Horizontal linked shield tunnel structure and segment blocking method thereof

Abstract

The application discloses a horizontal tandem shield tunnel structure and a segment blocking method thereof, which determines the total number of longitudinal bolts of each ring in two ring tube groups according to the lifting weight of a shield tunneling machine, the outer radius of the ring and the height of an isolation column; calculates the number of segments corresponding to two rings in each ring tube unit and the number of longitudinal bolts of each segment based on the total number of longitudinal bolts of each ring; wherein the number of segments of two rings in the ring tube unit is not equal; determines the central angle corresponding to the segments of each ring in the ring tube unit based on the number of segments corresponding to two rings in each ring tube unit and the number of longitudinal bolts of each segment; and blocks each ring based on the total number of longitudinal bolts, the number of segments, the number of longitudinal bolts of the segments and the central angle corresponding to the segments, thereby solving the segment blocking problem of the horizontal tandem tunnel structure.

Description

A horizontally linked shield tunnel structure and its segment division method Technical Field

[0001] This application relates to the field of shield tunnel technology, and in particular to a horizontally linked shield tunnel structure and its segmentation method. Background Technology

[0002] The scarcity of urban land results in limited available space for tunnel construction, typically leading to tunnels being built below road surfaces. Often, two tunnels are required to accommodate both lanes of traffic or subway lines operating simultaneously. However, due to road width limitations, the clearance between the two tunnels is small. During construction, the tunnel excavated first is significantly affected by the construction of the adjacent tunnel, prompting numerous studies to investigate the mechanical impacts of tunnel construction with small clearances.

[0003] To date, various studies on small clearance tunnels have not fundamentally solved the problem of the impact of close-proximity tunnel construction. For mining methods, drill-and-blast operations have a significant impact on adjacent existing tunnels, thus their application in small-clearance tunnel construction is limited. Therefore, shield tunneling is chosen. However, shield tunneling inevitably encounters situations where the thrust is too high or too low. Excessive thrust can cause significant compression of adjacent tunnels, easily leading to large local deformations and even damage. Conversely, insufficient thrust can cause stress release on the side of the adjacent tunnel closest to the construction site, resulting in deformation and ultimately a "snake-like" curve in the adjacent tunnel's trajectory. To fundamentally solve this problem, either the two tunnels should be spaced far apart, or they should be constructed in a single operation. However, due to urban land constraints, the only viable option is to construct both the left and right tunnels in one operation. Dual-circular shield tunneling machines can achieve simultaneous construction of the left and right lines, a technology already seen in some developed countries, and this is an inevitable choice for future urban tunnel construction in China. However, in the stage where my country is about to develop irregular shield tunnels, there is no method for segmenting tunnel segments for horizontally linked shield tunnel structures, which brings many inconveniences to the design of irregular shield tunnel segments.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a horizontally linked shield tunnel structure and its segmentation method, which addresses the shortcomings of the existing technology and aims to achieve segmentation of segments of arbitrary radius in the horizontally linked shield tunnel structure.

[0006] The technical solution adopted in this application to solve the technical problem is as follows:

[0007] A method for segmenting a horizontally linked shield tunnel structure, the horizontally linked shield tunnel structure comprising two horizontally arranged ring pipe groups; each ring pipe group includes multiple rings arranged longitudinally along the tunnel, the multiple rings being spliced ​​in pairs to form multiple ring pipe units; each ring includes multiple pipe segments, the multiple pipe segments being sequentially spliced ​​circumferentially to form an arc shape; the rings in the two ring pipe groups correspond one-to-one and are connected by isolation columns to form multiple "∞" shaped structures; the method for segmenting the horizontally linked shield tunnel structure includes:

[0008] Based on the lifting weight of the tunnel boring machine, the outer radius of the ring, and the height of the isolation column, determine the total number of longitudinal bolts for each ring in the two ring pipe groups;

[0009] Based on the total number of longitudinal bolts in each ring, calculate the number of segments corresponding to the two rings in each ring pipe unit, and the number of longitudinal bolts in each segment; note that the number of segments in the two rings of a ring pipe unit is not equal;

[0010] Based on the number of segments corresponding to the two rings in each ring unit and the number of longitudinal bolts in each segment, the central angle corresponding to the segment of each ring in the ring unit is determined.

