Reaming drill rod for anchor rod hole construction

Abstract

The utility model relates to a reaming drill rod for anchor rod hole construction, and relates to the technical field of civil construction devices. The reaming drill rod for anchor rod hole construction comprises at least two rod bodies which are detachably connected, one end of each rod body is an inserted rod section with an external thread, and the other end of each rod body is a sleeve section with an internal thread; the external thread on the insertion rod section can be matched with the internal thread on the sleeve section, and the insertion rod section of the rod body is screwed in the sleeve section of another adjacent rod body; the reaming drill rod further comprises a reamer, the two ends of the reamer are connected with the ends of the two adjacent rod bodies respectively, and a deformation part is arranged in the middle of the reamer. When the two adjacent rod bodies rotate relatively to generate axial displacement, the deformation part of the corresponding reamer between the two rod bodies can generate radial deformation. According to the broaching drill rod, broaching is conducted in the middle of the anchor rod hole through the broaching device, so that the anchor rod body can be locally expanded, the pulling resistance of the anchor rod is greatly improved, and the use efficiency of the anchor rod is improved.

Description

Technical Field

[0001] The present application relates to the technical field of civil construction equipment, and in particular to a hole-enlarging drill rod for anchor hole construction. Background Art

[0002] Anchor rods are a rod system structure for rock and soil reinforcement. The longitudinal tension of the anchor rod body overcomes the disadvantage that the tensile capacity of the rock and soil is far lower than its compressive capacity. Anchor rods are the most basic component of tunnel support in contemporary underground mining. They bind the surrounding rock of the tunnel together so that the surrounding rock supports itself. Anchor rods are not only used in mines, but also in engineering technology to actively reinforce slopes, tunnels, dams, etc. As a tensile member deep in the stratum, the anchor rod is connected to the engineering structure at one end and deep in the stratum at the other end. The whole anchor rod is divided into a free section and an anchoring section. The free section refers to the area where the tension at the anchor rod head is transmitted to the anchor body. Its function is to apply prestress to the anchor rod.

[0003] In the anchor construction process, it is necessary to first use a drill rig and a drill rod to drill the anchor hole. In order to increase the pull-out resistance of the anchor, a special extrusion head is also used to extrude the cavity of the enlarged head in the anchor hole, and then steel bars are placed in the anchor hole. Finally, grouting is performed to solidify the anchor with an enlarged head.

[0004] Factors that affect the pull-out resistance of anchor rods include: anchor length of anchor rod, effective diameter of anchor rod, and ultimate bonding strength parameters between rock and soil layer and anchor body. For example, in foundation pit or anti-floating anchor rod construction, according to the working conditions of rock and soil layer, the hole diameter is designed to be φ100mm~φ200mm, and the design length of anchor rod is usually 10m~50m; if the length and diameter of anchor rod are increased too much, the economic cost will be significantly increased, so the effect of improving the pull-out resistance of anchor rod by increasing the anchor length and effective diameter of anchor rod is limited; and the pull-out resistance between the steel bar body of anchor rod and anchor body (such as mortar concrete) is usually much greater than the pull-out resistance between anchor rod anchor body and rock and soil layer, so the pull-out resistance of anchor rod depends on the bonding strength between anchor rod anchor body and rock and soil layer; when the working conditions of rock and soil layer are poor, the relevant technology often forms an anchor rod enlarged head by enlarging the hole head through the reaming drill rod, so as to increase the pull-out resistance of anchor rod.

[0005] In the above-mentioned related technologies, the design of the anchor rod enlarged head does not significantly increase the pull-out resistance of the anchor rod; if the pull-out resistance of the anchor rod is further improved by increasing the size of the anchor rod, the construction cost will be greatly increased. Utility Model Content

[0006] In order to improve the pull-out resistance of the anchor rod and reduce its construction cost, the present application provides a hole-reaming drill rod for anchor hole construction.

