CN116227005A - Three-dimensional digital construction method and system for underground transportation junction - Google Patents
Three-dimensional digital construction method and system for underground transportation junction Download PDFInfo
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Abstract
The invention provides a three-dimensional digital construction method and a system for an underground transportation junction. Meanwhile, combining a digital method of BIM and finite element simulation interaction, performing simulation, visual deduction and iterative optimization on a construction scheme; and performing hierarchical analysis and normalization value taking based on the main design requirements of each specialty and the corresponding proposed evaluation parameters such as control indexes, characteristic indexes and the like, and establishing an entropy calculation quantization analysis system, thereby realizing the quantization of optimizing balance in different multi-specialty influences aiming at the traffic hub construction scheme. And carrying out iteration optimization on the underground transportation junction construction scheme by a three-dimensional digitizing method and a minimum entropy value principle to obtain an optimal scheme capable of being quantitatively inspected.
Description
Technical Field
The invention relates to the fields of urban traffic construction, comprehensive transportation junction and underground space construction, in particular to a three-dimensional digital construction method and system for an underground transportation junction.
Background
The underground transportation hub project is a comprehensive system engineering, and has the characteristics of multiple points, long line, wide area, large investment scale, strong technical performance, small specialized division of work, multiple participating units and complex flow, and some engineering also relates to the existing line reconstruction in operation. The construction of underground transportation junction projects from survey design, construction to delivery operation forms a huge system, and the system has strict labor division and close cooperation and is mutually restricted.
The transportation hub construction scheme needs to meet the main design requirements of all professions at the same time, but the degree of meeting the special design requirements of a certain scheme is different, so that the balance of the special design schemes is realized, and the transportation hub construction scheme is difficult to define. Such as structural beam, plate, column size enlargement or position adjustment, structural scheme is advantageous, but can influence building function or building visual effect, can influence warm through-air area simultaneously, influences other specialty and overhauls the operation space, influences engineering cost. Most of the existing design methods adopt traditional manual adjustment and field comparison, the digital technology based on BIM and finite element interaction iterative optimization is less, the proprietary information in the construction scheme is high in isolation, the individual professions are easy to adjust, uncontrollable influence is easily brought to other professions, the professional error and the miss are more, the collaborative design mechanism is not clear, and the collaborative update is difficult to be performed in time; in addition, the scheme is mainly qualitatively judged, the satisfaction degree of scheme optimization among professions is difficult to intuitively judge, and a quantitative judgment system does not exist for the building scheme.
Therefore, how to realize the three-dimensional digital construction method of the underground transportation junction, and to optimize and quantify the balance in different multi-specialty influences aiming at the transportation junction construction scheme, the problem that engineering technicians need to solve is solved by obtaining the optimal scheme capable of being quantitatively examined.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention provides a three-dimensional digital construction method and system for an underground transportation junction, which combines a BIM and a finite element simulation interactive digital method to simulate, visually deduce and iterate and optimize a construction scheme, performs hierarchical analysis and normalization value taking based on evaluation parameters such as control indexes, characteristic indexes and the like correspondingly proposed by main design requirements of each specialty, establishes an entropy calculation quantization analysis system, and realizes the quantization of optimizing balance in different effects of multiple specialty aiming at the transportation junction construction scheme.
According to a first aspect of the present invention, there is provided a three-dimensional digital construction method of an underground transportation junction, comprising the steps of:
step 2, building a BIM refined three-dimensional model of the underground transportation junction, carrying out visual deduction on each sub-unit project and each process connection of field construction through a BIM technology, simulating the whole and regional construction process of the project, and extracting control index information of a transportation junction building JZ (n), an electromechanical JD (n) and a project economy GJ (n); introducing finite element analysis software by using the created BIM refined three-dimensional model to generate a structural analysis model, adding load and boundary condition information, and then carrying out finite element calculation and analysis to generate control index information of a structure JG (n);
Step 3, calculating the entropy value of the structural scheme in the nth iteration according to the obtained control index information of the structure JG (n), the building JZ (n), the electromechanical JD (n) and the engineering economy GJ (n)
Entropy value of construction scheme->
Entropy of electromechanical scheme>
And engineering economic entropy value->
And solving the total entropy value of the traffic hub construction scheme +.>
Wherein, when n=0, the initial state value of the corresponding construction scheme;
step 4, based on finite element analysis results, optimizing a structural scheme, feeding back to a building model of a traffic hub structure to be modified and adjusted in a BIM three-dimensional model, establishing a multi-specialty collaborative work mechanism, synchronously linking a modified BIM structural model working set to a building model working set and an electromechanical model working set through a shared data center set, carrying out specialty collaborative checking, adjustment and engineering quantity statistics on the BIM of the traffic hub building scheme, and carrying out visual deduction on a construction procedure through a BIM technology to obtain an adjusted and optimized BIM refined three-dimensional model; extracting control index information of the optimized transportation junction building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1);
step 5, importing the BIM refined three-dimensional model after adjustment and optimization into finite element software again, performing finite element calculation and analysis, and generating control index information of the structure JG (n+1);
Step 6, respectively calculating the entropy value of the structural scheme after the n+1th iteration according to the obtained control index information of the structure JG (n+1), the building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1)
Entropy value of construction scheme->
Entropy of electromechanical scheme>
Engineering economy scheme entropy value->
And solving the total entropy value of the transportation hub construction scheme after the n+1th iteration>
；
Step 7, returning to the step 4 to carry out a cyclic iteration process, and obtaining the total entropy value of the iterated traffic hub construction scheme
Stopping iteration when the convergence tends to occur; and determining the corresponding traffic hub construction scheme when the entropy tends to converge as an optimal scheme.
On the basis of the technical scheme, the invention can also make the following improvements.
Preferably, the preliminary construction of the underground transportation junction integrated construction scheme includes:
the three-ring lamination and multi-line radiation are used as basic forms, and the three-ring lamination of the ground motor vehicle loop, the underground non-motor vehicle loop and the underground traffic hall is adopted; a radial traffic line consisting of a highway tunnel and urban rail transit; the road system comprises a non-motor vehicle loop which is arranged below a city central road and communicated with a first layer of an underground space; underground corridor communicating with non-motor vehicle loop; a transfer passage formed by communicating the underground corridor with a plurality of subway lines; and highway tunnels which are arranged in a stacked and staggered manner with the subway lines, and connecting channels arranged on each layer of the underground space are communicated with each layer of the underground space.
