Primary support skeleton node structure of dark excavated tunnel

Abstract

The embodiment of the present application provides a primary support skeleton node structure of a dark excavated tunnel, comprising: a primary support guide tunnel structure arranged vertically; a temporary inverted arch structure arranged horizontally; wherein any one or both of the primary support guide tunnel structure and the temporary inverted arch structure are preset with a welding fixing part, and the primary support guide tunnel structure and the temporary inverted arch structure are welded and fixed by the welding fixing part. The embodiment of the present application solves the technical problem that the primary support skeleton node structure of a traditional dark excavated tunnel is not firmly fixed.

Description

Technical Field

[0001] The present application relates to the technical field of dark-excavated tunnels in construction engineering, and in particular to a primary support skeleton node structure of a dark-excavated tunnel. Background Art

[0002] In urban rail transit projects, dark excavation is a commonly used construction method, that is, dark excavation is used for construction. When the dark excavation method is used for construction, the part of the tunnel body to be excavated needs to be divided into a multi-chamber structure. When the dark excavation multi-chamber structure is divided into chambers for excavation, there will inevitably be a node position where the temporary invert structure of the primary support skeleton and the primary support guide tunnel structure intersect, that is, the node structure of the temporary invert structure and the primary support guide tunnel structure appears. The node position in the middle of the tunnel body is a cross-shaped node structure, and the node position at the edge of the tunnel body is a T-shaped node structure. The node structure of the temporary invert structure and the primary support guide tunnel structure is an important measure to control stratum settlement.

[0003] The primary support skeleton node structure of the traditional dark-bored tunnel is connected by bolts and bolt holes. At the node position, the bolt holes of the temporary invert structure and the primary support guide tunnel structure cannot be aligned, and the bolts cannot be tightened normally. That is, the fixed connection of the primary support skeleton node structure of the traditional dark-bored tunnel is not stable, and the ground settlement is out of control.

[0004] Therefore, the unstable fixed connection of the primary support skeleton node structure of the traditional dark-excavated tunnel is a technical problem that technical personnel in this field urgently need to solve.

[0005] The above information disclosed in the background section is only for enhancing understanding of the background of the present application and therefore it may contain information that does not form the prior art known to a person of ordinary skill in the art. Summary of the invention

[0006] The embodiment of the present application provides a primary support skeleton node structure of a dark-bored tunnel to solve the technical problem of unstable fixed connection of the primary support skeleton node structure of a traditional dark-bored tunnel.

[0007] The embodiment of the present application provides a primary support skeleton node structure of a dark excavated tunnel, including:

[0008] The primary support and guide tunnel structure is set vertically;

[0009] Temporary inverted arch structure set horizontally;

[0010] Wherein, any one or both of the primary support guide tunnel structure and the temporary invert arch structure are preset with a welding fixing part, and the primary support guide tunnel structure and the temporary invert arch structure are welded and fixed by the welding fixing part.

[0011] The embodiment of the present application adopts the above technical solution, which has the following technical effects:

[0012] Any one or both of the vertically arranged primary guide tunnel structure and the horizontally arranged temporary inverted arch structure are preset with a welding fixing part, and the primary guide tunnel structure and the temporary inverted arch structure are welded and fixed by the welding fixing part. Compared with the fixing by bolts and bolt holes in the background technology, the method of welding and fixing the primary guide tunnel structure and the temporary inverted arch structure by the welding fixing part firstly introduces the welding fixing part. As a component, the size of the welding fixing part can be controlled according to actual needs, and there is no need to perform delicate operations such as aligning two bolt holes and then tightening the bolts. Secondly, the primary guide tunnel structure and the temporary inverted arch structure are fixed by welding, which makes the primary support skeleton node structure more effective and stable, and can effectively control the situation of stratum settlement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0014] Figure 1 A schematic diagram of a primary support skeleton node structure of a dark-excavated tunnel according to an embodiment of the present application;

