CN104631332A - Prestressed concrete T-shaped beam on-site prefabricating erection construction method - Google Patents
Prestressed concrete T-shaped beam on-site prefabricating erection construction method Download PDFInfo
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- CN104631332A CN104631332A CN201510021908.5A CN201510021908A CN104631332A CN 104631332 A CN104631332 A CN 104631332A CN 201510021908 A CN201510021908 A CN 201510021908A CN 104631332 A CN104631332 A CN 104631332A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention relates to a prestressed concrete T-shaped beam on-site prefabricating erection construction method and belongs to the technical field of bridge construction. The method comprises the steps that after bridge abutments on two shores are constructed, a T-shaped beam prefabrication site is arranged between the bridge abutments on the two shores; T-shaped beam construction is carried out on the T-shaped beam prefabrication site; the T-shaped beam prefabrication site is dismounted, and a riverway is recovered; after the riverway is recovered, beam falling construction is carried out, and then wet joint and bridge surface construction are finished. Compared with a conventional prefabrication site prefabricating constriction method, the prestressed concrete T-shaped beam on-site prefabricating erection construction method reduces workloads and expenses of construction of the prefabrication site and avoids usage of a large hoisting transportation device; compared with a movable formwork construction mode, the prestressed concrete T-shaped beam on-site prefabricating erection construction method avoids investment of a large movable formwork, lowers the construction cost and reduces the construction difficulty; compared with a cast-in-situ support construction mode, the prestressed concrete T-shaped beam on-site prefabricating erection construction method reduces the workloads, lowers the construction cost, and avoids the influence of prestressed stretching and drawing on a bracket. The prestressed concrete T-shaped beam on-site prefabricating erection construction method is especially suitable for backland bridge construction with construction sites limited.
Description
Technical field
The present invention relates to a kind of PC T beam precast erection construction method, belong to technical field of bridge construction.
Background technology
Current concrete T-shaped beam extensively adopts prefabricated and cast-in-place two kinds of construction methods.Wherein Mid and minor spans Reinforced Concrete Simple T beam bridge can adopt poured-in-place to construct, and PC T beam adopts fabrication and erection construction.It is prefabricated prefabricated with MSS method that prefabrication system mainly contains precasting yard.Precasting yard prefabricated construction needs comparatively open prefabricated place and large-scale lifting and Transport Machinery, costly; The equipment that MSS method adopts is heavy construction equipment, is mainly used in large bridges, very uneconomical for small bridge engineering.
Summary of the invention
Technical problem to be solved by this invention is: a kind of PC T beam precast erection construction method providing easy construction, economical rationality.
For solving the problems of the technologies described above the technical solution adopted in the present invention be: PC T beam precast erection construction method, step is:
After a, build two sides abutment, the beam prefabricated place of T is set between the abutment of two sides;
B, carry out the construction of T beam in the beam prefabricated place of T;
C, the dismounting beam prefabricated place of T, recover river course;
After d, river course recover, the beam that falls is constructed, and then completes wet seam and Roadway Construction.
Be further, the beam prefabricated field construction method of T described in step a is: backfill river course, then adopts concrete to harden, as the beam prefabricated place of T after sclerosis on surface, backfill place, if river course has current to pass through, in backfill layer, pre-buried pipe culvert is used as overcurrent.
Further, the beam prefabricated field construction method of the T described in step a is: set up floor stand, arranges Bailey beam form platform, using described platform as the beam prefabricated place of T at the pre-buried bracket of abutment abutment body.
Further, the T beam construction sequence described in step b is:
Abutment is provided with bearing pad stone, builds pedestal in bearing pad stone corresponding position, and pedestal is located on the beam prefabricated place of T, and lays temporary formwork on bearing pad stone;
Carry out laying and fixing of template, reinforcing bar, bellows and steel strand;
The concreting of T beam;
Apply T girder pre-stressed;
Slip casting, maintenance.
Be further, the beam construction method that falls described in steps d is: be placed in by two jack below T beam-ends diaphragm, synchronization of jacking up T beam, after T beam raises, take out the temporary formwork on bearing pad stone, put into bearing, T beam is slowly placed on bearing by adjustment jack, successively each T beam is lowered into bearing end face, makes the T beam of full-bridge all drop down onto design altitude, complete beam construction.
The invention has the beneficial effects as follows: compared with the precasting yard prefabricated construction of routine, decrease workload and the expense of prefabricated place construction itself, avoid the use of Large-scale Hoisting haulage device; Compared with Construction Through Form on Traveler, avoid and drop into large-scale mobile formwork, saved construction cost, reduced difficulty of construction; Compared with constructing with cast-in-place support, decrease engineering quantity, save construction cost, avoid the impact of prestressed stretch-draw on bearing.It is limited that the present invention is particularly useful for construction plant, the backland bridge construction of bridge site.
