CN111255238A - Construction method for supporting steel box girder of super-large-span escalator - Google Patents
Construction method for supporting steel box girder of super-large-span escalator Download PDFInfo
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- CN111255238A CN111255238A CN202010181736.9A CN202010181736A CN111255238A CN 111255238 A CN111255238 A CN 111255238A CN 202010181736 A CN202010181736 A CN 202010181736A CN 111255238 A CN111255238 A CN 111255238A
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B23/00—Component parts of escalators or moving walkways
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- Escalators And Moving Walkways (AREA)
- Ladders (AREA)
Abstract
The invention discloses a construction method for supporting a steel box beam of an ultra-large span escalator, which comprises construction BIM deepening, construction scheme determination, component splitting processing, construction preparation, component approach, "thin waist" installation, and mounting and acceptance of a box beam support of the escalator. The invention has the beneficial effects that: the BIM technology is used for carrying out three-dimensional simulation installation on installation construction, the quality control difficulty is found out, the construction quality of the node is ensured, the node is hoisted in sections by using a crane, a high and large operating frame is avoided being erected, the use and the labor consumption of turnover materials are greatly reduced, the construction cost is saved, the construction operation is concentrated, the potential safety hazard points are few, the centralized management of a site is facilitated, the mechanical subsection processing of a factory is realized, the site welding amount is reduced, the generation of waste materials, light pollution and the like is avoided, the BIM technology is used for simulating installation, the technical and quality problems are prevented in advance, and the generation of site problems is reduced.
Description
Technical Field
The invention relates to a support construction method, in particular to a construction method for supporting a steel box girder of an ultra-large span escalator, and belongs to the technical field of buildings.
Background
In order to achieve a better space effect, a middle court is generally arranged in a business body, an escalator is arranged in the middle court, so that the view is widened and people stream is evacuated, the conventional method of most commercial synthesis bodies is adopted, markets with large-span and ultrahigh escalators arranged in the middle court are rare, the large-span escalator is used, the space under the escalator can be occupied as little as possible, the novel escalator structure and the difference of visual perception of people are strived for, in order to achieve the effect, a steel beam box with two end supports supporting the structure is adopted in the middle court of the commercial synthesis body to serve as a supporting system of the escalator and a framework of the escalator, and the operation of a flying ladder is supported.
Although the existing construction method for supporting the steel box girder of the ultra-large span escalator is widely used, the existing construction method for supporting the steel box girder of the ultra-large span escalator still has some problems, one of the existing construction methods for supporting the steel box girder of the ultra-large span escalator is high in manufacturing cost and low in safety factor, and the other construction method for supporting the steel box girder of the ultra-large span escalator is inconvenient to control in construction quality and long in construction period.
Disclosure of Invention
The invention aims to solve the problems and provide a construction method for supporting a steel box beam of an ultra-large span escalator.
The invention realizes the purpose through the following technical scheme: a construction method for supporting a steel box girder of an ultra-large span escalator comprises the following steps:
step A: building BIM deepening, strictly rechecking the position and the size of a base of a pre-buried steel structure and the elevation of a foundation pit of the escalator in the field structure, establishing a BIM model of the flying ladder according to the positioning of a support frame of the flying ladder, the elevation of the support frame of the flying ladder and the size of the field structure, and assembling and analyzing the components of the flying ladder through the BIM model;
and B: determining a construction scheme, namely, according to a drawn BIM model of the flying ladder support system, adopting an overall construction scheme that components are processed outside a field, assembled in groups inside the field, and installed and fixed in groups by using a crane;
and C: the method comprises the steps of splitting and processing components, processing the components outside the site according to the decomposed components, classifying all numbered components in a processing plant into small sections and transporting the small sections to a construction site in consideration of site problems, and grouping the materials into different places strictly according to the construction progress and the assembled components to ensure that the truss is assembled smoothly in order to avoid secondary transportation due to various types;
step D: construction preparation, namely verifying equipment and site size;
step E: the components enter the field, each component is entered in batches according to the field construction progress and the field size, and the components are rechecked and inspected before entering the field;
step F: the method comprises the steps of installing the support frame in a thin waist mode, wherein a support system is divided into support columns, a support platform and a top flower frame, steel columns of the support frame are layered and divided into components, the lower layer is firstly arranged, the upper layer is arranged, the support platform is integrally assembled, hoisted and fixed after the support columns are installed and checked, and finally the flower frame is integrally hoisted;
step G: the escalator box beam supports are installed, the flying ladder support steel structure is two parallel sections of box beams, each box beam enters the field in five sections, and each flying ladder support frame is integrally hoisted and installed by upper and lower sections;
step H: and (5) checking and accepting, and detecting the steel beam support after the installation is finished.
