Self-adaptive steel buttress blocking construction method for blade foot of large steel open caisson

Abstract

The invention discloses a blocking construction method for a blade foot self-adaptive steel buttress of a large steel open caisson. The blocking construction method for the blade foot self-adaptive steel buttress of the large steel open caisson comprises the steps that the blade foot disengaging position of the steel open caisson is determined; a plurality of mounting holes are formed in the bottom of the inner blade foot at the blade foot disengagement position along the circumferential direction at equal intervals; lowering at least one blade foot steel buttress to an underwater designated position; a positioning hole in a positioning plate at the top of the blade foot steel buttress is aligned with the formed mounting hole, and a blade foot steel supporting leg is rapidly and temporarily fixed through a bolt; the blade foot steel buttress and the blade foot steel plate are welded and fixed; an exhaust hole is formed in the upper end of the inner cylinder body, and a concrete inlet hole is formed in the bottom or the side wall of the inner cylinder body; the positioning connection between the outer sleeve and the inner barrel is relieved, and the outer sleeve falls under the action of gravity and makes contact with the seabed rock surface to form a closed shielding structure; and the step of lowering the blade foot steel buttresses until the positioning connection is removed is repeatedly executed, the multiple blade foot steel buttresses are installed in the corresponding installation hole positions of the steel open caisson blade foot disengaging positions in a one-to-one correspondence mode, and disengaging plugging is completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of offshore construction operation, in particular to a large steel caisson blade foot self-adaptive steel support pier plugging construction method. BACKGROUND

[0002] After the sinking of the caisson, according to the underwater sonar scanning results and the divers' underwater exploration, it is generally found that the caisson blade foot will have a void phenomenon, especially the inner blade foot, and there are blasting rubble, sediment silt, caisson debris and other things in the foundation trench, and the void condition will be more prominent after the debris is cleaned. The blade foot void will lead to the failure to meet the construction conditions of the bottom sealing concrete partition pouring, and the next step of the bottom sealing construction cannot be carried out normally. SUMMARY

[0003] In view of the above-mentioned deficiencies, one object of the present application is to provide a large steel caisson blade foot self-adaptive steel support pier plugging construction method, which uses a telescopic steel support pier with a height that can be self-adaptive to the seabed topography, can meet the installation requirements before the debris is cleaned, and can ensure the plugging effect of the blade foot void after the debris is sucked, improve the pouring quality of the concrete bottom sealing construction, and has less construction procedures, high efficiency, so that the caisson bottom sealing construction can be carried out quickly after the debris cleaning is completed.

[0004] In order to achieve the above-mentioned object, the present application adopts the following technical scheme: A large steel caisson blade foot self-adaptive steel support pier plugging construction method, the blade foot steel support pier comprises an inner cylinder, an outer sleeve telescopically sleeved on the outer of the inner cylinder; the lower end of the outer sleeve is open; the upper and lower ends of the inner cylinder are closed by steel plates; a plurality of limiting guide grooves extending along the length direction are arranged on the outer wall of the outer sleeve in the circumferential direction; a guide plate embedded in the limiting guide groove is arranged on the outer wall of the inner cylinder; the upper end of the inner cylinder is located outside the upper end of the outer sleeve, and a positioning plate is arranged on the upper end face of the inner cylinder; a positioning hole is arranged on the positioning plate; the outer sleeve is positioned and connected at the uppermost position of the inner cylinder, and the positioning connection can be released; The large steel caisson blade foot self-adaptive steel support pier plugging construction method comprises the following steps: Determine the blade foot void position of the steel caisson; A plurality of installation holes are equidistantly arranged on the inner blade foot bottom in the circumferential direction at the blade foot void position; At least one blade foot steel support pier is lowered to a specified position underwater; The positioning hole on the positioning plate at the top of the blade foot steel support pier is aligned with the installation hole, and the blade foot steel support leg is temporarily fixed by bolts; The blade foot steel support pier is welded and fixed with the blade foot steel plate; An exhaust hole is arranged at the upper end of the inner cylinder, and a concrete inlet hole is arranged at the bottom or sidewall of the inner cylinder; The outer sleeve is released from the positioning connection with the inner cylinder, and the outer sleeve falls under the action of gravity and contacts the seabed rock surface to form a closed shielding structure. The steps of lowering the blade foot steel support pier to release the positioning connection are repeatedly performed to install a plurality of blade foot steel support piers one by one into the corresponding installation hole positions of the steel caisson blade foot void position, and the void plugging is completed.

