Pre-stressed anchor rod for inclined anchor short pile foundation and construction method of pre-stressed anchor rod

Abstract

The invention relates to an anchoring structural member, and discloses a pre-stressed anchor rod for an inclined anchor short pile foundation, the pre-stressed anchor rod comprises a pile foundation anchoring section, a connecting section and a rock-soil body anchoring section which are sequentially connected from top to bottom, and the bonding and anti-sliding effects of the anchoring rod and a rock-soil body are improved through a plurality of reinforcing pieces arranged on the anchoring rod in a sleeving manner at intervals; the connecting section is detachably connected with the pile foundation anchoring section and the rock-soil body anchoring section, so that the pre-stressed anchor rod can be packaged and transported in a multi-length segmented mode, and then the construction efficiency is improved; the bonding effect of the pile foundation anchoring section and concrete can be enhanced through at least three anchor bars which are obliquely and dispersedly arranged in the pile foundation anchoring section; the invention further discloses a construction method for the pre-stressed anchor rod, the pile foundation is connected with the rock-soil body through the connection of the at least three dispersed and obliquely arranged pre-stressed anchor rods, the pile foundation and the rock-soil body, and therefore construction of the oblique anchor short pile foundation is achieved.

Description

Technical Field

[0001] The present invention relates to an anchoring structural member, and particularly to a prestressed anchor rod for an inclined-anchored short-pile foundation and a construction method thereof. Background Art

[0002] In recent years, with the continuous advancement of the construction of transmission line projects in China, more and more transmission lines inevitably pass through some areas with difficult traffic. In the local transmission line construction, the foundation construction accounts for about 50% of the entire construction period. The main object of foundation construction is the transmission line tower, which is a structure that supports the conductors and lightning conductors of high-voltage transmission lines. It is also an indispensable part of long-distance transmission lines.

[0003] Due to the high height of the transmission line tower, it is prone to shaking or tilting under the action of wind force and conductor tension. The pile foundation can transfer the gravity of the tower and the external forces acting on it to the ground to provide stronger stability and anti-overturning ability, thereby ensuring the reliability and stability of the transmission line tower during the operation of the transmission line.

[0004] To improve the bearing capacity of the pile foundation, researchers have adopted various anchoring forms to reinforce the pile foundation, mainly including: hook anchoring, ribbed steel bar anchoring, strip steel bar anchoring, etc. Although these anchoring forms can improve the bearing capacity of the pile foundation to a certain extent, there are still disadvantages such as insufficient bond performance between the reinforced concrete, unstable anchoring performance, inconvenient transportation and installation, and it is difficult to adapt to complex terrain conditions and cannot meet the safety requirements of current transmission lines. Summary of the Invention

[0005] The object of the present invention is to provide a prestressed anchor rod for an inclined-anchored short-pile foundation and a construction method thereof, so as to solve the problems of insufficient bond performance between the reinforced concrete or uplift bearing capacity, unstable anchoring performance, and inconvenient transportation and installation existing in the existing anchoring forms.

[0006] To achieve the above object, the present invention provides a prestressed anchor rod for an inclined-anchored short-pile foundation, which includes a pile foundation anchoring section, a connection section, and a rock and soil body anchoring section connected in sequence from top to bottom;

[0007] The pile foundation anchoring section includes a connecting rod and at least three anchor bars. The bottom ends of the at least three anchor bars are connected to the top end of the connecting rod. The at least three anchor bars are circumferentially spaced around the connecting rod. The at least three anchor bars are inclined with respect to the axial direction of the connecting rod. The radial distance between the at least three anchor bars and the connecting rod gradually increases from the connection position of the anchor bar and the connecting rod to the other end of the anchor bar;

[0008] The rock and soil anchorage section includes an anchor rod and a plurality of reinforcing plates; the outer diameter of the reinforcing plate is greater than the outer diameter of the anchor rod, a through hole is formed in the middle of the reinforcing plate, and the plurality of reinforcing plates are evenly sleeved on the outer periphery of the anchor rod at intervals along the axial direction of the anchor rod;

[0009] The connecting section includes a steel cable body, the bottom end of the connecting rod is detachably connected to the top end of the steel cable body, and the top end of the anchor rod is detachably connected to the bottom end of the steel cable body.

