An apparatus for testing the durability of an underground structure

Abstract

The application discloses a kind of underground structure durability test device, including first clamping plate and second clamping plate, second clamping plate is located in the side of first clamping plate along axial direction, and second clamping plate is slidably arranged along axial direction;During test, first clamping plate and second clamping plate are used to clamp and fix underground structure between them;Second clamping plate is provided with elastic member on the side away from first clamping plate, and elastic member is arranged parallel to axial direction;The side of elastic member away from second clamping plate is abutted with support plate, and support plate is driven by driving assembly and moves along axial direction towards second clamping plate;Support plate has test state locked by first locking member, and when support plate is in test state, elastic member is in compressed force-accumulating state, and support plate cannot move in the direction away from second clamping plate.The application more accurately simulates the stress condition of underground structure in actual engineering, and improves the accuracy of durability test result of underground structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical test of reinforced concrete structure member, in particular to a durability test device for underground structure. BACKGROUND

[0002] The underground structure is a necessary structure in the field of civil construction underground engineering. In actual civil construction concrete engineering, the underground structure such as comprehensive pipe gallery, subway station, shield tunnel and tunnel segment is subjected to the combined action of eccentric load caused by surrounding soil and unilateral erosion environment of outside soil for a long time. With the passage of time, the underground structure will gradually deteriorate. The durability of the underground structure determines the service life of the concrete engineering. Therefore, the evaluation of the durability of the underground structure plays an important role in the field of civil engineering.

[0003] At present, the durability test device is mainly used to provide a simulated actual working condition environment for the underground structure to test and study the deterioration process of the underground structure, so as to evaluate the durability of the underground structure. In the process of testing, most of the current durability test devices use a jack to load an axial force on the underground structure, but cannot provide a long-term stable axial pressure for the underground structure in the process of testing. The stress condition of the underground structure in the actual engineering cannot be fully considered, resulting in inaccurate test results. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defect that the durability test device in the prior art cannot fully consider the stress condition of the underground structure in the actual engineering, resulting in inaccurate test results of the durability of the underground structure, so as to provide a durability test device for underground structure.

[0005] According to the durability test device for underground structure provided by the present application, the first clamping plate, the second clamping plate, the elastic member and the support plate are arranged in the above manner.

[0006] The first clamping plate is arranged on one side of the second clamping plate along the axial direction.

[0007] The second clamping plate is arranged on one side of the first clamping plate along the axial direction, and is arranged to slide along the axial direction.

[0008] The elastic member is arranged parallel to the axial direction, and is arranged on the side of the second clamping plate away from the first clamping plate.

[0009] The support plate is arranged to abut the side of the elastic member away from the second clamping plate, and is driven by the driving assembly to move along the axial direction towards the second clamping plate. The support plate has a test state locked by the first locking member. When the support plate is in the test state, the elastic member is in a compressed force storage state, and the support plate cannot move away from the second clamping plate.

[0010] The underground structure durability test device has at least the following technical effects:

[0011] The support plate is arranged on the side of the second clamping plate away from the first clamping plate and slides axially, and an elastic member arranged parallel to the axial direction is arranged between the support plate and the second clamping plate. During the durability test of the underground structure, the underground structure is first arranged axially between the first clamping plate and the second clamping plate, and then the driving assembly is started to drive the support plate to gradually compress the elastic member and move towards the first clamping plate, and the support plate, the elastic member and the second clamping plate move axially towards the first clamping plate together until the second clamping plate and the first clamping plate clamp and fix the underground structure, and the driving assembly applies the set load on the support plate. At this time, the first locking member is locked to limit the freedom of the support plate moving axially away from the second clamping plate, and the support plate is switched to the test state, so that all the energy (load) released by the compressed elastic member is applied to the second clamping plate, and the second clamping plate moves axially towards the first clamping plate, so that all the elastic restoring force (axial force) of the elastic member in the energy storage state is applied to the underground structure, ensuring that the elastic member can still load stable axial force for the underground structure when the underground structure deforms during the test, and further ensuring that the underground structure is provided with long-term stable axial pressure during the test, more accurately simulating the stress condition of the underground structure in actual engineering, and improving the accuracy of the durability test result of the underground structure.

[0012] Preferably, a plurality of screw rods are further included, the screw rods are arranged parallel to the axial direction, and the plurality of screw rods are uniformly distributed along the cross-sectional profile of the first clamping plate perpendicular to the axial direction; the first clamping plate and the second clamping plate are arranged on the screw rods in the axial direction; one end of the screw rod away from the first clamping plate penetrates through the second clamping plate in the axial direction, and the second clamping plate is slidingly sleeved on the screw rod; one elastic member is sleeved on each screw rod in the axial direction, and one support plate is movably sleeved on each screw rod in the axial direction.

