CN111851540A - High-rigidity anti-seepage combined cofferdam and construction method thereof - Google Patents
High-rigidity anti-seepage combined cofferdam and construction method thereof Download PDFInfo
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- CN111851540A CN111851540A CN202010644045.8A CN202010644045A CN111851540A CN 111851540 A CN111851540 A CN 111851540A CN 202010644045 A CN202010644045 A CN 202010644045A CN 111851540 A CN111851540 A CN 111851540A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a high-rigidity anti-seepage combined cofferdam and a construction method thereof, wherein the manufactured cofferdam comprises two steel sheet piles which are oppositely arranged, steel pull rods for oppositely pulling the two steel sheet piles and sub-piles which are arranged for the steel sheet piles in a foundation pit; bagged miscellaneous filling soil is filled between the two steel sheet piles, and the bagged miscellaneous filling soil is filled to the pile tops of the steel sheet piles; a mud stone road surface is paved on the bagged miscellaneous filling soil, a cement rotary spraying pile meshed with each other is arranged along the mud stone road surface close to the outer side of the foundation pit, and the cement rotary spraying pile is used for being inserted into the foundation silty clay layer; filling bagged miscellaneous filler soil as a sub-weir on the top of the cement rotary jet grouting pile close to the outer side of the foundation pit, and spreading a geomembrane on the side close to the water of the sub-weir; the invention has moderate cost, smaller section, larger rigidity and better anti-seepage performance, and is suitable for the foundation with larger water depth, softer foundation and strong permeable foundation.
Description
Technical Field
The invention relates to the field of hydraulic engineering, in particular to a high-rigidity anti-seepage combined cofferdam and a construction method thereof.
Background
Before the construction of wading engineering, a cofferdam is generally required to be filled, and common cofferdams comprise an earth-rock cofferdam and a steel sheet pile cofferdam. The earth-rock cofferdam has lower cost, larger section and longer construction period. The steel sheet pile cofferdam is constructed quickly, but for a deep water and a soft soil foundation, the deformation is too large, and the instability risk exists.
The current techniques are as follows: adopt the counter-pulling steel sheet pile, fill cohesive soil or hydraulic fill sand in the stake, but when the foundation has darker silt and the sand bed that permeates water by force, be difficult to cut off the layer that permeates water by force, cause the foundation ditch to gush water too much, influence main part engineering construction safety even.
Disclosure of Invention
The invention aims to provide a high-rigidity anti-seepage combined cofferdam and a construction method thereof, and aims to solve the problem of low safety coefficient of the existing cofferdam construction.
In order to solve the technical problem, the invention provides a construction method of a high-rigidity anti-seepage combined cofferdam, which comprises the following steps,
step S1, two steel sheet piles which are oppositely arranged are arranged at a construction position, the lower parts of the steel sheet piles are inserted below the beach ground, and the two steel sheet piles are oppositely pulled by using steel pull rods;
step S2, filling bagged miscellaneous filler soil between two steel sheet piles until the bagged miscellaneous filler soil is filled to the pile top of the steel sheet pile, so as to extrude the water body between the two steel sheet piles;
step S3, after the settlement is basically stable, paving a layer of mud stone road surface on the bagged miscellaneous filling soil;
step S4, arranging a cement rotary-spraying pile which is mutually occluded along the mud stone road surface close to the outer side of the foundation pit, wherein the cement rotary-spraying pile is inserted into the foundation silty clay layer;
Step S5, piling the bagged miscellaneous fill soil as a sub weir on the top of the cement jet grouting pile close to the outer side of the foundation pit;
step S6, spreading a geomembrane on the water side of the sub weir, and then pressing the surface of the geomembrane by using the bagged miscellaneous fill;
and S7, draining water bodies in the foundation pit, excavating the foundation pit to a set depth, and constructing a sub-pile for the steel sheet pile.
In one embodiment, in step S1, a horizontally arranged steel wale is disposed at an outer edge of the steel sheet pile, and the steel tie rod passes through the steel wale to pull the two steel sheet piles oppositely.
In one embodiment, in step S5, the sub-weir has a trapezoidal cross section.
