CN101275432A - Construction method for building postposition pre-buried wall connecting parts - Google Patents
Construction method for building postposition pre-buried wall connecting parts Download PDFInfo
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- CN101275432A CN101275432A CNA2008101124186A CN200810112418A CN101275432A CN 101275432 A CN101275432 A CN 101275432A CN A2008101124186 A CNA2008101124186 A CN A2008101124186A CN 200810112418 A CN200810112418 A CN 200810112418A CN 101275432 A CN101275432 A CN 101275432A
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Abstract
The invention relates to an erection construction method for a rearmounted pre-embedded type fastener to wall, wherein a chemical anchor widely applied to steel structure and concrete is anchored on the wall or post of a building, a steel plate embedded part with a short steel pipe is fixed on the chemical anchor, and the short steel pipe on the steel plate embedded part is connected with the a scaffold wall rod. The method comprises the following steps: (1) determining the chemical anchor; (2) placing a chemical anchor position line; (3) processing outer wall surface base material; (4) drilling holes the base material; (5) cleaning the holes; (6) putting a drug tube in; (7) screwing in a screw; (8) curing; (9) pull-out testing; (10) installing a rearmounted embedded part; (11) connecting with a wall rod and (12) acceptance checking the wall rod. The method is easy to operate, the anchoring force is reliable, the construction cost is low, the efficiency is high, convenient for detaching and turnover for many times, the safe use of a scaffold and the normal use and security of the inside of a building are effectively ensured; the damage to the original building structure is little, and the method can be widely applied to a floor type scaffold higher than 24 meters in rebuilding or refitting engineering, and the anchoring of steel structure and concrete having a concrete strength less than C20.
Description
Technical field
The invention belongs to the realm of building construction, relate to a kind of adopting the erection construction method of rearmounted pre-buried type wall-connecting piece and console mode fastener steel tube scaffold in building reconstruction or the repair project.
Background technology
Company's wall construction of console mode fastener steel tube scaffold is called for short " wall-connecting piece ", generally is divided into rigidity and connects wall construction and the flexible wall construction that connects, and the wall-connecting piece of regulation is the rigidity wall-connecting piece in " building operations fastener type steel pipe scaffold technical specification of security " at present.The wall-connecting piece form that we often adopt has: it is to adopt steel pipe and structural column or body of wall to be connected and fixed that fastener type connection, welding, bolt connection etc., fastener type connect, still the company's of tearing down and reconstructing wall fastener effort of taking a lot of work repeatedly when exterior window is constructed; Being welded to connect is pre-embedded steel slab embedded part in structure, welds the wall-connecting piece steel pipe thereon, needs when still removing sever complex operation from the steel pipe weld with gas welding; It is pre-embedded bolt or do the wall connecting rod of split bolt mode at the body of wall upper drill hole structurally that bolt connects, and this kind efficiency of construction is low, the cost height, and the turnover that is not easy to wall-connecting piece is used.
As time goes by, large quantities of buildings in five sixties of China are pending reconstruction or trimming, particularly outer facade renovate engineering, should guarantee the safety of external scaffolding, satisfy the requirement of normal use of building interior and security again, the most frequently used fastener type wall-connecting piece can't adopt, and common built-in fitting also can't use in the building structure of having built, so must adopt novel built-in fitting erection construction method.
Summary of the invention
The object of the present invention is to provide a kind of erection construction method that adopts rearmounted pre-buried type wall-connecting piece and console mode fastener steel tube scaffold, it is easy and simple to handle, construction cost is low, be convenient to dismounting and repeatedly turnover use, effectively solve the erection construction problem of building scaffold in reconstruction or repair project.
