Anti-floating anchor rod structure based on sectional grouting

Abstract

The invention relates to the technical field of anchor rods, and particularly discloses an anti-floating anchor rod structure based on sectional grouting, which comprises an anchor seat and a rod body detachably connected with the anchor seat, the sectional grouting units are sequentially spliced to the lower portion of the rod body, each sectional grouting unit comprises a grouting flow channel located in the center, and a plurality of primary grouting cavities and splitting grouting cavities are formed in the periphery of each grouting flow channel in the circumferential direction; and the grouting core pipe is matched with the splitting grouting cavities in the segmented grouting units, and the grouting core pipe sequentially penetrates through the anchor base, the rod body and the grouting flow channels of the segmented grouting units from top to bottom. Primary grouting and secondary splitting grouting are carried out on the sectional type grouting unit, after the primary grouting forms a foundation grouting body, the primary grouting body is split through secondary high-pressure splitting grouting, the cohesive force and the side friction resistance between the anchor rod and the surrounding stratum are further enhanced, and therefore the uplift bearing capacity of the anchor rod is remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of anchor rods, and particularly relates to an anti-floating anchor rod structure based on sectional grouting. BACKGROUND

[0002] The anti-floating anchor rod is an engineering structure for stabilizing a foundation, and by using the anti-floating anchor rod, the weight of a building or a structure can be transmitted to a more stable layer in the ground through the foundation, so that the building or the structure is prevented from floating or shifting under the influence of factors such as soil settlement or water pressure change, and the stability and safety of the building and the structure are ensured.

[0003] The uplift bearing capacity of the anti-floating anchor rod mainly comes from the pre-pressure of the pre-stress transmission structure on the grouting body and the side frictional resistance between the grouting body and the bearing layer; the existing anti-floating anchor rod structure generally adopts integral cast-in-place, and in the anchor cable tensioning stage, the upper part of the grouting body is subjected to the extrusion action of the pre-stress transmission device, and the lower part of the grouting body is subjected to the extrusion action of the extrusion anchor, so that the grouting body as a whole is in a self-balancing state, which leads to the fact that the effective side frictional resistance is not formed between the grouting body and the surrounding bearing layer; when the building foundation is subjected to the buoyancy, the position of the extrusion anchor at the lower end of the grouting body is prone to local concrete crushing damage, thereby leading to the failure of the anti-floating anchor rod structure. SUMMARY

[0004] In order to overcome the above technical problems, the application provides an anti-floating anchor rod structure based on sectional grouting.

[0005] The purpose of the application can be achieved by the following technical scheme:

[0006] The anti-floating anchor rod structure based on sectional grouting comprises an anchor base and a rod body which is detachably connected with the anchor base; and further comprises:

[0007] The sectional grouting units are arranged in a plurality of groups and are sequentially spliced below the rod body, and each sectional grouting unit comprises a grouting flow channel located at the center, and a plurality of primary grouting cavities and splitting grouting cavities are arranged in the periphery of the grouting flow channel in a circumferential direction;

[0008] The grouting core pipe is adapted to the splitting grouting cavities in each sectional grouting unit, and the grouting core pipe sequentially penetrates the anchor base, the rod body and the grouting flow channels of each sectional grouting unit from top to bottom.

[0009] As a further scheme of the application, the primary grouting cavities and the splitting grouting cavities in each sectional grouting unit are staggered, and a group of splitting grouting cavities is arranged between adjacent primary grouting cavities.

[0010] As a further scheme of the application, in each sectional grouting unit, a primary grouting hole is arranged between the grouting flow channel and each primary grouting cavity.

[0011] As a further scheme of the present application: a first split piece is arranged between the grouting flow channel and each split grouting cavity in each sectional grouting unit.

[0012] As a further scheme of the present application: a second split piece is arranged at the joint between each split grouting cavity and the adjacent primary grouting cavity.

[0013] As a further scheme of the present application: the grouting core pipe comprises a pipe body with a closed lower end, and a plurality of annular split pieces are distributed axially on the pipe body, with each annular split piece corresponding to one sectional grouting unit; a plurality of third split pieces are evenly distributed circumferentially on the annular split piece, and the third split pieces are matched with the first split pieces.

[0014] As a further scheme of the present application: an anchor head is further included, the anchor head is connected to the lowermost sectional grouting unit, the upper end of the anchor head is communicated with the grouting flow channel of the corresponding sectional grouting unit, and the lower end of the anchor head is penetrated.

