Self-drilling type anchor rod capable of achieving double-rotation-direction drilling and manufacturing process of self-drilling type anchor rod

Abstract

The invention discloses a self-drilling anchor rod capable of achieving double-rotation-direction drilling and a manufacturing process thereof.The self-drilling anchor rod comprises an anchor rod body, and double-rotation-direction threaded sections are arranged at the two ends of the anchor rod body correspondingly; the right-handed threads rotate clockwise along the whole periphery of the two ends of the anchor rod body, the left-handed threads rotate anticlockwise along the whole periphery of the two ends of the anchor rod body, and the right-handed threads and the left-handed threads are machined independently, so that the right-handed threads and the left-handed threads are mutually crossed and overlapped. According to the self-drilling anchor rod, the large-diameter anchor rod and the small-diameter anchor rod can meet the adaptation of anchoring drilling machines with different thread rotating directions without distinguishing left-hand threads and right-hand threads, the universality of the self-drilling anchor rod is achieved, stock management of factories is facilitated, the delivery date of products is shortened, in addition, the self-drilling anchor rod meets the fastening performance of assembly connection, and the service life of the self-drilling anchor rod is prolonged. The stress can be uniformly dispersed and well transmitted, and the anchoring strength can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering equipment, and in particular to a self-drilling anchor rod capable of realizing dual-rotational drilling and a manufacturing process thereof. Background Art

[0002] Self-drilling anchor is a new type of anchoring method, mainly used in loose, broken and complex geological conditions where the hole collapses after drilling. The construction of self-drilling anchor realizes the integration of drilling, grouting and anchoring functions. It has simple construction process, high construction efficiency, good anchoring effect, and no need to worry about the hole collapse problem. It is widely used in tunnel, slope, foundation pit support and other projects. The installation and construction of self-drilling anchor needs to be completed in conjunction with a drilling rig. The drilling efficiency of the drilling rig directly affects the cost of the self-drilling anchor and affects the promotion and use of self-drilling anchors.

[0003] The installation of self-drilling anchors requires drilling equipment. Different drilling rigs are used under different geological conditions. There are three drilling methods for self-drilling anchor drilling rigs: rotary drilling, rotary impact drilling, and impact drilling. The installation of self-drilling anchors requires the use of a drill tail to connect the hollow anchor and the drilling rig. The threads of self-drilling anchors are left-handed and right-handed. Most small-diameter self-drilling hollow anchors use left-handed threads, while large-diameter self-drilling anchors use right-handed threads. However, in actual construction equipment, most anchoring drilling rigs use right-handed threads, which makes it impossible to connect the construction in the middle of the construction due to different thread rotation directions. Most of the small-diameter self-drilling anchors in stock have left-handed threads, and the production cycle of on-site procurement of right-handed threads is long, which cannot meet the customer's delivery requirements. Therefore, self-drilling hollow anchors that can meet both left-handed and right-handed threads are needed to meet construction needs.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a self-drilling anchor rod capable of realizing dual-rotation drilling and a manufacturing process thereof. Specifically, the following technical solutions are adopted:

[0006] A self-drilling anchor rod capable of realizing dual-rotation drilling comprises an anchor rod body, wherein both ends of the anchor rod body respectively have dual-rotation thread sections, wherein the dual-rotation thread sections comprise right-handed threads rotating clockwise along the entire outer circumference of both ends of the anchor rod body and left-handed threads rotating counterclockwise along the entire outer circumference of both ends of the anchor rod body, wherein the right-handed threads and the left-handed threads are independently processed so as to form a cross-overlapping relationship between the right-handed threads and the left-handed threads.

[0007] As an optional embodiment of the present invention, the anchor body includes an intermediate anchor section and a first double-handed thread section and a second double-handed thread section located at two ends of the intermediate anchor section;

[0008] A unidirectional thread is arranged on the outer circumference of the middle anchor bolt section, and the direction of rotation of the unidirectional thread is the same as that of the right-hand thread or the left-hand thread;

[0009] Alternatively, the outer periphery of the middle anchor section is provided with the same double-handed thread as the first double-handed thread section and the second double-handed thread section.

[0010] As an optional embodiment of the present invention, the pitch of the unidirectional thread of the intermediate anchor bolt segment is the same as the pitch of the right-hand thread or the left-hand thread of the first bidirectional thread segment or the second bidirectional thread segment;

[0011] The root tooth profile of the single-handed thread of the middle anchor section is the same as the root tooth profile of the right-handed thread or the left-handed thread of the first double-handed thread section and the second double-handed thread section;

[0012] The crest tooth profile of the single-handed thread of the middle anchor section is the same as the crest tooth profile of the right-handed thread or the left-handed thread of the first double-handed thread section and the second double-handed thread section;

[0013] The tooth depth of the single-handed thread of the middle anchor rod section is equal to the tooth depth of the right-handed thread or the left-handed thread of the first double-handed thread section and the second double-handed thread section.