[0010] Further, the pile foundation anchorage section further includes stirrups, the stirrups are spirally wound around the outer peripheries of at least three of the anchor bars, and the pitch of the stirrups gradually increases from top to bottom.

[0011] Further, the rock and soil anchorage section further includes a grout stopping assembly, the grout stopping assembly is arranged at the top of the anchor rod and is located above the plurality of reinforcing plates;

[0012] The grout stopping assembly includes a nut, a gasket and a grout stopper sleeved on the anchor rod in sequence from top to bottom, and the bottom end face diameter of the grout stopper is greater than the outer diameter of the reinforcing plate.

[0013] Further, the connecting section further includes a first connecting sleeve and a second connecting sleeve;

[0014] The first connecting sleeve is fixedly arranged at the top end of the steel cable body, and the second connecting sleeve is fixedly arranged at the bottom end of the steel cable body;

[0015] The top end of the first connecting sleeve is provided with a first opening, the bottom end of the connecting rod is provided with an external thread, the first connecting sleeve is sleeved on the outer periphery of the bottom end of the connecting rod and is screwed with the connecting rod;

[0016] The bottom end of the second connecting sleeve is provided with a second opening, the top end of the anchor rod is provided with an external thread, the second connecting sleeve is sleeved on the outer periphery of the top end of the anchor rod and is screwed with the anchor rod.

[0017] Further, the cross section of the reinforcing plate is in a cross shape.

[0018] Further, define the included angle between each of the anchor bars and the axis of the connecting rod as i, and the value of i is 30° to 45°.

[0019] Further, the steel cable body includes a plurality of steel cables arranged in parallel.

[0020] The present invention also discloses a construction method for the above-mentioned prestressed anchor rod, which includes the following steps:

[0021] S1. Excavate a foundation pit at the installation position of the foundation, and erect a pile foundation formwork in the foundation pit;

[0022] S2. Uniformly open a plurality of first guiding holes for the connecting rods to pass through along the circumferential direction of the pile foundation formwork, and make the first guiding holes inclined to the axis of the pile foundation;

[0023] Fix and install a plurality of pile foundation anchoring sections equal in number to the first guiding holes into the pile foundation formwork, and pass the connecting rods of each pile foundation anchoring section out through the corresponding first guiding holes;

[0024] S3. Pour concrete into the pile foundation formwork;

[0025] S4. Excavate a plurality of second guiding holes equal in number to the first guiding holes around the pile foundation, and make the diameter of the second guiding holes larger than the diameter of the reinforcing plates;

[0026] S5. Install the rock and soil anchoring section into the second guiding hole;

[0027] S6. Pour concrete into the second guiding hole;

[0028] S7. Hoist and place the pile foundation into the pile foundation formwork;

[0029] S8. Connect the two ends of the connecting section to the connecting rod and the anchoring rod respectively;

[0030] S9. Pour concrete into the gap around the connecting section and the pile foundation, and make the connecting section covered by the concrete;

[0031] S10. Backfill the rock and soil in the pile foundation foundation pit to complete the construction.

[0032] Further, before step S5, there is also step S4-1: Ventilate the second guiding hole and blow out the sundries in the second guiding hole.

[0033] Compared with the prior art, the prestressed anchor rod for the inclined anchor short pile foundation and its construction method provided by the present invention have the following beneficial effects:

