A foam material expansion force testing device

Abstract

The present invention provides a device for testing the expansion force of a foaming material, comprising: a foaming reaction system, including a reaction tube, a reaction tube cover, and a fixed frame for pressing the reaction tube; a loading system, including a reaction frame, a lever crossbeam hinged to the reaction frame, a weight plate provided at one end of the lever crossbeam, a counterweight provided at the other end, and a force transmission rod provided on the lever crossbeam; a measurement system, including a displacement detection device, a pressure detection device, a data acquisition instrument, and a personal computer; a test bench, including a support and a table top, the table top being provided with a limit groove that cooperates with the bottom of the reaction tube; the foaming reaction system is arranged on the test bench, the reaction tube, the reaction cover, and the table top forming a reaction chamber, the table top being provided with a grouting hole, and a grouting head provided in the grouting hole; the loading system is arranged directly above the foaming reaction system, and the force transmission rod is detachably connected to the reaction tube cover. The present invention can quickly and accurately measure the expansion force of a foaming material under different constraint loads, thereby improving the accuracy of engineering repair.

Description

Technical Field

[0001] The invention relates to the research field of engineering material mechanical property testing technology, and in particular to a foam material expansion force testing device. Background Art

[0002] my country's infrastructure construction is huge, with numerous existing and under-construction roads, railways, bridges, dams and other infrastructure. With aging, disrepair and the influence of natural factors, various engineering defects are also occurring. In recent years, non-aqueous reactive foamed polyurethane grouting materials have been widely used in emergency rescue and repair and reinforcement of foundation projects due to their characteristics of no water reaction, early strength, large expansion force and strong durability. Among the many engineering defects, the sinking of roads, airport pavements, underground pipelines, channel plates and high-speed rail track plates is the most common and the most harmful. The traditional method is to perform foamed polyurethane grouting to lift the defect location, but the expansion force parameters of the foamed polyurethane must be obtained in advance to improve the accuracy of the lifting height. However, the existing measurement method is to grout in a closed container and measure the expansion force of the foamed polyurethane by installing an earth pressure box inside the upper cover of the reaction container. This ignores the constraints of the upper load and does not conform to the actual engineering situation. In addition, the accuracy of the existing earth pressure box and the accuracy of the measurement results need to be considered.

[0003] The prior art discloses a method for testing the lateral pressure of a grouting filling material under deadweight load (CN104897884B). The testing device used includes a test box, a lateral pressure data acquisition system, and a test box deformation measurement bracket. The test box is a cubic structure with sealed side walls and upper and lower openings. The lower opening of the test box is sealed and connected to a lower cover plate. The lateral pressure data acquisition system includes multiple pressure sensors, a pressure patrol meter, and a power supply. The test box deformation measurement bracket includes a first fixed bracket and a second fixed bracket. A horizontal steel wire rope is connected between a first connecting ring on the first fixed bracket and a second connecting ring on the second fixed bracket. A plumb line is connected to the horizontal steel wire rope, and a mass is connected to the bottom of the plumb line. The method provided by this invention can measure the lateral pressure value of the formwork. However, in actual engineering applications, the grouting filling material needs to withstand the additional load of gravity. Under different loads, the expansion parameters of the grouting filling material are the basis for ensuring accurate repair of the project. However, this invention cannot test the expansion parameters of the grouting filling material under different loads.

[0004] Therefore, there is an urgent need for a device that can quickly and accurately measure the expansion force of foam materials under different constraint loads. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a foam material expansion force testing device, which can quickly and accurately measure the expansion force of foam materials under different constraint loads, thereby improving the accuracy of engineering repairs.

[0006] In order to achieve the above object, the present invention provides a foam material expansion force testing device, comprising:

[0007] The foaming reaction system comprises a reaction tube, a reaction tube cover slidably sleeved with the inner wall of the reaction tube, and a fixing frame pressed with the reaction tube;

[0008] The loading system includes a reaction frame for fixed support, a lever beam hinged to the reaction frame, a weight plate at one end of the lever beam away from the hinge point, a counterweight at the other end, and a force transmission rod on the lever beam;

[0009] The measurement system includes a displacement detection device for detecting the sliding distance of the reaction tube cover, a pressure detection device for detecting the expansion force of the foaming material, a data acquisition device, and a PC. The displacement detection device and the pressure detection device are respectively connected to the data acquisition device via data cables, and the data acquisition device is electrically connected to the PC.

