Concrete embedded anchor bolt fixing device

Abstract

The invention relates to a concrete pre-embedded anchor bolt fixing device which comprises a pre-embedded assembly and a fixing assembly, the pre-embedded assembly comprises an outer sleeve and a core rod, the outer sleeve is provided with a large-diameter part and a small-diameter part, a mounting cavity is formed in the outer sleeve in the axial direction of the outer sleeve, part of the core rod is arranged in the mounting cavity, and the rigidity of the core rod is larger than that of the outer sleeve; the fixing assembly comprises a screw rod, an anchoring piece and a shear-resistant sleeve, the screw rod is sleeved with the anchoring piece and the shear-resistant sleeve, the screw rod comprises an anchor head, a plurality of open pieces which are arranged at intervals in a surrounding mode are arranged on the side, close to the anchor head, of the anchoring piece, and the shear-resistant sleeve can abut against the anchoring piece. The embedded assembly can enable the concrete member to form a taper hole and a diameter hole which are communicated with each other, and the open piece expands in the direction of the anchor head, so that the screw rod is fixed, and installation of other devices is achieved.

Description

Technical Field

[0001] The present invention relates to the field of anchor bolt equipment, in particular to a concrete pre-embedded anchor bolt fixing device. Background Art

[0002] At present, precast concrete components are widely used in domestic concrete buildings, which has greatly improved the level of industrial production and construction speed. However, to install electromechanical equipment on concrete components, workers still need to manually drill holes in the concrete components using tools such as electric hammers. After the holes are drilled, the electromechanical equipment are installed using anchor bolts. When workers drill holes with electric hammers, a large amount of dust is generated, which not only affects the workers' health but also has relatively low efficiency. Summary of the Invention

[0003] The object of the present invention is to provide a concrete pre-embedded anchor bolt fixing device, which has the characteristics of preset anchor bolt holes and the like and has good applicability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A concrete embedded anchor fixing device, comprising: an embedded assembly, comprising an outer sleeve and a core rod, wherein the outer sleeve has a large diameter portion and a small diameter portion, and an installation cavity is provided in the outer sleeve along its axial direction, a portion of the core rod is disposed in the installation cavity, and the rigidity of the core rod is greater than that of the outer sleeve;

[0006] The fixing assembly includes a screw rod, an anchoring plate and a shear sleeve which are sleeved outside the screw rod. The screw rod includes an anchor head. The side of the anchoring plate close to the anchor head is provided with a plurality of open plates which are arranged at intervals around the anchor head. The shear sleeve can abut against the anchoring plate.

[0007] Preferably, the outer diameter of the large diameter portion gradually increases in a direction away from the small diameter portion;

[0008] The screw further comprises a screw body integrally formed with the anchor head, wherein the outer diameter of the anchor head gradually increases in a direction away from the screw body;

[0009] The maximum outer diameter of the anchor head is smaller than or equal to the outer diameter of the small diameter portion.

[0010] Preferably, the radial thickness of the opening gradually increases in a direction approaching the anchor head.

[0011] Preferably, the embedded component further comprises a limiting member fixedly provided on the core rod, wherein the limiting member abuts against a side surface of the small diameter portion away from the large diameter portion.

[0012] Preferably, the diameter of the core rod located in the large-diameter portion is greater than or equal to the diameter of the core rod located in the small-diameter portion.

[0013] Preferably, the screw rod is provided with a prompt portion, and the maximum axial distance between the prompt portion and the anchor head is equal to the axial length of the anchoring sheet and the shear sleeve.

[0014] Preferably, the conical surface of the large diameter portion includes a first inclined surface and a second inclined surface, and the angle between the first inclined surface and the horizontal direction is greater than the angle between the second inclined surface and the horizontal direction;

[0015] The conical surface of the anchor head includes a third inclined surface and a fourth inclined surface. The angle between the third inclined surface and the horizontal direction is greater than or equal to the angle between the first inclined surface and the horizontal direction. The angle between the fourth inclined surface and the horizontal direction is equal to the angle between the second inclined surface and the horizontal direction.

[0016] Preferably, the side surface of the large diameter portion away from the small diameter portion is a plane, and the side surface of the anchor head away from the screw body is a plane or an arc surface.

[0017] Preferably, an inner wall of the small diameter portion away from the large diameter portion is provided with an internal thread, the core rod is provided with an external thread, and the core rod is threadedly connected to the small diameter portion.

