scholarly journals Cognition, Application and Discussion on Shaped Charge Hydraulic Smooth Blasting Technology

2021 ◽  
Vol 4 (2) ◽  
pp. 5
Author(s):  
Xiuyong Ni ◽  
Suqin Han ◽  
Peng Li ◽  
Xiwu Wei
Keyword(s):  
Comprehensive Evaluation ◽  
New Technology ◽  
Construction Technology ◽  
Tunnel Excavation ◽  
Main Method ◽  
Excavation Process ◽  
New Construction ◽  
China Railway ◽  
Operation Cycle ◽  
Smooth Blasting

In the past, the main method of tunnel excavation in China was drilling and blasting, but the biggest shortcoming of the traditional drilling and blasting method is that it is easy to cause serious overexcavation and underexcavation. At the same time, the operation cycle time of this method is long, which leads to a serious waste of resources. Not only that, a large number of toxic gases and dust produced after blasting also do harm to the health of construction workers. So this is an urgent need for a new construction technology to solve this worldwide problem. In this situation, the leading experts in the field of tunnel, "The survey and design master of China" Shi Yuxin, Liu Pei, and well known expert in explosion field, yan-sheng ding, professor Chen Chengguang and Gu Yicheng, the experts group, cooperate with The Fifth Branch of China Railway 18th Bureau in northwest project management department, developed a new technology. This technology has passed the appraisal of scientific and technological achievements organized by Tianjin Science and Technology Commission, which is shaped hydraulic smooth blasting technology. The comprehensive evaluation of the technology is "international leading" level.This paper is mainly aimed at the drawbacks of drilling and blasting construction,combined with the author's cognition and discussion on the introduction of the new technology of cumulative hydraulic blasting and the practical application effect in the tunnel excavation process of the fourth company of China Railway 14th Bureau Group in the second division of the 9th bid section of Zhangjihuai Railway in Huainan Province.

scholarly journals A New Technology for Smooth Blasting without Detonating Cord for Rock Tunnel Excavation

2020 ◽  
Vol 10 (19) ◽  
pp. 6764
Author(s):  
Chunde Ma ◽  
Weibin Xie ◽  
Zelin Liu ◽  
Qiyue Li ◽  
Jiaqing Xu ◽  
...  
Keyword(s):  
Production Efficiency ◽  
New Technology ◽  
Economic Benefits ◽  
Critical Distance ◽  
Production Costs ◽  
Emulsion Explosive ◽  
Tunnel Face ◽  
Tunnel Excavation ◽  
Rock Tunnel ◽  
Smooth Blasting

In this paper, the aim is to achieve safe, rapid excavation of an extra-long, large-cross-section highway tunnel in Eastern Tianshan, as well as to reduce production costs, simplify production processes, reduce cycle time, and improve production efficiency. In this study, we explored a new technology for smooth blasting without a detonating cord. A series of sympathetic detonation experiments were conducted in the tunnel face to determine critical distances. The critical distance for No. 2 rock emulsion explosive under blasthole constraints was successfully measured to be approximately 1.0–1.1 m. Based on the critical distance, a new charging structure was designed for tunnel excavation. To assess the influence of the new charging structure on blasting performance, its economic benefits, and its feasibility, full-section tests were performed in the East Tianshan Tunnel. The application of the new charging structure produced good smooth blasting results. It not only simplified the charging process and produced smooth blasting without detonating cord in peripheral holes, but also guaranteed normal excavation, an appropriate tunnel profile, and reasonable overbreak and underbreak volumes. This had remarkable economic benefits and possesses better promotional value.

scholarly journals New Construction Technology of a Shallow Tunnel in Boulder-Cobble Mixed Grounds

2020 ◽  
Vol 2020 ◽  
pp. 1-20 ◽  
Author(s):  
Tong Liu ◽  
Yujian Zhong ◽  
Zhihua Feng ◽  
Wei Xu ◽  
Feiting Song ◽  
...  
Keyword(s):  
Surrounding Rock ◽  
Construction Technology ◽  
Construction Process ◽  
Tunnel Excavation ◽  
Supporting System ◽  
Highway Tunnel ◽  
Bulk Medium ◽  
New Construction ◽  
Secondary Lining ◽  
Design And Construction

As a typical granular bulk medium, problems are common in boulder-cobble mixed grounds, such as easy collapse and instability and difficult effective support for large-section tunnel excavation. Tunnels constructed in BCM grounds are rare still, and there is a big gap between the design and construction of tunnels. Based on the Nianggaicun highway tunnel crossing the BCM grounds, the construction technology of tunnel in BCM grounds is studied by means of literature investigation and field survey. Here are the main conclusions: the overall deformation of surrounding rock is quite small; the pressure distribution of surrounding rock is small and loose pressure is dominant, and the safety reserve of secondary lining is large. The deformation process of surrounding rock concentrates on the construction stage. During the construction process, there are many problems, such as serious overexcavation, difficulty of bolt penetration, and continuous rock fall. In this paper, a three-bench complementary cyclic excavation method is proposed, which replaces the original CD and CRD methods. Meanwhile, the supporting system is optimized. The results show that the disturbance of surrounding rock is reduced, while the safety of construction process and the reliability of structure are increased. The new excavation method and optimized supporting system are expected to fill the gap between design and construction of tunnel in BCM grounds and provide reference for construction of such tunnels in the future.

