Safety construction system for foundation pit close to deeply-buried pressure pipeline
By constructing a combined structure of static pressure steel pipes and Larsen steel sheet piles around the foundation pit and high-pressure rotary spray grouting technology, the problem of protection of deep buried pressure pipelines during foundation pit excavation is solved, and a safe and efficient construction effect is achieved.
Patent Information
- Application Number
- CN202422764383.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-11-13
AI Technical Summary
The existing technology is difficult to effectively protect the near-deep buried pressure pipeline during foundation pit excavation, and there are problems such as complex construction coordination, long cycle, difficult protection and difficult precise positioning. Traditional measures cannot effectively reduce the impact of foundation pit excavation on the pipeline, resulting in high safety risks.
The combination of static pressure steel pipe short piles/Lasen steel plate short piles, static pressure steel pipe long piles/Lasen steel plate long piles and protective line external support long piles is adopted, and combined with all-round high-pressure rotary spray grouting technology, shallow reinforcement zones and side deep reinforcement zones are built to form safety protection holes and water stop curtains to ensure the safety of pipelines during foundation pit excavation.
It effectively reduces the impact of foundation pit excavation on deep buried pressure pipelines, improves construction safety and efficiency, ensures the stability and integrity of the pipelines, and reduces construction risks.
Smart Images
Figure CN223074750U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of underground engineering construction safety, in particular to a foundation pit safety construction system for a deep-buried pressure pipeline in the vicinity. Background Technique
[0002] With the acceleration of the urbanization process, the number of infrastructure construction projects is increasing day by day, and foundation pit excavation has become a common construction method. However, when the construction project is located above a deep-buried pressure pipeline in the vicinity, a series of technical challenges are faced during the construction process. The particularly prominent problems include:
[0003] (1) Difficulty in coordination and relocation: The relocation of deep-buried pressure pipelines usually involves the coordination and approval of multiple departments, and the process is cumbersome. Relevant regulations and standards have strict requirements for the protection and relocation of pressure pipelines, resulting in an extended construction period and affecting the progress of the entire project.
[0004] (2) Long cycle: Since the work of relocating adjacent pressure pipelines involves complex technical solutions and construction plans, it may require a long design, approval, and construction cycle. This process not only increases the construction cost but also puts pressure on the overall time arrangement of the project.
[0005] (3) Difficulty in protection during construction: During the construction period, how to effectively protect deep-buried pressure pipelines from interference is a severe challenge. Soil disturbance, ground settlement, and the impact of construction machinery may all pose threats to the pipelines, and traditional protection measures are often insufficient to cope with unexpected situations.
[0006] (4) Difficulty in accurately determining the construction position of some pipe jacking operations: During pipe jacking construction, the relationship between the exact operation position and the deep-buried pressure pipeline may be difficult to accurately determine due to on-site variables. An incorrect construction position will not only lead to construction failure but may also cause safety accidents.
[0007] In the prior art, foundation pit construction often faces construction safety hazards caused by deep-buried pressure pipelines. Traditional foundation pit support designs mostly adopt a single pile foundation or a combination of piles and plates, or the pipeline needs to be located far enough away, resulting in an excessive pile spacing and an overly large deformation of the local enclosure structure, which instead fails to play a protective role. Therefore, the traditional construction plan does not fully consider the impact of adjacent deep-buried pipelines, often leading to possible offsets, deformations, or even ruptures under the amplification effect of the pipelines, posing risks to construction safety. In addition, most of the prior art lacks targeted measures and fails to effectively reduce the lateral pressure and vibration generated on the pressure pipeline during foundation pit excavation, resulting in insufficient protection measures.
[0008] For the reinforcement of foundation pits, although some technologies have been applied, such as jet grouting piles, three-axis mixing piles for slurry spraying reinforcement, internal bracing of anchor rods, etc., these solutions often have additional impacts on pipelines and it is difficult to ensure the safety and stability of pipelines. At the same time, for the water-stop measures, simple waterproof curtains are generally adopted. In the case of large water and soil pressure, such measures cannot effectively prevent water source penetration and soil displacement, and are prone to causing the imbalance of water and soil pressure in the foundation pit, resulting in damage to surrounding facilities.