The technical solution used in the present invention: a kind of erection construction method of rearmounted pre-buried type wall-connecting piece, be to be widely used in steel work and concrete chemical anchor bolts are anchored on the body of wall or column of building, the steel plate embedded part of band short steel pipes is fixed on the chemical anchor bolts, the short steel pipes on the steel plate embedded part is connected with the scaffold connecting bar by fastener; Comprise that (1) determine that chemical anchor bolts, (2) put the chemical anchor bolts position line, (3) wall face base material treatment, the boring of (4) base material, (5) cleaning boring, (6) and put into pencil, (7) and screw in screw rod, (8) curing conservation, (9) pull-out test, (10) and install that rearmounted embedded part, (11) are connected with wall connecting rod, (12) wall-connecting piece acceptance checking technology step.
Described (3) wall face base material treatment: skin face base material is handled, picked and cut a hole the dense concrete surface, the exterior wall base material will be handled the dense concrete surface.
Described (4) base material boring: punch on building concrete post or beam with impact type electric hammer punching machine, strictly observe boring aperture and drilling depth requirement.
Described (5) cleaning boring comprises that a. removes concrete break flour, blows break flour in the most hole with Compressed Gas such as air pump or inflator earlier; With hairbrush the break flour that hole Inner wall adheres to is removed then, this two step is wanted repeated multiple times, uses up break flour in the hole to greatest extent clearly; B. boring will conceal inspection totally, defectively will repeat a. operation.
Described (6) put into pencil: confirm resin flow with hand or with visual inspection, medicament is inserted at the bottom of the hole again after the affirmation; For allow in the pencil in the even distributor pipe of white particle as far as possible, adopt and rock or lucifuge place horizontal positioned a period of time; Described medicament is two compositions: i.e. the mixture of acrylic resin+curing compound, the mixing ratio by weight of its acrylic resin and curing compound is 2: 1, described curing compound is selected PIC type coatings curing compound for use, color is little yellow transparency liquid, and the glass pencil can serve as fines after pulverizing in construction.
Described (7) screw in chemical anchor bolts: the chemical anchor bolts of screw are imbedded front end and are provided with 45 degree corner cuts, and the rear end screws in hex nut, drive with electric tools and promptly stop at the bottom of screwing in the hole, and confirming has resin to rise near the aperture; Hammering rig rotating speed drives the crab-bolt rotation and stirs, and at the bottom of crab-bolt at the uniform velocity was pushed into the hole, the time was 10S ± 2S; In the time of at the bottom of chemical anchor bolts arrive the hole, stop at once stirring.
Described (8) curing conservation: unload electric tools, do not make the chemical anchor bolts body of rod move or rock before the crab-bolt resin glue solidifies, in the medicament freezing period, please don't rock screw rod or installation in advance.
Described (9) pull-out test: after resin glue solidifies, chemical bolt is carried out the non-destructive pull-out test,, repeat (4) base material drilling operating for not reaching the embedding again of requirement of strength with the pull-out test instrument; The sampling of random sampling way is adopted in the on-the-spot nondestructive test of chemical anchor bolts anti-pulling capacity, and the crab-bolt at same specification, same model, basic identical position is formed an inspection lot, extracts quantity and calculates by 1 ‰ of every batch of crab-bolt sum, and be no less than three; When nondestructive test when being defective, should take out in addition and be no less than three crab-bolts and do destructive test and judge.
Rearmounted embedded part is installed described (10) and (11) are connected with wall connecting rod: short steel pipes is welded on the steel plate embedded part, and beats anchor hole and pass on the chemical anchor bolts that are anchored at steel work and concrete structure exterior wall, fix by the nut screwing clamping of connector; Short steel pipes is connected by the wall connecting rod of fastener with console mode fastener steel tube scaffold; Fastener will contact with the binding face of steel pipe, and when fastener clamped steel pipe, the opening part minimum range was less than 5mm.
Rearmounted embedded part is installed described (10) and (11) are connected with wall connecting rod: will strengthen with the steel plate embedded part size of short steel pipes, set up the welding of suspension ring and steel plate embedded part, suspension ring are by clamp and wire rope and the unloading of scaffold drawknot.