New Technology of Installing the Attached Self-Climbing Tower Steel Gantry Cranes

2014 ◽  
Vol 484-485 ◽  
pp. 245-253
Author(s):  
Ming Guang ◽  
Hong Sheng Li ◽  
Hua Guo Yang
Keyword(s):  
New Technology ◽  
Plate Thickness ◽  
Gantry Crane ◽  
Maximum Height ◽  
Construction Technology ◽  
Pipe Segment ◽  
New Construction ◽  
Girder Bridge ◽  
Gantry Cranes ◽  
Bridge Tower

The Liujiaxia Bridge is 536 m span steel truss stiffening Girder Bridge, tower with double-column steel concrete structure, which is the world's largest diameter, the largest steel plate thickness of concrete pylon. Sarasota manufactured using standard pipe segment, group fight scene segment piecewise hoisting tower segment perfusion within the micro-expansion concrete construction technology, tower maximum height of 61.5 meters. This paper describes a piecewise Sarasota steel installation, piecewise perfusion within the micro-expansion concrete tower new construction method - attached to a self-climbing tower bridge gantry crane mounted pylon construction technology of large steel components. Of the "entity attached to the pylon installation of equipment by section climb" design, composition and construction applications are described in detail.

Experiment Study on Air-Deck Divided Decoupling Charge in the Subway Construction

2012 ◽  
Vol 226-228 ◽  
pp. 1500-1503
Author(s):  
Ren Shu Yang ◽  
Yu Long Che ◽  
Qiang Sun ◽  
Shao Min Zhang ◽  
Chuan Huo
Keyword(s):  
Reference Value ◽  
Experiment Study ◽  
Charge Structure ◽  
Excavation Process ◽  
Blasting Excavation ◽  
Design Requirements ◽  
Subway Construction ◽  
Smooth Blasting ◽  
Air Deck ◽  
Better Than

At present, smooth blasting are widely used in urban subway excavation. To improve smooth blasting effect in the blasting excavation process of urban subway, this paper took the fourteen section of Qingdao subway as the background, confirmed the reasonable interval of surrounding holes by combining the theoretical calculation and the actual scene; improved the smooth blasting effect obviously by changing the charge structure of periphery holes. The results of the experiment showed that adopted air-deck divided decoupling charge, when interval of surrounding holes was 350mm, and the minimum burden was 500mm, the smooth blasting effect was better, and the half eye tracking rate was beyond 85%, which meet the design requirements. The experiments proved that when adopted air-deck divided decoupling charge, the blasting effect was better than adopted concentrated charge, so there will be some reference value to the later engineering.

scholarly journals The Comprehensive Evaluation System of Construction Technology

1993 ◽  
Vol 1 ◽  
pp. 121-134
Author(s):  
Masahiko KUNISHIMA ◽  
Tsunemi WATANABE ◽  
Hyun Yang SHIN ◽  
Masahide HORITA
Keyword(s):  
Evaluation System ◽  
Comprehensive Evaluation ◽  
Construction Technology ◽  
Comprehensive Evaluation System

scholarly journals Optimal Design and Practice of the Construction Scheme for Laying the Whole Track Bed on the Subway Ballastless Track

2020 ◽  
Vol 165 ◽  
pp. 04003
Author(s):  
Chen Hui ◽  
Qi zhenfang
Keyword(s):  
Construction Industry ◽  
Modern Society ◽  
Rail Transit ◽  
Construction Technology ◽  
Ballastless Track ◽  
Construction Scheme ◽  
New Construction ◽  
Design And Practice ◽  
Stable Development ◽  
Modern Building

In the development of modern society, our country attaches more importance to the development of the construction industry, and strengthens the supervision, so that the construction industry can be developed to the mode of industrialization. That combining with the construction needs of prefabricated concrete assembly in our country and taking comprehensive analysis of various factors and application, can enhance the structural stability and safety of prefabricated concrete assembly, thus can meet the needs of the modern building industrialization development, and improve the overall quality and efficiency. In the development of subway transportation field, laying the whole track bed of Ballastless track is an important core work, which is the new construction of rail transit. This paper made perfect management system, carried out all kinds of work, improved the construction technology of the whole track bed and perfected the construction plan, with the result of prolonging the service life of the subway ballastless track and promoting the stable development of modern society in our country.

