CN112727081B - Method for reinforcing oblique adjustable support of cantilever structure - Google Patents
Method for reinforcing oblique adjustable support of cantilever structure Download PDFInfo
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- CN112727081B CN112727081B CN202011561781.3A CN202011561781A CN112727081B CN 112727081 B CN112727081 B CN 112727081B CN 202011561781 A CN202011561781 A CN 202011561781A CN 112727081 B CN112727081 B CN 112727081B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
- E04G13/066—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall for overhangs
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Abstract
The invention discloses a method for reinforcing an oblique adjustable support of an overhanging structure, which comprises the following steps: firstly, determining an adjustable supporting and reinforcing structure; secondly, calculating the slant live load of the adjustable supporting and reinforcing structure; thirdly, determining a stable inclination angle of the adjusting support rod; fourthly, calculating the axial force load bearing interval of the inclined support of the adjusting support rod; fifthly, determining the length of the adjusting support rod; selecting basic parameters of the adjusting support rod and looking up a table to obtain the stability coefficient of the axis compression member of the adjusting support rod; seventhly, carrying out stability and compression resistance checking calculation on the adjusting support rod; eighthly, welding the vertical shaping plate and the non-vertical shaping plate; and ninthly, obliquely supporting and reinforcing the cantilever structure. The invention adopts the telescopic adjusting rod, can reduce the construction distance from the cornice to the frame body to the maximum extent, reduces the safety risk caused by roof cornice construction, ensures the strength and rigidity of the formwork at the cornice line part, ensures that the internal corner of the concrete is straight and the external corner is square, and reduces the appearance quality defect of the concrete.
Description
Technical Field
The invention belongs to the technical field of reinforcement of oblique adjustable supports of cantilever structures, and particularly relates to a reinforcement method of oblique adjustable supports of cantilever structures.
Background
The traditional mode of cantilever structure support reinforcement is formed by splicing loose templates, and the concrete appearance quality internal corners constructed by the loose templates and the cantilever frame bodies are not straight and have quality defects due to the fact that the external corners are not square. The bulk template often splices difficult control that targets in place, the negative and positive angle that leads to is damaged, concrete appearance quality is not good, for this reason now urgently needed a novel template support instrument suitable for the structure of encorbelmenting to and satisfy the method that the structure of encorbelmenting supported reinforcement stability and compression resistance requirement, ensure the intensity and the rigidity of cornice and eaves mouth lines position template, guarantee that concrete negative angle is straight in the same direction as, the positive angle is just, reduce concrete appearance quality defect, later stage repair work load has been reduced, engineering cost has been practiced thrift.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for supporting and reinforcing an overhanging structure in an obliquely adjustable manner, aiming at overcoming the defects in the prior art, and being capable of solving the problems of damaged internal and external corners and poor appearance quality of concrete caused by the fact that bulk templates cannot be spliced, and meanwhile, in the aspect of supporting of an overhanging frame body, a telescopic adjusting rod is adopted, so that the construction distance from a cornice to the frame body can be reduced to the maximum extent, the safety risk caused by roof cornice construction is reduced, the strength and rigidity of templates at cornice line parts are ensured, the internal corners of concrete are ensured to be straight, the external corners of concrete are ensured to be square, the defects of the appearance quality of concrete are reduced, and the method is convenient to popularize and use.
