CN115637872A - Construction method for installing cross-floor inclined column in existing floor - Google Patents
Construction method for installing cross-floor inclined column in existing floor Download PDFInfo
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- CN115637872A CN115637872A CN202211533513.XA CN202211533513A CN115637872A CN 115637872 A CN115637872 A CN 115637872A CN 202211533513 A CN202211533513 A CN 202211533513A CN 115637872 A CN115637872 A CN 115637872A
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Abstract
The invention relates to the technical field of construction measures of existing buildings, and discloses a construction method for installing cross-floor batter posts in existing floors. The problems encountered in the installation of the batter post are solved by the technical means, for example, the load on the existing steel beam is obtained in advance before the existing steel beam is cut off, and the steel beam is jacked back by the same force, so that the steel beam is prevented from being warped downwards or upwards after being cut off; the inclined column sections are hoisted by a plurality of traveling cranes along the length direction at two sides of the inclined column section, and then the inclined column sections are translated in place and turned over in the rectangular construction hole, so that the turning over is easy, and the posture adjustment is completed while the turning over is carried out; by adjusting the welding seam distribution and the welding process of the inclined column and the existing upright column, the danger caused by welding with stress is avoided.
Description
Technical Field
The invention relates to the technical field of construction measures for existing buildings, in particular to a construction method for installing cross-storey batter posts in existing storeys.
Background
The upper half of some modern high-rise buildings sometimes needs to be modified to other styles for aesthetic reasons, specific display purposes, or architectural uses. For buildings with reinforced concrete as the primary load-bearing member, this means that the upper half must be removed for reconstruction. However, for a building using steel beams and steel columns as main bearing components, most components of the upper half of the building can be theoretically reserved, the original load is transferred to a new supporting structure in a mode similar to truss support replacement, and then the original supporting structure is removed.
The diameter-variable reconstruction of the building is a building reconstruction mode which can keep the original components as much as possible. For example, a building with a hectometer square cross section is transformed into an upper half 80 meters square and a lower half hectometer square (the upper half cannot be larger than the lower half, otherwise, the lower half cannot be supported after transformation), the upper and lower parts are connected through supporting members such as inclined columns, and the inclined columns are inclined inwards.
This, however, causes various problems in the mounting of the batter post. Because there is the floor in batter post top in addition, the back has had the post segmentation that has been replaced by it when the batter post was installed, and has had girder steel and floor on the post still can not torn open, therefore the batter post must pass floor and girder steel (the girder steel transmits the load of floor to having the post, transmits the batter post after the building transformation, therefore the girder steel tip need be in the batter post installation back top on the batter post), this has brought the problem of five aspects for the construction:
1. when the inclined columns are installed, the steel beams penetrate through the steel beams, so that the steel beams are broken, the broken steel beams are loaded, the broken steel beams can be bent downwards, and if the inclined columns are pushed back blindly, the floor slabs can be damaged by upwarping;
2. the inclined column needs to penetrate through a floor slab in the hoisting process, the height of the inclined column is higher than the single-layer height of a building (otherwise, the inclined degree of the inclined column is too high, and the component force in the horizontal direction is too large to damage the building), the inclined column cannot vertically penetrate through a construction hole in the floor slab like a conventional column, and the posture of the inclined column needs to be adjusted after the inclined column is in place.
3. The lower end of the batter post needs to be welded on the side face of the existing post (part of the upper half of the existing post is replaced by the batter post, but the batter post still needs to be installed on the lower half of the existing post, if the upper half of the existing post is bolted, the rigidity and the strength of a joint are not enough, the batter post needs to be welded, and the upper half of the existing post is still welded during welding, so that the batter post can only be welded on the side face of the existing post), and the existing post has stress (the existing post supports the upper half of the building).
4. The upper ends of the batter posts at the corners of the building can be crossed together, if two crossed batter posts are installed in sequence, the batter posts installed in sequence influence the batter posts installed later, and if the batter posts are installed at the same time, the lower ends of the batter posts are difficult to align.
5. The upper end of the batter post applies horizontal inward pressure to the building, and the lower end applies horizontal outward tension to the building, which may exceed the bearing capacity of the steel beam (the steel beam is designed without some component force, so the design does not consider some component force).
Disclosure of Invention
The invention provides a construction method for installing a cross-storey batter post in an existing storey.
The technical problem to be solved is that: when the building reducing transformation is carried out, a cross-layer batter post needs to be installed, and the installation has multiple difficulties.