[0005] Preferably, the diver first explores the steel caisson shaft chamfer underwater, descends along the shaft wall to the blade foot, and explores the blade foot clockwise or counterclockwise to determine the steel caisson blade foot void position.

[0006] Preferably, the inner blade foot has a gusset plate position, the circumferential distance between two adjacent gusset plates is L, the outer diameter of the outer sleeve is D, the number of blade foot steel support piers installed between two gusset plates is [L / D], and a single-hole positioning fixture is used to open an installation hole between the two gusset plates. When the inner blade foot does not have a gusset plate position, a double-hole positioning fixture is used to open holes one by one.

[0007] Preferably, the inner blade foot has a gusset plate position, the circumferential distance between two adjacent gusset plates is 65-70 cm, a single-hole positioning fixture is used to open an installation hole between the two gusset plates, and when the inner blade foot does not have a gusset plate position, a double-hole positioning fixture is used to open holes one by one, and the hole distance of the double-hole positioning fixture is 65-70 cm.

[0008] Preferably, an exhaust hole is opened at a position 3 cm from the top of the blade foot steel support pier.

[0009] Preferably, a circular concrete hole with a diameter of 10-20 cm is opened at the bottom of the inner cylinder, or a long-hole structure concrete hole is machined on the cylinder wall of the inner cylinder through the limiting guide groove; the length of the long-hole structure concrete hole is 30-60 cm.

[0010] Preferably, the upper end of the outer sleeve has an outwardly protruding lower positioning rod; the mounting plate is also provided with a hanging hole; the outer sleeve is connected with the lower positioning rod and the hanging hole through a wire to temporarily positionally connect the outer sleeve with the inner cylinder. The wire is removed to release the positioning connection between the outer sleeve and the inner cylinder.

[0011] Preferably, the inner cylinder and the outer sleeve are both made of Q235 steel pipes with a wall thickness of 7-10 mm; the outer diameter of the inner cylinder is 25-30 cm; the outer diameter of the outer sleeve is 300-35 cm; when the outer sleeve is positioned and connected at the uppermost position of the inner cylinder, the length of the steel support pier is 1.5-2 m.

[0012] Preferably, the method further comprises the step of: piling sand bags outside the blade foot steel support to form lateral support for the blade foot steel support.

[0013] Preferably, the positioning hole is a round hole or a waist-shaped hole.

[0014] Preferably, the distance between the two adjacent steel supports is less than 3 cm. Advantages

[0015] The large steel caisson blade foot self-adaptive steel support plugging construction method provided by the application adopts telescopic steel supports with self-adaptive height to the seabed topography, which can meet the installation requirements before the debris is removed and ensure the plugging effect of the blade foot void after the debris is removed, improve the concrete bottom sealing construction pouring quality, and has less construction procedures, high efficiency, and enables the caisson bottom sealing construction to be rapidly performed after the debris removal is completed.

[0016] Specific embodiments of the application are disclosed below with reference to the drawings, which show, by way of example, the principles of the application. It should be understood that the embodiments of the application are not limited to the principles of the application.

[0017] Features described and / or illustrated with respect to one implementation can be used in one or more other implementations in the same or similar manner, in combination with or in place of features in other implementations.

