Design method of square piece combined structure for turning section of shield tunnel

Abstract

The invention provides a design method of a mouth-shaped piece combined structure for a shield tunnel turning section, which comprises the following steps of: determining the minimum curvature radius of the shield tunnel turning section and determining the length of the turning section according to the minimum curvature radius through the mouth-shaped piece combined structure comprising a plurality of wedge-shaped mouth-shaped pieces which are sequentially spliced along the extension direction of the shield tunnel turning section; determining the radial size of each wedge-shaped square piece along the turning section of the shield tunnel, determining the difference between the inner arc length and the outer arc length of the square piece combined structure according to the minimum curvature radius and the radial size, and determining the average breadth of each square piece along the extension direction of the turning section of the shield tunnel, according to the length and the average breadth of the turning section, the number N of the wedge-shaped square pieces needing to be arranged corresponding to the turning section of the shield tunnel is determined, the average wedge-shaped amount of each wedge-shaped square piece is determined according to the difference between the inner arc length and the outer arc length and the number, and the typesetting form of the square piece combined structure is determined according to the average wedge-shaped amount and the number N. By means of the device, turning and precision adjustment of the square piece of the turning section of the shield tunnel can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnels, in particular to a design method for a mouth piece combination structure used in a turning section of a shield tunnel. Background Art

[0002] In underground engineering, shield tunneling is booming due to its advantages, including safety, high automation, minimal environmental impact, and seasonality. This is particularly true for river and sea crossing tunnels, where large and even ultra-large diameter shield machines are being constructed and put into operation in more complex environments and extreme geological conditions. Furthermore, shield tunneling projects with larger cross-sections, more extreme geology, and more complex surrounding environments have led to more complex horizontal and vertical alignments. This requires higher levels of precision in the design and construction of prefabricated shield segments and flange components to meet the turning requirements of large-diameter shield machines.

[0003] The large-scale use of prefabricated and assembled shield mouth parts has great advantages in construction quality and efficiency. However, the mouth parts commonly used at home and abroad are all standard parts. Standard mouth parts cannot turn during assembly, and it is difficult to meet the precision requirements of shield turning sections. As a result, in actual projects, shield tunnel mouth parts are greatly misaligned during the assembly process of turning sections, and even frequently infringe upon building limits. Improper handling will seriously affect the service life and operational safety of the shield tunnel.

[0004] In view of this, it is necessary to propose a design method for the combined structure of the mouth pieces of the turning section of the shield tunnel to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0005] The main purpose of the present invention is to provide a design method for the combined structure of the mouth pieces of the turning section of the shield tunnel, so as to solve the technical problem in the prior art that the shield tunnel using standard mouth pieces cannot achieve turning during assembly and it is difficult to meet the precision requirements of the shield turning section assembly.

[0006] To achieve the above-mentioned object, the present invention provides a method for designing a truncated member assembly structure for a shield tunnel turning section, wherein the truncated member assembly structure comprises a plurality of wedge-shaped truncated members sequentially spliced ​​along the extension direction of the shield tunnel turning section, and the method comprises the following steps:

[0007] S1, determine the minimum curvature radius R of the shield tunnel turning section min , and according to the minimum curvature radius R min Determine the length of the turning section L tun ;

[0008] S2, determine the radial dimension L of each wedge-shaped mouth piece along the turning section of the shield tunnel k , and according to the minimum curvature radius Rmin and the radial dimension L k Determine the inner and outer arc length difference δ of the mouth piece combination structure s ; Wherein, the turning radius corresponding to the central axis of the extension direction of the mouth-shaped component assembly structure is the curvature radius of the turning section of the shield tunnel;

[0009] S3, determining the average width B of each of the mouth pieces along the extending direction of the shield tunnel turning section, and according to the length L of the turning section tun and the average width B to determine the number N of wedge-shaped opening pieces required to be arranged in the turning section of the shield tunnel;

[0010] S4, according to the inner and outer arc length difference δ s and the number N determine the average wedge amount Δ of each wedge-shaped mouth piece;

[0011] S5, determining the layout form of the mouth-shaped component combination structure according to the average wedge amount Δ and the number N.

