The construction method of the simply and multy span preflex composits bridge by girder's up-down(down-up) method.

  Manufacture of preflex beam.

  Manufacturing mothod
(A patent number 282773)

 The typical way of producing preflex composite beam is to make two preflex beams simultaneously by putting one beam on the top of the loading table and the other beam under the loading table espectively. This time occurs across buckling prevent ross-beam that respectively steel shape was connected. This method is manufacture that simultaneously more than four beams per a time by putting load operations of preflexion. Moreover it can reduce not only the unit cost of manufacture but also a term of works.

 

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Manufacture processing of preflex beam.

 1) foundation of a loading stand and steel shape

 2) foundation of binding-bolt

 3) foundation of oil pressure jack

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

 

 4) establishment of cross beam

 5) preflexion putting load

 6) establishment of a reinforcing rod and a mold

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  

 7) setting casing concrete and curing

 8) piling-up later beam completion

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Operate of multi-span continuous preflex composits bridge(The Ministry of Construction and Transportation reserved new method, number 270) (A patent of America number 5644890, A patent of Europe( Germany, france and so on ten nations) number 94910059.8, A patent of Canada number 2134644, A patent of Australia number 679502, A patent of Japan number 2948909, A patent of china number 64465, A patent of the interior number 105754, 0260675 and 10-2000-054500)

  An outline

1) Operate method of inner supports by up-down.
 Operate of continuous preflex composits bridge division-manufactured preflex beams simplicity deferment each spans at a field, and after each beams connecting  use of connection plate, import compress stress confrontation negative moment after composition at inner support of slab concrete as pier section support of up and down, Method effectively confrontation deflection and crack as the lower part of connection-shape import appendix compress stress.

2) Operate method of both end supports by up-down
 In order to danger of safety accident cause of enforce up and down as inner support of use expatiation inner support up and down method, Method of gain efficient operate up and down at both end supports nearly to foundation a direction.

   Construction method of 2 spans continuous preflex composit beam

1. Method of after lifting up sub-support at mid, setting floor-plate, web and hunch concrete at negative moment area
2. Method of Lifting up sub-support at mid span, setting floor-plate, web and hunch concrete at entire a section
3. Method of Lifting down both of end supports at a span, setting floor-plate, web and hunch concrete  at entire a section

  Construction method of 3 spans continuous preflex composit beam
    
1. Method of after lifting up sub-support at mid, setting floor-plate, web and hunch concrete at negative moment area
2. Method of Lifting down both of end supports at a span, setting floor-plate, web and hunch concrete at entire a section
3. Method of again lifting up sub-support at mid

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Each spans division manufacture of preflex beam

  An outline

Division manufacture preflex beam of each spans as B.M.D shape of continuous bridge. Circumstance of preflex beam for outer side span is that maintain from one side end to about locate 1/8 and then import compress stress lower concrete of rest  section, Circumstance of preflex beam for inner side span is that maintain from both ends to about locate 1/8 and then import compress stress lower concrete of rest  section.

<Method of manufacturing>
    

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Construction method of 2 spans continuous preflex composits beam(method 1)

 

Division-manufactured deferment and connection of preflex beam(continuously)

 

Lifting up sub-support at mid span

 

Setting floor-plate, web and hunch concrete at negative moment area

 

After stiffen of setting concrete and lifting down a inner support

 

Setting floor-plate, web and hunch concrete at positive moment area

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

   Construction method of 2 spans continuous preflex composits beam(method 2)

 

Division-manufactured deferment and connection of preflex beam(continuously)                                                        

 

Lifting up sub-support at mid span

 

Setting floor-plate, web and hunch concrete at entire a section

 

Lifting down a inner support after stiffen of setting concrete

 

Conclusion after deferment of support

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Construction method of 2 spans continuous preflex composits beam(method 3)

 

Division-manufactured deferment and connection of preflex beam (continuously)

 

Lifting down both of end supports at a span

 

Setting floor-plate, web and hunch concrete at entire a section

 

Lifting up both of end supports after stiffen of setting concrete

 

Conclusion after deferment of support

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

   Construction method of 3 spans continuous preflex composits beam(method 1)

 

Division-manufactured deferment and connection of beam at number 1, 2 span

 

The lifting up a connected number 1 inner support

 

Setting and curing is floor-plate, web and hunch concrete at number 1 negative moment area

 

Lifting down inner support of number 1 span

 

After connecting of number 3 span beam, the lifting up a connected inner support of number 2 span

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

 

Setting and curing is floor-plate, web and hunch concrete at number 2 negative moment area

  

Lifting down inner support of number 2 span

  

Setting and curing is floor-plate, web and hunch concrete at positive moment area

  

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Construction method of 3 spans continuous preflex composits beam(method 2)

 

Division-manufactured deferment and connection of beam at number 1, 2, 3 span

  

Lifting down both of end supports at span

  

Setting and curing is floor-plate, web and hunch concrete at entire a section

  

Lifting up both of end supports at span

  

Conclusion after deferment of support

  

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

   Construction method of 3 spans continuous preflex composits beam(method 3)

 

Division-manufactured deferment and connection of beam at number 1, 2 span

  

The lifting up a connected number 1 inner support

  

Setting and curing is floor-plate, web and hunch concrete at number 1 negative moment area

  

Lifting down inner support of number 1

  

Setting floor-plate, web and hunch concrete at number 2, 3 span, and lifting up a connected number 1 inner support again.