Preferably, the total entropy value of the traffic hub construction scheme after the n+1th iteration is calculated
Comprising the following steps:
confirming characteristic indexes of control index information of a structure JG (n+1), a building JZ (n+1), an electromechanical JD (n+1) and an engineering economy GJ (n+1);
carrying out normalized value calculation on each characteristic index to obtain a scale value and a weight of the characteristic index;
solving the total entropy value of the traffic hub construction scheme according to the scale value and the weight
。
Preferably, the normalized value calculation is substituted into the following formula: when the characteristic index is a negative correlation characteristic index, namely the characteristic index with larger value is better, the characteristic index with larger value is smaller;
when the characteristic index is a positive correlation characteristic index, namely the characteristic index with smaller value is better, the characteristic index with smaller value is smaller;
wherein ,
normalized value representing characteristic index, ++>
Is the lower limit value of the characteristic index>
Is the upper limit value of the characteristic index,xis a specific value of the characteristic index.
Preferably, the determining the scale value and the weight of the characteristic index includes:
the judgment factors are compared pairwise, and when the importance between the judgment factor A and the judgment factor B is the same, the scale values of slightly large and obviously large are taken:
Wherein the K values of the same, slightly large and obviously large are respectively 1, 3 and 5; k=k-2, when K is smaller than 0, taking k=0; finally, the weights are determined from the scale values.
Preferably, the total entropy value of the transportation junction building scheme is calculated according to the scale value and the weight
The following formula is substituted:
wherein ,
、/>
、/>
、/>
the weight corresponding to the structural scheme entropy value, the construction scheme entropy value, the electromechanical scheme entropy value and the engineering economic entropy value of the transportation junction are respectively taken in a value range of 0-1; />
、/>
、/>
、/>
Respectively representing the structural scheme entropy value, the construction scheme entropy value, the electromechanical scheme entropy value and the engineering economic entropy value of the iterative nth traffic junction, wherein the value range is 0-100; n=1, 2.
Preferably, the total entropy value of the transportation hub construction scheme is minimum
The method comprises the following steps:
Preferably, the structural analysis model comprises a foundation pit supporting structural model and a main structural model.
Preferably, the optimizing the structural scheme based on the finite element analysis result, and feeding the structural scheme back to the building model of the traffic junction structure in the BIM three-dimensional model comprises:
the interface software is used for leading in the structure analysis software to generate a structure analysis model, load and boundary condition information are added, calculation and analysis are carried out, information such as stress, strain, displacement, internal force, reinforcement and the like of the structural member are generated, the structure arrangement, the size, the reinforcement and the like are optimized through finite element analysis, and the information is fed back to the BIM three-dimensional model for modification and adjustment.
According to a second aspect of the present invention, there is provided a three-dimensional digital construction system for an underground transportation hub, comprising:
the construction scheme construction module is used for preliminarily constructing an integrated construction scheme of the underground transportation junction;
the visual construction module is used for building a BIM refined three-dimensional model of the underground transportation junction, carrying out visual deduction on each sub-unit project and each process connection of site construction through a BIM technology, simulating the construction process of the whole project and the subarea, and extracting control index information of a transportation junction building JZ (n), an electromechanical JD (n) and an engineering economy GJ (n); introducing finite element analysis software by using the created BIM refined three-dimensional model to generate a structural analysis model, adding load and boundary condition information, and then carrying out finite element calculation and analysis to generate control index information of a structure JG (n);
the first data calculation module is used for calculating the entropy value of the structural scheme at the nth iteration time according to the obtained control index information of the structure JG (n), the building JZ (n), the electromechanical JD (n) and the engineering economy GJ (n)
Entropy value of construction scheme->
Entropy of electromechanical scheme>
And engineering economic entropy value->
And solving the total entropy value of the traffic hub construction scheme +. >
Wherein, when n=0, the initial state value of the corresponding construction scheme;
the iteration optimization module is used for optimizing the structural scheme based on the finite element analysis result, feeding the structural scheme back to the BIM three-dimensional model to modify and adjust the building model of the traffic hub structure, establishing a multi-specialty collaborative work mechanism, synchronously linking the modified BIM structural model working set to the building model working set and the electromechanical model working set through the shared data center set, carrying out specialty collaborative check, adjustment and engineering quantity statistics on the BIM of the traffic hub building scheme, and carrying out visual deduction on the construction procedure through the BIM technology to obtain the BIM refined three-dimensional model after adjustment and optimization; extracting control index information of the optimized transportation junction building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1);
a second data calculation module for reintroducing the BIM refined three-dimensional model after adjustment and optimization into the finite fieldThe meta software is used for carrying out finite element calculation and analysis to generate control index information of the structure JG (n+1); calculating the entropy value of the structural scheme after the n+1st iteration according to the obtained control index information of the structure JG (n+1), the building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1) 
Entropy value of construction scheme->
Entropy of electromechanical scheme>
Engineering economy scheme entropy value->
And solving the total entropy value of the transportation hub construction scheme after the n+1th iteration>
；
The scheme determining module is used for performing a cyclic iteration process and solving the total entropy value of the iterated traffic hub construction scheme
Stopping iteration when the convergence tends to occur; and determining the corresponding traffic hub construction scheme when the entropy tends to converge as an optimal scheme.
The invention has the technical effects and advantages that:
the invention provides a three-dimensional digital construction method and a system for an underground transportation junction, which are used for carrying out digital simulation, design iteration optimization and three-dimensional visual construction on an integrated construction scheme of the underground comprehensive transportation junction by combining BIM and finite element simulation interaction technology. On the basis of the integrated construction scheme of the underground transportation junction, the digital construction method based on BIM-finite element interaction carries out hierarchical analysis on the evaluation indexes of major design parameters of each specialty through the digital method of BIM model and finite element analysis, obtains entropy values of each specialty according to the proposed entropy value calculation method, and further obtains the total entropy value of the construction scheme of the transportation junction. And (3) carrying out iterative optimization on the traffic hub construction scheme by a digitizing method, and obtaining an optimal traffic hub construction scheme based on a minimum entropy principle. The method realizes the quantification of optimizing balance in different multi-specialty influences aiming at the transportation hub construction scheme, and obtains the optimal scheme capable of being quantitatively inspected.
