Isolation structure giving consideration to tunnel anti-floating and pipeline in-situ protection

Abstract

The utility model relates to the technical field of civil engineering, in particular to an isolation structure giving consideration to both floating resistance of a tunnel and in-situ protection of a pipeline, which comprises a portal frame structure consisting of pile foundations, a steel pipe cross beam and a concrete cross beam, and is characterized in that the pile foundations are arranged at the bottoms of working wells arranged on two sides of the tunnel and the pipeline; the steel pipe cross beam is arranged between the working wells on the two sides and transversely penetrates through the position between the tunnel and the pipeline, the concrete cross beam is arranged in the steel pipe cross beam, and the two ends of the concrete cross beam are fixedly connected with the pile foundations on the two sides to form an integral structure. The utility model has the advantages that the structure stress form is simple, clear and reliable; the structure mainly adopts a non-excavation process, so that the road damage and the influence on traffic can be avoided; the structure has a good upper and lower portion isolation effect, the influence on the upper portion is small during lower space construction, on the contrary, when a lower tunnel exists, safe construction can be conducted on the upper portion, and the problems that the lower existing tunnel swells or is insufficient in anti-floating performance and the like are not caused.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering technology, specifically to an isolation structure that takes into account both tunnel anti-buoyancy and in-situ protection of pipelines. It can be used to adjust the settlement of existing pipelines or building foundations, protect existing pipelines or building foundations from settlement, and also serve as an isolation structure between existing pipelines or building foundations and the project to be built below, thus protecting the safety of both the completed and planned projects. Background Technology

[0002] When shallow-buoyancy resistance is insufficient in the design and construction of urban tunnels, various methods can be used, such as topsoil ballast, adding counterweights within the tunnel, and anti-buoyancy pressure plates. However, each method has its own problems. For example, topsoil ballast can lead to ground subsidence; adding counterweights is often insufficient when space within the tunnel is limited; and the construction of anti-buoyancy pressure plates requires breaking up the road surface, causing traffic diversions or pipeline relocations. When numerous adverse factors are combined, and there are many pipelines or major pipelines that are difficult to relocate, the above solutions become inadequate. Conversely, when a shallow-buoyancy tunnel already exists below and excavation work is required above, the tunnel must be protected before starting the excavation work. Therefore, there is an urgent need to study an isolation structure and construction method that takes into account both tunnel anti-buoyancy and in-situ pipeline protection. Summary of the Invention

[0003] The purpose of this utility model is to address the shortcomings of the existing technology by providing an isolation structure that combines tunnel anti-buoyancy and in-situ pipeline protection. The main load-bearing components adopt trenchless technology to provide in-situ protection for shallow underground pipelines. At the same time, this structure can provide a portal frame-like protection for the lower tunnel, ensuring the safety of construction in the lower space. Furthermore, due to the strong rigidity of this structural system, it can isolate the upper and lower structures and can also be used for protection during excavation operations above existing tunnels.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] An isolation structure that combines tunnel anti-buoyancy and pipeline in-situ protection is characterized by comprising a portal frame structure consisting of pile foundations, steel pipe beams, and concrete beams. The pile foundations are located at the bottom of working shafts arranged on both sides of the tunnel and the pipeline. The steel pipe beams are located between the two working shafts and traverse the tunnel and the pipeline. The concrete beams are located inside the steel pipe beams, and both ends of the concrete beams are connected and fixed to the pile foundations on both sides to form an integral structure.

[0006] The steel bars of the concrete beam intersect and anchor with the steel bars of the pile foundation, and the connection between the two is completed by pouring concrete.

[0007] When the number or spacing of the concrete crossbeams does not match the number of piles, a longitudinal beam is provided on the top of the pile, and the reinforcing bars of the concrete crossbeams are anchored into the longitudinal beam.

[0008] The advantages of this utility model are:

[0009] 1) The structural stress form is simple, clear, and reliable.

[0010] 2) The structure mainly adopts trenchless technology, which can avoid road damage and the impact on traffic.

[0011] 3) The structure has a good isolation effect between the upper and lower parts. Construction in the lower space has little impact on the upper part. Conversely, if the lower tunnel already exists, construction can be carried out safely in the upper part without causing problems such as the bulging or insufficient buoyancy resistance of the existing lower tunnel.

[0012] 4) The main supporting components are constructed using small pipe jacking machines, which are convenient to construct, have minimal impact, and have high rigidity and strong load-bearing capacity.

