CN206832583U - It is a kind of to be used for the experimental rig of anchor pole stretching and shearing in jointed rock mass - Google Patents

Abstract

The utility model discloses a test device for tensile and shearing of anchor rods in jointed rock mass, which comprises a main frame, a first test block and a second test block arranged side by side inside the main frame, the first test block The outside is wrapped with the first sub-frame used to reinforce the first test block, the outside of the second test block is wrapped with the second sub-frame used to reinforce the second test block, and anchors are pre-embedded in the first test block and the second test block The anchor rod is equipped with a load acquisition unit, the first test block is fixedly connected to the main frame, the jack for shearing the anchor rod is arranged under the second test block, and the jack for stretching the anchor rod is arranged on the second sub-frame. The pulling rod is located in the extending direction of the anchor rod, and the pulling rod is connected with an anchor rod puller. The utility model can simulate the stretching and shearing test of the bolt located in the jointed rock mass, can provide important test data for the reinforcement mechanism of the bolt in the jointed rock mass, and is convenient for popularization and application.

Description

A test device for tensile and shearing of bolts in jointed rock mass

technical field

The utility model belongs to the technical field of geotechnical engineering, in particular to a test device for tensile and shearing of bolts in jointed rock masses.

Background technique

Anchor bolts have a good reinforcement effect on jointed rock mass, and can effectively inhibit the expansion or sliding of the joint surface of the jointed rock mass. However, during the whole process of roadway excavation, external construction and mining, the jointed rock layer after anchoring will continue to deform, and the jointed rock mass will continue to deform. The joint fissures of the rock mass will still expand further. The joint cracks will generate additional stress on the anchor during the expansion process. At this time, the external load on the anchor will increase, the anchorage interface will be debonded and damaged, and the anchor will be broken. Due to the complexity of the jointed rock mass, the anchor The reinforcement mechanism in jointed rock still needs a lot of experimental research and theoretical discussion, so a test device for tensile and shearing of bolts in jointed rock should be provided.

Utility model content

The technical problem to be solved by the utility model is to provide a test device for tensile and shearing of anchor rods in jointed rock mass, which is simple in structure and reasonable in design, and can simulate the alignment of joints The tensile and shear tests of the bolt in the rock mass can provide important test data for the reinforcement mechanism of the bolt in the jointed rock mass, which is convenient for popularization and application.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a test device for tensile and shearing of anchor rods in jointed rock mass, which is characterized in that it includes a main frame, and a second A test block and a second test block, the outer side of the first test block is wrapped with a first sub-frame for reinforcing the first test block, and the outer side of the second test block is wrapped with a second sub-frame for reinforcing the second test block The sub-frame, the first test block and the second test block are pre-embedded with anchor rods, the anchor rods are provided with load acquisition units, the first test block is fixedly connected to the main frame, and the second test block is fixedly connected to the main frame. A jack for shearing the anchor rod is arranged under the test block, and a pull-out rod for stretching the anchor rod is arranged on the second sub-frame, and the pull-out rod is located in the extending direction of the anchor rod, and on the pull-out rod A bolt puller is connected.

The above-mentioned test device for tensile and shearing of anchor rods in jointed rock mass is characterized in that: the load collection unit is a foil strain gauge, and the number of the foil strain gauges is multiple.

The above-mentioned test device for bolt tension and shear in jointed rock mass is characterized in that: the first test block is fixedly connected to the main frame through high-strength bolts, and the second test block is placed on a flatbed .

The above-mentioned test device for bolt tension and shear in jointed rock mass is characterized in that: the main frame is a cuboid frame, the bottom of the main frame is provided with a bottom plate, and the top of the main frame is provided with a There are mounting plates for high-strength bolts.

The above-mentioned test device for bolt tension and shear in jointed rock mass is characterized in that: the first sub-frame and the second sub-frame are made of angle steel, and the first sub-frame is wrapped in the first test On the edge of the block, the second sub-frame is wrapped on the edge of the second test block.

The above-mentioned test device for tensile and shearing of anchor rods in jointed rock mass is characterized in that: the first sub-frame and the second sub-frame are provided with connecting plates, and the pulling rods are fixedly installed On the connecting plate located on the second subframe.

The above-mentioned test device for bolt tension and shear in jointed rock mass is characterized in that: the main frame is fixed on the ground by anchor bolts.

Compared with the prior art, the utility model has the following advantages:

1. In the utility model, the first test block and the second test block arranged side by side are connected into one body through anchor rods. The outer side of the first test block is wrapped with the first sub-frame, and the outer side of the second test block is wrapped with the second sub-frame. frame, and a load acquisition unit is set on the anchor rod; when performing a tensile test on the anchor rod, since the first test block is fixed on the main frame, the puller set on the second sub-frame is pulled Pull out the rod, thereby pulling the second test block installed in the second sub-frame, so that the second test block moves away from the first test block, thereby causing tensile deformation to the anchor rod; when performing a shear test on the anchor rod When the first test block is fixed on the main frame, the second test block is lifted by the jack, so that there is a misalignment between the second test block and the first test block, thereby causing shear deformation to the anchor rod; it is possible to simulate the The tensile and shear tests of the bolts in the jointed rock mass can provide important test data for the reinforcement mechanism of the bolt in the jointed rock mass, which is convenient for popularization and application.

