A self-locking assembled panel foundation

Abstract

This invention discloses a self-locking prefabricated plate foundation in the field of overhead transmission tower technology, comprising multiple constraint sleeves, composite column units, and multiple base plate units. The inner hole of the constraint sleeves has a conical expansion structure with an inner diameter that continuously changes along the axial direction. The composite column unit consists of four L-shaped column units, each including a support body of a quarter-circle frustum with gradually increasing radius, a base, and a base with equally spaced grooves, the base being wider than the base. The base plate unit consists of rectangular concrete columns with increasing lengths, each having symmetrical through bolt holes. Multiple constraint sleeves are press-fitted onto the composite column units, and the grooves of the base are embedded into the base plate units, connected by bolts. This invention forms a self-locking prefabricated plate foundation by press-fitting conical constraint sleeves, providing grooved mechanical interlocking, and installing pre-tightened bolts, effectively improving the shear strength and pull-out resistance of the foundation, achieving rapid and precise assembly of the foundation structure, and improving construction efficiency.

Description

Technical Field

[0001] This invention relates to a self-locking assembled plate foundation, belonging to the technical field of structural foundations for overhead power transmission towers and telecommunications towers. Background Technology

[0002] As an important component of power transmission lines, the foundation of transmission towers accounts for a large proportion of the cost, construction period, and labor consumption in the entire line project. Moreover, the construction is mostly carried out by on-site casting, which often becomes a key link restricting the progress of the project, especially under complex terrain and geological conditions.

[0003] Prefabricated slab foundations, as a type of transmission line tower foundation within the mechanized construction system for the entire transmission line process, offer several advantages. Firstly, they are economical and efficient, with reasonable costs and significantly shortened construction cycles, accelerating line commissioning and operation. Secondly, they offer controllable quality and are environmentally friendly. Factory prefabrication improves component quality stability, greatly reduces on-site wet work, minimizes disturbance to the construction environment, and aligns with green and low-carbon transformation requirements. Finally, they promote standardization and mechanization, facilitating standardized transmission line construction, reducing manual labor and procedures, and improving overall construction efficiency and technical level. Therefore, prefabricated slab foundations utilize factory-prefabricated foundation components, transported to the site for rapid and precise assembly. This effectively avoids wet work while improving the foundation's bearing capacity and pull-out resistance, thereby effectively controlling the quality of transmission line tower foundations in less developed infrastructure areas such as mountainous regions, ensuring the overall structural integrity and operational safety of the transmission line.

[0004] Currently, the factors restricting the widespread application of prefabricated foundations in transmission lines are: irregular structure of foundation components, difficulties in component processing and transportation, inconvenient connection between foundation nodes, high difficulty and low efficiency in on-site construction, and immature design methods for prefabricated foundations. There is an urgent need for a prefabricated panel foundation structure with high reliability, strong applicability, and convenient installation. Summary of the Invention

[0005] The purpose of this invention is to provide a novel self-locking assembly plate foundation, which enables rapid and precise assembly of the foundation structure, avoids on-site pouring, and improves the level of intelligent construction of transmission tower plate foundations.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0007] This invention provides a novel self-locking assembled plate foundation, comprising multiple constraint sleeves, composite column units, and multiple base plate units;

[0008] The inner hole of the constraint sleeve is a tapered expansion structure with a continuously varying inner diameter along the axial direction. The constraint sleeve is provided with spiral ribs along the circumferential direction.

[0009] The composite column is formed by four L-shaped column units.

[0010] The L-shaped column unit includes a support body, a base, and a pedestal;

[0011] The support body is a quarter-circular frustum with a gradually increasing radius. The cross-sectional radius of the support body is smaller than the cross-sectional radius of the constraint sleeve. The support body is provided with main reinforcement in the longitudinal direction.

[0012] The base is connected to the top of the base. The base is a trapezoidal cross-section base with a double-layer bidirectional steel mesh inside. The width of the base is slightly larger than that of the base. The base is provided with grooves of equal size and the grooves are spaced equally. A connecting hole is provided at the top of the groove.

[0013] The support, base, and foundation are cast as a single precast component.

[0014] The base plate unit is a rectangular concrete column with increasing length, and the base plate unit is provided with symmetrical through-holes.

[0015] The constraint sleeve is press-fitted along the axial direction of the composite column unit, and the top connection hole of the groove of the composite column unit is connected to the through connection hole of the base plate unit through a fixing component.

[0016] Optionally, the number of constraint sleeves is adjusted according to the length of the composite column unit, and the multiple constraint sleeves maintain a certain spacing.

[0017] Optionally, the double-layer bidirectional steel mesh of the base includes transverse bars, longitudinal bars, and additional bars along the inclined plane.

