Tensioning device of solid mortar anchor rod

Abstract

The utility model relates to the technical field of geotechnical engineering, in particular to a tensioning device of a solid mortar anchor rod, which comprises a clamping plate and a limiting piece, the limiting piece is fixed on the clamping plate, the clamping plate is used for being clamped at the front end of the solid mortar anchor rod, and two sides of the clamping plate extend backwards along the axial direction of the solid mortar anchor rod. The clamping plate comprises a head section, a straight section and an external expansion section, the straight section is fixed between the head section and the external expansion section, the external expansion section expands outwards relatively, the limiting piece is used for being clamped between two adjacent ribs of the solid mortar anchor rod, and the limiting piece is fixed to the straight section. After the anchor rod is driven into an anchor hole, the outer expansion section of the clamping plate abuts against the hole wall of the anchor hole, outward tension is applied to the hole wall, and therefore the tensioning effect is achieved, the anchor rod is prevented from being disengaged from the anchor hole, and the technical problem that in the prior art, a solid anchor rod is pulled out of a rock-soil body due to insufficient anchoring force is solved.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering technology, specifically to a tensioning device for solid mortar anchor rods. Background Technology

[0002] Rock bolt support, as an important reinforcement method in geotechnical engineering, has been increasingly widely used in the field due to its high safety, high efficiency, and low cost. Railway tunnel rock bolt support projects utilize solid rock bolts (also called mortar rock bolts), hollow rock bolts, and combined rock bolts. Solid rock bolts offer advantages such as low cost and simple construction; hollow rock bolts are commonly used for slope and foundation pit support; and combined rock bolts are used for tunnel arch support. By pressure grouting the rock bolt body, the effects of consolidating fractured rock mass, improving rock mass, isolating groundwater, and preventing rock bolt corrosion can be achieved, thus achieving excellent support results.

[0003] Currently, most solid anchor bolts are made of hot-rolled ribbed steel bars (threaded steel), which have poor deformation adaptability. When relative sliding occurs between the rock / soil and the anchor bolt, its anchoring capacity decreases, ultimately affecting project safety. Most anchor bolts generate pull-out resistance through the compressive force between the anchoring device and the rock / soil. A small number enhance the pull-out resistance through the friction between the bolt body and the rock / soil, and very few increase pull-out resistance by embedding part of the anchor bolt structure into the rock / soil. However, when the external tensile force reaches a certain level, the anchor bolt may be pulled out of the rock / soil due to insufficient anchoring force. Utility Model Content

[0004] The purpose of this utility model is to provide a tensioning device for solid mortar anchor rods, so as to solve the technical problem that solid anchor rods are pulled out of the soil and rock due to insufficient anchoring force in the prior art. The specific technical solution is as follows:

[0005] This utility model provides a tensioning device for a solid mortar anchor bolt, including a clamping plate and a limiting member. The limiting member is fixed to the clamping plate. The clamping plate is used to clamp the front end of the solid mortar anchor bolt, and both sides of the clamping plate extend backward along the axial direction of the solid mortar anchor bolt. The clamping plate includes a head section, a straight section, and an outwardly expanding section. The straight section is fixed between the head section and the outwardly expanding section. The outwardly expanding section expands outward relative to each other. The limiting member is used to engage between two adjacent ribs of the solid mortar anchor bolt and is fixed to the straight section.

[0006] A further improvement of the tensioning device for solid mortar anchor rods of this utility model is that the number of limiting members is multiple, and the multiple limiting members are spaced apart along the length direction of the straight section.

[0007] A further improvement of the tensioning device for solid mortar anchor rods of this utility model is that the limiting member is a clamping plate, and the clamping plate is provided with a groove for clamping the solid mortar anchor rod.

[0008] A further improvement of the tensioning device for the solid mortar anchor rod of this utility model is that the inclination angle of the clamping plate is the same as the inclination angle of the ribs of the solid mortar anchor rod.

[0009] A further improvement of the tensioning device for solid mortar anchor rods of this utility model is that the limiting member is a flange, and the flange is formed on the straight section.

