CN101982611B - Jack symmetric precompaction construction method for hanging basket girders for bridge hanging basket suspension casting construction - Google Patents
Jack symmetric precompaction construction method for hanging basket girders for bridge hanging basket suspension casting construction Download PDFInfo
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- CN101982611B CN101982611B CN2010105158653A CN201010515865A CN101982611B CN 101982611 B CN101982611 B CN 101982611B CN 2010105158653 A CN2010105158653 A CN 2010105158653A CN 201010515865 A CN201010515865 A CN 201010515865A CN 101982611 B CN101982611 B CN 101982611B
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Abstract
The invention relates to a jack symmetric precompaction construction method for hanging basket girders for bridge hanging basket suspension casting construction. The method comprises the following ten steps: 1, selecting a precompaction field; 2, assembling the hanging basket girders; 3, symmetrically putting the two hanging basket girders on four wood pads; 4, prefixing rear anchor points; 5, assembling a middle fulcrum point block; 6, mounting a hanging basket loading system; 7, measuring the relative position size of the two hanging basket girders before loading; 8, loading and measuring the relative position size of the two hanging basket girders; 9, unloading and measuring the relative position size of the two hanging basket girders; and 10, calculating and analyzing according to measurement data. The method has the advantages that the precompaction on bridge can be substituted, thus heavy workload for suspending sandbags can be avoided; the precompaction work efficiency is effectively quickened so as to save massive precompaction construction time; load can be applied by the jack, and precompaction data can be accurately controlled; and the precompaction process and observation process of the hanging basket are performed in the field with high safety and strong controllability.
Description
Technical field
The invention belongs to technical field of bridge construction, be specifically related to the Hanging Basket purlin sheet that bridge Hanging Basket cantilever casting construction is used.
Background technology
Along with the continuous development of bridge engineering construction, different types of rridges form of structure is more and more, and the Hanging Basket cantilever casting construction also obtains more applications as using more a kind of job practices.In the Hanging Basket cantilever casting construction, Hanging Basket is a kind of working measure member of indispensability, during construction; Hanging Basket rear end anchor is in the concrete-bridge section of having built; Fulcrum props up and stands on the concrete beam-ends of having built, and front end is hung bed die, side form and the internal mold of treating the casting beams section, forms the concreting condition.Along with each beam section concrete is built, Hanging Basket is progressively pushed ahead construction.The Hanging Basket pattern is various, and the spelling Hanging Basket etc. of light-duty Hanging Basket (comprising triangle and prismatic), Bei Lei purlin or the universal rod body structure of shaped steel processing is arranged.Every kind of Hanging Basket must wait and carry or surcharge preloading before using first, and to reach the purpose of check Hanging Basket: whether crudy meets the demands; Whether each node can meet the demands; Eliminate nonelastic deformation; Measure the checking elastic deformation.Precompressed mode commonly used at present is with the Hanging Basket that processes; After processing space is accomplished the examination assembly, lift to bridge floor case beam 0# section top and install, carry out piling prepressing at back; Generally all adopt heap sand bag or retaining; Adopt this kind precompressed mode, have following shortcoming, construction is impacted: 1, workload is big on the bridge.Because prefabricating load carries or surcharge preloading for waiting, the prefabricating load of general every cover Hanging Basket weighs more than the 200t, needs handling, loading and unloading sandbag 200t, and labour intensity is big, and wants strict control, and machinery and manpower consumption are very big.And a width of cloth Hanging Basket is made up of two triangle hanging basket purlin sheets, during precompressed, needs the unbalanced weight on control both sides to control difficulty greater than 5t.2, cause claim for eot.Existing engineering is all strict to construction period, and adopts the bridge of cradle construction, the residing construction environment of pier stud relatively poor (or high pier or border on the river or mountain stream), and load needs 5～8 days in the precompressed, 7 days precompressed phases, unload 2～3 days, cleaned 1 day.Influencing the duration reaches 15 days, even longer.3, precompressed Data Control is inaccurate.No matter be to adopt sand pocket or retaining precompressed, on the weight of load all can not accurately control, though can play the effect of eliminating nonelastic deformation, can accurately not measure the elastic deformation value.4, difficult to the distortion and the observation of node everywhere.Hanging Basket is after installing on the bridge, in the precompressed process, to the deformation observation of the deformation observation of Hanging Basket and the node inspection of all need climbing, observation difficulty and dangerous.5, traditional precompressed is work high above the ground, has greater risk on the safety.Just in case design, processing or the material of Hanging Basket purlin sheet are off quality, perhaps preloading surpasses design load, all might cause toppling of Hanging Basket system, leads to great safe mass accident.