In order to solve the technical problems, the invention adopts the following technical scheme: a construction method for installing cross-floor inclined columns in an existing floor is characterized in that the inclined columns correspond to existing upright columns one by one, extend upwards from the side faces of the existing upright columns in an inclined mode and penetrate through at least one floor slab, and existing steel beams which are connected with the existing upright columns and used for supporting the floor slabs are arranged at the bottoms of the floor slabs;
the inclined column is formed by connecting a plurality of inclined column sections from top to bottom end by end in sequence, and each inclined column section corresponds to one floor slab and penetrates through the corresponding floor slab;
the construction method comprises the following steps:
the method comprises the following steps: a construction hole for the inclined column to penetrate through and for material transfer is formed in the floor slab corresponding to the first inclined column section;
step two: cutting off the existing steel beam below the construction hole in the first step, firstly acquiring the load applied to the existing upright post by the cut-off part before cutting off, and applying the force with the same magnitude as the acquired load by using the temporary support structure to carry out back jacking;
step three: hoisting the inclined column sections along the construction hole and completing the connection of the lower ends of the inclined column sections, and then supplementing the existing steel beam sections cut off in the second step to connect the inclined column, the existing upright columns and the existing steel beams into a whole;
step four: repeating the first step to the third step to complete the installation of the next inclined column subsection until all the inclined column subsections are installed;
step five: and connecting the upper end of the inclined column with a structure supported by the inclined column, then replacing the support, dismantling the temporary support structure after the support replacement is finished, and filling each construction hole.
Further, in the second step, the following construction cross-layer turning-over hoisting system is adopted for hoisting:
the cross-layer turning and hoisting system is arranged at the bottom of the floor slab above the floor slab corresponding to the inclined column segment to be hoisted, and comprises slide rails which are parallel to the existing steel beam, arranged on the left side and the right side below the existing steel beam and fixedly connected with the existing steel beam, a plurality of chain blocks are arranged on each slide rail at intervals along the length direction, the upper ends of the chain blocks are arranged on the slide rails in a sliding manner, and slings are downwards hooked on the inclined column segment;
the construction holes in the floor slab corresponding to the inclined column sections are rectangular holes which are parallel to the existing steel beam in the length direction and are arranged right below the existing steel beam.
Further, in the second step, the hoisting process is as follows:
flatly placing the inclined column sections on the corresponding floor slabs at positions right below the existing steel beams, wherein the lower ends of the inclined column sections face the construction hole, the left side and the right side of each inclined column section respectively correspond to the two sliding rails, and slings of chain blocks on the sliding rails are hooked on one corresponding side of each inclined column section; hoisting the inclined column segment and moving the inclined column segment to the position above the construction hole along the slide rail, then adjusting the length of each sling to enable the lower end of the inclined column segment to descend and penetrate through the construction hole to reach the installation position, and finally finely adjusting the length of each sling to enable the posture of the inclined column segment to be the posture during installation.
Furthermore, the inclined columns are welded with the existing upright columns, and all the inclined column sections are welded; the welding seam of the first inclined column segment and the existing upright column comprises a plurality of vertically arranged main welding seams with aligned upper and lower ends, the same position of each main welding seam is provided with a breaking notch for breaking the main welding seam and facilitating the entering of a welding gun, a horizontal rigidity lifting welding seam is arranged at the junction position of the main welding seam and the breaking notch, and two rigidity lifting welding seams are arranged between the main welding seams;
one end of each main welding line close to the installation foundation of the existing upright post is marked as a starting end, each main welding line is synchronously welded from the starting end, and the welding progress of each main welding line is consistent in the welding process; and welding rigidity improving welding seams after the main welding seams are welded.
Further, the existing upright post is provided with a supporting platform for supporting the first inclined post section, and the two adjacent inclined post sections are temporarily connected and fixed through a temporary fixing lug plate before welding.
Further, the temporary support structure comprises a back-jacking column arranged below the end part of the reserved part of the existing steel beam to be broken and a back-jacking inclined strut arranged between the bottommost back-jacking column and the existing upright column; the lower end of the back-jacking inclined strut is welded and connected with the existing upright post through a plurality of vertical welding lines, and the upper end of the back-jacking inclined strut props the lowest back-jacking post through a floor slab and an existing steel beam; the jacking column is provided with a height adjusting base fixedly connected with the jacking column, the height adjusting base comprises two horizontal steel plates and a plurality of reading type jacks which are vertically arranged and clamped between the two horizontal steel plates, and the reading type jacks are respectively fixedly connected with the two horizontal steel plates.
Furthermore, each reading type jack is an electric remote control jack with a sensor for measuring jacking force, a plurality of reading type jacks in each height adjusting base are electrically connected with a lower computer, and each lower computer is electrically connected with an upper computer.
Further, in the second step, the force of the back prop is controlled by adopting the following method:
in each jacking column, the jacking force required by the jacking column is respectively marked as F, the number of the reading type jacks in the height adjusting base is marked as N, and the jacking force which each reading type jack should reach is F/N;
inputting the values of F and N of each ejection column into an upper computer, and then distributing the F/N value of each ejection column to each lower computer by the upper computer;
and when the jack is jacked back, the reading type jacks start to jack simultaneously, and each reading type jack stops jacking until all jacks stop jacking when the jacking force of one reading type jack reaches the F/N value of the corresponding jack-back column.
