Device for improving horizontal bearing capacity of single anchor foundation of spiral anchor

Abstract

The utility model provides a device for improving the horizontal bearing capacity of a single anchor foundation of a spiral anchor, which belongs to the technical field of foundation design and construction of power transmission line engineering and comprises an anchor rod penetrating through a foundation pit and inserted into soil below the foundation pit and an anchor disc sleeved on the anchor rod, one end of the anchor rod is provided with an anchor head, and the other end of the anchor rod is provided with a tower foot plate. The anchor rod is characterized in that the anchor rod is sleeved with a sleeve, part of the sleeve is inserted into soil below a foundation pit, and the remaining sleeve is located in the foundation pit; and the protective cap is used for fixedly connecting the anchor rod and the sleeve which are positioned in the foundation pit with the foundation pit. The protective cap and the sleeve are fixedly connected with the anchor rod, so that the contact area between the anchor rod and soil is increased, and the horizontal bearing capacity of the anchor rod is further increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of power transmission line engineering foundation design and construction, and specifically relates to a device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation. Background Art

[0002] Conventional transmission line spiral anchor single anchor foundation consists of anchor rod, anchor plate and anchor head. However, since the spiral anchor is a slender steel rod structure, it is relatively thin and soft as a whole, so it has poor bending stiffness and low horizontal bearing capacity. When subjected to horizontal loads, it is easy to produce large horizontal displacement. Due to the wind load and the tension of the ground wire, the transmission line tower will have a large horizontal load when it is transferred to the foundation. At this time, the top of the spiral anchor single anchor foundation will produce a large horizontal displacement, which is not conducive to the force of the tower. There are usually two ways to offset the horizontal load transmitted by the tower. One is to use the oblique arrangement method with the same inclination angle of the spiral anchor and the main material of the tower leg, but the construction process is more complicated, the tilt positioning time is longer, and the precision requirements are higher. The second is to use a group anchor foundation, which will significantly increase the amount of steel and the cost. Utility Model Content

[0003] The utility model is to solve the problem that the existing technology adopts the oblique arrangement method of the spiral anchor and the main material of the tower leg with the same inclination angle, but the construction process is complicated, the tilt positioning time is long, and the precision requirement is high. At the same time, in order to solve the problem that the steel consumption and cost will increase significantly when using a group anchor foundation, a device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation is provided. In the utility model, the horizontal bearing performance of the anchor rod can be greatly improved through the mutual cooperation of the sleeve and the concrete protective cap.

[0004] The technical solution adopted by the utility model for improving the horizontal bearing capacity of the spiral anchor single anchor foundation is:

[0005] The utility model provides a device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation, comprising an anchor rod which penetrates a foundation pit and is inserted into the soil below the foundation pit and an anchor plate which is sleeved on the anchor rod, one end of the anchor rod is provided with an anchor head, and the other end of the anchor rod is provided with a tower foot plate, and is characterized in that: the anchor rod is sleeved with a sleeve, part of the sleeve is inserted into the soil below the foundation pit, and the remaining sleeve is located in the foundation pit; and also comprises a protective cap which fixes the anchor rod and the sleeve located in the foundation pit to the foundation pit.

[0006] A further improvement of the technical solution of the utility model is that a plurality of supporting ribs are arranged between the tower base plate and the anchor rod, and the plurality of supporting ribs are evenly arranged circumferentially at one end where the anchor rod and the tower base plate are connected, and each supporting rib is fixedly connected to the anchor rod and the tower base plate.

[0007] A further improvement of the technical solution of the utility model is that a plurality of anchor plates are evenly arranged along the length of the anchor rod.

[0008] A further improvement of the technical solution of the utility model is that a sawtooth structure is provided at one end of the sleeve located in the soil, and a plurality of groups of connection structures are circumferentially provided on the side wall of the portion of the sleeve located in the foundation pit, and each group of connection structures includes a plurality of bolt holes arranged in sequence from top to bottom.