[0012] Preferably, in step S1, according to the minimum curvature radius R min Determine the length of the turning section L tun The specific steps include:

[0013] Determine the turning center angle θ corresponding to the turning section of the shield tunnel;

[0014] According to the formula Determine the length L of the turning section tun .

[0015] Preferably, the step S2 specifically includes the steps of:

[0016] According to the formula Determine the outer arc length L of the mouth-shaped component combination structure outside ;

[0017] According to the formula Determine the inner arc length L of the mouth-shaped component combination structure inside ;

[0018] According to the formula δ s =L outside -L inside Determine the inner and outer arc length difference δ of the mouth piece combination structure s .

[0019] Preferably, in step S3, the length L of the turning section is tun Determining the number N of wedge-shaped opening pieces required to be arranged in the shield tunnel turning section based on the average width B specifically includes the following steps:

[0020] According to the formula N=Ltun / B determines the number N of wedge-shaped mouth pieces that need to be arranged corresponding to the turning section of the shield tunnel.

[0021] Preferably, the step S4 specifically includes the steps of:

[0022] According to the formula Δ=k×B×L k / R min Determine the average wedge amount Δ of each wedge-shaped mouth piece; where k is the comprehensive correction coefficient for the wedge amount of the mouth piece.

[0023] Preferably, the wedge-shaped mouth piece includes a second wedge-shaped surface and a third wedge-shaped surface arranged opposite to each other along its own width direction, wherein the first wedge-shaped surface of the jth wedge-shaped mouth piece and the second wedge-shaped surface of the j+1th wedge-shaped mouth piece are spliced ​​together, j≥1, and j is a positive integer.

[0024] Preferably, the second wedge-shaped surface is recessed with a first tongue-and-groove at the outer edge of the wedge-shaped mouth part, the second wedge-shaped surface is recessed with a second tongue-and-groove at the inner edge of the wedge-shaped mouth part, the third wedge-shaped surface is recessed with a third tongue-and-groove at the outer edge of the wedge-shaped mouth part, and the third wedge-shaped surface is recessed with a fourth tongue-and-groove at the inner edge of the wedge-shaped mouth part, wherein the first tongue-and-groove of the j-th mouth part and the third tongue-and-groove of the j+1-th mouth part are spliced ​​together to form a first installation groove opening toward the outer edge, the second tongue-and-groove of the j-th mouth part and the fourth tongue-and-groove of the j+1-th mouth part are spliced ​​together to form a second installation groove opening toward the inner edge, and a first sealing structure is installed in both the first installation groove and the second installation groove.

[0025] Preferably, the joint between the first wedge-shaped surface of the jth wedge-shaped mouth piece and the second wedge-shaped surface of the j+1th wedge-shaped mouth piece is provided with a second sealing structure, and the second sealing structure is provided between the first mounting groove and the second mounting groove.

[0026] Preferably, the comprehensive correction coefficient k of the wedge shape of the mouth piece is set between 1.5 and 2.5.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention provides a design method for a mouth piece combination structure for a turning section of a shield tunnel. The mouth piece combination structure includes a plurality of wedge-shaped mouth pieces spliced ​​in sequence along the extension direction of the turning section of the shield tunnel. The minimum curvature radius of the turning section of the shield tunnel is determined, and the turning section length is determined according to the minimum curvature radius. The radial size of each wedge-shaped mouth piece along the turning section of the shield tunnel is determined. The difference between the inner and outer arc lengths of the mouth piece combination structure is determined according to the minimum curvature radius and the radial size. The average width of each mouth piece along the extension direction of the turning section of the shield tunnel is determined. The number N of wedge-shaped mouth pieces required to be arranged corresponding to the turning section of the shield tunnel is determined according to the turning section length and the average width. The average wedge amount of each wedge-shaped mouth piece is determined according to the inner and outer arc length difference and the number. The layout form of the mouth piece combination structure is determined according to the average wedge amount and the number N.

