Operation high-speed rail platform roadbed settlement disease treatment method

Abstract

The invention relates to the technical field of rail traffic, in particular to an operation high-speed rail platform subgrade settlement disease treatment method, a steel pipe composite pile is constructed in a platform area of an existing subgrade, the pile bottom of the steel pipe composite pile is located on a bearing layer, and the steel pipe composite pile comprises an external cement soil mixing pile and a core pile arranged in the external cement soil mixing pile; the core pile is a steel pipe concrete core pile; reinforced concrete longitudinal beams are constructed on the tops of the steel pipe composite piles in a cast-in-place mode, and embedded bolts are reserved on the reinforced concrete longitudinal beams; the platform structure is constructed above the reinforced concrete longitudinal beams through the embedded bolts, the platform structure is supported on the reinforced concrete longitudinal beams in an overhead mode, and in other words, the force-bearing self-filling soil layer of the platform structure is converted to the steel pipe composite piles. The method has the advantages that the settlement problem of the platform is avoided, the structure is simple and reasonable, construction is convenient, the construction efficiency is high, and the method can be widely applied to treatment of settlement diseases of the high-speed rail platform.

Description

Technical Field

[0001] The present invention relates to the field of rail transportation technology, and in particular to a method for remediating subsidence damage of a high-speed railway platform. Background Art

[0002] With the large-scale construction and operation of high-speed railways, settlement of high-speed railway platform subgrades has occurred in many areas, particularly those in soft soil areas, causing inconvenience for passengers boarding and alighting. Although soft soil treatment is generally performed during the construction of high-speed railway platform subgrades in soft soil areas, the effectiveness of such treatments is limited.

[0003] At present, the settlement of the platform roadbed can only be dealt with by raising the platform after it settles to a certain extent. This solution cannot prevent the platform from continuing to settle. After a period of operation, the platform needs to be raised again. This is only a temporary solution and does not address the root cause. It not only affects the normal operation of the high-speed rail, but also increases costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for remediating the subgrade settlement of operating high-speed railway platforms based on the above-mentioned shortcomings of the existing technology. The method adopts a combination of steel pipe composite piles and base plates to form an overhead structure, and the platform surface is supported overhead on the steel pipe composite piles, thereby solving the problem of platform settlement.

[0005] The purpose of the present invention is achieved by the following technical solutions: A method for treating subsidence of a high-speed railway platform in operation, comprising an existing subgrade of the high-speed railway platform, wherein the existing subgrade comprises a fill layer, and below the fill layer there are a soft soil layer and a bearing layer in sequence, and the method is characterized by comprising the following steps: Constructing steel pipe composite piles in the platform area of the existing roadbed, wherein the pile bottom of the steel pipe composite pile is located above the bearing layer, and the steel pipe composite pile includes an outer cement-soil mixing pile and an inner core pile, wherein the core pile is a steel pipe concrete core pile; Casting reinforced concrete longitudinal beams on top of the steel pipe composite piles, wherein embedded bolts are reserved in the reinforced concrete longitudinal beams; The platform structure is constructed above the reinforced concrete longitudinal beams using the embedded bolts. The platform structure is supported overhead on the reinforced concrete longitudinal beams, that is, the load-bearing capacity of the platform structure is transferred from the fill layer to the steel pipe composite piles.

[0006] The platform structure includes prefabricated beams, prefabricated panels and decorative layers, wherein the prefabricated beams are connected to the embedded bolts, the prefabricated panels are laid on the prefabricated beams, and the decorative layer is laid on the prefabricated panels.

[0007] The prefabricated cross beam is a prefabricated steel component cross beam or a prefabricated reinforced concrete cross beam.

[0008] The prefabricated panels are steel component panels, aluminum alloy panels or prefabricated reinforced concrete panels.

[0009] The steel pipe composite piles are constructed in the area of the existing roadbed corresponding to the platform structure using construction equipment with a foldable mixing head, and the foldable mixing head is unfolded in the soft soil layer.

[0010] Two or more rows of the steel pipe composite piles are arranged at intervals along the transverse direction of the existing roadbed, and each row of the steel pipe composite piles includes a plurality of composite steel pipe piles arranged at intervals along the longitudinal direction of the existing roadbed.

[0011] A connecting steel cage is provided on the top of the steel tube concrete core pile, and the connecting steel cage is connected to the reinforced concrete longitudinal beam.