[0009] In summary, in the face of the complex environment where foundation pit excavation coexists with deeply buried pressure pipelines, the existing technologies generally lack systematic technical solutions and practical application demonstrations, and fail to effectively solve the safety and management problems during the construction process. Therefore, there is an urgent need to develop a comprehensive foundation pit safety construction system to clarify the coordinated application of support design, reinforcement measures and waterproof curtains, so as to improve the construction efficiency and safety, and ensure the stability and integrity of deeply buried pressure pipelines.
[0010] In view of the above problems, there is an urgent need for a foundation pit safety construction system based on the foundation pit above the adjacent deeply buried pressure pipeline. Through comprehensive monitoring and management means, the construction process is optimized to ensure the efficient and safe implementation of foundation pit construction operations without affecting the safety of pressure pipelines. Summary of the Utility Model
[0011] In view of the above-mentioned defects of the prior art, the present utility model provides a foundation pit safety construction system for the foundation pit above the adjacent deeply buried pressure pipeline, and the purpose is to effectively solve a series of construction safety management and protection technical problems caused by the existence of the deeply buried pressure pipeline during the foundation pit excavation process, improve the construction efficiency, reduce the safety risks, and promote the sustainable development of urban infrastructure construction.
[0012] To achieve the above purpose, the present utility model discloses a foundation pit safety construction system for the foundation pit above the adjacent deeply buried pressure pipeline, including a foundation pit located above the deeply buried pressure pipeline. The part of the foundation pit directly above the deeply buried pressure pipeline is a shallow reinforcement area adopting a shallow reinforcement protection system, and the parts on both sides of the deeply buried pressure pipeline and the shallow reinforcement protection system are deep reinforcement areas adopting a side deep reinforcement protection system;
[0013] The shallow reinforcement protection system includes a number of static pressure steel pipe short piles / Larssen steel sheet short piles arranged on the outer side of the corresponding side wall of the foundation pit and above the deeply buried pressure pipeline;
[0014] The ground projection of each static pressure steel pipe short pile / Larssen steel sheet short pile is within the range of 1 meter to 2 meters on both sides of the ground projection of the deeply buried pressure pipeline;
[0015] The distance between the lower end of each static pressure steel pipe short pile / Larssen steel sheet short pile and the deeply buried pressure pipeline is more than one meter;
[0016] Each of the deep reinforcement protection systems on the side includes static pressure steel pipe long piles / Larssen steel sheet long piles arranged on the outer side of the corresponding side wall of the foundation pit and support long piles outside the protection line.
[0017] Each of the static pressure steel pipe long piles / Larssen steel sheet long piles is arranged on the outer side of the corresponding side wall of the foundation pit and is adjacent to the first or the last static pressure steel pipe short pile / Larssen steel sheet short pile on the corresponding side of the shallow reinforcement protection system.
[0018] Along the direction of each static pressure steel pipe long pile / Larssen steel sheet long pile away from the corresponding static pressure steel pipe short pile / Larssen steel sheet short pile, multiple support long piles outside the protection line are arranged along the corresponding side wall of the foundation pit.
[0019] Preferably, the bottoms of the shallow reinforcement area and the deep reinforcement area are both reinforced by the all-round high-pressure jet grouting technology MJS to form a safety protection hole spanning directly above the deeply buried pressure pipeline.
[0020] Preferably, on the outer side of any side wall of the foundation pit, on the side of the retaining structure formed by arranging the static pressure steel pipe short piles / Larssen steel sheet short piles, the static pressure steel pipe long piles / Larssen steel sheet long piles and the support long piles outside the protection line in a row, which is away from the foundation pit, an MJS water-stop curtain is constructed by using the all-round high-pressure jet grouting technology.
[0021] More preferably, one inclined water-stop curtain pile is provided at each end of each MJS water-stop curtain.
