CN115928771A - Steel-concrete filling cofferdam construction method based on abrupt slope of whole rock stratum in lake and reservoir area - Google Patents
Steel-concrete filling cofferdam construction method based on abrupt slope of whole rock stratum in lake and reservoir area Download PDFInfo
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- CN115928771A CN115928771A CN202211503878.8A CN202211503878A CN115928771A CN 115928771 A CN115928771 A CN 115928771A CN 202211503878 A CN202211503878 A CN 202211503878A CN 115928771 A CN115928771 A CN 115928771A
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Abstract
The invention relates to a construction method of a steel-concrete filling-up cofferdam based on a steep slope of a whole rock stratum in a lake and reservoir area, which comprises the following steps: the rotary excavating machine is used for conducting hole leading on a bed by bedrock on the bank → vibrating sinking of the steel pipe pile → pile top leveling → pile top steel plate laying to serve as a temporary construction platform → the rotary excavating machine is driven into the temporary construction platform to conduct hole leading on the cofferdam steel pipe pile → vibrating sinking of the cofferdam steel pipe pile → steel pipe pile drawing by using a steel waist beam outside the cofferdam steel pipe pile → sand filling inside the cofferdam steel pipe pile → waterproof geotextile laying from the cofferdam top to the bed → pulling of redundant steel pipe pile → cofferdam concrete pouring → foundation pit excavation construction; the invention has the beneficial effects that: by using the construction method, a temporary construction platform can be rapidly built, and concrete is used as the cofferdam main body, so that the construction progress is accelerated, the water retaining performance of the foundation pit is improved, the safety of foundation pit construction is improved, and the construction cost is saved.
Description
Technical Field
The invention belongs to the technical field of cofferdam construction of foundation pits in construction engineering, and particularly relates to a construction method of a steel-concrete filling cofferdam based on a steep slope of a whole rock stratum in a lake and reservoir area.
Background
Because the foundation ditch closes on the waters, in foundation ditch one corner got into the waters scope, need carry out the repaired mouth cofferdam to the foundation ditch breach. The foundation rock on land to the bottom of a river bed is a steep slope, the foundation rock is medium stroke fine sandstone and has high hardness, the foundation pit excavation operation is carried out after backfilling to be more than 0.5m above the water surface by filling a gap with backfill in the traditional method, large-area backfilling is needed for ensuring the safety and the water-resisting capability of the foundation pit, and the filling encroachment is forbidden in the current domestic protective water area, so that the method cannot be implemented.
Because the hardness of bedrock is high, and the rock wall is steep and close to vertical, the traditional method fills in two defects and directly drives and establishes a steel pipe pile and a steel sheet pile cofferdam, needs to use a large-scale buoyancy tank as a construction platform, and generally comprises the following working steps: the buoyancy tank enters the field and is assembled with the water, the rotary excavating machine and the steel pipe pile pulling machine are driven on the buoyancy tank → the buoyancy tank is moved to the positioning point of the cofferdam → the guide hole of the rotary excavating machine → the steel pipe pile is vibrated to sink → the support waist beam is erected → the water pumping → the foundation pit is excavated. Because the rotary excavating machine and the pulling machine are heavy machines, a large buoyancy tank is needed to enter a field, the large buoyancy tank is high in entering and exiting cost and difficult to control, the large buoyancy tank needs to be moved for many times, the construction period is long, the large-tonnage machines such as the rotary excavating machine and the pulling machine need solid and stable foundations, the potential safety hazard of the nearby water operation on the buoyancy tank is large, and the construction safety risk is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a steel-concrete filling cofferdam construction method based on the steep slope of the whole rock stratum in the lake and reservoir area, so that the full stroke rock foundation pit water-facing gap in the water-facing whole mountain area is closed, the safe excavation construction of the foundation pit is ensured, the filling construction speed is improved, the usage amount of profile steel is reduced, the water retaining effect of the cofferdam is improved, the safety of the foundation pit construction is ensured, the construction period is ensured, and the cost is saved.
