CN100347390C - External anchor steel reinforcing method for anchor bolt and reinforced concrete structure - Google Patents
External anchor steel reinforcing method for anchor bolt and reinforced concrete structure Download PDFInfo
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- CN100347390C CN100347390C CNB2005100173514A CN200510017351A CN100347390C CN 100347390 C CN100347390 C CN 100347390C CN B2005100173514 A CNB2005100173514 A CN B2005100173514A CN 200510017351 A CN200510017351 A CN 200510017351A CN 100347390 C CN100347390 C CN 100347390C
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Abstract
The present invention discloses an anchor bolt and an outer steel anchored reinforcing method for a reinforced concrete structural member. An anchor rod and a casing tube of the anchor bolt are provided with screw thread fit sections; a fastening head of the anchor rod is provided with an obconic section and a fastening device; the expansion ends of the anchor rod and the casing tube are provided with expansion joints or expansion grooves. The outer steel anchored reinforcing method comprises: on the outer surface of a reinforced concrete structural member, through holes of a steel ribbon board and blind holes of a concrete structure, which are matched with the through holes, are prefabricated on the corresponding positions of the reinforced steel ribbon board and the concrete structure according to the design requirement of strengthening and reinforcement and certain rules of distribution; anchor bolts are arranged on the through holes and the blind holes; the tail part of each anchor bolt expands and is fastened by screwing and extruding the anchor bolt to cause the steel ribbon board to be anchored on the outer surface of the reinforced concrete structural member and realize the strengthening and the reinforcement of the concrete structural member. The anchor bolt of the present invention has strong anchoring capacity, perpendicular anchoring force and simultaneously has self balancing horizontal force system, thereby enhancing the shear resistance or the stretching resistance of the reinforced steel ribbon board; compared with an outer steel riveted reinforcement method and a steel stuck method, the construction method considerably shortens a construction period and obviously reduces construction cost.
Description
One. technical field: the present invention relates to a kind of reinforced concrete structure in reinforced concreter China Democratic National Construction Association, the bridge be carried out the reinforcing technology, particularly relate to a kind of crab-bolt and reinforced concrete structure external anchor steel reinforcement means.
Two. background technology: because the unpredictability of the complexity of geo-logical terrain and some situation and the restriction of know-how, in the design and construction of reinforced concrete structure, can occur some design mistake or constructional deficiency unavoidably or with material amount problem; Or because disasters such as floods, disaster caused by a windstorm, fire and earthquake, tsunami make building suffer to damage to a certain degree; Or need technological transformation, need to increase structural loads, enlarge the post net, change the structure function of use; Or because after building was delivered for use, mismanagement or improper made reasons such as carbonation of concrete, corrosion of steel bar, to the processing that needs reinforcement of the various structures of building.
China Engineering Construction Standardization Association's standard, concrete structure reinforcement technical specification CECS25:90 according to Chinese Plan Press in 1992 publication introduce, concrete consolidation process China is started from the fifties in last century, particularly in the last few years, because a variety of causes, need reinforce the concrete of some engineering, safe in utilization to guarantee it, prolong service life or change use.Domestic each province, city, municipal design, construction, R﹠D institution have accumulated many invaluable experiences in the consolidation process of carrying out building, its technical specification is on being accumulated experience in the basis in summary, the establishment of absorption data from abroad, solicit units concerned and expert opinion at last, identify examination final version with the standard of reinforcing technical committee by national building.By the reinforcing technique standard as can be known, the reinforcement means to China's fabric structure has: the enlarging section reinforcing method, the encased steel reinforcing method gives the stress reinforcing method, changes knot force path reinforcing method, outside reinforcement by sticking of sheets etc.
So-called outside reinforcement by sticking of sheets, be meant the concrete structure exterior outside surface that is needing reinforcement, use the building adhesive specially, steel plate is pasted firmly, improving the structural member supporting capacity and to satisfy a kind of reinforcement means of normal instructions for use, this reinforcement means is applicable to being bent of carrying static(al) effect, tensional element, and environment temperature is not more than 60 ℃, relative humidity is not more than 70%, and the concrete structure of the environment of no chemical attack influence is reinforced.