Summary of the invention
For the problems that the Hanging Basket precompressed that solves above-mentioned existing heap sand bag or retaining exists, realize that precompressed work can not take time duration in the completion of processing place; Load applies by jack and provides, and load applies soon, removes fast; Safe, can accurately control load through the oil meter reading; The present invention provides the jack symmetry precompressed job practices of a kind of bridge Hanging Basket cantilever casting construction with Hanging Basket purlin sheet.
The technical solution that realizes above-mentioned purpose is following:
Bridge Hanging Basket cantilever casting construction is comprised web member 3, cross bar 1, short brace 2,4 four main rod members of long diagonal brace with the jack symmetry precompressed job practices of Hanging Basket purlin sheet by the triangle Hanging Basket purlin sheet of precompressed, and the back anchor point of Hanging Basket purlin sheet is provided with two bolts hole side by side; Loading end is provided with two loading bolt holes side by side, and diameter of bolt hole is 35mm, and spacing is 300mm, it is characterized in that: concrete precompressed operation may further comprise the steps:
(1) selects the above precompressed place of area 15m * 15m, smooth compacting precompressed place;
(2) part web member 3, cross bar 1, short brace 2, long diagonal brace 4 are assembled into two identical triangle Hanging Basket purlin sheets;
(3) cross bar 1 with two Hanging Basket purlin sheets is relative, and symmetry is placed on 4 chocks 11; The back anchor point of two Hanging Basket purlin sheets and loading end are placed on respectively wherein on two chocks 11, and the triangle end of the two place Hanging Basket purlin sheet relative with cross bar 1 is placed on respectively in addition on two chocks 11; Through being employed in the height of 4 chocks 11 of method adjustment of squeezing into or extract timber wedge on the chock 11, guarantee that two Hanging Basket purlin sheets all are in level, wherein the spacing a=160mm between the cross bar 1 of two Hanging Basket purlin sheets;
(4) the back anchor point pre-fixes
Corresponding two bolts hole of the back anchor point of two Hanging Basket purlin sheets are realized the preliminary of anchor point behind two Hanging Basket purlin sheets fixed respectively by bolt;
(5) central bearing point is installed
Steel central bearing point piece 10 is installed between the web member 3 of two Hanging Basket purlin sheets and cross bar 1 node location;
(6) the Hanging Basket loading system is installed
Be provided with two bolts 5 in the corresponding loading bolt of the loading end hole of two Hanging Basket purlin sheets; The lateral surface of the loading end of two Hanging Basket purlin sheets is respectively equipped with power transmission distribution member 7; And both sides power transmission distribution member 7 all is set on the bolt 5; Be provided with jack 8 between the cross bar 1 of the power transmission distribution member 7 of one side and Hanging Basket purlin sheet, tightening nuts 6 is installed on bolt 5 ends;
(7) measure the physical dimension that loads preceding Hanging Basket purlin sheet, the position that reaches loading end, back anchor point concerns size, carries out record;
(8) pass through high-pressure oil pump 9 to jack 8 fuel feeding, hierarchical loading, 0t is pressed in classification; 10t, 20t, 30t; Five ranks of 40t accurately measure Hanging Basket purlin each node deformation data of sheet simultaneously, i.e. distance between the cross bar 1 of the distance between the cross bar 1 of Hanging Basket purlin, load(ing) point place sheet, anchor point place, back Hanging Basket purlin sheet; And each rod member and node place conscientiously observed, observe whether tangible loss on transmission is bad, especially the change in displacement situation of load(ing) point, back anchor point;
(9) control high-pressure oil pump 9 oil returns, jack 8 load sheddings, 40t is pressed in classification, 30t, 20t, 10t, five ranks of 0t; Measure the change in displacement of load(ing) point, back anchor point simultaneously, promptly the distance between the cross bar 1 of the distance between the cross bar 1 of Hanging Basket purlin, load(ing) point place sheet, anchor point place, back Hanging Basket purlin sheet is observed the stressed situation of change of node;
(10) according to measuring the gained data; Calculating elastic distortion, nonelastic deformation and the comparative analysis of design theory value; Draw Hanging Basket purlin sheet precompressed conclusion: can Hanging Basket satisfy the demand, the concrete data of elastic deformation, nonelastic deformation, and whether each main rod member and node satisfy the intensity needs.
