CN114922646A - Shield cutting line starting construction method for ultra-small radius moderate curve segment - Google Patents
Shield cutting line starting construction method for ultra-small radius moderate curve segment Download PDFInfo
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- CN114922646A CN114922646A CN202210351196.3A CN202210351196A CN114922646A CN 114922646 A CN114922646 A CN 114922646A CN 202210351196 A CN202210351196 A CN 202210351196A CN 114922646 A CN114922646 A CN 114922646A
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- 230000008014 freezing Effects 0.000 claims abstract description 23
- 238000007710 freezing Methods 0.000 claims abstract description 23
- 230000005641 tunneling Effects 0.000 claims abstract description 20
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 28
- 230000002787 reinforcement Effects 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 230000007704 transition Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000036544 posture Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000287196 Asthenes Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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 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 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
Abstract
The invention discloses a construction method for starting a shield cutting line of an ultra-small radius moderate curve segment, which aims to solve the technical problem that the starting attitude of the existing ultra-small radius moderate curve segment shield exceeds the limit. The invention comprises the following steps: 1) designing a shield cutting line starting line, 2) freezing and reinforcing an end, 3) positioning and mounting a starting platform and a reaction frame, 4) mounting a negative ring pipe piece, 5) chiseling a tunnel portal, 6) tunneling shield starting, and 7) fitting a deviation-correcting line of a shield machine. The beneficial technical effects of the invention are as follows: the problem that the starting attitude of the shield at the ultra-small radius transition curve section is difficult to control and adjust is effectively solved, and the influence of the small radius transition curve section on the starting construction of the shield is reduced.
Description
Technical Field
The invention relates to the technical field of shield starting, in particular to a shield cutting line starting construction method for an ultra-small radius moderate curve segment.
Background
In the construction process of underground urban rail transit, the shield launching usually adopts straight line or tangent line launching. However, when the shield starting is in a small-radius curve segment, the problems of difficult control of the shield starting attitude, poor segment installation quality, over-limit ground surface settlement and the like are easily caused by applying a straight line starting or tangent line starting method. Meanwhile, in the starting process of the shield, the pressure cannot be built normally in a soil bin or a muddy water bin in front of the blocking tunnel portal due to the influence of tunnel portal sealing, so that the thrust is small and the posture adjustment requirement cannot be met. Therefore, the horizontal postures originated from the anterior shield for tunnel portal blockage are all linearly propelled. Particularly, when a small-radius curve segment is started, the phenomenon that the posture of the shield tunneling 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 shield cutting line starting construction method for an ultra-small radius easement curve segment, which aims to solve the technical problem that the starting attitude of the shield of the existing ultra-small radius easement curve segment is out of limit.
In order to solve the technical problem, the invention adopts the following technical scheme:
designing a shield cutting line starting construction method for an ultra-small radius moderate curve segment, comprising the following steps of:
1) designing a starting line of a shield cutting line: taking the central position of the portal as the starting point of the cutting line starting line, taking the shield tail completely entering the reinforcement area as the ending point of the cutting line starting line, and taking a straight line between the two points as the cutting line 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 of a shield originating tunnel is fitted to determine an originating line of a shield cutting line, a mathematical calculation model is established according to the geometrical relation of originating postures of the shield cutting line of a small-radius curve segment, and a pre-deflection angle, a maximum offset and a shield tail pre-deflection angle between the originating cutting line and the designed tunnel are calculated and determined;
2) freezing and reinforcing the starting end: the shield starting end adopts a cup-shaped horizontal freezing and reinforcing mode, the thickness of a cup bottom is not less than 3.5m, the thickness of a cup wall is 2.0m, and the longitudinal length is not less than 12.0 m. Before freezing reinforcement is carried out, according to the spatial position of the arrangement of the freezing pipe of the starting line of the shield cutting 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, and the bending strength is not less than 1.6 MPa;
3) the starting station and the reaction frame are positioned and installed: positioning, lofting and rechecking the spatial positions of an originating station and a reaction frame according to the shield cutting line originating line designed in the step 1, and ensuring that the mounting spatial positions of the originating station and the reaction frame meet the requirements of the shield cutting line originating line;
4) installing a negative ring pipe piece: determining the number of the negative ring pipe pieces according to the structural sizes of the shield tunneling machine and the starting well and installing the negative ring pipe pieces;
5) chiseling a hole door: chiseling the enclosure structure at the initial portal manually, wherein the chiseling is performed from top to bottom and from the middle to two sides in sequence, the chiseling range is the enclosure structure in the reserved portal contour line, a shotcrete machine and guniting materials are prepared during portal chiseling construction, and once the working face shows instability, the guniting is immediately performed to seal the tunnel face;
6) shield initial tunneling: various parameters of shield starting are set according to a shield cutting line starting line, different geological conditions, ground conditions and the like, so that the shield starting and tunneling safety is ensured.
