CN115788033A - Construction method of large-span slab-free frame beam - Google Patents
Construction method of large-span slab-free frame beam Download PDFInfo
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- CN115788033A CN115788033A CN202211407448.6A CN202211407448A CN115788033A CN 115788033 A CN115788033 A CN 115788033A CN 202211407448 A CN202211407448 A CN 202211407448A CN 115788033 A CN115788033 A CN 115788033A
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Abstract
The invention provides a method for constructing a large-span slab-free frame beam, which sequentially comprises the following steps of: measuring and paying off, erecting an overhanging scaffold, erecting a bearing scaffold, constructing a template, constructing reinforcing steel bars, pre-embedding PVC (polyvinyl chloride), constructing an embedded part, checking and accepting, simultaneously pouring concrete on a top beam, a top plate and a frame column, dismantling the template, curing the concrete, dismantling a bearing frame and dismantling the overhanging scaffold. The invention analyzes and researches the difficult points and characteristics in the construction of the structure aiming at the characteristics of the slab-free frame structure (comprising a framework, an anti-seismic beam and the like), takes measures in a targeted manner, improves the traditional construction process, ensures the safety and quality in the construction of the structure and meets the requirement of construction progress.
Description
Technical Field
The invention relates to the technical field of slab-free frame beam construction, in particular to a large-span slab-free frame beam construction method.
Background
At present, a plurality of plate-free frame structures used in China are common such as building frames, anti-seismic connecting beams, water towers, coal conveying trestles and the like. About the construction technology of this type of structure, because the frame roof beam interval is less, often adopt the construction method who sets up full hall scaffold, this is not only the material quantity big to the great high-rise structure of area, the construction period is long, construction cost is high, full hall support body dead weight is great moreover, and the support body bearing surface needs satisfy intensity, the rigidity requirement, the whole safe influence factor of formwork support body is many, easily receive the steel pipe, the influence of material quality such as fastener, it influences to change subjective factors such as the weak or thorough bottom of meeting of receiving workman's consciousness.
Disclosure of Invention
In order to solve the problems, the invention discloses a construction method of a large-span slab-free frame beam, which analyzes and researches the difficult points and characteristics in the construction of the slab-free frame structure (comprising a framework, an anti-seismic beam and the like) aiming at the characteristics of the slab-free frame structure, takes measures in a targeted manner, improves the traditional construction process, ensures the safety and quality in the construction of the structure, and meets the requirement of construction progress.
The specific scheme is as follows:
the construction method of the large-span slab-free frame beam is characterized by sequentially comprising the following steps of: measuring and paying off, erecting a cantilever scaffold, erecting a bearing scaffold, constructing a template, constructing a steel bar, pre-embedding PVC (polyvinyl chloride), constructing an embedded part, checking and accepting, simultaneously pouring concrete on a top beam, a top plate and a frame column, dismantling the template, curing the concrete, dismantling a bearing frame and dismantling the cantilever scaffold.
In this embodiment, the construction order that the scaffold of encorbelmenting set up does in proper order: the method comprises the steps of preparation before construction, steel cantilever beams, wall-penetrating screws, PVC sleeve processing, steel cantilever beam installation, formwork erection, frame body safety protection, main structure construction and frame body dismantling.
In this embodiment, the preparation before construction specifically includes: firstly, determining the number of steel outrigger arrangement layers according to the design size, reinforcement arrangement, progress plan and layer height of a frame beam, arranging the steel outriggers along each layer of the frame beam from a 10m layer, wherein the distance lm is formed, and 14# I-steel is selected by calculation to meet the requirements for manufacturing, specifically adopting the 14# I-steel as the steel outriggers, welding 10# channel steel clamping plates close to two sides of the frame beam for fixing the steel outriggers and ensuring that a support frame is fixed firmly; secondly, the instant bearing capacity of the frame beam needs to be rechecked, 15 days are needed for each layer after the construction of frame erection, steel bar construction, template installation, embedded part installation and the like is finished, the concrete strength is 80% of the designed bearing capacity at the moment, the lower-layer beam bottom supporting frame is not dismounted, the load born by the frame beam is less than 10% of the designed bearing capacity at the moment, and the structure safety can be met. According to the approved construction scheme, a material plan is listed, and practical materials and machines are arranged in advance.
