CN114109411A - Pipe sheet assembling point position selection device in shield construction, selection method and application - Google Patents
Pipe sheet assembling point position selection device in shield construction, selection method and application Download PDFInfo
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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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- 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
- 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
- E21D11/40—Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
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Abstract
The invention belongs to the technical field of tunnel construction, and discloses a device and a method for selecting splicing point positions of pipe slices in shield construction and application of the device and the method. The analysis is carried out on the segment type, the assembling mode, the axis fitting, the shield tail clearance and the jack stroke difference, the appropriate assembling point position of the segment is selected to enable the horizontal included angle alpha 2 between the segment and the design axis and the vertical included angle theta 2 between the segment and the design axis to tend to be zero, the included angle between the segment axis and the shield tail axis is reduced, the friction probability between the segment and the shield tail is reduced, and the shield tail is prevented from leaking and gushing water and sand. The invention can visually display the assembling point position of the segment capping block, and segment assembling operators can quickly and accurately determine the assembling point position, thereby increasing the point selection precision and avoiding the occurrence of large axis deviation of the formed segment due to small gap between the segment outer arc surface and the shield tail inner arc surface caused by inaccurate selection of the assembling point position. The invention avoids the wrong platform and damage caused by the wrong dislocation of the segment assembling point to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a device and a method for selecting a pipe sheet splicing point position in shield construction and application of the device and the method.
Background
At present, the duct piece is a main assembly component for shield construction, is the innermost barrier of the tunnel and plays a role in resisting soil layer pressure, underground water pressure and some special loads. The segment is a permanent lining structure of the shield tunnel, and the quality of the shield segment is directly related to the overall quality and safety of the tunnel, so that the waterproof performance and the durability of the tunnel are influenced.
In the shield tunnel construction, the selection of segment splicing point positions is crucial, and if the point position selection is improper, the most direct expression is segment dislocation, segment damage and water leakage can be caused under severe conditions, so that the quality of a formed tunnel is reduced, and the safety of shield construction is also reduced.
The point location selection is assembled to traditional section of jurisdiction all is that the shield constructs the driver according to experience, combines factors such as tunnel level and vertical line parameter and the current gesture of shield section of jurisdiction to select the point location, but specifically assembles at which point location, need calculate, the analysis reachs through to the wedge volume, can't be fast, accurate make the selection, causes section of jurisdiction wrong platform damaged phenomenon easily from this. Therefore, a quick and accurate method is needed to help a shield driver to intuitively select splicing point positions through wedge amount data.
Through the above analysis, the problems and defects of the prior art are as follows: in the construction of the prior art, the selection of the assembling work point of the duct piece can not provide guidance for the field and can not avoid the occurrence of the phenomena of duct piece dislocation and damage. In addition, in the prior art, the accuracy rate is low in the position determination of the selected point position. The cost is high.
Disclosure of Invention
In order to overcome the problems in the related art, the disclosed embodiment of the invention provides a device, a method and an application for selecting the position of a pipe sheet splicing point in shield construction.
The technical scheme is as follows: a method for selecting pipe slice assembling point positions in shield construction comprises the following steps:
the analysis is carried out on the segment type, the assembling mode, the axis fitting, the shield tail clearance and the jack stroke difference, the appropriate assembling point position of the segment is selected to enable the horizontal included angle alpha 2 between the segment and the design axis and the vertical included angle theta 2 between the segment and the design axis to tend to be zero, the included angle between the segment axis and the shield tail axis is reduced, the friction probability between the segment and the shield tail is reduced, and the shield tail is prevented from leaking and gushing water and sand.
In one embodiment, when the difference value of the upper and lower or left and right strokes of the hinged oil cylinder of the jack is large, an angle is generated between the shield middle body and the shield, the difference value of the upper and lower or left and right strokes of the hinged oil cylinder is subtracted from the difference value of the upper and lower or left and right strokes, and the final result is used as the basis for segment type selection.
In an embodiment, the method for selecting the segment splicing point positions in the shield construction specifically includes:
selecting a duct piece model;
step two, selecting an assembling position;
thirdly, calculating the segment splicing point positions: according to the design axis trend of the proposed tunnel, the trend of the duct piece is in line trend according to the selection of the duct piece model and the assembling position, and the assembled duct piece meets the minimum requirement of the shield tail clearance.
In an embodiment, the first segment type selection specifically includes:
the standard ring is added with a turning ring, the standard ring is used for a straight line section, and the turning ring is used for a curved line section; the turning rings comprise left and right turning wedge-shaped rings, and different curves are fitted with various combinations of the standard rings;
the universal ring has wedge-shaped pieces, and is assembled at different point positions through K blocks, so that the requirements of fitting different curves and construction deviation correction are met.
In one embodiment, the step two of assembling position selection includes:
the assembly form comprises: assembling through seams and assembling staggered seams, wherein the assembling point positions of the K blocks of adjacent rings of the formed tunnel are positioned at the same position in the assembling process of the through seams; the staggered joint assembly is that the assembly point positions of adjacent ring K blocks of the formed tunnel are staggered;
when general ring section of jurisdiction is assembled, assemble ring and last ring section of jurisdiction C piece bottled position clockwise or anticlockwise rotation, utilize 2, 5 or 8 bolt holes to satisfy the fissure of displacement and assemble the requirement.
