Special ring hybrid fiber reinforced ultra high performance concrete segment structure and prefabricated opening segment

Abstract

The application discloses a prefabricated opening pipe segment of special ring hybrid fiber reinforced ultra-high performance concrete and relates to the technical field of shield construction.The prefabricated opening pipe segment comprises a pipe segment block, a ring beam part is arranged along the edge of a notch of the pipe segment block, a first steel reinforcement framework is arranged in the pipe segment block, and a second steel reinforcement framework is arranged in the ring beam part.The first steel reinforcement framework comprises a plurality of first longitudinal reinforcements, the first longitudinal reinforcements are arranged along the length direction and the width direction of the pipe segment block at intervals, and the first longitudinal reinforcements are connected through stirrups.The second steel reinforcement framework comprises a plurality of second longitudinal reinforcements and a plurality of transverse reinforcements, the second longitudinal reinforcements are connected perpendicularly to the transverse reinforcements, the second longitudinal reinforcements are arranged along the length direction and the width direction of the ring beam part at intervals, the transverse reinforcements are arranged along the height direction of the ring beam part at intervals, the second longitudinal reinforcements are connected through stirrups, the transverse reinforcements are connected through stirrups, and the first longitudinal reinforcements and the second longitudinal reinforcements are connected through stirrups.The prefabricated opening pipe segment can form an opening directly through on-site assembly, and convenience is improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) construction technology, specifically to a special ring-hybrid fiber-reinforced ultra-high performance concrete segment structure and prefabricated perforated segments. Background Technology

[0002] In intercity and subway engineering construction, tunnel construction generally employs shield tunneling technology. The cost of tunnel lining segments often accounts for 40%-50% of the total tunnel project cost, primarily due to the manufacturing and construction expenses of the tunnel segments. As the permanent support structure of intercity and subway tunnels, tunnel segments play a decisive role in the quality of the tunnel project. Since the construction of tunnels using the shield method in 1818, shield tunneling technology has advanced rapidly, while the development of segment materials has been relatively slow. This is partly due to the relatively slower development of structural materials, and partly reflects the high requirements for segment materials in shield tunnels. Segments are the main assembly components in tunnel construction, forming the innermost barrier of the tunnel, and bearing the responsibility of resisting soil pressure, groundwater pressure, and certain special loads. The quality of the tunnel segments directly affects the overall quality and safety of the tunnel, influencing its waterproofing and durability. The tunnel segments at the top of the tunnel bear the greatest pressure inside the tunnel. Under the long-term erosion of the underground environment, the ring beam between the top and side segments is prone to loosening, resulting in significant settlement or displacement of the top segments, which endangers the overall quality and safety of the tunnel. In addition, water seepage is also prone to occur at the ring beam between the top and side segments, which greatly reduces the service life of the segments.

[0003] Currently, steel segment rings have been widely used both domestically and internationally. However, steel segments require high processing precision, are expensive, and are difficult to treat for corrosion and rust prevention, affecting structural durability. Concrete-cut segments are increasingly used. This method is relatively inexpensive, uses on-site cutting to create openings, has no special requirements for segment assembly precision, and offers flexible opening options. However, temporary supports need to be erected during segment cutting, making it relatively less convenient. Summary of the Invention

[0004] To address the inconvenience of on-site segment cutting in existing technologies, this invention provides a segment structure of special ring-hybrid fiber-reinforced ultra-high performance concrete and prefabricated perforated segments, which can be directly assembled on-site to form openings, thus improving convenience.

[0005] To achieve the above objectives, the present invention can adopt the following technical solutions:

[0006] In a first aspect, the present invention provides a segment structure of a special ring-hybrid fiber-reinforced ultra-high performance concrete, comprising:

[0007] A segment block has a notch and a ring beam is provided along the edge of the notch. A first steel reinforcement cage is provided inside the segment block, and a second steel reinforcement cage is provided inside the ring beam. The first steel reinforcement cage includes a plurality of first longitudinal bars, which are spaced apart along the length and width directions of the segment block and are connected by stirrups. The second steel reinforcement cage includes a plurality of second longitudinal bars and a plurality of transverse bars. The second longitudinal bars are perpendicularly connected to the transverse bars. The plurality of second longitudinal bars are spaced apart along the length and width directions of the ring beam, and the plurality of transverse bars are spaced apart along the height direction of the ring beam. The plurality of second longitudinal bars are connected by stirrups, and the plurality of transverse bars are connected by stirrups. The first longitudinal bars and the second longitudinal bars are connected by stirrups.

