High polymer expansion performance testing device with variable stiffness constraint function

Abstract

The utility model discloses a high polymer expansion performance testing device with a variable stiffness constraint function. The device comprises a cylinder, a cover plate, a bottom plate and a sliding assembly, wherein the cover plate and the bottom plate are arranged at the upper end and the lower end of the cylinder; the sliding assembly comprises a threaded rod and a piston connected with one end of the threaded rod, the piston is tightly attached to the inner wall of the cylinder, and the other end of the threaded rod penetrates through the cover plate and is connected with the tray; the threaded rod is further sleeved with a flat-bottom spring, and the flat-bottom spring is located between the cover plate and the piston. A plurality of reserved threaded holes are formed in the side wall, close to the bottom plate, of the cylinder in a penetrating mode, each threaded hole is used for containing a corresponding sensor, and the bottom plate is further used for being connected with a grouting pipe. The utility model aims to improve the accuracy of experimental parameters obtained by the expansion performance testing device.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer grouting, in particular to a polymer expansion performance testing device with a variable stiffness constraint function. Background Art

[0002] At present, polymer grouting is an emerging reinforcement and repair technology in engineering. It is widely used in foundation reinforcement, settlement lifting and dam anti-seepage due to its characteristics of rapid construction, non-excavation, low disturbance and no pollution. However, the existing polymer expansion performance detection device has a relatively simple function, and detects parameters under a constant single condition, such as measuring polymer density under constant external pressure and measuring polymer expansion force under fixed volume. As a result, there is a certain gap between the test conditions and engineering applications. For example, in split grouting and compaction grouting projects, the soil medium cracks or deforms greatly under the action of slurry, and the volume of injected slurry changes continuously. As the soil is squeezed, the pressure is also changing continuously. The slurry expansion force curve measured under a single constant condition is obviously not applicable to such scenarios.

[0003] And the existing invention patent CN108572124A discloses a polymer slurry self-expansion property test device, which is used to test the self-expansion property of polymer slurry under different water pressure environments. The device includes a pressure container, a pressure control system, a flow monitoring system and a water inlet and drainage pipeline. The pressure control system includes a safety valve and a pressure test pump; the water inlet and drainage pipeline includes an inlet pipe and a drainage pipe. Although the self-expansion property test of the polymer slurry can be realized, it can only test the expansion performance of the polymer slurry under different water pressure environments, and thus the device cannot simulate the expansion performance of the polymer under the influence of changes in actual applications, making the final data obtained inaccurate; therefore, it is urgent to test the expansion performance of the polymer under variable stiffness constraints. Utility Model Content

[0004] The main purpose of the utility model is to provide a polymer expansion performance testing device with a variable stiffness constraint function, aiming to solve the technical problem that the existing expansion performance testing device cannot obtain accurate experimental parameters.

[0005] To achieve the above object, the utility model provides a polymer expansion performance testing device with variable stiffness constraint function, the device comprising a cylinder, a cover plate and a bottom plate arranged at the upper and lower ends of the cylinder, and a sliding component inside the cylinder;

[0006] The sliding assembly includes a threaded rod and a piston connected to one end of the threaded rod, the piston is tightly fitted to the inner wall of the cylinder, and the other end of the threaded rod passes through the cover plate and is connected to the tray;

[0007] The threaded rod is also sleeved with a flat bottom spring, and the flat bottom spring is located between the cover plate and the piston;

[0008] A plurality of reserved threaded holes are provided through the side wall of the cylinder close to the bottom plate, each threaded hole is used to place a corresponding sensor, and the bottom plate is also used to be connected to the grouting pipe.

[0009] Optionally, the device further comprises a plurality of connecting rods, and the plurality of connecting rods penetrate the cover plate and the bottom plate in a circle-centered symmetrical manner.

[0010] Optionally, the cover plate is provided with a plurality of cover plate connecting rod holes, the bottom plate is provided with a plurality of bottom plate connecting rod holes, and a plurality of connecting rods pass through the corresponding cover plate connecting rod holes and bottom plate connecting rod holes respectively.

