Construction method of deep foundation pit structure close to pressure pipeline and deep foundation pit structure

Abstract

The invention discloses a construction method of a deep foundation pit close to a pressure pipeline and a deep foundation pit structure, and the construction method comprises the steps that a pressure pipeline monitoring point is arranged, and the pressure pipeline monitoring point is used for monitoring the displacement change of the pipeline in real time; the pressure pipeline outer protection structure is constructed and used for reducing sedimentation or horizontal displacement of the pressure pipeline (1); constructing an external envelope structure of the deep foundation pit so as to avoid or reduce displacement of a soil body outside the deep foundation pit; and a deep foundation pit inner support is arranged so as to provide supporting force for the soil body outside the deep foundation pit in the excavation process of the deep foundation pit, and the soil body outside the deep foundation pit is prevented from moving. According to the construction method of the deep foundation pit structure close to the pressure pipeline, the displacement condition of the pressure pipeline can be monitored at any time in the deep foundation pit construction process, the soil body around the pressure pipeline is prevented from displacing by arranging the deep foundation pit outer protection structure and the deep foundation pit inner support, and the soil body around the pressure pipeline is prevented from being displaced by the pressure pipeline outer protection structure. And displacement of the pressure pipeline is avoided or reduced.

Description

Technical Field

[0001] The present application relates to the field of deep foundation pit construction near pressure pipelines, and more specifically, to a construction method and a deep foundation pit structure for a deep foundation pit structure near a pressure pipeline. Background Art

[0002] In scenarios such as high-rise building construction, underground commercial facilities (such as underground shopping malls, parking lots), subway or underground traffic system construction, underground pipeline network laying (such as water supply, power, and drainage pipelines), and urban infrastructure renovation. Due to the limited urban space, a large amount of underground development is often required, and deep foundation pit excavation has become a common means in urban construction.

[0003] High-pressure gas pipelines are one of the important pressure pipelines in modern cities, and they have extremely high requirements for safety. The current specifications and pipeline ownership units usually require that the deformation of high-pressure gas pipelines be controlled within 10 mm. At present, for high-pressure gas pipelines near deep foundation pits, the gas pipelines are usually relocated or the distance between the deep foundation pit side line and the gas pipeline is enlarged; for situations where the gas pipeline cannot be relocated or sufficient safety distance cannot be reserved, there is no corresponding construction method.

[0004] Therefore, how to provide a construction method for a deep foundation pit near a pressure pipeline has become a technical problem to be solved in this field. Summary of the Invention

[0005] In view of this, the present application proposes a construction method and a deep foundation pit structure for a deep foundation pit structure near a pressure pipeline.

[0006] According to the first aspect of the present application, a construction method for a deep foundation pit near a pressure pipeline is proposed. The construction method includes: setting pressure pipeline monitoring points for real-time monitoring of the displacement change of the pressure pipeline; constructing an outer protection structure for the pressure pipeline to reduce the settlement or horizontal displacement of the pressure pipeline; constructing a peripheral protection structure for the deep foundation pit to avoid or reduce the displacement of the soil outside the deep foundation pit; and setting internal supports for the deep foundation pit to provide a supporting force for the soil outside the deep foundation pit during the excavation process of the deep foundation pit to prevent the soil outside the deep foundation pit from moving.

[0007] Preferably, the setting of the pressure pipeline monitoring points includes: arranging a hoop on the outside of the pressure pipeline, and the hoop is tightly attached to the outer surface of the pressure pipeline.

[0008] Preferably, a monitoring rod is arranged on the top surface of the hoop, and the monitoring rod is arranged vertically.

[0009] Preferably, the construction of the outer protection structure for the pressure pipeline includes: obliquely arranging grouting pipes on both sides in the radial direction of the pressure pipeline for real-time grouting compensation adjustment when the pressure pipeline generates displacement.

[0010] Preferably, the horizontal distance between the grouting pipe and the pressure pipeline is 1 m - 3 m, and the vertical distance is 2 m - 3 m.

[0011] Preferably, the number of the grouting pipes is multiple, and the distance between the grouting pipes on the same side of the pressure pipeline is 1 m - 2 m.

[0012] Preferably, the peripheral retaining structure of the constructed deep foundation pit includes: a constructed vertical retaining structure, the vertical retaining structure includes isolation piles and a support structure, and the isolation piles are arranged between the support structure and the pressure pipeline.