[0022] The two inclined water-stop curtain piles of each MJS water-stop curtain cross below the deeply buried pressure pipeline and are both located outside the protection line of the deeply buried pressure pipeline.
[0023] More preferably, the two inclined water-stop curtain piles of each MJS water-stop curtain are connected to the water-stop curtain outside the protection line.
[0024] Preferably, an overlapping water-stop curtain is formed between each static pressure steel pipe short pile / Larssen steel sheet short pile and the adjacent static pressure steel pipe long pile / Larssen steel sheet long pile by using the MJS technology.
[0025] Preferably, a static pressure water-stop Larssen steel sheet short pile is provided between every two adjacent static pressure steel pipe short piles / Larssen steel sheet short piles.
[0026] Preferably, a static pressure water-stop Larssen steel sheet long pile is provided between each static pressure steel pipe short pile / Larssen steel sheet short pile and the adjacent static pressure steel pipe long pile / Larssen steel sheet long pile.
[0027] The beneficial effects of the utility model:
[0028] The utility model aims to solve a series of technical challenges in urban infrastructure construction, such as the complexity of construction coordination, the extension of construction period, the increase in pipeline protection difficulty, and the difficulty of precise construction positioning caused by the existence of deeply buried pressure pipelines. By comprehensively applying monitoring technologies, management methods, and protection measures.
[0029] The utility model provides an efficient and safe foundation pit construction solution to ensure the smooth progress of foundation pit excavation construction activities without affecting the safety of deeply buried pressure pipelines, and promote the healthy development of urban infrastructure.
[0030] The following will further illustrate the concept, specific structure, and technical effects of the utility model in conjunction with the drawings to fully understand the purpose, features, and effects of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 The structure schematic diagram in the top view direction showing an embodiment of the utility model.
[0032] Figure 2 Showing the utility model Figure 1 The sectional structure schematic diagram in the AA direction in the utility model.
[0033] Figure 3 Showing the utility model Figure 1 The sectional structure schematic diagram in the BB direction in the utility model.
[0034] Figure 4 Showing the utility model Figure 1 The sectional structure schematic diagram in the CC direction in the utility model.
[0035] Figure 5 Showing the utility model Figure 1 The sectional structure schematic diagram in the DD direction in the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0036] As Figures 1 to 5 shown, a specific embodiment of the foundation pit safety construction system for the utility model adjacent to a deeply buried pressure pipeline includes a foundation pit above the deeply buried pressure pipeline 11. The part of the foundation pit directly above the deeply buried pressure pipeline 11 is a shallow reinforcement area with a shallow reinforcement protection system 7, and the parts on both sides of the deeply buried pressure pipeline 11 and the shallow reinforcement protection system 7 are deep reinforcement areas with a side deep reinforcement protection system 6;
[0037] The shallow reinforcement protection system 7 includes a number of static pressure steel pipe short piles / Larssen steel sheet short piles 1 arranged on the outer side of the corresponding side walls of the foundation pit and above the deeply buried pressure pipeline 11;
[0038] The ground projection of each static pressure steel pipe short pile / Larssen steel sheet short pile 1 is within the range of 1 meter to 2 meters on both sides of the ground projection of the deeply buried pressure pipeline 11;
[0039] The distance between the lower end of each short static pressure steel pipe pile / Larssen steel sheet pile 1 and the deeply buried pressure pipeline 11 is more than one meter.
[0040] Each side deep reinforcement protection system 6 includes long static pressure steel pipe piles / Larssen steel sheet piles 5 arranged on the outer side of the corresponding side wall of the foundation pit and long retaining piles 2 outside the protection line.
[0041] Each long static pressure steel pipe pile / Larssen steel sheet pile 5 is arranged on the outer side of the corresponding side wall of the foundation pit and is adjacent to the first or last short static pressure steel pipe pile / Larssen steel sheet pile 1 on the corresponding side of the shallow reinforcement protection system 7.