[0010] A further improvement of the tensioning device for the solid mortar anchor rod of this utility model is that enclosing plates are formed on both sides of the straight section.

[0011] A further improvement of the tensioning device for the solid mortar anchor rod of this utility model is that a pointed tip is formed in the middle of the head section.

[0012] A further improvement of the tensioning device for the solid mortar anchor rod of this utility model is that the end of the outward expansion section is formed with an inward flange.

[0013] The application of the technical solution of this utility model has the following beneficial effects:

[0014] This utility model relates to a tensioning device for solid mortar anchor rods. By clamping a clamping plate at the front end of the solid mortar anchor rod, after the anchor rod is driven into the anchor hole, the outward-expanding section of the clamping plate abuts against the hole wall, applying outward tension to the hole wall, thus achieving a tensioning effect and preventing the anchor rod from coming out of the anchor hole. This solves the technical problem in existing technologies where solid anchor rods have insufficient anchoring force and are pulled out of the soil or rock. This utility model has a simple structure, is easy to operate, has low manufacturing cost, and is highly flexible.

[0015] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the tensioning device for solid mortar anchor bolt of this utility model installed at the front end of the anchor bolt, according to Embodiment 1.

[0018] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the tensioning device for solid mortar anchor bolts of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal anchor hole of the tensioning device for solid mortar anchor rods according to Embodiment 1 of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the tensioning device for solid mortar anchor rods of this utility model.

[0021] Among them, 1. Tensioning device; 101. Head section; 102. Straight section; 103. Outward expansion section; 104. Clamping plate; 105. Flanged edge; 106. Flange; 107. Enclosing plate; 2. Solid mortar anchor rod; 3. Anchor hole wall. Detailed Implementation

[0022] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] See Figures 1-4 As shown, a tensioning device for a solid mortar anchor rod includes a clamping plate and a limiting member. The limiting member is fixed to the clamping plate. The clamping plate is used to clamp the front end of the solid mortar anchor rod 2, and both sides of the clamping plate extend backward along the axial direction of the solid mortar anchor rod 2. The clamping plate includes a head section 101, a straight section 102, and an outwardly expanding section 103. The straight section 102 is fixed between the head section 101 and the outwardly expanding section 103. The outwardly expanding section 103 expands outward relative to each other. The limiting member is used to engage between two adjacent ribs of the solid mortar anchor rod 2, and the limiting member is fixed to the straight section 102.

[0024] Specifically, the tensioning device 1 is made of steel plate, and the clamping plate is preferably made of spring steel plate, so that the outward expansion section 103 always has outward expansion tension. The width of the outward expansion section 103 is greater than the diameter of the anchor hole, so that the outward expansion sections 103 on both sides of the tensioning device 1 are compressed after the anchor rod enters the hole, and an outward supporting force is applied to the anchor hole wall 3, thereby preventing the anchor rod from coming out of the anchor hole.

[0025] Preferably, there are multiple limiting members, which are spaced apart along the length of the straight section 102. Specifically, the distance between two adjacent limiting members should be greater than the width of the ribs of the solid mortar anchor rod 2, so as to facilitate locking between the two ribs.

[0026] Example 1, as Figure 2 As shown, the limiting component is a retaining plate 104, which has a groove for engaging the solid mortar anchor rod 2. Specifically, the retaining plate 104 can be fixed to the inner side of the straight section 102 by welding. The retaining plates 104 on both sides of the straight section 102 are correspondingly arranged. The center of the circle formed by the grooves of the corresponding two retaining plates 104 is approximately equal to the inner diameter of the anchor rod and smaller than the diameter of the edge of the anchor rod rib. Therefore, under normal conditions, the device will not come off from the front end of the anchor rod.

[0027] Preferably, the inclination angle of the clamping plate 104 is the same as the inclination angle of the ribs of the solid mortar anchor rod 2, so that the clamping plate can be fitted between the two ribs, thereby preventing the clamping plate from coming off the front end of the anchor rod after the tensioning device 1 is installed.

