A method for in-situ demolition of a spiral-collapsed chimney using explosive blasting.

Abstract

This invention discloses a method for in-situ demolition of a chimney using a spiral collapse mechanism, comprising the following steps: S1, determining the collapse range of the chimney and the area for blasting cuts on the chimney wall; S2, determining the parameters of the blasting cuts, wherein the opening directions of multiple blasting cuts are spirally distributed in space; S3, drilling holes in the blasting cuts and loading explosives, with detonators inside the holes detonating simultaneously; S4, blasting the chimney. This invention enables the setting of multiple blasting cuts to achieve a spiral collapse of the chimney body, resulting in a smaller blasting pile area, more uniform distribution, more reliable collapse, more flexible control of the collapse area, and weaker harmful blasting effects.

Description

Technical Field

[0001] This invention relates to the field of demolition technology for structures by blasting, and in particular to a method for demolishing a chimney by blasting in situ when it collapses in a spiral manner. Background Technology

[0002] Existing methods for demolishing chimneys by blasting mainly include directional blasting, folding blasting, and high-level cut-out blasting.

[0003] One method of demolition is directional blasting. This involves creating a regularly shaped notch at the base of the chimney through blasting, disrupting its stability. Under gravity, the chimney tilts towards the opening of the blasted notch. Once the notch closes, the chimney's center of gravity shifts outside the chimney wall, eventually causing it to collapse. The advantages of this method are that the entire project involves only one step, making construction convenient. The disadvantages are that it requires a relatively spacious demolition site. Generally, the length of the site should be no less than 1 to 1.2 times the height of the chimney, and the lateral width no less than 3 to 4 times the outer diameter of the chimney's base; otherwise, it can easily lead to danger.

[0004] The folding blasting demolition method is characterized by the need to set two blasting cuts on the chimney wall, so that the chimney is divided into two sections and folds and collapses in the designed direction. This method can reduce the collapse range of the blast pile and has more lenient requirements for the collapse site. However, the interaction between the multiple chimney wall sections during the tilting and folding process is more complex. Improper design of the blasting cut parameters can easily lead to an insignificant folding effect or even reverse collapse, which poses certain risks.

[0005] The high-level cut-out blasting demolition method is an extension of directional blasting. The main method is to raise the position of the blasting cut to avoid the influence of structures such as the ash accumulation platform at the bottom of the chimney on the stability of the collapse. However, this method often leaves a high chimney base after blasting demolition, which has an adverse effect on subsequent cleanup steps.

[0006] To avoid the problems associated with the aforementioned demolition methods using explosives, a method for demolishing chimneys in situ using spiral collapse is proposed to address these issues. Summary of the Invention

[0007] The purpose of this invention is to provide a method for in-situ demolition of chimneys by spiral collapse, in order to solve the problems existing in the prior art. This method can achieve the spiral collapse of the chimney body by setting multiple blasting cuts, with a smaller blasting pile area, more uniform distribution, more reliable collapse, more flexible control of the collapse area, and weaker harmful blasting effects.

[0008] To achieve the above objectives, the present invention provides the following solution: The present invention provides a method for in-situ demolition of a spirally collapsed chimney by explosive blasting, comprising the following steps:

[0009] S1. Determine the collapse area of ​​the chimney during demolition by blasting, and determine the layout area of ​​the blasting cuts on the chimney wall;

[0010] S2. Determine the parameters of the blasting cuts, and the opening directions of the multiple blasting cuts are spirally distributed in the space.

[0011] S3. Drill holes in the blasting cuts and load explosives, and detonators in the drilled holes detonate at the same time. Multiple blasting cuts are detonated sequentially from top to bottom with delayed detonation.

[0012] S4. Detonate the chimney.

[0013] Furthermore, the blasting cut has a trapezoidal structure.

[0014] Furthermore, in step S2, the parameters of the blasting cut include the number of blasting cuts, where the number of blasting cuts n = (1 / 26 ~ 1 / 24)h, and h is the height of the chimney.

[0015] Furthermore, in step S2, the parameters of the blasting cut include the angle α between the centerlines of two adjacent blasting cuts on the annulus, wherein the angle α is 30° to 40°.

[0016] Furthermore, in step S2, the parameters of the blasting cut include the vertical distance H between two adjacent blasting cuts, wherein H is 18m to 28m.

[0017] Furthermore, in step S3, the time interval between the detonation of two adjacent blasting cuts is 1s to 2.5s.

[0018] Furthermore, in step S, the surrounding environment of the chimney is determined, key protected building equipment is identified, the blasting cut area is mapped onto the chimney wall, and the blasting cut area extends through the height of the chimney.

[0019] Furthermore, in step S3, the parameters of the blast hole and the charge parameters within the blasting cut are determined, and blast holes are opened and the charge is filled into the blasting cut.

