Adapter for rockbolt and rockbolt construction method

Abstract

The present invention relates to an adapter for a rock bolt and a method for installing a rock bolt, and more specifically, to an adapter for a rock bolt and a method for installing a rock bolt that can be more easily connected to a support material such as a rock bolt. The present invention comprises a fixed body; a first body into which the front end of the fixed body is inserted and which is rotatably connected to the fixed body; and a second body having a thread on its inner side to be coupled with a lock bolt having a thread on its outer side, which is provided in front of the first body and extends forward.

Description

Technology Field

[0001] The present invention relates to an adapter for a rock bolt and a method for installing a rock bolt, and more specifically, to an adapter for a rock bolt and a method for installing a rock bolt that can be more easily connected to and installed with the rock bolt. Background Technology

[0002] Support materials generally refer to members or the collective term for materials that support, reinforce, or cover the ground during or after excavation to ensure the stability of the tunnel and the safety of construction.

[0003] A representative example of the aforementioned support material is the rock bolt. Rock bolts are bolts inserted to reinforce the excavated rock face and are installed to stabilize the original ground by integrating the rock mass.

[0004] Rock bolt anchoring methods include tip anchoring, front anchoring, and combined methods.

[0005] The aforementioned rock bolt is generally installed by inserting the bolt into a bore hole in the rock and subsequently injecting mortar into the bore hole.

[0006] Previously, deformed steel bars were used for rock bolts, but the aforementioned deformed steel bars were heavy, and since the mortar was filled sequentially through the boreholes during injection, the bottom portion at the end of the boreholes was not filled with mortar, causing defects during filling.

[0007] Therefore, recently, rock bolts with a hollow interior are used. A hole is formed at the shear end of the rock bolt that penetrates both the inside and outside of the pipe body, allowing the mortar to be filled from the bottom of the bore hole as it is injected into the pipe body.

[0008] Therefore, an injection device for injecting mortar must be connected to the rear end of the rock bolt (the rear end of the pipe mentioned above).

[0009] Registered Patent No. 10-2253066 (hereinafter referred to as prior art) relates to a method for constructing a hollow rock bolt for tunnel construction, and this prior art describes a technical concept of connecting the injection device to the rear end of the rock bolt.

[0010] More specifically, a supply hose for pressurizing grout material into the injection passage of a threaded bolt is connected to an adapter, and the adapter has a configuration in which it is threaded with the threaded bolt of a rock bolt.

[0011] However, this conventional technology had problems such as the fact that the aforementioned adapter had to be rotated relative to the computer bolt, and in that case, the aforementioned supply hose could also be rotated, causing the supply hose to become twisted and bent, making it difficult to easily inject grout material, such as the aforementioned mortar, into the pipe (bolt). The problem to be solved

[0012] The present invention was devised to solve the above problems and aims to provide a rock bolt adapter and a rock bolt installation method that facilitate installation by facilitating connection with the rock bolt while minimizing deformation or damage to the injection device for injecting grout materials such as mortar.

[0013] In addition, the present invention aims to provide a rock bolt adapter and a rock bolt installation method that are easy to replace and maintain. means of solving the problem

[0014] The present invention, aimed at solving the above problem, has the following structure and features.

[0015] A rotating body comprising: a fixed body; a first body into which the front end of the fixed body is inserted and which is rotatably connected to the fixed body; and a second body having an inner thread so as to be coupled with a lock bolt having an outer thread and which is provided from the front of the first body forward.

[0016] Additionally, it may further include a mounting portion formed by a first semi-groove formed on the outer front surface of the fixed body and a second semi-groove formed on the inner surface of the first body; and a ball inserted into the mounting portion.

[0017] Additionally, the rotating body may further include an access hole formed to penetrate the outer surface of the first body and the second semi-groove, and an opening / closing member detachably coupled to the first body and opening / closing the access hole.