In order to solve the technical problems, the invention adopts the technical scheme that: the method for reinforcing the obliquely adjustable support of the cantilever structure is characterized by comprising the following steps of:
step one, determining an adjustable supporting and reinforcing structure: the adjustable supporting and reinforcing structure is used for carrying out oblique adjustable supporting on an external corner or an internal corner of an overhanging structure on the outer side of the building outer vertical wall;
the adjustable supporting and reinforcing structure comprises a hoop arranged on a scaffold upright rod positioned between the building outer vertical wall and the overhanging structure and an adjusting support rod hinged with the hoop, wherein a vertical shaping plate and a non-vertical shaping plate matched with an external corner or an internal corner of the overhanging structure are fixedly arranged at one end of the adjusting support rod away from the hoop;
the adjusting support rod comprises an outer pipe and an inner pipe, one end of the inner pipe extends into the outer pipe, external threads and an adjusting support nut matched with the external threads are arranged on the outer side of one end, matched with the inner pipe, of the outer pipe, two strip-shaped holes which are oppositely arranged are formed in the external thread section of the outer pipe, a plurality of pairs of limiting holes which are oppositely arranged are formed in the inner pipe along the length direction, the bolt penetrates through the strip-shaped holes and the pair of limiting holes to connect the outer pipe and the inner pipe, and the adjusting support nut is abutted to the bottom of the bolt;
step two, according to the formula Q ═ G + G1+G2+G3Calculating the slant live load Q of the adjustable supporting and reinforcing structure, wherein G is the self weight of the cantilever structure steel concrete, and G1Is the dead weight of the template G2For manually vibrating the load, G3The self-weight load of constructors and small machines and tools is achieved;
step three, determining and adjusting the stable inclination angle of the supporting rod: regarding an acute angle included angle between a central axis of the adjusting support rod and the vertical shaping plate as a stable inclination angle theta of the adjusting support rod, wherein the angle interval of the stable inclination angle theta of the adjusting support rod is 30-45 degrees;
step four, according to the formula
Calculating the load interval [ F ] of the inclined support bearing axial force of the adjusting support rodmin,Fmax]Wherein F isminMinimum value in interval of bearing axial force load for inclined support, FmaxThe maximum value of the interval for bearing the axial force load by the inclined support;
step five, determining the length of the adjusting supporting rod: determining the length interval of the adjusting support rod according to the angle interval of the stable inclination angle theta of the adjusting support rod and the position of the scaffold upright rod between the building outer upright wall and the overhanging structure;
step six, selecting basic parameters of the adjusting support rod and looking up a table to obtain the stability coefficient of the axis pressed component of the adjusting support rod: selecting basic parameters of an adjusting support rod, wherein the basic parameters of the adjusting support rod comprise the diameter, the thickness, the cross sectional area, the designed value of the compressive strength, the inertia moment of a section, the turning radius and the length coefficient of the section;
according to the formula
Calculating and adjusting slenderness ratio of supporting rod
Wherein mu is for adjusting the strutThe length coefficient, L is the length value of the adjusting support rod in the length interval, and i is the turning radius of the section of the adjusting support rod; inquiring a stability coefficient attached table of the d-type section axis pressed member in the steel structure design standard according to the slenderness ratio of the adjusting support rod to obtain the stability coefficient of the axis pressed member of the adjusting support rod;
step seven, according to the formula
Carrying out stability and compression resistance checking calculation on the adjusting support rod to obtain the actual compression resistance intensity value f of the adjusting support rod1N is the axial force load borne by the adjusting support rod, A is the cross section area of the adjusting support rod in the basic parameters of the adjusting support rod, and phi is the stability coefficient of the axial center pressed component corresponding to the basic parameters of the adjusting support rod;
the axial force load N borne by the adjusting support rod is made to be the maximum value F in the interval of bearing the axial force load by the inclined supportmax；
When f is1When the pressure is larger than or equal to f, the stability of the adjusting supporting rod and the actual compressive strength do not meet the requirements, basic parameters of the adjusting supporting rod are replaced, and the step five is executed;
when f is1If the pressure is less than f, adjusting the stability and the actual compressive strength of the supporting rod to meet the requirements, and executing the step eight;
wherein f is a designed value of the compressive strength of the adjusting support rod in the basic parameters of the adjusting support rod;
