CN116356870A - Embedded open caisson foundation and construction method thereof - Google Patents
Embedded open caisson foundation and construction method thereof Download PDFInfo
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- CN116356870A CN116356870A CN202310280489.1A CN202310280489A CN116356870A CN 116356870 A CN116356870 A CN 116356870A CN 202310280489 A CN202310280489 A CN 202310280489A CN 116356870 A CN116356870 A CN 116356870A
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- 239000004567 concrete Substances 0.000 claims abstract description 123
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 117
- 239000010959 steel Substances 0.000 claims abstract description 117
- 238000005422 blasting Methods 0.000 claims abstract description 55
- 239000011435 rock Substances 0.000 claims abstract description 48
- 238000009412 basement excavation Methods 0.000 claims abstract description 13
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 11
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- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
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- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 3
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/18—Foundations formed by making use of caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
- E02D27/525—Submerged foundations, i.e. submerged in open water using elements penetrating the underwater ground
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/80—Ground anchors
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Abstract
The invention provides an embedded open caisson foundation and a construction method thereof, the embedded open caisson foundation comprises a foundation trench arranged on a seabed rock surface, a rock mass reserved on the inner wall of the foundation trench and a steel shell concrete open caisson with a cavity in the middle embedded in the foundation trench, wherein the steel shell concrete open caisson comprises a steel open caisson, concrete in the open caisson and a reinforced concrete bearing platform, a plurality of wellholes are further arranged on the steel open caisson, the concrete in the open caisson is poured in the wellholes on the steel open caisson, the reinforced concrete bearing platform is poured on the top of a steel ring drum, the seabed rock surface comprises a first region, a second region and a third region which are distributed from top to bottom, the first region, the second region and the third region are blasted in sequence to form the foundation trench, and a fusion energy-eliminating blasting structure for reducing damage of the seabed rock surface at the bottom is used for blasting in the third region blasting. The invention applies the fusion energy blasting technology to the bridge deepwater foundation, reduces rock mass damage, simultaneously reduces the underwater blasting excavation quantity and the concrete filling quantity in the open caisson by about 1.5 square respectively, and has good economy.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to an embedded open caisson foundation and a construction method thereof.
Background
Along with the continuous increase of the depth of water, the design and construction difficulties of the deepwater foundation are obviously increased, meanwhile, the construction cost is larger and larger in proportion to the whole bridge, and the bridge deepwater foundation becomes a key factor for restricting the large-span bridge scheme and even becomes a primary factor for the feasibility of the design scheme.
For large bridge foundations in deep water bare rock or shallow coverage areas, the large bridge foundations are limited by large construction equipment, the large pile diameter pile foundations are mainly used at present, open caisson foundations are also adopted at partial working points, and the open caisson foundations are also in a starting exploration stage. However, the large-diameter bored pile foundation has the defects of small horizontal rigidity, poor horizontal resistance, long water construction period, more auxiliary facilities, high risk, high investment and the like; full-section blasting excavation is needed at the bottom of a foundation pit of the open caisson, the underwater blasting rock excavation square quantity and the concrete filling quantity in the open caisson are relatively large, the foundation pit foundation construction is set, the foundation pit excavation adopts common underwater blasting construction, the damage to the seabed rock surface is relatively large, and the bearing capacity of the seabed rock surface is affected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an embedded open caisson foundation and a construction method thereof, the embedded open caisson foundation is adopted, the underwater blasting excavation amount and the concrete filling amount in the open caisson are reduced by about 1.5 square, the economy is good, the underwater blasting adopts the overall scheme of full-section fractional drilling and sequential blasting, the precise blasting excavation of a foundation pit can be realized, the anti-focusing blasting technology is applied to the bridge deep water foundation, the underwater blasting flatness is precisely controlled, the rock mass damage is reduced, and the bearing capacity of the sea bed rock face is improved.
The specific technical scheme is as follows:
the utility model provides an embedded setting open caisson foundation, includes the foundation pit of seting up on the seabed rock face, leaves and locates the rock mass of foundation pit inner wall and inlay the steel casing concrete open caisson of taking the cavity in the centre in the foundation pit, steel casing concrete open caisson includes steel open caisson, open caisson internal concrete and reinforced concrete cushion cap, still set up a plurality of borehole on the steel open caisson, just the cavity leaves and locates the steel open caisson is inside to be used for holding the rock mass, concrete placement in the open caisson is in the borehole on the steel open caisson, reinforced concrete cushion cap pour in steel ring top, the seabed rock face includes from top to bottom distribution's region one, region two and region three, region two, region three are exploded in proper order, form the foundation pit, just adopt the blasting structure that disappears that is used for alleviating bottom seabed rock face damage when region three explodes.
