CN113235515A - Subdivision bulkhead designed backfill suction type steel cylinder island wall structure and installation method - Google Patents
Subdivision bulkhead designed backfill suction type steel cylinder island wall structure and installation method Download PDFInfo
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- CN113235515A CN113235515A CN202110479757.3A CN202110479757A CN113235515A CN 113235515 A CN113235515 A CN 113235515A CN 202110479757 A CN202110479757 A CN 202110479757A CN 113235515 A CN113235515 A CN 113235515A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 125
- 239000010959 steel Substances 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009434 installation Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000004576 sand Substances 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims description 18
- 239000002689 soil Substances 0.000 claims description 14
- 238000005192 partition Methods 0.000 claims description 6
- 238000007667 floating Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000004575 stone Substances 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
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- 239000010802 sludge Substances 0.000 description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 240000005374 Rumex hydrolapathum Species 0.000 description 1
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- 238000005452 bending Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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- E02D17/18—Making embankments, e.g. dikes, dams
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Abstract
A backfill suction type steel cylinder island wall structure designed for a compartment separation cabin and an installation method are provided, wherein an arc-shaped revetment structure is formed by connecting a plurality of steel cylinder devices end to end. The lower structure of the steel cylinder device is inserted into a seabed impervious layer or a permeable layer, each steel cylinder device comprises a steel cylinder, openings welded on the left side and the right side of the steel cylinder through connecting rib plates face the outer side respectively, the cross section of each opening is arc-shaped, the size of each opening is three-quarter circular, a first arc-shaped side wing and a second arc-shaped side wing are circular, the diameter of each second arc-shaped side wing is larger than that of each first arc-shaped side wing, and the first arc-shaped side wing, the second arc-shaped side wings, the top surface of each steel cylinder and the bottom surface of each steel cylinder are arranged in parallel and level along the vertical direction. According to the invention, if the steel cylinder device is inclined under the combined action of the pile load and the wave load in the island after the arc-shaped revetment structure is installed, water injection or sand backfilling can be carried out on the high cabin or the middle cabin of the high cabin; or the low cabin and the middle cabin are pumped or sand and stone are removed to realize deviation correction.
Description
Technical Field
The invention relates to a steel cylinder bank protection structure. In particular to a backfill suction type steel cylinder island wall structure designed for a compartment separation cabin and an installation method.
Background
In recent years, due to the increase in the development and utilization of the ocean by mankind, engineering projects such as oil and gas exploitation platforms, offshore airports, deep-water ports, artificial islands, and the like, need to be constructed on the ocean. Compared with the land, the offshore engineering faces a lot of problems of heavy wind, heavy waves, super-thick soft foundation, short construction operation window period and the like, how to quickly and efficiently complete the island wall structure, and the construction of dry land operation environment is an important part in the offshore engineering construction.
At present, a quick island forming technology, namely a vibration sinking type super-large diameter steel cylinder, is combined with an arc rib plate to be used as an auxiliary cabin to be connected to form a water-stop island wall structure, and finally, sandy soil is backfilled to form a land. For example, the artificial island engineering of the Ganzaoda bridge adopts steel cylinders with the height of 40.5-50.5 m and the diameter of 22m to construct the island wall, 8 hydraulic vibration hammers are arranged for vibration sinking, and the two large cylinders are connected by using arc steel plates as auxiliary cabins. However, the vibration sinking technology generally needs to configure a hammer set system with a plurality of specific types of vibration hammers to be linked according to the diameter and the weight of the steel cylinder, so that the manufacturing cost is high, the hammer set is heavy, and the sinking time is long. In addition, from the perspective of the ocean foundation, the large-diameter cylinder can generate larger disturbance to the surrounding soil body in the process of vibro-precipitation, the strength of the ocean clay with higher sensitivity can be rapidly reduced and is difficult to recover again in a short period, and the island wall structure mainly depends on the resistance of the surrounding foundation to maintain stability; after the sand soil is backfilled, the contact surface of the bottom of the sand soil and the seabed soft sludge is discharged, so that the sludge squeezing phenomenon can occur, and the stability of the steel cylinder is influenced; the adjacent large cylinders are connected by the arc-shaped rib plates, so that the water stopping effect can be achieved, but the integrity of the island wall structure is poor.
