A kind of auxiliary detection equipment for gas permeability of unsaturated concrete

Abstract

The invention relates to the technical field of concrete detection, and discloses an auxiliary detection device for gas permeability of unsaturated concrete, comprising an operating table, a suction filter pump fixedly installed on the top of the operating table, a suction filter mechanism, a test component, a gas flow detector and a high-pressure air pump, and a concrete test piece arranged inside the suction filter mechanism and the test component. The suction filter mechanism comprises a support frame and a support table fixedly installed on the operating table, and a bearing component fixedly installed on the inner wall of the support frame. By setting a filter bottle component, water filtered in a Buchner funnel is dripped into a hemispherical filter bottle through a drip pipe, and then evenly distributed in five water accumulation chambers through a hemispherical diversion block, each water accumulation chamber stores 20% of water, and at this time, the upper through holes in the water accumulation chamber are all misaligned with the middle through holes, and the middle through holes are respectively corresponding to the upper through holes and the lower through holes by adjusting the components, so that the water in the water accumulation chamber flows into the water delivery component, so as to achieve the effect of controlling the water delivery amount.

Description

Technical Field

[0001] The invention relates to the technical field of concrete detection, and in particular to an auxiliary detection device for gas permeability of unsaturated concrete. Background Art

[0002] Unsaturated concrete gas permeability auxiliary detection equipment is a tool used to evaluate the gas permeability in concrete structures. This equipment usually detects the pore structure and permeability in concrete by applying a certain pressure of gas (such as nitrogen or helium). By monitoring the permeation rate and pressure changes of gas in concrete, the quality and durability of concrete, as well as any potential leakage problems, can be evaluated.

[0003] Existing studies have used gas permeation tests, empirical models based on pore structure characteristics and other research methods to conduct in-depth research on the gas permeation characteristics and sealing performance of unsaturated concrete, and characterized the concrete pore structure in dry and wet states through indirect / direct testing methods. However, existing studies on the pore structure of unsaturated concrete in the macro-micro-multiscale wet state are relatively rare, and there is also a lack of research on the gas-liquid two-phase permeation simulation of each component, and there is even less in-depth exploration of the multi-scale two-phase permeation simulation of unsaturated concrete. This can neither reveal the multi-scale pore structure characteristics of concrete water sensitivity, nor deeply understand the storage form and state of water in each component and each scale pore structure. It is even more difficult to study the permeation mechanism issues such as its role, mutual correlation and influence in the gas permeation process of unsaturated concrete, and the evolution law of its internal pore structure and gas permeability mechanism cannot be carried out. Therefore, it is necessary to test the gas permeability of concrete at different saturations to solve the above problems. Summary of the invention

[0004] In view of the fact that the existing technology lacks research on the pore structure of unsaturated concrete under macroscopic, mesoscopic and microscopic multi-scale wetting states, an auxiliary detection device for gas permeability of unsaturated concrete is proposed.

[0005] In one aspect of the present application, an auxiliary detection device for gas permeability of unsaturated concrete is provided, the purpose of which is to extract the water in 100% saturated concrete by filtration method, and then divide it into five parts to reabsorb and measure the water permeability of concrete at different saturations, so as to achieve the effect of solving the pore structure of unsaturated concrete in the macroscopic, microscopic and microscopic multi-scale wetting state.

[0006] The technical scheme of the present invention is: an auxiliary detection device for gas permeability of unsaturated concrete, comprising an operating table, a suction filter pump fixedly installed on the top of the operating table, a suction filter mechanism, a test assembly, a gas flow detector and a high-pressure air pump, and a concrete test piece arranged inside the suction filter mechanism and the test assembly, the suction filter mechanism comprising a support frame and a support table fixedly installed on the operating table, a bearing assembly fixedly installed on the inner wall of the support frame, a filter bottle assembly fixedly installed on the top of the support table, an adjustment assembly rotatably connected to the inner wall of the support table, and a water delivery assembly fixedly installed on the top of the operating table; the filter bottle assembly comprises a hemispherical filter bottle, a sealing ring fixedly installed on the top of the hemispherical filter bottle, a circular indicator and a plurality of light-transmitting ports opened on the outer wall of the hemispherical filter bottle, a hemispherical diverter block fixedly connected to the inner wall of the hemispherical filter bottle, five water accumulation cavities opened on the inner wall of the hemispherical filter bottle, and an upper end through hole opened at the bottom of the water accumulation cavity, and the bottom of the hemispherical filter bottle is fixedly connected to the top of the support table.

