Anti-freezing reinforcing pier performance test system

Abstract

The invention discloses an anti-freezing reinforcing pier performance testing system, which belongs to the field of concrete testing, and comprises a top-bottom two-end pressure applying module for applying pressure to the top end and the bottom end of a reinforcing pier at the same time to simulate the stress condition; the circumferential side surface pressure applying module is used for applying different pressures to simulate the stress condition through the side surface of the reinforcing pier; the freezing module is used for simulating the freezing condition by arranging a freezing pipeline on the outer side of the circumferential side surface pressure applying module; and the sensor monitoring module is used for monitoring the applied pressure and freezing temperature in real time and transmitting the temperature to the upper computer for data collection. Pressure is applied to the upper end, the lower end and the circumferential side face of the reinforcing pier, the actual pressure borne by the reinforcing pier is simulated, the actual freezing effect is simulated in cooperation with the freezing module, the compression resistance and anti-freezing performance of the reinforcing pier are fully tested, and the detection effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete testing, and particularly relates to a performance testing system for freeze-resistant reinforcement piers. Background Art

[0002] In strata containing humus soil, soft soil, seasonal frozen soil, etc., they have characteristics such as large water content and large void ratio, are typical soft soils, have poor engineering properties, are prone to settlement and damage when the roadbed passes through, and are prone to diseases such as frost heaving and boiling of the roadbed under the combined action of moisture and cold climate. Shallow soft soil solidification is a technical means for improving the engineering properties of shallow soft soil foundations, and the engineering properties of shallow soft soil are improved by the construction method of using reinforcement piers (dry / wet operation) + surrounding strata in the composite foundation.

[0003] The reinforcement piers for reinforcement have good load-bearing performance and good freeze-resistant performance. During the construction process, it is necessary to detect the performance of the solidification piers. Generally, core samples are taken on-site to detect their compressive strength. The existing detection devices cannot simulate their actual stress and cooling environment, cannot fully detect the performance of the reinforcement piers, and the detection is not accurate enough. Summary of the Invention

[0004] The purpose of the present invention is to provide a performance testing system for freeze-resistant reinforcement piers, which applies pressure to the upper and lower ends and the circumferential side surface of the reinforcement pier, simulates the actual pressure received by the reinforcement pier, and cooperates with the freezing module to simulate the actual freezing effect, fully tests the compressive and freeze-resistant performance of the reinforcement pier, and improves the detection effect.

[0005] To achieve the above purpose, the present invention provides a performance testing system for freeze-resistant reinforcement piers, including a top and bottom end pressure application module, which simultaneously applies pressure to the top and bottom ends of the reinforcement pier to simulate the stress condition; A circumferential side surface pressure application module, which applies different pressures to the side surface of the reinforcement pier to simulate the stress condition; A freezing module, which simulates the freezing condition by arranging freezing pipes outside the circumferential side surface pressure application module; A sensor monitoring module, which monitors the applied pressure and the freezing temperature in real time and transmits the data to the host computer for data collection.

[0006] Preferably, the top and bottom end pressure application module includes a base, the base is connected to the top plate through support columns, a hydraulic cylinder I is arranged on the base, a hydraulic cylinder II is arranged on the top plate, the hydraulic rod of the hydraulic cylinder I is connected to a pressure application block I, and the hydraulic rod of the hydraulic cylinder II is connected to a pressure test block II.

[0007] Preferably, a reinforcement pier specimen for testing is arranged between the pressure application block I and the pressure test block II.

[0008] Preferably, the circumferential side pressure application module includes a number of identical arc-shaped pressure plates distributed on the circumferential side of the reinforced pier specimen. The cylindrical surface formed by connecting the inner sides of the arc-shaped pressure plates in sequence is adapted to the circumferential side of the reinforced pier.

[0009] Preferably, a hydraulic cylinder III is connected to the outer side of each arc-shaped pressure plate. The hydraulic cylinder III is arranged on a fixed seat, and the fixed seat is arranged on the base. The hydraulic rod of the hydraulic cylinder III is connected to the outer side of the arc-shaped pressure plate.

[0010] Preferably, the freezing module includes a first freezing pipe arranged at the lower part of the reinforced pier and a second freezing pipe arranged at the upper part of the reinforced pier. The second freezing pipe is connected to the top plate through a lifting structure.

[0011] Preferably, the bottom end of the first freezing pipe is connected to the top end of the base through an annular support seat, and the first freezing pipe is filled with a freezing liquid.

