Temporary connection system for latticed column plumb and construction method thereof

Abstract

The present application relates to a kind of temporary connection system for lattice column vertical adjustment and its construction method, including lattice column, tool section and embedded connection device, lattice column is equipped with angle steel at four corners respectively, and a plurality of bearing bottom plates with let hole are arranged on each angle steel, and the outside of bearing bottom plate is equipped with limiting weld plate;The bottom of tool section is equipped with at least two limit plates, and the lowermost limit plate is equipped with first limit hole, and the rest limit plate is equipped with second limit hole;The top of tool section is equipped with counterforce plate;Embedded connection device includes multi-hole steel pipe and ball embedding element, ball embedding element includes pull rod and a plurality of conical base, and a plurality of balls are arranged on each conical base;Multi-hole steel pipe is sequentially passed through let hole on bearing bottom plate and first limit hole;Pull rod is sequentially threaded out of multi-hole steel pipe and second limit hole, and is detachably connected with counterforce plate;When ball is protruded from the round hole of multi-hole steel pipe, it is in close contact with limiting weld plate.The present application is reliable in connection, convenient in removal, and low in cost.

Description

Technical Field

[0001] This invention relates to the field of foundation pit engineering technology, and in particular to a temporary connection system for adjusting the verticality of lattice columns and its construction method. Background Technology

[0002] In the construction of deep foundation pits using the reverse construction method, a construction scenario involving one column and one pile is frequently encountered. This involves inserting a lattice column into a bored pile, using the bored pile as the foundation load-bearing component and the lattice column as the structural column. To meet usage requirements, the verticality of the lattice column construction is critical, necessitating additional vertical adjustment methods beyond the conventional pile foundation construction measures.

[0003] Currently, the verticality of lattice columns is generally adjusted using the portion of the column extending above ground level, with the aid of a plumb bob, and by the column's own weight. However, in the design of multi-story basements, when a single column and pile only needs to extend to the top slab of the first or second basement level, the portion exceeding the design length must be removed later. This construction situation results in the overlapping of excavation and column removal, significantly reducing efficiency and causing considerable damage to the lattice columns themselves, hindering their recycling and greatly increasing project costs.

[0004] To address the issues of lattice column removal and recycling in the aforementioned scenarios, a connecting device is needed to divide the lattice column into an effective length segment and a sag adjustment segment. After sag adjustment, the sag adjustment segment can be separated and reused to improve construction efficiency and reduce costs. However, the hoisting and sag adjustment process of lattice columns involves complex stress conditions such as bending, rotation, and dynamic loads. Effective sag adjustment requires sufficient rigidity in the connecting nodes, while convenient disassembly requires sufficient reversibility. Currently, there is no reliable device to achieve these connection characteristics, nor is there a mature application method to meet the requirements of reverse construction. Summary of the Invention

[0005] This invention provides a temporary connection system and construction method for adjusting the sag of lattice columns, in order to solve the above-mentioned technical problems.

[0006] To address the aforementioned technical problems, this invention provides a temporary connection system for adjusting the sag of lattice columns, comprising the lattice column, a tool section, and a fastening connection device.

[0007] Angle steel is provided at each of the four corners of the lattice column. Several horizontal bearing base plates are arranged vertically on each angle steel. Each bearing base plate is provided with a clearance hole. An L-shaped limiting welding plate is arranged vertically on the outside of the bearing base plate.

[0008] The tool section is a rectangular frame that matches the external dimensions of the lattice column. The bottom of the tool section is provided with at least two vertically distributed limiting plates. The limiting plates are horizontally mounted inside the rectangular frame. The bottommost limiting plate is provided with four first limiting holes, and the remaining limiting plates are provided with four second limiting holes. The top of the tool section is provided with a reaction plate.

[0009] The embedding connection device includes an outer porous steel pipe and an inner ball bearing embedding element. The ball bearing embedding element includes a pull rod, on which a plurality of conical bases are mounted. The conical bases are distributed at intervals around the pull rod as an axis and along the axial direction of the pull rod. Each conical base is provided with a plurality of balls. The wall of the porous steel pipe is provided with multiple groups of layered circular holes. The position of each group of circular holes corresponds to the position between two adjacent conical bases. The number and position of each group of circular holes correspond to the balls on each conical base.

