Self-drilling hollow anchor rod rapid construction tower foundation

Abstract

This utility model belongs to the field of communication tower foundation construction technology, specifically disclosing a self-drilling hollow anchor bolt rapid-construction tower foundation. The tower foundation includes a self-drilling hollow anchor bolt assembly, a pad plate, an I-shaped connector, fixing screws, and concrete filler. The anchor bolt assembly consists of multiple threaded hollow anchor bolts arranged in a ring, with an adjacent spacing of ≥20cm. The anchor bolts are splicable and have grouting holes at the bottom. The pad plate is located on top of the anchor bolt assembly and has reinforcing ribs at the bottom. The I-shaped connector includes a bottom plate, a top plate, and a connecting body, with a reinforcing plate between them. The bottom plate is fixed to the anchor bolts, and the top plate is connected to the tower flange via fixing screws. The concrete filler is poured on the outside of the I-shaped connector, above the pad plate, and below the tower flange, forming an integrated support. This utility model integrates drilling, grouting, and anchoring, offering efficient and low-cost construction. It is suitable for complex geological conditions and scenarios where large vehicles cannot pass, improving both connection strength and stability, and can meet the construction needs of lightweight communication towers ranging from 9 to 20 meters in height.

Description

Technical Field

[0001] This utility model belongs to the field of communication tower foundation construction technology, specifically relating to a self-drilling hollow anchor bolt for rapid tower foundation construction. Background Technology

[0002] In communication network construction, lightweight communication towers (such as single-tube towers, guyed towers, and H-poles) are widely used in urban fringe areas, rural areas, and complex terrain regions due to their simple structure and small footprint. The quality and efficiency of foundation construction for these towers directly determine the overall project progress and long-term safety.

[0003] Traditional lightweight communication tower foundation construction often employs large-scale excavation or pile foundation techniques, which have significant drawbacks. Firstly, traditional methods consume large amounts of concrete, resulting in high construction costs, long concrete curing periods, and severely slowing down construction progress. Furthermore, they rely on large equipment such as concrete mixer trucks, making construction difficult in mountainous or muddy terrain where large vehicles struggle to navigate. Secondly, traditional tower foundations use a single method for connecting anchor bolts to tower flanges. Due to anchor bolt spacing limitations, small tower flanges often cannot be directly bolted to anchor bolts, relying instead on simple connectors and bolts for fixation. This presents safety risks due to insufficient connection strength, especially in windy or geologically unstable areas, easily leading to tower tilting and swaying.

[0004] Furthermore, in complex geological conditions such as weak surrounding rock and fault fracture zones, traditional anchor bolt construction requires additional treatments such as casing protection and pre-grouting, which are cumbersome and costly. Improper handling may also lead to anchor hole collapse, affecting the anchoring effect. Therefore, there is an urgent need for a lightweight communication tower foundation technology that integrates efficient construction, strong adaptability, and high connection strength to solve the pain points of existing technologies. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides a self-drilling hollow anchor bolt for rapid tower foundation construction, which solves the problems of high cost, low efficiency, strong dependence on large equipment, high construction difficulty under complex geological conditions, and insufficient connection strength between the tower body and connecting parts in the construction of existing lightweight communication tower foundations.

[0006] This utility model is achieved through the following technical solution.

[0007] This utility model provides a self-drilling hollow anchor bolt rapid tower base, comprising: The self-drilling hollow anchor bolt assembly consists of multiple self-drilling hollow anchor bolts with threads on their outer surfaces arranged in a ring. The pad is fixedly installed on the upper part of the self-drilling hollow anchor bolt assembly. The pad is provided with multiple first through holes for the self-drilling hollow anchor bolt to pass through. An I-shaped connector is fixedly installed on the upper part of the self-drilling hollow anchor bolt assembly. The I-shaped connector is located above the pad plate. The I-shaped connector includes a bottom plate, a top plate, and a connecting body for connecting the bottom plate and the top plate. The bottom plate is provided with multiple second through holes for the self-drilling hollow anchor bolt to pass through. The bottom plate is fixedly connected to the self-drilling hollow anchor bolt. The top plate is used to fixally connect to the flange at the bottom of the communication tower. The top plate is provided with multiple connection holes that match the flange holes on the flange. The bottom plate is provided with first screw holes corresponding to the connection holes. The fixing screw is threaded to the first screw hole at its bottom and fixedly connected to the top plate and flange at its top.