The invention aims to complete the construction method of the steel-concrete filling cofferdam based on the steep slope of the whole rock stratum of the lake and reservoir area by the following technical scheme, and the construction method of the steel-concrete filling cofferdam comprises the following steps:
s1, determining the position of a gap of a cofferdam to be repaired for a foundation pit, driving a rotary excavating machine onto a shore bedrock, and sequentially guiding holes for a river bed, wherein the guide holes are used for guiding steel pipe piles to the bottom of the river bed;
s2, driving the rotary excavating machine to the onshore bedrock, after a row of holes are led along the bank edge of the onshore bedrock by the rotary excavating machine, sinking the steel pipe pile into the holes by vibration of a vibration hydraulic hammer of the rotary excavating machine, and sequentially circulating the steps of leading the holes of the rotary excavating machine and sinking the steel pipe pile into the holes by the rotary excavating machine until a full steel pipe pile structure with a cofferdam gap needing to be filled is formed;
s3, leveling each steel pipe pile on the full steel pipe pile, and paving a steel plate on the pile top to serve as a temporary construction platform;
s4, driving the rotary excavating machine onto the temporary construction platform, and sequentially guiding holes in the cofferdam along the outer side edge of the full steel pipe pile;
s5, driving the driving and pulling machine onto a temporary construction platform, after the rotary excavating machine guides holes in a row along the outer edges of the full steel pipe piles, at the moment, vibrating and sinking the cofferdam steel pipe piles into the guide holes through a vibrating hydraulic hammer of the driving and pulling machine, then continuing to guide holes along the outer edges of the row of cofferdam steel pipe piles which are just sunk, and sinking the cofferdam steel pipe piles into the rotary excavating machine through the driving and pulling machine to form a cofferdam;
s6, welding profile steel waist beams and a plurality of brackets on the outer sides of the two rows of cofferdam steel pipe piles, wherein the brackets are positioned below the profile steel waist beams, and the cofferdam is pulled and tied through a counter-pull screw rod between the two profile steel waist beams;
s7, pouring coarse sand into each cofferdam steel pipe pile;
s8, laying waterproof geotextile from the top of the cofferdam to a riverbed, fixing the top of the cofferdam by using a steel chisel, and weighting the waterproof geotextile positioned at the bottom of the riverbed by using a sandbag;
s9, removing the steel plates, and sequentially removing the steel pipe piles in the full steel pipe piles through a vibration hydraulic hammer of the striking and pulling machine;
and S10, pouring concrete into the cofferdam by using a guide pipe to finish the foundation pit repaired opening cofferdam.
The beneficial effects of the invention are as follows: by using the construction method, a temporary construction platform can be quickly built, and concrete is used as the main body of the cofferdam, so that the construction progress is accelerated, the water retaining performance of the foundation pit is improved, the safety of foundation pit construction is improved, and the construction cost is saved; the full stroke of the fossil rock foundation pit that faces water in the mountain area faces water is sealed, guarantees foundation pit safe excavation construction, improves the joint coating construction speed, reduces the shaped steel use amount, improves the manger plate effect of cofferdam.
Preferably, according to the step S4, when the rotary excavator conducts hole guiding on the cofferdam along the outer edge of the full steel pipe pile, hole guiding is also needed at the connection part of the two sides of the cofferdam and the onshore bedrock, and the hole guiding is located in the onshore bedrock; therefore, the water retaining capacity of the joint of the cofferdam and the onshore bedrock can be further enhanced.
Preferably, in the step S5, sinking the cofferdam steel pipe pile into the pilot hole in the shore bedrock by vibrating through a vibrating hydraulic hammer of a pulling machine; the stability after the cofferdam is formed is better, and the cofferdam is not easy to collapse.
Preferably, the steel waist beam comprises two channel steels, the two channel steels are respectively fixed at the outer sides of the two rows of cofferdam steel pipe piles in a welding mode, and the bottoms of the two channel steels are distributed oppositely and provided with insertion seams for inserting the split screws; thus, the construction and the installation between the split screw and the section steel waist beam are convenient, and the use cost of the material is lower.
Preferably, the counter-pulling screw rods are arranged in a plurality of strips and are distributed at equal intervals in sequence along the length direction of the cofferdam, and the counter-pulling screw rods penetrate through the penetration seams and are positioned in the gaps between the adjacent steel pipe piles of the cofferdam; make the cofferdam when pouring concrete like this, be difficult to burst and make the construction appear the risk of collapsing for the intensity and the wholeness of cofferdam are better.
Preferably, the section steel wale is positioned at the top of the outer side of the cofferdam steel pipe pile; therefore, the strength of the upper end of the cofferdam can be guaranteed, and the cofferdam is not easy to deform.
Preferably, the outer side contour of the full steel pipe pile is consistent with the contour of the cofferdam; therefore, after the full steel pipe pile construction is finished, the contour of the cofferdam can be determined according to the outside contour of the full steel pipe pile, the construction is convenient, and the construction efficiency is greatly improved.
Preferably, the height of the top of the cofferdam is 50 to 80cm higher than the height of the onshore bedrock; therefore, the safety and the water-resisting capability of the foundation pit can be ensured.
