Construction method for one-time forming of cast-in-place pile

Abstract

The invention discloses a construction method for one-time forming of a cast-in-place pile, which comprises the following steps of: S1, manufacturing combined steel templates with different lengths in sections, welding an operation platform and a steel pipe handrail on the top surface of the combined steel template for manually pouring concrete, and welding a bracket on the back surface by using channel steel for placing on the ground; s2, after secondary hole cleaning of the cast-in-place pile is finished, the combined steel formworks are connected through bolts at hole openings, and assembly forming is conducted; s3, workers are matched with a truck crane to splice and place all sections of concrete pouring guide pipes on the operation platform, and all the sections of guide pipes are fixed to the operation platform one by one till the sections of guide pipes are placed at the positions 0.4 m away from the hole bottom; and S4, cast-in-place pile concrete is poured, meanwhile, according to the pouring height, the guide pipe is continuously pulled out and dismantled, and the operation platform is also used for fixing, pulling out one section and dismantling one section till the concrete is poured to the top face of the combined steel formwork. Joints of the cast-in-place pile can be eliminated, and the integrity and perpendicularity of the cast-in-place pile are improved.

Description

Technical Field

[0001] The invention relates to a construction method for one-step forming of cast-in-place piles. Background Art

[0002] Applied in the maritime workboat wharf project, the project approach bridge has 12 φ800 cast-in-place piles with lengths of 50m and 52m, and the maximum length exposed above the ground is 3.9m. If the pile connection process is adopted, it will have an adverse effect on the verticality of the pile body and the durability of the joints. Innovative cast-in-place pile construction technology is needed to effectively improve the quality of cast-in-place piles.

[0003] Therefore, a construction method for one-step forming of cast-in-place piles is provided. Summary of the invention

[0004] The purpose of the present invention is to overcome the existing defects and provide a construction method for one-time forming of cast-in-place piles, which can eliminate the joints of cast-in-place piles, improve the integrity and verticality of cast-in-place piles, and significantly enhance the bearing capacity and durability of cast-in-place piles.

[0005] The technical solution to achieve the above purpose is:

[0006] A construction method for one-step forming of cast-in-place piles, comprising:

[0007] Step S1, manufacturing combined steel formworks of different lengths in sections, and welding an operating platform and a steel pipe railing on the top surface of the combined steel formwork for workers to pour concrete, and welding a bracket with a channel steel on the back surface for placement on the ground;

[0008] Step S2, after the secondary hole cleaning of the bored pile is completed, the combined steel formwork is connected at the hole mouth with bolts to assemble into shape;

[0009] Step S3, the worker cooperates with the truck crane on the operating platform to assemble and place each section of the concrete pouring conduit, and fixes each section of the conduit one by one on the operating platform until it is placed 0.4m away from the bottom of the hole;

[0010] Step S4, pouring cast-in-place pile concrete, and at the same time, continuously pulling out and removing the conduit according to the pouring height, and also using the operating platform to fix it, pulling out one section and removing one section, until the concrete is poured to the top surface of the combined steel formwork;

[0011] Step S5, after the concrete strength reaches the design specified demolding strength, loosen the bolts and remove the combined steel formwork to both sides using a truck crane;

[0012] Step S6, placing the combined steel formwork on the floor of the cleaning area, cleaning, oiling, and covering the inner surface of the combined steel formwork for next use;

[0013] Step S7, finally chiseling away the concrete within 1 m of the pile top.

[0014] Preferably, in step S2, the combined steel formwork is connected at the hole opening with bolts and assembled into shape, and the elevation of the combined steel formwork is 1 m higher than the top pile.

[0015] Preferably, in step S7, the concrete within 1 m of the pile top is chiseled out by ring cutting method.

[0016] The beneficial effects of the present invention are:

[0017] 1) The present invention can make the bored pile cast in one time, eliminate the joints of the bored pile, ensure the integrity of the bored pile, significantly improve the bearing capacity of the bored pile, and eliminate the hidden danger of poor impermeability at the joints of the bored pile, effectively improving the durability of the bored pile;

[0018] 2) The present invention can form the bored pile in one casting operation, thus reducing the number of pile connection procedures and improving the construction efficiency of the bored pile;

[0019] 3) The present invention can form the bored pile in one casting process, eliminating the hidden danger of large vertical deviation of the bored pile during the pile connection process;

