Roadway anchor rod centered damping and screw-in mounting device

Abstract

The utility model provides a roadway anchor rod centered damping and screw-in installation device which comprises at least two centered damping assemblies arranged on an anchor rod in a sleeved mode, each centered damping assembly comprises a plurality of blade-shaped supporting bodies and an inner ring pad, the anchor rod is supported through the arrangement of the supporting bodies, and the inner ring pads are arranged on the supporting bodies. Anchor rods with different diameters and specifications are located in the center of a drill hole after being installed in the anchor rod holes, and the stress area and displacement damping of the anchor rods in the propelling process are increased; the screw-in mounting assembly comprises a positioning foot plate, a conical funnel, a quick anchor rod clamp and four supporting rods, and the anchor rod penetrates through the quick anchor rod clamp, the conical funnel and a round hole formed in the center of the positioning foot plate to be inserted into an anchor rod hole; pressure and torque are applied to the anchor rod in the anchor rod mounting process, so that the anchor rod enters an anchor rod hole in a rotating state, the centering degree and the pull-out resistance of the anchor rod in the anchor rod hole are improved, and the anchoring force of the anchor rod is increased.

Description

Technical Field

[0001] The utility model belongs to the field of tunnel support, and particularly relates to a tunnel anchor center damping and screw-in installation device and a construction and installation method. Background Art

[0002] In engineering fields such as tunnel construction and mining, mortar rock anchor-grit shotcrete joint support has the advantages of low cost, low construction technology requirements, low construction difficulty and good long-term support effect. With the construction of deep mineral mining and mountain tunnels, the high ground pressure disturbance environment on the actual site has put forward higher requirements on the anchor support capacity. The factors that restrict the support strength of the anchor support system can be roughly divided into the strength of the anchor itself, the strength of the mortar, the bonding effect and shear strength of the anchor-slurry interface, and the bonding effect and shear strength of the slurry-rock interface. How to increase the overall shear strength of the combination of rock-slurry-rod is the key to improving the support strength of the anchor support system.

[0003] In actual on-site projects, full-length mortar anchors have the advantages of convenient construction and good force homogeneity. In indoor experiments, it has been proven that anchor eccentricity has a significant impact on the pull-out strength of anchors. In mineral development, tunnel construction and other companies' ground / rock anchor construction specifications, corresponding requirements are put forward for anchor centering. Effective measures must be taken during the installation and construction of long anchors to ensure that the anchors are installed in the center. The current anchor centering installation method is to install a guide ring on the anchor, but the guide ring centering method with a fixed aperture cannot be well adapted to on-site construction. After drilling, the long anchor holes on site are easily dislocated, fall off, and shrink in weak structural surfaces and broken zones due to the influence of ground stress redistribution, which hinders the normal advancement of the anchors after the installation of conventional centering devices.

[0004] It can be seen that how to solve the requirements for the centering, construction convenience and overall pull-out strength of the anchor rod raised during the on-site engineering construction process, provide pull-out damping while ensuring the centering of the anchor rod, improve the pull-out strength of the anchor rod in the anchor rod hole, and increase the anchoring force of the anchor rod are technical problems that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a tunnel anchor centering damping and screw-in installation device to at least solve one of the above technical problems.

[0006] In order to solve the above technical problems, the utility model provides a tunnel anchor centering damping and screw-in installation device, which is used for centering the anchor into the anchor hole, the anchor hole is opened on the tunnel wall, the centering damping and screw-in installation device comprises: at least two centering damping components, each of the centering damping components comprises a plurality of blade-shaped support bodies and inner ring pads, a plurality of the support bodies are fixed around the outer side of the inner ring pad at intervals; the inner ring pad is sleeved and fixed on the anchor; an installation component, the installation component comprises a positioning foot plate, a conical funnel, a quick anchor clamp and four support rods, the center of the positioning foot plate A circular hole is opened, and the circular hole is aligned with the anchor hole, and the positioning foot plate is fixedly connected to the tunnel wall; wherein, the top surface of the positioning foot plate is fixedly connected with four first ball joint supports evenly distributed around the center of the positioning foot plate, the front end of the conical funnel passes through the circular hole and is installed on the anchor hole, one end of the four support rods is respectively hinged to the four first ball joint supports, and the other ends of the four support rods are respectively hinged to the quick anchor clamp, and a propulsion channel is provided in the middle of the quick anchor clamp, and the anchor rod passes through the propulsion channel and the conical funnel and is inserted into the anchor hole.

