CN211621646U - Air curtain air niche structure for assisting sinking of steel open caisson - Google Patents
Air curtain air niche structure for assisting sinking of steel open caisson Download PDFInfo
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- CN211621646U CN211621646U CN201921760290.4U CN201921760290U CN211621646U CN 211621646 U CN211621646 U CN 211621646U CN 201921760290 U CN201921760290 U CN 201921760290U CN 211621646 U CN211621646 U CN 211621646U
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Abstract
The utility model discloses an air curtain air niche structure for assisting sinking of a steel open caisson, relating to the technical field of bridge foundation construction; the device comprises an air niche shell fixed on the inner side of a steel open caisson well wall plate, an air supply pipe used for supplying high-pressure air into the air niche shell, and an air inlet hole used for communicating the air supply pipe and the air niche shell, wherein a flow limiting structure used for controlling the one-way circulation of the high-pressure air in the air supply pipe along the air niche shell is arranged at the air inlet hole, and a plurality of air injection holes and a screen corresponding to the air injection holes are arranged on the air niche shell; through implementing this technical scheme, can effectively solve the poor technical problem of current air curtain air shrine application effect in the steel open caisson, not only do benefit to the further optimization of helping the heavy measure, also can effectively reduce the input cost of using the air curtain method on structural design preparation and use, have better practicality.
Description
Technical Field
The utility model relates to a bridge foundation engineering technical field especially relates to an air curtain gas shrine structure of steel open caisson helping heavy usefulness.
Background
With the gradual development of bridge construction towards a large-span direction, open caisson is more and more widely applied as a pier foundation and an anchorage foundation, and the plane size and the sinking depth of the open caisson are continuously increased. The key difficult problem of open caisson foundation construction is the sinking of the open caisson, and the open caisson often encounters the problems of difficult sinking, sudden sinking, sinking deflection, anti-floating and the like in the construction process, thereby bringing certain difficulty to the construction.
In the actual construction process, the method of increasing the dead weight of the open caisson, and reducing the frictional resistance of the outer wall of the open caisson by a mud lubricating sleeve or an air curtain is often adopted for assisting the sinking or correcting the deviation. The open caisson mode for increasing the dead weight of the open caisson has high cost and limited sinking-assisting effect; the sinking of the open caisson by using the slurry lubricating sleeve can play a role in sinking, but after the open caisson construction is completed, the resistance of the side mold is slowly recovered, so that the stress on the open caisson structure is not favorable; the air curtain method has good effect and becomes a sinking-assisting measure preferentially selected by open caisson construction. The air curtain helps heavy open caisson is specifically through pre-buried a plurality of pipelines in the wall of a well, and a plurality of pipelines drill out a plurality of jet orifices along perpendicular wall of a well direction, lets in high-pressure air in the pipeline, and high-pressure air rises along the open caisson wall outside from the jet orifice, forms one deck air curtain, and the air curtain is a continuous upflow's air current layer, and then makes the soil granule constantly upwards turn the liquefaction, reduces the frictional resistance between the wall of a well and the foundation soil, makes the open caisson sink smoothly.
However, in practical engineering practice, the inventors of the present application found that the above-mentioned technology has at least the following technical problems: on one hand, the steel open caisson has large volume, complex structural design and manufacture and high requirement on manufacturing precision, and the structural design and manufacture difficulty and the construction cost are further increased by applying the existing air curtain structure on the basis of the complex structural design of the steel open caisson; on the other hand, in the process of adopting the existing air curtain to assist the sinking well, external silt is easy to enter an air supply pipeline so as to cause pipeline blockage, so that the air curtain sinking assisting measure is invalid and cannot be reused, the long-term service life is poor, and the use benefit is low.
SUMMERY OF THE UTILITY MODEL
For solving the above-mentioned prior art air curtain method poor technical problem of application effect in the steel open caisson, the utility model aims to provide an air curtain air niche structure of usefulness is helped sinking by steel open caisson can effectively avoid water and silt to get into the problem that leads to the pipe blockage in the air-supply pipe, can reach the long-term of using the air curtain to help sinking, and can effectively improve the air curtain result of use.