[0014] As an optional embodiment of the present invention, the first double-handed thread section of the anchor body is threadedly connected to the drill bit, and the second double-handed thread section of the anchor body is threadedly connected to the connecting sleeve, the first double-handed thread section supports the installation of a left-handed internally threaded drill bit and a right-handed internally threaded drill bit, and the second double-handed thread section supports the installation of a left-handed internally threaded connecting sleeve and a right-handed internally threaded connecting sleeve, and the drill bit and the connecting sleeve installed at both ends of the same anchor body have the same hand-handed internal threads;

[0015] Alternatively, the first double-handed threaded section and the second double-handed threaded section of the anchor body are respectively threadedly connected to the connecting sleeve, and the first double-handed threaded section and the second double-handed threaded section support the installation of the left-handed internally threaded connecting sleeve and the right-handed internally threaded connecting sleeve, and the connecting sleeves installed at both ends of the same anchor body have the same hand-handed internal threads;

[0016] Alternatively, the first double-handed thread section of the anchor body is threadedly connected to the connecting sleeve, and the second double-handed thread section of the anchor body is threadedly connected to the drill butt sleeve, the first double-handed thread section supports the installation of a left-handed internally threaded connecting sleeve and a right-handed internally threaded connecting sleeve, and the second double-handed thread section supports the installation of a left-handed internally threaded drill butt sleeve and a right-handed internally threaded drill butt sleeve, and the connecting sleeve and the drill butt sleeve installed at both ends of the same anchor body have the same hand-handed internal thread.

[0017] As an optional embodiment of the present invention, the anchor rod bodies are sequentially connected in series through a connecting sleeve to form a self-drilling anchor rod, a drill bit is installed at one end of the self-drilling anchor rod to drill into the target construction object, and the other end extends out of the target construction object, and the end of the self-drilling anchor rod extending out of the target construction object is erected and fixed by a supporting device;

[0018] A left-handed internal thread nut and a right-handed internal thread nut are simultaneously fastened on the double-handed threaded section at the end of the self-drilling anchor rod and fixedly connected to the supporting device.

[0019] As an optional embodiment of the present invention, the support device includes a support steel frame, a pad and a reinforcing anchor bar, the support steel frame is supported on the outer wall surface of the target construction object, the pad is fixedly mounted on the support steel frame, the reinforcing anchor bar is distributed on the outer periphery of the support steel frame, one end of the reinforcing anchor bar is anchored inside the target construction object, and the other end is fixedly connected to the support steel frame;

[0020] The backing plate is provided with a through hole for the double-handed threaded section at the end of the self-drilling anchor to pass through, and the double-handed threaded section is simultaneously fastened with a left-handed internal threaded nut and a right-handed internal threaded nut to fix the end of the self-drilling anchor to the backing plate;

[0021] Optionally, the self-drilling anchor is drilled into the target construction object at an angle, and a wedge-shaped seamless tube body is sleeved on the double-threaded section at the end of the self-drilling anchor, one end of the wedge-shaped seamless tube body is an inclined surface that fits with the pad, and the other end of the wedge-shaped seamless tube body is a straight surface that fits with the left-handed internal threaded nut or the right-handed internal threaded nut.

[0022] The present invention also provides a process for manufacturing the self-drilling anchor rod, comprising:

[0023] The steel is rolled with axial feed to produce left / right-hand threads on the outer surface of the steel to prepare primary anchor rods;

[0024] The two ends of the primary anchor rod are processed with right / left-hand threads by radial rolling to obtain a self-drilling anchor rod with double-hand thread sections at both ends.

[0025] As an optional embodiment of the present invention, the right / left-handed threads processed by radial rolling at both ends of the primary processed anchor rod have the same thread parameters as the left / right-handed threads on the primary processed anchor rod.

[0026] The present invention also provides a process for manufacturing the self-drilling anchor rod, comprising:

[0027] The steel is rolled in an axial feed manner, and a single-handed thread is machined on the outer peripheral surface of the middle part of the steel, so as to prepare a primary processed anchor rod with a single-handed thread in the middle part;

[0028] The two ends of the primary processed anchor rod are respectively subjected to positive and reverse radial rolling methods, and double-handed threads are processed at both ends of the single-handed thread in the middle of the primary processed anchor rod, so as to obtain a self-drilling anchor rod with single-handed thread in the middle and double-handed thread sections at both ends.

