CN111456066A - Novel self-correcting open caisson and correcting method thereof - Google Patents
Novel self-correcting open caisson and correcting method thereof Download PDFInfo
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- CN111456066A CN111456066A CN202010177392.4A CN202010177392A CN111456066A CN 111456066 A CN111456066 A CN 111456066A CN 202010177392 A CN202010177392 A CN 202010177392A CN 111456066 A CN111456066 A CN 111456066A
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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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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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
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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 invention discloses a novel self-correcting open caisson and a correcting method thereof, belonging to the technical field of bridge open caisson foundations and comprising the following steps: the open caisson is internally provided with a plurality of well bores arranged in a matrix form, two adjacent well bores are separated by a well bore wall of the open caisson, the well bore positioned at the inner ring of the open caisson is a closed well bore, and the well bore positioned at the outer ring of the open caisson is a self-correcting well bore; the bottom sealing concrete plate is plugged at the bottom of the open caisson; the open caisson top cover is positioned at the top of the open caisson, the open caisson top cover is provided with a sand injection drain hole, the sand injection drain hole is communicated with the self-deviation-correcting well hole, and the sand injection drain hole is used for injecting sand and stone into the self-deviation-correcting well hole or draining water. According to the self-deviation-correcting open caisson, namely the deviation correcting method, water is pumped in the self-deviation-correcting well hole in the inclination direction to reduce the weight according to the inclination direction of the open caisson, sand and stone are injected into the self-deviation-correcting well hole opposite to the inclination direction to increase the weight, reverse direction loading is realized, the open caisson generates anti-inclination bending moment, and deviation correction of the open caisson foundation is realized.
Description
Technical Field
The invention relates to the technical field of bridge open caisson foundations, in particular to a novel self-correcting open caisson and a correcting method thereof.
Background
Along with the continuous increase of bridge span, the scale of the open caisson foundation is also getting larger and larger, 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, the penetration of the sea (river) water depth and the covering layer are utilized to reach the preset elevation, the foundation is cleaned or the rock surface is processed in the well hole, and the underwater concrete is poured to seal the bottom, so that the bridge foundation is formed. According to different construction methods, the method can be divided into a plurality of categories such as island construction sinking heavy open caisson, floating transportation sinking self-floating open caisson, floating transportation direct self-floating open caisson and the like. The open caisson foundation is characterized in that the embedding depth can be very large, the integrity is strong, the stability is good, the bearing area is large, and the open caisson foundation can bear large vertical load and horizontal load; the open caisson is not only a foundation, but also a cofferdam structure for retaining soil and retaining water during construction. The open caisson foundation has the characteristics of high rigidity, strong horizontal load resistance and high vertical bearing capacity.
The open caisson foundation is widely applied to large bridge foundations, if the open caisson foundation is inclined, the deviation rectifying difficulty is extremely high, immeasurable loss is caused, and how to simply and easily realize open caisson deviation rectifying is always the key point of research in the bridge engineering field and needs to be innovatively designed.
Disclosure of Invention
The invention aims to overcome the defect of great deviation rectifying difficulty of the open caisson in the background technology, and provides a novel self-correcting open caisson and a deviation rectifying method thereof.
The invention provides a novel self-correcting sunk well in a first aspect, which comprises:
the open caisson is internally provided with a plurality of well bores arranged in a matrix form, two adjacent well bores are separated by a well bore wall of the open caisson, the well bore positioned at the inner ring of the open caisson is a closed well bore, and the well bore positioned at the outer ring of the open caisson is a self-correcting well bore;
the bottom sealing concrete plate is plugged at the bottom of the open caisson;
the open caisson top cover is positioned at the top of the open caisson, the open caisson top cover is provided with a sand injection drain hole, the sand injection drain hole is communicated with the self-deviation-correcting well hole, the sand injection drain hole protrudes above the open caisson top cover, and the sand injection drain hole is used for injecting sand and stone into the self-deviation-correcting well hole or draining water.
The preferred scheme is as follows: and water is filled in the closed well hole, and the closed well hole and the open caisson top cover form a closed structure.
The preferred scheme is as follows: the cross section of the self-correcting well hole is the same in shape and size.