step eight, welding the vertical shaping plate and the non-vertical shaping plate: welding and shaping a vertical shaping plate and a non-vertical shaping plate of an external corner or an internal corner of the supporting cantilever structure at one end of the inner pipe, which is far away from the outer pipe;
when the overhanging structure is provided with an external corner, the vertical sizing plate is an external corner vertical sizing plate, the non-vertical sizing plate is an external corner horizontal sizing plate, and the external corner vertical sizing plate and the external corner horizontal sizing plate are welded at one end of the inner tube, which is far away from the outer tube, wherein an external corner sizing support template formed by the external corner vertical sizing plate and the external corner horizontal sizing plate is opened outwards, and the included angle between the central axis of the inner tube and the plane of the external corner vertical sizing plate is theta;
when the overhanging structure is an internal corner, the vertical shaping plate is an internal corner vertical shaping plate, the non-vertical shaping plate is an internal corner non-vertical shaping plate, and the internal corner vertical shaping plate and the internal corner non-vertical shaping plate are welded at one end of the inner tube, which is far away from the outer tube, wherein an opening of an internal corner shaping supporting template formed by the internal corner vertical shaping plate and the internal corner non-vertical shaping plate faces inwards, and an included angle formed by the central axis of the inner tube and the plane of the internal corner vertical shaping plate is theta;
step nine, the oblique support of the cantilever structure is reinforced: the adjusting support rod butt welded with the vertical shaping plate and the non-vertical shaping plate is arranged at the position of an external corner or an internal corner of the overhanging structure, the hoop is arranged on a scaffold upright rod between an external vertical wall of a building and the overhanging structure, the adjusting support rod is connected with the hoop through the hinged ear plates, and the external corner or the internal corner of the overhanging structure is obliquely supported and reinforced.
The method for reinforcing the cantilever structure by obliquely adjustable support is characterized by comprising the following steps of: a hinged lug plate is arranged on the side wall of the hoop, and one end of the outer pipe, which is far away from the adjusting support nut, is hinged with the hinged lug plate; the handle is installed to the regulation support nut outside.
The method for reinforcing the cantilever structure by obliquely adjustable support is characterized by comprising the following steps of: in the eighth step, the external corner vertical shaping plate and the external corner horizontal shaping plate are fixedly connected with one end, far away from the outer pipe, of the inner pipe through the external corner reinforcing rib plate;
the vertical shaping plate of reentrant corner and the non-vertical shaping plate of reentrant corner are all kept away from the one end fixed connection of outer tube through reentrant corner deep floor and inner tube.
The method for reinforcing the cantilever structure by obliquely adjustable support is characterized by comprising the following steps of: and a channel steel for shaping the water dripping line is arranged on the external corner horizontal shaping plate.
Compared with the prior art, the invention has the following advantages:
1. the adjustable supporting and reinforcing structure is determined, the length of the supporting rod is adjusted by utilizing the nested structure of the outer pipe and the inner pipe, the supporting requirements of the internal and external corners at different positions and different distances in the cantilever structure are met, the universality is strong, the length of the supporting rod is adjusted by utilizing the rough positioning of a plurality of pairs of oppositely arranged limiting holes arranged on the inner pipe along the length direction, the length of the supporting rod is adjusted by utilizing the accurate positioning of two oppositely arranged strip-shaped holes and the limiting holes arranged on the external thread section of the outer pipe, the adjustment of any length of the supporting rod is realized, the inner pipe is prevented from sliding downwards by utilizing the abutting of the adjusting supporting nut and the bottom of the bolt, the use effect is good, the supporting rod is also adjusted to be hinged with the hoop, the adjustment of any inclination angle of the supporting rod is realized, and the popularization and the use are convenient.
2. The method comprises the steps of obtaining the axial force load borne by the inclined support of the adjusting support rod by considering the inclined live load of the adjustable support reinforcing structure and the stable inclination angle of the adjusting support rod, selecting basic parameters of the adjusting support rod, looking up a table to obtain the stability coefficient of an axis compression member of the adjusting support rod, carrying out stability and compression resistance checking calculation on the adjusting support rod until the stability and the actual compression resistance of the adjusting support rod meet the requirements, ensuring the strength and the rigidity of a template at the cornice line part, and accurately welding the inside and outside corner shaping support template according to the actual outside corner or inside corner of the cantilever structure.
