CN112267709A - Segmented demolition construction method for large-span beam string structure - Google Patents
Segmented demolition construction method for large-span beam string structure Download PDFInfo
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Abstract
The invention discloses a sectional dismantling construction method of a large-span beam string structure, which comprises the following steps: a plurality of breaking points are arranged on the beam string structure, and a supporting jig frame for supporting the beam string structure is arranged at each breaking point; removing a secondary component on the beam string structure, which is irrelevant to maintaining the transverse supporting frame system of the beam string structure; cutting the beam string structure at the breaking point to form a multi-section beam string unit; disconnecting the beam string units from the vertical bearing members of the building, hoisting the beam string units to the ground and then disassembling; and (4) removing the supporting jig frame. The segmental demolition construction method is suitable for beam string structures with various spatial models, the transformation principle of a structural stress system in the demolition process is clear, no special requirements are made on site, the safety is good, the implementation is strong, the influence on the surrounding environment is small, the construction operation is simple, the investment of large-scale hoisting equipment and supporting measures is reduced, the construction cost is saved, and the construction cost is low.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a sectional dismantling construction method of a large-span beam string structure.
Background
The beam string structure is light in self weight and reasonable in stress, and is widely applied to a roof system with a large-span spatial structure. However, as socio-economic development continues, more and more existing buildings cannot meet the rapidly increasing use requirements, and need to be modified or rebuilt according to the requirements of the new era. However, there are many dangers in the process of dismantling the large-span beam string structure, and at the present stage, there are no perfect dismantling technical documents and construction processes, so that high requirements are put forward for dismantling contractors.
At present, the removal precedent of the beam string structure is not collected temporarily, and the existing relevant large-span steel structure removal technology mainly comprises 3 types: firstly, erecting a full supporting system and dismantling the full supporting system in sections; secondly, using a lifter to lower the whole structure to the ground to disintegrate and dismantle the structure; and cutting and blasting demolition technology.
The technology for erecting the full-hall supporting system is as follows: usually, a support system such as a wood structure, a steel pipe scaffold, a prepressing stiffened steel structure and the like is adopted, each temporary support is constructed layer by layer from bottom to top, an operation platform is erected at the bottom of the beam string, and the guy cable and the beam string structure are dismantled in sequence. However, the temporary support of the wood structure has low bearing capacity and is easy to destabilize, a stable anti-lateral system is difficult to form in reconstruction of an ultra-long and ultra-high structure, and the application is limited to a certain extent; the steel pipe scaffold supporting system is arranged at a close interval, so that a sufficient operation surface is difficult to provide for subsequent corresponding processes; the stiff steel structure support needs a large operation surface in the mounting and dismounting process, and is not suitable for being used in the dismounting and reconstruction process of the small space structure.
The technology of lowering the whole structure to the ground for dismantling by a lifter is as follows: arranging a lifting device inside the structure or on the temporary frame body, laying lifting hoisting points, and lowering the whole structure to the ground and then disassembling and dismantling the structure. But the hoister hoists the whole truss, the clearance area at the same elevation below the hoister needs to be ensured, and the requirement on the site is high; all lifting points are operated synchronously, and dismantling personnel are required to have relatively rich construction experience and professional construction skills.
Cutting and blasting demolition technology: the position of a blasting notch is determined through careful design, a sand bag is adopted as a protective material at the blasting part to protect exposed powder charge, a digital electronic detonator is used for blasting time delay control, and blasting demolition is implemented. The technology is successfully applied to the removal of the green island all-steel structure gymnasium. However, blasting construction is high in danger, blasting safety protection measures are large in investment, shock waves and noises need to be effectively controlled, and unexpected protection is well done.
Therefore, a method for dismantling the beam string structure is needed, which has the advantages of low requirement on the site, good construction safety, strong feasibility, small influence on the surrounding environment, simple construction operation, short construction period and low manufacturing cost.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of high requirement on the field, poor construction safety, low feasibility, large influence on the surrounding environment, complex construction operation and high construction cost of the beam string structure dismantling method in the prior art, thereby providing the sectional dismantling construction method of the large-span beam string structure.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a segmental demolition construction method for a large-span beam string structure comprises the following steps:
step S10, arranging a plurality of breaking points on the beam structure and arranging a supporting jig frame for supporting the beam structure at each breaking point;
step S20, performing prestress disassembly on a tension structure member on the beam string structure, and dismantling a tension structure rod piece;
step S30, removing secondary components of the beam string structure unrelated to the transverse supporting frame system for maintaining the beam string structure;
step S40, cutting the beam string structure at the breaking point to form a multi-section beam string unit;
step S50, disconnecting the beam string unit and the original vertical bearing member of the building, hoisting the beam string unit to the ground and then detaching;
and step S60, removing the supporting jig frame and the original vertical bearing member of the building.
