CN113654423B - Green demolition method for mechanical cutting and remote blasting of pre-buried holes of reinforced concrete beam and column - Google Patents
Green demolition method for mechanical cutting and remote blasting of pre-buried holes of reinforced concrete beam and column Download PDFInfo
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- CN113654423B CN113654423B CN202111014060.5A CN202111014060A CN113654423B CN 113654423 B CN113654423 B CN 113654423B CN 202111014060 A CN202111014060 A CN 202111014060A CN 113654423 B CN113654423 B CN 113654423B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/08—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with saw-blades of endless cutter-type, e.g. chain saws, i.e. saw chains, strap saws
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/02—Particular applications of blasting techniques for demolition of tall structures, e.g. chimney stacks
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Abstract
The application discloses a method for mechanically cutting embedded holes of reinforced concrete beams and columns and blasting green demolishing the embedded holes in different places, which uses the concept of green construction and the concept of full life, adopts two embedded holes, namely a rope penetrating hole and an axial hole, arranged on the reinforced concrete beams or columns, fully utilizes the advantages of mechanical cutting and blasting crushing modes, and realizes the green demolishing without drilling, low cost and low environmental impact; the application is suitable for the dismantling of temporary reinforced concrete beams or columns such as foundation pit supports in the near term and can be used for the dismantling of all reinforced concrete beams or columns in the long term.
Description
Technical Field
The application relates to the field of demolition of reinforced concrete structures, in particular to a green demolition method for mechanical cutting and remote blasting of embedded holes of reinforced concrete beams and columns.
Background
In engineering construction, the dismantling of reinforced concrete beams or columns is quite common. At present, mechanical demolition and blasting demolition are mostly adopted. The mechanical demolition mainly comprises a breaking hammer breaking process, a mechanical cutting and hoisting process. The breaking hammer has lower breaking process efficiency, also has larger noise and dust pollution, and gradually loses advantages in the urban area with dense personnel; the mechanical cutting and hoisting process has the advantages of low noise, low dust pollution, high efficiency and the like, and is widely used at present. Mechanical cutting is divided into two popular processes: the disc type concrete cutting machine and the rope saw cutting machine have higher efficiency than a rope saw, but have limited cutting depth and larger noise; rope saw cutting can cope with cutting of beams or columns of various sizes and is less noisy but less efficient than disc cutters. The beam Duan Huo column sections cut by the mechanical cutting + hoisting process often require secondary crushing to recover the aggregate and rebar, often also with breaking hammers. Such a combination operation results in a higher overall cost thereof. The blasting demolition process is an explosive blasting and static expanding agent crushing process. The static expanding agent crushing process needs multiple drilling holes, the drilling cost is too high, and the static expanding agent crushing process is not suitable for dismantling reinforced concrete structures with higher reinforcement ratio; the explosive blasting process has high efficiency, and the recently developed pre-buried hole blasting demolition process can realize the demolition of drilling-free blasting. However, the inherent detrimental effects of explosive blasting, such as vibration, flyrock, dust, noise, and shock waves, cause the blast demolition to gradually lose urban building demolition service. In order to fully utilize the advantages of the mechanical cutting and blasting demolition processes while avoiding their drawbacks as much as possible, it is necessary to develop a new process.
Disclosure of Invention
The application aims to overcome the defects and provide a method for mechanically cutting embedded holes of reinforced concrete beams and columns and blasting green demolishing the reinforced concrete beams and columns in different places, which considers the problem of beam and column demolishing in advance at the beginning of the design construction of the reinforced concrete beams or columns, and achieves the aims of fully utilizing the advantages of mechanical cutting and explosive blasting crushing, and realizing the green demolishing without drilling, low cost, low environmental impact and high efficiency by arranging two embedded holes in the reinforced concrete beams or columns.
The application aims to solve the technical problems, and adopts the technical scheme that: a method for mechanically cutting pre-buried holes of reinforced concrete beams and columns and demolishing the pre-buried holes in different places is characterized in that axial holes parallel to the longitudinal axes of the beams or columns are arranged in the construction period of the reinforced concrete beams or columns, and two ends of the axial holes are blocked by gypsum; when the reinforced concrete beam or column needs to be dismantled, the steps are as follows:
1) Sectionally cutting along the longitudinal axis of the reinforced concrete beam or column by adopting a rope saw;
2) Hoisting in sections and transporting to a centralized crushing site;
3) And (3) loading explosive into the axial hole of each section of reinforced concrete beam or column, inserting detonator into the explosive, guiding the leg wire to the outside of the axial hole, and detonating and crushing after the two ends of the axial hole are blocked.