In an embodiment, the third step specifically includes:
(1) segment typesetting:
calculating the arrangement mode of a turning ring and a standard ring of a curve section of an interval line according to the relation between the central angle of the curve and the deflection angle generated by the turning ring;
the calculation formula of the deflection angle of the turning ring is as follows:
θ＝2γ＝2arctgδ/D
in the formula: theta-deflection angle of deflection ring
Delta-half of the maximum wedge-shaped amount of the turn ring
D-segment diameter
Through calculation: θ is 0.382;
according to the calculation formula of the central angle:
a＝180L/πR；
in the formula:
l-length of the centerline of a section of line;
r-radius of curve, 400 m;
substituting theta into a to obtain the value L;
(2) measuring the gap between the shield tail: the gap between the shield tail of the shield tunneling machine is 30-50mm, and the upper position, the lower position, the left position and the right position of the duct piece are measured before the duct piece is installed each time;
(3) calculating the posture and the oil cylinder stroke of the shield tunneling machine: the shield machine sets three virtual reference points: front, middle, back points; the front point is at the cutting opening of the shield machine, the middle point is at the splicing machine, and the rear point is at the tail shield of the shield machine; the shield automatic measuring system calculates the horizontal and vertical deviation of the front point and the rear point of the shield through measurement; calculating the direction of the axis of the shield tunneling machine as the attitude of the shield tunneling machine according to the deviation;
front point O1 coordinates X1, Y1, Z1 wherein X1 is horizontal deviation, Y1 is vertical deviation, Z1 is mileage;
midpoint O2 coordinates X2, Y2, Z2 wherein X2 is horizontal deviation, Y2 is vertical deviation, Z2 is mileage;
back point O3 coordinates X3, Y3, Z3 where X3 is the horizontal deviation, Y3 is the vertical deviation, Z3 is mileage;
horizontal trend and vertical trend are angle values, and numerical values are expressed in radians;
the level tends to be alpha 1 ═ X1-X3)/L;
the vertical trend theta 1 is (Y1-Y3)/L;
the axial line of the shield machine is set as a Z axis, the axial line of the duct piece is set as a Z1 axis, the axial direction of the duct piece is also decomposed into a horizontal direction X and a vertical direction Y, and the lengths of the oil cylinders represented by the four stroke sensors are respectively L upper, L lower, L left and L right;
the horizontal included angle alpha is (L right-L left)/L;
the vertical included angle theta is (L upper-L lower)/L upper and lower;
the left and right of L and the upper and lower of L are both 6.25 m;
calculating the included angle between the duct piece and the design axis after acquiring the included angle between the shield tunneling machine and the design axis and the included angle between the duct piece and the shield tunneling machine;
a horizontal included angle alpha 2 between the duct piece and the design axis is alpha 1+ alpha;
and the included angle theta 2 between the pipe piece and the design axis is theta 1+ theta.
In one embodiment, the step (1) further comprises: the typesetting of the shield ring on the vertical curve,
when there is vertical curve or the segment with horizontal and vertical curve cross section is typeset, the accumulated error caused by the vertical curve, and the asbestos rubber plate is used as caulking material adjustment and correction.
In an embodiment, the segment splicing point location selection method in shield construction further includes:
acquiring three-dimensional image data of a segment posture in construction through a camera terminal; dividing the K blocks, the adjacent blocks and the standard blocks to obtain simulation model values of the divided K blocks, adjacent blocks and standard blocks; comparing and analyzing the advance quantity obtained by the change value of the wedge quantity of the duct piece noted between the inner ring and the outer ring, and then combining the actual needs of the project to obtain the duct piece matched with the splicing point position in the actual project;
the method specifically comprises the following steps:
marking K blocks, adjacent blocks and standard block names on an inner ring of a top plate, marking a wedge amount change value of a duct piece between the inner ring and an outer ring, when the duct piece selects an assembling point position, selectively assembling the top plate to move the K blocks to corresponding point positions of a bottom plate, performing addition and subtraction operation on the upper wedge amount change value, the lower wedge amount change value, the left wedge amount change value and the right wedge amount change value, and determining a preliminary estimation value of an advance amount;
acquiring three-dimensional image data of the posture of the duct piece in construction by using a camera terminal; dividing K blocks, adjacent blocks and standard blocks in the pipe sheet assembling point position selection device in the shield construction method to obtain simulation model values of the divided K blocks, adjacent blocks and standard blocks;
and step three, carrying out comparative analysis according to the preliminary estimation value for determining the advance quantity obtained in the step one and the simulation model value obtained in the step two, and then combining with the actual needs of the engineering to obtain the duct piece matched with the splicing point position in the actual engineering.
In an embodiment, in the second step, the method for dividing the K blocks, the adjacent blocks, and the standard blocks by the camera terminal includes:
the initial installation arrangement number, the butt joint distribution function and the initial distribution function in the step 2 are as follows:
the initial installation array number ρ ═ spf (i);
butt distribution function
Initial distribution function
In step 3, the particle migration collision evolution process includes:
wherein x is the position of the cellular particle; v. ofiI is more than or equal to 0 and less than or equal to 8; τ is the relaxation time; f. ofi(x, t) is the cell particle density moving along direction i;
fi eq(x, t) is a butt distribution function defined as: f. ofi eq(x，t)＝wiρ(x，t)；
spf is a signed pressure function, and the equation is:
the value range of the spf function is [ -1,1 [)]；c1And c2The average values of the brightness of the image inside and outside the contour are respectively expressed and are obtained by the following formula:
wherein i is 1, 2; w is a1Representing a contour inner region; w is a2Representing the outline outer region;
the step 5 further comprises the following steps: identifying data flow and control flow dependence of the safety advance by using an automatic symbolic program slice, wherein a function set comprises definition statements of the safety advance, the function set is continuously expanded in the process of slice analysis, and in order to obtain a minimized program subset, a slice rule is defined as follows:
tracing the data flow of the program as it executes from n to m, rule (1) indicating that propagation of the secret reference should be traced; rule (2) indicates that propagation of other parameters of the function needs to be tracked when the secret references are used as parameters of the function call; rule (3) indicates that propagation of a return value of a function needs to be tracked when a secret reference is used as a parameter of a function call; rule (4) indicates that when any reference to a secret is dereferenced, the secret and its reference need to be tracked;
determining the propagation of information in a system dependency graph SDG by using a Frama-c-static software analysis framework, sequentially and independently carrying out propagation analysis on the lead quantity in { s }, recording the obtained lead quantity set as { sfi }, { sfi } continuously changes during iteration, stopping analysis when { sfi } and a reference set of { sfi } are not changed any more, and obtaining a large number of potential lead quantity sensitive function data values;
the step 6 further comprises the following steps:
representing the set of all the advance quantities p to which the advance quantity a is covered,
a set of all codes representing the propagation of the advance A;
definition 1: a similarity function sim (x, y) is a function that maps variables x, y into numbers in [0,1], measuring the similarity between x and y, sim (x, y) ═ 1 corresponds to objects x, y being the same, while sim (x, y) ═ 0 corresponds to very different objects;
using the Jaccard similarity coefficient used in the information retrieval as a similarity measure:
using a relevance threshold rho e [0, sim(s)1，s2)max]As a criterion for whether to partition variables into the same group, the relevance threshold represents how much performance a user of the software is willing to sacrifice in exchange for the security of the system; sim(s)1，s2) When the value is more than or equal to rho, the value of s is adjusted1，s2Divided into the same security zone group, sim(s)1，s2) If < rho, then s will be1，s2Dividing the slices into different safety zone groups, wherein overlapping parts exist among the slices meeting different variables in the dividing process; at ρ ═ sim(s)1，s2)maxThe automatic partitioning scheme stores each secret in a separate security zone; when ρ is 0, the final architecture degrades to that in the simulation model.
