Shield method comprehensive pipe gallery cross joint structure

Abstract

The invention belongs to the technical field of shield method comprehensive pipe galleries, and particularly relates to a shield method comprehensive pipe gallery cross joint structure. The structure plane adopts a concentric double-circle layout, comprises an outer ring shaft and an inner ring shaft, and is vertically divided into a pipeline top layer, a pipe gallery upper layer, a pipe gallery lower layer and a pipeline bottom layer from shallow to deep. After the two shield pipe galleries are connected into the joint at the same elevation, thorough diversion of pipelines and personnel is achieved, the pipelines penetrate upwards or downwards to enter the top layer and the bottom layer of the pipelines, and the personnel enter inner ring shafts of the upper layer and the lower layer of the pipe galleries. The pipeline is connected and steered by bypassing 180 degrees or 90 degrees along the outer-ring shaft or the inner-ring shaft, the inner-ring shaft is centrally provided with pipe gallery functions such as ventilation, hoisting, personnel access and the like, and the inner-ring shaft is divided into independent fireproof subareas through fireproof doors and partition walls. The invention solves the problems of large burial depth, large plane size, pipeline and personnel streamline interference and the like of the traditional cross node, and has the advantages of high space utilization efficiency, high function integration level and low construction cost.

Description

Technical Field

[0001] This invention belongs to the field of shield tunneling integrated utility tunnel technology, specifically relating to a cross node structure when two shield tunneling integrated utility tunnels intersect in plane. Background Technology

[0002] Urban underground utility tunnels refer to underground structures that accommodate two or more types of municipal pipelines. Currently, there are two main construction techniques for utility tunnels: open-cut with foundation pit support and cut-and-cover tunneling. The cut-and-cover method primarily uses pipe jacking and shield tunneling. When the tunnel cross-section is large, the shield tunneling method is often used due to limitations in the diameter of the pipe jacking pipe. Shield tunneling has been widely applied in the construction of municipal infrastructure in large coastal cities.

[0003] In the planning and layout of integrated utility tunnels in a region, engineering projects often encounter intersections where two utility tunnels intersect perpendicularly or obliquely. At these intersections, some pipelines within the two tunnels need to be interconnected, while others need to cross each other; personnel need to pass through both tunnels simultaneously; the fire compartments of the two tunnels must be independent; and finally, the intersections also require ventilation, material hoisting, personnel access, and pipeline routing. Therefore, when dealing with intersections of double-layered, multi-compartment shield-tunneled utility tunnels, problems frequently arise such as chaotic pipeline connections, pipelines obstructing personnel passage, disordered fire compartments, chaotic ventilation, pipelines obstructing material hoisting, and pipelines unable to be routed out.

[0004] The current traditional solution is to reduce the burial depth of the utility tunnel in one direction, allowing it to pass underneath the tunnel in the other direction, and to create openings in the slab at the intersection for pipeline connection and personnel passage. This stacked approach increases the depth of the intersection and requires locally enlarging the planar dimensions to accommodate multi-compartment pipeline transfer and connection, as well as other functional requirements such as ventilation and material hoisting. For open-cut utility tunnels, the tunnel itself is relatively shallow, so deepening and enlarging the intersection has little impact on project investment. However, for shield tunneling utility tunnels, due to the greater burial depth and larger diameter of the shield, the above solution would result in excessively deep intersections and excessively large planar dimensions, leading to a significant increase in project investment. Summary of the Invention

[0005] To address the above technical issues, this invention proposes a shield tunnel integrated utility tunnel intersection node. By utilizing the smallest possible planar dimensions, it enables two shield tunnels to connect at the same elevation within the intersection node, ensuring smooth pipeline connections, pipeline crossings, and personnel passage within the intersection node. It also integrates functions such as ventilation, fire prevention, material hoisting, personnel access, and pipeline routing within the intersection node.

[0006] To achieve the above objectives, the present invention specifically adopts the following solution:

[0007] A shield-tunneling integrated utility tunnel intersection structure includes:

[0008] The outer and inner well casings are arranged in a concentric double-circular structure.