Accompanying drawing explanation
Fig. 1 is elevation of the present invention;
Fig. 2 is plan view of the present invention;
Fig. 3 is the A-A view of Fig. 1;
Fig. 4 be of the present invention fall beam construction schematic diagram;
Mark in figure: the beam prefabricated place of 1-abutment, 2-T, 3-bearing pad stone, 4-pedestal, 5-T beam, 6-pipe culvert, 7-temporary formwork, 8-wet seam, 9-bridge floor, 10-jack, 11-bearing.
Detailed description of the invention
For ease of understanding and implementing the present invention, the preferred embodiments of the present invention are selected to be described further.
As shown in Figure 1 to 4, the PC T beam precast erection construction method described in the present embodiment, step is:
After a, build two sides abutment 1, the beam prefabricated place 2 of T is set between two sides abutment 1;
B, carry out T beam 5 in the beam prefabricated place 2 of T and construct;
C, the dismounting beam prefabricated place 2 of T, recover river course;
After d, river course recover, the beam that falls construction, then completes wet seam 8 and bridge floor 9 is constructed.
For the construction method in the beam prefabricated place 2 of the T described in step a, the present embodiment provides two kinds of embodiments, a kind of embodiment is: backfill river course, then concrete is adopted to harden on surface, backfill place, as the beam prefabricated place 2 of T after sclerosis, the present invention preferably constructs in river course dry season, convenient construction, when construction period river course have current by time, in backfill layer, pre-buried pipe culvert 6 is used as overcurrent.During river course backfill, can gather materials on the spot at bridge site place, adopt sand boulder and cobble layered rolling to certain altitude, then C20 concrete thick for backfill surface, place 150mm is hardened.Adopt this kind of embodiment, when the recovery river course described in step c, excavator can be adopted to remove the beam prefabricated place of T, answer the excavator operator that selection technique is skilled during dismounting, and send special messenger's hand transceiver auxiliary observation, encounter T beam beam sheet to prevent excavator.
Another kind of embodiment is: set up floor stand, arranges Bailey beam form platform, using described platform as the beam prefabricated place 2 of T at the pre-buried bracket of abutment abutment body.
For the T beam construction method described in step b, the step of preferred embodiment is: abutment 1 is provided with bearing pad stone 3, builds pedestal 4 in bearing pad stone 3 corresponding position, and pedestal 4 is located on the beam prefabricated place 2 of T, and lays temporary formwork 7 on bearing pad stone 3; Carry out laying and fixing of template, reinforcing bar, bellows and steel strand; The concreting of T beam 5; Apply T girder pre-stressed; Slip casting, maintenance.
Wherein, pedestal 4 can adopt C25 concrete, it is linear consistent with at the bottom of the beam of T beam 5, bearing 11 elevation of top surface height 20mm ~ 40mm that the temporary formwork 7 elevation ratio construction later stage is arranged, pedestal 4 width is less than design width at the bottom of the beam of T beam 5, is preferably 8mm ~ 12mm less of design width at the bottom of beam, to rise mode coefficient to offset concrete, reserved tie rod hole in pedestal 4, and antiarch is set in span centre position, other positions are pressed second-degree parabola and are distributed.
For falsework construction, because T beam 5 is prefabricated at bridge location place, template carries out installation and removal by by the wet joint gap between beam sheet, and wooden form and a dead lift mode can be adopted to install and remove.During construction, at pedestal end face coating release agent to replace bed die; Side form is made up of bamboo slab rubber side plate and lumps of wood vertical levels rib, and side template adopts three layers of split bolt to fix; End mould is formed primarily of the end plates being close to T beam anchor plate, connects into entirety with side form; Support is made up of diagonal brace and vertical support; Template ribbing and stent support spacing are by calculate or experience is determined.When considering later stage of the present invention erection beam sheet, need with both sides, jack brace summer sheet termination, therefore by outer for side bar end diaphragm how prefabricated half block diaphragm.
For steel strand processing, determine steel wire length according to anchor clamp thickness, jack length, cold stretch long value, elastical retraction value, elongation value of stretching and the protruded length calculating that orifice throat length and the scene of drawing are selected.
For reinforcing bar binding and pipe built-in, pedestal 4 carry out setting-out to reinforcement location and makes marks, first arranging colligation " water chestnut " reinforcing bar; Secondly colligation web reinforcement, setting-out bellows spacer bars, reinforcement welding is firm; Again, penetrate bellows, be welded fixing reinforced steel bar ring; Finally, colligation T beam-ends head reinforcing bar and laying top board wing plate reinforcing bar.