Optionally, the energy-eliminating blasting structure comprises coarse sand, a high-density ball body, a detonator and a detonating tube which are arranged in a blast hole of the third area from bottom to top, wherein the detonator is connected with the detonating tube, one end of the detonating tube extends out of the blast hole, and the detonator is blocked in the blast hole through a blocking object.
Optionally, the steel shell concrete open caisson is provided with a main anchor cable assembly, the main anchor cable assembly comprises a main concrete anchor, a main anchor cable, a guide wheel and a driving device, the main concrete anchor is fixed on a seabed, the guide wheel is arranged on the steel shell concrete open caisson, one side of the main anchor cable is fixed on the main concrete anchor, the main anchor cable bypasses a plurality of guide wheels and then is fixed with the main concrete anchor on the other side, and the driving device is arranged on the steel shell concrete open caisson and used for adjusting the inclination of the steel shell concrete open caisson, and the output end of the driving device is connected with the guide wheel.
Optionally, the side anchor cable assembly comprises an auxiliary concrete anchor, a side anchor cable and a hydraulic continuous jack, wherein the auxiliary concrete anchor is fixed on a seabed, the hydraulic continuous jack is fixed on the steel shell concrete open caisson, one end of the side anchor cable is fixed at the output end of the hydraulic continuous jack, and the other end of the side anchor cable is fixed on the auxiliary concrete anchor.
Optionally, still be provided with the leveling subassembly in the steel-shelled concrete open caisson, the leveling subassembly includes leveling support column, spacing hoop, counter-force seat and jack, spacing hoop is fixed on the steel-shelled concrete open caisson, the leveling support column pass behind the spacing hoop butt in the foundation ditch diapire, the counter-force seat sets up on the leveling support column, the jack sets up on the counter-force seat, just the output of jack with the up end butt of steel-shelled concrete open caisson.
A construction method for setting an open caisson foundation in an embedded manner comprises the following steps:
s1, underwater blasting excavation and substrate base cleaning: firstly, carrying out underwater trench drilling blasting of a free surface in a first area, then carrying out underwater one-step trench blasting of two free surfaces in a second area by adopting a hole bottom continuous blasting structure, after the reef blasting and slag removal work of the first area and the second area are completed, carrying out blasting by adopting a fusion energy removing blasting structure in a third area, then carrying out slag removal again, finally carrying out rock surface flatness detection on the blasted area, and treating the parts which cannot meet the requirements until the design requirements are met;
s2, manufacturing a steel open caisson: manufacturing steel block parts of the steel shell concrete open caisson in a factory in a blocking manner, pouring 2m high concrete in the cutting edge feet after the bottom section steel shell concrete open caisson foundation block parts are spliced, roughening the top surface and removing slag, and continuously splicing the steel open caisson to form floating sections;
s3, floating, positioning and sinking of the steel open caisson: after the slag is removed by the explosion of the seabed, the steel open caisson is carried to the pier position in a floating way, the steel open caisson is irrigated to sink and land, and the main anchor cable component and the side anchor cable component are adopted for positioning;
s4, leveling the steel open caisson: the steel open caisson realizes falling leveling through the leveling component;
s5, performing underwater concrete construction on the steel open caisson, the well wall and the partition wall: after the steel open caisson is positioned, pouring concrete in the open caisson in the steel open caisson, and pouring a reinforced concrete bearing platform at the top of the steel open caisson;
s6, construction of a bearing platform: binding bearing platform reinforcing steel bars and pouring bearing platform concrete in layers.
Optionally, the annular outer ring of the steel shell concrete open caisson is arranged on a breeze element An Danyan, and the annular inner ring of the steel shell concrete open caisson is arranged on a weak breeze An Danyan.
Optionally, before underwater concrete construction, the steel shell concrete open caisson is filled with rubble within a certain height range of the foundation pit at the outer side.