In addition, the inclination control requirement is high when the large cylinder is installed, the deviation rectification and leveling of the large cylinder can be indirectly realized only by adjusting the vibration of the vibration hammers in different directions in the conventional vibration sinking method, the method belongs to passive deviation rectification or indirect deviation rectification, and the designed verticality is difficult to achieve when a hard stratum is met.
Moreover, after the large cylinder is installed, under the combined action of stacking and wave in the island, the phenomenon of inclination can occur, and the existing correction measures for the situation are few and difficult to realize.
Therefore, new forms of revetment structures are sought which ensure not only rapid installation of the revetment structure but also its overall stability.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cabin bulkhead design backfillable suction type steel cylinder island wall structure and an installation method, wherein the cabin bulkhead design backfillable suction type steel cylinder island wall structure can be installed quickly, is convenient and time-saving in construction, can actively realize quick deviation correction and has higher overall stability.
The technical scheme adopted by the invention is as follows: a suction type steel cylinder island wall structure capable of being backfilled is designed for a compartment, and is an arc-shaped revetment structure formed by connecting a plurality of steel cylinder devices end to end, inserting the lower parts of the steel cylinder devices into a seabed impervious layer or a weakly permeable layer, wherein each steel cylinder device comprises a steel cylinder, a first arc-shaped side wing and a second arc-shaped side wing, the first arc-shaped side wing and the second arc-shaped side wing are connected to two sides of the steel cylinder respectively through connecting rib plates, the upper end face and the lower end face of the first arc-shaped side wing and the upper end face of the second arc-shaped side wing are correspondingly arranged in a flush manner, the opening is far away from the steel cylinder, the diameter of the second arc-shaped side wing is larger than that of the first arc-shaped side wing, so that a sand stone cylinder for backfilling can be formed by embedding the first arc-shaped side wing of the latter steel cylinder device into the second arc-shaped side wing of the former steel cylinder device together, and the steel cylinder is divided into a lower compartment and an upper compartment through a horizontally arranged compartment plate, the lower compartment is internally and coaxially provided with a lower inner sleeve, the lower inner sleeve is equal in height to the lower compartment, N lower sub-compartments with equal size are formed between the inner wall of the lower compartment and the outer wall of the lower inner sleeve at equal intervals through N lower clapboards which are vertically arranged, the upper inner sleeve is coaxially arranged in the upper compartment, the upper inner sleeve is equal in height to the upper compartment, N upper sub-compartments with equal size are formed between the inner wall of the upper compartment and the outer wall of the upper inner sleeve at equal intervals through N upper clapboards which are vertically arranged, each upper sub-compartment corresponds to one lower sub-compartment, a water pumping/air hole is formed on the partition board corresponding to each lower sub-compartment and each lower inner sleeve, and a water pumping hose which is communicated with the corresponding lower sub-compartment or the corresponding lower inner sleeve and is used for pumping air from the lower sub-compartment or the lower inner sleeve, the other end of each hose inserted into the lower compartment penetrates through the corresponding upper compartment and is correspondingly connected with a vacuum barrel arranged outside the steel cylinder device, and each vacuum barrel is connected with a vacuum pump.
