CN111456049B - Construction method of steel sheet pile cofferdam of water area covering-layer-free low pile cap - Google Patents

Construction method of steel sheet pile cofferdam of water area covering-layer-free low pile cap Download PDF

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Publication number
CN111456049B
CN111456049B CN202010183437.9A CN202010183437A CN111456049B CN 111456049 B CN111456049 B CN 111456049B CN 202010183437 A CN202010183437 A CN 202010183437A CN 111456049 B CN111456049 B CN 111456049B
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China
Prior art keywords
steel sheet
sheet pile
pile cofferdam
cofferdam
rock stratum
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CN202010183437.9A
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CN111456049A (en
Inventor
何明辉
胡雄伟
张臻元
刘凯
尚庆果
王青云
周超舟
胡军
侯雪青
吴迎军
王成
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China Railway Major Bridge Engineering Group Co Ltd MBEC
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China Railway Major Bridge Engineering Group Co Ltd MBEC
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/02Restraining of open water
    • E02D19/04Restraining of open water by coffer-dams, e.g. made of sheet piles
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0026Metals
    • E02D2300/0029Steel; Iron

Abstract

The invention discloses a construction method of a steel sheet pile cofferdam of a low pile cap without a covering layer in a water area, which comprises the following steps: cleaning the riverbed surface at the designed position of the steel sheet pile cofferdam; arranging a guide device at a corresponding position on the water surface according to the design position, and welding the guide device on a bracket of the steel pipe pile; the rock stratum at the designed position does not need to be milled, the steel sheet piles are inserted and beaten to the designed position along the direction of the outer wall of the guide device, and are sequentially connected end to form a steel sheet pile cofferdam; the bottom support is placed in the steel sheet pile cofferdam and is welded and fixed with the steel sheet pile cofferdam through a pull rod; sequentially placing the middle-layer inner support and the top-layer inner support into the steel sheet pile cofferdam and fixing; and (3) carrying out high-pressure grouting on the rock stratum in the steel sheet pile cofferdam by adopting grouting equipment so as to enable the rock stratum in the steel sheet pile cofferdam to be impermeable. The method fully utilizes the characteristics of the self strength and the stability of the rock stratum, and effectively reduces the design length of the steel sheet pile.

