CN112487541A - Underground continuous wall reinforcement cage manufacturing and hoisting construction method - Google Patents
Underground continuous wall reinforcement cage manufacturing and hoisting construction method Download PDFInfo
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Abstract
A construction method for manufacturing and hoisting an underground continuous wall reinforcement cage comprises the steps of S1, establishing a three-dimensional field ground plane layout drawing in Revit software to form a project BIM model; s2, creating a steel reinforcement cage in the project BIM model to manufacture a fetal membrane frame; s3, gradually establishing a three-dimensional model of the reinforcement cage in Revit software, and performing visualized intersection and reinforcement cage acceptance by using the model; s4, calculating the weight G of the reinforcement cage by using Revit software; s5, carrying out lifting calculation on the reinforcement cage according to the size, the weight and the like of the reinforcement cage; s6, carrying out dynamic simulation and visual bottom crossing on the hoisting process of the reinforcement cage; and S7, summarizing and optimizing the construction process after the construction is finished. The invention combines the BIM technology with the manufacturing and hoisting construction of the reinforcement cage of the underground continuous wall, so that the whole construction process has high visualization degree, is clear and intuitive, is easy to check and prejudge, is beneficial to improving the construction precision and quality, utilizes the BIM technology to carry out three-dimensional visualization bottom-meeting and acceptance check, is easier for workers to understand and master the construction process, and has high working efficiency.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a manufacturing and hoisting construction method of an underground continuous wall reinforcement cage.
Background
The underground continuous wall is a foundation pit enclosure structure which is more and more widely applied, is a reinforced concrete structure, and needs to be manufactured and hoisted with a reinforcement cage before concrete is poured. The underground continuous wall steel reinforcement cage is usually placed after the underground continuous wall is grooved, and a large number of embedded parts exist, so that the requirement on the manufacturing accuracy of the steel reinforcement cage is high; in addition, underground continuous wall steel reinforcement cage volume, weight are great, and the degree of difficulty is big during hoist and mount, and the safety risk is high.
The traditional underground continuous wall steel reinforcement cage is usually manufactured and processed by means of a two-dimensional construction drawing, so that space conflicts in the drawing are difficult to find, and the processing precision of the steel reinforcement cage is difficult to ensure; in the hoisting operation of the reinforcement cage of the underground continuous wall, the operation is usually based on construction experience, effective theoretical calculation support is lacked, certain guidance is lacked when workers meet the bottom, and the operation is not visual and vivid. Therefore, the traditional construction method for manufacturing and hoisting the reinforcement cage of the underground continuous wall has certain hidden trouble in the aspect of quality safety control.
Disclosure of Invention
The invention aims to provide a construction method for manufacturing and hoisting an underground continuous wall reinforcement cage, which combines the BIM technology with the manufacturing and hoisting construction of the underground continuous wall reinforcement cage, provides a reliable theoretical calculation foundation, and has the advantages of high construction precision, clearness, intuition, high three-dimensionality, high visualization degree, reliable quality, safety and controllability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction method for manufacturing and hoisting a reinforcement cage of an underground continuous wall is characterized by comprising the following steps:
s1, establishing a three-dimensional field floor plan in Revit software to form a project BIM model;
s2, creating a steel reinforcement cage in the project BIM model to manufacture a tire membrane frame for guiding field construction and acceptance inspection;
s3, gradually establishing a three-dimensional model of the reinforcement cage in Revit software, and performing visualized intersection and reinforcement cage acceptance by using the model;
s4, calculating the weight G of the reinforcement cage by using Revit software;
s5, carrying out lifting calculation on the reinforcement cage according to the size, the weight and the like of the reinforcement cage;
the method specifically comprises the following steps:
