Search

CN-122015597-A - Blasting method for construction diversion middle dike

CN122015597ACN 122015597 ACN122015597 ACN 122015597ACN-122015597-A

Abstract

The application discloses a method for blasting a dam in construction diversion, which belongs to the technical field of blasting construction and comprises the following steps of S1, measuring topography, S2, arranging blast holes, arranging two rows of slow-angle inclined holes at the bottom of a slope of a dam near a dry area, determining the depth of the slow-angle inclined holes according to the measured topography, arranging a vertical hole and a top inclined hole at the top of the dam according to the slope of the dam, controlling the hole bottom to be 1.8m to 2.2m away from a second blast hole at the bottom, S4, charging, S5, plugging the orifices of the slow-angle inclined holes, the vertical hole and the top inclined hole, S6, detonating, connecting explosive in each blast hole of the dam, detonating the blast hole at the top of the dam, and then starting the blast hole at the bottom of the dam. The application has the effects of facilitating the dismantling of the centering dyke, reducing engineering cost and ensuring the overall construction progress.

Inventors

  • LI LEIBIN
  • LI LINNA
  • Luo Fanwen
  • Lao Zhenghuan
  • ZHANG JIANJUN
  • XIAO TAO
  • ZHANG CHENG
  • XIONG KANG
  • LI ZIHUA
  • CHEN MANG
  • DONG YONGCHANG

Assignees

  • 中铁广州工程局集团有限公司
  • 中铁广州工程局集团港航工程有限公司
  • 广西平陆运河建设有限公司
  • 武汉科技大学

Dates

Publication Date
20260512
Application Date
20251230

Claims (10)

  1. 1. S1, measuring the topography and determining the detailed shape of a middle dam (1); S2, arranging blast holes, wherein two rows of slow angle inclined holes (4) are arranged at the bottom of a slope surface of a middle dam (1) close to a dry area (3), the depth of each slow angle inclined hole (4) is determined according to the measured topography, and the hole distance between the two rows of slow angle inclined holes (4) is 1.3m to 1.7 m; S3, drilling, wherein the through hole drilling equipment sequentially drills the slow angle inclined hole (4), the vertical hole (5) and the top inclined hole (6); S4, charging, wherein explosives are arranged in each slow-angle inclined hole (4), the vertical hole (5) and the top inclined hole (6); s5, plugging, namely plugging the orifices of each slow-angle inclined hole (4), the vertical hole (5) and the top inclined hole (6); S6, detonating, namely connecting explosive in each blast hole of the middle separation bank (1), detonating the blast hole at the top of the middle separation bank (1), and then starting the blast hole at the bottom of the middle separation bank (1).
  2. 2. The method for blasting the construction diversion dike according to claim 1, wherein in the step S2, the orifices of the first row of slow angle inclined holes (4) close to the bottom are positioned on the slope toe line of the middle dike (1), the vertical position of the hole bottom is positioned at the position 2m to 3m below the opposite slope toe line, the horizontal position of the hole bottom exceeds the opposite slope toe line by about 1.7m to 2.2m, and the vertical position of the hole bottom of the second row of slow angle inclined holes (4) close to the bottom is positioned at the height of the opposite slope toe line and the horizontal position of the hole bottom is 1.7m to 2.2m away from the opposite slope toe line.
  3. 3. A method of blasting a construction diversion dike according to claim 2, wherein in the step S2, a row of dry land inclined holes (7) are arranged at a position 1.4m to 1.6m away from the slope foot line of the middle dike (1) at the bottom of the dry area (3), and the hole bottom of the dry land inclined holes (7) is positioned at the bottom of the middle dike (1).
  4. 4. The method for blasting the construction diversion dike according to claim 1, wherein in the step S3, when the water leakage phenomenon occurs in the drilling process of the slow-angle inclined hole (4), the drill is removed, then the water-absorbing expansion piece is filled for stopping leakage, the drilling is continued after the water leakage in the slow-angle inclined hole (4) is stopped, and the PVC sleeve is arranged in the slow-angle inclined hole (4) after the drilling is completed.
  5. 5. The method for blasting the construction diversion dike according to claim 1, wherein in the step S4, when the explosives are arranged in the vertical hole (5) and the top inclined hole (6), the explosives are connected in advance through leads, the interval between two adjacent explosives is set, and then the explosives are sequentially hung in the vertical hole (5) and the top inclined hole (6).
  6. 6. The method for blasting the construction diversion dike according to claim 1, wherein in the step S4, when the slow-angle inclined hole (4) is filled with explosive, the explosive is connected in advance through a lead wire, two adjacent explosive intervals are arranged, then the explosive is placed through a feeding rod (8), the feeding rod (8) comprises a rod body (81), a feeding piece (82) and a receiving piece (83), the section of the rod body (81) is arc-shaped, the feeding piece (82) is arranged close to one end of the rod body (81), the feeding piece (82) penetrates through and is matched with the inner wall of the rod body (81) in a sliding mode, the receiving piece (83) is used for driving the feeding piece (82) to be stored or released, and when the rod body (81) is used for placing the explosive, the lowest explosive is fixed to the feeding piece (82) through adhesion.
  7. 7. The method for blasting a construction diversion dike according to claim 6, wherein the receiving member (83) comprises a material ejection spring (831), a material receiving rope (832) and a material receiving roller (833), the material ejection spring (831) is arranged between the rod body (81) and the feeding member (82) and applies a released elastic force to the feeding member (82), the material receiving roller (833) rotates and rotates on the rod body (81) and is located at the free end of the rod body (81) far away from the feeding member (82), and one end of the material receiving rope (832) is connected to the feeding member (82) while the other end is connected to the material receiving roller (833).
  8. 8. The method for blasting the construction diversion dike according to claim 7, wherein the rod body (81) is provided with a limiting assembly, the limiting assembly comprises a limiting ratchet wheel (11) and a limiting pawl (12), the limiting ratchet wheel (11) is coaxially and fixedly arranged on the receiving roller (833), and the limiting pawl (12) is rotatably arranged on the rod body (81) and meshed with the limiting ratchet wheel (11).
  9. 9. The method for blasting the construction diversion levee of claim 8, wherein the limiting assembly further comprises a limiting spring (13), one end of the limiting spring (13) is connected to the rod body (81), the other end of the limiting spring is connected to the limiting pawl (12), the limiting spring (13) applies elastic force to the limiting pawl (12) to move towards the direction close to the limiting ratchet wheel (11), and one end of the receiving roller (833) is arranged outside the rod body (81) in a penetrating mode and fixedly connected with the hand wheel (10).
  10. 10. The method for blasting a construction diversion dike according to claim 6, wherein the rod body (81) comprises a movable part (811) and a fixed part (812), the movable part (811) is arranged in a penetrating and sliding manner on the fixed part (812), the movable part (811) is in threaded engagement with the fixed part (812) and is fixed with the fixed part (812) through a bolt which abuts against the movable part (811), the feeding piece (82) is arranged at a free end of the movable part (811) far away from the fixed part (812), and the receiving piece (83) is arranged at a free end of the fixed part (812) far away from the movable part (811).

