A kind of method of removing the bored pile construction obstacle
The present invention relates to a kind ofly in the transformation process of harbour, remove the method for bored pile construction obstacle.
Along with the high speed development of national economic development, the problem of whole nation industry, shipping business infrastructure scarce capacity exposes to such an extent that become increasingly conspicuous, and has seriously hindered the paces of economic high speed and sustainable development.In the infrastructure in China coastal port area, it is aging that ubiquity facility, and harbour face bearing capacity is not enough, can not satisfy the growing needs of cargo handling capacity, and these problems bring great resistance for the development of China's shipping interest.Though can invest to build the contradiction that new harbour relaxes this demand, have a lot of adverse factors: bankroll problem (investing huge); Construction period problem (from project verification, demonstration, to design, construction period is very long); Environmental factor (construction project is to the influence of surrounding environment) or the like.
Therefore, for addressing the above problem, in port infrastructure is in recent years built, often take terminal facilities is carried out the method that segmentation is transformed.Its advantage is: small investment instant effect (transform on the basis of existing facility, can make full use of the useful structure of old building, thereby cost is low, the duration lacks) can guarantee investor's interests.Therefore, in this class engineering, some new technologies, new technology continue to bring out.Some workmanshiies are guaranteed, construction safety, reliable, and construction costs is reasonable, the construction technology and the measure of saving, more and more is subjected to the attention of the parties concerned.
At present, in China's long piled wharf improvement project, because the structure of harbour causes inevitably running into huge thick rock mound, for bored pile construction, must find simple, fast processing method to remove these obstacles on the stake position, guarantee construction safety, efficiently carry out.Traditional handicraft often adopts the construction processing scheme of heavy excavation, because excavation inevitably causes the surrounding soil passive resistance to reduce, soil body unstability produces the landslide and make all round, the lighter causes surrounding piles plinth inclination and distortion, produces potential safety hazard, weight person's pile foundation is sheared destruction, harbour (or surrounding buildings thing) collapses, and causes great security incident.Therefore before scheme implementation, not only need to carry out the necessary security demonstration, and must reinforce the soil body around the excavation area, the variation of necessary precision monitor surrounding soil situation in construction simultaneously, in case note abnormalities, must stop excavation, and take the measure of setting each other off further the soil body on every side to be carried out consolidation process.And to remove the harbour cover plate earlier before the construction, after excavation is finished, the erection construction platform.Therefore, exist huge construction safety risk; Operation increases, and efficient reduces greatly; The input of upkeep operation safety is very big.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that periphery is influenced little and the removing bored pile construction obstacle that efficient is very high.
A kind of method of removing the bored pile construction obstacle of the present invention comprises the steps:
A) on wharf slab, offer than the hole of designing the stake slightly larger in diameter, as the heavy vertically-guided of establishing of control steel casing;
B) put into the steel casing in the above-mentioned stake hole of offering, steel casing internal diameter is than designing about the big 5～15cm in stake footpath;
C) fixing replacing of a connection steel casing and vibrating hammer in the vibrating hammer bottom beats;
D) the steel casing is sunk establish, when the top of steel casing exceeds the scope of operation 50～60cm, stop hammering, will separate for beating by vibrating hammer vibration hammering for beating with the steel casing;
E) carry out the butt joint of partial node steel casing as required, repeat above-mentioned connection and heavy step of establishing after butt joint is finished again, sink to preposition until the steel casing;
F) will separate for beating, remove the obstruction in the steel casing, carry out bored pile then with the steel casing.
Preferably, described for the packing draw together upper end and bottom, the bottom can be inserted in the described steel casing, the upper end is used for fixing described vibrating hammer.
Preferably, described is about 60cm for the height of beating, and described height for the bottom of beating is about 30cm.
The present invention has following advantage:
1) to the minimum that influences of original old structure.Because this technology is just handled at point (stake position) one by one, and is therefore little to the influence of peripheral structure thing;
2) expense is low.Because this technology does not damage original rock mound and original old structure, therefore just do not recover the expense of these structures;
3) penetration power is strong.Can penetrate 12 meters thick riprap layers;
4) efficiency of construction height.A plurality of points can carry out simultaneously, thereby have improved processing speed greatly.