2. The utility model pastes the foil strain gauge on the anchor rod, and the foil strain gauge is evenly arranged in the first test block and the second test block. When the anchor rod is subjected to tensile force or shear force, the foil strain gauge is used to The chip can collect the deformation of the anchor rod under stress, and the effect is good.

3. The utility model fixedly connects the first test block with the main frame through high-strength bolts, and places the second test block on the flatbed, which reduces the friction force generated in the process of pulling the second test block, so that when the anchor rod is stretched It saves time and labor, and can avoid the impact of friction on the tension provided by the bolt puller, thereby affecting the test accuracy.

4. The utility model has the advantages of simple structure, reasonable design, low production cost, long service life, and is convenient for popularization and application.

In summary, the utility model has a simple structure and a reasonable design, and can simulate the tensile and shearing tests on the anchor rods in the jointed rock mass, and can provide important test results for the reinforcement mechanism of the anchor rods in the jointed rock mass. data for promotion and application.

Below by accompanying drawing and embodiment, the utility model is described in further detail.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the connection relationship between the second sub-frame and the pull rod of the present invention.

Fig. 3 is a schematic diagram of the connection relationship between the anchor rod and the foil strain gauge of the present invention.

Explanation of reference signs:

1—main frame; 2—first test block; 3—second test block;

4—the first subframe; 5—the second subframe; 6—anchor;

7—pallet; 8—high-strength bolts; 9—jack;

10—flat car; 11—connecting plate; 12—drawing rod;

13—bolt puller; 14—foil strain gauge; 15—anchor bolt;

16—backing plate.

detailed description

As shown in Fig. 1, Fig. 2 and Fig. 3, the utility model comprises a main frame 1, a first test block 2 and a second test block 3 arranged side by side inside the main frame 1, and the outer side of the first test block 2 is wrapped There is a first sub-frame 4 for reinforcing the first test block 2, the outside of the second test block 3 is wrapped with a second sub-frame 5 for reinforcing the second test block 3, the first test block 2 and the second An anchor rod 6 is pre-embedded in the test block 3, and a load acquisition unit is arranged on the anchor rod 6, the first test block 2 is fixedly connected to the main frame 1, and the second test block 3 is provided with a Shear the jack 9 of the anchor rod 6, the second sub-frame 5 is provided with a pull-out rod 12 for stretching the anchor rod 6, the pull-out rod 12 is located in the extension direction of the anchor rod 6, and the pull-out rod 12 12 is connected with bolt puller 13.

In actual use, the first test block 2 and the second test block 3 arranged side by side are connected as a whole through the anchor rod 6, the outer side of the first test block 2 is wrapped with the first sub-frame 4, and the outer side of the second test block 3 is wrapped with There is a second sub-frame 5, and a load acquisition unit is set on the anchor rod 6; when the anchor rod 6 is subjected to a tensile test, since the first test block 2 is fixed on the main frame 1, the anchor rod puller 13 is used to Pull the pull-out rod 12 that is arranged on the second subframe 5, thereby pull the second test piece 3 that is installed in the second subframe 5, make the second test piece 3 move away from the direction of the first test piece 2, thereby Cause tensile deformation to anchor rod 6; When shear test is carried out to anchor rod 6, also, because first test block 2 is fixed on the main frame 1, therefore, utilize jack 9 to lift second test block 3, make Dislocation occurs between the second test block 3 and the first test block 2, thereby causing shear deformation to the anchor rod 6; it can simulate the tensile and shear test of the anchor rod 6 located in the jointed rock mass, which can be used for anchor The reinforcement mechanism of rod 6 in jointed rock mass provides important test data, which is convenient for popularization and application.

In actual use, one end of the anchor rod 6 is located inside the second test block 3 , and the other end of the anchor rod 6 protrudes from the first test block 2 and is fixedly installed on the tray 7 through a locking nut.

In this embodiment, the load collection unit is a foil strain gauge 14, and the number of the foil strain gauges 14 is eight. It should be noted that the four foil strain gauges 14 are located in the first test block 2, and the four foil strain gauges 14 The strain gauges 14 are located in the second test block 3 .

In this embodiment, the first test block 2 is fixedly connected to the main frame 1 through high-strength bolts 8, and the second test block 3 is placed on a flatbed truck 10. The flatbed truck 10 is set to reduce the process of pulling the second test block 2. The friction force generated in this method saves time and effort when pulling the anchor rod 6, and can avoid the friction force from affecting the pulling force provided by the anchor rod puller 13, thereby affecting the test accuracy. In actual use, in order to ensure the horizontality of the anchor rod 6 , it is necessary to place the first test block 2 on the backing plate 16 .

In this embodiment, the main frame 1 is a rectangular parallelepiped frame, the bottom of the main frame 1 is provided with a bottom plate, the flatbed cart 10 and the backing plate 16 are placed horizontally on the bottom plate, and the top of the main frame 1 is provided with a The mounting plate that high-strength bolt 8 installs.

