A steel mesh construction method suitable for large diameter pile foundation

Abstract

This invention provides a method for constructing large-diameter pile foundations using a mesh-based reinforcement system. Relating to the field of foundation reinforcement construction, this invention divides the structure of the foundation reinforcement segments into multiple independent foundation reinforcement and bracing mechanisms. Each foundation reinforcement mechanism includes inner and outer layers of opposing reinforcement meshes. This mesh-based construction not only reduces hoisting weight but also ensures high installation accuracy, greater flexibility in on-site construction, and enhanced error correction capabilities. Because the optimized design of the foundation reinforcement structure utilizes mesh-based construction and optimizes the connection relationships between the various mesh structures, the on-site hoisting weight is reduced, the overall construction difficulty is lower, and the construction period is significantly shortened. This invention's construction method uses conventional equipment and materials, can be flexibly applied to the construction of large-diameter pile foundations, saves costs, and is worthy of widespread promotion.

Description

Technical Field

[0001] The invention relates to the field of foundation steel bar construction, and in particular to a steel bar mesh construction method suitable for large-diameter pile foundations. Background Art

[0002] Conventional pile foundations are usually made by manual excavation or mechanical construction, and then the steel cage is placed and concrete is poured on site. The diameter of this type of pile foundation is generally 800~2000mm. The pile foundation steel cage is generally manufactured in whole or in sections on a special jig or stand in the steel bar factory according to the equipment lifting capacity. After production, it is transported to the site and hoisted into the hole by a crane. For the steel cage made in sections, the first section is temporarily supported on the hole steel after entering the hole, and then the second section is hoisted to connect with it, and then the steel is pulled out and the steel cage is lowered, and the cycle is repeated until it reaches the designed elevation.

[0003] For large-diameter pile foundations, if conventional pile foundation reinforcement cage construction methods are used, many problems will arise in the actual on-site construction:

[0004] (1) The lifting weight is too large. In order to prevent the complicated construction caused by too many sections, the performance of the lifting machinery will be improved accordingly, and the difficulty of on-site lifting construction will be greatly increased;

[0005] (2) The rigidity of the large-diameter steel cage is also problematic. In order to reduce deformation during transportation, more internal support steel bars need to be temporarily added, which increases the construction cost.

[0006] (3) The production and installation of large-diameter steel cages in a whole circle greatly increases the requirements for steel mills and frames. In addition, many construction access roads do not meet the transportation requirements, making it extremely difficult to transport the steel cages to the hole locations.

[0007] Therefore, how to solve the above problems has become an urgent problem to be solved in this field. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a mesh construction method for large-diameter pile foundation steel bars. Since the foundation steel bar structure is optimized and designed using mesh construction, and the connection relationship between each mesh structure is optimized, the on-site lifting weight is small, the overall construction difficulty is small, and the construction period is greatly shortened.

[0009] The present invention is achieved through the following technical solutions:

[0010] A method for constructing a steel mesh for a large-diameter pile foundation, comprising the following steps:

[0011] Step 1, dividing the foundation steel bar segments into multiple segments according to the structure of the large-diameter pile foundation steel bar;

[0012] Step 2, dividing a plurality of independent foundation reinforcement mechanisms and bracing mechanisms according to the structure of the foundation reinforcement segment: the bracing mechanism is arranged inside the foundation reinforcement mechanism and is used to connect the foundation reinforcement mechanism horizontally or vertically, the foundation reinforcement mechanism includes an inner layer reinforcement mesh and an outer layer reinforcement mesh arranged relatively inside and outside, the inner layer reinforcement mesh includes a plurality of groups of inner layer vertical main reinforcements arranged vertically and a plurality of groups of inner layer stirrups arranged horizontally at intervals, and the outer layer reinforcement mesh includes a plurality of groups of outer layer vertical main reinforcements arranged vertically and a plurality of groups of outer layer stirrups arranged horizontally at intervals;

