CN207878498U - A kind of tower-crane foundation structure of bridge deepwater foundation pit - Google Patents
A kind of tower-crane foundation structure of bridge deepwater foundation pit Download PDFInfo
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- CN207878498U CN207878498U CN201820229226.2U CN201820229226U CN207878498U CN 207878498 U CN207878498 U CN 207878498U CN 201820229226 U CN201820229226 U CN 201820229226U CN 207878498 U CN207878498 U CN 207878498U
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Abstract
The utility model discloses a kind of tower-crane foundation structures of bridge deepwater foundation pit, including cushion cap, pier stud and tower crane matrix；Fixed first pre-embedded steel slab in the cushion cap upper surface；Fixed second pre-embedded steel slab of the pier stud side wall；The tower crane matrix includes at least one matrix bodies；Each matrix bodies include steel pipe post, first crossbeam and at least one second cross beam；The first crossbeam is fixed in the upper surface of steel pipe post, and at least one second cross beam is respectively and fixedly connected in steel pipe post；The pier stud is fixed on cushion cap, and each matrix bodies are affixed by the lower face of steel pipe post and the first pre-embedded steel slab, affixed by first crossbeam and second cross beam and the second pre-embedded steel slab, and common affixed by each first crossbeam and support standard section of tower crane.Using the technical solution of the utility model, tower-crane foundation structure can be simplified, convenient for construction, reduce tower crane cost.
Description
Technical field
The utility model belongs to bridge construction apparatus field, and in particular to a kind of tower crane knot of bridge deepwater foundation pit
Structure.
Background technology
The common practice that tower crane is arranged in railway, highway bridge deep-water hole has：Inserting piling steel pipe pile foundation in water,
It is embedded to armored concrete Extended chemotherapy or the standard section of tower crane embedment bridge bearing platform basis etc. of anchor bolt.Inserting piling steel pipe pile foundation in water
Driving depth and verticality to steel-pipe pile require height, and current obstruction area is big；It is embedded to the armored concrete Extended chemotherapy body of anchor bolt
Product is big, is influenced greatly on water proximate environment, and later stage dismounting is difficult, is not thorough if removed, can also influence marine vehicle
Navigation safety；It is embedded to standard section of tower crane in cushion cap foundation and causes the prodigious wasting of resources, and bolt is connected positioned at underwater tower body
Current check is difficult, and Operation and Maintenance is inconvenient.As described above, existing tower-crane foundation structure is complicated, constructing operation trouble, cost compared with
Height, therefore, how to design a kind of simple in structure, easy construction again economy, environmental protection steady type water in tower crane, compel
The eyebrows and eyelashes.
Utility model content
Utility model aims to solve problems of the prior art, provide a kind of tower of bridge deepwater foundation pit
Foundation structure is hung, tower-crane foundation structure is simplified, convenient for construction, reduces tower crane cost, in order to achieve the above objectives, this practicality is new
Type adopts the following technical scheme that：
A kind of tower-crane foundation structure of bridge deepwater foundation pit, including cushion cap, pier stud and tower crane matrix；The cushion cap upper table
Fixed first pre-embedded steel slab in face；Fixed second pre-embedded steel slab of the pier stud side wall；The tower crane matrix includes at least one
Matrix bodies；Each matrix bodies include steel pipe post, first crossbeam and at least one second cross beam；The first crossbeam is solid
It is connected to the upper surface of steel pipe post, at least one second cross beam is respectively and fixedly connected in steel pipe post；The pier stud is affixed
In on cushion cap, each matrix bodies are affixed by the lower face of steel pipe post and the first pre-embedded steel slab, pass through first crossbeam and second
Crossbeam and the second pre-embedded steel slab are affixed, and common affixed by each first crossbeam and support standard section of tower crane.
Preferably, the tower crane matrix further includes several first tie-beams；Several affixed phases of first tie-beam
The tube body column and/or first crossbeam of adjacent two matrix bodies.
Preferably, fixed between the first crossbeam and second cross beam of the matrix bodies, and/or between each second cross beam
Second tie-beam, second tie-beam are obliquely installed with respect to first crossbeam and second cross beam.