[0015] Figure 2 for Figure 1 The schematic diagram of the primary support skeleton node structure before welding and fixation is shown;

[0016] Figure 3 A schematic cross-sectional view of a grid structure of a primary support skeleton node structure according to an embodiment of the present application;

[0017] Figure 4 A schematic diagram of a primary support skeleton node structure of a dark-excavated tunnel according to another embodiment of the present application;

[0018] Figure 5 for Figure 4 The schematic diagram of the primary support skeleton node structure before welding and fixation is shown;

[0019] Figure 6 for Figure 4 A schematic diagram of an L-shaped angle steel of a temporary invert structure of the primary support skeleton node structure shown;

[0020] Figure 7 for Figure 4 AA section view;

[0021] Figure 8 for Figure 4 A schematic diagram of the first embedded plate of the primary support guide tunnel structure of the primary support skeleton node structure shown;

[0022] Fig. 9 A schematic diagram of a primary support skeleton node structure of a dark-excavated tunnel according to another embodiment of the present application;

[0023] Fig.10 for Fig. 9 The schematic diagram of the primary support skeleton node structure before welding and fixation is shown;

[0024] Fig.11 for Fig. 9 BB cross-sectional view;

[0025] Fig.12 for Fig. 9 A schematic diagram of the second embedded plate of the primary support guide tunnel structure of the primary support skeleton node structure is shown.

[0026] Description of reference numerals:

[0027] 100 initial support guide tunnel structure, 110 U-shaped anchor bar, 120 first embedded plate, 130 second embedded plate,

[0028] 200 temporary invert structure, 210 vertical bend, 220 L-shaped angle steel, 230 welded steel plate,

[0029] 300 grid structure, 310 main reinforcement, 320 connecting reinforcement,

[0030] 331 Z-shaped reinforcement ribs, 332 I-shaped reinforcement ribs. DETAILED DESCRIPTION

[0031] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0032] Embodiment 1

[0033] Figure 1 A schematic diagram of a primary support skeleton node structure of a dark-excavated tunnel according to an embodiment of the present application; Figure 2 for Figure 1 The schematic diagram of the primary support skeleton node structure before welding and fixation is shown; Figure 4 A schematic diagram of a primary support skeleton node structure of a dark-excavated tunnel according to another embodiment of the present application; Figure 5 for Figure 4 The schematic diagram of the primary support skeleton node structure before welding and fixation is shown; Fig. 9 A schematic diagram of a primary support skeleton node structure of a dark-excavated tunnel according to another embodiment of the present application; Fig.10 for Fig. 9Schematic diagram of the primary support skeleton node structure before welding and fixation.

[0034] like Figure 1 and Figure 2 , Figure 4 and Figure 5 , Fig. 9 and Fig.10 As shown, the primary support skeleton node structure of the dark excavation tunnel of the embodiment of the present application includes:

[0035] A primary support guide tunnel structure 100 arranged vertically;

[0036] A temporary invert structure 200 disposed laterally;

[0037] Wherein, any one or both of the primary support guide tunnel structure and the temporary invert arch structure are preset with a welding fixing part, and the primary support guide tunnel structure and the temporary invert arch structure are welded and fixed by the welding fixing part.

[0038] In the primary support skeleton node structure of the dark excavated tunnel of the embodiment of the present application, any one or both of the vertically arranged primary support guide tunnel structure and the horizontally arranged temporary inverted arch structure are preset with a welding fixing part, and the primary support guide tunnel structure and the temporary inverted arch structure are welded and fixed by the welding fixing part. Compared with the fixing by bolts and bolt holes in the background technology, the method of welding and fixing the primary support guide tunnel structure and the temporary inverted arch structure by the welding fixing part firstly introduces the welding fixing part as a component, and the size of the welding fixing part as a component can be controlled according to actual needs, and there is no need to perform delicate operations such as aligning two bolt holes and then tightening the bolts. Secondly, the primary support guide tunnel structure and the temporary inverted arch structure are fixed by welding, which makes the primary support skeleton node structure more effective and stable, and can effectively control the situation of stratum settlement.