The utility model adopts the technical scheme as follows:
an air curtain air niche structure for assisting sinking of steel open caisson comprises
The gas niche shell is fixed on the inner side of the well wall plate of the steel open caisson and corresponds to the through hole formed in the well wall plate;
an air feed pipe for feeding high pressure gas into the niche housing;
the air inlet is formed in the air niche shell and used for communicating the air supply pipe with the air niche shell;
the air inlet is provided with a flow limiting structure for controlling the one-way circulation of the high-pressure gas in the air supply pipe to the air niche shell; and a plurality of air injection holes corresponding to the through holes are formed in the air niche shell.
Optionally, a screen is provided inside the gas injection holes, which screen is fixed to the inner wall of the air niche housing. The design of screen cloth can effectively avoid the great silt particle of particle diameter to flow to inside the gas niche shell through the fumarole, and then can effectively avoid silt particle to deposit and block up the blast pipe in the gas niche.
Optionally, the flow limiting structure comprises an elastic piece and a sealing cushion block, the sealing cushion block is arranged between the elastic piece and the air inlet hole, the elastic piece is used for enabling the sealing cushion block to compress the air outlet end of the air inlet hole, and the upper surface of the sealing cushion covers the bottom surface of the air inlet hole. Therefore, the sealing cushion block can be far away from the air inlet hole along with the elastic piece under the action of pressure of the high-pressure gas in the air supply pipe, so that the high-pressure gas in the air supply pipe is allowed to flow to the inside of the air niche shell; on the other hand, when the air is not ventilated, the sealing gasket seals the air outlet end of the air inlet hole due to the pressing force of the elastic piece, so that the phenomenon that external water and silt entering the air niche flow to the air supply pipe through the air inlet hole to cause blockage is avoided. The design of the flow limiting structure can effectively provide a channel for one-way circulation of high-pressure gas in the gas supply pipe along the gas niche shell, the problem that the long-term operation of the air curtain open caisson is influenced because the gas supply pipe is easily blocked in the prior art is ingeniously solved, and the structural design is reasonable and ingenious.
Optionally, the sealing gasket is a rubber cushion block with a circular radial cross section, the center lines of the rubber cushion block and the air inlet hole are on the same straight line, and the diameter of the rubber cushion block is larger than that of the air inlet hole. The rubber cushion block has good impact resistance and is suitable for sealing the air inlet, and the rubber cushion block has soft texture, compact structure and better elastic strength, thereby achieving better sealing effect and relieving the elastic fatigue damage of the elastic part; the center lines of the rubber cushion block and the air inlet hole are designed on the same straight line, so that the balance and stability of the impact force applied to the rubber cushion block can be ensured, and the long-term effect of the application of the flow limiting structure can be kept.
Alternatively, one end of the elastic member is fixed to the inner wall of the air niche housing, and the sealing pad block is fixed to the other end of the elastic member by an air nail. Specifically, the elastic steel plate can be designed to maintain the stability of the elastic element, and the elastic steel plate is fixed on the inner wall of the air niche shell in a welding manner, so that the sealing stability of the flow limiting structure is ensured.
Optionally, the air feed pipe is provided at the upper end of the air niche housing and vertically communicates with the air niche housing. By adopting the arrangement structure design, on one hand, the air supply pipe is convenient to arrange on the inner side of the well wall plate of the steel open caisson, on the other hand, water and silt can flow along the lower end of the air niche shell under the action of gravity and cannot flow directly along the upper end of the air niche shell, so that the possibility that the water and the silt flow along the air inlet hole is reduced, and the air inlet hole and the air supply pipe are prevented from being blocked.
Optionally, the upper end of the gas niche shell is horizontally arranged, the lower end of the gas niche shell is provided with an inclined section, the inclined section is obliquely and downwards arranged along one side close to the wall plate of the steel open caisson, and the air supply pipe is arranged at the upper end of one side of the gas niche shell far away from the wall plate of the steel open caisson. Therefore, the memory space of the gas niche shell along one side close to the steel open caisson well wall plate is gradually increased, and the design of the inclined section of the gas niche shell can save the use of materials, reduce the occupied space and reduce the cost on one hand; on the other hand, the possibility that water and silt flow along the air inlet hole is further reduced, and the structural design is reasonable and ingenious.
Optionally, the lower end of the gas niche outer shell is further provided with a horizontal section, and the inclined section of the gas niche outer shell is transited to the steel open caisson wall plate through the horizontal section. The design of gas shrine shell horizontal segment can reserve storage space for getting into water and silt in the gas shrine shell, reduces the possibility that water and silt flow along the inlet port, combines the design of current-limiting structure can effectively solve prior art normal water and silt and get into the problem that air supply pipe leads to the pipeline to block up easily, reaches the long-term effect that the air curtain used.
