CN102691268A - Stretching construction process of super-long prestressed tendon - Google Patents
Stretching construction process of super-long prestressed tendon Download PDFInfo
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- CN102691268A CN102691268A CN2012101913573A CN201210191357A CN102691268A CN 102691268 A CN102691268 A CN 102691268A CN 2012101913573 A CN2012101913573 A CN 2012101913573A CN 201210191357 A CN201210191357 A CN 201210191357A CN 102691268 A CN102691268 A CN 102691268A
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Abstract
The invention discloses a stretching construction process of a super-long prestressed tendon. The stretching construction process comprises the steps of: (a) preparation before the stretching of the prestressed tendon; (b) approach check of materials; (c) installation of prestressed pipelines, wherein pre-embedded bellows forming is adopted; (d) blanking and penetration of the prestressed tendon; (e) component checking and cleaning before the stretching of the prestressed tendon; (f) stretching construction of the prestressed tendon: accurately testing the coefficient of friction resistance of the pipelines and calculating the theoretical stretching value of the prestressed tendon; (g) grouting construction; and (h) end sealing. According to the invention, each process of positioning, the penetration and the stretching construction of the super-long prestressed tendon is effectively controlled to ensure that the designed stretching force is accurately applied on a girder body during the construction, and the durability, the safety, the rigidity and the vector arch height of a box girder are guaranteed.
Description
Technical field
The present invention relates to the job practices of the prestressed reinforced concrete construction of bridge engineering, relate to a kind of super-length prestressed steel bundle tension construction technology especially.
Background technology
Domestic research to prestressed concrete started to walk since the fifties, 1956, had built up first prestressed concrete simply supported girder bridge of striding footpath 20m, existing so far nearly 60 years development course.After 1976, China's prestressing force bridge development is very fast, has all obtained breakthrough in bridge type, span and job practices and technical elements, has the technology of building of many Prestressed Concrete Bridges to obtain good international fame.Along with the quickening of Urbanization in China, municipal bridge develops towards the super-long and super-wide direction.On the continuous cast-in-situ box girder history of prestressed concrete, single steel strand length is really belonging to exception more than 150 meters at home, because its perpendicular curved, flat curved amplitude is bigger, location, lashing and the stretch-draw of steel bundle is caused very big difficulty.
Summary of the invention
In order to overcome above-mentioned deficiency, the object of the invention can put on the beam body with the design stretching force when being to provide a kind of construction exactly, the durability of guard box beam, safety, rigidity and vow the super-length prestressed steel bundle tension construction technology of the pitch of arch.
To achieve these goals, the technical scheme of the present invention's employing is that a kind of super-length prestressed steel bundle tension construction technology comprises step:
(a) preparation before the prestressed strand stretch-draw, supporting the selecting for use and the strict blanking of verification, steel bundle that comprises tensioning equipment;
(b) materials arrival check comprises that prestressed strand destroys load, surrender load, elongation rate and modulus of elasticity and relaxation test, and ground tackle and anchor clamps carry out hardness and static load anchoring qualitative experiment;
(c) prestress pipe is installed, and said prestress pipe adopts pre-buried bellows to be shaped, and the non-prestressed steel bundle of the installation of said prestress pipe and case beam is constructed simultaneously;
(d) prestressed strand blanking and lashing,, the lashing of said prestressed strand adopts the artificial strand pulling machine that cooperates to carry out;
(e) inspection of the member before the prestressed strand stretch-draw and cleaning;
(f) prestressed strand stretching construction; Said tensioning construction step comprises that (fa) will design stretching force and be applied to the beam body; (fb) on-site measurement duct frictional resistance value; (fc) calculate the duct coefficient of friction resistance according to said duct frictional resistance value, (fd) calculate the prestressed strand mean stress, (fe) go out the prestressed strand theoretic elongation according to the average calculation of Prestress of said prestressed strand according to the said duct coefficient of friction resistance;
(g) mud jacking construction, said mud jacking sequence of construction is for getting on, get off;
(h) end-blocking.
