CN-122013619-A - High-fill roadbed system for rapidly implementing narrow space of busy trunk line and construction method

Abstract

The invention provides a high-fill roadbed system for rapidly implementing a narrow space of a busy trunk, guard piles are arranged along the periphery of a foundation pit for constructing a frame bridge so as to support a region corresponding to the pushing construction of the frame bridge, a support roadbed is positioned in the surrounding region of the guard piles and is close to a pushing path of the frame bridge, steel supports are erected between the support roadbed and the guard piles so as to form an overhead region corresponding to the pushing path of the frame bridge, steel sheet piles are positioned at two sides of the support roadbed, cross beams corresponding to the steel sheet piles are respectively arranged at two sides of the support roadbed, the two cross beams are connected through prestressed tendons, the original railway roadbed is used as an independent support in the construction process, firstly, the pre-installation can be carried out before the construction of the frame bridge, the reply of the roadbed support system reduces the total amount of the subsequent roadbed filling, reduces the construction influence on the outer side of the roadbed filling range, and is beneficial to accelerating the construction efficiency.

Inventors

• SHI CHAOYANG
• CHAI YUNTAO
• HAN WEIQIN
• LIU YONGCHANG
• XU WEIDONG
• ZHANG QIBAO
• WANG PEISI
• CHEN XIN
• YUAN PEILIANG
• WANG ZITONG
• ZHAO YANFANG

Assignees

• 中铁七局集团有限公司
• 中铁七局集团郑州工程有限公司

Dates

Publication Date

20260512

Application Date

20260225

Claims (9)

1. 1. A high fill subgrade system for rapid implementation in a confined space of a busy trunk, comprising: the guard piles are arranged along the periphery of the foundation pit for constructing the frame bridge so as to support the area corresponding to the pushing construction of the frame bridge; The supporting roadbed is positioned in the surrounding area of the guard piles and is close to the pushing path of the frame bridge, and steel supports are erected between the supporting roadbed and the guard piles to form an overhead area corresponding to the pushing path of the frame bridge; The steel sheet piles are positioned at two sides of the supporting roadbed, the two sides of the supporting roadbed are respectively provided with a beam corresponding to the steel sheet piles, and the two beams are connected through a prestressed rib; and the jacking mechanism is positioned between the guard piles and the corresponding steel sheet piles to provide supporting force for the steel sheet piles.
2. 2. The high-fill subgrade system for quickly implementing the narrow space of the busy trunk railway according to claim 1, wherein said jacking mechanism comprises a plurality of steel pipe columns which are distributed at intervals along the mileage direction of the supporting subgrade, one ends of said steel pipe columns are supported on the inner wall of said fender post through a steel pipe column base, and the other ends are supported on a cross beam on the outer side of said steel sheet pile; The steel pipe column base is double-spliced I-steel horizontally extending along the inner wall of the guard pile, a plurality of corresponding steel pipe column adjusting ends are arranged on the steel pipe column base, each adjusting end comprises an outer sleeve and an inner sleeve which are sleeved with each other, the outer sleeve is fixed at the end part of the steel pipe column, the inner sleeve is fixed on the steel pipe column base, and a pushing oil cylinder is arranged between the steel pipe column base and the end part of the steel pipe column.
3. 3. The high fill subgrade system for the rapid implementation of a confined space on a busy trunk railway as set forth in claim 2, wherein a U-shaped spacer is provided between said outer sleeve and said steel pipe column base.
4. 4. The high-fill subgrade system for quickly implementing a narrow space of a busy trunk railway according to claim 1, characterized in that side slopes are excavated at both sides of the supporting subgrade, side slope protection structures are piled up at the side slopes, and slopes are arranged at the outer sides of the side slope protection structures.
5. 5. The high-fill subgrade system for quickly implementing a narrow space of a busy trunk railway according to claim 4, wherein the two sides of the supporting subgrade are provided with steps positioned at the upper edges of the steel sheet piles, and the side slopes extend to the inner edges of the steps; The slope protection structure is correspondingly piled on the steps.
6. 6. The high-fill subgrade system for quickly implementing a narrow space of a busy trunk railway according to claim 1, wherein an anti-revetment is piled outside steel sheet piles corresponding to the foundation pit pushed by the frame bridge.
7. 7. A high-fill roadbed construction method for rapidly implementing a narrow space of a busy trunk railway is characterized by comprising the following steps: step S1, measuring square samples of a pushing construction area of a frame bridge, and driving guard piles along the periphery of the construction area; S2, excavating an area inside the guard piles to form a foundation pit, reserving a supporting roadbed in the excavation process, and pouring a frame bridge in the foundation pit; Step S3, steel sheet piles are arranged on two sides of the supporting roadbed, cross beams corresponding to the steel sheet piles are respectively arranged on two sides of the supporting roadbed, and the two cross beams are connected through prestressed tendons; a supporting mechanism is arranged between the guard piles and the corresponding steel sheet piles to provide supporting force for the steel sheet piles; S4, erecting a steel support between the support roadbed and the guard piles, after pouring of the frame bridge is completed and pushing jacks are arranged, excavating a pushing path of the frame bridge below the steel support, and then pushing the frame bridge; And S5, backfilling and grouting reinforcement are carried out on the area below the steel support after the frame bridge is pushed in place, and the steel support, the jacking mechanism and the steel sheet pile are gradually removed.
8. 8. The method for constructing a high-fill subgrade for rapidly implementing a narrow space on a busy trunk railway according to claim 7, characterized in that grouting reinforcement is performed on the corresponding area of the supporting subgrade.
9. 9. The method for constructing a high-fill subgrade in a narrow space of a busy trunk railway according to claim 7, characterized in that a plurality of displacement monitoring points are arranged on the steel sheet pile, and a jacking mechanism is controlled based on the displacement monitoring points so as to control displacement deformation of the steel sheet pile caused by sinking of the subgrade.

