CN-224227800-U - Soft rock tunnel upward grouting structure for enhancing stability of downward-penetrating existing gabion

Abstract

The utility model provides a soft rock tunnel upward grouting structure for enhancing stability of a downward-penetrating existing gabion, which relates to the upward reinforcement field of gabions and is used for being paved on a sliding body, wherein a first type grouting hole and a second type grouting hole are arranged in a gabion paving area, a plurality of first type grouting holes are obliquely arranged at the middle lower part of the gabion paving area and deep into the sliding body, a plurality of second type grouting holes are vertically arranged at the upper part of the gabion paving area and penetrate through the gabion, the sliding body and a potential sliding belt, a grouting unit is used for being inserted into the first type grouting holes and the second type grouting holes to perform grouting, the first type grouting holes and the second type grouting holes are used for filling different slurries, the contact area of the gabion and the sliding body and the potential sliding belt are consolidated, so that cooperative stress of the gabion and the soft rock stratum is realized, in addition, a duckbill valve is arranged on a sleeve valve can effectively prevent the slurries from flowing back into the sleeve valve tube, high-efficiency reinforcement of the gabion is realized, and the stability of the gabion can be effectively enhanced.

Inventors

• HOU XUEJUN
• GUO XIAOHANG
• LI PENG
• BAI HONGJIN
• CHENG XIAOJUAN
• LIU HUAN
• HE YANPING
• CHENG NING
• LIU KE
• Lei Lipeng
• HUANG JING
• WANG GUANCHAO
• ZHU ZHENGWEI
• CHI FENG
• YAO BIN
• WANG CHENGUANG
• GAO CHAO
• SHI YANWEN

Assignees

• 中交路桥建设有限公司
• 中国港湾工程有限责任公司

Dates

Publication Date

20260512

Application Date

20250522

Claims (8)

1. 1. A soft rock tunnel upward grouting structure for enhancing stability of a downward-penetrating existing gabion is characterized by comprising the following components: gabions (10) for laying on the slider (01); A first type grouting hole (20) and a second type grouting hole (30) are formed in a region paved by the gabion (10), a plurality of the first type grouting holes (20) are obliquely arranged at the middle lower part of the region paved by the gabion (10) in a horizontal plane, the first type grouting holes (20) penetrate through the gabion (10) and are deep into the slide body (01), a plurality of the second type grouting holes (30) are perpendicular to the horizontal plane and are formed at the upper part of the region paved by the gabion (10), and the second type grouting holes (30) penetrate through the gabion (10), the slide body (01) and the potential sliding belt (02); And the grouting unit is used for being inserted into the first type grouting holes (20) and the second type grouting holes (30) to perform grouting.
2. 2. The soft rock tunnel upward grouting structure for enhancing stability of a downward-penetrating existing gabion according to claim 1, wherein the first type grouting holes (20) extend downward n meters through the upper surface of the sliding body (01), n is a positive number smaller than the minimum thickness of the sliding body (01), and an included angle between the first type grouting holes (20) and a horizontal plane is 45 ° -60 °.
3. 3. The soft rock tunnel upward grouting structure for enhancing stability of a downward penetrating existing gabion according to claim 2, wherein a plurality of first type grouting holes (20) are arranged in a region paved by the gabion (10) from top to bottom in a stepped sector shape, the stepped sector shape comprises a plurality of concentric virtual arcs with gradually increased radius, each first type grouting hole (20) is arranged on the virtual arc, and the pitch of the first type grouting holes (20) positioned on the same virtual arc is 1.4-1.7 times of the slurry diffusion radius; The central angle corresponding to the virtual arc line is 60-90 degrees.
4. 4. A soft rock tunnel upward grouting structure for enhancing stability of a downward penetrating existing gabion according to claim 3, wherein the portion of the first type grouting holes (20) located under the gabion (10) is injected with modified epoxy chemical grout through a grouting unit, and the portion of the first type grouting holes (20) located in the gabion (10) is injected with quick setting grout doped with 5% of an expanding agent through the grouting unit.
5. 5. The soft rock tunnel upward grouting structure for enhancing stability of a downward-penetrating existing gabion according to claim 1, wherein grouting holes of the second type (30) are staggered in a quincuncial shape, the grouting holes of the second type (30) penetrate through the lower surface of the potential sliding belt (02) and extend downwards for m meters, and m is a positive number.
6. 6. The soft rock tunnel upward grouting structure for enhancing stability of a downward crossing existing gabion according to claim 5, wherein the quincuncial shape comprises a plurality of virtual straight lines from top to bottom, each of the second type grouting holes (30) is arranged on each virtual straight line at intervals, and in two adjacent virtual straight lines, the second type grouting hole (30) on one virtual straight line is located between the two second type grouting holes (30) on the other virtual straight line.
7. 7. The soft rock tunnel upward grouting structure for enhancing stability of a downward-penetrating existing gabion according to claim 6, wherein the second type grouting holes (30) are injected with ultra-fine cement slurry through grouting units.
8. 8. The soft rock tunnel upward grouting structure for enhancing stability of a downward penetrating existing gabion according to claim 1, wherein the grouting unit comprises a sleeve valve pipe, the sleeve valve pipe comprises an inner layer (41) and an outer layer (42) which are sleeved at intervals, grout outlet holes are formed in the radial direction of the inner layer (41) and the radial direction of the outer layer (42), duckbill valves (43) are arranged on the grout outlet holes in the inner layer (41), the other ends of the duckbill valves (43) penetrate out of the outer layer (42), an inner material layer (44) is formed between the inner layer (41) and the outer layer (42) by filling shell materials, and an outer material layer (45) is formed between the outer layer (42) and the gabion (10), a sliding body (01) or a potential sliding belt (02) and a sliding bed (03) by filling materials.

