Main hole special ring setting method suitable for shield transverse connection channel connector

Abstract

The invention discloses a main hole special ring setting method suitable for a shield transverse connection channel interface, which comprises the following steps of: carrying out structural partition on a main hole special ring at the connection channel interface, and dividing the main hole special ring into a common pipe sheet area, a freezing hole opening area and a connection channel opening area; for the opening area of the connecting channel, the duct piece of the opening area of the connecting channel is divided into a breaking part and a non-breaking part, the non-breaking part is of a steel plate-concrete combined structure, and the breaking part is of a fiber concrete structure; and for the freezing hole opening area, steel fiber concrete pipe pieces are adopted. By means of the method, the problem that the bearing capacity of the duct piece is weakened due to freezing hole opening and the problems that the construction efficiency is low and the bearing capacity is insufficient when the main hole duct piece is broken are solved.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering construction, and in particular to a method for setting a special ring in a main hole suitable for an interface of a shield tunnel's transverse communication channel. Background Art

[0002] With the rapid development of urban rail transit, large underground spaces, and urban tunnels, shield tunneling has become widely used as the mainstream underground passage construction method. To enhance tunnel safety redundancy and emergency evacuation capabilities, transverse connecting passages are often required between twin shield tunnels. The safe and efficient construction of transverse connecting passages has become a crucial component in ensuring the safe operation of transportation systems such as subways and urban underground roads.

[0003] The transverse connecting channel, also known as the transverse channel, is an important evacuation facility for personnel to evacuate from one tunnel space to the adjacent tunnel space in an emergency. Transverse connecting channels should be set up between double-hole subway shield tunnels and double-hole underground road shield tunnels. There are two main methods for setting up transverse connecting channels: mining method and mechanical method. Among them, the mining method is the most common, and the mining method often requires the freezing method to reinforce the stratum when constructing the connecting channel. When constructing the connecting channel under the mining + freezing method, the main tunnel segments are mostly ordinary reinforced concrete segments. It is necessary to open freezing holes on the segments and break the segments at the interface of the transverse channel. The relevant technology has the following problems:

[0004] In related technologies, several freezing holes need to be drilled on the pipe segments before freezing operations. Depending on the boundary conditions, one or two rings of freezing holes are generally arranged in an annular direction. The spacing between the freezing holes is generally about 0.8-1.2m, and the diameter of the freezing holes is generally about 110-140mm. The distribution of freezing holes can be referred to below. Figure 1 Actual case studies. Clearly, the dense distribution of freezing holes, their large openings, and the randomness of their placement during construction mean that even when holes are carefully selected to avoid the main reinforcement of the segments, damage to the steel reinforcement within the segments is inevitable. Statistics show that due to the dense distribution of holes, approximately 20%-50% of the steel reinforcement within the segments will be severed, significantly reducing the bearing capacity of the segments in the opening area and creating safety hazards.

[0005] In the related art, rectangular openings are usually formed at the interface between the main tunnel and the transverse channel by drilling through the pipe segments with a water drill. Due to the large diameter and dense distribution of the stressed steel bars in the segments, it takes a long time for the water drill to cut through the steel bars. Each drilling requires more than 2 hours, resulting in low construction efficiency. In addition, since the steel bars are cut off over a large area, the bearing capacity of the remaining segments is greatly reduced. Even if more steel bars are configured in the non-broken areas, the problem of insufficient bearing capacity cannot be effectively solved, posing a safety hazard at the interface of the transverse channel. In addition, some cases use combined steel segments to form rectangular openings. The steel segments need to be re-molded and produced, which is expensive and difficult to hoist and install.

[0006] There are two major technical problems in the relevant technology: one is that the stress-bearing performance of the pipe segments is severely weakened due to the dense opening of freezing holes, posing a structural safety hazard; the other is that when ordinary reinforced concrete pipe segments are removed at the interface of the connecting channel, the stress-bearing steel bars are densely distributed and cut off in large numbers, so the construction speed is slow and the bearing capacity of the remaining pipe segments is difficult to effectively guarantee.