[0018] It should be emphasized that the term "comprises / comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 is a large steel caisson blade foot exploration position schematic diagram of the construction method of the application; Figure 2 is Figure 1 a blade foot structure schematic diagram; Figure 3 is a steel support installation schematic diagram of the construction method of the application; Figure 4 is a steel support actual product diagram of one embodiment of the application; Figure 5 is a steel support welding and reinforcing schematic diagram of the construction method of the application; Figure 6 is a multi-step schematic diagram of the water injection hole opening method of the construction method of the present application; Figure 7 is a schematic diagram of the steel support pier extension effect of the construction method of the present application; Figure 8 is Figure 7 a schematic diagram of the contact with the seabed rock surface and the shielding and void effect; Figure 9 is a front view of a single-hole positioning fixture provided by an embodiment of the present application; Figure 10 is Figure 9 a sectional view. DETAILED DESCRIPTION

[0021] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0022] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0024] Referring to Figures 1 to 8 , an embodiment of the present application provides a large steel caisson blade foot self-adaptive steel support pier plugging construction method.

[0025] The blade foot steel support pier 5 comprises an inner cylinder 10, an outer sleeve 20 slidably sleeved outside the inner cylinder 10, an opening at the lower end of the outer sleeve 20, the upper and lower ends of the inner cylinder 10 being closed by steel plates, a plurality of limiting guide grooves 25 extending along the length direction of the outer wall of the outer sleeve 20 being arranged on the outer wall of the outer sleeve 20 in a circumferential direction, a guide plate 21 being arranged on the outer wall of the inner cylinder 10 and embedded in the limiting guide grooves 25, the upper end of the inner cylinder 10 being located outside the upper end of the outer sleeve 20, a positioning plate 11 being arranged on the upper end face of the inner cylinder 10, positioning holes 14 being arranged on the positioning plate 11, and the outer sleeve 20 being positioned and connected at the uppermost position of the inner cylinder 10, and the positioning and connection can be released. The inner cylinder 10 and the outer sleeve 20 are both made of Q235 steel pipes, the thickness of the pipe wall is 7mm to 10mm, the outer diameter of the inner cylinder 10 is 25cm to 30cm, the outer diameter of the outer sleeve 20 is 300cm to 35cm, and the length of the steel support pier 5 is 1.5m to 2m when the outer sleeve 20 is positioned and connected at the uppermost position of the inner cylinder 10. The inner cylinder 10 is a closed cylinder, which provides buoyancy to overcome the gravity of the water and facilitates manual operation in the sea.

[0026] The large steel caisson blade foot self-adaptive steel support pier plugging construction method comprises the following steps: S100, determining the void position of the steel caisson blade foot 500; S200, equidistantly opening a plurality of mounting holes 501 on the inner blade foot 500 at the bottom of the void position of the blade foot 500 in a circumferential direction; S300, lowering at least one blade foot steel support pier 5 to a specified position underwater; specifically, the same number of blade foot steel support piers as the mounting holes 501 are lowered, and the spacing between two adjacent steel support piers 5 is less than 3cm.

[0027] S400, aligning the positioning holes 14 on the positioning plate 11 at the top of the blade foot steel support pier 5 with the mounting holes 501, and temporarily fixing the blade foot 500 steel support leg with bolts; the positioning holes 14 are round holes or waist-shaped holes, and the waist-shaped holes are preferred.

[0028] S500, welding and fixing the blade foot steel support pier 5 and the blade foot 500 steel plate; S600, opening an exhaust hole 15 at the upper end of the inner cylinder 10 and a concrete inlet hole 18 at the bottom or sidewall of the inner cylinder 10; S700, releasing the positioning and connection of the outer sleeve 20 and the inner cylinder 10, and the outer sleeve 20 falls under the action of gravity and contacts the seabed rock surface to form a closed shielding structure; S800, repeatedly performing the step of lowering the blade foot steel support pier 5 to release the positioning and connection, and installing a plurality of blade foot steel support piers 5 one by one into the corresponding mounting hole 501 positions at the void position of the steel caisson blade foot 500 to complete the void plugging, and the effect is as follows:Figure 8 as shown.