The advantage of outside reinforcement by sticking of sheets is that stronger at the cement strength of reinforcing initial stage glue, strengthening steel slab is stressed more even.The open defect but the outside reinforcement by sticking of sheets of this kind also comes out in practice process, (1). the construction technology complexity, labor strength is big.Because work progress need carry out surfacing to concrete surface, polish and remove the former surface layer of 2～3mm, appear new face, to the sticking also handy sandblast of face of steel plate, grinder buffing, construction volume and labour intensity are big, work under bad environment, the also handy acetone of two adhesive surfaces carries out the wiping cleaning treatment, the contaminated environment air.(2). outside reinforcement by sticking of sheets, its randomness is bigger in the work progress, and construction quality is difficult for guaranteeing.It is whole that this kind reinforcing method requires the concrete outer surface to pat, and former existence of floating ash can not be arranged, the technological requirement strictness, and glue-line is wanted evenly can not produce bubble, and technology difficulty reaches, and causes construction quality to be subjected to the influence of Changes in weather and implementer's working sense of responsibility bigger.(3). glue-line temperature tolerance weatherability is relatively poor.Because glue-line belongs to epoxide-resin glue, bonding force begins to weaken in the time of 70 ℃, and As time goes on, glue-line is aging gradually, in long adverse circumstances, and the easy carbonization crisp pastry of concrete surface, bonding force weakens by a relatively large margin thereupon, descends.(4). the implementation cost height.Because the construction working amount is big, very time-consuming day, glue consumption was big, and the expense height improves the engineering reinforcement cost by a relatively large margin, cause client to pay the economic cost height, and unit in charge of construction's economic benefit is lower relatively.
Several problems at outside reinforcement by sticking of sheets existence, Chinese patent ZL03128154.0, name is called: in " reinforced concrete structure outer rivet steel reinforcing method and special-purpose rivet thereof ", a kind of improvement steel-bonded reinforcement method has been proposed, this patent is simplified the implementation procedure of reinforcement by sticking of sheets, reduces the construction working amount to a certain extent, improves work efficiency, reduce job costs, improve construction quality.But also there is tangible problem in the ZL03128154.0 patent, it is bonding that is exactly that rivet still relies on adhesive to be bonded in the concrete rivet hole, still do not overcome the relatively poor problem of resin glue temperature tolerance weatherability fully, in case the rivet glue-line comes off or aging, the rivet clasp power of its rivet will reduce significantly, its rivet clasp quality also is affected, the rivet cross section is square, can play the anti-rotation effect, the upper and lower cross section of rivet is identical, in case come unstuck or glue-line aging, then cause forfeiture of rivet clasp power or part forfeiture easily, the construction quality of this reinforcement means is descended.In addition, execute in the brill process at rivet hole, be difficult to remove fully the floating ash in the blind hole, have floating ash, the bonding force of glue-line is influenced also bigger; Rivet length is too short in addition, and reinforcement rivet clasp steel plate bar width has only 10cm, and rivet has only delegation, makes the reinforcement steel plate bar can not the strengthening action of fine performance tension.
Three. summary of the invention:
The objective of the invention is: overcome the deficiencies in the prior art, provide that a kind of construction is simple, work efficiency is high, anchored force is strong, strengthening quality is reliable, lower-cost crab-bolt and reinforced concrete structure external anchor steel reinforcement means.
Technical scheme of the present invention is: a kind of crab-bolt, contain anchor pole and sleeve pipe, be provided with the inverted cone section at the anchor pole fastener head, on inverted cone section top retention mechanism is arranged, be provided with one or one or more in the diametric(al) of the expanding end of anchor pole and sleeve pipe and have the dilatation joint or the expansion slot of certain-length, described anchor pole and sleeve pipe are provided with the threaded engagement section, and the step pipeline section of a breach greater than semicircle arranged in the sleeve pipe termination of fastening end.
The expanding end that described sleeve pipe cooperates with anchor pole is provided with dilatation joint or the expansion slot more than three or three, at the expanding end of anchor pole chamfering is arranged, and is provided with intersection dilatation joint or the expansion slot that two or more has certain-length in the approximate diameter direction of cross section.
Described casing length does not have and anchor pole dilatation joint or the socket of expansion slot section, and the dilatation joint of described anchor pole or expansion slot length section diameter are littler than thread segment.Described anchor pole retention mechanism is the equilateral triangle projection, or is the square projection, or is the regular pentagon projection, or is the regular hexagon projection.