[0013] Preferably, the first locking member includes a plurality of first nuts equal in number to the screw rods, and the first nuts are matched with the screw rods; when the support plate is in the test state, the first nuts are screwed on the screw rods, and the first nuts abut against the side of the support plate away from the second clamping plate in the axial direction.

[0014] Preferably, the driving assembly comprises a number of jacks corresponding to the number of the screw rods, each of the jacks is provided with a through hole penetrating through in the axial direction for the screw rod to move through, and the telescopic end of the jack abuts against the side of the support plate away from the second clamping plate; the side of the jack away from the support plate is provided with a locking piece which is screwed on the screw rod.

[0015] Preferably, the jack is connected with an oil pump for supplying oil to the jack in the positive direction or in the reverse direction; a force sensor is arranged between the jack and the locking piece, the force sensor is movably sleeved on the screw rod in the axial direction, the force sensor is communicatively connected with a control terminal, the control terminal is used for receiving the force load value sent by the force sensor and displaying the force load value on the display screen of the control terminal.

[0016] Preferably, a connecting piece is arranged between the force sensor and the jack, the connecting piece is movably sleeved on the screw rod in the axial direction and coaxially arranged with the screw rod and the jack; the force sensor is connected to the connecting piece and coaxially arranged with the connecting piece.

[0017] Preferably, the side of the first clamping plate and the second clamping plate facing each other is respectively provided with a first rotary hinge support and a second rotary hinge support, and the first rotary hinge support and the second rotary hinge support respectively abut and fit the two ends of the underground structure in the axial direction during the test.

[0018] Preferably, the elastic member is a disc spring group formed by a plurality of disc spring pieces connected in series, a connecting pipe is arranged between the elastic member and the screw rod, the connecting pipe is movably sleeved outside the screw rod and coaxially arranged with the screw rod, the disc spring group is movably sleeved outside the connecting pipe in the axial direction and coaxially arranged with the connecting pipe; the side of the support plate facing the second clamping plate is connected with a mounting plate through a mounting column, the mounting plate abuts against the side of the disc spring group away from the second clamping plate, a through hole is formed in the axial direction in the mounting plate, the connecting pipe moves through the through hole, and the diameter of the through hole is smaller than the outer diameter of the disc spring group.

[0019] Preferably, the first clamping plate is movably sleeved on the screw rod in the axial direction, the first clamping plate has a test state locked by a second locking piece, and the first clamping plate cannot move away from the second clamping plate when the first clamping plate is in the test state.

[0020] Preferably, the second locking member comprises second nuts equal in number to the number of the threaded rods, the second nuts being matched with the threaded rods; when the first clamping plate is in the test state, the second nuts are screwed on the threaded rods, and the second nuts abut against the first clamping plate on a side axially away from the second clamping plate.

[0021] Preferably, a side wall of the underground structure perpendicular to the axis is provided with a slot; the durability test device further comprises a solution tank, an opening is provided on a side of the solution tank facing the slot, the opening is adhesively and sealingly connected with the slot; an injection port is provided on a side wall of the solution tank, the injection port is in communication with the inside of the solution tank, and the injection port is used for injecting a corrosive solution into the inside of the solution tank.

[0022] Preferably, a side wall of the solution tank away from the slot is provided with a steel cover plate, and the injection port is provided on the steel cover plate; four flexible walls are provided on a side of the steel cover plate facing the slot, the four flexible walls are sequentially connected in a head-to-tail manner, and surround the opening;

[0023] At least one of the flexible walls is provided with a viewing window for observing the inside of the solution tank;

[0024] And / or, a pressurizing port is provided on a side wall of the solution tank, the pressurizing port is in communication with the inside of the solution tank, and the pressurizing port is used for connecting an air compressor;

[0025] And / or, an electrification interface is provided on a side wall of the solution tank, one end of the electrification interface is electrically connected with an electrode rod, and the other end is used for electrically connecting a power supply; the electrode rod is located in the inside of the solution tank.

[0026] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments or technical solutions of the present application in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 Structure schematic diagram when the present embodiment is equipped with an underground structure but no axial pressure is provided for the underground structure;

[0029] Figure 2 For Figure 1Structure diagram of the underground structure after the axial pressure is provided and the locking piece, force sensor, connecting piece, jack and oil pump are removed;

[0030] Figure 3 Structure diagram of the part of the underground structure;

[0031] Figure 4 Structure diagram of the solution tank in the embodiment;

[0032] Figure 5 Structure diagram of the assembly of the support plate, connecting pipe cylinder and disc spring in the embodiment;

[0033] Figure 6 Structure diagram of the jack in the embodiment.

