CN112276391B - Installation method of spiral steel stairs in limited space - Google Patents
Installation method of spiral steel stairs in limited space Download PDFInfo
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- CN112276391B CN112276391B CN202011115767.0A CN202011115767A CN112276391B CN 112276391 B CN112276391 B CN 112276391B CN 202011115767 A CN202011115767 A CN 202011115767A CN 112276391 B CN112276391 B CN 112276391B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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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
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/18—Adjusting tools; Templates
- E04G21/1841—Means for positioning building parts or elements
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Abstract
The invention provides a method for installing a spiral steel stair in a limited space, wherein a steel member is subjected to shrinkage reservation at a deep design stage, a smaller welding seam size is adopted, the position of the welding seam is reasonably arranged, the welding seam is symmetrical to a section neutral axis or is closer to the neutral axis, a portal frame is used as a movable jig frame during welding, the steel member is hoisted by matching with a hoist, the horizontal positions of the four corresponding corners projected at the bottom of the steel member are put on the ground and marked to obtain corresponding points, self-made vertical telescopic stainless steel vertical rods are used, the vertical rods are aligned to the points, the verticality is adjusted, the elevation is measured by using a level gauge and a tower ruler, the top ends of the telescopic vertical rods are adjusted to be consistent with the measured elevation, the steel member is subjected to spatial three-dimensional positioning, the portal frame is adjusted to fix the steel member, the welding part is preheated and then is subjected to symmetrical welding, and the problem that the steel member existing in the installation process of the spiral steel stair in the limited space is easy to deform after welding is solved, the large-scale machine can not be used, and the quality is difficult to ensure.
Description
Technical Field
The invention relates to the technical field of steel structure engineering construction, in particular to a method for installing a spiral steel stair in a limited space.
Background
Stairs are one of the most functional elements in modern buildings, and are the most common and closest building components in contact with people in the buildings. Along with the improvement of people's standard of living, also higher and higher to residential architecture and indoor decoration and fitment requirement, satisfy under service function's the prerequisite, people begin to pursue the artistic modeling that is rich in the mobility more, the space that spiral stair occupy is little, very big usage space has been saved, and the great reinforced concrete stair of the stair dead weight of steel construction are light many, more slim and graceful and easily install and reform transform in the molding, receive people's attention more and more, indoor restricted space spiral steel stair installation, because the steel member is heterotypic helical structure, the three-dimensional space location degree of difficulty is big, the steel member welding is yielding, large-scale machine can't use, the quality is difficult to guarantee.
Disclosure of Invention
The embodiment of the invention provides a method for installing a spiral steel stair in a limited space, which comprises the steps of reserving shrinkage when designing a steel member in a deepening design stage of the steel member, adopting a smaller welding seam size, reducing unnecessary welding seams, adopting groove welding, reducing fillet welding, reasonably arranging the position of the welding seams, enabling the welding seams to be symmetrical to a section neutral axis or be closer to the section neutral axis, using a portal frame as a movable jig frame during welding, hoisting the steel member by matching with a hoist, putting the horizontal positions of four corresponding corner projections at the bottom of the steel member on the ground and marking to obtain corresponding point positions, using a self-made vertical telescopic stainless steel upright rod, aligning the point positions of the upright rods, adjusting the verticality, measuring the elevation by using a level gauge and a tower ruler, adjusting the top end of the telescopic upright rod to be consistent with the measurement height, carrying out space three-dimensional positioning on the steel member, adjusting the portal frame to fix the steel member, the symmetric welding is carried out after the welding part is preheated, and the problems that steel members existing in the installation process of the spiral steel stair in the limited space are easy to deform after being welded, large machinery cannot be used, and the quality is difficult to guarantee are solved.
