A fabricated spiral anchor foundation and a manufacturing method thereof

Abstract

The application provides a fabricated spiral anchor foundation and a manufacturing method thereof. The fabricated spiral anchor foundation comprises inclined single anchor rods buried in the four corners of a tower core. The upper end of the inclined single anchor rod is provided with a connecting base. The connecting base comprises a bottom plate. The diagonal lines of the bottom plate are tower core lines and face the tower core. The upper end of the bottom plate is welded with an inclined upward angle steel. The lower end is fixedly welded with a sleeve. The sleeve is sleeved on the upper end of the inclined single anchor rod and is connected with the inclined single anchor rod through bolts. The application is suitable for 220V angle steel towers. The tower feet of the tower body correspond to the inclined single anchor rods one by one. The tower feet are connected with the angle steel bolts on the connecting base through bolts. There is no maintenance period. The tower can be assembled after the foundation construction is completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spiral anchor foundation, in particular to a fabricated spiral anchor foundation and a manufacturing method thereof. BACKGROUND

[0002] The spiral anchor is mainly welded with several spiral anchors on a steel pipe, which is rotated into the ground like a screw during construction, and has good anti-pulling, anti-compression and anti-overturning bearing capacity. Compared with the conventional tower foundation, the spiral anchor has the advantages of simple structure, convenient construction, high mechanization degree and less influence on water and soil resources. Through mechanized construction, the labor and construction period can be significantly reduced.

[0003] CN212561599U discloses a power transmission line tower straight column eccentric inclined inclined anchor type spiral anchor foundation, which mainly comprises a concrete cap, and a plurality of inclined spiral anchors are arranged below the concrete cap. On the one hand, the structure needs to pour a concrete cap, which has a maintenance period. On the other hand, one leg of the tower needs to be rotated into multiple spiral anchors. If used for a 220V power transmission angle steel tower, the construction cost is increased and the construction period is prolonged.

[0004] In addition, the spiral anchor is welded and processed on site, which is prone to large spiral anchor processing errors, poor welding quality, and failure to meet the quality requirements of the angle steel tower assembly, thereby increasing the construction difficulty and cost. SUMMARY

[0005] The present application provides a fabricated spiral anchor foundation and a manufacturing method thereof, which is suitable for a 220V angle steel tower. The tower leg of the tower body corresponds to the inclined single anchor rod one by one, the tower leg is connected to the angle steel bolt on the connecting base, there is no maintenance period, and the tower can be assembled after the foundation construction is completed.

[0006] The technical scheme of the present application is as follows: a fabricated spiral anchor foundation, comprising inclined single anchor rods buried in the four corners of the tower core, the upper end of the inclined single anchor rod is provided with a connecting base, the connecting base comprises a bottom plate, one pair of diagonal lines of the bottom plate is a tower core line and faces the tower core, the upper end of the bottom plate is welded with an inclined upward angle steel, and the lower end is welded and fixed with a sleeve, the sleeve is sleeved on the upper end of the inclined single anchor rod and connected with the inclined single anchor rod by bolts, and the inclination angle of the angle steel changes with the inclination angle of the connected tower type.

[0007] Further, the first stiffener plate is welded and fixed at the sharp end of the outer side of the angle steel, and the second stiffener plate is welded and fixed on both sides of the angle steel. The lower end of the first stiffener plate and the second stiffener plate is welded and connected with the bottom plate.

[0008] Further, the first stiffener plate and the angle bisector of the angle steel are on the same straight line, and the straight line is one pair of diagonal lines of the bottom plate.

[0009] Further, the second stiffener plate is in the same plane as the side wall of the angle steel, and the second stiffener plate extends from the side wall of the angle steel to the edge of the base plate.

[0010] Further, the intersection of the first stiffener plate, the angle steel and the base plate is provided with a first galvanized hole; and the intersection of the second stiffener plate, the angle steel and the base plate is provided with a second galvanized hole.

[0011] A preparation method of a fabricated spiral anchor foundation, comprising the following steps:

[0012] (1) At the construction site, four inclined single anchor rods are screwed into the four corners of the tower core, and a tubular formwork is sleeved on the inclined single anchor rod; then an elliptical intersection line is projected on the tubular formwork by using a projection instrument, and the elliptical intersection line is drawn and cut to obtain a cutting end surface of the sleeve pipe welding end, and the preparation of the sleeve pipe formwork is completed;

[0013] (2) At the construction site, a horizontal formwork is detachably fixed to the lower side of a transparent plate, and the transparent plate is used to simulate the base plate; a tower core line is drawn on the transparent plate by using a projection instrument, and the tower core line is a diagonal line of the transparent plate; the relative positions of the base root opening of the transparent plate, the transparent plate and the bolt hole of the anchor rod, and the cutting end surface height of the tubular formwork are measured, and then the position of the base plate is determined by the transparent plate;

