CN108612109B - Bracket-free dismantling method for concrete support beam - Google Patents
Bracket-free dismantling method for concrete support beam Download PDFInfo
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- CN108612109B CN108612109B CN201810393777.7A CN201810393777A CN108612109B CN 108612109 B CN108612109 B CN 108612109B CN 201810393777 A CN201810393777 A CN 201810393777A CN 108612109 B CN108612109 B CN 108612109B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The invention provides a bracket-free dismantling method for a concrete support beam, which comprises the following steps: step a: determining a cutting scheme according to the actual field, and marking a cutting position on the concrete support beam to be cut according to the cutting scheme; step b: chiseling concrete at the upper corner of the cutting position of the support beam to expose a main rib at the upper corner of the support beam, and chiseling a through groove for penetrating a diamond chain at the lower part of the main rib; step c: the diamond chain penetrates through the groove, is wound by one circle along the bottom of the supporting beam and is connected and closed, and then the supporting beam is cut in a segmented mode through the diamond chain; step d: after the segmental cutting work of the support beam is completed, each segment of the support beam is hoisted through a crane, the main ribs connected to the upper portion of the support beam are cut off, each segment of the support beam is completely cut, and then the support beam is hoisted segment by segment.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a bracket-free dismantling method for a concrete support beam.
Background
At present, in many foundation pit projects, a reinforced concrete inner supporting beam is adopted to support a building enclosure of the foundation pit, so that the safety of the foundation pit in the excavation and construction processes is ensured. When the reinforced concrete supporting beam is cut and removed by sections such as a rope saw, a saw blade and the like, a supporting bracket is generally required to be arranged at the bottom of the supporting beam, (the bottom bracket is a steel pipe scaffold generally, or a steel structure stool and the like), the cut concrete supporting beam is supported, then a steel wire rope is bound to carry out lifting, or a forklift is used for carrying and removing the concrete supporting beam. However, due to the limited narrow working area and the limited construction period, the erection and the removal of the support bracket and other facilities are time-consuming and labor-consuming, and the operation is inconvenient.
Disclosure of Invention
In view of the above, the invention provides a bracket-free dismantling method for a concrete support beam, and aims to solve the problem that the existing concrete support beam is time-consuming and labor-consuming to dismantle.
The invention provides a bracket-free dismantling method for a concrete support beam, which comprises the following steps:
step a: determining a cutting scheme according to the actual field, and marking a cutting position on the concrete support beam to be cut according to the cutting scheme;
step b: chiseling concrete at the upper corner of the cutting position of the support beam to expose a main rib at the upper corner of the support beam, and chiseling a through groove for penetrating a diamond chain at the lower part of the main rib;
step c: the diamond chain penetrates through the groove, is wound by one circle along the bottom of the supporting beam and is connected and closed, and then the supporting beam is cut in a segmented mode through the diamond chain;
step d: after the segmental cutting work of the support beam is completed, each segment of the support beam is hoisted through a crane, the main ribs connected to the upper portion of the support beam are cut off, each segment of the support beam is completely cut, and then the support beam is hoisted segment by segment.
Furthermore, in the bracket-free dismantling method for the concrete support beam, in the step c, the cutting seams at the two sides of the support beam at the head end are inverted splayed, and the cutting seams of the subsequent support beams at the sections are vertically cut according to the vertical direction, so that the length of the cutting seams is shortened, and the cutting time is shortened.
Further, in the above-mentioned method for removing a concrete support beam without a bracket, the angle of the cutting seam is preferably controlled to be 75 ° to 85 °.
Further, in the above-mentioned method for removing a concrete support beam without a bracket, in the above-mentioned step b, in the above-mentioned step c, when the cutting depth exceeds half of the cross section of the support beam, short steel bar brazes are hammered into both sides of the cut seam on the upper portion of the support beam, and the cut seam is filled up, so as to reduce the degree of the support beam collapsing downwards.
Further, in the bracket-less removing method of a concrete support beam, in the step c, the diamond chain may not rub against the main rib chiseled out when the support beam is cut in sections, so as to avoid breaking the tensile force of the main rib.
Further, in the bracket-less removing method for a concrete support beam, in the step b, when the weight of the support beam is large and the main reinforcement is chiseled out to be insufficient to bear the weight of the support beam, the number of chiseled out main reinforcements is increased or the length of the support beam section is reduced, so that the main reinforcement can be ensured to pull the support beam after the concrete of the support beam is cut off.
Further, in the bracket-less removing method for a concrete backbar, in the step b, the size of the groove is determined by the diameter of the diamond chain.
Further, in the bracket-less removing method of a concrete support beam, in the step b, the groove is required to be completely cut before the support beam is cut.
Further, in the above-mentioned method for removing a concrete supporting beam without a bracket, after the cutting plan is determined in the step a, a corresponding hoisting plan is determined.
Further, in the above method for removing a concrete support beam without a bracket, the cutting sequence of the support beam is determined by the hoisting sequence of the hoisting scheme.
