CN113153425A - Design method for local embedded channel of high-speed railway shield tunnel contact net foundation - Google Patents
Design method for local embedded channel of high-speed railway shield tunnel contact net foundation Download PDFInfo
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- CN113153425A CN113153425A CN202110527797.0A CN202110527797A CN113153425A CN 113153425 A CN113153425 A CN 113153425A CN 202110527797 A CN202110527797 A CN 202110527797A CN 113153425 A CN113153425 A CN 113153425A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/02—Suspension devices for tubes or the like, e.g. for ventilating ducts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/04—Distributing means for power supply in mines
- E21F17/06—Distributing electric power; Cable networks; Conduits for cables
Abstract
The invention discloses a method for designing a local embedded channel of a large-diameter shield tunnel contact net foundation of a high-speed railway, which comprises the following steps of: (1) optimizing the type of the embedded channel of the contact network, and selecting a proper type according to the requirement; (2) aiming at the design of a pipe piece structure by combining the general engineering and the functional requirements of the pre-buried channel of the contact network, and determining a pre-buried channel ring pipe piece scheme; (3) on the basis, the cross section and the longitudinal section of the segment ring of the embedded channel are arranged and designed; and (4) on the basis of the step (3), performing ring splicing design on the falling channels of different curve sections. The invention provides a method for designing local pre-buried channels of a contact net foundation of a large-diameter shield tunnel of a high-speed railway systematically for the first time, which has the advantages of wide application range, high utilization rate of the channels, capability of finishing the hanging of the contact net in the shield tunnel of the high-speed railway safely, reliably and accurately, capability of avoiding the damage to a segment structure, capability of ensuring the durability of the engineering and high application and popularization values.
Description
Technical Field
The invention relates to the field of high-speed railway shield tunnel design, in particular to a method for designing a local embedded channel of a large-diameter shield tunnel contact net foundation of a high-speed railway.
Background
The installation mode of a contact net foundation in a railway tunnel mainly comprises two modes of a post-planting anchor bolt and a pre-buried channel. The post-implantation anchor bolt is used for punching a tunnel structure and providing a fulcrum for the contact net foundation through implanting a chemical anchor bolt; the pre-buried channel means that in the process of pouring the tunnel lining, the channel is pre-buried in the structure, and a fulcrum is provided for a contact net foundation through acting force between the channel and concrete. For traditional after plant crab-bolt mode, the embedded channel has do not destroy tunnel structure, intensity is high, the durability is good, corrosion-resistant, construction advantage such as convenient, no dust, no vibrations. In recent years, the method is gradually popularized and applied in mountain tunnels and urban rail traffic, and the large-diameter railway shield tunnel still adopts a construction mode of post-planting anchor bolts. For urban rail transit projects, a full-ring pre-buried channel mode is adopted in engineering so as to meet the requirement of segment wall hanging. In contrast, the large-diameter shield tunnel of the railway has the characteristics of large tunnel diameter and pipeline entering into the groove, and the full-ring pre-embedded mode has low channel utilization rate, thereby causing great engineering waste. Therefore, for the large-diameter shield tunnel of the railway, the research of the scheme of the local embedded channel is carried out so as to promote the wide application of the basic embedded channel technology of the shield tunnel contact network of the high-speed railway and have important significance.
Disclosure of Invention
The invention provides a method for designing a local embedded channel of a large-diameter shield tunnel contact net foundation of a high-speed railway, which aims to solve the problems in the prior art.
The technical scheme of the invention is as follows: a method for designing a local pre-buried channel of a high-speed railway shield tunnel contact network foundation comprises the steps of optimizing a pre-buried channel of a contact network, designing a segment ring structure of the pre-buried channel, designing distribution of segment rings of the pre-buried channel and splicing segments of different line sections. The method specifically comprises the following steps:
(i) optimization of contact net pre-buried channel
Optimizing the type of the pre-buried channel of the contact network by combining the functional requirements of the contact network of the large-diameter tunnel of the high-speed railway, and selecting a proper type according to the requirements;
(ii) design of pre-buried channel segment ring structure
The method comprises the steps of combining engineering overview and the function requirements of the contact net pre-buried channel, designing a pipe piece structure, determining a pre-buried channel ring pipe piece scheme, and mainly determining factors such as structure blocks, pipe piece types and wedge amount.
(iii) Ring arrangement design of pre-buried channel segment
And (3) on the basis of the steps i and ii, according to the distribution requirement of a railway large-diameter shield tunnel contact network, carrying out distribution design on the cross section and the longitudinal section of the segment ring of the pre-buried channel, and mainly determining factors such as the distribution position, the longitudinal distance, the distribution quantity and the like of the segment ring of the channel ring.
