Construction method for controlling super-filling height of one-column-one-pile top-down method

Abstract

The application provides a construction method for controlling the super-filling height of a column-pile in a reverse construction method, which comprises the following steps: making a turnover platform, making a lengthening pipe, processing an inner lining pipe, constructing an anti-flow baffle, constructing a column-pile, removing the lengthening pipe, chiseling off the steel pipe column and pile body floating slurry, and the like. The application can avoid site hardening, save cost, avoid resource waste, has a certain residual value, and has economic benefits.

Description

Technical Field

[0001] This invention relates to the field of single-pillar construction technology, specifically a construction method for controlling the over-grouting height of single-pillar construction using a reverse construction method. Background Technology

[0002] With the continuous development of my country's construction industry, various building forms are emerging, deep foundation pit projects are increasing, construction sites in urban areas are becoming smaller, and working conditions are becoming more complex. Reverse construction methods are becoming more prevalent, and the "one column, one pile" method is a crucial step in this method, with its construction quality being a decisive factor in the success or failure of such projects. In "one column, one pile" construction, to ensure the strength of the pile concrete, the steel pipe column and the pile concrete are usually poured simultaneously. A certain pressure difference exists between the two concrete surfaces, requiring backfilling with granular material for counter-pressure, which is time-consuming and labor-intensive. This often results in an overfill of the pile concrete, which needs to be removed later, wasting time, labor, and materials.

[0003] Currently, in one-pillar-one-pile construction, the top of the steel column often protrudes above the natural ground level to facilitate plumb adjustment and control the concrete strength inside the steel pipe. The concrete is poured up to the top of the steel pipe, and the excess portion is later cut off, the concrete is removed, resulting in wasted materials, manpower, and delayed construction. This construction method fails to meet the national requirements for green construction and energy conservation and emission reduction, and it is also incompatible with the need for refined management in the construction industry, leading to losses for construction companies. Therefore, improving the control of over-pouring height in one-pillar-one-pile construction based on green construction, material conservation, and refined management is an urgent problem to be solved. Summary of the Invention

[0004] In view of the above-mentioned prior art, the present invention proposes a construction method for controlling the over-grouting height of one column and one pile using the reverse construction method.

[0005] This invention provides a construction method for controlling the over-grouting height of a single-column, single-pile structure using a reverse construction method, comprising the following steps:

[0006] S1. Construction of a turnover platform: A turnover platform is constructed to reinforce the soil at the opening of a pile hole.

[0007] S2. Fabrication of extension pipes: Some time before the construction of each column and pile, the steel pipe column is detailed. The extension pipe is detailed according to the diameter of the steel pipe column. The length of the extension pipe is determined according to the height from the design top elevation of the steel pipe column to the ground and the length of the sag section. The quantity is determined according to the number of steel pipe columns to ensure reusability. The material and wall thickness of the extension pipe are the same as those of the steel pipe column. The extension pipe is connected to the steel pipe column by flange bolts. At the connection point of the extension pipe, one diameter above the steel pipe column, overflow holes are symmetrically left on both sides. During grouting, excess concrete flows out through the overflow holes to ensure that the extension pipe can be reused.

[0008] S3. Processing the inner lining pipe: After the steel pipe column is processed, the inner lining pipe is welded at the designed top elevation of the steel pipe column;

[0009] S4. Construction anti-flow baffle: Based on the length of the steel pipe column embedded in the pile body, an anti-flow baffle is installed on the steel pipe column at a distance of one pile diameter above the design elevation of the pile top.

[0010] S5. Construction of one column and one pile: Pile foundation construction process, pile foundation measurement and positioning → installation of casing → injection of mud → pile foundation positioning → drilling → continued drilling → slag removal → hole cleaning → placement of turnover platform → hoisting of steel cage → hoisting of steel pipe column → vertical adjustment → insertion of concrete guide pipe → second cleaning → pouring of pile body concrete → replacing with high-grade concrete to pour steel pipe column concrete → second vertical adjustment after pouring → post-grouting of pile end → pile foundation inspection.