Further, in the step S10, in the step S10, the position of the breaking point is determined according to the downwarp deformation position of the beam-string structure and the lifting performance of the lifting device.
Further, in the step S20, the tension structure bar includes a tension cable and a tension rod; the step S20 includes the steps of:
step S201, a jack is adopted to carry out graded unloading on the guy cable, and the unloading tension is respectively 80%, 60% and 0%;
step S202, hoisting the inhaul cable by using hoisting equipment, dismantling the inhaul cable, a lock clamp, a pin shaft and other parts, and removing a fixed node with the inhaul cable, the lock clamp, the pin shaft and other parts;
step S203, hoisting the guy cable to the ground by hoisting equipment, coiling the guy cable, and sorting and stacking the components such as a lock clamp, a pin shaft and the like;
and S204, utilizing hoisting equipment to dismantle the pull rod in sections.
Further, in step S30, the secondary members include one or more of roofing purlins and secondary bars.
Further, in the step S10, a distance between the dividing point and a connecting node on the beam string structure is 600-800 mm.
Further, in the step S30, the cutting the beam string structure at the breaking point specifically includes the following steps:
s401, marking on a rod piece cutting surface of a beam string structure corresponding to a breaking point position;
s402, cutting the rod piece along the mark on the cutting surface of the rod piece in a flame grading cutting mode;
and S403, polishing the cut section of the rod after cutting.
Further, in step S40, the hoisting device for hoisting the beam unit to the ground is provided with at least two hoisting points on the beam unit.
Further, the supporting jig comprises a pair of supporting trusses and a section steel distribution beam erected on the tops of the supporting trusses, wherein the section steel distribution beam and the supporting trusses form a portal structure jig: the middle of the section steel distribution beam is provided with a section steel upright post for supporting a beam string structure, two sides of the section steel upright post are provided with inclined supporting columns for obliquely supporting the section steel upright post, and the bottom ends of the inclined supporting columns are connected to the part, located on the supporting truss, of the section steel distribution beam.
Furthermore, the section steel distribution beam adopts narrow-flange H-shaped steel, and the lower flange of the section steel distribution beam is welded and fixed on the top of the support truss.
Furthermore, the section steel upright posts are wide-flange H-shaped steel or round tubes.
Further, the inclination angle range of the inclined strut is between 45 degrees and 60 degrees.
The technical scheme of the invention has the following advantages:
1. the invention provides a construction method for removing a large-span beam string structure in sections, which comprises the steps of reasonably setting a plurality of breaking points on a beam string structure, setting a supporting jig frame for supporting the beam string structure at each breaking point, changing the beam string structure supported at two ends of a single span into a multi-span support, converting the stress of the beam string structure to the supporting jig frame, firstly removing a tension structure rod piece and a secondary component on the beam string structure, then cutting a main body structure of the beam string structure in sections to form a multi-section beam string unit, finally disconnecting the connection between the beam string structure and an original vertical bearing component of a building, sequentially hoisting the multi-section beam string unit to the ground for dismounting, and finally removing the supporting jig frame and the original vertical bearing component of the building; the sectional dismantling construction method of the large-span beam string structure is suitable for beam string structures with various spatial models and is not limited by spatial forms; the transformation principle of a structural stress system in the dismantling process is clear; the system has no special requirements on site, and has good safety and strong implementation; the method has the advantages of small influence on the surrounding environment, simple construction operation, reduction of the investment of large-scale hoisting equipment, remarkable reduction of the investment of measure amount compared with a full-scale supporting frame, construction cost saving and low construction cost.
2. According to the sectional demolition construction method for the large-span beam string structure, provided by the invention, the breaking point is arranged at the position with larger flexural deformation of the beam string structure, so that the beam string structure can be better supported, a cantilever is prevented from being formed after the beam string structure is sectioned, and the construction safety is improved.
