CN113774936A - Floating transportation, positioning and sinking construction method for double-wall steel cofferdam with pile foundation firstly and cofferdam secondly - Google Patents
Floating transportation, positioning and sinking construction method for double-wall steel cofferdam with pile foundation firstly and cofferdam secondly Download PDFInfo
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- CN113774936A CN113774936A CN202111111642.5A CN202111111642A CN113774936A CN 113774936 A CN113774936 A CN 113774936A CN 202111111642 A CN202111111642 A CN 202111111642A CN 113774936 A CN113774936 A CN 113774936A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 135
- 239000010959 steel Substances 0.000 title claims abstract description 135
- 238000010276 construction Methods 0.000 title claims abstract description 67
- 238000007667 floating Methods 0.000 title claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
Abstract
The invention relates to the technical field of cofferdam construction, in particular to a floating transportation, positioning and sinking construction method of a double-wall steel cofferdam with a pile foundation firstly and a cofferdam secondly, which comprises the following steps: s1, building a construction steel trestle and a floating platform; assembling a bottom cofferdam on the floating platform; s2, injecting water into the buoyancy tank to enable the buoyancy tank to sink until the bottom cofferdam floats in the water; assembling other upper cofferdams on the bottom cofferdam section; s3, performing underwater cutting and positioning steel casing inserting-striking on the pile foundation steel casing at the pier position; s4, floating and transporting the assembled double-wall steel cofferdam to a pile foundation steel casing; s5, positioning, sinking and leveling the double-wall steel cofferdam; and S6, cleaning the foundation and sealing the bottom in the double-wall steel cofferdam, and constructing a bearing platform and a pier body. The construction method can realize the synchronous construction of the assembly of the double-wall steel cofferdam and the pile foundation, avoid the large occupation of the assembly of the cofferdam on the construction period, effectively shorten the construction period of the cofferdam and provide sufficient reserve of the construction period for the subsequent bearing platform, pier body and other constructions.
Description
Technical Field
The invention relates to the technical field of cofferdam construction, in particular to a floating transportation, positioning and sinking construction method of a double-wall steel cofferdam with a pile foundation firstly and a cofferdam secondly.
Background
The cofferdam is a temporary enclosure structure in the hydraulic engineering construction, such as box culvert construction, bridge bored pile construction and the like, and mainly has the main functions of stopping water sources and retaining soil, and the cofferdam is generally dismantled after use. The double-wall steel cofferdam is used as a new technology in bridge deepwater foundation construction, and has the characteristics of high strength, large rigidity and good waterproof performance, and the double-wall steel cofferdam is used as a water retaining and formwork structure for bearing platform construction, so that construction conditions are provided for the bearing platform construction through the whole day of the steel cofferdam and the bottom sealing concrete, the double-wall steel cofferdam is widely applied to the construction of a plurality of bridge deepwater foundations, and in recent years, the construction of highway and railway bridge deepwater foundations in China adopts the double-wall steel cofferdam as a temporary water retaining structure in a large scale.
Because the design and processing of the cofferdam are long in time consumption, the construction process of the pile foundation in the water bearing platform is usually carried out before the cofferdam. Under the condition that a large-scale floating crane is not available, the double-wall steel cofferdam is usually constructed by adopting a segmental and block in-situ splicing construction process. The existing in-situ splicing construction steps are as follows: dismantling the drilling platform, welding and assembling brackets on the steel casing, and integrally assembling bottom side plates on the assembled brackets; mounting a bottom layer inner support, connecting four angle steel protective cylinders of a high bearing platform and mounting hanging equipment; installing a guiding device below the cofferdam, and slowly lowering the steel cofferdam to a self-floating state by utilizing hanging equipment; the second layer of cofferdam and the corresponding inner support are scattered and spliced, the concrete of the blade foot and the wall cabin is poured, and water is injected for lowering; sequentially splicing subsequent side wall sections and inner supports in a scattered mode, injecting water, sucking mud, lowering and leveling, pouring bottom sealing concrete, after the bottom sealing concrete reaches the designed strength, pumping water to chisel a pile head, constructing a bearing platform and a pier body, and after the construction of the pier body is finished, returning water to remove the cofferdam.
