U.S. patent application number 17/401359 was filed with the patent office on 2022-04-14 for construction device and method for lateral bracing in ultra-deep foundation pit with silt.
The applicant listed for this patent is CHINA CONSTRUCTION THIRD BUREAU FIRST ENGINEERING CO., LTD.. Invention is credited to CANG CHEN, YUNFENG CHEN, HUAMIN CHENG, BO GAO, ZHENGHONG HUANG, SHIJIE LIU, YECUN QIAN, XIAOJUN ZHANG.
Application Number | 20220112676 17/401359 |
Document ID | / |
Family ID | |
Filed Date | 2022-04-14 |
![](/patent/app/20220112676/US20220112676A1-20220414-D00000.png)
![](/patent/app/20220112676/US20220112676A1-20220414-D00001.png)
![](/patent/app/20220112676/US20220112676A1-20220414-D00002.png)
![](/patent/app/20220112676/US20220112676A1-20220414-D00003.png)
![](/patent/app/20220112676/US20220112676A1-20220414-D00004.png)
![](/patent/app/20220112676/US20220112676A1-20220414-D00005.png)
![](/patent/app/20220112676/US20220112676A1-20220414-D00006.png)
![](/patent/app/20220112676/US20220112676A1-20220414-D00007.png)
United States Patent
Application |
20220112676 |
Kind Code |
A1 |
HUANG; ZHENGHONG ; et
al. |
April 14, 2022 |
CONSTRUCTION DEVICE AND METHOD FOR LATERAL BRACING IN ULTRA-DEEP
FOUNDATION PIT WITH SILT
Abstract
A construction device and method for a lateral bracing in an
ultra-deep foundation pit with silt includes a first-layer lateral
bracing member, a plurality of suspension rope systems and
construction operation plates. The first-layer lateral bracing
member is connected with the enclosing structure of the foundation
pit. The suspension rope systems include saddles, slings and
joists. The saddles are connected with the first-layer lateral
bracing member, and the construction operation plates are connected
with the joists.
Inventors: |
HUANG; ZHENGHONG; (WUHAN,
CN) ; GAO; BO; (WUHAN, CN) ; ZHANG;
XIAOJUN; (WUHAN, CN) ; QIAN; YECUN; (WUHAN,
CN) ; CHEN; YUNFENG; (WUHAN, CN) ; LIU;
SHIJIE; (WUHAN, CN) ; CHEN; CANG; (WUHAN,
CN) ; CHENG; HUAMIN; (WUHAN, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHINA CONSTRUCTION THIRD BUREAU FIRST ENGINEERING CO.,
LTD. |
WUHAN |
|
CN |
|
|
Appl. No.: |
17/401359 |
Filed: |
August 13, 2021 |
International
Class: |
E02D 17/04 20060101
E02D017/04 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 14, 2020 |
CN |
2020110986807 |
Claims
1-8. (canceled)
9. A construction method for a lateral bracing in an ultra-deep
foundation pit with silt comprising steps of: Step 1: constructing
the enclosing structure in the foundation pit and the first-layer
lateral bracing member; Step 2: determining numbers and positions
of the plurality of saddles according to a length of the
first-layer lateral bracing member, and fixing the plurality of
saddles to the first-layer lateral bracing member; Step 3:
providing diagonal bracings and determining positions of the
diagonal bracings and length of the slings according to height of a
to-be-constructed lateral bracing, and mounting the diagonal
bracings on the enclosing structure; providing the construction
operation plates with a length according to a length of the
to-be-constructed lateral bracing, connecting the construction
operation plates with the enclosing structure through the diagonal
bracings, mounting the joists on the construction operation plates,
and connecting the saddles and the joists through the slings; Step
4: arranging reinforcements of the to-be-constructed lateral
bracing on the construction operation plates, and binding the
reinforcements to form reinforcement cages of the to-be-constructed
lateral bracing; mounting side formworks on all side ends of the
reinforcement cages to form a pouring cavity of the
to-be-constructed lateral bracing; pouring concrete in the pouring
cavity and removing the side formworks after thea strength of the
concrete reaches the a standard or meets a design requirement, and
thus, the construction of the lateral bracing on this layer is
completed; Step 5: repeating step 3 and step 4 to achieve
construction of a lateral bracing on the next layer.
