A communication tower pipe pile foundation

Abstract

The present invention relates to a communication tower pipe pile foundation in the field of fixed building foundations. By means of an embedded tube pre-buried in a foundation body and a shear tube nested in the embedded tube and extending into the tower body, when the tower body swings, the shear tube is used to transfer the horizontal shear force exerted on the tower body to the embedded tube. By means of the large axial contact area between the tower body and the embedded tube and the shear tube, the horizontal shear force exerted on the welded bolts is reduced, and the problem of excessive stress concentration on the embedded bolts is overcome. At the same time, by means of an inclined anchor rod arranged at the lower part of the foundation body, the gripping force of the foundation body when subjected to the inertia of swinging is enhanced, the stability of the foundation body is improved, and the horizontal shear force is better offset. In addition, by means of a shock-absorbing ring arranged between the shear tube and the embedded tube, the vibration of the welded bolts installed on the upper part of the embedded tube is reduced, and the stability of the connection between the tower body and the foundation body is improved.

Description

Technical Field

[0001] The present invention relates to a communication tower base foundation, in particular to a communication iron tower pipe pile foundation used in the field of fixed building foundations. Background Art

[0002] The pipe pile foundation of a communication tower is a key structure ensuring its stability. It consists of high-strength pipe piles, a cap (as needed), tie beams (optional), and foundation soil. The pipe piles are driven directly into the ground, bearing and transmitting the weight of the tower as well as wind and seismic loads to the foundation soil, ensuring the tower's safety. If a cap is installed, it connects multiple pipe piles to enhance overall stability and load-bearing capacity. Tie beams reduce lateral displacement between pipe piles and improve anti-overturning capabilities. As the ultimate bearing layer, the properties of the foundation soil directly affect foundation performance.

[0003] Existing communication pipe pile foundations generally use pre-buried bolts embedded in the foundation to fix the tower body. In windy weather, the wind pushes the tower top to swing back and forth. Since the tower body and the pipe pile foundation are completely connected by pre-buried bolts, the swinging of the tower top causes the tower body to generate a large horizontal shear force on the pre-buried bolts. The pre-buried bolts are subjected to a large force, resulting in excessive stress concentration on the pre-buried bolts, which can easily cause the pre-buried bolts to break. At the same time, as the tower top sways, the pre-buried bolts vibrate more. The vibration of the pre-buried bolts not only easily causes extrusion and damage to the cement layer of the pipe pile foundation, but also makes the bolts easily loose and detach.

[0004] The existing Chinese patent publication number CN219826378U discloses a communication tower pipe pile foundation, and specifically discloses that it includes a base, the four corners of the bottom of the base are connected to embedded columns, the top center of the base is opened with a limit groove, the limit groove is inserted into the pipe pile, the lower part of the outer wall of the pipe pile is circumferentially connected to four guide bars, the outside of the four guide bars is jointly provided with a lifting seat, the top four corners of the base are hinged with diagonal braces, the middle part of the diagonal brace is hinged with a traction rod between the outer wall of the lifting seat, the upper end of the diagonal brace is hinged with a side bracket, the outer wall of the side bracket is connected to an arc seat, and the outer wall of the pipe pile is connected to a flange.

[0005] In the technical solution of this patent, horizontally arranged positioning columns are used to limit the horizontal position of the tower body. Although part of the stress is dispersed by the diagonal support rods when the tower body swings, the pressure will still be transmitted through the positioning columns at the bottom of the tower body, which will still cause the positioning columns at the connection position of the tower body and the base to be subjected to greater stress. In addition, when the tower body swings and vibrates, the positioning columns will also vibrate, affecting the rigidity of the positioning columns. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing communication tower pipe pile foundation uses embedded bolts to connect the tower body. When the tower body swings, the embedded bolts are subjected to concentrated force and are prone to breakage and damage to the concrete layer.

