CN110119564B - Segment preselection method based on automatic measurement of shield tail clearance - Google Patents
Segment preselection method based on automatic measurement of shield tail clearance Download PDFInfo
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Abstract
The invention discloses a duct piece preselection method based on automatic measurement of shield tail clearance, which comprises the following steps: firstly, obtaining the shield tail clearance l of each segment of the current ring0And the stroke difference delta of the propulsion oil cylinder of each segment; then screening out the minimum shield tail clearance and the maximum stroke difference; and then comparing the minimum shield tail space with a clearance threshold, comparing the maximum stroke difference with the stroke difference threshold, and respectively solving the optimal point position and the recommended point position of the k blocks according to four conditions of comparison of the two thresholds.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a duct piece preselection method based on automatic measurement of shield tail clearance.
Background
The installation of the duct piece in shield construction is carried out in the host under the protection of the shield tail shell, each duct piece is pushed out after the installation is finished, and the selection of a proper duct piece type and the correct installation of the duct piece are the guarantee of the tunnel quality.
The duct piece is a primary lining after the tunnel boring machine excavates, is used for supporting soil pressure and water pressure on the tunnel, simultaneously prevents the tunnel soil from collapsing, deforming and leaking water, is a permanent structure of the tunnel, and provides counter force for the tunnel boring machine to dig.
The correct type selection of the duct piece has important significance for the excavation of the tunnel boring machine, and the wrong type selection of the duct piece can cause the following problems: 1. segment dislocation, damage, cracks and other defects; 2. causing water leakage in the tunnel; 3. the shield tail clearance is too small, so that shield tunneling and segment installation are difficult; 4. the tail brush of the shield tail is easy to damage, so that the shield tail leaks slurry.
Correct segment selection is beneficial to correct tunneling, and poor segment selection often causes difficulty in tunnel deviation correction, snakelike tunneling and other problems.
Disclosure of Invention
In view of the above-described deficiencies in the prior art, the present invention provides a segment preselection method based on automatic measurement of shield tail clearance.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a duct piece preselection method based on automatic measurement of shield tail clearance comprises the following steps:
s1, obtaining the shield tail clearance l of each segment of the current ring0And the stroke difference delta of the propulsion oil cylinder of each segment.
And S2, screening out the minimum shield tail clearance and the maximum stroke difference.
And S3, comparing the minimum shield tail gap with the gap threshold, if the minimum shield tail gap is smaller than the gap threshold, performing the step S4, otherwise, performing the step S14.
S4, comparing the maximum stroke difference with the threshold value, if the maximum stroke difference is less than the threshold value, proceeding to steps S5-S12, otherwise proceeding to step S13.
S5, calculating the deviation p of each pipe piece relative to the design axis0。
The method specifically comprises the following steps: s5.1, according to the shield tail clearance l of each duct piece0Calculating the deviation p between each segment and the axis of the tail shield1；
S5.2, acquiring deviation p of the tail shield and the design axis2；
The coordinate of the front point of the shield machine can be known as (x) according to the display of the shield measuring system1,y1) The coordinate of the rear point is (x)2,y2) The horizontal deviation of the shield machine relative to the design axis is (x)1-x2) And 4, the vertical deviation of the tail shield of the shield machine relative to the design axis is (y)1-y2)/4。
S5.3, calculating the deviation p of each segment relative to the design axis according to the step S5.1 and the step S5.20；
S6, calculating the trend alpha of each segment relative to the shield tail according to the stroke difference delta of the propulsion oil cylinder of each segment in the current ring2；
α2i＝Δi/d；
d is the distance between the propulsion oil cylinders; alpha is alpha2iThe mounting point of the ith duct piece corresponds to the trend of the duct piece relative to the shield tail; deltaiIs the ith tubeAnd the stroke difference of the propulsion oil cylinder corresponding to the mounting point position of the sheet.
