CN104652288A - Construction system of cast-in-situ large-tonnage box girder for soft soil foundation and construction method - Google Patents
Construction system of cast-in-situ large-tonnage box girder for soft soil foundation and construction method Download PDFInfo
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- CN104652288A CN104652288A CN201510100360.3A CN201510100360A CN104652288A CN 104652288 A CN104652288 A CN 104652288A CN 201510100360 A CN201510100360 A CN 201510100360A CN 104652288 A CN104652288 A CN 104652288A
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Abstract
The invention discloses a construction system of a cast-in-situ large-tonnage box girder for a soft soil foundation. The construction system comprises a support pile part, a scaffold and a prefabricated beam formwork, wherein the support pile part comprises a plurality of support piles, diagonal bridgings, a support framework and square timbers, the support piles are punched into the natural soft soil foundation in an array way, each diagonal bridging is arranged at the exposing bottom part of the corresponding support pile, the support framework is fixedly arranged at the top parts of the support piles, the square timbers are paved on the support framework to form a platform, the scaffold is built on the platform, and the prefabricated beam formwork is arranged on the scaffold. The invention also discloses a construction method. The construction method has the advantages that the construction system is suitable for the soft soil area, and the occasions with higher requirements on foundation settlement amount and safety of the bridge support system when the construction is performed near operation lines, the conventional knowledge of the field is broken, the support pile system and the scaffold system are combined, the construction problem of the soft soil foundation is solved, the operability is high, the safety and rapidity are realized, and the cost is low.
Description
Technical field
The present invention relates to technical field of bridge construction, particularly relate to construction system and the framework method of the cast-in-place large-tonnage box beam of a kind of soft foundation.
Background technology
The construction of current Cast-in-situ Beam mainly adopts Support Method and MSS method construction, Support Method and MSS method major advantage be operation sequencing, do not need large-scale lifting appliance, haulage device, the good integrity of bridge span structure; Shortcoming is long in time limit, and rolled steel dosage is large, mechanization degree is low, and material easily lacks, and when bridge is higher, safety reduces, and there are certain requirements, costly to geological conditions and bearing capacity.The feature that the construction work common demands duration is short, cost is low, so just on the basis of developing Support Method and MSS method technological advantage, must overcome the bottleneck of duration and cost, realization can guarantee high-quality fast and safe construction, can realize maximizing the benefits again.
Summary of the invention
The object of the invention is the technological deficiency for existing in prior art, and construction system and the framework method of the cast-in-place large-tonnage box beam of a kind of soft foundation are provided.
The technical scheme adopted for realizing object of the present invention is:
The construction system of the cast-in-place large-tonnage box beam of a kind of soft foundation, comprise supporting pile portion, scaffold and moulding board of precast beam, described supporting pile portion comprises multiple supporting pile squeezing into original state soft foundation in arranged in arrays, be arranged on the bridging that supporting pile exposes bottom surface portions, be fixedly installed on the support frame at supporting pile top and be laid on described support frame and form the lumps of wood of platform, described scaffold building is on platform, and described moulding board of precast beam frame stands in scaffold.
Described supporting pile is steel pipe pile or castinplace pile.
The i iron welding that described support frame is arranged by transverse and longitudinal is formed.
Described scaffold is full hall total sub-semigroup.
The platform both sides formed at the described lumps of wood are provided with railing.
The height of described platform with the flying height at case beam position to be onstructed different and stepped distribution with the structure height to reduce scaffold.
A framework method for construction system, is characterized in that, comprises the following steps,
1) supporting pile erection step: execute stake by preset pitch, in the supporting pile portion of exposing with row, diagonal brace is set to form bridging, be welded with vertical reinforcement dividing plate to improve bonding strength under pile cover simultaneously,
2) platform construction step: set gradually respectively Boulez in length and breadth at supporting pile top and i iron in top-bottom layout to form support frame, then lay lumps of wood formation platform on the support frame, then carry out platform precompressed test;
3) scaffold erection step: after platform precompressed is completed on platform erecting scaffold, then carry out precompressed Road test;
4) moulding board of precast beam erection step: arranging moulding board of precast beam after precompressed Road test on scaffold can carry out pouring construction.
