A gas blasting demolition method using axial pre-bored hole reinforced concrete support

Abstract

The application relates to a gas blasting demolition method of a reinforced concrete pillar with an axial pre-buried hole, which comprises a reinforced concrete pillar, a height adjusting mechanism and a door opening arranged below a support cylinder wall, the top of the door opening is a horizontal plane, the reinforced concrete pillar is arranged in the inside of the door opening, the height adjusting mechanism is arranged below the reinforced concrete pillar, a pre-buried hole is arranged in the top of the reinforced concrete pillar along a longitudinal axis center line from the center, a gas blasting device is arranged in the inside of the pre-buried hole, one of carbon dioxide, liquid oxygen or liquid nitrogen is filled in the gas blasting device, and an initiating power source is electrically connected to the gas blasting device through a wire; the application completely replaces explosive blasting, omits complex safety approval work, greatly optimizes a blasting network, and reduces the influence of blasting on the surrounding environment.

Description

Technical Field

[0001] This invention relates to the field of gas blasting demolition technology, specifically a gas blasting demolition method for reinforced concrete columns with axially embedded holes. Background Technology

[0002] For the demolition of tall structures, manual and mechanical demolition are gradually being phased out due to their low efficiency and safety. Existing cases of tall structure replacement demolition involve replacing the supporting cylinder wall of the blasting cut with wooden piles, and then using gasoline to burn the wooden piles to disable them, thus achieving the purpose of demolishing the tall structure. However, the wooden pile replacement cuts are small and numerous, the burning time is long, the collapse direction is difficult to control, and the safety is low. At present, mechanical demolition of tall structures mainly uses long-arm demolition machines. Mechanical demolition has the advantages of eliminating the safety approval of blasting demolition, short construction period, and low cost. However, the collapse direction and flying rocks are difficult to control, endangering the safety of construction workers.

[0003] Drilling and blasting is widely used in the demolition of tall structures due to its safety and efficiency. However, because tall structures have a large height-to-diameter ratio, relatively small support area, and relatively thin support walls, drilling and blasting requires a large number of holes, resulting in high labor costs. At the same time, the thin support walls lead to low energy utilization of explosives and high explosive consumption. The number of detonators and plugs required for the blast holes is also high, and the blasting causes a rapid increase in dust, affecting the surrounding environment. In addition, the traditional directional window combined with drilling and blasting demolition method has a complex blasting network due to the large number of blast holes, which increases the risk of blasting network failure and misfire, thus leading to demolition failure. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes, which solves the problems of large dust volume, environmental pollution, and complex blasting networks associated with traditional explosive blasting.

[0005] A gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes includes the following steps:

[0006] Step 1: First, make several door openings below the support cylinder wall, with the door openings symmetrically distributed on both sides of the collapse center line on the inverted support cylinder wall;

[0007] Step 2: Insert the gas blasting device into the pre-embedded hole of the reinforced concrete column, and at the same time lead out the ignition lead wire and the liquid filling pipe from the groove.

[0008] Step 3: Replace the doorway in Step 1 with an axially pre-embedded reinforced concrete column support system;

[0009] Step 4: Fill the gas explosion device with liquid and connect the excitation pin wire to the detonation power supply through a wire to form a detonation network;

[0010] Step 5: Clear the site, then detonate the network.

[0011] As a further improvement to this method, the reinforced concrete support in step two includes a column body and a column head located at the upper end of the column body. The top of the column head is provided with a groove. The reinforced concrete support is prefabricated. The pre-embedded hole is located in the middle of the reinforced concrete support. The top of the pre-embedded hole extends through to the upper end face of the column head of the reinforced concrete support and communicates with the groove on the upper end face of the column head.

[0012] As a further improvement to this method, the cross-section of the reinforced concrete column is rectangular or circular, the column head of the reinforced concrete column is expanded outward, and the pre-embedded hole is axially pre-embedded.

[0013] As a further improvement to this method, the axial pre-embedded hole reinforced concrete column support system in step three includes a reinforced concrete column, a gas blasting device, and a support device.

[0014] As a further improvement to this method, the gas blasting device is installed inside the pre-embedded hole, and the gas blasting device includes a fracturing tube, an activation tube, a liquid filling tube, an activation lead wire, and stemming material.

[0015] The support device includes a jack, a protective cover, and a pad. The jack is installed on top of the pad, and a protective cover is installed on the top of the output end of the jack. The top of the protective cover is attached to the bottom of the reinforced concrete column.

[0016] As a further improvement to this method, the liquid filled into the gas explosion device in step four is one of carbon dioxide, liquid oxygen, or liquid nitrogen, and the carbon dioxide, liquid oxygen, or liquid nitrogen is filled into the interior of the fracturing tube through a filling tube.

[0017] As a further improvement to this method, in step three, the substitution method includes the following steps:

[0018] S1. When the number of doorways is odd, start from the first doorway located on the center line of the collapse; when the number of doorways is even, start from the first doorway on the side immediately adjacent to the center line of the collapse.

[0019] S2. Break the support cylinder wall to form a doorway;

[0020] S3. On a flat ground, place the pad, jack, and protective cover in sequence from bottom to top at the accurate position of the axial pre-embedded hole reinforced concrete column support system.

[0021] S4. Move the axially embedded reinforced concrete support column with the gas blasting device already installed onto the protective cover;

[0022] S5. Place the steel plate on the axially pre-embedded reinforced concrete support column;

[0023] S6. Raise the jacks until the axial pre-embedded hole reinforced concrete support system reaches the bearing requirements, then stop raising the jacks and complete the replacement of the first doorway.

[0024] S7. Use the same method to complete the construction of the remaining doorways, and proceed symmetrically towards both sides of the collapse centerline.

