A full-scale underground multifunctional test loading device

Abstract

The application discloses a full-underground multifunctional full-scale test loading device, and belongs to the technical field of large structure mechanics test, which comprises a control system, an integrated counterforce mechanism, a quick-release waterproof loading mechanism and an auxiliary system.The integrated counterforce mechanism comprises a counterforce wall arranged in a circumferential direction.The quick-release waterproof loading mechanism is arranged in the counterforce wall and is electrically connected with the control system.The auxiliary system is arranged on the inner side of the quick-release waterproof loading mechanism.The device can be used for loading test on large components with various cross-section forms such as shield tunnels, excavated tunnels, pipe galleries and large-diameter pipelines, and can significantly improve the utilization rate of the platform.The integrated counterforce mechanism greatly improves the compressive strength, shear strength and impermeability of the counterforce well wall, increases the underwater test function, and provides a basis for performance upgrading of the loading system in the later period.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of large-scale structural mechanics test, and particularly relates to a full-underground multifunctional full-scale test loading device. BACKGROUND

[0002] With the rapid development of infrastructure construction and the rapid improvement of construction level in China, various large structures are constantly designed and applied in practical engineering. Influenced by different use environments, construction schemes, cost quality and other factors, the optimization design and performance test of large component structures are indispensable. However, the existing research stage mostly uses theoretical calculation, numerical simulation and similar model test methods to realize the optimization design and performance test of the structure. Since the above methods will inevitably change some conditions in the application process, there will be certain deviation in the results. Full-scale test can overcome the shortcomings of the above methods and test the mechanical indexes of the structure in the closest way to the actual application conditions. Therefore, full-scale test has become the best method to verify the mechanical performance of the structure.

[0003] The existing full-scale test loading device is mostly used for shield segment loading test. For example, the counter-pulling type: by arranging counter-pulling beams and counter-pulling anchor cables, a jack is used to apply tension to the counter-pulling anchor cable installed on the counter-pulling beam, and the reaction force of the counter-pulling beam is used to apply radial pressure to the shield tunnel structure to simulate the effect of soil pressure on the tunnel structure; the hoop type: by arranging hoop beams and multiple groups of hoop anchor cables, a jack is used to apply tension to the counter-pulling anchor cable installed on the counter-pulling beam, and the contact pressure of the hoop anchor cable on the outer surface of the shield tunnel structure is used to introduce axial force to the structure to simulate the effect of water pressure on the tunnel structure; the ring frame type: by providing support reaction force through a reaction frame, a jack is used to simulate the effect of water and soil pressure on the tunnel structure.

[0004] The above scheme can realize full-scale test loading of the segment, but still has the following obvious deficiencies:

[0005] (1) The test object is single, and only the loading test of the shield segment can be met, and the platform utilization rate is low;

[0006] (2) The triggering threshold of stopping loading after the system limit loading is uncontrollable, and the test process is dangerous;

[0007] (3) The loading value needs to be manually inputted, and cannot be adjusted in real time, so the loading precision is low;

[0008] (4) The control system has low degree of customization, and it is difficult to meet the loading scheme of different test pieces;

[0009] (5) No waterproof design is made, and the test with water cannot be carried out. SUMMARY

[0010] The invention aims to provide a full-underground multifunctional full-scale test loading device to solve the problems in the prior art.

[0011] To achieve the above-mentioned purpose, the invention provides the following solutions: the invention provides a full-underground multifunctional full-scale test loading device, comprising:

[0012] a control system;

[0013] an integrated counterforce mechanism, comprising a circumferentially arranged counterforce wall;

[0014] a quick-release waterproof loading mechanism arranged in the counterforce wall and electrically connected with the control system;

[0015] an auxiliary system arranged inside the quick-release waterproof loading mechanism.

[0016] Preferably, the counterforce wall is made of a counterforce frame and concrete.

[0017] Preferably, the counterforce wall is provided with a waterproof strip.

[0018] Preferably, the quick-release waterproof loading mechanism comprises a plurality of equally spaced jacks fixed to the inner wall of the counterforce wall, the jacks are provided with waterproof members, one side of the jacks close to the counterforce wall is provided with a jack base, the jack base is fixed to the counterforce wall, one side of the jacks away from the jack base is provided with a jack cover plate, one side of the jack cover plate away from the jacks is provided with a servo loading head, and the servo loading head is adapted to the auxiliary system.