The positive beneficial effect that the present invention had:
1. use homemade superhigh intensity chemical anchor bolts of new generation, acid and alkali-resistance, anti-aging, anchored force is reliable, and is durable lasting, low price;
2. the built-in fitting of band short steel pipes or suspension ring is fixing easy to be reliable by connector, be convenient to dismounting and repeatedly have enough to meet the need use, and recyclable utilization, save cost;
3. built-in fitting is connected with skin by single or multiple fasteners, outside works area and building interior are separated, effectively guarantee the normal use and the security of the safe in utilization and interior of building of scaffold, the civilized construction and the duration of unit in charge of construction had both been guaranteed, guaranteed the relevant benefit of Construction unit again, social benefit is good;
4. little to the original building structural damage, exterior window has all been allowed, exterior window remove is changed very convenient, save labor, and the risk that wall-connecting piece is is arbitrarily torn down and reconstructed when having reduced to change external window of building;
5. easy and simple to handle, the efficiency of construction height, make the construction of reconstruction or repair project very convenient, meet modern rapid construction requirement, at present the building in most of five sixties arrive the time limit of trimming or reconstruction, and application prospect is very extensive, can be widely used in reconstructing or repair project in console mode steel pipe scaffold highly above 24 meters, external wall has concrete structure column or beam, and concrete strength should not be lower than steel work and the concrete anchoring of C20;
6. application example of the present invention: facade trimming improvement project outside the exhibition building, Military Museum, overall floorage is 60577m
2, the height of scaffold support body is 46 meters, sets up length and reaches more than 1,000 meter, the about 33000m of outer facade area
2, it is huge to set up engineering quantity; The inner historical relic of Military Museum of the Chinese People's Revolution is numerous, and construction period each museum do not close the shop, security requirement is very high, after adopting the erection construction method of the rearmounted pre-buried type wall-connecting piece of the present invention, the safety of historical relic and normally carrying out of exhibition had both been guaranteed, make outer facade trimming construction that continuous carrying out normally arranged again, security incident does not together take place, be subjected to the consistent favorable comment of General Political Department with the Military Museum leader.
Description of drawings
Fig. 1 is a construction technology process block diagram of the present invention;
Fig. 2 is the embodiment of the invention 1 an erection construction schematic diagram;
Fig. 3 is an I portion enlarged drawing among Fig. 1;
Fig. 4 is the embodiment of the invention 2 erection construction schematic diagrames;
Fig. 5 is an II portion enlarged drawing among Fig. 4.
The specific embodiment
Consult shown in Figure 1, a kind of erection construction method of rearmounted pre-buried type wall-connecting piece, to be widely used in steel work and concrete chemical anchor bolts at present is anchored on building masonry wall or the column, the steel plate embedded part of band short steel pipes is fixed on the chemical anchor bolts, the short steel pipes on the steel plate embedded part is connected with the scaffold connecting bar by fastener; Comprise that mainly (1) determine that chemical anchor bolts, (2) put the chemical anchor bolts position line, (3) wall face base material treatment, the boring of (4) base material, (5) cleaning boring, (6) and put into pencil, (7) and screw in screw rod, (8) curing conservation, (9) pull-out test, (10) processing steps such as rearmounted embedded part, (11) are connected with wall connecting rod, (12) wall-connecting piece examination are installed, wherein
(1) determines chemical anchor bolts
According to data such as the actual post distances of building structure, determine the arrangement pitch of wall-connecting piece by scaffold supporting capacity designing and calculating, and then the weld bead height and the length of steel pipe or suspension ring on the quantity by calculating fastener when determining that the built-in fitting steel pipe is connected with scaffold in the wall-connecting piece, specification that built-in fitting needs chemical anchor bolts and quantity, the built-in fitting; After the chemical anchor bolts specification is determined in design, implant one group of crab-bolt at the scene on the concrete column of significant points or the beam and carry out destructive pull-out test, former design is revised by experimental data;
