sensor measures the suction bucket foundation during the load application process The horizontal displacement of the model changes, and the relationship curve between the cyclic load and the displacement and time is obtained by recording the load application time, so as to obtain the bearing behavior of the suction barrel foundation under different horizontal loads and frequencies; tension pressure sensor and displacement sensor They are respectively connected to the controller and then connected to the computer to form a data acquisition and analysis system. During the load application process, the controller drives the actuator to apply cyclic load to the suction bucket foundation model at a constant rate or constant force, simulating the horizontal cycle of the actual project. load, forming a horizontal cyclic reciprocating load loading system.

The horizontal cyclic reciprocating load loading system and the data acquisition and analysis system of the utility model rely on the actuator to apply the horizontal cyclic reciprocating load, and record the horizontal cyclic displacement change of the suction barrel-shaped foundation model under the action of the horizontal cyclic reciprocating load through the displacement sensor. The pressure sensor records the load of the suction bucket foundation model under the action of cyclic load; after the loading starts, the computer records the lateral horizontal displacement of the suction bucket foundation model, the magnitude of the horizontal cyclic load and the loading time, and obtains the cyclic load - Displacement relationship curve.

The specific process of the utility model to realize the cyclical reciprocating action loading test of the suction barrel foundation is as follows:

(1) Make a cylindrical model box, clean up the bottom and side walls of the cylindrical model box with a brush to prevent residues from affecting the test results in the cylindrical model box; Draw the scale line to facilitate the application of filler in the cylinder;

(2) Place the suction barrel-shaped foundation model in the middle of the cylindrical model box, and apply suction to complete sinking; after sinking, install the connecting rod, use the fixing ring to connect the connecting rod with the actuator, and then connect Servo motor, connect the displacement sensor, tension pressure sensor with the controller and computer to form a data acquisition and analysis system, and test whether the data acquisition and analysis system is intact;

(3) Set the constant strain value or constant force value on the computer, apply horizontal tension and compression loads to the suction barrel foundation model through the actuator, and simulate the suction barrel foundation under the action of horizontal cyclic reciprocating load in actual engineering The load-displacement relationship curve of the suction bucket foundation under the action of horizontal cyclic load is obtained;

(4) Change the constant strain value or applied constant force value and repeat the above operations to obtain the load-displacement relationship curve of the suction bucket foundation model under different sizes and frequency loads, and realize the suction bucket foundation under cyclic loads Simulation and testing of load-carrying characteristics.

Compared with the prior art, the utility model has the advantages of simple structure, convenient operation and accurate test data. By recording the load application time, the relationship curve between the reciprocating load and displacement and time can be obtained, and then the load size of the suction barrel foundation at different levels can be obtained. It provides a theoretical basis for the design of suction bucket foundations under wave loads and different frequency drag forces in engineering practice.

Description of drawings:

Fig. 1 is a cross-sectional view of the loading test device for the suction barrel-shaped foundation of the utility model according to the cyclic reciprocating action.

Fig. 2 is a top view of the loading test device for the suction barrel foundation of the utility model according to the reciprocating action.

Fig. 3 is a schematic diagram of the structural principle of the data acquisition and analysis system described in the present invention.

Fig. 4 is a curve diagram of the cyclic load-displacement relationship described in the embodiment of the present invention.

Detailed ways:

The utility model will be described in further detail below through the embodiments in conjunction with the accompanying drawings.