An installation method of a backfill suction type steel cylinder island wall structure designed for a compartment separation cabin is characterized by comprising the following steps:
1) the method comprises the following steps of (1) transporting steel cylinder devices which are prefabricated in a factory and have required number and set size to a specified place in a self-floating towing mode at sea, and preparing for penetration after hoisting by using professional hoisting equipment;
2) beginning to sink, utilizing a positioning system to enable the steel cylinder device to be in place at a designated position, firstly injecting a certain amount of water into each upper sub-chamber of an upper compartment of the steel cylinder device, and enabling the steel cylinder device to sink under the self-weight under the action of the water and the self-weight until each lower sub-chamber of a lower compartment forms a closed condition;
3) after the self-weight sinking is finished, one end of each hose for pumping water or air is respectively connected to the water pumping/air hole on the bulkhead plate and communicated with the corresponding lower sub-chamber, the other end of each hose is connected with the vacuum barrel, the vacuum barrel is connected with the vacuum pump, the vacuum pump is started to pump water and air in each lower sub-chamber, and the steel cylinder device sinks to a set depth under the action of negative pressure;
4) after the sinking is finished, filling sandy soil or water into each upper sub-chamber of the upper compartment according to the set requirement;
5) continuously sinking the next steel cylinder device, and embedding the first arc-shaped side wing of the next steel cylinder device into the second arc-shaped side wing of the previous steel cylinder device after sinking, so as to form a cylinder for backfilling gravel together;
6) backfilling sandy soil in the formed cylindrical cylinder for backfilling the sandstone according to the design requirement;
7) repeating the steps 2) to 6) until all the steel cylinder devices are completely sunk, and forming an artificial island or a deep water wharf;
8) after sinking, the steel cylinder device is inclined under the combined action of the pile load in the island and the wave force outside the island, and the leveling is realized by backfilling water or gravel to the upper sub-chamber on the high side or pumping water or gravel to the upper sub-chamber on the low side;
9) backfilling the inner side of the artificial island or the deepwater wharf and reinforcing the foundation.
The invention relates to a cabin separation chamber design backfill suction type steel cylinder island wall structure and an installation method, wherein negative pressure sinking is adopted, the arc-shaped side wings at two sides can improve the structural integrity, the upper and lower separation chambers realize quick deviation correction through the cabin separation, and the invention has the characteristics of quick installation, convenient and time-saving construction, quick deviation correction and higher overall stability. The invention has the following advantages:
1. this structure is through applying the negative pressure to lower part lobe and sinking, avoids using the hammer that shakes, and required equipment is few, and the time spent is short, can reduce cost, effectively improves site operation efficiency.
2. The bottom of the structure directly acts on the surface of the soft soil foundation, so that the uplift and the flow of foundation soil are prevented, and the bearing capacity of the structure is improved.
3. The water (gas) pumping hose and the air suction valve arranged at the center of the top surface of the lower cabin are connected with the lower cabin body, the external vacuum tank can control the negative pressure of each water (gas) pumping hose, the air suction valve can be opened and closed according to requirements, the negative pressure of each cabin body is effectively controlled, and the sinking and the rectification are facilitated.
4. The size of the central cabin and the number of the side cabins of the large cylindrical cabin body can be flexibly set according to the engineering requirement.
5. The lateral support of each steel cylinder is enhanced by the large and small arc-shaped side wings, and the overall stability is obviously improved.
6. This structure carries out the subdivision respectively at upper and lower cabin body, can realize sinking the quick deviation rectification of in-process, compares in traditional hammer that shakes moreover and rectifies a deviation, can not produce the disturbance to peripheral soil body, and stability is good.
7. This structure carries out the subdivision to the upper portion cabin body, can not only realize rectifying fast sinking the in-process, and the accessible is adjusted the water or the grit volume in each cabin body in upper portion and is realized rectifying fast moreover after the structural mounting is accomplished.
8. The structure can utilize upper and lower bays to carry out marine buoy towing.
Drawings
FIG. 1 is a schematic view showing the overall structure of a steel cylinder apparatus according to the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a bottom view of FIG. 1;
FIG. 4 is a schematic structural view of a first embodiment of a combination of two steel cylinder devices;
FIG. 5 is a schematic structural view of a second embodiment of a combination of two steel cylinder devices;
FIG. 6 is a schematic view of a steel cylinder installation sinking process;
FIG. 7 is a schematic diagram of the process of correcting and leveling the steel cylinder device;
FIG. 8 is a schematic view of a deviation rectifying and leveling measure of the steel cylinder device;
FIG. 9 is a schematic illustration of a commissioning procedure after installation is complete;
fig. 10 is a schematic view of a formed artificial island or deep water dock.
