CN102877482A - Gravity type foundation structure and construction method thereof - Google Patents
Gravity type foundation structure and construction method thereof Download PDFInfo
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- CN102877482A CN102877482A CN2012103346337A CN201210334633A CN102877482A CN 102877482 A CN102877482 A CN 102877482A CN 2012103346337 A CN2012103346337 A CN 2012103346337A CN 201210334633 A CN201210334633 A CN 201210334633A CN 102877482 A CN102877482 A CN 102877482A
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Abstract
The invention discloses a gravity type foundation structure and a construction method thereof. A concrete cylinder-type pressure loading cabin is arranged on a concrete top cover; a cylinder structure formed by a concrete cylinder wall and a steel cylinder wall is arranged on the lower side of the concrete top cover; first pipelines are uniformly arranged in the concrete cylinder wall along the radial direction; and a steel subdivision plate is arranged in the internal space of the steel cylinder wall. The construction method comprises the following steps of: prefabricating the gravity type foundation structure on the land; transporting the whole foundation to a construction site in a floating mode, and performing self-weight sinking construction and negative pressure sinking construction; after the negative pressure sinking construction is stopped, performing groundbreaking sinking construction through the first pipelines; performing grouting operation through the first pipelines and second pipelines on sub-cabins; and filling heavy objects in the concrete cylinder-type pressure loading cabin, performing ballasting operation, and simultaneously performing riprap ballasting operation above the concrete top cover and at the periphery of the concrete cylinder-type pressure loading cabin. By the structure and the method, transportation and construction difficulties can be reduced, transportation and installation speeds can be increased, and the applicability to a soil body can be enhanced, so that a construction period is shortened, and engineering cost is substantially reduced.
Description
Technical field
The present invention relates to a kind of foundation structure, specifically, relate to foundation structure and job practices thereof in a kind of harbour, ocean, water conservancy and the bridge engineering.
Background technology
At present at the harbour, ocean, water conservancy and bridge engineering, common base form mainly comprises pile foundation, stent-type basis, gravity type foundation and bucket foundation.Gravity type foundation is the weight opposing external force of leaning on structure itself and upper filler or ballast, the structure of keeping building Against Sliding Stability and stability against over turning, because its structural meterials is generally take concrete and sandstone material as main, material cost is lower, and be generally the shallow foundation form, construction cost is also lower, is therefore approved and extensive use by engineering circles gradually.
But gravity type foundation is because weight is larger, and the difficulty of transportation and construction is also relatively large.Also need to carry out the ground processing when shallow-layer soil property is weak soil if run in addition, not only can greatly increase construction cost, and limit the scope of application of gravity type foundation.
Summary of the invention
What the present invention will solve is existing gravity type foundation transportation and the larger technical problem of difficulty of construction, a kind of novel gravity type foundation structure and job practices thereof are provided, can also install by first self-floating towing, after being installed, end passes through again the ballast tank ballast, can the decrease construction cost, significantly improve installation rate.
In order to solve the problems of the technologies described above, the present invention is achieved by following technical scheme:
A kind of gravity type foundation structure comprises circular concrete top cover, is provided with structural beam on the described concrete top cover, and described structural beam bottom surface flushes with described concrete top cover bottom surface;
The concrete cylindrical that is provided with hollow above the described concrete top cover carries ballasting, described concrete cylindrical carries ballasting bottom surface diameter less than or equal to described concrete top cover diameter, described concrete cylindrical carries ballasting end face diameter less than or equal to the bottom surface diameter, and described concrete cylindrical carries and radially is evenly equipped with prestressed reinforcement in the ballasting wall;
Be provided with cylindrical structure below the described concrete top cover, described cylindrical structure is constituted by the concrete tube wall on top and the steel barrel of bottom, described steel barrel is inserted in described concrete tube wall and connects, described concrete tube wall has with respect to the reinforcement radial equipartition of described steel barrel can transferring high voltage gas or the first pipeline of water under high pressure, and described the first pipeline top stretches out in described concrete top cover, the bottom stretches out in described concrete tube wall;
Described cylindrical structure inside is provided with steel subdivision plate, described steel barrel top and described steel subdivision plate top are all inserted described concrete top cover and are fixedly connected with it, described steel barrel, described steel subdivision plate and described concrete top cover consist of the sealing subdivision of a plurality of bottom openings, but each described subdivision top is provided with the second pipeline of switch.
