A support device for anchor bolts in deep foundation pit soil layers

Abstract

This invention relates to the field of foundation pit support technology and discloses a support device for deep foundation pit soil layer anchors, comprising: a hollow anchor rod, the inner wall of which is provided with multiple slide rails, and the slide rails are provided with first through holes; a drive rod slidably connected inside the hollow anchor rod, the drive rod being provided with multiple external threads and fixedly fitted with multiple stop rings, the external threads being located above the stop rings; a connecting ring threaded to the external threads, the periphery of which is hinged to one end of multiple support plates, one end of each support plate being provided with multiple stop planes, enabling the support plates to be retracted into the hollow anchor rod or to be inserted through the first through holes, the support plates being slidably connected to the slide rails; and a drive component for driving the support plates to move toward the first through holes. This invention utilizes the lever principle to achieve the flipping of the support plates, effectively reducing the physical exertion of workers and enabling a larger effective contact area between the hollow anchor rod and the surrounding soil.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, and in particular to a support device for anchor bolts in deep foundation pit soil layers. Background Technology

[0002] Foundation pit support refers to the measures taken to support, reinforce, and protect the sidewalls and surrounding environment of a foundation pit in order to ensure the safety of underground structure construction and the surrounding environment. Among them, anchor bolt support is a common reinforcement and support method in surface engineering such as slopes and deep soil foundation pits, as well as in underground chamber construction such as tunnels and mining areas.

[0003] CN114908771B discloses a deep foundation pit pile-anchor combined slope protection structure and its construction method. This patent uses a push rod to move a control plate, which, under the action of a control rope, causes the reinforcing plate to rotate away from the support cylinder, thereby increasing the contact area between the support sleeve and the soil on the side wall of the foundation pit, further improving the fixing effect of the support cylinder and increasing the strength of the foundation pit side wall support. However, this patent has the following defects: (1) The flipping of the reinforcing plate is achieved by the force applied to the push rod, and the torque when the reinforcing plate flips is greater than the torque of the control rope, which will cause the push rod to require a lot of physical strength from the workers; (2) The flipping angle of the reinforcing plate depends entirely on the displacement of the push rod, and the structure does not have a displacement limiting device for the push rod, making it difficult to control the flipping angle of the reinforcing plate. Summary of the Invention

[0004] To overcome the shortcomings mentioned above, this invention aims to provide a support device for anchor bolts in deep foundation pits. It utilizes the lever principle to flip the support plate, allowing it to penetrate the first through hole, thereby increasing the contact area between the hollow anchor bolt and the surrounding soil. Because of the lever principle used during use, it effectively reduces the operational force and physical exertion of workers. Multiple stop surfaces are provided at one end of the support plate, and any one of these stop surfaces can abut against a stop ring, thus achieving a stable storage state and the support plate penetrating the first through hole.

[0005] To achieve the above objectives, the technical solution of the present invention is: a support device for anchor bolts in deep foundation pits, comprising:

[0006] A hollow anchor rod, wherein the inner sidewall of the hollow anchor rod is provided with multiple slide rails along its axial direction, and the slide rails are provided with first through holes;

[0007] A drive rod is coaxially arranged and slidably connected inside the hollow anchor rod. The drive rod is provided with multiple external threads and is fixedly fitted with multiple stop rings. When at least two of the stop planes abut against the stop rings respectively, the support plate can be retracted into the hollow anchor rod or the support plate can be passed through the first through hole. The multiple external threads are arranged one-to-one above the multiple stop rings.

[0008] Multiple connecting rings are threadedly connected to the multiple external threads one-to-one. One end of each connecting ring is hinged to one side of a plurality of support plates. One end of each support plate is provided with a plurality of abutment planes. The support plates are slidably connected to a slide rail.

[0009] A driving component for driving the support plate to move toward the first through hole;

[0010] By driving the drive rod to rotate, the stop ring moves along the axis of the drive rod, enabling any one of the stop planes to abut against the stop ring, thereby allowing the support plate to be retracted into the hollow anchor rod or the support plate to pass through the first through hole.

[0011] Furthermore, the driving component includes multiple driving rings, which are rotatably connected to the periphery of the driving rod via bearings. The multiple driving rings are arranged one-to-one above the multiple external threads, and the periphery of the driving rings is provided with multiple notches.