[0010] The tool section is placed above the lattice column, and the perforated steel pipe passes through the clearance hole and the first limiting hole in sequence on the bearing base plate; the tie rod passes through the perforated steel pipe and the second limiting hole in sequence, and is detachably connected to the reaction plate by the reaction bolt; when the ball protrudes from the round hole of the perforated steel pipe, it can make close contact with the limiting welding plate.

[0011] Preferably, the tool section has a number of mud holes around its perimeter.

[0012] Preferably, the length of the tool section corresponds to the difference between the design elevation of the top of the lattice column and the top elevation of the ground vertical adjustment section.

[0013] Preferably, the diameter of the pull rod is less than or equal to 20 mm.

[0014] The present invention also provides a construction method for a temporary connection system for adjusting the sag of lattice columns as described above, comprising the following steps:

[0015] Step 1: Based on the length and weight of the lattice column to be adjusted, calculate the load-bearing capacity requirement of the embedded connection device, and fabricate the embedded connection device based on the load-bearing capacity requirement;

[0016] Step 2: Calculate the length of the tool section based on the difference between the design elevation of the top of the lattice column and the top elevation of the ground vertical adjustment section; confirm the opening size of the first limiting hole and the second limiting hole based on the size of the embedded connection device, and complete the processing of the tool section;

[0017] Step 3: Determine the length of the limiting welding plate and the number of the bearing base plates in the lattice column according to the embedded connection device; determine the size of the relief hole in the bearing base plate according to the size of the porous steel pipe, and complete the processing of the lattice column;

[0018] Step 4: Assemble the embedded connection device, lattice column, and tool section on the ground with them lying flat. After the verticality of the three meets the construction requirements, adjust the tie rod so that the embedded connection device can tightly fix the lattice column and the tool section through the reaction force of the ball bearing on the bearing base plate. Then tighten the reaction bolts at the top of the tie rod on the reaction plate.

[0019] Step 5: After the temporary connection system is hoisted, its verticality is adjusted a second time under the action of gravity using a plumb bob.

[0020] Step 6: After the vertical adjustment is completed, pour concrete. After the concrete has initially set, loosen the reaction bolts to release the connection between the embedded connection device and the tool section and the lattice column.

[0021] Preferably, manufacturing the embedded connection device based on the load-bearing capacity requirement includes: calculating the material and diameter of the tie rod of the ball bearing element and the number of balls, and completing the processing of the embedded connection device.

[0022] Preferably, the diameter of the pull rod is less than or equal to 20 mm.

[0023] Preferably, the tool section has a number of mud holes around its perimeter.

[0024] Compared with the prior art, the temporary connection system and construction method for adjusting the sag of lattice columns provided by the present invention have the following advantages:

[0025] The temporary connection system provided by this invention utilizes the cooperation between the balls in the ball-embedded element and the porous steel pipe. When the balls are retracted inside the porous steel pipe, the lattice column, tool section, and embedding connection device can move freely. When the balls protrude from the round hole of the porous steel pipe, the lattice column, tool section, and embedding connection device are firmly connected, thereby giving the connection node sufficient rigidity and reversibility. This satisfies the need for effective vertical adjustment of the lattice column, facilitates disassembly, and allows the tool section to be recycled and reused, greatly saving costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a temporary connection system for adjusting the sag of lattice columns according to a specific embodiment of the present invention;

[0027] Figure 2 This is a top view of the lattice column and the embedded connection device after installation in a specific embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a lattice column in a specific embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the tool section in a specific embodiment of the present invention;

[0030] Figure 5 This is a three-dimensional structural diagram of the embedding connection device according to a specific embodiment of the present invention;

[0031] Figure 6 This is a three-dimensional structural diagram of a porous steel pipe according to a specific embodiment of the present invention;

[0032] Figure 7 This is a three-dimensional structural diagram of a ball bearing retainer element in a specific embodiment of the present invention.