Described structural beam comprises the outer-ring beam that is arranged at described concrete lid periphery, carries inner ring beam that ballasting is connected and radial equipartition in the straight beam of described concrete top cover with described concrete cylindrical, and described straight beam extends to periphery by described concrete top cover center.
Described subdivision forms cellular, comprises a regular hexagon subdivision at center and evenly be arranged at its six identical limit subdivisions on every side that all described steel subdivision plate equal in length are 0.25 times of described cylindrical structure diameter.
The diameter of described concrete top cover is 10 ~ 50m, and thickness is 0.2 ~ 0.6m; The breadth of section of described structural beam central sill is 0.5 ~ 1.5m, highly is 0.8 ~ 1.8m.
The height of described concrete tube wall is 0.1 ~ 2m, and thickness is 50 ~ 1000mm.
The height of described steel barrel is 1 ~ 5m, and thickness is 10 ~ 100mm; The degree of depth that described steel barrel is inserted in described concrete tube wall is 0.1 ~ 1m.
The diameter of described the first pipeline is 5 ~ 200mm; The number of described the first pipeline is 10 ~ 100.
The thickness of described steel subdivision plate is 10 ~ 30mm; The degree of depth that described steel subdivision plate inserts described structural beam and described concrete top cover is 0.1 ~ 1m.
The wall that described concrete cylindrical carries ballasting is the curved surface of curved indent, and the curvature of this curved surface is 1/60 ~ 1/10.
A kind of job practices of gravity type foundation structure comprises the steps:
A. land first with described concrete tube wall and the described cylindrical structure of described steel barrel assembling formation, assemble again described steel subdivision plate;
B. utilize the thin-walled profiled sheet as the bottom surface template of described concrete top cover, described thin-walled profiled sheet and described cylindrical structure and described steel subdivision plate connect and compose the hermetically-sealed construction of bottom opening, and described hermetically-sealed construction inside is the sealing subdivision of a plurality of bottom openings;
C. described hermetically-sealed construction integral body is hung in the water on limit, land, check respectively the tightness of each subdivision;
D. after the tightness of each subdivision meets the requirements, the described hermetically-sealed construction that hangs in the water is fastened cable rope;
E. assembling reinforcement and fluid concrete on described thin-walled profiled sheet carry out the construction that described concrete top cover and described concrete cylindrical carry ballasting;
F. after described concrete top cover and described concrete cylindrical Construction of Transition Section were finished and reached design strength and require, the base integral transportation by driving was to the job site; By described the second pipeline each subdivision internal gas pressure is regulated in each subdivision gas injection or venting in the transportation by driving process, with control towage stability;
G. the sinking of carrying out conducting oneself with dignity is that master, negative pressure sinking are auxiliary sinking construction;
When h. sinking to described concrete tube wall position, transmit high pressure gas or water under high pressure downwards by described the first pipeline, sinking construction breaks ground; When occur in the sinking process, each subdivision is applied different atmospheric pressures or water pressure is carried out leveling by described the second pipeline;
I. break ground sink down into design height after, carry out grouting operation by the first pipeline on the described concrete tube wall and the second pipeline on the described subdivision, slip casting is concrete grout or high-strength cement mortar;
J. carry at described concrete cylindrical and fill weight etc. in the ballasting and carry out the ballast operation, described weight is water, sandstone or mortar; Simultaneously above described concrete top cover, described concrete cylindrical carries out the operation of jackstone ballast around carrying ballasting.
