CN111926846A - Initial deflection correction construction method for sinking bed of deep-water large-section open caisson foundation - Google Patents
Initial deflection correction construction method for sinking bed of deep-water large-section open caisson foundation Download PDFInfo
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- CN111926846A CN111926846A CN202010701103.6A CN202010701103A CN111926846A CN 111926846 A CN111926846 A CN 111926846A CN 202010701103 A CN202010701103 A CN 202010701103A CN 111926846 A CN111926846 A CN 111926846A
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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
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/16—Jointing caissons to the foundation soil, specially to uneven foundation soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D35/00—Straightening, lifting, or lowering of foundation structures or of constructions erected on foundations
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Abstract
The application relates to a construction method for correcting deflection at the initial stage of sinking of a deep-water large-section open caisson foundation, which belongs to the technical field of bridge open caisson construction and comprises the following steps: protecting against riprap, namely, filling rubble into the upstream surface riverbed area of the open caisson foundation, the riverbed areas at two sides of the open caisson foundation and the well hole areas at the upstream surface and two sides of the open caisson foundation for protection; adjusting the water level, namely pumping water to reduce weight of an upstream bay of the open caisson foundation by adopting a front pumping and rear pressing method, and filling water to reduce weight of a downstream bay of the open caisson foundation; and (3) sucking mud at the bottom of the well hole at the downstream of the open caisson foundation by using an air suction dredge, so that the elevation of the river bed at the downstream of the open caisson foundation is reduced. This application adopts the protection of throwing the stone not only can alleviate the washing away of water flow to open caisson basis bottom riverbed, can copy the pad to the upper reaches wellhole simultaneously, reduces the open caisson basis low reaches difference in height. Meanwhile, the deviation rectifying operation is carried out by combining water level adjustment and bottom mud suction, so that the open caisson gradually recovers balance, and the deviation rectifying construction efficiency of the sinking and landing of the open caisson foundation is improved.
Description
Technical Field
The application relates to the technical field of bridge open caisson construction, in particular to a construction method for correcting inclination at the initial stage of sinking of a deep-water large-section open caisson foundation.
Background
Along with the continuous increase of bridge span, the scale of the open caisson foundation is also getting bigger and bigger, the open caisson foundation refers to an empty or multi-chamber well box structure, the dead weight and the soil taking in the well hole are utilized, the open caisson penetrates through the sea (river) covering layer to reach the preset elevation, the foundation is cleaned or the rock surface is processed in the well hole, the underwater concrete is poured to seal the bottom, and the bridge foundation is formed.
The inclination, deviation or torsion of the open caisson often occurs in the process of sinking the open caisson foundation, the inclination of the open caisson is caused by different reasons, the hardness of soil around the open caisson is uneven, and the difference of the soil surface in the open caisson is large due to uneven excavation. The outside of the open caisson is provided with heaps or spoils, and the additional load on the open caisson is unevenly distributed, so that the bias voltage to the well wall is caused. One side of the edge foot of the open caisson is blocked by an obstacle, so that the open caisson foundation is unevenly sunk. The open caisson foundation is naturally washed by water flow, and the height difference between the upstream river bed of the open caisson foundation and the downstream river bed of the open caisson foundation is very large, so that the open caisson foundation is unevenly sunk and landed.
The open caisson foundation is widely applied to large bridge foundations, if inclination occurs, the inclination correction difficulty is very high, immeasurable loss is caused, and how to easily and easily realize the open caisson inclination correction is always the key point of research in the bridge engineering field and needs to be innovatively designed for the inclination correction construction of the open caisson foundation.
Disclosure of Invention
The embodiment of the application provides a construction method for correcting deflection at the initial stage of sinking of a deepwater large-section open caisson foundation, which aims to solve the problem that in the related art, when the open caisson foundation is naturally flushed by water flow, the height difference between the upstream river bed of the open caisson foundation and the downstream river bed of the open caisson foundation is large, so that the open caisson foundation is unevenly sunk.