[0015] As a further scheme of the present application: a steel strand unit is further included, the steel strand unit comprises a plurality of groups of main steel strands which are evenly distributed circumferentially in the rod body, and the main steel strands penetrate the anchor base, the rod body, the sectional grouting unit and the anchor head in sequence from top to bottom.

[0016] The steel strand unit further comprises a steel strand disc below the anchor head, the steel strand disc is spliced by a plurality of transverse auxiliary steel strands and longitudinal auxiliary steel strands, and the steel strand disc is fixedly connected with the main steel strands.

[0017] As a further scheme of the present application: a plurality of groups of expansion units are circumferentially distributed on the anchor head, the expansion unit comprises an expansion plate and a first connecting rod which are respectively rotatably installed on the outer wall of the anchor head, a second connecting rod is rotatably connected to the middle part of the expansion plate, the second connecting rod is hinged to the first connecting rod, an extension support rod is also rotatably connected to the anchor head, the hinged part of the second connecting rod and the first connecting rod is rotatably connected to one end of the extension support rod away from the anchor head, and the extension support rod is connected with the anchor head through a communication pipe.

[0018] As a further scheme of the present application: a hole plugging unit is arranged on the periphery of the rod body, the hole plugging unit comprises a plurality of annularly distributed grout filling cavities, an expansion capsule is arranged on the side of the grout filling cavity away from the rod body, and a filling hole is arranged between the grout filling cavity and each split grouting cavity of the uppermost sectional grouting unit.

[0019] The present application has the following beneficial effects:

[0020] The initial grouting and secondary splitting grouting of the sectional grouting unit are carried out, the initial grouting body is formed after the initial grouting, and then the secondary high-pressure splitting grouting is carried out on the initial grouting body to further enhance the bonding force and side friction of the anchor rod and the surrounding stratum, so that the pull-out bearing capacity of the anchor rod is significantly improved;

[0021] The secondary high-pressure splitting grouting splits the initial grouting body by high-pressure grouting slurry, so that the secondary slurry penetrates, diffuses and extrudes the surrounding stratum of the anchoring segment, effectively improves the bonding strength between the grouting body and the stratum, and enhances the overall stability of the anchor rod;

[0022] The design of the sectional grouting unit allows to form multiple layers of corrosion protection, effectively solving the durability problem of the anchor rod, and the design of the pressure dispersion type anchor rod makes the friction stress peak value lower and the load distribution more uniform, so that the stratum strength in the anchoring length range can be effectively utilized, thereby significantly improving the pull-out force of the anchoring segment per unit length. BRIEF DESCRIPTION OF DRAWINGS

[0023] The application will be further described below with reference to the accompanying drawings.

[0024] Figure 1 is a structural schematic view of the application;

[0025] Figure 2 is a sectional view of the application;

[0026] Figure 3 is a structural schematic view of the sectional grouting unit in the application;

[0027] Figure 4 is a top view of the sectional grouting unit in the application;

[0028] Figure 5 is Figure 4 a sectional view in A-A direction in the application;

[0029] Figure 6 is Figure 4 a sectional view in B-B direction in the application;

[0030] Figure 7 is a slurry flow direction schematic view of the initial normal-pressure grouting in the application;

[0031] Figure 8 is a slurry flow direction schematic view of the secondary high-pressure splitting grouting in the application;

[0032] Figure 9 is a slurry flow direction schematic view of the secondary high-pressure splitting grouting in the application from another perspective;

[0033] Figure 10 is a structural schematic view of the grouting core tube in the application;

[0034] Figure 11 is a sectional view of the grouting core tube in the present application;

[0035] Figure 12 is a structural schematic view of the steel strand unit and the expansion unit in the present application;

[0036] Figure 13 is a connection structural schematic view of the anchor head and the expansion unit in the present application;

[0037] Figure 14 is a sectional view of another perspective of the present application;

[0038] Figure 15 is Figure 14 is an enlarged view at C in the middle.