[0029] As an optional embodiment of the present invention, a right-handed thread is processed at both ends of the primary processed anchor rod by a forward radial rolling method, and then a left-handed thread is processed at both ends of the primary processed anchor rod with a right-handed thread by a reverse radial rolling method, and the left-handed thread and the right-handed thread are intertwined to form a double-handed thread;

[0030] The single-handed thread in the middle of the self-drilling anchor has the same hand direction and the same thread parameters as the right-handed thread in the double-handed threads at both ends, and is opposite to the left-handed thread in the double-handed threads at both ends, and is the same thread parameters; or, the single-handed thread in the middle of the self-drilling anchor has the same hand direction and the same thread parameters as the left-handed thread in the double-handed threads at both ends, and is opposite to the right-handed thread in the double-handed threads at both ends, and is the same thread parameters.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The self-drilling anchor rod of the present invention can realize dual-rotation drilling, and both ends of the anchor rod body have dual-rotation thread sections. In this way, in the actual construction process, both the large-diameter self-drilling anchor rod and the small-diameter self-drilling anchor rod can be adapted to the anchor drilling rig in the construction equipment. There is no need to customize the self-drilling anchor rod that is adapted to the anchor drilling rig in the on-site construction equipment. A large amount of inventory can be carried out to meet the needs of instant delivery on the construction site and ensure the construction progress.

[0033] The present invention discloses a self-drilling anchor rod capable of dual-rotation drilling. Both ends of the anchor rod body have dual-rotation thread sections, which can be adapted to an anchoring drill rig with right-handed or left-handed threads at a construction site, thereby achieving the versatility of the self-drilling anchor rod.

[0034] The present invention discloses a self-drilling anchor rod capable of realizing dual-rotation drilling. Both ends of the anchor rod body have dual-rotation thread sections, in which right-handed threads and left-handed threads coexist. In engineering applications, the anchor rod can have better adhesion with cement and can effectively improve the anchoring strength.

[0035] The present invention discloses a self-drilling anchor rod capable of realizing dual-direction drilling. Both ends of the anchor rod body have dual-direction thread sections. The right-handed thread and the left-handed thread coexist and are cross-arranged. The unique structure can evenly disperse stress and transfer stress well when encountering tensile and compressive loads.

[0036] The present invention provides a self-drilling anchor rod capable of dual-direction drilling, wherein the dual-direction thread sections at both ends of the anchor rod body include right-handed threads rotating clockwise along the entire outer circumference of the two ends of the anchor rod body and left-handed threads rotating counterclockwise along the entire outer circumference of the two ends of the anchor rod body. The right-handed threads and the left-handed threads are arranged crosswise with each other. In this way, when the self-drilling anchor rod is assembled and used, the tightness of the assembly connection is ensured to meet the construction requirements.

[0037] In summary, the self-drilling anchor rod of the present invention can realize dual-rotation drilling. The large diameter and small diameter do not need to distinguish between left-handed and right-handed threads, and can meet the adaptation of anchor drilling rigs with different thread rotation directions, thereby realizing the versatility of the self-drilling anchor rod, facilitating the factory's inventory management, and shortening the product delivery period. The self-drilling anchor rod of the present invention meets the tightness of the assembly connection, can evenly disperse stress, and transmit stress well, which can effectively improve the anchoring strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of an assembly structure of a self-drilling anchor capable of dual-rotational drilling according to an embodiment of the present invention;

[0039] Figure 2 A schematic structural diagram of a self-drilling anchor capable of dual-rotational drilling according to an embodiment of the present invention;

[0040] Figure 3 A self-drilling anchor rod capable of realizing dual-rotational drilling is provided in an embodiment of the present invention. Figure 2 A partial enlarged view of the middle A;

[0041] Figure 4 A self-drilling anchor rod capable of realizing dual-rotational drilling is provided in an embodiment of the present invention. Figure 2 A partial enlarged view of point B in the middle;

[0042] Figure 5 A schematic diagram of a specific application example of a self-drilling anchor rod capable of dual-rotational drilling according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0044] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0048] See also Figures 1 to 4 As shown, a self-drilling anchor rod capable of realizing dual-rotational drilling in the present embodiment comprises an anchor rod body 100, wherein both ends of the anchor rod body 100 respectively have dual-rotational thread segments (102, 103), wherein the dual-rotational thread segments (102, 103) comprise a right-handed thread 105 rotating clockwise along the entire outer circumference of both ends of the anchor rod body 100 and a left-handed thread 104 rotating counterclockwise along the entire outer circumference of both ends of the anchor rod body 100, wherein the right-handed thread 105 and the left-handed thread 104 are independently processed so as to form the right-handed thread 105 and the left-handed thread 104 intersecting and overlapping each other.

