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后压浆施工技术规范
Technical
Specification of Post Pressure Grouting
一、设计
design
1
、对桩径
800mm
桩长
40m
采用复式注浆法即桩端与桩侧注浆法。桩端与桩侧
各对称
安装二根注浆管。
Double pressure
grouting to be adopted for 800mm dia./40m long
pile, i.e.
side and bottom grouting.
Two grouting pipes shall be arranged for bottom
and
side respectively.
2
、注浆位臵
grouting
position
：
1
）桩端注浆：注浆花管应埋入终孔孔底下
100-300mm
，
Bottom grouting:
grouting pipe should
penetrate 100-300mm below the
bottom of
borehole.
2
）桩侧注浆：桩长
30m/40m
的桩注浆花管应设臵在地面下
20m/25
m
处的砂层
中，
或者
< br>15-20m/20-25m
处的砂层与粘性土层界面上
500mm
处，
具体位臵由各区段
工勘
探孔及桩钻进时的反渣情况综合判断确定，同一建（构）筑物注浆位臵宜相同
（详见附图
二）。
Side grouting: grouting
pipes for 30m/40m piles should be embedded in sand
strata 20m/25m underground, or 500mm
above the intersection of
15-20m/20-25m
silty sand and clay sand. Exact positions shall be
reasonably
decided as per out-coming
soil condition in test boring and actual piling.
Grouting
position for the same
structure (building) is preferably identical. (see
diagram 2)
3
、注浆管
的长度：由实际施工的孔深确定，其长度为实际孔深
+0.6m
。
Length of grouting pipe:
shall be as per actual
borehole depth and should
be 0.6m
longer than borehole depth.
4
、注浆管采用
DN20
、δ
=2.75
的焊管，相邻注浆管采用丝扣连接，并用
< br>14#
铁丝绑扎固定在钢筋笼的外侧。
注浆管底端用丝堵
封闭，
距底端
400mm
长度范围内<
/p>
对称均匀钻
12
个φ
6
的注浆孔，
用胶带及图钉封孔。
注浆管顶部应高出砼面
0.5
以上，
且
高出地面
0.2-0.3m
。
管顶要用丝堵封闭且用不同颜色的胶带缠绕，
将桩底注浆管
与桩侧注浆管区分开来。
Grouting
pipe type: DN20
、δ
=2.75
welded pipe to be adopted, and adjacent
1
pipes to be
connected with threads and tightly fixed to the
outer side of rebar cage
with 14#
galvanized wire. Bottom end of grouting pipe to be
sealed with plug and
12 nos
of
φ
6 grouting holes to be
evenly drilled within the bottom 400mm of
grouting pipe, and the same should be
sealed with tapes and thumbnails. Top of
grouting pipe should be 0.5m above
concrete level and 0.2-0.5m above ground
level. Pipe tops to be sealed with
plugs and wrapped with tapes of different colors
to differentiate bottom and side
grouting pipes.
5
、注浆压力：桩侧：桩长
30m
为
1.5 MPa
，桩长
40m
为
2.0
MPa
；桩端：桩长
30m
为
2.0 MPa
，桩长
40m
为
2.5MPa
。
Grouting
pressure
：
pile
side: 1.5MPa for 30m piles and 2.0Mpa for 40m
piles;
pile bottom: 2.0MPa for 30m
piles and 2.5 for 40m piles.
6
、注浆材料及注浆量：采用普通
42.5
级水泥，每根桩水泥用量暂定为
3.0t
。初
始压浆时水灰比为
1
：
1
，体积为
200L
，余下水灰比为<
/p>
08:1
。
Grouting material and quantity: normal
OPC 42.5 grade cement to be
adopted and
30t of cement for each pile. Initial grouting
water-cement ratio should
be 1:1,
volume should be 200L and trailing water-cement
ratio should be 8:1.
7
、成桩
2
天后开始注水打开通道。
28
天内进行注浆。
Water to be
injected into grouting pipes after 2 days of pile
concreting
completion so as to clean
grouting pipes and pressure grouting to be carried
out
within 28 days of pile completion <
/p>
8
、注浆顺序：先桩侧后桩底，二者时间间隔不小于
2
小时。先外围后中间。注
浆点距未施工或者正在施
工的桩的最小距离为
15m
。
Grouting sequence: first pile sides and
then pile bottom and minimum 2 hours
interval to be maintained between the
two; first outer and then inner and minimum
clearance between pressure grouting
pile and installation on-going piles should
be at least 15m.
