CN115467712B - Layout method of tunnel clearance convergence point - Google Patents
Layout method of tunnel clearance convergence pointInfo
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- CN115467712B CN115467712B CN202211023615.7A CN202211023615A CN115467712B CN 115467712 B CN115467712 B CN 115467712B CN 202211023615 A CN202211023615 A CN 202211023615A CN 115467712 B CN115467712 B CN 115467712B
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- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 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
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
- G01C9/24—Measuring inclination, e.g. by clinometers, by levels by using liquids in closed containers partially filled with liquid so as to leave a gas bubble
- G01C9/34—Measuring inclination, e.g. by clinometers, by levels by using liquids in closed containers partially filled with liquid so as to leave a gas bubble of the tubular type, i.e. for indicating the level in one direction only
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- General Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
本发明所述的隧道净空收敛点布设方法，专门用于净空收敛点的布设与定位，以期准确地进行相关标定管片位移量测量，从而建立可精准量化数据的测量体系、满足净空收敛测量的高精度要求。所述隧道净空收敛点布设方法是在盾构管片拼装完成后，立即进行净空收敛点监测点布设；使用隧道净空收敛点布设辅助装置的竖直尺标定出隧道轴向前进方向，调整隧道净空收敛点布设辅助装置的水平尺使得该水平尺垂直于隧道轴向前进方向，在水平尺的两侧端与盾构管片交点贴设反光贴，以完成盾构管片两侧的净空收敛点的布设。
The tunnel clearance convergence point layout method described in the present invention is specifically used for the layout and positioning of clearance convergence points, in order to accurately measure the displacement of the relevant calibration segments, thereby establishing a measurement system that can accurately quantify data and meet the high-precision requirements of clearance convergence measurement. The tunnel clearance convergence point layout method is to immediately layout the clearance convergence point monitoring points after the shield segments are assembled; use the vertical ruler of the tunnel clearance convergence point layout auxiliary device to calibrate the axial forward direction of the tunnel; adjust the level of the tunnel clearance convergence point layout auxiliary device so that the level is perpendicular to the axial forward direction of the tunnel; and affix reflective stickers to the intersection of the two ends of the level with the shield segments to complete the layout of the clearance convergence points on both sides of the shield segments.
Description
Technical Field
The invention relates to a layout method for tunnel convergence displacement measurement, and belongs to the field of rock-soil construction and tunnel engineering.
Background
With the rapid development of Chinese economy, urban underground engineering construction is limited by surface structures, and underground tunnel engineering increasingly adopts a shield construction mode. After shield construction, the shield needs to be supported by segment assembly so as to ensure that the section of the tunnel has standard firmness and stability.
The tunnel segment displacement monitoring is an important monitoring item in the construction of a shield method, the change of the clearance size in the tunnel is called convergence displacement, and tunnel clearance convergence measurement is widely adopted as a method for judging the stability of a tunnel supporting structure. At present, tunnel clearance convergence monitoring in the engineering construction process is mainly carried out by adopting a total station. However, during tunnel construction, the tunnel support structure or surrounding rock-soil body may shift, resulting in shifting of headroom convergence points laid on the tunnel support structure or surrounding rock-soil body.
In the prior art, when the tunnel clearance convergence points are distributed, the advancing direction of the tunnel is not calibrated, and whether the connecting lines of the clearance convergence points at two sides are perpendicular to the advancing direction of the tunnel can be judged only by naked eyes. When the measuring points are shifted, larger errors exist between the clearance convergence values measured by the total station, the convergence meter, the laser range finder and other instruments, and the accuracy requirement of urban rail transit on clearance convergence monitoring cannot be met.
In view of this, the present patent application is specifically filed.
Disclosure of Invention
The tunnel clearance convergence point layout method is specially used for layout and positioning of the clearance convergence points to accurately measure the displacement of the relevant calibration segment, so that a measurement system capable of accurately quantifying data is established, and the high-precision requirement of the clearance convergence measurement is met.