[0013] Step 3, making the inner layer steel mesh and the outer layer steel mesh: according to the divided inner layer steel mesh and the outer layer steel mesh, the cutting is completed, the threading is processed on the steel threading machine, the inner layer vertical main reinforcement and the inner layer stirrup of the inner layer steel mesh are intermittently welded and temporarily tied in sequence, and the outer layer vertical main reinforcement and the outer layer stirrup of the outer layer steel mesh are intermittently welded and temporarily tied in sequence;

[0014] In step 4, the inner layer steel mesh and the outer layer steel mesh produced in step 3 are pre-assembled on the tire frame. When the inner layer vertical main reinforcement and the outer layer vertical main reinforcement are successfully connected with the inner layer vertical main reinforcement and the outer layer vertical main reinforcement corresponding to the previous segment foundation steel segment through the straight threaded sleeve, the connection of the straight threaded sleeve is released, and the inner layer steel mesh and the outer layer steel mesh are transported to the construction site;

[0015] Step 5, installation at the construction site: After the excavation of the pile foundation at the construction site is completed, a single set of outer steel mesh or inner steel mesh is hoisted by a truck crane, and overlapped with the outer steel mesh or inner steel mesh of the previous section of the foundation steel bar section, and the outer steel mesh or inner steel mesh is hoisted one by one in the same direction to complete the assembly and overlap;

[0016] Step 6: Assemble the bracing mechanism from bottom to top, wherein the bracing mechanism includes a plurality of groups of vertically arranged horizontal X-direction bracing bars and Y-direction bracing bars, and both ends of the X-direction bracing bars and Y-direction bracing bars are tied and fixedly connected to the inner layer steel mesh or the outer layer steel mesh.

[0017] It can be seen that in the above technical scheme, the present invention divides the structure of the foundation steel bar segment into multiple groups of independent foundation steel bar mechanisms and bracing bar mechanisms, and the foundation steel bar mechanism includes an inner steel mesh and an outer steel mesh that are relatively arranged inside and outside. This mesh construction can not only reduce the weight of the hoisting, but also has high installation accuracy, more flexible on-site construction, and enhanced error correction capabilities; because the foundation steel bar structure optimization design adopts mesh construction, and the connection relationship between each mesh structure is optimized, the on-site hoisting weight is small, the overall construction difficulty is small, and the construction period is greatly shortened; the construction method of the present invention adopts conventional equipment and materials, and is flexibly applied to the construction of large-diameter pile foundations, saving costs, and is worthy of promotion.

[0018] According to the above technical solution, preferably, step 3 specifically includes the following steps:

[0019] Step 3.1, cutting of the inner layer steel mesh and the outer layer steel mesh is completed according to the division;

[0020] Step 3.2, the inner vertical main reinforcement is connected to the inner stirrups of the odd-numbered layers by welding, while the inner vertical main reinforcement is connected to the inner stirrups of the even-numbered layers by temporary binding;

[0021] Step 3.3: The outer vertical main reinforcement is connected to the outer stirrups of the odd-numbered layers by welding, while the outer vertical main reinforcement is connected to the outer stirrups of the even-numbered layers by temporary binding.

[0022] It can be seen that in the above technical solution, in order to meet the overall strength requirements of the large-diameter pile foundation steel bars, the inner and outer stirrups of the even-numbered layers need to be horizontally rotated by half the width of the corresponding mesh after being hoisted into place. After the lap length is met, the horizontally adjacent inner or outer stirrups are welded and connected.