The preferred scheme is as follows: at least two sand injection drain holes communicated with the self-correcting well holes are formed, and top covers are arranged at the tops of the sand injection drain holes.
The preferred scheme is as follows: the open caisson is in an axis symmetrical structure or a central symmetrical structure along X, Y.
The second aspect of the invention provides a novel deviation rectifying method for a self-rectifying open caisson, which comprises the following steps:
taking soil at the bottom of the open caisson, and sinking the open caisson to a set elevation;
pouring a bottom sealing concrete slab underwater, and plugging the bottom of the open caisson;
injecting water into the closed well hole and the self-correcting well hole to increase the weight, and accelerating the sedimentation in the open caisson construction period;
constructing a top cover of the open caisson at the top of the open caisson, and reserving a sand injection drain hole communicated with the self-correcting well hole on the top cover of the open caisson;
when the open caisson is unevenly settled or inclined, pumping water in the self-deviation-correcting well hole in the inclined direction to reduce weight, injecting sand and stone into the self-deviation-correcting well hole opposite to the inclined direction to increase weight, and generating an anti-inclination bending moment M by the open caissonRqAnd the self-correction of the open caisson is realized.
The preferred scheme is as follows: the open caisson generates anti-inclination bending moment MRqBending moment M related to inclinationqDetermination of phase equilibrium, anti-tilting bending moment MRqBending moment M related to inclinationqAre substantially the same.
The preferred scheme is as follows: the anti-inclination bending moment MRqThe following formula is calculated:
MRq＝∑(Gsixicosα+Gsihsisinα+Gwixicosα+Gwihwisinα) (1)
in the above formula:
MRq: injecting sand into the deviation correcting well hole to increase weight, and increasing or reducing the sum of bending moments of the weight relative to the center of the open caisson base after pumping water and reducing weight;
Gsi: the weight of the ith row of self-correcting well hole after sand is injected is increased relative to the original self-correcting well hole, namely the weighted self-correcting well hole is the difference between the weight of the sand injected into the well hole and the weight of the discharged water;
Gwi: the weight of the ith row of self-correcting well holes is reduced relative to the original self-correcting well holes after water is pumped, namely the weight of the reduced self-correcting well holes is the weight of the pumped water;
xi: the distance from the center of the ith row of self-correcting well holes to the Y axis of the open caisson;
hsi: after sand is injected into the ith row of self-deviation correcting well holes, the vertical distance between the gravity center of the sand and the center of the open caisson substrate is increased in the self-deviation correcting well holes;
hwi: the vertical distance between the gravity center of water pumped out of the self-deviation-correcting well hole and the center of the open caisson substrate after the water is pumped out of the ith row of self-deviation-correcting well holes;
α rotation angle of the open caisson base relative to Y/X axis, i.e. the ratio of the settlement difference of two sides of the open caisson to the length of the open caisson.
α, because the ratio of the settling difference of two sides of the sinking well to the length of the sinking well is small, α can be approximate to 0 in estimation calculation, so the formula I can be simplified to the formula II:
MRq＝∑(Gsixi+Gwixi) (2)
after the deviation is corrected, the open caisson does not produce additional settlement any more, so the weight of the open caisson is basically kept unchanged, namely the weight of the poured sand and the pumped water are basically equal, and the formula three is met:
∑Gsi＝∑Gwi(3)
tilting moment MqBending moment for causing inclination of open caisson by resisting inclination bending moment MRqEqual to the tilting moment MqThe weight of sand injected into the self-correcting well can be preliminarily determined; in the process of correcting deviation, the deviation-resisting bending moment MRq＝(1～1.5)MqObtaining deviation correcting starting bending moment, simultaneously monitoring the open caisson attitude recovery process, and immediately discharging sand and stones in the self-deviation correcting well hole after the open caisson attitude is corrected to realize MRq＝MqAnd the later attitude stability of the open caisson is ensured.
The preferred scheme is as follows: the sand injection drainage holes communicated with the self-deviation-correcting well hole are at least two, when sand is injected into the self-deviation-correcting well hole through one sand injection drainage hole, water in the self-deviation-correcting well hole is pumped out through the other sand injection drainage hole, the sand injection speed is accelerated, and the two sand injection drainage holes are exchanged to reduce the height difference of the sand surface in the self-deviation-correcting well hole.
