Experimental device for impacting and crushing concrete through water and liquid nitrogen circulation

Abstract

The utility model discloses an experimental device for impacting and crushing concrete through water and liquid nitrogen circulation, and relates to the technical field of engineering experimental equipment. The device structurally comprises an experiment box, a pressure tank, a booster pump, an air pump, a glove box, a heat preservation tank, a transparent protection baffle and a noise reduction exhaust window. The experiment box comprises four rectangular stand columns which are arranged in a rectangular shape; an upper platform and a lower platform are fixed to the upper end faces and the bottom faces of the four rectangular stand columns correspondingly. A concrete block supporting table is fixed to the middles of the four rectangular stand columns. The concrete block supporting table is provided with a row of water drainage channels. A row of threaded blind holes are formed in each of two outward side surfaces of the parts, between the upper platform and the concrete block supporting table, of the four rectangular stand columns; the front and rear side surfaces of the experiment box are respectively provided with a transparent protective baffle through handle bolts. According to the utility model, the crushing effect of concrete under the cyclic impact of water and liquid nitrogen is researched by accurately controlling experimental conditions, so that a scientific basis is provided for engineering application and the development of related technologies is promoted.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering experimental equipment, and particularly relates to an experimental device for cyclic impact crushing of concrete by water and liquid nitrogen. Background Technique

[0002] In the current rapidly developing infrastructure construction, concrete, as a commonly used building material, plays an important role in the repair and renovation of road surfaces and bridge decks. With the strengthening of environmental protection and resource recycling awareness, the traditional physical and mechanical crushing methods can no longer meet the needs of modern projects due to their disadvantages such as poor environmental protection, low crushing quality, high consumption of consumables, and damage to the original structure. Although the emerging high-pressure water jet technology has the advantages of no dust, no pollution, and selective concrete breaking, it has problems such as high equipment threshold and small effective cracking range. Therefore, the research on the flexible crushing technology combining the cryogenic degradation effect of liquid nitrogen and high-pressure water jet has become very promising.

[0003] Liquid nitrogen can reduce the temperature of concrete, thereby introducing thermal stress, embrittling the concrete, and increasing the possibility of its being broken. The crushing method combined with the cyclic impact of water and liquid nitrogen can not only reduce the working pressure and expand the cracking range, but also enhance the crushing effect mutually. However, at present, the research on this combined crushing method lacks an effective experimental device to systematically analyze and verify the crushing effect, especially under the actual working conditions of simulating extreme temperature and pressure conditions.

[0004] Therefore, it is particularly important to develop an experimental device that can simulate the actual working environment and can safely and effectively conduct the experiment of cyclic impact crushing of concrete by high-speed jets of liquid nitrogen and water. Content of the Utility Model

[0005] The purpose of the utility model is to provide an experimental device for cyclic impact crushing of concrete by water and liquid nitrogen, which can simulate the crushing effect of concrete under extreme temperature and pressure conditions through the rapid cooling of the liquid nitrogen injection system and the impact of the high-pressure water injection system.

[0006] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0007] The utility model relates to an experimental device for water and liquid nitrogen cyclic impact crushing of concrete, which comprises an experimental box, a pressure tank, a booster pump, an air pump, a sundry box, a heat preservation tank, a transparent protection baffle and a noise reduction exhaust window; the experimental box comprises four rectangular columns arranged in a rectangle; the upper end surfaces and the bottom surfaces of the four rectangular columns are respectively fixed with an upper platform and a lower platform; a concrete block support platform is fixed in the middle of the four rectangular columns; a row of drainage channels are arranged on the concrete block support platform; two side surfaces of the four rectangular columns, which are located between the upper platform and the concrete block support platform and face outwards, are respectively provided with a column of blind threaded holes; a transparent protection baffle is respectively installed on the front and rear side surfaces of the experimental box through a bolt with a handle; a noise reduction exhaust window is respectively installed on the left and right side surfaces of the experimental box through a bolt with a handle; an external threaded joint which is in threaded connection and cooperation with the heat preservation tank is fixed on the lower surface of the upper platform; a liquid nitrogen conduit with both ends downward is fixedly penetrated through the upper platform, and one end of the liquid nitrogen conduit passes through the external threaded joint and is placed at the inner bottom of the heat preservation tank, and the other end of the liquid nitrogen conduit is placed above the middle of the concrete block support platform; an air inlet conduit which is placed inside the external threaded joint is fixedly penetrated through the upper platform; the other end of the air inlet conduit is connected with the air outlet end of the air pump; a water inlet pipe is fixedly penetrated through the middle of the upper platform; the water inlet pipe is connected with the pressure tank; a solenoid valve pipeline valve is installed on the water inlet pipe; the booster pump and the pressure tank are connected through a first pipeline; a pressure switch is installed on the pressure tank; a vertically downward spray head is installed at the end of the water inlet pipe.