In view of the above problems, the technical solution proposed by the present invention is:
the installation method of the spiral steel stairs in the limited space comprises the following steps:
s1, designing a steel member, reserving shrinkage of a steel structure deepening drawing in the process of designing the steel member, reducing welding seams, adopting groove welding and reducing fillet welding, wherein the welding seams are symmetrical to a neutral axis of a section or close to the neutral axis;
s2, carrying out steel member plane paying-off positioning, paying-off positioning the plane positions of the four corners corresponding to the bottom of each steel member according to a deepening drawing, and marking the point positions of the four corners corresponding to the bottom of each steel member on the position right below a floor slab;
s3, fixing a first steel member at a support, directly paying off and positioning one end of the first steel member at the support on an anchor bolt, fixing the first steel member by spot welding, and supporting the other end of the first steel member by using a supporting column;
the bottom of the supporting column is provided with a supporting plate for enhancing the stability of the supporting column;
s4, positioning the other end of the first steel member, aligning the root of the telescopic vertical rod to the point position of the steel member on a horizontal floor, adjusting the vertical rod to be vertical according to a level gauge, placing a tower ruler close to the vertical rod, using the level gauge to dip the elevation of the point position of the steel member, adjusting the height of the telescopic stainless steel vertical rod to enable the top of the telescopic stainless steel vertical rod to be flush with the elevation, and determining the center of the top of the telescopic vertical rod as the spatial position of the point position of the steel member;
the telescopic vertical rod comprises a telescopic rod, a fixed support and a level meter, wherein the telescopic rod is installed at the top of the fixed support, the level meter is installed on one side of the telescopic rod, and the level meter is used for detecting the verticality of the telescopic vertical rod;
s5, rigidly fixing a steel member, erecting a portal frame at the other end of the steel member, adjusting the position of the steel member by using a hoist to enable a target point to fall on the center of the top of the telescopic vertical rod, keeping the steel member stationary, placing a support column under the steel member and adjusting the height, temporarily fixing the steel member by spot welding, and adjusting the portal frame to fix the position of the steel member;
the portal frame comprises a cross beam, an inclined strut support, a support frame, a fixed pipe and a U-shaped top support, wherein the support frame is installed on two sides of the bottom of the cross beam, the inclined strut support is installed between the cross beam and the support frame, the fixed pipe is installed on one side of the support frame, the outer wall of one end of the U-shaped top support is in threaded connection with the inner wall of the fixed pipe, and the U-shaped top support is used for contacting with a steel member to fix the position of the steel member;
s6, preheating the steel member, namely preheating by using an electric heater and measuring the temperature at any time by using a temperature detector, wherein the preheating area is arranged on two sides of the welding groove, the preheating width is more than 1.5 times of the thickness of the welding part and is not less than 100mm, and the preheating temperature is measured on the reverse side of the welded member;
s7, symmetrically welding by two welders at the same time, welding the backing weld of the whole structure node, then welding the filling weld of the whole structure node, and finally welding the cover surface of the welded node, wherein the backing weld is used for freely releasing the stress of each layer;
s8, positioning a second steel member, erecting portal frames at two ends of the second steel member respectively, adjusting the second steel member by a hoist, aligning roots of two telescopic vertical rods with points of the steel member projected on a floor at two ends of the second steel member, adjusting the vertical rods to be vertical according to a level, placing a tower staff close to the vertical rods, using the level to read the elevation between the two ends and the points of the second steel member, adjusting the two telescopic stainless steel vertical rods respectively to enable the tops of the two telescopic stainless steel vertical rods to be flush with the elevations corresponding to the two ends of the second steel member respectively, adjusting the positions of the two ends of the steel member by the hoist to enable target points to fall in the center of the tops of the telescopic vertical rods, keeping the steel member stationary, placing support columns under the steel member and adjusting the height, spot-welding the temporarily fixed steel member, adjusting the portal frames to squeeze the steel member tightly, and fixing the position of the steel member;
s9, preheating a second steel member, performing preheating treatment by adopting an electric heater and measuring the temperature at any time by using a temperature detector, wherein the preheating area is arranged on two sides of the welding groove, the preheating width is more than 1.5 times of the thickness of a welding part and is not less than 100mm, and the preheating temperature is measured on the reverse side of the welding part;
s10, welding a second steel member, symmetrically welding two welders at the same time, welding the whole structural joint by backing welding, then welding the whole structural joint by filling welding, and finally welding the cover surface of the welded joint, wherein the backing welding is used for freely releasing the stress of each layer;
and S11, repeating S8-S10, and completely installing the rest steel structures.
In order to better realize the technical scheme of the invention, the following technical measures are also adopted.
Further, fixed pipe with the quantity of U type top support is four, with two fixed pipe with U type top support is a set of, and is two sets of fixed pipe with U type top support symmetry set up in the inboard of support frame, U type top support be used for through with fixed pipe is mutually supported fixedly the position of steel member.