Description

Blasting method for construction diversion middle dike Technical Field The invention relates to the field of blasting construction, in particular to a construction diversion middle dike blasting method. Background In the infrastructure construction such as hydraulic engineering, channel renovation, in order to satisfy the flood, navigation or land utilization demand, the modification of original river course, water system is often needed, such as interception, straightening, widening or deepening. Such projects typically involve earth and rock excavation of an underwater or water-facing area. In order to ensure the smoothness of the original water system during construction and to take account of construction cost, environmental protection and land utilization efficiency, a construction scheme of framing and diversion is commonly adopted in the industry. The key of the scheme is that the river channel is divided into three times, and dry construction conditions are created by constructing a middle dam as a water retaining structure. Referring to fig. 1, in the framing diversion construction, a middle dam is used as a temporary water blocking structure, the temporary water blocking structure is used for blocking water after the first-period engineering is completed, a diversion water passing area is formed after the second-period engineering is completed, a dry area is formed, the diversion water passing area and the dry excavation area are respectively located on two sides of the middle dam, and the middle dam is required to be removed during the third-period construction. At present, a blasting method is generally adopted for removing the middle separation dike. The conventional blasting process is to drill vertical blast holes in the top of the levee for blasting. However, in practical application, due to the influence of blasting energy distribution and geological conditions, residues which cannot be completely broken and removed, namely so-called heel (shallow points), are easily formed at the toe part of the middle dam after blasting, and the residues are required to be subjected to shallow repair blasting by using a reef explosion ship in the subsequent process, so that not only is the engineering cost increased, but also the overall construction progress is slowed down, and improvement is required. Disclosure of Invention In order to facilitate the dismantling of the middle dam, reduce engineering cost and ensure the overall construction progress, the application provides a dam blasting method in construction diversion. The application provides a construction diversion dyke blasting method which adopts the following technical scheme: A method for blasting a middle dam in construction diversion includes the following specific steps of S1, measuring topography, determining the detailed shape of the middle dam, S2, arranging blast holes, arranging two rows of slow-angle inclined holes in the slope bottom of the middle dam, which is close to a dry area, determining the depth of the slow-angle inclined holes according to the measured topography, enabling the hole spacing between the two rows of slow-angle inclined holes to be 1.3m to 1.7m, arranging a vertical hole and a top inclined hole in the top of the middle dam according to the slope of the middle dam, controlling the hole bottom to be 1.8m to 2.2m away from a second blast hole in the bottom, S3, drilling the slow-angle inclined holes, the vertical hole and the top inclined hole in sequence by through hole drilling equipment, S4, charging, arranging explosive in each slow-angle inclined hole, the vertical hole and the top inclined hole, S5, blocking the hole opening of each slow-angle inclined hole, S6, detonating, connecting the explosive in each blast hole of the middle dam, and then detonating the blast hole in the middle dam. Through adopting above-mentioned technical scheme, through arranging two rows of slow angle inclined holes in the slope bottom that the median bank is close to dry area for the blasting energy can more concentrate, more fully act on the ground body in median bank bottom and the toe region, especially below the toe, thereby realizes the abundant breakage to this region, avoids traditional vertical big gun hole to be formed because of the blasting effect is not enough in toe department heel (shallow point). Simultaneously, through controlling the hole bottom of middle levee top big gun hole at 1.8m to 2.2m apart from bottom second row big gun hole to arrange the top big gun hole in the detonation order and explode earlier than bottom big gun hole, be convenient for realize blasting release and energy transfer from top to bottom, make the top blasting create the free face for bottom blasting, further improve the crushing effect of bottom ground, ensure that middle levee blasting demolishs thoroughly, need not follow-up shallow repair operation of sweeping under water, be favorable to reducing construction cost and realize the