[0033] In the diagram: 01-Concrete guide pipe; 10-Lattice column; 11-Angle steel; 12-Bearing base plate; 13-Relief hole; 14-Limiting welding plate; 20-Tool section; 21-Limiting plate; 22-First limiting hole; 23-Second limiting hole; 24-Reaction plate; 25-Reaction bolt; 26-Mulch hole; 30-Fixing connection device; 31-Porous steel pipe; 32-Round hole; 33-Ball bearing embedding element; 34-Tie rod; 35-Conical base; 36-Ball bearing. Detailed Implementation

[0034] To illustrate the technical solutions of the invention in more detail, specific embodiments are listed below to demonstrate the technical effects; it should be emphasized that these embodiments are used to illustrate the invention and not to limit the scope of the invention.

[0035] The temporary connection system for adjusting the sag of lattice columns provided by this invention, such as Figure 1 and Figure 2 As shown, the structure includes a lattice column 10, a tool section 20, and a fastening connection device 30. This application divides the existing lattice column structure into an effective length section (i.e., the lattice column 10 in this application) and a vertical adjustment section (i.e., the tool section 20). The fastening connection device 30 is used to achieve a tight connection between the lattice column 10 and the tool section 20 and facilitate dismantling.

[0036] Specifically, please refer to the following: Figure 3 Angle steel 11 is provided at each of the four corners of the lattice column 10. Each angle steel 11 has several horizontally spaced supporting base plates 12 along its vertical axis. Each supporting base plate 12 has clearance holes 13, with the central axes of all clearance holes 13 coinciding and having the same diameter. An L-shaped limiting welded plate 14 is vertically arranged on the outer side of each supporting base plate 12, forming a frame with the angle steel 11. The angle steel 11, supporting base plates 12, and limiting welded plates 14 constitute the connecting accessories of the lattice column 10, used for connection with the tool section 20 and the embedded connection device 30.

[0037] Please refer to this carefully. Figure 1 and Figure 4 The tool section 20 is a rectangular frame that matches the external dimensions of the lattice column 10. That is, the width and other dimensions of the tool section 20 can be customized according to space constraints and the type of the lattice column 10. The bottom of the tool section 20 is provided with at least two vertically distributed limiting plates 21, which are horizontally mounted inside the rectangular frame. The lowest limiting plate 21 has four first limiting holes 22. Figure 1 The middle part overlaps with the perforated steel pipe 31, and is used for the perforated steel pipe 31 to pass through. The perforated steel pipe 31 can be welded to the edge of the first limiting hole 22; the remaining limiting plate 21 is provided with four second limiting holes 23 ( Figure 1 The tool section 20 (which overlaps with the tie rod 34) is used for the tie rod 34 to pass through; the top of the tool section 20 is provided with a reaction plate 24. The tool section 20 can be tightly connected to the lattice column 10 during the sag adjustment stage to ensure the sag adjustment effect; after the sag adjustment is completed, it can be detached from the lattice column 10, thereby realizing convenient recycling and reuse.

[0038] Please refer to this carefully. Figures 5 to 7 The embedded connection device 30 includes an outer porous steel pipe 31 and an inner ball bearing embedded element 33. In some embodiments, the embedded connection device 30 can be composed of multiple identical units stacked together, and the specific number can be customized according to the actual situation. The ball bearing embedded element 33 includes a pull rod 34, on which a plurality of conical bases 35 are mounted. The conical bases 35 are distributed at intervals along the axial direction of the pull rod 34 with the pull rod 34 as the axis. Each conical base 35 is provided with a plurality of balls 36. The wall of the porous steel pipe 31 is provided with multiple groups of layered circular holes 32. The position of each group of circular holes 32 corresponds to the position between two adjacent conical bases 35, and the number and position of each group of circular holes 32 correspond to the balls 36 on each conical base 35. By pulling the lever 34, the ball bearing 36 on the conical base 35 can be moved vertically. When the ball bearing 36 moves to the round hole 32, the ball bearing 36 moves down along the inclined surface of the conical base 35, so that a part of the ball bearing 36 protrudes from the round hole 32 to the outside of the porous steel pipe 31.

