Pressure cell fast positioning and fixing device

Abstract

The present invention relates to a pressure cell fixing device. The pressure cell fixing device is composed of a carrying base and a lifting bracket; the carrying base is semi-closed hollow cylinder-shaped; a fine adjustment plate is movably arranged in the cavity of the carrying base; the bottom of the carrying base is symmetrically provided with four fine adjustment bolts; the upper end heads of the fine adjustment bolts are matched with the bottom of the fine adjustment plate; the lifting bracket is composed of an upper spiral bracket, a lower spiral bracket and a rotating handle; the upper end head of the upper spiral bracket is fixedly connected with the bottom of the carrying base; the device can rise and descend rapidly by adjusting the rotating handle; and the complete attachment of a pressure cell to the surface of surrounding rock can be realized by means of the fine adjustment bolts, an optimal contact effect can be achieved, and accurate measurement can be realized. The pressure cell fast positioning and fixing device of the invention has the advantages of reasonable structure, simple installation, high environmental adaptability and fast and flexible operation, and is especially suitable for the fast positioning and fixing of a pressure cell between tunnel surrounding rock and a steel arch support structure in underground construction.

Description

technical field [0001] The invention relates to a pressure box fixing device, in particular to a pressure box fast positioning and fixing device used between tunnel surrounding rock and steel arch support structure in underground engineering. Background technique [0002] At present, in the process of remote monitoring of many mountain tunnels in my country, in order to obtain the initial detailed vault pressure value and its change law in real time, grasp the relaxation and change characteristics of the surrounding rock, so as to quickly predict the appropriate supporting time for the surrounding rock, To achieve the best support effect, on-site monitoring personnel widely use pressure cells, which are effective and powerful smart sensors. However, due to the unevenness of the surrounding rock surface of the vault and the frequent occurrence of over-excavation phenomena in mountain tunnels after construction blasting, it is difficult for field workers to find A suitable pre...

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Problems solved by technology

Although this type of method has the advantage of simple operation, there are still certain problems: that is, this type of device lacks a height adjustment mechanism. The lack of a suitable force location makes it impossible to bury, resulting in the failure of the monitoring task. At the same time, because the fixed iron wire itself and the bolt have a certain thickness, when it covers the surface of the pressure cell, the pressure cell and the measured object will change from the original complete "surface- Surface" contact becomes partial "surface-surface" contact, which has a certain impact on the measurement results of the pressure cell (Chinese utility model patent application number 201220698095.5, the patent name is "pressure cell fixing device", the application case The pressure cell The "iron wire + bolt + box groove" mode adopted has a delay in measurement time and measurement errors; the Chinese utility model patent application number 201320269570.1, the patent name is "soil pressure box fixing device", which provides a "iron wire + tray" "Bundling, and then welding the whole pallet to the immovable body to fix the pressure box, but the process is complicated, the requirements for the staff themselves are high, and there is no effective protection device for the pressure box)

[0005] (2) Widely used mechanical fixation: At present, the mechanical fixation device based on physical clamping is widely used. Since its fixation mainly depends on the preload of the clamping plate to the pressure box, its anti-seismic ability is poor. During construction blasting, the fixing device is easily affected by the vibration and loosens, (Chinese patent application number 200810246303.6, the patent name is "earth pressure box embedding device and embedding method thereof", the application discloses a kind of slotting on the sliding guide rail and The pressure box fixing device with the limit plate installed is to fix the pressure box by inserting the limit plate under the premise of determining the basic position of the pressure box. However, because it is difficult to predict the specific operation conditions of the buried position in advance, the choice of the slotting position exists. Great uncertainty; China Utility Model Patent Application No. 201320552313.9, the patent name is "Tunnel Pressure Box Fixing Device". To the pressure box, so as to realize the fixing device of the pressure box, but it does not take into account that the fixing bolt itself has a certain degree of mobility, and cannot provide long-term preload and loosen, resulting in measurement failure)

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