[0007] In the first aspect, optionally, the inner side surface of the inner ring gasket is provided with at least two first grooves opened along the circumference direction of the inner ring gasket, and the inner side surface is the side in contact with the anchor rod.

[0008] In the first aspect, optionally, a plurality of bolt holes are provided on the positioning foot plate, and the positioning foot plate is fastened to the tunnel wall by bolts.

[0009] In the first aspect, optionally, the quick anchor clamp includes two hingedly connected jaws, and both of the two jaws are semicircular structures, so that the relative arrangement of the semicircular structures of the two jaws forms the propulsion channel.

[0010] In the first aspect, optionally, the inner side surfaces of the two clamps are provided with protruding teeth, and the outer side surfaces of the two clamps are fixedly connected to two evenly distributed second ball joint supports; wherein the distribution angles of the four second ball joint supports are consistent with the distribution angles of the four first ball joint supports.

[0011] In the first aspect, optionally, the support rod is arc-shaped, and ball heads are provided at both ends of the support rod, and the two ball heads are respectively hinged to the first ball joint support and the second ball joint support; wherein the two ball heads are oriented in the same direction.

[0012] In the first aspect, optionally, the diameter of the front end of the conical funnel is not larger than the diameter of the anchor hole and not smaller than the diameter of the anchor; the diameter of the rear end of the conical funnel is not smaller than the maximum diameter of several of the support bodies and the inner ring pad.

[0013] In the first aspect, optionally, the diameter of the circular hole is larger than the diameter of the anchor hole.

[0014] In the first aspect, optionally, a second groove is formed on the outer side of the anchor rod, and the inner ring gasket is bonded to the second groove.

[0015] In the first aspect, optionally, the width of the second groove is greater than the width of the inner ring gasket, and the opening depth of the second groove is between 1 / 2 and 3 / 2 of the thickness of the inner ring gasket.

[0016] In a second aspect, this embodiment provides a method for constructing and installing a tunnel anchor rod, which is implemented based on the tunnel anchor rod centering damping and screw-in installation device as described in any one of the embodiments of the present application, and the method includes the steps of:

[0017] S1. Selecting a location area on the anchor rod for installing the central damping assembly, and opening a second groove in the location area; the width of the second groove is greater than the width of the central damping assembly, and the depth of the second groove is between 1 / 2 and 3 / 2 of the thickness of the inner ring gasket;

[0018] S2, thickly coating the chemical anchor resin adhesive in the second groove, placing the central damping component in a ring shape in the second groove, pressing it flat, removing excess resin adhesive and waiting for curing;

[0019] S3, drilling holes around the anchor hole, installing four expansion screws, fixing the positioning foot plate to the tunnel wall where the anchor hole is located, so that the circular hole opened at the center of the positioning foot plate corresponds to the anchor hole;

[0020] S4, hinge one end of the four support rods to four ball joint supports welded on the positioning foot plate, and hinge the other ends of the four support rods to the quick anchor clamp;

[0021] S5, inserting the front end of the conical funnel through the circular hole into the anchor hole, and the front part of the anchor sequentially passes through the advancement channel of the quick anchor fixture and the conical funnel to be inserted into the anchor hole;

[0022] S6, twisting the support rod and the quick anchor clamp by 10 degrees along the rotation direction of the support body in the central damping assembly;

[0023] S7, pulling up the quick anchor rod clamp outward along the axial direction of the circular hole, clamping the anchor rod with the quick anchor rod clamp, and avoiding the central damping assembly;

[0024] S8, using a heavy object to hit the rear of the anchor rod to advance the anchor rod;

[0025] S9, loosening the quick anchor clamp;

[0026] S10. Repeat steps S7, S8, and S9 until the anchor rod is pushed to a specified depth.