[0034] A prestressed anchor rod for an inclined anchor short pile foundation provided by the present invention includes a pile foundation anchorage section, a connection section, and a rock and soil body anchorage section connected in sequence from top to bottom; the pile foundation anchorage section includes a connecting rod and at least three anchor bars, the anchor bars are inclined with respect to the axial direction of the connecting rod, and at least three anchor bars are circumferentially spaced around the connecting rod to increase the contact area between the pile foundation anchorage section and the concrete in the pile foundation, thereby improving the bonding performance between the pile foundation anchorage section and the concrete, effectively enhancing the anchoring effect and stability of the pile foundation anchorage section; through a plurality of reinforcing sheets uniformly sleeved on the outer periphery of the anchoring rod at intervals along the axial direction of the anchoring rod, the bonding effect between the anchoring rod and the rock and soil body is enhanced, thereby improving the anchoring effect of the rock and soil body anchorage section, and together with the anchoring effect of the pile foundation anchorage section, the overall anchoring effect of the prestressed anchor rod is improved; and the steel cable body connecting the pile foundation anchorage section and the rock and soil body anchorage section has a certain flexibility compared with the metal rod body, which is convenient for adapting to the minor settlement and movement of the foundation or the rock and soil body, so that it can be applied to different terrain conditions. In addition, through the detachable connection of the connection section with the pile foundation anchorage section and the rock and soil body anchorage section respectively, the prestressed anchor rod can be packaged and transported separately, and then assembled at the construction site, thus facilitating transportation and improving construction efficiency.

[0035] The present invention also provides a construction method for the above prestressed anchor rod. Through the connection between the pile foundation anchorage section and the pile foundation formwork, the bonding connection between the rock and soil body anchorage section and the rock and soil body, and the connection of both ends of the connection section with the pile foundation anchorage section and the rock and soil body anchorage section respectively, and finally installing the pile foundation into the pile foundation formwork, the construction process of the prestressed anchor rod for the inclined anchor short pile foundation is completed, thereby realizing the construction of the inclined anchor short pile foundation, so as to facilitate the construction of the next transmission line foundation project on the inclined anchor short pile foundation. Description of the Drawings

[0036] Figure 1 It is a schematic structural diagram of a prestressed anchor rod according to an embodiment of the present invention;

[0037] Figure 2 It is a top view schematic diagram of a prestressed anchor rod according to an embodiment of the present invention;

[0038] Figure 3 It is a bottom view schematic diagram of a prestressed anchor rod according to an embodiment of the present invention.

[0039] In the figure, 100 is a prestressed anchor rod; 1 is the anchorage section of the pile foundation; 11 is a connecting rod; 12 is an anchor bar; 13 is a stirrup; 14 is a backing plate; 15 is a protective cap; 2 is the anchorage section in the rock and soil mass; 21 is an anchoring rod; 22 is a reinforcing plate; 23 is a grout-stop assembly; 231 is a nut; 232 is a gasket; 233 is a grout stopper; 3 is a connecting section; 31 is a steel cable body; 311 is a steel cable; 32 is a first connecting sleeve; 33 is a second connecting sleeve. Detailed implementation manners

[0040] The following combines the accompanying drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0041] As Figures 1 to 3 shown, a prestressed anchor rod 100 for an inclined-anchored short pile foundation according to an embodiment of the present invention includes an anchorage section 1 of the pile foundation, a connecting section 3, and an anchorage section 2 in the rock and soil mass that are connected in sequence from top to bottom; the anchorage section 1 of the pile foundation includes a connecting rod 11 and at least three anchor bars 12, the bottom ends of the anchor bars 12 are connected to the top end of the connecting rod 11, at least three anchor bars 12 are circumferentially spaced around the connecting rod 11, the anchor bars 12 are inclined with respect to the axial direction of the connecting rod 11, and the radial distance between the anchor bars 12 and the connecting rod 11 gradually increases from the connection position of the anchor bars 12 and the connecting rod 11 to the other end of the anchor bars 12; the anchorage section 2 in the rock and soil mass includes an anchoring rod 21 and a plurality of reinforcing plates 22; the outer diameter of the outer circumference of the reinforcing plates 22 is greater than the outer diameter of the anchoring rod 21, a through hole is provided in the middle of the reinforcing plates 22, and a plurality of the reinforcing plates 22 are evenly sleeved on the outer circumference of the anchoring rod 21 at intervals along the axial direction of the anchoring rod 21; the connecting section 3 includes a steel cable body 31, the bottom end of the connecting rod 11 is detachably connected to the top end of the steel cable body 31, and the top end of the anchoring rod 21 is detachably connected to the bottom end of the steel cable body 31.

