Composite type anti-pulling foundation anchor rod

Abstract

The utility model relates to the technical field of anchor rods, in particular to a composite type anti-pulling foundation anchor rod. According to the specific technical scheme, the composite type anti-pulling foundation anchor rod comprises an anchor rod rib body, the anchor rod rib body is sleeved with a pressure-bearing plate, the anchor rod rib body is sleeved with a sleeve, one end of the sleeve abuts against the pressure-bearing plate, a plurality of anti-pulling plates are hinged to the pressure-bearing plate, torsion springs are arranged at the hinged positions of the anti-pulling plates and the pressure-bearing plate, and the torsion springs are connected with the sleeve. And when the tensile plate is folded to the side wall of the anchor rod rib body, the tensile plate is located in the sleeve. The utility model solves the problems of stress concentration and low bearing efficiency of an anchoring section and a rock-soil interface of a traditional tension type anchor rod, and the problem of complicated construction of a dispersed anchor rod.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor rods, in particular to a composite anti-pullout foundation anchor rod. Background Art

[0002] With the rapid development of cities, a large number of municipal projects such as urban construction projects, subways and integrated pipelines have been newly built, which has led to an urgent need for anchoring of a large number of foundation pits, slopes, tunnels, underground projects and other anti-floating projects. Anchor rods have been widely used as a key technology in anchoring projects. Once the anchoring function of anchor rods fails, it will lead to major engineering accidents and have adverse social impacts.

[0003] For anchor bolting projects, the pull-out bearing capacity and bearing performance of the anchor bolt are important and decisive factors that directly affect the safety of the anchor bolting project. Traditional tension-type anchor bolts are prone to progressive interface damage due to the high stress concentration phenomenon at the interface between the anchoring section and the rock and soil, which in turn leads to anchor bolt damage. The traditional pressure-dispersed anchor bolt technology is a multiple unit anchoring section set up simultaneously in a borehole. Each unit anchoring section uses an independent rod body and anchoring section, which makes it difficult or even impossible for each unit anchoring section to bear load evenly, which easily causes the unit anchoring section with a larger force to be damaged first, and then causes the remaining unit anchoring sections to be damaged successively. In addition, the rod body of each unit anchoring section is set independently, resulting in a large number of anchor rod bodies, which leads to a cumbersome anchor rod body manufacturing process and a long construction period.

[0004] In order to solve the difficult problems of stress concentration and low bearing efficiency at the interface between the anchoring section and rock and soil of traditional tension-type anchor rods, as well as the cumbersome construction of dispersed anchor rods, a composite anchor rod is provided which can significantly reduce the shear stress concentration phenomenon at the interface between the anchor body and the rock and soil body and greatly improve the pull-out bearing capacity of the anchor rod. Summary of the invention

[0005] In view of the deficiencies in the prior art, the utility model provides a composite pull-out resistant foundation anchor rod, which solves the problems of stress concentration and low bearing efficiency at the interface between the anchoring section of the traditional tension type anchor rod and the rock and soil, as well as the problem of complicated construction of the dispersed anchor rod.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The utility model discloses a composite pull-out resistant foundation anchor rod, comprising an anchor rod tendon body, a pressure plate is sleeved on the anchor rod tendon body, a sleeve is sleeved on the anchor rod tendon body, one end of the sleeve is against the pressure plate, a plurality of tensile plates are hinged on the pressure plate, a torsion spring is arranged at the hinge between the tensile plate and the pressure plate, and when the tensile plates are retracted to the side walls of the anchor rod tendon body, the tensile plates are located in the sleeve.

[0008] Preferably, the anchor rod body is a threaded rod, and the other end of the sleeve is fixed to the anchor rod body through a locking sleeve.

[0009] Preferably, an annular groove for accommodating a tensile plate is provided on the inner wall of one end of the sleeve, a accommodating groove is provided on the top surface of the pressure-bearing plate around the anchor bar body, and one end of the tensile plate is rotatably arranged in the accommodating groove via a rotating shaft.

[0010] Preferably, a plurality of support grooves are longitudinally arranged on the side surface of the tensile plate corresponding to the anchor rod reinforcement body, and the support grooves are transversely arranged with both ends passing through the plate surface of the tensile plate.

[0011] Preferably, a limiting groove is provided on the plate surface of the pressure plate at a position corresponding to the hinge of the tensile plate, and the side of the limiting groove facing the accommodating groove is an inclined surface inclined toward the accommodating groove, and a telescopic rod is hinged in the limiting groove through a rotating shaft, and the other end of the telescopic rod is hinged to the outer plate surface of the tensile plate, and a notch is provided at one end of the sleeve for the telescopic rod to pass through.

[0012] Preferably, a conical support block is sleeved and fixed on the bottom surface of the pressure plate and the anchor rod body, and the tip of the support block is arranged downward and the plane is in contact with the bottom surface of the pressure plate.