10. The construction method for the lateral bracing in the
ultra-deep foundation pit with silt according to claim 9, wherein
the connection between the slings and the joists is provided with
length regulating members and lengthening members, the height and
levelness of the construction operation plates are regulated by the
regulating members or the lengthening members.
11-12. (canceled)
13. The construction method for the lateral bracing in the
ultra-deep foundation pit with silt according to claim 9, wherein a
connecting seam of the two adjacent construction operation plates
is located at the upper end of the same joist.
14. The construction method for the lateral bracing in the
ultra-deep foundation pit with silt according to claim 9, wherein
the first-layer lateral bracing member comprising a reinforcement
cage, angle steels and a concrete layer; the angle steels are
connected with two sides of the enclosing structure; the
reinforcement cage are connected with the angle steels; and the
reinforcement cages are filled with the concrete layer.
15. The construction method for the lateral bracing in the
ultra-deep foundation pit with silt according to claim 10, wherein
the suspension rope systems further comprise upper fixing members
and lower fixing members; the upper fixing members are connected
with the saddles; the lower fixing members are connected with the
joists; upper ends of the slings are directly connected with the
upper fixing members, or the upper ends of the slings are connected
with the upper fixing members by the length regulating members;
lower ends of the slings are connected with the lower fixing
members by the length regulating members, or the lower ends of the
slings are directly connected with the lower fixing members.
Description
FIELD
[0001] The present disclosure relates to buildings, in particular
to a construction device and method for a lateral bracing in an
ultra-deep foundation pit with silt.
BACKGROUND
[0002] With the increasing construction of urban infrastructure, it
has been developed towards "deep underground", particularly, in
coastal cities under high-speed development. A foundation pit
serves as a connecting channel for ground and underground
construction processes, and its deformation and stability directly
affect the safety of the foundation pit and underground
construction, and the construction quality of a lateral bracing in
the foundation pit directly affects the deformation and the
stability during excavation of the foundation pit and after the
excavation of the foundation pit is completed. The construction of
a traditional reinforced concrete lateral bracing generally
includes first pretreating the ground under a to-be-constructed
lateral bracing; then, pouring an under layer; and finally, binding
reinforcements, building a mold and pouring concrete. This
construction process is suitable for a foundation pit in which the
soil body bearing capacity is relatively high, or the soil body
bearing capacity is not high enough, but a soil body may be treated
by adopting relevant reinforcement measures. However, the
construction process is not suitable for an ultra-deep foundation
pit with a relatively thick silt layer in a coastal zone.
BRIEF DESCRIPTION OF THE DRAWINGS
[0003] FIG. 1 is a schematic diagram showing a structure of a
construction device for a lateral bracing in an ultra-deep
foundation pit with silt according to the present disclosure.
[0004] FIG. 2 is a schematic right view showing the structure in
FIG. 1.
[0005] FIG. 3 is a schematic top view showing the structure in Fig,
I.
[0006] FIG. 4 is a schematic perspective view showing a structure
of a suspension rope system in FIG.
[0007] FIG. 5 is a schematic partial lateral-sectional view showing
a structure of a length regulating member in FIG. 4.
[0008] FIG. 6 is a schematic bottom view showing a structure where
construction operation plates are provided with stiffened plates in
FIG. 1.
[0009] FIG. 7 is a schematic enlarged view showing a structure that
two construction
[0010] operation plates are matched with a joist in FIG. 1.
[0011] FIG. 8 is a schematic top view showing a structure in FIG.
7.
[0012] FIG. 9 is a schematic partially-enlarged view showing a
structure at a diagonal bracing in FIG. 1.
[0013] FIG. 10 is a schematic diagram showing a structure that the
construction device in FIG. 1 performs construction of a lateral
bracing on the next layer.
DETAILED DESCRIPTION OF EMBODIMENTS
[0014] The present disclosure will be further described in detail
with reference to the accompanying drawings and specific
embodiments,
[0015] As shown in FIG. 1 to FIG. 10, a construction device for a
lateral bracing in an ultra-deep foundation pit with silt includes
a first-layer lateral bracing member 2, construction operation
plates 4 and a plurality of suspension rope systems 3. The
ultra-deep refers to a foundation pit of more than 15 meters deep
in present disclosure.
[0016] The first-layer lateral bracing member 2 is connected with
an enclosing structure 1 of the foundation pit. The plurality of
suspension rope systems 3 are arranged along a long axis direction
of the first-layer lateral bracing member 2.