By adopting the in-situ loose assembly construction process, after the drilling platform is dismantled, the bracket and the hanging system need to be assembled, and the side wall of the cofferdam needs to be assembled in sections and blocks, so that the process is complicated, the construction period is long, the resource investment is greatly increased, the construction cost is high, and the construction period of the subsequent bearing platform, pier body and superstructure is short.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a floating transportation, positioning and sinking construction method of a double-wall steel cofferdam with a pile foundation firstly and a cofferdam secondly, and aims to solve the problems that the construction period of a subsequent cushion cap, a pier body and an upper structure is short due to the facts that an in-situ loose assembly construction process is adopted, after a drilling platform is disassembled, a bracket and a hanging system need to be installed and assembled, and the side wall of the cofferdam needs to be assembled in sections and blocks, the process is complicated, the construction period is long, the resource investment is greatly increased, the construction cost is high, and the construction period of the subsequent cushion cap, the pier body and the upper structure is short.
In order to achieve the purpose, the invention provides the following technical scheme:
a floating transportation, positioning and sinking construction method for a double-wall steel cofferdam with a pile foundation firstly and a cofferdam secondly comprises the following steps:
s1, building a construction steel trestle, and assembling a square floating platform in water by adopting a floating box on one side of the construction steel trestle; assembling a bottom cofferdam on the floating platform by using a crane, and fixing a temporary steel support at the top corner of the bottom cofferdam;
s2, pouring water into the buoyancy tank to enable the buoyancy tank to sink until the bottom cofferdam floats in the water, and further enabling the bottom cofferdam to be separated from the floating platform; assembling other sections of cofferdams at the upper part on the bottom section of cofferdam to complete the integral assembly of the double-wall steel cofferdam, and installing an inner support in the double-wall steel cofferdam;
s3, completing pile foundation construction at the pier position, dismantling the drilling platform, and performing underwater cutting on the pile foundation steel casing, so that the top of the pile foundation steel casing is lower than the lower end of the bottom cofferdam;
s4, carrying the assembled double-wall steel cofferdam to a pier position by floating by using tugboats, and pouring wall cabin concrete;
s5, positioning and sinking the double-wall steel cofferdam by using the inner guide piece, the middle positioning plate and the upper fine adjustment device, sinking to a designed elevation and leveling;
and S6, cleaning the foundation in the double-wall steel cofferdam and sealing the bottom, draining the water in the double-wall steel cofferdam after the strength of the bottom sealing concrete meets the requirement, constructing a bearing platform and a pier body, and after the construction of the pier body is finished, returning water to dismantle the double-wall steel cofferdam.
Preferably, in step S1, the floating platform is fixed by a steel trestle connected by an iron chain, and a bottom platform is arranged on the floating platform by using sleepers or section steel and used for supporting the bottom cofferdam.
Preferably, in step S4, the layout of the tug is determined by calculation, and local reinforcement is performed on the cofferdam wall body according to the layout position of the tug and the position change during the floating transportation, and the tug pulling lug and the winch pulling and pulling point are welded.
Preferably, after the double-walled steel cofferdam is floated and transported in step S4, the buoyancy tank of the floating platform is inflated to press out the water inside the buoyancy tank and the floating platform floats on the water surface.
Preferably, in the step S3, the top of the pile foundation steel casing is 25-30cm lower than the lower end of the bottom section cofferdam in the floating transportation.
Preferably, in step S4, tires are hung on the side walls of the tug close to the double-wall steel cofferdam.
Preferably, in step S5, the inner guide is disposed on the inner wall of the double-wall steel cofferdam and corresponds to the pile foundation steel casing, the inner guide is an arc-shaped sheet metal part attached to the outer wall of the pile foundation steel casing, and a wedge-shaped block is disposed at the bottom of the inner guide.
Preferably, in the step S3, a plurality of positioning steel casing pipes are respectively arranged on two sides and downstream of the pile foundation steel casing pipe area; in the step S5, a positioning plate is fixed on the top of the downstream positioning steel pile casing, and an upper fine adjustment device is fixed on the tops of the two side positioning steel pile casings, wherein the upper fine adjustment device is a jack, and a guide plate is fixed on the telescopic end of the jack.