s51, according to the weight G of the reinforcement cage obtained in the step S4 and the weight G' of the additional load of the lifting hook and the lifting rigging, the total weight G of the lifting is hoistedGeneral assembly= G + G'; the type selection of the hoisting machinery is always carried out according to the total hoisting weight G, the most unfavorable working condition of a main crane in the hoisting operation of the steel reinforcement cage is that the main crane walks in a load mode after the steel reinforcement cage is vertical, and the hoisting safety factor of the main crane is KMaster and slaveThen, the main crane is required to have the type-selecting hoisting capacity [ FMaster and slave]Reach the calculation hoisting capacity F of the main craneMaster and slaveI.e. satisfy [ FMaster and slave]＞FMaster and slaveIn which F isMaster and slave=GGeneral assembly/KMaster and slave；
The bearing load of the auxiliary crane is 70 percent G under the worst working conditionGeneral assemblyThe lifting safety coefficient of the auxiliary crane is KAuxiliary setThen, the auxiliary crane is required to select the type lifting capacity [ FAuxiliary set]To achieve the calculation lifting capacity K of the auxiliary craneAuxiliary setI.e. satisfy [ FAuxiliary set]＞FAuxiliary setIn which F isAuxiliary set=70%GGeneral assembly/KAuxiliary set；
The maximum allowable lifting height [ H ] of the main crane reaches the calculated lifting height H, namely [ H ] is more than H. The method comprises the following steps that the lifting height H = b + H1+ H2+ H3+ H4+ H5 is calculated for a steel reinforcement cage, wherein b is the distance between the center of a lifting hook and an arm end, H1 is the height of a steel wire rope above a carrying pole, H2 is the height of the carrying pole, H3 is the height of a steel wire rope below the carrying pole, H4 is the length of the steel reinforcement cage, H5 is the height of the steel reinforcement cage from the ground, and then the maximum allowable lifting height [ H ] > H is selected by inquiring a description of a crawler crane so as to meet requirements;
s52, determining the position of a lifting point according to the length of the reinforcement cage, wherein the determination of the position of the lifting point is a key step in the lifting process, and the position is determined according to a bending moment balance law, namely-M = + M, wherein + M is the positive bending moment value of the reinforcement cage; -M-value of the hogging moment of the reinforcement cage; because the bending moment deformation of the reinforcement cage of the underground continuous wall is the minimum when the positive and negative bending moments are equal, the distance between the hoisting points is the most reasonable when the position of the hoisting point of the reinforcement cage is determined according to the principle that the positive and negative bending moments are equal;
s53, calculating the stress condition of the sling according to the weight G of the steel reinforcement cage, the arrangement of lifting points and the static balance principle, and selecting the type of the sling;
for the main crane, the most unfavorable state of the stress of the hoisting rigging is that the weight of the steel reinforcement cage is borne by the main crane alone after the steel reinforcement cage is vertical, n steel wire ropes are arranged under the carrying pole for load distribution, so that the stress of a single steel wire rope under the carrying pole of the main crane is Fs1=GGeneral assembly/2n, wherein GGeneral assemblyHoisting the total weight; n is the number of steel wire ropes under the carrying pole;
for an auxiliary crane, when the reinforcing cage is horizontally hoisted by a double crane, the stress of a hoisting rigging is the most unfavorable state, and according to static balance conditions, the following steps are obtained: gGeneral assembly=FCombination of Chinese herbs，GGeneral assemblyHoisting the total weight; fCombination of Chinese herbs-a calculated vertical resultant force;
taking a moment from one end of the reinforcement cage, and balancing according to the bending moment to obtain: the calculated resultant bending moment Ma = 0;
the maximum stress F of a single steel wire rope of the auxiliary crane can be obtained through calculationS3；
All the hoisting rigging stresses such as steel wire ropes, pulleys and the like can be obtained according to the static balance principle;
s54, combining the weight of the reinforcement cage and the load of the crane, and considering the most unfavorable working condition to carry out the rechecking and checking calculation of the bearing capacity of the foundation, if not, taking corresponding measures;
s6, carrying out dynamic simulation and visual bottom crossing on the hoisting process of the reinforcement cage;
and S7, summarizing and optimizing the construction process after the construction is finished.
Further, the step S1 specifically includes:
s11, before modeling, establishing a project-level BIM template model, unifying elevation and coordinate positioning, and unifying component naming rules and management standards;
s12, when modeling, importing the electronic drawing in the AutoCAD into Revit software through a connection command, and ensuring that base points are overlapped; and generating a three-dimensional model for each partition and component in the floor plan by creating a family command, and giving corresponding sizes and materials to the three-dimensional model to form a project BIM model.