The invention has the beneficial effects as follows:
The present invention proposes a kind of novel gravity type foundation structure, comprises the cylindrical structure that concrete tube wall and steel barrel combine, and is provided with steel subdivision plate in the cylinder, and the concrete top cover is provided with concrete cylindrical and carries ballasting;
Since the gravity type foundation structure is prefabricated finish after, weight is relatively light, therefore can first self-floating towing to the job location; Because steel barrel and the steel subdivision plate of bottom are very thin, lower assisting of deadweight sinking method and negative pressure sinking method, the gravity type foundation structure can just be stepped into mud; Owing to radially be provided with in uniform way the first pipeline in the concrete wall, break ground by high pressure gas/water after just stepping into mud, be easy to overcome the soil body resistance incision soil body and reach the design submergence depth, can increase substantially the subsidence velocity of bucket foundation and sink to bit rate; After end was installed, slip casting and ballast can further increase the stability of foundation structure side and bottom surface and soil body contact portion.
Comprehensive said structure and construction characteristic, the present invention can significantly reduce the difficulty of transportation and construction, the speed that improves transportation and install, so that foundation structure system is to the applicable ability enhancing of the soil body, do not need the advanced processing ground, thereby construction period is shortened, engineering cost is decrease also.
Description of drawings
Fig. 1 is the schematic side view of gravity type foundation structure provided by the present invention;
Fig. 2 is the schematic top plan view of gravity type foundation structure provided by the present invention;
Fig. 3 is the floor map of concrete top cover provided by the present invention;
Fig. 4 is the floor map of provided by the present invention minute cabin structure.
Among the figure: 1, the concrete top cover; 2, concrete cylindrical carries ballasting; 21, prestressed reinforcement; 3, cylindrical structure; 31, concrete tube wall; 32, the steel barrel; 4, steel subdivision plate; 5, structural beam; 51, outer-ring beam; 52, inner ring beam; 53, straight beam; 6, the first pipelines; 7, the second pipelines.
The specific embodiment
For further understanding content of the present invention, characteristics and effect, hereby exemplify following examples, and cooperate accompanying drawing to be described in detail as follows:
As depicted in figs. 1 and 2, present embodiment has disclosed a kind of gravity type foundation structure, comprises that mainly concrete top cover 1, concrete cylindrical carry cylindrical structure 3 and steel subdivision plate 4 that ballasting 2, concrete tube wall 31 and steel barrel 32 form.
Concrete top cover 1 is that diameter is 40m, and thickness is the round sheet structure of 0.4m.Concrete top cover 1 common diameter range of choice is 10 ~ 50m, and the thickness range of choice is 0.2 ~ 0.6m.
Concrete top cover 1 upper surface is distributed with the structural beam 5 that can guarantee concrete top cover 1 rigidity, and the bottom surface of structural beam 5 flushes with the bottom surface of concrete top cover 1.In conjunction with shown in Figure 3, structural beam 5 is made of outer-ring beam 51, inner ring beam 52 and 16 straight beams 53, outer-ring beam 51 is arranged on concrete top cover 1 peripheral position, inner ring beam 52 is arranged on concrete cylindrical and carries ballasting 2 bottoms and coupled, 16 straight beam 53 radial equipartitions extend to periphery in concrete top cover 1 surface by the center.The breadth of section of structural beam 5 China and foreign countries' ring beams 51, inner ring beam 52 and straight beam 53 is 1.2m, highly is 1.6m.The common breadth of section range of choice of each beam is 0.5 ~ 1.5m in the structural beam, and the height range of choice is 0.8 ~ 1.8m.
Concrete cylindrical carries ballasting 2 and is arranged at concrete top cover 1 top, and the bottom surface diameter is 30m, is not more than concrete top cover 1 diameter.Concrete cylindrical changeover portion 2 is prestressed reinforced concrete construction, radially is evenly equipped with 50 prestressed reinforcements 21 in the wall.In order to reach preferably supporting role, concrete cylindrical changeover portion 2 end face diameters are less than or equal to the bottom surface diameter, and wall is the curved surface of curved indent, and the curvature of curved surface is 1/40, and the common range of choice of wall curvature is 1/60 ~ 1/10.
The height of steel barrel 32 is 3m, and thickness is 30mm; In general, steel barrel 32 common height ranges of choice are 1 ~ 5m, and the thickness range of choice is 10 ~ 100mm.