[0017] Specifically, the enclosing structure 1 of the foundation
pit includes a firstly poured grouting pile or diaphragm wall 102
and a post poured capping beam 101. Of course, the enclosing
structure 1 may also be of other structures of the foundation
pit.
[0018] The first-layer lateral bracing member 2 in the present
embodiment includes a reinforcement cage 203, angle steels 201 and
concrete layer 202 filled in the reinforcement cage 203. The angle
steels 201 are connected with two sides of the enclosing structure
1. The reinforcement cages 203 are connected with the angle steels
201.
[0019] A first-layer lateral bracing system is formed by the
first-layer lateral bracing member 2, which may not only be used as
a first lateral bracing of the enclosing structure 1 in the
foundation pit, but also may be used for bearing a load applied by
the suspension rope systems 3 and the construction operation plates
4. And therefore, it is unnecessary to arrange a bearing device for
the suspension rope systems 3. The angle steels 201 may be used for
improving the bending resistance of the first-layer lateral bracing
system. The reinforcement cages 203 and the angle steels 201 are
welded connected, so that the integrality of the first-layer
lateral bracing member 2 is improved, and the bearing capacity of
the first-layer lateral bracing member 2 is improved.
[0020] Specific construction steps of the first-layer lateral
bracing member 2 in the present embodiment are that: a position of
the first-layer lateral bracing member 2 is determined, a soil body
in a foundation pit below the first-layer lateral bracing member 2
is pretreated, an under layer is constructed as required, and a
precamber is set. The angle steels 201 in the present embodiment
include upper angle steels 201 and lower angle steels 201. Firstly,
the lower angle steels 201 are set to be connected with the capping
beam 101. Then, the reinforcement cages 203 are assembled on the
lower angle steels 201. Next, the upper angle steels 201 are
arranged, and the upper angle steels 201, the lower angle steels
201 and the reinforcement cages 203 are connected. And after the
inspection is passed, concrete is poured to form the concrete layer
202. In the present embodiment, an arrangement direction of the
first-layer lateral bracing member 2 is parallel to an arrangement
direction of a lateral bracing in a foundation pit to be
constructed later. The first-layer lateral bracing member 2 may
also be of other bracing structures, but is not limited to the
lateral bracing in the foundation pit, and may also be other
lateral arms or trusses arranged above the foundation pit.
[0021] The suspension rope systems 3 include saddles 301, slings
303, joists 306, upper fixing members 302, lower fixing members 305
and length regulating members 304. The saddles 301 are connected
with the first-layer lateral bracing member 2. The joists 306 are
arranged below the saddles 301 at intervals. The joists 306 are
connected with the saddles 301 or the first-layer lateral bracing
member 2 by the slings 303.
[0022] Specifically, the upper fixing members 302 are connected
with the saddles 301. The lower fixing members 305 are connected
with the joists 306. Upper ends of the slings 303 are directly
connected with the upper fixing members 302, or the upper ends of
the slings 303 are connected with the upper fixing members 302 by
the length regulating members 304. Lower ends of the slings 303 are
connected with the lower fixing members 305 by the length
regulating members 304, or the lower ends of the slings 303 are
directly connected with the lower fixing members 305. In the
present embodiment, preferably, the upper ends of the slings 303
are directly connected with the upper fixing members 302, and the
lower ends of the slings 303 are connected with the lower fixing
members 305 by the length regulating members 304.
[0023] In the present embodiment, the length regulating members 304
are preferably threaded pipe fittings. The lower ends of the slings
303 and the lower fixing members 305 are provided with threaded
sections matched with the threaded pipe fittings. By using the
length regulating members 304, not only may the relative distances
between the saddles 301 and the joists 306 and the heights of the
joists 306 be regulated, but also a space may be provided for the
disassembly and assembly of the construction operation plates
4.
[0024] In the present embodiment, each of the suspension rope
systems 3 includes two lower fixing members 305 symmetrically
arranged at two sides of each of the joists 306; and at least one
of the lower fixing members 305 is detachably connected with the
joist 306 or the slings 303.
[0025] The number of the upper fixing members 302 corresponds to
that of the lower fixing members 305, and arrangement positions of
the upper fixing members 302 and the lower fixing members 305 are
symmetric. In the present embodiment, each of the suspension rope
systems 3 includes a saddle 301 and a joist 306 and further
includes two slings 303, an upper fixing member 302, a lower fixing
member 305 and a length regulating member 304.