[0014] Then, a sleeve positioning line, a corresponding point of the anchor rod bolt hole and the tower core line are drawn on the horizontal formwork along the top of the sleeve pipe formwork;

[0015] (3) In the factory, the sleeve pipe formwork is sleeved on the vertical circular pipe to be processed, the cutting end surface faces upward, the vertical circular pipe is cut after the cutting end surface is marked, and the sleeve pipe is obtained;

[0016] (4) In the factory, an angle steel is welded and fixed on one end surface of the base plate, the horizontal formwork is overlapped with the other end surface of the base plate, the tower core line is a diagonal line of the base plate, and the cutting end surface of the sleeve pipe is overlapped with the sleeve positioning line for welding and fixing, and a connecting base is obtained;

[0017] (5) The connecting base is sent to the construction site and connected with the corresponding inclined single anchor rod bolt.

[0018] Further, in step (1), the projection method of the elliptical intersection line is as follows: a horizontal line is projected on the tubular formwork by using a projection instrument, and the projection position of the horizontal line is determined according to the design elevation of the base plate, and the horizontal line forms an elliptical intersection line on the tubular formwork.

[0019] Further, in step (1), the tubular formwork is provided with a positioning hole corresponding to the position of the anchor rod bolt hole, and a first positioning rod is used to pass through the positioning hole and the anchor rod bolt hole to position the tubular formwork on the inclined single anchor rod.

[0020] Further, in step (3), a sleeve bolt hole is formed at a position corresponding to the positioning hole on the vertical circular pipe, and the sleeve template is positioned on the vertical pipe by using the second positioning rod to pass through the positioning hole and the sleeve bolt hole.

[0021] Advantages of the present application:

[0022] The assembled spiral anchor foundation of the present application is suitable for 220V angle steel towers, adopts inclined single anchor rods, one tower foot of the tower body corresponds to one inclined single anchor rod, the inclined single anchor rod is connected with the sleeve bolt of the connecting base, the tower foot is connected with the angle steel bolt on the connecting base, there is no maintenance period, and the tower can be assembled after the foundation construction is completed; moreover, the present application increases the connection strength of the angle steel and the bottom plate through the arrangement of the first stiffener plate and the second stiffener plate, the spiral anchor foundation has stable quality and strong bearing capacity. The relative positions of the sleeve, the bottom plate and the like are determined on site, and then the spiral anchor is processed and welded in the factory and assembled on site, so that the welding and processing quality of the spiral anchor is ensured, and the construction difficulty and cost are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0024] Figure 1 is a top view of the present application;

[0025] Figure 2 is a structural schematic view of the inclined single anchor rod;

[0026] Figure 3 is a structural schematic view of the connecting base;

[0027] Figure 4 is a sectional view of Figure 1-1 ;

[0028] Figure 5 is a structural schematic view of the sleeve;

[0029] Figure 6 is a structural schematic view of the tubular template;

[0030] Figure 7 is a left view of Figure 6 ;

[0031] Figure 8 is a structural schematic view of the horizontal template placed on the cut end face;

[0032] Figure 9 is a structural schematic view of the sleeve positioning line;

[0033] Figure 10 This is a schematic diagram of a vertical circular tube.

[0034] Figure 11 This is a schematic diagram of the sleeve structure;

[0035] Figure 12 This is a schematic diagram of a structure where the base plate and the horizontal template overlap.

[0036] 1. Base plate, 2. Sleeve, 3. Angle steel, 4. Connecting hole, 6. First stiffening plate, 7. First galvanized hole, 8. Second stiffening plate, 9. Second galvanized hole, 10. Inclined single anchor rod, 11. Tower center line, 12. Positioning hole, 13. Corresponding point, 14. Tubular template, 15. First positioning rod, 16. Elliptical intersection line, 17. Transparent plate, 18. Horizontal line, 19. Vertical round tube, 20. Second positioning rod, 21. Horizontal template, 22. Sleeve positioning line, 23. Sleeve template. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] like Figure 1-5 As shown, a prefabricated spiral anchor foundation includes inclined single anchor rods 10 embedded at the four corners of the tower core. A connecting base is provided at the upper end of each inclined single anchor rod 10. The connecting base includes a base plate 1, with one diagonal of the base plate 1 aligning with the tower core line 11 and facing the tower core. An upwardly inclined angle steel 3 is welded to the upper end of the base plate 1. Multiple connecting holes 4 are vertically arranged on both sides of the angle steel 3, which are bolted to the tower feet (main material angle steel) of the tower body. The base plate 1 is higher than the ground level at the center pile of the tower, such as +0.3m above the ground.