[0039] in the figure:

[0040] 100, anchor base; 200, rod body; 300, anchor head;

[0041] 400, steel strand unit; 410, main steel strand; 420, steel strand disc; 430, transverse auxiliary steel strand; 440, longitudinal auxiliary steel strand;

[0042] 500, sectional grouting unit; 510, grouting flow channel; 520, primary grouting cavity; 530, primary grouting hole; 540, split grouting cavity; 550, first split piece; 560, second split piece;

[0043] 600, grouting core tube; 610, tube body; 620, annular split piece; 630, third split piece;

[0044] 700, hole plugging unit; 710, grout filling cavity; 720, expansion capsule; 730, filling hole;

[0045] 800, expansion unit; 810, expansion plate; 820, first connecting rod; 830, second connecting rod; 840, telescopic support rod; 850, communication pipe. DETAILED DESCRIPTION

[0046] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that discussions of these implementations are merely provided for the purposes of enabling better understanding of the subject matter and can be changed in function and arrangement without departing from the protective scope of the present specification. Each of the examples can omit, substitute, or add various procedures or components according to necessity. In addition, features described with respect to some examples can be combined in other examples.

[0047] Please refer to Figure 1 and Figure 2The application discloses an anti-floating anchor rod structure based on segmented grouting, which comprises an anchor base 100, a rod body 200, segmented grouting units 500 and grouting core pipes 600; the rod body 200 is detachably connected with the anchor base 100;

[0048] Please refer to Figure 3 The segmented grouting units 500 are arranged in groups and are sequentially spliced below the rod body 200, and each group comprises a grouting flow channel 510 arranged at the center, and a plurality of primary grouting cavities 520 and split grouting cavities 540 arranged in the periphery of the grouting flow channel 510 in a circumferential direction;

[0049] Please refer to Figure 14 The grouting core pipes 600 are adapted to the split grouting cavities 540 in each group of the segmented grouting units 500, and the adaptation is selective communication, which will be specifically introduced below by adopting a split piece mode, and the grouting core pipes 600 sequentially penetrate the anchor base 100, the rod body 200 and the grouting flow channels 510 of each group of the segmented grouting units 500 from top to bottom;

[0050] Specifically, after the earthwork excavation of a large surface of a foundation pit is completed, anchor rod hole drilling construction is carried out, then the rod body 200 and each group of the segmented grouting units 500 are placed into the anchor rod hole, an external grouting pipe is inserted into the grouting flow channel 510 through the rod body 200, and the primary grouting cavities 520 of each group of the segmented grouting units 500 are sequentially subjected to primary normal pressure grouting from bottom to top;

[0051] After the primary grouting is completed, the grouting core pipes 600 sequentially penetrate the anchor base 100 and the rod body 200 from top to bottom and are inserted into each group of the grouting flow channels 510, the primary grouting slurry in the grouting flow channels 510 is extruded, and the slurry in the primary grouting cavities 520 is solidified;

[0052] The external grouting pipe is inserted into the grouting core pipe 600, and the split grouting cavities 540 of each group of the segmented grouting units 500 are sequentially subjected to secondary high-pressure split grouting from bottom to top, the primary grouting body is split by the high-pressure grouting slurry, meanwhile, the secondary slurry penetrates, diffuses and extrudes the surrounding stratum of the anchoring section, and the bonding strength between the grouting body and the stratum is improved.

[0053] It is worth noting that the secondary high-pressure split grouting is usually recommended to be carried out 4-6 hours after the primary normal pressure grouting; if the grouting time is set to be 24 hours or even 48 hours later, the anchoring body may have been solidified and has a certain strength, at this time, the high-pressure grouting is difficult to split the primary grouting body, resulting in process failure.

[0054] Further, please refer to Figure 3 The primary grouting cavities 520 and the split grouting cavities 540 in each group of the segmented grouting units 500 are staggered and distributed, and each group of the split grouting cavities 540 is arranged between adjacent primary grouting cavities 520;

[0055] It should be noted that the primary grouting cavities 520 and the split grouting cavities 540 are staggered, which helps to improve the grouting efficiency and the uniformity of the grouting body. The split grouting cavities 540 allow the high-pressure grouting slurry to split the primary grouting body, which helps to form more anchoring points and enhance the anchoring effect of the anchor rod. After the grouting pressure is increased, the slurry diffusion radius is increased, the cohesion of the broken rock stratum is increased, and the overall strength of the surrounding rock is increased, so as to form a stable pressure-bearing combined arch around the anchor rod hole, thereby improving the stability of the anchor rod hole.