[0008] The segment structure of the special ring-hybrid fiber-reinforced ultra-high performance concrete described above further includes a haunch bar, which is disposed within the first reinforcing steel skeleton. The two ends of the haunch bar are fixedly disposed near the two outermost first longitudinal bars of the first reinforcing steel skeleton, and the middle part of the haunch bar is disposed near the notch.

[0009] In the aforementioned special ring-hybrid fiber-reinforced ultra-high performance concrete segment structure, hand holes are further provided on the surface of the segment block.

[0010] As described above, the special ring-hybrid fiber-reinforced ultra-high performance concrete segment structure is further further described, wherein the segment blocks are made of ultra-high performance concrete, which includes 1.75%~2.25% steel fiber and 0.25%~0.75% PP fiber in volumetric parameters.

[0011] As mentioned above, the segment structure of the special ring-hybrid fiber-reinforced ultra-high performance concrete is further characterized by the overall arc-shaped sheet structure of the segment block.

[0012] As described above, in the special ring-hybrid fiber-reinforced ultra-high performance concrete segment structure, the ring beam portion is further L-shaped.

[0013] Secondly, the present invention provides a prefabricated perforated segment of special ring-hybrid fiber-reinforced ultra-high performance concrete, which includes the above-mentioned segment structure, wherein four of the segment blocks are spliced ​​together to form a hole.

[0014] As described above, the precast perforated segments of special ring-hybrid fiber-reinforced ultra-high performance concrete are further provided with first bolt holes on the side of the segment blocks. The four segments are spliced ​​and fixed by bolts and the first bolt holes. The second longitudinal reinforcement between two adjacent ring beams is connected to each other, and the transverse reinforcement between two adjacent ring beams is connected to each other.

[0015] The precast perforated segment of the special ring-hybrid fiber-reinforced ultra-high performance concrete described above further includes several steel plates. The side of the ring beam near the notch is provided with a second bolt hole. The several steel plates are fixedly installed at the opening by bolts and the second bolt holes. The several steel plates are arranged in a crisscross pattern.

[0016] Compared with the prior art, the advantages of this invention are as follows:

[0017] 1. The pipe segment blocks of the present invention can be directly assembled on site to form an opening, which improves convenience;

[0018] 2. The pipe segments of this invention are made of ultra-high performance concrete, which has unique properties such as high compressive strength, high density, good durability and excellent tensile strength. At the same time, it also solves the problems of high cost and easy corrosion of traditional steel structures. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the tube segment block in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the first and second steel reinforcement cages in an embodiment of the present invention;

[0022] Figure 3 This is a front view of the first and second reinforcing bar cages in an embodiment of the present invention;

[0023] Figure 4 This is a top view of the first and second reinforcing bar cages in an embodiment of the present invention;

[0024] Figure 5 This is a partial structural schematic diagram of the prefabricated perforated segment in an embodiment of the present invention;

[0025] In the diagram, 1. Segment block; 2. Notch; 3. Ring beam section; 4. First reinforcing cage; 5. Second reinforcing cage; 6. First longitudinal bar; 7. Second longitudinal bar; 8. Transverse bar; 9. Stirrup; 10. Armpit bar; 11. First bolt hole; 12. Second bolt hole; 13. Opening; 14. Steel plate. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] Example:

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, in the embodiments of this invention are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or means is not necessarily limited to those steps or means explicitly listed, but may include other steps or means not explicitly listed or inherent to such processes, methods, products, or devices.

[0029] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0030] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] In a first aspect, the present invention provides a segment structure of special ring-hybrid fiber-reinforced ultra-high performance concrete, comprising a segment block 1 having a notch 2 and a ring beam portion 3 arranged along the edge of the notch 2, a first steel reinforcement skeleton 4 arranged inside the segment block 1, and a second steel reinforcement skeleton 5 arranged inside the ring beam portion 3. The first steel reinforcement skeleton 4 includes a plurality of first longitudinal bars 6, which are spaced apart along the length and width directions of the segment block 1 and are connected by stirrups 9. The second steel reinforcement skeleton 5 includes a plurality of second longitudinal bars 7 and a plurality of transverse bars 8, which are perpendicularly connected to the transverse bars 8. The plurality of second longitudinal bars 7 are spaced apart along the length and width directions of the ring beam portion 3, and the plurality of transverse bars 8 are spaced apart along the height direction of the ring beam portion 3. The plurality of second longitudinal bars 7 are connected by stirrups 9, and the plurality of transverse bars 8 are connected by stirrups 9. The first longitudinal bars 6 and the second longitudinal bars 7 are connected by stirrups 9.

