CN112065043B - Large cantilever safe intelligent construction system and method for finite element synchronous analysis - Google Patents
Large cantilever safe intelligent construction system and method for finite element synchronous analysis Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
- E04G13/066—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall for overhangs
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Abstract
The invention discloses a large cantilever safe intelligent construction system and a method for finite element synchronous analysis, which comprises a built structure, a cantilever structure template, an intelligent control inhaul cable, a temporary cable-stayed system and a finite element model; the cantilever structure template is arranged on the built structure, a plurality of template side stay cable through holes and concrete pouring and vibrating holes are arranged on the cantilever structure template, and displacement measuring points are arranged on the bottom surface of the cantilever structure template; one end of the intelligent control inhaul cable is connected with the temporary diagonal system, and the other end of the intelligent control inhaul cable is connected with a plurality of template side inhaul cable through holes arranged on the cantilever structure template; the temporary cable-stayed system comprises a cable-stayed system pressure bar base, a cable-stayed system pressure bar, a cable-stayed system stay and a cable-stayed system stay base. The invention can realize that the tension of the inhaul cable is obtained by establishing a finite element model through a computer, and the tension of the inhaul cable is automatically adjusted according to the preset conditions and the key deformation of the load and the template, thereby further improving the safety and the construction progress of construction.
Description
Technical Field
The invention relates to the technical field of civil engineering construction, in particular to a large cantilever safe intelligent construction system and method for finite element synchronous analysis.
Background
In high-rise building, the top has the circumstances such as disjunctor structure or some special molding, can have the structure of encorbelmenting of longspan, and in the work progress of this type of structure of encorbelmenting, if adopt conventional technical means to set up full hall to support not enough reality, and the scaffold frame of encorbelmenting also has some safety problems sometimes, and the material resources manpower of expense is also great.
The template of the existing cantilever structure is used temporarily, and can be detached as long as pouring is completed, so that a temporary stay cable system can be adopted, the vertical load of the template in construction is converted into the pulling force of a stay cable and the axial force of the template, but not the bending moment of the template, and the pulling force of the stay cable is transmitted to the cable-stayed lock body system. However, due to the problem of processing precision in the construction process of a conventional stay cable system, a system established by a plurality of stay cables is an indeterminate system, the stress of some stay cables in the system is not stressed according to a preset mode, the stress balance of the integral template system is possibly not greatly influenced by the non-uniformly stressed stay cable modes, but a local template system is unbalanced, so that the local size is not accurate, and in extreme cases, each breaking phenomenon of the integral template system can be caused, which is also the reason that the zipper system is not too useful in the construction of a large-span cantilever structure; in a specific construction process, a concrete pouring process is a gradual process, and in many cases, the concrete is poured in sections, so that the stress is gradual, and the early pre-tightening of the stay ropes can cause the template system to be deformed excessively and the construction precision of the component to be difficult to control. Therefore, the best method is to pull the guy cable gradually according to the load in the pouring process, feed back the actual stress and deformation of the guy cable, eliminate the situation of excessive filling of the guy cable, monitor the vertical displacement and the torsional displacement of the template system at any time, and automatically control the vertical displacement and the torsional displacement by the computer all weather so as to achieve the required construction safety and construction precision. In view of the above, no specific technique is currently available to accomplish the above construction process.
Patent publication No. CN204059903U discloses a construction cushion cap of building is encorbelmented to large tracts of land, including encorbelmenting support and bearing plate, the support of encorbelmenting is from interior and tilt up outward, and the support of encorbelmenting is the echelonment and distributes, the medial extremity of the support of encorbelmenting has vertical fixed foot and transverse fixing foot, and vertical fixed foot is fixed in on the structure roof beam, on transverse fixing foot was fixed in the floor board, the bearing plate frame was located on the support of encorbelmenting of adjacent two. The cantilever support is erected by relying on a floor panel of a main body of a building, one end of the cantilever support is fixed on the floor panel, the shelf plates are sequentially arranged on the cantilever supports distributed in a ladder shape, the shelf plates are only required to be laid upwards step by step when placed, and the shelf plates are also required to be detached downwards step by step from outside to inside when detached.