[0056] In an embodiment, referring to Figure 4 and Figure 5 , in order to realize the primary grouting of the primary grouting cavities 520, a primary grouting hole 530 is arranged between the grouting flow channel 510 and each primary grouting cavity 520 in each group of sectional grouting units 500;

[0057] Specifically, referring to Figure 7 (the dashed arrow in the figure represents the flow path of the slurry), during the primary grouting process, the external grouting pipe is inserted into the grouting flow channel 510, and the sectional grouting units 500 are sequentially subjected to primary normal-pressure grouting from bottom to top; when a group of sectional grouting units 500 is subjected to primary grouting, the slurry outlet of the grouting pipe is located in the grouting flow channel 510 of the group of sectional grouting units 500, and at the same time, the slurry outlet is located above the corresponding primary grouting hole 530. The slurry in the grouting pipe is injected into the grouting flow channel 510 through the slurry outlet, and then the slurry enters the corresponding primary grouting cavity 520 through the circumferential primary grouting holes 530, so as to realize the primary grouting of each group of primary grouting cavities 520;

[0058] When the primary grouting cavities 520 of the group of sectional grouting units 500 are filled with slurry, the grouting pipe is lifted by one height of the sectional grouting unit 500, so that the slurry outlet is lifted into the grouting flow channel 510 of the adjacent sectional grouting unit 500 above, and the above steps are repeated to perform primary grouting on the group of sectional grouting units 500, until the primary normal-pressure grouting of all sectional grouting units 500 is completed.

[0059] Further, referring to Figure 4 and Figure 6 , in order to realize the secondary high-pressure grouting of the split grouting cavities 540, a first split piece 550 is arranged between the grouting flow channel 510 and each split grouting cavity 540 in each group of sectional grouting units 500;

[0060] Specifically, referring to Figure 8(The dotted arrows in the figure indicate the flow path of the slurry). After the initial normal pressure grouting, the grouting core tube 600 is inserted into the grouting flow channel 510 of each group of segmented grouting units 500, and the slurry in each initial grouting cavity 520 is allowed to solidify to form a primary grouting body. Then, the external grouting tube is inserted into the grouting core tube 600, and secondary high-pressure splitting grouting is performed on each layer of segmented grouting units 500 from bottom to top.

[0061] When a certain group of segmented grouting units 500 is subjected to secondary grouting, the grouting outlet of the grouting pipe is located in the grouting flow channel 510 of the segmented grouting unit 500, and the grouting outlet is located above the corresponding first splitting piece 550. The slurry in the grouting pipe is injected into the grouting core pipe 600 through the grouting outlet, and then the slurry radially penetrates the grouting core pipe 600 and diffuses toward the periphery. The circumferentially arranged first splitting pieces 550 are ruptured under the pressure of the high-pressure slurry, so that the high-pressure slurry enters the corresponding splitting grouting cavity 540, thereby realizing secondary high-pressure splitting grouting of each group of splitting grouting cavities 540. Then, the high-pressure slurry in the splitting grouting cavity 540 diffuses into the primary grouting cavities 520 adjacent to both sides, thereby splitting the primary grouting body in the primary grouting cavity 520.

[0062] When each splitting grouting cavity 540 of the group of segmented grouting units 500 is filled with slurry, the grouting pipe is lifted upward to the height of a segmented grouting unit 500, so that the slurry outlet is lifted to the grouting flow channel 510 of the adjacent segmented grouting unit 500 above, and the above steps are repeated to perform secondary high-pressure grouting on the group of segmented grouting units 500 until the secondary high-pressure splitting grouting of all segmented grouting units 500 is completed.

[0063] For further information, see Figure 3 In order to improve the splitting effect of the primary grouting body, a second splitting piece 560 is provided at the connection between each group of splitting grouting cavity 540 and the adjacent primary grouting cavity 520;

[0064] See also Figure 9 (The dotted arrows in the figure indicate the flow path of the slurry). When the secondary high-pressure slurry enters the corresponding splitting grouting cavity 540 through the rupture of the first splitting piece 550, it will first fill the internal space of the splitting grouting cavity 540. When the high-pressure slurry completely fills the splitting grouting cavity 540, as the external high-pressure slurry continues to flow in, it will squeeze the second splitting pieces 560 on both sides of the splitting grouting cavity 540, so that the second splitting pieces 560 expand toward the adjacent primary grouting cavity 520, thereby utilizing the expanded second splitting piece 560 to squeeze the primary grouting body in the primary grouting cavity 520 radially outward, and then the second splitting piece 560 breaks, and the high-pressure slurry in the splitting grouting cavity 540 enters the primary grouting cavity 520 through the rupture of the second splitting piece 560, and splits the primary grouting body.