A kind of reinforced concrete structure external anchor steel reinforcement means that utilizes above-mentioned crab-bolt, at the reinforced concrete structure external surface, designing requirement according to reinforcing, press certain regularity of distribution at a certain distance respectively in the grid of steel bars through hole and the concrete structure blind hole of reinforcing prefabricated mutual coupling on grid of steel bars and the concrete structure relevant position, bloated nail in top and described crab-bolt are installed in the hole of mating mutually, tighten described crab-bolt, the bloated nail in described top inserts described crab-bolt afterbody gradually, described crab-bolt afterbody is expanded to tighten up, after expanding, described crab-bolt afterbody makes the described casing expandable of this one, grid of steel bars is anchored at the reinforced concrete structure external surface, realize concrete structural member reinforcing, and anchoring from beam central authorities simultaneously to the both sides anchoring of progressively constructing.
The bloated nail in above-mentioned top is a cone or the truncated cone; The expand half cone drift angle of nail of described top is 2 °～5 ° a coning angle, and the top nail that expands is combined by two circular cones or three continuous transition-cones, or the top nail that expands is combined by one section band transition arc cylinder transition-cone that links to each other with one or two.
Reinforcing grid of steel bars width is between 10～30cm, crab-bolt 2～4 row, crab-bolt between the different rows is similar to quincunx layouting, avoid on the same parallel lines of the horizontal direction of same grid of steel bars, arranging two or two above crab-bolts, with distance between the two adjacent crab-bolts of delegation between 20～100cm.
The crab-bolt diameter is φ 8～φ 14, anchor depth degree is 8～10 times of crab-bolt diameters, the crab-bolt diameter hour is got higher multiple, get low multiple when the crab-bolt diameter is big, crab-bolt is apart from the edge 2～3cm of reinforcing grid of steel bars, in the reinforcing of concrete solid floor, distance should be less than 2 times of reinforcement anchor steel grid of steel bars width between the two adjacent grid of steel bars.
In 2/3 scope of length overall L in the middle of reinforcing grid of steel bars, be less than or equal to 10～20% of L with the distance between the adjacent crab-bolt of delegation's two-phase, in the 1/6 length overall L scope of reinforcing the grid of steel bars two ends, the shearing resistance of each crab-bolt is greater than the design stretching resistance of grid of steel bars, and satisfy the design stretching resistance of the design shearing resistance of following relationship formula: 0.8n * each crab-bolt greater than grid of steel bars, wherein n is the crab-bolt number in the grid of steel bars one end 1/6 length overall L scope.
External anchor steel reinforcing design principle is:
1. according to CECS25:90 concrete structure reinforcement demand of technical standard, the steel area that needing to replace reinforcement with the grid of steel bars sectional area of equivalent, when calculating the grid of steel bars sectional area, need add the area that the anchor hole size forms, and can not arrange more than one crab-bolt at the horizontal same parallel position of strengthened steel slat, promptly can only arrange a crab-bolt at the horizontal same parallel position of strengthened steel slat, the crab-bolt of different rows will be staggeredly arranged, i.e. quincuncial arrangement.
2. the anchoring grid of steel bars is generally at 100mm to 300mm, and crab-bolt can be 2 row, or 3 row, or 4 row, the multirow crab-bolt, and the broad grid of steel bars can better be brought into play the anchoring strengthening action, more can improve the concrete structural-load-carrying capacity.
3. crab-bolt generally adopts φ 8～φ 14 standards, long for diameter 8～12 times of crab-bolt, i.e. and L=(8～12) D, with low multiple, D hour used higher multiple when D was big.
4. crab-bolt is arranged, in the 1/6 length overall L scope on anchoring grid of steel bars both sides, distance with adjacent two crab-bolts of delegation is 200mm, in 2/3 scope of total length L, with the adjacent crab-bolt of delegation two-phase apart between 200mm～1000mm, from the grid of steel bars two ends by little gradually to middle transition, the middle part maximum, the crab-bolt anchorage point is apart from grid of steel bars edge 2～3cm.
5. end anchorage is held and is cut in the zone, and the shearing resistance of each crab-bolt should satisfy relational expression: 0.8nNc＞Nt, and wherein, n is that the end is held and cut the crab-bolt number, and Nt is the grid of steel bars stretching resistance, and Nc is the shearing resistance of a crab-bolt.Crab-bolt is identical with the grid of steel bars material with material, or a little more than the grid of steel bars material.
6. external anchor steel method job practices; Make the steel plate bar of different in width and different length according to the designing requirement of reinforcement anchor steel reinforcing method, layouting according to crab-bolt requires to draw a center line, draws punching or punching again behind good punching or the punching position, and it is standby to deliver to the job site.