[0042] In the direction away from the corresponding short static pressure steel pipe pile / Larssen steel sheet pile 1 of each long static pressure steel pipe pile / Larssen steel sheet pile 5, a plurality of long retaining piles 2 outside the protection line are arranged along the corresponding side wall of the foundation pit.
[0043] The utility model relates to the safety management and protection technology during the foundation pit excavation process, especially the safety construction system related to adjacent deeply buried pressure pipelines such as medium and high-pressure gas pipelines and aviation oil pipelines. It adopts the high-low static pressure PC composite method pile structure of short static pressure steel pipe piles / Larssen steel sheet piles 1, long static pressure steel pipe piles / Larssen steel sheet piles 5 and long retaining piles 2 outside the protection line as the support scheme to minimize the impact of the foundation pit on the deeply buried pressure pipeline 11.
[0044] Within a range of 1 meter on each side of the deeply buried pressure pipeline 11, in practice, it can be reasonably determined according to the specific requirements of the pressure pipeline management department. The pile lengths of the short static pressure steel pipe piles / Larssen steel sheet piles 1 and the long static pressure steel pipe piles / Larssen steel sheet piles 5 should be appropriately shortened to ensure that the clear distance between the deeply buried pressure pipeline 11 and the internal structure of the enclosure remains more than 1 meter, and it is reasonably determined according to the specific requirements of the pressure pipeline management department in practice.
[0045] The utility model, through the combined structure of short static pressure steel pipe piles / Larssen steel sheet piles 1 and long static pressure steel pipe piles / Larssen steel sheet piles 5, after a safe distance from the deeply buried pressure pipeline 11, adopts long static pressure steel pipe piles / Larssen steel sheet piles 5 to enhance the overall anti-overturning ability of the support structure. This design scheme effectively reduces the lateral pressure borne by the pipeline and can effectively cope with potential deformation risks.
[0046] In the utility model, in order to reduce the impact of the foundation pit excavation on the deeply buried pressure pipeline 11, in addition to setting a necessary safety clearance above the pipeline for foundation reinforcement, side deep reinforcement protection systems 6 need to be added on both sides of the pipeline to form an effective protection barrier.
[0047] In some embodiments, the bottom of the shallow reinforcement area and the bottom of the deep reinforcement area are both reinforced by the all-round high-pressure jet grouting technology MJS to form a safety protection hole spanning above the deeply buried pressure pipeline 11.
[0048] During construction, a method with less impact on the deeply buried pressure pipeline 11 should be adopted, such as the all-round high-pressure jet grouting technology (MJS), to construct a safety protection tunnel and form an effective protection barrier for the pipeline. The existence of this barrier can significantly reduce the vibration and soil displacement during the foundation pit excavation, thereby protecting the integrity and safety of the deeply buried pressure pipeline 11.
[0049] In some embodiments, on the side of the foundation pit away from the foundation pit of the retaining structure formed by arranging the static pressure steel pipe short piles / Larssen steel sheet short piles 1, the static pressure steel pipe long piles / Larssen steel sheet long piles 5 and the external support long piles 2 outside any side wall of the foundation pit in a row, an MJS water-stop curtain 3 is constructed by using the all-round high-pressure jet grouting technology.
[0050] In some embodiments, an inclined water-stop curtain pile 8 is provided at both ends of each MJS water-stop curtain 3;
[0051] The two inclined water-stop curtain piles 8 of each MJS water-stop curtain 3 cross below the deeply buried pressure pipeline 11 and are both located outside the protection line of the deeply buried pressure pipeline 11.
[0052] In some embodiments, the two inclined water-stop curtain piles 8 of each MJS water-stop curtain 3 are connected to the water-stop curtain 4 outside the protection line.
[0053] In some embodiments, an overlapping water-stop curtain is formed between each static pressure steel pipe short pile / Larssen steel sheet short pile 1 and the adjacent static pressure steel pipe long pile / Larssen steel sheet long pile 5 by using the MJS technology.