[0008] As a preferred technical solution of the utility model, a retaining wall is fixed at the edge of the upper surface of the concrete block support platform; a conical funnel is fixed at the lower surface of the concrete block support platform.

[0009] As a preferred technical solution of the utility model, the noise reduction exhaust window comprises a rectangular plate body; a column of air outlet holes in the vertical direction are arranged on the rectangular plate body; a wind guide plate which is arranged obliquely upwards is fixed on the outer side surface of the rectangular plate body at the lower end of the air outlet hole; two columns of round through holes which are in cooperation with the bolt with a handle are arranged on the rectangular plate body; a sponge sheet is fixed on the inner side surface of the rectangular plate body.

[0010] As a preferred technical solution of the utility model, a pressure gauge is installed at the upper end of the pressure tank.

[0011] As a preferred technical solution of the utility model, two parallel isolation baffles are fixed on the lower surface of the upper platform between the water inlet pipe and the liquid nitrogen conduit.

[0012] As a preferred technical solution of the utility model, the sundry box comprises a rectangular box with an upper opening; a lifting handle is respectively installed on one pair of opposite outer side surfaces of the rectangular box.

[0013] As a preferred technical solution of the present utility model, a row of support bars are fixed on a pair of opposite inner walls inside the rectangular box; a filter sheet is installed on the row of support bars; a drain pipe penetrates and is fixed on the outer wall of the lower end of the rectangular box, and a ball valve is installed on the drain pipe.

[0014] The present utility model has the following beneficial effects:

[0015] 1. Through the rapid cooling of the liquid nitrogen injection system and the impact of the high-pressure water injection system, the present utility model can simulate the crushing effect of concrete under extreme temperature and pressure conditions, which is of positive significance for studying the crushing effect of concrete blocks under the combination of high-pressure water flow and rapid cooling and for observing the macroscopic crushing results.

[0016] 2. The design of the device of the present utility model allows the alternating high-speed jets of liquid nitrogen and water, and can perform multiple cyclic impacts on the concrete block in a short time. The overall structure is quickly and conveniently assembled and installed, improving the efficiency of the experiment.

[0017] 3. The design of the transparent protective baffle and the noise-reducing exhaust window of the present utility model not only facilitates the observation of the experimental process, but also protects the experimental operators from the harm of splashes, and reduces noise and gas pollution, improving the safety of the experiment.

[0018] 4. The transparent protective baffle and the noise-reducing exhaust window with quick-release design of the present utility model simplify the installation, debugging and maintenance work of the equipment, reduce the maintenance cost, and at the same time, the design of the isolation baffle prevents the mutual interference between the equipment.

[0019] 5. The design of the debris box of the present utility model helps to collect and filter the debris and waste water generated during the experiment. The setting of the drain pipe and the ball valve facilitates the discharge of the waste water, reducing the environmental pollution.

[0020] 6. The frame design of the experimental box of the present utility model, combined with the four rectangular columns, the upper platform, the lower platform and the concrete block support platform, provides a firm support, ensuring the stability and reliability during the experiment.

[0021] 7. The design of the debris box of the present utility model helps to collect and filter the debris and waste water generated during the experiment. The setting of the drain pipe and the ball valve facilitates the discharge of the waste water, reducing the environmental pollution; the design of the support bars and the filter sheet in the debris box, as well as the configuration of the drain pipe and the water pump, enable the experiment to be carried out continuously without frequent interruption for waste cleaning.