[0013] Preferably, the peripheral retaining structure of the constructed deep foundation pit further includes: a constructed horizontal retaining structure, the horizontal retaining structure includes: a first top beam, the first top beam is arranged at the top of the isolation piles; a second top beam, the second top beam is arranged at the top of the support structure; a connecting beam, the connecting beam is used to connect the first top beam and the second top beam.

[0014] Preferably, the internal support of the deep foundation pit is set inside the excavated deep foundation pit, and a concrete support and a steel support are sequentially arranged from top to bottom.

[0015] According to another aspect of the present application, a deep foundation pit structure adjacent to a pressure pipeline is proposed, and the deep foundation pit structure is made by the construction method of the deep foundation pit adjacent to the pressure pipeline as described above.

[0016] The construction method of the deep foundation pit structure adjacent to the pressure pipeline proposed by the present application can monitor the displacement of the pressure pipeline at any time during the construction of the deep foundation pit. By setting the peripheral retaining structure of the deep foundation pit and the internal support of the deep foundation pit, the displacement of the soil around the pressure pipeline is prevented, and the displacement of the pressure pipeline is avoided or reduced through the external protection structure of the pressure pipeline.

[0017] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present application, and the schematic embodiments and descriptions thereof are used to explain the present application. In the drawings: Figure 1 It is a schematic cross-sectional view of the construction of the deep foundation pit structure according to the preferred embodiment of the present application.

[0019] Figure 2 It is a schematic cross-sectional view of the construction of the pressure pipeline monitoring points in the deep foundation pit structure according to the preferred embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0021] According to the first aspect of the present application, a construction method for a deep foundation pit adjacent to a pressure pipeline is proposed. The construction method includes: setting pressure pipeline monitoring points for real-time monitoring of the displacement change of the pressure pipeline 1; constructing an outer protective structure for the pressure pipeline to reduce the settlement or horizontal displacement of the pressure pipeline 1; constructing a perimeter retaining structure for the deep foundation pit to avoid or reduce the displacement of the soil outside the deep foundation pit; and setting internal supports for the deep foundation pit to provide a supporting force for the soil outside the deep foundation pit during the excavation of the deep foundation pit and prevent the soil outside the deep foundation pit from moving.

[0022] The above-mentioned pressure pipeline 1 refers to a pipeline with a maximum working pressure greater than or equal to 0.1 MPa (gauge pressure) for gaseous, liquefied gaseous, steam media, or flammable, explosive, toxic, corrosive liquid media with a maximum working temperature higher than or equal to the standard boiling point, and a nominal diameter greater than 25 mm. In this application, a high-pressure gas pipeline is taken as an example.

[0023] The above-mentioned outer protective structure for the pressure pipeline is to carry out protection along the extending direction of the pressure pipeline 1 on both sides and the bottom of the pressure pipeline 1 within the construction area of the deep foundation pit, so as to avoid the risk of damage, deformation, or rupture of the pressure pipeline 1 caused by the horizontal displacement or settlement of the soil around the pressure pipeline 1 during the excavation of the adjacent deep foundation pit.

[0024] In order to further ensure that during the excavation of the deep foundation pit, the movement of the soil outside the deep foundation pit into the deep foundation pit is reduced, resulting in the settlement or displacement of the soil around the pressure pipeline 1, before the construction of the deep foundation pit, the perimeter retaining structure of the deep foundation pit is constructed first. The above-mentioned perimeter retaining structure of the deep foundation pit is arranged between the deep foundation pit and the pressure pipeline 1. The perimeter retaining structure can withstand the lateral pressure of the soil around the foundation pit, avoid the settlement or horizontal displacement of the foundation pit edge, on the one hand, it can ensure the safety during the construction inside the deep foundation pit; on the other hand, it can ensure the stability of the soil outside the deep foundation pit, thereby reducing the impact on the pressure pipeline 1 outside the deep foundation pit during the construction inside the deep foundation pit.

[0025] The above-mentioned pressure pipeline monitoring points are used to facilitate personnel on the ground to observe the horizontal displacement or settlement of the pressure pipeline 1 in a timely manner during the construction of the deep foundation pit, so as to stop the construction or construct the outer protective structure of the pressure pipeline 1 in a timely manner.