Disclosure of Invention
The invention aims to provide a large cantilever safe and intelligent construction system and method for finite element synchronous analysis, which can realize that a finite element model is established by a computer to obtain the tension of a stay cable, the vertical deformation and the torsional deformation of the whole cantilever structure template are monitored according to preset conditions, the tension of the stay cable is automatically adjusted all the time, and the synchronous analysis is achieved, so that the construction safety and the construction progress are further improved, and the problems in the background technology are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
the large cantilever safe intelligent construction system for finite element synchronous analysis comprises a built structure, a cantilever structure template, an intelligent control inhaul cable, a temporary cable-stayed system and a finite element model; the cantilever structure template is arranged on the built structure, a plurality of template side stay cable through holes and concrete pouring and vibrating holes are arranged on the cantilever structure template, and displacement measuring points are arranged on the bottom surface of the cantilever structure template;
one end of the intelligent control inhaul cable is connected with the temporary cable-stayed system, and the other end of the intelligent control inhaul cable is connected with a plurality of template side inhaul cable through holes arranged on the cantilever structure template;
the temporary cable-stayed system comprises a cable-stayed system pressure bar base, a cable-stayed system pressure bar, a cable-stayed system stay cable and a cable-stayed system stay cable base; the pressure lever base of the cable-stayed system and the inhaul cable base of the cable-stayed system are pre-embedded on the built-up structure or connected with a pre-embedded part on the built-up structure; the pressure lever of the cable-stayed system is sleeved and fixed on a pressure lever base of the cable-stayed system, one end of a cable of the cable-stayed system is connected with the pressure lever of the cable-stayed system, and the other end of the cable-stayed system is connected with the cable base of the cable-stayed system;
and the finite element model is in communication connection with the intelligent control inhaul cable through one end of the computer, and the other end of the finite element model is in data communication connection with a displacement sensor arranged at a position opposite to the displacement measuring point.
Furthermore, the displacement measuring points are arranged in two rows, and displacement sensors are arranged corresponding to the displacement measuring points, and the displacement sensors adopt common laser or stay wire sensors on the market and are used for being installed on the built structure.
Furthermore, the intelligent control inhaul cable is a tension adjustable device calculated according to an equation, and the intelligent control inhaul cable is symmetrically arranged and is respectively pulled towards two sides in an inclined mode.
Furthermore, the intelligent control inhaul cable comprises a hydraulic cylinder, an inhaul cable and a hydraulic piston; one end of the inhaul cable is connected with a hydraulic piston, and the hydraulic piston is controlled by a hydraulic cylinder.
Further, the temporary cable-stayed systems are arranged in pairs relative to the cantilever structure template.
The invention provides another technical scheme: the construction method of the large cantilever safe intelligent construction system based on finite element synchronous analysis comprises the following steps:
the first step is as follows: before construction, firstly, acquiring the dimension parameters of a cantilever structure template, the flow of poured concrete and the actual structure parameters of diagonal system parameters;
the second step is that: according to the wind load of the site, the construction load obtains the comprehensive load of the cantilever structure template;
the third step: carrying out modeling analysis on a finite element model on a computer according to the data, and acquiring the stay cable tension at the moment corresponding to the data;
the fourth step: the construction is started, concrete is injected into the cantilever structure template from the concrete pouring and vibrating hole for vibrating, then the pulling force of the inhaul cable is input into the control equipment for intelligently regulating and controlling the inhaul cable, the pulling force of the inhaul cable is output through the hydraulic equipment, and the pulling force and inhaul cable deformation information are fed back;
the fifth step: the method comprises the steps that load change and pull force of a pull cable are changed due to concrete pouring, the load change and the pull force of the pull cable simultaneously act on an overhanging structure template, the overhanging structure template deforms, a plurality of displacement measuring points are arranged at the bottom end of the overhanging structure template, deformation of the overhanging structure template is measured constantly, and the vertical deformation mode and the torsional deformation condition of the overhanging structure template are known according to measuring results of multiple points;
and a sixth step: inputting the deformation condition and the pull force of the inhaul cable obtained in the fifth step into a displacement condition and a mechanical balance equation of the cantilever structure template at the same time, and judging whether the displacement condition and the mechanical balance equation meet requirements or not; if the requirement is met, the tension of the inhaul cable can be kept unchanged; if the requirements are not met, adjusting relevant parameters according to a mechanical balance equation and the force and displacement conditions, returning to the step two again, carrying out modeling analysis on the finite element model, inputting the iterated new guy cable tension into guy cable force output equipment, repeating the processes of the step three-the step six, circulating, exiting after the requirements are met all the time, and keeping the guy cable tension;
the seventh step: and (5) continuing construction, and then entering the step one, and sequentially circulating until the pouring is finished.