[0025] As a further improvement to this method, when the number of door openings is odd, the construction sequence of all door openings is to replace the reinforced concrete pillars starting from the first door opening located on the collapse center line, and then replace the reinforced concrete pillars at intervals of several door openings, until all door openings are replaced.

[0026] When the number of doorways is even, the construction sequence for all doorways is to start by replacing the reinforced concrete pillars from the first doorway on the side closest to the collapse centerline, and then replace the reinforced concrete pillars at intervals of several doorways until all doorways have been replaced.

[0027] As a further improvement to this method, when the number of door openings is odd, the construction sequence of all door openings is to replace the reinforced concrete pillars starting from the first door opening located on the collapse center line, and then replace the reinforced concrete pillars at intervals of individual door openings. After the replacement is completed, the remaining door openings are drilled and gas blasting devices are installed.

[0028] When the number of doorways is even, the construction sequence for all doorways is to replace the reinforced concrete pillars starting from the first doorway on the side closest to the collapse centerline, and then replace the reinforced concrete pillars at intervals of individual doorways. After the replacement is completed, drill holes and install gas blasting devices in the remaining doorways.

[0029] As a further improvement to this method, holes are drilled in the retaining support cylinder wall between the doorways. The drilling time is before the installation of the axially pre-embedded hole reinforced concrete column support system. After the drilling is completed, a gas blasting device is installed and detonated simultaneously with the axially pre-embedded hole reinforced concrete column.

[0030] As a further improvement to this method, the remaining support cylinder wall between the doorways is removed, and an axially pre-embedded hole reinforced concrete column support system is installed in the formed hole. After the gas blasting device is installed, all the axially pre-embedded hole reinforced concrete columns are detonated simultaneously.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] This invention completely replaces explosive blasting, eliminates the need for complex safety approval processes, significantly optimizes the blasting network, and reduces the impact of blasting on the surrounding environment. Although this method requires axially pre-embedded reinforced concrete supports and gas blasting fracturing tubes, it greatly reduces the amount of manual drilling and replaces the need for explosives and detonators, significantly optimizes the blasting network, ensures the effective implementation of blasting demolition, and makes blasting demolition more environmentally friendly. It has advantages for the blasting demolition of large-scale, tall structures. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0034] Figure 1 This is a schematic diagram of the lower part of the supporting cylindrical wall of the circular tall structure after the wall was broken and the column replaced in this invention;

[0035] Figure 2 This is a schematic diagram of the partitioning of the doorway on the supporting cylinder wall in this invention;

[0036] Figure 3 This is a development view of the doorway in this invention after the reinforced concrete support column has been replaced;

[0037] Figure 4 This is an unfolded view of a single doorway in this invention;

[0038] Figure 5 for Figure 4 In the cross-sectional view of AA;

[0039] Figure 6 for Figure 4 In the cross-sectional view of BB;

[0040] Figure 7 for Figure 4 Cross-sectional view of CC;

[0041] Figure 8 This is a schematic diagram of the reinforced concrete column and steel plate connected in this invention;

[0042] Figure 9 This is a schematic diagram of a protective cover in one example of the present invention;

[0043] Figure 10 This is a cross-sectional view of the reinforcement of a reinforced concrete column in one example of the present invention;

[0044] Figure 11 This is a schematic cross-sectional view of a reinforced concrete support after the gas blasting device is installed inside a pre-embedded hole, as described in one example of this invention.

[0045] Figure 12 A schematic diagram of drilling and gas blasting device inside a doorway without a replaced reinforced concrete support column;

[0046] Figure 13 This is a schematic diagram of the detonation network in one example of the present invention.

[0047] In the diagram: 1. Support cylinder wall; 2. Doorway; 3. Collapse centerline; 4. Ground; 5. Steel plate; 6. Reinforced concrete support column; 601. Column head; 602. Embedded hole; 603. Groove; 604. Column body; 7. Protective cover; 8. Jack; 9. Pad plate; 10. Fracturing tube; 11. Activation tube; 12. Fluid filling tube; 13. Activation lead wire; 14. Stem filler; 15. Wire; 16. Detonation power supply. Detailed Implementation

[0048] The following illustrations disclose several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details are not intended to limit the invention. That is, in some embodiments of the invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the illustrations in a simple schematic manner.

[0049] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0050] In the description of this technology, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0051] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0052] like Figure 1The diagram shown is a schematic of the lower part of the cylindrical wall of a tall circular structure after the wall was broken and the columns were replaced. It includes the supporting cylindrical wall 1, doorway 2, collapse center line 3, ground 4, steel plate 5, reinforced concrete column 6, protective cover 7, jack 8, and pad 9.

[0053] like Figure 2 The diagram shown is a partition diagram of the doorway 2 on the supporting cylindrical wall 1, including the supporting cylindrical wall 1, the doorway 2, and the collapse center line 3. The width of a single doorway 2 is determined by a combination of the structural characteristics of the tall structure and the thickness of the supporting cylindrical wall 1.

[0054] like Figure 3 The diagram shown is an unfolded view of the doorway 2 after the replacement of the reinforced concrete support column 6, including the doorway 2, the collapse center line 3, the steel plate 5, the reinforced concrete support column 6, the protective cover 7, the jack 8, and the pad 9.

[0055] like Figure 4 The diagram shown is an unfolded view of a single doorway 2, including the supporting cylindrical wall 1, doorway 2, ground 4, steel plate 5, reinforced concrete column 6, column head 601, pre-embedded hole 602, groove 603, column body 604, protective cover 7, jack 8, and pad 9; it shows the relative positional relationship between the reinforced concrete column 6 and doorway 2.