[0012] As the connecting ring moves closer to the driving ring along the axis of the driving rod, the notch is slidably connected to the support plate, and can drive the other end of the support plate to move toward and through the first through hole.

[0013] Furthermore, the outer wall of the drive ring is slidably connected to the inner wall of the hollow anchor rod.

[0014] Furthermore, the lower end of the first flip plate is hinged to the outer wall of the hollow anchor rod. The first flip plate can rotatably cover or open the first through hole. A first locking head is fixedly provided on the upper surface of the first flip plate near the outer wall of the hollow anchor rod. The first locking head is provided with locking through holes. The other end of the support plate can pass through both the first through hole and the locking through hole at the same time.

[0015] Furthermore, the upper end of the hollow anchor rod is threaded with an end cap, and when the other end of the support plate passes through both the first through hole and the embedded through hole, the lower end face of the end cap located inside the hollow anchor rod abuts against the upper end of the drive rod.

[0016] Furthermore, the lower end of the second flip plate is hinged to the outer wall of the hollow anchor rod. The second flip plate is a telescopic structure. The second flip plate can rotatably block or open the first through hole. A second locking head is fixedly provided on the upper surface of the second flip plate near the outer wall of the hollow anchor rod. A locking blind hole is provided on the lower end surface of the second locking head. The other end of the support plate can pass through the first through hole and be embedded in the locking blind hole.

[0017] Furthermore, the second flip plate includes:

[0018] The lower end of the lower flip plate is hinged to the outer wall of the hollow anchor rod. The upper surface of the lower flip plate is provided with sliding blind holes. A second through hole is opened on the side wall of the lower flip plate near the first through hole. The second through hole communicates with the sliding blind hole.

[0019] An upper rotating plate is slidably connected within the sliding blind hole, the upper rotating plate being located above the second through hole, and the upper end of the upper rotating plate is provided with the second locking head; and

[0020] A connecting rope, one end of which is fixedly connected to the lower end of the upper flip plate, and the other end of which passes through the second through hole and is connected to the support plate.

[0021] Furthermore, the upper end of the hollow anchor rod is threaded with an end cap, and when the other end of the support plate passes through the first through hole and is embedded in the fixed blind hole, the lower end face of the end cap located inside the hollow anchor rod abuts against the upper end of the drive rod.

[0022] Furthermore, an elastic grout stop plug is sleeved on the upper periphery of the hollow anchor rod, and a groove is provided on the upper surface of the elastic grout stop plug. The lower surface of the top plate of the end cap extends downward to form a retaining ring, which is disposed on the periphery of the hollow anchor rod and engages with the groove.

[0023] Furthermore, the end cap is provided with grouting holes, which are connected to the interior of the hollow anchor rod;

[0024] The hollow anchor rod has grout outlet holes on its side wall, and barbs are provided on the outer side wall of the hollow anchor rod. A conical block is provided at the lower end of the hollow anchor rod.

[0025] Compared with the prior art, the present invention has at least the following advantages:

[0026] Before use, the drive rod needs to be inserted into the hollow anchor rod, ensuring the support plate is completely retracted within it. This reduces frictional resistance during the insertion of the hollow anchor rod into the anchor hole. During use, insert the hollow anchor rod into the anchor hole and rotate the drive rod to slide the connecting ring upwards. The drive mechanism allows the support plate to rotate, further allowing it to penetrate the first through hole. Rotate the drive rod again to slide the connecting ring downwards, causing the other abutment surface of the support plate to contact the abutment ring, achieving a stable state where the support plate penetrates the first through hole. The use of a lever principle reduces the user's operating force and physical exertion. Because the support plate penetrates the first through hole, the effective contact area between the hollow anchor rod and the surrounding soil is increased, enhancing the strength of the pit sidewall support. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the support device for deep foundation pit soil anchors of the present invention;

[0029] Figure 2 This is a cross-sectional view of an embodiment of the support device for deep foundation pit soil anchors of the present invention;

[0030] Figure 3 For the present invention Figure 2 A magnified view of a portion of region A in the middle;

[0031] Figure 4 For the present invention Figure 2 A magnified view of a portion of region B in the middle;

[0032] Figure 5 This is a partial sectional view of another embodiment of the support device for deep foundation pit soil anchors of the present invention.