Description

Construction method of steel sheet pile cofferdam of water area covering-layer-free low pile cap
Technical Field
The invention relates to the field of bridge construction, in particular to a construction method of a steel sheet pile cofferdam of a low pile cap without a covering layer in a water area.
Background
Under the geological conditions of conventional geology and thicker covering layer, the construction difficulty of the underwater foundation is relatively small, but no covering layer exists at the position of the bridge foundation, and when the bearing platform is completely positioned in the rock stratum, after the steel pipe pile is constructed by using the drilling platform, a steel plate pile cofferdam needs to be inserted into the rock stratum, then the bearing platform is constructed, and the construction difficulty of the bearing platform under the conditions is very large. At present, for the construction of a bearing platform without a covering layer, a static pressure pile planting method or an artificial covering layer method is mostly adopted for construction.
The application of the static pressure pile planting method has the following limitations:
1) the static pressure pile planting method has higher requirements on the capability of technicians.
2) The static pressure pile planting method is low in construction speed, 2-3 steel sheet piles are planted in the static pressure pile planting method on average for projects with complex geological conditions, and the construction period is severely limited.
3) The steel sheet pile is implanted by the static pressure pile implanting method, the construction unit price is high, and the method can be only used in rock stratum geology with the rock strength less than 30 MPa.
The artificial cover method has the following disadvantages:
1) the artificial covering layer method needs to throw and fill a large amount of medium coarse sand at the designed position of the steel sheet pile cofferdam, and cannot accurately measure the throwing and filling amount due to the influence of water flow speed and water depth.
2) When the artificial covering layer method is used for constructing a low pile cap buried in a rock stratum, measures are needed to be taken to increase the lateral resistance of the inner side of the cofferdam after coarse sand in the process of throwing and filling.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a construction method of a steel sheet pile cofferdam of a low pile cap without a covering layer in a water area, which makes full use of the characteristics of the self strength and the stability of a rock stratum, does not need to take protective measures for the steel sheet pile cofferdam, and can meet the requirements by adopting the conventional construction mode of the steel sheet pile cofferdam.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a construction method of a steel sheet pile cofferdam of a low pile cap without a covering layer in a water area comprises the following steps:
cleaning the river bed surface at the design position of the steel sheet pile cofferdam so that the elevation difference of the river bed surface within the range of the steel sheet pile cofferdam is not more than 0.2 m;
arranging a guide device at a corresponding position on the water surface according to the design position, and welding the guide device on a bracket of the steel pipe pile;
inserting and beating the steel sheet piles to the design position along the outer wall direction of the guide device without milling grooves in the rock stratum at the design position, and sequentially connecting the steel sheet piles end to form the steel sheet pile cofferdam;
placing the bottom support into the steel sheet pile cofferdam, and welding and fixing the bottom support and the steel sheet pile cofferdam through a pull rod;
sequentially placing the middle-layer inner support and the top-layer inner support into the steel sheet pile cofferdam and fixing the steel sheet pile cofferdam;
and (3) adopting grouting equipment to perform high-pressure injection of cement paste or water glass slurry into the rock stratum in the range between the inner side of the steel sheet pile cofferdam and the side line of the cushion cap, so that the rock stratum in the steel sheet pile cofferdam is impermeable.
On the basis of the technical scheme, the length and the width of the steel sheet pile cofferdam are 4-8 m larger than those of the conventional steel sheet pile cofferdam.
On the basis of the technical scheme, mechanical equipment is adopted to excavate the rock stratum in the steel sheet pile cofferdam under the anhydrous condition.
On the basis of the technical scheme, the bottom layer inner support is placed in the steel sheet pile cofferdam and is welded and fixed with the steel sheet pile cofferdam through a pull rod, and the method specifically comprises the following steps:
hoisting the bottom-layer inner support into the steel sheet pile cofferdam;
and fixing the bottom layer inner support with the steel sheet pile cofferdam through a pull rod, connecting one end of the pull rod to the top end of the bottom layer inner support, and connecting the other end of the pull rod to the inner wall of the steel sheet pile cofferdam.
Compared with the prior art, the invention has the advantages that:
the construction method of the steel sheet pile cofferdam of the low pile cap without the covering layer in the water area fully utilizes the characteristics of the self strength and the stability of the rock stratum, does not need to wash the rock stratum at the design position of the steel sheet pile cofferdam, carries out mud jacking and water stopping operation in the tank after inserting and driving the steel sheet pile to the design position by adopting the conventional construction method for the bearing cap without the covering layer and positioned in the range of the rock stratum, reduces the construction cost, shortens the construction period, improves the working efficiency, and solves the problem of high construction difficulty of the steel sheet pile cofferdam under the condition of the low pile cap without the covering layer in the water area.