As a still further scheme of the invention: in the step B, the flying ladder is decomposed according to small components through a BIM model: segmenting the overlong and overweight components according to the following principle according to comprehensive factors such as a field, crane arrangement, an installation process, transportation conditions of a manufacturing plant and the like, wherein the weight of all the components is within the hoisting weight range of a crane; the maximum turning radius of the maximum crane of the outdoor sinking square is 13m, and the length of the member is not more than 13 m; the segmentation avoids stress concentration.
As a still further scheme of the invention: in the step E, whether the ex-factory qualification certificate and various marks of the rod piece are complete or not is detected, and particularly, the node parts of all components need to be marked up, down, left and right at the pipe orifice when the components are out of the factory; before leaving the factory, the geometric dimensions of each rod piece, such as length, the pipe wall thickness and diameter of the circular pipe, straightness and the like, are strictly checked; checking whether the size and angle of the connection port of each component are correct.
As a still further scheme of the invention: and in the step F, firstly, installing a 'thin waist' flower stand supporting system of the flying ladder steel structure, using a 500T crane to transport three 25T cranes to an underground second-floor indoor sinking square in advance, using one 500T crane and 3 25T cranes to install the flying ladder supporting steel structure, and because the self weight of the 25T cranes and the load in the later-stage transportation process are large, the 25T cranes need to be padded with steel plates with the thickness of 25mm and the thickness of 3m and 2m at supporting legs in the using process.
As a still further scheme of the invention: and F, dividing the steel column support into four layers, assembling and installing the steel column support columns on site four times, installing the steel column in sections, installing the steel beam and the inclined strut after the steel column is installed, hoisting the steel column, expanding the steel column to the periphery in the middle, and timely forming a standard rigid frame by the components hoisted every day and expanding the steel column outwards according to the axis.
As a still further scheme of the invention: and G, welding positions of the flying ladder supporting box girders are arranged outside the midspan 1/3, and the box girder supports at the upper end and the lower end are installed with the box girders at the same time.
The invention has the beneficial effects that: the construction method for supporting the steel box girder of the ultra-large span escalator is reasonable in design:
1. the construction period is shortened, the escalator supporting structure is large in span and high in height, the steel box girder is reasonably processed in a segmented factory, the transportation is convenient, the installation is rapid, and the construction period is saved;
2. the construction quality control is convenient, the BIM technology is used for carrying out three-dimensional simulation installation on the installation construction, the quality control difficulty is found out, and the construction quality of the node is ensured;
3. the cost is saved, the crane is used for hoisting in sections, a high and large operation frame is avoided being erected, the use and the labor consumption of the turnover materials are greatly reduced, and the construction cost is saved;
4. the safety factor is high, the construction operation is concentrated, potential safety hazard points are few, and the centralized management on site is convenient;
5. green construction, factory mechanization segmentation processing reduces on-the-spot welding volume, avoids producing waste material, light pollution etc. uses BIM technique simulation installation, makes the prevention in advance with technical, quality problem, reduces the production of on-the-spot problem.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a construction method for supporting a steel box girder of a super-large span escalator includes the following steps:
step A: building BIM deepening, strictly rechecking the position and the size of a base of a pre-buried steel structure and the elevation of a foundation pit of the escalator in the field structure, establishing a BIM model of the flying ladder according to the positioning of a support frame of the flying ladder, the elevation of the support frame of the flying ladder and the size of the field structure, and assembling and analyzing the components of the flying ladder through the BIM model;
and B: determining a construction scheme, namely, according to a drawn BIM model of the flying ladder support system, adopting an overall construction scheme that components are processed outside a field, assembled in groups inside the field, and installed and fixed in groups by using a crane;
and C: the method comprises the steps of splitting and processing components, processing the components outside the site according to the decomposed components, classifying all numbered components in a processing plant into small sections and transporting the small sections to a construction site in consideration of site problems, and grouping the materials into different places strictly according to the construction progress and the assembled components to ensure that the truss is assembled smoothly in order to avoid secondary transportation due to various types;
step D: construction preparation, namely verifying equipment and site size;
step E: the components enter the field, each component is entered in batches according to the field construction progress and the field size, and the components are rechecked and inspected before entering the field;
step F: the method comprises the steps of installing the support frame in a thin waist mode, wherein a support system is divided into support columns, a support platform and a top flower frame, steel columns of the support frame are layered and divided into components, the lower layer is firstly arranged, the upper layer is arranged, the support platform is integrally assembled, hoisted and fixed after the support columns are installed and checked, and finally the flower frame is integrally hoisted;
step G: the escalator box beam supports are installed, the flying ladder support steel structure is two parallel sections of box beams, each box beam enters the field in five sections, and each flying ladder support frame is integrally hoisted and installed by upper and lower sections;
step H: and (5) checking and accepting, and detecting the steel beam support after the installation is finished.