[0019] Preferably, one side of the jacks close to the jack base is provided with an oil pressure connection end.

[0020] Preferably, sensors are symmetrically installed on both sides of the servo loading head.

[0021] Preferably, the auxiliary system comprises a load uniform distribution structure and a rolling bearing support, and the bottom of the load uniform distribution structure is connected with four universal wheels through bolts.

[0022] The application discloses the following technical effects: the device can perform loading tests on large components with various cross-sectional forms such as shield tunnels, excavated tunnels, pipe galleries and large-diameter pipelines, and significantly improves platform utilization. The control system of the application can be designed systematically and parameterized by a user according to a specific test type, has the functions of automatic calculation, distribution and correction of loads, and ensures that the test load accuracy is not lower than 90%; a test operator can independently set a damage threshold according to a test purpose, and test safety is ensured; a test data analysis system provides a multi-channel interface, can collect various test data in real time, and automatically displays abnormal data. The integrated counterforce mechanism greatly improves the compressive strength, shear strength and impermeability of the counterforce well wall, increases underwater test functions, and also provides a basis for performance upgrading of a later loading system. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings constituting a part of the application are used to provide further understanding of the application, the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitations on the application. In the drawings:

[0024] Figure 1 It is a top view of the full-underground multifunctional full-scale test loading device of the application;

[0025] Figure 2 It is a side view of the full-underground multifunctional full-scale test loading device of the application;

[0026] Figure 3 It is a structural schematic view of the integrated counterforce mechanism of the application;

[0027] Figure 4 It is a structural schematic view of the quick-release waterproof loading mechanism of the application;

[0028] Figure 5 It is a structural schematic view of the auxiliary system load uniform distribution structure of the application;

[0029] Figure 6 It is a structural schematic view of the auxiliary system rolling bearing support of the application;

[0030] Figure 7 It is a structural schematic view of the auxiliary system self-sealing liquid seal annular support of the application.

[0031] In the figure: 1, control system; 2, quick-release waterproof loading mechanism; 3, integrated counterforce mechanism; 4, auxiliary system; 21, waterproof part; 22, jack cover plate; 23, servo loading head; 24, sensor; 25, jack base; 26, oil pressure connection end; 31, counterforce frame; 32, waterproof strip; 33, counterforce wall; 41, load uniform distribution structure; 42, rolling bearing support; 43, self-sealing liquid ring support; 44, prefabricated groove; 45, universal wheel; 46, rolling bearing; 47, manual hydraulic jack; 48, steel plate; 49, water stop strip / belt. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0034] Reference Figures 1-7 As shown in the figure, the present embodiment provides a full-underground multifunctional full-scale test loading device, which comprises:

[0035] a control system 1;

[0036] an integrated counterforce mechanism 3, the integrated counterforce mechanism 3 comprising a circumferentially arranged counterforce wall 33;

[0037] a quick-release waterproof loading mechanism 2 arranged in the counterforce wall 33 and electrically connected with the control system 1;

[0038] an auxiliary system 4 arranged on the inner side of the quick-release waterproof loading mechanism 2.

[0039] The device can perform loading tests on various cross-section forms of large components such as shield tunnels, underground tunnels, pipe galleries and large-diameter pipelines, and significantly improves the platform utilization rate. The control system 1 of the present application can be designed by the user according to the specific test type, has the functions of automatic calculation, distribution and correction of load, and ensures that the test load accuracy is not less than 90%; the test personnel can independently set the failure threshold according to the test purpose to ensure test safety; the test data analysis system provides a multi-channel interface, can collect various test data in real time, and automatically displays abnormal data. The integrated counterforce mechanism 3 greatly improves the compressive strength, shear strength and impermeability of the counterforce well wall, increases the underwater test function, and also provides a basis for upgrading the performance of the loading system later.

[0040] Further optimization scheme, counterforce wall 33 is made of counterforce frame 31 and concrete.