[0026] In this application, before the excavation of the deep foundation pit, it is necessary to set pressure pipeline monitoring points first, and then construct the perimeter retaining structure of the deep foundation pit. During the excavation of the deep foundation pit, observe the changes of the pressure pipeline monitoring points at all times, and adjust the construction speed of the deep foundation pit and construct the outer protective structure of the pressure pipeline 1 at the bottom or side of the pressure pipeline 1 in a timely manner.

[0027] The construction method of the deep foundation pit adjacent to the pressure pipeline proposed in this application can effectively ensure the safety of the pressure pipeline and the surrounding pressure pipelines. The external protection structure protects the pipeline from soil deformation and external force damage. The monitoring points of the pressure pipeline track the displacement changes of the pressure pipeline in real time, and adjust the construction strategy in a timely manner. The peripheral protection structure supports the soil around the foundation pit to prevent collapse or settlement, ensuring stability and safety during the construction process, optimizing the construction progress, and reducing the impact on the surrounding environment.

[0028] In order to accurately obtain the horizontal displacement or settlement of the pressure pipeline 1 during the construction of the deep foundation pit, preferably, the setting of the pressure pipeline monitoring points may include: installing a hoop 2 on the outside of the pressure pipeline 1, and the hoop 2 is tightly attached to the outer surface of the pressure pipeline 1. The above-mentioned pressure pipeline monitoring points are set at the positions where the deformation curvature of the pressure pipeline 1 is large and sensitive to deformation, such as the nodes, turning points, and slope change points of the pressure pipeline 1; the size of the above-mentioned hoop 2 is customized according to the size of the pressure pipeline 1, and the inner diameter of the above-mentioned hoop 2 is the same as the outer diameter of the pressure pipeline 1. In order to tightly connect the hoop 2 with the pressure pipeline 1 to move synchronously with the pressure pipeline 1, the above-mentioned hoop 2 includes a first hoop and a second hoop. The two ends of the first hoop and the second hoop can be connected by screw threads, or one end of the first hoop and the second hoop is connected by screw threads, and the other end is connected by a hinge. This application is not limited to the above methods, as long as the hoop 2 can be stably fixed on the outer surface of the pressure pipeline 1.

[0029] The thickness of the above-mentioned hoop 2 is generally 6-8 mm, and the width is 20 mm-30 mm.

[0030] In order to facilitate personnel to observe the displacement of the pressure pipeline 1 on the ground, a monitoring rod 3 is arranged on the top surface of the above-mentioned hoop 2. The monitoring rod 3 is vertically arranged. The monitoring rod 3 and the above-mentioned hoop 2 can be connected in an appropriate manner, such as fixed connection, and preferably detachable connection in this application. The detachable connection method can be screw thread connection. In order to accurately judge the displacement of the pressure pipeline 1 during the construction of the deep foundation pit. In order to ensure that the monitoring rod 3 remains vertical, it is necessary to adjust the hoop 2 to make the monitoring rod 3 vertical. The above-mentioned monitoring rod 3 can be made of an appropriate material, such as one of stainless steel, aluminum alloy, glass fiber reinforced plastic, carbon fiber reinforced plastic, and steel bars, and preferably steel bars. Steel bars have good strength and mechanical properties, good adaptability, and low cost.

[0031] After the monitoring rod 3 is installed and before the deep foundation pit is excavated, to prevent the monitoring rod 3 from moving, which may lead to inaccurate judgment of the displacement of the pressure pipeline 1 during the excavation of the deep foundation pit, a sleeve 12 can be provided outside the monitoring rod 3. The sleeve 12 is arranged vertically, and its top is flush with or slightly lower than the ground. The inside and outside of the sleeve are filled with fine sand, and the height of the fine sand is lower than that of the monitoring rod 3. The fine sand can provide better stability and fixing effect. Secondly, the pressure inside and outside the sleeve 12 can be transmitted more evenly, reducing the possibility of deformation or movement of the monitoring rod 3. When the pressure pipeline 1 at the bottom undergoes displacement or settlement, the monitoring rod 3 also undergoes displacement or settlement accordingly, making the monitoring of the pressure pipeline 1 more accurate. To ensure the safety of the construction site, a monitoring point cover 14 is also provided on the top of the sleeve 12, which is opened when the displacement of the pressure pipeline needs to be observed and closed when it is not needed.