Further, the step S2 specifically includes:
s21, building a steel reinforcement cage manufacturing and stacking area in the BIM, creating a steel reinforcement cage manufacturing and tire film frame model according to the size and the shape of the steel reinforcement cage of the underground diaphragm wall, and extracting the position and elevation information of the tire film frame model for on-site construction measurement and positioning;
and S22, after the construction of the on-site steel reinforcement cage tire membrane frame is completed, checking and accepting by using a tire membrane frame BIM model.
Further, the step S3 specifically includes:
s31, generating steel bars by adopting a group creating command in Revit software, generating single steel bars by a lofting command according to a reinforcement cage reinforcement map, and arranging the steel bars by adopting commands such as arrays and the like according to the spacing of the steel bars to form a three-dimensional model of the reinforcement cage;
s32, leading a BIM model of the reinforcement cage in Revit software into Navisvarks software, checking whether conflicts exist in the arrangement of each component in the reinforcement cage by using collision and error checking functions of the Navisvarks software, and optimizing again if conflicts exist;
and S33, performing visual bottom crossing by using the optimized BIM model of the reinforcement cage to guide construction, and performing on-site inspection and acceptance by using the BIM model of the reinforcement cage after the reinforcement cage is processed.
Further, the step S4 specifically includes automatically counting volume information of each component according to the three-dimensional reinforcement cage model created in the step S31 through a detailed table in Revit software, and extracting the reinforcement volume V of the reinforcement cage of the underground continuous wall by a keyword filtering function, and multiplying the reinforcement volume V by the steel density ρ to obtain the weight G of the reinforcement cage, that is, G = ρ V, where the weight G of the reinforcement cage is used as a basis for material entry and reinforcement cage hoisting calculation.
Further, the step S6 specifically includes: the BIM model in the Revit software is exported to an NWC file, the NWC file is imported to NavisWorks software for construction simulation, construction simulation animations of processes of crane station position, lifting, walking, lowering and the like in steel reinforcement cage lifting construction are formed, and visual bottom crossing of steel reinforcement cage lifting is carried out on constructors.
More preferably, the step S7 specifically includes, after the fabrication and hoisting operations of the first reinforcement cage are completed, summarizing experience, perfecting the BIM model and the construction method, and guiding the fabrication and hoisting of the subsequent reinforcement cage.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
the invention combines the BIM technology with the manufacturing and hoisting construction of the reinforcement cage of the underground continuous wall, so that the whole construction process has high visualization degree, is clear and intuitive, is easy to check and prejudge, and is beneficial to improving the construction precision and quality;
the invention utilizes BIM technology to carry out three-dimensional visual bottom-meeting and acceptance inspection, so that workers can understand and master the construction process more easily, and the working efficiency is high;
according to the invention, the weight of the reinforcement cage can be accurately calculated through the engineering quantity statistics in the BIM model, on one hand, the weight of the reinforcement cage can be used as a basis for purchasing reinforcement to enter a field, so that the material waste is reduced, and on the other hand, an accurate load value is provided for the hoisting calculation of the reinforcement cage.
The invention provides a theoretical calculation method for hoisting the reinforcement cage, avoids the defect of dependence on construction experience in the traditional construction, has a basis for hoisting construction of the reinforcement cage, and has the advantages of safety and controllability.
Drawings
FIG. 1 is a flow chart of the construction method for manufacturing and hoisting the reinforcement cage of the underground continuous wall;
FIG. 2 is a schematic diagram illustrating calculation of hoisting height of a reinforcement cage;
FIG. 3 is a schematic diagram of calculation of a steel reinforcement cage lifting point;
FIG. 4 is a schematic view of reinforcement cage hoisting point arrangement and hoist rigging arrangement;
FIG. 5 is a schematic view of the main hoist rigging calculation;
FIG. 6 is a schematic view of the calculation of the hoist rigging of the auxiliary hoist;
FIG. 7 is a schematic view of a construction road structure;
fig. 8 is a schematic view of load diffusion.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
FIG. 1 is a schematic flow chart of a preferred embodiment of a construction method for manufacturing and hoisting an underground continuous wall reinforcement cage.
