Telescopic steel casing for underwater cast-in-place pile construction and application structure thereof

Abstract

The telescopic steel casing for underwater cast-in-place pile construction and the application structure of the telescopic steel casing are characterized in that the telescopic steel casing comprises an outer casing and an inner casing, the inner casing is arranged in the outer casing in a sliding mode, the bottom end of the inner casing extends out of the bottom end of the outer casing, and lining pipes are fixed to the outer wall, close to a top opening, of the inner casing and the inner wall, close to a bottom opening, of the outer casing correspondingly; the orthographic projection of the lining pipe on the inner pile casing and the orthographic projection of the lining pipe on the outer pile casing on the horizontal plane are partially overlapped; a circle of first reinforcing ring is arranged on the outer side wall of a top opening of the outer protection cylinder, a plurality of first lifting lugs are evenly arranged on the outer wall of the first reinforcing ring in the circumferential direction at intervals, and the tails of the first lifting lugs are widened. A connecting and fixing assembly is arranged at the bottom of the inner pile casing so that the inner pile casing and the steel pipe pile can be in butt joint and fixed. The cast-in-situ bored pile steel casing has the effect that the height of the cast-in-situ bored pile steel casing meets the construction production requirement at the high water level.

Description

Technical Field

[0001] The present application relates to the technical field of pile foundation construction, and in particular to a telescopic steel casing for underwater bored pile construction and its application structure. Background Art

[0002] In bored pile construction, casing is required to isolate surface water, protect the ground at the hole mouth, fix the pile hole position and guide the drill bit to ensure the smooth progress of bored pile construction.

[0003] Currently, except for special design requirements, steel casing is generally used in accordance with relevant construction technical specifications. However, during construction in deepwater areas, due to the uncertainty of water levels, the water level can rise above the top of the casing after installation, making subsequent construction impossible. Therefore, a retractable temporary steel casing was invented that can maintain the steel casing above the surface even at high water levels and can adapt to water level fluctuations (the retractable casing can adaptively adjust its length as the water level changes), ensuring that the bored pile construction area meets the construction and production needs. Utility Model Content

[0004] In order to ensure that the height of bored pile steel casing meets the construction production requirements when the water level is high.

[0005] The present application provides a telescopic steel casing for underwater bored pile construction and its application structure adopts the following technical solutions:

[0006] In a first aspect, the utility model provides a telescopic steel casing for underwater bored pile construction, comprising an outer casing and an inner casing, wherein the inner casing is slidably arranged within the outer casing, the bottom end of the inner casing extends outward from the bottom end of the outer casing, an inner liner is fixed on the outer wall of the inner casing near the top opening and on the inner wall of the outer casing near the bottom opening, and the orthographic projections of the inner liner on the inner casing and the inner liner on the outer casing on a horizontal plane partially overlap;

[0007] A first reinforcement ring is provided on the outer side wall of the top opening of the outer casing, and a plurality of lifting ears are evenly spaced around the circumferential direction on the outer wall of the first reinforcement ring, and the tail of the lifting ear is widened; a connecting and fixing component is provided at the bottom of the inner casing to facilitate the docking and fixation of the inner casing and the steel pipe pile.

[0008] Preferably, the connection and fixing assembly includes a butt-jointed steel pipe and a second reinforcement ring, the second reinforcement ring is coaxially fixed on the outer wall of the bottom opening of the inner casing, the butt-jointed steel pipe is fixedly sleeved outside the second reinforcement ring, the end of the butt-jointed steel pipe facing away from the outer casing protrudes from the end face of the inner casing, and the end of the butt-jointed steel pipe facing away from the outer casing is arranged in a bell-shaped shape.

[0009] Furthermore, a plurality of lifting ears 2 are evenly spaced around the circumference of the inner casing on the end surface of the second reinforcement ring facing the outer casing.

[0010] Furthermore, two of the first lifting lug and two of the second lifting lug are symmetrically arranged.

[0011] Preferably, round steel rings are provided on the outer walls of both ends of the outer casing, and the two round steel rings are arranged at equal distances from the end faces of both ends of the outer casing.

[0012] Furthermore, the distance between the circular steel ring and the end face of the outer casing is 1m, and the thickness is greater than or equal to 30mm.