[0022] 8. The device of the present utility model is not only applicable to the crushing experiment of concrete, but also its high-speed jet and extreme temperature simulation functions can be used for the performance testing of other materials, increasing the application scope of the equipment.

[0023] Of course, it is not necessary for any product implementing the present utility model to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic structural diagram of the experimental device for water and liquid nitrogen cyclic impact crushing of concrete of the present utility model.

[0026] Figure 2 It is Figure 1 A schematic structural diagram after removing the front transparent protective baffle and the right noise reduction exhaust window.

[0027] Figure 3 It is a schematic structural diagram of the experimental box.

[0028] Figure 4 It is a schematic structural diagram of the debris box.

[0029] Figure 5 It is a schematic structural diagram of the noise reduction exhaust window.

[0030] In the drawings, the list of components represented by each reference numeral is as follows:

[0031] 1 - experimental box, 2 - pressure tank, 3 - booster pump, 4 - air pump, 5 - debris box, 6 - insulation tank, 7 - transparent protective baffle, 8 - noise reduction exhaust window, 9 - bolt with handle, 10 - first pipeline connection, 11 - pressure switch, 12 - pressure gauge, 101 - rectangular column, 102 - upper platform, 103 - lower platform, 104 - concrete block support platform, 105 - drainage channel, 106 - threaded blind hole, 107 - external thread joint, 108 - liquid nitrogen conduit, 109 - intake conduit, 110 - water inlet pipe, 111 - solenoid valve pipeline valve, 112 - enclosure, 113 - conical funnel, 114 - isolation baffle, 115 - isolation baffle, 51 - rectangular box, 52 - lifting handle, 81 - rectangular plate body, 82 - air outlet hole, 83 - air guide plate, 84 - round through hole, 85 - sponge sheet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Specific Embodiment 1:

[0034] Please refer to Figures 1-5 As shown, the present utility model is an experimental device for water and liquid nitrogen cyclic impact crushing of concrete, including an experimental box 1, a pressure tank 2, a booster pump 3, an air pump 4, a debris box 5, a heat preservation tank 6, a transparent protective baffle 7, and a noise reduction exhaust window 8. Among them, the booster pump 3 extracts tap water from the municipal pipe network and pressurizes it into the pressure tank 2 to ensure sufficient water within a stable pressure range during the experiment. The heat preservation tank 6 is used to store liquid nitrogen, and the air pump 4 delivers gas to the heat preservation tank 6 to pressurize and discharge the liquid nitrogen in the heat preservation tank 6. The debris box 5 is used to carry the debris and water generated during the experiment. The transparent protective baffle 7 is used for observation during the experiment and at the same time to prevent splashes from escaping. The noise reduction exhaust window 8 timely discharges a large amount of gas generated in the experimental box 1 during the vaporization process of liquid nitrogen, and noise reduction is carried out through the discharged gas.

[0035] The experimental box 1 includes four rectangular columns 101 arranged in a rectangular shape. The upper and lower end faces of the four rectangular columns 101 are respectively fixed with an upper platform 102 and a lower platform 103. The middle parts of the four rectangular columns 101 are fixed with a concrete block support platform 104. The concrete block support platform 104 is provided with a row of drainage channels 105. The experimental box 1 is constructed in a frame manner, and the overall structure is stable and reliable, effectively ensuring the progress of the experiment. During the experiment, the concrete block test piece is placed on the concrete block support platform 104. The debris box 5 is placed on the lower platform 103.

[0036] Among them, in order to make the water flow smoothly downward and reduce the overflow amount, a retaining wall 112 is fixed at the edge part of the upper surface of the concrete block support platform 104. A conical funnel 113 is fixed on the lower surface of the concrete block support platform 104. The lower port of the conical funnel 113 is located at the center of the debris box 5.

