CN114541442B - Installation method of lock catch steel pipe or steel sheet pile cofferdam inner support - Google Patents
Installation method of lock catch steel pipe or steel sheet pile cofferdam inner support Download PDFInfo
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- CN114541442B CN114541442B CN202210337795.XA CN202210337795A CN114541442B CN 114541442 B CN114541442 B CN 114541442B CN 202210337795 A CN202210337795 A CN 202210337795A CN 114541442 B CN114541442 B CN 114541442B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 127
- 239000010959 steel Substances 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000009434 installation Methods 0.000 title claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 28
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000003466 welding Methods 0.000 claims description 9
- 238000011065 in-situ storage Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 229910001204 A36 steel Inorganic materials 0.000 claims 1
- 239000010410 layer Substances 0.000 description 129
- 238000013461 design Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a method for installing a lock catch steel pipe or steel sheet pile cofferdam inner support, which comprises the steps of manufacturing an upper inner support and a lower inner support; assembling a lower layer inner support and a protective guard, installing a lower layer hanging and limiting system, and integrally lowering the lower layer inner support; assembling an upper layer inner support and a protective guard, installing an upper layer hanging and limiting system, and integrally lowering the upper layer inner support; the upper layer and the lower layer are internally supported and reinforced, and the upper layer and the lower layer are hung and the limiting system is removed. The two-layer internal support adopts factory production and pre-splicing, the precision is high, the bracket strength and the rigidity are high, the lifting lug on the steel pile casing is connected through the pin shaft, the installation and the dismantling times are few, the construction is convenient, the internal support is assembled on the bracket, the quality is controllable, the two crawler cranes are adopted to integrally descend layer by layer, the temporary hanging and limiting system is used for fixing, the construction is convenient, the safety risk is reduced, the internal support is also used as a lock catch steel pipe or a steel sheet pile to insert and drive a positioning guide beam, the temporary guide beam investment is reduced, the construction safety and quality are easier to control, and the construction period is shortened.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a method for installing a lock catch steel pipe or steel sheet pile cofferdam inner support.
Background
With the rapid development of the economy and society in China, the construction scale of the infrastructure is continuously increased, the bridge construction is daily and monthly, and the underwater foundation is countless. The locking steel pipe or steel sheet pile cofferdam consists of the locking steel pipe or steel sheet pile and an inner support, and can effectively prevent water and soil from entering the building construction position. The locking steel pipe or the steel sheet pile cofferdam has high strength, is easy to drive into a hard soil layer, can be constructed in deep water, has low material consumption and high recovery rate, and is quick to construct. In general, the application of the underwater bearing platform is extremely wide in construction.
When the inner support of the cofferdam with the locking steel pipes or the steel sheet piles is constructed by adopting a conventional method, a temporary positioning guide beam is generally installed first, the locking steel pipes or the steel sheet piles are inserted and driven, and the inner support is installed when water is pumped behind the bottom sealing of the cofferdam. The construction by adopting the conventional method has the following defects:
1. before the lock catch steel pipe or the steel sheet pile is inserted and driven, the temporary positioning guide beam and the protective railing on water are required to be installed, the positioning effect of the single-layer guide beam is poor, the insertion and driving precision of the lock catch steel pipe or the steel sheet pile is difficult to control, the material input amount is large, and after the inner support is installed, the temporary positioning guide beam and the protective railing are required to be removed;
2. as water is pumped in the cofferdam, the difference between the internal water head and the external water head is increased, at the moment, the internal support is not installed yet and cannot participate in stress, so that the water pressure born by the lock catch steel pipe or the steel sheet pile is gradually increased, the deformation is increased, the water leakage at the lock catch is increased, and the cofferdam is difficult to leak;
3. when the cofferdam pumps water to about 1m below the bottom of the upper and lower internal supports, the water pumping is stopped, the upper and lower internal supports are arranged layer by layer, and more personnel construction channels are needed to be added due to the operation in the cofferdam;
4. the inner support adopts a mounting sequence from top to bottom, when the inner support is mounted, most rod pieces are influenced by the upper positioning guide beams or the mounted inner support, and cannot be directly hoisted to a design position by utilizing a crane, and the inner support is assisted in position by adopting measures such as manpower or a hoist; meanwhile, the steel pile is influenced by the steel pile casing and the locking steel pipe or the steel sheet pile, the operation space is narrow, and part of the locking has water leakage phenomenon, so that the inner support is required to be manufactured into small sections when being manufactured in a factory for safe and smooth installation, and the inner support is installed by adopting a crane section by section in a scattered manner on site;
5. when a hoisting machine driver works, the blind area is large, the hoisting times are large, and the hoisting difficulty is high; the inner support installer has difficult operation, high safety risk, low construction speed and difficult control of construction quality.