In the drawings
1: a steel cylinder 2: connecting rib plate
3: first arc-shaped side wing 4: second arc flank
5: the compartment plate 6: lower compartment
7: upper compartment 8: cylinder
9: lower inner sleeve 10: lower baffle plate
11: lower sub-compartment 12: upper inner sleeve
13: upper partition plate 14: upper sub-cabin
15: water/air pumping hole 16: flexible pipe
17: the vacuum drum 18: vacuum pump
19: the air release valve 20: water drain valve
21: backfilling sandy soil 22: sea level
23: sea floor surface 24: impervious layer
25: artificial island or deep water wharf
Detailed Description
The present invention provides a backfill suction type steel cylinder island wall structure and an installation method for a subdivision bay design, which are described in detail with reference to the following embodiments and accompanying drawings.
As shown in fig. 1, the subdivision bulkhead of the invention is designed with a backfill suction type steel cylinder island wall structure, which is an arc-shaped revetment structure formed by connecting a plurality of steel cylinder devices end to end, and inserting the lower parts of the steel cylinder devices into a seabed impervious layer or a weakly permeable layer, wherein each steel cylinder device comprises a steel cylinder 1, a first arc-shaped side wing 3 and a second arc-shaped side wing 4 which are respectively connected with the two sides of the steel cylinder 1 through connecting rib plates 2, the upper and lower end surfaces of the first arc-shaped side wing 3 and the second arc-shaped side wing 4 are correspondingly arranged in parallel with the upper and lower end surfaces of the steel cylinder 1, the opening is far away from the steel cylinder 1, and the connecting line included angle between the circle centers of the first arc-shaped side wing 3 and the second arc-shaped side wing 4 and the circle. The diameter of the second arc-shaped flank 4 is larger than that of the first arc-shaped flank 3, so that a cylinder 8 for backfilling gravel can be formed by embedding the first arc-shaped flank 3 of the latter steel cylinder device into the second arc-shaped flank 4 of the former steel cylinder device, as shown in fig. 4 and 5, wherein fig. 4 is a connection diagram on a first straight line, in which the connection included angles between the centers of the first arc-shaped flank 3 and the second arc-shaped flank 4 and the center of the steel cylinder 1 are respectively equal to 180 degrees. Fig. 5 shows that when two steel cylinder devices are connected, the connection angle between the center of the first arc-shaped side wing 3 and the center of the second arc-shaped side wing 4 in the right steel cylinder device and the center of the steel cylinder 1 is equal to 180 degrees, i.e. on a first straight line, and the connection angle between the center of the first arc-shaped side wing 3 and the center of the second arc-shaped side wing 4 in the left steel cylinder device and the center of the steel cylinder 1 is less than 180 degrees, so that a certain bending is formed during connection.
As shown in fig. 1, 2 and 3, the steel cylinder 1 is divided into a lower compartment 6 and an upper compartment 7 by a horizontally arranged bulkhead 5, and the bulkhead 5 is welded to the inner wall of the steel cylinder 1. A lower inner sleeve 9 is coaxially arranged in the lower compartment 6, the lower inner sleeve 9 is equal to the lower compartment 6 in height, N lower sub-compartments 11 with the same size are formed between the inner wall of the lower compartment 6 and the outer wall of the lower inner sleeve 9 at equal intervals through N lower partition plates 10 which are vertically arranged, an upper inner sleeve 12 is coaxially arranged in the upper compartment 7, the upper inner sleeve 12 is equal to the upper compartment 7 in height, N upper sub-compartments 14 with the same size are formed between the inner wall of the upper compartment 7 and the outer wall of the upper inner sleeve 12 at equal intervals through N upper partition plates 13 which are vertically arranged, and each upper sub-compartment 14 corresponds to one lower sub-compartment 11. And N is 4-12.