Optionally, the gas niche shell is made of a steel structure, and the gas niche shell is welded with a steel open caisson wall plate. The structural strength of the air niche structure is ensured, and the long-acting effect of the air curtain assisted caisson operation is kept.
Optionally, the diameter of the gas injection hole is 0.2-1.5mm, and a plurality of the gas injection holes are uniformly distributed on the gas niche shell and the distribution range of the gas injection holes covers through holes formed in the well wall plate. Through multiple experiments of an applicant, the diameter of the air injection hole is designed to be 0.2-1.5mm, and the steel open caisson can adapt to various fine-grained soil layers during sinking, so that silt with smaller grains is prevented from entering an air niche shell as much as possible; furthermore, the jet holes uniformly distributed on the air niche shell enable the jetted high-pressure air niche shell to be uniformly diffused, the jet holes in the diameter range can achieve a good jet effect in a short time, and the jet holes are distributed in a range that the jetted high-pressure air niche shell is uniformly diffused and covered on through holes formed in a well wall plate, so that the influence caused by installation errors can be reduced.
As described above, the present invention has at least the following advantages:
1. the utility model discloses use air curtain method open caisson to weld air curtain gas shrine structure in steel open caisson wall panel inboard directly, avoid additionally designing fixed knot on the steel open caisson basis that structural design is complicated to construct, need the built-in fitting to fix the fixed mode in the concrete for current muddy earth open caisson, the utility model discloses the fixed mode of gas shrine structure is more simple and convenient and can effectively guarantee its overall structure's fixed stability, uses from this the utility model discloses its simple to operate and overall structure have better steel construction intensity in steel open caisson structure of air curtain gas shrine structure to can get better helping and sink the effect.
2. The air supply pipe of the utility model is positioned at the upper end of the air niche shell and is vertically communicated with the air niche shell, which is beneficial to the arrangement of the air supply pipe at the inner side of the well wall plate of the steel open caisson on the one hand and has low design cost; on the other hand, water and silt can flow along the lower end of the air niche shell due to the action of gravity and cannot flow directly along the upper end of the air niche shell, so that the possibility that the water and the silt flow along the air inlet hole is reduced, and the technical problem that the existing air inlet hole and the air supply pipe are easy to block can be further solved.
3. The utility model discloses be provided with the current-limiting structure of the one-way circulation of control high-pressure gas in the air curtain gas shrine structure, the current-limiting structure allows the high-pressure gas in the air feed pipe to flow to inside the gas shrine and spout to the wall of a well outside through the fumarole on the gas shrine shell, and the gas shrine structure is evenly staggered along the wall of a well and is arranged, forms the air curtain all around the steel open caisson, makes the wall of a well around the subsoil become flexible and liquefaction, reduces the frictional resistance between the wall of a well and the subsoil, can get the good open caisson sinking effect.
4. The utility model discloses the current-limiting structure can restrict water and silt to flow to the blast pipe through the inlet port by the cooperation design of elastic component and sealed pad, has solved the problem that prior art normal water and silt enter easily and lead to the pipeline to block up in the blast pipe ingeniously, has shown to improve the operational timeliness of air curtain sinking-assisted open caisson, can effectively solve the problem that the benefit of current input and acquisition is not assorted, 5. the utility model discloses the lower extreme of gas niche shell is equipped with one along being close to the slope section of steel open caisson wall of a well one side downward sloping, can save the use of material and reduce occupation space on the one hand, reduces and expends the cost; on the other hand, the possibility that water and silt flow along the air inlet can be further reduced, and the structure is reasonable and ingenious in design; and the inclined section is transited to the steel open caisson wall plate through the horizontal section, so that a storage space for water and sediment can be reserved, the possibility of water and sediment flowing along the air inlet hole is further reduced, the problem that water and sediment easily enter the air supply pipe to cause pipeline blockage in the prior art can be effectively solved by combining the design of the flow limiting structure, and the long-term effect of the operation of the air curtain assisted open caisson is achieved.
6. The utility model discloses be equipped with the screen cloth in the inboard of fumarole, can effectively avoid the great silt granule of particle diameter to flow to the gas niche inside through the fumarole, and then can effectively avoid the silt granule to deposit in a large amount in the gas niche, make the air curtain help the open caisson to go on smoothly, have better practicality.
