CN112227391B - Ecological steel sheet pile island-building cofferdam and construction method - Google Patents

Ecological steel sheet pile island-building cofferdam and construction method Download PDF

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Publication number
CN112227391B
CN112227391B CN202011095202.0A CN202011095202A CN112227391B CN 112227391 B CN112227391 B CN 112227391B CN 202011095202 A CN202011095202 A CN 202011095202A CN 112227391 B CN112227391 B CN 112227391B
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steel sheet
sheet pile
plate
construction
pile
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CN112227391A (en
Inventor
胡先宽
李凡刚
严焰兵
王伟
包春伟
管海洋
冯晓见
胡浩
程林峰
张奎
李顶
谢圣帅
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Anhui Gourgen Traffic Construction Co ltd
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Anhui Gourgen Traffic Construction Co ltd
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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
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/02Sheet piles or sheet pile bulkheads
    • E02D5/16Auxiliary devices rigidly or detachably arranged on sheet piles for facilitating assembly

Abstract

The invention provides an ecological steel sheet pile island-building cofferdam and a construction method, wherein an in-situ curing layer, a clay filling layer and greening planting soil are arranged between a first steel sheet pile and a second steel sheet pile; a position control tie bar and a riprap counter-pressure body are arranged on the side, facing the water body, of the third steel sheet pile, and the stability of the position control tie bar can be improved through the anti-pulling anchor bars and the anti-pulling grouting body; the top ends of the first steel sheet pile and the second steel sheet pile are provided with top bracing beams, sliding bracing columns capable of moving longitudinally along the top bracing beams are arranged, and a pressure control body is adopted to apply dense pressure to the clay filling layer; pile top crown beams are arranged at the top ends of the first steel sheet pile and the third steel sheet pile, the bottom end of the connecting sleeve is provided with a wave-proof pressing plate, and the bottom end of the oil-blocking rope lifting rope is provided with an oil-blocking rope; and a heightened baffle is arranged at the upper part of the pile top crown beam. The invention can improve the stress performance and greening effect of the cofferdam, improve the field construction efficiency and protect the construction environment.

Description

Ecological steel sheet pile island-building cofferdam and construction method
Technical Field
The invention relates to cofferdam engineering in bridge engineering or water conservancy engineering, in particular to an ecological steel sheet pile island-building cofferdam structure and a construction method, which can improve the stress performance and greening effect of a cofferdam and protect the construction environment.
Background
The steel sheet pile cofferdam is a foundation cofferdam construction technology with great advantages at present, and is widely applied to temporary structures such as flood control and flow break, pier cofferdam, flood control and emergency rescue and the like. However, in the inserting and driving construction of the steel sheet pile, the problems of difficult guiding and driving of the steel sheet pile, difficult filling and compaction of clay, poor seepage-proofing effect, difficult control of environmental pollution and the like exist.
In the prior art, a construction method of a steel sheet pile cofferdam is provided, which comprises the following steps: (1) construction preparation work; (2) measuring and setting out, namely measuring and setting out to determine four angular points of the cofferdam according to the design size of the cofferdam and the central position of a bearing platform, and driving positioning piles at the angular points to serve as control points for positioning the steel sheet pile cofferdam; (3) constructing an inner support system consisting of a guide beam, wails, an inner support, a connecting beam and a joist; (4) the wailing inner bracing is welded, assembled and integrally put down first and then steel sheet pile inserting and driving construction is carried out; (5) cofferdam sludge suction; (6) closing the bottom of the cofferdam; (7) pumping water from the cofferdam and cleaning the foundation; (8) and (5) removing the cofferdam. The technology can basically meet the requirement of the steel sheet pile cofferdam for construction under the geological condition of the super-thick sand gravel layer by improving the construction sequence and adopting special construction equipment, although the method is relatively simple to operate, partial construction work can be carried out simultaneously, and the construction period can be shortened. But the technology can not synchronously solve the engineering problems of rapid filling and compacting of clay between cofferdams, greening of weir crest, improvement of cofferdam seepage-proofing effect and the like.
In view of this, in order to improve the quality and efficiency of the steel sheet pile cofferdam construction, the invention of the ecological steel sheet pile island-building cofferdam and the construction method which can improve the structural stability and greening effect of the cofferdam, reduce the difficulty of the compaction construction of the clay filling layer and avoid the pollution of the construction oil stain to the adjacent water area is urgently needed.
Disclosure of Invention
The invention aims to provide the construction method of the ecological steel sheet pile island-building cofferdam, which can improve the structural stability and greening effect of the cofferdam, reduce the difficulty of compaction construction of a clay filling layer and avoid the pollution of construction oil stains to adjacent water areas.