[0007] In order to solve the above problems, the present invention provides a communication tower pipe pile foundation, including a basic body for installing the tower body, a pre-buried tube is embedded in the basic body, and a shear tube extending to the interior of the tower body and abutting the inner wall of the tower body is nested in the pre-buried tube; the upper part of the pre-buried tube is fixedly connected to a semi-buried flange extending to the top of the basic body, and the upper end face of the semi-buried flange is welded with welding bolts equidistantly distributed around the circumference, and the lower part of the tower body is provided with a mounting flange arranged opposite to the semi-buried flange, and the welding bolts pass through the mounting flange and are threadedly connected with locking nuts; a shock-absorbing ring is sleeved on the middle part of the shear tube and abuts the inner wall of the pre-buried tube, and oblique anchor rods equidistantly distributed around the circumference are nested in the lower part of the basic body, the oblique anchor rods extend into the pre-buried tube and are hinged with connecting rods, and the upper end of the connecting rods is hinged with a sliding disk slidably connected to the inner wall of the pre-buried tube, and the sliding disk abuts the lower end of the shear tube.

[0008] In the above-mentioned communication tower pipe pile foundation, the uniform transmission of the swing torque is achieved by the embedded tube set in the foundation and the shear tube inserted in the embedded tube and the tower body, thereby reducing the stress concentration of the embedded bolts.

[0009] As a further improvement of the present application, a buffer cylinder is installed at the lower part of the embedded cylinder, and a piston disk vertically slidingly connected to it is nested in the buffer cylinder. Evenly distributed flow holes are provided on the surface of the piston disk. A traction rope is fixedly connected to the upper end of the piston disk. The traction rope extends into the tower body and is fixedly connected to the inner wall of the tower body and the top of the tower. The buffer cylinder is filled with hydraulic oil.

[0010] As a further improvement of the present application, the welding bolt is fixed to the semi-buried flange by welding, and a rectangular groove opposite to the welding bolt is provided on the mounting flange, a shock-absorbing block is nested in the rectangular groove, and a center hole for the welding bolt to pass through is provided in the middle of the shock-absorbing block, and the rectangular groove is covered with a mounting plate abutting the locking nut, and the vertical projection area of the mounting plate is larger than the vertical projection area of the rectangular groove.

[0011] As a further improvement of the present application, the embedded tube is a vertically arranged stepped cylindrical structure, the semi-buried flange is an annular flange integrally formed with the embedded tube, a nesting cavity connected to the semi-buried flange is opened at the upper part of the embedded tube, and a plug-in cavity with a different radius is connected below the nesting cavity. The shock-absorbing ring is nested in the nesting cavity, and the vertical height of the shock-absorbing ring is lower than the vertical height of the nesting cavity.

[0012] As a further improvement of the present application, the shear tube is a stepped conical tube structure, the upper part of which is an upper plug-in tube nested in the tower body, the middle part is a nested tube nested in the shock-absorbing ring, and the lower part is a lower plug-in tube inserted in the plug-in cavity and abutted against the inner wall of the plug-in cavity. The diameters of the upper plug-in tube, the nested tube and the lower plug-in tube are not equal.

[0013] As a further improvement of the present application, the foundation body includes a pedestal wrapped around the outside of the embedded tube and cast in one piece with concrete, and a pile body underneath it. The pedestal is a stepped conical tube structure, the pile body is a vertical cylindrical structure, and the embedded tube is located inside the pedestal and is fixedly connected to the embedded plate.

[0014] As a further improvement of the present application, the inclined anchor rod is a strip-shaped rod with a pointed outer end. Both the pile body and the embedded tube are provided with through holes for the inclined anchor rod to pass through. The sliding disk is a disc-shaped structure and is nested in the plug-in cavity.

[0015] As a further improvement of the present application, the shear tube is provided with a through hole for the traction rope to pass through, the inner diameter of the through hole is larger than the diameter of the traction rope, and the lower part of the embedded tube is provided with a receiving cavity for accommodating the buffer tube.