[0029] This application sets the wedge amount for the prefabricated mouth parts based on the calculation of the wedge amount of the shield mouth parts. At the same time, according to the different horizontal projections of the mouth parts, they are divided into three types: single-sided wedge-shaped mouth parts, double-sided wedge-shaped mouth parts and standard mouth parts. Then, based on the reasonable combination and layout design of the three different types of mouth parts, the difficult problem of turning and precision adjustment of the internal structure of the shield using prefabricated assembly is solved. This application solves the problem that the mouth parts of the shield tunnel currently using prefabricated assembly cannot turn and cannot be precision adjusted. It can effectively avoid problems such as excessive misalignment during the assembly of the mouth parts, difficulty in bolt installation, and internal structure intrusion into the building limit, thereby ensuring the overall engineering quality and durability of the shield tunnel. This application fills a gap in the current design of the internal structure of the curved section shield, and has a strong guiding significance for the design and construction of ultra-large diameter shield tunnel projects whose internal structures are mainly prefabricated and assembled. At the same time, it promotes the progress of shield tunnel design and construction methods, and has significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 is a flow chart corresponding to a design method in one embodiment of the present invention;

[0032] Figure 2 It is a cross-sectional schematic diagram of a prefabricated mouth piece in the prior art;

[0033] Figure 3 for Figure 2 The view from point A in the figure;

[0034] Figure 4 A top view of the mouth-shaped component assembly structure arranged in a turning section of a shield tunnel in one embodiment of the present invention;

[0035] Figure 5 Schematic diagram of a top view of a single-sided wedge-shaped mouth piece in one embodiment of the present invention;

[0036] Figure 6 Schematic diagram of a top view of a double-sided wedge-shaped mouth piece in one embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the top view of a standard mouth piece in the prior art;

[0038] Figure 8 This is a schematic diagram of the side wall joint structure of the mouth piece in the prior art;

[0039] Figure 9 Schematic diagram of the side wall sealing joint structure of the wedge-shaped mouth piece in one embodiment of the present invention;

[0040] Figure 10 It is an enlarged schematic diagram of the tongue-and-groove portion of the side wall sealing seam of the wedge-shaped mouth piece in one embodiment of the present invention;

[0041] Figure 11 Schematic diagram of the typesetting of single-sided wedge-shaped characters in one embodiment of the present invention;

[0042] Figure 12 Schematic diagram of the typesetting of double-sided wedge-shaped characters in one embodiment of the present invention;

[0043] Figure 13 Schematic diagram of the combined layout of a single-sided wedge-shaped mouth piece and a standard mouth piece in one embodiment of the present invention;

[0044] Figure 14 Schematic diagram of the combined layout of double-sided wedge-shaped mouth pieces and standard mouth pieces in one embodiment of the present invention.

[0045] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0046] Description of Figure Numbers:

[0047] 10. Wedge-shaped mouth piece; 110. Outer edge; 120. Inner edge; 130. First wedge-shaped surface; 140. Flat surface; 150. Second wedge-shaped surface; 160. Third wedge-shaped surface; 170. Center axis; 180. Single-sided wedge-shaped mouth piece; 190. Double-sided wedge-shaped mouth piece; 210. First mounting groove; 220. Second mounting groove; 230. First sealing structure; 231. Foam rod; 232. Polysulfide sealant; 240. Second sealing structure; 310. First bolt hole; 320. Second bolt hole; 40. Flat seam; 50. Standard mouth piece. DETAILED DESCRIPTION

[0048] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, the descriptions of "right portion" and "middle portion" in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "right portion" and "middle portion" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] Please see the attached Figures 1 to 14 In one embodiment of the present invention, a method for designing a truncated member assembly structure for a shield tunnel turning section is provided. The truncated member assembly structure includes a plurality of wedge-shaped truncated members 10 sequentially spliced ​​along the extension direction of the shield tunnel turning section. The method includes the following steps:

[0053] S1, determine the minimum curvature radius R of the shield tunnel turning section min , and according to the minimum curvature radius R minDetermine the length of the turning section L tun Specifically, the minimum curvature radius R of the shield tunnel turning section min It can be directly obtained according to the shield tunnel project design plan. Specifically, in step S1, according to the minimum curvature radius R min Determine the length of the turning section L tun Specifically, the steps include: determining the turning center angle θ corresponding to the turning section of the shield tunnel, and then using the formula Determine the length L of the turning section tun .like Figure 4 As shown, the shield tunnel turning section is an arc, and the number 170 is also the arc corresponding to the shield tunnel turning section. By determining the turning center, starting position and ending position of the shield tunnel turning section, the turning center angle θ corresponding to the shield tunnel turning section can be determined. Then, the turning section length L can be determined according to the arc length formula. tun .