[0040] A first stiffening plate 6 is welded and fixed to the outer tip of the angle steel 3. The angle bisector of the first stiffening plate 6 and the angle steel 3 are on the same straight line, which is a diagonal of the base plate 1. The lower ends of the first stiffening plate 6 are welded to the base plate 1. A first galvanized hole 7 is provided at the intersection of the first stiffening plate 6, the angle steel 3 and the base plate 1.

[0041] A second stiffening plate 8 is welded and fixed to both sides of the angle steel 3. The second stiffening plate 8 is in the same plane as the side wall of the angle steel 3 and extends from the side wall of the angle steel 3 to the edge of the base plate 1. The lower end of the second stiffening plate 8 is welded to the base plate 1. A second galvanized hole 9 is provided at the intersection of the second stiffening plate 8, the angle steel 3 and the base plate 1.

[0042] The vertical height of the first stiffening plate 6 is lower than that of the angle steel 3, and the vertical height of the second stiffening plate 8 is lower than that of the first stiffening plate 6. The upper ends of the first stiffening plate 6 and the second stiffening plate 8 are both kept horizontal with the base plate 1. The setting of the first galvanized hole 7 and the second galvanized hole 9 makes the subsequent galvanizing process of the connecting base proceed smoothly.

[0043] The lower end of the base plate 1 is welded and fixed with the sleeve pipe 2, the center of the upper end surface of the base plate 1 is located inside the angle steel 3, the center of the upper end surface of the base plate 1 is the intersection of the diagonal lines of the base plate 1, and the base plate 1 is a square plate. A plurality of bolt holes are vertically arranged on the sleeve pipe 2, the sleeve pipe 2 is sleeved on the upper end of the inclined single anchor rod 10, and is connected with the inclined single anchor rod 10 through the bolt holes. The inclination angle of the angle steel 3 changes with the inclination angle of the connected tower.

[0044] Example 2

[0045] A preparation method of the fabricated spiral anchor foundation described in Example 1, comprising the following steps:

[0046] (1) As shown in Figure 1 , 6 and 7, four inclined single anchor rods 10 are respectively screwed into the four corners of the tower center on the construction site, and a tubular formwork 14 is sleeved on the inclined single anchor rod 10. The tubular formwork 14 is provided with a positioning hole 12, the positioning hole 12 is consistent with the position of the bolt hole on the inclined single anchor rod 10, a detachable first positioning rod 15 is inserted into the position corresponding to the positioning hole 12 on the inclined single anchor rod 10, and the first positioning rod 15 passes through the positioning hole 12 to fix the tubular formwork 14 on the inclined single anchor rod 10.

[0047] Then, an elliptical intersecting line 16 is projected on the tubular formwork 14 by using a projection instrument. The projection method of the elliptical intersecting line 16 is as follows: a horizontal line 18 is projected on the tubular formwork 14 by using a projection instrument, the projection position of the horizontal line 18 is determined according to the design elevation of the base plate 5 (such as the ground surface at the relative tower center pile +(0.3-0.02) m), the horizontal line 18 forms the elliptical intersecting line 16 on the tubular formwork 14, and the elliptical intersecting line 16 extends from one side of the tubular formwork 14 to the other side. The elliptical intersecting line 16 is drawn along and then cut to obtain a cutting end surface of the welded end of the sleeve pipe 2, and the preparation of the sleeve pipe formwork 23 is completed.

[0048] (2) As shown in Figure 8 and 9As shown, at the construction site, the horizontal template 21 is detachably fixed to the lower side of a transparent plate 17 (such as using clips to hold the transparent plate 17 and the edge of the horizontal template 21). The transparent plate 17 is used to simulate the base plate 1. The transparent plate 17 has the same length and width as the bottom edge 1. The fixed horizontal template 21 is placed on top of the sleeve template 23 prepared in step (1).

[0049] Using a projection device, draw the tower center line 11 on the transparent plate 17. The tower center line 11 points to the center of the tower and is a diagonal line of the horizontal template 21. Measure the foundation root opening of the transparent plate 17, the relative position of the transparent plate 17 and the anchor bolt holes, and the height of the cut end face of the tubular template 14. Then, determine the position of the base plate 5 using the transparent plate 17.

[0050] Then, draw the sleeve positioning line 22, the corresponding point 13 of the anchor bolt hole, and the tower center line 11 on the top (cut end face) of the sleeve template 23 on the horizontal template 21;

[0051] (3) Figure 10-11 As shown, in the factory, the sleeve template 23 is fitted onto the vertical circular tube 19 to be processed. Sleeve bolt holes are opened on the vertical circular tube 19, and the positioning hole 12 corresponds to the sleeve bolt hole. The second positioning rod 20 passes through the positioning hole 12 and the sleeve bolt hole to position the sleeve template 23 on the vertical circular tube 19. The cutting end face of the sleeve template 23 faces upward. After marking the cutting end face, the vertical circular tube 19 is cut to obtain the sleeve 2.

