CN-116677391-B - Metro connection channel static breaker excavation method

CN116677391BCN 116677391 BCN116677391 BCN 116677391BCN-116677391-B

Abstract

The invention discloses a method for excavating a static breaker of a subway communication channel, which comprises the following steps of 1, drilling a breaking hole and a hollow hole according to a design drawing, arranging a central hollow hole in the center of a face, arranging a circle of auxiliary hollow holes in the auxiliary hole position, arranging a circle of peripheral hollow holes in the peripheral hole position, arranging two circles of middle breaking holes at intervals between the central hollow hole and the auxiliary hollow hole, arranging a circle of auxiliary breaking holes between the auxiliary hollow hole and the peripheral hollow hole, arranging three columns of lower breaking holes at intervals below the middle breaking holes of an outer ring, 2, carrying out static breaking excavation, 3, carrying out secondary breaking and supporting, carrying out breaking according to a plan, creating a larger temporary hollow face, fully playing the breaking capacity of the static breaker, providing conditions for the effective release of the expansion force of the static breaker, not damaging a freezing wall, and accelerating the construction progress.

Inventors

HUANG BAOLONG
WEN HANHONG
SHEN PENGJU
XU SHURONG
KONG LINGHUI
WANG HENG
YANG ZHIGANG
SUN JIA
FU CAI
YANG NING
WEI KEDONG

Assignees

北京中煤矿山工程有限公司

Dates

Publication Date: 20260508
Application Date: 20230612

Claims (6)

1. A subway communication channel static breaker excavation method is characterized in that a subway communication channel formed by taking static breaking as a main part and manual secondary breaking as an auxiliary excavation freezing wall is formed, and comprises the following steps: The method comprises the steps of (1) drilling a crushing hole and a hollow hole according to a design drawing, arranging a central hollow hole (1) in the center of a face, arranging a circle of auxiliary hollow holes (2) at the auxiliary hole position, arranging a circle of peripheral hollow holes (3) at the peripheral hole position, arranging two circles of middle crushing holes (4) between the central hollow hole (1) and the auxiliary hollow holes (2) at intervals, arranging a circle of auxiliary crushing holes (5) between the auxiliary hollow holes (2) and the peripheral hollow holes (3), and arranging three rows of lower crushing holes (6) at intervals below the middle crushing holes (4) of an outer ring; Step 2, static crushing and excavation, wherein a middle crushing hole (4) and a lower crushing hole (6) are filled with powder firstly, the powder is filled after the crushing hole (5) is assisted, a static crushing agent is filled into the crushing hole, and the crushing hole is poked and compacted by a gun rod; step 3, secondary crushing and supporting, wherein after static crushing is finished, crushing conditions are checked, secondary crushing of the artificial machinery is carried out, primary supporting, waterproof and secondary supporting are carried out after trimming according to the contour line of the subway communication channel; In the step 2, after the static crushing agents in the middle crushing hole (4) and the lower crushing hole (6) are expanded, the frozen soil at the center and the lower part is crushed and drawn out to form a groove space, and then the auxiliary crushing hole (5) is filled with the powder, wherein the middle crushing hole (4) is filled with the powder in a circle by circle manner according to the direction from inside to outside, and the lower crushing hole (6) is filled with the powder in a sequence from top to bottom The charging time of each hole of the middle crushing hole (4) is controlled within 10min, the reaction time is controlled within 8-24 h, the charging time of each hole of the lower crushing hole (6) is controlled within 10min, the reaction time is controlled within 8-24 h, and the reaction time of the auxiliary crushing hole (5) is controlled within 8-24 h.
2. The method for excavating the static breaker of the subway communication channel according to claim 1, wherein the diameters of the central hollow hole (1), the auxiliary hollow hole (2) and the peripheral hollow holes (3) are all 80mm, the diameters of the middle breaking hole (4), the auxiliary breaking hole (5) and the lower breaking hole (6) are 40mm, all the hollow holes and the breaking holes are perpendicular to a face, and the depths of all the hollow holes and the breaking holes are 1.5m.
3. The method for excavating the static breaker of the subway communication channel according to claim 2, wherein the hole distance of the middle breaking hole (4) positioned in the inner ring is 425mm, the distance from the center empty hole (1) is 300mm, the hole distance of the middle breaking hole (4) positioned in the outer ring is 460mm, the ring distance of the middle breaking hole (4) positioned in the inner ring is 300mm, the hole distance of the auxiliary empty hole (2) is 400mm, the ring distance of the auxiliary empty hole (2) is 400mm, the hole distance of the auxiliary breaking hole (5) is 400mm, the ring distance of the auxiliary empty hole (2) is 400mm, and the hole distance of the peripheral empty hole (3) is 500mm, and the ring distance of the auxiliary breaking hole (5) is 400mm.
4. The method for excavating the static breaker of the subway communication channel according to claim 3, which is suitable for clay strata, wherein the compression strength of frozen soil of the frozen wall of the subway communication channel is more than 3.6 MPa.
5. The method for excavating the static breaker of the subway communication channel according to claim 1, wherein the static breaker is directly filled into the orifice from the bottom of the breaking hole by adopting a coiled static breaker, and the full-length charge is filled.
6. The method for excavating the static breaker of the subway interconnecting channel according to claim 1, wherein the broken holes are inspected before starting charging, no sundry blockage exists in the inspected holes, the explosive rolls are fully wetted, the weight ratio of water to explosive is 3:7, and the length of the gun rod is 2m.

