Soft soil layer deep foundation pit underground comprehensive pipe gallery supporting structure and construction method thereof

Abstract

A kind of soft soil layer deep foundation pit underground comprehensive pipe gallery supporting structure, including subway line area (1), it is characterized in that: one side of the subway line area (1) periphery is left piling area (2), the other side of subway line area (1) periphery is right piling area (3), located left concrete pile (4) and located right concrete pile (4) between along the spanning direction of underground comprehensive pipe gallery is erected with arc protective arch (6), two rows of support piles (13) are vertically fixed on arc protective arch (6) or cambered surface connecting component (8) and are arranged, located the same side support pile (13) between is provided with pipe gallery continuous wall (16) by concrete pouring, the present application has reasonable structure, arc protective arch is used as protective main structure, the load of structure, backfill soil and construction machine above subway line area is shared to the piling area outside bottom subway line area, the safety of subway line is guaranteed to the greatest extent.

Description

A support structure and construction method for underground integrated pipe gallery in deep foundation pits in soft soil layers. Technical Field

[0001] This invention relates to an underground integrated utility tunnel support structure and its construction method, and more particularly to an underground integrated utility tunnel support structure and its construction method for deep foundation pits in soft soil layers, belonging to the field of underground engineering technology. Background Technology

[0002] In recent years, with urban development, more and more cities are building subways and underground utility tunnels. Because subways and utility tunnels crisscross each other, it is inevitable that they will need to cross existing or under-construction subway lines. Urban underground rail transit is also developing rapidly, with an increasing number and density of subway lines under construction and operation, gradually forming an underground transportation network. Ensuring the stability of the soil and the safety of subway lines is crucial. More importantly, some subway lines cross rivers, lakes, and other soft soil layers with high water content. The underground subway tunnel segments and other structures are highly sensitive to changes in soil stress, highlighting the construction challenges of crossing subway lines. This has become one of the major technical obstacles restricting the construction of new subway lines and underground utility tunnels.

[0003] Traditional construction methods are insufficient to guarantee the stability of the soil and the safety of the subway line when constructing deep foundation pits that cross subway lines. This is especially true for deep foundation pit subway lines or underground utility tunnels, where the construction difficulty increases exponentially. Traditional underground utility tunnel structures pose significant safety hazards, as the support piles cannot effectively stabilize the sections crossing the subway line. Furthermore, the load-bearing capacity of these sections is limited, and traditional construction methods can easily damage the structural integrity of the soil beneath the subway line. The construction challenges of supporting deep foundation pits crossing subway lines have remained unresolved. A suitable support structure that is easy to construct, safe to install, and ensures the safety and stability of the subway line is lacking to address these technical problems. Summary of the Invention

[0004] The first objective of this invention is to address the shortcomings of deep foundation pits crossing subway lines, which cannot guarantee the stability of the soil around the subway line and the safety of the subway line, resulting in significant construction difficulties. Furthermore, traditional underground utility tunnel structures pose substantial safety hazards, and the support piles cannot provide effective fixation for the portion crossing the subway line, leading to poor safety performance. This invention provides a structurally sound underground utility tunnel support structure for deep foundation pits in soft soil layers. This structure employs advanced support for deep foundation pits, enabling advanced support around the perimeter of the subway line area, ensuring uniform stress distribution, maximizing the safety of the subway line, effectively solving the problem of fixing the support piles for underground utility tunnels, and improving construction efficiency.

[0005] The second objective of this invention addresses the significant challenges of constructing deep foundation pits for underground utility tunnels spanning subway lines. Traditional construction methods often fail to guarantee the stability of the soil beneath the subway line and its safety, and can easily damage the soil's structural integrity, resulting in poor construction safety. This invention provides a construction method for supporting underground utility tunnels in soft soil layers with a reasonable process, simple construction, and a solution that effectively addresses the construction difficulties of deep foundation pit support for underground utility tunnels spanning subway lines, while also improving construction quality.