[0029] In step S100, the diver first touches the steel caisson shaft chamfer under water, descends to the blade foot 500 along the shaft wall, and touches the blade foot 500 clockwise or counterclockwise. The position of the blade foot 500 is shown in the figure, and the position of the steel caisson blade foot 500 is determined. Specifically, the diver first touches the shaft chamfer on the water surface or about 5m under water, descends to the blade foot along the shaft wall, and touches the blade foot clockwise or counterclockwise. The diver reports the touch position and the voiding condition to the personnel on the platform in real time through the underwater communication system. Figure 1

[0030] After determining the position of the steel caisson blade foot 500, the blade foot is drilled, that is, step S200.

[0031] Specifically, the inner blade foot 500 has a gusset plate 506 position, the circumferential distance between the two adjacent gusset plates 506 is L, the outer diameter of the outer sleeve 20 is D, the number of blade foot steel piers 5 installed between the two gusset plates 506 is [L / D], and a single-hole positioning fixture can be used to drill mounting holes 506 between the two gusset plates 506. In another embodiment, the inner blade foot 500 does not have a gusset plate position, and a double-hole positioning fixture is used to drill mounting holes 506 one by one.

[0032] In this embodiment, the inner blade foot 500 has a gusset plate 506 position, the circumferential distance between the two adjacent gusset plates 506 is 65-70cm, and a single-hole positioning fixture is used to drill mounting holes 506 between the two gusset plates 506. The structure of the single-hole positioning fixture is shown in the figure. Figure 6 Figure 7 The single-hole positioning fixture has a main plate 50, a positioning bolt 54 fixedly connected to the lower end of the main plate, and a connecting plate 52 vertically connected to the main plate 50. The connecting plate 50 is fixed with a nut 53, the positioning bolt 54 is screwed into the nut 53, and the blade foot (plate) can be clamped by rotating the positioning bolt 54, so that the single-hole positioning fixture is fixed between the two gusset plates 506. The positioning hole 51 on the single-hole positioning fixture shows the mounting hole 506, and drilling into the positioning hole 51 can When the inner blade foot 500 does not have a gusset plate 506 position, a double-hole positioning fixture is used to drill mounting holes 506 one by one. The hole distance of the double-hole positioning fixture is 65-70cm. Preferably, a single mounting hole 506 is provided between the two adjacent gusset plates 506, and a blade foot 500 pier is provided correspondingly. The double-hole positioning fixture can position one hole to drill the other hole. The double-hole positioning fixture can refer to the single-hole positioning fixture, and two positioning holes are provided on the double-hole positioning fixture. One of the two positioning holes is aligned with a positioning hole, and the other positioning hole is drilled.

[0033] ​​The steel support 5 is installed at the inner blade foot 500 by divers, and the process can be performed before the base trench cleaning process to remove most of the steel support 5 at the blade foot 500. The upper end of the positioning plate 11 is also connected to the lifting plate 13, and the upper end of the lifting plate 13 is provided with a lifting hole 131. Three or four blade foot steel supports 5 are lowered at one time by using a steel wire rope. The edges of the positioning plate 11 and the lifting plate 13 are welded to the blade foot 500 steel plate.

[0034] In combination with the results of sonar scanning, multi-beam and diver exploration, a certain specification of steel support 5 is selected, hoisted to the hoist frame, and then directly lowered to the seabed by using a small-scale marine crane. According to the diving work efficiency, four can be connected and installed at one time.

[0035] In the bolt connection and temporary fixing step S400, the diver carries the entire telescopic steel support 5 to the bottom of the inner blade foot, first uses the positioning plate 11 (positioning steel plate) at the top of the steel support 5 to be clamped at the blade foot plate 506, then straddles on the steel support 5, overcomes the shaking caused by the buoyancy of the inner cylinder 10 (inner shell), slowly moves the steel support 5, until the hole position of the positioning plate 11 is aligned with the pre-drilled hole position (mounting hole) of the blade foot, and then quickly fixes the steel support with bolts. Then step S500 is performed, as shown in Figure 5 The diver uses an inverter DC arc welding machine to weld the steel support positioning plate 11 and the blade foot steel plate to form a convex-shaped weld 115.