Compared with the prior art, the invention has the beneficial effects that:
(1) The embedded deep water foundation form of the open caisson is adopted, so that the underwater blasting excavation amount and the concrete filling amount in the open caisson are reduced by about 1.5 square meters respectively, and the economy is good;
(2) The whole section of the underwater blasting adopts the overall scheme of multiple drilling and sequential blasting, so that the precise blasting excavation of the foundation pit can be realized, the fusion energy eliminating blasting technology is applied to the bridge deep water foundation, the underwater blasting flatness is precisely controlled, the rock damage is reduced, and the bearing capacity of the sea bed rock surface is improved;
(3) The annular embedded sunk well foundation is adopted, the annular outer ring with larger stress is placed in micro-weathered England rock, the inner ring with smaller stress is placed in weak-weathered England rock, and the bare rock bearing capacity of different lithologies can be fully exerted.
(4) The main anchor cable pulling assembly, the side anchor cable pulling assembly and the leveling assembly are combined to realize rapid and accurate implantation of the open caisson.
Drawings
FIG. 1 is a schematic diagram of a front view structure of an embedded open caisson foundation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a seabed rock face structure embedded in a foundation of an open caisson according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a continuous blasting structure of a bottom of a hole in an embedded open caisson foundation according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a steel ring cylinder and a cross partition wall embedded in an open caisson foundation according to an embodiment of the present invention;
FIG. 5 is a schematic view showing the structure of a main anchor line assembly and a side anchor line assembly embedded in a sunk well foundation according to the embodiment of the present invention;
FIG. 6 is a schematic view of a main anchor line assembly embedded in a caisson foundation according to an embodiment of the present invention;
FIG. 7 is a schematic top view of a leveling assembly in an embedded open caisson foundation according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a front view structure of a leveling assembly in an embedded open caisson foundation according to an embodiment of the present invention.
In the accompanying drawings: 1. a seabed rock surface; 11. region one; 12. a second region; 13. region three; 2. a base groove; 20. a rock mass; 3. steel shell concrete open caisson; 30. a wellbore; 31. a steel ring cylinder; 32. a cross partition wall; 4. a main anchor line assembly; 41. a main concrete anchor; 42. a main anchor cable; 43. a guide wheel; 5. a side anchor pull cable assembly; 51. a secondary concrete anchor; 52. an edge anchor cable; 6. a leveling assembly; 61. leveling the support column; 62. a limit hoop; 63. a counterforce seat; 7. a plug; 70. a blast hole; 71. detonating tube; 72. a detonator; 73. a high density sphere; 74. coarse sand.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
The embedded open caisson foundation provided by the invention, referring to fig. 1, the embedded open caisson foundation comprises a base groove 2 formed on a seabed rock face 1, a rock mass 20 reserved on the inner wall of the base groove 2 and a steel shell concrete open caisson 3 with a cavity in the middle and arranged on the base groove 2, wherein the rock mass 20 reserved on the inner wall of the base groove 2 can be arranged at different heights inside and outside by combining the stress characteristics of the embedded open caisson foundation, the stressed area around the steel shell concrete open caisson 3 is large, rock stratum with higher bearing capacity is embedded, the stress in the middle area is relatively small, the rock in the middle is not required to be excavated or partially excavated, so that bare rock bearing capacities with different lithologies can be fully exerted, simultaneously, the underwater blasting excavation amount and the concrete filling amount in the open caisson are reduced by about 1.5 square respectively, a large amount of resources can be saved, in the embodiment, the seabed rock face 1 comprises a first area 11, a second area 12 and a third area 13 which are distributed from top to bottom, the first area 11, the second area 12 and the third area 13 are blasted in sequence, the stressed area 2 is formed, the bottom of the three area 13 is blasted, and the bottom of the three area is blasted can be further improved when the three areas are blasted, and the bottom area 13 is blasted, and the bottom is formed, and the bottom is further blasted 1 is capable of the bottom.
Referring to fig. 3, the energy-resolving blasting structure comprises coarse sand 74, a high-density ball 73, a detonator 72 and a detonating tube 71 which are arranged in a blast hole 70 of a third region 13 from bottom to top, wherein the blast hole 70 is dug at a proper position of the third region 13, the detonator 72 and the high-density ball 73 are blocked between the wall of the blast hole 70 and the coarse sand 74, and when the third region 13 is blasted, the high-density ball 73 and the coarse sand 74 can bear part of blasting force, so that damage to rock mass at the bottom of the third region 13 during blasting can be reduced, and the bearing capacity of the bottom of the seabed rock face 1 is further improved.
