U.S. patent application number 17/294658 was filed with the patent office on 2022-09-29 for special-grouting-based grouting system with adjustable moving cavity pressure and grouting method thereof.
The applicant listed for this patent is ECONOMY AND TECHNOLOGY RESEARCH INSTITUTE, GANSU ELECTRIC POWER CORPORATION, STATE GRID GANSU ELECTRIC POWER CORPORATION. Invention is credited to Ning AN, Xuefeng FAN, Bingbin FU, Mingjun JIANG, Shijun WANG, Zhe ZHANG.
Application Number | 20220307216 17/294658 |
Document ID | / |
Family ID | 1000006452258 |
Filed Date | 2022-09-29 |
United States Patent
Application |
20220307216 |
Kind Code |
A1 |
WANG; Shijun ; et
al. |
September 29, 2022 |
SPECIAL-GROUTING-BASED GROUTING SYSTEM WITH ADJUSTABLE MOVING
CAVITY PRESSURE AND GROUTING METHOD THEREOF
Abstract
A grouting system with an adjustable moving cavity pressure. The
grouting system includes a master grouting pipe and a plurality of
grouting valve pipes connected to the master grouting pipe, each
grouting valve pipe is in an annular space within a borehole wall,
the grouting valve pipe includes a grouting valve pipe body, and a
spraying valve port is on the grouting valve pipe body. A grouting
pipe, an air injection pipe and a movable piston are inside the
grouting valve pipe body. The air injection pipe is connected with
the movable piston to apply an air pressure into the movable
piston, and the movable piston applied with the air pressure
expands in volume to form a closed cavity between a lower part of
the movable piston and the grouting valve pipe body, so that
grouting is performed according to the position of the movable
piston.
Inventors: |
WANG; Shijun; (Lanzhou City,
CN) ; FAN; Xuefeng; (Lanzhou City, CN) ; FU;
Bingbin; (Lanzhou City, CN) ; AN; Ning;
(Lanzhou City, CN) ; JIANG; Mingjun; (Lanzhou
City, CN) ; ZHANG; Zhe; (Lanzhou City, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ECONOMY AND TECHNOLOGY RESEARCH INSTITUTE, GANSU ELECTRIC POWER
CORPORATION
STATE GRID GANSU ELECTRIC POWER CORPORATION |
Lanzhou City
Lanzhou City |
|
CN
CN |
|
|
Family ID: |
1000006452258 |
Appl. No.: |
17/294658 |
Filed: |
December 8, 2020 |
PCT Filed: |
December 8, 2020 |
PCT NO: |
PCT/CN2020/134502 |
371 Date: |
May 17, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E02D 5/34 20130101; E02D
2250/003 20130101 |
International
Class: |
E02D 5/34 20060101
E02D005/34 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 23, 2020 |
CN |
202011142772.0 |
Claims
1. A special-grouting-based grouting system with an adjustable
moving cavity pressure, comprising a master grouting pipe and a
plurality of grouting valve pipes connected to the master grouting
pipe, wherein each grouting valve pipe is located in an annular
space within a borehole wall; the grouting valve pipe comprises a
grouting valve pipe body, and a spraying valve port is disposed on
the grouting valve pipe body; wherein a grouting pipe, a air
injection pipe and a movable piston are disposed inside the
grouting valve pipe body, an outer diameter of the movable piston
is smaller than an inner diameter of the grouting valve pipe body,
the air injection pipe is connected with the movable piston to
apply an air pressure into the movable piston, and the movable
piston applied with the air pressure expands in volume to form a
closed cavity between a lower part of the movable piston and the
grouting valve pipe body, so that grouting is performed for the
grouting valve pipe body according to the position of the movable
piston; the grouting pipe penetrates through the movable piston to
perform grouting into the grouting valve pipe body.
2. The special-grouting-based grouting system with an adjustable
moving cavity pressure according to claim 1, wherein a different
grouting pressure in each grouting valve pipe is designed by
adjusting a size of the air pressure applied into the movable
piston through the air injection pipe.
3. The special-grouting-based grouting system with an adjustable
moving cavity pressure according to claim 1, wherein a plurality of
spraying valve ports are disposed, and a valve port protection pad
is fixedly connected at each spraying valve port to temporarily
prevent a target object from blocking the spraying valve port
during mounting.