[0065] It is worth noting that the second split piece 560 first expands to push the primary grouting body radially outward, and then the second split piece 560 is broken under pressure to make the high-pressure slurry enter the primary grouting cavity 520, thereby achieving uniform splitting of the primary grouting body in the adjacent primary grouting cavity 520;

[0066] In addition, the second split piece 560 plays a role of isolation between the split grouting cavity 540 and the primary grouting cavity 520, which can prevent the primary grouting slurry in the primary grouting cavity 520 from overflowing into the split grouting cavity 540 adjacent thereto during the primary grouting process, thereby ensuring the continuity and stability of the grouting process.

[0067] Correspondingly, referring to Figure 10 and Figure 11 , the grouting core pipe 600 comprises a pipe body 610 with a closed lower end, and a plurality of annular split pieces 620 are distributed axially on the pipe body 610, and each annular split piece 620 corresponds to a segmented grouting unit 500; a plurality of third split pieces 630 are uniformly distributed circumferentially on the annular split piece 620, and the third split piece 630 is matched with the first split piece 550;

[0068] Specifically, the grouting core pipe 600 is inserted into the grouting flow channel 510 of each segmented grouting unit 500, and each annular split piece 620 on the pipe body 610 is aligned with the first split piece 550 in the corresponding grouting flow channel 510. An external grouting pipe is inserted into the inside of the pipe body 610 from the opening at the upper end of the pipe body 610, and high-pressure slurry is injected into the pipe body 610 through the grouting pipe. Under the action of the pressure of the high-pressure slurry, the third split piece 630 on the annular split piece 620 aligned with the first split piece 550 breaks, thereby causing the high-pressure slurry in the pipe body 610 to seep out from the broken third split piece 630. Subsequently, the seeped high-pressure slurry breaks the outer first split piece 550, and the high-pressure slurry enters the corresponding split grouting cavity 540.

[0069] It should be noted that the breaking pressure values of the first split piece 550, the second split piece 560 and the third split piece 630 are all greater than the pressure of normal pressure grouting, that is, the first split piece 550 and the second split piece 560 will not break during the primary normal pressure grouting process, thereby preventing the primary normal pressure slurry from entering the split grouting cavity 540, and ensuring the normal progress of the subsequent secondary high-pressure split grouting process.

[0070] In yet another embodiment, referring to Figure 1 and Figure 12 , the anchor head 300 is connected to the lowermost segmented grouting unit 500, the upper end of the anchor head 300 is in communication with the grouting flow channel 510 of the corresponding segmented grouting unit 500, and the lower end of the anchor head 300 penetrates.

[0071] Specifically, when the initial common grouting is carried out, the grout in the grouting pipe will first flow into the bottom of the anchor rod hole through the internal flow channel of the anchor head 300, thereby filling the space at the bottom of the anchor rod hole below the segmented grouting unit 500, and then the initial grouting is carried out on each layer of the segmented grouting unit 500 in turn, which can effectively prevent the hollowing of the inside of the anchor rod hole and improve the adhesion strength of the anchor rod structure and the surrounding soil layer.

[0072] Further, please refer to Figure 1 and Figure 12 Further, the steel strand unit 400 comprises a plurality of groups of main steel strands 410 which are uniformly distributed in the rod body 200 in the circumferential direction, and the main steel strands 410 pass through the anchor base 100, the rod body 200, the segmented grouting unit 500 and the anchor head 300 in turn from top to bottom.

[0073] The anchor base 100, the rod body 200, each group of segmented grouting units 500 and the anchor head 300 are connected together by the main steel strands 410, thereby improving the overall strength and pullout resistance of the entire anchor rod structure.

[0074] Please refer to Figure 12 The steel strand unit 400 further comprises a steel strand disc 420 located below the anchor head 300, the steel strand disc 420 is spliced by a plurality of transverse auxiliary steel strands 430 and longitudinal auxiliary steel strands 440, and the steel strand disc 420 is fixedly connected with each main steel strand 410.

[0075] When the initial grouting is carried out, the grout entering the bottom of the anchor rod hole from the anchor head 300 wraps and fills the main steel strands 410 and the steel strand disc 420.