[0007] The expansion drill rod for anchor hole construction provided in this application adopts the following technical solution:

[0008] A hole-reaming drill rod for anchor hole construction, comprising at least two detachably connected rod bodies, one end of each of the rod bodies being an insertion rod section with external threads, and the other end of the rod body being a sleeve section with internal threads; the external threads on the insertion rod section can match the internal threads on the sleeve section, and the insertion rod section of the rod body is threadedly connected to the sleeve section of another adjacent rod body;

[0009] The reaming drill rod also includes a reamer, the two ends of which are respectively connected to the ends of two adjacent rod bodies, and the middle of the reamer has a deformation part; when two adjacent rod bodies rotate relative to each other and undergo axial displacement, the deformation parts of the reamer corresponding to the two rod bodies can undergo radial deformation.

[0010] In this application, the length of each rod body is set and processed according to the standard value, and the overall length of the reaming drill rod is set according to the working conditions of the rock and soil layer, so that the specific number of rod bodies required can be calculated. Multiple rod bodies are connected in sequence. In this application, the plug-in rod section of one rod body is inserted into the sleeve section of another adjacent rod body. The two are threadedly connected through the external thread on the plug-in rod section and the internal thread on the sleeve section, which is easy to assemble and has a stable connection.

[0011] In the present application, a hole reamer is arranged between two adjacent rod bodies. By adopting the above-mentioned technical scheme, when the rod body of the drill pipe is rotated, the two adjacent rod bodies will rotate relative to each other and cause axial displacement. At this time, the deformation portion of the hole reamer between the two will undergo radial deformation, thereby expanding its outer diameter. When the hole reamer rotates with the rod body, the protruding part of the deformation portion of the hole reamer will cut the surrounding soil to form a plurality of expanded holes in the middle of the waist. Finally, a convex portion will appear in the middle of the anchor formed by the mortar after grouting, i.e., a structure of partially expanding the anchor rod body will be formed. These convex portions are embedded in the rock and soil layer at intervals, which greatly increases the pull-out resistance of the anchor rod. In this way, the length of the anchor rod can be appropriately reduced, the construction difficulty can be reduced, and the construction cost can be reduced.

[0012] Optionally, the reamer includes a first ring and a second ring, and the first ring and the second ring are respectively mounted on two adjacent ends of the rod body; the deformation portion between the first ring and the second ring includes a plurality of first connecting rods and a plurality of second connecting rods, and the first connecting rods and the second connecting rods are arranged in a one-to-one correspondence; one end of the first connecting rod is hinged to the first ring, one end of the second connecting rod is hinged to the second ring, and the other end of the first connecting rod is hinged to the other end of the corresponding second connecting rod.

[0013] By adopting the above technical solution, the first connecting rod and the second connecting rod form a two-rod hinge structure, the connection between the first connecting rod and the second connecting rod forms an obtuse angle, and the connection between the first connecting rod and the second connecting rod protrudes outward, so that a triangular structure is formed between the first connecting rod, the second connecting rod and the rod body. When the rod body rotates, the connection between the first connecting rod and the second connecting rod rotates accordingly to cut the surrounding soil, thereby forming an expanded hole.

[0014] The first connecting rods are all connected to the first rings, the second connecting rods are all connected to the second rings, and the first rings and the second rings are sleeved on the rod body, which facilitates the assembly of the entire reaming drill rod; at the same time, the first rings and the second rings are driven to move relative to each other by the two adjacent drill rods, and the inclination angles of all the first connecting rods and the second connecting rods can also be driven to change synchronously, which is more stable and reliable.

[0015] Optionally, all the first connecting rods are evenly spaced apart along the circumference of the first ring, and all the second connecting rods are evenly spaced apart along the circumference of the second ring; and the number of the first connecting rods and the second connecting rods is at least four.

[0016] By adopting the above technical solution, the number of the first connecting rod and the second connecting rod is sufficient to form more cutting edges, and these cutting edges are evenly spaced along the circumference of the rod body. In this way, when cutting the surrounding soil, the force is more uniform, the hole expansion work efficiency is high, and the first connecting rod and the second connecting rod are not easy to deform and have a long service life.

[0017] Optionally, the first ring is fixed with a plurality of first connecting blocks at intervals along the circumferential direction, and a connecting shaft is arranged between each adjacent two first connecting blocks; the second ring is fixed with a plurality of second connecting blocks at intervals along the circumferential direction, and a connecting shaft is also arranged between each adjacent two second connecting blocks; the end of the first connecting rod and the end of the second connecting rod are connected to corresponding connecting shafts.

