A steel-concrete combined segment structure and a manufacturing method thereof

Abstract

The application relates to the technical field of rail transit engineering, and discloses a steel-concrete combined segment structure, which comprises tunnel segments and steel segments; one or more tunnel segments are spliced with each other to form a tunnel lining; the steel segments are detachably connected with the tunnel segments; a plurality of connecting bolts are arranged along the edges of the steel segments to connect the tunnel segments and the steel segments; longitudinal hidden beams and annular hidden beams are arranged in the tunnel segments; and the longitudinal hidden beams and the annular hidden beams are arranged along the edges of the tunnel segments close to the steel segments. Compared with the prior art, the application can realize the purpose of internally and non-damagingly removing a subway connecting passage without changing other conventional segments; the longitudinal hidden beams and the annular hidden beams arranged around the steel segments can improve the structural strength of the tunnel segments, avoid the stress concentration problem during the removal of the steel segments, and effectively guarantee the safe removal of the steel segments. The application further provides a manufacturing method of the steel-concrete combined segment, and the method has the advantages of simple and reliable technological process and excellent preparation effect.

Description

Technical Field

[0001] This invention relates to the field of rail transit engineering technology, and in particular to a steel-concrete composite segment structure and its manufacturing method. Background Technology

[0002] With the increasing density of urban rail transit networks, subway tunnel connecting passages have become safety emergency passages and structural connection hubs between tunnel sections. The construction of subway tunnel connecting passages also faces many challenges in terms of construction technology.

[0003] In shield tunnel construction, the main tunnel structure is first assembled using segmented tunnel sections. After the tunnel stabilizes, openings are made in the segments at the designed locations. Finally, the connecting passages are constructed through these openings, forming a complete tunnel system. Current technology often uses manual pneumatic drills to break up the segments during the opening process. However, this method is labor-intensive, time-consuming, and can significantly impact structural stability.

[0004] To address the aforementioned technical issues, patent application CN114737993A discloses an assembly method for recyclable steel-concrete composite segments used for rapid opening of connecting passages. This method combines steel segments with concrete segments, and uses detachable steel segments to achieve prefabrication of the opening area. This allows for the demolition of subway connecting passages from the inside without altering other conventional segments, eliminating the need to break up segments during the entire process.

[0005] However, due to the need for openings at the connecting passage, when the segments are replaced with steel segments, the stress on them and the concrete segments will change, resulting in a redistribution of internal forces. This leads to a concentration of internal forces at the opening location, which is not conducive to the construction of concrete segments, nor to the installation and dismantling of steel segments. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the purpose of this invention is to provide a simple and reliable steel-concrete composite segment structure that can achieve non-destructive opening of connecting passages and avoid the problem of segment installation and dismantling difficulties due to stress concentration.

[0007] Based on this, the present invention provides a steel-concrete composite segment structure, comprising: Tunnel segments, wherein at least one tunnel segment is provided, and one or more tunnel segments are spliced ​​together to form a tunnel lining; Steel pipe segment, wherein at least one steel pipe segment is provided; Connecting bolts are provided along the edges of the tunnel segment and the steel segment for connecting the tunnel segment and the steel segment; The tunnel segment is provided with longitudinal and circumferential hidden beams, which are arranged along the edge of the tunnel segment near the steel pipe segment.

[0008] In some embodiments of this application, the longitudinal hidden beams are provided at intervals and are tied together by stirrups.

[0009] In some embodiments of this application, the circumferential hidden beams are provided at intervals and are tied together as one unit by stirrups.

[0010] In some embodiments of this application, bolt sleeves matching the connecting bolts are pre-embedded inside the tunnel segments.

[0011] In some embodiments of this application, the surface of the tunnel segment is provided with multiple hand holes.

[0012] In some embodiments of this application, the steel pipe segment includes a longitudinal support plate and a circumferential support plate, wherein multiple longitudinal support plates are provided and arranged sequentially along the extending direction of the circumferential support plate. The circumferential support plate consists of multiple pieces arranged sequentially along the extending direction of the longitudinal support plate. The longitudinal support plates and the circumferential support plates are arranged alternately and connected to each other.