[0032] According to a preferred embodiment of the present application, to avoid or reduce the displacement or settlement of the pressure pipeline 1 after the deep foundation pit is excavated, the external protection structure of the pressure pipeline may include: grouting pipes 4 are obliquely arranged on both sides in the radial direction of the pressure pipeline 1 for real-time grouting compensation adjustment when the pressure pipeline 1 undergoes displacement; the horizontal distance between the grouting pipe 4 and the pressure pipeline 1 is 1m - 3m, preferably 1.5m, and the vertical distance is 2m - 3m. The above grouting pipe 4 can quickly inject slurry for adjustment when the pressure pipeline undergoes displacement, preventing the pressure pipeline from having excessive displacement due to uneven settlement or external force, thus ensuring the stability of the pipeline; enhancing the stability of the soil layer around the pressure pipeline 1 and reducing the influence of soil deformation on the pipeline. By adopting the oblique layout method, the grouting can be evenly diffused to the required area, flexibly coping with the displacement problem and improving the safety of the project. The above grouting pipe 4 can be made of appropriate materials, such as steel pipes, polyethylene pipes, stainless steel pipes, and is preferably a sleeve valve pipe in this application. Using a sleeve valve pipe can accurately control the grouting volume and grouting position, so that the grouting liquid can be accurately injected into the position that needs to be reinforced or compensated; it can be adjusted in real time to avoid the risks brought by pipeline settlement or displacement. In addition, the sleeve valve pipe has high maintainability, is easy to replace the valve core, reduces the maintenance cost, is suitable for complex underground environments, and ensures long-term and effective grouting reinforcement.

[0033] To enhance the compensation adjustment effect of the grouting pipe 4 when the pressure pipeline 1 undergoes displacement, preferably, the number of the grouting pipes 4 can be multiple, and the spacing between the grouting pipes 4 on the same side of the pressure pipeline 1 is 1m - 2m, preferably 1.5m, so that the grouting pipes 4 are evenly distributed on both sides of the pressure pipeline 1, and grouting can be carried out at multiple positions of the pressure pipeline 1. Different grouting volumes can also be provided according to different settlements or horizontal displacements at different positions to improve the grouting compensation effect, thereby being able to more effectively control the soil reinforcement and stability when the pressure pipeline 1 undergoes displacement and ensuring uniform reinforcement of the soil layer around the pipeline.

[0034] According to a preferred embodiment of the present application, the peripheral retaining structure of the construction deep foundation pit may include: a construction vertical retaining structure, and the vertical retaining structure may include isolation piles 5 and a support structure 6. The height of the support structure 6 is generally the depth of the foundation pit plus the embedded length that meets the requirements of anti-overturning and anti-heave stability through design calculation. When the soil below the pit bottom is soft soil, the embedded depth should also meet the requirements of circular arc sliding stability. The isolation piles 5 may be arranged between the support structure 6 and the pressure pipeline 1. The above-mentioned support structure 6 is constructed after the isolation pile 5 structure is completed. The distance between the isolation pile 5 and the pressure pipeline 1 is not less than 1-1.5 times the buried depth of the pressure pipeline 1, so that the isolation pile 5 penetrates through the soft soil layer to reach the stable soil layer to ensure the stability of the isolation pile 5. When constructing the isolation pile 5, measures such as ground hardening and full casing following can be adopted to reduce the impact of pile formation on the pressure pipeline 1. The isolation pile 5 and the support structure 6 form two lines of defense, which helps to strengthen the stability of the foundation pit slope, can effectively isolate the external force impact that may be caused to the pressure pipeline 1 during the construction of the deep foundation pit, and reduce the vibration, displacement or other possible damages to the pipeline during the construction process. The isolation pile 5, as an independent retaining structure, can prevent the influence of soil displacement or settlement on the pressure pipeline 1 and the surrounding environment.

[0035] To enhance the stability of the peripheral retaining structure, preferably, the peripheral retaining structure of the construction deep foundation pit may further include: a construction horizontal retaining structure, and the horizontal retaining structure may include: a first capping beam 7, which is arranged on the top of the isolation pile 5; a second capping beam 8, which is arranged on the top of the support structure 6; and a connecting beam 9, which is used to connect the first capping beam 7 and the second capping beam 8. The above-mentioned first capping beam 7, second capping beam 8 and connecting beam 9 are all made of reinforced concrete to provide strong support force. The above-mentioned first capping beam 7 and second capping beam 8 form an effective horizontal support system, enhancing the stability of the entire retaining structure. Through the connecting beam 9, the load can be evenly distributed in the retaining structure, reducing the structural damage that may be caused by local load concentration, improving the bearing capacity of the peripheral retaining structure of the deep foundation pit, ensuring the stability of the soil around the foundation pit, especially during the excavation process, effectively avoiding soil collapse or displacement, and providing stronger support force. The horizontal retaining structure can effectively reduce the impact on the surrounding environment and prevent ground settlement or unstable conditions. It reduces the risks brought about by the excavation of the foundation pit.