[0037] One row of threaded blind holes 106 is opened on the two outer sides of the parts of the four rectangular columns 101 between the upper platform 102 and the concrete block support platform 104. A transparent protective baffle 7 is respectively installed on the front and rear sides of the experimental box 1 through a bolt 9 with a handle. A noise reduction exhaust window 8 is respectively installed on the left and right sides of the experimental box 1 through a bolt 9 with a handle. The transparent protective baffle 7 and the noise reduction exhaust window 8 are both installed on the experimental box 1 in a quick-release manner. This facilitates the installation and debugging of the internal equipment of the experimental box 1, and the split design also reduces the maintenance cost.

[0038] The lower surface of the upper platform 102 is fixedly provided with an external thread joint 107 that is threadedly connected and matched with the heat preservation tank 6. The upper platform 102 is fixedly penetrated with a liquid nitrogen conduit 108 with both ends facing downwards. One end of the liquid nitrogen conduit 108 passes through the external thread joint 107 and is placed at the inner bottom of the heat preservation tank 6, and the other end of the liquid nitrogen conduit 108 is placed above the middle of the concrete block support platform 104. The upper platform 102 is fixedly penetrated with an air inlet conduit 109 placed inside the external thread joint 107. The other end of the air inlet conduit 109 is connected to the air outlet end of the air pump 4. The above structure constitutes a liquid nitrogen injection system. In order to ensure the safety of the entire liquid nitrogen injection system, a stop valve and a pressure relief valve can also be installed on the liquid nitrogen conduit 108. The air pump 4 inflates the heat preservation tank 6, presses the liquid nitrogen in the heat preservation tank 6 downwards, quickly presses it out from the lower liquid nitrogen conduit 108, and sprays it onto the concrete block test piece below to quickly cool it down.

[0039] The middle of the upper platform 102 is fixedly penetrated with a water inlet pipe 110. The water inlet pipe 110 is connected to the pressure tank 2. An electromagnetic valve pipeline valve 111 is installed on the water inlet pipe 110. The booster pump 3 and the pressure tank 2 are connected through a first pipeline connection 10. A pressure switch 11 is installed on the pressure tank 2. A pressure gauge 12 is installed at the upper end of the pressure tank 2 to facilitate observing the real-time pressure state of the pressure tank 2. The end of the water inlet pipe 110 is provided with a vertically downward spray head 114. The above structure constitutes a high-pressure water injection system. The entire high-pressure water injection system can provide stable high-pressure water to impact the concrete block test piece below. The high-pressure water injection system and the liquid nitrogen injection system alternately impact and crush the concrete block test piece below to test the crushing effect of the combination of the two and facilitate observing the macroscopic crushing result.

[0040] Among them, the noise reduction exhaust window 8 includes a rectangular plate body 81. The rectangular plate body 81 is provided with a row of vertically arranged air outlet holes 82. A wind guide plate 83 arranged obliquely upwards is fixed on the outer side surface of the rectangular plate body 81 at the lower end of the air outlet holes 82. The rectangular plate body 81 is provided with two rows of round through holes 84 that cooperate with the bolt with a handle 9. A sponge sheet 85 is fixed on the inner side surface of the rectangular plate body 81. The noise reduction exhaust window 8 takes into account both exhaust and noise reduction and dust removal, effectively reducing the environmental pollution of the laboratory.

[0041] In order to avoid the influence of the extremely low temperature at the end of the liquid nitrogen conduit 108 on the water inlet pipe 110 and the spray head 114, two parallel isolation baffles 115 are fixed on the lower surface of the upper platform 102 between the water inlet pipe 110 and the liquid nitrogen conduit 108.

[0042] Among them, the sundry box 5 includes a rectangular box 51 with an upper opening. A lifting handle 52 is respectively installed on a pair of opposite outer side surfaces of the rectangular box 51, and the overall structure facilitates the transfer of experimental garbage.

[0043] In order for the glove box 5 to drain water in time and extend the overall continuous experiment time, a row of support bars is fixed to the inner opposite walls of the rectangular box 51. A filter sheet is installed on the row of support bars. A drain pipe is fixedly penetrated through the outer wall of the lower end of the rectangular box 51, and a ball valve is installed on the drain pipe. A water pump is installed on the drain pipe, and the waste water is discharged into the waste water tank through a water pipe.