[0010] The test bench comprises a support and a table top, wherein the table top is provided with a limiting groove that matches the bottom of the reaction cylinder;

[0011] The foaming reaction system is arranged on the test bench, and the reaction tube, reaction cover and table top form a reaction chamber. Correspondingly, a grouting hole for injecting foaming material into the reaction chamber is provided at a position on the table top corresponding to the bottom of the reaction tube, and a grouting head is provided in the grouting hole; the loading system is arranged directly above the foaming reaction system, and the force transmission rod is detachably connected to the reaction tube cover.

[0012] Preferably, the fixing frame includes a fixing ring and a reaction tube fixing screw, one end of the reaction tube fixing screw is connected to the table top, and the other end of the reaction tube fixing screw is detachably connected to the fixing ring, and the fixing ring is buckled on the upper end surface of the reaction tube, so that the reaction tube is fixedly connected to the table top.

[0013] Preferably, there are at least two fixing screws of the reaction barrel, and screw holes connected to the fixing screws of the reaction barrel are evenly provided on the fixing ring.

[0014] Preferably, the other end of the fixing screw of the reaction cylinder is detachably connected to the fixing ring through a thread.

[0015] Preferably, the fixing ring is provided with a pressing groove that matches the upper end surface of the reaction cylinder.

[0016] Preferably, a sealing ring groove is provided on the side of the reaction cylinder cover that contacts the reaction cylinder wall, and a sealing ring is provided in the sealing ring groove to prevent the slurry from overflowing.

[0017] Preferably, the reaction cylinder cover is provided with an exhaust hole in the thickness direction, and an exhaust valve is provided on the exhaust hole.

[0018] Preferably, the thickness of the reaction tube cover is 2 cm.

[0019] Preferably, the inner diameter of the inner wall of the reaction cylinder is divided into two sections, the inner diameter of the end in contact with the table is a first inner diameter, and the end away from the table is a second inner diameter. The second inner diameter is larger than the first inner diameter to ensure that there is a certain space between the reaction cylinder cover and the bottom of the reaction cylinder to prevent the foaming material from crystallizing due to uneven mixing, which affects the measurement of the expansion force.

[0020] Preferably, the reaction frame includes a reaction beam and two reaction screws, the two reaction screws and the reaction beam are connected end to end in sequence to form a door-shaped frame, and one end of the two reaction screws is respectively connected to the table top.

[0021] Preferably, the lever beam is hinged to the reaction beam with a distance between the hinge points, a lug is provided on the lever beam, and one end of the force transmission rod is connected to the lug via a ball joint.

[0022] Preferably, the other end of the force transmission rod is detachably connected to the reaction cylinder cover via a thread.

[0023] Preferably, a displacement detection device sensing frame is provided in the middle of the force transmission rod.

[0024] Preferably, the pressure detection device is provided on the surface of the reaction cylinder cover in contact with the foaming slurry, so that the detection of the expansion force of the foaming material is more accurate.

[0025] Preferably, the displacement detection device is arranged on the fixing ring through a fixing bracket. Correspondingly, a fixing bracket mounting hole is provided on the fixing ring, and a displacement detection device mounting hole is provided on the fixing bracket.

[0026] Preferably, the displacement detection device is a displacement meter, the pressure detection device is a pressure sensor, the pressure sensor has an accuracy of 0.01 MPa and a measuring range of 10 MPa, and the displacement meter has an accuracy of 0.01 mm and a measuring range of 150 mm.

[0027] Preferably, the grouting head is of elbow type, one end of the grouting head is detachably connected to the grouting hole, and the other end of the grouting head is provided with a control valve, which is connected to the grouting machine.

[0028] Since the present invention adopts the above technical solution, the beneficial effects of this application are:

[0029] 1. A foam material expansion force testing device of the present invention can measure the expansion force of foam materials under different fixed constraints under a loading system; through the connection of a displacement detection device, a pressure detection device, a data acquisition instrument and a PC, real-time measurement of the expansion force and vertical displacement of the foam material is achieved; and the device is simple to manufacture, easy to operate, highly accurate, low-cost, and economical and practical.

[0030] 2. The loading system of a foam material expansion force testing device of the present invention includes a reaction frame for fixed support and a lever beam hinged to the reaction frame, wherein the lever beam is provided with a weight plate at one end away from the hinge point and a counterweight at the other end, and a force transmission rod is provided on the lever beam; the reaction frame includes a reaction beam and two reaction screws, and the two reaction screws and the reaction beam are connected end to end in sequence to form a door-shaped frame, so that the loading system of the present invention constitutes a lever principle loading, with simple structural assembly and precise loading of weights to ensure the accuracy of the measurement results. At the same time, it can realize the test of the expansion force and vertical displacement of the foam material under different fixed loads according to the loading of different weights.

