An air curtain niche structure for assisting sinking of steel caisson

Abstract

The present invention discloses an air curtain air niche structure for assisting the sinking of a steel caisson, and relates to the technical field of bridge foundation construction. The air curtain air niche structure comprises an air niche outer shell fixed to the inner side of the steel caisson wall plate, an air supply pipe for supplying high-pressure gas into the air niche outer shell, and an air inlet hole for connecting the air supply pipe and the air niche outer shell. A flow limiting structure for controlling the one-way flow of high-pressure gas in the air supply pipe along the air niche outer shell is provided at the air inlet hole. The air niche outer shell is provided with a plurality of air jet holes and a screen mesh corresponding to the air jet holes. By implementing the present technical solution, the technical problem that the existing air curtain air niche has a poor application effect in steel caissons can be effectively solved, which is not only conducive to further optimization of the sinking assistance measures, but also can effectively reduce the investment cost of the air curtain method in structural design, production and use, and has good practicality.

Description

Technical Field

[0001] The invention relates to the technical field of bridge foundation engineering, and in particular to an air curtain air niche structure for assisting the sinking of a steel caisson. Background Art

[0002] As bridge construction gradually develops towards longer spans, caissons are increasingly used as pier foundations and anchor foundations, and their plane dimensions and sinking depths are constantly increasing. The core difficulty in caisson foundation construction is the sinking of the caisson. During the construction process, caissons often encounter problems such as difficulty in sinking, sudden sinking, sinking deviation, and anti-floating, which bring certain difficulties to the construction.

[0003] In the actual construction process, the method of increasing the deadweight of the caisson, using a mud lubrication sleeve or an air curtain to reduce the frictional resistance of the outer wall of the caisson is often used to assist sinking or correct deviation. The caisson method of increasing the deadweight of the caisson is costly and has a limited effect on assisting sinking. Although sinking the caisson with a mud lubrication sleeve can assist sinking, after the caisson construction is completed, the side mold resistance recovers slowly, which is not conducive to the stress on the caisson structure. The air curtain method has a good effect and has become the preferred sinking aid for caisson construction. In the prior art, the air curtain assists the sinking of the caisson by pre-burying a number of pipes in the well wall, drilling a number of injection holes in the pipes along the direction perpendicular to the well wall, and passing high-pressure air into the pipes. The high-pressure air rises from the injection holes along the outside of the caisson wall to form a layer of air curtain. The air curtain is an airflow layer that continuously flows upward, thereby causing the soil particles to continuously flip upward and liquefy, reducing the frictional resistance between the well wall and the foundation soil, and promoting the smooth sinking of the caisson.

[0004] However, in actual engineering practice, the inventors of the present application discovered that the above-mentioned technology has at least the following technical problems: on the one hand, the steel caisson is large in size, its structural design and production are complex, and high manufacturing precision is required. Applying the existing air curtain structure on the basis of the complex structural design of the steel caisson will further increase the difficulty of structural design and production as well as the construction cost; on the other hand, in the process of using the existing air curtain to assist the sinking of the caisson, foreign mud and sand can easily enter the air supply pipe and cause the pipe to be blocked, making the air curtain aiding sinking measure ineffective and unable to be reused, with poor long-term effectiveness and low efficiency. Summary of the invention

[0005] In order to solve the technical problem that the above-mentioned prior art air curtain method has poor application effect in steel caissons, the purpose of the present invention is to provide an air curtain air niche structure for assisting the sinking of steel caissons, which can effectively prevent water and mud from entering the air supply pipe and causing pipe blockage, thereby achieving the long-term effectiveness of using air curtains to assist sinking and effectively improving the efficiency of using air curtains.

[0006] The technical solution adopted by the present invention is as follows:

[0007] An air curtain air niche structure for assisting sinking of a steel caisson, comprising

[0008] An air niche shell is fixed to the inner side of the steel caisson wall plate and corresponds to the through hole opened on the wall plate;

[0009] An air supply pipe, the air supply pipe is used to supply high-pressure gas into the gas niche shell;

[0010] An air inlet hole, which is arranged on the outer shell of the air niche and is used to connect the air supply pipe and the outer shell of the air niche;

[0011] The air inlet is provided with a flow limiting structure for controlling the unidirectional flow of high-pressure gas in the air delivery pipe into the gas niche shell; the gas niche shell is provided with a plurality of air injection holes corresponding to the through holes.