[0023] According to the above technical solution, preferably, step 5 specifically includes the following steps:

[0024] Step 5.1, use a truck crane to hoist a single set of outer steel mesh to the opening of the pile foundation, and connect the outer vertical main reinforcement of the outer steel mesh with the outer vertical main reinforcement of the previous section through a straight threaded sleeve;

[0025] Step 5.2, untie the outer stirrups of temporary binding construction, and move this part of the outer stirrups horizontally to half the width of the outer steel mesh. After the overlap length is met, weld the horizontally adjacent outer stirrups together;

[0026] Step 5.3: Use a truck crane to hoist a single set of inner steel mesh to the opening of the pile foundation, and connect the inner vertical main reinforcement of the inner steel mesh with the inner vertical main reinforcement of the previous section through a straight threaded sleeve;

[0027] Step 5.4, untie the inner stirrups of temporary binding construction, and move this part of the inner stirrups horizontally by half the width of the inner steel mesh. After the overlap length is met, weld the horizontally adjacent inner stirrups together;

[0028] Step 5.5: Repeat steps 5.1 to 5.4 in sequence, and complete the assembly and overlap of the outer steel mesh or the inner steel mesh one by one in the same direction.

[0029] According to the above technical solution, preferably, the foundation steel bar segment also includes a steel section mechanism buried in the pile foundation, the steel section mechanism is arranged in the middle of the foundation steel bar segment, the steel section mechanism includes a plurality of groups of vertically arranged steel section units, and the steel section units are used as a construction scaffolding of the foundation steel bar mechanism and a positioning bracket of the bracing mechanism.

[0030] According to the above technical solution, preferably, when making the inner steel mesh and the outer steel mesh, the inner vertical main reinforcement and the outer vertical main reinforcement located at both ends and the middle of the inner steel mesh and the outer steel mesh are reserved for installation and are not assembled.

[0031] It can be seen that in the above technical solution, the inner vertical main reinforcement and the outer vertical main reinforcement located at both ends and the middle of the inner steel mesh and the outer steel mesh are reserved for installation and are not assembled. In order to facilitate the horizontal movement of the inner stirrups or the outer stirrups into place, sufficient space is left to complete the butt welding operation, and then the inner vertical main reinforcement and the outer vertical main reinforcement are assembled.

[0032] The beneficial effects of the present invention are:

[0033] (1) The present invention divides the structure of the foundation steel bar segment into multiple groups of independent foundation steel bar mechanisms and bracing bar mechanisms, and the foundation steel bar mechanism includes an inner steel bar mesh and an outer steel bar mesh that are relatively arranged inside and outside. This mesh construction can not only reduce the weight of the hoisting, but also has high installation accuracy, more flexible on-site construction, and enhanced error correction capability;

[0034] (2) Since the optimized design of the foundation steel structure adopts mesh construction and the connection relationship between each mesh structure is optimized, the on-site hoisting weight is small, the overall construction difficulty is small, and the construction period is greatly shortened;

[0035] (3) The construction method of the present invention uses conventional equipment and materials and is flexibly applicable to the construction of large-diameter pile foundations, thereby saving construction costs and being worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of construction steps according to an embodiment of the present invention is shown;

[0037] Figure 2 A schematic top view of a basic steel bar segment according to an embodiment of the present invention is shown;

[0038] Figure 3 A schematic top view of multiple groups of basic steel bar mechanisms separated according to an embodiment of the present invention is shown;

[0039] Figure 4 A schematic top view of a basic steel bar mechanism according to an embodiment of the present invention is shown;

[0040] Description of reference numerals:

[0041] 1. Foundation steel bar segment; 2. Foundation steel bar structure; 3. Support bar structure; 4. Inner steel mesh; 5. Outer steel mesh; 6. Inner vertical main bars; 7. Inner stirrups; 8. Outer vertical main bars; 9. Outer stirrups; 10. X-direction support bars; 11. Y-direction support bars; 12. Pile foundation opening; 13. Steel section unit. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiment. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the invention.

[0043] In the description of the invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the 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. Therefore, they cannot be understood as limitations on the invention.

