MAC Cosmetics Wholesale Diameter of 6.14m composit

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Diameter of 6.14m composite soil pressure shield tunneling machine

【Abstract】: In this paper, the Guangzhou Subway tunnel boring projects,[link widoczny dla zalogowanych], restructuring of 2 sets of composite design earth pressure shield to meet the high-pressure mix of soft soil and weathered rock strata conditions for tunneling construction requirements. The paper introduces the complex cutting systems and other major systems design and calculation of shield, with emphasis on tool cutter and formation conditions of the adaptive selection of technical problems.
Key words: underground tunnels of earth pressure balance shield tunneling machine
Abstract: The article incorporating running section tunnelling at Guangzhou Metro, designs to refurbish 2 Mixshields (EPBM) to satisfy construction requirements of tunnelling through high water pressure soft soil and weathered rock implicated soil. This paper presents design and calculation of Mixshield cutting system and other major systems of the shield, focusing on discussion of technical problems concerning type selection of disk cutter and soil condition adaptability
Keywords: metro tunnel, shield machine, earth pressure balance.
1 and Overseas 2000 years, China's major cities subway construction has been rapid development of subway tunnel project more and more by Shield Method, earth pressure balance shield with soil adaptability, dry excavated high degree of mechanization, driving speed, the characteristics of a small impact on the environment, are widely used. Slurry Shield slurry separation because of its high cost and complexity of the very few applications. Shield of earth pressure in general is mainly applied to soft soil, ideal for silty clay soil and general. In sand or gravel stratum boring, cutting soil must be improved lubrication, increased plastic flow of soil. Guangzhou, Shenzhen subway tunnel boring complex formation, both have soft soft rock, even hard rock, the general earth pressure shield does not apply hard and soft ground tunneling mixed, composite soil pressure due to its cutter shield equipped with the cutting of soft soil and rock more than two tools, while in Guangzhou, Shenzhen subway project of choice. Shanghai Tunnel Engineering Co., Ltd. won the bid in 1999, the construction of Metro Line 2 in Guangzhou, Haizhu Square Station - South Village Station tunnel works, length of 1.7km, the tunnel through the strata are mainly residual soil, Weathered rock, weathered rock, the weathered rock and weak weathered rock, weathered rock strength ranges from 2 ~ 46MPa, and across the Pearl River at the end of high pressure water-rich strata. Tunnel longitudinal profile shown in Figure 1 strata.

Under formation conditions and owners have been driving the use of 2 sets of about 6km φ6.14m Slurry Shield at the request of the original slurry pressurized shield for the restructuring, design, and completed the 2 sets φ6.14m earth pressure shield composite manufacture,[link widoczny dla zalogowanych], installation and excavation construction, accumulated earth pressure shield composite design and manufacturing experience.
2 Shield Selection and performance requirements of the major construction shield formation driving performance in Guangzhou, both requirements can be cut lower strength of the silty clay,[link widoczny dla zalogowanych], cutting strength of 40MPa can siltstone, marl layer, the general EPB shield and Slurry Shield balance can not be cut soft rock. Demonstrated by repeated comparison to determine the type of shield for the compound, that is, the cutting knives are equipped with a cutting disk residual soil cutting knife and cutting soft rock of the disk-type cutters. Rock cutting the shield may produce large rock, so common with the central axis of the screw conveyor mucking negative, it should use large stones can be transported out of screw conveyor belt . Sword shield plate is the key to restructuring the system and with spiral cutting machine unearthed the design, manufacture and installation. According to the requirements of owners, for the driving operation φ6.14m compound has been designated by the shield tunneling construction at the first line of the 2 sets of about 3km balance φ6.14m Slurry Shield restructuring (Figure 2).

The main technical parameters 3 Shield shield design and calculation methods, the main technical parameters including the total thrust, torque cutting cutter, screw conveyor, pipe chip assembly machines. EPB Shield composite diagram (Fig. 3).