[0031] 3. A foam material expansion force testing device of the present invention has one end of a force transmission rod and a ball joint with a lever beam to ensure that the force transmission rod can move vertically up and down, and the other end of the force transmission rod is connected to the reaction cylinder cover by a threaded bolt, so that after the experiment is completed, it is convenient to remove and clean the foam material, so that the device provided by the present invention can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a cross-sectional view of a foam material expansion force testing device according to the present invention;

[0034] Figure 2 A top view of the fixing ring of the present invention;

[0035] Figure 3 A top view of the test bench of the present invention;

[0036] The reference numerals are as follows:

[0037]

[0038] DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] The present invention will be further described below with reference to the accompanying drawings:

[0041] Reference Figure 1 、 Figure 2 and Figure 3 The present invention provides a foam material expansion force testing device, comprising:

[0042] The foaming reaction system 1 includes a reaction tube 11, a reaction tube cover 12 that is slidably sleeved with the inner wall of the reaction tube 11, and a fixing frame 13 that is pressed against the reaction tube 12;

[0043] The loading system 2 includes a reaction frame 21 for fixed support, a lever beam 22 hinged to the reaction frame 21, a weight plate 221 at one end of the lever beam 22 away from the hinge point, a counterweight 222 at the other end, and a force transmission rod 23 on the lever beam 22;

[0044] The measuring system 3 includes a displacement detection device 31 for detecting the sliding distance of the reaction tube cover 12, a pressure detection device 32 for detecting the expansion force of the foaming material, a data acquisition device 33, and a PC 34. The displacement detection device 31 and the pressure detection device 32 are respectively connected to the data acquisition device 33 via a data line 35, and the data acquisition device 33 is electrically connected to the PC 34.

[0045] The test bench 4 includes a support 41 and a table 42. The table 42 is provided with a limiting groove 421 that cooperates with the bottom of the reaction cylinder 11 to limit the position of the reaction cylinder 11 to prevent it from shifting during the test and causing the slurry to overflow.

[0046] The foaming reaction system 1 is mounted on a test bench 4. The reaction tube 11, reaction cover 12, and table 42 form a reaction chamber. Correspondingly, a grouting hole 422 for injecting foaming material into the reaction chamber is provided on the table 42 at a position corresponding to the bottom of the reaction tube 11. A grouting head 5 is located within the grouting hole 422. The loading system 2 is positioned directly above the foaming reaction system 1, and the force transmission rod 23 is detachably connected to the upper end of the reaction tube cover 12. This device can measure the expansion force of the foaming material under different fixed constraints imposed by the loading system 2. Real-time measurement of the expansion force and vertical displacement of the foaming material is achieved by connecting the displacement detection device 31, the pressure detection device 32, and the data acquisition device 33 to a PC 34. The device is simple to manufacture, easy to operate, highly accurate, low-cost, and economical and practical.

[0047] It should be noted that the inner wall of the reaction tube 11 and the limiting groove 421 are sealed by tolerance matching.

[0048] As a preferred embodiment, refer to Figure 1 The fixing frame 13 includes a fixing ring 131 and a reaction tube fixing screw 132. One end of the reaction tube fixing screw 132 is connected to the table 42, and the other end of the reaction tube fixing screw 132 is detachably connected to the fixing ring 131. The fixing ring 131 is buckled on the upper end surface of the reaction tube 11, so that the reaction tube 11 is fixedly connected to the table 42.

[0049] As a preferred embodiment, there are at least two reaction tube fixing screws 132, and the fixing ring 131 is evenly provided with screw holes 1312 connected to the reaction tube fixing screws 132. In this embodiment, the number of reaction tube fixing screws 132 is four. Figure 2 Four screw holes 1312 connected to the reaction tube fixing screw 132 are evenly provided on the fixing ring 131 , and four first connecting holes 423 connected to the other end of the reaction tube fixing screw 132 are also evenly provided on the table 42 .

[0050] As a preferred embodiment, refer to Figure 1 The other end of the reaction tube fixing screw 132 is detachably connected to the fixing ring 131 through a thread, and a locking nut is provided on it.

[0051] As a preferred embodiment, a pressing groove is provided on the fixing ring 131 to match the upper end surface of the reaction cylinder 11, so that the fixing ring 131 is firmly pressed and not easily deviated.

[0052] As a preferred embodiment, a sealing ring groove is provided on the side of the reaction cylinder cover 12 that contacts the cylinder wall of the reaction cylinder 11 , and a sealing ring 14 is provided in the sealing ring groove to prevent the slurry from overflowing.

