CN216075194U - Bank segment cofferdam construction platform for variable replacement rate composite foundation stabilization - Google Patents
Bank segment cofferdam construction platform for variable replacement rate composite foundation stabilization Download PDFInfo
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- CN216075194U CN216075194U CN202122313444.9U CN202122313444U CN216075194U CN 216075194 U CN216075194 U CN 216075194U CN 202122313444 U CN202122313444 U CN 202122313444U CN 216075194 U CN216075194 U CN 216075194U
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Abstract
The utility model discloses a bank segment cofferdam construction platform for reinforcing a variable replacement rate composite foundation, which comprises a cofferdam body, backfill soil, a foundation reinforcement body and a platform surface layer. The cofferdam body is formed by mutually connecting a plurality of lock catch steel pipe piles, the plane of the cofferdam body is circular or rectangular, and one part of the cofferdam body is positioned in the water area; the backfill soil is filled in the cofferdam body after dry water is pumped in the cofferdam body, and the top surface of the backfill soil is higher than the water surface; the foundation reinforcement is a reinforcing pile arranged in backfill soil in the cofferdam body to form a composite foundation of the construction platform; the pile spacing of the reinforcing piles is gradually increased from the water-facing edge of the land area to the land area side, and the pile length is gradually decreased from the water area side to the land area side; the platform surface layer comprises a gravel cushion layer and a concrete surface layer which are sequentially paved on the top surface of the composite foundation of the construction platform. The utility model can avoid the later uneven settlement and improve the safety and the stability.
Description
Technical Field
The utility model relates to a bank segment cofferdam construction platform for reinforcing a variable replacement rate composite foundation.
Background
In recent years, with the development of engineering construction such as water transportation and bridges, more and more foundation construction platforms need to be installed on bank slope sections of rivers and lakes. The soil layer of the river bank segment (bank slope segment) is often distributed greatly, and is influenced by river erosion and seepage, and the geological condition is more complicated. The construction platform at the river bank section usually adopts a method of backfilling soil bodies on the inner side of the cofferdam, but because the backfilling soil bodies at the underwater part cannot be compacted, the bearing capacity of the construction platform is lower, the later settlement is large, and in addition, complex geological factors such as uneven distribution of soil layers of the river bank section and the like are caused, uneven settlement of the construction platform under the load effect in the service period is large, and the ground settlement can possibly occur in serious cases, so that the use requirement is difficult to meet.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a bank segment cofferdam construction platform reinforced by a variable replacement rate composite foundation, which can avoid later-stage uneven settlement and improve safety and stability.
The purpose of the utility model is realized as follows: a bank segment cofferdam construction platform for reinforcing a variable replacement rate composite foundation comprises a cofferdam body, backfill, a foundation reinforcement and a platform surface layer; wherein the content of the first and second substances,
the cofferdam body is formed by mutually connecting a plurality of lock catch steel pipe piles, the plane of the cofferdam body is circular or rectangular, and one part of the cofferdam body is positioned in the water area;
the backfill soil is filled in the cofferdam body after being drained, and the top surface of the backfill soil is higher than the water surface;
the foundation reinforcement is a reinforcing pile arranged in backfill soil in the cofferdam body to form a composite foundation of the construction platform; the pile spacing of the reinforcing piles is gradually increased from the water-facing edge of the land area to the land area side, and the pile length is gradually decreased from the water area side to the land area side;
the platform surface layer comprises a gravel cushion layer and a concrete surface layer which are sequentially paved on the top surface of the composite foundation of the construction platform.
The riverbank section cofferdam construction platform reinforced by the variable replacement rate composite foundation is characterized in that the lock catch steel pipe pile is composed of a steel pipe pile body, and a male lock notch and a female lock notch which are welded on the steel pipe pile body, wherein the male lock notch is made of I-shaped steel, the female lock notch is an open steel pipe with the diameter smaller than that of the steel pipe pile body, and the male lock notch and the female lock notch are arranged along the outer surface of the steel pipe pile body at an angle of 180 degrees.
The bank section cofferdam construction platform reinforced by the variable replacement rate composite foundation is characterized in that the backfill soil is sandy soil.
The bank segment cofferdam construction platform for reinforcing the variable replacement rate composite foundation is characterized in that the reinforcing piles adopt cement mixing piles, CFG piles, sand piles or gravel piles.
The bank segment cofferdam construction platform reinforced by the variable replacement rate composite foundation is characterized in that the thickness of the broken stone cushion layer is 5 cm-10 cm; the thickness of the concrete surface layer is 20 cm.