[0011] Each ring is divided into blocks based on the total number of longitudinal bolts, the number of segments, the number of longitudinal bolts in each segment, and the central angle corresponding to the segment.

[0012] The method for segmenting horizontally linked shield tunnel structures, wherein determining the total number of longitudinal bolts for each ring in two ring groups based on the lifting weight of the tunnel boring machine, the outer radius of the ring, and the height of the isolation columns specifically includes:

[0013] According to the calculation formula

[0014]

[0015] Where [W] is the lifting weight of the tunnel boring machine, R is the outer radius of the ring, and h is the height of the isolation column;

[0016] Determine the total number of longitudinal bolts N of the ring when R is the outer radius of the ring in the left ring of the two ring pipe groups, and the total number of longitudinal bolts M of the ring when R is the outer radius of the ring in the right ring of the two ring pipe groups.

[0017] The method for segmenting a horizontally linked shield tunnel structure, wherein calculating the number of segments corresponding to the two rings in each ring unit and the number of longitudinal bolts in each segment based on the total number of longitudinal bolts in each ring specifically includes:

[0018] Based on the correspondence between the number of segments in each ring of the left ring pipe group, the number of longitudinal bolts in each segment, and N, calculate the number of segments corresponding to each ring in the left ring pipe group and the number of longitudinal bolts in each segment.

[0019] Based on the correspondence between the number of segments in each ring of the right ring pipe unit, the number of longitudinal bolts in each segment, and M, the number of segments corresponding to each ring and the number of longitudinal bolts in each segment in the right ring pipe unit are calculated.

[0020] The segmentation method for the horizontally linked shield tunnel structure, wherein the calculation of the number of segments corresponding to each ring in the left ring tunnel unit and the number of longitudinal bolts of each segment, based on the correspondence between the number of segments in each ring of the left ring tunnel unit and N, specifically involves:

[0021] Based on the calculation formula

[0022] ai×ni=N

[0023] Calculate the number of pipe segments a1 and the number of longitudinal bolts n1 of the previous ring in the ring unit of the left ring pipe group, and the number of pipe segments a2 and the number of longitudinal bolts n2 of the next ring in the ring unit of the left ring pipe group; where a1, a2, n1, and n2 are all positive integers, a1≠a2, and i=1,2.

[0024] The segmentation method for the horizontally linked shield tunnel structure, wherein the calculation of the number of segments corresponding to each ring in the ring unit of the right ring tunnel group and the number of longitudinal bolts of each segment, based on the correspondence between the number of segments in each ring of the right ring tunnel group, the number of longitudinal bolts of each segment, and M, specifically involves:

[0025] Based on the calculation formula

[0026] bi×mi=M

[0027] Calculate the number of pipe segments b1 and the number of longitudinal bolts m1 of the previous ring in the ring unit of the right ring pipe group, and the number of pipe segments b2 and the number of longitudinal bolts m2 of the next ring in the ring unit of the right ring pipe group; where b1, b2, m1, and m2 are all positive integers, b1 ≠ b2, and i = 1, 2.

[0028] The method for segmenting the horizontally linked shield tunnel structure, wherein determining the central angle of each segment in each ring unit based on the number of segments corresponding to the two rings in each ring unit and the number of longitudinal bolts in each segment specifically includes:

[0029] According to the calculation formula

[0030]

[0031] Determine the central angle α1 corresponding to the segment of the preceding ring and the central angle α2 corresponding to the segment of the following ring in the left ring pipe unit when R is the outer radius of the ring in the left ring pipe group; where i = 1, 2;

[0032] According to the calculation formula

[0033]

[0034] Determine the central angle β1 corresponding to the segment of the preceding ring and the central angle β2 corresponding to the segment of the following ring in the right ring pipe unit when R is the outer radius of the ring in the right ring pipe group; where i = 1, 2.

[0035] In the segmentation method of the horizontally linked shield tunnel structure, the thickness of the isolation columns must meet the following requirements:

[0036]

[0037]

[0038] B≥t1×cosγ l +t2×cosγ r

[0039] Where B is the thickness of the isolation column, t1 is the thickness of the segment of the middle ring of the left ring pipe group, t2 is the thickness of the segment of the middle ring of the right ring pipe group, Rl is the outer radius of the middle ring of the left ring pipe group, and Rr is the outer radius of the middle ring of the right ring pipe group.