Compared with the prior art, the invention has the following beneficial effects:
firstly, assembling a floating platform, and assembling a bottom cofferdam on the floating platform; after the bottom cofferdams are assembled, the floating platform is sunk, and then the bottom cofferdams float automatically to realize separation of the bottom cofferdams and the floating platform; assembling other sections of cofferdams on the bottom section of cofferdam to complete the assembly of the whole double-wall steel cofferdam; the double-wall steel cofferdam is transported to a pier position by floating with the aid of a tug and sunk, the foundation is cleaned and the bottom is sealed, moisture is pumped out, then a bearing platform and a pier body can be constructed, and after the pier body construction is finished, the double-wall steel cofferdam is detached by returning water. In the whole process, the assembling bracket mounting and dismounting and the hanging system mounting are not required to be carried out on the pile foundation steel casing, so that the occupation of the two processes on the construction period is avoided; the construction method can realize the synchronous construction of the assembly of the double-wall steel cofferdam and the pile foundation, avoids the large occupation of the assembly of the cofferdam on the construction period, effectively shortens the construction period of the cofferdam and provides sufficient reserve of the construction period for the subsequent cushion cap, pier body and other constructions.
Drawings
FIG. 1 is a schematic diagram of splicing a floating platform and a bottom cofferdam according to the invention;
FIG. 2 is a cross-sectional view of the front view of FIG. 1;
FIG. 3 is a schematic diagram of the floating transportation of the double-wall steel cofferdam;
FIG. 4 is a schematic diagram of the double-wall steel cofferdam after floating to the pier position;
fig. 5 is a schematic view of pier body construction;
FIG. 6 is a schematic layout of a pile foundation steel casing and an inner guide member;
description of the reference numerals:
100. a steel trestle; 200. a floating platform; 300. bottom cofferdams; 301. temporary steel support; 302. an inner support; 400. a double-wall steel cofferdam; 500. pile foundation steel casing; 401. an inner guide; 402. a wedge block; 600. positioning a steel casing; 700. a jack; 701. a guide plate; 800. a middle positioning plate; 900. a tug; 1000. sealing bottom concrete; 1100. a bearing platform; 1200. a pier body.
Detailed Description
In the following, the technical solutions of the present invention will be described clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to the attached drawings 1-6, a double-wall steel cofferdam floating, positioning and sinking construction method of a pile foundation and a cofferdam comprises the following steps:
s1, building a construction steel trestle 100, and assembling a square floating platform 200 in water by adopting a floating box at one side of the construction steel trestle 100; assembling the bottom cofferdam 300 on the floating platform 200 by using a crane, fixing temporary steel supports 301 at the top corners of the bottom cofferdam 300, and shaping the bottom cofferdam 300 by the temporary steel supports 301 to prevent the bottom cofferdam 300 from deforming in the floating process; it should be noted here that the crane is disposed on the steel trestle 100; in addition, in this step, the floating platform 200 is fixed on the steel trestle 100 by using an iron chain, and a bottom platform 201 is arranged on the floating platform 200 by using sleepers or section steel and used for supporting the bottom cofferdam 300;
s2, injecting water into the buoyancy tank to enable the floating platform 200 to sink until the bottom cofferdam 300 floats in the water, and further enabling the bottom cofferdam 300 to be separated from the floating platform 200; assembling other upper cofferdams on the bottom cofferdam 300 and assembling other cofferdams on other sections to complete the integral assembly of the double-wall steel cofferdam 400, and installing the inner support 302 in the double-wall steel cofferdam 400; it should be added here that each section of the double-wall steel cofferdam 400 is a hollow structure, so that it will float when it sinks to a certain depth;
s3, completing pile foundation construction at the pier body 1200, and dismantling the drilling platform; and underwater cutting the pile foundation steel casing 500 to make the top of the pile foundation steel casing 500 lower than the lower end of the bottom cofferdam 300, preferably, the top of the pile foundation steel casing 500 is lower than the lower end of the bottom cofferdam 300 by 25-30cm during floating transportation;
s4, carrying the assembled double-wall steel cofferdam 400 to the pile foundation steel pile casing 500 by floating by using a tugboat 900, and pouring wall cabin concrete (namely pouring the concrete into the hollow structure of the double-wall steel cofferdam 400);