[0049] The present embodiment is a self-drilling anchor rod that can realize dual-rotation drilling. Both ends of the anchor rod body 100 have dual-rotation thread sections (102, 103). In this way, in the actual construction process, whether it is a large-diameter self-drilling anchor rod or a small-diameter self-drilling anchor rod, it can be adapted to the anchor drilling rig in the construction equipment. There is no need to customize the self-drilling anchor rod that is adapted to the anchor drilling rig in the on-site construction equipment. A large amount of inventory can be carried out to meet the needs of immediate delivery on the construction site and ensure the construction progress.

[0050] In the self-drilling anchor rod of the present embodiment which can realize dual-direction drilling, the right-handed thread 105 and the left-handed thread 104 are processed independently. Due to the rolling of the threads, the right-handed thread 105 and the left-handed thread 104 are crossed and overlapped with each other. The formed threads are different in shape from the left-handed or right-handed threads. Due to the overlapping effect, special dual-direction thread sections are formed on the thread circumference, which does not affect the matching of the internal and external threads.

[0051] The present embodiment is a self-drilling anchor rod that can realize dual-direction drilling. Both ends of the anchor rod body 100 have dual-direction thread sections (102, 103), which can be adapted to the anchor drilling rig with right-handed or left-handed threads at the construction site, thereby realizing the versatility of the self-drilling anchor rod.

[0052] The present embodiment is a self-drilling anchor rod capable of dual-direction drilling. Both ends of the anchor rod body 100 have dual-direction thread sections (102, 103). The right-handed thread 105 and the left-handed thread 104 coexist, which can have better adhesion with cement in engineering applications and can effectively improve the anchoring strength.

[0053] The present embodiment is a self-drilling anchor rod that can realize dual-direction drilling. Both ends of the anchor rod body 100 have dual-direction thread sections (102, 103). The right-handed thread 105 and the left-handed thread 104 coexist and are cross-arranged. The unique structure can evenly disperse the stress and transfer the stress well when encountering tensile and compressive loads.

[0054] The present embodiment is a self-drilling anchor that can realize dual-rotation drilling. The dual-rotation thread sections (102, 103) at both ends of the anchor body 100 include right-handed threads 105 that rotate clockwise along the entire outer circumference of the two ends of the anchor body 100 and left-handed threads 104 that are arranged counterclockwise along the entire outer circumference of the two ends of the anchor body 100. The right-handed threads 105 and the left-handed threads 104 are arranged to intersect with each other. In this way, when the self-drilling anchor is assembled and used, the tightness of the assembly connection is ensured to meet the construction requirements.

[0055] In summary, the self-drilling anchor rod of the present embodiment can realize dual-direction drilling. The large diameter and small diameter do not need to distinguish between left-handed and right-handed threads, and can meet the adaptation of anchor drilling rigs with different thread directions, thus realizing the versatility of the self-drilling anchor rod, facilitating the factory's inventory management, and shortening the product delivery period. The self-drilling anchor rod of the present embodiment meets the tightness of the assembly connection, can evenly disperse stress, and transmit stress well, which can effectively improve the anchoring strength.

[0056] As an optional implementation of this embodiment, this embodiment is a self-drilling anchor that can achieve dual-rotation drilling. The anchor body 100 includes a middle anchor segment 101 and a first dual-rotation thread segment 103 and a second dual-rotation thread segment 102 located at both ends of the middle anchor segment 101.

[0057] The outer circumference of the intermediate anchor section 101 described in this embodiment is provided with a single-handed thread, and the hand direction of the single-handed thread is the same as the hand direction of the right-handed thread 105 or the left-handed thread 104; in this way, during processing, the single-handed thread is first processed in the entire axial direction of the anchor body 100, and then secondary processing is performed on both ends of the intermediate anchor section 101 to obtain a first double-handed thread section 103 and a second double-handed thread section 102, thereby ensuring the processing efficiency of the self-drilling anchor that can achieve double-handed drilling.

[0058] Alternatively, the outer periphery of the middle anchor section 101 of the present embodiment is provided with the same double-handed thread as the first double-handed thread section 103 and the second double-handed thread section 102. In this way, the entire axial outer periphery of the self-drilling anchor for double-handed drilling in the present embodiment is provided with double-handed threads, and the right-handed thread 105 and the left-handed thread 104 coexist, which can have better adhesion with cement in engineering applications and can effectively improve the anchoring strength.