[0044] As shown in the figure, the present invention provides a steel mesh construction method applicable to large-diameter pile foundations, comprising the following steps:

[0045] Step 1, dividing the foundation steel bar segment 1 into multiple segments according to the structure of the large-diameter pile foundation steel bar;

[0046] Step 2, dividing a plurality of independent foundation reinforcement mechanisms 2 and bracing mechanisms 3 according to the structure of the foundation reinforcement segment 1: the bracing mechanism 3 is arranged inside the foundation reinforcement mechanism 2 and is used to connect the foundation reinforcement mechanism 2 horizontally or vertically, the foundation reinforcement mechanism 2 includes an inner layer reinforcement mesh 4 and an outer layer reinforcement mesh 5 which are relatively arranged inside and outside, the inner layer reinforcement mesh 4 includes a plurality of groups of inner layer vertical main reinforcements 6 which are arranged vertically and a plurality of groups of inner layer stirrups 7 which are arranged horizontally at intervals, and the outer layer reinforcement mesh 5 includes a plurality of groups of outer layer vertical main reinforcements 8 which are arranged vertically and a plurality of groups of outer layer stirrups 9 which are arranged horizontally at intervals;

[0047] Step 3, making the inner steel mesh 4 and the outer steel mesh 5: the inner steel mesh 4 and the outer steel mesh 5 are cut according to the division, and the threading process is performed on the steel threading machine. The inner vertical main reinforcement 6 and the inner stirrup 7 of the inner steel mesh 4 are intermittently welded and temporarily tied in sequence, and the outer vertical main reinforcement 8 and the outer stirrup 9 of the outer steel mesh 5 are intermittently welded and temporarily tied in sequence;

[0048] Step 3 specifically includes the following steps:

[0049] Step 3.1, cutting of the divided inner layer steel mesh 4 and outer layer steel mesh 5 is completed;

[0050] Step 3.2, the inner vertical main reinforcement 6 is connected to the inner stirrups 7 of the odd-numbered layers by welding, while the inner vertical main reinforcement 6 is connected to the inner stirrups 7 of the even-numbered layers by temporary binding;

[0051] Step 3.3, the outer vertical main reinforcement 8 is connected to the outer stirrups 9 of the odd-numbered layers by welding, while the outer vertical main reinforcement 8 is connected to the outer stirrups 9 of the even-numbered layers by temporary binding;

[0052] In order to meet the overall strength requirements of the large-diameter pile foundation steel bars, the inner stirrups 7 and outer stirrups 9 of the even-numbered layers need to be horizontally rotated by half the width of the corresponding mesh after being hoisted in place. After the overlap length is met, the horizontally adjacent inner stirrups 7 or outer stirrups 9 are welded and connected;

[0053] In step 4, the inner layer steel mesh 4 and the outer layer steel mesh 5 made in step 3 are pre-assembled on the tire frame. When the inner layer vertical main reinforcement 6 and the outer layer vertical main reinforcement 8 are successfully connected with the inner layer vertical main reinforcement 6 and the outer layer vertical main reinforcement 8 corresponding to the previous segment foundation steel segment 1 through the straight threaded sleeve, the connection of the straight threaded sleeve is released, and the inner layer steel mesh 4 and the outer layer steel mesh 5 are transported to the construction site;

[0054] Step 5, installation at the construction site: after the excavation of the pile foundation at the construction site is completed, a single set of outer steel mesh 5 or inner steel mesh 4 is hoisted by a truck crane, and overlapped with the outer steel mesh 5 or inner steel mesh 4 of the previous segment foundation steel segment 1, and the outer steel mesh 5 or inner steel mesh 4 is hoisted one by one in the same direction to complete the assembly and overlap;

[0055] Step 5 specifically includes the following steps:

[0056] Step 5.1, using a truck crane to hoist a single set of outer steel mesh 5 to the pile foundation hole 12, and connecting the outer vertical main reinforcement 8 of the outer steel mesh 5 to the outer vertical main reinforcement 8 of the previous section through a straight threaded sleeve;

[0057] Step 5.2, untie the outer stirrups 9 of temporary binding construction, and move this part of the outer stirrups 9 horizontally to half the width of the outer steel mesh 5. After the overlap length is met, the horizontally adjacent outer stirrups 9 are welded and connected;

