CN117113518A - 9-direction converging space net shell cast steel node accurate installation construction method and cast steel node - Google Patents
9-direction converging space net shell cast steel node accurate installation construction method and cast steel node Download PDFInfo
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Abstract
The invention discloses a 9-direction converging space reticulated shell cast steel node accurate installation construction method and a cast steel node. The accurate installation construction method comprises the following steps: s10, designing and manufacturing a 9-direction converging space latticed shell cast steel node; s20, performing overall process simulation control of the installation accuracy by using a simulation model; s30, performing primary precision control on the installation sequence by adopting a latticed shell ring-by-ring sectional assembly molding technology; s40, adopting machining to process the butt joint interface, and controlling the secondary precision of the butt joint interface of the steel casting and the rod piece; s50, performing auxiliary installation and positioning by installing multiple machines on site, and performing three-level precision control on the installation position; s60, performing rod piece butt joint control, and performing four-stage precision control on butt joint connection of the steel castings and the rod pieces; and S70, measuring and controlling, and performing reticulated shell rechecking five-level precision control. The invention solves the problem that the stress of the complex node in all directions cannot meet at one point, ensures the installation precision, has reasonable stress and convenient and safe construction, and can practically solve the engineering technical problem.
Description
Technical Field
The invention relates to the technical field of building engineering construction, in particular to a 9-direction intersection space reticulated shell cast steel node accurate installation construction method and a cast steel node.
Background
Node design is the key of success and failure of a relational space reticulated shell structure system, and the design and use of some novel nodes in the current research are not much.
For some novel space reticulated shell structures, the nodes are complex, and sometimes 9 or even more than 9 rod members are stressed and converged at one point, so that the prior art does not have a good method for solving the structure processing and the field installation precision control when the rod members are converged. The existing multi-direction intersecting node is processed, the space intersecting node is generally difficult to manufacture according to plane lofting positioning, and meanwhile, on-site installation is difficult to realize on-site accurate positioning due to component processing errors, transportation errors, welding errors, installation positioning errors and the like.
In addition, the installation accuracy control of the space reticulated shell node is generally related to the installation mode and the use of the measuring instrument. The existing installation modes mainly comprise integral lifting, integral hoisting, a sliding method, high-altitude bulk loading, segmented and segmented installation and the like, the measuring instrument mainly comprises a total station, a theodolite and the like, and the installation such as high-altitude bulk loading and total station collocation and the like is mainly controlled by adopting a single method. However, the error is formed in each link of the installation process, and the existing installation mode still has difficulty in accurately controlling the precision. The existing single direction control technology cannot realize overall omnibearing control, such as installation accumulated errors and welding deformation errors caused by high-altitude bulk and total station collocation, so that the errors are difficult to eliminate; meanwhile, when the folding in different directions is performed, the error occurs due to the precision problem, and the folding is not superior.
Therefore, new node and precision control techniques need to be studied to meet the engineering construction precision control requirements.
Disclosure of Invention
Aiming at the defects of the prior art, the invention designs and manufactures a novel 9-direction spatial reticulated shell cast steel node which is intersected at one point in the center, and performs accurate installation control, so that the number of cast steel node interfaces is large, the problem that stress in all directions of a complex node cannot be intersected at one point is solved, the installation precision is ensured, the stress is reasonable, the construction is convenient and safe, the obvious effect is achieved, and the engineering technical problem can be really solved.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the invention provides a 9-direction converging space net shell cast steel node accurate installation construction method, wherein the 9-direction converging space net shell cast steel node consists of 9-direction cast steel pieces and 9-direction rod pieces, 8 of the 9-direction rod pieces are converged in the center of the 9-direction cast steel pieces in the same plane, and 1 of the 9-direction rod pieces are converged in the center at the lower part of the center of the 9-direction cast steel pieces; the accurate installation construction method comprises the following steps: s10, designing a simulation model through BIM, performing design analysis and simulation calculation by the simulation model, customizing the blanking processing of the die, precisely positioning by BIM, and processing and manufacturing the 9-direction intersection space net shell cast steel node; s20, combining BIM technology with steel structure construction, and performing overall process simulation control of installation accuracy by using a simulation model; s30, reasonably adjusting the installation sequence by adopting a latticed shell ring-by-ring sectional assembly molding technology, and performing primary precision control on the installation sequence; s40, after ring-by-ring sectional assembly is completed, machining is adopted to process the butt joint interface, and secondary precision control of the butt joint interface of the steel casting and the rod piece is carried out; s50, performing auxiliary installation and positioning by installing multiple machines on site, and performing three-level precision control on the installation position; s60, performing rod piece butt joint control, and performing four-stage precision control on butt joint connection of the steel castings and the rod pieces; and S70, measuring and controlling, and performing reticulated shell rechecking five-level precision control.