3. The method has simple steps, can reduce the construction distance from the cornice to the frame body to the maximum extent in the aspect of supporting the overhanging frame body, reduces the safety risk brought by the roof cornice construction, and is convenient for popularization and use.
In conclusion, the invention can solve the problems of damaged internal and external corners and poor appearance quality of concrete caused by the fact that loose templates cannot be spliced, and meanwhile, in the aspect of supporting the overhanging frame body, the telescopic adjusting rod is adopted, so that the construction distance from the cornice to the frame body can be reduced to the maximum extent, the safety risk caused by roof cornice construction is reduced, the strength and the rigidity of the template at the cornice line part are ensured, the internal corners of the concrete are straight, the external corners of the concrete are square, the appearance quality defect of the concrete is reduced, and the invention is convenient to popularize and use.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a diagram of the oblique supporting and reinforcing state of the cantilever structure of the present invention.
Fig. 2 is a schematic view of the installation relationship between the external corner shaping plate and the adjustable supporting and reinforcing structure.
Fig. 3 is a schematic view of the installation relationship between the internal corner shaping plate and the adjustable supporting and reinforcing structure according to the present invention.
Fig. 4 is a schematic diagram of the fixed angle relationship between the external corner shaping plate and the adjusting support rod.
Fig. 5 is a schematic diagram of the fixed angle relationship between the internal corner shaping plate and the adjusting support rod.
FIG. 6 is a block flow diagram of a method of the present invention.
Description of reference numerals:
1, hoop fastening; 2-hinging the ear plate; 3, an outer tube;
4-external thread; 5-strip-shaped holes; 6, adjusting a support nut;
7-a handle; 8, inserting a pin; 9-inner tube;
10-limiting holes; 11-1-vertical shaping plate of external corner;
11-2-external corner horizontal shaping plate; 12-external corner reinforcing rib plate;
13-1-vertical internal corner shaping plate; 13-2-a reentrant corner non-vertical sizing plate;
14-internal corner reinforcing rib plate; 15-building an outer vertical wall; 16-overhanging structure;
17-erecting a scaffold; 18-vertical sizing plate; 19-non-vertical sizing plates;
20, adjusting the support rod; 21-channel steel.
Detailed Description
As shown in fig. 1 to 6, the method for reinforcing the cantilever structure by obliquely adjustable support comprises the following steps:
step one, determining an adjustable supporting and reinforcing structure: the external corner or the internal corner of the overhanging structure 16 outside the building external vertical wall 15 is obliquely and adjustably supported by using the adjustable supporting and reinforcing structure;
the adjustable supporting and reinforcing structure comprises an anchor ear 1 arranged on a scaffold upright rod 17 positioned between an outer building upright wall 15 and an overhanging structure 16 and an adjusting support rod 20 hinged with the anchor ear 1, wherein one end of the adjusting support rod 20, far away from the anchor ear 1, is fixedly provided with a vertical shaping plate 18 and a non-vertical shaping plate 19 which are matched with an external corner or an internal corner of the overhanging structure 16;
the adjusting support rod 20 comprises an outer tube 3 and an inner tube 9, one end of the inner tube 9 extends into the outer tube 3, an external thread 4 and an adjusting support nut 6 matched with the external thread 4 are arranged on the outer side of one end, matched with the inner tube 9, of the outer tube 3, two strip-shaped holes 5 which are oppositely arranged are formed in the external thread section of the outer tube 3, a plurality of pairs of limiting holes 10 which are oppositely arranged are formed in the inner tube 9 along the length direction, a bolt 8 penetrates through the strip-shaped holes 5 and the pair of limiting holes 10 to connect the outer tube 3 with the inner tube 9, and the adjusting support nut 6 is abutted to the bottom of the bolt 8;
it should be noted that, by determining the adjustable supporting and reinforcing structure, the length of the supporting rod 20 is adjusted by using the nested structure of the outer tube 3 and the inner tube 9, so as to meet the supporting requirements of the internal and external corners at different positions and different distances in the overhanging structure, the universality is strong, the length of the supporting rod 20 is adjusted by using a plurality of pairs of oppositely arranged limiting holes 10 arranged on the inner tube 9 along the length direction to coarsely position, the length of the supporting rod 20 is adjusted by using two oppositely arranged bar-shaped holes 5 arranged on the external thread section of the outer tube 3 and the limiting holes 10 to accurately position the supporting rod 20, the adjustment of any length of the supporting rod 20 is realized, the supporting nut 6 is abutted against the bottom of the bolt 8, the inner tube 9 is prevented from sliding downwards, the use effect is good, the supporting rod 20 is simultaneously hinged to the hoop 1, and the adjustment of any inclination angle of the supporting rod 20 is realized.