[0006] To achieve the first objective mentioned above, the technical solution of this invention is: a support structure for an underground integrated utility tunnel in a deep foundation pit in soft soil, including a subway line area, characterized in that: directly above the subway line area is a deep foundation pit crossing construction area; one side of the subway line area is a left piling area, and the other side of the subway line area is a right piling area; one or more rows of concrete piles are respectively installed in the left and right piling areas; the concrete piles on the same side are cast as a single integral structure; and a structure crossing the subway line is erected above the concrete piles on the left and right sides. One or more parallel arc-shaped protective arches are installed along the crossing direction of the underground utility tunnel. Adjacent arc-shaped protective arches are connected and fixed by arc-shaped connecting components. The arc-shaped protective arches and the arc-shaped connecting components are intersected to form multiple equally spaced arc-shaped window openings. Support pile fixing seats are fixedly installed on the arc-shaped window openings along the distribution direction of two rows of parallel support piles. Support piles are vertically fixed on the support pile fixing seats. Two rows of support piles are vertically fixed on the arc-shaped protective arches or arc-shaped connecting components. A continuous wall of the utility tunnel is set between the support piles on the same side by concrete pouring.

[0007] Furthermore, multiple spliced ​​and fixed arc-shaped steel frames are erected on the soil surrounding the subway line area. Bottom templates are installed on the arc-shaped steel frames, and the span of the erected arc-shaped steel frames is greater than the maximum width of the subway line area.

[0008] Furthermore, an end anchorage is provided on the outer side of the concrete pile, the end of the arc-shaped protective arch is fixed on the end anchorage, a tensioning hole is provided inside the end anchorage, and a tensioning anchorage is provided at the outer end of the tensioning hole.

[0009] Furthermore, the interior of the arc-shaped protective arch is equipped with multiple prestressed steel bars or prestressed steel cables, and the span of the arc-shaped protective arch is greater than the maximum width of the subway line area.

[0010] Furthermore, the support pile fixing seat includes an upper fixing frame, a lower fixing frame, tie rods, and a flange fixing seat. The upper fixing frame is located on the upper part of the arc-shaped protective arch and the arc-shaped connecting component, and the lower fixing frame is located at the bottom of the arc-shaped protective arch and the arc-shaped connecting component. The upper fixing frame and the lower fixing frame are connected and fixed by tie rods and locking nuts. A flange fixing seat is fixedly installed on the upper fixing frame, and a support pile is vertically fixed on the flange fixing seat.

[0011] Furthermore, the lower or middle part of the support pile is connected and fixed to the arc-shaped protective arch or arc-shaped connecting component by a fixed diagonal brace, and the top of the support pile on the same side is fixedly provided with a horizontally distributed crown beam.

[0012] Furthermore, a horizontal support rod is fixedly installed between the two rows of parallel support piles.

[0013] Furthermore, a backfill area is provided on the upper arc surface of the arc-shaped protective arch, and the upper surface of the backfill area is set to be horizontal.

[0014] To achieve the second objective mentioned above, the technical solution of this invention is: a construction method for the support structure of an underground integrated pipe gallery in a deep foundation pit in soft soil, characterized by the following steps:

[0015] a. First, mark the outer outline of the subway line area and determine the specific location of the area crossing the subway line;

[0016] b. Next, select the left piling area on one side of the subway line area and the right piling area on the other side of the subway line area.

[0017] c. Subsequently, one or more rows of concrete piles are set in the left and right pile driving areas respectively, and end anchorages are set on the outside of the concrete piles.

[0018] d. Next, an arc-shaped protective arch spanning the subway line area is erected on the concrete pile, and adjacent arc-shaped protective arches are connected and fixed by arc-shaped connecting components.

[0019] e. Then, multiple support pile fixing seats are fixedly installed in the arc-shaped window hole along the straight line of the distribution of two rows of support piles. Support piles are vertically fixed on the support pile fixing seats. At the same time, a continuous wall of the pipe gallery is installed between the support piles on the same side by pouring concrete.

[0020] f. Finally, a backfill area was set on the upper arc surface of the arc-shaped protective arch, completing the support construction operation of the deep foundation pit of the underground integrated pipe gallery.

[0021] Furthermore, in step e or step f, the top of the support piles located on the same side are fixedly provided with horizontally distributed cap beams, and horizontal support rods are fixedly provided between the two rows of parallel support piles.

[0022] The beneficial effects of this invention are:

[0023] 1. This invention uses an arc-shaped protective arch as the main protective structure. Deep foundation pit advanced support is carried out around the outer soil of the subway line area. The load on the lower part of the subway line area from the structures above the subway line area, backfill soil and construction equipment is distributed to the pile driving area outside the bottom of the subway line area, so as to maximize the safety of the subway line.