[0016] To sum up, the present invention uses an embedded tube embedded in the foundation body and a shear tube nested in the embedded tube and extending into the tower body. When the tower body swings, the shear tube is used to transfer the horizontal shear force exerted on the tower body to the embedded tube. The large axial contact area between the tower body and the embedded tube and the shear tube is used to reduce the horizontal shear force exerted on the welded bolts, thereby overcoming the problem of excessive stress concentration on the embedded bolts. At the same time, by means of the inclined anchor rods arranged at the lower part of the foundation body, the grip of the foundation body when subjected to the inertia of swinging is enhanced, the stability of the foundation body is improved, and the horizontal shear force has a better offsetting effect. In addition, by means of the shock-absorbing ring arranged between the shear tube and the embedded tube, the vibration transmitted from the tower body to the shear tube is absorbed, the vibration of the embedded tube is reduced, and then the vibration of the welded bolts installed on the upper part of the embedded tube is reduced, thereby improving the stability of the connection between the tower body and the foundation body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the connection between the pipe pile foundation and the tower body in this application;

[0018] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure;

[0019] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 4 This is a schematic diagram of the explosive assembly of the shear tube and embedded tube in this application;

[0021] Figure 5 Schematic diagram of the cross-sectional structure of the embedded tube in this application;

[0022] Figure 6 Schematic diagram of the cross-sectional structure of the shear tube in this application;

[0023] Figure 7 This is a schematic diagram of the assembly of the shock-absorbing block in this application;

[0024] Figure 8 This is a force diagram of the existing pipe pile foundation;

[0025] Figure 9 This is a force diagram of the shear tube in this application;

[0026] Figure 10 This is a schematic diagram of the assembly of the traction rope in this application;

[0027] Figure 11 This is a schematic diagram of the force on the traction rope in this application.

[0028] Description of the numbers in the figure:

[0029] 1. Foundation body; 101. Cap; 102. Pile body; 2. Tower body; 201. Mounting flange; 202. Rectangular groove; 3. Embedded cylinder; 301. Nested cavity; 302. Plug-in cavity; 303. Accommodating cavity; 4. Semi-buried flange; 5. Welding bolt; 6. Locking nut; 7. Shear cylinder; 701. Upper plug-in cylinder; 702. Nested cylinder; 703. Lower plug-in cylinder; 8. Shock-absorbing ring; 9. Oblique anchor rod; 10. Connecting rod; 11. Sliding plate; 12. Embedded plate; 13. Shock-absorbing block; 14. Buffer cylinder; 15. Piston plate; 1501. Flow hole; 16. Traction rope. DETAILED DESCRIPTION

[0030] The following describes two implementation methods of the present application in detail with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] Figure 1-9 A communication tower pipe pile foundation is shown, comprising a base body 1 for mounting a tower body 2, with an embedded cylinder 3 pre-buried within the base body 1, and a shear cylinder 7 nested within the embedded cylinder 3, extending into the interior of the tower body 2 and abutting the inner wall of the tower body 2; a semi-buried flange 4 extending above the base body 1 is fixedly connected to the upper portion of the embedded cylinder 3, and weld bolts 5 are welded to the upper end face of the semi-buried flange 4 at equidistant intervals around the circumference; a mounting flange 201 is provided at the lower portion of the tower body 2, disposed opposite the semi-buried flange 4, and the weld bolts 5 extend through the mounting flange 201 and are threadedly connected to lock nuts 6;

[0033] A shock-absorbing ring 8 is sleeved on the middle part of the shear tube 7 and abuts against the inner wall of the embedded tube 3. The lower part of the basic body 1 is nested with inclined anchor rods 9 distributed equidistantly around the circumference. The inclined anchor rods 9 extend into the embedded tube 3 and are hinged with a connecting rod 10. The upper end of the connecting rod 10 is hinged with a sliding plate 11 that is slidably connected to the inner wall of the embedded tube 3. The sliding plate 11 abuts against the lower end of the shear tube 7.