In the preferred embodiment, the construction method for manufacturing and hoisting the reinforcement cage of the underground continuous wall comprises the following steps:
s1, establishing a three-dimensional field floor plan in Revit software to form a project BIM model;
s2, creating a steel reinforcement cage in the project BIM model to manufacture a tire membrane frame, and guiding site construction and acceptance;
s3, gradually establishing a three-dimensional model of the reinforcement cage in Revit software, and performing visualized intersection and reinforcement cage acceptance by using the model;
s4, calculating the weight G of the reinforcement cage by using Revit software;
s5, carrying out lifting calculation on the reinforcement cage according to the size, the weight and the like of the reinforcement cage;
s6, carrying out dynamic simulation and visual bottom crossing on the hoisting process of the reinforcement cage;
and S7, summarizing and optimizing the construction process after the construction is finished.
Step S1 specifically includes:
s11, before modeling, establishing a project-level BIM template model, unifying elevation, coordinate positioning and the like, and unifying component naming rules and management standards;
s12, when modeling, importing the electronic drawing in the AutoCAD into Revit software through a connection command, and ensuring that base points are overlapped; and generating a three-dimensional model for each partition and component in the floor plan by creating a family command, and giving corresponding sizes and materials to the three-dimensional model to form a project BIM model.
Step S2 specifically includes:
s21, building a steel reinforcement cage manufacturing and stacking area in the BIM, creating a steel reinforcement cage manufacturing and tire film frame model according to the size and the shape of the steel reinforcement cage of the underground diaphragm wall, and extracting the position and elevation information of the tire film frame model for on-site construction measurement and positioning;
and S22, after the construction of the on-site steel reinforcement cage tire membrane frame is completed, checking and accepting by using a tire membrane frame BIM model.
Step S3 specifically includes:
s31, generating steel bars by adopting a group creating command in Revit software, generating single steel bars by a lofting command according to a reinforcement cage reinforcement map, and arranging the steel bars by adopting commands such as arrays and the like according to the spacing of the steel bars to form a three-dimensional model of the reinforcement cage;
s32, leading a BIM model of the reinforcement cage in Revit software into Navisvarks software, checking whether conflicts exist in the arrangement of each component in the reinforcement cage by using collision and error checking functions of the Navisvarks software, and optimizing again if conflicts exist;
and S33, carrying out visual bottom crossing by using the optimized BIM model of the reinforcement cage to guide construction, and carrying out on-site inspection and acceptance by using the model after the reinforcement cage is processed.
Step S4 specifically includes: by utilizing a detailed table of Revit software, the volume of the reinforcement cage of the underground continuous wall can be extracted through a keyword filtering function, and the volume is multiplied by the reinforcement density to obtain the weight of the reinforcement cage, which is used as a basis for material entering and a basis for reinforcement cage hoisting calculation. After the model is created, the model can automatically count the volume information of each component through a detailed table in Revit software, and the volume of the reinforcement cage steel bar is V =13.2 cubic meters through filtering keywords.
Then in this example, the weight of the reinforcement cage is: g = ρ V =13.2 × 7.85=103.6t
Step S5 specifically includes, but is not limited to, the following: the method comprises the following steps of checking and calculating the hoisting capacity of the crane, determining the position of a hoisting point, selecting the type of a hoisting rigging, checking and calculating the bearing capacity of a foundation and the like, and specifically comprises the following steps:
s51, selecting the type of the hoisting machinery according to the weight of the reinforcement cage and the additional load weight obtained in the Revit software, and checking the hoisting height besides the hoisting capacity of the crane;
the self weight of the reinforcement cage obtained in the step S41 is as follows: g =103.6t, and considering that the weight of the additional load such as a hook, a sling and the like is G' =15t, the total hoisting weight is: gGeneral assembly=G+G’=103.62+15=118.62t。
To the main loop wheel machine in the steel reinforcement cage jack-up operation, the most unfavorable operating mode is the walking of the vertical back main loop wheel machine independent load of steel reinforcement cage, and jack-up factor of safety is 0.7, then requires main loop wheel machine hoisting capacity to reach at least: fMaster and slave=GGeneral assembly/KMaster and slave=118.62/0.7=169.5t。
The main crane in this example adopts ZCC5200S type crawler crane, selects the operating mode to be: the arm length is 84m, the turning radius is 16m, and an 80t super-lifting weight is configured, and through inquiring the technical performance specification of the crawler crane of the model, the lifting capacity is allowed to be 176t under the working condition, namely [ F [)Master and slave]=176t＞FMaster and slaveAnd =169.5t, the lifting capacity of the main crane meets the requirement.
