Shear bolt structure and anchor structure, and method for repairing existing mortar layers using these structures

Abstract

The present invention provides a shear bolt structure and an anchor structure that stably anchor to existing mortar on a slope, preventing the new mortar from flowing down while ensuring close contact with the existing mortar. [Solution] The shear bolt structure 1 comprises a fixing bolt 2 that can be installed in an existing mortar layer M1, and a resistor 3 attached to the fixing bolt 2. The resistor 3 is composed of a first frame 10 which has a flat plate portion with an insertion hole through which the body portion 2b of the fixing bolt 2 can be inserted while holding the head portion 2a of the fixing bolt 2 on one side, a plurality of arms extending from the flat plate portion toward the outer diameter of the insertion hole, and legs extending vertically from the arms. The legs of the first frame 10 hold the flat plate portion above and horizontally from the sprayed surface S of the existing mortar layer M1. It is preferable that there are three or more arms, these arms extend outwards from the insertion hole at equal intervals, and the cross-section of the arms is curved in a U-shape.

Claims

1. A shear bolt structure comprising a fixing bolt that can be installed in an existing mortar layer and a resistance body that is attached to the fixing bolt, The resistor comprises a flat plate portion having a through hole through which the body of the fixing bolt can be inserted while holding the head of the fixing bolt on one side, a plurality of arms extending from the flat plate portion toward the outer diameter of the through hole, and legs extending perpendicularly from the arms, It is composed of a first structural body equipped with, The leg portion of the first frame holds the flat plate portion above and horizontally from the sprayed surface of the existing mortar layer. A shear bolt structure characterized by the following features.

2. The aforementioned arm section has three or more parts, The aforementioned arm portion extends outwards from the insertion hole at equal intervals, and The cross-section of the arm portion is curved in a U-shape. The shear bolt structure according to feature 1.

3. The aforementioned leg portion extends bifurcatedly from the aforementioned arm portion and is erected on the spraying surface. A shear bolt structure according to claim 1 or 2.

4. The flat plate portion or the leg portion is further provided with flow holes through which new mortar can be passed. A shear bolt structure according to claim 1 or 2.

5. The resistor further comprises a second body having the same configuration as the first body, The legs of the second frame are reversed so that they extend in the opposite direction to the direction in which the legs of the first frame extend, and the second frame is assembled to the first frame. The arm portion of the first frame and the arm portion of the second frame form a hollow through-cylinder, the base end of the hollow through-cylinder opens toward the insertion holes of the first and second frames, and the tip of the hollow through-cylinder opens toward the outside of the arm portion. A shear bolt structure according to claim 1 or 2.

6. An anchor structure comprising an anchor rod that can be installed in the ground and an existing mortar layer, and a resistor attached to the anchor rod, The resistor comprises a flat plate portion having a through hole through which the body of the anchor rod can be inserted while holding a nut screwed onto the upper end of the anchor rod on one side, a plurality of arms extending from the flat plate portion toward the outer diameter of the through hole, and legs extending vertically from the arms, It is composed of a first structural body equipped with, The leg portion of the first frame holds the flat plate portion above and horizontally from the sprayed surface of the existing mortar layer. An anchor structure characterized by the following features.

7. The anchor rod further comprises a drilling blade provided at the lower end of the anchor rod and a grout injection hole that penetrates the anchor rod from the upper end to the lower end. The anchor structure according to feature 6.

8. The aforementioned arm section has three or more parts, The aforementioned arm portion extends outwards from the insertion hole at equal intervals, and The cross-section of the arm portion is curved in a U-shape. The anchor structure according to claim 6 or 7.

9. The aforementioned leg portion extends bifurcatedly from the aforementioned arm portion and is erected on the spraying surface. The anchor structure according to claim 6 or 7.

10. The flat plate portion or the leg portion is further provided with flow holes through which new mortar can be passed. The anchor structure according to claim 6 or 7.

11. The resistor further comprises a second body having the same configuration as the first body, The legs of the second frame are reversed so that they extend in the opposite direction to the direction in which the legs of the first frame extend, and the second frame is assembled to the first frame. The arm portion of the first frame and the arm portion of the second frame form a hollow through-cylinder, the base end of the hollow through-cylinder opens toward the insertion holes of the first and second frames, and the tip of the hollow through-cylinder opens toward the outside of the arm portion. The anchor structure according to claim 6 or 7.

12. A method for repairing an existing mortar layer using the shear bolt structure described in claim 1, The process of drilling pilot holes in the existing mortar layer, The steps include: placing the resistor on the sprayed surface around the pilot hole; The steps include inserting the body of the fixing bolt through the insertion hole of the resistor and screwing it into the pilot hole to fix the shear bolt structure to the existing mortar layer, The process involves spraying new mortar onto the sprayed surface to embed the shear bolt structure, including, A method for repairing an existing mortar layer, characterized by the following:

13. A method for repairing an existing mortar layer using the anchor structure described in claim 6, The process of drilling anchor holes into the existing mortar layer and the ground, A step of inserting the majority of the anchor rod into the anchor hole and exposing the upper end of the anchor rod on the sprayed surface, The process involves further injecting grout material into the aforementioned anchor hole and allowing it to harden, The steps include: placing the resistor on the spraying surface with the upper end exposed from the spraying surface passed through the insertion hole of the resistor; The process of screwing the nut onto the upper end to integrate the resistor and the anchor rod, A step of spraying new mortar onto the sprayed surface to embed the anchor structure, including, A method for repairing an existing mortar layer, characterized by the following:

14. A method for repairing an existing mortar layer using the anchor structure described in claim 7, The process involves drilling into the existing mortar layer and the ground with the drilling blade, and drilling an anchor hole with most of the anchor rod inserted, The process involves further injecting grout material into the anchor hole through the grout material injection hole from the upper end of the anchor rod exposed on the sprayed surface and allowing it to harden. The steps include: placing the resistor on the spraying surface with the upper end exposed from the spraying surface passed through the insertion hole of the resistor; The process of screwing the nut onto the upper end to integrate the resistor and the anchor rod, A step of spraying new mortar onto the sprayed surface to embed the anchor structure, including, A method for repairing an existing mortar layer, characterized by the following:

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