CN-224213341-U - Pile film bag earth-rock cofferdam suitable for high water permeability foundation

CN224213341UCN 224213341 UCN224213341 UCN 224213341UCN-224213341-U

Abstract

The utility model provides a pile film bag earth-rock cofferdam suitable for a high-water-permeability foundation, which comprises a high-strength woven bag earth-rock filling weir body, a high-strength composite geofilm bag earth-rock slope protection and impermeable covering, a geofilm impermeable inclined wall, an earth-rock filling weir body, a high-strength composite geofilm bag earth-rock slope protection, a weir top mud stone pavement, a permeable layer and the like. The upstream water facing surface adopts a double-insurance combined form of high-strength composite geomembrane bagged earth and stone impermeable paving, high-strength composite geomembrane bagged earth and stone slope protection and geomembrane impermeable inclined wall, and has good functions of water blocking, impermeable, impact resistance and frost heaving resistance. Meanwhile, the foundation adopts the steel sheet pile anti-seepage core wall, so that the problem of foundation seepage stability of the cofferdam constructed on the high-permeability foundation can be effectively solved. The utility model can be applied to various wading engineering construction scenes, and has a plurality of advantages in the aspects of guaranteeing the seepage prevention effect, ensuring the structure safety, saving the investment, shortening the construction period, protecting the environment and the like.

Inventors

LI XIAOCHAO
ZHANG CHENG
ZHANG GUOBAO
YANG HAIJUN
ZHANG JIABIN
WEN PAN
CHENG XIAOLIANG
MA YINGSHUANG

Assignees

中国电建集团北京勘测设计研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20250516

Claims (10)

