Inclined single-anchor spiral anchor foundation without on-site welding and its construction method

Abstract

The inclined single-anchor spiral anchor foundation that does not require on-site welding and its construction method include an anchor rod and an anchor plate located on the anchor rod. A connecting section is provided at the top of the anchor rod, which is connected to the main material of the tower leg through the connecting section. The anchor rod is arranged obliquely. The connecting section includes a sleeve, a connecting plate, the main material of the tower leg and a bolt. The anchor rod is fixedly connected to the sleeve by bolts, and a connecting plate is provided at the top of the sleeve, which is connected to the main material of the tower leg. The positional relationship between the connecting plate and the sleeve is determined by on-site layout, and then the entire connecting section structure is processed and galvanized for corrosion protection in the factory. The inclined single-anchor spiral anchor foundation that does not require on-site welding has a reasonable structure, which can effectively reduce horizontal displacement and improve horizontal bearing capacity performance; it simplifies the connection type between the foundation and the tower, eliminates anchor bolts, and reduces material consumption; it avoids on-site welding and on-site corrosion protection, reduces construction difficulty, and ensures construction quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of power transmission engineering, and specifically relates to an inclined single-anchor spiral anchor foundation that does not require on-site welding and a construction method thereof. The foundation is suitable for sites with good traffic conditions and convenient access and operation of mechanical equipment, and can be used for other soil types except rock and gravel. Background Art

[0002] A spiral anchor foundation is an anchoring structure composed of spiral anchors and an upper pedestal. It primarily utilizes deep soil layers to resist the forces of the superstructure. Primarily composed of steel components, this foundation is factory-prefabricated, ensuring consistent quality. Mechanized construction reduces the number of steps and simplifies construction, significantly reducing or eliminating the use of concrete and significantly shortening the construction period. Furthermore, spiral anchor construction eliminates the need for extensive excavation, resulting in relatively minimal surface damage and significant environmental benefits. Furthermore, spiral anchors minimally disturb the soil, fully leveraging the inherent strength of the original soil and saving on foundation materials.

[0003] At present, there are still some problems with spiral anchor foundations. The first is the problem of the horizontal bearing capacity performance of the single-anchor spiral anchor foundation. In order to facilitate the construction of spiral anchors, most domestic companies currently adopt the solution of vertical arrangement of anchor rods. Since the anchor rods are relatively thin, they are prone to large deformation under the action of horizontal loads and cannot meet the horizontal bearing capacity requirements. The second is the problem of on-site welding of spiral anchor foundations and tower legs. The current common practice is to weld the connectors on site at the top of the anchor rods after the construction is completed to achieve the connection with the tower legs. On-site welding has high requirements for the welding process and is difficult to meet the quality acceptance requirements. In addition, on-site anti-corrosion is required after the welding is completed, and the quality is difficult to guarantee. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: how to solve the problems of existing spiral anchor foundations requiring on-site welding and insufficient horizontal bearing capacity performance, so as to provide an inclined single-anchor spiral anchor foundation that does not require on-site welding, and provide a construction method for the foundation.

[0005] The technical solution of the present invention is specifically as follows:

[0006] An inclined single-anchor spiral anchor foundation that does not require on-site welding includes an anchor rod and an anchor plate located on the anchor rod. A connecting section is provided at the top of the anchor rod, which is connected to the main material of the tower leg through the connecting section; the anchor rod is arranged inclined; the connecting section includes a sleeve, a connecting plate, the main material of the tower leg and a bolt; wherein the anchor rod is fixedly connected to the sleeve by bolts, a connecting plate is provided at the top of the sleeve, and the connecting plate is connected to the main material of the tower leg.

[0007] The inclination angle of the anchor rod is the same as or slightly larger than that of the main material of the tower leg.

[0008] The anchor disc is spiral-shaped, and a plurality of anchor discs are welded to the outer periphery of the anchor rod at intervals along the axial direction of the anchor rod.

[0009] The diameter of the sleeve is slightly larger than the diameter of the anchor rod; a bolt hole is provided at the upper end of the anchor rod, and a bolt hole corresponding to the top of the anchor rod is provided on the wall of the sleeve, and the two are connected by bolts.

