CN113737951B - Measurement and control method for deformation control of installation of large-span multi-joint steel structure - Google Patents
Measurement and control method for deformation control of installation of large-span multi-joint steel structure Download PDFInfo
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- CN113737951B CN113737951B CN202111108809.2A CN202111108809A CN113737951B CN 113737951 B CN113737951 B CN 113737951B CN 202111108809 A CN202111108809 A CN 202111108809A CN 113737951 B CN113737951 B CN 113737951B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B1/5806—Connections for building structures in general of bar-shaped building elements with a cross-section having an open profile
- E04B1/5812—Connections for building structures in general of bar-shaped building elements with a cross-section having an open profile of substantially I - or H - form
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
- E04B1/5837—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially circular form
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
- E04B1/5837—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially circular form
- E04B1/5843—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially circular form with ends provided with protuberances
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/18—Adjusting tools; Templates
- E04G21/1841—Means for positioning building parts or elements
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- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a measuring and controlling method for large-span multi-joint steel structure installation deformation control, which comprises the installation of a column section and the installation of a beam section, wherein the installation of the column section realizes installation butt joint and verticality adjustment through a guide chute, a pre-embedded I-shaped steel counterforce support, a jack and a bracket counterforce support, the installation of the beam section realizes opening installation butt joint through the matching of a connecting plate, a web plate and a steel wire rope, and the column bottom anchoring, the inter-column connection and the beam-column connection are completed, so that the large-span multi-joint steel structure installation is realized. The construction period requirement is guaranteed, and the engineering construction cost is saved.
Description
Technical Field
The invention belongs to the technical field of civil engineering construction, and particularly relates to a measurement and control method for deformation control of installation of a large-span multi-joint steel structure.
Background
With the high-speed development of the urbanization process, the urban underground space construction solves a series of urban problems such as shortage of land resources, narrow urban space, traffic jam and the like, and the networking of urban rail transit construction is to form more and more transfer nodes at the intersection of the wire nets and to complete the space structure through space communication and integration. Due to the limitation of installation conditions in construction sites, a steel structure generally needs to be divided into a plurality of sections for field installation and connection (bolting), and due to the limitation of transportation conditions and hoisting capacity, steel pipe columns and steel beams need to be in-site multi-segment butt joint, the field butt joint welding and bolt connection engineering quantity is very large, and the requirement on the butt joint precision of the steel beams is very high. How to carry out the field installation to the large-span polylinker steel construction and guarantee the installation accuracy is a technical problem who awaits solution urgently.
Disclosure of Invention
The invention aims to provide a measurement and control method for large-span multi-joint steel structure installation deformation control, which can realize the large-span multi-joint steel structure installation deformation control, so that the accurate positioning of axis deviation, perpendicularity and flatness adjustment in the installation process of large-span multi-joint steel column nodes and beam sections is realized, and the accurate folding of the nodes is ensured.
The technical solution to achieve the above object is as follows:
a measurement and control method for deformation control in installation of a large-span multi-joint steel structure, wherein the multi-joint steel structure comprises a beam section and a column section, and the method comprises the following steps:
the method comprises the following steps: installing the bottom column section on the lower layer of the bearing platform: measuring the center point of a lofting steel column of a lower-layer embedded steel plate of a bearing platform, welding a plurality of guide chutes on the embedded steel plate, installing a column section downwards along the vertical direction, ensuring that a positioning sheet at the bottom of the column section slides into the corresponding guide chute, paying attention to bolt installation position alignment in the installation and positioning process, if an error exists in the positioning axis of the column foot bottom, embedding an I-shaped steel counter-force support at a preset distance from the embedded steel plate along the cross line direction of the column section during the lower-layer construction of the bearing platform, supporting the I-shaped steel counter-force support by a jack for axis fine adjustment after positioning deviation, and cutting off the guide chutes before fine adjustment;
step two: adjusting the verticality of the bottom column section: the column base is installed in place, after the axis adjustment is correct, the verticality of the bottom column section is measured, if the measurement has deviation, a bracket counter-force support is arranged on the column body in the direction of the verticality deviation of the bottom column section, and a jack is adopted for reverse jacking adjustment;
step three: the column section connection is realized: installing a positioning clamp plate on the T-shaped steel in the column section installed at the lower part, enabling the upper part of the positioning clamp plate to extend out of the column section installed at the lower part and form a gap, then installing the column section at the upper part downwards along the vertical direction, enabling the T-shaped steel in the column section at the upper part to be smoothly inserted into the gap of the positioning clamp plate, and after the T-shaped steel in the column section at the upper part is inserted into the gap of the positioning clamp plate, slowly lowering and installing in place, and then installing a bolt on the positioning clamp plate to realize fixation between the column sections at the upper part and the lower part;
step four: the beam section connection is realized: the upper side and the lower side of a bottom plate of one side beam are respectively installed with one end of a connecting plate, a part of bolts are installed between the connecting plate and the bottom plate of one side beam without being screwed, the upper side connecting plate is connected with a top plate of one side beam through steel wires, the other end of the connecting plate extends out of the bottom plate of one side beam and forms an opening, two webs are installed on the side plate of one side beam, a part of bolts are installed between one end of each web and the side plate of one side beam without being screwed, the other end of each web extends out of the side plate of one side beam and forms a gap, the other side beam is butted with the one side beam, so that the bottom plate of the other side beam is inserted into the opening and the side plate is inserted into the gap, after the installation accuracy is achieved, the steel wires are removed, the bolts are installed between the connecting plate and the bottom plates of the one side beam and the other side beam, and the bolts are installed between the webs and the side plates of the one side beam and the other side beam.