7) Shield tunneling machine deviation rectifying line fitting
And (2) according to the shield secant starting line determined in the step (1), designing and fitting the deviation-correcting line of the shield machine by using a least square method so as to minimize the deviation between the deviation-correcting line and a tunnel design curve. And according to the freezing and reinforcing parameters of the end head, the cutter head of the shield machine begins to rectify the deviation after being separated from the freezing and reinforcing area of the end head. Setting the moment of starting deviation rectification of the shield tunneling machine as t 1 The center coordinate of the cutter head is
The maximum deviation correcting offset moment of the shield tunneling machine is t 2 The center coordinate of the cutter head is
The completion time of rectification is t 3 The center coordinate of the cutter head is
The least square method deviation correcting line fitting function is as follows:
a 0 、a 1 、a 2 、a 3 the method can be solved by the following equation:
and (3) respectively substituting the central coordinates of the cutterhead at different moments into a formula 1 and a formula 2, and solving the coefficient of the deviation rectifying line fitting curve by using a simultaneous equation to determine the deviation rectifying line.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the method effectively solves the problem that the starting attitude of the shield with the ultra-small radius transition curve section is difficult to control and adjust, and ensures that the attitude of the shield machine in the starting process of the shield meets the standard requirement.
2. The method effectively avoids the problems of poor segment splicing quality, tunnel portal leakage, over-limit ground surface settlement and the like in the beginning of the shield at the curved segment, and ensures the molding quality of the shield tunnel.
3. The method reduces the influence of the small-radius moderate curve section on the starting construction of the shield, greatly improves the construction efficiency, saves the construction cost and shortens the construction period.
Drawings
FIG. 1 is a schematic diagram of shield cutting line method originating construction of an ultra-small radius moderate curve segment.
Fig. 2 is a layout view of freeze holes for freezing and strengthening the end head.
FIG. 3 is a schematic view of a construction sequence for removing a cave door.
In the figure, 1 is an initial 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 a shield tail and the secant path during the initial process, y is the maximum distance between a shield machine and the secant path during the initial process, and theta is the included angle between the secant path and the designed central line of the shield tunnel.
Detailed Description
The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.
Example 1: a shield cutting line starting construction method for an ultra-small radius moderate curve segment is disclosed, and the method comprises the following steps of:
(1) shield cutting line starting line design
The shield launching is in an ultra-small radius moderate curve section, the conventional tangent line launching method cannot meet the requirement, and a tangent line type is adopted for launching. And according to the parameters of the shield machine, the length of the starting bracket and the arrangement angle of the freezing pipes, the central coordinate of the shield starting tunnel is fitted to determine a shield secant starting line. And establishing a mathematical calculation model according to the geometric relation of the starting attitude of the shield secant of the small-radius curve segment, and calculating and determining a pre-deflection angle, a maximum offset and a shield tail pre-deflection angle between the starting secant and the designed tunnel. Referring to an ideal arc path 2 in fig. 1, the starting direction of the shield tunneling machine forms an angle theta with the design center line of the shield tunnel, the deviation between the tail of the shield and the design axis is x, the maximum deviation between the posture of the shield tunneling machine and the design axis is y after the shield tunneling machine is linearly propelled for 12m, and both x and y are required to meet the requirements of standard design.