[0033] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of the support device for deep foundation pit soil layer anchors of the present invention;

[0034] Figure 7 This is a cross-sectional view of a second embodiment of the support device for deep foundation pit soil anchors of the present invention;

[0035] Figure 8 For the present invention Figure 7 A magnified view of a portion of region C.

[0036] Reference numerals: 1. Hollow anchor rod; 2. Slide rail; 3. First through hole; 4. Drive rod; 5. Stop ring; 6. Connecting ring; 7. Support plate; 8. Drive ring; 9. Notch; 10. First flip plate; 11. First locking head; 12. Second flip plate; 13. Second locking head; 14. Locking blind hole; 15. End cap; 16. Snap ring; 17. Elastic grout stop plug; 18. Snap groove; 19. Grouting hole; 20. Grout outlet hole; 21. Barb; 22. Conical block; 121. Lower flip plate; 122. Second through hole; 123. Upper flip plate; 124. Connecting rope. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1:

[0040] Reference Figure 1-4 This invention provides a support device for anchor bolts in deep foundation pits, comprising a hollow anchor bolt 1, a drive rod 4, a connecting ring 6, a support plate 7, and a drive component. The hollow anchor bolt 1 has multiple slide rails 2 arranged along its axial direction. The slide rails 2 are slidably connected to the support plate 7. Each slide rail 2 has a first through hole 3, which is rectangular. The support plate 7 selectively penetrates the first through hole 3. The drive rod 4 is coaxial with the hollow anchor bolt 1 and slidably connected inside the hollow anchor bolt 1. The drive rod 4 has multiple external threads, and multiple stop rings 5 ​​are fixedly fitted around its periphery. Each external thread is correspondingly positioned above a stop ring 5. The connecting ring 6 is provided with an internal thread, and multiple connecting rings 6 are threadedly connected to multiple external threads in a one-to-one correspondence. Multiple connecting lugs are provided on the circumference of the connecting ring 6. Multiple support plates 7 are hinged to one end of the connecting ring 6 through the connecting lugs. Multiple abutment planes are provided on one end of each support plate 7. Different abutment planes can abut against abutment rings 5, enabling different usage states of the support plate 7. The support plate 7 is slidably connected to the slide rail 2. The driving component is used to drive the support plate 7 to move towards the first through hole 3 to achieve the unfolded state of the support plate 7. In this invention, when any abutment plane on one end of the support plate 7 abuts against abutment ring 5, the support plate 7 is in a stable state, and the other end of the support plate 7 cannot rotate around one end of the support plate 7. (Refer to reference...) Figure 5As shown, in this invention, the support plate 7 is provided with two abutment planes, and the included angle between the two abutment planes is an obtuse angle. When one of the abutment planes at one end of the support plate 7 abuts against the abutment ring 5, the support plate 7 can be completely housed inside the hollow anchor rod 1. When the other abutment plane at one end of the support plate 7 abuts against the abutment ring 5, the support plate 7 can be installed through the first through hole 3, thereby increasing the contact area between the hollow anchor rod 1 and the surrounding soil, further improving the fixing effect of the hollow anchor rod 1, and increasing the strength of the foundation pit sidewall support. When the support plate 7 is perpendicular to the hollow anchor rod 1, a larger effective contact area between the hollow anchor rod 1 and the surrounding soil can be achieved.

[0041] In use, firstly, by causing relative rotation between the drive rod 4 and the stop ring 5, the connecting ring 6 moves away from the stop ring 5, and the support plate 7 is flipped to its retracted state; secondly, by causing relative rotation between the drive rod 4 and the stop ring 5, the connecting ring 6 moves closer to the stop ring 5 until one of the stop surfaces at one end of the support plate 7 abuts against the stop ring 5, at which point the support plate 7 can be inserted into the hollow anchor rod 1, and then the drive rod 4 is inserted into the hollow anchor rod 1; thirdly, the hollow anchor rod 1 is inserted into the anchor rod hole, and by driving the drive rod 4 to rotate, the connecting ring 6 moves away from the stop ring 5, and the drive rod 6 moves away from the stop ring 5, and the connecting ring ... The moving part causes the other end of the support plate 7 to move toward the first through hole 3, and when the other stop plane of one end of the support plate 7 is toward the stop ring 5, the driving rod 4 is rotated again, causing the connecting ring 6 to move closer to the stop ring 5 until the other stop plane of one end of the support plate 7 abuts against the stop ring 5. At this time, the support plate 7 is set through the first through hole 3, and part of the support plate 7 is inserted into the surrounding soil, thereby increasing the contact area between the hollow anchor rod 1 and the surrounding soil. Finally, concrete is poured into the hollow anchor rod 1. After the concrete reaches the design strength, a waist beam is installed at the end of the hollow anchor rod 1 that extends out of the pit wall.