Said power transmission distribution member 7 comprises vertical web 13 and the cross web more than two 12 that right-angled intersection distributes that be that has been respectively equipped with booster action between 15, two blocks of frange plates 15 of two blocks of frange plates; On cross web 12 and vertical web 13 junctions, two blocks of frange plates 15, be laid with the bolt hole 14 of two perforations; Spacing between every block of frange plate 15 long and wide 630mm and the 160mm of being respectively, two blocks of frange plates 15 is 180mm.
The cross sectional dimensions of said chock 11 is 15cm * 15cm, and length is 180cm.
Said jack 8 is the hydraulic jack of 60 tonnages.
The present invention's useful technique effect compared with prior art is embodied in the advantage of following several respects:
1, anchor point, central bearing point, load(ing) point can substitute precompressed on the bridge fully all by the simulation of cradle structure duty behind the present invention; Avoided precompressed work on the bridge.Avoided in traditional precompressed construction the hard work amount of handling sandbag.
2, in processing place precompressed, effectively accelerate the precompressed operating efficiency, saved the precompressed engineering time in a large number.
3, adopt the jack load application, the precompressed data are accurately controlled.Reach the precompressed purpose fully, and draw construction control and adjustment that data are convenient to the step.
4, can be to distortion and node observation everywhere on the level land.Be easy to observation, improvements can be rebuild improvement easily if needed.Hanging Basket precompressed process and observation process are all being made the place, and safe, controllability is strong.
Description of drawings
Fig. 1 for the present invention by the chip architecture plane, triangle Hanging Basket purlin and the schematic perspective view of precompressed,
Fig. 2 is the two opposed precompressed duty of Hanging Basket purlin sheet floor map,
Anchor point node A plane drawing behind Fig. 3,
Fig. 4 loading end Node B plane drawing,
Fig. 5 power transmission distribution member 7 schematic perspective views.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is done to describe further through embodiment.
Embodiment:
Referring to Fig. 1; Bridge Hanging Basket cantilever casting construction is with the jack symmetry precompressed job practices of Hanging Basket purlin sheet; Comprised web member 3, cross bar 1, short brace 2,4 four main rod members of long diagonal brace by the triangle Hanging Basket purlin sheet of precompressed, the back anchor point of Hanging Basket purlin sheet is provided with two bolts hole side by side; Loading end is provided with two loading bolt holes side by side, and diameter of bolt hole is 35mm, believes the spacing b=300mm between two bolts hole.
Concrete precompressed operation may further comprise the steps:
(1) select the above precompressed place of area 15m * 15m, smooth compacting precompressed place, subsequent use;
(2) part web member 3, cross bar 1, short brace 2, long diagonal brace 4 are assembled into two identical triangle Hanging Basket purlin sheets;
(3) cross bar 1 with two Hanging Basket purlin sheets is relative, and symmetry is placed on 4 chocks 11, and the cross sectional dimensions of chock 11 is 15cm * 15cm, and length is 180cm.The back anchor point of two Hanging Basket purlin sheets and loading end are placed on respectively wherein on two chocks (11), and the triangle end of the two place Hanging Basket purlin sheet relative with cross bar 1 is placed on respectively in addition on two chocks 11; Through being employed in the height of 4 chocks 11 of method adjustment of squeezing into or extract timber wedge on the chock 11, guarantee that two Hanging Basket purlin sheets all are in level, wherein spacing=the 160mm between the cross bar 1 of two Hanging Basket purlin sheets sees Fig. 2;
(4) the back anchor point pre-fixes
Corresponding two bolts hole of the back anchor point of two Hanging Basket purlin sheets are fixing by bolt 5 respectively, realize the preliminary of anchor point behind two Hanging Basket purlin sheets fixed, and see Fig. 2, Fig. 3;
(5) central bearing point is installed
Steel central bearing point piece 10 is installed between the web member 3 of two Hanging Basket purlin sheets and cross bar 1 node location, is seen Fig. 2;
(6) the Hanging Basket loading system is installed
Two Hanging Basket purlins are provided with two bolts 5 in the corresponding loading bolt of the sheet loading end hole; The lateral surface of two Hanging Basket purlin sheet loading ends is respectively equipped with power transmission distribution member 7; And both sides power transmission distribution member 7 all is set on the bolt 5; Between the power transmission distribution member 7 of one side and the Hanging Basket purlin sheet cross bar 1 jack 8 is installed, jack 8 is the hydraulic jack of 60 tonnages; Tightening nuts 6 is installed in bolt 5 ends, sees Fig. 2, Fig. 4;
Said power transmission distribution member 7 comprises vertical web 13 and the cross web more than two 12 that right-angled intersection distributes that be that has been respectively equipped with booster action between 15, two blocks of frange plates 15 of two blocks of frange plates; On cross web 12 and vertical web 13 junctions, two blocks of frange plates 15, be laid with the bolt hole 14 of two perforations; Spacing between every block of frange plate 15 long and wide 630mm and the 160mm of being respectively, two blocks of frange plates 15 is 180mm.