Disclosure of Invention
The invention aims to provide a method for installing the lock catch steel pipe or steel sheet pile cofferdam inner support, which is convenient and quick to construct, small in construction investment, small in safety risk and controllable in quality.
The purpose of the invention is realized in the following way:
the installation method of the lock catch steel pipe or steel sheet pile cofferdam internal support is characterized by comprising the following steps: the method comprises the following steps:
A. manufacturing an upper inner support and a lower inner support in a sectional manner;
B. assembling a lower layer inner support, installing a lower layer protective railing, installing a lower layer hanging and limiting system, and integrally lowering the lower layer inner support; wherein: the lower layer hanging and limiting system comprises a lower layer hanging steel wire rope, and a lower layer transverse limiting and a vertical limiting;
C. assembling an upper layer inner support, installing an upper layer protective railing, installing an upper layer hanging and limiting system, and integrally lowering the upper layer inner support; wherein: the upper layer hanging and limiting system comprises an upper layer hanging steel wire rope, an upper layer transverse limit, a vertical limit and an oblique limit;
D. and reinforcing the lower layer inner support and the upper layer inner support, and dismantling the lower layer hanging steel wire rope, the lower layer transverse limit, the upper layer hanging steel wire rope, the upper layer transverse limit, the vertical limit and the oblique limit to finish construction.
In the step A, when the upper layer support and the lower layer support are manufactured in a segmented mode, the upper layer support and the lower layer support are manufactured into large segments as far as possible on the premise of meeting hoisting and transportation, and meanwhile, an upper layer hanging lifting lug, an upper layer integrally-descending lifting lug, a lower layer hanging lifting lug and a lower layer integrally-descending lifting lug are welded on the upper layer support and the lower layer support.
In step B, assemble lower floor in situ support, install lower floor protection railing, install lower floor and hang and spacing system, whole lower floor in situ support specifically includes:
a. welding an upper dual-purpose lifting lug and a lower dual-purpose lifting lug on the steel casing, wherein the upper dual-purpose lifting lug is provided with two preformed holes, the upper preformed holes are used for installing inner support assembly brackets, and the lower preformed holes are used for hanging the inner support of the upper layer; two preformed holes are arranged on the lower dual-purpose lifting lug, the upper preformed hole is used for installing the inner support assembly bracket, and the lower preformed hole is used for hanging the inner support of the lower layer. The inner support assembly bracket is hinged with the upper dual-purpose lifting lug and the lower dual-purpose lifting lug by adopting a pin shaft; welding is adopted among the sections supported in the lower layer, and the lower layer protection railing is welded on the top of the lower layer support by adopting phi 36 steel pipes;
b. welding a lower-layer transverse limit of HW300 multiplied by 300 on the side surface supported in the lower layer, wherein the distance between the lower-layer transverse limit and the steel casing is 3cm;
c. the side surface of the lower layer support is welded with the lower end of the vertical limit made of HW 440X 300 section steel, the bottom elevation of the vertical limit is consistent with the bottom elevation of the lower layer support, and the top elevation of the vertical limit is consistent with the top elevation of the upper layer support;
d. one end of the lower layer hanging steel wire rope is connected with a lower dual-purpose lifting lug on the steel casing through a pin shaft, and the other end of the lower layer hanging steel wire rope is connected with a lower layer hanging lifting lug on the lower layer inner support through a shackle;
e. and simultaneously lifting the lower internal support by using two crawler cranes, dismantling the internal support and assembling bracket, and integrally lowering to the design elevation.
In step C, assemble upper strata in situ support, install upper protective railing, install upper strata and hang and spacing system, wholly put down upper strata in situ support specifically includes:
a. the inner support assembly bracket is installed by adopting the same method, the upper layer inner support is assembled, the upper layer hanging steel wire rope is installed to transversely limit with the upper layer, the upper layer inner support is integrally lifted, the inner support assembly bracket is removed, and the whole upper layer hanging steel wire rope is lowered to the designed elevation;
b. the side surface of the upper layer inner support is welded with the upper end of the vertical limit of HW440 multiplied by 300, namely the vertical limit is used for connecting the lower layer inner support and the upper layer inner support;
c. the oblique limit of HW 300X 300 is welded with the top and the steel casing of the upper layer.
