Method for adopting semi-assembly type foundation as CAS foundation

Abstract

The invention provides a method for adopting a semi-fabricated foundation as a CAS foundation, and relates to the technical field of construction reinforcement, and the method comprises the following steps: according to a design drawing, pre-processing and welding angle steel to form a stable truss structure as a skeleton of a steel bar net rack; in a manufacturing site, a steel bar net rack for welding the CAS foundation is manufactured and fixedly welded with the prefabricated framework, and a complete reinforced net rack structure is formed; a hoisting point is arranged on the reinforced grid structure; the prefabricated reinforced grid structure is hoisted into a foundation pit dug in advance through a crown block; finely adjusting the position of the reinforced grid structure in the foundation pit; the reinforced net rack structure is manufactured on a manufacturing site in a mode of connecting and reinforcing the prefabricated steel bar net rack and the truss structure, the reinforced net rack structure is hoisted to the site through a travelling crane, foundation concrete pouring operation is only carried out on the site, semi-fabricated construction is completed, smooth implementation of a project is guaranteed, the construction period is greatly shortened, and efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction reinforcement, and in particular to a method for adopting a semi-assembled foundation for a CAS foundation. Background Art

[0002] Reinforced concrete foundation refers to the basic structure at the bottom of a building constructed on the ground or underground using reinforced concrete as the main material. It is used to bear the building load and transfer it to the foundation to ensure the stability and safety of the building. The use of steel grids in reinforced concrete foundations is to improve the bearing capacity and stability of the foundation. The steel grids can increase the number of steel bars in the concrete, thereby improving the bending, shear and bearing capacity of the entire foundation, effectively preventing deformation, cracking and other damage to the foundation, thereby ensuring the stability and safety of the building.

[0003] Existing large reinforced concrete foundations are large in size and require a long normal construction time. A molten steel tank passes by the construction area approximately every 20 minutes. Construction workers must leave the site in time before the arrival of the molten steel tank and return to the site after the molten steel tank passes. This prevents workers from continuing to work, greatly reducing construction efficiency. In addition, this large reinforced concrete foundation requires a large area of steel grid, which may fall apart, deform, and damage during the hoisting process. Therefore, the present invention proposes a CAS foundation method using a semi-assembled foundation to solve the problems existing in the prior art. Summary of the Invention

[0004] In response to the above problems, the present invention proposes a method for CAS foundation using a semi-assembled foundation. The CAS foundation adopts a semi-assembled foundation method, which uses prefabricated steel grids and truss structures to connect and reinforce the reinforced grid structure at the production site, and then hoisted it to the site by a crane. Only the foundation concrete pouring operation is carried out on site to complete the semi-assembled construction, ensure the smooth implementation of the project, greatly shorten the construction period, and improve efficiency.

[0005] To achieve the purpose of the present invention, the present invention is implemented through the following technical solution: a method for using a semi-assembled foundation for a CAS foundation, comprising the following steps:

[0006] S1: According to the design drawings, pre-process and weld angle steel to form a stable truss structure as the skeleton of the steel mesh;

[0007] S2: At the fabrication site, fabricate the welded steel grid for the CAS foundation and weld it to the prefabricated frame to form a complete reinforced grid structure;

[0008] S3: Setting the lifting points on the reinforced grid structure;

[0009] S4: Use an overhead crane to hoist the prefabricated reinforced grid structure into the pre-excavated foundation pit;

[0010] S5: Fine-tune the position of the reinforced grid structure in the foundation pit;

[0011] S6: Pour concrete around and above the reinforced grid structure until the design elevation is reached, completing the foundation construction.

[0012] A further improvement is that in S1, the truss structure includes a transverse frame assembly and a longitudinal frame assembly, and the transverse frame assembly and the longitudinal frame assembly are each provided with a plurality of groups, and the longitudinal frame assembly is connected between two adjacent groups of the transverse frame assemblies.

[0013] Further improvements are: the cross frame assembly includes a first angle steel, a second angle steel and a third angle steel, the first angle steel is provided with two upper and lower groups, the second angle steel and the third angle steel are provided with several groups, the second angle steel is connected between the upper and lower first angle steels, and the third angle steel is diagonally connected between adjacent second angle steels.

[0014] Further improvements are: the longitudinal frame assembly includes a fourth angle steel, a fifth angle steel and a sixth angle steel, the fourth angle steel is provided in two upper and lower groups, the fourth angle steel is connected between two adjacent groups of the first angle steels, the fifth angle steel is connected at the middle position between the upper and lower groups of the fourth angle steels, and the sixth angle steel is diagonally connected between the fifth angle steel and the second angle steel.

[0015] A further improvement is that the transverse frame assembly and the longitudinal frame assembly are both made of high-strength low-alloy steel.