[0013] Preferably, one end of the locking sleeve is a straight tube section, and the other end is a trumpet-shaped limiting section. The inner wall of the straight tube section is provided with an internal thread adapted to the anchor rod body. The large diameter end of the limiting section is larger than the outer diameter of the casing, and the small diameter end is less than or equal to the outer diameter of the casing.

[0014] Preferably, a plurality of locking plates are arranged around the anchor rod body at the other end of the sleeve, the locking plates are arranged apart from each other, and the limiting section is adapted to the locking plates.

[0015] Preferably, a circle of trumpet-shaped guiding inclined surfaces is provided on the inner wall of the large-diameter end of the limiting section.

[0016] Preferably, the inner diameter of the straight tube section is smaller than the minimum inner diameter of the limiting section.

[0017] The utility model has the following beneficial effects:

[0018] 1. The utility model splits the single anchoring section of the traditional anchor into a composite anchoring section with both a pressure-bearing anchoring section and a tension-bearing anchoring section by fixing a pressure-bearing plate and a sleeve on the anchor rod reinforcement body, thereby greatly increasing the effective anchoring length of the anchor rod, and relying on the pressure-bearing anchoring section and the tension-bearing anchoring section to synergistically share the external load, greatly reducing the peak shear stress at the interface between the anchoring section and the rock and soil, significantly improving the pull-out bearing capacity of the anchor rod, and reducing the project cost.

[0019] 2. The pressure plate fixed on the anchor bar body can be constructed in the form of welding, extrusion sleeve, screw connection, etc., which has the advantages of easy and fast installation; by hingedly connecting the tensile plate on the pressure plate and abutting and fixing it through the sleeve, the one-way force transmission mode of the traditional tension anchor body and the rock and soil interface is optimized to a two-way transmission mode, and through collaborative bearing, the bearing efficiency of the anchoring section is greatly improved, and the pull-out bearing capacity is significantly improved. Compared with the traditional tension anchor, under the same anchoring length, the utility model can well improve the pull-out bearing capacity of the anchor, which is of great significance to saving engineering costs and shortening engineering construction periods. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 for Figure 1 Middle A is a partial enlarged view;

[0022] Figure 3 is a top view of the pressure plate;

[0023] Figure 4 It is a schematic diagram of the locking sleeve structure;

[0024] Figure 5 This is a schematic diagram of the structure after the tensile plate is opened;

[0025] In the figure: anchor rod body 1, pressure plate 2, sleeve 3, tensile plate 4, locking sleeve 5, straight tube section 51, limiting section 52, guide inclined surface 53, annular groove 6, accommodating groove 7, supporting groove 8, limiting groove 9, inclined surface 10, telescopic rod 11, notch 12, support block 13, locking plate 14. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0028] refer to Figure 1-Figure 5The utility model discloses a composite pull-out resistant foundation anchor, including an anchor bar body 1, wherein the anchor bar body 1 is a threaded rod, and a pressure plate 2 is sleeved on the anchor bar body 1. The pressure plate and the anchor bar body can be threadedly connected, welded, or extruded. For ease of installation, this embodiment is preferably threadedly fixed. A sleeve 3 is sleeved on the anchor bar body 1, and one end of the sleeve 3 is against the pressure plate 2, and the other end of the sleeve 3 is fixed to the anchor bar body 1 through a locking sleeve 5. A plurality of tensile plates 4 are hinged on the pressure plate 2, and a torsion spring is provided at the hinge between the tensile plates 4 and the pressure plate 2. When the tensile plates 4 are retracted to the side wall of the anchor bar body 1, the tensile plates 4 are located in the sleeve 3. It should be noted that the setting of the tensile plates can be opened when the anchor bar body is installed to increase the tensile resistance of the entire anchor.

[0029] Furthermore, an annular groove 6 for accommodating the tensile plate 4 is provided on the inner wall at one end of the sleeve 3, and an accommodating groove 7 is provided on the top surface of the pressure plate 2 around the anchor bar 1, and one end of the tensile plate 4 is arranged in the accommodating groove 7 by rotating the rotating shaft. It should be noted that the setting of the annular groove can reduce the diameter of the sleeve, thereby reducing the gap between the sleeve and the anchor bar. The accommodating groove can be annular or an independently arranged groove. When it is annular, one end of the sleeve can extend into the accommodating groove and abut against the inner bottom of the accommodating groove. When it is an independent groove, a notch needs to be opened at the bottom end of the sleeve so that the protrusions between adjacent accommodating grooves can extend into the notch. In order to facilitate operation and installation, the accommodating groove of this embodiment is preferably annular. One end of the tensile plate connected to the rotating shaft is a connecting fork structure, and the torsion spring is sleeved on the rotating shaft at the groove in the middle of the connecting fork structure, one end of which abuts against the tensile plate and the other end of which abuts against the accommodating groove. When the tensile plate is retracted to the anchor bar, the torsion spring is forced to shrink. When the sleeve releases the restriction on the tensile plate, the tensile plate opens under the action of the torsion spring.