[0024] 2. This invention forms multiple equally spaced arc-shaped window holes by interlacing the arc-shaped protective arch and the arc-shaped connecting components. By selecting different positions of the arc-shaped window holes, support piles with different span angles can be easily installed. The support piles are fixed to the arc-shaped protective arch by the support pile fixing seat, which effectively solves the problem of fixing and supporting the support piles of the underground integrated pipe gallery.

[0025] 3. The present invention has a reasonable structure, which fundamentally solves the construction problem of deep foundation pit support for underground integrated pipe gallery that crosses subway lines. It avoids damage to the soil structure of the subway line below, avoids the adverse effects of vibration force generated during construction on the subway line, and can cross the subway line at different angles as needed, thus improving construction efficiency. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the end face structure of the arc-shaped protective arch of the present invention.

[0027] Figure 2 is a top view of the arc-shaped protective arch of the present invention.

[0028] Figure 3 is a structural schematic diagram of the arc-shaped protective arch of the present invention when the arc-shaped steel frame is installed.

[0029] Figure 4 is a schematic diagram of the end face of the arc-shaped protective arch of the present invention after the support piles are installed.

[0030] Figure 5 is a schematic diagram of the structure after the support piles are installed on the arc-shaped protective arch of the present invention.

[0031] Figure 6 is a schematic diagram of the bottom fixing structure of the support pile of the present invention.

[0032] Figure 7 is a structural schematic diagram of the continuous wall of the pipe gallery of the present invention.

[0033] Figure 8 is a schematic diagram of the support structure of the present invention.

[0034] In the diagram: Metro Line Area 1, Left Piling Area 2, Right Piling Area 3, Concrete Pile 4, End Anchor Seat 5, Arched Protective Arch 6, Prestressed Steel Reinforcement 7, Arched Connecting Component 8, Arched Window Hole 9, Arched Steel Frame 10, Bottom Formwork 11, Support Pile Fixing Seat 12, Support Pile 13, Fixed Diagonal Brace 14, Crown Beam 15, Pipe Gallery Continuous Wall 16, Horizontal Support Rod 17, Upper Fixed Frame 18, Lower Fixed Frame 19, Tie Rod 20, Flange Fixing Seat 21, Backfill Area 22. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Referring to Figures 1 to 8, the present invention discloses a support structure for an underground integrated utility tunnel in a deep foundation pit in soft soil, comprising a subway line area 1. The structure is characterized in that: directly above the subway line area 1 is the underground deep foundation pit crossing construction area; one side of the subway line area 1 is a left piling area 2, and the other side of the subway line area 1 is a right piling area 3; one or more rows of concrete piles 4 are respectively installed in the left piling area 2 and the right piling area 3; the concrete piles 4 on the same side are cast as a single integral structure; and one or more parallel supporting structures are erected above the concrete piles 4 on the left and right sides, crossing the subway line area 1. The arc-shaped protective arch 6 is erected along the crossing direction of the underground integrated pipe gallery. Adjacent arc-shaped protective arches 6 are connected and fixed by arc-shaped connecting components 8. The arc-shaped protective arches 6 and the arc-shaped connecting components 8 are intersected to form multiple equally spaced arc-shaped window holes 9. Support pile fixing seats 12 are fixedly installed on the arc-shaped window holes 9 along the distribution direction of two rows of parallel support piles 13. Support piles 13 are vertically fixed on the support pile fixing seats 12. Two rows of support piles 13 are vertically fixed on the arc-shaped protective arches 6 or the arc-shaped connecting components 8. A continuous wall 16 of the pipe gallery is set between the support piles 13 on the same side by concrete pouring.

[0037] Multiple spliced ​​and fixed arc-shaped steel frames 10 are erected on the soil above the outer perimeter of the subway line area 1. Bottom templates 11 are installed on the arc-shaped steel frames 10, and the span of the erected arc-shaped steel frames 10 is greater than the maximum width of the subway line area 1.

[0038] An end anchor 5 is provided on the outer side of the concrete pile 4, and the end of the arc-shaped protective arch 6 is fixed on the end anchor 5. A tensioning hole is provided inside the end anchor 5, and a tensioning anchor is provided at the outer end of the tensioning hole.

[0039] The interior of the arc-shaped protective arch 6 is provided with multiple prestressed steel bars 7 or prestressed steel cables, and the span of the arc-shaped protective arch 6 is greater than the maximum width of the subway line area 1.