S7, calculating the turning amount alpha of the DTA of the next ring relative to the axis of the DTA of the current ring3；
α3＝p0-p2-α2。
S8, calculating the trend beta of each segment relative to the shield tail of the next ring corresponding to the installation position of each segment;
βi＝α2i+β1i；
β1i＝β0i/D；
βithe trend of the ith segment of the next ring relative to the shield tail; beta is a0iThe correction amount of the ith segment mounting point position is obtained; d is the diameter of the segment; beta is a1iAnd correcting the trend of the mounting point position of the ith duct piece.
S9, calculating the deviation correction value beta of the installation point position of each segment in the next ring2；
β2i＝βi×w；
β2iThe correction value is the correction value of the ith segment installation point position of the next ring; beta is aiThe mounting point of the ith duct piece of the next ring corresponds to the trend of the duct piece relative to the shield tail; w is the ring width.
S10, calculating the shield tail clearance l of each segment of the next ring;
li＝l0i+β2i；
lia shield tail gap of the ith segment of the next ring; l0iThe shield tail clearance of the ith segment of the current ring.
S11, calculating the deviation p of each segment of the next ring relative to the design axis;
pi＝p0i+β2i；
pithe deviation of the ith tube piece of the next ring relative to the design axis; p is a radical of0iIs the deviation of the ith tube sheet of the current ring relative to the design axis.
S12, screening the optimal point positions of the k blocks;
selecting the alpha satisfying beta-alpha2The mounting point position of the duct piece with the | less than or equal to 0 is the optimal point position of the k block,and the other point locations are the recommended point locations of the k blocks.
The conditions which are simultaneously met by describing the optimal point positions by characters are as follows:
the horizontal deviation of the current pipe piece is positive, and the horizontal trend of the assembled pipe piece is not increased compared with the horizontal trend of the current ring pipe piece;
the horizontal deviation of the current duct piece is negative, and the horizontal trend is not reduced after the duct piece is assembled;
the vertical deviation of the current duct piece is positive, and the vertical trend is not increased after the duct piece is assembled;
the vertical deviation of the current duct piece is negative, and the vertical trend is not reduced after the duct piece is assembled;
and S13, taking the segment point position corresponding to the shortest stroke position of the propulsion oil cylinder as the optimal point position of the k block, and taking the other point positions on the half side where the shortest stroke of the propulsion oil cylinder is located as recommended point positions.
And S14, comparing the maximum stroke difference with a stroke difference threshold, if the maximum stroke difference is smaller than the stroke difference threshold, performing step S15, otherwise, performing step S16.
And S15, setting the segment point at the maximum shield tail clearance corresponding to the minimum shield tail clearance as an optimal point (ensuring that the thickest segment is assembled at the minimum clearance and the clearance is increased), and setting the rest points at the half side of the maximum shield tail clearance as recommended points.
S16, calculating the optimal point location and the recommended point location of the K block according to the minimum clearance overrun condition and the maximum travel difference overrun condition respectively; if the optimal point positions of the K blocks in the two conditions coincide or the optimal point positions are mutually recommended to the opposite side, the point position in the middle of the coincident optimal point position or the two optimal point positions is taken as a final optimal point position, and the rest of the point positions which simultaneously satisfy the recommended point positions in the two conditions are taken as final recommended point positions.
The deviations, trends and amounts of deviation correction referred to in this invention are both horizontal and vertical components.
The invention comprehensively selects the shield tail clearance, the stroke of the propulsion oil cylinder and the position of the tunnel boring machine, so that the tunnel boring machine can carry out boring according to the designed axis, the optimal construction state is achieved as far as possible on the premise of ensuring the quality of the duct piece, and the accompanying phenomena of duct piece damage, water leakage and the like caused by the dislocation of the tunnel boring machine are avoided.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Taking a shield machine (6.28 meters of a cutter head) as an example, the trend is calculated. According to the conventional operation, the horizontal direction is positive to the right, and the left is negative; the vertical direction is positive, and the lower direction is negative.
The front point of the shield machine measuring system is positioned at the notch changing position, the rear point is positioned in the middle shield, the distance between the front point and the rear point is 3.92 meters, and 4 meters are taken for calculation convenience; the position of the thrust oil cylinder of the shield tunneling machine is positioned on a circle with the centrosymmetric radius of 2.85 meters, and the distance between adjacent thrust oil cylinders is about 4 meters.