[0011] S6. Removal of extension pipe: After the pile foundation has been in place for a period of time, the extension pipe and turnover platform are removed and turnover construction is carried out. The steel pipe column and the pile hole are directly backfilled with sand and gravel to ensure the verticality of the steel pipe column.

[0012] S7. Remove laitance from steel pipe columns and pile bodies: First, during the construction of the structural B0 slab, cut off the inner lining pipe at the top of the steel pipe column and remove the laitance inside the steel pipe column to ensure the concrete strength of the steel pipe column and reliable connection with the first-floor column. During the construction of the base slab, remove the laitance between the anti-flow baffle and the designed pile top to ensure the concrete strength of the pile top, the quality of the embedded section of the steel pipe column, and reliable connection between the pile body and the base slab.

[0013] Preferably, in S1, the turnover platform includes an inner circular steel ring and an outer square channel steel edging. The diameter of the circular steel ring is slightly larger than the diameter of the protective cylinder. The circular steel ring and the square channel steel edging are connected and fixed with steel profiles. The empty part is tied with reinforcing bars and poured with concrete.

[0014] Preferably, in S3, the inner lining tube has a wall thickness of 5 mm, a length that is twice the diameter of the steel pipe column, and a diameter that is 20 mm smaller than the inner diameter of the steel pipe column.

[0015] Preferably, in S4, the anti-flow baffle includes a sleeve, which is welded to the steel pipe column. Three sector-shaped baffles are hinged to the outer end of the sleeve. A 45° limiting angle plate is welded to the outer wall of the sleeve below the three sector-shaped baffles, and a 90° limiting angle plate is welded to the outer wall of the sleeve above the three sector-shaped baffles.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention provides a construction method for controlling the over-grouting height of a single column and pile using a reverse construction method. The turnover platform made of steel-concrete composite material can be reused, avoiding site hardening, saving costs, avoiding resource waste, and having a certain residual value, thus having economic benefits.

[0018] 2. The extension pipe in this invention effectively avoids the need for later cutting of the section above ground level in the designed steel pipe column. It is detachable and reusable. The diameter and length of the extension pipe are determined based on the steel pipe column diameter and the designed top elevation. An overflow hole is provided at the top of the inner lining pipe to prevent concrete from entering the extension pipe and affecting its reuse, while ensuring sufficient over-pouring height of concrete within the steel pipe column. The inner lining pipe connects to the top of the steel pipe column, with a length equal to 1D of the steel pipe diameter. This ensures the strength of the concrete at the top of the steel pipe column, and the overflow hole further controls the over-pouring height. Disassembly of the extension pipe is relatively convenient. This method controls the over-pouring height, ensures the strength of the concrete at the top of the steel pipe column, and facilitates the later removal of over-pouring at the top of the steel pipe column, saving manpower and financial resources.

[0019] 3. The anti-flow baffle in this invention can effectively solve the problem of pressure difference between the concrete liquid surface inside the steel pipe column and the concrete liquid surface of the pile body, avoid excessive over-pouring of the pile body concrete, save filling material, save materials and manpower, shorten the pile formation time of one column and one pile, improve the pile formation quality of one column and one pile, facilitate demolition in the later stage, and ensure the strength of the concrete at the top of the pile. Attached Figure Description

[0020] Figure 1 This is a construction diagram of an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the turnover platform in an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the extension tube in an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the inner liner tube in an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the anti-flow baffle in an embodiment of the present invention.

[0025] Among them, 1. turnover platform; 11. circular steel ring; 12. square channel steel edging; 13. structural steel; 14. reinforcing steel; 15. C40 concrete; 2. steel pipe column; 3. extension pipe; 31. overflow hole; 4. inner lining pipe; 5. anti-flow baffle; 51. sleeve; 52. fan-shaped baffle; 53. pull ring. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations. Example

[0027] A construction method for controlling the over-grouting height of a single-column, single-pile structure using a reverse construction method, such as... Figure 1-5 As shown, it includes the following steps:

[0028] S1. Construction of a turnover platform: A turnover platform 1 is constructed to reinforce the soil at the opening of the pile hole. The turnover platform 1 includes an inner circular steel ring 11 and an outer square channel steel edging 12. The diameter of the circular steel ring 11 is 10 cm larger than the diameter of the casing. The square channel steel edging 12 is 4 m × 4 m in size. The thickness of the circular steel ring 11 is 15 mm. The circular steel ring 11 and the square channel steel edging 12 are connected and fixed with steel section 13. The remaining part is tied with steel bars 14 and poured with C40 concrete 15. It provides an operating platform for adjusting the verticality of the pile and pouring concrete. It can be used repeatedly and is completed 30 days before the construction of the pile.