The tunnel clearance convergence point laying method comprises the steps of immediately carrying out clearance convergence point monitoring point laying after shield segments are assembled, marking the axial advancing direction of a tunnel by using a vertical ruler of a tunnel clearance convergence point laying auxiliary device, adjusting a horizontal ruler of the tunnel clearance convergence point laying auxiliary device to enable the horizontal ruler to be perpendicular to the axial advancing direction of the tunnel, attaching reflective stickers to intersection points of two side ends of the horizontal ruler and the shield segments to implement arrangement of the clearance convergence points on two sides of the shield segments, wherein the tunnel clearance convergence point laying auxiliary device comprises a group of vertical ruler and horizontal ruler which are connected, the vertical ruler is provided with a vertical fixed ruler, a telescopic vertical extension ruler is connected to an inner cavity of the vertical fixed ruler, a bottom checking pulley is connected to an outer end of the vertical extension ruler, two ends of the horizontal ruler are respectively provided with a connection ruler which is perpendicular to the vertical ruler, one end of each connection ruler is fixedly connected with a pulley, the other end of each connection ruler is connected with a left extension ruler and a right extension ruler through a rotating shaft, a reflection sticker is respectively arranged on two side ends of the horizontal ruler to implement arrangement of the shield segments, the left extension ruler and the right extension ruler are respectively provided with a reflection ruler, the adjustment ruler is used for adjusting an extension angle, the adjustment ruler is used for displaying a measurement result, and a measurement result of a measurement of a vertical offset is arranged on the vertical offset, and a measurement result is measured, and a measurement result is arranged, and a measurement result is comprises the measurement result of a vertical offset.
Further, the tunnel headroom convergence point layout method comprises the following implementation steps:
When the measuring point layout is carried out, erecting a tunnel clearance convergence point layout auxiliary device in a tunnel, opening a vertical ruler, and extending the vertical extension ruler until a bottom checking pulley contacts a shield segment; locking the vertical extension ruler, and recording the vertical height of the vertical ruler; locking the bottom checking pulley, opening the horizontal rule extension rule locking button, extending the left extension rule and the right extension rule of the horizontal rule to two sides until the pulleys at two ends of the horizontal rule are contacted with the shield segment, adjusting the lengths of the left extension rule and the right extension rule to enable the lengths of the two extension rules to be the same, and locking the horizontal rule extension rule locking button; the method comprises the steps of unlocking a bottom checking pulley of a vertical ruler, observing whether the bottom checking pulley slides along a shield segment, if the bottom checking pulley does not move, calibrating the forward direction of a tunnel shaft when the position of the vertical ruler is the center position of the section of the tunnel, if the bottom checking pulley moves, opening a horizontal ruler elongation ruler locking button to unlock a left elongation ruler and a right elongation ruler when the vertical ruler is not at the center position of the section of the tunnel, enabling the left elongation ruler and the right elongation ruler to relatively stretch and move in the process that the bottom checking pulley slides to the bottom position of the shield segment freely, locking the bottom checking pulley and closing the horizontal ruler elongation ruler locking button when the bottom checking pulley slides to the bottom position of the shield segment freely and is stationary, calibrating the forward direction of the tunnel shaft when the position of the vertical ruler is the center position of the section of the tunnel, adjusting the horizontal ruler after calibrating the forward direction of the tunnel shaft, enabling the pulleys on two sides, the connecting rulers on the left elongation ruler and the right elongation ruler to be positioned on the same straight line, and the horizontal ruler is perpendicular to the forward direction of the tunnel shaft, observing whether an angle display is 0, if the reading shows 0, the adjustment is completed, the pulleys at the two ends of the level bar, the connecting bars at the two sides, the left extension bar and the right extension bar are positioned on the same straight line, if the reading does not show 0, the spiral is adjusted until the reading of the offset angle display is 0, the left extension bar and the right extension bar are locked by using a horizontal extension bar locking button, the positions of the pulleys at the two ends are recorded, at the moment, the position of the left pulley is the position of a left clearance convergence point, the position of the right pulley is the position of a right clearance convergence point, reflective patches are respectively attached at the positions, and finally, the arrangement of a group of tunnel two-side clearance convergence points is completed.