[0034] Explanation of the reference signs:

[0035] 1-first clamping plate, 11-second rotary hinge support, 12-second nut;

[0036] 2-second clamping plate, 21-second rotary hinge support;

[0037] 3-underground structure;

[0038] 41-support plate, 42-first nut, 43-mounting column, 44-mounting plate, 441-perforation;

[0039] 5-screw rod;

[0040] 61-jack, 611-through hole, 62-locking piece, 63-oil pump, 64-force sensor, 65-control terminal, 66-connecting piece, 67-air compressor;

[0041] 7-disc spring group, 71-connecting pipe cylinder;

[0042] 8-solution tank, 81-liquid injection port, 82-steel cover plate, 83-flexible wall, 831-visual window, 84-pressurizing port, 85-electricity supply interface. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0044] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, 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, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0047] Most of the current durability test devices in the process of conducting durability tests on underground structures usually use jacks to load axial forces on underground structures. During the loading of axial forces, the deformation of underground structures will cause the axial force loaded by the jack to decrease, which cannot provide long-term stable axial pressure for underground structures, cannot fully consider the stress condition of underground structures in actual engineering, and leads to inaccurate test results. In order to solve the above technical problems, the following embodiment provides a kind of underground structure durability test device.

[0048] As Figures 1 to 3The underground structure durability test device provided by the embodiment is shown, which comprises a first clamping plate 1 and a second clamping plate 2, the second clamping plate 2 is located on one side of the first clamping plate 1 along the axial direction, and the second clamping plate 2 is arranged in sliding mode along the axial direction; during the test, the underground structure 3 is clamped and fixed between the first clamping plate 1 and the second clamping plate 2; the side of the second clamping plate 2 away from the first clamping plate 1 is provided with an elastic member, and the elastic member is arranged in parallel to the axial direction; the side of the elastic member away from the second clamping plate 2 abuts against a support plate 41, the support plate 41 is driven by a driving assembly to move along the axial direction towards the second clamping plate 2; the support plate 41 has a test state locked by a first locking member, when the support plate 41 is in the test state, the elastic member is in a compressed force storage state, and the support plate 41 cannot move away from the second clamping plate 2. It can be understood that the axial direction of the embodiment refers to the axial direction in the figure. Figure 1

[0049] The underground structure durability test device of the embodiment is provided with the support plate 41 arranged in sliding mode along the axial direction on the side of the second clamping plate 2 away from the first clamping plate 1, the elastic member arranged in parallel to the axial direction is arranged between the support plate 41 and the second clamping plate 2, and the second clamping plate 2 is arranged in sliding mode along the axial direction; during the durability test of the underground structure 3, first, the underground structure 3 is arranged in the axial direction between the first clamping plate 1 and the second clamping plate 2, then the driving assembly is started to drive the support plate 41 to gradually compress the elastic member and move towards the first clamping plate 1, and the support plate 41, the elastic member and the second clamping plate 2 are driven to move along the axial direction towards the first clamping plate 1 until the second clamping plate 2 and the first clamping plate 1 clamp and fix the underground structure 3, and the driving assembly applies the set load on the support plate 41; at this time, the first locking member is locked, the freedom of the support plate 41 moving along the axial direction away from the second clamping plate 2 is limited, the support plate 41 is switched to the test state, the elastic member in the compressed force storage state releases all the energy (load) to the second clamping plate 2, and the second clamping plate 2 is driven to move along the axial direction towards the first clamping plate 1, so that all the elastic restoring force (axial force) of the elastic member in the force storage state is applied to the underground structure 3, ensuring that the elastic member can still load the underground structure 3 with stable axial force when the underground structure 3 deforms during the test, thereby ensuring that the underground structure 3 is provided with long-term stable axial pressure during the test, more accurately simulating the stress condition of the underground structure 3 in the actual engineering, and improving the accuracy of the durability test result of the underground structure 3.

[0050] ​It is understood that the underground structure 3 in this embodiment is preferably a tunnel segment used in the field of underground civil engineering. In specific applications, the underground structure 3 can also be selected as a diaphragm wall, shaft wall, mine roadway, subway station, integrated utility tunnel, shield tunnel, etc. used in the field of underground civil engineering.