(7) measure the physical dimension that loads preceding Hanging Basket purlin sheet, the position that reaches loading end, back anchor point concerns size, carries out record;
(8) pass through high-pressure oil pump 9 to jack 8 fuel feeding, hierarchical loading, classification can be by 0t; 10t, 20t, 30t; Five ranks of 40t adopt slide measure accurately to measure each node deformation data of Hanging Basket purlin sheet simultaneously, and each rod member and node place are conscientiously observed; Observe whether tangible loss on transmission is bad, especially the change in displacement situation of loading end, back anchor point;
On the Quan He bridge project construction of Fuyang, need Hanging Basket 4 covers altogether, totally 8; The whole precompressed of designing requirement, every secondary Hanging Basket precompressed weight is designed to 55t, is born by two Hanging Basket purlin sheets; Each Hanging Basket purlin sheet carries 27.5 tons; Consider 1.5 precompressed safety factor, it is 40 tons that each Hanging Basket purlin sheet is got prefabricating load, and field by using jack symmetry of the present invention preloading method carries out precompressed.
The secondary Hanging Basket of Quan He bridge project purlin, Fuyang sheet jack symmetry precompressed hierarchical loading distortion situation
(9) control high-pressure oil pump 9 oil returns, jack 8 load sheddings, 40t is pressed in classification, 30t, 20t, 10t, five ranks of 0t.Measure the change in displacement of load(ing) point, back anchor point simultaneously, observe the stressed situation of change of node, with vernier caliper measurement load(ing) point, back anchor point change in displacement situation.
The secondary Hanging Basket of Quan He bridge project purlin, Fuyang sheet jack symmetry precompressed load shedding distortion situation
(10) according to measuring the gained data; Calculating elastic distortion, nonelastic deformation and calculated value comparative analysis; Draw Hanging Basket purlin sheet precompressed conclusion: can Hanging Basket satisfy the demand, the concrete data of elastic deformation, nonelastic deformation, and whether each main rod member and node satisfy the intensity needs.
On the Quan He bridge project construction of Fuyang, need Hanging Basket 4 pairs, totally 8 Hanging Basket purlin sheets; Require whole precompressed, every secondary cradle construction load calculated value is 55t, is born jointly by two Hanging Basket purlin sheets; Every Hanging Basket purlin sheet is actual to be born construction and carries 27.5 tons; Consider 1.5 precompressed safety factor, it is 40 tons that every group of Hanging Basket purlin sheet got the prefabricating load value, and field by using jack symmetry of the present invention preloading method carries out precompressed.Last table deformation displacement situation for recording in wherein one group of Hanging Basket purlin sheet precompressed loading and the uninstall process.When loading reached 27.5t, the total deformation value that loading end is measured was 160-152.1=7.9mm, and the nonelastic deformation amount is: 152.1-149.1=3mm, and the elastic deformation amount is: 7.9-3=4.9mm; Eliminating the nonelastic deformation amount altogether through precompressed is: 160-154.4=5.6mm.Camber numerical value in the time of Hanging Basket can rationally be set in work progress thus install, thus the absolute altitude and the line style size of bridge accurately controlled.Also proved should the pair Hanging Basket still safe and reliablely under 1.5 safety factor load action simultaneously through the precompressed result, can satisfy the demand of practice of construction load, reached the precompressed purpose fully.