[0040] The support pile fixing seat 12 includes an upper fixing frame 18, a lower fixing frame 19, a tie rod 20, and a flange fixing seat 21. The upper fixing frame 18 is located on the upper part of the arc-shaped protective arch 6 and the arc-shaped connecting member 8, and the lower fixing frame 19 is located at the bottom of the arc-shaped protective arch 6 and the arc-shaped connecting member 8. The upper fixing frame 18 and the lower fixing frame 19 are connected and fixed by the tie rod 20 and the locking nut. The flange fixing seat 21 is fixedly installed on the upper fixing frame 18, and the support pile 13 is vertically fixed on the flange fixing seat 21.

[0041] The lower or middle part of the support pile 13 is connected and fixed to the arc-shaped protective arch 6 or the arc-shaped connecting component 8 by the fixed diagonal brace 14, and the top of the support pile 13 located on the same side is fixedly provided with a horizontally distributed crown beam 15.

[0042] A horizontal support rod 17 is fixedly installed between the two rows of parallel support piles 13.

[0043] The upper surface of the arc-shaped protective arch 6 is provided with a backfill area 22, and the upper surface of the backfill area 22 is set to be horizontal.

[0044] A construction method for the support structure of an underground integrated pipe gallery in a deep foundation pit in soft soil layer, characterized by the following steps:

[0045] a. First, mark the outer outline of subway line area 1 and determine the specific location that crosses subway line area 1;

[0046] b. Next, select the left piling area 2 on one side of the outer perimeter of the subway line area 1, and select the right piling area 3 on the other side of the outer perimeter of the subway line area 1.

[0047] c. Subsequently, one or more rows of concrete piles 4 are set in the left pile driving area 2 and the right pile driving area 3 respectively, and end anchor seats 5 are set on the outside of the concrete piles 4.

[0048] d. Next, an arc-shaped protective arch 6 is erected on the concrete pile 4 to cross the subway line area 1. Adjacent arc-shaped protective arches 6 are connected and fixed by arc-shaped connecting components 8.

[0049] e. Then, multiple support pile fixing seats 12 are fixedly installed in the arc window hole 9 along the straight line of the two rows of support piles 13. Support piles 13 are vertically fixed on the support pile fixing seats 12. At the same time, a pipe gallery continuous wall 16 is installed between the support piles 13 on the same side by pouring concrete.

[0050] f. Finally, a backfill area 22 is set on the upper arc surface of the arc-shaped protective arch 6, completing the support construction operation of the deep foundation pit of the underground integrated pipe gallery.

[0051] In step e or step f, the top of the support piles 13 located on the same side is fixedly provided with a horizontally distributed crown beam 15, and a horizontal support rod 17 is fixedly provided between the two rows of parallel support piles 13.

[0052] Referring to Figure 1, this invention provides advanced support for deep foundation pits crossing existing or under-construction subway lines, maximizing the absolute safety of subway line area 1 and avoiding adverse effects on the subway line caused by underground utility tunnel construction directly above it. This invention employs an arc-shaped protective arch as the main protective structure, essentially erecting a protective arch around the surrounding soil of subway line area 1. The weight of the backfill, support structure, and other structures in the area crossing above subway line area 1 will not directly affect it. The specific structure is as follows:

[0053] Directly above Metro Line Area 1 is the underground deep foundation pit crossing construction area. One side of Metro Line Area 1 is the left piling area 2, and the other side is the right piling area 3. Left piling area 2 and right piling area 3 are located outside the metro line protection zone and are symmetrically arranged. Each of the left and right piling areas contains one or more rows of concrete piles 4. These concrete piles 4 are either cast-in-place piles or concrete mixing piles. The concrete piles 4 on the same side are cast as a single, integral structure, serving as the arched protective arch structure and the supporting foundation for bearing the weight above.

[0054] One or more parallel arc-shaped protective arches 6 are erected above the concrete pile 4 on the left and the concrete pile 4 on the right. The arc-shaped protective arches 6 span the subway line area 1, and the arc shape of the protective arches 6 is erected along the crossing direction of the underground integrated pipe gallery. The span of the arc-shaped protective arches 6 is greater than the maximum width of the subway line area 1. Adjacent arc-shaped protective arches 6 are connected and fixed by arc-shaped connecting members 8. Alternatively, multiple arc-shaped protective arches 6 can be cast into a single integral structure to avoid the adverse effects of vibration generated during construction on the subway line. End anchor seats 5 are provided on the outer side of the concrete piles 4. The ends of the arc-shaped protective arches 6 are fixed to the end anchor seats 5. Tensioning holes are provided inside the end anchor seats 5, and tensioning anchor seats are provided at the outer ends of the tensioning holes. Multiple prestressed steel bars 7 or prestressed steel cables are provided inside the arc-shaped protective arches 6. After prestressing tensioning, the prestressed steel bars 7 or prestressed steel cables are fixed to the end anchor seats 5.