[0042] In this design, when the hollow anchor rod 1 is inserted into the anchor hole, the support plate 7 is completely retracted into the hollow anchor rod 1, reducing the soil friction force on the hollow anchor rod 1. The hollow anchor rod 1 is then screwed through the first through hole 3. Compared to the traditional flipping method, this invention utilizes the lever principle, reducing the user's operating force and significantly reducing physical exertion. This design adjusts the flipping state of the support plate 7 through the stroke of the connecting ring 6 on the external thread, enabling both the retracted state and the state through the first through hole 3. It allows for precise adjustment of the flipping angle of the support plate 7, ensuring maximum effective contact area between the support plate 7 and the surrounding soil. Through this technical solution, the support plate 7 increases the contact area between the hollow anchor rod 1 and the soil on the pit sidewall, thereby improving the fixing effect of the hollow anchor rod 1 and increasing the strength of the pit sidewall support.

[0043] The effective contact area mentioned above refers to the projected area of ​​the portion of the support plate 7 that passes through the first through hole 3 along the axis of the hollow anchor rod 1.

[0044] Preferably, refer to Figure 4-5 As shown, to achieve the rotation of the drive rod 4, the support plate 7 rotates towards the first through hole 3. In this invention, the drive component includes multiple drive rings 8, which are rotatably connected to the periphery of the drive rod 4 via bearings. The multiple drive rings 8 are correspondingly positioned above multiple external threads, and multiple notches 9 are provided on the periphery of the drive rings 8. Simultaneously, to ensure that the drive rod 4 rotates coaxially with the hollow anchor rod 1, the outer wall of the drive ring 8 is transitionally fitted and slidably connected to the inner wall of the hollow anchor rod 1.

[0045] In use, the drive ring 8 is positioned above the external thread, and the support plate 7 is embedded within the hollow anchor rod 1, with a clearance fit between the drive ring 8 and the support plate 7. During the rotation of the drive rod 4, as the connecting ring 6 moves closer to the drive ring 8 along the axis of the drive rod 4, one of the stop surfaces gradually disengages from the stop ring 5. At this point, the support plate 7 can flip, and the notch 9 slides into contact with the support plate 7, thereby driving the other end of the support plate 7 towards and through the first through hole 3. Furthermore, the notch allows concrete to flow through, filling the hollow anchor rod 1.

[0046] Continue to refer to Figure 4-5 As shown, in order to ensure the sealing of the first through hole 3 when the hollow anchor rod 1 is inserted into the anchor rod hole and to prevent soil from entering the hollow anchor rod 1 during the insertion process, the lower end of the first flip plate 10 is hinged to the outer wall of the hollow anchor rod 1. The projected area of ​​the first flip plate 10 is larger than the projected area of ​​the first through hole 3, and the width of the first flip plate 10 is larger than the width of the first through hole 3. The first flip plate 10 can rotatably block or open the first through hole 3. A first embedding head 11 is fixedly provided on the upper plate surface of the first flip plate 10 near the outer wall of the hollow anchor rod 1. The first embedding head 11 is provided with embedding through holes. The other end of the support plate 7 can pass through the first through hole 3 and the embedding through hole at the same time.

[0047] It should be noted that, since the first mounting head 11 is fixedly provided on the upper end plate surface of the first flip plate 10, when the hollow anchor rod 1 is inserted into the anchor rod hole, there is a gap between the upper end of the first flip plate 10 and the outer side wall of the hollow anchor rod 1. In view of this, in order to reduce the amount of mud entering the hollow anchor rod 1, the width of the first flip plate 10 in this invention is greater than the width of the first through hole 3, and the height of the first flip plate 10 is greater than the height of the first through hole 3.

