CN116220086A

CN116220086A - Large steel open caisson with water-gas combined type sinking control function and sinking construction method thereof

Info

Publication number: CN116220086A
Application number: CN202310356283.2A
Authority: CN
Inventors: 刘宁; 余秀平; 彭波; 李勇海; 杨嘉毅; 吴校全; 梁超; 韩永刚; 周新亚; 陈文尹; 岑峰; 吴军国; 施炎坤; 朱俊; 孙景龙; 杨涛
Original assignee: China Tiesiju Civil Engineering Group Co Ltd CTCE Group; Second Engineering Co Ltd of CTCE Group
Current assignee: China Tiesiju Civil Engineering Group Co Ltd CTCE Group; Second Engineering Co Ltd of CTCE Group
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-06-06

Abstract

The application discloses a large steel open caisson with water-gas combined type control sinking and a sinking construction method thereof. The outer well wall has an outer wall surface and an inner wall surface and extends in a first direction. The inner well wall is positioned on the inner side of the inner wall surface and extends along the first direction. The inner well wall comprises a first well wall, a second well wall and a third well wall. A portion of the inner wall surface, a portion of the two first walls of the well and a portion of the second wall of the well together form a first well bore. A part of the second well wall and the two third well walls form a second well bore together, and a plurality of second well bores are uniformly distributed along the circumferential direction. The top platform is fixed at a first end of the outer well wall, and the third end is spaced from the top platform by a predetermined distance. The boosting floating assisting mechanism comprises a floating assisting plate and an air compressor, wherein the floating assisting plate is positioned in the first shaft and is close to the top platform, the bottom end of the first shaft is communicated with seawater, and the top end of the first shaft is sealed through the floating assisting plate. The air compressor is communicated with the first shaft and is used for controlling air pressure in the first shaft.

Description

Large steel open caisson with water-gas combined type sinking control function and sinking construction method thereof

Technical Field

The specification relates to the technical field of deep water foundation construction of large-span bridges, in particular to a large-scale steel open caisson with water-gas combined type controlled sinking and a sinking construction method thereof.

Background

With the progress of science and technology, large-span bridges in the world develop rapidly, the number is continuously increased, and the span is continuously broken through. The open caisson foundation has the characteristics of high bearing capacity, high rigidity, good stability, strong shock resistance, no need of maintenance protection and reliable construction, and can be sunk on an ideal base layer with large depth or directly located on a foundation bed (a foundation is arranged) to obtain the required bearing capacity, so that the open caisson foundation is increasingly applied to the deep water foundation of a large-span bridge.

The steel open caisson top is usually designed, because the bearing platform is arranged at the top of the caisson, the outer well wall and the inner well wall of the open caisson usually have a certain height difference. When the steel open caisson is floated and carried in place, the open caisson is submerged until the sea surface is submerged over the top surface of the inner well wall, the bottom of the open caisson is not implanted, and the continuous submerged sinking can cause seawater to flow into the well wall from the top surface of the inner compartment well wall, so that uncontrollable sinking of the open caisson occurs.

In order to avoid uncontrollable sinking of the open caisson, a sealing plate is arranged on the top surface of the inner well wall of the open caisson, underwater cutting and dismantling are performed when bottom sealing concrete and concrete in the compartments are poured in the later period, or the inner compartment wall of the open caisson is heightened to be flush with the outer compartment wall of the open caisson, and underwater cutting and dismantling are performed when a bearing platform is constructed. In any method, a large number of temporary structures and underwater operations are involved, so that a plurality of adverse factors are brought to construction organizations on site, and the construction cost and the construction period are increased.

Disclosure of Invention

In view of the defects of the prior art, an object of the specification is to provide a large steel open caisson with water-gas combined type controlled sinking and a sinking construction method thereof, which can solve the problem that seawater flows into the well wall from the top surface of the well wall in the sinking process of the large steel open caisson to cause uncontrollable sinking of the open caisson under the conditions that a large number of temporary structures are not added and underwater operation does not occur.