[0007] In summary, the method of setting special rings in the main hole at the interface position of the connecting channel in the relevant technology has the following problems: the weakening of the bearing capacity of the pipe segment due to the opening of the freezing hole and the low construction efficiency and insufficient bearing capacity of the pipe segment when the main hole at the cross channel is broken. Summary of the Invention

[0008] The present invention aims to provide a method for setting special rings in the main hole at the interface of the shield's transverse connecting channel, which can solve the problems of weakening the bearing capacity of the pipe segments due to the opening of freezing holes in the method for setting special rings in the main hole at the interface of the connecting channel in related technologies, and the problems of low construction efficiency and insufficient bearing capacity of the pipe segments when breaking the main hole at the transverse channel.

[0009] According to one aspect of the present invention, a method for setting a main hole special ring suitable for the interface of a shield's transverse connecting channel is provided, comprising: structurally zoning the main hole special ring at the connecting channel interface into a common pipe segment area, a freezing hole opening area, and a connecting channel opening area; for the connecting channel opening area, the pipe segments in the connecting channel opening area are divided into a broken part and a non-broken part, wherein the non-broken part adopts a steel plate-concrete composite structure, and the broken part adopts a fiber concrete structure; for the freezing hole opening area, steel fiber concrete pipe segments are adopted.

[0010] Preferably, the steel plate-concrete composite structure of the non-broken part includes: a steel plate skeleton and a steel shell, wherein the steel plate skeleton includes: a web, a back plate, annular ribs and longitudinal ribs, and the web, the back plate, the annular ribs and the longitudinal ribs are all provided with bolts, and the interior of the steel plate-concrete composite structure is filled with fiber concrete of a first preset grade.

[0011] Preferably, the steel plates of the web, back plate, annular ribs and longitudinal ribs are 20 mm to 30 mm thick and are fixed by the studs, with the spacing of the studs being 200 mm.

[0012] Preferably, the fiber concrete structure of the removal zone is made of a fiber material including glass fiber or organic fiber, and the interior of the fiber concrete structure is filled with concrete of a second preset grade.

[0013] Preferably, the concrete grade corresponding to the concrete used in the broken area is lower than the concrete grade corresponding to the concrete used in the ordinary pipe segment area.

[0014] Preferably, the second preset grade of concrete is concrete with a grade of C40 or concrete with a grade lower than C40.

[0015] Preferably, the freezing hole opening area adopts steel fiber concrete segments. According to the bearing capacity requirements, a preset amount of steel bars can be arranged inside the steel fiber concrete segments to form sparse reinforcement-fiber composite concrete segments.

[0016] Preferably, the steel fiber content of the steel fiber concrete segment is 30 to 60 kg / m3.

[0017] Preferably, the pipe segments in the freezing hole opening area and the pipe segments in the communication channel opening area are both produced using standard molds.

[0018] The present invention provides a method for setting a special ring of the main hole at the interface of the shield horizontal connecting channel, comprising: structurally zoning the special ring of the main hole at the connecting channel interface into a common pipe segment area, a freezing hole opening area and a connecting channel opening area; for the connecting channel opening area, the pipe segments in the connecting channel opening area are divided into a broken part and a non-broken part, wherein the non-broken part adopts a steel plate-concrete composite structure, and the broken part adopts a fiber concrete structure; for the freezing hole opening area, a steel fiber concrete pipe segment is adopted, thereby solving the problem of weakening the pipe segment bearing capacity due to the freezing hole opening in the method for setting the special ring of the main hole at the connecting channel interface in the related art and the problems of low construction efficiency and insufficient pipe segment bearing capacity when the main hole at the horizontal channel is broken, thereby improving the safety of underground construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 It is a freezing hole opening step diagram according to the relevant technology;

[0021] Figure 2 This is a special ring elevation view of the communication channel interface position when a single row of freezing holes is set according to an embodiment of the present invention;

[0022] Figure 3 This is a special ring elevation view of the communication channel interface position when double rows of freezing holes are set according to an embodiment of the present invention;

