CN110348142B - Method for forming curve bridge based on BIM combined template support process - Google Patents
Method for forming curve bridge based on BIM combined template support process Download PDFInfo
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Abstract
The invention discloses a method for forming a curved bridge by adopting a combined template support process of a customized arc-shaped steel pipe and a flexible template based on BIM, which comprises the steps of modeling, blanking, coding, splicing and brushing mold oil based on BIM. Based on the application of the BIM technology, the invention reduces the waste of steel pipes in the manufacturing process of the arc-shaped steel pipes, improves the manufacturing accuracy of the radian of each steel pipe, and has the advantages of simple operation procedure, obvious construction period shortening, engineering cost reduction, high construction speed, wide application range and the like.
Description
Technical Field
The invention relates to a method for forming a curved bridge by a combined template support process based on BIM (building information modeling), in particular to a method for forming a curved bridge by a combined template support process of a customized arc-shaped steel pipe and a flexible template based on BIM.
Background
With the progress of urbanization roads and the continuous improvement of beauty of people, the plane form of the bridge is continuously updated. The plane modeling of the auxiliary bridge of many projects is a curve, and is provided with an upper slope and a lower slope, the radius of the corner of the wing plate is very small, the practical meaning of the wood template is not existed, and the curve modeling of the common wood template is impossible.
The remaining forms of the template only comprise two forms of a steel template and a bamboo plywood. The technology of making the curved bridge by the bridge steel template is mature, the difficulty of later construction is correspondingly reduced as long as the template is formed according to the curve of the bridge, but the steel template has no value of recycling, and the economic and social benefits are small.
Disclosure of Invention
In order to solve the problem of complex lines in the existing engineering, the invention provides a method for molding a curved bridge by adopting a combined template support process of customizing an arc-shaped steel pipe and a flexible template based on BIM (building information modeling), which combines with BIM technology to customize the combined template support process of the arc-shaped steel pipe and the flexible template to pour and mold.
The invention can be solved by the following technical scheme:
a method for forming a curved bridge based on a combined template support process for BIM comprises the following steps:
1) And (3) calculating: calculating and determining the distance between the supporting structures according to the self weight of the bridge structure and the weight of the supporting system;
2) Modeling: according to the calculated actual distance, building a bridge on a computer based on the BIM technology for forming, and combining the bridge
Simulating the sizes of the formwork support frame and the formwork according to the special curve and the special construction scheme of the formwork support frame;
3) Blanking: the arc steel pipe is picked out by combining the position of the arc steel pipe in the BIM model, and the arc steel pipe is determined
The required arc-shaped steel pipe is blanked according to the arc radius and the arc length;
4) And (3) encoding: according to the pulling-out position of the arc-shaped steel pipe in the BIM model and the position of the arc-shaped steel pipe
Numbering;
5) Splicing the molds: according to the numbered arc-shaped steel pipes, the numbers of the arc-shaped steel pipes which are already coded in the BIM model are combined,
the construction of the on-site bridge supporting system is carried out, so that the bridge curve has better effect after the concrete pouring is finished, and the bridge curve can be arranged in a large area
Before pouring, the bamboo plywood templates are spliced, line measurement is carried out, and the bamboo plywood templates are compounded with lines of the BIM model;
6) Brushing the mold oil: and after the bamboo plywood templates are assembled, brushing mold oil for later use.
The erection of the on-site bridge support system in the step 5) comprises the steps of adopting bowl buckle type supports, arranging support upright rods at the longitudinal and transverse intervals of 90cm, and arranging cross rod steps at 120cm; the height of the upper end of the vertical rod extending out of the top horizontal rod is controlled to be 60cm, double steel pipes with the thickness of 48 multiplied by 3.5mm are longitudinally arranged on the top support to serve as main ridges, the height of the adjustable top support is adjusted to enable the main ridges to be stressed evenly, the arc-shaped steel pipes are transversely arranged on the main ridges, the distance between the arc-shaped steel pipes and the vertical rod is kept consistent, 10 multiplied by 10cm square wood is paved above the arc-shaped steel pipes to serve as a secondary corrugated board, the distance between the arc-shaped steel pipes is 30cm, and the thickness of the bamboo plywood is 15mm.
And after the bamboo plywood formwork is assembled, performing form molding, rechecking measurement and mounting of a bottom die and a side die.
After the bottom die is installed and before the box girder is poured, the support is weighted according to the design requirement and 100% of the self weight of the poured concrete so as to check the bearing capacity of the support.
And after the side die is installed, sequentially carrying out first steel bar installation, inner die installation, first concrete pouring, top plate template and steel bar installation, second concrete pouring, template dismantling and frame unloading.