[0029] S2. Fabrication of extension pipes: 15 days before the construction of each column and pile, complete the detailed design of steel pipe column 2. Based on the diameter of steel pipe column 2, detail the extension pipe 3. The length of extension pipe 3 is determined according to the design elevation of the steel pipe column to the ground and the length of the sag section. The quantity is determined according to the number of steel pipe columns to ensure reusability. The material and wall thickness of extension pipe 3 are the same as those of steel pipe column 2. Extension pipe 3 is connected to steel pipe column 2 using flange bolts. At the connection point of extension pipe 3, one time the diameter of the steel pipe column, symmetrical overflow holes 31 with a diameter of 150 mm are left on both sides. During grouting, excess concrete flows out through the overflow holes 31 to ensure that extension pipe 3 can be reused.

[0030] S3. Processing the inner lining pipe: After the steel pipe column 2 is processed, the inner lining pipe 4 is welded at the designed top elevation of the steel pipe column. The inner lining pipe has a wall thickness of 5 mm, a length that is twice the diameter of the steel pipe column, and a diameter that is 20 mm smaller than the inner diameter of the steel pipe column. This ensures the over-pouring height of the concrete at the top of the steel pipe column and facilitates the connection of the extension pipe 3.

[0031] S4. Construction Anti-Fluid Flow Baffle: Based on the embedment length of the steel pipe column into the pile body, an anti-fluid flow baffle 5 is installed on the steel pipe column 2 at a distance equal to one pile diameter above the design elevation of the pile top. The anti-fluid flow baffle 5 can be automatically opened by the buoyancy of the concrete to prevent the concrete from rising upwards and ensure that the concrete in the pile body is not over-poured. The anti-fluid flow baffle 5 includes a sleeve 51, which is welded to the steel pipe column 2. Three sector-shaped baffles 52 are hinged to the outer end of the sleeve 51. The sector-shaped baffles 52 are made of 15 mm thick steel plates. The outer wall of the sleeve 51 is welded with 45° limiting devices below the three sector-shaped baffles 52. Angle plates are used to allow the anti-flow baffle 5 to open to a certain width and unfold to a certain angle in its natural state to accept the buoyancy of the pile concrete. The outer wall of the sleeve 51 is welded with 90° limiting angle plates above the three fan-shaped baffles 52. When the concrete is poured, the anti-flow baffle can be opened automatically by relying on the buoyancy of the concrete. After unfolding, the anti-flow baffle is in a horizontal position and perpendicular to the pile hole. The diameter of the anti-flow baffle 5 after unfolding is slightly smaller than the diameter of the pile hole to facilitate the discharge of mud. Pull rings 53 are welded on the anti-flow baffle 5 and tied to the ground with steel wire ropes for manual assistance in opening the anti-flow baffle.

[0032] S5. Construction of one column and one pile: Pile foundation construction process: Pile foundation measurement and positioning → Installation of casing → Injection of mud → Pile foundation positioning (reinforcing cage fabrication) → Drilling → Continue drilling → Slag removal → Hole cleaning → Placement of temporary platform → Lifting of reinforcing cage → Lifting of steel pipe column → Adjustment of plumbness → Insertion of concrete guide pipe → Second cleaning → Pouring of pile body concrete → Replacing with high-grade concrete to pour steel pipe column concrete → Second adjustment of plumbness after pouring → Post-grouting at pile end → Pile foundation inspection.

[0033] S6. Removal of extension pipe: 48 hours after the pile foundation is completed, remove extension pipe 3 and turnover platform 1 for turnover construction. Backfill the steel pipe column 2 and pile hole directly with sand and gravel to ensure the verticality of the steel pipe column.