In another method for mechanically cutting and demolishing embedded holes of reinforced concrete beams and columns in different places, axial holes parallel to the longitudinal axes of the beams or columns are arranged in the construction period of the reinforced concrete beams or columns, and two ends of the axial holes are blocked by gypsum; and a rope penetrating hole is arranged in a cross section of the reinforced concrete beam or column at intervals along the longitudinal direction of the reinforced concrete beam or column, wherein the cross section is a cutting plane in subsequent dismantling, and two ends of the rope penetrating hole are blocked by gypsum; when the reinforced concrete beam or column needs to be dismantled, the steps are as follows:
1) Cutting off the reinforced concrete outside the rope saw blade surrounding ring at the cutting plane;
2) Clearing plugs at two ends of the rope threading hole, and penetrating the rope saw blade from openings at two ends of the rope threading hole;
3) Starting the rope saw to cut the reinforced concrete along the cutting plane until the reinforced concrete is cut off;
4) Hoisting each section of cut reinforced concrete beam or column by a crane, and transporting to a centralized crushing site;
5) And (3) charging the explosive in the axial hole of each section of reinforced concrete beam or column, inserting a detonator into the explosive, guiding the leg wire to the outside of the axial hole, and detonating and crushing after the two ends of the axial hole are blocked.
Preferably, when the rope penetrating holes are arranged in one cross section of the reinforced concrete beam or column at intervals along the longitudinal direction of the reinforced concrete beam or column, the middle parts of the rope penetrating holes are clung to the inner sides of longitudinal ribs on the periphery of the reinforced concrete beam or column, and two ends of the rope penetrating holes are blocked by gypsum and extend to the side surfaces of the reinforced concrete beam or column; when the reinforced concrete beam or column needs to be dismantled, the step 1) specifically comprises the following steps: and cutting the reinforced concrete outside the rope saw blade surrounding ring by using a disc cutter on the cutting plane.
Preferably, the axis of the rope threading hole is in a straight line or curve shape or in a shape formed by connecting circular arcs with straight lines.
Preferably, the rope penetrating holes are formed by adopting pre-buried PVC plastic pipes.
Preferably, the PVC plastic pipe forming the rope threading hole is bound on the longitudinal ribs by iron wires.
Preferably, the rope penetrating hole has an inner diameter of 15-25 mm.
Preferably, the axial hole is formed by adopting a pre-buried PVC plastic pipe.
Preferably, the PVC plastic pipe with the axial holes is fastened on the longitudinal ribs of the beam or the column respectively after being tensioned by four iron wires in four directions every 1-2 m.
Preferably, the inner diameter of the axial bore is 40-100 mm.
The application has the following beneficial effects:
(1) The application uses the design concept of full life, considers demolition at the beginning of the construction of reinforced concrete beams or columns, is the latest development of green building theory, can be used in temporary reinforced concrete beams or columns (such as foundation pit supports) demolition projects recently, and has revolutionary influence on the design, construction and demolition of reinforced concrete beams or columns once new reinforced concrete structural design specifications (including assembled reinforced concrete beams and columns) of permanent buildings are developed in the future.
(2) The technical scheme provided by the application fully and comprehensively utilizes the advantages of small environmental impact of mechanical cutting (rope saw cutting) and high explosive blasting efficiency, avoids complex urban environment, changes the process of blasting and crushing reinforced concrete in concentrated crushing sites (such as remote sites around cities, such as abandoned mountain holes and mountain furrows far away from residential areas), and can realize the purposes of low cost, low environmental impact and high efficiency green demolition; the process for intensively treating the reinforced concrete beam and column can produce construction waste (crushed concrete and reinforcing steel bars) which is more convenient to recycle, and can promote the development of new industry for recycling the solid waste of the construction.
(3) According to the technical scheme provided by the application, by arranging the two pre-buried holes, drilling can be avoided during on-site rope saw cutting, drilling is not required during blasting, drilling in reinforced concrete densely distributed with reinforcing steel bars (a drill bit is easy to contact with the reinforcing steel bars, the drill bit is damaged, and the cost is high) is avoided, and the drilling cost and time are saved.
(4) According to the technical scheme provided by the application, through arranging the rope threading holes, the disc type cutting machine and the rope saw type cutting machine can be simultaneously utilized, the advantages of high efficiency of cutting reinforced concrete by the disc type cutting machine and low environmental influence of the rope saw type cutting machine can be fully utilized, the cutting progress is quickened, and the method has great significance in occasions with tense requirements in construction periods.