In some embodiments, the whole process simulation control of the installation accuracy by using a simulation model is performed by combining BIM technology with steel structure construction, and the method comprises the following steps:
s201, extracting elevation, axis and coordinate information of each component in the BIM in the early stage of installation and implementation of the latticed shell steel castings and the rod pieces;
s202, performing three-dimensional coordinate measurement and release by using a total station on site, and timely collecting installation errors generated by processing, transportation, installation alignment, temperature and instruments on site;
s203, feeding the collected installation errors back to the BIM model for fine adjustment, and processing and fine adjustment of the next batch of components or adjustment of joints of steel components which are installed immediately before and after each other, wherein the joints are eliminated section by section.
In some embodiments, the loop-by-loop segmented stitch molding technique using a reticulated shell comprises:
s301, firstly, reasonably segmenting a roof reticulated shell, and assembling single rods of the reticulated shell on the ground to form a small-scale assembling unit;
s302, adopting a fixed reference, namely using a ring of cast steel nodes and rod pieces as the reference of the whole assembly, and sequentially installing the cast steel nodes and the rod pieces on the other rings;
s303, assembling the rings one by one according to the sequence until the last ring, and then closing and butting the rings.
In some embodiments, specifically including:
the first step: installing a single-ring inner steel casting and a center positioning steel casting;
and a second step of: assembling the single rod piece of the net shell into a 10-1-10-8 small assembling unit on the ground;
and a third step of: sequentially installing 10-1, 10-2, … and 10-8 small splice units;
fourth step: and sequentially installing the rods around the 10-1, 10-2, … and 10-8 central steel castings in sequence to finish assembly.
In some embodiments, the employing a machining process docking interface comprises:
and (3) machining and stretching the pipe orifice of the steel casting in advance to enable the position of the joint of the steel casting to be in shrinkage smooth transition, sleeving the rod piece into the joint of the steel casting, and reserving a distance of not less than 2mm between the inner wall of the rod piece and the joint of the steel casting.
In some embodiments, the field-mounted multi-implement auxiliary mounting positioning includes:
when the 9-direction steel casting is installed on site, hanging strips and multi-direction chain blocks are installed, and the multi-direction chain blocks are hung on the hanging strips respectively to assist in lifting, positioning and adjusting, so that elevation and angle of the steel casting and related components are controlled.
In some embodiments, the lever interface control comprises:
s601, when the net shell rod pieces are in butt joint, 4 positioning plates distributed at equal intervals on the circumference are adopted for temporary fixation, and the positioning plates are welded with cast steel nodes and the rod pieces;
s602, after the rod piece and the steel casting are welded, the positioning plate is cut off, and the connecting part is polished to be smooth and subjected to paint repairing treatment.
In some embodiments, the measurement control includes: and simultaneously, a plurality of total stations are utilized to carry out three-dimensional coordinate measurement and release, and net shell precision control is carried out.
The invention further provides a 9-direction intersection space reticulated shell steel casting node which is constructed by the accurate installation construction method, the 9-direction intersection space reticulated shell steel casting node comprises 9-direction steel castings and 9-direction rod pieces, 8 of the 9-direction rod pieces meet the center of the 9-direction steel castings in the same plane, and 1 of the 9-direction rod pieces meet the center at the lower part of the center of the 9-direction steel castings.