[0048] During the process of the hollow anchor rod 1 being inserted into the anchor rod hole, the first flipping plate 10 adheres tightly to the outer wall of the hollow anchor rod 1 under the action of soil friction. At this time, the first flipping plate 10 blocks the first through hole 3. During the process of the support plate 7 penetrating the first through hole 3, the other end of the support plate 7 interacts with and slides with the first flipping plate 10. Furthermore, the other end of the support plate 7 is inserted into the first fixing head 11, thereby realizing the simultaneous flipping of the support plate 7 and the first flipping plate 10. Since the width of the support plate 7 is less than or equal to the width of the first through hole 3, and the width of the first through hole 3 is less than the width of the first flipping plate 10, after the support plate 7 is inserted into the first fixing head 11, it drives the first flipping plate 10 to flip simultaneously, further increasing the contact area between the hollow anchor rod 1 and the soil, improving the fixing effect of the hollow anchor rod 1, and further enhancing the strength of the foundation pit sidewall support.

[0049] Understandably, in order to increase the effective contact area between the support plate 7 and the surrounding soil, when the support plate 7 passes through the first through hole 3 and the anchoring through hole at the same time, the support plate 7 and the hollow anchor rod 1 are in a perpendicular state. At this time, the first flipping plate 10 and the hollow anchor rod 1 are also in a perpendicular state.

[0050] Preferably, refer to Figure 3 The upper end of the hollow anchor rod 1 is threaded with an end cap 15. When the other end of the support plate 7 can pass through both the first through hole 3 and the fixed through hole, the lower end face of the end cap 15 inside the hollow anchor rod 1 abuts against the upper end of the drive rod 4. At this time, in addition to the force of the fixed through hole, the support plate 7 is also subjected to the downward pressure of the connecting ring 6 and the upward support force of the first through hole 3. The support plate 7 is in a state of static equilibrium. At this time, the support plate 7 abuts against the lower edge of the first through hole 3. Once the hollow anchor rod 1 shows an upward movement tendency, the hollow anchor rod 1 will first contact the support plate 7, thereby effectively preventing the hollow anchor rod 1 from moving upward.

[0051] Preferably, refer again Figure 1-2 As shown, an elastic grout-stopping plug 17 is fitted around the upper circumference of the hollow anchor rod 1. A groove 18 is provided on the upper surface of the elastic grout-stopping plug 17. A retaining ring 16 extends downwards from the lower surface of the top plate of the end cap 15, and is positioned around the hollow anchor rod 1. The retaining ring 16 engages with the groove 18, and the upper surface of the elastic grout-stopping plug 17 engages with the retaining ring 16. The elastic grout-stopping plug 17 is elastic. During concrete pouring, it deforms to create a gap between itself and the anchor hole, expelling air from the anchor hole. When concrete slurry is expelled, grouting can be stopped. At this point, the elastic grout-stopping plug 17 returns to its original shape, sealing the anchor hole opening and the hollow anchor rod 1. The structure of the retaining ring 16 and the groove 18 facilitates the secure fastening of the elastic grout-stopping plug 17.

[0052] Preferably, the end cap 15 is provided with grouting holes 19, which are connected to the interior of the hollow anchor rod 1; the side wall of the hollow anchor rod 1 is provided with grout outlet holes 20, and the outer side wall of the hollow anchor rod 1 is provided with barbs 21, which can effectively prevent the hollow anchor rod 1 from coming out after entering the anchor hole; and the lower end of the hollow anchor rod 1 is provided with a conical block 22.

[0053] Example 2:

[0054] Reference Figure 6-8 As shown, the difference between this embodiment and embodiment one is that this embodiment uses a second flip plate 12, which is a telescopic structure, and the structure of the second flip plate 12 is different from that of the first flip plate 10.