Further, the process of adjusting the left and right extension rule comprises the following steps:
A left fine tuning screw and a left fine tuning level bubble for fine tuning the angle of the left extension ruler are arranged at one end of the left extension ruler, and a coarse tuning screw and a coarse tuning level bubble for coarse tuning the angle of the extension ruler are arranged at the other end of the left extension ruler;
A right fine tuning screw and a right fine tuning level bubble for fine tuning the angle of the right extension ruler are arranged at one end of the right extension ruler, and a fine tuning screw and a fine tuning level bubble for fine tuning the angle of the extension ruler are arranged at the other end of the right extension ruler;
Adjusting the coarse adjustment screw, rotating the left extension ruler until the coarse adjustment level bubble is centered, and simultaneously observing whether the reading of the offset angle display is within +/-1 DEG, if the reading is smaller than +/-1 DEG, adjusting the fine adjustment screw, and if the reading is larger than +/-1 DEG, continuing adjusting the coarse adjustment screw until the reading is smaller than +/-1 DEG;
Adjusting the fine tuning screw, rotating the right extension ruler until the fine tuning level bubble is centered, and simultaneously observing whether the reading of the offset angle display is within +/-0.1 degrees, if the reading is smaller than +/-0.1 degrees, adjusting the left and right fine tuning screws, and if the reading is larger than +/-0.1 degrees, continuously adjusting the fine tuning screw to be within +/-0.1 degrees;
adjusting the left fine adjustment screw, and rotating the left extension ruler until the left fine adjustment level bubble is centered;
And adjusting the right fine adjustment screw, and rotating the right extension ruler until the right fine adjustment level bubble is centered.
Further, immediately acquiring clearance convergence initial values after the clearance convergence points on the left side and the right side are distributed, respectively recording readings of a left extension rule and a right extension rule of the level ruler, taking the sum of the readings of the left extension rule and the right extension rule as the size of the clearance direction of the tunnel to be measured, measuring and calculating three times, taking the average value of the three measurement values as the finally determined clearance convergence initial value if the errors of the three measurement values are within 1mm, removing the measurement value again if the errors of the measurement values of a certain time exceed 1mm, and taking the average value of the three measurement values as the finally determined clearance convergence initial value until the errors of the three measurement values are within 1 mm.
Further, the initial value of the clearance convergence is recorded, the clearance convergence is monitored every 24 hours during the construction period of the tunnel engineering, and the result obtained by measurement is subtracted by the initial value of the clearance convergence, namely the accumulated deformation of the clearance convergence of the shield segment.
As described above, the tunnel clearance convergence point layout method has the advantages that the layout mode of the novel auxiliary measuring tool is provided for the phenomenon that the clearance convergence point is offset after the pipe piece is shifted, so that the error influence of the clearance convergence value measured by the total station and the actual value can be overcome, the pipe piece clearance convergence measurement result is more accurate, the on-site measuring device is easy to layout and less affected by environment, and the high-precision requirement of clearance convergence measurement is effectively met.
Drawings
The application will now be further described with reference to the following drawings;
FIG. 1 is a schematic diagram of a tunnel headroom convergence point layout method according to the present application;
FIG. 2 is a schematic plan view of tunnel headroom convergence point layout;
FIG. 3 is a schematic view of a vertical ruler for laying auxiliary devices;
FIG. 4 is a schematic view of a level bar with an auxiliary device;
FIG. 5 is a schematic view of the structure of the offset measuring scale;
FIG. 6 is a schematic diagram of a tunnel headroom convergence point measurement procedure;
In the drawings, 1, a shield segment, 2, a vertical ruler, 21, a vertical fixed ruler, 22, a vertical extension ruler, 23, a bottom checking pulley, 3, a horizontal ruler, 31, a pulley, 32, an extension hole of an offset measuring ruler, 33, an offset measuring ruler, 331, an offset measuring vertical ruler, 332, an offset measuring horizontal ruler, 34, a connecting ruler, 35, an extension ruler locking buckle, 36, a rotating shaft, 37, a left fine adjustment screw, 38, a left fine adjustment bubble, 39, a left extension ruler, 310, a rough adjustment bubble, 311, a rough adjustment screw, 312, a laser range finder, 313, an offset angle display, 314, a horizontal ruler extension ruler locking button, 315, a fine adjustment screw, 316, a fine adjustment bubble, 317, a right extension ruler, 318, a right fine adjustment bubble, 319, a right fine adjustment screw, 4, a left clearance convergence point and a 5, right clearance convergence point.