The embodiment of the application provides a deep water large-section open caisson foundation sinking bed initial-stage deviation rectification construction method, which comprises the following steps:
protecting against riprap, namely, filling rubble into the upstream surface riverbed area of the open caisson foundation, the riverbed areas at two sides of the open caisson foundation, the upstream surface of the open caisson foundation and the well hole areas at two sides of the open caisson foundation for protection;
adjusting the water level, namely pumping water to reduce weight of an upstream bay of the open caisson foundation by adopting a front pumping and rear pressing method, and filling water to reduce weight of a downstream bay of the open caisson foundation until the open caisson foundation is restored to balance;
and (3) sucking mud at the bottom of the well hole at the downstream of the open caisson foundation by using an air suction dredge, and reducing the elevation of the river bed at the downstream of the open caisson foundation until the open caisson foundation is balanced.
In some embodiments: and (3) starting a barge or a belt conveyor to throw and fill broken stones in the upstream surface riverbed area of the open caisson foundation until the height difference between the upstream and downstream of the open caisson foundation is stable.
In some embodiments: and the well hole areas at the upstream and two sides of the open caisson foundation are filled by a grab ship or a belt conveyor, and the outside of the well hole is directly filled by an open barge.
In some embodiments: and the riverbed areas on the two sides of the open caisson foundation adopt open barges or a floating crane matched with a flat barge to throw and fill bagged broken stones.
In some embodiments: and key protection areas are arranged at the riverbed positions at two corners of the water-facing surface of the open caisson foundation, and the key protection areas are filled with bagged broken stones by opening a barge or matching a floating crane with a flat-bed barge.
In some embodiments: the air suction dredge comprises a dredge and an air compressor, the dredge is hung in a downstream well hole of the open caisson foundation, the dredge sucks and discharges silt at the bottom area of a downstream bulkhead of the open caisson foundation, and the blade foot area of the open caisson foundation does not suck mud.
In some embodiments: the method further comprises the steps of:
and (3) pouring well wall concrete, after the attitude of the open caisson foundation is stable, arranging a concrete pouring platform at the top of the downstream well hole of the open caisson foundation, and pouring underwater concrete for the open caisson well wall to weigh by adopting a vertical conduit ball pulling method in sequence from the downstream compartment to the upstream compartment.
In some embodiments: the open caisson foundation is a steel open caisson.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a construction method for correcting deflection at the initial stage of sinking bed of a deep-water large-section open caisson foundation, which adopts rubble protection and carries out rubble protection in an upstream face riverbed area of the open caisson foundation, riverbed areas at two sides of the open caisson foundation and well hole areas at the upstream face and two sides of the open caisson foundation; adjusting the water level, namely pumping water to reduce weight of an upstream bay of the open caisson foundation by adopting a front pumping and rear pressing method, and filling water to reduce weight of a downstream bay of the open caisson foundation until the open caisson foundation is restored to balance; and (3) sucking mud at the bottom of the well hole at the downstream of the open caisson foundation by using an air suction dredge, and reducing the elevation of the river bed at the downstream of the open caisson foundation until the open caisson foundation is balanced.
Therefore, the deflection correcting construction method adopts the riprap protection to reduce the scouring of the water flow force to the riverbed at the bottom of the upstream face of the open caisson foundation, protects the riverbed of the open caisson foundation from being scoured and damaged by the water flow force, and ensures that the riverbed at the bottom of the open caisson foundation is flat. By throwing and filling broken stones in the upstream face riverbed area of the open caisson foundation, the riverbed areas on two sides of the open caisson foundation and the well hole areas on the upstream face and two sides of the open caisson foundation for protection, the erosion of the water flow force on the upstream face and the side face of the open caisson foundation can be obviously reduced, the upper and lower well holes can be dug and cushioned in the process of inclination correction of the open caisson, and the height difference between the upper and lower positions of the open caisson foundation can be reduced. The method combines the water level adjustment of the upstream compartment and the downstream compartment and the bottom hole mud suction mode of the downstream well hole to carry out the deviation rectifying operation on the open caisson foundation, so that the open caisson gradually recovers balance, and the deviation rectifying construction efficiency of the open caisson foundation sinking and landing is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a plan view of the upstream river bed area filled with crushed stones of the open caisson foundation according to the embodiment of the present invention;
fig. 2 is a plan view of the open caisson foundation according to the embodiment of the present invention, with gravel being dumped in the region of the well bore on the upstream and both sides;
fig. 3 is a plan view of the riverbed areas on both sides of the open caisson foundation according to the embodiment of the present invention.