[0018] Optionally, the top of the main reinforcing bar of the support extends out of the top surface of the L-shaped column unit to form a reserved connection section for connection with other components;

[0019] The bottom end of the main reinforcement bar of the support body is bent and tied to the double-layer bidirectional steel mesh of the base.

[0020] Optionally, the base plate unit is connected to the base groove in a one-to-one correspondence.

[0021] Optionally, the base has four grooves, and each L-shaped column unit is connected to four base plate units.

[0022] Optionally, the length of the base plate unit increases from the inside to the outside along the base.

[0023] Optionally, the fixing component uses coarse bolts of grade 6.8 or 8.8, and the bolts are preloaded and fitted with spring washers.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0025] 1. The self-locking assembled plate foundation provided by the present invention forms a self-locking assembled plate foundation by pressing conical constraint sleeves, setting groove mechanical interlocking and installing pre-tightening bolts, which effectively improves the shear strength and pull-out resistance of the foundation.

[0026] 2. This invention specifically considers the load characteristics of transmission tower plate foundations. By manufacturing components in batches and in a standardized manner in the factory, it enables rapid and precise on-site assembly of the foundation structure, avoiding on-site pouring, facilitating transportation, allowing for flexible hoisting, and ensuring simplicity and reliability. Attached Figure Description

[0027] Figure 1 A three-dimensional schematic diagram of a self-locking assembly plate foundation;

[0028] Figure 2 Main view of the self-locking assembly plate foundation;

[0029] Figure 3 Top view of a self-locking assembly plate foundation;

[0030] Figure 4 Schematic diagram of the symmetrical axis section of a self-locking assembly plate foundation;

[0031] Figure 5 A schematic diagram of an L-shaped column unit for a self-locking assembled plate foundation.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Constraint sleeve, 2-Support body, 3-Base, 4-Base, 5-Main reinforcement, 6-Groove, 7-Base plate unit, 8-Bolt hole, 9-Spiral stirrup, 10-Double-layer bidirectional steel mesh, 11-L-shaped column unit, 12-Composite column unit. Detailed Implementation

[0034] The present invention will be further described below with reference to specific embodiments.

[0035] Example 1:

[0036] This embodiment provides a self-locking assembled plate foundation, including multiple constraint sleeves 1, composite column units 12 and multiple base plate units 7;

[0037] The composite column unit 12 is formed by four L-shaped column units 11, such as... Figure 1 , Figure 2 and Figure 5As shown, the L-shaped column unit 11 includes a support body 2, a base 3 and a base 4. The support body 2 is a quarter-circular frustum with a gradually increasing radius and main ribs 5 are arranged along the longitudinal direction. The base 3 is connected to the base 4 with grooves 6. The width of the base 4 is greater than that of the base 3 and bolt holes 8 are provided at the top of both ends of the grooves 6. Each L-shaped column unit 11 is provided with four equally spaced grooves 6.

[0038] like Figure 1 and Figure 3 As shown, four L-shaped column units 11 enclose a composite column unit 12. A sleeve constraint is provided in the support body 2 part, which is pressed along the axial direction. The inner hole is a conical expansion structure, and the inner diameter of the constraint sleeve 1 changes continuously along the axial direction. The base plate unit 7 is a concrete body with increasing length. Symmetrical through bolt holes 8 are provided along the axial direction, corresponding to the bolt holes 8 at the top of the groove 6. The length of the base plate unit 7 increases along the length direction of the base 4. The distance between adjacent base plate units 7 is equal to the distance between the grooves 6.

[0039] like Figure 4 As shown, the constraint sleeve 1 is equipped with spiral stirrups 9, which are arranged circumferentially along the inner side of the sleeve and are formed by welding. A double-layer bidirectional steel mesh 10 is set on the base 3. After the double-layer bidirectional steel mesh 10 is tied, the longitudinal steel bars and main bars 5 in the double-layer bidirectional steel mesh 10 are welded and fixed, and then concrete is poured. The support body 2, base 3 and base 4 are integrally cast into a composite column unit by concrete, which is convenient for transportation and foundation assembly. Multiple removable gaskets are evenly spaced on the top of the groove 6 to avoid stress concentration of the connecting bolts and local crushing of the concrete.

[0040] The steel material for the main reinforcement 5, spiral stirrups 9, and double-layer bidirectional steel mesh 10 can be any one of Q355, Q390, Q420, and Q460; the bolts should be grade 6.8 or grade 8.8 coarse bolts.

[0041] Example 2:

[0042] This embodiment provides a self-locking assembly plate foundation, the specific manufacturing steps of which are as follows:

[0043] The factory has completed the prefabricated components of the new self-locking assembled slab foundation, including constraint sleeve 1, support body 2, base 3, base 4, main reinforcement 5, groove 6, bottom plate unit 7, bolt hole 8, spiral stirrup 9, and double-layer bidirectional steel mesh 10.