And further, in the third step, temporary support brackets are respectively arranged at the butt joint positions of the upper column section and the lower column section, the butt joint of the butt joint surfaces of the upper temporary support bracket and the lower temporary support bracket is realized after the upper column section and the lower column section are installed in place, and the installation verticality of the upper column section is judged according to the butt joint degree of the butt joint surfaces.
Further, if the installation verticality of the upper column section needs to be adjusted, connecting points of the chain block are respectively arranged in the upper column section and the lower column section according to the direction needing to be adjusted, the chain block is pulled to adjust the installation verticality of the upper column section after the chain block is connected, and whether the verticality meets the requirement is judged according to the butt joint condition of the butt joint surfaces of the upper temporary support bracket and the lower temporary support bracket.
Further, the column section is a round steel column or a section steel column.
Furthermore, the number of the guide sliding grooves is four, and the guide sliding grooves are distributed in a cross-shaped symmetrical mode.
Further, the lower part of the beam sections is connected with the column sections.
Furthermore, the guide sliding groove is made of a steel plate with the thickness of 20mm, the height of the steel plate is 350mm, the width of the lower portion of the steel plate is 200mm, the width of the upper portion of the steel plate is 100mm, the lower portion of the guide sliding groove is welded above the embedded steel plate through single-side welding, and a 2mm seam is reserved between the lower portion of the guide sliding groove and a column base of the column section at the bottom of the guide sliding groove to guarantee that the column section at the upper portion is smoothly placed.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a multi-joint steel structure, which comprises a beam section and a column section, wherein the installation process comprises the installation of the column section and the installation of the beam section, the installation of the column section realizes installation butt joint and verticality adjustment through a guide chute, a pre-embedded I-shaped steel counterforce support, a jack and a bracket counterforce support, the installation of the beam section realizes opening installation butt joint through the matching of a connecting plate, a web plate and a steel wire rope, the column section can be connected to the lower part of the beam section, and the column section can be connected with the lower layer of a bearing platform or the upper part of the beam section to complete column bottom anchoring, inter-column connection and beam-column connection, thereby realizing the installation of the large-span multi-joint steel structure, realizing the installation deformation control of the large-span multi-joint steel structure, ensuring the accurate positioning of the axis deviation, verticality and flatness adjustment in the installation process of the large-span multi-joint steel column nodes and the beam sections, ensuring the accurate folding of the nodes, and ensuring the reasonable stress of the large-span steel structure under the complex environment, the linear shape is smooth-going, and each operating mode structure all is in the atress state that accords with standard and design requirement in the simultaneous construction process, can improve the security of work progress finally, guarantees the time limit for a project requirement, practices thrift engineering construction cost.
Drawings
FIG. 1 is a schematic view of the connection between a round steel column and a lower layer of a bearing platform.
Fig. 2 is a schematic view of adjustment of a column shoe bottom positioning axis of a round steel column.
Fig. 3 is a schematic diagram of adjusting the verticality of the column base of the round steel column.
FIG. 4 is a schematic view of the connection of the section steel column to the lower deck of the platform.
Fig. 5 is a schematic view of adjustment of the column base positioning axis of the section steel column.