[0012] Optionally, a screen is provided inside the jet hole, and the screen is fixed on the inner wall of the air niche shell. The design of the screen can effectively prevent sediment particles with larger particle sizes from flowing into the air niche shell through the jet hole, thereby effectively preventing sediment particles from accumulating in the air niche and clogging the air supply pipe.

[0013] Optionally, the flow-limiting structure includes an elastic member and a sealing gasket, and the sealing gasket is arranged between the elastic member and the air inlet, and the elastic member is used to press the sealing gasket against the air outlet of the air inlet, and the upper surface of the sealing gasket covers the bottom surface of the air inlet. In this way, the high-pressure gas in the air supply pipe can make the sealing gasket move away from the air inlet along with the elastic member through the action of pressure, thereby allowing the high-pressure gas in the air supply pipe to flow to the inside of the air niche shell; on the other hand, when there is no ventilation, the sealing gasket seals the air outlet of the air inlet due to the pressing force of the elastic member, thereby preventing the external water and sediment entering the air niche from flowing to the air supply pipe through the air inlet, thereby causing blockage. The design of the flow-limiting structure can effectively provide a channel for the high-pressure gas in the air supply pipe to flow in one direction along the air niche shell, and cleverly solves the problem in the prior art that the air supply pipe is easily blocked and affects the long-term operation of the air curtain caisson. The structural design is reasonable and clever.

[0014] Optionally, the sealing pad is a rubber pad with a circular radial cross section, the rubber pad and the center line of the air inlet are on the same straight line, and the diameter of the rubber pad is larger than the diameter of the air inlet. The rubber pad has good impact resistance and is suitable for sealing the air inlet. The rubber pad is soft, dense, and has good elastic strength, which can achieve a good sealing effect and reduce elastic fatigue damage to the elastic part. The rubber pad and the center line of the air inlet are designed to be on the same straight line, which can ensure that the impact force on the rubber pad is balanced and stable, which is conducive to maintaining the long-term application of the current limiting structure.

[0015] Optionally, one end of the elastic member is fixed to the inner wall of the gas niche shell, and the sealing pad is fixed to the other end of the elastic member by an air nail. Specifically, in order to maintain the stability of the elastic member, it can be designed as an elastic steel plate, and the elastic steel plate is fixed to the inner wall of the gas niche shell by welding to ensure the sealing stability of the flow limiting structure.

[0016] Optionally, the air supply pipe is arranged at the upper end of the air niche shell and is vertically connected to the air niche shell. This arrangement structure design is convenient for arranging the air supply pipe on the inner side of the steel caisson wall plate, and on the other hand, water and silt can flow along the lower end of the air niche shell due to gravity and are not easy to flow directly along the upper end of the air niche shell, thereby reducing the possibility of water and silt flowing along the air inlet, thereby avoiding blockage of the air inlet and the air supply pipe.

[0017] Optionally, the upper end of the gas niche shell is arranged horizontally, and the lower end of the gas niche shell is provided with an inclined section, and the inclined section is arranged downwardly inclined along the side close to the steel caisson wall plate, and the air supply pipe is arranged at the upper end of the gas niche shell away from the steel caisson wall plate. In this way, the storage space of the gas niche shell along the side close to the steel caisson wall plate gradually increases. The design of the inclined section of the gas niche shell can save the use of materials and reduce the occupied space, thereby reducing the cost; on the other hand, it can further reduce the possibility of water and sediment flowing along the air inlet. The structural design is reasonable and ingenious.

[0018] Optionally, a horizontal section is further provided at the lower end of the air niche shell, and the inclined section of the air niche shell transitions to the steel caisson wall plate through the horizontal section. The design of the horizontal section of the air niche shell can reserve storage space for water and silt entering the air niche shell, reduce the possibility of water and silt flowing along the air inlet, and combined with the design of the flow limiting structure, can effectively solve the problem in the prior art that water and silt easily enter the air supply pipeline and cause pipeline blockage, thereby achieving long-term use of the air curtain.

