An auxiliary device for removing steel casings during bridge pile foundation construction.

Abstract

This application relates to the technical field of steel casing removal, and discloses an auxiliary device for removing steel casings during bridge pile foundation construction. The device includes: a steel support frame; jacks spaced apart on the steel support frame; a lifting rod installed on the jacks; a positioning block fixedly welded to the outer wall of the steel casing, with the lifting rod passing through the positioning block; two push blocks detachably installed on both ends of the lifting rod, one push block contacting the lower surface of the positioning block, and the other push block contacting the piston end of the jacks; multiple jacks are divided into two groups, and the two groups of jacks are activated alternately. This application significantly simplifies the connection process and enables more uniform circumferential force distribution on the steel casing.

Description

Technical Field

[0001] This application relates to the technical field of steel casing removal, and in particular to an auxiliary device for steel casing removal in bridge pile foundation construction. Background Technology

[0002] In bridge construction, steel casings are widely used in offshore bridge pile foundation construction, mainly to prevent borehole collapse, isolate seawater seepage, and guide and position the piles. Offshore pile foundation steel casings are typically quite long, approximately 20-30 meters.

[0003] When encountering sloping rock formations or geological conditions with varying hardness, displacement can easily occur, necessitating the removal of the steel casing. If the casing is severely deformed, it must be evenly stressed to prevent further damage. The removal method involves: erecting a temporary steel support frame around the casing; evenly distributing multiple hydraulic jacks between the reaction frame and the top of the casing; connecting the jacks to the casing via steel cables; and welding connecting rings to the casing at intervals for securing the casing to the steel cables. The jacks are then used to slowly push (or pull) the casing upwards, gradually raising it.

[0004] The casing is continuously pulled upwards, and the steel cables are successively tied and untied to multiple connecting rings along the axial direction of the steel casing. The steel casing also has multiple connecting rings along its circumference, which are connected to multiple jacks via steel cables. The connection method is quite complicated. Utility Model Content

[0005] To simplify the connection method, this application provides an auxiliary device for removing steel casings during bridge pile foundation construction.

[0006] This application provides an auxiliary device for removing steel casings during bridge pile foundation construction, employing the following technical solution: An auxiliary device for removing steel casings during bridge pile foundation construction includes: Steel support frame; Jacks are spaced apart on the steel frame; The lifting rod is installed on the jack; A positioning block is fixedly welded to the outer wall of the steel casing, and the lifting rod passes through the positioning block; Two push blocks are detachably installed on both ends of the lifting rod. One push block is in contact with the lower surface of the positioning block, and the other push block is in contact with the piston end of the jack. The multiple jacks are divided into two groups, and the two groups of jacks are started alternately.

[0007] By adopting the above technical solution, during installation, it is only necessary to pass the lifting rod through the positioning block and then install push blocks at both ends of the lifting rod to complete the connection between the device and the steel casing, which greatly simplifies the connection process. The jacks are distributed at intervals on the steel support, and the lifting rod, push blocks and positioning blocks work together to act on the steel casing, which can make the circumferential force on the steel casing more uniform. When a set of jacks is started, the piston end pushes the corresponding push block, and the lifting rod transmits the force to the push block below that is in contact with the positioning block. Then, the positioning block drives the steel casing to be lifted upward. The lifting rod on the other set of jacks plays a guiding role. After the lifting is completed, the push block of the other set of lifting rods is first placed against the piston of the jack, and then the other set of jacks is started.

[0008] Optionally, the push block that contacts the jack is inserted into the lifting rod via a plug rod, or is threaded onto the lifting rod.

[0009] By adopting the above technical solutions, a reliable connection between the push block and the lifting rod can be achieved, whether by plug-in or threaded connection.

[0010] Optionally, a nut is threaded to the lower end of the lifting rod, and the nut drives the push block to fit against the positioning block.

[0011] By adopting the above technical solution, during installation, the nut at the lower end of the lifting rod is tightened, and the nut pushes the push block upward, which can drive the push block to fit tightly against the lower surface of the positioning block, eliminating the gap between the push block and the positioning block, ensuring that the driving force of the jack is applied to the positioning block instantly, and ensuring the timeliness and stability of the lifting force transmission.

[0012] Optionally, the positioning block includes a fixing part and a plug-in part. The fixing part is fixedly welded to the wall of the steel casing. A slot is provided on the side of the fixing part opposite to the steel casing. The plug-in part is horizontally inserted into the slot. The lifting rod passes through the plug-in part.

[0013] By adopting the above technical solution, the connector can be reused.

[0014] Optionally, the plug-in portion has a through hole for the lifting rod to pass through, and one end of the plug-in portion that is inserted into the fixing portion has a relief groove, which allows the lifting rod to slide horizontally into the through hole.