Install for anchor plate, the mouth that is in the milk during installation should be positioned at top, is beneficial to later stage benefit slurry; Anchor plate must ensure vertical with duct, to meet design requirement; Anchor plate horn mouth and junction, duct plastic adhesive tape tightly swathe, and enter slurry to prevent pipeline; When Side Template is installed, with positioning bolt, anchor plate is reliably fixed in template.
For steel strands-woven bundle and lashing, during steel strands-woven bundle, must not twist together, and ensure that same steel bundle numbering is consistent.During lashing, by parcels such as steel strand termination cement bag papers, steel bundle swathes at interval of a segment distance adhesive plaster, and to ensure its globality, preferably swathing spacing is 1m ~ 1.5m.
For the concrete pouring construction of T beam 5, T beam 5 can adopt C50 concrete, and concreting adopts horizontal slice to build, and every layer thickness is not more than 30cm, and build order longitudinally for from one end to the other side, vertical order is first " water chestnut ", then web, last wing plate.Monolithic beam continuous placing, one-shot forming.Concretely vibrate based on attached vibrator, vibrator is auxiliary as a plug.
Girder pre-stressed for applying T, design 3 bundle steel strand for every sheet T beam 5 in the present embodiment, its tension sequence is 100%N1-50%N2-100%N3-100%N2.Initial stress gets 10% of control stress for prestressing, calculates value of thrust according to the control stress for prestressing in plan.Tension of prestressed tendon can adopt vertically-displacable double-action jack, and the specified stretching force of jack should select 1.5 ~ 2.0 times of required stretching force, but must not be less than 1.2 times, oil meter matching used with jack, and its full-scale reading is preferably 1.5 ~ 2.0 times of stretching force.
During Shi Hanzhang, prestressed stretch-draw with Stress Control, elongation indicator proofread.The difference of actual elongation value and theoretic elongation need control within ± 6%, otherwise suspends stretch-draw, after ascertaining the reason and take measures to be adjusted, then continues stretch-draw.
During prestressed stretch-draw, first should eliminate the relaxed state of steel strand, can first adjust to 10% of stretching control force, in order to eliminate the relaxed state of steel strand, now can standardized mark be as stretch value reference point on steel strand, and it is fricton-tight to check that steel wire has.Continue stretch-draw until control stress for prestressing, hold lotus certain hour, be preferably 4min ~ 5min, when stress to be controlled is under stable state, carry out anchoring.After stretch-draw terminates, with the lumps of wood, T beam both sides are supported respectively.During the invention process, prestressing force is pulled on pedestal 4 and carries out, and avoids the impact of prestressed stretch-draw on bearing 11.
After prestressed stretch-draw anchor, clear up pipeline, cutting ground tackle front end steel strand, shutoff work anchor periphery gap, carries out mud jacking operation afterwards.Slurries can adopt 42.5 grades of Portland cements and grouting agent formulated.The pressure of mud jacking is preferably 0.5 ~ 0.7Mpa, and it is full and have underflow to emerge that the fullness degree of mud jacking reaches the duct other end, and after the grout outlet that overflows, pressurize a period of time again, be preferably the 0.5Mpa stationary phase of 4min ~ 5min, after mud jacking terminates, carry out sealing off and covering anchorage by design drawing central sill section size.After slip casting test specimen reaches design strength, carry out step c.
As shown in Figure 4, for the beam construction method that falls described in steps d, preferred embodiment is: be placed in by two jack 10 below T beam 5 end diaphragm, after synchronization of jacking up T beam 5, T beam 5 raises, take out the temporary formwork 7 on bearing pad stone 3, put into bearing 11, T beam 5 is slowly placed on bearing 11 by adjustment jack 10, successively each T beam 5 is lowered into bearing 11 end face, make the T beam 5 of full-bridge all drop down onto design altitude, complete beam construction.The beam that falls construction adopts jack 10, can ensure beam process stabilization, and easy to use, does not need to adopt Large-scale Hoisting haulage device.Jack 10 preferred mechanical jack.
When wet seam 8 and bridge floor 9 are constructed, hanging basket method can be adopted to carry out diaphragm model sheetinstallat and reinforcing bar binding, colligation is afterwards wet seam reinforcing bar, finally builds wet seam and diaphragm concrete.
Claims (5)
1. PC T beam precast erection construction method, is characterized in that, step is:
After a, build two sides abutment (1), the beam prefabricated place of T (2) is set between two sides abutment (1);
B, to carry out T beam (5) construction in the beam prefabricated place of T (2);
C, the dismounting beam prefabricated place of T (2), recover river course;
After d, river course recover, the beam that falls is constructed, and then completes wet seam (8) and bridge floor (9) construction.