[0051] like Figures 1 to 3 As shown, in some embodiments of the present invention, a plurality of screws 5 are further included, preferably two, wherein the screws 5 are arranged parallel to the axial direction and the two screws 5 are evenly spaced along the cross-sectional profile of the first clamping plate 1 perpendicular to the axial direction; the first clamping plate 1 and the second clamping plate 2 are spaced apart on the screws 5 along the axial direction; one end of the screw 5 away from the first clamping plate 1 passes through the second clamping plate 2, and the second clamping plate 2 is slidably sleeved on the screw 5; each screw 5 is sleeved with an elastic element and is movably sleeved with a support plate 41 along the axial direction. During the durability test of underground structure 3, more elastic potential energy can be stored by compressing the two elastic elements. After the support plate 41 is switched to the test state and the load applied to the support plate 41 by the drive component is removed, the elastic potential energy stored in the two elastic elements in the storage state is released and applied to underground structure 3. This ensures that even if underground structure 3 deforms during the test, the elastic elements can still apply a stable axial force to underground structure 3. This ensures that underground structure 3 is provided with long-term stable axial pressure during the test, more accurately simulates the stress situation of underground structure 3 in actual engineering, and improves the accuracy of the durability test results of underground structure 3.

[0052] In specific applications, the number of screws 5 can be reasonably increased or decreased according to the size of the cross-sectional area of ​​the first clamping plate 1 or the second clamping plate 2 perpendicular to the axial direction, or according to the size of the long-term stable axial pressure provided to the underground structure 3. For example, in other embodiments, the number of screws 5 can be set to three, four or five, etc.

[0053] In some embodiments of the present invention, the first locking member includes a number of first nuts 42 equal to the number of screws 5, and the first nuts 42 are matched with the screws 5; such as Figure 2As shown, when the support plate 41 is in the test state, the first nut 42 is screwed on the screw rod 5, and the first nut 42 abuts against the side of the support plate 41 axially away from the second clamping plate 2. After the driving assembly applies the set load on the support plate 41, the first nut 42 is positively rotated to move the first nut 42 axially towards the support plate 41 until the first nut 42 abuts against the side of the support plate 41 axially away from the second clamping plate 2. At this time, the first nut 42 precisely limits the freedom of the support plate 41 to move axially away from the second clamping plate 2, so that after the load applied by the driving assembly on the support plate 41 is removed, the elastic potential energy stored by the two elastic members in the force storage state is fully released and applied on the underground structure 3, thereby ensuring that the underground structure 3 is provided with long-term stable axial pressure during the test, more accurately simulating the stress condition of the underground structure 3 in actual engineering, and improving the accuracy of the durability test result of the underground structure 3.

[0054] As Figures 1 to 3 , Figure 6It is shown that, in some embodiments of the present application, the driving assembly comprises a number of jacks 61 corresponding to the number of the screw rods 5, each of the jacks 61 has a through hole 611 penetrating through in the axial direction, the through hole 611 is used for the screw rod 5 to move through, and the telescopic end of the jack 61 abuts against the side of the support plate 41 away from the second clamping plate 2. The side of the jack 61 away from the support plate 41 is provided with a locking piece 62 abutting against, and the locking piece 62 is screwed on the screw rod 5. By configuring one jack 61 corresponding to each support plate 41, and abutting the telescopic end of the jack 61 against the support plate 41, the set load can be more accurately applied to each support plate 41, so that after the support plate 41 is switched to the test state, the elastic potential energy stored by each elastic member reaches the set requirement, thereby ensuring that a long-term stable axial pressure is provided for the underground structure 3 during the test, more accurately simulating the stress condition of the underground structure 3 in the actual project, and improving the accuracy of the durability test result of the underground structure 3. At the same time, the locking piece 62 is detachably connected to the screw rod 5 by screw connection, and the jack 61 is movably sleeved on the screw rod 5 in the axial direction, so that after the support plate 41 is switched to the test state and the load applied to the support plate 41 by the driving assembly is removed, the locking piece 62 can be unscrewed first, and then the jack 61 can be taken out of the screw rod 5, which can facilitate disassembly and storage of the durability test device of the present embodiment. In addition, the removed jack 61 can be assembled on another durability test device as a power source to load the set load, so as to perform durability test on another underground structure 3, so that a group of driving assemblies can be selectively assembled on different durability test devices as a power source, thereby loading long-term stable axial pressure on multiple underground structures 3 respectively in a short time to perform durability test, and reducing the investment cost of the device.

[0055] It should be noted that, because the present embodiment switches the support plate 41 to the test state by screwing the first nut 42 on the screw rod 5 and abutting and fitting the support plate 41 on the side away from the second clamping plate 2 in the axial direction, the corresponding locking piece 62 and jack 61 are removed from each screw rod 5, and after the test is completed, the first nut 42 can be removed from the corresponding screw rod 5 first, and then the corresponding support plate 41 and elastic member can be removed from the screw rod 5 in sequence, and finally the second clamping plate 2 can be removed from the screw rod 5, so that most of the components of the durability test device of the present embodiment can be removed for storage or maintenance or replacement or transportation to other places for assembly and use.

[0056] Specifically, the jack 61 is preferably a tensioning jack.

