CN215406131U - Steel sheet pile cofferdam structure under foundation rock geology is covered to cobblestone - Google Patents
Steel sheet pile cofferdam structure under foundation rock geology is covered to cobblestone Download PDFInfo
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- CN215406131U CN215406131U CN202122006590.7U CN202122006590U CN215406131U CN 215406131 U CN215406131 U CN 215406131U CN 202122006590 U CN202122006590 U CN 202122006590U CN 215406131 U CN215406131 U CN 215406131U
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Abstract
The utility model discloses a steel sheet pile cofferdam structure under pebble covered bedrock geology, which belongs to the technical field of steel sheet pile cofferdam construction, and comprises a plurality of steel sheet piles and a steel sheet pile guide groove used for guiding the insertion and beating of the steel sheet piles, wherein the steel sheet pile guide groove is formed by sequentially meshing and arranging a plurality of steel sheet pile guide holes, and the steel sheet pile guide holes are guided to the position of a middle-graded rock layer in a rotary digging mode. The structure solves the problems of difficult steel sheet pile inserting and driving and water leakage of the traditional steel sheet pile cofferdam under the geological condition that pebbles cover bedrock.
Description
Technical Field
The utility model belongs to the technical field of steel sheet pile cofferdam construction, and particularly relates to a steel sheet pile cofferdam structure under foundation rock geology covered by pebbles.
Background
In the construction of deep foundation pits in water, the steel sheet pile cofferdam is widely applied due to the characteristics of wide application range, good use effect, reusability and the like. However, the construction of the common steel sheet pile cofferdam has certain limitation, and the prior steel sheet pile cofferdam structure is generally suitable for sandy soil, semi-dry clay and softer completely weathered rock stratum. For harder weak and medium-stroke stratum and large-particle-size pebble bed stratum, if steel sheet piles are directly inserted and driven, the steel sheet piles cannot be inserted and driven due to harder geology and deform greatly, and therefore the water stopping effect of the cofferdam is influenced. In addition, in the ground layer covered with pebbles, the steel sheet piles are difficult to be driven into the bedrock and cannot be driven. Aiming at solving the problems that the steel sheet pile cofferdam is difficult to insert and beat in a pebble layer and weak and medium petrochemical rock layers and the like, the steel sheet pile cofferdam is provided with the following steel sheet pile structures at the present stage:
1. a special structure of a high-pressure water gun with a sawtooth steel sheet pile is adopted; the high-pressure water gun is arranged in a double-pipe mode, compressed air and high-pressure water are simultaneously converged to form a quick punching force, and the purpose of scattering pebbles is achieved, so that steel sheet piles can be driven conveniently. Although the hole forming speed is high, the structure can not be used if the structure encounters large boulders or completely weathers the following bedrock. In addition, the method cannot solve the problem of water seepage of the foundation pit because pebbles are not replaced and filled.
2. The reverse cofferdam excavation replacement structure comprises: and filling soil and building islands by utilizing favorable opportunity of small water flow and flow velocity of the river in dry seasons, and excavating grooves in a certain range around the steel sheet piles by utilizing a long-arm excavator to remove underwater pebbles and replace and fill clay. And finally, driving the steel sheet piles. The cofferdam structure is simple in construction, but is only limited to a water area with small water flow velocity, and is difficult to apply to a water area with urgent water flow. In addition, the steel sheet pile cannot be driven into the bedrock, possibly resulting in insufficient stability.
3. Adopting a percussion drill to lead the hole for replacement and filling: and (3) according to the position of the steel sheet pile, mounting a positioning frame, then adopting a percussion drill to perform percussion hole forming, replacing and filling pebbles with machine-made sand and cohesive soil after hole forming, circulating in sequence until the hole is led to form a groove, and driving the steel sheet pile. When the structure is used for hole leading construction, one hole can be punched in 2-3d, and the hole forming efficiency is poor; the impact drilling has more sediments and is difficult to remove the sediments in the hole, and a permeable layer at the bottom of the hole is easy to form after clay is backfilled; the overlapped part of the hole sites is difficult to drill holes by impact (the holes are easy to deviate due to the fact that the holes are soft and hard at the same time).
Therefore, the steel sheet pile cofferdam structure under the pebble covered bedrock geology is provided, and the problems of difficulty in inserting and driving steel sheet piles and water leakage of the traditional steel sheet pile cofferdam under the geological condition that pebbles cover bedrock are solved.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model aims to provide a steel sheet pile cofferdam structure under pebble covered bedrock geology, which solves the problems of difficult steel sheet pile inserting and driving and water leakage of the traditional steel sheet pile cofferdam under the geological condition of pebble covered bedrock.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model relates to a steel sheet pile cofferdam structure under pebble covered bedrock geology, which comprises a plurality of steel sheet piles and a steel sheet pile guide groove used for guiding the insertion and the driving of the steel sheet piles, wherein the steel sheet pile guide groove is formed by sequentially meshing and arranging a plurality of steel sheet pile guide holes, and the steel sheet pile guide holes are guided to the position of a middle-graded rock layer in a rotary digging mode.
And further, filling clay in the steel sheet pile guide hole.