  

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  

Setting floor-plate, web and hunch concrete at number 2, 3 span, and lifting up a connected number 2 inner support

  

Curing floor-plate, web and hunch concrete at number 2, 3 span, Lifting down inner support of number 2

  

Lifting down a connected number 1 inner support again.

  

Lifting down a connected number 1 inner support again.

  

Setting and curing is floor-plate, web and hunch concrete at number 1 positive moment area

  

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Practice operate processing of continuous preflex bridge(3spans continuous) (Method of lifting up and down a connected inner support)
 Kumjung Bridge(Pusan metropolitan kumjung-gu dugu-dong location)
 First of the world operating method of 3 spans continuous preflex composit beam is used lifting up and down a connected inner support
 2002 Asian Game Kumjung stadium entry bridge.
 whole extension length : 90m(30m*30m*30m)
 the specifications

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Practice operate processing of continuous preflex bridge
   (Kumjung Bridge )
   (Method of lifting up and down a connected inner support)

1. Manufacturing Preflex Beams and Setting the preflex beam


2. Connecting the preflex beam number of 1, 2 span

3. The lifting up of the 1st inner supports

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Practice operate processing of continuous preflex bridge
   ( Kumjung Bridge )
   (Method of lifting up and down a connected inner support)

4. Arrangement of Steel bar in the 1st negative moment section

  5. Casting slab concrete in the 1st negative moment section

 

   6. Down of the 1st inner supports

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Practice operate processing of continuous preflex bridge
   ( Kumjung Bridge )
   (Method of lifting up and down a connected inner support)

 7. After connecting the preflex beam number of 2, 3 span, lifting up number of 2 inner supports

 

8. Casting slab concrete in the 2nd negative moment section

 9. Down of the 2nd inner supports

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Practice operate processing of continuous preflex bridge
   ( Kumjung Bridge )
   (Method of lifting up and down a connected inner support)

 10. Arrangement of Steel bar in the positive moment section

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Practice operate processing of continuous preflex bridge
   (2 spans continuous)
   (Method of lifting up and down both of end supports)

  Songchu Bridge(Kyunggi province Euijungbu city Songchu loation)

   · First of the world operated use H-shape method of 2 spans continuous preflex composit beam is used lifting up and down both of end supports
   
   · Import practice camber produce plastic transformation at H-shape      Rolled Profile

   · whole extension length : 40m(20m*20m)

   · width of bridge : 6m

   · the specifications

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Practice operate processing of continuous preflex bridge
   (Songchu Bridge)
   (Method of lifting up and down both of end supports)
   

  1. The field setting manufactured preflex beam

  2. The complete view of installing supporter for setting end part

  3. Connecting the preflex beam number of 1, 2 span

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Practice operate processing of continuous preflex bridge(Songchu Bridge)
   (Method of lifting up and down both of end supports)

  4. Casting  casing concrete in the connecting section

  5. The 1st shift down of the abut

  6. Setting of Slab concrete form and arrangement of Steel bar

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Practice operate processing of continuous preflex  bridge(Songchu Bridge)
   (Method of lifting up and down both of end supports)

  7. The 2st shift down of the abut

   8. Casting slab concrete

   9. Lifting up the abut

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method. 

  Practice operate processing of continuous preflex bridge
    (Songchu Bridge)
   (Method of lifting up and down both of end supports)

  10. Setting shoe after lifting up

 

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

 Operating preflex composits bridge of the simply span.

   At outline

 Preflex-beam originate loss of about 3040% that compress stress of lower  concrete is imported together with the time elapsed from manufacture to set.  Like  this loss of compress stress operate on a section increase primary factor of whole preflex composit shape. Consequently, In manufacture scene of near field for restore like this loss of compress stress and raise economical efficiency of whole composit shape, raising so compress stress of appendix import volume that defer preflex-beam to upward gabent of the central span then after setting and curing part width of hunch, web concrete and slab concrete, with removal the gabent import additional compress stress at the lower concrete by be increase section value and it deferment at a addition compress stress of practice a field and a bridge staff, setting at the rest slab concrete. this method is expect fast operation and exactness of operate.
Simply preflex composit bridge because of this method is gained shape-height than simply preflex composit bridge of previous decline and steel-volume effect of each about 10%, 2030% at shape-height and steel-value.

The construction method of the simple and continuous preflex composits bridge by girder's up-down(down-up) method.

  Operate order

 1) Deferment preflex-beam to upward gabent

 2) Operating web, hunch concrete and slab concrete of part

 3) Remove gabent after cure the concrete surface.

 4) Operating the rest slab concrete after bridge staff deferment.

Section details of A-A