[0010] The main material of the tower leg and the connecting plate, as well as the sleeve and the connecting plate are connected by welding.

[0011] The tower leg main material and the connecting plate, as well as the sleeve and the connecting plate are connected by butt fillet welds.

[0012] Stiffening plates are set at the tips of the connecting plates; the stiffening plates at the tips are set along the two legs of the tower angle steel, and the stiffening plates at the back of the legs are arranged in a "Y" shape with the angle steel and are welded to the tower angle steel as a whole.

[0013] The anchor rod, tower leg main material and the connecting plate are coaxially arranged.

[0014] A construction method for an inclined single-anchor type spiral anchor foundation without on-site welding comprises the following steps:

[0015] S1: Determine the screwing position and spatial angle of the anchor rod by on-site measurement and layout;

[0016] S2: Screw the anchor rod to the designed burial depth, ensure that the horizontal deviation of the center point of the anchor rod is no more than the design allowable value, and ensure that the highest point of the anchor rod 1 is slightly lower than the bottom elevation of the connecting plate, and the clear distance should be no less than the weld height;

[0017] S3: Use graph paper to simulate a sleeve, wrap it tightly around the anchor rod, and secure it to determine the bolt hole location. Cut the graph paper at the elevation of the connecting plate bottom surface, place the connecting plate on it, and determine the spatial position of the connecting plate based on the foundation root opening information. Mark the connecting plate model on the graph paper, then determine the connection position between the top surface of the sleeve and the bottom surface of the connecting plate. Make an elliptical mark on the graph paper for the sleeve.

[0018] S4: The graph paper is returned to the factory for processing the sleeve, the oval mark on the graph paper on the bottom surface of the connecting plate model is copied to the bottom surface of the connecting plate, and the sleeve and the connecting plate are welded according to the oval mark on the connecting plate. The tower leg main material and the stiffening plate are then welded into a whole and galvanized.

[0019] S5: transporting the connecting section to the site for installation, thereby completing the construction of the inclined single-anchor spiral anchor foundation that does not require on-site welding.

[0020] The beneficial effects of the present invention are:

[0021] (1) The anchor rods of the spiral anchor foundation provided by the present invention are arranged obliquely, which can greatly improve the horizontal bearing capacity of the spiral anchor foundation. Compared with the vertical single spiral anchor foundation, the cross-sectional area of ​​the anchor rod can be reduced, and the vertical single anchor can avoid the need to add a local reinforcement section (a larger diameter steel pipe, concrete column or reinforced concrete column) on the outside of the anchor rod below the ground due to insufficient horizontal bearing capacity, thereby saving material costs and construction costs;

[0022] (2) The connecting section structure design of the spiral anchor foundation provided by the present invention is simple and reasonable. The use of welding connection can improve the node stiffness, and the anchor bolts are eliminated, thus saving material consumption.

[0023] (3) The spiral anchor foundation provided by the present invention can avoid on-site welding and on-site anti-corrosion, reduce construction difficulty, and ensure construction quality.

[0024] The present invention provides a construction method for an inclined single-anchor type spiral anchor foundation that does not require on-site welding. Using the above-mentioned inclined single-anchor type spiral anchor foundation that does not require on-site welding, after the anchor rod is screwed to the designed burial depth, the positional relationship between the components of the connection section can be determined through on-site layout, and then the entire connection section structure can be returned to the factory for processing and galvanizing for anti-corrosion treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the inclined single-anchor type spiral anchor foundation provided by the present invention without on-site welding;

[0026] Figure 2 It is a top view of the connecting plate. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0029] like Figure 1As shown, an inclined single-anchor spiral anchor foundation that does not require on-site welding includes: an anchor rod 1, and an anchor plate 2 located on the anchor rod 1. A connecting section is provided on the top of the anchor rod 1, and the tower leg main material 5 is connected through the connecting section.

[0030] The anchor rod 1 is arranged in an inclined manner, and the inclination angle is preferably the same as or slightly larger than that of the tower leg main material 5.

[0031] The anchor discs 2 are spiral-shaped, and the number thereof is determined according to the bearing capacity calculation, and can be multiple, and are welded to the outer periphery of the anchor rod 1 at intervals along the axial direction of the anchor rod 1 .

