METHOD STATEMENT
BORED PILING 1. GENERAL a. The method method statemen statementt for bored bored piling piling below descri describes bes the whole constru constructi ction on procedures including material and equipment required for the construction of bored cast-in-situ piles b. Detail of the procedures contained herein may be reviewed periodically and modified based on actual requirement c. The piles piles to be constr constructed ucted will will be of a nominal nominal specified specified diamete diameter, r, bored bored through through overlying soils to found in the bedrock strata or remain in the soil to act as shaft friction and end bearing piles. d. The piles piles are designe designed d by the Enginee Engineerr to resist resist axial axial compress compressive ive loads. loads.
2. BO BORE RED D PILES PILES CONST CONSTRU RUCT CTIO ION N a. The pile pile boring boring operati operations ons shall shall be perfor performed med using using the suitable suitable rotary rotary drill drill rigs depends on the diameter, depth, and soil condition an d construction method. b. f necessary, necessary, the bore-holes shall be stabili!ed with a temporary casing in the upper layer "depends on soil and site condition#. c. The The leng length th of the the casi casing ng will will be dete determ rmin ined ed from from the the actu actual al soil soil cond condit itio ion n encountered on site. d. $enton $entonit itee shall shall be used for unstabl unstablee subsoil subsoil conditi condition on and for piles equal equal and more than %&'cm diameter. diameter.
3. SET SETTI TING NG OUT OUT a. The The loca locati tion on of perm perman anen entt bore bored d pile piless shal shalll be set set out out and and pegg pegged ed by the the subcontractor(s surveyor based on approved setting out drawings from consultant and control points at site. b.
The surveying details of each location to be recorded incorporating reduced level and coordinates.
TAHER AMMAR
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METHOD STATEMENT c. Each individua individually lly surveyed surveyed pile pile position position shall shall be protecte protected d from distur disturbance bance prior prior to commencement of boring works. d. Two reference reference points points to be installed installed equidist equidistant ant at not less less than ).'m from from the pile pile centre location. e.
* pilot pilot hole hole of about +- +- meter deep deep shall shall be drilled drilled at the pile pile location. location.
f. The eccentr eccentricity icity and alignmen alignmentt of the pilot pilot hole is is then then checked. checked.
4. DRI DRILLING a. rior to to commencing commencing any operation operations, s, the client client representa representative tive will will be required required to verif verify y all assoc associat iated ed techni technical cal inform informati ation on such such as presen presence ce of servic services, es, pile pile coordinates, platform and cut-off levels, validity of drawings etc. b. Then, if necessary, necessary, after accurately setting out of the pile location by a land surveyor, a temporary casing will be set in position with length of casing to be determined from ground condition. c. The vertical vertical accuracy accuracy of the casing casing will will be checked checked during during the install installation ation process process using ) numbers of plumb bob. d. Excava Excavatio tion n of the soil soil inside inside the casingbo casingbored red holes holes will be carried carried out using the rotary /elly bar and the auger or bucket method. e. The drill drilling ing process process will will be continu continued ed to the designed designed foundi founding ng depth depth or to the commencement of rock head level by using augers and drilling buckets. f. ile ile length lengthss shal shalll be as per per the the curre current nt constr construct uctio ion n draw drawin ings gs or as otherw otherwis isee instructed by the clientEngineer. clientEngineer. g. *t the point point of encounte encounteri ring ng the rock head level level,, for examples examples,, where the soil soil drilling tools are unable to penetrate the strata any further, boring shall cease in order that the client(s representative may verify the occurrence and confirm the rock socketing criteria. h. 0or drilli drilling ng through through rock, rock drilli drilling ng tools shall shall be applied applied.. This shall shall includ includee ck
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METHOD STATEMENT i.
The final final toe level level of the pile shall shall be verifie verified d by the client client((s represen representat tative ive.. * detailed record of all encountered ground conditions together with the associated times and type of equipment and materials used will be recorded in the 1ile $ore 2og(.
3.
4pon reaching the final depth, loose and remolded material and debris will be removed using 1cleaning bucket(. The cleaning bucket is a specially design flat bottom bucket which will pick up all the loose material at the bottom of the hole. The base of the hole shall be checked by the measuring the depth of the base.
5. BENTO NTONITE a. The benton bentonite ite is delive delivered red to site site in 5'kg per bags, bags, which which are stored stored under under cover. b.
