A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Existing line lower row pile enclosure structure and construction method thereof
The invention belongs to the technical field of civil construction engineering, and particularly provides an existing line lower row pile enclosure structure and a construction method thereof. According to the existing line lower row pile enclosure structure, a firm overhead system is formed by arranging overhead auxiliary beams, row piles and fulcrum piles under an existing railway, the existing line is supported and protected, the excavation range of s foundation pit under the railway during cast-in-place construction is more effectively reduced, and when some important facilities exist nearby the planned construction site and cannot be moved and changed, protection and slope closing do not need to be additionally conducted on the foundation pit any more; when a field soil layer is a soft stratum, soft soil in a passive area is reinforced through mutually-meshed jet grouting piles, the mechanical property of a soil body in the passive area is improved, more passive area resistance is provided for horizontally-stressed enclosure row piles, and a tunnel bridge base reinforcing area is arranged between passive reinforcing areas to conduct reinforcing treatment on an existing roadbed and the soft stratum; and in addition, a mattress layer and a reinforcing layer are further adopted, so that the supporting capacity of the whole row pile enclosure structure when a tunnel bridge is built under the existing railway is improved.
本发明属于土木建筑工程技术领域，具体提供了一种既有线下排桩围护结构及其施工方法，通过在既有铁路下设置架空便梁、排桩和支点桩来形成牢固的架空体系，不仅对既有线路起到支撑和保护作用，更有效减少了现浇施工时铁路下基坑开挖的范围，当拟建场区附近存在一些重要设施无法迁改时，不再需要额外再对基坑进行防护收坡；当场地土层为软弱地层时，对被动区的软土采用相互咬合的旋喷桩进行加固，改善被动区土体的力学性能，为水平受力的围护排桩提供更多被动区抗力，并在被动加固区之间设置地道桥基底加固区，对既有路基和软弱地层进行加固处理；此外，进一步采用褥垫层和加固层，提高了整个排桩围护结构在既有铁路下修建地道桥时的支撑能力。
Existing line lower row pile enclosure structure and construction method thereof
The invention belongs to the technical field of civil construction engineering, and particularly provides an existing line lower row pile enclosure structure and a construction method thereof. According to the existing line lower row pile enclosure structure, a firm overhead system is formed by arranging overhead auxiliary beams, row piles and fulcrum piles under an existing railway, the existing line is supported and protected, the excavation range of s foundation pit under the railway during cast-in-place construction is more effectively reduced, and when some important facilities exist nearby the planned construction site and cannot be moved and changed, protection and slope closing do not need to be additionally conducted on the foundation pit any more; when a field soil layer is a soft stratum, soft soil in a passive area is reinforced through mutually-meshed jet grouting piles, the mechanical property of a soil body in the passive area is improved, more passive area resistance is provided for horizontally-stressed enclosure row piles, and a tunnel bridge base reinforcing area is arranged between passive reinforcing areas to conduct reinforcing treatment on an existing roadbed and the soft stratum; and in addition, a mattress layer and a reinforcing layer are further adopted, so that the supporting capacity of the whole row pile enclosure structure when a tunnel bridge is built under the existing railway is improved.
本发明属于土木建筑工程技术领域，具体提供了一种既有线下排桩围护结构及其施工方法，通过在既有铁路下设置架空便梁、排桩和支点桩来形成牢固的架空体系，不仅对既有线路起到支撑和保护作用，更有效减少了现浇施工时铁路下基坑开挖的范围，当拟建场区附近存在一些重要设施无法迁改时，不再需要额外再对基坑进行防护收坡；当场地土层为软弱地层时，对被动区的软土采用相互咬合的旋喷桩进行加固，改善被动区土体的力学性能，为水平受力的围护排桩提供更多被动区抗力，并在被动加固区之间设置地道桥基底加固区，对既有路基和软弱地层进行加固处理；此外，进一步采用褥垫层和加固层，提高了整个排桩围护结构在既有铁路下修建地道桥时的支撑能力。
Existing line lower row pile enclosure structure and construction method thereof
一种既有线下排桩围护结构及其施工方法
HUANG GUANGHUI (author) / BAO CHUXIONG (author) / ZHAO JIANFENG (author) / MA XIAOBING (author) / YANG LIFANG (author) / WU SHUAIFENG (author) / SHI ZHIGUO (author) / LI LINLI (author)
2021-08-10
Patent
Electronic Resource
Chinese
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