[0007] By adopting the above scheme, the water generated by filtration drips into the hemispherical filter bottle and is evenly distributed in the five water accumulation chambers through the hemispherical diverter block. Each water accumulation chamber stores 20% of the water, and at this time, the upper through holes in the water accumulation chamber are misaligned with the middle through holes. By adjusting the components, the middle through holes correspond to the upper through holes and the lower through holes respectively, so that the water in the water accumulation chamber flows into the water delivery component, thereby achieving the effect of controlling the water delivery volume.

[0008] Furthermore, the supporting assembly includes a Buchner funnel, a dripping pipe fixedly connected to the bottom of the Buchner funnel, and filter paper arranged on the inner wall of the Buchner funnel. The outer wall of the Buchner funnel is fixedly connected to the inner wall of the support frame, the outer wall of the dripping pipe is clamped with the inner wall of the sealing ring, and the dripping pipe is arranged directly above the hemispherical diversion block, and the top of the filter paper overlaps the bottom of the concrete specimen.

[0009] The above scheme is adopted, by placing a concrete specimen with a saturation of 100% after immersion on filter paper in a Büchner funnel, running a suction pump, and using a suction tube to perform suction filtration. The water generated by the filtration is collected by the Büchner funnel and drips from a drip tube into a hemispherical filter bottle until the saturation of the concrete specimen is 0, thereby achieving the effect of filtering out the water in the concrete specimen.

[0010] Furthermore, the adjustment component includes an adjustment platform, a central through hole opened on the inner wall of the adjustment platform, an adjustment bevel gear fixedly connected to the outer wall of the adjustment platform, and an indicator light fixedly installed on the top of the adjustment bevel gear. The outer wall of the adjustment platform is rotatably connected to the inner wall of the support platform, the top of the adjustment platform is rotatably connected to the bottom of the hemispherical filter bottle, and the indicator light has the same orientation as the central through hole.

[0011] Furthermore, the adjustment component also includes a knob and a transmission bevel gear sleeved on the knob output shaft, the teeth of the transmission bevel gear mesh with the teeth of the adjustment bevel gear, and the knob is rotatably connected to the outer wall of the support platform.

[0012] By adopting the above scheme, by twisting the knob, the knob rotates and drives the adjustment platform to rotate through the transmission bevel gear and the adjustment bevel gear, so that the middle through hole corresponds to one of the upper through holes and one of the lower through holes, so that the moisture in the corresponding water accumulation cavity can be transported to the test assembly through the water delivery assembly for detection, and the indicator light rotates with the middle through hole to illuminate the circular indicator gauge in multiple light-transmitting ports in turn, thereby achieving the effect of reflecting the water delivery position and water delivery percentage.

[0013] Furthermore, the water delivery assembly includes a diversion funnel, a plurality of lower end through holes opened on the inner wall of the diversion funnel, and a water delivery pipe fixedly connected to the bottom of the diversion funnel, the bottom of the diversion funnel is fixedly connected to the top of the support frame, and the top of the diversion funnel is rotatably connected to the bottom of the adjustment platform.

[0014] By adopting the above scheme, the upper through hole, the middle through hole and the lower through hole are connected by rotating the adjustment component, so that the moisture in the corresponding water accumulation cavity can be transported from the diversion funnel through the water pipe to the test component for testing, thereby achieving the effect of transporting moisture.

[0015] Furthermore, the test assembly includes a test sealing shell, an inflatable rubber bag fixedly mounted on the inner wall of the test sealing shell, and an upper pad and a lower pad overlapped on the inner wall of the inflatable rubber bag. The bottom of the test sealing shell is fixedly connected to the top of the operating table, and the bottom of the upper pad and the top of the lower pad are overlapped with the top and bottom of the concrete specimen respectively.

[0016] Furthermore, an immersion cavity is formed between the inner wall of the inflatable rubber bag and the outer wall of the concrete specimen, the inner wall of the immersion cavity is fixedly connected to one end of the water pipe through a penetration test sealing shell, the inner wall of the upper end pad is provided with an infiltration air outlet cavity, and the inner wall of the lower end pad is provided with an infiltration air inlet cavity.

[0017] The above scheme is adopted, and water is transported to the immersion chamber by setting a water pipe. The concrete specimen with zero saturation absorbs the water in the immersion chamber between the upper pad and the lower pad, and is left to stand for a period of time to allow it to be fully absorbed. Then, the inflatable rubber bag is inflated to make it bulge and squeeze the immersion chamber. The space of the immersion chamber is reduced and the surrounding of the concrete specimen is fully sealed. Then, gas is injected into the infiltration cavity, and the gas penetrates from the unsaturated concrete specimen into the infiltration cavity.