[0033] Specifically, a notch 2 is made at one corner of the segment block 1 and a ring beam 3 is provided along the edge. The segment block 1 and the ring beam 3 are respectively provided with a first steel reinforcement cage 4 and a second steel reinforcement cage 5. The longitudinal and transverse bars in the two cages are arranged at intervals in a specific direction and connected by stirrups 8. In addition, the longitudinal bars in the two cages are also connected by stirrups 8. This enhances the overall strength and rigidity of the segment block 1 and the ring beam 3, which can effectively resist various pressures and improve the stability of the structure.

[0034] As an optional implementation, in some embodiments, a shank reinforcement 10 is also included. The shank reinforcement 10 is disposed within the first reinforcing steel cage 4, with its two ends fixed close to the two outermost first longitudinal reinforcements 6 of the first reinforcing steel cage 4, and its middle portion positioned near the notch 2. The fact that the two ends of the shank reinforcement 10 are fixed close to the outermost first longitudinal reinforcements 6 of the first reinforcing steel cage 4 effectively transfers the stress around the notch 2 to the entire first reinforcing steel cage 4, enhancing the overall structural integrity. The middle portion positioned near the notch 2 specifically strengthens the mechanical properties of this weak point, improving its crack and shear resistance, reducing the risk of damage caused by stress concentration due to the notch 2, and ensuring the safety and reliability of the segment structure under various pressure environments.

[0035] As an optional implementation, in some embodiments, hand holes (not shown in the figure) are provided on the surface of the segment block 1. Providing hand holes on the surface of the segment block 1 greatly facilitates manual handling and adjustment of the segment block 1 by construction personnel during installation, maintenance, and other operations, reducing construction difficulty and labor intensity.

[0036] As an optional implementation, in some embodiments, the segment block 1 is made of ultra-high performance concrete, which includes 1.75%~2.25% steel fiber and 0.25%~0.75% PP fiber in a volumetric parameter ratio. Specifically, the segment block 1 is made of ultra-high performance concrete containing a specific volumetric parameter ratio of steel fiber (1.75%~2.25%) and PP fiber (0.25%~0.75%). The steel fiber effectively inhibits the propagation of internal cracks in the concrete, greatly improving the tensile, flexural, and impact resistance of the segment block; the PP fiber improves the early crack resistance of the concrete and reduces the generation of plastic shrinkage cracks. The synergistic effect of these two components gives the segment block 1 higher strength, toughness, and durability, enabling it to better adapt to complex and changing engineering environments, effectively extending the service life of the segment structure, and reducing later maintenance costs.

[0037] As an optional implementation, in some embodiments, the segment block 1 has an overall arc-shaped sheet structure. This arc-shaped sheet structure can conform to the inner wall shape of circular or near-circular structures such as tunnels, allowing for a tight fit during assembly to form a continuous, smooth, and stable support system that effectively withstands pressure from surrounding soil or water. Simultaneously, the arc-shaped structure can more evenly distribute stress, avoiding localized damage caused by stress concentration, enhancing the structural strength and overall stability of the segment block 1, and ensuring the safety and reliability of the engineering structure.

[0038] As an optional implementation, in some embodiments, the ring beam 3 is L-shaped. The L-shaped structure has high overall stiffness, which can improve the deformation resistance of the segment structure at the notch 2, ensuring the overall stability and safety of the structure.

[0039] Secondly, the present invention provides a prefabricated perforated segment of special ring-hybrid fiber-reinforced ultra-high performance concrete, which includes the above-mentioned segment structure, wherein four segment blocks 1 are spliced ​​together so that the gap 2 forms the opening 13.

[0040] Specifically, the prefabricated perforated segment design, which uses four of the aforementioned segment blocks 1 spliced ​​together to form openings 13 through gaps 2, utilizes the high strength and toughness advantages of the segment block 1's special structure to ensure the overall load-bearing capacity of the segment. Furthermore, the splicing method allows for precise control of the opening size and location, meeting the specific opening requirements of projects such as pipeline laying and ventilation. With proper design, the splicing structure ensures uniform stress distribution around the opening, reducing stress concentration and improving the stability and safety of the perforated segment under various pressure environments. Additionally, it allows for direct on-site assembly without the need for temporary supports, enhancing convenience.