In some embodiments, the 9-direction steel casting is made of G20Mn5N high-strength steel, the whole steel casting is cast and molded by a die, the wall thickness is transited from the center to the edge from the thickness to the thin, the thickness of the whole pipe diameter of the center is transited to the edge by 2-3cm, and the edge position is designed into a neck-shrinking form.
In some embodiments, a protruding square cover plate is arranged on the upper portion of the center of the 9-direction steel casting and is used as a welding plane to be connected with the upper structure, and a double-lug plate is arranged on the lower portion of the center of the 9-direction steel casting and is used for being connected with the lower rod piece.
The beneficial effects are that: the 9-direction converging space reticulated shell cast steel node accurate installation construction method and the cast steel node solve the problem that stress in all directions of a complex node cannot converge at one point, ensure reasonable stress, are convenient and safe to construct, and achieve remarkable effects. In particular, it has at least one or more of the following advantages:
(1) The space reticulated shell structure system cast steel node is innovatively designed, the BIM aided design is used for accurate positioning, the simulation calculation, design and analysis are performed, the blanking processing of the mould is customized, the 9-direction converging space reticulated shell cast steel node is designed and manufactured, the number of cast steel node interfaces is large, the problem that stress in all directions cannot meet one point is solved, the reasonable and accurate stress is ensured, and the construction is convenient and safe.
(2) In the prior art, the multidirectional stress points cannot be precisely collinear or co-located because of the processing technical problem, which is an industrial problem, and the invention can well solve the problem; in addition, the structure of the invention is mainly an axial force tension compression member, the rod members are stressed along the axial direction of the rod members, so that the collineation and the co-point of all the crossed rod members can be ensured, and the simple and clear stress can be ensured, namely the reasonable stress can be ensured; meanwhile, as the bidirectional connecting clamping plates are arranged, the rod pieces are connected through the pin shafts, and the rod pieces are only required to be forked into the connecting clamping plates and connected with the pin shafts, so that the overhead working time is shortened, and the construction is convenient and safe.
(3) The method innovates the installation precision control of the space net shell cast steel node, and performs the installation precision control by comprehensively adopting the comprehensive complete set technologies of BIM technology, net shell ring-by-ring sectional assembly forming technology, machining treatment butt joint interface, field installation multi-machine tool precision control, rod piece butt joint control, measurement control and the like, has obvious effect and has good reference and utilization value under the condition that 9 or more pipe orifices need to be butt jointed on the cast steel node through engineering practice inspection.
(4) The 9-direction converging space net shell cast steel node is made of G20Mn5N high-strength steel, the whole cast steel node is formed by casting and processing a die, the wall thickness is changed from thick to thin, the thickness of the whole pipe diameter of the center is changed to about 2 cm to 3cm along the edge, the edge position is designed to be in a neck-shrinking opening form, the central upper part of the cast steel is designed to be in a protruding square cover plate form, and the protruding square cover plate is used as a welding plane to be connected with structures such as an upper purlin bracket; the lower part of the center of the steel casting is designed into a connection mode with double lugs, so that the steel casting can be conveniently connected with rods such as a lower string dome supporting rod. The node has novel design form, convenient use, reasonable stress and high popularization and application value, and ensures that stress in all directions can meet at one point.
It should be understood that the implementation of any of the embodiments of the invention is not intended to simultaneously possess or achieve some or all of the above-described benefits.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, but rather by the claims.
FIG. 1 is a flow chart of a method for precisely installing and constructing a cast steel node according to an embodiment of the invention;
FIG. 2 is a schematic plan view of a cast steel node according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a cast steel node A-A according to an embodiment of the present invention;
FIG. 4 is a schematic view of a cast steel node in horizontal cross section according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a cast steel node construction completion status according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the overall installation sequence of cast steel nodes according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a single ring installation sequence of cast steel nodes according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a cast steel node single ring installation completion in accordance with an embodiment of the present invention;
FIG. 9 is a schematic view of the installation sequence of the rods around the center cast according to the embodiment of the present invention;
FIG. 10 is a diagram of a field multi-tool precision control embodiment of the present invention;
FIG. 11 is a schematic view of a rod butt joint control according to an embodiment of the present invention, wherein (a) is a schematic side view and (b) is a schematic cross-sectional view;
FIG. 12 is a view of a completed object of the present invention;
fig. 13 is a view of a field measurement accuracy control object according to an embodiment of the present invention, in which (a) is a top plane overall measurement view and (b) is a side elevation overall measurement view.
