CN220540050U - Shield bottom-expanding hole anchor bolt - Google Patents

Abstract

The utility model discloses a shield bottom-expanding hole anchor bolt, which comprises a screw rod, an expansion lock key and a sleeve, wherein an expansion cone head is arranged at one end of the screw rod, the expansion lock key and the sleeve are movably sleeved on the screw rod, the expansion lock key is positioned at one end of the screw rod, which is provided with the expansion cone head, and comprises a plurality of expansion sheets which are arranged at intervals, and the expansion lock key axially displaces along the expansion cone head to enable the expansion sheets to radially expand along the expansion cone head; an open slot is formed between two adjacent expansion sheets on the expansion lock key, a convex edge is arranged on the periphery of the expansion cone head at a position corresponding to the open slot, the convex edge extends along the axial direction of the expansion cone head, the convex edge slides into the open slot so as to limit the circumferential relative rotation of the expansion cone head and the expansion lock key, a cutting part is formed at the end part of each expansion sheet, and when the screw rotates, the sleeve and the expansion lock key are driven to synchronously rotate, so that the cutting part on the expansion sheet cuts a substrate. The anchor bolt has high stability, is not easy to loosen, is installed and formed once, and has low installation cost.

Description

Shield bottom-expanding hole anchor bolt

Technical Field

The utility model relates to the technical field of expanded bottom anchor bolts, in particular to a shield expanded bottom hole anchor bolt.

Background

The expansion anchor bolt is one assembly with conic body and expansion sheet to expand and produce expansion extrusion force with the wall of the anchor hole and to produce pulling resistance via friction to realize the anchoring of the connected part.

The existing expansion anchor bolt has the following defects;

1. stability is poor: the existing expansion anchor bolt is fixed only through expansion extrusion force and friction force of the expansion sheet and the wall of the anchor hole of the base material, the anchored object is affected by load to vibrate for a long time, the wall of the hole is enlarged, extrusion force and friction force of the expansion sheet and the wall of the hole are reduced, extrusion force is even lost, the anchor bolt is loosened, even the anchor bolt is separated from the anchor hole, and the fixing effect on the object is lost.

2. The installation cost is high: in the existing expansion anchor bolt installation process, a plurality of parts are needed, if the expansion anchor bolt is a post expansion anchor bolt, a straight hole drill bit and a reaming drill bit are needed to be used for secondary punching during installation, the installation process is complex, and the installation cost is high.

Disclosure of Invention

The utility model aims to provide a shield bottom-expanding hole anchor bolt which is high in stability, not easy to loosen, low in installation cost and capable of being installed and formed once.

To achieve the above object, the solution of the present utility model is: the shield bottom-expanding hole anchor bolt comprises a screw rod, an expansion lock key and a sleeve, wherein an expansion cone head is arranged at one end of the screw rod, the expansion lock key and the sleeve are movably sleeved on the screw rod, the expansion lock key is positioned at one end of the screw rod, which is provided with the expansion cone head, and comprises a plurality of expansion sheets which are arranged at intervals, and the expansion lock key axially displaces along the expansion cone head to enable the expansion sheets to radially expand along the expansion cone head;

the expansion lock key is characterized in that an open slot is formed between two adjacent expansion sheets on the expansion lock key, a convex edge is arranged on the periphery of the expansion cone head at a position corresponding to the open slot, the convex edge extends along the axial direction of the expansion cone head, the convex edge slides into the open slot so as to limit the circumferential relative rotation of the expansion cone head and the expansion lock key, a cutting part is formed at the end part of the expansion sheet, the screw rod rotates to drive the sleeve and the expansion lock key to synchronously rotate, the cutting part on the expansion sheet is used for cutting a substrate to form an effective shield bottom expanding hole, and at the moment, the opening part of the expansion lock key and the shield bottom expanding hole realize a bearing structure with stable mechanical lock key.

Further, the expansion lock key further comprises a lock key ring, the expansion piece extends on the lock key ring, the sleeve and the expansion lock key axially displace along the screw rod, and then the expansion piece radially expands along the expansion cone head.

