Auxiliary positioning support for highway engineering tunnel reinforcing steel bar anchor rod pull-out test

Abstract

The utility model relates to the technical field of engineering construction, in particular to an auxiliary positioning support for a highway engineering tunnel reinforcement anchor rod pull-out test, and aims to solve the problem that in the highway tunnel construction process at present, when reinforcement bond stress is detected through a reinforcement anchor rod in a tunnel lining, the reinforcement bond stress cannot be detected. Due to the lack of an auxiliary positioning device for driving and installing the tunnel anchor rod and the drawing base plate, the end of the anchor rod is generally deformed and bent, the drawing test base plate is difficult to install, and finally the drawing test data test is discontinuous. According to the support, the anchor rod penetrates through the positioning sleeve which is matched with the anchor rod in size, then the wedge-shaped base is stably arranged on the stratum, then the anchor rod stretching device is aligned with the positioning sleeve, and a stretching test is started, so that the influence of a common steel base plate in traditional stretching is avoided, and the bent anchor rod can be straightened; and meanwhile, equipment such as an anchor rod extension scale can be mounted according to requirements to detect the elongation in the stretching process, and the convenience of mounting the stretching device by an operator is improved to a great extent.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering construction, in particular to an auxiliary positioning support for the pull-out test of tunnel steel bars in highway engineering. Background Art

[0002] During the tunnel construction process, steel bars are driven into the tunnel lining, and in the later test and detection, the pull-out test is carried out on the lining surface to detect the grip force of the tunnel lining anchor bars, so as to judge the anchoring strength. However, during the driving process of the tunnel anchor bars, problems such as deformation and bending of the anchor bar ends will occur. Coupled with the fact that the tunnel contour surface is an arched curved surface, it is not conducive to installing the pull-out backing plate, which easily leads to problems such as the loosening of the jack and inaccurate data collection during the pull-out test. To solve the above problems, it is necessary to further optimize the auxiliary positioning tooling for the pull-out test of tunnel steel bars, so as to improve the convenience of installing the test device and the accuracy of detecting the pull-out test data. Summary of the Utility Model

[0003] The utility model provides an auxiliary positioning support for the pull-out test of tunnel steel bars in highway engineering to solve the problems existing in the above background.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] An auxiliary positioning support for the pull-out test of tunnel steel bars in highway engineering, comprising a wedge-shaped base, anchor supports symmetrically arranged on both sides of the wedge-shaped base, a semi-circular shaft movable support rotatably arranged between the anchor supports, a detachable positioning sleeve arranged on the top of the semi-circular shaft movable support, and an anchor elongation scale arranged on the top of the anchor support.

[0006] Further, both sides of the anchor support are fixedly connected with installation fixing backing plates through fastening bolts, arc-shaped sliding grooves are formed in the installation fixing backing plates, and connecting pins fixedly connected with the semi-circular shaft movable support are slidably arranged in the arc-shaped sliding grooves in a matching manner.

[0007] Further, an anchor elongation scale is vertically arranged on the top of the anchor support on one side of the semi-circular shaft movable support, and lubricating grease is filled between the semi-circular shaft movable support and the anchor support.

[0008] The utility model has the following beneficial effects:

[0009] An auxiliary positioning support for the tensile test of highway engineering tunnel steel bar bolts provided by the utility model mainly consists of a base, a support, a positioning sleeve, a backing plate, a notch, a scale, lubricating grease, etc. By matching the measured bolt size, a suitable detachable positioning sleeve is selected, and the bolt used for measurement is positioned through the positioning sleeve. Then, the wedge-shaped base is stably placed on the formation. After that, the bolt stretching device is aligned with the detachable positioning sleeve, and the stretching test is started. This effectively avoids the embarrassing situation of using ordinary steel plates as tensile backing plates in the traditional stretching process, and can straighten the bending of the installed bolts. At the same time, during the measurement process, equipment such as bolt elongation scales and micrometers can be installed according to requirements to detect the elongation rate during the stretching process, greatly improving the convenience of operators in installing the stretching device, and solving the problem that during the construction of highway tunnels, when detecting the steel bar grip force through the steel bar bolts in the tunnel lining, due to the lack of an auxiliary positioning device for installing the tunnel bolts and the tensile backing plate, the bolt end is usually deformed and bent, and it is difficult to install the tensile test backing plate, ultimately resulting in discontinuous tensile test data.