[0044] In the description of this specification, the descriptions with reference to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0045] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the relevant technical fields can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An experimental device for crushing concrete by circulating impact of water and liquid nitrogen, characterized in that: It includes an experimental box (1), a pressure tank (2), a booster pump (3), an air pump (4), a debris box (5), a heat preservation tank (6), a transparent protective baffle (7), and a noise reduction exhaust window (8); The experimental box (1) includes four rectangular columns (101) arranged in a rectangle; the upper and lower end faces of the four rectangular columns (101) are respectively fixed with an upper platform (102) and a lower platform (103); the middle parts of the four rectangular columns (101) are fixed with a concrete block support platform (104); a row of drainage channels (105) are opened on the concrete block support platform (104); On the two outer sides of the parts of the four rectangular columns (101) between the upper platform (102) and the concrete block support platform (104), a column of threaded blind holes (106) are opened; A transparent protective baffle (7) is respectively installed on the front and rear sides of the experimental box (1) through a bolt with a handle (9); a noise reduction exhaust window (8) is respectively installed on the left and right sides of the experimental box (1) through a bolt with a handle (9); The lower surface of the upper platform (102) is fixed with an external thread joint (107) that is threadedly connected and matched with the heat preservation tank (6); a liquid nitrogen conduit (108) with both ends facing down is fixedly penetrated through the upper platform (102), and one end of the liquid nitrogen conduit (108) passes through the external thread joint (107) and is placed at the inner bottom of the heat preservation tank (6), and the other end of the liquid nitrogen conduit (108) is placed above the middle of the concrete block support platform (104); an air inlet conduit (109) placed inside the external thread joint (107) is fixedly penetrated through the upper platform (102); the other end of the air inlet conduit (109) is connected to the air outlet end of the air pump (4); A water inlet pipe (110) is fixedly penetrated through the middle of the upper platform (102); the water inlet pipe (110) is connected to the pressure tank (2); a solenoid valve pipeline valve (111) is installed on the water inlet pipe (110); the booster pump (3) and the pressure tank (2) are connected through a first pipeline connection (10); a pressure switch (11) is installed on the pressure tank (2); A vertically downward spray head (114) is installed at the end of the water inlet pipe (110).

2. The experimental device for water and liquid nitrogen cyclic impact crushing of concrete according to claim 1, characterized in that, A retaining wall (112) is fixed on the edge of the upper surface of the concrete block support platform (104); a conical funnel (113) is fixed on the lower surface of the concrete block support platform (104).

3. The experimental device for water and liquid nitrogen cyclic impact crushing of concrete according to claim 1, characterized in that, The noise reduction exhaust window (8) includes a rectangular plate body (81); a column of vertical air outlet holes (82) are opened on the rectangular plate body (81); a wind guiding plate (83) arranged obliquely upward is fixed on the outer side of the rectangular plate body (81) at the lower end of the air outlet hole (82); two columns of circular through holes (84) matched with the bolt with a handle (9) are opened on the rectangular plate body (81); a sponge sheet (85) is fixed on the inner side of the rectangular plate body (81).

4. The experimental device for water and liquid nitrogen cyclic impact crushing of concrete according to claim 1, characterized in that, A pressure gauge (12) is installed at the upper end of the pressure tank (2).

5. The experimental device for water and liquid nitrogen cyclic impact crushing of concrete according to claim 1, characterized in that, Two parallel isolation baffles (115) are fixedly arranged between the water inlet pipe (110) and the liquid nitrogen conduit (108) on the lower surface of the upper platform (102).

6. The experimental device for water and liquid nitrogen cyclic impact crushing of concrete according to claim 1, characterized in that The sundry box (5) includes a rectangular box (51) with an upper opening; a lifting handle (52) is respectively installed on one pair of opposite outer sides of the rectangular box (51).

7. The experimental device for water and liquid nitrogen cyclic impact crushing of concrete according to claim 6, characterized in that, A row of support strips are fixedly arranged on a pair of opposite inner walls inside the rectangular box (51); a filter sheet is installed on the row of support strips; a drain pipe penetrates and is fixedly arranged on the outer wall of the lower end of the rectangular box (51), and a ball valve is installed on the drain pipe.

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