In order to achieve the above purpose, the technical scheme provides a construction method of an ecological steel sheet pile island-building cofferdam, which comprises the following construction steps:
1) construction preparation: determining the plane positions of the first steel sheet pile (1), the second steel sheet pile (2) and the third steel sheet pile (3), and preparing materials and devices required by construction;
2) and (3) guiding and inserting the steel sheet piles: inserting a row of guide steel sheet piles (6) into a foundation soil body (5) at two sides of an inserting position of each inserted steel sheet pile (4), arranging a positioning clamping plate (7) at the top ends of the two rows of guide steel sheet piles (6), adjusting the plane position of the positioning clamping plate (7) through a clamping plate bolt (8), sequentially driving and constructing a first steel sheet pile (1), a second steel sheet pile (2) and a third steel sheet pile (3) by adopting a steel sheet pile inserting device, sequentially penetrating a transverse tie bar (9) through a transverse anchor backing plate (10) of the first steel sheet pile (1), the second steel sheet pile (2) and the third steel sheet pile (3), and applying transverse fastening tension to the transverse tie bar (9); opposite-pulling anchor beams (13) are respectively arranged on the sides of the first steel sheet pile (1) and the second steel sheet pile (2) departing from the clay filling layer (12), and opposite-pulling anchor bars (14) are arranged between the opposite-pulling anchor beams (13); arranging a tie bar supporting plate (15) on the side of the third steel sheet pile (3) facing the water body, firmly connecting an anchor bar connecting plate (17) with a foundation soil body (5) through an uplift anchor bar (16), arranging an uplift grouting body (19) on the outer side of the uplift anchor bar (16) through grouting, and arranging a position control tie bar (20) between the tie bar supporting plate (15) and the anchor bar connecting plate (17);
3) laying an anti-seepage geomembrane and a riprap counter-pressure body: an anti-seepage geomembrane (21) is arranged on the side, away from the water body, of the third steel sheet pile (3), and a riprap counter-pressure body (23) is arranged at the joint of the third steel sheet pile (3) and the foundation soil body (5);
4) construction of an in-situ cured layer: adopting cement mortar or cement paste to solidify the foundation soil body (5) between the first steel sheet pile (1) and the second steel sheet pile (2) to form an in-situ solidified layer (24);
5) clay filling layer construction: a top supporting beam (25) is arranged between the first steel sheet pile (1) and the second steel sheet pile (2), the top supporting beam (25) is arranged between the first steel sheet pile (1) and the second steel sheet pile (2), a balance supporting plate (28) is arranged on the side, facing the water body, of the first steel sheet pile (1), a pressure-weight body connecting plate (29) is arranged at the joint of the second steel sheet pile (2) and a foundation soil body (5), and a balance pressure-weight body (30) is arranged on the pressure-weight body connecting plate (29); filling a clay filling layer (12) on the upper surface of the in-situ cured layer (24), firstly adjusting the plane position of a sliding support column (32), connecting the sliding support column (32) to a top support beam (25) in a sliding manner, and then applying a jacking force to a compaction pressing plate (34) arranged on the clay filling layer (12) through a pressure control body (33) at the bottom of the sliding support column (32) so as to ensure that the compactness of the clay filling layer (12) meets the set requirement; after the clay filling layer (12) is filled to a set elevation, digging a weir top drainage ditch (35) on the side, close to the first steel sheet pile (1), of the top surface of the clay filling layer (12), and enabling the weir top drainage ditch (35) to be communicated with external water pumping equipment;
6) and (3) greening soil layer construction: firstly, paving a reverse filtration water-resisting layer (36) on the top surface of the clay filling layer (12), paving green planting soil (37), and arranging a prefabricated pressing plate (38) on the top surface of the green planting soil (37);
7) arranging a wave-proof pressing plate and an oil blocking rope: a pile top crown beam (39) is arranged at the top ends of the first steel sheet pile (1) and the third steel sheet pile (3) along the length direction of the cofferdam in a through manner, a sleeve connecting beam (41) is connected to the pile top crown beam (39), a connecting sleeve (42) and an oil blocking rope lifting rope (43) are arranged on the lower surface of the sleeve connecting beam (41), and a wave-proof pressing plate (44) at the bottom end of the connecting sleeve (42) and an oil blocking rope (45) at the bottom end of the oil blocking rope lifting rope (43) are enabled to freely fall to the upper surface of a water body outside the cofferdam;
8) heightening a baffle plate and arranging: when the water level outside the cofferdam suddenly rises, the bottom end of the heightened baffle (46) is inserted into the crown beam connecting groove (47) of the pile top crown beam (39), and the baffle connecting rod (48) is firmly connected with the connecting rod positioning plate (49).
Compared with the prior art, the technical scheme has the following characteristics and beneficial effects:
(1) according to the invention, the in-situ curing layer, the clay filling layer and the greening planting soil are arranged between the first steel sheet pile and the second steel sheet pile, so that the greening effect of the top of the cofferdam can be improved while the seepage-proofing effect of the cofferdam is improved.
(2) According to the invention, the position control tie bar and the riprap counter-pressure body are arranged on the side of the third steel sheet pile facing the water body, the stability of the position control tie bar can be improved through the anti-pulling anchor bar and the anti-pulling grouting body, and the bearing performance of the third steel sheet pile is improved.
(3) The top supporting beam is arranged at the top end of the first steel sheet pile and the top end of the second steel sheet pile, the sliding supporting column capable of moving longitudinally along the top supporting beam is arranged, the pressure control body is adopted to apply compact pressure to the clay filling layer, the self weight of the steel sheet pile cofferdam structure can be fully utilized, and the difficulty of compaction construction of the clay filling layer is reduced.
(4) According to the invention, the pile top crown beams are arranged at the top ends of the first steel sheet pile and the third steel sheet pile, and the wave-proof pressing plate is arranged at the bottom end of the connecting sleeve, so that the influence of waves on the cofferdam structure can be reduced; meanwhile, the bottom end of the oil blocking rope lifting rope is provided with the oil blocking rope, so that the pollution of construction oil stains to adjacent water areas can be avoided.