In order to achieve the above object, embodiments of the present disclosure provide a large steel open caisson with water and gas combined type control of sinking, including:

an outer wall of a well having an outer wall surface and an inner wall surface extending in a first direction, the outer wall of a well having opposite first and second ends along the first direction;

an inner borehole wall extending in the first direction and located inside the inner wall surface, the inner borehole wall having opposite third and fourth ends in the first direction; the inner well wall comprises a first well wall, a second well wall and a third well wall, a plurality of first well walls are uniformly distributed along the circumferential direction, one radial end of each first well wall is connected with the inner wall surface, and the other radial end of each first well wall is connected with the second well wall; the central axis of the second well wall and the central axis of the outer well wall are collinear; one ends of the plurality of third well walls in the radial direction are connected with the second well wall, and the other ends of the plurality of third well walls intersect with the central axis of the outer well wall; a part of the inner wall surface, two first well walls and a part of the second well wall jointly form a first well shaft, and a plurality of first well shafts are uniformly distributed along the circumferential direction; a part of the second well wall and the two third well walls form a second well shaft together, a plurality of second well shafts are uniformly distributed along the circumferential direction, and the first well shaft is positioned outside the second well shaft;

the top platform is fixed at the first end of the outer well wall, the third end of the inner well wall is positioned at one side of the top platform close to the second end, and a preset distance is reserved between the third end and the top platform;

the boosting floating assisting mechanism comprises a floating assisting plate and an air compressor, wherein the floating assisting plate is positioned in the first shaft and is close to the top platform, one end of the first shaft, which is far away from the top platform, is communicated with seawater, and one end of the first shaft, which is close to the top platform, is sealed through the floating assisting plate; the two opposite ends of the second shaft along the first direction are communicated with seawater; the air compressor is arranged on the top platform and communicated with the first shaft and used for controlling air pressure in the first shaft.

As a preferable implementation mode, the outer well wall and the second well wall are of circular double-wall structures, and the inner wall surface and the outer wall surface of the outer well wall are stiffened by steel trusses and longitudinal and transverse annular plates; the inner well wall is of a double-wall structure, and the inside of the double wall of the inner well wall is stiffened by a steel truss and a longitudinal and transverse annular plate.

As a preferred embodiment, the predetermined pitch is 7m.

As a preferred embodiment, the number of the first wellbores is equal to the number of the first well walls, and the number of the second wellbores is equal to the number of the third well walls; the number of the first well walls is 16, and the number of the third well walls is 4.

As a preferred embodiment, a supporting upright post for supporting the top platform is arranged between the top platform and the inner well wall.

As a preferred embodiment, the top platform is provided with a base for installing the air compressor, and the base is fixed on the top platform by welding; the air compressor is provided with an air valve for controlling air inlet or air exhaust of the first shaft, and the air valve is communicated with the first shaft through a pipeline.

As a preferred embodiment, one air compressor controls the air pressure in two adjacent first shafts, and each air compressor is independently controlled; the pipelines of two adjacent first shafts sharing one air compressor adopt serial arrangement.

The embodiment of the specification also provides a sinking construction method of the large steel open caisson by controlling the sinking through the water-gas combination, which comprises the following steps:

step 1: floating the steel open caisson in place; the steel open caisson is a large steel open caisson with water-gas combined type controlled sinking according to any one of claims 1-7;

step 2: pouring water into the steel open caisson for sinking; in the water injection process, water is injected into the second shaft first and then into the first shaft;

step 3: when the steel open caisson continuously sinks to the sea level and is about to be over the top surface of the inner well wall, judging whether the second shaft is full of water or not; if not, stopping water injection, starting an air compressor, pressurizing and draining water in the first shaft, floating the steel open caisson, and repeating the step 2; if yes, enter step 4;

step 4: the steel open caisson is reduced in pressure and submerged, meanwhile, the verticality of the steel open caisson is monitored, and the verticality of the steel open caisson is adjusted through unbalanced air pressure control;

step 5: implantation of a steel open caisson;

wherein, step 1, step 2 and step 3 are water injection control stages, and step 4 and step 5 are air pressure control stages.