[0040] A horizontally linked shield tunnel structure is obtained by segmenting the tunnel segments using any of the above-described methods. The horizontally linked shield tunnel structure includes two ring pipe groups arranged horizontally. Each ring pipe group includes multiple rings arranged longitudinally along the tunnel, with each pair of rings joined to form multiple ring pipe units. Each ring includes multiple segments, which are sequentially joined circumferentially to form an arc shape. The rings in the two ring pipe groups correspond one-to-one and are connected by isolation columns to form multiple "∞" shaped structures. The centers of the two rings connected by the isolation columns and the center of the isolation columns are located on a horizontal line.

[0041] In the aforementioned horizontally linked shield tunnel structure, each end of the isolation column along the height direction is provided with a V-shaped inclined surface, and the tips of the two V-shaped inclined surfaces are arranged in opposite directions; the two rings connected by the isolation columns are respectively fitted with the corresponding V-shaped inclined surfaces.

[0042] Beneficial effects: This application provides a complete method for segmenting horizontally connected shield tunnel structures, solving the segmentation problem of horizontally connected tunnel structures; moreover, this application can achieve segmentation of arbitrary radii, resulting in multiple sets of segmentation types; requiring only one construction phase, it minimizes the impact of construction on surrounding strata and nearby surface buildings, further improving construction efficiency and saving construction costs. The left and right tunnels are connected as one unit, and their overlapping parts are replaced with isolation columns, saving urban land while improving the utilization rate of the tunnel cross-section. Attached Figure Description

[0043] Figure 1 is a schematic diagram of the “∞” type structure in this application;

[0044] Figure 2 is a schematic diagram of the horizontally linked shield tunnel structure described in this application;

[0045] Figure 3 is a flowchart of the segmentation method for the horizontally linked shield tunnel structure described in this application. Detailed Implementation

[0046] This application provides a method and related apparatus for segmenting tunnel sections in a horizontally linked shield tunnel structure. To make the objectives, technical solutions, and advantages of this application clearer and more explicit, the following detailed description is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0047] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application’s specification means the presence of the stated feature, integer, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we refer to one set of words as adjacent to another set of words, it means that the two sets of words are connected sequentially or by special words / symbols. The term “and / or” as used herein includes all or any unit and all combinations of one or more associated listed items.

[0048] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0049] It should be understood that the sequence number and size of each step in this embodiment do not imply the order of execution. The execution order of each process is determined by its function and internal logic, and should not constitute any limitation on the implementation process of this application embodiment.

[0050] This application provides a horizontally linked shield tunnel structure, comprising two ring pipe groups arranged horizontally. This application uses an example of the two ring pipe groups arranged in a left-right direction to specifically illustrate the horizontally linked shield tunnel structure.

[0051] Each ring group comprises multiple rings arranged longitudinally along the tunnel, and these rings are joined together in pairs to form multiple ring units. Specifically, as shown in Figures 1 and 2, the left ring group 100 of the two ring groups contains multiple ring units 10, each ring unit comprising two rings 1 arranged longitudinally along the tunnel; the right ring group 200 of the two ring groups contains multiple ring units 20, each ring unit 20 comprising two rings 2 arranged longitudinally along the tunnel.

[0052] Each ring 1 in the left ring tunnel assembly 100 includes multiple segments 4, which are sequentially spliced ​​together in a superior arc shape. Each ring 2 in the right ring tunnel assembly 200 also includes multiple segments 5, which are sequentially spliced ​​together in a superior arc shape. The multiple rings 1 in the left ring tunnel assembly 100 correspond one-to-one with the multiple rings 2 in the right ring tunnel assembly 200, and the corresponding two rings are connected by isolation columns 3, thus forming multiple "∞" shaped structures in the horizontally linked shield tunnel structure.

[0053] Specifically, a left ring 1 (i.e., a ring in the left ring pipe group 100) and a right ring 2 (i.e., a ring in the right ring pipe group 200) are connected by an isolation column 3 to form an "∞" shaped structure. In the "∞" shaped structure, the openings of the left ring 1 and the right ring 2 are arranged opposite to each other, and the isolation column 3 is connected to the openings of the left ring 1 and the right ring 2 respectively, thus forming an "∞" shaped structure, and making the isolation column 3 play the role of bearing, connecting and transmitting force between the left ring 1 and the right ring 2.