[0013] In some embodiments of this application, the longitudinal support plate is welded to the circumferential support plate.

[0014] In some embodiments of this application, the steel pipe segment further includes a bottom panel, which is connected to the longitudinal support plate and the circumferential support plate respectively.

[0015] Another objective of this application is to provide a method for manufacturing a reinforced concrete composite segment structure, comprising the following steps: S1. Set up the segment frame for manufacturing tunnel segments; S2. Longitudinal and circumferential hidden beams are installed within the segment frame; S3. Concrete is poured into the segment frame to form tunnel segments; S4. Fabrication of steel pipe segments; S5. By splicing tunnel segments with steel segments and connecting them with connecting bolts, recyclable reinforced concrete composite segments can be obtained.

[0016] In some embodiments of this application, step S1 further includes: setting a pre-embedded bolt sleeve within the segment frame.

[0017] This invention provides a reinforced concrete composite segment structure, which has the following advantages compared with the prior art: This invention provides a reinforced concrete composite segment structure, which includes tunnel segments and steel segments. At least one tunnel segment is provided to form a tunnel lining structure. Correspondingly, at least one steel segment is provided and detachably connected to the tunnel segment. Connecting bolts are used to connect the tunnel segment and the steel segment, and are evenly arranged along the edge of the steel segment. Furthermore, longitudinal hidden beams and circumferential hidden beams are provided inside the tunnel segment, and the longitudinal hidden beams and circumferential hidden beams are arranged along the edge of the tunnel segment near the steel segment.

[0018] Based on the above structure, this application connects the tunnel segments with detachable steel pipe segments. During tunnel lining assembly, the tunnel segments and steel pipe segments are fixed together in the construction area. After the tunnel lining is completed, the corresponding steel pipe segments can be removed to create openings in the segments. Thus, this application achieves the goal of internal, damage-free dismantling of the subway connecting passage without altering other conventional segments. The installation of the combined segments is no different from assembling normal segments; during dismantling, only connecting bolts are used to separate the tunnel segments from the steel pipe segments, and then the steel pipe segments are removed to create openings on the construction surface, thereby enabling rapid demolition of the subway connecting passage portal. Furthermore, the longitudinal and circumferential hidden beams surrounding the steel pipe segments enhance the structural strength of the tunnel segments, avoiding stress concentration during dismantling and effectively ensuring the safe removal of the steel pipe segments.

[0019] The present invention also provides a method for manufacturing reinforced concrete composite segments, which has the advantages of simple and reliable process and excellent preparation effect. Attached Figure Description

[0020] Figure 1 These are schematic diagrams of the steel-concrete composite tunnel segment structures according to some embodiments of this application; Figure 2 This is a schematic diagram of the interior of a tunnel segment according to some embodiments of this application; Figure 3 This is a schematic diagram of the structure of the longitudinal hidden beam and the annular hidden beam in some embodiments of this application; Figure 4 This is a schematic diagram of the structure of the steel pipe segment in some embodiments of this application; Figure 5 This is a schematic diagram illustrating the equivalent cross-sectional calculation of tunnel segments in some embodiments of this application. Figure 1 ; Figure 6 This is a schematic diagram illustrating the equivalent cross-sectional calculation of tunnel segments in some embodiments of this application. Figure 2 ; Figure 7 This is a schematic diagram illustrating the equivalent cross-sectional calculation of tunnel segments in some embodiments of this application. Figure 3 ; Figure 8 Calculation of the structural bending stiffness of tunnel segments in some embodiments of this application Figure 1 ; Figure 9 Calculation of the structural bending stiffness of tunnel segments in some embodiments of this application Figure 2 .

[0021] In the diagram, 1 is a tunnel segment; 11 is a manhole; 2 is a steel segment; 21 is a longitudinal support plate; 22 is a circumferential support plate; 23 is a bottom panel; 3 is a connecting bolt; 4 is a longitudinal hidden beam; 41 is the first longitudinal reinforcement; 42 is the first transverse reinforcement; 5 is the circumferential hidden beam; 51 is the second longitudinal reinforcement; 52 is the second transverse reinforcement; 6 is a stirrup; 10 is the first segment; 20 is the second segment; 30 is the third segment; 40 is the fourth segment; 50 is the fifth segment; 60 is the sixth segment; 70 is the seventh segment; and 80 is the eighth segment. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] It should be understood that the terms "before," "after," etc., are used in this invention to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, "before" information can also be called "after" information, and "after" information can also be called "before" information, without departing from the scope of this invention.