(11) each the node deformation values in Hanging Basket purlin sheet precompressed process surpasses calculated value more than 6%; Or Hanging Basket purlin sheet surface is found significantly to destroy, stop precompressed during excessive deformation; Hanging Basket purlin sheet is judged to be defective; Can adopt local stiffening or re-design two kinds of treatment measures of Hanging Basket, carry out the precompressed checking by said procedure again after disposing.
Claims (4)
1. bridge Hanging Basket cantilever casting construction is with the jack symmetry precompressed job practices of Hanging Basket purlin sheet; Comprised web member (3), cross bar (1), short brace (2), (4) four main rod members of long diagonal brace by the triangle Hanging Basket purlin sheet of precompressed, the back anchor point of Hanging Basket purlin sheet is provided with two bolts hole side by side; Loading end is provided with two loading bolt holes side by side, and diameter of bolt hole is 35mm, and spacing is 300mm, it is characterized in that: concrete precompressed operation may further comprise the steps:
< 1>selects the above precompressed place of area 15m * 15m, smooth compacting precompressed place;
< 2>part web member (3), cross bar (1), short brace (2), long diagonal brace (4) are assembled into two identical triangle Hanging Basket purlin sheets;
< 3>cross bar (1) with two Hanging Basket purlin sheets is relative, and symmetry is placed on 4 chocks (11); The back anchor point of two Hanging Basket purlin sheets and loading end are placed on respectively wherein on two chocks (11), and the triangle end of the two place Hanging Basket purlin sheet relative with cross bar 1 is placed on respectively in addition on two chocks (11); Through being employed in the height of method 4 chocks of adjustment (11) of squeezing into or extract timber wedge on the chock (11), guarantee that two Hanging Basket purlin sheets all are in level, wherein the spacing a=160mm between the cross bar (1) of two Hanging Basket purlin sheets;
< 4>the back anchor point pre-fixes
Corresponding two bolts hole of the back anchor point of two Hanging Basket purlin sheets are realized the preliminary of anchor point behind two Hanging Basket purlin sheets fixed respectively by bolt;
< 5>central bearing point is installed
Steel central bearing point piece (10) is installed between the web member (3) of two Hanging Basket purlin sheets and cross bar (1) node location;
< 6>the Hanging Basket loading system is installed
Be provided with two bolts (5) in the corresponding loading bolt of the loading end hole of two Hanging Basket purlin sheets; The lateral surface of the loading end of two Hanging Basket purlin sheets is respectively equipped with power transmission distribution member (7); And both sides power transmission distribution member (7) all is set on the bolt (5); Be provided with jack (8) between the power transmission distribution member (7) of one side and the cross bar (1) of Hanging Basket purlin sheet, bolt (5) is installed tightening nuts (6) on the end;
< 7>measure the physical dimension that loads preceding Hanging Basket purlin sheet, the position that reaches loading end, back anchor point concerns size, carries out record;
< 8>pass through high-pressure oil pump (9) to jack (8) fuel feeding, hierarchical loading, 0t is pressed in classification; 10t, 20t, 30t; Five ranks of 40t accurately measure Hanging Basket purlin each node deformation data of sheet simultaneously, i.e. distance between the cross bar (1) of the distance between the cross bar (1) of Hanging Basket purlin, load(ing) point place sheet, anchor point place, back Hanging Basket purlin sheet; And each rod member and node place conscientiously observed, observe whether tangible loss on transmission is bad, especially the change in displacement situation of load(ing) point, back anchor point;
< 9>control high-pressure oil pump (9) oil return, jack (8) load shedding, 40t is pressed in classification, 30t, 20t, 10t, five ranks of 0t; Measure the change in displacement of load(ing) point, back anchor point simultaneously, promptly the distance between the cross bar (1) of the distance between the cross bar (1) of Hanging Basket purlin, load(ing) point place sheet, anchor point place, back Hanging Basket purlin sheet is observed the stressed situation of change of node;
< 10>according to measuring the gained data; Calculating elastic distortion, nonelastic deformation and the comparative analysis of design theory value; Draw Hanging Basket purlin sheet precompressed conclusion: can Hanging Basket satisfy the demand, the concrete data of elastic deformation, nonelastic deformation, and whether each main rod member and node satisfy the intensity needs.