[0019] Optionally, the air niche shell is a steel structure, and the air niche shell is welded to the steel caisson wall plate, so as to ensure the structural strength of the air niche structure and maintain the long-term operation of the air curtain-assisted caisson.

[0020] Optionally, the diameter of the jet hole is 0.2-1.5mm, and several of the jet holes are evenly distributed on the gas niche shell, and their distribution range covers the through holes opened on the well wall plate. After many experiments by the applicant, the diameter of the jet hole is designed to be 0.2-1.5mm, which can adapt to a variety of fine-grained soil layers during the sinking of the steel caisson, and try to avoid small particles of mud and sand from entering the gas niche shell; further, the jet holes evenly distributed on the gas niche shell make the ejected high-pressure gas evenly diffuse in the gas niche shell, and the jet holes within this range of diameters can achieve a better jet effect in a short time, and the distribution range of the jet holes makes the ejected high-pressure gas evenly diffuse in the gas niche shell to cover the through holes opened on the well wall plate, which can reduce the impact caused by installation errors.

[0021] As described above, the present invention has at least the following beneficial effects:

[0022] 1. The present invention uses the air curtain method to directly weld the air curtain air niche structure to the inner side of the steel caisson wall plate, avoiding the additional design of a fixing structure on the basis of the steel caisson with complex structural design. Compared with the existing concrete caisson that requires pre-embedded parts to be fixed in concrete, the fixing method of the air niche structure of the present invention is simpler and more convenient and can effectively ensure the fixing stability of its overall structure. Therefore, the air curtain air niche structure of the present invention is easy to install in the steel caisson structure, the overall structure has better steel structure strength, and can achieve better sinking-aiding effect.

[0023] 2. The air supply pipe of the present invention is located at the upper end of the air niche shell and is vertically connected to the air niche shell. On the one hand, it is conducive to the arrangement of the air supply pipe on the inner side of the steel caisson wall plate, and the design cost is low; on the other hand, water and sediment can flow along the lower end of the air niche shell due to gravity but are not easy to flow directly along the upper end of the air niche shell, thereby reducing the possibility of water and sediment flowing along the air inlet, which can further avoid the technical problem that the existing air inlet and the air supply pipe are easily blocked.

[0024] 3. The air curtain air niche structure of the present invention is provided with a flow limiting structure for controlling the one-way flow of high-pressure gas. The flow limiting structure allows the high-pressure gas in the air supply pipe to flow into the air niche and spray to the outside of the well wall through the gas injection holes on the outer shell of the air niche. The air niche structure is evenly staggered along the well wall, and an air curtain is formed around the steel caisson, which loosens and liquefies the foundation soil around the well wall, reduces the frictional resistance between the well wall and the foundation soil, and can achieve a good caisson sinking effect.

[0025] 4. The flow limiting structure of the present invention is designed by the coordination of the elastic member and the sealing gasket to limit the flow of water and sediment to the air supply pipe through the air inlet hole, which cleverly solves the problem of water and sediment easily entering the air supply pipe and causing pipe blockage in the prior art, significantly improves the operating efficiency of the air curtain assisted sinking caisson, and can effectively solve the problem of the mismatch between the existing investment and the benefits obtained.

[0026] 5. The lower end of the air niche shell of the present invention is provided with an inclined section which is inclined downward along the side close to the steel caisson wall. On the one hand, it can save the use of materials and reduce the occupied space, thereby reducing the cost; on the other hand, it can further reduce the possibility of water and sediment flowing along the air inlet. The structural design is reasonable and ingenious; and the inclined section transitions to the steel caisson wall plate through the horizontal section, which can reserve storage space for water and sediment, further reducing the possibility of water and sediment flowing along the air inlet. Combined with the design of the flow limiting structure, it can effectively solve the problem in the prior art that water and sediment easily enter the air supply pipe and cause pipe blockage, thereby achieving the long-term effectiveness of the air curtain-assisted caisson operation.