Further, in the steps S7 and S10, one-layer backing welding is performed, high-current welding is performed to penetrate the root of the weld, slag, spatter, and flash of the weld are removed completely after the one-layer weld is welded, the quality of the weld is checked, a second-layer weld is welded after no defect exists, the retention time of the welding arc at a certain point is strictly controlled, the staggered distance between the welding joints between the two layers is 2-3 mm, and the welding joints between the two layers cannot be overlapped.
Compared with the prior art, the invention has the beneficial effects that:
the steel member is deeply designed, the shrinkage is reserved when the steel member is designed, the size of a welding seam is smaller, unnecessary welding seams are reduced, groove welding is adopted, fillet welding is reduced, the position of the welding seam is reasonably arranged, the welding seam is symmetrical to a neutral axis of the section or is closer to the neutral axis, a portal frame is used as a movable jig frame during welding, a hoist is matched to hoist the steel member, the horizontal positions of four corresponding corners projected at the bottom of the steel member are put on the ground and marked to obtain corresponding point positions, a self-made vertical telescopic stainless steel upright rod is used, the upright rod is aligned to the point positions, the verticality is adjusted, the elevation is measured by using a level gauge and a tower ruler, the top end of the telescopic upright rod is adjusted to be consistent with the measured elevation, the steel member is spatially three-dimensionally positioned, the portal frame is adjusted to fix the steel member, the welding position is symmetrically welded after being preheated, and the problem that the steel member is easy to deform after being welded in the current spiral steel installation process in a limited space is solved, the large-scale machine can not be used, and the quality is difficult to ensure.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic view of a connection structure of a portal frame, support columns and steel members disclosed by the embodiment of the invention;
fig. 2 is a schematic structural view of the telescopic vertical rod disclosed by the embodiment of the invention;
FIG. 3 is a schematic elevation measurement diagram of a steel structure according to an embodiment of the disclosure;
FIG. 4 is a schematic structural diagram of a steel member after installation according to an embodiment of the invention;
fig. 5 is a schematic flow chart of a method for installing a spiral steel stair in a limited space, which is disclosed by the embodiment of the invention.
Reference numerals:
100-a portal frame; 101-a beam; 102-a sprag bracket; 103-a support frame; 104-a stationary tube; a 105-U-shaped jacking device; 200-support column; 201-a support plate; 300-a telescopic vertical rod; 301-a telescopic rod; 302-a fixed support; 303-a level; 400-a box staff; 500-a level gauge; 600-hoisting a hoist; 700-steel member.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
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.
Referring to the attached fig. 1-5, the installation method of the spiral steel stairs with limited space comprises the following steps:
s1, designing a steel member, reserving shrinkage of a steel structure deepening drawing in the process of designing the steel member 700, reducing welding seams, adopting groove welding and reducing fillet welding, wherein the welding seams are symmetrical to a neutral axis of a section or close to the neutral axis;
specifically, in the drawing deepening design stage of the steel member, the shrinkage is reserved, the size of a small welding seam is adopted as much as possible, the position of the welding seam is reasonably arranged, and the welding seam is symmetrical to a section neutral axis or is closer to the neutral axis as much as possible.
S2, carrying out steel member plane paying-off positioning, paying-off positioning the plane positions of the four corners corresponding to the bottom of each steel member according to a deepening drawing, and marking the point positions of the four corners corresponding to the bottom of each steel member on the position right below a floor slab;
specifically, according to the position of the steel member in the deepening drawing, the position of four corners corresponding to the bottom of each steel member is marked by paying off on the floor, the position of the four corners corresponding to the bottom of the steel member on the floor under the steel member is determined, and the point position is marked.