Compared with the conventional overlapping arrangement scheme of all traffic lines, the integrated construction scheme with traffic fusion, space interaction and function provided by the invention saves underground space and investment, solves the problem of urban throat traffic, intensively utilizes urban resources, creates urban traffic junction and modern underground space with composite functions, communicates with a commercial center, promotes urban functions, drives sustainable development, creates graceful urban environment, reduces carbon emission, and has good social benefit and economic benefit.
Drawings
FIG. 1 is a flow chart of a three-dimensional digital construction method for an underground transportation junction according to an embodiment of the present invention;
FIG. 2 is a spatial representation of an integrated construction scheme for an underground transportation hub provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a mechanism of cooperation of building, structure and mechanics provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a spider-web ring beam centripetal radiation system according to an embodiment of the invention;
fig. 5 is a schematic diagram of the total entropy value provided in the embodiment of the present invention when the total entropy value tends to converge.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
With the development of economy and society, the traffic and business functions carried by the urban center are increasingly required. In the urban central throat area, the ground roads have heavy traffic, a plurality of structures and pipelines are built around, a plurality of subway lines, municipal road tunnels, commercial centers are blended, people and vehicles are interwoven, and long-term traffic congestion, people and vehicles streamline mixing and extremely high safety risks often occur. When comprehensive traffic design is carried out, the problem of interweaving factors such as municipal tunnels, subway lines, ground road traffic and the like at the same node needs to be considered in a limited space.
Factors to be considered in the comprehensive traffic function of the urban center include municipal underground tunnels, municipal ground roads, subway lines and the like, and aiming at the existing solution, a tiling mode or simple spatial overlapping mode is required to be changed into a spatial three-dimensional combination mode for realizing the intensive utilization of the land.
The conventional design scheme generally adopts a staggered connection scheme of a plurality of transfer stations or a plurality of tunnels, so that the function of the hinges is incomplete, the transfer is inconvenient, and the construction time sequence is disordered; the number of layers of the underground structure is increased, the depth of a foundation pit is increased, the transfer convenience is reduced, the implementation is difficult, and the manufacturing cost is high; some adopt ground, secret scheme that combines, underground, ground, overhead are spread on the plane or vertical overlapping combination, and the land occupies more, and the space effect is relatively poor, and is great to surrounding environment view influence.
How to effectively solve the problems in the underground space, the key technology for realizing the optimal functions of the urban central node, intensive resource utilization, convenient and safe construction and harmonious environmental landscapes and needing to be solved mainly comprises the following steps: the integrated construction key technology of the urban underground transportation junction is researched, the problems that urban central comprehensive transportation is smoothly operated, pedestrians, vehicles, environments and businesses are organically fused, circulation communication of transportation nodes is realized, external efficient connection is dredged, smooth traffic of a full transportation type is realized, and meanwhile economical efficiency and safety are ensured.
It can be appreciated that, based on the defects in the background technology, the embodiment of the invention provides a three-dimensional digital construction method of an underground transportation junction, specifically as shown in fig. 1, the method comprises the following steps:
the initially constructed underground transportation junction integrated construction scheme comprises the following steps: the three-ring lamination and multi-line radiation are used as basic forms, and the three-ring lamination of the ground motor vehicle loop, the underground non-motor vehicle loop and the underground traffic hall is adopted; a radial traffic line is formed by the highway tunnel and urban rail traffic; the road system comprises a non-motor vehicle loop which is arranged below a city central road and communicated with a first layer of an underground space; underground corridor communicating with non-motor vehicle loop; a transfer passage formed by communicating the underground corridor with a plurality of subway lines; and highway tunnels which are arranged in a stacked and staggered manner with the subway lines, and connecting channels arranged on each layer of the underground space are communicated with each layer of the underground space.
FIG. 2 is a schematic space diagram of an integrated construction scheme of an underground transportation hub according to an embodiment of the present invention; as shown in fig. 2, the integrated construction scheme of the underground transportation hub according to the embodiment of the invention adopts five-layer design, including a ground layer, an underground interlayer, a first underground layer, a second underground layer and a third underground layer; wherein,
the underground three layers are provided with second subway lines, and the stations of the second subway lines are provided with second subway stations, so that the passing requirements of the second subway stations and the sections are met;
the underground two-layer is provided with a first subway line and a second highway tunnel, a first subway platform is arranged at the first subway line platform, an up-down connection channel is arranged between the first subway platform and the second subway platform, and the connection channel comprises a lifting elevator or a stair;
a transfer hall, a corridor for connecting the transfer hall and a third subway line transfer channel are arranged on the underground layer, an up-down connection channel is arranged between the transfer hall and the first subway platform, and the connection channel comprises a lifting elevator or a stair and is used for passing pedestrians;
the underground interlayer is provided with a first highway tunnel, a third subway platform, a third subway line and a non-motor vehicle loop; the first highway tunnel and the first subway line platform are consistent in running direction and are arranged side by side, passengers enter the first underground layer (a transfer hall and a third subway line transfer passage) and enter the second underground layer (the first subway line platform and the second highway tunnel) and enter the first subway line platform for riding through a non-motor vehicle loop. The non-motor vehicle loop is used for passengers and the non-motor vehicles to cross the street, and the first highway tunnel is used for highway traffic along the north-south direction;
The ground layer is provided with ground traffic and a rotary island, and the rotary island is provided with a large sculpture;
in order to facilitate the passersby to pass up and down, streamline transfer stairs are respectively arranged among an underground three-layer (a second subway line platform), an underground two-layer (a second highway tunnel and a third subway line south line extension section), an underground one-layer (a transfer hall and a third subway line transfer passage) and an underground one-layer interlayer (a first subway line platform, a first highway tunnel and a non-motor vehicle loop).