[0052] (4) In the factory, weld and fix angle steel 3 to one end face of the base plate 1, such as... Figure 12 As shown, the horizontal template 21 is aligned with the other end face of the base plate 1, and the tower center line 11 is aligned with a diagonal line of the base plate 1; then the bolt holes of the sleeve 2 are aligned with the corresponding points 13 of the anchor bolt holes, and the cut end face of the sleeve 2 is aligned with the sleeve positioning line 22 for welding and fixing to obtain the connecting base.

[0053] (5) Send the connecting base to the construction site and connect it with the corresponding inclined single anchor bolt 10 bolt.

[0054] The tubular template 14 and the horizontal template 21 of the present invention are both made of millimeter-square graph paper (film).

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a prefabricated spiral anchor foundation, the prefabricated spiral anchor foundation including inclined single anchor rods embedded at the four corners of the tower core, the upper end of the inclined single anchor rod is provided with a connecting base, the connecting base includes a base plate, one diagonal of the base plate is the tower core line and faces the tower core, the upper end of the base plate is welded with an inclined upward angle steel, the lower end is welded with a sleeve, the sleeve is fitted onto the upper end of the inclined single anchor rod and is bolted to the inclined single anchor rod; Its features are, The preparation method includes the following steps: (1) At the construction site, four inclined single anchor rods are screwed into the four corners of the tower core respectively, and a tubular template is installed on the inclined single anchor rods; then an elliptical intersection line is projected on the tubular template using a line projector, and after drawing along the elliptical intersection line, it is cut to obtain the cutting end face of the sleeve welding end, thus completing the preparation of the sleeve template. (2) At the construction site, the horizontal template is detachably fixed to the underside of a transparent plate. The transparent plate is used to simulate the base plate. The tower center line is drawn on the transparent plate using a projection instrument. The tower center line is a diagonal line of the transparent plate. The foundation root opening of the transparent plate, the relative position of the transparent plate and the anchor bolt hole, and the height of the cut end face of the tubular template are measured. Then the position of the base plate is determined by the transparent plate. Then, draw the sleeve positioning line, the corresponding points of the anchor bolt holes, and the tower center line on the top of the sleeve template along the horizontal template. (3) In the factory, the sleeve template is placed on the vertical round pipe to be processed, with the cutting end face facing up. After marking the cutting end face, the vertical round pipe is cut to obtain the sleeve. (4) In the factory, weld and fix angle steel on one end face of the base plate, align the horizontal template with the other end face of the base plate, the tower center line is a diagonal line of the base plate, and weld and fix the cut end face of the sleeve with the sleeve positioning line to obtain the connecting base. (5) Send the connecting base to the construction site and connect it to the corresponding inclined single anchor bolt; In step (1), the method for drawing the elliptical intersection line is as follows: a horizontal line is projected onto the tubular template using a projector. The projection position of the horizontal line is determined according to the design elevation of the base plate. The horizontal line forms an elliptical intersection line on the tubular template.

2. The method for preparing a prefabricated helical anchor foundation according to claim 1, characterized in that: A first stiffening plate is welded and fixed to the pointed end of the outer side of the angle steel, and a second stiffening plate is welded and fixed to both sides of the angle steel. The lower ends of the first and second stiffening plates are welded and connected to the base plate.

3. The method for preparing a prefabricated helical anchor foundation according to claim 2, characterized in that: The angle bisectors of the first stiffening plate and the angle steel are on the same straight line, which is a pair of diagonals of the base plate.

4. The method for preparing a prefabricated helical anchor foundation according to claim 2, characterized in that: The second stiffening plate is in the same plane as the side wall of the angle steel, and extends from the side wall of the angle steel to the edge of the bottom plate.

5. The method for preparing a prefabricated helical anchor foundation according to claim 2, characterized in that: A first galvanized hole is provided at the intersection of the first stiffening plate, angle steel, and base plate; a second galvanized hole is provided at the intersection of the second stiffening plate, angle steel, and base plate.

6. The method for preparing a prefabricated helical anchor foundation according to claim 1, characterized in that, In step (1), the tubular template is provided with positioning holes, and the positions of the positioning holes correspond to the anchor bolt holes. The first positioning rod is used to pass through the positioning holes and the anchor bolt holes to position the tubular template on the inclined single anchor.

7. The method for preparing a prefabricated helical anchor foundation according to claim 1, characterized in that, In step (3), a sleeve bolt hole is opened at the position corresponding to the positioning hole on the vertical circular tube. The second positioning rod is used to pass through the positioning hole and the sleeve bolt hole to position the sleeve template on the vertical circular tube.

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