Anchor rod grouting hole sealing device

Abstract

An anchor rod grouting hole sealing device comprises an anchor rod, a grouting pipe and a slurry return pipe, the anchor rod, the grouting pipe and the slurry return pipe are arranged in an anchor rod hole in a linear mode and fixed through an upper binding wire and a lower binding wire, and a geotechnical cloth layer and a mortar layer are sequentially distributed on a pipe opening in the upper end of the anchor rod hole from bottom to top. The anchor rod grouting hole sealing device is low in investment, easy to operate, high in construction efficiency and capable of guaranteeing quality.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of anchor rod grouting construction, especially to an anchor rod grouting hole sealing device applied to the anchor rod grouting construction of tunnel, slope and other class III surrounding rock excavation support. BACKGROUND

[0002] When the "rod insertion before grouting" process is adopted, the anchor rod grouting pipe and the grout return pipe (also the exhaust pipe) have been installed on the rod body in advance, and the grouting can be started after the installation of the anchor rod is completed. The conventional installation form of the anchor rod, the grouting pipe and the grout return pipe is "triangle shape", and the anchor rod hole is plugged with mortar. The grouting is perfomed by grouting machine, and the grout perfusion volume is calculated according to the volume of the anchor rod hole and the volume of the anchor rod, which meets the grouting requirements. The anchor rod of the rod insertion before grouting is plugged before grouting, and the grouting is performed after the plugging mortar of the hole (about 10 cm long) reaches the grouting strength after about 8 hours. The grouting pressure is not less than 0.5 MPa, and the grouting machine is used to grout the grouting pipe when the grout return pipe (exhaust pipe) has thick grout overflow, and the grouting is stopped. The above construction method has the following problems: first, it is difficult to plug the hole, and after the installation of the anchor rod, the grouting pipe and the grout return pipe is completed, the three are easy to form a triangular gap, causing grout leakage; second, the waiting time for the grouting mortar to reach the grouting strength is too long (about 8 hours), which seriously affects the construction efficiency. CONTENT OF THE UTILITY MODEL

[0003] The utility model solves the technical problem of providing an anchor rod grouting hole sealing device, which effectively solves the problems of difficult hole plugging, grout leakage and long waiting time for the grouting mortar to reach the grouting strength. The method has low construction investment, simple operation, guaranteed quality and high construction efficiency.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] An anchor rod grouting hole sealing device, comprising an anchor rod, a grouting pipe and a grout return pipe, which are arranged in the anchor rod hole in "one" shape and fixed by the upper and lower lashing wires, and the upper end of the anchor rod hole is sequentially distributed with a geotextile layer and a mortar layer from bottom to top.

[0006] The depth of the geotextile layer in the anchor rod hole is between 4 cm and 6 cm.

[0007] The depth of the mortar layer in the anchor rod hole is between 9 cm and 11 cm.

[0008] The mortar layer is dry hard mortar, and the volume mixing ratio of cement to sand is 1:2.5.

[0009] The dry hard mortar contains a quick-setting agent, and the volume ratio of the dry hard mortar to the quick-setting agent is 1:0.06.

[0010] The anchor rod grouting hole sealing device has the following technical effects:

[0011] 1) When the "rod insertion and then grouting" process is adopted, the anchor rod, the grouting pipe and the back grouting pipe are installed in parallel "in-line shape", the triangular gap is eliminated, and the hole sealing difficulty is reduced.

[0012] 2) The dry hard mortar is prepared in advance, a little quick setting agent is sprayed on the mortar before hole sealing, the mortar is kneaded uniformly by hand, and then is inserted into the anchor rod hole (about 10 cm long) for hole sealing, so that the time for waiting for the grouting mortar to reach the grouting strength (about 1 h) is greatly shortened, and the mortar leakage problem is solved.