[0030] Furthermore, in order to make the tensile plate closer to the anchor bar, the shape of the tensile plate is preferably arc-shaped, fitting the outer wall of the anchor bar as much as possible, and adjacent tensile plates are set apart, and the spacing size can be set according to actual conditions.

[0031] Furthermore, when the tensile plate is opened, in order to prevent one end of the sleeve from slipping on the plate surface of the tensile plate, a plurality of support grooves 8 are longitudinally arranged on the side surface of the tensile plate 4 corresponding to the anchor bar 1, and the support grooves are transitioned in a circular arc. The support grooves 8 are arranged transversely and both ends penetrate the plate surface of the tensile plate 4. When the tensile plate is opened, when one end of the sleeve abuts against the inner plate surface of the tensile plate, the pipe mouth of the sleeve abuts in the support groove. The arrangement of multiple support grooves enables the sleeve to adapt to tensile plates with different opening angles.

[0032] Furthermore, in order to enhance the stability of the tensile plate after opening, a limiting groove 9 is provided on the surface of the pressure plate 2 at a position corresponding to the hinge of the tensile plate 4. The side of the limiting groove 9 facing the accommodating groove 7 is an inclined surface 10 inclined toward the accommodating groove 7. A telescopic rod 11 is hinged in the limiting groove 9 through a rotating shaft. The other end of the telescopic rod 11 is hinged to the outer surface of the tensile plate 4. A notch 12 for the telescopic rod 11 to pass through is provided at one end of the sleeve 3. It should be noted that the setting of the inclined surface 10 satisfies that one side of the telescopic rod fits exactly with the inclined surface after the tensile plate is folded. At the same time, when the tensile plate is opened to the maximum angle, one side of the telescopic rod abuts against the side wall of the limiting groove (the side wall is the side wall corresponding to the inclined surface), thereby controlling the opening angle of the tensile plate.

[0033] Furthermore, in order to increase the stability of the pressure plate on the anchor bar, a conical support block 13 is fixedly mounted on the bottom surface of the pressure plate 2 and the anchor bar 1, with the tip of the support block 13 facing downward and the plane in contact with the bottom surface of the pressure plate 2. It can be understood that the support block can be truncated cone-shaped, with the diameter of the smallest diameter end being the same as the outer diameter of the anchor bar, and the end face of the largest diameter end being in close contact with the bottom surface of the pressure plate. The support block and the anchor bar can be threaded or welded.

[0034] Furthermore, the locking sleeve is used to fix the sleeve to the anchor bar body. One end of the locking sleeve 5 is a straight section 51, and the other end is a trumpet-shaped limiting section 52. The inner wall of the straight section 51 is provided with an internal thread adapted to the anchor bar body 1. The large diameter end of the limiting section 52 is larger than the outer diameter of the sleeve 3, and the small diameter end is smaller than or equal to the outer diameter of the sleeve 3. It should be noted that the locking sleeve is used as a connector between the anchor bar body and the sleeve. The limiting section is used to make the other end of the sleeve stuck into its inner cavity to achieve the purpose of fixing the sleeve. Since the diameter of the inner cavity of the limiting section gradually decreases from the pipe mouth toward the straight section, the sleeve is gradually pressed against the limiting section during the process of screwing the locking sleeve.

[0035] Furthermore, in order to strengthen the connection strength between the locking sleeve and the sleeve, the other end of the sleeve 3 is provided with a plurality of locking plates 14 around the anchor bar 1, and there are at least two locking plates, which are arc-shaped, and the locking plates 14 are arranged apart from each other, and the spacing distance is set according to the actual situation. The limiting section 52 is adapted to the locking plate 14. It should be noted that: the inner diameter of the straight section 51 is smaller than the minimum inner diameter of the limiting section 52, so that there is a platform between the straight section and the limiting section, so that the top of the locking plate can be against the platform. A circle of horn-shaped guiding inclined surfaces 53 are provided on the inner wall of the large diameter end of the limiting section 52, so that the locking plate can be smoothly inserted into the limiting section. At the same time, in the process of screwing the locking sleeve, under the action of the limiting section, the plurality of locking plates are inclined toward the anchor bar until the end of the locking plate is inserted into the gap between the minimum diameter of the limiting section and the anchor bar and clamped, so as to achieve the purpose of the locking plate being close to the anchor bar and then fixing the sleeve.