3. The invention provides a construction method for segmental demolition of a large-span beam string structure, which is characterized in that a jack is adopted to carry out graded demolition on a guy cable, hoisting equipment is utilized to hoist the guy cable, parts such as the guy cable, a lock clamp, a pin shaft and the like are demolished, the guy cable is hoisted integrally to the ground, finally, the hoisting equipment is utilized to carry out segmental demolition on a pull rod, the guy cable is coiled, the parts such as the lock clamp, the pin shaft and the like are put in place in a classified manner, the relaxation of constraint prestress at two ends of the beam string structure can be effectively ensured, and the safety and stability of the beam string unit in the demol.
4. According to the sectional dismantling construction method of the large-span beam string structure, provided by the invention, the minor components such as the roof purline, the minor rod piece and the stay cable are firstly dismantled, and then the dismantling sequence of the main body component of the beam string structure is dismantled, so that the requirement on the load capacity of hoisting equipment in the subsequent hoisting process of the beam string unit can be reduced, the hoisting equipment with smaller load capacity can be used, and the construction cost is reduced.
5. The sectional dismantling construction method of the large-span beam string structure provided by the invention is used for independently dismantling secondary members with larger span, such as guy cables in the beam string structure, and is beneficial to performing sectional cutting and hoisting construction on a main body of the beam string structure in the follow-up process.
6. According to the sectional dismantling construction method for the large-span beam string structure, the distance between the breaking point and the connecting node on the beam string structure is kept between 600 mm and 800mm, the main rod piece of the beam string structure can be prevented from being damaged by dismantling the secondary rod piece, and the safety of the construction process is improved.
7. The sectional demolition construction method of the large-span beam string structure provided by the invention has the advantages that when the beam string structure is cut in sections, the flame stepped cutting mode is adopted, so that the internal stress of a rod piece at the cutting surface can be slowly released, and the deformation of the rod piece caused by the sudden release of the stress is prevented; and the incision section is polished after cutting, so that the phenomenon that the incision section is too sharp and is easy to cause injury to constructors can be reduced.
8. According to the sectional demolition construction method for the large-span beam string structure, the beam string unit is at least provided with two hoisting points, so that the safety in the hoisting process can be improved.
9. The support jig frame can effectively provide support constraint of the end part of each beam string unit in the hanging and dismantling process, and ensure the safety and stability of the beam string units in the dismantling process.
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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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a top view of a large span beam string roof construction in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of the sectional position and the support jig arrangement position of the large-span beam string roof structure of FIG. 1;
FIG. 3 is a schematic structural diagram of a large-span beam string roof structure with a supporting jig frame built according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of the large-span beam string structure of FIG. 3 after secondary members such as bracing cables and struts are removed;
FIG. 5 is a schematic structural view of the large-span beam string roof structure of FIG. 4 with a portion of the beam string units removed;
FIG. 6 is a schematic structural view of the roof structure of the large span beam string structure of FIG. 5 after being completely removed;
FIG. 7 is a top view of a supporting jig frame structure in an embodiment of the invention;
fig. 8 is a front view of a supporting jig frame structure in an embodiment of the invention.
Description of reference numerals: 1. a beam string structure; 2. supporting the jig frame; 21. a lattice support; 22. a profile steel distribution beam; 23. a section steel upright post; 24. a diagonal bracing column; 3. a vertical force-bearing member; 4. a pull rope.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1-8, a construction method for dismantling a large-span beam string structure in sections is implemented by first dismantling a secondary member of the beam string structure 1 according to the stress condition of the beam string structure 1, then reasonably segmenting the main structure of the beam string structure 1, sequentially laying and stretching a guy cable 4 by setting up a temporary support, hanging and dismantling a suspender and a beam string structure, and finally dismantling an original vertical bearing member 3 and the temporary support to complete dismantling construction. Taking the sectional hanging and dismantling construction of a single beam string beam as an example, the method specifically comprises the following steps:
step S10, a plurality of breaking points are provided on the beam structure 1, and a supporting jig 2 for supporting the beam structure 1 is provided at each breaking point. The plurality of supporting tire frames 2 can change the single-span beam string structure 1 with two supported ends into a multi-span support, and the stress of the beam string structure 1 is converted to the supporting tire frames 2. The safety of the supporting jig frame 2 and the bearing capacity of a foundation (original structure) at the bottom of the supporting jig frame 2 meet requirements, and the supporting jig frame 2 is arranged to ensure that after the beam string is cut in sections, the strength, rigidity and stability of each section in the independent stress process meet the requirements.
