CN114922646B - Ultra-small radius gentle curve segment shield cutting line starting construction method - Google Patents
Ultra-small radius gentle curve segment shield cutting line starting construction method Download PDFInfo
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- CN114922646B CN114922646B CN202210351196.3A CN202210351196A CN114922646B CN 114922646 B CN114922646 B CN 114922646B CN 202210351196 A CN202210351196 A CN 202210351196A CN 114922646 B CN114922646 B CN 114922646B
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- 238000010276 construction Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 35
- 230000008014 freezing Effects 0.000 claims abstract description 22
- 238000007710 freezing Methods 0.000 claims abstract description 22
- 230000005641 tunneling Effects 0.000 claims abstract description 13
- 238000013461 design Methods 0.000 claims abstract description 10
- 230000002787 reinforcement Effects 0.000 claims abstract description 10
- 230000000977 initiatory effect Effects 0.000 claims description 17
- 238000012937 correction Methods 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/087—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21F17/18—Special adaptations of signalling or alarm devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a method for constructing shield cut line starting of an ultra-small radius gentle curve segment, which aims to solve the technical problem that the existing ultra-small radius gentle curve segment shield starting posture is out of limits. The invention comprises the following steps: 1) design of a shield cutting line starting line, 2) end freezing reinforcement, 3) positioning and installing a starting table and a reaction frame, 4) installing a negative ring pipe slice, 5) chiseling a tunnel portal, 6) shield starting tunneling and 7) fitting of a shield machine deviation correcting line. The beneficial technical effects of the invention are as follows: the problem that the shield starting posture of the ultra-small radius relaxation curve segment is difficult to control and adjust is effectively solved, and the influence of the small radius relaxation curve segment on shield starting construction is reduced.
Description
Technical Field
The invention relates to the technical field of shield initiation, in particular to a shield secant initiation construction method for an ultra-small radius gentle curve segment.
Background
In the construction process of underground urban rail transit, shield initiation usually adopts straight line or tangent line initiation. However, when the shield start is in a small radius curve segment, the problems of difficult control of the shield start posture, poor segment installation quality, overrun of ground subsidence and the like are easily caused by the adoption of a straight line start or tangent line start method. Meanwhile, in the shield launching process, the pressure cannot be normally built in a front soil bin or a muddy water bin for blocking the tunnel gate under the influence of tunnel gate sealing, so that the thrust is smaller and the posture adjustment requirement cannot be met. Therefore, the horizontal attitude of the shield is straight-line propulsion before the opening is blocked. Especially, when the small-radius curve segment starts, the phenomenon that the posture of the shield machine exceeds the design requirement is very easy to occur, and even the design line needs to be adjusted to ensure the subsequent normal use of the shield tunnel.
Disclosure of Invention
The invention provides a method for constructing shield cut line starting of an ultra-small radius gentle curve segment, which aims to solve the technical problem that the existing ultra-small radius gentle curve segment shield starting posture is out of limits.
In order to solve the technical problems, the invention adopts the following technical scheme:
The method for constructing the shield cut line starting of the ultra-small radius gentle curve segment comprises the following steps:
1) Designing a shield secant starting line: taking the central position of the tunnel portal as a starting point of a secant starting line, taking the fact that the shield tail completely enters the reinforcing area as a finishing point of the secant starting line, and taking a straight line between the two points as the secant starting line; according to the parameters of the shield machine, the length of an originating bracket and the arrangement angle of a freezing pipe, the central coordinate fitting of a shield originating tunnel is used for determining the originating line of a shield secant, a mathematical calculation model is built according to the geometric relation of the originating posture of the shield secant of a small-radius curve section, and the originating secant and the designed tunnel centerline pretilt angle, the maximum offset and the shield tail pretilt angle are calculated and determined.
2) Freezing and reinforcing the starting end: the shield starting end adopts a cup-shaped horizontal freezing reinforcement mode, the thickness of the cup bottom is not less than 3.5m, the thickness of the cup wall is 2.0m, and the longitudinal length is not less than 12.0m. Before freezing and reinforcing, according to the spatial position of the shield line cutting initiation line freezing pipe layout designed in the step 1, the unconfined compressive strength of the reinforced soil body is not less than 3.6MPa, the tensile strength is not less than 2MPa, and the bending strength is not less than 1.6MPa.