[0009] A further improvement of the technical solution of the utility model is that the protective cap is a concrete protective cap, which fills the foundation pit and is higher than the foundation pit, and the anchor rod and the part of the sleeve located in the foundation pit and the tower foot plate are all located in the concrete protective cap.

[0010] A further improvement of the technical solution of the utility model is that the diameter of the sleeve is smaller than the diameter of the foundation pit, the top of the sleeve is lower than the height of the ground, and the tower foot plate is higher than the height of the ground.

[0011] A further improvement of the technical solution of the utility model is that the diameter of the sleeve is larger than the diameter of the circumscribed circle of the tower foot plate.

[0012] The beneficial effects of the utility model are:

[0013] 1. In the device for improving the horizontal bearing capacity of the spiral anchor single anchor foundation, the sleeve and the anchor rod can be fixedly connected to the foundation pit through the provision of a concrete protective cap, thereby increasing the contact area between the anchor rod and the soil, and can improve the horizontal bearing capacity of the anchor rod, thereby reducing the horizontal displacement of the anchor rod. Compared with the arrangement of the single anchor in the traditional technology, the utility model can reduce the displacement in the horizontal direction by 60%.

[0014] 2. In the device for improving the horizontal bearing capacity of the single-anchor spiral anchor foundation, it is only necessary to excavate the foundation pit and then insert the anchor rod into the foundation pit, and at the same time, set the sleeve on the anchor rod, and then pour the concrete protective cap. It does not require high precision. Therefore, compared with the traditional technology that adopts the oblique arrangement method with the same inclination angle between the spiral anchor and the main material of the tower leg, the utility model can simplify the construction process and shorten the arrangement time.

[0015] 3. In the device for improving the horizontal bearing capacity of the spiral anchor single anchor foundation, only a single anchor rod, a sleeve and a concrete protective cap are needed to enhance the horizontal bearing capacity of the single anchor rod. Therefore, compared with the traditional technology of using a group anchor foundation, the utility model can reduce the amount of steel used, thereby further reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation provided by an embodiment of the utility model;

[0017] Figure 2It is a schematic diagram of foundation pit excavation of a device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation provided by an embodiment of the utility model;

[0018] Figure 3 It is a schematic diagram of a sleeve screwed into place for a device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation provided by an embodiment of the utility model;

[0019] Figure 4 It is a schematic structural diagram of a sleeve of a device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation provided by an embodiment of the utility model;

[0020] Figure 5 The utility model is provided in an embodiment of the present invention, which is a schematic diagram of the top view of the structure of a sleeve and a concrete protective cap of a device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation.

[0021] In the attached figure: 1. anchor rod; 2. anchor plate; 3. anchor head; 4. sleeve; 5. serrated structure; 6. bolt hole; 7. concrete protective cap; 8. tower base plate; 9. connection structure; 10. ground; 11. supporting ribs; 12. foundation pit. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. In the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0023] Embodiment 1

[0024] First reference Figure 1 ,according to Figure 1 It can be seen that the utility model includes an anchor rod 1, one end of which is fixedly provided with an anchor head 3, the other end of which is fixedly provided with a tower foot plate 8, and the side wall of the anchor rod 1 is located between the anchor head 3 and the anchor rod 1 and is fixedly provided with multiple anchor plates 2.

[0025] In the present invention, in order to enable the anchor rod 1 to provide greater support to the tower foot plate 8 and the tower foot above, reference Figure 1 , Figure 2 and Figure 3 It can be seen that a plurality of support ribs 11 are arranged between the tower base plate 8 and the top end of the anchor rod 1. The plurality of support ribs 11 are evenly arranged circumferentially at the top end of the anchor rod 1, and each support rib 11 is fixedly connected to the anchor rod 1 and the tower base plate 8, so that the support ribs 11 can provide greater support force to the tower base plate 8 and the tower base above.