S3, fixing a first steel member at a support, directly paying off and positioning one end of the first steel member at the support on an anchor bolt, fixing the first steel member by spot welding, supporting the other end of the first steel member by using a supporting column 200, and arranging a supporting plate 201 at the bottom of the supporting column 200 for enhancing the stability of the supporting column 200;
s4, positioning the other end of the first steel member, aligning the root of the telescopic vertical rod 300 to the point position of the steel member on a horizontal floor, adjusting the vertical rod to be vertical according to a level meter 303, placing a tower ruler 400 close to the vertical rod, using a level gauge 500 to measure the elevation of the point position of the steel member, adjusting the height of the telescopic stainless steel vertical rod to enable the top of the telescopic stainless steel vertical rod to be flush with the elevation, wherein the center of the top of the telescopic vertical rod 300 is the spatial position of the point position of the steel member, the telescopic vertical rod 300 comprises a telescopic rod 301, a fixed support 302 and a level meter 303, the telescopic rod 301 is installed at the top of the fixed support 302, the level meter 303 is installed at one side of the telescopic rod 301, and the level meter 303 is used for detecting the verticality of the telescopic vertical rod 300;
s5, rigidly fixing a steel member, erecting a portal frame 100 at the other end of the steel member, adjusting the position of the steel member by a hoist 600 to enable a target point to fall on the center of the top of a telescopic vertical rod 300, keeping the steel member still, placing a support column 200 and adjusting the height under the steel member, spot-welding the temporarily fixed steel member, adjusting the portal frame 100 to fix the position of the steel member, wherein the portal frame 100 comprises a cross beam 101, an inclined support bracket 102, a support frame 103, a fixed pipe 104 and a U-shaped top support 105, the support frame 103 is installed at two sides of the bottom of the cross beam 101, the inclined support bracket 102 is installed between the cross beam 101 and the support frame 103, the fixed pipe 104 is installed at one side of the support frame 103, the outer wall of one end of the U-shaped top support 105 is in threaded connection with the inner wall of the fixed pipe 104, and the U-shaped top support 105 is used for contacting with the steel member to fix the position of the steel member, the number of the fixed pipes 104 and the U-shaped jacking brackets 105 is four, two fixed pipes 104 and two U-shaped jacking brackets 105 are taken as one group, two groups of the fixed pipes 104 and the U-shaped jacking brackets 105 are symmetrically arranged on the inner side of the support frame 103, the U-shaped jacking brackets 105 are used for fixing the position of the steel member 700 through mutual matching with the fixed pipes 104, after the steel member 700 is positioned, support columns 200 are arranged at the bottom of the steel member 700 and used as temporary support columns and firmly fixed on a floor slab, the support columns 200 are 18H-shaped steel, two fixed pipes are welded on two sides of a portal frame respectively, the steel member is jacked tightly by the U-shaped jacking brackets, and the steel member is fixed;
s6, preheating the steel member, namely preheating by using an electric heater and measuring the temperature at any time by using a temperature detector, wherein the preheating area is arranged on two sides of the welding groove, the preheating width is more than 1.5 times of the thickness of the welding part and is not less than 100mm, and the preheating temperature is measured on the reverse side of the welded member;
s7, symmetrically welding by two welders at the same time, welding the backing weld of the whole structure node, then welding the filling weld of the whole structure node, and finally welding the cover surface of the welded node, wherein the backing weld is used for freely releasing the stress of each layer;
s8, positioning a second steel member, erecting portal frames 100 at two ends of the second steel member respectively, adjusting the second steel member by adopting a hoist 600, aligning the roots of two telescopic vertical rods 300 with the positions of the steel members projected on the floor slab at two ends of the second steel member, adjusting the vertical rod to be vertical according to a level gauge 303, placing a tower staff 400 close to the vertical rod, using a level gauge 500 to read the elevation between two ends and point positions of a second steel member, respectively adjusting two telescopic stainless steel vertical rods to enable the tops of the two telescopic stainless steel vertical rods to be flush with the elevations corresponding to the two ends of the second steel member, adjusting the positions of the two ends of the steel member by using a hoist 600 to enable a target point to fall in the center of the top of the telescopic vertical rod 300, keeping the steel member still, placing a support column 200 and adjusting the height under the steel member, spot-welding the temporarily fixed steel member, adjusting a portal frame 100 to tightly extrude the steel member, and fixing the position of the steel member;
s9, preheating a second steel member, performing preheating treatment by adopting an electric heater and measuring the temperature at any time by using a temperature detector, wherein the preheating area is arranged on two sides of the welding groove, the preheating width is more than 1.5 times of the thickness of a welding part and is not less than 100mm, and the preheating temperature is measured on the reverse side of the welding part;
s10, welding a second steel member, symmetrically welding two welders at the same time, welding the whole structural joint by backing welding, then welding the whole structural joint by filling welding, and finally welding the cover surface of the welded joint, wherein the backing welding is used for freely releasing the stress of each layer;
and S11, repeating S8-S10, and completely installing the rest steel structures.