Described step 3) in, scaffold step pitch 0.6m, cross bar spacing 0.6 × 0.6m, the web place being greater than 4m in deck-molding is encrypted, cross bar spacing is 0.6 × 0.3m, and bridging is set up with support and synchronously carried out, bridging spacing 3 meters in length and breadth, when scaffold height is greater than 6 meters, if 3 road horizontal cross braces.
Described step 3) in, prefabricating load adopts fiber packeted soil, crane lifting is in place to be realized, during precompressed, load mainly concentrates on the end, web position, carry out according to 50%, 100%, 120% classification of support body load, in loading procedure, adopt level gauge implement the deformation of round-the-clock tracking observation scaffold and make a record, treat that scaffold no longer sedimentation occurs, prefabricating load process terminates.
Compared with prior art, the invention has the beneficial effects as follows:
The occasion that construction system of the present invention is higher to settlement of foundation requirement, higher to the security requirement of supporting bridge system when being applicable to soft clay area and closing on Business Line construction, break through the conventional cognitive of this area, supporting pile system and scaffold system are combined, overcome the construction problem of soft foundation, workable, safe, quick, with low cost.
Accompanying drawing explanation
Figure 1 shows that construction system side structure schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
When bridge construction, execution conditions are complicated, as, closing on business railway side dressing man-hour, if when construction area has pond, a river, the soft foundation of the construction that brings inconvenience, existing construction system cost is high, and efficiency of construction is low, and the present invention carries out exemplary illustrated as example.
As shown in Figure 1, the construction system of the cast-in-place large-tonnage box beam of soft foundation of the present invention comprises supporting pile portion, scaffold and moulding board of precast beam, described supporting pile portion comprises the supporting pile 1 squeezing into original state soft foundation in matrix arrangements, and described supporting pile is steel pipe pile 11 or castinplace pile 12.Be arranged on the bridging 2 that supporting pile exposes bottom surface portions, be fixedly installed on the support frame 3 at supporting pile top and be laid on described support frame and form the lumps of wood 4 of platform, described scaffold 5, as full hall total sub-semigroup, set up on platform, described moulding board of precast beam frame stands in scaffold.The i iron welding that described support frame is arranged by transverse and longitudinal is formed.The platform both sides formed at the described lumps of wood are provided with railing.
Construction system main body of the present invention comprises supporting pile portion and scaffold and template system from bottom to top.The combined system Main Function of supporting pile portion and scaffold is bearing load, supporting pile portion comprises the stake support system of castinplace pile and steel pipe pile formation, transverse and longitudinal steel I-beam is seated at the support frame that supporting pile top forms cross grid formation, support frame completely spreads the platform of lumps of wood composition, supporting pile structure is simple, the soft base of weak soil need not do any basement process original state can squeeze into steel pipe pile, easy construction, cost can be reduced, economize on resources, reduction of erection time, simultaneously supporting pile not free settling and distortion influenced hardly to rainy season construction, supporting pile, especially steel pipe pile exposed parts uses not only rigidity large as whole support system, good stability, and reduce support height, safety improves greatly, guarantee to close on running railway line construction safely and reliably, meanwhile, each operation does not interfere with each other can parallel operations, improve efficiency of construction, the reduction of erection time, material consumption is little, turnover is convenient, construction cost is low, for the T-shaped firm structure swivel bridges of latitude road, Tianjin four 2*73 gross weight 1.552 ten thousand tons, across the busy trunk railway in Tianjin to the Shanhai Pass on this bridge, mountain, present situation Tianjin, bridge location place railway is two strands of railways, the long 68*2=136m of rotating body beam rotating part, bridge floor is wide is 28m, and base plate is wide is gradual change type, and the narrowest section is 1687.3cm at pier top core width, the widest section is 1914cm at beam body tip width, and mean breadth is 1800cm.Frange plate width is 3700cm.Beam body concrete adopts C55 concrete, and concrete amounts to 4172m3.Facts have proved that steel pipe pile turns case beam than setting up Support Method after basement process cost-saving about 500,000 yuan with cast-in-place this of scaffold combined support system.