[0034] Specifically, when installing the basic body 1, the following steps are included:

[0035] Step 1: dig an installation pit on the ground, place the shell of the basic body 1 into the installation pit and level it, then put in the oblique anchor rod 9 and the sliding plate 11;

[0036] Step 2: Place the shear tube 7 into the inner cavity of the embedded tube 3;

[0037] Step 3: Hoist the tower body 2 so that the mounting flange 201 below the tower body is opposite to the semi-buried flange 4 on the upper part of the embedded tube 3. Then, release the tower body 2 vertically. Use the weight of the tower body 2 to press the shear tube 7 downward. The shear tube 7 presses the sliding plate 11 inside the embedded tube 3. The sliding plate 11 pushes the oblique anchor rod 9 into the surrounding soil through the connecting rod 10.

[0038] Step 4: Ram the mounting flange 201 until it is completely in contact with the semi-buried flange 4 , and then install the locking bolts 6 to complete the installation.

[0039] Compared with the traditional communication pile foundation, please refer to Figure 8 and Figure 9 The present invention is provided with an embedded tube 3 embedded in the basic body 1 and a shear tube 7 nested in the embedded tube 3 and extending into the tower body 2. When the tower body 2 swings, the shear tube 7 is used to transfer the horizontal shear force exerted on the tower body 2 to the embedded tube 3. The tower body 2 and the embedded tube 3 have a large axial contact area with the shear tube 7, so as to reduce the horizontal shear force exerted on the welded bolts 5, and overcome the problem of excessive stress concentration on the embedded bolts; at the same time, by providing the inclined anchor rod 9 at the lower part of the basic body 1, the grip of the basic body 1 when subjected to the inertia of swinging is enhanced, the stability of the basic body 1 is improved, and the horizontal shear force has a better offsetting effect; in addition, by providing the shock-absorbing ring 8 between the shear tube 7 and the embedded tube 3, the vibration transmitted to the shear tube 7 by the tower body 2 is absorbed, the vibration of the embedded tube 3 is reduced, and then the vibration of the welded bolts 5 installed on the upper part of the embedded tube 3 is reduced, thereby improving the stability of the connection between the tower body 2 and the basic body 1.

[0040] See also Figure 3 and Figure 7 The welding bolt 5 is fixedly connected to the semi-buried flange 4 by welding. A rectangular groove 202 opposite to the welding bolt 5 is provided on the mounting flange 201. A shock-absorbing block 13 is nested in the rectangular groove 202. A center hole for the welding bolt 5 to pass through is provided in the middle of the shock-absorbing block 13. The rectangular groove 202 is covered with a mounting plate abutting against the locking nut 6. The vertical projection area of the mounting plate is larger than the vertical projection area of the rectangular groove 202.

[0041] Specifically, during installation, the welding bolt 5 is connected to the mounting flange 201 through the shock-absorbing block 13, that is, the welding bolt 5 and the mounting flange 201 are in elastic contact. When the tower body 2 swings, the shock-absorbing block 13 is squeezed to prevent the mounting flange 201 and the welding bolt 5 from being rigidly squeezed, thereby protecting the welding bolt 5. At the same time, the welding bolt 5 and the locking nut 6 cooperate to prevent the mounting flange 201 from vertically moving and detaching.

[0042] See also Figure 4-6 The embedded tube 3 is a vertically arranged stepped cylindrical structure, the semi-buried flange 4 is an annular flange integrally formed with the embedded tube 3, and a nesting cavity 301 communicating with the semi-buried flange 4 is opened at the upper part of the embedded tube 3. The lower part of the nesting cavity 301 is connected to a plug-in cavity 302 with a different radius. The shock-absorbing ring 8 is nested in the nesting cavity 301, and the vertical height of the shock-absorbing ring 8 is lower than the vertical height of the nesting cavity 301.

[0043] Specifically, the installation and protection of the shock-absorbing ring 8 is achieved, so as to absorb the vibration of the shear-resistant tube 7 and reduce the vibration of the tower body 2 .