The embodiment of the invention is also realized by the following technical scheme.
Referring to the attached drawings 1-5, in the embodiment of the invention, one-layer backing welding is performed, high-current welding is adopted for enabling the root to be penetrated, after one-layer welding seam is welded, slag, splashing and welding beading are removed completely, the quality of the welding seam is checked, after no defect exists, the welding seam of the second layer is welded, the residence time of the welding arc at a certain point is strictly controlled, the staggered distance between the welding joints of the two layers is 2-3 mm, and the welding joints of the two layers cannot be overlapped.
The invention provides a method for installing a spiral steel stair in a limited space, which is characterized in that when a steel member 700 is designed in a deepening design stage, the shrinkage is reserved, a smaller welding seam size is adopted, unnecessary welding seams are reduced, groove welding is adopted, fillet welding is reduced, the welding seam position is reasonably arranged, the welding seam is symmetrical to a section neutral axis or is closer to the section neutral axis, a portal frame 100 is used as a movable jig frame during welding, the steel member 700 is hoisted by matching with a hoist 600, the horizontal positions of four corresponding corner projections at the bottom of the steel member 700 are put on the ground and marked to obtain corresponding point positions, a self-made vertical telescopic stainless steel upright post is used, the upright post alignment point positions are used for adjusting the verticality, the elevation is measured by using a level gauge 500 and a tower ruler 400, the top end of a telescopic upright post 300 is adjusted to be consistent with the measured elevation, the steel member 700 is spatially three-dimensionally positioned, the portal frame 100 is adjusted to fix the steel member 700, the symmetric welding is carried out after the preheating of the welding part, so that the problems that the steel member 700 existing in the installation process of the spiral steel staircase in the limited space is easy to deform after welding, large machinery cannot be used, and the quality is difficult to ensure are solved
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 (3)
1. The installation method of the spiral steel stairs in the limited space is characterized by comprising the following steps:
s1, designing a steel member, reserving shrinkage of a steel structure deepening drawing in the process of designing the steel member, reducing welding seams, adopting groove welding and reducing fillet welding, wherein the welding seams are symmetrical to a neutral axis of a section or close to the neutral axis;
s2, carrying out steel member plane paying-off positioning, paying-off positioning the plane positions of the four corners corresponding to the bottom of each steel member according to a deepening drawing, and marking the point positions of the four corners corresponding to the bottom of each steel member on the position right below a floor slab;
s3, fixing a first steel member at a support, directly paying off and positioning one end of the first steel member at the support on an anchor bolt, fixing the first steel member by spot welding, and supporting the other end of the first steel member by using a supporting column;
the bottom of the supporting column is provided with a supporting plate for enhancing the stability of the supporting column;
s4, positioning the other end of the first steel member, aligning the root of the telescopic vertical rod to the point position of the steel member on a horizontal floor, adjusting the vertical rod to be vertical according to a level gauge, placing a tower ruler close to the vertical rod, using the level gauge to dip the elevation of the point position of the steel member, adjusting the height of the telescopic stainless steel vertical rod to enable the top of the telescopic stainless steel vertical rod to be flush with the elevation, and determining the center of the top of the telescopic vertical rod as the spatial position of the point position of the steel member;
the telescopic vertical rod comprises a telescopic rod, a fixed support and a level meter, wherein the telescopic rod is installed at the top of the fixed support, the level meter is installed on one side of the telescopic rod, and the level meter is used for detecting the verticality of the telescopic vertical rod;
s5, rigidly fixing a steel member, erecting a portal frame at the other end of the steel member, adjusting the position of the steel member by using a hoist to enable a target point to fall on the center of the top of the telescopic vertical rod, keeping the steel member stationary, placing a support column under the steel member and adjusting the height, temporarily fixing the steel member by spot welding, and adjusting the portal frame to fix the position of the steel member;