In step S10, the distance between the dividing point and the connection node on the beam-string structure 1 should be set between 600 mm to 800mm, so as to avoid the primary rod member of the beam-string structure 1 from being damaged by the removal of the secondary rod member, and improve the safety of the construction process.
Specifically, the supporting jig 2 includes a pair of supporting trusses 21 and a section steel distribution beam 22 erected on top of the pair of supporting trusses 21, and the section steel distribution beam 22 and the pair of supporting trusses 21 constitute a portal structure jig. The supporting jig frame 2 adopts a design of a portal structure, can avoid the space positions of the stay cables 4 and the stay bars, and forms reliable constraint on the beam string units after segmentation.
The middle of the section steel distribution beam 22 is provided with a section steel upright column 23 for supporting the beam string structure 1, two sides of the section steel upright column 23 are provided with inclined struts 24 for obliquely supporting the section steel upright column 23, and the bottom ends of the inclined struts 24 are connected to the part of the section steel distribution beam 22 on the supporting truss 21; the top of the section steel upright column 23 is welded and fixed with the beam string structure 1. The supporting jig frame 2 can effectively provide supporting constraint of the end parts of the beam string units in the hanging and dismantling process, and ensures the safety and stability of the beam string units in the dismantling process. The length of the section steel distribution beam 22 and the height of the section steel upright 23 are determined according to the space size of the actual project.
Specifically, the section steel distribution beam 22 is narrow-flange H-shaped steel, the section steel distribution beam 22 should be placed at the center of the top of the jig frame, and the contact position of the lower flange of the section steel distribution beam 22 and the top of the jig frame is welded and fixed; the section steel upright column 23 is wide-flange H-shaped steel, and a round pipe can be preferably selected when the beam string structure 1 is heavy. The inclination angle range of the inclined bracing column 24 is between 45 degrees and 60 degrees, so that the integral rigidity of the top tool on the supporting jig frame 2 is enhanced. All the bars of the lattice 21 are fixed by welding to ensure the structural stability of the lattice 21, and the specific cross-sectional size of each bar is determined by calculation based on the actual weight.
In this embodiment, the breaking point on the beam structure 1 is disposed at a position where the beam structure 1 has a large downward deflection, and the distance between the breaking point and the connection node on the beam structure 1 should be set between 600 mm and 800mm, so as to better support the beam structure 1, prevent the beam structure 1 from forming a cantilever after being segmented, avoid the secondary member being removed to damage the main member of the beam structure 1, and improve the safety during the construction process.
Step S20, performing prestress disassembly on a tension structure member on the beam string structure, and dismantling a tension structure rod piece; the tension structure rod comprises a stay cable 4 and a pull (stay) rod. The specific disassembling process of the tension structure rod piece is as follows: step S201, a hydraulic jack is adopted to unload the guy cable in a grading way, and the unloading tension is respectively 80%, 60% and 0%; step S202, hoisting the inhaul cable by using hoisting equipment, dismantling the inhaul cable, a lock clamp, a pin shaft and other parts, and removing a fixed node; step S203, hoisting the guy cable to the ground by hoisting equipment, coiling the guy cable, and sorting and stacking the components such as a lock clamp, a pin shaft and the like; and S204, finally, utilizing hoisting equipment to dismantle the pull rod in sections. The tension beam structure is independently dismantled aiming at the tension structure member with large span, such as the guy cable 4, in the tension beam structure 1, the tension of the two ends of the tension beam structure in a constrained prestress can be effectively guaranteed, the follow-up segmented cutting and hoisting construction of the main body of the tension beam structure 1 can be facilitated, and the safety and the stability of the tension beam unit in the dismantling process can be guaranteed.