[0024] Specifically, such as Figures 1 to 4 As shown, this embodiment of the invention provides a reinforced concrete composite segment structure, which includes a tunnel segment 1 and a steel segment 2. There is at least one tunnel segment 1, and one or more tunnel segments 1 are spliced ​​together to form a tunnel lining. Correspondingly, there is at least one steel segment 2. Connecting bolts 3 are used to connect the tunnel segment 1 and the steel segment 2, and they are evenly arranged along the edge of the steel segment 2. Further, the tunnel segment 1 is provided with a longitudinal hidden beam 4 and a circumferential hidden beam 5, and the longitudinal hidden beam 4 and the circumferential hidden beam 5 are arranged along the edge of the tunnel segment 1 near the steel segment 2.

[0025] like Figure 1 As shown, in a specific embodiment of the present invention, tunnel segment 1 includes a first segment 10, a second segment 20, a third segment 30, and a fourth segment 40, and steel segment 2 includes a fifth segment 50, a sixth segment 60, a seventh segment 70, and an eighth segment 80. The first segment 10 is connected to the second segment 20, the third segment 30 is connected to the fourth segment 4 by a longitudinal hidden beam 4, the first segment 10 is connected to the third segment 30, the second segment 20, and the fourth segment 40 by a circumferential hidden beam 5, and the fifth segment 50 is connected to the first segment 10, the sixth segment 60 is connected to the second segment 20, the seventh segment 70 is connected to the third segment 30, and the eighth segment 80 is connected to the fourth segment 40 by connecting bolts 3.

[0026] It should be further explained that the number of tunnel segments 1 and steel segments 2 can be adjusted according to the size of the connecting passage and the scale of the tunnel. At the same time, since the shapes of the connecting passages are different, in order to realize the construction of the connecting passage, the steel segments 2 and the combination structure of multiple steel segments 2 can also be adjusted to the corresponding shapes such as circles, rectangles or other shapes.

[0027] Based on the above structure, the steel segment 2 and the tunnel segment 1 are detachably connected. During tunnel lining assembly, the tunnel segment 1 and the steel segment 2 are fixed together in the construction area. After the tunnel lining construction is completed, the corresponding steel segment 2 can be removed to form an opening area on the segment. In this way, this application achieves the purpose of dismantling the subway connecting passage from the inside without damage without changing other conventional segments. The installation of the combined segments is no different from the assembly of normal segments. During dismantling, only the connecting bolts 3 are used to separate the tunnel segment 1 and the steel segment 2. Then, the steel segment 2 can be removed to form an opening area on the construction surface, thereby realizing the rapid removal of the subway connecting passage portal. Furthermore, the longitudinal hidden beam 4 and the circumferential hidden beam 5 set around the steel segment 2 can improve the structural strength of the tunnel segment 1, avoid the stress concentration problem during the dismantling of the steel segment 2, and effectively ensure the safe dismantling of the steel segment 2.

[0028] like Figure 2 and Figure 3 As shown, in some embodiments of this application, the longitudinal hidden beam 4 includes multiple first longitudinal steel bars 41 spaced apart, and multiple first transverse steel bars 42 are sleeved on the multiple first longitudinal steel bars 4. The multiple first longitudinal steel bars 41 are tied together as one unit by the first transverse steel bars 42. Similar to the arrangement of the longitudinal hidden beam 4, the circumferential hidden beam 5 includes multiple second longitudinal steel bars 51 spaced apart, and multiple second transverse steel bars 52 are sleeved on the multiple second longitudinal steel bars 51. The multiple second longitudinal steel bars 51 are tied together as one unit by the second transverse steel bars 52.