The invention also aims to provide a pipe sheet assembling point position selecting device in the shield construction for realizing the pipe sheet assembling point position selecting method in the shield construction, wherein the pipe sheet assembling point position selecting device in the shield construction is provided with a bottom plate and a top plate, a bearing is fixed in the center of the bottom plate, the upper end of the bearing penetrates through the top plate, and the top plate rotates along the bearing;
the bottom plate is uniformly divided into a plurality of parts by point location lines and is consistent with the position of a jack of the shield tunneling machine; the top plate comprises an inner ring and an outer ring, and the inner ring and the outer ring are drawn in equal proportion according to the proposed tunnel by using the duct pieces;
the inner ring is marked with K blocks, adjacent blocks and standard block names, and the wedge-shaped quantity change value of the pipe piece is marked between the inner ring and the outer ring.
In an embodiment, the device for selecting a pipe segment assembling point location in shield construction further includes:
the camera terminal is used for acquiring three-dimensional image data of the tube sheet posture in construction; dividing the K blocks, the adjacent blocks and the standard blocks to obtain simulation model values of the divided K blocks, adjacent blocks and standard blocks; and comparing and analyzing the advance obtained by the change value of the wedge-shaped quantity of the segment noted between the inner ring and the outer ring, and combining the actual needs of the engineering to obtain the segment matched with the splicing point position in the actual engineering.
The invention also aims to provide application of the method for selecting the splicing point positions of the pipe slices in the shield construction in tunnel construction.
By combining all the technical schemes, the invention has the advantages and positive effects that:
the invention can visually display the assembling point position of the segment capping block, and segment assembling operators can quickly and accurately determine the assembling point position, thereby increasing the point selection precision and avoiding the occurrence of large axis deviation of the formed segment due to small gap between the segment outer arc surface and the shield tail inner arc surface caused by inaccurate selection of the assembling point position.
Compared with the prior art, the invention has the advantages that:
according to the requirements of duct piece posture adjustment and shield tail clearance adjustment in construction, K assembling point positions can be accurately selected through a duct piece assembling point selection model, and a guiding effect is provided for a shield driver and duct piece assembling work point position selection; the invention has simple integral structure and very low manufacturing cost; and the calculation speed is high, the precision is high, and the phenomena of dislocation and damage caused by segment splicing point dislocation are avoided to the greatest extent.
The method analyzes 5 aspects of segment types, assembly modes, axis fitting, shield tail clearance and jack stroke difference, the actual conditions in the construction process are changeable, segment type selection is carried out according to specific conditions, and a proper assembly point position (or turning ring) is selected, so that the friction probability of the segment and the shield tail is reduced, the shield tail leakage and water and sand gushing risks are reduced, the repair and leakage stoppage expenses are reduced, the construction cost is reduced, and the quality of the formed tunnel is improved.
The invention provides a method for selecting a segment splicing point position in shield construction, wherein the inner ring of a top plate is marked with K blocks, adjacent blocks and standard block names, a segment wedge amount change value is marked between the inner ring and the outer ring, when the segment is selected to be spliced, the top plate is selected to move the K blocks to corresponding point positions of a bottom plate, the upper wedge amount change value, the lower wedge amount change value, the left wedge amount change value and the right wedge amount change value are subjected to addition and subtraction operation, and a preliminary estimation value of an advance amount is determined; acquiring three-dimensional image data of a segment posture in construction by using a camera terminal; dividing K blocks, adjacent blocks and standard blocks in the pipe sheet assembling point position selection device in the shield construction method to obtain simulation model values of the divided K blocks, adjacent blocks and standard blocks; and carrying out comparative analysis according to the obtained preliminary estimation value for determining the advance and the obtained simulation model numerical value, and combining with the actual needs of the engineering to obtain the duct piece matched with the splicing point position in the actual engineering. Provides guidance for actual engineering.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram of a pipe sheet splicing point location selection device in shield method construction provided by an embodiment of the present invention.
In the figure: A. a base plate; B. a top plate; C. a bearing; E. an inner ring; F. and (4) an outer ring.
Fig. 2 is a diagram illustrating an arrangement of a turning ring and a standard ring for calculating a curve segment of an interval line according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the difference 24.75mm between the outer contours of two sides of a circular curve tunnel forming tunnel with the radius of 400m of the axis according to the embodiment of the invention every 1.5 m.
Fig. 4(a) shows that the maximum wedge amount of the tube sheet is 39.6mm when the splicing position of the tube sheet C block provided by the embodiment of the invention is 14 # top position.
Fig. 4(b) shows that the assembly position of the segment C provided by the embodiment of the present invention is 11 top position, and the maximum wedge amount of the segment is 9.9 mm.
Fig. 5 is a schematic view of a shield machine axis provided by an embodiment of the present invention.
Fig. 6(a) is a schematic view in which the shield tunneling machine axis is set to the Z axis, the segment axis is set to the Z1 axis, and the segment axis is also broken down into the horizontal direction X and the vertical direction Y.
The lengths of the cylinders represented by the four stroke sensors in fig. 6(b) are respectively an upper L schematic view, a lower L schematic view, a left L schematic view and a right L schematic view.
Fig. 7 is a flowchart of a method for selecting a pipe segment splicing point position in shield method construction according to an embodiment of the present invention.
Fig. 8 is a flowchart of a method for dividing the image capturing terminal into K blocks, adjacent blocks, and standard blocks according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in figure 1, the invention provides a pipe sheet assembling point position selecting device in shield construction, which is provided with a bottom plate A and a top plate B which are arranged at an upper layer and a lower layer, wherein a bearing C is fixed at the center of the bottom plate B, the upper end of the bearing penetrates through the top plate B, and the top plate rotates along the bearing.