In the step D, the upper layer inner support and the lower layer inner support are reinforced, and the dismantling of the upper layer hanging and limiting system and the lower layer hanging and limiting system specifically includes:
a. the upper inner support and the lower inner support are used as positioning guide beams, lock catch steel pipes or steel sheet piles are inserted and beaten, and the cofferdam is used for sealing the bottom and pumping water;
b. checking the close contact condition of the upper inner support, the lower inner support and the inner wall of the lock catch steel pipe or the steel sheet pile, compacting and welding and fixing the part with the gap by adopting a small steel member shoveling pad;
c. the bottoms of the upper layer support and the lower layer support are respectively provided with an upper layer support bracket and a lower layer support bracket, the upper layer support bracket and the lower layer support bracket are respectively welded firmly with the inner wall of the lock catch steel pipe or the steel sheet pile, and the upper layer hanging and limiting system and the lower layer hanging and limiting system are removed.
The invention adopts the sectional manufacturing of the inner support; assembling a lower layer inner support, installing a lower layer protective railing, installing a lower layer hanging and limiting system, and integrally lowering the lower layer inner support; assembling an upper layer inner support, installing an upper layer protective railing, installing an upper layer hanging and limiting system, and integrally lowering the upper layer inner support; and the two layers of the inner supports are reinforced, and the two layers of the hanging and limiting systems are removed.
The inner support is manufactured in a factory with large sections, the factory is pre-spliced, the machining precision is high, the strength and the rigidity of the bracket assembled by the inner support are high, the lifting lug on the steel pile casing is connected by a pin shaft, the installation and the dismantling times are few, the construction is convenient and quick, the assembling speed of the two inner supports on the bracket is high, the quality is controllable, the two inner supports are integrally lowered layer by adopting the two crawler cranes, the inner operation time of the cofferdam is shortened, the temporary hanging and limiting systems are utilized for fixing, the construction is convenient and quick, the construction safety risk is reduced, the two inner supports are also used as inserted positioning guide beams of the lock catch steel pipes or the steel sheet piles, compared with the traditional construction method of the prior lock catch steel pipes or the steel sheet piles, the investment of the temporary guide beams is reduced, the construction safety and the quality are easier to control, and the integral construction period is shortened.
Therefore, compared with the prior art, the invention has the advantages that:
(1) The lock catch steel pipe or the steel sheet pile is inserted and beaten by using the upper and lower inner supports as positioning guide beams, so that the material investment is less, and the insertion and beaten precision of the lock catch steel pipe or the steel sheet pile is easier to control;
(2) When the cofferdam is pumped, the locking steel pipes or the steel sheet piles transmit water pressure to the two-layer inner support, so that the deformation of the locking steel pipes or the steel sheet piles is small, and the cofferdam has better waterproof effect;
(3) The assembly of the two inner supports is carried out on the water surface, the operation space is not limited, the two inner supports can be processed into large sections when manufactured in factories, the on-site assembly is convenient and quick, the safety risk is small, and the quality is controllable;
(4) After the inner supports in the two layers are assembled on the inner support assembly bracket, the two crawler cranes are adopted to integrally hoist and lower the bracket to the designed elevation, the hanging and limiting system is adopted to temporarily fix the bracket, after the locking steel pipe or the steel sheet pile is inserted and driven, the cofferdam is sealed, and the water is pumped, the inner supports are inspected and fixed, and the upper hanging and limiting system and the lower hanging and limiting system can be removed, so that the mechanical operation time, the cofferdam inner operation time and the integral construction period are effectively shortened.
The invention is more suitable for the construction requirement of supporting and installing in the underwater bearing platform lock catch steel pipe or steel sheet pile cofferdam.