The used material requirements are specifically as follows: the I-steel and channel steel materials and physical properties must meet the national requirements and are accompanied by material quality certificates and physical property certificates. The steel pipe adopts national standards, the surface of the steel pipe is flat and smooth, and the steel pipe does not have cracks, scars, layering, dislocation, hard bending, hair, hole marks and deep scribing, and the steel pipe is strictly prohibited from being punched. The fastener is made of malleable cast iron. The material of the fastener is in accordance with the regulations of the current national standard, namely steel pipe scaffold fasteners, and the quality of the fastener made of other materials can be used after the quality of the fastener is proved to be in accordance with the regulations of the standard through experiments.
In this embodiment, the manufacturing and installation of the steel cantilever beam specifically include:
(1) Processing I-steel outriggers according to the width of the frame beam and the frame body, wherein the length of the I-steel outriggers is the sum of the width of the frame body, the size of the outer vertical rod from the end of the steel beam and the distance between the inner vertical rods of the frame beam bottom support;
(2) Welding 100mm high-diameter 25mm anti-slip steel bars on the steel cantilever beam corresponding to the upright stanchion position of the formwork support, so as to fix the upright stanchion of the frame body to prevent the upright stanchion from slipping;
(3) Welding a fixture channel steel on the steel cantilever beam to enable the fixture channel steel to be effectively connected with the steel cantilever beam, wherein the specification of the fixture channel steel is 10#, the length of the fixture channel steel is 4/5 of the height of the frame beam, the clear distance of the fixture channel steel is 10mm more than the width of the beam, a drill hole in the fixture is matched with a preformed hole in the frame beam, and the fixture channel steel is clamped on the frame beam when the steel cantilever beam is installed;
(4) A phi 14 counter-pulling screw rod penetrates through the fixture and the frame beam and is tightly fixed to enable the fixture and the frame beam to be integrated; the holes penetrating through the split screws on the beam web are the split screw holes of the template during concrete pouring, and are considered together during template lofting.
In this embodiment, the specific steps of building the formwork support frame are as follows:
(1) Two rows of upright posts are respectively erected on two sides of the bottom of the frame beam, the distance between the bottom support upright posts and the beam side is 50mm, and the width of the frame body is 1050mm;
(2) The upright stanchion is sleeved on the X25 steel bar head to keep stability and prevent the upright stanchion from sliding; in order to ensure that the I-steel is uniformly stressed, the left and right upright posts of the I-steel are erected at the same time, the butt joint pieces on the upright posts are arranged in a staggered manner, the joints of two adjacent upright posts are not arranged in a synchronous manner, and the staggered distance of two separated joints of one upright post in the height direction is not less than 500mm;
(3) Erecting a longitudinal and transverse floor sweeping rod by a scaffold, wherein the longitudinal floor sweeping rod is arranged on a vertical rod at 200-200 parts of the upper plane of the cantilever beam, and the transverse floor sweeping rod is arranged below the longitudinal floor sweeping rod and is fixed on the vertical rod by a right-angle fastener;
(4) The small cross bar is exposed out of the upright stanchion by 100mm and is arranged within a range of 100mm away from the upright stanchion, and cannot be randomly dismantled; the transverse horizontal rods are firmly fixed on the longitudinal horizontal rods by using two right-angle fasteners; the small cross bars of the operation layer are arranged at equal intervals according to the requirement of the scaffold board, and the maximum interval is not more than 1/2 of the longitudinal distance;
(5) The step pitch of the support frame is 1500mm, the first large cross bar is 100mm away from the outrigger, the first large cross bar is arranged at the inner side of the upright stanchion and is fixed on the upright stanchion by a right-angle fastener; the other small cross bars are positioned on the large cross bar, the large cross bar is used as a support of the small cross bar, and the small cross bars are firmly connected by a right-angle fastener; the height difference between two spaced butt-joint fasteners of the synchronous vertical rods is not smaller than 500mm;
(6) The formwork support system is required to be connected with the frame columns through wall attachment so as to ensure the integral stability of the support body;
(7) The transverse height-width ratio of the girder supporting frame is more than or equal to 6, and an integral horizontal cross brace is arranged; the horizontal scissor supports are arranged at the bottom, the middle part and the top of the support frame;
(8) Two longitudinal cross braces are arranged at two ends of the outward vertical rods of each span beam formwork support, and the longitudinal cross braces are in three-step five-span through height.
