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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 of tall and large reinforced concrete cooling towers under complex environmental conditions.

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

Embodiment 1

[0029] Example 1: The reinforced concrete cooling tower in this example is a 6000m2 hyperbolic cooling tower with an overall cast-in-place reinforced concrete structure, the tower height is 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 wall is double Curved surface, the maximum wall thickness of the tower wall is 0.8m; the minimum wall thickness is 0.18m, the herringbone pillar is a cylinder with a diameter of 0.7m, and the height is 5.0m. m.

[0030] The blasting scheme is chosen to adopt the composite notch blasting method of high unloading groove, and the blasting notch is set at the bottom of the cylinder, and the overall directional collapse.

[0031] This example specifically includes the following steps: mechanically remove the water spraying platform inside the cooling tower, cut off the connection between the external pedestrian ladder and the ground, arrange blasting cuts at the...

Embodiment 2

[0051] Embodiment 2: as image 3 As shown, its implementation object is an overall 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. 140mm, the herringbone pillars are hexagonal prisms with a side length of 450mm, a total of 40 pairs, the elevation is 5.8m, the beam height of the upper ring of the herringbone pillars is 2m, and the thickness is 500mm.

[0052] This embodiment specifically includes the following steps: mechanically remove the water spraying platform inside the cooling tower, cut off the connection between the external pedestrian ladder and the ground, arrange blasting cuts at the bottom of the cooling tower; drill holes on the herringbone pillars; open directional windows on the simplified body; A high unloading groove is set up on the body, and part of the ring beam is loosened. In this examp...

Embodiment 3

[0072] Embodiment 3: as Figure 4 As shown, the height of the cooling tower to be implemented is 100m, the radius of the bottom is 43.80m; the wall thickness of the ring beam is 600mm, the height of the ring beam is 1.25m, and the minimum wall thickness of the top is 140mm; 5m, spacing 6.4m, a total of 44 pairs.

[0073] This example specifically includes the following steps: mechanically remove 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; Open the directional window; set up a high unloading groove on the cylinder, and loosen part of the ring beam. In this example, the loosening treatment position of the ring beam and the opening position of the high unloading groove are separated, and safety protection measures are implemented; the herringbone pillar test Detonation; charging, connection, non-electric two-way enhanced detonation...

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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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