[0057] As Figure 1As shown, in some embodiments of the present application, the jack 61 is connected with an oil pump 63, the oil pump 63 is used to supply oil to the jack 61 in a forward direction or in a reverse direction; a force sensor 64 is arranged between the jack 61 and the locking piece 62, the force sensor 64 is movably sleeved on the screw rod 5 in an axial direction, the force sensor 64 is communicatively connected with a control terminal 65, the control terminal 65 is used to receive the force load value sent by the force sensor 64, and display the force load value on the display screen of the control terminal 65. By arranging the force sensor 64 between the jack 61 and the locking piece 62, the jack 61 is movably sleeved outside the screw rod 5, and because the locking piece 62 is screwed on the screw rod 5, according to Newton's third law, when the jack 61 applies a load on the support plate 41, a corresponding load will also act on the force sensor 64, so that the operator can accurately and intuitively judge whether the jack 61 applies the set load on the support plate 41 by reading the force load value detected by the force sensor 64 and displayed on the display screen of the control terminal 65, and can switch the support plate 41 to a test state by the first locking piece on the basis that the jack 61 applies the set load on the support plate 41, to ensure that the underground structure 3 is provided with a long-term stable axial pressure during the test, to more accurately simulate the stress condition of the underground structure 3 in the actual project, and to improve the accuracy of the durability test result of the underground structure 3. At the same time, by movably sleeving the force sensor 64 on the screw rod 5 in an axial direction, after the locking piece 62 is detached from the screw rod 5, the force sensor 64 and the jack 61 can be taken out from the screw rod 5 together, which can facilitate disassembling and storing the durability test device of the present embodiment; and the detached jack 61 and force sensor 64 can be assembled on another said durability test device as a power source and a force load value detection unit to load the set load and detect the force load value, so as to perform durability test on the underground structure 3 clamped on another said durability test device, thereby reducing the investment cost of the device.

[0058] Specifically, the control terminal 65 is a computer.

[0059] More specifically, the oil pump 63 is electrically connected with the control terminal 65, after the jack 61 applies the set load on the support plate 41 and switches the support plate 41 to the test state, the control terminal 65 controls the oil pump 63 to supply oil to the jack 61 in a reverse direction to accurately control the retracting of the telescopic end of the jack 61 to remove the load applied on the support plate 41.

[0060] As Figure 1 and Figure 3As shown, in some embodiments of the present invention, a connector 66 is provided between the force sensor 64 and the jack 61. The connector 66 is axially movably sleeved on the screw 5 and is coaxially arranged with the screw 5 and the jack 61. The force sensor 64 is connected to the connector 66 and is coaxially arranged with the connector 66. By arranging the force sensor 64, the jack 61, and the screw 5 coaxially through the connector 66, the force sensor 64 can more accurately detect the load value applied by the jack 61 to the support plate 41. This allows the operator to more accurately determine whether the jack 61 has applied the set load to the support plate 41, further improving the accuracy of the durability test results of the underground structure 3.

[0061] like Figures 1 to 3 As shown, in some embodiments of the present invention, a first rotating hinge support 11 and a second rotating hinge support 21 are respectively provided on the side of the first clamping plate 1 and the second clamping plate 2 facing each other. During the test, the first rotating hinge support 11 and the second rotating hinge support 21 respectively abut against and fit against the two ends of the underground structure 3 along the axial direction. During the application of axial pressure, the underground structure 3 will bend and deform, causing a slight rotation of the contact surfaces on both sides of the underground structure 3 along the axial direction. Compared to the case where the two ends of the underground structure 3 along the axial direction are in direct contact with the first clamping plate 1 and the second clamping plate 2 respectively facing each other, after the underground structure 3 bends and deforms, the surface contact between the underground structure 3 and the first clamping plate 1 and the second clamping plate 2 along the axial direction will become a line contact at a higher position. In this embodiment, through the self-adjustment of the first rotating hinge support 11 and the second rotating hinge support 21, the contact surfaces on both sides of the underground structure 3 along the axial direction can always maintain a complete contact state with the first rotating hinge support 11 and the second rotating hinge support 21 respectively, while ensuring a fixed eccentricity, thereby further improving the accuracy of the durability test results of the underground structure 3.