The bank segment cofferdam construction platform reinforced by the variable replacement rate composite foundation provided by the utility model is characterized in that a plurality of fore shaft steel pipe piles are mutually connected to form a closed cofferdam body; forming a ground which is higher than the horizontal plane and has a uniform elevation by backfilling soil in the cofferdam body and leveling; the composite foundation of the construction platform is formed by driving the cement mixing piles in the backfill soil, the bearing capacity of the construction platform is improved by utilizing the reinforcing effect of the composite foundation, the settlement of the service life is reduced, reinforcing piles with different pile lengths and pile intervals are arranged at different positions, the later-stage uneven settlement is avoided, and the safety and the stability of the riverbank section cofferdam construction platform can be improved.
Drawings
FIG. 1 is an elevation view of a bank section cofferdam construction platform of the present invention;
fig. 2 is a plan view of a locking steel pipe pile in the bank segment cofferdam construction platform of the present invention.
Detailed Description
The utility model will be further explained with reference to the drawings.
Referring to fig. 1 and 2, the bank section cofferdam construction platform for reinforcing the variable replacement rate composite foundation of the utility model is mainly used for the construction of foundation structures such as pile foundations and piers of the bank section, and the construction platform comprises a cofferdam body 1, backfill 2, a foundation reinforcement 3 and a platform surface layer; wherein the content of the first and second substances,
the cofferdam body 1 is formed by connecting a plurality of lock catch steel pipe piles, the plane of the cofferdam body is circular or rectangular, and one part of the cofferdam body 1 is positioned in the water area; the lock catch steel pipe pile comprises a steel pipe pile body 10, and a male lock opening 11 and a female lock opening 12 which are welded on the steel pipe pile body 10, wherein the male lock opening 11 is made of I-shaped steel, and the female lock opening 12 is an open steel pipe with the diameter smaller than that of the steel pipe pile body; the male locking notch 11 and the female locking notch 12 are arranged at 180 ° along the outer surface of the steel pipe pile body 10. A wing plate at one end of the I-shaped steel is welded on the outer surface of the steel pipe pile 10 through two round steels 13 with the diameter of phi 6 mm; the small-diameter opening steel pipe is also welded on the outer surface of the steel pipe pile 10 through two round steel 13 with the diameter of phi 6 mm;
the backfill soil 2 is sandy soil, is filled in the cofferdam body 1 after dry water is pumped in the cofferdam body 1, and the top surface of the backfill soil 2 is higher than the water surface;
the foundation reinforcement 3 is a reinforcing pile arranged in the backfill 2 in the cofferdam 1 to form a composite foundation of the construction platform; the distance between the reinforcing piles in the water area part is unchanged, the pile distance between the reinforcing piles in the land area part is gradually increased from the waterside side of the land area to the inland direction, and the pile length of the reinforcing piles is gradually reduced from the water area side to the land area side; the reinforcing pile adopts a cement mixing pile, a CFG pile, a sand pile or a gravel pile;
the platform surface layer comprises a gravel cushion layer 41 and a concrete surface layer 42 which are sequentially paved on the top surface of the composite foundation of the construction platform; the thickness of the gravel cushion layer 41 is 5 cm-10 cm; the concrete face 42 is 20cm thick.
In one embodiment, the plane of the cofferdam body 1 is a circle with the diameter of 40m, one half of the cofferdam body 1 is positioned in a water area, the other half of the cofferdam body 1 is positioned in a land area, and the central axis of the cofferdam body 1 is positioned at the waterside edge of the land area; the cofferdam body 1 is formed by connecting 100 fore shaft steel pipe piles, the outer diameter of a steel pipe pile body 10 in the fore shaft steel pipe pile is phi 1000mm, and the wall thickness is 12 mm; the male locking notch 11 is I-shaped steel with the model I22a, and a wing plate at one end of the I-shaped steel is welded on the outer surface of the steel pipe pile 10 through two round steel with the diameter of phi 6 mm; the female locking notch is an open steel pipe with the diameter of phi 159mm and the wall thickness of 10mm, and the open steel pipe is also welded on the outer surface of the steel pipe pile 10 through two round steel with the diameter of phi 6 mm; the foundation reinforcement 3 adopts cement mixing piles with the pile diameter of 500mm, the cement mixing piles are arranged in a square shape, and the pile spacing gradually increases from the central axis of the cofferdam 1 to the land side direction and is respectively 0.9m, 1.0m, 1.2m, 1.4m and 1.6 m;
the utility model relates to a bank segment cofferdam construction platform reinforced by a variable replacement rate composite foundation, which comprises the following steps during construction:
firstly, processing and manufacturing a lock catch pile in advance, wherein the process comprises welding a female lock opening and a male lock opening and lengthening a steel pipe pile;