[0027] In the second aspect, optionally, the number of the support bodies is set according to the length and diameter of the anchor rod, and the number of the support bodies is not less than 8 and not more than 24; a plurality of the support bodies are evenly distributed around the outer surface of the inner ring pad at an inclined angle.

[0028] In the second aspect, optionally, at least two of the central damping assemblies are mounted on the anchor rod; the number of the central damping assemblies is arranged according to the length and diameter of the anchor rod, and the spacing distance between two adjacent central damping assemblies is not greater than 1000 mm and not less than 250 mm.

[0029] Beneficial effects:

[0030] The utility model proposes a tunnel anchor centering damping and screw-in installation device, comprising at least two centering damping components and a screw-in installation component, each centering damping component comprising a plurality of blade-shaped support bodies and inner ring pads, the support bodies are arranged to support the anchor rods, so as to ensure that anchor rods of different diameters and specifications are located at the center of the drill hole after being installed into the anchor rod hole, thereby increasing the force bearing area and displacement damping of the anchor rod during the advancement process; since the installation and operation of the centering damping component in the actual on-site construction process requires the use of a rotary advancement process, a screw-in installation component is also designed, comprising a positioning foot plate, a conical funnel, a quick anchor rod clamp and four support rods, when in use, the anchor rods are respectively inserted into the anchor rod hole through the quick anchor rod clamp, the conical funnel and the circular hole opened in the center of the positioning foot plate, so as to achieve the application of pressure and torque to the anchor rod during the installation of the anchor rod so that the anchor rod enters the anchor rod hole in a rotating state, thereby improving the rotation ability of the anchor rod, and improving the centering, stability and advancement efficiency of the anchor rod advancing into the anchor rod hole.

[0031] The present application is easy to process as a whole, is convenient for on-site construction, and is highly practical. It can adapt to anchor rods of different sizes and different anchor hole diameters, and can adapt to irregular deformations in anchor holes, and can keep the anchor rod centered and stable regardless of when large deformations occur in the surrounding rock in the early stage or after the initial deformation period of the surrounding rock. At the same time, through the setting of the centered damping component, a gap is reserved when the anchor rod enters the anchor hole to meet the grouting flow filling requirements, so as to improve the centering degree of the anchor rod in the anchor hole, improve the overall pull-out resistance of the anchor rod, and increase the anchoring force of the anchor rod.

[0032] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a structural schematic diagram of the combined construction of the anchor rod, the center damping assembly and the screw-in installation assembly in the embodiment of the utility model;

[0035] Figure 2 This is a schematic structural diagram of a central damping assembly in an embodiment of the utility model;

[0036] Figure 3 This is a structural schematic diagram of a screw-in installation assembly in an embodiment of the utility model;

[0037] Figure 4 This is a structural schematic diagram of a screw-in installation assembly in an embodiment of the utility model;

[0038] Figure 5 This is a schematic diagram of the structure of the quick installation fixture in the embodiment of the utility model;

[0039] Figure 6 This is a schematic diagram of the structure of the support rod in the embodiment of the utility model;

[0040] Figure 7 This is a schematic diagram of the improved structure of the TBS12 type ball head rod end joint bearing in the embodiment of the utility model;

[0041] Figure 8 This is a flow chart of the steps of the method for constructing and installing a tunnel anchor rod in an embodiment of the utility model;

[0042] Reference numerals:

[0043] 1—anchor rod;

[0044] 2—Center damping assembly;

[0045] 21 - support body;

[0046] 22—inner ring gasket;

[0047] 221 — first groove;

[0048] 3—Screw in the installation assembly;

[0049] 31—positioning foot plate;

[0050] 311—round hole;

[0051] 312—first ball joint support;

[0052] 313—bolt hole;