[0054] In one embodiment of this application, in the “∞”-shaped structure formed by the connection of the isolation column 3, the centers of the two rings (1 and 2) and the center of the isolation column 3 are located on a horizontal line; that is, the center of the left ring 1, the center of the isolation column 3 and the center of the right ring 2 are arranged along a horizontal line, so that the isolation column 3 and the left ring 1 and the isolation column 3 and the right ring 2 are in vertical contact, which is beneficial to improving the stability of the tunnel structure.

[0055] It should be noted that, for a ring pipe unit, the central angles of the segments of the preceding ring are not equal to those of the segments of the following ring. That is, for the left ring pipe group 100, the arc lengths of the segments 4 of the two left rings 1 in its ring pipe unit 10 are not equal; for the right ring pipe group 200, the arc lengths of the segments 5 of the two right rings 2 in its ring pipe unit 20 are not equal. This results in the segment splicing seams of the two ring pipes being misaligned when splicing the two ring pipes arranged longitudinally along the tunnel, thereby improving the support stability of the horizontally linked shield tunnel structure.

[0056] Each segment 4 of the left ring 1 is provided with a longitudinal bolt 6, which is used to connect adjacent left rings 1 in the left ring pipe group 100; and all longitudinal bolts 6 of the left ring 1 are evenly distributed along the arc length direction of the left ring 1. Each segment 5 of the right ring 2 is provided with a longitudinal bolt 6, which is used to connect adjacent right rings 2 in the right ring pipe group 200; and all longitudinal bolts 6 of the right ring 2 are evenly distributed along the arc length direction of the right ring 2.

[0057] In one embodiment of this application, the isolation column 3 has V-shaped ramps at both ends along its height, with the tips of the two V-shaped ramps facing opposite directions. In the "∞"-shaped structure formed by the isolation columns 3, the two ends of the opening of the left ring 1 are respectively connected to the two V-shaped ramps, and the two ends of the opening of the right ring 2 are also respectively connected to the two V-shaped ramps. The opening angle of the V-shaped ramps is equal to the size of the V-angle formed between the opening of the left ring 1 and the opening of the right ring 2, which is more conducive to the fit between the left ring 1 and the right ring 2 and the V-shaped ramps, thereby improving the overall support strength and stability of the horizontally linked shield tunnel structure.

[0058] In one embodiment of this application, when the weight of the isolation column 3 is greater than the lifting weight [W] of the tunnel boring machine, the isolation column 3 adopts a hollow structure to reduce the overall weight of the isolation column 3.

[0059] In another embodiment of this application, when the weight of the isolation column 3 is less than or equal to the lifting weight [W] of the tunnel boring machine, the isolation column 3 adopts a solid structure to ensure the overall strength of the isolation column 3.

[0060] Longitudinal bolts can also be installed on the isolation pillar 3 to connect adjacent isolation pillars 3 arranged longitudinally along the tunnel.

[0061] In one embodiment of this application, the width of the inclined surface corresponding to the left ring 1 in the V-shaped inclined surface is greater than the thickness of the tube segment of the left ring 1, and the width of the inclined surface corresponding to the right ring 2 in the V-shaped inclined surface is greater than the thickness of the tube segment of the right ring 2.

[0062] Based on the horizontally linked shield tunnel structure described above, this application also provides a method for segmenting the tunnel segments of a horizontally linked shield tunnel structure. As shown in Figure 3, the method for segmenting the tunnel segments of a horizontally linked shield tunnel structure includes:

[0063] S100. Based on the lifting weight of the tunnel boring machine, the outer radius of the ring, and the height of the isolation column, determine the total number of longitudinal bolts for each ring in the two ring pipe groups.

[0064] The outer radius of the ring includes the outer radius of the ring in the left ring group of the two ring pipe groups (i.e., the outer radius of the left ring) Rl, and the outer radius of the ring in the right ring group of the two ring pipe groups (i.e., the outer radius of the right ring) Rr.