[0039] In implementation, such as Figure 1 , Figure 4 and Fig. 9 As shown, the primary branch guide tunnel structure 100 and the temporary invert structure 200 are welded and fixed to form a T-shaped node structure.

[0040] During construction by the dark excavation method, the part of the tunnel body to be excavated needs to be divided into a multi-chamber structure. When the dark excavation multi-chamber structure is divided into chambers for excavation, there will inevitably be a node position where the temporary invert structure of the initial support skeleton and the initial support guide tunnel structure intersect, that is, the node structure of the temporary invert structure and the initial support guide tunnel structure appears. The node position in the middle of the tunnel body is a cross-shaped node structure, and the node position at the edge of the tunnel body is a T-shaped node structure. The node structure of the temporary invert structure and the initial support guide tunnel structure is an important measure to control stratum settlement. The node structure of the initial support skeleton of the dark excavation tunnel of the embodiment of the present application is particularly suitable for the node structure at the node position at the edge of the tunnel body.

[0041] Embodiment 2

[0042] The primary support skeleton node structure of the embodiment of the present application, based on the embodiment 1, also has the following technical features:

[0043] Figure 3 Schematic diagram of the cross section of the grid structure of the primary support skeleton node structure of the embodiment of the present application. Figure 3 As shown, the primary support guide tunnel structure is the primary support guide tunnel structure of the grid structure 300, and the temporary invert structure is the temporary invert structure of the grid structure 300;

[0044] The grid structure includes four main ribs 310 and multiple groups of connecting ribs, each group of connecting ribs includes four connecting ribs 320; wherein the four main ribs 310 are located at four vertices of the same rectangular frame, and the four connecting ribs 320 of each group of connecting ribs are respectively connected between two adjacent main ribs to form a rectangular frame.

[0045] Both the primary support tunnel structure and the temporary invert structure adopt a structurally stable grid structure, which makes the structure of the entire primary support skeleton node structure stable.

[0046] Specifically, Figure 3 As shown, the rectangular frames formed by the groups of connecting ribs 320 are arranged at intervals along the length direction of the main ribs.

[0047] In this way, each group of connecting ribs and the main ribs are welded and fixed together to form a grid structure. The groups of connecting ribs arranged at intervals along the length direction of the main ribs make the entire grid structure more stable.

[0048] Specifically, Figure 1 and Figure 2 As shown, the grid structure further includes a reinforcing rib, and both ends of the reinforcing rib are respectively welded and fixed between two oppositely arranged main ribs to enhance the stability of the grid structure;

[0049] The reinforcing ribs of the temporary invert structure are Z-shaped reinforcing ribs 331 , and the reinforcing ribs of the primary support guide tunnel structure are I-shaped reinforcing ribs 332 .

[0050] The presence of reinforcement ribs makes the entire grille structure more stable.

[0051] As a specific implementation method, Figure 1 and Figure 2 As shown, one end of the main reinforcement of each temporary inverted arch structure has a vertical bend 210, and the vertical bend 210 serves as the welding fixing portion; that is, only the temporary inverted arch structure itself is preset with a welding fixing portion, and the primary support guide tunnel structure itself does not have a preset welding fixing portion;

[0052] Each of the vertical bends 210 passes through the two main bars in front of the primary support guide tunnel structure, extends into the primary support guide tunnel structure, and is fixed to the two main bars at the rear of the primary support guide tunnel structure by welding.

[0053] The vertical bend as the welding fixing part welds the primary guide tunnel structure and the temporary invert arch structure into double-sided welding, and the weld length is full welding. By controlling the welding length, it can ensure that the welding and fixing of the primary guide tunnel structure and the temporary invert arch structure are more stable.