[0018] By adopting the above technical solution, the end of the first connecting rod and the end of the second connecting rod are connected to the corresponding connecting shaft. When the deformation part is deformed, the swing of the first connecting rod and the second connecting rod is more stable and reliable and not easy to get stuck.

[0019] Optionally, the cross-sections of the first connecting rod and the second connecting rod are both rectangular, the width of the first connecting rod is greater than the width of the second connecting rod, the end of the first connecting rod has a groove extending inward from its end face along the length direction, a hinge shaft is arranged between the two side walls of the groove, and the end of the second connecting rod extends into the corresponding groove of the first connecting rod and is connected to the hinge shaft.

[0020] By adopting the above technical solution, the connection between the first connecting rod and the second connecting rod is more stable and reliable, and the connection between the two serves as the main chip cutting blade component. By installing the hinge shaft in the groove, it can play a certain protective role, reduce the probability of damage, and effectively prevent the first connecting rod and the second connecting rod from getting stuck.

[0021] Optionally, the first ring is provided with a first annular step surface, the first connecting block is located on the first step surface, and the outer side surface of one end of the first connecting rod connected to the connecting shaft is lower than the outer circumferential surface of the first ring; the second ring is provided with a second annular step surface, the second connecting block is located on the second step surface, and the outer side surface of one end of the second connecting rod connected to the connecting shaft is lower than the outer circumferential surface of the second ring.

[0022] By adopting the above technical solution, when a hole is formed by using a drill rod, the first connecting rod and the second connecting rod are prevented from affecting the forming of the hole as much as possible, thereby ensuring construction efficiency.

[0023] Optionally, an annular protrusion is provided on the outer circumferential surface of both ends of the rod body; the outer diameter of the annular protrusion is larger than the inner diameter of the first ring and the second ring.

[0024] By adopting the above technical solution, the first ring and the second ring are directly put on the two adjacent rod bodies and respectively abut against the corresponding side surfaces of the annular protrusions. When the two adjacent rod bodies move axially, the annular protrusions can push the first ring and the second ring to move, thereby driving the deformation part of the reamer to deform, thereby forming a structure for partially enlarging the anchor rod body.

[0025] Optionally, the length of the rod body is 1.5m to 2.5m, and the diameter of the rod body is φ100mm to φ200mm.

[0026] By adopting the above technical solution, the rod body is easy to process and assemble, which is more economical while ensuring the pull-out resistance of the anchor rod.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The hole enlargement drill rod in this application is used after the anchor rod is constructed and before grouting, which can increase the hole enlargement working conditions. A convex part will be generated in the middle of the anchor rod formed after grouting, that is, a structure of partially enlarging the anchor rod body is formed. These convex parts are embedded in the rock and soil layer at intervals, which greatly increases the pull-out resistance of the anchor rod.

[0029] 2. After the hole is expanded, the expanded drill rod in the present application forms an anchor rod with better pull-out resistance, which can appropriately reduce the length of the anchor rod, reduce the construction difficulty, and save construction costs.

[0030] 3. In the present application, the first connecting rod and the second connecting rod form a two-rod hinge structure, and the connection between the first connecting rod and the second connecting rod forms an obtuse angle. The connection between the first connecting rod and the second connecting rod protrudes outward, so that a triangular structure is formed between the first connecting rod, the second connecting rod and the rod body, which is more stable and reliable.

[0031] 4. The first connecting rod and the second connecting rod in the present application are provided in several groups and are evenly spaced and distributed along the circumference of the rod body. Thus, when cutting the surrounding soil, the force is more evenly distributed and the hole expansion efficiency is high. In addition, the first connecting rod and the second connecting rod are not easily deformed and have a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of the reaming drill rod in this application.

[0033] Figure 2 yes Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0034] Figure 3 yes Figure 1 Schematic diagram of the local enlarged structure at point B in the middle.

[0035] Figure 4 It is a schematic diagram of the three-dimensional structure of the anchor rod formed after the hole is expanded and drilled into a hole in the present application.