Like or corresponding reference characters indicate like or corresponding parts throughout the several views.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the embodiments and the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be understood that the terms "comprises/comprising," "consists of … …," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method as desired. Without further limitation, an element defined by the phrases "comprising/including … …," "consisting of … …," and the like, does not exclude the presence of other like elements in a product, apparatus, process, or method that includes the element.
It is further understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship based on that shown in the drawings, merely to facilitate describing the present invention and to simplify the description, and do not indicate or imply that the devices, components, or structures referred to must have a particular orientation, be configured or operated in a particular orientation, and are not to be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Aiming at the defects of the prior art, particularly for some novel space reticulated shell structures, the nodes are complex, and sometimes 9 or even more than 9 rods are stressed and converged at one point, the invention adopts the comprehensive technologies of BIM technology, reticulated shell ring-by-ring sectional assembly forming technology, machining processing docking interface, field multi-machine installation for precision control, rod docking control, measurement control and the like for installation precision control, achieves remarkable effect, and can practically solve the engineering technical problem.
In order to better understand the above technical solution, the following detailed description will refer to the accompanying drawings and specific embodiments.
Referring to a flow chart shown in fig. 1, the invention provides a method for accurately installing and constructing a 9-direction converging space net shell cast steel node, which comprises the following steps: s10, designing a simulation model through BIM, performing design analysis and simulation calculation by the simulation model, customizing the blanking processing of the die, precisely positioning by BIM, and processing and manufacturing the 9-direction intersection space net shell cast steel node; s20, combining BIM technology with steel structure construction, and performing overall process simulation control of installation accuracy by using a simulation model; s30, reasonably adjusting the installation sequence by adopting a latticed shell ring-by-ring sectional assembly molding technology, and performing primary precision control on the installation sequence; s40, after ring-by-ring sectional assembly is completed, machining is adopted to process the butt joint interface, and secondary precision control of the butt joint interface of the steel casting and the rod piece is carried out; s50, performing auxiliary installation and positioning by installing multiple machines on site, and performing three-level precision control on the installation position; s60, performing rod piece butt joint control, and performing four-stage precision control on butt joint connection of the steel castings and the rod pieces; and S70, measuring and controlling, and performing reticulated shell rechecking five-level precision control.
As shown in fig. 2 to 5, first, a 9-direction converging space net shell steel casting node of the present invention is shown, and is formed by a steel casting 9 and peripheral rods, where the steel casting 9 is a 9-direction steel casting with symmetrical structure, and has a center O, and 8 rod interfaces radiating outwards from the center O, respectively denoted as 1# to 8# rod interfaces, the peripheral rods are corresponding 9-direction rods, 8 of the 9-direction rods are coplanar, respectively denoted as 1# to 8# rods, and 1# to 8# rods converge at the center O of the steel casting 9, and 1-direction rod of the 9-direction rods, namely, the 9# rod, converges at the center O at the lower part of the steel casting 9, preferably is vertical, that is, the 9# rod is in an orthogonal relationship with the plane where the 1# to 8# rod is located. Of course, the example of the 9# rod converging at the center O in the lower portion of the steel casting 9 is described herein, and it should be understood that this is a relative positional relationship, and the 9# rod may also converge at the center O in the upper portion of the steel casting 9.
In the invention, the 9-direction steel casting is made of G20Mn5N high-strength steel, the G20Mn5N high-strength steel belongs to alloy steel, has high strength and good weldability, can be welded and fused with steel structural members well, and has reasonable stress.
The 9-direction steel casting is integrally cast and molded by a mold, so that the consistency of the mechanical properties of the node in all directions can be ensured, the stress is higher and better, and weak stress points can not be formed like assembly welding.