Preferably, the said bellows in the said step (c) is the galvanized metal bellows, and the spreading of said bellows adopts junction block, and the two ends of said bellows are wrapped up in the sealant tape envelope.
Preferably, the length of said junction block is more than or equal to 25 centimetres.
Preferably, said bellows is provided with steam vent, and said steam vent is arranged on the peak of said bellows.
Preferably, the cutting length of the said prestressed strand in the said step (d) is controlled within the 10mm, and the abrasive cutoff saw cutting is adopted in the blanking of said prestressed strand.
Preferably, the inspection of the member before the said prestressed strand stretch-draw in the said step (e) specifically comprises the inspection to concrete component, anchor plate and position, duct etc.; Cleaning before the said prestressed strand stretch-draw specifically comprises the inside and outside inspection that waits of anchor plate horn mouth.
Preferably, on-site measurement duct frictional resistance value specifically comprises step described in the said step (f): (ka) simultaneously oil-filled behind the two ends of the beam dress jack, keep certain numerical value; (kb) first end sealing, the second end stretch-draw; The stretch-draw time stage boosts, until control stress for prestressing; Carry out so repeatedly, get the average of pressure at two ends difference; (kc) by (kb) said method, but the sealing of second end, the average of pressure at two ends difference is got in the first end stretch-draw; (kd) above-mentioned twice pressure differential average is average once more, be the measured value of duct frictional resistance.
Preferably, the said mud jacking in the said step (g) is from mixing system cement to beginning to hole path pressure grouting, and the time must not be above 30 minutes.
Preferably, the water/binder ratio of the said mud jacking in the said step (g) is 0.4-0.45.
Preferably, the said end-blocking of said step (h) specifically comprises (ha) back-end crop portion prestressed strand; (hb) seal anchor ring and steel bundle; (hc) fixed sealing Side Template; (hd) build the end-blocking concrete
Beneficial effect of the present invention: the present invention passes through the effective control to each operation of location, lashing and the stretching construction of super-length prestressed steel bundle; To design stretching force when guaranteeing to construct exactly and put on the beam body, the durability of guard box beam, safety, rigidity and the arrow pitch of arch.
Description of drawings
Fig. 1 is a super-length prestressed steel bundle tension construction technology of the present invention.
Fig. 2 is a corrugated pipe connector sketch map of the present invention.
Fig. 3 is that steam vent of the present invention is kept somewhere sketch map.
Among the figure, the 1-bellows; The 2-junction block; The 3-sealant tape; The 4-plastic pipe; The 5-iron wire is tightened; The 6-foam-rubber cushion; 7-plastics arc pressuring plate.
The specific embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention, makes of the present invention above-mentioned and other purposes, characteristic and advantage are more clear.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly proportionally do not draw accompanying drawing, focus on showing purport of the present invention.
Below in conjunction with Fig. 1 to Fig. 3 super-length prestressed steel bundle tension construction technology of the present invention is elaborated.
Wherein, Fig. 1 is a super-length prestressed steel bundle tension construction technology of the present invention, and Fig. 2 is a corrugated pipe connector sketch map of the present invention, and Fig. 3 is that steam vent of the present invention is kept somewhere sketch map.
As shown in Figure 1, super-length prestressed steel bundle tension construction technology of the present invention comprises:
(a) preparation before the prestressed strand stretch-draw
Preparation before the prestressed strand stretch-draw mainly comprises tensioning equipment supporting selecting for use and the strict blanking of verification, steel strand.Tensioning equipment mainly comprises jack, pressure meter, oil pump, pneumatic mortar machine, Abrasive cutting off machine, mortar lorry mounted mixer and on-the-spot Weighing utensil etc.