[0059] Further, see Figure 2-Figure 4 As shown, in this embodiment, a self-drilling anchor capable of dual-direction drilling is provided, wherein the pitch of the single-direction thread of the middle anchor section 101 is the same as the pitch P of the right-handed thread 105 or the left-handed thread 104 of the first dual-direction thread section 103 and the second dual-direction thread section 102;

[0060] The root thread profile of the single-handed thread of the middle anchor section 101 is the same as the root thread profile of the right-handed thread or the left-handed thread of the first double-handed thread section 103 and the second double-handed thread section 102;

[0061] The crest tooth profile of the single-handed thread of the intermediate anchor bolt section 101 is the same as the crest tooth profile of the right-handed thread or the left-handed thread of the first double-handed thread section 103 and the second double-handed thread section 102;

[0062] The tooth depth H1 of the single-handed thread of the middle anchor bolt section 101 is equal to the tooth depth H2 of the right-handed thread or the left-handed thread of the first double-handed thread section 103 or the second double-handed thread section 102 .

[0063] In this embodiment, the thread parameters of the single-handed thread of the middle anchor rod section 101 are basically consistent with the thread parameters of the right-handed thread or the left-handed thread of the first double-handed thread section 103 and the second double-handed thread section 102, which facilitates the process of first overall processing of the steel and then local secondary processing, reduces processing difficulty, and ensures processing efficiency.

[0064] The tooth depth H1 of the unidirectional thread of the middle anchor rod section 101 of this embodiment is greater than the tooth depth H2 of the right-handed thread or the left-handed thread of the first bidirectional thread section 103 and the second bidirectional thread section 102, mainly because the secondary processing is performed on both ends to reduce the tooth depth after the initial processing.

[0065] As an optional implementation of this embodiment, see Figure 1 , Figure 4 As shown, a self-drilling anchor rod of this embodiment can realize dual-rotation drilling, the first dual-rotation thread section 103 of the anchor rod body 100 is threadedly connected with the drill bit 200, the second dual-rotation thread section 102 of the anchor rod body 100 is threadedly connected with the connecting sleeve 300, the first dual-rotation thread section 103 supports the installation of left-handed internal thread drill bits and right-handed internal thread drill bits, and the second dual-rotation thread section 102 supports the installation of left-handed internal thread connecting sleeves and right-handed internal thread connecting sleeves, so that the self-drilling anchor rod of this embodiment can simultaneously meet the installation and adaptation of left-handed internal thread drill bits and right-handed internal thread drill bits, as well as left-handed internal thread connecting sleeves and right-handed internal thread connecting sleeves. However, the drill bit 200 and the connecting sleeve 300 at both ends of the same anchor rod body 100 have the same rotation internal thread, so that they can always be tightly connected during the drilling process.

[0066] Alternatively, the first double-handed threaded section 103 and the second double-handed threaded section 102 of the anchor body 100 of the present embodiment are respectively threadedly connected with the connecting sleeve 300, and the first double-handed threaded section 103 and the second double-handed threaded section 102 support the installation of the left-handed internal threaded connecting sleeve and the right-handed internal threaded connecting sleeve, and the connecting sleeves installed at both ends of the same anchor body 100 have the same hand-handed internal thread. The anchor body 100 of the present embodiment is connected and extended by the connecting sleeve 300 to meet the construction requirements; and the connecting sleeves installed at both ends of the same anchor body 100 have the same hand-handed internal thread to keep them tightly connected during the drilling process.

[0067] Alternatively, the first double-handed threaded section 103 of the anchor body 100 described in this embodiment is threadedly connected to the connecting sleeve 300, and the second double-handed threaded section 102 of the anchor body 100 is threadedly connected to a drill butt sleeve (not shown), the first double-handed threaded section 103 supports the installation of a left-handed internally threaded connecting sleeve and a right-handed internally threaded connecting sleeve, and the second double-handed threaded section 102 supports the installation of a left-handed internally threaded drill butt sleeve and a right-handed internally threaded drill butt sleeve, and the connecting sleeve 300 and the drill butt sleeve installed at both ends of the same anchor body 100 have the same hand-handed internal thread.

[0068] Furthermore, in the present embodiment, a self-drilling anchor rod capable of dual-rotational drilling is provided, wherein a centering device 400 is mounted on the anchor rod body 100 between the connecting sleeve 300 and the middle anchor rod section 101, and the centering function of the anchor rod body is achieved by positioning the end face of the connecting sleeve during the drilling process; during the drilling process, the broken rock and soil discharged from the borehole is squeezed and pressed against the centering device 400 to achieve the centering function.

[0069] As an optional implementation of this embodiment, see Figure 5 As shown, a self-drilling anchor rod that can realize dual-rotation drilling in this embodiment, the anchor rod body 100 is connected in series in sequence through a connecting sleeve 300 to form a self-drilling anchor rod, a drill bit 200 is installed at one end of the self-drilling anchor rod, and it is drilled into the target construction object, and the other end extends out of the target construction object. The end of the self-drilling anchor rod extending out of the target construction object is erected and fixed by a support device; the left-handed internal thread nut 601 and the right-handed internal thread nut 602 are simultaneously tightened on the dual-rotation thread section at the end of the self-drilling anchor rod, and are fixedly connected to the support device. In this embodiment, the left-handed internal thread nut 601 and the right-handed internal thread nut 602 can be screwed on at the same time in the support device, effectively preventing the nuts from loosening and keeping the load stable.