Detailed Description
In order to further illustrate the technical means adopted by the present application for achieving the preset design purpose, the following preferred embodiments are presented in conjunction with the accompanying drawings.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than those herein described, and those skilled in the art may readily devise numerous other arrangements that do not depart from the spirit of the invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 1 to 6, according to the tunnel clearance convergence point layout method, clearance convergence point monitoring points are laid immediately after shield segment assembly is completed;
Calibrating the forward direction of the tunnel shaft by using a vertical ruler 2 of a tunnel clearance convergence point arrangement auxiliary device, adjusting a horizontal ruler 3 of the tunnel clearance convergence point arrangement auxiliary device to enable the horizontal ruler to be perpendicular to the forward direction of the tunnel shaft, and attaching reflective patches at intersection points of two side ends of the horizontal ruler 3 and shield segments to finish arrangement of clearance convergence points on two sides of the shield segments;
The tunnel clearance convergence point layout auxiliary device comprises a group of vertical bars 2 and horizontal bars 3 which are connected. The vertical ruler 2 is provided with a vertical fixed ruler 21 (the length of the vertical ruler can be 1 m), a vertical extension ruler 22 capable of moving in a telescopic way is connected to the inner cavity of the vertical fixed ruler 21, the outer end of the vertical extension ruler 22 is connected with a bottom checking pulley 23 used for checking whether the vertical ruler 2 is positioned at the center of a shield segment, and the bottom checking pulley 23 can be locked;
The two ends of the horizontal ruler 3 are respectively provided with a connecting ruler 34 which is vertical to the vertical ruler 2, one end of each connecting ruler 34 is fixedly connected with a pulley 31, and the other end of each connecting ruler 34 is connected with a left extension ruler 39 and a right extension ruler 317 through a rotating shaft 36;
the left extension ruler 39 and the right extension ruler 317 are respectively provided with various adjusting screws for adjusting the angles of the extension ruler and level bubbles for checking and displaying the adjustment results, and the laser range finder 312 is provided with an offset angle display 313;
the pulley 31 cannot rotate around the connecting ruler 34, the pulley 31 is connected with a foldable and telescopic offset measuring ruler 33 through an offset measuring ruler extending hole 32 arranged in the center of the pulley 31, and the offset measuring ruler 33 comprises an offset measuring vertical ruler 331 and an offset measuring horizontal ruler 332 which are connected vertically.
The tunnel headroom convergence point layout method comprises the following implementation steps:
When the measuring point layout is carried out, a tunnel clearance convergence point layout auxiliary device is erected in a tunnel, the vertical ruler 2 is opened, and the vertical extension ruler 22 is extended until the bottom checking pulley 23 contacts the shield segment 1;
Locking the vertically elongated rule 22;
Locking the bottom checking pulley 23, opening the horizontal rule extension rule locking button 314, extending the left extension rule 39 and the right extension rule 317 of the horizontal rule 3 to two sides until the pulleys 31 at two ends of the horizontal rule contact the shield segment 1, adjusting the lengths of the left extension rule 39 and the right extension rule 317 to ensure that the lengths of the two extension rules are the same, and locking the horizontal rule extension rule locking button 314;
The locking of the bottom checking pulley 23 of the vertical ruler 2 is released, the bottom of the tunnel is basically not influenced by water and soil pressure, the bottom of the shield segment is not deformed, and the bottom of the shield segment is the central position of the tunnel;
If the bottom checking pulley 23 has a moving trend, the vertical ruler 2 is not positioned at the center of the section of the tunnel, and the shield segment 1 is deformed. The horizontal ruler elongation ruler locking button 314 is opened to unlock the left elongation ruler and the right elongation ruler, the left elongation ruler 39 and the right elongation ruler 317 are correspondingly and telescopically moved in the process that the bottom checking pulley 23 freely slides to the bottom position of the shield segment, when the bottom checking pulley 23 freely slides to the bottom position of the shield segment and is static, the bottom checking pulley 23 is locked, the horizontal ruler elongation ruler locking button 314 is closed, the position of the vertical ruler 2 is the center position of the section of the tunnel, the axial forward direction of the tunnel can be calibrated, the vertical height of the vertical ruler 2 is recorded, meanwhile, the sum of the readings of the left elongation ruler and the right elongation ruler and the difference value of the inner diameters of the original segment are the change quantity of the current shield segment along the tunnel clearance direction, and the change quantity is calculated in the clearance convergence accumulated change quantity.