Description

High-fill roadbed system for rapidly implementing narrow space of busy trunk line and construction method Technical Field The invention belongs to the technical field of railway roadbed construction, and particularly relates to a high-fill roadbed system for rapidly implementing a busy trunk narrow space and a construction method. Background In the overhead jacking construction of the porous frame bridge of the busy trunk railway, an overhead supporting system is generally adopted to ensure safe passing of the train, but in the conversion process of the overhead jacking construction stress system of the busy trunk railway, a roadbed is filled in a short time in a narrow space, because the busy trunk railway of the railway is safely heavier than a Taishan mountain, the space is narrow, the roadbed filling difficulty is high, the filling quality requirement is high, a certain safety risk exists in the conventional overhead stress system, the roadbed is not used as a support, the safety is guaranteed, in addition, large hoisting equipment is needed when the I-steel is adopted for overhead, the requirements on the size of a site, the bearing capacity of a foundation and the position of equipment are high, the use requirements cannot be met when the narrow space is met, and the overhead stress system can cause shaking phenomenon of the train due to vibration after the frequent passing of the heavy-load train, so that the railway operation safety is endangered. Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides a high-fill roadbed system for rapidly implementing a narrow space of a busy trunk and a construction method. In order to achieve the above object, the present invention provides the following technical solutions: a high fill subgrade system for fast implementation in a confined space of a busy trunk, comprising: the guard piles are arranged along the periphery of the foundation pit for constructing the frame bridge so as to support the area corresponding to the pushing construction of the frame bridge; The supporting roadbed is positioned in the surrounding area of the guard piles and is close to the pushing path of the frame bridge, and steel supports are erected between the supporting roadbed and the guard piles to form an overhead area corresponding to the pushing path of the frame bridge; The steel sheet piles are positioned at two sides of the supporting roadbed, the two sides of the supporting roadbed are respectively provided with a beam corresponding to the steel sheet piles, and the two beams are connected through a prestressed rib; and the jacking mechanism is positioned between the guard piles and the corresponding steel sheet piles to provide supporting force for the steel sheet piles. Preferably, the jacking mechanism comprises a plurality of steel pipe columns which are distributed at intervals along the mileage direction of the supporting roadbed, one end of each steel pipe column is supported on the inner wall of the guard pile through a steel pipe column base, and the other end of each steel pipe column is supported on a cross beam on the outer side of the steel sheet pile; The steel pipe column base is double-spliced I-steel horizontally extending along the inner wall of the guard pile, a plurality of corresponding steel pipe column adjusting ends are arranged on the steel pipe column base, each adjusting end comprises an outer sleeve and an inner sleeve which are sleeved with each other, the outer sleeve is fixed at the end part of the steel pipe column, the inner sleeve is fixed on the steel pipe column base, and a pushing oil cylinder is arranged between the steel pipe column base and the end part of the steel pipe column. Preferably, a U-shaped cushion block is arranged between the outer sleeve and the steel pipe column base. Preferably, the side slopes are excavated at the two sides of the supporting roadbed, the side slope protection structure is piled at the side slope, and the slopes are arranged at the outer sides of the side slope protection structure. Preferably, steps positioned at the upper edges of the steel sheet piles are arranged on two sides of the supporting roadbed, and the side slopes extend to the inner edges of the steps; The slope protection structure is correspondingly piled on the steps. Preferably, the protection slope is piled outside the steel sheet piles corresponding to the foundation pit pushed by the frame bridge. A high-fill roadbed construction method for rapidly implementing a narrow space of a busy trunk railway comprises the following steps: step S1, measuring square samples of a pushing construction area of a frame bridge, and driving guard piles along the periphery of the construction area; S2, excavating an area inside the guard piles to form a foundation pit, reserving a supporting roadb