[0070] Furthermore, the support device described in this embodiment includes a supporting steel frame 801, a pad 500 and a reinforcing anchor 802, the supporting steel frame 801 is supported on the outer wall surface of the target construction object, the pad 500 is fixedly installed on the supporting steel frame 801, and the reinforcing anchor 802 is distributed on the periphery of the supporting steel frame 801, one end of the reinforcing anchor 802 is anchored inside the target construction object, and the other end is fixedly connected to the supporting steel frame 801.

[0071] The backing plate 500 of this embodiment is provided with a through hole for the double-threaded section at the end of the self-drilling anchor to pass through, and the double-threaded section is simultaneously fastened with a left-handed internally threaded nut 601 and a right-handed internally threaded nut 602 to fix the end of the self-drilling anchor to the backing plate 500.

[0072] Optionally, the self-drilling anchor is drilled into the target construction object at an angle, and a wedge-shaped seamless tube body 700 is sleeved on the double-threaded section at the end of the self-drilling anchor, one end of the wedge-shaped seamless tube body 700 is an inclined surface that fits with the pad 500, and the other end of the wedge-shaped seamless tube body 700 is a straight surface that fits with the left-handed internal threaded nut 601 or the right-handed internal threaded nut 602.

[0073] See also Figure 5 As shown, a self-drilling anchor rod capable of dual-rotational drilling in this embodiment is described in detail as follows:

[0074] The self-drilling anchor described in this embodiment has a first double-handed threaded section 103 with a double-handed external thread equipped with a drill bit 200 with an internal thread, and a second double-handed threaded section 102 with a centering device 400. The centering device 400 has a shape similar to a sprocket, a smooth inner hole, and an empty sleeve on the surface of the second double-handed threaded section 102. The second double-handed threaded section 102 of the anchor body 100 is connected to the left-handed (right-handed) internal thread of the connecting sleeve 300. The connecting sleeve 300 is made of a seamless steel pipe, has a smooth outer edge, and the inner hole is processed to match the other threads of the anchor. The inner thread of the connecting sleeve 300 is provided with an empty knife groove and a termination end in the middle, which is convenient for the bidirectional external thread connection with the anchor body 100. The left-handed (right-handed) inner thread of the connecting sleeve 300 is threadedly connected with the second self-drilling anchor. The pad 500 is formed by stamping a hot-rolled steel plate, and is formed into an arch shape on the outside and has a hole in the middle. It is passed through the middle hole on the second anchor body 100. The left-handed inner thread nut 601 and the right-handed inner thread nut 602 are simultaneously tightened on the double-handed threaded section at the other end of the second anchor body 100, forming the entire self-drilling anchor.

[0075] The anchor body 100 is a seamless steel pipe with external threads on the surface. The external threads are composed of three sections: left-handed threads at the left end, left-handed threads in the middle, and left-handed threads at the right end. The left-handed threads are round threads with a pitch of 12 and a left-handed direction. The left-handed threads in the middle are round threads with a pitch of 12 and a left-handed direction.

[0076] This embodiment also provides a process for manufacturing the self-drilling anchor rod, including:

[0077] The steel is rolled with axial feed to produce left / right-hand threads on the outer surface of the steel to prepare primary anchor rods;

[0078] The two ends of the primary anchor rod are processed with right / left-hand threads by radial rolling to obtain a self-drilling anchor rod with double-hand thread sections at both ends.

[0079] In the present embodiment, a process for manufacturing the self-drilling anchor rod is to firstly adopt an axial feed rolling method to process the entire axial outer peripheral surface of the steel material, and the entire axial outer peripheral surface of the prepared primary processing anchor rod is set with a single-handed thread. The right / left-handed threads are processed by radial rolling method at both ends of the primary processing anchor rod, and secondary processing is performed to obtain a self-drilling anchor rod with double-handed thread segments at both ends. Due to the axial feed rolling method, a large pressure is generated on the processed object. If the axial feed rolling method is used for both processing, the secondary axial feed rolling may flatten and damage the single-handed thread rolled by the first axial feed. Therefore, in the present embodiment, the right / left-handed threads are processed by radial rolling method at both ends of the primary processing anchor rod, and a self-drilling anchor rod with double-handed thread segments at both ends is formed based on the primary processing anchor rod. The pressure exerted by the radial rolling method on the primary processing anchor rod is much less than that by the axial feed rolling method, so as to avoid flattening and damaging the single-handed thread rolled by the first axial feed.