[0054] At the junction between each static pressure steel pipe short pile / Larssen steel sheet short pile 1 and the adjacent static pressure steel pipe long pile / Larssen steel sheet long pile 5, an overlapping water-stop curtain should be formed by using the MJS technology, especially in the pipeline crossing area.
[0055] The above water-stop system can effectively prevent the seepage of water and soil pressure through the junction between the foundation pit edge and the deeply buried pressure pipeline 11. At the same time, the retaining wall system formed by the self-weight of the reinforced body can resist the water and soil pressure at the pipeline crossing position, further enhancing the stability of the foundation pit.
[0056] Through the above measures, the construction safety can be effectively guaranteed during the foundation pit construction near the deeply buried pressure pipeline, the influence on the surrounding pipelines can be reduced, and the smooth progress of the project can be ensured.
[0057] In some embodiments, a static pressure water-stop Larssen steel sheet short pile 9 is provided between every two adjacent static pressure steel pipe short piles / Larssen steel sheet short piles 1.
[0058] In some embodiments, a static-pressure water-stop Larssen steel sheet long pile 10 is provided between each static-pressure steel pipe short pile / Larssen steel sheet short pile 1 and the adjacent static-pressure steel pipe long pile / Larssen steel sheet long pile 5.
[0059] The construction method of the present utility model includes the following steps:
[0060] Step 1, construction preparation, specifically, comprehensively carry out construction preparation work, including organizing personnel training, preparing construction equipment and materials, and completing relevant safety and technical disclosures;
[0061] Step 2, adopt a combination of geophysical exploration and precise exploration to conduct a comprehensive investigation of the deeply buried pressure pipeline 11, ensuring that the actual dimensional error of the plane and elevation of the deeply buried pressure pipeline 11 is controlled within 100 mm to ensure the accuracy of subsequent construction;
[0062] Step 3, based on the data shown by geophysical exploration and precise exploration, accurately mark the position of the deeply buried pressure pipeline 11 on the plane and longitudinal section of the retaining structure to ensure the consistency between the construction drawings and the on-site conditions;
[0063] Step 4, use the static-pressure method to construct the static-pressure steel pipe short pile / Larssen steel sheet short pile 1, static-pressure steel pipe long pile / Larssen steel sheet long pile 5, static-pressure water-stop Larssen steel sheet short pile 9, and static-pressure water-stop Larssen steel sheet long pile 10 to effectively reduce the impact of construction on the pipeline and protect the safety and integrity of the pipeline;
[0064] Step 5, construct the MJS water-stop curtain 3 using the MJS method, and in combination with the design requirements for the external release of the deeply buried pressure pipeline 11, make the two inclined water-stop curtain piles 8 form an oblique intersection structure;
[0065] Step 6, for the foundation pit bottom reinforcement system, use the MJS method to reinforce the shallow reinforcement area above the pipeline and the side deep reinforcement protection system 6 to enhance the stability of the foundation pit and ensure the protection of the pipeline during the excavation process;
[0066] Step 7, construct the external protection line support long pile 2 and the external protection line water-stop curtain 4 outside the foundation pit, and set up the support according to the design requirements to improve the stability and safety of the overall structure;
[0067] Step 8, carry out the excavation operation of the deep foundation pit soil body. All excavation work must be carried out strictly in accordance with the design specifications and safety standards to ensure construction safety and efficiency.
[0068] In some embodiments, in Step 5, the oblique intersection overlapping part of the two inclined water-stop curtain piles 8 of each MJS water-stop curtain 3 needs to ensure meeting the water-stop requirements, the effective overlapping length is not less than 300 mm, and it is ensured that the MJS water-stop curtain 3 intersects with the corresponding two inclined water-stop curtain piles 8 to construct a complete and effective water-stop curtain system.
[0069] The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present utility model without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field based on the concept of the present utility model through logical analysis, reasoning, or limited experiments on the basis of the prior art shall fall within the protection scope determined by the claims.