In this embodiment, the specific steps of the rack body dismantling are as follows:
(1) Before dismantling, cleaning all suspended matters and barriers on the frame body, and ensuring that the cleaned objects cannot be overturned and thrown to the ground in the cleaning process; each node and the supporting piece of the frame body are carefully checked, and the reinforcement and the supplement for the unqualified nodes are improved; dismantling is carried out according to the principle of dismantling after assembling and dismantling before assembling; carrying out system safety technology exchange on operators participating in dismantling;
(2) The working procedures during the dismantling operation are that a safety net, a body protecting railing, a skirting board, a group of upper scissors braces, a large cross bar, a small cross bar, a vertical rod and a cantilever frame are arranged in sequence;
(3) During dismantling, the operation must be carried out layer by layer according to the regulation, and the discrete surface dismantling or the stepping dismantling is not allowed; all the cross braces must be removed synchronously with the removal of the scaffold, and the removal is not performed in advance;
(4) After each shift of work, the remained frame body must be checked, and the unstable part can be removed after being reinforced; the removed materials can not be thrown downwards randomly and are conveyed to the ground in an organized way for sorting and stacking; each person participating in the operation must strictly comply with the operating regulations, and the safety belt must be correctly used and the safety helmet must be worn according to the regulations during the operation;
(5) A warning area is arranged on the demolition site, and a specially-assigned person is responsible for warning work; stopping all construction in the dismantling area, and entering the area for operation after the outer frame is dismantled; the dismantling work is directed by the scaffolders or the scaffolders who are on duty on their warrants.
The invention has the beneficial effects that: the plate frame structure is a technology frequently used in building engineering, the defects of a traditional elevated formwork supporting method are overcome, various problems existing in the traditional elevated formwork supporting method are avoided one by one, the novel technology is organically combined in the aspects of bearing, operation, safety protection systems and the like, so that the novel technology is integrated, especially, the risk coefficient becomes smaller and smaller, corresponding innovation is performed on the method, the structural type construction technology research is performed on the novel technology, the improvement and the improvement of the construction technology are promoted to have good practical significance, the elevated formwork supporting method for the whole hall is changed into a layered separated formwork supporting method, the change of the method promotes the construction convenience degree greatly, the structure becomes lighter and more delicate, the safety risk is greatly reduced, the requirements of safe construction of modern building enterprises are met, the requirements of efficiency improvement and income creation of the related enterprises are met, and the method has a wide market prospect.
Drawings
FIG. 1 is a schematic diagram of the installation and fixation of the steel cantilever beam of the present invention.
List of reference numbers:
1-I-steel, 2-channel steel, 3-short steel bars, 4-split screws and 5-frame beams.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.
The application engineering structure form plate-free frame structure has the advantages that the total height of a building is 43.00m, seven layers are arranged on the ground, the first layer structure is 4.5m in elevation, the second layer structure is 10.0m in elevation, the third layer structure is 18.5m in elevation, the fourth layer structure is 26.5m in elevation, the fifth layer structure is 31.5m in elevation, the sixth layer structure is 37.5m in elevation, and the seventh layer structure is 43.0m in elevation. The safety level of the main structure is two levels, and the reasonable service life of the structure is 50 years. The building earthquake fortification category is class B, and the structural earthquake-proof frame is of the second level. The phenol acetone unit had an axial length of 160.000m and an axial width of 23.000m.
A frame beam with a beam section exceeding 0.45m2, a formwork height of 4.8m, KL1-700 x 900, KL3-500 x 1100;
the section of the two-layer beam exceeds 0.45m2 of the frame beam. The height of the frame beam formwork exceeding 0.45m2 is 10.3m, KL 3-650X 1200, KL 5-700X 1300, KL 6-600X 1100, KL 2-500X 1200, L6-550X 1100, L8-1200X 800;
the frame beam with three-layer beam section exceeding 0.45m2 has template support height of 8.5m, L1-700X 1300, L2-700X 1400, KL1-500X 1100, KL2-500X 1200, KL3-500X 1300, KL5-550X 1100.