Description of drawings
Fig. 1 is the invention process schematic diagram.
The specific embodiment
As shown in Figure 1, specific implementation method of the present invention comprises the steps:
A) at first use the pneumatic pick perforate according to the stake position of putting well on wharf slab 6, opening diameter as steel casing 4 heavy guiding of establishing, is controlled its verticality than designing about the big 15cm in stake footpath;
B) in the above-mentioned stake hole of offering, put into steel casing 4, steel casing 4 generally adopts to connect more than or equal to the thick roll of steel plate pressure welding of 8mm and forms, the casing internal diameter is than the design stake big 5～15cm in footpath, can make by merogenesis, first joint length generally than the scope of operation to the height of mud face have more 2～3 meters (if oversize, wayward verticality during hammering.For example: the scope of operation is 5 meters to the height of mud face, then first joint length is controlled at 7～8 meters and is advisable), steel casing 4 bases add the reinforcement steel plate guard ring of the thick 8mm of the wide 200mm of weldering, and do tough angle in the bottom side and (guarantee that steel casing 4 is at the heavy not crimping of establishing in the process of vibration, strengthen its penetration power simultaneously), all the other respectively save length should not be greater than 4 meters, and the total length fibrous root determines according to the geological condition of job location, and the bottom of general steel casing 4 should enter clay or silty clay more than 1 meter.(length overall is 19 meters in the present embodiment).
C) after steel casing 4 inserts the stake hole, subsequently steel casing 4 is adjusted, to guarantee that it is within deviation (comprising pile position deviation and the perpendicularity deviation) scope that allows, 20 * 30cm timber wedge 3 filled in the slit between the hole of being opened on steel casing 4 and the wharf slab 6, and jam-packed, do not change to guarantee steel casing 4 heavy position and verticality of establishing in the process.
D) will be fixed with for making a call to 2 vibrating hammer 1 with crane and sling, and will be inserted in the steel casing 4 for making a call to 2.Be mainly used in connection vibrating hammer 1 and steel casing 4 for making a call to 2, be made of upper end 21 and bottom 22 for making a call to 2, for making a call to about 2 high 60cm, its bottom 22 is the steel cylinder (external diameter is slightly less than the internal diameter of steel casing 4) about high 30cm, can insert in the steel casing 4, play the guide-localization effect; Its upper end 21 is thick than the bottom, can adopt bolt to be connected and fixed between itself and the vibrating hammer 1.Replace and make a call in the 22 insertion steel casings 4 of 2 bottoms, fix with the top of steel casing 4 and for bottom 22 welding of making a call to 2.
E) open vibrating hammer 1, first joint steel casing 4 is sunk in vibrating hammer 1 hammering, heavy establishing in the process, the sling hook 5 of vibrating hammer 1 of crane should keep slightly lax and state that do not break off relations, to monitor the position and the verticality of steel casing 4 simultaneously, as not satisfying the deviation requirement, stop proceeding after hammer is adjusted, when the top that head saves steel casing 4 exceeds the scope of operation 50～60cm (be convenient to next step sever between casing and casing dock weld job), stop hammering, sever for making a call to 2 and the welding position of steel casing 4 with gas welding;
F) hang out for making a call to 2 and vibrating hammer 1, carry out the butt joint of partial node steel casing 4 then as required, repeat the above-mentioned connection and the step of establishing of sinking after butt joint is finished again, till head saves steel casing 4 and sinks to preposition.
G) sever for making a call to 2 and the attachment weld of 4 of casings, will for make a call to 2 and vibrating hammer 1 hang, with dashing obstruction such as the removing steel casing 4 interior rubbles of grabbing bucket, just can carry out Bored Pile Construction then.
Above-mentioned power-equipment is generally selected more powerful vibrating hammer 1 for use, as 90 hammers or 80 hammers.
This technology can be widely used in the pile foundation engineering (bored pile of improvement project of the long piled wharf of coastal subgrade, steel pipe pile, steel sheet pile), also can be applicable among the new harbour pile foundation engineering construction, the pile extension that also can be applicable to the underground broken pile of shallow-layer is handled, and has positive dissemination.