High-unloading slot composite-incision demolition blasting method for reinforced concrete cooling tower

A technology for reinforced concrete and cooling towers, applied in blasting and other directions, can solve the problems of difficult blasting and demolition of tall reinforced concrete cooling towers, reduce the kinetic energy of slump and ground contact, control the vibration effect of ground contact, increase the degree of disintegration and disintegration effect of speed

Inactive Publication Date: 2014-10-08
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, these original methods are difficult to apply to the blasting demolition

Method used

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  • High-unloading slot composite-incision demolition blasting method for reinforced concrete cooling tower
  • High-unloading slot composite-incision demolition blasting method for reinforced concrete cooling tower
  • High-unloading slot composite-incision demolition blasting method for reinforced concrete cooling tower

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1: The reinforced concrete cooling tower of this example is a 6000m2 hyperbolic cooling tower with a monolithic cast-in-place reinforced concrete structure with a tower height of 120m; the maximum radius of the bottom is 44.586m; the radius of the throat is 26.59lm; the radius of the top is 28.471m, and the tower walls are double Curved shape, the maximum wall thickness of the tower wall is 0.8m; the minimum wall thickness is 0.18m, the herringbone pillar is a column with a diameter of 0.7m, the height is 5.0m, there are 48 pairs of herringbone pillars, the upper ring beam of the pillar is 1.29m high, and the thickness is 0.8 m.

[0030] The blasting plan chooses to use the high-unloading groove composite notch blasting method, and the blasting notch is set at the bottom of the cylinder, and the overall direction collapses.

[0031] This example specifically includes the following steps: mechanically dismantle the water spraying platform inside the cooling tower, cut...

Example Embodiment

[0051] Example 2: Such as image 3 As shown, its implementation object is an integrally cast-in-situ hyperbolic reinforced concrete cooling tower with a height of 90m. The maximum diameter of the bottom of the cooling tower is 73.546m; the diameter of the throat is 38.8m; the diameter of the top is 43.122m. The maximum wall thickness of the tower is 500mm and the minimum wall thickness. 140mm, the herringbone pillar is a hexagonal prism with a side length of 450mm, a total of 40 pairs, the elevation is 5.8m, the upper ring beam of the herringbone pillar is 2m high and the thickness is 500mm.

[0052] This embodiment specifically includes the following steps: mechanically dismantle the water spraying platform inside the cooling tower, cut off the connection between the external pedestrian ladder and the ground, and arrange blasting cuts at the bottom of the cooling tower; drill holes on the herringbone pillars; open directional windows on simplified Chinese characters; A high unloa...

Example Embodiment

[0072] Example 3: Such as Figure 4 As shown, the height of the cooling tower of the implementation object is 100m, the bottom radius is 43.80m; the wall thickness at the ring beam is 600mm, the ring beam height is 1.25m, and the top wall thickness is at least 140mm; the herringbone pillar is a square column with a size of 400mm×600mm, and the height is 5m, 6.4m apart, a total of 44 pairs.

[0073] This example specifically includes the following steps: mechanically dismantle the internal water spray platform of the cooling tower, cut off the connection between the external pedestrian ladder and the ground, and arrange blasting cuts at the bottom of the cooling tower; drill holes at the places where the herringbone pillars and ring beams need to be loosened and blasted; Open the directional window; the machine opens a high unloading groove on the cylinder, and loosens part of the ring beam. In this example, the ring beam loosening processing position is separated from the high unl...

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Abstract

The invention discloses a high-unloading slot composite-incision demolition blasting method for a reinforced concrete cooling tower, and relates to a demolition blasting method for the reinforced concrete cooling tower. The demolition blasting method comprises the following steps: pre-demolishing an internal sprinkling platform and an external ladder of the reinforced concrete cooling tower to be demolished by blasting; arranging a composite blasting incision including a rectangular herringbone pillar area, a trapezoidal ring beam area, an acute triangular directional window and a high unloading slot on the lower part of the tower body, wherein the high unloading slot and the directional window are mechanically arranged so as to ensure the construction precision; drilling at the herringbone pillar and a ring beam which is locally required to be loosened by blasting (a ring beam loosening area is constructed by a mechanical method and a blasting method), filling explosive, fencing, and strengthening blasting of a millisecond delay blasting network through non-electric bidirectional multi-point excitation. By the demolition blasting method, the falling direction can be accurately controlled, the number of boreholes and the amount of the explosive can be greatly reduced, the collapsing disintegration degree and the touchdown impact state of the tower body can be regulated and controlled, and the touchdown vibration can be effectively controlled.

Description

technical field [0001] The invention relates to a blasting demolition method of a reinforced concrete cooling tower, in particular to a blasting demolition method of a reinforced concrete cooling tower with a high unloading groove composite incision, Background technique [0002] At present, the demolition of reinforced concrete cooling towers in China adopts the directional collapse blasting demolition method. This method mainly uses the energy released by explosive explosion to break the tower body within a certain range at the bottom of the reinforced concrete cooling tower to form a cut. Trapezoidal, inverted trapezoidal, triangular and compound shapes, etc., drilling, charging, and blasting on the herringbone support, ring beam and cylinder in the blasting incision. After the blasting incision is formed, the reinforced concrete cooling tower will lose weight under the weight Under the action of steady moment, it will fall in the direction perpendicular to the neutral ax...

Claims

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Application Information

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IPC IPC(8): F42D3/02F42D1/00
Inventor 褚怀保梁为民张英才王新生陈峰宾杨小林余永强王金星吕小师
Owner HENAN POLYTECHNIC UNIV
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