And step S30, removing the minor components of the beam string structure 1 which are not related to the transverse supporting frame system for maintaining the beam string structure 1. Wherein, the secondary member includes but is not limited to one or more of roofing purlin, secondary member. The method has the advantages that the secondary components such as the roof purlines and the secondary rods are firstly dismantled, and then the dismantling sequence of the main body component of the beam string structure 1 is dismantled, so that the load capacity requirement on hoisting equipment in the subsequent hoisting process of the beam string unit can be reduced, the hoisting equipment with smaller load capacity can be used, and the construction cost is reduced.
Specifically, during the process of removing the secondary member, the position of the cut at the time of removing the secondary member should extend inward by 50mm at the end of the secondary member and away from the node, so as to avoid the primary member of the beam string structure 1 from being damaged by the removal of the secondary member. The disassembled rod pieces are sorted and stacked orderly according to the section size and the material type. The determination of the removal sequence and the quantity of the secondary components is guaranteed by relevant calculation analysis on the basis of theoretical inference.
And step S40, cutting the beam string structure 1 at the breaking point to form a multi-section beam string unit. The cutting of the beam string structure 1 at the breaking point specifically comprises the following steps: step S301, before cutting, marking the rod piece cutting surface corresponding to the breaking point position of the beam string structure 1 by winding a circle with white lime fully coated by a wire rope; step S302, performing flame grading cutting on site, and cutting the rod piece along the mark on the cutting surface of the rod piece; and step S303, polishing the cut section of the rod after cutting. When the beam string structure 1 is cut in sections, the internal stress of the rod piece at the cutting surface can be released slowly by adopting a flame grading cutting mode, so that the deformation of the rod piece caused by the sudden release of the stress is prevented; and the incision section is polished after cutting, so that the phenomenon that the incision section is too sharp and is easy to cause injury to constructors can be reduced.
And step S50, disconnecting the beam string units from the original structural columns of the building, hoisting the beam string units to the ground, then disassembling the beam string units, and recovering the disassembled rods. And the beam string units are disassembled and hoisted one by one from the edge.
Specifically, in the hoisting process, the hoisting equipment for hoisting the beam string unit to the ground is provided with at least two hoisting points on the beam string unit so as to ensure the safety in the hoisting process.
And step S60, removing the supporting jig frame 2 and the building original structural column.
The construction method for the sectional demolition of the large-span beam structure comprises the steps of reasonably arranging a plurality of breaking points on a beam structure 1, arranging a supporting jig frame 2 for supporting the beam structure 1 at each breaking point, changing the beam structure 1 with the single span and supported at two ends into a multi-span support, converting the stress of the beam structure 1 into the supporting jig frame 2, firstly dismantling a stretching structure member and a secondary member on the beam structure 1, then carrying out sectional cutting on the main structure of the beam structure 1 to form a plurality of beam units, finally disconnecting the connection between the beam structure 1 and an original vertical bearing member 3 of a building, sequentially hoisting the beam units to the ground for dismounting, and finally dismantling the supporting jig frame 2 and the original vertical bearing member 3 of the building; the sectional demolition construction method of the large-span beam string structure is suitable for beam string structures 1 with various spatial models and is not limited by spatial forms; the transformation principle of a structural stress system in the dismantling process is clear; the system has no special requirements on site, and has good safety and strong implementation; the method has the advantages of small influence on the surrounding environment, simple construction operation, reduction of the investment of large-scale hoisting equipment, remarkable reduction of the investment of measure amount compared with a full-scale supporting frame, construction cost saving and low construction cost.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A segmental demolition construction method for a large-span beam string structure is characterized by comprising the following steps:
step S10, arranging a plurality of breaking points on the beam structure and arranging a supporting jig frame for supporting the beam structure at each breaking point;
step S20, performing prestress disassembly on a tension structure member on the beam string structure, and dismantling a tension structure rod piece;
step S30, removing secondary components of the beam string structure unrelated to the transverse supporting frame system for maintaining the beam string structure;
step S40, cutting the beam string structure at the breaking point to form a multi-section beam string unit;
step S50, disconnecting the beam string unit and the original vertical bearing member of the building, hoisting the beam string unit to the ground and then detaching;
and step S60, removing the supporting jig frame and the original vertical bearing member of the building.
2. The segmental demolition construction method for a large-span beam string structure according to claim 1, wherein in the step S10, the position of the breaking point is determined according to the downwarp deformation position of the beam string structure and the hoisting performance of the hoisting equipment.