[0056] like Figure 5 As shown, is Figure 3 The sectional view of section AA includes a supporting cylinder wall 1, a steel plate 5, a reinforced concrete column 6, a column head 601, a pre-embedded hole 602, and a groove 603. The width of the steel plate 5 is equal to the wall thickness of the supporting cylinder wall 1, and the width of the reinforced concrete column 6 is slightly less than the wall thickness of the supporting cylinder wall 1. The column section of the reinforced concrete column 6 is square, and the width of the outward expansion of the column head 601 is generally 200-300mm.

[0057] like Figure 6 As shown, is Figure 3 The sectional view of section BB includes the supporting cylinder wall 1, ground 4, steel plate 5, reinforced concrete column 6, column head 601, pre-embedded hole 602, groove 603, column body 604, protective cover 7, jack 8, and pad 9.

[0058] like Figure 7 As shown, is Figure 3 The cross-sectional view of section CC includes ground 4, reinforced concrete support 6, embedded hole 602, column 604, and protective cover 7; the column cross-sectional dimension of reinforced concrete support 6 is smaller than the vertical cross-sectional dimension of the upper protective cover 7, and the embedded hole 602 is located at the center of reinforced concrete support 6.

[0059] like Figure 8The diagram shown is a schematic of a reinforced concrete support column 6 in a case study, including a steel plate 5, a reinforced concrete support column 6, a column head 601, a pre-embedded hole 602, a groove 603, a column body 604, a protective cover 7, a jack 8, and a pad 9, demonstrating the specific form of the reinforced concrete support column 6.

[0060] like Figure 10 The diagram shown is a cross-sectional view of the reinforcement of a reinforced concrete column 6 in one example of the present invention, including the reinforced concrete column 6, column head 601, pre-embedded hole 602, groove 603, and column body 604; it also shows the height h and width c of the outer expansion of the column head 601. The reinforcement of the reinforced concrete column 6 must meet the specifications.

[0061] like Figure 11 The diagram shown is a cross-sectional view of a reinforced concrete support column 6 after the gas blasting device is installed inside the pre-embedded hole 602 in one example of the present invention. It includes a reinforced concrete support column 6, a column head 601, a pre-embedded hole 602, a column body 604, a fracturing tube 10, an activation tube 11, a liquid filling tube 12, an activation lead wire 13, and a drilling mud 14.

[0062] like Figure 12 The diagram shows a drilling and gas blasting device inside a doorway 2 without a reinforced concrete support 6, including the doorway 2, fracturing tube 10, ignition tube 11, liquid filling tube 12, ignition lead wire 13, and drilling mud 14.

[0063] like Figure 13 The diagram shown is a schematic diagram of the detonation network in one example of the present invention, including the collapse center line 3, the conductor 15, and the detonation power source 16.

[0064] A gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes includes the following steps:

[0065] Step 1: First, make several door openings 2 below the support cylinder wall 1. The door openings 2 are symmetrically distributed on both sides of the collapse center line on the inverted support cylinder wall 1.

[0066] Step 2: Insert the gas blasting device into the pre-embedded hole 602, and at the same time lead out the excitation lead wire 13 and the liquid filling pipe 12 from the groove 603;

[0067] Step 3: Replace the doorway 2 in Step 1 with an axially pre-embedded reinforced concrete column support system;

[0068] Step 4: Fill the gas blasting device with liquid, and connect the ignition pin 14 to the detonation power supply 16 through the wire 15 to form a detonation network;

[0069] Step 5: Clear the site, then detonate the network.

[0070] As a further improvement of the present invention, the liquid filled into the gas explosion device in step four is carbon dioxide, liquid oxygen or liquid nitrogen, and the carbon dioxide, liquid oxygen or liquid nitrogen is filled into the interior of the fracturing tube 10 through the filling tube 12.

[0071] As a further improvement of the present invention, in step three, the replacement method includes the following steps:

[0072] S1. When the number of door openings is odd, start from the first door opening 2 located on the collapse center line 3; when the number of door openings is even, start from the first door opening 2 on the side immediately adjacent to the collapse center line 3.

[0073] S2. Break the support cylinder wall 1 to form a doorway 2;

[0074] S3. On a flat ground 4, place the pad 9, jack 8, and protective cover 7 in sequence from bottom to top at the accurate position of the axial pre-embedded hole reinforced concrete column support system.

[0075] S4. Move the axial pre-embedded hole reinforced concrete support 6, which has been fitted with the gas blasting device, onto the protective cover 7.

[0076] S5. Place the steel plate 5 on the axially pre-embedded hole reinforced concrete support column 6;

[0077] S6. Lift jack 8. Once the axial pre-embedded hole reinforced concrete support system reaches the bearing requirements, stop lifting and complete the replacement of the first doorway 2.

[0078] S7. Use the same method to complete the construction of the remaining doorway 2, and proceed symmetrically towards both sides of the collapse centerline 3.

[0079] As a further improvement to the above method, the reinforced concrete support column 6 includes a column body 604 and a column head 601 located at the upper end of the column body 604. A groove 603 is provided on the top of the column head 601. The reinforced concrete support column 6 is prefabricated. The pre-embedded hole 602 is axially pre-embedded. The pre-embedded hole 602 is located in the middle of the reinforced concrete support column 6. The top of the pre-embedded hole 602 extends through to the upper end face of the column head 601 of the reinforced concrete support column 6 and communicates with the groove 603 on the upper end face of the column head 601.

[0080] As a further improvement to the above method, the cross-section of the reinforced concrete column 6 is rectangular or circular, and the column head of the reinforced concrete column 6 is expanded outward.