[0027] 6. The present invention provides a screen on the inner side of the jet hole, which can effectively prevent the sediment particles with larger particle size from flowing into the air niche through the jet hole, and further effectively prevent the sediment particles from being deposited in large quantities in the air niche, so that the air curtain-assisted sinking of the caisson can proceed smoothly, and has better practicality.

[0028] 7. The diameter of the jet hole is designed to be 0.2-1.5 mm in the present invention. After multiple tests by the applicant, it can be adapted to various soil layers with finer particles during the sinking of steel caissons, and prevent smaller particles of mud and sand from entering the outer shell of the air niche. The jet holes are appropriately densely arranged along the wall of the steel caisson, and a better jet effect can be achieved in a short time. The design of the air curtain air niche structure can not only reduce the initial investment cost, but also effectively improve the later caisson sinking efficiency. It innovatively solves the technical problems of high application cost and poor use effect of the existing air curtain method in steel caissons, and is also conducive to the further optimization of the air curtain sinking assistance measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be described by way of specific embodiments with reference to the accompanying drawings, in which

[0030] Figure 1 2 is a schematic structural diagram of an air curtain air niche structure for assisting the sinking of a steel caisson in an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 Schematic diagram of the inner wall of the air inlet side of the central gas niche shell;

[0032] Figure 3 yes Figure 1 A partial enlarged view of the middle current limiting structure;

[0033] Figure 4 yes Figure 1 Schematic diagram of the inner wall of the mesogastric shell on the fumarole side.

[0034] Explanation of the reference numerals: 10 - well wall plate; 11 - through hole; 20 - air supply pipe; 30 - air niche shell; 31 - inclined section; 32 - horizontal section; 33 - jet hole; 34 - air inlet hole; 40 - flow limiting structure; 41 - elastic member; 42 - sealing pad; 43 - air nail; 50 - screen. DETAILED DESCRIPTION

[0035] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0036] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0037] Example 1

[0038] The embodiment is basically as follows Figure 1 As shown: This embodiment provides an air curtain air niche structure for assisting the sinking of a steel caisson. The steel caisson wall is composed of a circumferential siding plate 10 and a plurality of through holes 11 are provided on the siding plate 10. The air curtain air niche structure is arranged corresponding to each through hole 11. Specifically, the air curtain air niche structure includes an air niche outer shell 30. The air niche outer shell 30 corresponds to the through hole 11 and is fixed to the inner side of the steel caisson siding plate 10. The air niche outer shell 30 is a steel structure. The specific fixing method of the air niche outer shell 30 and the steel caisson siding plate 10 is preferably welding, which is used to improve the overall structural strength of the air niche structure fixed to the steel caisson and maintain the long-term operation of the air curtain assisted sinking caisson.

[0039] The air niche structure also includes an air supply pipe 20 and an air inlet 34 provided on the air niche shell 30. The air supply pipe 20 is provided at the upper end of the air niche shell 30 and is connected to the air niche shell 30 through the air inlet 34; the air supply pipe 20 is used to supply high-pressure gas into the air niche shell 30, and the air supply pipe 20 is connected to a wind pressure device for providing high-pressure gas. The wind pressure device and the connection method between the wind pressure device and the air supply pipe 20 are both prior arts and are not the invention points of the present disclosure, and are not elaborated here; further, a flow limiting structure 40 is provided at the air inlet 34 for controlling the unidirectional flow of the high-pressure gas in the air supply pipe 20 into the air niche shell 30. The flow limiting structure 40 allows the high-pressure gas in the air supply pipe 20 to flow to the inside of the air niche shell 30, and limits water and sediment from flowing into the air supply pipe 20 through the air inlet 34, which can effectively avoid the problem of water and sediment entering the air supply pipe 20 and causing pipeline blockage.

