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Jiangxi Jiangxi branch closure Main Bridge Design


nl, roots thick 60cnl, end thick 15cnl. 2.2 The closing segment in the closing segment rigid support beam across the top and bottom chambers were embedded 2cln diameter of 2.5cm thick steel plate and steel, welded I-beam on which the 36a. Closing segment rigid support structure shown in Figure 1. A. A cut Lrr. · L,[link widoczny dla zalogowanych], a _ system. . I ,--'' feast. / 36aT type steel =, 1314 closing segment 413'-_】 36a I-beam, · nInIn ● i200 + A3 closure construction elements of Figure l closing segment rigid support structure (unit: cm) 1) the closing segment with expansion of concrete and require early strength, placement should be conducted at low temperature as possible,[link widoczny dla zalogowanych], and as soon as possible,[link widoczny dla zalogowanych], ensure that the new process of pouring concrete in the temperature rise, in a state of compression to reach the final setting. 2) Cross-closure, the bottom slab of the stress state of the compression into tension, in order to bottom reserve enough stress to meet the closure after the force required, the use of pre-pressure tank method closure in the cross, that is, the closure In the closing segment ends before the Department of tank water, while pouring concrete side of the water. 3) rigid support the closure process as an important force members,[link widoczny dla zalogowanych], in addition to itself must have sufficient strength and stability, we must also ensure the total section 1l1 of the Highway and Transport Highways & AutomotiveApplications117 Mountain Expressway Bridge Design and Construction of Zhan Chen apricot, Zhao Heng new, Chen Xian. (1. Shaoguan City Highway Engineering Co., Ltd., Shaoguan 512003; 2. Xinjiang Road & Bridge Corporation,[link widoczny dla zalogowanych], the second Engineering Department, Changji 831100:3. Tengen Changji, construction supervision companies, Changji 831100) Abstract: mountain geology, topography characteristics of mountain highway bridge and culvert construction according to the practice of mountain highway bridge and culvert design calculations, layout and reinforcement were discussed. Key words: Bridge; highway; design and construction of CLC: U442.5 Document code: A Article ID :1671 -2668 (2005) 06-0117-03 survey and design of the road, the setting is a small bridge and culvert an important part of highway drainage design is directly related to the stability of roadbed and construction cost. Mountainous terrain, steep mountains, steep Goushen for highway construction has brought many difficulties, small bridges and culverts in the correct layout is much more important. Design and construction of small bridges and culverts in the highway construction is the key. 1.1 1 Design flow calculation method most steep mountain valley current is swift flow calculation in line with the actual extent of flooding is directly related to the safe use of the line and project investment, therefore, must be identified in the survey and design meet the line adopted during the local conditions of the flow calculation. When using the empirical formula commonly used in general need to be revised according to local conditions. Revision in the formula should take full account of the small mountain drainage area, watershed steep slope, drainage length is short, significant differences between the watershed vegetation and other features. Learn from other mountainous highway peak flow calculation formula is as follows according to the actual experience to revise the formula: CFc ~ IV4 ~ × bogey (ap = Sp / tn time) where: F is the drainage area; for basin slope (weighted average available ); L is basin length (commencing from the watershed); n is the relative design flood frequency of storm intensity; S design flood frequency for the relative power of the rain; C, Go, Po is a parameter. n1 +), O6 · 7Go = 1 + moPo (3) Po = (4) 1 a priority n, where: o,), o, 0, A4, No are with the basin geology and vegetation-related parameters. It permits both ends of beam embedded parts of the welding quality. Welding response that quickly carried out. 4) After the closure of the side span. Should immediately lift the temporary restraint on both sides of Pier Top of construction; in the cross-closure, should immediately lift the temporary construction in the Pier Top bound to complete the system conversion. 5) In order to reduce the temperature, the net 0 of welding and supported the lifting of the temporary restriction should be carried out at low temperatures as much as possible. 4 Conclusion closing segment continuous beam construction is a cantilever bridge construction casting a critical step. Jiangxi Jiangxi branch side Main Bridge, closing across the design to meet the construction phase and use phase of the force needs. About two full bridge closure has been successful, can provide a reference for the construction of similar bridges.
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