(b) materials arrival check
Press a batch extraction specimen test before the prestressed strand blanking.With the same trade mark, same heat (batch) number, same specification, same production technology, with the prestressed strand of the condition of delivery, every 60t is a collection of, and not enough 60t is also by a collection of.Destroy load, surrender load, elongation rate and modulus of elasticity and relaxation test.Prestressed strand is with ground tackle, when anchor clamps are marched into the arena, by batch carrying out visual inspection and extracting test specimen and do hardness and the test of static load anchoring property.Prestressed strand and anchor plate product quality certificate are complete
(c) prestress pipe is installed
(c1) prestress pipe adopts pre-buried galvanized metal bellows 1 to be shaped.The bellows outward appearance keeps clean, and surfaces externally and internally does not have greasy dirt, does not have the attachment that causes corrosion, and no hole and irregular wrinkle, seaming do not have cracking, do not have and thread off.As shown in Figure 2, the spreading of bellows 1 adopts junction block 2, takes over length >=25cm of 2, and the two ends of bellows 1 are wrapped up in sealant tape 3 envelopes, in case the joint spillage; Arrange the special messenger to make regular check on, pinpointing the problems in time to handle prevents bellows 1 spillage.
(c2) in the non-prestressed steel bundle construction of case beam, carry out the piping laying and the location work of prestressed strand.Prestressed pipeline network for location at first, network for location is worn bellows then according to drawing design accurately location, welding U type location steel bundle, and last U shaped steel bundle seals and is welded into groined type steel bundle net.Every pipeline network for location longitudinal pitch is not more than 1m, suitably encrypts 0.5m in prestressed strand vertical curve section.Be provided with in steel beam bending section simultaneously and prevent collapsing the steel bundle, along bridge together, locate the steel bundle and prevent that collapsing the steel bundle must restraint firm welding with Liang Tigang, to guarantee the prestress pipe accurate positioning to spacing 20cm.
Guarantee to manage interior no-sundries when (c3) bellows is installed, the pipeline open-mouth adopts the sealant tape shutoff.As shown in Figure 3, laterally reach vertical bellows steam vent need be set, be arranged on the bellows peak.Earlier above bellows 1, open a circular hole, the plastic presser plate 7 with the band mouth on opening covers with foam-rubber cushion 6, and is fixed on the bellows 1 with iron wire; The joint periphery is obturaged with adhesive tape; In case spillage connects plastic pipe 4 on the mouth of plastic presser plate 7, extend upward to beam face top.
(c4) constructor must not step on and spoil or knock with instrument, and discovery bellows local distortion is in time changed processing;
(c5) bellows when conflicting with ordinary constitution steel bundle, suitably is shifted the ordinary steel bundle under the prerequisite that technician and designer agree at the scene when mounted, and is accurate to guarantee position, bellows duct;
Bellows will be away from electric welding when (c6) installing, and in time change or swathes leakproof with sealant tape;
(c7) two ends are installed anchor plate and are strengthened spiral bar, and are fixed by the specification of every kind of ground tackle, and anchor plate will be fixedly mounted on the template of termination, backing plate will with the strict centering in duct, and vertical with the end, duct, can not misplace.
(d) prestressed strand blanking and lashing
(d1) depositing of prestressed strand should have rainproof measure, can not be placed directly in mire or air storage, in case get rusty;
(d2) press design drawing, cutting length error during the prestressed strand blanking: steel strand are controlled at ± 10mm in;
(d3) the abrasive cutoff saw cutting is adopted in the prestressed strand blanking, thread ties with pricking in advance at 5cm place, the both sides of otch, and otch is loose after preventing to cut, and the chock plate or the lumps of wood below the steel strand of following honest material prevent that earth from making dirty;
(d4) the prestressed strand lashing adopts the artificial steel strand strand pulling machine that cooperates to carry out lashing, guarantees steel Shu Shunzhi, does not twist together, and during lashing, the steel strand head overlaps oval steel bushing, in order to avoid injure bellows,
Want the scrutiny radical after whole bundle is put on, and the steel strand that will expose wrap up with plastic adhesive tape, prevent to get rusty;
(d5) before the concreting bellows is carried out strictness checks comprehensively; Comprise coordinate position, line style, bent radius and sealing, in concrete placement, note protecting bellows; The constructor must not arbitrarily step on and spoil; Can not bump bellows with vibrating spear, prevent pipe shifted or pipeline spillage, stop concreting when finding spillage immediately;
(e) inspection of the member before the prestressed strand stretch-draw and cleaning
(e1) must test to concrete component before the prestressed strand stretch-draw, 90% and the length of time that stretch-draw case beam concrete strength requires to reach design strength must not be less than 7 days;
(e2) inspection anchor plate and position, duct before the prestressed strand stretch-draw guarantee that design size is accurate; Grout hole and steam vent position meet code requirement, and the duct should be unimpeded, the welding slag on removing ground tackle, the backing plate contact plate face, concrete residue etc.;
(e3) prestressed strand stretch-draw is preceding rejects unnecessary bellows with cleaning out inside and outside the anchor plate horn mouth, installation work anchor and intermediate plate, and seal operation anchor and backing plate hold out against intermediate plate;
(e4) grasp the direction that the beam body elasticity is out of shape before the prestressed strand stretch-draw, whether inspection template and support have the place of restained beam body deformability, such as removing side form, remove the bearing lock.