On the basis of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention relates to a novel self-correcting sunk well, which is characterized in that a plurality of well holes arranged in a matrix form are arranged in the self-correcting sunk well, the well hole positioned on the inner ring of the sunk well is a closed well hole, and the well hole positioned on the outer ring of the sunk well is a self-correcting well hole. The closed well hole is used for stabilizing the gravity center of the open caisson, and the self-correcting well hole is used for correcting the open caisson. When the open caisson is unevenly settled or inclined, water is pumped in the self-deviation-correcting well hole in the inclined direction to reduce weight, sand and stone are injected into the self-deviation-correcting well hole opposite to the inclined direction to increase weight, so that reverse loading is realized, the open caisson generates anti-inclination bending moment, and the deviation correction of the open caisson foundation is realized. The self-correcting sunk well is simple in structural design and clear in correction principle, and can be suitable for correcting deviation of the sunk well in all directions.
According to the deviation rectifying method of the novel self-deviation rectifying open caisson, when the open caisson is unevenly settled or inclined, sand and stone are injected into the self-deviation rectifying well hole opposite to the inclined direction to increase the weight by reducing the weight of water in the self-deviation rectifying well hole in the inclined direction, so that deviation rectification is realized. Injecting into grit weight accessible anti-tilt bending moment and the tilt bending moment of inclining from rectifying the deviation borehole and equaling and carrying out preliminary definite, the purpose that can simple and convenient realization open caisson rectified deviation, the simple operation, the effect is obvious, is showing and has reduced the open caisson degree of difficulty of rectifying, has greatly practiced thrift time limit for a project and cost.
Drawings
FIG. 1 is a schematic structural diagram of a self-correcting caisson according to an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a schematic diagram of the principle of correcting the deviation of the self-correcting open caisson according to the embodiment of the invention;
FIG. 5 is a schematic elevation view illustrating the calculation of the anti-inclination bending moment of the self-correcting caisson according to the embodiment of the present invention;
fig. 6 is a schematic plane view of the self-correcting caisson for calculating anti-inclination bending moment according to the embodiment of the invention.
Reference numerals: 1-open caisson wall, 2-bottom sealing concrete plate, 3-open caisson top cover, 4-closed well hole, 5-self-correcting well hole and 6-sand injection drain hole.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is to be noted that all the figures are exemplary representations. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Example 1
Referring to fig. 1 to 3, an embodiment of the present invention provides a novel self-correcting open caisson, including:
the open caisson is provided with a plurality of well bores arranged in a matrix form, and two adjacent well bores are separated by a well wall 1 of the open caisson. For convenience of description, the present embodiment takes the open caisson having a square structure which is symmetrical along the X, Y axis and symmetrical at the center as an example, but the open caisson may also have a polygonal, rectangular or circular structure.
The open caisson of the embodiment is provided with four well bores along the X-axis direction of the open caisson, four well bores along the Y-axis direction of the open caisson, the well bores in the open caisson are sixteen holes in total, and the well bores in the open caisson are provided with two circles from inside to outside. The well hole positioned at the inner ring of the open caisson is a closed well hole 4, the closed well hole 4 has four holes in total, the closed well holes 4 are closed and not communicated with each other, the well hole positioned at the outer ring of the open caisson is a self-correcting well hole 5, the self-correcting well hole 5 has twelve holes in total, and the cross section shapes and the sizes of the self-correcting well holes 5 are the same.
And the bottom sealing concrete plate 2 is plugged at the bottom of the open caisson and used for sealing the open caisson to isolate water outside the open caisson from entering the open caisson and provide a waterless environment for the open caisson.
Open caisson top cap 3, open caisson top cap 3 is located the top of open caisson, and the enclosed construction is constituteed with open caisson top cap 3 to closed wellhole 4, fills with water in the closed wellhole 4, plays the effect of stable focus to the open caisson.