[0054] It should be noted that if Figure 2 and 3 As shown, each wedge-shaped member 10 is provided with a first bolt hole 310 and a second bolt hole 320 , and two adjacent wedge-shaped members 10 are assembled and connected by oblique bolts penetrating the first bolt hole 310 and the second bolt hole 320 .

[0055] S2, determine the radial dimension L of each wedge-shaped mouth piece 10 along the turning section of the shield tunnel k , and according to the minimum curvature radius R min and the radial dimension L k Determine the inner and outer arc length difference δ of the mouth piece combination structure s ; Wherein, the turning radius corresponding to the central axis 170 of the extension direction of the mouth-shaped component assembly structure is the curvature radius of the shield tunnel turning section; Specifically, as Figure 7 As shown, for the standard mouth piece 50, the top view of the standard mouth piece 50 is rectangular, and the wedge-shaped mouth piece 10 in this application is set with a suitable wedge amount by calculation on the basis of the standard mouth piece 50, and the radial dimension L k That is the length direction dimension of the wedge-shaped mouth piece 10, such as Figure 5-6 The length dimension shown in the drawing is the difference between the inner and outer arc lengths δ of the mouth-shaped component assembly structure. s It can be obtained by following the steps below:

[0056] According to the formula Determine the outer arc length L of the mouth-shaped component combination structure outside ; Then according to the formula Determine the inner arc length L of the mouth-shaped component combination structure inside ; Then according to the formula Determine the inner and outer arc length difference δ of the mouth piece combination structure s It should be noted that the arrangement of the wedge-shaped mouth piece 10 in the shield tunnel turning section will result in the outer arc length and the inner arc length of the mouth piece combination structure being inconsistent. By determining the inner and outer arc length difference δ s This makes it easier to determine the wedge shape of each wedge-shaped mouth piece, and further facilitates the determination of the layout of the mouth piece combination structure. The turning radius corresponding to the central axis 170 of the extension direction of the mouth piece combination structure is the curvature radius of the shield tunnel turning section, that is, the minimum curvature radius R of the shield tunnel turning section. min The corresponding arc length coincides with the central axis 170 of the extension direction of the mouth-shaped component assembly structure.

[0057] S3, determining the average width B of each of the mouth pieces along the extending direction of the shield tunnel turning section, and according to the length L of the turning section tun The number N of wedge-shaped mouth pieces 10 required to be arranged in the shield tunnel turning section is determined by the average width B; it is worth noting that, since the wedge-shaped mouth piece 10 has at least one wedge-shaped surface for splicing, the width of the wedge-shaped mouth piece 10 along the extension direction of the shield tunnel turning section is a gradual value rather than a fixed value, so the average width B of each wedge-shaped mouth piece 10 along the extension direction of the shield tunnel turning section can be determined in advance, for example, the formula B=B max +B min / 2 is determined, where B max is the maximum width corresponding to the outer side 110 of the wedge-shaped mouth piece 10, B min It is the minimum width corresponding to the inner side 120 of the wedge-shaped mouth piece 10, so that the average width B can be determined.

[0058] Furthermore, in step S3, according to the length L of the turning section tun Determining the number N of wedge-shaped mouth pieces 10 required to be arranged in the shield tunnel turning section according to the average width B specifically includes the following steps:

[0059] According to the formula Determine the number N of wedge-shaped mouth pieces 10 that need to be arranged corresponding to the turning section of the shield tunnel.

[0060] S4, according to the inner and outer arc length difference δ s and the number N to determine the average wedge amount Δ of each wedge-shaped mouth piece 10; as a preferred embodiment, the step S4 specifically includes the steps of:

[0061] According to the formula Δ=k×B×L k / R minThe average wedge amount Δ of each wedge-shaped mouth piece 10 is determined, wherein k is a comprehensive correction coefficient for the wedge amount of the mouth piece. As a preferred example, the comprehensive correction coefficient k for the wedge amount of the mouth piece is set between 1.5 and 2.5.

[0062] Specifically, Δ = k × B × L k / R min The steps obtained are: Then according to the formula Δ=k×Δ′=k×B×L k / R min .