[0042] Based on the above technical solution, the anchor bars 12 are inclined with respect to the axis direction of the connecting rod 11, and at least three anchor bars 12 are circumferentially spaced around the connecting rod 11 to increase the contact area between the anchorage section 1 of the pile foundation and the concrete in the pile foundation, thereby improving the bonding performance between the anchorage section 1 of the pile foundation and the concrete, and effectively enhancing the anchorage effect and stability of the anchorage section 1 of the pile foundation; through a plurality of reinforcing sheets 22 uniformly sleeved on the outer periphery of the anchorage rod 21 at intervals along the axial direction of the anchorage rod 21, the bonding effect between the anchorage rod 21 and the rock and soil mass is enhanced, thereby improving the anchorage effect of the rock and soil mass anchorage section 2, and together with the anchorage effect of the pile foundation anchorage section 1, the overall anchorage effect of the prestressed anchor 100 is improved; and the steel cable body 31 connecting the pile foundation anchorage section 1 and the rock and soil mass anchorage section 2 has a certain flexibility compared with the metal rod body, which is convenient for adapting to the small settlement and movement of the foundation or the rock and soil mass, so that it can be applied to different terrain conditions. In addition, through the detachable connection of the connecting section 3 with the pile foundation anchorage section 1 and the rock and soil mass anchorage section 2 respectively, the prestressed anchor 100 can be packaged and transported separately and assembled on the construction site, thus facilitating transportation and improving construction efficiency.

[0043] Preferably, as Figure 1 shown, the pile foundation anchorage section 1 further includes a backing plate 14 and a protective cap 15. The protective cap 15 is connected to the bottom end of the anchor bar 12 to protect the cut end of the anchor bar 12, and the protective cap 15 is connected to the connecting rod 11 through the backing plate 14, thereby realizing the connection between the bottom end of the anchor bar 12 and the connecting rod 11.

[0044] Further, as Figure 1 shown, since the radial distance between the anchor bar 12 and the connecting rod 11 gradually increases from the connection position of the anchor bar 12 and the connecting rod 11 to the other end of the anchor bar 12, there is a certain radial distance between the top end of the anchor bar 12 and the connecting rod 11. To ensure that the anchor bar 12 is not damaged such as broken during use, the pile foundation anchorage section 1 further includes a stirrup 13. The stirrup 13 is spirally wound around the outer periphery of at least three anchor bars 12; the pitch of the stirrup 13 gradually increases from top to bottom, so that the pitch of the stirrup 13 changes with the radial distance between the anchor bar 12 and the connecting rod 11. The greater the radial distance between the anchor bar 12 and the connecting rod 11, the smaller the pitch of the stirrup 13, that is, the stirrup 13 is wound more densely to provide a better protection effect.

[0045] Preferably, as Figures 1 to 3As shown, the stirrup 13 and the anchor bar 12 are connected by welding, thereby connecting the stirrup 13 and the anchor bar 12 as a whole, facilitating the uniform transmission of the force to each anchor bar 12, enhancing the bending and shear resistance of each anchor bar 12, thereby preventing it from bending, and ensuring the service life of the prestressed anchor 100.

[0046] Furthermore, as Figure 1 shown, since the anchor rod 21 in the anchorage section 2 of the rock and soil body is inserted into the rock and soil body during use, and the anchor rod 21 is bonded to the rock and soil body through grouting; the anchorage section 2 of the rock and soil body further includes a grout stop assembly 23, the grout stop assembly 23 is provided at the top of the anchor rod 21 and is located above a plurality of the reinforcing fins 22; the grout stop assembly 23 includes a nut 231, a gasket 232 and a grout stop plug 233 sleeved on the anchor rod in sequence from top to bottom, the bottom end face diameter of the grout stop plug 233 is larger than the outer diameter of the reinforcing fin 22, through the grout stop plug 233, it is possible to prevent the grouting material from flowing back to the outside of the hole along the drill hole during grouting; and through the gasket 232, an additional sealing effect is provided to further prevent the grouting material from flowing back, and the nut 231 is used to adjust the position of the grout stop plug 233 to adapt to the depths of different grouting drill holes.