Compared with the prior art, the invention has the beneficial effects that:
the large cantilever safe intelligent construction system and method for finite element synchronous analysis provided by the invention can realize that a finite element model is established by a computer to obtain the tension of the stay cable, the vertical deformation and the torsional deformation of the whole cantilever structure template are monitored according to the preset conditions, the tension of the stay cable is automatically adjusted all the time, and the synchronous analysis is achieved, thereby further improving the construction safety and the construction progress.
Drawings
FIG. 1 is an isometric view of the system of the present invention;
FIG. 2 is a side elevational view of the system of the present invention;
FIG. 3 is a plan view of the system of the present invention;
FIG. 4 is an isometric view of the invention without the built structure;
FIG. 5 is a plan view of the invention without the built structure;
FIG. 6 is a side view of the invention without the built structure;
FIG. 7 is a front view of the present invention without the built structure;
FIG. 8 is an isometric view of an overhanging structure template of the present invention;
FIG. 9 is an elevational view of an overhanging structure template of the present invention;
FIG. 10 is a plan view of an overhanging structure template of the present invention;
FIG. 11 is a view showing the arrangement of displacement measuring points at the top end of the cantilever structure template according to the present invention;
FIG. 12 is a schematic isometric view of a tension cable stress control device of the present invention;
FIG. 13 is a schematic cross-sectional view of a tension cable stress control device of the present invention;
FIG. 14 is an isometric view of a temporary cable-stayed system according to the present invention;
FIG. 15 is a side elevation view of a temporary cable-stayed system according to the present invention;
FIG. 16 is a cross-sectional view of a temporary cable-stayed system according to the present invention;
FIG. 17 is a diagram of a pressure bar embedded part of the temporary cable-stayed system according to the present invention;
FIG. 18 is a flow chart of the construction method of the present invention.