[0063] It can be seen from this that the wedge shape of each wedge-shaped mouth piece 10 is mainly affected by the average width B, the radial dimension L k and the minimum curvature radius R min impact.

[0064] S5, determining the layout form of the mouth-shaped component combination structure according to the average wedge amount Δ and the number N.

[0065] Specifically, by setting the wedge amount, the turning and precision adjustment of the shield segment mouth piece can be achieved. Figure 5-7 As shown, there are three ways to set the wedge shape of the mouth piece: a single-sided wedge-shaped mouth piece 180 (asymmetric), a double-sided wedge-shaped mouth piece 190 (symmetric), and a standard mouth piece 50. In order to achieve the turning and precision adjustment functions of the mouth piece, this application designs a mouth piece combination according to the site conditions. The layout forms of the mouth piece combination structure that can be used can be divided into single type and composite type. Among them, the single type uses only a single-sided wedge-shaped mouth piece 180 or a double-sided wedge-shaped mouth piece 190. The composite type mouth piece combination includes a single-sided wedge-shaped mouth piece + standard mouth piece 50, a double-sided wedge-shaped mouth piece + standard mouth piece 50, etc.

[0066] The layout of the mouth piece combination structure provided in the present application preferably uses only a single-sided wedge-shaped mouth piece 180 or a double-sided wedge-shaped mouth piece 190. In another embodiment, a composite mouth piece combination of double-sided wedge-shaped + standard mouth piece 50 can also be selected to achieve turning and precision adjustment of the mouth piece within the minimum curve radius of the shield.

[0067] In another preferred embodiment, the above embodiment realizes the turning of the mouth piece on the plane of the shield tunnel turning section. However, in actual engineering, the shield tunnel turning section may also need to bend in the height direction, that is, the turning of the mouth piece in the shield tunnel turning section needs to be hyperbolic (both on the plane and on the plumb plane). In response to the needs of this scenario, the turning accuracy adjustment of the mouth piece in the plumb plane of this embodiment can be adjusted in two ways. One is to calculate and set the wedge amount on the plumb plane of the mouth piece. According to the same method, the theoretical calculation formula for the vertical wedge amount of the mouth piece can be obtained:

[0068] Δvertical = k×B×H / Rvertical

[0069] Among them, Δvertical is the vertical wedge shape of the mouth piece; B is the width of the mouth piece, in mm; H is the height of the mouth piece, in mm; Rvertical is the vertical curve radius of the shield tunnel, in mm; k is the comprehensive correction coefficient of the wedge shape of the mouth piece, which is recommended to be 1.5 to 2.5.

[0070] Secondly, by adjusting the redundancy of the bolt holes, micro-mouth-shaped parts can be manually set up in the height direction to achieve vertical turning and precision adjustment of the mouth-shaped parts.

[0071] Through this embodiment, the turning and precision adjustment of the mouth piece in both the extension direction and the height direction of the shield tunnel turning section can be realized, which can further meet the needs of turning and precision adjustment of the mouth piece in the shield tunnel turning section.

[0072] As a preferred embodiment, Figure 6 As shown, the wedge-shaped mouth piece 10 includes a second wedge surface 150 and a third wedge surface 160 that are arranged opposite to each other along its width direction, wherein the first wedge surface 130 of the j-th wedge-shaped mouth piece 10 is spliced ​​with the second wedge surface 150 of the j+1-th wedge-shaped mouth piece 10, j≥1, and j is a positive integer. That is, each wedge-shaped mouth piece 10 in this embodiment includes a second wedge surface 150 and a third wedge surface 160, and the second wedge surface 150 and the third wedge surface 160 are both used to splice with adjacent wedge-shaped mouth pieces 10, for example, the second wedge surface 150 of the first wedge-shaped mouth piece 10 is spliced ​​with the third wedge surface 160 of the second wedge-shaped mouth piece 10, the second wedge surface 150 of the second wedge-shaped mouth piece 10 is spliced ​​with the third wedge surface 160 of the third wedge-shaped mouth piece 10, and so on. Furthermore, as a preferred example, the second wedge surface 150 and the third wedge surface 160 are symmetrically arranged along the simple width direction of the wedge mouth. Furthermore, as a preferred example, the wedge amount of the second wedge surface 150 and the third wedge surface 160 is set between 15 and 40 mm.