Further, an expansion main inclined plane for radial expansion of the expansion sheet is formed between two adjacent convex edges on the expansion cone head, and an expansion auxiliary inclined plane for expansion of the inner wall of the locking key ring is formed on the surface of each convex edge.

Further, a U-shaped groove is formed in the concave portion of one end, connected with the locking key ring, of the expansion piece.

Further, the number of the expansion sheets is four, the number of the formed open grooves is four, the number of the convex edges on the expansion cone head is four, and each convex edge is correspondingly embedded into one open groove so as to limit the circumferential relative rotation of the expansion cone head and the expansion locking key.

Further, one end of the screw rod, which is not provided with the expansion cone head, is provided with a connecting part for connecting an external tool.

Further, the connecting portion is an outer hexagonal column.

Further, the external tool comprises a hollow drill handle and an elastic limiting assembly arranged in the hollow drill handle, wherein the hollow drill handle is abutted with the end part of the sleeve and used for pressing the sleeve into the anchor hole; the elastic component is used for driving the screw rod to rotate and limiting the axial displacement of the screw rod.

Further, the elastic component includes first interior hexagonal pipe, second interior hexagonal pipe, pressure spring and hexagonal stick, and first interior hexagonal pipe is fixed in the hollow drill shank, second interior hexagonal pipe activity sets up in the hollow drill shank, through pressure spring elastic connection between first interior hexagonal pipe and the second interior hexagonal pipe, hexagonal stick wears to put in first interior hexagonal pipe, second interior hexagonal pipe and pressure spring.

After the scheme is adopted, the beneficial effects of the utility model are as follows:

1. stability is high: the shield bottom-expanding hole anchor bolt comprises a screw rod, an expansion locking key and a sleeve, wherein an expansion conical head is arranged at one end of the screw rod, the expansion locking key and the sleeve are movably sleeved on the screw rod, the expansion locking key comprises a plurality of expansion sheets which are arranged at intervals, and the expansion locking key axially displaces along the expansion conical head to enable the expansion sheets to radially expand along the expansion conical head; form the open slot on the expansion latch between two adjacent expansion sheets, the periphery of expansion cone head is equipped with the bead in the position corresponding with the open slot, and the bead cooperates with the open slot to restrict the relative rotation in circumference of expansion cone head and expansion latch, the tip of expansion sheet is formed with cutting part, drives sleeve and expansion latch synchronous rotation when the screw rod is rotatory, and the expansion sheet also rotates in cutting embedding substrate base member when the inflation, forms reliable mechanical latch bearing structure for the crab-bolt is radial and axial all to realize firm installation, difficult not hard up, is difficult for deviating from in the anchor eye more, and stability is high.

2. The one-time installation molding and the installation cost is low: the expansion locking key is embedded into the substrate matrix while cutting the substrate, so that installation and fixation are realized, and an independent secondary reaming tool is not needed, so that the installation procedure is simple, and the installation cost is effectively reduced.

Drawings

FIG. 1 is a schematic view of the components of an anchor according to one embodiment of the present utility model;

FIG. 2 is a schematic view of the components of an anchor according to one embodiment of the present utility model;

FIG. 3 is a schematic diagram of an embodiment of an external tooling structure;

FIG. 4 is a schematic illustration of an anchor bolt installation condition in accordance with an embodiment of the present utility model;

FIG. 5 is a schematic illustration II of an anchor bolt installation condition in accordance with an embodiment of the present utility model;

FIG. 6 is a schematic view of an anchor bolt installation condition III according to an embodiment of the present utility model;

FIG. 7 is a schematic view of an anchor bolt installation condition according to an embodiment of the present utility model;

fig. 8 is a schematic view showing an anchor bolt installation state according to an embodiment of the present utility model.

Description of the reference numerals:

1. a screw; 2. an expansion cone head; 21. a rib; 22. expanding the main inclined plane; 23. an expansion pair inclined plane; 3. a sleeve; 4. an expansion key; 41. a key ring; 42. an expansion sheet; 421. a cutting portion; 43. an open slot; 44. a U-shaped groove;

5. a hollow drill shank; 6. a first inner hexagonal tube; 7. a second inner hexagonal tube; 8. a pressure spring; 9. a hexagonal rod; 10. a connection part; 11. an anchor hole; 12. a substrate.