(5) According to the cofferdam structure, the heightening baffle is arranged at the upper part of the pile top crown beam, so that the temporary heightening protection effect can be achieved, and the stability of the cofferdam structure is improved.
Drawings
Fig. 1 is a construction flow chart of the ecological steel sheet pile island-building cofferdam according to an embodiment of the invention.
Fig. 2 is a schematic view of the inserted steel sheet pile guide of fig. 1.
Fig. 3 is a schematic structural view of the clay-filled layered packing construction of fig. 1.
Fig. 4 is a schematic structural view of the connection between the sliding brace and the top brace of fig. 3.
Fig. 5 is a schematic structural view of the steel sheet pile cofferdam of fig. 1 after construction is completed.
Fig. 6 is a schematic structural view of the uplift anchor of fig. 5.
Fig. 7 is a schematic structural view of the greening planting soil of fig. 5 connected with a prefabricated pressing plate.
Fig. 8 is a schematic view of the connection sleeve of fig. 5 in connection with the sleeve and the wave breaker plate.
In the figure: 1-a first steel sheet pile; 2-a second steel sheet pile; 3-a third steel sheet pile; 4-inserting steel sheet piles; 5-foundation soil mass; 6-guiding steel sheet piles; 7-positioning the clamping plate; 8-a splint bolt; 9-transverse tie bars; 10-transverse anchor backing plate; 11-the tie bar is perforated; 12-clay filling layer; 13-opposite pulling anchor beam; 14-opposite pulling anchor bars; 15-stretching a rib supporting plate; 16-uplift anchor bars; 17-anchor bar connecting plate; 18-tie bar connecting bolt; 19-anti-pulling grouting body; 20-controlling the position and stretching the tendon; 21-impermeable geomembrane; 22-geomembrane press plate; 23-riprap counter-pressure body; 24-curing the layer in situ; 25-top bracing beam; 26-a strut beam connector; 27-connector securing peg; 28-balance supporting plate; 29-pressing a weight connecting plate; 30-balance weight body; 31-a limit bottom baffle; 32-a sliding support column; 33-a pressure control body; 34-compacting press plate; 35-weir crest drainage ditch; 36-reverse filtering water-proof layer; 37-planting green soil; 38-prefabricating a pressing plate; 39-pile top crown beam; 40-crown beam connecting bolt; 41-sleeve connecting beam; 42-connecting the sleeve; 43-oil barrier rope; 44-wave-resistant press plates; 45-oil barrier rope; 46-heightening baffle; 47-crown beam connecting groove; 48-a baffle link; 49-connecting rod positioning plate; 50-end hinge of screw rod; 51-slurry overflow hole; 52-supporting beam sliding groove; 53-strut slide plate; 54-brace base plate; 55-telescopic pipe section; 56-fixed tube section; 57-limit top baffle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Technical requirements of on-site hoisting construction, technical requirements of section steel rolling and welding construction, technical requirements of bolt fastening construction, technical requirements of steel sheet pile driving construction, technical requirements of clay filling construction and the like are omitted for repeated description, and the implementation mode of the method is mainly explained.
Fig. 1 is a construction flow chart of the ecological steel sheet pile island-building cofferdam of the invention, and referring to fig. 1, the construction method of the ecological steel sheet pile island-building cofferdam comprises the following construction steps:
1) construction preparation: determining the plane positions of the first steel sheet pile (1), the second steel sheet pile (2) and the third steel sheet pile (3), and preparing materials and devices required by construction;
2) and (3) guiding and inserting the steel sheet piles: inserting a row of guide steel sheet piles (6) into a foundation soil body (5) at two sides of an inserting position of each inserted steel sheet pile (4), arranging a positioning clamping plate (7) at the top ends of the two rows of guide steel sheet piles (6), adjusting the plane position of the positioning clamping plate (7) through a clamping plate bolt (8), sequentially driving and constructing a first steel sheet pile (1), a second steel sheet pile (2) and a third steel sheet pile (3) by adopting a steel sheet pile inserting device, sequentially penetrating a transverse tie bar (9) through a transverse anchor backing plate (10) of the first steel sheet pile (1), the second steel sheet pile (2) and the third steel sheet pile (3), and applying transverse fastening tension to the transverse tie bar (9); opposite-pulling anchor beams (13) are respectively arranged on the sides of the first steel sheet pile (1) and the second steel sheet pile (2) departing from the clay filling layer (12), and opposite-pulling anchor bars (14) are arranged between the opposite-pulling anchor beams (13); arranging a tie bar supporting plate (15) on the side of the third steel sheet pile (3) facing the water body, firmly connecting an anchor bar connecting plate (17) with a foundation soil body (5) through an uplift anchor bar (16), arranging an uplift grouting body (19) on the outer side of the uplift anchor bar (16) through grouting, and arranging a position control tie bar (20) between the tie bar supporting plate (15) and the anchor bar connecting plate (17);
in step 2), the positioning clamping plates (7) are arranged oppositely, one sides of the positioning clamping plates (7) are connected through clamping plate bolts (8), the clamping plate bolts (8) are formed by adopting screw rods in a rolling mode, one ends of the clamping plate bolts (8) are connected with the positioning clamping plates (7) through screw rod end hinges (50), and the other ends of the clamping plate bolts penetrate through the guide steel plate piles (6) and then are controlled by bolts.