Drawings
FIG. 1 is a comparison of the steel sheet pile cofferdam of the present invention with a conventional steel sheet pile cofferdam;
FIG. 2 is a vertical plane layout view of a steel sheet pile cofferdam;
FIG. 3 is a view in the direction I-I of FIG. 2;
FIG. 4 is a schematic view of the insertion, driving and welding of steel sheet piles;
FIG. 5 is an elevational view of the guide;
FIG. 6 is a sectional view taken along line I-I of FIG. 5;
FIG. 7 is a schematic view of a state that supports in the bottom layer are lowered into the steel sheet pile cofferdam;
FIG. 8 is a schematic diagram of the excavation range of the rock stratum in the steel sheet pile cofferdam;
fig. 9 is a schematic view of a high-pressure grouting hole on the inner side of the steel sheet pile cofferdam.
In the figure: 1-a guide device, 2-a bracket, 3-a steel sheet pile cofferdam, 30-a steel sheet pile, 31-a bottom layer inner support, 32-a middle layer inner support, 33-a top layer inner support, 34-a pull rod, 4-a bearing platform, 5-a steel pipe pile and 6-a conventional steel sheet pile cofferdam.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 2 and 3, an embodiment of the present invention provides a method for constructing a steel sheet pile cofferdam of a low pile cap without a covering layer in a water area, including the following steps:
s1: as shown in fig. 1, when the steel sheet pile cofferdam 3 of the present invention is designed, the bearing platform is a circular bearing platform with a diameter of 11.5m, the length and width of the conventional steel sheet pile cofferdam are 13.2m and 13.2m, and the center of the conventional steel sheet pile cofferdam substantially coincides with the center of the bearing platform, while the length and width of the steel sheet pile cofferdam 3 of the present invention are 19.2m and 19.2m, and the center of the steel sheet pile cofferdam 3 of the present invention substantially coincides with the center of the bearing platform, therefore, the length and width of the steel sheet pile cofferdam of the present invention are both 6m greater than the length and width of the conventional steel sheet pile cofferdam, and the stability of the rock stratum under the steel sheet pile cofferdam 3 is ensured.
S2: as shown in fig. 5 and 6, after the construction of the bored pile is completed, the bored platform panel and the distribution beam are removed, and the river bed surface is cleaned, so that the elevation difference of the river bed surface within the range of the steel sheet pile cofferdam 3 is not more than 0.2m, and the smoothness of the river bed surface is ensured. And then the steel pipe pile 5 of the drilling platform is utilized. According to the designed position of the steel sheet pile cofferdam 3, a bracket 2 is welded on the steel pipe pile 5 at the corresponding position on the water surface, and a guide device 1 is arranged on the bracket 2.
S3: as shown in fig. 2 and 3, without milling grooves in the rock strata at the designed position, the steel sheet piles 30 are inserted and driven to the designed position along the outer wall direction (outer contour shape) of the guide device 1, and are sequentially connected end to end and closed to form the steel sheet pile cofferdam 3.
S4: as shown in fig. 7, welded bottom inner support 31 is suspended in steel sheet pile cofferdam 3 and fixed to steel sheet pile cofferdam 3 by underwater welding via tie rods 34.
S5: as shown in fig. 8 and 9, after the construction of the steel sheet pile cofferdam 3 is completed, whether high-pressure grouting is performed in the range between the inner side of the steel sheet pile cofferdam 3 and the side line of the bearing platform 4 is determined according to the rock stratum permeability. Aiming at the permeable rock stratum, high-pressure injection of cement slurry or water glass slurry into the rock stratum is carried out by adopting grouting equipment so as to ensure that the rock stratum in the steel sheet pile cofferdam 3 is impermeable in the construction process of the bearing platform. And after grouting is finished and the grouting strength meets the requirement, pumping water to the inner side of the steel sheet pile cofferdam 3 by adopting a high-power water pump. And (3) excavating rock stratum within the range of the bearing platform 4 under the anhydrous condition, pouring a concrete cushion layer, and constructing the bearing platform 4.
The steel sheet pile cofferdam 3 of the embodiment of the invention only needs to be inserted and punched with shallower depth by utilizing the strength characteristic of the rock stratum, and can meet the construction space of constructors and construction mechanical equipment after being widened compared with the conventional steel cofferdam.
The construction method of the embodiment of the invention fully utilizes the characteristics of the self strength and the stability of the rock stratum without milling the rock stratum at the design position of the steel sheet pile cofferdam, and carries out the mud jacking and water stopping operation in the tank after the bearing platform which is not provided with the covering layer and is positioned in the range of the rock stratum is inserted and driven to the design position by adopting the conventional construction method, thereby reducing the construction cost, shortening the construction period, improving the working efficiency and solving the problem of high construction difficulty of the steel sheet pile cofferdam under the condition of low pile bearing platform without the covering layer in the water area.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.