4. The special-grouting-based grouting system with an adjustable
moving cavity pressure according to claim 3, wherein the valve port
protection pad is fixed at the corresponding spraying valve port in
a binding manner.
5. The special-grouting-based grouting system with an adjustable
moving cavity pressure according to claim 1, wherein the air
injection pipe is connected with an air supply apparatus which
injects air into the air injection pipe.
6. A special-grouting-based grouting method with an adjustable
moving cavity pressure using the special-grouting-based grouting
system with an adjustable moving cavity pressure according to claim
1, comprising the following steps sequentially: at step S1,
arranging each grouting valve pipe in an annular space within a
borehole wall after drilling, and mounting the grouting pipe, the
air injection pipe and the movable piston in the grouting valve
pipe body while ensuring the connections of the device are made
fully and reliably; at step S2, injecting air into the air
injection pipe to enable the movable piston connected with the air
injection pipe to gradually expand so as to form a closed cavity
between the lower part of the movable piston and the grouting valve
pipe body; at step S3, when different grouting pressures are needed
in different grouting valve pipes according to a geological
condition, adjusting the grouting pressures in different grouting
valve pipes according to different amounts of air injected into the
air injection pipes in different grouting valve pipes; at step S4,
when a different grouting pressure is needed in the same grouting
valve pipe, forming a closed cavity with a different height between
the lower part of the movable piston and the grouting valve pipe by
injecting a different amount of air, so as to adjust the grouting
pressure in the same grouting valve pipe; and at step S5, repeating
step S3 or S4 until the entire grouting process is completed.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the field of grouting
technologies, and in particular to a special-grouting-based
grouting system with an adjustable moving cavity pressure and a
grouting method thereof.
BACKGROUND
[0002] In foundation treatment engineering, pressure grouting is a
conventional approach and pressure control becomes a difficult
point during a pressure grouting process. A pressure control value
is closely related to a geological condition and a buried depth of
a pressure grouting mouth, which brings a very severe challenge to
the pressure control of single-pipe pressure grouting. For a
conventional pressure grouting pipe, the grouting pressure in a
single pipe is consistent, and it is difficult to realize different
pressures at different depths or different pressures at different
geological soil layers.
[0003] In a grouting foundation treatment technique, treatment
effects and engineering construction costs largely depend on a
grouting amount, and the grouting amount largely depends on a
grouting pressure. If the pressure is too small, slurry cannot be
effectively penetrated and diffused into a soil body; if the
pressure is too large, ground heave occurs easily. Thus, the proper
control of the grouting pressure can effectively achieve the
treatment effects and control the construction costs.
[0004] Since the existing grouting pipe and grouting valve pipe can
only achieve a single grouting pressure, and thus cannot control
different grouting pressures at different depths and different
geological soil layers. At present, in most cases, several grouting
pipes with a single spraying valve port are adopted to perform
grouting for soil layers at different depths, causing the increased
number of holes and the increased number of grouting pipes,
prolonging the construction period, and increasing the engineering
construction costs.
SUMMARY
[0005] An object of the present disclosure is to provide a
special-grouting-based grouting system with an adjustable moving
cavity pressure. The grouting system can perform pressure
adjustment for a single grouting valve pipe, thereby realizing
special grouting for different target layers and improving site
construction efficiency.
[0006] To achieve the above object, the present disclosure adopts
the following technical solutions.
[0007] A special-grouting-based grouting system with an adjustable
moving cavity pressure includes a master grouting pipe and a
plurality of grouting valve pipes connected on the master grouting
pipe. Each grouting valve pipe is located within an annular space
within a borehole wall. The grouting valve pipe includes a grouting
valve pipe body, and a spraying valve port is disposed on the
grouting valve pipe body.
[0008] A grouting pipe, an air injection pipe and a movable piston
are disposed inside the grouting valve pipe body, and an outer
diameter of the movable piston is smaller than an inner diameter of
the grouting valve pipe body. The air injection pipe is connected
with the movable piston to apply an air pressure into the movable
piston, and the movable piston applied with the air pressure
expands in volume to form a closed cavity between a lower part of
the movable piston and the grouting valve pipe body. Grouting is
performed into the grouting valve pipe body according to the
position of the movable piston.