[0008] As a further improvement to the above solution, the upper part of the self-drilling hollow anchor rod is threaded with a first upper nut and a first lower nut, and the pad and the base plate are fixed to the upper part of the self-drilling hollow anchor rod by the first upper nut and the first lower nut.

[0009] As a further improvement to the above solution, a second upper nut and a second lower nut are provided for the fixing screw, and the fixing screw is fixedly connected to the top plate and the flange through the second upper nut and the second lower nut.

[0010] As a further improvement to the above scheme, a reinforcing plate is connected between the bottom plate, the top plate, and the connecting body.

[0011] As a further improvement to the above scheme, the self-drilling hollow anchor bolt is made of stainless steel or low carbon steel, and the self-drilling hollow anchor bolt includes at least one self-drilling hollow anchor bolt.

[0012] As a further improvement to the above scheme, when the self-drilling hollow anchor bolt is composed of at least two self-drilling hollow anchor bolts spliced ​​together, the self-drilling hollow anchor bolts are connected to each other by an internally threaded connecting pipe, and at least one centerer is connected to the self-drilling hollow anchor bolt.

[0013] As a further improvement to the above scheme, a drill bit is installed at the bottom of the self-drilling hollow anchor rod, and the drill bit is constructed with a grouting hole that communicates with the internal channel of the self-drilling hollow anchor rod.

[0014] As a further improvement to the above scheme, at least two intersecting reinforcing ribs are provided at the bottom of the pad.

[0015] As a further improvement to the above scheme, the spacing between self-drilling hollow anchor rods should be at least 20cm.

[0016] As a further improvement to the above scheme, the communication tower is a lightweight communication tower with a height of 9-20m.

[0017] The beneficial effects of this utility model are: 1. Self-drilling hollow anchor bolts integrate drilling, grouting, and anchoring, eliminating the need for large amounts of concrete and embedded parts. Compared with traditional large-scale excavation or pile foundation processes, construction time is significantly shortened, concrete usage is significantly reduced, and construction costs are significantly lowered. Furthermore, small drilling machines can be used for construction, eliminating the need for large equipment and making it suitable for scenarios where large vehicles have difficulty moving.

[0018] 2. The anchor bolts can be spliced ​​and adjusted in length to adapt to different geological depths; the design of the drill bit and grouting hole, combined with the hollow structure of the anchor bolts, eliminates the need for special treatments such as casing protection and pre-grouting, and can form stable anchor holes under complex geological conditions such as weak surrounding rock and fault fracture zones, making it widely applicable.

[0019] 3. The reinforcing plates of the I-shaped connectors, the reinforcing ribs of the pads, and the double nut fixing method greatly improve the connection strength of the components; the combination of the fixing screw and the I-shaped connectors solves the problem of mismatch between the anchor bolt spacing and the flange hole spacing, eliminates the safety hazards of traditional simple connections, and ensures the long-term stability of the tower body.

[0020] 4. The material and length of the anchor bolts can be selected as needed. The I-shaped connectors and fixing bolts are compatible with flanges of different specifications of lightweight communication towers, which can meet the construction needs of lightweight communication towers with a height of 9~20m and are applicable to a variety of scenarios. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the self-drilling hollow anchor bolt quick-forming tower base in this utility model; Figure 2 This is a structural schematic diagram of the self-drilling hollow anchor bolt quick-forming tower base from another perspective in this utility model; Figure 3 This is a schematic diagram of the structure of the pad in this utility model; Figure 4 This is a structural schematic diagram of the I-shaped connector in this utility model; Figure 5 This is a schematic diagram of the centering device in this utility model. Figure 6 This is the structural intent of the drill bit in this utility model.

[0022] In the diagram, 1. Self-drilling hollow anchor rod; 101. Single self-drilling hollow anchor rod; 2. Pad plate; 201. First through hole; 202. Reinforcing rib; 3. I-shaped connector; 301. Base plate; 302. Top plate; 303. Connector; 304. Second through hole; 305. Connecting hole; 306. First screw hole; 4. Fixing screw; 5. First upper nut; 6. First lower nut; 7. Second upper nut; 8. Second lower nut; 9. Reinforcing plate; 10. Internally threaded connecting pipe; 11. Centerer; 12. Drill bit; 1201. Grouting hole. Detailed Implementation

[0023] To further illustrate the technical solution of this utility model, the following description is provided in conjunction with the accompanying drawings and embodiments.