[0041] Further optimization scheme, waterproof strip 32 is arranged in counterforce wall 33.

[0042] The entire counterforce mechanism is circular with a diameter of 10 m, adopts a sunken design, and the counterforce wall 33 is integrally poured by the counterforce frame 31 and C50 concrete, and two waterproof strips 32 are arranged inside to ensure that the counterforce well wall will not be deformed or damaged during the test. The integrated counterforce mechanism 3 is provided with 24 loading points, each point is provided with a plurality of equidistant fixed bolts, a plurality of jacks can be installed, the jacks have a horizontal height adjustment function, and the maximum has a 24-point asymmetric loading capacity.

[0043] Further optimization scheme, quick-release waterproof loading mechanism 2 includes a plurality of equidistant jacks fixed in the inner wall of counterforce wall 33, waterproof part 21 is arranged on the jack, jack base 25 is arranged on the side of the jack close to counterforce wall 33, jack base 25 is fixed to counterforce wall 33, jack cover plate 22 is arranged on the side of the jack away from the jack base 25, servo loading head 23 is arranged on the side of the jack cover plate 22 away from the jack, and servo loading head 23 is matched with auxiliary system 4.

[0044] Further optimization scheme, the side of the jack close to the jack base 25 is provided with an oil pressure connection end 26.

[0045] Further optimization scheme, sensors 24 are symmetrically installed on both sides of the servo loading head 23.

[0046] Quick-release waterproof loading mechanism 2 is composed of a plurality of double-acting large-tonnage jacks, the jacks are imported and customized, have good waterproof performance, can meet the requirements of underwater work, and the loading system is connected with the servo oil source control cabinet and acts according to the control signal.

[0047] Figure 3 The connection form of the jack servo loading head and the auxiliary system in the actual test process is mainly to prevent the risk of the jack and the auxiliary system being separated in the test process. In the actual test, after the test piece and the auxiliary system are positioned, there is a small distance between the test piece and the auxiliary system and the jack, which is to ensure that the test piece is placed smoothly. After the test piece and the auxiliary system are positioned, the jack is adjusted through the system to realize the connection of the jack servo loading head and the auxiliary system.

[0048] The control system 1 is composed of a control console and two integrated servo oil source control cabinets. The control console is embedded with a self-defined control system 1, which has a load calculation, distribution and correction subsystem, a damage threshold correction subsystem and a test data analysis system. The load calculation, distribution and correction subsystem has automatic load calculation, automatic distribution and automatic correction, ensuring that the test load accuracy is not less than 90%. The damage threshold correction subsystem allows the tester to set the damage threshold according to the test purpose, ensuring test safety. The test data analysis system provides a multi-channel interface, which can collect various test data in real time and automatically display abnormal data. The tester can quickly customize and prepare the control system 1 according to the specific test scheme, and the integrated servo oil source control cabinet is connected to the control console through signals.

[0049] Further optimization scheme, auxiliary system 4 includes load uniform distribution structure 41, rolling bearing support 42, self-sealing ring support 43, load uniform distribution structure 41 bottom through bolt connection 4 universal wheel 45, make load uniform distribution structure can move with test piece; Rolling bearing 46 in rolling bearing support 42 can greatly reduce the friction generated by the movement of test piece, reduce test error.

[0050] Further, the test piece support assembly in auxiliary system 4 provides two forms, one is rolling bearing support 42, corresponding to the loading point, a total of 24 rolling bearing supports 42 are prepared, and manual hydraulic jack 47 is built-in rolling bearing support 42 to adjust the height of the support, meet the requirements of different test piece angles. The other is self-sealing ring support 43, which is composed of three layers of structure, the bottom is water stop strip / belt 49, and the upper part is composed of two layers of steel plate 48, which is filled with explosion-proof sealing oil between the steel plates 48, which plays a role in reducing friction and sealing. The support can be used for water test.

[0051] Further, the load uniform distribution structure 41 in auxiliary system 4 adopts multi-section design, the sections are connected by bolts, the front of the distribution assembly is designed with prefabricated groove 44, the top of manual hydraulic jack 47 is connected thereto, and the back is in close contact with the test piece.