As a preferred embodiment, in the step 2, a water level difference between the first wellbore and the second wellbore is 14m.

In the step 5, the plane position of the steel open caisson is precisely positioned through an anchor cable system, a window period is selected, the steel open caisson is landed, and the sinking control of the steel open caisson is completed; the anchor cable system comprises a gravity anchor and a cable, and the gravity anchor is fixed with the steel open caisson through the cable; the cable can restrict the plane position of the steel open caisson and is used for correcting the plane position of the steel open caisson in the sinking process.

The beneficial effects are that:

the large steel open caisson with the water-gas combined type control sinking provided by the embodiment is provided with an outer well wall, an inner well wall, a top platform and a pressurizing and floating assisting mechanism, wherein an air compressor in the pressurizing and floating assisting mechanism can control air pressure in a first shaft and adjust the height of a water line in the first shaft, so that the draft of the steel open caisson can be adjusted. When the steel open caisson continuously sinks to the sea level and is about to be over the top surface of the inner well wall, the second well shaft is not filled with water, water injection to the steel open caisson is stopped, an air compressor is started, pressurizing and draining are carried out in the first well shaft, the steel open caisson floats upwards, so that seawater cannot flow into the well wall from the top surface of the well wall, and then water injection to the steel open caisson is continued; and after the second shaft is filled with water, starting an air compressor to enable the steel open caisson to sink under reduced pressure, and finally enabling the steel open caisson to be implanted. The large-scale steel open caisson with the water-gas combined type controlled sinking can solve the problem that seawater flows into the well wall from the top surface of the well wall in the sinking process of the large-scale steel open caisson under the conditions that a large number of temporary structures are not added and underwater operation does not occur, so that the open caisson cannot be controlled to sink.

Specific embodiments of the invention are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope thereby.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a step flow chart of a sinking construction method of a large steel open caisson with water-gas combined type controlled sinking provided in the present embodiment;

fig. 2 is a top view of a large-scale steel open caisson with water and gas combined type sinking control provided in this embodiment;

FIG. 3 is a cross-sectional view of a large-scale steel open caisson with combined water and gas control for sinking according to the present embodiment;

fig. 4 to 10 are views showing sinking process of the large steel open caisson with water and gas combined type controlled sinking according to the present embodiment.

Reference numerals illustrate:

100. a steel open caisson; 1. an outer well wall; 11. an outer wall surface; 12. an inner wall surface; 13. a first end; 14. a second end; 2. an inner well wall; 21. a third end; 22. a fourth end; 23. a first borehole wall; 24. a second borehole wall; 25. a third borehole wall; 3. a floating assisting plate; 4. a top platform; 5. a support column; 6. a first wellbore; 7. a second wellbore; 8. a base; 9. an air compressor; 10. an air valve; 15. a pipe; 16. sea level; 17. a sea bed surface; 18. a base groove; 19. a gravitational anchor; 20. a cable; x, first direction.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Please refer to fig. 2 and 3. The embodiment of the application provides a large steel open caisson 100 with water-gas combined type control sinking, which comprises an outer well wall 1, an inner well wall 2, a top platform 4 and a boosting floating assisting mechanism.

The outer wall 1 has an outer wall 11 and an inner wall 12, and extends in a first direction X. The outer borehole wall 1 has opposite first and second ends 13, 14 along the first direction X. As shown in fig. 3, the first direction X is preferably a vertical direction, the first end 13 is a top end of the outer wall 1, and the second end 14 is a bottom end of the outer wall 1.