Specifically, referring to fig. 4, the steel-shell concrete open caisson 3 in the invention comprises a steel open caisson, concrete in the open caisson and a reinforced concrete bearing platform, wherein the steel open caisson comprises a steel ring cylinder 31 and a cross partition wall 32, the steel ring cylinder 31 is arranged in a foundation trench 2, the cross partition wall 32 is arranged in the steel ring cylinder 31 and can strengthen the internal connection of the steel ring cylinder 31, a cavity capable of containing a rock mass 20 is reserved between the steel ring cylinder 31 and the cross partition wall 32, when the open caisson is placed, the lower part of the cross partition wall 32 is abutted against the rock mass 20, a plurality of wellholes 30 are further arranged on the steel ring cylinder 31, after the open caisson is placed in place, the concrete in the open caisson is poured in the wellholes 30 of the steel ring cylinder 31 and gaps between the steel ring cylinder 31 and the cross partition wall 32, and the reinforced concrete bearing platform is poured on the top of the steel ring cylinder 31, so that the whole steel-shell concrete open caisson 3 can be placed in the foundation trench 2 more firmly.
In addition, the steel ring cylinder 31 and the cross partition wall 32 are manufactured and processed in a factory in a blocking way, the block sections of the steel open caisson are assembled in a dock, the assembly principle is that the block sections of the partition wall are firstly arranged in the middle and then are arranged around, then the block sections of the wall of the well are arranged behind the block sections, the jig frame is firstly installed and supported, then the cross partition wall 32 is hoisted, the longitudinal and transverse direction and the height direction are positioned and adjusted, the block sections are used as positioning reference sections, and then other block sections are hoisted around, so that the weight of the steel open caisson in hauling can be reduced, the construction is facilitated for operators, then concrete is poured after hauling positioning, and the connection between the steel open caisson and the foundation pit 2 can be reinforced.
Referring to fig. 5 and 6, a main anchor cable assembly 4 is provided on a steel-shelled concrete open caisson 3, the main anchor cable assembly 4 includes a main concrete anchor 41, a main anchor cable 42, a guide wheel 43 and a driving device, the main concrete anchor 41 is fixed on the seabed, the guide wheel 43 is provided on the steel-shelled concrete open caisson 3, one side of the main anchor cable 42 is fixed on the main concrete anchor 41, and then the main concrete anchor 41 on the other side is bypassed by the plurality of guide wheels 43, the driving device may be provided as a hoist or jack, the driving device is provided on the steel-shelled concrete open caisson 3, and an output end of the driving device is connected with the guide wheel 43, thereby the inclination of the steel-shelled concrete open caisson 3 can be adjusted by changing the stress of the main anchor cable 42, and further rapid and accurate implantation of the steel-shelled concrete open caisson 3 can be further realized.
Referring to fig. 5 and 6, a side anchor cable assembly 5 is provided on a steel-shell concrete open caisson 3, the side anchor cable assembly 5 includes a sub-concrete anchor 51, a side anchor cable 52, and a hydraulic continuous jack, the sub-concrete anchor 51 is fixed on the seabed, the hydraulic continuous jack is fixed at the upper end of the steel-shell concrete open caisson 3, one end of the side anchor cable 52 is fixed at the output end of the hydraulic continuous jack, the other end of the side anchor cable 52 is fixed on the sub-concrete anchor 51, and when the steel-shell concrete open caisson 3 is positioned, the plane position of the open caisson can be adjusted by changing the stress of the side anchor cable 52 through the expansion and contraction amount of the output end of the hydraulic continuous jack.
During positioning, 4 1500t concrete anchors are respectively arranged at the upper and lower sides, 2 1500t concrete anchors are respectively arranged at the two sides, the concrete anchors are integrally poured, a cable collecting system is arranged on a steel truss platform at the top of the steel shell concrete open caisson 3 and is arranged in an upper layer and a lower layer, wherein a main anchor is arranged at the bottom layer, side anchors are arranged at the top layer, and a synchronous hydraulic system is used for stretching a main cable and a side cable to realize open caisson posture adjustment.
Referring to fig. 7 and 8, a leveling component 6 is arranged on the steel shell concrete open caisson 3, the leveling component 6 comprises a leveling support column 61, a limit hoop 62, a counter-force seat 63 and a jack, the limit hoop 62 is fixed on the steel shell concrete open caisson 3, the leveling support column 61 passes through the limit hoop 62 and then is abutted to the bottom wall of the foundation trench 2, the counter-force seat 63 is arranged on the leveling support column 61, the jack is arranged on the counter-force seat 63, the output end of the jack is abutted to the upper end face of the steel shell concrete open caisson 3, the steel shell concrete open caisson 3 is dropped by the jack on the counter-force seat 63, the inclination angle change of the steel shell concrete open caisson 3 is realized, and then the falling leveling of the steel shell concrete open caisson 3 is realized.