2. PC T beam precast erection construction method as claimed in claim 1, it is characterized in that, the beam prefabricated place of T described in step a (2) construction method is: backfill river course, then concrete is adopted to harden on surface, backfill place, as the beam prefabricated place of T after sclerosis, if river course has current to pass through, in backfill layer, pre-buried pipe culvert (6) is as overcurrent.
3. PC T beam precast erection construction method as claimed in claim 1, it is characterized in that, the beam prefabricated place of T described in step a (2) construction method is: set up floor stand, Bailey beam is set at abutment abutment body pre-buried bracket and forms platform, using described platform as the beam prefabricated place of T.
4. the PC T beam precast erection construction method according to any one of claims 1 to 3 item, is characterized in that, the T beam construction sequence described in step b is:
Described abutment (1) is provided with bearing pad stone (3), pedestal (4) is built in bearing pad stone (3) corresponding position, pedestal (4) is located on the beam prefabricated place of T (2), and on bearing pad stone, lay temporary formwork (7);
Carry out laying and fixing of template, reinforcing bar, bellows and steel strand;
The concreting of T beam (5);
Apply T girder pre-stressed;
Slip casting, maintenance.
5. PC T beam precast erection construction method as claimed in claim 4, it is characterized in that, the beam construction method that falls described in steps d is: two jack (10) be placed in below T beam (5) end diaphragm, synchronization of jacking up T beam (5), after T beam (5) raises, take out the temporary formwork (7) on bearing pad stone (3), put into bearing (11), T beam (5) is slowly placed on bearing (11) by adjustment jack (10), successively each T beam (5) is lowered into bearing (11) end face, the T beam (5) of full-bridge is made all to drop down onto design altitude, complete beam construction.
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| CN201510021908.5A CN104631332B (en) | 2015-01-16 | 2015-01-16 | PC T beam precast erection construction method |
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| CN201510021908.5A CN104631332B (en) | 2015-01-16 | 2015-01-16 | PC T beam precast erection construction method |
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| CN104631332B CN104631332B (en) | 2016-08-24 |
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Cited By (6)
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| CN105803943A (en) * | 2016-03-11 | 2016-07-27 | 重庆建工市政交通工程有限责任公司 | Large longitudinal slope T-shaped beam prefabricating construction method |
| CN106012847A (en) * | 2016-05-27 | 2016-10-12 | 中交四公局第二工程有限公司 | Bailey frame support precast hollow slab process |
| CN107090777A (en) * | 2017-06-02 | 2017-08-25 | 国家电网公司 | A kind of T beam manufacture methods for reducing blibbing |
| CN110374012A (en) * | 2019-07-24 | 2019-10-25 | 中铁七局集团路桥工程有限公司 | A kind of prefabricated engineering method of T beam original position Support Method |
| CN111319118A (en) * | 2020-02-27 | 2020-06-23 | 中交二公局第四工程有限公司 | Prefabrication construction method of box girder in plateau valley bridge construction |
| CN111395178A (en) * | 2020-03-25 | 2020-07-10 | 中电建十一局工程有限公司 | Single-span 40m long prestressed T beam construction method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803943A (en) * | 2016-03-11 | 2016-07-27 | 重庆建工市政交通工程有限责任公司 | Large longitudinal slope T-shaped beam prefabricating construction method |
| CN105803943B (en) * | 2016-03-11 | 2017-10-03 | 重庆建工市政交通工程有限责任公司 | The T-shaped beam prefabricated construction method of big longitudinal slope |
| CN106012847A (en) * | 2016-05-27 | 2016-10-12 | 中交四公局第二工程有限公司 | Bailey frame support precast hollow slab process |
| CN106012847B (en) * | 2016-05-27 | 2018-01-02 | 中交四公局第二工程有限公司 | Bailey bracket supports precast hollow slab technique |
| CN107090777A (en) * | 2017-06-02 | 2017-08-25 | 国家电网公司 | A kind of T beam manufacture methods for reducing blibbing |
| CN110374012A (en) * | 2019-07-24 | 2019-10-25 | 中铁七局集团路桥工程有限公司 | A kind of prefabricated engineering method of T beam original position Support Method |
| CN111319118A (en) * | 2020-02-27 | 2020-06-23 | 中交二公局第四工程有限公司 | Prefabrication construction method of box girder in plateau valley bridge construction |
| CN111395178A (en) * | 2020-03-25 | 2020-07-10 | 中电建十一局工程有限公司 | Single-span 40m long prestressed T beam construction method |
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