Furthermore, the existing upright columns are arranged at intervals around the periphery of the building, two adjacent existing upright columns are connected into a whole through ring beams with the same installation height as the existing steel beams, and after the three-oblique-column sectional installation is completed, the two adjacent oblique columns are connected through the ring beams with the same installation height as the supplemented steel beams installed between the oblique columns.
Furthermore, the batter post is a square steel pipe post surrounded by four steel plates, and the cross section of the building is rectangular; the batter post segmentation at two batter post tops of rectangle four corners position is even as an organic whole before the installation, and note the A post, the difficult steel sheet that aligns of steel sheet note of constituteing the A post, in the four steel sheets of every branch of A post, the breach that is used for conveniently aligning is left to the lower extreme of a steel sheet, A post hoist and mount back in place, align earlier and weld the difficult steel sheet that aligns that does not have the breach, then measure shape and size that difficult alignment steel sheet welding back breach becomes and according to measuring result processing benefit board, fill in the breach and with breach border welded connection.
Compared with the prior art, the construction method for installing the cross-floor batter post in the existing floor has the following beneficial effects:
in the invention, the load on the existing steel beam is obtained in advance before the existing steel beam is cut off, and the stubble cutting part is jacked back by the same force, so that the existing steel beam is ensured not to be downwarped and not to be upwarped after being cut off;
according to the invention, the batter post is divided into a plurality of sections with the lengths similar to the height of a building layer for installation, so that the turnover difficulty of the batter post is reduced; the inclined column is crossed with the existing steel beam, a slide rail is arranged under the existing steel beam, a chain block is arranged on the slide rail to form a travelling crane, the inclined column is not turned over and then translated to the position during hoisting, the inclined column sections are laid flat, a plurality of travelling cranes are used for hoisting the inclined column sections along the length direction at two sides of the inclined column, the inclined column sections are translated to the position firstly, and then the inclined column sections are turned over in a rectangular construction hole (the travelling crane stay cable at the lower part is more downwards, the travelling crane closer to the inclined column installation position is more), so that the inclined column sections cannot be clamped and turned over due to insufficient floor height, and the posture adjustment is completed while the inclined column sections are turned over, so that the inclined column sections can be directly connected after being in place;
according to the invention, the main welding line between the inclined column and the existing upright column is arranged along the length direction of the existing upright column, and the expansion and contraction directions (towards the left side and the right side) of the main welding line are perpendicular to the internal stress direction of the existing upright column, so that the transmission of the internal stress of a bearing member is not influenced, and the yield and collapse of the existing upright column caused by expansion and contraction during welding are avoided; meanwhile, the molten pool is very small on the cross section of the existing upright post, and the existing upright post cannot yield and collapse due to excessive fusing; the problem of insufficient rigidity of a connecting joint (two welding lines are criss-cross) caused by only arranging the main welding line is solved by arranging the rigidity lifting welding line perpendicular to the main welding line; by leaving an interruption notch on the main welding seam, then arranging a rigidity lifting welding seam at the junction of the interruption notch and the main welding seam, and welding the rigidity lifting welding seam after the main welding seam is connected, the smooth operation of welding seam polishing, welding liner installation, welding gun entering and the like is ensured, and because the inclined column segments are respectively connected with the two sides of the rigidity lifting welding seam like a bridge after the main welding seam is welded, the welding of the rigidity lifting welding seam is carried out at this time, and no danger is caused (the load on the existing upright column is transmitted by means of the inclined column segments);
in the invention, the uppermost inclined column of the two inclined columns at the angular position of the building is hoisted after being welded in advance, so that the interference problem caused by successive installation is solved and the strength is improved; the gap is left at the lower end of the two inclined column sections connected together without welding, and the gap is compensated by measuring and processing a compensating plate after the gap is aligned with the lower inclined column section and welded, so that the problem that the lower ends of the two inclined column sections connected together are difficult to align is solved;
according to the invention, two layers of ring beams (the ring beams between the existing upright posts are reserved after construction, and the ring beams between the inclined posts are newly added) are arranged, so that the horizontal force of the upper end and the lower end of each inclined post can be resisted.
Drawings
FIG. 1 is a schematic view of a construction hole at the first step and a temporary support structure at the second step;
FIG. 2 is a schematic view of the second step of detaching the steel beam;
FIG. 3 is a schematic view of step three installation of a first batter post section;
FIG. 4 is a schematic view of step three installation of a collar beam between the batter posts;
FIG. 5 is a schematic view of the four steps after the installation of the oblique columns in the segmented manner;
FIG. 6 is a schematic diagram of a sectional hoisting process of the batter post;
FIG. 7 is a schematic view of a slide rail arrangement;
the method comprises the following steps of 1-floor slab, 2-inclined column segmentation, 31-existing upright column, 32-existing steel beam, 4-ring beam, 5-construction hole, 61-back-jacking column, 62-height adjusting base, 63-back-jacking inclined strut, 7-chain block and 8-sliding rail.