Example:

The main structure of the suction barrel foundation cyclic reciprocating action loading test device described in this embodiment includes a cylindrical model box 1, a fixed support 2, a suction barrel foundation model 3, a connecting rod 4, a fixed hoop 5, a Actuator 6, pull pressure sensor 7, displacement sensor 8, servo motor 9, controller 10 and computer 11; Cylindrical model box 1 is made up of upper and lower two parts, and the height of upper and lower two parts is 30cm and 70cm respectively , the fixed support 2 is installed on the upper part of the cylindrical model box 1, and the actuator 6 is horizontally installed on the fixed support 2; the connecting rod 4 is connected with the actuator 6 through the fixed hoop 5, which is convenient for the suction barrel foundation The model 3 performs reciprocating and cyclical motion together with the actuator 6; the connecting rod 4 is fixed in the middle of the suction barrel-shaped basic model 3, and the suction barrel-shaped basic model 3 is placed in the cylindrical model box 1; the servo motor 9 and the working Connected to the actuator 6, the servo motor 9 controls the actuator 6 to simulate the horizontal reciprocating load of different frequencies with a constant strain rate or constant stress; the tension pressure sensor 7 and the displacement sensor 8 are respectively installed on the actuator 6, and the tension pressure sensor 7 is used to test the size of the cyclic load on the suction bucket foundation model 3. The displacement sensor 8 measures the horizontal displacement change of the suction bucket foundation model 3 during the load application process, and obtains the cyclic load and displacement and Time relationship curve, so as to obtain the bearing properties of the suction bucket foundation under the action of different horizontal loads and frequencies; the tension pressure sensor 7 and the displacement sensor 8 are respectively connected to the controller 10 and then connected to the computer 11 to form a data acquisition and analysis system , during the load application process, the controller 10 drives the actuator 6 to apply a cyclic load to the suction bucket foundation model 3 at a constant rate or constant force, simulating the horizontal cyclic load of an actual project, and forming a horizontal cyclic load loading system.

In this embodiment, the specific process of realizing the cyclic reciprocating action loading test of the suction bucket foundation is as follows:

(1) make the cylindrical model box 1, clean up the bottom and the side wall of the cylindrical model box 1 with a brush, to prevent residues from having an impact on the test results in the cylindrical model box 1; 1 The scale line is drawn along the depth inside to facilitate the application of filler in the cylinder;

(2) Place the suction-type barrel-shaped basic model 3 in the middle of the cylindrical model box 1, and apply suction to complete the sinking; after sinking, install the connecting rod 4, and use the fixing ring 5 to connect the connecting rod 4 and the actuator 6 connection, then connect the servo motor 9, connect the displacement sensor 8, the tension pressure sensor 7 with the controller 10, and the computer 11 to form a data acquisition and analysis system, and test whether the data acquisition and analysis system is intact;

(3) Set a certain constant strain value or constant force value (such as 16N) on the computer 11, and apply a horizontal pull with a certain frequency (such as 0.1Hz, 1000 cycles) to the suction barrel-shaped foundation model 3 through the actuator 6. Compressive load, to simulate the force situation of the suction barrel foundation under the action of horizontal cyclic reciprocating load in engineering practice, and obtain the load-displacement relationship curve of the suction barrel foundation under the action of horizontal cyclic load;

(4) Change the constant strain value or the applied constant force value and repeat the above operations to obtain the load-displacement relationship curve of the suction bucket foundation model 3 under loads of different sizes and frequencies, and realize the suction bucket foundation model 3 under cyclic loads. The simulation and test of the load-bearing characteristics of the foundation, Figure 4 shows the displacement-load curve of 1000 cycles with a constant load of 8.5N.

Claims (1)

1. The effect load testing machine 1. a kind of Blade fence moves in circles, it is characterised in that agent structure includes cylindrical shape Model casing, hold-down support, Blade fence model, connecting rod, fixed hoop, actuator, pull pressure sensor, displacement pass Sensor, servomotor, controller and computer；Cylindrical model case is made up of upper and lower two parts, upper and lower two-part height Respectively 30cm and 70cm, hold-down support are arranged on the top of cylindrical model case, and actuator is horizontally arranged on hold-down support； Connecting rod is connected by fixed hoop with actuator, and connecting rod is fixed on Blade fence model middle, suction type bucket Shape basic model is placed in cylindrical model case；Servomotor is connected with actuator, pull pressure sensor and displacement transducer point An Zhuan not be in actuator, pull pressure sensor and displacement transducer are connected to form with computer again after being connected respectively with controller Data acquisition and analysis system.