[0026] As shown in FIG. 6, the construction operation plates 4 are
provided with stiffened plates 401. The construction operation
plates 4 are preferably steel plates, and the stiffened plates 401
and the construction operation plates 4 are welded to form a whole.
The stiffened plates 401 are welded and fixed in a grid shape to
lower surfaces of the construction operation plates 4.
[0027] As shown in FIG. 7 and FIG. 8, the construction operation
plates 4 are connected with the joists 306. There may be several
construction operation plates 4, however, for facilitating
disassembly and assembly, it is preferable to have a plurality of
the construction operation plates 4, and each of the construction
operation plates 4 is connected with at least two of the joists
306. In the present embodiment, preferably, a connecting seam of
the two adjacent construction operation plates 4 is located at the
upper end of the same joist 306. Specifically, two ends of each of
the construction operation plates 4 are respectively arranged on
the two adjacent joists 306 and are connected by connecting bolts
402, and each of the joists 306 is provided with end parts of the
two adjacent construction operation plates 4. As shown in FIG. 9,
the construction operation plates 4 located at the two outermost
ends are connected with the firstly poured grouting pile or
diaphragm wall 102, and in the present embodiment, diagonal
bracings 5 are arranged below end parts of the construction
operation plates 4 connected with the grouting pile or diaphragm
wall 102. In the present embodiment, the diagonal bracings 5 are
used for beating loads at the end parts of the construction
operation plates 4 and fixing the end parts of the construction
operation plates 4. Of course, the diagonal bracings 5 may also be
arranged at two ends of the first-layer lateral bracing member 2
and are connected with the joists 306. Or the diagonal bracings 5
may also be connected with the end parts of the joists 306 and the
lower ends of the construction operation plates 4 so as to improve
the stability of connections between the construction operation
plates 4 and the joists 306.
[0028] A construction method for a lateral bracing by using the
construction device for the lateral bracing in the ultra-deep
foundation pit with silt in the present embodiment includes the
following steps:
[0029] step 1: an enclosing structure 1 in a foundation pit and a
first-layer lateral bracing member 2 are constructed, wherein the
enclosing structure 1 includes a grouting pile or diaphragm wall
and a capping beam, and the first-layer lateral bracing member 2 is
formed by pouring concrete after binding reinforcement cages and
angle steels;
[0030] step 2. the number and positions of saddles 301 of
suspension rope systems are determined according to the length of
the first-layer lateral bracing member, and the plurality of
saddles 301 are uniformly fixed to the first-layer lateral bracing
member 2 at intervals; and then, an upper fixing member 302 is
mounted at each of two sides of each of the saddles 301;
[0031] step 3: positions of diagonal bracings 5 are determined
according to the height of a to-be-constructed lateral bracing, and
the diagonal bracings 5 are mounted on the enclosing structure; the
length of sling 303 is determined according to the position of the
to-be-constructed lateral bracing, upper ends of the slings 303 are
connected with the upper fixing members 302; the number and
positions of construction operation plates 4 and the length of each
of the construction operation plates 4 are determined according to
the number and positions of the saddles 301, all the construction
operation plates 4 are connected into a whole by virtue of joists
306 and connecting bolts 402, then, the construction operation
plates 4 connected into a whole are suspended and transferred to
the position of the to-be-constructed lateral bracing, and two ends
of the construction operation plates 4 connected into a whole are
enabled to be fixed together with the diagonal bracings 5, wherein
positions and number of the joists 306 correspond to those of the
saddles 301; a lower fixing member 305 is mounted at each of two
sides of each of the joists 306, length regulating members 304 are
mounted on the lower fixing members 305, and then, the length
regulating members 304 are connected with lower ends of the slings
303 in step 4; and trial hoisting is performed, and relevant
hoisting parameters are determined, wherein the hoisting parameters
include weight parameters of the to-be-constructed lateral
bracing;
[0032] step 4: after trial hoisting is completed, reinforcements of
the to-be-constructed lateral bracing are arranged on the
construction operation plates 4, and the reinforcements are bound
to form reinforcement cages of the to-be-constructed lateral
bracing; when the reinforcements of the to-be-constructed lateral
bracing are arranged on the construction operation plates 4, it is
possible to disassemble parts of length regulating members 304 and
lower fixing members 305 of the construction operation plates 4 so
as to put in the reinforcements of the to-be-constructed lateral
bracing, and after the reinforcements of the to-be-constructed
lateral bracing are put in, the disassembled length regulating