[0044] The factory completes the arrangement of spiral stirrups 9 with different inner diameters on the inner side of the constraint sleeve 1 and prefabricates them.

[0045] The factory completed the casting of L-shaped column unit 11. The base 3 is equipped with a double-layer bidirectional steel mesh 10. After the double-layer bidirectional steel mesh 10 is tied, the longitudinal steel bars (steel bars along the length of the base) and the main bars 5 in the double-layer bidirectional steel mesh 10 are welded and fixed. The support body 2, the base 3 and the base 4 are cast as a single complete column unit by concrete.

[0046] The factory completed the arrangement of groove 6 and the arrangement of bolt holes 8 on the top surface of the groove.

[0047] The factory completed the prefabrication of base plate unit 7 and the arrangement of through bolt holes 8 at both ends of the base plate unit.

[0048] The factory completed the trial assembly of constraint sleeve 1, base plate unit 7 and 4 L-shaped column units 11.

[0049] The new self-locking prefabricated slab foundation utilizes press-fitted conical constraint sleeves, grooved mechanical interlocking, and pre-tightened bolts to form a self-locking prefabricated slab foundation, effectively improving the shear strength and pull-out resistance of slab foundations. This prefabricated slab foundation uses factory-prefabricated foundation components, which are then transported to the site for rapid and precise assembly, enhancing the stability of component quality.

[0050] After the prefabricated components of the new self-locking prefabricated panel foundation are transported to the construction site, they are assembled in sections.

[0051] On-site, the prepared concrete is poured onto the double-layer bidirectional steel mesh 10 and the main reinforcement 5, and cured for 28 days as required. Then, the construction quality of the column unit is inspected. After the inspection is passed, four column units are spliced ​​on-site, the constraint sleeves 1 are pressed in, and the base plate units 7 are fixed with bolts and grooves 6 to obtain the new type of self-locking assembled plate foundation. This assembled plate foundation can greatly avoid the amount of wet work on-site, reduce the disturbance to the construction environment, promote standardization and mechanization, facilitate the standardized construction of transmission lines, reduce the amount of manual work and procedures, improve the overall construction efficiency and technical level, control the quality of transmission line tower foundations in mountainous and other areas with poor infrastructure, and ensure the overall structural integrity and operational safety of the transmission line.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A self-locking assembled plate foundation, characterized in that, It includes multiple constraint sleeves, composite column units, and multiple base plate units; The inner hole of the constraint sleeve is a tapered expansion structure with a continuously varying inner diameter along the axial direction. The constraint sleeve is provided with spiral ribs along the circumferential direction. The composite column is formed by four L-shaped column units. The L-shaped column unit includes a support body, a base, and a pedestal; The support body is a quarter-circular frustum with a gradually increasing radius. The cross-sectional radius of the support body is smaller than the cross-sectional radius of the constraint sleeve. The support body is provided with main reinforcement in the longitudinal direction. The base is connected to the top of the base. The base is a trapezoidal cross-section base with a double-layer bidirectional steel mesh inside. The width of the base is greater than that of the base. The base is provided with grooves of equal size and the grooves are spaced equally. The top of the grooves is provided with connecting holes. The support, base and foundation are cast as a single precast L-shaped column unit. The base plate unit is a rectangular concrete column with increasing length, and the base plate unit is provided with symmetrical through-holes. The constraint sleeve is press-fitted along the axial direction of the composite column unit, and the top connection hole of the groove of the composite column unit is connected to the through connection hole of the base plate unit through a fixing component.

2. The self-locking assembled plate foundation according to claim 1, characterized in that, The number of constraint sleeves is adjusted according to the length of the composite column unit, and the multiple constraint sleeves maintain a certain spacing.

3. The self-locking assembled plate foundation according to claim 1, characterized in that, The base has a double-layer bidirectional steel mesh, which includes transverse bars, longitudinal bars, and additional bars along the inclined plane.

4. The self-locking assembly plate foundation according to claim 1 or 3, characterized in that, The top of the main reinforcement of the support extends out of the top surface of the L-shaped column unit, forming a reserved connection section for connecting with other components; The bottom end of the main reinforcement bar of the support body is bent and tied to the double-layer bidirectional steel mesh of the base.

5. The self-locking assembled plate foundation according to claim 1, characterized in that, The base plate unit is connected to the base groove in a one-to-one correspondence.

6. The self-locking assembled plate foundation according to claim 1, characterized in that, The base has four grooves, and each L-shaped column unit is connected to four base plate units.

7. The self-locking assembly plate foundation according to claim 1, 5, or 6, characterized in that, The length of the base plate unit increases from the inside to the outside along the base.

8. The self-locking assembled plate foundation according to claim 1, characterized in that, The fixing component uses coarse bolts of grade 6.8 or 8.8, and the bolts are preloaded and fitted with spring washers.

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