The diameter of the bottom plate A is 15cm, and the disc is uniformly divided into 16 parts by point location lines, which are consistent with the point location of a jack of a shield tunneling machine. The diameter of the top plate B is 13cm, the top plate B comprises an inner ring E and an outer ring F, and the inner ring and the outer ring are drawn according to the proposed tunnel by using duct pieces in equal proportion.
The inner ring E is marked with K blocks, abutting blocks and standard block names, the wedge amount change value of the duct piece is marked between the inner ring E and the outer ring F, when the duct piece is selected to be assembled into the point position, the top plate B is selected to move the K blocks to the corresponding point position of the bottom plate A, the upper wedge amount change value, the lower wedge amount change value, the left wedge amount change value and the right wedge amount change value are subjected to addition and subtraction operation, and the advance amount is determined.
In a preferred embodiment of the invention, when the pipe piece assembling point position selecting device in shield construction is applied, the top plate of the device can be directly rotated according to the requirements of adjusting the posture of the pipe piece and adjusting the gap of the tail of the shield in construction when the pipe piece assembling point position is selected, so that the assembling point position can be rapidly and accurately determined.
The technical scheme of the invention is further described by combining the analysis of the segment selection factor in shield construction.
The duct piece is used as a primary lining after shield tunneling in shield construction, supports soil pressure and water pressure acting on the periphery of a tunnel, prevents tunnel deformation, soil body collapse and water leakage, is a permanent structure of the tunnel and provides reverse thrust for shield construction.
The gap between the shield tails is small when the duct pieces are improperly selected in the tunnel construction process by a shield method, the outer arc surfaces of the duct pieces are in hard friction with the shield tails, the outer arc surfaces of the duct pieces are damaged, meanwhile, the shield tails are worn and easily cause the seal failure of the shield tails, so that underground water and sandy soil are gushed into the shield machine, and safety accidents are caused.
The common quality problems of the formed tunnel mainly comprise: the damaged and tunnel percolating water of section of jurisdiction leads to section of jurisdiction seam crossing seepage leading cause for the section of jurisdiction junction extrados damaged, leads to the waterproof inefficacy of section of jurisdiction. Therefore, the selection and assembly of the duct pieces are very important.
1. Segment type
At present, in urban subway tunnels in China, precast concrete pipe sheets are used as permanent linings. The duct pieces are usually manufactured in advance by professional manufacturers and are generally divided into two types according to functions:
1.1 Standard Ring + Turn Ring
Standard loops are used for straight line segments and turn loops are used for curved line segments.
In order to meet the requirements of curve simulation and construction deviation correction, a left turning wedge-shaped ring and a right turning wedge-shaped ring are designed, and different curves are fitted through various combinations of the left turning wedge-shaped ring and the right turning wedge-shaped ring and a standard ring.
1.2 Universal Ring
The universal ring, namely each ring pipe piece is provided with a wedge-shaped amount, and is assembled at different point positions through K blocks, so that the requirements of curve fitting with design and construction deviation correction are met.
2. Assembled form
The assembling form of the duct piece is mainly divided into another form of through joint assembling and staggered joint assembling, wherein the through joint assembling means that assembling points of K blocks of adjacent rings of the formed tunnel are located at the same position; the staggered joint assembly means that the assembly point positions of adjacent ring K blocks of the formed tunnel are staggered, when the general ring duct pieces are assembled, in the duct piece assembling process, the assembly ring and the bottle-containing position of the previous ring duct piece C block rotate clockwise (anticlockwise), and the staggered joint assembly requirements can be met by the positions of 2 bolt holes, 5 bolt holes and 8 bolt holes (jacks). The staggered joint assembly mode is mainly adopted in subway construction in China, and the through joint assembly mode is adopted in Shanghai subway construction.
3. Segment selection
According to the design axis trend of the proposed tunnel, the segment combination according with the tunnel line is achieved by selecting the segment model and the assembling position.
The model selection principle is as follows: the trend of the duct piece is ensured to meet the trend of the line, and the assembled duct piece meets the minimum requirement of the shield tail clearance.
The model selection basis comprises:
3.1 line parameters
Before a shield project is started, a general arrangement of segments is required according to a designed route, and the step is generally called segment typesetting.
1) Standard Ring + Turn Ring form
By the segment typesetting, the number of required turning rings (including left turning and right turning) and the number of standard rings of the segment of the circuit are basically known; and the standard ring and the turning ring are arranged on the curve section.
According to the relation between the central angle of the curve and the deflection angle generated by the turning ring, the arrangement mode of the turning ring and the standard ring of the curve section of the interval line can be calculated. As shown in fig. 2. The corresponding duct piece typesetting parameters are shown in table 1.
TABLE 1
The calculation formula of the deflection angle of the turning ring is as follows:
θ＝2γ＝2arctgδ/D
in the formula: theta-deflection angle of deflection ring
Delta-half of the maximum wedge-shaped amount of the turn ring
D-segment diameter
Through calculation: theta is 0.382
According to the calculation formula of the central angle:
a＝180L/πR
in the formula:
l-length of the centerline of a section of line;
radius of R-curve, 400m
Substituting theta into a, L is 2.666m
The above formula shows that on a 400m circular curve, one turn ring is used every 2.666m, the length of the tube piece is 1.2m, that is, on a 400m circular curve, the assembly relationship of the standard ring and the turn ring is 1 ring standard ring +1 turn ring.
Typesetting of shield ring on vertical curve
Considering that when the vertical curve is fitted by a circular curve, the radius of the circular curve is generally larger, so that when the duct piece is typeset in the vertical curve or the cross section of the flat curve and the vertical curve, the influence of the vertical curve is not considered, only the influence of the flat curve is considered, and as for the accumulated error caused by the vertical curve, a asbestos rubber plate and the like are used as caulking materials for adjustment and correction.
2) General ring form
Taking the shield interval of the Tianjin coastal new area B1 line as an example, the ring width of the segment is 1.5m, the wedge amount of the segment is 39.6mm, and the curve segment is assembled by adjusting the segment C block and controlling the wedge amount of the segment, so that the tunnel design line is fitted. The difference of the outline of each 1.5m of the two sides of the circular curve tunnel forming tunnel with the 400m axis radius is as follows: 24.75 mm. As shown in fig. 3.