Reference numerals:
10. an open caisson foundation; 11. underwater concrete for the wall of the open caisson; 12. an upstream wellbore; 13. a downstream wellbore; 14. an upstream riverbed area; 15. a key protection area; 16. a wellbore region; 17. two side riverbed areas; 18. downstream compartment, 19, upstream compartment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a construction method for correcting deflection at the initial stage of sinking of a deep-water large-section open caisson foundation, which can solve the problem that in the related art, the open caisson foundation is not balanced in sinking due to the fact that the open caisson foundation is naturally flushed by water flow and the difference between the height of an upstream river bed of the open caisson foundation and the height of a downstream river bed of the open caisson foundation is large.
Referring to fig. 1 to 3, an embodiment of the present application provides an initial deflection correction construction method for a deep water large-section open caisson foundation sinking bed, including the following steps:
s1, protecting against riprap, and protecting against riprap in the upstream surface riverbed area 14 of the open caisson foundation 10, the riverbed areas 17 at the two sides of the open caisson foundation 10 and the well hole areas 16 at the upstream surface and the two sides of the open caisson foundation 10; the riprap protection is adopted to reduce the scouring of the water flow force to the river bed at the bottom of the open caisson foundation 10, so as to cover the river bed, protect the river bed at the bottom of the open caisson foundation 10 from being scoured and damaged by the water flow force, and ensure that the river bed at the bottom of the open caisson foundation 10 is flat. Broken stones are thrown and filled in the upstream face riverbed area 14 of the open caisson foundation 10, the riverbed areas 17 on the two sides of the open caisson foundation 10 and the well hole areas 16 on the upstream face and the two sides of the open caisson foundation 10 for protection, so that the washing of the water flow force on the riverbed at the bottom of the open caisson foundation 10 can be obviously relieved, the bottom of the upstream well hole 12 can be shoveled and cushioned in the open caisson inclination correcting process, and the upstream and downstream height difference of the open caisson foundation 10 is gradually reduced.
And S2, adjusting the water level, pumping water to reduce the weight of the upstream compartment 19 of the open caisson foundation 10 by adopting a front pumping and rear pressure method, and irrigating water to reduce the weight of the downstream compartment 18 of the open caisson foundation 10 until the open caisson foundation 10 is balanced. The water levels in the upstream compartment 19 and the downstream compartment 18 are adjusted by adopting a method of front pumping and rear pressing, the water pumping is carried out in the upstream compartment 19 of the open caisson foundation 10, the method of water irrigation in the downstream compartment 18 is matched with the open caisson foundation 10 to gradually restore balance, the effect of keeping balance of the open caisson foundation in water is achieved, and therefore the problem that the balance of the open caisson foundation 10 is influenced due to the fact that the difference between the water levels inside and outside the open caisson foundation 10 does not meet the requirement is solved.
S3, sucking mud at the bottom of the well, sucking mud at the bottom of the downstream well hole 13 of the open caisson foundation 10 by using an air suction dredge, and reducing the elevation of the downstream river bed of the open caisson foundation 10 until the open caisson foundation 10 is balanced. The air suction dredge comprises a dredge and an air compressor, the air compressor provides power for the dredge, the dredge is hung in a downstream well hole 13 of the open caisson foundation 10, the dredge sucks and discharges silt at the bottom area of a downstream bulkhead 18 of the open caisson foundation 10, and mud is not sucked in the blade foot area of the open caisson foundation 10. The bottom elevation of the downstream well hole 13 of the open caisson foundation 10 is reduced by circularly sucking mud in the bottom of the downstream well hole 13 of the open caisson foundation 10 and sucking mud by using an air suction dredge, so that the effects of improving the bottom supporting condition of the open caisson foundation 10 and adjusting the posture of the open caisson foundation 10 are achieved, and the problem that the bottom supporting condition of the open caisson foundation 10 is influenced by more mud in part of well holes is solved.