[0039] Please refer to this carefully. Figure 1 and Figure 2 The tool section 20 is placed above the lattice column 10. The porous steel pipe 31 passes through the clearance hole 13 and the first limiting hole 22 on the bearing base plate 12 in sequence. The tie rod 34 passes through the porous steel pipe 31 and the second limiting hole 23 in sequence, and is detachably connected to the reaction plate 24 by the reaction bolt 25 to provide reaction force. When the ball 36 protrudes from the round hole 32 of the porous steel pipe 31, it can make close contact with the limiting welding plate 14.

[0040] In this application, when the pull rod 34 of the ball bearing retaining element 33 is pulled upward, a portion of the ball bearing 36 is squeezed out of the round hole 32 of the porous steel pipe 31. Continuing to pull the pull rod 34 of the ball bearing retaining element 33 causes the ball bearing 36 to interfere with the bearing base plate 12 and generate compressive force, thereby providing vertical tension to the lattice column 10 and ensuring the connection effect between the lattice column 10 and the retaining connection device 30. Simultaneously, the compressive force generated by the close contact between the ball bearing 36 and the surrounding limiting welding plates 14 can also provide a force for a tight connection between the lattice column 10 and the tool section 20, ensuring the vertical adjustment effect. After the lattice column 10 is verticalized and the concrete has hardened, the pull rod 34 can be released downward to release the ball bearing 36, thus disconnecting the lattice column 10 from the tool section 20. However, at this time, the retaining connection device 30 is still connected to the tool section 20 through the reaction bolts 25 of the reaction plate 24. The tool section 20 and the embedded connection device 30 can then be removed from the lattice column 10 together, enabling convenient recycling and reuse.

[0041] The invention has a clear principle, reliable device, and quick operation, which can significantly improve the efficiency of adjusting the verticality of the lattice column 10 during reverse construction, and greatly reduce construction costs through the recycling of the tool section 20. In addition, the equipment dimensions in this application (such as the number of identical units of the embedded connection device 30, the width of the tool section 20, etc.) can be customized according to space constraints and the type of lattice column 10; and the components are connected by modular units, which can adapt to a wide range of spaces and can be used for multiple projects.

[0042] In some embodiments, please refer to the following: Figure 4 The tool section 20 is provided with several mud holes 26 around its perimeter to facilitate the concrete pouring process.

[0043] In some embodiments, the length (vertical height) of the tool section 20 corresponds to the difference between the design elevation of the top of the lattice column 10 and the top elevation of the ground vertical adjustment section, which neither affects the effective length of the lattice column 10 nor fails to maximize the recovery of the tool section 20.

[0044] In some embodiments, the diameter of the tie rod 34 is less than or equal to 20 mm to avoid the tie rod 34 being too thick and affecting the transmission of bending moment and shear force between the tool section 20 and the lattice column 10.

[0045] The present invention also provides a construction method for a temporary connection system for adjusting the sag of lattice columns as described above, comprising the following steps:

[0046] Step 1: Based on the length and weight of the lattice column 10 to be adjusted, the load-bearing capacity requirement of the embedded connection device 30 is calculated, and the embedded connection device 30 is manufactured based on the load-bearing capacity requirement. In some embodiments, the material (steel grade) and diameter of the tie rod 34 of the ball bearing embedded element 33, and the number of balls 36 can be calculated, and the processing of the embedded connection device 30 can be completed. In some embodiments, the porous steel pipe 31 and the ball bearing embedded element 33 can both be composed of multiple identical units stacked together, so that the number of balls 36 can be adjusted by increasing or decreasing the number of identical units.

[0047] Step 2: Calculate the length (vertical height) of the tool section 20 based on the difference between the design elevation of the top of the lattice column 10 and the top elevation of the ground vertical adjustment section; confirm the opening size of the second limiting hole 23 based on the size of the tie rod 34, and confirm the opening size of the first limiting hole 22 based on the size of the porous steel pipe 31, thereby completing the processing of the tool section 20.

