CN112084554A - Arc-shaped cantilever structure paying-off construction method - Google Patents
Arc-shaped cantilever structure paying-off construction method Download PDFInfo
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Abstract
The arc overhanging structure pay-off construction method is mainly used for pay-off, construction and control of arc overhanging structures at each position, and is characterized in that according to the actual conditions of engineering, safety checking calculation, CAD auxiliary coordinate control, BIM modeling, internal control of a vertical collimator and external control of a total station are carried out on a framework system through sample safety software, and a specially-assigned person carries out on-site inspection guidance to ensure the overall process control from bottom crossing, pay-off and construction of the arc overhanging structure, so that the construction quality of the arc overhanging structure is ensured. The invention can better control the arc structure from paying off, and can adjust and control according to the control point area during construction.
Description
Technical Field
The invention belongs to the field of civil buildings and production, and particularly relates to construction paying-off and lofting required by civil buildings and production.
Background
The arc overhanging structure is designed for attractive appearance and elegant appearance in more and more structures, a plumb bob is used for hanging wires according to on-site ground paying-off in the prior art, the horizontal height of workers directly influences the construction quality of the arc overhanging structure, and the accuracy and precision of paying-off can be better ensured by combining an internal control method and an external control method, so that the construction quality of arc overhanging is better ensured.
Disclosure of Invention
The invention mainly solves the problems of construction and production of arc-shaped structures, and mainly carries out safety checking calculation on a framework system according to sample safety calculation software, and can realize more accurate lofting of the arc-shaped overhanging structure by adopting CAD software, a laser plummet, a total station and modern BIM technology as supports, thereby ensuring the construction quality of the arc-shaped overhanging structure.
The technical scheme of the invention is as follows: a pay-off construction method for an arc cantilever structure is characterized in that sample safety calculation software is adopted to set up an on-site formwork to perform safety checking calculation, and the position and coordinate control of a control point, BIM modeling, internal control of a vertical collimator and external control of a total station are determined according to a CAD drawing.
The concrete construction process comprises the following steps: in the early stage, the arc overhanging structure is analyzed and relevant control point coordinates are read, the framework erection system is checked and calculated and BIM modeling is carried out, the framework erection system with the feasibility of the arc overhanging structure is determined, and the accuracy of lofting is ensured through the double control of the internal control point of the plummet and the external control point of the total station in the construction process.
1. Checking calculation in earlier stage
The steel pipe fastener type scaffold is adopted for erecting the scaffold body, the space between the scaffold bodies is 900 x 900, the step pitch is 1200, the top upright rod is less than or equal to 500mm, one horizontal cross brace is arranged every six spans in the longitudinal direction and the transverse direction, and one horizontal cross brace is arranged at the distance of 500 from the top layer.
2. BIM modeling
And building a die carrier by adopting BIM software to carry out three-dimensional BIM modeling, accurately determining the position of a control point combination beam of the arc cantilever structure by combining a CAD drawing and a BIM three-dimensional drawing, selecting the positions of an internal control point and an external control point which are both 500mm away from the arc cantilever structure on the outer side according to the drawing condition, wherein the distance between the control points is 3000 mm.
3. Internal control of vertical collimator
Confirm interior accuse point for 500mm apart from the arc structure outside of encorbelmenting, reserve the control point when the ground lofting, erect laser plummet at the ground control point department that has surveyed when waiting to be under construction to the arc structure of encorbelmenting, carry out control point collection, bullet line in the arc structure department of encorbelmenting.
4. Total station external control
The coordinates of the arc cantilever structure at a position 500mm away from the outer side are recorded and serve as an outer control point of the arc cantilever structure, a total station is erected on a structure top, a back intersection method is adopted, the coordinates of the control points of the arc cantilever structure are measured and set according to the coordinates of the ground control points, and then rechecking and adjustment are carried out on the positions of the inner control points, so that the accuracy of the arc cantilever structure is guaranteed.
According to the invention, sample safety calculation software is adopted to carry out die set checking calculation, accurate positions and coordinates of control points are determined by means of BIM (building information modeling) technology and CAD (computer aided design) assistance, and the internal control of a vertical collimator and the external control of a total station are combined, so that an arc-shaped structure is better controlled from paying off.
Drawings
FIG. 1 is BIM modeling of the present invention, wherein 1 is an arc cantilever structure, and 2 is a formwork system.
Fig. 2 determines the position and coordinates of the control point of the arc-shaped cantilever structure through CAD assistance.
Fig. 3 is a detailed view of the internal control point of the plumbing instrument.