[0024] like Figures 1 to 5 As shown, a self-drilling hollow anchor bolt quick-forming tower base includes a self-drilling hollow anchor bolt assembly, a pad plate 2, an I-shaped connector 3, and a fixing screw 4. It can also be configured with auxiliary components such as an internal threaded connecting pipe 10, a centering device 11, and a drill bit 12 as needed. All components work together to achieve the integrated functions of drilling, grouting, anchoring, and tower body connection.

[0025] The self-drilling hollow anchor bolt group consists of multiple self-drilling hollow anchor bolts 1 with threads on the outer surface arranged in a ring. The distance between adjacent self-drilling hollow anchor bolts 1 is at least 20cm to ensure anchoring stability. The number of self-drilling hollow anchor bolts 1 can be selected according to actual needs.

[0026] The self-drilling hollow anchor rod 1 can be made of stainless steel or low carbon steel. It can be composed of a single self-drilling hollow anchor rod 101 or at least two self-drilling hollow anchor rods 101 spliced ​​together by an internal threaded connecting pipe 10. The splicing design can flexibly adjust the total length of the anchor rod according to the geological depth to adapt to different construction needs.

[0027] A drill bit 12 is installed at the bottom of the self-drilling hollow anchor rod 1. The drill bit 12 is provided with a grouting hole that communicates with the inner channel of the self-drilling hollow anchor rod 1. This facilitates the drilling of the self-drilling hollow anchor rod 1 into the rock strata and enables high-pressure grouting through the inner channel. The grout fills the anchor hole and the voids in the rock mass through the grouting hole, improving the anchoring effect. At least one centering device 11 can also be connected to the self-drilling hollow anchor rod 1 to ensure that the self-drilling hollow anchor rod 1 is always in the center of the anchor hole during drilling and grouting, avoiding the impact of the self-drilling hollow anchor rod 1's displacement on the anchoring quality.

[0028] The pad 2 is fixedly installed on the upper part of the self-drilling hollow anchor bolt group 1. The pad 2 has multiple first through holes 201 for the self-drilling hollow anchor bolts 1 to pass through. After the self-drilling hollow anchor bolts 1 pass through the first through holes 201, the pad 2 is fixed in position by nuts. The bottom of the pad 2 is provided with at least two intersecting reinforcing ribs 202. The reinforcing ribs 202 enhance the load-bearing capacity of the pad 2, prevent the pad 2 from deforming under pressure, and further improve the overall stability of the tower foundation. The I-shaped connector 3, located above the pad 2 and fixedly connected to the self-drilling hollow anchor bolt assembly, is the core component connecting the self-drilling hollow anchor bolt 1 to the tower flange. It includes a base plate 301, a top plate 302, and a connector 303. The base plate 301 has multiple second through holes 304 through which the self-drilling hollow anchor bolt 1 passes and is fixed to the base plate 301. The top plate 302 connects to the bottom flange of the communication tower and has multiple connection holes 305 matching the flange holes. The base plate 301 has a first screw hole 306 corresponding to the connection holes 305 for connecting and fixing the screw rod 4. Furthermore, a reinforcing plate 9 connects the base plate 301, top plate 302, and connector 303. The reinforcing plate 9 enhances the connection strength, preventing the I-shaped connector 3 from bending or breaking due to uneven stress, thus solving the problem of insufficient strength in traditional simple connectors.

[0029] The fixing screw 4 is threaded to the first screw hole 306 of the base plate 301 at its bottom, and passes through the connecting hole 305 of the top plate 302 and the flange hole of the tower flange at its top, and is then fixed with a nut. The fixing screw 4, together with the I-shaped connector 3, achieves indirect fixing between the tower flange and the self-drilling hollow anchor bolt assembly. Even if the spacing of the self-drilling hollow anchor bolt assembly does not match the spacing of the flange holes, the connection can be completed by adjusting the position of the fixing screw 4, adapting to the flanges of different specifications of lightweight communication towers.

[0030] The self-drilling hollow anchor rod 1 has a threaded connection between the first upper nut 5 and the first lower nut 6. The pad 2 and the base plate 301 are sandwiched between the first upper nut 5 and the first lower nut 6. The pad 2 and the base plate 301 are fixed by tightening the two nuts. The fixing screw 4 is equipped with a second upper nut 7 and a second lower nut 8. The top plate 302 and the tower flange are sandwiched between the second upper nut 7 and the second lower nut 8. Tightening the two nuts can firmly fix the top plate 302 and the flange. The double nut fixing design further improves the connection reliability and prevents the nuts from loosening due to vibration during long-term use. The first upper nut 5 and the second upper nut 7 in each set are both double nut designs, which further improves the connection stability.