Step two, according to the formula Q ═ G + G1+G2+G3Calculating the slant live load Q of the adjustable supporting and reinforcing structure, wherein G is the self weight of the cantilever structure steel concrete, and G1Is the dead weight of the template G2For manually vibrating the load, G3The self-weight load of constructors and small machines and tools is achieved;
step three, determining and adjusting the stable inclination angle of the supporting rod: regarding an acute included angle between a central axis of the adjusting support rod 20 and the vertical shaping plate 18 as a stable inclination angle theta of the adjusting support rod, wherein the angle interval of the stable inclination angle theta of the adjusting support rod is 30-45 degrees;
step four, according to the formula
Calculating the axial force load bearing interval [ F ] of the inclined support of the adjusting support rod 20min,Fmax]Wherein F isminMinimum value in interval of bearing axial force load for inclined support, FmaxThe maximum value of the interval for bearing the axial force load by the inclined support;
step five, determining the length of the adjusting supporting rod: determining the length interval of the adjusting support rod according to the angle interval of the stable inclination angle theta of the adjusting support rod and the position of a scaffold upright rod 17 positioned between the building outer upright wall 15 and the cantilever structure 16;
step six, selecting basic parameters of the adjusting support rod and looking up a table to obtain the stability coefficient of the axis pressed component of the adjusting support rod: selecting basic parameters of an adjusting support rod, wherein the basic parameters of the adjusting support rod comprise the diameter, the thickness, the cross sectional area, the designed value of the compressive strength, the inertia moment of a section, the turning radius and the length coefficient of the section;
according to the formula
Calculating and adjusting slenderness ratio of supporting rod
Wherein mu is the length coefficient of the adjusting support rod, L is the length value of the adjusting support rod in the length interval, and i is the turning radius of the section of the adjusting support rod; inquiring a stability coefficient attached table of the d-type section axis pressed member in the steel structure design standard according to the slenderness ratio of the adjusting support rod to obtain the stability coefficient of the axis pressed member of the adjusting support rod;
step seven, according to the formula
Stabilizing and pressure resistant adjustment strutChecking and calculating to obtain the actual compressive strength value f of the adjusting support rod1N is the axial force load borne by the adjusting support rod, A is the cross section area of the adjusting support rod in the basic parameters of the adjusting support rod, and phi is the stability coefficient of the axial center pressed component corresponding to the basic parameters of the adjusting support rod;
the axial force load N borne by the adjusting support rod is made to be the maximum value F in the interval of bearing the axial force load by the inclined supportmax；
When f is1When the pressure is larger than or equal to f, the stability of the adjusting supporting rod and the actual compressive strength do not meet the requirements, basic parameters of the adjusting supporting rod are replaced, and the step five is executed;
when f is1If the pressure is less than f, adjusting the stability and the actual compressive strength of the supporting rod to meet the requirements, and executing the step eight;
wherein f is a designed value of the compressive strength of the adjusting support rod in the basic parameters of the adjusting support rod;
it should be noted that, consider that adjustable support reinforced structure slant live load and the stable inclination who adjusts the bracing piece acquire the slant of adjusting the bracing piece 20 and support and bear the axial force load, select and adjust bracing piece basic parameter and look up the table and acquire the stability factor of the axle center pressurized component of adjusting the bracing piece, carry out stability and resistance to compression check calculation to adjusting the bracing piece, until the stability and the actual compressive strength of adjusting the bracing piece meet the requirements, ensure the intensity and the rigidity of eaves mouth line position template, according to 16 actual external corner of structure of encorbelmenting or the accurate welding external corner of internal corner design supporting template of internal corner, can solve because the external corner damage that loose formwork concatenation does not lead to in place, the not good problem of concrete appearance quality, reliable and stable.