[0055] To facilitate the fixing of the support piles 13 to the arc-shaped protective arch 6, the present invention forms multiple equally spaced arc-shaped window holes 9 in a crisscross pattern between the arc-shaped protective arch 6 and the arc-shaped connecting member 8. The arc-shaped window holes 9 are distributed longitudinally and laterally along the arc surface. Support pile fixing seats 12 are fixedly installed on the arc-shaped window holes 9 along the distribution direction of the two rows of parallel support piles 13. The support pile fixing seat 12 includes an upper fixing frame 18, a lower fixing frame 19, a tie rod 20, and a flange fixing seat 21. The upper fixing frame 18 is located at the upper part of the arc-shaped protective arch 6 and the arc-shaped connecting member 8, and the lower fixing frame 19 is located at the bottom of the arc-shaped protective arch 6 and the arc-shaped connecting member 8. The upper fixing frame 18 and the lower fixing frame 19 are connected and fixed by the tie rod 20 and the locking nut. The flange fixing seat 21 is fixedly installed on the upper fixing frame 18, and the support piles 13 are vertically fixed on the flange fixing seat 21.

[0056] Crossing the subway line area 1 can be done not only vertically, but also at a certain angle to the subway line axis. By selecting different positions of the arc-shaped window holes 9, support piles 13 with different crossing angles can be easily installed. The support piles 13 are arranged in two parallel rows. A continuous pipe gallery wall 16 is set between the support piles 13 on the same side by pouring concrete. A horizontally distributed cap beam 15 is fixed at the top of the support piles 13 on the same side. A horizontal support rod 17 is fixed between the two rows of parallel support piles 13.

[0057] The specific steps of the construction method for the underground integrated utility tunnel support structure in the soft soil deep foundation pit crossing the urban underground rail line of the present invention are as follows: First, mark the outer contour of the subway line area 1 and determine the specific location of crossing the subway line area 1. Then, select the left piling area 2 on one side of the outer perimeter of the subway line area 1 and the right piling area 3 on the other side of the outer perimeter of the subway line area 1. Subsequently, set one or more rows of concrete piles 4 in the left piling area 2 and the right piling area 3 respectively, and set the end anchoring seat 5 on the outside of the concrete piles 4. Next, erect the arc-shaped protective arch 6 crossing the subway line area 1 on the concrete piles 4, and connect and fix adjacent arc-shaped protective arches 6 through arc-shaped connecting members 8. Then, fix multiple support pile fixing seats 12 in the arc-shaped window holes 9 along the straight line distributed by the two rows of support piles 13, and fix the support piles 13 vertically on the support pile fixing seats 12. At the same time, a continuous wall 16 of the utility tunnel is set between the support piles 13 on the same side by pouring concrete. Finally, a backfill area 22 is set on the upper arc surface of the arc-shaped protective arch 6 to complete the advanced support construction operation of the deep foundation pit of the underground integrated pipe gallery.

[0058] The above description is a further detailed explanation of the present invention in conjunction with specific embodiments. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple substitutions, improvements and changes can be made to the present invention without departing from the concept of the present invention. All such simple substitutions, improvements and changes should be considered to fall within the protection scope of the present invention.