The integrated construction scheme of the underground transportation junction skillfully provides a three-ring laminated multi-line radial layout form, which is in homodromous merging and heterodrous interchange, solves the problem of five-line intersection in an underground three-layer space, and adopts a through underground one layer as a subway transfer and transportation layer, so that escape, evacuation, fire protection and disaster prevention are realized simply and conveniently, and meanwhile, the underground three-layer space is communicated with peripheral businesses; placing the third ground wire platform and the first highway tunnel in an interlayer of an underground one-layer transfer hall to form a unique space layout of an overhead platform of the underground hall; in the next floor of hall, the first subway line platform can be reached to the upper floor; downward can directly reach a second subway line platform; the western station is communicated with a third subway line wide-field station; and the eastern direction is communicated with a south extension station of the third subway line. The second highway tunnel and the south line extension section of the third subway line are integrated in the same layer in the underground two layers.
The outline of the main body junction area of the underground transportation junction integrated construction scheme is circular, column nets are arranged along the circumferential direction and the radial direction according to the main passenger flow advancing direction, the circumferential frame column positions are strictly ensured, and the blocking of the circumferential cross-street passenger flow is avoided; the underground transportation junction integrated construction scheme is large in scale, and the underground one-layer column net adopts a large-span structure form, so that the space effect and the comfort level are improved.
Step 2, building a BIM refined three-dimensional model of the underground transportation junction, carrying out visual deduction on each sub-unit project and each process connection of field construction through a BIM technology, simulating the whole and regional construction process of the project, and extracting control index information of a transportation junction building JZ (n), an electromechanical JD (n) and a project economy GJ (n); introducing finite element analysis software by using the created BIM refined three-dimensional model to generate a structural analysis model, adding load and boundary condition information, and then carrying out finite element calculation and analysis to generate control index information of a structure JG (n);
the structural analysis model comprises a foundation pit supporting structure model and a main body structure model. The foundation pit supporting structure model comprises guard piles (walls), crown beams, supports, retaining walls, temporary upright posts and the like; the main body structure model comprises structural plates, upright posts, side walls, longitudinal beams, liang Jiaye and the like.
The construction process of the whole simulation engineering and the subareas comprises the following steps of:
the construction organization of the analog engineering such as the sectional construction, the building envelope construction, the earthwork excavation transportation and the like is organized and optimized, the BIM digital information technology is adopted, the accurate formwork supporting, the blanking and the construction of the complex special-shaped structure are realized, the technical problems never encountered by conventional stations such as the accurate construction of various slope-changing floors, the construction of the variable-section arc beam formwork supporting, the accurate construction of the inclined dome top plate, the manufacture and the assembly of the circular truncated cone-shaped steel mould of the structural column top, the layout of the ultra-large complex comprehensive pipeline and the like are successfully solved, the building materials and natural resources are effectively saved, the intelligent construction is practiced, and the construction cost and the construction period are saved.
In this embodiment, based on consideration of influence on the traffic hub construction scheme, each professional related index that the refined structure itself controls index or may be adjusted by the structure construction scheme is called a control index, which is specifically as follows:
1) The structural JG control index includes: JG1, JG2 with safe bearing capacity and JG3 with normal use performance are convenient to construct. The JG1, the safe JG2 and the JG3 normalized value range of the normal service performance are convenient to construct and are 0-100.
2) The building JZ control indexes comprise: building function JZ1, building effect JZ2, evacuation width JZ3, fire-resistant time limit JZ4. The integral value range of the building function JZ1, the building effect JZ2, the evacuation width JZ3 and the fire-resistant time limit JZ4 is 0-100.
3) The electromechanical JD control index includes: pipeline arrangement JD1, over-wind area JD2, drainage path JD3, equipment arrangement JD4, functional requirement JD5 and maintenance requirement JD6. The integral value range of the pipeline arrangement JD1, the wind passing area JD2, the drainage path JD3, the equipment arrangement JD4, the functional requirement JD5 and the maintenance requirement JD6 is 0-100. Wherein, the electromechanical JD control index comprises electromechanical and system multi-professional related indexes such as heating ventilation, interval, limit and the like.
4) Engineering economy GJ control index: engineering cost GJ1. The GJ1 normalization value range is 0-100. The engineering economy does not relate to modification of the BIM model, and engineering quantity statistics is carried out from the BIM model.
The control index can further provide characteristic indexes according to specific requirements of each specialty.
Step 3, calculating the entropy value of the structural scheme in the nth iteration according to the obtained control index information of the structure JG (n), the building JZ (n), the electromechanical JD (n) and the engineering economy GJ (n)
Entropy value of construction scheme- >
Entropy of electromechanical scheme>
And engineering economic entropy value->
And solving the total entropy value of the traffic hub construction scheme +.>
Wherein, when n=0, the initial state value of the corresponding construction scheme;
in this embodiment, the meaning of the entropy value is mainly used to measure the optimization degree of the scheme, and the larger the entropy value of the scheme is, the more unreasonable parts or problems of the scheme are described, and the larger the gap between the scheme and the optimal scheme is.
Step 4, based on finite element analysis results, optimizing a structural scheme, feeding back to a building model of a traffic hub structure to be modified and adjusted in a BIM three-dimensional model, establishing a multi-specialty collaborative work mechanism, synchronously linking a modified BIM structural model working set to a building model working set and an electromechanical model working set through a shared data center set, carrying out specialty collaborative checking, adjustment and engineering quantity statistics on the BIM of the traffic hub building scheme, and carrying out visual deduction on a construction procedure through a BIM technology to obtain an adjusted and optimized BIM refined three-dimensional model; extracting control index information of the optimized transportation junction building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1);
in this embodiment, the optimizing the structural scheme based on the finite element analysis result, and feeding back the structural scheme to the building model of the traffic junction structure for modification and adjustment in the BIM three-dimensional model includes: the interface software is used for leading in the structure analysis software to generate a structure analysis model, load and boundary condition information are added, calculation and analysis are carried out, information such as stress, strain, displacement, internal force, reinforcement and the like of the structural member are generated, the structure arrangement, the size, the reinforcement and the like are optimized through finite element analysis, and the information is fed back to the BIM three-dimensional model for modification and adjustment.