[0011] Optionally, the cover plate is further provided with a cover plate threaded rod hole, the cover plate threaded rod hole is used for the threaded rod to pass through, and the inner diameter of the cover plate threaded rod hole is greater than the outer diameter of the threaded rod.

[0012] Optionally, the base plate is provided with base plate grouting holes for connecting to a grouting pipe.

[0013] Optionally, one end of each connecting rod passing through the cover plate is a connecting rod threaded end, and each connecting rod threaded end is connected and fixed to the cover plate by a first nut.

[0014] Optionally, the threaded rod is further sleeved with two second nuts, which are respectively arranged at the upper and lower parts of the cover plate.

[0015] Optionally, the inner wall of the cylinder is also provided with a circle of heat insulation layer.

[0016] Optionally, a grouting pipe hole plug is also provided at the end of the grouting pipe.

[0017] Optionally, the cover plate, tray, flat bottom spring and piston are all detachable.

[0018] Beneficial effects:

[0019] The utility model proposes a polymer expansion performance test device with variable stiffness constraint function, which comprises a hollow cylinder, a sliding assembly that can provide variable constraint and a connecting rod for fixing the cylinder. The lower end of the cylinder is provided with a bottom plate connected together, and the inner wall of the cylinder is provided with a layer of heat-insulating material to ensure that the heat generated during the polymer reaction will not dissipate. A threaded hole that matches the sensor is provided below the inner wall, and the corresponding temperature sensor and pressure sensor can be placed in the cylinder to detect the heat and expansion pressure generated during the polymer reaction at all times. A grouting hole is provided at the center of the bottom plate, and a grouting pipe extends into the grouting hole to grout into the cylinder. After the grouting is completed, a plug can be provided to block the grouting pipe to prevent the slurry from flowing out. The piston fits the inner wall of the cylinder and can slide up and down, and the polymer slurry will not pass through the piston to the upper part of the cylinder for reaction. The flat-bottomed spring can change the length and stiffness coefficient according to its own needs. The connecting rod passes through the bottom plate and the cover plate, and the upper end of the connecting rod is threaded. The cover plate has a small hole that can just pass the connecting rod, and the cylinder and the sliding assembly can be fixed by tightening the nut. The connecting rod passes through the bottom plate with the same length as the base of the device. During the experiment, the insulation layer and the spring can simulate the expansion of the slurry under variable stiffness constraints and adiabatic conditions, and the temperature sensor and the pressure sensor can be used to obtain a variety of parameters required in the expansion process of the polymer under these conditions. Furthermore, the utility model can test the expansion performance of polymers under variable stiffness constraints and adiabatic conditions. Different from the previous detection of parameters under a constant single condition, and the ability to detect a variety of situations, one device can perform detection under multiple states to obtain rich parameters, and can better simulate the real situation and is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is an overall schematic diagram of a polymer expansion performance testing device with variable stiffness constraint function according to the utility model;

[0022] Figure 2 It is a cross-sectional schematic diagram of a polymer expansion performance testing device with variable stiffness constraint function according to the utility model;

[0023] Figure 3 This is a schematic diagram of the detailed structure of the sliding assembly of the utility model;

[0024] Figure 4This is a schematic diagram of the detailed structure of the cylindrical bottom plate of the utility model;

[0025] Figure 5 This is a detailed schematic diagram of the utility model in which the cylinder, bottom plate and cover plate are connected as a whole by connecting rods;

[0026] Figure 6 It is a schematic diagram of the connection between the sliding assembly, the connecting rod and the cover plate when the variable stiffness constraint simulation is performed in the utility model;

[0027] Figure 7 It is a schematic diagram of the connection between the sliding assembly, the connecting rod and the cover plate when the constant volume simulation is performed in the utility model;

[0028] Figure 8 This is a schematic diagram of the temperature sensor structure used in the utility model;

[0029] Fig. 9 This is a schematic diagram of the structure of the pressure sensor used in the utility model.

