CN101397854B - Enveloping prestressing force fastening type steel tube concrete column and reinforcement method - Google Patents
Enveloping prestressing force fastening type steel tube concrete column and reinforcement method Download PDFInfo
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- CN101397854B CN101397854B CN2008103001871A CN200810300187A CN101397854B CN 101397854 B CN101397854 B CN 101397854B CN 2008103001871 A CN2008103001871 A CN 2008103001871A CN 200810300187 A CN200810300187 A CN 200810300187A CN 101397854 B CN101397854 B CN 101397854B
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Abstract
The invention discloses a fastened steel pipe concrete column confined by pre-stress and a reinforcement method thereof. The column is mainly applied to the reinforcement of a monolayer, multilayer or high-rise frame column which exceeds the limit value of the strength, rigidity or axial compression ratio. The basic principle of the invention is as follows: transverse pre-tensioning of a steel plate which is added to the surface of a rectangular or round reinforced concrete column is built up by screwing down a shear high strength bolt and the resultant force thereof acts on the surface of the reinforced concrete column; in accordance with the principle that acting force equals to counter acting force, the surface of the reinforced concrete column generates a counter acting force (positive pressure) towards the inner wall of the steel plate; in such way, friction force, which is corresponding to the positive pressure and is the so-called shear resistant bearing capacity in a project, is generated between the concrete surface and the inner wall of the steel plate, thereby achieving the loaded effect of the current steel pipe concrete column that is manufactured by casting concrete on the prepared steel pipe. Due to the existence of the transverse pre-stress, the mechanical effect of the steel pipe concrete column in the invention is better than the current one.
Description
Technical field
The present invention relates to the method for a kind of concrete column structure and reinforcing, the method for especially a kind of enveloping prestressing force fastening type steel tube concrete column and reinforcing belongs to the technical field of building structure.
Background technology
At present, when making, make steel pipe for the concrete-filled steel tubular column of highrise building usually earlier; Placing of concrete in the steel pipe then; The problem that this pillar exists is that concrete can shrink when high temperature setting, makes concrete and steel pipe have the gap, is difficult to combine together.For the layer that adds of ready-made building,, often need reinforce pillar for increasing intensity, the rigidity of pillar; Usually being employed in existing pillar outside cornerite steel at present adds the batten plate mode and reinforces; This method is difficult to assurance steel plate and former concrete Transfer of Shear co-operation, and can only consider that steel framework and former concrete separate the strength and stiffness of bearing structure, and its main cause is not have normal pressure between steel plate face and the concrete surface; Promptly can not Transfer of Shear, there is not cooperative basic premise.Also having a kind of is exactly direct casting reinforced concrete around the available coagulation earth pillar, and column section is increased, if do not adopt method such as bar planting; Still can not guarantee both co-operation, this reinforcement means is commonly called as " wearing wadded jacket ", and is not only time-consuming; Difficulty of construction is big, and cost is also higher.
Summary of the invention
Technical problem to be solved by this invention is, a kind of reinforcement means of enveloping prestressing force fastening type steel tube concrete column is provided, and a kind of form of structure of enveloping prestressing force fastening type steel tube concrete column is provided simultaneously.This reinforcement means and structure can be close to the concrete column that is reinforced and encased steel plate and be one through prestressing force, thereby co-operation improves the rigidity and the intensity of concrete column, satisfies user demand.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: the method that enveloping prestressing force fastening type steel tube concrete column is reinforced may further comprise the steps:
(1) original reinforced concrete post is checked and repaired, surface finish, cleaning is smooth;
(2) on reinforced concrete post, hole, implant reinforcing bar; The diameter of implanting reinforcing bar is 16～25mm, and implantation depth is 160～250mm;
(3) at the surface brush high-temperature resistant structural adhesive of reinforced concrete post, in the surface segment outsourcing of the reinforced concrete post steel plate of perforate, the steel plate aperture is greater than the bar planting diameter then, and surface of steel plate 20～40mm is exposed in bar planting.
(4) on the bolt pernetti of steel plate, penetrate the torque-shear type high-strength bolt; Tighten high-strength bolt; Make steel plate laterally set up pretension; And utilize active force to equate with reaction force that principle makes between high-strength bolt and the steel plate to produce normal pressure, thereby have the frictional force of shear behavior, make steel plate be close to the reinforced concrete post surface;
(5) all seams with steel plate adopt the groove butt welding, make all steel plates be linked as sealing integral body;
(6) respectively a bar planting reinforcing bar and steel plate weld all around are welded; Then the outsourcing high grade and mix the fire prevention powder ferro-cement.