(5) The application provides a plurality of arrangement modes and combination modes of rope penetrating holes and axial holes, and can solve the problem of green dismantling of beams or columns with different cross sections (such as circular cross sections and polygonal cross sections), different reinforcement rates and different construction conditions.
Drawings
FIG. 1 is a schematic cross-sectional view of a reinforced concrete beam or column after placement of an axial bore;
FIG. 2 is a schematic cross-sectional view of a reinforced concrete beam or column with rope holes disposed adjacent three lateral longitudinal ribs;
FIG. 3 is a schematic cross-sectional view of a reinforced concrete beam or column with rope holes disposed adjacent two lateral longitudinal ribs;
FIG. 4 is a schematic cross-sectional view of a reinforced concrete beam or column with rope holes disposed adjacent to two non-adjacent lateral longitudinal ribs;
FIG. 5 is a schematic cross-sectional view of a reinforced concrete beam or column with a rope hole disposed against a lateral longitudinal rib;
fig. 6 is a schematic view of the charge structure of a section of reinforced concrete beam or column cut according to the present application;
in the figure, 1-longitudinal ribs, 2-stirrups, 3-rope holes, 4-axial holes, 5-rope saw blades, 6-explosive rolls, 7-blocking sections, 8-detonators and 9-foot lines.
Detailed Description
The application is described in further detail below with reference to the drawings and the specific examples.
As shown in fig. 1 to 6, in a method for mechanically cutting and demolishing embedded holes of reinforced concrete beams or columns in different places, axial holes 4 parallel to the longitudinal axes of the beams or columns are arranged in the construction period of the reinforced concrete beams or columns, and both ends of the axial holes 4 are blocked by gypsum; when the reinforced concrete beam or column needs to be dismantled, the steps are as follows:
1) Sectionally cutting along the longitudinal axis of the reinforced concrete beam or column by adopting a rope saw;
2) Hoisting in sections and transporting to a centralized crushing site; in the embodiment, the transportation can be carried out by adopting a truck;
3) Explosive is filled in the axial hole 4 of each section of reinforced concrete beam or column, a detonator 8 is inserted into the explosive, the leg wires 9 are led out of the axial hole 4, and the two ends of the axial hole 4 are blocked and then detonated and broken.
In another method for mechanically cutting embedded holes of reinforced concrete beams and columns and blasting green demolishing the reinforced concrete beams and columns in different places, axial holes 4 parallel to the longitudinal axes of the beams or columns are arranged in the construction period of the reinforced concrete beams or columns, and two ends of the axial holes 4 are blocked by gypsum; and the rope penetrating holes 3 are arranged in a cross section of the reinforced concrete beam or column at intervals along the longitudinal direction of the reinforced concrete beam or column, wherein the cross section is a cutting plane in the subsequent dismantling process, and two ends of the rope penetrating holes 3 are blocked by gypsum; when the reinforced concrete beam or column needs to be dismantled, the steps are as follows:
1) Cutting off the reinforced concrete outside the surrounding ring of the rope saw blade 5 at the cutting plane;
2) Clearing plugs at two ends of the rope threading hole 3, and penetrating the rope saw blade 5 from openings at two ends of the rope threading hole 3;
3) Starting the rope saw to cut the reinforced concrete along the cutting plane until the reinforced concrete is cut off;
4) Hoisting each section of cut reinforced concrete beam or column by a crane, and transporting to a centralized crushing site; in the embodiment, the transportation can be carried out by adopting a truck;
5) And (3) charging the steel reinforced concrete beams or columns in the axial holes 4 of each section, inserting detonators 8 into the explosives, guiding leg wires 9 out of the axial holes 4, and detonating and crushing after the two ends of the axial holes 4 are blocked.
Further, when the rope penetrating holes 3 are arranged in one cross section of the reinforced concrete beam or column at intervals along the longitudinal direction of the reinforced concrete beam or column, the middle parts of the rope penetrating holes 3 are clung to the inner sides of the longitudinal ribs 1 at the periphery of the reinforced concrete beam or column, and two ends of the rope penetrating holes 3 are blocked by gypsum and extend to the side surfaces of the reinforced concrete beam or column; when the reinforced concrete beam or column needs to be dismantled, the step 1) specifically comprises the following steps: the reinforced concrete is cut at the cutting plane with a disk cutter except for the surrounding ring of the rope saw blade 5.