When the splicing position of the segment C block shown in fig. 4(a) is 14 # top position, the maximum wedge-shaped amount of the segment is 39.6 mm; as shown in fig. 4(b), the splicing position of the segment C block is 11 top positions, the wedge-shaped amount of the segment is 9.9mm at most, and the linear fitting of a circular curve with the plane radius of 400m can be met. (39.6+ (24.75-14.85) ═ 49.5 ═ 24.75 × 2).
3.2 Shield Tail gap
If the gap between the shield tails is too small, the shield tails of the shield tunneling machine will rub and collide with the duct pieces in the tunneling process. The resistance of the shield tunneling machine to forward tunneling is increased slightly, the tunneling speed is reduced, and the shield tail crushes the segments to cause water leakage of the tunnel.
The gap between the shield tail of the shield tunneling machine is generally 30-50mm, and the upper position, the lower position, the left position and the right position of the duct piece are measured before the duct piece is installed each time. If the shield tail clearance in one direction is found to be close to 20mm, the turning ring is used for adjusting the shield tail clearance.
If the gap of the shield tail at the left side is too small, the wedge-shaped quantity is selected to be modulated at the right side during assembling, and the gap of the shield tail is adjusted. Therefore, when the shield machine is used for tunneling straight segments, a proper time must be selected, a ring wedge amount is assembled to modulate the left ring and adjust the left ring, otherwise, the left shield tail gap is smaller and smaller until the shield tail collides with the duct piece. If the shield machine is in a curve segment, comprehensive consideration is carried out according to the characteristics of the line.
3.3 attitude and cylinder travel of shield machine
In the process of small curve radius axis propulsion, the adjustment of the stroke difference of the left jack and the right jack is a main method for completing left and right deviation correction, and in the specific deviation correction process, an operator can judge whether the shield is to complete the predicted deviation correction according to the length difference of the left jack and the right jack (according to the report form of the previous ring, the left and right length difference of the jacks and the design axis change of the current propulsion ring).
When a shield cut just enters a curve section from a straight line section (a transition curve section enters a circular arc curve section), as the segments at the tail of the shield are not spliced, namely the segments are not adjusted by the advance amount, the shield is just positioned at the tangential position of the design axis of the curve section by increasing the length difference of a left jack and a right jack, and when the same curve section is pushed, the advance amount adjustment of the segments just plays a role in adjusting the pushing direction of the shield, if the posture of the shield is good, the shield can keep a good posture by keeping the original jack difference.
The shield machine is set with three virtual reference points: anterior, midpoint, posterior. The front point is at the cutting opening of the shield machine, the middle point is at the splicing machine, and the rear point is at the tail shield of the shield machine. The shield automatic measuring system can calculate the horizontal and vertical deviation of the front point and the rear point of the shield through the measuring. And calculating the direction of the axis of the shield tunneling machine through the deviation. Namely the shield machine posture.
Front point O1 coordinates X1, Y1, Z1 wherein X1 is horizontal deviation, Y1 is vertical deviation, Z1 is mileage;
midpoint O2 coordinates X2, Y2, Z2 wherein X2 is horizontal deviation, Y2 is vertical deviation, Z2 is mileage;
rear point O3 coordinates X3, Y3, Z3 where X3 is the horizontal deviation, Y3 is the vertical deviation, Z3 is the mileage
The coordinates are obtained by automatic measurement of a shield machine measuring system.
Horizontal and vertical trends are angular values, and values are expressed in radians.
The level tends to alpha 1 ═ X1-X3)/L
And when the curve segment is opened and hinged, the distance from the middle point to the rear point of the L is about 3.045 m. As shown in the shield axis of fig. 5.
As shown in fig. 6(a), the shield axis is Z-axis, the segment axis is Z1, the segment axis is also divided into horizontal direction X and vertical direction Y, and the cylinder lengths indicated by the four stroke sensors are L upper, L lower, L left, and L right, respectively, as shown in fig. 6 (b).
Horizontal included angle alpha (L right-L left)/L left or right
Vertical included angle theta (L upper-L lower)/L upper and lower
The left and right of L and the upper and lower of L are both 6.25 m.
Knowing the included angle between the shield machine and the design axis and the included angle between the duct piece and the shield machine, the included angle between the duct piece and the design axis can be calculated.
A horizontal included angle alpha 2 between the duct piece and the design axis is alpha 1+ alpha;
the included angle theta 2 between the duct piece and the design axis is theta 1+ theta;
the type selection of the duct piece is to enable a horizontal included angle alpha 2 between the duct piece and a design axis and a vertical included angle theta 2 between the duct piece and the design axis to be close to zero by selecting the type and the point position of the duct piece. The included angle between the axis of the duct piece and the axis of the shield tail is reduced as much as possible, and the damage to a seal system of the shield tail is avoided.
When the difference value of the upper and lower or left and right strokes of the hinged oil cylinder is large, an angle is generated between the middle body of the shield and the shield, and the accuracy of the stroke difference of the oil cylinder is influenced. The difference of the upper and lower or left and right stroke of the articulated cylinder is subtracted from the difference of the upper and lower or left and right stroke, and the final result is considered as the basis of the selection of the segment.
The method analyzes 5 aspects of segment types, assembly modes, axis fitting, shield tail clearance and jack stroke difference, the actual conditions in the construction process are changeable, segment type selection is carried out according to specific conditions, and a proper assembly point position (or turning ring) is selected, so that the friction probability of the segment and the shield tail is reduced, the shield tail leakage and water and sand gushing risks are reduced, the repair and leakage stoppage expenses are reduced, the construction cost is reduced, and the quality of the formed tunnel is improved.
The technical solution of the present invention is further described below with reference to an application example.