[0018] Furthermore, a gas detection delivery pipe is fixedly connected to the outer wall of the gas flow detector, and one end of the gas detection delivery pipe is fixedly connected to the inner wall of the permeation cavity through a penetration test sealing shell.

[0019] By adopting the above scheme, a gas detection delivery pipe is provided to connect the gas flow detector and the permeation cavity, so that the gas permeability of concrete specimens at different saturations can be tested.

[0020] Furthermore, an inflation main pipe and an inflation branch pipe are fixedly connected to the outer wall of the high-pressure air pump, one end of the inflation main pipe is fixedly connected to the inner wall of the inflatable rubber bag via a penetration test sealing shell, and one end of the inflation branch pipe is fixedly connected to the inner wall of the infiltration air cavity via a penetration test sealing shell.

[0021] By adopting the above scheme, by setting up an inflation main pipe and an inflation branch pipe, the high-pressure air pump can be connected to the inflation rubber bag and the infiltration air inlet cavity respectively, so as to provide gas for the inflation rubber bag and the infiltration air inlet cavity.

[0022] Furthermore, a suction pipe is fixedly connected to the outer wall of the suction pump, and one end of the suction pipe is fixedly connected to the inner wall of the hemispherical filter bottle.

[0023] By adopting the above scheme, a suction filtration pipe is provided to connect the suction filtration pump and the hemispherical filter bottle to provide power for the suction filtration.

[0024] Beneficial effects of the present invention:

[0025] 1. By setting up a filter bottle assembly, the water filtered in the Büchner funnel drips into the hemispherical filter bottle through a dripping pipe, and then is evenly distributed in five water accumulation chambers through a hemispherical diverter block. Each water accumulation chamber stores 20% of the water, and at this time, the upper through holes in the water accumulation chamber are misaligned with the middle through holes. By adjusting the assembly, the middle through holes correspond to the upper through holes and the lower through holes respectively, so that the water in the water accumulation chamber flows into the water delivery assembly, thereby achieving the effect of controlling the water delivery volume.

[0026] 2. By twisting the knob, the knob rotates and drives the adjustment table to rotate through the transmission bevel gear and the adjustment bevel gear, so that the middle through hole corresponds to one of the upper through holes and one of the lower through holes, so that the water in the corresponding water accumulation cavity can be transported to the test assembly through the water delivery assembly for detection, and the indicator light rotates with the middle through hole to illuminate the circular indicator table in multiple light-transmitting ports in turn, so as to achieve the effect of reflecting the water delivery position and water delivery percentage.

[0027] 3. Water is transported to the immersion chamber by setting a water pipe. The concrete specimen with 0 saturation absorbs the water in the immersion chamber between the upper pad and the lower pad. It is left to stand for a period of time to fully absorb the water. Then the inflatable rubber bag is inflated to swell and squeeze the immersion chamber. The space of the immersion chamber is reduced and the surrounding of the concrete specimen is fully sealed. Then gas is injected into the infiltration cavity. The gas penetrates from the unsaturated concrete specimen to the infiltration cavity, so as to achieve the effect of gas permeability detection of concrete specimens at different saturations. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the main structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the main structure of the present invention from a top view;

[0031] Figure 4 It is a structural schematic diagram of the filtration mechanism of the present invention;

[0032] Figure 5 It is a schematic diagram of the explosion of the filtration mechanism of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the bearing assembly of the present invention;

[0034] Figure 7 It is a structural schematic diagram of the filter bottle assembly of the present invention;

[0035] Figure 8 It is a structural schematic diagram of the regulating component of the present invention;

[0036] Fig. 9 It is a structural schematic diagram of the water delivery component of the present invention;

[0037] Fig.10 It is a schematic diagram of explosion of the test assembly of the present invention;

[0038] Fig.11 It is a schematic diagram of the inflatable rubber bag of the present invention when it is not inflated;

[0039] Fig.12 It is a schematic diagram of the inflatable rubber bag of the present invention when it is inflated;

[0040] Fig.13 It is a structural schematic diagram of the gas flow detector of the present invention;

[0041] Fig.14 It is a structural schematic diagram of the high-pressure air pump of the present invention.