[0012] Preferably, the lifting structure includes a hydraulic cylinder IV. The hydraulic cylinder IV is arranged at the top end of the top plate. The hydraulic rod of the hydraulic cylinder IV penetrates through the top plate and is connected to the top end of the connecting seat. The second freezing pipe is arranged at the bottom end of the connecting seat.

[0013] Preferably, the sensor module includes a pressure sensor for monitoring the pressure condition of the reinforced pier and a temperature sensor for monitoring the freezing temperature of the reinforced pier. The temperature sensor and the pressure sensor are distributed on the first pressure block, the second pressure block and the arc-shaped pressure plate.

[0014] Preferably, the reinforced pier includes a steel bar skeleton and filled concrete. The steel bar skeleton includes longitudinal steel bars and stirrups. An anti-freezing layer is arranged on the outer side of the steel bar skeleton, and an anti-freezing layer is arranged on the inner side of the steel bar skeleton. The anti-freezing layer is an extruded polystyrene foam board, which is on the outermost layer of the concrete of the reinforced pier. A water repellent coating is applied to the outer layer of the extruded polystyrene foam board. The anti-freezing layer is a polyurethane foam insulation layer, and glass fibers are filled in the concrete.

[0015] Therefore, by adopting the above anti-freezing type reinforced pier performance testing system, the present invention has the following beneficial effects: (1) By the top and bottom pressure application modules and the circumferential side pressure application module of the present invention, different pressures can be applied to the upper and lower ends and the circumferential side of the reinforced pier, simulating the actual stress conditions received by the reinforced pier, and cooperating with the freezing module to simulate the actual freezing conditions, fully testing the compressive and anti-freezing performances of the reinforced pier and improving the accuracy of detection; (2) By arranging the anti-freezing layer and the anti-freezing layer on the outer layer and the inner layer of the reinforced pier, the overall anti-freezing effect of the reinforced pier and the anti-freezing effect of the concrete inside the reinforced pier are improved, and glass fibers are filled in the concrete to improve its anti-freezing property and the performance of preventing cracking.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0017] Figure 1 It is a front structural schematic diagram of an embodiment of a performance test system for an anti-freezing reinforced pier of the present invention; Figure 2 It is a top view of the circumferential side pressure application module of an embodiment of a performance test system for an anti-freezing reinforced pier of the present invention; Figure 3 It is a schematic diagram of the steel bar skeleton of the reinforced pier in the embodiment of the present invention.

[0018] Reference Signs 1. Reinforced pier specimen; 2. Base; 3. Top plate; 4. Hydraulic cylinder I; 5. Hydraulic cylinder II; 6. Pressure application block I; 7. Pressure application block II; 8. Arc surface pressure plate; 9. Hydraulic cylinder III; 10. Fixed seat; 11. Freezing pipe I; 12. Freezing pipe II; 13. Ring support seat; 14. Hydraulic cylinder IV; 15. Connection seat; 16. Longitudinal steel bar; 17. Stirrup. Detailed Embodiment

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout.

[0020] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or server that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0021] Similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Embodiment As Figure 1 、 Figure 2 As shown, a performance test system for an anti-freezing reinforced pier according to the present invention includes a top and bottom pressure application module, which simultaneously applies pressure to the top and bottom of the reinforced pier to simulate the stress situation; a circumferential side pressure application module, which applies different pressures to the side of the reinforced pier to simulate the stress situation; a freezing module, which simulates the freezing situation by arranging freezing pipes outside the circumferential side pressure application module; and a sensor monitoring module, which monitors the applied pressure and the temperature of freezing in real time and transmits the data to the host computer for data collection.

[0025] The top and bottom pressure application module includes a base 2, and the base 2 is connected to a top plate 3 through support columns. A hydraulic cylinder 1 4 is arranged on the base 2, and a hydraulic cylinder 2 5 is arranged on the top plate 3. The hydraulic rod of the hydraulic cylinder 1 4 is connected to a pressure application block 1 6, and the hydraulic rod of the hydraulic cylinder 2 5 is connected to a test pressure block 2. A reinforced pier specimen 1 for testing is arranged between the pressure application block 1 6 and the test pressure block 2. The hydraulic cylinder 1 4 and the hydraulic cylinder 2 5 respectively drive the pressure application block 1 6 and the test pressure block 2 to squeeze the reinforced pier specimen 1, and apply pressure to the upper and lower ends of the reinforced pier specimen 1.