[0036] In the figure:

[0037] 10. Rod body; 11. Rod insertion section; 12. Sleeve section; 13. Annular protrusion;

[0038] 20. reamer; 21. deformation part; 211. first connecting rod; 2111. groove; 212. second connecting rod; 22. first collar; 221. first step surface; 222. first connecting block; 23. second collar; 231. second step surface; 232. second connecting block;

[0039] 30. Connecting shaft;

[0040] 40. Articulated shaft. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1 -Attached Figure 4 , further details of this application are given.

[0042] Reference Figure 1As shown, the reaming drill rod used for anchor hole construction in the present application includes at least two detachably connected rod bodies 10, and the length and diameter of each rod body 10 are set and processed according to the pre-designed standard values. In the present application, the length range of the rod body 10 is 1.5m to 2.5m, and the diameter range of the rod body 10 is φ100mm to φ200mm; specifically, the length specification of the rod body 10 can be 1.5m, 1.8m, 2.0m or 2.5m, and the diameter specification of the rod body 10 can be φ100mm, φ150mm or φ200mm; this size setting has a wide range of applications. The overall length of the reaming drill rod is set according to the working conditions of the rock and soil layer, so that the specific number of rod bodies 10 required can be calculated; in the present application, four sections of rod bodies 10 are taken as an example, and the four rod bodies 10 are connected in sequence.

[0043] Reference Figure 2 and Figure 3 As shown, one end of each rod body 10 is defined as an insertion rod section 11, and the outer peripheral surface of the insertion rod section 11 has an external thread, and the other end of the rod body 10 is defined as a sleeve section 12, and the inner wall of the sleeve section 12 has an internal thread; the external thread on the insertion rod section 11 matches the internal thread on the sleeve section 12, and when two adjacent rod bodies 10 are connected, the insertion rod section 11 of the rod body 10 is screwed into the sleeve section 12 of the other adjacent rod body 10, and the two are threadedly connected by matching the external thread on the insertion rod section 11 with the internal thread on the sleeve section 12, which is easy to assemble and has a stable connection.

[0044] Reference Figure 2 and Figure 3As shown, a reamer 20 is arranged between every two adjacent rod bodies 10, and the two ends of the reamer 20 are respectively connected to the ends of the two adjacent rod bodies 10, and the middle part of the reamer 20 has a deformation part 21; when the two adjacent rod bodies 10 rotate relative to each other and cause axial displacement, the deformation part 21 of the reamer 20 corresponding to the two rod bodies can undergo radial deformation. Specifically, in the present application, the reamer 20 includes a first ring 22 and a second ring 23, and the first ring 22 and the second ring 23 are respectively sleeved on the ends of two adjacent rod bodies 10; the deformation portion 21 between the first ring 22 and the second ring 23 includes a plurality of first connecting rods 211 and a plurality of second connecting rods 212. In the present application, the number of the first connecting rods 211 and the second connecting rods 212 is at least 4, and the number of the first connecting rods 211 and the second connecting rods 212 can be 4, 8 or 16. All the first connecting rods 211 are evenly spaced along the circumference of the first ring 22, and all the second connecting rods 212 are evenly spaced along the circumference of the second ring 23. The first connecting rods 211 and the second connecting rods 212 are arranged in a one-to-one correspondence; one end of the first connecting rod 211 is hinged on the first ring 22, one end of the second connecting rod 212 is hinged on the second ring 23, and the other end of the first connecting rod 211 is hinged to the other end of the corresponding second connecting rod 212. The first connecting rod 211 and the second connecting rod 212 form a two-rod hinge structure, and the connection between the first connecting rod 211 and the second connecting rod 212 forms an obtuse angle. The connection between the first connecting rod 211 and the second connecting rod 212 protrudes outward, so that a triangular structure is formed between the first connecting rod 211, the second connecting rod 212 and the rod body 10. When the rod body 10 rotates, the connection between the first connecting rod 211 and the second connecting rod 212 rotates accordingly to cut the surrounding soil, thereby forming an expanded hole.