The open caisson top cover 3 is provided with a sand injection drain hole 6, the sand injection drain hole 6 is communicated with the self-deviation-correcting well hole 5, in order to improve the efficiency of injecting sand and stone into the self-deviation-correcting well hole 5 and draining water, at least two sand injection drain holes 6 are arranged in the self-deviation-correcting well hole 5, and the top of each sand injection drain hole 6 is provided with a top cover. The sand injection drain hole 6 protrudes above the open caisson top cover 3, so that water outside the open caisson is prevented from entering the self-deviation-correcting well hole 5, and the sand injection drain hole 6 is used for injecting sand and stone into the self-deviation-correcting well hole 5 or draining water.
Principle of operation
Referring to fig. 4, the self-correcting caisson of the present invention has a plurality of well bores arranged in a matrix form, wherein the well bore located at the inner ring of the caisson is a closed well bore 4, and the well bore located at the outer ring of the caisson is a self-correcting well bore 5. The closed well hole 4 and the open caisson top cover 3 form a closed structure, water is filled in the closed well hole 4, the effect of stabilizing the gravity center of the open caisson is achieved, and the self-correcting well hole 5 is used for correcting the deviation of the open caisson.
When the open caisson is unevenly settled or inclined, water in the self-deviation-correcting well hole 5 in the inclined direction is extracted to reduce weight, sand and stone are injected into the self-deviation-correcting well hole 5 opposite to the inclined direction to increase weight, so that reverse loading is realized, the open caisson generates anti-inclination bending moment, and the deviation correction of the open caisson foundation is realized. The self-correcting open caisson has simple structural design and clear correction principle, and can be suitable for correcting the inclination of each direction of the open caisson.
Example 2
Referring to fig. 1 to 4, an embodiment of the present invention provides a deviation rectifying method for a novel self-deviation rectifying open caisson, including the following steps:
And 2, pouring a bottom sealing concrete plate 2 underwater, plugging the bottom of the open caisson, and isolating water outside the open caisson from entering the open caisson to provide a waterless environment for the open caisson.
And 3, injecting water into the closed well hole 4 and the self-correcting well hole 5 to increase the weight, and accelerating the sedimentation in the open caisson construction period.
And 4, constructing a top cover 3 of the open caisson at the top of the open caisson, reserving sand injection drain holes 6 communicated with the self-correcting well hole 5 on the top cover 3 of the open caisson, and at least two sand injection drain holes 6 are arranged in the self-correcting well hole 5 in order to improve the efficiency of injecting sand and stone into the self-correcting well hole 5 and draining water.
Example 3
Referring to fig. 5 to 6, an embodiment of the present invention provides a deviation rectifying method for a novel self-deviation rectifying open caisson, and the difference between the embodiment and the embodiment 2 is: anti-inclination bending moment M generated by open caissonRqBending moment M related to inclinationqDetermination of phase equilibrium, anti-tilting bending moment MRqBending moment M related to inclinationqAre substantially the same.
Wherein the bending moment M resists inclinationRqThe following formula is calculated:
MRq＝∑(Gsixicosα+Gsihsisinα+Gwixicosα+Gwihwisinα) (1)
in the above formula:
MRq: and injecting sand into the deviation correcting well hole 5 to increase weight, and increasing or reducing the sum of bending moments of the weight relative to the center of the open caisson base after pumping water and reducing weight.
Gsi: and (3) increasing the weight of the ith self-correcting well hole after sand or gravel is injected into the ith self-correcting well hole relative to the original self-correcting well hole 5, namely the weight of the weighted self-correcting well hole 5 is the difference between the weight of the sand filled into the well hole and the weight of the discharged water.
Gwi: and after water is pumped in the ith self-correcting well hole 5, the weight of the ith self-correcting well hole is reduced relative to that of the original self-correcting well hole, namely the weight of the reduced self-correcting well hole 5 is the weight of the extracted water.
xi: the ith row is the horizontal distance from the center of the deviation correction well 5 to the Y-axis of the open caisson.
hsi: and after sand or gravel is injected into the ith row of self-correcting well hole 5, the vertical distance between the center of gravity of the sand or gravel and the center of the base of the open caisson is increased in the self-correcting well hole 5.
hwi: and the vertical distance between the gravity center of water extracted from the deviation rectifying well hole 5 and the center of the base of the open caisson after the water is pumped from the deviation rectifying well hole 5 in the ith row.
α rotation angle of the open caisson base relative to Y/X axis, i.e. the ratio of the settlement difference of two sides of the open caisson to the length of the open caisson.