The inner well wall 2 is located inside the inner wall surface 12 and extends in the first direction X. The inner borehole wall 2 has opposite third 21 and fourth 22 ends along the first direction X. The third end 21 is the top end of the inner well wall 2, and the fourth end 22 is the bottom end of the inner well wall 2. The inner well wall 2 comprises a first well wall 23, a second well wall 24 and a third well wall 25. A plurality of the first well walls 23 are uniformly distributed in the circumferential direction. The first well wall 23 is connected to the inner wall 12 at one end in the radial direction, and is connected to the second well wall 24 at the other end. The central axis of the second borehole wall 24 is collinear with the central axis of the outer borehole wall 1. One ends of the third well walls 25 in the radial direction are connected to the second well wall 24, and the other ends thereof intersect with the central axis of the outer well wall 1. A portion of the inner wall 12, two of the first walls 23 and a portion of the second wall 24 together form a first wellbore 6. A plurality of said first wellbores 6 are evenly distributed in the circumferential direction. A portion of the second borehole wall 24 and the two third borehole walls 25 together form the second borehole 7. A plurality of said second wellbores 7 are evenly distributed in the circumferential direction. The first wellbore 6 is located outside the second wellbore 7. The size of the single first shaft 6 is smaller than that of the single second shaft 7, so that the air pressure in the first shaft 6 can be regulated and controlled at a later stage.

The top platform 4 is fixed to a first end 13 (top end) of the outer wall 1 for storing necessary construction equipment and for personnel activities. The third end 21 of the inner well wall 2 is located at a side of the top platform 4 close to the second end 14, and the third end 21 is spaced from the top platform 4 by a predetermined distance, that is, the third end 21 is lower than the first end 13. In addition, the fourth end 22 of the first borehole wall 23 and the second borehole wall 24 may be flush with the second end 14, and the fourth end 22 of the third borehole wall 25 may be higher than the second end 14. I.e. in the first direction X, neither end of the inner borehole wall 2 exceeds both ends of the outer borehole wall 1.

The boosting floating assisting mechanism comprises a floating assisting plate 3 and an air compressor 9. The floating assist plate 3 is positioned within the first wellbore 6 and is positioned adjacent to the top deck 4. Preferably, the floating assisting plate 3 is located at the top of the first shaft 6 and is mainly used for the undocking floating assisting of the steel open caisson 100, floating assisting in the floating process and sinking process control. The end (bottom end) of the first shaft 6, which is far away from the top platform 4, is communicated with seawater, and the end (top end) of the first shaft 6, which is near to the top platform 4, is sealed by the floating assisting plate 3. The two opposite ends of the second shaft 7 along the first direction X are all communicated with the sea water, that is, the top end and the bottom end of the second shaft 7 are both open, and the internal water level line is the same as the sea level 16. The air compressor 9 is disposed on the top platform 4 and is communicated with the first shaft 6, and is used for controlling air pressure in the first shaft 6, so as to meet the requirement of adjusting the draft of the steel open caisson 100.

The water line inside the first wellbore 6 is the same as the sea level 16 without pressurized venting. In the process of exiting the dock gate and floating of the steel open caisson 100, the air compressor 9 can be utilized to carry out pressurization and drainage according to the requirements of the draft, so that the water level line in the first shaft 6 and the external sea level 16 generate a height difference, and the requirements of adjusting the draft of the steel open caisson 100 are met. In the second stage (i.e., the air pressure control stage described below) of positioning sinking of the steel open caisson 100, implantation of the steel open caisson 100 and correction of verticality are achieved by controlling the air pressure in the first wellbore 6.