Detailed Description
As shown in fig. 1-7, a construction method for installing cross-floor batter posts in an existing floor, the batter posts correspond to existing upright posts 31 one by one, extend from the side surfaces of the existing upright posts 31 obliquely upwards, and penetrate at least one floor 1, and the bottom of each floor 1 is provided with an existing steel beam 32 connected with the existing upright posts 31 and used for supporting the floor 1;
the inclined column is formed by connecting a plurality of inclined column sections 2 from top to bottom in sequence end to end, and each inclined column section 2 corresponds to one floor slab 1 and penetrates through the corresponding floor slab 1;
the construction method comprises the following steps:
as shown in fig. 1, step one: a construction hole 5 for the inclined column to pass through and for material transfer is formed in the floor slab 1 corresponding to the first inclined column section 2;
as shown in fig. 1-2, step two: cutting off the existing steel beam 32 below the construction hole 5 in the first step, firstly acquiring the load applied to the existing upright column 31 by the cut part before cutting off, and applying the force with the same magnitude as the acquired load by using the temporary support structure to carry out back jacking; the back-jacking position is a stubble breaking position of the part of the steel beam which is not cut off;
when the load applied to the existing columns 31 from the cut portions of the existing steel beams 32 is determined, if the existing steel beams 32 are uniformly distributed and have the same specification, the self weight of the floor 1 is divided by the number of the existing steel beams 32, then divided by 2, and then the self weight of the steel beams is added. Complicated, finite element software such as midas is required for the solution.
As shown in fig. 3, step three: hoisting the inclined column subsection 2 along the construction hole 5 and completing the connection of the lower end of the inclined column subsection 2, and then repairing the existing steel beam 32 subsection cut off in the second step to enable the inclined column to be connected with the existing upright column 31 and the existing steel beam 32 into a whole; that is, the batter post is inserted into the existing steel beam 32.
As shown in fig. 5, step four: and (5) repeating the first step to the third step to finish the installation of the next batter post segment 2 until all batter post segments 2 are installed.
Step five: the upper end of the batter post is connected with the structure supported by the batter post. In this embodiment, a new column is installed in the structure above the batter post, aligned up and down with the upper end of the batter post, where the new column and batter post are connected by steel columns. After the connection, the support is replaced, that is, the replaced part of the existing upright column 31 is removed, so that the load is gradually transferred to the inclined column. When the support is changed, the support can be changed by referring to the steel truss, and the load is gradually transferred by adopting a jack. And after the support replacement is finished, the temporary support structure is dismantled and each construction hole 5 is filled.
And step two, hoisting by adopting the following construction cross-layer turning-over hoisting system:
as shown in fig. 6-7, the cross-layer turning and hoisting system is arranged at the bottom of the floor slab 1 above the floor slab 1 corresponding to the batter post segment 2 to be hoisted, and comprises slide rails 8 which are parallel to the existing steel beams 32, arranged at the left and right sides below the existing steel beams 32, and fixedly connected with the existing steel beams 32, wherein a plurality of chain blocks 7 are arranged on each slide rail 8 at intervals along the length direction, the upper ends of the chain blocks 7 are slidably arranged on the slide rails 8, and slings are downwards hooked on the batter post segment 2;
that is to say, the two rows of chain blocks 7 are used for hanging the left side and the right side of the lying batter post segment 2, and only one row is used, so that the batter post segment 2 is easy to rotate, the batter post segment cannot smoothly enter the construction hole 5, and the posture cannot be controlled as required.
The construction hole 5 on the floor slab 1 corresponding to the inclined column subsection 2 is a rectangular hole which is parallel to the existing steel beam 32 in the length direction and is arranged right below the existing steel beam 32. The rectangular hole is used for matching the movement track of the inclined column segment 2 during turning.
As shown in fig. 7, the slide rail 8 is an i-steel with a flange plate horizontally disposed, the pulley of the chain block 7 is fixed on an i-steel pulley, and the i-steel pulley is slidably disposed on the slide rail 8. The end part of the slide rail 8 is blocked with a blocking plate for preventing the I-shaped steel pulley from falling off. The I-steel pulley is mature equipment and can be directly purchased from the market, such as Tuo Xing CH-III.