[0053] 32—conical funnel;

[0054] 33—Quick anchor clamp;

[0055] 331—Advance channel;

[0056] 332—gripper;

[0057] 333—Hinge;

[0058] 334—convex teeth;

[0059] 335—second ball joint support;

[0060] 34—support rod; DETAILED DESCRIPTION

[0061] Embodiment 1:

[0062] like Figure 1As shown, the present embodiment 1 provides a tunnel anchor center damping and screw-in installation device for stably centering the anchor 1 into the anchor hole, the anchor hole is opened on the tunnel wall, the center damping and screw-in installation device comprises: at least two center damping components 2, each center damping component 2 comprises a plurality of blade-shaped support bodies 21 and an inner ring pad 22, a plurality of support bodies 21 are fixed around the outer side surface of the inner ring pad 22 at intervals, and the inner ring pad 22 is sleeved and fixed on the anchor 1; screw-in installation component 3, the screw-in installation component 3 comprises a positioning foot plate 31, a conical funnel 32, a quick anchor clamp 33 and four support rods 34, the positioning foot plate 31 A circular hole 311 is opened in the center, and the circular hole 311 is aligned with the anchor hole. The positioning foot plate 31 is fixedly connected to the wall of the tunnel; wherein, the top surface of the positioning foot plate 31 is fixedly connected with four first ball joint supports 312 evenly distributed around the center of the positioning foot plate 31, and the front end of the conical funnel 32 passes through the circular hole 311 and is installed on the anchor hole, and one end of the four supporting rods 34 is respectively hinged to the four first ball joint supports 312, and the other ends of the four supporting rods 34 are respectively hinged to the quick anchor clamps 33, and a propulsion channel 331 is provided in the middle of the quick anchor clamp 33, and the anchor 1 passes through the propulsion channel 331 and the conical funnel 32 to be inserted into the anchor hole.

[0063] Specifically, the first embodiment of the utility model proposes a tunnel anchor center damping and screw-in installation device, comprising at least two center damping components 2, the working principle of the center damping component 2 is: by setting at least two groups of propeller-type blade-shaped support bodies 21 to support the anchor in the anchor hole, the centering degree of the anchor 1 is ensured, and the anchor 1 is prevented from falling directly on the inner wall of the anchor hole to reduce the bearing capacity; the designed center damping component 2 also participates in the force in the subsequent force process of the anchor 1, and by increasing the roughness of the bonding surface between the anchor and the grouting mortar and the mechanical damping method, the mortar anchor 1 still has a high residual tension after exceeding the allowable tension value, so as to achieve the purpose of common force of the mortar and the anchor 1, and ensure that the mortar anchor support system has a large support force on the rock wall for a long time, so that after the mortar in the anchor hole is broken due to the large deformation of the surrounding rock in the early stage, the mortar anchor 1 still has a considerable anchoring force, which is sufficient to continue to ensure the stability of the surrounding rock in the relative stability period after the initial deformation period of the surrounding rock;

[0064] Furthermore, the structure and working principle of the center damping assembly 1 require the use of a rotational advancement process during the actual on-site construction process. Therefore, in order to solve the construction requirements for the rotational advancement of the anchor rod 1 after the center damping assembly 2 is installed in the actual construction, a corresponding screw-in installation assembly 3 is designed. The screw-in installation assembly 3 includes a positioning foot plate 31, a conical funnel 32, a quick anchor rod clamp 33 and four support rods 34. The positioning foot plate 31 is a stamping plate with a thickness of not less than 15 mm and a diameter of not less than 300 mm. The positioning foot plate 31 is provided with four bolt holes 313 with a diameter of 5 mm. Before installing the positioning foot plate 31, expansion bolt holes should be drilled in advance on the tunnel wall, and the positioning foot plate 31 should be fixed to the tunnel wall by expansion bolts; four first ball joint supports 312 are evenly welded on the positioning foot plate 31, and are hinged to one end of the support rod 34; as a feasible method, such as Figure 7 As shown, the first ball joint support 312 and the ball heads at both ends of the support rod 34 use TBS12 ball head rod end joint bearings (shaft diameter is 12mm, length is 54.5mm, steel ball diameter is 22.23mm), and the TBS12 ball head rod end joint bearing has a 45-degree tilt groove on the side. The groove requirement is to ensure that the support rod 34 can be completely flat during the rotation process (such as Figure 3 As shown), a through circular hole 311 is provided in the center of the positioning foot plate 31, the diameter of the hole is slightly larger than the diameter of the anchor hole, and is used to facilitate the installation of the subsequent anchor 1 with a steel conical funnel 32; wherein the conical funnel is made of a 1.5 mm thick steel sheet bent into a cone;