[0013] 3) Before the hole sealing mortar is inserted, the geotextile (about 5 cm long) is inserted first, the hole sealing mortar is solidified, and the whole anchor rod hole grouting is more full and dense. BRIEF DESCRIPTION OF DRAWINGS

[0014] The anchor rod grouting hole sealing device will be further described below in combination with the drawings and embodiments:

[0015] Fig. 1 It is a front view of the anchor rod grouting hole sealing device.

[0016] Fig. 2 It is a side view of the anchor rod grouting hole sealing device.

[0017] In the drawings: anchor rod 1, grouting pipe 2, back grouting pipe 3, hole sealing mortar 4, geotextile 5, lashing wire 6, anchor rod hole 7. DETAILED DESCRIPTION

[0018] As shown in the drawings, an anchor rod grouting hole sealing device comprises an anchor rod 1, a grouting pipe 2 and a back grouting pipe 3. Figs. 1-2 The anchor rod 1, the grouting pipe 2 and the back grouting pipe 3 are arranged in "in-line shape" in the anchor rod hole 7 and are fixed by the upper and lower lashing wires 6. The "in-line shape" arrangement can eliminate the triangular gap and reduce the hole sealing difficulty. The pipe opening of the anchor rod hole 7 is sequentially provided with a geotextile layer 5 and a mortar layer 4 from bottom to top. The mortar layer 4 is dry hard mortar, and the mixing ratio is preferably cement:sand (volume ratio) = 1:2.5. The dry hard mortar is added with a quick setting agent, and the volume ratio of the dry hard mortar to the quick setting agent is 1:0.06.

[0019] When grouting, the back grouting pipe 3 of the upward hole should be extended to the hole bottom, the grout is injected from the hole opening grouting pipe 2 until the back grouting pipe 3 returns the thick grout; for the downward hole, the grouting pipe 2 should be inserted to the hole bottom position, the grout is injected from the grouting pipe 2 until the hole opening back grouting pipe 3 returns the thick grout.

[0020] Working principle and process:

[0021] a、Grouting anchor rod production and installation

[0022] The installation of anchor rod 1, grouting pipe 2 and back grouting pipe 3 (bound by wire 6 between the three) is changed from "triangle shape" to "straight line shape", eliminating the triangular gap between the three.

[0023] b、Sealing orifice

[0024] The dry hard mortar 4 is prepared in advance, and the mixing ratio is preferably cement:sand (volume ratio) =1:2.5. A little quick-setting agent (volume ratio is preferably 1:0.06) is sprayed on the dry hard mortar 4 before sealing the hole, and the construction personnel knead it evenly with their hands (wearing protective articles), then put it into the anchor rod orifice 7 (about 10 cm long), and use steel bar to compact it.

[0025] c、Before putting in the sealing mortar, put in geotextile 5 (about 5 cm long) first, which speeds up the solidification of the sealing mortar and also makes the whole anchor rod hole grouting more full and dense.

Claims

1. A device for grouting and sealing a hole in a rock bolt, characterized in that It comprises an anchor rod (1), a grouting pipe (2) and a back-pulling pipe (3), the anchor rod (1), the grouting pipe (2) and the back-pulling pipe (3) are arranged in a "one" type in the anchor rod hole (7) and are fixed by the upper and lower lashing wires (6), the upper end pipe orifice of the anchor rod hole (7) is sequentially distributed with a geotextile layer (5) and a mortar layer (4) from bottom to top.

2. The anchor rod grouting hole sealing device according to claim 1, characterized in that: The depth of the geotextile layer (5) in the anchor rod hole (7) is between 4 cm and 6 cm.

3. A device according to claim 2, c h a r a c t e r i s e d in that: The depth of the mortar layer (4) in the anchor rod hole (7) is between 9 cm and 11 cm.

4. The anchor rod grouting hole sealing device according to claim 1, characterized in that: The mortar layer (4) is dry hard mortar, and the volume mixing ratio of cement to sand is 1:2.

5.

5. A device according to claim 4, c h a r a c t e r i s e d in that: The dry hard mortar is added with a quick-setting agent, and the volume ratio of the dry hard mortar to the quick-setting agent is 1:0.06.

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