[0040] A plurality of jet holes 33 corresponding to the through holes 11 are provided on the right side wall of the air niche shell 30, and the plurality of jet holes 33 are evenly distributed on the right side wall of the air niche shell 30, and their distribution range covers the cross-sectional area of ​​the through holes 11 provided on the well wall plate 10, so as to ensure that the high-pressure gas is evenly sprayed along the outer side of the well wall plate 10 through the jet holes 33 on the air niche shell 30, so as to loosen or liquefy the soil around the well wall plate 10 of the steel caisson, reduce the friction resistance between the well wall plate 10 and the foundation soil, and promote the smooth sinking of the caisson; and a screen 50 is provided on the inner side of the jet hole 33, and the screen 50 is fixed on the right side inner wall of the air niche shell 30. In this embodiment, a 20-mesh screen 50 is preferably arranged on the inner side of the jet hole 33 of the air niche shell 30. The design of the screen 50 can effectively prevent the sediment particles with larger particle size from flowing into the inside of the air niche shell 30 through the jet hole 33, and further effectively prevent the sediment particles from being deposited in large quantities in the air niche, so as to ensure the long-term operation of the air curtain-assisted sinking caisson.

[0041] The specific implementation method of this embodiment is as follows: the steel caisson is assisted to sink by using the air curtain air niche structure of this embodiment. First, the wind pressure equipment delivers high-pressure gas into the air niche shell 30 through the air supply pipe 20 and the air inlet 34. Then, the high-pressure gas is uniformly sprayed along the outer side of the well wall plate 10 through the through hole 11 by several jet holes 33 on the right side wall of the air niche shell 30. The high-pressure gas rises along the periphery of the steel caisson well wall plate 10 to form an air curtain, so that the soil around the steel caisson wall plate 10 is loosened or liquefied, reducing the frictional resistance between the wall plate and the foundation soil, and promoting the smooth sinking of the caisson. During the sinking process, due to the setting of the screen 50 inside the jet hole 33, it can effectively prevent the sediment particles with larger particle size from entering the air niche shell 30, avoiding the sediment particles from being deposited in large quantities in the air niche. Then, the flow limiting structure 40 provided at the air inlet 34 only allows the high-pressure air to flow into the air niche. The unidirectional flow from the air supply pipe 20 to the air niche shell 30 is carried out without allowing water and silt particles to flow to the air supply pipe 20 through the air inlet hole 34, which can effectively avoid the problem of water and silt entering the air supply pipe 20 and causing the pipe to be blocked, thereby achieving the long-term operation of the air curtain assisted sinking caisson. In the present embodiment, the air curtain method caisson is applied to weld the air curtain air niche structure directly to the inner side of the steel caisson wall plate, so as to avoid the additional design of a fixed structure on the basis of a steel caisson with complex structural design. Compared with the existing concrete caisson that requires embedded parts to be fixed in concrete, the fixing method of the air niche structure in the present embodiment is simpler and more convenient and can effectively ensure the fixed stability of its overall structure. Therefore, the air curtain air niche structure in the present embodiment is easy to install in the steel caisson structure, and the overall structure has good steel structure strength, and can achieve a better sinking-assisted effect.

[0042] Example 2

[0043] Example 2 is basically the same as Example 1, except that: Figures 1 to 4As shown, the gas niche shell 30 includes three sections of steel plates in the upper horizontal direction, the right vertical direction and the left inclined direction. The processing accuracy is easy to control, the cost is low and it is easy to obtain. There is no need to embed other fixings in the well wall plate 10, which significantly reduces the initial investment cost. Furthermore, in order to reduce the possibility of water and sediment flowing along the air inlet 34 and avoid clogging the air inlet 34 and the air supply pipe 20, the upper end of the gas niche shell 30 is horizontally arranged, and the air supply pipe 20 is arranged at the upper end of the gas niche shell 30 and vertically connected with the gas niche shell 30. This arrangement structure design is convenient for arranging the air supply pipe 20 on the inner side of the steel caisson well wall plate 10 on the one hand, and on the other hand, water and sediment can flow along the lower end of the gas niche shell 30 due to gravity instead of directly flowing along the upper end of the gas niche shell 30, and are not easy to approach the air inlet 34.