[0016] A further improvement is that in said S2, when the steel mesh is welded and fixed to the prefabricated frame, the four sides of the steel mesh are bent to cover the side surfaces of the frame.

[0017] A further improvement is that in said S3, the lifting points provided on the reinforced grid structure adopt reinforced lifting rings or lifting ears.

[0018] A further improvement is that in S4, before hoisting, the foundation pit is cleaned and inspected to ensure that the size, depth and bottom flatness of the foundation pit meet the design requirements. After the reinforced grid structure is hoisted to the foundation pit, it is temporarily fixed using an adjustable support frame.

[0019] A further improvement is that in S6, before pouring concrete, a hidden engineering inspection is carried out on the steel grid to ensure that the position, quantity and welding quality of the steel bars meet the design requirements.

[0020] Further improvements are: when pouring concrete, adopt the method of layered pouring and vibrating to ensure the uniformity and density of the concrete. After pouring is completed, maintenance is carried out, including covering, moisturizing and temperature control, to promote the growth of concrete strength.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention adopts the method of prefabricated steel grid and truss structure connection reinforcement to manufacture the reinforced grid structure at the production site, which is hoisted to the site by a crane. Only the foundation concrete pouring operation is carried out on site to complete the semi-assembled construction, ensure the smooth implementation of the project, greatly shorten the construction period and improve efficiency.

[0023] 2. The steel mesh frame of the CAS foundation of the present invention is manufactured and welded at the production site, and a truss structure composed of angle steel is used as the skeleton of the steel mesh frame for reinforcement. After the reinforcement mesh structure is completed, it is hoisted to the foundation pit by an overhead crane. The overall structure is more solid and the hoisting is guaranteed, which effectively solves the problem of difficult construction of the CAS foundation in the complex environment of steelmaking and avoids the occurrence of disintegration, deformation and damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view of the reinforced grid structure of the present invention;

[0025] Figure 2 Schematic diagram of the truss structure of the present invention. DETAILED DESCRIPTION

[0026] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0027] Example 1

[0028] according to Figure 1 、 2 As shown, this embodiment proposes a method for using a semi-assembled foundation for a CAS foundation, comprising the following steps:

[0029] S1: According to the design drawings, pre-process and weld angle steel to form a stable truss structure as the skeleton of the steel mesh;

[0030] S2: At the fabrication site, fabricate the welded steel grid for the CAS foundation and weld it to the prefabricated frame to form a complete reinforced grid structure;

[0031] S3: Setting the lifting points on the reinforced grid structure;

[0032] S4: Use an overhead crane to hoist the prefabricated reinforced grid structure into the pre-excavated foundation pit;

[0033] S5: Fine-tune the position of the reinforced grid structure in the foundation pit;

[0034] S6: Pour concrete around and above the reinforced grid structure until the design elevation is reached, completing the foundation construction.

[0035] The use of a semi-fabricated foundation method, combining prefabricated angle steel trusses with on-site welded steel mesh, significantly improves construction efficiency and reduces labor intensity, while ensuring construction accuracy and quality. This method also reduces the amount of wet work on-site, contributing to environmental protection and safe production, and has high promotional value and application prospects. A truss structure composed of angle steel is used as the framework for the steel mesh for reinforcement. After the reinforced mesh structure is completed, it is hoisted into the foundation pit using an overhead crane, providing a more secure overall structure and ensuring a secure installation.

[0036] Example 2

[0037] according to Figure 1 、 2 As shown, this embodiment proposes a method for using a semi-assembled foundation for a CAS foundation, comprising the following steps:

[0038] According to the design drawings, angle steels are pre-processed and welded to form a stable truss structure as the skeleton of the steel mesh; the truss structure includes a horizontal frame assembly and a vertical frame assembly, and the horizontal frame assembly and the vertical frame assembly are each provided with several groups, and the vertical frame assembly is connected between two adjacent groups of the horizontal frame assemblies; the horizontal frame assembly includes a first angle steel, a second angle steel and a third angle steel, the first angle steel is provided with two upper and lower groups, the second angle steel and the third angle steel are each provided with several groups, the second angle steel is connected between the upper and lower first angle steels, and the third angle steel is diagonally connected between adjacent second angle steels; the vertical frame assembly includes a fourth angle steel, a fifth angle steel and a sixth angle steel, the fourth angle steel is provided with two upper and lower groups, the fourth angle steel is connected between two adjacent groups of the first angle steels, the fifth angle steel is connected at the middle position between the upper and lower groups of the fourth angle steels, and the sixth angle steel is diagonally connected between the fifth angle steel and the second angle steel; the horizontal frame assembly and the vertical frame assembly are both made of high-strength low-alloy steel.

