CN213836700U

CN213836700U - Combined cofferdam applicable to deep and thick silt layer of tidal river

Info

Publication number: CN213836700U
Application number: CN202022616249.9U
Authority: CN
Inventors: 唐芳; 秦树章; 张为称; 郭立虹; 窦桂华; 史小飞
Original assignee: Lingnan Water Group Co ltd
Current assignee: Lingnan Water Group Co ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-07-30
Anticipated expiration: 2030-11-12

Abstract

The utility model relates to a combination cofferdam suitable for on morning and evening tides river deep silt layer, including throwing sand weir basic unit, two-way geogrid layer, it sets up in silt layer top to throw sand weir basic unit, two-way geogrid layer sets up throw sand weir basic unit top, be provided with jumbo size membrane bag sand bed on the geogrid layer, be provided with clay weir body on the jumbo size membrane bag sand bed, clay weir body both sides are provided with membrane bag sand bed. The beneficial effects are as follows: the combined cofferdam is formed by large-size membrane bag sand and a clay core wall, a sand cushion layer and a geogrid are paved on a weir base, membrane bag sand back-pressure platforms are arranged on two sides of a weir body, clay is backfilled in the middle of the weir body, a membrane bag sand slope protection is arranged on a water-facing slope, and bamboo strips or geogrids are arranged to reinforce the overall rigidity of the cofferdam during cofferdam filling, so that the combined cofferdam has good integrity, seepage-proofing and impact-proofing functions and deformation coordination capability.

Description

Combined cofferdam applicable to deep and thick silt layer of tidal river

Technical Field

The utility model relates to a hydraulic engineering construction field, in particular to combination cofferdam suitable for on the morning and evening tides river deep silt layer.

Background

With the development of times, river crossing and inland shallow water lake region crossing are more common in the process of building hydraulic engineering, and particularly, the river crossing and inland shallow water silt lake region crossing is more. Before construction, a temporary cofferdam is usually constructed. At the intersection of two rivers, the water level is greatly influenced by tide, the river bottom silt soil layer is thick, if a traditional earth cofferdam is filled on the river bottom silt soil layer, the earth is easy to dissipate, and the closure difficulty of the earth dam is large; if the steel sheet pile cofferdam is adopted, the steel sheet pile needs to be arranged too long due to the thick sludge layer, and the cofferdam is not economical.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's not enough, provide a combination cofferdam that is applicable to on the morning and evening tides river deep silt layer that construction is simple, cofferdam non-deformable, prevention of seepage scour protection.

The utility model provides a combination cofferdam suitable for on morning and evening tides river deep silt layer, its technical scheme is:

the utility model provides a combination cofferdam suitable for on morning and evening tides river deep silt layer, includes sand throwing weir basic unit, two-way geogrid layer, sand throwing weir basic unit sets up in silt layer top, two-way geogrid layer sets up sand throwing weir basic unit top, be provided with jumbo size membrane bag sand bed on the geogrid layer, be provided with clay weir body on the jumbo size membrane bag sand bed, clay weir body both sides are provided with the back pressure platform.

Preferably, bamboo strips or geogrids are used for reinforcement when the cofferdam weir body is filled.

Preferably, the geogrid layer extends out of the two side weir feet by more than 2 m.

Preferably, the thickness of the sand slinger base layer is more than 1 m.

Preferably, the thickness of the film bag constituting the large-sized film bag sand layer is more than 500 mm.

Preferably, the water-facing slope of the cofferdam is provided with a film bag sand slope protection.

Preferably, the thickness of the membrane bag sand slope protection is more than 500 mm.

Preferably, the membrane bag sand slope protection thickness comprises a geotextile layer and a sandstone cushion layer.

Preferably, 250g/m is adopted as the geotextile layer²The geotextile of (1); the thickness of the gravel cushion layer is 300 mm.

The utility model discloses an implement including following technological effect:

the utility model discloses a combination cofferdam suitable for on morning and evening tides river deep silt layer, the combination cofferdam of jumbo size membrane bag sand with clay core wall has been adopted to the novelty, weir base sanding bed course and geogrid, membrane bag sand back pressure platform is established to weir body both sides, weir body middle part adopts the clay to backfill, the membrane bag sand bank protection is established to the slope of meeting water, establish bamboo strip or geogrid when the cofferdam is filled and add the bulk rigidity that increases the cofferdam, make the combination cofferdam have good wholeness, prevention of seepage scour protection function and deformation coordination ability.

The utility model discloses a cofferdam utilizes sand bed course and geogrid to weaken the differential settlement of soft soil foundation greatly, combine the membrane bag cofferdam to the deformation that the soft soil foundation produced with subside strong adaptability's characteristics, and add the holistic rigidity that increases the cofferdam through bamboo splint or geogrid in weir body membrane bag and clay core wall, it leads to the membrane bag to be broken from bottom to top in proper order owing to the differential settlement of foundation to have solved and has built the membrane bag cofferdam on the soft soil foundation, cause the difficult problem that the weir body warp the unstability, the safe operation of weir body has been guaranteed.