The concrete body structure surface of reinforcing is wanted in cleaning, general smooth getting final product, the grid of steel bars that will reinforce is attached to the concrete body structure surface, aim at the hole that grid of steel bars processes from the mediad two ends, in the concrete structure, get out the coupling hole with Churn drill, after reaching the degree of depth, the crab-bolt that has the bloated nail in top is installed, and tightens the top expansion anchor bolt and reinforce.
Positive beneficial effect of the present invention is:
1. external anchor steel reinforcement means of the present invention, the crab-bolt anchored force is strong, makes reinforcement concrete structure strengthening construction reliable in quality guaranteed.Thoroughly overcome the drawback that adhesive-layer easily wears out, comes unstuck, reinforcement edge descends, in steel plate being anchored in concrete structural member surface construction processing procedure, when the crab-bolt fastening end constantly tighten make cone top expand nail progressively extruding enter near the crab-bolt expanding end cross-section center, the sectional area expansion of crab-bolt expanding end is increased, firmly be fixed in 7～10 centimeters degree of depth places of concrete structural member, never becoming loose.The power that upwards tightens up of utilizing mechanical presses power to cause the crab-bolt termination to expand, reaction the tighten up power downward with crab-bolt fastening end inverted cone interacts, and will reinforce grid of steel bars and firmly be fixed on concrete structural member external surface.
2. there is one section inverted cone section crab-bolt of the present invention fastening end, tighten crab-bolt after, crab-bolt not only has the anchored force perpendicular to the concrete body structure surface, produces one group of self-balancing horizontal force system simultaneously, has improved the shearing resistance or the resistance to tension of strengthened steel slat to a certain extent.
3. external anchor steel reinforcing method of the present invention, under the grid of steel bars thickness situation identical with width, with the beam or the plate of crab-bolt reinforcing method reinforcement, its supporting capacity is greater than the beam or the plate of the reinforcement of rivet reinforcing method, as same beam with the wide steel plate bar reinforcement of 10cm, the crab-bolt reinforcing method is with 2 row crab-bolt anchorings, the resistance to tension of steel plate bar can better play a role, and uses the rivet rivet clasp, and the centre has only delegation's rivet, the grid of steel bars resistance to tension can not finely play a role like this, and part material resistance to tension is wasted.
4. external anchor steel reinforcing method of the present invention, its construction cost obviously reduces than steel bonding method, also reduces than rivet reinforcing method cost.The crab-bolt reinforcing method is economized on glue than every square metre of steel bonding reinforcing method and is taken more than 200 yuan, and sturdy and durable, and construction quality is better than steel bonding reinforcing method.Rivet reinforcing method tack holes, blow the hole, blow away the floating ash of concrete in the hole, hole flushing with pressure-air, the hole of boring with acetone or alcohol wash could the glue mixing filler, acetone or alcohol price are higher, and be volatile and consumption is more, filler in the hole again after the glue mixing, working procedure is more, numerous and diverse, and acetone, alcohol and glue have penetrating odor, pollute construction environment, and cost is relatively also higher.After the crab-bolt reinforcing method has bored the hole, need not blow the hole, not need hole flushing, not need glue mixing, filler, non-stimulated smell in the construction environment, every square metre construction cost is lower about 60 yuan than rivet reinforcing method, increases construction enterprises' profit, also saves the spending of entrusting unit in charge of construction to a certain extent, and improved construction quality to a certain extent, under the situation of identical materials, the supporting capacity after its reinforcement is than rivet reinforcing method height, and the aging trouble and worry of not coming unstuck.
5. job practices of the present invention than the outer rivet steel reinforcing method time of shortening construction period 40～50%, significantly reduces construction cost.