[0058] Step 5.3, using a truck crane to hoist a single set of inner steel mesh 4 to the pile foundation hole 12, and the inner vertical main reinforcement 6 of the inner steel mesh 4 is connected to the inner vertical main reinforcement 6 of the previous section through a straight threaded sleeve;

[0059] Step 5.4, untie the inner stirrups 7 of temporary binding construction, and move this part of the inner stirrups 7 horizontally to half the width of the inner steel mesh 4. After the overlap length is met, weld the horizontally adjacent inner stirrups 7 together;

[0060] Step 5.5, repeating steps 5.1 to 5.4 in sequence, and assembling and overlapping the outer steel mesh 5 or the inner steel mesh 4 one by one in the same direction;

[0061] Step 6, assemble the bracing mechanism 3 from bottom to top, the bracing mechanism 3 includes multiple groups of vertically arranged horizontal X-direction bracing bars 10 and Y-direction bracing bars 11, and the two ends of the X-direction bracing bars 10 and Y-direction bracing bars 11 are tied and fixedly connected to the inner steel mesh 4 or the outer steel mesh 5.

[0062] The present invention divides the structure of the foundation steel bar segment 1 into multiple groups of independent foundation steel bar mechanisms 2 and bracing bar mechanisms 3, and the foundation steel bar mechanism 2 includes an inner steel mesh 4 and an outer steel mesh 5 that are relatively arranged inside and outside. This mesh construction can not only reduce the weight of the hoisting, but also has high installation accuracy, more flexible on-site construction, and enhanced error correction capability; since the foundation steel bar structure optimization design adopts mesh construction, and the connection relationship between each mesh structure is optimized, the on-site hoisting weight is small, the overall construction difficulty is small, and the construction period is greatly shortened; the construction method of the present invention adopts conventional equipment and materials, and is flexibly applied to the construction of large-diameter pile foundations, saving costs, and is worthy of promotion.

[0063] Optionally, in a possible embodiment, the foundation steel bar segment 1 also includes a steel structure buried in the pile foundation, the steel structure is arranged in the middle of the foundation steel bar segment 1, and the steel structure includes a plurality of groups of vertically arranged steel units 13, and the steel unit 13 is used as a construction scaffolding of the foundation steel bar mechanism 2 and a positioning bracket of the bracing mechanism 3.

[0064] Optionally, in a possible embodiment, when the inner steel mesh 4 and the outer steel mesh 5 are manufactured, the inner vertical main reinforcement 6 and the outer vertical main reinforcement 8 located at both ends and the middle of the inner steel mesh 4 and the outer steel mesh 5 are reserved for installation and are not assembled. In order to facilitate the horizontal movement of the inner stirrups 7 or the outer stirrups 9 into place, sufficient space is left to complete the butt welding operation, and then the inner vertical main reinforcement 6 and the outer vertical main reinforcement 8 in the reserved space are assembled.