The method for selecting the assembling point positions of the pipe sheets in the shield construction comprises the following steps:
acquiring three-dimensional image data of a segment posture in construction through a camera terminal; dividing the K blocks, the adjacent blocks and the standard blocks to obtain simulation model values of the divided K blocks, adjacent blocks and standard blocks; comparing and analyzing the advance quantity obtained by the change value of the wedge quantity of the duct piece noted between the inner ring and the outer ring, and then combining the actual needs of the project to obtain the duct piece matched with the splicing point position in the actual project;
as shown in fig. 7, the method for selecting the splicing point position of the pipe sheet in the shield construction specifically comprises the following steps:
s101, marking K blocks, adjacent blocks and standard block names on an inner ring of a top plate, marking a wedge amount change value of a duct piece between the inner ring and an outer ring, when the duct piece selects an assembling point position, selectively assembling the top plate to move the K blocks to corresponding point positions of a bottom plate, performing addition and subtraction operation on the upper wedge amount change value, the lower wedge amount change value, the left wedge amount change value and the right wedge amount change value, and determining a preliminary estimation value of the advance amount;
s102, acquiring three-dimensional image data of a segment posture in construction by using a camera terminal; dividing K blocks, adjacent blocks and standard blocks in the pipe sheet assembling point position selection device in the shield construction method to obtain simulation model values of the divided K blocks, adjacent blocks and standard blocks;
and S103, comparing and analyzing the preliminary estimation value of the determined advance quantity obtained in the step S101 and the simulation model value obtained in the step S102, and obtaining the duct piece matched with the splicing point position in the actual engineering according to the actual requirement of the engineering.
As shown in fig. 8, in a preferred embodiment of the present invention, in step S102, the method for the camera terminal to divide the K blocks, the adjacent blocks, and the standard blocks includes:
s201, defining a segment initial curve phi, namely, giving a rectangular area as a segment initial boundary curve;
s202, determining the number of initial installation arrangement, a butt joint distribution function and an initial distribution function; setting the maximum iteration number N;
s203, judging whether the current iteration number reaches the maximum iteration number, if not, calculating all pixel points, calculating a new distribution function, evolving particle migration collision, and simultaneously tracking the new distribution function and density; stopping iteration until the absolute value of the number of the initial installation arrays minus the current density is less than 0.0001;
s204, finding a curve where ρ (x, t) is 0, that is, a new curve; outputting the curve and recording as the primary target segmentation result of the image;
s205, the camera terminal analyzes the obtained primary target segmentation result data on the basis of the primary target segmentation result data, and identifies a code set related to safety factors which need to be specified in the actual project;
s206, dividing the advanced quantity similar to part of information quantity into the same safety zone by using relevance analysis according to the safety requirement of the actual engineering; and obtaining simulation model values of the segmented K blocks, the adjacent blocks and the standard blocks.
In a preferred embodiment of the present invention, the initial installation arrangement number, the butt-joint distribution function, and the initial distribution function in step S202 are:
the initial installation array number ρ ═ spf (i);
butt distribution function
Initial distribution function
In a preferred embodiment of the present invention, in step S203, the particle migration collision evolution process includes:
wherein x is the position of the cellular particle; v. ofiI is more than or equal to 0 and less than or equal to 8; τ is the relaxation time; f. ofi(x, t) is the cell particle density moving along direction i;
fi eq(x, t) is a butt distribution function defined as: f. ofi eq(x，t)＝wiρ(x，t)；
spf is a signed pressure function, and the equation is:
the value range of the spf function is [ -1,1 [)]；c1And c2The average values of the brightness of the image inside and outside the contour are respectively expressed and are obtained by the following formula:
wherein i is 1, 2; w is a1Representing a contour inner region; w is a2Representing the outer region of the contour.
In a preferred embodiment of the present invention, the step S205 further includes: identifying data flow and control flow dependence of the safety advance by using an automatic symbolic program slice, wherein a function set comprises definition statements of the safety advance, the function set is continuously expanded in the process of slice analysis, and in order to obtain a minimized program subset, a slice rule is defined as follows:
tracing the data flow of the program as it executes from n to m, rule (1) indicating that propagation of the secret reference should be traced; rule (2) indicates that propagation of other parameters of the function needs to be tracked when the secret references are used as parameters of the function call; rule (3) indicates that propagation of a return value of a function needs to be tracked when a secret reference is used as a parameter of a function call; rule (4) indicates that when any reference to a secret is dereferenced, the secret and its reference need to be tracked;
and determining the information propagation in the system dependence graph SDG by using a Frama-c-static software analysis framework, sequentially and independently carrying out propagation analysis on the lead quantity in the s, recording the obtained lead quantity set as sfi, wherein sfi is continuously changed during iteration, stopping the analysis when the sfi and the reference set are not changed any more, and obtaining a large number of potential lead quantity sensitive function data values.
In a preferred embodiment of the present invention, the step S206 further includes:
representing the set of all the advance quantities p to which the advance quantity a is covered,
a set of all codes representing the propagation of the advance A;
definition 1: a similarity function sim (x, y) is a function that maps variables x, y into numbers in [0,1], measuring the similarity between x and y, sim (x, y) ═ 1 corresponds to objects x, y being the same, while sim (x, y) ═ 0 corresponds to very different objects;
using the Jaccard similarity coefficient used in the information retrieval as a similarity measure:
using a relevance threshold rho e [0, sim(s)1，s2)max]As a criterion for whether to partition variables into the same group, the relevance threshold represents how much performance a user of the software is willing to sacrifice in exchange for the security of the system; sim(s)1，s2) When the value is more than or equal to rho, the value of s is adjusted1，s2Divided into the same security zone group, sim(s)1，s2) If < rho, then s will be1，s2Dividing the slices into different safety zone groups, wherein overlapping parts exist among the slices meeting different variables in the dividing process; at ρ ═ sim(s)1，s2)maxThe automatic partitioning scheme stores each secret in a separate security zone; when ρ is 0, the final architecture degrades to that in the simulation model.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited only by the attached claims.
Claims (10)
1. A method for selecting pipe slice assembling point positions in shield construction is characterized by comprising the following steps:
analyzing the segment types, the assembly mode, the axis fitting, the shield tail clearance and the jack stroke difference; and selecting an assembling point position to ensure that the horizontal included angle alpha 2 between the duct piece and the design axis and the vertical included angle theta 2 between the duct piece and the design axis tend to be zero, reducing the included angle between the duct piece axis and the shield tail axis, reducing the friction probability between the duct piece and the shield tail, and preventing the shield tail from leaking and gushing water and sand.
2. The method for selecting the segment splicing point position in the shield construction method according to claim 1, wherein when the difference between the upper and lower or left and right stroke values of the hinged cylinder of the jack is large, an angle is formed between the shield middle body and the shield, the difference between the upper and lower or left and right stroke values is subtracted by the difference between the upper and lower or left and right stroke values of the hinged cylinder, and the final result is used as the basis for segment type selection.