The existing steel beam 32 is an i-shaped steel with a flange plate horizontally arranged, web stiffening ribs are arranged on the existing steel beam 32 at intervals along the length direction, and the sliding rail 8 is fixedly connected with the web stiffening ribs. In use, the existing steel beam 32 has stresses in the flange plates and the web plates, and if bolts are installed or welded at these positions, the existing steel beam will be damaged and the bearing capacity will be affected. Web stiffeners do not have this problem and have very low internal stresses. If no web stiffeners are present, the skid rails 8 can be mounted by clamping plates that are clamped to the left and right sides of the existing steel beams 32 and are connected together by tie-bolts that are higher than the existing steel beams 32 and lower than the existing steel beams 32, and then bolting the skid rails 8 to the clamping plates.
As shown in fig. 6, in the second step, the hoisting process is specifically as follows:
flatly placing the inclined column subsection 2 on the corresponding floor slab 1 at a position right below the existing steel beam 32, wherein the lower end of the inclined column subsection faces the construction hole 5, the left side and the right side of the inclined column subsection 2 respectively correspond to the two slide rails 8, and the sling of the chain block 7 on the slide rails 8 is hooked on one side corresponding to the inclined column subsection 2; hoisting the batter post segment 2 and moving the batter post segment to the upper part of the construction hole 5 along the slide rail 8, then adjusting the length of each sling to enable the lower end of the batter post segment 2 to descend and penetrate the construction hole 5 to reach the installation position, and finally finely adjusting the length of each sling to enable the posture of the batter post segment 2 to be the posture during installation.
The inclined columns are welded with the existing upright columns 31, and all the inclined column sections 2 are welded; the welding seam of the first batter post segment 2 and the existing upright post 31 comprises a plurality of vertically arranged main welding seams with aligned upper and lower ends, the same position of each main welding seam is provided with a breaking notch for breaking the main welding seam and facilitating the entering of a welding gun, the junction position of the main welding seam and the breaking notch is provided with a horizontal rigidity lifting welding seam, and the two welding seams are criss-cross to lift the rigidity; two rigidity-improving welding seams are arranged between the main welding seams, and the rigidity-improving welding seams are welded after the main welding seams are welded.
That is to say. The oblique column section 2 is like a bridge with two piers and is connected with the existing upright column 31 by main welding lines, each main welding line is divided into two sections, the two sections are equivalent to the two piers of the bridge, after the main welding lines are welded, the safety of various operations performed on the part, located between the two piers, of the existing upright column 31 is guaranteed, and even the welding mode with the cutting effect in a short time like full penetration welding does not cause collapse.
One end of each main welding line close to the installation foundation of the existing upright column 31 is recorded as a starting end, each main welding line is synchronously welded from the starting end, and the welding progress of each main welding line is consistent in the welding process; the stress at the connecting position is ensured to be uniform, and the local yield caused by uneven stress is avoided.
The existing upright column 31 is provided with a supporting platform for supporting the first inclined column section 2, and the two adjacent inclined column sections 2 are temporarily connected and fixed through a temporary fixing lug plate before welding. The temporary fixing ear plates are respectively welded with the two sides of the seam. The temporary fixing lug plate comprises two parallel steel plates which are connected into a whole through a row of bolts distributed along the length direction of the rod piece so as to improve the rigidity.
The main welding seams and the rigidity lifting welding seams are both single-side groove welding, each main welding seam is a primary full penetration welding seam, and at least one rigidity lifting welding seam is a primary full penetration welding seam. The main weld is used to transfer force, and the stiffness-enhancing weld is used to enhance stiffness, all of which need not be made into a one-level full penetration weld.
Note that the groove needs to be cleaned and polished before welding, the groove of the main weld joint faces the outside uniformly so as to facilitate welding, and the welding liner selects a steel pad for use so as to avoid dropping. Part of the soldering pad needs to be mounted inside and can be put in by breaking the gap.
In the welding process of the main welding line and the rigidity-improved welding line, the temperature of a low-temperature heat affected zone of the welding line is ensured not to exceed 100 ℃ in a way of subsection priming and welding speed control. The area of the low temperature heat affected zone is large, and if the temperature is higher than 100 ℃, the strength of the part will be reduced, which may cause danger.
Before welding, the welding seam joint is preheated to 40-150 ℃, and the welding of the rigidity-improving welding seam is carried out after the main welding seam is cooled to below 40 ℃. The cooling to the temperature below 40 ℃ has two functions, namely, avoiding scalding when the rigidity in the welding is improved, and ensuring that the main welding seam has enough strength.