s5, sinking the double-wall steel cofferdam 400 to a designed elevation and leveling by using the inner guide part 401, the middle positioning plate 800 and the upper fine adjustment device; in this step, after the double-walled steel cofferdam 400 is floated and transported away, the buoyancy tank of the floating platform 200 is inflated to press out the water in the buoyancy tank and further enable the floating platform 200 to float out of the water, so that the reuse of the floating platform 200 can be realized; in addition, when the tug 900 is used for dragging and transporting the double-wall steel cofferdam 400, tires are hung on the side wall of the tug 900 close to the double-wall steel cofferdam 400 so as to protect the double-wall steel cofferdam 400; secondly, supplementary explanation is needed, before the tug 900 is used for floating, the floating route needs to be determined, the distribution position of the tug 900 is determined through calculation, and for the convenience of the tug 900 for floating the double-wall steel cofferdam 400, a dragging lifting lug (not shown in the drawing) is welded on the double-wall steel cofferdam 400, and reinforcement processing is carried out on the position where the dragging lifting lug is welded;
s6, cleaning foundation and sealing bottom in the double-wall steel cofferdam 400, after the strength of bottom sealing concrete 1000 meets the requirement, draining the water in the double-wall steel cofferdam 400, constructing a bearing platform 1100 and a pier body 1200, and after the construction of the pier body 1200 is finished, returning water to dismantle the double-wall steel cofferdam 400;
in this embodiment, in step S5, the inner guide 401 is disposed on the inner wall of the double-wall steel cofferdam 400 and corresponds to the pile-foundation steel casing 500, the inner guide 401 is an arc-shaped sheet metal part attached to the outer wall of the pile-foundation steel casing 500, the bottom of the inner guide 401 is provided with the wedge 402, and the wedge 402 can facilitate the smooth attachment of the inner guide 401 to the pile-foundation steel casing 500 when the double-wall steel cofferdam 400 sinks; it should be noted here that the inner guide 401 is fixed on the inner wall of the double-wall steel cofferdam 400, and the reinforcement is performed at the position where the inner guide 401 is arranged; secondly, in the step S3, a plurality of positioning steel casing drums 600 are respectively arranged on two sides and downstream of the pile foundation steel casing 500 area; in the step S5, the positioning plate 800 is fixed on the top of the downstream positioning steel casing 600, and the upper fine adjustment device is fixed on the tops of the two side positioning steel casings 600, wherein the upper fine adjustment device is a jack 700, and the telescopic end of the jack 700 is fixed with a guide plate 701; it should be added that when the double-wall steel cofferdam 400 enters the area of the pile foundation steel casing 500, there may be a positional deviation, the jack 700 drives the guide plate 701, the guide plate 701 abuts against the outer wall of the double-wall steel cofferdam 400, and the double-wall steel cofferdam 400 can be finely adjusted; the arrangement of the middle positioning plate 800 has a limiting effect on the adjusted double-wall steel cofferdam 400 and bears the impact of water flow on the double-wall steel cofferdam 400.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. A floating transportation, positioning and sinking construction method for a double-wall steel cofferdam with a pile foundation firstly and a cofferdam secondly is characterized by comprising the following steps:
s1, building a construction steel trestle, and assembling a square floating platform in water by adopting a floating box on one side of the construction steel trestle; assembling a bottom cofferdam on the floating platform by using a crane, and fixing a temporary steel support at the top corner of the bottom cofferdam;
s2, pouring water into the buoyancy tank to enable the buoyancy tank to sink until the bottom cofferdam floats in the water, and further enabling the bottom cofferdam to be separated from the floating platform; assembling other sections of cofferdams at the upper part on the bottom section of cofferdam to complete the integral assembly of the double-wall steel cofferdam, and installing an inner support in the double-wall steel cofferdam;
s3, completing pile foundation construction at the pier position, dismantling the drilling platform, and performing underwater cutting on the pile foundation steel casing, so that the top of the pile foundation steel casing is lower than the lower end of the bottom cofferdam;
s4, carrying the assembled double-wall steel cofferdam to a pier position by floating by using tugboats, and pouring wall cabin concrete;
s5, positioning and sinking the double-wall steel cofferdam by using the inner guide piece, the middle positioning plate and the upper fine adjustment device, sinking to a designed elevation and leveling;
and S6, cleaning the foundation in the double-wall steel cofferdam and sealing the bottom, draining the water in the double-wall steel cofferdam after the strength of the bottom sealing concrete meets the requirement, constructing a bearing platform and a pier body, and after the construction of the pier body is finished, returning water to dismantle the double-wall steel cofferdam.