Preferably, the first crossbeam of each matrix bodies extends outward to form extension in the upper surface of steel pipe post
Beam；Fixed supporting beam between the extending beam free end and steel pipe post.
Preferably, the tower-crane foundation structure further includes standard knot connecting plate, and the standard knot connecting plate is solid respectively
It is connected to the corresponding first crossbeam in upper surface and the free end of extending beam of steel pipe post, with affixed standard section of tower crane.
Preferably, the upper surface of the steel pipe post is affixed with first crossbeam by support plate, to increase steel pipe post
With the contact area of first crossbeam.
Preferably, the first crossbeam, second cross beam and supporting beam are Two bors d's oeuveres steel I-beam.
From the above description of the utility model, it can be seen, compared with the existing technology, the utility model has following beneficial to effect
Fruit：
(1) in the technical solution of the utility model, during the cofferdam construction of pier stud, in advance on pier stud setting and pier
The cushion cap that column fixes as one, and the tower crane matrix affixed with cushion cap and pier stud is set, tower-crane foundation structure is collectively formed, fills
Point ground of the buried secured ground of pier stud as tower crane is utilized, it is therefore not necessary to the still further steel pipe of inserting piling tower crane in water
Pile foundation greatly reduces the construction cost of tower crane；
(2) during the cofferdam construction of pier stud and cushion cap, it is embedded to the first pre-embedded steel slab on cushion cap in advance, on pier stud in advance
It is embedded to the second pre-embedded steel slab, tower crane matrix is affixed by the first pre-embedded steel slab and cushion cap, solid by the second pre-embedded steel slab and pier stud
It connects, is convenient for the construction of tower-crane foundation structure；
(3) first pre-embedded steel slabs and the second pre-embedded steel slab are fixed by welding on cushion cap and pier stud reinforcing bar, and cushion cap
Reinforcing bar with pier stud is in the two work progress, by banding fixed, thus it is ensured that tower crane matrix, cushion cap and pier stud
It is firm affixed；
(4) tower crane matrix includes at least one matrix bodies, and each matrix bodies pass through steel pipe post lower face and cushion cap
Affixed, the axis by the load of tower crane along steel pipe post is transmitted to cushion cap, affixed by first crossbeam and second cross beam and pier stud,
Ensure that steel pipe post is stablized vertically, it is not skewed；
(5) between each matrix bodies, adjacent steel pipe post and/or first crossbeam are connected by the first tie-beam so that
It mutually limits and fixes as one between each matrix bodies, further improve the stability and reliability of tower crane matrix；
(6) connected by fixed second be obliquely installed between first crossbeam and second cross beam, and/or between second cross beam
Connect beam, it is preferred that the second tie-beam is fixed along the diagonal line of adjacent beams, is further promoted using the stability principle of triangle
Stability and reliability between each crossbeam；
(7) first crossbeam of each matrix bodies extends outward to form extending beam in the upper surface of steel pipe post, and is extending
Fixed supporting beam between beam free end and steel pipe post, with diagonal brace extending beam；The standard knot connecting plate of tower-crane foundation structure is affixed
In the corresponding first crossbeam position in the upper surface of steel pipe post and the free end of extending beam so that standard section of tower crane is above-mentioned
It is fixed in tower crane on the standard knot connecting plate of position, passes through the common work of first crossbeam, the second tie-beam and supporting beam
With, it is ensured that the load of tower crane is all transferred to cushion cap by steel pipe post, promotes the stability and reliability of tower crane；
(8) by the way that support plate is arranged in the upper surface of steel pipe post so that steel pipe post passes through support plate and first crossbeam
It is affixed, increase the contact area of steel pipe post and first crossbeam so that the load of first crossbeam is more uniformly distributed to steel pipe
On column, the stability of tower crane is promoted；
(9) first crossbeam, second cross beam and supporting beam are all made of Two bors d's oeuveres steel I-beam, convenient material drawing, and sound construction, carry
The load capacity of tower crane is risen；
(10) tower-crane foundation structure for using the utility model, is arranged cushion cap, without in addition setting using on the basis of pier stud
The armored concrete Extended chemotherapy for setting embedment anchor bolt reduces the influence to water proximate environment, and without removing cushion cap, only needs
Steel pipe post is cut off under water, cuts off first crossbeam and second cross beam, you can integrally hangs tower crane matrix, it is convenient to remove, Bu Huiying
Ring the navigation safety of marine vehicle；
(11) tower-crane foundation structure of the utility model only need to be embedded to the first pre-embedded steel slab and second on cushion cap and pier stud
Pre-embedded steel slab greatly reduces the waste of structure of steel product, reduces tower crane without giving birth to embedment standard section of tower crane in cushion cap
Construction cost；
(12) tower-crane foundation structure of the utility model selects steel pipe appropriate vertical according to the depth profile in construction waters
Column length ensures tower crane in use, and tower crane matrix only has steel pipe post part under water, and tower crane matrix remaining
Part, including first crossbeam, second cross beam, the first tie-beam, the second tie-beam and supporting beam are respectively positioned on above water, facilitate
The daily maintenance inspection of tower crane, it is easy to operate.