[0080] Furthermore, in order to facilitate processing, in a manufacturing process of a self-drilling anchor rod in this embodiment, the right / left-handed threads processed by radial rolling at both ends of the primary processing anchor rod have the same thread parameters as the left / right-handed threads on the primary processing anchor rod.

[0081] This embodiment also provides a process for manufacturing the self-drilling anchor rod, including:

[0082] The steel is rolled in an axial feed manner, and a single-handed thread is machined on the outer peripheral surface of the middle part of the steel, so as to prepare a primary processed anchor rod with a single-handed thread in the middle part;

[0083] The two ends of the primary processed anchor rod are respectively subjected to positive and reverse radial rolling methods, and double-handed threads are processed at both ends of the single-handed thread in the middle of the primary processed anchor rod, so as to obtain a self-drilling anchor rod with single-handed thread in the middle and double-handed thread sections at both ends.

[0084] The manufacturing process of the self-drilling anchor rod in this embodiment adopts an axial feed rolling method to process the steel, and only processes a single-handed thread on the outer peripheral surface of the middle part of the steel. The two ends are rolled with the same diameter as the middle part but do not have a single-handed thread. The self-drilling anchor rod with double-handed thread sections at both ends is processed by positive and reverse radial rolling.

[0085] Optionally, right-handed threads are processed at both ends of the primary processed anchor rod by forward radial rolling, and left-handed threads are processed at both ends of the primary processed anchor rod with right-handed threads by reverse radial rolling. The left-handed threads and right-handed threads intersect to form double-handed threads.

[0086] For the convenience of processing, the single-handed thread in the middle of the self-drilling anchor described in this embodiment has the same hand direction and thread parameters as the right-handed thread in the double-handed threads at both ends, and is opposite to the left-handed thread in the double-handed threads at both ends, and has the same thread parameters; or, the single-handed thread in the middle of the self-drilling anchor has the same hand direction and thread parameters as the left-handed thread in the double-handed threads at both ends, and is opposite to the right-handed thread in the double-handed threads at both ends, and has the same thread parameters.

[0087] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A self-drilling anchor capable of achieving dual-rotational drilling, characterized in that: It includes an anchor rod body, and both ends of the anchor rod body respectively have double-handed thread sections, and the double-handed thread sections include right-handed threads rotating clockwise along the entire outer circumference of both ends of the anchor rod body and left-handed threads rotating counterclockwise along the entire outer circumference of both ends of the anchor rod body. The right-handed threads and the left-handed threads are independently processed respectively, so that the right-handed threads and the left-handed threads are crossed and overlapped with each other.

2. A self-drilling anchor capable of dual-rotational drilling according to claim 1, characterized in that: The anchor body comprises a middle anchor section and a first double-handed thread section and a second double-handed thread section located at two ends of the middle anchor section; A unidirectional thread is arranged on the outer circumference of the middle anchor bolt section, and the direction of rotation of the unidirectional thread is the same as that of the right-hand thread or the left-hand thread; Alternatively, the outer periphery of the middle anchor section is provided with the same double-handed thread as the first double-handed thread section and the second double-handed thread section.

3. A self-drilling anchor capable of dual-rotational drilling according to claim 2, characterized in that: The pitch of the unidirectional thread of the intermediate anchor bolt section is the same as the pitch of the right-hand thread or the left-hand thread of the first bidirectional thread section and the second bidirectional thread section; The root tooth profile of the single-handed thread of the middle anchor section is the same as the root tooth profile of the right-handed thread or the left-handed thread of the first double-handed thread section and the second double-handed thread section; The crest tooth profile of the single-handed thread of the middle anchor section is the same as the crest tooth profile of the right-handed thread or the left-handed thread of the first double-handed thread section and the second double-handed thread section; The tooth depth of the single-handed thread of the middle anchor rod section is equal to the tooth depth of the right-handed thread or the left-handed thread of the first double-handed thread section and the second double-handed thread section.