[0036] To ensure that the peripheral retaining structure does not displace after the excavation of the deep foundation pit, preferably, the installation of the internal support for the deep foundation pit can be to install a concrete support 10 and a steel support 11 from top to bottom inside the excavated deep foundation pit. The support spacing is calculated and determined according to the geological conditions and design requirements in accordance with relevant specifications. The above-mentioned concrete support 10 is installed before the excavation of the deep foundation pit and serves as the first support to provide preliminary support, reducing the disturbance to the soil during construction and avoiding the instability or sudden collapse of the soil during the excavation of the foundation pit. One end of the above-mentioned concrete support 10 is connected to the second capping beam 8, which can limit the displacement and deformation of the side wall of the deep foundation pit and ensure that the soil during the excavation process does not undergo excessive displacement. The above-mentioned steel support 11 is installed below the concrete support 10. The steel support 11 has high flexibility, light weight, and is easy to install and disassemble, and can be quickly adjusted according to actual needs. The steel support 11 has strong bearing capacity and is suitable for situations where large lateral pressure is borne during the excavation of deep foundation pits, and can effectively control soil deformation. As the excavation depth of the foundation pit increases, it can provide continuous strong support. To facilitate the installation of the steel support 11, a steel or concrete waling beam 13 is provided on the side of the retaining structure 6 close to the inside of the deep foundation pit. The above-mentioned concrete waling beam is connected to the retaining structure by planting steel bars, and the steel waling beam is connected to the retaining structure through supports and tie bars.

[0037] According to another aspect of the present application, a deep foundation pit structure adjacent to a pressure pipeline is proposed, and this deep foundation pit structure is made by the construction method of the deep foundation pit adjacent to the pressure pipeline described above.

[0038] The construction method of the deep foundation pit adjacent to the pressure pipeline proposed in the present application is as follows: Taking the high-pressure gas pipeline as an example.

[0039] (1) Construct the monitoring points for the pressure pipeline. Excavate the high-pressure gas pipeline according to the layout position of the monitoring points, and set a hoop 2 outside the high-pressure gas pipeline, leaving only a tiny gap between the two. Make a steel bar monitoring rod, and connect the steel bar monitoring rod and the hoop 2 with nuts. By tightening the bolts on the hoop 2, the hoop 2 and the high-pressure gas pipeline are pressed tightly. Appropriately adjust the hoop 2 to keep the steel bar monitoring rod vertical. Place the sleeve, and backfill with fine sand inside and outside the sleeve.

[0040] (2) Construct the isolation piles 5; Drive the isolation piles 5 on the natural ground. The isolation piles 5 are 600 - 1000 mm cast-in-place piles. During construction, to reduce the influence of the drilling rig construction, lay steel plates at the position of the drilling rig.

[0041] (3) Construction of the external protection structure for the pressure pipeline; Diagonal sleeve valves are driven alternately at a position 1.5 m on both sides of the high-pressure gas pipeline, with a spacing of 1.5 m, extending 2 - 3 m below the pipeline. Water-cement ratio of the cement slurry: 0.6 - 0.7; Baumé degree of water glass: 35 - 42, modulus 2.85 - 3.2, ratio of cement slurry to water glass: 1:0.5 - 1:1; Initial setting time of the double-fluid slurry: about 1 min; Single grouting volume: not more than 160 L; Grouting flow rate: about 20 L / min; Grouting pressure: generally controlled at 0.3 Mpa, and can be adjusted appropriately according to the on-site conditions.

[0042] (4) Construction of the support structure 6; The foundation pit support structure 6 is constructed from the ground, and the specific form depends on the engineering conditions. During the construction period, the steel bar monitoring rods are monitored, and according to the monitoring results, measures such as follow-up grouting are taken in a timely manner to compensate for the pipeline settlement.