[0065] In this way, the positioning foot plate 31, the conical funnel 32, the quick anchor rod clamp 33 and the support rod 34 are installed in combination, and the first ball joint support 312 is hinged with the ball head of the support rod 34. During the installation process, the support rod 34 and the quick anchor rod clamp 33 need to be twisted 10 degrees along the rotation direction of the blade-shaped support body 21 in advance, so that the anchor rod 1 can be rotated in the pre-twisted direction during the subsequent installation process of pushing the anchor rod 1 by a heavy object.

[0066] In some possible implementations, the inner side surface of the inner ring gasket 22 is provided with at least two first grooves 221 opened along the circumference direction of the inner ring gasket 22 , and the inner side surface is the side in contact with the anchor rod 1 .

[0067] Specifically, if Figure 2 As shown, through the opening of the first groove 221, during the installation process, 3 ml of high-strength quick-setting chemical anchor resin adhesive needs to be thickly applied in the first groove 221, pressed flat, and the excess resin adhesive is removed and waited for solidification to bond and fix the inner ring pad 22 to the anchor rod 1.

[0068] In some possible implementations, the quick anchor clamp 33 includes two clamping jaws 332 connected by a hinge 333 , and both clamping jaws 332 are semicircular structures, so that the relative arrangement of the semicircular structures of the two clamping jaws 332 forms a propulsion channel 331 .

[0069] Specifically, if Figure 5 As shown, the quick anchor clamp 33 includes two clamping jaws 332, so as to clamp and fix the anchor through the cooperation of the two clamping jaws 332 and a hinge 333 fastened by bolts.

[0070] In some possible embodiments, the inner side surfaces of the two clamping jaws 332 are provided with protruding teeth 334, and the outer side surfaces of the two clamping jaws 332 are fixedly connected with two evenly distributed second ball joint supports 335; wherein the distribution angles of the four second ball joint supports 335 are consistent with the distribution angles of the four first ball joint supports 312.

[0071] Specifically, if Figure 5 As shown, the inner side surfaces of the two clamping jaws 332 are provided with protruding teeth 334, which cooperate with the hinge 333 fastened with bolts on the outer side to meet the clamping and pushing requirements of anchor rods of different thicknesses and specifications; in addition, the outer surfaces of the two clamping jaws 332 are welded with two second ball hinge supports 335; Figure 7 As shown, the second ball joint support 335 uses a TBS12 ball head rod end joint bearing (shaft diameter 12mm, length 54.5mm, steel ball diameter 22.23mm). The TBS12 ball head rod end joint bearing has a 45-degree tilt groove on the side. The groove requirement is to ensure that the support rod 34 can be completely flat during the rotation process (such as Figure 3 shown).

[0072] In some possible implementations, the support rod 34 is arc-shaped, and ball heads are provided at both ends of the support rod 34. The two ball heads are respectively hinged to the first ball joint support 312 and the second ball joint support 335; wherein the two ball heads are oriented in the same direction.

[0073] Specifically, if Figure 6 As shown, the support rod 34 is an incomplete S-shaped arc structure, with ball heads at both ends, and is adapted to be hinged with the first ball joint support 312 and the second ball joint support 335; it is required that when the quick anchor clamp 33 is rotated and pressed down to the lowest point, all the support rods 34 rotate to the same plane.