2. The floating transportation, positioning and sinking construction method for the double-wall steel cofferdam with the pile foundation firstly and the cofferdam secondly according to claim 1, wherein the floating platform is fixed by a steel trestle connected by an iron chain in the step S1, and a bottom platform is arranged on the floating platform by adopting sleepers or section steel and used for supporting the bottom cofferdam.
3. The floating transportation, positioning and sinking construction method for the double-wall steel cofferdam with the pile foundation firstly and the cofferdam secondly according to the claim 1, characterized in that the tug arrangement is determined by calculation in the step S4, the local reinforcement is carried out on the cofferdam wall body according to the tug arrangement position and the position change in the floating transportation process, and the tug dragging lifting lugs and the winch dragging and dragging points are welded.
4. The floating transportation, positioning and sinking construction method for the double-wall steel cofferdam with the pile foundation firstly and the cofferdam secondly according to claim 1, wherein after the double-wall steel cofferdam is floated and transported away in the step S4, the buoyancy tank of the floating platform is inflated to press out the water in the buoyancy tank so as to enable the floating platform to float out of the water surface.
5. The floating transportation, positioning and sinking construction method for the double-wall steel cofferdam with the pile foundation firstly and the cofferdam secondly according to claim 1, wherein in the step S3, the top of the pile foundation steel casing is 25-30cm lower than the lower end of the bottom cofferdam in floating transportation.
6. The floating transportation, positioning and sinking construction method for the double-wall steel cofferdam with the pile foundation firstly and the cofferdam secondly according to claim 1, wherein tires are hung on the side wall of the tug close to the double-wall steel cofferdam in the step S4.
7. The floating transportation, positioning and sinking construction method for the double-wall steel cofferdam with the pile foundation firstly and the cofferdam secondly according to claim 1, wherein in the step S5, the inner guide part is arranged on the inner wall of the double-wall steel cofferdam and corresponds to the pile foundation steel casing, the inner guide part is an arc-shaped sheet metal part which is attached to the outer wall of the pile foundation steel casing, and the bottom of the inner guide part is provided with a wedge-shaped block.
8. The floating transportation, positioning and sinking construction method for the double-wall steel cofferdam with the pile foundation firstly and the cofferdam secondly according to claim 1, wherein a plurality of positioning steel casings are respectively arranged at the two sides and the downstream of the pile foundation steel casing area in the step S3; in the step S5, a positioning plate is fixed on the top of the downstream positioning steel pile casing, and an upper fine adjustment device is fixed on the tops of the two side positioning steel pile casings, wherein the upper fine adjustment device is a jack, and a guide plate is fixed on the telescopic end of the jack.
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| CN202111111642.5A CN113774936A (en) | 2021-09-23 | 2021-09-23 | Floating transportation, positioning and sinking construction method for double-wall steel cofferdam with pile foundation firstly and cofferdam secondly |
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| CN202111111642.5A CN113774936A (en) | 2021-09-23 | 2021-09-23 | Floating transportation, positioning and sinking construction method for double-wall steel cofferdam with pile foundation firstly and cofferdam secondly |
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| CN115492141A (en) * | 2022-10-21 | 2022-12-20 | 中铁二院工程集团有限责任公司 | Steel suspension box cofferdam structure and bottom plate and construction method thereof |
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Application publication date: 20211210 |
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