[0034] S7. Remove laitance from steel pipe columns and pile bodies: First, during the construction of the structural B0 slab, cut off the inner lining pipe at the top of the steel pipe column and remove the laitance inside the steel pipe column to ensure the concrete strength of the steel pipe column and reliable connection with the first-floor column. During the construction of the base slab, remove the laitance between the anti-flow baffle 5 and the designed pile top to ensure the concrete strength of the pile top, the quality of the embedded section of the steel pipe column, and reliable connection between the pile body and the base slab.

[0035] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structures made using the contents of the present invention specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of the present invention.

Claims

1. A construction method for controlling the over-grouting height of a single-column, single-pile structure using a reverse construction method, characterized in that, Includes the following steps: S1. Construction of a turnover platform: A turnover platform is constructed to reinforce the soil at the opening of a pile hole; the turnover platform includes an inner circular steel ring and an outer square channel steel edging. The diameter of the circular steel ring is slightly larger than the diameter of the casing. The circular steel ring and the square channel steel edging are connected and fixed with steel profiles. The remaining part is tied with steel bars and then poured with concrete. S2. Fabrication of extension pipes: Some time before the construction of each column and pile, the steel pipe column is detailed. The extension pipe is detailed according to the diameter of the steel pipe column. The length of the extension pipe is determined according to the height from the design top elevation of the steel pipe column to the ground and the length of the sag section. The quantity is determined according to the number of steel pipe columns to ensure that it can be reused. The material and wall thickness of the extension pipe are the same as those of the steel pipe column. The extension pipe is connected to the steel pipe column by flange bolts. At the connection point of the extension pipe, one diameter above the steel pipe column, overflow holes are symmetrically left on both sides. During grouting, excess concrete flows out through the overflow holes to ensure that the extension pipe can be reused. S3. Processing the inner lining pipe: After the steel pipe column is processed, the inner lining pipe is welded at the designed top elevation of the steel pipe column; S4. Construction anti-flow baffle: Based on the embedment length of the steel pipe column into the pile body, an anti-flow baffle is installed on the steel pipe column at a distance equal to one pile diameter above the design elevation of the pile top; the anti-flow baffle includes a sleeve, which is welded to the steel pipe column. Three fan-shaped baffles are hinged to the outer end of the sleeve. A 45° limiting angle plate is welded to the outer wall of the sleeve below the three fan-shaped baffles, and a 90° limiting angle plate is welded to the outer wall of the sleeve above the three fan-shaped baffles; S5. Construction of one column and one pile: Pile foundation construction process, pile foundation measurement and positioning → installation of casing → injection of mud → pile foundation positioning → drilling → continued drilling → slag removal → hole cleaning → placement of turnover platform → hoisting of steel cage → hoisting of steel pipe column → vertical adjustment → insertion of concrete guide pipe → second cleaning → pouring of pile body concrete → replacing with high-grade concrete to pour steel pipe column concrete → second vertical adjustment after pouring → post-grouting of pile end → pile foundation inspection. S6. Removal of extension pipe: After the pile foundation has been in place for a period of time, the extension pipe and turnover platform are removed and turnover construction is carried out. The steel pipe column and the pile hole are directly backfilled with sand and gravel to ensure the verticality of the steel pipe column. S7. Remove laitance from steel pipe columns and pile bodies: First, during the construction of the structural B0 slab, cut off the inner lining pipe at the top of the steel pipe column and remove the laitance inside the steel pipe column to ensure the concrete strength of the steel pipe column and reliable connection with the first-floor column. During the construction of the base slab, remove the laitance between the anti-flow baffle and the designed pile top to ensure the concrete strength of the pile top, the quality of the embedded section of the steel pipe column, and reliable connection between the pile body and the base slab.

2. The construction method for controlling the over-grouting height of one column and one pile using the reverse construction method as described in claim 1, characterized in that, In S3, the inner lining tube has a wall thickness of 5 mm, a length that is twice the diameter of the steel pipe column, and a diameter that is 20 mm smaller than the inner diameter of the steel pipe column.

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