[0020] Furthermore, in step S3, the detonator lead is led out of the chimney, and the blasting cut is covered with protective covering, near-body flexible protection, and protective protection.

[0021] The present invention discloses the following technical effects:

[0022] 1. It can meet the needs of blasting demolition projects when site space is insufficient, and can greatly reduce the spatial impact range during the blasting demolition process;

[0023] 2. Multiple blasting cuts are evenly set vertically along the chimney wall to ensure that the chimney has the ability to form a stable collapse at all heights during the collapse process, effectively avoiding the impact of the solid structure at the bottom of the chimney on the reliable collapse of the chimney;

[0024] 3. Arranging blasting cuts evenly within the cut distribution area can ensure that the chimney collapses evenly within the allowable range, making related protective work more concentrated and reducing the amount of protective work.

[0025] 4. In terms of the crushing mechanism, the present invention makes full use of the potential energy of the chimney wall itself. During the collapse process, the compression and shearing between the sections of the chimney wall ensures the degree of crushing of the chimney wall while consuming the potential energy of the chimney wall, reducing the energy it carries when it hits the ground, which can reduce the collapse vibration and the amount of debris splashed on the ground. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram showing the distribution location of each blasting cut within the blasting cut distribution area;

[0028] Figure 2 This is a plan view of the area where the blasting cuts are distributed;

[0029] Figure 3 A schematic diagram showing the distribution of the allowable collapse range and the blasting cut areas;

[0030] Among them, 1. Chimney wall; 2. Blasting cut layout area; 3. Dividing line of blasting cut layout area; 4. Blasting cut. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1-3This invention provides a method for in-situ demolition of a spiral-collapsed chimney using blasting, comprising the following steps:

[0034] S1. Determine the collapse area of ​​the chimney by blasting demolition, and determine the blasting cut area 2 on the chimney wall 1.

[0035] Before demolishing the chimney by blasting, the chimney and the surrounding area are surveyed, and the allowable range for the chimney to collapse by blasting is delineated. After determining the allowable range, the blasting cut area 2 is determined on the chimney wall 1.

[0036] At the same time, the 3rd line of equal division of the blasting cut area was determined.

[0037] S2. Determine the parameters of the blasting cut 4, and the opening directions of multiple blasting cuts 4 are spirally distributed in the space.

[0038] The positions of each blasting cut 4 are determined in the blasting cut arrangement area 2. Multiple blasting cuts 4 are arranged sequentially from bottom to top along the chimney wall 1, and the multiple blasting cuts 4 are spirally distributed in the air space.

[0039] In this configuration, multiple blasting cuts 4 are set within the blasting cut arrangement area 2, which can divide the chimney wall 1 into multiple segments. On the one hand, this reduces the self-weight of each segment of the chimney wall 1, avoiding excessive shearing between chimney walls 1 during the collapse process, which would affect the reliable collapse of the chimney as a whole. On the other hand, the blasting cuts 4 are evenly distributed axially, which can avoid secondary support caused by factors such as the lower body and internal structure during the collapse of the chimney, making the collapse process safer and more reliable. The blasting cuts 4 are spirally distributed, which can control the precise collapse of the chimney wall 1 within the designated allowable collapse range, facilitating protective work.

[0040] S3. Drill holes and load explosives into blasting cuts 4. Detonators inside the drilled holes detonate simultaneously. Multiple blasting cuts 4 are detonated sequentially from top to bottom with delayed detonation. After the location of blasting cuts 4 is determined, blast holes are opened at the locations of blasting cuts 4 and explosives are loaded. Then, the blast holes are connected to form a network of detonation, ensuring that the blasting proceeds sequentially from top to bottom along the chimney wall 1 during detonation.

[0041] Specifically, the simultaneous detonation of detonators refers to the detonators in the same blasting cut 4 being set at the same time. In addition, industrial electronic digital detonators are used, and the detonators loaded in the project must be from the same manufacturer, batch, and specifications.

[0042] S4. Detonate the chimney.

[0043] The design was further optimized, and the blasting cut 4 was designed as a trapezoidal structure.

[0044] To further optimize the scheme, in step S2, the parameters of the blasting cut 4 include the number of blasting cuts 4, n = (1 / 26 ~ 1 / 24)h, where h is the height of the chimney.

[0045] The number of blasting cuts 4 is determined based on the height of the chimney.

[0046] To further optimize the scheme, in step S2, the parameters of the blasting cut 4 include the angle α between the center lines of two adjacent blasting cuts 4 on the ring, where the angle α is 30° to 40°.

[0047] The included angle α is key to controlling the range of chimney collapse, and when α is 35°, the interval can reduce the impact of excessive shearing between different sections of the chimney on the precise collapse of the chimney.

[0048] To further optimize the scheme, in step S2, the parameters of the blasting cut 4 include the vertical distance H between two adjacent blasting cuts 4, where H is 18m to 28m.