[0009] In cross-section, the structure, from shallow to deep, includes a top layer of pipeline, an upper layer of pipe gallery, a lower layer of pipe gallery, and a bottom layer of pipeline;

[0010] The x-direction shield tunnel and the y-direction shield tunnel are connected to the intersection node at the same elevation, and the elevation of the middle partition of the shield tunnel is flush with the elevation of the upper bottom plate of the tunnel.

[0011] Furthermore, after the shield tunnel connects to the intersection node, its internal pipelines are immediately diverted to the top and bottom layers of the pipelines, while personnel enter the inner ring shafts of the upper and lower layers of the tunnel, thus achieving spatial separation of pipelines and personnel.

[0012] Furthermore, the lower-level pipeline of the shield tunnel passes through the lower-level base plate of the tunnel and enters the bottom layer of the pipeline; the upper-level pipeline of the shield tunnel passes through the top-level base plate of the pipeline and enters the top layer of the pipeline.

[0013] Furthermore, the upper and lower pipelines of the x-direction shield tunnel, after entering the corresponding pipeline layer, circle around the outer ring shaft 180° and return to the original layer, and connect to the opposite x-direction shield tunnel.

[0014] Furthermore, in the upper and lower layers of the y-direction shield tunnel pipeline, the pipeline located in the middle position, after entering the corresponding pipeline layer, is laid straight along the y-direction and passes through the inner ring shaft to return to the original layer.

[0015] After entering the corresponding pipeline layer, the pipelines located on both sides circle the inner ring well shaft 180° and then return to the original layer;

[0016] Afterwards, all pipelines are connected to the opposite y-direction shield tunnel.

[0017] Furthermore, for the pipelines in the upper or lower layer of the x-direction shield tunnel that need to be connected to the y-direction shield tunnel, they can be connected to the y-direction shield tunnel after circling around the outer ring shaft at approximately 90° in the upper or lower layer of the tunnel.

[0018] Furthermore, between the inner and outer ring shafts of the upper and lower layers of the utility tunnel, pedestrian walkway partitions are provided along the x and y directions;

[0019] Fire doors are installed on the inner ring shaft in each direction;

[0020] Personnel inside the utility tunnel can enter the inner shaft through the passageway enclosed by the pedestrian walkway partition wall and the fire door, enabling personnel to pass through multiple directions and completely separating the space from the pipeline space.

[0021] Furthermore, the pedestrian walkway partition wall and the fire door together constitute the dividing interface of the fire compartment, dividing the internal space of the inner ring shaft into an independent fire compartment, so that the intersection node and the fire compartment of each shield tunnel are independent of each other.

[0022] Furthermore, during normal ventilation, the fire doors remain open, making the inner shaft a ventilation channel connecting each shield tunnel; during fire alarm, the fire doors in the direction of the fire automatically close, while the fire doors in other directions remain open.

[0023] Furthermore, the annular space between the inner and outer ring shafts is a pipeline laying area; the interior of the inner ring shaft is a space for the centralized arrangement of pipe gallery functions, and within the range of the lower bottom plate of the pipe gallery, the upper bottom plate of the pipe gallery, and the top bottom plate of the pipeline corresponding to the inner ring shaft, at least one functional opening is provided, including fan opening, hoisting opening, and ladder opening.

[0024] Furthermore, a pipeline outlet is provided on the outer ring wellbore at the top layer of the pipeline;

[0025] When the upper pipeline of the shield tunnel is laid on the top layer of the pipeline, it can be directly connected through the pipeline outlet.

[0026] When the lower-level pipeline of the shield tunnel is laid at the bottom layer of the pipeline, it can be lifted to the top layer of the pipeline through the vertical openings reserved in the upper-level bottom plate of the tunnel and / or the top-level bottom plate of the pipeline, and then exited through the pipeline outlet opening.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] The structure adopts a concentric double-circular planar layout and is divided into four layers from shallow to deep: the top layer of the pipeline, the upper layer of the tunnel, the lower layer of the tunnel, and the bottom layer of the pipeline. This allows the two shield tunnels to be connected at the same elevation, avoiding the traditional approach of having to lower the burial depth of one tunnel to pass underneath. This reduces the overall structural depth of the intersection node and effectively controls the amount of civil engineering work and project cost.