Fig. 6 is a schematic diagram illustrating adjustment of the column base perpendicularity of the section steel column.
Fig. 7 is a schematic cross-sectional view of the butt joint installation of upper and lower round steel columns.
Fig. 8 is a schematic longitudinal section view of the butt joint installation of the upper and lower round steel columns.
Fig. 9 is a schematic view of the positioning splint.
Fig. 10 is a schematic view of a first view of a beam segment connection.
Fig. 11 is a schematic view of a second view of a beam segment connection.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
A measurement and control method for deformation control in installation of a large-span multi-joint steel structure, wherein the multi-joint steel structure comprises a beam section and a column section, and the method comprises the following steps:
the method comprises the following steps: with reference to fig. 1 and 4, the bottom column section 2 is mounted on the lower layer 3 of the bearing platform: measuring the center point of a lofting steel column of a lower-layer embedded steel plate 5 of a bearing platform, welding a plurality of guide chutes 1 on the embedded steel plate, installing a column section downwards along the vertical direction, ensuring that a positioning piece 4 at the bottom of the column section slides into the corresponding guide chute 1, paying attention to the alignment of a bolt installation position in the installation and positioning process, if the positioning axis of the column base has an error, combining with the drawings 2 and 5, embedding an I-shaped steel counter-force support 6 at a preset distance from the embedded steel plate along the cross line direction of the column section during the lower-layer construction of the bearing platform, supporting the I-shaped steel counter-force support 6 by a jack 7 for fine axis adjustment after the positioning has a deviation, and cutting off the guide chutes 1 before the fine adjustment;
step two: adjusting the verticality of the bottom column section 2: with reference to fig. 3 and 6, the column base is installed in place, after the axis adjustment is correct, the verticality of the bottom column section 2 is measured, if the measurement has deviation, a bracket counterforce support 8 is arranged on the column body in the direction of the verticality deviation of the bottom column section 2, and a jack 7 is adopted for reverse jacking adjustment;
step three: the column section connection is realized: with reference to fig. 7 and 8, a positioning clamp plate 10 is installed on the T-shaped steel 9 in the column section installed at the lower part, the upper part of the positioning clamp plate 10 extends out of the column section installed at the lower part and forms a gap, then the column section at the upper part is installed downwards along the vertical direction, so that the T-shaped steel 9 in the column section at the upper part is smoothly inserted into the gap of the positioning clamp plate 10, after the T-shaped steel 9 in the column section at the upper part is inserted into the gap of the positioning clamp plate 10, the positioning clamp plate 10 is slowly lowered and installed in place, a bolt 13 is installed on the positioning clamp plate 10 to realize fixation between the column sections at the upper part and the lower part, after the steel pipe column is aligned, the positioning clamp plate is immediately connected and fixed by an M24 bolt, after the fixation, a measurer immediately rechecks the verticality and the coordinate of the steel pipe column, and if the requirements are met, the positioning clamp plate is immediately welded;
step four: the beam section connection is realized: referring to fig. 10 and 11, the upper and lower sides of the bottom plate of one side beam 14 are respectively mounted with one end of a connecting plate 15, a part of bolts are mounted between the connecting plate 15 and the bottom plate of one side beam 14 without screwing, the upper connecting plate 15 is connected with the top plate of one side beam 14 by a wire rope 16, the other end of the connecting plate 15 extends out of the bottom plate of one side beam 14 and forms an opening, a couple of webs 17 are mounted on the side plate of one side beam 14, a part of bolts are mounted between one end of the couple of webs 17 and the side plate of one side beam 14 without screwing, the other end of the couple of webs 17 extends out of the side plate of one side beam 14 and forms a gap, the other side beam 18 is butted against the one side beam, so that the bottom plate of the other side beam 18 is inserted into the opening and the side plate is inserted into the gap, the wire rope 16 is removed after mounting accuracy is achieved, and the bolts are mounted between the connecting plate 15 and the bottom plates of one side beam 14 and the other side beam 18, the web 17 is bolted to the side plates of one side member 14 and the other side member 18.
Further, with reference to fig. 7 and 8, in the third step, the temporary support brackets 11 are respectively arranged at the butt joints of the upper column section and the lower column section, so that the butt joints of the upper temporary support bracket 11 and the lower temporary support bracket 11 are ensured to be in butt joint after the upper column section and the lower column section are installed in place, and the installation verticality of the upper column section is judged according to the butt joint degree of the butt joints.