[0030] Description of Figure Numbers:

[0031] Label name Label name 1 Cylinder 2 link 3 Cover 4 Threaded rod 5 Base Plate 6 Grouting pipe 7 First nut 8 Second nut 9 tray 10 Flat spring 11 piston 12 Insulation layer 13 Pressure Sensors 14 Temperature Sensor 201 Connecting rod threaded end 301 Cover plate connecting rod hole 302 Cover plate threaded rod hole 501 Bottom plate connecting rod hole 502 Floor grouting hole 601 Grouting pipe hole plug

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that all directional indications (such as up, down, etc.) in the implementation mode of the utility model are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0036] Furthermore, the technical solutions between the various implementation modes of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] See also Figures 1 to 9 According to one aspect of the utility model, the utility model provides a polymer expansion performance testing device with a variable stiffness constraint function, the device comprising a cylinder 1, a cover plate 3 and a bottom plate 5 arranged at the upper and lower ends of the cylinder 1, and a sliding assembly sliding inside the cylinder 1. Preferably, the cylinder 1 adopts an integrated cylindrical column.

[0038] Among them, Figure 2 As shown, the sliding assembly includes a threaded rod 4 and a piston 11 connected to one end of the threaded rod 4, the piston 11 is tightly fitted on the inner wall of the cylinder 1, and the other end of the threaded rod 4 passes through the cover plate 3 and is connected to the tray 9, wherein there is a threaded hole in the piston 11, and the threaded rod 4 can be screwed into the piston; the threaded rod 4 is also sleeved with a flat-bottom spring 10, and the flat-bottom spring 10 is located between the cover plate 3 and the piston 11. Furthermore, in the real grouting environment, the slurry slowly expands, fills the lower space of the cylinder 1, and then begins to squeeze the piston 11 to move upward, and the piston 11 begins to squeeze the flat-bottom spring 10, which is flat from top to bottom. In the squeezed state, it can be tightly attached to the cover plate 3 and the piston 11, and is sleeved on the threaded rod 4, and cannot move around, and the force is stable. And the cover plate 3 is fixed, and the flat-bottom spring 10 is gradually compressed under the expansion pressure of the slurry. Grouting will be subjected to increasing pressure due to squeezing the soil, and the spring can well simulate this pressure condition.

[0039] Furthermore, if Figure 3 As shown, the cover plate 3, the tray 9, the flat bottom spring 10, the piston 11 and the threaded rod 4 are detachable. And the flat bottom springs of different lengths and stiffness coefficients can be replaced according to actual needs.

[0040] Furthermore, a plurality of reserved threaded holes are provided through the side wall of the cylinder 1 near the bottom plate 5, each threaded hole is used to place a corresponding sensor, and the bottom plate 5 is also used to connect with the grouting pipe 6, so that the slurry is injected into the cylinder 1 from the grouting pipe 6. After the grouting is completed, the grouting pipe hole plug 601 is used to block the pipe mouth to prevent the slurry from leaking out. The slurry reacts in the cylinder 1 and begins to expand. Preferably, a layer of insulation layer 12 can be added to the inner wall of the cylinder 1 to ensure that the slurry will not be affected by the external ambient temperature while reacting, and can be close to the state of the real grouting environment, and then the variable stiffness constraint of the spring and the insulation material are used to isolate the influence of the external temperature to simulate a more realistic grouting environment, so as to test the expansion performance of the polymer and obtain relevant parameters.

[0041] Furthermore, if Figure 2 As shown, a pressure sensor 13 and a temperature sensor 14 are installed in the cylinder 1 near the bottom plate 5 to detect parameters such as temperature and pressure during the expansion of the slurry. The insulation layer 12 and the cylinder 1 are provided with corresponding threads at corresponding positions, and the sensors are also provided with corresponding bolts, which can be directly tightened for installation when needed, such as Figure 8-9 As shown, the temperature and pressure data during the slurry expansion process can be monitored in real time, ultimately making the measured data more accurate and direct.