[0018] Preferably, the concrete embedded anchor bolt fixing device further comprises a mounting plate and an anchor removal member, wherein the mounting plate can be interference-fitted with the plurality of core rods; the anchor removal member is provided with an external thread, and the anchor removal member is threadedly connected to the small-diameter portion.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The above technical solution provides a concrete pre-embedded anchor bolt fixing device, which first sets the embedded component at the specified position and then casts the concrete component. After the concrete component is cast, the core rod is first taken out and then the outer sleeve is taken out. The concrete component can be formed with connected tapered holes and diameter holes. Then the screw, anchor plate and shear sleeve are inserted into the tapered hole and diameter hole, and the anchor plate is pushed by the shear sleeve so that the open plate expands along the direction of the anchor head, thereby fixing the screw, thereby realizing the installation of the remaining equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic cross-sectional view of the assembly of the embedded component provided in an embodiment of the present invention;

[0022] Figure 2 An exploded cross-sectional diagram of an embedded component provided in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the assembly of a fixing assembly provided in an embodiment of the present invention;

[0024] Figure 4 An exploded schematic diagram of a fixing assembly provided in an embodiment of the present invention;

[0025] Figure 5 A schematic cross-sectional view of the assembly of an outer sleeve, a core rod, a mounting plate, and a concrete component provided in an embodiment of the present invention;

[0026] Figure 6 A schematic cross-sectional view of a mandrel after being removed from an outer sleeve according to an embodiment of the present invention;

[0027] Figure 7 A schematic cross-sectional view of fixing an anchor member to an outer sleeve according to an embodiment of the present invention;

[0028] Figure 8 A cross-sectional schematic diagram of removing an anchor member from an outer sleeve according to an embodiment of the present invention;

[0029] Figure 9 A schematic cross-sectional view of the assembly of a portion of a fixing assembly and a concrete component provided by an embodiment of the present invention;

[0030] Figure 10 Another cross-sectional schematic diagram of the assembly of a portion of the fixing assembly and a concrete component provided by an embodiment of the present invention;

[0031] Figure 11 A schematic cross-sectional view of an outer sleeve and a screw provided in another embodiment of the present invention.

[0032] 1. Embedded component; 11. Outer sleeve; 111. Large diameter part; 112. Small diameter part; 113. Installation cavity; 114. First inclined surface; 115. Second inclined surface; 12. Core rod; 13. Limiting piece; 2. Fixing component; 21. Screw; 211. Anchor head; 212. Screw body; 213. Prompt part; 214. Third inclined surface; 215. Fourth inclined surface; 22. Anchor plate; 221. Opening plate; 23. Shear sleeve; 24. Installation sleeve; 25. Gasket; 26. Nut; 3. Installation plate; 4. Remove anchor; 5. Concrete component; 51. Tapered hole; 52. Diameter hole. DETAILED DESCRIPTION

[0033] The present invention will be described in more detail below with reference to the accompanying drawings. It should be noted that the description of the present invention with reference to the accompanying drawings is merely illustrative and non-limiting. Various embodiments can be combined with each other to form other embodiments not shown in the following description.

[0034] See also Figures 1 to 10 The present invention provides a concrete embedded anchor fixing device, including an embedded component 1, a fixing component 2, a mounting plate 3, and an anchor member 4.

[0035] Specifically, the embedded component 1 includes an outer sleeve 11 and a core rod 12. The outer sleeve 11 has a large diameter portion 111 and a small diameter portion 112. Along the axial direction of the outer sleeve 11, the outer sleeve 11 is provided with an installation cavity 113. Part of the core rod 12 is arranged in the installation cavity 113, and the stiffness of the core rod 12 is greater than the stiffness of the outer sleeve 11; the fixing component 2 includes a screw 21, and an anchor plate 22 and a shear sleeve 23 arranged outside the screw 21. The screw 21 includes an anchor head 211. The anchor plate 22 is provided with a plurality of circumferentially spaced open plates 221 on one side close to the anchor head 211, and the shear sleeve 23 can abut against the anchor plate 22.