[0073] The wedge-shaped mouth piece 10 in the form of double-sided wedge surfaces provided in this embodiment can adapt to the turning requirements of the shield tunnel turning section, especially for the tunnel section with a small turning radius.

[0074] As another optional embodiment, Figure 5 As shown, the mouth piece includes a first wedge-shaped surface 130 and a flat surface 140 arranged opposite to each other along its width direction, wherein the first wedge-shaped surface 130 of the i-th mouth piece and the flat surface 140 of the i+1-th mouth piece are spliced ​​together, i≥1, i is a positive integer. That is, this embodiment also provides a wedge-shaped mouth piece 10 with only one side being a wedge-shaped surface, and the splicing surface on the other side being a flat surface 140, as shown in FIG. Figure 5 As shown, this type of wedge-shaped mouth piece 10 can also meet the turning requirements of the shield tunnel turning section. For example, the first wedge surface 130 of the first mouth piece is spliced ​​with the flat surface 140 of the second mouth piece, the first wedge surface 130 of the second mouth piece is spliced ​​with the flat surface 140 of the third mouth piece, and so on.

[0075] As another preferred embodiment, Figure 9 As shown, the second wedge surface 150 is recessed with a first tongue-and-groove at the outer side 110 near the wedge-shaped mouth piece 10, the second wedge surface 150 is recessed with a second tongue-and-groove at the inner side 120 near the wedge-shaped mouth piece 10, the third wedge surface 160 is recessed with a third tongue-and-groove at the outer side 110 near the wedge-shaped mouth piece 10, and the third wedge surface 160 is recessed with a third tongue-and-groove at the inner side 120 near the wedge-shaped mouth piece 10. Four tongue-and-groove grooves, wherein the first tongue-and-groove groove of the j-th mouth-shaped part and the third tongue-and-groove groove of the j+1-th mouth-shaped part are spliced ​​together to form a first installation groove 210 with an opening toward the outer edge 110, and the second tongue-and-groove groove of the j-th mouth-shaped part and the fourth tongue-and-groove groove of the j+1-th mouth-shaped part are spliced ​​together to form a second installation groove 220 with an opening toward the inner edge 120, and a first sealing structure 230 is installed in both the first installation groove 210 and the second installation groove 220.

[0076] For example, Figure 6 and 9As shown, for the wedge-shaped mouth piece 10 having the second wedge surface 150 and the third wedge surface 160, the second wedge surface 150 has a first tongue-and-groove recessed inwardly in the area near the outer side 110, the second wedge surface 150 has a second tongue-and-groove recessed inwardly in the area near the inner side 120, the third wedge surface 160 has a third tongue-and-groove recessed inwardly in the area near the outer side 110, and the third wedge surface 160 has a second tongue-and-groove recessed inwardly in the area near the inner side 120, that is, each wedge-shaped mouth piece 10 is formed with four tongue-and-groove recesses, for example, The first tongue-and-groove groove of the first mouth-shaped component and the third tongue-and-groove groove of the second mouth-shaped component are spliced ​​together to form a first installation groove 210 with an opening toward the outer edge 110, and the second tongue-and-groove groove of the first mouth-shaped component and the fourth tongue-and-groove groove of the second mouth-shaped component are spliced ​​together to form a second installation groove 220 with an opening toward the inner edge 120. A first sealing structure 230 is installed in both the first installation groove 210 and the second installation groove 220, so that the first sealing structure 230 can be installed in the first installation groove 210 or the second installation groove 220 to achieve effective blocking of the inner and outer sides of the wedge-shaped mouth-shaped component 10.