the portal frame comprises a cross beam, an inclined strut support, a support frame, a fixed pipe and a U-shaped top support, wherein the support frame is installed on two sides of the bottom of the cross beam, the inclined strut support is installed between the cross beam and the support frame, the fixed pipe is installed on one side of the support frame, the outer wall of one end of the U-shaped top support is in threaded connection with the inner wall of the fixed pipe, and the U-shaped top support is used for contacting with a steel member to fix the position of the steel member;
s6, preheating the steel member, namely preheating by using an electric heater and measuring the temperature at any time by using a temperature detector, wherein the preheating area is arranged on two sides of the welding groove, the preheating width is more than 1.5 times of the thickness of the welding part and is not less than 100mm, and the preheating temperature is measured on the reverse side of the welded member;
s7, symmetrically welding by two welders at the same time, welding the backing weld of the whole structure node, then welding the filling weld of the whole structure node, and finally welding the cover surface of the welded node, wherein the backing weld is used for freely releasing the stress of each layer;
s8, positioning a second steel member, erecting portal frames at two ends of the second steel member respectively, adjusting the second steel member by a hoist, aligning roots of two telescopic vertical rods with points of the steel member projected on a floor at two ends of the second steel member, adjusting the vertical rods to be vertical according to a level, placing a tower staff close to the vertical rods, using the level to read the elevation between the two ends and the points of the second steel member, adjusting the two telescopic stainless steel vertical rods respectively to enable the tops of the two telescopic stainless steel vertical rods to be flush with the elevations corresponding to the two ends of the second steel member respectively, adjusting the positions of the two ends of the steel member by the hoist to enable target points to fall in the center of the tops of the telescopic vertical rods, keeping the steel member stationary, placing support columns under the steel member and adjusting the height, spot-welding the temporarily fixed steel member, adjusting the portal frames to squeeze the steel member tightly, and fixing the position of the steel member;
s9, preheating a second steel member, performing preheating treatment by adopting an electric heater and measuring the temperature at any time by using a temperature detector, wherein the preheating area is arranged on two sides of the welding groove, the preheating width is more than 1.5 times of the thickness of a welding part and is not less than 100mm, and the preheating temperature is measured on the reverse side of the welding part;
s10, welding a second steel member, symmetrically welding two welders at the same time, welding the whole structural joint by backing welding, then welding the whole structural joint by filling welding, and finally welding the cover surface of the welded joint, wherein the backing welding is used for freely releasing the stress of each layer;
and S11, repeating S8-S10, and completely installing the rest steel structures.
2. The limited space spiral steel stair installation method of claim 1, wherein: fixed pipe with the quantity that the U type top held in the palm is four, uses two fixed pipe with the U type top holds in the palm is a set of, and is two sets of fixed pipe with U type top holds in the palm the symmetry set up in the inboard of support frame, U type top hold in the palm be used for through with fixed pipe is mutually supported fixedly the position of steel member.
3. The limited space spiral steel stair installation method of claim 1, wherein: in the steps S7 and S10, one layer of backing weld is performed, and high-current welding is performed to penetrate the root of the weld, after one layer of weld is welded, the weld is cleaned of slag, spatter and flash, the quality of the weld is checked, after the weld is free of defects, the weld of the second layer is welded, the residence time of the welding arc at a certain point is strictly controlled, the staggered distance between the welding joints between the two layers is 2-3 mm, and the welding joints between the two layers cannot be overlapped.
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| CN101774109B (en) * | 2010-01-19 | 2011-12-28 | 江苏沪宁钢机股份有限公司 | Method for manufacturing double-spiral steel staircase without middle standing pillar |
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| CN102505860B (en) * | 2011-10-21 | 2013-01-02 | 温州建设集团有限公司 | Novel Lifting method for irregularly-shaped steel structure member |
| CN103628639B (en) * | 2012-08-30 | 2016-01-20 | 宁波市镇海捷登应用技术研究所 | A kind of spiral steel frame staircase and preparation method thereof |
| CN105421792A (en) * | 2015-12-15 | 2016-03-23 | 安徽伟宏钢结构集团股份有限公司 | Lifting construction process of modular steel structural components |
| CN108723630B (en) * | 2018-06-28 | 2021-03-26 | 二十二冶集团装备制造有限公司 | Manufacturing method of spiral twisted box |
| CN109403640B (en) * | 2018-11-19 | 2020-11-27 | 北京市机械施工有限公司 | Mounting method of indoor oversized single-ladder-beam cantilever type rotating steel stair |
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2020
- 2020-10-19 CN CN202011115767.0A patent/CN112276391B/en active Active
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