The invention provides a construction method for embedded setting of a sunk well foundation, which comprises the following steps:
s1, underwater blasting excavation and substrate base cleaning: when the seabed rock face 1 is blasted, a groove pulling groove with a free face is firstly dug on the seabed rock face 11, a lateral free face is provided for the subsequent groove main body blasting, then underwater drilling blasting is carried out on a step groove main body (area one 11) taking the groove pulling groove as the free face, then deep sea underwater disposable groove excavation control blasting with two free faces (area two 12) is carried out by adopting a hole bottom continuous blasting structure by taking the groove pulling groove as the free face, after the reef blasting and slag removal work of the area one 11 and the area two 12 are completed, area three 13 blasting is carried out by adopting a fusion blasting structure, wherein the hole bottom continuous blasting structure comprises a detonator 72 and a detonating tube 71, a blasthole 70 is dug at a proper position, the detonator 72 is connected with the detonating tube 71, one end of the detonating tube 71 extends out of the blasthole 70, the detonator 72 is blocked in the blasthole 70 by a blocking object 7, and when the area two 12 is blasted, the whole blasting of the area two 12 can be realized.
When the construction is carried out, the outer diameter of the bottom of the foundation pit 2 is 4m larger than the outer diameter of the steel shell concrete open caisson 3, the inner diameter is 6m smaller than the inner diameter of the inner ring of the steel shell concrete open caisson 3, the outer side of the foundation is 2m away from the edge of the open caisson, the inner side of the foundation pit is 3m away from the edge of the open caisson, when the foundation pit 2 is blasted, the large plum blossom grab bucket and the small plum blossom grab bucket are matched with each other to carry out slag removal, when the bottom is removed, the grab bucket is required to be overlapped by 2.0 m before and after each time, and the left and right grab bucket is overlapped by more than 1.0 m, and when the slag removal amount is less than 1/5 bucket amount, the foundation pit can be rotationally dug to the next digging point; the edge of the substrate is cleaned by a small plum blossom grab bucket slag cleaning ship, so that a slag cleaning blind area is reduced; after the slag removal is finished, adopting a high-power sand suction boat, arranging suction points according to a plum blossom shape of 1X 1m, sucking the mixture of broken stone and water into a slag suction pipe, and discharging the mixture from a pipe orifice at the top; after cleaning, carrying out rock surface flatness detection on the blasting area by adopting multi-beam water depth measurement and side-scan sonar, and processing the positions which cannot meet the requirements until the design requirements are met.
S2, manufacturing a steel open caisson: manufacturing steel block pieces of the steel shell concrete open caisson 3 in a factory in a blocking manner, pouring 2m high concrete in the cutting edge feet after the bottom section steel shell concrete open caisson 3 pieces are spliced, roughening the top surface and removing slag, and continuously splicing the steel open caisson to form floating sections;
s3, floating, positioning and sinking of the steel open caisson: after the seabed is blasted and slag removed, the steel open caisson is carried out under sea and floating to a pier position, water is irrigated and sunk, a main anchor cable pulling assembly 4 and an edge anchor cable pulling assembly 5 are adopted for positioning, the open caisson positioning is carried out in two stages of initial positioning and accurate positioning, the initial positioning is carried out after the steel open caisson is carried out in floating and in place, the cable pulling connection is completed, the accurate positioning is carried out when the steel open caisson is submerged to a position 4-6 m away from an actual seabed, a construction method of accurate positioning and quick implantation is adopted when the steel open caisson is implanted, after the steel open caisson is accurately positioned, the favorable time period of small water flow speed, stable flow state and small wind speed is selected, quick water injection is realized in a well wall and a compartment, and in the process of sinking the open caisson positioning, the stress condition of each anchor cable is detected at any time, whether the open caisson is uniform and proper or not is correspondingly adjusted;
s4, leveling the steel open caisson: the steel open caisson realizes falling leveling through the leveling component 6;
s5, performing underwater concrete construction on the steel open caisson, the well wall and the partition wall: after the steel open caisson is positioned, casting concrete in the open caisson in the gaps between the well holes 30 of the steel ring cylinder 31 and the cross partition walls 32, and casting reinforced concrete bearing platforms on the tops of the steel ring cylinder 31, wherein the peripheral small well holes 30 are firstly constructed, and then the middle large well holes 30 are constructed; after the strength of the bottom sealing concrete reaches 80%, carrying out construction on the compartment and the underwater concrete in the well hole 30 according to the compartment and the symmetrical sequence, wherein the concrete joint surfaces between the layers are roughened and slag removed;
s6, construction of a bearing platform: binding bearing platform steel bars, pouring bearing platform concrete in a layered manner, connecting a high single-arm cofferdam at the top of a steel shell concrete open caisson 3 for preventing waves from entering an operation area during construction, pouring the bearing platform in a layered manner, constructing according to a large-volume concrete construction method, and taking measures to reduce hydration heat and strengthen maintenance to prevent cracks from occurring in the concrete.