3. The method for selecting the splicing point location of the pipe slice in the shield construction according to claim 1, wherein the method for selecting the splicing point location of the pipe slice in the shield construction specifically comprises:
selecting a duct piece model;
step two, selecting an assembling position;
thirdly, calculating the segment splicing point positions: according to the design axis trend of the proposed tunnel, the trend of the duct piece is in accordance with the line trend through the selection of the duct piece model and the assembling position.
4. The method for selecting the segment splicing point position in the shield construction method according to claim 3, wherein in the first step, the segment model selection specifically comprises:
the standard ring is added with a turning ring, the standard ring is used for a straight line section, and the turning ring is used for a curved line section; the turning rings comprise left and right turning wedge-shaped rings, and different curves are fitted with various combinations of the standard rings;
each ring pipe piece is provided with a wedge-shaped amount, and the universal ring is assembled at different point positions through K blocks, so that the requirements of fitting different curves and construction deviation correction are met;
the second step of assembling position selection comprises the following steps:
the assembly form comprises: assembling through seams and assembling staggered seams, wherein the assembling point positions of the K blocks of adjacent rings of the formed tunnel are positioned at the same position in the assembling process of the through seams; the staggered joint assembly is that the assembly point positions of adjacent ring K blocks of the formed tunnel are staggered;
when general ring section of jurisdiction is assembled, assemble ring and last ring section of jurisdiction C piece bottled position clockwise or anticlockwise rotation, utilize 2, 5 or 8 bolt holes to satisfy the fissure of displacement and assemble the requirement.
5. The method for selecting the splicing point position of the pipe sheet in the shield construction method according to claim 3, wherein the third step specifically comprises:
(1) segment typesetting:
calculating the arrangement mode of a turning ring and a standard ring of a curve section of an interval line according to the relation between the central angle of the curve and the deflection angle generated by the turning ring;
the calculation formula of the deflection angle of the turning ring is as follows:
θ＝2γ＝2arctgδ/D
in the formula: theta-deflection angle of deflection ring
Delta-half of the maximum wedge-shaped amount of the turn ring
D-segment diameter
Through calculation: θ is 0.382;
according to the calculation formula of the central angle:
a＝180L/πR；
in the formula: l-the length of the central line of a section of line and the radius of an R-curve are 400 m; substituting theta into a to obtain the value L;
when the duct pieces are typeset in the section with the vertical curve or the section with the horizontal curve and the vertical curve, the accumulated error caused by the vertical curve is adjusted and corrected by using a asbestos rubber plate as a caulking material;
(2) measuring the gap between the shield tail: the gap between the shield tail of the shield tunneling machine is 30-50mm, and the upper position, the lower position, the left position and the right position of the duct piece are measured before the duct piece is installed each time;
(3) calculating the posture and the oil cylinder stroke of the shield tunneling machine: the shield machine sets three virtual reference points: front, middle, back points; the front point is at the cutting opening of the shield machine, the middle point is at the splicing machine, and the rear point is at the tail shield of the shield machine; the shield automatic measuring system calculates the horizontal and vertical deviation of the front point and the rear point of the shield through measurement; calculating the direction of the axis of the shield tunneling machine as the attitude of the shield tunneling machine according to the deviation;
front point O1 coordinates X1, Y1, Z1 wherein X1 is horizontal deviation, Y1 is vertical deviation, Z1 is mileage;
midpoint O2 coordinates X2, Y2, Z2 wherein X2 is horizontal deviation, Y2 is vertical deviation, Z2 is mileage;
back point O3 coordinates X3, Y3, Z3 where X3 is the horizontal deviation, Y3 is the vertical deviation, Z3 is mileage;
horizontal trend and vertical trend are angle values, and numerical values are expressed in radians;
the level tends to be alpha 1 ═ X1-X3)/L;
the vertical trend theta 1 is (Y1-Y3)/L;
the axial line of the shield machine is set as a Z axis, the axial line of the duct piece is set as a Z1 axis, the axial direction of the duct piece is also decomposed into a horizontal direction X and a vertical direction Y, and the lengths of the oil cylinders represented by the four stroke sensors are respectively L upper, L lower, L left and L right;
the horizontal included angle alpha is (L right-L left)/L;
the vertical included angle theta is (L upper-L lower)/L upper and lower;
the left and right of L and the upper and lower of L are both 6.25 m;
calculating the included angle between the duct piece and the design axis after acquiring the included angle between the shield tunneling machine and the design axis and the included angle between the duct piece and the shield tunneling machine;
a horizontal included angle alpha 2 between the duct piece and the design axis is alpha 1+ alpha;
and the included angle theta 2 between the pipe piece and the design axis is theta 1+ theta.
6. The method for selecting the segment assembling point positions in the shield construction according to claim 1, further comprising:
acquiring three-dimensional image data of a segment posture in construction through a camera terminal; dividing the K blocks, the adjacent blocks and the standard blocks to obtain simulation model values of the divided K blocks, adjacent blocks and standard blocks; comparing and analyzing the advance quantity obtained by the change value of the wedge quantity of the duct piece noted between the inner ring and the outer ring, and then combining the actual needs of the project to obtain the duct piece matched with the splicing point position in the actual project;
the method specifically comprises the following steps:
marking K blocks, adjacent blocks and standard block names on an inner ring of a top plate, marking a wedge amount change value of a duct piece between the inner ring and an outer ring, when the duct piece selects an assembling point position, selectively assembling the top plate to move the K blocks to corresponding point positions of a bottom plate, performing addition and subtraction operation on the upper wedge amount change value, the lower wedge amount change value, the left wedge amount change value and the right wedge amount change value, and determining a preliminary estimation value of an advance amount;
acquiring three-dimensional image data of the posture of the duct piece in construction by using a camera terminal; dividing K blocks, adjacent blocks and standard blocks in the pipe sheet assembling point position selection device in the shield construction method to obtain simulation model values of the divided K blocks, adjacent blocks and standard blocks;
and step three, carrying out comparative analysis according to the preliminary estimation value for determining the advance quantity obtained in the step one and the simulation model value obtained in the step two, and then combining with the actual needs of the engineering to obtain the duct piece matched with the splicing point position in the actual engineering.