The bentonite is mixed by high turbulence mixers and the slurry is stored in a pool. The si!e of the pool shall have a storage capacity of about 6'' cu. m.
c. * laborat laboratory ory is provided provided on site site for regular regular testin testing g of the slurry slurry.. d. The The mini minimu mum m frequ frequen ency cy of testin testing g and the accep accepta tabl blee range range of phys physic ical al characteristics of the bentonite slurry must be conforming to specification. e. 2aboratory 2aboratory reports reports are kept during during the constru construction ction period. period. f. *pparatus *pparatus availa available ble in in the site laboratory laboratory includes includes the the followin following7 g7 % mud balance "density test# % marsh cone "viscosity test# % sand screen set "sand content test# aper for measuring h g. 8ontaminate 8ontaminated d bentonite bentonite slurry slurry will be be discarded discarded by mixing mixing with with the earth earth and transport to dumping area. h. $entonite $entonite will will be used used as a drilli drilling ng fluid fluid to stabili stabili!e !e the bored bored hole. i.
Durin During g the the bori boring ng proces process, s, the bentoni bentonite te slurr slurry y is kept kept as high high as possi possibl blee within the casing and well above the existing ground water
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METHOD STATEMENT k.
* subme submersi rsible ble turbin turbinee pump attached attached to the tremie tremie pipe pipe is lowered lowered to the bottom of the bored hole.
l.
The benton bentonite ite,, loaded loaded with soil soil particl particles es in suspens suspension ion,, is drawn drawn off from from the bottom of the bored hole and recycled through a 8aviem or equivalent recycling unit.
m. The process process is continued continued until the bentonit bentonitee arriving arriving from the base base of bored hole had been flush out.
6. INSTALLA INSTALLATIO TION N OF STEEL STEEL CAGE CAGE a. The reinfor reinforcement cement cage will will be fabricated fabricated in in lay-down lay-down section sections. s. b. The length, type and si!e of the steel cage will be according to contract drawings and specifications. c. The cages will be provid provided ed with stif stiffening fening rings rings and others others accessor accessories ies to enable enable handling, lifting and installation without permanent deformations. d. 8ages 8ages will will be instal installed led into into the bored hole hole using a service service crane crane of the requir required ed lifting capacity e. 8onc 8oncre rete te spac spacer erss wire wired d to the the cage cage shal shalll provi provide de late latera rall supp suppor ortt and and ensu ensure re adequate concrete cover. f. 9pac 9pacer erss shall shall be plac placed ed at + equa equall levels levels of each each %)m cage cage with + nos at each each level. g.
f the diamet diameter er of bored pile pile more more than )''cm )''cm the spacers spacers shall shall be placed placed more than + nos to be advised by consultant representative.
7. CONC CONCRE RETI TING NG a. *ll pile pile shall shall then be concreted concreted by using the "tremie "tremie## method. method. b. 8oncrete of higher slump ":%;5mm<)5mm# otherwise specified, shall be used for 1tremie( method.
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METHOD STATEMENT d.
8oncrete 8oncrete level level of the borehole borehole was recorded recorded after after each concrete concrete truck truck discharge discharged d and graph will be plotting against theoretical.
e. =ne length length shall shall be continuous continuously ly embedded embedded in the the concrete concrete during this this process process to to ensure that the discharge of concrete is below the level of the impurities, which might be present in the top part of the rising head of concrete. f. *ll testi testing ng and samplin sampling g of the concrete concrete shall shall be carried carried out as instr instruct ucted ed by the Engineer or Engineer (s representative. g. * comple complete te record record of all cubes cubes taken shall shall be mainta maintaine ined d in a proper proper form and slump test results shall be recorded on the 1Delivery =rder( and the 1ile $ore 2og(. h. *ll compressi compressive ve concrete concrete tests will will be carried carried out at the supplier( supplier(ss laboratory laboratory and independent lab. i.
The client client will will be notifie notified d of the dates dates of the test test by regular regular issuance issuance in order order the tests maybe witnessed.
3.
0or a continuous assurance of concrete quality and integrity, integrity, concrete will be poured to minimum '.m above the theoretical cut-off level "=therwise 9pecified#.
k. *ll complete completed d piles shall shall be temporar temporarily ily barricaded barricaded and and to be backfille backfilled d to ground level with a suitable material the next day.
8. SPOIL SPOIL REMO REMOV VAL a. 9poil 9poil from piles piles will be cleare cleared d from the boring boring locati locations ons by means of an excavat excavator or as boring proceeds. b. Depending on the volume of spoil excavated, it will be removed to stockpile area or spoil pit, for drying before loading and removed off-site.