The large steel open caisson 100 with the water-gas combined type control sinking provided by the embodiment is provided with an outer well wall 1, an inner well wall 2, a top platform 4 and a pressurizing floating assisting mechanism, wherein an air compressor 9 in the pressurizing floating assisting mechanism can control air pressure in a first shaft 6, and the height of a water line in the first shaft 6 is adjusted, so that the draft of the steel open caisson 100 can be adjusted. When the steel open caisson 100 continuously sinks to the sea level 16 and is about to overflow the top surface of the inner well wall 2, the second well shaft 7 is not filled with water, the water injection to the steel open caisson 100 is stopped, the air compressor 9 is started, the first well shaft 6 is pressurized and drained, the steel open caisson 100 floats upwards, so that seawater cannot flow into the well wall from the top surface of the well wall, and then the water injection to the steel open caisson 100 is continued; after the second shaft 7 is filled with water, the air compressor 9 is started to enable the steel open caisson 100 to sink under reduced pressure, and finally the steel open caisson 100 is implanted. The large steel open caisson 100 with the water-gas combined type controlled sinking can solve the problem that seawater flows into the well wall from the top surface of the well wall in the sinking process of the large steel open caisson 100 to cause uncontrollable sinking of the open caisson under the conditions that a large number of temporary structures are not added and underwater operation does not occur.

In this embodiment, the outer wall 1 and the second wall 24 are both in a circular double wall structure. The inner wall surface 12 and the outer wall surface 11 of the outer well wall 1 are reinforced by steel trusses and longitudinal and transverse annular plates. The inner well wall 2 is of a double-wall structure, and the inside of the double wall of the inner well wall 2 is reinforced by steel trusses and longitudinal and transverse annular plates. The predetermined distance between the third end 21 of the inner borehole wall 2 and the top platform 4 is 7m.

In this embodiment, the number of the first wellbores 6 is equal to the number of the first well walls 23, and the number of the second wellbores 7 is equal to the number of the third well walls 25. The number of the first well walls 23 may be 16, and the number of the third well walls 25 may be 4.

Specifically, a supporting column 5 is arranged between the top platform 4 and the inner well wall 2, and is used for supporting the top platform 4.

As shown in fig. 2 and 3, the top platform 4 is provided with a base 8 for installing the air compressor 9, the base 8 is fixed on the top platform 4 by welding, and the base 8 can provide support for the air compressor 9. The air compressor 9 may be secured to the base 8 by a fastener connection. The air compressor 9 is provided with a matched air valve 10 for controlling the air inlet or the air outlet of the first shaft 6, thereby controlling the air pressure in the first shaft 6. The gas valve 10 and the first wellbore 6 are in communication via a conduit 15. The gas in the pipeline 15 passes through, one end of the pipeline 15 is connected with the gas valve 10, and the other end is connected with the first shaft 6.

In this embodiment, the air compressors 9 are configured in a one-to-two manner, that is, one air compressor 9 controls the air pressure in two adjacent first shafts 6, each air compressor 9 is independently controlled, and the purpose of vertical deviation correction can be achieved through the control of unbalanced air pressure in the second stage (that is, the air pressure control stage described below) of positioning and sinking the steel open caisson 100. As shown in fig. 2, the pipes 15 of two adjacent first shafts 6 sharing one air compressor 9 are arranged in series.

As shown in fig. 1, the embodiment of the application further provides a sinking construction method of the large steel open caisson 100 with water-gas combined type controlled sinking, which comprises the following steps:

step 1: steel caisson 100 is floating in place. Wherein, the steel open caisson 100 is a large steel open caisson with water and gas combined type controlled sinking as described in any one of the above embodiments. Specifically, after the steel open caisson 100 is undocked, the steel open caisson 100 is roughly positioned by a positioning device through towing, floating and positioning and cable passing, as shown in fig. 4.

Step 2: steel open caisson 100 is submerged by injection water. In the water injection process, the second shaft 7 is injected first, and in order to meet the requirement of the difference between the internal and external water heads of the steel open caisson 100 (the water level difference between the first shaft 6 and the second shaft 7 is about 14 m), the first shaft 6 is injected, so that the structural safety is ensured, as shown in fig. 5.