Step eight, welding the vertical shaping plate and the non-vertical shaping plate: welding and shaping a vertical shaping plate 18 and a non-vertical shaping plate 19 of an external corner or an internal corner of the supporting and overhanging structure 16 at one end of the inner pipe 9 far away from the outer pipe 3;
when the overhanging structure 16 is provided with an external corner, the vertical sizing plate 18 is an external corner vertical sizing plate 11-1, the non-vertical sizing plate 19 is an external corner horizontal sizing plate 11-2, and the external corner vertical sizing plate 11-1 and the external corner horizontal sizing plate 11-2 are welded at one end of the inner tube 9 far away from the outer tube 3, wherein an opening of an external corner sizing support template formed by the external corner vertical sizing plate 11-1 and the external corner horizontal sizing plate 11-2 faces outwards, and an included angle between the central axis of the inner tube 9 and the plane of the external corner vertical sizing plate 11-1 is theta;
when the overhanging structure 16 is provided with an internal corner, the vertical shaping plate 18 is an internal corner vertical shaping plate 13-1, the non-vertical shaping plate 19 is an internal corner non-vertical shaping plate 13-2, the internal corner vertical shaping plate 13-1 and the internal corner non-vertical shaping plate 13-2 are welded at one end of the inner tube 9 far away from the outer tube 3, wherein an opening of an internal corner shaping supporting template formed by the internal corner vertical shaping plate 13-1 and the internal corner non-vertical shaping plate 13-2 faces inwards, and an included angle formed by the central axis of the inner tube 9 and the plane where the internal corner vertical shaping plate 13-1 is located is theta;
step nine, the oblique support of the cantilever structure is reinforced: the adjusting support rod 20 welded with the vertical shaping plate 18 and the non-vertical shaping plate 19 is abutted to the position of the external corner or the internal corner of the overhanging structure 16, the hoop 1 is installed on the scaffold upright rod 17 positioned between the building external upright wall 15 and the overhanging structure 16, the adjusting support rod 20 is connected with the hoop 1 through the hinged ear plate 2, and the external corner or the internal corner of the overhanging structure 16 is obliquely supported and reinforced.
It should be noted that, simultaneously in the aspect of setting up of the support body of encorbelmenting, the construction distance of reduction eaves mouth to support body that can furthest reduces the safety risk that the roofing construction of cornicing brought.
In the embodiment, the side wall of the hoop 1 is provided with a hinged ear plate 2, and one end of the outer tube 3, which is far away from the adjusting support nut 6, is hinged with the hinged ear plate 2; a handle 7 is arranged on the outer side of the adjusting support nut 6.
In the eighth embodiment, in the step eight, the external corner vertical sizing plate 11-1 and the external corner horizontal sizing plate 11-2 are both fixedly connected with one end of the inner pipe 9, which is far away from the outer pipe 3, through an external corner reinforcing rib plate 12;
the internal corner vertical sizing plate 13-1 and the internal corner non-vertical sizing plate 13-2 are both fixedly connected with one end of the inner tube 9 far away from the outer tube 3 through an internal corner reinforcing rib plate 14.
In this embodiment, the external corner horizontal shaping plate 11-2 is provided with a channel steel 21 for shaping a water dripping line.