[0026] refer to Figure 1 and Figure 2It can be seen that when the utility model is used, first a cylindrical foundation pit 12 is excavated at the location where the foot of the transmission tower is installed, and then the anchor head 3 is aligned with the center of the foundation pit 12, and the anchor rod 1 is rotated. The rotating anchor rod 1 drives the anchor head 3 and the anchor plate 2 to rotate until the anchor head 3 and all the anchor plates 2 are rotated into the soil below the foundation pit 12. At this time, part of the upper anchor rod 1 and the tower foot plate 8 are located in the foundation pit 12, and the top of the anchor rod 1 and the tower foot plate 8 are both higher than the ground 10, so that it is convenient to install the foot of the transmission tower on the tower foot plate 8.

[0027] Continue to refer Figure 1 The outer sleeve of the anchor rod 1 is provided with a sleeve 4. In order to ensure the strength of the sleeve 4, the sleeve 4 can be made of steel. At the same time, the sleeve 4 should be hot-dip galvanized to prevent the sleeve 4 from being corroded; continue to refer to Figure 3 and Figure 4 It can be seen that a sawtooth structure 5 is provided at one end of the sleeve 4, and a plurality of groups of connection structures 9 are circumferentially provided at the other end of the sleeve 4, and each group of connection structures 9 includes a plurality of bolt holes 6 uniformly arranged in sequence from top to bottom.

[0028] refer to Figure 5 It can be seen that the diameter of the sleeve 4 is smaller than the diameter of the foundation pit 12 , and the diameter of the sleeve 4 is larger than the diameter of the circumscribed circle of the tower foot plate 8 .

[0029] After the anchor rod 1 is inserted into the foundation pit 12, the sleeve 4 is connected to the screw drill bit through the bolt hole 6, and then the sleeve 4 is put into the foundation pit 12 and sleeved on the outside of the anchor rod 1. The sleeve 4 is driven to rotate by the screw drill bit, so that the sleeve 4 is inserted into the soil below the foundation pit 12 until the top of the sleeve 4 is lower than the ground 10. Through the inserted sleeve 4, the soil inside the sleeve 4 and the anchor rod 1 can be formed into a whole, and the sleeve 4 can increase the contact area between the anchor rod 1 and the soil, thereby improving the horizontal bearing capacity of the anchor rod 1.

[0030] In this embodiment, the sleeve 4 is preferably 2m in height and 10mm in wall thickness. At the same time, the diameter of each bolt hole 6 is preferably 21.5㎜. The top bolt hole 6 in each group of connecting structures 9 is preferably 40㎜ away from the top of the sleeve 4. The distance between two adjacent bolt holes 6 in each group of connecting structures 9 is preferably 60㎜.

[0031] Embodiment 2

[0032] refer to Figure 1 and Figure 5 It can be seen that the second embodiment adds a concrete protective cap 7 on the basis of the first embodiment. The concrete protective cap 7 fills the foundation pit 12 and is higher than the foundation pit 12 . The minimum diameter of the concrete protective cap 7 should be the same as the diameter of the foundation pit 12 .

[0033] When this embodiment is used, after the sleeve 4 in the first embodiment is installed in place, the transmission tower is installed above the tower foot plate 8. After the transmission tower is installed, a concrete template is built above the foundation pit 12, and then concrete is poured into the foundation pit 12 and the concrete template. The concrete fills the internal space of the foundation pit 12 and the concrete template. At this time, the concrete wraps the transmission tower foot, the tower foot plate 8, the part of the sleeve 4 located in the foundation pit 12, and the part of the anchor rod 1 located in the foundation pit 12. When the concrete solidifies, a concrete protective cap 7 is formed. The concrete protective cap 7 fixes the transmission tower foot, the tower foot plate 8, the part of the sleeve 4 located in the foundation pit 12, and the part of the anchor rod 1 located in the foundation pit 12 to the foundation pit 12 as a whole, further increasing the contact area between the anchor rod 1 and the soil, thereby further improving the horizontal bearing capacity of the anchor rod 1.