In connection with fig. 4, the wall thickness of the steel casting 9 is changed from the center to the edge from thick to thin, and from the thickness of the whole pipe diameter to 2-3cm of the edge, and the edge position is designed into the form of a necking 10, as shown in fig. 2 and 2. The thickness of the central full pipe diameter, namely the solid part shown in fig. 4, is designed to be thick to thin according to the stress, so that the strength of a central node can be enhanced, the waste of materials is reduced, and conditions are created for welding the same section and thickness of a rear steel structure rod piece.
With continued reference to fig. 2 and 5, a protruding square cover plate 11 is provided at the upper part of the center O of the steel casting 9, and is used as a welding plane to connect with an upper structure, such as an upper purlin bracket, and a binaural plate 12 is provided at the lower part of the center O of the steel casting 9, and is used for connecting with a lower rod (i.e., a lower 9# rod in the 9-direction rod), such as a lower rod such as a lower dome strut. It is easy to understand that the square cover plate 11 has moderate size and thickness, and can meet the process requirement and strength requirement of the upper structure connection, and the double-lug plate 12 can also be replaced by other connection structures or other forms of lug plates, so long as the lower rod piece can be connected. When the double-lug plate is adopted, the rod pieces are connected through the pin shafts, the rod pieces are only required to be forked into the connecting clamping plates, and the pin shafts are connected, so that the overhead working time is shortened, and the construction is convenient and safe.
The following describes the various elements in detail with reference to specific examples.
(1) And 9, designing and manufacturing a steel casting node of the converging space net shell.
Aiming at some novel space reticulated shell structures, the nodes are complex, and 9 or even more than 9 rod members are stressed and converged at one point sometimes, the invention firstly designs 9-direction converged space reticulated shell cast steel nodes through BIM modeling and deepening design, namely, through BIM aided design accurate positioning, simulation calculation design analysis and custom mold blanking processing, designs and manufactures 9-direction converged space reticulated shell cast steel nodes at a central point, and the structure is mainly an axial force tensile compression member when converged at the central point, and the rod members are stressed along the axial direction of the rod members, so that the collineation and the coposition of all the crossed rod members can be ensured, and the stress is simple and clear, namely reasonable; the neck-shrinking opening is designed at the edge position, the protruding square cover plate is designed at the upper part of the center of the steel casting, and the connecting form with the double-lug plates is designed at the lower part of the center of the steel casting, so that the structure is novel, the design is reasonable, the construction is convenient, and the construction requirement is met. BIM modeling specifically can utilize REVEIT software to perform BIM modeling of nodes and closed rings, and then utilize the software to directly make a deep-drawing design.
(2) And (5) performing precision control by using a BIM technology.
The whole process virtual model simulation precision control before installation and in the installation process is realized through the whole process comprehensive technical researches such as installation precision and deformation control, simulation analysis technology, construction procedure simulation technology and the like, BIM construction simulation is combined with steel structure pre-construction and important process construction, BIM three-dimensional visualization is combined with steel structure node deepening, and installation efficiency and precision are ensured. Specifically, the method comprises the following steps:
s201, extracting elevation, axis and coordinate information of each component in the BIM in the early stage of installation and implementation of the latticed shell steel castings and the rod pieces;
s202, performing three-dimensional coordinate measurement and release by using a total station on site, and timely collecting installation errors generated by processing, transportation, installation alignment, temperature and instruments on site;
s203, feeding the collected installation errors back to the BIM model for fine adjustment, and processing and fine adjustment of the next batch of components or adjustment at joints of the steel components installed front and back, so as to eliminate the components section by section. The machining fine adjustment is to integrate the machining fine adjustment into the BIM model again according to the on-site actual measurement feedback, and then correspondingly adjust the size of the next batch of components in the processing plant in advance, so that the steel components can be ensured to be accurately installed, and the occurrence of dislocation, large deviation and the like is avoided.