The inserted steel sheet pile (4) comprises a first steel sheet pile (1), a second steel sheet pile (2) and a third steel sheet pile (3).
The avris of every steel sheet pile is equipped with horizontal anchor slab (10), form tie bar on horizontal anchor slab (10) and wear to establish hole (11), with horizontal tie bar (9) pass first steel sheet pile (1) in proper order, tie bar on horizontal anchor slab (10) of second steel sheet pile (2) and third steel sheet pile (3) wears to establish hole (11), horizontal anchor slab (10) on first steel sheet pile (1) and horizontal anchor slab (10) on second steel sheet pile (2) are all arranged in and are deviated from clay filling layer (12) side, horizontal anchor slab (10) on third steel sheet pile (3) are arranged in towards the water body side.
The split anchor beam (13) is formed by rolling section steel beams or steel sheet piles and is welded with the first steel sheet pile (1) or the second steel sheet pile (2) which are connected with each other. Wherein the split anchor beams (13) on the first steel sheet pile (1) and the second steel sheet pile (2) are arranged on the same horizontal plane, and the split anchor bars (14) are connected with the split anchor beams (13) on two sides
The anti-pulling anchor bar (16) is formed by rolling a steel pipe, a slurry overflow hole (51) is formed in the side wall of the anti-pulling anchor bar (16), the anti-pulling grouting body (19) is made of cement mortar or cement paste, the tie bar supporting plate (15) and the anchor bar connecting plate (17) are formed by rolling steel plates, and the tie bar connecting bolt (18) is connected with the position control tie bar (20).
3) Laying an anti-seepage geomembrane and a riprap counter-pressure body: an anti-seepage geomembrane (21) is arranged on the side, away from the water body, of the third steel sheet pile (3), and a riprap counter-pressure body (23) is arranged at the joint of the third steel sheet pile (3) and the foundation soil body (5);
in the step 3), the impermeable geomembrane (21) and the third steel sheet pile (3) can be firmly connected through the geomembrane pressing plate (22), the impermeable geomembrane (21) adopts a rubber sheet or a geomembrane, and the riprap counter-pressure body (23) adopts a binge gabion or bagged crushed gravel.
4) Construction of an in-situ cured layer: adopting cement mortar or cement paste to solidify the foundation soil body (5) between the first steel sheet pile (1) and the second steel sheet pile (2) to form an in-situ solidified layer (24);
5) clay filling layer construction: a top supporting beam (25) is arranged between the first steel sheet pile (1) and the second steel sheet pile (2), a balance supporting plate (28) is arranged on the side, facing the water body, of the first steel sheet pile (1), a pressure-weight body connecting plate (29) is arranged at the joint of the second steel sheet pile (2) and the foundation soil body (5), and a balance pressure-weight body (30) is arranged on the pressure-weight body connecting plate (29); filling a clay filling layer (12) on the upper surface of the in-situ cured layer (24), firstly adjusting the plane position of a sliding support column (32), connecting the sliding support column (32) to a top support beam (25) in a sliding manner, and then applying a jacking force to a compaction pressing plate (34) arranged on the clay filling layer (12) through a pressure control body (33) at the bottom of the sliding support column (32) so as to ensure that the compactness of the clay filling layer (12) meets the set requirement; after the clay filling layer (12) is filled to a set elevation, digging a weir top drainage ditch (35) on the side, close to the first steel sheet pile (1), of the top surface of the clay filling layer (12), and enabling the weir top drainage ditch (35) to be communicated with external water pumping equipment;
in step 5), the two ends of the top bracing beam (25) are provided with bracing beam connectors (26) connected with the first steel sheet pile (1) and the second steel sheet pile (2), the bracing beam connectors (26) are firmly connected with the first steel sheet pile (1) and the second steel sheet pile (2) through connector fastening bolts (27), the top bracing beam (25) is formed by rolling steel plates, the cross section of the top bracing beam is rectangular, the two ends of the top bracing beam are welded with the bracing beam connectors (26), bracing beam chutes (52) are arranged on the top bracing beam (25), the cross section of the bracing beam connectors (26) is U-shaped and sleeved on the top ends of the first steel sheet pile (1) and the second steel sheet pile (2), and the cross section of the bracing beam chutes (52) is T-shaped. The sliding support column (32) is formed by rolling a section steel column or a steel pipe, a support column sliding plate (53) at the top end is connected with a support beam sliding groove (52) of the top support beam (25), and the bottom end is vertically welded and connected with a support column bottom plate (54).
Balance supporting plates (28) and weight connecting plates (29) are respectively welded with the first steel sheet pile (1) and the second steel sheet pile (2), the cross section of each weight connecting plate (29) is L-shaped, and the weight connecting plates are arranged on the side departing from the in-situ curing layer (24).
The pressure control body (33) adopts a hydraulic jack, the bottom surface and the top surface are respectively connected with the compact pressing plate (34) and the bracing column base plate (54), the cross section of the weir top drainage ditch (35) is trapezoidal, and crushed gravel materials are filled in the weir top drainage ditch (35).