Compared with the prior art, the method for dismantling the concrete support beam without the bracket has the advantages that the support bracket for supporting the support beam does not need to be erected and dismantled in the process of dismantling the concrete support beam, so that the construction procedures are greatly reduced, the construction cost is reduced, and the construction period is saved.
Particularly, according to the bracket-free dismantling method for the concrete support beam, the diamond chain is used for cutting the concrete support beam, so that on one hand, the cutting rate of the support beam is effectively increased, and the construction progress of the support beam in the dismantling process is ensured; on the other hand, the influence of the support beam on the environment in the dismantling process is greatly reduced, and green construction is achieved.
Furthermore, according to the bracket-free dismantling method for the concrete support beam, the cutting length is reduced to the maximum extent by setting the angle for limiting the cutting seam in the process of dismantling the support beam, so that the cutting time is saved, and the construction progress is accelerated to a certain extent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a method for bracket-less removal of a concrete support beam according to an embodiment of the present invention;
FIG. 2 is a drawing showing the layout of the cut-outs in the support beam in a method for the bracket-less removal of a concrete support beam according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a state of a short steel bar brazing filler metal in a cutting gap in the bracket-less removing method for a concrete support beam according to an embodiment of the present invention.
In the figure: 1 is a concrete supporting beam, 2 is a main rib, 3 is a groove, 4 is a cutting seam, and 5 is a short reinforcing bar drill rod.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 3, a method for bracket-less removal of a concrete support beam according to an embodiment of the present invention includes the steps of:
step a: determining a cutting scheme according to the actual field, and marking a cutting position on the concrete support beam to be cut according to the cutting scheme;
specifically, the design of a cutting scheme and a hoisting scheme is carried out according to the actual situation of a construction site, the cutting scheme comprises the cutting segmentation position of the concrete supporting beam 1, the type selection and the station position of a crane, the selection of a steel wire rope hanger, the type selection and the station position of a trailer, the cutting sequence and the like, and the specific cutting position is marked by red paint and the like on the concrete supporting beam 1 needing to be cut according to the design requirement.
Step b: chiseling concrete at the upper corner of the cutting position of the support beam to expose a main rib at the upper corner of the support beam, and chiseling a through groove for penetrating a diamond chain at the lower part of the main rib;
specifically, after cutting positions are marked on the concrete supporting beam 1, concrete at two corners of the upper part of the concrete supporting beam 1 at all marked positions is chiseled one by one to expose the main ribs 2 in the concrete supporting beam, and a through groove 3 is chiseled at the lower part of the corresponding main rib 2, wherein the size of the groove 3 is based on the fact that a diamond chain can smoothly pass through the groove 3, so that the fact that the diamond chain can smoothly pass through the groove 3 in the subsequent cutting process is guaranteed, and the concrete supporting beam 1 is cut. It should be noted that, if the weight of the concrete support beam 1 is found to be large and the chiseled main reinforcement 2 is not enough to bear the weight of the concrete support beam, the length of the concrete support beam 1 section can be reduced or the number of chiseled main reinforcements can be increased to ensure that the connected main reinforcement 2 can pull the section of the concrete support beam 1 after the concrete of the concrete support beam 1 is cut off.
Step c: the diamond chain penetrates through the groove, is wound by one circle along the bottom of the supporting beam and is connected and closed, and then the supporting beam is cut in a segmented mode through the diamond chain;
specifically, after the groove 3 is chiseled, the diamond chain is wound for a circle along the bottom of the concrete support beam from the groove 3, the diamond chain is connected and sealed, the diamond chain can be just wrapped on the concrete support beam 1, then the concrete support beam 1 is cut, in the cutting process, the cutting seams 4 on two sides of the first section of the concrete support beam 1 are inverted splayed according to the hoisting sequence, the cutting seams 4 of the subsequent sections are cut vertically as much as possible, the angle of the cutting seam 4 is preferably controlled to be 75-85 degrees, the length of the cutting seam is reduced as much as possible, and the cutting time is shortened. Meanwhile, when the cutting depth of the concrete support beam 1 exceeds a half of the cross section of the beam, two short steel bar drill rods 5 are hammered into two sides of the upper cutting seam by using an iron hammer, and the cutting seam 4 is filled up, so that the degree of downward collapse and falling of the cut segmented beam is reduced. In addition, when carrying out the cutting of concrete supporting beam 1, the diamond chain can not rub out main muscle 2 of chiseling to avoid destroying the pulling force of main muscle 2 in the cutting process, and then cause the incident. It should be noted that the cutting sequence of the concrete support beam 1 is performed in the sequence of hanging and cutting first in the process of cutting the concrete support beam in sections.
Step d: after the segmental cutting work of the support beam is completed, each segment of the support beam is hoisted through a crane, the main ribs connected to the upper portion of the support beam are cut off, each segment of the support beam is completely cut, and then the support beam is hoisted segment by segment.