Further, with reference to fig. 7 and 8, if the installation verticality of the upper column section needs to be adjusted, the connection points of the chain block 12 are respectively arranged in the upper column section and the lower column section according to the direction needing to be adjusted, the chain block 12 is pulled to adjust the installation verticality of the upper column section after being connected with the chain block 12, and whether the verticality meets the requirement is judged according to the butting condition of the butting faces of the upper temporary support bracket 11 and the lower temporary support bracket 11. Location splint and interim support bracket are fixed a position the installation after the steel-pipe column of mill is assembled in advance to be qualified, mainly used steel-pipe column straightness accurate control that hangs down to prevent that steel-pipe column straightness hangs down and produces the deviation, avoid repeated adjustment, influence the construction progress. And the positioning clamping plates are standard parts, and positioning and hole taking are carried out on the T-shaped steel of the upper steel pipe column and the lower steel pipe column of the interface according to the bolt hole positions of the clamping plates only after the pre-assembly is qualified.
Further, the column section is a round steel column or a section steel column.
Furthermore, the number of the guide chutes 1 is four, and the guide chutes are distributed in a cross-shaped symmetrical manner.
Further, the lower part of the beam sections is connected with the column sections.
Furthermore, the guide chute 1 is made of a steel plate with the thickness of 20mm, the height of the steel plate is 350mm, the width of the lower part of the steel plate is 200mm, the width of the upper part of the steel plate is 100mm, the lower part of the guide chute is welded above the embedded steel plate through single-side welding, and a 2mm seam is reserved between the lower part of the guide chute 1 and a 2 column base of the bottom column section to ensure that the upper column section is smoothly placed.
The column section can be connected to the lower part of the beam section, the column section can be connected with the lower layer of the bearing platform or the upper part of the beam section, and the connection can be realized between columns, between beams and between columns, so that the installation of a large-span multi-joint steel structure is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a observe and control method that is used for large-span multi-joint steel construction installation deformation control, the multi-joint steel construction includes beam section and column section, its characterized in that, the method includes following step:
the method comprises the following steps: installing the bottom column section (2) on the lower layer (3) of the bearing platform: measuring the center point of a lofting steel column of a lower-layer embedded steel plate (5) of a bearing platform, welding a plurality of guide chutes (1) on the embedded steel plate, installing a column section downwards along the vertical direction, ensuring that a positioning sheet (4) at the bottom of the column section slides into the corresponding guide chute (1), paying attention to bolt installation position alignment in the installation and positioning process, if an error exists in a column base positioning axis, embedding an I-shaped steel counter-force support (6) at a preset distance from the embedded steel plate along the cross line direction of the column section during the lower-layer construction of the bearing platform, supporting the I-shaped steel counter-force support (6) by a jack (7) after the positioning deviation exists for axis fine adjustment, and cutting off the guide chutes (1) before the fine adjustment;
step two: adjusting the verticality of the bottom column section (2): the column base is installed in place, after the axis adjustment is correct, the verticality of the bottom column section (2) is measured, if the measurement has deviation, a bracket counterforce support (8) is arranged on the column body in the verticality deviation direction of the bottom column section (2), and a jack (7) is adopted for reverse jacking adjustment;
step three: the column section connection is realized: installing a positioning clamp plate (10) on T-shaped steel (9) in a column section installed at the lower part, enabling the upper part of the positioning clamp plate (10) to extend out of the column section installed at the lower part and form a gap, then installing the column section at the upper part downwards along the vertical direction, enabling the T-shaped steel (9) in the column section at the upper part to be smoothly inserted into the gap of the positioning clamp plate (10), slowly lowering and installing the T-shaped steel (9) in the column section at the upper part after being inserted into the gap of the positioning clamp plate (10), and installing a bolt (13) on the positioning clamp plate (10) to realize fixation between the column sections at the upper part and the lower part;
step four: the beam section connection is realized: the upper side and the lower side of the bottom plate of one side beam (14) are respectively installed with one end of a connecting plate (15), a part of bolts are installed between the connecting plate (15) and the bottom plate of one side beam (14) and are not screwed, the upper side connecting plate (15) is connected with the top plate of one side beam (14) through a steel wire rope (16), the other end of the connecting plate (15) extends out of the bottom plate of one side beam (14) and forms an opening, two webs (17) are installed on the side plate of one side beam (14), a part of bolts are installed between one end of each web (17) and the side plate of one side beam (14) and are not screwed, the other end of each web (17) extends out of the side plate of one side beam (14) and forms a gap, the other side beam (18) is butted with the bottom plate of the other side beam (18) inserted into the opening and the side plate inserted into the gap, and the steel wire rope (16) is removed after installation accuracy is achieved, The connecting plate (15) is bolted to the bottom plates of one side beam (14) and the other side beam (18), and the web (17) is bolted to the side plates of one side beam (14) and the other side beam (18).