For the auxiliary crane in the hoisting operation of the reinforcement cage, the load is borne only in the process of horizontally hoisting and turning over the reinforcement cage, and the load borne by the auxiliary crane is generally not more than 70% of the total hoisting weight, so that the load borne by the auxiliary crane under the most unfavorable working condition is as follows: 70% GGeneral assemblyAnd =0.7 × 118.62=83.03t, and the safety factor of the auxiliary crane lifting is 0.8, the lifting capacity of the auxiliary crane is required to at least reach: fAuxiliary set=70%GGeneral assembly/KAuxiliary set=83.03/0.8=103.8t。
The auxiliary crane in this example adopts XGC260 type crawler crane, selects the operating mode to be: the working condition of the main arm with the arm length of 51m and the turning radius of 12m allows the lifting capacity to be 109t, namely [ F ] under the working condition by inquiring the technical performance specification of the crawler crane of the modelAuxiliary set]=109t＞FAuxiliary setAnd =103.8t, the lifting capacity of the auxiliary crane meets the requirement.
Fig. 2 is a schematic diagram of calculation of hoisting height of the reinforcement cage. The distance b between the center of the lifting hook and the arm end is =6.5m, the height h1 of a steel wire rope above the carrying pole is =2.8m, the height h2 of the carrying pole is =0.8m, the height h3 of a steel wire rope below the carrying pole is =5m, the length h4 of a steel reinforcement cage is =59.5m, the height h5 of the steel reinforcement cage from the ground is =0.5m, and then the hoisting height of the steel reinforcement cage is at least required: h = b + H1+ H2+ H3+ H4+ H5=6.5+2.8+0.8+5+59.5+0.5=75.1 m. By inquiring the description of the crawler crane, when the arm length is 84m and the turning radius is 16m, the maximum allowable lifting height [ H ] =84m > H =75.1m meets the requirement.
S52, determining the position of a hoisting point of the steel reinforcement cage according to the length of the steel reinforcement cage and the principle that positive and negative bending moments are equal;
fig. 3 is a schematic diagram of calculation of a steel reinforcement cage lifting point. The determination of the position of the hoisting points is a key step in the hoisting process, and according to the bending moment balance law, the bending moment deformation of the underground continuous wall reinforcement cage with equal positive and negative bending moments is minimum, so that the distance between the hoisting points is most reasonable. The overall length of the reinforcement cage in this example is L =59.5 m.
making-M = + M (+ M-reinforcing cage positive bending moment value, -M-reinforcing cage negative bending moment value); wherein + M =1/2ql1 2，-M=1/8ql2 2-1/2ql1 2
Then the process of the first step is carried out,
and the following steps: 2l1+5l2=L=59.5m
Obtaining: l1=3.75m，l2=10.4m
Combining the arrangement condition of the reinforcing steel bars of the reinforcement cage, the distance between the lifting points of the 1 st row is 1m from the cage head, the distance between the lifting points of the other rows is 11m, the actual construction requirement can be met, the theoretical calculation result is also approached, and the optimal scheme is shown in the figure 4 for the arrangement of the lifting points and the arrangement of the corresponding lifting rigging.