7. The diameter of the air injection hole is designed to be 0.2-1.5mm, and the device can be suitable for various soil layers with thinner particles in the sinking process of the steel open caisson through a plurality of tests of an applicant, so that silt with smaller particles is prevented from entering the air niche shell; and the air injection holes are arranged along the wall of the steel open caisson in a proper amount and are dense, so that a better air injection effect can be achieved in a short time, the design of the air curtain air niche structure can reduce the early-stage investment cost, also can effectively improve the later-stage open caisson sinking-assisting work efficiency, innovatively solves the technical problems of high application cost and poor use effect of the existing air curtain method in the steel open caisson, and is also beneficial to further optimization of the application of air curtain sinking-assisting measures.
Drawings
The invention will be described by way of example only and with reference to the accompanying drawings, in which
Fig. 1 is a schematic structural view of an air curtain air niche structure for assisting sinking of a steel open caisson according to an embodiment of the present invention;
figure 2 is a schematic illustration of the inner wall of the air niche housing of figure 1 on the air inlet side;
FIG. 3 is an enlarged view of a portion of the flow restricting structure of FIG. 1;
figure 4 is a schematic illustration of the inside wall of the air niche housing on the side of the air vent of figure 1.
Description of reference numerals: 10-a well wall plate; 11-a through hole; 20-an air supply pipe; 30-gas niche housing; 31-an inclined section; 32-horizontal section; 33-gas injection holes; 34-an air intake; 40-a current limiting structure; 41-an elastic member; 42-sealing cushion blocks; 43-gas nail; 50-screen mesh.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1
The embodiment is basically as shown in figure 1: the embodiment provides an air curtain air niche structure for assisting sinking of a steel open caisson, wherein a steel open caisson wall is formed by a circumferential well wall plate 10, a plurality of through holes 11 are formed in the well wall plate 10, and the air curtain air niche structure is arranged corresponding to each through hole 11; specifically, the air curtain air niche structure comprises an air niche outer shell 30, the air niche outer shell 30 corresponds to the through hole 11 and is fixed on the inner side of the steel open caisson wall plate 10, the air niche outer shell 30 is of a steel structure, and the air niche outer shell 30 and the steel open caisson wall plate 10 are preferably welded in a specific fixing mode and used for improving the overall structural strength of the air niche structure fixed on the steel open caisson and keeping the long-term effect of the air curtain auxiliary open caisson operation.
The air niche structure further comprises an air supply pipe 20 and an air inlet hole 34 formed in the air niche shell 30, wherein the air supply pipe 20 is arranged at the upper end of the air niche shell 30 and is communicated with the air niche shell 30 through the air inlet hole 34; the air supply pipe 20 is used for supplying high-pressure air into the air niche shell 30, a wind pressure device for supplying high-pressure air is connected outside the air supply pipe 20, and the wind pressure device and the connection mode of the wind pressure device and the air supply pipe 20 are the prior art, which are not the points of the utility model of the disclosure and are not described herein again; furthermore, a flow limiting structure 40 for controlling the one-way flow of the high-pressure gas in the air supply pipe 20 into the air niche shell 30 is arranged at the air inlet hole 34, and the flow limiting structure 40 allows the high-pressure gas in the air supply pipe 20 to flow to the inner side of the air niche shell 30 and limits the flow of water and silt into the air supply pipe 20 through the air inlet hole 34, so that the problem of pipeline blockage caused by the fact that the water and silt enter the air supply pipe 20 can be effectively avoided.
The right side wall of the gas niche shell 30 is provided with a plurality of gas injection holes 33 corresponding to the through holes 11, the plurality of gas injection holes 33 are uniformly distributed on the right side wall of the gas niche shell 30, and the distribution range of the gas injection holes covers the sectional area of the through holes 11 formed in the well wall plate 10, so that high-pressure gas can be uniformly injected along the outer side of the well wall plate 10 through the gas injection holes 33 on the gas niche shell 30, soil around the steel open caisson well wall plate 10 is loosened or liquefied, the frictional resistance between the open well wall plate 10 and foundation soil is reduced, and the open well is enabled to sink smoothly; and the screen 50 is arranged on the inner side of the air injection hole 33, and the screen 50 is fixed on the right inner wall of the air niche housing 30, the screen 50 with 20 meshes is preferably arranged on the inner side of the air injection hole 33 of the air niche housing 30, and the screen 50 is designed to effectively prevent silt particles with larger particle sizes from flowing into the air niche housing 30 through the air injection hole 33, so that the silt particles can be effectively prevented from being deposited in the air niche in a large amount, and the long-term operation of the air curtain assisted sinking well is ensured.