[0043] (5) Construction of the horizontal retaining structure; Reinforced concrete capping beams (the first capping beam 7 and the second capping beam 8) are constructed, and the first capping beam 7 and the second capping beam 8 are connected by a connecting beam 9.

[0044] (6) Construction of the internal support for the deep foundation pit. The first concrete support 10 is constructed before the excavation of the deep foundation pit. The soil in the foundation pit is excavated, and the steel waist beam and steel support 11 are constructed step by step. During the excavation process, the deformation of the pipeline is monitored in real time. When the monitored value of the pipeline deformation is greater than 80% of the control value (deformation 10 mm), measures such as sleeve valve grouting and adjusting the preloading force through the steel support jacks are taken to control the pipeline deformation within the required range.

[0045] The preferred embodiments of the present application have been described in detail above. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all fall within the protection scope of the present application.

[0046] Additionally, it should be noted that in the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present application does not separately describe various possible combination methods.

[0047] In addition, any combination can be made between different embodiments of the present application, as long as it does not violate the idea of the present application, it should also be regarded as the content disclosed by the present invention.

Claims

1. A construction method for a deep foundation pit adjacent to a pressure pipeline, characterized in that: The construction method comprises: setting a pressure pipeline monitoring point, the pressure pipeline monitoring point being used to monitor the displacement change of the pressure pipeline (1) in real time; Constructing an external protective structure for the pressure pipeline to reduce the settlement or horizontal displacement of the pressure pipeline (1); Construct the outer protective structure of the deep foundation pit to avoid or reduce the displacement of the soil outside the deep foundation pit; Set up supports inside the deep foundation pit to provide support for the soil outside the deep foundation pit during the excavation of the deep foundation pit and prevent the soil outside the deep foundation pit from moving.

2. The construction method of a deep foundation pit adjacent to a pressure pipeline according to claim 1, characterized in that: The pressure pipeline monitoring point setting includes: A clamp (2) is arranged on the outside of the pressure pipe (1), and the clamp (2) is arranged in close contact with the outer surface of the pressure pipe (1).

3. The construction method of a deep foundation pit adjacent to a pressure pipeline according to claim 2, characterized in that: A monitoring rod (3) is arranged on the top surface of the clamp (2), and the monitoring rod (3) is arranged vertically.

4. The construction method of a deep foundation pit adjacent to a pressure pipeline according to claim 1, characterized in that: The construction pressure pipeline external protection structure comprises: grouting pipes (4) are obliquely arranged on both sides of the pressure pipeline (1) in the radial direction, and are used to perform real-time grouting compensation adjustment when the pressure pipeline (1) is displaced.

5. The construction method of a deep foundation pit adjacent to a pressure pipeline according to claim 4, characterized in that: The horizontal distance between the grouting pipe (4) and the pressure pipe (1) is 1m-3m, and the vertical distance is 2m-3m.

6. The construction method of a deep foundation pit adjacent to a pressure pipeline according to claim 5, characterized in that: The number of the grouting pipes (4) is multiple, and the spacing between the grouting pipes (4) on the same side of the pressure pipeline (1) is 1m-2m.

7. The construction method of a deep foundation pit adjacent to a pressure pipeline according to claim 1, characterized in that: The outer protective structure of the deep foundation pit comprises: a vertical protective structure, the vertical protective structure comprises isolation piles (5) and a supporting structure (6), and the isolation piles (5) are arranged between the supporting structure (6) and the pressure pipeline (1).

8. The method for constructing a deep foundation pit adjacent to a pressure pipeline according to claim 7, characterized in that: The outer protective structure of the deep foundation pit construction also includes: a horizontal protective structure, The horizontal enclosure structure includes: A first crown beam (7), the first crown beam (7) being arranged on the top of the isolation pile (5); a second crown beam (8), the second crown beam (8) being arranged on the top of the supporting structure (6); A connecting beam (9), the connecting beam (9) is used to connect the first crown beam (7) and the second crown beam (8).

9. The method for constructing a deep foundation pit adjacent to a pressure pipeline according to claim 1, characterized in that: The arrangement of the support inside the deep foundation pit comprises the step of sequentially arranging a concrete support (10) and a steel support (11) from top to bottom inside the excavated deep foundation pit.

10. A deep foundation pit structure adjacent to a pressure pipeline, characterized in that: The deep foundation pit structure is made by the construction method of the deep foundation pit adjacent to the pressure pipeline as described in any one of claims 1-9.

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