Tải bản đầy đủ - 0trang
b. Structures and execution statement of canal section reiforced
machine in about 20m central line of canal to avoid untablize
stone masonry at foot of slope .
* Precast-concrete carpet PDTac-M solution
- PDTAC-M carpet is a kind concrete carpet that automatic
chocking with using a steel net, this one used to protect
for building with flooded bank, they are precast
reinforcement concrete, front surface is hexagonal in
shape, behind surface there are 3 automatic chocking
foots which is hooked, fixed on available steel net. Carpet
pices joined nearly with automatic link in 3 directions and
defending voids to prevent absorbent water flow in bank
running out that damage to stability of slope.
- With this structure, steel net act as buffer float to against
settlement, distribute load regularly of carpet on weak
soil, limit settlement phenomenon on some points of
concrete carpet and 4 edges of one mesh set up a border
to restrain the contact among carpet tiles, the void among
carpet tiles is small, regular enough to form joints which
restrain minimize the bending force on carpet tile, and
stretch force in steel net.
- P§TAC- M precast concrete carpet there are 2 parts: Carpet
net is knitted by steel d6-d8mm to make Sin in shape,
with length from 10-80m, 2.6-3.2m width, around by
border and inner is divided by steel d12-d16mm, then
putting carpet tiles on to make a continuos carpet.
- Concrete carpet is able to up 10-80m length or longer, at
present it is able to cover all slope. the area of carpet can
be changed depending on design, and able to execute 4
carpets about 800m2 per day.
- with flat surface will be easy for running water, make
more beautiful landscaping, environment, Behind surface
is a foot system which is fixed in slope foundation that will
make strong ability in nonslip of carpet tile.
- Carpet is constructed with steel float to against settlement
and could execute in water easy by crane on float, this
automatic-concrete carpet enough stability in long term
even when steel net dusty and break. The weight of one
carpet tile is enough to against running force of water.
- This kind of concrete carpet has been applied to execute
more than 70km to protect river banks and dykes in Long
xuyen city of An giang province/
Hereafter are some pictures expressing structures and
execution method of precast concrete carpet.
P 1: structures of P§tac-M carpet tile
Poto 2,3 : Execution method of P§TAC – M carpet
P 4: P§TAC-M embankment
-Structural description of PDTAC-M carpet
PDTAC-M carpet, there are 2 parts,
First one in water, using steel net to link carpet tiles then
spread carpet in water. Foot of carpet fixed more deeply than
canal bottom 0.5m follow slope direction, purpose of this
work ensure stablity of carpet when carrying out dredge mud
(during operation process).
Second part is one left higher than water level, capet tile will
be installed by man with purpose to make more beautiful.
Under the carpet we use filter-textile, which is designed to
prevent drifting sand of 2c,2d layer.
Carpet boards designed when jointing them in water, it is
still closely enough as engineering requirements.
At 2c layer, to keep the slope stablize, this canal part must
be executed in water and water level must always is the
highest level untill slope finishing reinforcement.
To check flat of slope, we will stick mesurement equipment
of deformation on canal section, thus Owner could supervise
quanlity of canal slope without wading in water.
Advantages of PDTAC -M carpet.
- Cheaper than stone masonry
- Automatic chocking in 3 direction so it is able to defend
- More beautiful than stone masonry
- Execution more quickly and in water but it is still ensure
- More stablely and easy for reparing
There are other reiforcement method of slope as
reiforcement by FS carpet, cocrete, stone carpet, seeding ...
We chose reinforcement of slope by Precast-concrete PDTACM carpet
II.1.2 Line 2: Structures and execution method of Cửa
The Cuadinh cofferdam is located on swampy zone, that
topsoil is mud-clay (2a) layer 3m depth, under is loam 2b
a.Structures of cofferdam (refer to attached drawing)
Basicly, Remove all mud-clay (2a), then fill sand and
imported soil from –3m to +3m with slope factor m=3.
Section of cofferdam is recommended as drawing showed,
with examination of Geo-slope (Seep/w vµ Slope/w)
programe to give out absorbent gradient of lower section is
0.55, slip factor is caculated by Bishop, Kminmin=1.358
The result of stress analysis & deformantion in foudation of
cofferdam has been examined by Plaxis Program and giving
out the tensile force of geotextile fabric is 113.42N/m
b. Execution method of Cua dinh cofferdam (refer to
This line will have one team take responsibility to execute in
accordance with follow steps:
Using Clampshell standing on barge to dredge mud-clay 2a,
throwing into 2 sides to make 2 temporary dykes prevent
water for dry execution. at level +1.5m, the distance of 2
dykes is enough to execute cofferdam inside. with
Clampshell has a capacity 1.2m2 and Barge is 200T.
- Then keeping foudation dry, speading one Geotextile layer
with R=1.5T/m on, after that using special truck to fill sand
on from –3m to 0.0m, and From level 0.0 to +3m will be filled
by soil with step about 30cm per one to compact reaching
- Material used for filling and banking cofferdam will be taken
from specified mines and one part is from excavated soil.
- The directions of execution is showed on drawing.
II.3.Line 3: Execution method
This line is located nearly river so to execute this one, we
use dredger with Barge to carry mud, the direction is from
Dabac river to inner canal, if tidal peak we must pull Dredger
II.4. Structure and execution method of intake bay.
Bach Dang river is affected by tide, current line in river is
included 2 directions, so intake bay must be perpendicular
with current line in river, basicly can be describle as follow
The trash and boom log revetment will devided into 5
opening, one is 10m width, Total length is 50m with bottom
level is –3.5m this work is located at infront of Uongbi bridge
No1 with included trast and log boom system.
to more detail of design refer attached drawings. To
execution this works Contractor will use steel pile to encircle
then pumping water out, driving concrete pile then casting
concrete revetment and other structures.
And 2 abutments will use concrete pile to execute, the
exectuion method in accordance with catalogue hereto.
To against erode of water, in line of intake bay will be also
II.5. Structure and execution method of swing wall of
Design: Foundation of swing wall is concrete pile M300, Wall
open directly to upstream, the level is +3m down to bottom
of canal, with thickness of wall various from 1000mm to
500mm, Refer to drawing attached.
Execution method: Contractor will use steel pile to encircle
then pumping water out, driving concrete pile then casting
concrete revetment and other structures. and it may be use
needle-filter-well t keep foundation dry.