CN212052819U - Combined dumbbell type double-walled steel cofferdam back cover structure - Google Patents
Combined dumbbell type double-walled steel cofferdam back cover structure Download PDFInfo
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- CN212052819U CN212052819U CN201922493643.5U CN201922493643U CN212052819U CN 212052819 U CN212052819 U CN 212052819U CN 201922493643 U CN201922493643 U CN 201922493643U CN 212052819 U CN212052819 U CN 212052819U
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Abstract
The utility model provides a combined type dumbbell type double-walled steel cofferdam back cover structure, including ton bag, cobble shutoff layer, braided bag, rubble backfill layer and screed-coat. Piling a ton bag at the upstream of the cofferdam, then throwing and filling a pebble blocking layer, and stacking a woven sand bag inside to block; the bottom sealing concrete is symmetrically divided into cabins and blocks and is poured from the periphery to the middle at one time. The utility model has the characteristics of the shutoff prevention of seepage nature is good, anti impact strength can the reinforce and the back cover concrete is of high quality etc, be applicable to the construction of the combined type dumbbell type double-walled steel cofferdam back cover in complicated rock stratum waters.
Description
Technical Field
The utility model relates to a bridge deep water basis cushion cap cofferdam construction technical field, concretely relates to combined type dumbbell type double-walled steel cofferdam back cover structure.
Background
The bridge foundation is a part of a bridge lower structure in contact with a foundation, and the bridge foundation with the water depth of more than 5-6 m is generally called as a bridge deep water foundation in engineering. Bridge deepwater foundation construction generally needs to solve two problems: the construction of a bored pile platform and the construction of an underwater bearing platform and a pier (tower) body. The construction of the bearing platform and the pier (tower) body is carried out in a waterless environment, so that a temporary maintenance structure, namely a cofferdam, is firstly constructed to form a waterproof structure when the bearing platform and the pier (tower) body buried under water are constructed, so that the bearing platform and the pier (tower) body can be conveniently constructed. At present, bridge deepwater foundation construction cofferdams mainly comprise the following components: steel sheet pile cofferdam, hasp steel-pipe pile cofferdam, steel hanging box cofferdam, steel jacket box cofferdam and double-walled steel cofferdam etc..
The research aiming at the double-wall steel cofferdam is mostly concentrated on the circular double-wall steel cofferdam, the construction technology is mature day by day, however, the research on the dumbbell type double-wall steel cofferdam is less, and the influence of water flow scouring is generated in the mud sucking and bottom sealing stage, after the cofferdam is sunk in place, the bottom is easy to be void, so that peripheral mud and sand flow into and concrete string in the cofferdam to influence the quality of bottom sealing concrete, and therefore, the cofferdam is necessary to be ensured to be closed and the compartment is independent in the mud sucking and bottom sealing process of the cofferdam.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the prior art, provide a combined type dumbbell type double-walled steel cofferdam back cover structure that has characteristics such as the shutoff prevention of seepage nature is good, anti impact capability is strong and back cover concrete is of high quality.
For realizing above purpose, this technical scheme provides a combined type dumbbell type double-walled steel cofferdam back cover structure, carries out the back cover to combined type dumbbell type double-walled steel cofferdam, and combined type dumbbell type double-walled steel cofferdam sinks to riverbed face design elevation, includes: the gravel-filled bag comprises a ton bag, a pebble plugging layer, a woven bag, a gravel backfill layer and a leveling layer; wherein ton bag pile up the upper reaches department at the sword foot of combined type dumbbell type double-walled steel cofferdam, and the pebble blocking layer is jettisoned and is filled in ton bag top, and the braided bag is piled up on the inside riverbed face design elevation of combined type dumbbell type double-walled steel cofferdam, and rubble backfill layer is laid in the braided bag top, and the screed-coat is pour in rubble backfill layer top.
In some embodiments, the inner wall plate of the composite dumbbell-type double-wall steel cofferdam and the outer side of the steel casing placed in the composite dumbbell-type double-wall steel cofferdam are integrally bonded by means of back cover concrete.
In some embodiments, the ton bag contains fine sand.
In some embodiments, the woven bag is filled with cement and medium grit.