(iv) Splicing design of pre-buried channel rings of different line sections
And on the basis of the step iii, for the splicing design of the falling channel rings of different curve sections, the method mainly comprises a splicing scheme principle and a splicing point selection principle.
The contact net embedded channel is optimized by optimizing six conventional channel types into two types, namely a type I channel and a type II channel, wherein the type I channel is used for hanging a contact net hanging column, hanging an additional lead and oppositely hanging the additional lead; the II-type groove is used for suspension compensation anchoring, central anchor knot anchoring and tunnel portal AF/PW line terminal anchoring.
The design of pre-buried channel section of jurisdiction loop structure includes: the pipe piece blocking combines the pipe piece diameter and the length requirement of a pre-buried channel, and a blocking mode of 'N standard blocks +2 adjacent blocks +1/3 top sealing blocks' is adopted; the duct piece type comprises a common ring duct piece and a channel ring duct piece, and the channel ring duct piece comprises a first-type channel ring duct piece and a second-type channel ring duct piece; the common ring and the channel ring are both wedge-shaped ring segments, and the wedge amount is determined by calculating the minimum curve radius of the line; in the pre-buried channel ring segment, a pre-buried channel consists of a channel anchor rod, a positioning bolt and a channel; the channel is pre-buried through processing the locating hole and installing positioning bolt on the section of jurisdiction mould, and the position of fixed channel on the section of jurisdiction template, then hoisting the section of jurisdiction steel reinforcement cage, pouring section of jurisdiction concrete, anchor through stock and channel realizes pre-buried.
The pre-buried channel segment ring arrangement design comprises: the method comprises the following steps that I, channels of a channel ring duct piece are arranged on duct piece ring fixed blocks according to turning conditions, and are arranged at fixed intervals along a line direction according to the requirements of a contact network, wherein each channel is divided into one group, and each group comprises two embedded channels; the II-type channels are arranged in a full-ring mode along the circumferential direction of the duct piece, the arrangement positions and the number of groups are determined according to the type of a contact net in the longitudinal direction, and each group of two-ring embedded channels are formed.
The splicing design of the pre-buried channel rings of different line sections comprises the following steps: the assembly scheme takes the principle of adjusting adjacent negative rings (the previous ring of the duct ring duct piece) into consideration according to the fixed duct ring duct piece so as to adapt to a straight curve of a line; in the assembly scheme, for different line sections (a left deviation curve, a right deviation curve and a straight line section), the I-shaped channel is respectively arranged on the same block of the pipe sheet ring, and the block is arranged right above the section of the tunnel; the splicing point position is considered according to the situation that the segment capping block is positioned in the upper half area of the tunnel, so that the site construction is facilitated; the splicing point position is considered according to the negative compensation without considering the wedge shape of the segment, so that repeated excessive deviation correction is avoided; the assembly point positions of adjacent negative ring pipe pieces are subjected to priority sequencing according to the principle that the wedge amount is greater than the number of through seams and the point positions of the top sealing blocks are greater than the number of through seams, and site construction is selected according to the point position priority; the assembly scheme is assembled according to staggered joints in principle, and local through joints can exist under special conditions, but the continuous condition is not suitable for exceeding two rings.
The invention provides a method for designing a local embedded channel of a large-diameter shield tunnel contact net foundation of a high-speed railway systematically for the first time, which comprises the following steps: optimizing a contact net pre-buried channel, designing a pre-buried channel segment ring structure, designing pre-buried channel segment ring arrangement, and designing segment splicing of different line sections. The invention effectively solves the defects of complicated type, low applicability, complex construction process, high requirement on the type of a pipe piece mold in a pipe piece prefabrication plant, low pipe piece assembling efficiency and the like of the existing embedded channel; meanwhile, the embedded channel is quick and convenient to install, high in utilization rate and wide in application range, hanging of a contact net in a shield tunnel of a high-speed railway can be completed safely, reliably and accurately, duct piece quality and forming appearance can be effectively guaranteed, and the embedded channel is easy to popularize and use.