Drawings
FIG. 1 is a schematic structural diagram of a first construction step of the present invention.
FIG. 2 is a schematic structural view of the second construction step of the present invention.
FIG. 3 is a schematic structural diagram of a third construction step of the present invention.
FIG. 4 is a schematic structural diagram of a fourth construction step of the present invention.
Fig. 5 is a schematic structural view of a fifth construction step of the present invention.
Fig. 6 is a schematic structural view of a fifth construction step of the present invention.
Fig. 7 is a schematic structural diagram of construction steps six and seven of the present invention.
Fig. 8 is a schematic structural view of a construction step eight of the present invention.
Fig. 9 is a schematic structural view of a construction step nine of the present invention.
Fig. 10 is a schematic structural view of a construction step ten of the present invention.
Fig. 11 is a schematic view of a forming structure of a notch cofferdam according to the construction of the present invention.
The reference numbers in the figures are respectively: 1. a notch; 2. a rotary digging machine; 3. onshore bedrock; 4. leading holes; 5. steel pipe piles; 6. a beating and drawing machine; 7. steel pipe piles in full hall; 8. a steel plate; 9. coffering; 10. cofferdam steel pipe piles; 11. a profiled steel wale; 12. a bracket; 13. oppositely pulling the screw rod; 14. waterproof geotextile; 15. steel chisel; 16. a sand bag; 17. a conduit; 18. inserting the seam; 19. concrete; 61. vibrating a hydraulic hammer; 11-1 and channel steel.
Detailed Description
The invention will be described in detail below with reference to the following drawings: the construction method of the steel-concrete filling cofferdam comprises the following steps: as shown in the accompanying drawings of figures 1 to 11,
s1, firstly determining the position of a gap 1 of a cofferdam to be repaired for a foundation pit, then driving a rotary excavating machine 2 to a shore bedrock 3, and sequentially carrying out hole leading 4 on a riverbed, wherein the hole leading 4 is used for leading a steel pipe pile 5 to the bottom of the riverbed; the onshore bedrock 3 is the existing water area external bedrock and serves as a construction platform, so that the construction is safer;
s2, driving the driving and pulling machine 6 onto the onshore bedrock 3, after the rotary excavating machine 2 drives the holes 4 along the shoreside of the onshore bedrock 3 in a row, sinking the steel pipe piles 5 into the holes 4 in a vibrating manner through a vibrating hydraulic hammer 61 of the driving and pulling machine 6, and sequentially circulating the steps of sinking the steel pipe piles 5 into the holes 4 of the rotary excavating machine 2 and the driving and pulling machine 6 until a full steel pipe pile 7 structure of the cofferdam gap 1 needing to be filled is formed; the construction step can meet the requirement of forming the subsequent cofferdam, and the subsequent construction efficiency is greatly improved;
s3, leveling each steel pipe pile 5 on the full steel pipe pile 7, and paving a steel plate 8 on the pile top to serve as a temporary construction platform; compared with the prior art, the floating box on water is completely omitted, and the safety and the construction efficiency are greatly improved;
s4, driving the rotary excavating machine 2 into the temporary construction platform, and sequentially guiding holes 4 in the cofferdam 9 along the outer side edge of the full steel pipe pile 7;
s5, driving the digging machine 6 onto a temporary construction platform, after the rotary digging machine 2 draws holes 4 along the outer edges of full steel pipe piles 7 in a row, sinking the cofferdam steel pipe piles 10 into the drawing holes 4 in a vibrating mode through a vibrating hydraulic hammer 61 of the digging machine 6, continuing drawing the holes 4 along the outer edges of a row of cofferdam steel pipe piles 10 which are just sunk in a vibrating mode through the rotary digging machine 2, and sinking the cofferdam steel pipe piles 10 into the cofferdam steel pipe piles 10 through the digging machine 6 to form a cofferdam 9; the width of the cofferdam 9 is the distance between two rows of cofferdam steel pipe piles 10, and based on the erection of the full-framing steel pipe piles 7, the outer side contour of the full-framing steel pipe piles 7 is consistent with the contour of the cofferdam 9, so that the cofferdam 9 is formed more quickly, and the contour can meet the construction requirement;
s6, both the outer sides of the two rows of cofferdam steel pipe piles 10 are welded with section steel waist beams 11 and a plurality of brackets 12, the brackets 12 are located below the section steel waist beams 11, and the cofferdam 9 is pulled and knotted between the two section steel waist beams 11 through a counter-pull screw 13;
s7, pouring coarse sand into each cofferdam steel pipe pile 10; coarse sand is poured to enable the strength of each cofferdam steel pipe pile 10 to be stronger, and therefore the strength and the stability of the cofferdam are better;
s8, laying waterproof geotextile 14 from the top of the cofferdam 9 to the riverbed, fixing the top of the cofferdam 9 by using a steel chisel 15, and weighting the waterproof geotextile 14 at the bottom of the riverbed by using a sandbag 16; this prevents the waterproof geotextile 14 from being kneaded into a mass when concrete is poured, which cannot prevent the concrete grout from leaking;
s9, removing the steel plates 8, and sequentially removing the steel pipe piles 5 in the full steel pipe pile 7 through the vibration hydraulic hammer 61 of the driving and pulling machine 6;
and S10, pouring concrete 19 into the cofferdam 9 by using a guide pipe 17 to finish the foundation pit repaired mouth cofferdam.
