Mobile large-scale special anti-permeability test device

Abstract

The invention provides a mobile large-scale special anti-permeability testing device. The device comprises a control console, a constant-pressure no-tower water supplier, a water tank, a water storagepressure-stabilizing tank, and test piece cover dies; two groups of working areas are arranged at the right side of the base in parallel front and back; each working area comprises four stations arranged from left to right, and test piece cover dies are arranged on four stations at the back end; two test piece cover dies and two plate turnover unloading devices are arranged at four stations at the front end, two test piece cover dies are respectively located at the leftmost side and the rightmost side, and two plate turnover unloading devices are located between two testing piece cover dies;rotary hoisting devices are respectively among four stations at the left side of the two groups of working areas and among four stations at the right side; six test pieces can be simultaneously manufactured every time, the test piece cannot break away from the die after being manufactured, the permeability test is performed after the maintenance is accomplished, the program is simplified, the secondary sealing is saved, and the result is reliable, the vehicle-mounted monitoring and the remote monitoring are realized, and the device is labor-saving and convenient.

Description

technical field [0001] The invention provides a test device suitable for preparing sprayed concrete specimens and testing its impermeability performance, in particular to a mobile large-scale special impermeability test device. Background technique [0002] Compared with ordinary concrete, shotcrete has the characteristics of low water-cement ratio, high cement content, small aggregate, etc., and contains more air bubbles of moderate size, uniform distribution, and non-communication. It is denser than molded concrete and has more High anti-seepage performance, therefore, is widely used in hydraulic engineering, underground and other civil engineering with anti-seepage requirements, such as dam concrete, tunnel support concrete and so on. [0003] The impermeability of concrete is an important indicator reflecting the durability of concrete, and it is also an important factor in the quality of projects in the fields of underground construction, water conservancy, civil air de...

AI Technical Summary

Problems solved by technology

[0004] The anti-permeability test of the traditional method is difficult, the data fluctuates greatly, it takes a long time, the success rate is not high, and the reliability is not high. Specifically, the main problems are as follows: (1) The test piece is difficult to seal and the effect is not good. Existing sealing methods include heat-sealing method, cold-sealing mold method, and method of adding pre-embedded pressure pipes in the test piece. Heat, heat the industrial paraffin to 50-60°C to melt into a liquid state, and try to seal the gap after the paraffin is cooled and solidified. This procedure greatly increases the time and capital costs. Due to the long sealing time between the test mold and the sample, the sealing process is complicated. The sealing is very difficult, and it cannot guarantee the complete sealing between the test piece and the test mold during the test, so that the pressure water may seep out from the gap between the test piece and the test mold during the test, resulting in the failure of the test, or the test is successful but has However, the method of adding pre-embedded pressure pipes in the specimen only tests the penetration test of local seepage water on concrete, and it is difficult to represent the test of pressure water on large-area water seepage of shotcrete, and its applicability is not strong. cement-based waterproof layer seal, special sealant, rubber sealing ring, epoxy cement and other methods, but the actual effect needs to be verified; (2) the test data is discrete and the result error is large. On the one hand, the pressure water may flow from The gap in the sealing area between the test piece and the test form seeps out. On the other hand, because the concrete material is a heterogeneous body, there are often uneven compactness and other internal defects during pouring, which makes it difficult for small-sized test pieces to reflect the actual situation. The impermeability performance, the measured seepage pressure is high, and the measured result is unreliable; (3) The impermeability pressure is small, with the continuous improvement of concrete structure design standards, and more and more underground buildings, it is also more and more The deeper the depth, the higher the impermeability requirements for concrete materials. Therefore, the impermeability sealing method used in the past can no longer meet the requirements. The test pieces above P10 are often due to the problem of sealing materials. When the impermeability test is pressurized to high pressure There was leakage of the sealing material layer, but it could not reflect the impermeability index of the concrete, which led to the failure of the experiment

[0005] Our unit has developed a large-scale anti-seepage test device, and used this device to complete the anti-seepage test task of a certain subway project, and initially succeeded. Taking the large-scale anti-seepage test device developed by our unit as an example, the existing anti-seepage test The device has the following deficiencies that need to be improved: (1) The sealing method adopts the heat sealing method, that is, Vaseline and paraffin polymer are used as sealing materials, and a 10kW large heater is used to preheat the test piece mold for sealing. The impermeability test of large concrete specimens is sealed, but in terms of time, heating and demoulding are time-consuming, and heating and melting are required for the next test. The whole process takes a long time and costs a lot; in terms of difficulty, heating Mold testing needs to be very careful, especially the temperature needs to be mastered. This process is difficult for the test personnel to control, and it is easy to cause poor sealing and poor repeatability. From the perspective of environmental hygiene, the molten paraffin is not only unpleasant but also harmful to the human body. Environmental hygiene Poor, from the perspective of impermeability level, high impermeability level is difficult to meet; (2) integration of mold entry and demoulding, due to the large size of the test piece, about 0.8m 3 , with a weight of 1.9t, and a mold set weighing 0.6-0.8t. Lifting equipment was used to hoist the anti-seepage test piece, and insufficient consideration was given to the integration of anti-seepage device rotation and hoisting, flap unloading and transfer; (3) test Only one set of molds is designed, and the impermeability test takes a very long time. In addition, the data is scattered and the value of the data is not reasonable; (4) The vehicle is mobile, and the device needs to transport the test piece Back to the unit, long-distance transportation is likely to cause damage to the test piece, the quality is difficult to guarantee, and it is impossible to go to the actual project site for testing; (5) The appearance of the test piece set mold, the test piece set mold of the device is a square power structure with four corners partially reinforced Type, divided into two sections with a height of 330mm and 470mm, the bottom is a belted bottom plate with water collection, the upper and lower two sets of molds and the bottom plate are connected by bolts, and the simple steel plate welding structure is adopted. The overall shape is a cylinder, which increases the sealing Difficulty; (6) In terms of automatic pressure control, the accuracy of pressurization needs to be improved due to the absence of an automatic pressurization control device; (7) In terms of intelligence, most of the concrete impermeability instruments available on the domestic market are still traditional automatic pressurization, Manual water addition and data recording mode, that is, someone needs to be on duty during the test period, manually transcribing the anti-seepage test data, manually compiling the anti-seepage test report, manually judging the water seepage of the station, and manually closing the water valve of the water seepage station. The whole process is very cumbersome and laborious , it is very easy to affect the test results due to negligence leading to data confusion

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