[0042] In the figure:

[0043] 1. Operation table; 2. Filter pump; 21. Filter tube; 3. Filter mechanism; 31. Support frame; 32. Carrying assembly; 321. Filter paper; 322. Buchner funnel; 323. Drip pipe; 33. Filter bottle assembly; 331. Sealing ring; 332. Hemispherical filter bottle; 333. Circular indicator; 334. Light-transmitting port; 335. Hemispherical diverter block; 336. Water accumulation chamber; 337. Upper through hole; 34. Adjustment assembly; 341. Knob; 342. Transmission bevel gear; 343. Adjustment bevel gear; 344. Indicator Lamp; 345, middle through hole; 346, adjustment table; 35, support table; 36, water delivery component; 361, diversion funnel; 362, lower through hole; 363, water delivery pipe; 4, test component; 41, upper end pad; 42, test sealing shell; 43, inflatable rubber bag; 44, lower end pad; 45, infiltration air cavity; 46, infiltration air cavity; 47, immersion cavity; 5, gas flow detector; 51, gas detection delivery pipe; 6, high-pressure air pump; 61, inflation main pipe; 62, inflation branch pipe; 7, concrete specimen. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0045] Example 1, reference Figure 1 - Fig. 9 , which is the first embodiment of the present invention, provides an auxiliary detection device for gas permeability of unsaturated concrete, including an operating table 1, a filtration pump 2 fixedly installed on the top of the operating table 1, a filtration mechanism 3, a test assembly 4, a gas flow detector 5 and a high-pressure air pump 6, and a concrete specimen 7 arranged inside the filtration mechanism 3 and the test assembly 4. The filtration mechanism 3 includes a support frame 31 and a support platform 35 fixedly installed on the operating table 1, a bearing assembly 32 fixedly installed on the inner wall of the support frame 31, a filter bottle assembly 33 fixedly installed on the top of the support platform 35, an adjustment assembly 34 rotatably connected to the inner wall of the support platform 35, and a water delivery assembly 36 fixedly installed on the top of the operating table 1.

[0046] Reference Figure 5 - Figure 7 The filter bottle assembly 33 includes a hemispherical filter bottle 332, a sealing ring 331 fixedly mounted on the top of the hemispherical filter bottle 332, a circular indicator 333 and a plurality of light-transmitting ports 334 opened on the outer wall of the hemispherical filter bottle 332, a hemispherical diverter block 335 fixedly connected to the inner wall of the hemispherical filter bottle 332, five water accumulation chambers 336 opened on the inner wall of the hemispherical filter bottle 332, and an upper end through hole 337 opened at the bottom of the water accumulation chamber 336, and the bottom of the hemispherical filter bottle 332 is fixedly connected to the top of the support platform 35.

[0047] Specifically, the hemispherical filter bottle 332 is arranged between the supporting component 32 and the adjusting component 34, the hemispherical filter bottle 332 and the supporting component 32 are fixedly connected by a sealing ring 331, the hemispherical filter bottle 332 is rotatably connected to the adjusting component 34, the inner wall of the hemispherical filter bottle 332 is fixedly connected with a hemispherical diverter block 335, and five water accumulation chambers 336 are evenly opened at the bottom of the hemispherical diverter block 335, an upper end through hole 337 is opened in the water accumulation chamber 336, and a circular indicator 333 and multiple light-transmitting openings 334 are opened on the outer wall of the hemispherical filter bottle 332.

[0048] The water produced by filtration drips into the hemispherical filter bottle 332 and is evenly distributed in the five water storage chambers 336 through the hemispherical diverter block 335. Each water storage chamber 336 stores 20% of the water. At this time, the upper through hole 337 in the water storage chamber 336 is misaligned with the middle through hole 345. The middle through hole 345 is made to correspond to the upper through hole 337 and the lower through hole 362 respectively by adjusting the component 34, so that the water in the water storage chamber 336 flows into the water delivery component 36, thereby achieving the effect of controlling the water delivery amount.

[0049] Reference Figure 5 - Figure 6 The supporting assembly 32 includes a Buchner funnel 322, a dripping pipe 323 fixedly connected to the bottom of the Buchner funnel 322, and a filter paper 321 arranged on the inner wall of the Buchner funnel 322. The outer wall of the Buchner funnel 322 is fixedly connected to the inner wall of the support frame 31, the outer wall of the dripping pipe 323 is clamped with the inner wall of the sealing ring 331, and the dripping pipe 323 is arranged directly above the hemispherical diversion block 335, and the top of the filter paper 321 overlaps the bottom of the concrete specimen 7.