The roof template adopts steel pipe support as the support, and the roof adopts and adopts 10 x 10cm thick square timber as the stiffening plate, and the panel adopts ordinary plywood, and thickness 15mm reserves constructor hole during the roof installation, and the size in every constructor hole is 120 x 100cm.
And measuring the pre-embedded steel bar heads before the top plate is poured in the second concrete pouring, ensuring the thickness and the gradient of the top plate according to the designed elevation, setting four longitudinal elevation belts in the whole construction of the top plate, laying a central line point elevation belt on the top plate according to the distance 5m of the central line of the line, laying 5 rows of elevation control points on a reference line according to the distance 1m, and welding 15cm steel bars with the top plate steel bars in advance at each point, wherein the length diameter of each steel bar is 16.
Wherein, the time for dismantling the template and the frame is 12 hours when the compressive strength of the concrete reaches 2.5 Mpa; the dismounting of the bearing templates such as the bottom die, the wing plate and the like is determined according to the concrete strength, the concrete strength during dismounting is more than 90% of the design value, and the age of the concrete is not less than 7 days.
Wherein, the basic sequence of the template removal is as follows: the difference between the surface temperature of the beam body and the environment temperature is not more than 15 ℃ when the mold is removed, the mold is not removed when the temperature changes sharply, and the surface and edges of the concrete are not damaged when the mold is removed.
Advantageous effects
1. Based on the application of the BIM technology, the steel pipe waste in the arc-shaped steel pipe manufacturing process is reduced, and the manufacturing accuracy of each steel pipe radian is improved.
2. The flexible template has strong applicability in a plane curve bridge, high repeated utilization rate, firm design by combining with an arc-shaped steel pipe, flexible and quick assembly, firm reinforcement, attractive and smooth linear shape and capability of ensuring the appearance quality of bridge concrete.
3. The process overcomes the defects that the traditional steel mould of the plane curve bridge is complex to disassemble and assemble, and one set of template can be used only once.
4. The method has the advantages of simple operation procedure, remarkable shortening of the construction period, reduction of the engineering cost and guarantee of the engineering quality.
5. Simple process, economy, reliability, simple operation, high construction speed and wide application range.
Drawings
FIG. 1 is a schematic view of the structure of a customized arc-shaped steel pipe of the present invention
FIG. 2 is a schematic view of a curved bridge structure according to the present invention
FIG. 3 is a BIM model schematic diagram of the curve bridge supporting system of the present invention
FIG. 4 is a BIM model schematic diagram of the position of the curved steel pipe supported by the curved bridge
FIG. 5 is a schematic view showing the dimensions of the arc-shaped steel pipe of the present invention
FIG. 6 is a construction flow chart of the present invention
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification.
A method for forming a curved bridge (shown as a structural schematic diagram of the curved bridge in the invention in figure 2) based on a combined template support process for BIM comprises the following steps:
1) And (3) calculating: calculating and determining the distance between the supporting structures according to the self weight of the bridge structure and the weight of the supporting system;
2) Modeling: according to the calculated actual distance, building a bridge on a computer based on the BIM technology for forming, and combining the bridge
The sizes of the special curve and the special construction scheme of the formwork support are shown in figure 3;
3) Blanking: combining the position of the arc-shaped steel pipe in the BIM model as the arc-shaped steel pipe in the figure 4, the arc-shaped steel pipe is taken out
Referring to fig. 5, determining the size (arc radius and arc length) of the arc-shaped steel pipe, and blanking the needed arc-shaped steel pipe;
4) And (3) encoding: according to the drawing position of the arc-shaped steel pipe in the BIM model, as shown in figure 4, according to the position of the arc-shaped steel pipe
Numbering;
5) Splicing the mould: according to the numbered arc-shaped steel pipes, the numbers of the arc-shaped steel pipes which are already coded in the BIM model are combined,
the bridge supporting system is erected on site, so that the bridge curve has good effect after concrete pouring is finished, and the bridge supporting system can be used for large area
Before pouring, the bamboo plywood templates are spliced, line measurement is carried out, and the bamboo plywood templates are compounded with BIM model lines;
6) Brushing mold release oil: and after the bamboo plywood templates are assembled, brushing mold oil for later use.