[0010] In the utility model, the wedge-shaped base can be designed with a hollowed-out structure, which can effectively reduce the weight of the device itself, reduce the self-weight of the equipment while meeting the bearing capacity requirements, and the wedge-shaped base is inclined, which can effectively provide an angle compensation for the movable support to reduce the limitation of the small rotation angle of the movable support.

[0011] In the utility model, the semi-circular shaft movable support is designed with a large aperture size, which can meet the passing of bolts of different sizes. At the same time, semi-circular notches are provided inside the two installation and fixing backing plates to ensure the stability of the support.

[0012] On the semi-circular shaft movable support in the utility model, a circular platform with a certain width is reserved, which can meet the splicing and installation of different specifications of stretching equipment to ensure full contact between the top surface of the jack and the backing plate and uniform force during the detection process.

[0013] The utility model has the characteristics of being able to assist in positioning, having high bearing strength, being applicable to bolts of multiple sizes, and being compatible with different specifications of stretching jacks. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a side schematic diagram of the overall structure of the utility model.

[0016] The meanings of the reference numerals are as follows:

[0017] 1. Anchor support; 2. Wedge-shaped base; 3. Semi-circular shaft movable support; 4. Removable positioning sleeve; 5. Installation and fixing backing plate; 6. Connecting pin; 7. Arc-shaped sliding notch; 8. Fastening bolt; 9. Anchor elongation scale; 10. Lubricating grease. Detailed implementation mode

[0018] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] As Figure 1-2 shown, an auxiliary positioning support for the tensile test of steel bar anchors in highway engineering tunnels includes a wedge-shaped base 2. On both sides of the wedge-shaped base 2, anchor supports 1 are symmetrically arranged. A semi-circular shaft movable support 3 is rotatably arranged between the anchor supports 1. A removable positioning sleeve 4 is arranged on the top of the semi-circular shaft movable support 3. An anchor elongation scale 9 is also arranged on the top of the anchor support 1.

[0020] On both sides of the anchor support 1, installation and fixing backing plates 5 are fixedly connected through fastening bolts 8. Arc-shaped sliding notches 7 are formed on the installation and fixing backing plates 5, and connecting pins 6 fixedly connected to the semi-circular shaft movable support 3 are slidably arranged in a matching manner in the arc-shaped sliding notches 7.

[0021] An anchor elongation scale 9 is vertically arranged on the top of the anchor support 1 on one side of the semi-circular shaft movable support 3. Lubricating grease 10 is also filled between the semi-circular shaft movable support 3 and the anchor support 1.

[0022] The bolt support 1 and the wedge-shaped base 2 are integrally formed, having a high bearing capacity, and the stiffness stability meets the requirements. In order to reduce the self-weight of the device and reduce the labor intensity; the bottom area of the wedge-shaped base 2 can be hollowed out. A semi-circular shaft movable support 3 is slidably connected to the bolt support 1, and lubricating grease 10 is added to the gap area to improve the rotational flexibility; the semi-circular shaft movable support 3 is threadedly connected to the detachable positioning sleeve 4, which is convenient for replacing the positioning sleeve according to different bolt sizes and pulling requirements in the later stage; The mounting and fixing pad 5 is connected to the bolt support 1 with 8 M5 hexagon socket head cap screws, which can play a fixing role and reduce the lateral slip of the semi-circular shaft movable support 3. An arc-shaped sliding notch 7 is provided in the middle area of the mounting and fixing pad 5. The arc-shaped sliding notch 7 can effectively limit the rotation angle of the semi-circular shaft movable support 3. For large-angle rotation requirements, the wedge-shaped base 2 can provide partial angle compensation, reducing the structural design requirements of the device itself; The connecting pin 6 is threadedly connected to the semi-circular shaft movable support 3. The connecting pin 6 passes through the arc-shaped sliding notch 7 in the middle of the mounting and fixing pad 5 to make contact, playing a role in installing and positioning the semi-circular shaft movable support 3, and also playing a role in limiting the movable bolt; A mounting chute for the bolt elongation scale 9 is reserved on the back of the bolt support 1. The bolt elongation scale 9 meeting the accuracy requirements can be installed according to the measurement needs. At the same time, a bracket for installing other measuring devices such as a micrometer can also be reserved during later use, broadening its application scenarios.