[0076] It should be noted that the arrangement of the steel strand disc 420 enables the grout to effectively wrap and fill the main steel strands 410 and the steel strand disc 420 during the initial grouting, thereby enhancing the anchoring effect; the steel strand disc 420 is located below the anchor head 300, and the design of its structure helps to uniformly distribute the force to the anchor head 300, thereby improving the integrity and stability of the entire anchor rod structure; the splicing of the steel strand disc 420 by the transverse auxiliary steel strands 430 and the longitudinal auxiliary steel strands 440 can optimize the stress distribution, reduce local stress concentration and improve the durability of the structure; the fixed connection of the steel strand disc 420 with the main steel strands 410 and the use of the external filling grout can improve the bonding performance between the steel strand unit 400 and the concrete and ensure the effective transmission of the prestress.

[0077] Further, please refer to Figure 12 and Figure 13Further comprising a plurality of sets of expansion units 800 circumferentially distributed on the anchor head 300, the expansion unit 800 comprising an expansion plate 810 and a first connecting rod 820 respectively rotatably mounted on the outer wall of the anchor head 300, the expansion plate 810 having a second connecting rod 830 rotatably connected at the middle portion, the second connecting rod 830 being hinged with the first connecting rod 820, the anchor head 300 further rotatably connected with a telescopic support rod 840, the hinged portion of the second connecting rod 830 and the first connecting rod 820 being rotatably connected with one end of the telescopic support rod 840 away from the anchor head 300; the telescopic support rod 840 being connected with the inside of the anchor head 300 with a communication pipe 850;

[0078] Specifically, in the initial state, the telescopic support rod 840 is in the collapsed state, at this time the first connecting rod 820 and the second connecting rod 830 are in the folded state, and the expansion plate 810 is attached to the outer wall of the anchor head 300;

[0079] When the anchor head 300 is initially grouted, the grout in the anchor head 300 enters each telescopic support rod 840 through the communication pipe 850, thereby causing each telescopic support rod 840 to be pushed outwards, the first connecting rod 820 and the second connecting rod 830 are pushed upwards, and the expansion plate 810 is expanded radially outward, thereby greatly improving the ultimate uplift capacity of the anchor rod by using the supporting resistance of the peripheral soil mass on the expansion plate 810;

[0080] It is worth noting that in this embodiment, the grout of the initial grouting is used to drive the expansion plate 810 to expand radially, thereby triggering the automatic expansion action of the expansion unit 800, and after the grout in the telescopic support rod 840 solidifies, the stability and expansion strength of the expansion plate 810 can be ensured.

[0081] Further, please refer to Figure 14 and Figure 15 Further comprising a plugging unit 700 located on the periphery of the rod body 200, the plugging unit 700 comprising a plurality of grout filling cavities 710 arranged in a ring shape, the grout filling cavities 710 being provided with an expansion capsule 720 away from the rod body 200, and the grout filling cavities 710 and each split grouting cavity 540 of the uppermost layer of the segmented grouting unit 500 being provided with a filling hole 730;

[0082] Specifically, in the process of secondary high-pressure split grouting, when the uppermost layer of the segmented grouting unit 500 is high-pressure grouted, the grout in the split grouting cavity 540 can enter the grout filling cavity 710 through the corresponding filling hole 730, and as the grout in the grout filling cavity 710 increases, the expansion capsule 720 expands radially outward, thereby plugging the upper end opening of the anchor rod hole and effectively isolating the anchoring section and the non-anchoring section.

[0083] It is worth noting that the hole plugging unit 700 divides the anchor rod structure into an anchoring section and a non-anchoring section, ensuring that the cement grout consolidation body of the non-anchoring section and the anchoring section of the anchor rod can be disconnected when prestress is applied, preventing force transmission from the anchoring section of the anchor rod to the cement grout consolidation body of the non-anchoring section and affecting the uplift bearing capacity of the anchor rod structure.

[0084] In addition, in this embodiment, the slurry of the secondary high-pressure grouting is used to drive the radial expansion of the expansion capsule 720 in the hole plugging unit 700, without the need for external structural intervention, thereby automatically triggering the hole plugging function.

[0085] The specific embodiments of the present embodiment are described above, but the present embodiment is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative and not limiting, and those of ordinary skill in the art can make many forms under the inspiration of the present embodiment, which all belong to the protection of the present embodiment.

