Construction Technology of Concrete Retaining Wall
1. Excavation of foundation trench: Excavation of foundation trench in
this project is carried out by excavator and manual cooperation. The
foundation excavation is carried out in stages with wall construction.
First, the laying-out line is measured, the middle line and side line of
excavation are determined, the starting point and end point are
determined, the pile mark is set up, the elevation and excavation depth
are indicated, the excavation is carried out with a 1 m3 backhoe
excavator, and the surplus earth is loaded outside the truck to
transport the discarded soil. In the construction process, drainage
ditches and catchment resistance should be set up according to the
actual needs to carry out construction drainage, so as to ensure that
the working face is dry and the base is not immersed in water.
2. Foundation treatment: When a silt or soft soil layer is found in the
excavated foundation, soil replacement treatment is required, which is
submitted to the supervisory engineer and the owner for approval before
construction is carried out.
3. Construction of gravel cushion: Cast-in-place reinforced concrete
retaining wall according to design drawings. The foundation is paved
with 20 cm thick gravel cushion and rammed into the foundation soil with
a rammer. In order to increase the friction coefficient of the base.
The base cushion of prefabricated retaining wall is 10 cm thick of C10
4. Installation of reinforcing bars: First, the cast-in-place
reinforcing bars are installed, and the vertical reinforcing bars of the
wall are prefabricated. After the foundation is poured with concrete
and the concrete reaches 2.5 Mpa, the reinforcing bars of the wall are
The foundation reinforcement of prefabricated reinforced concrete
retaining wall is installed twice. The first time is to install the
bottom reinforcement. The foundation reaches a certain strength. After
the prefabricated wall is installed, the second-order foundation
reinforcement is installed.
5. Cast-in-place concrete foundation: according to the length of the
retaining wall section, the whole section is irrigated one-time, the
surface of the clean cushion is measured and laid out, and the vertical
mould is irrigated.
6. Cast-in-place wall concrete: The joint of cast-in-place reinforced
concrete retaining wall and foundation should be treated according to
construction joints, i.e. first chiseling, chiseling the loose part of
concrete and floating slurry, cleaning with water, and then erecting the
wall formwork. When concrete begins to pour, first brush a layer of
cement slurry or cushion a layer of 2-3 cm thick 1:2 cement mortar on
the joint surface and then pour the wall concrete.
The wall formwork is assembled with seven smooth splints, the vertical
spacing of 8 *10 cm is 40 cm, the steel tube is used as the enclosure,
the wooden silk of 8 *10 cm is used as the diagonal brace to support,
the side die is positioned by the bolt of 16, the bolt spacing is 80 cm,
and the bolt perforation can be made by the rigid plastic pipe with the
inner diameter of 20-25 cm. When removing the die, the bolt is pulled
out, and then the bolt hole is blocked by 1:2 cement mortar. The wall
formwork height is apparent. In general, the method of dividing one-time
die into top and second-time die is one-time die within 4 meters of
height, and divisible two-time die over 4 meters of height can also be
one-time die. When the falling height of concrete is more than 2.0m, the
concrete should be transported into silos by series barrels or by
manual ash separation to avoid the segregation of concrete. Concrete is
transported from concrete processing plant to site by concrete truck.
Platform is erected on the top of the wall, concrete is lifted by crane
to the platform for pouring. Concrete pouring is carried out evenly from
the lower part. The thickness of the layer is generally 30n. Inserted
vibrator is used to vibrate the concrete. The moving distance of the
vibrating rod should not exceed 1.5 times of its acting radius, and the
distance between the concrete truck and the side formwork should be kept
5-10cm, so as not to leak or overvibrate. In the process of concrete
pouring, if the surface bleeds too much, the water should be drained
away in time or water reduction measures should be taken layer by layer,
so as to avoid loose roof. After pouring to the top, the surface should
be smeared in time, after slurry fixing, and then twice to make the
In the process of concrete pouring, carpenters, reinforcing bars,
electricians and test workers should be sent on duty on site to find
problems and deal with them in time.
The concrete strength parts shall be made at random at the site of
mixing or irrigating, and no less than two groups of specimens (3 pieces
in each group) shall be made in each working class.
After grouting, concrete should be sprinkled and maintained in time. The
curing time should not be less than 7 days. The side formwork of the
wall can be removed 24 hours at room temperature. When removing the
formwork, special care must be taken to avoid damaging the wall.
7. Treatment of expansion joints, settlement joints and drainage holes:
The expansion joint and the settlement width of the reinforced concrete
retaining wall are now watered 2cm (sandwiched 2 centimeters thick foam
board or wood plank in the construction joint, and after the
construction is finished, wood or foam board is drawn) from the top of
the wall to the base, and the three sides of the inside, outside and top
sides of the wall are filled with pitch hemp, deep 15cm.
擋土墻泄水孔為ф10cm的硬質空心管，泄水孔進口周圍鋪設50×50×50cm碎古，碎古外包土工布，下排泄水孔進口的底部鋪設30cm厚的粘土流水槽鋼模具 不銹鋼鑄件 扭王字塊模具 井蓋鋼模具 標志樁模具 調匝式消弧線圈 風冷控制柜 烤漆龍層并歷夯實。
The drain hole of retaining wall is a rigid hollow pipe of 10cm. The
drain hole is surrounded by 50 *50 *50cm crushed ancient materials,
which are wrapped with geotextiles. The bottom of the lower drain hole
is laid with 30 cm thick clay layer and compacted