[0042] Furthermore, in order to enhance the stabilizing effect, the device further comprises a plurality of connecting rods 2, and the plurality of connecting rods 2 penetrate the cover plate 3 and the bottom plate 5 in a symmetrical manner about the center of a circle. Figure 4-5 As shown, the cover plate 3 is provided with a plurality of cover plate connecting rod holes 301, the bottom plate 5 is provided with a plurality of bottom plate connecting rod holes 501, and a plurality of connecting rods 2 respectively pass through the corresponding cover plate connecting rod holes 301 and bottom plate connecting rod holes 501. Figure 4-5 In the embodiment, three connecting rods 2 are provided. In practical application, the corresponding number can be adjusted according to actual needs.

[0043] Furthermore, one end of each connecting rod 2 passing through the cover plate 3 is a connecting rod threaded end 201, each connecting rod threaded end 201 is connected and fixed to the cover plate 3 by a first nut 7, and the connecting rod 2 exposed under the bottom plate 5 has the same length, which can be used as a support to allow the device to be stably placed vertically.

[0044] Furthermore, if Figure 5 As shown, the cover plate 3 is also provided with a cover plate threaded rod hole 302, the cover plate threaded rod hole 302 is used to allow the threaded rod 4 to pass through, and the inner diameter of the cover plate threaded rod hole 302 is greater than the outer diameter of the threaded rod 4. When variable stiffness constraint simulation is required, Figure 6 As shown, first put the piston 11 and the threaded rod 4 vertically into the cylinder 1, and then put on the flat-bottom spring 10, so that the piston can fit the inner wall of the tube and prevent the slurry from flowing to the upper part of the piston. Then place the cover plate 3, and the threaded rod passes through the threaded rod hole 302 of the cover plate. The diameter of the hole is larger than the diameter of the threaded rod, so the threaded rod can move up and down without obstruction. The connecting rod 2 passes through the connecting rod hole 301 on the cover plate, and then is tightened with the first nut 7. The tray 9 is screwed down to the position shown in the figure, so that the sliding assembly will not fall, but can extend outward.

[0045] Furthermore, if Figure 4 As shown, the bottom plate 5 is provided with a bottom plate grouting hole 502 for connecting with a grouting pipe 6 , and the grouting hole 502 of the bottom plate is for the grouting pipe 6 to pass through the hole to perform grouting into the cylinder 1 .

[0046] Furthermore, if Figure 7As shown, the threaded rod 4 is also provided with two second nuts 8, which are respectively arranged at the upper and lower parts of the cover plate 3, so as to fix the threaded rod 4. It can be used for simulation requiring constant pressure or constant volume. In this case, there is no need to provide a spring in the threaded rod 4. Specifically, the threaded rod 4 needs to be lowered to a suitable height, a second nut 8 is installed under the cover plate 3, and then the cover plate 3 is installed. Then, the second second nut 8 is tightened above the cover plate 3 to fix the threaded rod 4, so that the polymer can react in a constant space.

[0047] In addition, in order to better illustrate the structure of the utility model, the following specific operation steps are used to test the expansion characteristics of polymers under the variable stiffness constraint function: Figure 5 The assembly shown in the figure first removes the cover plate, installs the required pressure sensor 14 and temperature sensor 13, then fixes the piston 11 and the threaded rod 4 together, selects the required flat-bottom spring 10 according to its own situation, sleeves it on the threaded rod 4, puts it into the cylinder, installs the cover plate 3, tightens and fixes the cover plate 3 at the connecting rod threaded end 201 with the first nut 7, then installs the tray 9 and screws it above the threaded rod 4. Next is grouting in the cylinder 1, the grouting pipe 6 passes through the grouting hole 502 of the base plate, and the polymer slurry of the reaction is injected through the grouting pipe 6. After the injection, the grouting pipe hole plug 601 is used to block the grouting pipe 6 to prevent the polymer slurry from leaking. At this time, the polymer slurry begins to react and expand, pushing the piston 11 to slide upward, and the spring 10 is squeezed and contracted, providing a variable stiffness constraint. The greater the compression of the spring, the greater the elastic force provided, and the slurry is increasingly difficult to expand in the simulated real situation. The installed sensor will continuously detect during the reaction process, and the curve of the slurry expansion force or the heat released can be obtained as the reaction time changes, and the polymer density can be calculated. After the reaction is finished, the sliding assembly can be disassembled and the polymer can be cleaned from the upper opening of the cylinder 1 for next use.