[0044] See also Figure 4-6 The shear tube 7 is a stepped frustum tube structure, the upper part of which is an upper plug-in tube 701 nested in the tower body 2, the middle part is a nested tube 702 nested in the shock-absorbing ring 8, and the lower part is a lower plug-in tube 703 plugged in the plug-in cavity 302 and abutting against the inner wall of the plug-in cavity 302. The diameters of the upper plug-in tube 701, the nested tube 702 and the lower plug-in tube 703 are not equal.

[0045] Specifically, the abutting positions of the shear tube 7 and the embedded tube 3 are staggered, which has a better transmission effect on the horizontal shear force.

[0046] See also Figure 2-4 The foundation body 1 includes a pedestal 101 wrapped around the outside of the embedded tube 3 and cast in one piece with concrete, and a pile body 102 below it. The pedestal 101 is a stepped truncated cone-shaped structure, and the pile body 102 is a vertical cylindrical structure. The embedded tube 3 is located inside the pedestal 101 and is fixedly connected to the embedded plate 12.

[0047] Specifically, the embedded plate 12 makes the foundation body 1 more integrated, increases the contact area between the embedded tube 3 and the concrete layer, reduces the separation between the embedded tube 3 and the concrete layer caused by vibration, and facilitates the overall lifting and supporting of the tower body 2.

[0048] See also Figure 2-5 The inclined anchor rod 9 is a strip rod with a pointed outer end. Both the pile body 102 and the embedded tube 3 have through holes for the inclined anchor rod 9 to pass through. The sliding disk 11 is a disc-shaped structure and is nested in the insertion cavity 302.

[0049] Specifically, the oblique anchor rods 9 are inserted by utilizing the deadweight of the tower body 2 , which reduces the difficulty of installing the oblique anchor rods 9 and improves the overall stability of the foundation body 1 .

[0050] Second implementation method:

[0051] Figure 3 、 Figure 5 and Figure 10-11 A communication tower pipe pile foundation is shown. On the basis of the first embodiment, a buffer cylinder 14 is installed at the lower part of the embedded cylinder 3, and a piston disk 15 is nested in the buffer cylinder 14 and vertically slidably connected to it. The surface of the piston disk 15 is provided with evenly distributed flow holes 1501. The upper end of the piston disk 15 is fixedly connected to a traction rope 16, which extends into the tower body 2 and is fixedly connected to the inner wall of the tower top of the tower body 2. The buffer cylinder 14 is filled with hydraulic oil.

[0052] For details, please refer to Figure 11 When the top of the tower body 2 swings with the wind, the top of the tower drives the piston disk 15 in the buffer cylinder 14 to move through the traction rope 16, and the hydraulic oil flows through the through hole of the piston disk 15 to achieve deceleration and buffering of the piston disk 15, thereby reducing the vibration and swing of the top of the tower.

[0053] See also Figure 3 and Figure 5 The shear tube 7 is provided with a through hole for the traction rope 16 to pass through, the inner diameter of the through hole is larger than the diameter of the traction rope 16, and the lower part of the embedded tube 3 is provided with an accommodating cavity 303 for accommodating the buffer tube 14.

[0054] Specifically, the lower portion of the traction rope 16 is guided through the through-hole of the shear tube 7 .