Drawings
FIG. 1 is a cross-sectional view of a shield tunnel according to an example of the present invention;
FIG. 2 is a schematic view of a duct ring segment of the invention;
FIG. 3 is a schematic view of a II-channel ring segment of the present invention;
FIG. 4 is a schematic diagram of burying a pre-buried channel according to the present invention;
FIG. 5 is a schematic view of the installation of a hanging post of the I-shaped channel overhead line system in the invention;
FIG. 6 is a schematic diagram of the suspension installation of an additional line of the I-shaped channel overhead line system in the invention;
FIG. 7 is a schematic view of an additional wire pair down anchor of the I-shaped channel catenary of the present invention;
FIG. 8 is a schematic view of the suspension compensation lower anchor installation of a II-type channel catenary of the present invention;
FIG. 9 is a diagram of an example of the longitudinal arrangement of the novel pre-buried channel in the invention;
FIG. 10 is an example of a right-hand curved segment assembly of a wedge-shaped channel ring segment according to the present invention;
Detailed Description
The invention is explained in detail below with reference to the accompanying drawings and embodiments, wherein the shield tunnel scheme is shown in figure 1, the shield segment is designed at a speed of 120km/h per hour, the inner diameter of the pipe segment is 11.1m, the outer diameter is 12.2m, the ring width is 2m, the minimum curve radius is 800m, and the designed wedge amount is 64 mm.
As shown in fig. 2-10, a method for designing a local pre-buried channel of a large-diameter shield tunnel contact network foundation of a high-speed railway comprises optimization of a pre-buried channel of the contact network, segment ring structure design of the pre-buried channel, segment ring arrangement design of the pre-buried channel and segment assembly design of different line sections. The method specifically comprises the following steps:
(i) optimization of contact net pre-buried channel
Combining a railway mountain tunnel contact net channel pre-buried scheme, aiming at the annular pre-buried channel, dividing the pre-buried channel into 6 types according to functions according to the related requirements of the tunnel shield segment contact net, wherein the parameters of the functions, the lengths, the arrangement intervals and the like are shown in a table 1.
TABLE 1 Pre-buried channel arrangement principle and usage
According to the distribution position and length of the contact net function requirement and the embedded channel, the embedded segment ring is simplified into two types, namely an I-type channel ring segment and an II-type channel ring segment, as shown in figures 2 and 3. The I-shaped channel ring pipe piece is 3.5m long in channel, the layout scheme is shown in figure 4, and the I-shaped channel ring pipe piece is mainly used for overhead line system hanging column suspension, additional lead suspension and opposite anchoring of additional leads, and is shown in figures 5-7; the II-type channel ring segment is used for contact net suspension compensation anchoring, central anchor knot anchoring and AF/PW line terminal anchoring, and is shown in figure 8. The contact net foundation is connected with the embedded channel through a bolt, and the hanging of the structure is achieved.
(ii) Design of pre-buried channel segment ring structure
The segment blocking adopts a blocking mode of '5 standard blocks +2 adjacent blocks +1/3 capping blocks' by combining the segment diameter with the length requirement of a pre-buried channel.
The duct piece comprises a common ring duct piece and a channel ring duct piece, and the channel ring duct piece comprises an I-type channel ring duct piece and an II-type channel ring duct piece.
The common ring and the channel ring both adopt wedge-shaped ring segments;
the wedge-shaped amount of the pipe piece is determined by calculating the minimum curve radius of the line, and the calculated value of the wedge-shaped amount is 48 mm.
In the pre-buried channel ring segment, a pre-buried channel consists of a channel anchor rod, a positioning bolt and a channel; the channel is pre-buried through processing the locating hole and installing positioning bolt on the section of jurisdiction mould, and the position of fixed channel on the section of jurisdiction template, then hoist and mount section of jurisdiction steel reinforcement cage, pour section of jurisdiction concrete, the anchor through stock and channel realizes pre-buried.
(iii) Ring arrangement design of pre-buried channel segment
The I-shaped channel ring duct piece arranges channels on the duct piece ring fixing blocks according to turning conditions and directly above the section, and one channel is arranged every 24m along the line direction, wherein each channel is in a group, and two channels are embedded in each group. Such as type a in fig. 9.
The II-type channels are arranged in a full ring along the circumferential direction of the duct piece, the arrangement positions and the number of groups are determined according to the type of the contact network in the longitudinal direction, the contact network suspension compensation lower anchors are arranged at one position every 1200m, two groups are arranged at each position, and each group is provided with two-ring embedded channels; one part is arranged between each anchor section of the central anchor of the contact network, each part is provided with one group, and each group is provided with two rings of pre-buried channels; and the AF/PW line terminals are arranged at the entrance and the exit of the tunnel in an anchoring manner, and each AF/PW line terminal is arranged in a group, and each group is provided with two rings of pre-embedded channels. Such as type B in fig. 9.
(iv) Splicing design of pre-buried channel rings of different line sections
And (5) on the basis of the step iii, considering according to the principle of adjusting the adjacent negative ring (the previous ring of the channel ring duct piece) of the fixed channel ring duct piece so as to adapt to the straight curve of the line.