In some embodiments, the bottom sealing concrete is poured in a manner of dividing the cabin and symmetrically dividing the block from the periphery to the middle.
In some embodiments, a pebble blanket is dumped at the upstream side of the ton bag inclined to the composite dumbbell-type double-walled steel cofferdam.
In some embodiments, the cap is placed within a composite dumbbell-type double-walled steel cofferdam.
The utility model discloses compare prior art's beneficial effect lies in: by adopting the method that the pebble blocking layer is thrown and filled after the ton bags are stacked at the upstream, and the woven sand bags are stacked in the cofferdam, the sealing performance of the cofferdam is reliable, the flatness is good, and the phenomena of mud-sand inflow and concrete cabin crossing can be effectively prevented; the bottom sealing concrete is symmetrically poured in blocks and poured from the periphery to the middle, and the bottom sealing quality is good.
Drawings
Fig. 1 is a schematic view of a combined dumbbell-shaped double-walled steel cofferdam bottom sealing structure according to an embodiment of the present invention.
Fig. 2 is a concrete pouring sequence diagram of the combined dumbbell-type double-wall steel cofferdam bottom sealing structure according to an embodiment of the present invention.
In the figure: 1-an outer wall plate; 2-inner wall plate; 3-bottom bay; 4-double-walled cabins; 5, internal support; 6-sealing bottom concrete; 7-designing elevation of the river bed surface; 8-a first platform; 9-a second platform; 10-a cushion cap; 11-a blade leg; 12-a steel casing; 13-ton bag; 14-pebble plugging layer; 15-woven bag; 16-gravel backfill layer; 17-leveling layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purposes of limitation.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Combined type dumbbell type double-walled steel cofferdam back cover structure carries out the back cover to combined type dumbbell type double-walled steel cofferdam, and combined type dumbbell type double-walled steel cofferdam sinks to riverbed surface design elevation (7), includes: a ton bag (13), a pebble plugging layer (14), a woven bag (15), a broken stone backfill layer (16) and a leveling layer (17).
The fine sand filled in the ton bag (13) is stacked at the upstream of the cutting edge (11) of the combined dumbbell type double-wall steel cofferdam, the pebble blocking layer (14) is filled above the ton bag (13) in a throwing mode, cement and medium-coarse sand filled in the woven bag (15) are stacked above the designed elevation (7) of the riverbed surface inside the combined dumbbell type double-wall steel cofferdam, the broken stone backfill layer (16) is laid above the woven bag (15), and the leveling layer (17) is poured above the broken stone backfill layer (16).
The outer sides of an inner wall plate (2) of the combined dumbbell type double-wall steel cofferdam and a steel pile casing (12) arranged in the combined dumbbell type double-wall steel cofferdam are bonded into a whole through back cover concrete (6), the back cover concrete (6) is symmetrically partitioned and cast from the periphery to the middle in a pouring mode.
And (3) sequentially carrying out launching, floating transportation, positioning and lowering on the composite dumbbell-shaped double-wall steel cofferdam, pouring concrete on the bottom bulkhead (3) and the blade leg (11), absorbing mud and the like in the process, and sinking the composite dumbbell-shaped double-wall steel cofferdam to the designed elevation (7) of the river bed surface.
Wherein the pebble blocking layer (14) is thrown and filled in the ton bag (13) and is obliquely arranged on the upstream side of the composite dumbbell-shaped double-wall steel cofferdam.
As shown in fig. 1, the composite dumbbell-shaped double-wall steel cofferdam in the embodiment is formed by assembling unit structures, is dumbbell-shaped, and mainly comprises an outer wall plate (1), an inner wall plate (2), bottom compartments (3), a double-wall cabin (4), an inner support (5), a first platform (8), a second platform (9), blade feet (11) and the like, wherein the outer wall plate (1), the inner wall plate (2) and the blade feet (11) are combined to form the double-wall cabin (4), the double-wall cabin (4) sinks to a riverbed surface design elevation (7), the two bottom compartments (3) and the inner support (5) are symmetrically welded at the lower end and the upper end of the narrow middle part of the composite dumbbell-shaped double-wall steel cofferdam respectively, and the first platform (8) and the second platform (9) are arranged in the composite dumbbell-shaped double-wall steel cofferdam in parallel and are used for drilling and inserting and beating steel pile.