[0081] The aforementioned axial pre-embedded hole reinforced concrete column support system includes a reinforced concrete column 6 and a gas blasting device, which includes a fracturing tube 10, an activation tube 11, a liquid filling tube 12, an activation lead wire 13, and a stemming material 14.

[0082] Specifically, the fracturing tube 10 is installed inside the pre-embedded hole 602, the ignition tube 11 is set inside the fracturing tube 10, one end of the filling tube 12 is connected to the top of the fracturing tube 10, the other end of the filling tube 12 passes through the groove 603, the ignition lead wire 13 is used to detonate the fracturing tube 10, the other end of the ignition tube 11 passes through the groove 603, and the stemming clay 14 is filled in the groove 603 to fix the filling tube 12 and the ignition lead wire 13.

[0083] The aforementioned axial pre-embedded hole reinforced concrete column support system also includes a height adjustment mechanism, which includes a jack 8, a protective cover 7, and a pad 9. The jack 8 is installed above the pad 9, and the top of the output end of the jack 8 is fitted with a protective cover 7. The top of the protective cover 7 is in contact with the bottom of the reinforced concrete column 6.

[0084] Preferably, the width of a single doorway 2 is 1.2 to 3.0 m, and the doorways 2 are symmetrically distributed on both sides of the collapse centerline 3.

[0085] Preferably, the reinforced concrete column 6 is precast with high-strength concrete, and its strength grade is at least two levels higher than that of the original concrete of the tall structure.

[0086] Preferably, the reinforced concrete column 6 has a rectangular cross-section with dimensions of 400×400mm; the column head 601 of the reinforced concrete column 6 expands outward with a height of 200mm and a width of 200mm; the reinforcement of the reinforced concrete column 6 must meet the requirements of the specifications.

[0087] Preferably, the diameter of the pre-embedded hole 602 is 40mm, the top of the pre-embedded hole 602 penetrates through the upper end face of the column head 601 and communicates with the groove 603 on the upper end face of the column head 601; the bottom of the pre-embedded hole 602 extends to 30cm from the bottom surface of the reinforced concrete column 6.

[0088] Preferably, the drilling direction of the unreplaced doorway 2 is parallel to the direction of the cylinder wall.

[0089] Preferably, the pre-embedded hole 602 is made of an inflatable rod.

[0090] Optionally, the pre-embedded hole 602 is made of PVC pipe.

[0091] Preferably, the groove 603 of the column head 601 of the reinforced concrete column 6 is square.

[0092] Optionally, the groove 603 of the column head 601 of the reinforced concrete column 6 is arc-shaped.

[0093] Preferably, the protective cover 7 is made of metal; the thickness of the protective cover 7 is 3cm; the protective cover 7 is in the shape of an "open box" with a notch on one side; the vertical bearing surface dimension of the protective cover 7 is slightly larger than the cross-sectional dimension of the reinforced concrete support column 604; the internal height of the protective cover 7 is greater than the minimum height of the jack 8.

[0094] Preferably, the breaking of all doorway walls should ensure that the upper edge of the cut is flat and subjected to force, and the preferred breaking tools are wall saws and wire saws.

[0095] As a further improvement to the above method, when the number of door openings 2 is odd, the construction sequence of all door openings 2 is to replace the reinforced concrete support column 6 starting from the first door opening 2 located on the collapse center line 3, and then replace the reinforced concrete support column 6 at intervals of several door openings 2, until all door openings 2 are replaced.

[0096] When the number of door openings 2 is even, the construction sequence of all door openings 2 is to start by replacing the reinforced concrete support column 6 from the first door opening 2 on the side adjacent to the collapse center line 3, and then replace the reinforced concrete support column 6 at intervals of several door openings 2, until all door openings 2 are replaced.

[0097] As a further improvement to the above method, when the number of door openings 2 is odd, the construction sequence of all door openings 2 is to replace the reinforced concrete support column 6 starting from the first door opening 2 located on the collapse center line 3, and then replace the reinforced concrete support column 6 at intervals of individual door openings 2. After the replacement is completed, drill holes and install gas blasting devices in the remaining door openings 2.

[0098] When the number of door openings 2 is even, the construction sequence of all door openings 2 is to start by replacing the reinforced concrete support column 6 from the first door opening 2 on the side adjacent to the collapse center line 3, and then replace the reinforced concrete support column 6 at intervals of individual door openings 2. After the replacement is completed, drill holes and install gas blasting devices in the remaining door openings 2.

[0099] Furthermore, after destroying the supporting cylinder walls between all the doorways, the superstructure is supported by an axially pre-embedded hole reinforced concrete column support system (at this time, all supporting cylinder walls within the blasting cut are replaced by an axially pre-embedded hole reinforced concrete column support system).

[0100] As a further improvement to the above method, holes are drilled in the retaining support cylinder wall 1 between the door openings 2. The drilling time is before the installation of the axial pre-embedded hole reinforced concrete column support system. After the drilling is completed, a gas blasting device is installed and detonated simultaneously with the axial pre-embedded hole reinforced concrete column.

[0101] This invention also provides a gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes, as detailed below:

[0102] Step 1: Determine the direction of collapse of the tall structure based on the surrounding environment and structural characteristics of the tall structure; calculate the height and width of the doorway 2 required for the tall structure to collapse using empirical formulas.

[0103] Step 2: After accurate measurement, use paint to mark the positions of each doorway on the building's support cylinder wall 1. Then, according to the paint markings, use a breaking tool to open each doorway 2 on the building's support cylinder wall 1.

[0104] Step 3: Prefabricate reinforced concrete pillars 6 in advance according to the size and quantity of the doorway 2, and at the same time customize an appropriate number of gas blasting devices.

[0105] Step 4: Pre-remove the non-structural lining inside the tall structure; at the same time, set up shock-absorbing trenches in the direction of collapse.