In the assembly scheme, for different line sections (a left deviation curve, a right deviation curve and a straight line section), the I-shaped grooves are respectively arranged in the same block of the pipe sheet ring, and the block is arranged right above the section of the tunnel.
And (4) assembling point positions (K block point positions), and considering according to the fact that the segment capping blocks are located in the upper half area of the tunnel, so that site construction is facilitated.
The splicing point position does not consider the negative compensation of the wedge shape of the pipe piece so as to avoid repeated over-correction,
and in the assembly point positions, the adjacent negative ring pipe pieces are subjected to priority sequencing according to the principle that the wedge amount is greater than the number of through seams and the point positions of the capping blocks are greater than the number of through seams, and the site construction is selected according to the point position priority.
The assembly scheme is assembled according to staggered joints in principle, and local through joints can exist under special conditions that the shield machine cannot turn when the shield gap is too small, but the number of the through joints is continuously less than two.
Combining the field construction situation, according to the principle, taking a right-hand curve as an example, the assembling scheme is described, and the assembling scheme is shown in fig. 10, wherein the outer ring segment is an I-shaped channel ring segment, and the inner ring segment is a negative ring segment. I type channel ring section of jurisdiction is selected the channel and is laid in A5 piecing, and negative ring section of jurisdiction K piece is assembled the position and is 1 ~ 13, 21, 22, assembles scheme control parameter statistics and sees table 2. When the duct pieces are assembled, the duct pieces are assembled according to staggered joints in principle, and local through joints can exist under special conditions, but the number of the through joints is continuously less than two. According to the priority principle of wedge amount, through seam number and top sealing block point positions, the negative ring pipe piece assembling point positions are sorted according to the priority order of 3>2>21>22>4> 1.
TABLE 2 Deviational Curve Assemble scheme control parameter statistics
The comprehensive comparison and selection result is that I-shaped embedded channels for the right deviation curve are arranged in a standard block A5; for negative one-ring segment assembly, factors such as wedge-shaped amount, through joint quantity, capping block point positions and the like are integrated, and the capping block point positions are considered according to the following priority: 3>2>21>22>4> 1.
Similarly, for the left deviation curve, the embedded channel is arranged in the block A1; the assembling point positions of the K blocks of the negative ring duct piece are considered according to the following priority: 9>13>10>12>4> 11. For straight line segments, the embedded channels can be arranged on the blocks A5, A1, B1 and B2, and the embedded channels are proposed to be arranged on the blocks A5 and A1 by combining the analysis results of a left deviation curve and a right deviation curve, the number is considered according to each half, and the assembling point positions of the negative ring pipe pieces are considered according to the following priority: the K block point is arranged at 12 points when the A5 block is pre-buried, and the K block point 2 is more than 22 when the A1 block is pre-buried.
The invention provides a method for designing a local pre-buried channel of a large-diameter shield tunnel contact net foundation of a high-speed railway systematically for the first time, and the method effectively overcomes the defects of complicated types, low applicability, complex construction process, high requirement on the type of a pipe sheet mold in a pipe sheet prefabrication plant, low pipe sheet assembling efficiency and the like of the existing pre-buried channel; the method has the advantages of wide application range, high channel utilization rate, capability of safely, reliably and accurately completing the hanging of the contact net in the shield tunnel of the high-speed railway, capability of avoiding the damage to the segment structure, capability of ensuring the durability of the engineering, and very high application and popularization values.
Claims (5)
1. A method for designing a local embedded channel of a shield tunnel contact network foundation of a high-speed railway is characterized by comprising the steps of optimizing an embedded channel of the contact network, designing a segment ring structure of the embedded channel, designing segment ring arrangement of the embedded channel and splicing segments of different line sections; the method comprises the following steps:
(i) optimization of contact net pre-buried channel
Optimizing the type of the pre-buried channel of the contact network by combining the functional requirements of the contact network of the large-diameter tunnel of the high-speed railway, and selecting a proper type according to the requirements;
(ii) design of pre-buried channel segment ring structure
Aiming at the design of a segment structure by combining the general engineering and the functional requirements of the contact network embedded channel, and determining an embedded channel ring tube segment scheme, wherein the scheme comprises the determination of structural blocks, segment types and wedge-shaped quantity factors;
(iii) ring arrangement design of pre-buried channel segment
On the basis of the steps i and ii, according to the distribution requirement of a railway large-diameter shield tunnel contact net, the distribution design of the cross section and the longitudinal section of the pre-buried channel segment ring is carried out, and the distribution design comprises the determination of the factors of the distribution positions, the longitudinal intervals and the distribution quantity of the channel ring segments in blocks;
(iv) splicing design of pre-buried channel rings of different line sections
And (5) on the basis of the step iii, for the splicing design of the falling channel rings of different curve sections, the splicing scheme principle and the splicing point position selection principle are included.