[0065] The determination of the total number of longitudinal bolts for each ring in the two ring pipe groups, based on the lifting weight of the tunnel boring machine, the outer radius of the ring, and the height of the isolation column, specifically includes:

[0066] According to the calculation formula

[0067]

[0068] Where [W] is the lifting weight of the tunnel boring machine, R is the outer radius of the ring, and h is the height of the isolation column;

[0069] Determine the following: the total number of longitudinal bolts N in the ring when R is the outer radius Rl of the left ring of the two ring pipe groups; and the total number of longitudinal bolts M in the ring when R is the outer radius Rr of the right ring of the two ring pipe groups. It should be noted that both N and M are positive integers.

[0070] Specifically, for the left ring:

[0071]

[0072] Since [W], h, and Rl are all known in the above calculation formula, the total number of longitudinal bolts N of the left ring can be obtained according to the above calculation formula.

[0073] For the right loop:

[0074]

[0075] Since [W], h, and Rr are all known in the above formula, the total number of longitudinal bolts M of the left ring can be obtained from the above formula.

[0076] S200. Based on the total number of longitudinal bolts in each ring, calculate the number of segments corresponding to the two rings in each ring pipe unit, and the number of longitudinal bolts in each segment; wherein the number of segments in the two rings in the ring pipe unit is not equal.

[0077] The calculation of the number of pipe segments corresponding to the two rings in each ring pipe unit and the number of longitudinal bolts in each pipe segment based on the total number of longitudinal bolts in each ring specifically includes:

[0078] S201. Based on the correspondence between the number of segments in each ring of the left ring pipe group, the number of longitudinal bolts in each segment, and N, calculate the number of segments corresponding to each ring in the left ring pipe group and the number of longitudinal bolts in each segment.

[0079] Specifically, for each ring, the product of the number of its segments and the number of longitudinal bolts in each segment equals the total number of longitudinal bolts in that ring. Based on this correspondence, the number of segments corresponding to each left ring and the number of longitudinal bolts in each segment of the left ring can be calculated.

[0080] Based on the calculation formula

[0081] ai×ni=N

[0082] Where a1, a2, n1, and n2 are all positive integers, a1 ≠ a2, and i = 1, 2; a1 is the number of segments corresponding to the previous ring in the ring unit of the left ring pipe group, n1 is the number of longitudinal bolts for each segment in the previous ring, a2 is the number of segments corresponding to the next ring in the ring unit of the left ring pipe group, and n2 is the number of longitudinal bolts for each segment in the next ring; calculate a1, a2, n1, and n2 respectively.

[0083] It should be noted that if the above calculation formula cannot yield a1, a2, n1, and n2 that satisfy the conditions that a1, a2, n1, and n2 are all positive integers and a1 ≠ a2, then the following calculation formula must be satisfied:

[0084] Under the premise that N is the solution, adjust N until a1, a2, n1, and n2 have solutions.

[0085] S202. Based on the correspondence between the number of segments in each ring of the right ring pipe group, the number of longitudinal bolts in each segment, and M, calculate the number of segments corresponding to each ring in the right ring pipe group and the number of longitudinal bolts in each segment.

[0086] Specifically, for each ring, the product of the number of its segments and the number of longitudinal bolts in each segment equals the total number of longitudinal bolts in that ring. Based on this correspondence, the number of segments corresponding to each right ring and the number of longitudinal bolts in each segment of the right ring can be calculated.

[0087] Based on the calculation formula

[0088] bi×mi=M

[0089] Where b1, b2, m1, and m2 are all positive integers, b1 ≠ b2, and i = 1, 2; b1 is the number of segments corresponding to the previous ring in the ring unit of the right ring pipe group, m1 is the number of longitudinal bolts for each segment in the previous ring, b2 is the number of segments corresponding to the next ring in the ring unit of the right ring pipe group, and m2 is the number of longitudinal bolts for each segment in the next ring; calculate b1, b2, m1, and m2 respectively.

[0090] It should be noted that if the above calculation formula cannot yield b1, b2, m1, and m2 that satisfy the conditions that b1, b2, m1, and m2 are all positive integers and b1 ≠ b2, then the following calculation formula must be satisfied:

[0091]

[0092] Under the premise that M is the solution, adjust M until b1, b2, m1, and m2 have solutions.

[0093] S300. Based on the number of segments corresponding to the two rings in each ring unit and the number of longitudinal bolts in each segment, determine the central angle corresponding to the segment of each ring in the ring unit.