Further, the axis of the rope threading hole 3 is in a straight line or curve shape, or in a shape formed by connecting circular arcs to straight lines.
Further, the rope threading hole 3 is formed by adopting a pre-buried PVC plastic pipe.
Further, the PVC plastic pipe forming the rope threading hole 3 is bound on the longitudinal rib 1 by iron wires.
Further, the inner diameter of the rope penetrating hole 3 is 15-25 mm.
Further, the axial hole 4 is formed by adopting a pre-buried PVC plastic pipe.
Further, the PVC plastic pipe forming the axial hole 4 is fastened on the longitudinal ribs 1 of the beam or the column respectively after being tensioned by four iron wires in four directions every 1-2 m.
Further, the inner diameter of the axial hole 4 is 40-100 mm.
Example 1:
a reinforced concrete supporting beam of a foundation pit, the strength C25 of the beam body, the thickness of the protective layer is 35mm, the width of the section is 1.0m, and the height is 0.8m; a PVC plastic pipe with the inner diameter of 50mm is arranged in advance along the axis of the longitudinal axis of the support beam to form an axial hole, the length of the embedded pipe is equal to the length of the support beam, and both ends of the embedded pipe are blocked by gypsum.
When the reinforced concrete supporting beam is dismantled, the steps are as follows:
1) Sectioning (as shown in fig. 1) along the support beam by using a rope saw, wherein the sectioning length is 4.5 m;
2) Hoisting in sections and transporting to a centralized crushing site by using a truck;
3) Emulsion explosive cartridges with the diameter of 35mm are continuously filled in the axial holes of each section of supporting beam, detonators are inserted into one of the explosive cartridges, leg wires are led out of the axial holes, and two ends of the axial holes are blocked by stemming for 0.5 m and then detonated and broken.
Example 2
The section of a certain reinforced concrete column is square, the side length is 1.6m, the column body concrete strength C35 and the thickness of the protective layer are 40mm; 4 PVC embedded pipes which are parallel to the longitudinal axis of the column and have the diameter of 40mm are arranged on the diagonal line of the section in advance to form 4 embedded axial holes, each axial hole passes through the center of the section of the column to the midpoint of each angle, and the length of each axial hole is the same as the height of the column; two PVC pipes with the diameter of 25mm are arranged in one cross section of the column at intervals of 2m along the longitudinal direction of the column to form linear rope penetrating holes, the middle parts of the rope penetrating holes are clung to the inner sides of two opposite side peripheral longitudinal ribs of the column, two ends of each rope penetrating hole are blocked by gypsum, and the two ends of each rope penetrating hole extend to the side surfaces of the column (shown in figure 4); the cross section is the cutting plane where cutting occurs. When the reinforced concrete column is dismantled, the steps are as follows:
1) Cutting the reinforced concrete (namely, longitudinal ribs and a concrete protective layer outside two linear rope penetrating holes) at the part outside the rope saw blade surrounding ring by using a disc cutter on the cutting plane;
2) Clearing plugs at two ends of the rope threading hole, and penetrating the rope saw blade (shown in fig. 4) from openings at two ends of the rope threading hole;
3) Starting the rope saw to cut the reinforced concrete along the cutting plane until the reinforced concrete is cut off;
4) And hoisting each section of the cut reinforced concrete column by using a crane, and transporting the reinforced concrete column to a centralized crushing site by using a truck.
5) And filling explosive into all axial holes of each section of reinforced concrete column, continuously filling emulsion explosive cartridges with the diameter of 32mm, inserting detonators into one explosive cartridge in each blast hole, guiding leg wires to the outside of the axial holes, blocking the two ends of the axial holes by stemming for 0.5 m, and then detonating and crushing.