The enveloping prestressing force fastening type steel tube concrete rectangular column.The reinforced concrete post that comprises rectangle is surrounded by 4 blocks of angle steel shape steel plates at four jiaos of external surfaces of each section of reinforced concrete post of rectangle, and the rectangular steel plates with height such as angle steel shape steel plate grade is housed between angle steel shape steel plate; Two vertically seams are arranged on each surface of each section of reinforced concrete post; Vertically be provided with torque-shear type high-strength bolt pernetti between the seam; On torque-shear type high-strength bolt pernetti, be installed with the torque-shear type high-strength bolt; Angle steel shape steel plate of each section and rectangular steel plates have the hole by the bar planting position of reinforced concrete post, and hang over rectangle reinforced concrete post surface through this hole, are connected to one with the torque-shear type high-strength bolt between rectangular steel plates and the angle steel shape steel plate.
Described angle steel shape steel plate is L shaped angle with equal legs type cross section, and rectangular steel plates is the yi word pattern cross section.
Extexine point in rectangular steel plates is welded with steel fabric sheet, and is brushed with the high-mark cement fireproof mortar that adds the powder of preventing fires, and its thickness is confirmed by fire-protection rating.
The enveloping prestressing force fastening type steel tube concrete cylindrical.Comprise circular reinforced concrete post; Size on the reinforced concrete post surface of circle according to column diameter is glued with 4～8 blocks of circular-arc cross section steel plates; Circular-arc cross section steel plate is a plurality of sections according to the post high score; Be provided with torque-shear type high-strength bolt pernetti in the seam crossing end, on torque-shear type high-strength bolt pernetti, be installed with the torque-shear type high-strength bolt, the circular-arc cross section steel plate of each section has the hole by the bar planting position of reinforced concrete post; And hang over the reinforced concrete post surface through this hole, be connected to one through the torque-shear type high-strength bolt between the steel plate of circular-arc cross section.
Described circular-arc cross section steel plate is 1/4 circular arc or 1/8 circular section.
The extexine point of steel plate is welded with steel fabric sheet in circular-arc cross section, and is brushed with the high-mark cement fireproof mortar that adds the powder of preventing fires, and its thickness is confirmed by fire-protection rating.
Compared with prior art; The present invention uses fastening steel plate to wrap in the surface of concrete column outward; And adopt the torque-shear type high-strength bolt to be fastenedly connected; The torque-shear type high-strength bolt applies prestressed method for to control prestressing force numerical value with twisting into two parts bolt wabbler incision cross section, and it is simple, accurate that this bolt applies prestressing force.Through the torque-shear type high-strength bolt from around produce extruding force and pretightning force to the centre; The surperficial fastening steel plate with outsourcing of the concrete column that is reinforced is close together; And the generation normal pressure, through the shear-carrying capacity of contact surface, make both co-operation; Not only consolidation effect is good, difficulty of construction is little and save time, laborsaving, cost is lower.Its basic principle is to make the outer fastening steel plate that is added on rectangle or circular reinforced concrete post surface; Set up horizontal pretension after tightening through the torque-shear type high-strength bolt; Its force action is in the reinforced concrete post surface; Equal the reaction force principle according to active force, the reinforced concrete post surface also produces reaction force (normal pressure) to fastening steel plate inwall, thereby concrete surface and fastening steel plate medial surface are had and the corresponding frictional force of normal pressure; Be the shear-carrying capacity in the engineering, reach the existing steel pipe stressed effect of the steel core concrete column of fluid concrete again that has earlier.Because the existence of transverse prestress, its mechanics effect is better than the former.In the encased steel plate outside, utilize bar planting head and torque-shear type high-strength bolt pernetti to fix a little, behind the spot welding steel fabric sheet, brush is mixed with the fireclay mortar of fire prevention powder again, and its thickness is confirmed by fire-protection rating.The present invention is mainly used in the reinforcement and strengthening after individual layer, multilayer and high-rise frame major gene intensity, rigidity or limit value of axial compression ratio transfinite.
Description of drawings
Fig. 1 is the side structure sketch map of enveloping prestressing force fastening type steel tube concrete rectangular column of the present invention;
Fig. 2 is the cross-sectional configuration sketch map of enveloping prestressing force fastening type steel tube concrete rectangular column of the present invention;
Fig. 3 is the self equilibrium systems that enveloping prestressing force fastening type steel tube concrete rectangular column surface action power of the present invention (transverse prestress) and reaction force (post is to the reaction force of steel plate) equate formation power;
Fig. 4 is the cross-sectional configuration sketch map of enveloping prestressing force fastening type round steel pipe concrete column of the present invention;
Fig. 5 is the self equilibrium systems that enveloping prestressing force fastening type round steel pipe concrete column of the present invention cross section active force (hoop pretension) and reaction force (post is to steel plate reaction force radially) equate formation power.