The method specifically comprises the following steps: and carrying out three-dimensional integral stress and deformation analysis on the foundation pit supporting structure by using deep foundation pit calculation software, and adjusting and optimizing the size and supporting arrangement of the enclosure structure. And carrying out structural integral stress analysis by using MIDAS/GEN, and carrying out component reinforcement calculation according to an internal force analysis result. And checking the MIDAS/GEN calculation result by using PKPM software, so as to ensure the accuracy of structural stress calculation.
Specifically, fig. 3 shows a schematic diagram of a building, a structure and an electromechanical collaboration mechanism; as shown in fig. 3, a multi-specialty collaborative work mechanism is established, a modified BIM structure model working set is synchronously linked to a building and electromechanical model working set through a shared data center set, specialty collaborative checking, adjustment and engineering quantity statistics are carried out on a traffic hub construction scheme BIM model, and a construction procedure is visually deduced through a BIM technology, so that an adjusted and optimized BIM refined three-dimensional model is obtained; the process can be iterated repeatedly until the reasonable and simple structural arrangement is optimized, and a circular + radial column network system and a spider web type ring beam centripetal radiation large-span structural system are formed, wherein a schematic diagram of the spider web type ring beam centripetal radiation system is shown in fig. 4. The blocking of structural members to the circumferential passenger flow and the shielding of large space vision are avoided to the greatest extent; the space between the main beams is skillfully utilized to provide laying conditions for the main equipment pipelines which are radially arranged, so that the net height of the underground space is saved; meanwhile, by combining the favorable conditions of the overhead platform, the area except the overhead platform is set as a high-traffic hall, so that the sense of depression of a large space and low clearance is effectively avoided.
Step 5, importing the BIM refined three-dimensional model after adjustment and optimization into finite element software again, performing finite element calculation and analysis, and generating control index information of the structure JG (n+1);
the structural JG (n+1) control index includes: JG1, JG2 with safe bearing capacity and JG3 with normal use performance are convenient to construct. The JG1, the safe JG2 and the JG3 normalized value range of the normal service performance are convenient to construct and are 0-100.
Step 6, respectively calculating the entropy value of the structural scheme after the n+1th iteration according to the obtained control index information of the structure JG (n+1), the building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1)
Entropy value of construction scheme->
Entropy of electromechanical scheme>
Engineering economy scheme entropy value->
And solving the total entropy value of the transportation hub construction scheme after the n+1th iteration>
；
The total entropy value of the traffic hub construction scheme after the n+1th iteration is calculated
Comprising the following steps:
confirming characteristic indexes of control index information of a structure JG (n+1), a building JZ (n+1), an electromechanical JD (n+1) and an engineering economy GJ (n+1);
carrying out normalized value calculation on each characteristic index to obtain a scale value and a weight of the characteristic index;
solving the total entropy value of the traffic hub construction scheme according to the scale value and the weight 
。
In step 5, control index information of the structure is obtained; each control index can be obtained by comprehensively analyzing each specific characteristic index through a weight function according to a hierarchical analysis method. The normalized value range of the characteristic index is 0-100, and the normalized calculation formula is as follows:
for the negative correlation characteristic indexes, namely the characteristic indexes with larger values and better values, the characteristic indexes with larger values are smaller in value;
for the positive correlation characteristic indexes, namely the characteristic indexes with smaller values and better values, the characteristic indexes with smaller values are smaller in value;
in the formula ,
normalized value representing characteristic index, ++>
Is the lower limit value of the characteristic index>
Is the upper limit value of the characteristic index,xis a specific value of the characteristic index.
And determining the weight of each layer of indexes by adopting a product scale method on the basis of a hierarchical analysis method according to the specific characteristics of the judging factors in the total entropy value judging system of the traffic hub structure construction scheme when the judging factors are compared in pairs. In the mutual comparison of these evaluation indicators, there are rarely cases of "strong" and "extremely large", since if one evaluation indicator is of relative importance "extremely large" or "strong" than the other evaluation indicator, it makes no sense to set the latter in the evaluation indicator system. Thus, it is mainly done for "same", "slightly large", "significantly large".
Further, the calculating the scale value and the weight of the characteristic index includes:
and qualitatively sorting the importance of the m judgment factors according to experience or actual measurement data. The judgment factors are compared pairwise, and when the importance between the judgment factor A and the judgment factor B is the same, the scale values of slightly large and obviously large are taken:
wherein the K values of the same, slightly large and obviously large are respectively 1, 3 and 5; k=k-2, and when K is smaller than 0, k=0 is taken.
From the above scale formula, the "same" scale value can be obtained
，
The weight is
；
Scale value of "slightly large
，
The weight is
；
Scale value of "significantly large
，
The weight is
。
And so on, the results of the two-by-two comparison of m judgment factors in the same layer are integrated, and the normalization condition is met, namely
And finally, obtaining the ordering weight of m judgment factors on the same layer in the total entropy value judgment system of the construction scheme of the transportation junction structure.
Finally, the total entropy value of the traffic hub construction scheme is calculated according to the scale value and the weight
Total entropy of transportation hub construction scheme>
Expressed as:
wherein ,
representing the total entropy value of the iterative nth traffic hub construction scheme,>
、/>
、/>
、/>
the weight corresponding to the structural scheme entropy value, the construction scheme entropy value, the electromechanical scheme entropy value and the engineering economic entropy value of the transportation junction are respectively taken as the value range of 0-1; / >
、/>
、/>
、/>
Respectively representing the structural scheme entropy value, the construction scheme entropy value, the electromechanical scheme entropy value and the engineering economic entropy value of the iterative nth traffic junction, wherein the value range is 0-100; n=1, 2. The method for weighting function values is described in detail above.
Step 7, returning to the step 4 to carry out a cyclic iteration process, and obtaining the total entropy value of the iterated traffic hub construction scheme
Stopping iteration when the convergence tends to occur; and determining the corresponding traffic hub construction scheme when the entropy tends to converge as an optimal scheme.
As shown in FIG. 5, after N iterations, the entropy tends to a fixed value, which may be considered the minimum total entropy
It can be considered that convergence is achieved, and the iteration is stopped, and the entropy value is made to converge to the minimum total entropy value +.>
The corresponding traffic hub construction scheme is determined as the optimal scheme.