In the invention, the installation precision and the deformation control are five-level precision control, the welding deformation is critical to the control of the whole installation precision, the deformation control is mainly welding deformation control, and the welding deformation is controlled by adopting a symmetrical layering multi-channel welding technology; the simulation analysis technology mainly utilizes calculation software (such as MIDAS) to calculate stress and deformation generated by different installation sequences and welding sequences, so that reasonable construction sequences and welding sequences are adopted; the construction procedure simulation technology mainly utilizes REVEIT software to carry out virtual simulation installation demonstration on the construction procedures of the node and surrounding ring rod pieces, and provides basis for construction.
(3) The net shell is assembled and formed by ring-by-ring segments.
The first-level precision control of the installation sequence, namely the construction control, is carried out by reasonably adjusting the installation sequence through adopting the net shell ring-by-ring sectional assembly molding technology. Specifically, the method comprises the following steps:
s301, firstly, reasonably segmenting a roof reticulated shell, and assembling single rods of the reticulated shell on the ground to form a small-scale assembling unit;
s302, adopting a fixed reference, namely using a ring of cast steel nodes and rod pieces as the reference of the whole assembly, and sequentially installing the cast steel nodes and the rod pieces on the other rings;
s303, assembling the rings one by one according to the sequence until the last ring, and then closing and butting the rings.
The following is a specific description of single ring assembly molding:
the first step: installing a single-ring inner steel casting and a center positioning steel casting; as shown in fig. 6, fig. 6 shows the overall installation sequence, in the drawing, first installing a single ring inner cast steel and a central positioning cast steel, wherein the central positioning cast steel is the middle-most cast steel node, and the single ring inner cast steel refers to cast steel nodes formed by circumferential rings, and the total number of the cast steel nodes is 8.
And a second step of: assembling the single rod pieces of the net shell into 10-1-10-8 small assembled units on the ground, wherein each small assembled unit comprises 3-5 rod pieces, namely, rod pieces (without steel casting) at the periphery of a circular ring formed by 8 steel casting, and the thick solid line and the thin solid line are shown in fig. 7; the 8 steel casting nodes around are marked as 10-1 to 10-8 in sequence, namely 10-1 to 10-8 small splicing units.
And a third step of: sequentially installing 10-1, 10-2, … and 10-8 small splice units; in FIG. 7, starting with 10-1 mini-tiles, each tile is mounted in its entirety, completing the mounting of 8 tiles, as shown in FIG. 8.
Fourth step: the rod pieces around the 10-1, 10-2, … and 10-8 central steel castings are sequentially installed, namely small splicing units with round periphery are installed firstly, then the rod pieces between the central steel casting and the 8 peripheral steel castings are installed, splicing is completed, and 1# rod pieces to 8# rod pieces are symmetrically installed in groups according to the sequence of 1-2-3-4-5-6-7-8 as shown in fig. 9.
The first-level precision control of the installation sequence is carried out by reasonably adjusting the installation sequence by the ring-by-ring sectional assembly forming technology, so that the precision can be ensured, the processing deformation and the construction error can be adjusted by ring-by-ring sectional assembly forming technology from the inner ring to the outer ring (namely from the inner circle to the outer circle), the deformation and the error can be released to the outer ring, the stress concentration is reduced, and finally the outer ring is closed at the free end, so that the stress concentration phenomenon, the error and the deformation are eliminated.
(4) And (5) machining the butt joint interface.
After the ring-by-ring sectional assembly is completed, a butt joint interface is processed by adopting a machining process, and secondary precision control of the butt joint interface of the steel casting and the rod piece is performed.
The method is characterized in that a stretching necking mode (after a rod piece is assembled in the air) is adopted for machining the stretching necking at the pipe orifice of the steel casting, namely, the stretching necking is carried out at the pipe orifice of the steel casting in advance, the necking smooth transition at the position of the joint of the steel casting is adopted, the round pipe is sleeved into the joint of the steel casting, the interval between the inner wall of the round pipe and the joint of the steel casting is reserved to be not less than 2mm, and the installation precision of the net shell rod piece and the steel casting is ensured.
(5) And installing multiple machines on site to control the precision.
And performing auxiliary installation and positioning on the field installation multiple machines, and performing three-level precision control on the installation position.