[0029] Based on the above structure, the arrangement of multiple first longitudinal reinforcing bars 41 and multiple second longitudinal reinforcing bars 51 can improve the structural strength of the longitudinal hidden beam 4 and the transverse hidden beam 5, and enhance the connection effect with the poured concrete. Furthermore, to ensure the structural stability of the first longitudinal reinforcing bars 41 and the second longitudinal reinforcing bars 51, this application provides first transverse reinforcing bars 42 to tie the first longitudinal reinforcing bars 41, and second transverse reinforcing bars 52 to tie the second longitudinal reinforcing bars 51. Even further, as... Figure 3 As shown, the perforated segment will cause stress concentration at the junction of the longitudinal hidden beam 4 and the circumferential hidden beam 5, which may lead to risks such as diagonal cracks. In order to strengthen the structural strength at the junction of the two, this application chooses to provide at least two additional first transverse steel bars 42 and second transverse steel bars 52 at the junction of the first longitudinal steel bar 41 and the second longitudinal steel bar 51.

[0030] It should be noted that this application uses UHPC concrete segments, which allow for adjustments to the concrete cover thickness compared to ordinary concrete segments. In other words, the distance between the longitudinal hidden beam 4 and the circumferential hidden beam 5 and the steel segment 1 is set to 30mm-50mm.

[0031] Furthermore, such as Figure 4 As shown, in some embodiments of this application, bolt sleeves matching the connecting bolts 3 are pre-embedded inside the tunnel segment 1. The bolt sleeves provide an installation position for the connecting bolts 3, thereby enabling rapid assembly of the tunnel segment 1 and the steel segment 2.

[0032] Optionally, in some embodiments of this application, the surface of the tunnel segment 1 is provided with a plurality of handholes 11. The handholes 11 provide maintenance access for operators, and operators can also use the handholes 11 on different tunnel segments 1 to perform connection operations between two tunnel segments 1.

[0033] Furthermore, the connecting bolts 3 connecting tunnel segment 1 and steel segment 2 are located on the same horizontal or vertical plane as the handholes 11 of tunnel segment 1. This allows operators to rationally plan the placement and quantity of the connecting bolts 3, avoiding overly dense placement that could negatively impact assembly.

[0034] like Figure 4 As shown, the steel pipe segment 2 of this application includes a longitudinal support plate 21 and a circumferential support plate 22. Multiple longitudinal support plates 21 are arranged sequentially along the extending direction of the circumferential support plates 22, and multiple circumferential support plates 22 are arranged sequentially along the extending direction of the longitudinal support plates 21. The multiple longitudinal support plates 21 and multiple circumferential support plates 22 are staggered and interconnected to form a steel pipe structure detachably connected to the tunnel segment 1. More specifically, the longitudinal support plates 21 and circumferential support plates 22 of this application are welded together.

[0035] Furthermore, in some embodiments of this application, the steel pipe segment 2 also includes a bottom panel 23, which is connected to the longitudinal support plate 21 and the circumferential support plate 22 respectively. In this embodiment of the application, the bottom panel 23 is arc-shaped, and the curvature of the bottom panel 23 matches the curvature of the tunnel segment 1.

[0036] Furthermore, the steel pipe segment 2 also includes a reinforcing plate 24. The reinforcing plate 24 is positioned between any two adjacent circumferential support plates 22 along the direction of the circumferential support plate 22 and is connected to the two circumferential support plates 22 by connecting bolts 3. Since the pre-embedded length of the pre-embedded bolts is at least 20cm, this length exceeds the distance between two adjacent circumferential support plates 22 in the direction of the longitudinal support plate 21, causing the pre-embedded bolts to be unable to be removed. Therefore, a notch needs to be designed on the circumferential support plate 22 to complete the assembly of the pre-embedded bolts. The reinforcing plate 24 can continue to connect two adjacent circumferential support plates 22 after the pre-embedded bolts are installed to compensate for the weakening effect of the notch on the steel pipe segment. In specific disassembly, first remove the connecting bolts 3, then remove the reinforcing plate 24, and finally remove the pre-embedded bolts, and remove the circumferential support plate 22 and the longitudinal support plate 21.