According to the step S4, when the rotary excavating machine 2 conducts hole guiding on the cofferdam 9 along the outer edge of the full steel pipe pile 7, hole guiding 4 is needed at the connection part of the two sides of the cofferdam 9 and the onshore bedrock 3, and the hole guiding 4 is positioned in the onshore bedrock 3; and (5) vibrating and sinking the cofferdam steel pipe pile 10 into the pilot hole 4 in the shore bedrock 3 through a vibrating hydraulic hammer 61 of the pulling and driving machine 6 in the step S5.
The section steel wale 11 comprises two channel steels 11-1, the two channel steels 11-1 are respectively fixed on the outer sides of the two rows of cofferdam steel pipe piles 10 in a welding mode, and the bottoms of the two channel steels 11-1 are distributed oppositely and provided with penetrating seams 18 for penetrating the counter-pulling screw rods 13; the counter-pulling screw rods 13 are arranged in a plurality of strips and are sequentially distributed at equal intervals along the length direction of the cofferdam 9, the counter-pulling screw rods 13 penetrate through the insertion seams 18 and are positioned in the gaps between the adjacent steel pipe piles 10 of the cofferdam, two nut seats are screwed at two ends of the counter-pulling screw rods 13 respectively in a threaded screwing mode, and the integrity of the cofferdam is better through the screwing of the nut seats and the counter-pulling screw rods 13.
The shaped steel wale 11 is located the outside top of cofferdam steel-pipe pile 10, and shaped steel wale 11 extends to on the cofferdam steel-pipe pile 10 on the basement rock 3 of bank all the time, makes the wholeness between cofferdam 9 and the basement rock 3 of bank better like this to waterproof performance is also better.
The height of the top of the cofferdam 9 is 50-80 cm higher than that of the onshore bedrock 3, and the water-resisting property in the excavation process of the foundation pit can be met.
The present invention is not limited to the above embodiments, and any changes in the shape or material composition, or any changes in the structural design provided by the present invention, are all modifications of the present invention, and should be considered to be within the scope of the present invention.
Claims (8)
1. A construction method of a steel-concrete filling cofferdam based on a full-rock stratum steep slope in a lake and reservoir area is characterized by comprising the following steps: the construction method of the steel-concrete filling cofferdam comprises the following steps:
s1, determining the position of a gap (1) of a foundation pit needing to be filled with a cofferdam, driving a rotary excavating machine (2) onto a shore bedrock (3), and sequentially guiding holes (4) to a riverbed, wherein the guiding holes (4) are used for guiding steel pipe piles (5) to the bottom of the riverbed;
s2, driving the digging and pulling machine (6) to the onshore bedrock (3), after the holes (4) are led in a row along the bank edge of the onshore bedrock (3) along the rotary digging machine (2), sinking the steel pipe pile (5) into the holes (4) through the vibration hydraulic hammer (61) of the digging and pulling machine (6), and sequentially circulating the steps of leading the holes of the rotary digging machine (2) and sinking the steel pipe pile (5) with the digging and pulling machine (6) until a full steel pipe pile (7) structure needing to be filled with the cofferdam gap (1) is formed;
s3, leveling each steel pipe pile (5) on the full steel pipe pile (7), and paving a steel plate (8) on the pile top to serve as a temporary construction platform;
s4, driving the rotary excavating machine (2) onto the temporary construction platform, and sequentially guiding the cofferdam (9) along the outer side edge of the full steel pipe pile (7) to form a hole (4);
s5, driving the digging machine (6) to a temporary construction platform, after the rotary digging machine (2) draws holes (4) in a row along the outer side edge of the full steel pipe pile (7), sinking the cofferdam steel pipe pile (10) into the drawing holes (4) in a vibrating manner through a vibrating hydraulic hammer (61) of the digging machine (6), continuing drawing the holes (4) along the outer side edge of the row of the cofferdam steel pipe pile (10) which is just sunk in the rotary digging machine (2) again, and sinking the cofferdam steel pipe pile (10) into the cofferdam steel pipe pile (10) through the digging machine (6) to form a cofferdam (9);
s6, both the outer sides of the two rows of cofferdam steel pipe piles (10) are welded with section steel waist beams (11) and a plurality of brackets (12), the brackets (12) are located below the section steel waist beams (11), and the cofferdam (9) is pulled and knotted between the two section steel waist beams (11) through a counter-pull screw rod (13);
s7, pouring coarse sand into each cofferdam steel pipe pile (10);
s8, laying waterproof geotextile (14) from the top of the cofferdam (9) to the riverbed, fixing the top of the cofferdam (9) by using a steel chisel (15), and weighting the waterproof geotextile (14) at the bottom of the riverbed by using a sandbag (16);
s9, removing the steel plate (8), and sequentially removing the steel pipe piles (5) in the full steel pipe pile (7) through a vibration hydraulic hammer (61) of a striking and pulling machine (6);
and S10, pouring concrete (19) in the cofferdam (9) by using a conduit (17) to finish the foundation pit repaired cofferdam.