[0013] Preferably, the inner casing and the outer casing are clearance-fitted, and the clearance between the inner casing and the outer casing is between 2-5 cm.

[0014] Secondly, the utility model provides an application structure of a telescopic steel casing for underwater bored pile construction, including a telescopic casing and a floating platform. The telescopic casing applies the above-mentioned telescopic steel casing for underwater bored pile construction. The outer casing is hung and fixed on the floating platform through the lifting ear, and the inner casing is connected and fixed to the top of the underwater steel pipe pile through the connecting and fixing assembly.

[0015] Compared with the prior art, the telescopic steel casing for underwater bored pile construction and its application structure of the utility model have the following beneficial technical effects:

[0016] 1. The telescopic steel casing for underwater bored pile construction of the present invention is configured as a telescopic cylinder, and the length of the steel casing can be adjusted in real time according to changes in the water level, thereby ensuring that the steel casing is always at a height above the water surface, thereby ensuring the normal progress of bored pile construction operations.

[0017] 2. When the present invention is used, the appropriate length of the temporary telescopic steel casing is selected according to the height between the highest water level and the top elevation of the steel pipe pile and the height between the lowest water level and the top elevation of the steel pipe pile, to ensure that the steel casing does not extend more than 2m above the water surface after being shortened at low water level, and can still extend 0.5m or more above the water surface after being extended at the highest water level; when the water level difference between the highest water level and the lowest water level is too large (e.g., more than 10m), long and short casings can be made respectively according to the flood season (high water level period) and the dry season (high water level period) to meet the construction needs of bored piles in high water level period and low water level period respectively; before installing the steel casing, the depth between the water surface and the top of the steel casing needs to be measured (or calculated), and the telescopic steel casing of appropriate length should be selected for installation to ensure that the inner steel casing is located on the top of the steel pipe pile and does not extend more than 2m above the water surface (extending too high above the water surface is inconvenient for bored pile construction).

[0018] 3. When the utility model is used, the telescopic steel casing is lifted, and the position of the designed steel casing is found according to the measurement and positioning, and the telescopic steel casing is slowly lowered. Since the telescopic steel casing is provided with a connecting and fixing component and a bell mouth is provided at the docking point, the precision required for docking can be reduced, and it is easier to dock the telescopic steel casing with the designed steel casing; after the inner steel casing is docked with the steel pipe pile, since the docking steel pipe has a 0.5m long connection (limiting) section, it can avoid the installation interface from being misplaced or the inner casing from moving during the cast-in-place pile construction process, thereby ensuring the quality of the docking between the inner steel casing and the steel pipe pile.

[0019] 4. When the utility model is used, after the inner steel casing is connected, the outer steel casing is hung on the working platform hung on the floating platform by using the hanging ear on the top of the outer steel casing, and the lifting wire rope is fixed on the working platform.

[0020] 5. After the installation is completed, since the top of the outer casing of the telescopic steel casing has been suspended and fixed to the working platform, the inner casing is inserted into the top of the steel pipe pile by its own weight, and the docking steel pipe can prevent the inner casing from being dislocated or moved with the steel pipe pile. Due to the retractability of the steel casing, it can automatically adapt to subsequent changes in water level; after the construction of the bored pile is completed, the telescopic steel casing can be lifted from the top of the steel pipe pile by lifting the steel casing lifting wire rope hung on the working platform with a crane, completing the removal of the telescopic steel casing. The telescopic steel casing can be recycled for the construction of other bored piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic cross-sectional view of a telescopic steel casing for underwater bored pile construction according to the present invention;

[0022] Figure 2 This is a schematic diagram of the telescopic casing hoisting of the application structure of a telescopic steel casing for underwater bored pile construction in the utility model;

[0023] Figure 3 This is a diagram of the docking and fixing structure of the telescopic steel casing and the designed steel casing in the application structure of the telescopic steel casing for underwater cast-in-place pile construction of the utility model;

[0024] Figure 4 This is a schematic structural diagram of the application structure of a telescopic steel casing for underwater bored pile construction of the utility model when the inner casing and the outer casing of the telescopic casing are disconnected;

[0025] Figure 5 The utility model discloses a telescopic steel casing for underwater bored pile construction, and shows a working principle diagram of the telescopic casing when the water level rises.