[0106] Step 5: Place the gas blasting device into the pre-embedded hole 602 of the reinforced concrete support column 6, and at the same time lead out the excitation lead wire 13 and the liquid filling pipe 12 from the groove 603.

[0107] Step 6: Place the two unlifted jacks 8 on the pad plate 9 and put them in the protective cover 7, placing them in the accurate position supported by the reinforced concrete column 6.

[0108] Step 7: Use machinery to move the precast reinforced concrete support 6, which has been placed into the gas blasting device, onto the protective cover 7 and align it with the jack 8.

[0109] Step 8: After the reinforced concrete support column 6 has been moved, place the steel plate 5 on the two reinforced concrete support columns 6.

[0110] Step 9: Next, lift jack 8 until the reinforced concrete support 6 reaches the load-bearing requirements, then stop lifting to complete the replacement of the first doorway 2.

[0111] Step 10: Replace the remaining doorways 2 in the same way as the first doorway 2. The replacement sequence starts from the collapse center line 3 and proceeds to both sides one by one.

[0112] Step 11: After completing the above replacement work, fill the fracturing tube 10 with liquid and connect the ignition lead wire 13 to form an initiation network.

[0113] Step 12: After all preparations are completed, clear the blasting site; detonate after clearing.

[0114] This invention discloses a gas blasting demolition method using reinforced concrete support column 6. By breaking the supporting cylindrical wall 1 at the doorway 2 of a tall structure and replacing it with a reinforced concrete support column 6 equipped with a gas blasting device at the doorway 2, the tall structure can be demolished by blasting.

[0115] This invention not only greatly improves the safety of blasting demolition and ensures the accuracy of directional collapse, but also replaces traditional explosive blasting, eliminating complex safety approvals, simplifying the blasting network, and significantly reducing blasting vibration, noise, and dust, achieving a more environmentally friendly blasting demolition. This invention is applicable to the blasting demolition of tall structures such as chimneys, water towers, and silos made of various materials including brick, concrete, and reinforced concrete, and has a very wide range of applications.

[0116] 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.

[0117] Implementation Case 1:

[0118] Taking a 62.8m tall brick chimney from a brick factory as an example, the surrounding environment of the chimney is complex, and the safety of surrounding buildings must be ensured, making construction difficult. The top of the chimney has an outer diameter of 2.1m, an inner diameter of 1.86m, and a wall thickness of 240mm, while the bottom has an outer diameter of 5m, an inner diameter of 3.56m, and a wall thickness of 720mm.

[0119] Among them: the steel plate 5 has an arc length of 1.8m and 1.5m, a width of 0.72m, and a thickness of 2cm; the reinforced concrete column 6 has a column height of 1.8m, a column cross-section of 600×600mm, a column head 601 with an outward expansion height of 200mm, and a column head 601 with an outward expansion width of 200mm; the pre-embedded hole 602 has a vertical length of 1.5m, uses a PVC pipe with a wall thickness of 1mm and an outer diameter of 40mm, and an upper arc-shaped bend extending into the column head 601 with a radius of 500mm; the jack 8 plus the protective cover 7 has a total elevation of 40cm, a total height of 370mm, and a lifting height of 150mm; the protective cover 7 has a thickness of 20mm and 10mm, and a cross-section of 650×650mm.

[0120] The above-mentioned construction method for demolishing chimneys by breaking through walls and replacing columns includes the following steps:

[0121] Based on the surrounding environment and the structural characteristics of the chimney, the direction of the chimney's collapse was determined; based on empirical formulas, the required opening 2 for the chimney's collapse was calculated, with a cut height of 2.2m, a cut width of 9.5m, and a corresponding angle of 220°.

[0122] Three doorways 2 were made at the incision, symmetrically distributed on both sides of the collapse centerline 3, with the centerline located at the center of the first doorway; the widths of the doorways 2 were 1.75m, 2.0m, and 1.75m respectively, and the width of the two remaining support cylinder walls was 2.0m each; after precise measurement, the specific locations of the doorways 2 were marked with paint.

[0123] The non-structural lining inside the chimney was pre-removed; at the same time, shock-absorbing trenches were set up in the direction of the collapse.

[0124] Use a breaking tool to break the first doorway 2 that is adjacent to the collapse centerline 3. After cutting, level the ground 4 and the upper edge of the cut to ensure good force transmission.

[0125] The gas blasting device is placed into the pre-embedded hole 602 of the reinforced concrete support column 6, and the excitation lead wire 13 and the liquid filling pipe 12 are led out from the groove 603.

[0126] Place the two unlifted jacks 8 on the pad plate 9 and add protective covers 7, then place them at the accurate position supported by the reinforced concrete column 6.

[0127] Use machinery to move the reinforced concrete support 6, which has been placed with the gas blasting device, onto the protective cover 7 and align it with the jack 8.

[0128] After the reinforced concrete support column 6 has been moved, place the steel plate 5 on the two reinforced concrete support columns 6.

[0129] Next, lift jack 8 until the reinforced concrete support 6 reaches the load-bearing capacity, then stop lifting to complete the replacement of the first doorway 2.

[0130] The replacement method for the other two doorways 2 is the same as that for the first doorway. The replacement sequence starts from the collapse center line 3 and proceeds to both sides one by one until the construction of all three doorways is completed.

[0131] The two remaining support cylinder walls were removed, and the two holes formed were replaced with axially pre-embedded reinforced concrete support systems in the same way as the first doorway.

[0132] After completing the above preparations, all fracturing tubes 10 are filled with liquid; among them, the gas blasting device has a specification of 1Kg.

[0133] After all preparations are completed, the blasting site is cleared; the blasting is then detonated.