In the figure: 1. the structure is built; 2. a cantilever structure template; 201. perforating a pull rope at the side edge of the template; 202. pouring concrete and vibrating holes; 203. displacement measuring points; 3. intelligently regulating and controlling a stay cable; 301. a hydraulic cylinder; 302. a cable; 303. a hydraulic piston; 4. a temporary cable-stayed system; 401. a compression bar base of the cable-stayed system; 402. a diagonal tension system compression bar; 403. a cable of the cable-stayed system; 404. a stay cable base of the cable-stayed system; 5. and (4) finite element modeling.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1-17, in the embodiment of the present invention: the large cantilever safe intelligent construction system for finite element synchronous analysis comprises a built structure 1, a cantilever structure template 2, an intelligent control inhaul cable 3, a temporary cable-stayed system 4 and a finite element model 5; the cantilever structure template 2 is arranged on the built structure 1, a plurality of template side stay cable through holes 201 and concrete pouring and vibrating holes 202 are arranged on the cantilever structure template 2, and displacement measuring points 203 are arranged on the bottom surface of the cantilever structure template 2; one end of an intelligent control inhaul cable 3 is connected with the temporary cable-stayed system 4, and the other end of the intelligent control inhaul cable is connected with a plurality of template side inhaul cable through holes 201 arranged on the cantilever structure template 2; the temporary cable-stayed system 4 is arranged in pairs relative to the cantilever structure template 2, and the temporary cable-stayed system 4 comprises a cable-stayed system pressure bar base 401, a cable-stayed system pressure bar 402, a cable-stayed system cable 403 and a cable-stayed system cable base 404; the pressure rod base 401 of the diagonal system and the stay cable base 404 of the diagonal system are pre-embedded on the built-up structure 1 or connected with a pre-embedded part on the built-up structure 1; the diagonal system compression bar 402 is fixedly sleeved on a diagonal system compression bar base 401, one end of a diagonal system cable 403 is connected with the diagonal system compression bar 402, and the other end of the diagonal system cable is connected with a diagonal system cable base 404; and one end of the finite element model 5 is in communication connection with the intelligent control inhaul cable 3 through a computer, and the other end of the finite element model is in data communication connection with a displacement sensor arranged at a position opposite to the displacement measuring point 203.
In the above embodiment, the displacement measuring points 203 are arranged in two rows, and displacement sensors are provided corresponding to the displacement measuring points 203, the displacement sensors are laser or pull line sensors on the common market, and are used for being installed on the built structure 1, and the vertical deformation and the torsional deformation of the template system can be calculated through the test data of the displacement measuring points 203.
In the above embodiment, the intelligent control cable 3 is a tension-adjustable device calculated according to an equation, and the intelligent control cable 3 is symmetrically arranged and is respectively inclined to both sides; the intelligent control inhaul cable 3 can adopt equipment such as a hydraulic transmission device, servo motor rotating bolt transmission equipment, an electric turnbuckle transmission device and the like, is conventional equipment, the embodiment adopts the hydraulic transmission equipment for introduction, and the intelligent control inhaul cable 3 comprises a hydraulic cylinder 301, an inhaul cable 302 and a hydraulic piston 303; one end of the stay cable 302 is connected with a hydraulic piston 303, the hydraulic piston 303 is controlled by a hydraulic cylinder 301, the hydraulic piston 303 moves in the hydraulic cylinder 301 under the action of a hydraulic control system to apply force and displacement to the stay cable 302, and in the operation process, the device can measure force and displacement of the stay cable 302.
The principle is as follows: establishing a complex and accurate kinetic equation by using the complex load, boundary conditions and the structure self condition by using the finite element model 5:
wind load, self-weight load and the like can be reflected in a load vector { F } according to the concrete flow and wind speed conditions.
The density, elastic modulus, size, rigidity, damping and other parameters of the system structure can be embodied in [ M ], [ C ] and [ K ], the whole process control of the intelligent system can be realized through the equation, but the precision of [ M ], [ C ] and [ K ] established by the model can be further improved due to factors such as size error, material performance error, nonlinearity and the like.
First, generating M after modeling by a finite element model 50]、[C0]、[K0]Matrix, in which [ K ] is adjusted]The matrix is most important because the load is mainly static load during construction, [ M ]]、[C]The difference caused by matrix change is small; calculating the theoretical deformation of the structure under the first step of loading
First step of structural deformation under actual load
According to the equivalent linearization principle, the elastic model of the material is adjusted, so that the difference between the theoretically calculated deformation and the actual deformation is smaller than the set tolerance, and a new rigidity matrix [ K ] is obtained1]Subsequent work is carried out, and the stiffness matrix [ K ] of the nth step is synchronously modifiedn](ii) a In this case, engineering errors can be controlled significantly.