[0015] By adopting the above technical solution, during the process of inserting the plug into the fixing part, the lifting rod can also be inserted into the plug, and the push block is located below the plug.

[0016] Optionally, the push block has a groove, and when the push block abuts against the insertion part, the fixing part is embedded in the groove.

[0017] By adopting the above technical solution, after the fixing part is embedded in the groove, the contact area between the push block and the positioning block increases, thereby increasing the connection stability between the push block and the positioning block.

[0018] Optionally, when the plug-in part is inserted into the fixing part, a locking rod is provided between the plug-in part and the fixing part.

[0019] By adopting the above technical solution, the locking rod, after passing through the insertion part and the fixing part, can restrict the relative displacement of the two in the horizontal and axial directions. During the removal of the steel casing, even if subjected to vibration or impact, the insertion part will not detach from the slot of the fixing part. When it is necessary to replace the insertion part, simply pull out the locking rod to remove the insertion part from the slot of the fixing part, making the operation simple and convenient.

[0020] Optionally, the locking rod and the plug-in portion are threaded together.

[0021] By adopting the above technical solution, the threaded connection has self-locking properties. After the locking rod is threadedly connected to the plug part, the locking rod will not loosen or fall off on its own due to construction vibration or other factors without external force. Compared with the simple through-type locking rod, its locking effect is more reliable, further ensuring the stability of the connection between the plug part and the fixed part.

[0022] In summary, this application includes at least one of the following beneficial effects: 1. During installation, simply pass the lifting rod through the positioning block and then install push blocks at both ends of the lifting rod to complete the connection between the device and the steel casing, which greatly simplifies the connection process; 2. The jacks are spaced apart on the steel support. Through the cooperation of the lifting rod, push block and positioning block, they act on the steel casing, which can make the circumferential force on the steel casing more uniform. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a cross-sectional view of the overall structure of an embodiment of this application; Figure 3 This is a partial structural diagram of an embodiment of this application; Figure 4 This is a cross-sectional view illustrating the threaded connection between the locking rod and the plug portion in an embodiment of this application.

[0024] Explanation of reference numerals in the attached drawings: 10, steel support; 11, Bailey bridge; 12, I-beam; 20, jack; 30, lifting rod; 40, positioning block; 41, fixing part; 42, insertion part; 43, slot; 44, through hole; 45, clearance groove; 50, push block; 51, groove; 60, nut; 70, locking rod. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail.

[0026] This application discloses an auxiliary device for removing steel casings during bridge pile foundation construction.

[0027] Reference Figure 1 An auxiliary device for removing steel casings during bridge pile foundation construction includes a steel support 10, jacks 20, lifting rods 30, positioning blocks 40, and push blocks 50. First, the steel support 10 is erected as the supporting structure for the entire device, ensuring sufficient strength and stability to withstand various forces during subsequent construction. The steel support 10 includes a Bailey bridge 11 and four I-beams 12 staggered on the Bailey bridge 11. Next, the four jacks 20 are spaced apart on the four I-beams 12; this spaced distribution design ensures a more even distribution of forces acting on the steel casing. The four jacks 20 are arranged in pairs, with two jacks 20 symmetrically positioned as a group. The jacks 20 are through-hole jacks, and the I-beams 12 have through holes for the lifting rods 30 to pass through.

[0028] Reference Figure 2 and Figure 3 The positioning block 40 is fixedly welded to the outer wall of the steel casing. It consists of a fixing part 41 and a plug-in part 42. The fixing part 41 is firmly welded to the wall of the steel casing, and a slot 43 is provided on the side of the fixing part 41 opposite to the steel casing. The plug-in part 42 is horizontally inserted into the slot 43. A through hole 44 for the lifting rod 30 to pass through is provided on the plug-in part 42, and a clearance groove 45 is provided at the end of the plug-in part 42 that is inserted into the fixing part 41. During installation, the lifting rod 30 is mounted on the jack 20, and the lifting rod 30 is slid horizontally through the clearance groove 45 into the through hole 44, so that the lifting rod 30 passes through the plug-in part 42, thereby achieving initial contact between the lifting rod 30 and the positioning block 40.

[0029] Reference Figure 1 Two push blocks 50 are detachably installed at both ends of the lifting rod 30. The push block 50 that contacts the piston end of the jack 20 has a circular cross-section and can be inserted into the lifting rod 30 by means of a plug rod or by means of a threaded connection. This embodiment of the application uses the threaded connection method. Both connection methods can ensure a reliable connection between the push block 50 and the lifting rod 30 and facilitate installation and disassembly.