[0029] By immediately directing the pipelines at the access nodes to dedicated top and bottom pipeline sections, and setting up personnel access points within the inner ring shafts of the upper and lower levels of the utility tunnel, complete spatial separation of pipelines and personnel is achieved. This diversion method eliminates the obstruction of personnel passage by pipelines, ensuring unimpeded and safe movement, inspection, and evacuation of maintenance personnel within the utility tunnel and nodes.

[0030] By installing pedestrian walkway partitions between the inner and outer shafts and fire doors at corresponding locations in the inner shaft, not only are personnel flow routes standardized, but more importantly, these partitions and normally open fire doors serve as part of the ventilation system under normal circumstances. In the event of a fire, the fire doors on the fire side automatically close. This design strictly divides the internal space of the inner shaft into an independent fire compartment, ensuring that a fire cannot spread to other directions of the utility tunnel through intersections. This achieves the independence of the fire compartments and significantly improves the overall safety of the utility tunnel system.

[0031] This structure achieves multifunctional integration and partitioning of space. Pipelines are mainly laid in the annular area between the inner and outer ring shafts, while the internal space of the inner ring shaft is completely released for the centralized arrangement of functional facilities such as ventilation, material hoisting, personnel access, and vertical transportation. This allows for the efficient integration of various utility tunnel operation and maintenance functions within a compact space, with no conflict between the functions, reducing reliance on additional dedicated function chambers.

[0032] In terms of ventilation, the inner ring shaft and the normally open fire doors together form a highly efficient ventilation hub. Under normal circumstances, it serves as a two-way ventilation channel, providing fresh air to the connected pipe gallery or exhausting waste gas. In the event of a fire, the automatic closing of the fire doors on the fire side effectively isolates smoke and fire without affecting the normal ventilation of other non-fire areas, achieving an intelligent combination and rapid switching between ventilation and fire prevention / smoke exhaust functions.

[0033] For pipeline outgoing routes, pipeline outgoing openings are centrally located on the outer ring of the pipeline top layer, allowing pipelines laid in the annular space to be conveniently and locally exited. Lower-level pipelines can be lifted to the top layer through pre-reserved vertical openings and then exited together. This design results in centralized pipeline outgoing routes, clear paths, and easy connection to the municipal pipeline network, while ensuring that outgoing operations do not interfere with other functions within the node. Attached Figure Description

[0034] Figure 1 This is a bottom-layer plan view of the pipeline according to a certain embodiment of the present invention;

[0035] Figure 2 This is a plan view of the lower layer of the pipe gallery according to a certain embodiment of the present invention;

[0036] Figure 3 This is a plan view of the upper layer of the pipe gallery according to a certain embodiment of the present invention;

[0037] Figure 4 This is a top-level plan view of the pipeline according to a certain embodiment of the present invention;

[0038] Figure 5 This is a plan view of the top plate according to a certain embodiment of the present invention;

[0039] Figure 6 for Figures 1-5 Sectional view along AA;

[0040] Figure 7 for Figures 1-5 Sectional view along BB;

[0041] Figure 8 for Figures 1-5 Three-dimensional view along section AA;

[0042] Figure 9 for Figures 1-5 A 3D view along the BB section;

[0043] Figure 10 This is a cross-sectional view of the shield tunnel in a preferred embodiment of the present invention.

[0044] The diagram shows the following numbered sections: 1. Outer shaft; 2. Inner shaft; 2a. Reserved pipeline opening on basement level 4; 2b. Reserved pipeline opening on basement level 1; 3. X-direction shield tunnel; 3a. Lower-level pipelines in the X-direction shield tunnel; 3b. Upper-level pipelines in the X-direction shield tunnel; 4. Y-direction shield tunnel; 4a. Lower-level pipelines in the Y-direction shield tunnel; 4b. Upper-level pipelines in the Y-direction shield tunnel; 4c. Pipelines connecting the X-direction and Y-direction shield tunnels; 4d. Pipelines extending from the intersection node; 5. Pedestrian passage partition wall; 5a. Reserved pipeline opening; 6. Fire door; 6a. Inspection door; 7. Pipeline exit opening; 8. Ground-level manhole; 8 a. Ladder opening; 8b. Ladder with cage; 9. Ventilation shaft above ground; 9a. Fan opening; 9b. Vertical fan; 10. Lifting opening above ground; 10a. Lifting opening; 10b. Openable cover plate; 11b. Top slab; 11a. Top floor slab of pipeline; 12a. Upper floor slab of utility tunnel; 13a. Lower floor slab of utility tunnel; 11. Top floor of pipeline (first basement level); 12. Upper floor of utility tunnel (second basement level); 13. Lower floor of utility tunnel (third basement level); 14. Bottom floor of utility tunnel (fourth basement level); 15a. Upper compartment of shield tunnel; 15b. Lower compartment of shield tunnel; 15c. Middle partition of shield tunnel. Detailed Implementation