6) And (3) greening soil layer construction: firstly, paving a reverse filtration water-resisting layer (36) on the top surface of the clay filling layer (12), paving green planting soil (37), and arranging a prefabricated pressing plate (38) on the top surface of the green planting soil (37);
in the step 6), the green planting soil (37) adopts planting concrete or sandy soil; the prefabricated pressing plate (38) is formed by sticking PVC strips and is laid on the top surface of the greening planting soil (37) in a grid shape.
7) Arranging a wave-proof pressing plate and an oil blocking rope: a pile top crown beam (39) is arranged at the top ends of the first steel sheet pile (1) and the third steel sheet pile (3) along the length direction of the cofferdam in a through manner, a sleeve connecting beam (41) is connected to the pile top crown beam (39), a connecting sleeve (42) and an oil blocking rope lifting rope (43) are arranged on the lower surface of the sleeve connecting beam (41), and a wave-proof pressing plate (44) at the bottom end of the connecting sleeve (42) and an oil blocking rope (45) at the bottom end of the oil blocking rope lifting rope (43) are enabled to freely fall to the upper surface of a water body outside the cofferdam;
in the step 7), a pile top crown beam (39) is firmly connected with the first steel sheet pile (1) and the third steel sheet pile (3) which are connected through a crown beam connecting bolt (40), the pile top crown beam (39) is formed by rolling steel plates or H-shaped steel, the cross section of the pile top crown beam is H-shaped, a screw hole connected with the crown beam connecting bolt (40) is formed in the side wall of the pile top crown beam (39), and the side wall facing the water body is vertically welded and connected with a sleeve connecting beam (41).
The sleeve connecting beams (41) are formed by rolling steel plates or section steel and are uniformly distributed at intervals along the longitudinal direction of the pile top crown beam (39).
The connecting sleeve (42) comprises 2-5 sections of telescopic pipe sections (55) with continuously changed diameters and 1 section of fixed pipe section (56), all the sections are formed by rolling steel pipes, and two ends of each telescopic pipe section (55) are respectively provided with a limit top baffle (57) and a limit bottom baffle (31). Wherein the bottom side of the fixed pipe section (56) is provided with an opening, the top side is fixed on the sleeve connecting beam (41), the width of the limit top baffle (57) at the top side of the telescopic pipe section (55) is greater than that of the opening at the bottom side of the fixed pipe section (56) so as to limit the movement of the telescopic pipe section (55), correspondingly, the limit bottom baffle (31) of the telescopic pipe section (55) is provided with an opening, and the width of the opening is less than that of the limit top baffle (57) at the top side of the next telescopic pipe section (55)
The wave-proof pressure plate (44) adopts a foam plate or a plastic plate; the oil blocking rope (45) is hemp rope or nylon rope.
8) Heightening a baffle plate and arranging: when the water level outside the cofferdam suddenly rises, the bottom end of the heightening baffle (46) is inserted into the crown beam connecting groove (47) of the pile top crown beam (39), and the baffle connecting rod (48) is firmly connected with the connecting rod positioning plate (49) of the heightening baffle (46).
In the step 8), the baffle connecting rod (48) is formed by rolling a screw rod, and the two ends of the baffle connecting rod are fastened through nuts after penetrating through the connecting rod positioning plate (49); the connecting rod positioning plate (49) is formed by rolling a steel plate and is connected with the heightening baffle (46) in a welding mode.
According to a second aspect of the invention, an ecological steel sheet pile island-building cofferdam structure constructed according to the construction method on the ecological steel sheet pile island-building cofferdam structure is provided.
Fig. 2 is a schematic view of the guide device of the inserted steel sheet pile of fig. 1, fig. 3 is a schematic view of a construction structure of clay-filled layered compaction filling of fig. 1, fig. 4 is a schematic view of a connection structure of a sliding brace and a top brace of fig. 3, fig. 5 is a schematic view of a structure after the construction of the steel sheet pile cofferdam of fig. 1 is completed, fig. 6 is a schematic view of a structure of an uplift anchor bar of fig. 5, fig. 7 is a schematic view of a connection structure of the planting soil for greening of fig. 5 and a prefabricated pressing plate, and fig. 8 is a schematic view of a connection structure of a connection sleeve of fig. 5 and a sleeve and a connection structure of a wave-proof pressing plate.
Referring to fig. 2 to 8, in the ecological steel sheet pile island-building cofferdam structure, an in-situ curing layer (24), a clay filling layer (12) and planting green soil (37) are arranged between a first steel sheet pile (1) and a second steel sheet pile (2); a position control tie bar (20) and a riprap counter-pressure body (23) are arranged on the side, facing the water body, of the third steel sheet pile (3), and the stability of the position control tie bar (20) can be improved through the anti-pulling anchor bar (16) and the anti-pulling grouting body (19); the top ends of the first steel sheet pile (1) and the second steel sheet pile (2) are provided with a top bracing beam (25), a sliding bracing column (32) capable of longitudinally moving along the top bracing beam (25) is arranged, and a pressure control body (33) is adopted to apply dense pressure to the clay filling layer (12); the top ends of the first steel sheet pile (1) and the third steel sheet pile (3) are provided with pile top crown beams (39), the bottom end of the connecting sleeve (42) is provided with a wave-proof pressure plate (44), and the bottom end of the oil-blocking rope lifting rope (43) is provided with an oil-blocking rope (45); a heightening baffle plate (46) is arranged at the upper part of the pile top crown beam (39).