The four-layer frame beam with the beam section exceeding 0.45m2 has the template support height of 8.0m, L1-700 x 1400, L2-700 x 1500, KL1-500 x 1200, KL2-600 x 1200 and KL3-750 x 1700.
6. The seven-layer beam section exceeds the frame beam of 0.45m2 and the supporting formwork height exceeds the beam of 8 m. Wherein, the elevation of the six-layer structure is 37.5m, the length of the A4-A5 shaft/AA-AB shaft line is 10m, and the width of the shaft line is 9m; the length of the A2-A3 shaft/AA-AC shaft line at the position with the elevation of 42.7m of the seven-layer structure is 20m, and the width of the shaft line is 9m. The lower parts of the two areas are not provided with structural layer beam plates, the two areas are subjected to formwork supporting construction by adopting a section steel placing method, 400-type H-shaped steel is placed on the structural layer at the lower part of the two areas, and the bottom of the section steel and a frame body of a supporting system are supported and supported firmly by adopting a U-shaped support.
And in the process of formwork supporting construction and concrete pouring of each layer, the formwork support systems in the two-layer range at the lower part of the support layer of each layer cannot be detached. The cross-sectional dimension of the frame column is 1200mm multiplied by 1200mm, and the frame column template is surrounded by a steel pipe and is fixedly connected with the frame body, so that the stability of the frame body is ensured.
The construction method of the large-span slab-free frame beam is characterized by sequentially comprising the following steps of: measuring and paying off, erecting an overhanging scaffold, erecting a bearing scaffold, constructing a template, constructing reinforcing steel bars, pre-embedding PVC (polyvinyl chloride), constructing an embedded part, checking and accepting, simultaneously pouring concrete on a top beam, a top plate and a frame column, dismantling the template, curing the concrete, dismantling a bearing frame and dismantling the overhanging scaffold.
In this embodiment, the construction order that the scaffold of encorbelmenting set up does in proper order: the method comprises the steps of preparation before construction, steel cantilever beams, wall-penetrating screws, PVC sleeve processing, steel cantilever beam installation, formwork erection, frame body safety protection, main structure construction and frame body dismantling.
In this embodiment, the preparation before construction specifically includes: firstly, determining the number of steel outrigger setting layers according to the design size, reinforcement arrangement, schedule and layer height of a frame beam, arranging the steel outriggers along each layer of the frame beam from a 10m layer, wherein the distance lm is obtained, and manufacturing requirements can be met by selecting 14# I-steel through calculation; secondly, the instant bearing capacity of the frame beam needs to be rechecked, 15 days are needed for each layer after the construction of frame erection, steel bar construction, template installation, embedded part installation and the like is finished, the concrete strength is 80% of the designed bearing capacity at the moment, the lower-layer beam bottom supporting frame is not dismounted, the load born by the frame beam is less than 10% of the designed bearing capacity at the moment, and the structure safety can be met. According to the approved construction scheme, a material plan is listed, and practical materials and machines are arranged in advance.
The used material requirements are specifically as follows: the I-steel and channel steel materials and physical properties must meet the national requirements and are accompanied by material quality certificates and physical property certificates. The steel pipe adopts national standards, the surface of the steel pipe is flat and smooth, and the steel pipe does not have cracks, scars, layering, dislocation, hard bending, hair, hole marks and deep scribing, and the steel pipe is strictly prohibited from being punched. The fastener is made of malleable cast iron. The material of the fastener is in accordance with the regulations of the current national standard, namely steel pipe scaffold fasteners, and the quality of the fastener made of other materials can be used after the quality of the fastener is proved to be in accordance with the regulations of the standard through experiments.
In this embodiment, the manufacturing and installation of the steel outrigger specifically comprises:
(1) Processing an I-shaped steel cantilever beam according to the frame beam and the frame body width, wherein the length of the I-shaped steel cantilever beam is the sum of the frame body width, the size of the outer vertical rod from the steel beam end and the distance between the inner vertical rods of the frame beam bottom support;
(2) Welding 100mm of anti-slip steel bars with the height of 25mm and the diameter of 100mm on the steel cantilever beam corresponding to the upright stanchion of the formwork support to fix the upright stanchion of the formwork support so as to prevent the upright stanchion of the formwork support from slipping;
(3) Welding a fixture channel steel on the steel cantilever beam to enable the fixture channel steel to be effectively connected with the steel cantilever beam, wherein the specification of the fixture channel steel is 10#, the length of the fixture channel steel is 4/5 of the height of the frame beam, the clear distance of the fixture channel steel is 10mm more than the width of the beam, a drill hole in the fixture is matched with a preformed hole in the frame beam, and the fixture channel steel is clamped on the frame beam when the steel cantilever beam is installed;
(4) A phi 14 counter-pulling screw rod penetrates through the fixture and the frame beam and is fixed tightly, so that the fixture and the frame beam are integrated; the hole of the opposite-pulling screw rod penetrating through the beam web is the opposite-pulling screw rod hole of the template during concrete pouring, and the holes are considered together during template lofting.