[0026] Figure numerals: 1. telescopic casing; 11. outer casing; 12. inner casing; 2. inner liner; 3. first reinforcement ring; 4. lifting lug 1; 5. connection and fixing assembly; 51. docking steel pipe; 52. second reinforcement ring; 6. lifting lug 2; 7. round steel ring; 8. floating platform. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings understood by persons having ordinary skills in the field to which this application belongs. The words "a" or "an" and the like used in the patent application specification and claims of this application do not indicate a limitation on quantity, but rather indicate the presence of at least one.

[0029] The following is combined with Figure 1-5 This application is described in further detail.

[0030] The embodiment of the present application discloses a telescopic steel casing for underwater bored pile construction.

[0031] Reference Figure 1-Figure 5 A telescopic steel casing for underwater bored pile construction includes an outer casing 11 and an inner casing 12. The inner casing 12 is slidably inserted in the outer casing 11, and the bottom end of the inner casing 12 extends out of the bottom end of the outer casing 11. The inner and outer diameters are consistent with the designed outer diameter of the steel casing. The lengths of the outer casing 11 and the inner casing 12 are based on the water level changes at the construction site and the designed steel casing top elevation. The length of a single casing is approximately half of the total extended length. In this embodiment, the longest lengths of the outer casing 11 and the inner casing 12 are preferably 8m and 15m, and the telescopic range can be adjusted according to actual production needs.

[0032] In a further embodiment, in order to control the telescopic range of the steel casing and prevent the water level from exceeding the telescopic range of the steel casing, resulting in the separation of the inner casing 12 and the outer casing 11, inner lining pipes 2 are welded and fixed on the outer wall of the inner casing 12 near the top and the inner wall of the outer casing 11 near the bottom. The inner lining pipe 2 on the inner casing 12 and the inner lining pipe 2 on the outer casing 11 partially overlap in their orthographic projections on the horizontal plane. In the initial state, the two inner lining pipes 2 of the 8m and 15m telescopic steel casings are 4m and 7.5m respectively. When the telescopic steel casing is hoisted, the inner casing 12 will fall to the extreme position due to its own weight, and the upper and lower layers of the inner lining pipes 2 will be close to each other, and the telescopic steel casing reaches its maximum length.

[0033] Furthermore, the inner casing 12 and the outer casing 11 are clearance-matched, which facilitates flexible movement. The clearance between the inner casing 12 and the outer casing 11 is between 2-5 cm.

[0034] Reference Figure 1 In a further embodiment, a first reinforcement ring 3 is coaxially welded and fixed on the outer side wall of the top of the outer casing 11, and a plurality of lifting ears 4 are welded and fixed on the outer wall of the first reinforcement ring 3 at uniform intervals in the circumferential direction. In this embodiment, two lifting ears 4 are preferably installed symmetrically, and the tail of the lifting ear 4 is widened so that the lifting ear 4 is "L"-shaped as a whole to fix the position of the outer casing 11; a connecting and fixing component 5 is installed at the bottom of the inner casing 12 to facilitate the docking and fixation of the inner casing 12 and the steel pipe pile.

[0035] Furthermore, the connection and fixing assembly 5 includes a butt-jointed steel pipe 51 and a second reinforcement ring 52. The second reinforcement ring 52 is coaxially welded and fixed on the outer wall of the bottom of the inner casing 12. The butt-jointed steel pipe 51 is fixedly sleeved outside the second reinforcement ring 52 and welded and fixed. The end of the butt-jointed steel pipe 51 facing away from the outer casing 11 protrudes from the end face of the inner casing 12. The end of the butt-jointed steel pipe 51 facing away from the outer casing 11 is in a bell-mouthed shape to facilitate the butt-jointing of the telescopic steel casing with the designed steel casing.

[0036] Furthermore, a plurality of lifting ears 2 6 are evenly spaced around the circumferential direction of the inner casing 12 on the end surface of the second reinforcement ring 52 facing the outer casing 11. In this embodiment, two lifting ears 2 6 are preferably symmetrically arranged. In order to adapt to the situation where the water surface is shorter than the top position of the designed steel casing, it is not necessary to extend the steel casing to the maximum length. A steel plate lifting ear 2 6 is welded at a symmetrical position at the intersection of the bottom of the inner casing 12 and the connecting and fixing assembly 5. Before the steel casing is hoisted, a steel wire rope is used to connect the lifting ear 2 6 to the lifting ear 1 4 at the top of the outer casing 11 to prevent the inner casing 12 from falling.

