Abstract: A method for reducing blasting vibration of tunneling includes the steps of: dividing the cutting holes into several groups according to different cutting methods; conducting layout and test blasting on one group of cutting holes; testing blasting parameters for the layout and test blasting; calculating an interval t; conducting layout and test blasting on at least two groups of cutting holes again; testing blasting parameters for the layout and test blasting of each group for the second time; taking the minimum interval t of each group as the interval for formal blasting of the remaining groups of cutting holes. The use of the characteristics of the wave in the invention can superpose the peaks and troughs of the vibration wave, and further cancel out mutually; reduce the peaks of the blasting vibration and fill the troughs of the blasting vibration.

Abstract: A wetland system has a wetland structure and a wastewater treatment device. The wetland structure has several planting areas surrounded by hoardings, several planting frames arranged in the hoardings, growing substrates provided in the planting frames, and wetland plants growing on the growing substrates. The wastewater treatment device has a bar screen, a regulating tank, a hydrolysis acidification tank, a contact oxidation tank, an MBR membrane tank, and a clean water tank that are in communication with each other in sequence of waterflow and arranged underground. The bar screen is provided with several bars therein, a lift pump is connected between the regulating tank and the hydrolysis acidification tank, a drainage pump is provided between the MBR membrane tank and the clean water tan. The planting area is connected to the bar screen via pipelines, and the clean water tank is connected to the planting area via pipelines.

Abstract: The invention discloses a device and a method for accurately fixing an internal waterstop in a lakebed tunnel, comprising two supporting bars arranged in parallel, two transverse clamping bars arranged in parallel between the supporting bars, vertical clamping bars arranged on the transverse clamping bars, wherein the supporting bars, the transverse clamping bars and the vertical clamping bars are mutually perpendicular, at least two vertical clamping bars are arranged on each transverse clamping bar, and the vertical clamping bars are arranged at the inner side of the transverse clamping bars. The beneficial effects of the invention are as follows: With vertical clamping bars that clamp the waterstop, the invention can limit the movement and rotational degree of freedom of the waterstop within in the space, to avoid displacement of the waterstop, thus making the construction more productive.

Abstract: A pile pouring structure includes a steel reinforcement cage, a limiting ring arranged on the outer side of the steel reinforcement cage, a plurality of PVC pipes arranged in the steel reinforcement cage, a cut-off layer arranged on the limiting ring, a two-dimensional code display board arranged in one-to-one correspondence with the steel reinforcement cage, the cut-off layer is annular. The two-dimensional code display board is provided with a two-dimensional code which is scanned to enter an information input interface. Information management is achieved in the pile construction process by scanning the two-dimensional code for inputting pile body strength information, thereby improving the work efficiency. The cut-off layer is used as an interface between a pile body and a pile head so that a part needing to be broken is rapidly positioned. The pile head at a part above the cut-off layer is broken so that the cut-off layer is capable of protecting a lower structure.