[0018] Additionally, the above-mentioned entrance hole is a screw hole, and the above-mentioned opening / closing member may include a fastening part having screw threads formed to be screw-fastened with the above-mentioned screw hole, and a pressing part provided at the inner end of the fastening part and pressing the first half-groove as the fastening part moves inward.

[0019] Additionally, the second body may have an inner width smaller than the inner width of the first body, and the fixed body may include the first body, and a second body that protrudes forward by the length of the first body from the front of the first body, has an outer width smaller than the first body, has an outer width larger than the inner width of the second body, and is inserted into the inside of the first body.

[0020] Additionally, the fixed body may further include an installation groove formed on the outer surface of the second body and positioned forward of the first semi-groove; and a sealing member inserted into and installed in the installation groove.

[0021] In addition, the rotating body may further include a plurality of protrusions provided on the outer surface of the second body.

[0022] Additionally, the injection member may further include a coupling part detachably coupled to the front end of the fixed body, an insertion part protruding forward from the front end of the coupling part, penetrating the rotating body and inserted into the lock bolt, and an inclined part protruding forward from the front end of the insertion part, with the inner width decreasing as it extends forward.

[0023] In addition, the fixed body is provided with screw threads on the inner surface of the front portion, and the coupling portion may include a pipe portion and a screw thread provided on the outer surface of the pipe portion that is screw-fastened with the screw threads formed on the inner surface of the fixed body.

[0024] Additionally, the fixed body may include a third body protruding rearward from the rear of the first body, and the third body may include a first through-hole formed on the inner side and communicating with the inner side of the first body, and a second through-hole disposed behind the first through-hole, communicating with the first through-hole, and decreasing in width as it extends forward.

[0025] A method for constructing a rock bolt using an adapter for a rock bolt comprises: a step of drilling a rock to form a drilling hole (drilling groove) (S10); a step of inserting the front side of a rock bolt into the drilling hole (S20); a step of inserting the rear side of the rock bolt into the inside of a rotating body and rotating the rotating body relative to a fixed body to combine the rotating body and the rock bolt (S30); and a step of connecting a grout injection device to the fixed body and injecting the grout into the inside of the rock bolt using the injection device (S40). Effects of the invention

[0026] The present invention, having the above configuration and features, has the effect of facilitating installation by facilitating fastening with a rock bolt while minimizing deformation or damage to the injection device for injecting grout materials such as mortar.

[0027] In addition, the present invention has the effect of being easy to replace and maintain. Brief explanation of the drawing

[0028] FIG. 1 is a drawing illustrating the state in which an adapter for a rock bolt according to one embodiment of the present invention is connected to a rock bolt. FIG. 2 is a photograph of an adapter for a lock bolt according to one embodiment of the present invention. Figure 3 is a cross-sectional view of an adapter for a lock bolt. Figure 4 is an exploded view of an adapter for a lock bolt. Figure 5 is a drawing for explaining the screw threads and protrusions of a rotating body. FIG. 6 is a drawing for explaining the rotating body and the second half-groove. Figure 7 is a drawing for explaining the third body. Figure 8 is a drawing for explaining the screw threads of a fixed body. FIG. 9 is a schematic flowchart for explaining the installation of an adapter for a rock bolt according to one embodiment of the present invention. Specific details for implementing the invention

[0029] The present invention is capable of various modifications and may take various forms, and embodiments (aspects or examples) are to be described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0030] The terms used in this specification are used merely to describe specific embodiments (aspects or examples) and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “comprising” or “consisting of” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0031] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0032] The terms "~1~," "~2~," etc., described in this specification are used merely to distinguish different components and are not bound by the order of manufacture; furthermore, the names may not match those in the detailed description of the invention and the claims.

[0033] Throughout the entire specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other elements interposed between them.

[0034] FIG. 1 is a drawing illustrating the state in which an adapter for a rock bolt according to an embodiment of the present invention is fastened to a rock bolt. FIG. 2 is a photograph illustrating an adapter for a rock bolt according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of an adapter for a rock bolt. FIG. 4 is an exploded view of an adapter for a rock bolt. FIG. 5 is a drawing illustrating the screw threads and protrusions of a rotating body.