scholarly journals TUNNEL PORTAL INSTABILITY IN LANDSLIDE AREA AND REMEDIAL SOLUTION: A CASE STUDY

2019 ◽  
Vol 59 (5) ◽  
pp. 435-447 ◽  
Author(s):  
Farhad Farhadi Ayoublou ◽  
Majid Taromi ◽  
Abbas Eftekhari
Keyword(s):  
Geological Structure ◽  
Construction Process ◽  
Site Location ◽  
Landslide Area ◽  
Tunnel Excavation ◽  
Excavation Process ◽  
Geological Formations ◽  
Zagros Region ◽  
Tunnel Portal

The construction of tunnel portals in mountainous or slope areas often involves problems, which are closely related to factors, such as slope topography, geology, geotechnics, construction geometry and the tunnel excavation method. The activation of landslides or the acceleration of these events is one of the main challenges faced in the construction of tunnel portals. In this paper, we address the instability problem in Sabzkuh tunnel portal that has been excavated with a complex geological profile and high seismicity in Iran’s High Zagros region. The complexity and intense heterogeneity in geological formations, land acquisition problems and the lack of appropriate monitoring programs led to the instability of the tunnel portal. The excavation process started without applying appropriate techniques for a ground stabilization. The use of inappropriate tunnel excavation methods for this unstable geological structure resulted in an activation of an old Solaghan fault and several collapses in the tunnel. Crossing the collapsed areas and reinforcing the tunnel portal took about 7 months and imposed heavy costs on the project. This case study deals with the importance of the choice of the site location, ground and underground monitoring, analysing and summarizing the collected data in order to prepare a geological model before and during the construction process.

scholarly journals Application of Smooth Blasting in Yazhugou Tunnel

2019 ◽  
Vol 136 ◽  
pp. 04038
Author(s):  
Xiaolin Wang ◽  
Wei Yin
Keyword(s):  
Resource Allocation ◽  
Construction Technology ◽  
Tunnel Blasting ◽  
Smooth Blasting ◽  
Yalong River ◽  
Highway Project

This paper takes Yazhugou Tunnel, a highway project in the upper reaches of the Yalong River as the example to summarize the application of smooth blasting in the Yazhugou Tunnel from the aspects of the feasibility, resource allocation, blasting parameters, drilling and blasting technology and the guarantee measures, with the construction characteristics of the tunnel blasting, the type of surrounding rocks, construction technology and cost taken into consideration.

Comparative Analysis of the Influence of Different Construction Technology for Excavation on Adjacent Tunnels

2014 ◽  
Vol 638-640 ◽  
pp. 884-887
Author(s):  
Yong Gang Du ◽  
Jing Cao ◽  
Zu De Ding
Keyword(s):  
Lateral Displacement ◽  
Internal Force ◽  
Calculation Model ◽  
Construction Technology ◽  
Tunnel Structure ◽  
Lateral Deformation ◽  
Foundation Pit ◽  
Engineering Construction ◽  
Excavation Process ◽  
Calculation Results

Based on the project of a foundation pit engineering adjacent to existing tunnel of Kunming metro line 1, a 3D calculation model is established in consideration the interaction of foundation pit support structures, tunnel structure and soil. In this paper, the authors have simulated the foundation pit excavation process in three conditions, and analyzed the changing laws of the lateral displacement and internal force of the tunnel induced by adjacent excavation under different conditions. Calculation results show that the distributions and the values of the displacement and internal force of the tunnel are obviously different under three different construction technologies, and the “jump dig” is the optimum excavation scheme due to the restriction in the excavation of foundation pit, and the lateral deformation of tunnel structure is smallest in this condition. The conclusion can provide a theoretical basis for similar excavation engineering construction.

AFTER TREATMENT DOMESTIC SEWAGE WITH ERSHOVA LOADING

2012 ◽  
Vol 2 (2) ◽  
pp. 59-62
Author(s):  
Yu. V MURADYaN ◽  
S. Yu TEPLYKh
Keyword(s):  
Waste Water ◽  
Domestic Sewage ◽  
Technological Scheme ◽  
Treated Wastewater ◽  
Construction Technology ◽  
Wastewater Purification ◽  
Main Method ◽  
Water Fish

Widespread now technological scheme and construction technology of wastewater do not provide normative qualitative parameters that correspond to the requirements of the water fish-economical ponds.The limited financing of construction of new sewage is the main method of improving the reconstruction and/or intensification of existing sewage systems.Now for the intensification of the process of purification of biologically treated wastewater purification filter with the proposed design of the load which ershov fully satisfies modern requirements on quality of discharged waste water into a reservoir.

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