(f) prestressed strand stretching construction
1. tension stress
Adjust to initial stress
earlier; Wherein
gets 15% of proof stress value σ con, begin again by
15% σ con ~ 30% σ con ~ 100 σ con stretch-draw and measurement stretch value.
The actual stretch value of prestressed strand is:
ΔL=ΔL1+ΔL2
In the formula:
Δ L-prestressing force stretch value;
Δ L1-from the actual measurement elongation between initial stress to maximum tension stress;
Stretch value during Δ L2-initial stress adopts the elongation of adjacent level.
2. control stretching force
Prestressed strand stretch-draw end stretching force is calculated as follows:
In the formula:
-prestressing tendon steel strand radical;
3. prestressed strand mean stress
The prestressed strand mean stress is calculated as follows:
In the formula:
-average stretching force (unit is N);
Equal stretching force (unit is KN) is held in
-stretch-draw level with both hands;
The angle sum of
-duct corner and tangent line (unit is rad);
The friction factor of
-prestressed strand and cell walls; Get 0.20～0.25, need do the frictional resistance test and confirm.
4. duct frictional resistance test:
When measuring curve duct frictional resistance with jack, testing procedure is following:
(ka) two ends of beam dress jack (not adorning work anchor) back is simultaneously oil-filled, keeps certain numerical value;
(kb) first end sealing, the second end stretch-draw.The stretch-draw time stage boosts, until control stress for prestressing.Carry out so repeatedly, get the average of pressure at two ends difference;
(kc) by (kb) said method, but the sealing of second end, the average of pressure at two ends difference is got in the first end stretch-draw;
(kd) above-mentioned twice pressure differential average is average once more, be the measured value of duct frictional resistance.
The frictional resistance measured value is Pc; Then:
calculates
value according to formula.
5. prestressed strand design theory stretch value
Prestressed strand design theory stretch value is calculated as follows:
In the formula:
6. stretch-draw points for attention:
(6a) during stretch-draw, should make the jack position consistent with the dead in line of prestress wire;
(6b) steel strand fracture of wire and stripped thread control number: every bundle steel bundle fracture of wire, stripped thread number allow 1 at most, and every section fracture of wire sum is no more than 1% of this section steel wire sum;
(6c) timely retraction and the anchor deformation value of measuring steel strand after the stretch-draw, the compliant requirement is if surpass stretch-draw again or change ground tackle.
(g) mud jacking construction
(g1) after stretch-draw is accomplished steel wire gap and hole around the ground tackle are filled out envelope, in case spillage;
(g2) mix of cement paste should at first be added on water in the mixing machine, puts into cement again, fully after the mix; Add admixture again; Moisture in the admixture is accrued goes in the water/binder ratio, mixes and stirs at least two minutes till reaching uniform denseness, and any once batching is answered in 45 minutes and used up;
(g3) adopt during mud jacking order from bottom to top to carry out, from mixing system cement to beginning to hole path pressure grouting, the time must not surpass 30 minutes, and in course of exerting pressure frequent agitate water mud;
(g4) duct mud jacking as early as possible after the stretch-draw must be rinsed the duct well before the mud jacking, moistening, uses hair-dryer if any ponding and gets rid of;
(g5) the mud jacking water/binder ratio should adopt 0.4-0.45;
(g6) mud jacking gets on, get off in proper order, answers two holes mud jacking simultaneously as finding the string hole;
(g7) the mud jacking operation should once must not carry out slowly, evenly, continuously and interrupted guaranteeing that hole path pressure grouting is full, closely knit; It is full with pulp and till should reaching the steam vent discharge cement paste identical with the regulation denseness that mud jacking should reach the duct other end; For guaranteeing to be full of mortar should keep being not less than 0.5Mpa after closing grout outlet a voltage stabilizing phase in the bellows, this time voltage stabilizing phase is no less than 2 minutes;
(g8) pressed the slurry stock inlet to seal, solidified up to cement paste, all stoppers, valve etc. all must not move or open;
(g9) the closely knit situation of mud jacking should be spot-check behind the mud jacking from inspection eye, the pressure ftercompction should be in time improved like leakiness.