[0050] Specifically, the inner wall of the Buchner funnel 322 is provided with filter paper 321 , and the 100% saturated concrete specimen 7 is placed on the filter paper 321 . A dripping pipe 323 is provided at the bottom of the Buchner funnel 322 , and the dripping pipe 323 is clamped with the sealing ring 331 .

[0051] The concrete specimen 7 with a saturation of 100% after immersion is placed on the filter paper 321 in the Büchner funnel 322, the filtration pump 2 is operated, and the filtration operation is performed using the filtration tube 21. The water generated by the filtration is collected by the Büchner funnel 322 and dripped into the hemispherical filter bottle 332 through the drip tube 323 until the saturation of the concrete specimen 7 is 0. The filtration is completed, thereby achieving the effect of filtering out the water in the concrete specimen 7.

[0052] Reference Figure 7 - Figure 8The adjustment component 34 includes an adjustment platform 346, a middle through hole 345 opened on the inner wall of the adjustment platform 346, an adjustment bevel gear 343 fixedly connected to the outer wall of the adjustment platform 346, and an indicator light 344 fixedly installed on the top of the adjustment bevel gear 343. The outer wall of the adjustment platform 346 is rotatably connected to the inner wall of the support platform 35, the top of the adjustment platform 346 is rotatably connected to the bottom of the hemispherical filter bottle 332, the indicator light 344 has the same orientation as the middle through hole 345, the adjustment component 34 also includes a knob 341, and a transmission bevel gear 342 sleeved on the output shaft of the knob 341, the teeth of the transmission bevel gear 342 are meshed with the teeth of the adjustment bevel gear 343, and the knob 341 is rotatably connected to the outer wall of the support platform 35.

[0053] Specifically, the top of the adjustment platform 346 is rotatably connected to the bottom of the hemispherical filter bottle 332, and the outer wall of the adjustment platform 346 is fixedly connected to the adjustment bevel gear 343, the teeth of the adjustment bevel gear 343 are meshed with the teeth of the transmission bevel gear 342, and the rotation of the transmission bevel gear 342 is controlled by the knob 341, and an indicator light 344 is provided on the top of the adjustment bevel gear 343. The indicator light 344 illuminates in multiple light-transmitting ports 334 to indicate the circular indicator gauge 333, and the inner wall of the adjustment platform 346 is provided with a middle through hole 345, and the middle through hole 345 corresponds to the position of the indicator light 344.

[0054] By twisting the knob 341, the knob 341 rotates and drives the adjustment platform 346 to rotate through the transmission bevel gear 342 and the adjustment bevel gear 343, so that the middle through hole 345 corresponds to one of the upper through holes 337 and one of the lower through holes 362, so that the water in the corresponding water accumulation chamber 336 can be transported to the test component 4 for detection through the water delivery component 36, and the indicator light 344 can rotate with the middle through hole 345 to illuminate the circular indicator meter 333 in the multiple light-transmitting ports 334 in turn, so as to achieve the effect of reflecting the water delivery position and water delivery percentage.

[0055] Reference Figure 8 - Fig. 9 The water delivery assembly 36 includes a diversion funnel 361, a plurality of lower end through holes 362 opened on the inner wall of the diversion funnel 361, and a water delivery pipe 363 fixedly connected to the bottom of the diversion funnel 361. The bottom of the diversion funnel 361 is fixedly connected to the top of the support frame 31, and the top of the diversion funnel 361 is rotatably connected to the bottom of the adjustment platform 346.

[0056] Specifically, the top of the diversion funnel 361 is rotatably connected to the bottom of the adjustment platform 346, the inner wall of the diversion funnel 361 is provided with a plurality of lower end through holes 362, and the plurality of lower end through holes 362 respectively correspond to the plurality of upper end through holes 337 one by one, and the bottom of the diversion funnel 361 is fixedly connected with a water pipe 363, and the water pipe 363 is connected to the test component 4.

[0057] By rotating the adjustment component 34, the upper through hole 337, the middle through hole 345 and the lower through hole 362 are connected, so that the water in the corresponding water accumulation chamber 336 can be transported from the diversion funnel 361 to the test component 4 through the water pipe 363 for detection, thereby achieving the effect of transporting water.