As shown in fig. 1, a water/air suction hole 15 is formed on the partition board 5 corresponding to each lower sub-compartment 11 and the lower inner sleeve 9, a hose 16 communicated with the corresponding lower sub-compartment 11 or the corresponding lower inner sleeve 9 and used for sucking water or air from the lower sub-compartment 11 or the lower inner sleeve 9 is connected to each water/air suction hole 15, the other end of each hose 16 inserted into the lower sub-compartment 11 penetrates through the corresponding upper sub-compartment 14 and is correspondingly connected with a vacuum bucket 17 arranged outside the steel cylinder device, and each vacuum bucket 17 is connected with a vacuum pump 18. An air release valve 19 for discharging air drawn out from the lower sub-chamber 11 is provided at an upper portion of the vacuum bucket 17, and a drain valve 20 for discharging water drawn out from the lower sub-chamber 11 is provided at a lower portion of the vacuum bucket 17.
The invention discloses an installation method of a subdivision bay design backfilling suction type steel cylinder island wall structure, which comprises the following steps:
1) the steel cylinder devices which are prefabricated in a factory and have the required number and set sizes and are shown in the figure 1 are transported to a specified place in an offshore self-floating towing mode, and are lifted by professional lifting equipment to be ready for penetration; as in step a of fig. 6.
2) Beginning to sink, utilizing a positioning system to enable the steel cylinder device to be in place at a designated position, firstly injecting a certain amount of water into each upper sub-chamber of an upper compartment of the steel cylinder device, and enabling the steel cylinder device to sink under the self-weight under the action of the water and the self-weight until each lower sub-chamber of a lower compartment forms a closed condition; step b in fig. 6 is added with water to sink by gravity.
3) After the self-weight sinking is finished, one end of each hose for pumping water or air is respectively connected to the water pumping/air hole on the bulkhead plate and communicated with the corresponding lower sub-chamber, the other end of each hose is connected with the vacuum barrel, the vacuum barrel is connected with the vacuum pump, the vacuum pump is started to pump water and air in each lower sub-chamber, and the steel cylinder device sinks to a set depth under the action of negative pressure; suction sinking as in step c of fig. 6.
4) After the sinking is finished, filling sandy soil or water into each upper sub-chamber of the upper compartment according to the set requirement; step d in fig. 6 is to fill back the sand or water.
5) Continuously sinking the next steel cylinder device, and embedding the first arc-shaped side wing of the next steel cylinder device into the second arc-shaped side wing of the previous steel cylinder device after sinking, so as to form a cylinder for backfilling gravel together; the second steel cylinder device is lowered as in step e of fig. 6.
6) Backfilling sandy soil in the formed cylindrical cylinder for backfilling the sandstone according to the design requirement; sand or water is backfilled as in step f of fig. 6.
7) Repeating the steps 2) to 6) until all the steel cylinder devices are completely sunk, and forming an artificial island or a deep water wharf; as shown in fig. 10. The steel cylinder device at the corner position where the artificial island or the deepwater wharf is formed adopts a steel cylinder device, wherein the included angle between the circle centers of a first arc-shaped side wing 3 and a second arc-shaped side wing 4 which are connected to the two sides of a steel cylinder 1 and the connecting line of the circle centers of the steel cylinder 1 is a set angle smaller than 180 degrees. As shown in fig. 5.
8) After the steel cylinder device is sunk, the steel cylinder device is inclined under the combined action of the pile load in the island and the wave force outside the island, and the leveling is realized by backfilling water or gravel to the upper sub-chamber on the high side or pumping water or gravel to the upper sub-chamber on the low side, as shown in fig. 9;
9) backfilling the inner side of the artificial island or the deepwater wharf and reinforcing the foundation.