[0041] As an optional implementation, in some embodiments, the side of the segment block 1 is provided with a first bolt hole 11. The four segment blocks 1 are spliced ​​and fixed by bolts engaging with the first bolt holes 11. The second longitudinal reinforcement 7 between two adjacent ring beams 3 is interconnected, and the transverse reinforcement 8 between two adjacent ring beams 3 is interconnected. The bolt connection is convenient to install and simple to operate, significantly improving construction efficiency. It is also robust and reliable, effectively transmitting tensile, compressive, and shear forces. Simultaneously, the second longitudinal reinforcement 7 and transverse reinforcement 8 between adjacent ring beams 3 are fixed by welding or lap splicing, ensuring that the four segment blocks 1 are tightly integrated into a whole, enhancing the integrity and stability of the segment structure, and enabling it to better withstand various loads generated by the surrounding environment.

[0042] As an optional implementation, in some embodiments, a plurality of steel plates 14 are further included. A second bolt hole 12 is provided on the side of the ring beam 3 near the notch 2. The plurality of steel plates 14 are fixedly installed at the opening 13 by bolts engaging with the second bolt holes 12, and the steel plates 14 are arranged in a crisscross pattern. Specifically, after assembly and before use, the crisscrossing steel plates 14 are installed at the opening 13 by bolts engaging with the second bolt holes 12. This crisscrossing layout effectively disperses the concentrated stress generated around the opening 13 due to the opening, transferring the stress to a wider area and enhancing the load-bearing capacity of the opening structure. The high strength of the steel plates 14 improves the local stiffness and deformation resistance of the opening. Furthermore, the bolted connection facilitates the installation and disassembly of the steel plates 14; in subsequent use, only the steel plates 14 need to be disassembled, which is quite convenient.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A segment structure of a special ring-hybrid fiber-reinforced ultra-high performance concrete, characterized in that, include: A segment block has a notch and a ring beam is provided along the edge of the notch. A first steel reinforcement cage is provided inside the segment block, and a second steel reinforcement cage is provided inside the ring beam. The first steel reinforcement cage includes a plurality of first longitudinal bars, which are spaced apart along the length and width directions of the segment block and are connected by stirrups. The second steel reinforcement cage includes a plurality of second longitudinal bars and a plurality of transverse bars. The second longitudinal bars are perpendicularly connected to the transverse bars. The plurality of second longitudinal bars are spaced apart along the length and width directions of the ring beam, and the plurality of transverse bars are spaced apart along the height direction of the ring beam. The plurality of second longitudinal bars are connected by stirrups, and the plurality of transverse bars are connected by stirrups. The first longitudinal bars and the second longitudinal bars are connected by stirrups.

2. The segment structure of the special ring-hybrid fiber-reinforced ultra-high performance concrete according to claim 1, characterized in that, It also includes axillary reinforcement, which is disposed within the first steel reinforcement cage. The two ends of the axillary reinforcement are fixedly disposed near the two outermost first longitudinal reinforcements of the first steel reinforcement cage, and the middle part of the axillary reinforcement is disposed near the notch.

3. The segment structure of the special ring-hybrid fiber-reinforced ultra-high performance concrete according to claim 1, characterized in that, The surface of the tube segment is provided with a hand hole.

4. The segment structure of the special ring-hybrid fiber-reinforced ultra-high performance concrete according to claim 1, characterized in that, The pipe segments are made of ultra-high performance concrete, which includes 1.75% to 2.25% steel fiber and 0.25% to 0.75% PP fiber in volumetric parameters.

5. The segment structure of the special ring-hybrid fiber-reinforced ultra-high performance concrete according to claim 1, characterized in that, The entire tube segment has an arc-shaped sheet structure.

6. The segment structure of the special ring-hybrid fiber-reinforced ultra-high performance concrete according to claim 1, characterized in that, The ring beam is L-shaped.

7. A precast perforated segment of a special ring-hybrid fiber-reinforced ultra-high performance concrete, characterized in that, The structure includes the segment structure according to any one of claims 1 to 6, wherein four segments are spliced ​​together to form an opening.

8. The precast perforated segment of special ring-hybrid fiber-reinforced ultra-high performance concrete according to claim 7, characterized in that, The side of the tube segment is provided with a first bolt hole. The four tube segments are spliced ​​and fixed by bolts and the first bolt holes. The second longitudinal ribs between two adjacent ring beams are connected to each other, and the transverse ribs between two adjacent ring beams are connected to each other.

9. The precast perforated segment of special ring-hybrid fiber-reinforced ultra-high performance concrete according to claim 7, characterized in that, It also includes several steel plates. The side of the ring beam near the notch has a second bolt hole. The several steel plates are fixed at the opening by bolts and the second bolt holes. The several steel plates are arranged in a crisscross pattern.

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