9
、终止注浆条件：采用注浆压力与
注浆量双控，以注浆量控制为主，注浆压
力控制为辅。
Condition for pressure grouting
suspension: two references to be considered,
i.e. grouting pressure and grouting
quantity whereas the latter should be taken as
2
primary and
the former secondary.
二、范围<
/p>
scope
：
1
、烟囱基础（内
4
圈除外）；
446
根
Chimney foundation (excluding inner 4
circles)
，
total 446nos
2
、全部三个水塔的环基基础；每个水塔约
552<
/p>
根，共
1656
根
Ring beam foundation of three CT
552nos
，
total 1656nos
3
、其他需要后压浆的基础，现场与业主协商确定。
Other foundations that requires
pressure grouting
—
to be
discussed with the
Owner at site.
三、施工方案
methodology
1
、工艺流程
technique
steps
：
后压浆工艺流程为：
制作压浆管
→安装压浆管
→
检查压浆管质量
→
灌注混
凝
土→打开压浆管，
并做注水试验→配制水泥浆，
桩侧压浆→
配制水泥浆，
桩底压
浆→养护。
Steps of
post pressure grouting: grouting pile fabrication
---grouting pipe
installation---
grouting pipe quality inspection-concreting---open
pressure grouting
pipe and water
injection test---cement slurry mixing and side
grouting---cement
slurry mixing and
bottom grouting---curing
2
、注浆管制作
grouting
pipe fabrication
：
1
）注浆管材料
grouting
pipe material
：
采用
DN20
壁厚
2.75mm
的焊管。
Welded pipe of
DN20 and 2.75mm thick
2
）注浆管的
制作
fabriaction
：
采用车丝机在焊管的二端车丝，每个车丝段的长度为
50mm
，车出来的丝应平
正圆滑，不得出现偏丝滑丝，若出现应用切割机将该
段切除后重新车丝。车丝后应
用生胶带缠绕
3-5
圈，然后在
下节管的上端安装直通并拧紧
。安装时应
用管钳拧紧，
防止在整个注浆管管道安装过程中出现脱离或者是不封闭，导致漏浆现象的
发生。
同时根据实际孔深制作相应的短节，短节的二端按上述要求车丝。
3
Thread to
be made at two ends of grouting pipe with
threading machines and
length of each
thread should be 50mm. Threads made should be
smooth and
even, and distorting or
sliding threads are not allowed. In case distorted
or slide
threads are made, the same
should be chopped and remade. Finished threads
should be wrapped with 3-5 rounds of
thread tape, and then straight coupling shall
be tightly fixed to one end of the pile
with pipe wrench so as to avoid leakage or
disconnection during pressure grouting.
Grouting pipes shall be prepared in view
of pile depth and threads of
connections shall be made as required.
3
）注浆花制作
perforated
grouting pipe
距底端
400mm
内对称均布钻
12
个φ
6<
/p>
的孔，在每对孔的断面用胶带缠绕
3
圈，
然后将图钉安放在孔的位臵，
再在图钉的外侧用高压绝缘胶带缭
绕
3-5
圈
（详见附图
3
）。桩底注浆花管底口采用焊接方式将圆钢车成的圆锥状丝堵焊牢密封（详见
附
图
3
）。桩侧注浆花管的底口采用相
配套的外丝堵密封。
12 nos of holes to
be symmetrically and evenly drilled within bottom
400mm
of grouting pipe and wrap 3-5
rounds of tapes around each pair of holes and then
pin thumbnails at the holes, then again
wrap 3-5 round of high-voltage insulation
tape outside the nails (see diagram 3).
The bottom of the grouting pipe shall be
sealed with suitable external plug.
3
、注浆管的安装
< br>installation of grouting pipe
：
1
）注浆管位臵及长度的确定
grouting position and pipe
length
：
< br>（
1
）桩底注浆管的底端应设臵在实际孔深以下
100mm
处，注浆花管应埋设在
沉渣及孔底原
状土中。长度为实际孔深
+0.1m
。
烟囱为
41m
（
-5
< br>～
-46 m
），水塔为
43.
8m
（
-1
～
-44.8 m
）。
Bottom
grouting pipe should penetrate 100mm under the
bottom of borehole
and perforated
section should be embedded in bottom sediment.
Pipe should be
0.1m longer than actual
borehole depth.