Because the open caisson foundation 10 is an entity wading building, partial scouring with different degrees can occur near the open caisson foundation 10 under the action of water flow after the open caisson foundation 10 is implanted, and the stronger the power condition is, the more obvious the partial scouring is; local backwater is formed right in front of the upstream surface of the open caisson foundation 10, eddy currents are generated on two sides of the open caisson foundation 10, and cross wake flows are formed on the back surface of the open caisson foundation 10. The bottom of the open caisson foundation 10 is not overflowed, and the local scouring of the open caisson foundation 10 is in a goose-wing shape extending towards two sides of the open caisson foundation 10, and the position of the maximum punching depth usually occurs at the bottom and two side corners of the water-facing surface of the open caisson foundation 10.
The method comprises the steps that broken stone is filled in an upstream face riverbed area 14 of the open caisson foundation 10, riverbed areas 17 on two sides of the open caisson foundation 10 and well hole areas 16 on the upstream face and two sides of the open caisson foundation 10 for protection; the riprap protection is adopted to reduce the scouring depth of the water flow force to the riverbed at the bottom of the upstream face of the open caisson foundation 10, and a covering layer is formed to protect the riverbed at the bottom of the open caisson foundation 10 from being scoured and damaged by the water flow force, ensure that the riverbed at the bottom of the open caisson foundation 10 is flat, and pre-protect the stable landing and sinking of the open caisson foundation 10.
In some alternative embodiments: referring to fig. 1 to 3, in the embodiment of the present application, an initial inclination correction construction method for a deep water large-section open caisson foundation sinking bed is provided, in which an upstream river bed area 14 of the open caisson foundation 10 is filled with crushed stones by using a barge or a belt conveyor, and the crushed stones are filled until the height difference between the upstream and downstream of the open caisson foundation 10 is stable. And the upstream riverbed area 14 of the open water surface of the open caisson foundation 10 is filled with broken stones by starting a barge or a belt conveyor, and the broken stones filled in the area are used for reducing the water flow force to wash the front surface of the open caisson foundation 10, so that the upstream riverbed at the bottom of the open caisson foundation 10 is protected from being washed and damaged by the water flow force, and the riverbed at the bottom of the open caisson foundation 10 is ensured to be flat. When the broken stones are dumped and filled, the operation is carried out in the time period with the minimum water flow velocity, and the dumped and filled broken stones are ensured to sink to the set upstream surface river bed area 14.
Once the riverbed at the bottom of the upstream surface of the open caisson foundation 10 is washed to form a washing pit, the riverbed elevation of the upstream surface of the open caisson foundation 10 is lower than that of the riverbed elevation of the back surface of the open caisson foundation 10, and the sinking depth of the upstream well hole 12 of the open caisson foundation 10 is greater than that of the downstream well hole 13, so that the open caisson foundation 10 inclines towards the upstream surface. According to the open-top water bed area 14 of the open caisson foundation, the barge or the belt conveyor is started to throw and fill the broken stones, the erosion depth of the water flow force to the bed at the bottom of the open-top water surface of the open caisson foundation 10 can be obviously reduced by throwing and filling the broken stones, the height difference of the up-stream and the down-stream of the open caisson foundation 10 is reduced, and therefore the problem that the open caisson inclination is caused by the fact that the water flow force erodes the open-top water bed area 14 at the bottom of the open caisson foundation 10 is solved.