Fig. 4 is a detailed view of an external control point using a total station.
In the figure, 1, the arc structure of encorbelmenting, 3, the appearance that hangs down, 4, the arc structure internal control point of encorbelmenting, 5, total powerstation, 6, the arc structure external control point of encorbelmenting.
Detailed Description
Example 1: in the paying-off construction method of the arc overhanging structure, sample safety calculation software is adopted to set up an on-site formwork for safety checking calculation, control point position and coordinate control, BIM modeling, internal control of a vertical collimator and external control of a total station are determined according to CAD drawings, and the control of the whole process from bottom intersection, paying-off to construction of the arc overhanging structure is ensured, so that the construction quality of the arc overhanging structure is ensured.
The concrete construction process comprises the following steps: in the early stage, the arc overhanging structure is analyzed and relevant control point coordinates are read, the framework erection system is checked and calculated and BIM modeling is carried out, the framework erection system with the feasibility of the arc overhanging structure is determined, and the accuracy of lofting is ensured through the double control of the internal control point of the plummet and the external control point of the total station in the construction process.
1. Checking calculation in earlier stage
According to the drawing structural form, a steel pipe fastener type scaffold is erected on a frame body, sample safety calculation software is adopted to perform safety checking calculation on the frame body arrangement, the determined distance is 900 x 900, the step pitch is 1200, the top vertical rod is less than or equal to 500mm, one horizontal cross brace is arranged every six spans in the longitudinal direction and the transverse direction, and one horizontal cross brace is arranged at the distance of 500 from the top layer.
2. BIM modeling
A technician builds a three-dimensional BIM model by adopting BIM software according to a tested and calculated mould frame system, and accurately determines the position of a control point combination beam of the arc cantilever structure by combining a CAD drawing and a BIM three-dimensional drawing.
3. Internal control of vertical collimator
Combining drawing and BIM three-dimension, determining that the inner control point is 500mm away from the outer side of the arc-shaped overhanging structure, reserving the control point during ground lofting, erecting a laser plummet at the measured ground control point when the construction is carried out to the arc-shaped overhanging structure, and collecting and snapping a control point at the arc-shaped overhanging structure.
4. Total station external control
The total station is erected on the structure top, a back intersection method is adopted, coordinates of control points of the arc cantilever structures are measured according to the coordinates of ground control points, and then rechecking and adjustment are carried out on the control points and the inner control points, so that the accuracy of the arc cantilever structures is guaranteed.
Claims (1)
1. The paying-off construction method of the arc cantilever structure is characterized by comprising the following steps of:
(1) the scaffold is built by adopting a steel pipe fastener type scaffold, the spacing between the scaffold bodies is 900 x 900, the step pitch is 1200, the vertical rod at the top is less than or equal to 500mm, one horizontal cross brace is arranged every six spans in the longitudinal direction and the transverse direction, and one horizontal cross brace is arranged at the distance of 500 from the top layer;
(2) building a die carrier by BIM software to carry out three-dimensional BIM modeling, accurately determining the position of a control point combination beam of the arc-shaped cantilever structure by combining a CAD drawing and a BIM three-dimensional drawing, selecting the positions of an internal control point and an external control point which are both 500mm away from the arc-shaped cantilever structure on the outer side according to the drawing condition, wherein the distance between the control points is 3000 mm;
(3) determining an inner control point 500mm away from the outer side of the arc-shaped overhanging structure, reserving the control point during ground lofting, erecting a laser plummet at the measured ground control point when the arc-shaped overhanging structure is constructed, and collecting and snapping a control point at the arc-shaped overhanging structure;
(4) the coordinates of the arc cantilever structure at a position 500mm away from the outer side are recorded and serve as an outer control point of the arc cantilever structure, a total station is erected on a structure top, a back intersection method is adopted, the coordinates of the control points of the arc cantilever structure are measured and set according to the coordinates of the ground control points, and then rechecking and adjustment are carried out on the positions of the inner control points, so that the accuracy of the arc cantilever structure is guaranteed.
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Effective date of registration: 20220816 Address after: No. 1 Donghuamen, Xinghualing District, Taiyuan City, Shanxi Province 030032 Applicant after: SHANXI SECOND CONSTRUCTION GROUP Co.,Ltd. Applicant after: SHANXI CONSTRUCTION INVESTMENT GROUP Co.,Ltd. Address before: 030032 5th floor, block B, building 1, No.8 Xinhua Road, Shanxi demonstration area, Taiyuan City, Shanxi Province Applicant before: SHANXI SECOND CONSTRUCTION GROUP Co.,Ltd. |
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