[0023] Figure 43. This is a front view of the inner arc surface of the segment in the opening area of ​​the communication channel according to an embodiment of the present invention;

[0024] Figure 5 3. This is a front view of the outer arc surface of the segment in the opening area of ​​the communication channel according to an embodiment of the present invention;

[0025] Figure 6 is a first cross-sectional view of a main hole segment in a communication channel opening area according to an embodiment of the present invention;

[0026] Figure 7 3. It is a second cross-sectional view of the main hole segment of the communication channel opening area according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] This embodiment provides a method for setting a main hole special ring at the interface of a shield's transverse connecting channel. The method may include: structurally partitioning the main hole special ring at the connecting channel interface into a common pipe segment area, a freezing hole opening area, and a connecting channel opening area; for the connecting channel opening area, the pipe segments in the connecting channel opening area are divided into a broken part and a non-broken part, wherein the non-broken part adopts a steel plate-concrete composite structure, and the broken part adopts a fiber concrete structure 5; for the freezing hole opening area, a steel fiber concrete pipe segment 2 is adopted.

[0029] This embodiment rationally divides the main tunnel's special ring into a common segment area, a freezing hole opening area, and a connecting channel opening area, enabling differentiated configurations based on the stress characteristics and construction requirements of different locations. In the connecting channel opening area, a steel plate-concrete composite structure combined with a fiber-reinforced concrete structure 5 is employed to enhance the structural bearing capacity of the unbroken area and simplify construction operations in the broken area. The freezing hole opening area utilizes steel fiber reinforced concrete, effectively improving the stress adaptability of the area affected by the hole interference and addressing the issue of weakened bearing capacity. This overall approach improves structural performance, construction efficiency, and safety.

[0030] Preferably, the steel plate-concrete composite structure of the non-broken part includes: a steel plate frame and a steel shell, wherein the steel plate frame includes: a web, a back plate, annular ribs and longitudinal ribs, and the web, the back plate, the annular ribs and the longitudinal ribs are all provided with bolts, and the interior of the steel plate-concrete composite structure is filled with fiber concrete of a first preset grade.

[0031] This preferred embodiment forms a stable steel skeleton frame by arranging webs, back plates and longitudinal and transverse ribs, and further combines evenly distributed bolts to enhance the bonding strength between the steel plate and the concrete; high-grade fiber concrete is filled inside the skeleton to enhance the comprehensive compression, shear and bending resistance of the structure, significantly improve the mechanical properties of the non-destruction area, while also taking into account the operability and stability of the construction.

[0032] Preferably, the steel plates of the web, back plate, annular ribs and longitudinal ribs are 20 mm to 30 mm thick and are fixed by the studs, with the spacing of the studs being 200 mm.

[0033] During implementation, the structural stiffness and processability were balanced by setting the steel plate thickness within a reasonable range of 20mm to 30mm; the studs set at 200mm intervals ensured effective anchoring and overall coordinated force between the steel plate and concrete, effectively preventing component slippage, peeling or cracking, and significantly improving structural stability and safety.

[0034] In a preferred embodiment, the fiber concrete structure 5 of the broken area is made of glass fiber or organic fiber, and the interior of the fiber concrete structure 5 is filled with concrete of a second preset grade. The second preset concrete grade is C40 or lower. Using low-grade fiber reinforced concrete in the removal area avoids cutting rebar during segment removal, reducing the difficulty and making the removal process faster and safer. This is particularly suitable for precise construction requirements at transverse channel openings.

[0035] In one preferred embodiment, the steel fiber reinforced concrete segments used in the freezing hole opening area can be equipped with a preset amount of rebar to meet load-bearing requirements, creating a sparsely reinforced fiber composite concrete segment. Leveraging the advantages of the random, multi-directional distribution of steel fibers and the strong support provided by rebar, this achieves an optimized fusion of material mechanical properties, particularly suited to the complex stress states and crack control requirements of the freezing hole opening area.