2. bridge Hanging Basket cantilever casting construction according to claim 1 is with the jack symmetry precompressed job practices of Hanging Basket purlin sheet; It is characterized in that: said power transmission distribution member (7) comprises two blocks of frange plates (15), has been respectively equipped with the vertical web (13) and the cross web more than two (12) that right-angled intersection distributes that be of booster action between two blocks of frange plates (15); On cross web (12) and vertical web (13) junction, two blocks of frange plates (15), be laid with the bolt hole (14) of two perforations; Long and wide 630mm and the 160mm of being respectively of every block of frange plate (15), the spacing between two blocks of frange plates (15) is 180mm.
3. bridge Hanging Basket cantilever casting construction according to claim 1 is with the jack symmetry precompressed job practices of Hanging Basket purlin sheet, and it is characterized in that: the cross sectional dimensions of said chock (11) is 15cm * 15cm, and length is 180cm.
4. bridge Hanging Basket cantilever casting construction according to claim 1 is with the jack symmetry precompressed job practices of Hanging Basket purlin sheet, and it is characterized in that: said jack (8) is the hydraulic jack of 60 tonnages.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105158653A CN101982611B (en) | 2010-10-21 | 2010-10-21 | Jack symmetric precompaction construction method for hanging basket girders for bridge hanging basket suspension casting construction |
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| CN2010105158653A CN101982611B (en) | 2010-10-21 | 2010-10-21 | Jack symmetric precompaction construction method for hanging basket girders for bridge hanging basket suspension casting construction |
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| CN101982611B true CN101982611B (en) | 2012-08-08 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494907A (en) * | 2011-11-16 | 2012-06-13 | 中铁三局集团有限公司 | Static load test method for in-situ hanging basket |
| CN103048198A (en) * | 2012-12-27 | 2013-04-17 | 中铁港航局集团有限公司 | Load test method for rhombus hanging basket |
| CN103758040B (en) * | 2013-12-31 | 2016-03-23 | 中铁二十一局集团路桥工程有限公司 | Frange plate construction special hoisting bar and using method is watered after sound barrier T beam |
| CN105568870B (en) * | 2015-12-25 | 2017-04-05 | 广东冠粤路桥有限公司 | For the triangle hanging basket method cantilever device and its construction method of cross-line bridge construction |
| CN113073567B (en) * | 2021-04-12 | 2023-01-31 | 中国建筑第四工程局有限公司 | Triangular hanging basket counter-force prepressing construction method |
| CN113417210A (en) * | 2021-07-19 | 2021-09-21 | 中铁大桥局第七工程有限公司 | Ground pre-pressing device and method for tower column cross beam support |
| CN114232497A (en) * | 2021-12-31 | 2022-03-25 | 中建桥梁有限公司 | Large-scale cable carries quick-witted counter-force pre-compaction device of crane |
| CN117368094A (en) * | 2023-12-07 | 2024-01-09 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Device and method for detecting anti-slip performance of cross cable buckle with space reticular structure |
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| JP2009114853A (en) * | 2009-01-23 | 2009-05-28 | Okkusu Jack Kk | Weight transporter with built-in propulsive mechanism |
| CN201250385Y (en) * | 2008-09-10 | 2009-06-03 | 中铁八局集团第一工程有限公司 | Rear support long cantilevered traveling carriage system for cable-stayed bridge cantilever casting |
| CN201574359U (en) * | 2009-10-16 | 2010-09-08 | 中铁十七局集团第二工程有限公司 | Hanging basket equivalent preloading device used in high-pier large-span bridge construction |
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| US6169954B1 (en) * | 1999-04-09 | 2001-01-02 | Mccrary Homer T. | Intelligent public transit system using dual-mode vehicles |
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| CN201250385Y (en) * | 2008-09-10 | 2009-06-03 | 中铁八局集团第一工程有限公司 | Rear support long cantilevered traveling carriage system for cable-stayed bridge cantilever casting |
| JP2009114853A (en) * | 2009-01-23 | 2009-05-28 | Okkusu Jack Kk | Weight transporter with built-in propulsive mechanism |
| CN201574359U (en) * | 2009-10-16 | 2010-09-08 | 中铁十七局集团第二工程有限公司 | Hanging basket equivalent preloading device used in high-pier large-span bridge construction |
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