When the concrete drip line shaping device is used, the channel steel 21 for shaping the drip line is arranged on the external corner horizontal shaping plate 11-2, and the concrete drip line is formed by one-time pouring, so that the concrete drip line shaping device is accurate, convenient and fast.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (4)
1. The method for reinforcing the obliquely adjustable support of the cantilever structure is characterized by comprising the following steps of:
step one, determining an adjustable supporting and reinforcing structure: the adjustable supporting and reinforcing structure is used for carrying out oblique adjustable supporting on an external corner or an internal corner of an overhanging structure (16) on the outer side of the building outer vertical wall (15);
the adjustable supporting and reinforcing structure comprises a hoop (1) arranged on a scaffold upright rod (17) positioned between an outer building vertical wall (15) and an overhanging structure (16) and an adjusting support rod (20) hinged with the hoop (1), wherein one end, far away from the hoop (1), of the adjusting support rod (20) is fixedly provided with a vertical shaping plate (18) and a non-vertical shaping plate (19) which are matched with an external corner or an internal corner of the overhanging structure (16);
the adjusting support rod (20) comprises an outer pipe (3) and an inner pipe (9) with one end extending into the outer pipe (3), an external thread (4) and an adjusting support nut (6) matched with the external thread (4) are arranged on the outer side of one end, matched with the inner pipe (9), of the outer pipe (3), two strip-shaped holes (5) which are oppositely arranged are formed in an external thread section of the outer pipe (3), a plurality of pairs of limiting holes (10) which are oppositely arranged are formed in the inner pipe (9) along the length direction, a bolt (8) penetrates through the strip-shaped holes (5) and the pair of limiting holes (10) to connect the outer pipe (3) with the inner pipe (9), and the adjusting support nut (6) is abutted to the bottom of the bolt (8);
step two, according to the formula Q ═ G + G1+G2+G3Calculating the slant live load Q of the adjustable supporting and reinforcing structure, wherein G is the self weight of the cantilever structure steel concrete, and G1Is the dead weight of the template G2For manually vibrating the load, G3The self-weight load of constructors and small machines and tools is achieved;
step three, determining and adjusting the stable inclination angle of the supporting rod: taking an acute included angle between a central axis of the adjusting support rod (20) and the vertical shaping plate (18) as a stable inclination angle theta of the adjusting support rod, wherein the angle interval of the stable inclination angle theta of the adjusting support rod is 30-45 degrees;
step four, according to the formula
Calculating the load interval [ F ] of the inclined support bearing axial force of the adjusting support rod (20)min,Fmax]Wherein F isminMinimum value in interval of bearing axial force load for inclined support, FmaxThe maximum value of the interval for bearing the axial force load by the inclined support;
step five, determining the length of the adjusting supporting rod: determining the length interval of the adjusting support rod according to the angle interval of the stable inclination angle theta of the adjusting support rod and the position of a scaffold upright rod (17) between the building outer upright wall (15) and the cantilever structure (16);
step six, selecting basic parameters of the adjusting support rod and looking up a table to obtain the stability coefficient of the axis pressed component of the adjusting support rod: selecting basic parameters of an adjusting support rod, wherein the basic parameters of the adjusting support rod comprise the diameter, the thickness, the cross sectional area, the designed value of the compressive strength, the inertia moment of a section, the turning radius and the length coefficient of the section;
according to the formula
Calculating and adjusting slenderness ratio of supporting rod
Wherein mu is the length coefficient of the adjusting support rod, L is the length value of the adjusting support rod in the length interval, and i is the turning radius of the section of the adjusting support rod; inquiring a stability coefficient attached table of the d-type section axis pressed member in the steel structure design standard according to the slenderness ratio of the adjusting support rod to obtain the stability coefficient of the axis pressed member of the adjusting support rod;
step seven, according to the formula