（
2
）桩侧注浆管应设臵在距设计桩底标高约
15m
处的粉砂层中
。长度为
25m+
桩位处自然地面至设计桩顶的距离。
烟囱（
-5
～
-29
m
）与水塔（
-1
～
< br>-25m
）均为
24m
。
4
Side
grouting pipe should be embedded in silty sand 15m
above design pile
bottom. The length of
grouting pipe should be 25m plus the distance
between
ground elevation and design
pipe top elevation.
（
3
）同一断面上桩底注浆管与桩侧注浆管应对称均布。
Bottom grouting pipe and sides
grouting pipe on the same section should be
arranged symmetrically.
2
）注浆管安装
grouting
pipe installation
：
（
1
）二次清孔期间，应将注浆管运到桩孔附近，并根据实
际孔深按上述要求
核算注浆管的长度，无误后方可安装。
During second time flushing, grouting
pipes should be gathered around
borehole. Grouting pipe length should
be calculated exactly according to actual
borehole depth and be lowered after
sound confirmation.
（
2
）注浆的安装与钢筋笼的安放同时进行。桩底注浆管底部
500mm
处应内折
15
°
防止在
注浆管下放过程中挂碰孔壁。
Grouting pipe
should be lowered together with rebar cage.
Grouting pipe
should be bended inward
with 15-25
°
angle
at 500mm above pipe end to avoid
clashing with borehole sides while
lowering.
（
3
）注浆管与钢筋笼的主筋采用
14#
铁丝绑扎固
定。注浆管绑扎在钢筋笼的外
侧。桩底注浆管的底部
15m
范围内每
2m
设一绑扎点，其余部位及桩侧
注浆管每
4m
设一绑扎点。
Grouting pipe should be fixed with main
reinforcement bar using 14#
galvanized
wire. Grouting pipe should be fixed outside of
cage. Bottom grouting
pipe should be
fixed every two meters with cage within the bottom
15m, and
remaining part and side
grouting pipes to be fixed with cage every 4
meters.
（
4
）相邻上下节注浆管采用带丝扣的直通连接，安装时应用管钳拧紧，防止
在整
个注浆管管道安装过程中出现脱离或者是不密实导致漏浆现象的发生。
Adjacent
two grouting pipes shall be tightly connected with
straight coupling using
pipe wrench so
as to avoid disconnection or leakage during
grouting.
（
5
）在钢筋笼孔口搭接前，应对压浆管进行注水，检查其密封性，当压浆导
5
管内注满清水后，水面能够保持稳定且不升降，证明密封完
好。否则，提起钢筋笼
检查漏水原因，满足要求后方可下另一节笼，下笼时要徐徐放入，
严禁用力墩下或
者扭动。
When lapping rebar cages at borehole,
water should be injected to grouting
pipe
to
check
its
imperviousness.
The
same
can
be
confirmed
if
level
of
clean
water in grouting pipe remains steady.
Otherwise, cage should be lifted to find out
leaking points, after which the next
section of cage can be lowered. Cage should
be lowered with care and jerking or
sudden free fall is not allowed.
（
6
）下笼结束后，在压浆管上口拧上堵头，以免
杂物掉入压浆导管内而使管
路不畅。并用不同颜色的油漆将桩底注浆管与桩侧注浆管区分
开来，以免混淆。
After full cage is
lowered, grouting pipe top opening should be
sealed to avoid
foreign stuff from
falling in and blockage. Exposed grouting pipes
should be
painted with different colors
to differentiate bottom and side grouting pipes.
4
、注浆
pressure -grouting
1
）注浆设备：
Grouting
equipments
（
1
）
采用
SNS-6/10
注浆泵，
注浆额定压力为
10MPa
，
额定流量为
100L/min
。
<
/p>
（
2
）压浆泵控监测压力表为
2.5
级
16MPa
抗震
压力表。
(3)
浆液搅拌机为与注
浆泵相匹配的
YJ-340
型液浆搅拌机，容积为
0.34m3
，
功率
4kW
。
(4)
水泥浆液的输浆管应采用高压流体泵送软管，额定压力不小于
20MPa
。
1) Use SNS-6/10
grouting pump, grouting rated pressure 10MPa,
rated flow
100L/min.
2)
Pressure gauge for grouting pump shall be Grade
2.5 16MPa seismic
pressure gauge.
3) Grouting batching machine is YJ-340
batching machine which matches
with
grouting pump, Volume of 0.34m3, power 4kW.
4) Grout transmission pipe shall be
high pressure flow-pumped soft pipe,
rated pressure shall be minimum 20MPa.
2
）注浆材料及注浆量：
grouti
ng material and volume
6
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