Further, in the embodiment of the present invention, in the step B, the flying ladder is decomposed according to small components through a BIM model: segmenting the overlong and overweight components according to the following principle according to comprehensive factors such as a field, crane arrangement, an installation process, transportation conditions of a manufacturing plant and the like, wherein the weight of all the components is within the hoisting weight range of a crane; the maximum turning radius of the maximum crane of the outdoor sinking square is 13m, and the length of the member is not more than 13 m; stress concentration is avoided in sections, so that tissue digestion is more thorough, safety is greatly ensured, component transportation and hoisting are facilitated, and construction is facilitated.
Further, in the embodiment of the present invention, in the step E, it is detected whether the delivery certification and various marks of the rod are complete, and especially, the node parts of each component are marked up, down, left, and right at the pipe orifice when the component is delivered from the factory; before leaving the factory, the geometric dimensions of each rod piece, such as length, the pipe wall thickness and diameter of the circular pipe, straightness and the like, are strictly checked; whether the sizes and the angles of the connecting ports of the components are correct or not is checked, the recovery rate of the adipose-derived stem cells is high, the separation speed is higher than that of the traditional separation speed, and the efficiency and the accuracy of field assembling personnel can be greatly improved.
Furthermore, in the embodiment of the invention, in the step F, firstly, the 'thin waist' pergola support system of the flying ladder steel structure is installed, three 25T cranes are transported to the underground second-storey indoor sinking square by using 500T cranes in advance, and one 500T crane and 3 25T cranes are used for installing the supporting steel structure of the flying ladder, because the self weight of the 25T crane and the load in the later-stage transportation process are large, and the 25T crane needs to be padded with a steel plate with the thickness of 25mm and the thickness of 3m and 2m at the supporting legs in the use process, the installation can be guaranteed with high quality and efficiency, the safety of the top plate of the lower-storey structure is ensured, and the uniform force transmission of the structure is ensured.
Further, in the embodiment of the present invention, in the step F, the steel column supports are divided into four layers, the steel column support columns are assembled and installed on site four times, the steel columns are installed in sections, the steel columns are installed after the steel columns are installed, the steel beams and the inclined struts are installed, the hoisting is performed first in the middle and then is expanded all around, the components hoisted each day form a standard rigid frame in time, the components are expanded outwards according to the axis, the installation firmness is ensured, the assembly is ensured to be more orderly, the installation time is saved, and the subculture speed is further increased.
Furthermore, in the embodiment of the invention, in the step G, the welding position of the flying ladder supporting box girder is outside the midspan 1/3, and the box girder supports at the upper end and the lower end are installed with the box girder at the same time, so that the situation that the structure safety is affected due to large stress deformation at the construction weld position in the hoisting and later use processes is avoided.