In one embodiment, in step S7, the sub-pile is a pine pile.
In one embodiment, in step S7, the pine pile is constructed as a sub-pile of the steel sheet pile at a distance of 3m to 6m from the steel sheet pile.
In order to solve the technical problem, the invention also provides a high-rigidity anti-seepage combined cofferdam which is manufactured by applying the construction method and comprises two steel sheet piles which are oppositely arranged, the steel pull rods which pull the two steel sheet piles oppositely, and sub-piles which are arranged for the steel sheet piles in a foundation pit; the bagged miscellaneous filling soil is filled between two steel sheet piles, and the bagged miscellaneous filling soil is filled to the pile tops of the steel sheet piles; the mud stone pavement is paved on the bagged miscellaneous filling soil, the cement rotary jet grouting piles which are mutually occluded are arranged along the mud stone pavement close to the outer side of the foundation pit, and the cement rotary jet grouting piles are used for being inserted into the foundation silty clay layer; and the bagged miscellaneous filling soil is filled at the top of the cement jet grouting pile close to the outer side of the foundation pit and serves as a sub-weir, and a geomembrane is laid on the side close to the water of the sub-weir.
In one embodiment, the outer edge of the steel sheet pile is provided with a horizontally arranged steel wale, and the steel pull rod penetrates through the steel wale to oppositely pull the two steel sheet piles.
In one embodiment, the sub-weir has a trapezoidal cross section.
In one embodiment, the sub-pile is a pine pile.
In one embodiment, the pine pile is arranged at a distance of 3-6 m from the steel sheet pile.
The invention has the following beneficial effects:
1. because the cement rotary-spraying piles which are mutually occluded are arranged along the mud stone road surface and close to the outer side of the foundation pit and are inserted into the foundation silty clay layer, the impermeability of the inner steel sheet pile, the outer steel sheet pile and the middle cement rotary-spraying pile are greatly improved.
2. And filling bagged miscellaneous filler soil between two steel sheet piles until the bagged miscellaneous filler soil is filled to the pile top of the steel sheet pile, wherein the top of the cement jet grouting pile is close to the outer side of the foundation pit, and the bagged miscellaneous filler soil is filled to serve as a sub weir.
3. And (3) draining water bodies in the foundation pit, excavating the foundation pit to a set depth, and constructing a sub-pile for the steel sheet pile, so that the stability of the side slope on the inner side of the foundation pit can be improved, and the overall rigidity of the cofferdam can be improved.
The invention has moderate cost, smaller section, larger rigidity and better anti-seepage performance, and is suitable for the foundation with larger water depth, softer foundation and strong permeable foundation.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram in a top view provided by an embodiment of the high-rigidity impermeable combined cofferdam of the present invention;
fig. 2 is a schematic sectional view taken along line a-a of fig. 1.
The reference numbers are as follows:
10. steel sheet piles; 20. cement rotary jet grouting piles; 30. pine piles; 50. a geomembrane; 60. mud stone pavements; 70. a steel wale; 80. a steel pull rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a construction method of a high-rigidity anti-seepage combined cofferdam, as shown in figures 1 and 2, the embodiment of the invention comprises the following steps,
Step S1, two steel sheet piles 10 which are oppositely arranged are arranged at a construction position, the lower parts of the steel sheet piles 10 are inserted below the beach ground, and the two steel sheet piles 10 are oppositely pulled by using steel pull rods 80; at this time, a steel wale 70 which is horizontally arranged can be arranged on the outer edge of the steel sheet pile 10, and the steel pull rod 80 penetrates through the steel wale 70 to oppositely pull the two steel sheet piles 10, so that the opposite pulling effect is enhanced;
step S2, filling bagged miscellaneous filler soil 40 between the two steel sheet piles 10 until the bagged miscellaneous filler soil 40 is filled to the pile top of the steel sheet pile 10, so as to extrude the water body between the two steel sheet piles 10;
step S3, after the settlement is basically stable, paving a layer of mud stone road surface 60 on the bagged miscellaneous fill 40;
step S4, arranging a cement rotary spraying pile 20 which is mutually occluded along the mud stone road surface 60 and close to the outer side of the foundation pit, and inserting the cement rotary spraying pile 20 into the foundation silty clay layer;
step S5, filling bagged miscellaneous fill 40 as a sub weir on the top of the cement jet grouting pile 20 close to the outer side of the foundation pit; preferably, the sub-weir can be arranged to have a trapezoidal section;
step S6, spreading a geomembrane 50 on the water side of the sub-weir, and then pressing the surface of the geomembrane 50 by using bagged miscellaneous fill 40;
step S7, draining water bodies in the foundation pit, excavating the foundation pit to a set depth, and constructing a sub-pile for the steel sheet pile 10; preferably, the sub-pile is a pine pile 30, and the pine pile 30 is constructed as the sub-pile of the steel sheet pile 10 at a distance of 3m to 6m from the steel sheet pile 10.
