Non-destructive variable cross-section pile support based on pit bottom deeply-buried pipeline and construction method

Abstract

The invention discloses a non-destructive variable-cross-section pile support based on a pit bottom deeply-buried pipeline and a construction method. The non-destructive variable-cross-section pile support comprises a plurality of variable-cross-section piles. The section size of the part, located above the bottom of the foundation pit, of each variable-section pile is larger than that of the part, located below the bottom of the foundation pit, of each variable-section pile, so that gaps between the parts, located below the bottom of the foundation pit, of all the variable-section piles can meet the requirement for penetrating of existing underground pipelines in the corresponding positions. During construction, all the variable cross-section piles are designed firstly; accurately positioning the existing underground pipeline; and finally, hole forming construction is conducted, and all the variable-cross-section piles are constructed. According to the invention, the pipeline does not need to be changed and moved during support construction, and the construction safety and the integrity of the pipeline are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and particularly to a non-destructive variable cross-section pile support and construction method based on deeply buried pipelines at the bottom of the pit. Background Technique

[0002] With the acceleration of the urbanization process, the density of underground pipelines has been increasing continuously, bringing significant challenges to construction and maintenance work.

[0003] Existing support systems often cause damage to the surrounding environment and pipelines during construction, and even require the relocation of pipelines. Especially for deeply buried pipelines at the bottom of the foundation pit, with a large burial depth, a large amount of manpower and material resources are required when using traditional relocation schemes, increasing construction costs and risks. In the fields of modern civil engineering and underground engineering, foundation pit construction has become an important part of urban infrastructure construction. However, with the acceleration of the urbanization process, the density of underground pipelines has increased significantly, bringing many challenges to foundation pit construction. Especially for deeply buried pipelines at the bottom of the foundation pit, if damaged during construction, it may lead to pipeline leakage and shutdown, and then cause serious impacts on surrounding buildings and the environment.

[0004] Traditional support measures usually adopt methods such as suspension protection or temporary relocation for shallow pipelines. However, for deeply buried pipelines at the bottom of the foundation pit, since the foundation pit cannot be excavated to the bottom of the pipeline during construction, simple relocation measures not only increase the project implementation cost but also may not effectively protect the pipeline. In addition, due to the crisscrossing of pipelines under the road, a single pipeline relocation may trigger a chain reaction of other pipelines, and problems such as the implementation of new pipelines and the layout of pipeline wells may also arise. This process is complex and time-consuming, involving a large amount of manpower and material resources, significantly increasing project costs and engineering risks.

[0005] Research shows that the deficiencies of existing support systems during construction have attracted wide attention in the industry, and existing support technologies usually have difficulty taking into account both pipeline protection and construction safety. When adopting a treatment method to avoid pipelines, there may be too large a gap between piles during foundation pit construction, resulting in a relatively large calculated result of foundation pit deformation. In addition, the water and soil pressure within the excavation range of the foundation pit is usually large, while the passive earth pressure at the bottom of the foundation pit helps to balance the water and soil pressure at the corresponding depth. Therefore, there is an urgent need to study a variable cross-section pile support scheme to effectively address the challenges brought by deeply buried pipelines at the bottom of the foundation pit. This scheme can not only protect deeply buried pipelines but also reduce the impact of construction on the environment and improve construction efficiency to adapt to the increasingly complex underground environment.

[0006] Therefore, how to ensure construction safety and the integrity of pipelines without relocating pipelines during support construction has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0007] In view of the above-mentioned defects of the prior art, the present invention provides a non-destructive variable cross-section pile support and construction method based on buried pipelines at the bottom of a pit, and the purpose achieved is to solve the limitations of traditional support technologies in complex underground environments, especially the problem of protecting buried pipelines. Specifically, in view of the phenomenon that urban underground pipelines are becoming increasingly dense and traditional support methods during construction may cause damage to the surrounding environment and pipelines, it is possible to construct the support without relocating the pipelines, ensuring construction safety and the integrity of the pipelines.

[0008] To achieve the above purpose, the present invention discloses a non-destructive variable cross-section pile support based on buried pipelines at the bottom of a pit, including a number of variable cross-section piles;

[0009] The cross-sectional dimensions of all the variable cross-section piles above the bottom of the foundation pit are larger than those below the bottom of the foundation pit, so that the gaps between the parts of all the variable cross-section piles below the bottom of the foundation pit can meet the requirements for the passage of existing underground pipelines at corresponding positions.

[0010] Preferably, between the bottom of the foundation pit and the existing underground pipelines, at positions close to the parts of each variable cross-section pile below the bottom of the foundation pit, micro-injection MJS reinforcement measures or filling injection reinforcement measures are adopted to enhance the soil at corresponding positions to form a reinforcement structure;

[0011] The reinforcement structure and the support form an integral whole.