Furthermore, a small steel pile casing and a large steel pile casing are arranged in the steel sheet pile guide hole for supporting, and the large steel pile casing is arranged on the outer side of the small steel pile casing.
Furthermore, the root of the steel sheet pile cofferdam structure is filled with gravel soil.
Furthermore, the two sides of each steel sheet pile form locking notches, and the steel sheet piles are mutually fastened through the locking notches to form a closed structure along the inner side of the foundation pit.
Further, the inner side of the steel sheet pile is provided with at least one layer of double-spliced I-shaped steel ring beam, and the steel sheet pile is provided with a triangular bracket for supporting the double-spliced I-shaped steel ring beam.
Furthermore, the double-spliced I-shaped steel ring beam is formed by connecting a plurality of sections of connecting beams through combined welding joints.
Furthermore, a cross brace is arranged on the double-spliced I-shaped steel ring beam at a certain horizontal distance.
Furthermore, an inclined strut is arranged on the double-spliced I-shaped steel ring beam close to the corner position of the double-spliced I-shaped steel ring beam.
The utility model has the beneficial effects that:
the utility model relates to a steel sheet pile cofferdam structure under pebble covered bedrock geology, which comprises the following steps:
1. the steel sheet pile guide groove is formed by sequentially meshing and arranging a plurality of steel sheet pile guide holes, and the steel sheet pile guide holes are guided to the position of the middle-graded rock layer in a rotary digging mode, so that the steel sheet pile has deeper embedment depth, and the stability of the steel sheet pile is improved;
2. the clay backfilled in the steel sheet pile guide hole can also reduce the water seepage of the foundation pit;
3. compared with a reversed cofferdam excavation replacement filling structure, the structure has wider applicability and can be suitable for water areas with more urgent water flows. And the structure adopts a rotary excavating mode to guide the hole, so that the structure can go deep into bedrock, the embedding depth and the stability of the steel sheet pile are improved, and the reversed cofferdam excavation replacement filling structure can only be excavated to the position of the bedrock.
4. The pebble covering layer at the leading hole is dug and filled with loose gravel soil by utilizing the island building construction platform before the leading hole is excavated, and compared with the method of directly digging and drilling holes by impact drilling, the hole forming difficulty is reduced, the hole forming time is reduced, the loss of a drill bit is reduced, and the cost is saved.
Additional advantages, objects, and features of the utility model will be set forth in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the object, technical scheme and beneficial effect of the utility model more clear, the utility model provides the following drawings for explanation:
FIG. 1 is a vertical plane layout diagram of a steel sheet pile cofferdam structure;
FIG. 2 is a plan layout view of a steel sheet pile cofferdam structure;
FIG. 3 is a schematic structural view of a steel sheet pile guide hole;
FIG. 4 is a schematic plan view of a steel sheet pile guide groove;
fig. 5 is an enlarged view of fig. 4 at a.
The drawings are numbered as follows: the concrete foundation comprises a large steel pile casing 1, a small steel pile casing 2, clay 3, gravel soil 4, strongly weathered bedrock 5, medium weathered bedrock 6, pebbles 7, steel sheet piles 8, double-spliced I-shaped steel ring beams 9, cross braces 10, a concrete cushion layer 11, a triangular bracket 12, inclined braces 13, a combined welding joint 14 and steel sheet pile lead holes 15.
Detailed Description
As shown in fig. 1-2, the steel sheet pile 8 cofferdam structure with pebbles 7 covering the basement rock geology comprises a plurality of steel sheet piles 8 and steel sheet pile 8 guide grooves for guiding the steel sheet piles 8 to be inserted and beaten, wherein the steel sheet pile 8 guide grooves are formed by sequentially meshing and arranging a plurality of steel sheet pile guide holes 15, and the steel sheet pile guide holes 15 are guided to the position of a middle-graded rock layer in a rotary digging mode.
According to the steel sheet pile 8 cofferdam structure, the steel sheet pile 8 adopts the Larsen IV steel sheet pile 8, the steel sheet pile 8 guide groove is formed by sequentially meshing and arranging a plurality of steel sheet pile guide holes 15, and the steel sheet pile guide holes 15 are guided to the position of a middle-graded rock layer in a rotary digging manner, so that the steel sheet pile 8 has a deeper embedment depth, and the stability of the steel sheet pile 8 is improved. Due to the adoption of the rotary drilling mode for hole guiding, the steel plate pile can penetrate into bedrock, the embedding depth and the stability of the steel plate pile 8 are improved, and the reversed cofferdam excavation replacement filling structure can only be excavated to the position of the bedrock.
In this embodiment, steel sheet pile draws and fills through clay 3 in the hole 15, adopts clay 3's self characteristic, can reduce the infiltration of foundation ditch.
In this embodiment, the steel sheet pile guide hole 15 is internally supported by a small steel casing 2 and a large steel casing 1, and the large steel casing 1 is arranged outside the small steel casing 2, so that construction is facilitated, and efficiency is improved.