For example, a water intake of a water plant is positioned on the riverway beach, lithology is composed of silt soft soil with the thickness of 4.5m, strong permeable sand layer with the thickness of 5.7m, silty clay with the thickness of 4.2m and bedrock from top to bottom, the water depth corresponding to the designed water level in 5 years in the construction period is 5m, the designed excavation depth of a foundation pit is 6m, the base part of a cofferdam is positioned in the strong permeable sand layer, and a cofferdam needs to be arranged before construction.
Firstly, constructing an inner steel sheet pile 10 and an outer steel sheet pile 10 at a cofferdam design position, wherein the length of the inner steel sheet pile is 18m, the distance between the beach ground and the beach ground is 6m, the distance between the beach ground and the lower beach ground is 12m, horizontally arranging a steel waist beam 70 at the outer edge of the steel sheet pile 10, and oppositely pulling by using a steel pull rod 80; and filling bagged miscellaneous filling soil 40 into the cavity between the two steel sheet piles 10, gradually extruding the water body in the cavity until the water body is thrown and filled to the top of the steel sheet piles 10, and paving a layer of mud stone pavement 60cm thick after the settlement is basically stable.
Then, a cement rotary spraying pile 20 which is mutually occluded is arranged along the mud stone pavement 60 and close to the outer side of the foundation pit, the diameter of the cement rotary spraying pile 20 is 60cm, the distance between the cement rotary spraying piles is 50cm, and the pile bottom of the cement rotary spraying pile 20 enters the foundation silty clay layer by 1.8 m. And (3) stacking bagged miscellaneous filler 40 as a sub-weir at the top of the jet grouting pile close to the outer side of the foundation pit, wherein the sub-weir has a trapezoidal section, and pressing the surface with the bagged miscellaneous filler 40 after spreading a geomembrane 50 at the side close to water.
And finally, pumping water existing in the foundation pit, constructing a pine pile 30 at a position 4m away from the steel sheet pile 10 when the foundation pit is excavated to 3m deep to serve as a sub-pile of the cofferdam steel sheet pile 10, wherein the pine pile 30 is 7m long and 20cm in diameter, the pile end of the pine pile 30 enters 4m below the design surface of the foundation pit, and excavating the foundation pit to the design elevation, thereby completing the engineering construction in the foundation pit and obtaining good implementation effect.
The construction method at least has the following beneficial effects:
1. because a cement rotary spraying pile 20 which is mutually occluded is arranged along the mud stone pavement 60 and close to the outer side of the foundation pit, and the cement rotary spraying pile 20 is inserted into the foundation silty clay layer, the anti-permeability performance is greatly improved by the inner and outer steel sheet piles 10 and the middle cement rotary spraying pile 20.
2. Because the top of the cement jet grouting pile 20 is close to the outer side of the foundation pit, the filling bag is filled with miscellaneous filling soil 40 to serve as a sub weir, and the sub weir is of a trapezoidal section, the lengths of the steel sheet pile 10 and the jet grouting pile are reduced, and the construction period and the investment are saved.
3. And filling bagged miscellaneous filler soil 40 between two steel sheet piles 10 until the bagged miscellaneous filler soil 40 is filled to the pile top of the steel sheet pile 10, filling the bagged miscellaneous filler soil 40 to be used as a sub weir at the top of the cement jet grouting pile 20 close to the outer side of the foundation pit, fully utilizing the miscellaneous filler soil, and using the braided bag only.