S53, calculating the stress condition of the sling according to the weight of the reinforcement cage, the arrangement of lifting points and the static balance principle, and selecting the type of the sling;
for the main crane, the state that the sling is most stressed is that the weight of the reinforcement cage is borne by the main crane alone after the reinforcement cage is vertical, as shown in fig. 5. 4 steel wire ropes are respectively arranged at each row of lifting points for load distribution, so that the stress of a single steel wire rope below the carrying pole of the main crane is as follows: fs1=GGeneral assembly/8=118.62/8=14.83t
For the auxiliary crane, the hoisting rigging is stressed in the most unfavorable state when the double cranes horizontally hoist the reinforcement cage, as shown in fig. 6. According to the static equilibrium conditions:
vertical stress of the steel reinforcement cage: gGeneral assembly=FCombination of Chinese herbs=2×Sin48°×F1+2×Sin48°×F3=118.62t
Wherein the content of the first and second substances,
Sin48°×F1=2×Sin48°×F2，
Sin48°×F3=2×Sin48°×F4
taking a moment by using a halter, and balancing Ma =0 according to the bending moment, namely:
1×Sin48°×F1+12×Sin48°×F2+23×Sin48°×F2+34×Sin48°×F3+45×Sin48°×F4+56×Sin48°×F4=Ggeneral assembly×L/2=118.62×59.5/2
Combining the above formulas to obtain: f1=30.2t；F2=15.1t；F3=49.6t；F4=24.8t
Then, the maximum stress of a single steel wire rope of the auxiliary crane is as follows: FS3= F3/4=12.4 t; FS4= F4/4=6.2t
In the same way, the stress of all the hoisting rigging such as the steel wire rope, the pulley and the like can be obtained according to the static balance principle. Referring to fig. 4, the type of the hoist in this example is as follows according to the stress condition of the hoist:
table 1 sling model selection table in this embodiment
And S54, combining the weight of the reinforcement cage and the load of the crane, and considering the worst working condition to carry out recheck and check calculation of the bearing capacity of the foundation, if not, taking corresponding measures.
In the embodiment, the total hoisting weight is 118.62t, the self-weight load of the main crane is about 410t, the total maximum ground load is F total =528.62t, in order to ensure the uniform diffusion of the load, a thick steel plate or a road base plate of 12 × 2.5m is arranged below the track of the crane, and in the worst case, all the load is transmitted to the construction road surface through the steel plate or the road base plate below a single track.
The road structure is shown in figure 7 and comprises reinforced concrete with the thickness of 35cm, a water-stable layer with the thickness of 25cm and a broken stone cushion layer with the thickness of 50cm from top to bottom respectively.
The maximum load borne by the road surface is Pmax = FGeneral assemblyand/S =528.62/(12 × 2.5) =176kPa, which is much smaller than the compressive strength of concrete, and whether the bearing capacity of the roadbed meets the requirement is calculated only after the load is diffused to the roadbed.
The spread angle of the load in the concrete was 45 deg., the spread angle in the water-stable layer and the gravel layer was 25 deg., see fig. 8. The width of the load spread is then: a =35 tan45 ° + (25+50) tan25 ° =70cm =0.7m, the stressed area of the roadbed is as follows: s' = (12+2a) ((2.5 +2a) = (12+0.7 × 2) ((2.5 +0.7 × 2) =52.26m2
Therefore, the load borne by the roadbed is as follows: p = Pmax S/S' =176 (12 × 2.5)/52.26=101kPa, and according to the survey report, the foundation bearing capacity is fa =120kPa > P =101kPa, which meets the requirement.
In the step S5, the calculation for hoisting the reinforcement cage can meet the requirements, and the calculation can be used for actual construction; and if the checking calculation cannot pass in other examples, the hoisting model selection calculation is carried out again until all the checking calculations meet the requirements.
Step S6 specifically includes:
and S61, exporting the NWC file from the BIM in the Revit software, importing the NWC file into NavisWorks software for construction simulation, forming construction simulation animations in the processes of crane station, lifting, walking, lowering and the like of reinforcement cage hoisting construction, and performing visual intersection of reinforcement cage hoisting for constructors.