Since the ratio of the settling difference of the two sides of the sinking well to the length of the sinking well is very small, α can be approximately 0 in estimation, so the formula one can be simplified as the formula two:
MRq＝∑(Gsixi+Gwixi) (2)
after the deviation is corrected, the open caisson should not generate additional settlement, so the weight of the open caisson should be basically kept unchanged, namely the weight of the poured sand or broken stone is basically equal to the weight of pumped water, namely the formula three is met:
∑Gsi＝∑Gwi(3)
tilting moment MqBending moment for causing inclination of open caisson by resisting inclination bending moment MRqEqual to the tilting moment MqThe weight of sand injected into the self-correcting wellbore 5 can be preliminarily determined. In the process of correcting deviation, the deviation-resisting bending moment MRq＝(1～1.5)MqTo obtain the deviation correcting starting bending moment, and at the same time, the open caisson attitude recovery process should be monitored, and after the open caisson attitude is corrected, the sand and stone in the self-correcting well hole 5 should be immediately discharged, so as to implement MRq＝MqTo ensure the open caissonAnd the later-stage attitude stabilization tilting moment, the tilting moment and the tilting moment.
Example 4
The embodiment of the invention provides a novel deviation rectifying method for a self-rectifying open caisson, which is different from the embodiment 2 in that: when sand or gravel is injected into the upward inclined self-correcting well hole 5 to increase the weight, one sand injection drain hole 6 injects the sand or gravel into the self-correcting well hole 5, and the other sand injection drain hole 6 extracts water in the self-correcting well hole 5, so that the speed of injecting the sand or gravel is increased. The two sand injection and drainage holes 6 can be operated alternatively, so that the height difference of sand or gravel surfaces in the self-correcting well 5 can be reduced.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (10)
1. The utility model provides a novel from rectifying open caisson which characterized in that includes:
the open caisson is internally provided with a plurality of well bores arranged in a matrix form, two adjacent well bores are separated by a well bore wall (1) of the open caisson, the well bore positioned at the inner ring of the open caisson is a closed well bore (4), and the well bore positioned at the outer ring of the open caisson is a self-correcting well bore (5);
the bottom sealing concrete plate (2), the bottom sealing concrete plate (2) is plugged at the bottom of the open caisson;
the open caisson structure comprises an open caisson top cover (3), wherein the open caisson top cover (3) is located at the top of the open caisson, a sand injection drain hole (6) is formed in the open caisson top cover, the sand injection drain hole (6) is communicated with a self-deviation-correcting well hole (5), the sand injection drain hole (6) protrudes above the open caisson top cover (3), and the sand injection drain hole (6) is used for injecting sand and stone into the self-deviation-correcting well hole (5) or draining water.
2. The novel self-correcting caisson of claim 1, wherein:
the closed well hole (4) is filled with water, and the closed well hole (4) and the open caisson top cover (3) form a closed structure.
3. The novel self-correcting caisson of claim 1, wherein:
the cross-sectional shape and size of the self-correcting well holes (5) are the same.
4. The novel self-correcting caisson of claim 1, wherein:
at least two sand injection drainage holes (6) communicated with the self-correcting well hole (5) are arranged, and a top cover is arranged at the top of each sand injection drainage hole (6).
5. The novel self-correcting caisson of claim 1, wherein:
the open caisson is in an axis symmetrical structure or a central symmetrical structure along X, Y.
6. The novel deviation rectifying method for the self-deviation rectifying open caisson according to any one of claims 1 to 5, characterized by comprising the following steps:
taking soil at the bottom of the open caisson, and sinking the open caisson to a set elevation;
pouring a bottom sealing concrete slab (2) underwater, and plugging the bottom of the open caisson;
injecting water into the closed well hole (4) and the self-correcting well hole (5) to increase weight, and accelerating sedimentation in the open caisson construction period;
constructing a top cover (3) of the open caisson at the top of the open caisson, and reserving a sand injection drain hole (6) communicated with a self-correcting well hole (5) on the top cover (3) of the open caisson;
when the open caisson is unevenly settled or inclined, water in the self-correcting well hole (5) in the inclined direction is extracted to reduce weight, sand and stone are injected into the self-correcting well hole (5) opposite to the inclined direction to increase weight, and the open caisson generates anti-inclination bending moment MRqAnd the self-correction of the open caisson is realized.