[0053] As a preferred embodiment, the reaction tube cover 12 is provided with an exhaust hole in the thickness direction, and an exhaust valve 15 is provided on the exhaust hole.

[0054] As a preferred embodiment, the thickness of the reaction tube cover 12 is 2 cm.

[0055] As a preferred embodiment, the inner diameter of the inner wall of the reaction tube 11 is divided into two sections. The inner diameter of the end in contact with the table 42 is a first inner diameter, and the end away from the table 42 is a second inner diameter. The second inner diameter is larger than the first inner diameter to ensure that there is a certain space between the reaction tube cover 12 and the bottom of the reaction tube 11 to prevent the foaming material from crystallizing due to uneven mixing, which affects the measurement of the expansion force.

[0056] As a preferred embodiment, the reaction frame 21 includes a reaction beam 211 and two reaction screws 212. The two reaction screws 212 and the reaction beam 211 are connected end to end in sequence to form a door-shaped frame. One end of the two reaction screws 212 is respectively connected to the second connection hole 424 on the table 42. In this embodiment, the two ends of the force beam 211 are connected to the two reaction screws 212 in a threaded connection manner, and a locking nut for tightening is provided at both ends, so that the reaction frame 21 can firmly support the loading system 2.

[0057] As a preferred embodiment, the lever beam 22 is hinged to the reaction beam 211, and the hinge points are spaced apart. A support ear 223 is provided on the lever beam 22, and one end of the force transmission rod 23 is spherically hinged with the support ear 223 to ensure that the force transmission rod 23 can move vertically up and down. The other end of the force transmission rod 23 is bolted to the reaction cylinder cover 12 through a thread, so that after the experiment is completed, the entire device can be easily dismantled and the foaming material can be cleaned, so that the device provided by the present invention can be reused.

[0058] As a preferred embodiment, refer to Figure 1 A displacement detection device sensing frame 231 is provided in the middle of the force transmission rod 23, making the test device compact.

[0059] As a preferred embodiment, the pressure detection device 32 is positioned on the surface of the reaction tube cover 12 that contacts the foaming slurry, directly contacting the foaming material for more accurate expansion force detection. It should be noted that the data line 35 of the pressure detection device 32 is led out of the reaction tube cover 12 through a sealing rubber plug 36 to prevent the slurry from overflowing from the data line hole.

[0060] As a preferred embodiment, the displacement detection device 31 is arranged on the fixing ring 131 through a fixing bracket. Correspondingly, the fixing ring 131 is provided with a fixing bracket mounting hole 1311 , and the fixing bracket is provided with a displacement detection device mounting hole.

[0061] As a preferred embodiment, the displacement detection device 31 is a displacement meter, and the pressure detection device 32 is a pressure sensor. The pressure sensor has an accuracy of 0.01MPa and a range of 10MPa. The displacement meter has an accuracy of 0.01mm and a range of 150mm, ensuring the measurement accuracy of vertical displacement and expansion force.

[0062] As a preferred embodiment, the grouting head 5 is of elbow type to buffer the grouting pressure. One end of the grouting head 5 is detachably connected to the grouting hole, and the other end of the grouting head 5 is provided with a control valve, which is connected to the grouting machine.

[0063] As a preferred embodiment, the weight plate 221, lever beam 22, reaction frame 21, reaction tube 11, reaction tube fixing screw 132, reaction screw 212, reaction tube cover 12, table 42 and grouting head 5 are all made of stainless steel to prevent the testing device from rusting and enhance the life of the device.

[0064] The operation and use process of the present invention is as follows:

[0065] Step 1: First, assemble the reaction frame 21 and the lever beam 22 as required, then apply a layer of grease to the inner wall of the reaction cylinder 11 for lubrication, place the reaction cylinder 11 into the limit groove 421 on the panel 42 of the test bench 4, and fix the reaction cylinder 11 on the panel 42 of the test bench 4 with the reaction cylinder fixing screw 132, nut and fixing ring 131;

[0066] Step 2: Install the fixed bracket of the displacement detection device 31 into the fixed bracket mounting hole 1311 on the fixing ring 131, connect the force transmission rod 23 and the reaction tube cover 12, put the sealing ring 14 around the reaction tube cover 12, and place the reaction tube cover 12 in the reaction tube 11. Adjust the displacement detection device 31 so that it contacts the displacement detection device sensing frame in the middle of the force transmission rod 23;

[0067] Step 3: Connect the displacement detection device 31 and the pressure detection device 32 to the data acquisition device 33 and the PC 34 via the data line 35, and adjust the acquisition software in the PC 34;