[0013] 5) It has good reliability, good innovation and application value, and is worth promoting. Attached Figure Description

[0014] Figure 1 This is a plan view of the present invention;

[0015] Figure 2 This is a cross-sectional view of the steel pipe beam in this utility model;

[0016] Figure 3 This is a cross-sectional view of the combination of steel pipe beam and concrete beam in this utility model;

[0017] Figure 4 This is a construction flowchart of this utility model. Detailed Implementation

[0018] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:

[0019] like Figure 1-4 As shown in the figure, the numbers 1-8 represent: pipeline 1, working well 2, steel pipe beam 3, concrete beam 4, pile foundation 5, tunnel 6, concrete 7, and steel reinforcement 8, respectively.

[0020] Example 1: As Figures 1 to 3 As shown, the isolation structure that takes into account both tunnel anti-buoyancy and pipeline in-situ protection in this embodiment is applied when pipeline 1 is an existing structure and tunnel 6 needs to be built below pipeline 1 (especially suitable for tunnel 6 with shallow burial depth) and pipeline 1 needs to be protected in-situ.

[0021] Specifically, when this embodiment is applied, it includes the following steps:

[0022] 1) Based on the positional relationship between the existing pipeline 1 and the tunnel 6 to be built, and taking into account factors such as ground traffic, a reasonable location for the working shaft 2 is selected.

[0023] 2) Implement pile foundation 5 at the corresponding position of working well 2.

[0024] 3) Implement working shaft 2, the bottom elevation of which is located between pipeline 1 and tunnel 6.

[0025] 4) The steel pipe beam 3 is jacked into the working shaft 2. The steel pipe beam 3 mainly serves as an advance support and a guide hole for the construction of the concrete beam 4.

[0026] 5) The steel reinforcement cage for the concrete beam 4 is made and inserted into the steel pipe beam 3 using a segmented connection process. At the same time, the steel reinforcement of the concrete beam 4 and the steel reinforcement of the pile foundation 5 are cross-anchored. Concrete is poured (pressed) to complete the construction of the concrete beam 4.

[0027] In this embodiment, if the number or spacing of the concrete beams 4 and the pile foundations 5 do not match during actual use, a longitudinal beam can be installed on the top of the pile foundations 5, and the reinforcing bars of the concrete beams 4 can be anchored into the longitudinal beam to achieve effective connection.

[0028] 6) Backfill working well 2.

[0029] After the above steps are completed, the upper pipeline 1 and the stratum are under the in-situ protection of the portal frame structure composed of steel pipe beams 3, concrete beams 4 and pile foundations 5, which allows for safe construction of the lower tunnel. At the same time, for shallow overburden areas, this structure can also be used as a tunnel anti-buoyancy ballast, achieving multiple benefits.

[0030] Example 2: The difference between this example and Example 1 is that this example is for the case where the lower tunnel 6 is an existing structure (especially applicable to the case where the tunnel 6 is shallow) and it is necessary to excavate to implement the upper pipeline 1, which is the opposite of the case in Example 1.

[0031] 1) Based on the positional relationship between the existing tunnel 6 and the pipeline to be built 1, and taking into account factors such as ground traffic, a reasonable location for the working shaft 2 is selected.

[0032] 2) Implement pile foundation 5.

[0033] 3) Implement working well 2.

[0034] 4) The construction steel pipe beam 3 is jacked into the working well 2.

[0035] 5) The steel reinforcement cage for the concrete beam 4 is made and inserted into the steel pipe beam 3 using a segmented connection process. At the same time, the steel reinforcement of the concrete beam 4 and the steel reinforcement of the pile foundation 5 are cross-anchored. Concrete is poured (pressed) to complete the construction of the concrete beam 4.

[0036] 6) Backfill working well 2.

[0037] After the above steps are completed, the existing lower tunnel 6 is under the safe protection of the portal frame structure. When the upper soil is excavated and unloaded, there will be no insufficient anti-buoyancy or ground heave causing functional impairment. At the same time, when the ground needs to increase the backfill or load, this embodiment can also be used to provide safety protection for the lower tunnel.

[0038] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. An isolation structure for tunnel anti-floatation and in-situ protection of pipelines, characterized in that: The portal frame structure comprises pile foundation, steel pipe beam and concrete beam, wherein the pile foundation is arranged at the bottom of the working well arranged on both sides of the tunnel and pipeline, the steel pipe beam is arranged between the working wells on both sides and across the position between the tunnel and the pipeline, and the concrete beam is arranged inside the steel pipe beam, and the two ends of the concrete beam are respectively connected and fixed with the pile foundations on both sides to form an integral structure.

2. The isolation structure of claim 1, wherein: The steel bars of the concrete beam and the steel bars of the pile foundation are cross-anchored and poured with concrete to complete the connection therebetween.

3. The isolation structure of claim 1, wherein: When the number or spacing of the concrete beam and the pile foundation do not match, the top of the pile foundation is provided with a longitudinal beam, and the steel bars of the concrete beam are anchored into the longitudinal beam.

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