(h) end-blocking
(h1) back-end crop portion steel strand: mud jacking cuts the unnecessary steel strand that expose outside anchor ring 30-50mm after accomplishing with Abrasive cutting off machine;
(h2) immediately the beam-ends cement paste is rinsed well after hole path pressure grouting finishes, is removed the concrete dirt of bearing plate, ground tackle and end face simultaneously, and with end face concrete chisel hair in order to building the end-blocking concrete;
(h3) press design drawing colligation sealing off and covering anchorage end steel bundle, seal anchor ring and steel strand by the figure paper size;
(h4) end face steel bundle net is set and is the fixing position of steel bundle net, can part stirrup point be welded on the bearing plate;
(h5) the fixed sealing Side Template in case when concreting template walk about and influence beam length.Check beam body total length behind the formwork erection, its length should meet the regulation of allowable variation;
To carefully operate and conscientiously vibrate when (h6) building the end-blocking concrete, guarantee the concrete compaction at ground tackle place.
The present invention passes through the effective control to each operation of location, lashing and the stretching construction of super-length prestressed steel bundle, will design stretching force when guaranteeing to construct exactly and put on the beam body, the durability of guard box beam, safety, rigidity and the arrow pitch of arch.
In above description, a lot of details have been set forth so that make much of the present invention; But with foregoing description only is preferred embodiment of the present invention; The present invention can implement much to be different from other modes described here, so the present invention does not receive the restriction of top disclosed specific embodiment.Any those of ordinary skill in the art are not breaking away under the technical scheme scope situation of the present invention simultaneously; All the method for above-mentioned announcement capable of using and technology contents are made many possible changes and modification to technical scheme of the present invention, or are revised as the equivalent embodiment of equivalent variations.Every content that does not break away from technical scheme of the present invention, all still belongs in the scope of technical scheme protection of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. super-length prestressed steel bundle tension construction technology is characterized in that: comprise step:
(a) preparation before the prestressed strand stretch-draw, supporting the selecting for use and the strict blanking of verification, steel bundle that comprises tensioning equipment;
(b) materials arrival check comprises that prestressed strand destroys load, surrender load, elongation rate and modulus of elasticity and relaxation test, and ground tackle and anchor clamps carry out hardness and static load anchoring qualitative experiment;
(c) prestress pipe is installed, and said prestress pipe adopts pre-buried bellows to be shaped, and the non-prestressed steel bundle of the installation of said prestress pipe and case beam is constructed simultaneously;
(d) prestressed strand blanking and lashing,, the lashing of said prestressed strand adopts the artificial strand pulling machine that cooperates to carry out;
(e) inspection of the member before the prestressed strand stretch-draw and cleaning;
(f) prestressed strand stretching construction; Said tensioning construction step comprises that (fa) will design stretching force and be applied to the beam body; (fb) on-site measurement duct frictional resistance value; (fc) calculate the duct coefficient of friction resistance according to said duct frictional resistance value, (fd) calculate the prestressed strand mean stress, (fe) go out the prestressed strand theoretic elongation according to the average calculation of Prestress of said prestressed strand according to the said duct coefficient of friction resistance;
(g) mud jacking construction, said mud jacking sequence of construction is for getting on, get off;
(h) end-blocking.