A duct piece preselection method based on automatic measurement of shield tail clearance comprises the following steps:
s1, obtaining the shield tail clearance l of each segment of the current ring0And the stroke difference delta of the propulsion oil cylinder of each segment.
And S2, screening out the minimum shield tail clearance and the maximum stroke difference.
And S3, comparing the minimum shield tail gap with the gap threshold, if the minimum shield tail gap is smaller than the gap threshold, performing the step S4, otherwise, performing the step S14.
S4, comparing the maximum stroke difference with the threshold value, if the maximum stroke difference is less than the threshold value, proceeding to steps S5-S12, otherwise proceeding to step S13.
S5, calculating the deviation p of each pipe piece relative to the design axis0。
The method specifically comprises the following steps: s5.1, according to the shield tail clearance l of each duct piece0Calculating the deviation p between each segment and the axis of the tail shield1；
S5.2, acquiring deviation p of the tail shield and the design axis2；
The shield machine can be known according to the display of the shield measuring systemThe coordinate of the front point is (x)1,y1) The coordinate of the rear point is (x)2,y2) The horizontal deviation of the shield machine relative to the design axis is (x)1-x2) And 4, the vertical deviation of the tail shield of the shield machine relative to the design axis is (y)1-y2)/4。
S5.3, calculating the deviation p of each segment relative to the design axis according to the step S5.1 and the step S5.20；
S6, calculating the trend alpha of each segment relative to the shield tail according to the stroke difference delta of the propulsion oil cylinder of each segment in the current ring2；
α2i＝Δi/d；
d is the distance between the propulsion oil cylinders; alpha is alpha2iThe mounting point of the ith duct piece corresponds to the trend of the duct piece relative to the shield tail; deltaiThe stroke difference of the propulsion oil cylinder corresponding to the mounting point position of the ith duct piece.
S7, calculating the turning amount alpha of the DTA of the next ring relative to the axis of the DTA of the current ring3；
α3＝p0-p2-α2。
S8, calculating the trend beta of each segment relative to the shield tail of the next ring corresponding to the installation position of each segment;
βi＝α2i+β1i；
β1i＝β0i/D；
βithe trend of the ith segment of the next ring relative to the shield tail; beta is a0iThe correction amount of the ith segment mounting point position is obtained; d is the diameter of the segment; beta is a1iAnd correcting the trend of the mounting point position of the ith duct piece.
S9, calculating the deviation correction value beta of the installation point position of each segment in the next ring2；
β2i＝βi×w；
β2iThe correction value is the correction value of the ith segment installation point position of the next ring; beta is aiThe mounting point of the ith duct piece of the next ring corresponds to the trend of the duct piece relative to the shield tail; w is the ring width.
S10, calculating the shield tail clearance l of each segment of the next ring;
li＝l0i+β2i；
lia shield tail gap of the ith segment of the next ring; l0iThe shield tail clearance of the ith segment of the current ring.
S11, calculating the deviation p of each segment of the next ring relative to the design axis;
pi＝p0i+β2i；
pithe deviation of the ith tube piece of the next ring relative to the design axis; p is a radical of0iIs the deviation of the ith tube sheet of the current ring relative to the design axis.
S12, screening the optimal point positions of the k blocks;
selecting the alpha satisfying beta-alpha2And the mounting point positions of the duct pieces with the | less than or equal to 0 are the optimal point positions of the k blocks, and the rest point positions are the recommended point positions of the k blocks.
The conditions which are simultaneously met by describing the optimal point positions by characters are as follows:
the horizontal deviation of the current pipe piece is positive, and the horizontal trend of the assembled pipe piece is not increased compared with the horizontal trend of the current ring pipe piece;
the horizontal deviation of the current duct piece is negative, and the horizontal trend is not reduced after the duct piece is assembled;
the vertical deviation of the current duct piece is positive, and the vertical trend is not increased after the duct piece is assembled;
the vertical deviation of the current duct piece is negative, and the vertical trend is not reduced after the duct piece is assembled;
and S13, correcting is not considered, the segment point position corresponding to the shortest stroke position of the propulsion oil cylinder is directly used as the optimal point position of the k block, and the rest point positions of the half side where the shortest stroke of the propulsion oil cylinder is located are recommended point positions.