[0068] Step 4: open the exhaust valve 15 and the control valve of the grouting head 5, add a preset weight in the weight disk 221, calculate the grouting amount required for the test, and then grout from the grouting head 5 into the reaction tube 11 through the grouting equipment. At the same time, click on the PC data acquisition software to start collecting data. After grouting is completed, close the control valve at the grouting head 5. When the exhaust valve 15 of the reaction tube cover 12 is about to have slurry emerge, close the control valve of the grouting head 5. After the pressure detection device data is stable or reaches a score, reduce it for a period and stop the test;

[0069] Step 5: Repeat the above steps by changing the grouting amount and weight mass, so that the relationship between the expansion force and displacement and the constraint load and foaming material can be obtained, providing a reference for actual engineering.

[0070] The above is a detailed introduction to the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A foam material expansion force testing device, characterized in that: include: The foaming reaction system comprises a reaction tube, a reaction tube cover slidably sleeved with the inner wall of the reaction tube, and a fixing frame pressed with the reaction tube; The loading system includes a reaction frame for fixed support, a lever beam hinged to the reaction frame, a weight plate at one end of the lever beam away from the hinge point, a counterweight at the other end, and a force transmission rod on the lever beam; The measurement system includes a displacement detection device for detecting the sliding distance of the reaction tube cover, a pressure detection device for detecting the expansion force of the foaming material, a data acquisition device, and a PC. The displacement detection device and the pressure detection device are respectively connected to the data acquisition device via data cables, and the data acquisition device is electrically connected to the PC. The test bench comprises a support and a table top, wherein the table top is provided with a limiting groove that matches the bottom of the reaction cylinder; The foaming reaction system is arranged on the test bench, and the reaction cylinder, reaction cover and tabletop form a reaction chamber. Correspondingly, a grouting hole for injecting foaming material into the reaction chamber is provided at a position on the tabletop corresponding to the bottom of the reaction cylinder, and a grouting head is provided in the grouting hole; the loading system is arranged directly above the foaming reaction system, and the force transmission rod is detachably connected to the reaction cylinder cover; The reaction frame includes a reaction beam and two reaction screws, the two reaction screws and the reaction beam are connected end to end to form a door-shaped frame, so that the loading system constitutes a lever principle loading system; the lever beam is hinged to the reaction beam, with a distance between the hinge points, and the lever beam is provided with a support ear, and one end of the force transmission rod is ball-jointed to the support ear; The pressure detection device is arranged on the surface of the reaction cylinder cover in contact with the foaming slurry; the fixing frame includes a fixing ring, and the displacement detection device is arranged on the fixing ring through a fixing bracket, and the displacement detection device is adjusted to contact the displacement detection device sensing frame in the middle of the force transmission rod.

2. A foam material expansion force testing device according to claim 1, characterized in that: The fixing frame further comprises a reaction tube fixing screw, one end of which is connected to the table, and the other end of which is detachably connected to the fixing ring, which is buckled and pressed against the upper end surface of the reaction tube.

3. A foam material expansion force testing device according to claim 2, characterized in that: There are at least two fixing screws of the reaction barrel, and screw holes connected to the fixing screws of the reaction barrel are evenly arranged on the fixing ring.

4. A foam material expansion force testing device according to claim 2 or 3, characterized in that: The other end of the fixing screw of the reaction cylinder is detachably connected to the fixing ring through a thread.

5. A foam material expansion force testing device according to any one of claims 1 to 3, characterized in that: A sealing ring groove is provided on the side of the reaction tube cover that contacts the reaction tube wall, and a sealing ring is provided in the sealing ring groove.

6. A foam material expansion force testing device according to any one of claims 1 to 3, characterized in that: The reaction tube cover is provided with an exhaust hole in the thickness direction, and an exhaust valve is provided on the exhaust hole.

7. A foam material expansion force testing device according to any one of claims 1 to 3, characterized in that: The inner diameter of the inner wall of the reaction cylinder is divided into two sections. The inner diameter of the end in contact with the table is a first inner diameter, and the end away from the table is a second inner diameter, and the second inner diameter is larger than the first inner diameter.

8. A foam material expansion force testing device according to claim 1, characterized in that: One end of the two reaction screws is connected to the table top respectively.

9. A foam material expansion force testing device according to claim 2 or 3, characterized in that: The displacement detection device is arranged on the fixing ring through a fixing bracket. Correspondingly, a fixing bracket mounting hole is provided on the fixing ring, and a displacement detection device mounting hole is provided on the fixing bracket.

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