[0036] Furthermore, anti-slip protrusions may be provided on the plate surface corresponding to the locking plate and the anchor bar body to increase the friction between the locking plate and the anchor bar body, thereby increasing the stability of the sleeve and the anchor bar body. And / or, threads are provided on the outer plate surface of the locking plate, and internal threads matching the threads on the locking plate are provided on the inner wall of the limiting section. In the process of screwing the locking sleeve, the locking plate and the locking sleeve are also threadedly connected, thereby strengthening the fixing of the locking sleeve to the locking plate.

[0037] When using the utility model, firstly, the end of the grouting pipe is tied and fixed to the bottom of the anchor bar body, and then inserted into the borehole together with the anchor bar body. Then, the sleeve is pulled outside the borehole to open the tensile plate under the action of the torsion spring. Subsequently, the sleeve is rotated to make the notch 12 away from the tensile plate, and then the sleeve is pushed into the borehole to make the opened tensile plate open as much as possible under the action of the external force until the end of the tensile plate is against the inner wall of the borehole. At this time, under the action of the support groove, the sleeve is prevented from sliding on the plate surface of the tensile plate. Then, the sleeve and the anchor bar body are locked and fixed by the locking sleeve. After fixing, cement or mortar is poured into the borehole through the grouting pipe. After the pouring is completed, the grouting pipe is pulled out. After the strength of the cement or mortar reaches the design requirements, the pressure pad and anchor are installed to tension and lock the entire composite anti-pullout foundation anchor.

[0038] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A composite anti-pullout foundation anchor, comprising an anchor bar body (1), characterized in that: A pressure plate (2) is sleeved on the anchor bar body (1), and a sleeve (3) is sleeved on the anchor bar body (1). One end of the sleeve (3) is in contact with the pressure plate (2). A plurality of tensile plates (4) are hinged on the pressure plate (2). Torsion springs are provided at the hinges between the tensile plates (4) and the pressure plate (2). When the tensile plates (4) are retracted to the side walls of the anchor bar body (1), the tensile plates (4) are located in the sleeve (3).

2. The composite anti-pullout foundation anchor according to claim 1, characterized in that: The anchor rod body (1) is a threaded rod, and the other end of the sleeve (3) is fixed to the anchor rod body (1) via a locking sleeve (5).

3. The composite anti-pullout foundation anchor according to claim 1, characterized in that: An annular groove (6) for accommodating the tensile plate (4) is provided on the inner wall of one end of the sleeve (3), a receiving groove (7) is provided on the top surface of the pressure-bearing plate (2) around the anchor bar body (1), and one end of the tensile plate (4) is rotatably arranged in the receiving groove (7) via a rotating shaft.

4. A composite anti-pullout foundation anchor according to any one of claims 1 to 3, characterized in that: A plurality of support grooves (8) are longitudinally arranged on the side surface of the tensile plate (4) corresponding to the anchor bar body (1); the support grooves (8) are transversely arranged with both ends penetrating the plate surface of the tensile plate (4).

5. The composite anti-pullout foundation anchor according to claim 3, characterized in that: A limiting groove (9) is provided on the surface of the pressure plate (2) at a position corresponding to the hinged position of the tensile plate (4); the side of the limiting groove (9) facing the accommodating groove (7) is an inclined surface (10) inclined toward the accommodating groove (7); a telescopic rod (11) is hinged in the limiting groove (9) via a rotating shaft; the other end of the telescopic rod (11) is hinged to the outer surface of the tensile plate (4); and a notch (12) is provided at one end of the sleeve (3) for the telescopic rod (11) to pass through.

6. The composite anti-pullout foundation anchor according to claim 1, characterized in that: A conical support block (13) is sleeved and fixed on the bottom surface of the pressure plate (2) and the anchor bar body (1), and the tip of the support block (13) is arranged downward and the plane contacts the bottom surface of the pressure plate (2).

7. The composite anti-pullout foundation anchor according to claim 2, characterized in that: One end of the locking sleeve (5) is a straight tube section (51), and the other end is a trumpet-shaped limiting section (52). The inner wall of the straight tube section (51) is provided with an internal thread adapted to the anchor bar body (1). The large diameter end of the limiting section (52) is larger than the outer diameter of the sleeve (3), and the small diameter end is smaller than or equal to the outer diameter of the sleeve (3).

8. The composite anti-pullout foundation anchor according to claim 7, characterized in that: The other end of the sleeve (3) is provided with a plurality of locking plates (14) around the anchor bar body (1), the locking plates (14) are spaced apart from each other, and the limiting section (52) is adapted to fit the locking plates (14).

9. The composite anti-pullout foundation anchor according to claim 8, characterized in that: A circle of trumpet-shaped guiding inclined surface (53) is arranged on the inner wall of the large-diameter end of the limiting section (52).

10. The composite anti-pullout foundation anchor according to claim 7, characterized in that: The inner diameter of the straight tube section (51) is smaller than the minimum inner diameter of the limiting section (52).

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