Claims (3)

1. A construction method of a steel sheet pile cofferdam of a low pile cap without a covering layer in a water area is characterized by comprising the following steps:
cleaning the river bed surface at the design position of the steel sheet pile cofferdam (3) so that the elevation difference of the river bed surface within the range of the steel sheet pile cofferdam (3) is not more than 0.2 m;
according to the design position, arranging a guide device (1) at a corresponding position on the water surface, and welding the guide device (1) on a bracket (2) of the steel pipe pile (5);
the steel sheet pile (30) is inserted and driven to the designed position along the direction of the outer wall of the guide device (1) without milling a groove in the rock stratum at the designed position, and penetrates into the rock stratum, and is sequentially connected end to form the steel sheet pile cofferdam (3);
the bottom-layer inner support (31) is placed into the steel sheet pile cofferdam (3) and is welded and fixed with the steel sheet pile cofferdam (3) through a pull rod (34);
sequentially lowering the middle-layer inner support (32) and the top-layer inner support (33) into the steel sheet pile cofferdam (3) and fixing the steel sheet pile cofferdam with the steel sheet pile cofferdam (3);
grouting equipment is adopted to perform high-pressure grouting on the rock stratum in the range between the inner side of the steel sheet pile cofferdam (3) and the side line of the bearing platform (4) so as to enable the rock stratum in the steel sheet pile cofferdam (3) to be impermeable;
the length and the width of the steel sheet pile cofferdam are 4-8 m larger than those of the conventional steel sheet pile cofferdam.
2. The construction method according to claim 1, wherein the rock formation in the steel sheet pile cofferdam (3) is excavated under anhydrous conditions using mechanical equipment.
3. The construction method according to claim 1, wherein the bottom layer inner support (31) is lowered into the steel sheet pile cofferdam (3) and is welded and fixed with the steel sheet pile cofferdam (3) through a pull rod (34), and the construction method specifically comprises the following steps:
hoisting the support (31) in the bottom layer into the steel sheet pile cofferdam (3);
and fixing the bottom layer inner support (31) with the steel sheet pile cofferdam (3) through a pull rod (34), connecting one end of the pull rod (34) to the top end of the bottom layer inner support (31), and connecting the other end of the pull rod to the inner wall of the steel sheet pile cofferdam (3).
CN202010183437.9A 2020-03-16 2020-03-16 Construction method of steel sheet pile cofferdam of water area covering-layer-free low pile cap Active CN111456049B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102912809A (en) * 2012-11-06 2013-02-06 中铁大桥局股份有限公司 Construction method for bearing platform with bottom surface in hard impervious bed
KR20130013287A (en) * 2011-07-28 2013-02-06 (주)대우건설 Wet-type constructing method of pier foundation
CN105133627A (en) * 2015-07-28 2015-12-09 安徽省新路建设工程集团有限责任公司 Construction method for single-wall steel sheet pile cofferdam in running water state
CN207003421U (en) * 2017-03-15 2018-02-13 广州市市政集团有限公司 A kind of steel plate pilework for being seated hard rock top surface

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130013287A (en) * 2011-07-28 2013-02-06 (주)대우건설 Wet-type constructing method of pier foundation
CN102912809A (en) * 2012-11-06 2013-02-06 中铁大桥局股份有限公司 Construction method for bearing platform with bottom surface in hard impervious bed
CN105133627A (en) * 2015-07-28 2015-12-09 安徽省新路建设工程集团有限责任公司 Construction method for single-wall steel sheet pile cofferdam in running water state
CN207003421U (en) * 2017-03-15 2018-02-13 广州市市政集团有限公司 A kind of steel plate pilework for being seated hard rock top surface

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