The specific implementation manner of this embodiment is: the air curtain air niche structure is utilized to assist sinking of the steel open caisson, firstly, high-pressure air is sent into an air niche shell 30 through an air supply pipe 20 and an air inlet 34 by an air pressure device, then the high-pressure air is uniformly sprayed along the outer side of a well wall plate 10 through a plurality of air injection holes 33 on the right side wall of the air niche shell 30 through holes 11, and the high-pressure air rises along the periphery of the steel open caisson wall plate 10 to form an air curtain, so that soil around the steel open caisson wall plate 10 is loosened or liquefied, the frictional resistance between the wall plate and foundation soil is reduced, and the open caisson is enabled to sink smoothly; in the process of sinking, due to the arrangement of the screen 50 at the inner side of the air injection hole 33, the silt particles with larger particle sizes can be effectively prevented from entering the air niche shell 30, and the silt particles are prevented from being deposited in the air niche in a large amount; the flow limiting structure 40 arranged at the air inlet 34 only allows the high-pressure air to flow into the air niche shell 30 through the air supply pipe 20 for one-way circulation, but does not allow water and silt particles to flow into the air supply pipe 20 through the air inlet 34, so that the problem of pipeline blockage caused by the fact that the water and the silt enter the air supply pipe 20 can be effectively avoided, and the long-term service life of the air curtain assisted caisson operation is further achieved; the open caisson adopting the air curtain method in the embodiment is characterized in that the air curtain air niche structure is directly welded on the inner side of the wall plate of the steel open caisson, the additional design of a fixing structure on the basis of the steel open caisson with a complex structural design is avoided, and compared with the fixing mode that the embedded parts are fixed in concrete in the existing concrete open caisson, the fixing mode of the air curtain air niche structure is simpler and more convenient and can effectively ensure the fixing stability of the whole structure, therefore, the air curtain air niche structure is applied, the installation is convenient and the whole structure has better steel structural strength in the steel open caisson structure, and better sinking assisting effect can be obtained.
Example 2
Example 2 is essentially the same as example 1, except that: as shown in fig. 1 to 4, the niche casing 30 includes three sections of steel plates in the upper horizontal direction, the right vertical direction, and the left oblique direction, so that the processing precision is easy to control, the cost is low, the niche casing is convenient to obtain, other fixing parts do not need to be embedded in the well wall plate 10, and the early investment cost is significantly reduced; further, in order to reduce the possibility of water and sediment flowing along the air inlet holes 34 and avoid blocking the air inlet holes 34 and the air supply pipe 20, the upper end of the air niche shell 30 is horizontally arranged, the air supply pipe 20 is arranged at the upper end of the air niche shell 30 and is vertically communicated with the air niche shell 30, the air supply pipe 20 is conveniently arranged inside the steel open caisson wall plate 10 by adopting the arrangement structure, and on the other hand, water and sediment can flow along the lower end of the air niche shell 30 due to the gravity and can not directly flow along the upper end of the air niche shell 30, so that the air inlet holes 34 are not easy to be accessed.
The left lower end of the gas niche shell 30 is an inclined section 31 which is obliquely arranged, the inclined section 31 is inclined downwards along one side close to the steel open caisson wall plate 10, so that the memory space of the gas niche shell 30 along one side close to the steel open caisson wall plate 10 is gradually increased, and the gas supply pipe 20 is arranged at the upper end of one side of the gas niche shell 30 far away from the steel open caisson wall plate 10; on one hand, the use of materials can be saved, the occupied space can be reduced, and the cost can be reduced; on the other hand, the possibility that water and silt flow along the air inlet 34 is further reduced, a horizontal section 32 is arranged between the inclined section 31 and the right vertical steel plate of the air niche shell 30 for transition, the inclined section 31 of the air niche shell 30 is in transition to the steel open caisson wall plate 10 through the horizontal section 32, a storage space can be reserved for the water and the silt entering the air niche shell 30, the possibility that the water and the silt flow along the air inlet 34 is reduced, the problem that the pipeline is blocked because the water and the silt easily enter the air supply pipe 20 in the prior art can be effectively solved by combining the design of the flow limiting structure 40, the long-term effect of the operation of the air curtain assisted open caisson is achieved, and the structural design is reasonable and ingenious.