[0026] The circumferential side pressure application module includes a number of arc-shaped pressure plates 8 distributed on the circumferential side of the reinforced pier specimen 1. The cylindrical surface formed by connecting the inner sides of the number of arc-shaped pressure plates 8 in sequence is adapted to the circumferential side of the reinforced pier. A hydraulic cylinder 3 9 is connected to the outside of each arc-shaped pressure plate 8. The hydraulic cylinder 3 9 is arranged on a fixed seat 10, and the fixed seat 10 is arranged on the base 2. The hydraulic rod of the hydraulic cylinder 3 9 is connected to the outside of the arc-shaped pressure plate 8. The multiple hydraulic cylinders 3 9 act together to drive the arc-shaped pressure plate to apply the same or different pressures to the circumferential side of the reinforced pier specimen 1.

[0027] The freezing module includes a first freezing pipe 11 arranged at the lower part of the reinforcement pier and a second freezing pipe 12 arranged at the upper part of the reinforcement pier. The second freezing pipe 12 is connected to the top plate 3 through a lifting structure. The bottom end of the first freezing pipe 11 is connected to the top end of the base 2 through an annular support seat 13, and the first freezing pipe 11 is filled with a freezing liquid. The lifting structure includes a fourth hydraulic cylinder 14 arranged at the top end of the top plate 3. The hydraulic rod of the fourth hydraulic cylinder 14 penetrates through the top plate 3 and is connected to the top end of the connecting seat 15. The second freezing pipe 12 is arranged at the bottom end of the connecting seat 15.

[0028] The sensor module includes a pressure sensor for monitoring the pressure on the reinforcement pier and a temperature sensor for monitoring the freezing temperature of the reinforcement pier. The temperature sensor and the pressure sensor are distributed on the first pressing block 6, the second pressing block 7 and the arc-shaped pressure plate.

[0029] The reinforcement pier includes a steel bar skeleton and filled concrete. As Figure 3 shown, the steel bar skeleton includes longitudinal steel bars 16 and stirrups 17. The steel bar skeleton of the reinforcement pier adopts the steel bar skeleton of an existing concrete pier. An anti-freezing layer is arranged on the outer side of the steel bar skeleton, and an anti-freezing layer is arranged on the inner side of the steel bar skeleton. The anti-freezing layer is an extruded polystyrene foam board (XPS), and the extruded polystyrene foam board is on the outermost layer of the concrete of the reinforcement pier. The XPS board has good heat insulation performance, and has good compressive strength and water resistance. When applied in the anti-freezing layer of the concrete pile, it can more effectively prevent heat dissipation and water intrusion, and can be fixed on the surface of the pile body by means such as pasting or hoop. The thickness is between 30mm and 80mm. A water-repellent agent coating is applied to the outer layer of the extruded polystyrene foam board. Applying a water-repellent agent, such as a silicone-based water-repellent agent, on the surface of the concrete pile can form a water-repellent film on the concrete surface to prevent water from invading the interior of the concrete, thereby improving the anti-freezing performance of the concrete. The construction of the water-repellent agent coating is convenient and can be applied after the construction of the concrete pile is completed. The formed water-repellent film can effectively reduce the water absorption rate of the concrete and improve its anti-freezing durability. The anti-freezing layer is a polyurethane foam insulation layer. The polyurethane foam has excellent heat insulation and waterproof performance, and has a high closed-cell rate, which can effectively prevent water penetration and play a good protective role for the internal concrete. Glass fibers are filled in the concrete, which can improve the crack resistance of the concrete and enhance the anti-freezing ability of the concrete to a certain extent. The glass fibers are evenly distributed in the concrete, which can prevent the generation and expansion of cracks, reduce the channels of water in the interior of the concrete, and thereby improve the anti-freezing performance of the concrete.