Description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the utility model,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is the tower-crane foundation structure dimensional structure diagram of the utility model embodiment；
Fig. 2 is the tower-crane foundation structure configuration schematic diagram of Fig. 1；
Fig. 3 is the tower crane matrix schematic diagram of the tower-crane foundation structure of Fig. 1；
Fig. 4 is the standard knot supporting ring beam of the tower crane matrix of Fig. 3.
Wherein, 10 be cushion cap, and 11 be the first pre-embedded steel slab；20 be pier stud, and 21 be the second pre-embedded steel slab；30 be tower crane base
Body, 31 be matrix bodies, and 311 be steel pipe post, and 312 be first crossbeam, and 313 be second cross beam, and 314 be the second tie-beam, 315
It is supporting beam for extending beam, 316,317 be support plate, and 32 be the first tie-beam, and 33 be standard knot connecting plate.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe.Obviously, described embodiment is the preferred embodiment of the utility model, and is not to be seen as to it
The exclusion of his embodiment.Based on the utility model embodiment, those skilled in the art are not before making creative work
The every other embodiment obtained is put, shall fall within the protection scope of the present invention.
In claims of the utility model, specification and above-mentioned attached drawing, unless otherwise specifically limited, term is such as used
" first ", " second " or " third " etc. is provided to distinguish different objects, rather than for describing particular order.
In claims of the utility model, specification and above-mentioned attached drawing, unless otherwise specifically limited, for orientation
Word, such as using term "center", " transverse direction ", " longitudinal direction ", "horizontal", " vertical ", "top", "bottom", "inner", "outside", "upper",
The indicating positions such as "lower", "front", "rear", "left", "right", " clockwise ", " counterclockwise " or position relationship are based on shown in attached drawing
Orientation and position relationship, and be merely for convenience of narration the utility model and simplify to describe, rather than indicate or imply signified
Device or element must have a particular orientation or with specific azimuth configuration and operation, so can not be interpreted as limitation this
The specific protection domain of utility model.
In claims of the utility model, specification and above-mentioned attached drawing, unless otherwise specifically limited, term is such as used
" affixed " or " being fixedly connected ", should broadly understood, i.e., between the two without any company of displacement relation and relative rotation relationship
Connect mode, that is to say, that including being unremovably fixedly connected with, being removably secured connection, be linked together and by other dresses
It sets or element is fixedly connected.
In claims of the utility model, specification and above-mentioned attached drawing, such as using term " comprising ", " having " and
Their deformation, it is intended that " including but not limited to ".
Please referring also to Fig. 1 to Fig. 3, a kind of tower-crane foundation structure of bridge deepwater foundation pit provided in this embodiment include holding
Platform 10, pier stud 20 and tower crane matrix 30.Wherein：
Cushion cap 10 and pier stud 20 use cofferdam construction mode, after being driven piles by pile pile, reinforcing bar binding, concrete formed by integrally casting
Molding.10 upper surface of cushion cap is fixed, and there are two the first pre-embedded steel slab 11, fixed four the second pre-embedded steel slabs 21 of 20 side wall of pier stud.