[0036] The present embodiment provides a concrete pre-embedded anchor fixing device, which first sets the pre-embedded component 1 at a specified position, and then casts the concrete component 5. After the concrete component 5 is cast, the core rod 12 is first removed, and then the outer sleeve 11 is removed, and the concrete component 5 can be formed with a connected tapered hole 51 and a diameter hole 52. Then, the screw 21, the anchor plate 22, and the shear sleeve 23 are inserted into the tapered hole 51 and the diameter hole 52, and the anchor plate 22 is pushed by the shear sleeve 23, so that the open plate 221 expands along the direction of the anchor head 211, thereby fixing the screw 21, thereby realizing the installation of the remaining equipment.

[0037] It can be imagined that the large diameter portion 111 and the small diameter portion 112 are integrally formed, and the mounting cavity 113 can axially penetrate the large diameter portion 111 and the small diameter portion 112. At this time, after the core rod 12 is inserted into the mounting cavity 113, the end of the core rod 12 needs to be flush with the end face of the large diameter portion 111 away from the small diameter portion 112; of course, the mounting cavity 113 can also axially penetrate the small diameter portion 112 and partially penetrate the large diameter portion 111. At this time, the core rod 12 is inserted into the mounting cavity 113, and the end of the core rod 12 can abut against the bottom surface of the mounting cavity 113.

[0038] Furthermore, after the concrete member 5 has hardened, the core rod 12 can be directly removed from the outer sleeve 11. Because the outer sleeve 11 has a large-diameter portion 111, which is larger than the small-diameter portion 112, the large-diameter portion 111 needs to deform when the outer sleeve 11 is removed. Therefore, the outer sleeve 11 needs to be made of a deformable material that will not adhere to the concrete member 5. In this embodiment, the outer sleeve 11 is made of rubber or elastic plastic.

[0039] Since the outer sleeve 11 can be deformed, when concrete is poured outside the outer sleeve 11, the concrete will exert pressure on the outer sleeve 11, causing the outer sleeve 11 to be squeezed and deformed inward. Therefore, the stiffness of the core rod 12 needs to be greater than the stiffness of the outer sleeve 11. The core rod 12 supports the outer sleeve 11, thereby reducing or even avoiding the inward squeezing deformation of the outer sleeve 11.

[0040] The outer diameter of the large diameter portion 111 gradually increases as it moves away from the small diameter portion 112. Specifically, the large diameter portion 111 may be truncated cone-shaped with a conical outer surface. When the outer sleeve 11 is removed, the outer surface of the large diameter portion 111 may be squeezed against the concrete member 5, thereby deforming. The deformed large diameter portion 111 may then move outward along the diameter hole 52 until it is completely removed.

[0041] The screw 21 also includes a screw body 212 integrally formed with the anchor head 211. The outer diameter of the anchor head 211 gradually increases as it moves away from the screw body 212. Specifically, the anchor head 211 may also be truncated cone-shaped as a whole, with a conical outer surface. It should be noted that the maximum outer diameter of the anchor head 211 is less than or equal to the outer diameter of the minor diameter portion 112. In this embodiment, the maximum outer diameter of the anchor head 211 is equal to the outer diameter of the minor diameter portion 112, that is, the maximum outer diameter of the anchor head 211 is equal to the diameter of the diameter hole 32. In this case, the anchor head 211 can just pass through the diameter hole 32 and be inserted into the tapered hole 51.

[0042] The inner wall of the small diameter portion 112 away from the large diameter portion 111 is provided with an internal thread, and the core rod 12 is provided with an external thread, and the core rod 12 is threadedly connected to the small diameter portion 112. Therefore, the core rod 12 and the outer sleeve 11 can be installed and removed by rotating, which is relatively simple and convenient.

[0043] In order to prevent the core rod 12 from deviating from the installation position, the embedded component 1 also includes a limiter 13 fixedly arranged on the core rod 12. The limiter 13 abuts against the side of the small diameter portion 112 away from the large diameter portion 111. The abutment indicates that the core rod 12 has been installed in the correct position.

[0044] Specifically, the limiting member 13 may be annular, that is, the limiting member 13 can form an annular abutment with the small diameter portion 112. It is conceivable that when the concrete component 5 is actually cast, the embedded component 1 can be arranged in a vertical direction, with the large diameter portion 111 of the outer sleeve 11 facing downward. At this time, when the concrete is cast, the liquid level of the concrete gradually rises until the liquid level of the concrete is flush with the end surface of the small diameter portion 112 away from the large diameter portion 111. However, in actual work, the control of the liquid level of the concrete may deviate. For example, the liquid level of the concrete may be slightly higher than the end surface of the small diameter portion 112 away from the large diameter portion 111. The annular abutment of the limiting member 13 with the small diameter portion 112 can reduce or even prevent the concrete from flowing into the gap between the core rod 12 and the inner wall of the small diameter portion 112.