In addition, the annular outer ring of the steel shell concrete open caisson 3 is arranged on the breeze quartz An Danyan, the annular inner ring of the steel shell concrete open caisson 3 is arranged on the weak breeze An Danyan, the annular outer ring with larger stress is arranged on the breeze quartz and the inner ring with smaller stress is arranged on the weak breeze quartz and can fully exert bare rock bearing capacities of different lithologies.
And before the concrete is poured underwater, a piece of stone is thrown in a certain height range of the foundation pit outside the steel shell concrete open caisson 3, so that scouring is reduced, leakage during pouring of the underwater concrete in the well hole 30 can be prevented, the bearing capacity of the seabed rock surface 1 can be improved, the piece of stone can be slightly smaller than the replacement and filling amount, the engineering cost is reduced, and the operation is easier, so that the mechanical construction is facilitated.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides an embedded setting open caisson foundation, its characterized in that, including the foundation trench that opens on the seabed rock face, leave and locate the rock mass of foundation trench inner wall and inlay the steel-shelled concrete open caisson of cavity in the centre in the foundation trench, steel-shelled concrete open caisson includes steel open caisson, open caisson internal concrete and reinforced concrete cushion cap, still offered a plurality of borehole on the steel open caisson, just the cavity is left and is located in the steel open caisson is inside to be used for holding the rock mass, concrete placement in the open caisson is in the borehole on the steel open caisson, reinforced concrete cushion cap pour in steel ring top, the seabed rock face is including from top to bottom distribution's region one, region two and region three, region one, region two, region three are exploded in proper order, form the foundation trench, just adopt the energy accumulation blasting structure that disappears that is used for alleviating the damage of bottom seabed rock face when region three blasting.
2. The embedded open caisson foundation according to claim 1, wherein the energy-gathering blasting structure comprises coarse sand, a high-density ball, a detonator and a detonating tube, wherein the coarse sand, the high-density ball, the detonator and the detonating tube are arranged in a blast hole of the third area from bottom to top, the detonator is connected with the detonating tube, one end of the detonating tube extends out of the blast hole, and the detonator is blocked in the blast hole through a blocking object.
3. The embedded open caisson foundation according to claim 1, wherein a main anchor cable assembly is arranged on the steel shell concrete open caisson, the main anchor cable assembly comprises a main concrete anchor, a main anchor cable, a guide wheel and a driving device, the main concrete anchor is fixed on a seabed, the guide wheel is arranged on the steel shell concrete open caisson, one side of the main anchor cable is fixed on the main concrete anchor, the main anchor cable bypasses a plurality of guide wheels and then is fixed with the main concrete anchor on the other side, the driving device is arranged on the steel shell concrete open caisson and used for adjusting the inclination of the steel shell concrete open caisson, and the output end of the driving device is connected with the guide wheel.
4. The embedded open caisson foundation according to claim 1, wherein a side anchor cable assembly is further arranged on the steel shell concrete open caisson, the side anchor cable assembly comprises a secondary concrete anchor, a side anchor cable and a hydraulic continuous jack, the secondary concrete anchor is fixed on the seabed, the hydraulic continuous jack is fixed on the steel shell concrete open caisson, one end of the side anchor cable is fixed at the output end of the hydraulic continuous jack, and the other end of the side anchor cable is fixed on the secondary concrete anchor.