And S14, comparing the maximum stroke difference with a stroke difference threshold, if the maximum stroke difference is smaller than the stroke difference threshold, performing step S15, otherwise, performing step S16.
And S15, deviation rectification is not considered, the segment point at the maximum shield tail clearance corresponding to the minimum shield tail clearance is set as the optimal point (the thickest segment is assembled at the minimum clearance, the clearance is increased), and the other point positions on the half side of the maximum shield tail clearance are the recommended point positions.
S16, calculating the optimal point location and the recommended point location of the K block according to the minimum clearance overrun condition and the maximum travel difference overrun condition respectively; if the optimal point positions of the K blocks in the two conditions coincide or the optimal point positions are mutually recommended to the opposite side, the point position in the middle of the coincident optimal point position or the two optimal point positions is taken as a final optimal point position, and the rest of the point positions which simultaneously satisfy the recommended point positions in the two conditions are taken as final recommended point positions.
The deviation, the trend and the deviation correcting amount mentioned in the invention all comprise a horizontal component and a vertical component, formulas appearing in the text are general formulas for calculating the horizontal component and the vertical component, and the calculation is carried out respectively.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (4)
1. A duct piece preselection method based on automatic measurement of shield tail clearance is characterized by comprising the following steps:
s1, obtaining the shield tail clearance l of each segment of the current ring0And the stroke difference delta of the propulsion oil cylinder of each segment;
s2, screening out the minimum shield tail clearance and the maximum stroke difference;
s3, comparing the minimum shield tail clearance with a clearance threshold, and if the minimum shield tail clearance is smaller than the clearance threshold, performing the step S4;
s4, comparing the maximum stroke difference with a stroke difference threshold, and if the maximum stroke difference is smaller than the stroke difference threshold, performing steps S5-S12;
s5, acquiring deviation p of each pipe piece relative to the design axis0；
S6, calculating the trend alpha of each segment relative to the shield tail according to the stroke difference delta of the propulsion oil cylinder of each segment of the current ring2；
α2i＝Δi/d；
d is the distance between the propulsion oil cylinders; alpha is alpha2iIs the ithThe mounting point position of the duct piece corresponds to the trend of the duct piece relative to the shield tail; deltaiThe stroke difference of the propulsion oil cylinder corresponding to the mounting point position of the ith segment;
s7, calculating the turning amount alpha of the DTA of the next ring relative to the axis of the DTA of the current ring3；
α3＝p0-p2-α2；
S8, calculating the trend beta of each segment relative to the shield tail of the next ring corresponding to the installation position of each segment;
βi＝α2i+β1i；
β1i＝β0i/D；
βithe trend of the ith segment of the next ring relative to the shield tail; beta is a0iThe correction amount of the ith segment mounting point position is obtained; d is the diameter of the segment; beta is a1iCorrecting the trend of the mounting point position of the ith duct piece;
s9, calculating the deviation correction value beta of the installation point position of each segment in the next ring2；
β2i＝βi×w；
β2iThe correction value is the correction value of the ith segment installation point position of the next ring; beta is aiThe trend of the ith segment of the next ring relative to the shield tail; w is the ring width;
s10, calculating the shield tail clearance l of each segment of the next ring;
li＝l0i+β2i；
lia shield tail gap of the ith segment of the next ring; l0iA shield tail gap of the ith segment of the current ring;
s11, calculating the deviation p of each segment of the next ring relative to the design axis;
pi＝p0i+β2i；
pithe deviation of the ith tube piece of the next ring relative to the design axis; p is a radical of0iThe deviation of the ith segment of the current ring relative to the design axis;
s12, screening the optimal point positions of the k blocks;
selecting the alpha satisfying beta-alpha2Duct piece mounting point with | < 0The bit is the optimal point position of the k block, and the other point positions are the recommended point positions of the k block; if the maximum stroke difference is greater than or equal to the stroke difference threshold, performing step S13;
