CN205719364U - Suspension roof support bearing capacity device for quick testing - Google Patents

Abstract

The utility model discloses a fast test device for the bearing capacity of anchor rod support, which is characterized in that it is a quick test device for the bearing capacity of anchor rod support. Nuts, pallets and distance measuring instruments; the upper backing plate and the lower backing plate are in the shape of rectangular plates, one end surface of which is provided with a number of circular grooves arranged alternately, and the centers of the upper and lower backing plates are set There is a circular hole through which the anchor rod can pass; the springs are alternately arranged in the grooves of the upper backing plate and the lower backing plate, between the upper backing plate and the lower backing plate, and the three are bonded together by strong force. The binder is bonded together to form a composite plate, which is gradually flattened as the load on the spring group increases, and there is a monotonically increasing relationship between the load on the spring group and the displacement generated; according to the compression characteristics of the spring group material, Using the determined relationship between the load and deformation, the measurement of the load is transformed into the measurement of the displacement, and then the axial bearing capacity of the bolt is obtained. The utility model makes the measurement of the axial force of the anchor rod simple and feasible, and greatly reduces the measurement cost.

Description

Quick test device for bolt support bearing capacity

technical field

The utility model belongs to the technical field of geotechnical engineering, in particular to a device for testing the bearing capacity of anchor rods.

Background technique

Bolt support refers to a reinforcement and support method used in surface engineering such as slopes and deep foundation pits, as well as underground chambers such as tunnels and stopes. Use metal parts, wood parts, polymer parts or other materials to make pole columns, drive them into pre-drilled holes in the surface rock mass or the rock mass around the chamber, and use the special structure of the head, pole body and tail supporting plate, or Depending on the bonding effect, the surrounding rock and the stable rock mass are combined to produce suspension effects, composite beam effects, and reinforcement effects to achieve the purpose of support.

It has the advantages of low cost, good support effect, simple operation, flexible use, and less construction clearance. Since the bolt is buried inside the surrounding rock, it is a concealed structure, and it is difficult to evaluate the bearing capacity of its supporting function. In order to evaluate the support bearing capacity of the anchor, the axial force at the outer end of the anchor is generally taken as an important evaluation index, but the measurement of the axial force of the anchor is very difficult. At present, the methods of measuring the axial force of bolts at home and abroad mainly include: strain measurement method, pressure sensor measurement method and vibrating wire bolt dynamometer. These methods are susceptible to the influence of the external environment, the measurement results are unstable, and the High cost, complex detection methods and other disadvantages.

Contents of the invention

The purpose of this utility model is to aim at the above-mentioned problem existing in the prior art, provide a kind of fast testing device of bearing capacity of bolt support with simple structure, its technical solution is:

A rapid test device for the bearing capacity of anchor rods, characterized in that: it includes a spring, an upper backing plate, a lower backing plate, an anchor rod, a nut, a tray, and a distance measuring instrument; the upper backing plate and the lower backing plate, It is in the shape of a rectangular plate, with a number of circular grooves arranged alternately on one end surface, its function is to limit the installation position of the spring, and there is a circular hole in the center of the upper and lower backing plates, from which the anchor rod can be inserted. Hollow through; said tray, between the nut and the upper backing plate.

The springs are alternately arranged in the grooves of the upper backing plate and the lower backing plate, between the upper backing plate and the lower backing plate, and the three are bonded together by a strong adhesive to form a composite plate, and the center of the three Located on the same axis, the spring groups arranged alternately have a normal bearing capacity not less than the maximum axial force of the anchor cable. As the load on the spring group increases, it is gradually flattened, and the load on the spring group is the same as the resulting There is a monotonically increasing relationship between displacements.

The strength of the upper backing plate and the lower backing plate is far greater than that of the spring set.

The distance measuring instrument is used for measuring the distance between the upper and lower backing plates.

The application method of the present utility model is:

1. carry out compression test to described spring group, carry out compression test to it in normal direction by press, obtain its stress-strain relationship curve;

②Install the anchor rod, fix the inner anchor section of the anchor rod behind the surrounding rock matrix by conventional methods, make the anchor rod pass through the hole reserved in the composite plate, then install the pallet, tighten the nuts, and press the composite plate tightly ;

③After the anchor rod starts to be stressed, the axial force of the anchor rod reacts on the pallet through the nut, and the pallet transmits the force to the composite plate. Under the pressure, the spring group is compressed and deformed, and the upper backing plate and the lower backing plate are measured by the distance measuring instrument The vertical distance between them, and then according to the original distance between the two, the relative displacement caused by compression can be obtained, and then the normal strain can be obtained;

④ According to the stress-strain relationship curve measured in step ①, and the normal strain measured in step ③, the stress of the spring group can be obtained by conversion, and then the bearing capacity can be obtained, which is equal to the axial force of the anchor rod .