After the forward direction of the tunnel shaft is calibrated, the level 3 is adjusted so that the pulleys 31 on two sides of the level 3, the connecting ruler 34 on two sides, the left extension ruler 39 and the right extension ruler 317 are positioned on the same straight line, and the level 3 is perpendicular to the forward direction of the tunnel shaft;
Observing whether the reading of the offset angle display 313 is 0, if the reading is 0, finishing adjustment, wherein the pulleys 31 at the two ends of the level 3, the connecting rulers 34 at the two sides, the left extension ruler 39 and the right extension ruler 317 are positioned on the same straight line, if the reading is not 0, continuing to adjust the left fine tuning screw 37 and the right fine tuning screw 319 until the reading of the offset angle display 313 is 0, and locking the left extension ruler and the right extension ruler by using the horizontal ruler extension ruler locking button 314;
recording the positions of the pulleys 31 at the two ends, wherein the position of the pulley 31 at the left end is the position of the clearance convergence point 4 at the left side, the position of the pulley 31 at the right end is the position of the clearance convergence point 5 at the right side, and the reflective stickers are respectively stuck at the positions, so that the arrangement of the clearance convergence points at the two sides of a group of tunnels is finally completed.
Based on the distance between left and right clearance convergence points on two sides, which is defined by the tunnel clearance convergence point layout method, calculating to obtain the distance between the vertical ruler 2 and the clearance convergence point on one side of the last section by using a trigonometric function, and lofting by using a laser range finder to obtain the position of the vertical ruler 2 of the auxiliary device for laying the clearance convergence points.
In order to improve the accuracy of adjusting the left extension ruler and the right extension ruler to be positioned on the same straight line in the measuring point arrangement process, the further improvement scheme of the auxiliary device for arranging the tunnel clearance convergence point is as follows:
A level extension bar locking button 314 for fixing the overall length of the extension bar is provided at the overlapping portion between the left extension bar 39 and the right extension bar 317;
An extension rule locking buckle 35 for fixing the rotation angle of the left extension rule and the right extension rule is arranged at the joint of the connection rule 34, the left extension rule 39 and the right extension rule 317;
One end of the left extension ruler 39 is provided with a left fine adjustment screw 37 and a left fine adjustment level bubble 38 for fine adjustment of the angle of the left extension ruler, and the other end of the left extension ruler is provided with a coarse adjustment screw 311 and a coarse adjustment level bubble 310 for coarse adjustment of the angle of the extension ruler, wherein the precision of the coarse adjustment screw 311 is +/-1 DEG, the precision of the left fine adjustment screw 37 is higher, and the left connection ruler 34 and the left extension ruler 39 can be ensured to be positioned on the same straight line;
One end of the right extension rule 317 is provided with a right fine adjustment screw 319 and a right fine adjustment level bubble 318 for fine adjustment of the angle of the right extension rule, and the other end of the right extension rule 317 is provided with a fine adjustment screw 315 and a fine adjustment level bubble 316 for fine adjustment of the angle of the extension rule, wherein the precision of the fine adjustment screw 315 is +/-0.1 degrees, the precision of the right fine adjustment screw 319 is higher, and the right connection rule 34 and the right extension rule 317 can be ensured to be positioned on the same straight line.
The specific process for adjusting the left and right extension ruler comprises the following steps:
Adjusting the coarse adjustment screw 311, rotating the left extension ruler 39 until the coarse adjustment level bubble 310 is centered, and simultaneously observing whether the reading of the offset angle display 313 is within +/-1 degrees, if the reading is smaller than +/-1 degrees, adjusting the fine adjustment screw 315, and if the reading is larger than +/-1 degrees, continuing to adjust the coarse adjustment screw 311 until the reading is smaller than +/-1 degrees;
Adjusting the fine tuning screw 315, rotating the right extension rule 317 until the fine tuning level bubble 316 is centered, and simultaneously observing whether the reading of the offset angle display 313 is within +/-0.1 degrees, if the reading is less than +/-0.1 degrees, adjusting the left and right fine tuning screws 319, and if the reading is greater than +/-0.1 degrees, continuing to adjust the fine tuning screw 315 to within +/-0.1 degrees;
the left fine adjustment screw 37 is adjusted, the left fine adjustment screw 37 has higher precision, the left connecting ruler 34 and the left extending ruler 39 can be guaranteed to be positioned on the same straight line, and the left extending ruler 39 is rotated until the left fine adjustment level bubble 38 is centered;
adjusting the right trimming screw 319, the right trimming screw 319 has higher accuracy, and can ensure that the right connecting rule 34 and the right extending rule 317 are on the same straight line, and the right extending rule 317 is rotated until the right trimming level bubble 318 is centered.