[0035] Referring to Fig. 1, the rock bolt (B) is installed as a ground reinforcement to prevent rock collapse.

[0036] Generally, when constructing a structure such as a tunnel, the rock mass is drilled to form a bore hole, and the rock bolt (B) described above is inserted into the bore hole. Subsequently, recently, a grout material (e.g., mortar) is injected into the inner hollow of the rock bolt (B).

[0037] The injection device for injecting grout material into the above rock bolt (B) generally includes a supply hose, and a fastening device for connecting the supply hose and the rock bolt (B) (an object to be compared with the adapter (A) for a rock bolt according to one embodiment of the present invention) was used.

[0038] The above-mentioned prior art fastened the aforementioned fastening device by rotating it relative to the lock bolt, but this resulted in problems such as the supply hose also rotating along with the fastening device and becoming twisted.

[0039] An adapter (A) for a rock bolt according to one embodiment of the present invention complements the aforementioned conventional fastening device, etc. and is fastened to a rock bolt (B), and for convenience of explanation, it will be referred to as the ‘this device’ below.

[0040] Referring to FIG. 2, the device (adapter for a lock bolt (A) according to one embodiment of the present invention) includes a fixed body (1) and a rotating body (2).

[0041] Referring to FIGS. 3 and 4, the fixed body (1) may include a first body (11) having a hollow formed on its inner side, and a second body (12) protruding forward from the front of the first body (11) and having a hollow formed on its inner side that communicates with the hollow of the first body (11).

[0042] Here, the inner side refers to the centerline side parallel to the front-rear direction with respect to FIG. 3, and the outer side refers to the radial direction from the inner side, which refers to the up-down direction with respect to FIG. 3. The same shall be applied hereinafter.

[0043] Additionally, the fixed body (1) may include a third body (13) that protrudes rearward from the rear of the first body (11) described above. The third body (13) may include through holes (first through hole (131), second through hole (132)) described later that communicate with the first body (11) on the inside.

[0044] Here, the front (front end, front side, front end side, etc.) refers to the side of the rock bolt (B) based on the device, and refers to the left direction (left end, left side, left side, etc.) based on FIG. 3, and the rear (rear end, rear side, etc.) refers to the right direction (right end, right side, etc.) based on FIG. 3, and will be applied in the same way in the following description.

[0045] The above-described third body (13) can be connected according to various known methods so that the supply hose of the above-described injection device, etc., is connected.

[0046] The description of the fixed body (1) mentioned above will be explained in more detail in the description that follows.

[0047] Referring to FIGS. 3 and 4, the rotating body (2) includes a first body (21) into which the front portion (the first body (11)) of the fixed body (1) is inserted and which is rotatably connected to the fixed body (1).

[0048] The first body (21) described above includes a first through hole formed along the front-rear direction on the inside, and the first body (11) described above can be inserted into the first through hole.

[0049] Additionally, the rotating body (2) includes a second body (22) having a screw thread (221) on the inside so as to be screw-coupled with a lock bolt (B) having a screw thread on the outside (see FIG. 1) which is provided to protrude forward from the front of the first body (21) (see FIG. 5).

[0050] The second body (22) may have a second through hole formed along the front and rear directions that communicates with the first through hole on the inner side, and the rear end of the rock bolt (B) may be inserted into the second through hole.

[0051] At this time, the above-mentioned rock bolt (B) is provided with screw threads on its outer surface, and the above-mentioned second body (22) may be provided with screw threads (121) on its inner surface forming the second through hole so as to be screw-fastened with the screw threads formed on the outer surface of the rock bolt (B).

[0052] Therefore, when the above-described rotating body (2) rotates with respect to the lock bolt (B) with the front and rear directions as the central axis, the above-described rotating body (2) can be screw-fastened to the lock bolt (B).

[0053] FIG. 6 is a drawing for explaining the rotating body and the second half-groove.