[0023] When the utility model is specifically applied, each component of the support is pre-installed well to ensure that the semi-circular shaft movable support 3 rotates flexibly. Then, before the start of the bolt pull-out tensile test, the detachable positioning sleeve 4 is selected according to the diameter of the bolt for the pull-out test, and a positioning sleeve suitable for the bolt diameter is selected and installed and fixed firmly. After that, the ground around the bolt is leveled, and the bottom surface of the wedge-shaped base 2 is closely contacted with the surrounding rock. The bolt is passed through the detachable positioning sleeve 4, and then the unloading valve of the tensiometer hand pump is opened counterclockwise to make the hydraulic oil in the jack return to the oil cylinder of the hand pump. The plug at the end of the oil cylinder is unscrewed to draw out the oil level gauge for inspection. If the oil quantity is insufficient, 20# mechanical oil or 20# hydraulic oil should be added until the oil level meets the requirements. Then, the jack is put on again, the end face of the jack is aligned with the detachable positioning sleeve 4, the piston extension end faces outward and the fixture is installed to make the equipment concentric with the bolt to avoid eccentric tension. Before connection, it should be checked whether there is dirt at the joint, and strict prevention should be taken to prevent dirt from entering the joint. Then, the jack and the hand pump are connected by the quick connectors at both ends of the high-pressure hose and the special clips. The unloading valve of the hand pump is tightened clockwise, and the pressure lever of the hand pump is shaken up and down for preloading. Observe the rotation of the semi-circular shaft movable support 3 of the adaptive bolt to judge whether there is eccentric force or looseness in the stress state of the bolt. If there is a requirement for measuring the bolt elongation rate data, the initial position is marked by using the bolt elongation scale 9, and the relative position between the initial reading and the bolt clamping end is fixed by using the fixture. The bolt pull-out test is carried out. When the reading reaches the designed required value, it can be stopped. The load of the jack is recorded. The elongation data of the bolt can be obtained by subtracting the initial reading from the reading after stretching by using the bolt elongation scale 9 and recorded in detail. Then, the unloading valve of the tensiometer hand pump is opened counterclockwise. After the jack is unloaded, the jack and the auxiliary positioning support can be removed. This installation test process effectively solves the problem that during the construction of highway tunnels, when detecting the steel bar bond strength through the steel bar bolts in the tunnel lining, due to the lack of an auxiliary positioning device for the installation of tunnel bolts and pull-out pads, the bolt end is usually deformed and bent and it is difficult to install the pull-out test pad, resulting in discontinuous pull-out test data. Therefore, this positioning support has good practicability.

Claims

1. An auxiliary positioning support for a steel bar anchor pull-out test in a highway engineering tunnel, characterized by: The invention comprises a wedge-shaped base (2), anchor rod supports (1) are symmetrically arranged on both sides of the wedge-shaped base (2), a semicircular shaft movable support (3) is rotatably arranged between the anchor rod supports (1), a detachable positioning sleeve (4) is arranged on the top of the semicircular shaft movable support (3), and an anchor rod elongation scale (9) is also arranged on the top of the anchor rod support (1).

2. The auxiliary positioning support for the pull-out test of steel bar anchor rods in a highway engineering tunnel according to claim 1 is characterized by: Both sides of the anchor support (1) are fixedly connected to mounting fixing plates (5) via fastening bolts (8), the mounting fixing plates (5) are provided with arc-shaped sliding grooves (7), and matching connecting pins (6) are provided in the arc-shaped sliding grooves (7) for sliding and fixing connection with the semicircular shaft movable support (3).

3. The auxiliary positioning support for the pull-out test of steel bar anchor rods in highway engineering tunnels according to claim 2 is characterized by: An anchor rod elongation scale (9) is vertically provided on the top of the anchor rod support (1) located on one side of the semicircular shaft movable support (3), and lubricating grease (10) is also filled between the semicircular shaft movable support (3) and the anchor rod support (1).

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