Drawings
FIG. 1 is a plan view of a lifting lug in an embodiment of the invention;
FIG. 2 is a schematic view of an inner support assembly bracket in an embodiment of the present invention;
FIG. 3 is a view showing the floor plan of the assembled inner support and the installed guard rail according to the embodiment of the present invention;
FIG. 4 is a top view of an internal support stop and splice Niu Tuiping in an embodiment of the present invention;
FIG. 5 is a schematic view showing the overall lower elevation of the lower layer support according to the embodiment of the present invention;
FIG. 6 is a schematic view showing the overall lower elevation of the upper inner support in an embodiment of the present invention;
FIG. 7 is a top plan view of an embodiment of the present invention with the inner support installed;
in the figure: the lifting lug is hung on the 1-lower layer, the lifting lug is hung on the 2-upper layer, the lifting lug is integrally hung on the 3-lower layer, the lifting lug is integrally hung on the 4-upper layer, the lifting lug is hung on the 5-upper dual-purpose lifting lug, the lifting lug is hung on the 6-lower dual-purpose lifting lug, the 7-steel protective cylinder, the 8-lower layer internal support, the 9-upper layer internal support, the 10-trestle, the 11-internal support assembly bracket, the 12-crawler crane, the 13-lower layer protection railing, the 14-oblique limit, the 15-vertical limit, the 16-lower layer transverse limit, the 17-upper layer transverse limit, the 18-lower layer hanging steel wire rope, the 19-integrally hung steel wire rope, the 20-upper layer hanging steel wire rope, the 21-upper layer protection railing, the 22-locking steel tube or steel sheet pile, the 23-back cover concrete, the 24-lower layer support bracket and the 25-upper layer support bracket.
Detailed Description
The invention will be described in further detail below with reference to examples of embodiments and with reference to the accompanying drawings.
The embodiment of the invention provides a method for installing a lock catch steel pipe or steel sheet pile cofferdam inner support, which comprises the following steps:
A. before the construction of the lock catch steel pipe or steel sheet pile cofferdam inner support is implemented, a drilling platform is dismantled, trestle 10 on two sides is reserved as an operation platform, a steel pile casing 7 is cut to uniform elevation, and the steel pile casing is used as a base of a bottom sealing platform;
B. on the premise of ensuring hoisting and transportation, the lower inner support 8 and the upper inner support 9 are reasonably divided into a plurality of large sections, so that the field work load is reduced, when in-factory processing, matching processing is carried out between the sections, pre-assembly is carried out in the process, the matching precision is strictly controlled, and the in-field assembly of the inner support is ensured to meet the construction requirement; as shown in fig. 2, a lower layer hanging lifting lug 1 and a lower layer integral lower lifting lug 3 are welded on the top surface of a lower layer support 8, an upper layer hanging lifting lug 2 and an upper layer integral lower lifting lug 4 are welded on the top surface of an upper layer support 9, an upper dual-purpose lifting lug 5, a lower dual-purpose lifting lug 6, a lower layer transverse limit 16, an upper layer transverse limit 17, an oblique limit 14 and a vertical limit 15 are processed in a factory, and after the processing is finished, the lower layer hanging lifting lug, the lower dual-purpose lifting lug, the upper layer transverse limit 17, the oblique limit 14 and the vertical limit 15 are transported to a construction site by using a transport vehicle;
C. the installation steps of the upper layer internal support 8 and the lower layer internal support 9 performed on the construction site comprise the following steps:
a. assemble lower floor's internal support 8, install lower floor's protection railing 13, install lower floor and hang and spacing system, whole lower floor's internal support 8:
an upper dual-purpose lifting lug 5 and a lower dual-purpose lifting lug 6 are welded on the steel casing 7, wherein two preformed holes are formed in the upper dual-purpose lifting lug, one preformed hole is used for installing an inner support assembly bracket, and the other preformed hole is used for hanging an upper inner support; two preformed holes are arranged on the lower dual-purpose lifting lug, one preformed hole is used for installing the inner support assembly bracket, and the other preformed hole is used for hanging the inner support of the lower layer. The inner support assembly bracket 11 is hinged with the upper reserved holes of the upper dual-purpose lifting lug 5 and the lower dual-purpose lifting lug 6 by adopting pin shafts, after the inner support assembly bracket 11 is installed, the side line of the lower inner support 8 is measured, and the crawler crane 12 is utilized to hoist each section of the lower inner support 8 onto the inner support assembly bracket 11 for assembly and welding, and meanwhile, the lower protective railing 13 is installed;
a lower layer transverse limit 16 made of profile steel is welded on the side surface of the lower layer inner support 8, and the distance between the lower layer transverse limit 16 and the steel casing 7 is 3cm;
as shown in fig. 4 and 5, the side surface of the lower inner support 8 is welded with the lower end of the vertical limit 15 made of the section steel;
one end of the lower layer hanging steel wire rope 18 is connected with a lower reserved hole of the lower dual-purpose lifting lug 6 by adopting a pin shaft, and the other end of the lower layer hanging steel wire rope 18 is connected with the lower layer hanging lifting lug 1 on the lower layer inner support 8 by adopting a shackle;
as shown in fig. 6, the whole lowering wire rope 19 is connected with the lower layer whole lowering hanging lug 3 by adopting a shackle, the lower layer inner support 8 is lifted by utilizing the two crawler cranes 12 at the same time, the inner support assembly bracket 11 is removed, and the whole is lowered to the design elevation;