[0077] It should be noted that if Figure 8 As shown in the figure, the side wall joints of common mouth-shaped parts are flat seams 40, which are affected by the accuracy of on-site construction, and there are problems such as the gaps in the side wall joints of the mouth-shaped parts are too large and they are easy to be knocked and chipped. At the same time, in order to ensure the safety of shield fire, such as Figure 2 As shown, fire inspection and acceptance requirements require that there should be no airflow inside or outside the side walls of the mouth-shaped parts. To solve the above problem, this embodiment provides a tongue-and-groove on the wedge-shaped surface of each wedge-shaped mouth-shaped part 10. The first sealing structure 230 can be a fire-retardant material such as expansion cement or polysulfide sealant 232 filled in the first installation groove 210 and the second installation groove 220. In a preferred example, Figure 10 As shown, the first sealing structure 230 includes a foam rod 231 and an expansive cement filling layer or polysulfide sealant 232. The foam rod 231 is arranged at the bottom of the first installation groove 210 and the second installation groove 220 and extends along the length direction of the wedge-shaped mouth piece (the radial direction of the turning section of the shield tunnel). In this way, the inside and outside of the wedge-shaped mouth piece 10 can be sealed without affecting the stress of the wedge-shaped mouth piece 10, thereby meeting the fire safety requirements of the wedge-shaped mouth piece 10.

[0078] Furthermore, the joint between the first wedge surface 130 of the jth wedge-shaped mouth piece 10 and the second wedge surface 150 of the j+1th wedge-shaped mouth piece 10 is provided with a second sealing structure 240, and the second sealing structure 240 is provided between the first installation groove 210 and the second installation groove 220. For example, Figure 9As shown, the joint between the first wedge-shaped surface 130 of the first wedge-shaped mouth piece 10 and the second wedge-shaped mouth piece 10 is provided with a second sealing structure 240, and the second sealing structure 240 is provided between the first mounting groove 210 and the second mounting groove 220. As a preferred example, the second sealing structure 240 can be a nitrile cork rubber pad, with both ends of the nitrile cork rubber pad extending to the first mounting groove 210 and the second mounting groove 220, respectively, thereby effectively blocking the joint between the two adjacent wedge-shaped mouth pieces 10. The nitrile cork rubber pad has good wear resistance and airtightness, and can further enhance the sealing performance of the inside and outside of the wedge-shaped mouth piece.

[0079] In order to further help those skilled in the art understand the technical solution of this application, this application also provides specific examples for reference by those skilled in the art:

[0080] The target shield tunnel route is 1,555 meters long, with eight horizontal curves along the road centerline, with radii of R1 = 520 meters, R2 = 520 meters, R3 = 710 meters, R4 = 520 meters, R5 = 1,000 meters, R6 = 3,000 meters, R7 = 550 meters, and R8 = 1,650 meters. The target shield tunnel is constructed to the standards of a two-way urban trunk road, with a design speed of 50 km / h. The shield segments have an inner diameter of 14.4 meters and an outer diameter of 15.7 meters. The single wedge-shaped mouth piece 10 for this project is 1.8 meters wide and 4.0 meters long.

[0081] Calculation of average wedge volume Δ: The minimum circular curve radius R of the project min =520m, which is close to the specification limit of 500m. According to the technical solution of this application, the theoretical value of the average wedge amount Δ of this project is determined to be:

[0082] Δ=k×B×L k / R min =2*1800*4000 / 520000=27.69mm

[0083] The side wall of the mouth part of this project is 250mm thick. The first tongue-and-groove groove, the second tongue-and-groove groove, the third tongue-and-groove groove and the fourth tongue-and-groove are set on the outside of the side wall of the mouth part. The first installation groove 210 and the second installation groove 220 are filled with fire-retardant materials such as micro-expansive cement or polysulfide sealant 232, and nitrile cork rubber pads are set in the remaining flat seams 40, which effectively solves the problems of air and smoke leakage between the inside and outside of the mouth part and meets the fire protection requirements of the shield mouth part.

[0084] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A design method for a shield tunnel turning section mouth piece assembly structure, characterized in that: The mouth piece assembly structure includes a plurality of wedge-shaped mouth pieces sequentially spliced ​​along the extension direction of the shield tunnel turning section, and the method includes the steps of: S1, determine the minimum curvature radius R of the shield tunnel turning section min , and according to the minimum curvature radius R min Determine the length of the turning section L tun ; S2, determine the radial dimension L of each wedge-shaped mouth piece along the turning section of the shield tunnel k , and according to the minimum curvature radius R min and the radial dimension L k Determine the inner and outer arc length difference δ of the mouth piece combination structure s ; Wherein, the turning radius corresponding to the central axis of the extension direction of the mouth-shaped component assembly structure is the curvature radius of the turning section of the shield tunnel; S3, determining the average width B of each of the mouth pieces along the extending direction of the shield tunnel turning section, and according to the length L of the turning section tun and the average width B to determine the number N of wedge-shaped opening pieces required to be arranged in the turning section of the shield tunnel; S4, according to the inner and outer arc length difference δ s and the number N determine the average wedge amount Δ of each wedge-shaped mouth piece; S5, determining the layout form of the mouth-shaped component combination structure according to the average wedge amount Δ and the number N.