[0048] Step 3: Determine the length of the limiting welded plate 14 and the number of the bearing base plates 12 within the lattice column 10 based on the number of identical units of the embedded connection device 30; determine the size of the clearance hole 13 in the bearing base plate 12 based on the size of the porous steel pipe 31, and complete the processing of the lattice column 10. In some embodiments, the length of the limiting welded plate 14 and the number of the bearing base plates 12 within the lattice column 10 can be increased or decreased according to different stiffness requirements.

[0049] Step 4: After assembling the embedded connection device 30, lattice column 10, and tool section 20 on a horizontal surface, erect them on site. Once the verticality of all three meets the construction requirements, adjust the tie rod 34 so that the embedded connection device 30, through the reaction force of the ball bearings 36 on the bearing base plate 12, tightly fixes the lattice column 10 and the tool section 20. Then, tighten the reaction bolt 25 at the top of the tie rod 34 on the reaction plate 24. In this way, the vertical gravity bearing of the lattice column 10 can be achieved through the reaction plate 24 during hoisting.

[0050] Step 5: After the temporary connection system is hoisted, the verticality is adjusted a second time under the action of gravity by adjusting the verticality plate (not shown). The reaction force of the ball bearing 36 on the limiting welding plate 14 is used to realize the transmission of bending moment and shear force between the tool section 20 and the lattice column 10 during the vertical adjustment process.

[0051] Step 6: After the vertical adjustment is completed, concrete is poured through the concrete guide pipe 01 in the middle. After the concrete has initially set, the reaction bolt 25 is loosened, and the connection between the embedded connection device 30 and the tool section 20 and the lattice column 10 is released.

[0052] By adopting the above construction method, the effective vertical adjustment of the lattice column 10 and the convenient disassembly of the tool section 20 can be achieved, and the construction efficiency can be improved through turnover.

[0053] In summary, the temporary connection system for adjusting the verticality of a lattice column provided by the present invention includes a lattice column 10, a tool section 20, and an embedded connection device 30. Angle steel 11 is provided at each of the four corners of the lattice column 10. Each angle steel 11 has several horizontally spaced bearing base plates 12 arranged vertically along its sides. Each bearing base plate 12 has clearance holes 13, and an L-shaped limiting welding plate 14 is arranged vertically on the outer side of each bearing base plate 12. The tool section 20 is connected to the lattice column 10... The tool section 20 has a rectangular frame with matching dimensions. At least two vertically distributed limiting plates 21 are provided at the bottom of the tool section 20. The limiting plates 21 are horizontally mounted inside the rectangular frame. The lowest limiting plate 21 has four first limiting holes 22, and the remaining limiting plates 21 have four second limiting holes 23. A reaction plate 24 is provided at the top of the tool section 20. The embedded connection device 30 includes an outer porous steel pipe 31 and an inner ball bearing embedding element 33. Component 33 includes a pull rod 34, on which a plurality of conical bases 35 are mounted. The conical bases 35 are spaced apart about the pull rod 34 and along its axial direction. Each conical base 35 is provided with a plurality of ball bearings 36. The wall of the porous steel pipe 31 is provided with multiple groups of layered circular holes 32. The position of each group of circular holes 32 corresponds to the position between two adjacent conical bases 35. The number and position of each group of circular holes 32 correspond to the number of balls 36 on each conical base 35. The ball bearing 36 corresponds to the tool section 20, which is positioned above the lattice column 10. The porous steel pipe 31 passes sequentially through the clearance hole 13 and the first limiting hole 22 on the bearing base plate 12. The tie rod 34 passes sequentially through the porous steel pipe 31 and the second limiting hole 23, and is detachably connected to the reaction plate 24 via a reaction bolt 25. When the ball bearing 36 protrudes from the circular hole 32 of the porous steel pipe 31, it can make close contact with the limiting welding plate 14. The invention has a clear principle, reliable device, and quick operation, which can significantly improve the efficiency of adjusting the verticality of the lattice column 10 during reverse construction, and greatly reduce construction costs through the recycling of the tool section 20.