3.1 total thrust of shield (F) shield that may be encountered in advancing the process of stable and unstable soil layer two cases Therefore, considering the total thrust of the shield, it must take into account the two cases. Total thrust of hard rock shield 3.1.1 (F hard) by the general thrust of Hard Rock Shield (required for the effective thrust of the hob cutter + Shield weight) basis. Guangzhou Metro Line 2 tunnel axis through the weathered rock band, but also through the layer of weathered rock band, rock is silty mudstone, conglomerate, conglomerate and so on. Uniaxial ultimate compressive strength fc = 31.2MPa, anti-shear strength c = 3.4MPa, according to my long-term study on the TBM shield technology, decided to adopt a disc cutter and standard combination blade cutting knife arranged to excavation of the disc tunnel. Cutter on the use of φ400mm of 41 disk-type cutters as the main rock breaking wide cross-section in order to keep the hob cutter 86 arranged to make assisted rock. Hob in the process of breaking rocks in a vertical direction of the cut into force on VF and hob in the rolling rock rolling resistance RF, and the sharp edge of the hob hob with the blunt edge required not the same thrust, 41 Disc hob thrust F1 = ΣVFi + RFi, i = 1 ~ 41 is calculated, the required effective thrust F1 hob theory 790.5 × 104N According to the laboratory and on-site accumulation, F2 should be designed for the 1025 × 104N select Fg Fg = F2 = 1025 × 104N 3.1.2 Earth Pressure Balance Shield total thrust (F soil) earth pressure balance shield in advancing the course of the following to overcome some resistance, there are shield face impedance of earth pressure force on the shield Fp, (generally the axis line can shield earth pressure balance, special circumstances should be passive earth pressure) side of the shield weight, top of the soil and water pressure , the bottom of the soil and water pressures, lateral earth pressure by the friction under the rear of equipment, Ff, and shield resistance and traction trolley shield correction process that the additional resistance Fz : F soil = Fp + Ff + Fz 3.2 geology of soft clay and sand shield, cutter cutting torque the usual formula for the T = α ・ D3 (as the torque coefficient) such a shield generally take α = 1.6 the hard rock boring cutter torque required moment much less than the soft soil or sand driving under the knife plate geological torque, therefore, the program cutter with maximum torque of soft soil at the construction of torque configuration. T = 482.6 × 104N ・ m 3.3 advance speed (v) the pace of advance is a comprehensive indicator , is the site of energy equipment,[link widoczny dla zalogowanych], tunnel construction in the horizontal and vertical transport capacity of a balanced outcome of various factors, the shield used v = 5.1cm/min ≈ 3000mm / h 3.4 chip assembling machine assembling machine feature segment is the segment of prefabricated concrete or steel shield by the end of the range of design requirements into the ring assembly, and to ring linked together to form the tunnel. So it must have to install any one segment to the specified location capability. In general, the installation process is a space segment operating process, so that people will install the assembly machine called the segment manipulator. Erector from the plate body, transmission parts, gear wheel, roller, hydraulic system and electrical control systems and other components. Physical body is steel plate as the main form of transmission components using teeth mesh, disk rotational speed of sub-fast and slow two. Assembly machine design work constitutes two parts; its trajectory assembly process to be completed by the accurate mapping, and transmission functions will have to be calculated. The main technical parameters are calculated as follows: lifting force (F) = 70kN × 2 rotary torque (TP) = 100kN ・ m ; speed (v) v1 = 0.5r/min; v2 = 1.0r/min overturning moment (TQ) assembled machine overturning moment, by a number of side to block wheel balance. Turning angle ± 200 ° erector improve stroke 650mm ; assembled machine translation travel 600mm erector jaw cylinder telescopic stroke 60mm 3.5 Screw screw conveyor function is to shield the advance of transport out of spoil from the face by the other equipment delivered to the tunnels. Speed of shield advance,[link widoczny dla zalogowanych], determines the number of unearthed an hour. Therefore, the screw conveyor is equipped with transmission capacity into account spoil the maximum forward speed of shield. At the same time, maintain the shield in the face in advance of earth pressure balance is unearthed by controlling the amount of screw conveyor to achieve, common central axis of the screw conveyor with a residue is not easy, therefore, with the actual geological conditions, with band type screw conveyor, shown in Figure 4.

Total length of screw conveyer 10m, supported by the rear 1:00, drive components for the low speed high torque motor. Part of main parameters: screw diameter D = 700mm stalk stalk screw pitch L = 700mm maximum speed nmax = 15.5r / min throughput Q = 199m3 / h (η = 100%) drive torque T = 4 × 10kN ・ m
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