Further, the minimum value of the total entropy value of the traffic hub construction scheme
Expressed as:
The construction scheme entropy value, the electromechanical scheme entropy value and the engineering economy entropy value are calculated by referring to the structural scheme entropy value calculation method. The description is omitted herein, and only the calculation of the entropy value of the structural scheme is taken as an example for emphasis description:
The structural JG control index includes: JG1, JG2 with safe bearing capacity and JG3 with normal use performance are convenient to construct. The JG1 convenient to construct, the JG2 safe in bearing capacity and the JG3 normalized in normal use performance range is 0-100.
Further, the characteristic indexes of the convenient JG1 for controlling index construction comprise: the construction period u1 and the man-machine consumption u2;
the characteristic indexes of the control index bearing capacity safety JG2 comprise: concrete strain u3, steel bar stress u4;
the characteristic indexes of the control index normal use performance JG3 comprise: the width u5 of the concrete crack and the deflection u6 of the flexural member.
1) Feature index normalization value calculation of JG1 convenient to control index construction
The value of the characteristic index construction period u1 is determined to be 24 months, the engineering construction period S2 determined by the project rigid plan is determined to be 18 months, the engineering construction period S1 of the excitation plan is determined to be 20 months, the engineering construction period x deduced by BIM three-dimensional visual simulation of the underground transportation junction integrated construction scheme is determined to be 20 months, and if the index is a positive correlation index, u1= (20-18)/(24-18) ×100=33.3.
The upper limit S2 of the human consumption determined by the project plan is assumed to be 30 hundred million yuan, the lower limit S1 of the human consumption is assumed to be 28 hundred million yuan, the human consumption x deduced by BIM three-dimensional visual simulation in the underground transportation junction integrated construction scheme is 29.5 hundred million yuan, and the index is a negative correlation index, and u2= (30-29.5)/(30-28) ×100=25.0.
From the viewpoint of the influence of the characteristic index construction period u1 and the man-machine consumption u2 on the control index construction convenience JG1, the construction period u1 is considered to be slightly larger than the man-machine consumption u2,
the scale values are: (construction period u1: man-machine consumption u 2) = (1.354:1)
The weight value is as follows: construction period u 1. Man-machine consumption u2 = 0.575:0.425
2) Feature index normalization value calculation for control index bearing capacity safety JG2
According to the specification and literature test research, the upper limit S2 of the concrete compressive strain is 1.7 per mill, the lower limit S1 of the concrete compressive strain is 0, the value of the concrete compressive strain x obtained by finite element analysis in the underground transportation junction integrated construction scheme is 0.9 per mill, and the index is a positive correlation index, and u2= (0.9 per mill-0)/(1.7 per mill-0) ×100=52.9.
According to the specification and literature test research, the upper limit S2 of the reinforcement stress is 400MPa, the lower limit S1 of the reinforcement stress is 0, the reinforcement stress x obtained by finite element analysis in the underground transportation junction integrated construction scheme is 260MPa, and the index is a positive correlation index, so that u4= (260-0)/(400-0) ×100=65.0.
From the viewpoint of the influence of the characteristic index concrete strain u3 and the reinforcing steel bar stress u4 on the control index bearing capacity safety JG2, the reinforcing steel bar stress u4 is considered to be slightly larger than the concrete strain u3,
the scale values are: (Steel bar stress u4: concrete strain u 3) = (1.354:1)
The weight value is as follows: reinforcing steel bar stress u4 concrete strain u3=0.575:0.425
3) Feature index normalization value calculation for control index normal use performance JG3
The value of the characteristic index concrete crack width u5 is 0.3mm, the upper limit S2 of the concrete crack width is 0, the lower limit S1 of the concrete crack width is 0 according to the standard and literature test research, the value of the concrete crack width x obtained through finite element analysis in the underground transportation junction integrated construction scheme is 0.18mm, and the index is a positive correlation index, and u5= (0.18-0)/(0.3-0) ×100=60.0.
The upper limit S2 of the deflection of the bending member is l/250mm, the lower limit S1 of the deflection of the bending member is 0, the deflection x of the bending member obtained by finite element analysis in the integrated construction scheme of the underground transportation junction is 3l/1000mm, and the index is a negative correlation index, namely u6= (3 l/1000-0)/(l/250-0) ×100=75.0.
Considering the influence of the characteristic indexes of the concrete crack width u5 and the deflection u6 of the flexural member on the normal use performance JG3 of the control index, the importance of the concrete crack width u5 and the deflection u6 of the flexural member is the same;
the scale values are: (concrete crack width u5: flexural member deflection u 6) = (1:1)
The weight value is as follows: concrete crack width u5:flexural member deflection u6=0.5:0.5
Table 1 structured JG control index calculation and value-taking example summary table
(2) Structural scheme entropy calculation
The values of the JG control indexes are shown in a table 1; construction of convenient JG1, bearing capacity safe JG2 and normal use performance JG3 from structural JG control indexes and entropy value of structural scheme
In consideration of influence, the bearing capacity safety JG2 is considered to be obviously larger than the construction convenience JG1, and the normal service performance JG3 is slightly larger than the construction convenience JG1.
The scale values are: (bearing capacity safety JG2: normal use Performance JG3: construction convenience JG 1) = (2.071: 1.354: 1)
The weight value is as follows: bearing capacity safety JG2 normal use performance JG3 convenient JG1=0.468:0.306:0.226
Thus, the structural scheme entropy q1=0.468×59.9+0.306×67.5+0.226×29.8=55.4.
In summary, compared with the conventional overlapping arrangement scheme of the traffic lines, the integrated solving method for traffic fusion, space interaction and function compounding provided by the invention saves underground space and investment, solves the problem of urban throat traffic, utilizes urban resources intensively, creates urban traffic junction and modern underground space with compound functions, communicates with a business center, promotes urban functions, drives sustainable development, creates graceful urban environment, reduces carbon emission, and has good social benefit and economic benefit.