During cushion cap 10 and pier stud 20 are constructed, when reinforcing bar is bound, according to calculating, the first pre-embedded steel slab 11 is weldingly fixed on steel pipe post
Second pre-embedded steel slab 21 on the reinforcing bar at 10 link position of cushion cap, is weldingly fixed on first crossbeam 312, second cross beam by 311
313 on the reinforcing bar of 20 junction of pier stud, and after making concreting, the first pre-embedded steel slab 11, the second pre-embedded steel slab 21 are tight
Paste the concrete surface after pouring.
In the present embodiment, tower crane matrix 30 is connected including two matrix bodies 31, several first tie-beams 32 with standard knot
Plate 33.Each matrix bodies 31 include steel pipe post 311, first crossbeam 312, second cross beam 313, the second tie-beam 314, prolong
Beam 315, supporting beam 316 and support plate 317.Wherein, steel pipe post 311 uses steel cylindrical tube, first crossbeam 312, second
Crossbeam 313, extending beam 315 and supporting beam 316 use Two bors d's oeuveres I-shaped steel section, the first tie-beam 32 to use I-shaped steel section.
The lower face of every steel pipe post 311 is perpendicular by ring flange and first pre-embedded steel slab 11 of 10 upper surface of cushion cap
Directly it is fixedly connected.Support plate 317 is fixedly welded on the upper surface of steel pipe post 311, and support plate 317 uses square plank,
The length of side is more than the diameter of steel pipe post 311, to increase the contact area of steel pipe post 311 and first crossbeam 312, extending beam 315.
First crossbeam 312 and extending beam 315 are vertically fixed with 311 axis of opposite steel pipe post by being welded and fixed with support plate 317
Above steel pipe post 311, and in the present embodiment, the end that first crossbeam 312 and extending beam 315 are connected with each other is welded jointly
It is fixed on the top of steel pipe post 311, the other end of first crossbeam 312 is pre-buried by corresponding with 20 side wall of pier stud second
Steel plate 21 is fixed in pier stud 20；311 side wall of free end lower surface and steel pipe post of 316 affixed extending beam 315 of supporting beam, with
Triangular support is formed between extending beam 315 and steel pipe post 311, enhances the stability and intensity of matrix bodies 31.Second
Crossbeam 313 with first crossbeam 312 is coplanar is arranged in parallel, wherein one end is fixed in 311 side wall of steel pipe post, and the other end is fixed in
Corresponding second pre-embedded steel slab 21 on 20 side wall of pier stud.In addition, in the present embodiment, first crossbeam 312 and second cross beam 313 it
Between, it is diagonal affixed by the second tie-beam 314, to enhance the structural stability of first crossbeam 312 and second cross beam 313, promoted
To the fixed effect of steel pipe post 311.
As shown in figure 3, two matrix bodies 31 in the present embodiment are symmetrical fixed, several first connections are set between the two
Beam 32, each first tie-beam 32 are separately connected the first crossbeam 312, extending beam 315 and steel pipe post of two matrix bodies 31
311 so that two matrix bodies 31 fix as one, and mutually support, to form firm tower crane matrix 30.As shown in figure 4,
In 30 structure of tower crane matrix, each first crossbeam 312, extending beam 315 and the first tie-beam 32 between the two collectively constitute " well "
The standard knot supporting ring beam of font.In the upper surface of standard knot supporting ring beam, the fixed four standard knot connecting plates 33 of difference, wherein
Two standard knot connecting plates 33 are weldingly fixed on the link position of first crossbeam 312 and extending beam 315, i.e. steel pipe post 311
Position directly above, other two standard knot connecting plate 33 are weldingly fixed on the free end upper surface of extending beam 315.
The tower-crane foundation structure of the present embodiment binds concreting using reinforcing bar by cofferdam construction and builds in construction
The integral cushion cap 10 of appearance and pier stud 20 are welded and fixed 11 He of the first pre-embedded steel slab when reinforcing bar is bound in corresponding position
Second pre-embedded steel slab 21；It waits for concrete setting and reaches defined intensity, carry out the installation of tower crane matrix 30.