The working principle is as follows: according to the characteristics of large span, super height and various structural member styles of the structure, the construction scheme of 'processing of off-site members, assembling of segments in the site and welding of segments' is determined; according to a design construction drawing, adopting a BIM technology to simulate an installation process, and determining the division of the number of sections of the support system of the flying ladder and the sequence of hoisting construction; the construction sequence of the components and the standing position of the crane are reasonably arranged, the installation of the upper end support of the flying ladder is completed in a thin waist mode, and the box girder is convenient to hoist and install in place at one time; the box girder adopts the construction sequence of firstly hoisting the upper half part, firmly fixing and then hoisting the lower half part, and the double ladders are constructed simultaneously.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A construction method for supporting a steel box girder of an ultra-large span escalator is characterized by comprising the following steps: the method comprises the following steps:
step A: building BIM deepening, strictly rechecking the position and the size of a base of a pre-buried steel structure and the elevation of a foundation pit of the escalator in the field structure, establishing a BIM model of the flying ladder according to the positioning of a support frame of the flying ladder, the elevation of the support frame of the flying ladder and the size of the field structure, and assembling and analyzing the components of the flying ladder through the BIM model;
and B: determining a construction scheme, namely, according to a drawn BIM model of the flying ladder support system, adopting an overall construction scheme that components are processed outside a field, assembled in groups inside the field, and installed and fixed in groups by using a crane;
and C: the method comprises the steps of splitting and processing components, processing the components outside the site according to the decomposed components, classifying all numbered components in a processing plant into small sections and transporting the small sections to a construction site in consideration of site problems, and grouping the materials into different places strictly according to the construction progress and the assembled components to ensure that the truss is assembled smoothly in order to avoid secondary transportation due to various types;
step D: construction preparation, namely verifying equipment and site size;
step E: the components enter the field, each component is entered in batches according to the field construction progress and the field size, and the components are rechecked and inspected before entering the field;
step F: the method comprises the steps of installing the support frame in a thin waist mode, wherein a support system is divided into support columns, a support platform and a top flower frame, steel columns of the support frame are layered and divided into components, the lower layer is firstly arranged, the upper layer is arranged, the support platform is integrally assembled, hoisted and fixed after the support columns are installed and checked, and finally the flower frame is integrally hoisted;
step G: the escalator box beam supports are installed, the flying ladder support steel structure is two parallel sections of box beams, each box beam enters the field in five sections, and each flying ladder support frame is integrally hoisted and installed by upper and lower sections;
step H: and (5) checking and accepting, and detecting the steel beam support after the installation is finished.
2. The super-span escalator steel box girder supporting construction method according to claim 1, characterized in that: in the step B, the flying ladder is decomposed according to small components through a BIM model: segmenting the overlong and overweight components according to the following principle according to comprehensive factors such as a field, crane arrangement, an installation process, transportation conditions of a manufacturing plant and the like, wherein the weight of all the components is within the hoisting weight range of a crane; the maximum turning radius of the maximum crane of the outdoor sinking square is 13m, and the length of the member is not more than 13 m; the segmentation avoids stress concentration.
3. The super-span escalator steel box girder supporting construction method according to claim 1, characterized in that: in the step E, whether the ex-factory qualification certificate and various marks of the rod piece are complete or not is detected, and particularly, the node parts of all components need to be marked up, down, left and right at the pipe orifice when the components are out of the factory; before leaving the factory, the geometric dimensions of each rod piece, such as length, the pipe wall thickness and diameter of the circular pipe, straightness and the like, are strictly checked; checking whether the size and angle of the connection port of each component are correct.
4. The super-span escalator steel box girder supporting construction method according to claim 1, characterized in that: and in the step F, firstly, installing a 'thin waist' flower stand supporting system of the flying ladder steel structure, using a 500T crane to transport three 25T cranes to an underground second-floor indoor sinking square in advance, using one 500T crane and 3 25T cranes to install the flying ladder supporting steel structure, and because the self weight of the 25T cranes and the load in the later-stage transportation process are large, the 25T cranes need to be padded with steel plates with the thickness of 25mm and the thickness of 3m and 2m at supporting legs in the using process.
5. The super-span escalator steel box girder supporting construction method according to claim 1, characterized in that: and F, dividing the steel column support into four layers, assembling and installing the steel column support columns on site four times, installing the steel column in sections, installing the steel beam and the inclined strut after the steel column is installed, hoisting the steel column, expanding the steel column to the periphery in the middle, and timely forming a standard rigid frame by the components hoisted every day and expanding the steel column outwards according to the axis.
6. The super-span escalator steel box girder supporting construction method according to claim 1, characterized in that: and G, welding positions of the flying ladder supporting box girders are arranged outside the midspan 1/3, and the box girder supports at the upper end and the lower end are installed with the box girders at the same time.
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2020
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| CN101691184A (en) * | 2009-09-01 | 2010-04-07 | 日立电梯（中国）有限公司 | Support system of escalator |
| CN106904520A (en) * | 2017-03-09 | 2017-06-30 | 中衡设计集团股份有限公司 | A kind of large span staircase and girder structure |
| CN106869308A (en) * | 2017-03-13 | 2017-06-20 | 同济大学 | A kind of quick turnover method of assembled architecture support system based on BIM |
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