The basic principle of the utility model is: according to the compression characteristics of the spring group material, using the determined relationship between the load and the deformation, the measurement of the load is converted into the measurement of the displacement, and then the axial bearing capacity of the anchor rod is obtained.

The utility model has the advantages that: the device makes the measurement of the axial force of the bolt simple and easy, greatly reduces the measurement cost, and has great significance for the dynamic feedback support design on the engineering site.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described:

Fig. 1 is the three-dimensional structural diagram of this bolt support bearing capacity fast testing device;

Fig. 2 is a three-dimensional cross-sectional structure diagram of the rapid testing device for the bearing capacity of the bolt support.

In the figure, 1. spring; 2. upper backing plate; 3. lower backing plate; 4. anchor rod; 5. nut; 6. pallet; 7. surrounding rock matrix.

detailed description

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

As shown in Figures 1 to 2, the rapid test device for the bearing capacity of the bolt support includes a spring 1, an upper backing plate 2, a lower backing plate 3, an anchor rod 4, a nut 5, a tray 6 and a distance measuring instrument; The upper backing plate 2 and the lower backing plate 3 are in the shape of a rectangular plate, and one of the end faces has a number of circular grooves arranged alternately, and its function is to limit the installation position of the spring 1. In addition, the upper and lower backing plates are A circular hollow is provided in the center, and the anchor rod 4 can pass through the hollow; the pallet 6 is located between the nut 5 and the upper backing plate 6 .

The springs 1 are arranged alternately in the grooves of the upper backing plate 2 and the lower backing plate 3, between the upper backing plate 2 and the lower backing plate 3, and the three are bonded together by a strong adhesive to form a combined board , and the centers of the three are located on the same axis, the spring groups arranged alternately have a normal bearing capacity not less than the maximum axial force of the anchor rod 4, as the load on the spring group increases, it is gradually flattened, and the spring group There is a monotonically increasing relationship between the load and the resulting displacement.

The strength of the upper backing plate 2 and the lower backing plate 3 is far greater than that of the spring set.

The distance measuring instrument is used for measuring the distance between the upper and lower backing plates.

The application method of the present utility model is:

1. carry out compression test to described spring group, carry out compression test to it in normal direction by press, obtain its stress-strain relationship curve;

②Install the anchor rod 4, fix the inner anchor section of the anchor rod 4 behind the surrounding rock matrix 7 by conventional methods, make the anchor rod 4 pass through the hole reserved in the composite plate, then install the tray 6, and then tighten the nut 5, The combination board is pressed tightly;

③After the anchor rod 4 starts to be stressed, the axial force of the anchor rod 4 reacts on the pallet 6 through the nut 5, and the pallet 6 transmits the force to the composite plate. The vertical distance between the plate 2 and the lower backing plate 3, and then according to the original distance between the two, the relative displacement caused by the compression can be obtained, and then the normal strain can be obtained;

④ According to the stress-strain relationship curve measured in step ①, and the normal strain measured in step ③, the stress of the spring group can be obtained by conversion, and then the bearing capacity can be obtained. The bearing capacity is equal to the axis of the anchor rod 4. towards bearing capacity.

The specific embodiments described herein are only one of the more preferred specific implementations of the present utility model, and those skilled in the art to which the utility model belongs can make common changes or replacements to the described specific implementations of the utility model. Should be included in the protection scope of the present utility model.

Claims (4)

1. A fast test device for the bearing capacity of bolt support, characterized in that: it includes a spring, an upper backing plate, a lower backing plate, an anchor rod, a nut, a tray and a distance measuring instrument; The upper backing plate and the lower backing plate are in the shape of a rectangular plate, one of the end faces has a number of circular grooves arranged alternately, and the center of the upper and lower backing plates is provided with a circular cavity, and the anchor rod can be through the void; Said tray is located between the nut and the upper backing plate. 2. A fast test device for bolt support bearing capacity according to claim 1, characterized in that the springs are alternately arranged and placed in the grooves of the upper backing plate and the lower backing plate, between the upper backing plate and the lower backing plate Between the lower backing plates, the three are bonded together by a strong adhesive to form a composite plate, and the centers of the three are located on the same axis, and the spring groups arranged alternately have a normal load of not less than the maximum axial force of the anchor cable As the load on the spring group increases, it is gradually flattened, and there is a monotonically increasing relationship between the load on the spring group and the resulting displacement. 3. A rapid test device for bolt support bearing capacity according to claim 1, characterized in that the strength of the upper backing plate and the lower backing plate is much greater than that of the spring set. 4. A fast test device for bolt support bearing capacity according to claim 1, characterized in that the distance measuring instrument is used to measure the distance between the upper and lower backing plates.