The temporary support structure includes a back-up post 61 disposed below the end of the retained portion of the existing steel beam 32 to be interrupted, and a back-up diagonal brace 63 disposed between the lowermost back-up post 61 and the existing column 31; the lower end of the back-jacking inclined strut 63 is connected with the existing upright post 31 through a plurality of vertical welding lines in a welding way, and the upper end of the back-jacking inclined strut is used for jacking the lowest back-jacking post 61 through a floor 1 and an existing steel beam 32; here the upper end of the diagonal brace is welded at the position of the bottom of the existing steel beam 32 below the back prop 61; the fore-set has with back fore-set 61 fixed connection's altitude mixture control base 62, and altitude mixture control base 62 includes two horizontal steel sheets and a plurality of vertical settings and presss from both sides the reading formula jack between two horizontal steel sheets, reading formula jack respectively with two horizontal steel sheet fixed connection.
Here, a plurality of reading type jacks arranged in a matrix shape are arranged in each height adjusting base 62, so that firstly, the single jack is prevented from being inclined, and secondly, the jacking force is ensured to be accurate (the jacking force of the jack has a large measurement error, and the displayed value is different from the actual value, and the errors can be mutually offset by a plurality of jacks).
Each reading type jack is an electric remote control jack with a sensor for measuring jacking force, a plurality of reading type jacks in each height adjusting base 62 are electrically connected with a lower computer, and each lower computer is electrically connected with an upper computer. The upper computer is a computer which can directly send out an operation command and is a computer with a screen. The lower computer is a computer which directly controls equipment to obtain equipment conditions, and is generally a PLC/single chip microcomputer. The command sent by the upper computer is firstly sent to the lower computer, and the lower computer is interpreted into a corresponding time sequence signal according to the command to directly control the corresponding equipment.
In the second step, the force of the ejection column 61 is controlled by the following method:
in each jack-returning column 61, the jack-returning force required to be provided by the jack-returning column 61 is respectively recorded as F, the number of the reading type jacks in the height adjusting base 62 is recorded as N, and the jack force which each reading type jack should reach is F/N; the size of F is the load obtained in step two. The dead weight of the back post 61 and the height adjustment base 62 is small compared to F and is negligible in calculation. If the end of the existing steel beam 32 remote from the stubbles is a hinge joint, it is necessary to ignore this, and the force of the return top can be made a little smaller than the required value, so as to ensure that the stubbles of the existing steel beam 32 do not warp upward. If the end of the existing steel beam 32 far away from the stubbles is a rigid joint, the self-weight of the top-return column 61 and the height-adjusting base 62 can be added to the F/N so as to make the result more accurate.
Inputting the values of F and N of each ejection column 61 into an upper computer, and then distributing the F/N value of each ejection column 61 to each lower computer by the upper computer; and when the jack is jacked back, the reading type jacks start to jack simultaneously, and each reading type jack stops jacking until all jacks stop jacking when the jacking force of one reading type jack reaches the F/N value of the corresponding jack-back column 61.
As shown in fig. 4, the existing columns 31 are arranged at intervals around the periphery of the building, two adjacent existing columns 31 are connected into a whole through ring beams 4 with the same installation height as the existing steel beams 32, and after the three-batter post section 2 is installed, two adjacent batter posts are connected through the ring beams 4 with the same installation height as the supplemented steel beams installed between the batter posts.
Here, the two ring beams 4 can resist the force of the inclined column in the horizontal direction, and if the calculation shows that the force is not enough, horizontal supports can be additionally arranged at the top end and the bottom end of the inclined column and at the bottom of the floor slab 1.
The batter post is a square steel pipe column surrounded by four steel plates, and the cross section of the building is rectangular; the batter post segmentation 2 at two batter post tops of rectangle four corners position is even as an organic whole before the installation, and note the A post, the difficult steel sheet that aligns of steel sheet note of constituteing the A post, in the four steel sheets of every branch of A post, the breach that is used for conveniently aligning is left to the lower extreme of a steel sheet, A post hoist and mount back in place, align earlier and weld the difficult steel sheet that aligns that does not have the breach, then measure shape and size that difficult alignment steel sheet welding back breach becomes and according to measuring result processing benefit board, fill in the breach and with breach border welded connection.
If the notch is reserved, the alignment of the other three steel plates difficult to align can be ensured as far as possible in the alignment process, the steel plates difficult to align with the notch do not need to be considered, so that the machining tolerance is transferred to the notch, and the notch is repaired after welding.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A construction method for installing cross-floor batter posts in an existing floor, wherein the batter posts correspond to existing upright posts (31) one by one, extend obliquely upwards from the side surfaces of the existing upright posts (31) and penetrate through at least one floor (1), and the bottom of each floor (1) is provided with an existing steel beam (32) which is connected with the existing upright posts (31) and used for supporting the floor (1);
the method is characterized in that: the inclined column is formed by connecting a plurality of inclined column sections (2) from top to bottom end by end in sequence, and each inclined column section (2) corresponds to one floor slab (1) and penetrates through the corresponding floor slab (1);
the construction method comprises the following steps:
the method comprises the following steps: a construction hole (5) for the oblique column to pass through and for material transfer is formed in the floor slab (1) corresponding to the first oblique column section (2);
step two: cutting off the existing steel beam (32) below the construction hole (5) in the first step, firstly obtaining the load applied to the existing upright post (31) by the cut part before cutting off, and applying the force with the same magnitude as the obtained load by using the temporary supporting structure to carry out back jacking;
step three: hoisting the inclined column subsection (2) along the construction hole (5) and completing the connection of the lower end of the inclined column subsection (2), and then supplementing the existing steel beam (32) subsection cut off in the second step to enable the inclined column, the existing upright column (31) and the existing steel beam (32) to be connected into a whole;
step four: repeating the first step to the third step to finish the installation of the next batter post segment (2) until all batter post segments (2) are installed;
step five: and connecting the upper end of the inclined column with a structure supported by the inclined column, then replacing the support, dismantling the temporary support structure after the support replacement is finished, and filling each construction hole (5).