In this embodiment, the first sub-frame 4 and the second sub-frame 5 are made of angle steel, the first sub-frame 4 is wrapped on the edge of the first test block 2, and the second sub-frame 5 is wrapped on the second test block. on the edge of block 3.

In this embodiment, the first sub-frame 4 and the second sub-frame 5 are provided with a connecting plate 11, and the pull rod 12 is fixedly mounted on the connecting plate 11 on the second sub-frame 5. In actual use , in order to ensure the stable fixation of the first subframe 4 and the second subframe 5, the fixed connection distance between the connecting plate 11 and each side beam of the cuboid frame should be increased as much as possible. It should be noted that: in order not to affect the The first test block 2 and the second test block 3 are adjacent to the deformation of the jointed rock mass, and the two opposite surfaces of the first test block 2 and the second test block 3 are not provided with connecting plates 11 .

In this embodiment, the main frame 1 is fixed on the ground by anchor bolts 13 .

In this embodiment, the bolt puller 13 is provided with a pressure gauge for detecting the pulling force. By setting the pressure gauge, the pressure of the bolt puller 13 during the pulling process can be recorded in real time.

In actual use, first, the first test block 2 and the second test block 3 are prefabricated, the anchor rod 6 is pre-embedded inside the first test block 2 and the second test block 3, and the foil strain gauge 14 is pasted on the anchor rod 6; Secondly, the first sub-frame 4 is set on the outside of the first test block 2, the second sub-frame 5 is set on the outside of the second test block 3, and the pull rod 12 is connected on the second sub-frame 5; then, on the main Place the backing plate 16 and the flatbed cart 10 on the bottom plate of the frame 1, respectively place the first test block 2 on the backing plate 16 through the opening on the side of the main frame 1, place the second test block 3 on the flatbed cart 10, and reuse High-strength bolts 8 fixedly connect the first test block 2 to the main frame 1, then install the jack 9 under the second test block 3, and connect the anchor rod puller 13 to the drawing rod 12; finally, use the anchor rod The puller 13 pulls the puller rod 12, thereby pulling the second test block 3, so that the second test block 3 moves away from the first test block 2, thereby causing tensile deformation to the anchor rod 6, and using the jack 9 to lift The second test block 3 causes a misalignment between the second test block 3 and the first test block 2, thereby causing shear deformation to the anchor rod 6. By recording the pressure of the anchor rod puller 13 displayed by the pressure gauge, by measuring The displacement of the second test block 3 in the main frame 1 is used to analyze and study the reinforcement mechanism of the bolt 6 in the jointed rock mass.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present utility model still belong to Within the scope of protection of the technical solution of the utility model.

Claims (7)

1. a kind of be used for the experimental rig of anchor pole stretching and shearing in jointed rock mass, it is characterised in that：Including main frame (1), simultaneously Row are laid in internal the first test block (2) and the second test block (3) of main frame (1), and use is enclosed with the outside of first test block (2) It is enclosed with the outside of the first subframe (4) for reinforcing the first test block (2), second test block (3) for reinforcing the second test block (3) run through in the second subframe (5), first test block (2) and the second test block (3) and be embedded with anchor pole (6), the anchor pole (6) load collecting unit is provided with, first test block (2) is fixedly connected on main frame (1), second test block (3) Lower section is provided with the jack (9) for shearing anchor pole (6), is provided with second subframe (5) for stretching anchor pole (6) Drawing bar (12), the drawing bar (12) is located at the bearing of trend of anchor pole (6), and anchor pole drawing is connected with the drawing bar (12) Pull out instrument (13).

2. according to a kind of experimental rig for stretching and shearing for anchor pole in jointed rock mass described in claim 1, its feature exists In：The load collecting unit is foil strain gauge (14), and the quantity of the foil strain gauge (14) is multiple.

3. according to a kind of experimental rig for stretching and shearing for anchor pole in jointed rock mass described in claim 1 or 2, its feature It is：First test block (2) is fixedly connected by high-strength bolt (8) with main frame (1), and second test block (3) is placed on On flat car (10).

4. according to a kind of experimental rig for stretching and shearing for anchor pole in jointed rock mass described in claim 3, its feature exists In：The main frame (1) is cuboid framework, and the bottom of the main frame (1) is provided with bottom plate, the top of the main frame (1) Portion is provided with the installing plate for high-strength bolt (8) installation.

5. according to a kind of experimental rig for stretching and shearing for anchor pole in jointed rock mass described in claim 1, its feature exists In：First subframe (4) and the second subframe (5) make by angle steel, and the first subframe (4) is wrapped in the first test block (2) on seamed edge, the second subframe (5) is wrapped on the seamed edge of the second test block (3).

6. according to a kind of experimental rig for stretching and shearing for anchor pole in jointed rock mass described in claim 1, its feature exists In：Connecting plate (11), the fixed peace of the drawing bar (12) are provided with first subframe (4) and the second subframe (5) On the connecting plate (11) on the second subframe (5).

7. according to a kind of experimental rig for stretching and shearing for anchor pole in jointed rock mass described in claim 1, its feature exists In：The main frame (1) is fixed on the ground by foundation bolt (15).