In this embodiment, the specific steps of building the formwork support are as follows:
(1) Two rows of upright posts are respectively erected on two sides of the bottom of the frame beam, the distance between the bottom support upright posts and the beam side is 50mm, and the width of the frame body is 1050mm;
(2) The upright pole is sleeved on the X25 steel bar head to keep stability and prevent the upright pole from slipping; in order to ensure that the I-steel is uniformly stressed, the left and right upright posts of the I-steel are erected at the same time, the butt joint pieces on the upright posts are arranged in a staggered manner, the joints of two adjacent upright posts are not arranged in a synchronous manner, and the staggered distance of two separated joints of one upright post in the height direction is not less than 500mm;
(3) Erecting a longitudinal and transverse floor sweeping rod by a scaffold, wherein the longitudinal floor sweeping rod is arranged on a vertical rod at 200-200 parts of the upper plane of the cantilever beam, and the transverse floor sweeping rod is arranged below the longitudinal floor sweeping rod and is fixed on the vertical rod by a right-angle fastener;
(4) The small cross bar is exposed 100mm outside the upright stanchion, is arranged within a range of 100mm away from the upright stanchion, and cannot be freely disassembled; the transverse horizontal rods are firmly fixed on the longitudinal horizontal rods by using two right-angle fasteners; the small cross bars of the operation layer are arranged at equal intervals according to the requirement of the scaffold board, and the maximum interval is not more than 1/2 of the longitudinal distance;
(5) The step pitch of the support frame is 1500mm, the first large cross bar is 100mm away from the outrigger, the first large cross bar is arranged at the inner side of the upright rod and is fixed on the upright rod by a right-angle fastener; the other small cross bars are positioned on the large cross bar, the large cross bar is used as a support of the small cross bar, and the small cross bars are firmly connected by a right-angle fastener; the height difference between two spaced butt-joint fasteners of the synchronous vertical rods is not smaller than 500mm;
(6) The formwork support system is connected with the frame columns in a wall-attaching mode so as to ensure the overall stability of the support body;
(7) The transverse height-width ratio of the girder support frame is more than or equal to 6, and an integral horizontal cross brace is arranged; the horizontal scissor supports are arranged at the bottom, the middle part and the top of the support frame;
(8) Two longitudinal cross braces are arranged at two ends of the outward vertical rods of each span beam formwork support, and the longitudinal cross braces are in three-step five-span through height.
In this embodiment, the specific steps of the rack body dismantling are as follows:
(1) Removing all suspended matters and obstacles on the cleaning frame body before removing the cleaning frame body, and ensuring that the cleaned objects cannot be overturned and thrown to the ground in the cleaning process; each node and supporting piece of the frame body are carefully checked, and the undesirable reinforcing and supplementing effects are improved; dismantling is carried out according to the principle of dismantling after assembling and dismantling before assembling; carrying out system safety technology exchange on operators participating in dismantling;
(2) The working procedures during the dismantling operation are that a safety net, a body protecting railing, a skirting board, a group of upper scissors braces, a large cross bar, a small cross bar, a vertical rod and a cantilever frame are arranged in sequence;
(3) During dismantling, the operation must be carried out layer by layer according to the regulation, and the discrete surface dismantling or the stepping dismantling is not allowed; all the cross braces are required to be synchronously detached along with the detachment of the scaffold, and are not required to be detached in advance;
(4) After each shift of work, the remained frame body must be checked, and the unstable part can be removed after being reinforced; the detached materials can not be thrown downwards at will and are conveyed to the ground in an organized manner for sorting and stacking; each person participating in the operation must strictly follow the operating regulations, and the safety belt must be correctly used and the safety helmet is worn according to the regulations during the operation;
(5) A warning area is arranged on the demolition site, and a specially-assigned person is responsible for warning work; stopping all construction in the dismantling area, and entering the area for operation after the outer frame is dismantled; the dismantling work is directed by the scaffolders or the scaffolders who are on duty on their warrants.