The framework method of construction system comprises the following steps,
1) supporting pile erection step: execute stake by preset pitch, in the supporting pile portion of exposing with row, diagonal brace is set to form bridging, under pile cover, be welded with vertical reinforcement dividing plate to improve bonding strength simultaneously, specifically, close Existing operating railway side is castinplace pile, all the other are steel pipe pile, and vertical horizontal spacing is 3.0m.Steel pipe pile underground length 22m, some areas are the longest is 23.0m, welds 20 channel-section steels and will be linked to be entirety with row's steel pipe pile as diagonal brace after steel pipe pile construction, reinforcement dividing plate is welded with under pile cover, wherein all weld seams all adopt E4303 welding rod, full weld, paste that falsework slippage is high must not be less than 8mm.
2) platform construction step: set gradually respectively Boulez in length and breadth at supporting pile top and i iron in top-bottom layout to form support frame, then lay lumps of wood formation platform on the support frame; Specifically, 60cm steel pipe pile laterally lays 36b i iron side by side, and spacing is 3.0m.Longitudinal 36b i iron laid by horizontal i iron, spacing is 80cm, namely the 3b i iron of layout forms support frame in length and breadth, then on longitudinal i iron, lay laterally 20 × 20cm lumps of wood form platform, railing is provided with in platform both sides, railing adopts Φ 40 common steel tube to make, and the every 1.5m of railing arranges one column.
3) scaffold erection step: erecting scaffold on platform, scaffold step pitch 0.6m, cross bar spacing 0.6 × 0.6m, the web place being greater than 4m in deck-molding is encrypted, cross bar spacing is 0.6 × 0.3m, and bridging is set up with support and synchronously carried out, bridging spacing 3 meters in length and breadth, when scaffold height is greater than 6 meters, if 3 road horizontal cross braces.Then precompressed Road test is carried out; Prefabricating load adopts fiber packeted soil, crane lifting is in place to be realized, during precompressed, load mainly concentrates on the end, web position, carry out according to 50%, 100%, 120% classification of support body load, in loading procedure, adopt level gauge implement the deformation of round-the-clock tracking observation scaffold and make a record, treat that scaffold no longer sedimentation occurs, prefabricating load process terminates.Carrying out in ballast construction, limit to carry out ballast, the deformation of limit observation scaffold, notes abnormalities and should stop ballast operation immediately, search reason in time, carries out ballast again after process is normal.
4) moulding board of precast beam erection step: arranging moulding board of precast beam after precompressed Road test on scaffold can carry out pouring construction.
Wherein, bearing capacity of single pile test should be done before steel pipe pile construction, can construction steel pile tube and scaffold system when steel pipe pile reaches that when embedded depth reaches design length, bearing capacity of single pile meets design requirement, after platform construction, precompressed is also had to test with the stability improving total system for platform.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. the construction system of the cast-in-place large-tonnage box beam of soft foundation, it is characterized in that, comprise supporting pile portion, scaffold and moulding board of precast beam, described supporting pile portion comprises multiple supporting pile squeezing into original state soft foundation in arranged in arrays, be arranged on the bridging that supporting pile exposes bottom surface portions, be fixedly installed on the support frame at supporting pile top and be laid on described support frame and form the lumps of wood of platform, described scaffold building is on platform, and described moulding board of precast beam frame stands in scaffold.
2. construction system as claimed in claim 1, it is characterized in that, described supporting pile is steel pipe pile or castinplace pile.
3. construction system as claimed in claim 1, is characterized in that, the i iron welding that described support frame is arranged by transverse and longitudinal is formed.
4. construction system as claimed in claim 1, is characterized in that, described scaffold is full hall total sub-semigroup.
5. construction system as claimed in claim 1, is characterized in that, the platform both sides formed at the described lumps of wood are provided with railing.
6. construction system as claimed in claim 1, is characterized in that, the height of described platform with the flying height at case beam position to be onstructed different and stepped distribution with the structure height to reduce scaffold.