[0039] At the fabrication site, a steel mesh is fabricated for the welded CAS foundation and welded to the prefabricated frame to form a complete reinforced mesh structure. When welding the mesh to the prefabricated frame, the four sides of the mesh are bent over to fold over the sides of the frame. Steel mesh is prefabricated based on the foundation dimensions and rebar layout. At the fabrication site, the prefabricated angle steel trusses are positioned according to the design. The steel mesh is placed on the angle steel trusses, ensuring that the connection points between the rebar and the trusses are accurately aligned. Automated or manual welding equipment is used to weld the rebar to the angle steel trusses. During the welding process, parameters such as welding current, voltage, and speed are controlled to ensure weld quality. Welds are polished and inspected as necessary to ensure a smooth and defect-free appearance. Additional steel bars are added to reinforce the mesh at key locations, such as stress concentration points and node connections. During the welding process, temporary support structures are used to support and secure the mesh to prevent deformation. After welding is complete, the support structures are removed, and the mesh undergoes a comprehensive quality inspection.

[0040] Lifting points are installed on the reinforced mesh structure; these lifting points utilize reinforced lifting rings or lugs. The location of these lifting points is determined based on the structural characteristics and center of gravity distribution of the steel mesh. Lifting points are located at or near the nodes of the steel mesh to ensure uniform force during lifting. The number of lifting points is determined based on the weight, size, and shape of the steel mesh. In terms of layout, the lifting points should be dispersed as much as possible to reduce the risk of excessive force at a single point. The lifting points are reinforced in design, using reinforcing plates and ribs to increase their load-bearing capacity. The connection points are welded or bolted to ensure a secure connection. According to design requirements, the reinforcing plates and ribs are welded to the corresponding locations of the steel mesh. During the welding process, the welding quality is controlled to ensure that the welds are free of defects. Lifting rings or lugs are installed on the reinforcing plates for connecting lifting ropes or hooks.

[0041] Use an overhead crane to hoist the prefabricated reinforced grid structure into the pre-excavated foundation pit. Before hoisting, clean and inspect the foundation pit to ensure that the size, depth, and bottom flatness of the pit meet the design requirements. After hoisting the reinforced grid structure into the foundation pit, use an adjustable support frame to temporarily fix it.

[0042] Fine-tune the position of the reinforcement grid structure within the foundation pit. Once the reinforcement grid structure has been successfully hoisted into the pit, it is immediately temporarily secured using adjustable support frames. Adjustable support frames are installed at key locations within the reinforcement grid structure, such as joints or areas subject to high loads. Adjust the height and position of the support frames based on the actual conditions of the reinforcement grid structure to ensure stable support. After installing the adjustable support frames, inspect the secure connection between the support frames and the reinforcement grid structure and verify their stability. Ensure that all support frames are in the correct position and height to provide sufficient support. After temporary securing, perform preliminary positioning of the reinforcement grid structure. This is accomplished by observing the relative position of the reinforcement grid structure to the pit edge. Use specialized adjustment tools or equipment to fine-tune the reinforcement grid structure. This includes adjusting its horizontal position, vertical height, and tilt angle. During fine-tuning, closely monitor the stability of the reinforcement grid structure to ensure it does not move or deform. At the same time, ensure that the fine-tuned reinforcement grid structure meets design requirements, including accurate positioning and levelness. After fine-tuning, conduct a comprehensive inspection of the reinforcement grid structure. This includes checking its levelness, verticality, and positional accuracy to ensure they meet design requirements. Ensure that all support frames are in the correct position and height and are securely connected.

[0043] Concrete is poured around and above the reinforced grid structure until it reaches the designed elevation, completing the foundation construction. Before pouring concrete, a hidden engineering inspection of the steel grid is conducted to ensure that the position, quantity, and welding quality of the steel bars meet design requirements. Concrete is poured in layers and compacted with vibration to ensure uniformity and density. After pouring, curing is carried out, including covering, moisture retention, and temperature control, to promote concrete strength growth. This method is suitable for all types of CAS foundation projects requiring rapid and high-quality construction, including but not limited to high-rise buildings, bridges, tunnels, and other infrastructure.

[0044] Concrete is poured in layers, with each layer thickness controlled within a certain range (no more than 50 cm) to ensure uniformity and density. During pouring, continue pouring continuously to avoid cold joints. Use an insert vibrator or flat vibrator to vibrate the concrete to expel air bubbles and achieve a dense state. Avoid direct contact between the vibrator and the rebar or reinforcement grid structure during vibrating to prevent damage. When pouring near the design elevation, use a scraper or trowel to smooth the concrete surface to ensure a smooth, even surface with no unevenness. After pouring, immediately cover the concrete to retain moisture. This can be achieved by laying plastic sheeting or wet sacks. This moisturizing method prevents rapid evaporation of moisture from the concrete surface, which can lead to shrinkage cracks. During curing, control the concrete temperature to avoid excessively high or low temperatures. In hot weather, implement cooling measures such as water spraying; in cold weather, implement heating and insulation measures. The curing period is typically determined based on the concrete's strength growth and should be no less than seven days. During the curing period, the concrete should be inspected regularly to ensure that its surface is moist and free of cracks.