The plate frame structure is a technology frequently used in building engineering, the defects of a traditional elevated formwork supporting method are overcome, various problems existing in the traditional elevated formwork supporting method are avoided one by one, the novel technology is organically combined in the aspects of bearing, operation, safety protection systems and the like, so that the novel technology is integrated, especially, the risk coefficient becomes smaller and smaller, corresponding innovation is performed on the method, the structural type construction technology research is performed on the novel technology, the improvement and the improvement of the construction technology are promoted to have good practical significance, the elevated formwork supporting method for the whole hall is changed into a layered separated formwork supporting method, the change of the method promotes the construction convenience degree greatly, the structure becomes lighter and more delicate, the safety risk is greatly reduced, the requirements of safe construction of modern building enterprises are met, the requirements of efficiency improvement and income creation of the related enterprises are met, and the method has a wide market prospect.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that modifications and adaptations can be made by those skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (6)
1. The construction method of the large-span slab-free frame beam is characterized by sequentially comprising the following steps of: measuring and paying off, erecting a cantilever scaffold, erecting a bearing scaffold, constructing a template, constructing a steel bar, pre-embedding PVC (polyvinyl chloride), constructing an embedded part, checking and accepting, simultaneously pouring concrete on a top beam, a top plate and a frame column, dismantling the template, curing the concrete, dismantling a bearing frame and dismantling the cantilever scaffold.
2. The method for constructing the large-span slab-free frame beam according to claim 1, wherein the construction sequence of the erection of the cantilever scaffold is as follows in sequence: the method comprises the steps of preparation before construction, steel cantilever beams, wall-penetrating screws, PVC sleeve processing, steel cantilever beam installation, formwork erection, frame body safety protection, main structure construction and frame body dismantling.
3. The method for constructing the large-span slab-free frame beam according to claim 2, wherein the preparation before construction is specifically: firstly, determining the number of steel outrigger arrangement layers according to the design size, reinforcement arrangement, progress plan and layer height of a frame beam, arranging the steel outriggers along each layer of the frame beam from a 10m layer, wherein the distance lm is formed, and 14# I-steel is selected by calculation to meet the requirements for manufacturing, specifically adopting the 14# I-steel as the steel outriggers, welding 10# channel steel clamping plates close to two sides of the frame beam for fixing the steel outriggers and ensuring that a support frame is fixed firmly; second, the immediate load capacity of the frame beam needs to be rechecked.
4. The construction method of the large-span slab-free frame beam according to claim 2, wherein the manufacturing and installation of the steel outriggers are specifically as follows:
(1) Processing I-steel outriggers according to the width of the frame beam and the frame body, wherein the length of the I-steel outriggers is the sum of the width of the frame body, the size of the outer vertical rod from the end of the steel beam and the distance between the inner vertical rods of the frame beam bottom support;
(2) Welding 100mm high-diameter 25mm anti-slip steel bars on the steel cantilever beam corresponding to the upright stanchion position of the formwork support, so as to fix the upright stanchion of the frame body to prevent the upright stanchion from slipping;
(3) Welding a fixture channel steel on the steel outrigger to enable the fixture channel steel to be effectively connected with the steel outrigger, wherein the specification of the fixture channel steel is 10#, the length of the fixture channel steel is 4/5 of the height of the frame beam, the clear distance of the fixture channel steel is 10mm more than the width of the frame beam, a drill hole on the fixture is matched with a preformed hole on the frame beam, and the fixture channel steel is clamped on the frame beam when the steel outrigger is installed;
(4) A phi 14 counter-pulling screw rod penetrates through the fixture and the frame beam and is fixed tightly, so that the fixture and the frame beam are integrated; the holes penetrating through the split screws on the beam web are the split screw holes of the template during concrete pouring, and are considered together during template lofting.