(2) put the chemical anchor bolts position line
Emit the chemical anchor bolts position line according to rearmounted embedded part arrangement diagram;
(3) wall face base material treatment
Skin face base material is handled, picked and cut a hole the dense concrete surface, the assurance chemical bolt can be given full play to strength advantage, and the exterior wall base material must be handled the dense concrete surface;
(4) base material boring
Punch on building concrete post or beam with impact type electric hammer punching machine, strictly observe boring aperture and drilling depth requirement; Boring aperture and drilling depth require to see the following form 1;
Table 1
Model | M8 | M10 | M12 |
Screw diameter (mm) | M8 | M10 | M12 |
Screw rod total length L (mm) | 110 | 130 | 160 |
Bore diameter DB (mm) | 10 | 12 | 14 |
Depth of burying T (mm) | 80 | 90 | 110 |
Fixture thickness Smax (mm) | 14 | 20 | 25 |
Minimum base material thickness D (mm) | 130 | 140 | 160 |
Maximum tightens torque Mp (Nm) | 10 | 20 | 40 |
Must guard boring aperture and drilling depth rigidly during boring, holing excessive or cross will make the medicament deficiency deeply; Holing shallow or holing contacts reinforcing bar, will make the anchorage depth deficiency, and two kinds of situations will reduce the bearing capacity of crab-bolt;
(5) cleaning boring
A. remove concrete break flour, earlier blow break flour in the most hole with Compressed Gas such as air pump or inflator; With hairbrush the break flour that hole Inner wall adheres to is removed then, this two step is wanted repeated multiple times, uses up break flour in the hole to greatest extent clearly; B. boring will conceal inspection totally, to the defective a. operation that repeats; In order to prevent that set intensity from reducing, thoroughly clean-out hatch Inner is floating grey because Compressed Gas can only blow in the most hole, and the very difficult break flour that the hole inwall is adhered to is removed, so it is clean to use hairbrush to remove;
(6) put into pencil
Confirm resin flow with hand or visual inspection, medicament is inserted at the bottom of the hole again after the affirmation; For easy construction and chemical anchor bolts are played one's part to the full, suggestion allows when using in the pencil in the even distributor pipe of white particle as far as possible, can adopt and rock or the method for lucifuge place horizontal positioned a period of time; Described medicament is two compositions: i.e. the mixture of acrylic resin+curing compound, the mixing ratio by weight of its acrylic resin and curing compound is 2: 1, described curing compound is selected PIC type coatings curing compound for use, color is little yellow transparency liquid, the glass pencil can serve as fines after pulverizing in construction, be equivalent to the effect of quartz sand or particle;
(7) screw in chemical anchor bolts
The chemical anchor bolts of screw are imbedded front end and are provided with 45 degree corner cuts, and the rear end screws in hex nut, and drive with electric toolss such as impact type screw rod erecting tools, air compressors and promptly to stop at the bottom of screwing in the hole, and affirmation has resin to rise near the aperture; Hammering rig rotating speed<750 rev/mins drives the crab-bolt rotation and stirs, and at the bottom of crab-bolt at the uniform velocity is pushed into the hole, the time be 10S (± 2S); In the time of at the bottom of chemical anchor bolts arrive the hole, stop at once stirring, do not do unnecessary surplus and stir action;
(8) curing conservation
Unload electric tools, do not make the chemical anchor bolts body of rod move or rock before the crab-bolt resin glue solidifies, setting time sees the following form 2;
Table 2
Temperature | Greater than 20 ℃ | 10℃-20℃ | 0℃-10℃ | -5℃-0℃ |
The crab-bolt resin glue | 10 minutes | 30 minutes | 60 |
3 hours |
In the medicament freezing period, please don't rock screw rod or installation in advance, otherwise can cause crab-bolt displacement and bearing capacity to reduce;
(9) pull-out test
After resin glue solidifies, chemical bolt is carried out the non-destructive pull-out test,, repeat (4) base material drilling operating for not reaching the embedding again of requirement of strength with the pull-out test instrument; The on-the-spot nondestructive test of chemical anchor bolts anti-pulling capacity can be adopted the sampling of random sampling way, and the crab-bolt at same specification, same model, basic identical position is formed an inspection lot, extracts quantity and calculates by 1 ‰ of every batch of crab-bolt sum, and be no less than three; When nondestructive test when being defective, should take out in addition and be no less than three crab-bolts and do destructive test and judge; Single crab-bolt design load (kN) sees the following form 3;