[0036] As shown in Figure 6 In step S600, an exhaust hole 15 is provided at a position 3 cm from the top of the blade foot steel support 5. A circular concrete hole 18 with a diameter of 10-20 cm is provided at the bottom of the inner cylinder 10, or a long-hole structure concrete hole 19 is machined on the wall of the inner cylinder 10 through the limiting guide groove 25. The length of the long-hole structure concrete hole 19 is 30-60 cm.

[0037] Specifically, the diver uses an underwater cutting torch to cut an exhaust hole 15 at a position 3 cm from the top of the steel support 5, so that air can be discharged, and then cuts a circular hole (concrete hole 18) with a diameter of 15 cm at the bottom of the inner cylinder 10 of the steel support 5, which facilitates the entry of post-sealing concrete into the steel support. If there is no opening condition for the bottom circular hole, a 50 cm long slot (long-hole structure concrete hole 19) is provided on the side wall of the inner shell.

[0038] In this embodiment, asFigure 3 、 Figure 4 As shown in FIG. 7, the upper end of the outer sleeve 20 has a lower positioning rod protruding outward. The mounting plate is also provided with a hanging hole; the outer sleeve 20 is connected with the lower positioning rod and the hanging hole through the iron wire 17, and the outer sleeve 20 is temporarily positioned and connected with the inner cylinder 10. Therefore, in the S700 of the specific construction process, the positioning connection between the outer sleeve 20 and the inner cylinder 10 is released by removing the iron wire 17. The diver releases the temporarily positioned iron wire 17, and the sleeve shell freely falls and contacts the seabed rock surface to form a closed shielding structure, thereby achieving the effect of plugging the concrete.

[0039] The large steel caisson blade foot self-adaptive steel support pier plugging construction method further comprises the step of: piling up sandbags outside the blade foot steel support pier 5 to form lateral support for the blade foot steel support pier 5.

[0040] When the bottom sealing concrete is poured, the lateral pressure on the steel support pier 5 is large, so that the deformation of the steel support pier 5 is prevented by piling up sandbags outside the bottom of the steel support pier 5 and the small shaft to form counterpressure and prevent the concrete from overflowing. The sandbags are not combined and not consolidated, the diver places the sandbags at the bottom of the steel support pier 5, and each layer is staggered and stacked when paving, the paving direction is perpendicular between each layer, the overlap between the sandbags is not less than 30-40 cm, and the paving height is more than 1 m, so as to ensure that sufficient lateral support is provided for the steel support pier.

[0041] It should be noted that any numerical value cited herein includes all values from the lower value to the upper value in increments of one unit, and there are at least two units of interval between any lower value and any higher value. For example, if it is stated that the value of a component quantity or process variable (such as temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to state that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. are also explicitly listed in the specification. For values less than 1, it is appropriate to consider that one unit is 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly stated in the specification, and all possible combinations of values listed between the lowest value and the highest value are considered to be explicitly stated in a similar manner.

[0042] Unless otherwise stated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" as applied to any numerical value means that the value is within 10% of the value stated. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including the stated endpoints.

[0043] In this embodiment, multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into separate multiple elements, components, parts, or steps. The disclosure of "a" or "one" to describe an element, component, part, or step does not exclude other elements, components, parts, or steps.

[0044] It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the technology should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for the purpose of the present disclosure. The omission of any aspect of the subject matter disclosed herein does not preclude coverage of such aspect, nor does it shed light on whether the subject matter is considered to be part of the prior art.