Drawings

Fig. 1 is a schematic view of a sectional structure of a combined cofferdam applied to a deep silt layer of a tidal river (external river).

Fig. 2 is a schematic view of the sectional structure of the combined cofferdam applied to the deep silt layer of the tidal river (inland river) of the embodiment of the utility model.

In the figure: 1. a sand throwing weir base layer; 2. a bi-directional geogrid layer; 3. a large-size film bag sand layer; 4. a clay weir body; 5. a back pressure platform; 6. protecting slope with film bag sand; 60. a geotextile layer; 61. a sandstone cushion layer; 7. and (4) settling a line.

Detailed Description

The present invention will be described in detail with reference to the following embodiments and the accompanying drawings, wherein the described embodiments are only intended to facilitate the understanding of the present invention, and do not limit the present invention in any way.

Referring to fig. 1, the combined cofferdam applicable to the deep silt layer of the tidal river provided by the embodiment comprises a sand-throwing weir base layer 1 and a bidirectional geogrid layer 2, wherein the sand-throwing weir base layer 1 is arranged above the silt layer, the bidirectional geogrid layer 2 is arranged above the sand-throwing weir base layer 1, a large-size membrane bag sand layer 3 is arranged on the geogrid layer, a clay weir body 4 is arranged on the large-size membrane bag sand layer 3, and back pressure platforms are arranged on two sides of the clay weir body 4. When the cofferdam is filled, bamboo strips or geogrids are arranged for reinforcing. Specifically, the geogrid layer extends out of the two sides of the weir feet by more than 2 m. The thickness of the sand-throwing weir base layer 1 is more than 1 m. The film bag constituting the large-size counter-pressure platform 3 is 500mm thick. The upstream slope of cofferdam establishes membrane bag sand bank protection 6, and membrane bag sand bank protection 6 is 500mm thick. Referring to fig. 2, when a cofferdam is built in an inland river, the membrane bag sand slope protection 6 comprises a geotextile layer 60 and a sandstone cushion layer 61; the geotextile layer 60 adopts 250g/m²The geotextile of (1); the sandstone pad 61 is 300mm thick.

The utility model discloses an embodiment, cofferdam overall length is about 240m, and the weir base adopts and throws sand filling 2m thick, and the two-way geogrid of one deck is laid again to full, stretches out both sides weir foot 2 m. The weir body is provided with a back pressure platform 5 formed by membrane bag sand, the back pressure platform is filled with the membrane bag sand, and the weir body is backfilled with cohesive soil. The mold bag sand slope protection is arranged on the upstream slope of the inner surrounding weir to be 500mm thick, and the riprap slope protection is arranged on the upstream slope of the outer surrounding weir to be 600mm thick.

The utility model discloses the combination cofferdam of jumbo size membrane bag sand and clay core wall has been adopted to novelty, weir base sanding bed course and geogrid, and membrane bag sand back pressure platform is established to weir body both sides, and weir body middle part adopts the clay to backfill, and membrane bag sand bank protection 6 is established to the upstream slope, establishes bamboo strip or geogrid when the cofferdam is filled and adds the integral rigidity that increases the cofferdam, and settlement line 7 generally is less than 1m, makes the combination cofferdam have good wholeness, prevention of seepage scour protection function and deformation coordination ability.

It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A combined cofferdam applicable to a tidal and river deep silt layer is characterized in that: including throwing sand weir basic unit, two-way geogrid layer, throwing sand weir basic unit sets up in silt layer top, two-way geogrid layer sets up throwing sand weir basic unit top, be provided with jumbo size membrane bag sand layer on the geogrid layer, be provided with the clay weir body on the jumbo size membrane bag sand layer, clay weir body both sides are provided with the back pressure platform.

2. The combined cofferdam applied to the deep sludge layer of tidal rivers according to claim 1, wherein: when the cofferdam weir body is filled, bamboo strips or geogrids are arranged for reinforcing.

3. The combined cofferdam applied to the deep sludge layer of tidal rivers according to claim 1, wherein: the geogrid layer extends out of the weir feet at two sides by more than 2 m.

4. The combined cofferdam applied to the deep sludge layer of tidal rivers according to claim 1, wherein: the thickness of the base layer of the sand slinger is more than 1 m.

5. The combined cofferdam applied to the deep sludge layer of tidal rivers according to claim 1, wherein: the thickness of the film bag forming the large-size film bag sand layer is more than 500 mm.

6. The combined cofferdam applied to the deep sludge layer of tidal rivers according to claim 1, wherein: the water-facing slope of the cofferdam is provided with a film bag sand slope protection.

7. The combined cofferdam applied to the deep sludge layer of tidal rivers according to claim 6, wherein: the thickness of the membrane bag sand slope protection is more than 500 mm.

8. The combined cofferdam applied to the deep sludge layer of tidal rivers according to claim 6, wherein: the membrane bag sand slope protection thickness comprises a geotextile layer and a sand cushion layer.

9. The combined cofferdam applied to the deep sludge layer of tidal rivers according to claim 8, wherein: the geotextile layer adopts 250g/m²The geotextile of (1); the thickness of the gravel cushion layer is 300 mm.