[0045] Reference Figure 2 and Figure 3 As shown, the first ring 22 is provided with an annular first step surface 221, and a plurality of first connecting blocks 222 are fixedly provided at the first step surface 221 of the first ring 22 at intervals in the circumferential direction, and a connecting shaft 30 is provided between each adjacent two first connecting blocks 222; the second ring 23 is provided with an annular second step surface 231, and a plurality of second connecting blocks 232 are fixedly provided at the second step surface 231 of the second ring 23 at intervals in the circumferential direction, and a connecting shaft 30 is also provided between each adjacent two second connecting blocks 232; the end of the first connecting rod 211 and the end of the second connecting rod 212 are connected to the corresponding connecting shaft 30; the outer side surface of one end of the first connecting rod 211 connected to the connecting shaft 30 is lower than the outer peripheral surface of the first ring 22, and the outer side surface of one end of the second connecting rod 212 connected to the connecting shaft 30 is lower than the outer peripheral surface of the second ring 23.

[0046] Annular protrusions 13 are provided on the outer circumferential surfaces at both ends of the rod body 10; the outer diameter of the annular protrusion 13 is larger than the inner diameter of the first ring 22 and the second ring 23; the first ring 22 and the second ring 23 are directly sleeved on the two adjacent rod bodies 10 and respectively abut against the corresponding side surfaces of the annular protrusions 13. When the two adjacent rod bodies 10 move axially, the annular protrusions 13 can push the first ring 22 and the second ring 23 to move, thereby driving the deformation part 21 of the reamer 20 to deform, thereby forming a structure for partially enlarging the anchor rod body.

[0047] Reference Figure 2 and Figure 3 As shown, the cross-sections of the first connecting rod 211 and the second connecting rod 212 are both rectangular, the width of the first connecting rod 211 is greater than the width of the second connecting rod 212, the end of the first connecting rod 211 has a groove 2111 extending inward from its end face along the length direction, and a hinge shaft 40 is arranged between the two side walls of the groove 2111, and the end of the second connecting rod 212 extends into the corresponding groove 2111 of the first connecting rod 211 and is connected to the hinge shaft 40; the connection between the first connecting rod 211 and the second connecting rod 212 serves as the main chip cutting blade component, and by installing the hinge shaft 40 in the groove 2111, it can play a certain protective role, reduce the probability of damage, and effectively prevent the first connecting rod 211 and the second connecting rod 212 from getting stuck.

[0048] The implementation principle is as follows: in the anchor construction process, the hole expansion drill rod in the present application is first installed on the drilling rig, the anchor hole is drilled using the drilling rig and the drill rod, and then steel bars are placed in the anchor hole, and finally grouting is performed to solidify the anchor.

[0049] In the process of drilling holes using the reaming drill rod in the present application, an reaming condition is added after the anchor rod is constructed to form the hole and before grouting. Since a hole reamer 20 is arranged between two adjacent rod bodies 10, when the rod body 10 of the drill pipe is rotated, the two adjacent rod bodies 10 will rotate relative to each other and cause axial displacement. At this time, the deformation portion 21 of the hole reamer 20 between the two will undergo radial deformation, thereby expanding its outer diameter. When the hole reamer 20 rotates along with the rod body 10, the protruding part of the deformation portion 21 of the hole reamer 20 will cut the surrounding soil to form a plurality of expanded holes in the middle of the waist. Finally, a convex portion will be generated in the middle of the anchor formed by the mortar after grouting, i.e., a structure of partially expanding the anchor rod body is formed. These convex portions are embedded in the rock and soil layer at intervals. Compared with the traditional structure without expanding holes or only expanding holes at the bottom of the anchor rod to form an anchor rod head, the locally expanded anchor rod body structure finally formed in the present application greatly increases the pull-out resistance of the anchor rod and improves the use efficiency of the anchor rod. In this way, the anchor rod length can be appropriately reduced, the construction difficulty can be reduced, the construction cost can be reduced, and huge economic benefits can be generated while meeting the requirements of the on-site construction nodes.

[0050] As an alternative, the reamer 20 in the present application includes a first ring 22, a second ring 23 and a deformable steel wire mesh connected between the first ring 22 and the second ring 23. When the first ring 22 and the second ring 23 move toward each other, the deformable steel wire mesh can be squeezed to deform, and the radial size of the middle waist becomes larger.