s13, taking the segment point position corresponding to the shortest stroke position of the propulsion oil cylinder as the optimal point position of the k block, and taking the rest point positions of the half side where the shortest stroke of the propulsion oil cylinder is located as recommended point positions; if the minimum shield tail clearance is larger than or equal to the clearance threshold value, performing step S14;
s14, comparing the maximum stroke difference with a stroke difference threshold value, and if the maximum stroke difference is smaller than the stroke difference threshold value, performing the step S15;
s15, setting the segment point at the maximum shield tail clearance corresponding to the minimum shield tail clearance as an optimal point, ensuring that the thickest segment is assembled at the minimum clearance, increasing the clearance, and setting the rest points at the half side of the maximum shield tail clearance as recommended points; if the maximum stroke difference is greater than or equal to the stroke difference threshold, performing step S16;
s16, calculating the optimal point location and the recommended point location of the K block according to the minimum clearance overrun condition and the maximum travel difference overrun condition respectively; if the optimal point positions of the K blocks in the two conditions coincide or the optimal point positions are mutually recommended to the opposite side, the point position in the middle of the coincident optimal point position or the two optimal point positions is taken as a final optimal point position, and the rest of the point positions which simultaneously satisfy the recommended point positions in the two conditions are taken as final recommended point positions.
2. The segment preselection method based on automatic measurement of shield tail clearance according to claim 1, characterized in that in step S5, the specific steps are as follows:
s5.1, according to the shield tail clearance l of each duct piece0Calculating the deviation p between each segment and the axis of the tail shield1；
S5.2, acquiring deviation p of the tail shield and the design axis2；
The coordinate of the front point of the shield machine can be known as (x) according to the display of the shield measuring system1,y1) The coordinate of the rear point is (x)2,y2) The horizontal deviation of the shield machine relative to the design axis is (x)1-x2) And 4, the vertical deviation of the tail shield of the shield machine relative to the design axis is (y)1-y2)/4；
S5.3, calculating the deviation p of each segment relative to the design axis according to the step S5.1 and the step S5.20。
3. The segment preselection method based on automatic measurement of shield tail clearance of claim 1, characterized in that the deviation comprises a horizontal deviation and a vertical deviation, and the trend comprises a horizontal trend and a vertical trend; the deviation correction values include a horizontal deviation correction value and a vertical deviation correction value.
4. The segment preselection method based on automatic measurement of shield tail clearance according to claim 3, characterized in that: in step S12, the conditions that the optimum points satisfy simultaneously are:
the horizontal deviation of the current pipe piece is positive, and the horizontal trend of the assembled pipe piece is not increased compared with the horizontal trend of the current ring pipe piece;
the horizontal deviation of the current duct piece is negative, and the horizontal trend is not reduced after the duct piece is assembled;
the vertical deviation of the current duct piece is positive, and the vertical trend is not increased after the duct piece is assembled;
the vertical deviation of the current duct piece is negative, and the vertical trend after assembly is not reduced.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106934159A (en) * | 2017-03-14 | 2017-07-07 | 中交公局厦门工程有限公司 | A kind of assembled point bit digitizing type selecting assembling method of duct pieces of shield tunnel |
| CN107725067A (en) * | 2016-02-19 | 2018-02-23 | 中铁局集团有限公司 | The general ring pipe sheet assembling point position of shield determines method |
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| US10513928B2 (en) * | 2017-08-31 | 2019-12-24 | Flowserve Management Company | Axial thrust balancing device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107725067A (en) * | 2016-02-19 | 2018-02-23 | 中铁局集团有限公司 | The general ring pipe sheet assembling point position of shield determines method |
| CN106934159A (en) * | 2017-03-14 | 2017-07-07 | 中交公局厦门工程有限公司 | A kind of assembled point bit digitizing type selecting assembling method of duct pieces of shield tunnel |
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