As shown in fig. 6, by applying the tunnel headroom convergence point layout method of the present application, headroom convergence initial value collection is immediately performed after the layout of headroom convergence points on the left and right sides is completed;
the readings of a left extension ruler 39 and a right extension ruler 317 of the horizontal ruler 3 are respectively recorded, the sum of the readings of the left extension ruler and the right extension ruler is taken as the dimension of the current measurement tunnel clearance direction, and the measurement and calculation are carried out three times;
If errors of the three measurement values are all within 1mm, taking an average value of the three measurement values as a finally determined headroom convergence initial value;
If the error of a certain measured value exceeds 1mm, removing the measured value, and re-taking the value until the error of the measured value of three times is within 1mm, and taking the average value of the measured values of three times as a finally determined headroom convergence initial value.
And if the shield segment has been deformed, taking the value obtained by subtracting the shield segment variation from the current measured value as the shield segment clearance convergence initial value.
Completing and recording a headroom convergence initial value, and performing headroom convergence monitoring according to a monitoring frequency specified by a relevant monitoring specification during tunnel engineering construction, wherein a preferable time interval is to perform monitoring once every 24 hours;
the specific monitoring method is the same as the acquisition process of the initial value of the shield segment clearance convergence.
And subtracting the headroom convergence initial value from the measured result to obtain the accumulated shield segment headroom convergence deformation.
Similar technical solutions can be derived from the solution content presented in connection with the figures and description, as described above. But all the solutions without departing from the structure of the present application still fall within the scope of the claims of the technical solution of the present application.
Claims (4)
1. A tunnel clearance convergence point layout method is characterized in that clearance convergence point monitoring points are immediately laid after shield segment assembly is completed;
The vertical ruler of the tunnel clearance convergence point laying auxiliary device is used for marking the forward direction of the tunnel shaft, the horizontal ruler of the tunnel clearance convergence point laying auxiliary device is adjusted to enable the horizontal ruler to be perpendicular to the forward direction of the tunnel shaft, and reflection patches are attached to intersection points of two side ends of the horizontal ruler and shield segments so as to implement the arrangement of the clearance convergence points on two sides of the shield segments;
The tunnel clearance convergence point laying auxiliary device comprises a group of connected vertical rulers and horizontal rulers, wherein each vertical ruler is provided with a vertical fixed ruler, a telescopic vertical extension ruler is connected to the inner cavity of each vertical fixed ruler, the outer end of each vertical extension ruler is connected with a bottom checking pulley, two ends of each horizontal ruler are respectively provided with a connecting ruler which is vertical to the vertical ruler, one end of each connecting ruler is fixedly connected with a pulley, the other end of each connecting ruler is connected with a left extension ruler and a right extension ruler through a rotating shaft, the left extension ruler and the right extension ruler are respectively provided with an adjusting screw for adjusting the angle of the extension ruler and level bubbles for checking and displaying adjustment results, each laser range finder is provided with an offset angle display, each pulley is connected with an offset measurement ruler through an offset measurement ruler stretching hole, and each offset measurement ruler comprises an offset measurement vertical ruler and an offset measurement horizontal ruler which are connected vertically;
Comprising the following implementation steps of the method,
When the measuring point layout is carried out, erecting a tunnel clearance convergence point layout auxiliary device in a tunnel, opening a vertical ruler, and extending the vertical extension ruler until a bottom checking pulley contacts a shield segment;
Locking the vertical extension ruler;
locking the bottom checking pulley, opening the horizontal rule extension rule locking button, extending the left extension rule and the right extension rule of the horizontal rule to two sides until the pulleys at two ends of the horizontal rule are contacted with the shield segment, adjusting the lengths of the left extension rule and the right extension rule to enable the lengths of the two extension rules to be the same, and locking the horizontal rule extension rule locking button;