[0036] In practice, the steel fiber content of the steel fiber concrete segment is 30 to 60 kg / m3. 3 The crack resistance, impact resistance and deformation performance of concrete can be effectively controlled to adapt to the multi-directional stress requirements of the pipe segment under the influence of freezing hole distribution, while avoiding construction problems such as difficulty in dispersion and poor fluidity caused by excessive fiber.

[0037] Preferably, the segments in the freezing hole opening area and the segments in the connecting channel opening area are both produced using standard molds. In this preferred embodiment, the unified use of standard molds for the production of segments in the freezing hole opening area and the connecting channel opening area effectively reduces the production and transportation costs of non-standard components, improves the dimensional consistency and quality stability of prefabricated parts, and significantly enhances construction efficiency and schedule control.

[0038] For better explanation, the following Figures 2 to 7 Provide detailed explanation.

[0039] This preferred embodiment proposes a method for setting special ring segments in the main tunnel of a transverse communication channel between shield machines constructed using a freezing method. The method comprises:

[0040] The segments of the special ring of the main hole at the interface position of the communication channel are divided into communication channel opening area segments, freezing hole opening area segments and ordinary segments 1.

[0041] The main tunnel segment in the interface area of ​​the communication channel (the segment in the opening area of ​​the communication channel) is divided into a broken portion 32 and a non-broken portion 31. The non-broken portion adopts a steel plate-concrete composite structure, while the broken portion 32 adopts a fiber concrete structure.

[0042] Specifically, the steel plate skeleton in the steel plate-concrete composite structure of the non-removed portion 31 is welded together by a web 41, a back 42, annular ribs 43, and longitudinal ribs 44. Multiple studs 45 are distributed within the steel shell. The steel plate thickness of the web 41 and back 42 can generally be 20mm-30mm, and the web 41 must be avoided at the handhole location. A casting hole must be provided on the back 42 of each independent chamber. After casting, the steel plate is welded to seal it. The edge of the back 42 must be at least 100mm away from the outer arc surface of the segment to facilitate vibration and compaction of the concrete in the chamber at the edge of the segment. The steel plate thickness of the annular ribs 43 and longitudinal ribs 44 is generally 20mm-30mm. The annular ribs 43 are welded to the web 41 and back 42 respectively, and the longitudinal ribs 44 are welded to the annular ribs 43. The edges of the longitudinal ribs 44 are at least 100mm away from the web 41 and back 42 to facilitate the circulation of concrete in each chamber. Studs 45 are provided on the web 41 , the back plate 42 , the annular ribs 43 and the longitudinal ribs 44 , and the spacing between the studs 45 is 200 mm.

[0043] The interior of each cavity of the steel plate-concrete composite structure of the non-broken part 31 is filled with fiber concrete. The fiber material can be glass fiber or organic fiber, and the fiber content is determined according to the material type. For example, the volume ratio of glass fiber can be 1.0-3.0%. The concrete grade is the same as that used for ordinary pipe segments.

[0044] The fiber material of the fiber concrete structure of the broken part 32 can be glass fiber or organic fiber, and concrete with a grade of C40 (according to GB50010-2010 "Code for Design of Concrete Structures", ordinary concrete is divided into fourteen grades, namely: C15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75, C80) or concrete with a lower grade.

[0045] The main tunnel segment in the freezing hole opening area adopts steel fiber concrete segment 2, and the steel fiber content is generally 30-60kg / m 3 According to the bearing capacity requirements, a small amount of steel skeleton can be set in the steel fiber concrete segment to form a sparse reinforcement-fiber composite concrete segment.

[0046] It should be noted that, in the above preferred embodiment, the special ring of the main hole at the interface position of the communication channel is structurally divided into a common pipe segment area, a freezing hole opening area, and a communication channel opening area.

[0047] In practice, the above-mentioned different partitions may have different engineering requirements and stress characteristics, and the material adaptability setting is performed on the main hole segments in different partitions.

[0048] As a preferred embodiment, the segments in the common segment area are the same as the main hole ring segments adjacent to the communication channel opening area.

[0049] As another preferred embodiment, the segments in the freezing hole opening area are made of steel fiber concrete segments. According to the bearing capacity requirements, a small amount of steel bars can be set in the steel fiber concrete segments to form sparse reinforcement-fiber composite concrete segments.