[0058] During use, the concrete specimen 7 with a saturation of 100% after soaking is placed on the filter paper 321 in the Büchner funnel 322, the filtration pump 2 is operated, and the filtration tube 21 is used for filtration. The water generated by the filtration is collected by the Büchner funnel 322 and dripped into the hemispherical filter bottle 332 through the dripping pipe 323. After the filtration is completed, the concrete specimen 7 with a saturation of 0 is placed inside the test assembly 4, and the water dripping into the hemispherical filter bottle 332 is evenly distributed in the five water accumulation chambers 336 through the hemispherical diverter block 335. Each water accumulation chamber 336 stores 20% of the water, and at this time, the upper end of the water accumulation chamber 336 The through holes 337 are all misaligned with the middle through hole 345; when testing, twist the knob 341, and the knob 341 rotates to drive the adjustment platform 346 to rotate through the transmission bevel gear 342 and the adjustment bevel gear 343, so that the middle through hole 345 corresponds to one of the upper through holes 337 and one of the lower through holes 362, so that the water in the corresponding water accumulation cavity 336 can be transported from the diversion funnel 361 to the test component 4 through the water pipe 363 for testing, and the indicator light 344 can rotate with the middle through hole 345 to illuminate the circular indicator 333 in multiple light-transmitting ports 334 in turn, so as to achieve the effect of reflecting the water delivery position and water delivery percentage.

[0059] Example 2, reference Figure 4 - Fig.14 , which is the second embodiment of the present invention, and which is different from the first embodiment in that: Fig.10 - Fig.12 The test assembly 4 includes a test sealing shell 42, an inflatable rubber bag 43 fixedly installed on the inner wall of the test sealing shell 42, and an upper pad 41 and a lower pad 44 overlapped on the inner wall of the inflatable rubber bag 43. The bottom of the test sealing shell 42 is fixedly connected to the top of the operating table 1, the bottom of the upper pad 41 and the top of the lower pad 44 are overlapped with the top and bottom of the concrete specimen 7 respectively, and an immersion chamber 47 is formed between the inner wall of the inflatable rubber bag 43 and the outer wall of the concrete specimen 7. The inner wall of the immersion chamber 47 is fixedly connected to one end of the water pipe 363 by penetrating the test sealing shell 42. The inner wall of the upper pad 41 is provided with an infiltration air outlet cavity 45, and the inner wall of the lower pad 44 is provided with an infiltration air inlet cavity 46.

[0060] Specifically, the test sealing shell 42 is fixedly installed on the operating table 1, and the inner wall of the test sealing shell 42 is fixedly connected with the upper pad 41 and the lower pad 44, and the concrete specimen 7 is placed between the upper pad 41 and the lower pad 44. The inner wall of the test sealing shell 42 is also fixedly connected with the inflatable rubber bag 43, and an immersion chamber 47 is provided between the inflatable rubber bag 43 and the concrete specimen 7, and the inner wall of the immersion chamber 47 is connected to one end of the water pipe 363.

[0061] Water is transported to the immersion chamber 47 by setting a water pipe 363, and the concrete specimen 7 with zero saturation absorbs the water in the immersion chamber 47 between the upper pad 41 and the lower pad 44, and is left to stand for a period of time to allow it to be fully absorbed. Then, the inflatable rubber bag 43 is inflated to make it bulge and squeeze the immersion chamber 47. The space of the immersion chamber 47 is reduced and the surrounding of the concrete specimen 7 is fully sealed. Then, gas is injected into the infiltration air inlet cavity 46, and the gas penetrates from the unsaturated concrete specimen 7 to the infiltration air outlet cavity 45.

[0062] Reference Fig.13 A gas detection delivery pipe 51 is fixedly connected to the outer wall of the gas flow detector 5 , and one end of the gas detection delivery pipe 51 is fixedly connected to the inner wall of the permeation cavity 45 through a penetration test sealing shell 42 .

[0063] By arranging a gas detection delivery pipe 51 to connect the gas flow detector 5 with the permeation cavity 45, gas permeability detection can be performed on the concrete specimens 7 at different saturations.

[0064] Reference Fig.14 The outer wall of the high-pressure air pump 6 is fixedly connected with an inflation main pipe 61 and an inflation branch pipe 62. One end of the inflation main pipe 61 is fixedly connected to the inner wall of the inflation rubber bag 43 through a penetration test sealing shell 42. One end of the inflation branch pipe 62 is fixedly connected to the inner wall of the penetration air inlet cavity 46 through a penetration test sealing shell 42.

[0065] By providing the inflation main pipe 61 and the inflation branch pipe 62 , the high pressure air pump 6 can be connected with the inflation rubber bag 43 and the infiltration air inlet cavity 46 respectively, so as to provide gas for the inflation rubber bag 43 and the infiltration air inlet cavity 46 .

[0066] Reference Figure 4 The outer wall of the suction pump 2 is fixedly connected with a suction tube 21 , and one end of the suction tube 21 is fixedly connected to the inner wall of the hemispherical filter bottle 332 .