[0054] At this time, it was stated that the aforementioned rotating body (2) (first body (21)) is rotatably connected to the aforementioned fixed body (1), and the device may include a mounting part (3) and a ball (4) that rotatably connect the aforementioned first body (21) and the fixed body (1).

[0055] Below, with reference to FIGS. 3, FIGS. 4, and FIGS. 6, the mounting part (3) and the ball (4) will be described in detail.

[0056] Referring to FIGS. 3, 4, and 6, the mounting portion (3) (see FIG. 3) may include a first half-groove (31) (see FIG. 4) formed on the outer surface of the front side (the first body (11)) of the fixed body (1), and a second half-groove (32) (see FIG. 6) formed on the inner surface (inner circumference) of the first body (21).

[0057] That is, the mounting portion (3) is formed by the first half-groove (31) and the second half-groove (32) described above.

[0058] At this time, referring to FIGS. 3 and FIGS. 4, the ball (4) is inserted into the mounting part (3). The ball (4) may be, for example, a steel ball and may move or rotate within the mounting part (3).

[0059] The above-mentioned mounting part (3) and ball (4) can perform the role of a bearing that rotates the fixed body (1) and the rotating body (2).

[0060] As described above, the first body (11) of the fixed body (1) is inserted into the first body (21) of the rotating body (2), thereby restricting the vertical movement of the fixed body (1) relative to the rotating body (2) (vertical movement based on FIG. 3).

[0061] In addition, as described above, as the ball (4) is inserted into the mounting part (3), the movement of the rotating body (2) forward relative to the fixed body (1) is restricted, and the movement of the fixed body (1) backward relative to the rotating body (2) is restricted.

[0062] In addition, since the ball (4) mentioned above rotates in the mounting part (3), the rotating body (2) is rotatably coupled to the fixed body (1).

[0063] Therefore, with the injection device connected to the rear side (third body (13)) of the fixed body (1) mentioned above, the fixed body (1) mentioned above is not rotated, and the rotating body (2) mentioned above can be rotated with respect to the fixed body (1) with the front and rear directions as the central axis, so that it can be screw-fastened with the lock bolt (B) mentioned above.

[0064] Therefore, since there is no need to further rotate the aforementioned injection device, the supply hose, etc., can be prevented from twisting.

[0065] Referring to FIGS. 2 to 4, the rotating body (2) may include an access hole (23) formed to penetrate the outer surface of the first body (21) and the second semi-groove (32), and an opening / closing member (24) detachably coupled to the first body (21) and opening / closing the access hole (23).

[0066] When the opening / closing member (24) is separated from the first body (21) to open the opening / closing hole (23), the ball (4) can be removed through the opening / closing hole (23) while rotating the rotating body (2) relative to the fixed body (1). In this case, the rotating body (2) can be moved forward relative to the fixed body (1) to separate the fixed body (1) and the rotating body (2), thereby improving the ease of replacement and maintenance of the device.

[0067] In addition, the first body (11) is inserted into the first through hole of the first body (21) to form the mounting part (3), and a ball (4) is inserted into the mounting part (3) through the entrance / exit hole (23), and the opening / closing member (24) is coupled to the first body (21) to close the entrance / exit hole (23), thereby allowing the fixed body (1) and the rotating body (2) to be coupled together.

[0068] Referring to FIGS. 2 and 4, the entrance / exit hole (23) may have a screw thread on the thickness surface of the first body (21) forming the entrance / exit hole (23). At this time, the opening / closing member (24) may include a fastening part (241) having a screw thread to penetrate the screw hole and to be screw-fastened with the screw hole, and a pressing part (242) protruding inward from the inner end of the fastening part (241) and pressing the first half-groove (31) inward as the fastening part (241) moves inward.

[0069] The above-described pressure member (242) may have a width (length in the left-right direction based on FIG. 4 in a direction perpendicular to the length direction of the coupling member (24)) that decreases as it moves inward, and thus, when the above-described fastening member (241) moves inward as it is screwed into the screw hole, the pressure member (242) can be inserted into the first half-groove (31) and press the first half-groove (31) inward.