[0037] Reference Figure 1 In a further embodiment, round steel rings 7 are welded and fixed on the outer walls of both ends of the outer casing 11. The two round steel rings 7 are arranged at equal intervals from the end faces of the outer casing 11. Specifically, the distance between the round steel ring 7 and the end face of the outer casing 11 is 1m, and the thickness is greater than or equal to 30mm. It is used to connect the guy rope when hoisting the telescopic steel casing to stabilize the telescopic steel casing.

[0038] Reference Figure 2-Figure 5 This embodiment also discloses an application structure of a telescopic steel casing for underwater bored pile construction, including a telescopic casing 1 and a floating platform 8. The telescopic casing 1 applies the above-mentioned telescopic steel casing for underwater bored pile construction. The floating platform 8 is fixedly connected to the top wall of the outer casing 11. Due to the retractability of the steel casing, it can automatically adapt to subsequent changes in water level.

[0039] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A telescopic steel casing for underwater bored pile construction, characterized in that: It comprises an outer casing (11) and an inner casing (12), wherein the inner casing (12) is slidably arranged in the outer casing (11), the bottom end of the inner casing (12) extends out of the bottom end of the outer casing (11), an inner lining pipe (2) is fixed on the outer wall of the inner casing (12) near the top opening and the inner wall of the outer casing (11) near the bottom opening, and the orthographic projections of the inner lining pipe (2) on the inner casing (12) and the inner lining pipe (2) on the outer casing (11) on the horizontal plane partially overlap; A first reinforcement ring (3) is provided on the outer side wall of the top opening of the outer casing (11), and a plurality of lifting lugs (4) are evenly spaced around the circumference on the outer wall of the first reinforcement ring (3), and the tail of the lifting lugs (4) is widened; a connecting and fixing assembly (5) is provided at the bottom of the inner casing (12) to facilitate the docking and fixing of the inner casing (12) and the steel pipe pile.

2. The telescopic steel casing for underwater bored pile construction according to claim 1, characterized in that: The connecting and fixing assembly (5) comprises a butt-jointed steel pipe (51) and a second reinforcing ring (52), wherein the second reinforcing ring (52) is coaxially fixed to the outer wall of the bottom opening of the inner casing (12), and the butt-jointed steel pipe (51) is fixedly sleeved outside the second reinforcing ring (52), and the end of the butt-jointed steel pipe (51) facing away from the outer casing (11) protrudes from the end face of the inner casing (12), and the end of the butt-jointed steel pipe (51) facing away from the outer casing (11) is arranged in a bell-shaped manner.

3. The telescopic steel casing for underwater bored pile construction according to claim 2, characterized in that: A plurality of lifting ears (6) are evenly spaced around the circumference of the inner casing (12) on an end surface of the second reinforcement ring (52) facing the outer casing (11).

4. The telescopic steel casing for underwater bored pile construction according to claim 3, characterized in that: There are two of the first lifting lug (4) and the second lifting lug (6) symmetrically arranged.

5. The telescopic steel casing for underwater bored pile construction according to claim 1, characterized in that: Circular steel rings (7) are provided on the outer walls of both ends of the outer casing (11), and the two circular steel rings (7) are arranged at equal intervals from the end faces of both ends of the outer casing (11).

6. The telescopic steel casing for underwater bored pile construction according to claim 5, characterized in that: The distance between the circular steel ring (7) and the end face of the outer casing (11) is 1 m, and the thickness is greater than or equal to 30 mm.

7. The telescopic steel casing for underwater bored pile construction according to claim 1, characterized in that: The inner casing (12) and the outer casing (11) are clearance-matched, and the clearance between the inner casing (12) and the outer casing (11) is between 2-5 cm.

8. An application structure of a telescopic steel casing for underwater bored pile construction, comprising a telescopic casing (1) and a floating platform (8), characterized in that: The telescopic casing (1) is a telescopic steel casing for underwater bored pile construction as described in any one of claims 1 to 6, the outer casing is hung and fixed on the floating platform (8) through the lifting lug (4), and the inner casing (12) is connected and fixed to the top of the underwater steel pipe pile through the connecting and fixing assembly (5).

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