In the installation method of the island wall structure of the steel cylinder with the backfillable suction type cabin compartment design, in the sinking process of the steel cylinder device, the situation that the steel cylinder device sinks obliquely and one side is higher and the other side is lower as shown in a figure 7 occurs, a vacuum pump is used for applying larger negative pressure to the lower cabin at the high side, and a gas release valve of a vacuum barrel communicated with the cabin at the low side is opened; or the air relief valve is not opened, but water or air is filled into the lower sub-cabin at the low side, so that the effects of sinking of the lower sub-cabin at the high side and floating of the lower sub-cabin at the low side are achieved, and therefore rapid and active deviation correction is achieved, as shown in fig. 8;
or, as shown in b in fig. 7, water or gas in the lower sub-chamber on the high side is sucked, and meanwhile, sand or water in the upper sub-chamber on the low side is sucked, so that the purpose of realizing quick deviation rectifying and leveling as shown in c in fig. 7 is achieved.
Claims (7)
1. A suction type steel cylinder island wall structure capable of being backfilled is designed for a compartment, and is an arc-shaped revetment structure which is formed by connecting a plurality of steel cylinder devices end to end, inserting the lower parts of the steel cylinder devices into a seabed watertight layer or a weak permeable layer, wherein the steel cylinder devices comprise steel cylinders (1), first arc-shaped side wings (3) and second arc-shaped side wings (4) which are connected to two sides of each steel cylinder (1) through connecting rib plates (2), the upper end surfaces and the lower end surfaces of the first arc-shaped side wings (3) and the second arc-shaped side wings (4) are arranged in parallel and level with the upper end surfaces and the lower end surfaces of the steel cylinders (1), and an opening is far away from the steel cylinders (1), wherein the diameter of each second arc-shaped side wing (4) is larger than that of the corresponding first arc-shaped side wing (3), so that a sand-gravel cylinder (8) for backfilling can be formed by embedding the first arc-shaped side wings (3) of the next steel cylinder device into the second arc-shaped side wings (4) of the previous steel cylinder device, the steel cylinder (1) is divided into a lower compartment (6) and an upper compartment (7) by a horizontally arranged bulkhead plate (5), and is characterized in that a lower inner sleeve (9) is coaxially arranged in the lower compartment (6), the lower inner sleeve (9) is equal in height to the lower compartment (6), N lower sub-compartments (11) with the same size are formed between the inner wall of the lower compartment (6) and the outer wall of the lower inner sleeve (9) at equal intervals through N lower clapboards (10) which are vertically arranged, an upper inner sleeve (12) is coaxially arranged in the upper compartment (7), the upper inner sleeve (12) is equal in height to the upper compartment (7), N upper sub-compartments (14) with the same size are formed between the inner wall of the upper compartment (7) and the outer wall of the upper inner sleeve (12) at equal intervals through N upper clapboards (13) which are vertically arranged, and each upper sub-compartment (14) corresponds to one lower sub-compartment (11), the compartment plate (5) is provided with a water pumping/air hole (15) corresponding to each lower compartment (11) and each lower inner sleeve (9), each water pumping/air hole (15) is connected with a hose (16) which is communicated with the corresponding lower compartment (11) or each lower inner sleeve (9) and is used for pumping water or air from the lower compartment (11) or each lower inner sleeve (9), the other end of each hose (16) inserted into the lower compartment (11) penetrates through the corresponding upper compartment (14) and then is correspondingly connected with a vacuum barrel (17) arranged outside the steel cylinder device, and each vacuum barrel (17) is connected with a vacuum pump (18).
2. The subdivision bay designed backfillable suction type steel cylinder island wall structure according to claim 1, wherein the upper part of the vacuum tank (17) is provided with a release valve (19) for discharging the gas pumped out of the lower subdivision (11), and the lower part of the vacuum tank (17) is provided with a drain valve (20) for discharging the water pumped out of the lower subdivision (11).
3. The subdivision bay design backfillable suction type steel cylinder island wall structure of claim 1, wherein N is between 4 and 12.
4. The subdivision bay design backfilling suction type steel cylinder island wall structure according to claim 1, wherein the included angle between the circle centers of the first arc-shaped side wing (3) and the second arc-shaped side wing (4) and the line connecting the circle centers of the steel cylinders (1) is less than or equal to 180 degrees.