The height of concrete tube wall 31 is 1m, height be 600mm; In general, concrete tube wall 31 common height ranges of choice are 0.1 ~ 5m, and the sidewall thickness range of choice is 50 ~ 1000mm.Obviously, the thickness of concrete tube wall 31 is greater than the thickness of steel barrel 32, in the reinforcement of concrete tube wall 31 with respect to steel barrel 32, it is that the first pipeline 6, the first pipelines 6 tops of 20mm slightly stretch out in concrete top cover 1, bottom and slightly stretch out in concrete tube wall 31 that radial equipartition has 48 diameters.The first pipeline 6 is used for transferring high voltage gas or water under high pressure, and its common number range of choice is 10 ~ 100, and the diameter range of choice is 5 ~ 200mm.
In conjunction with shown in Figure 4, cylindrical structure 3 inside are provided with steel subdivision plate 4.The height of steel subdivision plate 4 is 4m, is not more than the height of cylindrical structure 3; The thickness of steel subdivision plate 4 is 15mm, and its range of choice is in 10 ~ 30mm usually.Steel subdivision plate 4 connects as one with concrete top cover 1 by upwards stretching in concrete top cover 1 and the straight beam 53, and stretching into the degree of depth is 0.5m.The degree of depth of steel subdivision plate 4 top insert structure girder systems 5 is chosen in 0.1 ~ 1m usually.
Thus, cylindrical structure 3, steel subdivision plate 4 and concrete top cover 1 consist of the sealing subdivision of a plurality of bottom openings, and the second pipeline 7 that is provided with switch is reserved respectively at each subdivision top.Seven subdivisions in minute cabin structure seal intact except bottom opening each other, guarantee not go here and there each other the cabin.Preferably, subdivision forms cellular minute cabin structure, comprises a regular hexagon subdivision at center and evenly is arranged at its six identical limit subdivisions on every side.The length of side of regular hexagon subdivision and limit subdivision is impartial, is 0.25 times of cylindrical structure 3 diameters.
Present embodiment has also disclosed the job practices of above-mentioned gravity type foundation structure simultaneously, specifically comprises the steps:
Quayside consists of cylindrical structure 3 with concrete tube wall 31 and 32 assemblings of steel barrel first by land, assembles steel subdivision plate 4 again.
The bottom surface template of utilizing the thin-walled profiled sheet to serve as concrete top cover 1, thin-walled profiled sheet and cylindrical structure 3 and steel subdivision plate 4 connect and compose the hermetically-sealed construction of bottom opening simultaneously, and hermetically-sealed construction inside is the sealing subdivision of a plurality of bottom openings.
The hermetically-sealed construction integral body that above-mentioned thin-walled profiled sheet, cylindrical structure 3 and steel subdivision plate 4 are formed hangs in the quayside water, checks respectively the tightness of each subdivision, and integral body is recalled to land harbour inspection and studied for a second time courses one has flunked weld seam if entry is leaked gas then.
After the tightness of each subdivision meets the requirements, the sealing steel work that hangs in the water is fastened cable rope.
Assembling reinforcement and fluid concrete on the bottom surface template that the thin-walled profiled sheet is made carry out the construction that concrete top cover 1 and concrete cylindrical carry ballasting 2.
Concrete top cover 1 and concrete cylindrical carry ballasting 2 constructions to be finished, and after reaching the design strength requirement, the base integral transportation by driving is arrived the job site.The second pipeline 7 pairs of each subdivision gas injection or the venting that can reserve by the subdivision top in the transportation by driving process, regulating each subdivision internal gas pressure, thus control towage stability.
After the base integral transportation by driving was in place, the sinking construction of conducting oneself with dignity when the deadweight sinking construction is not in place, can be assisted and carry out the negative pressure sinking construction.
Will be slack when negative pressure sinks to concrete tube wall 31 position, transmit high pressure gas or water under high pressure downwards by the first pipeline 6, sinking construction breaks ground.If the gravity type foundation structure occurs tilting in the sinking process, can apply different cabin inner air pressure or water pressure by 7 pairs of each subdivisions of the second pipeline, carry out leveling work.