The riverbed areas 17 at the two sides of the open caisson foundation 10 are filled with bagged broken stones by opening a barge or by matching a floating crane with a flat-bed barge. The barge is opened or the floating crane is matched with the flat-bed barge to throw and fill bagged broken stones in the riverbed areas 17 on the two sides of the open caisson foundation 10, the bagged broken stones thrown and filled in the areas are used for reducing the water flow force to wash the riverbed at the bottom of the side face of the open caisson foundation 10, the riverbeds on the two sides of the open caisson foundation 10 are protected from being washed and damaged by the water flow force of eddy motion, the riverbed at the bottom of the open caisson foundation 10 is ensured to be flat, and the deviation of the open caisson foundation 10 caused by the great height difference of the riverbeds on the two sides of the open caisson foundation 10 is avoided.
Gravel in the well bore area 16 upstream and on both sides of the open caisson foundation is dumped using a grab boat or belt conveyor, and gravel outside the well bore is dumped directly by opening the barge. And (3) throwing and filling broken stones in the upstream and two side well hole areas 16 of the open caisson foundation by using a grab bucket ship or a belt conveyor, wherein the broken stones thrown and filled in the areas are used for covering and reinforcing the riverbed of the upstream and two side well hole areas 16 of the open caisson foundation from being washed by water flow, and simultaneously, the bottom plate of the upstream well hole 12 can be shoveled and cushioned in the process of correcting the open caisson, so that the height difference between the upstream and the downstream of the open caisson foundation 10 is reduced.
In some alternative embodiments: referring to fig. 1, the embodiment of the application provides an initial inclination correction construction method for a deep-water large-section open caisson foundation sinking into a bed, wherein key protection areas 15 are arranged at two upstream corner riverbed positions of the open caisson foundation 10, and the key protection areas 15 are filled with bagged broken stones by opening a barge or by matching a floating crane with a flat-bed barge. The bagged broken stones dumped and filled in the area are used for reducing the scouring of water flow force on the two corner riverbed positions at the bottom of the water-facing surface of the open caisson foundation 10, the two corner riverbed positions of the open caisson foundation 10 are the areas with the largest water flow velocity and the largest water flow, and the flushing capacity of the water flow force can be obviously reduced by the bagged broken stones dumped and filled in the area. The bagged broken stone has large volume and self weight and can play a role in preventing the water flow force from scouring.
After the open caisson foundation 10 enters water, the original smooth water flow is blocked by the open caisson foundation 10, the water flow structure around the open caisson foundation 10 is changed rapidly, the flow line is bent rapidly by the streaming of the water flow, a vortex is formed near the open caisson foundation 10, the water flow scours the upstream riverbed of the open caisson foundation 10 and the surrounding sediment violently, and then a local scouring pit is formed. After the open caisson foundation 10 is planted, the maximum depth-of-attack area is located near the corner riverbeds at the two sides of the water-facing surface of the open caisson foundation 10, the local silt height is formed under the water-facing surface of the open caisson foundation 10 due to the choked flow of the open caisson foundation 10, and the maximum scouring depth is generated at the positions of the corner riverbeds at the water-facing surface of the open caisson foundation 10. Therefore, key protection areas 15 are arranged near the corner riverbeds at the two sides of the bottom of the water-facing surface of the open caisson foundation 10, and bagged broken stones filled in the areas are used for reducing the water flow force to wash the positions of the corner riverbeds at the bottom of the water-facing surface of the open caisson foundation 10.