[0074] In some possible implementations, the diameter of the front end of the conical funnel 32 is not larger than the diameter of the anchor hole and not smaller than the diameter of the anchor 1 ; the diameter of the rear end of the conical funnel 32 is not smaller than the maximum diameter of the plurality of supports 21 and the inner ring pad 22 .

[0075] Specifically, the conical funnel 32 is made of steel and is made of 1.5 mm thick steel sheet bent into a cone; the diameter of the front end of the conical funnel 32 is not larger than the diameter of the anchor hole and not smaller than the diameter of the anchor 1, and the diameter of the rear end of the conical funnel 32 is not smaller than the maximum diameter of a plurality of support bodies 21 and the inner ring pad 22; in the process of installing the anchor 1, the front end of the conical funnel 32 is installed at the mouth of the anchor hole through the circular hole 311 opened at the center of the positioning foot plate 31, and the anchor 1 is inserted from the rear end of the conical funnel 32, and the anchor 1 rotates to retract the blade-shaped support body 21 of the center damping assembly 2, and enters the anchor hole from the front end of the conical funnel 32.

[0076] In some possible implementations, a plurality of bolt holes 313 are provided on the positioning foot plate 31 and are fastened to the tunnel wall by bolts; and / or the diameter of the circular hole 311 is greater than the diameter of the anchor hole.

[0077] Embodiment 2:

[0078] like Figure 8 As shown, the second embodiment provides a method for construction and installation of a tunnel anchor rod, which is implemented based on any of the above-mentioned tunnel anchor rod centering damping and screw-in installation devices, and the method includes the steps of:

[0079] S1. Selecting a location area on the anchor rod for installing the central damping assembly, and opening a second groove in the location area; the width of the second groove is greater than the width of the inner ring gasket in the central damping assembly, and the depth of the second groove is between 1 / 2 and 3 / 2 of the thickness of the inner ring gasket;

[0080] S2, thickly coating the chemical anchor resin adhesive in the second groove, placing the inner ring gasket in the second groove, pressing it flat, removing excess resin adhesive and waiting for curing;

[0081] S3, drilling holes around the anchor hole, installing four expansion screws, fixing the positioning foot plate to the tunnel wall where the anchor hole is located, so that the circular hole opened at the center of the positioning foot plate corresponds to the anchor hole;

[0082] S4, hinge one end of the four support rods to four ball joint supports welded on the positioning foot plate, and hinge the other ends of the four support rods to the quick anchor clamp;

[0083] S5, inserting the front end of the conical funnel through the circular hole into the anchor hole, and the front part of the anchor sequentially passes through the advancement channel of the quick anchor fixture and the conical funnel to be inserted into the anchor hole;

[0084] S6, twisting the support rod and the quick anchor clamp by 10 degrees along the rotation direction of the support body in the central damping assembly;

[0085] S7, pulling up the quick anchor rod clamp outward along the axial direction of the circular hole, clamping the anchor rod with the quick anchor rod clamp, and avoiding the central damping assembly;

[0086] S8, using a heavy object to hit the rear of the anchor rod to advance the anchor rod;

[0087] S9, loosening the quick anchor clamp;

[0088] S10. Repeat steps S7, S8, and S9 until the anchor rod is pushed to a specified depth.