Table 3
Annotate: above zinc-plated screw rod requires:
A.5.8 level meets ISO-898TI;
B. minimum fracture strength .50Kg/mm
2
C. yield strength .40Kg/mm
2
D. zinc-plated thickness. minimum 5 μ m;
E. design load is pressed: zinc-plated screw rod pulling capacity safety factor 2.4-2.7, shearing force safety factor 1.4-1.5; Stainless steel screw rod pulling capacity safety factor 2.5-3.0, shearing force safety factor 1.4-1.8;
(10) rearmounted embedded part is installed
Consult Fig. 2, shown in Figure 3 simultaneously, be welded on 200 * 100 * 10mm steel plate embedded part 1 with the short steel pipes 3 with Φ 48mm, long 600mm such as oxygen-acetylene cutting equipment, puncher, welding machine, welding rod, and make a call to two anchor holes, pass on the chemical anchor bolts 2 that are anchored at steel work and concrete structure exterior wall 7, fix by the nut screwing clamping of connector 4;
(11) be connected with wall connecting rod
Consult Fig. 4, shown in Figure 5, when scaffold 6 needs local unloading, can will be with the size of the steel plate embedded part 1 of short steel pipes 3 to strengthen, be 200 * 200 * 10mm, and set up suspension ring 8 and weld with steel plate embedded part 1 with HPB235 level, Φ 18mm reinforcement fabrication, weld bead height and length determine that by calculating suspension ring 8 unload with scaffold 6 drawknots by clamp 9 and wire rope 10;
(12) wall-connecting piece is checked and accepted
A) whether inspection scaffold constructure scheme is carried out in accordance with regulations and declares and examine;
B) whether the spacing of inspection wall-connecting piece set-point is consistent with scheme with the position;
C) check whether rearmounted built-in fitting processing is qualified, the certificate of qualification of various materials;
D) check whether the rearmounted built-in fitting chemical bolt of wall-connecting piece pull-out test result is qualified, and whether the pad of chemical bolt is complete, and whether nut tightens;
E) check whether short steel pipes is consistent with scheme with the fastener number that scaffolding steel pipe connects on the rearmounted built-in fitting, and whether the fastener spacing meets the demands, and whether fastener tightens.
The material of selecting for use in the erection construction of the present invention comprises
The chemical composition of steel plate 1 and mechanical performance should meet (GB/T700) regulation of middle Q235-A level steel of national standard " structural carbon steel ", and it is the hot rolled steel plate of 8-12mm that steel plate 1 is selected thickness for use.
Welding rod 6 adopts the E43 type.
Wire rope 10 is determined the wire rope model then according to the intensity of part unloading calculating stay cord.
Claims (10)
1. the erection construction method of a rearmounted pre-buried type wall-connecting piece, it is characterized in that: be to be anchored on the body of wall or column of building being widely used in steel work and concrete chemical anchor bolts, the steel plate embedded part of band short steel pipes is fixed on the chemical anchor bolts, the short steel pipes on the steel plate embedded part is connected with the scaffold connecting bar by fastener; Comprise that (1) determine that chemical anchor bolts, (2) put the chemical anchor bolts position line, (3) wall face base material treatment, the boring of (4) base material, (5) cleaning boring, (6) and put into pencil, (7) and screw in screw rod, (8) curing conservation, (9) pull-out test, (10) and install that rearmounted embedded part, (11) are connected with wall connecting rod, (12) wall-connecting piece acceptance checking technology step.
2. the erection construction method of rearmounted pre-buried type wall-connecting piece according to claim 1, it is characterized in that described (3) wall face base material treatment: skin face base material is handled, pick and cut a hole the dense concrete surface, the exterior wall base material will be handled the dense concrete surface.
3. the erection construction method of rearmounted pre-buried type wall-connecting piece according to claim 1 is characterized in that the boring of described (4) base material: punch on building concrete post or beam with impact type electric hammer punching machine, strictly observe boring aperture and drilling depth requirement.