[0054] The primary support skeleton node structure with a vertically bent temporary inverted arch structure has a simple structure and is easy to build. It is especially suitable for construction environments with large cavern widths and high requirements for controlled settlement.

[0055] Figure 4 A schematic diagram of a primary support skeleton node structure of a dark-excavated tunnel according to another embodiment of the present application; Figure 5 for Figure 4 The schematic diagram of the primary support skeleton node structure before welding and fixation is shown; Figure 6 for Figure 4 A schematic diagram of an L-shaped angle steel of a temporary invert structure of the primary support skeleton node structure shown; Figure 7 for Figure 4 AA section view; Figure 8 for Figure 4 Schematic diagram of the first embedded plate of the primary support guide hole structure of the primary support skeleton node structure shown in FIG. As another specific implementation, as Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the primary support guide tunnel structure further includes a first embedded plate 120, the back side of the first embedded plate 120 is welded and fixed to the outer sides of the two main reinforcements in front of the primary support guide tunnel structure;

[0056] like Figure 4 , Figure 5 and Figure 6 As shown, the temporary inverted arch structure further includes an L-shaped angle steel 220, and the outer side of the long arm of the L-shaped angle steel 220 is welded and fixed to the outer sides of two adjacent main bars of the temporary inverted arch structure; the welded fixing part includes the first embedded plate and the L-shaped angle steel; that is, the welded fixing part of the primary support guide tunnel structure is the first embedded plate, and the welded fixing part of the temporary inverted arch structure is the L-shaped angle steel;

[0057] Wherein, the outer side of the short arm of the L-shaped angle steel is welded and fixed to the front side of the first embedded plate.

[0058] The first embedded plate is welded and fixed to the outside of the two main bars in front of the primary support guide tunnel structure, and the L-shaped angle steel is welded and fixed to the outside of the two adjacent main bars of the temporary invert structure, and then the first embedded plate and the L-shaped angle steel are welded and fixed. The welding fixing part includes the first embedded plate and the L-shaped angle steel, and the first embedded plate and the L-shaped angle steel increase the fixing area of ​​the welding fixing, so that the node structure of the primary support skeleton is more stable.

[0059] Specifically, the length of the weld seams between the first embedded plate and the two main bars of the primary support guide tunnel structure, the weld between the outer side of the long arm of the L-shaped angle steel and the two adjacent main bars of the temporary invert structure, and the weld between the outer side of the short arm of the L-shaped angle steel and the front face of the first embedded plate are full welds. In this way, the primary support guide tunnel structure and the temporary invert structure are firmly fixed.

[0060] Specifically, the two main reinforcements behind the vertical bend and the primary support tunnel structure are welded on both sides, and the weld length is full welded. In this way, the primary support tunnel structure and the temporary invert structure are firmly fixed.

[0061] Specifically, Figure 4 , Figure 5 , Figure 6 and Figure 8 The primary support guide tunnel structure further includes three U-shaped anchor bars 110, each of which is welded and fixed to the back of the first embedded plate 120 in parallel and at intervals, the bottom end of the U-shaped anchor bar is welded and fixed to the back of the first embedded plate, and the two arms of the U-shaped anchor bar 110 extend into the space surrounded by the main bars of the primary support guide tunnel structure;

[0062] Wherein, the welding fixing part also includes the U-shaped anchor bar, Figure 8 The dotted line frame in the middle shows the position where the U-shaped anchor bar is welded and fixed to the first embedded plate, and the dotted line frames on both sides show the position where the L-shaped angle steel is fixed to the first embedded plate.

[0063] In the initial support skeleton node structure of the dark-bored tunnel, through the subsequent concrete pouring step, the three U-shaped anchor bars are riveted to the initial support guide tunnel structure through concrete at the positions where the three U-shaped anchor bars are located, thereby making the initial support skeleton node structure of the dark-bored tunnel more stable.