[0034] In this embodiment, the minimum diameter of the concrete protective cap 7 is the diameter of the circumscribed circle of the tower foot plate 8 plus 100 mm, the height is preferably 1.2 m, and the diameter of the sleeve 4 is preferably 80 mm smaller than the diameter of the concrete protective cap 7 .

[0035] In the above embodiment, the utility model provides a device for improving the horizontal bearing capacity of a single spiral anchor foundation. By setting a concrete protective cap, the sleeve and the anchor rod can be fixedly connected to the foundation pit, thereby increasing the contact area between the anchor rod and the soil, and improving the horizontal bearing capacity of the anchor rod, thereby reducing the horizontal displacement of the anchor rod. Compared with the arrangement of a single anchor in traditional technology, the utility model can reduce the displacement in the horizontal direction by 60%; at the same time, compared with the traditional technology of using an oblique arrangement of the spiral anchor and the main material of the tower leg at the same inclination angle, the utility model can simplify the construction process and shorten the arrangement time; at the same time, compared with the traditional technology of using a group anchor foundation, the utility model can reduce the amount of steel used, thereby further reducing the cost.

[0036] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents of the present invention for protection have been fully recorded in the claims.

Claims

1. A device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation, comprising an anchor rod (1) penetrating a foundation pit (12) and inserted into the soil below the foundation pit (12) and an anchor plate (2) sleeved on the anchor rod (1), wherein one end of the anchor rod (1) is provided with an anchor head (3), and the other end of the anchor rod (1) is provided with a tower foot plate (8), characterized in that: The anchor rod (1) is sleeved with a sleeve (4), part of the sleeve (4) is inserted into the soil below the foundation pit (12), and the remaining sleeve (4) is located in the foundation pit (12); and a protective cap is also included for fixing the anchor rod (1) and the sleeve (4) located in the foundation pit (12) to the foundation pit (12).

2. A device for improving the horizontal bearing capacity of a single-anchor foundation of a spiral anchor according to claim 1, characterized in that: A plurality of supporting ribs (11) are arranged between the tower base plate (8) and the anchor rod (1); the plurality of supporting ribs (11) are evenly arranged circumferentially at one end where the anchor rod (1) and the tower base plate (8) are connected; and each supporting rib (11) is fixedly connected to the anchor rod (1) and the tower base plate (8).

3. The device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation according to claim 1, characterized in that: A plurality of anchor plates (2) are evenly arranged along the length of the anchor rod (1).

4. The device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation according to claim 1, characterized in that: A sawtooth structure (5) is provided at one end of the sleeve (4) located in the soil, and a plurality of groups of connection structures (9) are provided circumferentially on the side wall of the portion of the sleeve (4) located in the foundation pit (12), and each group of connection structures (9) includes a plurality of bolt holes (6) arranged in sequence from top to bottom.

5. The device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation according to claim 1, characterized in that: The protective cap is a concrete protective cap (7), which fills the foundation pit (12) and is higher than the foundation pit (12), and the anchor rod (1) and the sleeve (4) are located in the foundation pit (12) and the tower foot plate (8) are all located in the concrete protective cap (7).

6. A device for improving the horizontal bearing capacity of a single-anchor foundation of a spiral anchor according to any one of claims 1 to 5, characterized in that: The diameter of the sleeve (4) is smaller than the diameter of the foundation pit (12), the top of the sleeve (4) is lower than the height of the ground (10), and the tower foot plate (8) is higher than the height of the ground (10).

7. A device for improving the horizontal bearing capacity of a spiral anchor single anchor foundation according to claim 6, characterized in that: The diameter of the sleeve (4) is greater than the diameter of the circumscribed circle of the tower foot plate (8).

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