[0134] Implementation Case 2:

[0135] Taking a reinforced concrete chimney as an example, built in the 1990s, the chimney is 100m high, with an outer diameter of 8.0m at the bottom elevation of 0.0m, an outer diameter of 3.32m at the top, a wall thickness of 0.35m at the bottom, and gradually thickening to 0.8m from the bottom 1.2m to the bottom of the crossbeam at an elevation of 2.5m. The bottom 0.00 to 2.50m has no inner lining, refractory bricks, or insulation layer, while the insulation layer is 0.08m thick from the bottom 2.5 to 10m, and the inner lining is 0.24m thick.

[0136] The reinforced concrete support column 6 is prefabricated, including: steel plate 5 with arc lengths of 1.8m and 2.2m, width of 0.35m, and thickness of 2cm; the reinforced concrete support column 6 has a height of 2.4m, a column cross-section of 350×350mm, a column head 601 with an outward expansion height of 200mm, and an outward expansion width of 200mm; the pre-embedded hole 602 has a vertical length of 2m, uses PVC pipe with a wall thickness of 1mm and an outer diameter of 30mm, and an upper arc-shaped bend extending into the column head 601 with a radius of 400mm; the jack 8 plus the protective cover 7 has a total elevation of 40cm, a total height of 370mm, and a lifting height of 150mm; the protective cover 7 has a thickness of 20mm and 10mm, and a cross-section of 400×400mm.

[0137] The above-mentioned construction method for demolishing chimneys by breaking through walls and replacing columns includes the following steps:

[0138] Based on the surrounding environment and the structural characteristics of the chimney, the direction of the chimney's collapse was determined; based on empirical formulas, the required opening 2 for the chimney's collapse was calculated, with a cut height of 2.8m, a cut width of 15.0m, and a corresponding angle of 216°.

[0139] Seven doorways 2 were made in the incision, and the collapse center line 3 was located at the symmetrical center of the first doorway 2; the width of the doorway 2 was 2.5+2.0×5+2.5m, and the specific location of the doorway 2 was marked with paint after precise measurement.

[0140] The non-structural lining inside the chimney was pre-removed; at the same time, shock-absorbing trenches were set up in the direction of the collapse.

[0141] Use a breaking tool to break the first opening 2, which is immediately adjacent to the collapse centerline 3. After cutting, level the ground 4 and the upper edge of the cut to ensure good force transmission. Drill holes in the remaining support cylinder wall 1 in the opening 2, with the drilling direction perpendicular to the cutting surface of the opening 2.

[0142] The gas blasting device is placed in the pre-embedded hole 602 of the reinforced concrete support column 6 and the blast hole of the retaining support cylinder wall 1, and the excitation lead wire 13 and the liquid filling pipe 12 are led out from the groove 603.

[0143] Place the two unlifted jacks 8 on the pad plate 9 and add protective covers 7, then place them at the accurate position supported by the reinforced concrete column 6.

[0144] Use machinery to move the reinforced concrete support 6, which has been placed with the gas blasting device, onto the protective cover 7 and align it with the jack 8.

[0145] After the reinforced concrete support column 6 has been moved, place the steel plate 5 on the two reinforced concrete support columns 6.

[0146] Next, lift jack 8 until the reinforced concrete support 6 reaches the load-bearing capacity, then stop lifting to complete the replacement of the first doorway 2.

[0147] The replacement of the remaining doorways shall be carried out in the same way as the first doorway 2, with the replacement sequence starting from the collapse center line 3 and proceeding to both sides one by one.

[0148] After completing the above preparations, all fracturing tubes 10 are filled with liquid; among them, the gas blasting device has a specification of 1Kg.

[0149] After all preparations are completed, the blasting site is cleared; the blasting is then detonated.

[0150] Implementation Case 3:

[0151] Taking a certain chimney as an example, the chimney is 180m high and the body is made of C30 grade concrete. The outer diameter of the bottom and top is 16.6m and 5.8m respectively, and the wall thickness of the bottom and top is 460mm and 180mm respectively. At the bottom of the chimney at elevation 0, there are two 1.5×2.5m doorways in the north and south directions, with an outer diameter of 16.6m and a wall thickness of 460mm, without insulation layer or inner lining. At the chimney elevation of 8.1~13.7m, there are two 3.98×5.6m flue openings in the east and west directions, with an outer diameter of 15.2m and a wall thickness of 460mm. The insulation layer thickness is 100mm and the inner lining thickness is 240mm.

[0152] The reinforced concrete support column 6 is prefabricated, including: steel plate 5 with arc lengths of 2.2m and 2.6m, width of 0.50m, and thickness of 3cm; the reinforced concrete support column 6 has a height of 4.1m, a column cross-section of 500×700mm, a column head 601 with an outward extension height of 200mm, and an outward extension width of 200mm; the pre-embedded hole 602 has a vertical length of 3.5m, uses PVC pipe with a wall thickness of 1mm and an outer diameter of 40mm, and an upper arc-shaped bend extending into the column head 601 with a radius of 550mm; the jack 8 plus protective cover 7 has a total elevation of 40cm, a total height of 370mm, and a lifting height of 150mm; the protective cover 7 has a thickness of 20mm and 10mm, and a cross-section of 550×750mm.

[0153] The above-mentioned construction method for demolishing chimneys by breaking through walls and replacing columns includes the following steps:

[0154] Based on the surrounding environment and the structural characteristics of the chimney, the direction of the chimney's collapse was determined; based on empirical formulas, the required opening 2 for the chimney's collapse was calculated, with a cut height of 4.5m, a cut width of 31.1m, and a corresponding angle of 216°.