[0030] Reference Figure 3A nut 60 is threadedly connected to the lower end of the lifting rod 30. During installation, the push block 50 located at the lower end of the lifting rod 30 is slidably installed on the lifting rod 30. The cross-section of the push block 50 at the lower end of the lifting rod 30 is rectangular. After the push block 50 is pushed into the appropriate position, the nut 60 is tightened. The nut 60 presses the push block 50 upward, causing the push block 50 to fit tightly against the lower surface of the positioning block 40 (specifically, in contact with the insertion part 42), eliminating the gap between the push block 50 and the positioning block 40, and ensuring that the driving force of the jack 20 can act on the positioning block 40 instantly and stably, thus ensuring the timeliness and stability of the lifting force transmission.

[0031] Reference Figure 3 The push block 50 at the lower end of the lifting rod 30 has a groove 51. When the push block 50 abuts against the insertion part 42, the fixing part 41 is embedded in the groove 51. This greatly increases the contact area between the push block 50 and the positioning block 40, further enhancing the connection stability between the push block 50 and the positioning block 40, making the whole device more reliable when under force.

[0032] Reference Figure 3 and Figure 4 After the insertion part 42 is inserted into the fixing part 41, a locking rod 70 is inserted between the insertion part 42 and the fixing part 41, and the locking rod 70 and part of the insertion part 42 are connected by threads. The threaded connection has self-locking properties. After the locking rod 70 is threadedly connected to the insertion part 42, it will not loosen or fall off due to construction vibration or other factors without external force. After the locking rod 70 passes through the insertion part 42 and the fixing part 41, it can effectively limit the relative displacement of the two in the horizontal and axial directions. During the removal of the steel casing, even if subjected to vibration or impact, the insertion part 42 will not detach from the slot 43 of the fixing part 41. When it is necessary to replace the insertion part 42, simply pull out the locking rod 70 to remove the insertion part 42 from the slot 43 of the fixing part 41, which is simple and convenient.

[0033] The implementation principle of the auxiliary device for removing steel casing in bridge pile foundation construction according to an embodiment of this application is as follows: In actual construction, multiple jacks 20 are divided into two groups, which are activated alternately. When one group of jacks 20 is activated, the piston end pushes the corresponding push block 50, and the lifting rod 30 transmits the force to the push block 50 below, which is in contact with the positioning block 40. This, in turn, drives the steel casing upward through the positioning block 40. At this time, the lifting rod 30 on the other group of jacks 20 acts as a guide. After the lifting is completed, the push block 50 of the other group of lifting rods 30 is first placed against the piston of the jack 20, and then the other group of jacks 20 is activated. This cycle is repeated to gradually remove the steel casing.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An auxiliary device for removing steel casings during bridge pile foundation construction, characterized in that: include: Steel support (10); Jacks (20) are spaced apart on the steel support (10); A lifting rod (30) is installed on the jack (20); The positioning block (40) is fixedly welded to the outer wall of the steel casing, and the lifting rod (30) passes through the positioning block (40). Two push blocks (50) are detachably installed on both ends of the lifting rod (30). One push block (50) is in contact with the lower surface of the positioning block (40), and the other push block (50) is in contact with the piston end of the jack (20). The multiple jacks (20) are divided into two groups, and the two groups of jacks (20) are started alternately.

2. The auxiliary device for removing steel casings in bridge pile foundation construction according to claim 1, characterized in that: The push block (50) that contacts the jack (20) is inserted into the lifting rod (30) by means of a plug or is threaded onto the lifting rod (30).

3. The auxiliary device for removing steel casings in bridge pile foundation construction according to claim 1, characterized in that: The lower end of the lifting rod (30) is threaded with a nut (60), which drives the push block (50) to fit against the positioning block (40).

4. The auxiliary device for removing steel casings in bridge pile foundation construction according to claim 3, characterized in that: The positioning block (40) includes a fixing part (41) and a plug-in part (42). The fixing part (41) is fixedly welded to the wall of the steel casing. A slot (43) is provided on the side of the fixing part (41) opposite to the steel casing. The plug-in part (42) is horizontally inserted into the slot (43). The lifting rod (30) passes through the plug-in part (42).

5. The auxiliary device for removing steel casings in bridge pile foundation construction according to claim 4, characterized in that: The plug part (42) has a through hole (44) for the lifting rod (30) to pass through. The end of the plug part (42) that is inserted into the fixing part (41) has a relief groove (45) for the lifting rod (30) to slide horizontally into the through hole (44).

6. The auxiliary device for removing steel casings in bridge pile foundation construction according to claim 5, characterized in that: The push block (50) has a groove (51). When the push block (50) abuts against the plug-in part (42), the fixing part (41) is embedded in the groove (51).

7. The auxiliary device for removing steel casings in bridge pile foundation construction according to claim 5, characterized in that: When the plug (42) is inserted into the fixing part (41), a locking rod (70) is provided between the plug (42) and the fixing part (41).

8. The auxiliary device for removing steel casings in bridge pile foundation construction according to claim 7, characterized in that: The locking rod (70) and the plug (42) are threaded together.

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