step two, constructing the locking steel pipe piles, wherein 100t of crane ships matched with a vibration hammer with the model of APE200-6 are selected as piling machinery for the locking steel pipe piles of the water area part to be constructed, and the construction sequence is that the locking steel pipe piles of the water area part are constructed one by one along the arc direction from one side until all the locking steel pipe piles of the water area part are completely constructed; the fore shaft steel pipe pile of the land part adopts a 120t crawler crane matched with a vibratory hammer with the model of APE200-6 as a piling machine; readjusting the pile positions of the last 10 fore-lock steel pipe piles before the closing of the cofferdam body 1 according to the deviation of the piles and the concrete positions of the piles to ensure that the lock steel pipe piles are smoothly closed;
thirdly, after the cofferdam body construction is finished, pumping water in the cofferdam body and constructing the backfill 2, wherein the backfill 2 selects sandy soil with better mechanical property as much as possible, and the backfill 2 adopts layered filling and is leveled after being filled to a preset height;
reinforcing the backfill soil layer by adopting cement mixing piles on the ground after backfilling, wherein the pile diameter of each cement mixing pile is 0.5m, and the drilling speed of guniting is 0.8-1.0 m/min; the lifting speed is 0.8-1.0 m/min; the stirring revolution is more than or equal to 70 revolutions per minute; the sinking guniting pressure is 0.25-0.40 Mpa.
And step five, after the construction of the cement mixing pile is finished, finishing the site of the composite foundation by mutually matching a bulldozer, a loader, an excavator and manpower, and then constructing the surface layer of the platform, namely paving a gravel cushion layer 41 with the thickness of 5 cm-10 cm, and then hardening the surface layer, namely pouring a C20 concrete surface layer 42.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (5)
1. A bank segment cofferdam construction platform for reinforcing a variable replacement rate composite foundation comprises a cofferdam body, backfill, a foundation reinforcement and a platform surface layer; it is characterized in that the preparation method is characterized in that,
the cofferdam body is formed by mutually connecting a plurality of lock catch steel pipe piles, the plane of the cofferdam body is circular or rectangular, and one part of the cofferdam body is positioned in the water area;
the backfill soil is filled in the cofferdam body after being drained, and the top surface of the backfill soil is higher than the water surface;
the foundation reinforcement is a reinforcing pile arranged in backfill soil in the cofferdam body to form a composite foundation of the construction platform; the pile spacing of the reinforcing piles is gradually increased from the water-facing edge of the land area to the land area side, and the pile length is gradually decreased from the water area side to the land area side;
the platform surface layer comprises a gravel cushion layer and a concrete surface layer which are sequentially paved on the top surface of the composite foundation of the construction platform.
2. The variable-replacement-rate composite foundation-reinforced riverbank section cofferdam construction platform as claimed in claim 1, wherein the hasp steel pipe pile is composed of a steel pipe pile body and a male locking notch and a female locking notch welded on the steel pipe pile body, the male locking notch is an I-shaped steel, the female locking notch is an open steel pipe with a diameter smaller than that of the steel pipe pile body, and the male locking notch and the female locking notch are arranged at 180 degrees along the outer surface of the steel pipe pile body.
3. The variable-replacement-rate composite foundation-reinforced riverbank section cofferdam construction platform as claimed in claim 1, wherein the backfill soil is sandy soil.
4. The variable-replacement-rate composite foundation-reinforced riverbank-section cofferdam construction platform of claim 1, wherein the reinforcing piles adopt cement mixing piles, CFG piles, sand piles or gravel piles.
5. The variable-replacement-rate composite foundation-reinforced riverbank section cofferdam construction platform as recited in claim 1, wherein the thickness of the gravel cushion layer is 5 cm-10 cm; the thickness of the concrete surface layer is 20 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122313444.9U CN216075194U (en) | 2021-09-23 | 2021-09-23 | Bank segment cofferdam construction platform for variable replacement rate composite foundation stabilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122313444.9U CN216075194U (en) | 2021-09-23 | 2021-09-23 | Bank segment cofferdam construction platform for variable replacement rate composite foundation stabilization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216075194U true CN216075194U (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122313444.9U Active CN216075194U (en) | 2021-09-23 | 2021-09-23 | Bank segment cofferdam construction platform for variable replacement rate composite foundation stabilization |
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| Country | Link |
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| CN (1) | CN216075194U (en) |
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2021
- 2021-09-23 CN CN202122313444.9U patent/CN216075194U/en active Active
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