Detailed Description

The utility model will be described in detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a shield expanded bottom hole anchor bolt, which comprises a screw rod 1, an expansion lock key 4 and a sleeve 3, wherein one end of the screw rod 1 is provided with an expansion conical head 2, the expansion lock key 4 and the sleeve 3 are movably sleeved on the screw rod 1, the expansion lock key 4 and the sleeve 3 can be integrated or separated, and the expansion lock key 4 and the sleeve 3 can be relatively fixed and synchronously transmit displacement and rotation force. The number of the sleeves 3 can be one, and the number of the sleeves 3 can be added at will according to the length and the installation depth of the screw 1 so as to adapt to the installation scene. The expansion locking key 4 is located at one end of the screw 1, where the expansion conical head 2 is located, the expansion locking key 4 includes a plurality of expansion pieces 42 that are arranged at intervals, the expansion locking key 4 axially displaces along the expansion conical head 2, so that the expansion pieces 42 radially expand along the expansion conical head 2, and friction and extrusion are formed between the expansion pieces and the inner wall of the anchor hole 11.

The scheme is characterized in that: as shown in fig. 1 and 2, an open slot 43 is formed between two adjacent expansion tabs 42 on the expansion lock key 4, a rib 21 is provided on the outer periphery of the expansion cone head 2 at a position corresponding to the open slot 43, the rib 21 extends axially along the expansion cone head 2, the rib 21 slides into the open slot 43 to limit the circumferential relative rotation of the expansion cone head 2 and the expansion lock key 4, a cutting portion 421 is formed at the end of the expansion tab 42, the sleeve 3 and the expansion lock key 4 are driven to synchronously rotate when the screw 1 rotates, the expansion tab 42 rotates while expanding, so that the cutting portion 421 on the expansion tab performs shield-enlarging cutting on the substrate 12 inside the anchor hole 11 to form an effective shield-enlarging hole, and at this time, the opening portion of the expansion lock key 4 and the shield-enlarging hole realize a stable bearing structure of the mechanical lock key.

The cutting portion 421 may have any shape capable of cutting the substrate 12, and preferably, the cutting portion 421 has a tapered cross section, and has a good cutting effect on the substrate 12.

It should be noted that, the above-mentioned open slot 43 is used as the first limit portion, the rib 21 is used as the second limit portion, the first limit portion and the second limit portion cooperate to limit the circumferential relative rotation of the expansion cone head 2 and the expansion lock key 4, but the first limit portion is not limited to the open slot 43, may be a chute or the like, and the second limit portion is not limited to the rib 21, may be a limit structure such as a protrusion or a bump, and can satisfy that when the screw 1 rotates, the sleeve 3 and the expansion lock key 4 are driven to rotate synchronously.

The number of the expansion pieces 42 on the expansion lock key 4 is not limited, and can be determined according to the type of the anchor bolt and the production requirement, preferably, the number of the expansion pieces 42 on the expansion lock key 4 is four, therefore, the number of the formed open slots 43 is four, the number of the convex ribs 21 on the expansion cone head 2 is correspondingly four, and each convex rib 21 is correspondingly embedded into one open slot 43 so as to limit the circumferential relative rotation of the expansion cone head 2 and the expansion lock key 4. Of course, when the number of the expansion pieces 42 is four and the number of the open grooves 43 is four, the number of the ribs 21 is not necessarily four, but may be two or three, and four ribs are arranged in one-to-one correspondence with the open grooves 43, so that the stress is more uniform and the stability is better.

As shown in fig. 1, the expansion key 4 further includes a key ring 41, the key ring 41 is extended with the expansion piece 42, the key ring 41 is fixedly connected with the sleeve 3, the external tool drives the sleeve 3 and the expansion key 4 to axially displace along the screw 1, and then the expansion piece 42 radially expands along the expansion cone head 2. The expansion piece 42 is formed with a U-shaped groove 44 in a concave manner at the end connected with the locking key ring 41.