In this embodiment, the root of the steel sheet pile 8 cofferdam structure is filled with gravel soil 4, and the island construction platform is utilized to excavate and remove the pebble 7 covering layer at the leading hole and fill loose gravel soil 4 before excavating the leading hole, so that compared with the method of directly excavating and impacting to drill the hole, the hole forming difficulty is reduced, the hole forming time is reduced, the loss of a drill bit is reduced, and the cost is saved.
In this embodiment, the both sides of each steel sheet pile 8 form the fore shaft, enclose into enclosed construction along the foundation ditch inboard through the mutual lock catch between each steel sheet pile 8, let the support of structure more stable.
In this embodiment, the inner side of the steel sheet pile 8 is provided with at least one layer of double-spliced i-shaped steel ring beam 9, and the steel sheet pile 8 is provided with a triangular bracket 12 for supporting the double-spliced i-shaped steel ring beam 9. The double-spliced I-shaped steel ring beam 9 is formed by connecting a plurality of sections of connecting beams through combined welding joints 14.
In this embodiment, be provided with a stull 10 every certain horizontal distance on the double-pin I-steel circle roof beam 9, be close to its corner position on the double-pin I-steel circle roof beam 9 and be provided with bracing 13, increased the stability of structure.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the utility model, and that, although the utility model has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the utility model as defined by the appended claims.
Claims (9)
1. The utility model provides a steel sheet pile cofferdam structure under cobble cover basement rock geology, includes a plurality of steel sheet piles, its characterized in that: the steel sheet pile guide groove is formed by sequentially meshing and arranging a plurality of steel sheet pile guide holes, and the steel sheet pile guide holes are guided to the middle-divided rock stratum position in a rotary excavating mode.
2. The steel sheet pile cofferdam structure of pebble covered bedrock geology according to claim 1, characterized in that: and filling clay in the steel sheet pile guide hole.
3. The steel sheet pile cofferdam structure of pebble covered bedrock geology according to claim 2, characterized in that: and a small steel pile casing and a large steel pile casing are arranged in the steel sheet pile guide hole for supporting, and the large steel pile casing is arranged on the outer side of the small steel pile casing.
4. The steel sheet pile cofferdam structure of pebble covered bedrock geology according to claim 1, characterized in that: and the root of the steel sheet pile cofferdam structure is filled with gravel soil.
5. Steel sheet pile cofferdam structure under pebble covered bedrock geology according to any of claims 1 to 4, characterized in that: and locking notches are formed at two sides of each steel sheet pile, and the steel sheet piles are mutually fastened through the locking notches to form a closed structure along the inner side of the foundation pit.
6. The steel sheet pile cofferdam structure of pebble covered bedrock geology according to claim 5, characterized in that: the steel sheet pile is characterized in that at least one layer of double-spliced I-shaped steel ring beam is arranged on the inner side of the steel sheet pile, and a triangular bracket used for supporting the double-spliced I-shaped steel ring beam is arranged on the steel sheet pile.
7. The steel sheet pile cofferdam structure of pebble covered bedrock geology according to claim 6, characterized in that: the double-spliced I-shaped steel ring beam is formed by connecting a plurality of sections of connecting beams through combined welding joints.
8. The steel sheet pile cofferdam structure of pebble covered bedrock geology according to claim 7, characterized in that: and one cross brace is arranged on the double-spliced I-shaped steel ring beam at a certain horizontal distance.
9. The steel sheet pile cofferdam structure of pebble covered bedrock geology according to claim 8, characterized in that: and the double-spliced I-shaped steel ring beam is provided with inclined struts close to the corners of the double-spliced I-shaped steel ring beam.
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| CN202122006590.7U CN215406131U (en) | 2021-08-24 | 2021-08-24 | Steel sheet pile cofferdam structure under foundation rock geology is covered to cobblestone |
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| CN202122006590.7U CN215406131U (en) | 2021-08-24 | 2021-08-24 | Steel sheet pile cofferdam structure under foundation rock geology is covered to cobblestone |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114482099A (en) * | 2022-02-10 | 2022-05-13 | 中交二航局第二工程有限公司 | Steel sheet pile cofferdam construction method |
| CN114775665A (en) * | 2022-05-31 | 2022-07-22 | 中国建筑第七工程局有限公司 | Design method and structure of steel sheet pile cofferdam covered with thick pebble bed on bedrock |
| CN115324085A (en) * | 2022-07-25 | 2022-11-11 | 中交一公局厦门工程有限公司 | Basement rock skirting protection device for bottom-sealing-free rock-socketed steel sheet pile cofferdam |
-
2021
- 2021-08-24 CN CN202122006590.7U patent/CN215406131U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114482099A (en) * | 2022-02-10 | 2022-05-13 | 中交二航局第二工程有限公司 | Steel sheet pile cofferdam construction method |
| CN114775665A (en) * | 2022-05-31 | 2022-07-22 | 中国建筑第七工程局有限公司 | Design method and structure of steel sheet pile cofferdam covered with thick pebble bed on bedrock |
| CN115324085A (en) * | 2022-07-25 | 2022-11-11 | 中交一公局厦门工程有限公司 | Basement rock skirting protection device for bottom-sealing-free rock-socketed steel sheet pile cofferdam |
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