Referring to fig. 18, the construction method of the intelligent large cantilever safe construction system based on finite element synchronous analysis includes the following steps:
the first step is as follows: before construction, firstly, obtaining the size parameters of the cantilever structure template 2, the flow of poured concrete and the actual structural parameters of the diagonal system parameters;
the second step is that: according to the wind load on site, the construction load can obtain the comprehensive load of the cantilever structure template 2;
the third step: carrying out modeling analysis on the finite element model 5 on a computer according to the data, and acquiring the pulling force of the stay cable 302 at the moment corresponding to the data;
the fourth step: the construction is started, concrete is injected into the overhanging structure template 2 from the concrete pouring and vibrating hole 202 for vibrating, then the pulling force of the stay cable 302 is input into the control equipment for intelligently regulating and controlling the stay cable 3, the pulling force of the stay cable 302 is output through hydraulic equipment, and the pulling force and the deformation information of the stay cable 302 are fed back;
the fifth step: due to the fact that concrete pouring causes load change and tension of the inhaul cable 302 change, the load change and the tension simultaneously act on the cantilever structure template 2, the cantilever structure template 2 deforms, the plurality of displacement measuring points 203 arranged at the bottom end of the cantilever structure template 2 measure deformation of the cantilever structure template 2 constantly, and the vertical deformation mode and the torsional deformation condition of the cantilever structure template 2 can be known according to the measuring results of multiple points;
and a sixth step: inputting the deformation condition and the tension of the inhaul cable 302 obtained in the fifth step into the displacement condition and the mechanical balance equation of the cantilever structure template 2 at the same time, and judging whether the displacement condition and the mechanical balance equation meet the requirements or not; if the requirement is met, the tension of the stay cable 302 can be kept unchanged; if the requirements are not met, adjusting relevant parameters according to a mechanical balance equation and the force and displacement conditions, returning to the step two again, carrying out modeling analysis on the finite element model 5, inputting the new guy cable 302 tension obtained through iteration into guy cable force output equipment, repeating the processes of the step three-the step six, circulating, exiting after the requirements are met all the time, and keeping the guy cable 302 tension;
the seventh step: and (5) continuing construction, and then entering the step one, and sequentially circulating until the pouring is finished.
In the above embodiment, due to the measurement error and other uncontrollable factors, the data analyzed by the finite element model 5 may have deviation with the actual construction process, and the deviation is larger or smaller, but the slight deviation may cause construction accidents during the construction process, so the data must be repeatedly measured and analyzed, and the simulation result and the actual result are compared, and then the finite element model 5 of the structure is reversely adjusted.
From the above, it can be seen that: in the first embodiment, the finite element model 5 can be established through the computer to obtain the tension of the stay cable 302, the vertical deformation and the torsional deformation of the whole cantilever structure template 2 are monitored according to the preset conditions, the tension of the stay cable 302 is automatically adjusted all the time, and synchronous analysis is achieved, so that the construction safety and the construction progress are further improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (6)
1. The large cantilever safe intelligent construction system for finite element synchronous analysis is characterized by comprising a built structure (1), a cantilever structure template (2), an intelligent control inhaul cable (3), a temporary cable-stayed system (4) and a finite element model (5); the cantilever structure formwork (2) is arranged on the built structure (1), a plurality of formwork side cable through holes (201) and concrete pouring and vibrating holes (202) are formed in the cantilever structure formwork (2), and displacement measuring points (203) are arranged on the bottom surface of the cantilever structure formwork (2);
one end of the intelligent control inhaul cable (3) is connected with the temporary diagonal system (4), and the other end of the intelligent control inhaul cable is connected with a plurality of template side inhaul cable through holes (201) formed in the cantilever structure template (2);
the temporary cable-stayed system (4) comprises a cable-stayed system pressure bar base (401), a cable-stayed system pressure bar (402), a cable-stayed system stay (403) and a cable-stayed system stay base (404); the pressure bar base (401) of the cable-stayed system and the cable base (404) of the cable-stayed system are pre-buried on the built structure (1) or connected with a pre-buried part on the built structure (1); the system comprises a diagonal system compression bar (402), a diagonal system compression bar base (401), a diagonal system inhaul cable (403), a diagonal system inhaul cable base (404), a diagonal system inhaul cable base (402), a diagonal system inhaul cable base (403) and a diagonal system inhaul cable base (402), wherein the diagonal system inhaul cable base (402) is fixedly sleeved on the diagonal system compression bar base;
the finite element model (5) is in communication connection with the intelligent control inhaul cable (3) through one end of a computer, and the other end of the finite element model is in data communication connection with a displacement sensor arranged at a position opposite to the displacement measuring point (203).