Four. description of drawings:
Fig. 1 is the crab-bolt structural representation;
Fig. 2 is one of upward view of crab-bolt shown in Figure 1;
Fig. 2-1 be crab-bolt shown in Figure 1 upward view two;
Fig. 2-2 be crab-bolt shown in Figure 1 upward view three;
Fig. 3 is one of vertical view of crab-bolt shown in Figure 1;
Fig. 3-1 be crab-bolt shown in Figure 1 vertical view two;
Fig. 3-2 be crab-bolt shown in Figure 1 vertical view three;
Fig. 4 is one of bloated structural representation in top;
Fig. 4-1 is two of the bloated structural representation in top;
Fig. 4-2 is three of the bloated structural representation in top;
Fig. 5 is a crossbeam reinforcement crab-bolt reinforcing method construction schematic diagram;
Fig. 6 is the upward view crab-bolt of the upward view crossbeam reinforcement crab-bolt reinforcing method shown in Figure 5 construction schematic diagram of layouting;
Fig. 7 is a crossbeam shearing resistance reinforcing construction structural representation;
Fig. 7-1 is a shearing resistance panting beam structure sectional view shown in Figure 7;
Fig. 8 is a solid floor reinforcing construction structural representation;
Fig. 8-1 distributes for solid floor soffit strengthened steel slat and crab-bolt is layouted schematic diagram.
Five. the specific embodiment:
Embodiment one: one of typical concrete structural strengthening form, and with extruding external anchor steel reinforced concrete longeron flexural strength, referring to Fig. 5, Fig. 6, among the figure, 10 is the concrete beam, and 9 is strengthened steel slat, and 2 is crab-bolt, certain rectangular cross section beam, sectional area is of a size of 600 * 250mm
2, beam span is 7.8M, and the concrete design strength grade is C20, needs to increase by one elongated thickness 3mm in the soffit by instructions for use, and the grid of steel bars of wide 150mm carries out external anchor steel to be reinforced, and adopts φ 14 crab-bolts, and bolt length is 84mm.
The ft=3 of every grid of steel bars maximum pull Nt=t * (b-d) * (150-14) * 210=85.68 (KN) wherein, Nt designs pulling force for grid of steel bars, t is grid of steel bars thickness mm, b is grid of steel bars width mm, d is crab-bolt diameter mm,
Ft designs tensile strength KN/mm for grid of steel bars
2
2. in the scope of anchorage zone, the shearing that each crab-bolt can be born is:
This formula is a reinforcing standard empirical formula.
3. need bear the crab-bolt number of shearing: total shearing is a grid of steel bars pulling force Nt/Nc=crab-bolt number (n), be n=85.68/24.06=3.56 (individual), for the sake of security, get n=5, promptly use 5 crab-bolts, make it to satisfy the design stretching resistance of the design shearing resistance of 0.8n * each crab-bolt greater than grid of steel bars, 0.8 * 5 * 24.06=96.24＞85.68 meet the requirement of design principles
4. crab-bolt layout, beam length L=7800mm, 1/6L=1300mm arranges crab-bolt in two ends 1.3M place scope, the distance of adjacent two crab-bolts of every capable crab-bolt is 200mm, strengthen arranging on the grid of steel bars 2 row crab-bolts at the 150mm width, apart 80mm is quincunx layouts, and in the 2/3L scope, two adjacent crab-bolts distances are 300～600mm, strengthen distance from two ends gradually to central authorities and arrange, meet the designing requirement of external anchor steel reinforcing method.
5. punch, successively on 3 * 150 * 7800 grid of steel bars, beat the through hole of φ 14, pore size distribution such as Fig. 2.
6. anchoring construction: the processing of reinforcement soffit is smooth, with accomplish fluently anchoring through hole φ 14 to weld 3 * 150 * 7800 grid of steel bars 9 in place in beam 10 soffit central authorities, both sides are fixed, and the hole at grid of steel bars 9 middle parts is held successfully, bore the coupling hole with Churn drill in concrete, 6 times of crab-bolt diameters of hole depth, what a coupling hole 6 * 14=8.4 centimetre bores, and the bloated nail 7 in a crab-bolt 2 and top is installed, and tighten the crab-bolt swelling, from beam central authorities simultaneously to the both sides anchoring of progressively constructing.Its construction principle is: mechanical force extruding crab-bolt, and in tightening the crab-bolt process, the bloated nail 7 in top inserts the crab-bolt afterbody gradually, the crab-bolt afterbody is expanded tighten up, and crab-bolt is extruded expansion, and machinery tightens up power and can not disappear, and the power that tightens up is strong, and the reinforcing construction quality is good.