Example 3
The reinforced concrete beam has rectangular cross section, the beam body concrete strength C35, the thickness of the protective layer 35mm, the cross section height 1.2m and the height 0.8m. 2 PVC embedded pipes with the diameter of 40mm are embedded in a longitudinal symmetry plane of the reinforced concrete beam to form 2 embedded axial holes, each axial hole is parallel to the longitudinal axis of the reinforced concrete beam, the distances between the two axial holes and the upper surface and the lower surface are 40 cm respectively, and the lengths of the axial holes are the same as those of the reinforced concrete beam; PVC pipes with the diameter of 25mm are arranged nearby three adjacent side surfaces in a cross section of the reinforced concrete beam at intervals of 4m along the longitudinal direction of the reinforced concrete beam to form a broken line type rope penetrating hole, the rope penetrating hole is tightly clung to the inner sides of longitudinal ribs of the periphery of three adjacent side surfaces of the reinforced concrete beam, corners of the rope penetrating hole are connected by elbows, two ends of the rope penetrating hole are blocked by gypsum, and two ends of the rope penetrating hole extend to one side surface of the reinforced concrete beam (shown in figure 2); the cross section is the cutting plane where cutting occurs. When the reinforced concrete beam is dismantled, the steps are as follows:
1) Cutting the reinforced concrete (namely, longitudinal ribs and a concrete protective layer outside the rope threading hole) at the part outside the rope saw blade surrounding ring by using a disc cutter on the cutting plane;
2) Clearing plugs at two ends of the rope threading hole, and penetrating the rope saw blade (shown in figure 2) from openings at two ends of the rope threading hole;
3) Starting the rope saw to cut the reinforced concrete along the cutting plane until the reinforced concrete is cut off;
4) And hoisting each section of the cut reinforced concrete column by using a crane, and transporting the reinforced concrete column to a centralized crushing site by using a truck.
5) And (3) charging in two axial holes (namely blast holes) of each section of reinforced concrete column, continuously charging emulsion explosive cartridges with the diameter of 32mm, inserting detonators into one explosive cartridge in each blast hole, guiding foot lines out of the holes, blocking the two ends of the blast hole by stemming by 0.5 m, and then detonating and crushing.
In addition, the following 5 different embodiments are also formed according to the different arrangement modes of the axial holes and the rope penetrating holes:
FIG. 1 is a schematic cross-sectional view of one embodiment of a reinforced concrete beam or column of rectangular cross-section without a stringing hole, the rope saw would cut the entire cross-section;
FIG. 2 is a schematic cross-sectional view of one embodiment of a reinforced concrete beam or column of rectangular cross-section with rope holes disposed against three adjacent side longitudinal ribs, a rope saw would cut most of the cross-section;
FIG. 3 is a schematic cross-sectional view of one embodiment of a reinforced concrete beam or column of rectangular cross-section with rope holes disposed against two adjacent side longitudinal ribs, the rope saw cutting a majority of the cross-section of the two adjacent surfaces;
FIG. 4 is a schematic cross-sectional view of one embodiment of a reinforced concrete beam or column of rectangular cross-section with rope holes disposed adjacent two non-adjacent lateral longitudinal ribs, the rope saw cutting a majority of the cross-section of the upper and lower surfaces;
fig. 5 is a schematic cross-sectional view of one embodiment of a reinforced concrete beam or column of rectangular cross-section with a rope hole disposed against one side longitudinal bar, and a rope saw cutting out a majority of the cross-section of the upper surface.
The above embodiments are merely preferred embodiments of the present application, and should not be construed as limiting the present application, and the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without collision. The protection scope of the present application is defined by the claims, and the protection scope includes equivalent alternatives to the technical features of the claims. I.e., equivalent replacement modifications within the scope of this application are also within the scope of the application.
Claims (8)
1. A method for mechanically cutting pre-buried holes of reinforced concrete beams and columns and blasting green demolishing the pre-buried holes in different places is characterized in that: arranging axial holes (4) parallel to the longitudinal axis of the beam or column in the construction period of the reinforced concrete beam or column, wherein both ends of the axial holes (4) are blocked by gypsum; and the rope penetrating holes (3) are arranged in a cross section of the reinforced concrete beam or column at intervals along the longitudinal direction of the reinforced concrete beam or column, wherein the cross section is a cutting plane in the subsequent dismantling process, and two ends of the rope penetrating holes (3) are blocked by gypsum; when the reinforced concrete beam or column needs to be dismantled, the steps are as follows:
1) Cutting off part of reinforced concrete outside the surrounding ring of the rope saw blade (5) on a cutting plane;
2) Cleaning plugs at two ends of the rope threading hole (3), and penetrating the rope saw blade (5) from openings at two ends of the rope threading hole (3);
3) Starting the rope saw to cut the reinforced concrete along the cutting plane until the reinforced concrete is cut off;
4) Hoisting each section of cut reinforced concrete beam or column by a crane, and transporting to a centralized crushing site;
5) Charging the inside of an axial hole (4) of each section of reinforced concrete beam or column, inserting a detonator (8) into the explosive, guiding a leg wire (9) to the outside of the axial hole (4), and detonating and crushing after the two ends of the axial hole (4) are blocked;
the centralized crushing site is a abandoned mountain cave around the city or a mountain ditch far away from a residential area;
when the rope penetrating holes (3) are arranged in one cross section of the reinforced concrete beam or column at intervals along the longitudinal direction of the reinforced concrete beam or column, the middle parts of the rope penetrating holes (3) are clung to the inner sides of the longitudinal ribs (1) on the periphery of the reinforced concrete beam or column, and two ends of the rope penetrating holes (3) are blocked by gypsum and extend to the side surfaces of the reinforced concrete beam or column; when the reinforced concrete beam or column needs to be dismantled, the step 1) specifically comprises the following steps: a disk cutter is used for cutting the reinforced concrete at the cutting plane except the part outside the surrounding ring of the rope saw blade (5).