5. The method for constructing the large-span slab-free frame girder according to claim 2, wherein the concrete steps of erecting the formwork support frame are as follows:
(1) Two rows of upright posts are respectively erected on two sides of the beam bottom of the frame, the distance between the beam bottom supporting upright posts and the beam edge is 50mm, and the width of the frame body is 1050mm;
(2) The upright pole is sleeved on the X25 steel bar head to keep stability and prevent the upright pole from slipping; in order to ensure that the I-steel is uniformly stressed, left and right upright posts of the I-steel are erected simultaneously, the butt joint pieces on the upright posts are arranged in a staggered manner, the joints of two adjacent upright posts are not arranged in a synchronous manner, and the staggered distance of two separated joints of one upright post in the height direction is not less than 500mm;
(3) Erecting a longitudinal and transverse floor sweeping rod by a scaffold, wherein the longitudinal floor sweeping rod is arranged on a vertical rod at 200-200 parts of the upper plane of the cantilever beam, and the transverse floor sweeping rod is arranged below the longitudinal floor sweeping rod and is fixed on the vertical rod by a right-angle fastener;
(4) The small cross bar is exposed 100mm outside the upright stanchion, is arranged within a range of 100mm away from the upright stanchion, and cannot be freely disassembled; the transverse horizontal rods are firmly fixed on the longitudinal horizontal rods by using two right-angle fasteners; the small cross rods of the operation layer are arranged at equal intervals according to the requirements of the scaffold boards, and the maximum interval is not more than 1/2 of the longitudinal distance;
(5) The step pitch of the support frame is 1500mm, the first large cross bar is 100mm away from the outrigger, the first large cross bar is arranged at the inner side of the upright stanchion and is fixed on the upright stanchion by a right-angle fastener; the other small cross bars are positioned on the large cross bar, the large cross bar is used as a support of the small cross bar, and the small cross bars are firmly connected by a right-angle fastener; the height difference of two spaced butt-joint fasteners of the synchronous vertical rod is not smaller than 500mm;
(6) The formwork support system is connected with the frame columns in a wall-attaching mode so as to ensure the overall stability of the support body;
(7) The transverse height-width ratio of the girder supporting frame is more than or equal to 6, and an integral horizontal cross brace is arranged; the horizontal cross braces are arranged at the bottom, the middle part and the top of the support frame;
(8) Two longitudinal cross braces are arranged at two ends of the outward vertical rods of each span beam formwork support, and the longitudinal cross braces are in three-step five-span through height.
6. The method for constructing the large-span slab-free frame beam according to claim 2, wherein the specific steps of dismantling the frame body are as follows:
(1) Before dismantling, cleaning all suspended matters and barriers on the frame body, and ensuring that the cleaned objects cannot be overturned and thrown to the ground in the cleaning process; each node and supporting piece of the frame body are carefully checked, and the unsatisfactory reinforcement and supplement are completed; dismantling is carried out according to the principle of dismantling after assembling and dismantling before assembling; carrying out systematic safety technical background for operators participating in dismantling;
(2) The working procedures during the dismantling operation are that a safety net, a body protecting railing, a skirting board, a group of upper scissors braces, a large cross bar, a small cross bar, a vertical rod and a cantilever frame are arranged in sequence;
(3) During dismantling, the operation must be carried out layer by layer according to the regulation, and the discrete surface dismantling or the stepping dismantling is not allowed; all the cross braces are required to be synchronously detached along with the detachment of the scaffold, and are not required to be detached in advance;
(4) After each work, the remained frame body needs to be checked, and the unstable part can leave after being reinforced; the detached materials can not be thrown downwards at will and are conveyed to the ground in an organized manner for sorting and stacking; each person participating in the operation must strictly comply with the operating regulations, and the safety belt must be correctly used and the safety helmet must be worn according to the regulations during the operation;
(5) A warning area is arranged on the demolition site, and a specially-assigned person is responsible for warning work; stopping all construction in the dismantling area, and entering the area for operation after the outer frame is dismantled; the dismantling work is directed by the scaffolders or the scaffolders who are on duty on their warrants.
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| CN202211407448.6A CN115788033A (en) | 2022-11-10 | 2022-11-10 | Construction method of large-span slab-free frame beam |
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| CN202211407448.6A CN115788033A (en) | 2022-11-10 | 2022-11-10 | Construction method of large-span slab-free frame beam |
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