[0012] The bottom end of the steel pipe composite pile is located in the bearing layer below the existing roadbed.

[0013] The advantages of the present invention include: avoiding the settlement problem of the platform, simple and reasonable structure, convenient construction, high construction efficiency, and can be widely used in the remediation of settlement diseases of high-speed railway platforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of construction step I of the present invention; Figure 2 This is the overall layout diagram of construction step I of the present invention; Figure 3 This is a schematic diagram of the structure after the construction step I of the present invention is completed; Figure 4 This is a schematic diagram of the structure after the construction step II of the present invention is completed; Figure 5 for Figure 4 Plan view of the top of the middle pile; Figure 6 Schematic diagram of the pile top connection structure of the present invention; Figure 7 Layout diagram of steel pipe composite piles and reinforced concrete longitudinal beams in the present invention; Figure 8 This is a schematic diagram of the structure of the present invention after completion of construction; Figure 9 for Figure 8 Plan view of the top of the middle pile; Figure 10 This is the overall layout diagram after the construction of the present invention is completed. DETAILED DESCRIPTION

[0015] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: like Figure 1-10 As shown in the figure, 1-14 respectively represent: existing roadbed 1, roadbed opening 2, construction equipment 3, foldable mixing head 4, steel tube concrete core pile 5, cement soil mixing pile 6, steel tube composite pile 7, reinforced concrete longitudinal beam 8, connecting steel cage 9, embedded bolts 10, prefabricated cross beam 11, prefabricated panel 12, decorative layer 13, and overhead platform 14.

[0016] Example: Figures 1 to 10 As shown, the method for remediating subgrade settlement damage in an operating high-speed railway platform in this embodiment is used to address settlement in an existing subgrade 1. Through structural design, a combined structure consisting of steel pipe composite piles and a cap plate is erected on the existing subgrade 1. The existing subgrade 1 includes a fill layer and a soft soil layer beneath the fill layer. Below the soft soil layer is a bearing layer; the platform structure bears the load above the fill layer. Within the area of the existing subgrade 1, a rigid pile raft reinforcement zone is provided below the rail area, and mixed pile reinforcement zones are provided on either side of the rigid pile raft reinforcement zone.

[0017] Specifically, combined Figures 1 to 10 , when applied, the structure includes the following construction methods: 1) Combination Figures 1 to 3 As shown, construction equipment 3 is used to construct steel pipe composite piles 7 on an existing roadbed 1. This existing equipment features a foldable mixing head 4. In the platform area, a "small hole, large pile" method is employed, with steel pipes being inserted through the fill layer of the existing roadbed 1. Once the steel pipes reach the soft soil layer, the foldable mixing head 4 is deployed to mix and form composite piles in the soft soil. Connecting rods are used to mix and sink the steel pipes section by section.

[0018] During construction, if the fill layer of the existing roadbed 1 contains stone materials such as rocks and concrete blocks, a drill can be used to drill holes first to avoid damage to the construction equipment 3 due to the presence of these stone materials. If mixing is difficult in the existing pile area, the steel pipe can be passed through the existing reinforcement pile area and then the foldable mixing head 4 can be opened to mix.

[0019] After the steel tube is mixed to the bearing layer, concrete is poured into the steel tube, forming a composite pile type consisting of a steel tube concrete core pile 5 surrounded by a cement-soil mixing pile 6. In this embodiment, the steel tube composite pile 7 is divided into two sections along the height direction. One section consists of the steel tube concrete core pile 5 and the cement-soil mixing pile 6, located in the soft soil layer below the existing roadbed 1. The steel tube concrete core pile 5 in this section is installed inside the cement-soil mixing pile 6; the other section consists of the steel tube concrete core pile 5 located in the fill layer of the existing roadbed 1.

[0020] 2) Combination Figure 4 and Figure 5As shown, the above steps are repeated to set up two rows of steel pipe composite piles 7 in the platform area. The two rows of steel pipe composite piles 7 are arranged at intervals along the transverse direction of the existing roadbed 1; the steel pipe composite piles 7 in the same row are evenly spaced along the longitudinal direction of the existing roadbed 1.

[0021] 3) Combination Figure 6 and Figure 7 As shown, when pouring concrete into the steel tube of each steel tube composite pile 7, a connecting steel cage 9 is inserted into the steel tube, and the upper portion of the connecting steel cage 9 is connected to the reinforced concrete longitudinal beam 8. The reinforced concrete longitudinal beam 8 is then cast in situ at the top of each steel tube composite pile 7. During the cast-in-situ construction of the reinforced concrete longitudinal beam 8, embedded bolts 10 are pre-embedded at the top of the reinforced concrete longitudinal beam 8 for connecting to the upper structure.