[0012] The present invention also provides a construction method for the non-destructive variable cross-section pile support based on buried pipelines at the bottom of a pit, which is characterized by including the following steps:

[0013] Step 1, design of all the variable cross-section piles;

[0014] Step 2, accurately locate the existing underground pipelines;

[0015] Step 3, perform hole-forming construction and construct all the variable cross-section piles.

[0016] Preferably, in Step 2, before construction operations, detailed detection and positioning of the existing underground pipelines are carried out, and accurate pipeline maps are made to ensure the accuracy and integrity of all buried pipeline information.

[0017] Preferably, in Step 3, conventional hole-forming methods are used when drilling bored piles in the upper part of the foundation pit; in the area adjacent to the existing underground pipelines, when the drilling depth is 2 meters ± 10%, a casing is added for hole-forming;

[0018] When performing the hole-forming, the rotary drilling pile technology is selected;

[0019] The casing is gradually removed after the construction is completed.

[0020] More preferably, during the construction process, a real-time monitoring system including foundation pit deformation monitoring and pipeline stress monitoring is established; after completion, the stress states of all the variable cross-section piles and the integrity of the existing underground pipelines are evaluated to ensure the effectiveness and safety of the support system.

[0021] Establishing a real-time monitoring system including foundation pit deformation monitoring and pipeline stress monitoring can ensure timely discovery and solution of potential problems.

[0022] After completion, evaluating the stress states of all the variable cross-section piles and the integrity of the existing underground pipelines can ensure the effectiveness and safety of the support system.

[0023] Advantages of the present invention:

[0024] The present invention can achieve the construction of the support without relocating the pipelines, ensuring construction safety and the integrity of the pipelines.

[0025] The present invention has good adaptability and exhibits excellent stability and economy under complex underground conditions, providing an effective solution for the sustainable development of underground engineering.

[0026] The present invention provides a feasible strategy for foundation pit construction and opens up a new direction for the sustainable development of underground engineering.

[0027] The following will further illustrate the concept, specific structure and technical effects of the present invention with reference to the accompanying drawings to fully understand the purpose, features and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic plan view showing an embodiment of the present invention.

[0029] Figure 2 Showing the present invention Figure 1 A schematic cross-sectional view taken along line AA in the present invention.

[0030] Figure 3 Showing the present invention Figure 1 A schematic cross-sectional view taken along line BB in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Embodiment

[0032] As Figures 1 to 3 shown, the non-destructive variable cross-section pile support based on buried pipelines at the bottom of the pit includes a number of variable cross-section piles;

[0033] The cross-sectional dimensions of all variable cross-section piles above the foundation pit bottom in part 1 are larger than those of the part below the foundation pit bottom in part 2, so that the gaps between all variable cross-section piles in part 2 below the foundation pit bottom can meet the requirements for the passage of existing underground pipelines 4 at the corresponding positions.

[0034] The present invention uses variable cross-section piles to form a support. The cross-sectional dimensions of all variable cross-section piles above the foundation pit bottom in part 1 are larger than those of the part below the foundation pit bottom in part 2, so that the gaps between all variable cross-section piles in part 2 below the foundation pit bottom can meet the requirements for the passage of underground pipelines 4 at the corresponding positions. This not only improves the bearing capacity and stability of the variable cross-section piles, can bear the large soil and water pressure above the foundation pit bottom, effectively resist the soil and water pressure and other external loads generated during the foundation pit construction, but also can avoid the influence on the existing underground pipelines 4 through the gaps between the variable cross-section piles in part 2 below the foundation pit bottom.

[0035] The cross-sectional dimensions of all variable cross-section piles above the foundation pit bottom in the present invention are larger than those of the part below the foundation pit bottom in part 2, which can also overcome the problem that local construction cannot be carried out due to the influence of pipelines below the foundation pit bottom, and avoid the interference of construction on the existing underground pipelines 4.

[0036] In some embodiments, between the foundation pit bottom and the existing underground pipelines 4, at positions close to the part 2 of each variable cross-section pile below the foundation pit bottom, micro-injection MJS reinforcement measures or filling injection reinforcement measures are adopted to strengthen the soil at the corresponding positions to form a reinforcement structure 3;

[0037] The reinforcement structure 3 forms an integral body with the support.

[0038] In practical applications, since the small cross-section piles at the bottom of the foundation pit cannot be closely attached to the foundation pit excavation surface and are difficult to effectively resist the action of the soil, micro-injection MJS reinforcement measures or filling injection reinforcement measures and other reinforcement measures with less influence on the pipelines are adopted at the critical positions to strengthen the soil at the corresponding positions to form a reinforcement structure 3, so that the reinforced reinforcement structure 3 forms an integral body with the support and effectively resists the soil and water pressure in the pit bottom area.