2. The method for designing the local embedded channel of the high-speed railway shield tunnel contact network foundation according to claim 1, wherein the embedded channel of the contact network is optimized by optimizing conventional six types of channels into two types, namely a type I channel and a type II channel, wherein the type I channel is used for hanging a suspension column of the contact network, hanging an additional wire and oppositely hanging the additional wire; the II-type groove is used for suspension compensation anchoring, central anchor knot anchoring and tunnel portal AF/PW line terminal anchoring.
3. The method for designing the local embedded channel of the high-speed railway shield tunnel contact network foundation according to claim 1, wherein the design of the segment ring structure of the embedded channel comprises the following steps:
the method comprises the following steps of (1) segment blocking, wherein a blocking mode of 'N standard blocks +2 adjacent blocks +1/3 capping blocks' is adopted by combining the diameter of a segment with the length requirement of a pre-buried channel;
the duct piece comprises a common ring duct piece and a channel ring duct piece, wherein the channel ring duct piece comprises a first-type channel ring duct piece and a second-type channel ring duct piece;
the common ring and the channel ring both adopt wedge-shaped ring segments;
the wedge-shaped amount of the duct piece is determined by calculating the minimum curve radius of the line;
in the pre-buried channel ring segment, a pre-buried channel consists of a channel anchor rod, a positioning bolt and a channel; the channel is pre-buried through processing the locating hole and installing positioning bolt on the section of jurisdiction mould, and the position of fixed channel on the section of jurisdiction template, then hoist and mount section of jurisdiction steel reinforcement cage, pour section of jurisdiction concrete, anchor through stock and channel realizes pre-buried.
4. The method for designing the local embedded channel of the high-speed railway shield tunnel contact network foundation according to claim 1, wherein the segment ring arrangement design of the embedded channel comprises the following steps:
the I-shaped channel ring duct piece arranges a channel on a duct piece ring fixing block according to the turning condition; the embedded channels are arranged at fixed intervals along the line direction according to the requirements of a contact network, and each embedded channel is divided into one group and two groups;
the II-type channels are arranged in a full ring along the circumferential direction of the duct piece, the arrangement position and the number of groups are determined according to the type of a contact net in the longitudinal direction, and each group of two-ring embedded channels are formed.
5. The method for designing the local embedded channel of the high-speed railway shield tunnel contact net foundation according to claim 1, wherein the assembling design of the embedded channel rings of different line sections comprises the following steps:
the assembly scheme is considered according to the principle of adjusting adjacent negative rings of the fixed channel ring duct piece so as to adapt to a straight curve of a line;
in the assembly scheme, for different line sections, I-shaped channels are respectively arranged in the same block of the pipe sheet ring, and the block is arranged right above the section of the tunnel;
assembling point positions, wherein the point positions are considered according to the situation that the segment top sealing block is positioned in the upper half area of the tunnel, so that field construction is facilitated;
the splicing point position does not consider the negative compensation of the wedge shape of the segment, so that repeated excessive deviation correction is avoided;
in the assembly point positions, the adjacent negative ring pipe pieces are subjected to priority sequencing according to the principle that the wedge amount is greater than the number of through seams and the point positions of the top sealing blocks are greater than the number of through seams, and field construction is selected according to the point position priority;
the assembly scheme is assembled according to staggered joints in principle, and local through joints can exist under special conditions that the shield machine cannot turn when the shield gap is too small, but the number of the through joints is not more than two.
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| CN110905549A (en) * | 2019-12-30 | 2020-03-24 | 中国电建集团铁路建设有限公司 | Three-dimensional typesetting design method and device for shield tunnel universal ring segment, storage medium and equipment |
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2021
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|---|---|---|---|---|
| US20030089828A1 (en) * | 2001-11-09 | 2003-05-15 | Rick Korczak | Anchor rail adapter and hanger and method |
| US20130099068A1 (en) * | 2011-10-21 | 2013-04-25 | Donna E. Lacour | Pipe hanger assembly |
| CN106401643A (en) * | 2016-08-31 | 2017-02-15 | 铁道第三勘察设计院集团有限公司 | Tunnel back-break detection method based on laser-point cloud |
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| CN113153425B (en) | 2023-02-28 |
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