members 304 and lower fixing members 305 are connected; side
formworks are mounted on all side ends of the reinforcement cages
of to-be-constructed lateral bracing on the construction operation
plates 4 to form a pouring cavity of the to-be-constructed lateral
bracing; heights and levelness of the construction operation plates
4 are regulated by virtue of the height regulating members 304, and
a precamber is set, of course, the heights and levelness of the
construction operation plates 4 may also be regulated by
lengthening members, the lengthening members in the present
embodiment may be another sling or more other slings which may be
bolted, bound or welded; concrete is poured in the pouring cavity,
after the strength of the concrete reaches the standard or meets a
design requirement, the side formworks are removed, and concrete
curing is performed, and thus, the construction of the lateral
bracing on this layer is completed, as shown in FIG. 10; and the
lower fixing members 305, the construction operation plates 4 and
the joists 306 below the length regulating members 304 are removed
as a whole; and
[0033] step 5: after earth excavation of the foundation pit is
performed to reach a predetermined elevation of a to-be-constructed
lateral bracing on the next layer, step 3 and step 4 are repeated
to achieve the construction of the lateral bracing on the next
layer, wherein when the slings 303 are not long enough, lower ends
of the slings 303 are connected with another sling 303 or more
other slings 303 by the length regulating members 304; with the
excavation of the foundation pit, a distance from the
to-be-constructed lateral bracing to the first-layer lateral
bracing member 2 gradually becomes far, so that the lengths of the
slings 303 need to be increased constantly, the plurality of slings
303 may be spliced by virtue of the length regulating members 304
and/or lengthening members, and thus, the slings 303 and the upper
fixing members 302 on the upper ends of the slings 303 do not need
to be disassembled
[0034] The present disclosure has the beneficial effects that:
[0035] 1. by arranging the plurality of suspension rope systems on
the first-layer lateral bracing member and laying the construction
operation plates by virtue of the suspension rope systems, a safe,
open and comfortable construction operation surface is provided for
field construction personnel and supervisors; the construction
device is suitable for the construction of a lateral bracing in a
foundation pit which is large in excavation depth, low in silt
bearing capacity and large in silt thickness, is particularly
suitable for construction environments such as flow-plastic silt,
silt reinforcement measure difficulty, short construction period
and burdensome construction task; and compared with an existing
construction device for a lateral bracing, the construction device
effectively improves the construction quality of the lateral
bracing in the foundation pit, greatly shortens the construction
period and increases comprehensive benefits; and
[0036] 2. the suspension rope systems are detachably connected with
the construction operation plates, so that modular assembly and
disassembly are achieved, the precamber of the lateral bracing is
effectively controlled, the construction quality is improved, and
the construction speed of the lateral bracing is increased; and the
construction operation plates may be recycled, so that the
construction cost is reduced.
[0037] Compared with one existing construction method for a lateral
bracing in a foundation pit, the construction method provided by
the present disclosure effectively improves the construction
quality of the lateral bracing in the foundation pit, greatly
shortens the construction period and increases comprehensive
benefits. A safe, open and comfortable construction operation
surface may be provided for field construction personnel and
supervisors; and the construction method is suitable for the
construction of a lateral bracing in a foundation pit which is
large in excavation depth, low in silt bearing capacity and large
in silt thickness, and is particularly suitable for construction
environments such as flow-plastic silt, silt reinforcement measure
difficulty, short construction period and burdensome construction
task. A current construction method for a lateral bracing in an
ultra-deep foundation pit with silt generally includes that:
firstly, support frames/scaffolds are built layer by layer from top
to bottom to provide an operation surface for construction; then,
reinforcement cages of the lateral bracing are built; and finally,
base plates and side formworks for pouring are laid for concrete
pouring. After the construction is completed, the disassembly of
the support frames in the foundation pits needs a great deal of
manpower and seriously affects the construction period and the
construction efficiency. By using the method provided by the
present disclosure, not only is the provided construction operation
surface safe and open, but also the construction operation surface
and the base plates for pouring the reinforcement cages share the
construction operation plates, base plate laying and removing
processes in an existing method are omitted, and thus, the
construction efficiency is further increased.
* * * * *