[0009] The grouting pipe penetrates through the movable piston such
that grouting is performed into the grouting valve pipe body
through the grouting pipe.
[0010] In a preferred solution of the present disclosure, different
grouting pressures in different grouting valve pipes are designed
by adjusting the air pressure applied into the movable piston
through the air injection pipe described above.
[0011] In another preferred solution of the present disclosure, a
plurality of spraying valve ports described above are disposed, and
a valve port protection pad is fixedly connected at each spraying
valve port so as to temporarily prevent a target object from
blocking the spraying valve port during mounting.
[0012] Preferably, the above valve port protection pad is fixed at
the corresponding spraying valve port in a binding manner.
[0013] Preferably, the above air injection pipe is connected with
an air supply apparatus which injects air into the above air
injection pipe.
[0014] Another object of the present disclosure is to provide a
special-grouting-based grouting method with an adjustable moving
cavity pressure. The grouting method includes the following
steps.
[0015] At step S1, each grouting valve pipe is arranged in an
annular space within a borehole wall after drilling, and a grouting
pipe, an air injection pipe and a movable piston are mounted in a
grouting valve pipe body in such a way that their connections are
made reliably.
[0016] At step S2, air is injected into the air injection pipe, so
that the movable piston connected with the air injection pipe
gradually expands to form a closed cavity between a lower part of
the movable piston and the grouting valve pipe body.
[0017] At step S3, when different grouting pressures are needed in
different grouting valve pipes according to a geological condition,
the grouting pressures in different grouting valve pipes are
adjusted according to different amounts of air injected into the
air injection pipes in different grouting valve pipes.
[0018] At step S4, when a different grouting pressure is needed in
the same grouting valve pipe, a closed cavity with a different
height is formed between the lower part of the movable piston and
the grouting valve pipe by injecting a different amount of air, so
as to adjust the grouting pressure in the same grouting valve
pipe.
[0019] At step S5, step S3 or S4 is repeated until the entire
grouting process is completed.
[0020] Compared with the prior art, the present disclosure brings
the following beneficial effects.
[0021] The present disclosure provides a special-grouting-based
grouting system with an adjustable moving cavity pressure. By
applying a different air pressure into the movable piston through
the air injection pipe, a closed cavity with a different height is
formed to adjust the pressure in a single grouting valve pipe.
Thus, multi-layer grouting can be realized for the single grouting
valve pipe, and different grouting pressures may be designed for
different layers according to geological condition and spraying
depth. In this way, special grouting may be performed for a target
soil layer by using the grouting valve pipe of the present
disclosure, thereby realizing multi-layer grouting using the single
grouting valve pipe. Therefore, the site construction efficiency
can be greatly improved, additional drilling is avoided, and
engineering construction costs are saved.
[0022] In the present disclosure, a plurality of grouting valve
pipes are connected with the master grouting pipe to realize
pressure adjustment to different grouting valve pipes. For example,
different pressures may be maintained in different grouting valve
pipes by applying different air pressures into the movable pistons
through the air injection pipes in different grouting valve pipes.
Therefore, site construction requirements can be satisfied.
[0023] Compared with the prior art, the special-grouting-based
grouting system with an adjustable moving cavity pressure in the
present disclosure can realize the pressure adjustment to the
single grouting valve pipe or to different grouting valve pipes,
and thus it is worth promotion and application.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The present disclosure is further described below in
combination with accompanying drawings.
[0025] FIG. 1 is a structural schematic diagram of a single
grouting valve pipe according to the present disclosure.
[0026] FIG. 2 is a structural schematic diagram of a
special-grouting-based grouting system with an adjustable moving
cavity pressure according to the present disclosure.
[0027] Numerals of the drawings are described as follows:
1-grouting valve pipe body, 2-movable piston, 3-grouting pipe,
4-air injection pipe, 5-spraying valve port, 6-valve port
protection pad, 7-slurry supply apparatus, and 8-air supply
apparatus.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] The present disclosure provides a special-grouting-based
grouting system with an adjustable moving cavity pressure. To make
the advantages and technical solutions of the present disclosure
clearer, the present disclosure will be described in detail below
in combination with specific examples.