[0037] Furthermore, since the tunnel segments directly determine their resistance to bending deformation, the opening in the connecting passage directly reduces the moment of inertia (I) of the segment ring section, thereby weakening the overall stiffness of the ring. Verifying the bending stiffness is essentially a quantitative analysis of the chain reaction caused by this weakening. Its core value lies in identifying unfavorable working conditions and assessing the longitudinal impact range. For identifying the most unfavorable working conditions, in the construction of connecting passages using the anti-pull shield method, when the thrust acting on the shield reaction frame drops to zero, it is often the most unfavorable stage for the main tunnel. The process of breaking up the tunnel segments and removing the internal supports is also a high-risk condition, with a potential significant increase in bending moment. Regarding assessing the longitudinal impact range, the impact of the opening is not limited to the opening ring itself but is transmitted longitudinally along the tunnel. Full-scale tests show that the longitudinal impact range of internal force redistribution typically reaches three to five rings of tunnel segments on both sides of the opening ring. In particular, the negative bending moment of ordinary concrete segments adjacent to special segments on the opening side will increase significantly, which needs to be focused on in structural design; therefore, the calculation results can provide key basis for the design of temporary structures such as internal supports, help determine the support layout and removal timing, and ensure stability during construction.

[0038] (1) For details of the equivalent cross-section calculation, please refer to Figures 5 to 7 like Figure 5 As shown, the steel structure segments are equivalent to concrete structure segments. Based on the principle mentioned earlier that the strain of the compression zone of the steel structure segments before and after the equivalent concrete section is equal, and the external loads are equal, a formula is derived to calculate the cross-sectional area of ​​the equivalent concrete structure, i.e. In the formula, - Elastic modulus of the steel structure before equivalent -Equivalent elastic modulus of concrete structure -Equivalent cross-sectional area of ​​the steel structure - Equivalent cross-sectional area of ​​concrete structure This invention patent equates the steel structure section to a concrete structure section, keeping the section height unchanged, and evenly distributes the equivalent concrete section on both sides of the original concrete structure to form a regular trapezoidal concrete structure, and then calculates its bending stiffness.

[0039] The equivalent calculation process for the cross section is as follows: in, - Width of steel pipe plate - Width of a single transverse plate of steel pipe segment - The width of the steel pipe base plate is equivalent to half the width of the concrete backing. - The width of all transverse plates of the steel pipe segment is equivalent to half the width of the concrete back section. - Height of steel pipe segment base plate - Height of a single horizontal plate in a steel pipe segment -Equivalent height of steel pipe base plate after concrete installation - Equivalent height of all transverse plate widths of the steel pipe segment after concrete pouring (2) For details on the calculation of structural bending stiffness, please refer to Figures 8 to 9 Divide the T-shaped section into two rectangular sections. Take the axis passing through the centroid of rectangle 1 and parallel to its base as the reference axis, denoted as yc1. Take the axis passing through the centroid of rectangle 2 and parallel to its base as the reference axis, denoted as yc2. The centroidal axis of the entire T-shaped section is denoted as y.

[0040] Let the height of the yc2 axis be Zc2=0. (a) Find the location of the centroid - Area of ​​rectangle 1 - Area of ​​rectangle 2 -Height of the central axis of rectangle 1 -Height of the central axis of rectangle 2, denoted as =0 -Height of the centroidal axis of the entire T-section (b) Calculate the moment of inertia of the cross section. - Moment of inertia of the entire T-section -Moment of inertia of rectangular section 1 -Moment of inertia of rectangular section 2 (c) The formula for calculating the bending stiffness of reinforced concrete segments is: remember - Bending stiffness Another objective of this application is to provide a method for manufacturing a reinforced concrete composite segment structure, comprising the following steps: S1. Set up the segment frame for manufacturing tunnel segments; S2. Install pre-embedded bolt sleeves within the segment frame; S3. Longitudinal and circumferential hidden beams are installed within the segment frame; S4. Concrete is poured into the segment frame to form tunnel segments; S5. Fabrication of steel pipe segments; S6. By splicing tunnel segments with steel segments and connecting them with connecting bolts, recyclable reinforced concrete composite segments can be obtained.