Insert and establish steel sheet pile (4) including first steel sheet pile (1), second steel sheet pile (2) and third steel sheet pile (3), first steel sheet pile (1), saddle-IV type steel sheet pile is all adopted in second steel sheet pile (2) and third steel sheet pile (3), and single section length is 8 m.
The foundation soil body (5) is sandy soil in a plastic state.
The clamping plate bolt (8) is formed by rolling a screw rod with the diameter of 30mm, one end of the clamping plate bolt is connected with the positioning clamping plate (7) through a screw rod end hinge (50), and the other end of the clamping plate bolt passes through the guide steel plate pile (6) and then is controlled by the bolt. The positioning clamping plate (7) is formed by rolling a steel plate with the thickness of 10mm, the guide steel plate pile (6) is a saddle-IV type steel plate pile, and the screw end hinge (50) is a spherical hinge with the diameter of 30 mm.
The transverse tie bar (9) adopts a steel wire rope with the diameter of 20 mm.
The transverse anchor backing plate (10) is formed by rolling a steel plate with the thickness of 10 mm.
The diameter of the tie bar through hole (11) is 30 mm.
The height of the clay filling layer (12) was 4m, and the loose thickness of each layer was 30 cm.
The split anchor beam (13) is formed by rolling a steel plate with the thickness of 20mm and the width of 30cm and is connected with the first steel sheet pile (1) or the second steel sheet pile (2) in a welding mode.
The split anchor bars (14) are formed by rolling screws with the diameters of 30 mm.
The lacing wire supporting plate (15) and the anchor rib connecting plate (17) are both formed by rolling steel plates with the thickness of 10mm and are respectively connected with the position control lacing wire (20) through lacing wire connecting bolts (18). Wherein, the lacing wire connecting bolt (18) adopts a buckling ring with the diameter of 30mm, and the position-controlling lacing wire (20) is made of a steel pipe with the diameter of 30 mm.
The uplift anchor bar (16) is made of a steel pipe with the diameter of 90mm, a grout overflow hole (51) is formed in the side wall of the uplift anchor bar (16), and the diameter of the grout overflow hole (51) is 60 mm.
The anti-drawing grouting body (19) adopts cement slurry with strength grade.
The impermeable geomembrane (21) adopts a rubber sheet with the thickness of 2 mm; the geomembrane pressing plate (22) is formed by rolling a steel plate with the thickness of 10 mm; the riprap counter-pressure body (23) adopts a binge stone cage.
The connecting body fastening bolt (27) is formed by rolling a high-strength screw rod with the diameter of 30 mm.
The balance supporting plate (28) and the weight connecting plate (29) are rolled by steel plates with the thickness of 10mm and are respectively welded with the first steel sheet pile (1) and the second steel sheet pile (2); the cross section of the weight pressing connecting plate (29) is L-shaped and is arranged at the side deviating from the in-situ curing layer (24); the in-situ cured layer (24) is formed by curing a foundation soil body (5) by using common portland cement, and the thickness is 50 cm.
The balance weight body (30) adopts a concrete precast block, the height is 100cm, and the width is 50 cm.
The top supporting beam (25) is formed by rolling a steel plate with the thickness of 2mm, the cross section of the top supporting beam is rectangular, two ends of the top supporting beam are welded with the supporting beam connecting body (26), and a supporting beam sliding groove (52) is arranged on the top supporting beam (25); the supporting beam connector (26) is formed by rolling a steel plate with the thickness of 20mm, the cross section of the supporting beam connector is U-shaped, the height of the supporting beam connector is 20cm, the width of the supporting beam connector is 10cm, and the supporting beam connector is sleeved at the top ends of the first steel plate pile (1) and the second steel plate pile (2); the cross section of the supporting beam sliding groove (52) is in a T shape, the height is 20mm, and the width is 16 cm.
The sliding support column (32) is formed by rolling a steel pipe with the diameter of 100mm, a support column sliding plate (53) at the top end is connected with a support beam sliding groove (52) of the top support beam (25), and the bottom end is vertically welded and connected with a support column base plate (54). Wherein, the support column sliding plate (53) and the support column bottom plate (54) are rolled by steel plates with the thickness of 10 mm.
The pressure control body (33) adopts a 10-ton hydraulic jack, and the bottom surface and the top surface are respectively connected with the compact pressing plate (34) and the support column bottom plate (54); the compact pressing plate (34) is formed by rolling a steel plate with the thickness of 2 mm.
The cross section of the weir crest drainage ditch (35) is trapezoidal, the bottom width is 20cm, the height is 20cm, and crushed gravel materials are filled in the weir crest drainage ditch (35).
The anti-filtering water-resisting layer (36) is made of coarse sand materials and is 5cm thick.
The prefabricated pressing plate (38) is formed by sticking PVC strips, has the width of 10cm, and is laid on the top surface of the greening planting soil (37) in a grid shape; the green planting soil (37) adopts plant-growing concrete.
The pile top crown beam (39) is formed by rolling a steel plate with the thickness of 2mm, the cross section of the pile top crown beam is H-shaped, a screw hole connected with a crown beam connecting bolt (40) is formed in the side wall of the pile top crown beam (39), and the side wall facing a water body is vertically welded and connected with a sleeve connecting beam (41); the sleeve connecting beam (41) is made of steel plates with the thickness of 10mm and is arranged along the longitudinal direction of the pile top crown beam (39) at intervals of 5 m.