Claims

1. A support structure for an underground integrated utility tunnel in a deep foundation pit in soft soil, including a subway line area (1), characterized in that: The area directly above the subway line area (1) is the underground deep foundation pit crossing construction area. The outer perimeter of one side of the subway line area (1) is the left piling area (2), and the outer perimeter of the other side of the subway line area (1) is the right piling area (3). One or more rows of concrete piles (4) are set in the left piling area (2) and the right piling area (3). The concrete piles (4) on the same side are cast as an integral structure. One or more parallel arc-shaped protective arches (6) are erected above the concrete piles (4) on the left side and the concrete piles (4) on the right side, crossing the subway line area (1). The arc-shaped arches (6) are erected along the crossing direction of the underground integrated pipe gallery. The adjacent arc-shaped protective arches (6) 6) are connected and fixed by arc-shaped connecting components (8). The arc-shaped protective arch (6) and the arc-shaped connecting components (8) are intersected to form multiple equally spaced arc-shaped window holes (9). Support pile fixing seats (12) are fixedly installed on the arc-shaped window holes (9) along the distribution direction of two rows of parallel support piles (13). Support piles (13) are vertically fixed on the support pile fixing seats (12). Two rows of support piles (13) are vertically fixed on the arc-shaped protective arch (6) or the arc-shaped connecting components (8). A continuous wall (16) of the pipe gallery is set between the support piles (13) on the same side by concrete pouring. Multiple spliced ​​and fixed arc-shaped steel frames (10) are erected on the soil outside the subway line area (1). A bottom template (11) is installed on the steel frame (10). The span of the erected arc-shaped steel frame (10) is greater than the maximum width of the subway line area (1). An end anchor (5) is provided on the outside of the concrete pile (4). The end of the arc-shaped protective arch (6) is fixed on the end anchor (5). Tensioning holes are provided inside the end anchor (5). Tensioning anchors are provided at the outer end of the tensioning holes. Multiple prestressed steel bars (7) or prestressed steel cables are provided inside the arc-shaped protective arch (6). The span of the arc-shaped protective arch (6) is greater than the maximum width of the subway line area (1). The support pile fixing seat (12) includes an upper fixing frame (18), a lower fixing frame (19), tie rods (20), and a flange fixing seat (2). 1) The upper fixed frame (18) is located on the upper part of the arc-shaped protective arch (6) and the arc-shaped connecting member (8), and the lower fixed frame (19) is located at the bottom of the arc-shaped protective arch (6) and the arc-shaped connecting member (8). The upper fixed frame (18) and the lower fixed frame (19) are connected and fixed by tie rods (20) and locking nuts. A flange fixing seat (21) is fixed on the upper fixed frame (18), and a support pile (13) is vertically fixed on the flange fixing seat (21). The lower or middle part of the support pile (13) is connected and fixed to the arc-shaped protective arch (6) or the arc-shaped connecting member (8) by a fixed diagonal brace (14). A horizontally distributed crown beam (15) is fixed at the top of the support pile (13) on the same side.

2. The underground integrated pipe gallery support structure for deep foundation pits in soft soil layers according to claim 1, characterized in that: A horizontal support rod (17) is fixedly installed between the two rows of parallel support piles (13).

3. The underground integrated pipe gallery support structure for deep foundation pits in soft soil layers according to claim 1, characterized in that: The upper surface of the arc-shaped protective arch (6) is provided with a backfill area (22), and the upper surface of the backfill area (22) is set to be horizontal.

4. A construction method for an underground integrated pipe gallery support structure for deep foundation pits in soft soil layers as described in claim 1, characterized in that... Includes the following steps: a. First, mark the outer outline of the subway line area (1) and determine the specific location of crossing the subway line area (1); b. Then, select the left piling area (2) on one side of the subway line area (1) and the right piling area (3) on the other side of the subway line area (1); c. Then, set one or more rows of concrete piles (4) in the left piling area (2) and the right piling area (3) respectively, and set end anchorages (5) on the outside of the concrete piles (4); d. Then, erect an arc-shaped protective arch that crosses the subway line area (1) on the concrete piles (4). (6) Adjacent arc-shaped protective arches (6) are connected and fixed by arc-shaped connecting components (8); e) Then, multiple support pile fixing seats (12) are fixedly installed in the arc-shaped window hole (9) along the straight line of the two rows of support piles (13). Support piles (13) are vertically fixed on the support pile fixing seats (12). At the same time, a continuous wall (16) of the pipe gallery is set between the support piles (13) on the same side by concrete pouring; f) Finally, a backfill area (22) is set on the arc surface of the upper surface of the arc-shaped protective arch (6), and the support construction operation of the deep foundation pit of the underground integrated pipe gallery is completed.

5. The construction method for the underground integrated pipe gallery support structure of a deep foundation pit in soft soil layer according to claim 4, characterized in that: In step e or step f, the top of the support piles (13) located on the same side is fixedly provided with a horizontally distributed crown beam (15), and a horizontal support rod (17) is fixedly provided between the two rows of parallel support piles (13).

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