[0067] The suction filtration tube 21 is provided to connect the suction filtration pump 2 and the hemispherical filter bottle 332 to provide power for the suction filtration.

[0068] During use, the suction pump 2 is operated, and the suction pipe 21 is used for suction operation. The water obtained by suction is transported to the immersion chamber 47 through the water delivery pipe 363. The concrete specimen 7 with zero saturation absorbs the water in the immersion chamber 47 between the upper pad 41 and the lower pad 44, and is left to stand for a period of time to fully absorb it. Then, the high-pressure air pump 6 is operated to inflate the inflatable rubber bag 43 through the inflation main pipe 61, so that the inflatable rubber bag 43 bulges and squeezes the immersion chamber 47. The space of the immersion chamber 47 is reduced and the surrounding of the concrete specimen 7 is fully sealed. Then, gas is injected into the infiltration inlet chamber 46 through the inflation branch pipe 62. The gas penetrates from the unsaturated concrete specimen 7 and is then transported to the gas flow detector 5 through the infiltration outlet chamber 45 by the gas detection delivery pipe 51 to detect its gas permeability. The rest of the structure is the same as that of Example 1.

[0069] Working principle of the present invention:

[0070] During operation, the concrete specimen 7 with a saturation of 100% after soaking is placed on the filter paper 321 in the Büchner funnel 322, the filtration pump 2 is operated, and the filtration operation is performed using the filtration tube 21. The water generated by the filtration is collected by the Büchner funnel 322 and dripped into the hemispherical filter bottle 332 through the dripping pipe 323 until the saturation of the concrete specimen 7 is 0 and the filtration is completed;

[0071] After the filtration is completed, the concrete specimen 7 with zero saturation is placed inside the test assembly 4, and the water dripping into the hemispherical filter bottle 332 is evenly distributed in the five water accumulation chambers 336 through the hemispherical diverter block 335. Each water accumulation chamber 336 stores 20% of the water, and at this time, the upper through hole 337 in the water accumulation chamber 336 is misaligned with the middle through hole 345, waiting for detection;

[0072] During testing, the knob 341 is twisted, and the knob 341 rotates through the transmission bevel gear 342 and the adjustment bevel gear 343 to drive the adjustment platform 346 to rotate, so that the middle through hole 345 corresponds to one of the upper through holes 337 and one of the lower through holes 362, so that the water in the corresponding water accumulation chamber 336 can be transported from the diversion funnel 361 to the test assembly 4 through the water pipe 363 for testing, and the indicator light 344 rotates with the middle through hole 345 to illuminate the circular indicator 333 in the multiple light-transmitting ports 334 in turn, so as to achieve the effect of reflecting the water delivery position and water delivery percentage;

[0073] The water delivery pipe 363 delivers water to the immersion chamber 47. The concrete specimen 7 with zero saturation absorbs the water in the immersion chamber 47 between the upper pad 41 and the lower pad 44. It is left to stand for a period of time to fully absorb the water. Then, the high-pressure air pump 6 is operated to inflate the inflatable rubber bag 43 through the inflation main pipe 61, so that the inflatable rubber bag 43 swells and squeezes the immersion chamber 47. The space of the immersion chamber 47 is reduced and the surrounding of the concrete specimen 7 is fully sealed. Then, gas is injected into the infiltration inlet chamber 46 through the inflation branch pipe 62. The gas penetrates from the unsaturated concrete specimen 7 and is then transported to the gas flow detector 5 through the infiltration outlet chamber 45 by the gas detection delivery pipe 51 to detect its gas permeability.