4. A self-drilling anchor capable of dual-rotational drilling according to claim 2, characterized in that: The first double-handed thread section of the anchor body is threadedly connected to the drill bit, and the second double-handed thread section of the anchor body is threadedly connected to the connecting sleeve. The first double-handed thread section supports the installation of a left-handed internally threaded drill bit and a right-handed internally threaded drill bit, and the second double-handed thread section supports the installation of a left-handed internally threaded connecting sleeve and a right-handed internally threaded connecting sleeve. The drill bit and the connecting sleeve installed at both ends of the same anchor body have the same hand-handed internal threads. Alternatively, the first double-handed threaded section and the second double-handed threaded section of the anchor body are respectively threadedly connected to the connecting sleeve, and the first double-handed threaded section and the second double-handed threaded section support the installation of the left-handed internally threaded connecting sleeve and the right-handed internally threaded connecting sleeve, and the connecting sleeves installed at both ends of the same anchor body have the same hand-handed internal threads; Alternatively, the first double-handed thread section of the anchor body is threadedly connected to the connecting sleeve, and the second double-handed thread section of the anchor body is threadedly connected to the drill butt sleeve, the first double-handed thread section supports the installation of a left-handed internally threaded connecting sleeve and a right-handed internally threaded connecting sleeve, and the second double-handed thread section supports the installation of a left-handed internally threaded drill butt sleeve and a right-handed internally threaded drill butt sleeve, and the connecting sleeve and the drill butt sleeve installed at both ends of the same anchor body have the same hand-handed internal thread.

5. The self-drilling anchor capable of dual-rotational drilling according to claim 2, characterized in that: The anchor rod bodies are connected in series in sequence through the connecting sleeve to form a self-drilling anchor rod, a drill bit is installed at one end of the self-drilling anchor rod to drill into the target construction object, and the other end extends out of the target construction object, and the end of the self-drilling anchor rod extending out of the target construction object is erected and fixed by a supporting device; A left-handed internal thread nut and a right-handed internal thread nut are simultaneously fastened on the double-handed threaded section at the end of the self-drilling anchor rod and fixedly connected to the supporting device.

6. A self-drilling anchor capable of dual-rotational drilling according to claim 5, characterized in that: The support device comprises a supporting steel frame, a pad and reinforcing anchor bars, wherein the supporting steel frame is supported on the outer wall surface of the target construction object, the pad is fixedly mounted on the supporting steel frame, the reinforcing anchor bars are distributed on the outer periphery of the supporting steel frame, one end of the reinforcing anchor bars is anchored inside the target construction object, and the other end is fixedly connected to the supporting steel frame; The backing plate is provided with a through hole for the double-handed threaded section at the end of the self-drilling anchor to pass through, and a left-handed internally threaded nut and a right-handed internally threaded nut are simultaneously tightened on the double-handed threaded section to fix the end of the self-drilling anchor to the backing plate. Optionally, the self-drilling anchor is drilled into the target construction object at an angle, and a wedge-shaped seamless tube body is sleeved on the double-threaded section at the end of the self-drilling anchor, one end of the wedge-shaped seamless tube body is an inclined surface that fits with the pad, and the other end of the wedge-shaped seamless tube body is a straight surface that fits with the left-handed internal threaded nut or the right-handed internal threaded nut.

7. A process for manufacturing a self-drilling anchor as claimed in any one of claims 1 to 6, characterized in that: include: The steel is rolled with axial feed to produce left / right-hand threads on the outer surface of the steel to prepare primary anchor rods; The two ends of the primary anchor rod are processed with right / left-hand threads by radial rolling to obtain a self-drilling anchor rod with double-hand thread sections at both ends.

8. A process for manufacturing a self-drilling anchor according to claim 7, characterized in that: The right-handed / left-handed threads processed by radial rolling at both ends of the primary processed anchor rod have the same thread parameters as the left-handed / right-handed threads on the primary processed anchor rod.

9. A process for manufacturing a self-drilling anchor as claimed in any one of claims 1 to 6, characterized in that: include: The steel is rolled in an axial feed manner, and a single-handed thread is machined on the outer peripheral surface of the middle part of the steel, so as to prepare a primary processed anchor rod with a single-handed thread in the middle part; The two ends of the primary processed anchor rod are respectively subjected to positive and reverse radial rolling methods, and double-handed threads are processed at both ends of the single-handed thread in the middle of the primary processed anchor rod, so as to obtain a self-drilling anchor rod with single-handed thread in the middle and double-handed thread sections at both ends.

10. A process for manufacturing a self-drilling anchor according to claim 9, characterized in that: The two ends of the primary processed anchor rod are processed into right-handed threads by forward radial rolling, and the two ends of the primary processed anchor rod with right-handed threads are processed into left-handed threads by reverse radial rolling, and the left-handed threads and the right-handed threads are crossed to form a double-handed thread; The single-handed thread in the middle of the self-drilling anchor has the same hand direction and the same thread parameters as the right-handed thread in the double-handed threads at both ends, and is opposite to the left-handed thread in the double-handed threads at both ends, and is the same thread parameters; or, the single-handed thread in the middle of the self-drilling anchor has the same hand direction and the same thread parameters as the left-handed thread in the double-handed threads at both ends, and is opposite to the right-handed thread in the double-handed threads at both ends, and is the same thread parameters.

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