3) Starting table and reaction frame positioning and mounting: and (3) positioning, lofting and rechecking the space positions of the starting platform and the counter-force frame according to the shield line cutting starting line designed in the step (1), so as to ensure that the space positions of the starting platform and the counter-force frame meet the requirement of the shield line cutting starting line.
4) And (3) mounting a negative ring pipe piece: and determining the number of the negative ring pipe slices according to the structure sizes of the shield tunneling machine and the originating well and installing the negative ring pipe slices.
5) And (3) chiseling a tunnel portal: the building envelope at the originating portal is manually chiseled, the chiseling is performed in the sequence from top to bottom and from the middle to two sides, the chiseling range is the building envelope in the reserved portal contour line, when the portal chiseling construction is performed, a slurry spraying machine and slurry spraying are prepared, and once the working face has the sign of instability, slurry spraying is performed immediately to seal the working face.
6) Tunneling the shield: and setting various parameters of shield initiation according to shield line initiation lines, different geological conditions, ground conditions and the like, and ensuring the safety of shield initiation tunneling.
7) Correction line fitting of shield machine
And (3) according to the shield secant starting line determined in the step (1), a least square method is applied to design and fit the shield machine deviation correcting line, so that deviation between the deviation correcting line and a tunnel design curve is minimized. And according to the end freezing and reinforcing parameters, correcting the deviation after the cutter head of the shield machine is separated from the end freezing and reinforcing region. Let the start deviation correcting time of the shield machine be t 1 and the center coordinate of the cutterheadThe maximum moment of deviation rectifying offset of the shield machine is t 2, and the center coordinate of the cutter disc is/>The correction completion time is t 3, and the center coordinate of the cutterhead is。
The least square method deviation rectifying circuit fitting function is as follows:
；
The method can be obtained by solving the following equation:
；
and substituting the center coordinates of the cutter discs at different moments into the formula 1 and the formula 2 respectively, and obtaining the coefficient of the fitting curve of the correction circuit by using a simultaneous equation to determine the correction circuit.
The starting direction of the shield machine and the design center line of the shield tunnel form an angle theta, the deviation distance between the tail part of the shield machine and the arc-shaped path during starting is x, and the maximum deviation between the shield machine and the arc-shaped path during starting is y, wherein the angle theta is formed between the starting direction of the shield machine and the design center line of the shield tunnel, the deviation distance between the tail part of the shield machine and the arc-shaped path during starting is x， />， />L is the length of the shield body, and R is the radius of the arc-shaped path.
Compared with the prior art, the invention has the beneficial technical effects that:
1. The method effectively solves the problem that the shield starting posture of the ultra-small radius eased curve segment is difficult to control and adjust, and ensures that the shield machine posture meets the standard requirements in the shield starting process.
2. The invention effectively avoids the problems of poor segment splicing quality, tunnel portal leakage, overrun of earth surface subsidence and the like existing in the curve segment shield initiation, and ensures the shield tunnel forming quality.
3. The method reduces the influence of the small-radius gentle curve section on shield starting construction, greatly improves the construction efficiency, saves the construction cost and shortens the construction period.
Drawings
FIG. 1 is a schematic diagram of the shield line cutting method initiation construction of the ultra-small radius gentle curve segment.
FIG. 2 is a view of a tip freeze-strengthening freeze hole arrangement.
FIG. 3 is a schematic view of a sequence of the hole door removing construction.
In the figure, 1 is an originating well, 2 is an ideal arc path, 3 is a secant path, 4 is a deviation correcting path, 5 is a tunneling path, x is the distance between the tail of a shield and the secant path in the originating process, y is the maximum distance between the shield machine and the secant path in the originating process, and θ is the included angle between the secant path and the design center line of the shield tunnel.
Detailed Description
The following examples are given to illustrate the invention in detail, but are not intended to limit the scope of the invention in any way.