[0045] More specifically, the outer diameter of the limiter 13 may be larger than the outer diameter of the small-diameter portion 112. At this time, if the concrete liquid level is slightly higher than the end face of the small-diameter portion 112 away from the large-diameter portion 111, a cylindrical hole 52 with a larger diameter will also be formed on the outside of the limiter 13. However, the cylindrical hole 52 with a larger diameter will not affect the tapered hole 51 and the smaller diameter hole 52 formed by the outer sleeve 11, that is, it will not affect the normal installation of the fixing assembly 2.

[0046] The diameter of the core rod 12 located in the large-diameter portion 111 is equal to or greater than the diameter of the core rod 12 located in the small-diameter portion 112 .

[0047] It should be clear that the radial thickness of the large diameter portion 111 will be greater than the radial thickness of the small diameter portion 112, and the outer sleeve 11 is made of a deformable material. That is to say, under the extrusion of concrete, the degree of extrusion deformation of the large diameter portion 111 will be greater than the degree of extrusion deformation of the small diameter portion 112. In order to reduce the extrusion deformation of the large diameter portion 111, the diameter of the core rod 12 located in the large diameter portion 111 can be expanded. The core rod 12 with a larger diameter can provide better support for the large diameter portion 111.

[0048] Specifically, in this embodiment, the mounting cavity 113 may be cylindrical with a constant diameter. The diameter of the mandrel 12 located in the small-diameter portion 112 may be equal to or slightly larger than the diameter of the mounting cavity 113, and the diameter of the mandrel 12 located in the large-diameter portion 111 may be slightly larger than the diameter of the mounting cavity 113. In addition, because the outer sleeve 11 is deformable, the mandrel 12 can be smoothly inserted into the mounting cavity 113 even if the diameter of the mandrel 12 is slightly larger than the diameter of the mounting cavity 113.

[0049] The side surface of the large diameter portion 111 away from the small diameter portion 112 is a plane, and the side surface of the anchor head 211 away from the screw body 212 is a plane or an arc surface.

[0050] In this embodiment, since the side of the large diameter portion 111 away from the small diameter portion 112 is a plane, the bottom surface of the tapered hole 51 is formed to be a plane. At this time, if the side of the anchor head 211 away from the screw body 212 is a plane, the anchor head 211 can achieve surface contact with the bottom surface of the tapered hole 51, thereby greatly enhancing the stability of the installation of the fixing component 2; if the side of the anchor head 211 away from the screw body 212 is an arc surface, the curvature of the arc surface is small, the contact area between the anchor head 211 and the bottom surface of the tapered hole 51 will be small, and the anchor head 2 There is a small gap between the edge of 11 and the bottom surface of the tapered hole 51, but it should be clear that when the opening piece 221 is squeezed and expanded by the anchor head 211, the opening piece 221 will also exert inward pressure on the anchor head 211, which may cause the anchor head 211 to be squeezed and deformed, and the anchor head 211 will protrude axially. The gap between the edge of the anchor head 211 and the bottom surface of the tapered hole 51 can accommodate the protruding part, preventing the protruding part from directly colliding with the bottom surface of the tapered hole 51, thereby squeezing the fixing component 2 outward and affecting the installation stability of the fixing component 2.

[0051] It should be clear that the maximum outer diameter of the anchor head 211 is not greater than the diameter of the diameter hole 52, and the farther the tapered hole 51 is from the diameter hole 52, the larger the diameter of the tapered hole 51. Therefore, when the anchor head 211 is inserted into the tapered hole 51, the distance between the anchor head 211 and the tapered surface of the tapered hole 51 increases in the direction away from the diameter hole 52. In order for the opening piece 221 to fill the gap between the anchor head 211 and the tapered hole 51, the radial thickness of the opening piece 221 needs to gradually increase in the direction close to the anchor head 211.

[0052] The mounting plate 3 may be provided with a plurality of mounting holes, which may be interference-fitted with the core rod 12, thereby securing the core rod 12. Before pouring the concrete component 5, the embedded component 1 may be first mounted on the mounting plate 3, and the mounting plate 3 may be fixed to a designated position using other equipment before pouring the concrete component 5.