[0028] Example 2, as Figure 4 As shown, the limiting member is a flange 106, which is formed on the straight section 102. Specifically, the width of the flange 106 should be less than the distance between two adjacent ribs. This structure can be directly produced by mold forming, reducing the operation steps of welding the clamping plate 104, thereby further reducing costs when demand is high.

[0029] Preferably, the straight section 102 extends to form enclosure plates 107 on both sides, thereby reducing the deformation of the entire device during production and use.

[0030] Preferably, the head section 101 has a pointed tip in the middle, which facilitates the drilling of the front end of the solid mortar anchor rod 2 into the anchor hole.

[0031] Preferably, the end of the outward expansion section 103 is formed with an inward flange 105, thereby preventing the outward expansion section 103 from scratching the inner wall of the anchor hole when the solid mortar anchor rod 2 is drilled into the anchor hole, thus affecting the anchoring force after installation.

[0032] Before anchor bolt installation, the tensioning device 1 of this invention needs to be installed on the front end of the anchor bolt in the anchor bolt magazine. The device can be pried open from the tail of the expanding section 103 and then inserted onto the front end of the anchor bolt. Adjust it until the clamping plate 104 presses against the inner diameter of the anchor bolt; this completes the installation. Following the normal anchor bolt pushing procedure, after the anchor bolt is fully inserted into the hole, the two wings at the tail of the expanding section 103 of the tensioning device 1 begin to compress until they are the same size as the inner wall of the borehole. Figure 3 As shown. After the anchor bolt is fully driven in, the two wings at the tail of the outward-expanding section 103 abut against the rock surface, giving the anchor hole wall 3 an outward tension, thereby playing a tensioning role and preventing the anchor bolt from coming out of the rock hole.

[0033] This utility model relates to a tensioning device for solid mortar anchor rods. By clamping a clamping plate at the front end of the solid mortar anchor rod 2, after the anchor rod is driven into the anchor hole, the outwardly expanding section 103 of the clamping plate abuts against the anchor hole wall 3, applying outward tension to the anchor hole wall 3, thereby achieving a tensioning effect and preventing the anchor rod from coming out of the anchor hole. This solves the technical problem in existing technologies where solid anchor rods have insufficient anchoring force and are pulled out of the soil or rock. This utility model has a simple structure, is easy to operate, has low manufacturing cost, and is highly flexible.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tensioning device for a solid mortar anchor bolt, characterized in that, The device includes a clamping plate and a limiting member. The limiting member is fixed to the clamping plate. The clamping plate is used to clamp the front end of the solid mortar anchor rod (2), and the two sides of the clamping plate extend backward along the axial direction of the solid mortar anchor rod (2). The clamping plate includes a head section (101), a straight section (102), and an outward expansion section (103). The straight section (102) is fixed between the head section (101) and the outward expansion section (103). The outward expansion section (103) expands outward relative to each other. The limiting member is used to be engaged between two adjacent ribs of the solid mortar anchor rod (2). The limiting member is fixed to the straight section (102).

2. The tensioning device for solid mortar anchors according to claim 1, characterized in that, The number of the limiting members is multiple, and the multiple limiting members are spaced apart along the length direction of the straight section (102).

3. The tensioning device for solid mortar anchors according to claim 1, characterized in that, The limiting component is a clamping plate (104), which has a groove for clamping the solid mortar anchor rod (2).

4. The tensioning device for solid mortar anchors according to claim 3, characterized in that, The tilt angle of the card plate (104) is the same as the tilt angle of the ribs of the solid mortar anchor rod (2).

5. The tensioning device for solid mortar anchors according to claim 1, characterized in that, The limiting member is a flange (106), which is formed on the straight section (102).

6. The tensioning device for solid mortar anchors according to claim 5, characterized in that, Enclosing plates (107) extend from both sides of the straight section (102).

7. The tensioning device for solid mortar anchors according to claim 1, characterized in that, The head segment (101) has a pointed tip in the middle.

8. The tensioning device for solid mortar anchors according to claim 1, characterized in that, The end of the extended section (103) is formed with an inward flange (105).

Images