As shown in fig. 1 and 2, an expansion main inclined plane 22 for radial expansion of the expansion sheet 42 is formed between two adjacent ribs on the expansion cone head 2, and an expansion auxiliary inclined plane 23 for expansion of the inner wall of the lock key ring 41 is formed on the surface of the rib 21. When the expansion locking key 4 and the expansion cone head 2 are relatively displaced, the expansion piece 42 is contacted with the expansion main inclined plane 22, so that the expansion piece 42 is forced to radially expand; simultaneously, the inner wall of the lock key ring 41 is contacted with the expansion auxiliary inclined plane 23, and when the lock key ring 41 is further contacted, the expansion auxiliary inclined plane 23 forces the diameter of the lock key ring 41 to gradually increase until the outer surface of the lock key ring 41 and the wall of the anchor hole generate enough positive pressure, namely, friction force resisting the load capacity is generated. It follows that the sum of the load resisting capacity of the expansion key 4 is the friction of the load resisting capacity of the expansion key 4 and the load resisting capacity of the key ring 41.

In the process of installing the anchor bolt, the rotation of the screw 1 and the displacement of the sleeve 3 need to be driven by external force such as an external tool, so that the end of the screw 1, which is not provided with the expansion cone head 2, is provided with a connecting part 10 for connecting with the external tool, and the connecting part 10 is a solid outer hexagonal column (as shown in fig. 1), and can be in any shape.

The external tool used for installation only has the functions of driving the screw 1 to rotate and driving the sleeve 3 and the expansion lock key 4 to displace, and this embodiment enumerates an external tool corresponding to the above-mentioned outer hexagonal pillar connecting portion 10, as shown in fig. 3, and the specific structure is as follows: the external tool comprises a hollow drill shank 5 and an elastic limiting assembly arranged in the hollow drill shank 5, wherein the hollow drill shank 5 is abutted with the end part of the sleeve 3 and used for pressing the sleeve 3 into the anchor hole 11; the elastic component is used for driving the screw 1 to rotate and limiting the axial displacement of the screw 1.

The elastic component includes six in first 6, six in the second pipe, pressure spring 8 and hexagonal stick 9, and six in first pipe 6 is fixed in the hollow drill shank 5, six in the second pipe 7 activity sets up in the hollow drill shank 5, and six in first pipe 6 and the second are through pressure spring 8 elastic connection in between six in the pipe 7, and six in the fixed setting of one end of stick 9 in the second is intraductal, and the other end activity wears to put in pressure spring 8 and six in first pipe 6, six in the outer posts of screw rod 1 and six in first pipe 6, the second pipe 7 looks adaptation. The hollow drill shank 5 is sleeved on the periphery of the screw rod 1, so that the solid part of the periphery of the hollow drill shank 5 is abutted with the end part of the sleeve 3, meanwhile, the outer hexagonal column of the screw rod 1 is sleeved with the second inner hexagonal tube 7, the relative rotation of the screw rod 1 and the second inner hexagonal tube 7 is limited, meanwhile, the end part of the outer hexagonal column of the screw rod 1 is abutted with the hexagonal rod 9, the drill shank is rotated and pressed in, the bottom expanding sleeve is pressed in the anchor hole 11, and meanwhile, the screw rod 1 is driven to rotate.

The installation method of the shield bottom-expanding hole anchor bolt in the scheme is as follows:

fig. 5 to 8 are schematic views showing the installation state of the shield bottom-expanding anchor, and the installation sequence is from fig. 5 to 8.

S1: the anchor holes 11 are drilled, firstly, a conventional impact drill is used for drilling holes according to the specification and the model of a shield-expanded bottom anchor bolt to be installed, and the diameter and the depth of the drilled holes are determined;

s2: sleeving the expansion lock key 4 and the sleeve 3 on the screw 1, then simultaneously placing the expansion lock key 4, the sleeve 3 and the screw 1 into the drilled anchor hole 11, and moving into place;

s3: connecting an external tool, namely connecting the external tool with the connecting part 10 of the screw 1, and enabling the external tool to be in butt joint with the end part of the sleeve 3;

s4: starting an external tool, pressing the sleeve 3 and the expansion locking key 4 into the anchor hole 11, driving the screw 1 to rotate, driving the expansion locking key 4 and the sleeve 3 to synchronously rotate through the limit of the convex edge 21 and the open slot 43 while the screw 1 rotates, and cutting the side wall of the anchor hole 11 to cut into the substrate 12 of the side wall of the anchor hole 11 while the expansion piece 42 expands along the expansion cone head 2;

s5: when the external fixture presses the sleeve 3 into the anchor hole 11 completely, the external fixture stops working and withdraws from the screw 1, and the anchor bolt is installed.