As shown in fig. 3, 4 and 6, the construction sequence by the present invention includes:
1. paying off: lofting according to the coordinates of the central axis and the side line of the beam slab;
2. and (3) erecting a bracket, namely adopting a bowl buckle type bracket, arranging vertical and horizontal intervals of bracket upright rods according to 90cm (thickened sections are arranged in the range of 7m close to a buttress web, arranging vertical encrypted bracket upright rods according to 60 cm), and setting the step distance of cross rods to be 120cm. The height of the upper end of the vertical rod, which extends out of the top horizontal rod, is controlled to be 60cm, the double steel pipes with the thickness of 48 multiplied by 3.5mm are longitudinally arranged on the jacking to serve as main ridges, the height of the adjustable jacking is adjusted to enable the main ridges to be stressed evenly, customized arc-shaped steel pipes (shown in figure 1) are transversely arranged on the main ridges, the distance is kept consistent with that of the vertical rod, 10 multiplied by 10cm square timbers are paved above the arc-shaped steel pipes to serve as secondary corrugated ribs, the distance is 30cm, and bamboo plywood with the thickness of 15mm is paved on the secondary corrugated ribs;
3. checking and measuring after the template is formed to check whether the formed template system meets the pouring requirement;
4. support prepressing
In order to ensure the perfect and smooth line shape of the beam body, after the support and the bottom die are installed and before the box beam is poured, the support is weighted according to 100% of the dead weight of the poured concrete according to design requirements so as to check the bearing capacity of the support; reducing and eliminating inelastic deformation of the stent system; the phenomenon that the beam body cracks due to support settlement of box beam concrete is avoided;
5. side form mounting
When the side mould is installed, the side mould is aligned with the relative position of the bottom mould, and after the verticality of the side mould is adjusted by the jacking, the side mould is well connected with the end mould. The lower edge of the side mold is closely attached to the joint of the bottom mold, and the joint is lined with double-sided adhesive to prevent slurry leakage. After the side mold is installed, the side mold is fastened by using a steel pipe support according to the design, and the length, width, height, line shape and the like of the whole template are checked. The size of the cross section and the linear appearance quality of the support are adjusted and perfected. Uniformly brushing a release agent;
6. first installation of reinforcing bars
The first cast-in-place box girder steel bar installation is divided into two times, and a web plate and a bottom plate steel bar are installed firstly. And the web plate reinforcing steel bars for mounting the top plate reinforcing steel bars are composed of frameworks. The web plate framework and the middle cross beam framework are manufactured by adopting a mold in a prefabrication factory;
7. internal mold mounting
After the inner mold is assembled into a whole according to the design size, the sizes of all parts are checked, and the joints are uniformly treated by using double faced adhesive tapes to prevent slurry leakage. Uniformly coating a release agent, and supporting and reinforcing by using a steel pipe scaffold;
8. pouring concrete for the first time;
9. roof template and reinforcing bar installation
And after the first pouring is finished, treating the slurry leakage at the construction joint in time and washing the slurry completely. And on the third day, the diaphragm beam construction joints of the webs can be roughened and washed clean. And after the top plate formwork is installed, the top plate formwork adopts a steel pipe support as a support, the top plate adopts square wood with the thickness of 10 multiplied by 10cm as a stiffening plate, and the panel adopts common plywood with the thickness of 15mm. When the top plate is installed, construction man holes are reserved, and the size of each construction man hole is 120 x 100cm;
two constructor holes are arranged every span of each box room. Binding the top plate and the wing plate steel bars after the top plate is installed, pre-burying the anti-collision guardrail steel bars and the pavement layer steel bars after the steel bars are installed, wherein the pre-buried steel bars meet the specification requirements;
10. second concrete pouring
Elevation control: the embedded steel bar heads are measured before the top plate pouring construction, and the thickness and the gradient of the top plate are ensured according to the designed elevation. Four longitudinal elevation belts are set in the full-width construction of the top plate, so that a center line point elevation belt is arranged on the top plate according to the distance of 5m of the central line of the line, 5 rows of elevation control points are arranged on the datum line according to the distance of 1m, and each point is welded with a reinforcing steel bar of the top plate in advance, wherein the length of each point is 15cm, and the diameter of each reinforcing steel bar is 16. After the concrete is vibrated, the concrete is roughly flattened manually, then is rolled for a plurality of times by a roller, is flattened by an aluminum alloy scraper, and is brushed by a bamboo broom after being flattened. In the concrete pouring process, a specially-assigned person is dispatched to see the formwork, the bracket and the reinforcing steel bar, and once the formwork leaks and moves, the bracket has a different shape, the phenomena of reinforcing steel bar loosening and the like are timely processed. If the support has abnormal shape, the pouring is stopped immediately, and the pouring can be continued after the treatment. Arranging measuring personnel to observe the support settlement condition;
11. formwork removal and support removal