5. An installation method of a backfill suction type steel cylinder island wall structure designed for a compartment separation cabin is characterized by comprising the following steps:
1) the steel cylinder devices which are prefabricated in a factory and have required number and set size are transported to a specified place in a self-floating towing mode at sea, and are lifted by professional lifting equipment to be ready for penetration;
2) beginning to sink, utilizing a positioning system to enable the steel cylinder device to be in place at a designated position, firstly injecting a certain amount of water into each upper sub-chamber of an upper compartment of the steel cylinder device, and enabling the steel cylinder device to sink under the self-weight under the action of the water and the self-weight until each lower sub-chamber of a lower compartment forms a closed condition;
3) after the self-weight sinking is finished, one end of each hose for pumping water or air is respectively connected to the water pumping/air holes on the partition board and communicated with the corresponding lower sub-compartments, the other end of each hose is connected with a vacuum barrel, the vacuum barrel is connected with a vacuum pump, the vacuum pump is started to pump water and air in each lower sub-compartment, and the steel cylinder device sinks to a set depth under the action of negative pressure;
4) after the sinking is finished, filling sandy soil or water into each upper sub-chamber of the upper compartment according to the set requirement;
5) continuously sinking the next steel cylinder device, and embedding the first arc-shaped side wing (3) of the next steel cylinder device into the second arc-shaped side wing (4) of the previous steel cylinder device after sinking, so as to form a cylinder for backfilling gravel;
6) backfilling sandy soil in the formed cylindrical cylinder for backfilling the sandstone according to the design requirement;
7) repeating the steps 2) to 6) until all the steel cylinder devices are completely sunk, and forming an artificial island or a deep water wharf;
8) after sinking, the steel cylinder device is inclined under the combined action of the pile load in the island and the wave force outside the island, and the leveling is realized by backfilling water or gravel to the upper compartment positioned on the high side or pumping water or gravel to the upper compartment positioned on the low side;
9) backfilling the inner side of the artificial island or the deepwater wharf and reinforcing the foundation.
6. The method for installing a cofferdam designed backfilling suction type steel cylinder island wall structure according to claim 5, wherein in the sinking process of the steel cylinder device, when the situation that one side is higher and the other side is lower occurs, a vacuum pump is used for applying larger negative pressure to the lower cofferdam at the high side, and a release valve of a vacuum barrel communicated with the cofferdam at the low side is opened; or the air release valve is not opened, but water or air is filled into the lower sub-cabin at the low side, so that the effects of sinking of the lower sub-cabin at the high side and floating of the sub-cabin at the low side are generated, and therefore, the rapid and active deviation correction is realized, as shown in fig. 8a, 8b, 8c and 8 d;
or, the water or gas in the lower sub-cabin positioned on the high side is sucked, and the sand or water in the upper sub-cabin positioned on the low side is sucked, so that the purpose of quickly correcting deviation and leveling is achieved.
7. The method for installing the bulkhead design backfillable suction type steel cylinder island wall structure according to claim 5, wherein the steel cylinder device forming the corner position of the artificial island or the deep water wharf adopts a steel cylinder device in which the connecting line angle between the circle centers of the first arc-shaped side wing (3) and the second arc-shaped side wing (4) connected to the two sides of the steel cylinder (1) and the circle center of the steel cylinder (1) is a set angle smaller than 180 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110479757.3A CN113235515A (en) | 2021-04-30 | 2021-04-30 | Subdivision bulkhead designed backfill suction type steel cylinder island wall structure and installation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110479757.3A CN113235515A (en) | 2021-04-30 | 2021-04-30 | Subdivision bulkhead designed backfill suction type steel cylinder island wall structure and installation method |
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| CN114112303A (en) * | 2021-11-30 | 2022-03-01 | 天津大学 | Laboratory simulation device and method for offshore floating island-wave-prevention-anchoring system |
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