[0039] The present invention also provides a construction method for non-destructive variable cross-section pile support based on buried pipelines at the bottom of the pit, which is characterized by including the following steps:

[0040] Step 1, the design of all variable cross-section piles;

[0041] Step 2, accurately locate the existing underground pipelines 4;

[0042] Step 3, carry out hole-forming construction and construct all variable cross-section piles.

[0043] In some embodiments, in step 2, before the construction operation, a detailed detection and positioning of the existing underground pipelines 4 are carried out, and an accurate pipeline map is made to ensure the accuracy and integrity of all deep-buried pipeline information.

[0044] In some embodiments, in step 3, conventional hole-forming methods are used for the bored piles in the upper part of the foundation pit; in the area adjacent to the existing underground pipelines 4, when the drilling depth is 2 meters ± 10%, a casing is added for hole-forming;

[0045] When carrying out hole-forming, the rotary drilling pile technology is selected;

[0046] The casing is gradually removed after the construction is completed.

[0047] In practical applications, when carrying out hole-forming, the selection of the rotary drilling pile technology can ensure that the existing underground pipelines 4 will not be significantly squeezed or vibrated during the construction process.

[0048] In some embodiments, during the construction process, a real-time monitoring system including foundation pit deformation monitoring and pipeline stress monitoring is established; after completion, the stress states of all variable-section piles and the integrity of the existing underground pipelines 4 are evaluated. To ensure the effectiveness and safety of the support system.

[0049] Establishing a real-time monitoring system including foundation pit deformation monitoring and pipeline stress monitoring can ensure the timely discovery and solution of potential problems.

[0050] After completion, evaluating the stress states of all variable-section piles and the integrity of the existing underground pipelines 4 can ensure the effectiveness and safety of the support system.

[0051] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning, or limited experiments should be within the protection scope determined by the claims.

Claims

1. Non-destructive variable cross-section pile support based on buried pipelines at the bottom of the pit; characterized in that, It includes several variable cross-section piles; The cross-sectional dimensions of the upper part (1) of all the variable cross-section piles above the foundation pit bottom are larger than those of the lower part (2) below the foundation pit bottom, so that the gaps between the lower parts (2) of all the variable cross-section piles below the foundation pit bottom can meet the passing of the existing underground pipelines (4) at the corresponding positions.

2. The non-destructive variable cross-section pile support based on deeply buried pipelines at the bottom of the pit according to claim 1, wherein Between the foundation pit bottom and the existing underground pipelines (4), at the positions close to the lower parts (2) of each variable cross-section pile below the foundation pit bottom, micro-injection MJS reinforcement measures or filling grouting reinforcement measures are adopted to enhance the soil mass at the corresponding positions to form a reinforcement structure (3); The reinforcement structure (3) and the support form an integral whole.

3. The construction method of non-destructive variable cross-section pile support based on buried pipelines at the bottom of a pit according to claim 1 or 2, characterized in that, It includes the following steps: Step 1, the design of all the variable cross-section piles; Step 2, the precise positioning of the existing underground pipelines (4); Step 3, hole-forming construction and the construction of all the variable cross-section piles.

4. The construction method of non-destructive variable cross-section pile support based on buried pipelines at the bottom of the pit according to claim 3, characterized in that, In Step 2, before the construction operation, detailed detection and positioning of the existing underground pipelines (4) are carried out, and a precise pipeline map is made to ensure the accuracy and integrity of all the buried pipeline information.

5. The construction method of non-destructive variable cross-section pile support based on deeply buried pipelines at the bottom of a pit according to claim 3, characterized in that, In Step 3, conventional hole-forming methods are used when drilling the bored piles in the upper part of the foundation pit; in the area close to the existing underground pipelines (4), when the drilling depth is 2 meters ± 10%, a casing is added for hole-forming; When carrying out the hole-forming, the rotary drilling pile technology is selected; The casing is gradually removed after the construction is completed.

6. The construction method of non-destructive variable cross-section pile support based on buried pipelines at the bottom of a pit according to claim 5, characterized in that, During the construction process, a real-time monitoring system including foundation pit deformation monitoring and pipeline stress monitoring is established; after completion, the stress states of all the variable cross-section piles and the integrity of the existing underground pipelines (4) are evaluated. To ensure the effectiveness and safety of the support system. Establishing a real-time monitoring system including foundation pit deformation monitoring and pipeline stress monitoring can ensure the timely discovery and solution of potential problems. After completion, evaluating the stress states of all the variable cross-section piles and the integrity of the existing underground pipelines (4) can ensure the effectiveness and safety of the support system.

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