[0094] The determination of the central angle corresponding to the segment of each ring in each ring unit based on the number of segments corresponding to the two rings in each ring unit and the number of longitudinal bolts in each segment specifically includes:

[0095] S301, According to the calculation formula

[0096]

[0097] Determine the central angle α1 corresponding to the segment of the preceding ring and the central angle α2 corresponding to the segment of the following ring in the ring unit of the left ring pipe group when R is the outer radius Rl of the ring in the left ring pipe group; where i = 1, 2;

[0098] Specifically, according to the calculation formula

[0099]

[0100]

[0101] Given that N, n1, n2, Rl, and h are all known, α1 and α2 can be determined.

[0102] S302, According to the calculation formula

[0103]

[0104] Determine the central angle β1 corresponding to the segment of the preceding ring and the central angle β2 corresponding to the segment of the following ring in the ring unit of the right ring pipe group when R is the outer radius Rr of the ring in the right ring pipe group; where i = 1, 2.

[0105] Specifically, according to the calculation formula

[0106]

[0107]

[0108] Given that M, m1, m2, Rr, and h are all known, β1 and β2 can be determined.

[0109] S400, each ring is divided into blocks based on the total number of longitudinal bolts, the number of segments, the number of longitudinal bolts in the segments, and the central angle corresponding to the segments.

[0110] Specifically, based on: the total number of longitudinal bolts N of the left ring, the number of segments a1 corresponding to the previous ring in the ring unit of the left ring pipe group, the number of longitudinal bolts n1 of each segment in the previous ring, and the central angle α1 of the segment in the previous ring, and the number of segments a2 corresponding to the next ring in the ring unit of the left ring pipe group, the number of longitudinal bolts n2 of each segment in the next ring, and the α2 of the segment in the next ring, the front and rear rings in each ring unit of the left ring pipe group are divided into blocks; and based on: the total number of longitudinal bolts M of the right ring, the number of segments b1 corresponding to the previous ring in the ring unit of the right ring pipe group, the number of longitudinal bolts m1 of each segment in the previous ring, and the central angle β1 of the segment in the previous ring, and the number of segments b2 corresponding to the next ring in the ring unit of the right ring pipe group, the number of longitudinal bolts m2 of each segment in the next ring, and the β2 of the segment in the next ring, the front and rear rings in each ring unit of the right ring pipe group are divided into blocks.

[0111] As can be seen, this application provides a complete method for segmenting horizontally linked shield tunnel structures, solving the segmentation problem of horizontally linked tunnel structures; and this application can realize segmentation with arbitrary left ring radius and arbitrary right ring radius, obtaining multiple sets of segmentation types, and then carrying out segment optimization design.

[0112] Since the thickness of the guardrail is affected by the vehicle type, weight, and speed applicable to the tunnel, based on the above considerations, in one embodiment of this application, the thickness B of the guardrail must meet the following requirements:

[0113]

[0114]

[0115] B≥t1×cosγl +t2×cosγ r

[0116] Where B is the thickness of the isolation column, t1 is the thickness of the segment of the middle ring of the left ring pipe group, t2 is the thickness of the segment of the middle ring of the right ring pipe group, Rl is the outer radius of the middle ring of the left ring pipe group, and Rr is the outer radius of the middle ring of the right ring pipe group.

[0117] Based on the above-described segmentation method for horizontally linked shield tunnel structures, a specific embodiment of this application is as follows:

[0118] Given that the outer radius of the left ring is Rl = 4 (m), the thickness of the segment of the left ring is t1 = 0.3 (m), the height of the isolation column is h = 5 (m), the thickness of the isolation column is B = 1 (m), the lifting weight of the tunnel boring machine is [W] = 100 (kN), the outer radius of the right ring is Rr = 5 (m), and the thickness of the segment of the right ring is t2 = 0.5 (m).

[0119] Step 1: Determine the total number of longitudinal bolts N on the left ring based on the lifting weight [W] of the tunnel boring machine, the outer radius Rl of the left ring, and the height h of the isolation column.

[0120]

[0121] The calculated N is 12;

[0122] Based on the lifting weight [W] of the tunnel boring machine, the outer radius Rr of the right ring, and the height h of the isolation column, determine the total number of longitudinal bolts M of the right ring:

[0123]

[0124] The calculated M is 18.