[0020] 4) The present invention adopts a steel formwork, which effectively improves the visual quality of the part of the bored pile exposed above the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of a construction method for one-step forming of cast-in-place piles according to the present invention;

[0022] Figure 2 It is a top exploded view of the combined steel formwork welding operation platform and the steel pipe railing in the present invention;

[0023] Figure 3 It is a side exploded view of the combined steel formwork welding operation platform and the steel pipe railing in the present invention;

[0024] Figure 4 It is a top view of the combined steel template welding operation platform and the steel pipe railing in the present invention;

[0025] Figure 5 It is a side view of the combined steel formwork welding operation platform and the steel pipe railing in the present invention. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] like Figure 1 As shown, a construction method for one-step forming of cast-in-place piles comprises:

[0029] Step S1, make the combined steel formwork 1 of different lengths in sections, and weld the operating platform 2 and the steel pipe railing 3 on the top surface of the combined steel formwork 1 for workers to pour concrete, and weld the bracket with the channel steel 4 on the back to place it on the ground, such as Figure 2-5 shown.

[0030] Step S2, after the secondary cleaning of the bored pile is completed, the combined steel template 1 is connected at the hole mouth with bolts 5 to assemble the formed part. Figure 5 shown.

[0031] In the embodiment, the combined steel formwork 1 is connected at the hole with bolts 5 and assembled into a shape, and the elevation of the combined steel formwork 1 is 1m higher than the top pile.

[0032] In step S3, workers cooperate with the truck crane on the operating platform 2 to assemble and place each section of the concrete pouring conduit, and fix each section of the conduit on the operating platform 2 one by one until it is placed 0.4m away from the bottom of the hole.

[0033] Step S4, pouring cast-in-place pile concrete, and at the same time, continuously pulling out and removing the conduit according to the pouring height, and also using the operating platform 2 to fix it, pulling out one section and removing one section until the concrete is poured to the top surface of the combined steel formwork 1.

[0034] Step S5, after the concrete strength reaches the design specified demolding strength, loosen the bolts 5 and remove the combined steel formwork 1 to both sides using a truck crane.

[0035] Step S6, placing the combined steel formwork 1 on the floor of the cleaning area, cleaning, oiling and covering the inner surface of the combined steel formwork 1 for next use.

[0036] Step S7, finally chiseling away the concrete within 1 m of the pile top.

[0037] In the embodiment, the concrete within 1 m of the pile top is chiseled out by the ring cutting method.

[0038] The invention can form the bored pile in one casting operation, eliminate the joints of the bored pile, ensure the integrity of the bored pile, significantly improve the bearing capacity of the bored pile, eliminate the hidden danger of poor impermeability at the joints of the bored pile, and effectively improve the durability of the bored pile.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for one-step forming of cast-in-place piles, characterized in that: include: Step S1, manufacturing combined steel formwork (1) of different lengths in sections, and welding an operating platform (2) and a steel pipe railing (3) on the top surface of the combined steel formwork (1) for workers to pour concrete, and welding a bracket with a channel steel (4) on the back surface for placement on the ground; Step S2, after the secondary cleaning of the bored pile is completed, the combined steel formwork (1) is connected at the hole mouth with bolts (5) to assemble into shape; Step S3, workers cooperate with the truck crane to assemble and place each section of the concrete pouring conduit on the operating platform (2), and fix each section of the conduit on the operating platform (2) one by one until it is placed 0.4 m from the bottom of the hole; Step S4, pouring cast-in-place pile concrete, and at the same time, continuously pulling out and removing the guide tube according to the pouring height, and also using the operating platform (2) to fix it, pulling out one section and removing one section, until the concrete is poured to the top surface of the combined steel formwork (1); Step S5, after the concrete strength reaches the design specified demolding strength, loosen the bolts (5) and remove the combined steel formwork (1) to both sides using a truck crane; Step S6, placing the combined steel formwork (1) on the floor of the cleaning area, cleaning, oiling and covering the inner surface of the combined steel formwork (1) for next use; Step S7, finally chiseling away the concrete within 1 m of the pile top.

2. A method for preparing largemouth bass feed according to claim 1, characterized in that: In the step S2, the combined steel formwork (1) is connected at the hole opening with bolts to assemble the combined steel formwork (1), and the height of the combined steel formwork (1) is 1m higher than the top pile.

3. A method for preparing largemouth bass feed according to claim 2, characterized in that: In step S7, the concrete within 1 m of the pile top is chiseled out by the ring cutting method.

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