Step 3: when the steel open caisson 100 continues to sink to the sea level 16, i.e. just before the top surface of the inner well wall 2, it is determined whether the second well bore 7 is filled with water. If not, in order to prevent the seawater from being poured into the inner well wall 2, the steel open caisson 100 is caused to perform uncontrollable sudden sinking, water injection is stopped, the air compressor 9 is started, the first well bore 6 is pressurized and drained to enable the steel open caisson 100 to float upwards as shown in fig. 6, and the step 2 is repeated (namely, after the steel open caisson 100 floats upwards, water injection is performed again on the second well bore 7 to enable the steel open caisson 100 to sink until the second well bore 7 is filled with water as shown in fig. 7). If yes, go to step 4.

Step 4: the steel open caisson 100 is submerged under reduced pressure, and meanwhile, the verticality of the steel open caisson 100 is monitored, and the verticality of the steel open caisson 100 is adjusted through unbalanced air pressure control. As shown in fig. 8, steel open caisson 100 is inclined under wave flow force, and at this time, verticality of steel open caisson 100 is adjusted by unbalanced pressurization, as shown in fig. 9. The unbalanced air pressure control or the unbalanced pressurizing method is realized through independent control of each air compressor 9, namely, different air compressors 9 can adjust the air pressure of the first shaft 6 at different positions to different values, so that the inclined steel open caisson 100 can be adjusted to the vertical position.

Step 5: steel open caisson 100 is then set. Specifically, as shown in fig. 10, the plane position of the steel open caisson 100 is precisely positioned by an anchor cable system, and a proper window period is selected to enable the steel open caisson 100 to be implanted, so that the sinking control of the steel open caisson 100 is completed. The mooring line system comprises a gravity anchor 19 and a mooring line 20, and can be used as a positioning device for the steel open caisson 100. The gravity anchor 19 is fixed with the steel open caisson 100 through the cable 20 to provide an anchoring force for the positioning device of the steel open caisson 100. The cable 20 can restrict the plane position of the steel open caisson 100, and is used for correcting the plane position of the steel open caisson 100 in the sinking process.

Wherein, step 1, step 2 and step 3 are water injection control stages (first stage), and step 4 and step 5 are air pressure control stages (second stage). The two stages take the water filling in the second shaft 7 as a sign to finish the system conversion, and the water filling control stage is converted into the air pressure control stage.

The water injection control stage is to perform water injection and sinking on the second shaft 7 preferentially when the steel open caisson 100 is submerged in the initial water injection and sinking stage, and the water injection condition of the first shaft 6 is based on the water head difference (about 14 m) between the inner wall and the outer wall. When the steel open caisson 100 is submerged to the sea surface and is about to submerge the top surface of the inner well wall 2, the air compressor 9 is started, so that the steel open caisson 100 floats upwards; after the set position is reached, the steel open caisson 100 is continuously submerged by pouring water until the second shaft 7 is filled with water, system conversion is completed, and the air pressure control stage is entered.

The steel open caisson 100 is reduced in pressure to be placed on a deposition bed through the air compressor 9, meanwhile, the sinking posture of the steel open caisson 100 is monitored, and the perpendicularity of the steel open caisson 100 is corrected through the measure of unbalanced air pressure. Meanwhile, the plane position of the steel open caisson 100 is precisely positioned through an anchor cable system, and a proper window period is selected to enable the open caisson to be landed, so that the sinking control of the steel open caisson 100 is completed.

In this embodiment, the construction method can solve the technical problem solved by the large steel open caisson 100 with water-gas combined control sinking, and accordingly achieve the technical effect of the large steel open caisson 100 with water-gas combined control sinking, which is not described in detail herein.

In this embodiment, the sea level 16 is the sea level, and the high level tide sea level 16 is defaulted to an unfavorable condition. The steel open caisson 100 is lowered so that the second end 14 of the outer well wall 1 and the fourth end 22 of the inner well wall 2 are placed in the foundation trench 18 of the seabed 17. The seabed surface 17, i.e. the seabed bed, is in this embodiment bare rock, although a bed with a cover layer is also applicable. The base tank 18 is a site of the steel open caisson 100 on the seabed, and is processed into an annular base tank by the procedures of seabed blasting, slag removal and the like in advance.