[0045] The CAS foundation adopts the semi-assembled foundation method, which uses prefabricated steel grids and truss structures to connect and reinforce them. The reinforced grid structure is manufactured at the production site, hoisted to the site by a crane, and only the foundation concrete pouring operation is carried out on site to complete the semi-assembled construction, ensuring the smooth implementation of the project, greatly shortening the construction period, and improving efficiency. The steel grid of the CAS foundation is manufactured and welded at the production site, and a truss structure composed of angle steel is used as the skeleton of the steel grid for reinforcement. After the reinforcement grid structure is completed, it is hoisted to the foundation pit by an overhead crane. The overall structure is more solid and the hoisting is guaranteed, which effectively solves the problem of difficult construction of the CAS foundation in the complex environment of steelmaking, and avoids the occurrence of disintegration, deformation and damage.

[0046] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for using a semi-assembled foundation for a CAS foundation, characterized in that: The following steps are involved: S1: According to the design drawings, pre-process and weld angle steel to form a stable truss structure as the skeleton of the steel mesh; S2: At the fabrication site, fabricate and weld the steel grid for the CAS foundation, and weld and fix it to the prefabricated frame to form a complete reinforced grid structure; S3: Setting the lifting points on the reinforced grid structure; S4: Use an overhead crane to hoist the prefabricated reinforced grid structure into the pre-excavated foundation pit; S5: Fine-tune the position of the reinforced grid structure in the foundation pit; S6: Pour concrete around and above the reinforced grid structure until the design elevation is reached, completing the foundation construction.

2. The method of using a semi-assembled foundation for a CAS foundation according to claim 1, characterized in that: In S1, the truss structure includes a transverse frame assembly and a longitudinal frame assembly. The transverse frame assembly and the longitudinal frame assembly are each provided in a plurality of groups, and the longitudinal frame assembly is connected between two adjacent groups of the transverse frame assemblies.

3. The method of using a semi-assembled foundation for a CAS foundation according to claim 2, characterized in that: The cross frame assembly includes a first angle steel, a second angle steel and a third angle steel. The first angle steel is provided with two upper and lower groups, the second angle steel and the third angle steel are provided with several groups, the second angle steel is connected between the upper and lower first angle steels, and the third angle steel is obliquely connected between adjacent second angle steels.

4. The method of using a semi-assembled foundation for a CAS foundation according to claim 3, characterized in that: The longitudinal frame assembly includes a fourth angle steel, a fifth angle steel and a sixth angle steel. The fourth angle steel is provided in two upper and lower groups. The fourth angle steel is connected between two adjacent groups of the first angle steels. The fifth angle steel is connected at the middle position between the upper and lower groups of the fourth angle steels, and the sixth angle steel is obliquely connected between the fifth angle steel and the second angle steel.

5. The method of using a semi-assembled foundation for a CAS foundation according to claim 4, characterized in that: The transverse frame assembly and the longitudinal frame assembly are both made of high-strength low-alloy steel.

6. The method of using a semi-assembled foundation for a CAS foundation according to claim 1, characterized in that: In the above-mentioned S2, when the steel mesh frame is welded and fixed to the prefabricated frame, the four sides of the steel mesh frame are bent to cover the side surfaces of the frame.

7. The method of using a semi-assembled foundation for a CAS foundation according to claim 1, characterized in that: In said S3, the lifting points provided on the reinforced grid structure adopt reinforced lifting rings or lifting ears.

8. The method of using a semi-assembled foundation for a CAS foundation according to claim 1, characterized in that: In S4, before hoisting, the foundation pit is cleaned and inspected to ensure that the size, depth and bottom flatness of the foundation pit meet the design requirements. After the reinforced grid structure is hoisted to the foundation pit, it is temporarily fixed using an adjustable support frame.

9. The method of using a semi-assembled foundation for a CAS foundation according to claim 1, characterized in that: In S6, before pouring concrete, a hidden engineering inspection is performed on the steel grid to ensure that the position, quantity and welding quality of the steel bars meet the design requirements.

10. The method of using a semi-assembled foundation for a CAS foundation according to claim 9, characterized in that: When pouring concrete, the method of layered pouring and vibrating compaction is adopted to ensure the uniformity and density of the concrete. After pouring is completed, maintenance is carried out, including covering, moisturizing and temperature control, to promote the growth of concrete strength.

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