[0032] Furthermore, the connection section is mainly composed of a sleeve 3, a connecting plate 4, a tower leg main material 5, a stiffening plate 6 and a bolt 7. Among them, the anchor rod 1 is fixedly connected to the sleeve 3 by the bolt 7, and a connecting plate 4 is set on the top of the sleeve 3, and the connecting plate 4 is connected to the tower leg main material 5.

[0033] Furthermore, the anchor rod 1 is connected to the sleeve 3, whose diameter is slightly larger than that of the anchor rod 1. A bolt hole is provided at the upper end of the anchor rod 1, and the wall of the sleeve 3 is provided with bolt holes corresponding to the top of the anchor rod 1. The two are connected by bolts 7. The position of the bolt holes can be arranged arbitrarily as long as the structural requirements are met. The length of the sleeve 3 and the specifications and number of the bolts 7 are determined based on force calculations.

[0034] like Figure 2 As shown, the tower leg main material 5 and the connecting plate 4, as well as the sleeve 3 and the connecting plate 4 are connected by welding, preferably by butt fillet welds.

[0035] The limb tips of the connecting plate 4 are provided with stiffening plates 6 for reinforcement. The stiffening plates 6 at the limb tips should be provided along the two limbs of the angle steel, and the stiffening plates 6 at the limb backs should be arranged in a "Y" shape with the angle steel and welded to a whole with the angle steel.

[0036] More preferably, the anchor rod 1 , the tower leg main material 5 and the connecting plate 4 should be coaxially or substantially coaxially arranged.

[0037] During the anchor bolt tightening process, the tightening angle of the anchor bolt should be monitored in a timely manner using measuring instruments to ensure the accuracy of the anchor bolt construction. When the designed burial depth is about to be reached, the tightening speed should be slowed down to ensure that the highest point of the anchor bolt reaches the designed height.

[0038] As an improvement to the technical solution, the positional relationship between the connecting plate 4 and the sleeve 3 needs to be determined through on-site layout. Graph paper can be used to simulate the sleeve, tightly wrapping it around the sleeve 3 and securing it. A laser line projector, theodolite, or other similar device is used to mark the bottom elevation of the connecting plate 4. At this elevation, the graph paper is cut to form an elliptical line. The connecting plate 4 is then placed on top of the sleeve. The specific position of the connecting plate 4 is determined by layout based on the foundation root opening information. An elliptical line is then drawn on the graph paper on the bottom surface of the connecting plate 4, along the top surface of the graph paper, to determine the connection position between the two. The entire connecting section is then returned to the factory for processing and corrosion treatment.

[0039] The present invention also provides a construction method of an inclined single-anchor type spiral anchor foundation that does not require on-site welding. The construction method of an inclined single-anchor type spiral anchor foundation that does not require on-site welding comprises the following steps:

[0040] S1: Determine the screwing position and spatial angle of the anchor rod 1 through on-site measurement and layout;

[0041] S2: Screw the anchor rod 1 to the designed burial depth, ensure that the horizontal deviation of the center point of the anchor rod is no more than the design allowable value, and ensure that the elevation of the highest point of the anchor rod 1 is slightly lower than the bottom elevation of the connecting plate 4, and the clear distance should be no less than the height of the butt fillet weld;

[0042] S3: Use graph paper to simulate the sleeve 3, wrapping it tightly around the anchor rod 1 and securing it to determine the bolt hole locations. Cut the graph paper at the elevation of the bottom surface of the connecting plate 4, place the connecting plate 4 on top of it, and determine the spatial position of the connecting plate 4 based on the foundation root opening information. Mark the connecting plate model on the graph paper, then determine the connection position between the top surface of the sleeve 3 and the bottom surface of the connecting plate 4. Make an elliptical mark on the graph paper for the sleeve;

[0043] S4: The graph paper is returned to the factory for processing the sleeve 3, the oval mark on the graph paper on the bottom surface of the connecting plate model is copied to the bottom surface of the connecting plate 4, and the sleeve 3 and the connecting plate 4 are welded according to the oval mark on the connecting plate 4. The tower leg main material 5 and the stiffening plate 6 are then welded into a whole and galvanized.