The crown beam connecting bolt (40) is composed of a high-strength screw rod with the diameter of 20mm and a bolt.
The connecting sleeve (42) comprises 2-5 sections of telescopic pipe sections (55) with continuously changed diameters and 1 section of fixed pipe section (56), and is formed by rolling steel pipes, and a limit top baffle (57) and a limit bottom baffle (31) are respectively arranged at two ends of each telescopic pipe section (55); the limiting bottom baffle (31) and the limiting top baffle (57) are both formed by rolling steel plates with the thickness of 10 mm.
The wave-proof pressure plate (44) adopts a foam plate with the thickness of 20 mm; the oil blocking rope hanging rope (43) and the oil blocking rope (45) are hemp ropes with the diameter of 30 mm.
The cross section of the crown beam connecting groove (47) is rectangular, and the width of the crown beam connecting groove is 50 mm.
The baffle connecting rod (48) is formed by rolling a screw rod with the diameter of 20mm, and the two ends of the baffle connecting rod are fastened through nuts after penetrating through the connecting rod positioning plate (49); the connecting rod positioning plate (49) is formed by rolling a steel plate with the thickness of 2mm and is welded with the heightening baffle plate (46) and the pile top crown beam (39); the heightening baffle (46) is formed by rolling a steel plate with the thickness of 10 mm.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.

Claims (10)

1. A construction method of an ecological steel sheet pile island-building cofferdam is characterized in that: the method comprises the following construction steps:
1) construction preparation: determining the plane positions of the first steel sheet pile (1), the second steel sheet pile (2) and the third steel sheet pile (3), and preparing materials and devices required by construction;
2) and (3) guiding and inserting the steel sheet piles: inserting a row of guide steel sheet piles (6) into a foundation soil body (5) at two sides of an inserting position where a first steel sheet pile (1), a second steel sheet pile (2) and a third steel sheet pile (3) are inserted, arranging a positioning clamping plate (7) at the top ends of the two rows of guide steel sheet piles (6), adjusting the plane position of the positioning clamping plate (7) through a clamping plate bolt (8), sequentially driving and constructing the first steel sheet pile (1), the second steel sheet pile (2) and the third steel sheet pile (3) by adopting a steel sheet pile inserting device, sequentially penetrating a transverse anchor backing plate (10) of the first steel sheet pile (1), the second steel sheet pile (2) and the third steel sheet pile (3) through a transverse tie bar (9), and applying transverse fastening tension to the transverse tie bar (9); opposite-pulling anchor beams (13) are respectively arranged on the sides of the first steel sheet pile (1) and the second steel sheet pile (2) departing from the clay filling layer (12), and opposite-pulling anchor bars (14) are arranged between the opposite-pulling anchor beams (13); arranging a tie bar supporting plate (15) on the side of the third steel sheet pile (3) facing the water body, firmly connecting an anchor bar connecting plate (17) with a foundation soil body (5) through an uplift anchor bar (16), arranging an uplift grouting body (19) on the outer side of the uplift anchor bar (16) through grouting, and arranging a position control tie bar (20) between the tie bar supporting plate (15) and the anchor bar connecting plate (17);
3) laying an anti-seepage geomembrane and a riprap counter-pressure body: an anti-seepage geomembrane (21) is arranged on the side, away from the water body, of the third steel sheet pile (3), and a riprap counter-pressure body (23) is arranged at the joint of the third steel sheet pile (3) and the foundation soil body (5);
4) construction of an in-situ cured layer: adopting cement mortar or cement paste to solidify the foundation soil body (5) between the first steel sheet pile (1) and the second steel sheet pile (2) to form an in-situ solidified layer (24);
5) clay filling layer construction: a top supporting beam (25) is arranged between the first steel sheet pile (1) and the second steel sheet pile (2), a balance supporting plate (28) is arranged on the side, facing the water body, of the first steel sheet pile (1), a pressure-weight body connecting plate (29) is arranged at the joint of the second steel sheet pile (2) and the foundation soil body (5), and a balance pressure-weight body (30) is arranged on the pressure-weight body connecting plate (29); filling a clay filling layer (12) on the upper surface of the in-situ cured layer (24), firstly adjusting the plane position of a sliding support column (32), connecting the sliding support column (32) to a top support beam (25) in a sliding manner, and then applying a jacking force to a compaction pressing plate (34) arranged on the clay filling layer (12) through a pressure control body (33) at the bottom of the sliding support column (32) so as to ensure that the compactness of the clay filling layer (12) meets the set requirement; after the clay filling layer (12) is filled to a set elevation, digging a weir top drainage ditch (35) on the side, close to the first steel sheet pile (1), of the top surface of the clay filling layer (12), and enabling the weir top drainage ditch (35) to be communicated with external water pumping equipment;
6) and (3) greening soil layer construction: firstly, paving a reverse filtration water-resisting layer (36) on the top surface of the clay filling layer (12), paving green planting soil (37), and arranging a prefabricated pressing plate (38) on the top surface of the green planting soil (37);
7) arranging a wave-proof pressing plate and an oil blocking rope: a pile top crown beam (39) is arranged at the top ends of the first steel sheet pile (1) and the third steel sheet pile (3) along the length direction of the cofferdam in a through manner, a sleeve connecting beam (41) is connected to the pile top crown beam (39), a connecting sleeve (42) and an oil blocking rope lifting rope (43) are arranged on the lower surface of the sleeve connecting beam (41), and a wave-proof pressing plate (44) at the bottom end of the connecting sleeve (42) and an oil blocking rope (45) at the bottom end of the oil blocking rope lifting rope (43) are enabled to freely fall to the upper surface of a water body outside the cofferdam;
8) heightening a baffle plate and arranging: when the water level outside the cofferdam suddenly rises, the bottom end of the heightening baffle (46) is inserted into a crown beam connecting groove (47) of a pile top crown beam (39), a baffle connecting rod (48) is firmly connected with a connecting rod positioning plate (49), two ends of the baffle connecting rod (48) penetrate through the connecting rod positioning plate (49) and then are fixed through nuts, and the connecting rod positioning plate (49) is connected with the heightening baffle (46) in a welding mode.
