1 scope
This technology is applicable to general
industry and civil architecture Foundation, base Groove to assessment, sewer,
an outdoor stage, indoor and apron and lime soil Foundation (cushion).
2 construction preparation
2.1 materials and equipment:
2.1.1: advised to give priority to the use
of trench dug in the dirt, but must not contain organic impurities, prior to screening,
its diameter is not more than 15mm. Water content should meet the requirements.
2.1.2 lime: the ash or lime; should be
fully cured before using sift shall not contain size block of quicklime is
greater than 5mm, or contains too much water.
2.1.3 equipment: General should have wooden
Rammer, frog or diesel ramming machines, trolleys, sieve (diameter 6~10MM and
16~20mm two), standard bucket, on foot, rake, a flat shovel, hose, small lines
and Pocket rule.
2.2 operating conditions:
2.2.1 pit (Groove) in front of the shop
dust study inspection must be brazed, and according to the design and
exploration Department Foundation has been processed, through hidden
procedures.
2.2.2 base side dust must be based, check
basement walls and underground water-proof layer, protective layer, damage
should be repaired, when hidden procedures. Poured concrete foundation walls
and beams shall meet the requirements of strength, not hit damage concrete.
2.2.3 the local water level higher than the
pit (notch) at the end of construction should take measures to reduce
groundwater drainage or, enable the groundwater level was maintained at below
the 0.5M, shall not be affected by water immersion in a 3D.
2.2.4 engineering should be based on
compaction factor characteristics, design, and construction types, soil
conditions, rational determination of soil water content control. Thickness of
the spreading of lime-soil compaction and consolidation parameters such as
playing a few times. Key lime filling its parameters should be determined by
compaction tests.
2.2.5 house dust and tunnel dust, should be
completed on water pipe installation or after the trench wall reinforcement
measures such as, and. On the sewer, tank, flooring and water clean or debris,
waste and other organic matter.
2.2.6 construction, as a sign of good
levels of elevation. As in the pit (Groove) or trench on every 3M on the slopes
of nail dust on flat wood stick, indoors and on playing on the Wall beside the
apron level or nail on the floor good elevation control stakes.
3 operational processes
3.1 process:
Testing soil and lime powder and sift the
quality of lime-flyash soil mixing → → bottom clearing → layered
spread dust →
Dynamic compaction-compacting → leveling
acceptance
3.2 first check type and soil quality and
lime quality meets the standard requirements and then sift. If it is made of
gray boring Hydrated lime, 6~10MM sieve, sieve, is lime can be used; using
16~20mm soil sieve, sift, shall ensure that the size requirements.
3.3 dust mix: volume ratio of mixture ratio
of lime application, apart from special design requirements, typically 2:8 or
3:7. Bedding dust must be standard, strictly control the mixing ratio. Uniform
mix must be timely, with at least twice, mix good lime color should be
consistent.
3.4 lime soil construction, should be
appropriately controlled moisture content. Site inspection methods are: dust
with her hands clenched, two-finger pinch light is broken. Too much water or
soil is low, should be allowed to dry soaking wet.
3.5 pit (Groove) or base by the end of the
surface should be cleaned. Especially trough falls of tilled soil, wind-blown
leaves, Wood scraps of paper, plastic bags and other refuse clutter.
3.6 tiered Pu lime: lime casting thickness
of each, according to the different construction methods and selection
according to table 2-l.
Lime's largest virtual shop thickness table
2-1
Types of compactor weight (kg) empty paving
thickness (mm) remarks
1 wooden Rammer 40~80 200~250 human ramming
and landed high 400~500mm, a RAM and a half RAM
2 light tamping Rammer, diesel -200~250
frog ramming machine
3 roller 6~10T 200~300 double
Wooden rake after every casting leveling,
and pit (Groove) on the side wall of wood bent or correspond to the standard log
check on the floor.
3.7 dynamic compaction-compacting: RAM
(pressure) times should be designed according to the needs of dry soil density
or field test determined that normally no less than three times. Artificial
ramming a RAM and a half RAM, RAM RAM, connected to the line, vertical and
horizontal cross.
3.8 when the lime soil construction, not in
the corner, under the Foundation and load-bearing wall between Windows by Cha,
Cha of the upper and lower layers of lime-soil compaction distance shall not be
less than 500mm.
3.9-ash backfill each RAM (pressure) after
real, should be based on norms of the cutting ring sampling, measure the
density of dust, when you meet the design requirements, to make the casting of
a layer of dust on it.