In order to accelerate the installation progress of tower crane matrix 30, installation difficulty is reduced, according to arrangement and method for construction and design drawing, in steel
Structure processing factory makes steel pipe post 311 and standard knot supporting ring beam is consigned with automobile to construction site after quality inspection qualification,
Divide lifting component installation：First by two steel pipe posts 311, according to design position, cushion cap 10 is fixedly installed in by ring flange
It on first pre-embedded steel slab 11, when installation, is positioned using total station survey, ensures the vertical degree of steel pipe post 311；Then in steel pipe
The upper surface welded support plate 317 of column 311, standard knot supporting ring beam is hoisted on support plate 317, is welded after putting on right position
It is fixed, while first crossbeam 312 being welded and fixed with corresponding second pre-embedded steel slab 21.
When site operation, except the first tie-beam 32 welded in standard knot supporting ring beam, remaining first tie-beam 32,
Second cross beam 313, the second tie-beam 314 and supporting beam 316, all in accordance with to mounted structure actual conditions and actual range,
On-site cutting is simultaneously installed：First install second cross beam 313, by second cross beam 313 be hoisted to installation site and with steel pipe post 311
It is welded and fixed with corresponding second pre-embedded steel slab 21；Then it is welded on the diagonal line between first crossbeam 312 and second cross beam 313
The second tie-beam 314 is connect, supporting beam 316, and root are welded between the free end of extending beam 315 and the side wall of steel pipe post 311
According to actual conditions, several are welded further between the first crossbeam 312 and steel pipe post 311 between two matrix bodies 31
One tie-beam 32 promotes intensity and stability to reinforce tower crane matrix 30；It should be noted that in each first tie-beam 32, the
In the welding process of two crossbeams 313, the second tie-beam 314 and supporting beam 316, bracing wire and dipstick metering should be used to survey, it is ensured that structure
The overall stability of the precision and tower crane matrix 30 of installation；Finally, it in standard knot supporting ring beam, is welded according to the position of design
Standard knot connecting plate 33 is used for affixed standard knot pedestal, fixed standard section of tower crane is bolted.
In addition, because steel pipe post 311 and the first pre-embedded steel slab 11 are in water for a long time, in tower crane matrix 30, installation is complete
Afterwards, need to the steel surface of the underwater portion of tower crane according to《Railway steel bridge protects application and coating supply of material technical conditions》
(TB/T1527-2011) brushing corrosion-inhibiting coating is carried out, specific practice is as follows：Brushing epoxy zinc-rich anti-corrosive primer 1, film thickness
80 μm, brushing epoxy micaceous iron oxide rustproof paint face layer 2,80 μm of film thickness, corrosion-inhibiting coating brushing 3 times, overall thickness is not less than 160 μ
m.It, need to be pre- to the first pre-embedded steel slab 11 and second positioned at underwater cushion cap 10, pier stud 20 after tower crane 30 underwater demolition of matrix
It buries steel plate 21 and carries out preservative treatment, underwater preservative treatment uses wet type spread coating technique, sends 1 diver to dive beneath the water, first use
Wire brush, steel shovel etc. remove surface of steel plate iron rust, old paint film, then use underwater Sa2.5 blasting treatments；Finally by diver with
Rubber gloves uniformly blade coating or brush the water-repellent paint prepared on surface of steel plate, and squeezing using scrub-brush or rubber squeegee
Pressure acts on, and water exclusion in surface is opened, and makes coating attachment on the steel surface until solidification.
The description of description above and embodiment for explaining scope of protection of the utility model, but is not constituted to this reality
With the restriction of novel protected range.By the enlightenment of the utility model or above-described embodiment, those of ordinary skill in the art combine
Common knowledge, the ordinary technical knowledge of this field and/or the prior art pass through logical analysis, reasoning or limited examination
Test it is available to the modification of the utility model embodiment or in which a part of technical characteristic, equivalent replacement or other improvements,
It should be included within the scope of protection of this utility model.