According to a second aspect of the present invention, there is also provided a three-dimensional digital construction system for an underground transportation hub, the system comprising:
the construction scheme construction module is used for preliminarily constructing an integrated construction scheme of the underground transportation junction;
the visual construction module is used for building a BIM refined three-dimensional model of the underground transportation junction, carrying out visual deduction on each sub-unit project and each process connection of site construction through a BIM technology, simulating the construction process of the whole project and the subarea, and extracting control index information of a transportation junction building JZ (n), an electromechanical JD (n) and an engineering economy GJ (n); introducing finite element analysis software by using the created BIM refined three-dimensional model to generate a structural analysis model, adding load and boundary condition information, and then carrying out finite element calculation and analysis to generate control index information of a structure JG (n);
the first data calculation module is used for calculating the entropy value of the structural scheme at the nth iteration time according to the obtained control index information of the structure JG (n), the building JZ (n), the electromechanical JD (n) and the engineering economy GJ (n)
Entropy value of construction scheme->
Entropy of electromechanical scheme>
And engineering economic entropy value->
And solving the total entropy value of the traffic hub construction scheme +. >
Wherein, when n=0, the initial state value of the corresponding construction scheme;
the iteration optimization module is used for optimizing the structural scheme based on the finite element analysis result, feeding the structural scheme back to the BIM three-dimensional model to modify and adjust the building model of the traffic hub structure, establishing a multi-specialty collaborative work mechanism, synchronously linking the modified BIM structural model working set to the building model working set and the electromechanical model working set through the shared data center set, carrying out specialty collaborative check, adjustment and engineering quantity statistics on the BIM of the traffic hub building scheme, and carrying out visual deduction on the construction procedure through the BIM technology to obtain the BIM refined three-dimensional model after adjustment and optimization; extracting control index information of the optimized transportation junction building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1);
the second data calculation module is used for importing the BIM refined three-dimensional model after adjustment and optimization into finite element software again to perform finite element calculation and analysis, so as to generate control index information of the structure JG (n+1); calculating the entropy value of the structural scheme after the n+1st iteration according to the obtained control index information of the structure JG (n+1), the building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1) 
Entropy value of construction scheme->
Entropy of electromechanical scheme>
Engineering economy scheme entropy value->
And solving the total entropy value of the transportation hub construction scheme after the n+1th iteration>
；
The scheme determining module is used for performing a cyclic iteration process and solving the total entropy value of the iterated traffic hub construction scheme
Stopping iteration when the convergence tends to occur; and determining the corresponding traffic hub construction scheme when the entropy tends to converge as an optimal scheme.
It can be understood that the three-dimensional digital construction system for an underground transportation hub provided by the present invention corresponds to the three-dimensional digital construction method for an underground transportation hub provided by the foregoing embodiments, and the relevant technical features of the three-dimensional digital construction system for an underground transportation hub may refer to the relevant technical features of the three-dimensional digital construction method for an underground transportation hub, which are not described herein again.
In summary, the three-dimensional digital construction method and system for the underground transportation hub provided by the invention realize optimization of the transportation function of the urban central node, intensification of resource utilization, safe and convenient construction, and particularly have great application value for urban central transportation hub complexes with staggered transfer of multiple subway lines and cross fusion of multiple municipal roads, and have good application prospects.
It should be understood that parts of the specification not specifically set forth herein are all prior art.
It should be noted that, the foregoing description is only a preferred embodiment of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiment, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, and any modifications, equivalents, improvements or changes thereof may be made without departing from the spirit and principle of the present invention.
Claims (10)
1. The three-dimensional digital construction method of the underground transportation junction is characterized by comprising the following steps of:
step 1, initially constructing an integrated construction scheme of an underground transportation junction;
step 2, building a BIM refined three-dimensional model of the underground transportation junction, carrying out visual deduction on each sub-unit project and each process connection of field construction through a BIM technology, simulating the whole and regional construction process of the project, and extracting control index information of a transportation junction building JZ (n), an electromechanical JD (n) and a project economy GJ (n); introducing finite element analysis software by using the created BIM refined three-dimensional model to generate a structural analysis model, adding load and boundary condition information, and then carrying out finite element calculation and analysis to generate control index information of a structure JG (n);
Step 3, calculating the entropy value of the structural scheme in the nth iteration according to the obtained control index information of the structure JG (n), the building JZ (n), the electromechanical JD (n) and the engineering economy GJ (n)
Entropy value of construction scheme->
Entropy of electromechanical scheme>
And engineering economic entropy value->
And solving the total entropy value of the traffic hub construction scheme +.>
Wherein, when n=0, the initial state value of the corresponding construction scheme;
step 4, based on finite element analysis results, optimizing a structural scheme, feeding back to a building model of a traffic hub structure to be modified and adjusted in a BIM three-dimensional model, establishing a multi-specialty collaborative work mechanism, synchronously linking a modified BIM structural model working set to a building model working set and an electromechanical model working set through a shared data center set, carrying out specialty collaborative checking, adjustment and engineering quantity statistics on the BIM of the traffic hub building scheme, and carrying out visual deduction on a construction procedure through a BIM technology to obtain an adjusted and optimized BIM refined three-dimensional model; extracting control index information of the optimized transportation junction building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1);
step 5, importing the BIM refined three-dimensional model after adjustment and optimization into finite element software again, performing finite element calculation and analysis, and generating control index information of the structure JG (n+1);
Step 6. According to the obtained structure JG (n+1), building JZ (n+1), electromechanical JD (n+1) and engineering economy GJ (n+1)The control index information calculates the entropy value of the structural scheme after the n+1st iteration
Entropy value of construction scheme->
Entropy of electromechanical scheme>
Engineering economy scheme entropy value->
And the total entropy value of the traffic hub construction scheme after the n+1th iteration is calculated
；
Step 7, returning to the step 4 to carry out a cyclic iteration process, and obtaining the total entropy value of the iterated traffic hub construction scheme
Stopping iteration when the convergence tends to occur; and determining the corresponding traffic hub construction scheme when the entropy tends to converge as an optimal scheme.
2. The method for three-dimensional digitized construction of an underground transportation hub according to claim 1, wherein said preliminary construction of an underground transportation hub integrated construction scheme comprises:
the three-ring lamination and multi-line radiation are used as basic forms, and the three-ring lamination of the ground motor vehicle loop, the underground non-motor vehicle loop and the underground traffic hall is adopted; a radial traffic line is formed by the highway tunnel and urban rail traffic; the road system comprises a non-motor vehicle loop which is arranged below a city central road and communicated with a first layer of an underground space; underground corridor communicating with non-motor vehicle loop; a transfer passage formed by communicating the underground corridor with a plurality of subway lines; and highway tunnels which are arranged in a stacked and staggered manner with the subway lines, and connecting channels arranged on each layer of the underground space are communicated with each layer of the underground space.