[0064] The primary support skeleton node structure with the first embedded plate and L-shaped angle steel is suitable for construction environments with a small cavern width.

[0065] Embodiment 3

[0066] Fig. 9 A schematic diagram of a primary support skeleton node structure of a dark-excavated tunnel according to another embodiment of the present application; Fig.10 for Fig. 9The schematic diagram of the primary support skeleton node structure before welding and fixation is shown; Fig.11 for Fig. 9 BB cross-sectional view; Fig.12 for Fig. 9 The schematic diagram of the second embedded plate of the primary support guide hole structure of the primary support skeleton node structure shown in FIG. The primary support skeleton node structure of the embodiment of the present application, based on the embodiment 1, also has the following technical features:

[0067] In implementation, such as Fig. 9 , Fig.10 and Fig.11 As shown, the primary support guide tunnel structure 100 is a primary support guide tunnel structure 100 of a grid structure, and the temporary invert structure 200 is a temporary invert structure of I-shaped steel;

[0068] The grid structure includes four main ribs and multiple groups of connecting ribs, each group of connecting ribs includes four connecting ribs; wherein the four main ribs are located at four vertices of the same rectangular frame, and the four connecting ribs of each group of connecting ribs are respectively connected between two adjacent main ribs to form a rectangular frame.

[0069] The primary support guide tunnel structure adopts a structurally stable grid structure, which makes the structure of the entire primary support skeleton node structure stable.

[0070] Specifically, the rectangular frames formed by the groups of connecting ribs are arranged at intervals along the length direction of the main ribs.

[0071] In this way, each group of connecting ribs and the main ribs are welded and fixed together to form a grid structure. The groups of connecting ribs arranged at intervals along the length direction of the main ribs make the entire grid structure more stable.

[0072] Specifically, Fig.10 As shown, the grid structure further includes a reinforcing rib, and both ends of the reinforcing rib are respectively welded and fixed between two oppositely arranged main ribs to enhance the stability of the grid structure;

[0073] Among them, the reinforcing ribs of the primary support guide tunnel structure are "X"-shaped reinforcing ribs 332.

[0074] The presence of reinforcement ribs makes the entire grille structure more stable.

[0075] Specifically, Fig.10 and Fig.11 As shown, the primary support guide tunnel structure further includes a second embedded plate 130, the back side of which is welded and fixed to the outer sides of the two main reinforcements in front of the primary support guide tunnel structure;

[0076] like Fig.10 and Fig.11As shown, the temporary inverted arch structure further includes a welding steel plate 230, the front side of which is welded and fixed to the temporary inverted arch structure of the I-shaped steel; the welding fixing part includes the second embedded plate and the welding steel plate; that is, the welding fixing part of the primary support guide tunnel structure is the second embedded plate, and the welding fixing part of the temporary inverted arch structure is the welding steel plate;

[0077] Wherein, the front side of the second embedded plate is welded and fixed to the back side of the welding steel plate.

[0078] The second embedded plate is welded and fixed to the outside of the two main bars in front of the primary support guide tunnel structure. The welded steel plate is welded and fixed to the temporary inverted arch structure of the I-shaped steel, and then the second embedded plate and the welded steel plate are welded and fixed. The welding fixing part includes the second embedded plate and the welded steel plate. The second embedded plate and the welded steel plate increase the fixing area of ​​the welding fixation, thereby making the primary support skeleton node structure more stable.

[0079] Specifically, the welding lengths of the second embedded plate and the two main bars of the primary support guide tunnel structure, the welding between the welded steel plate and the temporary invert structure of the I-shaped steel, and the welding between the second embedded plate and the welded steel plate are full welds. In this way, the primary support guide tunnel structure and the temporary invert structure are firmly fixed.