It should be noted that, in the description of the present specification, the terms "first," "second," and the like are used for descriptive purposes only and to distinguish between similar objects, and there is no order of preference therebetween, nor should it be construed as indicating or implying relative importance. In addition, in the description of the present specification, unless otherwise indicated, the meaning of "a plurality" is two or more.

Any numerical value recited herein includes all values of the lower and upper values that are incremented by one unit from the lower value to the upper value, as long as there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of components or the value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, then the purpose is to explicitly list such values as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. in this specification as well. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be explicitly recited in this description, and all possible combinations of values recited between the lowest value and the highest value are believed to be explicitly stated in the description in a similar manner.

Unless otherwise indicated, all ranges include endpoints and all numbers between endpoints. "about" or "approximately" as used with a range is applicable to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the indicated endpoints.

All articles and references, including patent applications and publications, disclosed herein are incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprises" or "comprising" to describe combinations of elements, components, or steps herein also contemplates embodiments consisting essentially of such elements, components, or steps. By using the term "may" herein, it is intended that any attribute described as "may" be included is optional.

Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the inventors regard such subject matter as not be considered to be part of the disclosed subject matter.

Claims

1. The utility model provides a large-scale steel open caisson that aqueous vapor combination formula control was sunk which characterized in that includes:

2. The large-scale steel open caisson with water and gas combined type sinking control according to claim 1, wherein the outer well wall and the second well wall are of circular double-wall structures, and steel truss stiffening and longitudinal and transverse annular plate stiffening are arranged between the inner wall surface and the outer wall surface of the outer well wall; the inner well wall is of a double-wall structure, and the inside of the double wall of the inner well wall is stiffened by a steel truss and a longitudinal and transverse annular plate.

3. The large-scale steel open caisson with combined water and gas control sinking according to claim 1, wherein the predetermined distance is 7m.

4. The large-scale steel open caisson with combined water and gas control sinking according to claim 1, wherein the number of the first shafts is equal to the number of the first well walls, and the number of the second shafts is equal to the number of the third well walls; the number of the first well walls is 16, and the number of the third well walls is 4.

5. The large-scale steel open caisson with water and gas combined type sinking control according to claim 1, wherein a supporting upright post for supporting the top platform is arranged between the top platform and the inner well wall.

6. The large-scale steel open caisson with water-air combined type sinking control according to claim 1, wherein a base for installing the air compressor is arranged on the top platform, and the base is fixed on the top platform by welding; the air compressor is provided with an air valve for controlling air inlet or air exhaust of the first shaft, and the air valve is communicated with the first shaft through a pipeline.

7. The large-scale steel open caisson with combined water and gas control sinking according to claim 6, wherein one air compressor controls the air pressure in two adjacent first shafts, and each air compressor is independently controlled; the pipelines of two adjacent first shafts sharing one air compressor adopt serial arrangement.

8. A sinking construction method of a large steel open caisson with water-gas combined type controlled sinking is characterized by comprising the following steps:

step 5: implantation of a steel open caisson;

9. The sinking construction method of a large steel open caisson by water and gas combined type control sinking according to claim 8, wherein in the step 2, the water level difference between the first well bore and the second well bore is 14m.

10. The sinking construction method of the large steel open caisson controlled by water-gas combination according to claim 8, wherein in the step 5, the plane position of the steel open caisson is precisely positioned through an anchor cable system, a window period is selected, the steel open caisson is made to be planted, and the sinking control of the steel open caisson is completed; the anchor cable system comprises a gravity anchor and a cable, and the gravity anchor is fixed with the steel open caisson through the cable; the cable can restrict the plane position of the steel open caisson and is used for correcting the plane position of the steel open caisson in the sinking process.