Mobile Electric-Discharge Blasting Unit for Splitting off and Destruction of Rocks and Concrete

Voitenko, N V; Yudin, A. S.

doi:10.4028/www.scientific.net/kem.685.705

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…When the high-voltage impulse current is introduced, the electrons and molecules in the electrolyte collide and cause electron avalanche, which is converted into plasma. e plasma expands instantaneously and exerts an impact pressure on the surrounding objects, and then breaking is caused [18].…”

Section: Electrohydraulic Effect Methodmentioning

confidence: 99%

Research on Crushing Concrete Members by High‐Voltage Pulse Discharge Technology

Wang

2021

Advances in Civil Engineering

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High-voltage pulse discharge (HVPD) is an energy-saving, efficient, and green technique, which has broad prospects in concrete crushing. The finite element models of the concrete beam, slab, and column segments were established with ANSYS/LS-DYNA finite element software. Based on the principle of equal impact pressure, the shock wave generated by the fuse explosion caused by HVPD of 50 kJ is equivalent to the impact load of explosive blasting, and the stress of concrete beam segment was analyzed. The finite element models of the concrete beam sections were established to investigate the influence of diameter and spacing of the holes on the crushing effect of concrete beam segments. The width × height of each beam segment is 400 mm × 800 mm, and there are six types of beam segment length: 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, and 1100 mm. Two holes are drilled vertically on the surface of the width × length of each beam segment. The spacing of holes corresponding to beam segments of each length type is 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, and 700 mm, respectively. The hole depth of each beam segment is 650 mm, and there are three types of aperture: 30 mm, 50 mm, and 70 mm. The analysis results show that the crushing effect of concrete beam segments increases with the increase of aperture and the decrease of hole spacing. According to the crushing effect of the beam segments, the aperture of 50 mm, the spacing of 400 mm, and the hole end (edge) spacing of 250 mm were determined as the optimal hole layout scheme. The finite element models of concrete slabs and columns were established. The square concrete slab thickness is 140 mm and side length is 700 mm, 800 mm, and 900 mm, respectively. Double-row holes were arranged in the slabs and the aperture is 50 mm and the hole spacing is 200 mm, 300 mm, and 400 mm, respectively. The section sizes of concrete columns are 500 mm × 500 mm, 600 mm × 600 mm, and 700 mm × 700 mm, respectively, and the aperture is 50 mm and the hole distance is 400 mm. According to the results of analysis, the optimal hole distribution scheme of concrete slab and column is chosen as the aperture of 50 mm and hole distance of 400 mm. The principle of the layout of multirow holes is that the spacing of row is not more than 400 mm, and the margin is not more than 250 mm.

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Section: Electrohydraulic Effect Methodmentioning

confidence: 99%

Research on Crushing Concrete Members by High‐Voltage Pulse Discharge Technology

Wang

2021

Advances in Civil Engineering

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“…In recent years, developed countries in Europe and North America have invested heavily on HVPD crushing. For instance, Hawrylewicz et al [7] carried out rock breaking tests by electrohydraulic effect method, in which the specimen was predrilled to reduce the tensile strength of the rock, aiming to ensure uniform directional splitting and improve crushing efficiency.…”

Section: Relevant Studies Outside Chinamentioning

confidence: 99%

Research and Applications of High-voltage Pulse Discharge Crushing

Wang¹,

Zhu²

2019

EJEE

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High-voltage pulse discharge (HVPD) is a green, easy-to-operate, energy-saving and efficient technique that has been applied in many engineering fields. To promote the application of the HVPD in the demolition of concrete structures, this paper introduces different types of HVPD crushing techniques and their unique features, sums up the relevant studies on HVPD techniques, and explores the HVPD applications in rock breaking, concrete crushing, oil well deblocking and foundation engineering. In addition, the author pointed out several problems in HVPD crushing techniques: the HVPD crushing devices are too large to transport, the working voltage is excessively high, and the safety and insulation are yet to be improved. All these problems restrain the promotion of the HVPD techniques. Through the analysis, it is suggested that the working voltage should be appropriately reduced, and the discharge frequency should be increased, such as to lower the production cost, enhance operability, and improve engineering application. Keywords:high-voltage pulse discharge (HVPD), crushing, engineering applications, fuse explosion method, electrohydraulic effect method INTRODUCTIONEach year, China witnesses the completion of about 2 billion m 2 of urban buildings, and the demolition of around 460 million m 2 [1]. As urbanization picks up pace, the demolition demand is continuously on the rise. However, the traditional concrete crushing methods, ranging from mechanical crushing to blasting, have many common defects, namely, high cost, long duration and low efficiency. This calls for a green, efficient and energy-saving technology to break the concrete in densely distributed urban buildings.High-voltage pulse discharge (HVPD) provides an effective solution to the said problem. The HVPD is a technology that accumulates low-power energy over time and releases it within a short period as high-voltage energy. As early as the mid-20 th century, the USSR has applied the HVPD in fields like rock breaking. In the 1970s, the Tomsk Polytechnic University discovered that the shockwaves generated from high-voltage breakdown of solid materials (e.g. rocks and concrete) can cause material damages [2]. This phenomenon received much attention from both the USSR and the US. The former hailed the HVPD as a major scientific invention after computer and laser.In recent years, the HVPD has become a research hotspot and proliferated to the civilian industry. There are three main features of this technology. Firstly, the HVPD is a green technology with no noise, dust or harmful gas, which are commonplace in traditional concrete crushing methods. Secondly, the HVPD is easy to operate by common workers. Before HVPD crushing, the operator only needs to place the discharge electrode in the electrolyte of the object, and control the switch to complete the crushing. Thirdly, the HVPD is highly energy-efficient. Compared with the other green crushing methods (e.g. static crushing and electric heating), the HVPD can achieve excellent breaking effect within a shor...

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Experimental study on crushing of concrete columns by high voltage pulse discharge

Wang

2022

Case Studies in Construction Materials

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Mobile Electric-Discharge Blasting Unit for Splitting off and Destruction of Rocks and Concrete

Cited by 5 publications

References 6 publications

Research on Crushing Concrete Members by High‐Voltage Pulse Discharge Technology

Research on Crushing Concrete Members by High‐Voltage Pulse Discharge Technology

Research and Applications of High-voltage Pulse Discharge Crushing

Experimental study on crushing of concrete columns by high voltage pulse discharge

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