the method comprises the steps of unlocking a bottom checking pulley of a vertical ruler, observing whether the bottom checking pulley slides along a shield segment, if the bottom checking pulley does not have a moving trend, marking the forward direction of a tunnel shaft when the position of the vertical ruler is the center position of the section of the tunnel, recording the vertical height of the vertical ruler, if the bottom checking pulley has a moving trend, the vertical ruler is not at the center position of the section of the tunnel, opening a horizontal ruler elongation ruler locking button to unlock a left elongation ruler and a right elongation ruler, and relatively stretching the left elongation ruler and the right elongation ruler in the process of freely sliding the bottom checking pulley to the bottom position of the shield segment;
After the forward direction of the tunnel shaft is calibrated, adjusting the level bar so that pulleys on two sides of the level bar, connecting bars on two sides of the level bar, a left extension bar and a right extension bar are positioned on the same straight line, and the level bar is perpendicular to the forward direction of the tunnel shaft;
If the reading is not 0, the screw is adjusted until the reading of the offset angle display is 0, and the left extension rule and the right extension rule are locked by using a horizontal rule extension rule locking button;
Recording the positions of pulleys at two ends, wherein the position of a left pulley is the position of a left clearance convergence point, and the position of a right pulley is the position of a right clearance convergence point;
and (5) respectively attaching reflective patches at the positions to finally finish the layout of the clearance convergence points at two sides of the tunnel.
2. The tunnel headroom convergence point layout method according to claim 1, wherein the process of adjusting the left and right extension scales comprises the steps of,
A left fine tuning screw and a left fine tuning level bubble for fine tuning the angle of the left extension ruler are arranged at one end of the left extension ruler, and a coarse tuning screw and a coarse tuning level bubble for coarse tuning the angle of the extension ruler are arranged at the other end of the left extension ruler;
A right fine tuning screw and a right fine tuning level bubble for fine tuning the angle of the right extension ruler are arranged at one end of the right extension ruler, and a fine tuning screw and a fine tuning level bubble for fine tuning the angle of the extension ruler are arranged at the other end of the right extension ruler;
Adjusting the coarse adjustment screw, rotating the left extension ruler until the coarse adjustment level bubble is centered, and simultaneously observing whether the reading of the offset angle display is within +/-1 DEG, if the reading is smaller than +/-1 DEG, adjusting the fine adjustment screw, and if the reading is larger than +/-1 DEG, continuing adjusting the coarse adjustment screw until the reading is smaller than +/-1 DEG;
Adjusting the fine tuning screw, rotating the right extension ruler until the fine tuning level bubble is centered, and simultaneously observing whether the reading of the offset angle display is within +/-0.1 degrees, if the reading is smaller than +/-0.1 degrees, adjusting the left and right fine tuning screws, and if the reading is larger than +/-0.1 degrees, continuously adjusting the fine tuning screw to be within +/-0.1 degrees;
adjusting the left fine adjustment screw, and rotating the left extension ruler until the left fine adjustment level bubble is centered;
And adjusting the right fine adjustment screw, and rotating the right extension ruler until the right fine adjustment level bubble is centered.
3. The tunnel headroom convergence point layout method according to any one of claims 1 or 2, wherein the headroom convergence initial value is collected immediately after the layout of the headroom convergence points on the left and right sides is completed;
respectively recording readings of a left elongation ruler and a right elongation ruler of the horizontal ruler, taking the sum of the readings of the left elongation ruler and the right elongation ruler as the dimension of the current measurement tunnel clearance direction, and measuring and calculating for three times;
If errors of the three measurement values are all within 1mm, taking an average value of the three measurement values as a finally determined headroom convergence initial value;
If the error of a certain measured value exceeds 1mm, removing the measured value, and re-taking the value until the error of the measured value of three times is within 1mm, and taking the average value of the measured values of three times as a finally determined headroom convergence initial value.
4. The method for arranging the tunnel headroom convergence point of claim 3, wherein the initial value of headroom convergence is recorded, and headroom convergence monitoring is performed every 24 hours during tunnel engineering construction;
And subtracting the headroom convergence initial value from the measured result to obtain the accumulated shield segment headroom convergence deformation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211023615.7A CN115467712B (en) | 2022-08-25 | 2022-08-25 | Layout method of tunnel clearance convergence point |
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