[0045] The terms “invention” and “the present invention” used in this specification are intended to broadly refer to all subject matter of this specification and any of the following patent claims. Statements containing these terms should not be construed as limiting the subject matter described herein or limiting the meaning or scope of any of the following patent claims. Furthermore, this specification does not attempt to describe or limit the subject matter covered by any claim of any particular component, paragraph, statement, or drawing of this application. The subject matter should be understood with reference to the entire specification, all drawings, and any of the following claims. The invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered limiting.

[0046] See Figure 10 As shown, both shield tunnel 3 and shield tunnel 4 have two-level cross-sections, separated by a central partition. The upper level is divided into two compartments 15a, which house pipelines including high-voltage cables, medium-voltage cables, optical fiber cables, and self-use pipelines. The lower level is a single compartment 15b, which houses pipelines including large-diameter water supply pipes, large-diameter reclaimed water pipes, medium-voltage cables, optical fiber cables, and self-use pipelines. The two compartments are separated by a central partition 15c.

[0047] See Figures 1 to 5 As shown in this embodiment, the x-direction is the shield tunnel 3, the y-direction is the shield tunnel 4, and the shield tunnel 3 and shield tunnel 4 are connected to the intersection node at the same elevation in a cross-shaped manner.

[0048] In this embodiment, the cross-node structure is a concentric double-circular structure, including an outer ring shaft 1 and an inner ring shaft 2; its cross-section is divided into four layers, from shallow to deep: the top layer of the pipeline (first underground layer) 11, the upper layer of the pipe gallery (second underground layer) 12, the lower layer of the pipe gallery (third underground layer) 13, and the bottom layer of the pipeline (fourth underground layer) 14. The elevation of the diaphragm 15c between the shield tunnel pipe gallery 3 and the shield tunnel pipe gallery 4 is flush with the elevation of the bottom plate 12a of the upper layer of the pipe gallery.

[0049] See Figure 1 , Figure 2 and Figure 8 , Figure 9 As shown, in this embodiment, after the lower-level pipeline 3a of the shield tunnel 3 in the x-direction connects to the intersection node, it immediately passes downward through the lower-level floor 13a of the tunnel and enters the bottom layer 14 of the pipeline. Then, it continues to circle approximately 180° between the inner and outer ring shafts in the bottom layer 14 of the pipeline before passing upward through the lower-level floor 13a of the tunnel and returning to the lower layer 13 of the tunnel to connect into the shield tunnel 3 in the x+ direction.

[0050] After the lower-level pipeline 4a of the shield tunnel 4 in the y- direction connects to the intersection node, it immediately passes downward through the lower-level floor slab 13a of the tunnel and enters the bottom layer 14 of the pipeline. Then, large-diameter water supply pipes and large-diameter reclaimed water pipes are laid in the bottom layer 14 of the pipeline along the y+ direction. Small-diameter pipelines such as cables, optical cables and self-use pipelines go around the inner ring shaft 2 for about 180° and pass through the inner ring shaft 2, then pass upward through the lower-level floor slab 13a of the tunnel, and return to the lower layer 13 of the tunnel to connect to the shield tunnel 4 in the y+ direction.

[0051] The pipeline 3a in the lower layer of the shield tunnel 3 needs to be connected to the pipeline 4c in the lower layer of the shield tunnel 4. It is connected to the shield tunnel 4 directly after going around the outer ring shaft 1 in the lower layer 13 of the tunnel by about 90°.