[0065] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for constructing steel mesh for large-diameter pile foundations, characterized in that: The following steps are involved: Step 1, dividing the foundation steel bar segments into multiple segments according to the structure of the large-diameter pile foundation steel bar; Step 2, dividing a plurality of independent foundation reinforcement mechanisms and bracing mechanisms according to the structure of the foundation reinforcement segment: the bracing mechanism is arranged inside the foundation reinforcement mechanism and is used to connect the foundation reinforcement mechanism horizontally or vertically, the foundation reinforcement mechanism includes an inner layer reinforcement mesh and an outer layer reinforcement mesh arranged relatively inside and outside, the inner layer reinforcement mesh includes a plurality of groups of inner layer vertical main reinforcements arranged vertically and a plurality of groups of inner layer stirrups arranged horizontally at intervals, and the outer layer reinforcement mesh includes a plurality of groups of outer layer vertical main reinforcements arranged vertically and a plurality of groups of outer layer stirrups arranged horizontally at intervals; Step 3, making the inner layer steel mesh and the outer layer steel mesh: according to the divided inner layer steel mesh and the outer layer steel mesh, the cutting is completed, the threading is processed on the steel threading machine, the inner layer vertical main reinforcement and the inner layer stirrup of the inner layer steel mesh are intermittently welded and temporarily tied in sequence, and the outer layer vertical main reinforcement and the outer layer stirrup of the outer layer steel mesh are intermittently welded and temporarily tied in sequence; In step 4, the inner layer steel mesh and the outer layer steel mesh produced in step 3 are pre-assembled on the tire frame. When the inner layer vertical main reinforcement and the outer layer vertical main reinforcement are successfully connected with the inner layer vertical main reinforcement and the outer layer vertical main reinforcement corresponding to the previous segment foundation steel segment through the straight threaded sleeve, the connection of the straight threaded sleeve is released, and the inner layer steel mesh and the outer layer steel mesh are transported to the construction site; Step 5, installation at the construction site: After the excavation of the pile foundation at the construction site is completed, a single set of outer steel mesh or inner steel mesh is hoisted by a truck crane, and overlapped with the outer steel mesh or inner steel mesh of the previous section of the foundation steel bar section, and the outer steel mesh or inner steel mesh is hoisted one by one in the same direction to complete the assembly and overlap; Step 6: Assemble the bracing mechanism from bottom to top, wherein the bracing mechanism includes a plurality of groups of vertically arranged horizontal X-direction bracing bars and Y-direction bracing bars, and both ends of the X-direction bracing bars and Y-direction bracing bars are tied and fixedly connected to the inner layer steel mesh or the outer layer steel mesh.

2. A method for constructing steel mesh for large-diameter pile foundations according to claim 1, characterized in that: Step 3 specifically includes the following steps: Step 3.1, cutting of the inner layer steel mesh and the outer layer steel mesh is completed according to the division; Step 3.2, the inner vertical main reinforcement is connected to the inner stirrups of the odd-numbered layers by welding, while the inner vertical main reinforcement is connected to the inner stirrups of the even-numbered layers by temporary binding; Step 3.3: The outer vertical main reinforcement is connected to the outer stirrups of the odd-numbered layers by welding, while the outer vertical main reinforcement is connected to the outer stirrups of the even-numbered layers by temporary binding.

3. A method for constructing steel mesh for large-diameter pile foundations according to claim 1, characterized in that: Step 5 specifically includes the following steps: Step 5.1, use a truck crane to hoist a single set of outer steel mesh to the opening of the pile foundation, and connect the outer vertical main reinforcement of the outer steel mesh with the outer vertical main reinforcement of the previous section through a straight threaded sleeve; Step 5.2, untie the outer stirrups of temporary binding construction, and move this part of the outer stirrups horizontally to half the width of the outer steel mesh. After the overlap length is met, weld the horizontally adjacent outer stirrups together; Step 5.3: Use a truck crane to hoist a single set of inner steel mesh to the opening of the pile foundation, and connect the inner vertical main reinforcement of the inner steel mesh with the inner vertical main reinforcement of the previous section through a straight threaded sleeve; Step 5.4, untie the inner stirrups of temporary binding construction, and move this part of the inner stirrups horizontally by half the width of the inner steel mesh. After the overlap length is met, weld the horizontally adjacent inner stirrups together; Step 5.5: Repeat steps 5.1 to 5.4 in sequence, and complete the assembly and overlap of the outer steel mesh or the inner steel mesh one by one in the same direction.

4. A method for constructing steel mesh for large-diameter pile foundations according to claim 1, characterized in that: The foundation steel bar segment also includes a steel structure buried in the pile foundation, which is arranged in the middle of the foundation steel bar segment. The steel structure includes multiple groups of vertically arranged steel units, which are used as construction scaffolding for the foundation steel bar structure and positioning brackets for the bracing mechanism.

5. The method for constructing a steel mesh for a large-diameter pile foundation according to claim 1, characterized in that: When making the inner steel mesh and the outer steel mesh, the inner vertical main reinforcement and the outer vertical main reinforcement located at both ends and the middle of the inner steel mesh and the outer steel mesh are reserved for installation and are not assembled.

Images