Example 1: the construction method for initiating the shield cut line of the ultra-small radius gentle curve section, see fig. 1, comprises the following steps:
(1) Design of shield secant starting line
The shield starting is in an ultra-small radius gentle curve segment, the conventional tangent starting method cannot meet the requirement, and the line type of the tangent line is adopted for starting. And fitting and determining a shield secant starting line according to the shield machine parameters, the starting bracket length and the freezing pipe layout angle and the center coordinates of the shield starting tunnel. And establishing a mathematical calculation model according to the geometric relation of the initial posture of the shield cut line of the small-radius curve segment, and calculating and determining the initial cut line and the designed tunnel centerline pre-deflection angle, the maximum offset and the shield tail pre-deflection angle. Referring to an ideal arc-shaped path 2 in fig. 1, the starting direction of the shield machine and the design center line of the shield tunnel form an angle theta, at the moment, the deviation between the tail of the shield and the design axis is x, and after the shield machine is linearly pushed for 12m, the maximum deviation between the posture of the shield machine and the design axis is y, wherein both x and y are required to meet the requirement of standard design.
(2) End freezing reinforcement
The shield starting end adopts a cup-shaped horizontal freezing reinforcement mode, the thickness of the cup bottom is not less than 3.5m, the thickness of the cup wall is 2.0m, and the longitudinal length is not less than 12.0m. Before freezing and reinforcing, according to the spatial position of the arrangement of the freezing pipe of the shield secant starting line designed in the step (1), the unconfined compressive strength of the reinforced soil body is not less than 3.6MPa, the tensile strength is not less than 2MPa, the bending strength is not less than 1.6MPa, and the influence of the position of a freezing hole in the range of a tunnel portal on shield starting is ensured. Referring to FIG. 2, the longitudinal length of the initiation end freeze reinforcement zone is 12m from the edge of the building envelope wall, wherein the "cup bottom" thickness is 3.62m for the left line, 3.68m for the right line, and 2.0m for the "cup wall". The freezing holes at the cup bottom of the starting end are respectively arranged with one circle along the phi 2.6m and the phi 5.2m of the hole center, the number of the freezing holes is 25, and the number of the freezing holes is 1 at the circle center; the freezing holes of the cup wall are arranged in a circle along the phi 7.8m, the distance between the holes is 0.765m, the number of the freezing holes is 32, and the effective freezing length is not less than 12m.
(3) Positioning and mounting of starting table and reaction frame
And (3) positioning, lofting and rechecking of the originating platform and the counter-force frame are carried out according to the shield secant originating line designed in the step (1), so that the installation space positions of the originating platform and the counter-force frame are ensured to meet the requirements of the shield secant originating line. And determining the space position of an originating bracket according to the originating line of the determined shield cutting line, and placing the center of the originating bracket at an angle theta with the center of the tunnel portal to ensure that the center of the originating bracket coincides with the originating line of the determined shield cutting line. In order to prevent the phenomenon of head planting of the shield machine in the starting process, the mounting elevation of the starting bracket is raised by 20mm compared with the fixed elevation, the distance between the forefront end of the starting bracket and the outer edge of the starting tunnel portal is reduced, and the cutter head is ensured to be separated from the starting bracket and then can quickly jack into soil.
(4) Negative ring pipe piece installation
And determining the number of the negative ring pipe slices according to the structure sizes of the shield tunneling machine and the originating well and installing the negative ring pipe slices.
(5) Chisel for opening door
The building envelope at the originating portal is manually chiseled, the chiseling is performed in the order from top to bottom and from the middle to two sides, and the chiseling range is the building envelope in the reserved portal contour line. Referring to fig. 3, the tunnel portal chisel is sequentially performed in a numerical sequence in two stages, wherein the first stage chisel is performed from top to bottom after the reinforcement and inspection of the soil body of the end well are qualified, the second stage chisel is performed from top to bottom after the starting conditions are met, in order to prevent water and sand gushes during starting, the periphery of the tunnel portal is required to be sealed before shield starting, and shield starting tunneling is started after the sealing device is installed.
(6) Shield initial tunneling
After the tunneling route is determined, setting various parameters of shield initiation according to the shield secant initiation route, different geological conditions, ground conditions and the like, and ensuring the safety of shield initiation tunneling.
(7) Correction line fitting of shield machine
And (3) after the cutter head of the shield machine is separated from the end freezing reinforcement area, correcting the shield tunneling line, and fitting the correcting line according to the least square method principle. Set the center coordinates of the cutter disc at different moments on the deviation correcting curve asThe least square method deviation correcting curve fitting polynomial is:
(1)
for equation (1), the coefficients of the least squares solution Can be obtained by solving the equation of the method shown in the formula (2):
(2)
for (2), take The corresponding normal equation is:
Accordingly, the correction curve fitting polynomial can be obtained by solving In the followingThe known quantity of the function to be fitted can be substituted into the related elements in the general matrix representation of the equation shown in the formula 2 to obtain the required fitting curve when the method is applied specifically. And then the shield tunneling machine advances along the curve to finish initiation.