For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present utility model. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

Meanwhile, the directions of front, rear, left, right, etc. in this embodiment are merely references to one direction, and do not represent directions in actual use. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above embodiments are only preferred embodiments of the present utility model, and are not limited to the present utility model, and all equivalent changes made according to the design key of the present utility model fall within the protection scope of the present utility model.

Claims (9)

1. A shield expands bottom hole crab-bolt which characterized in that: the expansion lock key comprises a plurality of expansion pieces which are arranged at intervals, and the expansion lock key axially displaces along the expansion cone head to enable the expansion pieces to radially expand along the expansion cone head;

an open slot is formed between two adjacent expansion sheets on the expansion lock key, a convex edge is arranged on the periphery of the expansion cone head at a position corresponding to the open slot, the convex edge extends along the axial direction of the expansion cone head, the convex edge slides into the open slot so as to limit the circumferential relative rotation of the expansion cone head and the expansion lock key, a cutting part is formed at the end part of each expansion sheet, and when the screw rotates, the sleeve and the expansion lock key are driven to synchronously rotate, so that the cutting part on the expansion sheet cuts a substrate.

2. A shield reaming anchor as claimed in claim 1, wherein: the expansion lock key further comprises a lock key ring, the expansion piece extends on the lock key ring, the sleeve and the expansion lock key axially displace along the screw rod, and then the expansion piece radially expands along the expansion cone head.

3. A shield reaming anchor as claimed in claim 2, wherein: an expansion main inclined plane for radial expansion of the expansion sheet is formed between two adjacent convex edges on the expansion cone head, and an expansion auxiliary inclined plane for inner wall expansion of the locking key ring is formed on the surface of each convex edge.

4. A shield reaming anchor as claimed in claim 2, wherein: and a U-shaped groove is formed in the concave part of one end of the expansion piece, which is connected with the locking key ring.

5. A shield reaming hole anchor as claimed in claim 1 or claim 2, wherein: the number of the expansion sheets is four, the number of the formed open slots is four, the number of the convex ribs on the expansion cone head is four, and each convex rib is correspondingly embedded into one open slot so as to limit the relative rotation of the expansion cone head and the expansion locking key in the circumferential direction.

6. A shield reaming anchor as claimed in claim 1, wherein: one end of the screw rod, which is not provided with the expansion cone head, is provided with a connecting part for connecting an external tool.

7. A shield reaming anchor as defined in claim 6, wherein: the connecting part is an outer hexagonal column.

8. A shield reaming anchor as defined in claim 6, wherein: the external tool comprises a hollow drill handle and an elastic limiting assembly arranged in the hollow drill handle, wherein the hollow drill handle is abutted with the end part of the sleeve and used for pressing the sleeve into the anchor hole; the elastic limiting component is used for driving the screw rod to rotate and limiting the axial displacement of the screw rod.

9. A shield reaming anchor as claimed in claim 8, wherein: the elastic limiting assembly comprises a first inner hexagonal tube, a second inner hexagonal tube, a pressure spring and a hexagonal rod, wherein the first inner hexagonal tube is fixed in the hollow drill handle, the second inner hexagonal tube is movably arranged in the hollow drill handle, one end of the hexagonal rod is fixedly arranged in the second inner hexagonal tube through elastic connection of the pressure spring, the other end of the hexagonal rod is movably arranged in the pressure spring and the first inner hexagonal tube in a penetrating mode, and an outer hexagonal column of the screw rod is matched with inner six sides of the first inner hexagonal tube and the second inner hexagonal tube.