[0155] Twelve doorways 2 were created at the incision. The collapse centerline 3 was located at the first doorway 2, with the second, third, and fourth doorways 2 on either side. The width of each doorway 2 was 3.0 + 2.5 × 10 + 3.0 m. After precise measurement, the exact location of each doorway 2 was marked with paint.

[0156] The non-structural lining inside the chimney was pre-removed; at the same time, shock-absorbing trenches were set up in the direction of the collapse.

[0157] Use a breaking tool to break the first opening 2, which is immediately adjacent to the collapse centerline 3. After cutting, level the ground 4 and the upper edge of the cut to ensure good force transmission. Drill holes in the remaining support cylinder wall 1 in the opening 2, with the drilling direction perpendicular to the opening cut surface.

[0158] The gas blasting device is placed in the pre-embedded hole 602 of the reinforced concrete support column 6 and the blast hole of the retaining support cylinder wall 1, and the excitation lead wire 13 and the liquid filling pipe 12 are led out from the groove 603.

[0159] Place the two unlifted jacks 8 on the pad plate 9 and add protective covers 7, then place them at the accurate position supported by the reinforced concrete column 6.

[0160] Use machinery to move the reinforced concrete support 6, which has been placed with the gas blasting device, onto the protective cover 7 and align it with the jack 8.

[0161] After the reinforced concrete support column 6 has been moved, place the steel plate 5 on the two reinforced concrete support columns 6.

[0162] Next, lift jack 8 until the reinforced concrete support 6 reaches the load-bearing capacity, then stop lifting to complete the replacement of the first doorway 2.

[0163] The replacement of the remaining doorways shall be carried out in the same way as the first doorway 2, with the replacement sequence starting from the collapse center line 3 and proceeding to both sides one by one.

[0164] After completing the above preparations, the fracturing tube 10 is filled with liquid; the gas explosion device has a specification of 3Kg.

[0165] After all preparations are completed, the blasting site is cleared; the blasting is then detonated.

[0166] Implementation Case 4:

[0167] Taking a single-cavity hollow brick tower as an example, the brick tower has 7 floors, a height of 18.032m, a hexagonal plan, a side length of 6.0m, and a wall thickness of 960mm.

[0168] The reinforced concrete support column 6 is prefabricated, including: steel plate 5 with a length of 2.6m, a width of 0.96m, and a thickness of 3cm; the reinforced concrete support column 6 has a height of 1.2m and 0.9m, a column cross-section of 900×900mm, a column head 601 with an outward expansion height of 200mm, and an outward expansion width of 200mm; the pre-embedded holes 602 have vertical lengths of 0.8m and 0.5m, are made of PVC pipe with a wall thickness of 1mm and an outer diameter of 40mm, and have an upper arc-shaped bend extending into the column head 601 with a radius of 550mm; the jack 8 plus the protective cover 7 has a total elevation of 40cm, a total height of 370mm, and a lifting height of 150mm; the protective cover 7 has a thickness of 30mm and a cross-section of 950×950mm.

[0169] The above-mentioned construction method for demolishing the brick tower by breaking through the wall and replacing the column includes the following steps:

[0170] Based on the surrounding environment and the structural characteristics of the brick tower, the direction of its collapse was determined. Using empirical formulas, the required opening 2 for the collapse was calculated, with a cut height of 1.6m and a cut width of 20m. The center of collapse was perpendicular to one side of the regular hexagon and bisected that side.

[0171] Six doorways 2 are to be constructed. Doorway 2 is 3.0 × 6 m wide, with 1 m of material removed from each side to form a 20 m wide cut. The doorway is located in the middle of the replacement cut to reduce the amount of excavation. After precise measurement, the exact location of doorway 2 is marked with paint.

[0172] The non-structural lining inside the chimney was pre-removed; at the same time, shock-absorbing trenches were set up in the direction of the collapse.

[0173] Use a breaking tool to break the first opening 2, which is immediately adjacent to the collapse centerline 3. After cutting, level the ground 4 and the upper edge of the cut to ensure good force transmission. Drill holes in the remaining supporting wall 1 through the opening 2, with the drilling direction parallel to the plane where the supporting wall 1 is located.

[0174] The gas blasting device is placed in the pre-embedded hole 602 of the reinforced concrete support column 6 and the blast hole of the retaining support cylinder wall 1, and the excitation lead wire 13 and the liquid filling pipe 12 are led out from the groove 603.

[0175] Place the two unlifted jacks 8 on the pad plate 9 and add protective covers 7, then place them at the accurate position supported by the reinforced concrete column 6.

[0176] Use machinery to move the reinforced concrete support 6, which has been placed with the gas blasting device, onto the protective cover 7 and align it with the jack 8.

[0177] After the reinforced concrete support column 6 has been moved, place the steel plate 5 on the two reinforced concrete support columns 6.

[0178] Next, lift jack 8 until the reinforced concrete support 6 reaches the load-bearing capacity, then stop lifting to complete the replacement of the first doorway 2.

[0179] The replacement of the remaining doorways shall be carried out in the same way as the first doorway 2, with the replacement sequence starting from the collapse center line 3 and proceeding to both sides one by one.

[0180] After completing the above preparations, the fracturing tube 10 is filled with liquid; the gas explosion device has a specification of 1Kg.

[0181] After all preparations are completed, the blasting site is cleared; the blasting is then detonated.

[0182] As can be seen from the implementation examples, this invention discloses a gas blasting demolition method using reinforced concrete support columns 6. By breaking through part of the supporting cylinder wall 1 of the tall structure to form a doorway 2, and replacing the doorway 2 with a reinforced concrete support column 6 with an axially embedded pipe, a gas blasting device is installed in the pre-embedded hole 602 of the reinforced concrete support column 6 to blast and detonate, thereby realizing the blasting demolition of the tall structure.