2. The design method for the combined structure of the mouth piece for the turning section of a shield tunnel according to claim 1 is characterized in that: In step S1, according to the minimum curvature radius R min Determine the length of the turning section L tun The specific steps include: Determine the turning center angle θ corresponding to the turning section of the shield tunnel; According to the formula Determine the length L of the turning section tun .

3. The design method of the mouth piece assembly structure for the shield tunnel turning section according to claim 2 is characterized in that: The step S2 specifically includes the following steps: According to the formula Determine the outer arc length L of the mouth-shaped component combination structure outside ; According to the formula Determine the inner arc length L of the mouth-shaped component combination structure inside ; According to the formula δ s =L outside -L inside Determine the inner and outer arc length difference δ of the mouth piece combination structure s .

4. The design method for the combined structure of the mouth piece for the turning section of a shield tunnel according to claim 2 is characterized in that: In step S3, according to the length L of the turning section tun Determining the number N of wedge-shaped opening pieces required to be arranged in the shield tunnel turning section based on the average width B specifically includes the following steps: According to the formula N=L tun / B determines the number N of wedge-shaped mouth pieces that need to be arranged corresponding to the turning section of the shield tunnel.

5. The design method of the mouth piece assembly structure for the shield tunnel turning section according to claim 2 is characterized in that: The step S4 specifically includes the following steps: According to the formula Δ=k×B×L k / R min Determine the average wedge amount Δ of each wedge-shaped mouth piece; where k is the comprehensive correction coefficient for the wedge amount of the mouth piece.

6. The design method for the mouth piece assembly structure for the shield tunnel turning section according to claim 5 is characterized in that: The wedge-shaped mouth piece includes a second wedge-shaped surface and a third wedge-shaped surface arranged opposite to each other along its own width direction, wherein the first wedge-shaped surface of the jth wedge-shaped mouth piece and the second wedge-shaped surface of the j+1th wedge-shaped mouth piece are spliced ​​together, j≥1, and j is a positive integer.

7. The design method for the combined structure of the mouth piece for the turning section of a shield tunnel according to claim 6 is characterized in that: The second wedge-shaped surface is recessed inwardly with a first tongue-and-groove near the outer edge of the wedge-shaped mouth piece, the second wedge-shaped surface is recessed inwardly with a second tongue-and-groove near the inner edge of the wedge-shaped mouth piece, the third wedge-shaped surface is recessed inwardly with a third tongue-and-groove near the outer edge of the wedge-shaped mouth piece, and the third wedge-shaped surface is recessed inwardly with a fourth tongue-and-groove near the inner edge of the wedge-shaped mouth piece, wherein the first tongue-and-groove of the j-th mouth piece and the third tongue-and-groove of the j+1-th mouth piece are spliced ​​together to form a first installation groove with an opening toward the outer edge, the second tongue-and-groove of the j-th mouth piece and the fourth tongue-and-groove of the j+1-th mouth piece are spliced ​​together to form a second installation groove with an opening toward the inner edge, and a first sealing structure is installed in both the first installation groove and the second installation groove.

8. The design method for the combined structure of the mouth piece for the turning section of a shield tunnel according to claim 7 is characterized in that: The joint between the first wedge surface of the jth wedge-shaped mouth piece and the second wedge surface of the j+1th wedge-shaped mouth piece is provided with a second sealing structure, and the second sealing structure is provided between the first installation groove and the second installation groove.

9. The design method for the combined structure of the mouth piece for the turning section of a shield tunnel according to claim 5, characterized in that: The comprehensive correction coefficient k of the wedge shape of the mouth piece is set between 1.5 and 2.5.

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