[0022] 4) Combination Figure 8 and Figure 9 As shown, when the high-speed railway platform is out of use at night, the prefabricated crossbeams 11 are quickly connected to the reinforced concrete longitudinal beams 8 through embedded bolts 10, and prefabricated panels 12 are laid on the prefabricated crossbeams 11, and the decorative layer 13 of the platform (marble, various sign pavings, etc.) is laid on the prefabricated panels 12.

[0023] In this embodiment, the prefabricated cross beam 11 is a prefabricated steel member cross beam or a prefabricated reinforced concrete cross beam, and the prefabricated panel 12 is a steel member panel, an aluminum alloy panel or a prefabricated reinforced concrete panel.

[0024] 5) After the construction is completed, if Figure 10 As shown, the platform structure forms an elevated platform 14, supported by steel pipe composite piles 7. This allows the platform 14, serving as the platform structure, to bear the load on the steel pipe composite piles 7, while the existing roadbed 1 fill layer beneath the elevated platform 14 is unloaded. The bottoms of the steel pipe composite piles 7 rest on the bearing layer and do not settle along with the existing roadbed 1 of the high-speed railway platform. Consequently, the elevated platform 14 supported by the steel pipe composite piles 7 will not settle either, thus fundamentally resolving the settlement problem of high-speed railway platforms located on soft soil.

[0025] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, so they are not described in detail here.

Claims

1. A method for remediating subsidence damage at an operating high-speed railway platform, comprising an existing roadbed at the high-speed railway platform, wherein the existing roadbed comprises a fill layer, a soft soil layer and a bearing layer below the fill layer, and is characterized by: The steps include: Constructing steel pipe composite piles in the platform area of the existing roadbed, wherein the pile bottom of the steel pipe composite pile is located above the bearing layer, and the steel pipe composite pile includes an outer cement-soil mixing pile and an inner core pile, wherein the core pile is a steel pipe concrete core pile; Casting reinforced concrete longitudinal beams on top of the steel pipe composite piles, wherein embedded bolts are reserved in the reinforced concrete longitudinal beams; The platform structure is constructed above the reinforced concrete longitudinal beams using the embedded bolts. The platform structure is supported overhead on the reinforced concrete longitudinal beams, that is, the load-bearing capacity of the platform structure is transferred from the fill layer to the steel pipe composite piles.

2. The method for treating subgrade settlement damage of an operating high-speed railway platform according to claim 1, characterized in that: The platform structure includes prefabricated beams, prefabricated panels and decorative layers, wherein the prefabricated beams are connected to the embedded bolts, the prefabricated panels are laid on the prefabricated beams, and the decorative layer is laid on the prefabricated panels.

3. The method for treating subgrade settlement of an operating high-speed railway platform according to claim 2, characterized in that: The prefabricated cross beam is a prefabricated steel component cross beam or a prefabricated reinforced concrete cross beam.

4. The method for treating subgrade settlement of an operating high-speed railway platform according to claim 2, characterized in that: The prefabricated panels are steel component panels, aluminum alloy panels or prefabricated reinforced concrete panels.

5. The method for treating subgrade settlement damage of an operating high-speed railway platform according to claim 1, characterized in that: The steel pipe composite piles are constructed in the area of the existing roadbed corresponding to the platform structure using construction equipment with a foldable mixing head, and the foldable mixing head is unfolded in the soft soil layer.

6. The method for treating subgrade settlement damage of an operating high-speed railway platform according to claim 1, characterized in that: Two or more rows of the steel pipe composite piles are arranged at intervals along the transverse direction of the existing roadbed, and each row of the steel pipe composite piles includes a plurality of composite steel pipe piles arranged at intervals along the longitudinal direction of the existing roadbed.

7. The method for treating subgrade settlement damage of an operating high-speed railway platform according to claim 1, characterized in that: A connecting steel cage is provided on the top of the steel tube concrete core pile, and the connecting steel cage is connected to the reinforced concrete longitudinal beam.

8. The method for treating subgrade settlement damage of an operating high-speed railway platform according to claim 1, characterized in that: The bottom end of the steel pipe composite pile is located in the bearing layer below the existing roadbed.

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