As shown in fig. 10, fig. 10 shows that when the multi-tool performs accuracy control and performs 9-direction steel casting installation on site, tools such as hanging belts and multi-direction chain blocks are installed, and the multi-direction chain blocks are respectively hung on the hanging belts to perform auxiliary lifting, positioning and adjustment, so that elevation and angles of the steel casting and related components are controlled, and an accurate installation position is obtained.
(6) And (5) controlling the butt joint of the rod pieces.
And performing four-stage precision control on the butt joint connection of the steel castings and the rod pieces through the rod piece butt joint control. The rod piece butt joint control comprises:
s601, when the net shell rod pieces are in butt joint, 4 positioning plates (horse plates) distributed at equal intervals on the circumference are adopted for temporary fixation, and the positioning plates are welded with cast steel nodes and the rod pieces, as shown in FIG. 11;
s602, after the rod piece and the steel casting are welded, the positioning plate is cut off, the connecting part is polished to be smooth and subjected to paint repairing treatment, the on-site rod piece is in a butt joint completion state as shown in FIG. 12, and FIG. 12 shows a schematic diagram of the connection of one of the 8 steel castings on the periphery with surrounding rod pieces.
(7) And (5) measuring and controlling.
And finally, performing measurement control, and performing reticulated shell rechecking five-level precision control.
As shown in fig. 13, the measurement control specifically uses a plurality of total stations to perform three-dimensional coordinate measurement and release simultaneously, and performs the net shell precision control.
In summary, the invention realizes the control of the precision of the installation process before installation through the comprehensive technical researches of whole processes such as BIM modeling, deepening design, installation precision, deformation control, simulation analysis technology, construction process simulation technology and the like, combines BIM construction simulation with steel structure pre-construction and important process construction, combines BIM three-dimensional visualization with steel structure node deepening design, reasonably adjusts the installation sequence by adopting a ring-by-ring sectional assembly forming technology and the like to control the precision, and mechanically processes a butt joint interface by machining stretching necking and the like at the pipe orifice of a steel casting, thereby ensuring the installation precision of net shell rod pieces and the steel casting; auxiliary installation and positioning are carried out by installing machines such as hanging strips, multi-direction manual hoist and the like; the temporary fixation is carried out by adopting a plurality of horse plates (positioning plates), and rod pieces such as welding and the like are controlled in a butt joint way to ensure the installation precision; and simultaneously, a plurality of total stations are utilized to carry out three-dimensional coordinate measurement and release, and net shell precision control is carried out. Therefore, the installation efficiency and the installation precision are guaranteed, and the method has high popularization and application values.
While several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the invention. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (11)
1. The accurate installation construction method of the 9-direction intersection space net shell cast steel node is characterized in that the 9-direction intersection space net shell cast steel node consists of 9-direction cast steel pieces and 9-direction rod pieces, 8 of the 9-direction rod pieces are intersected with the center of the 9-direction cast steel pieces in the same plane, and 1 of the 9-direction rod pieces are intersected with the center at the lower part of the center of the 9-direction cast steel pieces;
the accurate installation construction method comprises the following steps:
s10, designing a simulation model through BIM, performing design analysis and simulation calculation by the simulation model, customizing the blanking processing of the die, precisely positioning by BIM, and processing and manufacturing the 9-direction intersection space net shell cast steel node;
s20, combining BIM with steel structure construction, and performing overall process simulation control of installation accuracy by using a simulation model;
s30, reasonably adjusting the installation sequence by adopting a latticed shell ring-by-ring sectional assembly molding technology, and performing primary precision control on the installation sequence;
s40, after ring-by-ring sectional assembly is completed, machining is adopted to process the butt joint interface, and secondary precision control of the butt joint interface of the steel casting and the rod piece is carried out;
s50, performing auxiliary installation and positioning by installing multiple machines on site, and performing three-level precision control on the installation position;
s60, performing rod piece butt joint control, and performing four-stage precision control on butt joint connection of the steel castings and the rod pieces;
and S70, measuring and controlling, and performing reticulated shell rechecking five-level precision control.