7. a framework method for the construction system as described in any one of claim 1-6, is characterized in that, comprises the following steps,
1) supporting pile erection step: execute stake by preset pitch, in the supporting pile portion of exposing with row, diagonal brace is set to form bridging, be welded with vertical reinforcement dividing plate to improve bonding strength under pile cover simultaneously,
2) platform construction step: set gradually respectively Boulez in length and breadth at supporting pile top and i iron in top-bottom layout to form support frame, then lay lumps of wood formation platform on the support frame, then carry out platform precompressed test;
3) scaffold erection step: after platform precompressed is completed on platform erecting scaffold, then carry out precompressed Road test;
4) moulding board of precast beam erection step: arranging moulding board of precast beam after precompressed Road test on scaffold can carry out pouring construction.
8. framework method as claimed in claim 7, it is characterized in that, described step 3) in, scaffold step pitch 0.6m, cross bar spacing 0.6 × 0.6m, the web place being greater than 4m in deck-molding is encrypted, cross bar spacing is 0.6 × 0.3m, and bridging is set up with support and synchronously carried out, bridging spacing 3 meters in length and breadth, when scaffold height is greater than 6 meters, if 3 road horizontal cross braces.
9. framework method as claimed in claim 7, it is characterized in that, described step 3) in, prefabricating load adopts fiber packeted soil, and crane lifting is in place to be realized, and during precompressed, load mainly concentrates on the end, web position, carry out according to 50%, 100%, 120% classification of support body load, in loading procedure, adopt level gauge implement the deformation of round-the-clock tracking observation scaffold and make a record, treat that scaffold no longer sedimentation occurs, prefabricating load process terminates.
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| CN201510100360.3A CN104652288A (en) | 2015-03-06 | 2015-03-06 | Construction system of cast-in-situ large-tonnage box girder for soft soil foundation and construction method |
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| CN201510100360.3A CN104652288A (en) | 2015-03-06 | 2015-03-06 | Construction system of cast-in-situ large-tonnage box girder for soft soil foundation and construction method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108978500A (en) * | 2018-06-25 | 2018-12-11 | 德州市公路工程总公司 | Wide-span case beam cantilever assembly prestress composite carrier system and construction method |
| CN108999085A (en) * | 2018-07-20 | 2018-12-14 | 浙江交工宏途交通建设有限公司 | Sea area construction of cast-in-situ box-beam bracket and sea area construction of cast-in-situ box-beam method |
| CN109306663A (en) * | 2018-11-01 | 2019-02-05 | 江苏中路工程技术研究院有限公司 | A kind of extremely frigid zones Full space support construction method |
| CN110160489A (en) * | 2018-02-10 | 2019-08-23 | 中铁十局集团第三建设有限公司 | A kind of Cast-in-situ Beam pre-pressing bracket Fibre Optical Sensor settlement automatic monitoring method |
| CN111691450A (en) * | 2020-06-17 | 2020-09-22 | 无锡市航道工程有限公司 | Concrete construction process for top beam plate of high-pile beam plate type wharf |
| CN115142398A (en) * | 2022-07-20 | 2022-10-04 | 宁波交通工程建设集团有限公司 | Construction method for cast-in-situ box girder by firstly solidifying and then building full-space support in sea area beach area |
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| CN102733307A (en) * | 2012-06-18 | 2012-10-17 | 中铁三局集团有限公司 | Method for constructing cast-in-place beam falsework |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110160489A (en) * | 2018-02-10 | 2019-08-23 | 中铁十局集团第三建设有限公司 | A kind of Cast-in-situ Beam pre-pressing bracket Fibre Optical Sensor settlement automatic monitoring method |
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| CN108999085A (en) * | 2018-07-20 | 2018-12-14 | 浙江交工宏途交通建设有限公司 | Sea area construction of cast-in-situ box-beam bracket and sea area construction of cast-in-situ box-beam method |
| CN109306663A (en) * | 2018-11-01 | 2019-02-05 | 江苏中路工程技术研究院有限公司 | A kind of extremely frigid zones Full space support construction method |
| CN111691450A (en) * | 2020-06-17 | 2020-09-22 | 无锡市航道工程有限公司 | Concrete construction process for top beam plate of high-pile beam plate type wharf |
| CN115142398A (en) * | 2022-07-20 | 2022-10-04 | 宁波交通工程建设集团有限公司 | Construction method for cast-in-situ box girder by firstly solidifying and then building full-space support in sea area beach area |
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Application publication date: 20150527 |