[0041] In summary, this invention provides a reinforced concrete composite segment structure, comprising tunnel segments and steel segments. One or more tunnel segments are spliced ​​together to form a tunnel lining. The steel segments are detachably connected to the tunnel segments, and multiple connecting bolts are provided along the edges of the steel segments to connect the tunnel segments and the steel pipes. Longitudinal and circumferential concealed beams are provided within the tunnel segments, positioned along the edges of the tunnel segments near the steel segments. Compared to existing technologies, this application achieves the goal of non-destructive dismantling of subway connecting passages from the inside without altering other conventional segments. The longitudinal and circumferential concealed beams surrounding the steel segments enhance the structural strength of the tunnel segments, avoid stress concentration during dismantling, and effectively ensure the safe dismantling of the steel segments.

[0042] This invention also provides a method for manufacturing a reinforced concrete composite segment structure, which has the advantages of simple and reliable process and excellent preparation effect.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A reinforced concrete composite segment structure, characterized in that, include: Tunnel segment (1), at least one tunnel segment (1) is provided, and one or more tunnel segments are spliced ​​together to form a tunnel lining; Steel pipe segment (2), wherein at least one steel pipe segment (2) is provided; Connecting bolts (3) are provided along the edges of the tunnel segment (1) and the steel segment (2) for connecting the tunnel segment (1) and the steel segment (2). The tunnel segment (1) is provided with a longitudinal hidden beam (4) and a circumferential hidden beam (5), and the longitudinal hidden beam (4) and the circumferential hidden beam (5) are arranged along the edge of the tunnel segment (1) near the steel pipe segment (2).

2. The reinforced concrete composite segment structure according to claim 1, characterized in that, The longitudinal hidden beam (4) includes multiple first longitudinal steel bars (41) spaced apart. Multiple first transverse steel bars (42) are provided on the outer sleeve of the multiple first longitudinal steel bars (4). The multiple first longitudinal steel bars (41) are tied together as one unit by the first transverse steel bars (42).

3. The reinforced concrete composite segment structure according to claim 1, characterized in that, The circumferential hidden beam (5) includes multiple second longitudinal steel bars (51) spaced apart, and multiple second transverse steel bars (52) are wrapped around the multiple second longitudinal steel bars (51). The multiple second longitudinal steel bars (51) are tied together as one unit by the second transverse steel bars (52).

4. The reinforced concrete composite segment structure according to claim 1, characterized in that, The tunnel segment (1) is pre-embedded with a bolt sleeve that matches the connecting bolt (3).

5. The reinforced concrete composite segment structure according to claim 1, characterized in that, The surface of the tunnel segment (1) is provided with multiple hand holes (11).

6. The reinforced concrete composite segment structure according to claim 1, characterized in that, The steel pipe segment (2) includes a longitudinal support plate (21) and a circumferential support plate (22). The longitudinal support plate (21) is provided in multiple pieces and is arranged sequentially along the extension direction of the circumferential support plate (22). The circumferential support plate (22) is provided in multiple pieces and is arranged sequentially along the extension direction of the longitudinal support plate (21). The multiple longitudinal support plates (21) and the multiple circumferential support plates (22) are staggered and connected to each other.

7. The reinforced concrete composite segment structure according to claim 6, characterized in that, The steel pipe segment (2) also includes a bottom panel (23), which is connected to the longitudinal support plate (21) and the circumferential support plate (22) respectively.

8. The reinforced concrete composite segment structure according to claim 6, characterized in that, The steel pipe segment (2) also includes a reinforcing plate (24), which is disposed between any two adjacent circumferential support plates (22) along the direction of the circumferential support plate (22) and connects the two circumferential support plates (22).

9. A method for manufacturing a reinforced concrete composite segment structure as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Set up the segment frame for making tunnel segments (1); S2. Longitudinal hidden beams (4) and circumferential hidden beams (5) are set at the inner edge of the segment frame; S3. Concrete is poured into the tunnel segment frame to form tunnel segments (1). S4. Making steel pipe segments (2); S5. By splicing the tunnel segment (1) and the steel segment (2) and connecting them with connecting bolts (3), a recyclable steel-concrete composite segment can be obtained.

10. The method for fabricating a reinforced concrete composite segment structure according to claim 9, characterized in that, Step S1 also includes: setting pre-embedded bolt sleeves within the segment frame.

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