Specifically, after the cutting work of each section of the concrete support beam 1 is completed, the steel wire ropes are hung through a crane to bind the concrete support beams in the subsection, the steel wire ropes are tightened to hang the concrete support beams so as to ensure that each section of the support beams cannot fall off in the process of cutting off the main ribs 2 of the concrete support beams, then the main ribs 2 connected to the upper portion of the concrete support beams 1 are sequentially cut off one by one, each section of the concrete support beams are thoroughly cut off, and finally the concrete support beams are hoisted section by section through the crane to be removed. It can be understood that the main reinforcement 2 of the concrete supporting beam 1 is cut section by section, and the corresponding concrete supporting beam section is transferred and transported section by section, so that the personnel safety in the construction process is effectively ensured, and the construction safety is ensured.
Obviously, the bracket-free dismantling method for the concrete support beam provided by the invention has the advantages that in the dismantling process of the concrete support beam, a support bracket for supporting the support beam is not required to be erected and dismantled, so that the construction procedures are greatly reduced, the construction cost is reduced, and the construction period is saved; meanwhile, the dismantling rate of the concrete support is ensured, and the construction progress is improved; moreover, the influence on the environment is reduced, and the green construction is really realized.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A bracket-free dismantling method for a concrete support beam is characterized by comprising the following steps:
step a: determining a cutting scheme according to the actual field, and marking a cutting position on the concrete support beam to be cut according to the cutting scheme;
step b: chiseling concrete at the upper corner of the cutting position of the support beam to expose a main rib at the upper corner of the support beam, wherein the main rib is close to the upper part of the support beam, and a groove for penetrating a diamond chain is chiseled at the lower part of the main rib;
step c: the diamond chain penetrates through the groove, is wound by a circle along the bottom of the supporting beam, is connected and sealed, and then is subjected to segmented cutting of the supporting beam through the diamond chain according to the hanging and cutting sequence, wherein the cutting seams on two sides of the supporting beam in the first section are 75-85 degrees, the cutting seams on two sides are inverted splayed, and the cutting seams of the supporting beam in each subsequent section are vertically cut; when the cutting depth exceeds a half of the section of the support beam, short steel bar drills are hammered into two sides of a cutting seam on the upper part of the support beam to fill the cutting seam, so that the degree of the support beam which is cut down and collapses is reduced;
step d: after the subsection cutting work of the support beam is finished, hoisting each section of the support beam through a crane, cutting off the main ribs connected to the upper part of the support beam, completely cutting off each section of the support beam, and then hoisting section by section, wherein the cutting sequence of the subsection cutting of the concrete support beam is carried out according to the sequence of hoisting and cutting firstly.
2. The method for bracket-free removal of a concrete supporting beam according to claim 1, wherein in the step c, the diamond chain is not rubbed against the main bar chiseled out to avoid breaking the tension of the main bar when the segmental cutting of the supporting beam is performed.
3. The method of claim 1, wherein in step b, the size of the groove is determined by the diameter of the diamond chain.
4. The method of claim 1, wherein in step b, the grooves are completely cut before the beam is cut.
5. A method for bracket-less removal of a concrete supporting beam according to claim 1, wherein in step a, after the cutting plan is determined, a corresponding lifting plan is determined.
6. The method of claim 5, wherein the cutting sequence of the support beam is determined by the lifting sequence of the lifting plan.
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| CN109267764A (en) * | 2018-11-05 | 2019-01-25 | 中建设集团有限公司 | Engineering method is cut and disassembled in reinforced concrete support mechanization |
| CN109723233A (en) * | 2018-12-28 | 2019-05-07 | 中国二十冶集团有限公司 | Buddha's warrior attendant chain fly-cutting concrete construction method |
| CN110056205A (en) * | 2019-04-25 | 2019-07-26 | 中建四局第四建筑工程有限公司 | A method of using rope saw cut concrete inner support beam |
| CN112343064A (en) * | 2020-11-27 | 2021-02-09 | 中铁七局集团第五工程有限公司 | Construction method for dismantling large-section annular concrete support beam of deep foundation pit |
| CN113478013B (en) * | 2021-07-06 | 2022-06-14 | 广东中人岩土工程有限公司 | Supporting beam cutting and breaking device |
| CN114658006A (en) * | 2022-04-20 | 2022-06-24 | 中建三局集团有限公司 | Inner supporting member applicable to foundation pit concrete and method for rapidly removing inner supporting member |
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| CN101705687B (en) * | 2009-10-23 | 2011-07-13 | 广东省基础工程公司 | Deep foundation pit reinforced concrete waist rail detaching device and construction method |
| 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 |
| CN106894421A (en) * | 2017-01-19 | 2017-06-27 | 中国建筑第八工程局有限公司 | The method for dismounting of internal support of foundation pit beam |
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| 切割拆除深基坑工程钢筋混凝土内支撑结构施工技术;张自安等;《价值工程》;20180322;第142-144页 * |
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