[0183] This invention can not only greatly improve the safety of blasting demolition and ensure the accuracy of directional collapse, but also replace traditional explosive blasting, eliminate complicated safety approvals, simplify the blasting network, and significantly reduce blasting vibration, blasting noise and blasting dust, thus achieving greener blasting demolition.

[0184] This invention is applicable to the demolition of tall structures such as chimneys, water towers, and silos made of various materials including brick, concrete, and reinforced concrete, and has a very wide range of applications.

[0185] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for gas blasting demolition of reinforced concrete columns using axially pre-embedded holes, characterized in that: The steps include the following: Step 1: First, paint several door openings (2) below the support cylinder wall (1). The door openings (2) are symmetrically distributed on both sides of the collapse center line on the support cylinder wall (1). When the number of door openings (2) is odd, start from the first door opening (2) located on the collapse center line (3); when the number of door openings (2) is even, start from the first door opening (2) on the side adjacent to the collapse center line (3) and break the support cylinder wall (1) to form door openings (2); Step 2: Insert the gas blasting device into the pre-embedded hole (602) of the reinforced concrete column (6), and at the same time lead out the excitation line (13) and the liquid filling pipe (12) from the groove (603); Step 3: Place the axial pre-embedded hole reinforced concrete column support system in the doorway (2) in Step 1. Specifically, this includes: S1, on a flat ground (4), stack the pad (9), jack (8), and protective cover (7) from bottom to top in the accurate position to be supported by the axial pre-embedded hole reinforced concrete column support system; S2, move the axial pre-embedded hole reinforced concrete column (6) with the gas blasting device installed onto the protective cover (7); S3, place the steel plate (5) on the axial pre-embedded hole reinforced concrete column (6); S4, lift the jack (8), and stop lifting when the axial pre-embedded hole reinforced concrete column support system reaches the bearing requirement, thus completing the replacement of the first doorway (2); S5, use the same method to complete the construction of the remaining doorways (2), with the construction sequence being symmetrically proceeding towards both sides of the collapse centerline (3); Step 4: Fill the gas blasting device with liquid, and connect the excitation pin wire (13) to the detonation power supply (16) through the wire (15) to form a detonation network; Step 5: Clear the site, and then activate the detonation network; The reinforced concrete support column (6) in Step 2 includes a column body (604) and a column head (601) located at the upper end of the column body (604). The top of the column head (601) is provided with a groove (603). The reinforced concrete support column (6) is prefabricated. The pre-embedded hole (602) is set in the middle of the reinforced concrete support column (6). The top of the pre-embedded hole (602) extends to the upper end face of the column head (601) of the reinforced concrete support column and communicates with the groove (603) on the upper end face of the column head (601); The axial pre-embedded hole reinforced concrete support system in Step 3 includes a reinforced concrete support column (6), a gas blasting device and a support device.

2. The gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes according to claim 1, characterized in that: The cross-section of the reinforced concrete column (6) is rectangular or circular, the column head (601) of the reinforced concrete column (6) is expanded outward, and the pre-embedded hole (602) is axially pre-embedded.

3. A gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes according to claim 1, characterized in that: The gas blasting device is installed inside the pre-embedded hole (602). The gas blasting device includes a fracturing tube (10), an activation tube (11), a liquid filling tube (12), an activation lead wire (13), and stemming material (14). The support device includes a jack (8), a protective cover (7), and a pad (9). The jack (8) is installed above the pad (9). The top of the output end of the jack (8) is equipped with a protective cover (7). The top of the protective cover (7) is attached to the bottom of the reinforced concrete support column (6).

4. A gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes according to claim 1, characterized in that: In step four, the liquid filled into the gas explosion device is one of carbon dioxide, liquid oxygen or liquid nitrogen, and the carbon dioxide, liquid oxygen or liquid nitrogen is filled into the inside of the fracturing tube (10) through the filling tube (12).

5. A gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes according to claim 1, characterized in that: When the number of door openings (2) is odd, the construction sequence of all door openings (2) is to replace the reinforced concrete pillars (6) starting from the first door opening (2) located on the collapse center line (3), and then replace the reinforced concrete pillars (6) at intervals of several door openings (2) until all door openings (2) are replaced; when the number of door openings (2) is even, the construction sequence of all door openings (2) is to replace the reinforced concrete pillars (6) starting from the first door opening (2) on the side adjacent to the collapse center line (3), and then replace the reinforced concrete pillars (6) at intervals of several door openings (2) until all door openings (2) are replaced.

6. A gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes according to claim 5, characterized in that: When the number of door openings (2) is odd, the construction sequence of all door openings (2) shall be to replace the reinforced concrete pillars (6) starting from the first door opening (2) located on the collapse center line (3), and then replace the reinforced concrete pillars (6) at intervals of individual door openings (2). After the replacement is completed, the remaining door openings (2) shall be drilled and gas blasting devices shall be installed. When the number of door openings (2) is even, the construction sequence of all door openings (2) shall be to replace the reinforced concrete pillars (6) starting from the first door opening (2) on the side adjacent to the collapse center line (3), and then replace the reinforced concrete pillars (6) at intervals of individual door openings (2). After the replacement is completed, the remaining door openings (2) shall be drilled and gas blasting devices shall be installed.

7. A gas blasting demolition method for reinforced concrete columns using axially pre-embedded holes according to claim 1, characterized in that: Drill holes in the retaining support cylinder wall (1) between the door openings (2) before installing the axial pre-embedded hole reinforced concrete column support system; after drilling, install the gas blasting device and detonate it simultaneously with the axial pre-embedded hole reinforced concrete column.

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