Penetration Tester check the dust mass,
field tests should be conducted to determine the specific requirements for
penetration. Ring cutter soil compaction factor identified by dy, typically
0.93~0.95 either according to the provisions of the table 2-2.
Table 2-2 of the density of lime-soil
quality standards
Kinds of lime soil minimum mass density
(g/cm3)
1
2
3 light loam
Clay
Clay 1.55
1.50
1.45
3.10 leveling and acceptance: dust the top
layer is complete, pull or on foot elevation and flatness check, super high
levelled with a spade; low timely fill dirt.
3.11 rain, winter:
3.11.1 pit (Groove) or trench dirt backfill
should be carried out continuously, as soon as possible. Should prevent surface
water into the slot in the construction pit, so as not to collapse or damage on
the base of the slope.
3.11.2 rainy day when rain or drainage
measures should be taken. Has just finished playing or not yet compacted
lime-soil compaction, such as being caught in the rain soaked, stagnant water
and loose dirt should be removed, and to make up for a new lime-soil compacted,
wet dust should be dry, dynamic compaction-compacting.
3.11.3 winter lime-soil material shall not
contain blocks of frozen soil, to do with the sieve, mix with, with, with
cover, seriously implement the provisions, then rub and compaction in layers.
In the loose soil can be allowed to sprinkle salt. Temperature below-10 ℃, not
construction. And a winter program.
4 quality criteria
4.1 project:
4.1.l the soil must meet the design
requirements of the base.
4.1.2 dust dry soil density or penetration
must meet the requirements of specification for design and construction.
4.2 Basic project
4.2.1 the ingredients right, mix evenly
thickness of layered virtual shop meet the requirements, dynamic
compaction-compacting, no loose skin on the surface.
4.2.2 Cha and Cha. Cha place hierarchy, the
method correctly, Cha-dense and smooth.
4.3 allowable deviation, as shown in table
2-3.
Lime soil Foundation tolerance table 2-3
Project tolerance (mm) test method
1
2 top level
Surface flatness of ± 15
15 level or cable and check
2m on foot and wedged feeler Gage check
5 finished product protection
5.1 construction should pay attention to
properly protect the spud, axis and displacement for preventing collisions and
should be repeated frequently.
5.2 Foundation, foundation walls and
underground waterproofing layer, protective layer, and reached through the
foundation wall of the pipeline shall be protected to prevent collisions when
the backfill dirt or damage.
5.3 night-time construction, should arrange
the construction sequence, be equipped with adequate lighting facilities,
preventing the filling thick or mix errors.
5.4 grey soil after the time of basic
construction and floor construction or temporary cover, preventing the
sprinkling rain.
6 quality problems to be noticed
6.1 is not required for the determination
of dry soil mass density: lime-soil backfill during construction, remember that
each layer of lime-soil compacted after determining dry mass density, meets
those requirements, to top of the casting dust. And included in the test report,
indicating the species, soil mix, testing dates, number of layers (steps),
conclusions, test signature, and so on. Density meets the design requirements
of the position at the end, should have the treatment and re-inspection result.
6.2 to reserve, answered Cha does not meet
the requirements: lime soil construction in strict implementation of the
provisions of the Cha. When lime-soil Foundation level is not at the same time,
shall be made in step, upper and lower dust Cha distance shall not be less than
500mm. Cha Cha should be vertically aligned.
6.3 lime block curing bad: carefully sift
grain too large, causing particles water cure volume expansion, will transform
the upper layer, base arch cracked. Consolidation will seriously Hydrated lime,
the screening requirements.
6.4 dust mixture ratio is not accurate: no
seriously standard bucket and Hydrated lime for soil, or to spend lime powder
sprinkled on the soil surface, mixing is not uniform, the result will be
inconsistent lime soil base hard and soft, dry soil density difference too
much. Should do a measurement.
6.5 dirt surface too large, resulting in
concrete layer is too thick or too thin on the ground, causing ground cracking
and hollowing. Carefully check the dirt surface elevation and flatness.
6.6 rain, winter can't do dirt work, with
due regard to modify the design. You should make good rainy season, the winter
programme; construction construction plan in the technical measures to prevent
lime-soil quality rework accidents such as blisters, frost heave.
7 quality records
This standard shall meet the following
quality records;
7.1 the construction engineering geology
investigation report of construction sites within the region.
7.2 ground rod sounding record.
7.3 ground covert acceptance record.
7.4 lime-soil test report.
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