[0052] A full-underground multifunctional full-scale test loading device, the specific use steps are as follows:

[0053] 1) Test scheme: prepare test scheme, which specifically includes test piece type and loading scheme, etc., to facilitate the setting of control system 1 and quick-release waterproof loading mechanism 2 and the placement of test piece;

[0054] 2) Test piece, quick-release waterproof loading mechanism 2 and auxiliary system 4 placement: according to the test scheme, mark the position on the ground of the sinking counterforce well, determine the position of the test piece and the support, use the crown block to place the test piece and the support at the specified position, then adjust the height to the scheme setting, install and adjust the quick-release waterproof loading mechanism 2, the number, angle and height of the jacks can be placed by using the jack support assembly;

[0055] 3) Pre-embedded or arranged data acquisition instrument: data acquisition equipment needs to be arranged on the test piece before the test starts. For large concrete members, common data acquisition instruments include steel stress strain gauges, externally attached strain gauges, concrete strain sensors 24, various displacement meters, etc. The data acquisition instrument is arranged according to the test scheme, and the other end is connected to the console;

[0056] 4) Control system 1 self-defined setting: set the control module and parameters according to the test scheme, such as loading accuracy, loading speed, peak failure strength judgment, etc. At the same time, the user can choose whether to embed the data acquisition system into the servo loading system;

[0057] 5) Test loading and data acquisition: start loading according to the test scheme. If the data acquisition system has been embedded in the control system 1, directly select start loading. The system will automatically store various test data. If it is not embedded, the user needs to start data acquisition by himself.

[0058] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0059] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A full-underground multifunctional full-scale test loading device, characterized by: The utility model relates to a kind of test equipment for testing the bearing capacity of test piece, including Control system (1); Integrated counterforce mechanism (3), the integrated counterforce mechanism (3) includes circumferential arrangement of counterforce wall (33); Quick-release waterproof loading mechanism (2) is arranged in the counterforce wall (33), and is electrically connected with the control system (1); Auxiliary system (4) is arranged in the inside of quick-release waterproof loading mechanism (2); The quick-release waterproof loading mechanism (2) includes multiple equally spaced jack fixed in the inner wall of the counterforce wall (33), waterproof piece (21) is provided on the jack, jack base (25) is provided on the side of the jack close to the counterforce wall (33), the jack base (25) is fixed with the counterforce wall (33), jack cover plate (22) is provided on the side of the jack away from the jack base (25), servo loading head (23) is provided on the side of the jack cover plate (22) away from the jack, the servo loading head (23) is adapted with the auxiliary system (4); The side of the jack close to the jack base (25) is provided with oil pressure connection end (26); Sensor (24) is symmetrically installed on the two sides of the servo loading head (23); The auxiliary system (4) includes load uniform distribution structure (41), rolling bearing support (42) and self-sealing liquid seal annular support (43), the bottom of load uniform distribution structure (41) is bolted with four universal wheels (45), so that load uniform distribution structure (41) can move with test piece;The rolling bearing (46) in the rolling bearing support (42) is used to reduce the friction generated by the movement of the test piece, the rolling bearing support (42) corresponds to the loading point, the rolling bearing support (42) is built-in manual hydraulic jack (47) to adjust the height of the rolling bearing support (42), to meet the requirements of different test piece angles;Self-sealing liquid seal annular support (43) is composed of three layers of structure, the bottom is water stop or water stop tape (49), the upper part is composed of two layers of steel plate (48), the two layers of steel plate (48) are filled with explosion-proof sealing oil, to reduce friction and sealing, the self-sealing liquid seal annular support (43) is used for water test; Load uniform distribution structure (41) adopts multi-section design, section and section are connected by bolt, load uniform distribution structure (41) is provided with prefabricated groove (44) in front, the prefabricated groove (44) is connected with servo loading head (23), and the back of load uniform distribution structure (41) is closely attached to test piece.

2. The all-underground multifunctional full-scale test loading device according to claim 1, characterized in that: The counterforce wall (33) is made of counterforce frame (31) and concrete.

3. The all-underground multifunctional full-scale test loading device according to claim 1, characterized in that: Waterproof strip (32) is arranged in the counterforce wall (33).

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