[0055] Preferably, see specific reference. Figure 8 The lower end of a second flip plate 12 is hinged to the outer wall of the hollow anchor rod 1. The second flip plate 12 can rotatably block or open the first through hole 3, and the width of the second flip plate 12 is greater than the width of the first through hole 3. A second embedding head 13 is fixedly provided on the upper end of the second flip plate 12 near the outer wall of the hollow anchor rod 1. An embedding blind hole 14 is provided at the lower end of the second embedding head 13. The other end of the support plate 7 can pass through the first through hole 3 and be embedded in the embedding blind hole 14. The second flip plate 12 is configured as a telescopic structure. During the process of the hollow anchor rod 1 being inserted into the anchor hole, the second flip plate 12 is in a contracted state, which can reduce the friction between the hollow anchor rod 1 and the soil. In addition, after the support plate 7 is flipped, the second flip plate 12 can provide an extension surface of the same length as the part of the support plate 7 that passes through the first through hole 3, so that the force between the support plate 7 and the second flip plate 12 is more uniform.

[0056] Specifically, the second flip plate 12 includes a lower flip plate 121, an upper flip plate 123, and a connecting rope 124. The lower end of the lower flip plate 121 is hinged to the outer wall of the hollow anchor rod 1. The upper surface of the lower flip plate 121 is provided with sliding blind holes. The lower flip plate 121 is provided with a second through hole 122 on the side wall near the first through hole 3. The second through hole 122 communicates with the sliding blind hole. The upper flip plate 123 is slidably connected in the sliding blind hole. The upper flip plate 123 is located above the second through hole 122. The upper end of the upper flip plate 123 is provided with a second locking head 13. One end of the connecting rope 124 is fixedly connected to the lower end of the upper flip plate 123. The other end of the connecting rope 124 passes through the second through hole 122 and is connected to the support plate 7.

[0057] Optionally, when the upper end of the hollow anchor rod 1 is threadedly connected to an end cap 15, and the other end of the support plate 7 can pass through the first through hole 3 and be embedded in the fixed blind hole 14, the lower end face of the end cap 15 set in the hollow anchor rod 1 abuts against the upper end of the drive rod 4.

[0058] Specific reference Figure 8A base plate is provided at the connection between the lower end of the hollow anchor rod 1 and the conical block 22. When the hollow anchor rod 1 is inserted into the anchor rod hole, the lower end of the drive rod 4 abuts against the base plate. At this time, the other end of the support plate 7 is opposite to the first through hole 3. One end of the support plate 7 is located below the first through hole 3, and the other end of the connecting rope 124 is connected to the middle of the support plate 7. The other end of the connecting rope 124 is located at the lower end of the first through hole 3. One end of the connecting rope 124 exerts a downward pulling force on the upper flip plate 123, which can prevent the upper flip plate 123 from coming out of the sliding blind hole. When the support plate 7 flips, one end of the support plate 7 gradually rises, and the other end of the support plate 7 abuts against the second locking head 13, driving the upper flip plate 123 to slide outward along the sliding blind hole. Further, the other end of the support plate 7 passes through the first through hole 3 and is embedded in the locking blind hole 14. At this time, the connecting rope 124 provides a force to the upper flip plate 123 in the direction of the axis of the hollow anchor rod 1.

[0059] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0060] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A support device for anchor bolts in deep foundation pits, characterized in that, include: Hollow anchor rod (1), the inner sidewall of the hollow anchor rod (1) is provided with multiple slide rails (2) along its axial direction, and the slide rails (2) are provided with first through holes (3); A drive rod (4) is coaxially arranged and slidably connected inside the hollow anchor rod (1). The drive rod (4) is provided with multiple external threads and is fixedly fitted with multiple stop rings (5). The multiple external threads are arranged one-to-one above the multiple stop rings (5). Multiple connecting rings (6) are threadedly connected to the external threads one-to-one. One end of multiple support plates (7) is hinged to the circumference of each connecting ring (6). One end of each support plate (7) is provided with multiple abutment planes. When any one of the abutment planes abuts against the abutment ring (5), the support plate (7) is in a stable state. At this time, the other end of the support plate (7) cannot rotate around one end of the support plate (7). The support plate (7) is slidably connected to the slide rail (2). A drive member for driving the support plate (7) to move toward the first through hole (3).