[0052] See Figure 3 , Figure 4 and Figure 8 , Figure 9 As shown, in this embodiment, after the upper-level pipeline 3b of the shield tunnel 3 in the x-direction connects to the intersection node, it immediately passes upward through the top floor plate 11a of the tunnel and enters the top floor 11 of the pipeline. Then, it circles approximately 180° between the inner and outer ring shafts of the top floor 11 of the pipeline and passes downward through the top floor plate 11a of the tunnel, returning to the upper floor 12 of the tunnel and connecting into the shield tunnel 3 in the x+ direction.

[0053] After the upper-level pipeline 4b of the shield tunnel 4 in the y-direction connects to the intersection node, it immediately passes upward through the top floor slab 11a of the tunnel and enters the top floor 11 of the pipeline. Then, the middle pipeline is laid in the y+ direction on the top floor 11 of the pipeline, and the pipelines on both sides go around the inner side of the inner ring shaft 2 by about 180° and pass through the inner ring shaft 2, then go downward through the top floor slab 11a of the tunnel and return to the upper floor 12 of the tunnel to connect into the shield tunnel 4 in the y+ direction.

[0054] The pipeline 3b in the upper layer of the shield tunnel 3 needs to be connected to the pipeline 4c in the upper layer of the shield tunnel 4. It is connected to the shield tunnel 4 directly after going around the outer ring shaft 1 in an arc of about 90° in the upper layer 12 of the tunnel.

[0055] In this embodiment, pipeline supports are installed on the inner side of the outer ring shaft 1 and the inner and outer sides of the inner ring shaft 1. When the lower pipeline 3a and upper pipeline 3b of the shield tunnel 3 and the lower pipeline 4a and upper pipeline 4b of the shield tunnel 4 run around the inner and outer ring shafts, they are directly laid on the pipeline supports.

[0056] In this embodiment, openings for the lower pipeline 3a of the shield tunnel 3 and the lower pipeline 4a of the shield tunnel 4 are reserved on the lower floor 13b of the tunnel; openings for the upper pipeline 3b of the shield tunnel 3 and the upper pipeline 4b of the shield tunnel 4 are reserved on the upper floor 11a of the pipeline. The gaps between the openings and the pipelines are sealed with flexible fireproof sealant.

[0057] The above-mentioned pipeline arrangement ensures that each pipeline in the upper and lower layers of the shield tunnel is connected to the opposite or adjacent tunnel via non-interfering lines, and at the same time, none of them enter the space of the upper layer 12 and lower layer 13 of the inner ring shaft 1 tunnel.

[0058] See Figure 2 , Figure 3 and Figure 6 , Figure 7 As shown, pedestrian walkway partitions 5 are installed along the x and y directions between the inner and outer ring shafts of the upper level 12 and lower level 13 of the tunnel. Fire doors 6 are installed on the inner ring shaft 2 corresponding to the x and y directions. Personnel inside the shield tunnel 3 and shield tunnel 4 enter the inner ring shaft 2 through the pedestrian walkways and fire doors 6, allowing personnel to pass through in all four directions within the inner ring shaft 2. Pipelines in the shield tunnel do not enter the inner ring shaft, thus not obstructing personnel passage. The pedestrian walkway partitions 5 and fire doors 6 in the four directions serve as dividing points for fire compartments within the shield tunnel, dividing the internal space of the inner ring shaft 2 into independent fire compartments, thereby achieving mutual independence of the fire compartments of the shield tunnel and its intersections.

[0059] In this embodiment, a pipeline opening 5a is reserved on the pedestrian passage partition wall 5. After the upper and lower pipelines of the pipe gallery pass through the opening, they enter the space between the inner and outer ring shafts. The gap between the opening and the pipeline is sealed with flexible fireproof sealant.

[0060] See Figures 2-7 As shown, within the inner ring shaft 2, ladder openings 8a are provided on the lower floor slab 13a, the upper floor slab 12a, and the top floor slab 11a of the pipeline. Ladders 8a with protective cages 8b connect the various ladder openings 8a. A surface manhole 8 is also provided on the top slab 11b. Personnel inside the shaft can travel between the upper and lower levels via the ladders 8b with protective cages and return to the surface through the surface manhole 8.