[0031] Among them, the lightweight communication tower is a single-tube tower, guyed tower or H-pole with a height of 9 to 20m, such as a single-tube tower, guyed tower or H-pole with a height of 9m, 12m, 15m or 20m.

[0032] Furthermore, it also includes a concrete filler. After the tower flange, I-shaped connector 3, and top plate 302 are fixed with fixing bolts 4, concrete filler is poured on the outside of I-shaped connector 3, above pad 2, and in the lower area of ​​the tower flange using a surrounding plate. The filler covers the entire I-shaped connector 3, and it must be ensured that the top of the concrete filler is at least flush with the lower surface of the tower flange. The concrete filler further enhances the load-bearing capacity and deformation resistance at the connection between the tower base and the tower flange, fills the gap between the I-shaped connector 3 and the surrounding structure, and improves the overall stability of the tower base.

[0033] The present invention provides a method for rapidly constructing tower foundations using self-drilling hollow anchor bolts: The material, length, and quantity of anchor bolts are determined based on the geological conditions of the construction area (such as the depth of the rock strata and whether it is a fracture zone) and the height of the lightweight communication tower (9~20m).

[0034] The drilling rig drives the self-drilling hollow anchor rod 1 to rotate and drill, using the penetrating force of the drill bit 12 to penetrate through the surface soil or broken rock layer until the bottom of the self-drilling hollow anchor rod 1 is deeply embedded in the stable rock layer. During the drilling process, the centering device 11 ensures that the self-drilling hollow anchor rod 1 is always centered in the anchor hole to avoid displacement. If the length of the self-drilling hollow anchor rod 1 is insufficient, the individual self-drilling hollow anchor rods 101 can be spliced ​​together using the internally threaded connecting pipe 10 to extend the overall length of the self-drilling hollow anchor rod 1.

[0035] After drilling stops, grout is injected through the inner channel of the self-drilling hollow anchor rod 1. The grout flows out through the grouting hole 1201 of the drill bit 12, filling the gap between the anchor hole and the self-drilling hollow anchor rod 1, as well as the cracks in the surrounding rock mass. The high-pressure grouting state is maintained until the grout overflows from the top of the anchor hole to ensure full grouting. Then, the grout is left to solidify.

[0036] After the mortar has solidified, clean the exposed threaded portion of the self-drilling hollow anchor rod 1, screw in the first lower nut 6, align the first through hole 201 of the pad 2 with the self-drilling hollow anchor rod 1, and slip it onto the upper part of the self-drilling hollow anchor rod 1; then align the second through hole 304 on the bottom plate 301 of the I-shaped connector 3 with the self-drilling hollow anchor rod 1, and slip it over the pad 2; screw in the first upper nut 5 at the threaded part of the self-drilling hollow anchor rod 1, and tighten it downwards until it fits the top of the bottom plate 301. Through the clamping force of the first upper nut 5 and the first lower nut 6, the pad 2 and the bottom plate 301 of the I-shaped connector 3 are firmly fixed to the self-drilling hollow anchor rod 1.

[0037] Lift the lightweight communication tower body and align the flange hole of the bottom flange of the tower body with the connection hole 305 of the top plate 302 of the I-shaped connector 3; if there is a deviation between the position of the flange hole and the connection hole 305, the position of the tower body can be finely adjusted to ensure that the two are aligned.

[0038] Screw the bottom of the fixing screw 4 into the first screw hole 306 of the base plate 301, and the upper part passes through the second lower nut 8, the connecting hole 305 of the top plate 302 and the flange hole of the flange in sequence; screw the second upper nut 7 into the upper part of the fixing screw 4, tighten the second lower nut 8 upwards until it fits the bottom of the top plate 302, and tighten the second upper nut 7 downwards until it fits the top of the flange. Through the clamping force of the second upper nut 7 and the second lower nut 8, the flange is fixed to the top plate 302 of the I-shaped connector 3.

[0039] Check that all nuts are tightened. A torque wrench can be used to tighten them to the designed torque value to ensure that there is no looseness. If further stability is required, a small amount of concrete can be poured around the pad 2 and the I-shaped connector 3 as a filler to form an auxiliary support structure.