Claims

1. A method for sealing large steel caissons with self-adaptive steel supports, characterized in that, The cutting edge steel support includes an inner cylinder and an outer sleeve slidably fitted onto the inner cylinder; the lower end of the outer sleeve is open; the upper and lower ends of the inner cylinder are both closed by steel plates; the outer wall of the outer sleeve is provided with a plurality of limiting guide grooves extending along its length in the circumferential direction; the outer wall of the inner cylinder is provided with a guide plate embedded in the limiting guide grooves; the upper end of the inner cylinder is located outside the upper end of the outer sleeve, and a positioning plate is provided on the upper end face of the inner cylinder; the positioning plate is provided with positioning holes; the outer sleeve is positioned and connected to the uppermost position of the inner cylinder, and this positioning connection can be released; The construction method for sealing the cutting edge of a large steel caisson with adaptive steel supports includes: Determine the location where the cutting edge of the steel caisson is detached; Multiple mounting holes are equidistantly opened at the bottom of the inner cutting edge at the circumferential direction in the position where the cutting edge is detached; Lower at least one cutting edge steel support to the designated underwater position; Align the positioning holes on the positioning plate at the top of the cutting edge steel support with the installed holes, and quickly and temporarily fix the cutting edge steel support leg with bolts. Weld and fix the cutting edge steel support to the cutting edge steel plate; An exhaust hole is made at the upper end of the inner cylinder, and a concrete inlet hole is made at the bottom or side wall of the inner cylinder. The positioning connection between the outer sleeve and the inner cylinder is released, and the outer sleeve falls under the action of gravity, forming a closed shielding structure in contact with the seabed rock surface. Repeat the step of lowering the cutting edge steel support until the positioning connection is released, and install multiple cutting edge steel supports one by one into the corresponding mounting holes of the steel caisson cutting edge detachment position to complete the detachment and sealing.

2. The construction method for sealing large steel caisson cutting edge adaptive steel support piers as described in claim 1, characterized in that, Divers first locate the chamfer of the steel caisson shaft underwater, then descend along the shaft wall to the cutting edge, probing the cutting edge clockwise or counterclockwise to determine the location where the steel caisson cutting edge is detached.

3. The construction method for sealing large steel caisson cutting edge adaptive steel support piers as described in claim 1, characterized in that, At the location of the inner cutting foot with a stiffening plate, the circumferential distance between two adjacent stiffening plates is L, and the outer diameter of the outer sleeve is D; the number of cutting foot steel supports installed between the two stiffening plates is [L / D]; a single-hole positioning clamp is used to open an installation hole between the two stiffening plates; Where the inner cutting edge does not have a stiffening plate, a double-hole positioning fixture is used to make holes one by one.

4. The construction method for sealing large steel caisson cutting edge adaptive steel support piers as described in claim 1, characterized in that, An exhaust hole is made at a position 3cm from the top of the steel support foot.

5. The construction method for sealing large steel caisson cutting edge adaptive steel support piers as described in claim 1, characterized in that, A circular concrete inlet hole with a diameter of 10-20cm is opened at the bottom of the inner cylinder, or a long hole structure concrete inlet hole is machined on the cylinder wall of the inner cylinder through the limiting guide groove; the length of the long hole structure concrete inlet hole is 30cm to 60cm.

6. The construction method for sealing large steel caisson cutting edge adaptive steel support piers as described in claim 1, characterized in that, The upper end of the outer sleeve has an outwardly protruding lower positioning rod; the mounting plate is also provided with a hanging hole; the outer sleeve is connected to the lower positioning rod and the hanging hole by an iron wire, which temporarily limits the connection between the outer sleeve and the inner cylinder. Remove the wire to release the positioning connection between the outer sleeve and the inner sleeve.

7. The construction method for sealing large steel caisson cutting edge adaptive steel support piers as described in claim 1, characterized in that, Both the inner cylinder and the outer sleeve are made of Q235 steel pipe with a wall thickness of 7mm to 10mm; the outer diameter of the inner cylinder is 25 to 30cm; the outer diameter of the outer sleeve is 300cm to 35cm; when the outer sleeve is positioned at the top of the inner cylinder, the length of the steel support is 1.5m to 2m.

8. The construction method for sealing large steel caisson cutting edge adaptive steel support piers as described in claim 1, characterized in that, It also includes the step of stacking sandbags on the outside of the cutting edge steel support to provide lateral support to the cutting edge steel support.

9. The method for sealing large steel caisson cutting edge adaptive steel support piers as described in claim 1, characterized in that, The positioning hole is a round hole or an oblong hole.

10. The method for sealing large steel caisson cutting edge adaptive steel support piers as described in claim 1, characterized in that, The distance between two adjacent steel supports is less than 3cm.

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