Carrying out stability and compression resistance checking calculation on the adjusting support rod to obtain the actual compression resistance intensity value f of the adjusting support rod1N is the axial force load borne by the adjusting support rod, A is the cross section area of the adjusting support rod in the basic parameters of the adjusting support rod, and phi is the stability coefficient of the axial center pressed component corresponding to the basic parameters of the adjusting support rod;
the axial force load N borne by the adjusting support rod is made to be the maximum value F in the interval of bearing the axial force load by the inclined supportmax；
When f is1When the pressure is larger than or equal to f, the stability of the adjusting supporting rod and the actual compressive strength do not meet the requirements, basic parameters of the adjusting supporting rod are replaced, and the step five is executed;
when f is1If the pressure is less than f, adjusting the stability and the actual compressive strength of the supporting rod to meet the requirements, and executing the step eight;
wherein f is a designed value of the compressive strength of the adjusting support rod in the basic parameters of the adjusting support rod;
step eight, welding the vertical shaping plate and the non-vertical shaping plate: welding a vertical shaping plate (18) and a non-vertical shaping plate (19) of an external corner or an internal corner of the supporting cantilever structure (16) at one end of the inner pipe (9) far away from the outer pipe (3);
when an external corner is arranged on the overhanging structure (16), the vertical sizing plate (18) is an external corner vertical sizing plate (11-1), the non-vertical sizing plate (19) is an external corner horizontal sizing plate (11-2), the external corner vertical sizing plate (11-1) and the external corner horizontal sizing plate (11-2) are welded at one end, far away from the outer pipe (3), of the inner pipe (9), wherein an opening of an external corner sizing support template formed by the external corner vertical sizing plate (11-1) and the external corner horizontal sizing plate (11-2) faces outwards, and an included angle formed by the central axis of the inner pipe (9) and the plane where the external corner vertical sizing plate (11-1) is located is theta;
when the internal corner is formed on the cantilever structure (16), the vertical sizing plate (18) is an internal corner vertical sizing plate (13-1), the non-vertical sizing plate (19) is an internal corner non-vertical sizing plate (13-2), the internal corner vertical sizing plate (13-1) and the internal corner non-vertical sizing plate (13-2) are welded at one end, far away from the outer pipe (3), of the inner pipe (9), wherein an opening of an internal corner sizing support template formed by the internal corner vertical sizing plate (13-1) and the internal corner non-vertical sizing plate (13-2) faces inwards, and an included angle formed by the central axis of the inner pipe (9) and the plane where the internal corner vertical sizing plate (13-1) is located is theta;
step nine, the oblique support of the cantilever structure is reinforced: the adjusting support rod (20) welded with the vertical shaping plate (18) and the non-vertical shaping plate (19) is abutted to the position of the external corner or the internal corner of the cantilever structure (16), the hoop (1) is installed on the scaffold upright rod (17) positioned between the building outer vertical wall (15) and the cantilever structure (16), the adjusting support rod (20) is connected with the hoop (1) through the hinged lug plate (2), and the external corner or the internal corner of the cantilever structure (16) is obliquely supported and reinforced.
2. The method for reinforcing the cantilever structure by obliquely adjustable support according to claim 1, wherein: the side wall of the hoop (1) is provided with a hinged ear plate (2), and one end of the outer pipe (3) far away from the adjusting support nut (6) is hinged with the hinged ear plate (2); a handle (7) is arranged on the outer side of the adjusting support nut (6).
3. The method for reinforcing the cantilever structure by obliquely adjustable support according to claim 1, wherein: in the eighth step, the external corner vertical shaping plate (11-1) and the external corner horizontal shaping plate (11-2) are fixedly connected with one end, far away from the outer pipe (3), of the inner pipe (9) through an external corner reinforcing rib plate (12);
the internal corner vertical shaping plate (13-1) and the internal corner non-vertical shaping plate (13-2) are fixedly connected with one end of the inner tube (9) far away from the outer tube (3) through the internal corner reinforcing rib plate (14).
4. The method for reinforcing the cantilever structure by obliquely adjustable support according to claim 1, wherein: and a channel steel (21) for shaping the water dripping line is arranged on the external corner horizontal shaping plate (11-2).
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