As shown in fig. 1, after the cofferdam is lowered in place, the riverbed near the cofferdam is desilted. Then, piling a ton bag (13) filled with fine sand powder at the upstream of the cofferdam, and throwing and filling a pebble blocking layer (14) on the ton bag; a woven bag (15) filled with cement and medium coarse sand is stacked inside the cofferdam, a broken stone backfill layer (16) and a concrete pouring leveling layer (17) are sequentially paved.
As shown in figure 2, the surfaces of the inner wall plate (2) and the steel casing (12) are cleaned, underwater concrete pouring is carried out by adopting a vertical conduit method, according to the principle that the casting is carried out symmetrically in a subdivision mode and in a block mode, and the pouring sequence is marked by the numbers shown in the figure from the periphery to the middle, and finally, the bottom sealing concrete (6) is formed by one-time pouring. And after the strength of the bottom sealing concrete (6) meets the requirement, pouring to form the bearing platform (10) in the figure 1.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides a combined type dumbbell type double-walled steel cofferdam back cover structure carries out the back cover to combined type dumbbell type double-walled steel cofferdam, and combined type dumbbell type double-walled steel cofferdam sinks to riverbed surface design elevation (7), its characterized in that includes: a ton bag (13), a pebble plugging layer (14), a woven bag (15), a broken stone backfill layer (16) and a leveling layer (17);
the method is characterized in that a ton bag (13) is stacked at the upstream of a cutting edge (11) of the combined dumbbell type double-wall steel cofferdam, a pebble blocking layer (14) is filled above the ton bag (13) in a throwing mode, a woven bag (15) is stacked above a designed river bed surface elevation (7) in the combined type dumbbell type double-wall steel cofferdam, a gravel backfill layer (16) is laid above the woven bag (15), and a leveling layer (17) is poured above the gravel backfill layer (16).
2. The combined dumbbell type double-wall steel cofferdam back cover structure of claim 1, characterized in that the inner wall plate (2) of the combined dumbbell type double-wall steel cofferdam and the outside of the steel casing (12) placed in the combined dumbbell type double-wall steel cofferdam are bonded into a whole by the back cover concrete (6).
3. The combined dumbbell type double-wall steel cofferdam bottom sealing structure of claim 1, characterized in that the ton bag (13) is filled with fine sand.
4. The combined dumbbell type double-wall steel cofferdam back cover structure of claim 1, characterized in that the woven bag (15) is filled with cement and medium coarse sand.
5. The combined type dumbbell type double-wall steel cofferdam back cover structure of claim 2, characterized in that the back cover concrete (6) is poured in a manner of dividing the cabin, dividing the block symmetrically, and pouring from the periphery to the middle.
6. The combined dumbbell type double-wall steel cofferdam bottom sealing structure of claim 1, characterized in that the pebble plugging layer (14) is dumped on the upstream side of the combined dumbbell type double-wall steel cofferdam with the ton bag (13) inclined.
7. The composite dumbbell type double-wall steel cofferdam bottom sealing structure of claim 1, characterized in that the bearing platform (10) is placed inside the composite dumbbell type double-wall steel cofferdam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922493643.5U CN212052819U (en) | 2019-12-31 | 2019-12-31 | Combined dumbbell type double-walled steel cofferdam back cover structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922493643.5U CN212052819U (en) | 2019-12-31 | 2019-12-31 | Combined dumbbell type double-walled steel cofferdam back cover structure |
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| Publication Number | Publication Date |
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| CN212052819U true CN212052819U (en) | 2020-12-01 |
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| CN201922493643.5U Active CN212052819U (en) | 2019-12-31 | 2019-12-31 | Combined dumbbell type double-walled steel cofferdam back cover structure |
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| CN (1) | CN212052819U (en) |
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Denomination of utility model: Composite dumbbell double wall steel cofferdam bottom sealing structure Effective date of registration: 20230927 Granted publication date: 20201201 Pledgee: Industrial Bank Limited by Share Ltd. Wuhan branch Pledgor: HUBEI PROVINCIAL ROAD & BRIDGE Co.,Ltd. Registration number: Y2023980059401 |