[0089] Specifically, before installation, a second groove should be pre-opened on the anchor rod, wherein the width of the second groove should be greater than the width of the center damping assembly, and the depth should be between 1 / 2 and 3 / 2 of the thickness of the inner ring gasket, so that the inner ring gasket can be installed in the groove pre-set in the anchor rod by means of a resin-based adhesive. The inner ring gasket is provided with at least two first grooves on the contact surface of the anchor rod to provide sufficient friction, and the bonding between the center damping assembly and the anchor rod is reliable and stable by means of the uneven surface; before using a heavy object to knock on the rear of the anchor rod to advance the anchor rod, the support rod and the quick anchor rod clamp should be rotated along the support body in the center damping assembly The anchor rod is twisted 10 degrees in the forward twisting direction to rotate the anchor rod in the process of advancing the installation; in the process of advancing the anchor rod, the positioning foot plate, the support rod and the quick anchor rod clamp cooperate with each other to rotate the anchor rod along the rotation direction of the several supporting bodies, thereby enhancing the centering degree of the anchor rod in the anchor rod hole, improving the overall anti-pull-out ability of the anchor rod, and increasing the anchoring force of the anchor rod; among them, due to different construction environments, the depth specified in S10 should be specifically determined according to the construction environment and construction requirements during the actual installation and construction process, and the judgment indicators can be the depth of the anchor rod hole, the thickness of the tunnel wall, and anchor rods of different specifications and sizes.

[0090] In some possible implementations, the number of support bodies is set according to the length and diameter of the anchor rod, and the number of support bodies is not less than 8 and not more than 24; a plurality of blades are evenly distributed at an angle and surrounded on the outer surface of the inner ring pad.

[0091] Before selecting and installing center damping assemblies of different specifications, the following should be pre-evaluated based on the diameter and length of the anchor rod and relevant experience: 1. The number of blade-shaped supports in the center damping assembly installed on each anchor rod; 2. The number and position of the center damping assemblies 2 installed on each anchor rod.

[0092] Specifically, the number of supports shall be increased according to the length and diameter of the anchor rod, not less than 8 pieces and not more than 24 pieces; among them, the material of the blade-shaped supports are low-carbon steel with good elasticity, and the thickness shall not be less than 0.5mm and not more than 1.5mm, and each support body shall be provided with a chamfer, and it is required to have the ability to reduce the relative diameter of the blade-shaped support body under the stress deformation when the anchor rod is rotated, and to pass through the contraction section in the anchor rod hole by automatically adapting to passing through anchor rod holes of different diameters and passing smoothly under the conditions that the anchor rod hole is dislocated, dropped, and deformed due to weak structural surfaces and broken zones, and to ensure the centering of the anchor rod. There is sufficient space between the blade-shaped supports of the anchor rod centering damping assembly to allow various types of anchor slurries to pass through, including the M30 mortar commonly used in mortar anchor rods anchored in full length.

[0093] In some possible implementations, at least two central damping components are evenly arranged on the anchor rod; the number of central damping components is arranged according to the length and diameter of the anchor rod, and the spacing distance between any two adjacent central damping components is not greater than 1000 mm and not less than 250 mm.

[0094] Specifically, the number of central damping components should be set according to the length and diameter of anchor rods of different specifications and sizes. There should be at least two central damping components on each anchor rod, and the spacing between them should not be greater than 1000mm and not less than 250mm.

[0095] The manufacturing requirements, installation instructions and key points of the center damping assembly are as follows:

[0096] There are two ways to process the center damping component, which are: 1. Overall turning, the processing method is: select a steel sheet with a thickness of 6mm and a width of 10mm, mill out at least two first grooves with a size of 1mm*1mm on one side, use a milling machine to mill out the arc surface on the other side, and use a turning tool to cut out the blade-shaped support body of the designed length and thickness. 2. Process the inner ring gasket and the support body separately, the processing method is: the inner ring gasket uses a steel sheet with a thickness of 3mm and a width of 10mm, and mills out at least two first grooves with a size of 1mm*1mm on one side; the support body uses a steel sheet with a thickness of 1.5mm and a width of 10mm for stamping, and the two are welded into shape. After processing, the blade-shaped support body in the center damping component is folded and pushed into a protective iron box of the same size for packaging to protect the device blades and facilitate transportation; when installing, remove the protective iron box and cut the inner ring gasket to a suitable length and unfold it.

[0097] Since the second embodiment and the first embodiment are embodiments of the same utility model concept and some of their structures are exactly the same, the structures in the second embodiment that are substantially the same as those in the first embodiment will not be elaborated in detail. For the parts not elaborated in detail, please refer to the first embodiment.