[0062] like Figure 3 and Figure 5As shown in the drawings, in some embodiments of the present application, the elastic member is provided as a disc spring group 7 formed by a plurality of disc spring pieces connected in series, a connecting barrel 71 is arranged between the elastic member and the screw rod 5, the connecting barrel 71 is movably sleeved outside the screw rod 5 and arranged coaxially with the screw rod 5, and the disc spring group 7 is movably sleeved outside the connecting barrel 71 and arranged coaxially with the connecting barrel 71. The mounting plate 44 is connected to one side of the support plate 41 facing the second clamping plate 2 through the mounting column 43, the mounting plate 44 abuts against one side of the disc spring group 7 away from the second clamping plate 2, a through hole 441 is formed in the mounting plate 44 along the axial direction, the connecting barrel 71 movably passes through the through hole 441, and the diameter of the through hole 441 is smaller than the outer diameter of the disc spring group 7. By increasing the outer diameter of the part of the screw rod 5 for movably sleeving the disc spring group 7 through the connecting barrel 71, it is ensured that, without increasing the outer diameter of the screw rod 5 as a whole, the connecting barrel 71 can effectively prevent the disc spring group 7 from generating a larger displacement perpendicular to the axial direction during the process of being compressed to switch to the force storage state of storing elastic potential energy, so as to ensure that the load energy applied on the support plate 41 by the jack 61 is basically converted into the elastic potential energy stored in the disc spring group 7 in the force storage state, thereby ensuring that a long-term stable axial pressure is provided for the underground structure 3 during the test, the stress condition of the underground structure 3 in the actual project is more accurately simulated, and the accuracy of the durability test result of the underground structure 3 is improved.

[0063] As shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, in some embodiments of the present application, the first clamping plate 1 is movably sleeved on the screw rod 5 along the axial direction, the first clamping plate 1 has a test state locked by the second locking member, and the first clamping plate 1 cannot move away from the second clamping plate 2 in the test state. By movably sleeving the first clamping plate 1 on the screw rod 5 along the axial direction, the position of the first clamping plate 1 can be adjusted to match the axial distance between the second clamping plate 2 and the underground structure 3 to be tested during the test, and then the second locking member is locked to accurately limit the freedom of movement of the first clamping plate 1 away from the second clamping plate 2 along the axial direction, thereby being suitable for the durability test of underground structures 3 with different axial dimensions and having strong practicability.

[0064] In some embodiments of the present application, the second locking member comprises a number of second nuts 12 equal to the number of the threaded rods 5, and the second nuts 12 are matched with the threaded rods 5; when the first clamping plate 1 is in the test state, the second nuts 12 are screwed on the threaded rods 5, and the second nuts 12 abut against the side of the first clamping plate 1 axially away from the second clamping plate 2, at this time the second nuts 12 accurately limit the freedom of the first clamping plate 1 to move axially away from the second clamping plate 2, so that the first clamping plate 1 and the second clamping plate 2 cooperate to fix and clamp the underground structure 3. After the test is completed, the second nuts 12 can be removed from the corresponding threaded rods 5 first, and then the first clamping plate 1 is removed from the threaded rods 5, so that part of the components of the durability test device of the present embodiment can be disassembled for storage or repair and replacement.

[0065] As shown in Figure 1 , Figure 2 and Figure 4 , in some embodiments of the present application, the side wall of the underground structure 3 perpendicular to the axial direction is provided with a slot; the durability test device further comprises a solution tank 8, the side of the solution tank 8 facing the slot is provided with an opening, the opening is adhesively and sealingly connected with the slot; the side wall of the solution tank 8 is provided with a liquid injection port 81, the liquid injection port 81 communicates with the inside of the solution tank 8, and the liquid injection port 81 is used to inject corrosive solution into the inside of the solution tank 8. By providing a slot on the side wall of the underground structure 3 perpendicular to the axial direction, during the durability test of the underground structure 3, the surrounding wall of the opening of the solution tank 8 is sealingly connected with the surrounding wall of the slot by adhesive, and then corrosive solution is injected into the inside of the solution tank 8 through the liquid injection port 81, the corrosive solution contacts with the surrounding wall of the slot of the underground structure 3, providing a one-sided solution erosion simulation environment for the underground structure 3, realizing the provision of long-term stable axial pressure and one-sided solution erosion simulation environment for the underground structure 3, more accurately simulating the stress condition of the underground structure 3 in actual engineering, and improving the accuracy of the durability test result of the underground structure 3.

[0066] Specifically, the opening and the slot are adhesively and sealingly connected by sealing glue, and the sealing glue can be selected as BONTE 1408 white neutral silicone mechanical plane sealing glue.

[0067] As shown in Figure 4As shown, in some embodiments of the present invention, the side wall of the solution chamber 8 facing away from the slot is provided as a steel cover plate 82, and the injection port 81 is provided on the steel cover plate 82; the side of the steel cover plate 82 facing the slot is provided with four flexible walls 83, the four flexible walls 83 are connected end to end and form the opening; one of the flexible walls 83 is provided with a viewing window 831, the viewing window 831 is used to observe the interior of the solution chamber 8. Considering that during the test of the underground structure 3 under stable axial pressure, the underground structure 3 will deform, bend, and arch to the side perpendicular to the axial direction, and will continue to deform over time under long-term stable axial pressure, in this embodiment, the solution chamber 8 is attached to the side of the underground structure 3 perpendicular to the axial direction by a flexible wall 83, so that the solution chamber 8 and the underground structure 3 are in flexible contact connection. This ensures that even if the underground structure 3 deforms during the test, the flexible wall 83 can still fit tightly against the underground structure 3, thereby providing a better simulation environment of unilateral solution erosion for the underground structure 3 and improving the accuracy of the durability test results of the underground structure 3. At the same time, the internal condition of the solution chamber 8 can be easily observed through the viewing window 831.