[0061] Within the inner ring shaft 2, a ground-level ventilation shaft 9 is installed on the top slab 11b, and fan openings 9a are provided on the top floor slab 11a of the pipeline and the upper floor slab 12a of the pipe gallery. Vertical fans 9b are installed in the fan openings 9a of the top floor slab 11a of the pipeline. During normal operation, the fire doors 6 on the inner ring shaft 2 are normally open, serving as ventilation channels connecting the pipe gallery and intersection nodes, providing bidirectional compressed or exhaust air to the two shield tunnels, ensuring normal ventilation within the pipe gallery. During a fire alarm, the fire doors 6 in the direction of the fire automatically close, while the remaining fire doors 6 remain open, without affecting normal ventilation of the shield tunnels in other directions. This arrangement of fire-resistant and ventilation zones ensures efficient daily ventilation while achieving precise fire isolation during a fire, ensuring that ventilation in non-fire-affected areas of the pipe gallery is not affected, minimizing the impact of a fire.

[0062] Within the inner ring shaft 2, a ground hoisting opening 10 is provided on the top slab 11b, and an openable cover plate 10b is provided on the top. Hoisting openings 10a are provided on the top floor slab 11a of the pipeline, the upper floor slab 12a of the pipe gallery, and the lower floor slab 13a of the pipe gallery. The openings are covered with openable fireproof covers, and railings are provided on the sides of the openings. These openings serve as hoisting openings for materials and pipe fittings to enter and exit the pipe gallery during operation. When materials are hoisted vertically into and out of the shaft, they will not be obstructed by the pipelines inside the shaft.

[0063] Inspection doors 6a are installed on the inner ring shaft 2 of the top layer 11 and the bottom layer 13 of the pipeline. Personnel can enter the space between the inner and outer ring shafts through the inspection doors 6a to replace and repair the pipeline. At the inspection doors 6a, the height of the pipeline and supports is locally raised to facilitate the access of maintenance personnel.

[0064] See Figure 7 As shown, when the upper-level pipeline 3b in the x-direction shield tunnel and the upper-level pipeline 4b in the y-direction shield tunnel are laid between the inner and outer ring shafts of the top layer 11 of the pipeline, they can be led out from the intersection node through the pipeline exit opening 7 set on the outer ring shaft. When the lower-level pipeline 3a in the x-direction shield tunnel and the lower-level pipeline 4a in the y-direction shield tunnel are laid between the inner and outer ring shafts of the lower layer 13 of the tunnel, they can be lifted to the top layer 11 of the pipeline through the vertical openings reserved on the upper layer bottom plate 12a and the top layer bottom plate 11a of the pipeline, and then led out from the intersection node through the pipeline exit opening 7 set on the outer ring shaft. The pipelines led out from the intersection node can be connected to the nearby municipal pipeline network system. Since the space between the inner and outer ring shafts is the main space for pipeline laying, and other tunnel functions such as personnel passage, material hoisting, and ventilation are concentrated inside the inner ring shaft 2, the connection of pipelines between the inner and outer ring shafts to the intersection node will not affect other tunnel functions.

[0065] The above embodiments are only a preferred technical solution of the present invention. The positions of the pipeline outlet 7, the ground-level manhole 8, the ground-level ventilation shaft 9, the ground-level hoisting opening 10, and the openings on each floor can be adjusted according to the actual engineering situation.

[0066] Those skilled in the art should understand that any modifications to the technical solutions or parameters in the embodiments without departing from the principles and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A cross-node structure for a shield-tunnel integrated utility tunnel, characterized in that, include: The outer ring well shaft (1) and the inner ring well shaft (2) are arranged in a concentric double circular structure. In cross section, the structure, from shallow to deep, includes a top layer of pipeline (11), an upper layer of pipe gallery (12), a lower layer of pipe gallery (13), and a bottom layer of pipeline (14). The x-direction shield tunnel (3) and the y-direction shield tunnel (4) are connected to the intersection node at the same elevation, and the elevation of the middle partition of the shield tunnel (3, 4) is flush with the elevation of the upper bottom plate (12a) of the tunnel.