4. And (3) draining water bodies in the foundation pit, excavating the foundation pit to a set depth, and constructing a sub-pile for the steel sheet pile 10, so that the stability of the side slope on the inner side of the foundation pit can be improved, and the overall rigidity of the cofferdam can be improved.
The invention has moderate cost, smaller section, larger rigidity and better anti-seepage performance, and is suitable for the foundation with larger water depth, softer foundation and strong permeable foundation.
The invention also provides a high-rigidity anti-seepage combined cofferdam which is manufactured by applying the construction method, and the embodiment of the cofferdam is shown in figures 1 and 2, and comprises two steel sheet piles 10 which are oppositely arranged, steel pull rods 80 for oppositely pulling the two steel sheet piles 10 and sub-piles which are arranged for the steel sheet piles 10 in a foundation pit; bagged miscellaneous fill 40 is filled between the two steel sheet piles 10 in a stacking manner, and the bagged miscellaneous fill 40 is filled to the pile top of the steel sheet pile 10 in a stacking manner; a mud stone road surface 60 is paved on the bagged miscellaneous filling soil 40, a mutually occluded cement rotary jet grouting pile 20 is arranged along the mud stone road surface 60 and close to the outer side of the foundation pit, and the cement rotary jet grouting pile 20 is used for being inserted into a foundation silty clay layer; and (3) filling bagged miscellaneous filler 40 serving as a sub-weir on the top of the cement jet grouting pile 20 close to the outer side of the foundation pit, and spreading a geomembrane 50 on the side close to the water of the sub-weir.
In order to enhance the opposite pulling effect, in this embodiment, a horizontally arranged steel wale 70 is disposed at the outer edge of the steel sheet pile 10, and the steel pull rod 80 passes through the steel wale 70 to pull the two steel sheet piles 10 in opposite directions.
In order to reduce the lengths of the steel sheet pile 10 and the jet grouting pile and save the construction period and investment, the sub-weir is arranged in the embodiment and has a trapezoidal section.
Furthermore, in order to increase the stability of the side slope on the inner side of the foundation pit and the overall rigidity of the cofferdam, the sub-piles are pine piles 30, and the pine piles 30 are arranged at a distance of 3-6 m from the steel sheet piles 10.
The beneficial effects can be obtained after the high-rigidity anti-seepage combined cofferdam is constructed and manufactured by the method, so the method is not described.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A construction method of a high-rigidity anti-seepage combined cofferdam is characterized by comprising the following steps,
step S1, two steel sheet piles which are oppositely arranged are arranged at a construction position, the lower parts of the steel sheet piles are inserted below the beach ground, and the two steel sheet piles are oppositely pulled by using steel pull rods;
Step S2, filling bagged miscellaneous filler soil between two steel sheet piles until the bagged miscellaneous filler soil is filled to the pile top of the steel sheet pile, so as to extrude the water body between the two steel sheet piles;
step S3, after the settlement is basically stable, paving a layer of mud stone road surface on the bagged miscellaneous filling soil;
step S4, arranging a cement rotary-spraying pile which is mutually occluded along the mud stone road surface close to the outer side of the foundation pit, wherein the cement rotary-spraying pile is inserted into the foundation silty clay layer;
step S5, piling the bagged miscellaneous fill soil as a sub weir on the top of the cement jet grouting pile close to the outer side of the foundation pit;
step S6, spreading a geomembrane on the water side of the sub weir, and then pressing the surface of the geomembrane by using the bagged miscellaneous fill;
and S7, draining water bodies in the foundation pit, excavating the foundation pit to a set depth, and constructing a sub-pile for the steel sheet pile.
2. The construction method according to claim 1, wherein in step S1, a horizontally arranged steel wale is disposed at an outer edge of the steel sheet pile, and the steel tie bar is passed through the steel wale to pull the two steel sheet piles oppositely.
3. The construction method according to claim 1, wherein the sub-weir has a trapezoidal cross section in step S5.
4. The construction method according to claim 1, wherein in step S7, the sub-pile is a pine pile.
5. The construction method according to claim 4, wherein the pine pile is constructed as a sub-pile of the steel sheet pile at a distance of 3 to 6m from the steel sheet pile in step S7.