Claims
1. A foundation pit safety construction system for an adjacent deep-buried pressure pipeline, including a foundation pit located above the deep-buried pressure pipeline (11); characterized in that, The part of the foundation pit directly above the deep-buried pressure pipeline (11) is a shallow reinforcement area with a shallow reinforcement protection system (7), and the parts on both sides of the deep-buried pressure pipeline (11) and the shallow reinforcement protection system (7) are deep reinforcement areas with a side deep reinforcement protection system (6); The shallow reinforcement protection system (7) includes several static pressure steel pipe short piles / Larssen steel sheet short piles (1) arranged outside the corresponding side walls of the foundation pit and above the deep-buried pressure pipeline (11); The ground projection of each static pressure steel pipe short pile / Larssen steel sheet short pile (1) is within the range of 1 to 2 meters on both sides of the ground projection of the deep-buried pressure pipeline (11); The distance between the lower end of each static pressure steel pipe short pile / Larssen steel sheet short pile (1) and the deep-buried pressure pipeline (11) is more than one meter; Each side deep reinforcement protection system (6) includes a static pressure steel pipe long pile / Larssen steel sheet long pile (5) and an external protection line support long pile (2) arranged outside the corresponding side walls of the foundation pit; Each static pressure steel pipe long pile / Larssen steel sheet long pile (5) is arranged outside the corresponding side wall of the foundation pit and is adjacent to the first or last static pressure steel pipe short pile / Larssen steel sheet short pile (1) on the corresponding side of the shallow reinforcement protection system (7); On the side of each static pressure steel pipe long pile / Larssen steel sheet long pile (5) facing away from the corresponding static pressure steel pipe short pile / Larssen steel sheet short pile (1), a plurality of external protection line support long piles (2) are arranged along the corresponding side wall of the foundation pit.
2. The foundation pit safety construction system for adjacent deep-buried pressure pipelines according to claim 1, wherein The bottom of the shallow reinforcement area and the bottom of the deep reinforcement area are both reinforced by the all-round high-pressure jet grouting technology MJS to form a safety protection hole spanning directly above the deep-buried pressure pipeline (11).
3. The foundation pit safety construction system for adjacent deep-buried pressure pipelines according to claim 1, wherein On the side of any side wall of the foundation pit, on the side of the retaining structure formed by arranging the static pressure steel pipe short piles / Larssen steel sheet short piles (1), the static pressure steel pipe long piles / Larssen steel sheet long piles (5) and the external protection line support long piles (2) in a row facing away from the foundation pit, an MJS water-stop curtain (3) is constructed by using the all-round high-pressure jet grouting technology.
4. The foundation pit safety construction system for adjacent deep-buried pressure pipelines according to claim 3, characterized in that, One inclined water-stop curtain pile (8) is provided at each end of each MJS water-stop curtain (3); The two inclined water-stop curtain piles (8) of each MJS water-stop curtain (3) cross below the deep-buried pressure pipeline (11) and are both outside the protection line of the deep-buried pressure pipeline (11).
5. The foundation pit safety construction system for adjacent deep-buried pressure pipelines according to claim 4, wherein The two inclined water-stop curtain piles (8) of each MJS water-stop curtain (3) are connected to the external protection line water-stop curtain (4).
6. The foundation pit safety construction system for adjacent deep-buried pressure pipelines according to claim 1, wherein An overlapping water-stop curtain is formed between each static pressure steel pipe short pile / Larssen steel sheet short pile (1) and the adjacent static pressure steel pipe long pile / Larssen steel sheet long pile (5) by using the MJS technology.
7. The foundation pit safety construction system for adjacent deep-buried pressure pipelines according to claim 1, wherein, A static pressure water-stop Larssen steel sheet short pile (9) is provided between every two adjacent static pressure steel pipe short piles / Larssen steel sheet short piles (1).
8. The foundation pit safety construction system for the adjacent deep-buried pressure pipeline according to claim 1, characterized in that, A static pressure water-stop Larssen steel sheet long pile (10) is provided between each static pressure steel pipe short pile / Larssen steel sheet short pile (1) and the adjacent static pressure steel pipe long pile / Larssen steel sheet long pile (5).