[0029] Unless otherwise clearly specified, the term "include" or
its variations such as "comprise" in the entire specification and
the claims will be understood as including the stated parts or
components rather than excluding other parts or other
components.
[0030] In the specification, for convenience of description, the
relative spatial terms such as "under", "below", "lower", "over",
"above" and "upper" may be used to describe a relationship between
one component or feature and another component or feature in the
drawings. It is to be understood that the relative spatial terms
are intended to include different directions in which an object is
used or operated in addition to the directions drawn in the
drawings. For example, if an object in the drawing is turned over,
a component "under" or "below" another component or feature will be
described as oriented to be "above" the another component or
feature. Therefore, the exemplary term "below" may include two
directions. i.e. below or above. The component may also have
another orientation (for example, rotated by 90 degrees or in other
orientations), and the relative spatial terms used herein are to be
explained accordingly.
[0031] The present disclosure provides a special-grouting-based
grouting system with an adjustable moving cavity pressure. As shown
in FIG. 2, the grouting system mainly includes a master grouting
pipe and a plurality of grouting valve pipes connected to the
master grouting pipe. During actual grouting, each grouting valve
pipe is located in an annular space within a borehole wall. For the
grouting valve pipe as a main improvement of the present
disclosure, grouting is performed to the master grouting pipe
through a slurry supply apparatus 7, and then performed to each
grouting valve pipe through the master grouting pipe, as shown in
FIG. 1. The grouting valve pipe includes a grouting valve pipe body
1, a plurality of spraying valve ports 5 are disposed on the
grouting valve pipe body 1, the plurality of spraying valve ports 5
may be for example, arranged in equal distance from bottom to top,
or may be disposed at the same horizontal position of the grouting
valve pipe body 1. The disposal of the spraying valve port 5 may be
reasonably made by persons skilled in the art according to
different geological conditions. When grouting is performed into
the grouting valve pipe body through a grouting pipe, grouting is
performed into the surrounding soil body through the spraying valve
ports 5.
[0032] A grouting pipe 3, an air injection pipe 4 and a movable
piston 2 are disposed inside the grouting valve pipe body. The
grouting pipe 3 may be made of a common material of a grouting pipe
for grouting in the prior art. The air injection pipe 4 is
connected with an air supply apparatus 8 to provide air. An outer
diameter of the movable piston is smaller than an inner diameter of
the grouting valve pipe body. When air is supplied to the movable
piston, the movable piston may expand to form a closed space with
the grouting valve pipe body. The bottom of the air injection pipe
is connected with the movable piston, and the top of the air
injection pipe is connected with the air supply apparatus. When the
air supply apparatus supplies air into the air injection pipe, the
air enters the movable piston from the bottom of the air injection
pipe, so that an air pressure is applied into the movable piston
through the air injection pipe. The movable piston applied with the
air pressure expands in volume to form a closed cavity between a
lower part of the movable piston and the grouting valve pipe body.
The grouting is performed into the grouting valve pipe body
according to the position of the movable piston.
[0033] The above grouting pipe penetrates through the movable
piston to perform grouting into the grouting valve pipe body.
[0034] As a preferred solution of the present disclosure, to
prevent the surrounding soil from blocking the spraying valve ports
during the mounting of the apparatus, a valve port protection pad 6
is fixed at each spraying valve port. The valve port protection pad
6 has a larger area than the spraying valve port, and preferably is
fixed at the spraying valve port in a binding manner.
[0035] In the present disclosure, different pressures may be
applied to a single grouting valve pipe. For example, during a
grouting process, a certain amount of air is firstly injected into
the movable piston to enable the movable piston to expand to a
certain height, and at this time, a closed cavity is formed between
the lower part of the movable piston and the grouting valve pipe
body, and grouting can be performed by applying a pressure to the
grouting pipe at this time. Then, air injection into the movable
piston is continued to enable the movable piston to further expand
to a height greater than that of the initial expansion, so as to
form another closed cavity between the lower part of the movable
piston and the grouting valve pipe body, and thus grouting can be
performed by applying a different pressure to the grouting pipe at
this time.