6. A high-rigidity anti-seepage combined cofferdam is characterized in that,
the construction method comprises the steps of arranging the steel sheet piles oppositely, drawing the steel pull rods oppositely for the two steel sheet piles, and arranging the sub-piles for the steel sheet piles in a foundation pit;
the bagged miscellaneous filling soil is filled between two steel sheet piles, and the bagged miscellaneous filling soil is filled to the pile tops of the steel sheet piles;
the mud stone pavement is paved on the bagged miscellaneous filling soil, the cement rotary jet grouting piles which are mutually occluded are arranged along the mud stone pavement close to the outer side of the foundation pit, and the cement rotary jet grouting piles are used for being inserted into the foundation silty clay layer;
and the bagged miscellaneous filling soil is filled at the top of the cement jet grouting pile close to the outer side of the foundation pit and serves as a sub-weir, and a geomembrane is laid on the side close to the water of the sub-weir.
7. The high-rigidity impermeable combined cofferdam of claim 5, wherein the outer edge of the steel sheet pile is provided with a horizontally arranged steel wale, and the steel pull rod passes through the steel wale to pull the two steel sheet piles oppositely.
8. The high-rigidity impermeable combined cofferdam of claim 5, wherein said sub-weir is of trapezoidal section.
9. The high-rigidity impermeable combined cofferdam of claim 5, wherein said sub-piles are pine piles.
10. The high-rigidity impermeable combined cofferdam of claim 9, wherein the pine piles are placed at a distance of 3-6 m from the steel sheet piles.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010644045.8A CN111851540A (en) | 2020-07-07 | 2020-07-07 | High-rigidity anti-seepage combined cofferdam and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010644045.8A CN111851540A (en) | 2020-07-07 | 2020-07-07 | High-rigidity anti-seepage combined cofferdam and construction method thereof |
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| CN111851540A true CN111851540A (en) | 2020-10-30 |
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Citations (6)
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|---|---|---|---|---|
| JPH06220865A (en) * | 1993-01-27 | 1994-08-09 | Shimizu Corp | Double cofferdam process |
| CN103669375A (en) * | 2013-12-27 | 2014-03-26 | 张安政 | Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof |
| CN103924602A (en) * | 2014-04-30 | 2014-07-16 | 冯诚 | Deep soft soil foundation pit construction method |
| CN203939036U (en) * | 2014-06-05 | 2014-11-12 | 广州宏伟工程承包有限公司 | A kind of steel sheet pile cofferdam structure that is applicable to river course |
| CN204551500U (en) * | 2015-03-23 | 2015-08-12 | 中建三局集团有限公司 | Novel cofferdam in a kind of super thick soft foundation |
| CN208650073U (en) * | 2018-08-06 | 2019-03-26 | 合肥市市政设计研究总院有限公司 | Cut and cover method subaqueous tunnel steel sheet-pile cofferdam construction |
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2020
- 2020-07-07 CN CN202010644045.8A patent/CN111851540A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06220865A (en) * | 1993-01-27 | 1994-08-09 | Shimizu Corp | Double cofferdam process |
| CN103669375A (en) * | 2013-12-27 | 2014-03-26 | 张安政 | Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof |
| CN103924602A (en) * | 2014-04-30 | 2014-07-16 | 冯诚 | Deep soft soil foundation pit construction method |
| CN203939036U (en) * | 2014-06-05 | 2014-11-12 | 广州宏伟工程承包有限公司 | A kind of steel sheet pile cofferdam structure that is applicable to river course |
| CN204551500U (en) * | 2015-03-23 | 2015-08-12 | 中建三局集团有限公司 | Novel cofferdam in a kind of super thick soft foundation |
| CN208650073U (en) * | 2018-08-06 | 2019-03-26 | 合肥市市政设计研究总院有限公司 | Cut and cover method subaqueous tunnel steel sheet-pile cofferdam construction |
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| Title |
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| 柯昌春等: "《东湖水下城市隧道关键技术实践与创新》", 31 August 2018 * |
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Application publication date: 20201030 |