1. The pile film bag earth-rock cofferdam suitable for the high-water-permeability foundation is characterized by comprising a high-strength woven bag earth-rock filling weir body (1), a high-strength composite geofilm bag earth-rock slope protection and seepage-proofing paving (2), a geofilm seepage-proofing inclined wall (4), an earth-rock filling weir body (6), a high-strength composite geofilm bag earth-rock slope protection (7), a weir top mud stone pavement (8) and a water permeable layer (9); The high-strength woven bagged earth and stone filling weir body (1) is arranged on the permeable layer (9), the upstream water facing surface of the high-strength woven bagged earth and stone filling weir body (1) and the permeable layer (9) connected with the upstream water facing surface are paved with the high-strength composite geomembrane bagged earth and stone slope protection and impermeable pavement (2), and the back water surface of the high-strength woven bagged earth and stone filling weir body (1) is paved with the geomembrane impermeable inclined wall (4); The high-strength woven bag-packed soil-stone filling weir (6) is arranged on the permeable layer (9) and positioned at the downstream of the high-strength woven bag-packed soil-stone filling weir (1), one surface of the soil-stone filling weir (6) is connected with the geomembrane impermeable inclined wall (4), the weir top of the soil-stone filling weir (6) is higher than that of the high-strength woven bag-packed soil-stone filling weir (1), the soil-stone filling weir (6) is provided with an upstream water-facing surface connected with the upstream water-facing surface of the high-strength woven bag-packed soil-stone filling weir (1), the high-strength composite geomembrane bag-packed soil-stone slope protection (7) is paved on the upstream water-facing surface of the soil-stone filling weir (6), and the weir top of the soil-stone filling weir (6) is provided with the top mud stone pavement (8).
2. The pile film bag earth-rock cofferdam suitable for the high water permeable foundation according to claim 1, characterized in that the high-strength woven bag earth-rock filling weir body (1) comprises a plurality of first filling units, each first filling unit adopts a staggered inverted-Y-shaped stacking mode, and the high-strength woven bag earth-rock filling weir body (1) in the form of a trapezoid section with an upstream slope ratio of 1:1-1:2.5 and a downstream slope ratio of 1:1-1:1.5 is formed by filling layer by layer.
3. The pile film bag earth-rock cofferdam suitable for the high water permeable foundation according to claim 2, wherein the first filling units comprise high-strength woven bags and first-level earth-rock filling materials filled in the high-strength woven bags, and the first filling units are connected and stacked through first modularized connecting members; The high-strength woven bag is of a three-layer structure, the outer layer is a polyester fiber or ultraviolet-resistant polypropylene material layer, the middle layer is a high-strength nylon grid reinforcing layer which is longitudinally and transversely interwoven, and the inner layer is lined with a hot-pressing composite PE impermeable film, wherein the particle size of soil and stones of the first-stage soil and stone filling material is 0.075-10 cm, and the filling density is more than or equal to 1.8g/cm < 2 >; the first modularized connecting component is a nylon binding bag or a transverse lacing wire.
4. The pile film bag earth-rock cofferdam suitable for the high-water-permeability foundation, which is characterized in that the high-strength composite geomembrane bag earth-rock revetment and seepage-proofing paving (2) comprises a high-strength composite geomembrane bag earth-rock revetment and a high-strength composite geomembrane bag seepage-proofing paving, wherein the high-strength composite geomembrane bag earth-rock revetment is paved on an upstream water facing surface of the high-strength woven bag earth-rock filling weir (1), and the high-strength composite geomembrane bag seepage-proofing paving is paved on the water-permeability layer (9).
5. The pile film bag earth-rock cofferdam suitable for the high-water permeable foundation according to claim 1, wherein the high-strength composite geomembrane bag earth-rock slope protection and seepage-proofing paving (2) comprises a plurality of second filling units, each second filling unit adopts a staggered inverted-V-shaped stacking mode of upper layers and lower layers, and the high-strength composite geomembrane bag earth-rock slope protection and seepage-proofing paving (2) in the form of parallelogram sections with the protection thickness of 1.0 m-3.0 m and the slope ratio of 1:1.5-1:2.5 is filled layer by layer.
6. The pile film bag earth-rock cofferdam suitable for high water permeable foundation of claim 5, wherein said second filling unit comprises a first high strength composite geomembrane bag and a second graded earth-rock filler filled inside said first high strength composite geomembrane bag, each of said second filling units being stacked by a second modular connecting member; The film bag body of the first high-strength composite geofilm bag is of a three-layer structure and comprises an outer high-density polyethylene HDPE impermeable layer, a middle nylon grid reinforcing layer and an LLDPE film impermeable inner layer, wherein the outer high-density polyethylene HDPE impermeable layer is coated with a polyurethane ultraviolet-resistant coating, the overall thickness is 0.8 mm-1.2 mm, the nylon grid density of the middle nylon grid reinforcing layer is 4mm multiplied by 4mm, and the thickness of the LLDPE film impermeable inner layer is 0.6mm; The particle size of the soil and stone materials of the second-stage soil and stone filling material is 0.075 mm-10 cm, and the filling density is more than or equal to 1.8g/cm < 2 >; The second modularized connecting component is a high-strength PP rope preset on two sides of the bag body, the diameter of the rope is 10mm, the length of the rope is 1/2 of the width of the bag, and the ropes are in X-shaped cross binding.
7. The pile film bag earth-rock cofferdam suitable for the high water permeable foundation according to claim 1 is characterized in that a steel sheet pile impermeable core wall (3) is arranged at the back water slope angle position of the high-strength woven bag earth-rock filling weir body (1), the top of the steel sheet pile impermeable core wall (3) is higher than the water permeable layer (9), and the bottom of the steel sheet pile impermeable core wall is embedded into the water permeable layer (9); The steel sheet pile anti-seepage core wall (3) is formed by mutually connecting U-shaped structure steel sheet pile units with the groove width of 600mm, the groove depth of 140mm and the plate thickness of 18mm through locking openings.
8. The pile film bag earth rock cofferdam suitable for the high water permeability foundation, which is disclosed by claim 7, is characterized in that the bottom of the geofilm seepage-proofing inclined wall (4) is connected with the top of the steel sheet pile seepage-proofing core wall (3) through an anchor, and the geofilm seepage-proofing inclined wall (4) is a two-cloth one-film composite geofilm with the thickness of more than or equal to 1.5cm.
9. The pile film bag earth-rock cofferdam suitable for the high water permeable foundation according to claim 1, which is characterized in that the top width of the earth-rock filling weir body (6) is more than or equal to 5m, the upstream slope ratio is 1:1-1:2.5, and the downstream slope ratio is 1:1-1:1.5; The downstream drainage rib (5) is arranged at the back surface slope angle position of the earth and stone filling weir body (6), the section form of the downstream drainage rib (5) is 2m in top width, the slope ratio of the back surface side slope is 1:1.5, and the slope ratio of the back surface side slope is 1:1.
10. The pile film bag earth-rock cofferdam suitable for the high water permeable foundation according to claim 1, characterized in that the high-strength composite geomembrane bag earth-rock revetment (7) comprises a plurality of third filling units, each third filling unit adopts a staggered inverted-Y-shaped stacking mode, and the high-strength composite geomembrane bag earth-rock revetment (7) with the protection thickness of 1.0-1.5 m and the slope ratio of 1:1.5-1:2.5 is filled layer by layer; The third filling unit comprises a second high-strength composite geomembrane bag and third-level earth and stone filling materials filled in the second high-strength composite geomembrane bag, and the third filling units are connected and stacked through a third modularized connecting member; The film bag body of the second high-strength composite geofilm bag is of a three-layer structure and comprises an outer high-density polyethylene HDPE impermeable layer, an intermediate layer which is an HDPE and 18-mesh glass fiber grid hot-pressing composite reinforcing layer and an LLDPE film impermeable inner layer, wherein the outer high-density polyethylene HDPE impermeable layer is coated with a polyurethane ultraviolet-resistant coating, the overall thickness is 0.8 mm-1.2 mm, the thickness of the HDPE and 18-mesh glass fiber grid hot-pressing composite reinforcing layer is 1.0mm, and the thickness of the LLDPE film impermeable inner layer is 0.6mm; The particle size of the soil and stone materials of the third-stage soil and stone filling material is 0.075 mm-10 cm, and the filling density is more than or equal to 1.8g/cm < 2 >; The third modularized connecting component is a high-strength PP rope preset on two sides of the bag body, the diameter of the rope is 10mm, the length of the rope is 1/2 of the width of the bag, and the rope is in X-shaped cross binding.