[0047] Furthermore, as Figure 1 shown, to achieve the detachable connection between the steel cable body 31 and the connecting rod 11 and the anchor rod 21, the connecting section 3 further includes a first connecting sleeve 32 and a second connecting sleeve 33; the first connecting sleeve 32 is fixedly provided at the top end of the steel cable body 31, and the second connecting sleeve 33 is fixedly provided at the bottom end of the steel cable body 31; the top end of the first connecting sleeve 32 is provided with a first opening, the bottom end of the connecting rod 11 is provided with an external thread, the first connecting sleeve 32 is sleeved on the outer periphery of the bottom end of the connecting rod 11 and is screwed to the connecting rod 11; the bottom end of the second connecting sleeve 33 is provided with a second opening, the top end of the anchor rod 21 is provided with an external thread, the second connecting sleeve 33 is sleeved on the outer periphery of the top end of the anchor rod 21 and is screwed to the anchor rod 21. Through the screwed connection method, it is possible to control the prestress applied by the connecting section 3 by changing the screwed-in degree of the first connecting sleeve 32 or the second connecting sleeve 33, thereby achieving the purpose of adjusting the prestress.

[0048] Furthermore, as Figure 1 and Figure 2 shown, the cross section of the reinforcing fin 22 is in a cross shape, so that when the anchor rod 21 is inserted into the rock and soil body, the grouting material passes through the cross-shaped edge of the reinforcing fin 22 instead of accumulating on the upper end face of the reinforcing fin 22, which affects the quality of grouting.

[0049] Furthermore, as Figure 2 and Figure 3As shown in the figure, define the included angle between the axis of each anchor bar 12 and the axis of the connecting rod 11 as i, and the value of i is 30° to 45°; the included angle i should not be too large, because if it is too large, the radial distance between the anchor bar 12 and the connecting rod 11 will be large, and it is easy to break at the connection position between the anchor bar 12 and the connecting rod 11; the included angle i should not be too small, because if the included angle is too small, the anchor bars 12 are relatively close, or even fit together, and the purpose of increasing the contact area with the concrete in the pile foundation cannot be achieved by the anchor bars 12.

[0050] Further, as Figure 1 shown in the figure, the steel cable body 31 includes a plurality of parallel steel cables 311, and the steel cable body 31 is composed of a plurality of parallel steel cables 311 together, which is convenient for dispersing the load, so as to enhance the safety and flexibility of the steel cable body 31 and be suitable for different terrain environments.

[0051] The present invention also provides a construction method for the above-mentioned prestressed anchor rod 100, which includes the following steps:

[0052] S1. Excavate a foundation pit at the installation position of the foundation, and set up a pile foundation formwork in the foundation pit;

[0053] S2. Uniformly open a plurality of first guiding holes for the connecting rod 11 to pass through along the circumferential direction of the pile foundation formwork, and make the first guiding holes inclined to the axis of the pile foundation;

[0054] Fix and install a plurality of pile foundation anchoring sections 1 equal in number to the first guiding holes into the pile foundation formwork, and pass the connecting rods 11 of each pile foundation anchoring section 1 out of the corresponding first guiding holes;

[0055] S3. Pour concrete into the pile foundation formwork;

[0056] S4. Excavate a plurality of second guiding holes equal in number to the first guiding holes around the pile foundation, and make the diameter of the second guiding holes larger than the diameter of the reinforcing piece 22;

[0057] S5. Install the rock and soil anchoring section 2 into the second guiding hole;

[0058] S6. Pour concrete into the second guiding hole;

[0059] S7. Lift and place the pile foundation into the pile foundation formwork;

[0060] S8. Connect the two ends of the connecting section 3 to the connecting rod 11 and the anchoring rod 21 respectively;

[0061] S9. Pour concrete into the gap between the connecting section 3 and the pile foundation, and make the connecting section 3 covered by the concrete;

[0062] S10. Backfill the rock and soil in the foundation pit of the pile foundation to complete the construction.