[0053] The screw 21 is provided with a guide portion 213. The distance between the guide portion 213 and the bottom surface of the tapered hole 51 is equal to the axial length of the anchor plate 22 and the shear sleeve 23. It should be noted that the length of the anchor plate 22 in this case refers to the axial length of the anchor plate 22 after the opening 221 is expanded. In this embodiment, the guide portion 213 can be a red line.

[0054] In addition, when the screw 21, the anchor plate 22, and part of the shear sleeve 23 are inserted into the tapered hole 51 and the diameter hole 52, only part of the shear sleeve 23 is exposed. Therefore, in order to facilitate the knocking of the shear sleeve 23, an installation sleeve 24 can be further sleeved on the outside of the screw 21. The installation sleeve 24 can abut against the shear sleeve 23, and the external equipment can knock the shear sleeve 23 by knocking the installation sleeve 24.

[0055] After the concrete component 5 is poured, the core rod 12 can be rotated to separate the core rod 12 from the outer sleeve 11, thereby allowing the core rod 12 to be removed. At this time, since the outer sleeve 11 is entirely located inside the concrete component 5, in order to facilitate the removal of the outer sleeve 11, the removal anchor 4 can be provided with an external thread. Rotating the removal anchor 4 can threadably connect the removal anchor 4 to the outer sleeve 11. At this time, pulling the removal anchor 4 outward can remove the outer sleeve 11.

[0056] In summary, the working steps of the concrete pre-embedded anchor bolt fixing device provided in this embodiment are: Figure 5 First, fix the embedded component 1 on the installation plate 3. The installation plate 3 can be transported to the designated location through external equipment. Then start pouring the concrete component 5. After the concrete component 5 hardens, refer to Figure 6 , remove the mounting plate 3, then rotate and remove the core rod 12. Figure 7 , by rotating the anchor 4 so that the anchor 4 is threadedly connected to the outer sleeve 11, see Figure 8, pull out the anchor 4 and remove the outer sleeve 11, at this time the concrete component 5 is formed with a connected tapered hole 51 and a diameter hole 52. Figure 9 , insert the screw 21, anchor plate 22, and part of the shear sleeve 23 into the tapered hole 51 and the diameter hole 52. The external device can hit the shear sleeve 23 through the installation sleeve 24, and the shear sleeve 23 can hit the anchor plate 22. Figure 10 The open piece 221 expands under the action of the anchor head 211. When the staff can see the prompt portion 213, they know that the anchor piece 22 and the shear sleeve 23 are installed in place. At this time, the expanded open piece 221 can fill the gap between the anchor head 211 and the tapered hole 51, thereby fixing the screw 21. At this time, the shear sleeve 23 can also fill the gap between the screw body 212 and the diameter hole 52, thereby further enhancing the stability of the screw 21. Finally, external equipment can be installed on the screw 21 and fixed with washers 25, nuts 26, etc.

[0057] See also Figure 11 In other embodiments, in order to further enhance the stability of the screw 21, the conical surface of the large diameter portion 111 includes a first inclined surface 114 and a second inclined surface 115, and the angle between the first inclined surface 114 and the horizontal direction is greater than the angle between the second inclined surface 115 and the horizontal direction; the conical surface of the anchor head 211 includes a third inclined surface 214 and a fourth inclined surface 215, and the angle between the third inclined surface 214 and the horizontal direction is greater than or equal to the angle between the first inclined surface 114 and the horizontal direction, and the angle between the fourth inclined surface 215 and the horizontal direction is equal to the angle between the second inclined surface 115 and the horizontal direction.

[0058] At this time, after the opening piece 221 expands along the third inclined surface 214 and the fourth inclined surface 215, the opening piece 221 will have two expanded portions with different angles, and the expanded portion located between the first inclined surface 114 and the third inclined surface 214 can provide a greater force to prevent the screw 21 from moving outward.