[0098] Finally, it should be noted that the above embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiment of the utility model. They should all be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

[0099] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A tunnel anchor centering damping and screwing installation device, used for centering an anchor (1) into an anchor hole, wherein the anchor hole is opened on the tunnel wall, characterized in that: The central damping and precession mounting device comprises: At least two central damping assemblies (2), each of the central damping assemblies (2) comprising a plurality of blade-shaped support bodies (21) and an inner ring pad (22), the plurality of support bodies (21) being fixed around the outer side surface of the inner ring pad (22) at intervals, and the inner ring pad (22) being sleeved and fixed on the anchor rod (1); A screw-in installation assembly (3), the screw-in installation assembly (3) comprising a positioning foot plate (31), a conical funnel (32), a quick anchor rod clamp (33) and four supporting rods (34), a circular hole (311) is opened at the center of the positioning foot plate (31), the circular hole (311) is aligned with the anchor rod hole, and the positioning foot plate (31) is fixedly connected to the tunnel wall; wherein the top surface of the positioning foot plate (31) is fixedly connected with four first ball joint bearings evenly distributed around the center of the positioning foot plate (31) (312), the front end of the conical funnel (32) passes through the circular hole (311) and is installed on the anchor hole, one end of the four supporting rods (34) is respectively hinged to the four first ball joint supports (312), and the other ends of the four supporting rods (34) are respectively hinged to the quick anchor clamp (33), and a propulsion channel (331) is provided in the middle of the quick anchor clamp (33), and the anchor (1) passes through the propulsion channel (331) and the conical funnel (32) and is inserted into the anchor hole.

2. The central damping and screw-in installation device according to claim 1, characterized in that: The inner side surface of the inner ring gasket (22) is provided with at least two first grooves (221) which are provided along the circumference direction of the inner ring gasket (22), and the inner side surface is the side in contact with the anchor rod (1).

3. The central damping and screw-in installation device according to claim 2, characterized in that: The quick anchor clamp (33) comprises two clamping jaws (332) connected by a hinge (333), and the two clamping jaws (332) are both semicircular structures, so that the relative arrangement of the semicircular structures of the two clamping jaws (332) forms the propulsion channel (331).

4. The central damping and screw-in installation device according to claim 3, characterized in that: The inner side surfaces of the two clamping jaws (332) are each provided with a convex tooth (334), and the outer side surfaces of the two clamping jaws (332) are each fixedly connected to two evenly distributed second ball joint supports (335); wherein the distribution angles of the four second ball joint supports (335) are consistent with the distribution angles of the four first ball joint supports (312).

5. The central damping and screw-in installation device according to claim 4, characterized in that: The support rod (34) is arc-shaped, and ball heads are provided at both ends of the support rod (34). The two ball heads are respectively hinged to the first ball joint support (312) and the second ball joint support (335); wherein the two ball heads are oriented in the same direction.

6. The central damping and screw-in installation device according to any one of claims 1 to 5, characterized in that: The diameter of the front end of the conical funnel (32) is not greater than the diameter of the anchor hole and not less than the diameter of the anchor (1); the diameter of the rear end of the conical funnel (32) is not less than the maximum diameter of the plurality of support bodies (21) and the inner ring gasket (22).

7. The central damping and screw-in installation device according to claim 6, characterized in that: The positioning foot plate (31) is provided with a plurality of bolt holes (313) and is fastened to the tunnel wall surface by bolts.

8. The central damping and screw-in installation device according to claim 7, characterized in that: The diameter of the circular hole (311) is greater than the diameter of the anchor hole.

9. The central damping and screw-in installation device according to claim 8, characterized in that: A second groove is formed on the outer side of the anchor rod (1), and the inner ring gasket (22) is bonded to the second groove.

10. The central damping and screw-in installation device according to claim 9, characterized in that: The width of the second groove is greater than the width of the inner ring gasket (22), and the opening depth of the second groove is between 1 / 2 and 3 / 2 of the thickness of the inner ring gasket (22).

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