[0044] The lower left end of the air niche shell 30 is an inclined section 31 which is inclined downward along the side close to the steel caisson wall plate 10, so that the storage space of the air niche shell 30 along the side close to the steel caisson wall plate 10 gradually increases, and the air supply pipe 20 is arranged at the upper end of the air niche shell 30 away from the steel caisson wall plate 10; on the one hand, it can save the use of materials and reduce the occupied space, thereby reducing the cost; on the other hand, it can further reduce the possibility of water and sediment flowing along the air inlet 34, and the air niche shell 3 There is a horizontal section 32 between the inclined section 31 and the right vertical steel plate. The inclined section 31 of the air niche shell 30 transitions to the steel caisson wall plate 10 through the horizontal section 32, which can reserve storage space for water and sediment entering the air niche shell 30, reduce the possibility of water and sediment flowing along the air inlet 34, and combine with the design of the flow limiting structure 40 to effectively solve the problem of water and sediment easily entering the air supply pipe 20 in the prior art and causing pipe blockage, so as to achieve the long-term operation of the air curtain to assist the sinking of the caisson. The structural design is reasonable and ingenious.

[0045] Example 3

[0046] Example 3 is basically the same as Example 2, except that: Figures 1 to 3As shown, the flow limiting structure 40 specifically includes an elastic member 41 and a sealing gasket 42. The right end of the elastic member 41 is fixed on the inner wall of the upper end of the gas niche shell 30 in the horizontal direction, and the left end of the elastic member 41 extends to the air inlet hole 34. The sealing gasket 42 is arranged between the elastic member 41 and the air inlet hole 34 and is fixed to the left end of the elastic member 41 through an air nail 43. The number of air nails 43 provided in this embodiment is four, and the four air nails 43 are evenly arranged at equal angles along the circumference of the sealing gasket 42. The elastic member 41 is used to press the sealing gasket 42 toward the air outlet end of the air inlet hole 34, and the upper surface of the sealing gasket covers the bottom surface of the air inlet hole 34. Specifically, in order to maintain the stability of the elastic member 41, it can be designed as an elastic steel plate, and the elastic The right end of the steel plate is welded to the inner wall of the air niche shell 30 by three-sided welding. In this way, the high-pressure gas in the air supply pipe 20 can make the sealing gasket 42 move away from the air inlet 34 along with the elastic steel plate through the action of pressure, thereby allowing the high-pressure gas in the air supply pipe 20 to flow to the inside of the air niche shell 30; if there is water or mud on the inside of the air niche shell 30 and no high-pressure gas is introduced, the sealing gasket will seal the outlet end of the air inlet 34 due to the pressing force of the elastic steel plate, thereby preventing water and mud from flowing to the air supply pipe 20 through the air inlet 34. The design of the flow limiting structure 40 cleverly solves the problem in the prior art that the air supply pipe 20 is easily blocked and affects the long-term operation of the air curtain assisted sinking caisson. The structural design is reasonable and clever.

[0047] The diameter of the air inlet 34 provided in this embodiment is preferably a 3mm small hole, which is formed by punching a hole at the upper left end of the air niche shell 30. The sealing pad is a rubber pad with a circular radial cross section. The rubber pad and the center line of the air inlet 34 are on the same straight line, and the diameter of the rubber pad is larger than the diameter of the air inlet 34. The rubber pad has good impact resistance and is suitable for sealing the air inlet 34. The rubber pad is soft, dense, and has good elastic strength, which can achieve a good sealing effect and reduce the elastic fatigue damage of the elastic member 41. The rubber pad and the center line of the air inlet 34 are designed to be on the same straight line, which can ensure that the impact force on the rubber pad is balanced and stable, which is conducive to maintaining the long-term application of the flow limiting structure 40 and has good practicality.