[0070] Since the above-mentioned first half-groove (31) is formed in the first body (11), the opening / closing member (24), which is screw-fastened to the rotating body (2) having the screw hole formed therein, presses the above-mentioned first half-groove (31) and presses the first body (11) having the first half-groove (31) formed therein, thereby preventing the rotating body (2) from rotating further relative to the fixed body (1).

[0071] That is, during the process of injecting grout material after the rotating body (2) is connected to the rock bolt (B), the fixed body (1) can be prevented from rotating relative to the rotating body (2) without the operator holding the device.

[0072] Since the above-mentioned opening / closing member (24) is screw-fastened to a screw hole, coupling and uncoupling with the first body (21) can be performed simply by rotating the opening / closing member (24) with its length direction as the central axis.

[0073] Referring to FIG. 5, the rotating body (2) may include a plurality of protrusions (25) that protrude outwardly from the outer surface of the second body (22).

[0074] Through this, the operator can easily rotate the aforementioned rotating body (2) relative to the fixed body (1).

[0075] Referring to FIGS. 1 and 6, the inner width of the second body (22) is smaller than the inner width of the first body (21). That is, the diameter of the second through hole may be smaller than the diameter of the first through hole (the width and diameter of each member of the device, excluding the connecting member (24), refer to the vertical length based on FIG. 3).

[0076] At this time, referring to FIGS. 3 and 4, the second body (12) may have a smaller outer width than the first body (11). Also, the protruding length (length in the front-rear direction) of the second body (12) may correspond to the length in the front-rear direction of the first body (21).

[0077] That is, the second body (12) can protrude forward from the front of the first body (11) by the length of the first body (21).

[0078] In addition, the second body (12) has an outer width larger than the inner width of the second body (22) and can be inserted into the first body (21).

[0079] Accordingly, when the above-mentioned second body (12) is completely inserted into the inside of the first body (21), the rear end of the first body (21) can be supported on the front side of the first body (11), and the front side of the second body (12) can be supported on the rear side of the above-mentioned second body (22).

[0080] Through this, the fixed body (1) and the rotating body (2) can be structurally stable when combined.

[0081] In addition, the mounting portion (3) described above can be formed by the first half-groove (31) and the second half-groove (32) described above when the second body (12) described above is completely inserted into the first through hole described above, and the mounting portion (3) can be formed when the second body (12) described above is completely inserted into the inside of the first body (21).

[0082] That is, when the rear end of the first body (21) is supported on the front side of the first body (11), a mounting part (3) is formed, so the formation of the mounting part (3) and the insertion of the ball (4) into the mounting part (3) can be performed more easily. Through this, the fixed body (1) and the rotating body (2) can be combined more easily.

[0083] Referring to FIGS. 3 and 4, the fixed body (1) may include an installation groove (14) (see FIG. 3) formed on the outer surface of the second body (12) and positioned further forward than the first half-groove (31), and a sealing member (15) inserted into and installed in the installation groove (14).

[0084] The above-described sealing member (15) may be, for example, an O-ring and can prevent mortar, etc. from moving between the above-described fixed body (1) and rotating body (2).

[0085] In particular, the aforementioned installation groove (14) is positioned further forward than the first half-groove (31), thereby preventing mortar or the like that has passed through the inside of the second body (12) from flowing back into the space between the fixed body (1) and the rotating body (2) and coming into contact with the ball (4), thus protecting the ball (4) and allowing it to rotate easily in the mounting part (3). That is, there is an advantage that the rotating body (2) can be easily rotated relative to the fixed body (1) for a long period of time.

[0086] Figure 7 is a drawing for explaining the third body.

[0087] Referring to FIGS. 3 and 7, the third body (13) may include a first through-hole (131) formed on the inside and communicating with the inside of the first body (11), and a second through-hole (132) disposed behind the first through-hole (131) and communicating with the first through-hole (131), with the width decreasing as it moves forward.