[0125] Step 2: Based on the total number N of longitudinal bolts on the left ring, and the calculation formula:

[0126] ai×ni=12

[0127] Two sets of positive integer solutions are selected: the number of pipe segments corresponding to the previous ring in the left ring pipe group, a1, and the number of longitudinal bolts n1 for each pipe segment in the previous ring; the number of pipe segments corresponding to the next ring, a2, and the number of longitudinal bolts n2 for each pipe segment in the next ring; take a1 = 6, n1 = 2; a2 = 4, n2 = 3;

[0128] Based on the total number M of longitudinal bolts on the right ring, and the calculation formula:

[0129] bi×mi=18

[0130] Two sets of positive integer solutions are selected: the number of pipe segments corresponding to the previous ring in the right ring pipe group, b1, and the number of longitudinal bolts m1 for each pipe segment in the previous ring; the number of pipe segments corresponding to the next ring, b2, and the number of longitudinal bolts m2 for each pipe segment in the next ring; take b1 = 9, m1 = 2; b2 = 6, m2 = 3.

[0131] Step 3: Based on the number of segments a1 in the previous ring of the left ring pipe unit and the number of longitudinal bolts n1 in each segment of the previous ring, determine the central angle α1 corresponding to the segment of the previous ring in the left ring pipe unit:

[0132]

[0133] Based on the number of segments a2 in the next ring of the left ring pipe unit and the number of longitudinal bolts n2 in each segment of the next ring, determine the central angle α2 corresponding to the segment of the next ring in the left ring pipe unit:

[0134]

[0135] Step 4: Based on the number of segments b1 and the number of longitudinal bolts m1 of each segment in the previous ring of the right ring pipe unit, determine the central angle β1 corresponding to the segment in the previous ring of the right ring pipe unit:

[0136]

[0137] Based on the number of segments b2 in the next ring of the right ring pipe unit and the number of longitudinal bolts m2 in each segment of the next ring, determine the central angle β2 corresponding to the segment of the next ring in the right ring pipe unit:

[0138]

[0139] This segmented design has the following advantages: it satisfies the segmentation requirements of horizontally integrated shield tunnel segments, providing a left ring with an outer radius of 4m and a right ring with an outer radius of 5m. The segments allow for the single assembly of the left and right tunnels, resolving the mutual interference issues in the construction of separated tunnels with small clearances. Furthermore, requiring only one construction phase minimizes the impact on surrounding strata and nearby surface buildings, further improving construction efficiency and saving costs. Connecting the left and right tunnels as a single unit and replacing their overlapping sections with isolation columns saves urban land while improving the utilization rate of the tunnel cross-section. Therefore, this application can serve as a technical reserve.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for segmenting horizontally connected shield tunnel structures, characterized in that, The aforementioned horizontally linked shield tunnel structure includes two horizontally arranged ring pipe groups; each ring pipe group includes multiple rings arranged longitudinally along the tunnel, with the multiple rings spliced ​​in pairs to form multiple ring pipe units; each ring includes multiple segments, which are sequentially spliced ​​circumferentially to form an arc shape; the rings in the two ring pipe groups correspond one-to-one and are connected by isolation columns to form multiple " The horizontally linked shield tunnel structure is divided into segments as follows: Based on the lifting weight of the shield machine, the outer radius of the ring, and the height of the isolation column, the total number of longitudinal bolts in each ring of the two ring groups is determined; based on the total number of longitudinal bolts in each ring, the number of segments corresponding to the two rings in each ring unit and the number of longitudinal bolts in each segment are calculated; wherein, the number of segments in the two rings of the ring unit is not equal; based on the number of segments corresponding to the two rings in each ring unit and the number of longitudinal bolts in each segment, the central angle corresponding to the segment of each ring in the ring unit is determined; each ring is divided into segments based on the total number of longitudinal bolts, the number of segments, the number of longitudinal bolts in the segments, and the central angle corresponding to the segments; the determination of the total number of longitudinal bolts in each ring of the two ring groups based on the lifting weight of the shield machine, the outer radius of the ring, and the height of the isolation column specifically includes: based on the calculation formula... Wherein, [W] is the lifting weight of the tunnel boring machine, R is the outer radius of the ring, and h is the height of the isolation column; determine the total number of longitudinal bolts N of the ring when R is the outer radius of the ring in the left ring of the two ring pipe groups, and the total number of longitudinal bolts M of the ring when R is the outer radius of the ring in the right ring of the two ring pipe groups.