[0063] Based on the above technical solution, through the connection between the pile foundation anchorage section 1 and the pile foundation formwork, the bonding connection between the rock and soil anchorage section 2 and the rock and soil, and connecting the two ends of the connection section 3 to the pile foundation anchorage section 1 and the rock and soil anchorage section 2 respectively, and finally installing the pile foundation into the pile foundation formwork, the construction process of the prestressed anchor rod 100 for the inclined anchor short pile foundation is completed, so as to realize the construction of the inclined anchor short pile foundation, facilitating the next step of the transmission line foundation project construction for the inclined anchor short pile foundation.

[0064] Further, before step S5, there is also step S4-1: ventilate the second guiding hole and blow out the sundries in the second guiding hole, thereby improving the pouring quality in the second guiding hole and ensuring the bonding effect between the anchor rod 21 and the rock and soil.

[0065] In summary, the embodiment of the present invention provides a prestressed anchor rod 100, which includes a pile foundation anchorage section 1, a connection section 3, and a rock and soil anchorage section 2 connected in sequence from top to bottom. The pile foundation anchorage section 1 includes a connecting rod 11 and at least three anchor bars 12. The anchor bars 12 are inclined with respect to the axial direction of the connecting rod 11, and at least three anchor bars 12 are circumferentially spaced around the connecting rod 11 to increase the contact area between the pile foundation anchorage section 1 and the concrete in the pile foundation, thereby improving the bonding performance between the pile foundation anchorage section 1 and the concrete, effectively enhancing the anchoring effect and stability of the pile foundation anchorage section 1. By a plurality of reinforcing sheets 22 evenly sleeved on the outer periphery of the anchor rod 21 at intervals along the axial direction of the anchor rod 21, the bonding effect between the anchor rod 21 and the rock and soil is enhanced, thereby improving the anchoring effect of the rock and soil anchorage section 2, and together with the anchoring effect of the pile foundation anchorage section 1, the overall anchoring effect of the prestressed anchor rod 100 is improved. And the steel cable body 31 connecting the pile foundation anchorage section 1 and the rock and soil anchorage section 2 has a certain flexibility compared with the metal rod body, facilitating adaptation to the minor settlement and movement of the foundation or the rock and soil, and thus can be applicable to different terrain conditions. In addition, through the detachable connection of the connection section 3 to the pile foundation anchorage section 1 and the rock and soil anchorage section 2 respectively, the prestressed anchor rod 100 can be packaged and transported separately, and assembled at the construction site, thus facilitating transportation and improving the construction efficiency.

[0066] The present invention also provides a construction method for the above-mentioned prestressed anchor rod 100. Through the connection between the pile foundation anchorage section 1 and the pile foundation formwork, the bonding connection between the rock and soil anchorage section 2 and the rock and soil, and connecting the two ends of the connection section 3 to the pile foundation anchorage section 1 and the rock and soil anchorage section 2 respectively, and finally installing the pile foundation into the pile foundation formwork, the construction process of the prestressed anchor rod 100 for the inclined anchor short pile foundation is completed, thereby realizing the construction of the inclined anchor short pile foundation, so as to facilitate the next-step construction of the transmission line foundation project for the inclined anchor short pile foundation.

[0067] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A prestressed anchor rod for inclined anchor short pile foundation, characterized in that: It includes a pile foundation anchoring section, a connecting section and a rock and soil anchoring section which are sequentially connected from top to bottom; The pile foundation anchoring section comprises a connecting rod and at least three anchor bars, the bottom end of the anchor bar is connected to the top end of the connecting rod, at least three anchor bars are arranged circumferentially around the connecting rod, the anchor bars are arranged obliquely relative to the axial direction of the connecting rod, and the radial distance between the anchor bar and the connecting rod gradually increases from the connection position of the anchor bar and the connecting rod to the other end of the anchor bar; The rock and soil anchoring section comprises an anchor rod and a plurality of reinforcing plates; the outer diameter of the reinforcing plates is larger than the outer diameter of the anchor rod, a through hole is provided in the middle of the reinforcing plates, and the plurality of reinforcing plates are evenly sleeved on the outer periphery of the anchor rod at intervals along the axial direction of the anchor rod; The connecting section comprises a steel cable body, the bottom end of the connecting rod is detachably connected to the top end of the steel cable body, and the top end of the anchoring rod is detachably connected to the bottom end of the steel cable body.