2. The measurement and control method for the installation deformation control of the large-span multi-joint steel structure according to claim 1, wherein in the third step, temporary support brackets (11) are respectively arranged at the butt joint positions of the upper column section and the lower column section, so that the butt joint of the butt joint surfaces of the upper temporary support brackets (11) and the lower temporary support brackets (11) is realized after the upper column section and the lower column section are installed in place, and the installation verticality of the upper column section is judged according to the butt joint degree of the butt joint surfaces.
3. The measurement and control method for the installation deformation control of the large-span multi-joint steel structure according to claim 2 is characterized in that if the installation verticality of the upper column section needs to be adjusted, connection points of the chain block (12) are respectively arranged in the upper column section and the lower column section according to the direction needing to be adjusted, the chain block (12) is pulled to adjust the installation verticality of the upper column section after the chain block (12) is connected, and whether the verticality meets the requirement is judged according to the butt joint condition of the butt joint surfaces of the upper temporary support bracket (11) and the lower temporary support bracket.
4. The measurement and control method for installation deformation control of the large-span multi-joint steel structure according to claim 1, wherein the column section is a round steel column or a section steel column.
5. The measurement and control method for the installation deformation control of the large-span multi-joint steel structure according to claim 1, wherein the number of the guide chutes (1) is four, and the guide chutes are distributed in a cross-shaped symmetrical manner.
6. The measurement and control method for the installation deformation control of the large-span multi-joint steel structure according to claim 1, wherein the column section is connected to the lower part of the beam sections.
7. The measurement and control method for the installation deformation control of the large-span multi-joint steel structure according to claim 5, wherein the guide sliding groove (1) is made of a steel plate with the thickness of 20mm, the height of the steel plate is 350mm, the width of the lower portion of the steel plate is 200mm, the width of the upper portion of the steel plate is 100mm, the lower portion of the steel plate is welded above the embedded steel plate through single-side welding, and a 2mm seam is reserved between the lower portion of the guide sliding groove (1) and a column base of the bottom column section (2) so as to ensure that the upper column section is smoothly lowered.
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| CN202111108809.2A CN113737951B (en) | 2021-09-22 | 2021-09-22 | Measurement and control method for deformation control of installation of large-span multi-joint steel structure |
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| JP4943747B2 (en) * | 2006-06-26 | 2012-05-30 | 株式会社竹中工務店 | Column base structure and construction method of steel pipe column |
| JP5184311B2 (en) * | 2008-11-17 | 2013-04-17 | 鉄建建設株式会社 | Steel structure construction method |
| CN101736697B (en) * | 2009-12-15 | 2011-06-01 | 中交路桥华北工程有限公司 | Construction method for pushing and furling complete bracket of steel box girders |
| CN105568853B (en) * | 2014-10-09 | 2017-03-01 | 中铁十局集团有限公司 | Wide-span reinforced concrete flitch-trussed beam side position is traversing, the construction method of the beam that falls |
| CN105822079B (en) * | 2016-03-25 | 2017-10-20 | 浙江省建筑设计研究院 | A kind of method for being used to control to increase structural column vertical deformation after basement |
| CN105839919B (en) * | 2016-03-29 | 2018-01-12 | 中国建筑第二工程局有限公司 | Sectional hoisting construction method for large-span ultrahigh-section steel frame |
| CN107013038B (en) * | 2017-05-08 | 2019-10-29 | 福建省涵城建设工程有限公司 | A kind of steel structure slipping of building roof lighting Zhongting changes column construction method |
| CN107905542A (en) * | 2017-11-07 | 2018-04-13 | 中国二冶集团有限公司 | The construction method of flange plate deformation during a kind of control H profile steel plate-girder upset |
| CN109138446A (en) * | 2018-09-30 | 2019-01-04 | 中建七局第二建筑有限公司 | A kind of Node In Large-span Pipe Truss hanging method |
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