2. A construction method for installing a cross-storey batter post in an existing storey according to claim 1, wherein: and step two, hoisting by adopting the following construction cross-layer turning-over hoisting system:
the cross-layer turning and hoisting system is arranged at the bottom of the floor slab (1) above the floor slab (1) corresponding to the batter post segment (2) to be hoisted, and comprises sliding rails (8) which are parallel to the existing steel beam (32), arranged on the left side and the right side below the existing steel beam (32) and fixedly connected with the existing steel beam (32), a plurality of chain blocks (7) are arranged on each sliding rail (8) at intervals along the length direction, the upper ends of the chain blocks (7) are slidably arranged on the sliding rails (8), and slings are downwards hooked on the batter post segment (2);
the construction hole (5) in the floor (1) corresponding to the inclined column subsection (2) is a rectangular hole which is parallel to the existing steel beam (32) in the length direction and is arranged right below the existing steel beam (32).
3. A construction method for installing a cross-storey batter post in an existing storey according to claim 2, wherein: in the second step, the hoisting process is as follows:
flatly placing the inclined column subsection (2) on the corresponding floor slab (1) at a position right below the existing steel beam (32), wherein the lower end of the inclined column subsection faces towards the construction hole (5), the left side and the right side of the inclined column subsection (2) respectively correspond to the two sliding rails (8), and a sling of a chain block (7) on each sliding rail (8) is hooked on one corresponding side of the inclined column subsection (2); the inclined column subsection (2) is lifted and moved to the upper side of the construction hole (5) along the slide rail (8), then the lengths of the slings are adjusted to enable the lower end of the inclined column subsection (2) to descend and penetrate through the construction hole (5) to reach the installation position, and finally the lengths of the slings are finely adjusted to enable the posture of the inclined column subsection (2) to be the posture during installation.
4. A construction method for installing a cross-storey batter post in an existing storey according to claim 1, wherein: the inclined columns are welded with the existing upright columns (31), and all the inclined column sections (2) are welded; the welding seam of the first inclined column section (2) and the existing upright column (31) comprises a plurality of vertically arranged main welding seams of which the upper ends and the lower ends are aligned, the same position of each main welding seam is provided with a breaking notch for breaking the main welding seam and facilitating the entry of a welding gun, the junction position of the main welding seam and the breaking notch is provided with a horizontal rigidity lifting welding seam, and two rigidity lifting welding seams are arranged between the main welding seams;
one end of each main welding line close to the installation foundation of the existing upright post (31) is recorded as a starting end, each main welding line is synchronously welded from the starting end, and the welding progress of each main welding line is consistent in the welding process; and welding rigidity improving welding seams after the main welding seams are welded.
5. A construction method for installing a cross-storey batter post in an existing storey according to claim 4, wherein: the existing upright post (31) is provided with a supporting platform for supporting the first inclined post section (2), and the two adjacent inclined post sections (2) are temporarily connected and fixed through a temporary fixing lug plate before welding.
6. A construction method for installing a cross-storey batter post in an existing storey according to claim 1, wherein: the temporary support structure comprises a back-jacking column (61) arranged below the end part of the reserved part of the existing steel beam (32) to be broken, and a back-jacking inclined strut (63) arranged between the lowest back-jacking column (61) and the existing upright column (31); the lower end of the back-propping inclined strut (63) is connected with the existing upright post (31) through a plurality of vertical welding lines in a welding way, and the upper end of the back-propping inclined strut is propped against the lowest back-propping upright post (61) through a floor (1) and an existing steel beam (32); the jacking column (61) is provided with a height adjusting base (62) fixedly connected with the jacking column (61), the height adjusting base (62) comprises two horizontal steel plates and a plurality of reading type jacks which are vertically arranged and clamped between the two horizontal steel plates, and the reading type jacks are respectively fixedly connected with the two horizontal steel plates.