2. super-length prestressed steel bundle tension construction technology according to claim 1; It is characterized in that: the said bellows in the said step (c) is the galvanized metal bellows; The spreading of said bellows adopts junction block, and the two ends of said bellows are wrapped up in the sealant tape envelope.
3. super-length prestressed steel bundle tension construction technology according to claim 2, it is characterized in that: the length of said junction block is more than or equal to 25 centimetres.
4. super-length prestressed steel bundle tension construction technology according to claim 2, it is characterized in that: said bellows is provided with steam vent, and said steam vent is arranged on the peak of said bellows.
5. super-length prestressed steel bundle tension construction technology according to claim 1, it is characterized in that: the cutting length of the said prestressed strand in the said step (d) is controlled within the 10mm, and the abrasive cutoff saw cutting is adopted in the blanking of said prestressed strand.
6. super-length prestressed steel bundle tension construction technology according to claim 1 is characterized in that: the member inspection before the said prestressed strand stretch-draw in the said step (e) specifically comprises the inspection to concrete component, anchor plate and position, duct etc.; Cleaning before the said prestressed strand stretch-draw specifically comprises the inside and outside inspection that waits of anchor plate horn mouth.
7. super-length prestressed steel bundle tension construction technology according to claim 1, it is characterized in that: on-site measurement duct frictional resistance value specifically comprises step described in the said step (f): (ka) simultaneously oil-filled behind the two ends of the beam dress jack, keep certain numerical value; (kb) first end sealing, the second end stretch-draw; The stretch-draw time stage boosts, until control stress for prestressing; Carry out so repeatedly, get the average of pressure at two ends difference; (kc) by (kb) said method, but the sealing of second end, the average of pressure at two ends difference is got in the first end stretch-draw; (kd) above-mentioned twice pressure differential average is average once more, be the measured value of duct frictional resistance.
8. super-length prestressed steel bundle tension construction technology according to claim 1 is characterized in that: the said mud jacking in the said step (g) is from mixing system cement to beginning to hole path pressure grouting, and the time must not be above 30 minutes.
9. super-length prestressed steel bundle tension construction technology according to claim 1, it is characterized in that: the water/binder ratio of the said mud jacking in the said step (g) is 0.4-0.45.
10. super-length prestressed steel bundle tension construction technology according to claim 1 is characterized in that: the said end-blocking of said step (h) specifically comprises (ha) back-end crop portion prestressed strand; (hb) seal anchor ring and steel bundle; (hc) fixed sealing Side Template; (hd) build the end-blocking concrete.
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| CN104532754A (en) * | 2015-01-13 | 2015-04-22 | 中铁二局股份有限公司 | Prestress concrete box girder end sealing formwork construction method |
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| CN113403952A (en) * | 2021-06-25 | 2021-09-17 | 中铁十二局集团有限公司 | Railway continuous beam prestress construction method |
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| CN102864747A (en) * | 2012-10-26 | 2013-01-09 | 上海市城市建设设计研究总院 | Method for constructing ultra-altitude-difference/overlength/extra-large-tonnage prestress steel beam |
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| CN104532754B (en) * | 2015-01-13 | 2016-04-20 | 中铁二局工程有限公司 | A kind of prestressed concrete box girder end-blocking template construction method |
| CN107724239A (en) * | 2017-09-14 | 2018-02-23 | 中铁十九局集团第二工程有限公司 | Super-length prestressed beam construction method |
| CN112049027A (en) * | 2020-09-04 | 2020-12-08 | 上海市机械施工集团有限公司 | Remediation method for prestressed duct |
| CN113403952A (en) * | 2021-06-25 | 2021-09-17 | 中铁十二局集团有限公司 | Railway continuous beam prestress construction method |
| CN113585091A (en) * | 2021-09-02 | 2021-11-02 | 中铁北京工程局集团第二工程有限公司 | Construction method of super-long prestressed steel beam |
| CN114395985A (en) * | 2022-01-22 | 2022-04-26 | 湖南路桥建设集团有限责任公司 | Concrete prestressed pipeline mud jacking exhaust hole structure and construction method thereof |
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Application publication date: 20120926 |