[0048] The expansion characteristics of the polymer are tested under a fixed stiffness and constant pressure. No spring is required when installing the sliding assembly. Then, according to the required pressure, an object of corresponding weight can be placed on the cover plate 3. Other operations can be performed as described above for testing.

[0049] The expansion properties of polymers are tested at a constant volume and fixed stiffness, such as Figure 7 The sliding assembly is installed as shown, and no spring is needed. The piston is lowered to a suitable position by selecting a suitable volume, and the threaded rod can be fixed by tightening the cover plate 3 up and down with two second nuts 8. The polymer can react in the constant space below the piston.

[0050] In the above embodiments, those skilled in the art may adopt the existing technology for software control. The present utility model only protects the structure of the polymer expansion performance testing device with variable stiffness constraint function and the mutual connection relationship.

[0051] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A polymer expansion performance testing device with variable stiffness constraint function, characterized in that: The device comprises a cylinder (1), a cover plate (3) and a bottom plate (5) arranged at the upper and lower ends of the cylinder (1), and a sliding assembly inside the cylinder (1), wherein the cylinder (1) is an integrated cylindrical column; The sliding assembly comprises a threaded rod (4) and a piston (11) connected to one end of the threaded rod (4), wherein the piston (11) is tightly fitted on the inner wall of the cylinder (1), and the other end of the threaded rod (4) passes through the cover plate (3) and is connected to the tray (9); The threaded rod (4) is also sleeved with a flat-bottom spring (10), and the flat-bottom spring (10) is located between the cover plate (3) and the piston (11); A plurality of reserved threaded holes are provided through the side wall of the cylinder (1) near the bottom plate (5), each threaded hole is used to place a corresponding sensor, the bottom plate (5) is also used to connect with the grouting pipe (6), and the inner wall of the cylinder (1) is also provided with a circle of insulation layer (12).

2. The polymer expansion performance testing device with variable stiffness constraint function according to claim 1, characterized in that: The device further comprises a plurality of connecting rods (2), wherein the plurality of connecting rods (2) penetrate the cover plate (3) and the bottom plate (5) in a circle-centered symmetrical manner.

3. The polymer expansion performance testing device with variable stiffness constraint function according to claim 2, characterized in that: The cover plate (3) is provided with a plurality of cover plate connecting rod holes (301), the bottom plate (5) is provided with a plurality of bottom plate connecting rod holes (501), and the plurality of connecting rods (2) respectively pass through the corresponding cover plate connecting rod holes (301) and bottom plate connecting rod holes (501).

4. The polymer expansion performance testing device with variable stiffness constraint function according to claim 3 is characterized in that: The cover plate (3) is also provided with a cover plate threaded rod hole (302) extending therethrough. The cover plate threaded rod hole (302) is used to allow the threaded rod (4) to pass through, and the inner diameter of the cover plate threaded rod hole (302) is greater than the outer diameter of the threaded rod (4).

5. The polymer expansion performance testing device with variable stiffness constraint function according to claim 1, characterized in that: The bottom plate (5) is provided with a bottom plate grouting hole (502) for connecting to a grouting pipe (6).

6. The polymer expansion performance testing device with variable stiffness constraint function according to claim 2, characterized in that: One end of each connecting rod (2) that passes through the cover plate (3) is a connecting rod threaded end (201), and each connecting rod threaded end (201) is connected and fixed to the cover plate (3) via a first nut (7).

7. The polymer expansion performance testing device with variable stiffness constraint function according to claim 1, characterized in that: The threaded rod (4) is also sleeved with two second nuts (8), and the two second nuts (8) are respectively arranged at the upper and lower parts of the cover plate (3).

8. The polymer expansion performance testing device with variable stiffness constraint function according to claim 1, characterized in that: A grouting pipe hole plug (601) is also provided at the end of the grouting pipe (6).

9. The polymer expansion performance testing device with variable stiffness constraint function according to any one of claims 1 to 8, characterized in that: The cover plate (3), tray (9), flat-bottom spring (10) and piston (11) are all detachable.

Images