[0059] Furthermore, the angle between the third inclined surface 214 and the horizontal direction can be greater than the angle between the first inclined surface 114 and the horizontal direction because the maximum outer diameter of the anchor head 211 is not greater than the diameter of the diameter hole 52, and the farther the tapered hole 51 is from the diameter hole 52, the larger the diameter of the tapered hole 51. Therefore, when the anchor head 211 is inserted into the tapered hole 51, the distance between the anchor head 211 and the tapered surface of the tapered hole 51 increases in the direction away from the diameter hole 52. A larger angle between the third inclined surface 214 and the horizontal direction can reduce the gap between the third inclined surface 214 and the tapered surface of the tapered hole 51, thereby allowing the open piece 221 to more easily fill the gap between the anchor head 211 and the tapered hole 51.

[0060] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A concrete embedded anchor fixing device, characterized in that: include: An embedded component (1) comprises an outer sleeve (11) and a core rod (12), wherein the outer sleeve (11) has a large diameter portion (111) and a small diameter portion (112), and along the axial direction of the outer sleeve (11), the outer sleeve (11) is provided with a mounting cavity (113), a portion of the core rod (12) is disposed in the mounting cavity (113), and the rigidity of the core rod (12) is greater than the rigidity of the outer sleeve (11); A fixing assembly (2) comprises a screw rod (21), an anchoring plate (22) and a shear sleeve (23) sleeved outside the screw rod (21), wherein the screw rod (21) comprises an anchor head (211), a side of the anchoring plate (22) close to the anchor head (211) is provided with a plurality of circumferentially spaced open plates (221), and the shear sleeve (23) is capable of abutting against the anchoring plate (22).

2. The concrete pre-buried anchor fixing device according to claim 1, characterized in that: The outer diameter of the large diameter portion (111) gradually increases in a direction away from the small diameter portion (112); The screw (21) further comprises a screw body (212) integrally formed with the anchor head (211), and the outer diameter of the anchor head (211) gradually increases in a direction away from the screw body (212); The maximum outer diameter of the anchor head (211) is smaller than or equal to the outer diameter of the small diameter portion (112).

3. The concrete pre-buried anchor fixing device according to claim 1, characterized in that: Along the direction approaching the anchor head (211), the radial thickness of the opening piece (221) gradually increases.

4. The concrete pre-buried anchor fixing device according to claim 1, characterized in that: The embedded component (1) further comprises a limiting member (13) fixedly arranged on the core rod (12), wherein the limiting member (13) abuts against a side surface of the small diameter portion (112) away from the large diameter portion (111).

5. The concrete pre-buried anchor fixing device according to claim 1, characterized in that: The diameter of the core rod (12) located in the large-diameter portion (111) is greater than or equal to the diameter of the core rod (12) located in the small-diameter portion (112).

6. The concrete pre-buried anchor fixing device according to claim 1, characterized in that: The screw rod (21) is provided with a prompt portion (213), and the maximum axial distance between the prompt portion (213) and the anchor head (211) is equal to the axial length of the anchoring sheet (22) and the shear sleeve (23).

7. The concrete pre-buried anchor fixing device according to claim 1, characterized in that: The conical surface of the large diameter portion (111) includes a first inclined surface (114) and a second inclined surface (115), and the angle between the first inclined surface (114) and the horizontal direction is greater than the angle between the second inclined surface (115) and the horizontal direction; The conical surface of the anchor head (211) includes a third inclined surface (214) and a fourth inclined surface (215), wherein the angle between the third inclined surface (214) and the horizontal direction is greater than or equal to the angle between the first inclined surface (114) and the horizontal direction, and the angle between the fourth inclined surface (215) and the horizontal direction is equal to the angle between the second inclined surface (115) and the horizontal direction.

8. The concrete pre-buried anchor fixing device according to claim 2, characterized in that: The side surface of the large diameter portion (111) away from the small diameter portion (112) is a plane, and the side surface of the anchor head (211) away from the screw body (212) is a plane or an arc surface.

9. The concrete pre-buried anchor fixing device according to claim 1, characterized in that: An inner wall of the small diameter portion (112) away from the large diameter portion (111) is provided with an internal thread, the core rod (12) is provided with an external thread, and the core rod (12) is threadedly connected to the small diameter portion (112).

10. The concrete pre-buried anchor fixing device according to claim 1, characterized in that: The concrete pre-embedded anchor bolt fixing device further comprises a mounting plate (3) and an anchor removal member (4); the mounting plate (3) is capable of interference fit with the plurality of core rods (12); the anchor removal member (4) is provided with an external thread, and the anchor removal member (4) is threadedly connected to the small-diameter portion (112).

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