[0040] A testing device consisting of a through-hole jack and a cross brace beam is used to conduct pull-out tests on any two self-drilling hollow anchor rods 1 to check whether the anchoring force meets the design requirements (usually ≥50kN). If the anchoring force is insufficient, the grouting situation needs to be re-checked, and additional grouting should be added if necessary. Check whether the reinforcing plate 9 of the I-shaped connector 3 and the reinforcing rib 202 of the pad 2 are deformed, and whether the connection between the fixing screw 4 and the nut is firm. After ensuring that all components are undamaged and not loose, the tower foundation construction is completed.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A self-drilling hollow anchor rod rapid foundation pile, characterized in that, include: The self-drilling hollow anchor bolt group is composed of multiple self-drilling hollow anchor bolts (1) with threads on their outer surfaces arranged in a ring. The pad (2) is fixedly installed on the upper part of the self-drilling hollow anchor bolt assembly. The pad (2) is provided with a plurality of first through holes (201) through which the self-drilling hollow anchor bolt (1) can pass. I-shaped connector (3), the I-shaped connector (3) is fixedly installed on the upper part of the self-drilling hollow anchor bolt assembly, the I-shaped connector (3) is located above the pad plate (2), the I-shaped connector (3) includes a bottom plate (301), a top plate (302) and a connecting body (303) for connecting the bottom plate (301) and the top plate (302), the bottom plate (301) is provided with a plurality of second through holes (304) through which the self-drilling hollow anchor bolt (1) can pass, the bottom plate (301) is fixedly connected to the self-drilling hollow anchor bolt (1), the top plate (302) is used to be fixedly connected to the flange at the bottom of the communication tower, the top plate (302) is provided with a plurality of connecting holes (305) matching the flange holes on the flange, the bottom plate (301) is provided with a first screw hole (306) corresponding to the connecting holes (305). The fixing screw (4) is threaded to the bottom of the first screw hole (306) and fixedly connected to the top plate (302) and the flange at the top.

2. A self-drilling hollow anchor rod rapid foundation pile according to claim 1, characterized in that, The upper part of the self-drilling hollow anchor rod (1) is threaded with a first upper nut (5) and a first lower nut (6). The pad (2) and the base plate (301) are fixed to the upper part of the self-drilling hollow anchor rod (1) by the first upper nut (5) and the first lower nut (6).

3. A self-drilling hollow anchor rod rapid foundation pile according to claim 1, characterized in that, A second upper nut (7) and a second lower nut (8) are provided corresponding to the fixing screw (4). The fixing screw (4) is fixedly connected to the top plate (302) and the flange through the second upper nut (7) and the second lower nut (8).

4. A self-drilling hollow anchor rod rapid foundation pile according to claim 1, characterized in that, A reinforcing plate (9) is connected between the bottom plate (301), the top plate (302), and the connecting body (303).

5. A self-drilling hollow anchor rod rapid foundation pile according to claim 1, characterized in that, The self-drilling hollow anchor rod (1) is made of stainless steel or low carbon steel, and the self-drilling hollow anchor rod (1) includes at least one self-drilling hollow anchor rod (101).

6. A self-drilling hollow anchor rod rapid foundation pile according to claim 1, characterized in that, When the self-drilling hollow anchor rod (1) is composed of at least two self-drilling hollow anchor rods (101) spliced ​​together, the self-drilling hollow anchor rods (101) are connected to each other by an internal threaded connecting pipe (10), and at least one centerer (11) is connected to the self-drilling hollow anchor rod (1).

7. A self-drilling hollow anchor bolt rapid tower base according to claim 1, characterized in that, The bottom of the self-drilling hollow anchor rod (1) is equipped with a drill bit (12), and the drill bit (12) is constructed with a grouting hole (1201) that communicates with the inner channel of the self-drilling hollow anchor rod (1).

8. A self-drilling hollow anchor rod rapid foundation pile according to claim 1, characterized in that, The bottom of the pad (2) is provided with at least two intersecting reinforcing ribs (202).

9. A self-drilling hollow anchor rod rapid foundation pile according to claim 1, characterized in that, The spacing between the self-drilling hollow anchor rods (1) is at least 20cm.

10. A self-drilling hollow anchor rod rapid foundation pile according to claim 1, characterized in that, The communication tower is a lightweight communication tower with a height of 9 to 20 meters.

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