[0051] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A reaming drill rod for anchor hole construction, comprising at least two detachably connected rod bodies (10), one end of each of the rod bodies (10) being an inserting rod section (11) having an external thread, and the other end of the rod body (10) being a sleeve section (12) having an internal thread; the external thread on the inserting rod section (11) and the internal thread on the sleeve section (12) being able to match, and the inserting rod section (11) of the rod body (10) being threadedly connected to the sleeve section (12) of another adjacent rod body (10); characterized in that: The reaming drill rod further comprises a reamer (20), the two ends of the reamer (20) being respectively connected to the ends of two adjacent rod bodies (10), and the middle portion of the reamer (20) having a deformation portion (21); when the two adjacent rod bodies (10) rotate relative to each other and undergo axial displacement, the deformation portion (21) of the reamer (20) corresponding to the two adjacent rod bodies (10) can undergo radial deformation; The reamer (20) comprises a first ring (22) and a second ring (23), wherein the first ring (22) and the second ring (23) are respectively sleeved on the ends of two adjacent rod bodies (10); the deformation portion (21) between the first ring (22) and the second ring (23) comprises a plurality of first connecting rods (211) and a plurality of second connecting rods (212), wherein the first connecting rods (211) and the second connecting rods (212) are arranged in a one-to-one correspondence; one end of the first connecting rod (211) is hinged on the first ring (22), one end of the second connecting rod (212) is hinged on the second ring (23), and the other end of the first connecting rod (211) is hinged to the other end of the corresponding second connecting rod (212).

2. The expansion drill rod for anchor hole construction according to claim 1, characterized in that: All the first connecting rods (211) are evenly spaced and distributed along the circumference of the first ring (22), and all the second connecting rods (212) are evenly spaced and distributed along the circumference of the second ring (23); the number of the first connecting rods (211) and the second connecting rods (212) is at least four.

3. The reaming drill rod for anchor hole construction according to claim 1 or 2, characterized in that: The first ring (22) is fixedly provided with a plurality of first connecting blocks (222) at intervals along the circumferential direction, and a connecting shaft (30) is arranged between each adjacent two first connecting blocks (222); the second ring (23) is fixedly provided with a plurality of second connecting blocks (232) at intervals along the circumferential direction, and a connecting shaft (30) is also arranged between each adjacent two second connecting blocks (232); the end of the first connecting rod (211) and the end of the second connecting rod (212) are connected to the corresponding connecting shafts (30).

4. The expansion drill rod for anchor hole construction according to claim 3, characterized in that: The cross-sections of the first connecting rod (211) and the second connecting rod (212) are both rectangular, the width of the first connecting rod (211) is greater than the width of the second connecting rod (212), the end of the first connecting rod (211) has a groove (2111) extending inward from its end face along the length direction, a hinge shaft (40) is arranged between the two side walls of the groove (2111), and the end of the second connecting rod (212) extends into the corresponding groove (2111) of the first connecting rod (211) and is connected to the hinge shaft (40).

5. The hole enlarging drill rod for anchor hole construction according to claim 3, characterized in that: The first collar (22) is provided with an annular first step surface (221), the first connecting block (222) is located on the first step surface (221), and the outer side surface of one end of the first connecting rod (211) connected to the connecting shaft (30) is lower than the outer peripheral surface of the first collar (22); the second collar (23) is provided with an annular second step surface (231), the second connecting block (232) is located on the second step surface (231), and the outer side surface of one end of the second connecting rod (212) connected to the connecting shaft (30) is lower than the outer peripheral surface of the second collar (23).

6. The reaming drill rod for anchor hole construction according to claim 1 or 2, characterized in that: Annular protrusions (13) are provided on the outer circumferential surfaces at both ends of the rod body (10); the outer diameter of the annular protrusion (13) is larger than the inner diameter of the first ring (22) and the second ring (23).

7. The expansion drill rod for anchor hole construction according to claim 1 or 2, characterized in that: The length of the rod body (10) is 1.5 m to 2.5 m, and the diameter of the rod body (10) is φ100 mm to φ200 mm.

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