Description

Soft rock tunnel upward grouting structure for enhancing stability of downward-penetrating existing gabion Technical Field The utility model relates to the field of upward slope reinforcement, in particular to a soft rock tunnel upward slope grouting structure for enhancing stability of a downward penetrating existing gabion. Background In a soft rock stratum, a sliding body, a potential sliding belt and a sliding bed are sequentially arranged in the soft rock stratum from the outside to the inside, the sliding of the sliding body and the potential sliding belt below the sliding body easily causes poor self stability of a side slope, a gabion structure is generally used for the upward slope protection of the soft rock stratum, in order to achieve the void of a gabion contact surface and the upward slope sliding risk, the conventional grouting reinforcement is generally realized by adopting a mode of vertically drilling or uniformly distributing plum blossom holes, the vertical holes easily damage the gabion structure, slurry is difficult to directionally fill the void area at the bottom of the gabion, and the plum blossom holes can strengthen a deep rock body, but cannot realize cooperative stress of the gabion and the upward slope of the soft rock stratum because in order to achieve a better grouting reinforcement effect, the grouting structure needs to be optimized on the basis of the existing gabion. Disclosure of utility model The utility model provides a soft rock tunnel upward grouting structure for enhancing stability of an existing downward-penetrating gabion, and aims to solve the problem that the existing grouting reinforcement structure is difficult to consider the cooperative stress of the gabion and the upward slope. In order to achieve the above object, an embodiment of the present utility model provides a soft rock tunnel upward grouting structure for enhancing stability of a downward-penetrating existing gabion, comprising: the gabion is used for being paved on the sliding body; A first type grouting hole and a second type grouting hole are formed in a region paved by the gabion, a plurality of the first type grouting holes are arranged at the middle lower part of the region paved by the gabion in an inclined manner relative to the horizontal plane, the first type grouting holes penetrate through the gabion and deep into the sliding body, a plurality of the second type grouting holes are arranged at the upper part of the region paved by the gabion in a manner perpendicular to the horizontal plane, and the second type grouting holes penetrate through the gabion, the sliding body and the potential sliding belt; the grouting unit is used for being inserted into the first type grouting holes and the second type grouting holes to perform grouting. Preferably, the first type grouting holes extend downwards for n meters through the upper surface of the sliding body, n is a positive number smaller than the minimum thickness of the sliding body, and the included angle between the first type grouting holes and the horizontal plane is 45-60 degrees. Preferably, a plurality of first-type grouting holes are arranged in a gabion paved area from top to bottom in a stepped sector shape, the stepped sector shape comprises a plurality of concentric virtual arcs with gradually increased radiuses, each first-type grouting hole is arranged on the virtual arc, and the hole pitch of the first-type grouting holes positioned on the same virtual arc is 1.4-1.7 times of the slurry diffusion radius; The central angle corresponding to the virtual arc line is 60-90 degrees. Preferably, the part of the first type of grouting holes below the gabion is filled with the modified epoxy chemical grout through the grouting unit, and the part of the first type of grouting holes inside the gabion is filled with the quick setting cement grout doped with 5% of expanding agent through the grouting unit. Preferably, the second type grouting holes are staggered in a quincunx shape, and penetrate through the lower surface of the potential sliding belt and extend downwards for m meters, wherein m is a positive number. Preferably, the quincuncial shape includes a plurality of virtual straight lines from top to bottom, each of the second type grouting holes is arranged on each virtual straight line at intervals, and in two adjacent virtual straight lines, the second type grouting hole on one virtual straight line is located between two second type grouting holes on the other virtual straight line. Preferably, the second type grouting holes are filled with ultra-fine cement slurry through a grouting unit. Preferably, the grouting unit comprises a sleeve valve pipe, the sleeve valve pipe comprises an inner layer and an outer layer which are sleeved at intervals, slurry outlets are formed in the radial directions of the inner layer and the outer layer, a duckbill valve is arranged on the slurry outlets on the inner layer, the other end of the