3. The segmental demolition construction method of a long-span beam string structure according to claim 1, wherein in the step S20, the tension structure bars include guy cables and tie rods; the step S20 includes the steps of:
step S201, a jack is adopted to carry out graded unloading on the guy cable, and the unloading tension is respectively 80%, 60% and 0%;
step S202, hoisting the inhaul cable by using hoisting equipment, dismantling the inhaul cable, a lock clamp, a pin shaft and other parts, and removing a fixed node with the inhaul cable, the lock clamp, the pin shaft and other parts;
step S203, hoisting the guy cable to the ground by hoisting equipment, coiling the guy cable, and sorting and stacking the components such as a lock clamp, a pin shaft and the like;
and S204, utilizing hoisting equipment to dismantle the pull rod in sections.
4. The segmental demolition construction method for a long-span beam string structure according to claim 1, wherein in the step S30, the secondary members include one or more of roofing purlins and secondary bars.
5. The sectional demolition construction method of a large-span beam string structure according to claim 1, wherein in the step S10, the distance between the breaking point and the connecting node on the beam string structure is 600-800 mm.
6. The sectional demolition construction method of the large-span beam string structure according to claim 1, wherein the step S40 of cutting the beam string structure at the breaking point specifically includes the steps of:
s401, marking on a rod piece cutting surface of a beam string structure corresponding to a breaking point position;
s402, cutting the rod piece along the mark on the cutting surface of the rod piece in a flame grading cutting mode;
and S403, polishing the cut section of the rod after cutting.
7. The segmental demolition construction method for a long-span beam string structure according to claim 1, wherein in the step S40, the hoisting device for hoisting the beam string unit to the ground is provided with at least two hoisting points on the beam string unit.
8. The segmental demolition construction method for a large-span beam string structure according to claim 1, wherein the supporting jig comprises a pair of supporting trusses and a section steel distribution beam erected on top of the pair of supporting trusses, and the section steel distribution beam and the pair of supporting trusses form a gantry type structure jig: the middle of the section steel distribution beam is provided with a section steel upright post for supporting a beam string structure, two sides of the section steel upright post are provided with inclined supporting columns for obliquely supporting the section steel upright post, and the bottom ends of the inclined supporting columns are connected to the part, located on the supporting truss, of the section steel distribution beam.
9. The segmental demolition construction method for a long-span beam string structure according to claim 8, wherein the section steel distribution beam is narrow-flange H-section steel, and the lower flange of the section steel distribution beam is welded and fixed to the top of the lattice.
10. The segmental demolition construction method of a long-span beam string structure according to claim 8, wherein the section steel column is wide-flange H-shaped steel or a round pipe.
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| CN202011106554.1A CN112267709A (en) | 2020-10-15 | 2020-10-15 | Segmented demolition construction method for large-span beam string structure |
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| CN202011106554.1A CN112267709A (en) | 2020-10-15 | 2020-10-15 | Segmented demolition construction method for large-span beam string structure |
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| CN113123635A (en) * | 2021-04-07 | 2021-07-16 | 中国建筑第八工程局有限公司 | Protective dismantling construction method for single truss of net rack structure ring support |
| CN114150891A (en) * | 2021-12-30 | 2022-03-08 | 柳州欧维姆工程有限公司 | Inhaul cable replacing method for space cable net supporting structure |
| CN114182821A (en) * | 2021-12-22 | 2022-03-15 | 陕西省建筑科学研究院有限公司 | Bottom-pumped large-span prestressed concrete beam structure system and construction method |
| CN114856245A (en) * | 2022-05-23 | 2022-08-05 | 中建钢构工程有限公司 | Method for dismantling net rack |
| CN115110776A (en) * | 2022-07-26 | 2022-09-27 | 中建钢构工程有限公司 | Construction method of beam string and beam string |
| CN117166816A (en) * | 2023-11-03 | 2023-12-05 | 北京市第三建筑工程有限公司 | Method for dismantling overhanging arc-shaped beam of high-rise building |
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| CN117166816B (en) * | 2023-11-03 | 2024-04-12 | 北京市第三建筑工程有限公司 | Method for dismantling overhanging arc-shaped beam of high-rise building |
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Application publication date: 20210126 |