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Hollister Frauen Kurzen Tees Grouting Pile Foundation Construction of bridge wat

Grouting Pile Foundation Construction of bridge water
  
  
  paper Keywords: the bridge foundation Geological covering steel pipe pile platform grouting reinforcement process  
   
Abstract  :  during bridge water pile foundation construction process of the Central Standing Committee suffered too complex geological covering thorny issue is difficult to guarantee a solid build water construction platform, this paper Heng Yan highway cupola Chong Mi water bridge in build water construction platform, through the use of grouting technology to reinforce the geological covering, in order to effectively solve such problems and make a brief description of Grouting Pile Foundation Construction of bridge water .
  I. Introduction  
The  cupola Chong Mi water Bridge across the Mi River bridge length of 867.08m, bridge type arrangement of 15 × 25 +43 +4 × 50 +43 +8 × 25, right angle between 90 ° Prestressed T beam substructure column pier with pile foundation, a total of 30 rows of Pier 150 Pile Foundation; According to the geological department of geological drilling data show the bridge site area is karst height development zone, the geological situation is quite complex. The bridge started on October 26, 2006, because this bridge is the value for the Yan high speed across the board control projects, the requirements of owners demi opened to traffic by the end of November 2007, our department has faced heavy construction tasks, tight situation, for how to determine reasonable Pile Foundation Construction of this bridge is critical to the overall construction schedule.
Cupola rushed Mi water Bridge into the destruction of Hengyang shore approach spans, the main bridge, and Yanling shore approach spans, this article on the main bridge section that water pile foundation construction process to build a steel pipe pile platform to solve the overburden is difficult to guarantee firmly established, through the use of grouting reinforcement in order to effectively solve this problem, make a brief analysis of Grouting Pile Foundation Construction of bridge water, in order to provide a reference for bridge construction has similar geological conditions.
  Second, the determination of the water pile construction platform program  
Mi water  cupola red main bridge at 16 Pier and ending at 21 Pier, Pier 6 row 30 of pile foundation, pile diameter φ2.5m, are embedded in rock piles, mainly of its geological covering layer as pebbles, sand layer and clay, the thickness is generally 6 to 32m;
Since 16 # 17 # pier near the shore, the water level shallow,Hollister Frauen Kurzen Tees, built island platform; 18 # to 21 # pier deep water (4 to 9 meters), and often dredge, Yun Shachuan by steel pipe piles water platform construction,isabel marant, The platform bearing structure 12 φ60cm steel pipe piles.
  Water pile construction platform construction:  
I first conducted by the Ministry of Pier 18 # water platform construction, construction found: gravel layer structure of high density, but also boulders, while in the construction process using the human dig sand of the riverbed destruction; 60T The vibratory hammer tapping of the steel pipe piles only vibration under 2.2 ~ 2.8m. 18 # -5 the pile φ3.0m of, outside Steel Casings 90T vibratory hammer can only vibration under 2.0m; 12m3 air compressor blowing sand with a vibratory hammer vibration, the effect is also poor, and the gravel layer containing boulder, only sinking 3m. Larger vessels and lifting equipment could not enter the river on the bridge site, has a downstream power plant construction; the Steel Casings embedded gravel layer 3m too little, instability, the rig red diamond easily cause the Steel Casings partial bit and slump hole, the platform and the safety of construction workers can not be guaranteed, 18 Pier water platform Although structures, have not been able to drilling rigs. To this end, the pile foundation construction of the water once lag, seriously affect the overall construction schedule of the bridge, has aroused great concern of the owners.
To this end, we invited experts to convene a meeting of experts, through analysis, research ultimately determined by using the method of grouting water platform reinforced construction technology program.
,MBT Danmark, Grouting program implementation:  
1, grouting before, the scope of the work platform spilled bag of muddy or clay range: around the working platform to about 2m,billig nike free, thickness of 0.5m; purpose: the effective control of slurry grouting the bottom level of the riverbed diffusion avoid to the river Similar to the method of
2, grouting drilling layout: see Figure 1 illustrates.



35m


; second sequence of a first sequence of holes hole third order of holes the SHAPE  * MERGEFORMAT
First order around the working platform layout grouting drilling spacing of about 6m, the second order of about 0.5m Pile Steel Casings around layout encryption the grouting hole (inspection hole), spacing about 3m ( The second sequence of holes played to securely the Steel Casings the role). The third sequence Hole the cave hole center grouting. Construction, according to the geological conditions and grouting do dynamic adjustment.
3, drilling and grouting run: XY-100 or HT-150 drilling rig the order sequence drilling., The first construction the first sequence drilling - grouting; sorting drilling Descending The grouting, order:
  

          
  
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