7. The novel deviation rectifying method for the self-deviation rectifying open caisson according to claim 6, wherein the method comprises the following steps:
the open caisson productionAnti-tilting bending moment MRqBending moment M related to inclinationqDetermination of phase equilibrium, anti-tilting bending moment MRqBending moment M related to inclinationqAre substantially the same.
8. The novel deviation rectifying method for the self-deviation rectifying open caisson according to claim 7, wherein the method comprises the following steps:
the anti-inclination bending moment MRqThe following formula is calculated:
MRq＝∑(Gsixicosα+Gsihsisinα+Gwixicosα+Gwihwisinα) (1)
in the above formula:
MRq: sand is injected into the deviation correcting well hole (5) to increase the weight and increase or reduce the sum of the bending moment of the weight relative to the center of the open caisson base after pumping water and reducing the weight;
Gsi: the weight of the ith self-correcting well hole (5) is increased relative to the original self-correcting well hole (5) after sand is injected into the ith self-correcting well hole, namely the weight of the weighted self-correcting well hole (5) is the difference between the weight of the sand injected into the well hole and the weight of the discharged water;
Gwi: the weight of the ith row of self-correcting well holes (5) is reduced relative to the original self-correcting well holes (5) after water is pumped, namely the weight of the reduced self-correcting well holes (5) is the weight of pumped water;
xi: the distance from the center of the ith row of the deviation correcting well hole (5) to the Y axis of the open caisson;
hsi: after sand is injected into the ith row of self-deviation correcting well hole (5), the vertical distance between the gravity center of the sand and the center of the open caisson base is increased in the self-deviation correcting well hole (5);
hwi: the vertical distance between the gravity center of water pumped out of the self-correcting well hole (5) and the center of the open caisson base after water is pumped out of the ith row of self-correcting well hole (5);
α rotation angle of the open caisson base relative to Y/X axis, i.e. the ratio of the settlement difference of two sides of the open caisson to the length of the open caisson.
9. The novel deviation rectifying method for the self-deviation rectifying open caisson according to claim 8, wherein the method comprises the following steps:
α since the ratio of the settling difference between two sides of the sinking well to the length of the sinking well is small, α can be approximated to 0 in the estimation calculation, so the formula one can be simplified to the formula two:
MRq＝∑(Gsixi+Gwixi) (2)
after the deviation is corrected, the open caisson does not produce additional settlement any more, so the weight of the open caisson is basically kept unchanged, namely the weight of the poured sand and the pumped water are basically equal, and the formula three is met:
∑Gsi＝∑Gwi(3)
tilting moment MqBending moment for causing inclination of open caisson by resisting inclination bending moment MRqEqual to the tilting moment MqThe weight of sand injected into the self-correcting well hole (5) can be preliminarily determined; in the process of correcting deviation, the deviation-resisting bending moment MRq＝(1～1.5)MqTo obtain the deviation correction starting bending moment and monitor the open caisson attitude recovery process, when the open caisson attitude is corrected, the sand and stone in the self-deviation correction well hole (5) should be immediately discharged, so as to realize MRq＝MqAnd the later attitude stability of the open caisson is ensured.
10. The novel deviation rectifying method for the self-deviation rectifying open caisson according to claim 6, wherein the method comprises the following steps:
the sand injection drain holes (6) communicated with the self-deviation-correcting well hole (5) are at least two, when sand is injected into the self-deviation-correcting well hole (5) through one sand injection drain hole (6), water in the self-deviation-correcting well hole (5) is pumped out through the other sand injection drain hole (6), the sand injection speed is accelerated, and the two sand injection drain holes (6) are used for exchanging operation, so that the height difference of the sand surface in the self-deviation-correcting well hole (5) can be reduced.
Priority Applications (1)
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| CN114319408A (en) * | 2022-01-13 | 2022-04-12 | 中铁大桥局集团有限公司 | Construction method for correcting open caisson |
| CN115162395A (en) * | 2022-07-04 | 2022-10-11 | 中铁大桥勘测设计院集团有限公司 | Shell-core separation type composite open caisson foundation and construction method |
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