7. A construction method for installing a cross-storey batter post in an existing storey according to claim 6, wherein: each reading type jack is an electric remote control jack with a sensor for measuring jacking force, a plurality of reading type jacks in each height adjusting base (62) are electrically connected with a lower computer, and each lower computer is electrically connected with an upper computer.
8. A construction method for installing a cross-storey batter post in an existing storey according to claim 7, wherein: in the second step, the force of the back-jacking column (61) for back jacking is controlled by adopting the following method:
in each jacking column (61), the jacking force required by the jacking column (61) is respectively recorded as F, the number of the reading type jacks in the height adjusting base (62) is recorded as N, and the jacking force which each reading type jack should achieve is F/N;
inputting the values of F and N of each ejection column (61) into an upper computer, and then distributing the F/N value of each ejection column (61) to each lower computer by the upper computer;
when the jack is jacked back, the reading jacks start to jack simultaneously, and when the jacking force of each reading jack reaches the F/N value of the corresponding jack-back column (61), the jack is stopped to jack until all jacks stop.
9. A construction method for installing a cross-storey batter post in an existing storey according to claim 1, wherein: the existing upright columns (31) are arranged at intervals around the periphery of a building, two adjacent existing upright columns (31) are connected into a whole through ring beams (4) with the same installation height as the existing steel beams (32), and after the three-oblique-column subsection (2) is installed, two adjacent oblique columns are connected through the ring beams (4) with the same installation height as the supplemented steel beams installed between the oblique columns.
10. A construction method for installing a cross-storey batter post in an existing storey according to claim 9, wherein: the batter post is a square steel pipe post formed by surrounding four steel plates, and the cross section of the building is rectangular; batter post segmentation (2) at two batter post tops of rectangle four corners position are even as an organic whole before the installation, and note the A post, the difficult steel sheet that aligns of steel sheet note of constituteing the A post, in the four steel sheets of every branch of A post, the breach that is used for conveniently aligning is left to the lower extreme of a steel sheet, A post hoist and mount back in place, align earlier and weld the difficult steel sheet that aligns that does not have the breach, then measure shape and size that difficult alignment steel sheet welding back breach becomes and according to measuring result processing benefit board, pack in the breach and mend the board and with breach border welded connection.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411882A (en) * | 2020-11-27 | 2021-02-26 | 上海宝冶集团有限公司 | Method for building ultrahigh and oversized space inclined cylindrical column |
| CN113833020A (en) * | 2021-09-30 | 2021-12-24 | 中铁四局集团第五工程有限公司 | Construction method of large fish belly type inclined column structure in underground space |
| CN114790757A (en) * | 2022-03-16 | 2022-07-26 | 中铁一局集团(广州)建设工程有限公司 | Cover-excavation top-down construction V-shaped column structure and construction method thereof |
| DE202022103906U1 (en) * | 2022-03-15 | 2022-07-26 | China Construction Second Engineering Bureau Ltd. | Support structure for concreting inclined columns |
| CN114837483A (en) * | 2022-04-29 | 2022-08-02 | 北京建工集团有限责任公司 | High-low span portal steel frame building structure and construction process thereof |
| CN114934542A (en) * | 2022-03-16 | 2022-08-23 | 中铁一局集团(广州)建设工程有限公司 | Stress system conversion construction method for covering and digging top-down V-shaped column |
-
2022
- 2022-12-01 CN CN202211533513.XA patent/CN115637872B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411882A (en) * | 2020-11-27 | 2021-02-26 | 上海宝冶集团有限公司 | Method for building ultrahigh and oversized space inclined cylindrical column |
| CN113833020A (en) * | 2021-09-30 | 2021-12-24 | 中铁四局集团第五工程有限公司 | Construction method of large fish belly type inclined column structure in underground space |
| DE202022103906U1 (en) * | 2022-03-15 | 2022-07-26 | China Construction Second Engineering Bureau Ltd. | Support structure for concreting inclined columns |
| CN114790757A (en) * | 2022-03-16 | 2022-07-26 | 中铁一局集团(广州)建设工程有限公司 | Cover-excavation top-down construction V-shaped column structure and construction method thereof |
| CN114934542A (en) * | 2022-03-16 | 2022-08-23 | 中铁一局集团(广州)建设工程有限公司 | Stress system conversion construction method for covering and digging top-down V-shaped column |
| CN114837483A (en) * | 2022-04-29 | 2022-08-02 | 北京建工集团有限责任公司 | High-low span portal steel frame building structure and construction process thereof |
Non-Patent Citations (3)
| Title |
|---|
| 张进军;谭伟;王文涛;施永芒;: "航天科技广场超长型钢混凝土斜柱设计" * |
| 王世村;: "钢管混凝土斜柱转换结构设计" * |
| 王大愚;仝胜强;朱同然;龚文东;: "国家体育场矩形钢管混凝土柱吊装技术" * |
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