[0074] The water flow rate is controlled by adjusting the knob 341 to enter the immersion chamber 47 in sequence, and then the gas flow detector 5 detects the gas permeability of 0% saturation, 20% saturation, 40% saturation, 60% saturation, and 80% saturation in sequence, thereby achieving the effect of detecting the gas permeability of the concrete specimen 7 at different saturations.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An auxiliary detection device for gas permeability of unsaturated concrete, comprising an operating table (1), a filtration pump (2) fixedly mounted on the top of the operating table (1), a filtration mechanism (3), a test assembly (4), a gas flow detector (5) and a high-pressure air pump (6), and a concrete test piece (7) arranged inside the filtration mechanism (3) and the test assembly (4), characterized in that: The filtration mechanism (3) comprises a support frame (31) and a support platform (35) fixedly mounted on the operating table (1), a bearing assembly (32) fixedly mounted on the inner wall of the support frame (31), a filter bottle assembly (33) fixedly mounted on the top of the support platform (35), an adjustment assembly (34) rotatably connected to the inner wall of the support platform (35), and a water delivery assembly (36) fixedly mounted on the top of the operating table (1); The filter bottle assembly (33) comprises a hemispherical filter bottle (332), a sealing ring (331) fixedly mounted on the top of the hemispherical filter bottle (332), a circular indicator (333) and a plurality of light-transmitting openings (334) opened on the outer wall of the hemispherical filter bottle (332), a hemispherical diverter block (335) fixedly connected to the inner wall of the hemispherical filter bottle (332), five water accumulation chambers (336) opened on the inner wall of the hemispherical filter bottle (332), and an upper through hole (337) opened on the bottom of the water accumulation chamber (336); the bottom of the hemispherical filter bottle (332) is fixedly connected to the top of the support platform (35); The bearing assembly (32) comprises a Buchner funnel (322), a dripping pipe (323) fixedly connected to the bottom of the Buchner funnel (322), and filter paper (321) arranged on the inner wall of the Buchner funnel (322), the outer wall of the Buchner funnel (322) being fixedly connected to the inner wall of the support frame (31), the outer wall of the dripping pipe (323) being clamped to the inner wall of the sealing ring (331), and the dripping pipe (323) being arranged directly above the hemispherical diverter block (335), and the top of the filter paper (321) being overlapped with the bottom of the concrete specimen (7); The adjustment assembly (34) comprises an adjustment platform (346), a middle through hole (345) formed on the inner wall of the adjustment platform (346), an adjustment bevel gear (343) fixedly connected to the outer wall of the adjustment platform (346), and an indicator light (344) fixedly mounted on the top of the adjustment bevel gear (343); the outer wall of the adjustment platform (346) is rotatably connected to the inner wall of the support platform (35); the top of the adjustment platform (346) is rotatably connected to the bottom of the hemispherical filter bottle (332); and the indicator light (344) and the middle through hole (345) are in the same orientation; The adjustment assembly (34) further comprises a knob (341) and a transmission bevel gear (342) sleeved on an output shaft of the knob (341), the teeth of the transmission bevel gear (342) meshing with the teeth of the adjustment bevel gear (343), and the knob (341) is rotatably connected to the outer wall of the support platform (35); The water delivery assembly (36) comprises a diversion funnel (361), a plurality of lower end through holes (362) formed on the inner wall of the diversion funnel (361), and a water delivery pipe (363) fixedly connected to the bottom of the diversion funnel (361), the bottom of the diversion funnel (361) being fixedly connected to the top of the support frame (31), and the top of the diversion funnel (361) being rotatably connected to the bottom of the adjustment platform (346); The test assembly (4) comprises a test sealing shell (42), an inflatable rubber bag (43) fixedly mounted on the inner wall of the test sealing shell (42), and an upper pad (41) and a lower pad (44) overlapped on the inner wall of the inflatable rubber bag (43); the bottom of the test sealing shell (42) is fixedly connected to the top of the operating table (1), and the bottom of the upper pad (41) and the top of the lower pad (44) overlap the top and bottom of the concrete specimen (7) respectively; An immersion chamber (47) is formed between the inner wall of the inflatable rubber bag (43) and the outer wall of the concrete test piece (7); the inner wall of the immersion chamber (47) is fixedly connected to one end of the water pipe (363) via a penetration test sealing shell (42); the inner wall of the upper end pad (41) is provided with an infiltration air outlet chamber (45); and the inner wall of the lower end pad (44) is provided with an infiltration air inlet chamber (46); A gas detection delivery tube (51) is fixedly connected to the outer wall of the gas flow detector (5), and one end of the gas detection delivery tube (51) is fixedly connected to the inner wall of the permeation cavity (45) via a penetration test sealing shell (42); An inflation main pipe (61) and an inflation branch pipe (62) are fixedly connected to the outer wall of the high-pressure air pump (6); one end of the inflation main pipe (61) is fixedly connected to the inner wall of the inflation rubber bag (43) via a penetration test sealing shell (42); and one end of the inflation branch pipe (62) is fixedly connected to the inner wall of the infiltration air inlet cavity (46) via a penetration test sealing shell (42).

2. The unsaturated concrete gas permeability auxiliary detection device according to claim 1 is characterized in that: A suction filtration tube (21) is fixedly connected to the outer wall of the suction filtration pump (2), and one end of the suction filtration tube (21) is fixedly connected to the inner wall of the hemispherical filter bottle (332).

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