[0036] In the present disclosure, the pressure of the single
grouting valve pipe can be adjusted during one-time grouting. For
example, different amounts of air are injected into different
grouting valve pipes to form closed cavities with different heights
between the movable pistons and the grouting valve pipe bodies,
thereby realizing grouting by applying different pressures to the
grouting pipes.
[0037] The grouting method of the present disclosure will be
further described below in combination with the above
special-grouting-based grouting system with an adjustable moving
cavity pressure.
Example 1
[0038] When it is required to apply different pressures to a single
grouting valve pipe, multi-layer grouting may be realized using the
single grouting valve pipe by forming closed cavities at different
heights between the movable piston and the grouting valve pipe
body, with a different grouting pressure designed for each layer
according to the geological condition and the spraying depth. In
this way, special grouting may be performed to the target soil
layer and multi-layer grouting may be realized using the single
grouting pipe in the present disclosure, thereby improving the site
construction efficiency.
[0039] The grouting method specifically includes the following
steps.
[0040] At step 1, the position of the spraying valve port is
designed according to the geological condition.
[0041] At step 2, on-site paying-off is performed to determine the
position of the grouting valve pipe and a borehole is drilled using
a well drilling machine.
[0042] At step 3, the grouting valve pipe body is mounted, and the
movable piston, the grouting pipe and the air injection pipe are
placed inside the grouting valve pipe body according to the design
of the present disclosure.
[0043] At step 4, a grouting position is determined, and
pressurized air injection is performed to the movable piston to
form a closed cavity.
[0044] At step 5, pressurized grouting is performed for the
grouting pipe by selecting a designed pressure according to factors
such as geological condition and grouting depth.
[0045] At step 6, the movable piston is moved to above the upper
layer of the spraying valve ports, and injected with air under
pressure again to form a second closed cavity.
[0046] At step 7, the pressurized grouting is performed for the
grouting pipe by selecting another designed pressure according to
factors such as geological condition and grouting depth.
[0047] At step 8, steps 6 and 7 are repeated until the entire
grouting process is completed.
Example 2
[0048] As shown in FIG. 2, when the grouting system is applied to
different strata such as sand layer and soil layer, it is required
to apply different pressures to different grouting valve pipes. At
this time, grouting is performed for different grouting valve pipes
by forming closed cavities with different heights between the
movable pistons and the grouting valve pipe bodies
respectively.
[0049] The specific grouting method includes the following
steps.
[0050] At step 1, the position of the spraying valve port is
designed according to the geological condition.
[0051] At step 2, on-site paying off is performed to determine the
positions of the grouting valve pipes and boreholes are drilled
using a well drilling machine.
[0052] At step 3, the grouting valve pipe bodies are mounted, and
the movable piston, the grouting pipe and the air injection pipe
are placed inside the grouting valve pipe body according to the
design of the present disclosure.
[0053] At step 4, the grouting position of each grouting valve pipe
is determined respectively, and pressurized air injection is
performed into the respective movable piston of each grouting valve
pipe to form a closed cavity with a different height.
[0054] At step 5, pressurized grouting is performed into each
grouting valve pipe; if the grouting pressure is to be further
adjusted, the adjustment may be performed based on the height of
the closed cavity between the movable piston and the grouting valve
pipe body.
[0055] At step 6, steps 4 and 5 are repeated until the entire
grouting process is completed.
[0056] The preferred examples of the present disclosure are
described above in combination with the accompanying drawings.
However, the present disclosure is not limited herein.
[0057] Terms such as grouting valve pipe body, movable piston,
grouting pipe and air injection pipe are repeatedly used herein
without excluding the possibility of using other terms. These terms
are merely used to describe and explain the essence of the present
disclosure more conveniently, and it is contrary to the spirit of
the present disclosure to interpret these terms as any additional
limitation.
[0058] It is further to be noted that the specific examples
described herein are merely illustrative of the spirit of the
present disclosure. Persons skilled in the art may make various
modifications or supplementations or substitutions in a similar
manner to the described specific examples without departing from
the spirit of the present disclosure or surpassing the scope
defined in the appended claims.
* * * * *