Example 3
Example 3 is essentially the same as example 2, except that: referring to fig. 1 to 3, the flow-limiting structure 40 specifically includes an elastic member 41 and a sealing pad 42, a right end of the elastic member 41 is fixed on an inner wall of the upper end of the air niche housing 30 in a horizontal direction, a left end of the elastic member 41 extends to the air inlet hole 34, the sealing pad 42 is disposed between the elastic member 41 and the air inlet hole 34 and fixed to a left end of the elastic member 41 by air nails 43, the number of the air nails 43 provided in this embodiment is four, the four air nails 43 are uniformly arranged along a circumferential direction of the sealing pad 42 at equal angles, the elastic member 41 is used for pressing the sealing pad 42 toward an air outlet end of the air inlet hole 34, and an upper surface of the sealing pad covers a bottom surface of the air inlet; specifically, the elastic member 41 can be designed as an elastic steel plate for maintaining the stability of the fixing, and the right end of the elastic steel plate is welded to the inner wall of the niche casing 30 by a three-sided welding method, so that the high-pressure gas in the air supply pipe 20 can make the sealing pad 42 be far away from the air inlet hole 34 along with the elastic steel plate by the pressure effect, thereby allowing the high-pressure gas in the air supply pipe 20 to flow to the inside of the niche casing 30; if water or silt exists inside the air niche shell 30 and high-pressure air is not introduced, the air outlet end of the air inlet hole 34 is sealed by the sealing gasket due to the pressing force of the elastic steel plate, so that the water and the silt are prevented from flowing to the air supply pipe 20 through the air inlet hole 34, the problem that the long-term operation of the air curtain sinking well is influenced due to the fact that the air supply pipe 20 is easily blocked in the prior art is solved ingeniously through the design of the flow limiting structure 40, and the structural design is reasonable and ingenious.
The preferred diameter of air inlet hole 34 provided in this embodiment is a 3mm small hole, which is formed by punching a hole at the upper left end of air niche housing 30, and the sealing pad is a rubber pad with a circular radial cross section, and the rubber pad is on the same straight line with the center line of air inlet hole 34, and the diameter of the rubber pad is larger than that of air inlet hole 34. The rubber cushion block has good impact resistance and is suitable for sealing the air inlet hole 34, and the rubber cushion block is soft in texture, compact in structure and good in elastic strength, so that a good sealing effect can be achieved, and elastic fatigue damage to the elastic part 41 can be relieved; the center lines of the rubber cushion block and the air inlet 34 are designed on the same straight line, so that the impact force applied to the rubber cushion block can be balanced and stable, the long-term effect of the application of the flow limiting structure 40 can be kept, and the practicability is better.
Example 4
Example 4 is essentially the same as example 3, except that: referring to fig. 1 and 4, in order to adapt to various fine-grained soil layers, the diameter of the air injection holes 33 on the air niche casing 30 is preferably 0.2-1.5mm, in this embodiment, the diameter of the through holes 11 on the steel open caisson wall plate 10 is 30mm, the diameter of the air injection holes 33 is 1.5mm, the distance between two horizontally adjacent air injection holes 33 is 2.5mm, the air injection holes 33 are distributed in a hexagonal shape as a whole, 8 air injection holes 33 are arranged on the outermost side of the hexagonal shape, the total number of holes is 169, and 169 air injection holes 33 are uniformly distributed on the right vertical side wall of the air niche casing 30, and the distribution range covers the area of the through holes 11 formed on the well wall plate 10. Through a plurality of experiments of an applicant, the diameter of the air injection hole 33 is designed to be 0.2-1.5mm, and the steel open caisson can adapt to various fine-grained soil layers during sinking, so that silt with smaller grains is prevented from entering the air niche shell 30 as much as possible; the gas injection holes 33 are densely arranged along the wall of the steel open caisson, the gas injection holes 33 uniformly distributed on the gas niche shell 30 enable the injected high-pressure gas niche shell 30 to be uniformly diffused, the gas injection holes 33 with the structural design can achieve a better gas injection effect in a short time, and the distribution range of the gas injection holes 33 enables the injected high-pressure gas niche shell 30 to be uniformly diffused and cover the through holes 11 formed in the well wall plate 10, so that the influence caused by installation errors can be effectively reduced, and the gas open caisson has better 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 a steel open caisson, and is also beneficial to further optimization of the application of air curtain assisted sinking measures.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an air curtain air shrine structure that steel open caisson helps heavy usefulness which characterized in that: comprises that
The gas niche shell is fixed on the inner side of the well wall plate of the steel open caisson and corresponds to the through hole formed in the well wall plate;
an air feed pipe for feeding high pressure gas into the niche housing;
the air inlet is formed in the air niche shell and used for communicating the air supply pipe with the air niche shell;
the air inlet is provided with a flow limiting structure for controlling the one-way circulation of the high-pressure gas in the air supply pipe to the air niche shell; and a plurality of air injection holes corresponding to the through holes are formed in the air niche shell.