5. The embedded open caisson foundation according to claim 1, wherein a leveling component is further arranged in the steel shell concrete open caisson, the leveling component comprises a leveling support column, a limiting hoop, a counter-force seat and a jack, the limiting hoop is fixed on the steel shell concrete open caisson, the leveling support column passes through the limiting hoop and then abuts against the bottom wall of the foundation trench, the counter-force seat is arranged on the leveling support column, the jack is arranged on the counter-force seat, and the output end of the jack abuts against the upper end face of the steel shell concrete open caisson.
6. The construction method for embedded setting of a sunk well foundation according to claims 1-5, comprising the steps of:
s1, underwater blasting excavation and substrate base cleaning: firstly, carrying out underwater trench drilling blasting of a free surface in a first area, then carrying out underwater one-step trench blasting of two free surfaces in a second area by adopting a hole bottom continuous blasting structure, after the reef blasting and slag removal work of the first area and the second area are completed, carrying out blasting by adopting a fusion energy removing blasting structure in a third area, then carrying out slag removal again, finally carrying out rock surface flatness detection on the blasted area, and treating the parts which cannot meet the requirements until the design requirements are met;
s2, manufacturing a steel open caisson: manufacturing steel block parts of the steel shell concrete open caisson in a factory in a blocking manner, pouring 2m high concrete in the cutting edge feet after the bottom section steel shell concrete open caisson foundation block parts are spliced, roughening the top surface and removing slag, and continuously splicing the steel shell concrete open caisson to form floating sections;
s3, floating, positioning and sinking of the steel open caisson: after the slag is removed by the explosion of the seabed, the steel open caisson is carried to the pier position in a floating way, the steel open caisson is irrigated to sink and land, and the main anchor cable component and the side anchor cable component are adopted for positioning;
s4, leveling the steel open caisson: the steel open caisson realizes falling leveling through the leveling component;
s5, performing underwater concrete construction on the steel open caisson, the well wall and the partition wall: after the steel open caisson is positioned, pouring concrete in the open caisson in the steel open caisson, and pouring a reinforced concrete bearing platform at the top of the steel open caisson;
s6, construction of a bearing platform: binding bearing platform reinforcing steel bars and pouring bearing platform concrete in layers.
7. The construction method for embedded open caisson foundation according to claim 6, wherein the annular outer ring of the steel shell concrete open caisson is arranged on breeze-resistant quartz An Danyan, and the annular inner ring of the steel shell concrete open caisson is arranged on Weak-resistant quartz An Danyan.
8. The method for constructing an open caisson foundation according to claim 6, wherein before underwater concrete construction, a rock is cast into a certain height range of the foundation pit outside the steel-shelled concrete open caisson.
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| CN202310280489.1A CN116356870A (en) | 2023-03-21 | 2023-03-21 | Embedded open caisson foundation and construction method thereof |
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| CN202310280489.1A CN116356870A (en) | 2023-03-21 | 2023-03-21 | Embedded open caisson foundation and construction method thereof |
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| CN104631481A (en) * | 2014-12-26 | 2015-05-20 | 中铁大桥局集团有限公司 | Mooring positioning device for open caisson and construction method of mooring positioning device |
| CN105569064A (en) * | 2015-12-10 | 2016-05-11 | 中铁大桥局集团有限公司 | Arrangement type sunk well foundation construction method applicable to deepwater bare rock |
| CN110685293A (en) * | 2018-07-06 | 2020-01-14 | 中铁第四勘察设计院集团有限公司 | Annular open caisson structure |
| CN211113714U (en) * | 2019-08-02 | 2020-07-28 | 中铁第四勘察设计院集团有限公司 | Thin-wall full-surrounding embedded foundation suitable for rock foundation |
| CN115790302A (en) * | 2022-11-25 | 2023-03-14 | 中铁四局集团第二工程有限公司 | Underwater blasting construction method for embedded open caisson deep water foundation |
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2023
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104631481A (en) * | 2014-12-26 | 2015-05-20 | 中铁大桥局集团有限公司 | Mooring positioning device for open caisson and construction method of mooring positioning device |
| CN105569064A (en) * | 2015-12-10 | 2016-05-11 | 中铁大桥局集团有限公司 | Arrangement type sunk well foundation construction method applicable to deepwater bare rock |
| CN110685293A (en) * | 2018-07-06 | 2020-01-14 | 中铁第四勘察设计院集团有限公司 | Annular open caisson structure |
| CN211113714U (en) * | 2019-08-02 | 2020-07-28 | 中铁第四勘察设计院集团有限公司 | Thin-wall full-surrounding embedded foundation suitable for rock foundation |
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