2. The cross-node structure of the shield tunnel integrated utility tunnel according to claim 1, characterized in that: After the shield tunnel (3, 4) is connected to the intersection node, its internal pipelines are immediately diverted to the top layer (11) and the bottom layer (14) of the pipeline, while personnel enter the inner ring shaft (2) of the upper layer (12) and the lower layer (13) of the tunnel, thus realizing the spatial separation of pipelines and personnel.

3. The shield tunneling integrated utility tunnel intersection structure according to claim 2, characterized in that: The lower-level pipelines (3a, 4a) of the shield tunnel pass under the lower-level base plate (13a) of the tunnel and enter the bottom layer (14) of the pipeline; the upper-level pipelines (3b, 4b) of the shield tunnel pass over the top-level base plate (11a) of the pipeline and enter the top layer (11) of the pipeline.

4. The cross-node structure of the shield tunnel integrated utility tunnel according to claim 3, characterized in that: The upper and lower layer pipelines (3a, 3b) of the x-direction shield tunnel (3) enter the corresponding pipeline layer, then circle around the outer ring shaft (1) by 180° and return to the original layer, and connect to the opposite x-direction shield tunnel (3).

5. The shield tunneling integrated utility tunnel intersection structure according to claim 3, characterized in that: In the upper and lower layer pipelines (4a, 4b) of the y-direction shield tunnel (4), the pipeline located in the middle position, after entering the corresponding pipeline layer, is laid straight along the y-direction and passes through the inner ring shaft (2) to return to the original layer. After entering the corresponding pipeline layer, the pipelines located on both sides go around the inner ring well (2) by 180° and then return to the original layer; Afterwards, all pipelines are connected to the opposite y-direction shield tunnel (4).

6. The cross-node structure of the shield tunnel integrated utility tunnel according to claim 1, characterized in that: Between the inner ring shaft (2) and the outer ring shaft (1) of the upper layer (12) and the lower layer (13) of the pipe gallery, a pedestrian passage partition wall (5) is provided along the x and y directions; Fire doors (6) are installed on the inner ring shaft (2) in each direction; Personnel inside the utility tunnel can enter the inner shaft (2) through the passage enclosed by the pedestrian passage partition wall (5) and the fire door (6), enabling personnel to pass through multiple directions and completely separating them from the pipeline space.

7. The shield tunneling integrated utility tunnel intersection structure according to claim 6, characterized in that: The pedestrian passage partition wall (5) and the fire door (6) together form the separation interface of the fire compartment, dividing the internal space of the inner ring shaft (2) into an independent fire compartment, so that the intersection node and the fire compartments of each shield tunnel (3,4) are independent of each other.

8. The shield tunneling integrated utility tunnel intersection structure according to claim 1 or 7, characterized in that: During normal ventilation, the fire doors (6) remain open, making the inner shaft (2) a ventilation channel connecting each shield tunnel; during fire alarm, the fire doors (6) in the direction of the fire automatically close, while the fire doors (6) in other directions remain open.

9. The cross-node structure of the shield tunnel integrated utility tunnel according to claim 1, characterized in that: The annular space between the inner and outer ring shafts is the pipeline laying area; the interior of the inner ring shaft (2) is a space for the centralized arrangement of pipe gallery functions. Within the range of the lower bottom plate (13a) of the pipe gallery, the upper bottom plate (12a) of the pipe gallery, and the top bottom plate (11a) of the pipeline corresponding to the inner ring shaft (2), at least one of the following functional openings is provided: fan opening (9a), hoisting opening (10a), and ladder opening (8a).

10. The shield tunneling integrated utility tunnel intersection structure according to claim 1 or 9, characterized in that: A pipeline outlet (7) is provided on the outer ring well (1) of the top layer (11) of the pipeline; When the upper pipelines (3b, 4b) of the shield tunnel are laid on the top layer (11) of the pipeline, they can be directly connected through the pipeline outlet (7); When the lower-level pipelines (3a, 4a) of the shield tunnel are laid at the bottom layer (14) of the pipeline, they can be lifted to the top layer (11) of the pipeline through the vertical openings reserved on the upper-level bottom plate (12a) of the tunnel and / or the top-level bottom plate (11a) of the pipeline, and then connected through the pipeline outlet (7).

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