Description

Metro connection channel static breaker excavation method Technical Field The invention relates to the technical field of subway communication channel construction. In particular to a method for excavating static breaker of a subway communication channel. Background With the continuous development of infrastructure projects such as subways in China, more and more subway communication channel projects, the freezing method is widely applied to the communication channel projects, and the difficulty of frozen soil excavation of the communication channel is high. In the existing engineering construction, the conventional pneumatic pick is generally adopted for excavation, a large amount of manpower and material resources are consumed, the speed is very low, and the efficient construction speed is not matched with the efficient construction speed required by the existing infrastructure construction project. The static breaker is prepared by using special clinker calcined at high temperature in a rotary kiln and a small amount of additive, and belongs to non-combustible, non-explosive and non-toxic articles. And a larger expansion pressure is generated in a certain time and is applied to the hole wall, when the tension force in the crushing body is far greater than the tensile strength of the crushing body, the crushing body starts to generate cracks, and the cracks are expanded under the continuous action of the expansion pressure until the crushing body cracks and breaks. The static breaker is a high-efficiency and safe breaking material, and is commonly used for safely dismantling concrete buildings, mining and cutting marble, granite and the like. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to provide the method for excavating the static breaker of the subway communication channel, which can simply, rapidly and economically excavate the frozen soil of the subway communication channel. In order to solve the technical problems, the invention provides the following technical scheme: A subway communication channel static breaker excavation method uses static breaking as a main and manual secondary breaking as an auxiliary to excavate a frozen wall to form a subway communication channel comprises the following steps: Step 1, drilling crushing holes and empty holes according to a design drawing, arranging a central empty hole in the center of a face, arranging a circle of auxiliary empty holes in the positions of auxiliary holes, arranging a circle of peripheral empty holes in the positions of peripheral holes, arranging two circles of middle crushing holes at intervals between the central empty hole and the auxiliary empty holes, arranging a circle of auxiliary crushing holes between the auxiliary empty holes and the peripheral empty holes, and arranging three rows of lower crushing holes at intervals at the lower parts of the middle crushing holes of an outer ring; step 2, static crushing and excavation, wherein a middle crushing hole and a lower crushing Kong Xian are used for charging, charging is carried out after the auxiliary crushing hole, static crushing agent is filled into the crushing hole, and tamping is carried out by using a gun rod for compaction; And 3, after static crushing, checking crushing conditions, carrying out secondary crushing on the artificial machinery, trimming according to the contour line of the subway communication channel, and carrying out primary support, waterproof and secondary support. In step 2, after the static breaker in the middle breaking hole and the lower breaking hole is expanded, the frozen soil in the center and the lower part is broken and scraped out to form a groove-shaped space, and then the auxiliary breaking hole is filled with the powder. Further, in the step 2, the middle crushing holes are filled in a circle-by-circle mode according to the direction from inside to outside, and the lower crushing holes are filled in a sequence from top to bottom. Further, the charging time of each hole of the middle crushing hole is controlled within 10min, the reaction time is controlled within 8-24 h, the charging time of each hole of the lower crushing hole is controlled within 10min, the reaction time is controlled within 8-24 h, and the reaction time of the auxiliary crushing hole is controlled within 8-24 h. Further, the diameters of the center empty hole, the auxiliary empty hole and the peripheral empty holes are 80mm, the diameters of the middle crushing hole, the auxiliary crushing hole and the lower crushing hole are 40mm, all the empty holes and the crushing holes are perpendicular to the face, and the depths of all the empty holes and the crushing holes are 1.5m. Further, the hole pitch of the middle crushing hole positioned in the inner ring is 425mm, the distance from the center empty hole is 300mm, the hole pitch of the middle crushing hole positioned in the outer ring is 460mm, the ring pitch of the middle crushing