Break ground sink down into design height after, carry out grouting operation by the second pipeline 7 on the first pipeline 6 on the concrete tube wall 31 and the subdivision, reach the underpinning structural base, and the purpose that increases the stability of side of the base plate and bottom surface and soil body contact portion; Wherein concrete grout or high-strength cement mortar are selected in slip casting.
Carry in the ballasting 2 at concrete cylindrical and to fill weight, carry out the ballast operation such as water, sandstone or mortar etc.Simultaneously above concrete top cover 1, concrete cylindrical carry ballasting 2 around carry out the operation of jackstone ballast.
Although the above is described the preferred embodiments of the present invention by reference to the accompanying drawings; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, can also make the concrete conversion of a lot of forms, these all belong within protection scope of the present invention.
Claims (10)
1. a gravity type foundation structure is characterized in that, comprises circular concrete top cover, is provided with structural beam on the described concrete top cover, and described structural beam bottom surface flushes with described concrete top cover bottom surface;
The concrete cylindrical that is provided with hollow above the described concrete top cover carries ballasting, described concrete cylindrical carries ballasting bottom surface diameter less than or equal to described concrete top cover diameter, described concrete cylindrical carries ballasting end face diameter less than or equal to the bottom surface diameter, and described concrete cylindrical carries and radially is evenly equipped with prestressed reinforcement in the ballasting wall;
Be provided with cylindrical structure below the described concrete top cover, described cylindrical structure is constituted by the concrete tube wall on top and the steel barrel of bottom, described steel barrel is inserted in described concrete tube wall and connects, described concrete tube wall has with respect to the reinforcement radial equipartition of described steel barrel can transferring high voltage gas or the first pipeline of water under high pressure, and described the first pipeline top stretches out in described concrete top cover, the bottom stretches out in described concrete tube wall;
Described cylindrical structure inside is provided with steel subdivision plate, described steel barrel top and described steel subdivision plate top are all inserted described concrete top cover and are fixedly connected with it, described steel barrel, described steel subdivision plate and described concrete top cover consist of the sealing subdivision of a plurality of bottom openings, but each described subdivision top is provided with the second pipeline of switch.
2. a kind of gravity type foundation structure according to claim 1, it is characterized in that, described structural beam comprises the outer-ring beam that is arranged at described concrete lid periphery, carries inner ring beam that ballasting is connected and radial equipartition in the straight beam of described concrete top cover with described concrete cylindrical, and described straight beam extends to periphery by described concrete top cover center.
3. a kind of gravity type foundation structure according to claim 1, it is characterized in that, described subdivision forms cellular, the regular hexagon subdivision that comprises the center with evenly be arranged at it around six identical limit subdivisions, all described steel subdivision plate equal in length are 0.25 times of described cylindrical structure diameter.
4. a kind of gravity type foundation structure according to claim 1 is characterized in that, the diameter of described concrete top cover is 10 ~ 50m, and thickness is 0.2 ~ 0.6m; The breadth of section of described structural beam central sill is 0.5 ~ 1.5m, highly is 0.8 ~ 1.8m.
5. a kind of gravity type foundation structure according to claim 1 is characterized in that, the height of described concrete tube wall is 0.1 ~ 2m, and thickness is 50 ~ 1000mm.
6. a kind of gravity type foundation structure according to claim 1 is characterized in that, the height of described steel barrel is 1 ~ 5m, and thickness is 10 ~ 100mm; The degree of depth that described steel barrel is inserted in described concrete tube wall is 0.1 ~ 1m.
7. a kind of gravity type foundation structure according to claim 1 is characterized in that, the diameter of described the first pipeline is 5 ~ 200mm; The number of described the first pipeline is 10 ~ 100.
8. a kind of gravity type foundation structure according to claim 1 is characterized in that, the thickness of described steel subdivision plate is 10 ~ 30mm; The degree of depth that described steel subdivision plate inserts described structural beam and described concrete top cover is 0.1 ~ 1m.