[0068] To prevent the steel cover plate 82 from being easily corroded and damaged by the corrosive solution, and to extend the service life of the steel cover plate 82, the steel cover plate 82 is made of stainless steel duplex steel-2205, a material resistant to chloride ion corrosion.

[0069] like Figure 1 and Figure 4 As shown, in some embodiments of the present invention, a pressurization port 84 is provided on the side wall of the solution chamber 8. The pressurization port 84 communicates with the interior of the solution chamber 8 and is used to connect to an air compressor 67. During the durability test of the underground structure 3, the pressurization port 84 is connected to the air compressor 67. The air compressor 67 pressurizes the gas in the solution chamber 8 through the pressurization port 84, providing a simulation environment of unilateral high-pressure solution erosion for the underground structure 3. This more accurately simulates the stress condition of the underground structure 3 in actual engineering and improves the accuracy of the durability test results of the underground structure 3. Specifically, the pressurization port 84 is provided on the steel cover plate 82.

[0070] like Figure 1 and Figure 2As shown, specifically, the air compressor 67 is communicatively connected with a control terminal 65, which controls the air compressor 67 to pressurize the gas in the solution tank 8 through the pressurizing port 84 and control the gas pressure, so as to accurately control the high pressure degree of the high-pressure solution erosion simulation environment provided to the underground structure 3, so as to more accurately simulate the stress condition of the underground structure 3 in actual engineering. More specifically, the control terminal 65 is also used to receive the output air pressure value of the air compressor 67 and display the output air pressure value on the display screen of the control terminal 65.

[0071] As shown in the drawings, Figure 4 In some embodiments of the present application, an electrification interface 85 is arranged on the side wall of the solution tank 8, one end of the electrification interface 85 is electrically connected with an electrode rod, and the other end is used for electrically connecting a power supply; the electrode rod is located inside the solution tank 8. During the durability test of the underground structure 3, the electrification interface 85 is electrically connected with the power supply, so that the electrode rod, the corrosion solution and the underground structure 3 are electrified, the corrosion of the high-pressure solution erosion simulation environment to the underground structure 3 is accelerated, the test time is shortened, and the test efficiency is improved. Specifically, the electrification interface 85 is arranged on the steel cover plate 82.

[0072] In order to avoid electric leakage, specifically, the flexible wall 83 is arranged as an oil-resistant rubber plate or a silica gel plate. In order to ensure the integrity of the solution tank 8, more specifically, the steel cover plate 82 and the flexible wall 83 are integrally formed by a mold.

[0073] Obviously, the above embodiments are only examples for clearly illustrating, but not limiting the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A durability testing device for underground structures, characterized in that, The utility model relates to a kind of underground structure test device, including: First clamping plate (1); Second clamping plate (2), it is located in the axial side of the first clamping plate (1), the second clamping plate (2) is arranged along axial sliding;During test, the first clamping plate (1) and the second clamping plate (2) are used to clamp and fix underground structure (3) between; Elastic member, it is arranged in parallel to axial, the elastic member is arranged in the side of the second clamping plate (2) away from the first clamping plate (1); Support plate (41), it is abutted to the side of the elastic member away from the second clamping plate (2), the support plate (41) is driven by drive assembly and moves along axial towards the second clamping plate (2);The support plate (41) has the test state of being locked by first locking member, when the support plate (41) is in the test state, the elastic member is in the force storage state of being compressed, and the support plate (41) cannot move in the direction away from the second clamping plate (2); Further include a plurality of screw rods (5), the screw rod (5) is arranged in parallel to axial, a plurality of the screw rod (5) is uniformly distributed along the cross profile of the first clamping plate (1) perpendicular to axial;The first clamping plate (1) and the second clamping plate (2) are arranged along axial spacing on the screw rod (5);The end of the screw rod (5) away from the first clamping plate (1) penetrates the second clamping plate (2) along axial, and the second clamping plate (2) is slidably connected on the screw rod (5);Each elastic member is sleeved on the screw rod (5), and one support plate (41) is movably connected along axial; The drive assembly includes the number of jack (61) with the screw rod (5), the through hole (611) is penetrated along axial in each jack (61), and the through hole (611) is used to move through the screw rod (5), and the telescopic end of the jack (61) is abutted to the side of the support plate (41) away from the second clamping plate (2);Locking piece (62) is arranged on the side of the jack (61) away from the support plate (41), and the locking piece (62) is screwed on the screw rod (5); The jack (61) is connected with oil pump (63), and the oil pump (63) is used to supply oil in positive direction or reverse direction to the jack (61);Force sensor (64) is arranged between the jack (61) and the locking piece (62), the force sensor (64) is movably connected on the screw rod (5) along axial, and the control terminal (65) is communicatively connected with the force sensor (64), the control terminal (65) is used to receive the force load value sent by the force sensor (64), and the force load value is displayed on the display screen of the control terminal (65). The underground structure (3) is provided with a slot in the side wall perpendicular to the axial direction; the durability test device further comprises a solution tank (8), which is provided with an opening on the side facing the slot, and the opening is in adhesive sealing connection with the slot; the side wall of the solution tank (8) is provided with a liquid injection port (81), which is in communication with the inside of the solution tank (8), and the liquid injection port (81) is used for injecting corrosive solution into the inside of the solution tank (8); The side wall of the solution tank (8) is provided with a pressurizing port (84), which is in communication with the inside of the solution tank (8), and the pressurizing port (84) is used for connecting an air compressor (67); The side wall of the solution tank (8) is provided with an electrifying interface (85), one end of which is electrically connected with an electrode rod, and the other end is used for electrically connecting a power supply; the electrode rod is located in the inside of the solution tank (8).