In some alternative embodiments: referring to fig. 1 to 3, an embodiment of the present application provides an initial inclination correction construction method for a deep-water large-section open caisson foundation sinking bed, where the method further includes the following steps:
s4, pouring well wall concrete, wherein the open caisson foundation 10 is a steel open caisson, after the attitude of the open caisson foundation 10 is stable, a concrete pouring platform is arranged on the top of a downstream well hole 13 of the open caisson foundation 10, and the open caisson wall underwater concrete 11 is poured and weighed in sequence by adopting a vertical conduit ball pulling method, namely firstly pouring the downstream compartment 18 and then pouring the upstream compartment 19; and pouring the underwater concrete 11 of the open caisson wall into the compartment 18 at the downstream of the open caisson base 10 to accelerate the sinking depth of the well hole 13 at the downstream of the open caisson base 10 and balance the sinking depth of the well hole 12 at the upstream of the open caisson base 10 and the sinking depth of the well hole 13 at the downstream of the open caisson base 10.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A construction method for initial deflection correction of a sinking bed of a deep-water large-section open caisson foundation is characterized by comprising the following steps:
protecting against riprap, namely, filling rubble into an upstream surface riverbed area (14) of the open caisson foundation, riverbed areas (17) on two sides of the open caisson foundation and a well hole area (16) on the upstream surface and two sides of the open caisson foundation for protection;
adjusting the water level, namely pumping water to reduce the weight of an upstream bulkhead (19) of the open caisson foundation (10) by adopting a front pumping and rear pressing method, and filling water to reduce the weight of a downstream bulkhead (18) of the open caisson foundation (10) until the open caisson foundation (10) is restored to balance;
and (3) sucking mud at the bottom of the well hole (13) at the downstream of the open caisson foundation (10), and sucking mud by using an air suction dredge to reduce the elevation of the river bed at the downstream of the open caisson foundation (10) until the open caisson foundation (10) is balanced.
2. The initial-stage deviation rectification construction method for the sinking bed of the deep-water large-section open caisson foundation as claimed in claim 1, is characterized in that:
and the upstream surface riverbed area (14) of the open caisson foundation adopts a barge or a belt conveyor to throw and fill the broken stones until the height difference between the upstream and the downstream of the open caisson foundation (10) is stable.
3. The initial-stage deviation rectification construction method for the sinking bed of the deep-water large-section open caisson foundation as claimed in claim 1, is characterized in that:
and well hole areas (16) at the upstream and two sides of the open caisson foundation are dumped by a grab bucket ship or a belt conveyor, and the well holes are directly dumped by an open barge.
4. The initial-stage deviation rectification construction method for the sinking bed of the deep-water large-section open caisson foundation as claimed in claim 1, is characterized in that:
and riverbed areas (17) on two sides of the open caisson foundation adopt an open barge or a floating crane matched with a flat-bed barge to throw and fill bagged broken stones.
5. The initial-stage deviation rectification construction method for the sinking bed of the deep-water large-section open caisson foundation as claimed in claim 1, is characterized in that:
key protection areas (15) are arranged at two corner riverbed positions on the upstream surface of the open caisson foundation (10), and the key protection areas (15) are filled with bagged broken stones by opening a barge or matching a floating crane with a flat-bed barge.
6. The initial-stage deviation rectification construction method for the sinking bed of the deep-water large-section open caisson foundation as claimed in claim 1, is characterized in that:
the air suction dredge comprises a dredge and an air compressor, the dredge is hung in a downstream well hole (13) of the open caisson foundation (10), the dredge sucks and discharges silt at the bottom area of a downstream bay (18) of the open caisson foundation (10), and mud is not sucked in a blade foot area of the open caisson foundation (10).
7. The initial deflection correction construction method for the sinking bed of the deep water large-section open caisson foundation as claimed in claim 1, wherein the method further comprises the following steps:
pouring well wall concrete, after the open caisson foundation (10) is stable in posture, arranging a concrete pouring platform at the top of a downstream well hole (13) of the open caisson foundation (10), and pouring the underwater concrete (11) of the open caisson wall in sequence from a downstream compartment (18) to an upstream compartment (19) by adopting a vertical conduit ball pulling method to weigh.
8. The initial-stage deviation rectification construction method for the sinking bed of the deep-water large-section open caisson foundation as claimed in claim 1, is characterized in that:
the open caisson foundation (10) is a steel open caisson.
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| CN202010701103.6A CN111926846A (en) | 2020-07-20 | 2020-07-20 | Initial deflection correction construction method for sinking bed of deep-water large-section open caisson foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117166529A (en) * | 2023-11-03 | 2023-12-05 | 中国海洋大学 | GFRP suction barrel foundation penetration device and penetration method |
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