7. The method for selecting the splicing point location of the pipe sheet in the shield construction method according to claim 6, wherein in the second step, the method for segmenting the pipe sheet according to the K blocks, the adjacent blocks and the standard blocks by the camera terminal comprises the following steps:
step 1, defining a segment initial curve phi, namely, giving a rectangular area as a segment initial boundary curve;
step 2, determining the number of initial installation arrangement, a butt joint distribution function and an initial distribution function; setting the maximum iteration number N;
step 3, judging whether the current iteration times reach the maximum iteration times, if not, calculating all pixel points, calculating a new distribution function, evolving particle migration collision, and simultaneously tracking the new distribution function and density; stopping iteration until the absolute value of the number of the initial installation arrays minus the current density is less than 0.0001;
step 4, finding a curve with rho (x, t) equal to 0, namely a new curve; outputting the curve and recording as the primary target segmentation result of the image;
step 5, the camera terminal analyzes the obtained primary target segmentation result data on the basis of the primary target segmentation result data, and identifies a code set related to safety factors which need to be specified in the actual project;
step 6, dividing the advanced quantity with approximate partial information quantity into the same safety zone by using relevance analysis according to the safety requirement of the actual engineering; obtaining simulation model values of the segmented K blocks, the adjacent blocks and the standard blocks;
the initial installation arrangement number, the butt joint distribution function and the initial distribution function in the step 2 are as follows:
the initial installation array number ρ ═ spf (i);
butt distribution function
Initial distribution function
In step 3, the particle migration collision evolution process includes:
wherein x is the position of the cellular particle; v. ofiI is more than or equal to 0 and less than or equal to 8; τ is the relaxation time; f. ofi(x, t) is the cell particle density moving along direction i;
fi eq(x, t) is a butt distribution function defined as: f. ofi eq(x，t)＝wiρ(x，t)；
spf is a signed pressure function, and the equation is:
the value range of the spf function is [ -1,1 [)]；c1And c2The average values of the brightness of the image inside and outside the contour are respectively expressed and are obtained by the following formula:
wherein i is 1, 2; w is a1Representing a contour inner region; w is a2Representing the outline outer region;
the step 5 further comprises the following steps: identifying data flow and control flow dependence of the safety advance by using an automatic symbolic program slice, wherein a function set comprises definition statements of the safety advance, the function set is continuously expanded in the process of slice analysis, and in order to obtain a minimized program subset, a slice rule is defined as follows:
tracing the data flow of the program as it executes from n to m, rule (1) indicating that propagation of the secret reference should be traced; rule (2) indicates that propagation of other parameters of the function needs to be tracked when the secret references are used as parameters of the function call; rule (3) indicates that propagation of a return value of a function needs to be tracked when a secret reference is used as a parameter of a function call; rule (4) indicates that when any reference to a secret is dereferenced, the secret and its reference need to be tracked;
determining the propagation of information in a system dependency graph SDG by using a Frama-c-static software analysis framework, sequentially and independently carrying out propagation analysis on the lead quantity in { s }, recording the obtained lead quantity set as { sfi }, { sfi } continuously changes during iteration, stopping analysis when { sfi } and a reference set of { sfi } are not changed any more, and obtaining a large number of potential lead quantity sensitive function data values;
the step 6 further comprises the following steps:
representing the set of all the advance quantities p to which the advance quantity a is covered,
a set of all codes representing the propagation of the advance A;
definition 1: a similarity function sim (x, y) is a function that maps variables x, y into numbers in [0,1], measuring the similarity between x and y, sim (x, y) ═ 1 corresponds to objects x, y being the same, while sim (x, y) ═ 0 corresponds to very different objects;
using the Jaccard similarity coefficient used in the information retrieval as a similarity measure:
using a relevance threshold rho e [0, sim(s)1，s2)max]As a criterion for whether to partition variables into the same group, the relevance threshold represents how much performance a user of the software is willing to sacrifice in exchange for the security of the system; sim(s)1，s2) When the value is more than or equal to rho, the value of s is adjusted1，s2Divided into the same security zone group, sim(s)1，s2) If < rho, then s will be1，s2Dividing into different groups of security zones, which are subject to different variationsThere is an overlap between slices of the volume; at ρ ═ sim(s)1，s2) max, the auto-partition scheme deposits each secret into a separate security zone; when ρ is 0, the final architecture degrades to that in the simulation model.
8. A pipe slice assembling point position selecting device in shield construction for realizing the pipe slice assembling point position selecting method in the shield construction according to any one of claims 1 to 7 is characterized in that the pipe slice assembling point position selecting device in the shield construction is provided with a bottom plate and a top plate, a bearing is fixed in the center of the bottom plate, the upper end of the bearing penetrates through the top plate, and the top plate rotates along the bearing;
the bottom plate is uniformly divided into a plurality of parts by point location lines and is consistent with the position of a jack of the shield tunneling machine; the top plate comprises an inner ring and an outer ring, and the inner ring and the outer ring are drawn in equal proportion according to the proposed tunnel by using the duct pieces;
the inner ring is marked with K blocks, adjacent blocks and standard block names, and the wedge-shaped quantity change value of the pipe piece is marked between the inner ring and the outer ring.
9. The device for selecting the assembling point location of the pipe sheet in the shield construction according to claim 8, wherein the device for selecting the assembling point location of the pipe sheet in the shield construction further comprises:
the camera terminal is used for acquiring three-dimensional image data of the tube sheet posture in construction; dividing the K blocks, the adjacent blocks and the standard blocks to obtain simulation model values of the divided K blocks, adjacent blocks and standard blocks; and comparing and analyzing the advance obtained by the change value of the wedge-shaped quantity of the segment noted between the inner ring and the outer ring, and combining the actual needs of the engineering to obtain the segment matched with the splicing point position in the actual engineering.
10. An application of the segment assembling point position selection method in shield construction according to any one of claims 1 to 7 in tunnel construction.
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| CN116049969A (en) * | 2023-04-03 | 2023-05-02 | 中国建筑第六工程局有限公司 | Method for selecting point positions of universal wedge-shaped duct pieces |
| CN117407700A (en) * | 2023-12-14 | 2024-01-16 | 国网山东省电力公司莱芜供电公司 | Method for monitoring working environment in live working process |
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