2. The segmentation method for a horizontally linked shield tunnel structure according to claim 1, characterized in that, The calculation of the number of segments corresponding to the two rings in each ring pipe unit and the number of longitudinal bolts in each segment, based on the total number of longitudinal bolts in each ring, specifically includes: calculating the number of segments corresponding to each ring in the left ring pipe unit and the number of longitudinal bolts in each segment, based on the correspondence between the number of segments in each ring, the number of longitudinal bolts in each segment, and N in the left ring pipe group; and calculating the number of segments corresponding to each ring and the number of longitudinal bolts in each segment, based on the correspondence between the number of segments in each ring, the number of longitudinal bolts in each segment, and M in the right ring pipe group.

3. The segmentation method for a horizontally linked shield tunnel structure according to claim 2, characterized in that, The calculation of the number of segments corresponding to each ring in the left ring pipe unit, and the number of longitudinal bolts in each segment, based on the correspondence between the number of segments in each ring, the number of longitudinal bolts in each segment, and N, specifically involves: [Calculation formula not provided in the original text]. Calculate the number of pipe segments a1 and the number of longitudinal bolts n1 for each segment in the preceding ring of the left ring pipe unit, and the number of pipe segments a2 and the number of longitudinal bolts n2 for each segment in the following ring of the left ring pipe unit; where a1, a2, n1, and n2 are all positive integers, a1 a2, and i=1,2.

4. The segment division method for a horizontally linked shield tunnel structure according to claim 3, characterized in that, The calculation of the number of segments corresponding to each ring and the number of longitudinal bolts for each segment in the ring unit of the right ring pipe group, based on the correspondence between the number of segments in each ring, the number of longitudinal bolts for each segment, and M, is specifically as follows: Based on the calculation formula... Calculate the number of pipe segments b1 and the number of longitudinal bolts m1 for each segment in the preceding ring of the right ring pipe unit, and the number of pipe segments b2 and the number of longitudinal bolts m2 for each segment in the following ring of the right ring pipe unit; where b1, b2, m1, and m2 are all positive integers, b1 b², and i = 1, 2.

5. The segment division method for a horizontally linked shield tunnel structure according to claim 4, characterized in that, The step of determining the central angle corresponding to the segment of each ring in each ring unit based on the number of segments corresponding to the two rings in each ring unit and the number of longitudinal bolts in each segment specifically includes: according to the calculation formula Determine the central angle α1 corresponding to the segment of the preceding ring and the central angle α2 corresponding to the segment of the following ring in the left ring pipe unit when R is the outer radius of the ring in the left ring pipe group; where i=1,2; according to the calculation formula Determine the central angle β1 corresponding to the segment of the preceding ring and the central angle β2 corresponding to the segment of the following ring in the right ring pipe unit when R is the outer radius of the ring in the right ring pipe group; where i=1,2.

6. The segment division method for a horizontally linked shield tunnel structure according to claim 1, characterized in that, The thickness of the isolation column must meet the following requirements: Where B is the thickness of the isolation column, t1 is the thickness of the segment of the middle ring of the left ring pipe group, t2 is the thickness of the segment of the middle ring of the right ring pipe group, Rl is the outer radius of the middle ring of the left ring pipe group, and Rr is the outer radius of the middle ring of the right ring pipe group.

7. A horizontally linked shield tunnel structure, characterized in that, It is obtained by segmenting the horizontally linked shield tunnel structure according to any one of claims 1-6. The horizontally linked shield tunnel structure includes two ring pipe groups, which are arranged horizontally. Each ring pipe group includes multiple rings arranged longitudinally along the tunnel, and the multiple rings are spliced ​​in pairs to form multiple ring pipe units. Each ring includes multiple segments, and the multiple segments are spliced ​​circumferentially to form an arc shape. The rings in the two ring pipe groups correspond one-to-one and are connected by isolation columns to form multiple segments. The structure is shaped like an "; the centers of the two rings connected by the isolation column and the center of the isolation column are located on a horizontal line.

8. The horizontally linked shield tunnel structure according to claim 7, characterized in that, The isolation column has V-shaped ramps at both ends along its height, with the tips of the two V-shaped ramps facing opposite directions; the two rings connected by the isolation column are respectively fitted to the corresponding V-shaped ramps.

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