[0044] S5: transporting the connecting section to the site for installation, thereby completing the construction of the inclined single-anchor spiral anchor foundation that does not require on-site welding.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the scope of protection of the present invention.

Claims

1. A construction method for an inclined single-anchor type spiral anchor foundation without on-site welding, comprising an anchor rod (1) and an anchor plate (2) located on the anchor rod (1), characterized in that: A connecting section is provided at the top of the anchor rod (1), and is connected to the tower leg main material (5) through the connecting section; the anchor rod (1) is arranged obliquely; the connecting section comprises a sleeve (3), a connecting plate (4), the tower leg main material (5) and a bolt (7); wherein the anchor rod (1) is fixedly connected to the sleeve (3) through the bolt (7); a connecting plate (4) is provided at the top of the sleeve (3), and the connecting plate (4) is connected to the tower leg main material (5); A stiffening plate (6) is provided at the tip of the connecting plate (4); the stiffening plate (6) at the tip of the limb is provided along two limbs of the iron tower angle steel, and the stiffening plate (6) at the back of the limb is arranged in a "Y" shape with the angle steel and is welded to the iron tower angle steel as a whole; Construction methods include: S1: determining the screwing position and spatial angle of the anchor rod (1) through on-site measurement and layout; S2: Screw the anchor rod (1) to the designed buried depth, ensure that the horizontal deviation of the center point of the anchor rod is not greater than the design allowable value, and ensure that the highest point elevation of the anchor rod (1) is slightly lower than the bottom elevation of the connecting plate (4), and the net distance should be no less than the weld height; S3: Using graph paper to simulate a sleeve (3), tightly wrap it around the anchor rod (1) and fix it to determine the position of the bolt hole; cutting the graph paper at the elevation of the bottom surface of the connecting plate (4), placing the connecting plate (4) on it, and determining the spatial position of the connecting plate (4) by lofting according to the foundation root opening information, marking the connecting plate model on the graph paper, and then determining the connection position between the top surface of the sleeve (3) and the bottom surface of the connecting plate (4), and making an elliptical mark of the sleeve on the graph paper; S4: The graph paper is returned to the factory for processing the sleeve (3), the oval mark on the graph paper on the bottom surface of the connecting plate model is copied to the bottom surface of the connecting plate (4), and the sleeve (3) and the connecting plate (4) are welded according to the oval mark on the connecting plate (4), and then the tower leg main material (5) and the stiffening plate (6) are welded into a whole and galvanized; S5: transporting the connecting section to the site for installation, thereby completing the construction of the inclined single-anchor type spiral anchor foundation that does not require on-site welding.

2. The construction method of the inclined single-anchor type spiral anchor foundation without on-site welding according to claim 1 is characterized in that: The inclination angle of the anchor rod (1) is the same as or slightly larger than that of the tower leg main material (5).

3. The construction method of the inclined single-anchor type spiral anchor foundation without on-site welding according to claim 1 is characterized in that: The anchor disc (2) is spiral-shaped, and a plurality of anchor discs are welded to the outer periphery of the anchor rod (1) at intervals along the axial direction of the anchor rod (1).

4. The construction method of the inclined single-anchor type spiral anchor foundation without on-site welding according to claim 1 is characterized in that: The diameter of the sleeve (3) is slightly larger than the diameter of the anchor rod (1); a bolt hole is provided at the upper end of the anchor rod (1); the wall of the sleeve (3) is provided with a bolt hole corresponding to the top of the anchor rod (1); and the two are connected by a bolt (7).

5. The construction method of the inclined single-anchor type spiral anchor foundation without on-site welding according to claim 1 is characterized in that: The tower leg main material (5) and the connecting plate (4), as well as the sleeve (3) and the connecting plate (4), are connected by welding.

6. The construction method of the inclined single-anchor type spiral anchor foundation without on-site welding according to claim 5 is characterized in that: The tower leg main material (5) and the connecting plate (4), as well as the sleeve (3) and the connecting plate (4), are connected by butt fillet welds.

7. The construction method of the inclined single-anchor type spiral anchor foundation without on-site welding according to claim 1 is characterized in that: The anchor rod (1), the tower leg main material (5) and the connecting plate (4) are coaxially arranged.

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