b. assemble upper strata in situ support 9, install upper strata protection railing 21, install upper strata and hang and spacing system, wholly put upper strata in situ support 9:
the inner support assembly bracket 11 is installed by adopting the same method, the upper inner support 9 is assembled, the upper hanging steel wire rope 20 and the upper transverse limit 17 are installed, the upper inner support 9 is integrally lifted, the inner support assembly bracket 11 is removed, and the whole body is lowered to the design elevation;
as shown in fig. 4 and 6, the side surface of the upper inner support 9 is welded with the upper end of the vertical limit 15;
as shown in fig. 4 and 6, the oblique limiting parts 14 made of the section steel are respectively welded with the top of the upper inner support 9 and the steel pile casing 7;
c. the lower layer inner support 8 and the upper layer inner support 9 are reinforced, and the upper layer hanging and limiting system and the lower layer hanging and limiting system are removed:
the lower inner support 8 and the upper inner support 9 are used as positioning guide beams, lock catch steel pipes or steel sheet piles 22 are inserted and driven, the cofferdam is filled with underwater bottom sealing concrete 23, and cofferdam water pumping is carried out after the bottom sealing concrete 23 reaches the design strength;
checking the close adhesion condition of the lower inner support 8 and the upper inner support 9 with the inner wall of the lock catch steel pipe or the steel sheet pile 15, compacting and welding the parts with gaps by adopting small steel members to form pads;
the bottoms of the lower layer support 8 and the upper layer support 9 are respectively provided with a lower layer support bracket 24 and an upper layer support bracket 25, the lower layer support bracket 24 and the upper layer support bracket 25 are firmly welded with the inner wall of the lock catch steel pipe or the steel sheet pile 22, and the hanging and limiting system is removed to finish construction.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (3)
1. The installation method of the lock catch steel pipe or steel sheet pile cofferdam inner support is characterized by comprising the following steps of: the method comprises the following steps:
A. manufacturing an upper inner support and a lower inner support in a sectional manner;
B. assemble lower floor's internal stay, install lower floor's protection railing, install lower floor and hang and limit system, whole lower floor's internal stay specifically includes:
a. welding an upper dual-purpose lifting lug and a lower dual-purpose lifting lug on the steel casing, wherein the upper dual-purpose lifting lug is provided with two preformed holes, the upper preformed holes are used for installing inner support assembly brackets, and the lower preformed holes are used for hanging the inner support of the upper layer; two preformed holes are arranged on the lower dual-purpose lifting lug, the upper preformed hole is used for installing the inner support assembly bracket, and the lower preformed hole is used for hanging the inner support of the lower layer; the inner support assembly bracket is hinged with the upper dual-purpose lifting lug and the lower dual-purpose lifting lug by adopting a pin shaft; the lower protection railing is welded on the top of the lower support by adopting an A36 steel pipe;
b. welding a lower-layer transverse limit of HW300 multiplied by 300 on the side surface supported in the lower layer, wherein the distance between the lower-layer transverse limit and the steel casing is 3cm;
c. the side surface of the lower layer support is welded with the lower end of the vertical limit made of HW 440X 300 section steel, the bottom elevation of the vertical limit is consistent with the bottom elevation of the lower layer support, and the top elevation of the vertical limit is consistent with the top elevation of the upper layer support;
d. one end of the lower layer hanging steel wire rope is connected with a lower dual-purpose lifting lug on the steel casing through a pin shaft, and the other end of the lower layer hanging steel wire rope is connected with a lower layer hanging lifting lug on the lower layer inner support through a shackle;
e. simultaneously hoisting the lower inner support by using two crawler cranes, dismantling the inner support assembly bracket, and integrally lowering to the designed elevation;
wherein: the lower layer hanging and limiting system comprises a lower layer hanging steel wire rope, and a lower layer transverse limiting and a vertical limiting;
C. assemble upper strata in situ support, install upper protective railing, install upper strata and hang and limit system, wholly put upper strata in situ support down, specifically include:
a. the inner support assembly bracket is installed by adopting the same method, the upper layer inner support is assembled, the upper layer hanging steel wire rope is installed to transversely limit with the upper layer, the upper layer inner support is integrally lifted, the inner support assembly bracket is removed, and the whole upper layer hanging steel wire rope is lowered to the designed elevation;
b. the side surface of the upper layer inner support is welded with the upper end of the vertical limit of HW440 multiplied by 300, namely the vertical limit is used for connecting the lower layer inner support and the upper layer inner support;
c. the oblique limit of HW300 multiplied by 300 is respectively welded with the top and the steel casing supported in the upper layer;
wherein: the upper layer hanging and limiting system comprises an upper layer hanging steel wire rope, an upper layer transverse limit, a vertical limit and an oblique limit;
D. and reinforcing the lower layer inner support and the upper layer inner support, and dismantling the lower layer hanging steel wire rope, the lower layer transverse limit, the upper layer hanging steel wire rope, the upper layer transverse limit, the vertical limit and the oblique limit to finish construction.