[0048] Example 4

[0049] Example 4 is basically the same as Example 3, except that: Figure 1 and Figure 4As shown, in order to adapt to a variety of fine-grained soil layers, the diameter of the jet holes 33 on the gas niche shell 30 is preferably 0.2-1.5 mm. The diameter of the through hole 11 on the steel caisson wall plate 10 provided in this embodiment is 30 mm, the diameter of the jet hole 33 is 1.5 mm, the spacing between two adjacent jet holes 33 in the horizontal direction is 2.5 mm, and the jet holes 33 are distributed in a hexagon as a whole, with 8 jet holes 33 arranged on the outermost side of the hexagon, a total of 169 holes, and 169 jet holes 33 are evenly distributed on the right vertical side wall of the gas niche shell 30, and their distribution range covers the area of ​​the through hole 11 opened on the wall plate 10. After many experiments by the applicant, the diameter of the jet hole 33 is designed to be 0.2-1.5mm, which can adapt to a variety of fine-grained soil layers during the sinking of the steel caisson and try to avoid small particles of mud and sand from entering the air niche shell 30; and the jet holes 33 are densely arranged along the wall of the steel caisson, and the jet holes 33 evenly distributed on the air niche shell 30 make the injected high-pressure gas evenly diffuse in the air niche shell 30. The jet holes 33 of this structural design can achieve a good jet effect in a short time, and the distribution range of the jet holes 33 makes the injected high-pressure gas evenly diffuse in the air niche shell 30 to cover the through holes 11 opened on the wall plate 10, which can effectively reduce the impact caused by installation errors and has good adaptability; the air curtain air niche structure innovatively solves the technical problems of high application cost and poor use effect of the existing air curtain method in steel caissons, and is also conducive to the further optimization of the air curtain sinking assistance measures.

[0050] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. An air curtain air niche structure for assisting sinking of a steel caisson, characterized in that: include An air niche shell is fixed to the inner side of the steel caisson wall plate and corresponds to the through hole opened on the wall plate; An air supply pipe, the air supply pipe is used to supply high-pressure gas into the gas niche shell; An air inlet hole, which is arranged on the outer shell of the air niche and is used to connect the air supply pipe and the outer shell of the air niche; The air inlet is provided with a flow limiting structure for controlling the one-way flow of high-pressure gas in the air delivery pipe into the gas niche shell; the gas niche shell is provided with a plurality of air injection holes corresponding to the through holes; The air supply pipe is arranged at the upper end of the gas niche shell and is vertically connected with the gas niche shell; The upper end of the gas niche shell is arranged horizontally, and the lower end of the gas niche shell is provided with an inclined section, and the inclined section is arranged downwardly inclined along the side close to the steel caisson wall plate, and the air supply pipe is arranged at the upper end of the gas niche shell away from the steel caisson wall plate; The flow limiting structure includes an elastic member and a sealing gasket, and the sealing gasket is arranged between the elastic member and the air inlet, and the elastic member is used to press the sealing gasket toward the air outlet end of the air inlet, and the upper surface of the sealing gasket covers the bottom surface of the air inlet; one end of the elastic member is fixed to the inner wall of the air niche shell on one side close to the steel caisson wall, and the sealing gasket is fixed to the other end of the elastic member by an air nail.

2. The air curtain air niche structure for assisting sinking of a steel caisson according to claim 1 is characterized in that: A screen is arranged on the inner side of the air injection hole, and the screen is fixed on the inner wall of the air niche shell.

3. The air curtain air niche structure for assisting sinking of a steel caisson according to claim 1 is characterized in that: The sealing pad is a rubber pad with a circular radial cross section. The center line of the rubber pad and the air inlet hole are on the same straight line, and the diameter of the rubber pad is greater than the diameter of the air inlet hole.

4. The air curtain air niche structure for assisting sinking of a steel caisson according to claim 1 is characterized in that: The lower end of the gas niche shell is also provided with a horizontal section, and the inclined section of the gas niche shell transitions to the steel caisson wall plate through the horizontal section.

5. The air curtain air niche structure for assisting sinking of a steel caisson according to claim 1 is characterized in that: The gas niche shell is a steel structure, and the gas niche shell is welded to the steel caisson wall plate.

6. The air curtain air niche structure for assisting sinking of a steel caisson according to claim 1 is characterized in that: The diameter of the gas injection hole is 0.2-1.5 mm, and a plurality of the gas injection holes are evenly distributed on the gas niche outer shell, and their distribution range covers the through holes opened on the well wall plate.

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