3. The method for three-dimensional digitized construction of underground transportation junction according to claim 1, wherein the total entropy value of transportation junction construction scheme after n+1th iteration is calculated
Comprising the following steps:
confirming characteristic indexes of control index information of a structure JG (n+1), a building JZ (n+1), an electromechanical JD (n+1) and an engineering economy GJ (n+1);
carrying out normalized value calculation on each characteristic index to obtain a scale value and a weight of the characteristic index;
solving the total entropy value of the traffic hub construction scheme according to the scale value and the weight
。
4. A method of three-dimensional digitized construction of an underground transportation junction according to claim 3 wherein said normalized valued calculation is substituted into the formula: when the characteristic index is a negative correlation characteristic index, namely the characteristic index with larger value is better, the characteristic index with larger value is smaller;
when the characteristic index is a positive correlation characteristic index, namely the characteristic index with smaller value is better, the characteristic index with smaller value is smaller;
wherein ,
normalized value representing characteristic index，/>
Is the lower limit value of the characteristic index>
Is the upper limit value of the characteristic index,xis a specific value of the characteristic index.
5. A method of three-dimensional digitized construction of underground transportation junction according to claim 3 wherein deriving the scale values and weights of the characteristic indices comprises:
The judgment factors are compared pairwise, and when the importance between the judgment factor A and the judgment factor B is the same, the scale values of slightly large and obviously large are taken:
wherein the K values of the same, slightly large and obviously large are respectively 1, 3 and 5; k=k-2, when K is smaller than 0, taking k=0; finally, the weights are determined from the scale values.
6. A method of three-dimensional digitized construction of underground transportation junction according to claim 3, wherein said calculation of the total entropy of transportation junction construction scheme is based on scale values and weights
The following formula is substituted:
wherein ,
、/>
、/>
、/>
the weight corresponding to the structural scheme entropy value, the construction scheme entropy value, the electromechanical scheme entropy value and the engineering economic entropy value of the transportation junction are respectively taken in a value range of 0-1; />
、/>
、/>
、/>
Respectively representing the structural scheme entropy value, the construction scheme entropy value, the electromechanical scheme entropy value and the engineering economic entropy value of the iterative nth traffic junction, wherein the value range is 0-100; n=1, 2.
7. The method for three-dimensional digitized construction of underground transportation junction according to claim 1, wherein the calculated total entropy value of the iterated transportation junction construction scheme
In the case of convergence, at this time, the total entropy of the traffic junction construction scheme +. >
Is minimum +.>
The method comprises the steps of carrying out a first treatment on the surface of the Expressed as:
8. The method of claim 1, wherein the structural analysis model comprises a foundation pit supporting structure model and a main body structure model.
9. The method according to claim 1, wherein the optimizing the structure scheme based on the finite element analysis result, and feeding back the optimized structure scheme to the BIM three-dimensional model to modify and adjust the building model of the traffic hub structure comprises:
the structural analysis software is imported through the interface software to generate a structural analysis model, load and boundary condition information are added, calculation and analysis are carried out, stress, strain, displacement, internal force and reinforcement information of the structural member are generated, structural arrangement, size and reinforcement are optimized through finite element analysis, and the structural arrangement, size and reinforcement information is fed back to the BIM three-dimensional model to be modified and adjusted.
10. A three-dimensional digital construction system for an underground transportation hub, comprising:
the construction scheme construction module is used for preliminarily constructing an integrated construction scheme of the underground transportation junction;
the visual construction module is used for building a BIM refined three-dimensional model of the underground transportation junction, carrying out visual deduction on each sub-unit project and each process connection of site construction through a BIM technology, simulating the construction process of the whole project and the subarea, and extracting control index information of a transportation junction building JZ (n), an electromechanical JD (n) and an engineering economy GJ (n); introducing finite element analysis software by using the created BIM refined three-dimensional model to generate a structural analysis model, adding load and boundary condition information, and then carrying out finite element calculation and analysis to generate control index information of a structure JG (n);
A first data calculation module for calculating the nth iteration according to the obtained control index information of the structure JG (n), the building JZ (n), the electromechanical JD (n) and the engineering economy GJ (n)Entropy value of structural scheme
Entropy value of construction scheme->
Entropy of electromechanical scheme>
And engineering economic entropy value->
And solving the total entropy value of the traffic hub construction scheme +.>
Wherein, when n=0, the initial state value of the corresponding construction scheme;
the iteration optimization module is used for optimizing the structural scheme based on the finite element analysis result, feeding the structural scheme back to the BIM three-dimensional model to modify and adjust the building model of the traffic hub structure, establishing a multi-specialty collaborative work mechanism, synchronously linking the modified BIM structural model working set to the building model working set and the electromechanical model working set through the shared data center set, carrying out specialty collaborative check, adjustment and engineering quantity statistics on the BIM of the traffic hub building scheme, and carrying out visual deduction on the construction procedure through the BIM technology to obtain the BIM refined three-dimensional model after adjustment and optimization; extracting control index information of the optimized transportation junction building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1);
the second data calculation module is used for importing the BIM refined three-dimensional model after adjustment and optimization into finite element software again to perform finite element calculation and analysis to generate control index information of the structure JG (n+1); calculating the entropy value of the structural scheme after the n+1st iteration according to the obtained control index information of the structure JG (n+1), the building JZ (n+1), the electromechanical JD (n+1) and the engineering economy GJ (n+1) 
Entropy of building schemeValue->
Entropy of electromechanical scheme>
Engineering economy scheme entropy value->
And solving the total entropy value of the transportation hub construction scheme after the n+1th iteration>
；
The scheme determining module is used for performing a cyclic iteration process and solving the total entropy value of the iterated traffic hub construction scheme
Stopping iteration when the convergence tends to occur; and determining the corresponding traffic hub construction scheme when the entropy tends to converge as an optimal scheme. />
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