Claims

1. An anti-floating anchor rod structure based on segmented grouting, comprising an anchor seat (100) and a rod body (200) detachably connected to the anchor seat (100); characterized in that: Also includes: A segmented grouting unit (500) is provided in a plurality of groups and is sequentially spliced ​​below the rod body (200), comprising a grouting channel (510) located at the center, wherein a plurality of primary grouting cavities (520) and splitting grouting cavities (540) are provided in a circumferential direction around the periphery of the grouting channel (510); A grouting core tube (600) is adapted to the split grouting cavity (540) in each group of segmented grouting units (500), and the grouting core tube (600) sequentially penetrates the anchor seat (100), the rod body (200), and the grouting flow channel (510) of each group of segmented grouting units (500) from top to bottom.

2. The anti-floating anchor structure based on segmented grouting according to claim 1, characterized in that: In each set of segmented grouting units (500), the primary grouting cavities (520) and the splitting grouting cavities (540) are staggered, and a set of splitting grouting cavities (540) is provided between adjacent primary grouting cavities (520).

3. The anti-floating anchor structure based on segmented grouting according to claim 1, characterized in that: In each set of segmented grouting units (500), a primary grouting hole (530) is provided between the grouting flow channel (510) and each primary grouting cavity (520).

4. The anti-floating anchor structure based on segmented grouting according to claim 1, characterized in that: In each set of segmented grouting units (500), a first splitting piece (550) is provided between the grouting flow channel (510) and each splitting grouting cavity (540).

5. The anti-floating anchor structure based on segmented grouting according to claim 4, characterized in that: A second splitting piece (560) is provided at the connection between each group of splitting grouting cavities (540) and the adjacent primary grouting cavity (520).

6. The anti-floating anchor structure based on segmented grouting according to claim 4, characterized in that: The grouting core tube (600) comprises a tube body (610) with a closed lower end, a plurality of annular splitting pieces (620) being axially distributed on the tube body (610), the annular splitting pieces (620) corresponding one-to-one to each group of segmented grouting units (500); a plurality of third splitting pieces (630) being uniformly distributed circumferentially on the annular splitting piece (620), the third splitting pieces (630) being adapted to the first splitting pieces (550).

7. The anti-floating anchor structure based on segmented grouting according to claim 1, characterized in that: It also includes an anchor head (300), the anchor head (300) is connected to the lowest layer of the segmented grouting unit (500), the upper end of the anchor head (300) is communicated with the grouting flow channel (510) of the corresponding segmented grouting unit (500), and the lower end of the anchor head (300) is connected.

8. The anti-floating anchor structure based on segmented grouting according to claim 7, characterized in that: The invention also includes a steel strand unit (400), wherein the steel strand unit (400) includes a plurality of groups of main steel strands (410) uniformly distributed circumferentially within the rod body (200), and the main steel strands (410) sequentially penetrate the anchor seat (100), the rod body (200), the segmented grouting unit (500), and the anchor head (300) from top to bottom. The steel strand unit (400) further comprises a steel strand drum (420) located below the anchor head (300), wherein the steel strand drum (420) is formed by splicing together a plurality of transverse auxiliary steel strands (430) and longitudinal auxiliary steel strands (440), and the steel strand drum (420) is fixedly connected to each main steel strand (410).

9. The anti-floating anchor structure based on segmented grouting according to claim 7, characterized in that: The invention also includes a plurality of expansion units (800) distributed circumferentially on the anchor head (300), wherein the expansion units (800) include expansion plates (810) and first connecting rods (820) respectively rotatably mounted on the outer wall of the anchor head (300), wherein the middle portion of the expansion plate (810) is rotatably connected to a second connecting rod (830), wherein the second connecting rod (830) is hinged to the first connecting rod (820), and the anchor head (300) is further rotatably connected to a telescopic support rod (840), wherein the hinged portion between the second connecting rod (830) and the first connecting rod (820) is rotatably connected to an end of the telescopic support rod (840) away from the anchor head (300); and a connecting pipe (850) is connected between the telescopic support rod (840) and the inside of the anchor head (300).

10. An anti-floating anchor structure based on segmented grouting according to any one of claims 1 to 9, characterized in that: The invention also includes a hole plugging unit (700) located on the periphery of the rod body (200), the hole plugging unit (700) including slurry filling cavities (710) distributed in an annular shape, an expansion bladder (720) being provided on a side of the slurry filling cavity (710) away from the rod body (200), and a filling hole (730) being provided between the slurry filling cavity (710) and each splitting grouting cavity (540) of the uppermost segmented grouting unit (500).

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