While the present invention has been described in detail with reference to the drawings and the embodiments, those skilled in the art will understand that various specific parameters in the above embodiments may be changed without departing from the spirit of the invention, and a plurality of specific embodiments are all common variation ranges of the present invention and will not be described in detail herein.
Claims (7)
1. A shield line cutting method initiation construction method for an ultra-small radius gentle curve segment is characterized by comprising the following steps:
(1) Determining an arc path between a shield starting point and a shield ending point, wherein the arc path is tangent to a shield working straight line path;
(2) The shield machine starts from the starting well, advances along the secant direction of the arc-shaped path, rectifies the secant direction after passing through the reinforcing area in front of the starting well, so that the advancing direction of the shield machine is fitted to the shield working straight-line path, the rectifies adopt a least square method, and the center coordinate of the cutter disc at the moment t is as follows
（1）
Wherein,The coefficient of the least square solution is obtained by the formula (2)
(2)
Wherein: To satisfy the coefficient of least squares solution of the correction curve function,/> Is {1, t,/>、/>Value corresponding to }/>Is AND/>And f is the known quantity of the center coordinates of the cutter disc at different moments when the correction curve is needed to be fitted.
2. The method for constructing the shield cut line method for the ultra-small radius gentle curve segment according to claim 1, wherein a cup-shaped horizontal freezing reinforcement mode is adopted in the reinforcement area in front of the originating well, the thickness of the cup bottom is not less than 3.5m, the thickness of the cup wall is 2.0m, the longitudinal length is not less than 12.0m, the unconfined compressive strength of the reinforced soil body is not less than 3.6MPa, the tensile strength is not less than 2MPa, and the bending strength is not less than 1.6MPa.
3. The method for constructing the shield line cutting method for the ultra-small radius gentle curve segment according to claim 1, wherein the space positions of the starting platform and the counter-force frame are determined according to the starting line of the shield line cutting and the center position of the steel ring of the tunnel portal, and measurement lofting is carried out, and the deviation of the space positions of the starting platform and the counter-force frame is measured and rechecked after the starting platform and the counter-force frame are installed.
4. The method for constructing the shield line cutting method of the ultra-small radius gentle curve segment according to claim 1, wherein the space position of an originating bracket is determined according to an originating line of the shield line cutting, the center of the originating bracket is guaranteed to coincide with an originating line of a fixed shield line cutting, the installation elevation of the originating bracket is higher than the fixed elevation, the distance between the forefront end of the originating bracket and the outer edge of an originating tunnel portal is reduced, and the cutter head can be quickly jacked into soil after being separated from the originating bracket.
5. The method for constructing the shield line cutting method of the ultra-small radius gentle curve segment according to claim 1, wherein the shield needs to be sealed on the periphery of a tunnel gate before the shield starts from an originating well, and the shield is started to start tunneling after the sealing device is installed.
6. The method for constructing the ultra-small radius gentle curve segment shield cut line method according to claim 1, wherein the shield tail is completely driven into the initial well portal and then the portal is chiseled in two stages, the first stage chiseling is performed from top to bottom after the reinforcement test of the end well soil mass is qualified, and the second stage chiseling is performed from top to bottom after the initial condition is met.
7. The method for constructing an ultra-small radius gentle curve segment shield cut line method according to claim 1, wherein the shield machine starting direction forms an angle θ with the shield tunnel design centerline, the deviation distance of the shield machine tail from the arc-shaped path during starting is x, and the maximum deviation of the shield machine from the arc-shaped path during starting is y, wherein，，/>L is the length of the shield body, and R is the radius of the arc-shaped path.
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| CN202210351196.3A CN114922646B (en) | 2022-04-02 | 2022-04-02 | Ultra-small radius gentle curve segment shield cutting line starting construction method |
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| CN202210351196.3A CN114922646B (en) | 2022-04-02 | 2022-04-02 | Ultra-small radius gentle curve segment shield cutting line starting construction method |
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| CN114922646B true CN114922646B (en) | 2024-05-14 |
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| CN114922646A (en) | 2022-08-19 |
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