2. The air curtain air niche structure for assisting in sinking of steel open caisson according to claim 1, wherein: and a screen is arranged on the inner side of the air injection hole and is fixed on the inner wall of the air niche shell.
3. The air curtain air niche structure for assisting in sinking of steel open caisson according to claim 1, wherein: the flow-limiting structure comprises an elastic piece and a sealing cushion block, the sealing cushion block is arranged between the elastic piece and the air inlet hole, the elastic piece is used for enabling the sealing cushion block to compress the air outlet end of the air inlet hole, and the upper surface of the sealing cushion covers the bottom surface of the air inlet hole.
4. The air curtain air niche structure for assisting in sinking of steel open caisson according to claim 3, wherein: the sealing gasket is a rubber cushion block with a circular radial cross section, the rubber cushion block and the central line of the air inlet hole are on the same straight line, and the diameter of the rubber cushion block is larger than that of the air inlet hole.
5. The air curtain air niche structure for assisting in sinking of steel open caisson according to claim 3, wherein: one end of the elastic piece is fixed on the inner wall of the air niche shell, and the sealing cushion block is fixed at the other end of the elastic piece through an air nail.
6. The air curtain air niche structure for assisting in sinking of steel open caisson according to claim 1, wherein: the air supply pipe is arranged at the upper end of the air niche shell and is vertically communicated with the air niche shell.
7. The air curtain air niche structure for assisting in sinking of steel open caisson according to claim 6, wherein: the upper end of the gas niche shell is horizontally arranged, the lower end of the gas niche shell is provided with an inclined section, the inclined section is obliquely downwards arranged along one side close to the wall plate of the steel open caisson, and the gas supply pipe is arranged at the upper end of one side, far away from the wall plate of the steel open caisson, of the gas niche shell.
8. The air curtain air niche structure for assisting in sinking of steel open caisson according to claim 7, wherein: the lower end of the gas niche shell is also provided with a horizontal section, and the inclined section of the gas niche shell is transited to the steel open caisson wall plate through the horizontal section.
9. The air curtain air niche structure for assisting in sinking of steel open caisson according to claim 1, wherein: the gas shrine shell is of a steel structure, and is welded with the steel open caisson wall plate.
10. The air curtain air niche structure for assisting in sinking of steel open caisson according to claim 1, wherein: the diameter of the gas injection holes is 0.2-1.5mm, the gas injection holes are uniformly distributed on the gas niche shell, and the distribution range of the gas injection holes covers through holes formed in a well wall plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921760290.4U CN211621646U (en) | 2019-10-18 | 2019-10-18 | Air curtain air niche structure for assisting sinking of steel open caisson |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921760290.4U CN211621646U (en) | 2019-10-18 | 2019-10-18 | Air curtain air niche structure for assisting sinking of steel open caisson |
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| Publication Number | Publication Date |
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| CN211621646U true CN211621646U (en) | 2020-10-02 |
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| CN201921760290.4U Active CN211621646U (en) | 2019-10-18 | 2019-10-18 | Air curtain air niche structure for assisting sinking of steel open caisson |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110792094A (en) * | 2019-10-18 | 2020-02-14 | 中交二航局第四工程有限公司 | Air curtain air niche structure for assisting sinking of steel open caisson |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110792094A (en) * | 2019-10-18 | 2020-02-14 | 中交二航局第四工程有限公司 | Air curtain air niche structure for assisting sinking of steel open caisson |
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