(2) End freezing reinforcement
The shield starting end adopts a cup-shaped horizontal freezing and reinforcing mode, the thickness of a cup bottom is not less than 3.5m, the thickness of a cup wall is 2.0m, and the longitudinal length is not less than 12.0 m. Before freezing reinforcement is carried out, according to the spatial position of the arrangement of the freezing pipe of the shield cutting line 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, and the bending strength is not less than 1.6MPa, so that the position of a freezing hole in the tunnel portal range is ensured to have no influence on the starting of the shield. Referring to fig. 2, the longitudinal length of the starting end freezing and reinforcing area is 12m from the edge of the wall of the enclosure structure, wherein the thickness of the cup bottom is 3.62m on the left line, 3.68m on the right line, and the thickness of the cup wall is 2.0 m. The cup bottom freezing holes at the starting end are respectively arranged in a circle along the hole centers phi 2.6m and phi 5.2m, the number of the freezing holes is 25, and the circle center is 1; a circle of freezing holes with the wall of the cup is arranged along a position with a diameter of 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 12 m.
(3) Starting station and reaction frame positioning installation
And (3) positioning, lofting and rechecking an originating station and a reaction frame according to the originating line of the shield cutting line designed in the step (1), and ensuring that the installation space positions of the originating station and the reaction frame meet the requirements of the originating line of the shield cutting line. And determining the space position of the starting bracket according to the starting line of the determined shield cutting line, wherein the center of the starting bracket is arranged at an angle theta with the center of the tunnel portal, and the center of the starting bracket is ensured to be coincident with the starting line of the determined shield cutting line. In order to prevent the shield tunneling machine from generating head planting in the starting process, the mounting elevation of the starting bracket is raised by 20mm compared with the set elevation, the distance between the foremost end of the starting bracket and the outer edge of the starting tunnel portal is reduced, and the cutter head can be quickly jacked into the soil body after being separated from the starting bracket.
(4) Negative ring canal piece installation
And determining the number of the negative ring segments according to the structural sizes of the shield tunneling machine and the starting well and installing the negative ring segments.
(5) Hole gate chisel
And chiseling the enclosure structure at the starting portal manually, wherein chiseling is performed from top to bottom and from the middle to two sides, and the chiseling range is the enclosure structure in the reserved portal contour line. Referring to fig. 3, the tunnel portal chiseling is sequentially performed in two stages according to a digital sequence, the chiseling is performed from top to bottom in the first stage after the end well soil body reinforcement inspection is qualified, the chiseling is performed from top to bottom in the second stage after the starting condition is met, in order to prevent water burst and sand burst during starting, the periphery of the tunnel portal needs to be sealed before the shield is started, and the shield is started to tunnel after the sealing device is installed.
(6) Shield initial tunneling
After the tunneling route is determined, various parameters of shield starting are set according to a shield secant starting route, different geological conditions, ground conditions and the like, and the safety of shield starting tunneling is ensured.
(7) Shield tunneling machine deviation rectifying line fitting
And after the cutter head of the shield machine falls out of the end freezing and reinforcing area, the shield tunneling line is corrected, and the corrected line is fitted according to the principle of least square method. The center coordinates of the cutterhead at different moments on the deviation rectifying curve are set as
Then the least square method deviation rectifying curve fitting polynomial is:
for equation (1), the coefficient a of the least squares solution 0 、a 1 、a 2 、a 3 The method can be solved by a normal equation shown in the formula (2):
for formula (2), take
The corresponding normal equation is:
accordingly, a deviation-correcting curve fitting polynomial can be obtained by solving
In the formula, ω 0- ω 3 are related elements in a general matrix representation form of the equation shown in formula 2, and the known quantity of the function to be fitted can be substituted to obtain the curve to be fitted in specific application. And then the shield machine advances along the curve to finish the starting.
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 can be changed without departing from the spirit of the present invention, and a plurality of specific embodiments are formed, which are common variation ranges of the present invention, and will not be described in detail herein.
Claims (7)
1. A starting construction method of a shield cutting line method for an ultra-small radius moderate curve segment is characterized by comprising the following steps:
(1) determining an arc-shaped path between a starting point and an end point of the shield, wherein the arc-shaped path is tangent to a straight path of shield work;
(2) starting from an initial well, advancing along the secant direction of the arc-shaped path, correcting the secant direction after passing through a reinforcing area in front of the initial well to fit the advancing direction of the shield machine to the shield work straight line path, wherein the correction adopts a least square method, and the central coordinate of a cutterhead at the time t is
Wherein, a 0 、a 1 、a 2 、a 3 For the coefficients of the least-squares solution, the solution is obtained by equation (2)
In the formula: a is k To satisfy the coefficients of the least squares solution of the deskew curve function,
is AND {1, t 2 ……t n The corresponding value of the (X) is obtained,
is prepared by reacting with
And f is the known quantity of the required fitting function.