[0088] This has the advantage of further improving the movement speed of the grout material supplied at a constant speed from the injection device.

[0089] Referring to FIGS. 3 and 4, the device may include an injection member (5) comprising a coupling part (51) that is detachably coupled to the front end (first body (11)) of the fixed body (1), and an insertion part (52) that is provided protruding forward from the front end of the coupling part (51), penetrates the rotating body (2), and is inserted into the inner hollow of the rear end of the lock bolt (B).

[0090] At this time, the injection member (5) described above may include an inclined portion (53) that protrudes forward from the front of the insertion portion (52) described above, with the inner width decreasing as it moves forward.

[0091] The injection member (5) described above may include an injection hole formed on the inner side. It may include a first injection hole formed on the inner side of the coupling part (51), a second injection hole formed on the inner side of the insertion part (52), and a third injection hole formed on the inner side of the inclined part (53). The first injection hole may be in communication with the inner hollow of the first body.

[0092] At this time, the width (diameter) of the aforementioned third injection hole may decrease as it extends forward.

[0093] This has the advantage of further improving the speed and pressure of the grout material injected through the above-mentioned injection device, thereby allowing the grout material to move easily toward the tip of the rock bolt (B).

[0094] Figure 8 is a drawing for explaining the screw threads of a fixed body.

[0095] As described above, the coupling part (51) is detachably coupled to the second body (12). Below, the coupling part (51) and the second body (12) will be described in more detail with reference to FIGS. 4 and FIGS. 8.

[0096] First, referring to FIG. 8, the fixed body (1) (second body (12)) may be provided with a screw thread (121) (coupling screw thread) on its inner surface.

[0097] At this time, the coupling portion (51) may include a tube portion (511) in which the first injection hole is formed on the inner side, and a screw thread (512) (corresponding screw thread) provided on the outer surface of the tube portion (511) and screw-fastened with a screw thread (121) (coupling screw thread) formed on the inner surface of the fixed body (1) (second body (12)).

[0098] Through this, the injection member (5) and the second body (12) can be separated or combined simply by rotating the injection member (5) relative to the second body (12), and there is an advantage that the injection member (5), etc. can be replaced or maintained more easily.

[0099] FIG. 9 is a schematic flowchart for explaining the installation of an adapter for a rock bolt according to one embodiment of the present invention.

[0100] Hereinafter, a method for constructing a rock bolt according to an embodiment of the present invention (hereinafter referred to as "the present method") will be described. The present method is a method for constructing a rock bolt (B) using the device described above, and since it includes technical features identical or corresponding to the device described above, the same reference numerals will be used for configurations identical or similar to those previously examined, and redundant descriptions will be simplified or omitted.

[0101] Referring to FIG. 9, the present method includes a drilling step (S10), an insertion step (S20), a joining step (S30), and an injection step (S40).

[0102] The drilling step (S10) is a step of drilling into the bedrock to form a drilled hole. The above-mentioned drilling step (S10) can be performed by a drilling device, etc.

[0103] The insertion step (S20) is a step of inserting the front side of the rock bolt (B) into the above-mentioned drilled hole.

[0104] In the above insertion step (S20), the rear side of the rock bolt (B) may protrude from the above-mentioned drilled hole.

[0105] The joining step (S30) is a step of inserting the rear side of the lock bolt (B) into the inside of the rotating body (2) and rotating the rotating body (2) relative to the fixed body (1) to join (screw fasten) the rotating body (2) and the lock bolt (B).

[0106] The injection step (S40) is a step of connecting an injection device for injecting grout material into the fixed body (1) and injecting grout material into the inside of the rock bolt (B) using the injection device.

[0107] The above injection device is commonly used in the relevant field, so a more detailed description will be omitted.

[0108] Although not shown, the present method may include a fixation step performed after the coupling step (S30) and before the injection step (S40).

[0109] The fixing step is a step of rotating the opening / closing member (24) to press the second body (12) in which the first semi-groove (31) is formed.