2. The construction method of the steel-concrete filling-up cofferdam based on the steep slope of the whole rock stratum in the lake and reservoir area as claimed in claim 1, characterized in that: according to the step S4, when the rotary excavator (2) conducts hole guiding on the cofferdam (9) along the outer edge of the full steel pipe pile (7), hole guiding (4) is needed at the connection part of the two sides of the cofferdam (9) and the onshore bedrock (3), and the hole guiding (4) is located in the onshore bedrock (3).
3. The construction method of the steel-concrete filling-up cofferdam based on the steep slope of the whole rock stratum in the lake and reservoir area as claimed in claim 2, characterized in that: and according to the step S5, sinking the cofferdam steel pipe pile (10) into the pilot hole (4) in the onshore bedrock (3) through the vibration hydraulic hammer (61) of the driving and pulling machine (6).
4. The construction method of the steel-concrete filling-up cofferdam based on the steep slope of the whole rock stratum in the lake and reservoir area as claimed in claim 1, characterized in that: the structural steel wale (11) comprises two channel steel (11-1), the two channel steel (11-1) are respectively fixed on the outer sides of the two rows of cofferdam steel pipe piles (10) in a welding mode, the bottoms of the two channel steel (11-1) are distributed oppositely, and penetrating seams (18) for the penetration of the counter-pulling screw rods (13) are reserved.
5. The construction method of the steel-concrete filling-up cofferdam based on the steep slope of the whole rock stratum in the lake and reservoir area as claimed in claim 4, characterized in that: the counter-pulling screw rods (13) are arranged in a plurality and are distributed at equal intervals in sequence along the length direction of the cofferdam (9), and the counter-pulling screw rods (13) penetrate through the insertion seams (18) and are positioned in the gaps between the adjacent cofferdam steel pipe piles (10).
6. The construction method of the steel-concrete filling-up cofferdam based on the steep slope of the whole rock stratum in the lake and reservoir area as claimed in claim 1 or 4, characterized in that: the section steel wale (11) is located at the top of the outer side of the cofferdam steel pipe pile (10).
7. The steel-concrete filling-up cofferdam construction method based on the full-rock stratum steep slope in the lake and reservoir area according to claim 1, characterized in that: the outer side contour of the full steel pipe pile (7) is consistent with the contour of the cofferdam (9).
8. The construction method of the steel-concrete filling-up cofferdam based on the steep slope of the whole rock stratum in the lake and reservoir area as claimed in claim 1, characterized in that: the height of the top of the cofferdam (9) is 50-80 cm higher than that of the onshore bedrock (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211503878.8A CN115928771A (en) | 2022-11-28 | 2022-11-28 | Steel-concrete filling cofferdam construction method based on abrupt slope of whole rock stratum in lake and reservoir area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211503878.8A CN115928771A (en) | 2022-11-28 | 2022-11-28 | Steel-concrete filling cofferdam construction method based on abrupt slope of whole rock stratum in lake and reservoir area |
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| CN115928771A true CN115928771A (en) | 2023-04-07 |
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| CN202211503878.8A Pending CN115928771A (en) | 2022-11-28 | 2022-11-28 | Steel-concrete filling cofferdam construction method based on abrupt slope of whole rock stratum in lake and reservoir area |
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- 2022-11-28 CN CN202211503878.8A patent/CN115928771A/en active Pending
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