[0030] During use, first place the reinforced pier specimen 1 in the middle of the pressure block 1 6. The hydraulic cylinder 2 5 drives the pressure block 2 7 to descend, and the pressure block 2 7 presses on the reinforced pier specimen 1 to position it. Then, multiple hydraulic cylinders 3 9 act simultaneously to drive the arc-shaped pressure plate to extend forward and apply pressure to the circumferential side surface of the reinforced pier specimen 1. The first freezing pipe 11 and the second freezing pipe 12 are both spirally arranged outside the arc-shaped pressure plate and will not affect the forward and backward movement of the arc-shaped pressure plate. Both the first freezing pipe 11 and the second freezing pipe 12 are provided with inlets and outlets. First, seal the outlets, add a freezing liquid (such as liquid nitrogen) through the inlets, and then seal the inlets. While applying pressure, freeze it to simulate the actual stress and freezing effects, and use temperature sensors and pressure sensors to collect data in real time through the upper computer. After the test is completed, take out the reinforced pier specimen 1, observe and detect the appearance and internal conditions of the reinforced pier specimen 1, and analyze the compressive and frost resistance properties of the reinforced pier in combination with the data collected by the upper computer.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An anti-freezing reinforced pier performance testing system, characterized in that: including a top-bottom pressure application module that simulates the stress condition by applying pressure to the top and bottom ends of the reinforcement pier simultaneously; a circumferential side pressure application module that simulates the stress condition by applying different pressures to the side of the reinforcement pier; a freezing module that simulates the freezing condition by arranging freezing pipes outside the circumferential side pressure application module; a sensor monitoring module that monitors the applied pressure and the freezing temperature in real time and transmits the data to the host computer for data collection.

2. The anti-freezing reinforced pier performance testing system according to claim 1, characterized in that: The top-bottom pressure application module includes a base (2), the base (2) is connected to a top plate (3) through support columns, a hydraulic cylinder one (4) is arranged on the base (2), a hydraulic cylinder two (5) is arranged on the top plate (3), the hydraulic rod of the hydraulic cylinder one (4) is connected to a pressure application block one (6), and the hydraulic rod of the hydraulic cylinder two (5) is connected to a pressure test block two.

3. The performance testing system for an anti-freezing reinforced pier according to claim 2, wherein: A reinforcement pier specimen (1) for testing is arranged between the pressure application block one (6) and the pressure test block two (7).

4. An anti-freezing type reinforced pier performance testing system according to claim 3, characterized in that: The circumferential side pressure application module includes a number of arc-shaped pressure plates (8) distributed on the circumferential side of the reinforcement pier specimen (1). The cylindrical surface formed by connecting the inner sides of the several arc-shaped pressure plates (8) in sequence is adapted to the circumferential side of the reinforcement pier.

5. The performance testing system for an anti-freezing reinforced pier according to claim 4, wherein: A hydraulic cylinder three (9) is connected to the outside of each arc-shaped pressure plate (8). The hydraulic cylinder three (9) is arranged on a fixed seat (10), the fixed seat (10) is arranged on the base (2), and the hydraulic rod of the hydraulic cylinder three (9) is connected to the outside of the arc-shaped pressure plate (8).

6. The performance testing system for an anti-freezing reinforced pier according to claim 2, characterized in that: The freezing module includes a freezing pipe one (11) arranged at the lower part of the reinforcement pier and a freezing pipe two (12) arranged at the upper part of the reinforcement pier. The freezing pipe two (12) is connected to the top plate (3) through a lifting structure.

7. An anti-freezing type reinforced pier performance testing system according to claim 6, characterized in that: The bottom end of the freezing pipe one (11) is connected to the top end of the base (2) through an annular support seat (13), and the freezing pipe one (11) is filled with a freezing liquid.

8. The performance testing system for an anti-freezing reinforced pier according to claim 6, characterized in that: The lifting structure includes a hydraulic cylinder four (14). The hydraulic cylinder four (14) is arranged at the top end of the top plate (3). The hydraulic rod of the hydraulic cylinder four (14) penetrates through the top plate (3) and is connected to the top end of a connecting seat (15). The freezing pipe two (12) is arranged at the bottom end of the connecting seat (15).

9. The performance testing system for an anti-freezing reinforced pier according to claim 5, characterized in that: The sensor module includes a pressure sensor for monitoring the pressure condition of the reinforcement pier and a temperature sensor for monitoring the freezing temperature of the reinforcement pier. The temperature sensor and the pressure sensor are distributed on the pressure application block one (6), the pressure test block two (7) and the arc-shaped pressure plates.

10. The performance testing system for an anti-freezing reinforced pier according to claim 1, characterized in that: The reinforcement pier includes a steel bar skeleton and filled concrete. The steel bar skeleton includes longitudinal steel bars (16) and stirrups (17). An anti-freezing layer is arranged on the outside of the steel bar skeleton, and an anti-freezing layer is arranged on the inside of the steel bar skeleton. The anti-freezing layer is an extruded polystyrene foam board, which is on the outermost layer of the reinforcement pier concrete. A water-repellent agent coating is applied to the outer layer of the extruded polystyrene foam board. The anti-freezing layer is a polyurethane foam insulation layer, and glass fibers are filled in the concrete.

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