Step S7 specifically includes:
and S71, after the manufacturing and hoisting operation of the first reinforcement cage is completed, summarizing experience, perfecting the BIM model and the construction method, and guiding the subsequent manufacturing and hoisting of the reinforcement cage.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A construction method for manufacturing and hoisting a reinforcement cage of an underground continuous wall is characterized by comprising the following steps:
s1, establishing a three-dimensional field floor plan in Revit software to form a project BIM model;
s2, creating a steel reinforcement cage in the project BIM model to manufacture a tire membrane frame for guiding field construction and acceptance inspection;
s3, gradually establishing a three-dimensional model of the reinforcement cage in Revit software, and performing visualized intersection and reinforcement cage acceptance by using the model;
s4, calculating the weight G of the reinforcement cage by using Revit software;
s5, carrying out lifting calculation on the reinforcement cage according to the size, the weight and the like of the reinforcement cage;
the method specifically comprises the following steps:
s51, according to the weight G of the reinforcement cage obtained in the step S4 and the weight G' of the additional load of the lifting hook and the lifting rigging, the total weight G of the lifting is hoistedGeneral assembly= G + G'; the type selection of the hoisting machinery is always carried out according to the total hoisting weight G, the most unfavorable working condition of a main crane in the hoisting operation of the steel reinforcement cage is that the main crane walks in a load mode after the steel reinforcement cage is vertical, and the hoisting safety factor of the main crane is KMaster and slaveThen, the main crane is required to have the type-selecting hoisting capacity [ FMaster and slave]Reach the calculation hoisting capacity F of the main craneMaster and slaveI.e. satisfy [ FMaster and slave]＞FMaster and slaveIn which F isMaster and slave=GGeneral assembly/KMaster and slave；
The bearing load of the auxiliary crane is 70 percent G under the worst working conditionGeneral assemblyThe lifting safety coefficient of the auxiliary crane is KAuxiliary setThen, the auxiliary crane is required to select the type lifting capacity [ FAuxiliary set]To achieve the calculation hoisting of the auxiliary craneCapability KAuxiliary setI.e. satisfy [ FAuxiliary set]＞FAuxiliary setIn which F isAuxiliary set=70%GGeneral assembly/KAuxiliary set；
The maximum allowable lifting height [ H ] of the main crane reaches the calculated lifting height H, namely the condition that [ H ] is more than H is met;
the method comprises the following steps that the lifting height H = b + H1+ H2+ H3+ H4+ H5 is calculated for a steel reinforcement cage, wherein b is the distance between the center of a lifting hook and an arm end, H1 is the height of a steel wire rope above a carrying pole, H2 is the height of the carrying pole, H3 is the height of a steel wire rope below the carrying pole, H4 is the length of the steel reinforcement cage, H5 is the height of the steel reinforcement cage from the ground, and then the maximum allowable lifting height [ H ] > H is selected by inquiring a description of a crawler crane so as to meet requirements;
s52, determining the position of a lifting point according to the length of the reinforcement cage, wherein the determination of the position of the lifting point is a key step in the lifting process, and the position is determined according to a bending moment balance law, namely-M = + M, wherein + M is the positive bending moment value of the reinforcement cage; -M-value of the hogging moment of the reinforcement cage; because the bending moment deformation of the reinforcement cage of the underground continuous wall is the minimum when the positive and negative bending moments are equal, the distance between the hoisting points is the most reasonable when the position of the hoisting point of the reinforcement cage is determined according to the principle that the positive and negative bending moments are equal;
s53, calculating the stress condition of the sling according to the weight G of the steel reinforcement cage, the arrangement of lifting points and the static balance principle, and selecting the type of the sling;
for the main crane, the most unfavorable state of the stress of the hoisting rigging is that the weight of the steel reinforcement cage is borne by the main crane alone after the steel reinforcement cage is vertical, n steel wire ropes are arranged under the carrying pole for load distribution, so that the stress of a single steel wire rope under the carrying pole of the main crane is Fs1=GGeneral assembly/2n, wherein GGeneral assemblyHoisting the total weight; n is the number of steel wire ropes under the carrying pole;
for an auxiliary crane, when the reinforcing cage is horizontally hoisted by a double crane, the stress of a hoisting rigging is the most unfavorable state, and according to static balance conditions, the following steps are obtained: gGeneral assembly=FCombination of Chinese herbs，GGeneral assemblyHoisting the total weight; fCombination of Chinese herbs-a calculated vertical resultant force;
taking a moment from one end of the reinforcement cage, and balancing according to the bending moment to obtain: the calculated resultant bending moment Ma = 0;
the maximum stress F of a single steel wire rope of the auxiliary crane can be obtained through calculationS3；
All the hoisting rigging stresses such as steel wire ropes, pulleys and the like can be obtained according to the static balance principle;
s54, combining the weight of the reinforcement cage and the load of the crane, and considering the most unfavorable working condition to carry out the rechecking and checking calculation of the bearing capacity of the foundation, if not, taking corresponding measures;
s6, carrying out dynamic simulation and visual bottom crossing on the hoisting process of the reinforcement cage;
and S7, summarizing and optimizing the construction process after the construction is finished.