2. The durability test apparatus for an underground structure according to claim 1, wherein The first locking member comprises a plurality of first nuts (42) corresponding to the number of the screw rods (5), and the first nuts (42) are matched with the screw rods (5); when the support plate (41) is in the test state, the first nuts (42) are screwed on the screw rods (5), and the first nuts (42) abut against one side of the support plate (41) away from the second clamping plate (2) in the axial direction.

3. The durability testing apparatus for an underground structure according to claim 1, wherein A connecting piece (66) is arranged between the force sensor (64) and the jack (61), the connecting piece (66) is movably sleeved on the screw rod (5) in the axial direction, and is coaxially arranged with the screw rod (5) and the jack (61); the force sensor (64) is connected to the connecting piece (66) and is coaxially arranged with the connecting piece (66); And / or, one side of the first clamping plate (1) and the second clamping plate (2) facing each other is respectively provided with a first rotary hinge support (11) and a second rotary hinge support (21), and during the test, the first rotary hinge support (11) and the second rotary hinge support (21) respectively abut and fit on the two ends of the underground structure (3) in the axial direction; And / or, the elastic member is a disc spring group (7) formed by a plurality of disc spring pieces connected in series, a connecting pipe cylinder (71) is arranged between the elastic member and the screw rod (5), the connecting pipe cylinder (71) is movably sleeved outside the screw rod (5) and coaxially arranged with the screw rod (5), the disc spring group (7) is movably sleeved outside the connecting pipe cylinder (71) and coaxially arranged with the connecting pipe cylinder (71); one side of the support plate (41) facing the second clamping plate (2) is connected with a mounting plate (44) through a mounting column (43), the mounting plate (44) abuts against one side of the disc spring group (7) away from the second clamping plate (2), a through hole (441) is formed in the mounting plate (44) in the axial direction, the connecting pipe cylinder (71) movably passes through the through hole (441), and the diameter of the through hole (441) is smaller than the outer diameter of the disc spring group (7).

4. The durability testing apparatus for an underground structure according to claim 1, wherein The first clamping plate (1) is movably sleeved on the screw rod (5) in the axial direction, the first clamping plate (1) has a test state locked by a second locking member, and the first clamping plate (1) cannot move away from the second clamping plate (2) when the first clamping plate (1) is in the test state.

5. The durability testing apparatus for an underground structure according to claim 4, wherein The second locking member comprises second nuts (12) equal in number to the screw rod (5), the second nuts (12) are matched with the screw rod (5), the second nuts (12) are screwed on the screw rod (5) when the first clamping plate (1) is in the test state, and the second nuts (12) abut against one side of the first clamping plate (1) away from the second clamping plate (2) in the axial direction.

6. The durability testing apparatus for an underground structure according to claim 1, wherein A steel cover plate (82) is arranged on the side wall of the solution bin (8) away from the slot, and the liquid injection port (81) is arranged on the steel cover plate (82); four flexible walls (83) are arranged on the side of the steel cover plate (82) facing the slot, the four flexible walls (83) are sequentially connected in a head-to-tail manner, and the four flexible walls (83) surround the opening; At least one of the flexible walls (83) is provided with a visual window (831) for observing the inside of the solution bin (8).

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