2. The construction method of the ecological steel sheet pile island-building cofferdam according to claim 1, characterized in that in step 2), one end of the clamp bolt (8) is connected with the positioning clamp (7) through the screw end hinge (50), and the other end passes through the guide steel sheet pile (6).
3. The construction method of the ecological steel sheet pile island-building cofferdam according to claim 1, characterized in that in step 2), the side wall of the uplift anchor bar (16) is provided with a grout overflow hole (51), and the tie bar supporting plate (15) and the anchor bar connecting plate (17) are connected with the position-controlling tie bar (20) through the tie bar connecting bolt (18).
4. The construction method of the ecological steel sheet pile island-building cofferdam according to claim 1, characterized in that in step 2), the lateral sides of the first steel sheet pile (1), the second steel sheet pile (2) and the third steel sheet pile (3) are provided with transverse anchor pads (10), tie bar through holes (11) are formed on the transverse anchor pads (10), and the transverse tie bars (9) sequentially pass through the tie bar through holes (11) on the transverse anchor pads (10) of the first steel sheet pile (1), the second steel sheet pile (2) and the third steel sheet pile (3).
5. The construction method of the ecological steel sheet pile island-building cofferdam according to claim 1, wherein in step 5), both ends of the top bracing beam (25) are provided with bracing beam connectors (26) connected with the first steel sheet pile (1) and the second steel sheet pile (2), and the bracing beam connectors (26) are firmly connected with the first steel sheet pile (1) and the second steel sheet pile (2) through connector fastening bolts (27).
6. The construction method of the ecological steel sheet pile island-building cofferdam according to claim 1, characterized in that in step 5), the top bracing beam (25) is provided with a bracing beam chute (52),
the strut sliding plate (53) at the top end of the sliding strut (32) is connected with the strut sliding groove (52), and the bottom end is vertically connected with the strut bottom plate (54).
7. The construction method of the ecological steel sheet pile island-building cofferdam according to claim 6, characterized in that in step 5), the ballast weight connecting plate (29) is arranged on the side away from the in-situ cured layer (24), and the bottom surface and the top surface of the pressure control body (33) are respectively connected with the compact pressing plate (34) and the bracing column bottom plate (54).
8. The construction method of the ecological steel sheet pile island-building cofferdam according to claim 1, characterized in that in step 7), the pile top crown beam (39) is firmly connected with the first steel sheet pile (1) and the third steel sheet pile (3) connected through the crown beam connecting bolt (40), and the sleeve connecting beams (41) are uniformly arranged along the pile top crown beam (39) at intervals in the longitudinal direction.
9. The construction method of the ecological steel sheet pile island-building cofferdam according to claim 1, wherein in step 7), the connecting sleeve (42) comprises a telescopic pipe section (55) and a fixed pipe section (56) with continuously changing diameters, and a limit top baffle (57) and a limit bottom baffle (31) are respectively arranged at two ends of the telescopic pipe section (55).
10. An ecological steel sheet pile island-building cofferdam, which is characterized in that the ecological steel sheet pile island-building cofferdam is obtained by construction according to the construction method of the ecological steel sheet pile island-building cofferdam of any one of the claims 1 to 9.
CN202011095202.0A 2020-10-14 2020-10-14 Ecological steel sheet pile island-building cofferdam and construction method Active CN112227391B (en)

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Publication number Priority date Publication date Assignee Title
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
CN107299630A (en) * 2017-08-17 2017-10-27 浙江交工集团股份有限公司 A kind of deep & thick silt matter riverbed piping lane crosses the river double steel plate pile cofferdam structure and construction method
CA3061782A1 (en) * 2018-11-15 2020-05-15 Aquapera Industries Inc. Cofferdam system and method of installing the same
CN110439012B (en) * 2019-07-22 2021-02-26 安徽省交通建设股份有限公司 Construction method of wading open-cut foundation pit composite steel sheet pile cofferdam
CN110924313B (en) * 2019-12-25 2021-08-10 核工业西南建设集团有限公司 Construction method of bridge foundation cofferdam
CN111139849B (en) * 2020-01-03 2021-04-20 浙江大学城市学院 Construction method of deep-buried underwater bearing platform steel sheet pile cofferdam

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