[0050] Preferably, the pipe segment in the opening area of ​​the communication channel is divided into a broken part 32 and a non-broken part 31.

[0051] As a preferred embodiment, the non-broken part 31 adopts a steel plate-concrete composite structure, wherein the steel plate skeleton includes: a steel web and longitudinal and transverse ribs welded together (for example: web 41, back plate 42, annular ribs 43 and longitudinal ribs 44), the steel shell is distributed with bolts 42, and the interior is filled with fiber concrete of a preset grade, such as high-grade fiber concrete.

[0052] Preferably, the broken portion 32 may be made of a fiber concrete structure, the fiber material may be glass fiber or organic fiber, and concrete with a label of C40 or below may be used.

[0053] During the implementation process, the pipe segments in the opening area of ​​the connecting channel and the pipe segments in the opening area of ​​the freezing hole are all produced using ordinary reinforced concrete pipe segment molds, which will not increase additional production costs.

[0054] This embodiment solves the problem of weakened segment bearing capacity caused by freezing holes. Unlike reinforced concrete, where the stress-bearing properties depend on the direction of the reinforcement arrangement, fiber-reinforced concrete, due to the random distribution of fibers, is nearly isotropic, making it more suitable for the complex stress states caused by segment openings. By using steel fiber reinforced concrete segments, the problem of weakened segment bearing capacity caused by freezing holes can be solved.

[0055] Secondly, it can solve the problems of low construction efficiency and insufficient load-bearing capacity when breaking the main tunnel segments. By dividing the main tunnel segments into a breaking part and a non-breaking part, and configuring fiber concrete and steel plate concrete composite materials for each, the problems of low construction efficiency and insufficient load-bearing capacity when breaking the main tunnel segments can be solved.

[0056] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for setting a special ring in the main hole at the interface of the shield tunnel's transverse communication channel, characterized in that: include: The special ring of the main hole at the interface of the communication channel is structurally divided into the common pipe segment area, the freezing hole opening area and the communication channel opening area; For the connecting channel opening area, the pipe segments of the connecting channel opening area are divided into a broken part and a non-broken part, wherein the non-broken part adopts a steel plate-concrete composite structure, and the broken part adopts a fiber concrete structure; For the freezing hole opening area, steel fiber concrete segments are used.

2. The method according to claim 1, characterized in that The steel plate-concrete composite structure of the non-broken part includes: a steel plate frame and a steel shell, wherein the steel plate frame includes: a web, a back plate, annular ribs and longitudinal ribs, and the web, the back plate, the annular ribs and the longitudinal ribs are all provided with bolts, and the interior of the steel plate-concrete composite structure is filled with fiber concrete of a first preset grade.

3. The method according to claim 2, characterized in that The steel plates of the web, back plate, annular ribs and longitudinal ribs are 20 mm to 30 mm thick and are fixed by the studs, with the spacing of the studs being 200 mm.

4. The method according to claim 1, characterized in that The fiber concrete structure of the removal zone is made of fiber materials including glass fiber or organic fiber, and the interior of the fiber concrete structure is filled with concrete of a second preset grade.

5. The method according to claim 4, characterized in that: The concrete grade corresponding to the concrete used in the broken area is lower than the concrete grade corresponding to the concrete used in the ordinary pipe segment area.

6. The method according to claim 4, characterized in that: The second preset grade of concrete is the concrete grade of C40 or the concrete grade of lower than C40.

7. The method according to claim 1, characterized in that: The steel fiber concrete segments used in the freezing hole opening area are configured with a preset amount of steel bars inside the steel fiber concrete segments according to the bearing capacity requirements to form sparsely reinforced-fiber composite concrete segments.

8. The method according to any one of claims 1 to 7, characterized in that The steel fiber content of the steel fiber concrete segment is 30 to 60 kg / m3.

9. The method according to any one of claims 1 to 7, characterized in that The pipe segments in the freezing hole opening area and the pipe segments in the communication channel opening area are both produced using standard molds.

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