[0049] This height setting can effectively reduce the mass of each section of the chimney wall 1, reduce the vibration caused when the chimney wall 1 touches the ground, and control the explosion range after the chimney wall 1 falls to the ground by setting this parameter.

[0050] To further optimize the scheme, in step S3, the detonation time interval between two adjacent blasting cuts 4 is 1s to 2.5s.

[0051] The explosives packed in each blast hole are connected by detonators to form a common detonation network. The common detonation network is led out of the chimney. During the delay time of several blasting cuts 4, it should be ensured that the detonation time of each upper blasting cut 4 is earlier than that of the adjacent lower blasting cut 4.

[0052] The detonation time interval between each blasting cut 4 is 1.s to 2.5s. This range ensures that the upper chimney wall 1 forms a stable tilting trend, and that the collapse process is stable and controllable. This avoids the danger of the lower chimney wall 1 being pulled by excessive tilting of the upper chimney wall 1, or the lower blasting cut 4 detonating before the upper chimney wall 1 has formed a stable tilting trend, leading to a reverse collapse.

[0053] Specifically, a millisecond delay method is used to set the detonation sequence of the blasting cuts 4 at different heights.

[0054] To further optimize the plan, in step S1, the surrounding environment of the chimney is determined, key protected buildings and equipment are identified, and the blasting cut area 2 is mapped onto the chimney wall 1, and the blasting cut area 2 extends through the height of the chimney.

[0055] Understandably, the blasting cut area 2 is at the same height as the chimney.

[0056] To further optimize the scheme, in step S3, the borehole parameters and charge parameters within the blasting cut 4 are determined, and boreholes are drilled and charged within the blasting cut 4. Suitable borehole parameters and charge parameters are designed for each blasting cut 4, and boreholes are drilled and charged within the range of the blasting cut 4 according to the design.

[0057] To further optimize the plan, in step S3, the detonator lead is led out of the chimney, and a combination of covering protection, near-body flexible protection, and protective protection is installed at the blasting cut 4. This combination of covering protection, near-body flexible protection, and protective protection forms a comprehensive protective measure to ensure safety during the blasting process.

[0058] Specifically, such as Figure 3 As shown, multiple blasting cuts 4 are provided on the wall 1 of a chimney. The vertical distance between two adjacent blasting cuts 4 is H, and the distance between the center lines of two adjacent blasting cuts 4 is L.

[0059] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0060] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for in-situ demolition of a spiral-collapsed chimney using blasting, characterized in that: Includes the following steps: S1. Determine the collapse range of the chimney demolition by blasting, and determine the blasting cut arrangement area (2) on the chimney wall (1) of the chimney; S2. Determine the parameters of the blasting cut (4), and the opening directions of the plurality of blasting cuts (4) are spirally distributed in the space. S3. Drill holes in the blasting cuts (4) and load them with explosives. The detonators in the holes detonate at the same time. Multiple blasting cuts (4) are detonated sequentially from top to bottom with delayed detonation. S4. Demolish the chimney; The blasting cut (4) has a trapezoidal structure; In step S2, the parameters of the blasting cut (4) include the number of the blasting cuts (4), where the number of the blasting cuts (4) is n = (1 / 26 ~ 1 / 24)h, and h is the height of the chimney.

2. The method for in-situ demolition of a spiral-collapsed chimney by blasting according to claim 1, characterized in that: In step S2, the parameters of the blasting cut (4) include the angle α between the center lines of two adjacent blasting cuts (4) on the annulus, and the angle α is 30° to 40°.

3. The method for in-situ demolition of a spiral-collapsed chimney by blasting according to claim 1, characterized in that: In step S2, the parameters of the blasting cut (4) include the vertical distance H between two adjacent blasting cuts (4), where H is 18m to 28m.

4. The method for in-situ demolition of a spiral-collapsed chimney by blasting according to claim 1, characterized in that: In step S3, the time interval between the detonation of two adjacent blasting cuts (4) is 1s to 2.5s.

5. The method for in-situ demolition of a spiral-collapsed chimney by blasting according to claim 1, characterized in that: In step S1, the surrounding environment of the chimney is determined, key protected building equipment is identified, the blasting cut area (2) is mapped onto the chimney wall (1), and the blasting cut area (2) extends through the height of the chimney.

6. The method for in-situ demolition of a spiral-collapsed chimney by blasting according to claim 1, characterized in that: In step S3, the parameters of the borehole and the charge parameters in the blasting cut (4) are determined, and boreholes are opened and the charge is filled into the blasting cut (4).

7. The method for in-situ demolition of a spiral-collapsed chimney by blasting according to claim 1, characterized in that: In step S3, the detonator lead is led out of the chimney, and the blasting cut (4) is covered with protective, near-body flexible protection and protective protection.

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