2. The support device for deep foundation pit soil layer anchors according to claim 1, characterized in that, The driving component includes multiple driving rings (8), which are rotatably connected to the periphery of the driving rod (4) via bearings. The multiple driving rings (8) are arranged one-to-one above the multiple external threads, and the periphery of the driving rings (8) is provided with multiple notches (9). During the movement of the connecting ring (6) toward the driving ring (8) along the axis of the driving rod (4), the notch (9) is slidably connected to the support plate (7) and can drive the other end of the support plate (7) to move toward and through the first through hole (3).

3. The support device for deep foundation pit soil layer anchors according to claim 2, characterized in that, The outer wall of the drive ring (8) is slidably connected to the inner wall of the hollow anchor rod (1).

4. The support device for deep foundation pit soil layer anchors according to claim 3, characterized in that, The lower end of the first flip plate (10) is hinged to the outer wall of the hollow anchor rod (1). The first flip plate (10) can rotatably block or open the first through hole (3). The width of the first flip plate (10) is greater than the width of the first through hole (3). A first embedding head (11) is fixedly provided on the upper plate surface of the first flip plate (10) near the outer wall of the hollow anchor rod (1). The first embedding head (11) is provided with embedding through holes. The other end of the support plate (7) can pass through the first through hole (3) and the embedding through hole at the same time.

5. The support device for deep foundation pit soil layer anchors according to claim 4, characterized in that, The upper end of the hollow anchor rod (1) is threaded with an end cap (15). When the other end of the support plate (7) passes through the first through hole (3) and the embedded through hole at the same time, the lower end face of the end cap (15) inside the hollow anchor rod (1) abuts against the upper end of the drive rod (4).

6. The support device for deep foundation pit soil layer anchors according to claim 3, characterized in that, The lower end of the second flip plate (12) is hinged to the outer wall of the hollow anchor rod (1). The second flip plate (12) is a telescopic structure. The second flip plate (12) can rotatably block or open the first through hole (3). The width of the second flip plate (12) is greater than the width of the first through hole (3). A second embedding head (13) is fixedly provided on the upper plate surface of the second flip plate (12) near the outer wall of the hollow anchor rod (1). An embedding blind hole (14) is provided on the lower end surface of the second embedding head (13). The other end of the support plate (7) can penetrate the first through hole (3) and be embedded in the embedding blind hole (14).

7. The support device for deep foundation pit soil anchors according to claim 6, characterized in that, The second flip plate (12) includes: The lower end of the flip plate (121) is hinged to the outer wall of the hollow anchor rod (1). The upper surface of the flip plate (121) is provided with sliding blind holes. A second through hole (122) is opened on the side wall of the flip plate (121) near the first through hole (3). The second through hole (122) is connected to the sliding blind hole. An upper flip plate (123) is slidably connected within the sliding blind hole. The upper flip plate (123) is located above the second through hole (122), and the upper end of the upper flip plate (123) is provided with the second locking head (13). A connecting rope (124) is provided, one end of which is fixedly connected to the lower end of the upper flip plate (123), and the other end of which passes through the second through hole (122) and is connected to the support plate (7).

8. The support device for deep foundation pit soil layer anchors according to claim 7, characterized in that, The upper end of the hollow anchor rod (1) is threaded with an end cap (15). When the other end of the support plate (7) passes through the first through hole (3) and is embedded in the fixed blind hole (14), the lower end face of the end cap (15) inside the hollow anchor rod (1) abuts against the upper end of the drive rod (4).

9. The support device for deep foundation pit soil anchors according to claim 5 or 8, characterized in that, The upper circumference of the hollow anchor rod (1) is fitted with an elastic grout stop plug (17), and the upper surface of the elastic grout stop plug (17) is provided with a groove (18). The lower surface of the top plate of the end cap (15) extends downward to form a retaining ring (16). The retaining ring (16) is located on the circumference of the hollow anchor rod (1), and the retaining ring (16) engages with the groove (18).

10. The support device for deep foundation pit soil layer anchors according to claim 9, characterized in that, The end cap (15) is provided with grouting holes (19), which are connected to the interior of the hollow anchor rod (1); The hollow anchor rod (1) has grout outlet holes (20) on its side wall, and the outer side wall of the hollow anchor rod (1) is provided with barbs (21), and the lower end of the hollow anchor rod (1) is provided with a conical block (22).

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