2. The precise installation and construction method according to claim 1, wherein in S20, the whole process simulation control of the installation precision by using the simulation model in combination with the steel structure construction comprises:
s201, extracting elevation, axis and coordinate information of each component in the BIM in the early stage of installation and implementation of the latticed shell steel castings and the rod pieces;
s202, performing three-dimensional coordinate measurement and release by using a total station on site, and timely collecting installation errors generated by processing, transportation, installation alignment, temperature and instruments on site;
s203, feeding the collected installation errors back to the BIM model for fine adjustment, and processing and fine adjustment of the next batch of components or adjustment of joints of steel components which are installed immediately before and after each other, wherein the joints are eliminated section by section.
3. The precise installation construction method according to claim 1, wherein in S30, the step of using the net shell ring-by-ring segment assembly molding technique comprises:
s301, firstly, reasonably segmenting a roof reticulated shell, and assembling single rods of the reticulated shell on the ground to form a small-scale assembling unit;
s302, adopting a fixed reference, namely using a ring of cast steel nodes and rod pieces as the reference of the whole assembly, and sequentially installing the cast steel nodes and the rod pieces on the other rings;
s303, assembling the rings one by one according to the sequence until the last ring, and then closing and butting the rings.
4. The precise installation construction method according to claim 3, comprising the following steps:
the first step: installing a single-ring inner steel casting and a center positioning steel casting;
and a second step of: assembling the single rod piece of the net shell into a 10-1-10-8 small assembling unit on the ground;
and a third step of: sequentially installing 10-1, 10-2, … and 10-8 small splice units;
fourth step: and sequentially installing the rods around the 10-1, 10-2, … and 10-8 central steel castings in sequence to finish assembly.
5. The precise mounting construction method of claim 1, wherein in S40, the machining the docking interface comprises:
and (3) machining and stretching the pipe orifice of the steel casting in advance to enable the position of the joint of the steel casting to be in shrinkage smooth transition, sleeving the rod piece into the joint of the steel casting, and reserving a distance of not less than 2mm between the inner wall of the rod piece and the joint of the steel casting.
6. The precise installation construction method according to claim 1, wherein in S50, the field installation multi-tool auxiliary installation positioning comprises:
when the 9-direction steel casting is installed on site, hanging strips and multi-direction chain blocks are installed, and the multi-direction chain blocks are hung on the hanging strips respectively to assist in lifting, positioning and adjusting, so that elevation and angle of the steel casting and related components are controlled.
7. The precision mounting construction method of claim 1, wherein in S60, the lever butt control comprises:
s601, when the net shell rod pieces are in butt joint, 4 positioning plates distributed at equal intervals on the circumference are adopted for temporary fixation, and the positioning plates are welded with cast steel nodes and the rod pieces;
s602, after the rod piece and the steel casting are welded, the positioning plate is cut off, and the connecting part is polished to be smooth and subjected to paint repairing treatment.
8. The precise mounting construction method according to claim 1, wherein in S70, the measurement control includes:
and simultaneously, a plurality of total stations are utilized to carry out three-dimensional coordinate measurement and release, and net shell precision control is carried out.
9. A 9-direction intersection space reticulated shell cast steel node constructed by the precise installation construction method of any one of claims 1 to 8, and the 9-direction intersection space reticulated shell cast steel node is composed of 9-direction cast steel pieces and 9-direction rod pieces, 8 of the 9-direction rod pieces meet the center of the 9-direction cast steel pieces in the same plane, and 1 of the 9-direction rod pieces meet the center at the lower part of the center of the 9-direction cast steel pieces.
10. The 9-way converging space net shell cast steel node of claim 9, wherein:
the 9-direction steel casting is made of G20Mn5N high-strength steel, the whole steel casting is formed by casting with a die, the wall thickness is changed from the center to the edge from thick to thin, the thickness of the whole pipe diameter of the center is changed into 2-3cm from the edge, and the edge is designed to be in a neck-shrinking form.
11. The 9-way converging space net shell cast steel node of claim 9, wherein:
the upper part of the center of the 9-direction steel casting is provided with a convex square cover plate which is used as a welding plane to be connected with an upper structure, and the lower part of the center of the 9-direction steel casting is provided with a double lug plate which is used for being connected with a lower rod piece.
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