[0055] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A communication tower pipe pile foundation, characterized in that: The invention comprises a basic body (1) for installing a tower body (2), wherein an embedded cylinder (3) is pre-buried in the basic body (1), and a shear-resistant cylinder (7) is nested in the embedded cylinder (3) and extends to the inside of the tower body (2) and abuts against the inner wall of the tower body (2); the upper part of the embedded cylinder (3) is fixedly connected to a semi-buried flange (4) extending to the top of the basic body (1), and the upper end surface of the semi-buried flange (4) is welded with welding bolts (5) distributed at equal distances around the circumference; the lower part of the tower body (2) is provided with a mounting flange (201) arranged opposite to the semi-buried flange (4), and the welding bolts (5) pass through the mounting flange (201) and are threadedly connected with locking nuts (6); The middle part of the shear-resistant tube (7) is sleeved with a shock-absorbing ring (8) that abuts against the inner wall of the embedded tube (3); the lower part of the base body (1) is embedded with inclined anchor rods (9) distributed equidistantly around the circumference; the inclined anchor rods (9) extend into the embedded tube (3) and are hinged with connecting rods (10); the upper end of the connecting rod (10) is hinged with a sliding disk (11) that is slidably connected to the inner wall of the embedded tube (3); the sliding disk (11) abuts against the lower end of the shear-resistant tube (7); A buffer cylinder (14) is installed at the lower part of the embedded cylinder (3), and a piston disc (15) is nested in the buffer cylinder (14) and is vertically slidably connected thereto. The surface of the piston disc (15) is provided with evenly distributed flow holes (1501). The upper end of the piston disc (15) is fixedly connected to a traction rope (16), which extends into the tower body (2) and is fixedly connected to the inner wall of the tower top of the tower body (2). The buffer cylinder (14) is filled with hydraulic oil. The embedded tube (3) is a vertically arranged stepped cylindrical structure, the semi-buried flange (4) is an annular flange integrally formed with the embedded tube (3), a nesting cavity (301) communicating with the semi-buried flange (4) is provided on the upper portion of the embedded tube (3), a plug-in cavity (302) having a different radius from the nesting cavity (301) is communicated with below the nesting cavity (301), a shock-absorbing ring (8) is nested in the nesting cavity (301), and the vertical height of the shock-absorbing ring (8) is lower than the vertical height of the nesting cavity (301); The shear-resistant tube (7) is a stepped truncated cone tube structure, wherein the upper portion is an upper plug-in tube (701) nested in the tower body (2), the middle portion is a nested tube (702) nested in the shock-absorbing ring (8), and the lower portion is a lower plug-in tube (703) plugged into the plug-in cavity (302) and abutting against the inner wall of the plug-in cavity (302), and the diameters of the upper plug-in tube (701), the nested tube (702) and the lower plug-in tube (703) are all unequal.

2. A communication tower pipe pile foundation according to claim 1, characterized in that: The welding bolt (5) is fixedly connected to the semi-buried flange (4) by welding. A rectangular groove (202) is provided on the mounting flange (201) and is arranged opposite to the welding bolt (5). A shock-absorbing block (13) is nested in the rectangular groove (202). A central hole for the welding bolt (5) to pass through is provided in the middle of the shock-absorbing block (13). The rectangular groove (202) is covered with a mounting plate that abuts against the locking nut (6). The vertical projection area of the mounting plate is larger than the vertical projection area of the rectangular groove (202).

3. A communication tower pipe pile foundation according to claim 1, characterized in that: The foundation body (1) comprises a cap (101) wrapped around the outside of the embedded tube (3) and integrally cast with concrete, and a pile body (102) below the cap (101). The cap (101) is a stepped, truncated cone-shaped structure, and the pile body (102) is a vertical cylindrical structure. The embedded tube (3) is located inside the cap (101) and is fixedly connected to the embedded plate (12).

4. A communication tower pipe pile foundation according to claim 1, characterized in that: The inclined anchor rod (9) is a strip-shaped rod with a pointed outer end. Both the pile body (102) and the embedded cylinder (3) are provided with through holes for the inclined anchor rod (9) to pass through. The sliding disk (11) is a disk-shaped structure and is nested in the insertion cavity (302).

5. A communication tower pipe pile foundation according to claim 1, characterized in that: The shear-resistant cylinder (7) is provided with a through hole for the traction rope (16) to pass through, and the inner diameter of the through hole is larger than the diameter of the traction rope (16). The lower part of the embedded cylinder (3) is provided with an accommodating cavity (303) for accommodating the buffer cylinder (14).

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