[0080] Specifically, Fig. 9 , Fig.10 and Fig.12 As shown, the primary support guide tunnel structure further includes three U-shaped anchor bars, each of which is welded and fixed to the back of the second embedded plate in a parallel manner, and the bottom end of the U-shaped anchor bar is welded and fixed to the back of the second embedded plate, and the two arms of the U-shaped anchor bar extend into the space surrounded by the main bars of the primary support guide tunnel structure;

[0081] Wherein, the welding fixing part also includes the U-shaped anchor bar, Fig.12 The dotted frame shows the position where the U-shaped anchor bar is welded and fixed to the second embedded plate.

[0082] In the initial support skeleton node structure of the dark-bored tunnel, through the subsequent concrete pouring step, the three U-shaped anchor bars are riveted to the initial support guide tunnel structure through concrete at the positions where the three U-shaped anchor bars are located, thereby making the initial support skeleton node structure of the dark-bored tunnel more stable.

[0083] In the description of the present application and its embodiments, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", "height", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0084] In the present application and its embodiments, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0085] In the present application and its embodiments, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0086] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0087] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0088] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A primary support skeleton node structure of a dark excavated tunnel, characterized in that: include: The primary support and guide tunnel structure is set vertically; Temporary inverted arch structure set horizontally; Wherein, any one or both of the primary support guide tunnel structure and the temporary invert arch structure are preset with a welding fixing part, and the primary support guide tunnel structure and the temporary invert arch structure are welded and fixed by the welding fixing part; The primary support guide tunnel structure is a primary support guide tunnel structure of a grid structure, and the temporary invert structure is a temporary invert structure of a grid structure; The grid structure includes four main ribs and multiple groups of connecting ribs, each group of connecting ribs includes four connecting ribs; wherein the four main ribs are located at four vertices of the same rectangular frame, and the four connecting ribs of each group of connecting ribs are respectively connected between two adjacent main ribs to form a rectangular frame; One end of the main reinforcement of each temporary inverted arch structure has a vertical bend, and the vertical bend serves as the welding fixing portion; Each of the vertical bends passes through the two main bars in front of the primary support guide tunnel structure, extends into the primary support guide tunnel structure, and is fixed to the two main bars at the rear of the primary support guide tunnel structure by welding; The grid structure further comprises a reinforcing rib, the two ends of which are respectively welded and fixed between two oppositely arranged main ribs; Wherein, the reinforcement ribs of the temporary invert structure are Z-shaped reinforcement ribs, and the reinforcement ribs of the primary support guide tunnel structure are I-shaped reinforcement ribs; The primary support guide tunnel structure further comprises a first embedded plate, the back side of which is welded and fixed to the outer sides of the two main reinforcements in front of the primary support guide tunnel structure; The temporary inverted arch structure further comprises an L-shaped angle steel, the outer side of the long arm of the L-shaped angle steel is welded and fixed to the outer sides of two adjacent main reinforcements of the temporary inverted arch structure; the welded fixing part comprises the first embedded plate and the L-shaped angle steel; Wherein, the outer side of the short arm of the L-shaped angle steel is welded and fixed to the front side of the first embedded plate; The primary support guide tunnel structure further includes three U-shaped anchor bars, each of which is welded and fixed to the back of the first embedded plate in a parallel manner, and the bottom end of the U-shaped anchor bar is welded and fixed to the back of the first embedded plate, and two arms of the U-shaped anchor bar extend into the space surrounded by the main bars of the primary support guide tunnel structure; Wherein, the welding fixing part also includes the U-shaped anchor bar; The primary support guide tunnel structure further includes a second embedded plate, the front surface of which is welded and fixed to the outer side of the main reinforcement of the temporary invert structure; Wherein, the temporary inverted arch structure also includes a welded steel plate, and the front surface of the welded steel plate is welded and fixed to the temporary inverted arch structure of the I-shaped steel.

2. The node structure according to claim 1, characterized in that: The primary branch guide tunnel structure and the temporary invert structure are welded and fixed to form a T-shaped node structure.

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