Description

Pile film bag earth-rock cofferdam suitable for high water permeability foundation Technical Field The utility model relates to the technical field of water conservancy and hydropower engineering, in particular to a pile film bag earth-rock cofferdam suitable for a high-permeability foundation. Background The cofferdam is a temporary water retaining building in diversion engineering and is used for enclosing a construction foundation pit, so that the permanent building can be constructed on dry land. At present, more common cofferdams can be divided into earth-rock cofferdams, concrete cofferdams, steel sheet pile cofferdams, grass-soil cofferdams, bagged soil cofferdams and the like according to the material forms used by the cofferdams, wherein the earth-rock cofferdams are widely applied. The traditional earth-rock cofferdam has the defects that the structural stability is kept by utilizing the self weight of a weir body, the body is quite large, sufficient earth-rock materials are needed to be used as filling materials, the underwater rolling construction cannot be quickly carried out in the early construction period, the engineering investment is increased, and the construction period is influenced. Especially when constructing the cofferdam on the high permeable foundation (such as sand bed, pebble layer etc.), traditional earth-rock cofferdam often leads to the seepage serious because of the foundation water permeability is high, influences the stability and the manger plate effect of cofferdam. In the prior art, the seepage prevention treatment is usually carried out by adopting a seepage prevention wall, a grouting curtain and the like, but the method has the advantages of complex construction procedures, high construction cost, long construction period and limited seepage prevention effect in the high-permeability foundation. Therefore, a cofferdam structure suitable for a high permeable foundation is needed to improve the seepage prevention effect, reduce the construction difficulty and cost and furthest reduce the adverse effect on the ecological environment caused by construction. Disclosure of utility model Aiming at the defects existing in the prior art, the utility model provides the pile film bag earth-rock cofferdam suitable for the high-water-permeability foundation, which can effectively solve the problems. The technical scheme adopted by the utility model is as follows: The utility model provides a pile film bag earth-rock cofferdam suitable for a high-water-permeability foundation, which comprises a high-strength woven bag-filled earth-rock filling weir body (1), a high-strength composite geofilm bag-filled earth-rock slope protection and impermeable paving (2), a geofilm impermeable inclined wall (4), an earth-rock filling weir body (6), a high-strength composite geofilm bag-filled earth-rock slope protection (7), a weir top mud-stone pavement (8) and a permeable layer (9); The high-strength woven bagged earth and stone filling weir body (1) is arranged on the permeable layer (9), the upstream water facing surface of the high-strength woven bagged earth and stone filling weir body (1) and the permeable layer (9) connected with the upstream water facing surface are paved with the high-strength composite geomembrane bagged earth and stone slope protection and impermeable pavement (2), and the back water surface of the high-strength woven bagged earth and stone filling weir body (1) is paved with the geomembrane impermeable inclined wall (4); The high-strength woven bag-packed soil-stone filling weir (6) is arranged on the permeable layer (9) and positioned at the downstream of the high-strength woven bag-packed soil-stone filling weir (1), one surface of the soil-stone filling weir (6) is connected with the geomembrane impermeable inclined wall (4), the weir top of the soil-stone filling weir (6) is higher than that of the high-strength woven bag-packed soil-stone filling weir (1), the soil-stone filling weir (6) is provided with an upstream water-facing surface connected with the upstream water-facing surface of the high-strength woven bag-packed soil-stone filling weir (1), the high-strength composite geomembrane bag-packed soil-stone slope protection (7) is paved on the upstream water-facing surface of the soil-stone filling weir (6), and the weir top of the soil-stone filling weir (6) is provided with the top mud stone pavement (8). Preferably, the high-strength woven bagged soil and stone filling weir body (1) comprises a plurality of first filling units, each first filling unit adopts a staggered inverted-Y-shaped stacking mode, and the high-strength woven bagged soil and stone filling weir body (1) in a trapezoid section form with an upstream slope ratio of 1:1-1:2.5 and a downstream slope ratio of 1:1-1:1.5 is formed by filling layer by layer. Preferably, the first filling units comprise high-strength woven bags and first-level earth and stone filling materials filled in the hig