Embodiment two: two of typical concrete structural strengthening form, and with extruding crab-bolt steel shearing resistance stirrup reinforcing concrete longeron shear strength, referring to Fig. 7, Fig. 7-1,11 is the concrete beam among the figure, and 2 is crab-bolt, and 12 is stirrup.Certain rectangular cross section beam, sectional area is of a size of 600 * 250mm
2, beam span is 7.8M, and the concrete design strength grade is C20, need increase stirrup in the 1000mm scope of both ends by instructions for use, and stirrup is a U-shaped, and stirrup is wide to be 60mm, and crab-bolt φ 14, and the design pulling force of every stirrup is:
Nt=3 * (60-14) * 210=28.98KN, the shearing that each crab-bolt can be born is:
Need bear the crab-bolt number of shearing: n=Nt/Nc=28.98/24.06=1.2 (individual), actual peek n=2,0.8n * Nc=0.8 * 2 * 24.06-38.50KN＞28.98KN meets the requirement of design principles.Job practices does not repeat at this with embodiment one.
Embodiment three: three of typical concrete structural strengthening form, and with the solid reinforced concrete floor of crab-bolt steel reinforcing method reinforcing, referring to Fig. 8, Fig. 8-1,13 is solid concrete building plate among the figure, and 14 is strengthened steel slat, and 2 is crab-bolt.
1. existing pour concrete plane floor is of a size of 6 * 3.3M
2Thickness of slab 120mm, joining reinforcing bar at the bottom of the designing requirement plate is φ 12, and spacing is 100mm, joins φ 8 in fact, spacing is the 150mm reinforcing bar, the concrete design strength grade is C20, now reinforces by external anchor steel anchoring reinforcing method at the bottom of the plate, with 3 * 150mm, spacing is that the 200mm grid of steel bars reinforces, every grid of steel bars design maximum pulling force Nt=3 * (150-14) * 210=85.68 (KN)
2. in the scope of anchorage zone, the shearing that each crab-bolt can be born is:
3. need bear the crab-bolt number of shearing: crab-bolt number (n)=Nt/Nc=85.68/24.06=3.56 (individual), actual peek n=5.
4.0.8n * Nc=0.8 * 5 * 24.06=96.24＞85.68 meet the requirement of design principles.Soffit reinforces grid of steel bars and schematic diagram such as Fig. 8 are arranged in the crab-bolt distribution, and crab-bolt layout, punching and anchoring construction do not repeat at this with embodiment one.
Embodiment four: referring to Fig. 1, and Fig. 2, Fig. 2-1, Fig. 2-2, Fig. 3, Fig. 3-1, Fig. 3-2, in the drawings, 2 is anchor pole, and 4 is inverted cone segment, and 3 for tightening up mechanism, can be the equilateral triangle projection, or be square protrusions, or be the regular hexagon projection, 6 is dilatation joint or expansion slot, and 1 for having the sleeve pipe of step 5.
Embodiment five: referring to Fig. 4, Fig. 4-1, Fig. 4-2,7 is the bloated nail in top that has only a semi-cone angle among Fig. 4, and 7 is bloated nail the in circular cone top that two semi-cone angle are arranged among Fig. 4-1, and 7 for being with cylinder 8 that bloated nail the in circular cone top of two semi-cone angle arranged among Fig. 4-2.
Claims (8)
1. crab-bolt, contain anchor pole and sleeve pipe, be provided with the inverted cone section at the anchor pole fastener head, on inverted cone section top retention mechanism is arranged, be provided with one or one or more in the diametric(al) of the expanding end of anchor pole and sleeve pipe and have the dilatation joint or the expansion slot of certain-length, it is characterized in that: described anchor pole and sleeve pipe are provided with the threaded engagement section, and the step pipeline section of a breach greater than semicircle arranged in the sleeve pipe termination of fastening end.
2. crab-bolt according to claim 1, it is characterized in that: the expanding end that sleeve pipe cooperates with anchor pole is provided with dilatation joint or the expansion slot more than three or three, expanding end at anchor pole has chamfering, is provided with intersection dilatation joint or the expansion slot that two or more has certain-length in the approximate diameter direction of cross section.
3. crab-bolt according to claim 1 is characterized in that: casing length does not have and anchor pole dilatation joint or the socket of expansion slot section, and the dilatation joint of described anchor pole or expansion slot length section diameter are littler than thread segment.
4. according to the described crab-bolt of arbitrary claim in the claim 1～3, it is characterized in that: the anchor pole retention mechanism is the equilateral triangle projection, or is the square projection, or is the regular pentagon projection, or is the regular hexagon projection.