[0110] The present invention, as described above with reference to the attached drawings, is capable of various modifications and changes by a person skilled in the art, and such modifications and changes should be interpreted as being included within the scope of the rights of the present invention. Explanation of the symbols

[0111] Adapter for Lock Bolt: A Fixed Body: 1 First Body: 11 2nd Body: 12 3rd Body: 13 First General Study: 131 Second General Study: 132 Installation groove: 14 Sealing member: 15 Rotating body: 2 First body: 21 Second body: 22 Entrance / Exit: 23 Opening / closing member: 24 Fastening part: 241 Pressure part: 242 Protrusions: 25 Mounting part: 3 1st half-groove: 31 Second half-home: 32 Ball: 4 Injection member: 5 Connection part: 51 Tube: 511 Insert: 52 Slope: 53 Rockbolt: B

Claims

Claim 1 An adapter for a lock bolt comprising: a fixed body; a first body having a front end of the fixed body inserted therein and rotatably connected to the fixed body; and a second body having a screw thread on its inner side to be coupled with a lock bolt having a screw thread on its outer side and provided forward from the front of the first body; wherein the inner width of the second body is smaller than the inner width of the first body, and the fixed body comprises: a first body; and a second body protruding forward from the front of the first body by the length of the first body, having an outer width smaller than the first body, and having an outer width larger than the inner width of the second body, and inserted into the inner side of the first body. Claim 2 An adapter for a lock bolt according to claim 1, further comprising: a mounting portion formed by a first semi-groove formed on the front outer surface of the fixed body and a second semi-groove formed on the inner surface of the first body; and a ball inserted into the mounting portion. Claim 3 An adapter for a lock bolt according to claim 2, wherein the rotating body further comprises an access hole formed to penetrate the outer surface of the first body and the second semi-groove, and an opening / closing member detachably coupled to the first body and opening / closing the access hole. Claim 4 An adapter for a lock bolt according to claim 3, wherein the entry / exit hole is a screw hole, and the opening / closing member comprises a fastening part having screw threads formed to be screw-fastened with the screw hole, and a pressing part provided at the inner end of the fastening part and pressing the first semi-groove as the fastening part moves inward. Claim 5 delete Claim 6 An adapter for a rock bolt according to claim 1, wherein the fixed body further comprises: an installation groove formed on the outer surface of the second body and positioned forward of the first semi-groove; and a sealing member inserted into and installed in the installation groove. Claim 7 An adapter for a lock bolt according to claim 1, wherein the rotating body further comprises a plurality of protrusions provided on the outer surface of the second body. Claim 8 An adapter for a rock bolt according to claim 1, further comprising: a coupling part detachably coupled to the front end of the fixed body; an insertion part protruding forward from the front end of the coupling part, penetrating the rotating body and inserted into the rock bolt; and an inclined part protruding forward from the front end of the insertion part, wherein the inner width decreases as it extends forward. Claim 9 An adapter for a lock bolt according to claim 8, wherein the fixed body is provided with a screw thread on the inner surface of the front portion, and the coupling portion includes a pipe portion and a screw thread provided on the outer surface of the pipe portion and screw-fastened with the screw thread formed on the inner surface of the fixed body. Claim 10 An adapter for a rock bolt according to claim 1, wherein the fixed body comprises a third body protruding rearward from the rear of the first body, and the third body comprises a first through-hole formed on the inner side and communicating with the inner side of the first body, and a second through-hole disposed behind the first through-hole, communicating with the first through-hole, and having a width that decreases as it extends forward. Claim 11 A method for constructing a rock bolt using an adapter for a rock bolt described in claim 1, comprising: a step of drilling a rock to form a drilled hole (S10); a step of inserting the front side of a rock bolt into the drilled hole (S20); a step of inserting the rear side of the rock bolt into the inside of a rotating body and rotating the rotating body relative to the fixed body to combine the rotating body and the rock bolt (S30); and a step of connecting a grout injection device to the fixed body and injecting the grout into the inside of the rock bolt using the injection device (S40).

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