4. the erection construction method of rearmounted pre-buried type wall-connecting piece according to claim 1 is characterized in that described (5) cleaning boring comprises that a. removes concrete break flour, blows break flour in the most hole with Compressed Gas such as air pump or inflator earlier; With hairbrush the break flour that hole Inner wall adheres to is removed then, this two step is wanted repeated multiple times, uses up break flour in the hole to greatest extent clearly; B. boring will conceal inspection totally, defectively will repeat a. operation.
5. the erection construction method of rearmounted pre-buried type wall-connecting piece according to claim 1 is characterized in that described (6) put into pencil: confirm resin flow with hand or with visual inspection, medicament is inserted at the bottom of the hole again after the affirmation; For allow in the pencil in the even distributor pipe of white particle as far as possible, adopt and rock or lucifuge place horizontal positioned a period of time; Described medicament is the mixture of acrylic resin+curing compound, the mixing ratio by weight of its acrylic resin and curing compound is 2: 1, described curing compound is selected PIC type coatings curing compound for use, and color is little yellow transparency liquid, and the glass pencil can serve as fines after pulverizing in construction.
6. the erection construction method of rearmounted pre-buried type wall-connecting piece according to claim 1, it is characterized in that described (7) screw in chemical anchor bolts: the chemical anchor bolts of screw are imbedded front end and are provided with 45 degree corner cuts, the rear end screws in hex nut, promptly stop at the bottom of drive screwing in the hole with electric tools, confirming has resin to rise near the aperture; Hammering rig rotating speed drives the crab-bolt rotation and stirs, and at the bottom of crab-bolt at the uniform velocity was pushed into the hole, the time was 10S ± 2S; In the time of at the bottom of chemical anchor bolts arrive the hole, stop at once stirring.
7. the erection construction method of rearmounted pre-buried type wall-connecting piece according to claim 1, it is characterized in that described (8) curing conservation: unload electric tools, do not make the chemical anchor bolts body of rod move or rock before the crab-bolt resin glue solidifies, in the medicament freezing period, please don't rock screw rod or installation in advance.
8. the erection construction method of rearmounted pre-buried type wall-connecting piece according to claim 1, it is characterized in that described (9) pull-out test: after resin glue solidifies, with the pull-out test instrument chemical bolt is carried out the non-destructive pull-out test, for not reaching the embedding again of requirement of strength, repeat (4) base material drilling operating; The sampling of random sampling way is adopted in the on-the-spot nondestructive test of chemical anchor bolts anti-pulling capacity, and the crab-bolt at same specification, same model, basic identical position is formed an inspection lot, extracts quantity and calculates by 1 ‰ of every batch of crab-bolt sum, and be no less than three; When nondestructive test when being defective, should take out in addition and be no less than three crab-bolts and do destructive test and judge.
9. the erection construction method of rearmounted pre-buried type wall-connecting piece according to claim 1, it is characterized in that described (10) install rearmounted embedded part and (11) are connected with wall connecting rod: short steel pipes (3) is welded on the steel plate embedded part (1), and beat anchor hole and pass on the chemical anchor bolts (2) that are anchored at steel work and concrete structure exterior wall (7), fix by the nut screwing clamping of connector (4); Short steel pipes (3) is connected with the wall connecting rod (601) of console mode fastener steel tube scaffold (6) by fastener (5); Fastener (5) will contact with the binding face of steel pipe (3), and when fastener (5) clamped steel pipe (3), the opening part minimum range was less than 5mm.
10. the erection construction method of rearmounted pre-buried type wall-connecting piece according to claim 1, it is characterized in that described (10) install rearmounted embedded part and (11) are connected with wall connecting rod: will strengthen with steel plate embedded part (1) size of short steel pipes (3), set up suspension ring (8) and steel plate embedded part (1) welding, suspension ring (8) are by clamp (9) and wire rope (10) and the unloading of scaffold (6) drawknot.
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