The specific embodiment
Embodiments of the invention 1: enveloping prestressing force fastening type steel tube concrete rectangular column.Like accompanying drawing 1, shown in 2, at first reinforced concrete post 1 external surface of rectangle is checked and repaired, surface finish, cleaning is smooth, on reinforced concrete post 1, hole, plant reinforcing bar by designing requirement; The bar diameter of implanting is 16～25mm, and implantation depth is 160～250mm, and steel bar end exposes the surface 30～40mm of reinforced concrete post 1, and gives 8 fastening steel plate perforates respectively to the bar planting position, and the aperture should be greater than the bar planting diameter, in order to the adjustment steel plate position.8 blocks of fastening steel plates (4 blocks of angle steel shape steel plates 2 that reinforced concrete post is 1 four jiaos and 4 middle rectangular steel plates 3; Angle steel shape steel plate 2 is L shaped angle with equal legs type cross sections; Rectangular steel plates 3 is the yi word pattern cross section) divide plurality of sections along the short transverse of reinforced concrete post 1, every section 1～2m has two vertically seams on each surface of each section; Vertically be provided with torque-shear type high-strength bolt pernetti 4 between the seam, on torque-shear type high-strength bolt pernetti 4, be installed with torque-shear type high-strength bolt 5.Segmentation is at reinforced concrete post 1 external coating high-temperature resistant structural adhesive, by the bar planting position respectively correspondence hang up 8 blocks of fastening steel plates.Torque-shear type high-strength bolt 5 on the torque-shear type high-strength bolt pernetti 4 is tightened (wabbler is cut off promptly and tightened), make 8 blocks of fastening steel plates laterally produce pretension P (as shown in Figure 3), the P that makes a concerted effort of pretension P
1=2 * 1414P=2.828P is acted on the former steel concrete post 1 by four jiaos on post, according to active force equal the reaction force principle (as shown in Figure 3, P
1=P '
1), P ' then
1The P that makes a concerted effort
2=2 * 2.828P=5.656P reacts on fastening steel plate medial surface, also produces normal pressure between reinforced concrete post 1 surface and the fastening inner surface of steel plate, and this is to guarantee fastening steel plate and reinforced concrete post 1 cooperative shearing (N
v=α
Rη μ P) source, all seams with steel plate adopt the groove butt welding then, make all steel plates be linked as sealing integral body, respectively a bar planting reinforcing bar and steel plate weld all around are welded; Then at the extexine spot welding steel fabric sheet of rectangular steel plates 3, and the high-mark cement fireproof mortar that brush adds the powder of prevent fires get final product, and it is definite that the thickness of fireproof mortar is pressed fire-protection rating.
The embodiment of the invention 2: enveloping prestressing force fastening type steel tube concrete cylindrical.Like accompanying drawing 4, shown in 5, at first reinforced concrete post 1 external surface of circle is checked and repaired, surface finish, cleaning is smooth; On reinforced concrete post 1, hole, plant reinforcing bar by designing requirement; The bar diameter of implanting is 16～25mm; Implantation depth is 160～250mm; Steel bar end exposes the surface 30～40mm of reinforced concrete post 1; And ((D＞800mm) circular-arc cross section steel plate 6 (steel plate 6 in circular-arc cross section is 1/4 circular arc or 1/8 circular section) perforate, the aperture should be greater than the bar planting diameter, in order to the adjustment steel plate position for D≤800mm) or 8 to give 4 respectively to the bar planting position.4 or 8 blocks of circular-arc cross section steel plates 6 divide plurality of sections along the short transverse of reinforced concrete post 1, every section 1～2m.Behind reinforced concrete post 1 surfaces coated high-temperature resistant structural adhesive, segmentation at once hangs up circular-arc cross section steel plate 6, on torque-shear type high-strength bolt pernetti 4, is installed with torque-shear type high-strength bolt 5.Tighten torque-shear type high-strength bolt 5; Make circular-arc cross section steel plate 6 hoops produce pretension
; Pretension
makes 6 pairs of reinforced concrete posts of circular-arc cross section steel plate, 1 surface produce precompression; As shown in Figure 5; Be reinforced concrete post 1 surface with circular-arc cross section steel plate 6 between produce positive compressive stress, thereby guarantee circular-arc cross section steel plate 6 with reinforced concrete post 1 surface transmission shear stress co-operation.When torque-shear type high-strength bolt 5 reaches the fastening force of designing requirement; The wabbler place is cut off; Also reach the horizontal pretension of fastening generation; Whole circumference length reinforced concrete post 1 surface to circle under the pretension effect produces reaction force; Equal the reaction force principle according to active force; Then reinforced concrete post 1 surface produces reaction stresses
to circular-arc cross section steel plate 6 inboards, and is as shown in Figure 5, thereby forms self-balancing structural system.Segmentation welds a bar planting reinforcing bar and steel plate 6 plug weldings of circular-arc cross section; All seams with circular-arc cross section steel plate 6 adopt the groove butt welding then; Make all circular-arc cross section steel plates 6 be linked as sealing integral body; Fixing steel fabric sheet on bar planting head and torque-shear type high-strength bolt pernetti 4 is spread the high-mark cement fireproof mortar layering that is mixed with the fire prevention powder, and fireproof mortar thickness is confirmed by the structure fire grade.