Claims (7)
1. a kind of tower-crane foundation structure of bridge deepwater foundation pit, it is characterised in that：Including cushion cap, pier stud and tower crane matrix；
Fixed first pre-embedded steel slab in the cushion cap upper surface；Fixed second pre-embedded steel slab of the pier stud side wall；The tower
It includes at least one matrix bodies to hang matrix；Each matrix bodies include steel pipe post, first crossbeam and at least one second cross
Beam；The first crossbeam is fixed in the upper surface of steel pipe post, and at least one second cross beam is respectively and fixedly connected in steel pipe
Column；
The pier stud is fixed on cushion cap, and each matrix bodies are affixed by the lower face of steel pipe post and the first pre-embedded steel slab,
It is affixed by first crossbeam and second cross beam and the second pre-embedded steel slab and common affixed by each first crossbeam and support tower crane mark
Quasi- section.
2. a kind of tower-crane foundation structure of bridge deepwater foundation pit as described in claim 1, it is characterised in that：The tower crane base
Body further includes several first tie-beams；The steel pipe post of the affixed two neighboring matrix bodies of several first tie-beams and/
Or first crossbeam.
3. a kind of tower-crane foundation structure of bridge deepwater foundation pit as described in claim 1, it is characterised in that：The matrix sheet
Fixed second tie-beam, second tie-beam between the first crossbeam and second cross beam of body, and/or between each second cross beam
Opposite first crossbeam and second cross beam are obliquely installed.
4. a kind of tower-crane foundation structure of bridge deepwater foundation pit as described in claim 1, it is characterised in that：Each matrix
The first crossbeam of ontology extends outward to form extending beam in the upper surface of steel pipe post；The extending beam free end is vertical with steel pipe
Fixed supporting beam between column.
5. a kind of tower-crane foundation structure of bridge deepwater foundation pit as claimed in claim 4, it is characterised in that：The tower crane base
Plinth structure further includes standard knot connecting plate, and the standard knot connecting plate is respectively and fixedly connected in the upper surface of steel pipe post corresponding
The free end of one crossbeam and extending beam, with affixed standard section of tower crane.
6. a kind of tower-crane foundation structure of bridge deepwater foundation pit as claimed in claim 4, it is characterised in that：The steel pipe is vertical
The upper surface of column is affixed with first crossbeam by support plate, to increase the contact area of steel pipe post and first crossbeam.
7. a kind of tower-crane foundation structure of bridge deepwater foundation pit as claimed in claim 4, it is characterised in that：Described first is horizontal
Beam, second cross beam and supporting beam are Two bors d's oeuveres steel I-beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820229226.2U CN207878498U (en) | 2018-02-08 | 2018-02-08 | A kind of tower-crane foundation structure of bridge deepwater foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820229226.2U CN207878498U (en) | 2018-02-08 | 2018-02-08 | A kind of tower-crane foundation structure of bridge deepwater foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207878498U true CN207878498U (en) | 2018-09-18 |
Family
ID=63498127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820229226.2U Active CN207878498U (en) | 2018-02-08 | 2018-02-08 | A kind of tower-crane foundation structure of bridge deepwater foundation pit |
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| CN (1) | CN207878498U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653236A (en) * | 2019-01-29 | 2019-04-19 | 中铁大桥局集团第四工程有限公司 | Tower-crane foundation structure for restricted clearance |
| CN112030746A (en) * | 2020-04-22 | 2020-12-04 | 中铁广州工程局集团桥梁工程有限公司 | Method for dismantling water retaining steel cofferdam in advance in bridge construction |
-
2018
- 2018-02-08 CN CN201820229226.2U patent/CN207878498U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653236A (en) * | 2019-01-29 | 2019-04-19 | 中铁大桥局集团第四工程有限公司 | Tower-crane foundation structure for restricted clearance |
| CN112030746A (en) * | 2020-04-22 | 2020-12-04 | 中铁广州工程局集团桥梁工程有限公司 | Method for dismantling water retaining steel cofferdam in advance in bridge construction |
| CN112030746B (en) * | 2020-04-22 | 2021-10-15 | 中铁广州工程局集团桥梁工程有限公司 | Method for dismantling water retaining steel cofferdam in advance in bridge construction |
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