And (3) dismantling the template: the non-bearing templates at the outer side, the inner side and the end part are dismantled, and the strength of the concrete of the beam body can ensure that the surface and the edges and corners of the beam body are not damaged by dismantling the templates. When the compressive strength of the concrete reaches 2.5Mpa, the time is 12 hours according to the current air temperature; and (3) the dismounting of the bearing templates such as the bottom die, the wing plate and the like is determined according to the concrete strength, the concrete strength during the dismounting is more than 90% of the design value, and the age of the concrete is not less than 7 days. Thus, the basic sequence of formwork removal is: disassembling an end mould, an inner mould, an outer mould and a bottom mould. The difference between the surface temperature of the beam body and the environmental temperature is not more than 15 ℃ during the stripping, the beam body does not fall off the mould when the temperature changes rapidly, and the surface and edges of the concrete are not damaged during the stripping. After the template is detached, residual mortar on the surface and joints of the template is timely removed, a release agent is uniformly coated, and the template is ready for use after finishing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A method for forming a curved bridge based on a combined template support process for BIM is characterized by comprising the following steps:
1) And (3) calculating: calculating and determining the distance between the supporting structures according to the self weight of the bridge structure and the weight of the supporting system;
2) Modeling: building a bridge on a computer based on a BIM technology to form according to the calculated actual distance, and simulating the sizes of a formwork support and a formwork by combining a special bridge curve and a special construction scheme of the formwork support;
3) Blanking: the method comprises the following steps of taking out an arc-shaped steel pipe according to the position of the arc-shaped steel pipe in a BIM model, determining the arc radius and the arc length of the arc-shaped steel pipe, and blanking the needed arc-shaped steel pipe;
4) And (3) encoding: numbering according to the pulling-out position of the arc-shaped steel pipe in the BIM model and the position of the arc-shaped steel pipe;
5) Splicing the mould: according to the numbered arc-shaped steel pipes, the number of the arc-shaped steel pipes which are already numbered in the BIM model is combined, the erection of an on-site bridge supporting system is carried out, in order to enable the bridge curve to have good effect after concrete pouring is finished, before large-area pouring, bamboo plywood templates are firstly spliced, line measurement is carried out, and the bamboo plywood templates are compounded with the lines of the BIM model;
6) Brushing the mold oil: and after the bamboo plywood templates are assembled, brushing mold oil for later use.
2. The method according to claim 1, wherein the erection of the on-site bridge supporting system in the step 5) comprises adopting bowl-buckle type brackets, wherein the vertical and horizontal distances between the vertical rods of the brackets are all 90cm, and the step distance between the cross rods is 120cm; the height of the upper end of the vertical rod extending out of the top horizontal rod is controlled to be 60cm through an adjustable screw, double steel pipes with the thickness of 48 multiplied by 3.5mm are longitudinally arranged on the top support to serve as main ribs, the height of the adjustable top support is adjusted to enable the main ribs to be stressed evenly, the arched steel pipes are transversely arranged on the main ribs, the distance between the arched steel pipes and the vertical rod is kept consistent, 10 multiplied by 10cm square blocks are paved above the arched steel pipes to serve as secondary corrugated blocks, the distance between the secondary corrugated blocks is 30cm, and the thickness of the bamboo plywood is 15mm.
3. The method as claimed in claim 2, wherein the bamboo plywood formwork is assembled and then subjected to formwork forming, recheck measurement and bottom formwork and side formwork installation.
4. The method according to claim 3, wherein after the bottom die is installed and before the box girder is poured, the support is weighted according to the design requirement and 100% of the dead weight of the poured concrete so as to check the bearing capacity of the support.
5. The method of claim 3, wherein the side form installation is followed by a first rebar installation, an inner form installation, a first concrete pour, a top slab form and rebar installation, a second concrete pour, and form removal and destacking in sequence.
6. The method of claim 5, wherein the top plate formwork is supported by steel pipe supports, the top plate is stiffened by square timber of 10 x 10cm thickness, the face plate is made of ordinary plywood of 15mm thickness, and constructor holes are reserved for the top plate installation, each constructor hole being 120 x 100cm in size.
7. The method as claimed in claim 5, wherein the pre-embedded steel bar heads are measured before the top plate pouring construction in the second concrete pouring, the thickness and the gradient of the top plate are ensured according to the design elevation, four longitudinal elevation belts are considered in the whole top plate construction, a center line point elevation belt is arranged on the top plate according to the distance of 5m of the central line of the line, 5 rows of elevation control points are arranged on the reference line according to the distance of 1m, and each point is welded with the steel bar of the top plate in advance, wherein the length of each point is 15cm, and the diameter of each point is 16.
8. The method of claim 5, wherein the time for removing the form and the frame is 12 hours when the concrete compressive strength reaches 2.5 Mpa; the removal of the bottom mould and the wing plate bearing template is determined according to the concrete strength, the concrete strength during the removal is more than 90% of the design value, and the age of the concrete is not less than 7 days.
9. The method as claimed in claim 8, wherein the order of removing the formwork is to remove the end mould, the inner mould, the outer mould and the bottom mould, the difference between the surface temperature of the beam body and the ambient temperature is not more than 15 ℃ when the formwork is removed, the formwork is not removed when the air temperature changes sharply, and the surface and edges of the concrete are not damaged when the formwork is removed.
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