2. The method for mechanically cutting and demolishing embedded holes of reinforced concrete beams and columns and blasting off-site green according to claim 1, wherein the method comprises the following steps: the axis of the rope threading hole (3) is in a straight line or curve shape or in a shape formed by connecting circular arcs with straight lines.
3. The method for mechanically cutting and demolishing embedded holes of reinforced concrete beams and columns and blasting off-site green according to claim 1, wherein the method comprises the following steps: the rope penetrating hole (3) is formed by adopting a pre-buried PVC plastic pipe.
4. The method for mechanically cutting and demolishing embedded holes of reinforced concrete beams and columns and blasting off-site green according to claim 3, wherein the method comprises the following steps: the PVC plastic pipe forming the rope threading hole (3) is bound on the longitudinal rib (1) by iron wires.
5. The method for mechanically cutting and demolishing embedded holes of reinforced concrete beams and columns and blasting off-site green according to claim 1, wherein the method comprises the following steps: the inner diameter of the rope penetrating hole (3) is 15-25 mm.
6. The method for mechanically cutting and demolishing embedded holes of reinforced concrete beams and columns and blasting off-site green according to claim 1, wherein the method comprises the following steps: the axial hole (4) is formed by adopting a pre-buried PVC plastic pipe.
7. The method for mechanically cutting and demolishing embedded holes of reinforced concrete beams and columns and blasting off-site in green according to claim 6, wherein the method comprises the following steps: the PVC plastic pipe forming the axial hole (4) is respectively tied on the longitudinal ribs (1) of the beam or the column after being tensioned by four iron wires in four directions every 1-2 m.
8. The method for mechanically cutting and demolishing embedded holes of reinforced concrete beams and columns and blasting off-site green according to claim 1, wherein the method comprises the following steps: the inner diameter of the axial hole (4) is 40-100 mm.
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| CN202111014060.5A CN113654423B (en) | 2021-08-31 | 2021-08-31 | Green demolition method for mechanical cutting and remote blasting of pre-buried holes of reinforced concrete beam and column |
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| JP4201633B2 (en) * | 2003-03-28 | 2008-12-24 | 三井住友建設株式会社 | Blasting and dismantling method of reinforced concrete structure |
| CN103510523B (en) * | 2013-10-24 | 2014-10-29 | 何金城 | Sectional cutting and overall craning method for supporting beam in deep foundation pit multilayered reinforced concrete |
| CN104215136B (en) * | 2014-09-01 | 2016-01-06 | 武汉宏伟交通***工程有限公司 | Reinforced beam demolition blasting blast hole projectile filling, blocking and pressure slag structure and demolition blasting method |
| CN104964623B (en) * | 2015-07-01 | 2017-01-11 | 叶建军 | Large-area or large-volume concrete pre-buried blast hole arrangement method and blasting demolition method |
| CN105091682B (en) * | 2015-07-01 | 2016-11-16 | 叶建军 | The axial pre-buried big gun hole of reinforced column and demolition blasting method |
| CN105783618B (en) * | 2016-03-18 | 2018-07-13 | 中国水利水电第十一工程局有限公司 | Bank demolition blasting construction method drops in defrlector bucket |
| JP6765836B2 (en) * | 2016-03-31 | 2020-10-07 | 株式会社大林組 | Structure demolition method |
| CN110284674A (en) * | 2019-06-11 | 2019-09-27 | 湖北工业大学 | Reinforced concrete stairs embedded hole arrangement and the method for installing handrail and demolition blasting |
| CN111335672A (en) * | 2020-03-30 | 2020-06-26 | 中铁二十二局集团第五工程有限公司 | Diamond wire saw cutting construction method |
| CN112983047B (en) * | 2021-02-09 | 2022-07-15 | 江西荣达***新技术开发有限公司 | Static cutting demolition method suitable for blasting demolition |
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