Claims (7)
1. the method that enveloping prestressing force fastening type steel tube concrete column is reinforced is characterized in that, may further comprise the steps:
(1) original reinforced concrete post is checked and repaired, surface finish, cleaning is smooth;
(2) on reinforced concrete post, hole, implant reinforcing bar; The diameter of implanting reinforcing bar is 16～25mm, and implantation depth is 160～250mm;
(3) at the surface brush high-temperature resistant structural adhesive of reinforced concrete post, in the surface segment outsourcing of the reinforced concrete post steel plate of perforate, the steel plate aperture is greater than the bar planting diameter then, and surface of steel plate 20～40mm is exposed in bar planting;
(4) on the bolt pernetti of steel plate, penetrate the torque-shear type high-strength bolt; Tighten the torque-shear type high-strength bolt; Make steel plate laterally set up pretension; And utilize active force to equate with reaction force that principle makes between torque-shear type high-strength bolt and the steel plate to produce normal pressure, thereby have the frictional force of shear behavior, make steel plate be close to the reinforced concrete post surface;
(5) all seams with steel plate adopt the groove butt welding, make all steel plates be linked as sealing integral body;
(6) respectively a bar planting reinforcing bar and steel plate weld all around are welded; Then the outsourcing high grade and mix the fire prevention powder ferro-cement.
2. enveloping prestressing force fastening type steel tube concrete rectangular column; The reinforced concrete post (1) that comprises rectangle; It is characterized in that: four jiaos of external surfaces at each section of reinforced concrete post (1) of rectangle are surrounded by 4 blocks of angle steel shape steel plates (2), and the rectangular steel plates (3) with height such as angle steel shape steel plate (2) grade is housed between angle steel shape steel plate (2); Two vertically seams are arranged on each surface of each section of reinforced concrete post (1); Vertically be provided with torque-shear type high-strength bolt pernetti (4) between the seam; On torque-shear type high-strength bolt pernetti (4), be installed with torque-shear type high-strength bolt (5); Angle steel shape steel plate (2) of each section and rectangular steel plates (3) have the hole by the bar planting position of reinforced concrete post (1); And hang over rectangle reinforced concrete post (1) surface through this hole, be connected to one with torque-shear type high-strength bolt (5) between rectangular steel plates (3) and the angle steel shape steel plate (2).
3. enveloping prestressing force fastening type steel tube concrete rectangular column according to claim 2 is characterized in that: described angle steel shape steel plate (2) is L shaped angle with equal legs type cross section, and rectangular steel plates (3) is the yi word pattern cross section.
4. enveloping prestressing force fastening type steel tube concrete rectangular column according to claim 2 is characterized in that: the extexine point in rectangular steel plates (3) is welded with steel fabric sheet, and is brushed with the high-mark cement fireproof mortar that adds the powder of preventing fires.
5. enveloping prestressing force fastening type steel tube concrete cylindrical; Comprise circular reinforced concrete post (1); It is characterized in that: be glued with 4～8 blocks of circular-arc cross section steel plates (6) in the surperficial size of the reinforced concrete post (1) of circle according to column diameter; Circular-arc cross section steel plate (6) is a plurality of sections according to the post high score; Be provided with torque-shear type high-strength bolt pernetti (4) in the seam crossing end, on torque-shear type high-strength bolt pernetti (4), be installed with torque-shear type high-strength bolt (5), the circular-arc cross section steel plate (6) of each section has the hole by the bar planting position of reinforced concrete post (1); And hang over reinforced concrete post (1) surface through this hole, be connected to one through torque-shear type high-strength bolt (5) between the circular-arc cross section steel plate (6).
6. enveloping prestressing force fastening type steel tube concrete cylindrical according to claim 5 is characterized in that: described circular-arc cross section steel plate (6) is 1/4 circular arc or 1/8 circular section.
7. enveloping prestressing force fastening type steel tube concrete cylindrical according to claim 5; It is characterized in that: the extexine point of steel plate (6) is welded with steel fabric sheet in circular-arc cross section; And being brushed with the high-mark cement fireproof mortar that adds the powder of preventing fires, its thickness is confirmed by fire-protection rating.
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| CN101397854B true CN101397854B (en) | 2012-01-11 |
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