2. The underground continuous wall reinforcement cage manufacturing and hoisting construction method according to claim 1, characterized in that: the step S1 specifically includes:
s11, before modeling, establishing a project-level BIM template model, unifying elevation and coordinate positioning, and unifying component naming rules and management standards;
s12, when modeling, importing the electronic drawing in the AutoCAD into Revit software through a connection command, and ensuring that base points are overlapped; and generating a three-dimensional model for each partition and component in the floor plan by creating a family command, and giving corresponding sizes and materials to the three-dimensional model to form a project BIM model.
3. The underground continuous wall reinforcement cage manufacturing and hoisting construction method according to claim 1, characterized in that: the step S2 specifically includes:
s21, building a steel reinforcement cage manufacturing and stacking area in the BIM, creating a steel reinforcement cage manufacturing and tire film frame model according to the size and the shape of the steel reinforcement cage of the underground diaphragm wall, and extracting the position and elevation information of the tire film frame model for on-site construction measurement and positioning;
and S22, after the construction of the on-site steel reinforcement cage tire membrane frame is completed, checking and accepting by using a tire membrane frame BIM model.
4. The underground continuous wall reinforcement cage manufacturing and hoisting construction method according to claim 1, characterized in that: the step S3 specifically includes:
s31, generating steel bars by adopting a group creating command in Revit software, generating single steel bars by a lofting command according to a reinforcement cage reinforcement map, and arranging the steel bars by adopting commands such as arrays and the like according to the spacing of the steel bars to form a three-dimensional model of the reinforcement cage;
s32, leading a BIM model of the reinforcement cage in Revit software into Navisvarks software, checking whether conflicts exist in the arrangement of each component in the reinforcement cage by using collision and error checking functions of the Navisvarks software, and optimizing again if conflicts exist;
and S33, performing visual bottom crossing by using the optimized BIM model of the reinforcement cage to guide construction, and performing on-site inspection and acceptance by using the BIM model of the reinforcement cage after the reinforcement cage is processed.
5. The underground continuous wall reinforcement cage manufacturing and hoisting construction method according to claim 4, characterized in that: the step S4 specifically includes automatically counting volume information of each component according to the reinforcement cage three-dimensional model created in the step S31 through a detailed table in Revit software, extracting the reinforcement volume V of the reinforcement cage of the underground continuous wall by a keyword filtering function, and multiplying the reinforcement volume V by the steel density ρ to obtain the weight G of the reinforcement cage, that is, G = ρ V, where the weight G of the reinforcement cage is used as a basis for material entry and reinforcement cage hoisting calculation.
6. The underground continuous wall reinforcement cage manufacturing and hoisting construction method according to claim 1, characterized in that: the step S6 specifically includes: the BIM model in the Revit software is exported to an NWC file, the NWC file is imported to NavisWorks software for construction simulation, construction simulation animations of processes of crane station position, lifting, walking, lowering and the like in steel reinforcement cage lifting construction are formed, and visual bottom crossing of steel reinforcement cage lifting is carried out on constructors.
7. The underground continuous wall reinforcement cage manufacturing and hoisting construction method according to any one of claims 1 to 6, characterized in that: and the step S7 specifically comprises the steps of summarizing experience after the manufacturing and hoisting operation of the first reinforcement cage is completed, perfecting a BIM model and a construction method, and guiding the subsequent manufacturing and hoisting of the reinforcement cage.
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