2. The starting construction method of the shield cutting line method for the ultra-small radius moderate curve segment according to claim 1, characterized in that the reinforcement area in front of the starting well 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, 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 1.6 MPa.
3. The starting construction method of the shield cutting line method of the ultra-small radius moderate curve segment according to claim 1, characterized in that the spatial positions of the starting platform and the reaction frame installation are determined according to the starting line of the shield cutting line and the central position of the tunnel portal steel ring, and measurement lofting is carried out, and the spatial position deviation of the starting platform and the reaction frame is measured and rechecked after the starting platform and the reaction frame are installed.
4. The starting construction method of the shield secant method of the ultra-small radius moderate curve segment as claimed in claim 1, wherein the space position of the starting bracket is determined according to the starting line of the shield secant, the center of the starting bracket is ensured to be overlapped with the starting line of the determined shield secant, the installation elevation of the starting bracket is raised higher than the determined elevation, the distance between the foremost end of the starting bracket and the outer edge of the starting tunnel door is reduced, and the cutter head can be quickly jacked into the soil body after being separated from the starting bracket.
5. The starting construction method of the shield secant method of the ultra-small radius moderate curve segment as claimed in claim 1, characterized in that the shield is required to be sealed around the tunnel portal before starting from the starting well, and the shield is started to start tunneling after the sealing device is installed.
6. The starting construction method of the shield secant method of the ultra-small radius moderate curve segment as claimed in claim 1, wherein the tunnel portal is chiseled in two stages after the tail of the shield machine is completely driven into the starting tunnel portal, the first stage is chiseled from top to bottom after the reinforcement inspection of the end well soil body is qualified, and the second stage is chiseled from top to bottom after the starting condition is satisfied.
7. The method of claim 1, wherein the direction of the shield machine is at an angle θ to the design centerline of the shield tunnel, and the offset distance between the tail of the shield machine and the arc path is xThe maximum deviation of the shield machine from the arc path in the starting process is y, wherein theta is arcsin (L/2R), x is Lsin theta,
l is the shield length, and R is the line curve radius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210351196.3A CN114922646A (en) | 2022-04-02 | 2022-04-02 | Shield cutting line starting construction method for ultra-small radius moderate curve segment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210351196.3A CN114922646A (en) | 2022-04-02 | 2022-04-02 | Shield cutting line starting construction method for ultra-small radius moderate curve segment |
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| CN202210351196.3A Pending CN114922646A (en) | 2022-04-02 | 2022-04-02 | Shield cutting line starting construction method for ultra-small radius moderate curve segment |
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| CN113742868A (en) * | 2021-09-27 | 2021-12-03 | 中铁十四局集团隧道工程有限公司 | Method for determining optimal starting direction of small-radius curve tunnel shield |
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2022
- 2022-04-02 CN CN202210351196.3A patent/CN114922646A/en active Pending
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| JPH0681582A (en) * | 1992-09-02 | 1994-03-22 | Nippon Telegr & Teleph Corp <Ntt> | Directional correcting quantity model presuming method for tunnel robot and direction control simulator device |
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Inventor after: Xie Xiaopeng Inventor after: Qiao Rui Inventor after: Sun Xing Inventor after: Xiang Bin Inventor after: Ou Yan Inventor after: Liu Guangpei Inventor after: Si Jianqiang Inventor after: Xu Xingxue Inventor after: Zhou Bingjie Inventor after: Zhang Chao Inventor after: Wang Qingfen Inventor after: Yang He Inventor after: Guo Junhuai Inventor before: Xie Xiaopeng Inventor before: Qiao Rui Inventor before: Sun Xing Inventor before: Xiang Bin Inventor before: Ou Yan Inventor before: Liu Guangpei Inventor before: Si Jianqiang Inventor before: Xu Xingxue Inventor before: Zhou Bingjie Inventor before: Zhang Chao Inventor before: Wang Qingfen Inventor before: Yang He Inventor before: Guo Junhuai |