2. A method of installing a lock catch steel pipe or steel sheet pile cofferdam in accordance with claim 1, wherein: in the step A, when the inner support is manufactured in a segmented mode, the inner support is manufactured into a large segment as much as possible on the premise of meeting hoisting and transportation, and meanwhile, the inner support is welded on the inner support to integrally lower the lifting lug and the hanging lifting lug.
3. A method of installing a lock catch steel pipe or steel sheet pile cofferdam in accordance with claim 1, wherein: in the step D, the upper layer inner support and the lower layer inner support are reinforced, and the dismantling of the upper layer hanging and limiting system and the lower layer hanging and limiting system specifically includes:
a. the upper inner support and the lower inner support are used as positioning guide beams, lock catch steel pipes or steel sheet piles are inserted and beaten, and the cofferdam is used for sealing the bottom and pumping water;
b. checking the close contact condition of the upper inner support, the lower inner support and the inner wall of the lock catch steel pipe or the steel sheet pile, compacting and welding and fixing the part with the gap by adopting a small steel member shoveling pad;
c. the bottoms of the upper layer support and the lower layer support are respectively provided with an upper layer support bracket and a lower layer support bracket, the upper layer support bracket and the lower layer support bracket are respectively welded firmly with the inner wall of the lock catch steel pipe or the steel sheet pile, and the upper layer hanging and limiting system and the lower layer hanging and limiting system are removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210337795.XA CN114541442B (en) | 2022-04-01 | 2022-04-01 | Installation method of lock catch steel pipe or steel sheet pile cofferdam inner support |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210337795.XA CN114541442B (en) | 2022-04-01 | 2022-04-01 | Installation method of lock catch steel pipe or steel sheet pile cofferdam inner support |
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| CN114541442A CN114541442A (en) | 2022-05-27 |
| CN114541442B true CN114541442B (en) | 2023-12-22 |
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| CN110359476A (en) * | 2019-07-04 | 2019-10-22 | 中铁七局集团有限公司 | A kind of construction method of steel sheet-pile cofferdam inner support and drilled pile steel pile casting installation operation platform |
| CN111980019A (en) * | 2020-08-21 | 2020-11-24 | 中铁四局集团有限公司 | Construction method of steel pipe pile cofferdam for locking notch of main bridge bearing platform of super-large bridge |
| CN112459090A (en) * | 2020-11-11 | 2021-03-09 | 江苏玖沐精工装备科技有限公司 | Novel steel hanging box cofferdam construction method based on Larsen steel sheet pile |
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2022
- 2022-04-01 CN CN202210337795.XA patent/CN114541442B/en active Active
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| JP2008297749A (en) * | 2007-05-30 | 2008-12-11 | Zenitaka Corp | Cofferdam construction method, cut-off structure, and cofferdam structure |
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| CN110359476A (en) * | 2019-07-04 | 2019-10-22 | 中铁七局集团有限公司 | A kind of construction method of steel sheet-pile cofferdam inner support and drilled pile steel pile casting installation operation platform |
| CN111980019A (en) * | 2020-08-21 | 2020-11-24 | 中铁四局集团有限公司 | Construction method of steel pipe pile cofferdam for locking notch of main bridge bearing platform of super-large bridge |
| CN112459090A (en) * | 2020-11-11 | 2021-03-09 | 江苏玖沐精工装备科技有限公司 | Novel steel hanging box cofferdam construction method based on Larsen steel sheet pile |
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