9. a kind of gravity type foundation structure according to claim 1 is characterized in that, the wall that described concrete cylindrical carries ballasting is the curved surface of curved indent, and the curvature of this curved surface is 1/60 ~ 1/10.
10. the job practices of gravity type foundation structure as claimed in claim 1 is characterized in that, comprises the steps:
A. land first with described concrete tube wall and the described cylindrical structure of described steel barrel assembling formation, assemble again described steel subdivision plate;
B. utilize the thin-walled profiled sheet as the bottom surface template of described concrete top cover, described thin-walled profiled sheet and described cylindrical structure and described steel subdivision plate connect and compose the hermetically-sealed construction of bottom opening, and described hermetically-sealed construction inside is the sealing subdivision of a plurality of bottom openings;
C. described hermetically-sealed construction integral body is hung in the water on limit, land, check respectively the tightness of each subdivision;
D. after the tightness of each subdivision meets the requirements, the described hermetically-sealed construction that hangs in the water is fastened cable rope;
E. assembling reinforcement and fluid concrete on described thin-walled profiled sheet carry out the construction that described concrete top cover and described concrete cylindrical carry ballasting;
F. after described concrete top cover and described concrete cylindrical Construction of Transition Section were finished and reached design strength and require, the base integral transportation by driving was to the job site; By described the second pipeline each subdivision internal gas pressure is regulated in each subdivision gas injection or venting in the transportation by driving process, with control towage stability;
G. the sinking of carrying out conducting oneself with dignity is that master, negative pressure sinking are auxiliary sinking construction;
When h. sinking to described concrete tube wall position, transmit high pressure gas or water under high pressure downwards by described the first pipeline, sinking construction breaks ground; When occur in the sinking process, each subdivision is applied different atmospheric pressures or water pressure is carried out leveling by described the second pipeline;
I. break ground sink down into design height after, carry out grouting operation by the first pipeline on the described concrete tube wall and the second pipeline on the described subdivision, slip casting is concrete grout or high-strength cement mortar;
J. carry at described concrete cylindrical and fill weight etc. in the ballasting and carry out the ballast operation, described weight is water, sandstone or mortar; Simultaneously above described concrete top cover, described concrete cylindrical carries out the operation of jackstone ballast around carrying ballasting.
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| CN103669382A (en) * | 2013-12-19 | 2014-03-26 | 天津港(集团)有限公司 | Installing, leveling and firming method for box-cylinder foundation structure to subside into foundation soil |
| CN103758148A (en) * | 2014-02-13 | 2014-04-30 | 天津大学前沿技术研究院有限公司 | Gravity type offshore wind power foundation capable of towing in self-floating mode and construction method thereof |
| CN103938650A (en) * | 2014-04-10 | 2014-07-23 | 天津大学 | Foundation of cellular subdivision structures |
| CN105735343A (en) * | 2016-03-28 | 2016-07-06 | 中交第三航务工程勘察设计院有限公司 | Floating negative-pressure foundation composite structure |
| CN106013214A (en) * | 2016-07-27 | 2016-10-12 | 天津大学前沿技术研究院有限公司 | Thick-wall composite cylindrical foundation with built-in ground breaking device |
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| CN110004968A (en) * | 2019-03-28 | 2019-07-12 | 天津大学 | A kind of offshore wind farm cylindrical foundation reinforcing method |
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| CN103669382A (en) * | 2013-12-19 | 2014-03-26 | 天津港(集团)有限公司 | Installing, leveling and firming method for box-cylinder foundation structure to subside into foundation soil |
| CN103758148A (en) * | 2014-02-13 | 2014-04-30 | 天津大学前沿技术研究院有限公司 | Gravity type offshore wind power foundation capable of towing in self-floating mode and construction method thereof |
| CN103938650A (en) * | 2014-04-10 | 2014-07-23 | 天津大学 | Foundation of cellular subdivision structures |
| CN105735343A (en) * | 2016-03-28 | 2016-07-06 | 中交第三航务工程勘察设计院有限公司 | Floating negative-pressure foundation composite structure |
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