2. The finite element synchronous analysis intelligent construction system for large cantilever according to claim 1, wherein: the displacement measuring points (203) are arranged in two rows, displacement sensors are arranged corresponding to the displacement measuring points (203), and the displacement sensors adopt laser or stay wire sensors on the common market and are used for being installed on the built structure (1).
3. The finite element synchronous analysis intelligent construction system for large cantilever according to claim 1, wherein: the intelligent control inhaul cable (3) is a pulling force adjustable device calculated according to an equation, and the intelligent control inhaul cable (3) is symmetrically arranged and is respectively pulled towards two sides in an inclined mode.
4. The finite element synchronous analysis intelligent construction system for large cantilever according to claim 1, wherein: the intelligent control inhaul cable (3) comprises a hydraulic cylinder (301), an inhaul cable (302) and a hydraulic piston (303); one end of the inhaul cable (302) is connected with a hydraulic piston (303), and the hydraulic piston (303) is controlled by a hydraulic cylinder (301).
5. The finite element synchronous analysis intelligent construction system for large cantilever according to claim 1, wherein: the temporary cable-stayed systems (4) are arranged in pairs relative to the cantilever structure template (2).
6. The construction method of the intelligent construction system for large cantilever safety of finite element synchronous analysis according to claim 1, comprising the steps of:
the first step is as follows: before construction, firstly, obtaining the size parameters of the cantilever structure template (2), the flow of poured concrete and the actual structure parameters of diagonal system parameters;
the second step is that: according to the wind load on site, the construction load obtains the comprehensive load of the cantilever structure template (2);
the third step: carrying out modeling analysis on a finite element model (5) on a computer according to the data, and acquiring the tension of the inhaul cable (302) at the moment corresponding to the data;
the fourth step: the construction is started, concrete is injected into the cantilever structure template (2) from the concrete pouring and vibrating hole (202) and is vibrated, the pulling force of the inhaul cable (302) is input into a control device for intelligently regulating and controlling the inhaul cable (3), the pulling force of the inhaul cable (302) is output through a hydraulic device, and the pulling force and the deformation information of the inhaul cable (302) are fed back;
the fifth step: load change and tension of the stay cable (302) are changed due to concrete pouring, the load change and the tension simultaneously act on the cantilever structure template (2), the cantilever structure template (2) deforms, a plurality of displacement measuring points (203) are arranged at the bottom end of the cantilever structure template (2), deformation of the cantilever structure template (2) is measured at any time, and the vertical deformation mode and the torsional deformation condition of the cantilever structure template (2) are known according to the measuring results of multiple points;
and a sixth step: inputting the deformation condition and the tension of the stay cable (302) obtained in the fifth step into the displacement condition and the mechanical balance equation of the cantilever structure template (2) at the same time, and judging whether the displacement condition and the mechanical balance equation meet the requirements or not; if the requirement is met, the tension of the inhaul cable (302) can be kept unchanged; if the requirements are not met, adjusting relevant parameters according to a mechanical balance equation and the force and displacement conditions, returning to the step two again, carrying out modeling analysis on the finite element model (5), inputting the tension of the iterated new inhaul cable (302) into inhaul cable force output equipment, repeating the processes of the step three to the step six, circulating, exiting after the requirements are met all the time, and keeping the tension of the inhaul cable (302);
the seventh step: and (5) continuing construction, and then entering the step one, and sequentially circulating until the pouring is finished.
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