2. The prestressed anchor rod according to claim 1, characterized in that: The pile foundation anchoring section also includes stirrups, which are spirally wrapped around the outer circumference of the at least three anchor bars, and the pitch of the stirrups gradually increases from top to bottom.

3. The prestressed anchor rod according to claim 1, characterized in that: The rock and soil body anchoring section further includes a grout stopping assembly, which is arranged at the top of the anchor rod and above the reinforcement sheet; The grout-stopping assembly comprises a nut, a gasket and a grout-stopping plug which are sequentially sleeved on the anchor rod from top to bottom, and the diameter of the bottom end surface of the grout-stopping plug is larger than the outer circumferential diameter of the reinforcing plate.

4. The prestressed anchor rod according to claim 1, characterized in that: The connecting section also includes a first connecting sleeve and a second connecting sleeve; The first connecting sleeve is fixedly disposed at the top end of the steel cable body, and the second connecting sleeve is fixedly disposed at the bottom end of the steel cable body; The top end of the first connecting sleeve is provided with a first opening, the bottom end of the connecting rod is provided with an external thread, the first connecting sleeve is sleeved on the outer periphery of the bottom end of the connecting rod and is threadedly connected with the connecting rod; The bottom end of the second connecting sleeve is provided with a second opening, the top end of the anchor rod is provided with an external thread, and the second connecting sleeve is sleeved on the outer periphery of the top end of the anchor rod and is threadedly connected with the anchor rod.

5. The prestressed anchor rod according to claim 1, characterized in that: The cross section of the reinforcement sheet is cross-shaped.

6. The prestressed anchor rod according to claim 1, characterized in that: The angle between each anchor bar and the axis of the connecting rod is defined as i, and the value of i is 30° to 45°.

7. The prestressed anchor rod according to claim 1, characterized in that: The steel cable body comprises a plurality of steel cables arranged in parallel.

8. The prestressed anchor rod according to claim 1, characterized in that: The pile foundation anchoring section also includes a pad and a protective cap. The bottom end of the anchor bar is connected to the protective cap, and the protective cap is connected to the connecting rod through the pad.

9. A construction method for a prestressed anchor rod as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Excavate a foundation pit at the location where the foundation is to be installed, and set up a pile foundation template in the foundation pit; S2, evenly opening a plurality of first guide holes for the connection rods to pass through along the circumference of the pile foundation template, and making the first guide holes inclined to the axis of the pile foundation; Fixing a plurality of pile foundation anchoring sections, the number of which is equal to the first guide holes, into the pile foundation template, and passing the connecting rods of each pile foundation anchoring section through the first guide holes corresponding thereto; S3, pouring concrete into the pile foundation formwork; S4, excavating a plurality of second guide holes around the pile foundation, the number of which is equal to the first guide holes, and making the diameter of the second guide holes larger than the diameter of the reinforcement sheet; S5, installing the rock and soil anchoring section into the second guide hole; S6, pouring concrete into the second guide hole; S7, hoisting and placing the pile foundation into the pile foundation template; S8, connecting the two ends of the connecting section to the connecting rod and the anchor rod respectively; S9, pouring concrete in the gap around the connection section and the pile foundation, so that the connection section is covered with concrete; S10. Backfill the rock and soil of the pile foundation pit to complete the construction.

10. The construction method according to claim 9, characterized in that: Before step S5, the method further includes step S4-1: ventilating the second guide hole and blowing out the debris in the second guide hole.

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