[0054] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A temporary connection system for adjusting the sag of lattice columns, characterized in that, Includes lattice columns, tool sections, and embedded connection devices. Angle steel is provided at each of the four corners of the lattice column. Several horizontal bearing base plates are arranged vertically on each angle steel. Each bearing base plate is provided with a clearance hole. An L-shaped limiting welding plate is arranged vertically on the outside of the bearing base plate. The tool section is a rectangular frame that matches the external dimensions of the lattice column. The bottom of the tool section is provided with at least two vertically distributed limiting plates. The limiting plates are horizontally mounted inside the rectangular frame. The bottommost limiting plate is provided with four first limiting holes, and the remaining limiting plates are provided with four second limiting holes. The top of the tool section is provided with a reaction plate. The embedding connection device includes an outer porous steel pipe and an inner ball bearing embedding element. The ball bearing embedding element includes a pull rod, on which a plurality of conical bases are mounted. The conical bases are distributed at intervals around the pull rod as an axis and along the axial direction of the pull rod. Each conical base is provided with a plurality of balls. The wall of the porous steel pipe is provided with multiple groups of layered circular holes. The position of each group of circular holes corresponds to the position between two adjacent conical bases. The number and position of each group of circular holes correspond to the balls on each conical base. The tool section is placed above the lattice column, and the perforated steel pipe passes through the clearance hole and the first limiting hole in sequence on the bearing base plate; the tie rod passes through the perforated steel pipe and the second limiting hole in sequence, and is detachably connected to the reaction plate by the reaction bolt; when the ball protrudes from the round hole of the perforated steel pipe, it can make close contact with the limiting welding plate.

2. The temporary connection system for adjusting the sag of lattice columns as described in claim 1, characterized in that, The tool section has several mud holes around its perimeter.

3. The temporary connection system for adjusting the sag of lattice columns as described in claim 1, characterized in that, The length of the tool section corresponds to the difference between the design elevation of the top of the lattice column and the top elevation of the ground vertical adjustment section.

4. The temporary connection system for adjusting the sag of lattice columns as described in claim 1, characterized in that, The diameter of the pull rod is less than or equal to 20 mm.

5. A construction method for a temporary connection system for adjusting the sag of lattice columns as described in claim 1, characterized in that, Includes the following steps: Step 1: Based on the length and weight of the lattice column to be adjusted, calculate the load-bearing capacity requirement of the embedded connection device, and fabricate the embedded connection device based on the load-bearing capacity requirement; Step 2: Calculate the length of the tool section based on the difference between the design elevation of the top of the lattice column and the top elevation of the ground vertical adjustment section; confirm the opening size of the first limiting hole and the second limiting hole based on the size of the embedded connection device, and complete the processing of the tool section; Step 3: Determine the length of the limiting welding plate and the number of the bearing base plates in the lattice column according to the embedded connection device; determine the size of the relief hole in the bearing base plate according to the size of the porous steel pipe, and complete the processing of the lattice column; Step 4: Assemble the embedded connection device, lattice column, and tool section on the ground with them lying flat. After the verticality of the three meets the construction requirements, adjust the tie rod so that the embedded connection device can tightly fix the lattice column and the tool section through the reaction force of the ball bearing on the bearing base plate. Then tighten the reaction bolts at the top of the tie rod on the reaction plate. Step 5: After the temporary connection system is hoisted, its verticality is adjusted a second time under the action of gravity using a plumb bob. Step 6: After the vertical adjustment is completed, pour concrete. After the concrete has initially set, loosen the reaction bolts to release the connection between the embedded connection device and the tool section and the lattice column.

6. The construction method as described in claim 5, characterized in that, The fabrication of the embedded connection device based on the load-bearing capacity requirement includes: calculating the material and diameter of the tie rod of the ball bearing embedded element and the number of balls, and completing the processing of the embedded connection device.

7. The construction method as described in claim 6, characterized in that, The diameter of the pull rod is less than or equal to 20 mm.

8. The construction method as described in claim 5, characterized in that, The tool section has several mud holes around its perimeter.

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