5. reinforced concrete structure external anchor steel reinforcement means that utilizes the described crab-bolt of claim 1, it is characterized in that: at the reinforced concrete structure external surface, designing requirement according to reinforcing, press certain regularity of distribution at a certain distance respectively in the grid of steel bars through hole and the concrete structure blind hole of reinforcing prefabricated mutual coupling on grid of steel bars and the concrete structure relevant position, bloated nail in top and described crab-bolt are installed in the hole of mating mutually, tighten described crab-bolt, the bloated nail in described top inserts described crab-bolt afterbody gradually, described crab-bolt afterbody is expanded to tighten up, after expanding, described crab-bolt afterbody makes the described casing expandable of this one, grid of steel bars is anchored at the reinforced concrete structure external surface, realize concrete structural member reinforcing, and anchoring from beam central authorities simultaneously to the both sides anchoring of progressively constructing.
6. reinforced concrete structure external anchor steel reinforcement means according to claim 5, it is characterized in that: reinforcing grid of steel bars width is between 10～30cm, crab-bolt 2～4 row, crab-bolt between the different rows is similar to quincunx layouting, avoid on the same parallel lines of the horizontal direction of same grid of steel bars, arranging two or two above crab-bolts, with distance between the two adjacent crab-bolts of delegation between 20～100cm.
7. according to claim 5 or 6 described reinforced concrete structure external anchor steel reinforcement means, it is characterized in that: the crab-bolt diameter is φ 8～φ 14, crab-bolt length is 8～10 times of crab-bolt diameters, the crab-bolt diameter hour is got higher multiple, get low multiple when the crab-bolt diameter is big, crab-bolt is apart from the edge 2～3cm of reinforcing grid of steel bars, and in the reinforcing of concrete floor, distance should be less than 2 times of reinforcement anchor steel grid of steel bars width between the two adjacent grid of steel bars.
8. reinforced concrete structure external anchor steel reinforcement means according to claim 7, it is characterized in that: in 2/3 scope of the length overall L in the middle of reinforcing grid of steel bars, be less than or equal to 10～20% of L with the distance between the adjacent crab-bolt of delegation's two-phase, in the 1/6 length overall L scope of reinforcing the grid of steel bars two ends, the shearing resistance of each crab-bolt is greater than the design stretching resistance of grid of steel bars, and satisfy the design stretching resistance of the design shearing resistance of following relationship formula: 0.8n * each crab-bolt greater than grid of steel bars, wherein n is the crab-bolt number in the grid of steel bars one end 1/6 length overall L scope.
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| CNB2005100173514A CN100347390C (en) | 2005-01-31 | 2005-01-31 | External anchor steel reinforcing method for anchor bolt and reinforced concrete structure |
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| CNB2005100173514A CN100347390C (en) | 2005-01-31 | 2005-01-31 | External anchor steel reinforcing method for anchor bolt and reinforced concrete structure |
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| CN100347390C true CN100347390C (en) | 2007-11-07 |
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| CN101942902B (en) * | 2009-07-09 | 2012-04-25 | 北京公科固桥技术有限公司 | Prestressed high-strength steel wire mesh anchorage device |
| CN102094492B (en) * | 2010-12-30 | 2012-03-14 | 东莞欧博建材科技有限公司 | Anchoring bar-planting rod capable of keeping center fixed, balanced and expanded |
| CN103953374B (en) * | 2014-05-13 | 2016-09-07 | 铜陵有色金属集团铜冠矿山建设股份有限公司 | A kind of shaft construction prepackage borehole wall hangs the installation method of interim geomantic omen pipeline Special anchor rod |
| WO2019210968A1 (en) | 2018-05-04 | 2019-11-07 | B.T. Innovation Gmbh | Transverse force anchor |
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| CN2545416Y (en) * | 2002-04-12 | 2003-04-16 | 陈国齐 | Flat head expansion screw |
| CN1176293C (en) * | 2003-06-13 | 2004-11-17 | 郑州长建工程技术开发有限公司 | Steel plate externally-rived stengthening method for reinforced concrete structure and its special-purpose rivet |
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2005
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| CN2545416Y (en) * | 2002-04-12 | 2003-04-16 | 陈国齐 | Flat head expansion screw |
| CN1176293C (en) * | 2003-06-13 | 2004-11-17 | 郑州长建工程技术开发有限公司 | Steel plate externally-rived stengthening method for reinforced concrete structure and its special-purpose rivet |
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Also Published As
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|---|---|
| CN1657720A (en) | 2005-08-24 |
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